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vhost-scsi: Return queue full for page alloc failures during copy

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[ Upstream commit 891b99eab0f89dbe08d216f4ab71acbeaf7a3102 ]

This has us return queue full if we can't allocate a page during the
copy operation so the initiator can retry.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20241203191705.19431-5-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mike Christie
2024-12-03 13:15:11 -06:00
committed by Greg Kroah-Hartman
parent de4469a900
commit f5121d5ba7
1 changed files with 9 additions and 6 deletions
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15
drivers/vhost/scsi.c
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@@ -751,7 +751,7 @@ vhost_scsi_copy_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
size_t len = iov_iter_count(iter);
unsigned int nbytes = 0;
struct page *page;
int i;
int i, ret;
if (cmd->tvc_data_direction == DMA_FROM_DEVICE) {
cmd->saved_iter_addr = dup_iter(&cmd->saved_iter, iter,
@@ -764,6 +764,7 @@ vhost_scsi_copy_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
page = alloc_page(GFP_KERNEL);
if (!page) {
i--;
ret = -ENOMEM;
goto err;
}
@@ -771,8 +772,10 @@ vhost_scsi_copy_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
sg_set_page(&sg[i], page, nbytes, 0);
if (cmd->tvc_data_direction == DMA_TO_DEVICE &&
copy_page_from_iter(page, 0, nbytes, iter) != nbytes)
copy_page_from_iter(page, 0, nbytes, iter) != nbytes) {
ret = -EFAULT;
goto err;
}
len -= nbytes;
}
@@ -787,7 +790,7 @@ err:
for (; i >= 0; i--)
__free_page(sg_page(&sg[i]));
kfree(cmd->saved_iter_addr);
return -ENOMEM;
return ret;
}
static int
@@ -1226,9 +1229,9 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
" %d\n", cmd, exp_data_len, prot_bytes, data_direction);
if (data_direction != DMA_NONE) {
if (unlikely(vhost_scsi_mapal(cmd, prot_bytes,
&prot_iter, exp_data_len,
&data_iter))) {
ret = vhost_scsi_mapal(cmd, prot_bytes, &prot_iter,
exp_data_len, &data_iter);
if (unlikely(ret)) {
vq_err(vq, "Failed to map iov to sgl\n");
vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd);
goto err;