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git://sourceware.org/git/lvm2.git
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742 lines
19 KiB
C
742 lines
19 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "base/memory/zalloc.h"
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#include "lib/misc/lib.h"
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#include "lib/activate/activate.h"
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#include "lib/commands/toolcontext.h"
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#include "lib/device/device_id.h"
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#include "lib/datastruct/str_list.h"
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#include "device_mapper/misc/dm-ioctl.h"
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#ifdef UDEV_SYNC_SUPPORT
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#include <libudev.h>
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#include "lib/device/dev-ext-udev-constants.h"
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#endif
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#include <dirent.h>
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#include <ctype.h>
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#define MPATH_PREFIX "mpath-"
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/*
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* This hash table keeps track of whether a given dm device
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* is a mpath device or not.
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*
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* If dm-3 is an mpath device, then the constant "2" is stored in
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* the hash table with the key of the dm minor number ("3" for dm-3).
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* If dm-3 is not an mpath device, then the constant "1" is stored in
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* the hash table with the key of the dm minor number.
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*/
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static struct dm_pool *_wwid_mem;
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static struct dm_hash_table *_minor_hash_tab;
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static struct dm_hash_table *_wwid_hash_tab;
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static struct dm_list _ignored;
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static struct dm_list _ignored_exceptions;
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#define MAX_WWID_LINE 512
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static void _read_blacklist_file(const char *path)
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{
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FILE *fp;
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char line[MAX_WWID_LINE];
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char wwid[MAX_WWID_LINE];
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char *word;
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int section_black = 0;
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int section_exceptions = 0;
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int found_quote;
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int found_type;
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int i, j;
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if (!(fp = fopen(path, "r")))
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return;
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while (fgets(line, sizeof(line), fp)) {
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word = NULL;
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/* skip initial white space on the line */
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for (i = 0; i < MAX_WWID_LINE; i++) {
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if ((line[i] == '\n') || (line[i] == '\0'))
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break;
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if (isspace(line[i]))
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continue;
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word = &line[i];
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break;
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}
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if (!word || word[0] == '#')
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continue;
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/* identify the start of the section we want to read */
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if (strchr(word, '{')) {
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if (!strncmp(word, "blacklist_exceptions", 20))
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section_exceptions = 1;
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else if (!strncmp(word, "blacklist", 9))
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section_black = 1;
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continue;
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}
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/* identify the end of the section we've been reading */
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if (strchr(word, '}')) {
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section_exceptions = 0;
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section_black = 0;
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continue;
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}
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/* skip lines that are not in a section we want */
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if (!section_black && !section_exceptions)
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continue;
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/*
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* read a wwid from the blacklist{_exceptions} section.
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* does not recognize other non-wwid entries in the
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* section, and skips those (should the entire mp
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* config filtering be disabled if non-wwids are seen?
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*/
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if (!strstr(word, "wwid"))
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continue;
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i += 4; /* skip "wwid" */
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/*
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* copy wwid value from the line.
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* the wwids copied here need to match the
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* wwids read from /etc/multipath/wwids,
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* which are matched to wwids from sysfs.
