Martchus
/
mdadm
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
mdadm/Assemble.c

1648 lines
46 KiB
C
Raw Blame History

/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2009 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>
*/
#include "mdadm.h"
#include <ctype.h>
static int name_matches(char *found, char *required, char *homehost)
{
/* See if the name found matches the required name, possibly
* prefixed with 'homehost'
*/
char fnd[33];
strncpy(fnd, found, 32);
fnd[32] = 0;
if (strcmp(found, required)==0)
return 1;
if (homehost) {
int l = strlen(homehost);
if (l < 32 && fnd[l] == ':' &&
strcmp(fnd+l+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(1, 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,
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)
fprintf(stderr, Name ": %s has wrong uuid.\n",
devname);
return 0;
}
if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
name_matches(content->name, ident->name, homehost)==0) {
if (devname)
fprintf(stderr, Name ": %s has wrong name.\n",
devname);
return 0;
}
if (ident->super_minor != UnSet &&
ident->super_minor != content->array.md_minor) {
if (devname)
fprintf(stderr, Name ": %s has wrong super-minor.\n",
devname);
return 0;
}
if (ident->level != UnSet &&
ident->level != content->array.level) {
if (devname)
fprintf(stderr, Name ": %s has wrong raid level.\n",
devname);
return 0;
}
if (ident->raid_disks != UnSet &&
ident->raid_disks!= content->array.raid_disks) {
if (devname)
fprintf(stderr, Name ": %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)
fprintf(stderr, Name ": %s is not a container and one is required.\n",
devname);
return 0;
} else if (strcmp(ident->member, s+1) != 0) {
if (devname)
fprintf(stderr, Name ": skipping wrong member %s is %s\n",
content->text_version, devname);
return 0;
}
}
return 1;
}
int Assemble(struct supertype *st, char *mddev,
struct mddev_ident *ident,
struct mddev_dev *devlist,
char *backup_file, int invalid_backup,
int readonly, int runstop,
char *update, char *homehost, int require_homehost,
int verbose, int force)
{
/*
* 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 mdfd;
int clean;
int auto_assem = (mddev == NULL && !ident->uuid_set &&
ident->super_minor == UnSet && ident->name[0] == 0
&& (ident->container == NULL || ident->member == NULL));
int old_linux = 0;
int vers = vers; /* Keep gcc quite - it really is initialised */
struct {
char *devname;
int uptodate; /* set once we decide that this device is as
* recent as everything else in the array.
*/
struct mdinfo i;
} *devices;
char *devmap;
int *best = NULL; /* indexed by raid_disk */
int bestcnt = 0;
int devcnt = 0;
unsigned int okcnt, sparecnt, rebuilding_cnt;
unsigned int req_cnt;
int i;
int most_recent = 0;
int chosen_drive;
int change = 0;
int inargv = 0;
int report_missmatch;
int bitmap_done;
int start_partial_ok = (runstop >= 0) &&
(force || devlist==NULL || auto_assem);
unsigned int num_devs;
struct mddev_dev *tmpdev;
struct mdinfo info;
struct mdinfo *content = NULL;
char *avail;
int nextspare = 0;
char *name = NULL;
int trustworthy;
char chosen_name[1024];
struct domainlist *domains = NULL;
if (get_linux_version() < 2004000)
old_linux = 1;
/*
* 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) {
fprintf(stderr, Name ": 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;
report_missmatch = ((inargv && verbose >= 0) || verbose > 0);
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
*/
tmpdev = devlist; num_devs = 0;
while (tmpdev) {
if (tmpdev->used)
tmpdev->used = 2;
else
num_devs++;
tmpdev = tmpdev->next;
}
if (!st && ident->st) st = ident->st;
if (verbose>0)
fprintf(stderr, Name ": looking for devices for %s\n",
mddev ? mddev : "further assembly");
/* 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 stat stb;
struct supertype *tst = dup_super(st);
struct dev_policy *pol = NULL;
int found_container = 0;
if (tmpdev->used > 1) continue;
if (ident->devices &&
!match_oneof(ident->devices, devname)) {
if (report_missmatch)
fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
continue;
}
dfd = dev_open(devname, O_RDONLY|O_EXCL);
if (dfd < 0) {
if (report_missmatch)
fprintf(stderr, Name ": cannot open device %s: %s\n",
devname, strerror(errno));
tmpdev->used = 2;
} else if (fstat(dfd, &stb)< 0) {
/* Impossible! */
fprintf(stderr, Name ": fstat failed for %s: %s\n",
devname, strerror(errno));
tmpdev->used = 2;
} else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
fprintf(stderr, Name ": %s is not a block device.\n",
devname);
tmpdev->used = 2;
} else if (must_be_container(dfd)) {
if (st) {
/* already found some components, this cannot
* be another one.
