When choosing the minor number to use with an array, we currently base the number of the 'name' stored in the metadata if that name is numeric. Extend that so that if it looks like a number md device name (/dev/md0 or just md0 or even /dev/md/0), then we use the number at the end to suggest a minor number. The means that if someone creates and array with "--name md0" or even "--name /dev/md0" it will continue to do what they expect. Signed-off-by: NeilBrown <neilb@suse.de>
408 lines
11 KiB
C
408 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) 2001-2006 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@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_p.h"
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#include <ctype.h>
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void make_parts(char *dev, int cnt)
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{
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/* make 'cnt' partition devices for 'dev'
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* If dev is a device name we use the
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* major/minor from dev and add 1..cnt
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* If it is a symlink, we make similar symlinks.
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* If dev ends with a digit, we add "p%d" else "%d"
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* If the name exists, we use it's owner/mode,
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* else that of dev
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*/
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struct stat stb;
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int major_num = major_num; /* quiet gcc -Os unitialized warning */
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int minor_num = minor_num; /* quiet gcc -Os unitialized warning */
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int odig = odig; /* quiet gcc -Os unitialized warning */
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int i;
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int nlen = strlen(dev) + 20;
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char *name = malloc(nlen);
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int dig = isdigit(dev[strlen(dev)-1]);
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char orig[1024];
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char sym[1024];
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int err;
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if (cnt==0) cnt=4;
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if (lstat(dev, &stb)!= 0)
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return;
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if (S_ISLNK(stb.st_mode)) {
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int len = readlink(dev, orig, sizeof(orig));
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if (len < 0 || len > 1000)
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return;
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orig[len] = 0;
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odig = isdigit(orig[len-1]);
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} else if (S_ISBLK(stb.st_mode)) {
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major_num = major(stb.st_rdev);
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minor_num = minor(stb.st_rdev);
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} else
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return;
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for (i=1; i <= cnt ; i++) {
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struct stat stb2;
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snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i);
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if (stat(name, &stb2)==0) {
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if (!S_ISBLK(stb2.st_mode))
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continue;
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if (stb2.st_rdev == makedev(major_num, minor_num+i))
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continue;
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unlink(name);
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} else {
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stb2 = stb;
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}
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if (S_ISBLK(stb.st_mode)) {
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if (mknod(name, S_IFBLK | 0600,
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makedev(major_num, minor_num+i)))
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perror("mknod");
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if (chown(name, stb2.st_uid, stb2.st_gid))
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perror("chown");
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if (chmod(name, stb2.st_mode & 07777))
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perror("chmod");
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err = 0;
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} else {
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snprintf(sym, sizeof(sym), "%s%s%d", orig, odig?"p":"", i);
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err = symlink(sym, name);
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}
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if (err == 0 && stat(name, &stb2) == 0)
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add_dev(name, &stb2, 0, NULL);
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}
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}
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/*
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* We need a new md device to assemble/build/create an array.
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* 'dev' is a name given us by the user (command line or mdadm.conf)
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* It might start with /dev or /dev/md any might end with a digit
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* string.
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* If it starts with just /dev, it must be /dev/mdX or /dev/md_dX
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* If it ends with a digit string, then it must be as above, or
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* 'trustworthy' must be 'METADATA' and the 'dev' must be
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* /dev/md/'name'NN or 'name'NN
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* If it doesn't end with a digit string, it must be /dev/md/'name'
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* or 'name' or must be NULL.
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* If the digit string is present, it gives the minor number to use
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* If not, we choose a high, unused minor number.
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* If the 'dev' is a standard name, it devices whether 'md' or 'mdp'.
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* else if the name is 'd[0-9]+' then we use mdp
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* else if trustworthy is 'METADATA' we use md
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* else the choice depends on 'autof'.
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* If name is NULL it is assumed to match whatever dev provides.
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* If both name and dev are NULL, we choose a name 'mdXX' or 'mdpXX'
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*
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* If 'name' is given, and 'trustworthy' is 'foreign' and name is not
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* supported by 'dev', we add a "_%d" suffix based on the minor number
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* use that.
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*
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* If udev is configured, we create a temporary device, open it, and
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* unlink it.
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* If not, we create the /dev/mdXX device, and is name is usable,
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* /dev/md/name
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* In any case we return /dev/md/name or (if that isn't available)
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* /dev/mdXX in 'chosen'.
