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-rw-r--r--fs/ocfs2/localalloc.c198
-rw-r--r--fs/ocfs2/localalloc.h4
-rw-r--r--fs/ocfs2/ocfs2.h23
-rw-r--r--fs/ocfs2/suballoc.c31
-rw-r--r--fs/ocfs2/suballoc.h1
-rw-r--r--fs/ocfs2/super.c4
6 files changed, 230 insertions, 31 deletions
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index b05ce664291..f71658adddb 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -73,16 +73,51 @@ 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);
+static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
+{
+ return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
+ osb->local_alloc_state == OCFS2_LA_ENABLED);
+}
+
+void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
+ unsigned int num_clusters)
+{
+ spin_lock(&osb->osb_lock);
+ if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
+ osb->local_alloc_state == OCFS2_LA_THROTTLED)
+ if (num_clusters >= osb->local_alloc_default_bits) {
+ cancel_delayed_work(&osb->la_enable_wq);
+ osb->local_alloc_state = OCFS2_LA_ENABLED;
+ }
+ spin_unlock(&osb->osb_lock);
+}
+
+void ocfs2_la_enable_worker(struct work_struct *work)
+{
+ struct ocfs2_super *osb =
+ container_of(work, struct ocfs2_super,
+ la_enable_wq.work);
+ spin_lock(&osb->osb_lock);
+ osb->local_alloc_state = OCFS2_LA_ENABLED;
+ spin_unlock(&osb->osb_lock);
+}
+
/*
* Tell us whether a given allocation should use the local alloc
* file. Otherwise, it has to go to the main bitmap.
+ *
+ * This function does semi-dirty reads of local alloc size and state!
+ * This is ok however, as the values are re-checked once under mutex.
*/
int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
{
- int la_bits = osb->local_alloc_bits;
int ret = 0;
+ int la_bits;
+
+ spin_lock(&osb->osb_lock);
+ la_bits = osb->local_alloc_bits;
- if (osb->local_alloc_state != OCFS2_LA_ENABLED)
+ if (!ocfs2_la_state_enabled(osb))
goto bail;
/* la_bits should be at least twice the size (in clusters) of
@@ -96,6 +131,7 @@ int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
bail:
mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
+ spin_unlock(&osb->osb_lock);
return ret;
}
@@ -208,6 +244,9 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
mlog_entry_void();
+ cancel_delayed_work(&osb->la_enable_wq);
+ flush_workqueue(ocfs2_wq);
+
if (osb->local_alloc_state == OCFS2_LA_UNUSED)
goto out;
@@ -445,7 +484,7 @@ out:
}
/*
- * make sure we've got at least bitswanted contiguous bits in the
+ * make sure we've got at least bits_wanted contiguous bits in the
* local alloc. You lose them when you drop i_mutex.
*
* We will add ourselves to the transaction passed in, but may start
@@ -476,16 +515,18 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
mutex_lock(&local_alloc_inode->i_mutex);
- if (osb->local_alloc_state != OCFS2_LA_ENABLED) {
- status = -ENOSPC;
- goto bail;
- }
-
- if (bits_wanted > osb->local_alloc_bits) {
- mlog(0, "Asking for more than my max window size!\n");
+ /*
+ * We must double check state and allocator bits because
+ * another process may have changed them while holding i_mutex.
+ */
+ spin_lock(&osb->osb_lock);
+ if (!ocfs2_la_state_enabled(osb) ||
+ (bits_wanted > osb->local_alloc_bits)) {
+ spin_unlock(&osb->osb_lock);
status = -ENOSPC;
goto bail;
}
+ spin_unlock(&osb->osb_lock);
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
@@ -513,6 +554,21 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
mlog_errno(status);
goto bail;
}
+
+ /*
+ * Under certain conditions, the window slide code
+ * might have reduced the number of bits available or
+ * disabled the the local alloc entirely. Re-check
+ * here and return -ENOSPC if necessary.
+ */
+ status = -ENOSPC;
+ if (!ocfs2_la_state_enabled(osb))
+ goto bail;
+
+ free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
+ le32_to_cpu(alloc->id1.bitmap1.i_used);
+ if (bits_wanted > free_bits)
+ goto bail;
}
ac->ac_inode = local_alloc_inode;
@@ -780,6 +836,85 @@ bail:
return status;
}
+enum ocfs2_la_event {
+ OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
+ OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
+ * enough bits theoretically
+ * free, but a contiguous
+ * allocation could not be
+ * found. */
+ OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
+ * enough bits free to satisfy
+ * our request. */
+};
+#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
+/*
+ * Given an event, calculate the size of our next local alloc window.
