[RFC PATCH 9/19] Target_Core_Mod SPC-4 Persistent Reservations
in [Kernel]
|
Prev: Hello
Next: I2C -bus programming
From: Nicholas A. Bellinger on 11 Sep 2009 22:10 [RFC PATCH 9/19] Target_Core_Mod SPC-4 Persistent Reservations This patch adds support for exhaustive support for SPC-4 compliant persistent reservations for target_core_mod/ConfigFS storage objects. This includes all supported PROUT/PRIN Service Actions and feature bits including SPEC_I_PORT=1 and APTPL=1 Please see the following for more information: http://www.linux-iscsi.org/index.php/Persistent_Reservations Signed-off-by: Nicholas A. Bellinger <nab(a)linux-iscsi.org> diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c new file mode 100644 index 0000000..3681cc6 --- /dev/null +++ b/drivers/target/target_core_pr.c @@ -0,0 +1,3602 @@ +/******************************************************************************* + * Filename: target_core_pr.c + * + * This file contains SPC-3 compliant persistent reservations and + * legacy SPC-2 reservations. + * + * Copyright (c) 2009 Rising Tide, Inc. + * Copyright (c) 2009 Linux-iSCSI.org + * + * Nicholas A. Bellinger <nab(a)kernel.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + ******************************************************************************/ + +#define TARGET_CORE_PR_C + +#include <linux/version.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> + +#include <target/target_core_base.h> +#include <target/target_core_device.h> +#include <target/target_core_hba.h> +#include <target/target_core_tmr.h> +#include <target/target_core_tpg.h> +#include <target/target_core_transport.h> +#include <target/target_core_pr.h> +#include <target/target_core_ua.h> +#include <target/target_core_transport_plugin.h> +#include <target/target_core_fabric_ops.h> +#include <target/target_core_configfs.h> + +#undef TARGET_CORE_PR_C + +/* + * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) + */ +struct pr_transport_id_holder { + int dest_local_nexus; + struct t10_pr_registration_s *dest_pr_reg; + struct se_node_acl_s *dest_node_acl; + struct se_dev_entry_s *dest_se_deve; + struct list_head dest_list; +}; + +static void __core_scsi3_complete_pro_release(se_device_t *, se_node_acl_t *, + t10_pr_registration_t *, int); + +int core_scsi2_reservation_seq_non_holder( + se_cmd_t *cmd, + unsigned char *cdb, + u32 pr_reg_type) +{ + switch (cdb[0]) { + case INQUIRY: + case RELEASE: + case RELEASE_10: + return 0; + default: + return 1; + } + + return 1; +} + +int core_scsi2_reservation_check(se_cmd_t *cmd, u32 *pr_reg_type) +{ + se_device_t *dev = cmd->se_dev; + se_session_t *sess = cmd->se_sess; + int ret; + + if (!(sess)) + return 0; + + spin_lock(&dev->dev_reservation_lock); + if (!dev->dev_reserved_node_acl || !sess) { + spin_unlock(&dev->dev_reservation_lock); + return 0; + } + ret = (dev->dev_reserved_node_acl != sess->se_node_acl) ? -1 : 0; + spin_unlock(&dev->dev_reservation_lock); + + return ret; +} +EXPORT_SYMBOL(core_scsi2_reservation_check); + +int core_scsi2_reservation_release(se_cmd_t *cmd) +{ + se_device_t *dev = cmd->se_dev; + se_session_t *sess = cmd->se_sess; + se_portal_group_t *tpg = sess->se_tpg; + + if (!(sess) || !(tpg)) + return 0; + + spin_lock(&dev->dev_reservation_lock); + if (!dev->dev_reserved_node_acl || !sess) { + spin_unlock(&dev->dev_reservation_lock); + return 0; + } + + if (dev->dev_reserved_node_acl != sess->se_node_acl) { + spin_unlock(&dev->dev_reservation_lock); + return 0; + } + dev->dev_reserved_node_acl = NULL; + printk(KERN_INFO "SCSI-2 Released reservation for %s LUN: %u ->" + " MAPPED LUN: %u for %s\n", TPG_TFO(tpg)->get_fabric_name(), + SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun, + sess->se_node_acl->initiatorname); + spin_unlock(&dev->dev_reservation_lock); + + return 0; +} +EXPORT_SYMBOL(core_scsi2_reservation_release); + +int core_scsi2_reservation_reserve(se_cmd_t *cmd) +{ + se_device_t *dev = cmd->se_dev; + se_session_t *sess = cmd->se_sess; + se_portal_group_t *tpg = sess->se_tpg; + + if ((T_TASK(cmd)->t_task_cdb[1] & 0x01) && + (T_TASK(cmd)->t_task_cdb[1] & 0x02)) { + printk(KERN_ERR "LongIO and Obselete Bits set, returning" + " ILLEGAL_REQUEST\n"); + return -1; + } + + /* + * This is currently the case for target_core_mod passthrough se_cmd_t + * ops + */ + if (!(sess) || !(tpg)) + return 0; + + spin_lock(&dev->dev_reservation_lock); + if (dev->dev_reserved_node_acl && + (dev->dev_reserved_node_acl != sess->se_node_acl)) { + printk(KERN_ERR "SCSI-2 RESERVATION CONFLIFT for %s fabric\n", + TPG_TFO(tpg)->get_fabric_name()); + printk(KERN_ERR "Original reserver LUN: %u %s\n", + SE_LUN(cmd)->unpacked_lun, + dev->dev_reserved_node_acl->initiatorname); + printk(KERN_ERR "Current attempt - LUN: %u -> MAPPED LUN: %u" + " from %s \n", SE_LUN(cmd)->unpacked_lun, + cmd->se_deve->mapped_lun, + sess->se_node_acl->initiatorname); + spin_unlock(&dev->dev_reservation_lock); + return 1; + } + + dev->dev_reserved_node_acl = sess->se_node_acl; + dev->dev_flags |= DF_SPC2_RESERVATIONS; + printk(KERN_INFO "SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" + " for %s\n", TPG_TFO(tpg)->get_fabric_name(), + SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun, + sess->se_node_acl->initiatorname); + spin_unlock(&dev->dev_reservation_lock); + + return 0; +} +EXPORT_SYMBOL(core_scsi2_reservation_reserve); + +/* + * 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( + se_cmd_t *cmd, + unsigned char *cdb, + u32 pr_reg_type) +{ + se_dev_entry_t *se_deve; + se_session_t *se_sess = SE_SESS(cmd); + 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 */ + + se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; + + 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. + */ + if (se_deve->deve_flags & DEF_PR_REGISTERED) + registered_nexus = 1; + break; + case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: + we = 1; + case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: + /* + * Some commands are only allowed for registered I_T Nexuses. + */ + reg_only = 1; + if (se_deve->deve_flags & DEF_PR_REGISTERED) + registered_nexus = 1; + break; + case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: + we = 1; + case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: + /* + * Each registered I_T Nexus is a reservation holder. + */ + all_reg = 1; + if (se_deve->deve_flags & DEF_PR_REGISTERED) + registered_nexus = 1; + break; + default: + return -1; + } + /* + * 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: + printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service" + " action: 0x%02x\n", cdb[1] & 0x1f); + return -1; + } + break; + /* FIXME PR + legacy RELEASE + RESERVE */ + case RELEASE: + case RELEASE_10: + ret = 1; /* Conflict */ + break; + case RESERVE: + case RESERVE_10: + ret = 1; /* Conflict */ + 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: + printk(KERN_ERR "Unknown MI Service Action: 0x%02x\n", + (cdb[1] & 0x1f)); + return -1; + } + break; + case ACCESS_CONTROL_IN: + case ACCESS_CONTROL_OUT: + case INQUIRY: + case LOG_SENSE: + case READ_MEDIA_SERIAL_NUMBER: + case REPORT_LUNS: + case REQUEST_SENSE: + ret = 0; /*/ Allowed CDBs */ + break; + default: + other_cdb = 1; + break; + } + /* + * Case where the CDB is explictly allowed in the above switch + * statement. + */ + if (!(ret) && !(other_cdb)) { +#if 0 + printk(KERN_INFO "Allowing explict CDB: 0x%02x for %s" + " reservation holder\n", cdb[0], + core_scsi3_pr_dump_type(pr_reg_type)); +#endif + return ret; + } + /* + * Check if write exclusive initiator ports *NOT* holding the + * WRITE_EXCLUSIVE_* reservation. + */ + if ((we) && !(registered_nexus)) { + if ((cmd->data_direction == SE_DIRECTION_WRITE) || + (cmd->data_direction == SE_DIRECTION_BIDI)) { + /* + * Conflict for write exclusive + */ + printk(KERN_INFO "%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 0 + if (!(registered_nexus)) { + printk(KERN_INFO "Allowing implict CDB: 0x%02x" + " for %s reservation on unregistered" + " nexus\n", cdb[0], + core_scsi3_pr_dump_type(pr_reg_type)); + } +#endif + 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. + */ +#if 0 + printk(KERN_INFO "Allowing implict CDB: 0x%02x for %s" + " reservation\n", cdb[0], + core_scsi3_pr_dump_type(pr_reg_type)); +#endif + return 0; + } + } + printk(KERN_INFO "%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 u32 core_scsi3_pr_generation(se_device_t *dev) +{ + se_subsystem_dev_t *su_dev = SU_DEV(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 = T10_RES(su_dev)->pr_generation++; + spin_unlock(&dev->dev_reservation_lock); + + return prg; +} + +static int core_scsi3_pr_reservation_check( + se_cmd_t *cmd, + u32 *pr_reg_type) +{ + se_device_t *dev = cmd->se_dev; + se_session_t *sess = cmd->se_sess; + int ret; + + if (!(sess)) + return 0; + + spin_lock(&dev->dev_reservation_lock); + if (!(dev->dev_pr_res_holder)) { + spin_unlock(&dev->dev_reservation_lock); + 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; + ret = (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) ? + -1 : 0; + spin_unlock(&dev->dev_reservation_lock); + + return ret; +} + +static int core_scsi3_legacy_reserve(se_cmd_t *cmd) +{ + /* + * FIXME: See spc4r17 Section 5.7.3 + */ + return core_scsi2_reservation_reserve(cmd); +} + +static int core_scsi3_legacy_release(se_cmd_t *cmd) +{ + /* + * FIXME: See spc4r17 Section 5.7.3 + */ + return core_scsi2_reservation_release(cmd); +} + +static t10_pr_registration_t *__core_scsi3_alloc_registration( + se_device_t *dev, + se_node_acl_t *nacl, + se_dev_entry_t *deve, + u64 sa_res_key, + int all_tg_pt, + int aptpl) +{ + se_subsystem_dev_t *su_dev = SU_DEV(dev); + t10_pr_registration_t *pr_reg; + + pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); + if (!(pr_reg)) { + printk(KERN_ERR "Unable to allocate t10_pr_registration_t\n"); + return NULL; + } + + pr_reg->pr_aptpl_buf = kzalloc(T10_RES(su_dev)->pr_aptpl_buf_len, + GFP_ATOMIC); + if (!(pr_reg->pr_aptpl_buf)) { + printk(KERN_ERR "Unable to allocate pr_reg->pr_aptpl_buf\n"); + kmem_cache_free(t10_pr_reg_cache, pr_reg); + 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); + atomic_set(&pr_reg->pr_res_holders, 0); + pr_reg->pr_reg_nacl = nacl; + pr_reg->pr_reg_deve = deve; + pr_reg->pr_res_mapped_lun = deve->mapped_lun; + pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; + pr_reg->pr_res_key = sa_res_key; + pr_reg->pr_reg_all_tg_pt = all_tg_pt; + pr_reg->pr_reg_aptpl = aptpl; + pr_reg->pr_reg_tg_pt_lun = deve->se_lun; + + return pr_reg; +} + +int core_scsi3_alloc_aptpl_registration( + t10_reservation_template_t *pr_tmpl, + u64 sa_res_key, + unsigned char *i_port, + u32 mapped_lun, + unsigned char *t_port, + u16 tpgt, + u32 target_lun, + int res_holder, + int all_tg_pt, + u8 type) +{ + t10_pr_registration_t *pr_reg; + + if (!(i_port) || !(t_port) || !(sa_res_key)) { + printk(KERN_ERR "Illegal parameters for APTPL registration\n"); + return -1; + } + + pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); + if (!