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md: don't require sync_min to be a multiple of chunk_size.

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There is really no need for sync_min to be a multiple of
chunk_size, and values read from here often aren't.
That means you cannot read a value and expect to be able
to write it back later.

So remove the chunk_size check, and round down to a multiple
of 4K, to be sure everything works with 4K-sector devices.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2015-03-23 17:36:38 +11:00
parent d51e4fe6d6
commit 50c37b136a
1 changed files with 2 additions and 11 deletions
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13
drivers/md/md.c
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@ -4427,7 +4427,6 @@ min_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long min;
int err;
int chunk;
if (kstrtoull(buf, 10, &min))
return -EINVAL;
@ -4441,16 +4440,8 @@ min_sync_store(struct mddev *mddev, const char *buf, size_t len)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
goto out_unlock;
/* Must be a multiple of chunk_size */
chunk = mddev->chunk_sectors;
if (chunk) {
sector_t temp = min;
err = -EINVAL;
if (sector_div(temp, chunk))
goto out_unlock;
}
mddev->resync_min = min;
/* Round down to multiple of 4K for safety */
mddev->resync_min = round_down(min, 8);
err = 0;
out_unlock: