raid5: journal disk can't be removed

raid5-cache uses journal disk rdev->bdev, rdev->mddev in several places.
Don't allow journal disk disappear magically. On the other hand, we do
need to update superblock for other disks to bump up ->events, so next
time journal disk will be identified as stale.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 216fa3c..693c000 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7128,6 +7128,15 @@ static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
        struct disk_info *p = conf->disks + number;
 
        print_raid5_conf(conf);
+       if (test_bit(Journal, &rdev->flags)) {
+               /*
+                * journal disk is not removable, but we need give a chance to
+                * update superblock of other disks. Otherwise journal disk
+                * will be considered as 'fresh'
+                */
+               set_bit(MD_CHANGE_DEVS, &mddev->flags);
+               return -EINVAL;
+       }
        if (rdev == p->rdev)
                rdevp = &p->rdev;
        else if (rdev == p->replacement)
@@ -7190,6 +7199,8 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
        int first = 0;
        int last = conf->raid_disks - 1;
 
+       if (test_bit(Journal, &rdev->flags))
+               return -EINVAL;
        if (mddev->recovery_disabled == conf->recovery_disabled)
                return -EBUSY;