(pr_reg)) { + printk(KERN_ERR "Unable to allocate t10_pr_registration_t\n"); + return -1; + } + pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); + + 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); + 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_reg_tg_pt_lun = NULL; + pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ + pr_reg->pr_res_type = type; + /* + * 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); + printk(KERN_INFO "SPC-3 PR APTPL Successfully added registration%s from" + " metadata\n", (res_holder) ? "+reservation" : ""); + return 0; +} + +static void core_scsi3_aptpl_reserve( + se_device_t *dev, + se_portal_group_t *tpg, + se_node_acl_t *node_acl, + t10_pr_registration_t *pr_reg) +{ + spin_lock(&dev->dev_reservation_lock); + dev->dev_pr_res_holder = pr_reg; + spin_unlock(&dev->dev_reservation_lock); + + printk(KERN_INFO "SPC-3 PR [%s] Service Action: APTPL RESERVE created" + " new reservation holder TYPE: %s ALL_TG_PT: %d\n", + TPG_TFO(tpg)->get_fabric_name(), + core_scsi3_pr_dump_type(pr_reg->pr_res_type), + (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); + printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s\n", + TPG_TFO(tpg)->get_fabric_name(), node_acl->initiatorname); +} + +static void __core_scsi3_add_registration(se_device_t *, se_node_acl_t *, + t10_pr_registration_t *, int, int); + +static int __core_scsi3_check_aptpl_registration( + se_device_t *dev, + se_portal_group_t *tpg, + se_lun_t *lun, + u32 target_lun, + se_node_acl_t *nacl, + se_dev_entry_t *deve) +{ + t10_pr_registration_t *pr_reg, *pr_reg_tmp; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + 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 se_node_acl_t + */ + snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); + snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", + TPG_TFO(tpg)->tpg_get_wwn(tpg)); + tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg); + + 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 == deve->mapped_lun) && + !(strcmp(pr_reg->pr_tport, t_port)) && + (pr_reg->pr_reg_tpgt == tpgt) && + (pr_reg->pr_aptpl_target_lun == target_lun)) { + + pr_reg->pr_reg_nacl = nacl; + pr_reg->pr_reg_deve = deve; + pr_reg->pr_reg_tg_pt_lun = lun; + + 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.. + */ + pr_tmpl->pr_aptpl_active = 1; + + return 1; + } + } + spin_unlock(&pr_tmpl->aptpl_reg_lock); + + return 0; +} + +int core_scsi3_check_aptpl_registration( + se_device_t *dev, + se_portal_group_t *tpg, + se_lun_t *lun, + se_lun_acl_t *lun_acl) +{ + se_subsystem_dev_t *su_dev = SU_DEV(dev); + se_node_acl_t *nacl = lun_acl->se_lun_nacl; + se_dev_entry_t *deve = &nacl->device_list[lun_acl->mapped_lun]; + + if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS) + return 0; + + return __core_scsi3_check_aptpl_registration(dev, tpg, lun, + lun->unpacked_lun, nacl, deve); +} + +/* + * this function can be called with se_device_t->dev_reservation_lock + * when register_move = 1 + */ +static void __core_scsi3_add_registration( + se_device_t *dev, + se_node_acl_t *nacl, + t10_pr_registration_t *pr_reg, + int register_type, + int register_move) +{ + se_subsystem_dev_t *su_dev = SU_DEV(dev); + struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + + /* + * Increment PRgeneration counter for se_device_t 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 se_device_t->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) ? + T10_RES(su_dev)->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); + pr_reg->pr_reg_deve->deve_flags |= DEF_PR_REGISTERED; + + printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER%s Initiator" + " Node: %s\n", tfo->get_fabric_name(), (register_type == 2) ? + "_AND_MOVE" : (register_type == 1) ? + "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname); + printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" + " Port(s)\n", tfo->get_fabric_name(), + (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", + TRANSPORT(dev)->name); + printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" + " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), + pr_reg->pr_res_key, pr_reg->pr_res_generation, + pr_reg->pr_reg_aptpl); + spin_unlock(&pr_tmpl->registration_lock); + + return; +} + +static int core_scsi3_alloc_registration( + se_device_t *dev, + se_node_acl_t *nacl, + se_dev_entry_t *deve, + u64 sa_res_key, + int all_tg_pt, + int aptpl, + int register_type, + int register_move) +{ + t10_pr_registration_t *pr_reg; + + pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, + sa_res_key, all_tg_pt, aptpl); + if (!(pr_reg)) + return -1; + + __core_scsi3_add_registration(dev, nacl, pr_reg, + register_type, register_move); + return 0; +} + +static t10_pr_registration_t *core_scsi3_locate_pr_reg( + se_device_t *dev, + se_node_acl_t *nacl) +{ + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + t10_pr_registration_t *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) { + if (pr_reg->pr_reg_nacl == nacl) { + atomic_inc(&pr_reg->pr_res_holders); + smp_mb__after_atomic_inc(); + spin_unlock(&pr_tmpl->registration_lock); + return pr_reg; + } + } + spin_unlock(&pr_tmpl->registration_lock); + + return NULL; +} + +static void core_scsi3_put_pr_reg(t10_pr_registration_t *pr_reg) +{ + atomic_dec(&pr_reg->pr_res_holders); + smp_mb__after_atomic_dec(); +} + +static int core_scsi3_check_implict_release( + se_device_t *dev, + t10_pr_registration_t *pr_reg) +{ + se_node_acl_t *nacl = pr_reg->pr_reg_nacl; + t10_pr_registration_t *pr_res_holder; + int ret = 0; + + spin_lock(&dev->dev_reservation_lock); + pr_res_holder = dev->dev_pr_res_holder; + if ((pr_res_holder != NULL) && (pr_res_holder == pr_reg)) { + /* + * Perform an implict 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); + ret = 1; +/* #warning FIXME: All Registrants, only release reservation when + last registration is freed. */ + } + spin_unlock(&dev->dev_reservation_lock); + + return ret; +} + +/* + * Called with t10_reservation_template_t->registration_lock held. + */ +static void __core_scsi3_free_registration( + se_device_t *dev, + t10_pr_registration_t *pr_reg, + struct list_head *preempt_and_abort_list, + int dec_holders) +{ + struct target_core_fabric_ops *tfo = + pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + + pr_reg->pr_reg_deve->deve_flags &= ~DEF_PR_REGISTERED; + pr_reg->pr_reg_deve->pr_res_key = 0; + 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); + /* + * 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) { + spin_unlock(&pr_tmpl->registration_lock); + printk("SPC-3 PR [%s] waiting for pr_res_holders\n", + tfo->get_fabric_name()); + msleep(10); + spin_lock(&pr_tmpl->registration_lock); + } + + printk(KERN_INFO "SPC-3 PR [%s] Service Action: UNREGISTER Initiator" + " Node: %s\n", tfo->get_fabric_name(), + pr_reg->pr_reg_nacl->initiatorname); + printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" + " Port(s)\n", tfo->get_fabric_name(), + (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", + TRANSPORT(dev)->name); + printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" + " 0x%08x\n", tfo->get_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; + kfree(pr_reg->pr_aptpl_buf); + 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( + se_device_t *dev, + se_node_acl_t *nacl) +{ + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + t10_pr_registration_t *pr_reg, *pr_reg_tmp, *pr_res_holder; + /* + * 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); + spin_unlock(&dev->dev_reservation_lock); + /* + * Release any registration associated with the se_node_acl_t. + */ + spin_lock(&pr_tmpl->registration_lock); + 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( + se_device_t *dev) +{ + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + t10_pr_registration_t *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) { + se_node_acl_t *pr_res_nacl = pr_res_holder->pr_reg_nacl; + __core_scsi3_complete_pro_release(dev, pr_res_nacl, + pr_res_holder, 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); + kfree(pr_reg->pr_aptpl_buf); + kmem_cache_free(t10_pr_reg_cache, pr_reg); + } + spin_unlock(&pr_tmpl->aptpl_reg_lock); +} + +static int core_scsi3_decode_spec_i_port( + se_cmd_t *cmd, + se_portal_group_t *tpg, + u64 sa_res_key, + int all_tg_pt, + int aptpl) +{ + se_lun_t *lun = SE_LUN(cmd); + se_port_t *port = lun->lun_sep; + se_session_t *se_sess = SE_SESS(cmd); + se_node_acl_t *dest_node_acl; + se_dev_entry_t *dest_se_deve = NULL, *local_se_deve; + t10_pr_registration_t *dest_pr_reg, *local_pr_reg; + struct list_head tid_dest_list; + struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; + unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; + unsigned char *ptr, *i_str = NULL; + char *iport_ptr = NULL, dest_iport[64]; + u32 tpdl, tid_len = 0; + int ret, dest_local_nexus; + + memset(dest_iport, 0, 64); + INIT_LIST_HEAD(&tid_dest_list); + + local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; + /* + * Allocate a struct pr_transport_id_holder and setup the + * local_node_acl and local_se_deve pointers 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)) { + printk(KERN_ERR "Unable to allocate tidh_new\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + INIT_LIST_HEAD(&tidh_new->dest_list); + tidh_new->dest_node_acl = se_sess->se_node_acl; + tidh_new->dest_se_deve = local_se_deve; + + local_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd), + se_sess->se_node_acl, local_se_deve, + sa_res_key, all_tg_pt, aptpl); + if (!(local_pr_reg)) { + kfree(tidh_new); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + tidh_new->dest_pr_reg = local_pr_reg; + /* + * The local I_T nexus does not hold any configfs dependances, + * so we set tid_h->dest_local_nexus=1 to prevent the + * configfs_undepend_item() calls in the tid_dest_list loops below. + */ + tidh_new->dest_local_nexus = 1; + list_add_tail(&tidh_new->dest_list, &tid_dest_list); + /* + * 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 = (buf[24] & 0xff) << 24; + tpdl |= (buf[25] & 0xff) << 16; + tpdl |= (buf[26] & 0xff) << 8; + tpdl |= buf[27] & 0xff; + + if ((tpdl + 28) != cmd->data_length) { + printk(KERN_ERR "SPC-3 PR: Illegal tpdl: %u + 28 byte header" + " does not equal CDB data_length: %u\n", tpdl, + cmd->data_length); + return PYX_TRANSPORT_INVALID_PARAMETER_LIST; + } + /* + * struct target_fabric_core_ops->tpg_parse_pr_out_transport_id() + * must exist to parse the fabric dependent transport IDs. + */ + if (TPG_TFO(tpg)->tpg_parse_pr_out_transport_id == NULL) { + printk(KERN_ERR "SPC-3 SPEC_I_PT: Fabric does not" + " containing a valid tpg_parse_pr_out_transport_id" + " function pointer\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + /* + * 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) { + i_str = TPG_TFO(tpg)->tpg_parse_pr_out_transport_id( + (const char *)ptr, &tid_len, + &iport_ptr); + if (!