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| author | Al Viro <viro@zeniv.linux.org.uk> | 2009-05-05 22:10:44 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-06-11 21:36:07 -0400 |
| commit | a9e220f8322e2b0e0b8903fe00265461cffad3f0 (patch) | |
| tree | b3be7d58b8eb9fd810636223f0458191ec1b9d75 | |
| parent | 62c6943b4b1e818aea60c11c5a68a50785b83119 (diff) | |
| download | linux-stable-a9e220f8322e2b0e0b8903fe00265461cffad3f0.tar.gz linux-stable-a9e220f8322e2b0e0b8903fe00265461cffad3f0.tar.bz2 linux-stable-a9e220f8322e2b0e0b8903fe00265461cffad3f0.zip | |
No need to do lock_super() for exclusion in generic_shutdown_super()
We can't run into contention on it. All other callers of lock_super()
either hold s_umount (and we have it exclusive) or hold an active
reference to superblock in question, which prevents the call of
generic_shutdown_super() while the reference is held. So we can
replace lock_super(s) with get_fs_excl() in generic_shutdown_super()
(and corresponding change for unlock_super(), of course).
Since ext4 expects s_lock held for its put_super, take lock_super()
into it. The rest of filesystems do not care at all.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/ext4/super.c | 2 | ||||
| -rw-r--r-- | fs/super.c | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c7b8f8d9b7a8..0d3034c5e8a4 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -576,6 +576,7 @@ static void ext4_put_super(struct super_block *sb) struct ext4_super_block *es = sbi->s_es; int i, err; + lock_super(sb); if (sb->s_dirt) ext4_write_super(sb); @@ -645,7 +646,6 @@ static void ext4_put_super(struct super_block *sb) unlock_super(sb); kobject_put(&sbi->s_kobj); wait_for_completion(&sbi->s_kobj_unregister); - lock_super(sb); lock_kernel(); kfree(sbi->s_blockgroup_lock); kfree(sbi); diff --git a/fs/super.c b/fs/super.c index 49f670cb9a83..54fd331f0cab 100644 --- a/fs/super.c +++ b/fs/super.c @@ -304,7 +304,7 @@ void generic_shutdown_super(struct super_block *sb) if (sb->s_root) { shrink_dcache_for_umount(sb); sync_filesystem(sb); - lock_super(sb); + get_fs_excl(); sb->s_flags &= ~MS_ACTIVE; /* bad name - it should be evict_inodes() */ @@ -322,7 +322,7 @@ void generic_shutdown_super(struct super_block *sb) } unlock_kernel(); - unlock_super(sb); + put_fs_excl(); } spin_lock(&sb_lock); /* should be initialized for __put_super_and_need_restart() */ |