1349 lines
36 KiB
C
1349 lines
36 KiB
C
/*
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* Incremental.c - support --incremental. Part of:
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neilb@suse.de>
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* Paper: Neil Brown
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* Novell Inc
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* GPO Box Q1283
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* QVB Post Office, NSW 1230
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* Australia
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*/
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#include "mdadm.h"
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#include <dirent.h>
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#include <ctype.h>
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static int count_active(struct supertype *st, int mdfd, char **availp,
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struct mdinfo *info);
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static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
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int number, __u64 events, int verbose,
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char *array_name);
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static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
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struct supertype *st, int verbose);
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static int Incremental_container(struct supertype *st, char *devname,
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int verbose, int runstop, int autof,
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int trustworthy);
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static struct mddev_ident_s *search_mdstat(struct supertype *st,
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struct mdinfo *info,
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char *devname,
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int verbose, int *rvp);
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int Incremental(char *devname, int verbose, int runstop,
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struct supertype *st, char *homehost, int require_homehost,
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int autof)
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{
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/* Add this device to an array, creating the array if necessary
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* and starting the array if sensible or - if runstop>0 - if possible.
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*
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* This has several steps:
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*
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* 1/ Check if device is permitted by mdadm.conf, reject if not.
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* 2/ Find metadata, reject if none appropriate (check
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* version/name from args)
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* 3/ Check if there is a match in mdadm.conf
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* 3a/ if not, check for homehost match. If no match, assemble as
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* a 'foreign' array.
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* 4/ Determine device number.
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* - If in mdadm.conf with std name, use that
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* - UUID in /var/run/mdadm.map use that
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* - If name is suggestive, use that. unless in use with different uuid.
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* - Choose a free, high number.
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* - Use a partitioned device unless strong suggestion not to.
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* e.g. auto=md
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* Don't choose partitioned for containers.
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* 5/ Find out if array already exists
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* 5a/ if it does not
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* - choose a name, from mdadm.conf or 'name' field in array.
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* - create the array
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* - add the device
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* 5b/ if it does
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* - check one drive in array to make sure metadata is a reasonably
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* close match. Reject if not (e.g. different type)
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* - add the device
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* 6/ Make sure /var/run/mdadm.map contains this array.
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* 7/ Is there enough devices to possibly start the array?
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* For a container, this means running Incremental_container.
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* 7a/ if not, finish with success.
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* 7b/ if yes,
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* - read all metadata and arrange devices like -A does
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* - if number of OK devices match expected, or -R and there are enough,
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* start the array (auto-readonly).
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*/
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struct stat stb;
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struct mdinfo info, dinfo;
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struct mddev_ident_s *match;
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char chosen_name[1024];
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int rv = 1;
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struct map_ent *mp, *map = NULL;
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int dfd = -1, mdfd = -1;
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char *avail;
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int active_disks;
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int trustworthy = FOREIGN;
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char *name_to_use;
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mdu_array_info_t ainf;
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struct dev_policy *policy = NULL;
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struct createinfo *ci = conf_get_create_info();
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/* 1/ Check if device is permitted by mdadm.conf */
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if (!conf_test_dev(devname)) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s not permitted by mdadm.conf.\n",
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devname);
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goto out;
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}
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/* 2/ Find metadata, reject if none appropriate (check
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* version/name from args) */
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dfd = dev_open(devname, O_RDONLY|O_EXCL);
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if (dfd < 0) {
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if (verbose >= 0)
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fprintf(stderr, Name ": cannot open %s: %s.\n",
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devname, strerror(errno));
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goto out;
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}
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if (fstat(dfd, &stb) < 0) {
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if (verbose >= 0)
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fprintf(stderr, Name ": fstat failed for %s: %s.\n",
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devname, strerror(errno));
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goto out;
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}
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if ((stb.st_mode & S_IFMT) != S_IFBLK) {
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if (verbose >= 0)
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fprintf(stderr, Name ": %s is not a block device.\n",
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devname);
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goto out;
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}
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dinfo.disk.major = major(stb.st_rdev);
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dinfo.disk.minor = minor(stb.st_rdev);
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policy = disk_policy(&dinfo);
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if (st == NULL && (st = guess_super(dfd)) == NULL) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": no recognisable superblock on %s.\n",
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devname);
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rv = try_spare(devname, &dfd, policy, st, verbose);
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goto out;
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}
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if (st->ss->compare_super == NULL ||
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st->ss->load_super(st, dfd, NULL)) {
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if (verbose >= 0)
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fprintf(stderr, Name ": no RAID superblock on %s.\n",
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devname);
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rv = try_spare(devname, &dfd, policy, st, verbose);
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free(st);
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goto out;
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}
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close (dfd); dfd = -1;
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memset(&info, 0, sizeof(info));
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st->ss->getinfo_super(st, &info, NULL);
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/* 3/ Check if there is a match in mdadm.conf */
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match = search_mdstat(st, &info, devname, verbose, &rv);
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if (!match && rv == 2)
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goto out;
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if (match && match->devname
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&& strcasecmp(match->devname, "<ignore>") == 0) {
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if (verbose >= 0)
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fprintf(stderr, Name ": array containing %s is explicitly"
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" ignored by mdadm.conf\n",
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devname);
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goto out;
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}
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/* 3a/ if not, check for homehost match. If no match, continue
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* but don't trust the 'name' in the array. Thus a 'random' minor
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* number will be assigned, and the device name will be based
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* on that. */
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if (match)
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trustworthy = LOCAL;
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else if (st->ss->match_home(st, homehost) == 1)
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trustworthy = LOCAL;
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else if (st->ss->match_home(st, "any") == 1)
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trustworthy = LOCAL_ANY;
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else
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trustworthy = FOREIGN;
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if (!match && !conf_test_metadata(st->ss->name, policy,
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(trustworthy == LOCAL))) {
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if (verbose >= 1)
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fprintf(stderr, Name
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": %s has metadata type %s for which "
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"auto-assembly is disabled\n",
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devname, st->ss->name);
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goto out;
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}
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if (trustworthy == LOCAL_ANY)
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trustworthy = LOCAL;
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/* There are three possible sources for 'autof': command line,
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* ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
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* ARRAY takes precedence, then command line, then
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* CREATE.