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*/
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memset(wwid, 0, sizeof(wwid));
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found_quote = 0;
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found_type = 0;
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j = 0;
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for (; i < MAX_WWID_LINE; i++) {
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if ((line[i] == '\n') || (line[i] == '\0'))
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break;
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if (!j && isspace(line[i]))
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continue;
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if (isspace(line[i]))
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break;
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/* quotes around wwid are optional */
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if ((line[i] == '"') && !found_quote) {
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found_quote = 1;
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continue;
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}
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/* second quote is end of wwid */
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if ((line[i] == '"') && found_quote)
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break;
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/* exclude initial 3/2/1 for naa/eui/t10 */
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if (!j && !found_type &&
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((line[i] == '3') || (line[i] == '2') || (line[i] == '1'))) {
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found_type = 1;
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continue;
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}
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wwid[j] = line[i];
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j++;
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}
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if (j < 8)
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continue;
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log_debug("multipath wwid %s in %s %s",
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wwid, section_exceptions ? "blacklist_exceptions" : "blacklist", path);
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if (section_exceptions) {
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if (!str_list_add(_wwid_mem, &_ignored_exceptions, dm_pool_strdup(_wwid_mem, wwid)))
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stack;
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} else {
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if (!str_list_add(_wwid_mem, &_ignored, dm_pool_strdup(_wwid_mem, wwid)))
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stack;
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}
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}
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if (fclose(fp))
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stack;
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}
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static void _read_wwid_exclusions(void)
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{
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static const char _mpath_conf[] = "/etc/multipath/conf.d";
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char path[PATH_MAX] = { 0 };
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DIR *dir;
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struct dirent *de;
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struct dm_str_list *sl, *sl2;
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int rem_count = 0;
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_read_blacklist_file("/etc/multipath.conf");
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if ((dir = opendir(_mpath_conf))) {
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while ((de = readdir(dir))) {
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if (de->d_name[0] == '.')
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continue;
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snprintf(path, sizeof(path), "%s/%s", _mpath_conf, de->d_name);
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_read_blacklist_file(path);
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}
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if (closedir(dir))
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log_sys_debug("closedir", _mpath_conf);
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}
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/* for each wwid in ignored_exceptions, remove it from ignored */
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dm_list_iterate_items_safe(sl, sl2, &_ignored) {
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if (str_list_match_item(&_ignored_exceptions, sl->str))
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str_list_del(&_ignored, sl->str);
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}
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/* for each wwid in ignored, remove it from wwid_hash */
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dm_list_iterate_items(sl, &_ignored) {
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dm_hash_remove_binary(_wwid_hash_tab, sl->str, strlen(sl->str));
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rem_count++;
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}
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if (rem_count)
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log_debug("multipath config ignored %d wwids", rem_count);
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}
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static void _read_wwid_file(const char *config_wwids_file, int *entries)
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{
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FILE *fp;
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char line[MAX_WWID_LINE];
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char *wwid, *p;
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char typestr[2] = { 0 };
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int count = 0;
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if (config_wwids_file[0] != '/') {
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log_print_unless_silent("Ignoring unknown multipath_wwids_file.");
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return;
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}
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if (!(fp = fopen(config_wwids_file, "r"))) {
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log_debug("multipath wwids file not found");
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return;
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}
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while (fgets(line, sizeof(line), fp)) {
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if (line[0] == '#')
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continue;
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wwid = line;
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if (line[0] == '/')
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wwid++;
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/*
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* the initial character is the id type,
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* 1 is t10, 2 is eui, 3 is naa, 8 is scsi name.
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* wwids are stored in the hash table without the type charater.
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* It seems that sometimes multipath does not include
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* the type charater (seen with t10 scsi_debug devs).
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*/
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typestr[0] = *wwid;
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if (typestr[0] == '1' || typestr[0] == '2' || typestr[0] == '3')
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wwid++;
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if ((p = strchr(wwid, '/')))
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*p = '\0';
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(void) dm_hash_insert_binary(_wwid_hash_tab, wwid, strlen(wwid), (void*)1);
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count++;
