This adds a new SPC-3 ALUA hardware handler for multipathing. Signed-off-by: Hannes Reinecke <hare@xxxxxxx> --- drivers/md/Kconfig | 7 + drivers/md/Makefile | 2 + drivers/md/dm-mpath-alua.c | 681 ++++++++++++++++++++++++++++++++++++++++++++ include/scsi/scsi.h | 3 + 4 files changed, 693 insertions(+), 0 deletions(-) create mode 100644 drivers/md/dm-mpath-alua.c diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 9b6fbf0..2044fb4 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -273,6 +273,13 @@ config DM_MULTIPATH_HP ---help--- Multipath support for HP MSA (Active/Passive) series hardware. +config DM_MULTIPATH_ALUA + tristate "SPC-3 ALUA multipath support (EXPERIMENTAL)" + depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL + ---help--- + Multipath support for SPC-3 Asymmetric Logical Unit + Access (ALUA). + config DM_DELAY tristate "I/O delaying target (EXPERIMENTAL)" depends on BLK_DEV_DM && EXPERIMENTAL diff --git a/drivers/md/Makefile b/drivers/md/Makefile index d9aa7ed..6b8fd78 100644 --- a/drivers/md/Makefile +++ b/drivers/md/Makefile @@ -8,6 +8,7 @@ dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o dm-snapshot-objs := dm-snap.o dm-exception-store.o dm-mirror-objs := dm-log.o dm-raid1.o dm-rdac-objs := dm-mpath-rdac.o +dm-alua-objs := dm-mpath-alua.o dm-hp-sw-objs := dm-mpath-hp-sw.o md-mod-objs := md.o bitmap.o raid456-objs := raid5.o raid6algos.o raid6recov.o raid6tables.o \ @@ -38,6 +39,7 @@ obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o obj-$(CONFIG_DM_MULTIPATH_EMC) += dm-emc.o obj-$(CONFIG_DM_MULTIPATH_HP) += dm-hp-sw.o obj-$(CONFIG_DM_MULTIPATH_RDAC) += dm-rdac.o +obj-$(CONFIG_DM_MULTIPATH_ALUA) += dm-alua.o obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o obj-$(CONFIG_DM_MIRROR) += dm-mirror.o obj-$(CONFIG_DM_ZERO) += dm-zero.o diff --git a/drivers/md/dm-mpath-alua.c b/drivers/md/dm-mpath-alua.c new file mode 100644 index 0000000..cc954f2 --- /dev/null +++ b/drivers/md/dm-mpath-alua.c @@ -0,0 +1,681 @@ +/* + * Generic SCSI-3 ALUA DM HW handler + * + * Copyright (C) 2007 Hannes Reinecke, SUSE Linux Products GmbH. + * All rights reserved. + * + * 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. + * + */ +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_eh.h> + +#define DM_MSG_PREFIX "multipath alua" + +#include "dm.h" +#include "dm-hw-handler.h" + +#define DM_ALUA_HWH_NAME "alua" +#define DM_ALUA_HWH_VER "1.0" + +#define TPGS_STATE_OPTIMIZED 0x0 +#define TPGS_STATE_NONOPTIMIZED 0x1 +#define TPGS_STATE_STANDBY 0x2 +#define TPGS_STATE_UNAVAILABLE 0x3 +#define TPGS_STATE_OFFLINE 0xe +#define TPGS_STATE_TRANSITIONING 0xf + +#define TPGS_SUPPORT_NONE 0x00 +#define TPGS_SUPPORT_OPTIMIZED 0x01 +#define TPGS_SUPPORT_NONOPTIMIZED 0x02 +#define TPGS_SUPPORT_STANDBY 0x04 +#define TPGS_SUPPORT_UNAVAILABLE 0x08 +#define TPGS_SUPPORT_OFFLINE 0x40 +#define TPGS_SUPPORT_TRANSITION 0x80 + +#define TPGS_MODE_UNINITIALIZED -1 +#define TPGS_MODE_NONE 0x0 +#define TPGS_MODE_IMPLICIT 0x1 +#define TPGS_MODE_EXPLICIT 0x2 + +#define ALUA_INQUIRY_SIZE 36 +#define ALUA_FAILOVER_TIMEOUT (60 * HZ) + +struct alua_handler { + struct dm_path *path; + int group_id; + int rel_port; + int tpgs; + int