405 lines
11 KiB
C
405 lines
11 KiB
C
/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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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@cse.unsw.edu.au>
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* Paper: Neil Brown
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* School of Computer Science and Engineering
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* The University of New South Wales
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* Sydney, 2052
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* Australia
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*/
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#include "mdadm.h"
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#include "md_u.h"
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#include "md_p.h"
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int Create(char *mddev, int mdfd,
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int chunk, int level, int layout, unsigned long size, int raiddisks, int sparedisks,
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int subdevs, mddev_dev_t devlist,
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int runstop, int verbose, int force)
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{
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/*
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* Create a new raid array.
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*
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* First check that necessary details are available
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* (i.e. level, raid-disks)
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*
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* Then check each disk to see what might be on it
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* and report anything interesting.
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*
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* If anything looks odd, and runstop not set,
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* abort.
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*
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* SET_ARRAY_INFO and ADD_NEW_DISK, and
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* if runstop==run, or raiddisks diskswere used,
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* RUN_ARRAY
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*/
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unsigned long long minsize=0, maxsize=0;
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char *mindisc = NULL;
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char *maxdisc = NULL;
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int dnum;
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mddev_dev_t dv;
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int fail=0, warn=0;
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struct stat stb;
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int first_missing = MD_SB_DISKS*2;
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int missing_disks = 0;
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int insert_point = MD_SB_DISKS*2; /* where to insert a missing drive */
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mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
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mdu_array_info_t array;
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if (md_get_version(mdfd) < 9000) {
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fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
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return 1;
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}
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if (level == UnSet) {
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fprintf(stderr,
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Name ": a RAID level is needed to create an array.\n");
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return 1;
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}
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if (raiddisks < 1) {
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fprintf(stderr,
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Name ": a number of --raid-devices must be given to create an array\n");
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return 1;
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}
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if (raiddisks < 4 && level == 6) {
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fprintf(stderr,
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Name ": at least 4 raid-devices needed for level 6\n");
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return 1;
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}
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if (raiddisks > 256 && level == 6) {
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fprintf(stderr,
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Name ": no more than 256 raid-devices supported for level 6\n");
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return 1;
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}
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if (raiddisks < 2 && level >= 4) {
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fprintf(stderr,
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Name ": at least 2 raid-devices needed for level 4 or 5\n");
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return 1;
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}
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if (raiddisks+sparedisks > MD_SB_DISKS) {
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fprintf(stderr,
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Name ": too many devices requested: %d+%d > %d\n",
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raiddisks, sparedisks, MD_SB_DISKS);
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return 1;
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}
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if (subdevs > raiddisks+sparedisks) {
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fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
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return 1;
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}
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if (subdevs < raiddisks+sparedisks) {
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fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
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return 1;
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}
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/* now set some defaults */
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if (layout == UnSet)
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switch(level) {
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default: /* no layout */
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layout = 0;
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break;
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case 10:
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layout = 0x102; /* near=2, far=1 */
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if (verbose)
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fprintf(stderr,
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Name ": layout defaults to n1\n");
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break;
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case 5:
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case 6:
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layout = map_name(r5layout, "default");
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if (verbose)
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fprintf(stderr,
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Name ": layout defaults to %s\n", map_num(r5layout, layout));
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break;
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case LEVEL_FAULTY:
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layout = map_name(faultylayout, "default");
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if (verbose)
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fprintf(stderr,
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Name ": layout defaults to %s\n", map_num(faultylayout, layout));
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break;
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}
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if (level == 10)
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/* check layout fits in array*/
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if ((layout&255) * ((layout>>8)&255) > raiddisks) {
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fprintf(stderr, Name ": that layout requires at least %d devices\n",
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(layout&255) * ((layout>>8)&255));
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return 1;
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}
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switch(level) {
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case 4:
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case 5:
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case 10:
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case 6:
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case 0:
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case -1: /* linear */
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if (chunk == 0) {
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chunk = 64;
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if (verbose)
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fprintf(stderr, Name ": chunk size defaults to 64K\n");
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}
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break;
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default: /* raid1, multipath */
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if (chunk) {
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chunk = 0;
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if (verbose)
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fprintf(stderr, Name ": chunk size ignored for this level\n");
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}
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break;
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}
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/* now look at the subdevs */
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array.active_disks = 0;
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array.working_disks = 0;
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dnum = 0;
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for (dv=devlist; dv; dv=dv->next, dnum++) {
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char *dname = dv->devname;
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unsigned long dsize;
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unsigned long long ldsize, freesize;
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int fd;
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if (strcasecmp(dname, "missing")==0) {
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if (first_missing > dnum)
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first_missing = dnum;
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missing_disks ++;
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continue;
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}
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array.working_disks++;
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if (dnum < raiddisks)
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array.active_disks++;
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fd = open(dname, O_RDONLY, 0);
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if (fd <0 ) {
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fprintf(stderr, Name ": Cannot open %s: %s\n",
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dname, strerror(errno));
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fail=1;
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continue;
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}
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#ifdef BLKGETSIZE64
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if (ioctl(fd, BLKGETSIZE64, &ldsize)==0)
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;
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else
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#endif
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if (ioctl(fd, BLKGETSIZE, &dsize)) {
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fprintf(stderr, Name ": Cannot get size of %s: %s\n",
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dname, strerror(errno));
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fail = 1;
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close(fd);
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continue;
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}
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else {
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ldsize = dsize;
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dsize <<= 9;
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}
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if (ldsize < MD_RESERVED_SECTORS*2LL*512LL) {
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fprintf(stderr, Name ": %s is too small: %luK\n",
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dname, (unsigned long)(ldsize>>10));
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fail = 1;
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close(fd);
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continue;
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}
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freesize = MD_NEW_SIZE_SECTORS((ldsize>>9));
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freesize /= 2;
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if (size && freesize < size) {
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fprintf(stderr, Name ": %s is smaller that given size."
