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Commit 7892f2f4 authored by Ingo Molnar's avatar Ingo Molnar Committed by Ingo Molnar
Browse files

[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: default avatarIngo Molnar <mingo@elte.hu>
parent 1b1dcc1b

fs/ext3/super.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

}

fs/ocfs2/super.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

}

fs/super.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/fs.h

+3 −3
Original line number Diff line number Diff line
@@ -821,7 +821,7 @@ struct super_block { 
	unsigned long		s_magic;

	struct dentry		*s_root;

	struct rw_semaphore	s_umount;

	struct semaphore	s_lock;

	struct mutex		s_lock;

	int			s_count;

	int			s_syncing;

	int			s_need_sync_fs;
@@ -893,13 +893,13 @@ static inline int has_fs_excl(void) 
static inline void lock_super(struct super_block * sb)

{

	get_fs_excl();

	down(&sb->s_lock);

	mutex_lock(&sb->s_lock);

}



static inline void unlock_super(struct super_block * sb)

{

	put_fs_excl();

	up(&sb->s_lock);

	mutex_unlock(&sb->s_lock);

}



/*