(i_str)) { + printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Unable to locate" + " i_str from Transport ID\n"); + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } +#if 0 + printk("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" + " tid_len: %d for %s + %s\n", + TPG_TFO(tpg)->get_fabric_name(), cmd->data_length, + tpdl, tid_len, i_str, iport_ptr); +#endif + if (tid_len > tpdl) { + printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Illegal tid_len:" + " %u for Transport ID: %s\n", tid_len, ptr); + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } + /* + * Locate the desination initiator ACL to be registered. + */ + dest_node_acl = core_tpg_get_initiator_node_acl(tpg, i_str); + if (!(dest_node_acl)) { + printk(KERN_ERR "Unable to locate %s dest_node_acl" + " for TransportID: %s %s\n", + TPG_TFO(tpg)->get_fabric_name(), + i_str, (iport_ptr != NULL) ? iport_ptr : ""); + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } + + ret = configfs_depend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + if (ret != 0) { + printk(KERN_ERR "configfs_depend_item() failed for" + " dest_node_acl->acl_group\n"); + ret = PYX_TRANSPORT_LU_COMM_FAILURE; + goto out; + } + /* + * If the a SCSI Initiator Port identifier is presented, then + * the SCSI nexus must be present and matching the provided + * TransportID. The active se_session_t pointer is available + * from dest_node_acl->nacl_sess; + */ + if (iport_ptr != NULL) { + spin_lock(&dest_node_acl->nacl_sess_lock); + if (dest_node_acl->nacl_sess == NULL) { + printk(KERN_ERR "SPC-3 SPEC_I_PT: iport_ptr: %s" + " presented in Transport ID, but no " + " active nexus exists for %s Fabric" + " Node: %s\n", iport_ptr, + TPG_TFO(tpg)->get_fabric_name(), + dest_node_acl->initiatorname); + spin_unlock(&dest_node_acl->nacl_sess_lock); + + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } + TPG_TFO(tpg)->sess_get_initiator_wwn( + dest_node_acl->nacl_sess, + &dest_iport[0], 64); + spin_unlock(&dest_node_acl->nacl_sess_lock); + + if (strcmp(dest_iport, iport_ptr)) { + printk(KERN_ERR "SPC-3 SPEC_I_PT: dest_iport:" + " %s and iport_ptr: %s do not match!\n", + dest_iport, iport_ptr); + + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } + } + /* + * Locate the desintation se_dev_entry_t pointer for matching + * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus + * Target Port. + * + * Note that core_get_se_deve_from_rtpi() will call + * configfs_item_depend() on + * deve->se_lun_acl->se_lun_group.cg_item. + */ + dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, + port->sep_rtpi); + if (!(dest_se_deve)) { + printk(KERN_ERR "Unable to locate %s dest_se_deve" + " from local RTPI: %hu\n", + TPG_TFO(tpg)->get_fabric_name(), + port->sep_rtpi); + + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } +#if 0 + printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node: %s" + " dest_se_deve mapped_lun: %u\n", + TPG_TFO(tpg)->get_fabric_name(), + dest_node_acl->initiatorname, dest_se_deve->mapped_lun); +#endif + /* + * Skip any TransportIDs that already have a registration for + * this target port. + */ + if (dest_se_deve->deve_flags & DEF_PR_REGISTERED) { + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_se_deve->se_lun_acl->se_lun_group.cg_item); + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + ptr += tid_len; + tpdl -= tid_len; + tid_len = 0; + } + /* + * 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)) { + printk(KERN_ERR "Unable to allocate tidh_new\n"); + ret = PYX_TRANSPORT_LU_COMM_FAILURE; + goto out; + } + INIT_LIST_HEAD(&tidh_new->dest_list); + 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_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd), + dest_node_acl, dest_se_deve, + sa_res_key, all_tg_pt, aptpl); + if (!(dest_pr_reg)) { + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_se_deve->se_lun_acl->se_lun_group.cg_item); + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; + goto out; + } + 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; + + } + /* + * 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_node_acl = tidh->dest_node_acl; + dest_se_deve = tidh->dest_se_deve; + dest_pr_reg = tidh->dest_pr_reg; + dest_local_nexus = tidh->dest_local_nexus; + + list_del(&tidh->dest_list); + kfree(tidh); + + __core_scsi3_add_registration(SE_DEV(cmd), dest_node_acl, + dest_pr_reg, 0, 0); + + printk(KERN_INFO "SPC-3 PR [%s] SPEC_I_PT: Successfully" + " registered Transport ID for Node: %s Mapped LUN:" + " %u\n", TPG_TFO(tpg)->get_fabric_name(), + dest_node_acl->initiatorname, + dest_se_deve->mapped_lun); + + if (dest_local_nexus) + continue; + + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_se_deve->se_lun_acl->se_lun_group.cg_item); + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + } + + return 0; +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) { + dest_node_acl = tidh->dest_node_acl; + dest_se_deve = tidh->dest_se_deve; + dest_pr_reg = tidh->dest_pr_reg; + dest_local_nexus = tidh->dest_local_nexus; + + list_del(&tidh->dest_list); + kfree(tidh); + + kfree(dest_pr_reg->pr_aptpl_buf); + kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); + + if (dest_local_nexus) + continue; + + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_se_deve->se_lun_acl->se_lun_group.cg_item); + configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, + &dest_node_acl->acl_group.cg_item); + } + return ret; +} + +/* + * Called with se_device_t->dev_reservation_lock held + */ +static int __core_scsi3_update_aptpl_buf( + se_device_t *dev, + unsigned char *buf, + u32 