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[PATCH] Add multipath "extra" program from Christophe Varoqui, <christophe.varoqui@free.fr>

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Christophe Varoqui, <christophe.varoqui@free.fr>

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That's all there is to it!

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2003-09-18 Christophe Varoqui <christophe.varoqui@free.fr>
* multipath 0.0.1 released.
* Initial release.

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# Makefile
#
# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
EXEC = multipath
prefix = /usr/local
exec_prefix = ${prefix}
bindir = ${exec_prefix}/bin
CC = gcc
CFLAGS = -g -O2 -Wall -Wunused -Wstrict-prototypes
LDFLAGS = -lsysfs -ldevmapper
OBJS = main.o sg_err.o
all: $(EXEC)
strip $(EXEC)
@echo ""
@echo "Make complete"
$(EXEC): $(OBJS)
$(CC) $(OBJS) -o $(EXEC) $(LDFLAGS)
clean:
rm -f core *.o $(EXEC)
install:
install -d $(bindir)
install -m 755 $(EXEC) $(bindir)/
# Code dependencies
main.o: main.c main.h sg_err.h sg_include.h
sg_err.o: sg_err.c sg_err.h sg_include.h

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Dependancies :
==============
o libdevmapper : comes with device-mapper-XXXX.tar.gz
See www.sistina.com
o libsysfs : comes with sysutils
See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
How it works :
==============
Fill the all_paths array. Each path store this info :
struct path {
char dev[FILE_NAME_SIZE];
char sg_dev[FILE_NAME_SIZE];
struct scsi_idlun scsi_id;
struct sg_id sg_id;
int state;
char wwid[WWID_SIZE];
};
scsi_id, sg_dev and sg_id are only really useful for 2.4
kernels, for which SG cmnds must go through sg devs.
In 2.5+ we have the nice opportunity to send SG cmnds
through SCSI bdevs.
For 2.4 compat, we pivot on idlun tupple to map sg devs
to SCSI bdevs.
2.4 does not do device enumeration, so we must scan a
defined number of sg devs and scsi bdevs. Good enough.
In 2.5+, we rely on libsysfs (sysutils) to access to
sysfs device enums.
the wwid is retrieved by a switch fonction. Only White
Listed HW can filled this field. For now only
StorageWorks HW is White Listed. (See notes)
When all_paths is filled, we coalesce the paths and store
the result in mp array. Each mp is a struct like this :
struct multipath {
char wwid[WWID_SIZE];
int npaths;
int pindex[MAX_MP_PATHS];
};
When mp is filled, the device maps are fed to the kernel
through libdevmapper. Stale paths (failed TUR) are
discarded.
Notes :
=======
o make sure you have enough /dev/sg* nodes
(/dev/MAKEDEV if necesary)
o path coalescing relies on a path unique id being found.
This unique id, lacking a standard method, is vendor
specific. A switch function (get_unique_id) is present
and an example function is provided for storageworks
arrays (get_storageworks_wwid). Feel free to enrich
with hardware you have at hand :)
o Something goes wrong with sd.o, qla2200 & dm-mod
refcounting : I can't unload these modules after exec.
o The kernel does NOT manage properly ghosts paths
with StorageWorks HW. Seems nobody cares after a load
of posts to linux-scsi.
o 2.4.21 version of DM does not like even segment size.
if you enconter pbs with this, upgrade DM.
Credits :
=========
o Heavy cut'n paste from sg_utils. Thanks goes to D.
Gilbert.
o Light cut'n paste from dmsetup. Thanks Joe Thornber.
o Greg KH for the nice sysfs API.

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0.0.5

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/*
* Soft: Description here...
*
* Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
*
* Author: Copyright (C) 2003 Christophe Varoqui
*
* 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.
