Merge commit 'origin/master' into for-linus/xen/master

* commit 'origin/master': (4825 commits)
  Fix build errors due to CONFIG_BRANCH_TRACER=y
  parport: Use the PCI IRQ if offered
  tty: jsm cleanups
  Adjust path to gpio headers
  KGDB_SERIAL_CONSOLE check for module
  Change KCONFIG name
  tty: Blackin CTS/RTS
  Change hardware flow control from poll to interrupt driven
  Add support for the MAX3100 SPI UART.
  lanana: assign a device name and numbering for MAX3100
  serqt: initial clean up pass for tty side
  tty: Use the generic RS485 ioctl on CRIS
  tty: Correct inline types for tty_driver_kref_get()
  splice: fix deadlock in splicing to file
  nilfs2: support nanosecond timestamp
  nilfs2: introduce secondary super block
  nilfs2: simplify handling of active state of segments
  nilfs2: mark minor flag for checkpoint created by internal operation
  nilfs2: clean up sketch file
  nilfs2: super block operations fix endian bug
  ...

Conflicts:
	arch/x86/include/asm/thread_info.h
	arch/x86/lguest/boot.c
	drivers/xen/manage.c

33 files changed, 4400 insertions, 694 deletions

diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 12dfb44c22e..fbeaec76210 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -296,7 +296,7 @@ int ocfs2_init_acl(handle_t *handle,
 				return PTR_ERR(acl);
 		}
 		if (!acl)
-			inode->i_mode &= ~current->fs->umask;
+			inode->i_mode &= ~current_umask();
 	}
 	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
 		struct posix_acl *clone;
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 19e3a96aa02..678a067d925 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -294,6 +294,55 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
 	.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
 };
 
+static void ocfs2_dx_root_set_last_eb_blk(struct ocfs2_extent_tree *et,
+					  u64 blkno)
+{
+	struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+	dx_root->dr_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_dx_root_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+	struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+	return le64_to_cpu(dx_root->dr_last_eb_blk);
+}
+
+static void ocfs2_dx_root_update_clusters(struct inode *inode,
+					  struct ocfs2_extent_tree *et,
+					  u32 clusters)
+{
+	struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+	le32_add_cpu(&dx_root->dr_clusters, clusters);
+}
+
+static int ocfs2_dx_root_sanity_check(struct inode *inode,
+				      struct ocfs2_extent_tree *et)
+{
+	struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+	BUG_ON(!OCFS2_IS_VALID_DX_ROOT(dx_root));
+
+	return 0;
+}
+
+static void ocfs2_dx_root_fill_root_el(struct ocfs2_extent_tree *et)
+{
+	struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+	et->et_root_el = &dx_root->dr_list;
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_dx_root_et_ops = {
+	.eo_set_last_eb_blk	= ocfs2_dx_root_set_last_eb_blk,
+	.eo_get_last_eb_blk	= ocfs2_dx_root_get_last_eb_blk,
+	.eo_update_clusters	= ocfs2_dx_root_update_clusters,
+	.eo_sanity_check	= ocfs2_dx_root_sanity_check,
+	.eo_fill_root_el	= ocfs2_dx_root_fill_root_el,
+};
+
 static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
 				     struct inode *inode,
 				     struct buffer_head *bh,
@@ -339,6 +388,14 @@ void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
 				 &ocfs2_xattr_value_et_ops);
 }
 
+void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
+				    struct inode *inode,
+				    struct buffer_head *bh)
+{
+	__ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_dr,
+				 NULL, &ocfs2_dx_root_et_ops);
+}
+
 static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
 					    u64 new_last_eb_blk)
 {
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index cceff5c37f4..353254ba29e 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -75,6 +75,9 @@ struct ocfs2_xattr_value_buf;
 void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
 					struct inode *inode,
 					struct ocfs2_xattr_value_buf *vb);
+void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
+				    struct inode *inode,
+				    struct buffer_head *bh);
 
 /*
  * Read an extent block into *bh.  If *bh is NULL, a bh will be
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 8e1709a679b..b2c52b3a148 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1956,15 +1956,16 @@ static int ocfs2_write_end(struct file *file, struct address_space *mapping,
 }
 
 const struct address_space_operations ocfs2_aops = {
-	.readpage	= ocfs2_readpage,
-	.readpages	= ocfs2_readpages,
-	.writepage	= ocfs2_writepage,
-	.write_begin	= ocfs2_write_begin,
-	.write_end	= ocfs2_write_end,
-	.bmap		= ocfs2_bmap,
-	.sync_page	= block_sync_page,
-	.direct_IO	= ocfs2_direct_IO,
-	.invalidatepage	= ocfs2_invalidatepage,
-	.releasepage	= ocfs2_releasepage,
-	.migratepage	= buffer_migrate_page,
+	.readpage		= ocfs2_readpage,
+	.readpages		= ocfs2_readpages,
+	.writepage		= ocfs2_writepage,
+	.write_begin		= ocfs2_write_begin,
+	.write_end		= ocfs2_write_end,
+	.bmap			= ocfs2_bmap,
+	.sync_page		= block_sync_page,
+	.direct_IO		= ocfs2_direct_IO,
+	.invalidatepage		= ocfs2_invalidatepage,
+	.releasepage		= ocfs2_releasepage,
+	.migratepage		= buffer_migrate_page,
+	.is_partially_uptodate	= block_is_partially_uptodate,
 };
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 04697ba7f73..4f85eceab37 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -33,6 +33,7 @@
 #include <linux/random.h>
 #include <linux/crc32.h>
 #include <linux/time.h>
+#include <linux/debugfs.h>
 
 #include "heartbeat.h"
 #include "tcp.h"
@@ -60,6 +61,11 @@ static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
 static LIST_HEAD(o2hb_node_events);
 static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
 
+#define O2HB_DEBUG_DIR			"o2hb"
+#define O2HB_DEBUG_LIVENODES		"livenodes"
+static struct dentry *o2hb_debug_dir;
+static struct dentry *o2hb_debug_livenodes;
+
 static LIST_HEAD(o2hb_all_regions);
 
 static struct o2hb_callback {
@@ -905,7 +911,77 @@ static int o2hb_thread(void *data)
 	return 0;
 }
 
-void o2hb_init(void)
+#ifdef CONFIG_DEBUG_FS
+static int o2hb_debug_open(struct inode *inode, struct file *file)
+{
+	unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+	char *buf = NULL;
+	int i = -1;
+	int out = 0;
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		goto bail;
+
+	o2hb_fill_node_map(map, sizeof(map));
+
+	while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
+		out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+	out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+
+	i_size_write(inode, out);
+
+	file->private_data = buf;
+
+	return 0;
+bail:
+	return -ENOMEM;
+}
+
+static int o2hb_debug_release(struct inode *inode, struct file *file)
+{
+	kfree(file->private_data);
+	return 0;
+}
+
+static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
+				 size_t nbytes, loff_t *ppos)
+{
+	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+				       i_size_read(file->f_mapping->host));
+}
+#else
+static int o2hb_debug_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+static int o2hb_debug_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
+			       size_t nbytes, loff_t *ppos)
+{
+	return 0;
+}
+#endif  /* CONFIG_DEBUG_FS */
+
+static struct file_operations o2hb_debug_fops = {
+	.open =		o2hb_debug_open,
+	.release =	o2hb_debug_release,
+	.read =		o2hb_debug_read,
+	.llseek =	generic_file_llseek,
+};
+
+void o2hb_exit(void)
+{
+	if (o2hb_debug_livenodes)
+		debugfs_remove(o2hb_debug_livenodes);
+	if (o2hb_debug_dir)
+		debugfs_remove(o2hb_debug_dir);
+}
+
+int o2hb_init(void)
 {
 	int i;
 
@@ -918,6 +994,24 @@ void o2hb_init(void)
 	INIT_LIST_HEAD(&o2hb_node_events);
 
 	memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
+
+	o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
+	if (!o2hb_debug_dir) {
+		mlog_errno(-ENOMEM);
+		return -ENOMEM;
+	}
+
+	o2hb_debug_livenodes = debugfs_create_file(O2HB_DEBUG_LIVENODES,
+						   S_IFREG|S_IRUSR,
+						   o2hb_debug_dir, NULL,
+						   &o2hb_debug_fops);
+	if (!o2hb_debug_livenodes) {
+		mlog_errno(-ENOMEM);
+		debugfs_remove(o2hb_debug_dir);
+		return -ENOMEM;
+	}
+
+	return 0;
 }
 
 /* if we're already in a callback then we're already serialized by the sem */
diff --git a/fs/ocfs2/cluster/heartbeat.h b/fs/ocfs2/cluster/heartbeat.h
index e511339886b..2f1649253b4 100644
--- a/fs/ocfs2/cluster/heartbeat.h
+++ b/fs/ocfs2/cluster/heartbeat.h
@@ -75,7 +75,8 @@ void o2hb_unregister_callback(const char *region_uuid,
 			      struct o2hb_callback_func *hc);
 void o2hb_fill_node_map(unsigned long *map,
 			unsigned bytes);
-void o2hb_init(void);
+void o2hb_exit(void);
+int o2hb_init(void);
 int o2hb_check_node_heartbeating(u8 node_num);
 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
 int o2hb_check_local_node_heartbeating(void);
diff --git a/fs/ocfs2/cluster/nodemanager.c b/fs/ocfs2/cluster/nodemanager.c
index 70e8fa9e253..7ee6188bc79 100644
--- a/fs/ocfs2/cluster/nodemanager.c
+++ b/fs/ocfs2/cluster/nodemanager.c
@@ -881,6 +881,7 @@ static void __exit exit_o2nm(void)
 	o2cb_sys_shutdown();
 
 	o2net_exit();
+	o2hb_exit();
 }
 
 static int __init init_o2nm(void)
@@ -889,11 +890,13 @@ static int __init init_o2nm(void)
 
 	cluster_print_version();
 
-	o2hb_init();
+	ret = o2hb_init();
+	if (ret)
+		goto out;
 
 	ret = o2net_init();
 	if (ret)
-		goto out;
+		goto out_o2hb;
 
 	ret = o2net_register_hb_callbacks();
 	if (ret)
@@ -916,6 +919,8 @@ out_callbacks:
 	o2net_unregister_hb_callbacks();
 out_o2net:
 	o2net_exit();
+out_o2hb:
+	o2hb_exit();
 out:
 	return ret;
 }
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index f2c4098cf33..e71160cda11 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -41,6 +41,7 @@
 #include <linux/slab.h>
 #include <linux/highmem.h>
 #include <linux/quotaops.h>
+#include <linux/sort.h>
 
 #define MLOG_MASK_PREFIX ML_NAMEI
 #include <cluster/masklog.h>
@@ -58,6 +59,7 @@
 #include "namei.h"
 #include "suballoc.h"
 #include "super.h"
+#include "sysfile.h"
 #include "uptodate.h"
 
 #include "buffer_head_io.h"
@@ -71,11 +73,6 @@ static unsigned char ocfs2_filetype_table[] = {
 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
 };
 
-static int ocfs2_extend_dir(struct ocfs2_super *osb,
-			    struct inode *dir,
-			    struct buffer_head *parent_fe_bh,
-			    unsigned int blocks_wanted,
-			    struct buffer_head **new_de_bh);
 static int ocfs2_do_extend_dir(struct super_block *sb,
 			       handle_t *handle,
 			       struct inode *dir,
@@ -83,22 +80,36 @@ static int ocfs2_do_extend_dir(struct super_block *sb,
 			       struct ocfs2_alloc_context *data_ac,
 			       struct ocfs2_alloc_context *meta_ac,
 			       struct buffer_head **new_bh);
+static int ocfs2_dir_indexed(struct inode *inode);
 
 /*
  * These are distinct checks because future versions of the file system will
  * want to have a trailing dirent structure independent of indexing.
  */
-static int ocfs2_dir_has_trailer(struct inode *dir)
+static int ocfs2_supports_dir_trailer(struct inode *dir)
 {
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+
 	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 		return 0;
 
-	return ocfs2_meta_ecc(OCFS2_SB(dir->i_sb));
+	return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir);
 }
 
-static int ocfs2_supports_dir_trailer(struct ocfs2_super *osb)
+/*
+ * "new' here refers to the point at which we're creating a new
+ * directory via "mkdir()", but also when we're expanding an inline
+ * directory. In either case, we don't yet have the indexing bit set
+ * on the directory, so the standard checks will fail in when metaecc
+ * is turned off. Only directory-initialization type functions should
+ * use this then. Everything else wants ocfs2_supports_dir_trailer()
+ */
+static int ocfs2_new_dir_wants_trailer(struct inode *dir)
 {
-	return ocfs2_meta_ecc(osb);
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+
+	return ocfs2_meta_ecc(osb) ||
+		ocfs2_supports_indexed_dirs(osb);
 }
 
 static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
@@ -130,7 +141,7 @@ static int ocfs2_skip_dir_trailer(struct inode *dir,
 {
 	unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer);
 
-	if (!ocfs2_dir_has_trailer(dir))
+	if (!ocfs2_supports_dir_trailer(dir))
 		return 0;
 
 	if (offset != toff)
@@ -140,7 +151,7 @@ static int ocfs2_skip_dir_trailer(struct inode *dir,
 }
 
 static void ocfs2_init_dir_trailer(struct inode *inode,
-				   struct buffer_head *bh)
+				   struct buffer_head *bh, u16 rec_len)
 {
 	struct ocfs2_dir_block_trailer *trailer;
 
@@ -150,6 +161,153 @@ static void ocfs2_init_dir_trailer(struct inode *inode,
 			cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer));
 	trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 	trailer->db_blkno = cpu_to_le64(bh->b_blocknr);
+	trailer->db_free_rec_len = cpu_to_le16(rec_len);
+}
+/*
+ * Link an unindexed block with a dir trailer structure into the index free
+ * list. This function will modify dirdata_bh, but assumes you've already
+ * passed it to the journal.
+ */
+static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle,
+				     struct buffer_head *dx_root_bh,
+				     struct buffer_head *dirdata_bh)
+{
+	int ret;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dir_block_trailer *trailer;
+
+	ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+
+	trailer->db_free_next = dx_root->dr_free_blk;
+	dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
+
+	ocfs2_journal_dirty(handle, dx_root_bh);
+
+out:
+	return ret;
+}
+
+static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res)
+{
+	return res->dl_prev_leaf_bh == NULL;
+}
+
+void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res)
+{
+	brelse(res->dl_dx_root_bh);
+	brelse(res->dl_leaf_bh);
+	brelse(res->dl_dx_leaf_bh);
+	brelse(res->dl_prev_leaf_bh);
+}
+
+static int ocfs2_dir_indexed(struct inode *inode)
+{
+	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL)
+		return 1;
+	return 0;
+}
+
+static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root)
+{
+	return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE;
+}
+
+/*
+ * Hashing code adapted from ext3
+ */
+#define DELTA 0x9E3779B9
+
+static void TEA_transform(__u32 buf[4], __u32 const in[])
+{
+	__u32	sum = 0;
+	__u32	b0 = buf[0], b1 = buf[1];
+	__u32	a = in[0], b = in[1], c = in[2], d = in[3];
+	int	n = 16;
+
+	do {
+		sum += DELTA;
+		b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
+		b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
+	} while (--n);
+
+	buf[0] += b0;
+	buf[1] += b1;
+}
+
+static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
+{
+	__u32	pad, val;
+	int	i;
+
+	pad = (__u32)len | ((__u32)len << 8);
+	pad |= pad << 16;
+
+	val = pad;
+	if (len > num*4)
+		len = num * 4;
+	for (i = 0; i < len; i++) {
+		if ((i % 4) == 0)
+			val = pad;
+		val = msg[i] + (val << 8);
+		if ((i % 4) == 3) {
+			*buf++ = val;
+			val = pad;
+			num--;
+		}
+	}
+	if (--num >= 0)
+		*buf++ = val;
+	while (--num >= 0)
+		*buf++ = pad;
+}
+
+static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len,
+				   struct ocfs2_dx_hinfo *hinfo)
+{
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	const char	*p;
+	__u32		in[8], buf[4];
+
+	/*
+	 * XXX: Is this really necessary, if the index is never looked
+	 * at by readdir? Is a hash value of '0' a bad idea?
+	 */
+	if ((len == 1 && !strncmp(".", name, 1)) ||
+	    (len == 2 && !strncmp("..", name, 2))) {
+		buf[0] = buf[1] = 0;
+		goto out;
+	}
+
+#ifdef OCFS2_DEBUG_DX_DIRS
+	/*
+	 * This makes it very easy to debug indexing problems. We
+	 * should never allow this to be selected without hand editing
+	 * this file though.
+	 */
+	buf[0] = buf[1] = len;
+	goto out;
+#endif
+
+	memcpy(buf, osb->osb_dx_seed, sizeof(buf));
+
+	p = name;
+	while (len > 0) {
+		str2hashbuf(p, len, in, 4);
+		TEA_transform(buf, in);
+		len -= 16;
+		p += 16;
+	}
+
+out:
+	hinfo->major_hash = buf[0];
+	hinfo->minor_hash = buf[1];
 }
 
 /*
@@ -312,6 +470,52 @@ static int ocfs2_validate_dir_block(struct super_block *sb,
 }
 
 /*
+ * Validate a directory trailer.
+ *
+ * We check the trailer here rather than in ocfs2_validate_dir_block()
+ * because that function doesn't have the inode to test.
+ */
+static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh)
+{
+	int rc = 0;
+	struct ocfs2_dir_block_trailer *trailer;
+
+	trailer = ocfs2_trailer_from_bh(bh, dir->i_sb);
+	if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
+		rc = -EINVAL;
+		ocfs2_error(dir->i_sb,
+			    "Invalid dirblock #%llu: "
+			    "signature = %.*s\n",
+			    (unsigned long long)bh->b_blocknr, 7,
+			    trailer->db_signature);
+		goto out;
+	}
+	if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) {
+		rc = -EINVAL;
+		ocfs2_error(dir->i_sb,
+			    "Directory block #%llu has an invalid "
+			    "db_blkno of %llu",
+			    (unsigned long long)bh->b_blocknr,
+			    (unsigned long long)le64_to_cpu(trailer->db_blkno));
+		goto out;
+	}
+	if (le64_to_cpu(trailer->db_parent_dinode) !=
+	    OCFS2_I(dir)->ip_blkno) {
+		rc = -EINVAL;
+		ocfs2_error(dir->i_sb,
+			    "Directory block #%llu on dinode "
+			    "#%llu has an invalid parent_dinode "
+			    "of %llu",
+			    (unsigned long long)bh->b_blocknr,
+			    (unsigned long long)OCFS2_I(dir)->ip_blkno,
+			    (unsigned long long)le64_to_cpu(trailer->db_blkno));
+		goto out;
+	}
+out:
+	return rc;
+}
+
+/*
  * This function forces all errors to -EIO for consistency with its
  * predecessor, ocfs2_bread().  We haven't audited what returning the
  * real error codes would do to callers.  We log the real codes with
@@ -322,7 +526,6 @@ static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
 {
 	int rc = 0;
 	struct buffer_head *tmp = *bh;
-	struct ocfs2_dir_block_trailer *trailer;
 
 	rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
 				    ocfs2_validate_dir_block);
@@ -331,42 +534,13 @@ static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
 		goto out;
 	}
 
-	/*
-	 * We check the trailer here rather than in
-	 * ocfs2_validate_dir_block() because that function doesn't have
-	 * the inode to test.
-	 */
 	if (!(flags & OCFS2_BH_READAHEAD) &&
-	    ocfs2_dir_has_trailer(inode)) {
-		trailer = ocfs2_trailer_from_bh(tmp, inode->i_sb);
-		if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
-			rc = -EINVAL;
-			ocfs2_error(inode->i_sb,
-				    "Invalid dirblock #%llu: "
-				    "signature = %.*s\n",
-				    (unsigned long long)tmp->b_blocknr, 7,
-				    trailer->db_signature);
-			goto out;
-		}
-		if (le64_to_cpu(trailer->db_blkno) != tmp->b_blocknr) {
-			rc = -EINVAL;
-			ocfs2_error(inode->i_sb,
-				    "Directory block #%llu has an invalid "
-				    "db_blkno of %llu",
-				    (unsigned long long)tmp->b_blocknr,
-				    (unsigned long long)le64_to_cpu(trailer->db_blkno));
-			goto out;
-		}
-		if (le64_to_cpu(trailer->db_parent_dinode) !=
-		    OCFS2_I(inode)->ip_blkno) {
-			rc = -EINVAL;
-			ocfs2_error(inode->i_sb,
-				    "Directory block #%llu on dinode "
-				    "#%llu has an invalid parent_dinode "
-				    "of %llu",
-				    (unsigned long long)tmp->b_blocknr,
-				    (unsigned long long)OCFS2_I(inode)->ip_blkno,
-				    (unsigned long long)le64_to_cpu(trailer->db_blkno));
+	    ocfs2_supports_dir_trailer(inode)) {
+		rc = ocfs2_check_dir_trailer(inode, tmp);
+		if (rc) {
+			if (!*bh)
+				brelse(tmp);
+			mlog_errno(rc);
 			goto out;
 		}
 	}
@@ -379,6 +553,141 @@ out:
 	return rc ? -EIO : 0;
 }
 
+/*
+ * Read the block at 'phys' which belongs to this directory
+ * inode. This function does no virtual->physical block translation -
+ * what's passed in is assumed to be a valid directory block.
+ */
+static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys,
+				       struct buffer_head **bh)
+{
+	int ret;
+	struct buffer_head *tmp = *bh;
+
+	ret = ocfs2_read_block(dir, phys, &tmp, ocfs2_validate_dir_block);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (ocfs2_supports_dir_trailer(dir)) {
+		ret = ocfs2_check_dir_trailer(dir, tmp);
+		if (ret) {
+			if (!*bh)
+				brelse(tmp);
+			mlog_errno(ret);
+			goto out;
+		}
+	}
+
+	if (!ret && !*bh)
+		*bh = tmp;
+out:
+	return ret;
+}
+
+static int ocfs2_validate_dx_root(struct super_block *sb,
+				  struct buffer_head *bh)
+{
+	int ret;
+	struct ocfs2_dx_root_block *dx_root;
+
+	BUG_ON(!buffer_uptodate(bh));
+
+	dx_root = (struct ocfs2_dx_root_block *) bh->b_data;
+
+	ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check);
+	if (ret) {
+		mlog(ML_ERROR,
+		     "Checksum failed for dir index root block %llu\n",
+		     (unsigned long long)bh->b_blocknr);
+		return ret;
+	}
+
+	if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) {
+		ocfs2_error(sb,
+			    "Dir Index Root # %llu has bad signature %.*s",
+			    (unsigned long long)le64_to_cpu(dx_root->dr_blkno),
+			    7, dx_root->dr_signature);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di,
+			      struct buffer_head **dx_root_bh)
+{
+	int ret;
+	u64 blkno = le64_to_cpu(di->i_dx_root);
+	struct buffer_head *tmp = *dx_root_bh;
+
+	ret = ocfs2_read_block(dir, blkno, &tmp, ocfs2_validate_dx_root);
+
+	/* If ocfs2_read_block() got us a new bh, pass it up. */
+	if (!ret && !*dx_root_bh)
+		*dx_root_bh = tmp;
+
+	return ret;
+}
+
+static int ocfs2_validate_dx_leaf(struct super_block *sb,
+				  struct buffer_head *bh)
+{
+	int ret;
+	struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data;
+
+	BUG_ON(!buffer_uptodate(bh));
+
+	ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check);
+	if (ret) {
+		mlog(ML_ERROR,
+		     "Checksum failed for dir index leaf block %llu\n",
+		     (unsigned long long)bh->b_blocknr);
+		return ret;
+	}
+
+	if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) {
+		ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s",
+			    7, dx_leaf->dl_signature);
+		return -EROFS;
+	}
+
+	return 0;
+}
+
+static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno,
+			      struct buffer_head **dx_leaf_bh)
+{
+	int ret;
+	struct buffer_head *tmp = *dx_leaf_bh;
+
+	ret = ocfs2_read_block(dir, blkno, &tmp, ocfs2_validate_dx_leaf);
+
+	/* If ocfs2_read_block() got us a new bh, pass it up. */
+	if (!ret && !*dx_leaf_bh)
+		*dx_leaf_bh = tmp;
+
+	return ret;
+}
+
+/*
+ * Read a series of dx_leaf blocks. This expects all buffer_head
+ * pointers to be NULL on function entry.
+ */
+static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num,
+				struct buffer_head **dx_leaf_bhs)
+{
+	int ret;
+
+	ret = ocfs2_read_blocks(dir, start, num, dx_leaf_bhs, 0,
+				ocfs2_validate_dx_leaf);
+	if (ret)
+		mlog_errno(ret);
+
+	return ret;
+}
+
 static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
 					       struct inode *dir,
 					       struct ocfs2_dir_entry **res_dir)
@@ -480,39 +789,340 @@ cleanup_and_exit:
 	return ret;
 }
 
+static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
+				   struct ocfs2_extent_list *el,
+				   u32 major_hash,
+				   u32 *ret_cpos,
+				   u64 *ret_phys_blkno,
+				   unsigned int *ret_clen)
+{
+	int ret = 0, i, found;
+	struct buffer_head *eb_bh = NULL;
+	struct ocfs2_extent_block *eb;
+	struct ocfs2_extent_rec *rec = NULL;
+
+	if (el->l_tree_depth) {
+		ret = ocfs2_find_leaf(inode, el, major_hash, &eb_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+		el = &eb->h_list;
+
+		if (el->l_tree_depth) {
+			ocfs2_error(inode->i_sb,
+				    "Inode %lu has non zero tree depth in "
+				    "btree tree block %llu\n", inode->i_ino,
+				    (unsigned long long)eb_bh->b_blocknr);
+			ret = -EROFS;
+			goto out;
+		}
+	}
+
+	found = 0;
+	for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
+		rec = &el->l_recs[i];
+
+		if (le32_to_cpu(rec->e_cpos) <= major_hash) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found) {
+		ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
+			    "record (%u, %u, 0) in btree", inode->i_ino,
+			    le32_to_cpu(rec->e_cpos),
+			    ocfs2_rec_clusters(el, rec));
+		ret = -EROFS;
+		goto out;
+	}
+
+	if (ret_phys_blkno)
+		*ret_phys_blkno = le64_to_cpu(rec->e_blkno);
+	if (ret_cpos)
+		*ret_cpos = le32_to_cpu(rec->e_cpos);
+	if (ret_clen)
+		*ret_clen = le16_to_cpu(rec->e_leaf_clusters);
+
+out:
+	brelse(eb_bh);
+	return ret;
+}
+
+/*
+ * Returns the block index, from the start of the cluster which this
+ * hash belongs too.
+ */
+static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
+						   u32 minor_hash)
+{
+	return minor_hash & osb->osb_dx_mask;
+}
+
+static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
+					  struct ocfs2_dx_hinfo *hinfo)
+{
+	return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash);
+}
+
+static int ocfs2_dx_dir_lookup(struct inode *inode,
+			       struct ocfs2_extent_list *el,
+			       struct ocfs2_dx_hinfo *hinfo,
+			       u32 *ret_cpos,
+			       u64 *ret_phys_blkno)
+{
+	int ret = 0;
+	unsigned int cend, uninitialized_var(clen);
+	u32 uninitialized_var(cpos);
+	u64 uninitialized_var(blkno);
+	u32 name_hash = hinfo->major_hash;
+
+	ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno,
+				      &clen);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	cend = cpos + clen;
+	if (name_hash >= cend) {
+		/* We want the last cluster */
+		blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1);
+		cpos += clen - 1;
+	} else {
+		blkno += ocfs2_clusters_to_blocks(inode->i_sb,
+						  name_hash - cpos);
+		cpos = name_hash;
+	}
+
+	/*
+	 * We now have the cluster which should hold our entry. To
+	 * find the exact block from the start of the cluster to
+	 * search, we take the lower bits of the hash.
+	 */
+	blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo);
+
+	if (ret_phys_blkno)
+		*ret_phys_blkno = blkno;
+	if (ret_cpos)
+		*ret_cpos = cpos;
+
+out:
+
+	return ret;
+}
+
+static int ocfs2_dx_dir_search(const char *name, int namelen,
+			       struct inode *dir,
+			       struct ocfs2_dx_root_block *dx_root,
+			       struct ocfs2_dir_lookup_result *res)
+{
+	int ret, i, found;
+	u64 uninitialized_var(phys);
+	struct buffer_head *dx_leaf_bh = NULL;
+	struct ocfs2_dx_leaf *dx_leaf;
+	struct ocfs2_dx_entry *dx_entry = NULL;
+	struct buffer_head *dir_ent_bh = NULL;
+	struct ocfs2_dir_entry *dir_ent = NULL;
+	struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo;
+	struct ocfs2_extent_list *dr_el;
+	struct ocfs2_dx_entry_list *entry_list;
+
+	ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo);
+
+	if (ocfs2_dx_root_inline(dx_root)) {
+		entry_list = &dx_root->dr_entries;
+		goto search;
+	}
+
+	dr_el = &dx_root->dr_list;
+
+	ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	mlog(0, "Dir %llu: name: \"%.*s\", lookup of hash: %u.0x%x "
+	     "returns: %llu\n",
+	     (unsigned long long)OCFS2_I(dir)->ip_blkno,
+	     namelen, name, hinfo->major_hash, hinfo->minor_hash,
+	     (unsigned long long)phys);
+
+	ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data;
+
+	mlog(0, "leaf info: num_used: %d, count: %d\n",
+	     le16_to_cpu(dx_leaf->dl_list.de_num_used),
+	     le16_to_cpu(dx_leaf->dl_list.de_count));
+
+	entry_list = &dx_leaf->dl_list;
+
+search:
+	/*
+	 * Empty leaf is legal, so no need to check for that.
+	 */
+	found = 0;
+	for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
+		dx_entry = &entry_list->de_entries[i];
+
+		if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash)
+		    || hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash))
+			continue;
+
+		/*
+		 * Search unindexed leaf block now. We're not
+		 * guaranteed to find anything.
+		 */
+		ret = ocfs2_read_dir_block_direct(dir,
+					  le64_to_cpu(dx_entry->dx_dirent_blk),
+					  &dir_ent_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		/*
+		 * XXX: We should check the unindexed block here,
+		 * before using it.
+		 */
+
+		found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen,
+					      0, dir_ent_bh->b_data,
+					      dir->i_sb->s_blocksize, &dir_ent);
+		if (found == 1)
+			break;
+
+		if (found == -1) {
+			/* This means we found a bad directory entry. */
+			ret = -EIO;
+			mlog_errno(ret);
+			goto out;
+		}
+
+		brelse(dir_ent_bh);
+		dir_ent_bh = NULL;
+	}
+
+	if (found <= 0) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	res->dl_leaf_bh = dir_ent_bh;
+	res->dl_entry = dir_ent;
+	res->dl_dx_leaf_bh = dx_leaf_bh;
+	res->dl_dx_entry = dx_entry;
+
+	ret = 0;
+out:
+	if (ret) {
+		brelse(dx_leaf_bh);
+		brelse(dir_ent_bh);
+	}
+	return ret;
+}
+
+static int ocfs2_find_entry_dx(const char *name, int namelen,
+			       struct inode *dir,
+			       struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret;
+	struct buffer_head *di_bh = NULL;
+	struct ocfs2_dinode *di;
+	struct buffer_head *dx_root_bh = NULL;
+	struct ocfs2_dx_root_block *dx_root;
+
+	ret = ocfs2_read_inode_block(dir, &di_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	di = (struct ocfs2_dinode *)di_bh->b_data;
+
+	ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
+
+	ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup);
+	if (ret) {
+		if (ret != -ENOENT)
+			mlog_errno(ret);
+		goto out;
+	}
+
+	lookup->dl_dx_root_bh = dx_root_bh;
+	dx_root_bh = NULL;
+out:
+	brelse(di_bh);
+	brelse(dx_root_bh);
+	return ret;
+}
+
 /*
  * Try to find an entry of the provided name within 'dir'.
  *
- * If nothing was found, NULL is returned. Otherwise, a buffer_head
- * and pointer to the dir entry are passed back.
+ * If nothing was found, -ENOENT is returned. Otherwise, zero is
+ * returned and the struct 'res' will contain information useful to
+ * other directory manipulation functions.
  *
  * Caller can NOT assume anything about the contents of the
- * buffer_head - it is passed back only so that it can be passed into
- * any one of the manipulation functions (add entry, delete entry,
- * etc). As an example, bh in the extent directory case is a data
- * block, in the inline-data case it actually points to an inode.
+ * buffer_heads - they are passed back only so that it can be passed
+ * into any one of the manipulation functions (add entry, delete
+ * entry, etc). As an example, bh in the extent directory case is a
+ * data block, in the inline-data case it actually points to an inode,
+ * in the indexed directory case, multiple buffers are involved.
  */
-struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
-				     struct inode *dir,
-				     struct ocfs2_dir_entry **res_dir)
+int ocfs2_find_entry(const char *name, int namelen,
+		     struct inode *dir, struct ocfs2_dir_lookup_result *lookup)
 {
-	*res_dir = NULL;
+	struct buffer_head *bh;
+	struct ocfs2_dir_entry *res_dir = NULL;
 
