drivers/target/target_core_pr.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*******************************************************************************
0003  * Filename:  target_core_pr.c
0004  *
0005  * This file contains SPC-3 compliant persistent reservations and
0006  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
0007  *
0008  * (c) Copyright 2009-2013 Datera, Inc.
0009  *
0010  * Nicholas A. Bellinger <nab@kernel.org>
0011  *
0012  ******************************************************************************/
0013
0014 #include <linux/slab.h>
0015 #include <linux/spinlock.h>
0016 #include <linux/list.h>
0017 #include <linux/vmalloc.h>
0018 #include <linux/file.h>
0019 #include <linux/fcntl.h>
0020 #include <linux/fs.h>
0021 #include <scsi/scsi_proto.h>
0022 #include <asm/unaligned.h>
0023
0024 #include <target/target_core_base.h>
0025 #include <target/target_core_backend.h>
0026 #include <target/target_core_fabric.h>
0027
0028 #include "target_core_internal.h"
0029 #include "target_core_pr.h"
0030 #include "target_core_ua.h"
0031
0032 /*
0033  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
0034  */
0035 struct pr_transport_id_holder {
0036     struct t10_pr_registration *dest_pr_reg;
0037     struct se_portal_group *dest_tpg;
0038     struct se_node_acl *dest_node_acl;
0039     struct se_dev_entry *dest_se_deve;
0040     struct list_head dest_list;
0041 };
0042
0043 void core_pr_dump_initiator_port(
0044     struct t10_pr_registration *pr_reg,
0045     char *buf,
0046     u32 size)
0047 {
0048     if (!pr_reg->isid_present_at_reg) {
0049         buf[0] = '\0';
0050         return;
0051     }
0052
0053     snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
0054 }
0055
0056 enum register_type {
0057     REGISTER,
0058     REGISTER_AND_IGNORE_EXISTING_KEY,
0059     REGISTER_AND_MOVE,
0060 };
0061
0062 enum preempt_type {
0063     PREEMPT,
0064     PREEMPT_AND_ABORT,
0065 };
0066
0067 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
0068                           struct t10_pr_registration *, int, int);
0069
0070 static int is_reservation_holder(
0071     struct t10_pr_registration *pr_res_holder,
0072     struct t10_pr_registration *pr_reg)
0073 {
0074     int pr_res_type;
0075
0076     if (pr_res_holder) {
0077         pr_res_type = pr_res_holder->pr_res_type;
0078
0079         return pr_res_holder == pr_reg ||
0080                pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
0081                pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
0082     }
0083     return 0;
0084 }
0085
0086 static sense_reason_t
0087 target_scsi2_reservation_check(struct se_cmd *cmd)
0088 {
0089     struct se_device *dev = cmd->se_dev;
0090     struct se_session *sess = cmd->se_sess;
0091
0092     switch (cmd->t_task_cdb[0]) {
0093     case INQUIRY:
0094     case RELEASE:
0095     case RELEASE_10:
0096         return 0;
0097     default:
0098         break;
0099     }
0100
0101     if (!dev->reservation_holder || !sess)
0102         return 0;
0103
0104     if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
0105         return TCM_RESERVATION_CONFLICT;
0106
0107     if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
0108         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
0109             return TCM_RESERVATION_CONFLICT;
0110     }
0111
0112     return 0;
0113 }
0114
0115 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
0116                     struct se_node_acl *, struct se_session *);
0117 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
0118
0119 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
0120 {
0121     struct se_session *se_sess = cmd->se_sess;
0122     struct se_device *dev = cmd->se_dev;
0123     struct t10_pr_registration *pr_reg;
0124     struct t10_reservation *pr_tmpl = &dev->t10_pr;
0125     int conflict = 0;
0126
0127     pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
0128             se_sess);
0129     if (pr_reg) {
0130         /*
0131          * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
0132          * behavior
0133          *
0134          * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
0135          * status, but no reservation shall be established and the
0136          * persistent reservation shall not be changed, if the command
0137          * is received from a) and b) below.
0138          *
0139          * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
0140          * status, but the persistent reservation shall not be released,
0141          * if the command is received from a) and b)
0142          *
0143          * a) An I_T nexus that is a persistent reservation holder; or
0144          * b) An I_T nexus that is registered if a registrants only or
0145          *    all registrants type persistent reservation is present.
0146          *
0147          * In all other cases, a RESERVE(6) command, RESERVE(10) command,
0148          * RELEASE(6) command, or RELEASE(10) command shall be processed
0149          * as defined in SPC-2.
0150          */
0151         if (pr_reg->pr_res_holder) {
0152             core_scsi3_put_pr_reg(pr_reg);
0153             return 1;
0154         }
0155         if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
0156             (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
0157             (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
0158             (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
0159             core_scsi3_put_pr_reg(pr_reg);
0160             return 1;
0161         }
0162         core_scsi3_put_pr_reg(pr_reg);
0163         conflict = 1;
0164     } else {
0165         /*
0166          * Following spc2r20 5.5.1 Reservations overview:
0167          *
0168          * If a logical unit has executed a PERSISTENT RESERVE OUT
0169          * command with the REGISTER or the REGISTER AND IGNORE
0170          * EXISTING KEY service action and is still registered by any
0171          * initiator, all RESERVE commands and all RELEASE commands
0172          * regardless of initiator shall conflict and shall terminate
0173          * with a RESERVATION CONFLICT status.
0174          */
0175         spin_lock(&pr_tmpl->registration_lock);
0176         conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
0177         spin_unlock(&pr_tmpl->registration_lock);
0178     }
0179
0180     if (conflict) {
0181         pr_err("Received legacy SPC-2 RESERVE/RELEASE"
0182             " while active SPC-3 registrations exist,"
0183             " returning RESERVATION_CONFLICT\n");
0184         return -EBUSY;
0185     }
0186
0187     return 0;
0188 }
0189
0190 void target_release_reservation(struct se_device *dev)
0191 {
0192     dev->reservation_holder = NULL;
0193     dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
0194     if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
0195         dev->dev_res_bin_isid = 0;
0196         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
0197     }
0198 }
0199
0200 sense_reason_t
0201 target_scsi2_reservation_release(struct se_cmd *cmd)
0202 {
0203     struct se_device *dev = cmd->se_dev;
0204     struct se_session *sess = cmd->se_sess;
0205     struct se_portal_group *tpg;
0206     int rc;
0207
0208     if (!sess || !sess->se_tpg)
0209         goto out;
0210     rc = target_check_scsi2_reservation_conflict(cmd);
0211     if (rc == 1)
0212         goto out;
0213     if (rc < 0)
0214         return TCM_RESERVATION_CONFLICT;
0215
0216     spin_lock(&dev->dev_reservation_lock);
0217     if (!dev->reservation_holder || !sess)
0218         goto out_unlock;
0219
0220     if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
0221         goto out_unlock;
0222
0223     if (dev->dev_res_bin_isid != sess->sess_bin_isid)
0224         goto out_unlock;
0225
0226     target_release_reservation(dev);
0227     tpg = sess->se_tpg;
0228     pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
0229         " MAPPED LUN: %llu for %s\n",
0230         tpg->se_tpg_tfo->fabric_name,
0231         cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
0232         sess->se_node_acl->initiatorname);
0233
0234 out_unlock:
0235     spin_unlock(&dev->dev_reservation_lock);
0236 out:
0237     target_complete_cmd(cmd, SAM_STAT_GOOD);
0238     return 0;
0239 }
0240
0241 sense_reason_t
0242 target_scsi2_reservation_reserve(struct se_cmd *cmd)
0243 {
0244     struct se_device *dev = cmd->se_dev;
0245     struct se_session *sess = cmd->se_sess;
0246     struct se_portal_group *tpg;
0247     sense_reason_t ret = 0;
0248     int rc;
0249
0250     if ((cmd->t_task_cdb[1] & 0x01) &&
0251         (cmd->t_task_cdb[1] & 0x02)) {
0252         pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
0253         return TCM_UNSUPPORTED_SCSI_OPCODE;
0254     }
0255     /*
0256      * This is currently the case for target_core_mod passthrough struct se_cmd
0257      * ops
0258      */
0259     if (!sess || !sess->se_tpg)
0260         goto out;
0261     rc = target_check_scsi2_reservation_conflict(cmd);
0262     if (rc == 1)
0263         goto out;
0264
0265     if (rc < 0)
0266         return TCM_RESERVATION_CONFLICT;
0267
0268     tpg = sess->se_tpg;
0269     spin_lock(&dev->dev_reservation_lock);
0270     if (dev->reservation_holder &&
0271         dev->reservation_holder->se_node_acl != sess->se_node_acl) {
0272         pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n",
0273             tpg->se_tpg_tfo->fabric_name);
0274         pr_err("Original reserver LUN: %llu %s\n",
0275             cmd->se_lun->unpacked_lun,
0276             dev->reservation_holder->se_node_acl->initiatorname);
0277         pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
0278             " from %s \n", cmd->se_lun->unpacked_lun,
0279             cmd->orig_fe_lun,
0280             sess->se_node_acl->initiatorname);
0281         ret = TCM_RESERVATION_CONFLICT;
0282         goto out_unlock;
0283     }
0284
0285     dev->reservation_holder = sess;
0286     dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
0287     if (sess->sess_bin_isid != 0) {
0288         dev->dev_res_bin_isid = sess->sess_bin_isid;
0289         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
0290     }
0291     pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
0292         " for %s\n", tpg->se_tpg_tfo->fabric_name,
0293         cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
0294         sess->se_node_acl->initiatorname);
0295
0296 out_unlock:
0297     spin_unlock(&dev->dev_reservation_lock);
0298 out:
0299     if (!ret)
0300         target_complete_cmd(cmd, SAM_STAT_GOOD);
0301     return ret;
0302 }
0303
0304
0305 /*
0306  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
0307  *
0308  * This function is called by those initiator ports who are *NOT*
0309  * the active PR reservation holder when a reservation is present.
0310  */
0311 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
0312                     bool isid_mismatch)
0313 {
0314     unsigned char *cdb = cmd->t_task_cdb;
0315     struct se_session *se_sess = cmd->se_sess;
0316     struct se_node_acl *nacl = se_sess->se_node_acl;
0317     int other_cdb = 0;
0318     int registered_nexus = 0, ret = 1; /* Conflict by default */
0319     int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
0320     int we = 0; /* Write Exclusive */
0321     int legacy = 0; /* Act like a legacy device and return
0322              * RESERVATION CONFLICT on some CDBs */
0323
0324     if (isid_mismatch) {
0325         registered_nexus = 0;
0326     } else {
0327         struct se_dev_entry *se_deve;
0328
0329         rcu_read_lock();
0330         se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
0331         if (se_deve)
0332             registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
0333                             &se_deve->deve_flags);
0334         rcu_read_unlock();
0335     }
0336
0337     switch (pr_reg_type) {
0338     case PR_TYPE_WRITE_EXCLUSIVE:
0339         we = 1;
0340         fallthrough;
0341     case PR_TYPE_EXCLUSIVE_ACCESS:
0342         /*
0343          * Some commands are only allowed for the persistent reservation
0344          * holder.
0345          */
0346         break;
0347     case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
0348         we = 1;
0349         fallthrough;
0350     case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
0351         /*
0352          * Some commands are only allowed for registered I_T Nexuses.
0353          */
0354         reg_only = 1;
0355         break;
0356     case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
0357         we = 1;
0358         fallthrough;
0359     case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
0360         /*
0361          * Each registered I_T Nexus is a reservation holder.
0362          */
0363         all_reg = 1;
0364         break;
0365     default:
0366         return -EINVAL;
0367     }
0368     /*
0369      * Referenced from spc4r17 table 45 for *NON* PR holder access
0370      */
0371     switch (cdb[0]) {
0372     case SECURITY_PROTOCOL_IN:
0373         if (registered_nexus)
0374             return 0;
0375         ret = (we) ? 0 : 1;
0376         break;
0377     case MODE_SENSE:
0378     case MODE_SENSE_10:
0379     case READ_ATTRIBUTE:
0380     case READ_BUFFER:
0381     case RECEIVE_DIAGNOSTIC:
0382         if (legacy) {
0383             ret = 1;
0384             break;
0385         }
0386         if (registered_nexus) {
0387             ret = 0;
0388             break;
0389         }
0390         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
0391         break;
0392     case PERSISTENT_RESERVE_OUT:
0393         /*
0394          * This follows PERSISTENT_RESERVE_OUT service actions that
0395          * are allowed in the presence of various reservations.
0396          * See spc4r17, table 46
0397          */
0398         switch (cdb[1] & 0x1f) {
0399         case PRO_CLEAR:
0400         case PRO_PREEMPT:
0401         case PRO_PREEMPT_AND_ABORT:
0402             ret = (registered_nexus) ? 0 : 1;
0403             break;
0404         case PRO_REGISTER:
0405         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
0406             ret = 0;
0407             break;
0408         case PRO_REGISTER_AND_MOVE:
0409         case PRO_RESERVE:
0410             ret = 1;
0411             break;
0412         case PRO_RELEASE:
0413             ret = (registered_nexus) ? 0 : 1;
0414             break;
0415         default:
0416             pr_err("Unknown PERSISTENT_RESERVE_OUT service"
0417                 " action: 0x%02x\n", cdb[1] & 0x1f);
0418             return -EINVAL;
0419         }
0420         break;
0421     case RELEASE:
0422     case RELEASE_10:
0423         /* Handled by CRH=1 in target_scsi2_reservation_release() */
0424         ret = 0;
0425         break;
0426     case RESERVE:
0427     case RESERVE_10:
0428         /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
0429         ret = 0;
0430         break;
0431     case TEST_UNIT_READY:
0432         ret = (legacy) ? 1 : 0; /* Conflict for legacy */
0433         break;
0434     case MAINTENANCE_IN:
0435         switch (cdb[1] & 0x1f) {
0436         case MI_MANAGEMENT_PROTOCOL_IN:
0437             if (registered_nexus) {
0438                 ret = 0;
0439                 break;
0440             }
0441             ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
0442             break;
0443         case MI_REPORT_SUPPORTED_OPERATION_CODES:
0444         case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
0445             if (legacy) {
0446                 ret = 1;
0447                 break;
0448             }
0449             if (registered_nexus) {
0450                 ret = 0;
0451                 break;
0452             }
0453             ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
0454             break;
0455         case MI_REPORT_ALIASES:
0456         case MI_REPORT_IDENTIFYING_INFORMATION:
0457         case MI_REPORT_PRIORITY:
0458         case MI_REPORT_TARGET_PGS:
0459         case MI_REPORT_TIMESTAMP:
0460             ret = 0; /* Allowed */
0461             break;
0462         default:
0463             pr_err("Unknown MI Service Action: 0x%02x\n",
0464                 (cdb[1] & 0x1f));
0465             return -EINVAL;
0466         }
0467         break;
0468     case ACCESS_CONTROL_IN:
0469     case ACCESS_CONTROL_OUT:
0470     case INQUIRY:
0471     case LOG_SENSE:
0472     case SERVICE_ACTION_IN_12:
0473     case REPORT_LUNS:
0474     case REQUEST_SENSE:
0475     case PERSISTENT_RESERVE_IN:
0476         ret = 0; /*/ Allowed CDBs */
0477         break;
0478     default:
0479         other_cdb = 1;
0480         break;
0481     }
0482     /*
0483      * Case where the CDB is explicitly allowed in the above switch
0484      * statement.
0485      */
0486     if (!ret && !other_cdb) {
0487         pr_debug("Allowing explicit CDB: 0x%02x for %s"
0488             " reservation holder\n", cdb[0],
0489             core_scsi3_pr_dump_type(pr_reg_type));
0490
0491         return ret;
0492     }
0493     /*
0494      * Check if write exclusive initiator ports *NOT* holding the
0495      * WRITE_EXCLUSIVE_* reservation.
0496      */
0497     if (we && !registered_nexus) {
0498         if (cmd->data_direction == DMA_TO_DEVICE) {
0499             /*
0500              * Conflict for write exclusive
0501              */
0502             pr_debug("%s Conflict for unregistered nexus"
0503                 " %s CDB: 0x%02x to %s reservation\n",
0504                 transport_dump_cmd_direction(cmd),
0505                 se_sess->se_node_acl->initiatorname, cdb[0],
0506                 core_scsi3_pr_dump_type(pr_reg_type));
0507             return 1;
0508         } else {
0509             /*
0510              * Allow non WRITE CDBs for all Write Exclusive
0511              * PR TYPEs to pass for registered and
0512              * non-registered_nexuxes NOT holding the reservation.
0513              *
0514              * We only make noise for the unregisterd nexuses,
0515              * as we expect registered non-reservation holding
0516              * nexuses to issue CDBs.
0517              */
0518
0519             if (!registered_nexus) {
0520                 pr_debug("Allowing implicit CDB: 0x%02x"
0521                     " for %s reservation on unregistered"
0522                     " nexus\n", cdb[0],
0523                     core_scsi3_pr_dump_type(pr_reg_type));
0524             }
0525
0526             return 0;
0527         }
0528     } else if ((reg_only) || (all_reg)) {
0529         if (registered_nexus) {
0530             /*
0531              * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
0532              * allow commands from registered nexuses.