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*/
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if (match && match->autof)
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autof = match->autof;
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if (autof == 0)
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autof = ci->autof;
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if (st->ss->container_content && st->loaded_container) {
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if ((runstop > 0 && info.container_enough >= 0) ||
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info.container_enough > 0)
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/* pass */;
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else {
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if (verbose)
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fprintf(stderr, Name ": not enough devices to start the container\n");
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rv = 0;
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goto out;
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}
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/* This is a pre-built container array, so we do something
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* rather different.
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*/
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rv = Incremental_container(st, devname, verbose, runstop,
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autof, trustworthy);
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goto out;
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}
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name_to_use = info.name;
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if (name_to_use[0] == 0 &&
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info.array.level == LEVEL_CONTAINER &&
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trustworthy == LOCAL) {
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name_to_use = info.text_version;
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trustworthy = METADATA;
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}
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if (name_to_use[0] && trustworthy != LOCAL &&
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! require_homehost &&
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conf_name_is_free(name_to_use))
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trustworthy = LOCAL;
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/* strip "hostname:" prefix from name if we have decided
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* to treat it as LOCAL
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*/
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if (trustworthy == LOCAL && strchr(name_to_use, ':') != NULL)
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name_to_use = strchr(name_to_use, ':')+1;
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/* 4/ Check if array exists.
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*/
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if (map_lock(&map))
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fprintf(stderr, Name ": failed to get exclusive lock on "
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"mapfile\n");
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mp = map_by_uuid(&map, info.uuid);
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if (mp)
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mdfd = open_dev(mp->devnum);
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else
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mdfd = -1;
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if (mdfd < 0) {
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struct mdinfo *sra;
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/* Couldn't find an existing array, maybe make a new one */
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mdfd = create_mddev(match ? match->devname : NULL,
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name_to_use, autof, trustworthy, chosen_name);
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if (mdfd < 0)
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goto out;
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sysfs_init(&info, mdfd, 0);
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if (set_array_info(mdfd, st, &info) != 0) {
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fprintf(stderr, Name ": failed to set array info for %s: %s\n",
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chosen_name, strerror(errno));
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rv = 2;
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goto out;
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}
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dinfo = info;
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dinfo.disk.major = major(stb.st_rdev);
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dinfo.disk.minor = minor(stb.st_rdev);
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if (add_disk(mdfd, st, &info, &dinfo) != 0) {
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fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
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devname, chosen_name, strerror(errno));
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ioctl(mdfd, STOP_ARRAY, 0);
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rv = 2;
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goto out;
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}
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sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
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if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
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/* It really should be 'none' - must be old buggy
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* kernel, and mdadm -I may not be able to complete.
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* So reject it.
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*/
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ioctl(mdfd, STOP_ARRAY, NULL);
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fprintf(stderr, Name
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": You have an old buggy kernel which cannot support\n"
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" --incremental reliably. Aborting.\n");
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sysfs_free(sra);
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rv = 2;
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goto out;
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}
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info.array.working_disks = 1;
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sysfs_free(sra);
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/* 6/ Make sure /var/run/mdadm.map contains this array. */
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map_update(&map, fd2devnum(mdfd),
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info.text_version,
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info.uuid, chosen_name);
|
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} else {
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/* 5b/ if it does */
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/* - check one drive in array to make sure metadata is a reasonably */
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/* close match. Reject if not (e.g. different type) */
|
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/* - add the device */
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char dn[20];
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int dfd2;
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int err;
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struct mdinfo *sra;
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struct supertype *st2;
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struct mdinfo info2, *d;
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|
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if (mp->path)
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strcpy(chosen_name, mp->path);
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else
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strcpy(chosen_name, devnum2devname(mp->devnum));
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|
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/* It is generally not OK to add non-spare drives to a
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* running array as they are probably missing because
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* they failed. However if runstop is 1, then the
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* array was possibly started early and our best bet is
|
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* to add this anyway.