+	if (ocfs2_dir_indexed(dir))
+		return ocfs2_find_entry_dx(name, namelen, dir, lookup);
+
+	/*
+	 * The unindexed dir code only uses part of the lookup
+	 * structure, so there's no reason to push it down further
+	 * than this.
+	 */
 	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
-		return ocfs2_find_entry_id(name, namelen, dir, res_dir);
+		bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir);
+	else
+		bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir);
+
+	if (bh == NULL)
+		return -ENOENT;
 
-	return ocfs2_find_entry_el(name, namelen, dir, res_dir);
+	lookup->dl_leaf_bh = bh;
+	lookup->dl_entry = res_dir;
+	return 0;
 }
 
 /*
  * Update inode number and type of a previously found directory entry.
  */
 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
-		       struct buffer_head *de_bh, struct ocfs2_dir_entry *de,
+		       struct ocfs2_dir_lookup_result *res,
 		       struct inode *new_entry_inode)
 {
 	int ret;
 	ocfs2_journal_access_func access = ocfs2_journal_access_db;
+	struct ocfs2_dir_entry *de = res->dl_entry;
+	struct buffer_head *de_bh = res->dl_leaf_bh;
 
 	/*
 	 * The same code works fine for both inline-data and extent
@@ -538,6 +1148,10 @@ out:
 	return ret;
 }
 
+/*
+ * __ocfs2_delete_entry deletes a directory entry by merging it with the
+ * previous entry
+ */
 static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
 				struct ocfs2_dir_entry *de_del,
 				struct buffer_head *bh, char *first_de,
@@ -587,6 +1201,181 @@ bail:
 	return status;
 }
 
+static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de)
+{
+	unsigned int hole;
+
+	if (le64_to_cpu(de->inode) == 0)
+		hole = le16_to_cpu(de->rec_len);
+	else
+		hole = le16_to_cpu(de->rec_len) -
+			OCFS2_DIR_REC_LEN(de->name_len);
+
+	return hole;
+}
+
+static int ocfs2_find_max_rec_len(struct super_block *sb,
+				  struct buffer_head *dirblock_bh)
+{
+	int size, this_hole, largest_hole = 0;
+	char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data;
+	struct ocfs2_dir_entry *de;
+
+	trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb);
+	size = ocfs2_dir_trailer_blk_off(sb);
+	limit = start + size;
+	de_buf = start;
+	de = (struct ocfs2_dir_entry *)de_buf;
+	do {
+		if (de_buf != trailer) {
+			this_hole = ocfs2_figure_dirent_hole(de);
+			if (this_hole > largest_hole)
+				largest_hole = this_hole;
+		}
+
+		de_buf += le16_to_cpu(de->rec_len);
+		de = (struct ocfs2_dir_entry *)de_buf;
+	} while (de_buf < limit);
+
+	if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
+		return largest_hole;
+	return 0;
+}
+
+static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list,
+				       int index)
+{
+	int num_used = le16_to_cpu(entry_list->de_num_used);
+
+	if (num_used == 1 || index == (num_used - 1))
+		goto clear;
+
+	memmove(&entry_list->de_entries[index],
+		&entry_list->de_entries[index + 1],
+		(num_used - index - 1)*sizeof(struct ocfs2_dx_entry));
+clear:
+	num_used--;
+	memset(&entry_list->de_entries[num_used], 0,
+	       sizeof(struct ocfs2_dx_entry));
+	entry_list->de_num_used = cpu_to_le16(num_used);
+}
+
+static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
+				 struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret, index, max_rec_len, add_to_free_list = 0;
+	struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
+	struct buffer_head *leaf_bh = lookup->dl_leaf_bh;
+	struct ocfs2_dx_leaf *dx_leaf;
+	struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry;
+	struct ocfs2_dir_block_trailer *trailer;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dx_entry_list *entry_list;
+
+	/*
+	 * This function gets a bit messy because we might have to
+	 * modify the root block, regardless of whether the indexed
+	 * entries are stored inline.
+	 */
+
+	/*
+	 * *Only* set 'entry_list' here, based on where we're looking
+	 * for the indexed entries. Later, we might still want to
+	 * journal both blocks, based on free list state.
+	 */
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	if (ocfs2_dx_root_inline(dx_root)) {
+		entry_list = &dx_root->dr_entries;
+	} else {
+		dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data;
+		entry_list = &dx_leaf->dl_list;
+	}
+
+	/* Neither of these are a disk corruption - that should have
+	 * been caught by lookup, before we got here. */
+	BUG_ON(le16_to_cpu(entry_list->de_count) <= 0);
+	BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0);
+
+	index = (char *)dx_entry - (char *)entry_list->de_entries;
+	index /= sizeof(*dx_entry);
+
+	if (index >= le16_to_cpu(entry_list->de_num_used)) {
+		mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n",
+		     (unsigned long long)OCFS2_I(dir)->ip_blkno, index,
+		     entry_list, dx_entry);
+		return -EIO;
+	}
+
+	/*
+	 * We know that removal of this dirent will leave enough room
+	 * for a new one, so add this block to the free list if it
+	 * isn't already there.
+	 */
+	trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
+	if (trailer->db_free_rec_len == 0)
+		add_to_free_list = 1;
+
+	/*
+	 * Add the block holding our index into the journal before
+	 * removing the unindexed entry. If we get an error return
+	 * from __ocfs2_delete_entry(), then it hasn't removed the
+	 * entry yet. Likewise, successful return means we *must*
+	 * remove the indexed entry.
+	 *
+	 * We're also careful to journal the root tree block here as
+	 * the entry count needs to be updated. Also, we might be
+	 * adding to the start of the free list.
+	 */
+	ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (!ocfs2_dx_root_inline(dx_root)) {
+		ret = ocfs2_journal_access_dl(handle, dir,
+					      lookup->dl_dx_leaf_bh,
+					      OCFS2_JOURNAL_ACCESS_WRITE);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+	}
+
+	mlog(0, "Dir %llu: delete entry at index: %d\n",
+	     (unsigned long long)OCFS2_I(dir)->ip_blkno, index);
+
+	ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry,
+				   leaf_bh, leaf_bh->b_data, leaf_bh->b_size);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh);
+	trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
+	if (add_to_free_list) {
+		trailer->db_free_next = dx_root->dr_free_blk;
+		dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr);
+		ocfs2_journal_dirty(handle, dx_root_bh);
+	}
+
+	/* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */
+	ocfs2_journal_dirty(handle, leaf_bh);
+
+	le32_add_cpu(&dx_root->dr_num_entries, -1);
+	ocfs2_journal_dirty(handle, dx_root_bh);
+
+	ocfs2_dx_list_remove_entry(entry_list, index);
+
+	if (!ocfs2_dx_root_inline(dx_root))
+		ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh);
+
+out:
+	return ret;
+}
+
 static inline int ocfs2_delete_entry_id(handle_t *handle,
 					struct inode *dir,
 					struct ocfs2_dir_entry *de_del,
@@ -624,18 +1413,22 @@ static inline int ocfs2_delete_entry_el(handle_t *handle,
 }
 
 /*
- * ocfs2_delete_entry deletes a directory entry by merging it with the
- * previous entry
+ * Delete a directory entry. Hide the details of directory
+ * implementation from the caller.
  */
 int ocfs2_delete_entry(handle_t *handle,
 		       struct inode *dir,
-		       struct ocfs2_dir_entry *de_del,
-		       struct buffer_head *bh)
+		       struct ocfs2_dir_lookup_result *res)
 {
+	if (ocfs2_dir_indexed(dir))
+		return ocfs2_delete_entry_dx(handle, dir, res);
+
 	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
-		return ocfs2_delete_entry_id(handle, dir, de_del, bh);
+		return ocfs2_delete_entry_id(handle, dir, res->dl_entry,
+					     res->dl_leaf_bh);
 
-	return ocfs2_delete_entry_el(handle, dir, de_del, bh);
+	return ocfs2_delete_entry_el(handle, dir, res->dl_entry,
+				     res->dl_leaf_bh);
 }
 
 /*
@@ -663,18 +1456,166 @@ static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
 	return 0;
 }
 
+static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf,
+					  struct ocfs2_dx_entry *dx_new_entry)
+{
+	int i;
+
+	i = le16_to_cpu(dx_leaf->dl_list.de_num_used);
+	dx_leaf->dl_list.de_entries[i] = *dx_new_entry;
+
+	le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1);
+}
+
+static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list,
+				       struct ocfs2_dx_hinfo *hinfo,
+				       u64 dirent_blk)
+{
+	int i;
+	struct ocfs2_dx_entry *dx_entry;
+
+	i = le16_to_cpu(entry_list->de_num_used);
+	dx_entry = &entry_list->de_entries[i];
+
+	memset(dx_entry, 0, sizeof(*dx_entry));
+	dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash);
+	dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash);
+	dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk);
+
+	le16_add_cpu(&entry_list->de_num_used, 1);
+}
+
+static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
+				      struct ocfs2_dx_hinfo *hinfo,
+				      u64 dirent_blk,
+				      struct buffer_head *dx_leaf_bh)
+{
+	int ret;
+	struct ocfs2_dx_leaf *dx_leaf;
+
+	ret = ocfs2_journal_access_dl(handle, dir, dx_leaf_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
+	ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk);
+	ocfs2_journal_dirty(handle, dx_leaf_bh);
+
+out:
+	return ret;
+}
+
+static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle,
+					struct ocfs2_dx_hinfo *hinfo,
+					u64 dirent_blk,
+					struct ocfs2_dx_root_block *dx_root)
+{
+	ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk);
+}
+
+static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle,
+			       struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret = 0;
+	struct ocfs2_dx_root_block *dx_root;
+	struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
+
+	ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data;
+	if (ocfs2_dx_root_inline(dx_root)) {
+		ocfs2_dx_inline_root_insert(dir, handle,
+					    &lookup->dl_hinfo,
+					    lookup->dl_leaf_bh->b_blocknr,
+					    dx_root);
+	} else {
+		ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo,
+						 lookup->dl_leaf_bh->b_blocknr,
+						 lookup->dl_dx_leaf_bh);
+		if (ret)
+			goto out;
+	}
+
+	le32_add_cpu(&dx_root->dr_num_entries, 1);
+	ocfs2_journal_dirty(handle, dx_root_bh);
+
+out:
+	return ret;
+}
+
+static void ocfs2_remove_block_from_free_list(struct inode *dir,
+				       handle_t *handle,
+				       struct ocfs2_dir_lookup_result *lookup)
+{
+	struct ocfs2_dir_block_trailer *trailer, *prev;
+	struct ocfs2_dx_root_block *dx_root;
+	struct buffer_head *bh;
+
+	trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
+
+	if (ocfs2_free_list_at_root(lookup)) {
+		bh = lookup->dl_dx_root_bh;
+		dx_root = (struct ocfs2_dx_root_block *)bh->b_data;
+		dx_root->dr_free_blk = trailer->db_free_next;
+	} else {
+		bh = lookup->dl_prev_leaf_bh;
+		prev = ocfs2_trailer_from_bh(bh, dir->i_sb);
+		prev->db_free_next = trailer->db_free_next;
+	}
+
+	trailer->db_free_rec_len = cpu_to_le16(0);
+	trailer->db_free_next = cpu_to_le64(0);
+
+	ocfs2_journal_dirty(handle, bh);
+	ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
+}
+
+/*
+ * This expects that a journal write has been reserved on
+ * lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh
+ */
+static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle,
+				   struct ocfs2_dir_lookup_result *lookup)
+{
+	int max_rec_len;
+	struct ocfs2_dir_block_trailer *trailer;
+
+	/* Walk dl_leaf_bh to figure out what the new free rec_len is. */
+	max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh);
+	if (max_rec_len) {
+		/*
+		 * There's still room in this block, so no need to remove it
+		 * from the free list. In this case, we just want to update
+		 * the rec len accounting.
+		 */
+		trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
+		trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
+		ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
+	} else {
+		ocfs2_remove_block_from_free_list(dir, handle, lookup);
+	}
+}
+
 /* we don't always have a dentry for what we want to add, so people
  * like orphan dir can call this instead.
  *
- * If you pass me insert_bh, I'll skip the search of the other dir
- * blocks and put the record in there.
+ * The lookup context must have been filled from
+ * ocfs2_prepare_dir_for_insert.
  */
 int __ocfs2_add_entry(handle_t *handle,
 		      struct inode *dir,
 		      const char *name, int namelen,
 		      struct inode *inode, u64 blkno,
 		      struct buffer_head *parent_fe_bh,
-		      struct buffer_head *insert_bh)
+		      struct ocfs2_dir_lookup_result *lookup)
 {
 	unsigned long offset;
 	unsigned short rec_len;
@@ -683,6 +1624,7 @@ int __ocfs2_add_entry(handle_t *handle,
 	struct super_block *sb = dir->i_sb;
 	int retval, status;
 	unsigned int size = sb->s_blocksize;
+	struct buffer_head *insert_bh = lookup->dl_leaf_bh;
 	char *data_start = insert_bh->b_data;
 
 	mlog_entry_void();
@@ -690,7 +1632,31 @@ int __ocfs2_add_entry(handle_t *handle,
 	if (!namelen)
 		return -EINVAL;
 
-	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+	if (ocfs2_dir_indexed(dir)) {
+		struct buffer_head *bh;
+
+		/*
+		 * An indexed dir may require that we update the free space
+		 * list. Reserve a write to the previous node in the list so
+		 * that we don't fail later.
+		 *
+		 * XXX: This can be either a dx_root_block, or an unindexed
+		 * directory tree leaf block.
+		 */
+		if (ocfs2_free_list_at_root(lookup)) {
+			bh = lookup->dl_dx_root_bh;
+			retval = ocfs2_journal_access_dr(handle, dir, bh,
+						 OCFS2_JOURNAL_ACCESS_WRITE);
+		} else {
+			bh = lookup->dl_prev_leaf_bh;
+			retval = ocfs2_journal_access_db(handle, dir, bh,
+						 OCFS2_JOURNAL_ACCESS_WRITE);
+		}
+		if (retval) {
+			mlog_errno(retval);
+			return retval;
+		}
+	} else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 		data_start = di->id2.i_data.id_data;
 		size = i_size_read(dir);
 
@@ -737,10 +1703,22 @@ int __ocfs2_add_entry(handle_t *handle,
 				status = ocfs2_journal_access_di(handle, dir,
 								 insert_bh,
 								 OCFS2_JOURNAL_ACCESS_WRITE);
-			else
+			else {
 				status = ocfs2_journal_access_db(handle, dir,
 								 insert_bh,
-								 OCFS2_JOURNAL_ACCESS_WRITE);
+					      OCFS2_JOURNAL_ACCESS_WRITE);
+
+				if (ocfs2_dir_indexed(dir)) {
+					status = ocfs2_dx_dir_insert(dir,
+								handle,
+								lookup);
+					if (status) {
+						mlog_errno(status);
+						goto bail;
+					}
+				}
+			}
+
 			/* By now the buffer is marked for journaling */
 			offset += le16_to_cpu(de->rec_len);
 			if (le64_to_cpu(de->inode)) {
@@ -761,6 +1739,9 @@ int __ocfs2_add_entry(handle_t *handle,
 			de->name_len = namelen;
 			memcpy(de->name, name, namelen);
 
+			if (ocfs2_dir_indexed(dir))
+				ocfs2_recalc_free_list(dir, handle, lookup);
+
 			dir->i_version++;
 			status = ocfs2_journal_dirty(handle, insert_bh);
 			retval = 0;
@@ -870,6 +1851,10 @@ out:
 	return 0;
 }
 
+/*
+ * NOTE: This function can be called against unindexed directories,
+ * and indexed ones.
+ */
 static int ocfs2_dir_foreach_blk_el(struct inode *inode,
 				    u64 *f_version,
 				    loff_t *f_pos, void *priv,
@@ -1071,31 +2056,22 @@ int ocfs2_find_files_on_disk(const char *name,
 			     int namelen,
 			     u64 *blkno,
 			     struct inode *inode,
-			     struct buffer_head **dirent_bh,
-			     struct ocfs2_dir_entry **dirent)
+			     struct ocfs2_dir_lookup_result *lookup)
 {
 	int status = -ENOENT;
 
-	mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
-		   namelen, name, blkno, inode, dirent_bh, dirent);
+	mlog(0, "name=%.*s, blkno=%p, inode=%llu\n", namelen, name, blkno,
+	     (unsigned long long)OCFS2_I(inode)->ip_blkno);
 
-	*dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
-	if (!*dirent_bh || !*dirent) {
-		status = -ENOENT;
+	status = ocfs2_find_entry(name, namelen, inode, lookup);
+	if (status)
 		goto leave;
-	}
 
-	*blkno = le64_to_cpu((*dirent)->inode);
+	*blkno = le64_to_cpu(lookup->dl_entry->inode);
 
 	status = 0;
 leave:
-	if (status < 0) {
-		*dirent = NULL;
-		brelse(*dirent_bh);
-		*dirent_bh = NULL;
-	}
 
-	mlog_exit(status);
 	return status;
 }
 
@@ -1107,11 +2083,10 @@ int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
 			       int namelen, u64 *blkno)
 {
 	int ret;
-	struct buffer_head *bh = NULL;
-	struct ocfs2_dir_entry *dirent = NULL;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
-	ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
-	brelse(bh);
+	ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup);
+	ocfs2_free_dir_lookup_result(&lookup);
 
 	return ret;
 }
@@ -1128,20 +2103,18 @@ int ocfs2_check_dir_for_entry(struct inode *dir,
 			      int namelen)
 {
 	int ret;
-	struct buffer_head *dirent_bh = NULL;
-	struct ocfs2_dir_entry *dirent = NULL;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
 	mlog_entry("dir %llu, name '%.*s'\n",
 		   (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
 
 	ret = -EEXIST;
-	dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent);
-	if (dirent_bh)
+	if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0)
 		goto bail;
 
 	ret = 0;
 bail:
-	brelse(dirent_bh);
+	ocfs2_free_dir_lookup_result(&lookup);
 
 	mlog_exit(ret);
 	return ret;
@@ -1151,6 +2124,7 @@ struct ocfs2_empty_dir_priv {
 	unsigned seen_dot;
 	unsigned seen_dot_dot;
 	unsigned seen_other;
+	unsigned dx_dir;
 };
 static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
 				   loff_t pos, u64 ino, unsigned type)
@@ -1160,6 +2134,13 @@ static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
 	/*
 	 * Check the positions of "." and ".." records to be sure
 	 * they're in the correct place.
+	 *
+	 * Indexed directories don't need to proceed past the first
+	 * two entries, so we end the scan after seeing '..'. Despite
+	 * that, we allow the scan to proceed In the event that we
+	 * have a corrupted indexed directory (no dot or dot dot
+	 * entries). This allows us to double check for existing
+	 * entries which might not have been found in the index.
 	 */
 	if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
 		p->seen_dot = 1;
@@ -1169,16 +2150,57 @@ static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
 	if (name_len == 2 && !strncmp("..", name, 2) &&
 	    pos == OCFS2_DIR_REC_LEN(1)) {
 		p->seen_dot_dot = 1;
+
+		if (p->dx_dir && p->seen_dot)
+			return 1;
+
 		return 0;
 	}
 
 	p->seen_other = 1;
 	return 1;
 }
+
+static int ocfs2_empty_dir_dx(struct inode *inode,
+			      struct ocfs2_empty_dir_priv *priv)
+{
+	int ret;
+	struct buffer_head *di_bh = NULL;
+	struct buffer_head *dx_root_bh = NULL;
+	struct ocfs2_dinode *di;
+	struct ocfs2_dx_root_block *dx_root;
+
+	priv->dx_dir = 1;
+
+	ret = ocfs2_read_inode_block(inode, &di_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	di = (struct ocfs2_dinode *)di_bh->b_data;
+
+	ret = ocfs2_read_dx_root(inode, di, &dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+
+	if (le32_to_cpu(dx_root->dr_num_entries) != 2)
+		priv->seen_other = 1;
+
+out:
+	brelse(di_bh);
+	brelse(dx_root_bh);
+	return ret;
+}
+
 /*
  * routine to check that the specified directory is empty (for rmdir)
  *
  * Returns 1 if dir is empty, zero otherwise.
+ *
+ * XXX: This is a performance problem for unindexed directories.
  */
 int ocfs2_empty_dir(struct inode *inode)
 {
@@ -1188,6 +2210,16 @@ int ocfs2_empty_dir(struct inode *inode)
 
 	memset(&priv, 0, sizeof(priv));
 
+	if (ocfs2_dir_indexed(inode)) {
+		ret = ocfs2_empty_dir_dx(inode, &priv);
+		if (ret)
+			mlog_errno(ret);
+		/*
+		 * We still run ocfs2_dir_foreach to get the checks
+		 * for "." and "..".
+		 */
+	}
+
 	ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
 	if (ret)
 		mlog_errno(ret);
@@ -1280,7 +2312,8 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
 				 struct inode *parent,
 				 struct inode *inode,
 				 struct buffer_head *fe_bh,
-				 struct ocfs2_alloc_context *data_ac)
+				 struct ocfs2_alloc_context *data_ac,
+				 struct buffer_head **ret_new_bh)
 {
 	int status;
 	unsigned int size = osb->sb->s_blocksize;
@@ -1289,7 +2322,7 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
 
 	mlog_entry_void();
 
-	if (ocfs2_supports_dir_trailer(osb))
+	if (ocfs2_new_dir_wants_trailer(inode))
 		size = ocfs2_dir_trailer_blk_off(parent->i_sb);
 
 	status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
@@ -1310,8 +2343,19 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
 	memset(new_bh->b_data, 0, osb->sb->s_blocksize);
 
 	de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size);
-	if (ocfs2_supports_dir_trailer(osb))
-		ocfs2_init_dir_trailer(inode, new_bh);
+	if (ocfs2_new_dir_wants_trailer(inode)) {
+		int size = le16_to_cpu(de->rec_len);
+
+		/*
+		 * Figure out the size of the hole left over after
+		 * insertion of '.' and '..'. The trailer wants this
+		 * information.
+		 */
+		size -= OCFS2_DIR_REC_LEN(2);
+		size -= sizeof(struct ocfs2_dir_block_trailer);
+
+		ocfs2_init_dir_trailer(inode, new_bh, size);
+	}
 
 	status = ocfs2_journal_dirty(handle, new_bh);
 	if (status < 0) {
@@ -1329,6 +2373,10 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
 	}
 
 	status = 0;
+	if (ret_new_bh) {
+		*ret_new_bh = new_bh;
+		new_bh = NULL;
+	}
 bail:
 	brelse(new_bh);
 
