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-rw-r--r--Incremental.c1739
1 files changed, 1739 insertions, 0 deletions
diff --git a/Incremental.c b/Incremental.c
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+++ b/Incremental.c
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+/*
+ * Incremental.c - support --incremental. Part of:
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2006-2013 Neil Brown <neilb@suse.de>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Neil Brown
+ * Email: <neilb@suse.de>
+ * Paper: Neil Brown
+ * Novell Inc
+ * GPO Box Q1283
+ * QVB Post Office, NSW 1230
+ * Australia
+ */
+
+#include "mdadm.h"
+#include <sys/wait.h>
+#include <dirent.h>
+#include <ctype.h>
+
+static int count_active(struct supertype *st, struct mdinfo *sra,
+ int mdfd, char **availp,
+ struct mdinfo *info);
+static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
+ int number, __u64 events, int verbose,
+ char *array_name);
+static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
+ struct map_ent *target,
+ struct supertype *st, int verbose);
+
+static int Incremental_container(struct supertype *st, char *devname,
+ struct context *c, char *only);
+
+int Incremental(struct mddev_dev *devlist, struct context *c,
+ struct supertype *st)
+{
+ /* Add this device to an array, creating the array if necessary
+ * and starting the array if sensible or - if runstop>0 - if possible.
+ *
+ * This has several steps:
+ *
+ * 1/ Check if device is permitted by mdadm.conf, reject if not.
+ * 2/ Find metadata, reject if none appropriate (check
+ * version/name from args)
+ * 3/ Check if there is a match in mdadm.conf
+ * 3a/ if not, check for homehost match. If no match, assemble as
+ * a 'foreign' array.
+ * 4/ Determine device number.
+ * - If in mdadm.conf with std name, use that
+ * - UUID in /var/run/mdadm.map use that
+ * - If name is suggestive, use that. unless in use with different uuid.
+ * - Choose a free, high number.
+ * - Use a partitioned device unless strong suggestion not to.
+ * e.g. auto=md
+ * Don't choose partitioned for containers.
+ * 5/ Find out if array already exists
+ * 5a/ if it does not
+ * - choose a name, from mdadm.conf or 'name' field in array.
+ * - create the array
+ * - add the device
+ * 5b/ if it does
+ * - check one drive in array to make sure metadata is a reasonably
+ * close match. Reject if not (e.g. different type)
+ * - add the device
+ * 6/ Make sure /var/run/mdadm.map contains this array.
+ * 7/ Is there enough devices to possibly start the array?
+ * For a container, this means running Incremental_container.
+ * 7a/ if not, finish with success.
+ * 7b/ if yes,
+ * - read all metadata and arrange devices like -A does
+ * - if number of OK devices match expected, or -R and there are enough,
+ * start the array (auto-readonly).
+ */
+ dev_t rdev, rdev2;
+ struct mdinfo info, dinfo;
+ struct mdinfo *sra = NULL, *d;
+ struct mddev_ident *match;
+ char chosen_name[1024];
+ char *md_devname;
+ int rv = 1;
+ struct map_ent *mp, *map = NULL;
+ int dfd = -1, mdfd = -1;
+ char *avail = NULL;
+ int active_disks;
+ int trustworthy;
+ char *name_to_use;
+ struct dev_policy *policy = NULL;
+ struct map_ent target_array;
+ int have_target;
+ char *devname = devlist->devname;
+ int journal_device_missing = 0;
+
+ struct createinfo *ci = conf_get_create_info();
+
+ if (!stat_is_blkdev(devname, &rdev))
+ return rv;
+ dfd = dev_open(devname, O_RDONLY);
+ if (dfd < 0) {
+ if (c->verbose >= 0)
+ pr_err("cannot open %s: %s.\n",
+ devname, strerror(errno));
+ return rv;
+ }
+ /* If the device is a container, we do something very different */
+ if (must_be_container(dfd)) {
+ if (!st)
+ st = super_by_fd(dfd, NULL);
+ if (st && st->ss->load_container)
+ rv = st->ss->load_container(st, dfd, NULL);
+
+ close(dfd);
+ if (!rv && st->ss->container_content) {
+ if (map_lock(&map))
+ pr_err("failed to get exclusive lock on mapfile\n");
+ if (c->export)
+ printf("MD_DEVNAME=%s\n", devname);
+ rv = Incremental_container(st, devname, c, NULL);
+ map_unlock(&map);
+ return rv;
+ }
+
+ pr_err("%s is not part of an md array.\n",
+ devname);
+ return rv;
+ }
+
+ /* 1/ Check if device is permitted by mdadm.conf */
+
+ for (;devlist; devlist = devlist->next)
+ if (conf_test_dev(devlist->devname))
+ break;
+ if (!devlist) {
+ devlist = conf_get_devs();
+ for (;devlist; devlist = devlist->next) {
+ if (stat_is_blkdev(devlist->devname, &rdev2) &&
+ rdev2 == rdev)
+ break;
+ }
+ }
+ if (!devlist) {
+ if (c->verbose >= 0)
+ pr_err("%s not permitted by mdadm.conf.\n",
+ devname);
+ goto out;
+ }
+
+ /* 2/ Find metadata, reject if none appropriate (check
+ * version/name from args) */
+
+ if (!fstat_is_blkdev(dfd, devname, &rdev))
+ goto out;
+
+ dinfo.disk.major = major(rdev);
+ dinfo.disk.minor = minor(rdev);
+
+ policy = disk_policy(&dinfo);
+ have_target = policy_check_path(&dinfo, &target_array);
+
+ if (st == NULL && (st = guess_super_type(dfd, guess_array)) == NULL) {
+ if (c->verbose >= 0)
+ pr_err("no recognisable superblock on %s.\n",
+ devname);
+ rv = try_spare(devname, &dfd, policy,
+ have_target ? &target_array : NULL,
+ NULL, c->verbose);
+ goto out;
+ }
+ st->ignore_hw_compat = 0;
+
+ if (st->ss->compare_super == NULL ||
+ st->ss->load_super(st, dfd, c->verbose >= 0 ? devname : NULL)) {
+ if (c->verbose >= 0)
+ pr_err("no RAID superblock on %s.\n",
+ devname);
+ rv = try_spare(devname, &dfd, policy,
+ have_target ? &target_array : NULL,
+ st, c->verbose);
+ free(st);
+ goto out;
+ }
+ close (dfd); dfd = -1;
+
+ st->ss->getinfo_super(st, &info, NULL);
+
+ /* 3/ Check if there is a match in mdadm.conf */
+ match = conf_match(st, &info, devname, c->verbose, &rv);
+ if (!match && rv == 2)
+ goto out;
+
+ if (match && match->devname && is_devname_ignore(match->devname) == true) {
+ if (c->verbose >= 0)
+ pr_err("array containing %s is explicitly ignored by mdadm.conf\n",
+ devname);
+ goto out;
+ }
+
+ /* 3a/ if not, check for homehost match. If no match, continue
+ * but don't trust the 'name' in the array. Thus a 'random' minor
+ * number will be assigned, and the device name will be based
+ * on that. */
+ if (match)
+ trustworthy = LOCAL;
+ else if (st->ss->match_home(st, c->homehost) == 1)
+ trustworthy = LOCAL;
+ else if (st->ss->match_home(st, "any") == 1)
+ trustworthy = LOCAL_ANY;
+ else
+ trustworthy = FOREIGN;
+
+ if (!match && !conf_test_metadata(st->ss->name, policy,
+ (trustworthy == LOCAL))) {
+ if (c->verbose >= 1)
+ pr_err("%s has metadata type %s for which auto-assembly is disabled\n",
+ devname, st->ss->name);
+ goto out;
+ }
+ if (trustworthy == LOCAL_ANY)
+ trustworthy = LOCAL;
+
+ /* There are three possible sources for 'autof': command line,
+ * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
+ * ARRAY takes precedence, then command line, then
+ * CREATE.
