4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
25 * Copyright 2015 RackTop Systems.
26 * Copyright (c) 2016, Intel Corporation.
30 * Pool import support functions.
32 * To import a pool, we rely on reading the configuration information from the
33 * ZFS label of each device. If we successfully read the label, then we
34 * organize the configuration information in the following hierarchy:
36 * pool guid -> toplevel vdev guid -> label txg
38 * Duplicate entries matching this same tuple will be discarded. Once we have
39 * examined every device, we pick the best label txg config for each toplevel
40 * vdev. We then arrange these toplevel vdevs into a complete pool config, and
41 * update any paths that have changed. Finally, we attempt to import the pool
42 * using our derived config, and record the results.
62 #include <sys/dktp/fdisk.h>
63 #include <sys/efi_partition.h>
64 #include <thread_pool.h>
65 #include <sys/vdev_impl.h>
66 #include <blkid/blkid.h>
68 #include "libzfs_impl.h"
72 * Intermediate structures used to gather configuration information.
74 typedef struct config_entry {
77 struct config_entry *ce_next;
80 typedef struct vdev_entry {
82 config_entry_t *ve_configs;
83 struct vdev_entry *ve_next;
86 typedef struct pool_entry {
88 vdev_entry_t *pe_vdevs;
89 struct pool_entry *pe_next;
92 typedef struct name_entry {
96 uint64_t ne_num_labels;
97 struct name_entry *ne_next;
100 typedef struct pool_list {
105 #define DEV_BYID_PATH "/dev/disk/by-id/"
108 * Linux persistent device strings for vdev labels
110 * based on libudev for consistency with libudev disk add/remove events
114 typedef struct vdev_dev_strs {
116 char vds_devphys[128];
120 * Obtain the persistent device id string (describes what)
122 * used by ZED vdev matching for auto-{online,expand,replace}
125 zfs_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
127 struct udev_list_entry *entry;
129 char devbyid[MAXPATHLEN];
131 /* The bus based by-id path is preferred */
132 bus = udev_device_get_property_value(dev, "ID_BUS");
138 * For multipath nodes use the persistent uuid based identifier
140 * Example: /dev/disk/by-id/dm-uuid-mpath-35000c5006304de3f
142 dm_uuid = udev_device_get_property_value(dev, "DM_UUID");
143 if (dm_uuid != NULL) {
144 (void) snprintf(bufptr, buflen, "dm-uuid-%s", dm_uuid);
149 * NVME 'by-id' symlinks are similar to bus case
151 struct udev_device *parent;
153 parent = udev_device_get_parent_with_subsystem_devtype(dev,
156 bus = "nvme"; /* continue with bus symlink search */
162 * locate the bus specific by-id link
164 (void) snprintf(devbyid, sizeof (devbyid), "%s%s-", DEV_BYID_PATH, bus);
165 entry = udev_device_get_devlinks_list_entry(dev);
166 while (entry != NULL) {
169 name = udev_list_entry_get_name(entry);
170 if (strncmp(name, devbyid, strlen(devbyid)) == 0) {
171 name += strlen(DEV_BYID_PATH);
172 (void) strlcpy(bufptr, name, buflen);
175 entry = udev_list_entry_get_next(entry);
182 * Obtain the persistent physical location string (describes where)
184 * used by ZED vdev matching for auto-{online,expand,replace}
187 zfs_device_get_physical(struct udev_device *dev, char *bufptr, size_t buflen)
189 const char *physpath = NULL;
192 * Normal disks use ID_PATH for their physical path. Device mapper
193 * devices are virtual and don't have a physical path. For them we
194 * use ID_VDEV instead, which is setup via the /etc/vdev_id.conf file.
195 * ID_VDEV provides a persistent path to a virtual device. If you
196 * don't have vdev_id.conf setup, you cannot use multipath autoreplace.
198 if (!((physpath = udev_device_get_property_value(dev, "ID_PATH")) &&
201 udev_device_get_property_value(dev, "ID_VDEV")) &&
207 (void) strlcpy(bufptr, physpath, buflen);
213 udev_is_mpath(struct udev_device *dev)
215 return udev_device_get_property_value(dev, "DM_UUID") &&
216 udev_device_get_property_value(dev, "MPATH_SBIN_PATH");
220 * A disk is considered a multipath whole disk when:
221 * DEVNAME key value has "dm-"
222 * DM_NAME key value has "mpath" prefix
224 * ID_PART_TABLE_TYPE key does not exist or is not gpt
227 udev_mpath_whole_disk(struct udev_device *dev)
229 const char *devname, *type, *uuid;
231 devname = udev_device_get_property_value(dev, "DEVNAME");
232 type = udev_device_get_property_value(dev, "ID_PART_TABLE_TYPE");
233 uuid = udev_device_get_property_value(dev, "DM_UUID");
235 if ((devname != NULL && strncmp(devname, "/dev/dm-", 8) == 0) &&
236 ((type == NULL) || (strcmp(type, "gpt") != 0)) &&
245 * Check if a disk is effectively a multipath whole disk
248 is_mpath_whole_disk(const char *path)
251 struct udev_device *dev = NULL;
252 char nodepath[MAXPATHLEN];
254 boolean_t wholedisk = B_FALSE;
256 if (realpath(path, nodepath) == NULL)
258 sysname = strrchr(nodepath, '/') + 1;
259 if (strncmp(sysname, "dm-", 3) != 0)
261 if ((udev = udev_new()) == NULL)
263 if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
265 udev_device_unref(dev);
269 wholedisk = udev_mpath_whole_disk(dev);
271 udev_device_unref(dev);
276 udev_device_is_ready(struct udev_device *dev)
278 #ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED
279 return (udev_device_get_is_initialized(dev));
281 /* wait for DEVLINKS property to be initialized */
282 return (udev_device_get_property_value(dev, "DEVLINKS") != NULL);
287 * Wait up to timeout_ms for udev to set up the device node. The device is
288 * considered ready when libudev determines it has been initialized, all of
289 * the device links have been verified to exist, and it has been allowed to
290 * settle. At this point the device the device can be accessed reliably.
