On ven., 2012-07-27 at 15:55 -0500, Benjamin Marzinski wrote:
> This patch adds a new multipath option "-c", which checks if a device
> belongs to multipath. This can be done during the add uevent for the
> device, before the multipath device has even been created. This allows
> udev to be able to handle multipath path devices differently. To do
> this multipath now keeps track of the wwids of all previously created
> multipath devices in /etc/multipath/wwids. The file creating and
> editting code from alias.[ch] has been split out into file.[ch]. When a
> device is checked to see if it's a multipath path, it's wwid is
> compared against the ones in the wwids file. Also, since the
> uid_attribute may not have been added to the udev database entry for
> the device if this is called in a udev rule, when using the "-c" option,
> get_uid will now also check the process' envirionment variables for the
> uid_attribute.
>
I'd like other distribution maintainers' comments on this one, as it
impacts the multipath-tools intregration with udev.
Hannes ? Did you face the same issue with SuSE ? Did you solve it
differently ?
Ben, does this approach supersedes/extends the "complicated blacklisting
scheme" you proposed earlier ?
Thanks.
> Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
> ---
> libmultipath/Makefile | 2
> libmultipath/alias.c | 153 ---------------------------------------
> libmultipath/alias.h | 1
> libmultipath/configure.c | 3
> libmultipath/defaults.h | 1
> libmultipath/discovery.c | 2
> libmultipath/file.c | 180 +++++++++++++++++++++++++++++++++++++++++++++++
> libmultipath/file.h | 11 ++
> libmultipath/wwids.c | 139 ++++++++++++++++++++++++++++++++++++
> libmultipath/wwids.h | 18 ++++
> multipath/main.c | 37 ++++++++-
> 11 files changed, 389 insertions(+), 158 deletions(-)
>
> Index: multipath-tools-120518/libmultipath/alias.c
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/alias.c
> +++ multipath-tools-120518/libmultipath/alias.c
> @@ -3,19 +3,16 @@
> * Copyright (c) 2005 Benjamin Marzinski, Redhat
> */
> #include <stdlib.h>
> -#include <sys/types.h>
> -#include <sys/stat.h>
> -#include <fcntl.h>
> #include <errno.h>
> #include <unistd.h>
> #include <string.h>
> #include <limits.h>
> #include <stdio.h>
> -#include <signal.h>
>
> #include "debug.h"
> #include "uxsock.h"
> #include "alias.h"
> +#include "file.h"
>
>
> /*
> @@ -36,150 +33,6 @@
> * See the file COPYING included with this distribution for more details.
> */
>
> -static int
> -ensure_directories_exist(char *str, mode_t dir_mode)
> -{
> - char *pathname;
> - char *end;
> - int err;
> -
> - pathname = strdup(str);
> - if (!pathname){
> - condlog(0, "Cannot copy bindings file pathname : %s",
> - strerror(errno));
> - return -1;
> - }
> - end = pathname;
> - /* skip leading slashes */
> - while (end && *end && (*end == '/'))
> - end++;
> -
> - while ((end = strchr(end, '/'))) {
> - /* if there is another slash, make the dir. */
> - *end = '\0';
> - err = mkdir(pathname, dir_mode);
> - if (err && errno != EEXIST) {
> - condlog(0, "Cannot make directory [%s] : %s",
> - pathname, strerror(errno));
> - free(pathname);
> - return -1;
> - }
> - if (!err)
> - condlog(3, "Created dir [%s]", pathname);
> - *end = '/';
> - end++;
> - }
> - free(pathname);
> - return 0;
> -}
> -
> -static void
> -sigalrm(int sig)
> -{
> - /* do nothing */
> -}
> -
> -static int
> -lock_bindings_file(int fd)
> -{