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}
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if (fclose(fp))
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stack;
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log_debug("multipath wwids read %d from %s", count, config_wwids_file);
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*entries = count;
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}
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int dev_mpath_init(const char *config_wwids_file)
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{
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struct dm_pool *mem;
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struct dm_hash_table *minor_tab;
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struct dm_hash_table *wwid_tab;
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int entries = 0;
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dm_list_init(&_ignored);
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dm_list_init(&_ignored_exceptions);
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if (!(mem = dm_pool_create("mpath", 256))) {
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log_error("mpath pool creation failed.");
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return 0;
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}
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if (!(minor_tab = dm_hash_create(110))) {
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log_error("mpath hash table creation failed.");
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dm_pool_destroy(mem);
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return 0;
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}
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_wwid_mem = mem;
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_minor_hash_tab = minor_tab;
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/* multipath_wwids_file="" disables the use of the file */
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if (config_wwids_file && !strlen(config_wwids_file)) {
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log_debug("multipath wwids file disabled.");
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return 1;
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}
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if (!(wwid_tab = dm_hash_create(110))) {
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log_error("mpath hash table creation failed.");
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dm_hash_destroy(_minor_hash_tab);
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dm_pool_destroy(_wwid_mem);
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_minor_hash_tab = NULL;
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_wwid_mem = NULL;
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return 0;
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}
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_wwid_hash_tab = wwid_tab;
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if (config_wwids_file) {
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_read_wwid_file(config_wwids_file, &entries);
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_read_wwid_exclusions();
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}
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if (!entries) {
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/* reading dev wwids is skipped with null wwid_hash_tab */
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dm_hash_destroy(_wwid_hash_tab);
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_wwid_hash_tab = NULL;
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}
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return 1;
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}
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void dev_mpath_exit(void)
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{
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if (_minor_hash_tab)
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dm_hash_destroy(_minor_hash_tab);
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if (_wwid_hash_tab)
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dm_hash_destroy(_wwid_hash_tab);
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if (_wwid_mem)
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dm_pool_destroy(_wwid_mem);
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_minor_hash_tab = NULL;
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_wwid_hash_tab = NULL;
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_wwid_mem = NULL;
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}
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/*
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* given "/dev/foo" return "foo"
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*/
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static const char *_get_sysfs_name(struct device *dev)
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{
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const char *name;
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if (!(name = strrchr(dev_name(dev), '/'))) {
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log_error("Cannot find '/' in device name.");
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return NULL;
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}
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name++;
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if (!*name) {
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log_error("Device name is not valid.");
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return NULL;
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}
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return name;
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}
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/*
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* given major:minor
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* readlink translates /sys/dev/block/major:minor to /sys/.../foo
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* from /sys/.../foo return "foo"
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*/
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static const char *_get_sysfs_name_by_devt(const char *sysfs_dir, dev_t devno,
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char *buf, size_t buf_size)
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{
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const char *name;
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char path[PATH_MAX];
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int size;
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if (dm_snprintf(path, sizeof(path), "%sdev/block/%u:%u", sysfs_dir,
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MAJOR(devno), MINOR(devno)) < 0) {
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log_error("Sysfs path string is too long.");
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return NULL;
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}
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if ((size = readlink(path, buf, buf_size - 1)) < 0) {
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log_sys_error("readlink", path);
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return NULL;
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}
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buf[size] = '\0';
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if (!(name = strrchr(buf, '/'))) {
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log_error("Cannot find device name in sysfs path.");
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return NULL;
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}
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name++;
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return name;
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}
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#ifdef UDEV_SYNC_SUPPORT
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static int _dev_is_mpath_component_udev(struct device *dev)
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{
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const char *value;
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struct dev_ext *ext;
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/*
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* external_device_info_source="udev" enables these udev checks.
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* external_device_info_source="none" disables them.
