0001-md-FIX-raid5-should-accept-slot-set-by-mdadm

When reshape process is invoked in mdadm, new disks are added with set slot information.
raid5_start_reshape() should count devices with slot set as spares when slot is set outside array.
Those disks has to be added to array for reshape process also.

Changes allows to accept spares with slot set to raid5 configuration.

Signed-off-by: Adam Kwolek
---
drivers/md/raid5.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index dc574f3..fa2b085 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5528,8 +5528,9 @@ static int raid5_start_reshape(mddev_t *mddev)
return -ENOSPC;

list_for_each_entry(rdev, &mddev->disks, same_set)
- if (rdev->raid_disk < 0 &&
- !test_bit(Faulty, &rdev->flags))
+ if (((rdev->raid_disk < 0) ||
+ ((mddev->raid_disks -1 -mddev->degraded) < rdev->raid_disk)) &&
+ !test_bit(Faulty, &rdev->flags))
spares++;

if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded)
@@ -5574,8 +5575,9 @@ static int raid5_start_reshape(mddev_t *mddev)
*/
if (mddev->delta_disks >= 0)
list_for_each_entry(rdev, &mddev->disks, same_set)
- if (rdev->raid_disk < 0 &&
- !test_bit(Faulty, &rdev->flags)) {
+ if (((rdev->raid_disk < 0) ||
+ ((mddev->raid_disks -1 -mddev->degraded) < rdev->raid_disk)) &&
+ !test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev) == 0) {
char nm[20];
if (rdev->raid_disk >= conf->previous_raid_disks) {
--
1.6.0.2

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Re: 0001-md-FIX-raid5-should-accept-slot-set-by-mdadm

On Wed, 12 Jan 2011 14:49:22 +0000 "Kwolek, Adam"
wrote:

> When reshape process is invoked in mdadm, new disks are added with set slot information.
> raid5_start_reshape() should count devices with slot set as spares when slot is set outside array.
> Those disks has to be added to array for reshape process also.
>
> Changes allows to accept spares with slot set to raid5 configuration.
>
> Signed-off-by: Adam Kwolek
> ---
> drivers/md/raid5.c | 10 ++++++----
> 1 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index dc574f3..fa2b085 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -5528,8 +5528,9 @@ static int raid5_start_reshape(mddev_t *mddev)
> return -ENOSPC;
>
> list_for_each_entry(rdev, &mddev->disks, same_set)
> - if (rdev->raid_disk < 0 &&
> - !test_bit(Faulty, &rdev->flags))
> + if (((rdev->raid_disk < 0) ||
> + ((mddev->raid_disks -1 -mddev->degraded) < rdev->raid_disk)) &&
> + !test_bit(Faulty, &rdev->flags))
> spares++;
>
> if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded)
> @@ -5574,8 +5575,9 @@ static int raid5_start_reshape(mddev_t *mddev)
> */
> if (mddev->delta_disks >= 0)
> list_for_each_entry(rdev, &mddev->disks, same_set)
> - if (rdev->raid_disk < 0 &&
> - !test_bit(Faulty, &rdev->flags)) {
> + if (((rdev->raid_disk < 0) ||
> + ((mddev->raid_disks -1 -mddev->degraded) < rdev->raid_disk)) &&
> + !test_bit(Faulty, &rdev->flags)) {
> if (raid5_add_disk(mddev, rdev) == 0) {
> char nm[20];
> if (rdev->raid_disk >= conf->previous_raid_disks) {


I found the same issue and fixed it with this:

http://neil.brown.name/git?p=md;a=commitdiff;h=f50181a05893d 9bc7f2804c7e0fcb888feb34126


Thanks,
NeilBrown

From: NeilBrown
Date: Wed, 12 Jan 2011 04:41:55 +0000 (+1100)
Subject: md/raid5: handle manually-added spares in start_reshape.
X-Git-Url: http://neil.brown.name/git?p=md;a=commitdiff_plain;h=f50181a 05893d9bc7f2804c7e0fcb888feb34126

md/raid5: handle manually-added spares in start_reshape.

It is possible to manually add spares to specific slots before
starting a reshape.
raid5_start_reshape should recognised this possibility and include
it in the accounting.

Signed-off-by: NeilBrown
---

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d223a6c..5044bab 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5527,8 +5527,8 @@ static int raid5_start_reshape(mddev_t *mddev)
return -ENOSPC;

list_for_each_entry(rdev, &mddev->disks, same_set)
- if (rdev->raid_disk < 0 &&
- !test_bit(Faulty, &rdev->flags))
+ if ((rdev->raid_disk < 0 || rdev->raid_disk >= conf->raid_disks)
+ && !test_bit(Faulty, &rdev->flags))
spares++;

if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded)
@@ -5588,6 +5588,11 @@ static int raid5_start_reshape(mddev_t *mddev)
/* Failure here is OK */;
} else
break;
+ } else if (rdev->raid_disk >= conf->previous_raid_disks
+ && !test_bit(Faulty, &rdev->flags)) {
+ /* This is a spare that was manually added */
+ set_bit(In_sync, &rdev->flags);
+ added_devices++;
}

/* When a reshape changes the number of devices, ->degraded
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