This patch added a struct target_pr_ops contains TCMU Persistent Reservation operation functions. Added a "struct target_pr_ops" type pointer in target_backend_ops, so that we can call TCMU PR functions from struct target_backend_ops.
Signed-off-by: Zhu Lingshan <[email protected]> --- drivers/target/target_core_user.c | 6 +++++ include/target/target_core_backend.h | 36 ++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 09a341e935a9..ea3685106d35 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -3701,6 +3701,11 @@ static struct configfs_attribute *tcmu_action_attrs[] = { NULL, }; +static struct target_pr_ops tcmu_pr_ops = { + .pr_read_keys = tcmu_execute_pr_read_keys, + .pr_register = tcmu_execute_pr_register, +}; + static struct target_backend_ops tcmu_ops = { .name = "user", .owner = THIS_MODULE, @@ -3717,6 +3722,7 @@ static struct target_backend_ops tcmu_ops = { .get_device_type = sbc_get_device_type, .get_blocks = tcmu_get_blocks, .tb_dev_action_attrs = tcmu_action_attrs, + .pr_ops = &tcmu_pr_ops, }; static void find_free_blocks(void) diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index 34a15d59ed88..36a820429cf4 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -51,11 +51,47 @@ struct target_backend_ops { int (*init_prot)(struct se_device *); int (*format_prot)(struct se_device *); void (*free_prot)(struct se_device *); + struct target_pr_ops *pr_ops; struct configfs_attribute **tb_dev_attrib_attrs; struct configfs_attribute **tb_dev_action_attrs; }; +enum target_pr_check_type { + /* check for *any* SCSI2 reservations, including own */ + TARGET_PR_CHECK_SCSI2_ANY, + /* check for conflicting SCSI2 or SCSI3 reservation */ + TARGET_PR_CHECK_SCSI2_SCSI3, +}; + +struct target_pr_ops { + sense_reason_t (*check_conflict)(struct se_cmd *cmd, + enum target_pr_check_type); + sense_reason_t (*scsi2_reserve)(struct se_cmd *cmd); + sense_reason_t (*scsi2_release)(struct se_cmd *cmd); + sense_reason_t (*reset)(struct se_device *dev); + sense_reason_t (*pr_register)(struct se_cmd *cmd, u64 old_key, + u64 new_key, bool aptpl, bool all_tg_pt, + bool spec_i_pt, bool ignore_existing); + sense_reason_t (*pr_reserve)(struct se_cmd *cmd, int type, u64 key); + sense_reason_t (*pr_release)(struct se_cmd *cmd, int type, u64 key); + sense_reason_t (*pr_clear)(struct se_cmd *cmd, u64 key); + sense_reason_t (*pr_preempt)(struct se_cmd *cmd, u64 old_key, + u64 new_key, int type, bool abort); + sense_reason_t (*pr_register_and_move)(struct se_cmd *cmd, u64 old_key, + u64 new_key, bool aptpl, + int unreg); + sense_reason_t (*pr_read_keys)(struct se_cmd *cmd, unsigned char *buf, + u32 buf_len); + sense_reason_t (*pr_read_reservation)(struct se_cmd *cmd, + unsigned char *buf, u32 buf_len); + sense_reason_t (*pr_report_capabilities)(struct se_cmd *cmd, + unsigned char *buf, + u32 buf_len); + sense_reason_t (*pr_read_full_status)(struct se_cmd *cmd, + unsigned char *buf, u32 buf_len); +}; + struct sbc_ops { sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *, u32, enum dma_data_direction); -- 2.17.1
