On Thu, 07 Jun 2012 06:39:33 +0900 <[email protected]> wrote:
> > The patch below does not apply to the 3.4-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <[email protected]>. > Here is the 3.4-based version. Thanks. From: NeilBrown <[email protected]> Date: Thu, 31 May 2012 15:39:11 +1000 Subject: [PATCH] md: raid1/raid10: fix problem with merge_bvec_fn commit aba336bd1d46d6b0404b06f6915ed76150739057 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. Cc: [email protected] Reported-by: Sebastian Riemer <[email protected]> Signed-off-by: NeilBrown <[email protected]> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 15dd59b..d7e9577 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 3f91c2e..d037adb 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);
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