drbd: always use_bmbv, ignore setting
Now that the peer may handle multi-bio EEs, we can ignore the peer's limit, and concentrate on the limits of the local IO stack. This is safe accross drbd protocol versions, as our queue_max_sectors() will be adjusted accordingly. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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bb3d000cb9
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a1c88d0d7a
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@ -704,9 +704,6 @@ void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __mu
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struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
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int max_segments = mdev->ldev->dc.max_bio_bvecs;
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if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv)
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max_seg_s = PAGE_SIZE;
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max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
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blk_queue_max_hw_sectors(q, max_seg_s >> 9);
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@ -3011,7 +3011,11 @@ static int receive_sizes(struct drbd_conf *mdev, struct p_header *h)
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ldsc = 1;
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}
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max_seg_s = be32_to_cpu(p->max_segment_size);
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if (mdev->agreed_pro_version < 94)
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max_seg_s = be32_to_cpu(p->max_segment_size);
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else /* drbd 8.3.8 onwards */
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max_seg_s = DRBD_MAX_SEGMENT_SIZE;
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if (max_seg_s != queue_max_segment_size(mdev->rq_queue))
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drbd_setup_queue_param(mdev, max_seg_s);
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@ -1110,7 +1110,7 @@ int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct
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} else if (limit && get_ldev(mdev)) {
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struct request_queue * const b =
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mdev->ldev->backing_bdev->bd_disk->queue;
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if (b->merge_bvec_fn && mdev->ldev->dc.use_bmbv) {
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if (b->merge_bvec_fn) {
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backing_limit = b->merge_bvec_fn(b, bvm, bvec);
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limit = min(limit, backing_limit);
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}
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