@@ -1336,20 +2384,427 @@ bail:
 	return status;
 }
 
+static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
+				     handle_t *handle, struct inode *dir,
+				     struct buffer_head *di_bh,
+				     struct buffer_head *dirdata_bh,
+				     struct ocfs2_alloc_context *meta_ac,
+				     int dx_inline, u32 num_entries,
+				     struct buffer_head **ret_dx_root_bh)
+{
+	int ret;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
+	u16 dr_suballoc_bit;
+	u64 dr_blkno;
+	unsigned int num_bits;
+	struct buffer_head *dx_root_bh = NULL;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dir_block_trailer *trailer =
+		ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
+
+	ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, &dr_suballoc_bit,
+				   &num_bits, &dr_blkno);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	mlog(0, "Dir %llu, attach new index block: %llu\n",
+	     (unsigned long long)OCFS2_I(dir)->ip_blkno,
+	     (unsigned long long)dr_blkno);
+
+	dx_root_bh = sb_getblk(osb->sb, dr_blkno);
+	if (dx_root_bh == NULL) {
+		ret = -EIO;
+		goto out;
+	}
+	ocfs2_set_new_buffer_uptodate(dir, dx_root_bh);
+
+	ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+				      OCFS2_JOURNAL_ACCESS_CREATE);
+	if (ret < 0) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	memset(dx_root, 0, osb->sb->s_blocksize);
+	strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE);
+	dx_root->dr_suballoc_slot = cpu_to_le16(osb->slot_num);
+	dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit);
+	dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation);
+	dx_root->dr_blkno = cpu_to_le64(dr_blkno);
+	dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno);
+	dx_root->dr_num_entries = cpu_to_le32(num_entries);
+	if (le16_to_cpu(trailer->db_free_rec_len))
+		dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
+	else
+		dx_root->dr_free_blk = cpu_to_le64(0);
+
+	if (dx_inline) {
+		dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE;
+		dx_root->dr_entries.de_count =
+			cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb));
+	} else {
+		dx_root->dr_list.l_count =
+			cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
+	}
+
+	ret = ocfs2_journal_dirty(handle, dx_root_bh);
+	if (ret)
+		mlog_errno(ret);
+
+	ret = ocfs2_journal_access_di(handle, dir, di_bh,
+				      OCFS2_JOURNAL_ACCESS_CREATE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	di->i_dx_root = cpu_to_le64(dr_blkno);
+
+	OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
+	di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
+
+	ret = ocfs2_journal_dirty(handle, di_bh);
+	if (ret)
+		mlog_errno(ret);
+
+	*ret_dx_root_bh = dx_root_bh;
+	dx_root_bh = NULL;
+
+out:
+	brelse(dx_root_bh);
+	return ret;
+}
+
+static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb,
+				       handle_t *handle, struct inode *dir,
+				       struct buffer_head **dx_leaves,
+				       int num_dx_leaves, u64 start_blk)
+{
+	int ret, i;
+	struct ocfs2_dx_leaf *dx_leaf;
+	struct buffer_head *bh;
+
+	for (i = 0; i < num_dx_leaves; i++) {
+		bh = sb_getblk(osb->sb, start_blk + i);
+		if (bh == NULL) {
+			ret = -EIO;
+			goto out;
+		}
+		dx_leaves[i] = bh;
+
+		ocfs2_set_new_buffer_uptodate(dir, bh);
+
+		ret = ocfs2_journal_access_dl(handle, dir, bh,
+					      OCFS2_JOURNAL_ACCESS_CREATE);
+		if (ret < 0) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data;
+
+		memset(dx_leaf, 0, osb->sb->s_blocksize);
+		strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE);
+		dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation);
+		dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr);
+		dx_leaf->dl_list.de_count =
+			cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb));
+
+		mlog(0,
+		     "Dir %llu, format dx_leaf: %llu, entry count: %u\n",
+		     (unsigned long long)OCFS2_I(dir)->ip_blkno,
+		     (unsigned long long)bh->b_blocknr,
+		     le16_to_cpu(dx_leaf->dl_list.de_count));
+
+		ocfs2_journal_dirty(handle, bh);
+	}
+
+	ret = 0;
+out:
+	return ret;
+}
+
+/*
+ * Allocates and formats a new cluster for use in an indexed dir
+ * leaf. This version will not do the extent insert, so that it can be
+ * used by operations which need careful ordering.
+ */
+static int __ocfs2_dx_dir_new_cluster(struct inode *dir,
+				      u32 cpos, handle_t *handle,
+				      struct ocfs2_alloc_context *data_ac,
+				      struct buffer_head **dx_leaves,
+				      int num_dx_leaves, u64 *ret_phys_blkno)
+{
+	int ret;
+	u32 phys, num;
+	u64 phys_blkno;
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+
+	/*
+	 * XXX: For create, this should claim cluster for the index
+	 * *before* the unindexed insert so that we have a better
+	 * chance of contiguousness as the directory grows in number
+	 * of entries.
+	 */
+	ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 1, &phys, &num);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	/*
+	 * Format the new cluster first. That way, we're inserting
+	 * valid data.
+	 */
+	phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys);
+	ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves,
+					  num_dx_leaves, phys_blkno);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	*ret_phys_blkno = phys_blkno;
+out:
+	return ret;
+}
+
+static int ocfs2_dx_dir_new_cluster(struct inode *dir,
+				    struct ocfs2_extent_tree *et,
+				    u32 cpos, handle_t *handle,
+				    struct ocfs2_alloc_context *data_ac,
+				    struct ocfs2_alloc_context *meta_ac,
+				    struct buffer_head **dx_leaves,
+				    int num_dx_leaves)
+{
+	int ret;
+	u64 phys_blkno;
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+
+	ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves,
+					 num_dx_leaves, &phys_blkno);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_insert_extent(osb, handle, dir, et, cpos, phys_blkno, 1, 0,
+				  meta_ac);
+	if (ret)
+		mlog_errno(ret);
+out:
+	return ret;
+}
+
+static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb,
+							int *ret_num_leaves)
+{
+	int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1);
+	struct buffer_head **dx_leaves;
+
+	dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *),
+			    GFP_NOFS);
+	if (dx_leaves && ret_num_leaves)
+		*ret_num_leaves = num_dx_leaves;
+
+	return dx_leaves;
+}
+
+static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb,
+				 handle_t *handle,
+				 struct inode *parent,
+				 struct inode *inode,
+				 struct buffer_head *di_bh,
+				 struct ocfs2_alloc_context *data_ac,
+				 struct ocfs2_alloc_context *meta_ac)
+{
+	int ret;
+	struct buffer_head *leaf_bh = NULL;
+	struct buffer_head *dx_root_bh = NULL;
+	struct ocfs2_dx_hinfo hinfo;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dx_entry_list *entry_list;
+
+	/*
+	 * Our strategy is to create the directory as though it were
+	 * unindexed, then add the index block. This works with very
+	 * little complication since the state of a new directory is a
+	 * very well known quantity.
+	 *
+	 * Essentially, we have two dirents ("." and ".."), in the 1st
+	 * block which need indexing. These are easily inserted into
+	 * the index block.
+	 */
+
+	ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh,
+				    data_ac, &leaf_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh,
+					meta_ac, 1, 2, &dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	entry_list = &dx_root->dr_entries;
+
+	/* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */
+	ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo);
+	ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
+
+	ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo);
+	ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
+
+out:
+	brelse(dx_root_bh);
+	brelse(leaf_bh);
+	return ret;
+}
+
 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 		       handle_t *handle,
 		       struct inode *parent,
 		       struct inode *inode,
 		       struct buffer_head *fe_bh,
-		       struct ocfs2_alloc_context *data_ac)
+		       struct ocfs2_alloc_context *data_ac,
+		       struct ocfs2_alloc_context *meta_ac)
+
 {
 	BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
 
 	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 		return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
 
+	if (ocfs2_supports_indexed_dirs(osb))
+		return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh,
+					     data_ac, meta_ac);
+
 	return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
-				     data_ac);
+				     data_ac, NULL);
+}
+
+static int ocfs2_dx_dir_index_block(struct inode *dir,
+				    handle_t *handle,
+				    struct buffer_head **dx_leaves,
+				    int num_dx_leaves,
+				    u32 *num_dx_entries,
+				    struct buffer_head *dirent_bh)
+{
+	int ret, namelen, i;
+	char *de_buf, *limit;
+	struct ocfs2_dir_entry *de;
+	struct buffer_head *dx_leaf_bh;
+	struct ocfs2_dx_hinfo hinfo;
+	u64 dirent_blk = dirent_bh->b_blocknr;
+
+	de_buf = dirent_bh->b_data;
+	limit = de_buf + dir->i_sb->s_blocksize;
+
+	while (de_buf < limit) {
+		de = (struct ocfs2_dir_entry *)de_buf;
+
+		namelen = de->name_len;
+		if (!namelen || !de->inode)
+			goto inc;
+
+		ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo);
+
+		i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo);
+		dx_leaf_bh = dx_leaves[i];
+
+		ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo,
+						 dirent_blk, dx_leaf_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		*num_dx_entries = *num_dx_entries + 1;
+
+inc:
+		de_buf += le16_to_cpu(de->rec_len);
+	}
+
+out:
+	return ret;
+}
+
+/*
+ * XXX: This expects dx_root_bh to already be part of the transaction.
+ */
+static void ocfs2_dx_dir_index_root_block(struct inode *dir,
+					 struct buffer_head *dx_root_bh,
+					 struct buffer_head *dirent_bh)
+{
+	char *de_buf, *limit;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dir_entry *de;
+	struct ocfs2_dx_hinfo hinfo;
+	u64 dirent_blk = dirent_bh->b_blocknr;
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+
+	de_buf = dirent_bh->b_data;
+	limit = de_buf + dir->i_sb->s_blocksize;
+
+	while (de_buf < limit) {
+		de = (struct ocfs2_dir_entry *)de_buf;
+
+		if (!de->name_len || !de->inode)
+			goto inc;
+
+		ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo);
+
+		mlog(0,
+		     "dir: %llu, major: 0x%x minor: 0x%x, index: %u, name: %.*s\n",
+		     (unsigned long long)dir->i_ino, hinfo.major_hash,
+		     hinfo.minor_hash,
+		     le16_to_cpu(dx_root->dr_entries.de_num_used),
+		     de->name_len, de->name);
+
+		ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo,
+					   dirent_blk);
+
+		le32_add_cpu(&dx_root->dr_num_entries, 1);
+inc:
+		de_buf += le16_to_cpu(de->rec_len);
+	}
+}
+
+/*
+ * Count the number of inline directory entries in di_bh and compare
+ * them against the number of entries we can hold in an inline dx root
+ * block.
+ */
+static int ocfs2_new_dx_should_be_inline(struct inode *dir,
+					 struct buffer_head *di_bh)
+{
+	int dirent_count = 0;
+	char *de_buf, *limit;
+	struct ocfs2_dir_entry *de;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+	de_buf = di->id2.i_data.id_data;
+	limit = de_buf + i_size_read(dir);
+
+	while (de_buf < limit) {
+		de = (struct ocfs2_dir_entry *)de_buf;
+
+		if (de->name_len && de->inode)
+			dirent_count++;
+
+		de_buf += le16_to_cpu(de->rec_len);
+	}
+
+	/* We are careful to leave room for one extra record. */
+	return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb);
 }
 
 /*
@@ -1358,18 +2813,26 @@ int ocfs2_fill_new_dir(struct ocfs2_super *osb,
  * expansion from an inline directory to one with extents. The first dir block
  * in that case is taken from the inline data portion of the inode block.
  *
+ * This will also return the largest amount of contiguous space for a dirent
+ * in the block. That value is *not* necessarily the last dirent, even after
+ * expansion. The directory indexing code wants this value for free space
+ * accounting. We do this here since we're already walking the entire dir
+ * block.
+ *
  * We add the dir trailer if this filesystem wants it.
  */
-static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
-				     struct super_block *sb)
+static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size,
+					     struct inode *dir)
 {
+	struct super_block *sb = dir->i_sb;
 	struct ocfs2_dir_entry *de;
 	struct ocfs2_dir_entry *prev_de;
 	char *de_buf, *limit;
 	unsigned int new_size = sb->s_blocksize;
-	unsigned int bytes;
+	unsigned int bytes, this_hole;
+	unsigned int largest_hole = 0;
 
-	if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
+	if (ocfs2_new_dir_wants_trailer(dir))
 		new_size = ocfs2_dir_trailer_blk_off(sb);
 
 	bytes = new_size - old_size;
@@ -1378,12 +2841,26 @@ static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
 	de_buf = start;
 	de = (struct ocfs2_dir_entry *)de_buf;
 	do {
+		this_hole = ocfs2_figure_dirent_hole(de);
+		if (this_hole > largest_hole)
+			largest_hole = this_hole;
+
 		prev_de = de;
 		de_buf += le16_to_cpu(de->rec_len);
 		de = (struct ocfs2_dir_entry *)de_buf;
 	} while (de_buf < limit);
 
 	le16_add_cpu(&prev_de->rec_len, bytes);
+
+	/* We need to double check this after modification of the final
+	 * dirent. */
+	this_hole = ocfs2_figure_dirent_hole(prev_de);
+	if (this_hole > largest_hole)
+		largest_hole = this_hole;
+
+	if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
+		return largest_hole;
+	return 0;
 }
 
 /*
@@ -1396,29 +2873,61 @@ static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
  */
 static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 				   unsigned int blocks_wanted,
+				   struct ocfs2_dir_lookup_result *lookup,
 				   struct buffer_head **first_block_bh)
 {
-	u32 alloc, bit_off, len;
+	u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0;
 	struct super_block *sb = dir->i_sb;
-	int ret, credits = ocfs2_inline_to_extents_credits(sb);
-	u64 blkno, bytes = blocks_wanted << sb->s_blocksize_bits;
+	int ret, i, num_dx_leaves = 0, dx_inline = 0,
+		credits = ocfs2_inline_to_extents_credits(sb);
+	u64 dx_insert_blkno, blkno,
+		bytes = blocks_wanted << sb->s_blocksize_bits;
 	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 	struct ocfs2_inode_info *oi = OCFS2_I(dir);
 	struct ocfs2_alloc_context *data_ac;
+	struct ocfs2_alloc_context *meta_ac = NULL;
 	struct buffer_head *dirdata_bh = NULL;
+	struct buffer_head *dx_root_bh = NULL;
+	struct buffer_head **dx_leaves = NULL;
 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 	handle_t *handle;
 	struct ocfs2_extent_tree et;
-	int did_quota = 0;
+	struct ocfs2_extent_tree dx_et;
+	int did_quota = 0, bytes_allocated = 0;
 
 	ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
 
 	alloc = ocfs2_clusters_for_bytes(sb, bytes);
+	dx_alloc = 0;
+
+	if (ocfs2_supports_indexed_dirs(osb)) {
+		credits += ocfs2_add_dir_index_credits(sb);
+
+		dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh);
+		if (!dx_inline) {
+			/* Add one more cluster for an index leaf */
+			dx_alloc++;
+			dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb,
+								&num_dx_leaves);
+			if (!dx_leaves) {
+				ret = -ENOMEM;
+				mlog_errno(ret);
+				goto out;
+			}
+		}
+
+		/* This gets us the dx_root */
+		ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+	}
 
 	/*
-	 * We should never need more than 2 clusters for this -
-	 * maximum dirent size is far less than one block. In fact,
-	 * the only time we'd need more than one cluster is if
+	 * We should never need more than 2 clusters for the unindexed
+	 * tree - maximum dirent size is far less than one block. In
+	 * fact, the only time we'd need more than one cluster is if
 	 * blocksize == clustersize and the dirent won't fit in the
 	 * extra space that the expansion to a single block gives. As
 	 * of today, that only happens on 4k/4k file systems.
@@ -1435,7 +2944,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 
 	/*
 	 * Prepare for worst case allocation scenario of two separate
-	 * extents.
+	 * extents in the unindexed tree.
 	 */
 	if (alloc == 2)
 		credits += OCFS2_SUBALLOC_ALLOC;
@@ -1448,11 +2957,29 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 	}
 
 	if (vfs_dq_alloc_space_nodirty(dir,
-				ocfs2_clusters_to_bytes(osb->sb, alloc))) {
+				ocfs2_clusters_to_bytes(osb->sb,
+							alloc + dx_alloc))) {
 		ret = -EDQUOT;
 		goto out_commit;
 	}
 	did_quota = 1;
+
+	if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
+		/*
+		 * Allocate our index cluster first, to maximize the
+		 * possibility that unindexed leaves grow
+		 * contiguously.
+		 */
+		ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac,
+						 dx_leaves, num_dx_leaves,
+						 &dx_insert_blkno);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+		bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
+	}
+
 	/*
 	 * Try to claim as many clusters as the bitmap can give though
 	 * if we only get one now, that's enough to continue. The rest
@@ -1463,6 +2990,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 		mlog_errno(ret);
 		goto out_commit;
 	}
+	bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
 
 	/*
 	 * Operations are carefully ordered so that we set up the new
@@ -1489,9 +3017,16 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 	memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
 	memset(dirdata_bh->b_data + i_size_read(dir), 0,
 	       sb->s_blocksize - i_size_read(dir));
-	ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), sb);
-	if (ocfs2_supports_dir_trailer(osb))
-		ocfs2_init_dir_trailer(dir, dirdata_bh);
+	i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir);
+	if (ocfs2_new_dir_wants_trailer(dir)) {
+		/*
+		 * Prepare the dir trailer up front. It will otherwise look
+		 * like a valid dirent. Even if inserting the index fails
+		 * (unlikely), then all we'll have done is given first dir
+		 * block a small amount of fragmentation.
+		 */
+		ocfs2_init_dir_trailer(dir, dirdata_bh, i);
+	}
 
 	ret = ocfs2_journal_dirty(handle, dirdata_bh);
 	if (ret) {
@@ -1499,6 +3034,24 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 		goto out_commit;
 	}
 
+	if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
+		/*
+		 * Dx dirs with an external cluster need to do this up
+		 * front. Inline dx root's get handled later, after
+		 * we've allocated our root block. We get passed back
+		 * a total number of items so that dr_num_entries can
+		 * be correctly set once the dx_root has been
+		 * allocated.
+		 */
+		ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves,
+					       num_dx_leaves, &num_dx_entries,
+					       dirdata_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+	}
+
 	/*
 	 * Set extent, i_size, etc on the directory. After this, the
 	 * inode should contain the same exact dirents as before and
@@ -1551,6 +3104,27 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 		goto out_commit;
 	}
 
+	if (ocfs2_supports_indexed_dirs(osb)) {
+		ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh,
+						dirdata_bh, meta_ac, dx_inline,
+						num_dx_entries, &dx_root_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+
+		if (dx_inline) {
+			ocfs2_dx_dir_index_root_block(dir, dx_root_bh,
+						      dirdata_bh);
+		} else {
+			ocfs2_init_dx_root_extent_tree(&dx_et, dir, dx_root_bh);
+			ret = ocfs2_insert_extent(osb, handle, dir, &dx_et, 0,
+						  dx_insert_blkno, 1, 0, NULL);
+			if (ret)
+				mlog_errno(ret);
+		}
+	}
+
 	/*
 	 * We asked for two clusters, but only got one in the 1st
 	 * pass. Claim the 2nd cluster as a separate extent.
@@ -1570,15 +3144,32 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 			mlog_errno(ret);
 			goto out_commit;
 		}
+		bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
 	}
 
 	*first_block_bh = dirdata_bh;
 	dirdata_bh = NULL;
+	if (ocfs2_supports_indexed_dirs(osb)) {
+		unsigned int off;
+
+		if (!dx_inline) {
+			/*
+			 * We need to return the correct block within the
+			 * cluster which should hold our entry.
+			 */
+			off = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb),
+						    &lookup->dl_hinfo);
+			get_bh(dx_leaves[off]);
+			lookup->dl_dx_leaf_bh = dx_leaves[off];
+		}
+		lookup->dl_dx_root_bh = dx_root_bh;
+		dx_root_bh = NULL;
+	}
 
 out_commit:
 	if (ret < 0 && did_quota)
-		vfs_dq_free_space_nodirty(dir,
-			ocfs2_clusters_to_bytes(osb->sb, 2));
+		vfs_dq_free_space_nodirty(dir, bytes_allocated);
+
 	ocfs2_commit_trans(osb, handle);
 
 out_sem:
@@ -1587,8 +3178,17 @@ out_sem:
 out:
 	if (data_ac)
 		ocfs2_free_alloc_context(data_ac);
+	if (meta_ac)
+		ocfs2_free_alloc_context(meta_ac);
+
+	if (dx_leaves) {
+		for (i = 0; i < num_dx_leaves; i++)
+			brelse(dx_leaves[i]);
+		kfree(dx_leaves);
+	}
 
 	brelse(dirdata_bh);
+	brelse(dx_root_bh);
 
 	return ret;
 }
@@ -1658,11 +3258,14 @@ bail:
  * is to be turned into an extent based one. The size of the dirent to
  * insert might be larger than the space gained by growing to just one
  * block, so we may have to grow the inode by two blocks in that case.
+ *
+ * If the directory is already indexed, dx_root_bh must be provided.
  */
 static int ocfs2_extend_dir(struct ocfs2_super *osb,
 			    struct inode *dir,
 			    struct buffer_head *parent_fe_bh,
 			    unsigned int blocks_wanted,
+			    struct ocfs2_dir_lookup_result *lookup,
 			    struct buffer_head **new_de_bh)
 {
 	int status = 0;
@@ -1677,17 +3280,29 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
 	struct ocfs2_dir_entry * de;
 	struct super_block *sb = osb->sb;
 	struct ocfs2_extent_tree et;
+	struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
 
 	mlog_entry_void();
 
 	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+		/*
+		 * This would be a code error as an inline directory should
+		 * never have an index root.
+		 */
+		BUG_ON(dx_root_bh);
+
 		status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
-						 blocks_wanted, &new_bh);
+						 blocks_wanted, lookup,
+						 &new_bh);
 		if (status) {
 			mlog_errno(status);
 			goto bail;
 		}
 
+		/* Expansion from inline to an indexed directory will
+		 * have given us this. */
+		dx_root_bh = lookup->dl_dx_root_bh;
+
 		if (blocks_wanted == 1) {
 			/*
 			 * If the new dirent will fit inside the space
@@ -1751,6 +3366,10 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
 	}
 
 do_extend:
+	if (ocfs2_dir_indexed(dir))
+		credits++; /* For attaching the new dirent block to the
+			    * dx_root */
+
 	down_write(&OCFS2_I(dir)->ip_alloc_sem);
 	drop_alloc_sem = 1;
 
@@ -1781,9 +3400,19 @@ do_extend:
 
 	de = (struct ocfs2_dir_entry *) new_bh->b_data;
 	de->inode = 0;
-	if (ocfs2_dir_has_trailer(dir)) {
+	if (ocfs2_supports_dir_trailer(dir)) {
 		de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb));
-		ocfs2_init_dir_trailer(dir, new_bh);
+
+		ocfs2_init_dir_trailer(dir, new_bh, le16_to_cpu(de->rec_len));
+
+		if (ocfs2_dir_indexed(dir)) {
+			status = ocfs2_dx_dir_link_trailer(dir, handle,
+							   dx_root_bh, new_bh);
+			if (status) {
+				mlog_errno(status);
+				goto bail;
+			}
+		}
 	} else {
 		de->rec_len = cpu_to_le16(sb->s_blocksize);
 	}
@@ -1839,7 +3468,7 @@ static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
 	 * This calculates how many free bytes we'd have in block zero, should
 	 * this function force expansion to an extent tree.
 	 */
-	if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
+	if (ocfs2_new_dir_wants_trailer(dir))
 		free_space = ocfs2_dir_trailer_blk_off(sb) - i_size_read(dir);
 	else
 		free_space = dir->i_sb->s_blocksize - i_size_read(dir);
@@ -1970,12 +3599,766 @@ bail:
 	return status;
 }
 
