X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fgfs2%2Fglock.c;h=454d4b4eb36ba7f5b12111cd86730eef90ddc65c;hb=2132deff694765bc2e6c7ac84c6b30dab0775256;hp=c962283d4e7ff174ffe9d2eb719319f863eca2c2;hpb=719ee344675c2efed9115934f19aa66a526b6e5b;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index c962283..454d4b4 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -10,7 +10,6 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
-#include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/delay.h>
 #include <linux/sort.h>
@@ -18,10 +17,8 @@
 #include <linux/kallsyms.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/list.h>
-#include <linux/lm_interface.h>
 #include <linux/wait.h>
 #include <linux/module.h>
-#include <linux/rwsem.h>
 #include <asm/uaccess.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
@@ -40,6 +37,9 @@
 #include "quota.h"
 #include "super.h"
 #include "util.h"
+#include "bmap.h"
+#define CREATE_TRACE_POINTS
+#include "trace_gfs2.h"
 
 struct gfs2_gl_hash_bucket {
         struct hlist_head hb_list;
@@ -59,11 +59,12 @@ static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl);
 #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { __dump_glock(NULL, gl); BUG(); } } while(0)
 static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target);
 
-static DECLARE_RWSEM(gfs2_umount_flush_sem);
 static struct dentry *gfs2_root;
-static struct task_struct *scand_process;
-static unsigned int scand_secs = 5;
 static struct workqueue_struct *glock_workqueue;
+struct workqueue_struct *gfs2_delete_workqueue;
+static LIST_HEAD(lru_list);
+static atomic_t lru_count = ATOMIC_INIT(0);
+static DEFINE_SPINLOCK(lru_lock);
 
 #define GFS2_GL_HASH_SHIFT      15
 #define GFS2_GL_HASH_SIZE       (1 << GFS2_GL_HASH_SHIFT)
@@ -151,15 +152,14 @@ static unsigned int gl_hash(const struct gfs2_sbd *sdp,
 static void glock_free(struct gfs2_glock *gl)
 {
 	struct gfs2_sbd *sdp = gl->gl_sbd;
-	struct inode *aspace = gl->gl_aspace;
+	struct address_space *mapping = gfs2_glock2aspace(gl);
+	struct kmem_cache *cachep = gfs2_glock_cachep;
 
-	if (sdp->sd_lockstruct.ls_ops->lm_put_lock)
-		sdp->sd_lockstruct.ls_ops->lm_put_lock(gl->gl_lock);
-
-	if (aspace)
-		gfs2_aspace_put(aspace);
-
-	kmem_cache_free(gfs2_glock_cachep, gl);
+	GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
+	trace_gfs2_glock_put(gl);
+	if (mapping)
+		cachep = gfs2_glock_aspace_cachep;
+	sdp->sd_lockstruct.ls_ops->lm_put_lock(cachep, gl);
 }
 
 /**
@@ -168,12 +168,69 @@ static void glock_free(struct gfs2_glock *gl)
  *
  */
 
-static void gfs2_glock_hold(struct gfs2_glock *gl)
+void gfs2_glock_hold(struct gfs2_glock *gl)
 {
+	GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0);
 	atomic_inc(&gl->gl_ref);
 }
 
 /**
+ * demote_ok - Check to see if it's ok to unlock a glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int demote_ok(const struct gfs2_glock *gl)
+{
+	const struct gfs2_glock_operations *glops = gl->gl_ops;
+
+	if (gl->gl_state == LM_ST_UNLOCKED)
+		return 0;
+	if (!list_empty(&gl->gl_holders))
+		return 0;
+	if (glops->go_demote_ok)
+		return glops->go_demote_ok(gl);
+	return 1;
+}
+
+/**
+ * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list
+ * @gl: the glock
+ *
+ */
+
+static void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl)
+{
+	int may_reclaim;
+	may_reclaim = (demote_ok(gl) &&
+		       (atomic_read(&gl->gl_ref) == 1 ||
+			(gl->gl_name.ln_type == LM_TYPE_INODE &&
+			 atomic_read(&gl->gl_ref) <= 2)));
+	spin_lock(&lru_lock);
+	if (list_empty(&gl->gl_lru) && may_reclaim) {
+		list_add_tail(&gl->gl_lru, &lru_list);
+		atomic_inc(&lru_count);
+	}
+	spin_unlock(&lru_lock);
+}
+
+/**
+ * gfs2_glock_put_nolock() - Decrement reference count on glock
+ * @gl: The glock to put
+ *
+ * This function should only be used if the caller has its own reference
+ * to the glock, in addition to the one it is dropping.
+ */
+
+void gfs2_glock_put_nolock(struct gfs2_glock *gl)
+{
+	if (atomic_dec_and_test(&gl->gl_ref))
+		GLOCK_BUG_ON(gl, 1);
+	gfs2_glock_schedule_for_reclaim(gl);
+}
+
+/**
  * gfs2_glock_put() - Decrement reference count on glock
  * @gl: The glock to put
  *
@@ -184,16 +241,22 @@ int gfs2_glock_put(struct gfs2_glock *gl)
 	int rv = 0;
 