+ */
+ if (match && match->autof)
+ c->autof = match->autof;
+ if (c->autof == 0)
+ c->autof = ci->autof;
+
+ name_to_use = info.name;
+ if (name_to_use[0] == 0 && is_container(info.array.level)) {
+ name_to_use = info.text_version;
+ trustworthy = METADATA;
+ }
+ if (name_to_use[0] && trustworthy != LOCAL &&
+ ! c->require_homehost &&
+ conf_name_is_free(name_to_use))
+ trustworthy = LOCAL;
+
+ /* strip "hostname:" prefix from name if we have decided
+ * to treat it as LOCAL
+ */
+ if (trustworthy == LOCAL && strchr(name_to_use, ':') != NULL)
+ name_to_use = strchr(name_to_use, ':')+1;
+
+ /* 4/ Check if array exists.
+ */
+ if (map_lock(&map))
+ pr_err("failed to get exclusive lock on mapfile\n");
+ /* Now check we can get O_EXCL. If not, probably "mdadm -A" has
+ * taken over
+ */
+ dfd = dev_open(devname, O_RDONLY|O_EXCL);
+ if (dfd < 0) {
+ if (c->verbose >= 0)
+ pr_err("cannot reopen %s: %s.\n",
+ devname, strerror(errno));
+ goto out_unlock;
+ }
+ /* Cannot hold it open while we add the device to the array,
+ * so we must release the O_EXCL and depend on the map_lock()
+ * So now is the best time to remove any partitions.
+ */
+ remove_partitions(dfd);
+ close(dfd);
+ dfd = -1;
+
+ mp = map_by_uuid(&map, info.uuid);
+ if (mp)
+ mdfd = open_dev(mp->devnm);
+ else
+ mdfd = -1;
+
+ if (mdfd < 0) {
+
+ /* Skip the clustered ones. This should be started by
+ * clustering resource agents
+ */
+ if (info.array.state & (1 << MD_SB_CLUSTERED))
+ goto out;
+
+ /* Couldn't find an existing array, maybe make a new one */
+ mdfd = create_mddev(match ? match->devname : NULL,
+ name_to_use, c->autof, trustworthy, chosen_name, 0);
+
+ if (mdfd < 0)
+ goto out_unlock;
+
+ if (sysfs_init(&info, mdfd, NULL)) {
+ pr_err("unable to initialize sysfs for %s\n",
+ chosen_name);
+ rv = 2;
+ goto out_unlock;
+ }
+
+ if (set_array_info(mdfd, st, &info) != 0) {
+ pr_err("failed to set array info for %s: %s\n",
+ chosen_name, strerror(errno));
+ rv = 2;
+ goto out_unlock;
+ }
+
+ dinfo = info;
+ dinfo.disk.major = major(rdev);
+ dinfo.disk.minor = minor(rdev);
+ if (add_disk(mdfd, st, &info, &dinfo) != 0) {
+ pr_err("failed to add %s to new array %s: %s.\n",
+ devname, chosen_name, strerror(errno));
+ ioctl(mdfd, STOP_ARRAY, 0);
+ rv = 2;
+ goto out_unlock;
+ }
+ sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
+ GET_OFFSET | GET_SIZE));
+
+ if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
+ /* It really should be 'none' - must be old buggy
+ * kernel, and mdadm -I may not be able to complete.
+ * So reject it.
+ */
+ ioctl(mdfd, STOP_ARRAY, NULL);
+ pr_err("You have an old buggy kernel which cannot support\n --incremental reliably. Aborting.\n");
+ rv = 2;
+ goto out_unlock;
+ }
+ info.array.working_disks = 1;
+ /* 6/ Make sure /var/run/mdadm.map contains this array. */
+ map_update(&map, fd2devnm(mdfd),
+ info.text_version,
+ info.uuid, chosen_name);
+ } else {
+ /* 5b/ if it does */
+ /* - check one drive in array to make sure metadata is a reasonably */
+ /* close match. Reject if not (e.g. different type) */
+ /* - add the device */
+ char dn[20];
+ int dfd2;
+ int err;
+ struct supertype *st2;
+ struct mdinfo info2, *d;
+
+ sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
+ GET_OFFSET | GET_SIZE));
+
+ if (mp->path)
+ strcpy(chosen_name, mp->path);
+ else
+ strcpy(chosen_name, mp->devnm);
+
+ /* It is generally not OK to add non-spare drives to a
+ * running array as they are probably missing because
+ * they failed. However if runstop is 1, then the
+ * array was possibly started early and our best bet is
+ * to add this anyway.
+ * Also if action policy is re-add or better we allow
+ * re-add.
+ * This doesn't apply to containers as the 'non-spare'
+ * flag has a different meaning. The test has to happen
+ * at the device level there
+ */
+ if (!st->ss->external &&
+ (info.disk.state & (1 << MD_DISK_SYNC)) != 0 &&
+ !policy_action_allows(policy, st->ss->name, act_re_add) &&
+ c->runstop < 1) {
+ if (md_array_active(mdfd)) {
+ pr_err("not adding %s to active array (without --run) %s\n",
+ devname, chosen_name);
+ rv = 2;
+ goto out_unlock;
+ }
+ }
+ if (!sra) {
+ rv = 2;
+ goto out_unlock;
+ }
+ if (sra->devs) {
+ sprintf(dn, "%d:%d", sra->devs->disk.major,
+ sra->devs->disk.minor);
+ dfd2 = dev_open(dn, O_RDONLY);
+ if (dfd2 < 0) {
+ pr_err("unable to open %s\n", devname);
+ rv = 2;
+ goto out_unlock;
+ }
+ st2 = dup_super(st);
+ if (st2->ss->load_super(st2, dfd2, NULL) ||
+ st->ss->compare_super(st, st2, 1) != 0) {
+ pr_err("metadata mismatch between %s and chosen array %s\n",
+ devname, chosen_name);
+ close(dfd2);
+ rv = 2;
+ goto out_unlock;
+ }
+ close(dfd2);
+ st2->ss->getinfo_super(st2, &info2, NULL);
+ st2->ss->free_super(st2);
+ if (info.array.level != info2.array.level ||
+ memcmp(info.uuid, info2.uuid, 16) != 0 ||
+ info.array.raid_disks != info2.array.raid_disks) {
+ pr_err("unexpected difference between %s and %s.\n",
+ chosen_name, devname);
+ rv = 2;
+ goto out_unlock;
+ }
+ }
+ info.disk.major = major(rdev);
+ info.disk.minor = minor(rdev);
+ /* add disk needs to know about containers */
+ if (st->ss->external)
+ sra->array.level = LEVEL_CONTAINER;
+
+ if (info.array.state & (1 << MD_SB_CLUSTERED))
+ info.disk.state |= (1 << MD_DISK_CLUSTER_ADD);
+
+ err = add_disk(mdfd, st, sra, &info);
+ if (err < 0 && errno == EBUSY) {
+ /* could be another device present with the same
+ * disk.number. Find and reject any such
+ */
+ find_reject(mdfd, st, sra, info.disk.number,
+ info.events, c->verbose, chosen_name);
+ err = add_disk(mdfd, st, sra, &info);
+ }
+ if (err < 0 && errno == EINVAL &&
+ info.disk.state & (1<<MD_DISK_SYNC)) {
+ /* Maybe it needs to be added as a spare */
+ if (policy_action_allows(policy, st->ss->name,
+ act_force_spare)) {
+ info.disk.state &= ~(1<<MD_DISK_SYNC);
+ err = add_disk(mdfd, st, sra, &info);
+ } else