*/
if (report_missmatch)
fprintf(stderr, Name ": %s is a container, but we are looking for components\n",
devname);
tmpdev->used = 2;
#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
} if (!tst && (tst = super_by_fd(dfd, NULL)) == NULL) {
if (report_missmatch)
fprintf(stderr, Name ": not a recognisable container: %s\n",
devname);
tmpdev->used = 2;
#endif
} else if (!tst->ss->load_container
|| tst->ss->load_container(tst, dfd, NULL)) {
if (report_missmatch)
fprintf(stderr, Name ": no correct container type: %s\n",
devname);
tmpdev->used = 2;
} else if (auto_assem &&
!conf_test_metadata(tst->ss->name, (pol = devnum_policy(stb.st_rdev)),
tst->ss->match_home(tst, homehost) == 1)) {
if (report_missmatch)
fprintf(stderr, Name ": %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_missmatch)
fprintf(stderr, Name ": no recogniseable superblock on %s\n",
devname);
tmpdev->used = 2;
} else if (tst->ss->load_super(tst,dfd, NULL)) {
if (report_missmatch)
fprintf(stderr, Name ": no RAID superblock on %s\n",
devname);
tmpdev->used = 2;
} else if (tst->ss->compare_super == NULL) {
if (report_missmatch)
fprintf(stderr, Name ": 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 = devnum_policy(stb.st_rdev)),
tst->ss->match_home(tst, homehost) == 1)) {
if (report_missmatch)
fprintf(stderr, Name ": %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->uuid_set || ident->name[0] ||
ident->super_minor != UnSet)
/* Ignore unrecognised device if looking for
* specific array */
goto loop;
fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
devname);
if (st)
st->ss->free_super(st);
dev_policy_free(pol);
domain_free(domains);
return 1;
}
if (found_container) {
/* tmpdev is a container. We need to be either
* looking for a member, or auto-assembling
*/
if (ident->container) {
if (ident->container[0] == '/' &&
!same_dev(ident->container, devname)) {
if (report_missmatch)
fprintf(stderr, Name ": %s is not the container required (%s)\n",
devname, ident->container);
goto loop;
}
if (ident->container[0] != '/') {
/* we have a uuid */
int uuid[4];
content = &info;
tst->ss->getinfo_super(tst, content, NULL);
if (!parse_uuid(ident->container, uuid) ||
!same_uuid(content->uuid, uuid, tst->ss->swapuuid)) {
if (report_missmatch)
fprintf(stderr, Name ": %s has wrong UUID to be required container\n",
devname);
goto loop;
}
}
}
/* It is worth looking inside this container.
