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md/raid5: suspend shouldn't affect read requests. 

md allows write to regions on an array to be suspended temporarily.
This allows user-space to participate is aspects of reshape.
In particular, data can be copied with not risk of a race.
We should not be blocking read requests though, so don't.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-07-01 13:15:35 +10:00
parent 0909dc448c
commit a5c308d4d1
1 changed files with 2 additions and 1 deletions
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3
drivers/md/raid5.c
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@ -3702,7 +3702,8 @@ static int make_request(struct request_queue *q, struct bio * bi)
/* FIXME what if we get a false positive because these /* FIXME what if we get a false positive because these
* are being updated. * are being updated.
*/ */
if (logical_sector >= mddev->suspend_lo && if (bio_data_dir(bi) == WRITE &&
logical_sector >= mddev->suspend_lo &&
logical_sector < mddev->suspend_hi) { logical_sector < mddev->suspend_hi) {
release_stripe(sh); release_stripe(sh);
schedule(); schedule();