+ if (c->verbose >= 0)
+ pr_err("can only add %s to %s as a spare, and force-spare is not set.\n",
+ devname, chosen_name);
+ }
+ if (err < 0) {
+ pr_err("failed to add %s to existing array %s: %s.\n",
+ devname, chosen_name, strerror(errno));
+ rv = 2;
+ goto out_unlock;
+ }
+ info.array.working_disks = 0;
+ for (d = sra->devs; d; d=d->next)
+ info.array.working_disks ++;
+
+ }
+ if (strncmp(chosen_name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+ md_devname = chosen_name + DEV_MD_DIR_LEN;
+ else
+ md_devname = chosen_name;
+ if (c->export) {
+ printf("MD_DEVICE=%s\n", fd2devnm(mdfd));
+ printf("MD_DEVNAME=%s\n", md_devname);
+ printf("MD_FOREIGN=%s\n", trustworthy == FOREIGN ? "yes" : "no");
+ }
+
+ /* 7/ Is there enough devices to possibly start the array? */
+ /* 7a/ if not, finish with success. */
+ if (is_container(info.array.level)) {
+ char devnm[32];
+ /* Try to assemble within the container */
+ sysfs_uevent(sra, "change");
+ if (!c->export && c->verbose >= 0)
+ pr_err("container %s now has %d device%s\n",
+ chosen_name, info.array.working_disks,
+ info.array.working_disks == 1?"":"s");
+ sysfs_rules_apply(chosen_name, &info);
+ wait_for(chosen_name, mdfd);
+ if (st->ss->external)
+ strcpy(devnm, fd2devnm(mdfd));
+ if (st->ss->load_container)
+ rv = st->ss->load_container(st, mdfd, NULL);
+ close(mdfd);
+ sysfs_free(sra);
+ if (!rv)
+ rv = Incremental_container(st, chosen_name, c, NULL);
+ map_unlock(&map);
+ /* after spare is added, ping monitor for external metadata
+ * so that it can eg. try to rebuild degraded array */
+ if (st->ss->external)
+ ping_monitor(devnm);
+ return rv;
+ }
+
+ /* We have added something to the array, so need to re-read the
+ * state. Eventually this state should be kept up-to-date as
+ * things change.
+ */
+ sysfs_free(sra);
+ sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
+ GET_OFFSET | GET_SIZE));
+ active_disks = count_active(st, sra, mdfd, &avail, &info);
+
+ if (!avail)
+ goto out_unlock;
+
+ journal_device_missing = (info.journal_device_required) && (info.journal_clean == 0);
+
+ if (info.consistency_policy == CONSISTENCY_POLICY_PPL)
+ info.array.state |= 1;
+
+ if (enough(info.array.level, info.array.raid_disks,
+ info.array.layout, info.array.state & 1, avail) == 0) {
+ if (c->export) {
+ printf("MD_STARTED=no\n");
+ } else if (c->verbose >= 0)
+ pr_err("%s attached to %s, not enough to start (%d).\n",
+ devname, chosen_name, active_disks);
+ rv = 0;
+ goto out_unlock;
+ }
+
+ /* 7b/ if yes, */
+ /* - if number of OK devices match expected, or -R and there */
+ /* are enough, */
+ /* + add any bitmap file */
+ /* + start the array (auto-readonly). */
+
+ if (md_array_active(mdfd)) {
+ if (c->export) {
+ printf("MD_STARTED=already\n");
+ } else if (c->verbose >= 0)
+ pr_err("%s attached to %s which is already active.\n",
+ devname, chosen_name);
+ rv = 0;
+ goto out_unlock;
+ }
+
+ map_unlock(&map);
+ if (c->runstop > 0 || (!journal_device_missing && active_disks >= info.array.working_disks)) {
+ struct mdinfo *dsk;
+ /* Let's try to start it */
+
+ if (journal_device_missing)
+ pr_err("Trying to run with missing journal device\n");
+ if (info.reshape_active && !(info.reshape_active & RESHAPE_NO_BACKUP)) {
+ pr_err("%s: This array is being reshaped and cannot be started\n",
+ chosen_name);
+ cont_err("by --incremental. Please use --assemble\n");
+ goto out;
+ }
+ if (match && match->bitmap_file) {
+ int bmfd = open(match->bitmap_file, O_RDWR);
+ if (bmfd < 0) {
+ pr_err("Could not open bitmap file %s.\n",
+ match->bitmap_file);
+ goto out;
+ }
+ if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
+ close(bmfd);
+ pr_err("Failed to set bitmapfile for %s.\n",
+ chosen_name);
+ goto out;
+ }
+ close(bmfd);
+ }
+ /* Need to remove from the array any devices which
+ * 'count_active' discerned were too old or inappropriate
+ */
+ for (d = sra ? sra->devs : NULL ; d ; d = d->next)
+ if (d->disk.state & (1<<MD_DISK_REMOVED))
+ remove_disk(mdfd, st, sra, d);
+
+ if ((sra == NULL || active_disks >= info.array.working_disks) &&
+ trustworthy != FOREIGN)
+ rv = ioctl(mdfd, RUN_ARRAY, NULL);
+ else
+ rv = sysfs_set_str(sra, NULL,
+ "array_state", "read-auto");
+ /* Array might be O_EXCL which will interfere with
+ * fsck and mount. So re-open without O_EXCL.
+ */
+ reopen_mddev(mdfd);
+ if (rv == 0) {
+ if (c->export) {
+ printf("MD_STARTED=yes\n");
+ } else if (c->verbose >= 0)
+ pr_err("%s attached to %s, which has been started.\n",
+ devname, chosen_name);
+ rv = 0;
+ wait_for(chosen_name, mdfd);
+ /* We just started the array, so some devices
+ * might have been evicted from the array
+ * because their event counts were too old.
+ * If the action=re-add policy is in-force for
+ * those devices we should re-add them now.
+ */
+ for (dsk = sra->devs; dsk ; dsk = dsk->next) {
+ if (disk_action_allows(dsk, st->ss->name,
+ act_re_add) &&
+ add_disk(mdfd, st, sra, dsk) == 0)
+ pr_err("%s re-added to %s\n",
+ dsk->sys_name, chosen_name);
+ }
+ } else {
+ pr_err("%s attached to %s, but failed to start: %s.\n",
+ devname, chosen_name, strerror(errno));
+ rv = 1;
+ }
+ } else {
+ if (c->export) {
+ printf("MD_STARTED=unsafe\n");
+ } else if (journal_device_missing) {
+ pr_err("Journal device is missing, not safe to start yet.\n");
+ } else if (c->verbose >= 0)
+ pr_err("%s attached to %s, not enough to start safely.\n",
+ devname, chosen_name);
+ rv = 0;
+ }
+out:
+ free(avail);
+ if (dfd >= 0)
+ close(dfd);
+ if (mdfd >= 0)
+ close(mdfd);
+ if (policy)
+ dev_policy_free(policy);
+ sysfs_free(sra);
+ return rv;
+out_unlock:
+ map_unlock(&map);
+ goto out;
+}
+
+static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
+ int number, __u64 events, int verbose,
+ char *array_name)
+{
+ /* Find a device attached to this array with a disk.number of number
+ * and events less than the passed events, and remove the device.
