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mdadm/Assemble.c

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/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2016 Neil Brown <neilb@suse.com>
*
*
* 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>
*/
#include "mdadm.h"
#include <ctype.h>
mapping_t assemble_statuses[] = {
{ "but cannot be started", INCR_NO },
{ "but not safe to start", INCR_UNSAFE },
{ "and started", INCR_YES },
{ NULL, INCR_ALREADY }
};
/**
* struct assembly_array_info - General, meaningful information for assembly.
* @name: Array name.
* @new_cnt: Count of drives known to be members, recently added.
* @preexist_cnt: Count of member drives in pre-assembled array.
* @exp_cnt: Count of known expansion targets.
*
* FIXME: @exp_new_cnt for recently added expansion targets.
*/
struct assembly_array_info {
char *name;
int new_cnt;
int preexist_cnt;
int exp_cnt;
};
/**
* set_array_assembly_status() - generate status of assembly for an array.
* @c: Global settings.
* @result: Pointer to status mask.
* @status: Status to be set/printed.
* @arr: Array information.
*
* Print status message to user or set it in @result if it is not NULL.
*/
static void set_array_assembly_status(struct context *c,
int *result, int status,
struct assembly_array_info *arr)
{
int raid_disks = arr->preexist_cnt + arr->new_cnt;
char *status_msg = map_num_s(assemble_statuses, status);
if (c->export && result)
*result |= status;
if (c->export || c->verbose < 0)
return;
pr_err("%s has been assembled with %d device%s", arr->name,
raid_disks, raid_disks == 1 ? "":"s");
if (arr->preexist_cnt > 0)
fprintf(stderr, " (%d new)", arr->new_cnt);
if (arr->exp_cnt)
fprintf(stderr, " ( + %d for expansion)", arr->exp_cnt);
fprintf(stderr, " %s.\n", status_msg);
}
static int name_matches(char *found, char *required, char *homehost, int require_homehost)
{
/* See if the name found matches the required name, possibly
* prefixed with 'homehost'
*/
char *sep;
unsigned int l;
if (strcmp(found, required)==0)
return 1;
sep = strchr(found, ':');
if (!sep)
return 0;
l = sep - found;
if (strncmp(found, "any:", 4) == 0 ||
(homehost && strcmp(homehost, "any") == 0) ||
!require_homehost ||
(homehost && strlen(homehost) == l &&
strncmp(found, homehost, l) == 0)) {
/* matching homehost */
if (strcmp(sep+1, required) == 0)
return 1;
}
return 0;
}
static int is_member_busy(char *metadata_version)
{
/* check if the given member array is active */
struct mdstat_ent *mdstat = mdstat_read(0, 0);
struct mdstat_ent *ent;
int busy = 0;
for (ent = mdstat; ent; ent = ent->next) {
if (ent->metadata_version == NULL)
continue;
if (strncmp(ent->metadata_version, "external:", 9) != 0)
continue;
if (!is_subarray(&ent->metadata_version[9]))
continue;
/* Skip first char - it can be '/' or '-' */
if (strcmp(&ent->metadata_version[10], metadata_version+1) == 0) {
busy = 1;
break;
}
}
free_mdstat(mdstat);
return busy;
}
static int ident_matches(struct mddev_ident *ident,
struct mdinfo *content,
struct supertype *tst,
char *homehost, int require_homehost,
char *update, char *devname)
{
if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
same_uuid(content->uuid, ident->uuid, tst->ss->swapuuid)==0 &&
memcmp(content->uuid, uuid_zero, sizeof(int[4])) != 0) {
if (devname)
pr_err("%s has wrong uuid.\n", devname);
return 0;
}
if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
name_matches(content->name, ident->name, homehost, require_homehost)==0) {
if (devname)
pr_err("%s has wrong name.\n", devname);
return 0;
}
if (ident->super_minor != UnSet &&
ident->super_minor != content->array.md_minor) {
if (devname)
pr_err("%s has wrong super-minor.\n",
devname);
return 0;
}
if (ident->level != UnSet &&
ident->level != content->array.level) {
if (devname)
pr_err("%s has wrong raid level.\n",
devname);
return 0;
}
if (ident->raid_disks != UnSet &&
content->array.raid_disks != 0 && /* metadata doesn't know how many to expect */
ident->raid_disks!= content->array.raid_disks) {
if (devname)
pr_err("%s requires wrong number of drives.\n",
devname);
return 0;
}
if (ident->member && ident->member[0]) {
/* content->text_version must match */
char *s = strchr(content->text_version+1, '/');
if (s == NULL) {
if (devname)
pr_err("%s is not a container and one is required.\n",
devname);
return 0;
} else if (strcmp(ident->member, s+1) != 0) {
if (devname)
pr_err("skipping wrong member %s is %s\n",
content->text_version, devname);
return 0;
}
}
return 1;
}
static int select_devices(struct mddev_dev *devlist,
struct mddev_ident *ident,
struct supertype **stp,
struct mdinfo **contentp,
struct context *c,
int inargv, int auto_assem)
{
struct mddev_dev *tmpdev;
int num_devs;
struct supertype *st = *stp;
struct mdinfo *content = NULL;
int report_mismatch = ((inargv && c->verbose >= 0) || c->verbose > 0);
struct domainlist *domains = NULL;
dev_t rdev;
tmpdev = devlist; num_devs = 0;
while (tmpdev) {
if (tmpdev->used)
tmpdev->used = 2;
else
num_devs++;
tmpdev->disposition = 0;
tmpdev = tmpdev->next;
}
/* first walk the list of devices to find a consistent set
* that match the criterea, if that is possible.
* We flag the ones we like with 'used'.
*/
for (tmpdev = devlist;
tmpdev;
tmpdev = tmpdev ? tmpdev->next : NULL) {
char *devname = tmpdev->devname;
int dfd;
struct supertype *tst;
struct dev_policy *pol = NULL;
int found_container = 0;
if (tmpdev->used > 1)
continue;
if (ident->container) {
if (ident->container[0] == '/' &&
!same_dev(ident->container, devname)) {
if (report_mismatch)
pr_err("%s is not the container required (%s)\n",
devname, ident->container);
continue;
}
} else if (ident->devices &&
!match_oneof(ident->devices, devname)) {
/* Note that we ignore the "device=" identifier if a
* "container=" is given. Checking both is unnecessarily
* complicated.
*/
if (report_mismatch)
pr_err("%s is not one of %s\n", devname, ident->devices);
continue;
}
tst = dup_super(st);
dfd = dev_open(devname, O_RDONLY);
if (dfd < 0) {
if (report_mismatch)
pr_err("cannot open device %s: %s\n",
devname, strerror(errno));
tmpdev->used = 2;
} else if (!fstat_is_blkdev(dfd, devname, &rdev)) {
tmpdev->used = 2;
} else if (must_be_container(dfd)) {
if (st) {
/* already found some components, this cannot
* be another one.