 	write_lock(gl_lock_addr(gl->gl_hash));
-	if (atomic_dec_and_test(&gl->gl_ref)) {
+	if (atomic_dec_and_lock(&gl->gl_ref, &lru_lock)) {
 		hlist_del(&gl->gl_list);
+		if (!list_empty(&gl->gl_lru)) {
+			list_del_init(&gl->gl_lru);
+			atomic_dec(&lru_count);
+		}
+		spin_unlock(&lru_lock);
 		write_unlock(gl_lock_addr(gl->gl_hash));
-		GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_UNLOCKED);
-		GLOCK_BUG_ON(gl, !list_empty(&gl->gl_reclaim));
 		GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
 		glock_free(gl);
 		rv = 1;
 		goto out;
 	}
+	spin_lock(&gl->gl_spin);
+	gfs2_glock_schedule_for_reclaim(gl);
+	spin_unlock(&gl->gl_spin);
 	write_unlock(gl_lock_addr(gl->gl_hash));
 out:
 	return rv;
@@ -229,27 +292,6 @@ static struct gfs2_glock *search_bucket(unsigned int hash,
 }
 
 /**
- * gfs2_glock_find() - Find glock by lock number
- * @sdp: The GFS2 superblock
- * @name: The lock name
- *
- * Returns: NULL, or the struct gfs2_glock with the requested number
- */
-
-static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp,
-					  const struct lm_lockname *name)
-{
-	unsigned int hash = gl_hash(sdp, name);
-	struct gfs2_glock *gl;
-
-	read_lock(gl_lock_addr(hash));
-	gl = search_bucket(hash, sdp, name);
-	read_unlock(gl_lock_addr(hash));
-
-	return gl;
-}
-
-/**
  * may_grant - check if its ok to grant a new lock
  * @gl: The glock
  * @gh: The lock request which we wish to grant
@@ -289,10 +331,13 @@ static void gfs2_holder_wake(struct gfs2_holder *gh)
  * do_promote - promote as many requests as possible on the current queue
  * @gl: The glock
  * 
- * Returns: true if there is a blocked holder at the head of the list
+ * Returns: 1 if there is a blocked holder at the head of the list, or 2
+ *          if a type specific operation is underway.
  */
 
 static int do_promote(struct gfs2_glock *gl)
+__releases(&gl->gl_spin)
+__acquires(&gl->gl_spin)
 {
 	const struct gfs2_glock_operations *glops = gl->gl_ops;
 	struct gfs2_holder *gh, *tmp;
@@ -310,16 +355,21 @@ restart:
 				ret = glops->go_lock(gh);
 				spin_lock(&gl->gl_spin);
 				if (ret) {
+					if (ret == 1)
+						return 2;
 					gh->gh_error = ret;
 					list_del_init(&gh->gh_list);
+					trace_gfs2_glock_queue(gh, 0);
 					gfs2_holder_wake(gh);
 					goto restart;
 				}
 				set_bit(HIF_HOLDER, &gh->gh_iflags);
+				trace_gfs2_promote(gh, 1);
 				gfs2_holder_wake(gh);
 				goto restart;
 			}
 			set_bit(HIF_HOLDER, &gh->gh_iflags);
+			trace_gfs2_promote(gh, 0);
 			gfs2_holder_wake(gh);
 			continue;
 		}
@@ -349,6 +399,7 @@ static inline void do_error(struct gfs2_glock *gl, const int ret)
 		else
 			continue;
 		list_del_init(&gh->gh_list);
+		trace_gfs2_glock_queue(gh, 0);
 		gfs2_holder_wake(gh);
 	}
 }
@@ -387,7 +438,7 @@ static void state_change(struct gfs2_glock *gl, unsigned int new_state)
 		if (held2)
 			gfs2_glock_hold(gl);
 		else
-			gfs2_glock_put(gl);
+			gfs2_glock_put_nolock(gl);
 	}
 
 	gl->gl_state = new_state;
@@ -414,8 +465,10 @@ static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
 	const struct gfs2_glock_operations *glops = gl->gl_ops;
 	struct gfs2_holder *gh;
 	unsigned state = ret & LM_OUT_ST_MASK;
+	int rv;
 
 	spin_lock(&gl->gl_spin);
+	trace_gfs2_glock_state_change(gl, state);
 	state_change(gl, state);
 	gh = find_first_waiter(gl);
 
@@ -459,7 +512,6 @@ retry:
 			GLOCK_BUG_ON(gl, 1);
 		}
 		spin_unlock(&gl->gl_spin);
-		gfs2_glock_put(gl);
 		return;
 	}
 
@@ -468,27 +520,26 @@ retry:
 		gfs2_demote_wake(gl);
 	if (state != LM_ST_UNLOCKED) {
 		if (glops->go_xmote_bh) {
-			int rv;
 			spin_unlock(&gl->gl_spin);
 			rv = glops->go_xmote_bh(gl, gh);
-			if (rv == -EAGAIN)
-				return;
 			spin_lock(&gl->gl_spin);
 			if (rv) {
 				do_error(gl, rv);
 				goto out;
 			}
 		}
-		do_promote(gl);
+		rv = do_promote(gl);
+		if (rv == 2)
+			goto out_locked;
 	}
 out:
 	clear_bit(GLF_LOCK, &gl->gl_flags);
+out_locked:
 	spin_unlock(&gl->gl_spin);
-	gfs2_glock_put(gl);
 }
 
 static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
-				 unsigned int cur_state, unsigned int req_state,
+				 unsigned int req_state,
 				 unsigned int flags)
 {
 	int ret = LM_OUT_ERROR;
@@ -497,7 +548,7 @@ static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
 		return req_state == LM_ST_UNLOCKED ? 0 : req_state;
 
