mirror of https://gitee.com/openkylin/linux.git
xen/blkback: Move processing of BLKIF_OP_DISCARD from dispatch_rw_block_io
.. and move it to its own function that will deal with the discard operation. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
parent
5ea4298669
commit
421463526f
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@ -416,12 +416,16 @@ static int xen_blkbk_map(struct blkif_request *req,
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return ret;
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}
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static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
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static int dispatch_discard_io(struct xen_blkif *blkif,
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struct blkif_request *req)
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{
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int err = 0;
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int status = BLKIF_RSP_OKAY;
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struct block_device *bdev = blkif->vbd.bdev;
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blkif->st_ds_req++;
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xen_blkif_get(blkif);
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if (blkif->blk_backend_type == BLKIF_BACKEND_PHY) {
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unsigned long secure = (blkif->vbd.discard_secure &&
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(req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
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@ -453,6 +457,8 @@ static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
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status = BLKIF_RSP_ERROR;
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make_response(blkif, req->u.discard.id, req->operation, status);
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xen_blkif_put(blkif);
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return err;
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}
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static void xen_blk_drain_io(struct xen_blkif *blkif)
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@ -576,8 +582,11 @@ __do_block_io_op(struct xen_blkif *blkif)
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/* Apply all sanity checks to /private copy/ of request. */
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barrier();
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if (dispatch_rw_block_io(blkif, &req, pending_req))
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if (unlikely(req.operation == BLKIF_OP_DISCARD)) {
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free_req(pending_req);
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if (dispatch_discard_io(blkif, &req))
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break;
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} else if (dispatch_rw_block_io(blkif, &req, pending_req))
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break;
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/* Yield point for this unbounded loop. */
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@ -636,24 +645,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
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blkif->st_f_req++;
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operation = WRITE_FLUSH;
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break;
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case BLKIF_OP_DISCARD:
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blkif->st_ds_req++;
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operation = REQ_DISCARD;
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break;
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default:
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operation = 0; /* make gcc happy */
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goto fail_response;
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break;
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}
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if (unlikely(operation == REQ_DISCARD))
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nseg = 0;
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else
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/* Check that the number of segments is sane. */
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nseg = req->u.rw.nr_segments;
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/* Check that the number of segments is sane. */
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nseg = req->u.rw.nr_segments;
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if (unlikely(nseg == 0 && operation != WRITE_FLUSH &&
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operation != REQ_DISCARD) ||
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if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
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unlikely(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) {
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pr_debug(DRV_PFX "Bad number of segments in request (%d)\n",
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nseg);
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@ -714,7 +715,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
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* the hypercall to unmap the grants - that is all done in
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* xen_blkbk_unmap.
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*/
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if (nseg && xen_blkbk_map(req, pending_req, seg))
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if (xen_blkbk_map(req, pending_req, seg))
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goto fail_flush;
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/*
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@ -746,23 +747,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
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/* This will be hit if the operation was a flush or discard. */
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if (!bio) {
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BUG_ON(operation != WRITE_FLUSH && operation != REQ_DISCARD);
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BUG_ON(operation != WRITE_FLUSH);
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if (operation == WRITE_FLUSH) {
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bio = bio_alloc(GFP_KERNEL, 0);
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if (unlikely(bio == NULL))
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goto fail_put_bio;
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bio = bio_alloc(GFP_KERNEL, 0);
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if (unlikely(bio == NULL))
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goto fail_put_bio;
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biolist[nbio++] = bio;
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bio->bi_bdev = preq.bdev;
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bio->bi_private = pending_req;
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bio->bi_end_io = end_block_io_op;
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} else if (operation == REQ_DISCARD) {
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xen_blk_discard(blkif, req);
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xen_blkif_put(blkif);
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free_req(pending_req);
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return 0;
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}
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biolist[nbio++] = bio;
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bio->bi_bdev = preq.bdev;
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bio->bi_private = pending_req;
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bio->bi_end_io = end_block_io_op;
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}
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/*
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