| [PATCH 2.6.19-rc3-mm1] VFS: BKL is not required for remount_fs() [message #7911] |
Mon, 30 October 2006 14:32 |
vaverin
Messages: 708
Registered: September 2005
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Senior Member |
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From: Vasily Averin <vvs@sw.ru>
according to Documentation/filesystems/Locking remount_fs() is not requires BKL
Signed-off-by: Vasily Averin <vvs@sw.ru>
--- linux-2.6.19-rc3-mm1/fs/namespace.c.blkrm 2006-10-30 14:36:09.000000000 +0300
+++ linux-2.6.19-rc3-mm1/fs/namespace.c 2006-10-30 14:33:05.000000000 +0300
@@ -594,10 +594,8 @@ static int do_umount(struct vfsmount *mn
*/
down_write(&sb->s_umount);
if (!(sb->s_flags & MS_RDONLY)) {
- lock_kernel();
DQUOT_OFF(sb);
retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);
- unlock_kernel();
}
up_write(&sb->s_umount);
return retval;
--- linux-2.6.19-rc3-mm1/fs/super.c.blkrm 2006-10-30 14:36:01.000000000 +0300
+++ linux-2.6.19-rc3-mm1/fs/super.c 2006-10-30 14:33:05.000000000 +0300
@@ -609,16 +609,8 @@ static void do_emergency_remount(unsigne
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
- if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) {
- /*
- * ->remount_fs needs lock_kernel().
- *
- * What lock protects sb->s_flags??
- */
- lock_kernel();
+ if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY))
do_remount_sb(sb, MS_RDONLY, NULL, 1);
- unlock_kernel();
- }
drop_super(sb);
spin_lock(&sb_lock);
}
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