 	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-		ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock, cur_state,
+		ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
 							 req_state, flags);
 	return ret;
 }
@@ -511,6 +562,8 @@ static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
  */
 
 static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
+__releases(&gl->gl_spin)
+__acquires(&gl->gl_spin)
 {
 	const struct gfs2_glock_operations *glops = gl->gl_ops;
 	struct gfs2_sbd *sdp = gl->gl_sbd;
@@ -538,11 +591,10 @@ static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int
 	    gl->gl_state == LM_ST_DEFERRED) &&
 	    !(lck_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
 		lck_flags |= LM_FLAG_TRY_1CB;
-	ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, target, lck_flags);
+	ret = gfs2_lm_lock(sdp, gl, target, lck_flags);
 
 	if (!(ret & LM_OUT_ASYNC)) {
 		finish_xmote(gl, ret);
-		gfs2_glock_hold(gl);
 		if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
 			gfs2_glock_put(gl);
 	} else {
@@ -576,8 +628,11 @@ static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl)
  */
 
 static void run_queue(struct gfs2_glock *gl, const int nonblock)
+__releases(&gl->gl_spin)
+__acquires(&gl->gl_spin)
 {
 	struct gfs2_holder *gh = NULL;
+	int ret;
 
 	if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
 		return;
@@ -587,7 +642,7 @@ static void run_queue(struct gfs2_glock *gl, const int nonblock)
 	if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
 	    gl->gl_demote_state != gl->gl_state) {
 		if (find_first_holder(gl))
-			goto out;
+			goto out_unlock;
 		if (nonblock)
 			goto out_sched;
 		set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
@@ -596,7 +651,10 @@ static void run_queue(struct gfs2_glock *gl, const int nonblock)
 	} else {
 		if (test_bit(GLF_DEMOTE, &gl->gl_flags))
 			gfs2_demote_wake(gl);
-		if (do_promote(gl) == 0)
+		ret = do_promote(gl);
+		if (ret == 0)
+			goto out_unlock;
+		if (ret == 2)
 			goto out;
 		gh = find_first_waiter(gl);
 		gl->gl_target = gh->gh_state;
@@ -604,23 +662,56 @@ static void run_queue(struct gfs2_glock *gl, const int nonblock)
 			do_error(gl, 0); /* Fail queued try locks */
 	}
 	do_xmote(gl, gh, gl->gl_target);
+out:
 	return;
 
 out_sched:
+	clear_bit(GLF_LOCK, &gl->gl_flags);
+	smp_mb__after_clear_bit();
 	gfs2_glock_hold(gl);
 	if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
-		gfs2_glock_put(gl);
-out:
+		gfs2_glock_put_nolock(gl);
+	return;
+
+out_unlock:
 	clear_bit(GLF_LOCK, &gl->gl_flags);
+	smp_mb__after_clear_bit();
+	return;
+}
+
+static void delete_work_func(struct work_struct *work)
+{
+	struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
+	struct gfs2_sbd *sdp = gl->gl_sbd;
+	struct gfs2_inode *ip = NULL;
+	struct inode *inode;
+	u64 no_addr = 0;
+
+	spin_lock(&gl->gl_spin);
+	ip = (struct gfs2_inode *)gl->gl_object;
+	if (ip)
+		no_addr = ip->i_no_addr;
+	spin_unlock(&gl->gl_spin);
+	if (ip) {
+		inode = gfs2_ilookup(sdp->sd_vfs, no_addr);
+		if (inode) {
+			d_prune_aliases(inode);
+			iput(inode);
+		}
+	}
+	gfs2_glock_put(gl);
 }
 
 static void glock_work_func(struct work_struct *work)
 {
 	unsigned long delay = 0;
 	struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work);
+	int drop_ref = 0;
 
-	if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags))
+	if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) {
 		finish_xmote(gl, gl->gl_reply);
+		drop_ref = 1;
+	}
 	spin_lock(&gl->gl_spin);
 	if (test_and_clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
 	    gl->gl_state != LM_ST_UNLOCKED &&
@@ -636,18 +727,8 @@ static void glock_work_func(struct work_struct *work)
 	if (!delay ||
 	    queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
 		gfs2_glock_put(gl);
-}
-
-static int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
-		     void **lockp)
-{
-	int error = -EIO;
-	if (!sdp->sd_lockstruct.ls_ops->lm_get_lock)
-		return 0;
-	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-		error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
-				sdp->sd_lockstruct.ls_lockspace, name, lockp);
-	return error;
+	if (drop_ref)
+		gfs2_glock_put(gl);
 }
 
