[DLM] Remove range locks from the DLM

This patch removes support for range locking from the DLM

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

8 files changed, 11 insertions, 157 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 5080bbffd58..49deca845db 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -59,20 +59,6 @@ static void print_lock(struct seq_file *s, struct dlm_lkb *lkb,
 	    || lkb->lkb_status == DLM_LKSTS_WAITING)
 		seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
 
-	if (lkb->lkb_range) {
-		/* FIXME: this warns on Alpha */
-		if (lkb->lkb_status == DLM_LKSTS_CONVERT
-		    || lkb->lkb_status == DLM_LKSTS_GRANTED)
-			seq_printf(s, " %llx-%llx",
-				   lkb->lkb_range[GR_RANGE_START],
-				   lkb->lkb_range[GR_RANGE_END]);
-		if (lkb->lkb_status == DLM_LKSTS_CONVERT
-		    || lkb->lkb_status == DLM_LKSTS_WAITING)
-			seq_printf(s, " (%llx-%llx)",
-				   lkb->lkb_range[RQ_RANGE_START],
-				   lkb->lkb_range[RQ_RANGE_END]);
-	}
-
 	if (lkb->lkb_nodeid) {
 		if (lkb->lkb_nodeid != res->res_nodeid)
 			seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
diff --git a/fs/dlm/device.c b/fs/dlm/device.c
index 899d4f92a4d..99d8b6b07fb 100644
--- a/fs/dlm/device.c
+++ b/fs/dlm/device.c
@@ -532,8 +532,7 @@ static int dlm_close(struct inode *inode, struct file *file)
 			status = dlm_lock(f->fi_ls->ls_lockspace,
 					  old_li->li_grmode, &li.li_lksb,
 					  DLM_LKF_CONVERT|DLM_LKF_ORPHAN,
-					  NULL, 0, 0, ast_routine, NULL,
-					  NULL, NULL);
+					  NULL, 0, 0, ast_routine, NULL, NULL);
 			if (status != 0)
 				printk("dlm: Error orphaning lock %x: %d\n",
 				       old_li->li_lksb.sb_lkid, status);
@@ -878,8 +877,7 @@ static int do_user_lock(struct file_info *fi, uint8_t cmd,
 			  ast_routine,
 			  li,
 			  (li->li_pend_bastaddr || li->li_bastaddr) ?
-			   bast_routine : NULL,
-			  kparams->range.ra_end ? &kparams->range : NULL);
+			   bast_routine : NULL);
 	if (status)
 		goto out_err;
 
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 16f20cfd919..c3299020c8f 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -146,7 +146,6 @@ struct dlm_args {
 	void			*bastaddr;
 	int			mode;
 	struct dlm_lksb		*lksb;
-	struct dlm_range	*range;
 };
 
 
@@ -195,13 +194,6 @@ struct dlm_args {
 #define AST_COMP		1
 #define AST_BAST		2
 
-/* lkb_range[] */
-
-#define GR_RANGE_START		0
-#define GR_RANGE_END		1
-#define RQ_RANGE_START		2
-#define RQ_RANGE_END		3
-
 /* lkb_status */
 
 #define DLM_LKSTS_WAITING	1
@@ -212,7 +204,6 @@ struct dlm_args {
 
 #define DLM_IFL_MSTCPY		0x00010000
 #define DLM_IFL_RESEND		0x00020000
-#define DLM_IFL_RANGE		0x00000001
 
 struct dlm_lkb {
 	struct dlm_rsb		*lkb_resource;	/* the rsb */
@@ -241,7 +232,6 @@ struct dlm_lkb {
 	struct list_head	lkb_wait_reply;	/* waiting for remote reply */
 	struct list_head	lkb_astqueue;	/* need ast to be sent */
 
-	uint64_t		*lkb_range;	/* array of gr/rq ranges */
 	char			*lkb_lvbptr;
 	struct dlm_lksb		*lkb_lksb;      /* caller's status block */
 	void			*lkb_astaddr;	/* caller's ast function */
@@ -360,7 +350,6 @@ struct dlm_message {
 	int			m_bastmode;
 	int			m_asts;
 	int			m_result;	/* 0 or -EXXX */
-	uint64_t		m_range[2];
 	char			m_extra[0];	/* name or lvb */
 };
 
