X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Flockd%2Fsvclock.c;fp=fs%2Flockd%2Fsvclock.c;h=cf51f849e76c86732af645b5ab79ea12a002b021;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=9cfced65d4a2f5bba1525a3b9e20fb14f150414d;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 9cfced65d..cf51f849e 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -20,7 +20,6 @@
  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */
 
-#include <linux/config.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -39,15 +38,18 @@
 #define nlm_deadlock	nlm_lck_denied
 #endif
 
+static void nlmsvc_release_block(struct nlm_block *block);
 static void	nlmsvc_insert_block(struct nlm_block *block, unsigned long);
-static int	nlmsvc_remove_block(struct nlm_block *block);
+static void	nlmsvc_remove_block(struct nlm_block *block);
 
+static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock);
+static void nlmsvc_freegrantargs(struct nlm_rqst *call);
 static const struct rpc_call_ops nlmsvc_grant_ops;
 
 /*
  * The list of blocked locks to retry
  */
-static struct nlm_block *	nlm_blocked;
+static LIST_HEAD(nlm_blocked);
 
 /*
  * Insert a blocked lock into the global list
@@ -55,74 +57,68 @@ static struct nlm_block *	nlm_blocked;
 static void
 nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
 {
-	struct nlm_block **bp, *b;
+	struct nlm_block *b;
+	struct list_head *pos;
 
 	dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when);
-	if (block->b_queued)
-		nlmsvc_remove_block(block);
-	bp = &nlm_blocked;
+	if (list_empty(&block->b_list)) {
+		kref_get(&block->b_count);
+	} else {
+		list_del_init(&block->b_list);
+	}
+
+	pos = &nlm_blocked;
 	if (when != NLM_NEVER) {
 		if ((when += jiffies) == NLM_NEVER)
 			when ++;
-		while ((b = *bp) && time_before_eq(b->b_when,when) && b->b_when != NLM_NEVER)
-			bp = &b->b_next;
-	} else
-		while ((b = *bp) != 0)
-			bp = &b->b_next;
+		list_for_each(pos, &nlm_blocked) {
+			b = list_entry(pos, struct nlm_block, b_list);
+			if (time_after(b->b_when,when) || b->b_when == NLM_NEVER)
+				break;
+		}
+		/* On normal exit from the loop, pos == &nlm_blocked,
+		 * so we will be adding to the end of the list - good
+		 */
+	}
 
-	block->b_queued = 1;
+	list_add_tail(&block->b_list, pos);
 	block->b_when = when;
-	block->b_next = b;
-	*bp = block;
 }
 
 /*
  * Remove a block from the global list
  */
-static int
+static inline void
 nlmsvc_remove_block(struct nlm_block *block)
 {
-	struct nlm_block **bp, *b;
-
-	if (!block->b_queued)
-		return 1;
-	for (bp = &nlm_blocked; (b = *bp) != 0; bp = &b->b_next) {
-		if (b == block) {
-			*bp = block->b_next;
-			block->b_queued = 0;
-			return 1;
-		}
+	if (!list_empty(&block->b_list)) {
+		list_del_init(&block->b_list);
+		nlmsvc_release_block(block);
 	}
-
-	return 0;
 }
 
 /*
- * Find a block for a given lock and optionally remove it from
- * the list.
+ * Find a block for a given lock
  */
 static struct nlm_block *
-nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock, int remove)
+nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
 {
-	struct nlm_block	**head, *block;
+	struct nlm_block	*block;
 	struct file_lock	*fl;
 
 	dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n",
 				file, lock->fl.fl_pid,
 				(long long)lock->fl.fl_start,
 				(long long)lock->fl.fl_end, lock->fl.fl_type);
-	for (head = &nlm_blocked; (block = *head) != 0; head = &block->b_next) {
-		fl = &block->b_call.a_args.lock.fl;
+	list_for_each_entry(block, &nlm_blocked, b_list) {
+		fl = &block->b_call->a_args.lock.fl;
 		dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n",
 				block->b_file, fl->fl_pid,
 				(long long)fl->fl_start,
 				(long long)fl->fl_end, fl->fl_type,
-				nlmdbg_cookie2a(&block->b_call.a_args.cookie));
+				nlmdbg_cookie2a(&block->b_call->a_args.cookie));
 		if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) {
-			if (remove) {
-				*head = block->b_next;
-				block->b_queued = 0;
-			}
+			kref_get(&block->b_count);
 			return block;
 		}
 	}
@@ -143,18 +139,20 @@ static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b)
  * Find a block with a given NLM cookie.
  */
 static inline struct nlm_block *
-nlmsvc_find_block(struct nlm_cookie *cookie,  struct sockaddr_in *sin)
+nlmsvc_find_block(struct nlm_cookie *cookie)
 {
 	struct nlm_block *block;
 
