Push BKL down into do_remount_sb()
[folded fix from Jiri Slaby]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/super.c b/fs/super.c
index 2a49fed..a64f362 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -542,25 +542,33 @@
shrink_dcache_sb(sb);
sync_filesystem(sb);
+ lock_kernel();
/* If we are remounting RDONLY and current sb is read/write,
make sure there are no rw files opened */
if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY)) {
if (force)
mark_files_ro(sb);
- else if (!fs_may_remount_ro(sb))
+ else if (!fs_may_remount_ro(sb)) {
+ unlock_kernel();
return -EBUSY;
+ }
retval = vfs_dq_off(sb, 1);
- if (retval < 0 && retval != -ENOSYS)
+ if (retval < 0 && retval != -ENOSYS) {
+ unlock_kernel();
return -EBUSY;
+ }
}
remount_rw = !(flags & MS_RDONLY) && (sb->s_flags & MS_RDONLY);
if (sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
- if (retval)
+ if (retval) {
+ unlock_kernel();
return retval;
+ }
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
+ unlock_kernel();
if (remount_rw)
vfs_dq_quota_on_remount(sb);
return 0;
@@ -581,9 +589,7 @@
*
* What lock protects sb->s_flags??
*/
- lock_kernel();
do_remount_sb(sb, MS_RDONLY, NULL, 1);
- unlock_kernel();
}
up_write(&sb->s_umount);
put_super(sb);