+ */
+ struct mdinfo *d;
+
+ if (md_array_active(mdfd))
+ return; /* not safe to remove from active arrays
+ * without thinking more */
+
+ for (d = sra->devs; d ; d = d->next) {
+ char dn[24]; // 2*11 bytes for ints (including sign) + colon + null byte
+ int dfd;
+ struct mdinfo info;
+ sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
+ dfd = dev_open(dn, O_RDONLY);
+ if (dfd < 0)
+ continue;
+ if (st->ss->load_super(st, dfd, NULL)) {
+ close(dfd);
+ continue;
+ }
+ st->ss->getinfo_super(st, &info, NULL);
+ st->ss->free_super(st);
+ close(dfd);
+
+ if (info.disk.number != number || info.events >= events)
+ continue;
+
+ if (d->disk.raid_disk > -1)
+ sysfs_set_str(sra, d, "slot", STR_COMMON_NONE);
+ if (sysfs_set_str(sra, d, "state", "remove") == 0)
+ if (verbose >= 0)
+ pr_err("removing old device %s from %s\n",
+ d->sys_name+4, array_name);
+ }
+}
+
+static int count_active(struct supertype *st, struct mdinfo *sra,
+ int mdfd, char **availp,
+ struct mdinfo *bestinfo)
+{
+ /* count how many devices in sra think they are active */
+ struct mdinfo *d;
+ int cnt = 0;
+ int replcnt = 0;
+ __u64 max_events = 0;
+ __u64 max_journal_events = 0;
+ char *avail = NULL;
+ int *best = NULL;
+ char *devmap = NULL;
+ int numdevs = 0;
+ int devnum;
+ int b, i;
+ int raid_disks = 0;
+
+ if (!sra)
+ return 0;
+
+ for (d = sra->devs ; d ; d = d->next)
+ numdevs++;
+ for (d = sra->devs, devnum = 0 ; d ; d = d->next, devnum++) {
+ char dn[30];
+ int dfd;
+ int ok;
+ struct mdinfo info;
+
+ sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
+ dfd = dev_open(dn, O_RDONLY);
+ if (dfd < 0)
+ continue;
+ ok = st->ss->load_super(st, dfd, NULL);
+ close(dfd);
+ if (ok != 0)
+ continue;
+
+ info.array.raid_disks = raid_disks;
+ st->ss->getinfo_super(st, &info, devmap + raid_disks * devnum);
+ if (info.disk.raid_disk == MD_DISK_ROLE_JOURNAL &&
+ info.events > max_journal_events)
+ max_journal_events = info.events;
+ if (!avail) {
+ raid_disks = info.array.raid_disks;
+ avail = xcalloc(raid_disks, 1);
+ *availp = avail;
+
+ best = xcalloc(raid_disks, sizeof(int));
+ devmap = xcalloc(raid_disks, numdevs);
+
+ st->ss->getinfo_super(st, &info, devmap);
+ }
+
+ if (info.disk.state & (1<<MD_DISK_SYNC))
+ {
+ if (cnt == 0) {
+ cnt++;
+ max_events = info.events;
+ avail[info.disk.raid_disk] = 2;
+ best[info.disk.raid_disk] = devnum;
+ st->ss->getinfo_super(st, bestinfo, NULL);
+ } else if (info.events == max_events) {
+ avail[info.disk.raid_disk] = 2;
+ best[info.disk.raid_disk] = devnum;
+ } else if (info.events == max_events-1) {
+ if (avail[info.disk.raid_disk] == 0) {
+ avail[info.disk.raid_disk] = 1;
+ best[info.disk.raid_disk] = devnum;
+ }
+ } else if (info.events < max_events - 1)
+ ;
+ else if (info.events == max_events+1) {
+ int i;
+ max_events = info.events;
+ for (i = 0; i < raid_disks; i++)
+ if (avail[i])
+ avail[i]--;
+ avail[info.disk.raid_disk] = 2;
+ best[info.disk.raid_disk] = devnum;
+ st->ss->getinfo_super(st, bestinfo, NULL);
+ } else { /* info.events much bigger */
+ memset(avail, 0, raid_disks);
+ max_events = info.events;
+ avail[info.disk.raid_disk] = 2;
+ best[info.disk.raid_disk] = devnum;
+ st->ss->getinfo_super(st, bestinfo, NULL);
+ }
+ } else if (info.disk.state & (1<<MD_DISK_REPLACEMENT))
+ replcnt++;
+ st->ss->free_super(st);
+ }
+ if (max_journal_events >= max_events - 1)
+ bestinfo->journal_clean = 1;
+
+ if (!avail)
+ return 0;
+ /* We need to reject any device that thinks the best device is
+ * failed or missing */
+ for (b = 0; b < raid_disks; b++)
+ if (avail[b] == 2)
+ break;
+ cnt = 0;
+ for (i = 0 ; i < raid_disks ; i++) {
+ if (i != b && avail[i])
+ if (devmap[raid_disks * best[i] + b] == 0) {
+ /* This device thinks 'b' is failed -
+ * don't use it */
+ devnum = best[i];
+ for (d=sra->devs ; devnum; d = d->next)
+ devnum--;
+ d->disk.state |= (1 << MD_DISK_REMOVED);
+ avail[i] = 0;
+ }
+ if (avail[i])
+ cnt++;
+ }
+ /* Also need to reject any spare device with an event count that
+ * is too high
+ */
+ for (d = sra->devs; d; d = d->next) {
+ if (!(d->disk.state & (1<<MD_DISK_SYNC)) &&
+ d->events > max_events)
+ d->disk.state |= (1 << MD_DISK_REMOVED);
+ }
+ free(best);
+ free(devmap);
+ return cnt + replcnt;
+}
+
+/* test if container has degraded member(s) */
+static int
+container_members_max_degradation(struct map_ent *map, struct map_ent *me)
+{
+ struct mdinfo *sra;
+ int degraded, max_degraded = 0;
+
+ for(; map; map = map->next) {
+ if (!metadata_container_matches(map->metadata, me->devnm))
+ continue;
+ /* most accurate information regarding array degradation */
+ sra = sysfs_read(-1, map->devnm,
+ GET_DISKS | GET_DEVS | GET_STATE);
+ if (!sra)
+ continue;
+ degraded = sra->array.raid_disks - sra->array.active_disks -
+ sra->array.spare_disks;
+ if (degraded > max_degraded)
+ max_degraded = degraded;
+ sysfs_free(sra);
+ }
+
+ return max_degraded;
+}
+
+static int array_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
+ struct map_ent *target, int bare,
+ struct supertype *st, int verbose)
+{
+ /* This device doesn't have any md metadata
+ * The device policy allows 'spare' and if !bare, it allows spare-same-slot.