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/kdev_t.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <libsysfs.h>
#include <libdevmapper.h>
#include "main.h"
static int
do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
void *resp, int mx_resp_len, int noisy)
{
int res;
unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
{ INQUIRY_CMD, 0, 0, 0, 0, 0 };
unsigned char sense_b[SENSE_BUFF_LEN];
struct sg_io_hdr io_hdr;
if (cmddt)
inqCmdBlk[1] |= 2;
if (evpd)
inqCmdBlk[1] |= 1;
inqCmdBlk[2] = (unsigned char) pg_op;
inqCmdBlk[4] = (unsigned char) mx_resp_len;
memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof (inqCmdBlk);
io_hdr.mx_sb_len = sizeof (sense_b);
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr.dxfer_len = mx_resp_len;
io_hdr.dxferp = resp;
io_hdr.cmdp = inqCmdBlk;
io_hdr.sbp = sense_b;
io_hdr.timeout = DEF_TIMEOUT;
if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
perror("SG_IO (inquiry) error");
return -1;
}
res = sg_err_category3(&io_hdr);
switch (res) {
case SG_ERR_CAT_CLEAN:
case SG_ERR_CAT_RECOVERED:
return 0;
default:
return -1;
}
}
static int
do_tur(int fd)
{
unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
struct sg_io_hdr io_hdr;
unsigned char sense_buffer[32];
memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof (turCmdBlk);
io_hdr.mx_sb_len = sizeof (sense_buffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
io_hdr.cmdp = turCmdBlk;
io_hdr.sbp = sense_buffer;
io_hdr.timeout = 20000;
io_hdr.pack_id = 0;
if (ioctl(fd, SG_IO, &io_hdr) < 0) {
close(fd);
return 0;
}
if (io_hdr.info & SG_INFO_OK_MASK) {
return 0;
}
return 1;
}
static void
sprint_wwid(char * buff, const char * str)
{
int i;
const char *p;
char *cursor;
unsigned char c;
p = str;
cursor = buff;
for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
c = *p++;
sprintf(cursor, "%.2x", (int) (unsigned char) c);
cursor += 2;
}
buff[WWID_SIZE - 1] = '\0';
}
static int
get_lun_strings(int fd, struct path * mypath)
{
char buff[36];
if (0 == do_inq(fd, 0, 0, 0, buff, 36, 1)) {
memcpy(mypath->vendor_id, &buff[8], 8);
memcpy(mypath->product_id, &buff[16], 16);
memcpy(mypath->rev, &buff[32], 4);
return 1;
}
return 0;
}
/*
static int
get_serial (int fd, char * str)
{
char buff[MX_ALLOC_LEN + 1];
int len;
if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
len = buff[3];
if (len > 0) {
memcpy(str, buff + 4, len);
buff[len] = '\0';
}
return 1;
}
return 0;
}
*/
/* hardware vendor specifics : add support for new models below */
static int
get_storageworks_wwid(int fd, char *str)
{
char buff[64];
if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
sprint_wwid(str, &buff[8]);
return 1;
}
return 0;
}
/* White list switch */
static int
get_unique_id(int fd, struct path * mypath)
{
if (strncmp(mypath->product_id, "HSV110 (C)COMPAQ", 16) == 0 ||
strncmp(mypath->product_id, "HSG80 ", 16) == 0) {
get_storageworks_wwid(fd, mypath->wwid);
return 0;
}
return 1;
}
static void
basename(char * str1, char * str2)
{
char *p = str1 + (strlen(str1) - 1);
while (*--p != '/')
continue;
strcpy(str2, ++p);
}
static int
get_all_paths_sysfs(struct env * conf, struct path * all_paths)
