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vhost/scsi: Convert completion path to use copy_to_iter

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Required for ANY_LAYOUT support when the incoming virtio-scsi response
header + fixed size sense buffer payload may span more than a single
iovec entry.

This changes existing code to save cmd->tvc_resp_iov instead of the
first single iovec base pointer from &vq->iov[out].

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-01-27 13:13:12 -08:00
parent b44a2b6790
commit 79c14141a4
1 changed files with 12 additions and 5 deletions
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17
drivers/vhost/scsi.c
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@ -72,6 +72,8 @@ struct tcm_vhost_cmd {
int tvc_vq_desc;
/* virtio-scsi initiator task attribute */
int tvc_task_attr;
/* virtio-scsi response incoming iovecs */
int tvc_in_iovs;
/* virtio-scsi initiator data direction */
enum dma_data_direction tvc_data_direction;
/* Expected data transfer length from virtio-scsi header */
@ -87,8 +89,8 @@ struct tcm_vhost_cmd {
struct scatterlist *tvc_sgl;
struct scatterlist *tvc_prot_sgl;
struct page **tvc_upages;
/* Pointer to response */
struct virtio_scsi_cmd_resp __user *tvc_resp;
/* Pointer to response header iovec */
struct iovec *tvc_resp_iov;
/* Pointer to vhost_scsi for our device */
struct vhost_scsi *tvc_vhost;
/* Pointer to vhost_virtqueue for the cmd */
@ -682,6 +684,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
struct tcm_vhost_cmd *cmd;
struct llist_node *llnode;
struct se_cmd *se_cmd;
struct iov_iter iov_iter;
int ret, vq;
bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
@ -703,8 +706,11 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
se_cmd->scsi_sense_length);
memcpy(v_rsp.sense, cmd->tvc_sense_buf,
se_cmd->scsi_sense_length);
ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
if (likely(ret == 0)) {
iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
cmd->tvc_in_iovs, sizeof(v_rsp));
ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
if (likely(ret == sizeof(v_rsp))) {
struct vhost_scsi_virtqueue *q;
vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
@ -1159,7 +1165,8 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
cmd->tvc_vhost = vs;
cmd->tvc_vq = vq;
cmd->tvc_resp = vq->iov[out].iov_base;
cmd->tvc_resp_iov = &vq->iov[out];
cmd->tvc_in_iovs = in;
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
cmd->tvc_cdb[0], cmd->tvc_lun);