0533              */
0534
0535             pr_debug("Allowing implicit CDB: 0x%02x for %s"
0536                 " reservation\n", cdb[0],
0537                 core_scsi3_pr_dump_type(pr_reg_type));
0538
0539             return 0;
0540         }
0541        } else if (we && registered_nexus) {
0542                /*
0543                 * Reads are allowed for Write Exclusive locks
0544                 * from all registrants.
0545                 */
0546                if (cmd->data_direction == DMA_FROM_DEVICE) {
0547                        pr_debug("Allowing READ CDB: 0x%02x for %s"
0548                                " reservation\n", cdb[0],
0549                                core_scsi3_pr_dump_type(pr_reg_type));
0550
0551                        return 0;
0552                }
0553     }
0554     pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
0555         " for %s reservation\n", transport_dump_cmd_direction(cmd),
0556         (registered_nexus) ? "" : "un",
0557         se_sess->se_node_acl->initiatorname, cdb[0],
0558         core_scsi3_pr_dump_type(pr_reg_type));
0559
0560     return 1; /* Conflict by default */
0561 }
0562
0563 static sense_reason_t
0564 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
0565 {
0566     struct se_device *dev = cmd->se_dev;
0567     struct se_session *sess = cmd->se_sess;
0568     u32 pr_reg_type;
0569     bool isid_mismatch = false;
0570
0571     if (!dev->dev_pr_res_holder)
0572         return 0;
0573
0574     pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
0575     cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
0576     if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
0577         goto check_nonholder;
0578
0579     if (dev->dev_pr_res_holder->isid_present_at_reg) {
0580         if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
0581             sess->sess_bin_isid) {
0582             isid_mismatch = true;
0583             goto check_nonholder;
0584         }
0585     }
0586
0587     return 0;
0588
0589 check_nonholder:
0590     if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
0591         return TCM_RESERVATION_CONFLICT;
0592     return 0;
0593 }
0594
0595 static u32 core_scsi3_pr_generation(struct se_device *dev)
0596 {
0597     u32 prg;
0598
0599     /*
0600      * PRGeneration field shall contain the value of a 32-bit wrapping
0601      * counter mainted by the device server.
0602      *
0603      * Note that this is done regardless of Active Persist across
0604      * Target PowerLoss (APTPL)
0605      *
0606      * See spc4r17 section 6.3.12 READ_KEYS service action
0607      */
0608     spin_lock(&dev->dev_reservation_lock);
0609     prg = dev->t10_pr.pr_generation++;
0610     spin_unlock(&dev->dev_reservation_lock);
0611
0612     return prg;
0613 }
0614
0615 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
0616     struct se_device *dev,
0617     struct se_node_acl *nacl,
0618     struct se_lun *lun,
0619     struct se_dev_entry *dest_deve,
0620     u64 mapped_lun,
0621     unsigned char *isid,
0622     u64 sa_res_key,
0623     int all_tg_pt,
0624     int aptpl)
0625 {
0626     struct t10_pr_registration *pr_reg;
0627
0628     pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
0629     if (!pr_reg) {
0630         pr_err("Unable to allocate struct t10_pr_registration\n");
0631         return NULL;
0632     }
0633
0634     INIT_LIST_HEAD(&pr_reg->pr_reg_list);
0635     INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
0636     INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
0637     INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
0638     INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
0639     atomic_set(&pr_reg->pr_res_holders, 0);
0640     pr_reg->pr_reg_nacl = nacl;
0641     /*
0642      * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
0643      * the se_dev_entry->pr_ref will have been already obtained by
0644      * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
0645      *
0646      * Otherwise, locate se_dev_entry now and obtain a reference until
0647      * registration completes in __core_scsi3_add_registration().
0648      */
0649     if (dest_deve) {
0650         pr_reg->pr_reg_deve = dest_deve;
0651     } else {
0652         rcu_read_lock();
0653         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
0654         if (!pr_reg->pr_reg_deve) {
0655             rcu_read_unlock();
0656             pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
0657                 nacl->initiatorname, mapped_lun);
0658             kmem_cache_free(t10_pr_reg_cache, pr_reg);
0659             return NULL;
0660         }
0661         kref_get(&pr_reg->pr_reg_deve->pr_kref);
0662         rcu_read_unlock();
0663     }
0664     pr_reg->pr_res_mapped_lun = mapped_lun;
0665     pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
0666     pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
0667     pr_reg->pr_res_key = sa_res_key;
0668     pr_reg->pr_reg_all_tg_pt = all_tg_pt;
0669     pr_reg->pr_reg_aptpl = aptpl;
0670     /*
0671      * If an ISID value for this SCSI Initiator Port exists,
0672      * save it to the registration now.
0673      */
0674     if (isid != NULL) {
0675         pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
0676         snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
0677         pr_reg->isid_present_at_reg = 1;
0678     }
0679
0680     return pr_reg;
0681 }
0682
0683 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
0684 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
0685
0686 /*
0687  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
0688  * modes.
0689  */
0690 static struct t10_pr_registration *__core_scsi3_alloc_registration(
0691     struct se_device *dev,
0692     struct se_node_acl *nacl,
0693     struct se_lun *lun,
0694     struct se_dev_entry *deve,
0695     u64 mapped_lun,
0696     unsigned char *isid,
0697     u64 sa_res_key,
0698     int all_tg_pt,
0699     int aptpl)
0700 {
0701     struct se_dev_entry *deve_tmp;
0702     struct se_node_acl *nacl_tmp;
0703     struct se_lun_acl *lacl_tmp;
0704     struct se_lun *lun_tmp, *next, *dest_lun;
0705     const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
0706     struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
0707     int ret;
0708     /*
0709      * Create a registration for the I_T Nexus upon which the
0710      * PROUT REGISTER was received.
0711      */
0712     pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
0713                             isid, sa_res_key, all_tg_pt,
0714                             aptpl);
0715     if (!pr_reg)
0716         return NULL;
0717     /*
0718      * Return pointer to pr_reg for ALL_TG_PT=0
0719      */
0720     if (!all_tg_pt)
0721         return pr_reg;
0722     /*
0723      * Create list of matching SCSI Initiator Port registrations
0724      * for ALL_TG_PT=1
0725      */
0726     spin_lock(&dev->se_port_lock);
0727     list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
0728         if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
0729             continue;
0730         spin_unlock(&dev->se_port_lock);
0731
0732         spin_lock(&lun_tmp->lun_deve_lock);
0733         list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
0734             /*
0735              * This pointer will be NULL for demo mode MappedLUNs
0736              * that have not been make explicit via a ConfigFS
0737              * MappedLUN group for the SCSI Initiator Node ACL.
0738              */
0739             if (!deve_tmp->se_lun_acl)
0740                 continue;
0741
0742             lacl_tmp = deve_tmp->se_lun_acl;
0743             nacl_tmp = lacl_tmp->se_lun_nacl;
0744             /*
0745              * Skip the matching struct se_node_acl that is allocated
0746              * above..
0747              */
0748             if (nacl == nacl_tmp)
0749                 continue;
0750             /*
0751              * Only perform PR registrations for target ports on
0752              * the same fabric module as the REGISTER w/ ALL_TG_PT=1
0753              * arrived.
0754              */
0755             if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
0756                 continue;
0757             /*
0758              * Look for a matching Initiator Node ACL in ASCII format
0759              */
0760             if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
0761                 continue;
0762
0763             kref_get(&deve_tmp->pr_kref);
0764             spin_unlock(&lun_tmp->lun_deve_lock);
0765             /*
0766              * Grab a configfs group dependency that is released
0767              * for the exception path at label out: below, or upon
0768              * completion of adding ALL_TG_PT=1 registrations in
0769              * __core_scsi3_add_registration()
0770              */
0771             ret = core_scsi3_lunacl_depend_item(deve_tmp);
0772             if (ret < 0) {
0773                 pr_err("core_scsi3_lunacl_depend"
0774                         "_item() failed\n");
0775                 percpu_ref_put(&lun_tmp->lun_ref);
0776                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
0777                 goto out;
0778             }
0779             /*
0780              * Located a matching SCSI Initiator Port on a different
0781              * port, allocate the pr_reg_atp and attach it to the
0782              * pr_reg->pr_reg_atp_list that will be processed once
0783              * the original *pr_reg is processed in
0784              * __core_scsi3_add_registration()
0785              */
0786             dest_lun = deve_tmp->se_lun;
0787
0788             pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
0789                         nacl_tmp, dest_lun, deve_tmp,
0790                         deve_tmp->mapped_lun, NULL,
0791                         sa_res_key, all_tg_pt, aptpl);
0792             if (!pr_reg_atp) {
0793                 percpu_ref_put(&lun_tmp->lun_ref);
0794                 core_scsi3_lunacl_undepend_item(deve_tmp);
0795                 goto out;
0796             }
0797
0798             list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
0799                       &pr_reg->pr_reg_atp_list);
0800             spin_lock(&lun_tmp->lun_deve_lock);
0801         }
0802         spin_unlock(&lun_tmp->lun_deve_lock);
0803
0804         spin_lock(&dev->se_port_lock);
0805         percpu_ref_put(&lun_tmp->lun_ref);
0806     }
0807     spin_unlock(&dev->se_port_lock);
0808
0809     return pr_reg;
0810 out:
0811     list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
0812             &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
0813         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
0814         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
0815         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
0816     }
0817     kmem_cache_free(t10_pr_reg_cache, pr_reg);
0818     return NULL;
0819 }
0820
0821 int core_scsi3_alloc_aptpl_registration(
0822     struct t10_reservation *pr_tmpl,
0823     u64 sa_res_key,
0824     unsigned char *i_port,
0825     unsigned char *isid,
0826     u64 mapped_lun,
0827     unsigned char *t_port,
0828     u16 tpgt,
0829     u64 target_lun,
0830     int res_holder,
0831     int all_tg_pt,
0832     u8 type)
0833 {
0834     struct t10_pr_registration *pr_reg;
0835
0836     if (!i_port || !t_port || !sa_res_key) {
0837         pr_err("Illegal parameters for APTPL registration\n");
0838         return -EINVAL;
0839     }
0840
0841     pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
0842     if (!pr_reg) {
0843         pr_err("Unable to allocate struct t10_pr_registration\n");
0844         return -ENOMEM;
0845     }
0846
0847     INIT_LIST_HEAD(&pr_reg->pr_reg_list);
0848     INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
0849     INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
0850     INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
0851     INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
0852     atomic_set(&pr_reg->pr_res_holders, 0);
0853     pr_reg->pr_reg_nacl = NULL;
0854     pr_reg->pr_reg_deve = NULL;
0855     pr_reg->pr_res_mapped_lun = mapped_lun;
0856     pr_reg->pr_aptpl_target_lun = target_lun;
0857     pr_reg->pr_res_key = sa_res_key;
0858     pr_reg->pr_reg_all_tg_pt = all_tg_pt;
0859     pr_reg->pr_reg_aptpl = 1;
0860     pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
0861     pr_reg->pr_res_type = type;
0862     /*
0863      * If an ISID value had been saved in APTPL metadata for this
0864      * SCSI Initiator Port, restore it now.
0865      */
0866     if (isid != NULL) {
0867         pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
0868         snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
0869         pr_reg->isid_present_at_reg = 1;
0870     }
0871     /*
0872      * Copy the i_port and t_port information from caller.
0873      */
0874     snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
0875     snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
0876     pr_reg->pr_reg_tpgt = tpgt;
0877     /*
0878      * Set pr_res_holder from caller, the pr_reg who is the reservation
0879      * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
0880      * the Initiator Node LUN ACL from the fabric module is created for
0881      * this registration.
0882      */
0883     pr_reg->pr_res_holder = res_holder;
0884
0885     list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
0886     pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
0887             " metadata\n", (res_holder) ? "+reservation" : "");
0888     return 0;
0889 }
0890
0891 static void core_scsi3_aptpl_reserve(
0892     struct se_device *dev,
0893     struct se_portal_group *tpg,
0894     struct se_node_acl *node_acl,
0895     struct t10_pr_registration *pr_reg)
0896 {
0897     char i_buf[PR_REG_ISID_ID_LEN] = { };
0898
0899     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
0900
0901     spin_lock(&dev->dev_reservation_lock);
0902     dev->dev_pr_res_holder = pr_reg;
0903     spin_unlock(&dev->dev_reservation_lock);
0904
0905     pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
0906         " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
0907         tpg->se_tpg_tfo->fabric_name,
0908         core_scsi3_pr_dump_type(pr_reg->pr_res_type),
0909         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
0910     pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
0911         tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname,
0912         i_buf);
0913 }
0914
0915 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
0916                 struct t10_pr_registration *, enum register_type, int);
0917
0918 static int __core_scsi3_check_aptpl_registration(
0919     struct se_device *dev,
0920     struct se_portal_group *tpg,
0921     struct se_lun *lun,
0922     u64 target_lun,
0923     struct se_node_acl *nacl,
0924     u64 mapped_lun)
0925 {
0926     struct t10_pr_registration *pr_reg, *pr_reg_tmp;
0927     struct t10_reservation *pr_tmpl = &dev->t10_pr;
0928     unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };
0929     unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };
0930     u16 tpgt;
0931
0932     /*
0933      * Copy Initiator Port information from struct se_node_acl
0934      */
0935     snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
0936     snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
0937             tpg->se_tpg_tfo->tpg_get_wwn(tpg));
0938     tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
0939     /*
0940      * Look for the matching registrations+reservation from those
0941      * created from APTPL metadata.  Note that multiple registrations
0942      * may exist for fabrics that use ISIDs in their SCSI Initiator Port
0943      * TransportIDs.
0944      */
0945     spin_lock(&pr_tmpl->aptpl_reg_lock);
0946     list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
0947                 pr_reg_aptpl_list) {
0948
0949         if (!strcmp(pr_reg->pr_iport, i_port) &&
0950              (pr_reg->pr_res_mapped_lun == mapped_lun) &&
0951             !(strcmp(pr_reg->pr_tport, t_port)) &&
0952              (pr_reg->pr_reg_tpgt == tpgt) &&
0953              (pr_reg->pr_aptpl_target_lun == target_lun)) {
0954             /*
0955              * Obtain the ->pr_reg_deve pointer + reference, that
0956              * is released by __core_scsi3_add_registration() below.
0957              */
0958             rcu_read_lock();
0959             pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
0960             if (!pr_reg->pr_reg_deve) {
0961                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
0962                     " %llu\n", nacl->initiatorname, mapped_lun);
0963                 rcu_read_unlock();
0964                 continue;
0965             }
0966             kref_get(&pr_reg->pr_reg_deve->pr_kref);
0967             rcu_read_unlock();
0968
0969             pr_reg->pr_reg_nacl = nacl;
0970             pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
0971             list_del(&pr_reg->pr_reg_aptpl_list);
0972             spin_unlock(&pr_tmpl->aptpl_reg_lock);
0973             /*
0974              * At this point all of the pointers in *pr_reg will
0975              * be setup, so go ahead and add the registration.
0976              */
0977             __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
0978             /*
0979              * If this registration is the reservation holder,
0980              * make that happen now..
0981              */
0982             if (pr_reg->pr_res_holder)
0983                 core_scsi3_aptpl_reserve(dev, tpg,
0984                         nacl, pr_reg);
0985             /*
0986              * Reenable pr_aptpl_active to accept new metadata
0987              * updates once the SCSI device is active again..
0988              */
0989             spin_lock(&pr_tmpl->aptpl_reg_lock);
0990             pr_tmpl->pr_aptpl_active = 1;
0991         }
0992     }
0993     spin_unlock(&pr_tmpl->aptpl_reg_lock);
0994
0995     return 0;
0996 }
0997
0998 int core_scsi3_check_aptpl_registration(
0999     struct se_device *dev,
1000     struct se_portal_group *tpg,
1001     struct se_lun *lun,
1002     struct se_node_acl *nacl,
1003     u64 mapped_lun)
1004 {
1005     if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1006         return 0;
1007
1008     return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1009                              lun->unpacked_lun, nacl,
1010                              mapped_lun);
1011 }
1012
1013 static void __core_scsi3_dump_registration(
1014     const struct target_core_fabric_ops *tfo,
1015     struct se_device *dev,
1016     struct se_node_acl *nacl,
1017     struct t10_pr_registration *pr_reg,
1018     enum register_type register_type)
1019 {
1020     struct se_portal_group *se_tpg = nacl->se_tpg;
1021     char i_buf[PR_REG_ISID_ID_LEN] = { };
1022
1023     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1024
1025     pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1026         " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?