*/
if (report_mismatch)
pr_err("%s is a container, but we are looking for components\n",
devname);
tmpdev->used = 2;
} if (!tst && (tst = super_by_fd(dfd, NULL)) == NULL) {
if (report_mismatch)
pr_err("not a recognisable container: %s\n",
devname);
tmpdev->used = 2;
} else if (!tst->ss->load_container ||
tst->ss->load_container(tst, dfd, NULL)) {
if (report_mismatch)
pr_err("no correct container type: %s\n",
devname);
tmpdev->used = 2;
} else if (auto_assem &&
!conf_test_metadata(tst->ss->name,
(pol = devid_policy(rdev)),
tst->ss->match_home(tst, c->homehost) == 1)) {
if (report_mismatch)
pr_err("%s has metadata type %s for which auto-assembly is disabled\n",
devname, tst->ss->name);
tmpdev->used = 2;
} else
found_container = 1;
} else {
if (!tst && (tst = guess_super(dfd)) == NULL) {
if (report_mismatch)
pr_err("no recogniseable superblock on %s\n",
devname);
tmpdev->used = 2;
} else if ((tst->ignore_hw_compat = 0),
tst->ss->load_super(tst, dfd,
report_mismatch ? devname : NULL)) {
if (report_mismatch)
pr_err("no RAID superblock on %s\n",
devname);
tmpdev->used = 2;
} else if (tst->ss->compare_super == NULL) {
if (report_mismatch)
pr_err("Cannot assemble %s metadata on %s\n",
tst->ss->name, devname);
tmpdev->used = 2;
} else if (auto_assem && st == NULL &&
!conf_test_metadata(tst->ss->name,
(pol = devid_policy(rdev)),
tst->ss->match_home(tst, c->homehost) == 1)) {
if (report_mismatch)
pr_err("%s has metadata type %s for which auto-assembly is disabled\n",
devname, tst->ss->name);
tmpdev->used = 2;
}
}
if (dfd >= 0) close(dfd);
if (tmpdev->used == 2) {
if (auto_assem || !inargv)
/* Ignore unrecognised devices during auto-assembly */
goto loop;
if (ident->name[0] ||
ident->super_minor != UnSet)
/* Ignore unrecognised device if looking for
* specific array */
goto loop;
if (ident->uuid_set)
/* ignore unrecognized device if looking for
* specific uuid
*/
goto loop;
pr_err("%s has no superblock - assembly aborted\n",
devname);
if (st)
st->ss->free_super(st);
dev_policy_free(pol);
domain_free(domains);
if (tst)
tst->ss->free_super(tst);
return -1;
}
if (found_container) {
/* tmpdev is a container. We need to be either
* looking for a member, or auto-assembling
*/
/* should be safe to try an exclusive open now, we
* have rejected anything that some other mdadm might
* be looking at
*/
dfd = dev_open(devname, O_RDONLY | O_EXCL);
if (dfd < 0) {
if (report_mismatch)
pr_err("%s is busy - skipping\n", devname);
goto loop;
}
close(dfd);
if (ident->container && ident->container[0] != '/') {
/* we have a uuid */
int uuid[4];
content = *contentp;
tst->ss->getinfo_super(tst, content, NULL);
if (!parse_uuid(ident->container, uuid) ||
!same_uuid(content->uuid, uuid, tst->ss->swapuuid)) {
if (report_mismatch)
pr_err("%s has wrong UUID to be required container\n",
devname);
goto loop;
}
}
/* It is worth looking inside this container.
*/
if (c->verbose > 0)
pr_err("looking in container %s\n",
devname);
for (content = tst->ss->container_content(tst, NULL);
content;
content = content->next) {
if (!ident_matches(ident, content, tst,
c->homehost, c->require_homehost,
c->update,
report_mismatch ? devname : NULL))
/* message already printed */;
else if (is_member_busy(content->text_version)) {
if (report_mismatch)
pr_err("member %s in %s is already assembled\n",
content->text_version,
devname);
} else if (content->array.state & (1<<MD_SB_BLOCK_VOLUME)) {
/* do not assemble arrays with unsupported configurations */
pr_err("Cannot activate member %s in %s.\n",
content->text_version,
devname);
} else
break;
}
if (!content) {
tmpdev->used = 2;
goto loop; /* empty container */
}
st = tst; tst = NULL;
if (!auto_assem && inargv && tmpdev->next != NULL) {
pr_err("%s is a container, but is not only device given: confused and aborting\n",
devname);
st->ss->free_super(st);
dev_policy_free(pol);
domain_free(domains);
return -1;
}
if (c->verbose > 0)
pr_err("found match on member %s in %s\n",
content->text_version, devname);
/* make sure we finished the loop */
tmpdev = NULL;
goto loop;
} else {
content = *contentp;
tst->ss->getinfo_super(tst, content, NULL);
if (!ident_matches(ident, content, tst,
c->homehost, c->require_homehost,
c->update,
report_mismatch ? devname : NULL))
goto loop;
if (auto_assem) {
/* Never auto-assemble things that conflict
* with mdadm.conf in some way
*/
struct mddev_ident *match;
int rv = 0;
match = conf_match(tst, content, devname,
report_mismatch ? c->verbose : -1,
&rv);
if (!match && rv == 2)
goto loop;
if (match && match->devname &&
strcasecmp(match->devname, "<ignore>") == 0) {
if (report_mismatch)
pr_err("%s is a member of an explicitly ignored array\n",
devname);
goto loop;
}
if (match && !ident_matches(match, content, tst,
c->homehost, c->require_homehost,
c->update,
report_mismatch ? devname : NULL))
/* Array exists in mdadm.conf but some
* details don't match, so reject it
*/
goto loop;
}
/* should be safe to try an exclusive open now, we
* have rejected anything that some other mdadm might
* be looking at
*/
dfd = dev_open(devname, O_RDONLY | O_EXCL);
if (dfd < 0) {
if (report_mismatch)
pr_err("%s is busy - skipping\n", devname);
goto loop;
}
close(dfd);
if (st == NULL)
st = dup_super(tst);
if (st->minor_version == -1)
st->minor_version = tst->minor_version;
if (memcmp(content->uuid, uuid_zero,
sizeof(int[4])) == 0) {
/* this is a floating spare. It cannot define
* an array unless there are no more arrays of
* this type to be found. It can be included
* in an array of this type though.
*/
tmpdev->used = 3;
goto loop;
}
if (st->ss != tst->ss ||
st->minor_version != tst->minor_version ||
st->ss->compare_super(st, tst, 1) != 0) {
/* Some mismatch. If exactly one array matches this host,
* we can resolve on that one.
* Or, if we are auto assembling, we just ignore the second
* for now.
*/
if (auto_assem)
goto loop;
if (c->homehost) {
int first = st->ss->match_home(st, c->homehost);
int last = tst->ss->match_home(tst, c->homehost);
if (first != last &&
(first == 1 || last == 1)) {
/* We can do something */
if (first) {/* just ignore this one */
if (report_mismatch)
pr_err("%s misses out due to wrong homehost\n",
devname);
goto loop;
} else { /* reject all those sofar */
struct mddev_dev *td;
if (report_mismatch)
pr_err("%s overrides previous devices due to good homehost\n",
devname);
for (td=devlist; td != tmpdev; td=td->next)
if (td->used == 1)
td->used = 0;
tmpdev->used = 1;
goto loop;
}
}
}
pr_err("superblock on %s doesn't match others - assembly aborted\n",
devname);
tst->ss->free_super(tst);
st->ss->free_super(st);
dev_policy_free(pol);
domain_free(domains);
return -1;
}
tmpdev->used = 1;
}
loop:
/* Collect domain information from members only */
if (tmpdev && tmpdev->used == 1) {
if (!pol)
pol = devid_policy(rdev);
domain_merge(&domains, pol, tst?tst->ss->name:NULL);
}
dev_policy_free(pol);
pol = NULL;
if (tst)
tst->ss->free_super(tst);
}
/* Check if we found some imsm spares but no members */
if ((auto_assem ||
(ident->uuid_set &&
memcmp(uuid_zero, ident->uuid,sizeof(uuid_zero)) == 0)) &&
(!st || !st->sb))
for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
if (tmpdev->used != 3)
continue;
tmpdev->used = 1;
content = *contentp;
if (!st->sb) {
/* we need sb from one of the spares */
int dfd = dev_open(tmpdev->devname, O_RDONLY);
if (dfd < 0 ||
st->ss->load_super(st, dfd, NULL))
tmpdev->used = 2;
close_fd(&dfd);
}
}
/* Now reject spares that don't match domains of identified members */
for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
if (tmpdev->used != 3)
continue;
if (!stat_is_blkdev(tmpdev->devname, &rdev)) {
tmpdev->used = 2;
} else {
struct dev_policy *pol = devid_policy(rdev);
int dt = domain_test(domains, pol, NULL);
if (inargv && dt != 0)
/* take this spare as domains match
* if there are any */
tmpdev->used = 1;
else if (!inargv && dt == 1)
/* device wasn't explicitly listed, so need
* explicit domain match - which we have */
tmpdev->used = 1;
else
/* if domains don't match mark as unused */
tmpdev->used = 0;
dev_policy_free(pol);
}
}
domain_free(domains);
*stp = st;
if (st && st->sb && content == *contentp)
st->ss->getinfo_super(st, content, NULL);
*contentp = content;
return num_devs;
}
struct devs {
char *devname;
int uptodate; /* set once we decide that this device is as
* recent as everything else in the array.
