This patch added two functions: tcmu_pr_info_scsi2_rsv_encode() and tcmu_pr_info_scsi2_rsv_decode() to encode and decode SCSI2 Reservations. Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx> --- drivers/target/target_core_user.c | 65 +++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index ccb1607edd0a..50723ac0ed22 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -94,6 +94,9 @@ #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) #define TCMU_PR_INFO_XATTR_VERS 1 +#define TCMU_PR_INFO_XATTR_VAL_SCSI2_RSV_ABSENT "No SPC-2 Reservation holder" + +#define TCMU_PR_IT_NEXUS_MAXLEN 484 static u8 tcmu_kern_cmd_reply_supported; @@ -200,6 +203,14 @@ struct tcmu_cmd { #define TCMU_CMD_BIT_EXPIRED 0 unsigned long flags; }; + +/* + * I-T nexus for SCSI2 (RESERVE/RELEASE) reservation. + */ +struct tcmu_scsi2_rsv { + char it_nexus[TCMU_PR_IT_NEXUS_MAXLEN]; + }; + /* * To avoid dead lock the mutex lock order should always be: * @@ -1875,6 +1886,60 @@ tcmu_pr_info_vers_decode(char *str, u32 *vers) return 0; } +static int +tcmu_pr_info_scsi2_rsv_decode(char *str, struct tcmu_scsi2_rsv **_scsi2_rsv) +{ + struct tcmu_scsi2_rsv *scsi2_rsv; + + if (!_scsi2_rsv) { + WARN_ON(1); + return -EINVAL; + } + if (!strncmp(str, TCMU_PR_INFO_XATTR_VAL_SCSI2_RSV_ABSENT, + sizeof(TCMU_PR_INFO_XATTR_VAL_SCSI2_RSV_ABSENT))) { + scsi2_rsv = NULL; + } else { + size_t n; + + scsi2_rsv = kzalloc(sizeof(*scsi2_rsv), GFP_KERNEL); + if (!scsi2_rsv) + return -ENOMEM; + + n = strlcpy(scsi2_rsv->it_nexus, str, + TCMU_PR_IT_NEXUS_MAXLEN); + if (n >= TCMU_PR_IT_NEXUS_MAXLEN) { + kfree(scsi2_rsv); + return -EINVAL; + } + } + + pr_debug("processed pr_info SCSI2 rsv: %s\n", str); + + *_scsi2_rsv = scsi2_rsv; + return 0; +} + +static int +tcmu_pr_info_scsi2_rsv_encode(char *buf, size_t buf_remain, + struct tcmu_scsi2_rsv *scsi2_rsv) +{ + int rc; + + if (!scsi2_rsv) { + /* no reservation */ + rc = snprintf(buf, buf_remain, "%s\n", + TCMU_PR_INFO_XATTR_VAL_SCSI2_RSV_ABSENT); + } else { + rc = snprintf(buf, buf_remain, "%s\n", scsi2_rsv->it_nexus); + } + if ((rc < 0) || (rc >= buf_remain)) { + pr_err("failed to encode SCSI2 reservation\n"); + return -EINVAL; + } + + 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