+static int dx_leaf_sort_cmp(const void *a, const void *b)
+{
+	const struct ocfs2_dx_entry *entry1 = a;
+	const struct ocfs2_dx_entry *entry2 = b;
+	u32 major_hash1 = le32_to_cpu(entry1->dx_major_hash);
+	u32 major_hash2 = le32_to_cpu(entry2->dx_major_hash);
+	u32 minor_hash1 = le32_to_cpu(entry1->dx_minor_hash);
+	u32 minor_hash2 = le32_to_cpu(entry2->dx_minor_hash);
+
+	if (major_hash1 > major_hash2)
+		return 1;
+	if (major_hash1 < major_hash2)
+		return -1;
+
+	/*
+	 * It is not strictly necessary to sort by minor
+	 */
+	if (minor_hash1 > minor_hash2)
+		return 1;
+	if (minor_hash1 < minor_hash2)
+		return -1;
+	return 0;
+}
+
+static void dx_leaf_sort_swap(void *a, void *b, int size)
+{
+	struct ocfs2_dx_entry *entry1 = a;
+	struct ocfs2_dx_entry *entry2 = b;
+	struct ocfs2_dx_entry tmp;
+
+	BUG_ON(size != sizeof(*entry1));
+
+	tmp = *entry1;
+	*entry1 = *entry2;
+	*entry2 = tmp;
+}
+
+static int ocfs2_dx_leaf_same_major(struct ocfs2_dx_leaf *dx_leaf)
+{
+	struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
+	int i, num = le16_to_cpu(dl_list->de_num_used);
+
+	for (i = 0; i < (num - 1); i++) {
+		if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) !=
+		    le32_to_cpu(dl_list->de_entries[i + 1].dx_major_hash))
+			return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * Find the optimal value to split this leaf on. This expects the leaf
+ * entries to be in sorted order.
+ *
+ * leaf_cpos is the cpos of the leaf we're splitting. insert_hash is
+ * the hash we want to insert.
+ *
+ * This function is only concerned with the major hash - that which
+ * determines which cluster an item belongs to.
+ */
+static int ocfs2_dx_dir_find_leaf_split(struct ocfs2_dx_leaf *dx_leaf,
+					u32 leaf_cpos, u32 insert_hash,
+					u32 *split_hash)
+{
+	struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
+	int i, num_used = le16_to_cpu(dl_list->de_num_used);
+	int allsame;
+
+	/*
+	 * There's a couple rare, but nasty corner cases we have to
+	 * check for here. All of them involve a leaf where all value
+	 * have the same hash, which is what we look for first.
+	 *
+	 * Most of the time, all of the above is false, and we simply
+	 * pick the median value for a split.
+	 */
+	allsame = ocfs2_dx_leaf_same_major(dx_leaf);
+	if (allsame) {
+		u32 val = le32_to_cpu(dl_list->de_entries[0].dx_major_hash);
+
+		if (val == insert_hash) {
+			/*
+			 * No matter where we would choose to split,
+			 * the new entry would want to occupy the same
+			 * block as these. Since there's no space left
+			 * in their existing block, we know there
+			 * won't be space after the split.
+			 */
+			return -ENOSPC;
+		}
+
+		if (val == leaf_cpos) {
+			/*
+			 * Because val is the same as leaf_cpos (which
+			 * is the smallest value this leaf can have),
+			 * yet is not equal to insert_hash, then we
+			 * know that insert_hash *must* be larger than
+			 * val (and leaf_cpos). At least cpos+1 in value.
+			 *
+			 * We also know then, that there cannot be an
+			 * adjacent extent (otherwise we'd be looking
+			 * at it). Choosing this value gives us a
+			 * chance to get some contiguousness.
+			 */
+			*split_hash = leaf_cpos + 1;
+			return 0;
+		}
+
+		if (val > insert_hash) {
+			/*
+			 * val can not be the same as insert hash, and
+			 * also must be larger than leaf_cpos. Also,
+			 * we know that there can't be a leaf between
+			 * cpos and val, otherwise the entries with
+			 * hash 'val' would be there.
+			 */
+			*split_hash = val;
+			return 0;
+		}
+
+		*split_hash = insert_hash;
+		return 0;
+	}
+
+	/*
+	 * Since the records are sorted and the checks above
+	 * guaranteed that not all records in this block are the same,
+	 * we simple travel forward, from the median, and pick the 1st
+	 * record whose value is larger than leaf_cpos.
+	 */
+	for (i = (num_used / 2); i < num_used; i++)
+		if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) >
+		    leaf_cpos)
+			break;
+
+	BUG_ON(i == num_used); /* Should be impossible */
+	*split_hash = le32_to_cpu(dl_list->de_entries[i].dx_major_hash);
+	return 0;
+}
+
+/*
+ * Transfer all entries in orig_dx_leaves whose major hash is equal to or
+ * larger than split_hash into new_dx_leaves. We use a temporary
+ * buffer (tmp_dx_leaf) to make the changes to the original leaf blocks.
+ *
+ * Since the block offset inside a leaf (cluster) is a constant mask
+ * of minor_hash, we can optimize - an item at block offset X within
+ * the original cluster, will be at offset X within the new cluster.
+ */
+static void ocfs2_dx_dir_transfer_leaf(struct inode *dir, u32 split_hash,
+				       handle_t *handle,
+				       struct ocfs2_dx_leaf *tmp_dx_leaf,
+				       struct buffer_head **orig_dx_leaves,
+				       struct buffer_head **new_dx_leaves,
+				       int num_dx_leaves)
+{
+	int i, j, num_used;
+	u32 major_hash;
+	struct ocfs2_dx_leaf *orig_dx_leaf, *new_dx_leaf;
+	struct ocfs2_dx_entry_list *orig_list, *new_list, *tmp_list;
+	struct ocfs2_dx_entry *dx_entry;
+
+	tmp_list = &tmp_dx_leaf->dl_list;
+
+	for (i = 0; i < num_dx_leaves; i++) {
+		orig_dx_leaf = (struct ocfs2_dx_leaf *) orig_dx_leaves[i]->b_data;
+		orig_list = &orig_dx_leaf->dl_list;
+		new_dx_leaf = (struct ocfs2_dx_leaf *) new_dx_leaves[i]->b_data;
+		new_list = &new_dx_leaf->dl_list;
+
+		num_used = le16_to_cpu(orig_list->de_num_used);
+
+		memcpy(tmp_dx_leaf, orig_dx_leaf, dir->i_sb->s_blocksize);
+		tmp_list->de_num_used = cpu_to_le16(0);
+		memset(&tmp_list->de_entries, 0, sizeof(*dx_entry)*num_used);
+
+		for (j = 0; j < num_used; j++) {
+			dx_entry = &orig_list->de_entries[j];
+			major_hash = le32_to_cpu(dx_entry->dx_major_hash);
+			if (major_hash >= split_hash)
+				ocfs2_dx_dir_leaf_insert_tail(new_dx_leaf,
+							      dx_entry);
+			else
+				ocfs2_dx_dir_leaf_insert_tail(tmp_dx_leaf,
+							      dx_entry);
+		}
+		memcpy(orig_dx_leaf, tmp_dx_leaf, dir->i_sb->s_blocksize);
+
+		ocfs2_journal_dirty(handle, orig_dx_leaves[i]);
+		ocfs2_journal_dirty(handle, new_dx_leaves[i]);
+	}
+}
+
+static int ocfs2_dx_dir_rebalance_credits(struct ocfs2_super *osb,
+					  struct ocfs2_dx_root_block *dx_root)
+{
+	int credits = ocfs2_clusters_to_blocks(osb->sb, 2);
+
+	credits += ocfs2_calc_extend_credits(osb->sb, &dx_root->dr_list, 1);
+	credits += ocfs2_quota_trans_credits(osb->sb);
+	return credits;
+}
+
+/*
+ * Find the median value in dx_leaf_bh and allocate a new leaf to move
+ * half our entries into.
+ */
+static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
+				  struct buffer_head *dx_root_bh,
+				  struct buffer_head *dx_leaf_bh,
+				  struct ocfs2_dx_hinfo *hinfo, u32 leaf_cpos,
+				  u64 leaf_blkno)
+{
+	struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
+	int credits, ret, i, num_used, did_quota = 0;
+	u32 cpos, split_hash, insert_hash = hinfo->major_hash;
+	u64 orig_leaves_start;
+	int num_dx_leaves;
+	struct buffer_head **orig_dx_leaves = NULL;
+	struct buffer_head **new_dx_leaves = NULL;
+	struct ocfs2_alloc_context *data_ac = NULL, *meta_ac = NULL;
+	struct ocfs2_extent_tree et;
+	handle_t *handle = NULL;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dx_leaf *tmp_dx_leaf = NULL;
+
+	mlog(0, "DX Dir: %llu, rebalance leaf leaf_blkno: %llu insert: %u\n",
+	     (unsigned long long)OCFS2_I(dir)->ip_blkno,
+	     (unsigned long long)leaf_blkno, insert_hash);
+
+	ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	/*
+	 * XXX: This is a rather large limit. We should use a more
+	 * realistic value.
+	 */
+	if (le32_to_cpu(dx_root->dr_clusters) == UINT_MAX)
+		return -ENOSPC;
+
+	num_used = le16_to_cpu(dx_leaf->dl_list.de_num_used);
+	if (num_used < le16_to_cpu(dx_leaf->dl_list.de_count)) {
+		mlog(ML_ERROR, "DX Dir: %llu, Asked to rebalance empty leaf: "
+		     "%llu, %d\n", (unsigned long long)OCFS2_I(dir)->ip_blkno,
+		     (unsigned long long)leaf_blkno, num_used);
+		ret = -EIO;
+		goto out;
+	}
+
+	orig_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
+	if (!orig_dx_leaves) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	new_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, NULL);
+	if (!new_dx_leaves) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_lock_allocators(dir, &et, 1, 0, &data_ac, &meta_ac);
+	if (ret) {
+		if (ret != -ENOSPC)
+			mlog_errno(ret);
+		goto out;
+	}
+
+	credits = ocfs2_dx_dir_rebalance_credits(osb, dx_root);
+	handle = ocfs2_start_trans(osb, credits);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		handle = NULL;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (vfs_dq_alloc_space_nodirty(dir,
+				       ocfs2_clusters_to_bytes(dir->i_sb, 1))) {
+		ret = -EDQUOT;
+		goto out_commit;
+	}
+	did_quota = 1;
+
+	ret = ocfs2_journal_access_dl(handle, dir, dx_leaf_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	/*
+	 * This block is changing anyway, so we can sort it in place.
+	 */
+	sort(dx_leaf->dl_list.de_entries, num_used,
+	     sizeof(struct ocfs2_dx_entry), dx_leaf_sort_cmp,
+	     dx_leaf_sort_swap);
+
+	ret = ocfs2_journal_dirty(handle, dx_leaf_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	ret = ocfs2_dx_dir_find_leaf_split(dx_leaf, leaf_cpos, insert_hash,
+					   &split_hash);
+	if (ret) {
+		mlog_errno(ret);
+		goto  out_commit;
+	}
+
+	mlog(0, "Split leaf (%u) at %u, insert major hash is %u\n",
+	     leaf_cpos, split_hash, insert_hash);
+
+	/*
+	 * We have to carefully order operations here. There are items
+	 * which want to be in the new cluster before insert, but in
+	 * order to put those items in the new cluster, we alter the
+	 * old cluster. A failure to insert gets nasty.
+	 *
+	 * So, start by reserving writes to the old
+	 * cluster. ocfs2_dx_dir_new_cluster will reserve writes on
+	 * the new cluster for us, before inserting it. The insert
+	 * won't happen if there's an error before that. Once the
+	 * insert is done then, we can transfer from one leaf into the
+	 * other without fear of hitting any error.
+	 */
+
+	/*
+	 * The leaf transfer wants some scratch space so that we don't
+	 * wind up doing a bunch of expensive memmove().
+	 */
+	tmp_dx_leaf = kmalloc(osb->sb->s_blocksize, GFP_NOFS);
+	if (!tmp_dx_leaf) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	orig_leaves_start = ocfs2_block_to_cluster_start(dir->i_sb, leaf_blkno);
+	ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves,
+				   orig_dx_leaves);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	for (i = 0; i < num_dx_leaves; i++) {
+		ret = ocfs2_journal_access_dl(handle, dir, orig_dx_leaves[i],
+					      OCFS2_JOURNAL_ACCESS_WRITE);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+	}
+
+	cpos = split_hash;
+	ret = ocfs2_dx_dir_new_cluster(dir, &et, cpos, handle,
+				       data_ac, meta_ac, new_dx_leaves,
+				       num_dx_leaves);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	ocfs2_dx_dir_transfer_leaf(dir, split_hash, handle, tmp_dx_leaf,
+				   orig_dx_leaves, new_dx_leaves, num_dx_leaves);
+
+out_commit:
+	if (ret < 0 && did_quota)
+		vfs_dq_free_space_nodirty(dir,
+				ocfs2_clusters_to_bytes(dir->i_sb, 1));
+
+	ocfs2_commit_trans(osb, handle);
+
+out:
+	if (orig_dx_leaves || new_dx_leaves) {
+		for (i = 0; i < num_dx_leaves; i++) {
+			if (orig_dx_leaves)
+				brelse(orig_dx_leaves[i]);
+			if (new_dx_leaves)
+				brelse(new_dx_leaves[i]);
+		}
+		kfree(orig_dx_leaves);
+		kfree(new_dx_leaves);
+	}
+
+	if (meta_ac)
+		ocfs2_free_alloc_context(meta_ac);
+	if (data_ac)
+		ocfs2_free_alloc_context(data_ac);
+
+	kfree(tmp_dx_leaf);
+	return ret;
+}
+
+static int ocfs2_find_dir_space_dx(struct ocfs2_super *osb, struct inode *dir,
+				   struct buffer_head *di_bh,
+				   struct buffer_head *dx_root_bh,
+				   const char *name, int namelen,
+				   struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret, rebalanced = 0;
+	struct ocfs2_dx_root_block *dx_root;
+	struct buffer_head *dx_leaf_bh = NULL;
+	struct ocfs2_dx_leaf *dx_leaf;
+	u64 blkno;
+	u32 leaf_cpos;
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+
+restart_search:
+	ret = ocfs2_dx_dir_lookup(dir, &dx_root->dr_list, &lookup->dl_hinfo,
+				  &leaf_cpos, &blkno);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_read_dx_leaf(dir, blkno, &dx_leaf_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
+
+	if (le16_to_cpu(dx_leaf->dl_list.de_num_used) >=
+	    le16_to_cpu(dx_leaf->dl_list.de_count)) {
+		if (rebalanced) {
+			/*
+			 * Rebalancing should have provided us with
+			 * space in an appropriate leaf.
+			 *
+			 * XXX: Is this an abnormal condition then?
+			 * Should we print a message here?
+			 */
+			ret = -ENOSPC;
+			goto out;
+		}
+
+		ret = ocfs2_dx_dir_rebalance(osb, dir, dx_root_bh, dx_leaf_bh,
+					     &lookup->dl_hinfo, leaf_cpos,
+					     blkno);
+		if (ret) {
+			if (ret != -ENOSPC)
+				mlog_errno(ret);
+			goto out;
+		}
+
+		/*
+		 * Restart the lookup. The rebalance might have
+		 * changed which block our item fits into. Mark our
+		 * progress, so we only execute this once.
+		 */
+		brelse(dx_leaf_bh);
+		dx_leaf_bh = NULL;
+		rebalanced = 1;
+		goto restart_search;
+	}
+
+	lookup->dl_dx_leaf_bh = dx_leaf_bh;
+	dx_leaf_bh = NULL;
+
+out:
+	brelse(dx_leaf_bh);
+	return ret;
+}
+
+static int ocfs2_search_dx_free_list(struct inode *dir,
+				     struct buffer_head *dx_root_bh,
+				     int namelen,
+				     struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret = -ENOSPC;
+	struct buffer_head *leaf_bh = NULL, *prev_leaf_bh = NULL;
+	struct ocfs2_dir_block_trailer *db;
+	u64 next_block;
+	int rec_len = OCFS2_DIR_REC_LEN(namelen);
+	struct ocfs2_dx_root_block *dx_root;
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	next_block = le64_to_cpu(dx_root->dr_free_blk);
+
+	while (next_block) {
+		brelse(prev_leaf_bh);
+		prev_leaf_bh = leaf_bh;
+		leaf_bh = NULL;
+
+		ret = ocfs2_read_dir_block_direct(dir, next_block, &leaf_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		db = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
+		if (rec_len <= le16_to_cpu(db->db_free_rec_len)) {
+			lookup->dl_leaf_bh = leaf_bh;
+			lookup->dl_prev_leaf_bh = prev_leaf_bh;
+			leaf_bh = NULL;
+			prev_leaf_bh = NULL;
+			break;
+		}
+
+		next_block = le64_to_cpu(db->db_free_next);
+	}
+
+	if (!next_block)
+		ret = -ENOSPC;
+
+out:
+
+	brelse(leaf_bh);
+	brelse(prev_leaf_bh);
+	return ret;
+}
+
+static int ocfs2_expand_inline_dx_root(struct inode *dir,
+				       struct buffer_head *dx_root_bh)
+{
+	int ret, num_dx_leaves, i, j, did_quota = 0;
+	struct buffer_head **dx_leaves = NULL;
+	struct ocfs2_extent_tree et;
+	u64 insert_blkno;
+	struct ocfs2_alloc_context *data_ac = NULL;
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	handle_t *handle = NULL;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dx_entry_list *entry_list;
+	struct ocfs2_dx_entry *dx_entry;
+	struct ocfs2_dx_leaf *target_leaf;
+
+	ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
+	if (!dx_leaves) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	handle = ocfs2_start_trans(osb, ocfs2_calc_dxi_expand_credits(osb->sb));
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (vfs_dq_alloc_space_nodirty(dir,
+				       ocfs2_clusters_to_bytes(osb->sb, 1))) {
+		ret = -EDQUOT;
+		goto out_commit;
+	}
+	did_quota = 1;
+
+	/*
+	 * We do this up front, before the allocation, so that a
+	 * failure to add the dx_root_bh to the journal won't result
+	 * us losing clusters.
+	 */
+	ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, dx_leaves,
+					 num_dx_leaves, &insert_blkno);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	/*
+	 * Transfer the entries from our dx_root into the appropriate
+	 * block
+	 */
+	dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
+	entry_list = &dx_root->dr_entries;
+
+	for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
+		dx_entry = &entry_list->de_entries[i];
+
+		j = __ocfs2_dx_dir_hash_idx(osb,
+					    le32_to_cpu(dx_entry->dx_minor_hash));
+		target_leaf = (struct ocfs2_dx_leaf *)dx_leaves[j]->b_data;
+
+		ocfs2_dx_dir_leaf_insert_tail(target_leaf, dx_entry);
+
+		/* Each leaf has been passed to the journal already
+		 * via __ocfs2_dx_dir_new_cluster() */
+	}
+
+	dx_root->dr_flags &= ~OCFS2_DX_FLAG_INLINE;
+	memset(&dx_root->dr_list, 0, osb->sb->s_blocksize -
+	       offsetof(struct ocfs2_dx_root_block, dr_list));
+	dx_root->dr_list.l_count =
+		cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
+
+	/* This should never fail considering we start with an empty
+	 * dx_root. */
+	ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
+	ret = ocfs2_insert_extent(osb, handle, dir, &et, 0,
+				  insert_blkno, 1, 0, NULL);
+	if (ret)
+		mlog_errno(ret);
+	did_quota = 0;
+
+	ocfs2_journal_dirty(handle, dx_root_bh);
+
+out_commit:
+	if (ret < 0 && did_quota)
+		vfs_dq_free_space_nodirty(dir,
+					  ocfs2_clusters_to_bytes(dir->i_sb, 1));
+
+	ocfs2_commit_trans(osb, handle);
+
+out:
+	if (data_ac)
+		ocfs2_free_alloc_context(data_ac);
+
+	if (dx_leaves) {
+		for (i = 0; i < num_dx_leaves; i++)
+			brelse(dx_leaves[i]);
+		kfree(dx_leaves);
+	}
+	return ret;
+}
+
+static int ocfs2_inline_dx_has_space(struct buffer_head *dx_root_bh)
+{
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dx_entry_list *entry_list;
+
+	dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
+	entry_list = &dx_root->dr_entries;
+
+	if (le16_to_cpu(entry_list->de_num_used) >=
+	    le16_to_cpu(entry_list->de_count))
+		return -ENOSPC;
+
+	return 0;
+}
+
+static int ocfs2_prepare_dx_dir_for_insert(struct inode *dir,
+					   struct buffer_head *di_bh,
+					   const char *name,
+					   int namelen,
+					   struct ocfs2_dir_lookup_result *lookup)
+{
+	int ret, free_dx_root = 1;
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	struct buffer_head *dx_root_bh = NULL;
+	struct buffer_head *leaf_bh = NULL;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	struct ocfs2_dx_root_block *dx_root;
+
+	ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+	if (le32_to_cpu(dx_root->dr_num_entries) == OCFS2_DX_ENTRIES_MAX) {
+		ret = -ENOSPC;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (ocfs2_dx_root_inline(dx_root)) {
+		ret = ocfs2_inline_dx_has_space(dx_root_bh);
+
+		if (ret == 0)
+			goto search_el;
+
+		/*
+		 * We ran out of room in the root block. Expand it to
+		 * an extent, then allow ocfs2_find_dir_space_dx to do
+		 * the rest.
+		 */
+		ret = ocfs2_expand_inline_dx_root(dir, dx_root_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+	}
+
+	/*
+	 * Insert preparation for an indexed directory is split into two
+	 * steps. The call to find_dir_space_dx reserves room in the index for
+	 * an additional item. If we run out of space there, it's a real error
+	 * we can't continue on.
+	 */
+	ret = ocfs2_find_dir_space_dx(osb, dir, di_bh, dx_root_bh, name,
+				      namelen, lookup);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+search_el:
+	/*
+	 * Next, we need to find space in the unindexed tree. This call
+	 * searches using the free space linked list. If the unindexed tree
+	 * lacks sufficient space, we'll expand it below. The expansion code
+	 * is smart enough to add any new blocks to the free space list.
+	 */
+	ret = ocfs2_search_dx_free_list(dir, dx_root_bh, namelen, lookup);
+	if (ret && ret != -ENOSPC) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	/* Do this up here - ocfs2_extend_dir might need the dx_root */
+	lookup->dl_dx_root_bh = dx_root_bh;
+	free_dx_root = 0;
+
+	if (ret == -ENOSPC) {
+		ret = ocfs2_extend_dir(osb, dir, di_bh, 1, lookup, &leaf_bh);
+
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		/*
+		 * We make the assumption here that new leaf blocks are added
+		 * to the front of our free list.
+		 */
+		lookup->dl_prev_leaf_bh = NULL;
+		lookup->dl_leaf_bh = leaf_bh;
+	}
+
+out:
+	if (free_dx_root)
+		brelse(dx_root_bh);
+	return ret;
+}
+
+/*
+ * Get a directory ready for insert. Any directory allocation required
+ * happens here. Success returns zero, and enough context in the dir
+ * lookup result that ocfs2_add_entry() will be able complete the task
+ * with minimal performance impact.
+ */
 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 				 struct inode *dir,
 				 struct buffer_head *parent_fe_bh,
 				 const char *name,
 				 int namelen,
-				 struct buffer_head **ret_de_bh)
+				 struct ocfs2_dir_lookup_result *lookup)
 {
 	int ret;
 	unsigned int blocks_wanted = 1;
@@ -1984,14 +4367,34 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 	mlog(0, "getting ready to insert namelen %d into dir %llu\n",
 	     namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 
-	*ret_de_bh = NULL;
-
 	if (!namelen) {
 		ret = -EINVAL;
 		mlog_errno(ret);
 		goto out;
 	}
 
+	/*
+	 * Do this up front to reduce confusion.
+	 *
+	 * The directory might start inline, then be turned into an
+	 * indexed one, in which case we'd need to hash deep inside
+	 * ocfs2_find_dir_space_id(). Since
+	 * ocfs2_prepare_dx_dir_for_insert() also needs this hash
+	 * done, there seems no point in spreading out the calls. We
+	 * can optimize away the case where the file system doesn't
+	 * support indexing.
+	 */
+	if (ocfs2_supports_indexed_dirs(osb))
+		ocfs2_dx_dir_name_hash(dir, name, namelen, &lookup->dl_hinfo);
+
+	if (ocfs2_dir_indexed(dir)) {
+		ret = ocfs2_prepare_dx_dir_for_insert(dir, parent_fe_bh,
+						      name, namelen, lookup);
+		if (ret)
+			mlog_errno(ret);
+		goto out;
+	}
+
 	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 		ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
 					      namelen, &bh, &blocks_wanted);
@@ -2010,7 +4413,7 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 		BUG_ON(bh);
 
 		ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
-				       &bh);
+				       lookup, &bh);
 		if (ret) {
 			if (ret != -ENOSPC)
 				mlog_errno(ret);
@@ -2020,9 +4423,154 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 		BUG_ON(!bh);
 	}
 
-	*ret_de_bh = bh;
+	lookup->dl_leaf_bh = bh;
 	bh = NULL;
 out:
 	brelse(bh);
 	return ret;
 }
+
+static int ocfs2_dx_dir_remove_index(struct inode *dir,
+				     struct buffer_head *di_bh,
+				     struct buffer_head *dx_root_bh)
+{
+	int ret;
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	struct ocfs2_dx_root_block *dx_root;
+	struct inode *dx_alloc_inode = NULL;
+	struct buffer_head *dx_alloc_bh = NULL;
+	handle_t *handle;
+	u64 blk;
+	u16 bit;
+	u64 bg_blkno;
+
+	dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
+
+	dx_alloc_inode = ocfs2_get_system_file_inode(osb,
+					EXTENT_ALLOC_SYSTEM_INODE,
+					le16_to_cpu(dx_root->dr_suballoc_slot));
+	if (!dx_alloc_inode) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+	mutex_lock(&dx_alloc_inode->i_mutex);
+
+	ret = ocfs2_inode_lock(dx_alloc_inode, &dx_alloc_bh, 1);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_mutex;
+	}
+
+	handle = ocfs2_start_trans(osb, OCFS2_DX_ROOT_REMOVE_CREDITS);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out_unlock;
+	}
+
+	ret = ocfs2_journal_access_di(handle, dir, di_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL;
+	di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
+	di->i_dx_root = cpu_to_le64(0ULL);
+
+	ocfs2_journal_dirty(handle, di_bh);
+
+	blk = le64_to_cpu(dx_root->dr_blkno);
+	bit = le16_to_cpu(dx_root->dr_suballoc_bit);
+	bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+	ret = ocfs2_free_suballoc_bits(handle, dx_alloc_inode, dx_alloc_bh,
+				       bit, bg_blkno, 1);
+	if (ret)
+		mlog_errno(ret);
+
+out_commit:
+	ocfs2_commit_trans(osb, handle);
+
+out_unlock:
+	ocfs2_inode_unlock(dx_alloc_inode, 1);
+
+out_mutex:
+	mutex_unlock(&dx_alloc_inode->i_mutex);
+	brelse(dx_alloc_bh);
+out:
+	iput(dx_alloc_inode);
+	return ret;
+}
+
+int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh)
+{
+	int ret;
+	unsigned int uninitialized_var(clen);
+	u32 major_hash = UINT_MAX, p_cpos, uninitialized_var(cpos);
+	u64 uninitialized_var(blkno);
+	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	struct buffer_head *dx_root_bh = NULL;
+	struct ocfs2_dx_root_block *dx_root;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	struct ocfs2_cached_dealloc_ctxt dealloc;
+	struct ocfs2_extent_tree et;
+
+	ocfs2_init_dealloc_ctxt(&dealloc);
+
+	if (!ocfs2_dir_indexed(dir))
+		return 0;
+
+	ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
+
+	if (ocfs2_dx_root_inline(dx_root))
+		goto remove_index;
+
+	ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
+
+	/* XXX: What if dr_clusters is too large? */
+	while (le32_to_cpu(dx_root->dr_clusters)) {
+		ret = ocfs2_dx_dir_lookup_rec(dir, &dx_root->dr_list,
+					      major_hash, &cpos, &blkno, &clen);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		p_cpos = ocfs2_blocks_to_clusters(dir->i_sb, blkno);
+
+		ret = ocfs2_remove_btree_range(dir, &et, cpos, p_cpos, clen,
+					       &dealloc);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+
+		if (cpos == 0)
+			break;
+
+		major_hash = cpos - 1;
+	}
+
+remove_index:
+	ret = ocfs2_dx_dir_remove_index(dir, di_bh, dx_root_bh);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ocfs2_remove_from_cache(dir, dx_root_bh);
+out:
+	ocfs2_schedule_truncate_log_flush(osb, 1);
+	ocfs2_run_deallocs(osb, &dealloc);
+
+	brelse(dx_root_bh);
+	return ret;
+}
diff --git a/fs/ocfs2/dir.h b/fs/ocfs2/dir.h
index c511e2e18e9..e683f3deb64 100644
--- a/fs/ocfs2/dir.h
+++ b/fs/ocfs2/dir.h
@@ -26,44 +26,70 @@
 #ifndef OCFS2_DIR_H
 #define OCFS2_DIR_H
 
-struct buffer_head *ocfs2_find_entry(const char *name,
-				     int namelen,
-				     struct inode *dir,
-				     struct ocfs2_dir_entry **res_dir);
+struct ocfs2_dx_hinfo {
+	u32	major_hash;
+	u32	minor_hash;
+};
+
+struct ocfs2_dir_lookup_result {
+	struct buffer_head		*dl_leaf_bh;	/* Unindexed leaf
+							 * block */
+	struct ocfs2_dir_entry		*dl_entry;	/* Target dirent in
+							 * unindexed leaf */
+
+	struct buffer_head		*dl_dx_root_bh;	/* Root of indexed
+							 * tree */
+
+	struct buffer_head		*dl_dx_leaf_bh;	/* Indexed leaf block */
+	struct ocfs2_dx_entry		*dl_dx_entry;	/* Target dx_entry in
+							 * indexed leaf */
+	struct ocfs2_dx_hinfo		dl_hinfo;	/* Name hash results */
+
+	struct buffer_head		*dl_prev_leaf_bh;/* Previous entry in
+							  * dir free space
+							  * list. NULL if
+							  * previous entry is
+							  * dx root block. */
+};
+
+void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
+
+int ocfs2_find_entry(const char *name, int namelen,
+		     struct inode *dir,
+		     struct ocfs2_dir_lookup_result *lookup);
 int ocfs2_delete_entry(handle_t *handle,
 		       struct inode *dir,
-		       struct ocfs2_dir_entry *de_del,
-		       struct buffer_head *bh);
+		       struct ocfs2_dir_lookup_result *res);
 int __ocfs2_add_entry(handle_t *handle,
 		      struct inode *dir,
 		      const char *name, int namelen,
 		      struct inode *inode, u64 blkno,
 		      struct buffer_head *parent_fe_bh,
-		      struct buffer_head *insert_bh);
+		      struct ocfs2_dir_lookup_result *lookup);
 static inline int ocfs2_add_entry(handle_t *handle,
 				  struct dentry *dentry,
 				  struct inode *inode, u64 blkno,
 				  struct buffer_head *parent_fe_bh,
-				  struct buffer_head *insert_bh)
+				  struct ocfs2_dir_lookup_result *lookup)
 {
 	return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
 				 dentry->d_name.name, dentry->d_name.len,
-				 inode, blkno, parent_fe_bh, insert_bh);
+				 inode, blkno, parent_fe_bh, lookup);
 }
 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
-		       struct buffer_head *de_bh, struct ocfs2_dir_entry *de,
+		       struct ocfs2_dir_lookup_result *res,
 		       struct inode *new_entry_inode);
 
 int ocfs2_check_dir_for_entry(struct inode *dir,
 			      const char *name,
 			      int namelen);
 int ocfs2_empty_dir(struct inode *inode);
+
 int ocfs2_find_files_on_disk(const char *name,
 			     int namelen,
 			     u64 *blkno,
 			     struct inode *inode,
-			     struct buffer_head **dirent_bh,
-			     struct ocfs2_dir_entry **dirent);
+			     struct ocfs2_dir_lookup_result *res);
 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
 			       int namelen, u64 *blkno);
 int ocfs2_readdir(struct file *filp, void *dirent, filldir_t filldir);
@@ -74,14 +100,17 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 				 struct buffer_head *parent_fe_bh,
 				 const char *name,
 				 int namelen,
-				 struct buffer_head **ret_de_bh);
+				 struct ocfs2_dir_lookup_result *lookup);
 struct ocfs2_alloc_context;
 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 		       handle_t *handle,
 		       struct inode *parent,
 		       struct inode *inode,
 		       struct buffer_head *fe_bh,
-		       struct ocfs2_alloc_context *data_ac);
+		       struct ocfs2_alloc_context *data_ac,
+		       struct ocfs2_alloc_context *meta_ac);
+
+int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
 
 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
 							    void *data);
diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index bb53714813a..0102be35980 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -52,16 +52,12 @@
 enum dlm_mle_type {
 	DLM_MLE_BLOCK,
 	DLM_MLE_MASTER,
-	DLM_MLE_MIGRATION
-};
-
-struct dlm_lock_name {
-	u8 len;
-	u8 name[DLM_LOCKID_NAME_MAX];
+	DLM_MLE_MIGRATION,
+	DLM_MLE_NUM_TYPES
 };
 
 struct dlm_master_list_entry {
-	struct list_head list;
+	struct hlist_node master_hash_node;
 	struct list_head hb_events;
 	struct dlm_ctxt *dlm;
 	spinlock_t spinlock;
@@ -78,10 +74,10 @@ struct dlm_master_list_entry {
 	enum dlm_mle_type type;
 	struct o2hb_callback_func mle_hb_up;
 	struct o2hb_callback_func mle_hb_down;
-	union {
-		struct dlm_lock_resource *res;
-		struct dlm_lock_name name;
-	} u;
+	struct dlm_lock_resource *mleres;
+	unsigned char mname[DLM_LOCKID_NAME_MAX];
+	unsigned int mnamelen;
+	unsigned int mnamehash;
 };
 
 enum dlm_ast_type {
@@ -151,13 +147,14 @@ struct dlm_ctxt
 	unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
 	struct dlm_recovery_ctxt reco;
 	spinlock_t master_lock;
-	struct list_head master_list;
+	struct hlist_head **master_hash;
 	struct list_head mle_hb_events;
 
 	/* these give a really vague idea of the system load */
-	atomic_t local_resources;
-	atomic_t remote_resources;
-	atomic_t unknown_resources;
+	atomic_t mle_tot_count[DLM_MLE_NUM_TYPES];
+	atomic_t mle_cur_count[DLM_MLE_NUM_TYPES];
+	atomic_t res_tot_count;
+	atomic_t res_cur_count;
 
 	struct dlm_debug_ctxt *dlm_debug_ctxt;
 	struct dentry *dlm_debugfs_subroot;
@@ -195,6 +192,13 @@ static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned
 	return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
 }
 
+static inline struct hlist_head *dlm_master_hash(struct dlm_ctxt *dlm,
+						 unsigned i)
+{
+	return dlm->master_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] +
+			(i % DLM_BUCKETS_PER_PAGE);
+}
+
 /* these keventd work queue items are for less-frequently
  * called functions that cannot be directly called from the
  * net message handlers for some reason, usually because
@@ -848,9 +852,7 @@ struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
 					      unsigned int len);
 
 int dlm_is_host_down(int errno);
-void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
-			      struct dlm_lock_resource *res,
-			      u8 owner);
+
 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 						 const char *lockid,
 						 int namelen,
@@ -1008,6 +1010,9 @@ static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
 					  DLM_LOCK_RES_MIGRATING));
 }
 
+void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
+void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
+
 /* create/destroy slab caches */
 int dlm_init_master_caches(void);
 void dlm_destroy_master_caches(void);
@@ -1110,6 +1115,23 @@ static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
 	return bit;
 }
 
+static inline void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
+					 struct dlm_lock_resource *res,
+					 u8 owner)
+{
+	assert_spin_locked(&res->spinlock);
+
+	res->owner = owner;
+}
 
+static inline void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
+					    struct dlm_lock_resource *res,
+					    u8 owner)
+{
+	assert_spin_locked(&res->spinlock);
+
+	if (owner != res->owner)
+		dlm_set_lockres_owner(dlm, res, owner);
+}
 
 #endif /* DLMCOMMON_H */
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index b32f60a5acf..df52f706f66 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -287,18 +287,8 @@ static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 {
 	int out = 0;
-	unsigned int namelen;
-	const char *name;
 	char *mle_type;
 
-	if (mle->type != DLM_MLE_MASTER) {
-		namelen = mle->u.name.len;
-		name = mle->u.name.name;
-	} else {
-		namelen = mle->u.res->lockname.len;
-		name = mle->u.res->lockname.name;
-	}
-
 	if (mle->type == DLM_MLE_BLOCK)
 		mle_type = "BLK";
 	else if (mle->type == DLM_MLE_MASTER)
@@ -306,7 +296,7 @@ static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 	else
 		mle_type = "MIG";
 
-	out += stringify_lockname(name, namelen, buf + out, len - out);
+	out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
 	out += snprintf(buf + out, len - out,
 			"\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
 			mle_type, mle->master, mle->new_master,
@@ -501,23 +491,33 @@ static struct file_operations debug_purgelist_fops = {
 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 {
 	struct dlm_master_list_entry *mle;
-	int out = 0;
-	unsigned long total = 0;
+	struct hlist_head *bucket;
+	struct hlist_node *list;
+	int i, out = 0;
+	unsigned long total = 0, longest = 0, bktcnt;
 
 	out += snprintf(db->buf + out, db->len - out,
 			"Dumping MLEs for Domain: %s\n", dlm->name);
 
 	spin_lock(&dlm->master_lock);
-	list_for_each_entry(mle, &dlm->master_list, list) {
-		++total;
-		if (db->len - out < 200)
-			continue;
-		out += dump_mle(mle, db->buf + out, db->len - out);
+	for (i = 0; i < DLM_HASH_BUCKETS; i++) {
+		bucket = dlm_master_hash(dlm, i);
+		hlist_for_each(list, bucket) {
+			mle = hlist_entry(list, struct dlm_master_list_entry,
+					  master_hash_node);
+			++total;
+			++bktcnt;
+			if (db->len - out < 200)
+				continue;
+			out += dump_mle(mle, db->buf + out, db->len - out);
+		}
+		longest = max(longest, bktcnt);
+		bktcnt = 0;
 	}
 	spin_unlock(&dlm->master_lock);
 
 	out += snprintf(db->buf + out, db->len - out,
-			"Total on list: %ld\n", total);
+			"Total: %ld, Longest: %ld\n", total, longest);
 	return out;
 }
 
