luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

md/raid10: split out interpretation of layout to separate function.

Browse Source 
We will soon be interpreting the layout (and chunksize etc) from
multiple places to support reshape.  So split it out into separate
function.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-05-21 09:28:33 +10:00
parent f8c9e74ff0
commit deb200d085
1 changed files with 49 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
drivers/md/raid10.c
View File

@ -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;
if (mddev->new_chunk_sectors < (PAGE_SIZE >> 9) ||
!is_power_of_2(mddev->new_chunk_sectors)) {
copies = setup_geo(&geo, mddev, geo_new);
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)