1 files changed, 27 insertions, 10 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 6e8aa213f0d5..bd06ea21756c 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -67,6 +67,7 @@ static int max_queued_requests = 1024;
 
 static void allow_barrier(struct r10conf *conf);
 static void lower_barrier(struct r10conf *conf);
+static int enough(struct r10conf *conf, int ignore);
 
 static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
 {
@@ -347,6 +348,19 @@ static void raid10_end_read_request(struct bio *bio, int error)
 		 * wait for the 'master' bio.
 		 */
 		set_bit(R10BIO_Uptodate, &r10_bio->state);
+	} else {
+		/* If all other devices that store this block have
+		 * failed, we want to return the error upwards rather
+		 * than fail the last device.  Here we redefine
+		 * "uptodate" to mean "Don't want to retry"
+		 */
+		unsigned long flags;
+		spin_lock_irqsave(&conf->device_lock, flags);
+		if (!enough(conf, rdev->raid_disk))
+			uptodate = 1;
+		spin_unlock_irqrestore(&conf->device_lock, flags);
+	}
+	if (uptodate) {
 		raid_end_bio_io(r10_bio);
 		rdev_dec_pending(rdev, conf->mddev);
 	} else {
@@ -2052,6 +2066,7 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
 		       "md/raid10:%s: %s: Failing raid device\n",
 		       mdname(mddev), b);
 		md_error(mddev, conf->mirrors[d].rdev);
+		r10_bio->devs[r10_bio->read_slot].bio = IO_BLOCKED;
 		return;
 	}
 
@@ -2105,8 +2120,11 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
 				    rdev,
 				    r10_bio->devs[r10_bio->read_slot].addr
 				    + sect,
-				    s, 0))
+				    s, 0)) {
 				md_error(mddev, rdev);
+				r10_bio->devs[r10_bio->read_slot].bio
+					= IO_BLOCKED;
+			}
 			break;
 		}
 
@@ -2299,17 +2317,20 @@ static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio)
 	 * This is all done synchronously while the array is
 	 * frozen.
 	 */
+	bio = r10_bio->devs[slot].bio;
+	bdevname(bio->bi_bdev, b);
+	bio_put(bio);
+	r10_bio->devs[slot].bio = NULL;
+
 	if (mddev->ro == 0) {
 		freeze_array(conf);
 		fix_read_error(conf, mddev, r10_bio);
 		unfreeze_array(conf);
-	}
+	} else
+		r10_bio->devs[slot].bio = IO_BLOCKED;
+
 	rdev_dec_pending(rdev, mddev);
 
-	bio = r10_bio->devs[slot].bio;
-	bdevname(bio->bi_bdev, b);
-	r10_bio->devs[slot].bio =
-		mddev->ro ? IO_BLOCKED : NULL;
 read_more:
 	rdev = read_balance(conf, r10_bio, &max_sectors);
 	if (rdev == NULL) {
@@ -2318,13 +2339,10 @@ read_more:
 		       mdname(mddev), b,
 		       (unsigned long long)r10_bio->sector);
 		raid_end_bio_io(r10_bio);
-		bio_put(bio);
 		return;
 	}
 
 	do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
-	if (bio)
-		bio_put(bio);
 	slot = r10_bio->read_slot;
 	printk_ratelimited(
 		KERN_ERR
@@ -2360,7 +2378,6 @@ read_more:
 			mbio->bi_phys_segments++;
 		spin_unlock_irq(&conf->device_lock);
 		generic_make_request(bio);
-		bio = NULL;
 
 		r10_bio = mempool_alloc(conf->r10bio_pool,
 					GFP_NOIO);