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*
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* When we create devices, we use uid/gid/umask from config file.
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*/
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int create_mddev(char *dev, char *name, int autof, int trustworthy,
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char *chosen)
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{
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int mdfd;
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struct stat stb;
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int num = -1;
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int use_mdp = -1;
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struct createinfo *ci = conf_get_create_info();
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int parts;
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char *cname;
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char devname[20];
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char cbuf[400];
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if (chosen == NULL)
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chosen = cbuf;
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if (autof == 0)
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autof = ci->autof;
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parts = autof >> 3;
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autof &= 7;
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strcpy(chosen, "/dev/md/");
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cname = chosen + strlen(chosen);
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if (dev) {
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if (strncmp(dev, "/dev/md/", 8) == 0) {
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strcpy(cname, dev+8);
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} else if (strncmp(dev, "/dev/", 5) == 0) {
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char *e = dev + strlen(dev);
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while (e > dev && isdigit(e[-1]))
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e--;
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if (e[0])
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num = strtoul(e, NULL, 10);
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strcpy(cname, dev+5);
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cname[e-(dev+5)] = 0;
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/* name *must* be mdXX or md_dXX in this context */
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if (num < 0 ||
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(strcmp(cname, "md") != 0 && strcmp(cname, "md_d") != 0)) {
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fprintf(stderr, Name ": %s is an invalid name "
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"for an md device. Try /dev/md/%s\n",
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dev, dev+5);
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return -1;
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}
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if (strcmp(cname, "md") == 0)
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use_mdp = 0;
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else
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use_mdp = 1;
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/* recreate name: /dev/md/0 or /dev/md/d0 */
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sprintf(cname, "%s%d", use_mdp?"d":"", num);
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} else
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strcpy(cname, dev);
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/* 'cname' must not contain a slash, and may not be
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* empty.
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*/
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if (strchr(cname, '/') != NULL) {
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fprintf(stderr, Name ": %s is an invalid name "
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"for an md device.\n", dev);
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return -1;
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}
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if (cname[0] == 0) {
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fprintf(stderr, Name ": %s is an invalid name "
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"for an md device (empty!).", dev);
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return -1;
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}
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if (num < 0) {
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/* If cname is 'N' or 'dN', we get dev number
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* from there.
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*/
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char *sp = cname;
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char *ep;
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if (cname[0] == 'd')
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sp++;
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num = strtoul(sp, &ep, 10);
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if (ep == sp || *ep || num < 0)
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num = -1;
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else if (cname[0] == 'd')
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use_mdp = 1;
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else
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use_mdp = 0;
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}
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}
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/* Now determine device number */
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/* named 'METADATA' cannot use 'mdp'. */
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if (name && name[0] == 0)
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name = NULL;
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if (name && trustworthy == METADATA && use_mdp == 1) {
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fprintf(stderr, Name ": %s is not allowed for a %s container. "
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"Consider /dev/md%d.\n", dev, name, num);
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return -1;
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}
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if (name && trustworthy == METADATA)
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use_mdp = 0;
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if (use_mdp == -1) {
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if (autof == 4 || autof == 6)
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use_mdp = 1;
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else
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use_mdp = 0;
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}
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if (num < 0 && trustworthy == LOCAL && name) {
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/* if name is numeric, possibly prefixed by
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* 'md' or '/dev/md', use that for num
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* if it is not already in use */
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char *ep;
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char *n2 = name;
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if (strncmp(n2, "/dev/", 5) == 0)
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n2 += 5;
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if (strncmp(n2, "md", 2) == 0)
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n2 += 2;
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if (*n2 == '/')
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n2++;
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num = strtoul(n2, &ep, 10);
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if (ep == n2 || *ep)
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num = -1;
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else if (mddev_busy(use_mdp ? (-1-num) : num))
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num = -1;
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}
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if (num < 0) {
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/* need to choose a free number. */
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num = find_free_devnum(use_mdp);
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if (num == NoMdDev) {
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fprintf(stderr, Name ": No avail md devices - aborting\n");
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return -1;
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}
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} else {
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num = use_mdp ? (-1-num) : num;
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if (mddev_busy(num)) {
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fprintf(stderr, Name ": %s is already in use.\n",
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dev);
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return -1;
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}
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}
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if (num < 0)
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sprintf(devname, "/dev/md_d%d", -1-num);
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else
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sprintf(devname, "/dev/md%d", num);
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if (cname[0] == 0 && name) {
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/* Need to find a name if we can
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* We don't completely trust 'name'. Truncate to
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* reasonable length and remove '/'
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*/
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char *cp;
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struct map_ent *map = NULL;
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int conflict = 1;
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int unum = 0;
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int cnlen;
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strncpy(cname, name, 200);
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cname[200] = 0;
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while ((cp = strchr(cname, '/')) != NULL)
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*cp = '-';
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if (trustworthy == LOCAL ||
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(trustworthy == FOREIGN && strchr(cname, ':') != NULL)) {
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/* Only need suffix if there is a conflict */
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if (map_by_name(&map, cname) == NULL)
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conflict = 0;
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}
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cnlen = strlen(cname);
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while (conflict) {
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if (trustworthy == METADATA && !isdigit(cname[cnlen-1]))
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sprintf(cname+cnlen, "%d", unum);
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else
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/* add _%d to FOREIGN array that don't
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* a 'host:' prefix
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*/
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sprintf(cname+cnlen, "_%d", unum);
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unum++;
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if (map_by_name(&map, cname) == NULL)
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conflict = 0;
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}
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}
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if (cname[0] == 0)
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strcpy(chosen, devname);
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/* We have a device number and name.
