#include <ctype.h>
-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)
+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 is a device name we use the
+ * major/minor from dev and add 1..cnt
+ * If it is a symlink, we make similar symlinks.
* 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_num, minor_num;
+ int major_num = major_num; /* quiet gcc -Os unitialized warning */
+ int minor_num = minor_num; /* quiet gcc -Os unitialized warning */
+ int odig = odig; /* quiet gcc -Os unitialized warning */
int i;
int nlen = strlen(dev) + 20;
char *name = malloc(nlen);
int dig = isdigit(dev[strlen(dev)-1]);
+ char orig[1024];
+ char sym[1024];
+ int err;
if (cnt==0) cnt=4;
- if (stat(dev, &stb)!= 0)
- return;
- if (!S_ISBLK(stb.st_mode))
+ if (lstat(dev, &stb)!= 0)
return;
- major_num = major(stb.st_rdev);
- minor_num = minor(stb.st_rdev);
+ if (S_ISLNK(stb.st_mode)) {
+ int len = readlink(dev, orig, sizeof(orig));
+ if (len < 0 || len > 1000)
+ return;
+ orig[len] = 0;
+ odig = isdigit(orig[len-1]);
+ } else if (S_ISBLK(stb.st_mode)) {
+ major_num = major(stb.st_rdev);
+ minor_num = minor(stb.st_rdev);
+ } else
+ return;
for (i=1; i <= cnt ; i++) {
struct stat stb2;
snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i);
} else {
stb2 = stb;
}
- if (mknod(name, S_IFBLK | 0600, makedev(major_num, minor_num+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);
+ if (S_ISBLK(stb.st_mode)) {
+ if (mknod(name, S_IFBLK | 0600,
+ makedev(major_num, minor_num+i)))
+ perror("mknod");
+ if (chown(name, stb2.st_uid, stb2.st_gid))
+ perror("chown");
+ if (chmod(name, stb2.st_mode & 07777))
+ perror("chmod");
+ err = 0;
+ } else {
+ snprintf(sym, sizeof(sym), "%s%s%d", orig, odig?"p":"", i);
+ err = symlink(sym, name);
+ }
+
+ if (err == 0 && stat(name, &stb2) == 0)
+ add_dev(name, &stb2, 0, NULL);
}
}
use_mdp = 0;
else
use_mdp = 1;
+ /* recreate name: /dev/md/0 or /dev/md/d0 */
+ sprintf(cname, "%s%d", use_mdp?"d":"", num);
} else
strcpy(cname, dev);
- /* 'cname' must not contain a slash, may not start or end
- * with a digit, and may only be empty if num is present.
+ /* 'cname' must not contain a slash, and may not be
+ * empty.
*/
- if (strchr(cname, '/') != NULL ||
- isdigit(cname[0]) ||
- (cname[0] && isdigit(cname[strlen(cname)]))
- ) {
+ if (strchr(cname, '/') != NULL) {
fprintf(stderr, Name ": %s is an invalid name "
"for an md device.\n", dev);
return -1;
}
- if (cname[0] == 0 && num < 0) {
+ if (cname[0] == 0) {
fprintf(stderr, Name ": %s is an invalid name "
"for an md device (empty!).", dev);
return -1;
}
+ if (num < 0) {
+ /* If cname is 'N' or 'dN', we get dev number
+ * from there.