1027         "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1028         "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1029         i_buf);
1030     pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1031          tfo->fabric_name, tfo->tpg_get_wwn(se_tpg),
1032         tfo->tpg_get_tag(se_tpg));
1033     pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1034         " Port(s)\n",  tfo->fabric_name,
1035         (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1036         dev->transport->name);
1037     pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1038         " 0x%08x  APTPL: %d\n", tfo->fabric_name,
1039         pr_reg->pr_res_key, pr_reg->pr_res_generation,
1040         pr_reg->pr_reg_aptpl);
1041 }
1042
1043 static void __core_scsi3_add_registration(
1044     struct se_device *dev,
1045     struct se_node_acl *nacl,
1046     struct t10_pr_registration *pr_reg,
1047     enum register_type register_type,
1048     int register_move)
1049 {
1050     const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1051     struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1052     struct t10_reservation *pr_tmpl = &dev->t10_pr;
1053     struct se_dev_entry *deve;
1054
1055     /*
1056      * Increment PRgeneration counter for struct se_device upon a successful
1057      * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1058      *
1059      * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1060      * action, the struct se_device->dev_reservation_lock will already be held,
1061      * so we do not call core_scsi3_pr_generation() which grabs the lock
1062      * for the REGISTER.
1063      */
1064     pr_reg->pr_res_generation = (register_move) ?
1065             dev->t10_pr.pr_generation++ :
1066             core_scsi3_pr_generation(dev);
1067
1068     spin_lock(&pr_tmpl->registration_lock);
1069     list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1070
1071     __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1072     spin_unlock(&pr_tmpl->registration_lock);
1073     /*
1074      * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1075      */
1076     if (!pr_reg->pr_reg_all_tg_pt || register_move)
1077         goto out;
1078     /*
1079      * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1080      * allocated in __core_scsi3_alloc_registration()
1081      */
1082     list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1083             &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1084         struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1085
1086         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1087
1088         pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1089
1090         spin_lock(&pr_tmpl->registration_lock);
1091         list_add_tail(&pr_reg_tmp->pr_reg_list,
1092                   &pr_tmpl->registration_list);
1093
1094         __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1095                            register_type);
1096         spin_unlock(&pr_tmpl->registration_lock);
1097         /*
1098          * Drop configfs group dependency reference and deve->pr_kref
1099          * obtained from  __core_scsi3_alloc_registration() code.
1100          */
1101         rcu_read_lock();
1102         deve = pr_reg_tmp->pr_reg_deve;
1103         if (deve) {
1104             set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1105             core_scsi3_lunacl_undepend_item(deve);
1106             pr_reg_tmp->pr_reg_deve = NULL;
1107         }
1108         rcu_read_unlock();
1109     }
1110 out:
1111     /*
1112      * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1113      */
1114     rcu_read_lock();
1115     deve = pr_reg->pr_reg_deve;
1116     if (deve) {
1117         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1118         kref_put(&deve->pr_kref, target_pr_kref_release);
1119         pr_reg->pr_reg_deve = NULL;
1120     }
1121     rcu_read_unlock();
1122 }
1123
1124 static int core_scsi3_alloc_registration(
1125     struct se_device *dev,
1126     struct se_node_acl *nacl,
1127     struct se_lun *lun,
1128     struct se_dev_entry *deve,
1129     u64 mapped_lun,
1130     unsigned char *isid,
1131     u64 sa_res_key,
1132     int all_tg_pt,
1133     int aptpl,
1134     enum register_type register_type,
1135     int register_move)
1136 {
1137     struct t10_pr_registration *pr_reg;
1138
1139     pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1140                          isid, sa_res_key, all_tg_pt,
1141                          aptpl);
1142     if (!pr_reg)
1143         return -EPERM;
1144
1145     __core_scsi3_add_registration(dev, nacl, pr_reg,
1146             register_type, register_move);
1147     return 0;
1148 }
1149
1150 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1151     struct se_device *dev,
1152     struct se_node_acl *nacl,
1153     unsigned char *isid)
1154 {
1155     struct t10_reservation *pr_tmpl = &dev->t10_pr;
1156     struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1157
1158     spin_lock(&pr_tmpl->registration_lock);
1159     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1160             &pr_tmpl->registration_list, pr_reg_list) {
1161         /*
1162          * First look for a matching struct se_node_acl
1163          */
1164         if (pr_reg->pr_reg_nacl != nacl)
1165             continue;
1166
1167         /*
1168          * If this registration does NOT contain a fabric provided
1169          * ISID, then we have found a match.
1170          */
1171         if (!pr_reg->isid_present_at_reg) {
1172             atomic_inc_mb(&pr_reg->pr_res_holders);
1173             spin_unlock(&pr_tmpl->registration_lock);
1174             return pr_reg;
1175         }
1176         /*
1177          * If the *pr_reg contains a fabric defined ISID for multi-value
1178          * SCSI Initiator Port TransportIDs, then we expect a valid
1179          * matching ISID to be provided by the local SCSI Initiator Port.
1180          */
1181         if (!isid)
1182             continue;
1183         if (strcmp(isid, pr_reg->pr_reg_isid))
1184             continue;
1185
1186         atomic_inc_mb(&pr_reg->pr_res_holders);
1187         spin_unlock(&pr_tmpl->registration_lock);
1188         return pr_reg;
1189     }
1190     spin_unlock(&pr_tmpl->registration_lock);
1191
1192     return NULL;
1193 }
1194
1195 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1196     struct se_device *dev,
1197     struct se_node_acl *nacl,
1198     struct se_session *sess)
1199 {
1200     struct se_portal_group *tpg = nacl->se_tpg;
1201     unsigned char buf[PR_REG_ISID_LEN] = { };
1202     unsigned char *isid_ptr = NULL;
1203
1204     if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1205         tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1206                     PR_REG_ISID_LEN);
1207         isid_ptr = &buf[0];
1208     }
1209
1210     return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1211 }
1212
1213 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1214 {
1215     atomic_dec_mb(&pr_reg->pr_res_holders);
1216 }
1217
1218 static int core_scsi3_check_implicit_release(
1219     struct se_device *dev,
1220     struct t10_pr_registration *pr_reg)
1221 {
1222     struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1223     struct t10_pr_registration *pr_res_holder;
1224     int ret = 0;
1225
1226     spin_lock(&dev->dev_reservation_lock);
1227     pr_res_holder = dev->dev_pr_res_holder;
1228     if (!pr_res_holder) {
1229         spin_unlock(&dev->dev_reservation_lock);
1230         return ret;
1231     }
1232     if (pr_res_holder == pr_reg) {
1233         /*
1234          * Perform an implicit RELEASE if the registration that
1235          * is being released is holding the reservation.
1236          *
1237          * From spc4r17, section 5.7.11.1:
1238          *
1239          * e) If the I_T nexus is the persistent reservation holder
1240          *    and the persistent reservation is not an all registrants
1241          *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1242          *    service action or REGISTER AND  IGNORE EXISTING KEY
1243          *    service action with the SERVICE ACTION RESERVATION KEY
1244          *    field set to zero (see 5.7.11.3).
1245          */
1246         __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1247         ret = 1;
1248         /*
1249          * For 'All Registrants' reservation types, all existing
1250          * registrations are still processed as reservation holders
1251          * in core_scsi3_pr_seq_non_holder() after the initial
1252          * reservation holder is implicitly released here.
1253          */
1254     } else if (pr_reg->pr_reg_all_tg_pt &&
1255           (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1256               pr_reg->pr_reg_nacl->initiatorname)) &&
1257           (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1258         pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1259             " UNREGISTER while existing reservation with matching"
1260             " key 0x%016Lx is present from another SCSI Initiator"
1261             " Port\n", pr_reg->pr_res_key);
1262         ret = -EPERM;
1263     }
1264     spin_unlock(&dev->dev_reservation_lock);
1265
1266     return ret;
1267 }
1268
1269 static void __core_scsi3_free_registration(
1270     struct se_device *dev,
1271     struct t10_pr_registration *pr_reg,
1272     struct list_head *preempt_and_abort_list,
1273     int dec_holders)
1274     __releases(&pr_tmpl->registration_lock)
1275     __acquires(&pr_tmpl->registration_lock)
1276 {
1277     const struct target_core_fabric_ops *tfo =
1278             pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1279     struct t10_reservation *pr_tmpl = &dev->t10_pr;
1280     struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1281     struct se_dev_entry *deve;
1282     char i_buf[PR_REG_ISID_ID_LEN] = { };
1283
1284     lockdep_assert_held(&pr_tmpl->registration_lock);
1285
1286     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1287
1288     if (!list_empty(&pr_reg->pr_reg_list))
1289         list_del(&pr_reg->pr_reg_list);
1290     /*
1291      * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1292      * so call core_scsi3_put_pr_reg() to decrement our reference.
1293      */
1294     if (dec_holders)
1295         core_scsi3_put_pr_reg(pr_reg);
1296
1297     spin_unlock(&pr_tmpl->registration_lock);
1298     /*
1299      * Wait until all reference from any other I_T nexuses for this
1300      * *pr_reg have been released.  Because list_del() is called above,
1301      * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1302      * count back to zero, and we release *pr_reg.
1303      */
1304     while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1305         pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1306                 tfo->fabric_name);
1307         cpu_relax();
1308     }
1309
1310     rcu_read_lock();
1311     deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1312     if (deve)
1313         clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1314     rcu_read_unlock();
1315
1316     spin_lock(&pr_tmpl->registration_lock);
1317     pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1318         " Node: %s%s\n", tfo->fabric_name,
1319         pr_reg->pr_reg_nacl->initiatorname,
1320         i_buf);
1321     pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1322         " Port(s)\n", tfo->fabric_name,
1323         (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1324         dev->transport->name);
1325     pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1326         " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key,
1327         pr_reg->pr_res_generation);
1328
1329     if (!preempt_and_abort_list) {
1330         pr_reg->pr_reg_deve = NULL;
1331         pr_reg->pr_reg_nacl = NULL;
1332         kmem_cache_free(t10_pr_reg_cache, pr_reg);
1333         return;
1334     }
1335     /*
1336      * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1337      * are released once the ABORT_TASK_SET has completed..
1338      */
1339     list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1340 }
1341
1342 void core_scsi3_free_pr_reg_from_nacl(
1343     struct se_device *dev,
1344     struct se_node_acl *nacl)
1345 {
1346     struct t10_reservation *pr_tmpl = &dev->t10_pr;
1347     struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1348     bool free_reg = false;
1349     /*
1350      * If the passed se_node_acl matches the reservation holder,
1351      * release the reservation.
1352      */
1353     spin_lock(&dev->dev_reservation_lock);
1354     pr_res_holder = dev->dev_pr_res_holder;
1355     if ((pr_res_holder != NULL) &&
1356         (pr_res_holder->pr_reg_nacl == nacl)) {
1357         __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1358         free_reg = true;
1359     }
1360     spin_unlock(&dev->dev_reservation_lock);
1361     /*
1362      * Release any registration associated with the struct se_node_acl.
1363      */
1364     spin_lock(&pr_tmpl->registration_lock);
1365     if (pr_res_holder && free_reg)
1366         __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1367
1368     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1369             &pr_tmpl->registration_list, pr_reg_list) {
1370
1371         if (pr_reg->pr_reg_nacl != nacl)
1372             continue;
1373
1374         __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1375     }
1376     spin_unlock(&pr_tmpl->registration_lock);
1377 }
1378
1379 void core_scsi3_free_all_registrations(
1380     struct se_device *dev)
1381 {
1382     struct t10_reservation *pr_tmpl = &dev->t10_pr;
1383     struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1384
1385     spin_lock(&dev->dev_reservation_lock);
1386     pr_res_holder = dev->dev_pr_res_holder;
1387     if (pr_res_holder != NULL) {
1388         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1389         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1390                           pr_res_holder, 0, 0);
1391     }
1392     spin_unlock(&dev->dev_reservation_lock);
1393
1394     spin_lock(&pr_tmpl->registration_lock);
1395     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1396             &pr_tmpl->registration_list, pr_reg_list) {
1397
1398         __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1399     }
1400     spin_unlock(&pr_tmpl->registration_lock);
1401
1402     spin_lock(&pr_tmpl->aptpl_reg_lock);
1403     list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1404                 pr_reg_aptpl_list) {
1405         list_del(&pr_reg->pr_reg_aptpl_list);
1406         kmem_cache_free(t10_pr_reg_cache, pr_reg);
1407     }
1408     spin_unlock(&pr_tmpl->aptpl_reg_lock);
1409 }
1410
1411 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1412 {
1413     return target_depend_item(&tpg->tpg_group.cg_item);
1414 }
1415
1416 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1417 {
1418     target_undepend_item(&tpg->tpg_group.cg_item);
1419     atomic_dec_mb(&tpg->tpg_pr_ref_count);
1420 }
1421
1422 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1423 {
1424     if (nacl->dynamic_node_acl)
1425         return 0;
1426     return target_depend_item(&nacl->acl_group.cg_item);
1427 }
1428
1429 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1430 {
1431     if (!nacl->dynamic_node_acl)
1432         target_undepend_item(&nacl->acl_group.cg_item);
1433     atomic_dec_mb(&nacl->acl_pr_ref_count);
1434 }
1435
1436 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1437 {
1438     /*
1439      * For nacl->dynamic_node_acl=1
1440      */
1441     if (!se_deve->se_lun_acl)
1442         return 0;
1443
1444     return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
1445 }
1446
1447 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1448 {
1449     /*
1450      * For nacl->dynamic_node_acl=1
1451      */
1452     if (!se_deve->se_lun_acl) {
1453         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1454         return;
1455     }
1456
1457     target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
1458     kref_put(&se_deve->pr_kref, target_pr_kref_release);
1459 }
1460
1461 static sense_reason_t
1462 core_scsi3_decode_spec_i_port(
1463     struct se_cmd *cmd,
1464     struct se_portal_group *tpg,
1465     unsigned char *l_isid,
1466     u64 sa_res_key,
1467     int all_tg_pt,
1468     int aptpl)
1469 {
1470     struct se_device *dev = cmd->se_dev;
1471     struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1472     struct se_session *se_sess = cmd->se_sess;
1473     struct se_node_acl *dest_node_acl = NULL;
1474     struct se_dev_entry *dest_se_deve = NULL;
1475     struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1476     struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1477     LIST_HEAD(tid_dest_list);
1478     struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1479     unsigned char *buf, *ptr, proto_ident;
1480     const unsigned char *i_str = NULL;
1481     char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1482     sense_reason_t ret;
1483     u32 tpdl, tid_len = 0;
1484     u32 dest_rtpi = 0;
1485
1486     /*
1487      * Allocate a struct pr_transport_id_holder and setup the
1488      * local_node_acl pointer and add to struct list_head tid_dest_list
1489      * for add registration processing in the loop of tid_dest_list below.
1490      */
1491     tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1492     if (!tidh_new) {
1493         pr_err("Unable to allocate tidh_new\n");
1494         return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1495     }
1496     INIT_LIST_HEAD(&tidh_new->dest_list);
1497     tidh_new->dest_tpg = tpg;
1498     tidh_new->dest_node_acl = se_sess->se_node_acl;
1499
1500     local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1501                 se_sess->se_node_acl, cmd->se_lun,
1502                 NULL, cmd->orig_fe_lun, l_isid,
1503                 sa_res_key, all_tg_pt, aptpl);
1504     if (!local_pr_reg) {
1505         kfree(tidh_new);
1506         return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1507     }
1508
1509     if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
1510         kfree(tidh_new);
1511         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1512              target_pr_kref_release);
1513         kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
1514         return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1515     }
1516
1517     tidh_new->dest_pr_reg = local_pr_reg;
1518     list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1519
1520     if (cmd->data_length < 28) {
1521         pr_warn("SPC-PR: Received PR OUT parameter list"
1522             " length too small: %u\n", cmd->data_length);
1523         ret = TCM_INVALID_PARAMETER_LIST;
1524         goto out;
1525     }
1526
1527     buf = transport_kmap_data_sg(cmd);
1528     if (!buf) {
1529         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1530         goto out;
1531     }
1532
1533     /*
1534      * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1535      * first extract TransportID Parameter Data Length, and make sure
1536      * the value matches up to the SCSI expected data transfer length.
1537      */
1538     tpdl = get_unaligned_be32(&buf[24]);
1539
1540     if ((tpdl + 28) != cmd->data_length) {
1541         pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1542             " does not equal CDB data_length: %u\n", tpdl,
1543             cmd->data_length);
1544         ret = TCM_INVALID_PARAMETER_LIST;
1545         goto out_unmap;
1546     }
1547     /*
1548      * Start processing the received transport IDs using the
1549      * receiving I_T Nexus portal's fabric dependent methods to
1550      * obtain the SCSI Initiator Port/Device Identifiers.