291 * Depending on the complexity of the udev rules this process could take
295 zpool_label_disk_wait(char *path, int timeout_ms)
298 struct udev_device *dev = NULL;
299 char nodepath[MAXPATHLEN];
300 char *sysname = NULL;
304 hrtime_t start, settle;
306 if ((udev = udev_new()) == NULL)
313 if (sysname == NULL) {
314 if (realpath(path, nodepath) != NULL) {
315 sysname = strrchr(nodepath, '/') + 1;
317 (void) usleep(sleep_ms * MILLISEC);
322 dev = udev_device_new_from_subsystem_sysname(udev,
324 if ((dev != NULL) && udev_device_is_ready(dev)) {
325 struct udev_list_entry *links, *link = NULL;
328 links = udev_device_get_devlinks_list_entry(dev);
330 udev_list_entry_foreach(link, links) {
331 struct stat64 statbuf;
334 name = udev_list_entry_get_name(link);
336 if (stat64(name, &statbuf) == 0 && errno == 0)
346 settle = gethrtime();
347 } else if (NSEC2MSEC(gethrtime() - settle) >=
349 udev_device_unref(dev);
355 udev_device_unref(dev);
356 (void) usleep(sleep_ms * MILLISEC);
358 } while (NSEC2MSEC(gethrtime() - start) < timeout_ms);
367 * Encode the persistent devices strings
368 * used for the vdev disk label
371 encode_device_strings(const char *path, vdev_dev_strs_t *ds,
375 struct udev_device *dev = NULL;
376 char nodepath[MAXPATHLEN];
381 if ((udev = udev_new()) == NULL)
384 /* resolve path to a runtime device node instance */
385 if (realpath(path, nodepath) == NULL)
388 sysname = strrchr(nodepath, '/') + 1;
391 * Wait up to 3 seconds for udev to set up the device node context
395 dev = udev_device_new_from_subsystem_sysname(udev, "block",
399 if (udev_device_is_ready(dev))
400 break; /* udev ready */
402 udev_device_unref(dev);
405 if (NSEC2MSEC(gethrtime() - start) < 10)
406 (void) sched_yield(); /* yield/busy wait up to 10ms */
408 (void) usleep(10 * MILLISEC);
410 } while (NSEC2MSEC(gethrtime() - start) < (3 * MILLISEC));
416 * Only whole disks require extra device strings
418 if (!wholedisk && !udev_mpath_whole_disk(dev))
421 ret = zfs_device_get_devid(dev, ds->vds_devid, sizeof (ds->vds_devid));
425 /* physical location string (optional) */
426 if (zfs_device_get_physical(dev, ds->vds_devphys,
427 sizeof (ds->vds_devphys)) != 0) {
428 ds->vds_devphys[0] = '\0'; /* empty string --> not available */
432 udev_device_unref(dev);
440 * Update a leaf vdev's persistent device strings (Linux only)
442 * - only applies for a dedicated leaf vdev (aka whole disk)
443 * - updated during pool create|add|attach|import
444 * - used for matching device matching during auto-{online,expand,replace}
445 * - stored in a leaf disk config label (i.e. alongside 'path' NVP)
446 * - these strings are currently not used in kernel (i.e. for vdev_disk_open)
448 * single device node example:
449 * devid: 'scsi-MG03SCA300_350000494a8cb3d67-part1'
450 * phys_path: 'pci-0000:04:00.0-sas-0x50000394a8cb3d67-lun-0'
452 * multipath device node example:
453 * devid: 'dm-uuid-mpath-35000c5006304de3f'
455 * We also store the enclosure sysfs path for turning on enclosure LEDs
457 * vdev_enc_sysfs_path: '/sys/class/enclosure/11:0:1:0/SLOT 4'
460 update_vdev_config_dev_strs(nvlist_t *nv)
463 char *env, *type, *path;
464 uint64_t wholedisk = 0;
468 * For the benefit of legacy ZFS implementations, allow
469 * for opting out of devid strings in the vdev label.
472 * env ZFS_VDEV_DEVID_OPT_OUT=YES zpool import dozer
475 * Older ZFS on Linux implementations had issues when attempting to
476 * display pool config VDEV names if a "devid" NVP value is present
477 * in the pool's config.
479 * For example, a pool that originated on illumos platform would
480 * have a devid value in the config and "zpool status" would fail
481 * when listing the config.
483 * A pool can be stripped of any "devid" values on import or
484 * prevented from adding them on zpool create|add by setting
485 * ZFS_VDEV_DEVID_OPT_OUT.
487 env = getenv("ZFS_VDEV_DEVID_OPT_OUT");
488 if (env && (strtoul(env, NULL, 0) > 0 ||
489 !strncasecmp(env, "YES", 3) || !strncasecmp(env, "ON", 2))) {
490 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID);
491 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_PHYS_PATH);
495 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0 ||
496 strcmp(type, VDEV_TYPE_DISK) != 0) {
499 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0)
501 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, &wholedisk);
504 * Update device string values in config nvlist
506 if (encode_device_strings(path, &vds, (boolean_t)wholedisk) == 0) {
507 (void) nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, vds.vds_devid);
508 if (vds.vds_devphys[0] != '\0') {
509 (void) nvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH,
513 /* Add enclosure sysfs path (if disk is in an enclosure) */
514 upath = zfs_get_underlying_path(path);
515 spath = zfs_get_enclosure_sysfs_path(upath);
517 nvlist_add_string(nv, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH,
520 nvlist_remove_all(nv, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH);
525 /* clear out any stale entries */
526 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID);
527 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_PHYS_PATH);
528 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH);
534 is_mpath_whole_disk(const char *path)
540 * Wait up to timeout_ms for udev to set up the device node. The device is
541 * considered ready when the provided path have been verified to exist and
542 * it has been allowed to settle. At this point the device the device can
543 * be accessed reliably. Depending on the complexity of the udev rules thisi
544 * process could take several seconds.
547 zpool_label_disk_wait(char *path, int timeout_ms)
551 hrtime_t start, settle;
552 struct stat64 statbuf;
559 if ((stat64(path, &statbuf) == 0) && (errno == 0)) {
561 settle = gethrtime();
562 else if (NSEC2MSEC(gethrtime() - settle) >= settle_ms)
564 } else if (errno != ENOENT) {
568 usleep(sleep_ms * MILLISEC);
569 } while (NSEC2MSEC(gethrtime() - start) < timeout_ms);
575 update_vdev_config_dev_strs(nvlist_t *nv)
579 #endif /* HAVE_LIBUDEV */
582 * Go through and fix up any path and/or devid information for the given vdev
586 fix_paths(nvlist_t *nv, name_entry_t *names)
591 name_entry_t *ne, *best;
594 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
595 &child, &children) == 0) {
596 for (c = 0; c < children; c++)
597 if (fix_paths(child[c], names) != 0)
603 * This is a leaf (file or disk) vdev. In either case, go through
604 * the name list and see if we find a matching guid. If so, replace
605 * the path and see if we can calculate a new devid.
607 * There may be multiple names associated with a particular guid, in
608 * which case we have overlapping partitions or multiple paths to the
609 * same disk. In this case we prefer to use the path name which
610 * matches the ZPOOL_CONFIG_PATH. If no matching entry is found we
611 * use the lowest order device which corresponds to the first match
612 * while traversing the ZPOOL_IMPORT_PATH search path.
614 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0);
615 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0)
619 for (ne = names; ne != NULL; ne = ne->ne_next) {
620 if (ne->ne_guid == guid) {
626 if ((strlen(path) == strlen(ne->ne_name)) &&
627 strncmp(path, ne->ne_name, strlen(path)) == 0) {
637 /* Prefer paths with move vdev labels. */
638 if (ne->ne_num_labels > best->ne_num_labels) {
643 /* Prefer paths earlier in the search order. */
644 if (ne->ne_num_labels == best->ne_num_labels &&
645 ne->ne_order < best->ne_order) {
655 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0)
658 /* Linux only - update ZPOOL_CONFIG_DEVID and ZPOOL_CONFIG_PHYS_PATH */
659 update_vdev_config_dev_strs(nv);
665 * Add the given configuration to the list of known devices.
