2 * Soft: multipath device mapper target autoconfig
4 * Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
6 * Author: Copyright (C) 2003 Christophe Varoqui
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 * See the GNU General Public License for more details.
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
23 #include <sys/types.h>
25 #include <linux/kdev_t.h>
27 #include <sys/ioctl.h>
29 #include "libdevmapper/libdevmapper.h"
33 do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
34 void *resp, int mx_resp_len, int noisy)
36 unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
37 { INQUIRY_CMD, 0, 0, 0, 0, 0 };
38 unsigned char sense_b[SENSE_BUFF_LEN];
39 struct sg_io_hdr io_hdr;
45 inqCmdBlk[2] = (unsigned char) pg_op;
46 inqCmdBlk[4] = (unsigned char) mx_resp_len;
47 memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
48 io_hdr.interface_id = 'S';
49 io_hdr.cmd_len = sizeof (inqCmdBlk);
50 io_hdr.mx_sb_len = sizeof (sense_b);
51 io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
52 io_hdr.dxfer_len = mx_resp_len;
54 io_hdr.cmdp = inqCmdBlk;
56 io_hdr.timeout = DEF_TIMEOUT;
58 if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
59 perror("SG_IO (inquiry) error");
63 /* treat SG_ERR here to get rid of sg_err.[ch] */
64 io_hdr.status &= 0x7e;
65 if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
66 (0 == io_hdr.driver_status))
68 if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
69 (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
70 (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
71 if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
73 unsigned char * sense_buffer = io_hdr.sbp;
74 if (sense_buffer[0] & 0x2)
75 sense_key = sense_buffer[1] & 0xf;
77 sense_key = sense_buffer[2] & 0xf;
78 if(RECOVERED_ERROR == sense_key)
88 unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
89 struct sg_io_hdr io_hdr;
90 unsigned char sense_buffer[32];
92 memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
93 io_hdr.interface_id = 'S';
94 io_hdr.cmd_len = sizeof (turCmdBlk);
95 io_hdr.mx_sb_len = sizeof (sense_buffer);
96 io_hdr.dxfer_direction = SG_DXFER_NONE;
97 io_hdr.cmdp = turCmdBlk;
98 io_hdr.sbp = sense_buffer;
99 io_hdr.timeout = 20000;
101 if (ioctl(fd, SG_IO, &io_hdr) < 0) {
105 if (io_hdr.info & SG_INFO_OK_MASK) {
112 sprint_wwid(char * buff, const char * str)
121 for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
123 sprintf(cursor, "%.2x", (int) (unsigned char) c);
126 buff[WWID_SIZE - 1] = '\0';
130 get_lun_strings(int fd, struct path * mypath)
134 if (0 == do_inq(fd, 0, 0, 0, buff, 36, 1)) {
135 memcpy(mypath->vendor_id, &buff[8], 8);
136 memcpy(mypath->product_id, &buff[16], 16);
137 memcpy(mypath->rev, &buff[32], 4);
145 get_serial (int fd, char * str)
147 char buff[MX_ALLOC_LEN + 1];
150 if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
153 memcpy(str, buff + 4, len);
162 /* hardware vendor specifics : add support for new models below */
164 /* this one get EVPD page 0x83 off 8 */