1551      */
1552     ptr = &buf[28];
1553
1554     while (tpdl > 0) {
1555         struct se_lun *dest_lun, *tmp_lun;
1556
1557         proto_ident = (ptr[0] & 0x0f);
1558         dest_tpg = NULL;
1559
1560         spin_lock(&dev->se_port_lock);
1561         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1562             tmp_tpg = tmp_lun->lun_tpg;
1563
1564             /*
1565              * Look for the matching proto_ident provided by
1566              * the received TransportID
1567              */
1568             if (tmp_tpg->proto_id != proto_ident)
1569                 continue;
1570             dest_rtpi = tmp_lun->lun_rtpi;
1571
1572             iport_ptr = NULL;
1573             i_str = target_parse_pr_out_transport_id(tmp_tpg,
1574                     ptr, &tid_len, &iport_ptr);
1575             if (!i_str)
1576                 continue;
1577             /*
1578              * Determine if this SCSI device server requires that
1579              * SCSI Intiatior TransportID w/ ISIDs is enforced
1580              * for fabric modules (iSCSI) requiring them.
1581              */
1582             if (tpg->se_tpg_tfo->sess_get_initiator_sid &&
1583                 dev->dev_attrib.enforce_pr_isids &&
1584                 !iport_ptr) {
1585                 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",
1586                     i_str);
1587                 ret = TCM_INVALID_PARAMETER_LIST;
1588                 spin_unlock(&dev->se_port_lock);
1589                 goto out_unmap;
1590             }
1591
1592             atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1593             spin_unlock(&dev->se_port_lock);
1594
1595             if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1596                 pr_err(" core_scsi3_tpg_depend_item()"
1597                     " for tmp_tpg\n");
1598                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1599                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1600                 goto out_unmap;
1601             }
1602             /*
1603              * Locate the destination initiator ACL to be registered
1604              * from the decoded fabric module specific TransportID
1605              * at *i_str.
1606              */
1607             mutex_lock(&tmp_tpg->acl_node_mutex);
1608             dest_node_acl = __core_tpg_get_initiator_node_acl(
1609                         tmp_tpg, i_str);
1610             if (dest_node_acl)
1611                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1612             mutex_unlock(&tmp_tpg->acl_node_mutex);
1613
1614             if (!dest_node_acl) {
1615                 core_scsi3_tpg_undepend_item(tmp_tpg);
1616                 spin_lock(&dev->se_port_lock);
1617                 continue;
1618             }
1619
1620             if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1621                 pr_err("configfs_depend_item() failed"
1622                     " for dest_node_acl->acl_group\n");
1623                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1624                 core_scsi3_tpg_undepend_item(tmp_tpg);
1625                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1626                 goto out_unmap;
1627             }
1628
1629             dest_tpg = tmp_tpg;
1630             pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",
1631                 dest_tpg->se_tpg_tfo->fabric_name,
1632                 dest_node_acl->initiatorname, dest_rtpi);
1633
1634             spin_lock(&dev->se_port_lock);
1635             break;
1636         }
1637         spin_unlock(&dev->se_port_lock);
1638
1639         if (!dest_tpg) {
1640             pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1641                     " dest_tpg\n");
1642             ret = TCM_INVALID_PARAMETER_LIST;
1643             goto out_unmap;
1644         }
1645
1646         pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1647             " tid_len: %d for %s + %s\n",
1648             dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length,
1649             tpdl, tid_len, i_str, iport_ptr);
1650
1651         if (tid_len > tpdl) {
1652             pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1653                 " %u for Transport ID: %s\n", tid_len, ptr);
1654             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1655             core_scsi3_tpg_undepend_item(dest_tpg);
1656             ret = TCM_INVALID_PARAMETER_LIST;
1657             goto out_unmap;
1658         }
1659         /*
1660          * Locate the desintation struct se_dev_entry pointer for matching
1661          * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1662          * Target Port.
1663          */
1664         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1665                     dest_rtpi);
1666         if (!dest_se_deve) {
1667             pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n",
1668                 dest_tpg->se_tpg_tfo->fabric_name,
1669                 dest_rtpi);
1670
1671             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672             core_scsi3_tpg_undepend_item(dest_tpg);
1673             ret = TCM_INVALID_PARAMETER_LIST;
1674             goto out_unmap;
1675         }
1676
1677         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1678             pr_err("core_scsi3_lunacl_depend_item()"
1679                     " failed\n");
1680             kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1681             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1682             core_scsi3_tpg_undepend_item(dest_tpg);
1683             ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1684             goto out_unmap;
1685         }
1686
1687         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1688             " dest_se_deve mapped_lun: %llu\n",
1689             dest_tpg->se_tpg_tfo->fabric_name,
1690             dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1691
1692         /*
1693          * Skip any TransportIDs that already have a registration for
1694          * this target port.
1695          */
1696         pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1697                     iport_ptr);
1698         if (pr_reg_e) {
1699             core_scsi3_put_pr_reg(pr_reg_e);
1700             core_scsi3_lunacl_undepend_item(dest_se_deve);
1701             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1702             core_scsi3_tpg_undepend_item(dest_tpg);
1703             ptr += tid_len;
1704             tpdl -= tid_len;
1705             tid_len = 0;
1706             continue;
1707         }
1708         /*
1709          * Allocate a struct pr_transport_id_holder and setup
1710          * the dest_node_acl and dest_se_deve pointers for the
1711          * loop below.
1712          */
1713         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1714                 GFP_KERNEL);
1715         if (!tidh_new) {
1716             pr_err("Unable to allocate tidh_new\n");
1717             core_scsi3_lunacl_undepend_item(dest_se_deve);
1718             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1719             core_scsi3_tpg_undepend_item(dest_tpg);
1720             ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1721             goto out_unmap;
1722         }
1723         INIT_LIST_HEAD(&tidh_new->dest_list);
1724         tidh_new->dest_tpg = dest_tpg;
1725         tidh_new->dest_node_acl = dest_node_acl;
1726         tidh_new->dest_se_deve = dest_se_deve;
1727
1728         /*
1729          * Allocate, but do NOT add the registration for the
1730          * TransportID referenced SCSI Initiator port.  This
1731          * done because of the following from spc4r17 in section
1732          * 6.14.3 wrt SPEC_I_PT:
1733          *
1734          * "If a registration fails for any initiator port (e.g., if th
1735          * logical unit does not have enough resources available to
1736          * hold the registration information), no registrations shall be
1737          * made, and the command shall be terminated with
1738          * CHECK CONDITION status."
1739          *
1740          * That means we call __core_scsi3_alloc_registration() here,
1741          * and then call __core_scsi3_add_registration() in the
1742          * 2nd loop which will never fail.
1743          */
1744         dest_lun = dest_se_deve->se_lun;
1745
1746         dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1747                     dest_node_acl, dest_lun, dest_se_deve,
1748                     dest_se_deve->mapped_lun, iport_ptr,
1749                     sa_res_key, all_tg_pt, aptpl);
1750         if (!dest_pr_reg) {
1751             core_scsi3_lunacl_undepend_item(dest_se_deve);
1752             core_scsi3_nodeacl_undepend_item(dest_node_acl);
1753             core_scsi3_tpg_undepend_item(dest_tpg);
1754             kfree(tidh_new);
1755             ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1756             goto out_unmap;
1757         }
1758         tidh_new->dest_pr_reg = dest_pr_reg;
1759         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1760
1761         ptr += tid_len;
1762         tpdl -= tid_len;
1763         tid_len = 0;
1764
1765     }
1766
1767     transport_kunmap_data_sg(cmd);
1768
1769     /*
1770      * Go ahead and create a registrations from tid_dest_list for the
1771      * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1772      * and dest_se_deve.
1773      *
1774      * The SA Reservation Key from the PROUT is set for the
1775      * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1776      * means that the TransportID Initiator port will be
1777      * registered on all of the target ports in the SCSI target device
1778      * ALL_TG_PT=0 means the registration will only be for the
1779      * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1780      * was received.
1781      */
1782     list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1783         dest_tpg = tidh->dest_tpg;
1784         dest_node_acl = tidh->dest_node_acl;
1785         dest_se_deve = tidh->dest_se_deve;
1786         dest_pr_reg = tidh->dest_pr_reg;
1787
1788         list_del(&tidh->dest_list);
1789         kfree(tidh);
1790
1791         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1792         core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1793
1794         __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1795                     dest_pr_reg, 0, 0);
1796
1797         pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1798             " registered Transport ID for Node: %s%s Mapped LUN:"
1799             " %llu\n", dest_tpg->se_tpg_tfo->fabric_name,
1800             dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1801             dest_se_deve->mapped_lun : 0);
1802
1803         if (dest_pr_reg == local_pr_reg)
1804             continue;
1805
1806         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1807         core_scsi3_tpg_undepend_item(dest_tpg);
1808     }
1809
1810     return 0;
1811 out_unmap:
1812     transport_kunmap_data_sg(cmd);
1813 out:
1814     /*
1815      * For the failure case, release everything from tid_dest_list
1816      * including *dest_pr_reg and the configfs dependances..
1817      */
1818     list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1819         bool is_local = false;
1820
1821         dest_tpg = tidh->dest_tpg;
1822         dest_node_acl = tidh->dest_node_acl;
1823         dest_se_deve = tidh->dest_se_deve;
1824         dest_pr_reg = tidh->dest_pr_reg;
1825
1826         if (dest_pr_reg == local_pr_reg)
1827             is_local = true;
1828
1829         list_del(&tidh->dest_list);
1830         kfree(tidh);
1831         /*
1832          * Release any extra ALL_TG_PT=1 registrations for
1833          * the SPEC_I_PT=1 case.
1834          */
1835         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1836                 &dest_pr_reg->pr_reg_atp_list,
1837                 pr_reg_atp_mem_list) {
1838             list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1839             core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1840             kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1841         }
1842
1843         kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1844         core_scsi3_lunacl_undepend_item(dest_se_deve);
1845
1846         if (is_local)
1847             continue;
1848
1849         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1850         core_scsi3_tpg_undepend_item(dest_tpg);
1851     }
1852     return ret;
1853 }
1854
1855 static int core_scsi3_update_aptpl_buf(
1856     struct se_device *dev,
1857     unsigned char *buf,
1858     u32 pr_aptpl_buf_len)
1859 {
1860     struct se_portal_group *tpg;
1861     struct t10_pr_registration *pr_reg;
1862     unsigned char tmp[512], isid_buf[32];
1863     ssize_t len = 0;
1864     int reg_count = 0;
1865     int ret = 0;
1866
1867     spin_lock(&dev->dev_reservation_lock);
1868     spin_lock(&dev->t10_pr.registration_lock);
1869     /*
1870      * Walk the registration list..
1871      */
1872     list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1873             pr_reg_list) {
1874
1875         tmp[0] = '\0';
1876         isid_buf[0] = '\0';
1877         tpg = pr_reg->pr_reg_nacl->se_tpg;
1878         /*
1879          * Write out any ISID value to APTPL metadata that was included
1880          * in the original registration.
1881          */
1882         if (pr_reg->isid_present_at_reg)
1883             snprintf(isid_buf, 32, "initiator_sid=%s\n",
1884                     pr_reg->pr_reg_isid);
1885         /*
1886          * Include special metadata if the pr_reg matches the
1887          * reservation holder.
1888          */
1889         if (dev->dev_pr_res_holder == pr_reg) {
1890             snprintf(tmp, 512, "PR_REG_START: %d"
1891                 "\ninitiator_fabric=%s\n"
1892                 "initiator_node=%s\n%s"
1893                 "sa_res_key=%llu\n"
1894                 "res_holder=1\nres_type=%02x\n"
1895                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1896                 "mapped_lun=%llu\n", reg_count,
1897                 tpg->se_tpg_tfo->fabric_name,
1898                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1899                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1900                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1901                 pr_reg->pr_res_mapped_lun);
1902         } else {
1903             snprintf(tmp, 512, "PR_REG_START: %d\n"
1904                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1905                 "sa_res_key=%llu\nres_holder=0\n"
1906                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1907                 reg_count, tpg->se_tpg_tfo->fabric_name,
1908                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1909                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1910                 pr_reg->pr_res_mapped_lun);
1911         }
1912
1913         if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1914             pr_err("Unable to update renaming APTPL metadata,"
1915                    " reallocating larger buffer\n");
1916             ret = -EMSGSIZE;
1917             goto out;
1918         }
1919         len += sprintf(buf+len, "%s", tmp);
1920
1921         /*
1922          * Include information about the associated SCSI target port.
1923          */
1924         snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1925             "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1926             " %d\n", tpg->se_tpg_tfo->fabric_name,
1927             tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1928             tpg->se_tpg_tfo->tpg_get_tag(tpg),
1929             pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1930             reg_count);
1931
1932         if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1933             pr_err("Unable to update renaming APTPL metadata,"
1934                    " reallocating larger buffer\n");
1935             ret = -EMSGSIZE;
1936             goto out;
1937         }
1938         len += sprintf(buf+len, "%s", tmp);
1939         reg_count++;
1940     }
1941
1942     if (!reg_count)
1943         len += sprintf(buf+len, "No Registrations or Reservations");
1944
1945 out:
1946     spin_unlock(&dev->t10_pr.registration_lock);
1947     spin_unlock(&dev->dev_reservation_lock);
1948
1949     return ret;
1950 }
1951
1952 static int __core_scsi3_write_aptpl_to_file(
1953     struct se_device *dev,
1954     unsigned char *buf)
1955 {
1956     struct t10_wwn *wwn = &dev->t10_wwn;
1957     struct file *file;
1958     int flags = O_RDWR | O_CREAT | O_TRUNC;
1959     char *path;
1960     u32 pr_aptpl_buf_len;
1961     int ret;
1962     loff_t pos = 0;
1963
1964     path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
1965             &wwn->unit_serial[0]);
1966     if (!path)
1967         return -ENOMEM;
1968
1969     file = filp_open(path, flags, 0600);
1970     if (IS_ERR(file)) {
1971         pr_err("filp_open(%s) for APTPL metadata"
1972             " failed\n", path);
1973         kfree(path);
1974         return PTR_ERR(file);
1975     }
1976
1977     pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1978
1979     ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
1980
1981     if (ret < 0)
1982         pr_debug("Error writing APTPL metadata file: %s\n", path);
1983     fput(file);
1984     kfree(path);
1985
1986     return (ret < 0) ? -EIO : 0;
1987 }
1988
1989 /*
1990  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1991  * write out the updated metadata to struct file for this SCSI device.
1992  */
1993 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1994 {
1995     unsigned char *buf;
1996     int rc, len = PR_APTPL_BUF_LEN;
1997
1998     if (!aptpl) {
1999         char *null_buf = "No Registrations or Reservations\n";
2000
2001         rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2002         dev->t10_pr.pr_aptpl_active = 0;
2003         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2004
2005         if (rc)
2006             return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2007
2008         return 0;
2009     }
2010 retry:
2011     buf = vzalloc(len);
2012     if (!buf)
2013         return TCM_OUT_OF_RESOURCES;
2014
2015     rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2016     if (rc < 0) {
2017         vfree(buf);
2018         len *= 2;
2019         goto retry;
2020     }
2021
2022     rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2023     if (rc != 0) {
2024         pr_err("SPC-3 PR: Could not update APTPL\n");
2025         vfree(buf);
2026         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2027     }
2028     dev->t10_pr.pr_aptpl_active = 1;
2029     vfree(buf);
2030     pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2031     return 0;
2032 }
2033
2034 static sense_reason_t
2035 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2036         bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2037 {
2038     struct se_session *se_sess = cmd->se_sess;
2039     struct se_device *dev = cmd->se_dev;
2040     struct se_lun *se_lun = cmd->se_lun;
2041     struct se_portal_group *se_tpg;
2042     struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2043     struct t10_reservation *pr_tmpl = &dev->t10_pr;
2044     unsigned char isid_buf[PR_REG_ISID_LEN] = { };
2045     unsigned char *isid_ptr = NULL;
2046     sense_reason_t ret = TCM_NO_SENSE;
2047     int pr_holder = 0, type;
2048
2049     if (!se_sess || !se_lun) {
2050         pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2051         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2052     }
2053     se_tpg = se_sess->se_tpg;
2054
2055     if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2056         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2057                 PR_REG_ISID_LEN);
2058         isid_ptr = &isid_buf[0];
2059     }
2060     /*
2061      * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2062      */
2063     pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2064     if (!pr_reg) {
2065         if (res_key) {
2066             pr_warn("SPC-3 PR: Reservation Key non-zero"
2067                 " for SA REGISTER, returning CONFLICT\n");
2068             return TCM_RESERVATION_CONFLICT;
2069         }
2070         /*
2071          * Do nothing but return GOOD status.
2072          */
2073         if (!sa_res_key)
2074             return 0;
2075
2076         if (!spec_i_pt) {
2077             /*
2078              * Perform the Service Action REGISTER on the Initiator
2079              * Port Endpoint that the PRO was received from on the
2080              * Logical Unit of the SCSI device server.