668 add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path,
669 int order, int num_labels, nvlist_t *config)
671 uint64_t pool_guid, vdev_guid, top_guid, txg, state;
678 * If this is a hot spare not currently in use or level 2 cache
679 * device, add it to the list of names to translate, but don't do
682 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
684 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) &&
685 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) {
686 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) {
691 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) {
696 ne->ne_guid = vdev_guid;
697 ne->ne_order = order;
698 ne->ne_num_labels = num_labels;
699 ne->ne_next = pl->names;
706 * If we have a valid config but cannot read any of these fields, then
707 * it means we have a half-initialized label. In vdev_label_init()
708 * we write a label with txg == 0 so that we can identify the device
709 * in case the user refers to the same disk later on. If we fail to
710 * create the pool, we'll be left with a label in this state
711 * which should not be considered part of a valid pool.
713 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
715 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
717 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID,
719 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
720 &txg) != 0 || txg == 0) {
726 * First, see if we know about this pool. If not, then add it to the
727 * list of known pools.
729 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) {
730 if (pe->pe_guid == pool_guid)
735 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) {
739 pe->pe_guid = pool_guid;
740 pe->pe_next = pl->pools;
745 * Second, see if we know about this toplevel vdev. Add it if its
748 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) {
749 if (ve->ve_guid == top_guid)
754 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) {
758 ve->ve_guid = top_guid;
759 ve->ve_next = pe->pe_vdevs;
764 * Third, see if we have a config with a matching transaction group. If
765 * so, then we do nothing. Otherwise, add it to the list of known
768 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) {
769 if (ce->ce_txg == txg)
774 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) {
779 ce->ce_config = config;
780 ce->ce_next = ve->ve_configs;
787 * At this point we've successfully added our config to the list of
788 * known configs. The last thing to do is add the vdev guid -> path
789 * mappings so that we can fix up the configuration as necessary before
792 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL)
795 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) {
800 ne->ne_guid = vdev_guid;
801 ne->ne_order = order;
802 ne->ne_num_labels = num_labels;
803 ne->ne_next = pl->names;
810 * Returns true if the named pool matches the given GUID.
813 pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid,
819 if (zpool_open_silent(hdl, name, &zhp) != 0)
827 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID,
832 *isactive = (theguid == guid);
837 refresh_config(libzfs_handle_t *hdl, nvlist_t *config)
840 zfs_cmd_t zc = {"\0"};
841 int err, dstbuf_size;
843 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0)
846 dstbuf_size = MAX(CONFIG_BUF_MINSIZE, zc.zc_nvlist_conf_size * 4);
848 if (zcmd_alloc_dst_nvlist(hdl, &zc, dstbuf_size) != 0) {
849 zcmd_free_nvlists(&zc);
853 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT,
854 &zc)) != 0 && errno == ENOMEM) {
855 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
856 zcmd_free_nvlists(&zc);
862 zcmd_free_nvlists(&zc);
866 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) {
867 zcmd_free_nvlists(&zc);
871 zcmd_free_nvlists(&zc);
876 * Determine if the vdev id is a hole in the namespace.
879 vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id)
883 for (c = 0; c < holes; c++) {
885 /* Top-level is a hole */
886 if (hole_array[c] == id)
893 * Convert our list of pools into the definitive set of configurations. We
894 * start by picking the best config for each toplevel vdev. Once that's done,
895 * we assemble the toplevel vdevs into a full config for the pool. We make a
896 * pass to fix up any incorrect paths, and then add it to the main list to
897 * return to the user.
900 get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok,
906 nvlist_t *ret = NULL, *config = NULL, *tmp = NULL, *nvtop, *nvroot;
907 nvlist_t **spares, **l2cache;
908 uint_t i, nspares, nl2cache;
909 boolean_t config_seen;
911 char *name, *hostname = NULL;
914 nvlist_t **child = NULL;
916 uint64_t *hole_array, max_id;
921 boolean_t valid_top_config = B_FALSE;
923 if (nvlist_alloc(&ret, 0, 0) != 0)
926 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) {
927 uint64_t id, max_txg = 0;
929 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0)
931 config_seen = B_FALSE;
934 * Iterate over all toplevel vdevs. Grab the pool configuration
935 * from the first one we find, and then go through the rest and
936 * add them as necessary to the 'vdevs' member of the config.
938 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) {
941 * Determine the best configuration for this vdev by
942 * selecting the config with the latest transaction
946 for (ce = ve->ve_configs; ce != NULL;
949 if (ce->ce_txg > best_txg) {
951 best_txg = ce->ce_txg;
956 * We rely on the fact that the max txg for the
957 * pool will contain the most up-to-date information
958 * about the valid top-levels in the vdev namespace.
960 if (best_txg > max_txg) {
961 (void) nvlist_remove(config,
962 ZPOOL_CONFIG_VDEV_CHILDREN,
964 (void) nvlist_remove(config,
965 ZPOOL_CONFIG_HOLE_ARRAY,
966 DATA_TYPE_UINT64_ARRAY);
972 valid_top_config = B_FALSE;
974 if (nvlist_lookup_uint64(tmp,
975 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) {
976 verify(nvlist_add_uint64(config,
977 ZPOOL_CONFIG_VDEV_CHILDREN,
979 valid_top_config = B_TRUE;
982 if (nvlist_lookup_uint64_array(tmp,
983 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array,
985 verify(nvlist_add_uint64_array(config,
986 ZPOOL_CONFIG_HOLE_ARRAY,
987 hole_array, holes) == 0);
993 * Copy the relevant pieces of data to the pool
999 * comment (if available)
1001 * hostid (if available)
1002 * hostname (if available)
1004 uint64_t state, version;
1005 char *comment = NULL;
1007 version = fnvlist_lookup_uint64(tmp,
1008 ZPOOL_CONFIG_VERSION);
1009 fnvlist_add_uint64(config,
1010 ZPOOL_CONFIG_VERSION, version);
1011 guid = fnvlist_lookup_uint64(tmp,
1012 ZPOOL_CONFIG_POOL_GUID);
1013 fnvlist_add_uint64(config,
1014 ZPOOL_CONFIG_POOL_GUID, guid);
1015 name = fnvlist_lookup_string(tmp,
1016 ZPOOL_CONFIG_POOL_NAME);
1017 fnvlist_add_string(config,
1018 ZPOOL_CONFIG_POOL_NAME, name);
1020 if (nvlist_lookup_string(tmp,
1021 ZPOOL_CONFIG_COMMENT, &comment) == 0)
1022 fnvlist_add_string(config,
1023 ZPOOL_CONFIG_COMMENT, comment);
1025 state = fnvlist_lookup_uint64(tmp,
1026 ZPOOL_CONFIG_POOL_STATE);
1027 fnvlist_add_uint64(config,
1028 ZPOOL_CONFIG_POOL_STATE, state);
1031 if (nvlist_lookup_uint64(tmp,
1032 ZPOOL_CONFIG_HOSTID, &hostid) == 0) {
1033 fnvlist_add_uint64(config,
1034 ZPOOL_CONFIG_HOSTID, hostid);
1035 hostname = fnvlist_lookup_string(tmp,
1036 ZPOOL_CONFIG_HOSTNAME);
1037 fnvlist_add_string(config,
1038 ZPOOL_CONFIG_HOSTNAME, hostname);
1041 config_seen = B_TRUE;
1045 * Add this top-level vdev to the child array.
