/*
* 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
*/
#include "mdadm.h"
+#include "udev.h"
#include "md_p.h"
#include <ctype.h>
int nlen = strlen(dev) + 20;
char *name;
int dig = isdigit(dev[strlen(dev)-1]);
- char orig[1024];
+ char orig[1001];
char sym[1024];
int err;
minor_num = minor(stb.st_rdev);
odig = -1;
} else if (S_ISLNK(stb.st_mode)) {
- int len = readlink(dev, orig, sizeof(orig));
- if (len < 0 || len > 1000)
+ int len;
+
+ len = readlink(dev, orig, sizeof(orig));
+ if (len < 0 || len >= (int)sizeof(orig))
return;
orig[len] = 0;
odig = isdigit(orig[len-1]);
free(name);
}
+int create_named_array(char *devnm)
+{
+ int fd;
+ int n = -1;
+ static const char new_array_file[] = {
+ "/sys/module/md_mod/parameters/new_array"
+ };
+
+ fd = open(new_array_file, O_WRONLY);
+ if (fd < 0 && errno == ENOENT) {
+ if (system("modprobe md_mod") == 0)
+ fd = open(new_array_file, O_WRONLY);
+ }
+ if (fd >= 0) {
+ n = write(fd, devnm, strlen(devnm));
+ close(fd);
+ }
+ if (fd < 0 || n != (int)strlen(devnm)) {
+ pr_err("Fail to create %s when using %s, fallback to creation via node\n",
+ devnm, new_array_file);
+ return 0;
+ }
+
+ return 1;
+}
+
/*
* We need a new md device to assemble/build/create an array.
* 'dev' is a name given us by the user (command line or mdadm.conf)
*
* 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 create_mddev(char *dev, char *name, int autof, int trustworthy,
- char *chosen)
+ char *chosen, int block_udev)
{
int mdfd;
struct stat stb;
struct createinfo *ci = conf_get_create_info();
int parts;
char *cname;
- char devname[20];
+ char devname[37];
+ char devnm[32];
char cbuf[400];
+
+ if (!udev_is_available())
+ block_udev = 0;
+
if (chosen == NULL)
chosen = cbuf;
parts = autof >> 3;
autof &= 7;
- strcpy(chosen, "/dev/md/");
+ strcpy(chosen, DEV_MD_DIR);
cname = chosen + strlen(chosen);
if (dev) {
- if (strncmp(dev, "/dev/md/", 8) == 0) {
- strcpy(cname, dev+8);
+ if (strncmp(dev, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
+ snprintf(cname, MD_NAME_MAX, "%s", dev + DEV_MD_DIR_LEN);
} else if (strncmp(dev, "/dev/", 5) == 0) {
char *e = dev + strlen(dev);
while (e > dev && isdigit(e[-1]))
e--;
if (e[0])
num = strtoul(e, NULL, 10);
- strcpy(cname, dev+5);
+ snprintf(cname, MD_NAME_MAX, "%s", dev + 5);
cname[e-(dev+5)] = 0;
/* 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!).\n", dev);
return -1;
}
if (num < 0) {
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) {
+ sprintf(devnm, "md_%s", cname);
+ if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS)
+ return -1;
+ if (!create_named_array(devnm)) {
+ devnm[0] = 0;
+ udev_unblock();
+ }
+ }
+ if (num >= 0) {
+ sprintf(devnm, "md%d", num);
+ if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS)
+ return -1;
+ if (!create_named_array(devnm)) {
+ devnm[0] = 0;
+ udev_unblock();
+ }
+ }
+ if (devnm[0] == 0) {
+ 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;
+ }
+ }
+ if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS)
+ return -1;
+ create_named_array(devnm);
+ }
+
+ 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 (!use_udev()) {
+ if (!udev_is_available()) {
/* 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 != 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(devname, parts);
if (strcmp(chosen, devname) != 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 (mkdir(DEV_NUM_PREF, 0700) == 0) {
+ if (chown(DEV_NUM_PREF, ci->uid, ci->gid))
+ perror("chown " DEV_NUM_PREF);
+ if (chmod(DEV_NUM_PREF, ci->mode | ((ci->mode >> 2) & 0111)))
+ perror("chmod " DEV_NUM_PREF);
}
if (dev && strcmp(chosen, dev) == 0)
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);
*/
int open_mddev(char *dev, int report_errors)
{
- int mdfd = open(dev, O_RDWR);
- if (mdfd < 0 && errno == EACCES)
- mdfd = open(dev, O_RDONLY);
+ int mdfd = open(dev, O_RDONLY);
+
if (mdfd < 0) {
if (report_errors)
pr_err("error opening %s: %s\n",
dev, strerror(errno));
return -1;
}
- if (md_get_version(mdfd) <= 0) {
+
+ if (md_array_valid(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;
}
+
+/**
+ * is_mddev() - check that file name passed is an md device.
+ * @dev: file name that has to be checked.
+ * Return: 1 if file passed is an md device, 0 if not.
+ */
+int is_mddev(char *dev)
+{
+ int fd = open_mddev(dev, 1);
+
+ if (fd >= 0) {
+ close(fd);
+ return 1;
+ }
+
+ return 0;
+}
+
+char *find_free_devnm(int use_partitions)
+{
+ static char devnm[32];
+ int devnum;
+ for (devnum = 127; devnum != 128;
+ devnum = devnum ? devnum-1 : (1<<9)-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 (!udev_is_available()) {
+ /* make sure it is new to /dev too, at least as a
+ * non-standard */
+ dev_t 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