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authorNeilBrown <neilb@suse.de>2008-10-13 02:55:12 +0200
committerNeilBrown <neilb@suse.de>2008-10-13 02:55:12 +0200
commit4bbf3771ca40d0aaec8316d0e7476b16010288e5 (patch)
treef7cba1f72612c5d2132f549881c46ff572e01933 /drivers/md
parentmd: remove space after function name in declaration and call. (diff)
downloadlinux-4bbf3771ca40d0aaec8316d0e7476b16010288e5.tar.xz
linux-4bbf3771ca40d0aaec8316d0e7476b16010288e5.zip
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')
-rw-r--r--drivers/md/md.c7
-rw-r--r--drivers/md/raid10.c5
-rw-r--r--drivers/md/raid5.c7
3 files changed, 11 insertions, 8 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a29187d1fcf5..be2014f6e37b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3520,17 +3520,12 @@ static int do_md_run(mddev_t * mddev)
return -EINVAL;
}
/*
- * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+ * chunk-size has to be a power of 2
*/
if ( (1 << ffz(~chunk_size)) != chunk_size) {
printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
return -EINVAL;
}
- if (chunk_size < PAGE_SIZE) {
- printk(KERN_ERR "too small chunk_size: %d < %ld\n",
- chunk_size, PAGE_SIZE);
- return -EINVAL;
- }
/* devices must have minimum size of one chunk */
rdev_for_each(rdev, tmp, mddev) {
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8bdc9bfc2887..e3794799f308 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2028,8 +2028,9 @@ static int run(mddev_t *mddev)
int nc, fc, fo;
sector_t stride, size;
- if (mddev->chunk_size == 0) {
- printk(KERN_ERR "md/raid10: non-zero chunk size required.\n");
+ if (mddev->chunk_size < PAGE_SIZE) {
+ printk(KERN_ERR "md/raid10: chunk size must be "
+ "at least PAGE_SIZE(%ld).\n", PAGE_SIZE);
return -EINVAL;
}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d72be4b89e64..a36a7435edf5 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