1047 verify(nvlist_lookup_nvlist(tmp,
1048 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0);
1049 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID,
1052 if (id >= children) {
1053 nvlist_t **newchild;
1055 newchild = zfs_alloc(hdl, (id + 1) *
1056 sizeof (nvlist_t *));
1057 if (newchild == NULL)
1060 for (c = 0; c < children; c++)
1061 newchild[c] = child[c];
1067 if (nvlist_dup(nvtop, &child[id], 0) != 0)
1073 * If we have information about all the top-levels then
1074 * clean up the nvlist which we've constructed. This
1075 * means removing any extraneous devices that are
1076 * beyond the valid range or adding devices to the end
1077 * of our array which appear to be missing.
1079 if (valid_top_config) {
1080 if (max_id < children) {
1081 for (c = max_id; c < children; c++)
1082 nvlist_free(child[c]);
1084 } else if (max_id > children) {
1085 nvlist_t **newchild;
1087 newchild = zfs_alloc(hdl, (max_id) *
1088 sizeof (nvlist_t *));
1089 if (newchild == NULL)
1092 for (c = 0; c < children; c++)
1093 newchild[c] = child[c];
1101 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
1105 * The vdev namespace may contain holes as a result of
1106 * device removal. We must add them back into the vdev
1107 * tree before we process any missing devices.
1110 ASSERT(valid_top_config);
1112 for (c = 0; c < children; c++) {
1115 if (child[c] != NULL ||
1116 !vdev_is_hole(hole_array, holes, c))
1119 if (nvlist_alloc(&holey, NV_UNIQUE_NAME,
1124 * Holes in the namespace are treated as
1125 * "hole" top-level vdevs and have a
1126 * special flag set on them.
1128 if (nvlist_add_string(holey,
1130 VDEV_TYPE_HOLE) != 0 ||
1131 nvlist_add_uint64(holey,
1132 ZPOOL_CONFIG_ID, c) != 0 ||
1133 nvlist_add_uint64(holey,
1134 ZPOOL_CONFIG_GUID, 0ULL) != 0) {
1143 * Look for any missing top-level vdevs. If this is the case,
1144 * create a faked up 'missing' vdev as a placeholder. We cannot
1145 * simply compress the child array, because the kernel performs
1146 * certain checks to make sure the vdev IDs match their location
1147 * in the configuration.
1149 for (c = 0; c < children; c++) {
1150 if (child[c] == NULL) {
1152 if (nvlist_alloc(&missing, NV_UNIQUE_NAME,
1155 if (nvlist_add_string(missing,
1157 VDEV_TYPE_MISSING) != 0 ||
1158 nvlist_add_uint64(missing,
1159 ZPOOL_CONFIG_ID, c) != 0 ||
1160 nvlist_add_uint64(missing,
1161 ZPOOL_CONFIG_GUID, 0ULL) != 0) {
1162 nvlist_free(missing);
1170 * Put all of this pool's top-level vdevs into a root vdev.
1172 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0)
1174 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
1175 VDEV_TYPE_ROOT) != 0 ||
1176 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 ||
1177 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 ||
1178 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
1179 child, children) != 0) {
1180 nvlist_free(nvroot);
1184 for (c = 0; c < children; c++)
1185 nvlist_free(child[c]);
1191 * Go through and fix up any paths and/or devids based on our
1192 * known list of vdev GUID -> path mappings.
1194 if (fix_paths(nvroot, pl->names) != 0) {
1195 nvlist_free(nvroot);
1200 * Add the root vdev to this pool's configuration.
1202 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
1204 nvlist_free(nvroot);
1207 nvlist_free(nvroot);
1210 * zdb uses this path to report on active pools that were
1211 * imported or created using -R.
1217 * Determine if this pool is currently active, in which case we
1218 * can't actually import it.
1220 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
1222 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
1225 if (pool_active(hdl, name, guid, &isactive) != 0)
1229 nvlist_free(config);
1234 if (policy != NULL) {
1235 if (nvlist_add_nvlist(config, ZPOOL_LOAD_POLICY,
1240 if ((nvl = refresh_config(hdl, config)) == NULL) {
1241 nvlist_free(config);
1246 nvlist_free(config);
1250 * Go through and update the paths for spares, now that we have
1253 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
1255 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1256 &spares, &nspares) == 0) {
1257 for (i = 0; i < nspares; i++) {
1258 if (fix_paths(spares[i], pl->names) != 0)
1264 * Update the paths for l2cache devices.
1266 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
1267 &l2cache, &nl2cache) == 0) {
1268 for (i = 0; i < nl2cache; i++) {
1269 if (fix_paths(l2cache[i], pl->names) != 0)
1275 * Restore the original information read from the actual label.
1277 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID,
1279 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME,
1282 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID,
1284 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME,
1290 * Add this pool to the list of configs.
1292 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
1294 if (nvlist_add_nvlist(ret, name, config) != 0)
1297 nvlist_free(config);
1304 (void) no_memory(hdl);
1306 nvlist_free(config);
1308 for (c = 0; c < children; c++)
1309 nvlist_free(child[c]);
1316 * Return the offset of the given label.
1319 label_offset(uint64_t size, int l)
1321 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0);
1322 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ?
1323 0 : size - VDEV_LABELS * sizeof (vdev_label_t)));
1327 * Given a file descriptor, read the label information and return an nvlist
1328 * describing the configuration, if there is one. The number of valid
1329 * labels found will be returned in num_labels when non-NULL.
1332 zpool_read_label(int fd, nvlist_t **config, int *num_labels)
1334 struct stat64 statbuf;
1336 vdev_label_t *label;
1337 nvlist_t *expected_config = NULL;
1338 uint64_t expected_guid = 0, size;
1343 if (fstat64_blk(fd, &statbuf) == -1)
1345 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
1347 error = posix_memalign((void **)&label, PAGESIZE, sizeof (*label));
1351 for (l = 0; l < VDEV_LABELS; l++) {
1352 uint64_t state, guid, txg;
1354 if (pread64(fd, label, sizeof (vdev_label_t),
1355 label_offset(size, l)) != sizeof (vdev_label_t))
1358 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
1359 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0)
1362 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_GUID,
1363 &guid) != 0 || guid == 0) {
1364 nvlist_free(*config);
1368 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
1369 &state) != 0 || state > POOL_STATE_L2CACHE) {
1370 nvlist_free(*config);
1374 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE &&
1375 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
1376 &txg) != 0 || txg == 0)) {
1377 nvlist_free(*config);
1381 if (expected_guid) {
1382 if (expected_guid == guid)
1385 nvlist_free(*config);
1387 expected_config = *config;
1388 expected_guid = guid;
1393 if (num_labels != NULL)
1394 *num_labels = count;
1397 *config = expected_config;
1402 typedef struct rdsk_node {
1403 char *rn_name; /* Full path to device */
1404 int rn_order; /* Preferred order (low to high) */
1405 int rn_num_labels; /* Number of valid labels */
1406 uint64_t rn_vdev_guid; /* Expected vdev guid when set */
1407 libzfs_handle_t *rn_hdl;
1408 nvlist_t *rn_config; /* Label config */
1411 pthread_mutex_t *rn_lock;
1412 boolean_t rn_labelpaths;
1416 * Sorted by vdev guid and full path to allow for multiple entries with
1417 * the same full path name. This is required because it's possible to
1418 * have multiple block devices with labels that refer to the same
1419 * ZPOOL_CONFIG_PATH yet have different vdev guids. In this case both
1420 * entries need to be added to the cache. Scenarios where this can occur
1421 * include overwritten pool labels, devices which are visible from multiple
1422 * hosts and multipath devices.
