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md/raid5: If there is a spare and a want_replacement device, start replacement.

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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>
This commit is contained in:
NeilBrown 2011-12-23 10:17:53 +11:00
parent 17045f52ac
commit 7bfec5f35c
2 changed files with 28 additions and 18 deletions
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2
drivers/md/md.c
View file

@ -7399,7 +7399,6 @@ static int remove_and_add_spares(struct mddev *mddev)
} }
} }
if (mddev->degraded) {
list_for_each_entry(rdev, &mddev->disks, same_set) { list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk >= 0 && if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags) && !test_bit(In_sync, &rdev->flags) &&
@ -7418,7 +7417,6 @@ static int remove_and_add_spares(struct mddev *mddev)
} }
} }
} }
}
return spares; return spares;
} }

16
drivers/md/raid5.c
View file

@ -5376,8 +5376,9 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
disk = rdev->saved_raid_disk; disk = rdev->saved_raid_disk;
else else
disk = first; disk = first;
for ( ; disk <= last ; disk++) for ( ; disk <= last ; disk++) {
if ((p=conf->disks + disk)->rdev == NULL) { p = conf->disks + disk;
if (p->rdev == NULL) {
clear_bit(In_sync, &rdev->flags); clear_bit(In_sync, &rdev->flags);
rdev->raid_disk = disk; rdev->raid_disk = disk;
err = 0; err = 0;
@ -5386,6 +5387,17 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
rcu_assign_pointer(p->rdev, rdev); rcu_assign_pointer(p->rdev, rdev);
break; 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); print_raid5_conf(conf);
return err; return err;
} }