2081              */
2082             if (core_scsi3_alloc_registration(cmd->se_dev,
2083                     se_sess->se_node_acl, cmd->se_lun,
2084                     NULL, cmd->orig_fe_lun, isid_ptr,
2085                     sa_res_key, all_tg_pt, aptpl,
2086                     register_type, 0)) {
2087                 pr_err("Unable to allocate"
2088                     " struct t10_pr_registration\n");
2089                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
2090             }
2091         } else {
2092             /*
2093              * Register both the Initiator port that received
2094              * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2095              * TransportID from Parameter list and loop through
2096              * fabric dependent parameter list while calling
2097              * logic from of core_scsi3_alloc_registration() for
2098              * each TransportID provided SCSI Initiator Port/Device
2099              */
2100             ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2101                     isid_ptr, sa_res_key, all_tg_pt, aptpl);
2102             if (ret != 0)
2103                 return ret;
2104         }
2105         return core_scsi3_update_and_write_aptpl(dev, aptpl);
2106     }
2107
2108     /* ok, existing registration */
2109
2110     if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2111         pr_err("SPC-3 PR REGISTER: Received"
2112                " res_key: 0x%016Lx does not match"
2113                " existing SA REGISTER res_key:"
2114                " 0x%016Lx\n", res_key,
2115                pr_reg->pr_res_key);
2116         ret = TCM_RESERVATION_CONFLICT;
2117         goto out;
2118     }
2119
2120     if (spec_i_pt) {
2121         pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2122             " set on a registered nexus\n");
2123         ret = TCM_INVALID_PARAMETER_LIST;
2124         goto out;
2125     }
2126
2127     /*
2128      * An existing ALL_TG_PT=1 registration being released
2129      * must also set ALL_TG_PT=1 in the incoming PROUT.
2130      */
2131     if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2132         pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2133             " registration exists, but ALL_TG_PT=1 bit not"
2134             " present in received PROUT\n");
2135         ret = TCM_INVALID_CDB_FIELD;
2136         goto out;
2137     }
2138
2139     /*
2140      * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2141      */
2142     if (sa_res_key) {
2143         /*
2144          * Increment PRgeneration counter for struct se_device"
2145          * upon a successful REGISTER, see spc4r17 section 6.3.2
2146          * READ_KEYS service action.
2147          */
2148         pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2149         pr_reg->pr_res_key = sa_res_key;
2150         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2151              " Key for %s to: 0x%016Lx PRgeneration:"
2152              " 0x%08x\n", cmd->se_tfo->fabric_name,
2153              (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2154              pr_reg->pr_reg_nacl->initiatorname,
2155              pr_reg->pr_res_key, pr_reg->pr_res_generation);
2156
2157     } else {
2158         /*
2159          * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2160          */
2161         type = pr_reg->pr_res_type;
2162         pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2163                                   pr_reg);
2164         if (pr_holder < 0) {
2165             ret = TCM_RESERVATION_CONFLICT;
2166             goto out;
2167         }
2168
2169         spin_lock(&pr_tmpl->registration_lock);
2170         /*
2171          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2172          * and matching pr_res_key.
2173          */
2174         if (pr_reg->pr_reg_all_tg_pt) {
2175             list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2176                     &pr_tmpl->registration_list,
2177                     pr_reg_list) {
2178
2179                 if (!pr_reg_p->pr_reg_all_tg_pt)
2180                     continue;
2181                 if (pr_reg_p->pr_res_key != res_key)
2182                     continue;
2183                 if (pr_reg == pr_reg_p)
2184                     continue;
2185                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2186                        pr_reg_p->pr_reg_nacl->initiatorname))
2187                     continue;
2188
2189                 __core_scsi3_free_registration(dev,
2190                         pr_reg_p, NULL, 0);
2191             }
2192         }
2193
2194         /*
2195          * Release the calling I_T Nexus registration now..
2196          */
2197         __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2198         pr_reg = NULL;
2199
2200         /*
2201          * From spc4r17, section 5.7.11.3 Unregistering
2202          *
2203          * If the persistent reservation is a registrants only
2204          * type, the device server shall establish a unit
2205          * attention condition for the initiator port associated
2206          * with every registered I_T nexus except for the I_T
2207          * nexus on which the PERSISTENT RESERVE OUT command was
2208          * received, with the additional sense code set to
2209          * RESERVATIONS RELEASED.
2210          */
2211         if (pr_holder &&
2212             (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2213              type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2214             list_for_each_entry(pr_reg_p,
2215                     &pr_tmpl->registration_list,
2216                     pr_reg_list) {
2217
2218                 target_ua_allocate_lun(
2219                     pr_reg_p->pr_reg_nacl,
2220                     pr_reg_p->pr_res_mapped_lun,
2221                     0x2A,
2222                     ASCQ_2AH_RESERVATIONS_RELEASED);
2223             }
2224         }
2225
2226         spin_unlock(&pr_tmpl->registration_lock);
2227     }
2228
2229     ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2230
2231 out:
2232     if (pr_reg)
2233         core_scsi3_put_pr_reg(pr_reg);
2234     return ret;
2235 }
2236
2237 unsigned char *core_scsi3_pr_dump_type(int type)
2238 {
2239     switch (type) {
2240     case PR_TYPE_WRITE_EXCLUSIVE:
2241         return "Write Exclusive Access";
2242     case PR_TYPE_EXCLUSIVE_ACCESS:
2243         return "Exclusive Access";
2244     case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2245         return "Write Exclusive Access, Registrants Only";
2246     case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2247         return "Exclusive Access, Registrants Only";
2248     case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2249         return "Write Exclusive Access, All Registrants";
2250     case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2251         return "Exclusive Access, All Registrants";
2252     default:
2253         break;
2254     }
2255
2256     return "Unknown SPC-3 PR Type";
2257 }
2258
2259 static sense_reason_t
2260 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2261 {
2262     struct se_device *dev = cmd->se_dev;
2263     struct se_session *se_sess = cmd->se_sess;
2264     struct se_lun *se_lun = cmd->se_lun;
2265     struct t10_pr_registration *pr_reg, *pr_res_holder;
2266     struct t10_reservation *pr_tmpl = &dev->t10_pr;
2267     char i_buf[PR_REG_ISID_ID_LEN] = { };
2268     sense_reason_t ret;
2269
2270     if (!se_sess || !se_lun) {
2271         pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2272         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2273     }
2274     /*
2275      * Locate the existing *pr_reg via struct se_node_acl pointers
2276      */
2277     pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2278                 se_sess);
2279     if (!pr_reg) {
2280         pr_err("SPC-3 PR: Unable to locate"
2281             " PR_REGISTERED *pr_reg for RESERVE\n");
2282         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2283     }
2284     /*
2285      * From spc4r17 Section 5.7.9: Reserving:
2286      *
2287      * An application client creates a persistent reservation by issuing
2288      * a PERSISTENT RESERVE OUT command with RESERVE service action through
2289      * a registered I_T nexus with the following parameters:
2290      *    a) RESERVATION KEY set to the value of the reservation key that is
2291      *   registered with the logical unit for the I_T nexus; and
2292      */
2293     if (res_key != pr_reg->pr_res_key) {
2294         pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2295             " does not match existing SA REGISTER res_key:"
2296             " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2297         ret = TCM_RESERVATION_CONFLICT;
2298         goto out_put_pr_reg;
2299     }
2300     /*
2301      * From spc4r17 Section 5.7.9: Reserving:
2302      *
2303      * From above:
2304      *  b) TYPE field and SCOPE field set to the persistent reservation
2305      *     being created.
2306      *
2307      * Only one persistent reservation is allowed at a time per logical unit
2308      * and that persistent reservation has a scope of LU_SCOPE.
2309      */
2310     if (scope != PR_SCOPE_LU_SCOPE) {
2311         pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2312         ret = TCM_INVALID_PARAMETER_LIST;
2313         goto out_put_pr_reg;
2314     }
2315     /*
2316      * See if we have an existing PR reservation holder pointer at
2317      * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2318      * *pr_res_holder.
2319      */
2320     spin_lock(&dev->dev_reservation_lock);
2321     pr_res_holder = dev->dev_pr_res_holder;
2322     if (pr_res_holder) {
2323         /*
2324          * From spc4r17 Section 5.7.9: Reserving:
2325          *
2326          * If the device server receives a PERSISTENT RESERVE OUT
2327          * command from an I_T nexus other than a persistent reservation
2328          * holder (see 5.7.10) that attempts to create a persistent
2329          * reservation when a persistent reservation already exists for
2330          * the logical unit, then the command shall be completed with
2331          * RESERVATION CONFLICT status.
2332          */
2333         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2334             struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2335             pr_err("SPC-3 PR: Attempted RESERVE from"
2336                 " [%s]: %s while reservation already held by"
2337                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2338                 cmd->se_tfo->fabric_name,
2339                 se_sess->se_node_acl->initiatorname,
2340                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2341                 pr_res_holder->pr_reg_nacl->initiatorname);
2342
2343             spin_unlock(&dev->dev_reservation_lock);
2344             ret = TCM_RESERVATION_CONFLICT;
2345             goto out_put_pr_reg;
2346         }
2347         /*
2348          * From spc4r17 Section 5.7.9: Reserving:
2349          *
2350          * If a persistent reservation holder attempts to modify the
2351          * type or scope of an existing persistent reservation, the
2352          * command shall be completed with RESERVATION CONFLICT status.
2353          */
2354         if ((pr_res_holder->pr_res_type != type) ||
2355             (pr_res_holder->pr_res_scope != scope)) {
2356             struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2357             pr_err("SPC-3 PR: Attempted RESERVE from"
2358                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2359                 " while reservation already held by [%s]: %s,"
2360                 " returning RESERVATION_CONFLICT\n",
2361                 cmd->se_tfo->fabric_name,
2362                 se_sess->se_node_acl->initiatorname,
2363                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2364                 pr_res_holder->pr_reg_nacl->initiatorname);
2365
2366             spin_unlock(&dev->dev_reservation_lock);
2367             ret = TCM_RESERVATION_CONFLICT;
2368             goto out_put_pr_reg;
2369         }
2370         /*
2371          * From spc4r17 Section 5.7.9: Reserving:
2372          *
2373          * If the device server receives a PERSISTENT RESERVE OUT
2374          * command with RESERVE service action where the TYPE field and
2375          * the SCOPE field contain the same values as the existing type
2376          * and scope from a persistent reservation holder, it shall not
2377          * make any change to the existing persistent reservation and
2378          * shall completethe command with GOOD status.
2379          */
2380         spin_unlock(&dev->dev_reservation_lock);
2381         ret = 0;
2382         goto out_put_pr_reg;
2383     }
2384     /*
2385      * Otherwise, our *pr_reg becomes the PR reservation holder for said
2386      * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2387      */
2388     pr_reg->pr_res_scope = scope;
2389     pr_reg->pr_res_type = type;
2390     pr_reg->pr_res_holder = 1;
2391     dev->dev_pr_res_holder = pr_reg;
2392     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2393
2394     pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2395         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2396         cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),
2397         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2398     pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2399             cmd->se_tfo->fabric_name,
2400             se_sess->se_node_acl->initiatorname,
2401             i_buf);
2402     spin_unlock(&dev->dev_reservation_lock);
2403
2404     if (pr_tmpl->pr_aptpl_active)
2405         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2406
2407     ret = 0;
2408 out_put_pr_reg:
2409     core_scsi3_put_pr_reg(pr_reg);
2410     return ret;
2411 }
2412
2413 static sense_reason_t
2414 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2415         u64 res_key)
2416 {
2417     switch (type) {
2418     case PR_TYPE_WRITE_EXCLUSIVE:
2419     case PR_TYPE_EXCLUSIVE_ACCESS:
2420     case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2421     case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2422     case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2423     case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2424         return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2425     default:
2426         pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2427             " 0x%02x\n", type);
2428         return TCM_INVALID_CDB_FIELD;
2429     }
2430 }
2431
2432 static void __core_scsi3_complete_pro_release(
2433     struct se_device *dev,
2434     struct se_node_acl *se_nacl,
2435     struct t10_pr_registration *pr_reg,
2436     int explicit,
2437     int unreg)
2438 {
2439     const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2440     char i_buf[PR_REG_ISID_ID_LEN] = { };
2441     int pr_res_type = 0, pr_res_scope = 0;
2442
2443     lockdep_assert_held(&dev->dev_reservation_lock);
2444
2445     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2446     /*
2447      * Go ahead and release the current PR reservation holder.
2448      * If an All Registrants reservation is currently active and
2449      * a unregister operation is requested, replace the current
2450      * dev_pr_res_holder with another active registration.
2451      */
2452     if (dev->dev_pr_res_holder) {
2453         pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2454         pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2455         dev->dev_pr_res_holder->pr_res_type = 0;
2456         dev->dev_pr_res_holder->pr_res_scope = 0;
2457         dev->dev_pr_res_holder->pr_res_holder = 0;
2458         dev->dev_pr_res_holder = NULL;
2459     }
2460     if (!unreg)
2461         goto out;
2462
2463     spin_lock(&dev->t10_pr.registration_lock);
2464     list_del_init(&pr_reg->pr_reg_list);
2465     /*
2466      * If the I_T nexus is a reservation holder, the persistent reservation
2467      * is of an all registrants type, and the I_T nexus is the last remaining
2468      * registered I_T nexus, then the device server shall also release the
2469      * persistent reservation.
2470      */
2471     if (!list_empty(&dev->t10_pr.registration_list) &&
2472         ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2473          (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2474         dev->dev_pr_res_holder =
2475             list_entry(dev->t10_pr.registration_list.next,
2476                    struct t10_pr_registration, pr_reg_list);
2477         dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2478         dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2479         dev->dev_pr_res_holder->pr_res_holder = 1;
2480     }
2481     spin_unlock(&dev->t10_pr.registration_lock);
2482 out:
2483     if (!dev->dev_pr_res_holder) {
2484         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2485             " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2486             tfo->fabric_name, (explicit) ? "explicit" :
2487             "implicit", core_scsi3_pr_dump_type(pr_res_type),
2488             (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2489     }
2490     pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2491         tfo->fabric_name, se_nacl->initiatorname,
2492         i_buf);
2493     /*
2494      * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2495      */
2496     pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2497 }
2498
2499 static sense_reason_t
2500 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2501         u64 res_key)
2502 {
2503     struct se_device *dev = cmd->se_dev;
2504     struct se_session *se_sess = cmd->se_sess;
2505     struct se_lun *se_lun = cmd->se_lun;
2506     struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2507     struct t10_reservation *pr_tmpl = &dev->t10_pr;
2508     sense_reason_t ret = 0;
2509
2510     if (!se_sess || !se_lun) {
2511         pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2512         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2513     }
2514     /*
2515      * Locate the existing *pr_reg via struct se_node_acl pointers
2516      */
2517     pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2518     if (!pr_reg) {
2519         pr_err("SPC-3 PR: Unable to locate"
2520             " PR_REGISTERED *pr_reg for RELEASE\n");
2521         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2522     }
2523     /*
2524      * From spc4r17 Section 5.7.11.2 Releasing:
2525      *
2526      * If there is no persistent reservation or in response to a persistent
2527      * reservation release request from a registered I_T nexus that is not a
2528      * persistent reservation holder (see 5.7.10), the device server shall
2529      * do the following:
2530      *
2531      *     a) Not release the persistent reservation, if any;
2532      *     b) Not remove any registrations; and
2533      *     c) Complete the command with GOOD status.
2534      */
2535     spin_lock(&dev->dev_reservation_lock);
2536     pr_res_holder = dev->dev_pr_res_holder;
2537     if (!pr_res_holder) {
2538         /*
2539          * No persistent reservation, return GOOD status.
2540          */
2541         spin_unlock(&dev->dev_reservation_lock);
2542         goto out_put_pr_reg;
2543     }
2544
2545     if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2546         /*
2547          * Release request from a registered I_T nexus that is not a
2548          * persistent reservation holder. return GOOD status.
2549          */
2550         spin_unlock(&dev->dev_reservation_lock);
2551         goto out_put_pr_reg;
2552     }
2553
2554     /*
2555      * From spc4r17 Section 5.7.11.2 Releasing:
2556      *
2557      * Only the persistent reservation holder (see 5.7.10) is allowed to
2558      * release a persistent reservation.
2559      *
2560      * An application client releases the persistent reservation by issuing
2561      * a PERSISTENT RESERVE OUT command with RELEASE service action through
2562      * an I_T nexus that is a persistent reservation holder with the
2563      * following parameters:
2564      *
2565      *     a) RESERVATION KEY field set to the value of the reservation key
2566      *    that is registered with the logical unit for the I_T nexus;
2567      */
2568     if (res_key != pr_reg->pr_res_key) {
2569         pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2570             " does not match existing SA REGISTER res_key:"
2571             " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2572         spin_unlock(&dev->dev_reservation_lock);
2573         ret = TCM_RESERVATION_CONFLICT;
2574         goto out_put_pr_reg;
2575     }
2576     /*
2577      * From spc4r17 Section 5.7.11.2 Releasing and above:
2578      *
2579      * b) TYPE field and SCOPE field set to match the persistent
2580      *    reservation being released.