@@ -413,7 +402,6 @@ struct rcom_lock {
 	int8_t			rl_asts;
 	uint16_t		rl_wait_type;
 	uint16_t		rl_namelen;
-	uint64_t		rl_range[4];
 	char			rl_name[DLM_RESNAME_MAXLEN];
 	char			rl_lvb[0];
 };
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 29d3b95dbb6..80487703d58 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -606,8 +606,6 @@ static int put_lkb(struct dlm_lkb *lkb)
 		/* for local/process lkbs, lvbptr points to caller's lksb */
 		if (lkb->lkb_lvbptr && is_master_copy(lkb))
 			free_lvb(lkb->lkb_lvbptr);
-		if (lkb->lkb_range)
-			free_range(lkb->lkb_range);
 		free_lkb(lkb);
 		return 1;
 	} else {
@@ -988,11 +986,6 @@ static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 	}
 
 	lkb->lkb_rqmode = DLM_LOCK_IV;
-
-	if (lkb->lkb_range) {
-		lkb->lkb_range[GR_RANGE_START] = lkb->lkb_range[RQ_RANGE_START];
-		lkb->lkb_range[GR_RANGE_END] = lkb->lkb_range[RQ_RANGE_END];
-	}
 }
 
 static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
@@ -1032,21 +1025,6 @@ static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head)
 	return 0;
 }
 
-/* Return 1 if the locks' ranges overlap.  If the lkb has no range then it is
-   assumed to cover 0-ffffffff.ffffffff */
-
-static inline int ranges_overlap(struct dlm_lkb *lkb1, struct dlm_lkb *lkb2)
-{
-	if (!lkb1->lkb_range || !lkb2->lkb_range)
-		return 1;
-
-	if (lkb1->lkb_range[RQ_RANGE_END] < lkb2->lkb_range[GR_RANGE_START] ||
-	    lkb1->lkb_range[RQ_RANGE_START] > lkb2->lkb_range[GR_RANGE_END])
-		return 0;
-
-	return 1;
-}
-
 /* Check if the given lkb conflicts with another lkb on the queue. */
 
 static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
@@ -1056,7 +1034,7 @@ static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
 	list_for_each_entry(this, head, lkb_statequeue) {
 		if (this == lkb)
 			continue;
-		if (ranges_overlap(lkb, this) && !modes_compat(this, lkb))
+		if (!modes_compat(this, lkb))
 			return 1;
 	}
 	return 0;
@@ -1099,9 +1077,6 @@ static int conversion_deadlock_detect(struct dlm_rsb *rsb, struct dlm_lkb *lkb)
 			continue;
 		}
 
-		if (!ranges_overlap(lkb, this))
-			continue;
-
 		if (!modes_compat(this, lkb) && !modes_compat(lkb, this))
 			return 1;
 	}
@@ -1203,8 +1178,8 @@ static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now)
 		return 1;
 
 	/*
-	 * When using range locks the NOORDER flag is set to avoid the standard
-	 * vms rules on grant order.
+	 * The NOORDER flag is set to avoid the standard vms rules on grant
+	 * order.
 	 */
 
 	if (lkb->lkb_exflags & DLM_LKF_NOORDER)
@@ -1358,8 +1333,7 @@ static void grant_pending_locks(struct dlm_rsb *r)
 	/*
 	 * If there are locks left on the wait/convert queue then send blocking
 	 * ASTs to granted locks based on the largest requested mode (high)
-	 * found above.  This can generate spurious blocking ASTs for range
-	 * locks. FIXME: highbast < high comparison not valid for PR/CW.
+	 * found above. FIXME: highbast < high comparison not valid for PR/CW.
 	 */
 
 	list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
@@ -1379,7 +1353,7 @@ static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
 	list_for_each_entry(gr, head, lkb_statequeue) {
 		if (gr->lkb_bastaddr &&
 		    gr->lkb_highbast < lkb->lkb_rqmode &&
-		    ranges_overlap(lkb, gr) && !modes_compat(gr, lkb)) {
+		    !modes_compat(gr, lkb)) {
 			queue_bast(r, gr, lkb->lkb_rqmode);
 			gr->lkb_highbast = lkb->lkb_rqmode;
 		}
@@ -1530,8 +1504,7 @@ static void confirm_master(struct dlm_rsb *r, int error)
 
 static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
 			 int namelen, uint32_t parent_lkid, void *ast,
-			 void *astarg, void *bast, struct dlm_range *range,
-			 struct dlm_args *args)
+			 void *astarg, void *bast, struct dlm_args *args)
 {
 	int rv = -EINVAL;
 
