From 584b886aee3aff5fe7eb21e30f779eb5cd1daa36 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 31 May 2012 15:39:11 +1000 Subject: md: raid1/raid10: fix problem with merge_bvec_fn commit aba336bd1d46d6b0404b06f6915ed76150739057 upstream. The new merge_bvec_fn which calls the corresponding function in subsidiary devices requires that mddev->merge_check_needed be set if any child has a merge_bvec_fn. However were were only setting that when a device was hot-added, not when a device was present from the start. This bug was introduced in 3.4 so patch is suitable for 3.4.y kernels. However that are conflicts in raid10.c so a separate patch will be needed for 3.4.y. Reported-by: Sebastian Riemer Signed-off-by: NeilBrown Signed-off-by: Greg Kroah-Hartman --- drivers/md/raid1.c | 4 ++++ drivers/md/raid10.c | 5 ++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 15dd59b84e94..d7e957721456 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -2548,6 +2548,7 @@ static struct r1conf *setup_conf(struct mddev *mddev) err = -EINVAL; spin_lock_init(&conf->device_lock); rdev_for_each(rdev, mddev) { + struct request_queue *q; int disk_idx = rdev->raid_disk; if (disk_idx >= mddev->raid_disks || disk_idx < 0) @@ -2560,6 +2561,9 @@ static struct r1conf *setup_conf(struct mddev *mddev) if (disk->rdev) goto abort; disk->rdev = rdev; + q = bdev_get_queue(rdev->bdev); + if (q->merge_bvec_fn) + mddev->merge_check_needed = 1; disk->head_position = 0; } diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 3f91c2e1dfe7..d037adb295ac 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3311,7 +3311,7 @@ static int run(struct mddev *mddev) (conf->raid_disks / conf->near_copies)); rdev_for_each(rdev, mddev) { - + struct request_queue *q; disk_idx = rdev->raid_disk; if (disk_idx >= conf->raid_disks || disk_idx < 0) @@ -3327,6 +3327,9 @@ static int run(struct mddev *mddev) goto out_free_conf; disk->rdev = rdev; } + q = bdev_get_queue(rdev->bdev); + if (q->merge_bvec_fn) + mddev->merge_check_needed = 1; disk_stack_limits(mddev->gendisk, rdev->bdev, rdev->data_offset << 9); -- cgit v1.2.3