+ * If 'st' is not set, then we only know that some metadata allows this,
+ * others possibly don't.
+ * So look for a container or array to attach the device to.
+ * Prefer 'target' if that is set and the array is found.
+ *
+ * If st is set, then only arrays of that type are considered
+ * Return 0 on success, or some exit code on failure, probably 1.
+ */
+ int rv = 1;
+ dev_t rdev;
+ struct map_ent *mp, *map = NULL;
+ struct mdinfo *chosen = NULL;
+ int dfd = *dfdp;
+
+ if (!fstat_is_blkdev(dfd, devname, &rdev))
+ return 1;
+
+ /*
+ * Now we need to find a suitable array to add this to.
+ * We only accept arrays that:
+ * - match 'st'
+ * - are in the same domains as the device
+ * - are of an size for which the device will be useful
+ * and we choose the one that is the most degraded
+ */
+
+ if (map_lock(&map)) {
+ pr_err("failed to get exclusive lock on mapfile\n");
+ return 1;
+ }
+ for (mp = map ; mp ; mp = mp->next) {
+ struct supertype *st2;
+ struct domainlist *dl = NULL;
+ struct mdinfo *sra;
+ unsigned long long devsize, freesize = 0;
+ struct spare_criteria sc = {0, 0};
+
+ if (is_subarray(mp->metadata))
+ continue;
+ if (st) {
+ st2 = st->ss->match_metadata_desc(mp->metadata);
+ if (!st2 ||
+ (st->minor_version >= 0 &&
+ st->minor_version != st2->minor_version)) {
+ if (verbose > 1)
+ pr_err("not adding %s to %s as metadata type doesn't match\n",
+ devname, mp->path);
+ free(st2);
+ continue;
+ }
+ free(st2);
+ }
+ sra = sysfs_read(-1, mp->devnm,
+ GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE|
+ GET_COMPONENT|GET_VERSION);
+ if (sra)
+ sra->array.failed_disks = -1;
+ else
+ continue;
+ if (st == NULL) {
+ int i;
+ st2 = NULL;
+ for(i = 0; !st2 && superlist[i]; i++)
+ st2 = superlist[i]->match_metadata_desc(
+ sra->text_version);
+ if (!st2) {
+ if (verbose > 1)
+ pr_err("not adding %s to %s as metadata not recognised.\n",
+ devname, mp->path);
+ goto next;
+ }
+ /* Need to double check the 'act_spare' permissions applies
+ * to this metadata.
+ */
+ if (!policy_action_allows(pol, st2->ss->name, act_spare))
+ goto next;
+ if (!bare && !policy_action_allows(pol, st2->ss->name,
+ act_spare_same_slot))
+ goto next;
+ } else
+ st2 = st;
+ /* update number of failed disks for mostly degraded
+ * container member */
+ if (sra->array.failed_disks == -1)
+ sra->array.failed_disks = container_members_max_degradation(map, mp);
+
+ get_dev_size(dfd, NULL, &devsize);
+ if (sra->component_size == 0) {
+ /* true for containers, here we must read superblock
+ * to obtain minimum spare size */
+ struct supertype *st3 = dup_super(st2);
+ int mdfd = open_dev(mp->devnm);
+ if (mdfd < 0) {
+ free(st3);
+ goto next;
+ }
+ if (st3->ss->load_container &&
+ !st3->ss->load_container(st3, mdfd, mp->path)) {
+ if (st3->ss->get_spare_criteria)
+ st3->ss->get_spare_criteria(st3, &sc);
+ st3->ss->free_super(st3);
+ }
+ free(st3);
+ close(mdfd);
+ }
+ if ((sra->component_size > 0 &&
+ st2->ss->validate_geometry(st2, sra->array.level, sra->array.layout,
+ sra->array.raid_disks, &sra->array.chunk_size,
+ sra->component_size,
+ sra->devs ? sra->devs->data_offset : INVALID_SECTORS,
+ devname, &freesize, sra->consistency_policy,
+ 0) &&
+ freesize < sra->component_size) ||
+ (sra->component_size == 0 && devsize < sc.min_size)) {
+ if (verbose > 1)
+ pr_err("not adding %s to %s as it is too small\n",
+ devname, mp->path);
+ goto next;
+ }
+ /* test against target.
+ * If 'target' is set and 'bare' is false, we only accept
+ * arrays/containers that match 'target'.
+ * If 'target' is set and 'bare' is true, we prefer the
+ * array which matches 'target'.
+ * target is considered only if we deal with degraded array
+ */
+ if (target && policy_action_allows(pol, st2->ss->name,
+ act_spare_same_slot)) {
+ if (strcmp(target->metadata, mp->metadata) == 0 &&
+ memcmp(target->uuid, mp->uuid,
+ sizeof(target->uuid)) == 0 &&
+ sra->array.failed_disks > 0) {
+ /* This is our target!! */
+ sysfs_free(chosen);
+ chosen = sra;
+ sra = NULL;
+ /* skip to end so we don't check any more */
+ while (mp->next)
+ mp = mp->next;
+ goto next;
+ }
+ /* not our target */
+ if (!bare)
+ goto next;
+ }
+
+ dl = domain_from_array(sra, st2->ss->name);
+ if (domain_test(dl, pol, st2->ss->name) != 1) {
+ /* domain test fails */
+ if (verbose > 1)
+ pr_err("not adding %s to %s as it is not in a compatible domain\n",
+ devname, mp->path);
+
+ goto next;
+ }
+ /* all tests passed, OK to add to this array */
+ if (!chosen) {
+ chosen = sra;
+ sra = NULL;
+ } else if (chosen->array.failed_disks < sra->array.failed_disks) {
+ sysfs_free(chosen);
+ chosen = sra;
+ sra = NULL;
+ }
+ next:
+ sysfs_free(sra);
+ if (st != st2)
+ free(st2);
+ if (dl)
+ domain_free(dl);
+ }
+ if (chosen) {
+ /* add current device to chosen array as a spare */
+ int mdfd = open_dev(chosen->sys_name);
+ if (mdfd >= 0) {
+ struct mddev_dev devlist;
+ char chosen_devname[24]; // 2*11 for int (including signs) + colon + null
+ devlist.next = NULL;
+ devlist.used = 0;
+ devlist.writemostly = FlagDefault;
+ devlist.failfast = FlagDefault;
+ devlist.devname = chosen_devname;
+ sprintf(chosen_devname, "%d:%d", major(rdev),
+ minor(rdev));
+ devlist.disposition = 'a';
+ close(dfd);
+ *dfdp = -1;
+ rv = Manage_subdevs(chosen->sys_name, mdfd, &devlist,
+ -1, 0, UOPT_UNDEFINED, 0);
+ close(mdfd);
+ }
+ if (verbose > 0) {
+ if (rv == 0)
+ pr_err("added %s as spare for %s\n",
+ devname, chosen->sys_name);
+ else
+ pr_err("failed to add %s as spare for %s\n",
+ devname, chosen->sys_name);
+ }
+ sysfs_free(chosen);
+ }
+ map_unlock(&map);
+ return rv;
+}
+
+static int partition_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
+ struct supertype *st, int verbose)
+{
+ /* we know that at least one partition virtual-metadata is
+ * allowed to incorporate spares like this device. We need to
+ * find a suitable device to copy partition information from.