@@ -1590,7 +1563,6 @@ static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
 	args->bastaddr = bast;
 	args->mode = mode;
 	args->lksb = lksb;
-	args->range = range;
 	rv = 0;
  out:
 	return rv;
@@ -1637,26 +1609,6 @@ static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	lkb->lkb_lksb = args->lksb;
 	lkb->lkb_lvbptr = args->lksb->sb_lvbptr;
 	lkb->lkb_ownpid = (int) current->pid;
-
-	rv = 0;
-	if (!args->range)
-		goto out;
-
-	if (!lkb->lkb_range) {
-		rv = -ENOMEM;
-		lkb->lkb_range = allocate_range(ls);
-		if (!lkb->lkb_range)
-			goto out;
-		/* This is needed for conversions that contain ranges
-		   where the original lock didn't but it's harmless for
-		   new locks too. */
-		lkb->lkb_range[GR_RANGE_START] = 0LL;
-		lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
-	}
-
-	lkb->lkb_range[RQ_RANGE_START] = args->range->ra_start;
-	lkb->lkb_range[RQ_RANGE_END] = args->range->ra_end;
-	lkb->lkb_flags |= DLM_IFL_RANGE;
 	rv = 0;
  out:
 	return rv;
@@ -1805,7 +1757,7 @@ static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 	return error;
 }
 
-/* change some property of an existing lkb, e.g. mode, range */
+/* change some property of an existing lkb, e.g. mode */
 
 static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 {
@@ -1962,8 +1914,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
 	     uint32_t parent_lkid,
 	     void (*ast) (void *astarg),
 	     void *astarg,
-	     void (*bast) (void *astarg, int mode),
-	     struct dlm_range *range)
+	     void (*bast) (void *astarg, int mode))
 {
 	struct dlm_ls *ls;
 	struct dlm_lkb *lkb;
@@ -1985,7 +1936,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
 		goto out;
 
 	error = set_lock_args(mode, lksb, flags, namelen, parent_lkid, ast,
-			      astarg, bast, range, &args);
+			      astarg, bast, &args);
 	if (error)
 		goto out_put;
 
@@ -2154,11 +2105,6 @@ static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb,
 	if (lkb->lkb_astaddr)
 		ms->m_asts |= AST_COMP;
 
-	if (lkb->lkb_range) {
-		ms->m_range[0] = lkb->lkb_range[RQ_RANGE_START];
-		ms->m_range[1] = lkb->lkb_range[RQ_RANGE_END];
-	}
-
 	if (ms->m_type == DLM_MSG_REQUEST || ms->m_type == DLM_MSG_LOOKUP)
 		memcpy(ms->m_extra, r->res_name, r->res_length);
 
@@ -2402,20 +2348,6 @@ static int receive_extralen(struct dlm_message *ms)
 	return (ms->m_header.h_length - sizeof(struct dlm_message));
 }
 
-static int receive_range(struct dlm_ls *ls, struct dlm_lkb *lkb,
-			 struct dlm_message *ms)
-{
-	if (lkb->lkb_flags & DLM_IFL_RANGE) {
-		if (!lkb->lkb_range)
-			lkb->lkb_range = allocate_range(ls);
-		if (!lkb->lkb_range)
-			return -ENOMEM;
-		lkb->lkb_range[RQ_RANGE_START] = ms->m_range[0];
-		lkb->lkb_range[RQ_RANGE_END] = ms->m_range[1];
-	}
-	return 0;
-}
-
 static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb,
 		       struct dlm_message *ms)
 {
@@ -2445,9 +2377,6 @@ static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 
 	DLM_ASSERT(is_master_copy(lkb), dlm_print_lkb(lkb););
 
-	if (receive_range(ls, lkb, ms))
-		return -ENOMEM;
-
 	if (receive_lvb(ls, lkb, ms))
 		return -ENOMEM;
 
@@ -2470,13 +2399,6 @@ static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	if (lkb->lkb_status != DLM_LKSTS_GRANTED)
 		return -EBUSY;
 
-	if (receive_range(ls, lkb, ms))
-		return -ENOMEM;
-	if (lkb->lkb_range) {
-		lkb->lkb_range[GR_RANGE_START] = 0LL;
-		lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
-	}
-
 	if (receive_lvb(ls, lkb, ms))
 		return -ENOMEM;
 
@@ -3476,13 +3398,6 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	lkb->lkb_bastaddr = (void *) (long) (rl->rl_asts & AST_BAST);
 	lkb->lkb_astaddr = (void *) (long) (rl->rl_asts & AST_COMP);
 
-	if (lkb->lkb_flags & DLM_IFL_RANGE) {
-		lkb->lkb_range = allocate_range(ls);
-		if (!lkb->lkb_range)
-			return -ENOMEM;
-		memcpy(lkb->lkb_range, rl->rl_range, 4*sizeof(uint64_t));
-	}
-
 	if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
 		lkb->lkb_lvbptr = allocate_lvb(ls);
 		if (!lkb->lkb_lvbptr)
diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index 0b9851d0bdb..f7cf4589fae 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -50,22 +50,6 @@ void free_lvb(char *p)
 	kfree(p);
 }
 
