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mdadm/Incremental.c
Daniel Baumann 72807d3921
Merging upstream version 4.3+20241202. 
Signed-off-by: Daniel Baumann <daniel@debian.org>
2025-02-14 06:37:23 +01:00

1748 lines
48 KiB
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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 "xmalloc.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;
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;
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, 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;
}
/* 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_events > 0 && 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;
}
/**
* incremental_external_test_spare_criteria() - helper to test spare criteria.
* @st: supertype, must be not NULL, it is duplicated here.
* @container_devnm: devnm of the container.
* @disk_fd: file descriptor of device to tested.
* @verbose: verbose flag.
*
* The function is used on new drive verification path to check if it can be added to external
* container. To test spare criteria, metadata must be loaded. It duplicates super to not mess in
* original one.
* Function is executed if superblock supports get_spare_criteria(), otherwise success is returned.
*/
mdadm_status_t incremental_external_test_spare_criteria(struct supertype *st, char *container_devnm,
int disk_fd, int verbose)
{
mdadm_status_t rv = MDADM_STATUS_ERROR;
char container_devname[PATH_MAX];
struct spare_criteria sc = {0};
struct supertype *dup;
if (!st->ss->get_spare_criteria)
return MDADM_STATUS_SUCCESS;
dup = dup_super(st);
snprintf(container_devname, PATH_MAX, "/dev/%s", container_devnm);
if (dup->ss->get_spare_criteria(dup, container_devname, &sc) != 0) {
if (verbose > 1)
pr_err("Failed to get spare criteria for %s\n", container_devname);
goto out;
}
if (!disk_fd_matches_criteria(dup, disk_fd, &sc)) {
if (verbose > 1)
pr_err("Disk does not match spare criteria for %s\n", container_devname);
goto out;
}
rv = MDADM_STATUS_SUCCESS;
out:
dev_policy_free(sc.pols);
dup->ss->free_super(dup);
free(dup);
return rv;
}
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 freesize = 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);
if (sra->component_size == 0) {
/* true for containers */
if (incremental_external_test_spare_criteria(st2, mp->devnm, dfd, verbose))
goto next;
}
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) {
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 *dev_path_name = 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(&dev_path_name, "/dev/disk/by-path/%s", de->d_name) != 1) {
dev_path_name = NULL;
goto next;
}
fd = open(dev_path_name, O_RDONLY);
if (fd < 0)
goto next;
if (get_dev_size(fd, dev_path_name, &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 = dev_path_name;
dev_path_name = NULL;
if (chosen_st) {
chosen_st->ss->free_super(chosen_st);
free(chosen_st);
}
chosen_st = st2;
st2 = NULL;
}
next:
free(dev_path_name);
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 ((size >= 4096 && 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;
/* 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, 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);
}
}
/**
* is_devnode_path() - check if the devname passed might be devnode path.
* @devnode: the path to check.
*
* Devnode must be located directly in /dev directory. It is not checking existence of the file
* because the device might no longer exist during removal from raid array.
*/
static bool is_devnode_path(char *devnode)
{
char *devnm = strrchr(devnode, '/');
if (!devnm || *(devnm + 1) == 0)
return false;
if (strncmp(devnode, DEV_DIR, DEV_DIR_LEN) == 0 && devnode + DEV_DIR_LEN - 1 == devnm)
return true;
return false;
}
/**
* Incremental_remove() - Remove the device from all raid arrays.
* @devname: the device we want to remove, it could be kernel device name or devnode.
* @id_path: optional, /dev/disk/by-path path to save for bare scenarios support.
* @verbose: verbose flag.
*
* First, fail the device (if needed) and then remove the device from native raid array or external
* container. If it is external container, the device is removed from each subarray first.
*/
int Incremental_remove(char *devname, char *id_path, int verbose)
{
char *devnm = basename(devname);
struct mddev_dev devlist = {0};
char buf[SYSFS_MAX_BUF_SIZE];
struct mdstat_ent *mdstat;
struct mdstat_ent *ent;
struct mdinfo mdi;
int rv = 1;
int mdfd;
if (strcmp(devnm, devname) != 0)
if (!is_devnode_path(devname)) {
pr_err("Cannot remove \"%s\", devnode path or kernel device name is allowed.\n",
devname);
return 1;
}
mdstat = mdstat_read(0, 0);
if (!mdstat) {
pr_err("Cannot read /proc/mdstat file, aborting\n");
return 1;
}
ent = mdstat_find_by_member_name(mdstat, devnm);
if (!ent) {
if (verbose >= 0)
pr_vrb("%s does not appear to be a component of any array\n", devnm);
goto out;
}
if (sysfs_init(&mdi, -1, ent->devnm)) {
pr_err("unable to initialize sysfs for: %s\n", devnm);
goto out;
}
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);
goto out;
}
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);
}
devlist.devname = devnm;
devlist.disposition = 'I';
/* for a container, we must fail each member array */
if (is_mdstat_ent_external(ent)) {
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);
}
} 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_fd(&mdfd);
out:
free_mdstat(mdstat);
return rv;
}
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