|
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* Also if action policy is re-add or better we allow
|
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* re-add
|
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*/
|
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if ((info.disk.state & (1<<MD_DISK_SYNC)) != 0
|
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&& ! policy_action_allows(policy, st->ss->name,
|
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act_re_add)
|
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&& runstop < 1) {
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int active = 0;
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|
|
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if (st->ss->external) {
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char *devname = devnum2devname(fd2devnum(mdfd));
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|
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active = devname && is_container_active(devname);
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free(devname);
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} else if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0)
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active = 1;
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if (active) {
|
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fprintf(stderr, Name
|
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": not adding %s to active array (without --run) %s\n",
|
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devname, chosen_name);
|
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rv = 2;
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goto out;
|
|
}
|
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}
|
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sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
|
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if (!sra) {
|
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rv = 2;
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goto out;
|
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}
|
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if (sra->devs) {
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sprintf(dn, "%d:%d", sra->devs->disk.major,
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sra->devs->disk.minor);
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dfd2 = dev_open(dn, O_RDONLY);
|
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st2 = dup_super(st);
|
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if (st2->ss->load_super(st2, dfd2, NULL) ||
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st->ss->compare_super(st, st2) != 0) {
|
|
fprintf(stderr, Name
|
|
": metadata mismatch between %s and "
|
|
"chosen array %s\n",
|
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devname, chosen_name);
|
|
close(dfd2);
|
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rv = 2;
|
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goto out;
|
|
}
|
|
close(dfd2);
|
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memset(&info2, 0, sizeof(info2));
|
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st2->ss->getinfo_super(st2, &info2, NULL);
|
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st2->ss->free_super(st2);
|
|
if (info.array.level != info2.array.level ||
|
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memcmp(info.uuid, info2.uuid, 16) != 0 ||
|
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info.array.raid_disks != info2.array.raid_disks) {
|
|
fprintf(stderr, Name
|
|
": unexpected difference between %s and %s.\n",
|
|
chosen_name, devname);
|
|
rv = 2;
|
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goto out;
|
|
}
|
|
}
|
|
info2.disk.major = major(stb.st_rdev);
|
|
info2.disk.minor = minor(stb.st_rdev);
|
|
/* add disk needs to know about containers */
|
|
if (st->ss->external)
|
|
sra->array.level = LEVEL_CONTAINER;
|
|
err = add_disk(mdfd, st, sra, &info2);
|
|
if (err < 0 && errno == EBUSY) {
|
|
/* could be another device present with the same
|
|
* disk.number. Find and reject any such
|
|
*/
|
|
find_reject(mdfd, st, sra, info.disk.number,
|
|
info.events, verbose, chosen_name);
|
|
err = add_disk(mdfd, st, sra, &info2);
|
|
}
|
|
if (err < 0) {
|
|
fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
|
|
devname, chosen_name, strerror(errno));
|
|
rv = 2;
|
|
goto out;
|
|
}
|
|
info.array.working_disks = 0;
|
|
for (d = sra->devs; d; d=d->next)
|
|
info.array.working_disks ++;
|
|
|
|
}
|
|
|
|
/* 7/ Is there enough devices to possibly start the array? */
|
|
/* 7a/ if not, finish with success. */
|
|
if (info.array.level == LEVEL_CONTAINER) {
|
|
/* Try to assemble within the container */
|
|
map_unlock(&map);
|
|
sysfs_uevent(&info, "change");
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": container %s now has %d devices\n",
|
|
chosen_name, info.array.working_disks);
|
|
wait_for(chosen_name, mdfd);
|
|
close(mdfd);
|
|
rv = Incremental(chosen_name, verbose, runstop,
|
|
NULL, homehost, require_homehost, autof);
|
|
if (rv == 1)
|
|
/* Don't fail the whole -I if a subarray didn't
|
|
* have enough devices to start yet
|
|
*/
|
|
rv = 0;
|
|
return rv;
|
|
}
|
|
avail = NULL;
|
|
active_disks = count_active(st, mdfd, &avail, &info);
|
|
if (enough(info.array.level, info.array.raid_disks,
|
|
info.array.layout, info.array.state & 1,
|
|
avail, active_disks) == 0) {
|
|
free(avail);
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": %s attached to %s, not enough to start (%d).\n",
|
|
devname, chosen_name, active_disks);
|
|
map_unlock(&map);
|
|
rv = 0;
|
|
goto out;
|
|
}
|
|
free(avail);
|
|
|
|
/* 7b/ if yes, */
|
|
/* - if number of OK devices match expected, or -R and there */
|
|
/* are enough, */
|
|
/* + add any bitmap file */
|
|
/* + start the array (auto-readonly). */
|
|
|
|
if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": %s attached to %s which is already active.\n",
|
|
devname, chosen_name);
|
|
map_unlock(&map);
|
|
rv = 0;
|
|
goto out;
|
|
}
|
|
|
|
map_unlock(&map);
|
|
if (runstop > 0 || active_disks >= info.array.working_disks) {
|
|
struct mdinfo *sra, *dsk;
|
|
/* Let's try to start it */
|
|
if (match && match->bitmap_file) {
|
|
int bmfd = open(match->bitmap_file, O_RDWR);
|
|
if (bmfd < 0) {
|
|
fprintf(stderr, Name
|
|
": Could not open bitmap file %s.\n",
|
|
match->bitmap_file);
|
|
goto out;
|
|
}
|
|
if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
|
|
close(bmfd);
|
|
fprintf(stderr, Name
|
|
": Failed to set bitmapfile for %s.\n",
|
|
chosen_name);
|
|
goto out;
|
|
}
|
|
close(bmfd);
|
|
}
|
|
/* GET_* needed so add_disk works below */
|
|
sra = sysfs_read(mdfd, fd2devnum(mdfd),
|
|
GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE);
|
|
if ((sra == NULL || active_disks >= info.array.working_disks)
|
|
&& trustworthy != FOREIGN)
|
|
rv = ioctl(mdfd, RUN_ARRAY, NULL);
|
|
else
|
|
rv = sysfs_set_str(sra, NULL,
|
|
"array_state", "read-auto");
|
|
if (rv == 0) {
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": %s attached to %s, which has been started.\n",
|
|
devname, chosen_name);
|
|
rv = 0;
|
|
wait_for(chosen_name, mdfd);
|
|
/* We just started the array, so some devices
|
|
* might have been evicted from the array
|
|
* because their event counts were too old.
|
|
* If the action=re-add policy is in-force for
|
|
* those devices we should re-add them now.