*/
int included; /* set if the device is already in the array
* due to a previous '-I'
*/
struct mdinfo i;
};
static int load_devices(struct devs *devices, char *devmap,
struct mddev_ident *ident, struct supertype **stp,
struct mddev_dev *devlist, struct context *c,
struct mdinfo *content,
int mdfd, char *mddev,
int *most_recentp, int *bestcntp, int **bestp,
int inargv)
{
struct mddev_dev *tmpdev;
int devcnt = 0;
int nextspare = 0;
int bitmap_done = 0;
int most_recent = -1;
int bestcnt = 0;
int *best = *bestp;
struct supertype *st = *stp;
for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) {
char *devname = tmpdev->devname;
struct stat stb;
struct supertype *tst;
int i;
int dfd;
int disk_state;
if (tmpdev->used != 1)
continue;
/* looks like a good enough match to update the super block if needed */
if (c->update) {
/* prepare useful information in info structures */
struct stat stb2;
int err;
fstat(mdfd, &stb2);
if (strcmp(c->update, "uuid") == 0 && !ident->uuid_set)
random_uuid((__u8 *)ident->uuid);
if (strcmp(c->update, "ppl") == 0 &&
ident->bitmap_fd >= 0) {
pr_err("PPL is not compatible with bitmap\n");
close(mdfd);
free(devices);
free(devmap);
return -1;
}
dfd = dev_open(devname,
tmpdev->disposition == 'I'
? O_RDWR : (O_RDWR|O_EXCL));
tst = dup_super(st);
if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
pr_err("cannot re-read metadata from %s - aborting\n",
devname);
if (dfd >= 0)
close(dfd);
close(mdfd);
free(devices);
free(devmap);
tst->ss->free_super(tst);
free(tst);
*stp = st;
return -1;
}
tst->ss->getinfo_super(tst, content, devmap + devcnt * content->array.raid_disks);
memcpy(content->uuid, ident->uuid, 16);
strcpy(content->name, ident->name);
content->array.md_minor = minor(stb2.st_rdev);
if (strcmp(c->update, "byteorder") == 0)
err = 0;
else if (strcmp(c->update, "home-cluster") == 0) {
tst->cluster_name = c->homecluster;
err = tst->ss->write_bitmap(tst, dfd, NameUpdate);
} else if (strcmp(c->update, "nodes") == 0) {
tst->nodes = c->nodes;
err = tst->ss->write_bitmap(tst, dfd, NodeNumUpdate);
} else if (strcmp(c->update, "revert-reshape") == 0 &&
c->invalid_backup)
err = tst->ss->update_super(tst, content,
"revert-reshape-nobackup",
devname, c->verbose,
ident->uuid_set,
c->homehost);
else
err = tst->ss->update_super(tst, content, c->update,
devname, c->verbose,
ident->uuid_set,
c->homehost);
if (err < 0) {
if (err == -1)
pr_err("--update=%s not understood for %s metadata\n",
c->update, tst->ss->name);
tst->ss->free_super(tst);
free(tst);
close(mdfd);
close(dfd);
free(devices);
free(devmap);
*stp = st;
return -1;
}
if (strcmp(c->update, "uuid")==0 &&
!ident->uuid_set) {
ident->uuid_set = 1;
memcpy(ident->uuid, content->uuid, 16);
}
if (tst->ss->store_super(tst, dfd))
pr_err("Could not re-write superblock on %s.\n",
devname);
if (strcmp(c->update, "uuid")==0 &&
ident->bitmap_fd >= 0 && !bitmap_done) {
if (bitmap_update_uuid(ident->bitmap_fd,
content->uuid,
tst->ss->swapuuid) != 0)
pr_err("Could not update uuid on external bitmap.\n");
else
bitmap_done = 1;
}
} else {
dfd = dev_open(devname,
tmpdev->disposition == 'I'
? O_RDWR : (O_RDWR|O_EXCL));
tst = dup_super(st);
if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
pr_err("cannot re-read metadata from %s - aborting\n",
devname);
if (dfd >= 0)
close(dfd);
close(mdfd);
free(devices);
free(devmap);
tst->ss->free_super(tst);
free(tst);
*stp = st;
return -1;
}
tst->ss->getinfo_super(tst, content, devmap + devcnt * content->array.raid_disks);
}
fstat(dfd, &stb);
close(dfd);
if (c->verbose > 0)
pr_err("%s is identified as a member of %s, slot %d%s.\n",
devname, mddev, content->disk.raid_disk,
(content->disk.state & (1<<MD_DISK_REPLACEMENT)) ? " replacement":"");
devices[devcnt].devname = devname;
devices[devcnt].uptodate = 0;
devices[devcnt].included = (tmpdev->disposition == 'I');
devices[devcnt].i = *content;
devices[devcnt].i.disk.major = major(stb.st_rdev);
devices[devcnt].i.disk.minor = minor(stb.st_rdev);
disk_state = devices[devcnt].i.disk.state & ~((1<<MD_DISK_FAILFAST) |
(1<<MD_DISK_WRITEMOSTLY));
if (disk_state == ((1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC))) {
if (most_recent < 0 ||
devices[devcnt].i.events
> devices[most_recent].i.events) {
struct supertype *tmp = tst;
tst = st;
st = tmp;
most_recent = devcnt;
}
}
tst->ss->free_super(tst);
free(tst);
if (content->array.level == LEVEL_MULTIPATH)
/* with multipath, the raid_disk from the superblock is meaningless */
i = devcnt;
else
i = devices[devcnt].i.disk.raid_disk;
if (i+1 == 0 || i == MD_DISK_ROLE_JOURNAL) {
if (nextspare < content->array.raid_disks*2)
nextspare = content->array.raid_disks*2;
i = nextspare++;
} else {
/* i is raid_disk - double it so there is room for
* replacements */
i *= 2;
if (devices[devcnt].i.disk.state & (1<<MD_DISK_REPLACEMENT))
i++;
if (i >= content->array.raid_disks*2 &&
i >= nextspare)
nextspare = i+1;
}
if (i < 10000) {
if (i >= bestcnt) {
int newbestcnt = i+10;
int *newbest = xmalloc(sizeof(int)*newbestcnt);
int c;
for (c=0; c < newbestcnt; c++)
if (c < bestcnt)
newbest[c] = best[c];
else
newbest[c] = -1;
if (best)free(best);
best = newbest;
bestcnt = newbestcnt;
}
if (best[i] >=0 &&
devices[best[i]].i.events ==
devices[devcnt].i.events &&
(devices[best[i]].i.disk.minor !=
devices[devcnt].i.disk.minor) &&
st->ss == &super0 &&
content->array.level != LEVEL_MULTIPATH) {
/* two different devices with identical superblock.
* Could be a mis-detection caused by overlapping
* partitions. fail-safe.
*/
pr_err("WARNING %s and %s appear to have very similar superblocks.\n"
" If they are really different, please --zero the superblock on one\n"
" If they are the same or overlap, please remove one from %s.\n",
devices[best[i]].devname, devname,
inargv ? "the list" :
"the\n DEVICE list in mdadm.conf"
);
close(mdfd);
free(devices);
free(devmap);
*stp = st;
return -1;
}
if (best[i] == -1 || (devices[best[i]].i.events
< devices[devcnt].i.events))
best[i] = devcnt;
else if (st->ss == &super_imsm)
best[i+1] = devcnt;
}
devcnt++;
}
if (most_recent >= 0)
*most_recentp = most_recent;
*bestcntp = bestcnt;
*bestp = best;
*stp = st;
return devcnt;
}
static int force_array(struct mdinfo *content,
struct devs *devices,
int *best, int bestcnt, char *avail,
int most_recent,
struct supertype *st,
struct context *c)
{
int okcnt = 0;
while (!enough(content->array.level, content->array.raid_disks,
content->array.layout, 1,
avail) ||
(content->reshape_active && content->delta_disks > 0 &&
!enough(content->array.level, (content->array.raid_disks
- content->delta_disks),
content->new_layout, 1, avail))) {
/* Choose the newest best drive which is
* not up-to-date, update the superblock
* and add it.