*/
if (verbose > 0)
fprintf(stderr, Name ": looking in container %s\n",
devname);
for (content = tst->ss->container_content(tst, NULL);
content;
content = content->next) {
/* do not assemble arrays that might have bad blocks */
if (content->array.state & (1<<MD_SB_BBM_ERRORS)) {
fprintf(stderr, Name ": BBM log found in metadata. "
"Cannot activate array(s).\n");
tmpdev->used = 2;
goto loop;
}
if (!ident_matches(ident, content, tst,
homehost, update,
report_missmatch ? devname : NULL))
/* message already printed */;
else if (is_member_busy(content->text_version)) {
if (report_missmatch)
fprintf(stderr, Name ": member %s in %s is already assembled\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) {
fprintf(stderr, Name ": %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 (verbose > 0)
fprintf(stderr, Name ": found match on member %s in %s\n",
content->text_version, devname);
/* make sure we finished the loop */
tmpdev = NULL;
goto loop;
} else {
content = &info;
tst->ss->getinfo_super(tst, content, NULL);
if (!ident_matches(ident, content, tst,
homehost, update,
report_missmatch ? devname : NULL))
goto loop;
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) != 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 (homehost) {
int first = st->ss->match_home(st, homehost);
int last = tst->ss->match_home(tst, homehost);
if (first != last &&
(first == 1 || last == 1)) {
/* We can do something */
if (first) {/* just ignore this one */
if (report_missmatch)
fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
devname);
goto loop;
} else { /* reject all those sofar */
struct mddev_dev *td;
if (report_missmatch)
fprintf(stderr, Name ": %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;
}
}
}
fprintf(stderr, Name ": 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 = devnum_policy(stb.st_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 = &info;
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;
if (dfd > 0)
close(dfd);
}
}
/* Now reject spares that don't match domains of identified members */
for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
struct stat stb;
if (tmpdev->used != 3)
continue;
if (stat(tmpdev->devname, &stb)< 0) {
fprintf(stderr, Name ": fstat failed for %s: %s\n",
tmpdev->devname, strerror(errno));
tmpdev->used = 2;
} else {
struct dev_policy *pol = devnum_policy(stb.st_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);
if (!st || !st->sb || !content)
return 2;
/* Now need to open the array device. Use create_mddev */
if (content == &info)
st->ss->getinfo_super(st, content, NULL);
trustworthy = FOREIGN;
name = content->name;
switch (st->ss->match_home(st, homehost)
?: st->ss->match_home(st, "any")) {
case 1:
trustworthy = LOCAL;
name = strchr(content->name, ':');
if (name)
name++;
else
name = content->name;
break;
}
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 &&
! 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);
if (mdfd < 0) {
st->ss->free_super(st);
if (auto_assem)
goto try_again;
return 1;
}
mddev = chosen_name;
vers = md_get_version(mdfd);
if (vers < 9000) {
fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
" Upgrade your kernel or try --build\n");
close(mdfd);
return 1;
}
if (mddev_busy(fd2devnum(mdfd))) {
fprintf(stderr, Name ": %s already active, cannot restart it!\n",
mddev);
for (tmpdev = devlist ;
tmpdev && tmpdev->used != 1;
tmpdev = tmpdev->next)
;
if (tmpdev && auto_assem)
fprintf(stderr, Name ": %s needed for %s...\n",
mddev, tmpdev->devname);
close(mdfd);
mdfd = -3;
st->ss->free_super(st);
if (auto_assem)
goto try_again;
return 1;
}
ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
#ifndef MDASSEMBLE
if (content != &info) {
/* This is a member of a container. Try starting the array. */
int err;
err = assemble_container_content(st, mdfd, content, runstop,
chosen_name, verbose,
backup_file);
close(mdfd);
return err;
}
#endif
/* Ok, no bad inconsistancy, we can try updating etc */
bitmap_done = 0;
content->update_private = NULL;
devices = malloc(num_devs * sizeof(*devices));
