| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Nicholas Bellinger | 12140 | 82.19% | 18 | 18.95% |
| Christoph Hellwig | 1092 | 7.39% | 17 | 17.89% |
| Andy Grover | 859 | 5.82% | 16 | 16.84% |
| Bart Van Assche | 182 | 1.23% | 6 | 6.32% |
| Michael Christie | 105 | 0.71% | 2 | 2.11% |
| David Disseldorp | 84 | 0.57% | 4 | 4.21% |
| Ilias Tsitsimpis | 63 | 0.43% | 1 | 1.05% |
| Hannes Reinecke | 44 | 0.30% | 5 | 5.26% |
| Lee Duncan | 42 | 0.28% | 2 | 2.11% |
| Paolo Bonzini | 26 | 0.18% | 1 | 1.05% |
| Tang Wenji | 20 | 0.14% | 4 | 4.21% |
| Wei Yongjun | 18 | 0.12% | 1 | 1.05% |
| Jörn Engel | 16 | 0.11% | 1 | 1.05% |
| Steven Allen | 14 | 0.09% | 1 | 1.05% |
| Bernhard Kohl | 13 | 0.09% | 1 | 1.05% |
| Al Viro | 11 | 0.07% | 1 | 1.05% |
| Roland Dreier | 8 | 0.05% | 1 | 1.05% |
| Marco Sanvido | 5 | 0.03% | 2 | 2.11% |
| Peter Zijlstra | 5 | 0.03% | 1 | 1.05% |
| Gera Kazakov | 4 | 0.03% | 1 | 1.05% |
| Gustavo A. R. Silva | 4 | 0.03% | 1 | 1.05% |
| Lucas De Marchi | 3 | 0.02% | 1 | 1.05% |
| David S. Miller | 3 | 0.02% | 1 | 1.05% |
| Thomas Gleixner | 2 | 0.01% | 1 | 1.05% |
| Dan Carpenter | 2 | 0.01% | 1 | 1.05% |
| Sagi Grimberg | 2 | 0.01% | 1 | 1.05% |
| Masanari Iida | 2 | 0.01% | 1 | 1.05% |
| Colin Ian King | 1 | 0.01% | 1 | 1.05% |
| Bryant G. Ly | 1 | 0.01% | 1 | 1.05% |
| Total | 14771 | 95 |
// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * Filename: target_core_pr.c * * This file contains SPC-3 compliant persistent reservations and * legacy SPC-2 reservations with compatible reservation handling (CRH=1) * * (c) Copyright 2009-2013 Datera, Inc. * * Nicholas A. Bellinger <nab@kernel.org> * ******************************************************************************/ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/vmalloc.h> #include <linux/file.h> #include <linux/fcntl.h> #include <linux/fs.h> #include <scsi/scsi_proto.h> #include <asm/unaligned.h> #include <target/target_core_base.h> #include <target/target_core_backend.h> #include <target/target_core_fabric.h> #include "target_core_internal.h" #include "target_core_pr.h" #include "target_core_ua.h" /* * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) */ struct pr_transport_id_holder { struct t10_pr_registration *dest_pr_reg; struct se_portal_group *dest_tpg; struct se_node_acl *dest_node_acl; struct se_dev_entry *dest_se_deve; struct list_head dest_list; }; void core_pr_dump_initiator_port( struct t10_pr_registration *pr_reg, char *buf, u32 size) { if (!pr_reg->isid_present_at_reg) { buf[0] = '\0'; return; } snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); } enum register_type { REGISTER, REGISTER_AND_IGNORE_EXISTING_KEY, REGISTER_AND_MOVE, }; enum preempt_type { PREEMPT, PREEMPT_AND_ABORT, }; static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, struct t10_pr_registration *, int, int); static int is_reservation_holder( struct t10_pr_registration *pr_res_holder, struct t10_pr_registration *pr_reg) { int pr_res_type; if (pr_res_holder) { pr_res_type = pr_res_holder->pr_res_type; return pr_res_holder == pr_reg || pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; } return 0; } static sense_reason_t target_scsi2_reservation_check(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; switch (cmd->t_task_cdb[0]) { case INQUIRY: case RELEASE: case RELEASE_10: return 0; default: break; } if (!dev->reservation_holder || !sess) return 0; if (dev->reservation_holder->se_node_acl != sess->se_node_acl) return TCM_RESERVATION_CONFLICT; if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { if (dev->dev_res_bin_isid != sess->sess_bin_isid) return TCM_RESERVATION_CONFLICT; } return 0; } static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, struct se_node_acl *, struct se_session *); static void core_scsi3_put_pr_reg(struct t10_pr_registration *); static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) { struct se_session *se_sess = cmd->se_sess; struct se_device *dev = cmd->se_dev; struct t10_pr_registration *pr_reg; struct t10_reservation *pr_tmpl = &dev->t10_pr; int conflict = 0; pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, se_sess); if (pr_reg) { /* * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE * behavior * * A RESERVE(6) or RESERVE(10) command shall complete with GOOD * status, but no reservation shall be established and the * persistent reservation shall not be changed, if the command * is received from a) and b) below. * * A RELEASE(6) or RELEASE(10) command shall complete with GOOD * status, but the persistent reservation shall not be released, * if the command is received from a) and b) * * a) An I_T nexus that is a persistent reservation holder; or * b) An I_T nexus that is registered if a registrants only or * all registrants type persistent reservation is present. * * In all other cases, a RESERVE(6) command, RESERVE(10) command, * RELEASE(6) command, or RELEASE(10) command shall be processed * as defined in SPC-2. */ if (pr_reg->pr_res_holder) { core_scsi3_put_pr_reg(pr_reg); return 1; } if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { core_scsi3_put_pr_reg(pr_reg); return 1; } core_scsi3_put_pr_reg(pr_reg); conflict = 1; } else { /* * Following spc2r20 5.5.1 Reservations overview: * * If a logical unit has executed a PERSISTENT RESERVE OUT * command with the REGISTER or the REGISTER AND IGNORE * EXISTING KEY service action and is still registered by any * initiator, all RESERVE commands and all RELEASE commands * regardless of initiator shall conflict and shall terminate * with a RESERVATION CONFLICT status. */ spin_lock(&pr_tmpl->registration_lock); conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; spin_unlock(&pr_tmpl->registration_lock); } if (conflict) { pr_err("Received legacy SPC-2 RESERVE/RELEASE" " while active SPC-3 registrations exist," " returning RESERVATION_CONFLICT\n"); return -EBUSY; } return 0; } void target_release_reservation(struct se_device *dev) { dev->reservation_holder = NULL; dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { dev->dev_res_bin_isid = 0; dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; } } sense_reason_t target_scsi2_reservation_release(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; struct se_portal_group *tpg; int rc; if (!sess || !sess->se_tpg) goto out; rc = target_check_scsi2_reservation_conflict(cmd); if (rc == 1) goto out; if (rc < 0) return TCM_RESERVATION_CONFLICT; spin_lock(&dev->dev_reservation_lock); if (!dev->reservation_holder || !sess) goto out_unlock; if (dev->reservation_holder->se_node_acl != sess->se_node_acl) goto out_unlock; if (dev->dev_res_bin_isid != sess->sess_bin_isid) goto out_unlock; target_release_reservation(dev); tpg = sess->se_tpg; pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" " MAPPED LUN: %llu for %s\n", tpg->se_tpg_tfo->fabric_name, cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, sess->se_node_acl->initiatorname); out_unlock: spin_unlock(&dev->dev_reservation_lock); out: target_complete_cmd(cmd, GOOD); return 0; } sense_reason_t target_scsi2_reservation_reserve(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; struct se_portal_group *tpg; sense_reason_t ret = 0; int rc; if ((cmd->t_task_cdb[1] & 0x01) && (cmd->t_task_cdb[1] & 0x02)) { pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); return TCM_UNSUPPORTED_SCSI_OPCODE; } /* * This is currently the case for target_core_mod passthrough struct se_cmd * ops */ if (!sess || !sess->se_tpg) goto out; rc = target_check_scsi2_reservation_conflict(cmd); if (rc == 1) goto out; if (rc < 0) return TCM_RESERVATION_CONFLICT; tpg = sess->se_tpg; spin_lock(&dev->dev_reservation_lock); if (dev->reservation_holder && dev->reservation_holder->se_node_acl != sess->se_node_acl) { pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", tpg->se_tpg_tfo->fabric_name); pr_err("Original reserver LUN: %llu %s\n", cmd->se_lun->unpacked_lun, dev->reservation_holder->se_node_acl->initiatorname); pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" " from %s \n", cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, sess->se_node_acl->initiatorname); ret = TCM_RESERVATION_CONFLICT; goto out_unlock; } dev->reservation_holder = sess; dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; if (sess->sess_bin_isid != 0) { dev->dev_res_bin_isid = sess->sess_bin_isid; dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; } pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" " for %s\n", tpg->se_tpg_tfo->fabric_name, cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, sess->se_node_acl->initiatorname); out_unlock: spin_unlock(&dev->dev_reservation_lock); out: if (!ret) target_complete_cmd(cmd, GOOD); return ret; } /* * Begin SPC-3/SPC-4 Persistent Reservations emulation support * * This function is called by those initiator ports who are *NOT* * the active PR reservation holder when a reservation is present. */ static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, bool isid_mismatch) { unsigned char *cdb = cmd->t_task_cdb; struct se_session *se_sess = cmd->se_sess; struct se_node_acl *nacl = se_sess->se_node_acl; int other_cdb = 0; int registered_nexus = 0, ret = 1; /* Conflict by default */ int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ int we = 0; /* Write Exclusive */ int legacy = 0; /* Act like a legacy device and return * RESERVATION CONFLICT on some CDBs */ if (isid_mismatch) { registered_nexus = 0; } else { struct se_dev_entry *se_deve; rcu_read_lock(); se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); if (se_deve) registered_nexus = test_bit(DEF_PR_REG_ACTIVE, &se_deve->deve_flags); rcu_read_unlock(); } switch (pr_reg_type) { case PR_TYPE_WRITE_EXCLUSIVE: we = 1; case PR_TYPE_EXCLUSIVE_ACCESS: /* * Some commands are only allowed for the persistent reservation * holder. */ break; case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: we = 1; fallthrough; case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: /* * Some commands are only allowed for registered I_T Nexuses. */ reg_only = 1; break; case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: we = 1; fallthrough; case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: /* * Each registered I_T Nexus is a reservation holder. */ all_reg = 1; break; default: return -EINVAL; } /* * Referenced from spc4r17 table 45 for *NON* PR holder access */ switch (cdb[0]) { case SECURITY_PROTOCOL_IN: if (registered_nexus) return 0; ret = (we) ? 0 : 1; break; case MODE_SENSE: case MODE_SENSE_10: case READ_ATTRIBUTE: case READ_BUFFER: case RECEIVE_DIAGNOSTIC: if (legacy) { ret = 1; break; } if (registered_nexus) { ret = 0; break; } ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ break; case PERSISTENT_RESERVE_OUT: /* * This follows PERSISTENT_RESERVE_OUT service actions that * are allowed in the presence of various reservations. * See spc4r17, table 46 */ switch (cdb[1] & 0x1f) { case PRO_CLEAR: case PRO_PREEMPT: case PRO_PREEMPT_AND_ABORT: ret = (registered_nexus) ? 0 : 1; break; case PRO_REGISTER: case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: ret = 0; break; case PRO_REGISTER_AND_MOVE: case PRO_RESERVE: ret = 1; break; case PRO_RELEASE: ret = (registered_nexus) ? 0 : 1; break; default: pr_err("Unknown PERSISTENT_RESERVE_OUT service" " action: 0x%02x\n", cdb[1] & 0x1f); return -EINVAL; } break; case RELEASE: case RELEASE_10: /* Handled by CRH=1 in target_scsi2_reservation_release() */ ret = 0; break; case RESERVE: case RESERVE_10: /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ ret = 0; break; case TEST_UNIT_READY: ret = (legacy) ? 1 : 0; /* Conflict for legacy */ break; case MAINTENANCE_IN: switch (cdb[1] & 0x1f) { case MI_MANAGEMENT_PROTOCOL_IN: if (registered_nexus) { ret = 0; break; } ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ break; case MI_REPORT_SUPPORTED_OPERATION_CODES: case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: if (legacy) { ret = 1; break; } if (registered_nexus) { ret = 0; break; } ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ break; case MI_REPORT_ALIASES: case MI_REPORT_IDENTIFYING_INFORMATION: case MI_REPORT_PRIORITY: case MI_REPORT_TARGET_PGS: case MI_REPORT_TIMESTAMP: ret = 0; /* Allowed */ break; default: pr_err("Unknown MI Service Action: 0x%02x\n", (cdb[1] & 0x1f)); return -EINVAL; } break; case ACCESS_CONTROL_IN: case ACCESS_CONTROL_OUT: case INQUIRY: case LOG_SENSE: case SERVICE_ACTION_IN_12: case REPORT_LUNS: case REQUEST_SENSE: case PERSISTENT_RESERVE_IN: ret = 0; /*/ Allowed CDBs */ break; default: other_cdb = 1; break; } /* * Case where the CDB is explicitly allowed in the above switch * statement. */ if (!ret && !other_cdb) { pr_debug("Allowing explicit CDB: 0x%02x for %s" " reservation holder\n", cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); return ret; } /* * Check if write exclusive initiator ports *NOT* holding the * WRITE_EXCLUSIVE_* reservation. */ if (we && !registered_nexus) { if (cmd->data_direction == DMA_TO_DEVICE) { /* * Conflict for write exclusive */ pr_debug("%s Conflict for unregistered nexus" " %s CDB: 0x%02x to %s reservation\n", transport_dump_cmd_direction(cmd), se_sess->se_node_acl->initiatorname, cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); return 1; } else { /* * Allow non WRITE CDBs for all Write Exclusive * PR TYPEs to pass for registered and * non-registered_nexuxes NOT holding the reservation. * * We only make noise for the unregisterd nexuses, * as we expect registered non-reservation holding * nexuses to issue CDBs. */ if (!registered_nexus) { pr_debug("Allowing implicit CDB: 0x%02x" " for %s reservation on unregistered" " nexus\n", cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); } return 0; } } else if ((reg_only) || (all_reg)) { if (registered_nexus) { /* * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, * allow commands from registered nexuses. */ pr_debug("Allowing implicit CDB: 0x%02x for %s" " reservation\n", cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); return 0; } } else if (we && registered_nexus) { /* * Reads are allowed for Write Exclusive locks * from all registrants. */ if (cmd->data_direction == DMA_FROM_DEVICE) { pr_debug("Allowing READ CDB: 0x%02x for %s" " reservation\n", cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); return 0; } } pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" " for %s reservation\n", transport_dump_cmd_direction(cmd), (registered_nexus) ? "" : "un", se_sess->se_node_acl->initiatorname, cdb[0], core_scsi3_pr_dump_type(pr_reg_type)); return 1; /* Conflict by default */ } static sense_reason_t target_scsi3_pr_reservation_check(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; u32 pr_reg_type; bool isid_mismatch = false; if (!dev->dev_pr_res_holder) return 0; pr_reg_type = dev->dev_pr_res_holder->pr_res_type; cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) goto check_nonholder; if (dev->dev_pr_res_holder->isid_present_at_reg) { if (dev->dev_pr_res_holder->pr_reg_bin_isid != sess->sess_bin_isid) { isid_mismatch = true; goto check_nonholder; } } return 0; check_nonholder: if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) return TCM_RESERVATION_CONFLICT; return 0; } static u32 core_scsi3_pr_generation(struct se_device *dev) { u32 prg; /* * PRGeneration field shall contain the value of a 32-bit wrapping * counter mainted by the device server. * * Note that this is done regardless of Active Persist across * Target PowerLoss (APTPL) * * See spc4r17 section 6.3.12 READ_KEYS service action */ spin_lock(&dev->dev_reservation_lock); prg = dev->t10_pr.pr_generation++; spin_unlock(&dev->dev_reservation_lock); return prg; } static struct t10_pr_registration *__core_scsi3_do_alloc_registration( struct se_device *dev, struct se_node_acl *nacl, struct se_lun *lun, struct se_dev_entry *dest_deve, u64 mapped_lun, unsigned char *isid, u64 sa_res_key, int all_tg_pt, int aptpl) { struct t10_pr_registration *pr_reg; pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); if (!pr_reg) { pr_err("Unable to allocate struct t10_pr_registration\n"); return NULL; } INIT_LIST_HEAD(&pr_reg->pr_reg_list); INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); atomic_set(&pr_reg->pr_res_holders, 0); pr_reg->pr_reg_nacl = nacl; /* * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, * the se_dev_entry->pr_ref will have been already obtained by * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). * * Otherwise, locate se_dev_entry now and obtain a reference until * registration completes in __core_scsi3_add_registration(). */ if (dest_deve) { pr_reg->pr_reg_deve = dest_deve; } else { rcu_read_lock(); pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); if (!pr_reg->pr_reg_deve) { rcu_read_unlock(); pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", nacl->initiatorname, mapped_lun); kmem_cache_free(t10_pr_reg_cache, pr_reg); return NULL; } kref_get(&pr_reg->pr_reg_deve->pr_kref); rcu_read_unlock(); } pr_reg->pr_res_mapped_lun = mapped_lun; pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; pr_reg->pr_res_key = sa_res_key; pr_reg->pr_reg_all_tg_pt = all_tg_pt; pr_reg->pr_reg_aptpl = aptpl; /* * If an ISID value for this SCSI Initiator Port exists, * save it to the registration now. */ if (isid != NULL) { pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); pr_reg->isid_present_at_reg = 1; } return pr_reg; } static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); /* * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 * modes. */ static struct t10_pr_registration *__core_scsi3_alloc_registration( struct se_device *dev, struct se_node_acl *nacl, struct se_lun *lun, struct se_dev_entry *deve, u64 mapped_lun, unsigned char *isid, u64 sa_res_key, int all_tg_pt, int aptpl) { struct se_dev_entry *deve_tmp; struct se_node_acl *nacl_tmp; struct se_lun_acl *lacl_tmp; struct se_lun *lun_tmp, *next, *dest_lun; const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; int ret; /* * Create a registration for the I_T Nexus upon which the * PROUT REGISTER was received. */ pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, isid, sa_res_key, all_tg_pt, aptpl); if (!pr_reg) return NULL; /* * Return pointer to pr_reg for ALL_TG_PT=0 */ if (!all_tg_pt) return pr_reg; /* * Create list of matching SCSI Initiator Port registrations * for ALL_TG_PT=1 */ spin_lock(&dev->se_port_lock); list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) continue; spin_unlock(&dev->se_port_lock); spin_lock(&lun_tmp->lun_deve_lock); list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { /* * This pointer will be NULL for demo mode MappedLUNs * that have not been make explicit via a ConfigFS * MappedLUN group for the SCSI Initiator Node ACL. */ if (!deve_tmp->se_lun_acl) continue; lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, lockdep_is_held(&lun_tmp->lun_deve_lock)); nacl_tmp = lacl_tmp->se_lun_nacl; /* * Skip the matching struct se_node_acl that is allocated * above.. */ if (nacl == nacl_tmp) continue; /* * Only perform PR registrations for target ports on * the same fabric module as the REGISTER w/ ALL_TG_PT=1 * arrived. */ if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) continue; /* * Look for a matching Initiator Node ACL in ASCII format */ if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) continue; kref_get(&deve_tmp->pr_kref); spin_unlock(&lun_tmp->lun_deve_lock); /* * Grab a configfs group dependency that is released * for the exception path at label out: below, or upon * completion of adding ALL_TG_PT=1 registrations in * __core_scsi3_add_registration() */ ret = core_scsi3_lunacl_depend_item(deve_tmp); if (ret < 0) { pr_err("core_scsi3_lunacl_depend" "_item() failed\n"); percpu_ref_put(&lun_tmp->lun_ref); kref_put(&deve_tmp->pr_kref, target_pr_kref_release); goto out; } /* * Located a matching SCSI Initiator Port on a different * port, allocate the pr_reg_atp and attach it to the * pr_reg->pr_reg_atp_list that will be processed once * the original *pr_reg is processed in * __core_scsi3_add_registration() */ dest_lun = rcu_dereference_check(deve_tmp->se_lun, kref_read(&deve_tmp->pr_kref) != 0); pr_reg_atp = __core_scsi3_do_alloc_registration(dev, nacl_tmp, dest_lun, deve_tmp, deve_tmp->mapped_lun, NULL, sa_res_key, all_tg_pt, aptpl); if (!pr_reg_atp) { percpu_ref_put(&lun_tmp->lun_ref); core_scsi3_lunacl_undepend_item(deve_tmp); goto out; } list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, &pr_reg->pr_reg_atp_list); spin_lock(&lun_tmp->lun_deve_lock); } spin_unlock(&lun_tmp->lun_deve_lock); spin_lock(&dev->se_port_lock); percpu_ref_put(&lun_tmp->lun_ref); } spin_unlock(&dev->se_port_lock); return pr_reg; out: list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { list_del(&pr_reg_tmp->pr_reg_atp_mem_list); core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); } kmem_cache_free(t10_pr_reg_cache, pr_reg); return NULL; } int core_scsi3_alloc_aptpl_registration( struct t10_reservation *pr_tmpl, u64 sa_res_key, unsigned char *i_port, unsigned char *isid, u64 mapped_lun, unsigned char *t_port, u16 tpgt, u64 target_lun, int res_holder, int all_tg_pt, u8 type) { struct t10_pr_registration *pr_reg; if (!i_port || !t_port || !sa_res_key) { pr_err("Illegal parameters for APTPL registration\n"); return -EINVAL; } pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); if (!pr_reg) { pr_err("Unable to allocate struct t10_pr_registration\n"); return -ENOMEM; } INIT_LIST_HEAD(&pr_reg->pr_reg_list); INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); atomic_set(&pr_reg->pr_res_holders, 0); pr_reg->pr_reg_nacl = NULL; pr_reg->pr_reg_deve = NULL; pr_reg->pr_res_mapped_lun = mapped_lun; pr_reg->pr_aptpl_target_lun = target_lun; pr_reg->pr_res_key = sa_res_key; pr_reg->pr_reg_all_tg_pt = all_tg_pt; pr_reg->pr_reg_aptpl = 1; pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ pr_reg->pr_res_type = type; /* * If an ISID value had been saved in APTPL metadata for this * SCSI Initiator Port, restore it now. */ if (isid != NULL) { pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); pr_reg->isid_present_at_reg = 1; } /* * Copy the i_port and t_port information from caller. */ snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); pr_reg->pr_reg_tpgt = tpgt; /* * Set pr_res_holder from caller, the pr_reg who is the reservation * holder will get it's pointer set in core_scsi3_aptpl_reserve() once * the Initiator Node LUN ACL from the fabric module is created for * this registration. */ pr_reg->pr_res_holder = res_holder; list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); pr_debug("SPC-3 PR APTPL Successfully added registration%s from" " metadata\n", (res_holder) ? "+reservation" : ""); return 0; } static void core_scsi3_aptpl_reserve( struct se_device *dev, struct se_portal_group *tpg, struct se_node_acl *node_acl, struct t10_pr_registration *pr_reg) { char i_buf[PR_REG_ISID_ID_LEN]; memset(i_buf, 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); spin_lock(&dev->dev_reservation_lock); dev->dev_pr_res_holder = pr_reg; spin_unlock(&dev->dev_reservation_lock); pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" " new reservation holder TYPE: %s ALL_TG_PT: %d\n", tpg->se_tpg_tfo->fabric_name, core_scsi3_pr_dump_type(pr_reg->pr_res_type), (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname, i_buf); } static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, struct t10_pr_registration *, enum register_type, int); static int __core_scsi3_check_aptpl_registration( struct se_device *dev, struct se_portal_group *tpg, struct se_lun *lun, u64 target_lun, struct se_node_acl *nacl, u64 mapped_lun) { struct t10_pr_registration *pr_reg, *pr_reg_tmp; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; u16 tpgt; memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); /* * Copy Initiator Port information from struct se_node_acl */ snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", tpg->se_tpg_tfo->tpg_get_wwn(tpg)); tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); /* * Look for the matching registrations+reservation from those * created from APTPL metadata. Note that multiple registrations * may exist for fabrics that use ISIDs in their SCSI Initiator Port * TransportIDs. */ spin_lock(&pr_tmpl->aptpl_reg_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, pr_reg_aptpl_list) { if (!strcmp(pr_reg->pr_iport, i_port) && (pr_reg->pr_res_mapped_lun == mapped_lun) && !(strcmp(pr_reg->pr_tport, t_port)) && (pr_reg->pr_reg_tpgt == tpgt) && (pr_reg->pr_aptpl_target_lun == target_lun)) { /* * Obtain the ->pr_reg_deve pointer + reference, that * is released by __core_scsi3_add_registration() below. */ rcu_read_lock(); pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); if (!pr_reg->pr_reg_deve) { pr_err("Unable to locate PR APTPL %s mapped_lun:" " %llu\n", nacl->initiatorname, mapped_lun); rcu_read_unlock(); continue; } kref_get(&pr_reg->pr_reg_deve->pr_kref); rcu_read_unlock(); pr_reg->pr_reg_nacl = nacl; pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; list_del(&pr_reg->pr_reg_aptpl_list); spin_unlock(&pr_tmpl->aptpl_reg_lock); /* * At this point all of the pointers in *pr_reg will * be setup, so go ahead and add the registration. */ __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); /* * If this registration is the reservation holder, * make that happen now.. */ if (pr_reg->pr_res_holder) core_scsi3_aptpl_reserve(dev, tpg, nacl, pr_reg); /* * Reenable pr_aptpl_active to accept new metadata * updates once the SCSI device is active again.. */ spin_lock(&pr_tmpl->aptpl_reg_lock); pr_tmpl->pr_aptpl_active = 1; } } spin_unlock(&pr_tmpl->aptpl_reg_lock); return 0; } int core_scsi3_check_aptpl_registration( struct se_device *dev, struct se_portal_group *tpg, struct se_lun *lun, struct se_node_acl *nacl, u64 mapped_lun) { if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) return 0; return __core_scsi3_check_aptpl_registration(dev, tpg, lun, lun->unpacked_lun, nacl, mapped_lun); } static void __core_scsi3_dump_registration( const struct target_core_fabric_ops *tfo, struct se_device *dev, struct se_node_acl *nacl, struct t10_pr_registration *pr_reg, enum register_type register_type) { struct se_portal_group *se_tpg = nacl->se_tpg; char i_buf[PR_REG_ISID_ID_LEN]; memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ? "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, i_buf); pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", tfo->fabric_name, tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg)); pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" " Port(s)\n", tfo->fabric_name, (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", dev->transport->name); pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" " 0x%08x APTPL: %d\n", tfo->fabric_name, pr_reg->pr_res_key, pr_reg->pr_res_generation, pr_reg->pr_reg_aptpl); } static void __core_scsi3_add_registration( struct se_device *dev, struct se_node_acl *nacl, struct t10_pr_registration *pr_reg, enum register_type register_type, int register_move) { const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; struct t10_reservation *pr_tmpl = &dev->t10_pr; struct se_dev_entry *deve; /* * Increment PRgeneration counter for struct se_device upon a successful * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action * * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service * action, the struct se_device->dev_reservation_lock will already be held, * so we do not call core_scsi3_pr_generation() which grabs the lock * for the REGISTER. */ pr_reg->pr_res_generation = (register_move) ? dev->t10_pr.pr_generation++ : core_scsi3_pr_generation(dev); spin_lock(&pr_tmpl->registration_lock); list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); spin_unlock(&pr_tmpl->registration_lock); /* * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. */ if (!pr_reg->pr_reg_all_tg_pt || register_move) goto out; /* * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 * allocated in __core_scsi3_alloc_registration() */ list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; list_del(&pr_reg_tmp->pr_reg_atp_mem_list); pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); spin_lock(&pr_tmpl->registration_lock); list_add_tail(&pr_reg_tmp->pr_reg_list, &pr_tmpl->registration_list); __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, register_type); spin_unlock(&pr_tmpl->registration_lock); /* * Drop configfs group dependency reference and deve->pr_kref * obtained from __core_scsi3_alloc_registration() code. */ rcu_read_lock(); deve = pr_reg_tmp->pr_reg_deve; if (deve) { set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); core_scsi3_lunacl_undepend_item(deve); pr_reg_tmp->pr_reg_deve = NULL; } rcu_read_unlock(); } out: /* * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() */ rcu_read_lock(); deve = pr_reg->pr_reg_deve; if (deve) { set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); kref_put(&deve->pr_kref, target_pr_kref_release); pr_reg->pr_reg_deve = NULL; } rcu_read_unlock(); } static int core_scsi3_alloc_registration( struct se_device *dev, struct se_node_acl *nacl, struct se_lun *lun, struct se_dev_entry *deve, u64 mapped_lun, unsigned char *isid, u64 sa_res_key, int all_tg_pt, int aptpl, enum register_type register_type, int register_move) { struct t10_pr_registration *pr_reg; pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, isid, sa_res_key, all_tg_pt, aptpl); if (!pr_reg) return -EPERM; __core_scsi3_add_registration(dev, nacl, pr_reg, register_type, register_move); return 0; } static struct t10_pr_registration *__core_scsi3_locate_pr_reg( struct se_device *dev, struct se_node_acl *nacl, unsigned char *isid) { struct t10_reservation *pr_tmpl = &dev->t10_pr; struct t10_pr_registration *pr_reg, *pr_reg_tmp; spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { /* * First look for a matching struct se_node_acl */ if (pr_reg->pr_reg_nacl != nacl) continue; /* * If this registration does NOT contain a fabric provided * ISID, then we have found a match. */ if (!pr_reg->isid_present_at_reg) { atomic_inc_mb(&pr_reg->pr_res_holders); spin_unlock(&pr_tmpl->registration_lock); return pr_reg; } /* * If the *pr_reg contains a fabric defined ISID for multi-value * SCSI Initiator Port TransportIDs, then we expect a valid * matching ISID to be provided by the local SCSI Initiator Port. */ if (!isid) continue; if (strcmp(isid, pr_reg->pr_reg_isid)) continue; atomic_inc_mb(&pr_reg->pr_res_holders); spin_unlock(&pr_tmpl->registration_lock); return pr_reg; } spin_unlock(&pr_tmpl->registration_lock); return NULL; } static struct t10_pr_registration *core_scsi3_locate_pr_reg( struct se_device *dev, struct se_node_acl *nacl, struct se_session *sess) { struct se_portal_group *tpg = nacl->se_tpg; unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { memset(&buf[0], 0, PR_REG_ISID_LEN); tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], PR_REG_ISID_LEN); isid_ptr = &buf[0]; } return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); } static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) { atomic_dec_mb(&pr_reg->pr_res_holders); } static int core_scsi3_check_implicit_release( struct se_device *dev, struct t10_pr_registration *pr_reg) { struct se_node_acl *nacl = pr_reg->pr_reg_nacl; struct t10_pr_registration *pr_res_holder; int ret = 0; spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (!pr_res_holder) { spin_unlock(&dev->dev_reservation_lock); return ret; } if (pr_res_holder == pr_reg) { /* * Perform an implicit RELEASE if the registration that * is being released is holding the reservation. * * From spc4r17, section 5.7.11.1: * * e) If the I_T nexus is the persistent reservation holder * and the persistent reservation is not an all registrants * type, then a PERSISTENT RESERVE OUT command with REGISTER * service action or REGISTER AND IGNORE EXISTING KEY * service action with the SERVICE ACTION RESERVATION KEY * field set to zero (see 5.7.11.3). */ __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); ret = 1; /* * For 'All Registrants' reservation types, all existing * registrations are still processed as reservation holders * in core_scsi3_pr_seq_non_holder() after the initial * reservation holder is implicitly released here. */ } else if (pr_reg->pr_reg_all_tg_pt && (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, pr_reg->pr_reg_nacl->initiatorname)) && (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" " UNREGISTER while existing reservation with matching" " key 0x%016Lx is present from another SCSI Initiator" " Port\n", pr_reg->pr_res_key); ret = -EPERM; } spin_unlock(&dev->dev_reservation_lock); return ret; } static void __core_scsi3_free_registration( struct se_device *dev, struct t10_pr_registration *pr_reg, struct list_head *preempt_and_abort_list, int dec_holders) __releases(&pr_tmpl->registration_lock) __acquires(&pr_tmpl->registration_lock) { const struct target_core_fabric_ops *tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; struct t10_reservation *pr_tmpl = &dev->t10_pr; struct se_node_acl *nacl = pr_reg->pr_reg_nacl; struct se_dev_entry *deve; char i_buf[PR_REG_ISID_ID_LEN]; lockdep_assert_held(&pr_tmpl->registration_lock); memset(i_buf, 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); if (!list_empty(&pr_reg->pr_reg_list)) list_del(&pr_reg->pr_reg_list); /* * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), * so call core_scsi3_put_pr_reg() to decrement our reference. */ if (dec_holders) core_scsi3_put_pr_reg(pr_reg); spin_unlock(&pr_tmpl->registration_lock); /* * Wait until all reference from any other I_T nexuses for this * *pr_reg have been released. Because list_del() is called above, * the last core_scsi3_put_pr_reg(pr_reg) will release this reference * count back to zero, and we release *pr_reg. */ while (atomic_read(&pr_reg->pr_res_holders) != 0) { pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", tfo->fabric_name); cpu_relax(); } rcu_read_lock(); deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); if (deve) clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); rcu_read_unlock(); spin_lock(&pr_tmpl->registration_lock); pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" " Node: %s%s\n", tfo->fabric_name, pr_reg->pr_reg_nacl->initiatorname, i_buf); pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" " Port(s)\n", tfo->fabric_name, (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", dev->transport->name); pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, pr_reg->pr_res_generation); if (!preempt_and_abort_list) { pr_reg->pr_reg_deve = NULL; pr_reg->pr_reg_nacl = NULL; kmem_cache_free(t10_pr_reg_cache, pr_reg); return; } /* * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list * are released once the ABORT_TASK_SET has completed.. */ list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); } void core_scsi3_free_pr_reg_from_nacl( struct se_device *dev, struct se_node_acl *nacl) { struct t10_reservation *pr_tmpl = &dev->t10_pr; struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; bool free_reg = false; /* * If the passed se_node_acl matches the reservation holder, * release the reservation. */ spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if ((pr_res_holder != NULL) && (pr_res_holder->pr_reg_nacl == nacl)) { __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); free_reg = true; } spin_unlock(&dev->dev_reservation_lock); /* * Release any registration associated with the struct se_node_acl. */ spin_lock(&pr_tmpl->registration_lock); if (pr_res_holder && free_reg) __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { if (pr_reg->pr_reg_nacl != nacl) continue; __core_scsi3_free_registration(dev, pr_reg, NULL, 0); } spin_unlock(&pr_tmpl->registration_lock); } void core_scsi3_free_all_registrations( struct se_device *dev) { struct t10_reservation *pr_tmpl = &dev->t10_pr; struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (pr_res_holder != NULL) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; __core_scsi3_complete_pro_release(dev, pr_res_nacl, pr_res_holder, 0, 0); } spin_unlock(&dev->dev_reservation_lock); spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { __core_scsi3_free_registration(dev, pr_reg, NULL, 0); } spin_unlock(&pr_tmpl->registration_lock); spin_lock(&pr_tmpl->aptpl_reg_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, pr_reg_aptpl_list) { list_del(&pr_reg->pr_reg_aptpl_list); kmem_cache_free(t10_pr_reg_cache, pr_reg); } spin_unlock(&pr_tmpl->aptpl_reg_lock); } static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) { return target_depend_item(&tpg->tpg_group.cg_item); } static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) { target_undepend_item(&tpg->tpg_group.cg_item); atomic_dec_mb(&tpg->tpg_pr_ref_count); } static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) { if (nacl->dynamic_node_acl) return 0; return target_depend_item(&nacl->acl_group.cg_item); } static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) { if (!nacl->dynamic_node_acl) target_undepend_item(&nacl->acl_group.cg_item); atomic_dec_mb(&nacl->acl_pr_ref_count); } static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) { struct se_lun_acl *lun_acl; /* * For nacl->dynamic_node_acl=1 */ lun_acl = rcu_dereference_check(se_deve->se_lun_acl, kref_read(&se_deve->pr_kref) != 0); if (!lun_acl) return 0; return target_depend_item(&lun_acl->se_lun_group.cg_item); } static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) { struct se_lun_acl *lun_acl; /* * For nacl->dynamic_node_acl=1 */ lun_acl = rcu_dereference_check(se_deve->se_lun_acl, kref_read(&se_deve->pr_kref) != 0); if (!lun_acl) { kref_put(&se_deve->pr_kref, target_pr_kref_release); return; } target_undepend_item(&lun_acl->se_lun_group.cg_item); kref_put(&se_deve->pr_kref, target_pr_kref_release); } static sense_reason_t core_scsi3_decode_spec_i_port( struct se_cmd *cmd, struct se_portal_group *tpg, unsigned char *l_isid, u64 sa_res_key, int all_tg_pt, int aptpl) { struct se_device *dev = cmd->se_dev; struct se_portal_group *dest_tpg = NULL, *tmp_tpg; struct se_session *se_sess = cmd->se_sess; struct se_node_acl *dest_node_acl = NULL; struct se_dev_entry *dest_se_deve = NULL; struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; LIST_HEAD(tid_dest_list); struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; unsigned char *buf, *ptr, proto_ident; const unsigned char *i_str = NULL; char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; sense_reason_t ret; u32 tpdl, tid_len = 0; u32 dest_rtpi = 0; /* * Allocate a struct pr_transport_id_holder and setup the * local_node_acl pointer and add to struct list_head tid_dest_list * for add registration processing in the loop of tid_dest_list below. */ tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); if (!tidh_new) { pr_err("Unable to allocate tidh_new\n"); return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; } INIT_LIST_HEAD(&tidh_new->dest_list); tidh_new->dest_tpg = tpg; tidh_new->dest_node_acl = se_sess->se_node_acl; local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, se_sess->se_node_acl, cmd->se_lun, NULL, cmd->orig_fe_lun, l_isid, sa_res_key, all_tg_pt, aptpl); if (!local_pr_reg) { kfree(tidh_new); return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; } if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) { kfree(tidh_new); kref_put(&local_pr_reg->pr_reg_deve->pr_kref, target_pr_kref_release); kmem_cache_free(t10_pr_reg_cache, local_pr_reg); return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; } tidh_new->dest_pr_reg = local_pr_reg; list_add_tail(&tidh_new->dest_list, &tid_dest_list); if (cmd->data_length < 28) { pr_warn("SPC-PR: Received PR OUT parameter list" " length too small: %u\n", cmd->data_length); ret = TCM_INVALID_PARAMETER_LIST; goto out; } buf = transport_kmap_data_sg(cmd); if (!buf) { ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; goto out; } /* * For a PERSISTENT RESERVE OUT specify initiator ports payload, * first extract TransportID Parameter Data Length, and make sure * the value matches up to the SCSI expected data transfer length. */ tpdl = get_unaligned_be32(&buf[24]); if ((tpdl + 28) != cmd->data_length) { pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" " does not equal CDB data_length: %u\n", tpdl, cmd->data_length); ret = TCM_INVALID_PARAMETER_LIST; goto out_unmap; } /* * Start processing the received transport IDs using the * receiving I_T Nexus portal's fabric dependent methods to * obtain the SCSI Initiator Port/Device Identifiers. */ ptr = &buf[28]; while (tpdl > 0) { struct se_lun *dest_lun, *tmp_lun; proto_ident = (ptr[0] & 0x0f); dest_tpg = NULL; spin_lock(&dev->se_port_lock); list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { tmp_tpg = tmp_lun->lun_tpg; /* * Look for the matching proto_ident provided by * the received TransportID */ if (tmp_tpg->proto_id != proto_ident) continue; dest_rtpi = tmp_lun->lun_rtpi; iport_ptr = NULL; i_str = target_parse_pr_out_transport_id(tmp_tpg, ptr, &tid_len, &iport_ptr); if (!i_str) continue; /* * Determine if this SCSI device server requires that * SCSI Intiatior TransportID w/ ISIDs is enforced * for fabric modules (iSCSI) requiring them. */ if (tpg->se_tpg_tfo->sess_get_initiator_sid && dev->dev_attrib.enforce_pr_isids && !iport_ptr) { pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.", i_str); ret = TCM_INVALID_PARAMETER_LIST; spin_unlock(&dev->se_port_lock); goto out_unmap; } atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); spin_unlock(&dev->se_port_lock); if (core_scsi3_tpg_depend_item(tmp_tpg)) { pr_err(" core_scsi3_tpg_depend_item()" " for tmp_tpg\n"); atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out_unmap; } /* * Locate the destination initiator ACL to be registered * from the decoded fabric module specific TransportID * at *i_str. */ mutex_lock(&tmp_tpg->acl_node_mutex); dest_node_acl = __core_tpg_get_initiator_node_acl( tmp_tpg, i_str); if (dest_node_acl) atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); mutex_unlock(&tmp_tpg->acl_node_mutex); if (!dest_node_acl) { core_scsi3_tpg_undepend_item(tmp_tpg); spin_lock(&dev->se_port_lock); continue; } if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { pr_err("configfs_depend_item() failed" " for dest_node_acl->acl_group\n"); atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); core_scsi3_tpg_undepend_item(tmp_tpg); ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out_unmap; } dest_tpg = tmp_tpg; pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" " %s Port RTPI: %hu\n", dest_tpg->se_tpg_tfo->fabric_name, dest_node_acl->initiatorname, dest_rtpi); spin_lock(&dev->se_port_lock); break; } spin_unlock(&dev->se_port_lock); if (!dest_tpg) { pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" " dest_tpg\n"); ret = TCM_INVALID_PARAMETER_LIST; goto out_unmap; } pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" " tid_len: %d for %s + %s\n", dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, tpdl, tid_len, i_str, iport_ptr); if (tid_len > tpdl) { pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" " %u for Transport ID: %s\n", tid_len, ptr); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); ret = TCM_INVALID_PARAMETER_LIST; goto out_unmap; } /* * Locate the desintation struct se_dev_entry pointer for matching * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus * Target Port. */ dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, dest_rtpi); if (!dest_se_deve) { pr_err("Unable to locate %s dest_se_deve" " from destination RTPI: %hu\n", dest_tpg->se_tpg_tfo->fabric_name, dest_rtpi); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); ret = TCM_INVALID_PARAMETER_LIST; goto out_unmap; } if (core_scsi3_lunacl_depend_item(dest_se_deve)) { pr_err("core_scsi3_lunacl_depend_item()" " failed\n"); kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out_unmap; } pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" " dest_se_deve mapped_lun: %llu\n", dest_tpg->se_tpg_tfo->fabric_name, dest_node_acl->initiatorname, dest_se_deve->mapped_lun); /* * Skip any TransportIDs that already have a registration for * this target port. */ pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, iport_ptr); if (pr_reg_e) { core_scsi3_put_pr_reg(pr_reg_e); core_scsi3_lunacl_undepend_item(dest_se_deve); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); ptr += tid_len; tpdl -= tid_len; tid_len = 0; continue; } /* * Allocate a struct pr_transport_id_holder and setup * the dest_node_acl and dest_se_deve pointers for the * loop below. */ tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); if (!tidh_new) { pr_err("Unable to allocate tidh_new\n"); core_scsi3_lunacl_undepend_item(dest_se_deve); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out_unmap; } INIT_LIST_HEAD(&tidh_new->dest_list); tidh_new->dest_tpg = dest_tpg; tidh_new->dest_node_acl = dest_node_acl; tidh_new->dest_se_deve = dest_se_deve; /* * Allocate, but do NOT add the registration for the * TransportID referenced SCSI Initiator port. This * done because of the following from spc4r17 in section * 6.14.3 wrt SPEC_I_PT: * * "If a registration fails for any initiator port (e.g., if th * logical unit does not have enough resources available to * hold the registration information), no registrations shall be * made, and the command shall be terminated with * CHECK CONDITION status." * * That means we call __core_scsi3_alloc_registration() here, * and then call __core_scsi3_add_registration() in the * 2nd loop which will never fail. */ dest_lun = rcu_dereference_check(dest_se_deve->se_lun, kref_read(&dest_se_deve->pr_kref) != 0); dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, dest_lun, dest_se_deve, dest_se_deve->mapped_lun, iport_ptr, sa_res_key, all_tg_pt, aptpl); if (!dest_pr_reg) { core_scsi3_lunacl_undepend_item(dest_se_deve); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); kfree(tidh_new); ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; goto out_unmap; } tidh_new->dest_pr_reg = dest_pr_reg; list_add_tail(&tidh_new->dest_list, &tid_dest_list); ptr += tid_len; tpdl -= tid_len; tid_len = 0; } transport_kunmap_data_sg(cmd); /* * Go ahead and create a registrations from tid_dest_list for the * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl * and dest_se_deve. * * The SA Reservation Key from the PROUT is set for the * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 * means that the TransportID Initiator port will be * registered on all of the target ports in the SCSI target device * ALL_TG_PT=0 means the registration will only be for the * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 * was received. */ list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { dest_tpg = tidh->dest_tpg; dest_node_acl = tidh->dest_node_acl; dest_se_deve = tidh->dest_se_deve; dest_pr_reg = tidh->dest_pr_reg; list_del(&tidh->dest_list); kfree(tidh); memset(i_buf, 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, dest_pr_reg, 0, 0); pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" " registered Transport ID for Node: %s%s Mapped LUN:" " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? dest_se_deve->mapped_lun : 0); if (dest_pr_reg == local_pr_reg) continue; core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); } return 0; out_unmap: transport_kunmap_data_sg(cmd); out: /* * For the failure case, release everything from tid_dest_list * including *dest_pr_reg and the configfs dependances.. */ list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { bool is_local = false; dest_tpg = tidh->dest_tpg; dest_node_acl = tidh->dest_node_acl; dest_se_deve = tidh->dest_se_deve; dest_pr_reg = tidh->dest_pr_reg; if (dest_pr_reg == local_pr_reg) is_local = true; list_del(&tidh->dest_list); kfree(tidh); /* * Release any extra ALL_TG_PT=1 registrations for * the SPEC_I_PT=1 case. */ list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, &dest_pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { list_del(&pr_reg_tmp->pr_reg_atp_mem_list); core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); } kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); core_scsi3_lunacl_undepend_item(dest_se_deve); if (is_local) continue; core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_tpg); } return ret; } static int core_scsi3_update_aptpl_buf( struct se_device *dev, unsigned char *buf, u32 pr_aptpl_buf_len) { struct se_portal_group *tpg; struct t10_pr_registration *pr_reg; unsigned char tmp[512], isid_buf[32]; ssize_t len = 0; int reg_count = 0; int ret = 0; spin_lock(&dev->dev_reservation_lock); spin_lock(&dev->t10_pr.registration_lock); /* * Walk the registration list.. */ list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, pr_reg_list) { tmp[0] = '\0'; isid_buf[0] = '\0'; tpg = pr_reg->pr_reg_nacl->se_tpg; /* * Write out any ISID value to APTPL metadata that was included * in the original registration. */ if (pr_reg->isid_present_at_reg) snprintf(isid_buf, 32, "initiator_sid=%s\n", pr_reg->pr_reg_isid); /* * Include special metadata if the pr_reg matches the * reservation holder. */ if (dev->dev_pr_res_holder == pr_reg) { snprintf(tmp, 512, "PR_REG_START: %d" "\ninitiator_fabric=%s\n" "initiator_node=%s\n%s" "sa_res_key=%llu\n" "res_holder=1\nres_type=%02x\n" "res_scope=%02x\nres_all_tg_pt=%d\n" "mapped_lun=%llu\n", reg_count, tpg->se_tpg_tfo->fabric_name, pr_reg->pr_reg_nacl->initiatorname, isid_buf, pr_reg->pr_res_key, pr_reg->pr_res_type, pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, pr_reg->pr_res_mapped_lun); } else { snprintf(tmp, 512, "PR_REG_START: %d\n" "initiator_fabric=%s\ninitiator_node=%s\n%s" "sa_res_key=%llu\nres_holder=0\n" "res_all_tg_pt=%d\nmapped_lun=%llu\n", reg_count, tpg->se_tpg_tfo->fabric_name, pr_reg->pr_reg_nacl->initiatorname, isid_buf, pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, pr_reg->pr_res_mapped_lun); } if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { pr_err("Unable to update renaming APTPL metadata," " reallocating larger buffer\n"); ret = -EMSGSIZE; goto out; } len += sprintf(buf+len, "%s", tmp); /* * Include information about the associated SCSI target port. */ snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" " %d\n", tpg->se_tpg_tfo->fabric_name, tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpg->se_tpg_tfo->tpg_get_tag(tpg), pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, reg_count); if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { pr_err("Unable to update renaming APTPL metadata," " reallocating larger buffer\n"); ret = -EMSGSIZE; goto out; } len += sprintf(buf+len, "%s", tmp); reg_count++; } if (!reg_count) len += sprintf(buf+len, "No Registrations or Reservations"); out: spin_unlock(&dev->t10_pr.registration_lock); spin_unlock(&dev->dev_reservation_lock); return ret; } static int __core_scsi3_write_aptpl_to_file( struct se_device *dev, unsigned char *buf) { struct t10_wwn *wwn = &dev->t10_wwn; struct file *file; int flags = O_RDWR | O_CREAT | O_TRUNC; char *path; u32 pr_aptpl_buf_len; int ret; loff_t pos = 0; path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); if (!path) return -ENOMEM; file = filp_open(path, flags, 0600); if (IS_ERR(file)) { pr_err("filp_open(%s) for APTPL metadata" " failed\n", path); kfree(path); return PTR_ERR(file); } pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); if (ret < 0) pr_debug("Error writing APTPL metadata file: %s\n", path); fput(file); kfree(path); return (ret < 0) ? -EIO : 0; } /* * Clear the APTPL metadata if APTPL has been disabled, otherwise * write out the updated metadata to struct file for this SCSI device. */ static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) { unsigned char *buf; int rc, len = PR_APTPL_BUF_LEN; if (!aptpl) { char *null_buf = "No Registrations or Reservations\n"; rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); dev->t10_pr.pr_aptpl_active = 0; pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); if (rc) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; return 0; } retry: buf = vzalloc(len); if (!buf) return TCM_OUT_OF_RESOURCES; rc = core_scsi3_update_aptpl_buf(dev, buf, len); if (rc < 0) { vfree(buf); len *= 2; goto retry; } rc = __core_scsi3_write_aptpl_to_file(dev, buf); if (rc != 0) { pr_err("SPC-3 PR: Could not update APTPL\n"); vfree(buf); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } dev->t10_pr.pr_aptpl_active = 1; vfree(buf); pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); return 0; } static sense_reason_t core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) { struct se_session *se_sess = cmd->se_sess; struct se_device *dev = cmd->se_dev; struct se_lun *se_lun = cmd->se_lun; struct se_portal_group *se_tpg; struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; sense_reason_t ret = TCM_NO_SENSE; int pr_holder = 0, type; if (!se_sess || !se_lun) { pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } se_tpg = se_sess->se_tpg; if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { memset(&isid_buf[0], 0, PR_REG_ISID_LEN); se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], PR_REG_ISID_LEN); isid_ptr = &isid_buf[0]; } /* * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 */ pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); if (!pr_reg) { if (res_key) { pr_warn("SPC-3 PR: Reservation Key non-zero" " for SA REGISTER, returning CONFLICT\n"); return TCM_RESERVATION_CONFLICT; } /* * Do nothing but return GOOD status. */ if (!sa_res_key) return 0; if (!spec_i_pt) { /* * Perform the Service Action REGISTER on the Initiator * Port Endpoint that the PRO was received from on the * Logical Unit of the SCSI device server. */ if (core_scsi3_alloc_registration(cmd->se_dev, se_sess->se_node_acl, cmd->se_lun, NULL, cmd->orig_fe_lun, isid_ptr, sa_res_key, all_tg_pt, aptpl, register_type, 0)) { pr_err("Unable to allocate" " struct t10_pr_registration\n"); return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; } } else { /* * Register both the Initiator port that received * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI * TransportID from Parameter list and loop through * fabric dependent parameter list while calling * logic from of core_scsi3_alloc_registration() for * each TransportID provided SCSI Initiator Port/Device */ ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, isid_ptr, sa_res_key, all_tg_pt, aptpl); if (ret != 0) return ret; } return core_scsi3_update_and_write_aptpl(dev, aptpl); } /* ok, existing registration */ if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { pr_err("SPC-3 PR REGISTER: Received" " res_key: 0x%016Lx does not match" " existing SA REGISTER res_key:" " 0x%016Lx\n", res_key, pr_reg->pr_res_key); ret = TCM_RESERVATION_CONFLICT; goto out; } if (spec_i_pt) { pr_err("SPC-3 PR REGISTER: SPEC_I_PT" " set on a registered nexus\n"); ret = TCM_INVALID_PARAMETER_LIST; goto out; } /* * An existing ALL_TG_PT=1 registration being released * must also set ALL_TG_PT=1 in the incoming PROUT. */ if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" " registration