*/
#include "mdadm.h"
+#include "dlink.h"
#include <ctype.h>
/* This fill contains various 'library' style function. They
return mdp_major;
}
-
-void fmt_devname(char *name, int num)
-{
- if (num >= 0)
- sprintf(name, "md%d", num);
- else
- sprintf(name, "md_d%d", -1-num);
-}
-
-char *devnum2devname(int num)
+char *devid2kname(int devid)
{
- char name[100];
- fmt_devname(name,num);
- return xstrdup(name);
-}
+ char path[30];
+ char link[200];
+ static char devnm[32];
+ char *cp;
+ int n;
-int devname2devnum(char *name)
-{
- char *ep;
- int num;
- if (strncmp(name, "md_d", 4)==0)
- num = -1-strtoul(name+4, &ep, 10);
- else
- num = strtoul(name+2, &ep, 10);
- return num;
+ /* Look at the
+ * /sys/dev/block/%d:%d link which must look like
+ * and take the last component.
+ */
+ sprintf(path, "/sys/dev/block/%d:%d", major(devid),
+ minor(devid));
+ n = readlink(path, link, sizeof(link)-1);
+ if (n > 0) {
+ link[n] = 0;
+ cp = strrchr(link, '/');
+ if (cp) {
+ strcpy(devnm, cp+1);
+ return devnm;
+ }
+ }
+ return NULL;
}
-int stat2devnum(struct stat *st)
+char *devid2devnm(int devid)
{
char path[30];
char link[200];
- char *cp;
+ static char devnm[32];
+ char *cp, *ep;
int n;
- if ((S_IFMT & st->st_mode) == S_IFBLK) {
- if (major(st->st_rdev) == MD_MAJOR)
- return minor(st->st_rdev);
- else if (major(st->st_rdev) == (unsigned)get_mdp_major())
- return -1- (minor(st->st_rdev)>>MdpMinorShift);
-
- /* must be an extended-minor partition. Look at the
- * /sys/dev/block/%d:%d link which must look like
- * ../../block/mdXXX/mdXXXpYY
- */
- sprintf(path, "/sys/dev/block/%d:%d", major(st->st_rdev),
- minor(st->st_rdev));
- n = readlink(path, link, sizeof(link)-1);
- if (n <= 0)
- return NoMdDev;
+ /* Might be an extended-minor partition or a
+ * named md device. Look at the
+ * /sys/dev/block/%d:%d link which must look like
+ * ../../block/mdXXX/mdXXXpYY
+ * or
+ * ...../block/md_FOO
+ */
+ sprintf(path, "/sys/dev/block/%d:%d", major(devid),
+ minor(devid));
+ n = readlink(path, link, sizeof(link)-1);
+ if (n > 0) {
link[n] = 0;
- cp = strrchr(link, '/');
- if (cp) *cp = 0;
- cp = strrchr(link, '/');
- if (cp && strncmp(cp, "/md", 3) == 0)
- return devname2devnum(cp+1);
+ cp = strstr(link, "/block/");
+ if (cp) {
+ cp += 7;
+ ep = strchr(cp, '/');
+ if (ep)
+ *ep = 0;
+ strcpy(devnm, cp);
+ return devnm;
+ }
}
- return NoMdDev;
+ if (major(devid) == MD_MAJOR)
+ sprintf(devnm,"md%d", minor(devid));
+ else if (major(devid) == (unsigned)get_mdp_major())
+ sprintf(devnm,"md_d%d",
+ (minor(devid)>>MdpMinorShift));
+ else
+ return NULL;
+ return devnm;
+}
+char *stat2devnm(struct stat *st)
+{
+ if ((S_IFMT & st->st_mode) != S_IFBLK)
+ return NULL;
+ return devid2devnm(st->st_rdev);
}
-int fd2devnum(int fd)
+char *fd2devnm(int fd)
{
struct stat stb;
if (fstat(fd, &stb) == 0)
- return stat2devnum(&stb);
- return NoMdDev;
+ return stat2devnm(&stb);
+ return NULL;
}
-
-
/*
* convert a major/minor pair for a block device into a name in /dev, if possible.
* On the first call, walk /dev collecting name.
* Put them in a simple linked listfor now.
*/
struct devmap {
- int major, minor;
- char *name;
- struct devmap *next;
+ int major, minor;
+ char *name;
+ struct devmap *next;
} *devlist = NULL;
int devlist_ready = 0;
return preferred ? preferred : regular;
}
-
-
/* conf_word gets one word from the conf file.
* if "allow_key", then accept words at the start of a line,
* otherwise stop when such a word is found.
}
}
}
+
+int check_env(char *name)
+{
+ char *val = getenv(name);
+
+ if (val && atoi(val) == 1)
+ return 1;
+
+ return 0;
+}
+
+int use_udev(void)
+{
+ static int use = -1;
+ struct stat stb;
+
+ if (use < 0) {
+ use = ((stat("/dev/.udev", &stb) == 0
+ || stat("/run/udev", &stb) == 0)
+ && check_env("MDADM_NO_UDEV") == 0);
+ }
+ return use;
+}
+
+unsigned long GCD(unsigned long a, unsigned long b)
+{
+ while (a != b) {
+ if (a < b)
+ b -= a;
+ if (b < a)
+ a -= b;
+ }
+ return a;
+}
+
+/*
+ * conf_line reads one logical line from the conffile or mdstat.
+ * It skips comments and continues until it finds a line that starts
+ * with a non blank/comment. This character is pushed back for the next call
+ * A doubly linked list of words is returned.
+ * the first word will be a keyword. Other words will have had quotes removed.
+ */
+
+char *conf_line(FILE *file)
+{
+ char *w;
+ char *list;
+
+ w = conf_word(file, 1);
+ if (w == NULL) return NULL;
+
+ list = dl_strdup(w);
+ free(w);
+ dl_init(list);
+
+ while ((w = conf_word(file,0))){
+ char *w2 = dl_strdup(w);
+ free(w);
+ dl_add(list, w2);
+ }
+/* printf("got a line\n");*/
+ return list;
+}
+
+void free_line(char *line)
+{
+ char *w;
+ for (w=dl_next(line); w != line; w=dl_next(line)) {
+ dl_del(w);
+ dl_free(w);
+ }
+ dl_free(line);
+}
projects / thirdparty / mdadm.git / blobdiff