From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Return EAGAIN in case RAID5 would block because of waiting due to:
+ Reshaping
+ Suspension
+ Stripe Expansion
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
drivers/md/raid5.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index aeeb8d6854e2..d1b3bcf26d29 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5635,6 +5635,11 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
? logical_sector < conf->reshape_safe
: logical_sector >= conf->reshape_safe) {
spin_unlock_irq(&conf->device_lock);
+ if (bi->bi_opf & REQ_NOWAIT) {
+ bio_wouldblock_error(bi);
+ finish_wait(&conf->wait_for_overlap, &w);
+ return true;
+ }
schedule();
do_prepare = true;
goto retry;
@@ -5672,6 +5677,11 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
spin_unlock_irq(&conf->device_lock);
if (must_retry) {
raid5_release_stripe(sh);
+ if (bi->bi_opf & REQ_NOWAIT) {
+ bio_wouldblock_error(bi);
+ finish_wait(&conf->wait_for_overlap, &w);
+ return true;
+ }
schedule();
do_prepare = true;
goto retry;
@@ -5700,6 +5710,11 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
sigset_t full, old;
sigfillset(&full);
sigprocmask(SIG_BLOCK, &full, &old);
+ if (bi->bi_opf & REQ_NOWAIT) {
+ bio_wouldblock_error(bi);
+ finish_wait(&conf->wait_for_overlap, &w);
+ return true;
+ }
schedule();
sigprocmask(SIG_SETMASK, &old, NULL);
do_prepare = true;
@@ -5715,6 +5730,11 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
*/
md_wakeup_thread(mddev->thread);
raid5_release_stripe(sh);
+ if (bi->bi_opf & REQ_NOWAIT) {
+ bio_wouldblock_error(bi);
+ finish_wait(&conf->wait_for_overlap, &w);
+ return true;
+ }
schedule();
do_prepare = true;
goto retry;
--
2.12.3
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
