[PATCH 002 of 11] md: Remove arbitrary limit on chunk size.
From: NeilBrown <hidden>
Date: 2006-05-01 05:30:42
Also in:
lkml
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 <redacted> ### 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