-	for (block = nlm_blocked; block; block = block->b_next) {
-		dprintk("cookie: head of blocked queue %p, block %p\n", 
-			nlm_blocked, block);
-		if (nlm_cookie_match(&block->b_call.a_args.cookie,cookie)
-				&& nlm_cmp_addr(sin, &block->b_host->h_addr))
-			break;
+	list_for_each_entry(block, &nlm_blocked, b_list) {
+		if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie))
+			goto found;
 	}
 
+	return NULL;
+
+found:
+	dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block);
+	kref_get(&block->b_count);
 	return block;
 }
 
@@ -167,6 +165,11 @@ nlmsvc_find_block(struct nlm_cookie *cookie,  struct sockaddr_in *sin)
  * request, but (as I found out later) that's because some implementations
  * do just this. Never mind the standards comittees, they support our
  * logging industries.
+ *
+ * 10 years later: I hope we can safely ignore these old and broken
+ * clients by now. Let's fix this so we can uniquely identify an incoming
+ * GRANTED_RES message by cookie, without having to rely on the client's IP
+ * address. --okir
  */
 static inline struct nlm_block *
 nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
@@ -174,27 +177,32 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
 {
 	struct nlm_block	*block;
 	struct nlm_host		*host;
-	struct nlm_rqst		*call;
+	struct nlm_rqst		*call = NULL;
 
 	/* Create host handle for callback */
-	host = nlmclnt_lookup_host(&rqstp->rq_addr,
-				rqstp->rq_prot, rqstp->rq_vers);
+	host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
 	if (host == NULL)
 		return NULL;
 
+	call = nlm_alloc_call(host);
+	if (call == NULL)
+		return NULL;
+
 	/* Allocate memory for block, and initialize arguments */
-	if (!(block = (struct nlm_block *) kmalloc(sizeof(*block), GFP_KERNEL)))
+	block = kzalloc(sizeof(*block), GFP_KERNEL);
+	if (block == NULL)
 		goto failed;
-	memset(block, 0, sizeof(*block));
-	locks_init_lock(&block->b_call.a_args.lock.fl);
-	locks_init_lock(&block->b_call.a_res.lock.fl);
+	kref_init(&block->b_count);
+	INIT_LIST_HEAD(&block->b_list);
+	INIT_LIST_HEAD(&block->b_flist);
 
-	if (!nlmclnt_setgrantargs(&block->b_call, lock))
+	if (!nlmsvc_setgrantargs(call, lock))
 		goto failed_free;
 
 	/* Set notifier function for VFS, and init args */
-	block->b_call.a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
-	block->b_call.a_args.cookie = *cookie;	/* see above */
+	call->a_args.lock.fl.fl_flags |= FL_SLEEP;
+	call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
+	nlmclnt_next_cookie(&call->a_args.cookie);
 
 	dprintk("lockd: created block %p...\n", block);
 
@@ -202,22 +210,22 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
 	block->b_daemon = rqstp->rq_server;
 	block->b_host   = host;
 	block->b_file   = file;
+	file->f_count++;
 
 	/* Add to file's list of blocks */
-	block->b_fnext  = file->f_blocks;
-	file->f_blocks  = block;
+	list_add(&block->b_flist, &file->f_blocks);
 
 	/* Set up RPC arguments for callback */
-	call = &block->b_call;
-	call->a_host    = host;
+	block->b_call = call;
 	call->a_flags   = RPC_TASK_ASYNC;
+	call->a_block = block;
 
 	return block;
 
 failed_free:
 	kfree(block);
 failed:
-	nlm_release_host(host);
+	nlm_release_call(call);
 	return NULL;
 }
 