{
int k=0;
int sg_fd;
struct sysfs_directory * sdir;
struct sysfs_directory * devp;
struct sysfs_dlink * linkp;
char buff[FILE_NAME_SIZE];
char block_path[FILE_NAME_SIZE];
sprintf(block_path, "%s/block", conf->sysfs_path);
sdir = sysfs_open_directory(block_path);
sysfs_read_directory(sdir);
devp = sdir->subdirs;
while (devp != NULL) {
sysfs_read_directory(devp);
linkp = devp->links;
while (linkp != NULL) {
if (!strncmp(linkp->name, "device", 6))
break;
linkp = linkp->next;
}
if (linkp == NULL) {
devp = devp->next;
continue;
}
basename(devp->path, buff);
sprintf(all_paths[k].sg_dev, "/dev/%s", buff);
strcpy(all_paths[k].dev, all_paths[k].sg_dev);
if ((sg_fd = open(all_paths[k].sg_dev, O_RDONLY)) < 0) {
devp = devp->next;
continue;
}
get_lun_strings(sg_fd, &all_paths[k]);
get_unique_id(sg_fd, &all_paths[k]);
all_paths[k].state = do_tur(sg_fd);
close(sg_fd);
basename(linkp->target->path, buff);
sscanf(buff, "%i:%i:%i:%i",
&all_paths[k].sg_id.host_no,
&all_paths[k].sg_id.channel,
&all_paths[k].sg_id.scsi_id,
&all_paths[k].sg_id.lun);
k++;
devp = devp->next;
}
sysfs_close_directory(sdir);
return 0;
}
static int
get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
struct scsi_dev * all_scsi_ids)
{
int k, i, sg_fd;
char buff[FILE_NAME_SIZE];
char file_name[FILE_NAME_SIZE];
for (k = 0; k < conf->max_devs; k++) {
strcpy(file_name, "/dev/sg");
sprintf(buff, "%d", k);
strncat(file_name, buff, FILE_NAME_SIZE);
strcpy(all_paths[k].sg_dev, file_name);
if ((sg_fd = open(file_name, O_RDONLY)) < 0)
continue;
get_lun_strings(sg_fd, &all_paths[k]);
get_unique_id(sg_fd, &all_paths[k]);
all_paths[k].state = do_tur(sg_fd);
if (0 > ioctl(sg_fd, SG_GET_SCSI_ID, &(all_paths[k].sg_id)))
printf("device %s failed on sg ioctl, skip\n",
file_name);
close(sg_fd);
for (i = 0; i < conf->max_devs; i++) {
if ((all_paths[k].sg_id.host_no ==
all_scsi_ids[i].host_no)
&& (all_paths[k].sg_id.scsi_id ==
(all_scsi_ids[i].scsi_id.dev_id & 0xff))
&& (all_paths[k].sg_id.lun ==
((all_scsi_ids[i].scsi_id.dev_id >> 8) & 0xff))
&& (all_paths[k].sg_id.channel ==
((all_scsi_ids[i].scsi_id.
dev_id >> 16) & 0xff))) {
strcpy(all_paths[k].dev, all_scsi_ids[i].dev);
break;
}
}
}
return 0;
}
static int
get_all_scsi_ids(struct env * conf, struct scsi_dev * all_scsi_ids)
{
int k, big, little, res, host_no, fd;
char buff[64];
char fname[FILE_NAME_SIZE];
struct scsi_idlun my_scsi_id;
for (k = 0; k < conf->max_devs; k++) {
strcpy(fname, "/dev/sd");
if (k < 26) {
buff[0] = 'a' + (char) k;
buff[1] = '\0';
strcat(fname, buff);
} else if (k <= 255) { /* assumes sequence goes x,y,z,aa,ab,ac etc */
big = k / 26;
little = k - (26 * big);
big = big - 1;
buff[0] = 'a' + (char) big;
buff[1] = 'a' + (char) little;
buff[2] = '\0';
strcat(fname, buff);
} else
strcat(fname, "xxxx");
if ((fd = open(fname, O_RDONLY)) < 0)
continue;
res = ioctl(fd, SCSI_IOCTL_GET_IDLUN, &my_scsi_id);
if (res < 0) {
close(fd);
printf("Could not get scsi idlun\n");
continue;
}
res = ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &host_no);
if (res < 0) {
close(fd);
printf("Could not get host_no\n");
continue;
}
close(fd);