> - struct sigaction act, oldact;
> - sigset_t set, oldset;
> - struct flock lock;
> - int err;
> -
> - memset(&lock, 0, sizeof(lock));
> - lock.l_type = F_WRLCK;
> - lock.l_whence = SEEK_SET;
> -
> - act.sa_handler = sigalrm;
> - sigemptyset(&act.sa_mask);
> - act.sa_flags = 0;
> - sigemptyset(&set);
> - sigaddset(&set, SIGALRM);
> -
> - sigaction(SIGALRM, &act, &oldact);
> - sigprocmask(SIG_UNBLOCK, &set, &oldset);
> -
> - alarm(BINDINGS_FILE_TIMEOUT);
> - err = fcntl(fd, F_SETLKW, &lock);
> - alarm(0);
> -
> - if (err) {
> - if (errno != EINTR)
> - condlog(0, "Cannot lock bindings file : %s",
> - strerror(errno));
> - else
> - condlog(0, "Bindings file is locked. Giving up.");
> - }
> -
> - sigprocmask(SIG_SETMASK, &oldset, NULL);
> - sigaction(SIGALRM, &oldact, NULL);
> - return err;
> -
> -}
> -
> -
> -static int
> -open_bindings_file(char *file, int *can_write)
> -{
> - int fd;
> - struct stat s;
> -
> - if (ensure_directories_exist(file, 0700))
> - return -1;
> - *can_write = 1;
> - fd = open(file, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
> - if (fd < 0) {
> - if (errno == EROFS) {
> - *can_write = 0;
> - condlog(3, "Cannot open bindings file [%s] read/write. "
> - " trying readonly", file);
> - fd = open(file, O_RDONLY);
> - if (fd < 0) {
> - condlog(0, "Cannot open bindings file [%s] "
> - "readonly : %s", file, strerror(errno));
> - return -1;
> - }
> - }
> - else {
> - condlog(0, "Cannot open bindings file [%s] : %s", file,
> - strerror(errno));
> - return -1;
> - }
> - }
> - if (*can_write && lock_bindings_file(fd) < 0)
> - goto fail;
> -
> - memset(&s, 0, sizeof(s));
> - if (fstat(fd, &s) < 0){
> - condlog(0, "Cannot stat bindings file : %s", strerror(errno));
> - goto fail;
> - }
> - if (s.st_size == 0) {
> - if (*can_write == 0)
> - goto fail;
> - /* If bindings file is empty, write the header */
> - size_t len = strlen(BINDINGS_FILE_HEADER);
> - if (write_all(fd, BINDINGS_FILE_HEADER, len) != len) {
> - condlog(0,
> - "Cannot write header to bindings file : %s",
> - strerror(errno));
> - /* cleanup partially written header */
> - if (ftruncate(fd, 0))
> - condlog(0, "Cannot truncate the header : %s",
> - strerror(errno));
> - goto fail;
> - }
> - fsync(fd);
> - condlog(3, "Initialized new bindings file [%s]", file);
> - }
> -
> - return fd;
> -
> -fail:
> - close(fd);
> - return -1;
> -}
>
> static int
> format_devname(char *name, int id, int len, char *prefix)
> @@ -370,7 +223,7 @@ get_user_friendly_alias(char *wwid, char
> return NULL;
> }
>
> - fd = open_bindings_file(file, &can_write);
> + fd = open_file(file, &can_write, BINDINGS_FILE_HEADER);
> if (fd < 0)
> return NULL;
>
> @@ -414,7 +267,7 @@ get_user_friendly_wwid(char *alias, char
> return NULL;
> }
>
> - fd = open_bindings_file(file, &unused);
> + fd = open_file(file, &unused, BINDINGS_FILE_HEADER);
> if (fd < 0)
> return NULL;
>
> Index: multipath-tools-120518/libmultipath/alias.h
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/alias.h
> +++ multipath-tools-120518/libmultipath/alias.h
> @@ -1,4 +1,3 @@
> -#define BINDINGS_FILE_TIMEOUT 30
> #define BINDINGS_FILE_HEADER \
> "# Multipath bindings, Version : 1.0\n" \
> "# NOTE: this file is automatically maintained by the multipath program.\n" \
> Index: multipath-tools-120518/libmultipath/configure.c
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/configure.c
> +++ multipath-tools-120518/libmultipath/configure.c
> @@ -37,6 +37,7 @@