devmap = calloc(num_devs * content->array.raid_disks, 1);
for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
char *devname = tmpdev->devname;
struct stat stb;
/* looks like a good enough match to update the super block if needed */
#ifndef MDASSEMBLE
if (update) {
int dfd;
/* prepare useful information in info structures */
struct stat stb2;
struct supertype *tst;
int err;
fstat(mdfd, &stb2);
if (strcmp(update, "uuid")==0 &&
!ident->uuid_set) {
int rfd;
if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
read(rfd, ident->uuid, 16) != 16) {
*(__u32*)(ident->uuid) = random();
*(__u32*)(ident->uuid+1) = random();
*(__u32*)(ident->uuid+2) = random();
*(__u32*)(ident->uuid+3) = random();
}
if (rfd >= 0) close(rfd);
}
dfd = dev_open(devname, O_RDWR|O_EXCL);
tst = dup_super(st);
if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
fprintf(stderr, Name ": cannot re-read metadata from %s - aborting\n",
devname);
if (dfd >= 0)
close(dfd);
close(mdfd);
free(devices);
free(devmap);
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(update, "byteorder") == 0)
err = 0;
else
err = tst->ss->update_super(tst, content, update,
devname, verbose,
ident->uuid_set,
homehost);
if (err < 0) {
fprintf(stderr,
Name ": --update=%s not understood"
" for %s metadata\n",
update, tst->ss->name);
tst->ss->free_super(tst);
free(tst);
close(mdfd);
close(dfd);
free(devices);
free(devmap);
return 1;
}
if (strcmp(update, "uuid")==0 &&
!ident->uuid_set) {
ident->uuid_set = 1;
memcpy(ident->uuid, content->uuid, 16);
}
if (tst->ss->store_super(tst, dfd))
fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
devname);
close(dfd);
if (strcmp(update, "uuid")==0 &&
ident->bitmap_fd >= 0 && !bitmap_done) {
if (bitmap_update_uuid(ident->bitmap_fd,
content->uuid,
tst->ss->swapuuid) != 0)
fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
else
bitmap_done = 1;
}
tst->ss->free_super(tst);
} else
#endif
{
struct supertype *tst = dup_super(st);
int dfd;
dfd = dev_open(devname, O_RDWR|O_EXCL);
if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
fprintf(stderr, Name ": cannot re-read metadata from %s - aborting\n",
devname);
if (dfd >= 0)
close(dfd);
close(mdfd);
free(devices);
free(devmap);
return 1;
}
tst->ss->getinfo_super(tst, content, devmap + devcnt * content->array.raid_disks);
tst->ss->free_super(tst);
close(dfd);
}
stat(devname, &stb);
if (verbose > 0)
fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
devname, mddev, content->disk.raid_disk);
devices[devcnt].devname = devname;
devices[devcnt].uptodate = 0;
devices[devcnt].i = *content;
devices[devcnt].i.disk.major = major(stb.st_rdev);
devices[devcnt].i.disk.minor = minor(stb.st_rdev);
if (most_recent < devcnt) {
if (devices[devcnt].i.events
> devices[most_recent].i.events)
most_recent = devcnt;
}
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) {
if (nextspare < content->array.raid_disks)
nextspare = content->array.raid_disks;
i = nextspare++;
} else {
if (i >= content->array.raid_disks &&
i >= nextspare)
nextspare = i+1;
}
if (i < 10000) {
if (i >= bestcnt) {
int newbestcnt = i+10;
int *newbest = malloc(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.
*/
fprintf(stderr, Name ": 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);
return 1;
}
if (best[i] == -1
|| (devices[best[i]].i.events
< devices[devcnt].i.events))
best[i] = devcnt;
}
devcnt++;
}
free(content->update_private);
content->update_private = NULL;
if (devcnt == 0) {
fprintf(stderr, Name ": no devices found for %s\n",
mddev);
if (st)
st->ss->free_super(st);
close(mdfd);
free(devices);
free(devmap);
return 1;
}
if (update && strcmp(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 = malloc(content->array.raid_disks);
memset(avail, 0, content->array.raid_disks);
okcnt = 0;
sparecnt=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_ACTIVE))) {
if (!(devices[j].i.disk.state
& (1<<MD_DISK_FAULTY))) {
devices[j].uptodate = 1;
sparecnt++;
}
continue;
}
/* If this devices thinks that 'most_recent' has failed, then
* we must reject this device.
