[PATCH] md: assorted md and raid1 one-liners

Fix few bugs that meant that:
  - superblocks weren't alway written at exactly the right time (this
    could show up if the array was not written to - writting to the array
    causes lots of superblock updates and so hides these errors).

  - restarting device recovery after a clean shutdown (version-1 metadata
    only) didn't work as intended (or at all).

1/ Ensure superblock is updated when a new device is added.
2/ Remove an inappropriate test on MD_RECOVERY_SYNC in md_do_sync.
   The body of this if takes one of two branches depending on whether
   MD_RECOVERY_SYNC is set, so testing it in the clause of the if
   is wrong.
3/ Flag superblock for updating after a resync/recovery finishes.
4/ If we find the neeed to restart a recovery in the middle (version-1
   metadata only) make sure a full recovery (not just as guided by
   bitmaps) does get done.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 763ecab..21e2a7b 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3724,6 +3724,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
                if (err)
                        export_rdev(rdev);
 
+               md_update_sb(mddev, 1);
                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
                md_wakeup_thread(mddev->thread);
                return err;
@@ -5275,7 +5276,6 @@ void md_do_sync(mddev_t *mddev)
        mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
 
        if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
-           test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
            !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
            mddev->curr_resync > 2) {
                if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
@@ -5299,6 +5299,7 @@ void md_do_sync(mddev_t *mddev)
                                        rdev->recovery_offset = mddev->curr_resync;
                }
        }
+       set_bit(MD_CHANGE_DEVS, &mddev->flags);
 
  skip:
        mddev->curr_resync = 0;

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 656fae9..b3c5e12 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1951,6 +1951,7 @@ static int run(mddev_t *mddev)
                    !test_bit(In_sync, &disk->rdev->flags)) {
                        disk->head_position = 0;
                        mddev->degraded++;
+                       conf->fullsync = 1;
                }
        }
        if (mddev->degraded == conf->raid_disks) {