target: simplify reservations code

We do not support host-level reservations for the pscsi backend, and all
virtual backends are newere than SCSI-2, so just make the combined
SPC-3 + SCSI-2 support the only supported variant and kill the switches
for the different implementations, given that this code handles the no-op
version just fine.

(hch: Update DRF_SPC2_RESERVATIONS lock usage)

Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 29 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 15af1307d064..892a93dec19c 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -93,8 +93,6 @@
  */
 #define DA_EMULATE_TPWS                         0
 /* No Emulation for PSCSI by default */
-#define DA_EMULATE_RESERVATIONS                 0
-/* No Emulation for PSCSI by default */
 #define DA_EMULATE_ALUA                         0
 /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
 #define DA_ENFORCE_PR_ISIDS                     1
@@ -333,18 +331,6 @@ struct t10_wwn {
         struct list_head t10_vpd_list;
 };
 
-
-/*
- * Used by TCM Core internally to signal if >= SPC-3 persistent reservations
- * emulation is enabled or disabled, or running in with TCM/pSCSI passthrough
- * mode
- */
-typedef enum {
-        SPC_PASSTHROUGH,
-        SPC2_RESERVATIONS,
-        SPC3_PERSISTENT_RESERVATIONS
-} t10_reservations_index_t;
-
 struct t10_pr_registration {
         /* Used for fabrics that contain WWN+ISID */
 #define PR_REG_ISID_LEN                         16
@@ -386,18 +372,6 @@ struct t10_pr_registration {
         struct list_head pr_reg_atp_mem_list;
 };
 
-/*
- * This set of function pointer ops is set based upon SPC3_PERSISTENT_RESERVATIONS,
- * SPC2_RESERVATIONS or SPC_PASSTHROUGH in drivers/target/target_core_pr.c:
- * core_setup_reservations()
- */
-struct t10_reservation_ops {
-        int (*t10_reservation_check)(struct se_cmd *, u32 *);
-        int (*t10_seq_non_holder)(struct se_cmd *, unsigned char *, u32);
-        int (*t10_pr_register)(struct se_cmd *);
-        int (*t10_pr_clear)(struct se_cmd *);
-};
-
 struct t10_reservation {
         /* Reservation effects all target ports */
         int pr_all_tg_pt;
@@ -408,7 +382,6 @@ struct t10_reservation {
 #define PR_APTPL_BUF_LEN                        8192
         u32 pr_aptpl_buf_len;
         u32 pr_generation;
-        t10_reservations_index_t res_type;
         spinlock_t registration_lock;
         spinlock_t aptpl_reg_lock;
         /*
@@ -424,7 +397,6 @@ struct t10_reservation {
         struct se_node_acl *pr_res_holder;
         struct list_head registration_list;
         struct list_head aptpl_reg_list;
-        struct t10_reservation_ops pr_ops;
 };
 
 struct se_tmr_req {
@@ -633,7 +605,6 @@ struct se_dev_attrib {
         int             emulate_tas;
         int             emulate_tpu;
         int             emulate_tpws;
-        int             emulate_reservations;
         int             emulate_alua;
         int             enforce_pr_isids;
         int             is_nonrot;