+ */
+ char *sp = cname;
+ char *ep;
+ if (cname[0] == 'd')
+ sp++;
+ num = strtoul(sp, &ep, 10);
+ if (ep == sp || *ep || num < 0)
+ num = -1;
+ else if (cname[0] == 'd')
+ use_mdp = 1;
+ else
+ use_mdp = 0;
+ }
}
/* Now determine device number */
use_mdp = 0;
}
if (num < 0 && trustworthy == LOCAL && name) {
- /* if name is numeric, us that for num */
+ /* if name is numeric, use that for num
+ * if it is not already in use */
char *ep;
num = strtoul(name, &ep, 10);
if (ep == name || *ep)
num = -1;
+ else if (mddev_busy(use_mdp ? (-1-num) : num))
+ num = -1;
}
if (num < 0) {
* reasonable length and remove '/'
*/
char *cp;
+ struct map_ent *map = NULL;
+ int conflict = 1;
+ int unum = 0;
+ int cnlen;
strncpy(cname, name, 200);
cname[200] = 0;
while ((cp = strchr(cname, '/')) != NULL)
*cp = '-';
- if (trustworthy == METADATA)
- /* always add device number to metadata */
- sprintf(cname+strlen(cname), "%d", num);
- else if (trustworthy == FOREIGN &&
- strchr(cname, ':') == NULL)
- /* add _%d to FOREIGN array that don't have
- * a 'host:' prefix
- */
- sprintf(cname+strlen(cname), "_%d", num<0?(-1-num):num);
+ if (trustworthy == LOCAL ||
+ (trustworthy == FOREIGN && strchr(cname, ':') != NULL)) {
+ /* Only need suffix if there is a conflict */
+ if (map_by_name(&map, cname) == NULL)
+ conflict = 0;
+ }
+ cnlen = strlen(cname);
+ while (conflict) {
+ if (trustworthy == METADATA && !isdigit(cname[cnlen-1]))
+ sprintf(cname+cnlen, "%d", unum);
+ else
+ /* add _%d to FOREIGN array that don't
+ * a 'host:' prefix
+ */
+ sprintf(cname+cnlen, "_%d", unum);
+ unum++;
+ if (map_by_name(&map, cname) == NULL)
+ conflict = 0;
+ }
}
if (cname[0] == 0)
strcpy(chosen, devname);
/* We have a device number and name.
- * If we can detect udev, just open the device and we
- * are done.
+ * If we cannot detect udev, we need to make
+ * devices and links ourselves.
*/
if (stat("/dev/.udev", &stb) != 0 ||
check_env("MDADM_NO_UDEV")) {
stat(devname, &stb);
add_dev(devname, &stb, 0, NULL);
}
+ if (use_mdp == 1)
+ make_parts(devname, parts);
if (strcmp(chosen, devname) != 0) {
if (mkdir("/dev/md",0700)==0) {
chosen);
strcpy(chosen, devname);
}
- } else
- symlink(devname, chosen);
+ } else if (symlink(devname, chosen) != 0)
+ fprintf(stderr, Name ": failed to create %s: %s\n",
+ chosen, strerror(errno));
+ if (use_mdp && strcmp(chosen, devname) != 0)
+ make_parts(chosen, parts);
}
}
mdfd = open_dev_excl(num);
}
return mdfd;
}
-
-
-int create_mddev_devnum(char *devname, int devnum, char *name,
- char *chosen_name, int parts)
-{
- /* Open the md device with number 'devnum', possibly using 'devname',
- * possibly constructing a name with 'name', but in any case, copying
- * the name into 'chosen_name'
- */
- int major_num, minor_num;
- struct stat stb;
- int i;
- struct createinfo *ci = conf_get_create_info();
-
- if (devname)
- strcpy(chosen_name, devname);
- else if (name && *name && name[0] && strchr(name,'/') == NULL) {
- char *n = strchr(name, ':');
- if (n) n++; else n = name;
- if (isdigit(*n) && devnum < 0)
- sprintf(chosen_name, "/dev/md/d%s", n);
- else
- sprintf(chosen_name, "/dev/md/%s", n);
- } else {
- if (devnum >= 0)
- sprintf(chosen_name, "/dev/md%d", devnum);
- else
- sprintf(chosen_name, "/dev/md/d%d", -1-devnum);
- }
- if (devnum >= 0) {
- major_num = MD_MAJOR;
- minor_num = devnum;
- } else {
- major_num = get_mdp_major();
- minor_num = (-1-devnum) << 6;
- }
- if (stat(chosen_name, &stb) == 0) {
- /* It already exists. Check it is right. */
- if ( ! S_ISBLK(stb.st_mode) ||
- stb.st_rdev != makedev(major_num, minor_num)) {
- errno = EEXIST;
- return -1;
- }
- } else {
- /* special case: if --incremental is suggesting a name
- * in /dev/md/, we make sure the directory exists.
- */
- if (strncmp(chosen_name, "/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(chosen_name, S_IFBLK | 0600,
- makedev(major_num, minor_num)) != 0) {
- return -1;
- }
- /* FIXME chown/chmod ?? */
- }
-
- /* Simple locking to avoid --incr being called for the same
- * array multiple times in parallel.
- */
- for (i = 0; i < 25 ; i++) {
- int fd;
-
- fd = open(chosen_name, O_RDWR|O_EXCL);
- if (fd >= 0 || errno != EBUSY) {
- if (devnum < 0)
- make_parts(chosen_name, parts, ci->symlinks);
- return fd;
- }
- usleep(200000);
- }
- return -1;
-}
projects / thirdparty / mdadm.git / blobdiff