@@ -756,12 +756,8 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 	int out = 0;
 	struct dlm_reco_node_data *node;
 	char *state;
-	int lres, rres, ures, tres;
-
-	lres = atomic_read(&dlm->local_resources);
-	rres = atomic_read(&dlm->remote_resources);
-	ures = atomic_read(&dlm->unknown_resources);
-	tres = lres + rres + ures;
+	int cur_mles = 0, tot_mles = 0;
+	int i;
 
 	spin_lock(&dlm->spinlock);
 
@@ -804,21 +800,48 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 				 db->buf + out, db->len - out);
 	out += snprintf(db->buf + out, db->len - out, "\n");
 
-	/* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
+	/* Lock Resources: xxx (xxx) */
+	out += snprintf(db->buf + out, db->len - out,
+			"Lock Resources: %d (%d)\n",
+			atomic_read(&dlm->res_cur_count),
+			atomic_read(&dlm->res_tot_count));
+
+	for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
+		tot_mles += atomic_read(&dlm->mle_tot_count[i]);
+
+	for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
+		cur_mles += atomic_read(&dlm->mle_cur_count[i]);
+
+	/* MLEs: xxx (xxx) */
+	out += snprintf(db->buf + out, db->len - out,
+			"MLEs: %d (%d)\n", cur_mles, tot_mles);
+
+	/*  Blocking: xxx (xxx) */
+	out += snprintf(db->buf + out, db->len - out,
+			"  Blocking: %d (%d)\n",
+			atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
+			atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
+
+	/*  Mastery: xxx (xxx) */
+	out += snprintf(db->buf + out, db->len - out,
+			"  Mastery: %d (%d)\n",
+			atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
+			atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
+
+	/*  Migration: xxx (xxx) */
 	out += snprintf(db->buf + out, db->len - out,
-			"Mastered Resources Total: %d  Locally: %d  "
-			"Remotely: %d  Unknown: %d\n",
-			tres, lres, rres, ures);
+			"  Migration: %d (%d)\n",
+			atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
+			atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
 
 	/* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 	out += snprintf(db->buf + out, db->len - out,
 			"Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
-			"PendingBASTs=%s  Master=%s\n",
+			"PendingBASTs=%s\n",
 			(list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 			(list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 			(list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
-			(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
-			(list_empty(&dlm->master_list) ? "Empty" : "InUse"));
+			(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
 
 	/* Purge Count: xxx  Refs: xxx */
 	out += snprintf(db->buf + out, db->len - out,
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index d8d578f4561..4d9e6b288dd 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -304,6 +304,9 @@ static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
 	if (dlm->lockres_hash)
 		dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
 
+	if (dlm->master_hash)
+		dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
+
 	if (dlm->name)
 		kfree(dlm->name);
 
@@ -1534,12 +1537,27 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
 	for (i = 0; i < DLM_HASH_BUCKETS; i++)
 		INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
 
+	dlm->master_hash = (struct hlist_head **)
+				dlm_alloc_pagevec(DLM_HASH_PAGES);
+	if (!dlm->master_hash) {
+		mlog_errno(-ENOMEM);
+		dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
+		kfree(dlm->name);
+		kfree(dlm);
+		dlm = NULL;
+		goto leave;
+	}
+
+	for (i = 0; i < DLM_HASH_BUCKETS; i++)
+		INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
+
 	strcpy(dlm->name, domain);
 	dlm->key = key;
 	dlm->node_num = o2nm_this_node();
 
 	ret = dlm_create_debugfs_subroot(dlm);
 	if (ret < 0) {
+		dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
 		dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
 		kfree(dlm->name);
 		kfree(dlm);
@@ -1579,7 +1597,6 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
 	init_waitqueue_head(&dlm->reco.event);
 	init_waitqueue_head(&dlm->ast_wq);
 	init_waitqueue_head(&dlm->migration_wq);
-	INIT_LIST_HEAD(&dlm->master_list);
 	INIT_LIST_HEAD(&dlm->mle_hb_events);
 
 	dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
@@ -1587,9 +1604,13 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
 
 	dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
 	dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
-	atomic_set(&dlm->local_resources, 0);
-	atomic_set(&dlm->remote_resources, 0);
-	atomic_set(&dlm->unknown_resources, 0);
+
+	atomic_set(&dlm->res_tot_count, 0);
+	atomic_set(&dlm->res_cur_count, 0);
+	for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
+		atomic_set(&dlm->mle_tot_count[i], 0);
+		atomic_set(&dlm->mle_cur_count[i], 0);
+	}
 
 	spin_lock_init(&dlm->work_lock);
 	INIT_LIST_HEAD(&dlm->work_list);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 0a281394785..f8b653fcd4d 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -73,22 +73,13 @@ static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
 				const char *name,
 				unsigned int namelen)
 {
-	struct dlm_lock_resource *res;
-
 	if (dlm != mle->dlm)
 		return 0;
 
-	if (mle->type == DLM_MLE_BLOCK ||
-	    mle->type == DLM_MLE_MIGRATION) {
-		if (namelen != mle->u.name.len ||
-    	    	    memcmp(name, mle->u.name.name, namelen)!=0)
-			return 0;
-	} else {
-		res = mle->u.res;
-		if (namelen != res->lockname.len ||
-		    memcmp(res->lockname.name, name, namelen) != 0)
-			return 0;
-	}
+	if (namelen != mle->mnamelen ||
+	    memcmp(name, mle->mname, namelen) != 0)
+		return 0;
+
 	return 1;
 }
 
@@ -283,7 +274,7 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
 
 	mle->dlm = dlm;
 	mle->type = type;
-	INIT_LIST_HEAD(&mle->list);
+	INIT_HLIST_NODE(&mle->master_hash_node);
 	INIT_LIST_HEAD(&mle->hb_events);
 	memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
 	spin_lock_init(&mle->spinlock);
@@ -295,19 +286,27 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
 	mle->new_master = O2NM_MAX_NODES;
 	mle->inuse = 0;
 
+	BUG_ON(mle->type != DLM_MLE_BLOCK &&
+	       mle->type != DLM_MLE_MASTER &&
+	       mle->type != DLM_MLE_MIGRATION);
+
 	if (mle->type == DLM_MLE_MASTER) {
 		BUG_ON(!res);
-		mle->u.res = res;
-	} else if (mle->type == DLM_MLE_BLOCK) {
-		BUG_ON(!name);
-		memcpy(mle->u.name.name, name, namelen);
-		mle->u.name.len = namelen;
-	} else /* DLM_MLE_MIGRATION */ {
+		mle->mleres = res;
+		memcpy(mle->mname, res->lockname.name, res->lockname.len);
+		mle->mnamelen = res->lockname.len;
+		mle->mnamehash = res->lockname.hash;
+	} else {
 		BUG_ON(!name);
-		memcpy(mle->u.name.name, name, namelen);
-		mle->u.name.len = namelen;
+		mle->mleres = NULL;
+		memcpy(mle->mname, name, namelen);
+		mle->mnamelen = namelen;
+		mle->mnamehash = dlm_lockid_hash(name, namelen);
 	}
 
+	atomic_inc(&dlm->mle_tot_count[mle->type]);
+	atomic_inc(&dlm->mle_cur_count[mle->type]);
+
 	/* copy off the node_map and register hb callbacks on our copy */
 	memcpy(mle->node_map, dlm->domain_map, sizeof(mle->node_map));
 	memcpy(mle->vote_map, dlm->domain_map, sizeof(mle->vote_map));
@@ -318,6 +317,24 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
 	__dlm_mle_attach_hb_events(dlm, mle);
 }
 
+void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
+{
+	assert_spin_locked(&dlm->spinlock);
+	assert_spin_locked(&dlm->master_lock);
+
+	if (!hlist_unhashed(&mle->master_hash_node))
+		hlist_del_init(&mle->master_hash_node);
+}
+
+void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
+{
+	struct hlist_head *bucket;
+
+	assert_spin_locked(&dlm->master_lock);
+
+	bucket = dlm_master_hash(dlm, mle->mnamehash);
+	hlist_add_head(&mle->master_hash_node, bucket);
+}
 
 /* returns 1 if found, 0 if not */
 static int dlm_find_mle(struct dlm_ctxt *dlm,
@@ -325,10 +342,17 @@ static int dlm_find_mle(struct dlm_ctxt *dlm,
 			char *name, unsigned int namelen)
 {
 	struct dlm_master_list_entry *tmpmle;
+	struct hlist_head *bucket;
+	struct hlist_node *list;
+	unsigned int hash;
 
 	assert_spin_locked(&dlm->master_lock);
 
-	list_for_each_entry(tmpmle, &dlm->master_list, list) {
+	hash = dlm_lockid_hash(name, namelen);
+	bucket = dlm_master_hash(dlm, hash);
+	hlist_for_each(list, bucket) {
+		tmpmle = hlist_entry(list, struct dlm_master_list_entry,
+				     master_hash_node);
 		if (!dlm_mle_equal(dlm, tmpmle, name, namelen))
 			continue;
 		dlm_get_mle(tmpmle);
@@ -408,24 +432,20 @@ static void dlm_mle_release(struct kref *kref)
 	mle = container_of(kref, struct dlm_master_list_entry, mle_refs);
 	dlm = mle->dlm;
 
-	if (mle->type != DLM_MLE_MASTER) {
-		mlog(0, "calling mle_release for %.*s, type %d\n",
-		     mle->u.name.len, mle->u.name.name, mle->type);
-	} else {
-		mlog(0, "calling mle_release for %.*s, type %d\n",
-		     mle->u.res->lockname.len,
-		     mle->u.res->lockname.name, mle->type);
-	}
 	assert_spin_locked(&dlm->spinlock);
 	assert_spin_locked(&dlm->master_lock);
 
+	mlog(0, "Releasing mle for %.*s, type %d\n", mle->mnamelen, mle->mname,
+	     mle->type);
+
 	/* remove from list if not already */
-	if (!list_empty(&mle->list))
-		list_del_init(&mle->list);
+	__dlm_unlink_mle(dlm, mle);
 
 	/* detach the mle from the domain node up/down events */
 	__dlm_mle_detach_hb_events(dlm, mle);
 
+	atomic_dec(&dlm->mle_cur_count[mle->type]);
+
 	/* NOTE: kfree under spinlock here.
 	 * if this is bad, we can move this to a freelist. */
 	kmem_cache_free(dlm_mle_cache, mle);
@@ -465,43 +485,6 @@ void dlm_destroy_master_caches(void)
 		kmem_cache_destroy(dlm_lockres_cache);
 }
 
-static void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
-				  struct dlm_lock_resource *res,
-				  u8 owner)
-{
-	assert_spin_locked(&res->spinlock);
-
-	mlog_entry("%.*s, %u\n", res->lockname.len, res->lockname.name, owner);
-
-	if (owner == dlm->node_num)
-		atomic_inc(&dlm->local_resources);
-	else if (owner == DLM_LOCK_RES_OWNER_UNKNOWN)
-		atomic_inc(&dlm->unknown_resources);
-	else
-		atomic_inc(&dlm->remote_resources);
-
-	res->owner = owner;
-}
-
-void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
-			      struct dlm_lock_resource *res, u8 owner)
-{
-	assert_spin_locked(&res->spinlock);
-
-	if (owner == res->owner)
-		return;
-
-	if (res->owner == dlm->node_num)
-		atomic_dec(&dlm->local_resources);
-	else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN)
-		atomic_dec(&dlm->unknown_resources);
-	else
-		atomic_dec(&dlm->remote_resources);
-
-	dlm_set_lockres_owner(dlm, res, owner);
-}
-
-
 static void dlm_lockres_release(struct kref *kref)
 {
 	struct dlm_lock_resource *res;
@@ -527,6 +510,8 @@ static void dlm_lockres_release(struct kref *kref)
 	}
 	spin_unlock(&dlm->track_lock);
 
+	atomic_dec(&dlm->res_cur_count);
+
 	dlm_put(dlm);
 
 	if (!hlist_unhashed(&res->hash_node) ||
@@ -607,6 +592,9 @@ static void dlm_init_lockres(struct dlm_ctxt *dlm,
 
 	kref_init(&res->refs);
 
+	atomic_inc(&dlm->res_tot_count);
+	atomic_inc(&dlm->res_cur_count);
+
 	/* just for consistency */
 	spin_lock(&res->spinlock);
 	dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN);
@@ -843,7 +831,7 @@ lookup:
 		alloc_mle = NULL;
 		dlm_init_mle(mle, DLM_MLE_MASTER, dlm, res, NULL, 0);
 		set_bit(dlm->node_num, mle->maybe_map);
-		list_add(&mle->list, &dlm->master_list);
+		__dlm_insert_mle(dlm, mle);
 
 		/* still holding the dlm spinlock, check the recovery map
 		 * to see if there are any nodes that still need to be 
@@ -1270,7 +1258,7 @@ static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
 						     res->lockname.len,
 						     res->lockname.name);
 						mle->type = DLM_MLE_MASTER;
-						mle->u.res = res;
+						mle->mleres = res;
 					}
 				}
 			}
@@ -1315,14 +1303,8 @@ static int dlm_do_master_request(struct dlm_lock_resource *res,
 
 	BUG_ON(mle->type == DLM_MLE_MIGRATION);
 
-	if (mle->type != DLM_MLE_MASTER) {
-		request.namelen = mle->u.name.len;
-		memcpy(request.name, mle->u.name.name, request.namelen);
-	} else {
-		request.namelen = mle->u.res->lockname.len;
-		memcpy(request.name, mle->u.res->lockname.name,
-			request.namelen);
-	}
+	request.namelen = (u8)mle->mnamelen;
+	memcpy(request.name, mle->mname, request.namelen);
 
 again:
 	ret = o2net_send_message(DLM_MASTER_REQUEST_MSG, dlm->key, &request,
@@ -1575,7 +1557,7 @@ way_up_top:
 		// "add the block.\n");
 		dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL, name, namelen);
 		set_bit(request->node_idx, mle->maybe_map);
-		list_add(&mle->list, &dlm->master_list);
+		__dlm_insert_mle(dlm, mle);
 		response = DLM_MASTER_RESP_NO;
 	} else {
 		// mlog(0, "mle was found\n");
@@ -1967,7 +1949,7 @@ ok:
 			     assert->node_idx, rr, extra_ref, mle->inuse);
 			dlm_print_one_mle(mle);
 		}
-		list_del_init(&mle->list);
+		__dlm_unlink_mle(dlm, mle);
 		__dlm_mle_detach_hb_events(dlm, mle);
 		__dlm_put_mle(mle);
 		if (extra_ref) {
@@ -3159,10 +3141,8 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
 			tmp->master = master;
 			atomic_set(&tmp->woken, 1);
 			wake_up(&tmp->wq);
-			/* remove it from the list so that only one
-			 * mle will be found */
-			list_del_init(&tmp->list);
-			/* this was obviously WRONG.  mle is uninited here.  should be tmp. */
+			/* remove it so that only one mle will be found */
+			__dlm_unlink_mle(dlm, tmp);
 			__dlm_mle_detach_hb_events(dlm, tmp);
 			ret = DLM_MIGRATE_RESPONSE_MASTERY_REF;
 			mlog(0, "%s:%.*s: master=%u, newmaster=%u, "
@@ -3181,137 +3161,164 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
 	mle->master = master;
 	/* do this for consistency with other mle types */
 	set_bit(new_master, mle->maybe_map);
-	list_add(&mle->list, &dlm->master_list);
+	__dlm_insert_mle(dlm, mle);
 
 	return ret;
 }
 
-
-void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node)
+/*
+ * Sets the owner of the lockres, associated to the mle, to UNKNOWN
+ */
+static struct dlm_lock_resource *dlm_reset_mleres_owner(struct dlm_ctxt *dlm,
+					struct dlm_master_list_entry *mle)
 {
-	struct dlm_master_list_entry *mle, *next;
 	struct dlm_lock_resource *res;
-	unsigned int hash;
 
-	mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node);
-top:
-	assert_spin_locked(&dlm->spinlock);
+	/* Find the lockres associated to the mle and set its owner to UNK */
+	res = __dlm_lookup_lockres(dlm, mle->mname, mle->mnamelen,
+				   mle->mnamehash);
+	if (res) {
+		spin_unlock(&dlm->master_lock);
 
-	/* clean the master list */
-	spin_lock(&dlm->master_lock);
-	list_for_each_entry_safe(mle, next, &dlm->master_list, list) {
-		BUG_ON(mle->type != DLM_MLE_BLOCK &&
-		       mle->type != DLM_MLE_MASTER &&
-		       mle->type != DLM_MLE_MIGRATION);
-
-		/* MASTER mles are initiated locally.  the waiting
-		 * process will notice the node map change
-		 * shortly.  let that happen as normal. */
-		if (mle->type == DLM_MLE_MASTER)
-			continue;
+		/* move lockres onto recovery list */
+		spin_lock(&res->spinlock);
+		dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN);
+		dlm_move_lockres_to_recovery_list(dlm, res);
+		spin_unlock(&res->spinlock);
+		dlm_lockres_put(res);
 
+		/* about to get rid of mle, detach from heartbeat */
+		__dlm_mle_detach_hb_events(dlm, mle);
 
-		/* BLOCK mles are initiated by other nodes.
-		 * need to clean up if the dead node would have
-		 * been the master. */
-		if (mle->type == DLM_MLE_BLOCK) {
-			int bit;
+		/* dump the mle */
+		spin_lock(&dlm->master_lock);
+		__dlm_put_mle(mle);
+		spin_unlock(&dlm->master_lock);
+	}
 
-			spin_lock(&mle->spinlock);
-			bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
-			if (bit != dead_node) {
-				mlog(0, "mle found, but dead node %u would "
-				     "not have been master\n", dead_node);
-				spin_unlock(&mle->spinlock);
-			} else {
-				/* must drop the refcount by one since the
-				 * assert_master will never arrive.  this
-				 * may result in the mle being unlinked and
-				 * freed, but there may still be a process
-				 * waiting in the dlmlock path which is fine. */
-				mlog(0, "node %u was expected master\n",
-				     dead_node);
-				atomic_set(&mle->woken, 1);
-				spin_unlock(&mle->spinlock);
-				wake_up(&mle->wq);
-				/* do not need events any longer, so detach 
-				 * from heartbeat */
-				__dlm_mle_detach_hb_events(dlm, mle);
-				__dlm_put_mle(mle);
-			}
-			continue;
-		}
+	return res;
+}
 
-		/* everything else is a MIGRATION mle */
-
-		/* the rule for MIGRATION mles is that the master
-		 * becomes UNKNOWN if *either* the original or
-		 * the new master dies.  all UNKNOWN lockreses
-		 * are sent to whichever node becomes the recovery
-		 * master.  the new master is responsible for
-		 * determining if there is still a master for
-		 * this lockres, or if he needs to take over
-		 * mastery.  either way, this node should expect
-		 * another message to resolve this. */
-		if (mle->master != dead_node &&
-		    mle->new_master != dead_node)
-			continue;
+static void dlm_clean_migration_mle(struct dlm_ctxt *dlm,
+				    struct dlm_master_list_entry *mle)
+{
+	__dlm_mle_detach_hb_events(dlm, mle);
 
-		/* if we have reached this point, this mle needs to
-		 * be removed from the list and freed. */
+	spin_lock(&mle->spinlock);
+	__dlm_unlink_mle(dlm, mle);
+	atomic_set(&mle->woken, 1);
+	spin_unlock(&mle->spinlock);
 
-		/* remove from the list early.  NOTE: unlinking
-		 * list_head while in list_for_each_safe */
-		__dlm_mle_detach_hb_events(dlm, mle);
-		spin_lock(&mle->spinlock);
-		list_del_init(&mle->list);
+	wake_up(&mle->wq);
+}
+
+static void dlm_clean_block_mle(struct dlm_ctxt *dlm,
+				struct dlm_master_list_entry *mle, u8 dead_node)
+{
+	int bit;
+
+	BUG_ON(mle->type != DLM_MLE_BLOCK);
+
+	spin_lock(&mle->spinlock);
+	bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
+	if (bit != dead_node) {
+		mlog(0, "mle found, but dead node %u would not have been "
+		     "master\n", dead_node);
+		spin_unlock(&mle->spinlock);
+	} else {
+		/* Must drop the refcount by one since the assert_master will
+		 * never arrive. This may result in the mle being unlinked and
+		 * freed, but there may still be a process waiting in the
+		 * dlmlock path which is fine. */
+		mlog(0, "node %u was expected master\n", dead_node);
 		atomic_set(&mle->woken, 1);
 		spin_unlock(&mle->spinlock);
 		wake_up(&mle->wq);
 
-		mlog(0, "%s: node %u died during migration from "
-		     "%u to %u!\n", dlm->name, dead_node,
-		     mle->master, mle->new_master);
-		/* if there is a lockres associated with this
-	 	 * mle, find it and set its owner to UNKNOWN */
-		hash = dlm_lockid_hash(mle->u.name.name, mle->u.name.len);
-		res = __dlm_lookup_lockres(dlm, mle->u.name.name,
-					   mle->u.name.len, hash);
-		if (res) {
-			/* unfortunately if we hit this rare case, our
-		 	 * lock ordering is messed.  we need to drop
-		 	 * the master lock so that we can take the
-		  	 * lockres lock, meaning that we will have to
-			 * restart from the head of list. */
-			spin_unlock(&dlm->master_lock);
+		/* Do not need events any longer, so detach from heartbeat */
+		__dlm_mle_detach_hb_events(dlm, mle);
+		__dlm_put_mle(mle);
+	}
+}
 
-			/* move lockres onto recovery list */
-			spin_lock(&res->spinlock);
-			dlm_set_lockres_owner(dlm, res,
-				      	DLM_LOCK_RES_OWNER_UNKNOWN);
-			dlm_move_lockres_to_recovery_list(dlm, res);
-			spin_unlock(&res->spinlock);
-			dlm_lockres_put(res);
+void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node)
+{
+	struct dlm_master_list_entry *mle;
+	struct dlm_lock_resource *res;
+	struct hlist_head *bucket;
+	struct hlist_node *list;
+	unsigned int i;
 
-			/* about to get rid of mle, detach from heartbeat */
-			__dlm_mle_detach_hb_events(dlm, mle);
+	mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node);
+top:
+	assert_spin_locked(&dlm->spinlock);
 
-			/* dump the mle */
-			spin_lock(&dlm->master_lock);
-			__dlm_put_mle(mle);
-			spin_unlock(&dlm->master_lock);
+	/* clean the master list */
+	spin_lock(&dlm->master_lock);
+	for (i = 0; i < DLM_HASH_BUCKETS; i++) {
+		bucket = dlm_master_hash(dlm, i);
+		hlist_for_each(list, bucket) {
+			mle = hlist_entry(list, struct dlm_master_list_entry,
+					  master_hash_node);
+
+			BUG_ON(mle->type != DLM_MLE_BLOCK &&
+			       mle->type != DLM_MLE_MASTER &&
+			       mle->type != DLM_MLE_MIGRATION);
+
+			/* MASTER mles are initiated locally. The waiting
+			 * process will notice the node map change shortly.
+			 * Let that happen as normal. */
+			if (mle->type == DLM_MLE_MASTER)
+				continue;
+
+			/* BLOCK mles are initiated by other nodes. Need to
+			 * clean up if the dead node would have been the
+			 * master. */
+			if (mle->type == DLM_MLE_BLOCK) {
+				dlm_clean_block_mle(dlm, mle, dead_node);
+				continue;
+			}
 
-			/* restart */
-			goto top;
-		}
+			/* Everything else is a MIGRATION mle */
+
+			/* The rule for MIGRATION mles is that the master
+			 * becomes UNKNOWN if *either* the original or the new
+			 * master dies. All UNKNOWN lockres' are sent to
+			 * whichever node becomes the recovery master. The new
+			 * master is responsible for determining if there is
+			 * still a master for this lockres, or if he needs to
+			 * take over mastery. Either way, this node should
+			 * expect another message to resolve this. */
+
+			if (mle->master != dead_node &&
+			    mle->new_master != dead_node)
+				continue;
+
+			/* If we have reached this point, this mle needs to be
+			 * removed from the list and freed. */
+			dlm_clean_migration_mle(dlm, mle);
+
+			mlog(0, "%s: node %u died during migration from "
+			     "%u to %u!\n", dlm->name, dead_node, mle->master,
+			     mle->new_master);
+
+			/* If we find a lockres associated with the mle, we've
+			 * hit this rare case that messes up our lock ordering.
+			 * If so, we need to drop the master lock so that we can
+			 * take the lockres lock, meaning that we will have to
+			 * restart from the head of list. */
+			res = dlm_reset_mleres_owner(dlm, mle);
+			if (res)
+				/* restart */
+				goto top;
 
-		/* this may be the last reference */
-		__dlm_put_mle(mle);
+			/* This may be the last reference */
+			__dlm_put_mle(mle);
+		}
 	}
 	spin_unlock(&dlm->master_lock);
 }
 
-
 int dlm_finish_migration(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
 			 u8 old_master)
 {
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 4060bb328bc..d490b66ad9d 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -162,12 +162,28 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
 
 	spin_lock(&res->spinlock);
 	if (!__dlm_lockres_unused(res)) {
-		spin_unlock(&res->spinlock);
 		mlog(0, "%s:%.*s: tried to purge but not unused\n",
 		     dlm->name, res->lockname.len, res->lockname.name);
-		return -ENOTEMPTY;
+		__dlm_print_one_lock_resource(res);
+		spin_unlock(&res->spinlock);
+		BUG();
 	}
+
+	if (res->state & DLM_LOCK_RES_MIGRATING) {
+		mlog(0, "%s:%.*s: Delay dropref as this lockres is "
+		     "being remastered\n", dlm->name, res->lockname.len,
+		     res->lockname.name);
+		/* Re-add the lockres to the end of the purge list */
+		if (!list_empty(&res->purge)) {
+			list_del_init(&res->purge);
+			list_add_tail(&res->purge, &dlm->purge_list);
+		}
+		spin_unlock(&res->spinlock);
+		return 0;
+	}
+
 	master = (res->owner == dlm->node_num);
+
 	if (!master)
 		res->state |= DLM_LOCK_RES_DROPPING_REF;
 	spin_unlock(&res->spinlock);
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 7219a86d34c..e15fc7d5082 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -244,6 +244,10 @@ static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
 	.flags		= 0,
 };
 
+static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
+	.flags		= 0,
+};
+
 static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
 	.get_osb	= ocfs2_get_dentry_osb,
 	.post_unlock	= ocfs2_dentry_post_unlock,
@@ -622,6 +626,17 @@ static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
 				   &ocfs2_rename_lops, osb);
 }
 
+static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res,
+					 struct ocfs2_super *osb)
+{
+	/* nfs_sync lockres doesn't come from a slab so we call init
+	 * once on it manually.  */
+	ocfs2_lock_res_init_once(res);
+	ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name);
+	ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC,
+				   &ocfs2_nfs_sync_lops, osb);
+}
+
 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
 			      struct ocfs2_file_private *fp)
 {
@@ -2417,6 +2432,34 @@ void ocfs2_rename_unlock(struct ocfs2_super *osb)
 		ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
 }
 
+int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
+{
+	int status;
+	struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
+
+	if (ocfs2_is_hard_readonly(osb))
+		return -EROFS;
+
+	if (ocfs2_mount_local(osb))
+		return 0;
+
+	status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE,
+				    0, 0);
+	if (status < 0)
+		mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
+
+	return status;
+}
+
+void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex)
+{
+	struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
+
+	if (!ocfs2_mount_local(osb))
+		ocfs2_cluster_unlock(osb, lockres,
+				     ex ? LKM_EXMODE : LKM_PRMODE);
+}
+
 int ocfs2_dentry_lock(struct dentry *dentry, int ex)
 {
 	int ret;
@@ -2798,6 +2841,7 @@ int ocfs2_dlm_init(struct ocfs2_super *osb)
 local:
 	ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
 	ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
+	ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb);
 
 	osb->cconn = conn;
 
@@ -2833,6 +2877,7 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
 
 	ocfs2_lock_res_free(&osb->osb_super_lockres);
 	ocfs2_lock_res_free(&osb->osb_rename_lockres);
+	ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
 
 	ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
 	osb->cconn = NULL;
@@ -3015,6 +3060,7 @@ static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
 {
 	ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
 	ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
+	ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres);
 }
 
 int ocfs2_drop_inode_locks(struct inode *inode)
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 3f8d9986b8e..e1fd5721cd7 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -115,6 +115,8 @@ void ocfs2_super_unlock(struct ocfs2_super *osb,
 			int ex);
 int ocfs2_rename_lock(struct ocfs2_super *osb);
 void ocfs2_rename_unlock(struct ocfs2_super *osb);
+int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
+void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
 int ocfs2_file_lock(struct file *file, int ex, int trylock);
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 2f27b332d8b..de3da8eb558 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -31,6 +31,7 @@
 
 #include "ocfs2.h"
 
+#include "alloc.h"
 #include "dir.h"
 #include "dlmglue.h"
 #include "dcache.h"
@@ -38,6 +39,7 @@
 #include "inode.h"
 
 #include "buffer_head_io.h"
+#include "suballoc.h"
 
 struct ocfs2_inode_handle
 {
@@ -49,29 +51,97 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
 		struct ocfs2_inode_handle *handle)
 {
 	struct inode *inode;
+	struct ocfs2_super *osb = OCFS2_SB(sb);
+	u64 blkno = handle->ih_blkno;
+	int status, set;
 	struct dentry *result;
 
 	mlog_entry("(0x%p, 0x%p)\n", sb, handle);
 