pr_aptpl_buf_len, + int clear_aptpl_metadata) +{ + se_lun_t *lun; + se_portal_group_t *tpg; + se_subsystem_dev_t *su_dev = SU_DEV(dev); + t10_pr_registration_t *pr_reg; + unsigned char tmp[1024]; + ssize_t len = 0; + int reg_count = 0; + + memset(buf, 0, pr_aptpl_buf_len); + /* + * Called to clear metadata once APTPL has been deactivated. + */ + if (clear_aptpl_metadata) { + snprintf(buf, pr_aptpl_buf_len, + "No Registrations or Reservations\n"); + return 0; + } + /* + * Walk the registration list.. + */ + spin_lock(&T10_RES(su_dev)->registration_lock); + list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list, + pr_reg_list) { + + memset(tmp, 0, 1024); + tpg = pr_reg->pr_reg_nacl->se_tpg; + lun = pr_reg->pr_reg_tg_pt_lun; + /* + * Include special metadata if the pr_reg matches the + * reservation holder. + */ + if (dev->dev_pr_res_holder == pr_reg) { + snprintf(tmp, 1024, "PR_REG_START: %d" + "\ninitiator_fabric=%s\n" + "initiator_node=%s\n" + "sa_res_key=%llu\n" + "res_holder=1\nres_type=%02x\n" + "res_scope=%02x\nres_all_tg_pt=%d\n" + "mapped_lun=%u\n", reg_count, + TPG_TFO(tpg)->get_fabric_name(), + pr_reg->pr_reg_nacl->initiatorname, + 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, 1024, "PR_REG_START: %d\n" + "initiator_fabric=%s\ninitiator_node=%s\n" + "sa_res_key=%llu\nres_holder=0\n" + "res_all_tg_pt=%d\nmapped_lun=%u\n", + reg_count, TPG_TFO(tpg)->get_fabric_name(), + pr_reg->pr_reg_nacl->initiatorname, + 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)) { + printk(KERN_ERR "Unable to update renaming" + " APTPL metadata\n"); + spin_unlock(&T10_RES(su_dev)->registration_lock); + return -1; + } + len += sprintf(buf+len, "%s", tmp); + + /* + * Include information about the associated SCSI target port. + */ + snprintf(tmp, 1024, "target_fabric=%s\ntarget_node=%s\n" + "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" + " %d\n", TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_wwn(tpg), + TPG_TFO(tpg)->tpg_get_tag(tpg), + lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); + + if ((len + strlen(tmp) > pr_aptpl_buf_len)) { + printk(KERN_ERR "Unable to update renaming" + " APTPL metadata\n"); + spin_unlock(&T10_RES(su_dev)->registration_lock); + return -1; + } + len += sprintf(buf+len, "%s", tmp); + reg_count++; + } + spin_unlock(&T10_RES(su_dev)->registration_lock); + + if (!(reg_count)) + len += sprintf(buf+len, "No Registrations or Reservations"); + + return 0; +} + +static int core_scsi3_update_aptpl_buf( + se_device_t *dev, + unsigned char *buf, + u32 pr_aptpl_buf_len, + int clear_aptpl_metadata) +{ + int ret; + + spin_lock(&dev->dev_reservation_lock); + ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, + clear_aptpl_metadata); + spin_unlock(&dev->dev_reservation_lock); + + return ret; +} + +/* + * Called with se_device_t->aptpl_file_mutex held + */ +static int __core_scsi3_write_aptpl_to_file( + se_device_t *dev, + unsigned char *buf, + u32 pr_aptpl_buf_len) +{ + t10_wwn_t *wwn = &SU_DEV(dev)->t10_wwn; + struct file *file; + struct iovec iov[1]; + mm_segment_t old_fs; + int flags = O_RDWR | O_CREAT | O_TRUNC; + char path[512]; + int ret; + + memset(iov, 0, sizeof(struct iovec)); + memset(path, 0, 512); + + if (strlen(&wwn->unit_serial[0]) > 512) { + printk(KERN_ERR "WWN value for se_device_t does not fit" + " into path buffer\n"); + return -1; + } + + snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); + file = filp_open(path, flags, 0600); + if (IS_ERR(file) || !file || !file->f_dentry) { + printk(KERN_ERR "filp_open(%s) for APTPL metadata" + " failed\n", path); + return -1; + } + + iov[0].iov_base = &buf[0]; + if (!(pr_aptpl_buf_len)) + iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ + else + iov[0].iov_len = pr_aptpl_buf_len; + + old_fs = get_fs(); + set_fs(get_ds()); + ret = vfs_writev(file, &iov[0], 1, &file->f_pos); + set_fs(old_fs); + + if (ret < 0) { + printk("Error writing APTPL metadata file: %s\n", path); + filp_close(file, NULL); + return -1; + } + filp_close(file, NULL); + + return 0; +} + +static int core_scsi3_update_and_write_aptpl( + se_device_t *dev, + unsigned char *in_buf, + u32 in_pr_aptpl_buf_len) +{ + unsigned char null_buf[64], *buf; + u32 pr_aptpl_buf_len; + int ret, clear_aptpl_metadata = 0; + /* + * Can be called with a NULL pointer from PROUT service action CLEAR + */ + if (!(in_buf)) { + memset(null_buf, 0, 64); + buf = &null_buf[0]; + /* + * This will clear the APTPL metadata to: + * "No Registrations or Reservations" status + */ + pr_aptpl_buf_len = 64; + clear_aptpl_metadata = 1; + } else { + buf = in_buf; + pr_aptpl_buf_len = in_pr_aptpl_buf_len; + } + + ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, + clear_aptpl_metadata); + if (ret != 0) + return -1; + /* + * __core_scsi3_write_aptpl_to_file() will call strlen() + * on the passed buf to determine pr_aptpl_buf_len. + */ + ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); + if (ret != 0) + return -1; + + return ret; +} + +static int core_scsi3_emulate_pro_register( + se_cmd_t *cmd, + u64 res_key, + u64 sa_res_key, + int aptpl, + int all_tg_pt, + int spec_i_pt, + int ignore_key) +{ + se_session_t *se_sess = SE_SESS(cmd); + se_device_t *dev = SE_DEV(cmd); + se_dev_entry_t *se_deve; + se_lun_t *se_lun = SE_LUN(cmd); + se_portal_group_t *se_tpg; + t10_pr_registration_t *pr_reg, *pr_reg_p; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + /* Used for APTPL metadata w/ UNREGISTER */ + unsigned char *pr_aptpl_buf = NULL; + int pr_holder = 0, ret = 0, type; + + if (!