 /**
@@ -667,24 +748,30 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 		   const struct gfs2_glock_operations *glops, int create,
 		   struct gfs2_glock **glp)
 {
+	struct super_block *s = sdp->sd_vfs;
 	struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type };
 	struct gfs2_glock *gl, *tmp;
 	unsigned int hash = gl_hash(sdp, &name);
-	int error;
+	struct address_space *mapping;
 
 	read_lock(gl_lock_addr(hash));
 	gl = search_bucket(hash, sdp, &name);
 	read_unlock(gl_lock_addr(hash));
 
-	if (gl || !create) {
-		*glp = gl;
+	*glp = gl;
+	if (gl)
 		return 0;
-	}
+	if (!create)
+		return -ENOENT;
 
-	gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL);
+	if (glops->go_flags & GLOF_ASPACE)
+		gl = kmem_cache_alloc(gfs2_glock_aspace_cachep, GFP_KERNEL);
+	else
+		gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL);
 	if (!gl)
 		return -ENOMEM;
 
+	atomic_inc(&sdp->sd_glock_disposal);
 	gl->gl_flags = 0;
 	gl->gl_name = name;
 	atomic_set(&gl->gl_ref, 1);
@@ -693,27 +780,26 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 	gl->gl_demote_state = LM_ST_EXCLUSIVE;
 	gl->gl_hash = hash;
 	gl->gl_ops = glops;
-	gl->gl_stamp = jiffies;
+	snprintf(gl->gl_strname, GDLM_STRNAME_BYTES, "%8x%16llx", name.ln_type, (unsigned long long)number);
+	memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
+	gl->gl_lksb.sb_lvbptr = gl->gl_lvb;
 	gl->gl_tchange = jiffies;
 	gl->gl_object = NULL;
 	gl->gl_sbd = sdp;
-	gl->gl_aspace = NULL;
 	INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
-
-	/* If this glock protects actual on-disk data or metadata blocks,
-	   create a VFS inode to manage the pages/buffers holding them. */
-	if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) {
-		gl->gl_aspace = gfs2_aspace_get(sdp);
-		if (!gl->gl_aspace) {
-			error = -ENOMEM;
-			goto fail;
-		}
+	INIT_WORK(&gl->gl_delete, delete_work_func);
+
+	mapping = gfs2_glock2aspace(gl);
+	if (mapping) {
+                mapping->a_ops = &gfs2_meta_aops;
+		mapping->host = s->s_bdev->bd_inode;
+		mapping->flags = 0;
+		mapping_set_gfp_mask(mapping, GFP_NOFS);
+		mapping->assoc_mapping = NULL;
+		mapping->backing_dev_info = s->s_bdi;
+		mapping->writeback_index = 0;
 	}
 
-	error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock);
-	if (error)
-		goto fail_aspace;
-
 	write_lock(gl_lock_addr(hash));
 	tmp = search_bucket(hash, sdp, &name);
 	if (tmp) {
@@ -728,13 +814,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 	*glp = gl;
 
 	return 0;
-
-fail_aspace:
-	if (gl->gl_aspace)
-		gfs2_aspace_put(gl->gl_aspace);
-fail:
-	kmem_cache_free(gfs2_glock_cachep, gl);
-	return error;
 }
 
 /**
@@ -792,22 +871,37 @@ void gfs2_holder_uninit(struct gfs2_holder *gh)
 	gh->gh_ip = 0;
 }
 
-static int just_schedule(void *word)
+/**
+ * gfs2_glock_holder_wait
+ * @word: unused
+ *
+ * This function and gfs2_glock_demote_wait both show up in the WCHAN
+ * field. Thus I've separated these otherwise identical functions in
+ * order to be more informative to the user.
+ */
+
+static int gfs2_glock_holder_wait(void *word)
 {
         schedule();
         return 0;
 }
 
+static int gfs2_glock_demote_wait(void *word)
+{
+	schedule();
+	return 0;
+}
+
 static void wait_on_holder(struct gfs2_holder *gh)
 {
 	might_sleep();
-	wait_on_bit(&gh->gh_iflags, HIF_WAIT, just_schedule, TASK_UNINTERRUPTIBLE);
+	wait_on_bit(&gh->gh_iflags, HIF_WAIT, gfs2_glock_holder_wait, TASK_UNINTERRUPTIBLE);
 }
 
 static void wait_on_demote(struct gfs2_glock *gl)
 {
 	might_sleep();
-	wait_on_bit(&gl->gl_flags, GLF_DEMOTE, just_schedule, TASK_UNINTERRUPTIBLE);
+	wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE);
 }
 
 /**
@@ -820,7 +914,7 @@ static void wait_on_demote(struct gfs2_glock *gl)
  */
 
 static void handle_callback(struct gfs2_glock *gl, unsigned int state,
-			    int remote, unsigned long delay)
+			    unsigned long delay)
 {
 	int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE;
 