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*/
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if (!(ext = dev_ext_get(dev)))
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return_0;
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value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_BLKID_TYPE);
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if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH))
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return 1;
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value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_MPATH_DEVICE_PATH);
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if (value && !strcmp(value, "1"))
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return 1;
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return 0;
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}
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#else
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static int _dev_is_mpath_component_udev(struct device *dev)
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{
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return 0;
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}
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#endif
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/* mpath_devno is major:minor of the dm multipath device currently using the component dev. */
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static int _dev_is_mpath_component_sysfs(struct cmd_context *cmd, struct device *dev,
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int primary_result, dev_t primary_dev, dev_t *mpath_devno)
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{
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struct dev_types *dt = cmd->dev_types;
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const char *name; /* e.g. "sda" for "/dev/sda" */
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char link_path[PATH_MAX]; /* some obscure, unpredictable sysfs path */
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char holders_path[PATH_MAX]; /* e.g. "/sys/block/sda/holders/" */
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char dm_dev_path[PATH_MAX]; /* e.g. "/dev/dm-1" */
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char uuid[DM_UUID_LEN];
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char *holder_name; /* e.g. "dm-1" */
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const char *sysfs_dir = dm_sysfs_dir();
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DIR *dr;
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struct dirent *de;
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unsigned dev_major = MAJOR(dev->dev);
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unsigned dev_minor = MINOR(dev->dev);
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unsigned dm_dev_major;
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unsigned dm_dev_minor;
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struct stat info;
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int is_mpath_component = 0;
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switch (primary_result) {
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case 2: /* The dev is partition. */
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/* gets "foo" for "/dev/foo" where "/dev/foo" comes from major:minor */
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if (!(name = _get_sysfs_name_by_devt(sysfs_dir, primary_dev, link_path, sizeof(link_path))))
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return_0;
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break;
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case 1: /* The dev is already a primary dev. Just continue with the dev. */
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/* gets "foo" for "/dev/foo" */
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if (!(name = _get_sysfs_name(dev)))
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return_0;
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break;
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default: /* 0, error. */
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log_warn("Failed to get primary device for %u:%u.", dev_major, dev_minor);
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return 0;
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}
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if (dm_snprintf(holders_path, sizeof(holders_path), "%sblock/%s/holders", sysfs_dir, name) < 0) {
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log_warn("Sysfs path to check mpath is too long.");
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return 0;
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}
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/* also will filter out partitions */
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if (stat(holders_path, &info))
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return 0;
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if (!S_ISDIR(info.st_mode)) {
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log_warn("Path %s is not a directory.", holders_path);
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return 0;
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}
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/*
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* If any holder is a dm mpath device, then return 1;
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*/
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if (!(dr = opendir(holders_path))) {
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log_debug("Device %s has no holders dir", dev_name(dev));
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return 0;
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}
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while ((de = readdir(dr))) {
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if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
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continue;
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/*
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* holder_name is e.g. "dm-1"
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* dm_dev_path is then e.g. "/dev/dm-1"
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*/
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holder_name = de->d_name;
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if (dm_snprintf(dm_dev_path, sizeof(dm_dev_path), "%s/%s", cmd->dev_dir, holder_name) < 0) {
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log_warn("dm device path to check mpath is too long.");
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continue;
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}
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/*
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* stat "/dev/dm-1" which is the holder of the dev we're checking
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* dm_dev_major:dm_dev_minor come from stat("/dev/dm-1")
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*/
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if (stat(dm_dev_path, &info)) {
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log_debug_devs("dev_is_mpath_component %s holder %s stat result %d",
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dev_name(dev), dm_dev_path, errno);
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continue;
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}
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dm_dev_major = MAJOR(info.st_rdev);
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dm_dev_minor = MINOR(info.st_rdev);
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if (dm_dev_major != dt->device_mapper_major) {
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log_debug_devs("dev_is_mpath_component %s holder %s %d:%d does not have dm major",
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dev_name(dev), dm_dev_path, dm_dev_major, dm_dev_minor);
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continue;
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}
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/*
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* A previous call may have checked if dm_dev_minor is mpath and saved
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* the result in the hash table. If there's a saved result just use that.
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*
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* The minor number of "/dev/dm-1" is added to the hash table with
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* const value 2 meaning that dm minor 1 (for /dev/dm-1) is a multipath dev
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* and const value 1 meaning that dm minor 1 is not a multipath dev.