> #include "prio.h"
> #include "util.h"
> #include "uxsock.h"
> +#include "wwids.h"
>
> extern int
> setup_map (struct multipath * mpp, char * params, int params_size)
> @@ -407,6 +408,8 @@ domap (struct multipath * mpp, char * pa
> * DM_DEVICE_CREATE, DM_DEVICE_RENAME, or DM_DEVICE_RELOAD
> * succeeded
> */
> + if (mpp->action == ACT_CREATE)
> + remember_wwid(mpp->wwid);
> if (!conf->daemon) {
> /* multipath client mode */
> dm_switchgroup(mpp->alias, mpp->bestpg);
> Index: multipath-tools-120518/libmultipath/defaults.h
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/defaults.h
> +++ multipath-tools-120518/libmultipath/defaults.h
> @@ -24,5 +24,6 @@
> #define DEFAULT_SOCKET "/var/run/multipathd.sock"
> #define DEFAULT_CONFIGFILE "/etc/multipath.conf"
> #define DEFAULT_BINDINGS_FILE "/etc/multipath/bindings"
> +#define DEFAULT_WWIDS_FILE "/etc/multipath/wwids"
>
> char * set_default (char * str);
> Index: multipath-tools-120518/libmultipath/file.c
> ===================================================================
> --- /dev/null
> +++ multipath-tools-120518/libmultipath/file.c
> @@ -0,0 +1,180 @@
> +/*
> + * Copyright (c) 2005 Christophe Varoqui
> + * Copyright (c) 2005 Benjamin Marzinski, Redhat
> + */
> +#include <stdlib.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <unistd.h>
> +#include <string.h>
> +#include <limits.h>
> +#include <stdio.h>
> +#include <signal.h>
> +
> +#include "file.h"
> +#include "debug.h"
> +#include "uxsock.h"
> +
> +
> +/*
> + * significant parts of this file were taken from iscsi-bindings.c of the
> + * linux-iscsi project.
> + * Copyright (C) 2002 Cisco Systems, Inc.
> + *
> + * 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.
> + *
> + * See the file COPYING included with this distribution for more details.
> + */
> +
> +static int
> +ensure_directories_exist(char *str, mode_t dir_mode)
> +{
> + char *pathname;
> + char *end;
> + int err;
> +
> + pathname = strdup(str);
> + if (!pathname){
> + condlog(0, "Cannot copy file pathname %s : %s",
> + str, strerror(errno));
> + return -1;
> + }
> + end = pathname;
> + /* skip leading slashes */
> + while (end && *end && (*end == '/'))
> + end++;
> +
> + while ((end = strchr(end, '/'))) {
> + /* if there is another slash, make the dir. */
> + *end = '\0';
> + err = mkdir(pathname, dir_mode);
> + if (err && errno != EEXIST) {
> + condlog(0, "Cannot make directory [%s] : %s",
> + pathname, strerror(errno));
> + free(pathname);
> + return -1;
> + }
> + if (!err)
> + condlog(3, "Created dir [%s]", pathname);
> + *end = '/';
> + end++;
> + }
> + free(pathname);
> + return 0;
> +}
> +
> +static void
> +sigalrm(int sig)
> +{
> + /* do nothing */
> +}
> +
> +static int
> +lock_file(int fd, char *file_name)
> +{
> + struct sigaction act, oldact;
> + sigset_t set, oldset;
> + struct flock lock;
> + int err;
> +
> + memset(&lock, 0, sizeof(lock));
> + lock.l_type = F_WRLCK;
> + lock.l_whence = SEEK_SET;
> +
> + act.sa_handler = sigalrm;
> + sigemptyset(&act.sa_mask);
> + act.sa_flags = 0;
> + sigemptyset(&set);
> + sigaddset(&set, SIGALRM);
> +
> + sigaction(SIGALRM, &act, &oldact);
> + sigprocmask(SIG_UNBLOCK, &set, &oldset);
> +
> + alarm(FILE_TIMEOUT);
> + err = fcntl(fd, F_SETLKW, &lock);
> + alarm(0);
> +
> + if (err) {
> + if (errno != EINTR)
> + condlog(0, "Cannot lock %s : %s", file_name,
> + strerror(errno));
> + else
> + condlog(0, "%s is locked. Giving up.", file_name);