@@ -828,13 +922,13 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state,
 	if (gl->gl_demote_state == LM_ST_EXCLUSIVE) {
 		gl->gl_demote_state = state;
 		gl->gl_demote_time = jiffies;
-		if (remote && gl->gl_ops->go_type == LM_TYPE_IOPEN &&
-		    gl->gl_object)
-			gfs2_glock_schedule_for_reclaim(gl);
 	} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
 			gl->gl_demote_state != state) {
 		gl->gl_demote_state = LM_ST_UNLOCKED;
 	}
+	if (gl->gl_ops->go_callback)
+		gl->gl_ops->go_callback(gl);
+	trace_gfs2_demote_rq(gl);
 }
 
 /**
@@ -877,6 +971,8 @@ void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...)
  */
 
 static inline void add_to_queue(struct gfs2_holder *gh)
+__releases(&gl->gl_spin)
+__acquires(&gl->gl_spin)
 {
 	struct gfs2_glock *gl = gh->gh_gl;
 	struct gfs2_sbd *sdp = gl->gl_sbd;
@@ -918,13 +1014,14 @@ fail:
 			goto do_cancel;
 		return;
 	}
+	trace_gfs2_glock_queue(gh, 1);
 	list_add_tail(&gh->gh_list, insert_pt);
 do_cancel:
 	gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
 	if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
 		spin_unlock(&gl->gl_spin);
 		if (sdp->sd_lockstruct.ls_ops->lm_cancel)
-			sdp->sd_lockstruct.ls_ops->lm_cancel(gl->gl_lock);
+			sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
 		spin_lock(&gl->gl_spin);
 	}
 	return;
@@ -998,7 +1095,7 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 
 	spin_lock(&gl->gl_spin);
 	if (gh->gh_flags & GL_NOCACHE)
-		handle_callback(gl, LM_ST_UNLOCKED, 0, 0);
+		handle_callback(gl, LM_ST_UNLOCKED, 0);
 
 	list_del_init(&gh->gh_list);
 	if (find_first_holder(gl) == NULL) {
@@ -1009,12 +1106,12 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 			spin_lock(&gl->gl_spin);
 			clear_bit(GLF_LOCK, &gl->gl_flags);
 		}
-		gl->gl_stamp = jiffies;
 		if (list_empty(&gl->gl_holders) &&
 		    !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
 		    !test_bit(GLF_DEMOTE, &gl->gl_flags))
 			fast_path = 1;
 	}
+	trace_gfs2_glock_queue(gh, 0);
 	spin_unlock(&gl->gl_spin);
 	if (likely(fast_path))
 		return;
@@ -1198,70 +1295,13 @@ void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs)
 		gfs2_glock_dq_uninit(&ghs[x]);
 }
 
-static int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, void *lock, char **lvbp)
-{
-	int error = -EIO;
-	if (!sdp->sd_lockstruct.ls_ops->lm_hold_lvb)
-		return 0;
-	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-		error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
-	return error;
-}
-
-/**
- * gfs2_lvb_hold - attach a LVB from a glock
- * @gl: The glock in question
- *
- */
-
-int gfs2_lvb_hold(struct gfs2_glock *gl)
-{
-	int error;
-
-	if (!atomic_read(&gl->gl_lvb_count)) {
-		error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb);
-		if (error) 
-			return error;
-		gfs2_glock_hold(gl);
-	}
-	atomic_inc(&gl->gl_lvb_count);
-
-	return 0;
-}
-
-/**
- * gfs2_lvb_unhold - detach a LVB from a glock
- * @gl: The glock in question
- *
- */
-
-void gfs2_lvb_unhold(struct gfs2_glock *gl)
+void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
 {
-	struct gfs2_sbd *sdp = gl->gl_sbd;
-
-	gfs2_glock_hold(gl);
-	gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0);
-	if (atomic_dec_and_test(&gl->gl_lvb_count)) {
-		if (sdp->sd_lockstruct.ls_ops->lm_unhold_lvb)
-			sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(gl->gl_lock, gl->gl_lvb);
-		gl->gl_lvb = NULL;
-		gfs2_glock_put(gl);
-	}
-	gfs2_glock_put(gl);
-}
-
-static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
-			unsigned int state)
-{
-	struct gfs2_glock *gl;
 	unsigned long delay = 0;
 	unsigned long holdtime;
 	unsigned long now = jiffies;
 
-	gl = gfs2_glock_find(sdp, name);
-	if (!gl)
-		return;
-
+	gfs2_glock_hold(gl);
 	holdtime = gl->gl_tchange + gl->gl_ops->go_min_hold_time;
 	if (time_before(now, holdtime))
 		delay = holdtime - now;
@@ -1269,149 +1309,94 @@ static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
 		delay = gl->gl_ops->go_min_hold_time;
 
 	spin_lock(&gl->gl_spin);
-	handle_callback(gl, state, 1, delay);
+	handle_callback(gl, state, delay);
 	spin_unlock(&gl->gl_spin);
 	if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
 		gfs2_glock_put(gl);
 }
 
 /**
- * gfs2_glock_cb - Callback used by locking module
- * @sdp: Pointer to the superblock
- * @type: Type of callback
- * @data: Type dependent data pointer
+ * gfs2_glock_complete - Callback used by locking
+ * @gl: Pointer to the glock
+ * @ret: The return value from the dlm
  *
- * Called by the locking module when it wants to tell us something.
- * Either we need to drop a lock, one of our ASYNC requests completed, or
- * a journal from another client needs to be recovered.
  */
 
