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[PATCH] md: cause md/raid1 to "repack" working devices when number of drives is changed 

i.e.  missing or failed drives are moved to the end of the list.  The means
a 3 drive md array with the first drive missing can be shrunk to a two
drive array.  Currently that isn't possible.

Also, the "last_used" device number might be out-of-range after the number
of devices is reduced, so we set it to 0.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-21 17:17:09 -07:00 committed by Linus Torvalds
parent 58a606431a
commit 6ea9c07c6c
1 changed files with 19 additions and 5 deletions
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22
drivers/md/raid1.c
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@ -1349,17 +1349,26 @@ static int raid1_reshape(mddev_t *mddev, int raid_disks)
* We allocate a new r1bio_pool if we can.
* Then raise a device barrier and wait until all IO stops.
* Then resize conf->mirrors and swap in the new r1bio pool.
*
* At the same time, we "pack" the devices so that all the missing
* devices have the higher raid_disk numbers.
*/
mempool_t *newpool, *oldpool;
struct pool_info *newpoolinfo;
mirror_info_t *newmirrors;
conf_t *conf = mddev_to_conf(mddev);
int cnt;
int d;
int d, d2;
for (d= raid_disks; d < conf->raid_disks; d++)
if (raid_disks < conf->raid_disks) {
cnt=0;
for (d= 0; d < conf->raid_disks; d++)
if (conf->mirrors[d].rdev)
cnt++;
if (cnt > raid_disks)
return -EBUSY;
}
newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL);
if (!newpoolinfo)
@ -1390,8 +1399,12 @@ static int raid1_reshape(mddev_t *mddev, int raid_disks)
/* ok, everything is stopped */
oldpool = conf->r1bio_pool;
conf->r1bio_pool = newpool;
for (d=0; d < raid_disks && d < conf->raid_disks; d++)
newmirrors[d] = conf->mirrors[d];
for (d=d2=0; d < conf->raid_disks; d++)
if (conf->mirrors[d].rdev) {
conf->mirrors[d].rdev->raid_disk = d2;
newmirrors[d2++].rdev = conf->mirrors[d].rdev;
}
kfree(conf->mirrors);
conf->mirrors = newmirrors;
kfree(conf->poolinfo);
@ -1400,6 +1413,7 @@ static int raid1_reshape(mddev_t *mddev, int raid_disks)
mddev->degraded += (raid_disks - conf->raid_disks);
conf->raid_disks = mddev->raid_disks = raid_disks;
conf->last_used = 0; /* just make sure it is in-range */
spin_lock_irq(&conf->resync_lock);
conf->barrier--;
spin_unlock_irq(&conf->resync_lock);