ext4: add EXT4_IOC_GOINGDOWN ioctl
This ioctl is modeled after the xfs's XFS_IOC_GOINGDOWN ioctl. (In
fact, it uses the same code points.)
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index cfa4ce5..3db5b64 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4821,7 +4821,7 @@ static int ext4_freeze(struct super_block *sb)
*/
static int ext4_unfreeze(struct super_block *sb)
{
- if (sb->s_flags & MS_RDONLY)
+ if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb)))
return 0;
if (EXT4_SB(sb)->s_journal) {