-void gfs2_glock_cb(void *cb_data, unsigned int type, void *data)
+void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
 {
-	struct gfs2_sbd *sdp = cb_data;
-
-	switch (type) {
-	case LM_CB_NEED_E:
-		blocking_cb(sdp, data, LM_ST_UNLOCKED);
-		return;
-
-	case LM_CB_NEED_D:
-		blocking_cb(sdp, data, LM_ST_DEFERRED);
-		return;
-
-	case LM_CB_NEED_S:
-		blocking_cb(sdp, data, LM_ST_SHARED);
-		return;
-
-	case LM_CB_ASYNC: {
-		struct lm_async_cb *async = data;
-		struct gfs2_glock *gl;
-
-		down_read(&gfs2_umount_flush_sem);
-		gl = gfs2_glock_find(sdp, &async->lc_name);
-		if (gfs2_assert_warn(sdp, gl))
+	struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+	gl->gl_reply = ret;
+	if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))) {
+		struct gfs2_holder *gh;
+		spin_lock(&gl->gl_spin);
+		gh = find_first_waiter(gl);
+		if ((!(gh && (gh->gh_flags & LM_FLAG_NOEXP)) &&
+		     (gl->gl_target != LM_ST_UNLOCKED)) ||
+		    ((ret & ~LM_OUT_ST_MASK) != 0))
+			set_bit(GLF_FROZEN, &gl->gl_flags);
+		spin_unlock(&gl->gl_spin);
+		if (test_bit(GLF_FROZEN, &gl->gl_flags))
 			return;
-		gl->gl_reply = async->lc_ret;
-		set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
-		if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
-			gfs2_glock_put(gl);
-		up_read(&gfs2_umount_flush_sem);
-		return;
-	}
-
-	case LM_CB_NEED_RECOVERY:
-		gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data);
-		if (sdp->sd_recoverd_process)
-			wake_up_process(sdp->sd_recoverd_process);
-		return;
-
-	default:
-		gfs2_assert_warn(sdp, 0);
-		return;
 	}
+	set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
+	gfs2_glock_hold(gl);
+	if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
+		gfs2_glock_put(gl);
 }
 
-/**
- * demote_ok - Check to see if it's ok to unlock a glock
- * @gl: the glock
- *
- * Returns: 1 if it's ok
- */
-
-static int demote_ok(struct gfs2_glock *gl)
-{
-	const struct gfs2_glock_operations *glops = gl->gl_ops;
-	int demote = 1;
-
-	if (test_bit(GLF_STICKY, &gl->gl_flags))
-		demote = 0;
-	else if (glops->go_demote_ok)
-		demote = glops->go_demote_ok(gl);
-
-	return demote;
-}
-
-/**
- * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list
- * @gl: the glock
- *
- */
-
-void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl)
-{
-	struct gfs2_sbd *sdp = gl->gl_sbd;
-
-	spin_lock(&sdp->sd_reclaim_lock);
-	if (list_empty(&gl->gl_reclaim)) {
-		gfs2_glock_hold(gl);
-		list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list);
-		atomic_inc(&sdp->sd_reclaim_count);
-		spin_unlock(&sdp->sd_reclaim_lock);
-		wake_up(&sdp->sd_reclaim_wq);
-	} else
-		spin_unlock(&sdp->sd_reclaim_lock);
-}
-
-/**
- * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list
- * @sdp: the filesystem
- *
- * Called from gfs2_glockd() glock reclaim daemon, or when promoting a
- * different glock and we notice that there are a lot of glocks in the
- * reclaim list.
- *
- */
 
-void gfs2_reclaim_glock(struct gfs2_sbd *sdp)
+static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
 {
 	struct gfs2_glock *gl;
-	int done_callback = 0;
+	int may_demote;
+	int nr_skipped = 0;
+	LIST_HEAD(skipped);
 
-	spin_lock(&sdp->sd_reclaim_lock);
-	if (list_empty(&sdp->sd_reclaim_list)) {
-		spin_unlock(&sdp->sd_reclaim_lock);
-		return;
-	}
-	gl = list_entry(sdp->sd_reclaim_list.next,
-			struct gfs2_glock, gl_reclaim);
-	list_del_init(&gl->gl_reclaim);
-	spin_unlock(&sdp->sd_reclaim_lock);
+	if (nr == 0)
+		goto out;
 
-	atomic_dec(&sdp->sd_reclaim_count);
-	atomic_inc(&sdp->sd_reclaimed);
+	if (!(gfp_mask & __GFP_FS))
+		return -1;
 
