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md: don't insist on valid event count for spare devices.

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Devices which know that they are spares do not really need to have
an event count that matches the rest of the array, so there are no
data-in-sync issues. It is enough that the uuid matches.
So remove the requirement that the event count is up-to-date.

We currently still write out and event count on spares, but this
allows us in a year or 3 to stop doing that completely.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-05-18 10:17:09 +10:00
parent a8707c08f4
commit be6800a73a
1 changed files with 13 additions and 6 deletions
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19
drivers/md/md.c
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@ -1070,10 +1070,13 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->bitmap_info.default_offset;
} else if (mddev->pers == NULL) {
/* Insist on good event counter while assembling */
/* Insist on good event counter while assembling, except
* for spares (which don't need an event count) */
++ev1;
if (ev1 < mddev->events)
return -EINVAL;
if (sb->disks[rdev->desc_nr].state & (
(1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* if adding to array with a bitmap, then we can accept an
* older device ... but not too old.
@ -1469,10 +1472,14 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
}
} else if (mddev->pers == NULL) {
/* Insist of good event counter while assembling */
/* Insist of good event counter while assembling, except for
* spares (which don't need an event count) */
++ev1;
if (ev1 < mddev->events)
return -EINVAL;
if (rdev->desc_nr >= 0 &&
rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* If adding to array with a bitmap, then we can accept an
* older device, but not too old.