diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid10.c | 67 |
1 files changed, 49 insertions, 18 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 1c90005ab343..f102e88fc785 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3253,26 +3253,64 @@ static void calc_sectors(struct r10conf *conf, sector_t size) } } +enum geo_type {geo_new, geo_old, geo_start}; +static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new) +{ + int nc, fc, fo; + int layout, chunk, disks; + switch (new) { + case geo_old: + layout = mddev->layout; + chunk = mddev->chunk_sectors; + disks = mddev->raid_disks - mddev->delta_disks; + break; + case geo_new: + layout = mddev->new_layout; + chunk = mddev->new_chunk_sectors; + disks = mddev->raid_disks; + break; + default: /* avoid 'may be unused' warnings */ + case geo_start: /* new when starting reshape - raid_disks not + * updated yet. */ + layout = mddev->new_layout; + chunk = mddev->new_chunk_sectors; + disks = mddev->raid_disks + mddev->delta_disks; + break; + } + if (layout >> 17) + return -1; + if (chunk < (PAGE_SIZE >> 9) || + !is_power_of_2(chunk)) + return -2; + nc = layout & 255; + fc = (layout >> 8) & 255; + fo = layout & (1<<16); + geo->raid_disks = disks; + geo->near_copies = nc; + geo->far_copies = fc; + geo->far_offset = fo; + geo->chunk_mask = chunk - 1; + geo->chunk_shift = ffz(~chunk); + return nc*fc; +} + static struct r10conf *setup_conf(struct mddev *mddev) { struct r10conf *conf = NULL; - int nc, fc, fo; int err = -EINVAL; + struct geom geo; + int copies; + + copies = setup_geo(&geo, mddev, geo_new); - if (mddev->new_chunk_sectors < (PAGE_SIZE >> 9) || - !is_power_of_2(mddev->new_chunk_sectors)) { + if (copies == -2) { printk(KERN_ERR "md/raid10:%s: chunk size must be " "at least PAGE_SIZE(%ld) and be a power of 2.\n", mdname(mddev), PAGE_SIZE); goto out; } - nc = mddev->new_layout & 255; - fc = (mddev->new_layout >> 8) & 255; - fo = mddev->new_layout & (1<<16); - - if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks || - (mddev->new_layout >> 17)) { + if (copies < 2 || copies > mddev->raid_disks) { printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n", mdname(mddev), mddev->new_layout); goto out; @@ -3292,15 +3330,8 @@ static struct r10conf *setup_conf(struct mddev *mddev) if (!conf->tmppage) goto out; - - conf->geo.raid_disks = mddev->raid_disks; - conf->geo.near_copies = nc; - conf->geo.far_copies = fc; - conf->copies = nc*fc; - conf->geo.far_offset = fo; - conf->geo.chunk_mask = mddev->new_chunk_sectors - 1; - conf->geo.chunk_shift = ffz(~mddev->new_chunk_sectors); - + conf->geo = geo; + conf->copies = copies; conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc, r10bio_pool_free, conf); if (!conf->r10bio_pool) |