-	spin_lock(&gl->gl_spin);
-	if (find_first_holder(gl) == NULL &&
-	    gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) {
-		handle_callback(gl, LM_ST_UNLOCKED, 0, 0);
-		done_callback = 1;
+	spin_lock(&lru_lock);
+	while(nr && !list_empty(&lru_list)) {
+		gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
+		list_del_init(&gl->gl_lru);
+		atomic_dec(&lru_count);
+
+		/* Test for being demotable */
+		if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
+			gfs2_glock_hold(gl);
+			spin_unlock(&lru_lock);
+			spin_lock(&gl->gl_spin);
+			may_demote = demote_ok(gl);
+			if (may_demote) {
+				handle_callback(gl, LM_ST_UNLOCKED, 0);
+				nr--;
+			}
+			clear_bit(GLF_LOCK, &gl->gl_flags);
+			smp_mb__after_clear_bit();
+			if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
+				gfs2_glock_put_nolock(gl);
+			spin_unlock(&gl->gl_spin);
+			spin_lock(&lru_lock);
+			continue;
+		}
+		nr_skipped++;
+		list_add(&gl->gl_lru, &skipped);
 	}
-	spin_unlock(&gl->gl_spin);
-	if (!done_callback ||
-	    queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
-		gfs2_glock_put(gl);
+	list_splice(&skipped, &lru_list);
+	atomic_add(nr_skipped, &lru_count);
+	spin_unlock(&lru_lock);
+out:
+	return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure;
 }
 
+static struct shrinker glock_shrinker = {
+	.shrink = gfs2_shrink_glock_memory,
+	.seeks = DEFAULT_SEEKS,
+};
+
 /**
  * examine_bucket - Call a function for glock in a hash bucket
  * @examiner: the function
@@ -1456,24 +1441,23 @@ out:
 	return has_entries;
 }
 
+
 /**
- * scan_glock - look at a glock and see if we can reclaim it
- * @gl: the glock to look at
+ * thaw_glock - thaw out a glock which has an unprocessed reply waiting
+ * @gl: The glock to thaw
  *
+ * N.B. When we freeze a glock, we leave a ref to the glock outstanding,
+ * so this has to result in the ref count being dropped by one.
  */
 
-static void scan_glock(struct gfs2_glock *gl)
+static void thaw_glock(struct gfs2_glock *gl)
 {
-	if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object)
-		return;
-	if (test_bit(GLF_LOCK, &gl->gl_flags))
+	if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
 		return;
-
-	spin_lock(&gl->gl_spin);
-	if (find_first_holder(gl) == NULL &&
-	    gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl))
-		gfs2_glock_schedule_for_reclaim(gl);
-	spin_unlock(&gl->gl_spin);
+	set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
+	gfs2_glock_hold(gl);
+	if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
+		gfs2_glock_put(gl);
 }
 
 /**
@@ -1484,23 +1468,16 @@ static void scan_glock(struct gfs2_glock *gl)
 
 static void clear_glock(struct gfs2_glock *gl)
 {
-	struct gfs2_sbd *sdp = gl->gl_sbd;
-	int released;
-
-	spin_lock(&sdp->sd_reclaim_lock);
-	if (!list_empty(&gl->gl_reclaim)) {
-		list_del_init(&gl->gl_reclaim);
-		atomic_dec(&sdp->sd_reclaim_count);
-		spin_unlock(&sdp->sd_reclaim_lock);
-		released = gfs2_glock_put(gl);
-		gfs2_assert(sdp, !released);
-	} else {
-		spin_unlock(&sdp->sd_reclaim_lock);
+	spin_lock(&lru_lock);
+	if (!list_empty(&gl->gl_lru)) {
+		list_del_init(&gl->gl_lru);
+		atomic_dec(&lru_count);
 	}
+	spin_unlock(&lru_lock);
 
 	spin_lock(&gl->gl_spin);
 	if (find_first_holder(gl) == NULL && gl->gl_state != LM_ST_UNLOCKED)
-		handle_callback(gl, LM_ST_UNLOCKED, 0, 0);
+		handle_callback(gl, LM_ST_UNLOCKED, 0);
 	spin_unlock(&gl->gl_spin);
 	gfs2_glock_hold(gl);
 	if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
@@ -1508,6 +1485,20 @@ static void clear_glock(struct gfs2_glock *gl)
 }
 
 /**
+ * gfs2_glock_thaw - Thaw any frozen glocks
+ * @sdp: The super block
+ *
+ */
+
+void gfs2_glock_thaw(struct gfs2_sbd *sdp)
+{
+	unsigned x;
+
+	for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
+		examine_bucket(thaw_glock, sdp, x);
+}
+
+/**
  * gfs2_gl_hash_clear - Empty out the glock hash table
  * @sdp: the filesystem
  * @wait: wait until it's all gone
@@ -1517,35 +1508,27 @@ static void clear_glock(struct gfs2_glock *gl)
 
 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp)
 {
-	unsigned long t;
 	unsigned int x;
-	int cont;
-
-	t = jiffies;
 
-	for (;;) {
-		cont = 0;
-		for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
-			if (examine_bucket(clear_glock, sdp, x))
-				cont = 1;
-		}
+	for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
+		examine_bucket(clear_glock, sdp, x);
+	flush_workqueue(glock_workqueue);
+	wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0);
+	gfs2_dump_lockstate(sdp);
+}
 
-		if (!cont)
-			break;
+void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
+{
+	struct gfs2_glock *gl = ip->i_gl;
+	int ret;
 
-		if (time_after_eq(jiffies,
-				  t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) {
-			fs_warn(sdp, "Unmount seems to be stalled. "
-				     "Dumping lock state...\n");
-			gfs2_dump_lockstate(sdp);
-			t = jiffies;
-		}
+	ret = gfs2_truncatei_resume(ip);
+	gfs2_assert_withdraw(gl->gl_sbd, ret == 0);
 
