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[PATCH] md: remove arbitrary limit on chunk size 

The largest chunk size the code can support without substantial surgery is
2^30 bytes, so make that the limit instead of an arbitrary 4Meg.  Some day,
the 'chunksize' should change to a sector-shift instead of a byte-count.  Then
no limit would be needed.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-06-26 00:27:36 -07:00 committed by Linus Torvalds
parent c70810b327
commit 8932c2e0dc
4 changed files with 7 additions and 6 deletions
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2
drivers/md/raid10.c
View File

@ -2050,7 +2050,7 @@ static int run(mddev_t *mddev)
* maybe... * maybe...
*/ */
{ {
int stripe = conf->raid_disks * mddev->chunk_size / PAGE_SIZE; int stripe = conf->raid_disks * (mddev->chunk_size / PAGE_SIZE);
stripe /= conf->near_copies; stripe /= conf->near_copies;
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe) if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
mddev->queue->backing_dev_info.ra_pages = 2* stripe; mddev->queue->backing_dev_info.ra_pages = 2* stripe;

4
drivers/md/raid5.c
View File

@ -2382,8 +2382,8 @@ static int run(mddev_t *mddev)
* 2 * (n-1) * chunksize where 'n' is the number of raid devices * 2 * (n-1) * chunksize where 'n' is the number of raid devices
*/ */
{ {
int stripe = (mddev->raid_disks-1) * mddev->chunk_size int stripe = (mddev->raid_disks-1) *
/ PAGE_SIZE; (mddev->chunk_size / PAGE_SIZE);
if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe; mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
} }

4
drivers/md/raid6main.c
View File

@ -2135,8 +2135,8 @@ static int run(mddev_t *mddev)
* 2 * (n-2) * chunksize where 'n' is the number of raid devices * 2 * (n-2) * chunksize where 'n' is the number of raid devices
*/ */
{ {
int stripe = (mddev->raid_disks-2) * mddev->chunk_size int stripe = (mddev->raid_disks-2) *
/ PAGE_SIZE; (mddev->chunk_size / PAGE_SIZE);
if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe; mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
} }

3
include/linux/raid/md_k.h
View File

@ -40,7 +40,8 @@ typedef struct mdk_rdev_s mdk_rdev_t;
* options passed in raidrun: * options passed in raidrun:
*/ */
#define MAX_CHUNK_SIZE (4096*1024) /* Currently this must fix in an 'int' */
#define MAX_CHUNK_SIZE (1<<30)
/* /*
* MD's 'extended' device * MD's 'extended' device