332 lines
8.9 KiB
C
332 lines
8.9 KiB
C
/*
|
|
* mdadm - manage Linux "md" devices aka RAID arrays.
|
|
*
|
|
* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Author: Neil Brown
|
|
* Email: <neilb@cse.unsw.edu.au>
|
|
* Paper: Neil Brown
|
|
* School of Computer Science and Engineering
|
|
* The University of New South Wales
|
|
* Sydney, 2052
|
|
* Australia
|
|
*/
|
|
|
|
#include "mdadm.h"
|
|
#include "md_u.h"
|
|
#include "md_p.h"
|
|
|
|
int Create(char *mddev, int mdfd,
|
|
int chunk, int level, int layout, int size, int raiddisks, int sparedisks,
|
|
int subdevs, mddev_dev_t devlist,
|
|
int runstop, int verbose, int force)
|
|
{
|
|
/*
|
|
* Create a new raid array.
|
|
*
|
|
* First check that necessary details are available
|
|
* (i.e. level, raid-disks)
|
|
*
|
|
* Then check each disk to see what might be on it
|
|
* and report anything interesting.
|
|
*
|
|
* If anything looks odd, and runstop not set,
|
|
* abort.
|
|
*
|
|
* SET_ARRAY_INFO and ADD_NEW_DISK, and
|
|
* if runstop==run, or raiddisks diskswere used,
|
|
* RUN_ARRAY
|
|
*/
|
|
int minsize=0, maxsize=0;
|
|
char *mindisc = NULL;
|
|
char *maxdisc = NULL;
|
|
int dnum;
|
|
mddev_dev_t dv;
|
|
int fail=0, warn=0;
|
|
struct stat stb;
|
|
int first_missing = MD_SB_DISKS*2;
|
|
int missing_disks = 0;
|
|
int insert_point = MD_SB_DISKS*2; /* where to insert a missing drive */
|
|
|
|
mdu_array_info_t array;
|
|
|
|
|
|
if (md_get_version(mdfd) < 9000) {
|
|
fprintf(stderr, Name ": Create requires md driver verison 0.90.0 or later\n");
|
|
return 1;
|
|
}
|
|
if (level == -10) {
|
|
fprintf(stderr,
|
|
Name ": a RAID level is needed to create an array.\n");
|
|
return 1;
|
|
}
|
|
if (raiddisks < 1) {
|
|
fprintf(stderr,
|
|
Name ": a number of --raid-disks must be given to create an array\n");
|
|
return 1;
|
|
}
|
|
if (raiddisks < 2 && level >= 4) {
|
|
fprintf(stderr,
|
|
Name ": atleast 2 raid-disks needed for level 4 or 5\n");
|
|
return 1;
|
|
}
|
|
if (raiddisks+sparedisks > MD_SB_DISKS) {
|
|
fprintf(stderr,
|
|
Name ": too many discs requested: %d+%d > %d\n",
|
|
raiddisks, sparedisks, MD_SB_DISKS);
|
|
return 1;
|
|
}
|
|
if (subdevs > raiddisks+sparedisks) {
|
|
fprintf(stderr, Name ": You have listed more disks (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
|
|
return 1;
|
|
}
|
|
if (subdevs < raiddisks+sparedisks) {
|
|
fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
|
|
return 1;
|
|
}
|
|
|
|
/* now set some defaults */
|
|
if (layout == -1)
|
|
switch(level) {
|
|
default: /* no layout */
|
|
layout = 0;
|
|
break;
|
|
case 5:
|
|
layout = map_name(r5layout, "default");
|
|
if (verbose)
|
|
fprintf(stderr,
|
|
Name ": layout defaults to %s\n", map_num(r5layout, layout));
|
|
break;
|
|
}
|
|
|
|
if (chunk == 0) {
|
|
chunk = 64;
|
|
if (verbose)
|
|
fprintf(stderr, Name ": chunk size defaults to 64K\n");
|
|
}
|
|
|
|
/* now look at the subdevs */
|
|
array.active_disks = 0;
|
|
array.working_disks = 0;
|
|
dnum = 0;
|
|
for (dv=devlist; dv; dv=dv->next, dnum++) {
|
|
char *dname = dv->devname;
|
|
int dsize, freesize;
|
|
int fd;
|
|
if (strcasecmp(dname, "missing")==0) {
|
|
if (first_missing > dnum)
|
|
first_missing = dnum;
|
|
missing_disks ++;
|
|
continue;
|
|
}
|
|
array.working_disks++;
|
|
if (dnum < raiddisks)
|
|
array.active_disks++;
|
|
fd = open(dname, O_RDONLY, 0);
|
|
if (fd <0 ) {
|
|
fprintf(stderr, Name ": Cannot open %s: %s\n",
|
|
dname, strerror(errno));
|
|
fail=1;
|
|
continue;
|
|
}
|
|
if (ioctl(fd, BLKGETSIZE, &dsize)) {
|
|
fprintf(stderr, Name ": Cannot get size of %s: %s\n",
|
|
dname, strerror(errno));
|
|
fail = 1;
|
|
close(fd);
|
|
continue;
|
|
}
|
|
if (dsize < MD_RESERVED_SECTORS*2) {
|
|
fprintf(stderr, Name ": %s is too small: %dK\n",
|
|
dname, dsize/2);
|
|
fail = 1;
|
|
close(fd);
|
|
continue;
|
|
}
|
|
freesize = MD_NEW_SIZE_SECTORS(dsize);
|
|
freesize /= 2;
|
|
|
|
if (size && freesize < size) {
|
|
fprintf(stderr, Name ": %s is smaller that given size."
