63152c1b33
Two places have code to find a free md device number. Make this a subroutine.
710 lines
19 KiB
C
710 lines
19 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 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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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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int Incremental(char *devname, int verbose, int runstop,
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struct supertype *st, char *homehost, 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 sensibe 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, reject.
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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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* 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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* 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, info2;
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struct mddev_ident_s *array_list, *match;
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char chosen_name[1024];
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int rv;
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int devnum;
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struct map_ent *mp, *map = NULL;
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int dfd, mdfd;
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char *avail;
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int active_disks;
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struct createinfo *ci = conf_get_create_info();
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if (autof == 0)
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autof = ci->autof;
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/* 1/ Check if devices 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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return 1;
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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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return 1;
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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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close(dfd);
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return 1;
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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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close(dfd);
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return 1;
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}
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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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close(dfd);
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return 1;
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}
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if (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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close(dfd);
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return 1;
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}
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st->ss->getinfo_super(st, &info);
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close (dfd);
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/* 3/ Check if there is a match in mdadm.conf */
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array_list = conf_get_ident(NULL);
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match = NULL;
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for (; array_list; array_list = array_list->next) {
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if (array_list->uuid_set &&
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same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
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== 0) {
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if (verbose >= 2)
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fprintf(stderr, Name
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": UUID differs from %s.\n",
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array_list->devname);
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continue;
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}
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if (array_list->name[0] &&
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strcasecmp(array_list->name, info.name) != 0) {
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if (verbose >= 2)
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fprintf(stderr, Name
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": Name differs from %s.\n",
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array_list->devname);
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continue;
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}
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if (array_list->devices &&
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!match_oneof(array_list->devices, devname)) {
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if (verbose >= 2)
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fprintf(stderr, Name
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": Not a listed device for %s.\n",
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array_list->devname);
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continue;
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}
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if (array_list->super_minor != UnSet &&
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array_list->super_minor != info.array.md_minor) {
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if (verbose >= 2)
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fprintf(stderr, Name
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": Different super-minor to %s.\n",
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array_list->devname);
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continue;
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}
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if (!array_list->uuid_set &&
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!array_list->name[0] &&
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!array_list->devices &&
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array_list->super_minor == UnSet) {
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if (verbose >= 2)
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fprintf(stderr, Name
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": %s doesn't have any identifying information.\n",
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array_list->devname);
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continue;
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}
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/* FIXME, should I check raid_disks and level too?? */
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if (match) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": we match both %s and %s - cannot decide which to use.\n",
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match->devname, array_list->devname);
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return 2;
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}
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match = array_list;
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}
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/* 3a/ if not, check for homehost match. If no match, reject. */
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if (!match) {
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if (homehost == NULL ||
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st->ss->match_home(st, homehost) == 0) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": not found in mdadm.conf and not identified by homehost.\n");
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return 2;
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}
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}
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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 */
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/* 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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if (match && is_standard(match->devname, &devnum))
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/* We have devnum now */;
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else if ((mp = map_by_uuid(&map, info.uuid)) != NULL)
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devnum = mp->devnum;
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else {
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/* Have to guess a bit. */
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int use_partitions = 1;
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char *np, *ep;
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if ((autof&7) == 3 || (autof&7) == 5)
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use_partitions = 0;
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np = strchr(info.name, ':');
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if (np)
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np++;
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else
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np = info.name;
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devnum = strtoul(np, &ep, 10);
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if (ep > np && *ep == 0) {
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/* This is a number. Let check that it is unused. */
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if (mddev_busy(use_partitions ? (-1-devnum) : devnum))
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devnum = -1;
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} else
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devnum = -1;
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if (devnum < 0) {
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/* Haven't found anything yet, choose something free */
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devnum = find_free_devnum(use_partitions);
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if (devnum == NoMdDev) {
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fprintf(stderr, Name
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": No spare md devices!!\n");
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return 2;
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}
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} else
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devnum = use_partitions ? (-1-devnum) : devnum;
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}
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mdfd = open_mddev_devnum(match ? match->devname : NULL,
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devnum,
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info.name,
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chosen_name);
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if (mdfd < 0) {
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fprintf(stderr, Name ": failed to open %s: %s.\n",
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chosen_name, strerror(errno));
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return 2;
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}
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/* 5/ Find out if array already exists */
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if (! mddev_busy(devnum)) {
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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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mdu_array_info_t ainf;
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mdu_disk_info_t disk;
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char md[20];
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struct mdinfo *sra;
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memset(&ainf, 0, sizeof(ainf));
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ainf.major_version = st->ss->major;
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ainf.minor_version = st->minor_version;
