This patch added a function tcmu_execute_pr_read_keys() which
can help handle Persistent Reservation Read Keys.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 74 +++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 2fcdfc97ca75..a89c866a755d 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2846,6 +2846,80 @@ static int tcmu_pr_info_mock_empty(struct tcmu_pr_info **_pr_info)
return 0;
}
+static sense_reason_t
+tcmu_execute_pr_read_keys(struct se_cmd *cmd, unsigned char *buf, u32 buf_len)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct tcmu_pr_info *pr_info = NULL;
+ struct tcmu_pr_reg *reg;
+ u32 add_len = 0, off = 8;
+ int rc;
+ struct tcmu_dev *udev = TCMU_DEV(dev);
+
+ udev->pr_info.pr_info_buf = kzalloc(TCMU_PR_INFO_XATTR_MAX_SIZE,
+ GFP_KERNEL);
+ if (!udev->pr_info.pr_info_buf)
+ return TCM_OUT_OF_RESOURCES;
+
+ if (buf_len < 8) {
+ WARN_ON(1);
+ kfree(udev->pr_info.pr_info_buf);
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+
+ pr_debug("getting pr_info for buf: %p, %u\n", buf, buf_len);
+
+ rc = tcmu_pr_info_get(udev, &pr_info, NULL, NULL);
+ if (rc == -ENODATA) {
+ pr_debug("PR info not present for read, mocking empty\n");
+ rc = tcmu_pr_info_mock_empty(&pr_info);
+ }
+ if (rc < 0) {
+ kfree(udev->pr_info.pr_info_buf);
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+ pr_debug("packing read_keys response buf: %p, %u\n", buf, buf_len);
+
+ buf[0] = ((pr_info->gen >> 24) & 0xff);
+ buf[1] = ((pr_info->gen >> 16) & 0xff);
+ buf[2] = ((pr_info->gen >> 8) & 0xff);
+ buf[3] = (pr_info->gen & 0xff);
+
+ pr_debug("packed gen %u in read_keys response\n", pr_info->gen);
+
+ list_for_each_entry(reg, &pr_info->regs, regs_node) {
+ /*
+ * Check for overflow of 8byte PRI READ_KEYS payload and
+ * next reservation key list descriptor.
+ */
+ if ((add_len + 8) > (buf_len - 8))
+ break;
+
+ buf[off++] = ((reg->key >> 56) & 0xff);
+ buf[off++] = ((reg->key >> 48) & 0xff);
+ buf[off++] = ((reg->key >> 40) & 0xff);
+ buf[off++] = ((reg->key >> 32) & 0xff);
+ buf[off++] = ((reg->key >> 24) & 0xff);
+ buf[off++] = ((reg->key >> 16) & 0xff);
+ buf[off++] = ((reg->key >> 8) & 0xff);
+ buf[off++] = (reg->key & 0xff);
+ pr_debug("packed key 0x%llx in read_keys response\n", reg->key);
+
+ add_len += 8;
+ }
+
+ buf[4] = ((add_len >> 24) & 0xff);
+ buf[5] = ((add_len >> 16) & 0xff);
+ buf[6] = ((add_len >> 8) & 0xff);
+ buf[7] = (add_len & 0xff);
+
+ pr_debug("packed len %u in read_keys response\n", add_len);
+ tcmu_pr_info_free(pr_info);
+ kfree(udev->pr_info.pr_info_buf);
+
+ return TCM_NO_SENSE;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
--
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