@@ -227,177 +235,206 @@ failed:
  * It is the caller's responsibility to check whether the file
  * can be closed hereafter.
  */
-static int
-nlmsvc_delete_block(struct nlm_block *block, int unlock)
+static int nlmsvc_unlink_block(struct nlm_block *block)
 {
-	struct file_lock	*fl = &block->b_call.a_args.lock.fl;
-	struct nlm_file		*file = block->b_file;
-	struct nlm_block	**bp;
-	int status = 0;
-
-	dprintk("lockd: deleting block %p...\n", block);
+	int status;
+	dprintk("lockd: unlinking block %p...\n", block);
 
 	/* Remove block from list */
+	status = posix_unblock_lock(block->b_file->f_file, &block->b_call->a_args.lock.fl);
 	nlmsvc_remove_block(block);
-	if (unlock)
-		status = posix_unblock_lock(file->f_file, fl);
+	return status;
+}
 
-	/* If the block is in the middle of a GRANT callback,
-	 * don't kill it yet. */
-	if (block->b_incall) {
-		nlmsvc_insert_block(block, NLM_NEVER);
-		block->b_done = 1;
-		return status;
-	}
+static void nlmsvc_free_block(struct kref *kref)
+{
+	struct nlm_block *block = container_of(kref, struct nlm_block, b_count);
+	struct nlm_file		*file = block->b_file;
+
+	dprintk("lockd: freeing block %p...\n", block);
 
 	/* Remove block from file's list of blocks */
-	for (bp = &file->f_blocks; *bp; bp = &(*bp)->b_fnext) {
-		if (*bp == block) {
-			*bp = block->b_fnext;
-			break;
-		}
-	}
+	mutex_lock(&file->f_mutex);
+	list_del_init(&block->b_flist);
+	mutex_unlock(&file->f_mutex);
 
-	if (block->b_host)
-		nlm_release_host(block->b_host);
-	nlmclnt_freegrantargs(&block->b_call);
+	nlmsvc_freegrantargs(block->b_call);
+	nlm_release_call(block->b_call);
+	nlm_release_file(block->b_file);
 	kfree(block);
-	return status;
+}
+
+static void nlmsvc_release_block(struct nlm_block *block)
+{
+	if (block != NULL)
+		kref_put(&block->b_count, nlmsvc_free_block);
 }
 
 /*
- * Loop over all blocks and perform the action specified.
- * (NLM_ACT_CHECK handled by nlmsvc_inspect_file).
+ * Loop over all blocks and delete blocks held by
+ * a matching host.
  */
-int
-nlmsvc_traverse_blocks(struct nlm_host *host, struct nlm_file *file, int action)
+void nlmsvc_traverse_blocks(struct nlm_host *host,
+			struct nlm_file *file,
+			nlm_host_match_fn_t match)
 {
-	struct nlm_block	*block, *next;
-	/* XXX: Will everything get cleaned up if we don't unlock here? */
-
-	down(&file->f_sema);
-	for (block = file->f_blocks; block; block = next) {
-		next = block->b_fnext;
-		if (action == NLM_ACT_MARK)
-			block->b_host->h_inuse = 1;
-		else if (action == NLM_ACT_UNLOCK) {
-			if (host == NULL || host == block->b_host)
-				nlmsvc_delete_block(block, 1);
-		}
+	struct nlm_block *block, *next;
+
+restart:
+	mutex_lock(&file->f_mutex);
+	list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) {
+		if (!match(block->b_host, host))
+			continue;
+		/* Do not destroy blocks that are not on
+		 * the global retry list - why? */
+		if (list_empty(&block->b_list))
+			continue;
+		kref_get(&block->b_count);
+		mutex_unlock(&file->f_mutex);
+		nlmsvc_unlink_block(block);
+		nlmsvc_release_block(block);
+		goto restart;
 	}
-	up(&file->f_sema);
-	return 0;
+	mutex_unlock(&file->f_mutex);
+}
+
+/*
+ * Initialize arguments for GRANTED call. The nlm_rqst structure
+ * has been cleared already.
+ */
+static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
+{
+	locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
+	memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
+	call->a_args.lock.caller = utsname()->nodename;
+	call->a_args.lock.oh.len = lock->oh.len;
+
+	/* set default data area */
+	call->a_args.lock.oh.data = call->a_owner;
+	call->a_args.lock.svid = lock->fl.fl_pid;
+
+	if (lock->oh.len > NLMCLNT_OHSIZE) {
+		void *data = kmalloc(lock->oh.len, GFP_KERNEL);
+		if (!data)
+			return 0;
+		call->a_args.lock.oh.data = (u8 *) data;
+	}
+
+	memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
+	return 1;
+}
+
+static void nlmsvc_freegrantargs(struct nlm_rqst *call)
+{
+	if (call->a_args.lock.oh.data != call->a_owner)
+		kfree(call->a_args.lock.oh.data);
 }
 