(se_sess) || !(se_lun)) { + printk(KERN_ERR "SPC-3 PR: se_sess || se_lun_t is NULL!\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + se_tpg = se_sess->se_tpg; + se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; + /* + * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 + */ + if (!(se_deve->deve_flags & DEF_PR_REGISTERED)) { + if (res_key) { + printk(KERN_WARNING "SPC-3 PR: Reservation Key non-zero" + " for SA REGISTER, returning CONFLICT\n"); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + /* + * Do nothing but return GOOD status. + */ + if (!(sa_res_key)) + return PYX_TRANSPORT_SENT_TO_TRANSPORT; + + 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. + */ + ret = core_scsi3_alloc_registration(SE_DEV(cmd), + se_sess->se_node_acl, se_deve, + sa_res_key, all_tg_pt, aptpl, + ignore_key, 0); + if (ret != 0) { + printk(KERN_ERR "Unable to allocate" + " t10_pr_registration_t\n"); + return PYX_TRANSPORT_INVALID_PARAMETER_LIST; + } + } 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, + sa_res_key, all_tg_pt, aptpl); + if (ret != 0) + return ret; + } + /* + * Nothing left to do for the APTPL=0 case. + */ + if (!(aptpl)) { + pr_tmpl->pr_aptpl_active = 0; + core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0); + printk("SPC-3 PR: Set APTPL Bit Deactivated for" + " REGISTER\n"); + return 0; + } + /* + * Locate the newly allocated local I_T Nexus *pr_reg, and + * update the APTPL metadata information using its + * preallocated *pr_reg->pr_aptpl_buf. + */ + pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), + se_sess->se_node_acl); + + ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), + &pr_reg->pr_aptpl_buf[0], + pr_tmpl->pr_aptpl_buf_len); + if (!(ret)) { + pr_tmpl->pr_aptpl_active = 1; + printk("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); + } + + core_scsi3_put_pr_reg(pr_reg); + return ret; + } else { + /* + * Locate the existing *pr_reg via se_node_acl_t pointers + */ + pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), + se_sess->se_node_acl); + if (!(pr_reg)) { + printk(KERN_ERR "SPC-3 PR: Unable to locate" + " PR_REGISTERED *pr_reg for REGISTER\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + type = pr_reg->pr_res_type; + + if (!(ignore_key)) { + if (res_key != pr_reg->pr_res_key) { + printk(KERN_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); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + } + if (spec_i_pt) { + printk(KERN_ERR "SPC-3 PR UNREGISTER: SPEC_I_PT" + " set while sa_res_key=0\n"); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_INVALID_PARAMETER_LIST; + } + /* + * Allocate APTPL metadata buffer used for UNREGISTER ops + */ + if (aptpl) { + pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, + GFP_KERNEL); + if (!(pr_aptpl_buf)) { + printk(KERN_ERR "Unable to allocate" + " pr_aptpl_buf\n"); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + } + /* + * sa_res_key=0 Unregister Reservation Key for registered I_T + * Nexus sa_res_key=1 Change Reservation Key for registered I_T + * Nexus. + */ + if (!(sa_res_key)) { + pr_holder = core_scsi3_check_implict_release( + SE_DEV(cmd), pr_reg); + + spin_lock(&pr_tmpl->registration_lock); + /* + * Release the calling I_T Nexus registration now.. + */ + __core_scsi3_free_registration(SE_DEV(cmd), pr_reg, + NULL, 1); + /* + * 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) { + + core_scsi3_ua_allocate( + pr_reg_p->pr_reg_nacl, + pr_reg_p->pr_res_mapped_lun, + 0x2A, + ASCQ_2AH_RESERVATIONS_RELEASED); + } + } + spin_unlock(&pr_tmpl->registration_lock); + + if (!(aptpl)) { + pr_tmpl->pr_aptpl_active = 0; + core_scsi3_update_and_write_aptpl(dev, NULL, 0); + printk("SPC-3 PR: Set APTPL Bit Deactivated" + " for UNREGISTER\n"); + return 0; + } + + ret = core_scsi3_update_and_write_aptpl(dev, + &pr_aptpl_buf[0], + pr_tmpl->pr_aptpl_buf_len); + if (!(ret)) { + pr_tmpl->pr_aptpl_active = 1; + printk("SPC-3 PR: Set APTPL Bit Activated" + " for UNREGISTER\n"); + } + + kfree(pr_aptpl_buf); + return ret; + } else { + /* + * Increment PRgeneration counter for se_device_t" + * upon a successful REGISTER, see spc4r17 section 6.3.2 + * READ_KEYS service action. + */ + pr_reg->pr_res_generation = core_scsi3_pr_generation( + SE_DEV(cmd)); + pr_reg->pr_res_key = sa_res_key; + printk("SPC-3 PR [%s] REGISTER%s: Changed Reservation" + " Key for %s to: 0x%016Lx PRgeneration:" + " 0x%08x\n", CMD_TFO(cmd)->get_fabric_name(), + (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", + pr_reg->pr_reg_nacl->initiatorname, + pr_reg->pr_res_key, pr_reg->pr_res_generation); + + core_scsi3_put_pr_reg(pr_reg); + } + } + return 0; +} + +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 int core_scsi3_pro_reserve( + se_cmd_t *cmd, + se_device_t *dev, + int type, + int scope, + u64 res_key) +{ + se_session_t *se_sess = SE_SESS(cmd); + se_dev_entry_t *se_deve; + se_lun_t *se_lun = SE_LUN(cmd); + se_portal_group_t *se_tpg; + t10_pr_registration_t *pr_reg, *pr_res_holder; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + int ret; + + if (!(se_sess) || !(se_lun)) { + printk(KERN_ERR "SPC-3 PR: se_sess || se_lun_t is NULL!\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + se_tpg = se_sess->se_tpg; + se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; + /* + * Locate the existing *pr_reg via se_node_acl_t pointers + */ + pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl); + if (!