-uint64_t *allocate_range(struct dlm_ls *ls)
-{
-	int ralen = 4*sizeof(uint64_t);
-	uint64_t *p;
-
-	p = kmalloc(ralen, GFP_KERNEL);
-	if (p)
-		memset(p, 0, ralen);
-	return p;
-}
-
-void free_range(uint64_t *p)
-{
-	kfree(p);
-}
-
 /* FIXME: have some minimal space built-in to rsb for the name and
    kmalloc a separate name if needed, like dentries are done */
 
diff --git a/fs/dlm/memory.h b/fs/dlm/memory.h
index 7b235132b0b..6ead158ccc5 100644
--- a/fs/dlm/memory.h
+++ b/fs/dlm/memory.h
@@ -24,8 +24,6 @@ struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen);
 void free_direntry(struct dlm_direntry *de);
 char *allocate_lvb(struct dlm_ls *ls);
 void free_lvb(char *l);
-uint64_t *allocate_range(struct dlm_ls *ls);
-void free_range(uint64_t *l);
 
 #endif		/* __MEMORY_DOT_H__ */
 
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index 4c5c08a8860..55fbe313340 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -284,9 +284,6 @@ static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 	if (lkb->lkb_astaddr)
 		rl->rl_asts |= AST_COMP;
 
-	if (lkb->lkb_range)
-		memcpy(rl->rl_range, lkb->lkb_range, 4*sizeof(uint64_t));
-
 	rl->rl_namelen = r->res_length;
 	memcpy(rl->rl_name, r->res_name, r->res_length);
 
diff --git a/fs/dlm/util.c b/fs/dlm/util.c
index 826d122edf5..767197db994 100644
--- a/fs/dlm/util.c
+++ b/fs/dlm/util.c
@@ -54,8 +54,6 @@ void dlm_message_out(struct dlm_message *ms)
 	ms->m_bastmode		= cpu_to_le32(ms->m_bastmode);
 	ms->m_asts		= cpu_to_le32(ms->m_asts);
 	ms->m_result		= cpu_to_le32(ms->m_result);
-	ms->m_range[0]		= cpu_to_le64(ms->m_range[0]);
-	ms->m_range[1]		= cpu_to_le64(ms->m_range[1]);
 }
 
 void dlm_message_in(struct dlm_message *ms)
@@ -82,8 +80,6 @@ void dlm_message_in(struct dlm_message *ms)
 	ms->m_bastmode		= le32_to_cpu(ms->m_bastmode);
 	ms->m_asts		= le32_to_cpu(ms->m_asts);
 	ms->m_result		= le32_to_cpu(ms->m_result);
-	ms->m_range[0]		= le64_to_cpu(ms->m_range[0]);
-	ms->m_range[1]		= le64_to_cpu(ms->m_range[1]);
 }
 
 static void rcom_lock_out(struct rcom_lock *rl)
@@ -99,10 +95,6 @@ static void rcom_lock_out(struct rcom_lock *rl)
 	rl->rl_result		= cpu_to_le32(rl->rl_result);
 	rl->rl_wait_type	= cpu_to_le16(rl->rl_wait_type);
 	rl->rl_namelen		= cpu_to_le16(rl->rl_namelen);
-	rl->rl_range[0]		= cpu_to_le64(rl->rl_range[0]);
-	rl->rl_range[1]		= cpu_to_le64(rl->rl_range[1]);
-	rl->rl_range[2]		= cpu_to_le64(rl->rl_range[2]);
-	rl->rl_range[3]		= cpu_to_le64(rl->rl_range[3]);
 }
 
 static void rcom_lock_in(struct rcom_lock *rl)
@@ -118,10 +110,6 @@ static void rcom_lock_in(struct rcom_lock *rl)
 	rl->rl_result		= le32_to_cpu(rl->rl_result);
 	rl->rl_wait_type	= le16_to_cpu(rl->rl_wait_type);
 	rl->rl_namelen		= le16_to_cpu(rl->rl_namelen);
-	rl->rl_range[0]		= le64_to_cpu(rl->rl_range[0]);
-	rl->rl_range[1]		= le64_to_cpu(rl->rl_range[1]);
-	rl->rl_range[2]		= le64_to_cpu(rl->rl_range[2]);
-	rl->rl_range[3]		= le64_to_cpu(rl->rl_range[3]);
 }
 
 static void rcom_config_out(struct rcom_config *rf)