> + }
> +
> + sigprocmask(SIG_SETMASK, &oldset, NULL);
> + sigaction(SIGALRM, &oldact, NULL);
> + return err;
> +}
> +
> +int
> +open_file(char *file, int *can_write, char *header)
> +{
> + int fd;
> + struct stat s;
> +
> + if (ensure_directories_exist(file, 0700))
> + return -1;
> + *can_write = 1;
> + fd = open(file, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
> + if (fd < 0) {
> + if (errno == EROFS) {
> + *can_write = 0;
> + condlog(3, "Cannot open file [%s] read/write. "
> + " trying readonly", file);
> + fd = open(file, O_RDONLY);
> + if (fd < 0) {
> + condlog(0, "Cannot open file [%s] "
> + "readonly : %s", file, strerror(errno));
> + return -1;
> + }
> + }
> + else {
> + condlog(0, "Cannot open file [%s] : %s", file,
> + strerror(errno));
> + return -1;
> + }
> + }
> + if (*can_write && lock_file(fd, file) < 0)
> + goto fail;
> +
> + memset(&s, 0, sizeof(s));
> + if (fstat(fd, &s) < 0){
> + condlog(0, "Cannot stat file %s : %s", file, strerror(errno));
> + goto fail;
> + }
> + if (s.st_size == 0) {
> + if (*can_write == 0)
> + goto fail;
> + /* If file is empty, write the header */
> + size_t len = strlen(header);
> + if (write_all(fd, header, len) != len) {
> + condlog(0,
> + "Cannot write header to file %s : %s", file,
> + strerror(errno));
> + /* cleanup partially written header */
> + if (ftruncate(fd, 0))
> + condlog(0, "Cannot truncate header : %s",
> + strerror(errno));
> + goto fail;
> + }
> + fsync(fd);
> + condlog(3, "Initialized new file [%s]", file);
> + }
> +
> + return fd;
> +
> +fail:
> + close(fd);
> + return -1;
> +}
> Index: multipath-tools-120518/libmultipath/file.h
> ===================================================================
> --- /dev/null
> +++ multipath-tools-120518/libmultipath/file.h
> @@ -0,0 +1,11 @@
> +/*
> + * Copyright (c) 2010 Benjamin Marzinski, Redhat
> + */
> +
> +#ifndef _FILE_H
> +#define _FILE_H
> +
> +#define FILE_TIMEOUT 30
> +int open_file(char *file, int *can_write, char *header);
> +
> +#endif /* _FILE_H */
> Index: multipath-tools-120518/multipath/main.c
> ===================================================================
> --- multipath-tools-120518.orig/multipath/main.c
> +++ multipath-tools-120518/multipath/main.c
> @@ -53,6 +53,7 @@
> #include <errno.h>
> #include <sys/time.h>
> #include <sys/resource.h>
> +#include <wwids.h>
> #include "dev_t.h"
>
> int logsink;
> @@ -82,7 +83,7 @@ usage (char * progname)
> {
> fprintf (stderr, VERSION_STRING);
> fprintf (stderr, "Usage:\n");
> - fprintf (stderr, " %s [-d] [-r] [-v lvl] [-p pol] [-b fil] [-q] [dev]\n", progname);
> + fprintf (stderr, " %s [-c] [-d] [-r] [-v lvl] [-p pol] [-b fil] [-q] [dev]\n", progname);
> fprintf (stderr, " %s -l|-ll|-f [-v lvl] [-b fil] [dev]\n", progname);
> fprintf (stderr, " %s -F [-v lvl]\n", progname);
> fprintf (stderr, " %s -t\n", progname);
> @@ -95,6 +96,7 @@ usage (char * progname)
> " -ll show multipath topology (maximum info)\n" \
> " -f flush a multipath device map\n" \
> " -F flush all multipath device maps\n" \
> + " -c check if a device should be a path in a multipath device\n" \
> " -q allow queue_if_no_path when multipathd is not running\n"\
> " -d dry run, do not create or update devmaps\n" \
> " -t dump internal hardware table\n" \
> @@ -209,6 +211,7 @@ get_dm_mpvec (vector curmp, vector pathv
>
> if (!conf->dry_run)
> reinstate_paths(mpp);
> + remember_wwid(mpp->wwid);
> }
> return 0;
> }