-	if (handle->ih_blkno == 0) {
-		mlog_errno(-ESTALE);
-		return ERR_PTR(-ESTALE);
+	if (blkno == 0) {
+		mlog(0, "nfs wants inode with blkno: 0\n");
+		result = ERR_PTR(-ESTALE);
+		goto bail;
+	}
+
+	inode = ocfs2_ilookup(sb, blkno);
+	/*
+	 * If the inode exists in memory, we only need to check it's
+	 * generation number
+	 */
+	if (inode)
+		goto check_gen;
+
+	/*
+	 * This will synchronize us against ocfs2_delete_inode() on
+	 * all nodes
+	 */
+	status = ocfs2_nfs_sync_lock(osb, 1);
+	if (status < 0) {
+		mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
+		goto check_err;
+	}
+
+	status = ocfs2_test_inode_bit(osb, blkno, &set);
+	if (status < 0) {
+		if (status == -EINVAL) {
+			/*
+			 * The blkno NFS gave us doesn't even show up
+			 * as an inode, we return -ESTALE to be
+			 * nice
+			 */
+			mlog(0, "test inode bit failed %d\n", status);
+			status = -ESTALE;
+		} else {
+			mlog(ML_ERROR, "test inode bit failed %d\n", status);
+		}
+		goto unlock_nfs_sync;
+	}
+
+	/* If the inode allocator bit is clear, this inode must be stale */
+	if (!set) {
+		mlog(0, "inode %llu suballoc bit is clear\n", blkno);
+		status = -ESTALE;
+		goto unlock_nfs_sync;
 	}
 
-	inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
+	inode = ocfs2_iget(osb, blkno, 0, 0);
 
-	if (IS_ERR(inode))
-		return (void *)inode;
+unlock_nfs_sync:
+	ocfs2_nfs_sync_unlock(osb, 1);
 
+check_err:
+	if (status < 0) {
+		if (status == -ESTALE) {
+			mlog(0, "stale inode ino: %llu generation: %u\n",
+			     blkno, handle->ih_generation);
+		}
+		result = ERR_PTR(status);
+		goto bail;
+	}
+
+	if (IS_ERR(inode)) {
+		mlog_errno(PTR_ERR(inode));
+		result = (void *)inode;
+		goto bail;
+	}
+
+check_gen:
 	if (handle->ih_generation != inode->i_generation) {
 		iput(inode);
-		return ERR_PTR(-ESTALE);
+		mlog(0, "stale inode ino: %llu generation: %u\n", blkno,
+		     handle->ih_generation);
+		result = ERR_PTR(-ESTALE);
+		goto bail;
 	}
 
 	result = d_obtain_alias(inode);
 	if (!IS_ERR(result))
 		result->d_op = &ocfs2_dentry_ops;
+	else
+		mlog_errno(PTR_ERR(result));
 
+bail:
 	mlog_exit_ptr(result);
 	return result;
 }
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index a5887df2cd8..8672b953603 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1926,7 +1926,7 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
 		   out->f_path.dentry->d_name.len,
 		   out->f_path.dentry->d_name.name);
 
-	inode_double_lock(inode, pipe->inode);
+	mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
 
 	ret = ocfs2_rw_lock(inode, 1);
 	if (ret < 0) {
@@ -1941,12 +1941,16 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
 		goto out_unlock;
 	}
 
+	if (pipe->inode)
+		mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_CHILD);
 	ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
+	if (pipe->inode)
+		mutex_unlock(&pipe->inode->i_mutex);
 
 out_unlock:
 	ocfs2_rw_unlock(inode, 1);
 out:
-	inode_double_unlock(inode, pipe->inode);
+	mutex_unlock(&inode->i_mutex);
 
 	mlog_exit(ret);
 	return ret;
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 229e707bc05..10e1fa87396 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -38,6 +38,7 @@
 #include "ocfs2.h"
 
 #include "alloc.h"
+#include "dir.h"
 #include "blockcheck.h"
 #include "dlmglue.h"
 #include "extent_map.h"
@@ -112,6 +113,17 @@ void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
 		oi->ip_attr |= OCFS2_DIRSYNC_FL;
 }
 
+struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
+{
+	struct ocfs2_find_inode_args args;
+
+	args.fi_blkno = blkno;
+	args.fi_flags = 0;
+	args.fi_ino = ino_from_blkno(sb, blkno);
+	args.fi_sysfile_type = 0;
+
+	return ilookup5(sb, blkno, ocfs2_find_actor, &args);
+}
 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
 			 int sysfile_type)
 {
@@ -275,7 +287,7 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 		     (unsigned long long)OCFS2_I(inode)->ip_blkno,
 		     (unsigned long long)le64_to_cpu(fe->i_blkno));
 
-	inode->i_nlink = le16_to_cpu(fe->i_links_count);
+	inode->i_nlink = ocfs2_read_links_count(fe);
 
 	if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
 		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
@@ -351,6 +363,8 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 
 	ocfs2_set_inode_flags(inode);
 
+	OCFS2_I(inode)->ip_last_used_slot = 0;
+	OCFS2_I(inode)->ip_last_used_group = 0;
 	mlog_exit_void();
 }
 
@@ -606,7 +620,7 @@ static int ocfs2_remove_inode(struct inode *inode,
 	}
 
 	handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
-					ocfs2_quota_trans_credits(inode->i_sb));
+				   ocfs2_quota_trans_credits(inode->i_sb));
 	if (IS_ERR(handle)) {
 		status = PTR_ERR(handle);
 		mlog_errno(status);
@@ -740,6 +754,15 @@ static int ocfs2_wipe_inode(struct inode *inode,
 		goto bail_unlock_dir;
 	}
 
+	/* Remove any dir index tree */
+	if (S_ISDIR(inode->i_mode)) {
+		status = ocfs2_dx_dir_truncate(inode, di_bh);
+		if (status) {
+			mlog_errno(status);
+			goto bail_unlock_dir;
+		}
+	}
+
 	/*Free extended attribute resources associated with this inode.*/
 	status = ocfs2_xattr_remove(inode, di_bh);
 	if (status < 0) {
@@ -949,6 +972,17 @@ void ocfs2_delete_inode(struct inode *inode)
 		goto bail;
 	}
 
+	/*
+	 * Synchronize us against ocfs2_get_dentry. We take this in
+	 * shared mode so that all nodes can still concurrently
+	 * process deletes.
+	 */
+	status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
+	if (status < 0) {
+		mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d\n", status);
+		ocfs2_cleanup_delete_inode(inode, 0);
+		goto bail_unblock;
+	}
 	/* Lock down the inode. This gives us an up to date view of
 	 * it's metadata (for verification), and allows us to
 	 * serialize delete_inode on multiple nodes.
@@ -962,7 +996,7 @@ void ocfs2_delete_inode(struct inode *inode)
 		if (status != -ENOENT)
 			mlog_errno(status);
 		ocfs2_cleanup_delete_inode(inode, 0);
-		goto bail_unblock;
+		goto bail_unlock_nfs_sync;
 	}
 
 	/* Query the cluster. This will be the final decision made
@@ -1005,6 +1039,10 @@ void ocfs2_delete_inode(struct inode *inode)
 bail_unlock_inode:
 	ocfs2_inode_unlock(inode, 1);
 	brelse(di_bh);
+
+bail_unlock_nfs_sync:
+	ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
+
 bail_unblock:
 	status = sigprocmask(SIG_SETMASK, &oldset, NULL);
 	if (status < 0)
@@ -1205,7 +1243,7 @@ int ocfs2_mark_inode_dirty(handle_t *handle,
 	spin_unlock(&OCFS2_I(inode)->ip_lock);
 
 	fe->i_size = cpu_to_le64(i_size_read(inode));
-	fe->i_links_count = cpu_to_le16(inode->i_nlink);
+	ocfs2_set_links_count(fe, inode->i_nlink);
 	fe->i_uid = cpu_to_le32(inode->i_uid);
 	fe->i_gid = cpu_to_le32(inode->i_gid);
 	fe->i_mode = cpu_to_le16(inode->i_mode);
@@ -1242,7 +1280,7 @@ void ocfs2_refresh_inode(struct inode *inode,
 	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
 	ocfs2_set_inode_flags(inode);
 	i_size_write(inode, le64_to_cpu(fe->i_size));
-	inode->i_nlink = le16_to_cpu(fe->i_links_count);
+	inode->i_nlink = ocfs2_read_links_count(fe);
 	inode->i_uid = le32_to_cpu(fe->i_uid);
 	inode->i_gid = le32_to_cpu(fe->i_gid);
 	inode->i_mode = le16_to_cpu(fe->i_mode);
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index eb3c302b38d..ea71525aad4 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -72,6 +72,10 @@ struct ocfs2_inode_info
 
 	struct inode			vfs_inode;
 	struct jbd2_inode		ip_jinode;
+
+	/* Only valid if the inode is the dir. */
+	u32				ip_last_used_slot;
+	u64				ip_last_used_group;
 };
 
 /*
@@ -124,6 +128,7 @@ void ocfs2_drop_inode(struct inode *inode);
 /* Flags for ocfs2_iget() */
 #define OCFS2_FI_FLAG_SYSFILE		0x1
 #define OCFS2_FI_FLAG_ORPHAN_RECOVERY	0x2
+struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
 			 int sysfile_type);
 int ocfs2_inode_init_private(struct inode *inode);
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 57d7d25a2b9..a20a0f1e37f 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -65,6 +65,11 @@ static int ocfs2_trylock_journal(struct ocfs2_super *osb,
 static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 				 int slot);
 static int ocfs2_commit_thread(void *arg);
+static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
+					    int slot_num,
+					    struct ocfs2_dinode *la_dinode,
+					    struct ocfs2_dinode *tl_dinode,
+					    struct ocfs2_quota_recovery *qrec);
 
 static inline int ocfs2_wait_on_mount(struct ocfs2_super *osb)
 {
@@ -76,18 +81,97 @@ static inline int ocfs2_wait_on_quotas(struct ocfs2_super *osb)
 	return __ocfs2_wait_on_mount(osb, 1);
 }
 
-
-
 /*
- * The recovery_list is a simple linked list of node numbers to recover.
- * It is protected by the recovery_lock.
+ * This replay_map is to track online/offline slots, so we could recover
+ * offline slots during recovery and mount
  */
 
-struct ocfs2_recovery_map {
-	unsigned int rm_used;
-	unsigned int *rm_entries;
+enum ocfs2_replay_state {
+	REPLAY_UNNEEDED = 0,	/* Replay is not needed, so ignore this map */
+	REPLAY_NEEDED, 		/* Replay slots marked in rm_replay_slots */
+	REPLAY_DONE 		/* Replay was already queued */
 };
 
+struct ocfs2_replay_map {
+	unsigned int rm_slots;
+	enum ocfs2_replay_state rm_state;
+	unsigned char rm_replay_slots[0];
+};
+
+void ocfs2_replay_map_set_state(struct ocfs2_super *osb, int state)
+{
+	if (!osb->replay_map)
+		return;
+
+	/* If we've already queued the replay, we don't have any more to do */
+	if (osb->replay_map->rm_state == REPLAY_DONE)
+		return;
+
+	osb->replay_map->rm_state = state;
+}
+
+int ocfs2_compute_replay_slots(struct ocfs2_super *osb)
+{
+	struct ocfs2_replay_map *replay_map;
+	int i, node_num;
+
+	/* If replay map is already set, we don't do it again */
+	if (osb->replay_map)
+		return 0;
+
+	replay_map = kzalloc(sizeof(struct ocfs2_replay_map) +
+			     (osb->max_slots * sizeof(char)), GFP_KERNEL);
+
+	if (!replay_map) {
+		mlog_errno(-ENOMEM);
+		return -ENOMEM;
+	}
+
+	spin_lock(&osb->osb_lock);
+
+	replay_map->rm_slots = osb->max_slots;
+	replay_map->rm_state = REPLAY_UNNEEDED;
+
+	/* set rm_replay_slots for offline slot(s) */
+	for (i = 0; i < replay_map->rm_slots; i++) {
+		if (ocfs2_slot_to_node_num_locked(osb, i, &node_num) == -ENOENT)
+			replay_map->rm_replay_slots[i] = 1;
+	}
+
+	osb->replay_map = replay_map;
+	spin_unlock(&osb->osb_lock);
+	return 0;
+}
+
+void ocfs2_queue_replay_slots(struct ocfs2_super *osb)
+{
+	struct ocfs2_replay_map *replay_map = osb->replay_map;
+	int i;
+
+	if (!replay_map)
+		return;
+
+	if (replay_map->rm_state != REPLAY_NEEDED)
+		return;
+
+	for (i = 0; i < replay_map->rm_slots; i++)
+		if (replay_map->rm_replay_slots[i])
+			ocfs2_queue_recovery_completion(osb->journal, i, NULL,
+							NULL, NULL);
+	replay_map->rm_state = REPLAY_DONE;
+}
+
+void ocfs2_free_replay_slots(struct ocfs2_super *osb)
+{
+	struct ocfs2_replay_map *replay_map = osb->replay_map;
+
+	if (!osb->replay_map)
+		return;
+
+	kfree(replay_map);
+	osb->replay_map = NULL;
+}
+
 int ocfs2_recovery_init(struct ocfs2_super *osb)
 {
 	struct ocfs2_recovery_map *rm;
@@ -496,6 +580,22 @@ static struct ocfs2_triggers dq_triggers = {
 	},
 };
 
+static struct ocfs2_triggers dr_triggers = {
+	.ot_triggers = {
+		.t_commit = ocfs2_commit_trigger,
+		.t_abort = ocfs2_abort_trigger,
+	},
+	.ot_offset	= offsetof(struct ocfs2_dx_root_block, dr_check),
+};
+
+static struct ocfs2_triggers dl_triggers = {
+	.ot_triggers = {
+		.t_commit = ocfs2_commit_trigger,
+		.t_abort = ocfs2_abort_trigger,
+	},
+	.ot_offset	= offsetof(struct ocfs2_dx_leaf, dl_check),
+};
+
 static int __ocfs2_journal_access(handle_t *handle,
 				  struct inode *inode,
 				  struct buffer_head *bh,
@@ -600,6 +700,20 @@ int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
 				      type);
 }
 
+int ocfs2_journal_access_dr(handle_t *handle, struct inode *inode,
+			    struct buffer_head *bh, int type)
+{
+	return __ocfs2_journal_access(handle, inode, bh, &dr_triggers,
+				      type);
+}
+
+int ocfs2_journal_access_dl(handle_t *handle, struct inode *inode,
+			    struct buffer_head *bh, int type)
+{
+	return __ocfs2_journal_access(handle, inode, bh, &dl_triggers,
+				      type);
+}
+
 int ocfs2_journal_access(handle_t *handle, struct inode *inode,
 			 struct buffer_head *bh, int type)
 {
@@ -1176,24 +1290,24 @@ static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 }
 
 /* Called by the mount code to queue recovery the last part of
- * recovery for it's own slot. */
+ * recovery for it's own and offline slot(s). */
 void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
 {
 	struct ocfs2_journal *journal = osb->journal;
 
-	if (osb->dirty) {
-		/* No need to queue up our truncate_log as regular
-		 * cleanup will catch that. */
-		ocfs2_queue_recovery_completion(journal,
-						osb->slot_num,
-						osb->local_alloc_copy,
-						NULL,
-						NULL);
-		ocfs2_schedule_truncate_log_flush(osb, 0);
+	/* No need to queue up our truncate_log as regular cleanup will catch
+	 * that */
+	ocfs2_queue_recovery_completion(journal, osb->slot_num,
+					osb->local_alloc_copy, NULL, NULL);
+	ocfs2_schedule_truncate_log_flush(osb, 0);
 
-		osb->local_alloc_copy = NULL;
-		osb->dirty = 0;
-	}
+	osb->local_alloc_copy = NULL;
+	osb->dirty = 0;
+
+	/* queue to recover orphan slots for all offline slots */
+	ocfs2_replay_map_set_state(osb, REPLAY_NEEDED);
+	ocfs2_queue_replay_slots(osb);
+	ocfs2_free_replay_slots(osb);
 }
 
 void ocfs2_complete_quota_recovery(struct ocfs2_super *osb)
@@ -1236,6 +1350,14 @@ restart:
 		goto bail;
 	}
 
+	status = ocfs2_compute_replay_slots(osb);
+	if (status < 0)
+		mlog_errno(status);
+
+	/* queue recovery for our own slot */
+	ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
+					NULL, NULL);
+
 	spin_lock(&osb->osb_lock);
 	while (rm->rm_used) {
 		/* It's always safe to remove entry zero, as we won't
@@ -1301,11 +1423,8 @@ skip_recovery:
 
 	ocfs2_super_unlock(osb, 1);
 
-	/* We always run recovery on our own orphan dir - the dead
-	 * node(s) may have disallowd a previos inode delete. Re-processing
-	 * is therefore required. */
-	ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
-					NULL, NULL);
+	/* queue recovery for offline slots */
+	ocfs2_queue_replay_slots(osb);
 
 bail:
 	mutex_lock(&osb->recovery_lock);
@@ -1314,6 +1433,7 @@ bail:
 		goto restart;
 	}
 
+	ocfs2_free_replay_slots(osb);
 	osb->recovery_thread_task = NULL;
 	mb(); /* sync with ocfs2_recovery_thread_running */
 	wake_up(&osb->recovery_event);
@@ -1465,6 +1585,9 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
 		goto done;
 	}
 
+	/* we need to run complete recovery for offline orphan slots */
+	ocfs2_replay_map_set_state(osb, REPLAY_NEEDED);
+
 	mlog(ML_NOTICE, "Recovering node %d from slot %d on device (%u,%u)\n",
 	     node_num, slot_num,
 	     MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 172850a9a12..619dd7f6c05 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -38,6 +38,17 @@ enum ocfs2_journal_state {
 struct ocfs2_super;
 struct ocfs2_dinode;
 
+/*
+ * The recovery_list is a simple linked list of node numbers to recover.
+ * It is protected by the recovery_lock.
+ */
+
+struct ocfs2_recovery_map {
+	unsigned int rm_used;
+	unsigned int *rm_entries;
+};
+
+
 struct ocfs2_journal {
 	enum ocfs2_journal_state   j_state;    /* Journals current state   */
 
@@ -139,6 +150,7 @@ void ocfs2_wait_for_recovery(struct ocfs2_super *osb);
 int ocfs2_recovery_init(struct ocfs2_super *osb);
 void ocfs2_recovery_exit(struct ocfs2_super *osb);
 
+int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
 /*
  *  Journal Control:
  *  Initialize, Load, Shutdown, Wipe a journal.
@@ -266,6 +278,12 @@ int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
 /* dirblock */
 int ocfs2_journal_access_db(handle_t *handle, struct inode *inode,
 			    struct buffer_head *bh, int type);
+/* ocfs2_dx_root_block */
+int ocfs2_journal_access_dr(handle_t *handle, struct inode *inode,
+			    struct buffer_head *bh, int type);
+/* ocfs2_dx_leaf */
+int ocfs2_journal_access_dl(handle_t *handle, struct inode *inode,
+			    struct buffer_head *bh, int type);
 /* Anything that has no ecc */
 int ocfs2_journal_access(handle_t *handle, struct inode *inode,
 			 struct buffer_head *bh, int type);
@@ -368,14 +386,29 @@ static inline int ocfs2_remove_extent_credits(struct super_block *sb)
 }
 
 /* data block for new dir/symlink, 2 for bitmap updates (bitmap fe +
- * bitmap block for the new bit) */
-#define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + 2)
+ * bitmap block for the new bit) dx_root update for free list */
+#define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + 2 + 1)
+
+static inline int ocfs2_add_dir_index_credits(struct super_block *sb)
+{
+	/* 1 block for index, 2 allocs (data, metadata), 1 clusters
+	 * worth of blocks for initial extent. */
+	return 1 + 2 * OCFS2_SUBALLOC_ALLOC +
+		ocfs2_clusters_to_blocks(sb, 1);
+}
 
-/* parent fe, parent block, new file entry, inode alloc fe, inode alloc
- * group descriptor + mkdir/symlink blocks + quota update */
-static inline int ocfs2_mknod_credits(struct super_block *sb)
+/* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode
+ * alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr
+ * blocks + quota update */
+static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir,
+				      int xattr_credits)
 {
-	return 3 + OCFS2_SUBALLOC_ALLOC + OCFS2_DIR_LINK_ADDITIONAL_CREDITS +
+	int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS;
+
+	if (is_dir)
+		dir_credits += ocfs2_add_dir_index_credits(sb);
+
+	return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits +
 	       ocfs2_quota_trans_credits(sb);
 }
 
@@ -388,31 +421,31 @@ static inline int ocfs2_mknod_credits(struct super_block *sb)
 #define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2)
 
 /* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota
- * update on dir */
+ * update on dir + index leaf + dx root update for free list */
 static inline int ocfs2_link_credits(struct super_block *sb)
 {
-	return 2*OCFS2_INODE_UPDATE_CREDITS + 1 +
+	return 2*OCFS2_INODE_UPDATE_CREDITS + 3 +
 	       ocfs2_quota_trans_credits(sb);
 }
 
 /* inode + dir inode (if we unlink a dir), + dir entry block + orphan
- * dir inode link */
+ * dir inode link + dir inode index leaf + dir index root */
 static inline int ocfs2_unlink_credits(struct super_block *sb)
 {
 	/* The quota update from ocfs2_link_credits is unused here... */
-	return 2 * OCFS2_INODE_UPDATE_CREDITS + 1 + ocfs2_link_credits(sb);
+	return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb);
 }
 
 /* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry +
- * inode alloc group descriptor */
-#define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 1 + 1)
+ * inode alloc group descriptor + orphan dir index leaf */
+#define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 3)
 
 /* dinode update, old dir dinode update, new dir dinode update, old
  * dir dir entry, new dir dir entry, dir entry update for renaming
- * directory + target unlink */
+ * directory + target unlink + 3 x dir index leaves */
 static inline int ocfs2_rename_credits(struct super_block *sb)
 {
-	return 3 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_unlink_credits(sb);
+	return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb);
 }
 
 /* global bitmap dinode, group desc., relinked group,
@@ -422,6 +455,20 @@ static inline int ocfs2_rename_credits(struct super_block *sb)
 					  + OCFS2_INODE_UPDATE_CREDITS \
 					  + OCFS2_XATTR_BLOCK_UPDATE_CREDITS)
 
+/* inode update, removal of dx root block from allocator */
+#define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS +	\
+				      OCFS2_SUBALLOC_FREE)
+
+static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
+{
+	int credits = 1 + OCFS2_SUBALLOC_ALLOC;
+
+	credits += ocfs2_clusters_to_blocks(sb, 1);
+	credits += ocfs2_quota_trans_credits(sb);
+
+	return credits;
+}
+
 /*
  * Please note that the caller must make sure that root_el is the root
  * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
@@ -457,7 +504,7 @@ static inline int ocfs2_calc_extend_credits(struct super_block *sb,
 
 static inline int ocfs2_calc_symlink_credits(struct super_block *sb)
 {
-	int blocks = ocfs2_mknod_credits(sb);
+	int blocks = ocfs2_mknod_credits(sb, 0, 0);
 
 	/* links can be longer than one block so we may update many
 	 * within our single allocated extent. */
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index ec70cdbe77f..bac7e6abaf4 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -28,7 +28,6 @@
 #include <linux/slab.h>
 #include <linux/highmem.h>
 #include <linux/bitops.h>
-#include <linux/debugfs.h>
 
 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
 #include <cluster/masklog.h>
@@ -75,84 +74,6 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
 					  struct inode *local_alloc_inode);
 
-#ifdef CONFIG_OCFS2_FS_STATS
-
-static int ocfs2_la_debug_open(struct inode *inode, struct file *file)
-{
-	file->private_data = inode->i_private;
-	return 0;
-}
-
-#define LA_DEBUG_BUF_SZ	PAGE_CACHE_SIZE
-#define LA_DEBUG_VER	1
-static ssize_t ocfs2_la_debug_read(struct file *file, char __user *userbuf,
-				   size_t count, loff_t *ppos)
-{
-	static DEFINE_MUTEX(la_debug_mutex);
-	struct ocfs2_super *osb = file->private_data;
-	int written, ret;
-	char *buf = osb->local_alloc_debug_buf;
-
-	mutex_lock(&la_debug_mutex);
-	memset(buf, 0, LA_DEBUG_BUF_SZ);
-
-	written = snprintf(buf, LA_DEBUG_BUF_SZ,
-			   "0x%x\t0x%llx\t%u\t%u\t0x%x\n",
-			   LA_DEBUG_VER,
-			   (unsigned long long)osb->la_last_gd,
-			   osb->local_alloc_default_bits,
-			   osb->local_alloc_bits, osb->local_alloc_state);
-
-	ret = simple_read_from_buffer(userbuf, count, ppos, buf, written);
-
-	mutex_unlock(&la_debug_mutex);
-	return ret;
-}
-
-static const struct file_operations ocfs2_la_debug_fops = {
-	.open =		ocfs2_la_debug_open,
-	.read =		ocfs2_la_debug_read,
-};
-
-static void ocfs2_init_la_debug(struct ocfs2_super *osb)
-{
-	osb->local_alloc_debug_buf = kmalloc(LA_DEBUG_BUF_SZ, GFP_NOFS);
-	if (!osb->local_alloc_debug_buf)
-		return;
-
-	osb->local_alloc_debug = debugfs_create_file("local_alloc_stats",
-						     S_IFREG|S_IRUSR,
-						     osb->osb_debug_root,
-						     osb,
-						     &ocfs2_la_debug_fops);
-	if (!osb->local_alloc_debug) {
-		kfree(osb->local_alloc_debug_buf);
-		osb->local_alloc_debug_buf = NULL;
-	}
-}
-
-static void ocfs2_shutdown_la_debug(struct ocfs2_super *osb)
-{
-	if (osb->local_alloc_debug)
-		debugfs_remove(osb->local_alloc_debug);
-
-	if (osb->local_alloc_debug_buf)
-		kfree(osb->local_alloc_debug_buf);
-
-	osb->local_alloc_debug_buf = NULL;
-	osb->local_alloc_debug = NULL;
-}
-#else	/* CONFIG_OCFS2_FS_STATS */
-static void ocfs2_init_la_debug(struct ocfs2_super *osb)
-{
-	return;
-}
-static void ocfs2_shutdown_la_debug(struct ocfs2_super *osb)
-{
-	return;
-}
-#endif
-
 static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
 {
 	return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
@@ -226,8 +147,6 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 
 	mlog_entry_void();
 
-	ocfs2_init_la_debug(osb);
-
 	if (osb->local_alloc_bits == 0)
 		goto bail;
 
@@ -299,9 +218,6 @@ bail:
 	if (inode)
 		iput(inode);
 
-	if (status < 0)
-		ocfs2_shutdown_la_debug(osb);
-
 	mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
 
 	mlog_exit(status);
@@ -331,8 +247,6 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
 	cancel_delayed_work(&osb->la_enable_wq);
 	flush_workqueue(ocfs2_wq);
 
-	ocfs2_shutdown_la_debug(osb);
-
 	if (osb->local_alloc_state == OCFS2_LA_UNUSED)
 		goto out;
 
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index eea1d24713e..b606496b72e 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -154,8 +154,9 @@ out:
 	return ret;
 }
 
-static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
+	struct page *page = vmf->page;
 	struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
 	struct buffer_head *di_bh = NULL;
 	sigset_t blocked, oldset;
@@ -196,7 +197,8 @@ out:
 	ret2 = ocfs2_vm_op_unblock_sigs(&oldset);
 	if (ret2 < 0)
 		mlog_errno(ret2);
-
+	if (ret)
+		ret = VM_FAULT_SIGBUS;
 	return ret;
 }
 
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 4b11762f249..2220f93f668 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -80,14 +80,14 @@ static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 				    struct inode **ret_orphan_dir,
 				    struct inode *inode,
 				    char *name,
-				    struct buffer_head **de_bh);
+				    struct ocfs2_dir_lookup_result *lookup);
 
 static int ocfs2_orphan_add(struct ocfs2_super *osb,
 			    handle_t *handle,
 			    struct inode *inode,
 			    struct ocfs2_dinode *fe,
 			    char *name,
-			    struct buffer_head *de_bh,
+			    struct ocfs2_dir_lookup_result *lookup,
 			    struct inode *orphan_dir_inode);
 
 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
@@ -228,17 +228,18 @@ static int ocfs2_mknod(struct inode *dir,
 	struct ocfs2_super *osb;
 	struct ocfs2_dinode *dirfe;
 	struct buffer_head *new_fe_bh = NULL;
-	struct buffer_head *de_bh = NULL;
 	struct inode *inode = NULL;
 	struct ocfs2_alloc_context *inode_ac = NULL;
 	struct ocfs2_alloc_context *data_ac = NULL;
-	struct ocfs2_alloc_context *xattr_ac = NULL;
+	struct ocfs2_alloc_context *meta_ac = NULL;
 	int want_clusters = 0;
+	int want_meta = 0;
 	int xattr_credits = 0;
 	struct ocfs2_security_xattr_info si = {
 		.enable = 1,
 	};
 	int did_quota_inode = 0;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
 	mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 		   (unsigned long)dev, dentry->d_name.len,
@@ -254,13 +255,13 @@ static int ocfs2_mknod(struct inode *dir,
 		return status;
 	}
 
-	if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
+	if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
 		status = -EMLINK;
 		goto leave;
 	}
 
 	dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
-	if (!dirfe->i_links_count) {
+	if (!ocfs2_read_links_count(dirfe)) {
 		/* can't make a file in a deleted directory. */
 		status = -ENOENT;
 		goto leave;
@@ -274,7 +275,7 @@ static int ocfs2_mknod(struct inode *dir,
 	/* get a spot inside the dir. */
 	status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 					      dentry->d_name.name,
-					      dentry->d_name.len, &de_bh);
+					      dentry->d_name.len, &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -308,17 +309,29 @@ static int ocfs2_mknod(struct inode *dir,
 
