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authorSong Liu <songliubraving@fb.com>2015-10-09 04:54:13 (GMT)
committerNeilBrown <neilb@suse.com>2015-11-01 02:48:29 (GMT)
commit339421def582abb14c2217aa8c8f28bb2e299174 (patch)
treeffb4662582ae9357408d90d83a2e816923b055a3 /drivers/md/md.c
parentf2076e7d0643d15b11db979acc7cffd2e8d69e77 (diff)
downloadlinux-339421def582abb14c2217aa8c8f28bb2e299174.tar.xz
MD: when RAID journal is missing/faulty, block RESTART_ARRAY_RW
When RAID-4/5/6 array suffers from missing journal device, we put the array in read only state. We should not allow trasition to read-write states (clean and active) before replacing journal device. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b505759..08a4034 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3970,7 +3970,9 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
break;
case clean:
if (mddev->pers) {
- restart_array(mddev);
+ err = restart_array(mddev);
+ if (err)
+ break;
spin_lock(&mddev->lock);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
@@ -3988,7 +3990,9 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
break;
case active:
if (mddev->pers) {
- restart_array(mddev);
+ err = restart_array(mddev);
+ if (err)
+ break;
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
wake_up(&mddev->sb_wait);
err = 0;
@@ -5351,6 +5355,25 @@ 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();
+
+ /* Don't restart rw with journal missing/faulty */
+ if (!has_journal)
+ return -EINVAL;
+ }
+
mddev->safemode = 0;
mddev->ro = 0;
set_disk_ro(disk, 0);