Commit 24b961f8 authored by Jes Sorensen's avatar Jes Sorensen Committed by NeilBrown

md: Avoid OOPS when reshaping raid1 to raid0

raid1 arrays do not have the notion of chunk size. Calculate the
largest chunk sector size we can use to avoid a divide by zero OOPS
when aligning the size of the new array to the chunk size.
Signed-off-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 18b9837e
......@@ -632,6 +632,7 @@ static void *raid0_takeover_raid10(struct mddev *mddev)
static void *raid0_takeover_raid1(struct mddev *mddev)
{
struct r0conf *priv_conf;
int chunksect;
/* Check layout:
* - (N - 1) mirror drives must be already faulty
......@@ -642,10 +643,25 @@ static void *raid0_takeover_raid1(struct mddev *mddev)
return ERR_PTR(-EINVAL);
}
/*
* a raid1 doesn't have the notion of chunk size, so
* figure out the largest suitable size we can use.
*/
chunksect = 64 * 2; /* 64K by default */
/* The array must be an exact multiple of chunksize */
while (chunksect && (mddev->array_sectors & (chunksect - 1)))
chunksect >>= 1;
if ((chunksect << 9) < PAGE_SIZE)
/* array size does not allow a suitable chunk size */
return ERR_PTR(-EINVAL);
/* Set new parameters */
mddev->new_level = 0;
mddev->new_layout = 0;
mddev->new_chunk_sectors = 128; /* by default set chunk size to 64k */
mddev->new_chunk_sectors = chunksect;
mddev->chunk_sectors = chunksect;
mddev->delta_disks = 1 - mddev->raid_disks;
mddev->raid_disks = 1;
/* make sure it will be not marked as dirty */
......
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