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md: return -ENODEV if rdev has no mddev assigned

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Mdadm expects that setting drive as faulty will fail with -EBUSY only if
this operation will cause RAID to be failed. If this happens, it will
try to stop the array. Currently -EBUSY might also be returned if rdev
is in the middle of the removal process - for example there is a race
with mdmon that already requested the drive to be failed/removed.

If rdev does not contain mddev, return -ENODEV instead, so the caller
can distinguish between those two cases and behave accordingly.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Pawel Baldysiak 2019-03-27 13:48:21 +01:00 committed by Song Liu
parent 2c88e3c7ec
commit c42d324099
1 changed files with 2 additions and 2 deletions
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4
drivers/md/md.c
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@ -3380,10 +3380,10 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
rv = mddev ? mddev_lock(mddev): -EBUSY;
rv = mddev ? mddev_lock(mddev) : -ENODEV;
if (!rv) {
if (rdev->mddev == NULL)
rv = -EBUSY;
rv = -ENODEV;
else
rv = entry->store(rdev, page, length);
mddev_unlock(mddev);