|
|
" %dK < %dK + superblock\n", dname, freesize, size);
|
|
fail = 1;
|
|
close(fd);
|
|
continue;
|
|
}
|
|
if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
|
|
maxdisc = dname;
|
|
maxsize = freesize;
|
|
}
|
|
if (mindisc ==NULL || (mindisc && freesize < minsize)) {
|
|
mindisc = dname;
|
|
minsize = freesize;
|
|
}
|
|
warn |= check_ext2(fd, dname);
|
|
warn |= check_reiser(fd, dname);
|
|
warn |= check_raid(fd, dname);
|
|
close(fd);
|
|
}
|
|
if (fail) {
|
|
fprintf(stderr, Name ": create aborted\n");
|
|
return 1;
|
|
}
|
|
if (size == 0) {
|
|
if (mindisc == NULL) {
|
|
fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
|
|
return 1;
|
|
}
|
|
size = minsize;
|
|
if (verbose && level>0)
|
|
fprintf(stderr, Name ": size set to %dK\n", size);
|
|
}
|
|
if (level >= 1 && ((maxsize-size)*100 > maxsize)) {
|
|
fprintf(stderr, Name ": largest drive (%s) exceed size (%dK) by more than 1%%\n",
|
|
maxdisc, size);
|
|
warn = 1;
|
|
}
|
|
|
|
if (warn) {
|
|
if (runstop!= 1) {
|
|
if (!ask("Continue creating array? ")) {
|
|
fprintf(stderr, Name ": create aborted.\n");
|
|
return 1;
|
|
}
|
|
} else {
|
|
if (verbose)
|
|
fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
|
|
}
|
|
}
|
|
|
|
/* If this is raid5, we want to configure the last active slot
|
|
* as missing, so that a reconstruct happens (faster than re-parity)
|
|
*/
|
|
if (force == 0 && level == 5 && first_missing >= raiddisks) {
|
|
insert_point = raiddisks-1;
|
|
sparedisks++;
|
|
array.active_disks--;
|
|
missing_disks++;
|
|
}
|
|
|
|
/* Ok, lets try some ioctls */
|
|
|
|
array.level = level;
|
|
array.size = size;
|
|
array.raid_disks = raiddisks;
|
|
/* The kernel should *know* what md_minor we are dealing
|
|
* with, but it chooses to trust me instead. Sigh
|
|
*/
|
|
array.md_minor = 0;
|
|
if (fstat(mdfd, &stb)==0)
|
|
array.md_minor = MINOR(stb.st_rdev);
|
|
array.not_persistent = 0;
|
|
if (level == 5 && (insert_point < raiddisks || first_missing < raiddisks))
|
|
array.state = 1; /* clean, but one drive will be missing */
|
|
else
|
|
array.state = 0; /* not clean, but no errors */
|
|
|
|
/* There is lots of redundancy in these disk counts,
|
|
* raid_disks is the most meaningful value
|
|
* it describes the geometry of the array
|
|
* it is constant
|
|
* nr_disks is total number of used slots.
|
|
* it should be raid_disks+spare_disks
|
|
* spare_disks is the number of extra disks present
|
|
* see above
|
|
* active_disks is the number of working disks in
|
|
* active slots. (With raid_disks)
|
|
* working_disks is the total number of working disks,
|
|
* including spares
|
|
* failed_disks is the number of disks marked failed
|
|
*
|
|
* Ideally, the kernel would keep these (except raid_disks)
|
|
* up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
|
|
* So for now, we assume that all raid and spare
|
|
* devices will be given.
|
|
*/
|
|
array.spare_disks=sparedisks;
|
|
array.failed_disks=missing_disks;
|
|
array.nr_disks = array.working_disks + array.failed_disks;
|
|
array.layout = layout;
|
|
array.chunk_size = chunk*1024;
|
|
|
|
if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
|
|
fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
|
|
mddev, strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
for (dnum=0, dv = devlist ; dv ; dv=dv->next, dnum++) {
|
|
int fd;
|
|
struct stat stb;
|
|
mdu_disk_info_t disk;
|
|
|
|
disk.number = dnum;
|
|
if (dnum >= insert_point)
|
|
disk.number++;
|
|
disk.raid_disk = disk.number;
|
|
if (disk.raid_disk < raiddisks)
|
|
disk.state = 6; /* active and in sync */
|
|
else
|
|
disk.state = 0;
|
|
if (strcasecmp(dv->devname, "missing")==0) {
|
|
disk.major = 0;
|
|
disk.minor = 0;
|
|
disk.state = 1; /* faulty */
|
|
} else {
|
|
fd = open(dv->devname, O_RDONLY, 0);
|
|
if (fd < 0) {
|
|
fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
|
|
dv->devname);
|
|
return 1;
|
|
}
|
|
fstat(fd, &stb);
|
|
disk.major = MAJOR(stb.st_rdev);
|
|
disk.minor = MINOR(stb.st_rdev);
|
|
close(fd);
|
|
}
|
|
if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
|
|
fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
|
|
dv->devname, strerror(errno));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (insert_point < MD_SB_DISKS) {
|
|
mdu_disk_info_t disk;
|
|
disk.number = insert_point;
|
|
disk.raid_disk = disk.number;
|
|
disk.state = 1; /* faulty */
|
|
disk.major = disk.minor = 0;
|
|
ioctl(mdfd,ADD_NEW_DISK, &disk);
|
|
}
|
|
|
|
/* param is not actually used */
|
|
if (runstop == 1 || subdevs >= raiddisks) {
|
|
mdu_param_t param;
|
|
if (ioctl(mdfd, RUN_ARRAY, ¶m)) {
|
|
fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
fprintf(stderr, Name ": array %s started.\n", mddev);
|
|
} else {
|
|
fprintf(stderr, Name ": not starting array - not enough discs.\n");
|
|
}
|
|
return 0;
|
|
}
|