exists, but ALL_TG_PT=1 bit not" " present in received PROUT\n"); ret = TCM_INVALID_CDB_FIELD; goto out; } /* * sa_res_key=1 Change Reservation Key for registered I_T Nexus. */ if (sa_res_key) { /* * Increment PRgeneration counter for struct se_device" * upon a successful REGISTER, see spc4r17 section 6.3.2 * READ_KEYS service action. */ pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); pr_reg->pr_res_key = sa_res_key; pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" " Key for %s to: 0x%016Lx PRgeneration:" " 0x%08x\n", cmd->se_tfo->fabric_name, (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", pr_reg->pr_reg_nacl->initiatorname, pr_reg->pr_res_key, pr_reg->pr_res_generation); } else { /* * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. */ type = pr_reg->pr_res_type; pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, pr_reg); if (pr_holder < 0) { ret = TCM_RESERVATION_CONFLICT; goto out; } spin_lock(&pr_tmpl->registration_lock); /* * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port * and matching pr_res_key. */ if (pr_reg->pr_reg_all_tg_pt) { list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { if (!pr_reg_p->pr_reg_all_tg_pt) continue; if (pr_reg_p->pr_res_key != res_key) continue; if (pr_reg == pr_reg_p) continue; if (strcmp(pr_reg->pr_reg_nacl->initiatorname, pr_reg_p->pr_reg_nacl->initiatorname)) continue; __core_scsi3_free_registration(dev, pr_reg_p, NULL, 0); } } /* * Release the calling I_T Nexus registration now.. */ __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); pr_reg = NULL; /* * From spc4r17, section 5.7.11.3 Unregistering * * If the persistent reservation is a registrants only * type, the device server shall establish a unit * attention condition for the initiator port associated * with every registered I_T nexus except for the I_T * nexus on which the PERSISTENT RESERVE OUT command was * received, with the additional sense code set to * RESERVATIONS RELEASED. */ if (pr_holder && (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, pr_reg_list) { target_ua_allocate_lun( pr_reg_p->pr_reg_nacl, pr_reg_p->pr_res_mapped_lun, 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); } } spin_unlock(&pr_tmpl->registration_lock); } ret = core_scsi3_update_and_write_aptpl(dev, aptpl); out: if (pr_reg) core_scsi3_put_pr_reg(pr_reg); return ret; } unsigned char *core_scsi3_pr_dump_type(int type) { switch (type) { case PR_TYPE_WRITE_EXCLUSIVE: return "Write Exclusive Access"; case PR_TYPE_EXCLUSIVE_ACCESS: return "Exclusive Access"; case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: return "Write Exclusive Access, Registrants Only"; case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: return "Exclusive Access, Registrants Only"; case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: return "Write Exclusive Access, All Registrants"; case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: return "Exclusive Access, All Registrants"; default: break; } return "Unknown SPC-3 PR Type"; } static sense_reason_t core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) { struct se_device *dev = cmd->se_dev; struct se_session *se_sess = cmd->se_sess; struct se_lun *se_lun = cmd->se_lun; struct t10_pr_registration *pr_reg, *pr_res_holder; struct t10_reservation *pr_tmpl = &dev->t10_pr; char i_buf[PR_REG_ISID_ID_LEN]; sense_reason_t ret; memset(i_buf, 0, PR_REG_ISID_ID_LEN); if (!se_sess || !se_lun) { pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * Locate the existing *pr_reg via struct se_node_acl pointers */ pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, se_sess); if (!pr_reg) { pr_err("SPC-3 PR: Unable to locate" " PR_REGISTERED *pr_reg for RESERVE\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * From spc4r17 Section 5.7.9: Reserving: * * An application client creates a persistent reservation by issuing * a PERSISTENT RESERVE OUT command with RESERVE service action through * a registered I_T nexus with the following parameters: * a) RESERVATION KEY set to the value of the reservation key that is * registered with the logical unit for the I_T nexus; and */ if (res_key != pr_reg->pr_res_key) { pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" " does not match existing SA REGISTER res_key:" " 0x%016Lx\n", res_key, pr_reg->pr_res_key); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * From spc4r17 Section 5.7.9: Reserving: * * From above: * b) TYPE field and SCOPE field set to the persistent reservation * being created. * * Only one persistent reservation is allowed at a time per logical unit * and that persistent reservation has a scope of LU_SCOPE. */ if (scope != PR_SCOPE_LU_SCOPE) { pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); ret = TCM_INVALID_PARAMETER_LIST; goto out_put_pr_reg; } /* * See if we have an existing PR reservation holder pointer at * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration * *pr_res_holder. */ spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (pr_res_holder) { /* * From spc4r17 Section 5.7.9: Reserving: * * If the device server receives a PERSISTENT RESERVE OUT * command from an I_T nexus other than a persistent reservation * holder (see 5.7.10) that attempts to create a persistent * reservation when a persistent reservation already exists for * the logical unit, then the command shall be completed with * RESERVATION CONFLICT status. */ if (!is_reservation_holder(pr_res_holder, pr_reg)) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; pr_err("SPC-3 PR: Attempted RESERVE from" " [%s]: %s while reservation already held by" " [%s]: %s, returning RESERVATION_CONFLICT\n", cmd->se_tfo->fabric_name, se_sess->se_node_acl->initiatorname, pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, pr_res_holder->pr_reg_nacl->initiatorname); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * From spc4r17 Section 5.7.9: Reserving: * * If a persistent reservation holder attempts to modify the * type or scope of an existing persistent reservation, the * command shall be completed with RESERVATION CONFLICT status. */ if ((pr_res_holder->pr_res_type != type) || (pr_res_holder->pr_res_scope != scope)) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; pr_err("SPC-3 PR: Attempted RESERVE from" " [%s]: %s trying to change TYPE and/or SCOPE," " while reservation already held by [%s]: %s," " returning RESERVATION_CONFLICT\n", cmd->se_tfo->fabric_name, se_sess->se_node_acl->initiatorname, pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, pr_res_holder->pr_reg_nacl->initiatorname); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * From spc4r17 Section 5.7.9: Reserving: * * If the device server receives a PERSISTENT RESERVE OUT * command with RESERVE service action where the TYPE field and * the SCOPE field contain the same values as the existing type * and scope from a persistent reservation holder, it shall not * make any change to the existing persistent reservation and * shall completethe command with GOOD status. */ spin_unlock(&dev->dev_reservation_lock); ret = 0; goto out_put_pr_reg; } /* * Otherwise, our *pr_reg becomes the PR reservation holder for said * TYPE/SCOPE. Also set the received scope and type in *pr_reg. */ pr_reg->pr_res_scope = scope; pr_reg->pr_res_type = type; pr_reg->pr_res_holder = 1; dev->dev_pr_res_holder = pr_reg; core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" " reservation holder TYPE: %s ALL_TG_PT: %d\n", cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", cmd->se_tfo->fabric_name, se_sess->se_node_acl->initiatorname, i_buf); spin_unlock(&dev->dev_reservation_lock); if (pr_tmpl->pr_aptpl_active) core_scsi3_update_and_write_aptpl(cmd->se_dev, true); ret = 0; out_put_pr_reg: core_scsi3_put_pr_reg(pr_reg); return ret; } static sense_reason_t core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) { switch (type) { case PR_TYPE_WRITE_EXCLUSIVE: case PR_TYPE_EXCLUSIVE_ACCESS: case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: return core_scsi3_pro_reserve(cmd, type, scope, res_key); default: pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" " 0x%02x\n", type); return TCM_INVALID_CDB_FIELD; } } static void __core_scsi3_complete_pro_release( struct se_device *dev, struct se_node_acl *se_nacl, struct t10_pr_registration *pr_reg, int explicit, int unreg) { const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; char i_buf[PR_REG_ISID_ID_LEN]; int pr_res_type = 0, pr_res_scope = 0; lockdep_assert_held(&dev->dev_reservation_lock); memset(i_buf, 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); /* * Go ahead and release the current PR reservation holder. * If an All Registrants reservation is currently active and * a unregister operation is requested, replace the current * dev_pr_res_holder with another active registration. */ if (dev->dev_pr_res_holder) { pr_res_type = dev->dev_pr_res_holder->pr_res_type; pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; dev->dev_pr_res_holder->pr_res_type = 0; dev->dev_pr_res_holder->pr_res_scope = 0; dev->dev_pr_res_holder->pr_res_holder = 0; dev->dev_pr_res_holder = NULL; } if (!unreg) goto out; spin_lock(&dev->t10_pr.registration_lock); list_del_init(&pr_reg->pr_reg_list); /* * If the I_T nexus is a reservation holder, the persistent reservation * is of an all registrants type, and the I_T nexus is the last remaining * registered I_T nexus, then the device server shall also release the * persistent reservation. */ if (!list_empty(&dev->t10_pr.registration_list) && ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { dev->dev_pr_res_holder = list_entry(dev->t10_pr.registration_list.next, struct t10_pr_registration, pr_reg_list); dev->dev_pr_res_holder->pr_res_type = pr_res_type; dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; dev->dev_pr_res_holder->pr_res_holder = 1; } spin_unlock(&dev->t10_pr.registration_lock); out: if (!dev->dev_pr_res_holder) { pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" " reservation holder TYPE: %s ALL_TG_PT: %d\n", tfo->fabric_name, (explicit) ? "explicit" : "implicit", core_scsi3_pr_dump_type(pr_res_type), (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); } pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", tfo->fabric_name, se_nacl->initiatorname, i_buf); /* * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE */ pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; } static sense_reason_t core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, u64 res_key) { struct se_device *dev = cmd->se_dev; struct se_session *se_sess = cmd->se_sess; struct se_lun *se_lun = cmd->se_lun; struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; struct t10_reservation *pr_tmpl = &dev->t10_pr; sense_reason_t ret = 0; if (!se_sess || !se_lun) { pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * Locate the existing *pr_reg via struct se_node_acl pointers */ pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); if (!pr_reg) { pr_err("SPC-3 PR: Unable to locate" " PR_REGISTERED *pr_reg for RELEASE\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * From spc4r17 Section 5.7.11.2 Releasing: * * If there is no persistent reservation or in response to a persistent * reservation release request from a registered I_T nexus that is not a * persistent reservation holder (see 5.7.10), the device server shall * do the following: * * a) Not release the persistent reservation, if any; * b) Not remove any registrations; and * c) Complete the command with GOOD status. */ spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (!pr_res_holder) { /* * No persistent reservation, return GOOD status. */ spin_unlock(&dev->dev_reservation_lock); goto out_put_pr_reg; } if (!is_reservation_holder(pr_res_holder, pr_reg)) { /* * Release request from a registered I_T nexus that is not a * persistent reservation holder. return GOOD status. */ spin_unlock(&dev->dev_reservation_lock); goto out_put_pr_reg; } /* * From spc4r17 Section 5.7.11.2 Releasing: * * Only the persistent reservation holder (see 5.7.10) is allowed to * release a persistent reservation. * * An application client releases the persistent reservation by issuing * a PERSISTENT RESERVE OUT command with RELEASE service action through * an I_T nexus that is a persistent reservation holder with the * following parameters: * * a) RESERVATION KEY field set to the value of the reservation key * that is registered with the logical unit for the I_T nexus; */ if (res_key != pr_reg->pr_res_key) { pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" " does not match existing SA REGISTER res_key:" " 0x%016Lx\n", res_key, pr_reg->pr_res_key); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * From spc4r17 Section 5.7.11.2 Releasing and above: * * b) TYPE field and SCOPE field set to match the persistent * reservation being released. */ if ((pr_res_holder->pr_res_type != type) || (pr_res_holder->pr_res_scope != scope)) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; pr_err("SPC-3 PR RELEASE: Attempted to release" " reservation from [%s]: %s with different TYPE " "and/or SCOPE while reservation already held by" " [%s]: %s, returning RESERVATION_CONFLICT\n", cmd->se_tfo->fabric_name, se_sess->se_node_acl->initiatorname, pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, pr_res_holder->pr_reg_nacl->initiatorname); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * In response to a persistent reservation release request from the * persistent reservation holder the device server shall perform a * release by doing the following as an uninterrupted series of actions: * a) Release the persistent reservation; * b) Not remove any registration(s); * c) If the released persistent reservation is a registrants only type * or all registrants type persistent