+ *
+ * This should always be called under i_mutex of the local alloc inode
+ * so that local alloc disabling doesn't race with processes trying to
+ * use the allocator.
+ *
+ * Returns the state which the local alloc was left in. This value can
+ * be ignored by some paths.
+ */
+static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
+ enum ocfs2_la_event event)
+{
+ unsigned int bits;
+ int state;
+
+ spin_lock(&osb->osb_lock);
+ if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
+ WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
+ goto out_unlock;
+ }
+
+ /*
+ * ENOSPC and fragmentation are treated similarly for now.
+ */
+ if (event == OCFS2_LA_EVENT_ENOSPC ||
+ event == OCFS2_LA_EVENT_FRAGMENTED) {
+ /*
+ * We ran out of contiguous space in the primary
+ * bitmap. Drastically reduce the number of bits used
+ * by local alloc until we have to disable it.
+ */
+ bits = osb->local_alloc_bits >> 1;
+ if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
+ /*
+ * By setting state to THROTTLED, we'll keep
+ * the number of local alloc bits used down
+ * until an event occurs which would give us
+ * reason to assume the bitmap situation might
+ * have changed.
+ */
+ osb->local_alloc_state = OCFS2_LA_THROTTLED;
+ osb->local_alloc_bits = bits;
+ } else {
+ osb->local_alloc_state = OCFS2_LA_DISABLED;
+ }
+ queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
+ OCFS2_LA_ENABLE_INTERVAL);
+ goto out_unlock;
+ }
+
+ /*
+ * Don't increase the size of the local alloc window until we
+ * know we might be able to fulfill the request. Otherwise, we
+ * risk bouncing around the global bitmap during periods of
+ * low space.
+ */
+ if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
+ osb->local_alloc_bits = osb->local_alloc_default_bits;
+
+out_unlock:
+ state = osb->local_alloc_state;
+ spin_unlock(&osb->osb_lock);
+
+ return state;
+}
+
static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
struct ocfs2_alloc_context **ac,
struct inode **bitmap_inode,
@@ -794,12 +929,21 @@ static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
goto bail;
}
+retry_enospc:
(*ac)->ac_bits_wanted = osb->local_alloc_bits;
status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
+ if (status == -ENOSPC) {
+ if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
+ OCFS2_LA_DISABLED)
+ goto bail;
+
+ ocfs2_free_ac_resource(*ac);
+ memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
+ goto retry_enospc;
+ }
if (status < 0) {
- if (status != -ENOSPC)
- mlog_errno(status);
+ mlog_errno(status);
goto bail;
}
@@ -852,6 +996,34 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
* the more specific cluster api to claim bits. */
status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
&cluster_off, &cluster_count);
+ if (status == -ENOSPC) {
+retry_enospc:
+ /*
+ * Note: We could also try syncing the journal here to
+ * allow use of any free bits which the current
+ * transaction can't give us access to. --Mark
+ */
+ if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
+ OCFS2_LA_DISABLED)
+ goto bail;
+
+ status = ocfs2_claim_clusters(osb, handle, ac,
+ osb->local_alloc_bits,
+ &cluster_off,
+ &cluster_count);
+ if (status == -ENOSPC)
+ goto retry_enospc;
+ /*
+ * We only shrunk the *minimum* number of in our
+ * request - it's entirely possible that the allocator
+ * might give us more than we asked for.
+ */
+ if (status == 0) {
+ spin_lock(&osb->osb_lock);
+ osb->local_alloc_bits = cluster_count;
+ spin_unlock(&osb->osb_lock);
+ }
+ }
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@@ -895,6 +1067,8 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
mlog_entry_void();
+ ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
+
/* This will lock the main bitmap for us. */
status = ocfs2_local_alloc_reserve_for_window(osb,
&ac,
diff --git a/fs/ocfs2/localalloc.h b/fs/ocfs2/localalloc.h
index 3f76631e110..ac5ea9f8665 100644
--- a/fs/ocfs2/localalloc.h
+++ b/fs/ocfs2/localalloc.h
@@ -52,4 +52,8 @@ int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
u32 *bit_off,
u32 *num_bits);
+void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
+ unsigned int num_clusters);
+void ocfs2_la_enable_worker(struct work_struct *work);
+
#endif /* OCFS2_LOCALALLOC_H */
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 43dd42e313a..4d6e200a484 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -171,9 +171,13 @@ struct ocfs2_alloc_stats
enum ocfs2_local_alloc_state
{
- OCFS2_LA_UNUSED = 0,
- OCFS2_LA_ENABLED,
- OCFS2_LA_DISABLED
+ OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
+ * this mountpoint. */
+ OCFS2_LA_ENABLED, /* Local alloc is in use. */
+ OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
+ * of bits has been reduced. */
+ OCFS2_LA_DISABLED /* Local alloc has temporarily been
+ * disabled. */
};
enum ocfs2_mount_options
@@ -252,9 +256,20 @@ struct ocfs2_super
struct ocfs2_journal *journal;
unsigned long osb_commit_interval;
+ struct delayed_work la_enable_wq;
+
+ /*
+ * Must hold local alloc i_mutex and osb->osb_lock to change
+ * local_alloc_bits. Reads can be done under either lock.
