diff options
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 611ea7bbf47..8a5e14e4a85 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4913,6 +4913,47 @@ static void *raid5_takeover_raid1(mddev_t *mddev) } +static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk) +{ + /* Currently the layout and chunk size can only be changed + * for a 2-drive raid array, as in that case no data shuffling + * is required. + * Later we might validate these and set new_* so a reshape + * can complete the change. + */ + raid5_conf_t *conf = mddev_to_conf(mddev); + + if (new_layout >= 0 && !algorithm_valid_raid5(new_layout)) + return -EINVAL; + if (new_chunk > 0) { + if (new_chunk & (new_chunk-1)) + /* not a power of 2 */ + return -EINVAL; + if (new_chunk < PAGE_SIZE) + return -EINVAL; + if (mddev->array_sectors & ((new_chunk>>9)-1)) + /* not factor of array size */ + return -EINVAL; + } + + /* They look valid */ + + if (mddev->raid_disks != 2) + return -EINVAL; + + if (new_layout >= 0) { + conf->algorithm = new_layout; + mddev->layout = mddev->new_layout = new_layout; + } + if (new_chunk > 0) { + conf->chunk_size = new_chunk; + mddev->chunk_size = mddev->new_chunk = new_chunk; + } + set_bit(MD_CHANGE_DEVS, &mddev->flags); + md_wakeup_thread(mddev->thread); + return 0; +} + static void *raid5_takeover(mddev_t *mddev) { /* raid5 can take over: @@ -5023,6 +5064,7 @@ static struct mdk_personality raid5_personality = #endif .quiesce = raid5_quiesce, .takeover = raid5_takeover, + .reconfig = raid5_reconfig, }; static struct mdk_personality raid4_personality = |