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 <[email protected]> --- 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
