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xen-blkfront: remove frame list from blk_shadow
We already have the frame (pfn of the grant page) stored inside struct grant, so there's no need to keep an aditional list of mapped frames for a specific request. This reduces memory usage in blkfront. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xen.org Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -74,7 +74,6 @@ struct grant {
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struct blk_shadow {
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struct blk_shadow {
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struct blkif_request req;
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struct blkif_request req;
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struct request *request;
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struct request *request;
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unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct grant *grants_used[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct grant *grants_used[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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};
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};
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@ -356,7 +355,6 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
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static int blkif_queue_request(struct request *req)
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static int blkif_queue_request(struct request *req)
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{
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{
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struct blkfront_info *info = req->rq_disk->private_data;
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struct blkfront_info *info = req->rq_disk->private_data;
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unsigned long buffer_mfn;
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struct blkif_request *ring_req;
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struct blkif_request *ring_req;
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unsigned long id;
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unsigned long id;
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unsigned int fsect, lsect;
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unsigned int fsect, lsect;
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@ -434,7 +432,6 @@ static int blkif_queue_request(struct request *req)
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gnt_list_entry = get_grant(&gref_head, info);
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gnt_list_entry = get_grant(&gref_head, info);
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ref = gnt_list_entry->gref;
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ref = gnt_list_entry->gref;
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buffer_mfn = pfn_to_mfn(gnt_list_entry->pfn);
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info->shadow[id].grants_used[i] = gnt_list_entry;
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info->shadow[id].grants_used[i] = gnt_list_entry;
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@ -465,7 +462,6 @@ static int blkif_queue_request(struct request *req)
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kunmap_atomic(shared_data);
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kunmap_atomic(shared_data);
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}
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}
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info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
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ring_req->u.rw.seg[i] =
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ring_req->u.rw.seg[i] =
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(struct blkif_request_segment) {
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(struct blkif_request_segment) {
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.gref = ref,
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.gref = ref,
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@ -1268,7 +1264,7 @@ static int blkif_recover(struct blkfront_info *info)
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gnttab_grant_foreign_access_ref(
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gnttab_grant_foreign_access_ref(
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req->u.rw.seg[j].gref,
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req->u.rw.seg[j].gref,
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info->xbdev->otherend_id,
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info->xbdev->otherend_id,
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pfn_to_mfn(info->shadow[req->u.rw.id].frame[j]),
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pfn_to_mfn(copy[i].grants_used[j]->pfn),
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0);
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0);
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}
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}
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info->shadow[req->u.rw.id].req = *req;
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info->shadow[req->u.rw.id].req = *req;
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