2581      */
2582     if ((pr_res_holder->pr_res_type != type) ||
2583         (pr_res_holder->pr_res_scope != scope)) {
2584         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2585         pr_err("SPC-3 PR RELEASE: Attempted to release"
2586             " reservation from [%s]: %s with different TYPE "
2587             "and/or SCOPE  while reservation already held by"
2588             " [%s]: %s, returning RESERVATION_CONFLICT\n",
2589             cmd->se_tfo->fabric_name,
2590             se_sess->se_node_acl->initiatorname,
2591             pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2592             pr_res_holder->pr_reg_nacl->initiatorname);
2593
2594         spin_unlock(&dev->dev_reservation_lock);
2595         ret = TCM_RESERVATION_CONFLICT;
2596         goto out_put_pr_reg;
2597     }
2598     /*
2599      * In response to a persistent reservation release request from the
2600      * persistent reservation holder the device server shall perform a
2601      * release by doing the following as an uninterrupted series of actions:
2602      * a) Release the persistent reservation;
2603      * b) Not remove any registration(s);
2604      * c) If the released persistent reservation is a registrants only type
2605      * or all registrants type persistent reservation,
2606      *    the device server shall establish a unit attention condition for
2607      *    the initiator port associated with every regis-
2608      *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2609      *    RESERVE OUT command with RELEASE service action was received,
2610      *    with the additional sense code set to RESERVATIONS RELEASED; and
2611      * d) If the persistent reservation is of any other type, the device
2612      *    server shall not establish a unit attention condition.
2613      */
2614     __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2615                       pr_reg, 1, 0);
2616
2617     spin_unlock(&dev->dev_reservation_lock);
2618
2619     if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2620         (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2621         (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2622         (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2623         /*
2624          * If no UNIT ATTENTION conditions will be established for
2625          * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2626          * go ahead and check for APTPL=1 update+write below
2627          */
2628         goto write_aptpl;
2629     }
2630
2631     spin_lock(&pr_tmpl->registration_lock);
2632     list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2633             pr_reg_list) {
2634         /*
2635          * Do not establish a UNIT ATTENTION condition
2636          * for the calling I_T Nexus
2637          */
2638         if (pr_reg_p == pr_reg)
2639             continue;
2640
2641         target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2642                 pr_reg_p->pr_res_mapped_lun,
2643                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2644     }
2645     spin_unlock(&pr_tmpl->registration_lock);
2646
2647 write_aptpl:
2648     if (pr_tmpl->pr_aptpl_active)
2649         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2650
2651 out_put_pr_reg:
2652     core_scsi3_put_pr_reg(pr_reg);
2653     return ret;
2654 }
2655
2656 static sense_reason_t
2657 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2658 {
2659     struct se_device *dev = cmd->se_dev;
2660     struct se_node_acl *pr_reg_nacl;
2661     struct se_session *se_sess = cmd->se_sess;
2662     struct t10_reservation *pr_tmpl = &dev->t10_pr;
2663     struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2664     u64 pr_res_mapped_lun = 0;
2665     int calling_it_nexus = 0;
2666     /*
2667      * Locate the existing *pr_reg via struct se_node_acl pointers
2668      */
2669     pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2670             se_sess->se_node_acl, se_sess);
2671     if (!pr_reg_n) {
2672         pr_err("SPC-3 PR: Unable to locate"
2673             " PR_REGISTERED *pr_reg for CLEAR\n");
2674         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2675     }
2676     /*
2677      * From spc4r17 section 5.7.11.6, Clearing:
2678      *
2679      * Any application client may release the persistent reservation and
2680      * remove all registrations from a device server by issuing a
2681      * PERSISTENT RESERVE OUT command with CLEAR service action through a
2682      * registered I_T nexus with the following parameter:
2683      *
2684      *  a) RESERVATION KEY field set to the value of the reservation key
2685      *     that is registered with the logical unit for the I_T nexus.
2686      */
2687     if (res_key != pr_reg_n->pr_res_key) {
2688         pr_err("SPC-3 PR REGISTER: Received"
2689             " res_key: 0x%016Lx does not match"
2690             " existing SA REGISTER res_key:"
2691             " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2692         core_scsi3_put_pr_reg(pr_reg_n);
2693         return TCM_RESERVATION_CONFLICT;
2694     }
2695     /*
2696      * a) Release the persistent reservation, if any;
2697      */
2698     spin_lock(&dev->dev_reservation_lock);
2699     pr_res_holder = dev->dev_pr_res_holder;
2700     if (pr_res_holder) {
2701         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2702         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2703                           pr_res_holder, 0, 0);
2704     }
2705     spin_unlock(&dev->dev_reservation_lock);
2706     /*
2707      * b) Remove all registration(s) (see spc4r17 5.7.7);
2708      */
2709     spin_lock(&pr_tmpl->registration_lock);
2710     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2711             &pr_tmpl->registration_list, pr_reg_list) {
2712
2713         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2714         pr_reg_nacl = pr_reg->pr_reg_nacl;
2715         pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2716         __core_scsi3_free_registration(dev, pr_reg, NULL,
2717                     calling_it_nexus);
2718         /*
2719          * e) Establish a unit attention condition for the initiator
2720          *    port associated with every registered I_T nexus other
2721          *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2722          *    command with CLEAR service action was received, with the
2723          *    additional sense code set to RESERVATIONS PREEMPTED.
2724          */
2725         if (!calling_it_nexus)
2726             target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2727                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2728     }
2729     spin_unlock(&pr_tmpl->registration_lock);
2730
2731     pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2732         cmd->se_tfo->fabric_name);
2733
2734     core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2735
2736     core_scsi3_pr_generation(dev);
2737     return 0;
2738 }
2739
2740 static void __core_scsi3_complete_pro_preempt(
2741     struct se_device *dev,
2742     struct t10_pr_registration *pr_reg,
2743     struct list_head *preempt_and_abort_list,
2744     int type,
2745     int scope,
2746     enum preempt_type preempt_type)
2747 {
2748     struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2749     const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2750     char i_buf[PR_REG_ISID_ID_LEN] = { };
2751
2752     lockdep_assert_held(&dev->dev_reservation_lock);
2753
2754     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2755     /*
2756      * Do an implicit RELEASE of the existing reservation.
2757      */
2758     if (dev->dev_pr_res_holder)
2759         __core_scsi3_complete_pro_release(dev, nacl,
2760                           dev->dev_pr_res_holder, 0, 0);
2761
2762     dev->dev_pr_res_holder = pr_reg;
2763     pr_reg->pr_res_holder = 1;
2764     pr_reg->pr_res_type = type;
2765     pr_reg->pr_res_scope = scope;
2766
2767     pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2768         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2769         tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2770         core_scsi3_pr_dump_type(type),
2771         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2772     pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2773         tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2774         nacl->initiatorname, i_buf);
2775     /*
2776      * For PREEMPT_AND_ABORT, add the preempting reservation's
2777      * struct t10_pr_registration to the list that will be compared
2778      * against received CDBs..
2779      */
2780     if (preempt_and_abort_list)
2781         list_add_tail(&pr_reg->pr_reg_abort_list,
2782                 preempt_and_abort_list);
2783 }
2784
2785 static void core_scsi3_release_preempt_and_abort(
2786     struct list_head *preempt_and_abort_list,
2787     struct t10_pr_registration *pr_reg_holder)
2788 {
2789     struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2790
2791     list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2792                 pr_reg_abort_list) {
2793
2794         list_del(&pr_reg->pr_reg_abort_list);
2795         if (pr_reg_holder == pr_reg)
2796             continue;
2797         if (pr_reg->pr_res_holder) {
2798             pr_warn("pr_reg->pr_res_holder still set\n");
2799             continue;
2800         }
2801
2802         pr_reg->pr_reg_deve = NULL;
2803         pr_reg->pr_reg_nacl = NULL;
2804         kmem_cache_free(t10_pr_reg_cache, pr_reg);
2805     }
2806 }
2807
2808 static sense_reason_t
2809 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2810         u64 sa_res_key, enum preempt_type preempt_type)
2811 {
2812     struct se_device *dev = cmd->se_dev;
2813     struct se_node_acl *pr_reg_nacl;
2814     struct se_session *se_sess = cmd->se_sess;
2815     LIST_HEAD(preempt_and_abort_list);
2816     struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2817     struct t10_reservation *pr_tmpl = &dev->t10_pr;
2818     u64 pr_res_mapped_lun = 0;
2819     int all_reg = 0, calling_it_nexus = 0;
2820     bool sa_res_key_unmatched = sa_res_key != 0;
2821     int prh_type = 0, prh_scope = 0;
2822
2823     if (!se_sess)
2824         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2825
2826     pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2827                 se_sess);
2828     if (!pr_reg_n) {
2829         pr_err("SPC-3 PR: Unable to locate"
2830             " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2831             (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2832         return TCM_RESERVATION_CONFLICT;
2833     }
2834     if (pr_reg_n->pr_res_key != res_key) {
2835         core_scsi3_put_pr_reg(pr_reg_n);
2836         return TCM_RESERVATION_CONFLICT;
2837     }
2838     if (scope != PR_SCOPE_LU_SCOPE) {
2839         pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2840         core_scsi3_put_pr_reg(pr_reg_n);
2841         return TCM_INVALID_PARAMETER_LIST;
2842     }
2843
2844     spin_lock(&dev->dev_reservation_lock);
2845     pr_res_holder = dev->dev_pr_res_holder;
2846     if (pr_res_holder &&
2847        ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2848         (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2849         all_reg = 1;
2850
2851     if (!all_reg && !sa_res_key) {
2852         spin_unlock(&dev->dev_reservation_lock);
2853         core_scsi3_put_pr_reg(pr_reg_n);
2854         return TCM_INVALID_PARAMETER_LIST;
2855     }
2856     /*
2857      * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2858      *
2859      * If the SERVICE ACTION RESERVATION KEY field does not identify a
2860      * persistent reservation holder or there is no persistent reservation
2861      * holder (i.e., there is no persistent reservation), then the device
2862      * server shall perform a preempt by doing the following in an
2863      * uninterrupted series of actions. (See below..)
2864      */
2865     if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2866         /*
2867          * No existing or SA Reservation Key matching reservations..
2868          *
2869          * PROUT SA PREEMPT with All Registrant type reservations are
2870          * allowed to be processed without a matching SA Reservation Key
2871          */
2872         spin_lock(&pr_tmpl->registration_lock);
2873         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2874                 &pr_tmpl->registration_list, pr_reg_list) {
2875             /*
2876              * Removing of registrations in non all registrants
2877              * type reservations without a matching SA reservation
2878              * key.
2879              *
2880              * a) Remove the registrations for all I_T nexuses
2881              *    specified by the SERVICE ACTION RESERVATION KEY
2882              *    field;
2883              * b) Ignore the contents of the SCOPE and TYPE fields;
2884              * c) Process tasks as defined in 5.7.1; and
2885              * d) Establish a unit attention condition for the
2886              *    initiator port associated with every I_T nexus
2887              *    that lost its registration other than the I_T
2888              *    nexus on which the PERSISTENT RESERVE OUT command
2889              *    was received, with the additional sense code set
2890              *    to REGISTRATIONS PREEMPTED.
2891              */
2892             if (!all_reg) {
2893                 if (pr_reg->pr_res_key != sa_res_key)
2894                     continue;
2895                 sa_res_key_unmatched = false;
2896
2897                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2898                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2899                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2900                 __core_scsi3_free_registration(dev, pr_reg,
2901                     (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2902                         NULL, calling_it_nexus);
2903             } else {
2904                 /*
2905                  * Case for any existing all registrants type
2906                  * reservation, follow logic in spc4r17 section
2907                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2908                  *
2909                  * For a ZERO SA Reservation key, release
2910                  * all other registrations and do an implicit
2911                  * release of active persistent reservation.
2912                  *
2913                  * For a non-ZERO SA Reservation key, only
2914                  * release the matching reservation key from
2915                  * registrations.
2916                  */
2917                 if ((sa_res_key) &&
2918                      (pr_reg->pr_res_key != sa_res_key))
2919                     continue;
2920                 sa_res_key_unmatched = false;
2921
2922                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2923                 if (calling_it_nexus)
2924                     continue;
2925
2926                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2927                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2928                 __core_scsi3_free_registration(dev, pr_reg,
2929                     (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2930                         NULL, 0);
2931             }
2932             if (!calling_it_nexus)
2933                 target_ua_allocate_lun(pr_reg_nacl,
2934                     pr_res_mapped_lun, 0x2A,
2935                     ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2936         }
2937         spin_unlock(&pr_tmpl->registration_lock);
2938         /*
2939          * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2940          * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2941          * RESERVATION KEY field to a value that does not match any
2942          * registered reservation key, then the device server shall
2943          * complete the command with RESERVATION CONFLICT status.
2944          */
2945         if (sa_res_key_unmatched) {
2946             spin_unlock(&dev->dev_reservation_lock);
2947             core_scsi3_put_pr_reg(pr_reg_n);
2948             return TCM_RESERVATION_CONFLICT;
2949         }
2950         /*
2951          * For an existing all registrants type reservation
2952          * with a zero SA rservation key, preempt the existing
2953          * reservation with the new PR type and scope.
2954          */
2955         if (pr_res_holder && all_reg && !(sa_res_key)) {
2956             __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2957                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2958                 type, scope, preempt_type);
2959
2960             if (preempt_type == PREEMPT_AND_ABORT)
2961                 core_scsi3_release_preempt_and_abort(
2962                     &preempt_and_abort_list, pr_reg_n);
2963         }
2964         spin_unlock(&dev->dev_reservation_lock);
2965
2966         if (pr_tmpl->pr_aptpl_active)
2967             core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2968
2969         core_scsi3_put_pr_reg(pr_reg_n);
2970         core_scsi3_pr_generation(cmd->se_dev);
2971         return 0;
2972     }
2973     /*
2974      * The PREEMPTing SA reservation key matches that of the
2975      * existing persistent reservation, first, we check if
2976      * we are preempting our own reservation.
2977      * From spc4r17, section 5.7.11.4.3 Preempting
2978      * persistent reservations and registration handling
2979      *
2980      * If an all registrants persistent reservation is not
2981      * present, it is not an error for the persistent
2982      * reservation holder to preempt itself (i.e., a
2983      * PERSISTENT RESERVE OUT with a PREEMPT service action
2984      * or a PREEMPT AND ABORT service action with the
2985      * SERVICE ACTION RESERVATION KEY value equal to the
2986      * persistent reservation holder's reservation key that
2987      * is received from the persistent reservation holder).
2988      * In that case, the device server shall establish the
2989      * new persistent reservation and maintain the
2990      * registration.
2991      */
2992     prh_type = pr_res_holder->pr_res_type;
2993     prh_scope = pr_res_holder->pr_res_scope;
2994     /*
2995      * If the SERVICE ACTION RESERVATION KEY field identifies a
2996      * persistent reservation holder (see 5.7.10), the device
2997      * server shall perform a preempt by doing the following as
2998      * an uninterrupted series of actions:
2999      *
3000      * a) Release the persistent reservation for the holder
3001      *    identified by the SERVICE ACTION RESERVATION KEY field;
3002      */
3003     if (pr_reg_n != pr_res_holder)
3004         __core_scsi3_complete_pro_release(dev,
3005                           pr_res_holder->pr_reg_nacl,
3006                           dev->dev_pr_res_holder, 0, 0);
3007     /*
3008      * b) Remove the registrations for all I_T nexuses identified
3009      *    by the SERVICE ACTION RESERVATION KEY field, except the
3010      *    I_T nexus that is being used for the PERSISTENT RESERVE
3011      *    OUT command. If an all registrants persistent reservation
3012      *    is present and the SERVICE ACTION RESERVATION KEY field
3013      *    is set to zero, then all registrations shall be removed
3014      *    except for that of the I_T nexus that is being used for
3015      *    the PERSISTENT RESERVE OUT command;
3016      */
3017     spin_lock(&pr_tmpl->registration_lock);
3018     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3019             &pr_tmpl->registration_list, pr_reg_list) {
3020
3021         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3022         if (calling_it_nexus)
3023             continue;
3024
3025         if (pr_reg->pr_res_key != sa_res_key)
3026             continue;
3027
3028         pr_reg_nacl = pr_reg->pr_reg_nacl;
3029         pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3030         __core_scsi3_free_registration(dev, pr_reg,
3031                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3032                 calling_it_nexus);
3033         /*
3034          * e) Establish a unit attention condition for the initiator
3035          *    port associated with every I_T nexus that lost its
3036          *    persistent reservation and/or registration, with the
3037          *    additional sense code set to REGISTRATIONS PREEMPTED;
3038          */
3039         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3040                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3041     }
3042     spin_unlock(&pr_tmpl->registration_lock);
3043     /*
3044      * c) Establish a persistent reservation for the preempting
3045      *    I_T nexus using the contents of the SCOPE and TYPE fields;
3046      */
3047     __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3048             (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3049             type, scope, preempt_type);
3050     /*
3051      * d) Process tasks as defined in 5.7.1;
3052      * e) See above..
