/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
#include "md_p.h"
#include <ctype.h>
-void make_parts(char *dev, int cnt)
+
+void make_dev_symlink(char *dev)
+{
+ char *new = strdup(dev);
+
+ if (!new) return;
+ /* /dev/md/0 -> /dev/md0
+ * /dev/md/d0 -> /dev/md_d0
+ */
+ if (isdigit(new[8]))
+ strcpy(new+7, new+8);
+ else
+ new[7] = '_';
+ if (symlink(dev+5, new))
+ perror(new);
+}
+
+
+void make_parts(char *dev, int cnt, int symlinks)
{
/* make 'cnt' partition devices for 'dev'
* We use the major/minor from dev and add 1..cnt
char *name = malloc(nlen);
int dig = isdigit(dev[strlen(dev)-1]);
+ if (cnt==0) cnt=4;
if (stat(dev, &stb)!= 0)
return;
if (!S_ISBLK(stb.st_mode))
} 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);
+ if (mknod(name, S_IFBLK | 0600, makedev(major, minor+i)))
+ perror("mknod");
+ if (chown(name, stb2.st_uid, stb2.st_gid))
+ perror("chown");
+ if (chmod(name, stb2.st_mode & 07777))
+ perror("chmod");
+ if (symlinks && strncmp(name, "/dev/md/", 8) == 0)
+ make_dev_symlink(name);
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 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
+ * Default ownership/mode comes from config file.
*/
int open_mddev(char *dev, int autof)
{
int must_remove = 0;
struct mdstat_ent *mdlist;
int num;
+ struct createinfo *ci = conf_get_create_info();
+ int parts;
+
+ if (autof == 0)
+ autof = ci->autof;
- if (autof) {
+ parts = autof >> 3;
+ autof &= 7;
+
+ if (autof && autof != 1) {
/* 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;
- }
+ int std;
stb.st_mode = 0;
if (stat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) {
fprintf(stderr, Name ": %s is not a block device.\n",
return -1;
}
/* check major number is correct */
- if (autof>0)
- major = get_mdp_major();
+ num = -1;
+ std = is_standard(dev, &num);
+ if (std>0) major = get_mdp_major();
+ switch(autof) {
+ case 2: /* only create is_standard names */
+ if (!std && !stb.st_mode) {
+ fprintf(stderr, Name
+ ": %s does not exist and is not a 'standard' name "
+ "so it cannot be created\n", dev);
+ return -1;
+ }
+ break;
+ case 3: /* create md, reject std>0 */
+ if (std > 0) {
+ fprintf(stderr, Name ": that --auto option "
+ "not compatable with device named %s\n", dev);
+ return -1;
+ }
+ break;
+ case 4: /* create mdp, reject std<0 */
+ if (std < 0) {
+ fprintf(stderr, Name ": that --auto option "
+ "not compatable with device named %s\n", dev);
+ return -1;
+ }
+ break;
+ case 5: /* default to md if not standard */
+ break;
+ case 6: /* default to mdp if not standard */
+ if (std == 0) major = get_mdp_major();
+ break;
+ }
+ /* major is final. num is -1 if not standard */
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) {
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;
- }
+ if (major != MD_MAJOR && parts > 0)
+ make_parts(dev, parts, ci->symlinks);
+ return mdfd;
}
/* Ok, need to find a minor that is not in use.
* If the device name is in a 'standard' format,
* 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 */
+ if (num < 0) {
+ /* need to pick an unused number */
mdlist = mdstat_read(0, 0);
- for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) {
+ /* Choose a large number. Start from 127 and search down,
+ * but if nothing is found, start really big
+ */
+ for (num = 127 ; num != 128 ; num = num ? num-1 : (1<<22)-1) {
struct mdstat_ent *me;
+ int devnum = num;
+ if (major != MD_MAJOR)
+ devnum = -1-num;
+
for (me=mdlist; me; me=me->next)
- if (me->devnum == num)
+ if (me->devnum == devnum)
break;
if (!me) {
- /* doesn't exist if mdstat.
+ /* doesn't exist in mdstat.
* make sure it is new to /dev too
*/
char *dn;
- if (autof > 0)
- minor = (-1-num) << MdpMinorShift;
+ if (major != MD_MAJOR)
+ minor = num << MdpMinorShift;
else
minor = num;
- dn = map_dev(major,minor);
+ dn = map_dev(major,minor, 0);
if (dn==NULL || is_standard(dn, NULL)) {
/* this number only used by a 'standard' name,
* so it is safe to use
}
}
}
- }
+ } else if (major == MD_MAJOR)
+ minor = num;
+ else
+ minor = num << MdpMinorShift;
/* 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 (must_remove)
unlink(dev);
+ if (strncmp(dev, "/dev/md/", 8) == 0) {
+ if (mkdir("/dev/md",0700)==0) {
+ if (chown("/dev/md", ci->uid, ci->gid))
+ perror("chown /dev/md");
+ if (chmod("/dev/md", ci->mode| ((ci->mode>>2) & 0111)))
+ perror("chmod /dev/md");
+ }
+ }
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);
+ if (chown(dev, stb.st_uid, stb.st_gid))
+ perror("chown");
+ if (chmod(dev, stb.st_mode & 07777))
+ perror("chmod");
+ } else {
+ if (chown(dev, ci->uid, ci->gid))
+ perror("chown");
+ if (chmod(dev, ci->mode))
+ perror("chmod");
}
stat(dev, &stb);
add_dev(dev, &stb, 0, NULL);
- make_parts(dev,autof);
+ if (ci->symlinks && strncmp(dev, "/dev/md/", 8) == 0)
+ make_dev_symlink(dev);
+ if (major != MD_MAJOR)
+ make_parts(dev,parts, ci->symlinks);
}
}
mdfd = open(dev, O_RDWR, 0);
projects / thirdparty / mdadm.git / blobdiff