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ext4: prohibit fstrim in norecovery mode

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The ext4 fstrim implementation uses the block bitmaps to find free space
that can be discarded.  If we haven't replayed the journal, the bitmaps
will be stale and we absolutely *cannot* use stale metadata to zap the
underlying storage.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong 2019-03-23 12:10:29 -04:00 committed by Theodore Ts'o
parent 5e86bdda41
commit 18915b5873
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/ioctl.c
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@ -1000,6 +1000,13 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
/*
* We haven't replayed the journal, so we cannot use our
* block-bitmap-guided storage zapping commands.
*/
if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
return -EROFS;
if (copy_from_user(&range, (struct fstrim_range __user *)arg,
sizeof(range)))
return -EFAULT;