3053      * f) If the type or scope has changed, then for every I_T nexus
3054      *    whose reservation key was not removed, except for the I_T
3055      *    nexus on which the PERSISTENT RESERVE OUT command was
3056      *    received, the device server shall establish a unit
3057      *    attention condition for the initiator port associated with
3058      *    that I_T nexus, with the additional sense code set to
3059      *    RESERVATIONS RELEASED. If the type or scope have not
3060      *    changed, then no unit attention condition(s) shall be
3061      *    established for this reason.
3062      */
3063     if ((prh_type != type) || (prh_scope != scope)) {
3064         spin_lock(&pr_tmpl->registration_lock);
3065         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3066                 &pr_tmpl->registration_list, pr_reg_list) {
3067
3068             calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3069             if (calling_it_nexus)
3070                 continue;
3071
3072             target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3073                     pr_reg->pr_res_mapped_lun, 0x2A,
3074                     ASCQ_2AH_RESERVATIONS_RELEASED);
3075         }
3076         spin_unlock(&pr_tmpl->registration_lock);
3077     }
3078     spin_unlock(&dev->dev_reservation_lock);
3079     /*
3080      * Call LUN_RESET logic upon list of struct t10_pr_registration,
3081      * All received CDBs for the matching existing reservation and
3082      * registrations undergo ABORT_TASK logic.
3083      *
3084      * From there, core_scsi3_release_preempt_and_abort() will
3085      * release every registration in the list (which have already
3086      * been removed from the primary pr_reg list), except the
3087      * new persistent reservation holder, the calling Initiator Port.
3088      */
3089     if (preempt_type == PREEMPT_AND_ABORT) {
3090         core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3091         core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3092                         pr_reg_n);
3093     }
3094
3095     if (pr_tmpl->pr_aptpl_active)
3096         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3097
3098     core_scsi3_put_pr_reg(pr_reg_n);
3099     core_scsi3_pr_generation(cmd->se_dev);
3100     return 0;
3101 }
3102
3103 static sense_reason_t
3104 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3105         u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3106 {
3107     switch (type) {
3108     case PR_TYPE_WRITE_EXCLUSIVE:
3109     case PR_TYPE_EXCLUSIVE_ACCESS:
3110     case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3111     case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3112     case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3113     case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3114         return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3115                           sa_res_key, preempt_type);
3116     default:
3117         pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3118             " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3119         return TCM_INVALID_CDB_FIELD;
3120     }
3121 }
3122
3123
3124 static sense_reason_t
3125 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3126         u64 sa_res_key, int aptpl, int unreg)
3127 {
3128     struct se_session *se_sess = cmd->se_sess;
3129     struct se_device *dev = cmd->se_dev;
3130     struct se_dev_entry *dest_se_deve = NULL;
3131     struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3132     struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3133     struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3134     const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3135     struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3136     struct t10_reservation *pr_tmpl = &dev->t10_pr;
3137     unsigned char *buf;
3138     const unsigned char *initiator_str;
3139     char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
3140     u32 tid_len, tmp_tid_len;
3141     int new_reg = 0, type, scope, matching_iname;
3142     sense_reason_t ret;
3143     unsigned short rtpi;
3144     unsigned char proto_ident;
3145
3146     if (!se_sess || !se_lun) {
3147         pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3148         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3149     }
3150
3151     se_tpg = se_sess->se_tpg;
3152     tf_ops = se_tpg->se_tpg_tfo;
3153     /*
3154      * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3155      *  Register behaviors for a REGISTER AND MOVE service action
3156      *
3157      * Locate the existing *pr_reg via struct se_node_acl pointers
3158      */
3159     pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3160                 se_sess);
3161     if (!pr_reg) {
3162         pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3163             " *pr_reg for REGISTER_AND_MOVE\n");
3164         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3165     }
3166     /*
3167      * The provided reservation key much match the existing reservation key
3168      * provided during this initiator's I_T nexus registration.
3169      */
3170     if (res_key != pr_reg->pr_res_key) {
3171         pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3172             " res_key: 0x%016Lx does not match existing SA REGISTER"
3173             " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3174         ret = TCM_RESERVATION_CONFLICT;
3175         goto out_put_pr_reg;
3176     }
3177     /*
3178      * The service active reservation key needs to be non zero
3179      */
3180     if (!sa_res_key) {
3181         pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3182             " sa_res_key\n");
3183         ret = TCM_INVALID_PARAMETER_LIST;
3184         goto out_put_pr_reg;
3185     }
3186
3187     /*
3188      * Determine the Relative Target Port Identifier where the reservation
3189      * will be moved to for the TransportID containing SCSI initiator WWN
3190      * information.
3191      */
3192     buf = transport_kmap_data_sg(cmd);
3193     if (!buf) {
3194         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3195         goto out_put_pr_reg;
3196     }
3197
3198     rtpi = get_unaligned_be16(&buf[18]);
3199     tid_len = get_unaligned_be32(&buf[20]);
3200     transport_kunmap_data_sg(cmd);
3201     buf = NULL;
3202
3203     if ((tid_len + 24) != cmd->data_length) {
3204         pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3205             " does not equal CDB data_length: %u\n", tid_len,
3206             cmd->data_length);
3207         ret = TCM_INVALID_PARAMETER_LIST;
3208         goto out_put_pr_reg;
3209     }
3210
3211     spin_lock(&dev->se_port_lock);
3212     list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3213         if (tmp_lun->lun_rtpi != rtpi)
3214             continue;
3215         dest_se_tpg = tmp_lun->lun_tpg;
3216         dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3217         if (!dest_tf_ops)
3218             continue;
3219
3220         atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3221         spin_unlock(&dev->se_port_lock);
3222
3223         if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3224             pr_err("core_scsi3_tpg_depend_item() failed"
3225                 " for dest_se_tpg\n");
3226             atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3227             ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3228             goto out_put_pr_reg;
3229         }
3230
3231         spin_lock(&dev->se_port_lock);
3232         break;
3233     }
3234     spin_unlock(&dev->se_port_lock);
3235
3236     if (!dest_se_tpg || !dest_tf_ops) {
3237         pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3238             " fabric ops from Relative Target Port Identifier:"
3239             " %hu\n", rtpi);
3240         ret = TCM_INVALID_PARAMETER_LIST;
3241         goto out_put_pr_reg;
3242     }
3243
3244     buf = transport_kmap_data_sg(cmd);
3245     if (!buf) {
3246         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3247         goto out_put_pr_reg;
3248     }
3249     proto_ident = (buf[24] & 0x0f);
3250
3251     pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3252             " 0x%02x\n", proto_ident);
3253
3254     if (proto_ident != dest_se_tpg->proto_id) {
3255         pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3256             " proto_ident: 0x%02x does not match ident: 0x%02x"
3257             " from fabric: %s\n", proto_ident,
3258             dest_se_tpg->proto_id,
3259             dest_tf_ops->fabric_name);
3260         ret = TCM_INVALID_PARAMETER_LIST;
3261         goto out;
3262     }
3263     initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3264             &buf[24], &tmp_tid_len, &iport_ptr);
3265     if (!initiator_str) {
3266         pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3267             " initiator_str from Transport ID\n");
3268         ret = TCM_INVALID_PARAMETER_LIST;
3269         goto out;
3270     }
3271
3272     transport_kunmap_data_sg(cmd);
3273     buf = NULL;
3274
3275     pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3276         " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?
3277         "port" : "device", initiator_str, (iport_ptr != NULL) ?
3278         iport_ptr : "");
3279     /*
3280      * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3281      * action specifies a TransportID that is the same as the initiator port
3282      * of the I_T nexus for the command received, then the command shall
3283      * be terminated with CHECK CONDITION status, with the sense key set to
3284      * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3285      * IN PARAMETER LIST.
3286      */
3287     pr_reg_nacl = pr_reg->pr_reg_nacl;
3288     matching_iname = (!strcmp(initiator_str,
3289                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3290     if (!matching_iname)
3291         goto after_iport_check;
3292
3293     if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3294         pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3295             " matches: %s on received I_T Nexus\n", initiator_str,
3296             pr_reg_nacl->initiatorname);
3297         ret = TCM_INVALID_PARAMETER_LIST;
3298         goto out;
3299     }
3300     if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3301         pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3302             " matches: %s %s on received I_T Nexus\n",
3303             initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3304             pr_reg->pr_reg_isid);
3305         ret = TCM_INVALID_PARAMETER_LIST;
3306         goto out;
3307     }
3308 after_iport_check:
3309     /*
3310      * Locate the destination struct se_node_acl from the received Transport ID
3311      */
3312     mutex_lock(&dest_se_tpg->acl_node_mutex);
3313     dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3314                 initiator_str);
3315     if (dest_node_acl)
3316         atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3317     mutex_unlock(&dest_se_tpg->acl_node_mutex);
3318
3319     if (!dest_node_acl) {
3320         pr_err("Unable to locate %s dest_node_acl for"
3321             " TransportID%s\n", dest_tf_ops->fabric_name,
3322             initiator_str);
3323         ret = TCM_INVALID_PARAMETER_LIST;
3324         goto out;
3325     }
3326
3327     if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3328         pr_err("core_scsi3_nodeacl_depend_item() for"
3329             " dest_node_acl\n");
3330         atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3331         dest_node_acl = NULL;
3332         ret = TCM_INVALID_PARAMETER_LIST;
3333         goto out;
3334     }
3335
3336     pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3337         " %s from TransportID\n", dest_tf_ops->fabric_name,
3338         dest_node_acl->initiatorname);
3339
3340     /*
3341      * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3342      * PORT IDENTIFIER.
3343      */
3344     dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3345     if (!dest_se_deve) {
3346         pr_err("Unable to locate %s dest_se_deve from RTPI:"
3347             " %hu\n",  dest_tf_ops->fabric_name, rtpi);
3348         ret = TCM_INVALID_PARAMETER_LIST;
3349         goto out;
3350     }
3351
3352     if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3353         pr_err("core_scsi3_lunacl_depend_item() failed\n");
3354         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3355         dest_se_deve = NULL;
3356         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3357         goto out;
3358     }
3359
3360     pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3361         " ACL for dest_se_deve->mapped_lun: %llu\n",
3362         dest_tf_ops->fabric_name, dest_node_acl->initiatorname,
3363         dest_se_deve->mapped_lun);
3364
3365     /*
3366      * A persistent reservation needs to already existing in order to
3367      * successfully complete the REGISTER_AND_MOVE service action..
3368      */
3369     spin_lock(&dev->dev_reservation_lock);
3370     pr_res_holder = dev->dev_pr_res_holder;
3371     if (!pr_res_holder) {
3372         pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3373             " currently held\n");
3374         spin_unlock(&dev->dev_reservation_lock);
3375         ret = TCM_INVALID_CDB_FIELD;
3376         goto out;
3377     }
3378     /*
3379      * The received on I_T Nexus must be the reservation holder.
3380      *
3381      * From spc4r17 section 5.7.8  Table 50 --
3382      *  Register behaviors for a REGISTER AND MOVE service action
3383      */
3384     if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3385         pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3386             " Nexus is not reservation holder\n");
3387         spin_unlock(&dev->dev_reservation_lock);
3388         ret = TCM_RESERVATION_CONFLICT;
3389         goto out;
3390     }
3391     /*
3392      * From spc4r17 section 5.7.8: registering and moving reservation
3393      *
3394      * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3395      * action is received and the established persistent reservation is a
3396      * Write Exclusive - All Registrants type or Exclusive Access -
3397      * All Registrants type reservation, then the command shall be completed
3398      * with RESERVATION CONFLICT status.
3399      */
3400     if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3401         (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3402         pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3403             " reservation for type: %s\n",
3404             core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3405         spin_unlock(&dev->dev_reservation_lock);
3406         ret = TCM_RESERVATION_CONFLICT;
3407         goto out;
3408     }
3409     pr_res_nacl = pr_res_holder->pr_reg_nacl;
3410     /*
3411      * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3412      */
3413     type = pr_res_holder->pr_res_type;
3414     scope = pr_res_holder->pr_res_type;
3415     /*
3416      * c) Associate the reservation key specified in the SERVICE ACTION
3417      *    RESERVATION KEY field with the I_T nexus specified as the
3418      *    destination of the register and move, where:
3419      *    A) The I_T nexus is specified by the TransportID and the
3420      *   RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3421      *    B) Regardless of the TransportID format used, the association for
3422      *       the initiator port is based on either the initiator port name
3423      *       (see 3.1.71) on SCSI transport protocols where port names are
3424      *       required or the initiator port identifier (see 3.1.70) on SCSI
3425      *       transport protocols where port names are not required;
3426      * d) Register the reservation key specified in the SERVICE ACTION
3427      *    RESERVATION KEY field;
3428      * e) Retain the reservation key specified in the SERVICE ACTION
3429      *    RESERVATION KEY field and associated information;
3430      *
3431      * Also, It is not an error for a REGISTER AND MOVE service action to
3432      * register an I_T nexus that is already registered with the same
3433      * reservation key or a different reservation key.
3434      */
3435     dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3436                     iport_ptr);
3437     if (!dest_pr_reg) {
3438         struct se_lun *dest_lun = dest_se_deve->se_lun;
3439
3440         spin_unlock(&dev->dev_reservation_lock);
3441         if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3442                     dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3443                     iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3444             ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3445             goto out;
3446         }
3447         spin_lock(&dev->dev_reservation_lock);
3448         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3449                         iport_ptr);
3450         new_reg = 1;
3451     }
3452     /*
3453      * f) Release the persistent reservation for the persistent reservation
3454      *    holder (i.e., the I_T nexus on which the
3455      */
3456     __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3457                       dev->dev_pr_res_holder, 0, 0);
3458     /*
3459      * g) Move the persistent reservation to the specified I_T nexus using
3460      *    the same scope and type as the persistent reservation released in
3461      *    item f); and
3462      */
3463     dev->dev_pr_res_holder = dest_pr_reg;
3464     dest_pr_reg->pr_res_holder = 1;
3465     dest_pr_reg->pr_res_type = type;
3466     pr_reg->pr_res_scope = scope;
3467     core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3468     /*
3469      * Increment PRGeneration for existing registrations..
3470      */
3471     if (!new_reg)
3472         dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3473     spin_unlock(&dev->dev_reservation_lock);
3474
3475     pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3476         " created new reservation holder TYPE: %s on object RTPI:"
3477         " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,
3478         core_scsi3_pr_dump_type(type), rtpi,
3479         dest_pr_reg->pr_res_generation);
3480     pr_debug("SPC-3 PR Successfully moved reservation from"
3481         " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3482         tf_ops->fabric_name, pr_reg_nacl->initiatorname,
3483         i_buf, dest_tf_ops->fabric_name,
3484         dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3485         iport_ptr : "");
3486     /*
3487      * It is now safe to release configfs group dependencies for destination
3488      * of Transport ID Initiator Device/Port Identifier
3489      */
3490     core_scsi3_lunacl_undepend_item(dest_se_deve);
3491     core_scsi3_nodeacl_undepend_item(dest_node_acl);
3492     core_scsi3_tpg_undepend_item(dest_se_tpg);
3493     /*
3494      * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3495      * nexus on which PERSISTENT RESERVE OUT command was received.
3496      */
3497     if (unreg) {
3498         spin_lock(&pr_tmpl->registration_lock);
3499         __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3500         spin_unlock(&pr_tmpl->registration_lock);
3501     } else
3502         core_scsi3_put_pr_reg(pr_reg);
3503
3504     core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3505
3506     core_scsi3_put_pr_reg(dest_pr_reg);
3507     return 0;
3508 out:
3509     if (buf)
3510         transport_kunmap_data_sg(cmd);
3511     if (dest_se_deve)
3512         core_scsi3_lunacl_undepend_item(dest_se_deve);
3513     if (dest_node_acl)
3514         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3515     core_scsi3_tpg_undepend_item(dest_se_tpg);
3516
3517 out_put_pr_reg:
3518     core_scsi3_put_pr_reg(pr_reg);
3519     return ret;
3520 }
3521
3522 /*
3523  * See spc4r17 section 6.14 Table 170
3524  */
3525 sense_reason_t
3526 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3527 {
3528     struct se_device *dev = cmd->se_dev;
3529     unsigned char *cdb = &cmd->t_task_cdb[0];
3530     unsigned char *buf;
3531     u64 res_key, sa_res_key;
3532     int sa, scope, type, aptpl;
3533     int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3534     sense_reason_t ret;
3535
3536     /*
3537      * Following spc2r20 5.5.1 Reservations overview:
3538      *
3539      * If a logical unit has been reserved by any RESERVE command and is
3540      * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3541      * PERSISTENT RESERVE OUT commands shall conflict regardless of
3542      * initiator or service action and shall terminate with a RESERVATION
3543      * CONFLICT status.