strcpy(all_scsi_ids[k].dev, fname);
all_scsi_ids[k].scsi_id = my_scsi_id;
all_scsi_ids[k].host_no = host_no;
}
return 0;
}
/* print_path style */
#define ALL 0
#define NOWWID 1
static void
print_path(struct path * all_paths, int k, int style)
{
if (style != NOWWID)
printf("%s ", all_paths[k].wwid);
else
printf(" \\_");
printf("(%i %i %i %i) ",
all_paths[k].sg_id.host_no,
all_paths[k].sg_id.channel,
all_paths[k].sg_id.scsi_id, all_paths[k].sg_id.lun);
printf("%s ", all_paths[k].sg_dev);
printf("op:%i ", all_paths[k].state);
printf("%s ", all_paths[k].dev);
printf("[%.16s]\n", all_paths[k].product_id);
}
static void
print_all_path(struct env * conf, struct path * all_paths)
{
int k;
char empty_buff[WWID_SIZE];
memset(empty_buff, 0, WWID_SIZE);
for (k = 0; k < conf->max_devs; k++) {
if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
continue;
print_path(all_paths, k, ALL);
}
}
static void
print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
{
int k, i;
for (k = 0; k <= nmp; k++) {
printf("%s\n", mp[k].wwid);
for (i = 0; i <= mp[k].npaths; i++)
print_path(all_paths, PINDEX(k,i), NOWWID);
}
}
static int
coalesce_paths(struct env * conf, struct multipath * mp,
struct path * all_paths)
{
int k, i, nmp, np, already_done;
char empty_buff[WWID_SIZE];
nmp = -1;
already_done = 0;
memset(empty_buff, 0, WWID_SIZE);
for (k = 0; k < conf->max_devs - 1; k++) {
/* skip this path if no unique id has been found */
if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
continue;
np = 0;
for (i = 0; i <= nmp; i++) {
if (0 == strcmp(mp[i].wwid, all_paths[k].wwid))
already_done = 1;
}
if (already_done) {
already_done = 0;
continue;
}
nmp++;
strcpy(mp[nmp].wwid, all_paths[k].wwid);
PINDEX(nmp,np) = k;
for (i = k + 1; i < conf->max_devs; i++) {
if (0 == strcmp(all_paths[k].wwid, all_paths[i].wwid)) {
np++;
PINDEX(nmp,np) = i;
mp[nmp].npaths = np;
}
}
}
return nmp;
}
static long
get_disk_size (struct env * conf, char * dev) {
long size;
int fd;
char attr_path[FILE_NAME_SIZE];
char buff[FILE_NAME_SIZE];
char basedev[FILE_NAME_SIZE];
if(conf->with_sysfs) {
basename(dev, basedev);
sprintf(attr_path, "%s/block/%s/size",
conf->sysfs_path, basedev);
if (0 > sysfs_read_attribute_value(attr_path, buff,
FILE_NAME_SIZE * sizeof(char)))
return -1;
size = atoi(buff);
return size;
} else {
if ((fd = open(dev, O_RDONLY)) < 0)
return -1;
if(!ioctl(fd, BLKGETSIZE, &size))
return size;
}
return -1;
}
static int
make_dm_node(char * str)
{
int r = 0;
dev_t dev;
char buff[FILE_NAME_SIZE];
int major, minor;
struct dm_names * names;
unsigned next = 0;
struct dm_task *dmt;
if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
return 0;
if (!dm_task_run(dmt))
goto out;
if (!(names = dm_task_get_names(dmt)))
goto out;
if (!names->dev) {
r = 1;
goto out;
}
do {
if (0 == strcmp(names->name, str))
break;
next = names->next;
names = (void *) names + next;
} while (next);
major = (int) MAJOR(names->dev);
minor = (int) MINOR(names->dev);
dev = major << sizeof(dev_t);
dev = dev | minor;
sprintf(buff, "/dev/mapper/%s", str);
unlink(buff);
mknod(buff, 0600 | S_IFBLK, dev);
out:
dm_task_destroy(dmt);
return r;
}
/* future use ?