*/
int fd;
struct supertype *tst;
unsigned long long current_events;
int chosen_drive = -1;
int i;
for (i = 0;
i < content->array.raid_disks * 2 && i < bestcnt;
i += 2) {
int j = best[i];
if (j < 0)
continue;
if (devices[j].uptodate)
continue;
if (devices[j].i.recovery_start != MaxSector) {
int delta;
if (!devices[j].i.reshape_active ||
devices[j].i.delta_disks <= 0)
continue;
/* When increasing number of devices, an
* added device also appears to be
* recovering. It is safe to include it
* as long as it won't be a source of
* data.
* For now, just allow for last data
* devices in RAID4 or last devices in RAID4/5/6.
*/
delta = devices[j].i.delta_disks;
if (devices[j].i.array.level >= 4 &&
devices[j].i.array.level <= 6 &&
i/2 >= content->array.raid_disks - delta)
/* OK */;
else if (devices[j].i.array.level == 4 &&
i/2 >= content->array.raid_disks - delta - 1)
/* OK */;
else
continue;
} else if (devices[j].i.reshape_active !=
content->reshape_active ||
(devices[j].i.reshape_active &&
devices[j].i.reshape_progress !=
content->reshape_progress))
/* Here, it may be a source of data. If two
* devices claim different progresses, it
* means that reshape boundaries differ for
* their own devices. Kernel will only treat
* the first one as reshape progress and
* go on. It may cause disaster, so avoid it.
*/
continue;
if (chosen_drive < 0 ||
devices[j].i.events
> devices[chosen_drive].i.events)
chosen_drive = j;
}
if (chosen_drive < 0)
break;
current_events = devices[chosen_drive].i.events;
add_another:
if (c->verbose >= 0)
pr_err("forcing event count in %s(%d) from %d up to %d\n",
devices[chosen_drive].devname,
devices[chosen_drive].i.disk.raid_disk,
(int)(devices[chosen_drive].i.events),
(int)(devices[most_recent].i.events));
fd = dev_open(devices[chosen_drive].devname,
devices[chosen_drive].included ? O_RDWR
: (O_RDWR|O_EXCL));
if (fd < 0) {
pr_err("Couldn't open %s for write - not updating\n",
devices[chosen_drive].devname);
devices[chosen_drive].i.events = 0;
continue;
}
tst = dup_super(st);
if (tst->ss->load_super(tst,fd, NULL)) {
close(fd);
pr_err("RAID superblock disappeared from %s - not updating.\n",
devices[chosen_drive].devname);
devices[chosen_drive].i.events = 0;
continue;
}
content->events = devices[most_recent].i.events;
tst->ss->update_super(tst, content, "force-one",
devices[chosen_drive].devname, c->verbose,
0, NULL);
if (tst->ss->store_super(tst, fd)) {
close(fd);
pr_err("Could not re-write superblock on %s\n",
devices[chosen_drive].devname);
devices[chosen_drive].i.events = 0;
tst->ss->free_super(tst);
continue;
}
close(fd);
devices[chosen_drive].i.events = devices[most_recent].i.events;
devices[chosen_drive].uptodate = 1;
avail[chosen_drive] = 1;
okcnt++;
tst->ss->free_super(tst);
/* If there are any other drives of the same vintage,
* add them in as well. We can't lose and we might gain
*/
for (i = 0;
i < content->array.raid_disks * 2 && i < bestcnt ;
i += 2) {
int j = best[i];
if (j >= 0 &&
!devices[j].uptodate &&
devices[j].i.recovery_start == MaxSector &&
devices[j].i.events == current_events &&
((!devices[j].i.reshape_active &&
!content->reshape_active) ||
(devices[j].i.reshape_active ==
content->reshape_active &&
devices[j].i.reshape_progress ==
content->reshape_progress))) {
chosen_drive = j;
goto add_another;
}
}
}
return okcnt;
}
static int start_array(int mdfd,
char *mddev,
struct mdinfo *content,
struct supertype *st,
struct mddev_ident *ident,
int *best, int bestcnt,
int chosen_drive,
struct devs *devices,
unsigned int okcnt,
unsigned int sparecnt,
unsigned int rebuilding_cnt,
unsigned int journalcnt,
struct context *c,
int clean, char *avail,
int start_partial_ok,
int err_ok,
int was_forced
)
{
int rv;
int i;
unsigned int req_cnt;
if (content->journal_device_required && (content->journal_clean == 0)) {
if (!c->force) {
pr_err("Not safe to assemble with missing or stale journal device, consider --force.\n");
return 1;
}
pr_err("Journal is missing or stale, starting array read only.\n");
c->readonly = 1;
}
if (content->consistency_policy == CONSISTENCY_POLICY_PPL)
clean = 1;
rv = set_array_info(mdfd, st, content);
if (rv && !err_ok) {
pr_err("failed to set array info for %s: %s\n",
mddev, strerror(errno));
return 1;
}
if (ident->bitmap_fd >= 0) {
if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
pr_err("SET_BITMAP_FILE failed.\n");
return 1;
}
} else if (ident->bitmap_file) {
/* From config file */
int bmfd = open(ident->bitmap_file, O_RDWR);
if (bmfd < 0) {
pr_err("Could not open bitmap file %s\n",
ident->bitmap_file);
return 1;
}
if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
pr_err("Failed to set bitmapfile for %s\n", mddev);
close(bmfd);
return 1;
}
close(bmfd);
}
/* First, add the raid disks, but add the chosen one last */
for (i = 0; i <= bestcnt; i++) {
int j;
if (i < bestcnt) {
j = best[i];
if (j == chosen_drive)
continue;
} else
j = chosen_drive;
if (j >= 0 && !devices[j].included) {
int dfd;
dfd = dev_open(devices[j].devname, O_RDWR|O_EXCL);
if (dfd >= 0) {
remove_partitions(dfd);
close(dfd);
}
rv = add_disk(mdfd, st, content, &devices[j].i);
if (rv) {
pr_err("failed to add %s to %s: %s\n",
devices[j].devname, mddev,
strerror(errno));
if (errno == EINVAL && content->array.level == 0 &&
content->array.layout != 0) {
cont_err("Possibly your kernel doesn't support RAID0 layouts.\n");
cont_err("Please upgrade.\n");
}
if (i < content->array.raid_disks * 2 ||
i == bestcnt)
okcnt--;
else
sparecnt--;
} else if (c->verbose > 0) {
pr_err("added %s to %s as %d%s%s\n",
devices[j].devname, mddev,
devices[j].i.disk.raid_disk,
devices[j].uptodate?"":
" (possibly out of date)",
(devices[j].i.disk.state &
(1<<MD_DISK_REPLACEMENT)) ?
" replacement":"");
}
} else if (j >= 0) {
if (c->verbose > 0)
pr_err("%s is already in %s as %d\n",
devices[j].devname, mddev,
devices[j].i.disk.raid_disk);
} else if (c->verbose > 0 &&
i < content->array.raid_disks * 2 && (i & 1) == 0)
pr_err("no uptodate device for slot %d of %s\n",
i/2, mddev);
}
if (content->array.level == LEVEL_CONTAINER) {
sysfs_rules_apply(mddev, content);
if (c->verbose >= 0) {
pr_err("Container %s has been assembled with %d drive%s",
mddev, okcnt + sparecnt + journalcnt,
okcnt + sparecnt + journalcnt == 1 ? "" : "s");
if (okcnt < (unsigned)content->array.raid_disks)
fprintf(stderr, " (out of %d)\n",
content->array.raid_disks);
else
fprintf(stderr, "\n");
}
if (st->ss->validate_container) {
struct mdinfo *devices_list;
struct mdinfo *info_devices;
unsigned int count;
devices_list = NULL;
info_devices = xmalloc(sizeof(struct mdinfo) *
(okcnt + sparecnt));
for (count = 0; count < okcnt + sparecnt; count++) {
info_devices[count] = devices[count].i;
info_devices[count].next = devices_list;
devices_list = &info_devices[count];
}
if (st->ss->validate_container(devices_list))
pr_err("Mismatch detected!\n");
free(info_devices);
}
st->ss->free_super(st);
sysfs_uevent(content, "change");
if (err_ok && okcnt < (unsigned)content->array.raid_disks)
/* Was partial, is still partial, so signal an error
* to ensure we don't retry */
return 1;
return 0;
}
/* Get number of in-sync devices according to the superblock.