165 /* tested ok with StorageWorks */
167 get_evpd_wwid(int fd, char *str)
171 if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
172 sprint_wwid(str, &buff[8]);
178 /* White list switch */
180 get_unique_id(int fd, struct path * mypath)
186 int (*getuid) (int fd, char * wwid);
188 {"COMPAQ ", "HSV110 (C)COMPAQ", &get_evpd_wwid},
189 {"COMPAQ ", "MSA1000 ", &get_evpd_wwid},
190 {"COMPAQ ", "MSA1000 VOLUME ", &get_evpd_wwid},
191 {"DEC ", "HSG80 ", &get_evpd_wwid},
192 {"HP ", "HSV100 ", &get_evpd_wwid},
193 {"HP ", "A6189A ", &get_evpd_wwid},
194 {"HP ", "OPEN- ", &get_evpd_wwid},
195 {"DDN ", "SAN DataDirector", &get_evpd_wwid},
196 {"FSC ", "CentricStor ", &get_evpd_wwid},
197 {"HITACHI ", "DF400 ", &get_evpd_wwid},
198 {"HITACHI ", "DF500 ", &get_evpd_wwid},
199 {"HITACHI ", "DF600 ", &get_evpd_wwid},
200 {"IBM ", "ProFibre 4000R ", &get_evpd_wwid},
201 {"SGI ", "TP9100 ", &get_evpd_wwid},
202 {"SGI ", "TP9300 ", &get_evpd_wwid},
203 {"SGI ", "TP9400 ", &get_evpd_wwid},
204 {"SGI ", "TP9500 ", &get_evpd_wwid},
208 for (i = 0; wlist[i].vendor; i++) {
209 if (strncmp(mypath->vendor_id, wlist[i].vendor, 8) == 0 &&
210 strncmp(mypath->product_id, wlist[i].product, 16) == 0) {
211 wlist[i].getuid(fd, mypath->wwid);
219 basename(char * str1, char * str2)
221 char *p = str1 + (strlen(str1) - 1);
229 blacklist (char * dev) {
246 for (i = 0; blist[i].lengh; i++) {
247 if (strncmp(dev, blist[i].headstr, blist[i].lengh) == 0)
254 get_all_paths_sysfs(struct env * conf, struct path * all_paths)
258 struct sysfs_directory * sdir;
259 struct sysfs_directory * devp;
260 struct sysfs_link * linkp;
261 char refwwid[WWID_SIZE];
262 char empty_buff[WWID_SIZE];
263 char buff[FILE_NAME_SIZE];
264 char path[FILE_NAME_SIZE];
267 /* if called from udev, only consider the paths that relate to */
268 /* to the device pointed by conf.hotplugdev */
269 memset(empty_buff, 0, WWID_SIZE);
270 memset(refwwid, 0, WWID_SIZE);
271 if (strncmp("/devices", conf->hotplugdev, 8) == 0) {
272 sprintf(buff, "%s%s/block",
273 conf->sysfs_path, conf->hotplugdev);
274 memset(conf->hotplugdev, 0, FILE_NAME_SIZE);
275 readlink(buff, conf->hotplugdev, FILE_NAME_SIZE);
276 basename(conf->hotplugdev, buff);
277 sprintf(curpath.sg_dev, "/dev/%s", buff);
279 if ((sg_fd = open(curpath.sg_dev, O_RDONLY)) < 0)
282 get_lun_strings(sg_fd, &curpath);
283 get_unique_id(sg_fd, &curpath);
284 strcpy(refwwid, curpath.wwid);
285 memset(&curpath, 0, sizeof(path));
288 sprintf(path, "%s/block", conf->sysfs_path);
289 sdir = sysfs_open_directory(path);
290 sysfs_read_directory(sdir);
292 dlist_for_each_data(sdir->subdirs, devp, struct sysfs_directory) {
293 if (blacklist(devp->name))
296 sysfs_read_directory(devp);
298 if(devp->links == NULL)
301 dlist_for_each_data(devp->links, linkp, struct sysfs_link) {
302 if (!strncmp(linkp->name, "device", 6))
310 basename(devp->path, buff);
311 sprintf(curpath.sg_dev, "/dev/%s", buff);
313 if ((sg_fd = open(curpath.sg_dev, O_RDONLY)) < 0) {
315 fprintf(stderr, "can't open %s\n",
320 get_lun_strings(sg_fd, &curpath);