static int
del_map(char * str) {
struct dm_task *dmt;
if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
return 0;
if (!dm_task_set_name(dmt, str))
goto delout;
if (!dm_task_run(dmt))
goto delout;
printf("Deleted device map : %s\n", str);
delout:
dm_task_destroy(dmt);
return 1;
}
*/
static int
add_map(struct env * conf, struct path * all_paths,
struct multipath * mp, int index, int op)
{
char params[255];
char * params_p;
struct dm_task *dmt;
int i, np;
long size = -1;
if (!(dmt = dm_task_create(op)))
return 0;
if (!dm_task_set_name(dmt, mp[index].wwid))
goto addout;
params_p = &params[0];
np = 0;
for (i=0; i<=mp[index].npaths; i++) {
if ((1 == all_paths[PINDEX(index,i)].state) &&
(0 == all_paths[PINDEX(index,i)].sg_id.scsi_type))
np++;
}
if (np == 0)
goto addout;
params_p += sprintf(params_p, "%i 32", np);
for (i=0; i<=mp[index].npaths; i++) {
if (( 0 == all_paths[PINDEX(index,i)].state) ||
(0 != all_paths[PINDEX(index,i)].sg_id.scsi_type))
continue;
if (size < 0)
size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
params_p += sprintf(params_p, " %s %i",
all_paths[PINDEX(index,i)].dev, 0);
}
if (size < 0)
goto addout;
if (!conf->quiet) {
if (op == DM_DEVICE_RELOAD)
printf("U|");
if (op == DM_DEVICE_CREATE)
printf("N|");
printf("%s : 0 %li %s %s\n",
mp[index].wwid, size, DM_TARGET, params);
}
if (!dm_task_add_target(dmt, 0, size, DM_TARGET, params))
goto addout;
if (!dm_task_run(dmt))
goto addout;
make_dm_node(mp[index].wwid);
addout:
dm_task_destroy(dmt);
return 1;
}
/*
static int
get_table(const char * str)
{
int r = 0;
struct dm_task *dmt;
void *next = NULL;
uint64_t start, length;
char *target_type = NULL;
char *params;
if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
return 0;
if (!dm_task_set_name(dmt, str))
goto out;
if (!dm_task_run(dmt))
goto out;
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, &params);
if (target_type) {
printf("%" PRIu64 " %" PRIu64 " %s %s\n",
start, length, target_type, params);
}
} while (next);
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
*/
static int
map_present(char * str)
{
int r = 0;
struct dm_task *dmt;
struct dm_names *names;
unsigned next = 0;
if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
return 0;
if (!dm_task_run(dmt))
goto out;
if (!(names = dm_task_get_names(dmt)))
goto out;
if (!names->dev) {
goto out;
}
do {
if (0 == strcmp(names->name, str))
r = 1;
next = names->next;
names = (void *) names + next;
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static void
usage(char * progname)
{
fprintf(stderr, VERSION_STRING);
fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]\n", progname);
fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\n");
fprintf(stderr, "\t-m max_devs\tscan {max_devs} devices at most\n");
exit(1);
}
int
main(int argc, char *argv[])
{
struct multipath * mp;
struct path * all_paths;
struct scsi_dev * all_scsi_ids;
struct env conf;
int i, k, nmp;
/* Default behaviour */
conf.max_devs = MAX_DEVS;
conf.dry_run = 0; /* 1 == Do not Create/Update devmaps */
conf.verbose = 0; /* 1 == Print all_paths and mp */
conf.quiet = 0; /* 1 == Do not even print devmaps */
conf.with_sysfs = 0; /* Default to compat / suboptimal behaviour */
/* kindly provided by libsysfs */
if (0 == sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE))
conf.with_sysfs = 1;
for (i = 1; i < argc; ++i) {
if (0 == strcmp("-v", argv[i])) {
if (conf.quiet == 1)
usage(argv[0]);
conf.verbose = 1;
} else if (0 == strcmp("-m", argv[i])) {
conf.max_devs = atoi(argv[++i]);
if (conf.max_devs < 2)
usage(argv[0]);
} else if (0 == strcmp("-q", argv[i])) {
if (conf.verbose == 1)
usage(argv[0]);
conf.quiet = 1;
} else if (0 == strcmp("-d", argv[i]))
conf.dry_run = 1;
else if (*argv[i] == '-') {
fprintf(stderr, "Unknown switch: %s\n", argv[i]);
usage(argv[0]);
} else if (*argv[i] != '-') {
fprintf(stderr, "Unknown argument\n");
usage(argv[0]);
}
}
/* dynamic allocations */
mp = malloc(conf.max_devs * sizeof(struct multipath));
all_paths = malloc(conf.max_devs * sizeof(struct path));
all_scsi_ids = malloc(conf.max_devs * sizeof(struct scsi_dev));
if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL)
exit(1);
if (!conf.with_sysfs) {
get_all_scsi_ids(&conf, all_scsi_ids);
get_all_paths_nosysfs(&conf, all_paths, all_scsi_ids);
} else {
get_all_paths_sysfs(&conf, all_paths);
}
nmp = coalesce_paths(&conf, mp, all_paths);
if (conf.verbose) {
print_all_path(&conf, all_paths);
printf("\n");
print_all_mp(all_paths, mp, nmp);
printf("\n");
}
if (conf.dry_run)
exit(0);
for (k=0; k<=nmp; k++) {
if (map_present(mp[k].wwid)) {
add_map(&conf, all_paths, mp, k, DM_DEVICE_RELOAD);
} else {
add_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);
}
}
exit(0);
}

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/*
* Soft: Description here...
