Commit 8932c2e0 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[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: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c70810b3

drivers/md/raid10.c

+1 −1
Original line number Diff line number Diff line
@@ -2050,7 +2050,7 @@ static int run(mddev_t *mddev) 
	 * 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;

		if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)

			mddev->queue->backing_dev_info.ra_pages = 2* stripe;

drivers/md/raid5.c

+2 −2
Original line number Diff line number Diff line
@@ -2382,8 +2382,8 @@ static int run(mddev_t *mddev) 
	 * 2 * (n-1) * chunksize where 'n' is the number of raid devices

	 */

	{

		int stripe = (mddev->raid_disks-1) * mddev->chunk_size

			/ PAGE_SIZE;

		int stripe = (mddev->raid_disks-1) *

			(mddev->chunk_size / PAGE_SIZE);

		if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)

			mddev->queue->backing_dev_info.ra_pages = 2 * stripe;

	}

drivers/md/raid6main.c

+2 −2
Original line number Diff line number Diff line
@@ -2135,8 +2135,8 @@ static int run(mddev_t *mddev) 
	 * 2 * (n-2) * chunksize where 'n' is the number of raid devices

	 */

	{

		int stripe = (mddev->raid_disks-2) * mddev->chunk_size

			/ PAGE_SIZE;

		int stripe = (mddev->raid_disks-2) *

			(mddev->chunk_size / PAGE_SIZE);

		if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)

			mddev->queue->backing_dev_info.ra_pages = 2 * stripe;

	}

include/linux/raid/md_k.h

+2 −1
Original line number Diff line number Diff line
@@ -40,7 +40,8 @@ typedef struct mdk_rdev_s mdk_rdev_t; 
 * 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

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