321 get_unique_id(sg_fd, &curpath);
323 if (memcmp(empty_buff, refwwid, WWID_SIZE) != 0 &&
324 strncmp(curpath.wwid, refwwid, WWID_SIZE) != 0) {
325 memset(&curpath, 0, sizeof(path));
329 strcpy(all_paths[k].sg_dev, curpath.sg_dev);
330 strcpy(all_paths[k].dev, curpath.sg_dev);
331 strcpy(all_paths[k].wwid, curpath.wwid);
332 strcpy(all_paths[k].vendor_id, curpath.vendor_id);
333 strcpy(all_paths[k].product_id, curpath.product_id);
334 memset(&curpath, 0, sizeof(path));
335 all_paths[k].state = do_tur(sg_fd);
337 basename(linkp->target, buff);
338 sscanf(buff, "%i:%i:%i:%i",
339 &all_paths[k].sg_id.host_no,
340 &all_paths[k].sg_id.channel,
341 &all_paths[k].sg_id.scsi_id,
342 &all_paths[k].sg_id.lun);
345 sysfs_close_directory(sdir);
350 get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
351 struct scsi_dev * all_scsi_ids)
354 char buff[FILE_NAME_SIZE];
355 char file_name[FILE_NAME_SIZE];
357 for (k = 0; k < conf->max_devs; k++) {
358 strcpy(file_name, "/dev/sg");
359 sprintf(buff, "%d", k);
360 strncat(file_name, buff, FILE_NAME_SIZE);
361 strcpy(all_paths[k].sg_dev, file_name);
362 if ((sg_fd = open(file_name, O_RDONLY)) < 0) {
364 fprintf(stderr, "can't open %s. mknod ?",
368 get_lun_strings(sg_fd, &all_paths[k]);
369 get_unique_id(sg_fd, &all_paths[k]);
370 all_paths[k].state = do_tur(sg_fd);
371 if (0 > ioctl(sg_fd, SG_GET_SCSI_ID, &(all_paths[k].sg_id)))
372 printf("device %s failed on sg ioctl, skip\n",
377 for (i = 0; i < conf->max_devs; i++) {
378 if ((all_paths[k].sg_id.host_no ==
379 all_scsi_ids[i].host_no)
380 && (all_paths[k].sg_id.scsi_id ==
381 (all_scsi_ids[i].scsi_id.dev_id & 0xff))
382 && (all_paths[k].sg_id.lun ==
383 ((all_scsi_ids[i].scsi_id.dev_id >> 8) & 0xff))
384 && (all_paths[k].sg_id.channel ==
385 ((all_scsi_ids[i].scsi_id.
386 dev_id >> 16) & 0xff))) {
387 strcpy(all_paths[k].dev, all_scsi_ids[i].dev);
396 get_all_scsi_ids(struct env * conf, struct scsi_dev * all_scsi_ids)
398 int k, big, little, res, host_no, fd;
400 char fname[FILE_NAME_SIZE];
401 struct scsi_idlun my_scsi_id;
403 for (k = 0; k < conf->max_devs; k++) {
404 strcpy(fname, "/dev/sd");
406 buff[0] = 'a' + (char) k;
409 } else if (k <= 255) { /* assumes sequence goes x,y,z,aa,ab,ac etc */
411 little = k - (26 * big);
414 buff[0] = 'a' + (char) big;
415 buff[1] = 'a' + (char) little;
419 strcat(fname, "xxxx");
421 if ((fd = open(fname, O_RDONLY)) < 0) {
423 fprintf(stderr, "can't open %s. mknod ?",
428 res = ioctl(fd, SCSI_IOCTL_GET_IDLUN, &my_scsi_id);
431 printf("Could not get scsi idlun\n");
435 res = ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &host_no);
438 printf("Could not get host_no\n");
444 strcpy(all_scsi_ids[k].dev, fname);
445 all_scsi_ids[k].scsi_id = my_scsi_id;
446 all_scsi_ids[k].host_no = host_no;
451 /* print_path style */
456 print_path(struct path * all_paths, int k, int style)
459 printf("%s ", all_paths[k].wwid);
462 printf("(%i %i %i %i) ",
463 all_paths[k].sg_id.host_no,
464 all_paths[k].sg_id.channel,
465 all_paths[k].sg_id.scsi_id, all_paths[k].sg_id.lun);
