| /* |
| * 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_p.h" |
| #include <ctype.h> |
| |
| void make_parts(char *dev, int cnt) |
| { |
| /* make 'cnt' partition devices for 'dev' |
| * We use the major/minor from dev and add 1..cnt |
| * If dev ends with a digit, we add "p%d" else "%d" |
| * If the name exists, we use it's owner/mode, |
| * else that of dev |
| */ |
| struct stat stb; |
| int major, minor; |
| int i; |
| int nlen = strlen(dev) + 20; |
| char *name = malloc(nlen); |
| int dig = isdigit(dev[strlen(dev)-1]); |
| |
| if (stat(dev, &stb)!= 0) |
| return; |
| if (!S_ISBLK(stb.st_mode)) |
| return; |
| major = major(stb.st_rdev); |
| minor = minor(stb.st_rdev); |
| for (i=1; i <= cnt ; i++) { |
| struct stat stb2; |
| snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i); |
| if (stat(name, &stb2)==0) { |
| if (!S_ISBLK(stb2.st_mode)) |
| continue; |
| if (stb2.st_rdev == makedev(major, minor+i)) |
| continue; |
| unlink(name); |
| } else { |
| stb2 = stb; |
| } |
| mknod(name, S_IFBLK | 0600, makedev(major, minor+i)); |
| chown(name, stb2.st_uid, stb2.st_gid); |
| chmod(name, stb2.st_mode & 07777); |
| stat(name, &stb2); |
| add_dev(name, &stb2, 0, NULL); |
| } |
| } |
| |
| /* |
| * Open a given md device, and check that it really is one. |
| * If 'autof' is given, then we need to create, or recreate, the md device. |
| * If the name already exists, and is not a block device, we fail. |
| * If it exists and is not an md device, is not the right type (partitioned or not), |
| * or is currently in-use, we remove the device, but remember the owner and mode. |
| * If it now doesn't exist, we find a new md array and create the device. |
| * Default ownership is user=0, group=0 perm=0600 |
| */ |
| int open_mddev(char *dev, int autof) |
| { |
| int mdfd; |
| struct stat stb; |
| int major = MD_MAJOR; |
| int minor = 0; |
| int must_remove = 0; |
| struct mdstat_ent *mdlist; |
| int num; |
| |
| if (autof) { |
| /* autof is set, so we need to check that the name is ok, |
| * and possibly create one if not |
| */ |
| if (autof == -2 && !is_standard(dev, NULL)) { |
| fprintf(stderr, Name ": --auto=yes requires a 'standard' md device name, not %s\n", dev); |
| return -1; |
| } |
| stb.st_mode = 0; |
| if (stat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) { |
| fprintf(stderr, Name ": %s is not a block device.\n", |
| dev); |
| return -1; |
| } |
| /* check major number is correct */ |
| if (autof>0) |
| major = get_mdp_major(); |
| if (stb.st_mode && major(stb.st_rdev) != major) |
| must_remove = 1; |
| if (stb.st_mode && !must_remove) { |
| mdu_array_info_t array; |
| /* looks ok, see if it is available */ |
| mdfd = open(dev, O_RDWR, 0); |
| if (mdfd < 0) { |
| fprintf(stderr, Name ": error opening %s: %s\n", |
| dev, strerror(errno)); |
| return -1; |
| } else if (md_get_version(mdfd) <= 0) { |
| fprintf(stderr, Name ": %s does not appear to be an md device\n", |
| dev); |
| close(mdfd); |
| return -1; |
| } |
| if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) { |
| /* already active */ |
| must_remove = 1; |
| close(mdfd); |
| } else { |
| if (autof > 0) |
| make_parts(dev, autof); |
| return mdfd; |
| } |
| } |
| /* Ok, need to find a minor that is not in use. |
| * If the device name is in a 'standard' format, |
| * intuit the minor from that, else |
| * easiest to read /proc/mdstat, and hunt through for |
| * an unused number |
| */ |
| switch(is_standard(dev, &num)) { |
| case -1: /* non partitioned */ |
| if (autof > 0) { |
| fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); |
| return -1; |
| } |
| minor = num; |
| num = -1-num; |
| break; |
| case 1: /* partitioned */ |
| if (autof == -1) { |
| fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); |
| return -1; |
| } |
| minor = num << MdpMinorShift; |
| major = get_mdp_major(); |
| break; |
| case 0: /* not standard, pick an unused number */ |
| mdlist = mdstat_read(0); |
| for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) { |
| struct mdstat_ent *me; |
| for (me=mdlist; me; me=me->next) |
| if (me->devnum == num) |
| break; |
| if (!me) { |
| /* doesn't exist if mdstat. |
| * make sure it is new to /dev too |
| */ |
| char *dn; |
| if (autof > 0) |
| minor = (-1-num) << MdpMinorShift; |
| else |
| minor = num; |
| dn = map_dev(major,minor); |
| if (dn==NULL || is_standard(dn, NULL)) { |
| /* this number only used by a 'standard' name, |
| * so it is safe to use |
| */ |
| break; |
| } |
| } |
| } |
| } |
| /* major and minor have been chosen */ |
| |
| /* If it was a 'standard' name and it is in-use, then |
| * the device could already be correct |
| */ |
| if (stb.st_mode && major(stb.st_rdev) == major && |
| minor(stb.st_rdev) == minor) |
| ; |
| else { |
| if (major(makedev(major,minor)) != major || |
| minor(makedev(major,minor)) != minor) { |
| fprintf(stderr, Name ": Need newer C library to use more than 4 partitionable md devices, sorry\n"); |
| return -1; |
| } |
| if (must_remove) |
| unlink(dev); |
| |
| if (mknod(dev, S_IFBLK|0600, makedev(major, minor))!= 0) { |
| fprintf(stderr, Name ": failed to create %s\n", dev); |
| return -1; |
| } |
| if (must_remove) { |
| chown(dev, stb.st_uid, stb.st_gid); |
| chmod(dev, stb.st_mode & 07777); |
| } |
| stat(dev, &stb); |
| add_dev(dev, &stb, 0, NULL); |
| make_parts(dev,autof); |
| } |
| } |
| mdfd = open(dev, O_RDWR, 0); |
| if (mdfd < 0) |
| fprintf(stderr, Name ": error opening %s: %s\n", |
| dev, strerror(errno)); |
| else if (md_get_version(mdfd) <= 0) { |
| fprintf(stderr, Name ": %s does not appear to be an md device\n", |
| dev); |
| close(mdfd); |
| mdfd = -1; |
| } |
| return mdfd; |
| } |
| |