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* If we cannot detect udev, we need to make
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* devices and links ourselves.
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*/
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if (stat("/dev/.udev", &stb) != 0 ||
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check_env("MDADM_NO_UDEV")) {
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/* Make sure 'devname' exists and 'chosen' is a symlink to it */
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if (lstat(devname, &stb) == 0) {
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/* Must be the correct device, else error */
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if ((stb.st_mode&S_IFMT) != S_IFBLK ||
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stb.st_rdev != makedev(dev2major(num),dev2minor(num))) {
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fprintf(stderr, Name ": %s exists but looks wrong, please fix\n",
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devname);
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return -1;
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}
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} else {
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if (mknod(devname, S_IFBLK|0600,
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makedev(dev2major(num),dev2minor(num))) != 0) {
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fprintf(stderr, Name ": failed to create %s\n",
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devname);
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return -1;
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}
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if (chown(devname, ci->uid, ci->gid))
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perror("chown");
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if (chmod(devname, ci->mode))
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perror("chmod");
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stat(devname, &stb);
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add_dev(devname, &stb, 0, NULL);
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}
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if (use_mdp == 1)
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make_parts(devname, parts);
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if (strcmp(chosen, devname) != 0) {
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if (mkdir("/dev/md",0700)==0) {
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if (chown("/dev/md", ci->uid, ci->gid))
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perror("chown /dev/md");
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if (chmod("/dev/md", ci->mode| ((ci->mode>>2) & 0111)))
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perror("chmod /dev/md");
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}
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if (dev && strcmp(chosen, dev) == 0)
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/* We know we are allowed to use this name */
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unlink(chosen);
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if (lstat(chosen, &stb) == 0) {
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char buf[300];
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if ((stb.st_mode & S_IFMT) != S_IFLNK ||
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readlink(chosen, buf, 300) <0 ||
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strcmp(buf, devname) != 0) {
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fprintf(stderr, Name ": %s exists - ignoring\n",
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chosen);
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strcpy(chosen, devname);
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}
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} else if (symlink(devname, chosen) != 0)
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fprintf(stderr, Name ": failed to create %s: %s\n",
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chosen, strerror(errno));
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if (use_mdp && strcmp(chosen, devname) != 0)
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make_parts(chosen, parts);
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}
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}
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mdfd = open_dev_excl(num);
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if (mdfd < 0)
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fprintf(stderr, Name ": unexpected failure opening %s\n",
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devname);
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return mdfd;
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}
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/* Open this and check that it is an md device.
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* On success, return filedescriptor.
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* On failure, return -1 if it doesn't exist,
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* or -2 if it exists but is not an md device.
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*/
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int open_mddev(char *dev, int report_errors)
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{
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int mdfd = open(dev, O_RDWR);
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if (mdfd < 0) {
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if (report_errors)
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fprintf(stderr, Name ": error opening %s: %s\n",
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dev, strerror(errno));
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return -1;
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}
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if (md_get_version(mdfd) <= 0) {
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close(mdfd);
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if (report_errors)
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fprintf(stderr, Name ": %s does not appear to be "
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"an md device\n", dev);
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return -2;
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}
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return mdfd;
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}
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