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target: simplify reservations code

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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>
This commit is contained in:
Christoph Hellwig
2012-10-10 17:37:15 -04:00
committed by Nicholas Bellinger
parent 019c4ca621
commit d977f4377f
7 changed files with 128 additions and 299 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/target/target_core_base.h
-29
View File
@@ -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;