+ *
+ * Getting a list of all disk (not partition) devices is
+ * slightly non-trivial. We could look at /sys/block, but
+ * that is theoretically due to be removed. Maybe best to use
+ * /dev/disk/by-path/?* and ignore names ending '-partNN' as
+ * we depend on this directory of 'path' info. But that fails
+ * to find loop devices and probably others. Maybe don't
+ * worry about that, they aren't the real target.
+ *
+ * So: check things in /dev/disk/by-path to see if they are in
+ * a compatible domain, then load the partition table and see
+ * if it is OK for the new device, and choose the largest
+ * partition table that fits.
+ */
+ DIR *dir;
+ struct dirent *de;
+ char *chosen = NULL;
+ unsigned long long chosen_size = 0;
+ struct supertype *chosen_st = NULL;
+ int fd;
+
+ dir = opendir("/dev/disk/by-path");
+ if (!dir)
+ return 1;
+ while ((de = readdir(dir)) != NULL) {
+ char *ep;
+ struct dev_policy *pol2 = NULL;
+ struct domainlist *domlist = NULL;
+ int fd = -1;
+ struct mdinfo info;
+ struct supertype *st2 = NULL;
+ char *devname = NULL;
+ unsigned long long devsectors;
+ char *pathlist[2];
+
+ if (de->d_ino == 0 || de->d_name[0] == '.' ||
+ (de->d_type != DT_LNK && de->d_type != DT_UNKNOWN))
+ goto next;
+
+ ep = de->d_name + strlen(de->d_name);
+ while (ep > de->d_name &&
+ isdigit(ep[-1]))
+ ep--;
+ if (ep > de->d_name + 5 &&
+ strncmp(ep-5, "-part", 5) == 0)
+ /* This is a partition - skip it */
+ goto next;
+
+ pathlist[0] = de->d_name;
+ pathlist[1] = NULL;
+ pol2 = path_policy(pathlist, type_disk);
+
+ domain_merge(&domlist, pol2, st ? st->ss->name : NULL);
+ if (domain_test(domlist, pol, st ? st->ss->name : NULL) != 1)
+ /* new device is incompatible with this device. */
+ goto next;
+
+ domain_free(domlist);
+ domlist = NULL;
+
+ if (asprintf(&devname, "/dev/disk/by-path/%s", de->d_name) != 1) {
+ devname = NULL;
+ goto next;
+ }
+ fd = open(devname, O_RDONLY);
+ if (fd < 0)
+ goto next;
+ if (get_dev_size(fd, devname, &devsectors) == 0)
+ goto next;
+ devsectors >>= 9;
+
+ if (st)
+ st2 = dup_super(st);
+ else
+ st2 = guess_super_type(fd, guess_partitions);
+ if (st2 == NULL || st2->ss->load_super(st2, fd, NULL) < 0)
+ goto next;
+ st2->ignore_hw_compat = 0;
+
+ if (!st) {
+ /* Check domain policy again, this time referring to metadata */
+ domain_merge(&domlist, pol2, st2->ss->name);
+ if (domain_test(domlist, pol, st2->ss->name) != 1)
+ /* Incompatible devices for this metadata type */
+ goto next;
+ if (!policy_action_allows(pol, st2->ss->name, act_spare))
+ /* Some partition types allow sparing, but not
+ * this one.
+ */
+ goto next;
+ }
+
+ st2->ss->getinfo_super(st2, &info, NULL);
+ if (info.component_size > devsectors)
+ /* This partitioning doesn't fit in the device */
+ goto next;
+
+ /* This is an acceptable device to copy partition
+ * metadata from. We could just stop here, but I
+ * think I want to keep looking incase a larger
+ * metadata which makes better use of the device can
+ * be found.
+ */
+ if (chosen == NULL || chosen_size < info.component_size) {
+ chosen_size = info.component_size;
+ free(chosen);
+ chosen = devname;
+ devname = NULL;
+ if (chosen_st) {
+ chosen_st->ss->free_super(chosen_st);
+ free(chosen_st);
+ }
+ chosen_st = st2;
+ st2 = NULL;
+ }
+
+ next:
+ free(devname);
+ domain_free(domlist);
+ dev_policy_free(pol2);
+ if (st2)
+ st2->ss->free_super(st2);
+ free(st2);
+
+ if (fd >= 0)
+ close(fd);
+ }
+
+ closedir(dir);
+
+ if (!chosen)
+ return 1;
+
+ /* 'chosen' is the best device we can find. Let's write its
+ * metadata to devname dfd is read-only so don't use that
+ */
+ fd = open(devname, O_RDWR);
+ if (fd >= 0) {
+ chosen_st->ss->store_super(chosen_st, fd);
+ close(fd);
+ }
+ free(chosen);
+ chosen_st->ss->free_super(chosen_st);
+ free(chosen_st);
+ return 0;
+}
+
+static int is_bare(int dfd)
+{
+ unsigned long long size = 0;
+ char bufpad[4096 + 4096];
+ char *buf = (char*)(((long)bufpad + 4096) & ~4095);
+
+ if (lseek(dfd, 0, SEEK_SET) != 0 ||
+ read(dfd, buf, 4096) != 4096)
+ return 0;
+
+ if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
+ return 0;
+ if (memcmp(buf, buf+1, 4095) != 0)
+ return 0;
+
+ /* OK, first 4K appear blank, try the end. */
+ get_dev_size(dfd, NULL, &size);
+ if (lseek(dfd, size-4096, SEEK_SET) < 0 ||
+ read(dfd, buf, 4096) != 4096)
+ return 0;
+
+ if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
+ return 0;
+ if (memcmp(buf, buf+1, 4095) != 0)
+ return 0;
+
+ return 1;
+}
+
+/* adding a spare to a regular array is quite different from adding one to
+ * a set-of-partitions virtual array.
+ * This function determines which is worth trying and tries as appropriate.
+ * Arrays are given priority over partitions.
+ */
+static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
+ struct map_ent *target,
+ struct supertype *st, int verbose)
+{
+ int i;
+ int rv;
+ int arrays_ok = 0;
+ int partitions_ok = 0;
+ int dfd = *dfdp;
+ int bare;
+
+ /* Can only add a spare if device has at least one domain */
+ if (pol_find(pol, pol_domain) == NULL)
+ return 1;
+ /* And only if some action allows spares */
+ if (!policy_action_allows(pol, st?st->ss->name:NULL, act_spare))
+ return 1;
+
+ /* Now check if the device is bare.
+ * bare devices can always be added as a spare
+ * non-bare devices can only be added if spare-same-slot is permitted,
+ * and this device is replacing a previous device - in which case 'target'
+ * will be set.
+ */
+ if (!is_bare(dfd)) {
+ /* Must have a target and allow same_slot */
+ /* Later - may allow force_spare without target */
+ if (!target ||
+ !policy_action_allows(pol, st?st->ss->name:NULL,
+ act_spare_same_slot)) {
+ if (verbose > 1)
+ pr_err("%s is not bare, so not considering as a spare\n",
+ devname);
+ return 1;
+ }
+ bare = 0;
+ } else
+ bare = 1;
+
+ /* It might be OK to add this device to an array - need to see
+ * what arrays might be candidates.
+ */
+ if (st) {
+ /* just try to add 'array' or 'partition' based on this metadata */
+ if (st->ss->add_to_super)
+ return array_try_spare(devname, dfdp, pol, target, bare,
+ st, verbose);
+ else
+ return partition_try_spare(devname, dfdp, pol,
+ st, verbose);
+ }
+ /* No metadata was specified or found so options are open.