reservation, * the device server shall establish a unit attention condition for * the initiator port associated with every regis- * tered I_T nexus other than I_T nexus on which the PERSISTENT * RESERVE OUT command with RELEASE service action was received, * with the additional sense code set to RESERVATIONS RELEASED; and * d) If the persistent reservation is of any other type, the device * server shall not establish a unit attention condition. */ __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, pr_reg, 1, 0); spin_unlock(&dev->dev_reservation_lock); if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { /* * If no UNIT ATTENTION conditions will be established for * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS * go ahead and check for APTPL=1 update+write below */ goto write_aptpl; } spin_lock(&pr_tmpl->registration_lock); list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, pr_reg_list) { /* * Do not establish a UNIT ATTENTION condition * for the calling I_T Nexus */ if (pr_reg_p == pr_reg) continue; target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, pr_reg_p->pr_res_mapped_lun, 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); } spin_unlock(&pr_tmpl->registration_lock); write_aptpl: if (pr_tmpl->pr_aptpl_active) core_scsi3_update_and_write_aptpl(cmd->se_dev, true); out_put_pr_reg: core_scsi3_put_pr_reg(pr_reg); return ret; } static sense_reason_t core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) { struct se_device *dev = cmd->se_dev; struct se_node_acl *pr_reg_nacl; struct se_session *se_sess = cmd->se_sess; struct t10_reservation *pr_tmpl = &dev->t10_pr; struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; u64 pr_res_mapped_lun = 0; int calling_it_nexus = 0; /* * Locate the existing *pr_reg via struct se_node_acl pointers */ pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, se_sess); if (!pr_reg_n) { pr_err("SPC-3 PR: Unable to locate" " PR_REGISTERED *pr_reg for CLEAR\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * From spc4r17 section 5.7.11.6, Clearing: * * Any application client may release the persistent reservation and * remove all registrations from a device server by issuing a * PERSISTENT RESERVE OUT command with CLEAR service action through a * registered I_T nexus with the following parameter: * * a) RESERVATION KEY field set to the value of the reservation key * that is registered with the logical unit for the I_T nexus. */ if (res_key != pr_reg_n->pr_res_key) { pr_err("SPC-3 PR REGISTER: Received" " res_key: 0x%016Lx does not match" " existing SA REGISTER res_key:" " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); core_scsi3_put_pr_reg(pr_reg_n); return TCM_RESERVATION_CONFLICT; } /* * a) Release the persistent reservation, if any; */ spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (pr_res_holder) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; __core_scsi3_complete_pro_release(dev, pr_res_nacl, pr_res_holder, 0, 0); } spin_unlock(&dev->dev_reservation_lock); /* * b) Remove all registration(s) (see spc4r17 5.7.7); */ spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; pr_reg_nacl = pr_reg->pr_reg_nacl; pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; __core_scsi3_free_registration(dev, pr_reg, NULL, calling_it_nexus); /* * e) Establish a unit attention condition for the initiator * port associated with every registered I_T nexus other * than the I_T nexus on which the PERSISTENT RESERVE OUT * command with CLEAR service action was received, with the * additional sense code set to RESERVATIONS PREEMPTED. */ if (!calling_it_nexus) target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); } spin_unlock(&pr_tmpl->registration_lock); pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", cmd->se_tfo->fabric_name); core_scsi3_update_and_write_aptpl(cmd->se_dev, false); core_scsi3_pr_generation(dev); return 0; } static void __core_scsi3_complete_pro_preempt( struct se_device *dev, struct t10_pr_registration *pr_reg, struct list_head *preempt_and_abort_list, int type, int scope, enum preempt_type preempt_type) { struct se_node_acl *nacl = pr_reg->pr_reg_nacl; const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; char i_buf[PR_REG_ISID_ID_LEN]; lockdep_assert_held(&dev->dev_reservation_lock); memset(i_buf, 0, PR_REG_ISID_ID_LEN); core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); /* * Do an implicit RELEASE of the existing reservation. */ if (dev->dev_pr_res_holder) __core_scsi3_complete_pro_release(dev, nacl, dev->dev_pr_res_holder, 0, 0); dev->dev_pr_res_holder = pr_reg; pr_reg->pr_res_holder = 1; pr_reg->pr_res_type = type; pr_reg->pr_res_scope = scope; pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" " reservation holder TYPE: %s ALL_TG_PT: %d\n", tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", core_scsi3_pr_dump_type(type), (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", nacl->initiatorname, i_buf); /* * For PREEMPT_AND_ABORT, add the preempting reservation's * struct t10_pr_registration to the list that will be compared * against received CDBs.. */ if (preempt_and_abort_list) list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); } static void core_scsi3_release_preempt_and_abort( struct list_head *preempt_and_abort_list, struct t10_pr_registration *pr_reg_holder) { struct t10_pr_registration *pr_reg, *pr_reg_tmp; list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, pr_reg_abort_list) { list_del(&pr_reg->pr_reg_abort_list); if (pr_reg_holder == pr_reg) continue; if (pr_reg->pr_res_holder) { pr_warn("pr_reg->pr_res_holder still set\n"); continue; } pr_reg->pr_reg_deve = NULL; pr_reg->pr_reg_nacl = NULL; kmem_cache_free(t10_pr_reg_cache, pr_reg); } } static sense_reason_t core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) { struct se_device *dev = cmd->se_dev; struct se_node_acl *pr_reg_nacl; struct se_session *se_sess = cmd->se_sess; LIST_HEAD(preempt_and_abort_list); struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; struct t10_reservation *pr_tmpl = &dev->t10_pr; u64 pr_res_mapped_lun = 0; int all_reg = 0, calling_it_nexus = 0; bool sa_res_key_unmatched = sa_res_key != 0; int prh_type = 0, prh_scope = 0; if (!se_sess) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, se_sess); if (!pr_reg_n) { pr_err("SPC-3 PR: Unable to locate" " PR_REGISTERED *pr_reg for PREEMPT%s\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); return TCM_RESERVATION_CONFLICT; } if (pr_reg_n->pr_res_key != res_key) { core_scsi3_put_pr_reg(pr_reg_n); return TCM_RESERVATION_CONFLICT; } if (scope != PR_SCOPE_LU_SCOPE) { pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); core_scsi3_put_pr_reg(pr_reg_n); return TCM_INVALID_PARAMETER_LIST; } spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (pr_res_holder && ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) all_reg = 1; if (!all_reg && !sa_res_key) { spin_unlock(&dev->dev_reservation_lock); core_scsi3_put_pr_reg(pr_reg_n); return TCM_INVALID_PARAMETER_LIST; } /* * From spc4r17, section 5.7.11.4.4 Removing Registrations: * * If the SERVICE ACTION RESERVATION KEY field does not identify a * persistent reservation holder or there is no persistent reservation * holder (i.e., there is no persistent reservation), then the device * server shall perform a preempt by doing the following in an * uninterrupted series of actions. (See below..) */ if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { /* * No existing or SA Reservation Key matching reservations.. * * PROUT SA PREEMPT with All Registrant type reservations are * allowed to be processed without a matching SA Reservation Key */ spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { /* * Removing of registrations in non all registrants * type reservations without a matching SA reservation * key. * * a) Remove the registrations for all I_T nexuses * specified by the SERVICE ACTION RESERVATION KEY * field; * b) Ignore the contents of the SCOPE and TYPE fields; * c) Process tasks as defined in 5.7.1; and * d) Establish a unit attention condition for the * initiator port associated with every I_T nexus * that lost its registration other than the I_T * nexus on which the PERSISTENT RESERVE OUT command * was received, with the additional sense code set * to REGISTRATIONS PREEMPTED. */ if (!all_reg) { if (pr_reg->pr_res_key != sa_res_key) continue; sa_res_key_unmatched = false; calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; pr_reg_nacl = pr_reg->pr_reg_nacl; pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; __core_scsi3_free_registration(dev, pr_reg, (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, calling_it_nexus); } else { /* * Case for any existing all registrants type * reservation, follow logic in spc4r17 section * 5.7.11.4 Preempting, Table 52 and Figure 7. * * For a ZERO SA Reservation key, release * all other registrations and do an implicit * release of active persistent reservation. * * For a non-ZERO SA Reservation key, only * release the matching reservation key from * registrations. */ if ((sa_res_key) && (pr_reg->pr_res_key != sa_res_key)) continue; sa_res_key_unmatched = false; calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; if (calling_it_nexus) continue; pr_reg_nacl = pr_reg->pr_reg_nacl; pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; __core_scsi3_free_registration(dev, pr_reg, (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 0); } if (!calling_it_nexus) target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, ASCQ_2AH_REGISTRATIONS_PREEMPTED); } spin_unlock(&pr_tmpl->registration_lock); /* * If a PERSISTENT RESERVE OUT with a PREEMPT service action or * a PREEMPT AND ABORT service action sets the SERVICE ACTION * RESERVATION KEY field to a value that does not match any * registered reservation key, then the device server shall * complete the command with RESERVATION CONFLICT status. */ if (sa_res_key_unmatched) { spin_unlock(&dev->dev_reservation_lock); core_scsi3_put_pr_reg(pr_reg_n); return TCM_RESERVATION_CONFLICT; } /* * For an existing all registrants type reservation * with a zero SA rservation key, preempt the existing * reservation with the new PR type and scope. */ if (pr_res_holder && all_reg && !(sa_res_key)) { __core_scsi3_complete_pro_preempt(dev, pr_reg_n, (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, type, scope, preempt_type); if (preempt_type == PREEMPT_AND_ABORT) core_scsi3_release_preempt_and_abort( &preempt_and_abort_list, pr_reg_n); } spin_unlock(&dev->dev_reservation_lock); if (pr_tmpl->pr_aptpl_active) core_scsi3_update_and_write_aptpl(cmd->se_dev, true); core_scsi3_put_pr_reg(pr_reg_n); core_scsi3_pr_generation(cmd->se_dev); return 0; } /* * The PREEMPTing SA reservation key matches that of the * existing persistent reservation, first, we check if * we are preempting our own reservation. * From spc4r17, section 5.7.11.4.3 Preempting * persistent reservations and registration handling * * If an all registrants persistent reservation is not * present, it is not an error for the persistent * reservation holder to preempt itself (i.e., a * PERSISTENT RESERVE OUT with a PREEMPT service action * or a PREEMPT AND ABORT service action with the * SERVICE ACTION RESERVATION KEY value equal to the * persistent reservation holder's reservation key that * is received from the persistent reservation holder). * In that case, the device server shall establish the * new persistent reservation and maintain the * registration. */ prh_type = pr_res_holder->pr_res_type; prh_scope = pr_res_holder->pr_res_scope; /* * If the SERVICE ACTION RESERVATION KEY field identifies a * persistent reservation holder (see 5.7.10), the device * server shall perform a preempt by doing the following as * an uninterrupted series of actions: * * a) Release the persistent reservation for the holder * identified by the SERVICE ACTION RESERVATION KEY field; */ if (pr_reg_n != pr_res_holder) __core_scsi3_complete_pro_release(dev, pr_res_holder->pr_reg_nacl, dev->dev_pr_res_holder, 0, 0); /* * b) Remove the registrations for all I_T nexuses identified * by the SERVICE ACTION RESERVATION KEY field, except the * I_T nexus that is being used for the PERSISTENT RESERVE * OUT command. If an all registrants persistent reservation * is present and the SERVICE ACTION RESERVATION KEY field * is set to zero, then all registrations shall be removed * except for that of the I_T nexus that is being used for * the PERSISTENT RESERVE OUT command; */ spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; if (calling_it_nexus) continue; if (pr_reg->pr_res_key != sa_res_key) continue; pr_reg_nacl = pr_reg->pr_reg_nacl; pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; __core_scsi3_free_registration(dev, pr_reg, (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, calling_it_nexus); /* * e) Establish a unit attention condition for the initiator * port associated with every I_T nexus that lost its * persistent reservation and/or registration, with the * additional sense code set to REGISTRATIONS PREEMPTED; */ target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, ASCQ_2AH_REGISTRATIONS_PREEMPTED); } spin_unlock(&pr_tmpl->registration_lock); /* * c) Establish a persistent reservation for the preempting * I_T nexus using the contents of the SCOPE and TYPE fields; */ __core_scsi3_complete_pro_preempt(dev, pr_reg_n, (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, type, scope, preempt_type); /* * d) Process tasks as defined in 5.7.1; * e) See above.. * f) If the type or scope has changed, then for every I_T nexus * whose reservation key was not removed, except for the I_T * nexus on which the PERSISTENT RESERVE OUT command was * received, the device server shall establish a unit * attention