From 7bfec5f35c68121e7b1849f3f4166dd96c8da5b3 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Fri, 23 Dec 2011 10:17:53 +1100
Subject: [PATCH] md/raid5: If there is a spare and a want_replacement device,
start replacement.
When attempting to add a spare to a RAID[456] array, also consider
adding it as a replacement for a want_replacement device.
This requires that common md code attempt hot_add even when the array
is not formally degraded.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/md/md.c | 30 ++++++++++++++----------------
drivers/md/raid5.c | 16 ++++++++++++++--
2 files changed, 28 insertions(+), 18 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index be569eb41a93..1c1c562f63dc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7399,23 +7399,21 @@ static int remove_and_add_spares(struct mddev *mddev)
}
}
- if (mddev->degraded) {
- list_for_each_entry(rdev, &mddev->disks, same_set) {
- if (rdev->raid_disk >= 0 &&
- !test_bit(In_sync, &rdev->flags) &&
- !test_bit(Faulty, &rdev->flags))
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ if (rdev->raid_disk >= 0 &&
+ !test_bit(In_sync, &rdev->flags) &&
+ !test_bit(Faulty, &rdev->flags))
+ spares++;
+ if (rdev->raid_disk < 0
+ && !test_bit(Faulty, &rdev->flags)) {
+ rdev->recovery_offset = 0;
+ if (mddev->pers->
+ hot_add_disk(mddev, rdev) == 0) {
+ if (sysfs_link_rdev(mddev, rdev))
+ /* failure here is OK */;
spares++;
- if (rdev->raid_disk < 0
- && !test_bit(Faulty, &rdev->flags)) {
- rdev->recovery_offset = 0;
- if (mddev->pers->
- hot_add_disk(mddev, rdev) == 0) {
- if (sysfs_link_rdev(mddev, rdev))
- /* failure here is OK */;
- spares++;
- md_new_event(mddev);
- set_bit(MD_CHANGE_DEVS, &mddev->flags);
- }
+ md_new_event(mddev);
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
}
}
}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c80f8c2471cc..b2c83859f75b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5376,8 +5376,9 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
disk = rdev->saved_raid_disk;
else
disk = first;
- for ( ; disk <= last ; disk++)
- if ((p=conf->disks + disk)->rdev == NULL) {
+ for ( ; disk <= last ; disk++) {
+ p = conf->disks + disk;
+ if (p->rdev == NULL) {
clear_bit(In_sync, &rdev->flags);
rdev->raid_disk = disk;
err = 0;
@@ -5386,6 +5387,17 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
rcu_assign_pointer(p->rdev, rdev);
break;
}
+ if (test_bit(WantReplacement, &p->rdev->flags) &&
+ p->replacement == NULL) {
+ clear_bit(In_sync, &rdev->flags);
+ set_bit(Replacement, &rdev->flags);
+ rdev->raid_disk = disk;
+ err = 0;
+ conf->fullsync = 1;
+ rcu_assign_pointer(p->replacement, rdev);
+ break;
+ }
+ }
print_raid5_conf(conf);
return err;
}