state; + int retry; + unsigned char inq[ALUA_INQUIRY_SIZE]; + unsigned char *buff; + int bufflen; + unsigned char sense[SCSI_SENSE_BUFFERSIZE]; +}; + +#define ALUA_POLICY_SWITCH_CURRENT 0 +#define ALUA_POLICY_SWITCH_ALL 1 + +static inline int had_failures(struct request *req, int error) +{ + return (error || host_byte(req->errors) != DID_OK || + msg_byte(req->errors) != COMMAND_COMPLETE); +} + +static int realloc_buffer(struct alua_handler *h, unsigned len) +{ + if (h->buff && h->buff != h->inq) + kfree(h->buff); + + h->buff = kzalloc(len, GFP_KERNEL); + if (!h->buff) { + DMINFO("%s: kmalloc buffer failed",__FUNCTION__); + h->buff = h->inq; + h->bufflen = ALUA_INQUIRY_SIZE; + return 1; + } + h->bufflen = len; + return 0; +} + +static struct request *prepare_req(struct hw_handler *hwh, + void *buffer, unsigned buflen, int rw) +{ + struct alua_handler *h = hwh->context; + struct request *rq; + struct request_queue *q = bdev_get_queue(h->path->dev->bdev); + + if (!q) { + DMWARN("%s: no queue", __FUNCTION__); + return NULL; + } + + rq = blk_get_request(q, rw, GFP_KERNEL); + + if (!rq) { + DMINFO("%s: blk_get_request failed", __FUNCTION__); + return NULL; + } + + if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) { + blk_put_request(rq); + DMINFO("%s: blk_rq_map_kern failed", __FUNCTION__); + return NULL; + } + + memset(&rq->cmd, 0, BLK_MAX_CDB); + rq->sense = h->sense; + memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); + rq->sense_len = 0; + + rq->timeout = ALUA_FAILOVER_TIMEOUT; + rq->cmd_type = REQ_TYPE_BLOCK_PC; + rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE | REQ_QUIET; + rq->end_io_data = hwh; + + return rq; +} + +/* + * Standard INQUIRY endio handler + * + * Just extract the TPGS setting to find out if ALUA + * is supported. + */ +static void std_inquiry_endio(struct request *req, int error) +{ + struct hw_handler *hwh = req->end_io_data; + struct alua_handler *h = hwh->context; + + if (had_failures(req, error)) { + DMWARN("%s: std inquiry error %x %x", + h->path->dev->name, req->errors, error); + dm_pg_init_complete(h->path, MP_FAIL_PATH); + goto done; + } + + /* Check TPGS setting */ + h->tpgs = (h->inq[5] >> 4) & 0x3; + switch (h->tpgs) { + case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT: + DMWARN("%s: supports implicit and explicit TPGS", + h->path->dev->name); + break; + case TPGS_MODE_EXPLICIT: + DMWARN("%s: supports explicit TPGS", + h->path->dev->name); + break; + case TPGS_MODE_IMPLICIT: + DMWARN("%s: supports implicit TPGS", + h->path->dev->name); + break; + default: + DMWARN("%s: TPGS not supported (%x)", + h->path->dev->name, h->inq[5] >> 4); + h->tpgs = TPGS_MODE_NONE; + break; + } + + if (h->tpgs == TPGS_MODE_NONE) { + /* + * ALUA not supported + */ + dm_pg_init_complete(h->path, 0); + } else + dm_enqueue_hw_workq(hwh); + + done: + __blk_put_request(req->q, req); +} + +/* + * Issue a standard INQUIRY command + */ +static void submit_std_inquiry(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + struct request *rq; + + if (h->buff && h->buff != h->inq) { + DMWARN("%s: std inq free buf", h->path->dev->name); + kfree(h->buff); + } + + h->buff = h->inq; + h->bufflen = ALUA_INQUIRY_SIZE; + + rq = prepare_req(hwh, h->inq, ALUA_INQUIRY_SIZE, READ); + if (!rq) { + dm_pg_init_complete(h->path, MP_FAIL_PATH); + return; + } + + /* Prepare the command. */ + rq->cmd[0] = INQUIRY; + rq->cmd[1] = 0; + rq->cmd[2] = 0; + rq->cmd[3] = 0; + rq->cmd[4] = ALUA_INQUIRY_SIZE; + rq->cmd_len = COMMAND_SIZE(INQUIRY); + + DMINFO("%s: submit std inq %x %x %x %x %x %x", + h->path->dev->name, rq->cmd[0], rq->cmd[1], + rq->cmd[2], rq->cmd[3], rq->cmd[4], rq->cmd[5]); + + blk_execute_rq_nowait(rq->q, NULL, rq, 1, std_inquiry_endio); +} + +/* + * INQUIRY vpd page 0x83 endio handler + * + * Extract the relative target port and the target port group + * descriptor from the list of identificators. + */ +static void vpd_inquiry_endio(struct request *req, int error) +{ + struct hw_handler *hwh = req->end_io_data; + struct alua_handler *h = hwh->context; + int len; + unsigned char *d; + + if (had_failures(req, error)) { + DMWARN("%s: vpd inquiry error %x %x", + h->path->dev->name, req->errors, error); + dm_pg_init_complete(h->path, MP_FAIL_PATH); + goto out; + } + + /* Check if vpd page exceeds initial buffer */ + len = (h->buff[2] << 8) + h->buff[3] + 4; + if (len > h->bufflen) { + /* Resubmit with the correct length */ + if (realloc_buffer(h, len)) { + DMINFO("%s: kmalloc buffer failed",__FUNCTION__); + /* Temporary failure, bypass */ + dm_pg_init_complete(h->path, MP_BYPASS_PG); + } else { + dm_enqueue_hw_workq(hwh); + } + goto out; + } + + /* + * Now look for the correct descriptor. + */ + d = h->buff + 4; + while (d < h->buff + len) { + switch (d[1] & 0xf) { + case 0x4: + /* Relative target port */ + h->rel_port = (d[6] << 8) + d[7]; + break; + case 0x5: + /* Target port group */ + h->group_id = (d[6] << 8) + d[7]; + break; + default: + break; + } + d += d[3] + 4; + } + + if (h->group_id == -1) { + /* + * Internal error; TPGS supported but required + * VPD identification descriptors not present. + * Disable ALUA support + */ + DMWARN("%s: No target port descriptors in VPD page 0x83\n", + h->path->dev->name); + h->state = TPGS_STATE_OPTIMIZED; + h->tpgs = TPGS_MODE_NONE; + dm_pg_init_complete(h->path, 0); + } else { + DMWARN("%s: port group %02x rel port %02x", + h->path->dev->name, h->group_id, h->rel_port); + dm_enqueue_hw_workq(hwh); + } + + out: + __blk_put_request(req->q, req); +} + +/* + * Issue an INQUIRY VPD page 0x83 command + */ +static void submit_vpd_inquiry(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + struct request *rq; + + rq = prepare_req(hwh, h->buff, h->bufflen, READ); + if (!rq) { + dm_pg_init_complete(h->path, MP_FAIL_PATH); + return; + } + + /* Prepare the command. */ + rq->cmd[0] = INQUIRY; + rq->cmd[1] = 1; + rq->cmd[2] = 0x83; + rq->cmd[4] = h->bufflen; + rq->cmd_len = COMMAND_SIZE(INQUIRY); + + DMINFO("%s: submit vpd inq %x %x %x %x %x %x", + h->path->dev->name, rq->cmd[0], rq->cmd[1], + rq->cmd[2], rq->cmd[3], rq->cmd[4], rq->cmd[5]); + + blk_execute_rq_nowait(rq->q, NULL, rq, 1, vpd_inquiry_endio); +} + +static char print_alua_state(int state) +{ + switch (state) { + case TPGS_STATE_OPTIMIZED: + return 'A'; + case TPGS_STATE_NONOPTIMIZED: + return 'N'; + case TPGS_STATE_STANDBY: + return 'S'; + case