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" %lluK < %luK + superblock\n", dname, freesize, size);
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fail = 1;
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close(fd);
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continue;
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}
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if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
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maxdisc = dname;
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maxsize = freesize;
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}
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if (mindisc ==NULL || (mindisc && freesize < minsize)) {
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mindisc = dname;
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minsize = freesize;
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}
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warn |= check_ext2(fd, dname);
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warn |= check_reiser(fd, dname);
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warn |= check_raid(fd, dname);
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close(fd);
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}
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if (fail) {
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fprintf(stderr, Name ": create aborted\n");
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return 1;
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}
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if (size == 0) {
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if (mindisc == NULL) {
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fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
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return 1;
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}
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if (level > 0) {
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/* size is meaningful */
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if (minsize > 0x100000000ULL) {
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fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
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return 1;
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}
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size = minsize;
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if (verbose)
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fprintf(stderr, Name ": size set to %luK\n", size);
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}
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}
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if (level > 0 && ((maxsize-size)*100 > maxsize)) {
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fprintf(stderr, Name ": largest drive (%s) exceed size (%luK) by more than 1%%\n",
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maxdisc, size);
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warn = 1;
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}
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if (warn) {
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if (runstop!= 1) {
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if (!ask("Continue creating array? ")) {
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fprintf(stderr, Name ": create aborted.\n");
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return 1;
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}
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} else {
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if (verbose)
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fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
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}
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}
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/* If this is raid5, we want to configure the last active slot
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* as missing, so that a reconstruct happens (faster than re-parity)
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* FIX: Can we do this for raid6 as well?
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*/
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if (force == 0 && first_missing >= raiddisks) {
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switch ( level ) {
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case 5:
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insert_point = raiddisks-1;
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sparedisks++;
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array.active_disks--;
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missing_disks++;
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break;
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default:
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break;
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}
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}
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/* Ok, lets try some ioctls */
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array.level = level;
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array.size = size;
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array.raid_disks = raiddisks;
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/* The kernel should *know* what md_minor we are dealing
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* with, but it chooses to trust me instead. Sigh
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*/
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array.md_minor = 0;
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if (fstat(mdfd, &stb)==0)
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array.md_minor = MINOR(stb.st_rdev);
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array.not_persistent = 0;
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/*** FIX: Need to do something about RAID-6 here ***/
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if ( ( (level == 5) &&
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(insert_point < raiddisks || first_missing < raiddisks) )
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||
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( level == 6 && missing_disks == 2)
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)
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array.state = 1; /* clean, but one+ drive will be missing */
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else
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array.state = 0; /* not clean, but no errors */
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/* There is lots of redundancy in these disk counts,
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* raid_disks is the most meaningful value
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* it describes the geometry of the array
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* it is constant
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* nr_disks is total number of used slots.
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* it should be raid_disks+spare_disks
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* spare_disks is the number of extra disks present
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* see above
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* active_disks is the number of working disks in
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* active slots. (With raid_disks)
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* working_disks is the total number of working disks,
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* including spares
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* failed_disks is the number of disks marked failed
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*
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* Ideally, the kernel would keep these (except raid_disks)
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* up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
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* So for now, we assume that all raid and spare
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* devices will be given.
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*/
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array.spare_disks=sparedisks;
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array.failed_disks=missing_disks;
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array.nr_disks = array.working_disks + array.failed_disks;
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array.layout = layout;
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array.chunk_size = chunk*1024;
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if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
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fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
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mddev, strerror(errno));
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return 1;
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}
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for (dnum=0, dv = devlist ; dv ; dv=(dv->next)?(dv->next):moved_disk, dnum++) {
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int fd;
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struct stat stb;
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mdu_disk_info_t disk;
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disk.number = dnum;
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if (dnum == insert_point) {
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moved_disk = dv;
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}
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disk.raid_disk = disk.number;
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if (disk.raid_disk < raiddisks)
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disk.state = 6; /* active and in sync */
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else
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disk.state = 0;
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if (dnum == insert_point ||
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strcasecmp(dv->devname, "missing")==0) {
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disk.major = 0;
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disk.minor = 0;
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disk.state = 1; /* faulty */
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} else {
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fd = open(dv->devname, O_RDONLY, 0);
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if (fd < 0) {
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fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
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dv->devname);
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return 1;
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}
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fstat(fd, &stb);
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disk.major = MAJOR(stb.st_rdev);
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disk.minor = MINOR(stb.st_rdev);
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close(fd);
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}
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if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
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fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
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dv->devname, strerror(errno));
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return 1;
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}
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if (dv == moved_disk && dnum != insert_point) break;
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}
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/* param is not actually used */
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if (runstop == 1 || subdevs >= raiddisks) {
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mdu_param_t param;
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if (ioctl(mdfd, RUN_ARRAY, ¶m)) {
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fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
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strerror(errno));
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Manage_runstop(mddev, mdfd, -1);
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return 1;
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}
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fprintf(stderr, Name ": array %s started.\n", mddev);
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} else {
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fprintf(stderr, Name ": not starting array - not enough devices.\n");
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}
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return 0;
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}
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