1425 slice_cache_compare(const void *arg1, const void *arg2)
1427 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name;
1428 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name;
1429 uint64_t guid1 = ((rdsk_node_t *)arg1)->rn_vdev_guid;
1430 uint64_t guid2 = ((rdsk_node_t *)arg2)->rn_vdev_guid;
1433 rv = AVL_CMP(guid1, guid2);
1437 return (AVL_ISIGN(strcmp(nm1, nm2)));
1441 is_watchdog_dev(char *dev)
1443 /* For 'watchdog' dev */
1444 if (strcmp(dev, "watchdog") == 0)
1447 /* For 'watchdog<digit><whatever> */
1448 if (strstr(dev, "watchdog") == dev && isdigit(dev[8]))
1455 label_paths_impl(libzfs_handle_t *hdl, nvlist_t *nvroot, uint64_t pool_guid,
1456 uint64_t vdev_guid, char **path, char **devid)
1464 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
1465 &child, &children) == 0) {
1466 for (c = 0; c < children; c++) {
1467 error = label_paths_impl(hdl, child[c],
1468 pool_guid, vdev_guid, path, devid);
1478 error = nvlist_lookup_uint64(nvroot, ZPOOL_CONFIG_GUID, &guid);
1479 if ((error != 0) || (guid != vdev_guid))
1482 error = nvlist_lookup_string(nvroot, ZPOOL_CONFIG_PATH, &val);
1486 error = nvlist_lookup_string(nvroot, ZPOOL_CONFIG_DEVID, &val);
1494 * Given a disk label fetch the ZPOOL_CONFIG_PATH and ZPOOL_CONFIG_DEVID
1495 * and store these strings as config_path and devid_path respectively.
1496 * The returned pointers are only valid as long as label remains valid.
1499 label_paths(libzfs_handle_t *hdl, nvlist_t *label, char **path, char **devid)
1508 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvroot) ||
1509 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, &pool_guid) ||
1510 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &vdev_guid))
1513 return (label_paths_impl(hdl, nvroot, pool_guid, vdev_guid, path,
1518 zpool_open_func(void *arg)
1520 rdsk_node_t *rn = arg;
1521 libzfs_handle_t *hdl = rn->rn_hdl;
1522 struct stat64 statbuf;
1524 char *bname, *dupname;
1525 uint64_t vdev_guid = 0;
1531 * Skip devices with well known prefixes there can be side effects
1532 * when opening devices which need to be avoided.
1534 * hpet - High Precision Event Timer
1535 * watchdog - Watchdog must be closed in a special way.
1537 dupname = zfs_strdup(hdl, rn->rn_name);
1538 bname = basename(dupname);
1539 error = ((strcmp(bname, "hpet") == 0) || is_watchdog_dev(bname));
1545 * Ignore failed stats. We only want regular files and block devices.
1547 if (stat64(rn->rn_name, &statbuf) != 0 ||
1548 (!S_ISREG(statbuf.st_mode) && !S_ISBLK(statbuf.st_mode)))
1552 * Preferentially open using O_DIRECT to bypass the block device
1553 * cache which may be stale for multipath devices. An EINVAL errno
1554 * indicates O_DIRECT is unsupported so fallback to just O_RDONLY.
1556 fd = open(rn->rn_name, O_RDONLY | O_DIRECT);
1557 if ((fd < 0) && (errno == EINVAL))
1558 fd = open(rn->rn_name, O_RDONLY);
1564 * This file is too small to hold a zpool
1566 if (S_ISREG(statbuf.st_mode) && statbuf.st_size < SPA_MINDEVSIZE) {
1571 error = zpool_read_label(fd, &config, &num_labels);
1577 if (num_labels == 0) {
1579 nvlist_free(config);
1584 * Check that the vdev is for the expected guid. Additional entries
1585 * are speculatively added based on the paths stored in the labels.
1586 * Entries with valid paths but incorrect guids must be removed.
1588 error = nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid);
1589 if (error || (rn->rn_vdev_guid && rn->rn_vdev_guid != vdev_guid)) {
1591 nvlist_free(config);
1597 rn->rn_config = config;
1598 rn->rn_num_labels = num_labels;
1601 * Add additional entries for paths described by this label.
1603 if (rn->rn_labelpaths) {
1610 if (label_paths(rn->rn_hdl, rn->rn_config, &path, &devid))
1614 * Allow devlinks to stabilize so all paths are available.
1616 zpool_label_disk_wait(rn->rn_name, DISK_LABEL_WAIT);
1619 slice = zfs_alloc(hdl, sizeof (rdsk_node_t));
1620 slice->rn_name = zfs_strdup(hdl, path);
1621 slice->rn_vdev_guid = vdev_guid;
1622 slice->rn_avl = rn->rn_avl;
1623 slice->rn_hdl = hdl;
1624 slice->rn_order = IMPORT_ORDER_PREFERRED_1;
1625 slice->rn_labelpaths = B_FALSE;
1626 pthread_mutex_lock(rn->rn_lock);
1627 if (avl_find(rn->rn_avl, slice, &where)) {
1628 pthread_mutex_unlock(rn->rn_lock);
1629 free(slice->rn_name);
1632 avl_insert(rn->rn_avl, slice, where);
1633 pthread_mutex_unlock(rn->rn_lock);
1634 zpool_open_func(slice);
1638 if (devid != NULL) {
1639 slice = zfs_alloc(hdl, sizeof (rdsk_node_t));
1640 error = asprintf(&slice->rn_name, "%s%s",
1641 DEV_BYID_PATH, devid);
1647 slice->rn_vdev_guid = vdev_guid;
1648 slice->rn_avl = rn->rn_avl;
1649 slice->rn_hdl = hdl;
1650 slice->rn_order = IMPORT_ORDER_PREFERRED_2;
1651 slice->rn_labelpaths = B_FALSE;
1652 pthread_mutex_lock(rn->rn_lock);
1653 if (avl_find(rn->rn_avl, slice, &where)) {
1654 pthread_mutex_unlock(rn->rn_lock);
1655 free(slice->rn_name);
1658 avl_insert(rn->rn_avl, slice, where);
1659 pthread_mutex_unlock(rn->rn_lock);
1660 zpool_open_func(slice);
1667 * Given a file descriptor, clear (zero) the label information. This function
1668 * is used in the appliance stack as part of the ZFS sysevent module and
1669 * to implement the "zpool labelclear" command.
