diff options
author | NeilBrown <neilb@suse.de> | 2007-02-28 20:11:48 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-01 14:53:36 -0800 |
commit | b4c4c7b8095298ff4ce20b40bf180ada070812d0 (patch) | |
tree | 2c51fe8ef220be17c791f8aca1218cadcae22b7f | |
parent | d1b5380c7f794da16e815c34e54ee7641db8a288 (diff) | |
download | op-kernel-dev-b4c4c7b8095298ff4ce20b40bf180ada070812d0.zip op-kernel-dev-b4c4c7b8095298ff4ce20b40bf180ada070812d0.tar.gz |
[PATCH] md: restart a (raid5) reshape that has been aborted due to a read/write error
An error always aborts any resync/recovery/reshape on the understanding that
it will immediately be restarted if that still makes sense. However a reshape
currently doesn't get restarted. With this patch it does.
To avoid restarting when it is not possible to do work, we call into the
personality to check that a reshape is ok, and strengthen raid5_check_reshape
to fail if there are too many failed devices.
We also break some code out into a separate function: remove_and_add_spares as
the indent level for that code was getting crazy.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | drivers/md/md.c | 74 | ||||
-rw-r--r-- | drivers/md/raid5.c | 2 |
2 files changed, 47 insertions, 29 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index b5744b1..6c06e82 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5357,6 +5357,44 @@ void md_do_sync(mddev_t *mddev) EXPORT_SYMBOL_GPL(md_do_sync); +static int remove_and_add_spares(mddev_t *mddev) +{ + mdk_rdev_t *rdev; + struct list_head *rtmp; + int spares = 0; + + ITERATE_RDEV(mddev,rdev,rtmp) + if (rdev->raid_disk >= 0 && + (test_bit(Faulty, &rdev->flags) || + ! test_bit(In_sync, &rdev->flags)) && + atomic_read(&rdev->nr_pending)==0) { + if (mddev->pers->hot_remove_disk( + mddev, rdev->raid_disk)==0) { + char nm[20]; + sprintf(nm,"rd%d", rdev->raid_disk); + sysfs_remove_link(&mddev->kobj, nm); + rdev->raid_disk = -1; + } + } + + if (mddev->degraded) { + ITERATE_RDEV(mddev,rdev,rtmp) + if (rdev->raid_disk < 0 + && !test_bit(Faulty, &rdev->flags)) { + rdev->recovery_offset = 0; + if (mddev->pers->hot_add_disk(mddev,rdev)) { + char nm[20]; + sprintf(nm, "rd%d", rdev->raid_disk); + sysfs_create_link(&mddev->kobj, + &rdev->kobj, nm); + spares++; + md_new_event(mddev); + } else + break; + } + } + return spares; +} /* * This routine is regularly called by all per-raid-array threads to * deal with generic issues like resync and super-block update. @@ -5411,7 +5449,7 @@ void md_check_recovery(mddev_t *mddev) return; if (mddev_trylock(mddev)) { - int spares =0; + int spares = 0; spin_lock_irq(&mddev->write_lock); if (mddev->safemode && !atomic_read(&mddev->writes_pending) && @@ -5474,35 +5512,13 @@ void md_check_recovery(mddev_t *mddev) * Spare are also removed and re-added, to allow * the personality to fail the re-add. */ - ITERATE_RDEV(mddev,rdev,rtmp) - if (rdev->raid_disk >= 0 && - (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && - atomic_read(&rdev->nr_pending)==0) { - if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { - char nm[20]; - sprintf(nm,"rd%d", rdev->raid_disk); - sysfs_remove_link(&mddev->kobj, nm); - rdev->raid_disk = -1; - } - } - - if (mddev->degraded) { - ITERATE_RDEV(mddev,rdev,rtmp) - if (rdev->raid_disk < 0 - && !test_bit(Faulty, &rdev->flags)) { - rdev->recovery_offset = 0; - if (mddev->pers->hot_add_disk(mddev,rdev)) { - char nm[20]; - sprintf(nm, "rd%d", rdev->raid_disk); - sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); - spares++; - md_new_event(mddev); - } else - break; - } - } - if (spares) { + if (mddev->reshape_position != MaxSector) { + if (mddev->pers->check_reshape(mddev) != 0) + /* Cannot proceed */ + goto unlock; + set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + } else if ((spares = remove_and_add_spares(mddev))) { clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); } else if (mddev->recovery_cp < MaxSector) { diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 11c3d7b..29fc06b 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3814,6 +3814,8 @@ static int raid5_check_reshape(mddev_t *mddev) if (err) return err; + if (mddev->degraded > conf->max_degraded) + return -EINVAL; /* looks like we might be able to manage this */ return 0; } |