TPGS_STATE_UNAVAILABLE: + return 'U'; + case TPGS_STATE_OFFLINE: + return 'O'; + case TPGS_STATE_TRANSITIONING: + return 'T'; + default: + return 'X'; + } +} + +/* + * REPORT TARGET GROUP STATES endio handler + * + * Set the Target Port Group State. If the state + * is not 'active/optimized' we will try to activate + * this group by sending a 'SET TARGET GROUP STATES' + * command. + * If the state is 'offline' we will just fail the + * path. + */ +static void rtpg_endio(struct request *req, int error) +{ + struct hw_handler *hwh = req->end_io_data; + struct alua_handler *h = hwh->context; + struct scsi_sense_hdr sense_hdr; + int len, k, off, valid_states = 0, sense = 0; + char *ucp; + + if (had_failures(req, error)) { + dm_pg_init_complete(h->path, MP_FAIL_PATH); + goto done; + } + + if (status_byte(error) == CHECK_CONDITION) { + scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, + &sense_hdr); + /* Retry if not ready */ + if (sense_hdr.sense_key == NOT_READY) { + DMWARN("%s: device not ready, retry", + h->path->dev->name); + dm_enqueue_hw_workq(hwh); + goto done; + } + /* Retry on Unit Attention */ + sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) | + sense_hdr.ascq; + if (sense == 0x62a06) { + DMWARN("%s: unit attention after state transition", + h->path->dev->name); + dm_enqueue_hw_workq(hwh); + goto done; + } + } + + len = (h->buff[0] << 24) + (h->buff[1] << 16) + + (h->buff[2] << 8) + h->buff[3] + 4; + + if (len > h->bufflen) { + /* Resubmit with the correct length */ + if (realloc_buffer(h, len)) { + DMINFO("%s: kmalloc buffer failed",__FUNCTION__); + /* Temporary failure, bypass */ + dm_pg_init_complete(h->path, MP_BYPASS_PG); + } else { + dm_enqueue_hw_workq(hwh); + } + goto done; + } + + for (k = 4, ucp = h->buff + 4; k < len; k += off, ucp += off) { + if (h->group_id == (ucp[2] << 8) + ucp[3]) { + h->state = ucp[0] & 0x0f; + valid_states = ucp[1]; + } + off = 8 + (ucp[7] * 4); + } + + DMWARN("%s: port group %02x state %c supports %c%c%c%c%c%c", + h->path->dev->name, h->group_id, print_alua_state(h->state), + valid_states&TPGS_SUPPORT_TRANSITION?'T':'t', + valid_states&TPGS_SUPPORT_OFFLINE?'O':'o', + valid_states&TPGS_SUPPORT_UNAVAILABLE?'U':'u', + valid_states&TPGS_SUPPORT_STANDBY?'S':'s', + valid_states&TPGS_SUPPORT_NONOPTIMIZED?'N':'n', + valid_states&TPGS_SUPPORT_OPTIMIZED?'A':'a'); + + if (h->tpgs & TPGS_MODE_EXPLICIT) { + switch (h->state) { + case TPGS_STATE_TRANSITIONING: + /* State transition, retry */ + dm_enqueue_hw_workq(hwh); + break; + case TPGS_STATE_OPTIMIZED: + /* Path in Active/Optmized state, all done */ + dm_pg_init_complete(h->path, 0); + break; + case TPGS_STATE_OFFLINE: + /* Path is offline, fail */ + dm_pg_init_complete(h->path, MP_FAIL_PATH); + break; + default: + /* Switch path to Active/Optimized */ + dm_enqueue_hw_workq(hwh); + break; + } + } else { + /* Only Implicit ALUA support */ + if (h->state == TPGS_STATE_OPTIMIZED || + h->state == TPGS_STATE_NONOPTIMIZED || + h->state == TPGS_STATE_STANDBY) + /* Useable path if active */ + dm_pg_init_complete(h->path, 0); + else + /* Path unuseable for unavailable/offline */ + dm_pg_init_complete(h->path, MP_FAIL_PATH); + } + + done: + __blk_put_request(req->q, req); +} + +/* + * Issue a REPORT TARGET GROUP STATES command. + */ +static void submit_rtpg(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + struct request *rq; + + rq = prepare_req(hwh, h->buff, h->bufflen, READ); + if (!rq) { + dm_pg_init_complete(h->path, MP_FAIL_PATH); + return; + } + + /* Prepare the command. */ + rq->cmd[0] = MAINTENANCE_IN; + rq->cmd[1] = MI_REPORT_TARGET_PGS; + rq->cmd[6] = (h->bufflen >> 24) & 0xff; + rq->cmd[7] = (h->bufflen >> 16) & 0xff; + rq->cmd[8] = (h->bufflen >> 8) & 0xff; + rq->cmd[9] = h->bufflen & 0xff; + rq->cmd_len = COMMAND_SIZE(MAINTENANCE_IN); + + blk_execute_rq_nowait(rq->q, NULL, rq, 1, rtpg_endio); +} + +/* + * SET TARGET GROUP STATES endio handler + * + * We only have to test here if we should resubmit the command; + * any other error is assumed as a failure. + * Maybe we should analyze the sensebuffer here, too. + */ +static void stpg_endio(struct request *req, int error) +{ + struct hw_handler *hwh = req->end_io_data; + struct alua_handler *h = hwh->context; + + switch(host_byte(error)) { + case DID_BUS_BUSY: + if (!h->retry) + break; + h->retry--; + case DID_REQUEUE: + case DID_IMM_RETRY: + dm_enqueue_hw_workq(hwh); + goto done; + } + + if (had_failures(req, error)) { + if (h->tpgs & TPGS_MODE_IMPLICIT) { + /* Ignore errors; the array will figure it out */ + DMWARN("%s: stpg failed %x, disabling explicit mode", + h->path->dev->name, error); + h->tpgs &= ~TPGS_MODE_EXPLICIT; + dm_enqueue_hw_workq(hwh); + } else { + DMWARN("%s: stpg failed %x, disable path", + h->path->dev->name, error); + dm_pg_init_complete(h->path, MP_FAIL_PATH); + } + } else { + DMWARN("%s: port group %02x new state %c", + h->path->dev->name, h->group_id, + print_alua_state(h->state) ); + dm_pg_init_complete(h->path, 0); + } + + done: + __blk_put_request(req->q, req); +} + +/* + * Issue a SET TARGET GROUP STATES command. + * + * Currently we're only setting the current target port group state + * to 'active/optimized' and let the array firmware figure out + * the states of the remaining groups. + */ +static void submit_stpg(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + struct request *rq; + int stpg_len = 8; + + /* Prepare the data buffer */ + memset(h->buff, 0, stpg_len); + h->buff[4] = TPGS_STATE_OPTIMIZED & 0x0f; + h->buff[6] = (h->group_id >> 8) & 0x0f; + h->buff[7] = h->group_id & 0x0f; + + rq = prepare_req(hwh, h->buff, stpg_len, WRITE); + if (!rq) { + dm_pg_init_complete(h->path, MP_FAIL_PATH); + return; + } + + /* Prepare the command. */ + rq->cmd[0] = MAINTENANCE_OUT; + rq->cmd[1] = MO_SET_TARGET_PGS; + rq->cmd[6] = (stpg_len >> 24) & 0xff; + rq->cmd[7] = (stpg_len >> 16) & 0xff; + rq->cmd[8] = (stpg_len >> 8) & 0xff; + rq->cmd[9] = stpg_len & 0xff; + rq->cmd_len = COMMAND_SIZE(MAINTENANCE_OUT); + + blk_execute_rq_nowait(rq->q, NULL, rq, 1, stpg_endio); +} + +/* + * State machine for submitting ALUA commands + */ +static void alua_submit_cmd(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + + DMINFO("%s: tpgs %d group_id %d state %d", + h->path->dev->name, h->tpgs, h->group_id, h->state); + + if (h->tpgs == TPGS_MODE_UNINITIALIZED) + submit_std_inquiry(hwh); + else