This patch added a struct tcmu_pr_reg which contain Persistent Reservation registrations information, also added two functions tcmu_pr_info_reg_decode() and tcmu_pr_info_reg_encode() to handle it.
Signed-off-by: Zhu Lingshan <[email protected]> --- 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 8e61641f34ac..55f1ba98a688 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -228,6 +228,13 @@ struct tcmu_scsi2_rsv { char it_nexus[TCMU_PR_IT_NEXUS_MAXLEN]; }; +struct tcmu_pr_reg { + struct list_head regs_node; + u64 key; /* registered key */ + /* I-T nexus for registration */ + char it_nexus[TCMU_PR_IT_NEXUS_MAXLEN]; +}; + /* * To avoid dead lock the mutex lock order should always be: * @@ -2080,6 +2087,50 @@ static int tcmu_pr_info_num_regs_encode(char *buf, size_t buf_remain, return rc; } +static int tcmu_pr_info_reg_decode(char *str, struct tcmu_pr_reg **_reg) +{ + struct tcmu_pr_reg *reg; + int rc; + + if (!_reg) { + WARN_ON(1); + return -EINVAL; + } + + reg = kzalloc(sizeof(*reg), GFP_KERNEL); + if (!reg) + return -ENOMEM; + + /* registration key and I-T nexus with space separator */ + rc = sscanf(str, "0x%016llx %" __stringify(TCMU_PR_IT_NEXUS_MAXLEN) + "s", ®->key, reg->it_nexus); + if (rc != 2) { + pr_err("failed to parse PR reg: %s\n", str); + kfree(reg); + return -EINVAL; + } + + pr_debug("processed pr_info reg: %s\n", str); + *_reg = reg; + + return 0; +} + +static int tcmu_pr_info_reg_encode(char *buf, size_t buf_remain, + struct tcmu_pr_reg *reg) +{ + int rc; + + rc = snprintf(buf, buf_remain, "0x%016llx %s\n", reg->key, + reg->it_nexus); + if ((rc < 0) || (rc >= buf_remain)) { + pr_err("failed to encode PR registration\n"); + return -EINVAL; + } + + return rc; +} + static int tcmu_configure_device(struct se_device *dev) { struct tcmu_dev *udev = TCMU_DEV(dev); -- 2.17.1