|
|
*/
|
|
for (dsk = sra->devs; dsk ; dsk = dsk->next) {
|
|
if (disk_action_allows(dsk, st->ss->name, act_re_add) &&
|
|
add_disk(mdfd, st, sra, dsk) == 0)
|
|
fprintf(stderr, Name
|
|
": %s re-added to %s\n",
|
|
dsk->sys_name, chosen_name);
|
|
}
|
|
} else {
|
|
fprintf(stderr, Name
|
|
": %s attached to %s, but failed to start: %s.\n",
|
|
devname, chosen_name, strerror(errno));
|
|
rv = 1;
|
|
}
|
|
} else {
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": %s attached to %s, not enough to start safely.\n",
|
|
devname, chosen_name);
|
|
rv = 0;
|
|
}
|
|
out:
|
|
if (dfd >= 0)
|
|
close(dfd);
|
|
if (mdfd >= 0)
|
|
close(mdfd);
|
|
if (policy)
|
|
dev_policy_free(policy);
|
|
return rv;
|
|
}
|
|
|
|
static struct mddev_ident_s *search_mdstat(struct supertype *st,
|
|
struct mdinfo *info,
|
|
char *devname,
|
|
int verbose, int *rvp)
|
|
{
|
|
struct mddev_ident_s *array_list, *match;
|
|
array_list = conf_get_ident(NULL);
|
|
match = NULL;
|
|
for (; array_list; array_list = array_list->next) {
|
|
if (array_list->uuid_set &&
|
|
same_uuid(array_list->uuid, info->uuid, st->ss->swapuuid)
|
|
== 0) {
|
|
if (verbose >= 2 && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": UUID differs from %s.\n",
|
|
array_list->devname);
|
|
continue;
|
|
}
|
|
if (array_list->name[0] &&
|
|
strcasecmp(array_list->name, info->name) != 0) {
|
|
if (verbose >= 2 && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": Name differs from %s.\n",
|
|
array_list->devname);
|
|
continue;
|
|
}
|
|
if (array_list->devices &&
|
|
!match_oneof(array_list->devices, devname)) {
|
|
if (verbose >= 2 && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": Not a listed device for %s.\n",
|
|
array_list->devname);
|
|
continue;
|
|
}
|
|
if (array_list->super_minor != UnSet &&
|
|
array_list->super_minor != info->array.md_minor) {
|
|
if (verbose >= 2 && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": Different super-minor to %s.\n",
|
|
array_list->devname);
|
|
continue;
|
|
}
|
|
if (!array_list->uuid_set &&
|
|
!array_list->name[0] &&
|
|
!array_list->devices &&
|
|
array_list->super_minor == UnSet) {
|
|
if (verbose >= 2 && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": %s doesn't have any identifying information.\n",
|
|
array_list->devname);
|
|
continue;
|
|
}
|
|
/* FIXME, should I check raid_disks and level too?? */
|
|
|
|
if (match) {
|
|
if (verbose >= 0) {
|
|
if (match->devname && array_list->devname)
|
|
fprintf(stderr, Name
|
|
": we match both %s and %s - cannot decide which to use.\n",
|
|
match->devname, array_list->devname);
|
|
else
|
|
fprintf(stderr, Name
|
|
": multiple lines in mdadm.conf match\n");
|
|
}
|
|
*rvp = 2;
|
|
match = NULL;
|
|
break;
|
|
}
|
|
match = array_list;
|
|
}
|
|
return match;
|
|
}
|
|
|
|
static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
|
|
int number, __u64 events, int verbose,
|
|
char *array_name)
|
|
{
|
|
/* Find a device attached to this array with a disk.number of number
|
|
* and events less than the passed events, and remove the device.
|
|
*/
|
|
struct mdinfo *d;
|
|
mdu_array_info_t ra;
|
|
|
|
if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
|
|
return; /* not safe to remove from active arrays
|
|
* without thinking more */
|
|
|
|
for (d = sra->devs; d ; d = d->next) {
|
|
char dn[10];
|
|
int dfd;
|
|
struct mdinfo info;
|
|
sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
|
|
dfd = dev_open(dn, O_RDONLY);
|
|
if (dfd < 0)
|
|
continue;
|
|
if (st->ss->load_super(st, dfd, NULL)) {
|
|
close(dfd);
|
|
continue;
|
|
}
|
|
st->ss->getinfo_super(st, &info, NULL);
|
|
st->ss->free_super(st);
|
|
close(dfd);
|
|
|
|
if (info.disk.number != number ||
|
|
info.events >= events)
|
|
continue;
|
|
|
|
if (d->disk.raid_disk > -1)
|
|
sysfs_set_str(sra, d, "slot", "none");
|
|
if (sysfs_set_str(sra, d, "state", "remove") == 0)
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": removing old device %s from %s\n",
|
|
d->sys_name+4, array_name);
|
|
}
|
|
}
|
|
|
|
static int count_active(struct supertype *st, int mdfd, char **availp,
|
|
struct mdinfo *bestinfo)
|
|
{
|
|
/* count how many devices in sra think they are active */
|
|
struct mdinfo *d;
|
|
int cnt = 0, cnt1 = 0;
|
|
__u64 max_events = 0;
|
|
struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
|
|
char *avail = NULL;
|
|
|
|
if (!sra)
|
|
return 0;
|
|
|
|
for (d = sra->devs ; d ; d = d->next) {
|
|
char dn[30];
|
|
int dfd;
|
|
int ok;
|
|
struct mdinfo info;
|
|
|
|
sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
|
|
dfd = dev_open(dn, O_RDONLY);
|
|
if (dfd < 0)
|
|
continue;
|
|
ok = st->ss->load_super(st, dfd, NULL);
|
|
close(dfd);
|
|
if (ok != 0)
|
|
continue;
|
|
st->ss->getinfo_super(st, &info, NULL);
|
|
if (!avail) {
|
|
avail = malloc(info.array.raid_disks);
|
|
if (!avail) {
|
|
fprintf(stderr, Name ": out of memory.\n");
|
|
exit(1);
|
|
}
|
|
memset(avail, 0, info.array.raid_disks);
|
|
*availp = avail;
|
|
}
|
|
|
|
if (info.disk.state & (1<<MD_DISK_SYNC))
|
|
{
|
|
if (cnt == 0) {
|
|
cnt++;
|
|
max_events = info.events;
|
|
avail[info.disk.raid_disk] = 2;
|
|
st->ss->getinfo_super(st, bestinfo, NULL);
|
|
} else if (info.events == max_events) {
|
|
cnt++;
|
|
avail[info.disk.raid_disk] = 2;
|
|
} else if (info.events == max_events-1) {
|
|
cnt1++;
|
|
avail[info.disk.raid_disk] = 1;
|
|
} else if (info.events < max_events - 1)
|
|
;
|
|
else if (info.events == max_events+1) {
|
|
int i;
|
|
cnt1 = cnt;
|
|
cnt = 1;
|
|
max_events = info.events;
|
|
for (i=0; i<info.array.raid_disks; i++)
|
|
if (avail[i])
|
|
avail[i]--;
|
|
avail[info.disk.raid_disk] = 2;
|
|
st->ss->getinfo_super(st, bestinfo, NULL);
|
|
} else { /* info.events much bigger */
|
|
cnt = 1; cnt1 = 0;
|
|
memset(avail, 0, info.disk.raid_disk);
|
|
max_events = info.events;
|
|
avail[info.disk.raid_disk] = 2;
|
|
st->ss->getinfo_super(st, bestinfo, NULL);
|
|
}
|
|
}
|
|
st->ss->free_super(st);
|
|
}
|
|
return cnt + cnt1;
|
|
}
|
|
|
|
static int array_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
|
|
struct supertype *st, int verbose)
|
|
{
|
|
/* This device doesn't have any md metadata
|
|
* If it is 'bare' and theh device policy allows 'spare' look for
|
|
* an array or container to attach it to.