*
* Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
*
* Author: Copyright (C) 2003 Christophe Varoqui
*
* 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.
*
* 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.
*/
#ifndef _MAIN_H
#define _MAIN_H
/* local includes */
#include "sg_include.h"
#include "sg_err.h"
/* global defs */
#define WWID_SIZE 33
#define MAX_DEVS 128
#define MAX_MP MAX_DEVS / 2
#define MAX_MP_PATHS MAX_DEVS / 4
#define FILE_NAME_SIZE 256
#define INQUIRY_CMDLEN 6
#define INQUIRY_CMD 0x12
#define SENSE_BUFF_LEN 32
#define DEF_TIMEOUT 60000
#define EBUFF_SZ 256
#define TUR_CMD_LEN 6
#define MX_ALLOC_LEN 255
#define BLKGETSIZE _IO(0x12,96)
#define DM_TARGET "striped"
#define PINDEX(x,y) mp[(x)].pindex[(y)]
/* global types */
struct scsi_idlun {
int dev_id;
int host_unique_id;
int host_no;
};
struct sg_id {
int host_no;
int channel;
int scsi_id;
int lun;
int scsi_type;
short h_cmd_per_lun;
short d_queue_depth;
int unused1;
int unused2;
};
struct scsi_dev {
char dev[FILE_NAME_SIZE];
struct scsi_idlun scsi_id;
int host_no;
};
struct path {
char dev[FILE_NAME_SIZE];
char sg_dev[FILE_NAME_SIZE];
struct scsi_idlun scsi_id;
struct sg_id sg_id;
int state;
char wwid[WWID_SIZE];
char vendor_id[8];
char product_id[16];
char rev[4];
};
struct multipath {
char wwid[WWID_SIZE];
int npaths;
int pindex[MAX_MP_PATHS];
};
struct env {
int max_devs;
int verbose;
int quiet;
int dry_run;
int with_sysfs;
char sysfs_path[FILE_NAME_SIZE];
};
/* Build version */
#define PROG "multipath"
#define VERSION_CODE 0x000005
#define DATE_CODE 0x120903
#define MULTIPATH_VERSION(version) \
(version >> 16) & 0xFF, \
(version >> 8) & 0xFF, \
version & 0xFF
#define VERSION_STRING PROG" v%d.%d.%d (%.2d/%.2d, 20%.2d)\n", \
MULTIPATH_VERSION(VERSION_CODE), \
MULTIPATH_VERSION(DATE_CODE)
#endif

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#ifndef SG_ERR_H
#define SG_ERR_H
/* Feel free to copy and modify this GPL-ed code into your applications. */
/* Version 0.90 (20030519)
*/
/* Some of the following error/status codes are exchanged between the
various layers of the SCSI sub-system in Linux and should never
reach the user. They are placed here for completeness. What appears
here is copied from drivers/scsi/scsi.h which is not visible in
the user space. */
#ifndef SCSI_CHECK_CONDITION
/* Following are the "true" SCSI status codes. Linux has traditionally
used a 1 bit right and masked version of these. So now CHECK_CONDITION
and friends (in <scsi/scsi.h>) are deprecated. */
#define SCSI_CHECK_CONDITION 0x2
#define SCSI_CONDITION_MET 0x4
#define SCSI_BUSY 0x8
#define SCSI_IMMEDIATE 0x10
#define SCSI_IMMEDIATE_CONDITION_MET 0x14
#define SCSI_RESERVATION_CONFLICT 0x18
#define SCSI_COMMAND_TERMINATED 0x22
#define SCSI_TASK_SET_FULL 0x28
#define SCSI_ACA_ACTIVE 0x30
#define SCSI_TASK_ABORTED 0x40
#endif
/* The following are 'host_status' codes */
#ifndef DID_OK
#define DID_OK 0x00
#endif
#ifndef DID_NO_CONNECT
#define DID_NO_CONNECT 0x01 /* Unable to connect before timeout */
#define DID_BUS_BUSY 0x02 /* Bus remain busy until timeout */
#define DID_TIME_OUT 0x03 /* Timed out for some other reason */
#define DID_BAD_TARGET 0x04 /* Bad target (id?) */