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*/
|
|
|
|
if (_minor_hash_tab) {
|
|
void *d = dm_hash_lookup_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor));
|
|
long look = (long) d;
|
|
if (look > 0) {
|
|
log_debug_devs("dev_is_mpath_component %s holder %s %u:%u already checked as %sbeing mpath.",
|
|
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor, (look > 1) ? "" : "not ");
|
|
|
|
is_mpath_component = (look == 2);
|
|
goto out;
|
|
}
|
|
|
|
/* no saved result for dm_dev_minor, so check the uuid for it */
|
|
}
|
|
|
|
/* Check whether holder's UUID uses MPATH prefix */
|
|
/* TODO: reuse/merge with dev_has_mpath_uuid() as this function also recognizes kpartx partition */
|
|
if (device_get_uuid(cmd, dm_dev_major, dm_dev_minor, uuid, sizeof(uuid)) &&
|
|
!strncmp(uuid, MPATH_PREFIX, sizeof(MPATH_PREFIX) - 1)) {
|
|
log_debug_devs("dev_is_mpath_component %s holder %s %u:%u ignore mpath component",
|
|
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor);
|
|
|
|
/* For future checks, save that the dm minor refers to mpath ("2" == is mpath) */
|
|
if (_minor_hash_tab)
|
|
(void) dm_hash_insert_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor), (void*)2);
|
|
|
|
is_mpath_component = 1;
|
|
goto out;
|
|
}
|
|
|
|
/* For future checks, save that the dm minor does not refer to mpath ("1" == is not mpath) */
|
|
if (_minor_hash_tab)
|
|
(void) dm_hash_insert_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor), (void*)1);
|
|
}
|
|
|
|
out:
|
|
if (closedir(dr))
|
|
log_sys_debug("closedir", holders_path);
|
|
|
|
if (is_mpath_component)
|
|
*mpath_devno = MKDEV(dm_dev_major, dm_dev_minor);
|
|
return is_mpath_component;
|
|
}
|
|
|
|
static int _dev_in_wwid_file(struct cmd_context *cmd, struct device *dev,
|
|
int primary_result, dev_t primary_dev)
|
|
{
|
|
char idbuf[DEV_WWID_SIZE] = { 0 };
|
|
struct dev_wwid *dw;
|
|
char *wwid, *full_wwid;
|
|
|
|
if (!_wwid_hash_tab)
|
|
return 0;
|
|
|
|
/*
|
|
* Check the primary device, not the partition.
|
|
*/
|
|
if (primary_result == 2) {
|
|
if (!(dev = dev_cache_get_by_devt(cmd, primary_dev))) {
|
|
log_debug("dev_is_mpath_component %s no primary dev", dev_name(dev));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* sysfs wwid uses format: naa.<value>, eui.<value>, t10.<value>.
|
|
* multipath wwids file uses format: 3<value>, 2<value>, 1<value>.
|
|
*
|
|
* We omit the type prefix before looking up. The multipath/wwids
|
|
* values in the wwid_hash_tab have the initial character removed.
|
|
*
|
|
* There's no type prefix for "scsi name string" type 8 ids.
|
|
*
|
|
* First try looking up any wwids that have already been read.
|
|
*/
|
|
lookup:
|
|
dm_list_iterate_items(dw, &dev->wwids) {
|
|
if (dw->type == 1 || dw->type == 2 || dw->type == 3)
|
|
wwid = &dw->id[4];
|
|
else
|
|
wwid = dw->id;
|
|
|
|
if (dm_hash_lookup_binary(_wwid_hash_tab, wwid, strlen(wwid))) {
|
|
full_wwid = dw->id;
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The id from sysfs wwid may not be the id used by multipath,
|
|
* or a device may not have a vpd_pg83 file (e.g. nvme).