+ */
unsigned int local_alloc_bits;
- enum ocfs2_local_alloc_state local_alloc_state;
+ unsigned int local_alloc_default_bits;
+
+ enum ocfs2_local_alloc_state local_alloc_state; /* protected
+ * by osb_lock */
+
struct buffer_head *local_alloc_bh;
+
u64 la_last_gd;
/* Next two fields are for local node slot recovery during
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index d2d278fb981..de7b93d76d1 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -111,7 +111,7 @@ static inline void ocfs2_block_to_cluster_group(struct inode *inode,
u64 *bg_blkno,
u16 *bg_bit_off);
-static void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
{
struct inode *inode = ac->ac_inode;
@@ -686,15 +686,6 @@ int ocfs2_reserve_clusters(struct ocfs2_super *osb,
if ((status < 0) && (status != -ENOSPC)) {
mlog_errno(status);
goto bail;
- } else if (status == -ENOSPC) {
- /* reserve_local_bits will return enospc with
- * the local alloc inode still locked, so we
- * can change this safely here. */
- mlog(0, "Disabling local alloc\n");
- /* We set to OCFS2_LA_DISABLED so that umount
- * can clean up what's left of the local
- * allocation */
- osb->local_alloc_state = OCFS2_LA_DISABLED;
}
}
@@ -1005,6 +996,7 @@ static int ocfs2_cluster_group_search(struct inode *inode,
int search = -ENOSPC;
int ret;
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
u16 tmp_off, tmp_found;
unsigned int max_bits, gd_cluster_off;
@@ -1045,6 +1037,12 @@ static int ocfs2_cluster_group_search(struct inode *inode,
*bit_off = tmp_off;
*bits_found = tmp_found;
search = 0; /* success */
+ } else if (tmp_found) {
+ /*
+ * Don't show bits which we'll be returning
+ * for allocation to the local alloc bitmap.
+ */
+ ocfs2_local_alloc_seen_free_bits(osb, tmp_found);
}
}
@@ -1203,9 +1201,8 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
status = -ENOSPC;
/* for now, the chain search is a bit simplistic. We just use
* the 1st group with any empty bits. */
- while ((status = ac->ac_group_search(alloc_inode, group_bh,
- bits_wanted, min_bits, bit_off,
- &tmp_bits)) == -ENOSPC) {
+ while ((status = ac->ac_group_search(alloc_inode, group_bh, bits_wanted,
+ min_bits, bit_off, &tmp_bits)) == -ENOSPC) {
if (!bg->bg_next_group)
break;
@@ -1838,9 +1835,15 @@ int ocfs2_free_clusters(handle_t *handle,
status = ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
bg_start_bit, bg_blkno,
num_clusters);
- if (status < 0)
+ if (status < 0) {
mlog_errno(status);
+ goto out;
+ }
+
+ ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
+ num_clusters);
+out:
mlog_exit(status);
return status;
}
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index 544c600662b..40d51daf5fb 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -147,6 +147,7 @@ static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
* apis above. */
int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac);
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
/* given a cluster offset, calculate which block group it belongs to
* and return that block offset. */
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 3dee61ebd69..a2d3dcf7025 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -637,7 +637,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
osb->s_atime_quantum = parsed_options.atime_quantum;
osb->preferred_slot = parsed_options.slot;
osb->osb_commit_interval = parsed_options.commit_interval;
- osb->local_alloc_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
+ osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
+ osb->local_alloc_bits = osb->local_alloc_default_bits;
status = ocfs2_verify_userspace_stack(osb, &parsed_options);
if (status)
@@ -1425,6 +1426,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
osb->local_alloc_state = OCFS2_LA_UNUSED;
osb->local_alloc_bh = NULL;
+ INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
init_waitqueue_head(&osb->osb_mount_event);