 /*
  * Attempt to establish a lock, and if it can't be granted, block it
  * if required.
  */
-u32
+__be32
 nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
 			struct nlm_lock *lock, int wait, struct nlm_cookie *cookie)
 {
-	struct file_lock	*conflock;
-	struct nlm_block	*block;
+	struct nlm_block	*block, *newblock = NULL;
 	int			error;
+	__be32			ret;
 
 	dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
-				file->f_file->f_dentry->d_inode->i_sb->s_id,
-				file->f_file->f_dentry->d_inode->i_ino,
+				file->f_file->f_path.dentry->d_inode->i_sb->s_id,
+				file->f_file->f_path.dentry->d_inode->i_ino,
 				lock->fl.fl_type, lock->fl.fl_pid,
 				(long long)lock->fl.fl_start,
 				(long long)lock->fl.fl_end,
 				wait);
 
 
-	/* Get existing block (in case client is busy-waiting) */
-	block = nlmsvc_lookup_block(file, lock, 0);
-
-	lock->fl.fl_flags |= FL_LOCKD;
-
+	lock->fl.fl_flags &= ~FL_SLEEP;
 again:
 	/* Lock file against concurrent access */
-	down(&file->f_sema);
+	mutex_lock(&file->f_mutex);
+	/* Get existing block (in case client is busy-waiting) */
+	block = nlmsvc_lookup_block(file, lock);
+	if (block == NULL) {
+		if (newblock != NULL)
+			lock = &newblock->b_call->a_args.lock;
+	} else
+		lock = &block->b_call->a_args.lock;
 
-	if (!(conflock = posix_test_lock(file->f_file, &lock->fl))) {
-		error = posix_lock_file(file->f_file, &lock->fl);
+	error = posix_lock_file(file->f_file, &lock->fl);
+	lock->fl.fl_flags &= ~FL_SLEEP;
 
-		if (block)
-			nlmsvc_delete_block(block, 0);
-		up(&file->f_sema);
+	dprintk("lockd: posix_lock_file returned %d\n", error);
 
-		dprintk("lockd: posix_lock_file returned %d\n", -error);
-		switch(-error) {
+	switch(error) {
 		case 0:
-			return nlm_granted;
-		case EDEADLK:
-			return nlm_deadlock;
-		case EAGAIN:
-			return nlm_lck_denied;
+			ret = nlm_granted;
+			goto out;
+		case -EAGAIN:
+			break;
+		case -EDEADLK:
+			ret = nlm_deadlock;
+			goto out;
 		default:			/* includes ENOLCK */
-			return nlm_lck_denied_nolocks;
-		}
+			ret = nlm_lck_denied_nolocks;
+			goto out;
 	}
 
-	if (!wait) {
-		up(&file->f_sema);
-		return nlm_lck_denied;
-	}
+	ret = nlm_lck_denied;
+	if (!wait)
+		goto out;
 
-	if (posix_locks_deadlock(&lock->fl, conflock)) {
-		up(&file->f_sema);
-		return nlm_deadlock;
-	}
+	ret = nlm_lck_blocked;
+	if (block != NULL)
+		goto out;
 
 	/* If we don't have a block, create and initialize it. Then
 	 * retry because we may have slept in kmalloc. */
-	/* We have to release f_sema as nlmsvc_create_block may try to
+	/* We have to release f_mutex as nlmsvc_create_block may try to
 	 * to claim it while doing host garbage collection */
-	if (block == NULL) {
-		up(&file->f_sema);
+	if (newblock == NULL) {
+		mutex_unlock(&file->f_mutex);
 		dprintk("lockd: blocking on this lock (allocating).\n");
-		if (!(block = nlmsvc_create_block(rqstp, file, lock, cookie)))
+		if (!(newblock = nlmsvc_create_block(rqstp, file, lock, cookie)))
 			return nlm_lck_denied_nolocks;
 		goto again;
 	}
 