+ * Check for whether any array metadata, or any partition metadata
+ * might allow adding the spare. This check is just help to avoid
+ * a more costly scan of all arrays when we can be sure that will
+ * fail.
+ */
+ for (i = 0; (!arrays_ok || !partitions_ok) && superlist[i] ; i++) {
+ if (superlist[i]->add_to_super && !arrays_ok &&
+ policy_action_allows(pol, superlist[i]->name, act_spare))
+ arrays_ok = 1;
+ if (superlist[i]->add_to_super == NULL && !partitions_ok &&
+ policy_action_allows(pol, superlist[i]->name, act_spare))
+ partitions_ok = 1;
+ }
+ rv = 1;
+ if (arrays_ok)
+ rv = array_try_spare(devname, dfdp, pol, target, bare,
+ st, verbose);
+ if (rv != 0 && partitions_ok)
+ rv = partition_try_spare(devname, dfdp, pol, st, verbose);
+ return rv;
+}
+
+int IncrementalScan(struct context *c, char *devnm)
+{
+ /* look at every device listed in the 'map' file.
+ * If one is found that is not running then:
+ * look in mdadm.conf for bitmap file.
+ * if one exists, but array has none, add it.
+ * try to start array in auto-readonly mode
+ */
+ struct map_ent *mapl = NULL;
+ struct map_ent *me;
+ struct mddev_ident *devs, *mddev;
+ int rv = 0;
+ char container[32];
+ char *only = NULL;
+
+ map_read(&mapl);
+ devs = conf_get_ident(NULL);
+
+restart:
+ for (me = mapl ; me ; me = me->next) {
+ struct mdinfo *sra;
+ int mdfd;
+
+ if (devnm && strcmp(devnm, me->devnm) != 0)
+ continue;
+ if (me->metadata[0] == '/') {
+ char *sl;
+
+ if (!devnm)
+ continue;
+
+ /* member array, need to work on container */
+ strncpy(container, me->metadata+1, 32);
+ container[31] = 0;
+ sl = strchr(container, '/');
+ if (sl)
+ *sl = 0;
+ only = devnm;
+ devnm = container;
+ goto restart;
+ }
+ mdfd = open_dev(me->devnm);
+
+ if (!is_fd_valid(mdfd))
+ continue;
+ if (!isdigit(me->metadata[0])) {
+ /* must be a container */
+ struct supertype *st = super_by_fd(mdfd, NULL);
+ int ret = 0;
+ struct map_ent *map = NULL;
+
+ if (st && st->ss->load_container)
+ ret = st->ss->load_container(st, mdfd, NULL);
+ close_fd(&mdfd);
+ if (!ret && st && st->ss->container_content) {
+ if (map_lock(&map))
+ pr_err("failed to get exclusive lock on mapfile\n");
+ ret = Incremental_container(st, me->path, c, only);
+ map_unlock(&map);
+ }
+ if (ret)
+ rv = 1;
+ continue;
+ }
+ if (md_array_active(mdfd)) {
+ close_fd(&mdfd);
+ continue;
+ }
+ /* Ok, we can try this one. Maybe it needs a bitmap */
+ for (mddev = devs ; mddev ; mddev = mddev->next)
+ if (mddev->devname && me->path &&
+ devname_matches(mddev->devname, me->path))
+ break;
+ if (mddev && mddev->bitmap_file) {
+ /*
+ * Note: early kernels will wrongly fail this, so it
+ * is a hint only
+ */
+ int added = -1;
+ int bmfd;
+
+ bmfd = open(mddev->bitmap_file, O_RDWR);
+ if (is_fd_valid(bmfd)) {
+ added = ioctl(mdfd, SET_BITMAP_FILE, bmfd);
+ close_fd(&bmfd);
+ }
+ if (c->verbose >= 0) {
+ if (added == 0)
+ pr_err("Added bitmap %s to %s\n",
+ mddev->bitmap_file, me->path);
+ else if (errno != EEXIST)
+ pr_err("Failed to add bitmap to %s: %s\n",
+ me->path, strerror(errno));
+ }
+ }
+ /* FIXME check for reshape_active and consider not
+ * starting array.
+ */
+ sra = sysfs_read(mdfd, NULL, 0);
+ if (sra) {
+ if (sysfs_set_str(sra, NULL,
+ "array_state", "read-auto") == 0) {
+ if (c->verbose >= 0)
+ pr_err("started array %s\n",
+ me->path ?: me->devnm);
+ } else {
+ pr_err("failed to start array %s: %s\n",
+ me->path ?: me->devnm,
+ strerror(errno));
+ rv = 1;
+ }
+ sysfs_free(sra);
+ }
+ close_fd(&mdfd);
+ }
+ map_free(mapl);
+ return rv;
+}
+
+static char *container2devname(char *devname)
+{
+ char *mdname = NULL;
+
+ if (devname[0] == '/') {
+ int fd = open(devname, O_RDONLY);
+ if (fd >= 0) {
+ mdname = xstrdup(fd2devnm(fd));
+ close(fd);
+ }
+ } else {
+ int uuid[4];
+ struct map_ent *mp, *map = NULL;
+
+ if (!parse_uuid(devname, uuid))
+ return mdname;
+ mp = map_by_uuid(&map, uuid);
+ if (mp)
+ mdname = xstrdup(mp->devnm);
+ map_free(map);
+ }
+
+ return mdname;
+}
+
+static int Incremental_container(struct supertype *st, char *devname,
+ struct context *c, char *only)
+{
+ /* Collect the contents of this container and for each
+ * array, choose a device name and assemble the array.
+ */
+
+ struct mdinfo *list;
+ struct mdinfo *ra;
+ struct map_ent *map = NULL;
+ struct mdinfo info;
+ int trustworthy;
+ struct mddev_ident *match;
+ int rv = 0;
+ int result = 0;
+
+ st->ss->getinfo_super(st, &info, NULL);
+
+ if (info.container_enough < 0 || (info.container_enough == 0 && c->runstop < 1)) {
+ if (c->export)
+ printf("MD_STARTED=no\n");
+ else if (c->verbose)
+ pr_err("Not enough devices to start the container.\n");
+
+ return 0;
+ }
+
+ match = conf_match(st, &info, devname, c->verbose, &rv);
+ if (match == NULL && rv == 2)
+ return rv;
+
+ /* Need to compute 'trustworthy' */
+ if (match)
+ trustworthy = LOCAL;
+ else if (st->ss->match_home(st, c->homehost) == 1)
+ trustworthy = LOCAL;
+ else if (st->ss->match_home(st, "any") == 1)
+ trustworthy = LOCAL;
+ else
+ trustworthy = FOREIGN;
+
+ list = st->ss->container_content(st, NULL);
+ /* when nothing to activate - quit */
+ if (list == NULL) {
+ if (c->export) {
+ printf("MD_STARTED=nothing\n");
+ }
+ return 0;
+ }
+ for (ra = list ; ra ; ra = ra->next) {
+ int mdfd = -1;
+ char chosen_name[1024];
+ struct map_ent *mp;
+ struct mddev_ident *match = NULL;
+
+ /* do not activate arrays blocked by metadata handler */
+ if (ra->array.state & (1 << MD_SB_BLOCK_VOLUME)) {
+ pr_err("Cannot activate array %s in %s.\n",
+ ra->text_version, devname);
+ continue;
+ }
+ mp = map_by_uuid(&map, ra->uuid);
+
+ if (mp) {
+ mdfd = open_dev(mp->devnm);
+ if (!is_fd_valid(mdfd)) {
+ pr_err("failed to open %s: %s.\n",
+ mp->devnm, strerror(errno));
+ rv = 2;
+ goto release;
+ }
+ if (mp->path)
+ strcpy(chosen_name, mp->path);
+ else
+ strcpy(chosen_name, mp->devnm);
+ } else if (!only) {
+
+ /* Check in mdadm.conf for container == devname and
+ * member == ra->text_version after second slash.