-		down_write(&gfs2_umount_flush_sem);
-		invalidate_inodes(sdp->sd_vfs);
-		up_write(&gfs2_umount_flush_sem);
-		msleep(10);
-	}
+	spin_lock(&gl->gl_spin);
+	clear_bit(GLF_LOCK, &gl->gl_flags);
+	run_queue(gl, 1);
+	spin_unlock(&gl->gl_spin);
 }
 
 static const char *state2str(unsigned state)
@@ -1573,7 +1556,7 @@ static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags)
 	if (flags & LM_FLAG_NOEXP)
 		*p++ = 'e';
 	if (flags & LM_FLAG_ANY)
-		*p++ = 'a';
+		*p++ = 'A';
 	if (flags & LM_FLAG_PRIORITY)
 		*p++ = 'p';
 	if (flags & GL_ASYNC)
@@ -1623,8 +1606,6 @@ static const char *gflags2str(char *buf, const unsigned long *gflags)
 	char *p = buf;
 	if (test_bit(GLF_LOCK, gflags))
 		*p++ = 'l';
-	if (test_bit(GLF_STICKY, gflags))
-		*p++ = 's';
 	if (test_bit(GLF_DEMOTE, gflags))
 		*p++ = 'D';
 	if (test_bit(GLF_PENDING_DEMOTE, gflags))
@@ -1639,6 +1620,10 @@ static const char *gflags2str(char *buf, const unsigned long *gflags)
 		*p++ = 'i';
 	if (test_bit(GLF_REPLY_PENDING, gflags))
 		*p++ = 'r';
+	if (test_bit(GLF_INITIAL, gflags))
+		*p++ = 'I';
+	if (test_bit(GLF_FROZEN, gflags))
+		*p++ = 'F';
 	*p = 0;
 	return buf;
 }
@@ -1673,14 +1658,13 @@ static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
 	dtime *= 1000000/HZ; /* demote time in uSec */
 	if (!test_bit(GLF_DEMOTE, &gl->gl_flags))
 		dtime = 0;
-	gfs2_print_dbg(seq, "G:  s:%s n:%u/%llu f:%s t:%s d:%s/%llu l:%d a:%d r:%d\n",
+	gfs2_print_dbg(seq, "G:  s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d r:%d\n",
 		  state2str(gl->gl_state),
 		  gl->gl_name.ln_type,
 		  (unsigned long long)gl->gl_name.ln_number,
 		  gflags2str(gflags_buf, &gl->gl_flags),
 		  state2str(gl->gl_target),
 		  state2str(gl->gl_demote_state), dtime,
-		  atomic_read(&gl->gl_lvb_count),
 		  atomic_read(&gl->gl_ail_count),
 		  atomic_read(&gl->gl_ref));
 
@@ -1743,34 +1727,6 @@ static int gfs2_dump_lockstate(struct gfs2_sbd *sdp)
 	return error;
 }
 
-/**
- * gfs2_scand - Look for cached glocks and inodes to toss from memory
- * @sdp: Pointer to GFS2 superblock
- *
- * One of these daemons runs, finding candidates to add to sd_reclaim_list.
- * See gfs2_glockd()
- */
-
-static int gfs2_scand(void *data)
-{
-	unsigned x;
-	unsigned delay;
-
-	while (!kthread_should_stop()) {
-		for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
-			examine_bucket(scan_glock, NULL, x);
-		if (freezing(current))
-			refrigerator();
-		delay = scand_secs;
-		if (delay < 1)
-			delay = 1;
-		schedule_timeout_interruptible(delay * HZ);
-	}
-
-	return 0;
-}
-
-
 
 int __init gfs2_glock_init(void)
 {
@@ -1784,28 +1740,27 @@ int __init gfs2_glock_init(void)
 	}
 #endif
 
-	scand_process = kthread_run(gfs2_scand, NULL, "gfs2_scand");
-	if (IS_ERR(scand_process))
-		return PTR_ERR(scand_process);
-
 	glock_workqueue = create_workqueue("glock_workqueue");
-	if (IS_ERR(glock_workqueue)) {
-		kthread_stop(scand_process);
+	if (IS_ERR(glock_workqueue))
 		return PTR_ERR(glock_workqueue);
+	gfs2_delete_workqueue = create_workqueue("delete_workqueue");
+	if (IS_ERR(gfs2_delete_workqueue)) {
+		destroy_workqueue(glock_workqueue);
+		return PTR_ERR(gfs2_delete_workqueue);
 	}
 
+	register_shrinker(&glock_shrinker);
+
 	return 0;
 }
 
 void gfs2_glock_exit(void)
 {
+	unregister_shrinker(&glock_shrinker);
 	destroy_workqueue(glock_workqueue);
-	kthread_stop(scand_process);
+	destroy_workqueue(gfs2_delete_workqueue);
 }
 
-module_param(scand_secs, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(scand_secs, "The number of seconds between scand runs");
-
 static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
 {
 	struct gfs2_glock *gl;