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md: allow v0.91 metadata to record devices as being active but not in-sync. 

This is a combination that didn't really make sense before.
However when a reshape is converting e.g. raid5 -> raid6, the extra
device is not fully in-sync, but is certainly active and contains
important data.
So allow that start to be meaningful and in particular get
the 'recovery_offset' value (which is needed for any non-in-sync
active device) from the reshape_position.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-11-13 17:40:48 +11:00
parent 5e8651060c
commit 0261cd9f1c
1 changed files with 25 additions and 6 deletions
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31
drivers/md/md.c
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@ -944,6 +944,14 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
desc->raid_disk < mddev->raid_disks */) {
set_bit(In_sync, &rdev->flags);
rdev->raid_disk = desc->raid_disk;
} else if (desc->state & (1<<MD_DISK_ACTIVE)) {
/* active but not in sync implies recovery up to
* reshape position. We don't know exactly where
* that is, so set to zero for now */
if (mddev->minor_version >= 91) {
rdev->recovery_offset = 0;
rdev->raid_disk = desc->raid_disk;
}
}
if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
set_bit(WriteMostly, &rdev->flags);
@ -1032,8 +1040,19 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
list_for_each_entry(rdev2, &mddev->disks, same_set) {
mdp_disk_t *d;
int desc_nr;
if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
&& !test_bit(Faulty, &rdev2->flags))
int is_active = test_bit(In_sync, &rdev2->flags);
if (rdev2->raid_disk >= 0 &&
sb->minor_version >= 91)
/* we have nowhere to store the recovery_offset,
* but if it is not below the reshape_position,
* we can piggy-back on that.
*/
is_active = 1;
if (rdev2->raid_disk < 0 ||
test_bit(Faulty, &rdev2->flags))
is_active = 0;
if (is_active)
desc_nr = rdev2->raid_disk;
else
desc_nr = next_spare++;
@ -1043,16 +1062,16 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
d->number = rdev2->desc_nr;
d->major = MAJOR(rdev2->bdev->bd_dev);
d->minor = MINOR(rdev2->bdev->bd_dev);
if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
&& !test_bit(Faulty, &rdev2->flags))
if (is_active)
d->raid_disk = rdev2->raid_disk;
else
d->raid_disk = rdev2->desc_nr; /* compatibility */
if (test_bit(Faulty, &rdev2->flags))
d->state = (1<<MD_DISK_FAULTY);
else if (test_bit(In_sync, &rdev2->flags)) {
else if (is_active) {
d->state = (1<<MD_DISK_ACTIVE);
d->state |= (1<<MD_DISK_SYNC);
if (test_bit(In_sync, &rdev2->flags))
d->state |= (1<<MD_DISK_SYNC);
active++;
working++;
} else {