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 <[email protected]>
----
fs/ext3/super.c | 2 +-
fs/super.c | 2 +-
include/linux/fs.h | 6 +++---
3 files changed, 5 insertions(+), 5 deletions(-)
Index: linux/fs/ext3/super.c
===================================================================
--- linux.orig/fs/ext3/super.c
+++ linux/fs/ext3/super.c
@@ -2116,7 +2116,7 @@ int ext3_force_commit(struct super_block
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;
}
Index: linux/fs/super.c
===================================================================
--- linux.orig/fs/super.c
+++ linux/fs/super.c
@@ -72,7 +72,7 @@ static struct super_block *alloc_super(v
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);
Index: linux/include/linux/fs.h
===================================================================
--- linux.orig/include/linux/fs.h
+++ linux/include/linux/fs.h
@@ -791,7 +791,7 @@ 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;
@@ -863,13 +863,13 @@ 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);
}
/*
-
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