1672 zpool_clear_label(int fd)
1674 struct stat64 statbuf;
1676 vdev_label_t *label;
1679 if (fstat64_blk(fd, &statbuf) == -1)
1681 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
1683 if ((label = calloc(1, sizeof (vdev_label_t))) == NULL)
1686 for (l = 0; l < VDEV_LABELS; l++) {
1687 if (pwrite64(fd, label, sizeof (vdev_label_t),
1688 label_offset(size, l)) != sizeof (vdev_label_t)) {
1699 zpool_find_import_scan_add_slice(libzfs_handle_t *hdl, pthread_mutex_t *lock,
1700 avl_tree_t *cache, char *path, const char *name, int order)
1705 slice = zfs_alloc(hdl, sizeof (rdsk_node_t));
1706 if (asprintf(&slice->rn_name, "%s/%s", path, name) == -1) {
1710 slice->rn_vdev_guid = 0;
1711 slice->rn_lock = lock;
1712 slice->rn_avl = cache;
1713 slice->rn_hdl = hdl;
1714 slice->rn_order = order + IMPORT_ORDER_SCAN_OFFSET;
1715 slice->rn_labelpaths = B_FALSE;
1717 pthread_mutex_lock(lock);
1718 if (avl_find(cache, slice, &where)) {
1719 free(slice->rn_name);
1722 avl_insert(cache, slice, where);
1724 pthread_mutex_unlock(lock);
1728 zpool_find_import_scan_dir(libzfs_handle_t *hdl, pthread_mutex_t *lock,
1729 avl_tree_t *cache, char *dir, int order)
1732 char path[MAXPATHLEN];
1733 struct dirent64 *dp;
1736 if (realpath(dir, path) == NULL) {
1738 if (error == ENOENT)
1741 zfs_error_aux(hdl, strerror(error));
1742 (void) zfs_error_fmt(hdl, EZFS_BADPATH, dgettext(
1743 TEXT_DOMAIN, "cannot resolve path '%s'"), dir);
1747 dirp = opendir(path);
1750 zfs_error_aux(hdl, strerror(error));
1751 (void) zfs_error_fmt(hdl, EZFS_BADPATH,
1752 dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);
1756 while ((dp = readdir64(dirp)) != NULL) {
1757 const char *name = dp->d_name;
1758 if (name[0] == '.' &&
1759 (name[1] == 0 || (name[1] == '.' && name[2] == 0)))
1762 zpool_find_import_scan_add_slice(hdl, lock, cache, path, name,
1766 (void) closedir(dirp);
1771 zpool_find_import_scan_path(libzfs_handle_t *hdl, pthread_mutex_t *lock,
1772 avl_tree_t *cache, char *dir, int order)
1775 char path[MAXPATHLEN];
1780 * Seperate the directory part and last part of the
1781 * path. We do this so that we can get the realpath of
1782 * the directory. We don't get the realpath on the
1783 * whole path because if it's a symlink, we want the
1784 * path of the symlink not where it points to.
1786 d = zfs_strdup(hdl, dir);
1787 b = zfs_strdup(hdl, dir);
1791 if (realpath(dpath, path) == NULL) {
1793 if (error == ENOENT) {
1798 zfs_error_aux(hdl, strerror(error));
1799 (void) zfs_error_fmt(hdl, EZFS_BADPATH, dgettext(
1800 TEXT_DOMAIN, "cannot resolve path '%s'"), dir);
1804 zpool_find_import_scan_add_slice(hdl, lock, cache, path, name, order);
1813 * Scan a list of directories for zfs devices.
1816 zpool_find_import_scan(libzfs_handle_t *hdl, pthread_mutex_t *lock,
1817 avl_tree_t **slice_cache, char **dir, int dirs)
1824 *slice_cache = NULL;
1825 cache = zfs_alloc(hdl, sizeof (avl_tree_t));
1826 avl_create(cache, slice_cache_compare, sizeof (rdsk_node_t),
1827 offsetof(rdsk_node_t, rn_node));
1829 for (i = 0; i < dirs; i++) {
1832 if (stat(dir[i], &sbuf) != 0) {
1834 if (error == ENOENT)
1837 zfs_error_aux(hdl, strerror(error));
1838 (void) zfs_error_fmt(hdl, EZFS_BADPATH, dgettext(
1839 TEXT_DOMAIN, "cannot resolve path '%s'"), dir[i]);
1844 * If dir[i] is a directory, we walk through it and add all
1845 * the entry to the cache. If it's not a directory, we just
1846 * add it to the cache.
1848 if (S_ISDIR(sbuf.st_mode)) {
1849 if ((error = zpool_find_import_scan_dir(hdl, lock,
1850 cache, dir[i], i)) != 0)
1853 if ((error = zpool_find_import_scan_path(hdl, lock,
1854 cache, dir[i], i)) != 0)
1859 *slice_cache = cache;
1864 while ((slice = avl_destroy_nodes(cache, &cookie)) != NULL) {
1865 free(slice->rn_name);
1874 * Use libblkid to quickly enumerate all known zfs devices.
1877 zpool_find_import_blkid(libzfs_handle_t *hdl, pthread_mutex_t *lock,
1878 avl_tree_t **slice_cache)
1882 blkid_dev_iterate iter;
1887 *slice_cache = NULL;
1889 error = blkid_get_cache(&cache, NULL);
1893 error = blkid_probe_all_new(cache);
1895 blkid_put_cache(cache);
1899 iter = blkid_dev_iterate_begin(cache);
1901 blkid_put_cache(cache);
1905 error = blkid_dev_set_search(iter, "TYPE", "zfs_member");
1907 blkid_dev_iterate_end(iter);
1908 blkid_put_cache(cache);
1912 *slice_cache = zfs_alloc(hdl, sizeof (avl_tree_t));
1913 avl_create(*slice_cache, slice_cache_compare, sizeof (rdsk_node_t),
1914 offsetof(rdsk_node_t, rn_node));
1916 while (blkid_dev_next(iter, &dev) == 0) {
1917 slice = zfs_alloc(hdl, sizeof (rdsk_node_t));
1918 slice->rn_name = zfs_strdup(hdl, blkid_dev_devname(dev));
1919 slice->rn_vdev_guid = 0;
1920 slice->rn_lock = lock;
1921 slice->rn_avl = *slice_cache;
1922 slice->rn_hdl = hdl;
1923 slice->rn_labelpaths = B_TRUE;
1925 error = zfs_path_order(slice->rn_name, &slice->rn_order);
1927 slice->rn_order += IMPORT_ORDER_SCAN_OFFSET;
1929 slice->rn_order = IMPORT_ORDER_DEFAULT;
1931 pthread_mutex_lock(lock);
1932 if (avl_find(*slice_cache, slice, &where)) {
1933 free(slice->rn_name);
1936 avl_insert(*slice_cache, slice, where);
1938 pthread_mutex_unlock(lock);
1941 blkid_dev_iterate_end(iter);
1942 blkid_put_cache(cache);
1948 zpool_default_import_path[DEFAULT_IMPORT_PATH_SIZE] = {
1949 "/dev/disk/by-vdev", /* Custom rules, use first if they exist */
1950 "/dev/mapper", /* Use multipath devices before components */
1951 "/dev/disk/by-partlabel", /* Single unique entry set by user */
1952 "/dev/disk/by-partuuid", /* Generated partition uuid */
1953 "/dev/disk/by-label", /* Custom persistent labels */
1954 "/dev/disk/by-uuid", /* Single unique entry and persistent */
1955 "/dev/disk/by-id", /* May be multiple entries and persistent */
1956 "/dev/disk/by-path", /* Encodes physical location and persistent */
1957 "/dev" /* UNSAFE device names will change */
1961 * Given a list of directories to search, find all pools stored on disk. This
1962 * includes partial pools which are not available to import. If no args are
1963 * given (argc is 0), then the default directory (/dev/dsk) is searched.
