On Sun, Apr 28, 2013 at 08:54:46AM +0800, Shaohua Li wrote:
> On Sat, Apr 27, 2013 at 06:29:49PM +0200, Markus wrote:
> > Hi!
> >
> > Now I had the time to bisect, started with 3.7 as good and 3.8 as bad.
> > 0cfbcafcae8b7364b5fa96c2b26ccde7a3a296a9 is the bad commit. [1]
> > block: add plug for blkdev_issue_discard
> >
> > While 3.8.10 was still bad, the same kernel with the reverted patch applied
> > is fine.
> Thanks for the reporting. Does below patch work for you?
Oops, there is a typo there, should be this one:
---
drivers/md/raid1.c | 7 ++++++-
drivers/md/raid10.c | 7 ++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
Index: linux/drivers/md/raid1.c
===================================================================
--- linux.orig/drivers/md/raid1.c 2013-03-07 14:14:05.950824173 +0800
+++ linux/drivers/md/raid1.c 2013-04-28 08:57:17.874058434 +0800
@@ -981,7 +981,12 @@ static void raid1_unplug(struct blk_plug
while (bio) { /* submit pending writes */
struct bio *next = bio->bi_next;
bio->bi_next = NULL;
- generic_make_request(bio);
+ if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+ !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
+ /* Just ignore it */
+ bio_endio(bio, 0);
+ else
+ generic_make_request(bio);
bio = next;
}
kfree(plug);
Index: linux/drivers/md/raid10.c
===================================================================
--- linux.orig/drivers/md/raid10.c 2013-03-07 14:14:05.950824173 +0800
+++ linux/drivers/md/raid10.c 2013-04-28 08:57:44.765719067 +0800
@@ -1133,7 +1133,12 @@ static void raid10_unplug(struct blk_plu
while (bio) { /* submit pending writes */
struct bio *next = bio->bi_next;
bio->bi_next = NULL;
- generic_make_request(bio);
+ if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+ !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
+ /* Just ignore it */
+ bio_endio(bio, 0);
+ else
+ generic_make_request(bio);
bio = next;
}
kfree(plug);
--
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