|
|
*/
|
|
|
|
if (!(dev->flags & DEV_ADDED_VPD_WWIDS) && dev_read_vpd_wwids(cmd, dev))
|
|
goto lookup;
|
|
|
|
if (!(dev->flags & DEV_ADDED_SYS_WWID) && dev_read_sys_wwid(cmd, dev, idbuf, sizeof(idbuf), &dw)) {
|
|
if (dw->type == 1 || dw->type == 2 || dw->type == 3)
|
|
wwid = &dw->id[4];
|
|
else
|
|
wwid = dw->id;
|
|
|
|
if (dm_hash_lookup_binary(_wwid_hash_tab, wwid, strlen(wwid))) {
|
|
full_wwid = dw->id;
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
found:
|
|
log_debug_devs("dev_is_mpath_component %s %s in wwids file", dev_name(dev), full_wwid);
|
|
return 1;
|
|
}
|
|
|
|
int dev_is_mpath_component(struct cmd_context *cmd, struct device *dev, dev_t *holder_devno)
|
|
{
|
|
struct dev_types *dt = cmd->dev_types;
|
|
int primary_result;
|
|
dev_t primary_dev;
|
|
|
|
/*
|
|
* multipath only uses SCSI or NVME devices
|
|
*/
|
|
if (!major_is_scsi_device(dt, MAJOR(dev->dev)) && !dev_is_nvme(dt, dev))
|
|
return 0;
|
|
|
|
/*
|
|
* primary_result 2: dev is a partition, primary_dev is the whole device
|
|
* primary_result 1: dev is a whole device
|
|
*/
|
|
if (!(primary_result = dev_get_primary_dev(dt, dev, &primary_dev)))
|
|
return_0;
|
|
|
|
if (_dev_is_mpath_component_sysfs(cmd, dev, primary_result, primary_dev, holder_devno) == 1)
|
|
goto found;
|
|
|
|
if (_dev_in_wwid_file(cmd, dev, primary_result, primary_dev))
|
|
goto found;
|
|
|
|
if (external_device_info_source() == DEV_EXT_UDEV) {
|
|
if (_dev_is_mpath_component_udev(dev) == 1)
|
|
goto found;
|
|
}
|
|
|
|
/*
|
|
* TODO: save the result of this function in dev->flags and use those
|
|
* flags on repeated calls to avoid repeating the work multiple times
|
|
* for the same device when there are partitions on the device.
|
|
*/
|
|
|
|
return 0;
|
|
found:
|
|
return 1;
|
|
}
|
|
|
|
const char *dev_mpath_component_wwid(struct cmd_context *cmd, struct device *dev)
|
|
{
|
|
char slaves_path[PATH_MAX];
|
|
char wwid_path[PATH_MAX];
|
|
char sysbuf[PATH_MAX] = { 0 };
|
|
char *slave_name;
|
|
const char *wwid = NULL;
|
|
DIR *dr;
|
|
struct dirent *de;
|
|
|
|
/* /sys/dev/block/253:7/slaves/sda/device/wwid */
|
|
|
|
if (dm_snprintf(slaves_path, sizeof(slaves_path), "%sdev/block/%u:%u/slaves",
|
|
dm_sysfs_dir(), MAJOR(dev->dev), MINOR(dev->dev)) < 0) {
|
|
log_warn("Sysfs path to check mpath components is too long.");
|
|
return NULL;
|
|
}
|
|
|
|
/* Get wwid from first component */
|
|
|
|
if (!(dr = opendir(slaves_path))) {
|
|
if (errno == ENOTDIR)
|
|
log_warn("WARNING: Path %s is not a directory.", slaves_path);
|
|
else if (errno != ENOENT)
|
|
log_sys_debug("opendir", slaves_path);
|
|
return NULL;
|
|
}
|
|
|
|
while ((de = readdir(dr))) {
|
|
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
|
|
continue;
|
|
|
|
/* slave_name "sda" */
|
|
slave_name = de->d_name;
|
|
|
|
/* read /sys/block/sda/device/wwid */
|
|
|
|
if (dm_snprintf(wwid_path, sizeof(wwid_path), "%sblock/%s/device/wwid",
|
|
dm_sysfs_dir(), slave_name) < 0) {
|
|
log_warn("Failed to create sysfs wwid path for %s", slave_name);
|
|
continue;
|
|
}
|
|
|
|
if (!get_sysfs_value(wwid_path, sysbuf, sizeof(sysbuf), 0))
|
|
stack;
|
|
|
|
if (!sysbuf[0])
|
|
continue;
|
|
|
|
if (strstr(sysbuf, "scsi_debug")) {
|
|
unsigned i;
|
|
for (i = 0; i < strlen(sysbuf); i++) {
|
|
if (sysbuf[i] == ' ')
|
|
sysbuf[i] = '_';
|
|
}
|
|
}
|
|
|
|
if ((wwid = dm_pool_strdup(cmd->mem, sysbuf)))
|
|
break;
|
|
}
|
|
if (closedir(dr))
|
|
log_sys_debug("closedir", slaves_path);
|
|
|
|
return wwid;
|
|
}
|