 	/* Append to list of blocked */
-	nlmsvc_insert_block(block, NLM_NEVER);
-
-	if (list_empty(&block->b_call.a_args.lock.fl.fl_block)) {
-		/* Now add block to block list of the conflicting lock
-		   if we haven't done so. */
-		dprintk("lockd: blocking on this lock.\n");
-		posix_block_lock(conflock, &block->b_call.a_args.lock.fl);
-	}
-
-	up(&file->f_sema);
-	return nlm_lck_blocked;
+	nlmsvc_insert_block(newblock, NLM_NEVER);
+out:
+	mutex_unlock(&file->f_mutex);
+	nlmsvc_release_block(newblock);
+	nlmsvc_release_block(block);
+	dprintk("lockd: nlmsvc_lock returned %u\n", ret);
+	return ret;
 }
 
 /*
  * Test for presence of a conflicting lock.
  */
-u32
+__be32
 nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
 				       struct nlm_lock *conflock)
 {
-	struct file_lock	*fl;
-
 	dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
-				file->f_file->f_dentry->d_inode->i_sb->s_id,
-				file->f_file->f_dentry->d_inode->i_ino,
+				file->f_file->f_path.dentry->d_inode->i_sb->s_id,
+				file->f_file->f_path.dentry->d_inode->i_ino,
 				lock->fl.fl_type,
 				(long long)lock->fl.fl_start,
 				(long long)lock->fl.fl_end);
 
-	if ((fl = posix_test_lock(file->f_file, &lock->fl)) != NULL) {
+	if (posix_test_lock(file->f_file, &lock->fl, &conflock->fl)) {
 		dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
-				fl->fl_type, (long long)fl->fl_start,
-				(long long)fl->fl_end);
+				conflock->fl.fl_type,
+				(long long)conflock->fl.fl_start,
+				(long long)conflock->fl.fl_end);
 		conflock->caller = "somehost";	/* FIXME */
+		conflock->len = strlen(conflock->caller);
 		conflock->oh.len = 0;		/* don't return OH info */
-		conflock->fl = *fl;
+		conflock->svid = conflock->fl.fl_pid;
 		return nlm_lck_denied;
 	}
 
@@ -411,14 +448,14 @@ nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
  * afterwards. In this case the block will still be there, and hence
  * must be removed.
  */
-u32
+__be32
 nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
 {
 	int	error;
 
 	dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n",
-				file->f_file->f_dentry->d_inode->i_sb->s_id,
-				file->f_file->f_dentry->d_inode->i_ino,
+				file->f_file->f_path.dentry->d_inode->i_sb->s_id,
+				file->f_file->f_path.dentry->d_inode->i_ino,
 				lock->fl.fl_pid,
 				(long long)lock->fl.fl_start,
 				(long long)lock->fl.fl_end);
@@ -439,23 +476,26 @@ nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
  * be in progress.
  * The calling procedure must check whether the file can be closed.
  */
-u32
+__be32
 nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
 {
 	struct nlm_block	*block;
 	int status = 0;
 
 	dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n",
-				file->f_file->f_dentry->d_inode->i_sb->s_id,
-				file->f_file->f_dentry->d_inode->i_ino,
+				file->f_file->f_path.dentry->d_inode->i_sb->s_id,
+				file->f_file->f_path.dentry->d_inode->i_ino,
 				lock->fl.fl_pid,
 				(long long)lock->fl.fl_start,
 				(long long)lock->fl.fl_end);
 
-	down(&file->f_sema);
-	if ((block = nlmsvc_lookup_block(file, lock, 1)) != NULL)
-		status = nlmsvc_delete_block(block, 1);
-	up(&file->f_sema);
+	mutex_lock(&file->f_mutex);
+	block = nlmsvc_lookup_block(file, lock);
+	mutex_unlock(&file->f_mutex);
+	if (block != NULL) {
+		status = nlmsvc_unlink_block(block);
+		nlmsvc_release_block(block);
+	}
 	return status ? nlm_lck_denied : nlm_granted;
 }
 