*/
if (j != most_recent &&
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 (verbose > -1)
fprintf(stderr, Name ": ignoring %s as it reports %s as failed\n",
devices[j].devname, devices[most_recent].devname);
best[i] = -1;
continue;
}
if (devices[j].i.events+event_margin >=
devices[most_recent].i.events) {
devices[j].uptodate = 1;
if (i < content->array.raid_disks) {
if (devices[j].i.recovery_start == MaxSector ||
(content->reshape_active &&
j >= content->array.raid_disks - content->delta_disks)) {
okcnt++;
avail[i]=1;
} else
rebuilding_cnt++;
} else
sparecnt++;
}
}
free(devmap);
while (force && !enough(content->array.level, content->array.raid_disks,
content->array.layout, 1,
avail, okcnt)) {
/* 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;
chosen_drive = -1;
for (i = 0; i < content->array.raid_disks && i < bestcnt; i++) {
int j = best[i];
if (j>=0 &&
!devices[j].uptodate &&
devices[j].i.recovery_start == MaxSector &&
(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 (verbose >= 0)
fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %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, O_RDWR|O_EXCL);
if (fd < 0) {
fprintf(stderr, Name ": 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);
fprintf(stderr, Name ": 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, verbose,
0, NULL);
if (tst->ss->store_super(tst, fd)) {
close(fd);
fprintf(stderr, Name ": 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 && i < bestcnt ; i++) {
int j = best[i];
if (j >= 0 &&
!devices[j].uptodate &&
devices[j].i.events == current_events) {
chosen_drive = j;
goto add_another;
}
}
}
/* 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++) {
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, O_RDONLY|O_EXCL))< 0) {
fprintf(stderr, Name ": Cannot open %s: %s\n",
devices[j].devname, strerror(errno));
close(mdfd);
free(devices);
return 1;
}
if (st->ss->load_super(st,fd, NULL)) {
close(fd);
fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
devices[j].devname);
close(mdfd);
free(devices);
return 1;
}
close(fd);
}
if (st->sb == NULL) {
fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
close(mdfd);
free(devices);
return 1;
}
st->ss->getinfo_super(st, content, NULL);
#ifndef MDASSEMBLE
sysfs_init(content, mdfd, 0);
#endif
for (i=0; i<bestcnt; i++) {
int j = best[i];
unsigned int desired_state;
if (i < content->array.raid_disks)
desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
else
desired_state = 0;
if (j<0)
continue;
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,
verbose, 0, NULL)) {
if (force) {
if (verbose >= 0)
fprintf(stderr, Name ": "
"clearing FAULTY flag for device %d in %s for %s\n",
j, mddev, devices[j].devname);
change = 1;
} else {
if (verbose >= -1)
fprintf(stderr, Name ": "
"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))) {
fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
i, mddev);
}
#endif
}
if (force && !clean &&
!enough(content->array.level, content->array.raid_disks,
content->array.layout, clean,
avail, okcnt)) {
change += st->ss->update_super(st, content, "force-array",
devices[chosen_drive].devname, verbose,
0, NULL);
clean = 1;
}
if (change) {
int fd;
fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
if (fd < 0) {
fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
devices[chosen_drive].devname);
close(mdfd);
free(devices);
return 1;
}
if (st->ss->store_super(st, fd)) {
close(fd);
fprintf(stderr, Name ": Could not re-write superblock on %s\n",
devices[chosen_drive].devname);
close(mdfd);
free(devices);
return 1;
}
if (verbose >= 0)
fprintf(stderr, Name ": 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
*/
#ifndef MDASSEMBLE
if (content->reshape_active) {
int err = 0;
int *fdlist = malloc(sizeof(int)* bestcnt);
if (verbose > 0)
fprintf(stderr, Name ":%s has an active reshape - checking "
"if critical section needs to be restored\n",
chosen_name);
for (i=0; i<bestcnt; i++) {
int j = best[i];
if (j >= 0) {
fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
if (fdlist[i] < 0) {
fprintf(stderr, Name ": 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,
backup_file, verbose > 0);
if (err && invalid_backup) {
if (verbose > 0)
fprintf(stderr, Name ": continuing"
" without restoring backup\n");
err = 0;
}
}
while (i>0) {
i--;
if (fdlist[i]>=0) close(fdlist[i]);
}
if (err) {
fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
if (backup_file == NULL)
fprintf(stderr," Possibly you needed to specify the --backup-file\n");
close(mdfd);
free(devices);
return err;
}
}
#endif
/* count 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;
/* Almost ready to actually *do* something */
if (!old_linux) {
int rv;
/* First, fill in the map, so that udev can find our name
* as soon as we become active.