#define DID_ABORT 0x05 /* Told to abort for some other reason */
#define DID_PARITY 0x06 /* Parity error (on SCSI bus) */
#define DID_ERROR 0x07 /* Internal error */
#define DID_RESET 0x08 /* Reset by somebody */
#define DID_BAD_INTR 0x09 /* Received an unexpected interrupt */
#define DID_PASSTHROUGH 0x0a /* Force command past mid-level */
#define DID_SOFT_ERROR 0x0b /* The low-level driver wants a retry */
#endif
/* These defines are to isolate applictaions from kernel define changes */
#define SG_ERR_DID_OK DID_OK
#define SG_ERR_DID_NO_CONNECT DID_NO_CONNECT
#define SG_ERR_DID_BUS_BUSY DID_BUS_BUSY
#define SG_ERR_DID_TIME_OUT DID_TIME_OUT
#define SG_ERR_DID_BAD_TARGET DID_BAD_TARGET
#define SG_ERR_DID_ABORT DID_ABORT
#define SG_ERR_DID_PARITY DID_PARITY
#define SG_ERR_DID_ERROR DID_ERROR
#define SG_ERR_DID_RESET DID_RESET
#define SG_ERR_DID_BAD_INTR DID_BAD_INTR
#define SG_ERR_DID_PASSTHROUGH DID_PASSTHROUGH
#define SG_ERR_DID_SOFT_ERROR DID_SOFT_ERROR
/* The following are 'driver_status' codes */
#ifndef DRIVER_OK
#define DRIVER_OK 0x00
#endif
#ifndef DRIVER_BUSY
#define DRIVER_BUSY 0x01
#define DRIVER_SOFT 0x02
#define DRIVER_MEDIA 0x03
#define DRIVER_ERROR 0x04
#define DRIVER_INVALID 0x05
#define DRIVER_TIMEOUT 0x06
#define DRIVER_HARD 0x07
#define DRIVER_SENSE 0x08 /* Sense_buffer has been set */
/* Following "suggests" are "or-ed" with one of previous 8 entries */
#define SUGGEST_RETRY 0x10
#define SUGGEST_ABORT 0x20
#define SUGGEST_REMAP 0x30
#define SUGGEST_DIE 0x40
#define SUGGEST_SENSE 0x80
#define SUGGEST_IS_OK 0xff
#endif
#ifndef DRIVER_MASK
#define DRIVER_MASK 0x0f
#endif
#ifndef SUGGEST_MASK
#define SUGGEST_MASK 0xf0
#endif
/* These defines are to isolate applictaions from kernel define changes */
#define SG_ERR_DRIVER_OK DRIVER_OK
#define SG_ERR_DRIVER_BUSY DRIVER_BUSY
#define SG_ERR_DRIVER_SOFT DRIVER_SOFT
#define SG_ERR_DRIVER_MEDIA DRIVER_MEDIA
#define SG_ERR_DRIVER_ERROR DRIVER_ERROR
#define SG_ERR_DRIVER_INVALID DRIVER_INVALID
#define SG_ERR_DRIVER_TIMEOUT DRIVER_TIMEOUT
#define SG_ERR_DRIVER_HARD DRIVER_HARD
#define SG_ERR_DRIVER_SENSE DRIVER_SENSE
#define SG_ERR_SUGGEST_RETRY SUGGEST_RETRY
#define SG_ERR_SUGGEST_ABORT SUGGEST_ABORT
#define SG_ERR_SUGGEST_REMAP SUGGEST_REMAP
#define SG_ERR_SUGGEST_DIE SUGGEST_DIE
#define SG_ERR_SUGGEST_SENSE SUGGEST_SENSE
#define SG_ERR_SUGGEST_IS_OK SUGGEST_IS_OK
#define SG_ERR_DRIVER_MASK DRIVER_MASK
#define SG_ERR_SUGGEST_MASK SUGGEST_MASK
/* The following "print" functions send ACSII to stdout */
extern void sg_print_command(const unsigned char * command);
extern void sg_print_sense(const char * leadin,
const unsigned char * sense_buffer, int sb_len);
extern void sg_print_status(int masked_status);
extern void sg_print_scsi_status(int scsi_status);
extern void sg_print_host_status(int host_status);
extern void sg_print_driver_status(int driver_status);
/* sg_chk_n_print() returns 1 quietly if there are no errors/warnings
else it prints to standard output and returns 0. */
extern int sg_chk_n_print(const char * leadin, int masked_status,
int host_status, int driver_status,
const unsigned char * sense_buffer, int sb_len);
/* The following function declaration is for the sg version 3 driver.