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if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
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fprintf(stderr, Name
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": SET_ARRAY_INFO failed for %s: %s\b",
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chosen_name, strerror(errno));
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close(mdfd);
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return 2;
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}
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sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
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sra = sysfs_read(mdfd, devnum, GET_VERSION);
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sysfs_set_str(sra, NULL, "metadata_version", md);
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memset(&disk, 0, sizeof(disk));
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disk.major = major(stb.st_rdev);
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disk.minor = minor(stb.st_rdev);
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sysfs_free(sra);
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if (ioctl(mdfd, ADD_NEW_DISK, &disk) != 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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close(mdfd);
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return 2;
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}
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sra = sysfs_read(mdfd, devnum, 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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close(mdfd);
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sysfs_free(sra);
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return 2;
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}
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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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mdu_disk_info_t disk;
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int err;
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struct mdinfo *sra;
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struct supertype *st2;
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sra = sysfs_read(mdfd, devnum, (GET_VERSION | GET_DEVS |
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GET_STATE));
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if (sra->array.major_version != st->ss->major ||
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sra->array.minor_version != st->minor_version) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
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devname, chosen_name,
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sra->array.major_version,
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sra->array.minor_version,
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st->ss->major, st->minor_version);
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close(mdfd);
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return 1;
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}
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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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fprintf(stderr, Name
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": Strange error loading metadata for %s.\n",
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chosen_name);
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close(mdfd);
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close(dfd2);
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return 2;
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}
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close(dfd2);
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st2->ss->getinfo_super(st2, &info2);
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st2->ss->free_super(st2);
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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) {
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fprintf(stderr, Name
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": unexpected difference between %s and %s.\n",
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chosen_name, devname);
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close(mdfd);
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return 2;
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}
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memset(&disk, 0, sizeof(disk));
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disk.major = major(stb.st_rdev);
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disk.minor = minor(stb.st_rdev);
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err = ioctl(mdfd, ADD_NEW_DISK, &disk);
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if (err < 0 && errno == EBUSY) {
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/* could be another device present with the same
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* disk.number. Find and reject any such
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*/
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find_reject(mdfd, st, sra, info.disk.number,
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info.events, verbose, chosen_name);
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err = ioctl(mdfd, ADD_NEW_DISK, &disk);
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}
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if (err < 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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close(mdfd);
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return 2;
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}
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}
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/* 6/ Make sure /var/run/mdadm.map contains this array. */
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map_update(&map, devnum,
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info.array.major_version,
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info.array.minor_version,
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info.uuid, chosen_name);
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/* 7/ Is there enough devices to possibly start the array? */
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/* 7a/ if not, finish with success. */
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avail = NULL;
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active_disks = count_active(st, mdfd, &avail, &info);
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if (enough(info.array.level, info.array.raid_disks,
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info.array.layout, info.array.state & 1,
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avail, active_disks) == 0) {
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free(avail);
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s attached to %s, not enough to start (%d).\n",
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devname, chosen_name, active_disks);
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close(mdfd);
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return 0;
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}
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free(avail);
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/* 7b/ if yes, */
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/* - if number of OK devices match expected, or -R and there */
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/* are enough, */
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/* + add any bitmap file */
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/* + start the array (auto-readonly). */
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{
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mdu_array_info_t ainf;
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if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s attached to %s which is already active.\n",
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devname, chosen_name);
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close (mdfd);
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return 0;
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}
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}
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if (runstop > 0 || active_disks >= info.array.working_disks) {
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struct mdinfo *sra;
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/* Let's try to start it */
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if (match && match->bitmap_file) {
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int bmfd = open(match->bitmap_file, O_RDWR);
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if (bmfd < 0) {
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fprintf(stderr, Name
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": Could not open bitmap file %s.\n",
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match->bitmap_file);
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close(mdfd);
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return 1;
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}
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if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
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close(bmfd);
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fprintf(stderr, Name
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": Failed to set bitmapfile for %s.\n",
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chosen_name);
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close(mdfd);
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return 1;
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}
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close(bmfd);
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}
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sra = sysfs_read(mdfd, devnum, 0);
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if (sra == NULL || active_disks >= info.array.working_disks)
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rv = ioctl(mdfd, RUN_ARRAY, NULL);
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else
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rv = sysfs_set_str(sra, NULL,
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"array_state", "read-auto");
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if (rv == 0) {
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s attached to %s, which has been started.\n",
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devname, chosen_name);
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rv = 0;
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} else {
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fprintf(stderr, Name
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": %s attached to %s, but failed to start: %s.\n",
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devname, chosen_name, strerror(errno));
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rv = 1;
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}
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} else {
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if (verbose >= 0)
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fprintf(stderr, Name
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": %s attached to %s, not enough to start safely.\n",
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devname, chosen_name);
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rv = 0;
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}
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close(mdfd);
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return rv;
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}
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|
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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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{
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/* Find a device attached to this array with a disk.number of number
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* and events less than the passed events, and remove the device.