if (h->tpgs & (TPGS_MODE_IMPLICIT | TPGS_MODE_EXPLICIT) && + h->group_id == -1) + submit_vpd_inquiry(hwh); + else if (h->group_id != -1) + submit_rtpg(hwh); + else if (h->state != TPGS_STATE_OPTIMIZED) + submit_stpg(hwh); +} + +/* + * We're currently switching the port group to be activated only and + * let the array figure out the rest. + * There may be others arrays which require us to switch all port groups + * based on a certain policy. But until we actually encounter them it + * should be okay. + */ +static int alua_create(struct hw_handler *hwh, unsigned argc, char **argv) +{ + struct alua_handler *h; + + /* No arguments */ + if (argc != 0) { + DMWARN("incorrect number of arguments"); + return -EINVAL; + } + + h = kzalloc(sizeof(*h), GFP_KERNEL); + if (!h) + return -ENOMEM; + + hwh->context = h; + h->tpgs = TPGS_MODE_UNINITIALIZED; + h->group_id = -1; + h->rel_port = -1; + h->buff = h->inq; + h->bufflen = ALUA_INQUIRY_SIZE; + + return 0; +} + +static void alua_destroy(struct hw_handler *hwh) +{ + struct alua_handler *h = hwh->context; + + if (h->buff && h->inq != h->buff) + kfree(h->buff); + kfree(h); + hwh->context = NULL; +} + +static unsigned alua_error(struct hw_handler *hwh, struct bio *bio) +{ + /* Try default handler */ + return dm_scsi_err_handler(hwh, bio); +} + +static void alua_pg_init(struct hw_handler *hwh, unsigned bypassed, + struct dm_path *path) +{ + struct alua_handler *h = hwh->context; + + h->path = path; + h->retry = 5; + h->state = TPGS_STATE_OPTIMIZED; + dm_enqueue_hw_workq(hwh); +} + +static struct hw_handler_type alua_handler = { + .name = DM_ALUA_HWH_NAME, + .module = THIS_MODULE, + .create = alua_create, + .destroy = alua_destroy, + .pg_init = alua_pg_init, + .error = alua_error, + .workq_fn = alua_submit_cmd, +}; + +static int __init alua_init(void) +{ + int r = dm_register_hw_handler(&alua_handler); + + if (r < 0) { + DMERR("%s: register failed %d", DM_ALUA_HWH_NAME, r); + return r; + } + + DMINFO("%s: version %s loaded", DM_ALUA_HWH_NAME, DM_ALUA_HWH_VER); + return 0; +} + +static void __exit alua_exit(void) +{ + int r = dm_unregister_hw_handler(&alua_handler); + + if (r < 0) + DMERR("%s: unregister failed %d", DM_ALUA_HWH_NAME, r); +} + +module_init(alua_init); +module_exit(alua_exit); + +MODULE_DESCRIPTION("DM Multipath ALUA support"); +MODULE_AUTHOR("Hannes Reinecke"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DM_ALUA_HWH_VER); diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index 702fcfe..cdd15c8 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -91,6 +91,7 @@ extern const unsigned char scsi_command_size[8]; #define PERSISTENT_RESERVE_OUT 0x5f #define REPORT_LUNS 0xa0 #define MAINTENANCE_IN 0xa3 +#define MAINTENANCE_OUT 0xa4 #define MOVE_MEDIUM 0xa5 #define EXCHANGE_MEDIUM 0xa6 #define READ_12 0xa8 @@ -110,6 +111,8 @@ extern const unsigned char scsi_command_size[8]; #define SAI_READ_CAPACITY_16 0x10 /* values for maintenance in */ #define MI_REPORT_TARGET_PGS 0x0a +/* values for maintenance out */ +#define MO_SET_TARGET_PGS 0x0a /* Values for T10/04-262r7 */ #define ATA_16 0x85 /* 16-byte pass-thru */ -- 1.5.3.2 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel