This patch added a function tcmu_pr_info_get() which can help
get Persistent Reservation information from a TCMU device.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 51 +++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 12f4a5a5c1e1..0f8eeed61c60 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2253,6 +2253,57 @@ static int tcmu_pr_info_decode(char *pr_xattr, int pr_xattr_len,
return rc;
}
+static int tcmu_pr_info_get(struct tcmu_dev *udev,
+ struct tcmu_pr_info **_pr_info,
+ char **_pr_xattr, int *_pr_xattr_len)
+{
+ int rc;
+ char *pr_xattr = udev->pr_info.pr_info_buf;
+ char *dup_xattr = NULL;
+ int pr_xattr_len = 0;
+ struct tcmu_pr_info *pr_info = NULL;
+
+ if (!_pr_info) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ rc = tcmu_get_dev_pr_info(udev, &pr_xattr_len);
+
+ if (rc) {
+ if (rc != -ENODATA)
+ pr_err("failed to obtain PR xattr: %d\n", rc);
+ return rc;
+ }
+
+ if (_pr_xattr) {
+ /* dup before decode, which trashes @pr_xattr */
+ dup_xattr = kstrdup(pr_xattr, GFP_KERNEL);
+ if (!dup_xattr)
+ return -ENOMEM;
+ }
+
+ rc = tcmu_pr_info_decode(pr_xattr, pr_xattr_len, &pr_info);
+ if (rc) {
+ pr_err("failed to decode PR xattr: %d\n", rc);
+ goto err_dup_xattr_free;
+ }
+
+ if (_pr_xattr) {
+ WARN_ON(!_pr_xattr_len);
+ *_pr_xattr = dup_xattr;
+ *_pr_xattr_len = pr_xattr_len;
+ }
+
+ *_pr_info = pr_info;
+ pr_debug("successfully obtained PR info\n");
+ return 0;
+
+err_dup_xattr_free:
+ kfree(dup_xattr);
+ return rc;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
--
To unsubscribe from this list: send the line "unsubscribe target-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