3544      */
3545     if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3546         pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3547             " SPC-2 reservation is held, returning"
3548             " RESERVATION_CONFLICT\n");
3549         return TCM_RESERVATION_CONFLICT;
3550     }
3551
3552     /*
3553      * FIXME: A NULL struct se_session pointer means an this is not coming from
3554      * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3555      */
3556     if (!cmd->se_sess)
3557         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3558
3559     if (cmd->data_length < 24) {
3560         pr_warn("SPC-PR: Received PR OUT parameter list"
3561             " length too small: %u\n", cmd->data_length);
3562         return TCM_PARAMETER_LIST_LENGTH_ERROR;
3563     }
3564
3565     /*
3566      * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3567      */
3568     sa = (cdb[1] & 0x1f);
3569     scope = (cdb[2] & 0xf0);
3570     type = (cdb[2] & 0x0f);
3571
3572     buf = transport_kmap_data_sg(cmd);
3573     if (!buf)
3574         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3575
3576     /*
3577      * From PERSISTENT_RESERVE_OUT parameter list (payload)
3578      */
3579     res_key = get_unaligned_be64(&buf[0]);
3580     sa_res_key = get_unaligned_be64(&buf[8]);
3581     /*
3582      * REGISTER_AND_MOVE uses a different SA parameter list containing
3583      * SCSI TransportIDs.
3584      */
3585     if (sa != PRO_REGISTER_AND_MOVE) {
3586         spec_i_pt = (buf[20] & 0x08);
3587         all_tg_pt = (buf[20] & 0x04);
3588         aptpl = (buf[20] & 0x01);
3589     } else {
3590         aptpl = (buf[17] & 0x01);
3591         unreg = (buf[17] & 0x02);
3592     }
3593     /*
3594      * If the backend device has been configured to force APTPL metadata
3595      * write-out, go ahead and propigate aptpl=1 down now.
3596      */
3597     if (dev->dev_attrib.force_pr_aptpl)
3598         aptpl = 1;
3599
3600     transport_kunmap_data_sg(cmd);
3601     buf = NULL;
3602
3603     /*
3604      * SPEC_I_PT=1 is only valid for Service action: REGISTER
3605      */
3606     if (spec_i_pt && (sa != PRO_REGISTER))
3607         return TCM_INVALID_PARAMETER_LIST;
3608
3609     /*
3610      * From spc4r17 section 6.14:
3611      *
3612      * If the SPEC_I_PT bit is set to zero, the service action is not
3613      * REGISTER AND MOVE, and the parameter list length is not 24, then
3614      * the command shall be terminated with CHECK CONDITION status, with
3615      * the sense key set to ILLEGAL REQUEST, and the additional sense
3616      * code set to PARAMETER LIST LENGTH ERROR.
3617      */
3618     if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
3619         (cmd->data_length != 24)) {
3620         pr_warn("SPC-PR: Received PR OUT illegal parameter"
3621             " list length: %u\n", cmd->data_length);
3622         return TCM_PARAMETER_LIST_LENGTH_ERROR;
3623     }
3624
3625     /*
3626      * (core_scsi3_emulate_pro_* function parameters
3627      * are defined by spc4r17 Table 174:
3628      * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3629      */
3630     switch (sa) {
3631     case PRO_REGISTER:
3632         ret = core_scsi3_emulate_pro_register(cmd,
3633             res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3634         break;
3635     case PRO_RESERVE:
3636         ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3637         break;
3638     case PRO_RELEASE:
3639         ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3640         break;
3641     case PRO_CLEAR:
3642         ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3643         break;
3644     case PRO_PREEMPT:
3645         ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3646                     res_key, sa_res_key, PREEMPT);
3647         break;
3648     case PRO_PREEMPT_AND_ABORT:
3649         ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3650                     res_key, sa_res_key, PREEMPT_AND_ABORT);
3651         break;
3652     case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3653         ret = core_scsi3_emulate_pro_register(cmd,
3654             0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3655         break;
3656     case PRO_REGISTER_AND_MOVE:
3657         ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3658                 sa_res_key, aptpl, unreg);
3659         break;
3660     default:
3661         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3662             " action: 0x%02x\n", sa);
3663         return TCM_INVALID_CDB_FIELD;
3664     }
3665
3666     if (!ret)
3667         target_complete_cmd(cmd, SAM_STAT_GOOD);
3668     return ret;
3669 }
3670
3671 /*
3672  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3673  *
3674  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3675  */
3676 static sense_reason_t
3677 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3678 {
3679     struct se_device *dev = cmd->se_dev;
3680     struct t10_pr_registration *pr_reg;
3681     unsigned char *buf;
3682     u32 add_len = 0, off = 8;
3683
3684     if (cmd->data_length < 8) {
3685         pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3686             " too small\n", cmd->data_length);
3687         return TCM_INVALID_CDB_FIELD;
3688     }
3689
3690     buf = transport_kmap_data_sg(cmd);
3691     if (!buf)
3692         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3693
3694     put_unaligned_be32(dev->t10_pr.pr_generation, buf);
3695
3696     spin_lock(&dev->t10_pr.registration_lock);
3697     list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3698             pr_reg_list) {
3699         /*
3700          * Check for overflow of 8byte PRI READ_KEYS payload and
3701          * next reservation key list descriptor.
3702          */
3703         if (off + 8 <= cmd->data_length) {
3704             put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3705             off += 8;
3706         }
3707         /*
3708          * SPC5r17: 6.16.2 READ KEYS service action
3709          * The ADDITIONAL LENGTH field indicates the number of bytes in
3710          * the Reservation key list. The contents of the ADDITIONAL
3711          * LENGTH field are not altered based on the allocation length
3712          */
3713         add_len += 8;
3714     }
3715     spin_unlock(&dev->t10_pr.registration_lock);
3716
3717     put_unaligned_be32(add_len, &buf[4]);
3718     target_set_cmd_data_length(cmd, 8 + add_len);
3719
3720     transport_kunmap_data_sg(cmd);
3721
3722     return 0;
3723 }
3724
3725 /*
3726  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3727  *
3728  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3729  */
3730 static sense_reason_t
3731 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3732 {
3733     struct se_device *dev = cmd->se_dev;
3734     struct t10_pr_registration *pr_reg;
3735     unsigned char *buf;
3736     u64 pr_res_key;
3737     u32 add_len = 0;
3738
3739     if (cmd->data_length < 8) {
3740         pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3741             " too small\n", cmd->data_length);
3742         return TCM_INVALID_CDB_FIELD;
3743     }
3744
3745     buf = transport_kmap_data_sg(cmd);
3746     if (!buf)
3747         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3748
3749     put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3750
3751     spin_lock(&dev->dev_reservation_lock);
3752     pr_reg = dev->dev_pr_res_holder;
3753     if (pr_reg) {
3754         /*
3755          * Set the Additional Length to 16 when a reservation is held
3756          */
3757         add_len = 16;
3758         put_unaligned_be32(add_len, &buf[4]);
3759
3760         if (cmd->data_length < 22)
3761             goto err;
3762
3763         /*
3764          * Set the Reservation key.
3765          *
3766          * From spc4r17, section 5.7.10:
3767          * A persistent reservation holder has its reservation key
3768          * returned in the parameter data from a PERSISTENT
3769          * RESERVE IN command with READ RESERVATION service action as
3770          * follows:
3771          * a) For a persistent reservation of the type Write Exclusive
3772          *    - All Registrants or Exclusive Access  All Regitrants,
3773          *      the reservation key shall be set to zero; or
3774          * b) For all other persistent reservation types, the
3775          *    reservation key shall be set to the registered
3776          *    reservation key for the I_T nexus that holds the
3777          *    persistent reservation.
3778          */
3779         if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3780             (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3781             pr_res_key = 0;
3782         else
3783             pr_res_key = pr_reg->pr_res_key;
3784
3785         put_unaligned_be64(pr_res_key, &buf[8]);
3786         /*
3787          * Set the SCOPE and TYPE
3788          */
3789         buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3790               (pr_reg->pr_res_type & 0x0f);
3791     }
3792
3793     target_set_cmd_data_length(cmd, 8 + add_len);
3794
3795 err:
3796     spin_unlock(&dev->dev_reservation_lock);
3797     transport_kunmap_data_sg(cmd);
3798
3799     return 0;
3800 }
3801
3802 /*
3803  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3804  *
3805  * See spc4r17 section 6.13.4 Table 165
3806  */
3807 static sense_reason_t
3808 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3809 {
3810     struct se_device *dev = cmd->se_dev;
3811     struct t10_reservation *pr_tmpl = &dev->t10_pr;
3812     unsigned char *buf;
3813     u16 len = 8; /* Hardcoded to 8. */
3814
3815     if (cmd->data_length < 6) {
3816         pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3817             " %u too small\n", cmd->data_length);
3818         return TCM_INVALID_CDB_FIELD;
3819     }
3820
3821     buf = transport_kmap_data_sg(cmd);
3822     if (!buf)
3823         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3824
3825     put_unaligned_be16(len, &buf[0]);
3826     buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3827     buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3828     buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3829     buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3830     /*
3831      * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3832      * set the TMV: Task Mask Valid bit.
3833      */
3834     buf[3] |= 0x80;
3835     /*
3836      * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3837      */
3838     buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3839     /*
3840      * PTPL_A: Persistence across Target Power Loss Active bit
3841      */
3842     if (pr_tmpl->pr_aptpl_active)
3843         buf[3] |= 0x01;
3844     /*
3845      * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3846      */
3847     buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3848     buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3849     buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3850     buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3851     buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3852     buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3853
3854     target_set_cmd_data_length(cmd, len);
3855
3856     transport_kunmap_data_sg(cmd);
3857
3858     return 0;
3859 }
3860
3861 /*
3862  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3863  *
3864  * See spc4r17 section 6.13.5 Table 168 and 169
3865  */
3866 static sense_reason_t
3867 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3868 {
3869     struct se_device *dev = cmd->se_dev;
3870     struct se_node_acl *se_nacl;
3871     struct se_portal_group *se_tpg;
3872     struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3873     struct t10_reservation *pr_tmpl = &dev->t10_pr;
3874     unsigned char *buf;
3875     u32 add_desc_len = 0, add_len = 0;
3876     u32 off = 8; /* off into first Full Status descriptor */
3877     int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3878     int exp_desc_len, desc_len;
3879     bool all_reg = false;
3880
3881     if (cmd->data_length < 8) {
3882         pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3883             " too small\n", cmd->data_length);
3884         return TCM_INVALID_CDB_FIELD;
3885     }
3886
3887     buf = transport_kmap_data_sg(cmd);
3888     if (!buf)
3889         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3890
3891     put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3892
3893     spin_lock(&dev->dev_reservation_lock);
3894     if (dev->dev_pr_res_holder) {
3895         struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3896
3897         if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3898             pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3899             all_reg = true;
3900             pr_res_type = pr_holder->pr_res_type;
3901             pr_res_scope = pr_holder->pr_res_scope;
3902         }
3903     }
3904     spin_unlock(&dev->dev_reservation_lock);
3905
3906     spin_lock(&pr_tmpl->registration_lock);
3907     list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3908             &pr_tmpl->registration_list, pr_reg_list) {
3909
3910         se_nacl = pr_reg->pr_reg_nacl;
3911         se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3912         add_desc_len = 0;
3913
3914         atomic_inc_mb(&pr_reg->pr_res_holders);
3915         spin_unlock(&pr_tmpl->registration_lock);
3916         /*
3917          * Determine expected length of $FABRIC_MOD specific
3918          * TransportID full status descriptor..
3919          */
3920         exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3921                     &format_code);
3922         if (exp_desc_len < 0 ||
3923             exp_desc_len + add_len > cmd->data_length) {
3924             pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3925                 " out of buffer: %d\n", cmd->data_length);
3926             spin_lock(&pr_tmpl->registration_lock);
3927             atomic_dec_mb(&pr_reg->pr_res_holders);
3928             break;
3929         }
3930         /*
3931          * Set RESERVATION KEY
3932          */
3933         put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3934         off += 8;
3935         off += 4; /* Skip Over Reserved area */
3936
3937         /*
3938          * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3939          */
3940         if (pr_reg->pr_reg_all_tg_pt)
3941             buf[off] = 0x02;
3942         /*
3943          * The struct se_lun pointer will be present for the
3944          * reservation holder for PR_HOLDER bit.
3945          *
3946          * Also, if this registration is the reservation
3947          * holder or there is an All Registrants reservation
3948          * active, fill in SCOPE and TYPE in the next byte.
3949          */
3950         if (pr_reg->pr_res_holder) {
3951             buf[off++] |= 0x01;
3952             buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3953                      (pr_reg->pr_res_type & 0x0f);
3954         } else if (all_reg) {
3955             buf[off++] |= 0x01;
3956             buf[off++] = (pr_res_scope & 0xf0) |
3957                      (pr_res_type & 0x0f);
3958         } else {
3959             off += 2;
3960         }
3961
3962         off += 4; /* Skip over reserved area */
3963         /*
3964          * From spc4r17 6.3.15:
3965          *
3966          * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3967          * IDENTIFIER field contains the relative port identifier (see
3968          * 3.1.120) of the target port that is part of the I_T nexus
3969          * described by this full status descriptor. If the ALL_TG_PT
3970          * bit is set to one, the contents of the RELATIVE TARGET PORT
3971          * IDENTIFIER field are not defined by this standard.
3972          */
3973         if (!pr_reg->pr_reg_all_tg_pt) {
3974             u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
3975
3976             put_unaligned_be16(sep_rtpi, &buf[off]);
3977             off += 2;
3978         } else
3979             off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
3980
3981         buf[off+4] = se_tpg->proto_id;
3982
3983         /*
3984          * Now, have the $FABRIC_MOD fill in the transport ID.
3985          */
3986         desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
3987                 &format_code, &buf[off+4]);
3988
3989         spin_lock(&pr_tmpl->registration_lock);
3990         atomic_dec_mb(&pr_reg->pr_res_holders);
3991
3992         if (desc_len < 0)
3993             break;
3994         /*
3995          * Set the ADDITIONAL DESCRIPTOR LENGTH
3996          */
3997         put_unaligned_be32(desc_len, &buf[off]);
3998         off += 4;
3999         /*
4000          * Size of full desctipor header minus TransportID
4001          * containing $FABRIC_MOD specific) initiator device/port
4002          * WWN information.
4003          *
4004          *  See spc4r17 Section 6.13.5 Table 169
4005          */
4006         add_desc_len = (24 + desc_len);
4007
4008         off += desc_len;
4009         add_len += add_desc_len;
4010     }
4011     spin_unlock(&pr_tmpl->registration_lock);
4012     /*
4013      * Set ADDITIONAL_LENGTH
4014      */
4015     put_unaligned_be32(add_len, &buf[4]);
4016     target_set_cmd_data_length(cmd, 8 + add_len);
4017
4018     transport_kunmap_data_sg(cmd);
4019
4020     return 0;
4021 }
4022
4023 sense_reason_t
4024 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4025 {
4026     sense_reason_t ret;
4027
4028     /*
4029      * Following spc2r20 5.5.1 Reservations overview:
4030      *
4031      * If a logical unit has been reserved by any RESERVE command and is
4032      * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4033      * PERSISTENT RESERVE OUT commands shall conflict regardless of
4034      * initiator or service action and shall terminate with a RESERVATION
4035      * CONFLICT status.
4036      */
4037     if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4038         pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4039             " SPC-2 reservation is held, returning"
4040             " RESERVATION_CONFLICT\n");
4041         return TCM_RESERVATION_CONFLICT;
4042     }
4043
4044     switch (cmd->t_task_cdb[1] & 0x1f) {
4045     case PRI_READ_KEYS:
4046         ret = core_scsi3_pri_read_keys(cmd);
4047         break;
4048     case PRI_READ_RESERVATION:
4049         ret = core_scsi3_pri_read_reservation(cmd);
4050         break;
4051     case PRI_REPORT_CAPABILITIES:
4052         ret = core_scsi3_pri_report_capabilities(cmd);
4053         break;
4054     case PRI_READ_FULL_STATUS:
4055         ret = core_scsi3_pri_read_full_status(cmd);
4056         break;
4057     default:
4058         pr_err("Unknown PERSISTENT_RESERVE_IN service"
4059             " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4060         return TCM_INVALID_CDB_FIELD;
4061     }
4062
4063     if (!ret)
4064         target_complete_cmd(cmd, SAM_STAT_GOOD);
4065     return ret;
4066 }
4067
4068 sense_reason_t
4069 target_check_reservation(struct se_cmd *cmd)
4070 {
4071     struct se_device *dev = cmd->se_dev;
4072     sense_reason_t ret;
4073
4074     if (!cmd->se_sess)
4075         return 0;
4076     if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4077         return 0;
4078     if (!dev->dev_attrib.emulate_pr)
4079         return 0;
4080     if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
4081         return 0;
4082
4083     spin_lock(&dev->dev_reservation_lock);
4084     if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4085         ret = target_scsi2_reservation_check(cmd);
4086     else
4087         ret = target_scsi3_pr_reservation_check(cmd);
4088     spin_unlock(&dev->dev_reservation_lock);
4089
4090     return ret;
4091 }