* We must have this number to start the array without -s or -R
*/
req_cnt = content->array.working_disks;
if (c->runstop == 1 ||
(c->runstop <= 0 &&
(enough(content->array.level, content->array.raid_disks,
content->array.layout, clean, avail) &&
(okcnt + rebuilding_cnt >= req_cnt || start_partial_ok)))) {
/* This array is good-to-go.
* If a reshape is in progress then we might need to
* continue monitoring it. In that case we start
* it read-only and let the grow code make it writable.
*/
int rv;
if (content->reshape_active &&
!(content->reshape_active & RESHAPE_NO_BACKUP) &&
content->delta_disks <= 0) {
if (!c->backup_file) {
pr_err("%s: Need a backup file to complete reshape of this array.\n",
mddev);
pr_err("Please provided one with \"--backup-file=...\"\n");
if (c->update &&
strcmp(c->update, "revert-reshape") == 0)
pr_err("(Don't specify --update=revert-reshape again, that part succeeded.)\n");
return 1;
}
rv = sysfs_set_str(content, NULL,
"array_state", "readonly");
if (rv == 0)
rv = Grow_continue(mdfd, st, content,
c->backup_file, 0,
c->freeze_reshape);
} else if (c->readonly &&
sysfs_attribute_available(content, NULL,
"array_state")) {
rv = sysfs_set_str(content, NULL,
"array_state", "readonly");
} else
rv = ioctl(mdfd, RUN_ARRAY, NULL);
reopen_mddev(mdfd); /* drop O_EXCL */
if (rv == 0) {
sysfs_rules_apply(mddev, content);
if (c->verbose >= 0) {
pr_err("%s has been started with %d drive%s",
mddev, okcnt, okcnt==1?"":"s");
if (okcnt < (unsigned)content->array.raid_disks)
fprintf(stderr, " (out of %d)",
content->array.raid_disks);
if (rebuilding_cnt)
fprintf(stderr, "%s %d rebuilding",
sparecnt?",":" and",
rebuilding_cnt);
if (sparecnt)
fprintf(stderr, " and %d spare%s",
sparecnt,
sparecnt == 1 ? "" : "s");
if (content->journal_clean)
fprintf(stderr, " and %d journal",
journalcnt);
fprintf(stderr, ".\n");
}
if (content->reshape_active &&
content->array.level >= 4 &&
content->array.level <= 6) {
/* might need to increase the size
* of the stripe cache - default is 256
*/
int chunk_size = content->array.chunk_size;
if (content->reshape_active &&
content->new_chunk > chunk_size)
chunk_size = content->new_chunk;
if (256 < 4 * ((chunk_size+4065)/4096)) {
struct mdinfo *sra;
sra = sysfs_read(mdfd, NULL, 0);
if (sra)
sysfs_set_num(sra, NULL,
"stripe_cache_size",
(4 * chunk_size / 4096) + 1);
sysfs_free(sra);
}
}
if (okcnt < (unsigned)content->array.raid_disks) {
/* If any devices did not get added
* because the kernel rejected them based
* on event count, try adding them
* again providing the action policy is
* 're-add' or greater. The bitmap
* might allow them to be included, or
* they will become spares.
*/
for (i = 0; i < bestcnt; i++) {
int j = best[i];
if (j >= 0 && !devices[j].uptodate) {
if (!disk_action_allows(&devices[j].i, st->ss->name, act_re_add))
continue;
rv = add_disk(mdfd, st, content,
&devices[j].i);
if (rv == 0 && c->verbose >= 0)
pr_err("%s has been re-added.\n",
devices[j].devname);
}
}
}
if (content->array.level == 6 &&
okcnt + 1 == (unsigned)content->array.raid_disks &&
was_forced) {
struct mdinfo *sra;
sra = sysfs_read(mdfd, NULL, 0);
if (sra)
sysfs_set_str(sra, NULL,
"sync_action", "repair");
sysfs_free(sra);
}
return 0;
}
pr_err("failed to RUN_ARRAY %s: %s\n", mddev, strerror(errno));
if (errno == 524 /* ENOTSUP */ &&
content->array.level == 0 && content->array.layout == 0)
cont_err("Please use --update=layout-original or --update=layout-alternate\n");
if (!enough(content->array.level, content->array.raid_disks,
content->array.layout, 1, avail))
pr_err("Not enough devices to start the array.\n");
else if (!enough(content->array.level,
content->array.raid_disks,
content->array.layout, clean, avail))
pr_err("Not enough devices to start the array while not clean - consider --force.\n");
return 1;
}
if (c->runstop == -1) {
pr_err("%s assembled from %d drive%s",
mddev, okcnt, okcnt == 1 ? "" : "s");
if (okcnt != (unsigned)content->array.raid_disks)
fprintf(stderr, " (out of %d)",
content->array.raid_disks);
fprintf(stderr, ", but not started.\n");
return 2;
}
if (c->verbose >= -1) {
pr_err("%s assembled from %d drive%s",
mddev, okcnt, okcnt == 1 ? "" : "s");
if (rebuilding_cnt)
fprintf(stderr, "%s %d rebuilding",
sparecnt ? "," : " and", rebuilding_cnt);
if (sparecnt)
fprintf(stderr, " and %d spare%s", sparecnt,
sparecnt == 1 ? "" : "s");
if (!enough(content->array.level, content->array.raid_disks,
content->array.layout, 1, avail))
fprintf(stderr, " - not enough to start the array.\n");
else if (!enough(content->array.level,
content->array.raid_disks,
content->array.layout, clean, avail))
fprintf(stderr, " - not enough to start the array while not clean - consider --force.\n");
else {
if (req_cnt == (unsigned)content->array.raid_disks)
fprintf(stderr, " - need all %d to start it",
req_cnt);
else
fprintf(stderr, " - need %d to start", req_cnt);
fprintf(stderr, " (use --run to insist).\n");
}
}
return 1;
}
int Assemble(struct supertype *st, char *mddev,
struct mddev_ident *ident,
struct mddev_dev *devlist,
struct context *c)
{
/*
* The task of Assemble is to find a collection of
* devices that should (according to their superblocks)
* form an array, and to give this collection to the MD driver.
* In Linux-2.4 and later, this involves submitting a
* SET_ARRAY_INFO ioctl with no arg - to prepare
* the array - and then submit a number of
* ADD_NEW_DISK ioctls to add disks into
* the array. Finally RUN_ARRAY might
* be submitted to start the array.
*
* Much of the work of Assemble is in finding and/or
* checking the disks to make sure they look right.
*
* If mddev is not set, then scan must be set and we
* read through the config file for dev+uuid mapping
* We recurse, setting mddev, for each device that
* - isn't running
* - has a valid uuid (or any uuid if !uuidset)
*
* If mddev is set, we try to determine state of md.
* check version - must be at least 0.90.0
* check kernel version. must be at least 2.4.
* If not, we can possibly fall back on START_ARRAY
* Try to GET_ARRAY_INFO.
