diff options
| author | NeilBrown <neilb@suse.com> | 2017-04-13 01:53:48 +0300 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-04-20 23:25:51 +0300 |
| commit | 97b20ef784388753becb41b27876a048e905fe9b (patch) | |
| tree | 2f7128cc65e3cbbcf6b78f0bd0d97919ad6de6a7 /drivers/md/md.c | |
| parent | cf25ae78fc50010f66b9be945017796da34c434d (diff) | |
| download | linux-97b20ef784388753becb41b27876a048e905fe9b.tar.xz | |
md: handle read-only member devices better.
1/ If an array has any read-only devices when it is started,
the array itself must be read-only
2/ A read-only device cannot be added to an array after it is
started.
3/ Setting an array to read-write should not succeed
if any member devices are read-only
Reported-and-Tested-by: Nanda Kishore Chinnaram <Nanda_Kishore_Chinna@dell.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 6cc6dd74c153..82f798be964f 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2103,6 +2103,10 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) if (find_rdev(mddev, rdev->bdev->bd_dev)) return -EEXIST; + if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) && + mddev->pers) + return -EROFS; + /* make sure rdev->sectors exceeds mddev->dev_sectors */ if (!test_bit(Journal, &rdev->flags) && rdev->sectors && @@ -5382,6 +5386,13 @@ int md_run(struct mddev *mddev) continue; sync_blockdev(rdev->bdev); invalidate_bdev(rdev->bdev); + if (mddev->ro != 1 && + (bdev_read_only(rdev->bdev) || + bdev_read_only(rdev->meta_bdev))) { + mddev->ro = 1; + if (mddev->gendisk) + set_disk_ro(mddev->gendisk, 1); + } /* perform some consistency tests on the device. * We don't want the data to overlap the metadata, @@ -5606,6 +5617,9 @@ out: static int restart_array(struct mddev *mddev) { struct gendisk *disk = mddev->gendisk; + struct md_rdev *rdev; + bool has_journal = false; + bool has_readonly = false; /* Complain if it has no devices */ if (list_empty(&mddev->disks)) @@ -5614,24 +5628,21 @@ static int restart_array(struct mddev *mddev) return -EINVAL; if (!mddev->ro) return -EBUSY; - if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { - struct md_rdev *rdev; - bool has_journal = false; - - rcu_read_lock(); - rdev_for_each_rcu(rdev, mddev) { - if (test_bit(Journal, &rdev->flags) && - !test_bit(Faulty, &rdev->flags)) { - has_journal = true; - break; - } - } - rcu_read_unlock(); + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + if (test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags)) + has_journal = true; + if (bdev_read_only(rdev->bdev)) + has_readonly = true; + } + rcu_read_unlock(); + if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) /* Don't restart rw with journal missing/faulty */ - if (!has_journal) return -EINVAL; - } + if (has_readonly) + return -EROFS; mddev->safemode = 0; mddev->ro = 0; |