|
|
* If st is set, then only arrays of that type are considered
|
|
* Return 0 on success, or some exit code on failure, probably 1.
|
|
*/
|
|
int rv = -1;
|
|
struct stat stb;
|
|
struct map_ent *mp, *map = NULL;
|
|
struct mdinfo *chosen = NULL;
|
|
int dfd = *dfdp;
|
|
|
|
if (fstat(dfd, &stb) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Now we need to find a suitable array to add this to.
|
|
* We only accept arrays that:
|
|
* - match 'st'
|
|
* - are in the same domains as the device
|
|
* - are of an size for which the device will be useful
|
|
* and we choose the one that is the most degraded
|
|
*/
|
|
|
|
if (map_lock(&map)) {
|
|
fprintf(stderr, Name ": failed to get exclusive lock on "
|
|
"mapfile\n");
|
|
return 1;
|
|
}
|
|
for (mp = map ; mp ; mp = mp->next) {
|
|
struct supertype *st2;
|
|
struct domainlist *dl = NULL;
|
|
struct mdinfo *sra;
|
|
unsigned long long devsize;
|
|
|
|
if (is_subarray(mp->metadata))
|
|
continue;
|
|
if (st) {
|
|
st2 = st->ss->match_metadata_desc(mp->metadata);
|
|
if (!st2 ||
|
|
(st->minor_version >= 0 &&
|
|
st->minor_version != st2->minor_version)) {
|
|
if (verbose > 1)
|
|
fprintf(stderr, Name ": not adding %s to %s as metadata type doesn't match\n",
|
|
devname, mp->path);
|
|
free(st2);
|
|
continue;
|
|
}
|
|
free(st2);
|
|
}
|
|
sra = sysfs_read(-1, mp->devnum,
|
|
GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE|
|
|
GET_DEGRADED|GET_COMPONENT|GET_VERSION);
|
|
if (!sra) {
|
|
/* Probably a container - no degraded info */
|
|
sra = sysfs_read(-1, mp->devnum,
|
|
GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE|
|
|
GET_COMPONENT|GET_VERSION);
|
|
if (sra)
|
|
sra->array.failed_disks = 0;
|
|
}
|
|
if (!sra)
|
|
continue;
|
|
if (st == NULL) {
|
|
int i;
|
|
st2 = NULL;
|
|
for(i=0; !st2 && superlist[i]; i++)
|
|
st2 = superlist[i]->match_metadata_desc(
|
|
sra->text_version);
|
|
} else
|
|
st2 = st;
|
|
get_dev_size(dfd, NULL, &devsize);
|
|
if (st2->ss->avail_size(st2, devsize) < sra->component_size) {
|
|
if (verbose > 1)
|
|
fprintf(stderr, Name ": not adding %s to %s as it is too small\n",
|
|
devname, mp->path);
|
|
goto next;
|
|
}
|
|
dl = domain_from_array(sra, st2->ss->name);
|
|
if (!domain_test(dl, pol, st2->ss->name)) {
|
|
/* domain test fails */
|
|
if (verbose > 1)
|
|
fprintf(stderr, Name ": not adding %s to %s as it is not in a compatible domain\n",
|
|
devname, mp->path);
|
|
|
|
goto next;
|
|
}
|
|
/* all tests passed, OK to add to this array */
|
|
if (!chosen) {
|
|
chosen = sra;
|
|
sra = NULL;
|
|
} else if (chosen->array.failed_disks < sra->array.failed_disks) {
|
|
sysfs_free(chosen);
|
|
chosen = sra;
|
|
sra = NULL;
|
|
}
|
|
next:
|
|
if (sra)
|
|
sysfs_free(sra);
|
|
if (st != st2)
|
|
free(st2);
|
|
if (dl)
|
|
domain_free(dl);
|
|
}
|
|
if (chosen) {
|
|
/* add current device to chosen array as a spare */
|
|
int mdfd = open_dev(devname2devnum(chosen->sys_name));
|
|
if (mdfd >= 0) {
|
|
struct mddev_dev_s devlist;
|
|
char devname[20];
|
|
devlist.next = NULL;
|
|
devlist.used = 0;
|
|
devlist.re_add = 0;
|
|
devlist.writemostly = 0;
|
|
devlist.devname = devname;
|
|
sprintf(devname, "%d:%d", major(stb.st_rdev),
|
|
minor(stb.st_rdev));
|
|
devlist.disposition = 'a';
|
|
close(dfd);
|
|
*dfdp = -1;
|
|
rv = Manage_subdevs(chosen->sys_name, mdfd, &devlist,
|
|
-1, 0);
|
|
close(mdfd);
|
|
}
|
|
if (verbose > 0) {
|
|
if (rv == 0)
|
|
fprintf(stderr, Name ": added %s as spare for %s\n",
|
|
devname, chosen->sys_name);
|
|
else
|
|
fprintf(stderr, Name ": failed to add %s as spare for %s\n",
|
|
devname, chosen->sys_name);
|
|
}
|
|
sysfs_free(chosen);
|
|
}
|
|
return rv ? 0 : 1;
|
|
}
|
|
|
|
static int partition_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
|
|
struct supertype *st, int verbose)
|
|
{
|
|
/* we know that at least one partition virtual-metadata is
|
|
* allowed to incorporate spares like this device. We need to
|
|
* find a suitable device to copy partition information from.