*/
map_update(NULL, fd2devnum(mdfd), content->text_version,
content->uuid, chosen_name);
rv = set_array_info(mdfd, st, content);
if (rv) {
fprintf(stderr, Name ": failed to set array info for %s: %s\n",
mddev, strerror(errno));
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
return 1;
}
if (ident->bitmap_fd >= 0) {
if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
return 1;
}
} else if (ident->bitmap_file) {
/* From config file */
int bmfd = open(ident->bitmap_file, O_RDWR);
if (bmfd < 0) {
fprintf(stderr, Name ": Could not open bitmap file %s\n",
ident->bitmap_file);
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
return 1;
}
if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
close(bmfd);
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
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].uptodate */) {
int 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) {
fprintf(stderr, Name ": failed to add "
"%s to %s: %s\n",
devices[j].devname,
mddev,
strerror(errno));
if (i < content->array.raid_disks
|| i == bestcnt)
okcnt--;
else
sparecnt--;
} else if (verbose > 0)
fprintf(stderr, Name ": added %s "
"to %s as %d\n",
devices[j].devname, mddev,
devices[j].i.disk.raid_disk);
} else if (verbose > 0 && i < content->array.raid_disks)
fprintf(stderr, Name ": no uptodate device for "
"slot %d of %s\n",
i, mddev);
}
if (content->array.level == LEVEL_CONTAINER) {
if (verbose >= 0) {
fprintf(stderr, Name ": Container %s has been "
"assembled with %d drive%s",
mddev, okcnt+sparecnt, okcnt+sparecnt==1?"":"s");
if (okcnt < (unsigned)content->array.raid_disks)
fprintf(stderr, " (out of %d)",
content->array.raid_disks);
fprintf(stderr, "\n");
}
st->ss->free_super(st);
sysfs_uevent(content, "change");
wait_for(chosen_name, mdfd);
close(mdfd);
free(devices);
return 0;
}
if (runstop == 1 ||
(runstop <= 0 &&
( enough(content->array.level, content->array.raid_disks,
content->array.layout, clean, avail, okcnt) &&
(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;
#ifndef MDASSEMBLE
if (content->reshape_active &&
content->delta_disks <= 0)
rv = Grow_continue(mdfd, st, content, backup_file);
else
#endif
rv = ioctl(mdfd, RUN_ARRAY, NULL);
if (rv == 0) {
if (verbose >= 0) {
fprintf(stderr, Name ": %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");
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
*/
if (256 < 4 * (content->array.chunk_size/4096)) {
struct mdinfo *sra = sysfs_read(mdfd, 0, 0);
if (sra)
sysfs_set_num(sra, NULL,
"stripe_cache_size",
(4 * content->array.chunk_size / 4096) + 1);
}
}
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 && verbose >= 0)
fprintf(stderr,
Name ": %s has been re-added.\n",
devices[j].devname);
}
}
}
wait_for(mddev, 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;
}
}
free(devices);
return 0;
}
fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
mddev, strerror(errno));
if (!enough(content->array.level, content->array.raid_disks,
content->array.layout, 1, avail, okcnt))
fprintf(stderr, Name ": Not enough devices to "
"start the array.\n");
else if (!enough(content->array.level,
content->array.raid_disks,
content->array.layout, clean,
avail, okcnt))
fprintf(stderr, Name ": Not enough devices to "
"start the array while not clean "
"- consider --force.\n");
if (auto_assem)
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
return 1;
}
if (runstop == -1) {
fprintf(stderr, Name ": %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");
close(mdfd);
free(devices);
return 0;
}
if (verbose >= -1) {
fprintf(stderr, Name ": %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, okcnt))
fprintf(stderr, " - not enough to start the array.\n");
else if (!enough(content->array.level,
content->array.raid_disks,
content->array.layout, clean,
avail, okcnt))
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 of %d to start", req_cnt, content->array.raid_disks);
fprintf(stderr, " (use --run to insist).\n");
}
}
if (auto_assem)
ioctl(mdfd, STOP_ARRAY, NULL);
close(mdfd);
free(devices);
return 1;
} else {
/* The "chosen_drive" is a good choice, and if necessary, the superblock has
* been updated to point to the current locations of devices.