condition for the initiator port associated with * that I_T nexus, with the additional sense code set to * RESERVATIONS RELEASED. If the type or scope have not * changed, then no unit attention condition(s) shall be * established for this reason. */ if ((prh_type != type) || (prh_scope != scope)) { spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; if (calling_it_nexus) continue; target_ua_allocate_lun(pr_reg->pr_reg_nacl, pr_reg->pr_res_mapped_lun, 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); } spin_unlock(&pr_tmpl->registration_lock); } spin_unlock(&dev->dev_reservation_lock); /* * Call LUN_RESET logic upon list of struct t10_pr_registration, * All received CDBs for the matching existing reservation and * registrations undergo ABORT_TASK logic. * * From there, core_scsi3_release_preempt_and_abort() will * release every registration in the list (which have already * been removed from the primary pr_reg list), except the * new persistent reservation holder, the calling Initiator Port. */ if (preempt_type == PREEMPT_AND_ABORT) { core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, pr_reg_n); } if (pr_tmpl->pr_aptpl_active) core_scsi3_update_and_write_aptpl(cmd->se_dev, true); core_scsi3_put_pr_reg(pr_reg_n); core_scsi3_pr_generation(cmd->se_dev); return 0; } static sense_reason_t core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) { switch (type) { case PR_TYPE_WRITE_EXCLUSIVE: case PR_TYPE_EXCLUSIVE_ACCESS: case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: return core_scsi3_pro_preempt(cmd, type, scope, res_key, sa_res_key, preempt_type); default: pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); return TCM_INVALID_CDB_FIELD; } } static sense_reason_t core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, int aptpl, int unreg) { struct se_session *se_sess = cmd->se_sess; struct se_device *dev = cmd->se_dev; struct se_dev_entry *dest_se_deve = NULL; struct se_lun *se_lun = cmd->se_lun, *tmp_lun; struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; struct se_portal_group *se_tpg, *dest_se_tpg = NULL; const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char *buf; const unsigned char *initiator_str; char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; u32 tid_len, tmp_tid_len; int new_reg = 0, type, scope, matching_iname; sense_reason_t ret; unsigned short rtpi; unsigned char proto_ident; if (!se_sess || !se_lun) { pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } memset(i_buf, 0, PR_REG_ISID_ID_LEN); se_tpg = se_sess->se_tpg; tf_ops = se_tpg->se_tpg_tfo; /* * Follow logic from spc4r17 Section 5.7.8, Table 50 -- * Register behaviors for a REGISTER AND MOVE service action * * Locate the existing *pr_reg via struct se_node_acl pointers */ pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, se_sess); if (!pr_reg) { pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" " *pr_reg for REGISTER_AND_MOVE\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } /* * The provided reservation key much match the existing reservation key * provided during this initiator's I_T nexus registration. */ if (res_key != pr_reg->pr_res_key) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" " res_key: 0x%016Lx does not match existing SA REGISTER" " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } /* * The service active reservation key needs to be non zero */ if (!sa_res_key) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" " sa_res_key\n"); ret = TCM_INVALID_PARAMETER_LIST; goto out_put_pr_reg; } /* * Determine the Relative Target Port Identifier where the reservation * will be moved to for the TransportID containing SCSI initiator WWN * information. */ buf = transport_kmap_data_sg(cmd); if (!buf) { ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; goto out_put_pr_reg; } rtpi = get_unaligned_be16(&buf[18]); tid_len = get_unaligned_be32(&buf[20]); transport_kunmap_data_sg(cmd); buf = NULL; if ((tid_len + 24) != cmd->data_length) { pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" " does not equal CDB data_length: %u\n", tid_len, cmd->data_length); ret = TCM_INVALID_PARAMETER_LIST; goto out_put_pr_reg; } spin_lock(&dev->se_port_lock); list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { if (tmp_lun->lun_rtpi != rtpi) continue; dest_se_tpg = tmp_lun->lun_tpg; dest_tf_ops = dest_se_tpg->se_tpg_tfo; if (!dest_tf_ops) continue; atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); spin_unlock(&dev->se_port_lock); if (core_scsi3_tpg_depend_item(dest_se_tpg)) { pr_err("core_scsi3_tpg_depend_item() failed" " for dest_se_tpg\n"); atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out_put_pr_reg; } spin_lock(&dev->se_port_lock); break; } spin_unlock(&dev->se_port_lock); if (!dest_se_tpg || !dest_tf_ops) { pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" " fabric ops from Relative Target Port Identifier:" " %hu\n", rtpi); ret = TCM_INVALID_PARAMETER_LIST; goto out_put_pr_reg; } buf = transport_kmap_data_sg(cmd); if (!buf) { ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; goto out_put_pr_reg; } proto_ident = (buf[24] & 0x0f); pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" " 0x%02x\n", proto_ident); if (proto_ident != dest_se_tpg->proto_id) { pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" " proto_ident: 0x%02x does not match ident: 0x%02x" " from fabric: %s\n", proto_ident, dest_se_tpg->proto_id, dest_tf_ops->fabric_name); ret = TCM_INVALID_PARAMETER_LIST; goto out; } initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, &buf[24], &tmp_tid_len, &iport_ptr); if (!initiator_str) { pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" " initiator_str from Transport ID\n"); ret = TCM_INVALID_PARAMETER_LIST; goto out; } transport_kunmap_data_sg(cmd); buf = NULL; pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? "port" : "device", initiator_str, (iport_ptr != NULL) ? iport_ptr : ""); /* * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service * action specifies a TransportID that is the same as the initiator port * of the I_T nexus for the command received, then the command shall * be terminated with CHECK CONDITION status, with the sense key set to * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD * IN PARAMETER LIST. */ pr_reg_nacl = pr_reg->pr_reg_nacl; matching_iname = (!strcmp(initiator_str, pr_reg_nacl->initiatorname)) ? 1 : 0; if (!matching_iname) goto after_iport_check; if (!iport_ptr || !pr_reg->isid_present_at_reg) { pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" " matches: %s on received I_T Nexus\n", initiator_str, pr_reg_nacl->initiatorname); ret = TCM_INVALID_PARAMETER_LIST; goto out; } if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" " matches: %s %s on received I_T Nexus\n", initiator_str, iport_ptr, pr_reg_nacl->initiatorname, pr_reg->pr_reg_isid); ret = TCM_INVALID_PARAMETER_LIST; goto out; } after_iport_check: /* * Locate the destination struct se_node_acl from the received Transport ID */ mutex_lock(&dest_se_tpg->acl_node_mutex); dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, initiator_str); if (dest_node_acl) atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); mutex_unlock(&dest_se_tpg->acl_node_mutex); if (!dest_node_acl) { pr_err("Unable to locate %s dest_node_acl for" " TransportID%s\n", dest_tf_ops->fabric_name, initiator_str); ret = TCM_INVALID_PARAMETER_LIST; goto out; } if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { pr_err("core_scsi3_nodeacl_depend_item() for" " dest_node_acl\n"); atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); dest_node_acl = NULL; ret = TCM_INVALID_PARAMETER_LIST; goto out; } pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" " %s from TransportID\n", dest_tf_ops->fabric_name, dest_node_acl->initiatorname); /* * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET * PORT IDENTIFIER. */ dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); if (!dest_se_deve) { pr_err("Unable to locate %s dest_se_deve from RTPI:" " %hu\n", dest_tf_ops->fabric_name, rtpi); ret = TCM_INVALID_PARAMETER_LIST; goto out; } if (core_scsi3_lunacl_depend_item(dest_se_deve)) { pr_err("core_scsi3_lunacl_depend_item() failed\n"); kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); dest_se_deve = NULL; ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; goto out; } pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" " ACL for dest_se_deve->mapped_lun: %llu\n", dest_tf_ops->fabric_name, dest_node_acl->initiatorname, dest_se_deve->mapped_lun); /* * A persistent reservation needs to already existing in order to * successfully complete the REGISTER_AND_MOVE service action.. */ spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (!pr_res_holder) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" " currently held\n"); spin_unlock(&dev->dev_reservation_lock); ret = TCM_INVALID_CDB_FIELD; goto out; } /* * The received on I_T Nexus must be the reservation holder. * * From spc4r17 section 5.7.8 Table 50 -- * Register behaviors for a REGISTER AND MOVE service action */ if (!is_reservation_holder(pr_res_holder, pr_reg)) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" " Nexus is not reservation holder\n"); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out; } /* * From spc4r17 section 5.7.8: registering and moving reservation * * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service * action is received and the established persistent reservation is a * Write Exclusive - All Registrants type or Exclusive Access - * All Registrants type reservation, then the command shall be completed * with RESERVATION CONFLICT status. */ if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" " reservation for type: %s\n", core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); spin_unlock(&dev->dev_reservation_lock); ret = TCM_RESERVATION_CONFLICT; goto out; } pr_res_nacl = pr_res_holder->pr_reg_nacl; /* * b) Ignore the contents of the (received) SCOPE and TYPE fields; */ type = pr_res_holder->pr_res_type; scope = pr_res_holder->pr_res_type; /* * c) Associate the reservation key specified in the SERVICE ACTION * RESERVATION KEY field with the I_T nexus specified as the * destination of the register and move, where: * A) The I_T nexus is specified by the TransportID and the * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and * B) Regardless of the TransportID format used, the association for * the initiator port is based on either the initiator port name * (see 3.1.71) on SCSI transport protocols where port names are * required or the initiator port identifier (see 3.1.70) on SCSI * transport protocols where port names are not required; * d) Register the reservation key specified in the SERVICE ACTION * RESERVATION KEY field; * e) Retain the reservation key specified in the SERVICE ACTION * RESERVATION KEY field and associated information; * * Also, It is not an error for a REGISTER AND MOVE service action to * register an I_T nexus that is already registered with the same * reservation key or a different reservation key. */ dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, iport_ptr); if (!dest_pr_reg) { struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, kref_read(&dest_se_deve->pr_kref) != 0); spin_unlock(&dev->dev_reservation_lock); if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, dest_lun, dest_se_deve, dest_se_deve->mapped_lun, iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; goto out; } spin_lock(&dev->dev_reservation_lock); dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, iport_ptr); new_reg = 1; } /* * f) Release the persistent reservation for the persistent reservation * holder (i.e., the I_T nexus on which the */ __core_scsi3_complete_pro_release(dev, pr_res_nacl, dev->dev_pr_res_holder, 0, 0); /* * g) Move the persistent reservation to the specified I_T nexus using * the same scope and type as the persistent reservation released in * item f); and */ dev->dev_pr_res_holder = dest_pr_reg; dest_pr_reg->pr_res_holder = 1; dest_pr_reg->pr_res_type = type; pr_reg->pr_res_scope = scope; core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); /* * Increment PRGeneration for existing registrations.. */ if (!new_reg) dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; spin_unlock(&dev->dev_reservation_lock); pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" " created new reservation holder TYPE: %s on object RTPI:" " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, core_scsi3_pr_dump_type(type), rtpi, dest_pr_reg->pr_res_generation); pr_debug("SPC-3 PR Successfully moved reservation from" " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", tf_ops->fabric_name, pr_reg_nacl->initiatorname, i_buf, dest_tf_ops->fabric_name, dest_node_acl->initiatorname, (iport_ptr != NULL) ? iport_ptr : ""); /* * It is now safe to release configfs group dependencies for destination * of Transport ID Initiator Device/Port Identifier */ core_scsi3_lunacl_undepend_item(dest_se_deve); core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_se_tpg); /* * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T * nexus on which PERSISTENT RESERVE OUT command was received. */ if (unreg) { spin_lock(&pr_tmpl->registration_lock); __core_scsi3_free_registration(dev, pr_reg, NULL, 1); spin_unlock(&pr_tmpl->registration_lock); } else core_scsi3_put_pr_reg(pr_reg); core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); core_scsi3_put_pr_reg(dest_pr_reg); return 0; out: if (buf) transport_kunmap_data_sg(cmd); if (dest_se_deve) core_scsi3_lunacl_undepend_item(dest_se_deve); if (dest_node_acl) core_scsi3_nodeacl_undepend_item(dest_node_acl); core_scsi3_tpg_undepend_item(dest_se_tpg); out_put_pr_reg: core_scsi3_put_pr_reg(pr_reg); return ret; } /* * See spc4r17 