> @@ -259,9 +262,13 @@ configure (void)
> * if we have a blacklisted device parameter, exit early
> */
> if (dev &&
> - (filter_devnode(conf->blist_devnode, conf->elist_devnode, dev) > 0))
> - goto out;
> -
> + (filter_devnode(conf->blist_devnode,
> + conf->elist_devnode, dev) > 0)) {
> + if (conf->dry_run == 2)
> + printf("%s is not a valid multipath device path\n",
> + conf->dev);
> + goto out;
> + }
> /*
> * scope limiting must be translated into a wwid
> * failing the translation is fatal (by policy)
> @@ -277,6 +284,15 @@ configure (void)
> if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
> refwwid) > 0)
> goto out;
> + if (conf->dry_run == 2) {
> + if (check_wwids_file(refwwid, 0) == 0){
> + printf("%s is a valid multipath device path\n", conf->dev);
> + r = 0;
> + }
> + else
> + printf("%s is not a valid multipath device path\n", conf->dev);
> + goto out;
> + }
> }
>
> /*
> @@ -412,7 +428,7 @@ main (int argc, char *argv[])
> if (load_config(DEFAULT_CONFIGFILE))
> exit(1);
>
> - while ((arg = getopt(argc, argv, ":dhl::FfM:v:p:b:Brtq")) != EOF ) {
> + while ((arg = getopt(argc, argv, ":dchl::FfM:v:p:b:Brtq")) != EOF ) {
> switch(arg) {
> case 1: printf("optarg : %s\n",optarg);
> break;
> @@ -434,8 +450,12 @@ main (int argc, char *argv[])
> case 'q':
> conf->allow_queueing = 1;
> break;
> + case 'c':
> + conf->dry_run = 2;
> + break;
> case 'd':
> - conf->dry_run = 1;
> + if (!conf->dry_run)
> + conf->dry_run = 1;
> break;
> case 'f':
> conf->remove = FLUSH_ONE;
> @@ -517,6 +537,11 @@ main (int argc, char *argv[])
> }
> dm_init();
>
> + if (conf->dry_run == 2 &&
> + (!conf->dev || conf->dev_type == DEV_DEVMAP)) {
> + condlog(0, "the -c option requires a path to check");
> + goto out;
> + }
> if (conf->remove == FLUSH_ONE) {
> if (conf->dev_type == DEV_DEVMAP)
> r = dm_flush_map(conf->dev);
> Index: multipath-tools-120518/libmultipath/Makefile
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/Makefile
> +++ multipath-tools-120518/libmultipath/Makefile
> @@ -15,7 +15,7 @@ OBJS = memory.o parser.o vector.o devmap
> pgpolicies.o debug.o regex.o defaults.o uevent.o \
> switchgroup.o uxsock.o print.o alias.o log_pthread.o \
> log.o configure.o structs_vec.o sysfs.o prio.o checkers.o \
> - lock.o waiter.o
> + lock.o waiter.o file.o wwids.o
>
> LIBDM_API_FLUSH = $(shell grep -Ecs '^[a-z]*[[:space:]]+dm_task_no_flush' /usr/include/libdevmapper.h)
>
> Index: multipath-tools-120518/libmultipath/wwids.c
> ===================================================================
> --- /dev/null
> +++ multipath-tools-120518/libmultipath/wwids.c
> @@ -0,0 +1,139 @@
> +#include <stdlib.h>
> +#include <errno.h>
> +#include <unistd.h>
> +#include <string.h>
> +#include <limits.h>
> +#include <stdio.h>
> +
> +#include "checkers.h"
> +#include "vector.h"
> +#include "structs.h"
> +#include "debug.h"
> +#include "uxsock.h"
> +#include "file.h"
> +#include "wwids.h"
> +#include "defaults.h"
> +
> +/*
> + * Copyright (c) 2010 Benjamin Marzinski, Redhat
> + */
> +
> +static int
> +lookup_wwid(FILE *f, char *wwid) {
> + int c;
> + char buf[LINE_MAX];
> + int count;
> +
> + while ((c = fgetc(f)) != EOF){
> + if (c != '/') {
> + if (fgets(buf, LINE_MAX, f) == NULL)
> + return 0;
> + else
> + continue;
> + }
> + count = 0;
> + while ((c = fgetc(f)) != '/') {
> + if (c == EOF)
> + return 0;
> + if (count >= WWID_SIZE - 1)
> + goto next;
> + if (wwid[count] == '\0')
> + goto next;
> + if (c != wwid[count++])
