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| author | Jan Blunck <jblunck@suse.de> | 2010-04-14 14:38:38 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2010-05-21 19:30:39 +0200 |
| commit | c15271f4e74cd6dbdf461335d6d1450949c4b956 (patch) | |
| tree | 585738bde9a80e580686072d02cd6c1e5d261c1e /fs/ext2/xattr.c | |
| parent | 4c96a68bfc110d87b28bcee4c395a7b4d26ed67a (diff) | |
| download | linux-c15271f4e74cd6dbdf461335d6d1450949c4b956.tar.gz linux-c15271f4e74cd6dbdf461335d6d1450949c4b956.tar.bz2 linux-c15271f4e74cd6dbdf461335d6d1450949c4b956.zip | |
ext2: Add ext2_sb_info s_lock spinlock
Add a spinlock that protects against concurrent modifications of
s_mount_state, s_blocks_last, s_overhead_last and the content of the
superblock's buffer pointed to by sbi->s_es. The spinlock is now used in
ext2_xattr_update_super_block() which was setting the
EXT2_FEATURE_COMPAT_EXT_ATTR flag on the superblock without protection
before. Likewise the spinlock is used in ext2_show_options() to have a
consistent view of the mount options.
This is a preparation patch for removing the BKL from ext2 in the next
patch.
Signed-off-by: Jan Blunck <jblunck@suse.de>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jan Kara <jack@suse.cz>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2/xattr.c')
| -rw-r--r-- | fs/ext2/xattr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c index e44dc92609be..3b96045a00ce 100644 --- a/fs/ext2/xattr.c +++ b/fs/ext2/xattr.c @@ -345,7 +345,9 @@ static void ext2_xattr_update_super_block(struct super_block *sb) if (EXT2_HAS_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR)) return; + spin_lock(&EXT2_SB(sb)->s_lock); EXT2_SET_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR); + spin_unlock(&EXT2_SB(sb)->s_lock); sb->s_dirt = 1; mark_buffer_dirty(EXT2_SB(sb)->s_sbh); } |