1964 * poolname or guid (but not both) are provided by the caller when trying
1965 * to import a specific pool.
1968 zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg)
1970 nvlist_t *ret = NULL;
1971 pool_list_t pools = { 0 };
1972 pool_entry_t *pe, *penext;
1973 vdev_entry_t *ve, *venext;
1974 config_entry_t *ce, *cenext;
1975 name_entry_t *ne, *nenext;
1976 pthread_mutex_t lock;
1982 verify(iarg->poolname == NULL || iarg->guid == 0);
1983 pthread_mutex_init(&lock, NULL);
1986 * Locate pool member vdevs using libblkid or by directory scanning.
1987 * On success a newly allocated AVL tree which is populated with an
1988 * entry for each discovered vdev will be returned as the cache.
1989 * It's the callers responsibility to consume and destroy this tree.
1991 if (iarg->scan || iarg->paths != 0) {
1992 int dirs = iarg->paths;
1993 char **dir = iarg->path;
1996 dir = zpool_default_import_path;
1997 dirs = DEFAULT_IMPORT_PATH_SIZE;
2000 if (zpool_find_import_scan(hdl, &lock, &cache, dir, dirs) != 0)
2003 if (zpool_find_import_blkid(hdl, &lock, &cache) != 0)
2008 * Create a thread pool to parallelize the process of reading and
2009 * validating labels, a large number of threads can be used due to
2010 * minimal contention.
2012 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 0, NULL);
2013 for (slice = avl_first(cache); slice;
2014 (slice = avl_walk(cache, slice, AVL_AFTER)))
2015 (void) tpool_dispatch(t, zpool_open_func, slice);
2021 * Process the cache filtering out any entries which are not
2022 * for the specificed pool then adding matching label configs.
2025 while ((slice = avl_destroy_nodes(cache, &cookie)) != NULL) {
2026 if (slice->rn_config != NULL) {
2027 nvlist_t *config = slice->rn_config;
2028 boolean_t matched = B_TRUE;
2029 boolean_t aux = B_FALSE;
2033 * Check if it's a spare or l2cache device. If it is,
2034 * we need to skip the name and guid check since they
2035 * don't exist on aux device label.
2037 if (iarg->poolname != NULL || iarg->guid != 0) {
2039 aux = nvlist_lookup_uint64(config,
2040 ZPOOL_CONFIG_POOL_STATE, &state) == 0 &&
2041 (state == POOL_STATE_SPARE ||
2042 state == POOL_STATE_L2CACHE);
2045 if (iarg->poolname != NULL && !aux) {
2048 matched = nvlist_lookup_string(config,
2049 ZPOOL_CONFIG_POOL_NAME, &pname) == 0 &&
2050 strcmp(iarg->poolname, pname) == 0;
2051 } else if (iarg->guid != 0 && !aux) {
2054 matched = nvlist_lookup_uint64(config,
2055 ZPOOL_CONFIG_POOL_GUID, &this_guid) == 0 &&
2056 iarg->guid == this_guid;
2059 nvlist_free(config);
2062 * Verify all remaining entries can be opened
2063 * exclusively. This will prune all underlying
2064 * multipath devices which otherwise could
2065 * result in the vdev appearing as UNAVAIL.
2067 * Under zdb, this step isn't required and
2068 * would prevent a zdb -e of active pools with
2071 fd = open(slice->rn_name, O_RDONLY | O_EXCL);
2072 if (fd >= 0 || iarg->can_be_active) {
2075 add_config(hdl, &pools,
2076 slice->rn_name, slice->rn_order,
2077 slice->rn_num_labels, config);
2079 nvlist_free(config);
2083 free(slice->rn_name);
2088 pthread_mutex_destroy(&lock);
2090 ret = get_configs(hdl, &pools, iarg->can_be_active, iarg->policy);
2092 for (pe = pools.pools; pe != NULL; pe = penext) {
2093 penext = pe->pe_next;
2094 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) {
2095 venext = ve->ve_next;
2096 for (ce = ve->ve_configs; ce != NULL; ce = cenext) {
2097 cenext = ce->ce_next;
2098 nvlist_free(ce->ce_config);
2106 for (ne = pools.names; ne != NULL; ne = nenext) {
2107 nenext = ne->ne_next;
2116 zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv)
2118 importargs_t iarg = { 0 };
2123 return (zpool_find_import_impl(hdl, &iarg));
2127 * Given a cache file, return the contents as a list of importable pools.
2128 * poolname or guid (but not both) are provided by the caller when trying
2129 * to import a specific pool.
