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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 <[email protected]>
*
*
* 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: <[email protected]>
* 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).
*/
struct stat stb;
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;
mdu_array_info_t ainf;
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(devname, &stb) < 0) {
if (c->verbose >= 0)
pr_err("stat failed for %s: %s.\n",
devname, strerror(errno));
return rv;
}
if ((stb.st_mode & S_IFMT) != S_IFBLK) {
if (c->verbose >= 0)
pr_err("%s is not a block device.\n",
devname);
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) {
struct stat st2;
if (stat(devlist->devname, &st2) == 0 &&
(st2.st_mode & S_IFMT) == S_IFBLK &&
st2.st_rdev == stb.st_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(dfd, &stb) < 0) {
if (c->verbose >= 0)
pr_err("fstat failed for %s: %s.\n",
devname, strerror(errno));
goto out;
}
if ((stb.st_mode & S_IFMT) != S_IFBLK) {
if (c->verbose >= 0)
pr_err("%s is not a block device.\n",
devname);
goto out;
}
dinfo.disk.major = major(stb.st_rdev);
dinfo.disk.minor = minor(stb.st_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
&& strcasecmp(match->devname, "<ignore>") == 0) {
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 &&
info.array.level == LEVEL_CONTAINER) {
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);
if (mdfd < 0)
goto out_unlock;
sysfs_init(&info, mdfd, NULL);
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(stb.st_rdev);
dinfo.disk.minor = minor(stb.st_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 (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
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) != 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(stb.st_rdev);
info.disk.minor = minor(stb.st_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/", 8) == 0)
md_devname = chosen_name+8;
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 (info.array.level == LEVEL_CONTAINER) {
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");
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);
journal_device_missing = (info.journal_device_required) && (info.journal_clean == 0);
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 (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
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);
if (sra)
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;
mdu_array_info_t ra;
if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
return; /* not safe to remove from active arrays
* without thinking more */
for (d = sra->devs; d ; d = d->next) {
char dn[10];
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", "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;
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)
bestinfo->journal_clean = 1;
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 (!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)
{
mdu_array_info_t array;
int afd;
int max_degraded = 0;
for(; map; map = map->next) {
if (!metadata_container_matches(map->metadata, me->devnm))
continue;
afd = open_dev(map->devnm);
if (afd < 0)
continue;
/* most accurate information regarding array degradation */
if (ioctl(afd, GET_ARRAY_INFO, &array) >= 0) {
int degraded = array.raid_disks - array.active_disks -
array.spare_disks;
if (degraded > max_degraded)
max_degraded = degraded;
}
close(afd);
}
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;
struct stat stb;
struct map_ent *mp, *map = NULL;
struct mdinfo *chosen = NULL;
int dfd = *dfdp;
if (fstat(dfd, &stb) != 0)
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;
unsigned long long component_size = 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_DEGRADED|GET_COMPONENT|GET_VERSION);
if (!sra) {
/* Probably a container - no degraded info */
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;
}
if (!sra)
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)) {
component_size = st3->ss->min_acceptable_spare_size(st3);
st3->ss->free_super(st3);
}
free(st3);
close(mdfd);
}
if ((sra->component_size > 0 &&
st2->ss->avail_size(st2, devsize,
sra->devs
? sra->devs->data_offset
: INVALID_SECTORS)
< sra->component_size)
||
(sra->component_size == 0 && devsize < 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!! */
if (chosen)
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;
}