section 6.14 Table 170 */ sense_reason_t target_scsi3_emulate_pr_out(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; unsigned char *cdb = &cmd->t_task_cdb[0]; unsigned char *buf; u64 res_key, sa_res_key; int sa, scope, type, aptpl; int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; sense_reason_t ret; /* * Following spc2r20 5.5.1 Reservations overview: * * If a logical unit has been reserved by any RESERVE command and is * still reserved by any initiator, all PERSISTENT RESERVE IN and all * PERSISTENT RESERVE OUT commands shall conflict regardless of * initiator or service action and shall terminate with a RESERVATION * CONFLICT status. */ if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { pr_err("Received PERSISTENT_RESERVE CDB while legacy" " SPC-2 reservation is held, returning" " RESERVATION_CONFLICT\n"); return TCM_RESERVATION_CONFLICT; } /* * FIXME: A NULL struct se_session pointer means an this is not coming from * a $FABRIC_MOD's nexus, but from internal passthrough ops. */ if (!cmd->se_sess) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; if (cmd->data_length < 24) { pr_warn("SPC-PR: Received PR OUT parameter list" " length too small: %u\n", cmd->data_length); return TCM_PARAMETER_LIST_LENGTH_ERROR; } /* * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) */ sa = (cdb[1] & 0x1f); scope = (cdb[2] & 0xf0); type = (cdb[2] & 0x0f); buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; /* * From PERSISTENT_RESERVE_OUT parameter list (payload) */ res_key = get_unaligned_be64(&buf[0]); sa_res_key = get_unaligned_be64(&buf[8]); /* * REGISTER_AND_MOVE uses a different SA parameter list containing * SCSI TransportIDs. */ if (sa != PRO_REGISTER_AND_MOVE) { spec_i_pt = (buf[20] & 0x08); all_tg_pt = (buf[20] & 0x04); aptpl = (buf[20] & 0x01); } else { aptpl = (buf[17] & 0x01); unreg = (buf[17] & 0x02); } /* * If the backend device has been configured to force APTPL metadata * write-out, go ahead and propigate aptpl=1 down now. */ if (dev->dev_attrib.force_pr_aptpl) aptpl = 1; transport_kunmap_data_sg(cmd); buf = NULL; /* * SPEC_I_PT=1 is only valid for Service action: REGISTER */ if (spec_i_pt && (sa != PRO_REGISTER)) return TCM_INVALID_PARAMETER_LIST; /* * From spc4r17 section 6.14: * * If the SPEC_I_PT bit is set to zero, the service action is not * REGISTER AND MOVE, and the parameter list length is not 24, then * the command shall be terminated with CHECK CONDITION status, with * the sense key set to ILLEGAL REQUEST, and the additional sense * code set to PARAMETER LIST LENGTH ERROR. */ if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && (cmd->data_length != 24)) { pr_warn("SPC-PR: Received PR OUT illegal parameter" " list length: %u\n", cmd->data_length); return TCM_PARAMETER_LIST_LENGTH_ERROR; } /* * (core_scsi3_emulate_pro_* function parameters * are defined by spc4r17 Table 174: * PERSISTENT_RESERVE_OUT service actions and valid parameters. */ switch (sa) { case PRO_REGISTER: ret = core_scsi3_emulate_pro_register(cmd, res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); break; case PRO_RESERVE: ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); break; case PRO_RELEASE: ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); break; case PRO_CLEAR: ret = core_scsi3_emulate_pro_clear(cmd, res_key); break; case PRO_PREEMPT: ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, res_key, sa_res_key, PREEMPT); break; case PRO_PREEMPT_AND_ABORT: ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, res_key, sa_res_key, PREEMPT_AND_ABORT); break; case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: ret = core_scsi3_emulate_pro_register(cmd, 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); break; case PRO_REGISTER_AND_MOVE: ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, sa_res_key, aptpl, unreg); break; default: pr_err("Unknown PERSISTENT_RESERVE_OUT service" " action: 0x%02x\n", sa); return TCM_INVALID_CDB_FIELD; } if (!ret) target_complete_cmd(cmd, GOOD); return ret; } /* * PERSISTENT_RESERVE_IN Service Action READ_KEYS * * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 */ static sense_reason_t core_scsi3_pri_read_keys(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct t10_pr_registration *pr_reg; unsigned char *buf; u32 add_len = 0, off = 8; if (cmd->data_length < 8) { pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" " too small\n", cmd->data_length); return TCM_INVALID_CDB_FIELD; } buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; put_unaligned_be32(dev->t10_pr.pr_generation, buf); spin_lock(&dev->t10_pr.registration_lock); list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, pr_reg_list) { /* * Check for overflow of 8byte PRI READ_KEYS payload and * next reservation key list descriptor. */ if (off + 8 <= cmd->data_length) { put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); off += 8; } /* * SPC5r17: 6.16.2 READ KEYS service action * The ADDITIONAL LENGTH field indicates the number of bytes in * the Reservation key list. The contents of the ADDITIONAL * LENGTH field are not altered based on the allocation length */ add_len += 8; } spin_unlock(&dev->t10_pr.registration_lock); put_unaligned_be32(add_len, &buf[4]); transport_kunmap_data_sg(cmd); return 0; } /* * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION * * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 */ static sense_reason_t core_scsi3_pri_read_reservation(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct t10_pr_registration *pr_reg; unsigned char *buf; u64 pr_res_key; u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ if (cmd->data_length < 8) { pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" " too small\n", cmd->data_length); return TCM_INVALID_CDB_FIELD; } buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); spin_lock(&dev->dev_reservation_lock); pr_reg = dev->dev_pr_res_holder; if (pr_reg) { /* * Set the hardcoded Additional Length */ put_unaligned_be32(add_len, &buf[4]); if (cmd->data_length < 22) goto err; /* * Set the Reservation key. * * From spc4r17, section 5.7.10: * A persistent reservation holder has its reservation key * returned in the parameter data from a PERSISTENT * RESERVE IN command with READ RESERVATION service action as * follows: * a) For a persistent reservation of the type Write Exclusive * - All Registrants or Exclusive Access All Regitrants, * the reservation key shall be set to zero; or * b) For all other persistent reservation types, the * reservation key shall be set to the registered * reservation key for the I_T nexus that holds the * persistent reservation. */ if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) pr_res_key = 0; else pr_res_key = pr_reg->pr_res_key; put_unaligned_be64(pr_res_key, &buf[8]); /* * Set the SCOPE and TYPE */ buf[21] = (pr_reg->pr_res_scope & 0xf0) | (pr_reg->pr_res_type & 0x0f); } err: spin_unlock(&dev->dev_reservation_lock); transport_kunmap_data_sg(cmd); return 0; } /* * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES * * See spc4r17 section 6.13.4 Table 165 */ static sense_reason_t core_scsi3_pri_report_capabilities(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char *buf; u16 add_len = 8; /* Hardcoded to 8. */ if (cmd->data_length < 6) { pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" " %u too small\n", cmd->data_length); return TCM_INVALID_CDB_FIELD; } buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; put_unaligned_be16(add_len, &buf[0]); buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ /* * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so * set the TMV: Task Mask Valid bit. */ buf[3] |= 0x80; /* * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 */ buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ /* * PTPL_A: Persistence across Target Power Loss Active bit */ if (pr_tmpl->pr_aptpl_active) buf[3] |= 0x01; /* * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 */ buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ transport_kunmap_data_sg(cmd); return 0; } /* * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS * * See spc4r17 section 6.13.5 Table 168 and 169 */ static sense_reason_t core_scsi3_pri_read_full_status(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_node_acl *se_nacl; struct se_portal_group *se_tpg; struct t10_pr_registration *pr_reg, *pr_reg_tmp; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char *buf; u32 add_desc_len = 0, add_len = 0; u32 off = 8; /* off into first Full Status descriptor */ int format_code = 0, pr_res_type = 0, pr_res_scope = 0; int exp_desc_len, desc_len; bool all_reg = false; if (cmd->data_length < 8) { pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" " too small\n", cmd->data_length); return TCM_INVALID_CDB_FIELD; } buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); spin_lock(&dev->dev_reservation_lock); if (dev->dev_pr_res_holder) { struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { all_reg = true; pr_res_type = pr_holder->pr_res_type; pr_res_scope = pr_holder->pr_res_scope; } } spin_unlock(&dev->dev_reservation_lock); spin_lock(&pr_tmpl->registration_lock); list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->registration_list, pr_reg_list) { se_nacl = pr_reg->pr_reg_nacl; se_tpg = pr_reg->pr_reg_nacl->se_tpg; add_desc_len = 0; atomic_inc_mb(&pr_reg->pr_res_holders); spin_unlock(&pr_tmpl->registration_lock); /* * Determine expected length of $FABRIC_MOD specific * TransportID full status descriptor.. */ exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, &format_code); if (exp_desc_len < 0 || exp_desc_len + add_len > cmd->data_length) { pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" " out of buffer: %d\n", cmd->data_length); spin_lock(&pr_tmpl->registration_lock); atomic_dec_mb(&pr_reg->pr_res_holders); break; } /* * Set RESERVATION KEY */ put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); off += 8; off += 4; /* Skip Over Reserved area */ /* * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. */ if (pr_reg->pr_reg_all_tg_pt) buf[off] = 0x02; /* * The struct se_lun pointer will be present for the * reservation holder for PR_HOLDER bit. * * Also, if this registration is the reservation * holder or there is an All Registrants reservation * active, fill in SCOPE and TYPE in the next byte. */ if (pr_reg->pr_res_holder) { buf[off++] |= 0x01; buf[off++] = (pr_reg->pr_res_scope & 0xf0) | (pr_reg->pr_res_type & 0x0f); } else if (all_reg) { buf[off++] |= 0x01; buf[off++] = (pr_res_scope & 0xf0) | (pr_res_type & 0x0f); } else { off += 2; } off += 4; /* Skip over reserved area */ /* * From spc4r17 6.3.15: * * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT * IDENTIFIER field contains the relative port identifier (see * 3.1.120) of the target port that is part of the I_T nexus * described by this full status descriptor. If the ALL_TG_PT * bit is set to one, the contents of the RELATIVE TARGET PORT * IDENTIFIER field are not defined by this standard. */ if (!pr_reg->pr_reg_all_tg_pt) { u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; put_unaligned_be16(sep_rtpi, &buf[off]); off += 2; } else off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ buf[off+4] = se_tpg->proto_id; /* * Now, have the $FABRIC_MOD fill in the transport ID. */ desc_len = target_get_pr_transport_id(se_nacl, pr_reg, &format_code, &buf[off+4]); spin_lock(&pr_tmpl->registration_lock); atomic_dec_mb(&pr_reg->pr_res_holders); if (desc_len < 0) break; /* * Set the ADDITIONAL DESCRIPTOR LENGTH */ put_unaligned_be32(desc_len, &buf[off]); off += 4; /* * Size of full desctipor header minus TransportID * containing $FABRIC_MOD specific) initiator device/port * WWN information. * * See spc4r17 Section 6.13.5 Table 169 */ add_desc_len = (24 + desc_len); off += desc_len; add_len += add_desc_len; } spin_unlock(&pr_tmpl->registration_lock); /* * Set ADDITIONAL_LENGTH */ put_unaligned_be32(add_len, &buf[4]); transport_kunmap_data_sg(cmd); return 0; } sense_reason_t target_scsi3_emulate_pr_in(struct se_cmd *cmd) { sense_reason_t ret; /* * Following spc2r20 5.5.1 Reservations overview: * * If a logical unit has been reserved by any RESERVE command and is * still reserved by any initiator, all PERSISTENT RESERVE IN and all * PERSISTENT RESERVE OUT commands shall conflict regardless of * initiator or service action and shall terminate with a RESERVATION * CONFLICT status. */ if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { pr_err("Received PERSISTENT_RESERVE CDB while legacy" " SPC-2 reservation is held, returning" " RESERVATION_CONFLICT\n"); return TCM_RESERVATION_CONFLICT; } switch (cmd->t_task_cdb[1] & 0x1f) { case PRI_READ_KEYS: ret = core_scsi3_pri_read_keys(cmd); break; case PRI_READ_RESERVATION: ret = core_scsi3_pri_read_reservation(cmd); break; case PRI_REPORT_CAPABILITIES: ret = core_scsi3_pri_report_capabilities(cmd); break; case PRI_READ_FULL_STATUS: ret = core_scsi3_pri_read_full_status(cmd); break; default: pr_err("Unknown PERSISTENT_RESERVE_IN service" " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); return TCM_INVALID_CDB_FIELD; } if (!ret) target_complete_cmd(cmd, GOOD); return ret; } sense_reason_t target_check_reservation(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; sense_reason_t ret; if (!cmd->se_sess) return 0; if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) return 0; if (!dev->dev_attrib.emulate_pr) return 0; if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) return 0; spin_lock(&dev->dev_reservation_lock); if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) ret = target_scsi2_reservation_check(cmd); else ret = target_scsi3_pr_reservation_check(cmd); spin_unlock(&dev->dev_reservation_lock); return ret; }
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