(pr_reg)) { + printk(KERN_ERR "SPC-3 PR: Unable to locate" + " PR_REGISTERED *pr_reg for RESERVE\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + /* + * For a given ALL_TG_PT=0 PR registration, a recevied PR reserve must + * be on the same matching se_portal_group_t + se_lun_t. + */ + if (!(pr_reg->pr_reg_all_tg_pt) && + (pr_reg->pr_reg_tg_pt_lun != se_lun)) { + printk(KERN_ERR "SPC-3 PR: Unable to handle RESERVE because" + " ALL_TG_PT=0 and RESERVE was not received on same" + " target port as REGISTER\n"); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + /* + * 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) { + printk(KERN_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); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + /* + * 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) { + printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_INVALID_PARAMETER_LIST; + } + /* + * See if we have an existing PR reservation holder pointer at + * se_device_t->dev_pr_res_holder in the form t10_pr_registration_t + * *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 (pr_res_holder != pr_reg) { + se_node_acl_t *pr_res_nacl = pr_res_holder->pr_reg_nacl; + printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from" + " [%s]: %s while reservation already held by" + " [%s]: %s, returning RESERVATION_CONFLICT\n", + CMD_TFO(cmd)->get_fabric_name(), + se_sess->se_node_acl->initiatorname, + TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(), + pr_res_holder->pr_reg_nacl->initiatorname); + + spin_unlock(&dev->dev_reservation_lock); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + /* + * 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)) { + se_node_acl_t *pr_res_nacl = pr_res_holder->pr_reg_nacl; + printk(KERN_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_TFO(cmd)->get_fabric_name(), + se_sess->se_node_acl->initiatorname, + TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(), + pr_res_holder->pr_reg_nacl->initiatorname); + + spin_unlock(&dev->dev_reservation_lock); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_RESERVATION_CONFLICT; + } + /* + * 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); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_SENT_TO_TRANSPORT; + } + /* + * 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; + + printk(KERN_INFO "SPC-3 PR [%s] Service Action: RESERVE created new" + " reservation holder TYPE: %s ALL_TG_PT: %d\n", + CMD_TFO(cmd)->get_fabric_name(), core_scsi3_pr_dump_type(type), + (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); + printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s\n", + CMD_TFO(cmd)->get_fabric_name(), + se_sess->se_node_acl->initiatorname); + spin_unlock(&dev->dev_reservation_lock); + + if (pr_tmpl->pr_aptpl_active) { + ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), + &pr_reg->pr_aptpl_buf[0], + pr_tmpl->pr_aptpl_buf_len); + if (!(ret)) + printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata" + " for RESERVE\n"); + } + + core_scsi3_put_pr_reg(pr_reg); + return 0; +} + +static int core_scsi3_emulate_pro_reserve( + se_cmd_t *cmd, + int type, + int scope, + u64 res_key) +{ + se_device_t *dev = cmd->se_dev; + int ret = 0; + + 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: + ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); + break; + default: + printk(KERN_ERR "SPC-3 PR: Unknown Service Action RESERVE Type:" + " 0x%02x\n", type); + return PYX_TRANSPORT_INVALID_CDB_FIELD; + } + + return ret; +} + +/* + * Called with se_device_t->dev_reservation_lock held. + */ +static void __core_scsi3_complete_pro_release( + se_device_t *dev, + se_node_acl_t *se_nacl, + t10_pr_registration_t *pr_reg, + int explict) +{ + struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; + /* + * Go ahead and release the current PR reservation holder. + */ + dev->dev_pr_res_holder = NULL; + + printk(KERN_INFO "SPC-3 PR [%s] Service Action: %s RELEASE cleared" + " reservation holder TYPE: %s ALL_TG_PT: %d\n", + tfo->get_fabric_name(), (explict) ? "explict" : "implict", + core_scsi3_pr_dump_type(pr_reg->pr_res_type), + (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); + printk(KERN_INFO "SPC-3 PR [%s] RELEASE Node: %s\n", + tfo->get_fabric_name(), + se_nacl->initiatorname); + /* + * 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 int core_scsi3_emulate_pro_release( + se_cmd_t *cmd, + int type, + int scope, + u64 res_key) +{ + se_device_t *dev = cmd->se_dev; + se_session_t *se_sess = SE_SESS(cmd); + se_lun_t *se_lun = SE_LUN(cmd); + t10_pr_registration_t *pr_reg, *pr_reg_p, *pr_res_holder; + t10_reservation_template_t *pr_tmpl = &SU_DEV(dev)->t10_reservation; + int ret; + + if (!(se_sess) || !(se_lun)) { + printk(KERN_ERR "SPC-3 PR: se_sess || se_lun_t is NULL!\n"); + return PYX_TRANSPORT_LU_COMM_FAILURE; + } + /* + * Locate the existing *pr_reg via se_node_acl_t pointers + */ + pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl); + if (!(pr_reg)) { + printk(KERN_ERR "SPC-3 PR: Unable to locate" + " PR_REGISTERED *pr_reg for RELEASE\n"); + return PYX_TRANSPORT_LU_COMM_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); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_SENT_TO_TRANSPORT; + } + if (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); + core_scsi3_put_pr_reg(pr_reg); + return PYX_TRANSPORT_SENT_TO_TRANSPORT; + } + /* + * 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) { + printk(KERN_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); + core_s
|
Pages: 1 Prev: Hello Next: I2C -bus programming |