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md/raid10: prioritize adding disk to 'removed' mirror

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When add a new disk to raid10, it will traverse conf->mirror from start
and find one of the following mirror to add:
  1. mirror->rdev is set to WantReplacement and it have no replacement,
     set new disk to mirror->replacement.
  2. no mirror->rdev, set new disk to mirror->rdev.

There is a array as below (sda is set to WantReplacement):

    Number   Major   Minor   RaidDevice State
       0       8        0        0      active sync set-A   /dev/sda
       -       0        0        1      removed
       2       8       32        2      active sync set-A   /dev/sdc
       3       8       48        3      active sync set-B   /dev/sdd

Use 'mdadm --add' to add a new disk to this array, the new disk will
become sda's replacement instead of add to removed position, which is
confusing for users. Meanwhile, after new disk recovery success, sda
will be set to Faulty.

Prioritize adding disk to 'removed' mirror is a better choice. In the
above scenario, the behavior is the same as before, except sda will not
be deleted. Before other disks are added, continued use sda is more
reliable.

Signed-off-by: Li Nan <linan122@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230527092007.3008856-1-linan666@huaweicloud.com
This commit is contained in:
Li Nan 2023-05-27 17:20:07 +08:00 committed by Song Liu
parent 59f8f0b54c
commit 6090368abc
1 changed files with 20 additions and 15 deletions
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35
drivers/md/raid10.c
View file

@ -2151,9 +2151,10 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
{
struct r10conf *conf = mddev->private;
int err = -EEXIST;
int mirror;
int mirror, repl_slot = -1;
int first = 0;
int last = conf->geo.raid_disks - 1;
struct raid10_info *p;
if (mddev->recovery_cp < MaxSector)
/* only hot-add to in-sync arrays, as recovery is
@ -2176,23 +2177,14 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
else
mirror = first;
for ( ; mirror <= last ; mirror++) {
struct raid10_info *p = &conf->mirrors[mirror];
p = &conf->mirrors[mirror];
if (p->recovery_disabled == mddev->recovery_disabled)
continue;
if (p->rdev) {
if (!test_bit(WantReplacement, &p->rdev->flags) ||
p->replacement != NULL)
continue;
clear_bit(In_sync, &rdev->flags);
set_bit(Replacement, &rdev->flags);
rdev->raid_disk = mirror;
err = 0;
if (mddev->gendisk)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
conf->fullsync = 1;
rcu_assign_pointer(p->replacement, rdev);
break;
if (test_bit(WantReplacement, &p->rdev->flags) &&
p->replacement == NULL && repl_slot < 0)
repl_slot = mirror;
continue;
}
if (mddev->gendisk)
@ -2209,6 +2201,19 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
if (err && repl_slot >= 0) {
p = &conf->mirrors[repl_slot];
clear_bit(In_sync, &rdev->flags);
set_bit(Replacement, &rdev->flags);
rdev->raid_disk = repl_slot;
err = 0;
if (mddev->gendisk)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
conf->fullsync = 1;
rcu_assign_pointer(p->replacement, rdev);
}
print_conf(conf);
return err;
}