* If possible, give up
* If not, try to STOP_ARRAY just to make sure
*
* If !uuidset and scan, look in conf-file for uuid
* If not found, give up
* If !devlist and scan and uuidset, get list of devs from conf-file
*
* For each device:
* Check superblock - discard if bad
* Check uuid (set if we don't have one) - discard if no match
* Check superblock similarity if we have a superblock - discard if different
* Record events, devicenum
* This should give us a list of devices for the array
* We should collect the most recent event number
*
* Count disks with recent enough event count
* While force && !enough disks
* Choose newest rejected disks, update event count
* mark clean and rewrite superblock
* If recent kernel:
* SET_ARRAY_INFO
* foreach device with recent events : ADD_NEW_DISK
* if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
* If old kernel:
* Check the device numbers in superblock are right
* update superblock if any changes
* START_ARRAY
*
*/
int rv = -1;
int mdfd = -1;
int clean;
int auto_assem = (mddev == NULL && !ident->uuid_set &&
ident->super_minor == UnSet && ident->name[0] == 0 &&
(ident->container == NULL || ident->member == NULL));
struct devs *devices = NULL;
char *devmap;
int *best = NULL; /* indexed by raid_disk */
int bestcnt = 0;
int devcnt;
unsigned int okcnt, sparecnt, rebuilding_cnt, replcnt, journalcnt;
int journal_clean = 0;
int i;
int was_forced = 0;
int most_recent = 0;
int chosen_drive;
int change = 0;
int inargv = 0;
int start_partial_ok = (c->runstop >= 0) &&
(c->force || devlist==NULL || auto_assem);
int num_devs;
struct mddev_dev *tmpdev;
struct mdinfo info;
struct mdinfo *content = NULL;
struct mdinfo *pre_exist = NULL;
char *avail;
char *name = NULL;
char chosen_name[1024];
struct map_ent *map = NULL;
struct map_ent *mp;
/*
* If any subdevs are listed, then any that don't
* match ident are discarded. Remainder must all match and
* become the array.
* If no subdevs, then we scan all devices in the config file, but
* there must be something in the identity
*/
if (!devlist &&
ident->uuid_set == 0 &&
(ident->super_minor < 0 || ident->super_minor == UnSet) &&
ident->name[0] == 0 &&
(ident->container == NULL || ident->member == NULL) &&
ident->devices == NULL) {
pr_err("No identity information available for %s - cannot assemble.\n",
mddev ? mddev : "further assembly");
return 1;
}
if (devlist == NULL)
devlist = conf_get_devs();
else if (mddev)
inargv = 1;
try_again:
/* We come back here when doing auto-assembly and attempting some
* set of devices failed. Those are now marked as ->used==2 and
* we ignore them and try again
*/
if (!st && ident->st)
st = ident->st;
if (c->verbose>0)
pr_err("looking for devices for %s\n",
mddev ? mddev : "further assembly");
content = &info;
if (st && c->force)
st->ignore_hw_compat = 1;
num_devs = select_devices(devlist, ident, &st, &content, c,
inargv, auto_assem);
if (num_devs < 0)
return 1;
if (!st || !st->sb || !content)
return 2;
/* We have a full set of devices - we now need to find the
* array device.
* However there is a risk that we are racing with "mdadm -I"
* and the array is already partially assembled - we will have
* rejected any devices already in this address.
* So we take a lock on the map file - to prevent further races -
* and look for the uuid in there. If found and the array is
* active, we abort. If found and the array is not active
* we commit to that md device and add all the contained devices
* to our list. We flag them so that we don't try to re-add,
* but can remove if they turn out to not be wanted.
*/
if (map_lock(&map))
pr_err("failed to get exclusive lock on mapfile - continue anyway...\n");
if (c->update && strcmp(c->update,"uuid") == 0)
mp = NULL;
else
mp = map_by_uuid(&map, content->uuid);
if (mp) {
struct mdinfo *dv;
/* array already exists. */
pre_exist = sysfs_read(-1, mp->devnm, GET_LEVEL|GET_DEVS);
if (pre_exist->array.level != UnSet) {
pr_err("Found some drive for an array that is already active: %s\n",
mp->path);
pr_err("giving up.\n");
goto out;
}
for (dv = pre_exist->devs; dv; dv = dv->next) {
/* We want to add this device to our list,
* but it could already be there if "mdadm -I"
* started *after* we checked for O_EXCL.
* If we add it to the top of the list
* it will be preferred over later copies.
*/
struct mddev_dev *newdev;
char *devname = map_dev(dv->disk.major,
dv->disk.minor,
0);
if (!devname)
continue;
newdev = xmalloc(sizeof(*newdev));
newdev->devname = devname;
newdev->disposition = 'I';
newdev->used = 1;
newdev->next = devlist;
devlist = newdev;
num_devs++;
}
strcpy(chosen_name, mp->path);
if (c->verbose > 0 || mddev == NULL ||
strcmp(mddev, chosen_name) != 0)
pr_err("Merging with already-assembled %s\n",
chosen_name);
mdfd = open_dev_excl(mp->devnm);
} else {
int trustworthy = FOREIGN;
name = content->name;
switch (st->ss->match_home(st, c->homehost)
?: st->ss->match_home(st, "any")) {
case 1:
trustworthy = LOCAL;
name = strchr(content->name, ':');
if (name)
name++;
else
name = content->name;
break;
}
if (mddev && map_by_name(&map, mddev) != NULL) {
pr_err("Cannot create device with %s because is in use\n", mddev);
goto out;
}
if (!auto_assem)
/* If the array is listed in mdadm.conf or on
* command line, then we trust the name
* even if the array doesn't look local
*/
trustworthy = LOCAL;
if (name[0] == 0 &&
content->array.level == LEVEL_CONTAINER) {
name = content->text_version;
trustworthy = METADATA;
}
if (name[0] && trustworthy != LOCAL &&
! c->require_homehost &&
conf_name_is_free(name))
trustworthy = LOCAL;
if (trustworthy == LOCAL &&
strchr(name, ':'))
/* Ignore 'host:' prefix of name */
name = strchr(name, ':')+1;
mdfd = create_mddev(mddev, name, ident->autof, trustworthy,
chosen_name, 0);
}
if (mdfd < 0) {
st->ss->free_super(st);
if (auto_assem)
goto try_again;
goto out;
}
mddev = chosen_name;
if (pre_exist == NULL) {
if (mddev_busy(fd2devnm(mdfd))) {
pr_err("%s already active, cannot restart it!\n",
mddev);
for (tmpdev = devlist ;
tmpdev && tmpdev->used != 1;
tmpdev = tmpdev->next)
;
if (tmpdev && auto_assem)
pr_err("%s needed for %s...\n",
mddev, tmpdev->devname);
close(mdfd);
mdfd = -3;
st->ss->free_super(st);
if (auto_assem)
goto try_again;
goto out;
}
/* just incase it was started but has no content */
ioctl(mdfd, STOP_ARRAY, NULL);
}
if (content != &info) {
/* This is a member of a container. Try starting the array. */
int err;
err = assemble_container_content(st, mdfd, content, c,
chosen_name, NULL);
close(mdfd);
return err;
}
/* Ok, no bad inconsistancy, we can try updating etc */
devices = xcalloc(num_devs, sizeof(*devices));
devmap = xcalloc(num_devs, content->array.raid_disks);
devcnt = load_devices(devices, devmap, ident, &st, devlist,
c, content, mdfd, mddev,
&most_recent, &bestcnt, &best, inargv);
if (devcnt < 0) {
mdfd = -3;
/*
* devices is already freed in load_devices, so set devices
* to NULL to avoid double free devices.
*/
devices = NULL;
goto out;
}
if (devcnt == 0) {
pr_err("no devices found for %s\n",
mddev);
if (st)
st->ss->free_super(st);
free(devmap);
goto out;
}
if (c->update && strcmp(c->update, "byteorder")==0)
st->minor_version = 90;
st->ss->getinfo_super(st, content, NULL);
clean = content->array.state & 1;
/* now we have some devices that might be suitable.
* I wonder how many
*/
avail = xcalloc(content->array.raid_disks, 1);
okcnt = 0;
replcnt = 0;
sparecnt=0;
journalcnt=0;
rebuilding_cnt=0;
for (i=0; i< bestcnt; i++) {
int j = best[i];
int event_margin = 1; /* always allow a difference of '1'
* like the kernel does
*/
if (j < 0) continue;
/* note: we ignore error flags in multipath arrays
* as they don't make sense
*/
if (content->array.level != LEVEL_MULTIPATH) {
if (devices[j].i.disk.state & (1<<MD_DISK_JOURNAL)) {
if (content->journal_device_required)
journalcnt++;
else /* unexpected journal, mark as faulty */
devices[j].i.disk.state |= (1<<MD_DISK_FAULTY);
} else if (!(devices[j].i.disk.state & (1<<MD_DISK_ACTIVE))) {
if (!(devices[j].i.disk.state
& (1<<MD_DISK_FAULTY))) {
devices[j].uptodate = 1;
sparecnt++;
}
continue;
}
}
/* If this device thinks that 'most_recent' has failed, then
* we must reject this device.