* so we can just start the array
*/
unsigned long dev;
dev = makedev(devices[chosen_drive].i.disk.major,
devices[chosen_drive].i.disk.minor);
if (ioctl(mdfd, START_ARRAY, dev)) {
fprintf(stderr, Name ": Cannot start array: %s\n",
strerror(errno));
}
}
close(mdfd);
free(devices);
return 0;
}
#ifndef MDASSEMBLE
int assemble_container_content(struct supertype *st, int mdfd,
struct mdinfo *content, int runstop,
char *chosen_name, int verbose,
char *backup_file)
{
struct mdinfo *dev, *sra;
int working = 0, preexist = 0;
int expansion = 0;
struct map_ent *map = NULL;
int old_raid_disks;
sysfs_init(content, mdfd, 0);
sra = sysfs_read(mdfd, 0, GET_VERSION);
if (sra == NULL || strcmp(sra->text_version, content->text_version) != 0)
if (sysfs_set_array(content, md_get_version(mdfd)) != 0)
return 1;
if (content->reshape_active)
block_subarray(content);
if (sra)
sysfs_free(sra);
old_raid_disks = content->array.raid_disks - content->delta_disks;
for (dev = content->devs; dev; dev = dev->next)
if (sysfs_add_disk(content, dev, 1) == 0) {
if (dev->disk.raid_disk >= old_raid_disks &&
content->reshape_active)
expansion++;
else
working++;
} else if (errno == EEXIST)
preexist++;
if (working == 0)
return 1;/* Nothing new, don't try to start */
map_update(&map, fd2devnum(mdfd),
content->text_version,
content->uuid, chosen_name);
if (runstop > 0 ||
(working + preexist + expansion) >=
content->array.working_disks) {
int err;
if (content->reshape_active) {
int spare = content->array.raid_disks + expansion;
int i;
int *fdlist = malloc(sizeof(int) *
(working + expansion
+ content->array.raid_disks));
for (i=0; i<spare; i++)
fdlist[i] = -1;
for (dev = content->devs; dev; dev = dev->next) {
char buf[20];
int fd;
sprintf(buf, "%d:%d",
dev->disk.major,
dev->disk.minor);
fd = dev_open(buf, O_RDWR);
if (dev->disk.raid_disk >= 0)
fdlist[dev->disk.raid_disk] = fd;
else
fdlist[spare++] = fd;
}
if (st->ss->external && st->ss->recover_backup)
err = st->ss->recover_backup(st, content);
else
err = Grow_restart(st, content, fdlist, spare,
backup_file, verbose > 0);
while (spare > 0) {
spare--;
if (fdlist[spare] >= 0)
close(fdlist[spare]);
}
if (err) {
fprintf(stderr, Name ": Failed to restore critical"
" section for reshape - sorry.\n");
if (!backup_file)
fprintf(stderr, Name ": Possibly you need"
" to specify a --backup-file\n");
return 1;
}
err = Grow_continue(mdfd, st, content, backup_file);
} else switch(content->array.level) {
case LEVEL_LINEAR:
case LEVEL_MULTIPATH:
case 0:
err = sysfs_set_str(content, NULL, "array_state",
"active");
break;
default:
err = sysfs_set_str(content, NULL, "array_state",
"readonly");
/* start mdmon if needed. */
if (!err) {
if (!mdmon_running(st->container_dev))
start_mdmon(st->container_dev);
ping_monitor_by_id(st->container_dev);
}
break;
}
if (!err)
sysfs_set_safemode(content, content->safe_mode_delay);
if (verbose >= 0) {
if (err)
fprintf(stderr, Name
": array %s now has %d devices",
chosen_name, working + preexist);
else
fprintf(stderr, Name
": Started %s with %d devices",
chosen_name, working + preexist);
if (preexist)
fprintf(stderr, " (%d new)", working);
if (expansion)
fprintf(stderr, " ( + %d for expansion)",
expansion);
fprintf(stderr, "\n");
}
if (!err)
wait_for(chosen_name, mdfd);
return err;
/* FIXME should have an O_EXCL and wait for read-auto */
} else {
if (verbose >= 0)
fprintf(stderr, Name
": %s assembled with %d devices but "
"not started\n",
chosen_name, working);
return 1;
}
}
#endif
Reference in New Issue View Git Blame Copy Permalink