From: NeilBrown <neilb@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 002 of 11] md: Remove arbitrary limit on chunk size.
Date: Mon, 1 May 2006 15:30:09 +1000 [thread overview]
Message-ID: <1060501053009.22925@suse.de> (raw)
In-Reply-To: 20060501152229.18367.patches@notabene
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>
### Diffstat output
./drivers/md/raid10.c | 2 +-
./drivers/md/raid5.c | 4 ++--
./drivers/md/raid6main.c | 4 ++--
./include/linux/raid/md_k.h | 3 ++-
4 files changed, 7 insertions(+), 6 deletions(-)
diff ./drivers/md/raid10.c~current~ ./drivers/md/raid10.c
--- ./drivers/md/raid10.c~current~ 2006-05-01 15:09:20.000000000 +1000
+++ ./drivers/md/raid10.c 2006-05-01 15:10:17.000000000 +1000
@@ -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;
diff ./drivers/md/raid5.c~current~ ./drivers/md/raid5.c
--- ./drivers/md/raid5.c~current~ 2006-05-01 15:09:20.000000000 +1000
+++ ./drivers/md/raid5.c 2006-05-01 15:10:17.000000000 +1000
@@ -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;
}
diff ./drivers/md/raid6main.c~current~ ./drivers/md/raid6main.c
--- ./drivers/md/raid6main.c~current~ 2006-05-01 15:09:20.000000000 +1000
+++ ./drivers/md/raid6main.c 2006-05-01 15:10:17.000000000 +1000
@@ -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;
}
diff ./include/linux/raid/md_k.h~current~ ./include/linux/raid/md_k.h
--- ./include/linux/raid/md_k.h~current~ 2006-05-01 15:09:20.000000000 +1000
+++ ./include/linux/raid/md_k.h 2006-05-01 15:10:17.000000000 +1000
@@ -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
next prev parent reply other threads:[~2006-05-01 5:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-01 5:29 [PATCH 000 of 11] md: Introduction - assort md enhancements for 2.6.18 NeilBrown
2006-05-01 5:29 ` NeilBrown
2006-05-01 5:30 ` [PATCH 001 of 11] md: Reformat code in raid1_end_write_request to avoid goto NeilBrown
2006-05-01 5:30 ` NeilBrown [this message]
2006-05-01 5:30 ` [PATCH 003 of 11] md: Remove useless ioctl warning NeilBrown
2006-05-01 5:30 ` [PATCH 004 of 11] md: Increase the delay before marking metadata clean, and make it configurable NeilBrown
2006-05-01 5:44 ` Andrew Morton
2006-05-01 6:02 ` Neil Brown
2006-05-01 6:13 ` Andrew Morton
2006-05-01 15:17 ` Linus Torvalds
2006-05-01 6:15 ` Nick Piggin
2006-05-02 5:56 ` bert hubert
2006-05-09 1:40 ` Neil Brown
2006-05-01 5:30 ` [PATCH 006 of 11] md: Remove nuisance message at shutdown NeilBrown
2006-05-01 5:30 ` [PATCH 007 of 11] md: Allow checkpoint of recovery with version-1 superblock NeilBrown
2006-05-01 5:30 ` [PATCH 008 of 11] md: Allow a linear array to have drives added while active NeilBrown
2006-05-01 5:30 ` [PATCH 009 of 11] md: Support stripe/offset mode in raid10 NeilBrown
2006-05-02 16:38 ` Al Boldi
2006-05-03 0:05 ` Neil Brown
2006-05-03 4:00 ` Al Boldi
2006-05-08 7:17 ` Neil Brown
2006-05-08 16:59 ` Al Boldi
2006-05-17 21:32 ` Raid5 resize "testing opportunity" Patrik Jonsson
2006-05-17 23:49 ` Neil Brown
2006-05-19 0:40 ` Patrik Jonsson
2006-05-19 0:44 ` Neil Brown
2006-05-19 20:11 ` Per Lindstrand
2006-05-01 5:31 ` [PATCH 010 of 11] md: make md_print_devices() static NeilBrown
2006-05-01 5:31 ` NeilBrown
2006-05-01 5:31 ` [PATCH 011 of 11] md: Split reshape portion of raid5 sync_request into a separate function NeilBrown
[not found] ` <1060501053025.22961@suse.de>
2006-05-01 5:40 ` [PATCH 005 of 11] md: Merge raid5 and raid6 code H. Peter Anvin
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