This patch added three functions, tcmu_pr_info_vers_seq_encode()
to encode PR sequence and version into a string,
tcmu_pr_info_vers_decode() and tcmu_pr_info_seq_decode() used
to decode them.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 62 +++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 26d8aee40719..ccb1607edd0a 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -93,6 +93,8 @@
*/
#define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024)
+#define TCMU_PR_INFO_XATTR_VERS 1
+
static u8 tcmu_kern_cmd_reply_supported;
static struct device *tcmu_root_device;
@@ -1813,6 +1815,66 @@ tcmu_gen_it_nexus(struct se_session *se_sess,
return 0;
}
+static int
+tcmu_pr_info_seq_decode(char *str, u32 *seq)
+{
+ int rc;
+
+ if (!seq) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+ rc = sscanf(str, "0x%08x", seq);
+ if (rc != 1) {
+ pr_err("failed to decode PR info seqnum in: %s\n", str);
+ return -EINVAL;
+ }
+
+ pr_debug("processed pr_info seqnum: %u\n", *seq);
+
+ return 0;
+}
+
+static int
+tcmu_pr_info_vers_seq_encode(char *buf, size_t buf_remain, u32 vers, u32 seq)
+{
+ int rc;
+
+ rc = snprintf(buf, buf_remain, "0x%08x\n0x%08x\n",
+ vers, seq);
+ if ((rc < 0) || (rc >= buf_remain)) {
+ pr_err("failed to encode PR vers and seq\n");
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+static int
+tcmu_pr_info_vers_decode(char *str, u32 *vers)
+{
+ int rc;
+
+ if (!vers) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+ rc = sscanf(str, "0x%08x", vers);
+ if (rc != 1) {
+ pr_err("failed to decode PR info version in: %s\n", str);
+ return -EINVAL;
+ }
+
+ if (*vers != TCMU_PR_INFO_XATTR_VERS) {
+ pr_err("unsupported PR info version: %u\n", *vers);
+ return -EINVAL;
+ }
+
+ pr_debug("processed pr_info version: %u\n", *vers);
+
+ return 0;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
--
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