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md: raid0_make_request(): Replace chunksize_bits by chunksect_bits. 

As ffz(~(2 * x)) = ffz(~x) + 1, we have

	chunksect_bits = chunksize_bits + 1.

Fixup all users accordingly.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Andre Noll 2009-01-09 08:31:06 +11:00 committed by NeilBrown
parent 0c3573f19d
commit 1b7fdf8ff7
1 changed files with 5 additions and 5 deletions
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10
drivers/md/raid0.c
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@ -387,7 +387,7 @@ static int raid0_stop (mddev_t *mddev)
static int raid0_make_request (struct request_queue *q, struct bio *bio) static int raid0_make_request (struct request_queue *q, struct bio *bio)
{ {
mddev_t *mddev = q->queuedata; mddev_t *mddev = q->queuedata;
unsigned int sect_in_chunk, chunksize_bits, chunk_size, chunk_sects; unsigned int sect_in_chunk, chunksect_bits, chunk_size, chunk_sects;
raid0_conf_t *conf = mddev_to_conf(mddev); raid0_conf_t *conf = mddev_to_conf(mddev);
struct strip_zone *zone; struct strip_zone *zone;
mdk_rdev_t *tmp_dev; mdk_rdev_t *tmp_dev;
@ -409,7 +409,7 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
chunk_size = mddev->chunk_size >> 10; chunk_size = mddev->chunk_size >> 10;
chunk_sects = mddev->chunk_size >> 9; chunk_sects = mddev->chunk_size >> 9;
chunksize_bits = ffz(~chunk_size); chunksect_bits = ffz(~chunk_sects);
block = bio->bi_sector >> 1; block = bio->bi_sector >> 1;
@ -446,15 +446,15 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
{ {
sector_t x = (block - zone->zone_offset) >> chunksize_bits; sector_t x = (block - zone->zone_offset) >> (chunksect_bits - 1);
sector_div(x, zone->nb_dev); sector_div(x, zone->nb_dev);
chunk = x; chunk = x;
x = block >> chunksize_bits; x = block >> (chunksect_bits - 1);
tmp_dev = zone->dev[sector_div(x, zone->nb_dev)]; tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];
} }
rsect = (((chunk << chunksize_bits) + zone->dev_offset)<<1) rsect = (((chunk << (chunksect_bits - 1)) + zone->dev_offset)<<1)
+ sect_in_chunk; + sect_in_chunk;
bio->bi_bdev = tmp_dev->bdev; bio->bi_bdev = tmp_dev->bdev;