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| author | Jan Blunck <jblunck@infradead.org> | 2010-02-24 13:25:35 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-04 21:10:44 +0200 |
| commit | 3e44f9f1dc19e2b8d4f7ca3b3c63e976b22ad372 (patch) | |
| tree | 85e61adb1cb41d726cd8bb2300777c91676c1702 /fs/ext2/super.c | |
| parent | 6841c05021236b8d394cc6c41aa6ae17623aef13 (diff) | |
| download | lwn-3e44f9f1dc19e2b8d4f7ca3b3c63e976b22ad372.tar.gz lwn-3e44f9f1dc19e2b8d4f7ca3b3c63e976b22ad372.zip | |
BKL: Remove BKL from ext2 filesystem
The BKL is still used in ext2_put_super(), ext2_fill_super(), ext2_sync_fs()
ext2_remount() and ext2_write_inode(). From these calls ext2_put_super(),
ext2_fill_super() and ext2_remount() are protected against each other by
the struct super_block s_umount rw semaphore. The call in ext2_write_inode()
could only protect the modification of the ext2_sb_info through
ext2_update_dynamic_rev() against concurrent ext2_sync_fs() or ext2_remount().
ext2_fill_super() and ext2_put_super() can be left out because you need a
valid filesystem reference in all three cases, which you do not have when
you are one of these functions.
If the BKL is only protecting the modification of the ext2_sb_info it can
safely be removed since this is protected by the struct ext2_sb_info s_lock.
Signed-off-by: Jan Blunck <jblunck@infradead.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'fs/ext2/super.c')
| -rw-r--r-- | fs/ext2/super.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index f98c390caf1d..85df87d0f7b7 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -747,8 +747,6 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent) __le32 features; int err; - lock_kernel(); - err = -ENOMEM; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) @@ -1086,7 +1084,6 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent) if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) sb->s_flags |= MS_RDONLY; ext2_write_super(sb); - unlock_kernel(); return 0; cantfind_ext2: @@ -1112,7 +1109,6 @@ failed_sbi: kfree(sbi->s_blockgroup_lock); kfree(sbi); failed_unlock: - unlock_kernel(); return ret; } |