@@ -469,11 +509,11 @@ nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
 static void
 nlmsvc_notify_blocked(struct file_lock *fl)
 {
-	struct nlm_block	**bp, *block;
+	struct nlm_block	*block;
 
 	dprintk("lockd: VFS unblock notification for block %p\n", fl);
-	for (bp = &nlm_blocked; (block = *bp) != 0; bp = &block->b_next) {
-		if (nlm_compare_locks(&block->b_call.a_args.lock.fl, fl)) {
+	list_for_each_entry(block, &nlm_blocked, b_list) {
+		if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
 			nlmsvc_insert_block(block, 0);
 			svc_wake_up(block->b_daemon);
 			return;
@@ -508,17 +548,13 @@ static void
 nlmsvc_grant_blocked(struct nlm_block *block)
 {
 	struct nlm_file		*file = block->b_file;
-	struct nlm_lock		*lock = &block->b_call.a_args.lock;
-	struct file_lock	*conflock;
+	struct nlm_lock		*lock = &block->b_call->a_args.lock;
 	int			error;
 
 	dprintk("lockd: grant blocked lock %p\n", block);
 
-	/* First thing is lock the file */
-	down(&file->f_sema);
-
 	/* Unlink block request from list */
-	nlmsvc_remove_block(block);
+	nlmsvc_unlink_block(block);
 
 	/* If b_granted is true this means we've been here before.
 	 * Just retry the grant callback, possibly refreshing the RPC
@@ -529,24 +565,21 @@ nlmsvc_grant_blocked(struct nlm_block *block)
 	}
 
 	/* Try the lock operation again */
-	if ((conflock = posix_test_lock(file->f_file, &lock->fl)) != NULL) {
-		/* Bummer, we blocked again */
+	lock->fl.fl_flags |= FL_SLEEP;
+	error = posix_lock_file(file->f_file, &lock->fl);
+	lock->fl.fl_flags &= ~FL_SLEEP;
+
+	switch (error) {
+	case 0:
+		break;
+	case -EAGAIN:
 		dprintk("lockd: lock still blocked\n");
 		nlmsvc_insert_block(block, NLM_NEVER);
-		posix_block_lock(conflock, &lock->fl);
-		up(&file->f_sema);
 		return;
-	}
-
-	/* Alright, no conflicting lock. Now lock it for real. If the
-	 * following yields an error, this is most probably due to low
-	 * memory. Retry the lock in a few seconds.
-	 */
-	if ((error = posix_lock_file(file->f_file, &lock->fl)) < 0) {
+	default:
 		printk(KERN_WARNING "lockd: unexpected error %d in %s!\n",
 				-error, __FUNCTION__);
 		nlmsvc_insert_block(block, 10 * HZ);
-		up(&file->f_sema);
 		return;
 	}
 
@@ -554,17 +587,13 @@ callback:
 	/* Lock was granted by VFS. */
 	dprintk("lockd: GRANTing blocked lock.\n");
 	block->b_granted = 1;
-	block->b_incall  = 1;
 
 	/* Schedule next grant callback in 30 seconds */
 	nlmsvc_insert_block(block, 30 * HZ);
 
 	/* Call the client */
-	nlm_get_host(block->b_call.a_host);
-	if (nlmsvc_async_call(&block->b_call, NLMPROC_GRANTED_MSG,
-						&nlmsvc_grant_ops) < 0)
-		nlm_release_host(block->b_call.a_host);
-	up(&file->f_sema);
+	kref_get(&block->b_count);
+	nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG, &nlmsvc_grant_ops);
 }
 
 /*
@@ -578,20 +607,10 @@ callback:
 static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
 {
 	struct nlm_rqst		*call = data;
-	struct nlm_block	*block;
+	struct nlm_block	*block = call->a_block;
 	unsigned long		timeout;
-	struct sockaddr_in	*peer_addr = RPC_PEERADDR(task->tk_client);
 
 	dprintk("lockd: GRANT_MSG RPC callback\n");
-	dprintk("callback: looking for cookie %s, host (%u.%u.%u.%u)\n",
-		nlmdbg_cookie2a(&call->a_args.cookie),
-		NIPQUAD(peer_addr->sin_addr.s_addr));
-	if (!(block = nlmsvc_find_block(&call->a_args.cookie, peer_addr))) {
-		dprintk("lockd: no block for cookie %s, host (%u.%u.%u.%u)\n",
-			nlmdbg_cookie2a(&call->a_args.cookie),
-			NIPQUAD(peer_addr->sin_addr.s_addr));
-		return;
-	}
 