|
|
*
|
|
* Getting a list of all disk (not partition) devices is
|
|
* slightly non-trivial. We could look at /sys/block, but
|
|
* that is theoretically due to be removed. Maybe best to use
|
|
* /dev/disk/by-path/?* and ignore names ending '-partNN' as
|
|
* we depend on this directory of 'path' info. But that fails
|
|
* to find loop devices and probably others. Maybe don't
|
|
* worry about that, they aren't the real target.
|
|
*
|
|
* So: check things in /dev/disk/by-path to see if they are in
|
|
* a compatible domain, then load the partition table and see
|
|
* if it is OK for the new device, and choose the largest
|
|
* partition table that fits.
|
|
*/
|
|
DIR *dir;
|
|
struct dirent *de;
|
|
char *chosen = NULL;
|
|
unsigned long long chosen_size;
|
|
struct supertype *chosen_st = NULL;
|
|
int fd;
|
|
|
|
dir = opendir("/dev/disk/by-path");
|
|
if (!dir)
|
|
return 1;
|
|
while ((de = readdir(dir)) != NULL) {
|
|
char *ep;
|
|
struct dev_policy *pol2 = NULL;
|
|
struct domainlist *domlist = NULL;
|
|
int fd = -1;
|
|
struct mdinfo info;
|
|
struct supertype *st2 = NULL;
|
|
char *devname = NULL;
|
|
unsigned long long devsectors;
|
|
|
|
if (de->d_ino == 0 ||
|
|
de->d_name[0] == '.' ||
|
|
(de->d_type != DT_LNK && de->d_type != DT_UNKNOWN))
|
|
goto next;
|
|
|
|
ep = de->d_name + strlen(de->d_name);
|
|
while (ep > de->d_name &&
|
|
isdigit(ep[-1]))
|
|
ep--;
|
|
if (ep > de->d_name + 5 &&
|
|
strncmp(ep-5, "-part", 5) == 0)
|
|
/* This is a partition - skip it */
|
|
goto next;
|
|
|
|
pol2 = path_policy(de->d_name, type_disk);
|
|
|
|
domain_merge(&domlist, pol2, st ? st->ss->name : NULL);
|
|
if (domain_test(domlist, pol, st ? st->ss->name : NULL) == 0)
|
|
/* new device is incompatible with this device. */
|
|
goto next;
|
|
|
|
domain_free(domlist);
|
|
domlist = NULL;
|
|
|
|
asprintf(&devname, "/dev/disk/by-path/%s", de->d_name);
|
|
fd = open(devname, O_RDONLY);
|
|
if (fd < 0)
|
|
goto next;
|
|
if (get_dev_size(fd, devname, &devsectors) == 0)
|
|
goto next;
|
|
devsectors >>= 9;
|
|
|
|
if (st)
|
|
st2 = dup_super(st);
|
|
else
|
|
st2 = guess_super_type(fd, guess_partitions);
|
|
if (st2 == NULL ||
|
|
st2->ss->load_super(st2, fd, NULL) < 0)
|
|
goto next;
|
|
|
|
if (!st) {
|
|
/* Check domain policy again, this time referring to metadata */
|
|
domain_merge(&domlist, pol2, st2->ss->name);
|
|
if (domain_test(domlist, pol, st2->ss->name) == 0)
|
|
/* Incompatible devices for this metadata type */
|
|
goto next;
|
|
}
|
|
|
|
st2->ss->getinfo_super(st2, &info, NULL);
|
|
if (info.component_size > devsectors)
|
|
/* This partitioning doesn't fit in the device */
|
|
goto next;
|
|
|
|
/* This is an acceptable device to copy partition
|
|
* metadata from. We could just stop here, but I
|
|
* think I want to keep looking incase a larger
|
|
* metadata which makes better use of the device can
|
|
* be found.
|
|
*/
|
|
if (chosen == NULL ||
|
|
chosen_size < info.component_size) {
|
|
chosen_size = info.component_size;
|
|
free(chosen);
|
|
chosen = devname;
|
|
devname = NULL;
|
|
if (chosen_st) {
|
|
chosen_st->ss->free_super(chosen_st);
|
|
free(chosen_st);
|
|
}
|
|
chosen_st = st2;
|
|
st2 = NULL;
|
|
}
|
|
|
|
next:
|
|
free(devname);
|
|
domain_free(domlist);
|
|
dev_policy_free(pol2);
|
|
if (st2)
|
|
st2->ss->free_super(st2);
|
|
free(st2);
|
|
|
|
if (fd >= 0)
|
|
close(fd);
|
|
}
|
|
|
|
if (!chosen)
|
|
return 1;
|
|
|
|
/* 'chosen' is the best device we can find. Let's write its
|
|
* metadata to devname dfd is read-only so don't use that
|
|
*/
|
|
fd = open(devname, O_RDWR);
|
|
if (fd >= 0) {
|
|
chosen_st->ss->store_super(chosen_st, fd);
|
|
close(fd);
|
|
}
|
|
free(chosen);
|
|
chosen_st->ss->free_super(chosen_st);
|
|
free(chosen_st);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* adding a spare to a regular array is quite different from adding one to
|
|
* a set-of-partitions virtual array.
|
|
* This function determines which is worth trying and tries as appropriate.
|
|
* Arrays are given priority over partitions.
