diff options
| -rw-r--r-- | drivers/md/raid10.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index e4a66ab6b0fb..3540316886f2 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3436,6 +3436,43 @@ static void raid10_quiesce(struct mddev *mddev, int state) } } +static int raid10_resize(struct mddev *mddev, sector_t sectors) +{ + /* Resize of 'far' arrays is not supported. + * For 'near' and 'offset' arrays we can set the + * number of sectors used to be an appropriate multiple + * of the chunk size. + * For 'offset', this is far_copies*chunksize. + * For 'near' the multiplier is the LCM of + * near_copies and raid_disks. + * So if far_copies > 1 && !far_offset, fail. + * Else find LCM(raid_disks, near_copy)*far_copies and + * multiply by chunk_size. Then round to this number. + * This is mostly done by raid10_size() + */ + struct r10conf *conf = mddev->private; + sector_t oldsize, size; + + if (conf->far_copies > 1 && !conf->far_offset) + return -EINVAL; + + oldsize = raid10_size(mddev, 0, 0); + size = raid10_size(mddev, sectors, 0); + md_set_array_sectors(mddev, size); + if (mddev->array_sectors > size) + return -EINVAL; + set_capacity(mddev->gendisk, mddev->array_sectors); + revalidate_disk(mddev->gendisk); + if (sectors > mddev->dev_sectors && + mddev->recovery_cp > oldsize) { + mddev->recovery_cp = oldsize; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + } + mddev->dev_sectors = sectors; + mddev->resync_max_sectors = size; + return 0; +} + static void *raid10_takeover_raid0(struct mddev *mddev) { struct md_rdev *rdev; @@ -3505,6 +3542,7 @@ static struct md_personality raid10_personality = .sync_request = sync_request, .quiesce = raid10_quiesce, .size = raid10_size, + .resize = raid10_resize, .takeover = raid10_takeover, }; |