 	/* Technically, we should down the file semaphore here. Since we
 	 * move the block towards the head of the queue only, no harm
@@ -599,22 +618,24 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
 	if (task->tk_status < 0) {
 		/* RPC error: Re-insert for retransmission */
 		timeout = 10 * HZ;
-	} else if (block->b_done) {
-		/* Block already removed, kill it for real */
-		timeout = 0;
 	} else {
 		/* Call was successful, now wait for client callback */
 		timeout = 60 * HZ;
 	}
 	nlmsvc_insert_block(block, timeout);
 	svc_wake_up(block->b_daemon);
-	block->b_incall = 0;
+}
 
-	nlm_release_host(call->a_host);
+static void nlmsvc_grant_release(void *data)
+{
+	struct nlm_rqst		*call = data;
+
+	nlmsvc_release_block(call->a_block);
 }
 
 static const struct rpc_call_ops nlmsvc_grant_ops = {
 	.rpc_call_done = nlmsvc_grant_callback,
+	.rpc_release = nlmsvc_grant_release,
 };
 
 /*
@@ -622,37 +643,26 @@ static const struct rpc_call_ops nlmsvc_grant_ops = {
  * block.
  */
 void
-nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status)
+nlmsvc_grant_reply(struct nlm_cookie *cookie, __be32 status)
 {
 	struct nlm_block	*block;
-	struct nlm_file		*file;
 
-	dprintk("grant_reply: looking for cookie %x, host (%08x), s=%d \n", 
-		*(unsigned int *)(cookie->data), 
-		ntohl(rqstp->rq_addr.sin_addr.s_addr), status);
-	if (!(block = nlmsvc_find_block(cookie, &rqstp->rq_addr)))
+	dprintk("grant_reply: looking for cookie %x, s=%d \n",
+		*(unsigned int *)(cookie->data), status);
+	if (!(block = nlmsvc_find_block(cookie)))
 		return;
-	file = block->b_file;
 
-	file->f_count++;
-	down(&file->f_sema);
-	block = nlmsvc_find_block(cookie, &rqstp->rq_addr);
 	if (block) {
-		if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
+		if (status == nlm_lck_denied_grace_period) {
 			/* Try again in a couple of seconds */
 			nlmsvc_insert_block(block, 10 * HZ);
-			up(&file->f_sema);
 		} else {
 			/* Lock is now held by client, or has been rejected.
 			 * In both cases, the block should be removed. */
-			up(&file->f_sema);
-			if (status == NLM_LCK_GRANTED)
-				nlmsvc_delete_block(block, 0);
-			else
-				nlmsvc_delete_block(block, 1);
+			nlmsvc_unlink_block(block);
 		}
 	}
-	nlm_release_file(file);
+	nlmsvc_release_block(block);
 }
 
 /*
@@ -663,26 +673,25 @@ nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status
 unsigned long
 nlmsvc_retry_blocked(void)
 {
-	struct nlm_block	*block;
+	unsigned long	timeout = MAX_SCHEDULE_TIMEOUT;
+	struct nlm_block *block;
+
+	while (!list_empty(&nlm_blocked)) {
+		block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
 
-	dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
-			nlm_blocked,
-			nlm_blocked? nlm_blocked->b_when : 0);
-	while ((block = nlm_blocked) != 0) {
 		if (block->b_when == NLM_NEVER)
 			break;
-	        if (time_after(block->b_when,jiffies))
+	        if (time_after(block->b_when,jiffies)) {
+			timeout = block->b_when - jiffies;
 			break;
-		dprintk("nlmsvc_retry_blocked(%p, when=%ld, done=%d)\n",
-			block, block->b_when, block->b_done);
-		if (block->b_done)
-			nlmsvc_delete_block(block, 0);
-		else
-			nlmsvc_grant_blocked(block);
-	}
+		}
 
-	if ((block = nlm_blocked) && block->b_when != NLM_NEVER)
-		return (block->b_when - jiffies);
+		dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
+			block, block->b_when);
+		kref_get(&block->b_count);
+		nlmsvc_grant_blocked(block);
+		nlmsvc_release_block(block);
+	}
 
-	return MAX_SCHEDULE_TIMEOUT;
+	return timeout;
 }