2132 zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile,
2133 char *poolname, uint64_t guid)
2137 struct stat64 statbuf;
2138 nvlist_t *raw, *src, *dst;
2145 verify(poolname == NULL || guid == 0);
2147 if ((fd = open(cachefile, O_RDONLY)) < 0) {
2148 zfs_error_aux(hdl, "%s", strerror(errno));
2149 (void) zfs_error(hdl, EZFS_BADCACHE,
2150 dgettext(TEXT_DOMAIN, "failed to open cache file"));
2154 if (fstat64(fd, &statbuf) != 0) {
2155 zfs_error_aux(hdl, "%s", strerror(errno));
2157 (void) zfs_error(hdl, EZFS_BADCACHE,
2158 dgettext(TEXT_DOMAIN, "failed to get size of cache file"));
2162 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) {
2167 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) {
2170 (void) zfs_error(hdl, EZFS_BADCACHE,
2171 dgettext(TEXT_DOMAIN,
2172 "failed to read cache file contents"));
2178 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) {
2180 (void) zfs_error(hdl, EZFS_BADCACHE,
2181 dgettext(TEXT_DOMAIN,
2182 "invalid or corrupt cache file contents"));
2189 * Go through and get the current state of the pools and refresh their
2192 if (nvlist_alloc(&pools, 0, 0) != 0) {
2193 (void) no_memory(hdl);
2199 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) {
2200 src = fnvpair_value_nvlist(elem);
2202 name = fnvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME);
2203 if (poolname != NULL && strcmp(poolname, name) != 0)
2206 this_guid = fnvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID);
2207 if (guid != 0 && guid != this_guid)
2210 if (pool_active(hdl, name, this_guid, &active) != 0) {
2219 if (nvlist_add_string(src, ZPOOL_CONFIG_CACHEFILE,
2221 (void) no_memory(hdl);
2227 if ((dst = refresh_config(hdl, src)) == NULL) {
2233 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) {
2234 (void) no_memory(hdl);
2248 name_or_guid_exists(zpool_handle_t *zhp, void *data)
2250 importargs_t *import = data;
2253 if (import->poolname != NULL) {
2256 verify(nvlist_lookup_string(zhp->zpool_config,
2257 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0);
2258 if (strcmp(pool_name, import->poolname) == 0)
2263 verify(nvlist_lookup_uint64(zhp->zpool_config,
2264 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0);
2265 if (pool_guid == import->guid)
2274 zpool_search_import(libzfs_handle_t *hdl, importargs_t *import)
2276 verify(import->poolname == NULL || import->guid == 0);
2279 import->exists = zpool_iter(hdl, name_or_guid_exists, import);
2281 if (import->cachefile != NULL)
2282 return (zpool_find_import_cached(hdl, import->cachefile,
2283 import->poolname, import->guid));
2285 return (zpool_find_import_impl(hdl, import));
2289 pool_match(nvlist_t *cfg, char *tgt)
2291 uint64_t v, guid = strtoull(tgt, NULL, 0);
2295 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &v) == 0)
2298 if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &s) == 0)
2299 return (strcmp(s, tgt) == 0);
2305 zpool_tryimport(libzfs_handle_t *hdl, char *target, nvlist_t **configp,
2309 nvlist_t *match = NULL;
2310 nvlist_t *config = NULL;
2311 char *name = NULL, *sepp = NULL;
2314 char *targetdup = strdup(target);
2318 if ((sepp = strpbrk(targetdup, "/@")) != NULL) {
2323 pools = zpool_search_import(hdl, args);
2325 if (pools != NULL) {
2326 nvpair_t *elem = NULL;
2327 while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
2328 VERIFY0(nvpair_value_nvlist(elem, &config));
2329 if (pool_match(config, targetdup)) {
2331 if (match != NULL) {
2332 /* multiple matches found */
2336 name = nvpair_name(elem);
2343 (void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2350 (void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2351 "%d pools found, use pool GUID\n"), count);
2363 find_guid(nvlist_t *nv, uint64_t guid)
2369 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0);
2373 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
2374 &child, &children) == 0) {
2375 for (c = 0; c < children; c++)
2376 if (find_guid(child[c], guid))
2383 typedef struct aux_cbdata {
2384 const char *cb_type;
2386 zpool_handle_t *cb_zhp;
2390 find_aux(zpool_handle_t *zhp, void *data)
2392 aux_cbdata_t *cbp = data;
2398 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
2401 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type,
2402 &list, &count) == 0) {
2403 for (i = 0; i < count; i++) {
2404 verify(nvlist_lookup_uint64(list[i],
2405 ZPOOL_CONFIG_GUID, &guid) == 0);
2406 if (guid == cbp->cb_guid) {
2418 * Determines if the pool is in use. If so, it returns true and the state of
2419 * the pool as well as the name of the pool. Name string is allocated and
2420 * must be freed by the caller.
2423 zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr,
2429 uint64_t guid, vdev_guid;
2430 zpool_handle_t *zhp;
2431 nvlist_t *pool_config;
2432 uint64_t stateval, isspare;
2433 aux_cbdata_t cb = { 0 };
2438 if (zpool_read_label(fd, &config, NULL) != 0) {
2439 (void) no_memory(hdl);
2446 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
2448 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
2451 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) {
2452 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
2454 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
2459 case POOL_STATE_EXPORTED:
2461 * A pool with an exported state may in fact be imported
2462 * read-only, so check the in-core state to see if it's
2463 * active and imported read-only. If it is, set
2464 * its state to active.
2466 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive &&
2467 (zhp = zpool_open_canfail(hdl, name)) != NULL) {
2468 if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL))
2469 stateval = POOL_STATE_ACTIVE;
2472 * All we needed the zpool handle for is the
2473 * readonly prop check.
2481 case POOL_STATE_ACTIVE:
2483 * For an active pool, we have to determine if it's really part
2484 * of a currently active pool (in which case the pool will exist
2485 * and the guid will be the same), or whether it's part of an
2486 * active pool that was disconnected without being explicitly
2489 if (pool_active(hdl, name, guid, &isactive) != 0) {
2490 nvlist_free(config);
2496 * Because the device may have been removed while
2497 * offlined, we only report it as active if the vdev is
2498 * still present in the config. Otherwise, pretend like
2501 if ((zhp = zpool_open_canfail(hdl, name)) != NULL &&
2502 (pool_config = zpool_get_config(zhp, NULL))
2506 verify(nvlist_lookup_nvlist(pool_config,
2507 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
2508 ret = find_guid(nvroot, vdev_guid);
2514 * If this is an active spare within another pool, we
2515 * treat it like an unused hot spare. This allows the
2516 * user to create a pool with a hot spare that currently
2517 * in use within another pool. Since we return B_TRUE,
2518 * libdiskmgt will continue to prevent generic consumers
2519 * from using the device.
2521 if (ret && nvlist_lookup_uint64(config,
2522 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare)
2523 stateval = POOL_STATE_SPARE;
2528 stateval = POOL_STATE_POTENTIALLY_ACTIVE;
2533 case POOL_STATE_SPARE:
2535 * For a hot spare, it can be either definitively in use, or
2536 * potentially active. To determine if it's in use, we iterate
2537 * over all pools in the system and search for one with a spare
2538 * with a matching guid.
2540 * Due to the shared nature of spares, we don't actually report
2541 * the potentially active case as in use. This means the user
2542 * can freely create pools on the hot spares of exported pools,
2543 * but to do otherwise makes the resulting code complicated, and
2544 * we end up having to deal with this case anyway.
2547 cb.cb_guid = vdev_guid;
2548 cb.cb_type = ZPOOL_CONFIG_SPARES;
2549 if (zpool_iter(hdl, find_aux, &cb) == 1) {
2550 name = (char *)zpool_get_name(cb.cb_zhp);
2557 case POOL_STATE_L2CACHE:
2560 * Check if any pool is currently using this l2cache device.
2563 cb.cb_guid = vdev_guid;
2564 cb.cb_type = ZPOOL_CONFIG_L2CACHE;
2565 if (zpool_iter(hdl, find_aux, &cb) == 1) {
2566 name = (char *)zpool_get_name(cb.cb_zhp);
2579 if ((*namestr = zfs_strdup(hdl, name)) == NULL) {
2581 zpool_close(cb.cb_zhp);
2582 nvlist_free(config);
2585 *state = (pool_state_t)stateval;
2589 zpool_close(cb.cb_zhp);
2591 nvlist_free(config);