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authorNeilBrown <neilb@suse.de>2008-10-13 11:55:12 +1100
committerNeilBrown <neilb@suse.de>2008-10-13 11:55:12 +1100
commit4bbf3771ca40d0aaec8316d0e7476b16010288e5 (patch)
treef7cba1f72612c5d2132f549881c46ff572e01933 /drivers/md/raid5.c
parentd710e13812600037a723a673dc5c96a071de98d3 (diff)
downloadop-kernel-dev-4bbf3771ca40d0aaec8316d0e7476b16010288e5.zip
op-kernel-dev-4bbf3771ca40d0aaec8316d0e7476b16010288e5.tar.gz
md: Relax minimum size restrictions on chunk_size.
Currently, the 'chunk_size' of an array must be at-least PAGE_SIZE. This makes moving an array to a machine with a larger PAGE_SIZE, or changing the kernel to use a larger PAGE_SIZE, can stop an array from working. For RAID10 and RAID4/5/6, this is non-trivial to fix as the resync process works on whole pages at a time, and assumes them to be wholly within a stripe. For other raid personalities, this restriction is not needed at all and can be dropped. So remove the test on chunk_size from common can, and add it in just the places where it is needed: raid10 and raid4/5/6. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r--drivers/md/raid5.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d72be4b..a36a743 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4007,6 +4007,13 @@ static int run(mddev_t *mddev)
return -EIO;
}
+ if (mddev->chunk_size < PAGE_SIZE) {
+ printk(KERN_ERR "md/raid5: chunk_size must be at least "
+ "PAGE_SIZE but %d < %ld\n",
+ mddev->chunk_size, PAGE_SIZE);
+ return -EINVAL;
+ }
+
if (mddev->reshape_position != MaxSector) {
/* Check that we can continue the reshape.
* Currently only disks can change, it must
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