-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;
- char *name = malloc(strlen(dev) + 20);
- 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;
- sprintf(name, "%s%s%d", dev, dig?"_p":"", i);
- if (stat(name, &stb2)==0) {
- if (!S_ISBLK(stb2.st_mode))
- continue;
- if (stb2.st_rdev == MKDEV(major, minor+i))
- continue;
- unlink(name);
- } else {
- stb2 = stb;
- }
- mknod(name, S_IFBLK | 0600, MKDEV(major, minor+i));
- chown(name, stb2.st_uid, stb2.st_gid);
- chmod(name, stb2.st_mode & 07777);
- }
-}
-
-/*
- * 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 few 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;
- 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
- */
- stb.st_mode = 0;
- if (lstat(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.
- * Easiest to read /proc/mdstat, and hunt through for
- * 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)) {
- /* this number only used by a 'standard' name,
- * so it is safe to use
- */
- break;
- }
- }
- }
- /* 'num' is the number to use, >=0 for md, <0 for mdp */
- if (must_remove) {
- /* never remove a device name that ends /mdNN or /dNN,
- * that would be confusing
- */
- if (is_standard(dev)) {
- fprintf(stderr, Name ": --auto refusing to remove %s as it looks like a standard name.\n",
- dev);
- return -1;
- }
- unlink(dev);
- }
-
- if (mknod(dev, S_IFBLK|0600, MKDEV(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);
- }
- 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;
-}
-
-
-