466 printf("%s ", all_paths[k].sg_dev);
467 printf("op:%i ", all_paths[k].state);
468 printf("%s ", all_paths[k].dev);
469 printf("[%.16s]\n", all_paths[k].product_id);
473 print_all_path(struct env * conf, struct path * all_paths)
476 char empty_buff[WWID_SIZE];
478 memset(empty_buff, 0, WWID_SIZE);
479 for (k = 0; k < conf->max_devs; k++) {
480 if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
482 print_path(all_paths, k, ALL);
487 print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
491 for (k = 0; k <= nmp; k++) {
492 printf("%s\n", mp[k].wwid);
493 for (i = 0; i <= mp[k].npaths; i++)
494 print_path(all_paths, PINDEX(k,i), NOWWID);
499 coalesce_paths(struct env * conf, struct multipath * mp,
500 struct path * all_paths)
502 int k, i, nmp, np, already_done;
503 char empty_buff[WWID_SIZE];
507 memset(empty_buff, 0, WWID_SIZE);
509 for (k = 0; k < conf->max_devs - 1; k++) {
510 /* skip this path if no unique id has been found */
511 if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
515 for (i = 0; i <= nmp; i++) {
516 if (0 == strcmp(mp[i].wwid, all_paths[k].wwid))
526 strcpy(mp[nmp].wwid, all_paths[k].wwid);
529 for (i = k + 1; i < conf->max_devs; i++) {
530 if (0 == strcmp(all_paths[k].wwid, all_paths[i].wwid)) {
541 get_disk_size (struct env * conf, char * dev) {
544 char attr_path[FILE_NAME_SIZE];
545 char buff[FILE_NAME_SIZE];
546 char basedev[FILE_NAME_SIZE];
548 if(conf->with_sysfs) {
549 basename(dev, basedev);
550 sprintf(attr_path, "%s/block/%s/size",
551 conf->sysfs_path, basedev);
552 if (0 > sysfs_read_attribute_value(attr_path, buff,
553 FILE_NAME_SIZE * sizeof(char)))
558 if ((fd = open(dev, O_RDONLY)) < 0)
560 if(!ioctl(fd, BLKGETSIZE, &size))
567 make_dm_node(char * str)
570 char buff[FILE_NAME_SIZE];
571 struct dm_names * names;
575 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
578 if (!dm_task_run(dmt))
581 if (!(names = dm_task_get_names(dmt)))
590 if (0 == strcmp(names->name, str))
593 names = (void *) names + next;
596 sprintf(buff, "/dev/mapper/%s", str);
598 mknod(buff, 0600 | S_IFBLK, names->dev);
601 dm_task_destroy(dmt);
607 add_map(struct env * conf, struct path * all_paths,
608 struct multipath * mp, int index, int op)
616 /* defaults for multipath target */
618 char * dm_ps_name = "round-robin";
619 int dm_ps_nr_args = 0;
621 if (!(dmt = dm_task_create(op)))
624 if (!dm_task_set_name(dmt, mp[index].wwid))
626 params_p = ¶ms[0];
629 for (i=0; i<=mp[index].npaths; i++) {
630 if ((1 == all_paths[PINDEX(index,i)].state) &&
631 (0 == all_paths[PINDEX(index,i)].sg_id.scsi_type))
640 params_p += sprintf(params_p, "%i %i %s %i %i",
641 conf->dm_path_test_int, dm_pg_prio,
642 dm_ps_name, np, dm_ps_nr_args);
644 for (i=0; i<=mp[index].npaths; i++) {
645 if (( 0 == all_paths[PINDEX(index,i)].state) ||
646 (0 != all_paths[PINDEX(index,i)].sg_id.scsi_type))
649 size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
650 params_p += sprintf(params_p, " %s",
651 all_paths[PINDEX(index,i)].dev);
658 if (op == DM_DEVICE_RELOAD)
