When try to register an IT_Nexus, if tcmu_pr_info_get()
returns -ENODATA, this means the string stored on the
TCMU DEVICE records(for example, RBD metadata) which represent
Persistent Reservation information is empty,there are no
registrations, we should initialize a new struct
tcmu_pr_info.
This patch added a function tcmu_pr_info_init() to initialize
Persistent Reservation struct tcmu_pr_info, encode it to a
string, and store this string in the TCMU device records.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 48 +++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 957e444d853b..8d860b59d277 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2437,6 +2437,54 @@ static int tcmu_pr_info_encode(struct tcmu_pr_info *pr_info,
return rc;
}
+static int tcmu_pr_info_init(struct tcmu_dev *udev,
+ struct tcmu_pr_info **_pr_info,
+ char **_pr_xattr, int *_pr_xattr_len)
+{
+ struct tcmu_pr_info *pr_info;
+ char *pr_xattr = NULL;
+ int pr_xattr_len = 0;
+ int rc;
+
+ pr_info = kzalloc(sizeof(*pr_info), GFP_KERNEL);
+ if (!pr_info)
+ return -ENOMEM;
+
+ pr_info->vers = TCMU_PR_INFO_XATTR_VERS;
+ INIT_LIST_HEAD(&pr_info->regs);
+ pr_info->seq = 1;
+
+ rc = tcmu_pr_info_encode(pr_info, &pr_xattr, &pr_xattr_len);
+ if (rc) {
+ pr_err("failed to encode PR xattr: %d\n", rc);
+ goto err_info_free;
+ }
+
+ rc = tcmu_set_dev_pr_info(udev, pr_xattr);
+ if (rc) {
+ pr_err("failed to set PR xattr: %d\n", rc);
+ goto err_xattr_free;
+ }
+
+ *_pr_info = pr_info;
+ if (_pr_xattr) {
+ WARN_ON(!_pr_xattr_len);
+ *_pr_xattr = pr_xattr;
+ *_pr_xattr_len = pr_xattr_len;
+ } else {
+ kfree(pr_xattr);
+ }
+ pr_debug("successfully initialized PR info\n");
+
+ return 0;
+
+err_xattr_free:
+ kfree(pr_xattr);
+err_info_free:
+ kfree(pr_info);
+ return rc;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
--
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