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*/
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struct mdinfo *d;
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mdu_array_info_t ra;
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if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
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return; /* not safe to remove from active arrays
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* without thinking more */
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|
|
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);
|
|
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;
|
|
|
|
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);
|
|
if (info.disk.state & (1<<MD_DISK_SYNC))
|
|
{
|
|
if (avail == NULL) {
|
|
avail = malloc(info.array.raid_disks);
|
|
memset(avail, 0, info.array.raid_disks);
|
|
}
|
|
if (cnt == 0) {
|
|
cnt++;
|
|
max_events = info.events;
|
|
avail[info.disk.raid_disk] = 2;
|
|
st->ss->getinfo_super(st, bestinfo);
|
|
} 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);
|
|
} else { /* info.events much bigger */
|
|
cnt = 1; cnt1 = 0;
|
|
memset(avail, 0, info.disk.raid_disk);
|
|
max_events = info.events;
|
|
st->ss->getinfo_super(st, bestinfo);
|
|
}
|
|
}
|
|
st->ss->free_super(st);
|
|
}
|
|
return cnt + cnt1;
|
|
}
|
|
|
|
void RebuildMap(void)
|
|
{
|
|
struct mdstat_ent *mdstat = mdstat_read(0, 0);
|
|
struct mdstat_ent *md;
|
|
struct map_ent *map = NULL;
|
|
int mdp = get_mdp_major();
|
|
|
|
for (md = mdstat ; md ; md = md->next) {
|
|
struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
|
|
struct mdinfo *sd;
|
|
|
|
for (sd = sra->devs ; sd ; sd = sd->next) {
|
|
char dn[30];
|
|
int dfd;
|
|
int ok;
|
|
struct supertype *st;
|
|
char *path;
|
|
struct mdinfo info;
|
|
|
|
sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
|
|
dfd = dev_open(dn, O_RDONLY);
|
|
if (dfd < 0)
|
|
continue;
|
|
st = guess_super(dfd);
|
|
if ( st == NULL)
|
|
ok = -1;
|
|
else
|
|
ok = st->ss->load_super(st, dfd, NULL);
|
|
close(dfd);
|
|
if (ok != 0)
|
|
continue;
|
|
st->ss->getinfo_super(st, &info);
|
|
if (md->devnum > 0)
|
|
path = map_dev(MD_MAJOR, md->devnum, 0);
|
|
else
|
|
path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
|
|
map_add(&map, md->devnum, st->ss->major,
|
|
st->minor_version,
|
|
info.uuid, path ? : "/unknown");
|
|
st->ss->free_super(st);
|
|
break;
|
|
}
|
|
}
|
|
map_write(map);
|
|
map_free(map);
|
|
}
|
|
|
|
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) {
|
|
char path[1024];
|
|
mdu_array_info_t array;
|
|
mdu_bitmap_file_t bmf;
|
|
struct mdinfo *sra;
|
|
int mdfd = open_mddev_devnum(me->path, me->devnum, NULL, path);
|
|
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 (strcmp(mddev->devname, me->path) == 0)
|
|
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);
|
|
} else {
|
|
fprintf(stderr, Name
|
|
": failed to start array %s: %s\n",
|
|
me->path, strerror(errno));
|
|
rv = 1;
|
|
}
|
|
}
|
|
}
|
|
return rv;
|
|
}
|