 	/* calculate meta data/clusters for setting security and acl xattr */
 	status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
-					&si, &want_clusters,
-					&xattr_credits, &xattr_ac);
+				       &si, &want_clusters,
+				       &xattr_credits, &want_meta);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
 	}
 
 	/* Reserve a cluster if creating an extent based directory. */
-	if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb))
+	if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 		want_clusters += 1;
 
+		/* Dir indexing requires extra space as well */
+		if (ocfs2_supports_indexed_dirs(osb))
+			want_meta++;
+	}
+
+	status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
+	if (status < 0) {
+		if (status != -ENOSPC)
+			mlog_errno(status);
+		goto leave;
+	}
+
 	status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
 	if (status < 0) {
 		if (status != -ENOSPC)
@@ -326,8 +339,9 @@ static int ocfs2_mknod(struct inode *dir,
 		goto leave;
 	}
 
-	handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb) +
-				   xattr_credits);
+	handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
+							    S_ISDIR(mode),
+							    xattr_credits));
 	if (IS_ERR(handle)) {
 		status = PTR_ERR(handle);
 		handle = NULL;
@@ -355,7 +369,7 @@ static int ocfs2_mknod(struct inode *dir,
 
 	if (S_ISDIR(mode)) {
 		status = ocfs2_fill_new_dir(osb, handle, dir, inode,
-					    new_fe_bh, data_ac);
+					    new_fe_bh, data_ac, meta_ac);
 		if (status < 0) {
 			mlog_errno(status);
 			goto leave;
@@ -367,7 +381,7 @@ static int ocfs2_mknod(struct inode *dir,
 			mlog_errno(status);
 			goto leave;
 		}
-		le16_add_cpu(&dirfe->i_links_count, 1);
+		ocfs2_add_links_count(dirfe, 1);
 		status = ocfs2_journal_dirty(handle, parent_fe_bh);
 		if (status < 0) {
 			mlog_errno(status);
@@ -377,7 +391,7 @@ static int ocfs2_mknod(struct inode *dir,
 	}
 
 	status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
-				xattr_ac, data_ac);
+				meta_ac, data_ac);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -385,7 +399,7 @@ static int ocfs2_mknod(struct inode *dir,
 
 	if (si.enable) {
 		status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
-						 xattr_ac, data_ac);
+						 meta_ac, data_ac);
 		if (status < 0) {
 			mlog_errno(status);
 			goto leave;
@@ -394,7 +408,7 @@ static int ocfs2_mknod(struct inode *dir,
 
 	status = ocfs2_add_entry(handle, dentry, inode,
 				 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
-				 de_bh);
+				 &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -423,11 +437,12 @@ leave:
 		mlog(0, "Disk is full\n");
 
 	brelse(new_fe_bh);
-	brelse(de_bh);
 	brelse(parent_fe_bh);
 	kfree(si.name);
 	kfree(si.value);
 
+	ocfs2_free_dir_lookup_result(&lookup);
+
 	if ((status < 0) && inode) {
 		clear_nlink(inode);
 		iput(inode);
@@ -439,8 +454,8 @@ leave:
 	if (data_ac)
 		ocfs2_free_alloc_context(data_ac);
 
-	if (xattr_ac)
-		ocfs2_free_alloc_context(xattr_ac);
+	if (meta_ac)
+		ocfs2_free_alloc_context(meta_ac);
 
 	mlog_exit(status);
 
@@ -462,6 +477,7 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 	struct ocfs2_extent_list *fel;
 	u64 fe_blkno = 0;
 	u16 suballoc_bit;
+	u16 feat;
 
 	mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
 		   inode->i_mode, (unsigned long)dev, dentry->d_name.len,
@@ -469,8 +485,8 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 
 	*new_fe_bh = NULL;
 
-	status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
-				       &fe_blkno);
+	status = ocfs2_claim_new_inode(osb, handle, dir, parent_fe_bh,
+				       inode_ac, &suballoc_bit, &fe_blkno);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -513,7 +529,8 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 	fe->i_mode = cpu_to_le16(inode->i_mode);
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 		fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
-	fe->i_links_count = cpu_to_le16(inode->i_nlink);
+
+	ocfs2_set_links_count(fe, inode->i_nlink);
 
 	fe->i_last_eb_blk = 0;
 	strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
@@ -525,11 +542,11 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 	fe->i_dtime = 0;
 
 	/*
-	 * If supported, directories start with inline data.
+	 * If supported, directories start with inline data. If inline
+	 * isn't supported, but indexing is, we start them as indexed.
 	 */
+	feat = le16_to_cpu(fe->i_dyn_features);
 	if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
-		u16 feat = le16_to_cpu(fe->i_dyn_features);
-
 		fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 
 		fe->id2.i_data.id_count = cpu_to_le16(
@@ -608,9 +625,9 @@ static int ocfs2_link(struct dentry *old_dentry,
 	int err;
 	struct buffer_head *fe_bh = NULL;
 	struct buffer_head *parent_fe_bh = NULL;
-	struct buffer_head *de_bh = NULL;
 	struct ocfs2_dinode *fe = NULL;
 	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
 	mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 		   old_dentry->d_name.len, old_dentry->d_name.name,
@@ -638,7 +655,7 @@ static int ocfs2_link(struct dentry *old_dentry,
 
 	err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 					   dentry->d_name.name,
-					   dentry->d_name.len, &de_bh);
+					   dentry->d_name.len, &lookup);
 	if (err < 0) {
 		mlog_errno(err);
 		goto out;
@@ -652,7 +669,7 @@ static int ocfs2_link(struct dentry *old_dentry,
 	}
 
 	fe = (struct ocfs2_dinode *) fe_bh->b_data;
-	if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
+	if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
 		err = -EMLINK;
 		goto out_unlock_inode;
 	}
@@ -674,13 +691,13 @@ static int ocfs2_link(struct dentry *old_dentry,
 
 	inc_nlink(inode);
 	inode->i_ctime = CURRENT_TIME;
-	fe->i_links_count = cpu_to_le16(inode->i_nlink);
+	ocfs2_set_links_count(fe, inode->i_nlink);
 	fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 	fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 
 	err = ocfs2_journal_dirty(handle, fe_bh);
 	if (err < 0) {
-		le16_add_cpu(&fe->i_links_count, -1);
+		ocfs2_add_links_count(fe, -1);
 		drop_nlink(inode);
 		mlog_errno(err);
 		goto out_commit;
@@ -688,9 +705,9 @@ static int ocfs2_link(struct dentry *old_dentry,
 
 	err = ocfs2_add_entry(handle, dentry, inode,
 			      OCFS2_I(inode)->ip_blkno,
-			      parent_fe_bh, de_bh);
+			      parent_fe_bh, &lookup);
 	if (err) {
-		le16_add_cpu(&fe->i_links_count, -1);
+		ocfs2_add_links_count(fe, -1);
 		drop_nlink(inode);
 		mlog_errno(err);
 		goto out_commit;
@@ -714,10 +731,11 @@ out_unlock_inode:
 out:
 	ocfs2_inode_unlock(dir, 1);
 
-	brelse(de_bh);
 	brelse(fe_bh);
 	brelse(parent_fe_bh);
 
+	ocfs2_free_dir_lookup_result(&lookup);
+
 	mlog_exit(err);
 
 	return err;
@@ -766,10 +784,9 @@ static int ocfs2_unlink(struct inode *dir,
 	struct buffer_head *fe_bh = NULL;
 	struct buffer_head *parent_node_bh = NULL;
 	handle_t *handle = NULL;
-	struct ocfs2_dir_entry *dirent = NULL;
-	struct buffer_head *dirent_bh = NULL;
 	char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
-	struct buffer_head *orphan_entry_bh = NULL;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
+	struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
 
 	mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 		   dentry->d_name.len, dentry->d_name.name);
@@ -791,8 +808,8 @@ static int ocfs2_unlink(struct inode *dir,
 	}
 
 	status = ocfs2_find_files_on_disk(dentry->d_name.name,
-					  dentry->d_name.len, &blkno,
-					  dir, &dirent_bh, &dirent);
+					  dentry->d_name.len, &blkno, dir,
+					  &lookup);
 	if (status < 0) {
 		if (status != -ENOENT)
 			mlog_errno(status);
@@ -817,10 +834,7 @@ static int ocfs2_unlink(struct inode *dir,
 	child_locked = 1;
 
 	if (S_ISDIR(inode->i_mode)) {
-	       	if (!ocfs2_empty_dir(inode)) {
-			status = -ENOTEMPTY;
-			goto leave;
-		} else if (inode->i_nlink != 2) {
+		if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
 			status = -ENOTEMPTY;
 			goto leave;
 		}
@@ -836,8 +850,7 @@ static int ocfs2_unlink(struct inode *dir,
 
 	if (inode_is_unlinkable(inode)) {
 		status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
-						  orphan_name,
-						  &orphan_entry_bh);
+						  orphan_name, &orphan_insert);
 		if (status < 0) {
 			mlog_errno(status);
 			goto leave;
@@ -863,7 +876,7 @@ static int ocfs2_unlink(struct inode *dir,
 
 	if (inode_is_unlinkable(inode)) {
 		status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
-					  orphan_entry_bh, orphan_dir);
+					  &orphan_insert, orphan_dir);
 		if (status < 0) {
 			mlog_errno(status);
 			goto leave;
@@ -871,7 +884,7 @@ static int ocfs2_unlink(struct inode *dir,
 	}
 
 	/* delete the name from the parent dir */
-	status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
+	status = ocfs2_delete_entry(handle, dir, &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -880,7 +893,7 @@ static int ocfs2_unlink(struct inode *dir,
 	if (S_ISDIR(inode->i_mode))
 		drop_nlink(inode);
 	drop_nlink(inode);
-	fe->i_links_count = cpu_to_le16(inode->i_nlink);
+	ocfs2_set_links_count(fe, inode->i_nlink);
 
 	status = ocfs2_journal_dirty(handle, fe_bh);
 	if (status < 0) {
@@ -916,9 +929,10 @@ leave:
 	}
 
 	brelse(fe_bh);
-	brelse(dirent_bh);
 	brelse(parent_node_bh);
-	brelse(orphan_entry_bh);
+
+	ocfs2_free_dir_lookup_result(&orphan_insert);
+	ocfs2_free_dir_lookup_result(&lookup);
 
 	mlog_exit(status);
 
@@ -1004,8 +1018,8 @@ static int ocfs2_rename(struct inode *old_dir,
 			struct inode *new_dir,
 			struct dentry *new_dentry)
 {
-	int status = 0, rename_lock = 0, parents_locked = 0;
-	int old_child_locked = 0, new_child_locked = 0;
+	int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
+	int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
 	struct inode *old_inode = old_dentry->d_inode;
 	struct inode *new_inode = new_dentry->d_inode;
 	struct inode *orphan_dir = NULL;
@@ -1020,13 +1034,13 @@ static int ocfs2_rename(struct inode *old_dir,
 	handle_t *handle = NULL;
 	struct buffer_head *old_dir_bh = NULL;
 	struct buffer_head *new_dir_bh = NULL;
-	struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
-		*new_de = NULL;
-	struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
-	struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
-						    // this is the 1st dirent bh
 	nlink_t old_dir_nlink = old_dir->i_nlink;
 	struct ocfs2_dinode *old_di;
+	struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
+	struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
+	struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
+	struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
+	struct ocfs2_dir_lookup_result target_insert = { NULL, };
 
 	/* At some point it might be nice to break this function up a
 	 * bit. */
@@ -1108,9 +1122,10 @@ static int ocfs2_rename(struct inode *old_dir,
 	if (S_ISDIR(old_inode->i_mode)) {
 		u64 old_inode_parent;
 
+		update_dot_dot = 1;
 		status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
-						  old_inode, &old_inode_de_bh,
-						  &old_inode_dot_dot_de);
+						  old_inode,
+						  &old_inode_dot_dot_res);
 		if (status) {
 			status = -EIO;
 			goto bail;
@@ -1122,7 +1137,7 @@ static int ocfs2_rename(struct inode *old_dir,
 		}
 
 		if (!new_inode && new_dir != old_dir &&
-		    new_dir->i_nlink >= OCFS2_LINK_MAX) {
+		    new_dir->i_nlink >= ocfs2_link_max(osb)) {
 			status = -EMLINK;
 			goto bail;
 		}
@@ -1151,8 +1166,8 @@ static int ocfs2_rename(struct inode *old_dir,
 	 * to delete it */
 	status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
 					  new_dentry->d_name.len,
-					  &newfe_blkno, new_dir, &new_de_bh,
-					  &new_de);
+					  &newfe_blkno, new_dir,
+					  &target_lookup_res);
 	/* The only error we allow here is -ENOENT because the new
 	 * file not existing is perfectly valid. */
 	if ((status < 0) && (status != -ENOENT)) {
@@ -1161,8 +1176,10 @@ static int ocfs2_rename(struct inode *old_dir,
 		mlog_errno(status);
 		goto bail;
 	}
+	if (status == 0)
+		target_exists = 1;
 
-	if (!new_de && new_inode) {
+	if (!target_exists && new_inode) {
 		/*
 		 * Target was unlinked by another node while we were
 		 * waiting to get to ocfs2_rename(). There isn't
@@ -1175,7 +1192,7 @@ static int ocfs2_rename(struct inode *old_dir,
 
 	/* In case we need to overwrite an existing file, we blow it
 	 * away first */
-	if (new_de) {
+	if (target_exists) {
 		/* VFS didn't think there existed an inode here, but
 		 * someone else in the cluster must have raced our
 		 * rename to create one. Today we error cleanly, in
@@ -1216,8 +1233,8 @@ static int ocfs2_rename(struct inode *old_dir,
 
 		newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
 
-		mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
-		     "newfebh=%p bhblocknr=%llu\n", new_de,
+		mlog(0, "aha rename over existing... new_blkno=%llu "
+		     "newfebh=%p bhblocknr=%llu\n",
 		     (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
 		     (unsigned long long)newfe_bh->b_blocknr : 0ULL);
 
@@ -1225,7 +1242,7 @@ static int ocfs2_rename(struct inode *old_dir,
 			status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
 							  new_inode,
 							  orphan_name,
-							  &orphan_entry_bh);
+							  &orphan_insert);
 			if (status < 0) {
 				mlog_errno(status);
 				goto bail;
@@ -1243,7 +1260,7 @@ static int ocfs2_rename(struct inode *old_dir,
 		status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
 						      new_dentry->d_name.name,
 						      new_dentry->d_name.len,
-						      &insert_entry_bh);
+						      &target_insert);
 		if (status < 0) {
 			mlog_errno(status);
 			goto bail;
@@ -1258,10 +1275,10 @@ static int ocfs2_rename(struct inode *old_dir,
 		goto bail;
 	}
 
-	if (new_de) {
+	if (target_exists) {
 		if (S_ISDIR(new_inode->i_mode)) {
-			if (!ocfs2_empty_dir(new_inode) ||
-			    new_inode->i_nlink != 2) {
+			if (new_inode->i_nlink != 2 ||
+			    !ocfs2_empty_dir(new_inode)) {
 				status = -ENOTEMPTY;
 				goto bail;
 			}
@@ -1274,10 +1291,10 @@ static int ocfs2_rename(struct inode *old_dir,
 		}
 
 		if (S_ISDIR(new_inode->i_mode) ||
-		    (newfe->i_links_count == cpu_to_le16(1))){
+		    (ocfs2_read_links_count(newfe) == 1)) {
 			status = ocfs2_orphan_add(osb, handle, new_inode,
 						  newfe, orphan_name,
-						  orphan_entry_bh, orphan_dir);
+						  &orphan_insert, orphan_dir);
 			if (status < 0) {
 				mlog_errno(status);
 				goto bail;
@@ -1285,8 +1302,8 @@ static int ocfs2_rename(struct inode *old_dir,
 		}
 
 		/* change the dirent to point to the correct inode */
-		status = ocfs2_update_entry(new_dir, handle, new_de_bh,
-					    new_de, old_inode);
+		status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
+					    old_inode);
 		if (status < 0) {
 			mlog_errno(status);
 			goto bail;
@@ -1294,9 +1311,9 @@ static int ocfs2_rename(struct inode *old_dir,
 		new_dir->i_version++;
 
 		if (S_ISDIR(new_inode->i_mode))
-			newfe->i_links_count = 0;
+			ocfs2_set_links_count(newfe, 0);
 		else
-			le16_add_cpu(&newfe->i_links_count, -1);
+			ocfs2_add_links_count(newfe, -1);
 
 		status = ocfs2_journal_dirty(handle, newfe_bh);
 		if (status < 0) {
@@ -1307,7 +1324,7 @@ static int ocfs2_rename(struct inode *old_dir,
 		/* if the name was not found in new_dir, add it now */
 		status = ocfs2_add_entry(handle, new_dentry, old_inode,
 					 OCFS2_I(old_inode)->ip_blkno,
-					 new_dir_bh, insert_entry_bh);
+					 new_dir_bh, &target_insert);
 	}
 
 	old_inode->i_ctime = CURRENT_TIME;
@@ -1334,15 +1351,13 @@ static int ocfs2_rename(struct inode *old_dir,
 	 * because the insert might have changed the type of directory
 	 * we're dealing with.
 	 */
-	old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
-				     old_dentry->d_name.len,
-				     old_dir, &old_de);
-	if (!old_de_bh) {
-		status = -EIO;
+	status = ocfs2_find_entry(old_dentry->d_name.name,
+				  old_dentry->d_name.len, old_dir,
+				  &old_entry_lookup);
+	if (status)
 		goto bail;
-	}
 
-	status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
+	status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
@@ -1353,9 +1368,10 @@ static int ocfs2_rename(struct inode *old_dir,
 		new_inode->i_ctime = CURRENT_TIME;
 	}
 	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
-	if (old_inode_de_bh) {
-		status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
-					    old_inode_dot_dot_de, new_dir);
+
+	if (update_dot_dot) {
+		status = ocfs2_update_entry(old_inode, handle,
+					    &old_inode_dot_dot_res, new_dir);
 		old_dir->i_nlink--;
 		if (new_inode) {
 			new_inode->i_nlink--;
@@ -1391,14 +1407,13 @@ static int ocfs2_rename(struct inode *old_dir,
 		} else {
 			struct ocfs2_dinode *fe;
 			status = ocfs2_journal_access_di(handle, old_dir,
-							 old_dir_bh,
-							 OCFS2_JOURNAL_ACCESS_WRITE);
+						      old_dir_bh,
+						      OCFS2_JOURNAL_ACCESS_WRITE);
 			fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
-			fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
+			ocfs2_set_links_count(fe, old_dir->i_nlink);
 			status = ocfs2_journal_dirty(handle, old_dir_bh);
 		}
 	}
-
 	ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
 	status = 0;
 bail:
@@ -1429,13 +1444,17 @@ bail:
 
 	if (new_inode)
 		iput(new_inode);
+
+	ocfs2_free_dir_lookup_result(&target_lookup_res);
+	ocfs2_free_dir_lookup_result(&old_entry_lookup);
+	ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
+	ocfs2_free_dir_lookup_result(&orphan_insert);
+	ocfs2_free_dir_lookup_result(&target_insert);
+
 	brelse(newfe_bh);
 	brelse(old_inode_bh);
 	brelse(old_dir_bh);
 	brelse(new_dir_bh);
-	brelse(new_de_bh);
-	brelse(old_de_bh);
-	brelse(old_inode_de_bh);
 	brelse(orphan_entry_bh);
 	brelse(insert_entry_bh);
 
@@ -1558,7 +1577,6 @@ static int ocfs2_symlink(struct inode *dir,
 	struct inode *inode = NULL;
 	struct super_block *sb;
 	struct buffer_head *new_fe_bh = NULL;
-	struct buffer_head *de_bh = NULL;
 	struct buffer_head *parent_fe_bh = NULL;
 	struct ocfs2_dinode *fe = NULL;
 	struct ocfs2_dinode *dirfe;
@@ -1572,6 +1590,7 @@ static int ocfs2_symlink(struct inode *dir,
 		.enable = 1,
 	};
 	int did_quota = 0, did_quota_inode = 0;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
 	mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
 		   dentry, symname, dentry->d_name.len, dentry->d_name.name);
@@ -1592,7 +1611,7 @@ static int ocfs2_symlink(struct inode *dir,
 	}
 
 	dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
-	if (!dirfe->i_links_count) {
+	if (!ocfs2_read_links_count(dirfe)) {
 		/* can't make a file in a deleted directory. */
 		status = -ENOENT;
 		goto bail;
@@ -1605,7 +1624,7 @@ static int ocfs2_symlink(struct inode *dir,
 
 	status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 					      dentry->d_name.name,
-					      dentry->d_name.len, &de_bh);
+					      dentry->d_name.len, &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
@@ -1744,7 +1763,7 @@ static int ocfs2_symlink(struct inode *dir,
 
 	status = ocfs2_add_entry(handle, dentry, inode,
 				 le64_to_cpu(fe->i_blkno), parent_fe_bh,
-				 de_bh);
+				 &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
@@ -1772,9 +1791,9 @@ bail:
 
 	brelse(new_fe_bh);
 	brelse(parent_fe_bh);
-	brelse(de_bh);
 	kfree(si.name);
 	kfree(si.value);
+	ocfs2_free_dir_lookup_result(&lookup);
 	if (inode_ac)
 		ocfs2_free_alloc_context(inode_ac);
 	if (data_ac)
@@ -1826,7 +1845,7 @@ static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 				    struct inode **ret_orphan_dir,
 				    struct inode *inode,
 				    char *name,
-				    struct buffer_head **de_bh)
+				    struct ocfs2_dir_lookup_result *lookup)
 {
 	struct inode *orphan_dir_inode;
 	struct buffer_head *orphan_dir_bh = NULL;
@@ -1857,7 +1876,7 @@ static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 
 	status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
 					      orphan_dir_bh, name,
-					      OCFS2_ORPHAN_NAMELEN, de_bh);
+					      OCFS2_ORPHAN_NAMELEN, lookup);
 	if (status < 0) {
 		ocfs2_inode_unlock(orphan_dir_inode, 1);
 
@@ -1884,7 +1903,7 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
 			    struct inode *inode,
 			    struct ocfs2_dinode *fe,
 			    char *name,
-			    struct buffer_head *de_bh,
+			    struct ocfs2_dir_lookup_result *lookup,
 			    struct inode *orphan_dir_inode)
 {
 	struct buffer_head *orphan_dir_bh = NULL;
@@ -1910,8 +1929,8 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
 	 * underneath us... */
 	orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
 	if (S_ISDIR(inode->i_mode))
-		le16_add_cpu(&orphan_fe->i_links_count, 1);
-	orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
+		ocfs2_add_links_count(orphan_fe, 1);
+	orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
 
 	status = ocfs2_journal_dirty(handle, orphan_dir_bh);
 	if (status < 0) {
@@ -1922,7 +1941,7 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
 	status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
 				   OCFS2_ORPHAN_NAMELEN, inode,
 				   OCFS2_I(inode)->ip_blkno,
-				   orphan_dir_bh, de_bh);
+				   orphan_dir_bh, lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -1955,8 +1974,7 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
 	char name[OCFS2_ORPHAN_NAMELEN + 1];
 	struct ocfs2_dinode *orphan_fe;
 	int status = 0;
-	struct buffer_head *target_de_bh = NULL;
-	struct ocfs2_dir_entry *target_de = NULL;
+	struct ocfs2_dir_lookup_result lookup = { NULL, };
 
 	mlog_entry_void();
 
@@ -1971,17 +1989,15 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
 	     OCFS2_ORPHAN_NAMELEN);
 
 	/* find it's spot in the orphan directory */
-	target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
-					orphan_dir_inode, &target_de);
-	if (!target_de_bh) {
-		status = -ENOENT;
+	status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
+				  &lookup);
+	if (status) {
 		mlog_errno(status);
 		goto leave;
 	}
 
 	/* remove it from the orphan directory */
-	status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
-				    target_de_bh);
+	status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
 	if (status < 0) {
 		mlog_errno(status);
 		goto leave;
@@ -1997,8 +2013,8 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
 	/* do the i_nlink dance! :) */
 	orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
 	if (S_ISDIR(inode->i_mode))
-		le16_add_cpu(&orphan_fe->i_links_count, -1);
-	orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
+		ocfs2_add_links_count(orphan_fe, -1);
+	orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
 
 	status = ocfs2_journal_dirty(handle, orphan_dir_bh);
 	if (status < 0) {
@@ -2007,7 +2023,7 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
 	}
 
 leave:
-	brelse(target_de_bh);
+	ocfs2_free_dir_lookup_result(&lookup);
 
 	mlog_exit(status);
 	return status;
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 946d3c34b90..1386281950d 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -209,6 +209,7 @@ enum ocfs2_mount_options
 struct ocfs2_journal;
 struct ocfs2_slot_info;
 struct ocfs2_recovery_map;
+struct ocfs2_replay_map;
 struct ocfs2_quota_recovery;
 struct ocfs2_dentry_lock;
 struct ocfs2_super
@@ -264,6 +265,7 @@ struct ocfs2_super
 	atomic_t vol_state;
 	struct mutex recovery_lock;
 	struct ocfs2_recovery_map *recovery_map;
+	struct ocfs2_replay_map *replay_map;
 	struct task_struct *recovery_thread_task;
 	int disable_recovery;
 	wait_queue_head_t checkpoint_event;
@@ -287,11 +289,6 @@ struct ocfs2_super
 
 	u64 la_last_gd;
 
-#ifdef CONFIG_OCFS2_FS_STATS
-	struct dentry *local_alloc_debug;
-	char *local_alloc_debug_buf;
-#endif
-
 	/* Next three fields are for local node slot recovery during
 	 * mount. */
 	int dirty;
@@ -305,9 +302,11 @@ struct ocfs2_super
 	struct ocfs2_cluster_connection *cconn;
 	struct ocfs2_lock_res osb_super_lockres;
 	struct ocfs2_lock_res osb_rename_lockres;
+	struct ocfs2_lock_res osb_nfs_sync_lockres;
 	struct ocfs2_dlm_debug *osb_dlm_debug;
 
 	struct dentry *osb_debug_root;
+	struct dentry *osb_ctxt;
 
 	wait_queue_head_t recovery_event;
 
@@ -344,6 +343,12 @@ struct ocfs2_super
 
 	/* used to protect metaecc calculation check of xattr. */
 	spinlock_t osb_xattr_lock;
+
+	unsigned int			osb_dx_mask;
+	u32				osb_dx_seed[4];
+
+	/* the group we used to allocate inodes. */
+	u64				osb_inode_alloc_group;
 };
 
 #define OCFS2_SB(sb)	    ((struct ocfs2_super *)(sb)->s_fs_info)
@@ -402,6 +407,51 @@ static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
 	return 0;
 }
 
+static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
+{
+	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
+		return 1;
+	return 0;
+}
+
+static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
+{
+	if (ocfs2_supports_indexed_dirs(osb))
+		return OCFS2_DX_LINK_MAX;
+	return OCFS2_LINK_MAX;
+}
+
+static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
+{
+	u32 nlink = le16_to_cpu(di->i_links_count);
+	u32 hi = le16_to_cpu(di->i_links_count_hi);
+
+	if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
+		nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
+
+	return nlink;
+}
+
+static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
+{
+	u16 lo, hi;
+
+	lo = nlink;
+	hi = nlink >> OCFS2_LINKS_HI_SHIFT;
+
+	di->i_links_count = cpu_to_le16(lo);
+	di->i_links_count_hi = cpu_to_le16(hi);
+}
+
+static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
+{
+	u32 links = ocfs2_read_links_count(di);
+
+	links += n;
+
+	ocfs2_set_links_count(di, links);
+}
+
 /* set / clear functions because cluster events can make these happen
  * in parallel so we want the transitions to be atomic. this also
  * means that any future flags osb_flags must be protected by spinlock
@@ -482,6 +532,12 @@ static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)					\
 	(!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
 
+#define OCFS2_IS_VALID_DX_ROOT(ptr)					\
+	(!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
+
+#define OCFS2_IS_VALID_DX_LEAF(ptr)					\
+	(!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
+
 static inline unsigned long ino_from_blkno(struct super_block *sb,
 					   u64 blkno)
 {
@@ -532,6 +588,16 @@ static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 	return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 }
 
+static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
+					       u64 blocks)
+{
+	int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
+	unsigned int clusters;
+
+	clusters = ocfs2_blocks_to_clusters(sb, blocks);
+	return (u64)clusters << bits;
+}
+
 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 						u64 bytes)
 {
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 2332ef740f4..7ab6e9e5e77 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -66,6 +66,8 @@
 #define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
 #define OCFS2_XATTR_BLOCK_SIGNATURE	"XATTR01"
 #define OCFS2_DIR_TRAILER_SIGNATURE	"DIRTRL1"
+#define OCFS2_DX_ROOT_SIGNATURE		"DXDIR01"
+#define OCFS2_DX_LEAF_SIGNATURE		"DXLEAF1"
 
 /* Compatibility flags */
 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)			\
@@ -95,7 +97,8 @@
 					 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
 					 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
 					 | OCFS2_FEATURE_INCOMPAT_XATTR \
-					 | OCFS2_FEATURE_INCOMPAT_META_ECC)
+					 | OCFS2_FEATURE_INCOMPAT_META_ECC \
+					 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP	(OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
 					 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
 					 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
@@ -151,6 +154,9 @@
 /* Support for extended attributes */
 #define OCFS2_FEATURE_INCOMPAT_XATTR		0x0200
 
+/* Support for indexed directores */
+#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS	0x0400
+
 /* Metadata checksum and error correction */
 #define OCFS2_FEATURE_INCOMPAT_META_ECC		0x0800
 