+ */
+ char *sub = strchr(ra->text_version+1, '/');
+ struct mddev_ident *array_list;
+ if (sub) {
+ sub++;
+ array_list = conf_get_ident(NULL);
+ } else
+ array_list = NULL;
+ for(; array_list ; array_list = array_list->next) {
+ char *dn;
+ if (array_list->member == NULL ||
+ array_list->container == NULL)
+ continue;
+ if (strcmp(array_list->member, sub) != 0)
+ continue;
+ if (array_list->uuid_set &&
+ !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
+ continue;
+ dn = container2devname(array_list->container);
+ if (dn == NULL)
+ continue;
+ if (strncmp(dn, ra->text_version+1,
+ strlen(dn)) != 0 ||
+ ra->text_version[strlen(dn)+1] != '/') {
+ free(dn);
+ continue;
+ }
+ free(dn);
+ /* we have a match */
+ match = array_list;
+ if (c->verbose>0)
+ pr_err("match found for member %s\n",
+ array_list->member);
+ break;
+ }
+
+ if (match && match->devname && is_devname_ignore(match->devname) == true) {
+ if (c->verbose > 0)
+ pr_err("array %s/%s is explicitly ignored by mdadm.conf\n",
+ match->container, match->member);
+ continue;
+ }
+ if (match)
+ trustworthy = LOCAL;
+
+ mdfd = create_mddev(match ? match->devname : NULL,
+ ra->name,
+ c->autof,
+ trustworthy,
+ chosen_name, 0);
+
+ if (!is_fd_valid(mdfd)) {
+ pr_err("create_mddev failed with chosen name %s: %s.\n",
+ chosen_name, strerror(errno));
+ rv = 2;
+ goto release;
+ }
+ }
+
+ if (only && (!mp || strcmp(mp->devnm, only) != 0)) {
+ close_fd(&mdfd);
+ continue;
+ }
+
+ assemble_container_content(st, mdfd, ra, c,
+ chosen_name, &result);
+ map_free(map);
+ map = NULL;
+ close_fd(&mdfd);
+ }
+ if (c->export && result) {
+ char sep = '=';
+ printf("MD_STARTED");
+ if (result & INCR_NO) {
+ printf("%cno", sep);
+ sep = ',';
+ }
+ if (result & INCR_UNSAFE) {
+ printf("%cunsafe", sep);
+ sep = ',';
+ }
+ if (result & INCR_ALREADY) {
+ printf("%calready", sep);
+ sep = ',';
+ }
+ if (result & INCR_YES) {
+ printf("%cyes", sep);
+ sep = ',';
+ }
+ printf("\n");
+ }
+
+release:
+ map_free(map);
+ sysfs_free(list);
+ return rv;
+}
+
+static void remove_from_member_array(struct mdstat_ent *memb,
+ struct mddev_dev *devlist, int verbose)
+{
+ int subfd = open_dev(memb->devnm);
+
+ if (subfd >= 0) {
+ /*
+ * Ignore the return value because it's necessary
+ * to handle failure condition here.
+ */
+ Manage_subdevs(memb->devnm, subfd, devlist, verbose,
+ 0, UOPT_UNDEFINED, 0);
+ close(subfd);
+ }
+}
+
+/*
+ * IncrementalRemove - Attempt to see if the passed in device belongs to any
+ * raid arrays, and if so first fail (if needed) and then remove the device.
+ *
+ * @devname - The device we want to remove
+ * @id_path - name as found in /dev/disk/by-path for this device
+ *
+ * Note: the device name must be a kernel name like "sda", so
+ * that we can find it in /proc/mdstat
+ */
+int IncrementalRemove(char *devname, char *id_path, int verbose)
+{
+ int mdfd;
+ int rv = 0;
+ struct mdstat_ent *ent;
+ struct mddev_dev devlist;
+ struct mdinfo mdi;
+ char buf[SYSFS_MAX_BUF_SIZE];
+
+ if (!id_path)
+ dprintf("incremental removal without --path <id_path> lacks the possibility to re-add new device in this port\n");
+
+ if (strchr(devname, '/')) {
+ pr_err("incremental removal requires a kernel device name, not a file: %s\n", devname);
+ return 1;
+ }
+ ent = mdstat_by_component(devname);
+ if (!ent) {
+ if (verbose >= 0)
+ pr_err("%s does not appear to be a component of any array\n", devname);
+ return 1;
+ }
+ if (sysfs_init(&mdi, -1, ent->devnm)) {
+ pr_err("unable to initialize sysfs for: %s\n", devname);
+ return 1;
+ }
+ mdfd = open_dev_excl(ent->devnm);
+ if (is_fd_valid(mdfd)) {
+ close_fd(&mdfd);
+ if (sysfs_get_str(&mdi, NULL, "array_state",
+ buf, sizeof(buf)) > 0) {
+ if (strncmp(buf, "active", 6) == 0 ||
+ strncmp(buf, "clean", 5) == 0)
+ sysfs_set_str(&mdi, NULL,
+ "array_state", "read-auto");
+ }
+ }
+ mdfd = open_dev(ent->devnm);
+ if (mdfd < 0) {
+ if (verbose >= 0)
+ pr_err("Cannot open array %s!!\n", ent->devnm);
+ free_mdstat(ent);
+ return 1;
+ }
+
+ if (id_path) {
+ struct map_ent *map = NULL, *me;
+ me = map_by_devnm(&map, ent->devnm);
+ if (me)
+ policy_save_path(id_path, me);
+ map_free(map);
+ }
+
+ memset(&devlist, 0, sizeof(devlist));
+ devlist.devname = devname;
+ devlist.disposition = 'I';
+ /* for a container, we must fail each member array */
+ if (ent->metadata_version &&
+ strncmp(ent->metadata_version, "external:", 9) == 0) {
+ struct mdstat_ent *mdstat = mdstat_read(0, 0);
+ struct mdstat_ent *memb;
+ for (memb = mdstat ; memb ; memb = memb->next) {
+ if (is_container_member(memb, ent->devnm))
+ remove_from_member_array(memb,
+ &devlist, verbose);
+ }
+ free_mdstat(mdstat);
+ } else {
+ /*
+ * This 'I' incremental remove is a try-best effort,
+ * the failure condition can be safely ignored
+ * because of the following up 'r' remove.
+ */
+ Manage_subdevs(ent->devnm, mdfd, &devlist,
+ verbose, 0, UOPT_UNDEFINED, 0);
+ }
+
+ devlist.disposition = 'r';
+ rv = Manage_subdevs(ent->devnm, mdfd, &devlist,
+ verbose, 0, UOPT_UNDEFINED, 0);
+
+ close(mdfd);
+ free_mdstat(ent);
+ return rv;
+}