Only version 3 sg_err.c defines it. */
struct sg_io_hdr;
extern int sg_chk_n_print3(const char * leadin, struct sg_io_hdr * hp);
/* The following "category" function returns one of the following */
#define SG_ERR_CAT_CLEAN 0 /* No errors or other information */
#define SG_ERR_CAT_MEDIA_CHANGED 1 /* interpreted from sense buffer */
#define SG_ERR_CAT_RESET 2 /* interpreted from sense buffer */
#define SG_ERR_CAT_TIMEOUT 3
#define SG_ERR_CAT_RECOVERED 4 /* Successful command after recovered err */
#define SG_ERR_CAT_SENSE 98 /* Something else is in the sense buffer */
#define SG_ERR_CAT_OTHER 99 /* Some other error/warning has occurred */
extern int sg_err_category(int masked_status, int host_status,
int driver_status, const unsigned char * sense_buffer,
int sb_len);
extern int sg_err_category_new(int scsi_status, int host_status,
int driver_status, const unsigned char * sense_buffer,
int sb_len);
/* The following function declaration is for the sg version 3 driver.
Only version 3 sg_err.c defines it. */
extern int sg_err_category3(struct sg_io_hdr * hp);
/* Returns length of SCSI command given the opcode (first byte) */
extern int sg_get_command_size(unsigned char opcode);
extern void sg_get_command_name(unsigned char opcode, int buff_len,
char * buff);
#endif

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extras/multipath/sg_include.h Normal file
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#ifdef SG_KERNEL_INCLUDES
#define __user
typedef unsigned char u8;
#include "/usr/src/linux/include/scsi/sg.h"
#include "/usr/src/linux/include/scsi/scsi.h"
#else
#ifdef SG_TRICK_GNU_INCLUDES
#include <linux/../scsi/sg.h>
#include <linux/../scsi/scsi.h>
#else
#include <scsi/sg.h>
#include <scsi/scsi.h>
#endif
#endif
/*
Getting the correct include files for the sg interface can be an ordeal.
In a perfect world, one would just write:
#include <scsi/sg.h>
#include <scsi/scsi.h>
This would include the files found in the /usr/include/scsi directory.
Those files are maintained with the GNU library which may or may not
agree with the kernel and version of sg driver that is running. Any
many cases this will not matter. However in some it might, for example
glibc 2.1's include files match the sg driver found in the lk 2.2
series. Hence if glibc 2.1 is used with lk 2.4 then the additional
sg v3 interface will not be visible.
If this is a problem then defining SG_KERNEL_INCLUDES will access the
kernel supplied header files (assuming they are in the normal place).
The GNU library maintainers and various kernel people don't like
this approach (but it does work).
The technique selected by defining SG_TRICK_GNU_INCLUDES worked (and
was used) prior to glibc 2.2 . Prior to that version /usr/include/linux
was a symbolic link to /usr/src/linux/include/linux .
There are other approaches if this include "mixup" causes pain. These
would involve include files being copied or symbolic links being
introduced.
Sorry about the inconvenience. Typically neither SG_KERNEL_INCLUDES
nor SG_TRICK_GNU_INCLUDES is defined.
dpg 20010415, 20030522
*/