[PATCH] mutex subsystem, semaphore to mutex: VFS, sb->s_lock

This patch converts the superblock-lock semaphore to a mutex, affecting
lock_super()/unlock_super(). Tested on ext3 and XFS.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index c3dbebdb9897..56bf76586019 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2150,7 +2150,7 @@ int ext3_force_commit(struct super_block *sb)
 
 static void ext3_write_super (struct super_block * sb)
 {
-        if (down_trylock(&sb->s_lock) == 0)
+        if (mutex_trylock(&sb->s_lock) != 0)
                 BUG();
         sb->s_dirt = 0;
 }
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 48bf7f0ce544..364d64bd5f10 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -169,7 +169,7 @@ static match_table_t tokens = {
  */
 static void ocfs2_write_super(struct super_block *sb)
 {
-        if (down_trylock(&sb->s_lock) == 0)
+        if (mutex_trylock(&sb->s_lock) != 0)
                 BUG();
         sb->s_dirt = 0;
 }
diff --git a/fs/super.c b/fs/super.c
index 0a30e51692cf..c177b92419c5 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -72,7 +72,7 @@ static struct super_block *alloc_super(void)
                 INIT_HLIST_HEAD(&s->s_anon);
                 INIT_LIST_HEAD(&s->s_inodes);
                 init_rwsem(&s->s_umount);
-                sema_init(&s->s_lock, 1);
+                mutex_init(&s->s_lock);
                 down_write(&s->s_umount);
                 s->s_count = S_BIAS;
                 atomic_set(&s->s_active, 1);