|
|
*/
|
|
static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
|
|
struct supertype *st, int verbose)
|
|
{
|
|
int i;
|
|
int rv;
|
|
int arrays_ok = 0;
|
|
int partitions_ok = 0;
|
|
char bufpad[4096 + 4096];
|
|
char *buf = (char*)(((long)bufpad + 4096) & ~4095);
|
|
int dfd = *dfdp;
|
|
|
|
/* Can only add a spare if device has at least one domains */
|
|
if (pol_find(pol, pol_domain) == NULL)
|
|
return 1;
|
|
/* And only if some action allows spares */
|
|
if (!policy_action_allows(pol, st?st->ss->name:NULL, act_spare))
|
|
return 1;
|
|
|
|
/* Now check if the device is bare - we don't add non-bare devices
|
|
* yet even if action=-spare
|
|
*/
|
|
|
|
if (lseek(dfd, 0, SEEK_SET) != 0 ||
|
|
read(dfd, buf, 4096) != 4096) {
|
|
not_bare:
|
|
if (verbose > 1)
|
|
fprintf(stderr, Name ": %s is not bare, so not considering as a spare\n",
|
|
devname);
|
|
return 1;
|
|
}
|
|
if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
|
|
goto not_bare;
|
|
if (memcmp(buf, buf+1, 4095) != 0)
|
|
goto not_bare;
|
|
|
|
/* OK, first 4K appear blank, try the end. */
|
|
if (lseek(dfd, -4096, SEEK_END) < 0 ||
|
|
read(dfd, buf, 4096) != 4096)
|
|
goto not_bare;
|
|
|
|
if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
|
|
goto not_bare;
|
|
if (memcmp(buf, buf+1, 4095) != 0)
|
|
goto not_bare;
|
|
|
|
/* This device passes our test for 'is bare'.
|
|
* Let's see what policy allows for such things.
|
|
*/
|
|
if (st) {
|
|
/* just try try 'array' or 'partition' based on this metadata */
|
|
if (st->ss->add_to_super)
|
|
return array_try_spare(devname, dfdp, pol,
|
|
st, verbose);
|
|
else
|
|
return partition_try_spare(devname, dfdp, pol,
|
|
st, verbose);
|
|
}
|
|
/* Now see which metadata type support spare */
|
|
for (i = 0; (!arrays_ok || !partitions_ok) && superlist[i] ; i++) {
|
|
if (superlist[i]->add_to_super && !arrays_ok &&
|
|
policy_action_allows(pol, superlist[i]->name, act_spare))
|
|
arrays_ok = 1;
|
|
if (superlist[i]->add_to_super == NULL && !partitions_ok &&
|
|
policy_action_allows(pol, superlist[i]->name, act_spare))
|
|
partitions_ok = 1;
|
|
}
|
|
rv = 0;
|
|
if (arrays_ok)
|
|
rv = array_try_spare(devname, dfdp, pol, st, verbose);
|
|
if (rv == 0 && partitions_ok)
|
|
rv = partition_try_spare(devname, dfdp, pol, st, verbose);
|
|
return rv;
|
|
}
|
|
|
|
int IncrementalScan(int verbose)
|
|
{
|
|
/* look at every device listed in the 'map' file.
|
|
* If one is found that is not running then:
|
|
* look in mdadm.conf for bitmap file.
|
|
* if one exists, but array has none, add it.
|
|
* try to start array in auto-readonly mode
|
|
*/
|
|
struct map_ent *mapl = NULL;
|
|
struct map_ent *me;
|
|
mddev_ident_t devs, mddev;
|
|
int rv = 0;
|
|
|
|
map_read(&mapl);
|
|
devs = conf_get_ident(NULL);
|
|
|
|
for (me = mapl ; me ; me = me->next) {
|
|
mdu_array_info_t array;
|
|
mdu_bitmap_file_t bmf;
|
|
struct mdinfo *sra;
|
|
int mdfd = open_dev(me->devnum);
|
|
|
|
if (mdfd < 0)
|
|
continue;
|
|
if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
|
|
errno != ENODEV) {
|
|
close(mdfd);
|
|
continue;
|
|
}
|
|
/* Ok, we can try this one. Maybe it needs a bitmap */
|
|
for (mddev = devs ; mddev ; mddev = mddev->next)
|
|
if (mddev->devname && me->path
|
|
&& devname_matches(mddev->devname, me->path))
|
|
break;
|
|
if (mddev && mddev->bitmap_file) {
|
|
/*
|
|
* Note: early kernels will wrongly fail this, so it
|
|
* is a hint only
|
|
*/
|
|
int added = -1;
|
|
if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
|
|
int bmfd = open(mddev->bitmap_file, O_RDWR);
|
|
if (bmfd >= 0) {
|
|
added = ioctl(mdfd, SET_BITMAP_FILE,
|
|
bmfd);
|
|
close(bmfd);
|
|
}
|
|
}
|
|
if (verbose >= 0) {
|
|
if (added == 0)
|
|
fprintf(stderr, Name
|
|
": Added bitmap %s to %s\n",
|
|
mddev->bitmap_file, me->path);
|
|
else if (errno != EEXIST)
|
|
fprintf(stderr, Name
|
|
": Failed to add bitmap to %s: %s\n",
|
|
me->path, strerror(errno));
|
|
}
|
|
}
|
|
sra = sysfs_read(mdfd, 0, 0);
|
|
if (sra) {
|
|
if (sysfs_set_str(sra, NULL,
|
|
"array_state", "read-auto") == 0) {
|
|
if (verbose >= 0)
|
|
fprintf(stderr, Name
|
|
": started array %s\n",
|
|
me->path ?: devnum2devname(me->devnum));
|
|
} else {
|
|
fprintf(stderr, Name
|
|
": failed to start array %s: %s\n",
|
|
me->path ?: devnum2devname(me->devnum),
|
|
strerror(errno));
|
|
rv = 1;
|
|
}
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static char *container2devname(char *devname)
|
|
{
|
|
char *mdname = NULL;
|
|
|
|
if (devname[0] == '/') {
|
|
int fd = open(devname, O_RDONLY);
|
|
if (fd >= 0) {
|
|
mdname = devnum2devname(fd2devnum(fd));
|
|
close(fd);
|
|
}
|
|
} else {
|
|
int uuid[4];
|
|
struct map_ent *mp, *map = NULL;
|
|
|
|
if (!parse_uuid(devname, uuid))
|
|
return mdname;
|
|
mp = map_by_uuid(&map, uuid);
|
|
if (mp)
|
|
mdname = devnum2devname(mp->devnum);
|
|
map_free(map);
|
|
}
|
|
|
|
return mdname;
|
|
}
|
|
|
|
static int Incremental_container(struct supertype *st, char *devname, int verbose,
|
|
int runstop, int autof, int trustworthy)
|
|
{
|
|
/* Collect the contents of this container and for each
|
|
* array, choose a device name and assemble the array.