> + goto next;
> + }
> + if (wwid[count] == '\0')
> + return 1;
> +next:
> + if (fgets(buf, LINE_MAX, f) == NULL)
> + return 0;
> + }
> + return 0;
> +}
> +
> +static int
> +write_out_wwid(int fd, char *wwid) {
> + int ret;
> + off_t offset;
> + char buf[WWID_SIZE + 3];
> +
> + ret = snprintf(buf, WWID_SIZE + 3, "/%s/\n", wwid);
> + if (ret >= (WWID_SIZE + 3) || ret < 0){
> + condlog(0, "can't format wwid for writing (%d) : %s",
> + ret, strerror(errno));
> + return -1;
> + }
> + offset = lseek(fd, 0, SEEK_END);
> + if (offset < 0) {
> + condlog(0, "can't seek to the end of wwids file : %s",
> + strerror(errno));
> + return -1;
> + }
> + if (write_all(fd, buf, strlen(buf)) != strlen(buf)) {
> + condlog(0, "cannot write wwid to wwids file : %s",
> + strerror(errno));
> + if (ftruncate(fd, offset))
> + condlog(0, "cannot truncate failed wwid write : %s",
> + strerror(errno));
> + return -1;
> + }
> + return 1;
> +}
> +
> +int
> +check_wwids_file(char *wwid, int write_wwid)
> +{
> + int fd, can_write, found, ret;
> + FILE *f;
> + fd = open_file(DEFAULT_WWIDS_FILE, &can_write, WWIDS_FILE_HEADER);
> + if (fd < 0)
> + return -1;
> +
> + f = fdopen(fd, "r");
> + if (!f) {
> + condlog(0,"can't fdopen wwids file : %s", strerror(errno));
> + close(fd);
> + return -1;
> + }
> + found = lookup_wwid(f, wwid);
> + if (found) {
> + ret = 0;
> + goto out;
> + }
> + if (!write_wwid) {
> + ret = -1;
> + goto out;
> + }
> + if (!can_write) {
> + condlog(0, "wwids file is read-only. Can't write wwid");
> + ret = -1;
> + goto out;
> + }
> +
> + if (fflush(f) != 0) {
> + condlog(0, "cannot fflush wwids file stream : %s",
> + strerror(errno));
> + ret = -1;
> + goto out;
> + }
> +
> + ret = write_out_wwid(fd, wwid);
> +out:
> + fclose(f);
> + return ret;
> +}
> +
> +int
> +remember_wwid(char *wwid)
> +{
> + int ret = check_wwids_file(wwid, 1);
> + if (ret < 0){
> + condlog(3, "failed writing wwid %s to wwids file", wwid);
> + return -1;
> + }
> + if (ret == 1)
> + condlog(3, "wrote wwid %s to wwids file", wwid);
> + else
> + condlog(4, "wwid %s already in wwids file", wwid);
> + return 0;
> +}
> Index: multipath-tools-120518/libmultipath/wwids.h
> ===================================================================
> --- /dev/null
> +++ multipath-tools-120518/libmultipath/wwids.h
> @@ -0,0 +1,18 @@
> +/*
> + * Copyright (c) 2010 Benjamin Marzinski, Redhat
> + */
> +
> +#ifndef _WWIDS_H
> +#define _WWIDS_H
> +
> +#define WWIDS_FILE_HEADER \
> +"# Multipath wwids, Version : 1.0\n" \
> +"# NOTE: This file is automatically maintained by multipath and multipathd.\n" \
> +"# You should not need to edit this file in normal circumstances.\n" \
> +"#\n" \
> +"# Valid WWIDs:\n"
> +
> +int remember_wwid(char *wwid);
> +int check_wwids_file(char *wwid, int write_wwid);
> +
> +#endif /* _WWIDS_H */
> Index: multipath-tools-120518/libmultipath/discovery.c
> ===================================================================
> --- multipath-tools-120518.orig/libmultipath/discovery.c
> +++ multipath-tools-120518/libmultipath/discovery.c
> @@ -810,6 +810,8 @@ get_uid (struct path * pp)
>
> memset(pp->wwid, 0, WWID_SIZE);
> value = udev_device_get_property_value(pp->udev, pp->uid_attribute);
> + if ((!value || strlen(value) == 0) && conf->dry_run == 2)
> + value = getenv(pp->uid_attribute);
> if (value && strlen(value)) {
> size_t len = WWID_SIZE;
>
--
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