/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2001-2012 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
*
* If udev is configured, we create a temporary device, open it, and
* unlink it.
- * If not, we create the /dev/mdXX device, and is name is usable,
+ * If not, we create the /dev/mdXX device, and if name is usable,
* /dev/md/name
* In any case we return /dev/md/name or (if that isn't available)
* /dev/mdXX in 'chosen'.
int parts;
char *cname;
char devname[20];
+ char devnm[32];
char cbuf[400];
if (chosen == NULL)
chosen = cbuf;
/* name *must* be mdXX or md_dXX in this context */
if (num < 0 ||
(strcmp(cname, "md") != 0 && strcmp(cname, "md_d") != 0)) {
- pr_err("%s is an invalid name "
- "for an md device. Try /dev/md/%s\n",
+ pr_err("%s is an invalid name for an md device. Try /dev/md/%s\n",
dev, dev+5);
return -1;
}
* empty.
*/
if (strchr(cname, '/') != NULL) {
- pr_err("%s is an invalid name "
- "for an md device.\n", dev);
+ pr_err("%s is an invalid name for an md device.\n", dev);
return -1;
}
if (cname[0] == 0) {
- pr_err("%s is an invalid name "
- "for an md device (empty!).", dev);
+ pr_err("%s is an invalid name for an md device (empty!).", dev);
return -1;
}
if (num < 0) {
char *ep;
if (cname[0] == 'd')
sp++;
- num = strtoul(sp, &ep, 10);
+ if (isdigit(sp[0]))
+ num = strtoul(sp, &ep, 10);
+ else
+ ep = sp;
if (ep == sp || *ep || num < 0)
num = -1;
else if (cname[0] == 'd')
if (name && name[0] == 0)
name = NULL;
if (name && trustworthy == METADATA && use_mdp == 1) {
- pr_err("%s is not allowed for a %s container. "
- "Consider /dev/md%d.\n", dev, name, num);
+ pr_err("%s is not allowed for a %s container. Consider /dev/md%d.\n", dev, name, num);
return -1;
}
if (name && trustworthy == METADATA)
num = strtoul(n2, &ep, 10);
if (ep == n2 || *ep)
num = -1;
- else if (mddev_busy(use_mdp ? (-1-num) : num))
- num = -1;
- }
-
- if (num < 0) {
- /* need to choose a free number. */
- num = find_free_devnum(use_mdp);
- if (num == NoMdDev) {
- pr_err("No avail md devices - aborting\n");
- return -1;
- }
- } else {
- num = use_mdp ? (-1-num) : num;
- if (mddev_busy(num)) {
- pr_err("%s is already in use.\n",
- dev);
- return -1;
+ else {
+ sprintf(devnm, "md%s%d", use_mdp ? "_d":"", num);
+ if (mddev_busy(devnm))
+ num = -1;
}
}
- if (num < 0)
- sprintf(devname, "/dev/md_d%d", -1-num);
- else
- sprintf(devname, "/dev/md%d", num);
-
if (cname[0] == 0 && name) {
/* Need to find a name if we can
* We don't completely trust 'name'. Truncate to
}
}
+ devnm[0] = 0;
+ if (num < 0 && cname && ci->names) {
+ int fd;
+ int n = -1;
+ sprintf(devnm, "md_%s", cname);
+ fd = open("/sys/module/md_mod/parameters/new_array", O_WRONLY);
+ if (fd >= 0) {
+ n = write(fd, devnm, strlen(devnm));
+ close(fd);
+ }
+ if (n < 0)
+ devnm[0] = 0;
+ }
+ if (devnm[0])
+ ;
+ else if (num < 0) {
+ /* need to choose a free number. */
+ char *_devnm = find_free_devnm(use_mdp);
+ if (devnm == NULL) {
+ pr_err("No avail md devices - aborting\n");
+ return -1;
+ }
+ strcpy(devnm, _devnm);
+ } else {
+ sprintf(devnm, "%s%d", use_mdp?"md_d":"md", num);
+ if (mddev_busy(devnm)) {
+ pr_err("%s is already in use.\n",
+ dev);
+ return -1;
+ }
+ }
+
+ sprintf(devname, "/dev/%s", devnm);
+
if (dev && dev[0] == '/')
strcpy(chosen, dev);
else if (cname[0] == 0)
* If we cannot detect udev, we need to make
* devices and links ourselves.
*/
- if ((stat("/dev/.udev", &stb) != 0 && stat("/run/udev", &stb) != 0) ||
- check_env("MDADM_NO_UDEV")) {
+ if (!use_udev()) {
/* Make sure 'devname' exists and 'chosen' is a symlink to it */
if (lstat(devname, &stb) == 0) {
/* Must be the correct device, else error */
if ((stb.st_mode&S_IFMT) != S_IFBLK ||
- stb.st_rdev != makedev(dev2major(num),dev2minor(num))) {
+ stb.st_rdev != (dev_t)devnm2devid(devnm)) {
pr_err("%s exists but looks wrong, please fix\n",
devname);
return -1;
}
} else {
if (mknod(devname, S_IFBLK|0600,
- makedev(dev2major(num),dev2minor(num))) != 0) {
+ devnm2devid(devnm)) != 0) {
pr_err("failed to create %s\n",
devname);
return -1;
make_parts(chosen, parts);
}
}
- mdfd = open_dev_excl(num);
+ mdfd = open_dev_excl(devnm);
if (mdfd < 0)
pr_err("unexpected failure opening %s\n",
devname);
if (md_get_version(mdfd) <= 0) {
close(mdfd);
if (report_errors)
- pr_err("%s does not appear to be "
- "an md device\n", dev);
+ pr_err("%s does not appear to be an md device\n", dev);
return -2;
}
return mdfd;
}
+
+char *find_free_devnm(int use_partitions)
+{
+ static char devnm[32];
+ int devnum;
+ for (devnum = 127; devnum != 128;
+ devnum = devnum ? devnum-1 : (1<<20)-1) {
+
+ if (use_partitions)
+ sprintf(devnm, "md_d%d", devnum);
+ else
+ sprintf(devnm, "md%d", devnum);
+ if (mddev_busy(devnm))
+ continue;
+ if (!conf_name_is_free(devnm))
+ continue;
+ if (!use_udev()) {
+ /* make sure it is new to /dev too, at least as a
+ * non-standard */
+ int devid = devnm2devid(devnm);
+ if (devid) {
+ char *dn = map_dev(major(devid),
+ minor(devid), 0);
+ if (dn && ! is_standard(dn, NULL))
+ continue;
+ }
+ }
+ break;
+ }
+ if (devnum == 128)
+ return NULL;
+ return devnm;
+}
projects / thirdparty / mdadm.git / blobdiff