@@ -411,8 +417,12 @@ static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 #define OCFS2_DIR_REC_LEN(name_len)	(((name_len) + OCFS2_DIR_MEMBER_LEN + \
                                           OCFS2_DIR_ROUND) & \
 					 ~OCFS2_DIR_ROUND)
+#define OCFS2_DIR_MIN_REC_LEN	OCFS2_DIR_REC_LEN(1)
 
 #define OCFS2_LINK_MAX		32000
+#define	OCFS2_DX_LINK_MAX	((1U << 31) - 1U)
+#define	OCFS2_LINKS_HI_SHIFT	16
+#define	OCFS2_DX_ENTRIES_MAX	(0xffffffffU)
 
 #define S_SHIFT			12
 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
@@ -628,8 +638,9 @@ struct ocfs2_super_block {
 /*B8*/	__le16 s_xattr_inline_size;	/* extended attribute inline size
 					   for this fs*/
 	__le16 s_reserved0;
-	__le32 s_reserved1;
-/*C0*/  __le64 s_reserved2[16];		/* Fill out superblock */
+	__le32 s_dx_seed[3];		/* seed[0-2] for dx dir hash.
+					 * s_uuid_hash serves as seed[3]. */
+/*C0*/  __le64 s_reserved2[15];		/* Fill out superblock */
 /*140*/
 
 	/*
@@ -679,7 +690,7 @@ struct ocfs2_dinode {
 					   belongs to */
 	__le16 i_suballoc_bit;		/* Bit offset in suballocator
 					   block group */
-/*10*/	__le16 i_reserved0;
+/*10*/	__le16 i_links_count_hi;	/* High 16 bits of links count */
 	__le16 i_xattr_inline_size;
 	__le32 i_clusters;		/* Cluster count */
 	__le32 i_uid;			/* Owner UID */
@@ -705,7 +716,8 @@ struct ocfs2_dinode {
 	__le16 i_dyn_features;
 	__le64 i_xattr_loc;
 /*80*/	struct ocfs2_block_check i_check;	/* Error checking */
-/*88*/	__le64 i_reserved2[6];
+/*88*/	__le64 i_dx_root;		/* Pointer to dir index root block */
+	__le64 i_reserved2[5];
 /*B8*/	union {
 		__le64 i_pad1;		/* Generic way to refer to this
 					   64bit union */
@@ -781,6 +793,90 @@ struct ocfs2_dir_block_trailer {
 /*40*/
 };
 
+ /*
+ * A directory entry in the indexed tree. We don't store the full name here,
+ * but instead provide a pointer to the full dirent in the unindexed tree.
+ *
+ * We also store name_len here so as to reduce the number of leaf blocks we
+ * need to search in case of collisions.
+ */
+struct ocfs2_dx_entry {
+	__le32		dx_major_hash;	/* Used to find logical
+					 * cluster in index */
+	__le32		dx_minor_hash;	/* Lower bits used to find
+					 * block in cluster */
+	__le64		dx_dirent_blk;	/* Physical block in unindexed
+					 * tree holding this dirent. */
+};
+
+struct ocfs2_dx_entry_list {
+	__le32		de_reserved;
+	__le16		de_count;	/* Maximum number of entries
+					 * possible in de_entries */
+	__le16		de_num_used;	/* Current number of
+					 * de_entries entries */
+	struct	ocfs2_dx_entry		de_entries[0];	/* Indexed dir entries
+							 * in a packed array of
+							 * length de_num_used */
+};
+
+#define OCFS2_DX_FLAG_INLINE	0x01
+
+/*
+ * A directory indexing block. Each indexed directory has one of these,
+ * pointed to by ocfs2_dinode.
+ *
+ * This block stores an indexed btree root, and a set of free space
+ * start-of-list pointers.
+ */
+struct ocfs2_dx_root_block {
+	__u8		dr_signature[8];	/* Signature for verification */
+	struct ocfs2_block_check dr_check;	/* Error checking */
+	__le16		dr_suballoc_slot;	/* Slot suballocator this
+						 * block belongs to. */
+	__le16		dr_suballoc_bit;	/* Bit offset in suballocator
+						 * block group */
+	__le32		dr_fs_generation;	/* Must match super block */
+	__le64		dr_blkno;		/* Offset on disk, in blocks */
+	__le64		dr_last_eb_blk;		/* Pointer to last
+						 * extent block */
+	__le32		dr_clusters;		/* Clusters allocated
+						 * to the indexed tree. */
+	__u8		dr_flags;		/* OCFS2_DX_FLAG_* flags */
+	__u8		dr_reserved0;
+	__le16		dr_reserved1;
+	__le64		dr_dir_blkno;		/* Pointer to parent inode */
+	__le32		dr_num_entries;		/* Total number of
+						 * names stored in
+						 * this directory.*/
+	__le32		dr_reserved2;
+	__le64		dr_free_blk;		/* Pointer to head of free
+						 * unindexed block list. */
+	__le64		dr_reserved3[15];
+	union {
+		struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
+						   * bits for maximum space
+						   * efficiency. */
+		struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
+							* entries. We grow out
+							* to extents if this
+							* gets too big. */
+	};
+};
+
+/*
+ * The header of a leaf block in the indexed tree.
+ */
+struct ocfs2_dx_leaf {
+	__u8		dl_signature[8];/* Signature for verification */
+	struct ocfs2_block_check dl_check;	/* Error checking */
+	__le64		dl_blkno;	/* Offset on disk, in blocks */
+	__le32		dl_fs_generation;/* Must match super block */
+	__le32		dl_reserved0;
+	__le64		dl_reserved1;
+	struct ocfs2_dx_entry_list	dl_list;
+};
+
 /*
  * On disk allocator group structure for OCFS2
  */
@@ -1112,6 +1208,16 @@ static inline int ocfs2_extent_recs_per_inode_with_xattr(
 	return size / sizeof(struct ocfs2_extent_rec);
 }
 
+static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
+{
+	int size;
+
+	size = sb->s_blocksize -
+		offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
+
+	return size / sizeof(struct ocfs2_extent_rec);
+}
+
 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 {
 	int size;
@@ -1132,6 +1238,26 @@ static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 	return size / sizeof(struct ocfs2_extent_rec);
 }
 
+static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
+{
+	int size;
+
+	size = sb->s_blocksize -
+		offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
+
+	return size / sizeof(struct ocfs2_dx_entry);
+}
+
+static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
+{
+	int size;
+
+	size = sb->s_blocksize -
+		offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
+
+	return size / sizeof(struct ocfs2_dx_entry);
+}
+
 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 {
 	u16 size;
diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
index eb6f50c9cec..a53ce87481b 100644
--- a/fs/ocfs2/ocfs2_lockid.h
+++ b/fs/ocfs2/ocfs2_lockid.h
@@ -47,6 +47,7 @@ enum ocfs2_lock_type {
 	OCFS2_LOCK_TYPE_OPEN,
 	OCFS2_LOCK_TYPE_FLOCK,
 	OCFS2_LOCK_TYPE_QINFO,
+	OCFS2_LOCK_TYPE_NFS_SYNC,
 	OCFS2_NUM_LOCK_TYPES
 };
 
@@ -81,6 +82,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
 		case OCFS2_LOCK_TYPE_QINFO:
 			c = 'Q';
 			break;
+		case OCFS2_LOCK_TYPE_NFS_SYNC:
+			c = 'Y';
+			break;
 		default:
 			c = '\0';
 	}
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index a69628603e1..b4ca5911caa 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -48,7 +48,8 @@
 #include "buffer_head_io.h"
 
 #define NOT_ALLOC_NEW_GROUP		0
-#define ALLOC_NEW_GROUP			1
+#define ALLOC_NEW_GROUP			0x1
+#define ALLOC_GROUPS_FROM_GLOBAL	0x2
 
 #define OCFS2_MAX_INODES_TO_STEAL	1024
 
@@ -64,7 +65,9 @@ static int ocfs2_block_group_fill(handle_t *handle,
 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 				   struct inode *alloc_inode,
 				   struct buffer_head *bh,
-				   u64 max_block);
+				   u64 max_block,
+				   u64 *last_alloc_group,
+				   int flags);
 
 static int ocfs2_cluster_group_search(struct inode *inode,
 				      struct buffer_head *group_bh,
@@ -116,6 +119,7 @@ static inline void ocfs2_block_to_cluster_group(struct inode *inode,
 						u16 *bg_bit_off);
 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
 					     u32 bits_wanted, u64 max_block,
+					     int flags,
 					     struct ocfs2_alloc_context **ac);
 
 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
@@ -403,7 +407,9 @@ static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 				   struct inode *alloc_inode,
 				   struct buffer_head *bh,
-				   u64 max_block)
+				   u64 max_block,
+				   u64 *last_alloc_group,
+				   int flags)
 {
 	int status, credits;
 	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
@@ -423,7 +429,7 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 	cl = &fe->id2.i_chain;
 	status = ocfs2_reserve_clusters_with_limit(osb,
 						   le16_to_cpu(cl->cl_cpg),
-						   max_block, &ac);
+						   max_block, flags, &ac);
 	if (status < 0) {
 		if (status != -ENOSPC)
 			mlog_errno(status);
@@ -440,6 +446,11 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 		goto bail;
 	}
 
+	if (last_alloc_group && *last_alloc_group != 0) {
+		mlog(0, "use old allocation group %llu for block group alloc\n",
+		     (unsigned long long)*last_alloc_group);
+		ac->ac_last_group = *last_alloc_group;
+	}
 	status = ocfs2_claim_clusters(osb,
 				      handle,
 				      ac,
@@ -514,6 +525,11 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 	alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
 
 	status = 0;
+
+	/* save the new last alloc group so that the caller can cache it. */
+	if (last_alloc_group)
+		*last_alloc_group = ac->ac_last_group;
+
 bail:
 	if (handle)
 		ocfs2_commit_trans(osb, handle);
@@ -531,7 +547,8 @@ static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
 				       struct ocfs2_alloc_context *ac,
 				       int type,
 				       u32 slot,
-				       int alloc_new_group)
+				       u64 *last_alloc_group,
+				       int flags)
 {
 	int status;
 	u32 bits_wanted = ac->ac_bits_wanted;
@@ -587,7 +604,7 @@ static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
 			goto bail;
 		}
 
-		if (alloc_new_group != ALLOC_NEW_GROUP) {
+		if (!(flags & ALLOC_NEW_GROUP)) {
 			mlog(0, "Alloc File %u Full: wanted=%u, free_bits=%u, "
 			     "and we don't alloc a new group for it.\n",
 			     slot, bits_wanted, free_bits);
@@ -596,7 +613,8 @@ static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
 		}
 
 		status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
-						 ac->ac_max_block);
+						 ac->ac_max_block,
+						 last_alloc_group, flags);
 		if (status < 0) {
 			if (status != -ENOSPC)
 				mlog_errno(status);
@@ -640,7 +658,7 @@ int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
 
 	status = ocfs2_reserve_suballoc_bits(osb, (*ac),
 					     EXTENT_ALLOC_SYSTEM_INODE,
-					     slot, ALLOC_NEW_GROUP);
+					     slot, NULL, ALLOC_NEW_GROUP);
 	if (status < 0) {
 		if (status != -ENOSPC)
 			mlog_errno(status);
@@ -686,7 +704,8 @@ static int ocfs2_steal_inode_from_other_nodes(struct ocfs2_super *osb,
 
 		status = ocfs2_reserve_suballoc_bits(osb, ac,
 						     INODE_ALLOC_SYSTEM_INODE,
-						     slot, NOT_ALLOC_NEW_GROUP);
+						     slot, NULL,
+						     NOT_ALLOC_NEW_GROUP);
 		if (status >= 0) {
 			ocfs2_set_inode_steal_slot(osb, slot);
 			break;
@@ -703,6 +722,7 @@ int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
 {
 	int status;
 	s16 slot = ocfs2_get_inode_steal_slot(osb);
+	u64 alloc_group;
 
 	*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
 	if (!(*ac)) {
@@ -738,12 +758,22 @@ int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
 		goto inode_steal;
 
 	atomic_set(&osb->s_num_inodes_stolen, 0);
+	alloc_group = osb->osb_inode_alloc_group;
 	status = ocfs2_reserve_suballoc_bits(osb, *ac,
 					     INODE_ALLOC_SYSTEM_INODE,
-					     osb->slot_num, ALLOC_NEW_GROUP);
+					     osb->slot_num,
+					     &alloc_group,
+					     ALLOC_NEW_GROUP |
+					     ALLOC_GROUPS_FROM_GLOBAL);
 	if (status >= 0) {
 		status = 0;
 
+		spin_lock(&osb->osb_lock);
+		osb->osb_inode_alloc_group = alloc_group;
+		spin_unlock(&osb->osb_lock);
+		mlog(0, "after reservation, new allocation group is "
+		     "%llu\n", (unsigned long long)alloc_group);
+
 		/*
 		 * Some inodes must be freed by us, so try to allocate
 		 * from our own next time.
@@ -790,7 +820,7 @@ int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
 
 	status = ocfs2_reserve_suballoc_bits(osb, ac,
 					     GLOBAL_BITMAP_SYSTEM_INODE,
-					     OCFS2_INVALID_SLOT,
+					     OCFS2_INVALID_SLOT, NULL,
 					     ALLOC_NEW_GROUP);
 	if (status < 0 && status != -ENOSPC) {
 		mlog_errno(status);
@@ -806,6 +836,7 @@ bail:
  * things a bit. */
 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
 					     u32 bits_wanted, u64 max_block,
+					     int flags,
 					     struct ocfs2_alloc_context **ac)
 {
 	int status;
@@ -823,7 +854,8 @@ static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
 	(*ac)->ac_max_block = max_block;
 
 	status = -ENOSPC;
-	if (ocfs2_alloc_should_use_local(osb, bits_wanted)) {
+	if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
+	    ocfs2_alloc_should_use_local(osb, bits_wanted)) {
 		status = ocfs2_reserve_local_alloc_bits(osb,
 							bits_wanted,
 							*ac);
@@ -861,7 +893,8 @@ int ocfs2_reserve_clusters(struct ocfs2_super *osb,
 			   u32 bits_wanted,
 			   struct ocfs2_alloc_context **ac)
 {
-	return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0, ac);
+	return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
+						 ALLOC_NEW_GROUP, ac);
 }
 
 /*
@@ -1618,8 +1651,41 @@ bail:
 	return status;
 }
 
+static void ocfs2_init_inode_ac_group(struct inode *dir,
+				      struct buffer_head *parent_fe_bh,
+				      struct ocfs2_alloc_context *ac)
+{
+	struct ocfs2_dinode *fe = (struct ocfs2_dinode *)parent_fe_bh->b_data;
+	/*
+	 * Try to allocate inodes from some specific group.
+	 *
+	 * If the parent dir has recorded the last group used in allocation,
+	 * cool, use it. Otherwise if we try to allocate new inode from the
+	 * same slot the parent dir belongs to, use the same chunk.
+	 *
+	 * We are very careful here to avoid the mistake of setting
+	 * ac_last_group to a group descriptor from a different (unlocked) slot.
+	 */
+	if (OCFS2_I(dir)->ip_last_used_group &&
+	    OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
+		ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
+	else if (le16_to_cpu(fe->i_suballoc_slot) == ac->ac_alloc_slot)
+		ac->ac_last_group = ocfs2_which_suballoc_group(
+					le64_to_cpu(fe->i_blkno),
+					le16_to_cpu(fe->i_suballoc_bit));
+}
+
+static inline void ocfs2_save_inode_ac_group(struct inode *dir,
+					     struct ocfs2_alloc_context *ac)
+{
+	OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
+	OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
+}
+
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 			  handle_t *handle,
+			  struct inode *dir,
+			  struct buffer_head *parent_fe_bh,
 			  struct ocfs2_alloc_context *ac,
 			  u16 *suballoc_bit,
 			  u64 *fe_blkno)
@@ -1635,6 +1701,8 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 	BUG_ON(ac->ac_bits_wanted != 1);
 	BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
 
+	ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
+
 	status = ocfs2_claim_suballoc_bits(osb,
 					   ac,
 					   handle,
@@ -1653,6 +1721,7 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 
 	*fe_blkno = bg_blkno + (u64) (*suballoc_bit);
 	ac->ac_bits_given++;
+	ocfs2_save_inode_ac_group(dir, ac);
 	status = 0;
 bail:
 	mlog_exit(status);
@@ -2116,3 +2185,162 @@ out:
 
 	return ret;
 }
+
+/*
+ * Read the inode specified by blkno to get suballoc_slot and
+ * suballoc_bit.
+ */
+static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
+				       u16 *suballoc_slot, u16 *suballoc_bit)
+{
+	int status;
+	struct buffer_head *inode_bh = NULL;
+	struct ocfs2_dinode *inode_fe;
+
+	mlog_entry("blkno: %llu\n", blkno);
+
+	/* dirty read disk */
+	status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
+	if (status < 0) {
+		mlog(ML_ERROR, "read block %llu failed %d\n", blkno, status);
+		goto bail;
+	}
+
+	inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
+	if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
+		mlog(ML_ERROR, "invalid inode %llu requested\n", blkno);
+		status = -EINVAL;
+		goto bail;
+	}
+
+	if (le16_to_cpu(inode_fe->i_suballoc_slot) != OCFS2_INVALID_SLOT &&
+	    (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
+		mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
+		     blkno, (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
+		status = -EINVAL;
+		goto bail;
+	}
+
+	if (suballoc_slot)
+		*suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
+	if (suballoc_bit)
+		*suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
+
+bail:
+	brelse(inode_bh);
+
+	mlog_exit(status);
+	return status;
+}
+
+/*
+ * test whether bit is SET in allocator bitmap or not.  on success, 0
+ * is returned and *res is 1 for SET; 0 otherwise.  when fails, errno
+ * is returned and *res is meaningless.  Call this after you have
+ * cluster locked against suballoc, or you may get a result based on
+ * non-up2date contents
+ */
+static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
+				   struct inode *suballoc,
+				   struct buffer_head *alloc_bh, u64 blkno,
+				   u16 bit, int *res)
+{
+	struct ocfs2_dinode *alloc_fe;
+	struct ocfs2_group_desc *group;
+	struct buffer_head *group_bh = NULL;
+	u64 bg_blkno;
+	int status;
+
+	mlog_entry("blkno: %llu bit: %u\n", blkno, (unsigned int)bit);
+
+	alloc_fe = (struct ocfs2_dinode *)alloc_bh->b_data;
+	if ((bit + 1) > ocfs2_bits_per_group(&alloc_fe->id2.i_chain)) {
+		mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
+		     (unsigned int)bit,
+		     ocfs2_bits_per_group(&alloc_fe->id2.i_chain));
+		status = -EINVAL;
+		goto bail;
+	}
+
+	bg_blkno = ocfs2_which_suballoc_group(blkno, bit);
+	status = ocfs2_read_group_descriptor(suballoc, alloc_fe, bg_blkno,
+					     &group_bh);
+	if (status < 0) {
+		mlog(ML_ERROR, "read group %llu failed %d\n", bg_blkno, status);
+		goto bail;
+	}
+
+	group = (struct ocfs2_group_desc *) group_bh->b_data;
+	*res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
+
+bail:
+	brelse(group_bh);
+
+	mlog_exit(status);
+	return status;
+}
+
+/*
+ * Test if the bit representing this inode (blkno) is set in the
+ * suballocator.
+ *
+ * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
+ *
+ * In the event of failure, a negative value is returned and *res is
+ * meaningless.
+ *
+ * Callers must make sure to hold nfs_sync_lock to prevent
+ * ocfs2_delete_inode() on another node from accessing the same
+ * suballocator concurrently.
+ */
+int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
+{
+	int status;
+	u16 suballoc_bit = 0, suballoc_slot = 0;
+	struct inode *inode_alloc_inode;
+	struct buffer_head *alloc_bh = NULL;
+
+	mlog_entry("blkno: %llu", blkno);
+
+	status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
+					     &suballoc_bit);
+	if (status < 0) {
+		mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
+		goto bail;
+	}
+
+	inode_alloc_inode =
+		ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
+					    suballoc_slot);
+	if (!inode_alloc_inode) {
+		/* the error code could be inaccurate, but we are not able to
+		 * get the correct one. */
+		status = -EINVAL;
+		mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
+		     (u32)suballoc_slot);
+		goto bail;
+	}
+
+	mutex_lock(&inode_alloc_inode->i_mutex);
+	status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
+	if (status < 0) {
+		mutex_unlock(&inode_alloc_inode->i_mutex);
+		mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
+		     (u32)suballoc_slot, status);
+		goto bail;
+	}
+
+	status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
+					 blkno, suballoc_bit, res);
+	if (status < 0)
+		mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
+
+	ocfs2_inode_unlock(inode_alloc_inode, 0);
+	mutex_unlock(&inode_alloc_inode->i_mutex);
+
+	iput(inode_alloc_inode);
+	brelse(alloc_bh);
+bail:
+	mlog_exit(status);
+	return status;
+}
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index e3c13c77f9e..8c9a78a4316 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -88,6 +88,8 @@ int ocfs2_claim_metadata(struct ocfs2_super *osb,
 			 u64 *blkno_start);
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 			  handle_t *handle,
+			  struct inode *dir,
+			  struct buffer_head *parent_fe_bh,
 			  struct ocfs2_alloc_context *ac,
 			  u16 *suballoc_bit,
 			  u64 *fe_blkno);
@@ -186,4 +188,6 @@ int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et,
 			  u32 clusters_to_add, u32 extents_to_split,
 			  struct ocfs2_alloc_context **data_ac,
 			  struct ocfs2_alloc_context **meta_ac);
+
+int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res);
 #endif /* _CHAINALLOC_H_ */
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 7ac83a81ee5..79ff8d9d37e 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -201,6 +201,170 @@ static const match_table_t tokens = {
 	{Opt_err, NULL}
 };
 
+#ifdef CONFIG_DEBUG_FS
+static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
+{
+	int out = 0;
+	int i;
+	struct ocfs2_cluster_connection *cconn = osb->cconn;
+	struct ocfs2_recovery_map *rm = osb->recovery_map;
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
+			"Device", osb->dev_str, osb->uuid_str,
+			osb->fs_generation, osb->vol_label);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => State: %d  Flags: 0x%lX\n", "Volume",
+			atomic_read(&osb->vol_state), osb->osb_flags);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Block: %lu  Cluster: %d\n", "Sizes",
+			osb->sb->s_blocksize, osb->s_clustersize);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Compat: 0x%X  Incompat: 0x%X  "
+			"ROcompat: 0x%X\n",
+			"Features", osb->s_feature_compat,
+			osb->s_feature_incompat, osb->s_feature_ro_compat);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
+			osb->s_mount_opt, osb->s_atime_quantum);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Stack: %s  Name: %*s  Version: %d.%d\n",
+			"Cluster",
+			(*osb->osb_cluster_stack == '\0' ?
+			 "o2cb" : osb->osb_cluster_stack),
+			cconn->cc_namelen, cconn->cc_name,
+			cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
+
+	spin_lock(&osb->dc_task_lock);
+	out += snprintf(buf + out, len - out,
+			"%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
+			"WorkSeq: %lu\n", "DownCnvt",
+			task_pid_nr(osb->dc_task), osb->blocked_lock_count,
+			osb->dc_wake_sequence, osb->dc_work_sequence);
+	spin_unlock(&osb->dc_task_lock);
+
+	spin_lock(&osb->osb_lock);
+	out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
+			"Recovery",
+			(osb->recovery_thread_task ?
+			 task_pid_nr(osb->recovery_thread_task) : -1));
+	if (rm->rm_used == 0)
+		out += snprintf(buf + out, len - out, " None\n");
+	else {
+		for (i = 0; i < rm->rm_used; i++)
+			out += snprintf(buf + out, len - out, " %d",
+					rm->rm_entries[i]);
+		out += snprintf(buf + out, len - out, "\n");
+	}
+	spin_unlock(&osb->osb_lock);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
+			task_pid_nr(osb->commit_task), osb->osb_commit_interval,
+			atomic_read(&osb->needs_checkpoint));
+
+	out += snprintf(buf + out, len - out,
+			"%10s => State: %d  NumTxns: %d  TxnId: %lu\n",
+			"Journal", osb->journal->j_state,
+			atomic_read(&osb->journal->j_num_trans),
+			osb->journal->j_trans_id);
+
+	out += snprintf(buf + out, len - out,
+			"%10s => GlobalAllocs: %d  LocalAllocs: %d  "
+			"SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
+			"Stats",
+			atomic_read(&osb->alloc_stats.bitmap_data),
+			atomic_read(&osb->alloc_stats.local_data),
+			atomic_read(&osb->alloc_stats.bg_allocs),
+			atomic_read(&osb->alloc_stats.moves),
+			atomic_read(&osb->alloc_stats.bg_extends));
+
+	out += snprintf(buf + out, len - out,
+			"%10s => State: %u  Descriptor: %llu  Size: %u bits  "
+			"Default: %u bits\n",
+			"LocalAlloc", osb->local_alloc_state,
+			(unsigned long long)osb->la_last_gd,
+			osb->local_alloc_bits, osb->local_alloc_default_bits);
+
+	spin_lock(&osb->osb_lock);
+	out += snprintf(buf + out, len - out,
+			"%10s => Slot: %d  NumStolen: %d\n", "Steal",
+			osb->s_inode_steal_slot,
+			atomic_read(&osb->s_num_inodes_stolen));
+	spin_unlock(&osb->osb_lock);
+
+	out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
+			"Slots", "Num", "RecoGen");
+
+	for (i = 0; i < osb->max_slots; ++i) {
+		out += snprintf(buf + out, len - out,
+				"%10s  %c %3d  %10d\n",
+				" ",
+				(i == osb->slot_num ? '*' : ' '),
+				i, osb->slot_recovery_generations[i]);
+	}
+
+	return out;
+}
+
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+	struct ocfs2_super *osb = inode->i_private;
+	char *buf = NULL;
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		goto bail;
+
+	i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
+
+	file->private_data = buf;
+
+	return 0;
+bail:
+	return -ENOMEM;
+}
+
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+	kfree(file->private_data);
+	return 0;
+}
+
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+				size_t nbytes, loff_t *ppos)
+{
+	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+				       i_size_read(file->f_mapping->host));
+}
+#else
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+				size_t nbytes, loff_t *ppos)
+{
+	return 0;
+}
+#endif	/* CONFIG_DEBUG_FS */
+
+static struct file_operations ocfs2_osb_debug_fops = {
+	.open =		ocfs2_osb_debug_open,
+	.release =	ocfs2_debug_release,
+	.read =		ocfs2_debug_read,
+	.llseek =	generic_file_llseek,
+};
+
 /*
  * write_super and sync_fs ripped right out of ext3.
  */
@@ -926,6 +1090,16 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 		goto read_super_error;
 	}
 
+	osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
+					    osb->osb_debug_root,
+					    osb,
+					    &ocfs2_osb_debug_fops);
+	if (!osb->osb_ctxt) {
+		status = -EINVAL;
+		mlog_errno(status);
+		goto read_super_error;
+	}
+
 	status = ocfs2_mount_volume(sb);
 	if (osb->root_inode)
 		inode = igrab(osb->root_inode);
@@ -1620,6 +1794,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 	osb = OCFS2_SB(sb);
 	BUG_ON(!osb);
 
+	debugfs_remove(osb->osb_ctxt);
+
 	ocfs2_disable_quotas(osb);
 
 	ocfs2_shutdown_local_alloc(osb);
@@ -1742,6 +1918,12 @@ static int ocfs2_initialize_super(struct super_block *sb,
 	bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
 	sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
 
+	osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
+
+	for (i = 0; i < 3; i++)
+		osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
+	osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
+
 	osb->sb = sb;
 	/* Save off for ocfs2_rw_direct */
 	osb->s_sectsize_bits = blksize_bits(sector_size);
@@ -2130,6 +2312,12 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
 	 * lock, and it's marked as dirty, set the bit in the recover
 	 * map and launch a recovery thread for it. */
 	status = ocfs2_mark_dead_nodes(osb);
+	if (status < 0) {
+		mlog_errno(status);
+		goto finally;
+	}
+
+	status = ocfs2_compute_replay_slots(osb);
 	if (status < 0)
 		mlog_errno(status);
 
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 2563df89fc2..15631019dc6 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -512,7 +512,7 @@ int ocfs2_calc_xattr_init(struct inode *dir,
 			  struct ocfs2_security_xattr_info *si,
 			  int *want_clusters,
 			  int *xattr_credits,
-			  struct ocfs2_alloc_context **xattr_ac)
+			  int *want_meta)
 {
 	int ret = 0;
 	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
@@ -554,11 +554,7 @@ int ocfs2_calc_xattr_init(struct inode *dir,
 	if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 	    (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 	    (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
-		ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
-		if (ret) {
-			mlog_errno(ret);
-			return ret;
-		}
+		*want_meta = *want_meta + 1;
 		*xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 	}
 
diff --git a/fs/ocfs2/xattr.h b/fs/ocfs2/xattr.h
index 5a1ebc789f7..1ca7e9a1b7b 100644
--- a/fs/ocfs2/xattr.h
+++ b/fs/ocfs2/xattr.h
@@ -68,7 +68,7 @@ int ocfs2_calc_security_init(struct inode *,
 			     int *, int *, struct ocfs2_alloc_context **);
 int ocfs2_calc_xattr_init(struct inode *, struct buffer_head *,
 			  int, struct ocfs2_security_xattr_info *,
-			  int *, int *, struct ocfs2_alloc_context **);
+			  int *, int *, int *);
 
 /*
  * xattrs can live inside an inode, as part of an external xattr block,