660 if (op == DM_DEVICE_CREATE)
662 printf("%s : 0 %li %s %s\n",
663 mp[index].wwid, size, DM_TARGET, params);
666 if (!dm_task_add_target(dmt, 0, size, DM_TARGET, params))
669 if (!dm_task_run(dmt))
673 make_dm_node(mp[index].wwid);
676 dm_task_destroy(dmt);
681 map_present(char * str)
685 struct dm_names *names;
688 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
691 if (!dm_task_run(dmt))
694 if (!(names = dm_task_get_names(dmt)))
702 if (0 == strcmp(names->name, str))
705 names = (void *) names + next;
709 dm_task_destroy(dmt);
714 usage(char * progname)
716 fprintf(stderr, VERSION_STRING);
717 fprintf(stderr, "Usage: %s [-v|-q] [-d] [-i int] [-m max_devs]\n", progname);
718 fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\n");
719 fprintf(stderr, "\t-i\t\tmultipath target param : polling interval\n");
720 fprintf(stderr, "\t-m max_devs\tscan {max_devs} devices at most\n");
721 fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
722 fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
727 main(int argc, char *argv[])
729 struct multipath * mp;
730 struct path * all_paths;
731 struct scsi_dev * all_scsi_ids;
735 /* Default behaviour */
736 conf.max_devs = MAX_DEVS;
737 conf.dry_run = 0; /* 1 == Do not Create/Update devmaps */
738 conf.verbose = 0; /* 1 == Print all_paths and mp */
739 conf.quiet = 0; /* 1 == Do not even print devmaps */
740 conf.with_sysfs = 0; /* Default to compat / suboptimal behaviour */
741 conf.dm_path_test_int = 10;
743 /* kindly provided by libsysfs */
744 if (0 == sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE))
747 for (i = 1; i < argc; ++i) {
748 if (0 == strcmp("-v", argv[i])) {
752 } else if (0 == strcmp("-m", argv[i])) {
753 conf.max_devs = atoi(argv[++i]);
754 if (conf.max_devs < 2)
756 } else if (0 == strcmp("-q", argv[i])) {
757 if (conf.verbose == 1)
760 } else if (0 == strcmp("-d", argv[i]))
762 else if (0 == strcmp("-i", argv[i]))
763 conf.dm_path_test_int = atoi(argv[++i]);
764 else if (0 == strcmp("scsi", argv[i]))
765 strcpy(conf.hotplugdev, argv[++i]);
766 else if (*argv[i] == '-') {
767 fprintf(stderr, "Unknown switch: %s\n", argv[i]);
769 } else if (*argv[i] != '-') {
770 fprintf(stderr, "Unknown argument\n");
776 /* dynamic allocations */
777 mp = malloc(conf.max_devs * sizeof(struct multipath));
778 all_paths = malloc(conf.max_devs * sizeof(struct path));
779 all_scsi_ids = malloc(conf.max_devs * sizeof(struct scsi_dev));
780 if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL)
783 if (!conf.with_sysfs) {
784 get_all_scsi_ids(&conf, all_scsi_ids);
785 get_all_paths_nosysfs(&conf, all_paths, all_scsi_ids);
787 get_all_paths_sysfs(&conf, all_paths);
789 nmp = coalesce_paths(&conf, mp, all_paths);
792 print_all_path(&conf, all_paths);
793 fprintf(stdout, "\n");
794 print_all_mp(all_paths, mp, nmp);
795 fprintf(stdout, "\n");
801 for (k=0; k<=nmp; k++) {
802 if (map_present(mp[k].wwid)) {
803 add_map(&conf, all_paths, mp, k, DM_DEVICE_RELOAD);
805 add_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);