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>

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index f98c390..85df87d 100644 (file)
--- 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;
 }