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authorDan Williams <dan.j.williams@intel.com>2009-03-31 15:00:31 +1100
committerDan Williams <dan.j.williams@intel.com>2009-03-31 15:00:31 +1100
commitb522adcde9c4d3fb7b579cfa9160d8bde7744be8 (patch)
tree4208e3dcec3ebdfa6ad9bc153f76129400532717 /drivers/md/raid0.c
parent1f403624bde3c678a166984b1e6a727a0ce06f2b (diff)
md: 'array_size' sysfs attribute
Allow userspace to set the size of the array according to the following semantics: 1/ size must be <= to the size returned by mddev->pers->size(mddev, 0, 0) a) If size is set before the array is running, do_md_run will fail if size is greater than the default size b) A reshape attempt that reduces the default size to less than the set array size should be blocked 2/ once userspace sets the size the kernel will not change it 3/ writing 'default' to this attribute returns control of the size to the kernel and reverts to the size reported by the personality Also, convert locations that need to know the default size from directly reading ->array_sectors to <pers>_size. Resync/reshape operations always follow the default size. Finally, fixup other locations that read a number of 1k-blocks from userspace to use strict_blocks_to_sectors() which checks for unsigned long long to sector_t overflow and blocks to sectors overflow. Reviewed-by: Andre Noll <maan@systemlinux.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/raid0.c')
-rw-r--r--drivers/md/raid0.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 6f7e538c876..c08d7559be5 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -313,7 +313,7 @@ static int raid0_run (mddev_t *mddev)
printk(KERN_INFO "raid0 : conf->spacing is %llu sectors.\n",
(unsigned long long)conf->spacing);
{
- sector_t s = mddev->array_sectors;
+ sector_t s = raid0_size(mddev, 0, 0);
sector_t space = conf->spacing;
int round;
conf->sector_shift = 0;