*/
if (j != most_recent && !c->force &&
content->array.raid_disks > 0 &&
devices[most_recent].i.disk.raid_disk >= 0 &&
devmap[j * content->array.raid_disks + devices[most_recent].i.disk.raid_disk] == 0) {
if (c->verbose > -1)
pr_err("ignoring %s as it reports %s as failed\n",
devices[j].devname, devices[most_recent].devname);
best[i] = -1;
continue;
}
/* Require event counter to be same as, or just less than,
* most recent. If it is bigger, it must be a stray spare and
* should be ignored.
*/
if (devices[j].i.events+event_margin >=
devices[most_recent].i.events &&
devices[j].i.events <=
devices[most_recent].i.events
) {
devices[j].uptodate = 1;
if (devices[j].i.disk.state & (1<<MD_DISK_JOURNAL))
journal_clean = 1;
if (i < content->array.raid_disks * 2) {
if (devices[j].i.recovery_start == MaxSector ||
(content->reshape_active &&
i >= content->array.raid_disks - content->delta_disks)) {
if (!avail[i/2]) {
okcnt++;
avail[i/2]=1;
} else
replcnt++;
} else
rebuilding_cnt++;
} else if (devices[j].i.disk.raid_disk != MD_DISK_ROLE_JOURNAL)
sparecnt++;
}
}
free(devmap);
if (c->force) {
int force_ok = force_array(content, devices, best, bestcnt,
avail, most_recent, st, c);
okcnt += force_ok;
if (force_ok)
was_forced = 1;
}
/* Now we want to look at the superblock which the kernel will base things on
* and compare the devices that we think are working with the devices that the
* superblock thinks are working.
* If there are differences and --force is given, then update this chosen
* superblock.
*/
chosen_drive = -1;
st->ss->free_super(st);
for (i=0; chosen_drive < 0 && i<bestcnt; i+=2) {
int j = best[i];
int fd;
if (j<0)
continue;
if (!devices[j].uptodate)
continue;
if (devices[j].i.events < devices[most_recent].i.events)
continue;
chosen_drive = j;
if ((fd=dev_open(devices[j].devname,
devices[j].included ? O_RDONLY
: (O_RDONLY|O_EXCL)))< 0) {
pr_err("Cannot open %s: %s\n",
devices[j].devname, strerror(errno));
goto out;
}
if (st->ss->load_super(st,fd, NULL)) {
close(fd);
pr_err("RAID superblock has disappeared from %s\n",
devices[j].devname);
goto out;
}
close(fd);
}
if (st->sb == NULL) {
pr_err("No suitable drives found for %s\n", mddev);
goto out;
}
st->ss->getinfo_super(st, content, NULL);
if (sysfs_init(content, mdfd, NULL)) {
pr_err("Unable to initialize sysfs\n");
goto out;
}
/* after reload context, store journal_clean in context */
content->journal_clean = journal_clean;
for (i=0; i<bestcnt; i++) {
int j = best[i];
unsigned int desired_state;
if (j < 0)
continue;
if (devices[j].i.disk.raid_disk == MD_DISK_ROLE_JOURNAL)
desired_state = (1<<MD_DISK_JOURNAL);
else if (i >= content->array.raid_disks * 2)
desired_state = 0;
else if (i & 1)
desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_REPLACEMENT);
else
desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
desired_state |= devices[j].i.disk.state & ((1<<MD_DISK_FAILFAST) |
(1<<MD_DISK_WRITEMOSTLY));
if (!devices[j].uptodate)
continue;
devices[j].i.disk.state = desired_state;
if (!(devices[j].i.array.state & 1))
clean = 0;
if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
c->verbose, 0, NULL)) {
if (c->force) {
if (c->verbose >= 0)
pr_err("clearing FAULTY flag for device %d in %s for %s\n",
j, mddev, devices[j].devname);
change = 1;
} else {
if (c->verbose >= -1)
pr_err("device %d in %s has wrong state in superblock, but %s seems ok\n",
i, mddev, devices[j].devname);
}
}
#if 0
if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
pr_err("devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
i, mddev);
}
#endif
}
if (c->force && !clean &&
!enough(content->array.level, content->array.raid_disks,
content->array.layout, clean,
avail)) {
change += st->ss->update_super(st, content, "force-array",
devices[chosen_drive].devname, c->verbose,
0, NULL);
was_forced = 1;
clean = 1;
}
if (change) {
int fd;
fd = dev_open(devices[chosen_drive].devname,
devices[chosen_drive].included ?
O_RDWR : (O_RDWR|O_EXCL));
if (fd < 0) {
pr_err("Could not open %s for write - cannot Assemble array.\n",
devices[chosen_drive].devname);
goto out;
}
if (st->ss->store_super(st, fd)) {
close(fd);
pr_err("Could not re-write superblock on %s\n",
devices[chosen_drive].devname);
goto out;
}
if (c->verbose >= 0)
pr_err("Marking array %s as 'clean'\n",
mddev);
close(fd);
}
/* If we are in the middle of a reshape we may need to restore saved data
* that was moved aside due to the reshape overwriting live data
* The code of doing this lives in Grow.c
*/
if (content->reshape_active &&
!(content->reshape_active & RESHAPE_NO_BACKUP)) {
int err = 0;
int *fdlist = xmalloc(sizeof(int)* bestcnt);
if (c->verbose > 0)
pr_err("%s has an active reshape - checking if critical section needs to be restored\n",
chosen_name);
if (!c->backup_file)
c->backup_file = locate_backup(content->sys_name);
enable_fds(bestcnt/2);
for (i = 0; i < bestcnt/2; i++) {
int j = best[i*2];
if (j >= 0) {
fdlist[i] = dev_open(devices[j].devname,
devices[j].included
? O_RDWR : (O_RDWR|O_EXCL));
if (fdlist[i] < 0) {
pr_err("Could not open %s for write - cannot Assemble array.\n",
devices[j].devname);
err = 1;
break;
}
} else
fdlist[i] = -1;
}
if (!err) {
if (st->ss->external && st->ss->recover_backup)
err = st->ss->recover_backup(st, content);
else
err = Grow_restart(st, content, fdlist, bestcnt/2,
c->backup_file, c->verbose > 0);
if (err && c->invalid_backup) {
if (c->verbose > 0)
pr_err("continuing without restoring backup\n");
err = 0;
}
}
while (i>0) {
i--;
if (fdlist[i]>=0) close(fdlist[i]);
}
free(fdlist);
if (err) {
pr_err("Failed to restore critical section for reshape, sorry.\n");
if (c->backup_file == NULL)
cont_err("Possibly you needed to specify the --backup-file\n");
goto out;
}
}
/* Almost ready to actually *do* something */
/* First, fill in the map, so that udev can find our name
* as soon as we become active.
*/
if (c->update && strcmp(c->update, "metadata")==0) {
content->array.major_version = 1;
content->array.minor_version = 0;
strcpy(content->text_version, "1.0");
}
map_update(&map, fd2devnm(mdfd), content->text_version,
content->uuid, chosen_name);
rv = start_array(mdfd, mddev, content,
st, ident, best, bestcnt,
chosen_drive, devices, okcnt, sparecnt,
rebuilding_cnt, journalcnt,
c,
clean, avail, start_partial_ok,
pre_exist != NULL,
was_forced);
if (rv == 1 && !pre_exist)
ioctl(mdfd, STOP_ARRAY, NULL);
free(devices);
out:
map_unlock(&map);
if (rv == 0) {
wait_for(chosen_name, mdfd);
close(mdfd);
if (auto_assem) {
int usecs = 1;
/* There is a nasty race with 'mdadm --monitor'.
* If it opens this device before we close it,
* it gets an incomplete open on which IO
* doesn't work and the capacity is
* wrong.
* If we reopen (to check for layered devices)
* before --monitor closes, we loose.
*
* So: wait upto 1 second for there to be
* a non-zero capacity.