|
|
*/
|
|
|
|
struct mdinfo *list = st->ss->container_content(st, NULL);
|
|
struct mdinfo *ra;
|
|
struct map_ent *map = NULL;
|
|
|
|
if (map_lock(&map))
|
|
fprintf(stderr, Name ": failed to get exclusive lock on "
|
|
"mapfile\n");
|
|
|
|
for (ra = list ; ra ; ra = ra->next) {
|
|
int mdfd;
|
|
char chosen_name[1024];
|
|
struct map_ent *mp;
|
|
struct mddev_ident_s *match = NULL;
|
|
|
|
mp = map_by_uuid(&map, ra->uuid);
|
|
|
|
if (mp) {
|
|
mdfd = open_dev(mp->devnum);
|
|
if (mp->path)
|
|
strcpy(chosen_name, mp->path);
|
|
else
|
|
strcpy(chosen_name, devnum2devname(mp->devnum));
|
|
} else {
|
|
|
|
/* Check in mdadm.conf for container == devname and
|
|
* member == ra->text_version after second slash.
|
|
*/
|
|
char *sub = strchr(ra->text_version+1, '/');
|
|
struct mddev_ident_s *array_list;
|
|
if (sub) {
|
|
sub++;
|
|
array_list = conf_get_ident(NULL);
|
|
} else
|
|
array_list = NULL;
|
|
for(; array_list ; array_list = array_list->next) {
|
|
char *dn;
|
|
if (array_list->member == NULL ||
|
|
array_list->container == NULL)
|
|
continue;
|
|
if (strcmp(array_list->member, sub) != 0)
|
|
continue;
|
|
if (array_list->uuid_set &&
|
|
!same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
|
|
continue;
|
|
dn = container2devname(array_list->container);
|
|
if (dn == NULL)
|
|
continue;
|
|
if (strncmp(dn, ra->text_version+1,
|
|
strlen(dn)) != 0 ||
|
|
ra->text_version[strlen(dn)+1] != '/') {
|
|
free(dn);
|
|
continue;
|
|
}
|
|
free(dn);
|
|
/* we have a match */
|
|
match = array_list;
|
|
if (verbose>0)
|
|
fprintf(stderr, Name ": match found for member %s\n",
|
|
array_list->member);
|
|
break;
|
|
}
|
|
|
|
if (match && match->devname &&
|
|
strcasecmp(match->devname, "<ignore>") == 0) {
|
|
if (verbose > 0)
|
|
fprintf(stderr, Name ": array %s/%s is "
|
|
"explicitly ignored by mdadm.conf\n",
|
|
match->container, match->member);
|
|
return 2;
|
|
}
|
|
if (match)
|
|
trustworthy = LOCAL;
|
|
|
|
mdfd = create_mddev(match ? match->devname : NULL,
|
|
ra->name,
|
|
autof,
|
|
trustworthy,
|
|
chosen_name);
|
|
}
|
|
|
|
if (mdfd < 0) {
|
|
fprintf(stderr, Name ": failed to open %s: %s.\n",
|
|
chosen_name, strerror(errno));
|
|
return 2;
|
|
}
|
|
|
|
assemble_container_content(st, mdfd, ra, runstop,
|
|
chosen_name, verbose);
|
|
}
|
|
map_unlock(&map);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* IncrementalRemove - Attempt to see if the passed in device belongs to any
|
|
* raid arrays, and if so first fail (if needed) and then remove the device.
|
|
*
|
|
* @devname - The device we want to remove
|
|
*
|
|
* Note: the device name must be a kernel name like "sda", so
|
|
* that we can find it in /proc/mdstat
|
|
*/
|
|
int IncrementalRemove(char *devname, int verbose)
|
|
{
|
|
int mdfd;
|
|
int rv;
|
|
struct mdstat_ent *ent;
|
|
struct mddev_dev_s devlist;
|
|
|
|
if (strchr(devname, '/')) {
|
|
fprintf(stderr, Name ": incremental removal requires a "
|
|
"kernel device name, not a file: %s\n", devname);
|
|
return 1;
|
|
}
|
|
ent = mdstat_by_component(devname);
|
|
if (!ent) {
|
|
fprintf(stderr, Name ": %s does not appear to be a component "
|
|
"of any array\n", devname);
|
|
return 1;
|
|
}
|
|
mdfd = open_dev(ent->devnum);
|
|
if (mdfd < 0) {
|
|
fprintf(stderr, Name ": Cannot open array %s!!\n", ent->dev);
|
|
return 1;
|
|
}
|
|
memset(&devlist, 0, sizeof(devlist));
|
|
devlist.devname = devname;
|
|
devlist.disposition = 'f';
|
|
Manage_subdevs(ent->dev, mdfd, &devlist, verbose, 0);
|
|
devlist.disposition = 'r';
|
|
rv = Manage_subdevs(ent->dev, mdfd, &devlist, verbose, 0);
|
|
close(mdfd);
|
|
return rv;
|
|
}
|