*/
while (usecs < 1000) {
mdfd = open(mddev, O_RDONLY);
if (mdfd >= 0) {
unsigned long long size;
if (get_dev_size(mdfd, NULL, &size) &&
size > 0)
break;
close(mdfd);
}
usleep(usecs);
usecs <<= 1;
}
}
} else if (mdfd >= 0)
close(mdfd);
/* '2' means 'OK, but not started yet' */
if (rv == -1) {
free(devices);
return 1;
}
return rv == 2 ? 0 : rv;
}
int assemble_container_content(struct supertype *st, int mdfd,
struct mdinfo *content, struct context *c,
char *chosen_name, int *result)
{
struct mdinfo *dev, *sra, *dev2;
struct assembly_array_info array = {chosen_name, 0, 0, 0};
int old_raid_disks;
int start_reshape;
char *avail;
int err;
int is_raid456, is_clean, all_disks;
if (sysfs_init(content, mdfd, NULL)) {
pr_err("Unable to initialize sysfs\n");
return 1;
}
sra = sysfs_read(mdfd, NULL, GET_VERSION|GET_DEVS);
if (sra == NULL || strcmp(sra->text_version, content->text_version) != 0) {
if (content->array.major_version == -1 &&
content->array.minor_version == -2 &&
c->readonly &&
content->text_version[0] == '/')
content->text_version[0] = '-';
if (sysfs_set_array(content, 9003) != 0) {
sysfs_free(sra);
return 1;
}
}
/* There are two types of reshape: container wide or sub-array specific
* Check if metadata requests blocking container wide reshapes
*/
start_reshape = (content->reshape_active &&
!((content->reshape_active == CONTAINER_RESHAPE) &&
(content->array.state & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))));
/* Block subarray here if it is under reshape now
* Do not allow for any changes in this array
*/
if (st->ss->external && content->recovery_blocked && start_reshape)
block_subarray(content);
for (dev2 = sra->devs; dev2; dev2 = dev2->next) {
for (dev = content->devs; dev; dev = dev->next)
if (dev2->disk.major == dev->disk.major &&
dev2->disk.minor == dev->disk.minor)
break;
if (dev)
continue;
/* Don't want this one any more */
if (sysfs_set_str(sra, dev2, "slot", "none") < 0 &&
errno == EBUSY) {
pr_err("Cannot remove old device %s: not updating %s\n", dev2->sys_name, sra->sys_name);
sysfs_free(sra);
return 1;
}
sysfs_set_str(sra, dev2, "state", "remove");
}
old_raid_disks = content->array.raid_disks - content->delta_disks;
avail = xcalloc(content->array.raid_disks, 1);
for (dev = content->devs; dev; dev = dev->next) {
if (dev->disk.raid_disk >= 0)
avail[dev->disk.raid_disk] = 1;
if (sysfs_add_disk(content, dev, 1) == 0) {
if (dev->disk.raid_disk >= old_raid_disks &&
content->reshape_active)
array.exp_cnt++;
else
array.new_cnt++;
} else if (errno == EEXIST)
array.preexist_cnt++;
}
sysfs_free(sra);
all_disks = array.new_cnt + array.exp_cnt + array.preexist_cnt;
map_update(NULL, fd2devnm(mdfd), content->text_version,
content->uuid, chosen_name);
if (content->consistency_policy == CONSISTENCY_POLICY_PPL &&
st->ss->validate_ppl) {
content->array.state |= 1;
err = 0;
for (dev = content->devs; dev; dev = dev->next) {
int dfd;
char *devpath;
int ret;
ret = st->ss->validate_ppl(st, content, dev);
if (ret == 0)
continue;
if (ret < 0) {
err = 1;
break;
}
if (!c->force) {
pr_err("%s contains invalid PPL - consider --force or --update-subarray with --update=no-ppl\n",
chosen_name);
content->array.state &= ~1;
avail[dev->disk.raid_disk] = 0;
break;
}
/* have --force - overwrite the invalid ppl */
devpath = map_dev(dev->disk.major, dev->disk.minor, 0);
dfd = dev_open(devpath, O_RDWR);
if (dfd < 0) {
pr_err("Failed to open %s\n", devpath);
err = 1;
break;
}
err = st->ss->write_init_ppl(st, content, dfd);
close(dfd);
if (err)
break;
}
if (err) {
free(avail);
return err;
}
} else if (c->force) {
/* Set the array as 'clean' so that we can proceed with starting
* it even if we don't have all devices. Mdmon doesn't care
* if the dirty flag is set in metadata, it will start managing
* it anyway.
* This is really important for raid456 (RWH case), other levels
* are started anyway.
*/
content->array.state |= 1;
}
is_raid456 = (content->array.level >= 4 && content->array.level <= 6);
is_clean = content->array.state & 1;
if (enough(content->array.level, content->array.raid_disks,
content->array.layout, is_clean, avail) == 0) {
set_array_assembly_status(c, result, INCR_NO, &array);
if (c->verbose >= 0 && is_raid456 && !is_clean)
pr_err("Consider --force to start dirty degraded array\n");
free(avail);
return 1;
}
free(avail);
if (c->runstop <= 0 && all_disks < content->array.working_disks) {
set_array_assembly_status(c, result, INCR_UNSAFE, &array);
if (c->verbose >= 0 && c->force)
pr_err("Consider --run to start array as degraded.\n");
return 1;
}
if (is_raid456 && content->resync_start != MaxSector && c->force &&
all_disks < content->array.raid_disks) {
content->resync_start = MaxSector;
err = sysfs_set_num(content, NULL, "resync_start", MaxSector);
if (err)
return 1;
pr_err("%s array state forced to clean. It may cause data corruption.\n",
chosen_name);
}
/*
* Before activating the array, perform extra steps required
* to configure the internal write-intent bitmap.
*/
if (content->consistency_policy == CONSISTENCY_POLICY_BITMAP &&
st->ss->set_bitmap)
st->ss->set_bitmap(st, content);
if (start_reshape) {
int spare = content->array.raid_disks + array.exp_cnt;
if (restore_backup(st, content,
array.new_cnt,
spare, &c->backup_file, c->verbose) == 1)
return 1;
if (content->reshape_progress == 0) {
/* If reshape progress is 0 - we are assembling the
* array that was stopped, before reshape has started.
* Array needs to be started as active, Grow_continue()
* will start the reshape.
*/
sysfs_set_num(content, NULL, "reshape_position",
MaxSector);
err = sysfs_set_str(content, NULL,
"array_state", "active");
sysfs_set_num(content, NULL, "reshape_position", 0);
} else {
err = sysfs_set_str(content, NULL,
"array_state", "readonly");
}
if (err)
return 1;
if (st->ss->external) {
if (!mdmon_running(st->container_devnm))
start_mdmon(st->container_devnm);
ping_monitor(st->container_devnm);
if (mdmon_running(st->container_devnm) &&
st->update_tail == NULL)
st->update_tail = &st->updates;
}
err = Grow_continue(mdfd, st, content, c->backup_file,
0, c->freeze_reshape);
} else switch(content->array.level) {
case LEVEL_LINEAR:
case LEVEL_MULTIPATH:
case 0:
err = sysfs_set_str(content, NULL, "array_state",
c->readonly ? "readonly" : "active");
break;
default:
err = sysfs_set_str(content, NULL, "array_state",
"readonly");
/* start mdmon if needed. */
if (!err) {
if (!mdmon_running(st->container_devnm))
start_mdmon(st->container_devnm);
ping_monitor(st->container_devnm);
}
break;
}
if (!err)
sysfs_set_safemode(content, content->safe_mode_delay);
/* Block subarray here if it is not reshaped now
* It has be blocked a little later to allow mdmon to switch in
* in to R/W state
*/
if (st->ss->external && content->recovery_blocked &&
!start_reshape)
block_subarray(content);
if (err)
set_array_assembly_status(c, result, INCR_NO, &array);
else {
set_array_assembly_status(c, result, INCR_YES, &array);
wait_for(chosen_name, mdfd);
sysfs_rules_apply(chosen_name, content);
}
return err;
/* FIXME should have an O_EXCL and wait for read-auto */
}
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