* mapfile - manage /var/run/mdadm.map. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* also allows the array device name to be easily found.
*
* The map file is line based with space separated fields. The fields are:
- * Device id - mdX or mdpX where is a number.
- * metadata - 0.90 1.0 1.1 1.2
+ * Device id - mdX or mdpX where X is a number.
+ * metadata - 0.90 1.0 1.1 1.2 ddf ...
* UUID - uuid of the array
* path - path where device created: /dev/md/home
*
+ * The preferred location for the map file is /var/run/mdadm.map.
+ * However /var/run may not exist or be writable in early boot. And if
+ * no-one has created /var/run/mdadm, we still want to survive.
+ * So possible locations are:
+ * /var/run/mdadm/map /var/run/mdadm.map /dev/.mdadm.map
+ * the last, because udev requires a writable /dev very early.
+ * We read from the first one that exists and write to the first
+ * one that we can.
*/
+#include "mdadm.h"
+#include <ctype.h>
+#define mapnames(base) { #base, #base ".new", #base ".lock"}
+char *mapname[3][3] = {
+ mapnames(/var/run/mdadm/map),
+ mapnames(/var/run/mdadm.map),
+ mapnames(/dev/.mdadm.map)
+};
-#include "mdadm.h"
+int mapmode[3] = { O_RDONLY, O_RDWR|O_CREAT, O_RDWR|O_CREAT | O_TRUNC };
+char *mapsmode[3] = { "r", "w", "w"};
+FILE *open_map(int modenum, int *choice)
+{
+ int i;
+ for (i = 0 ; i < 3 ; i++) {
+ int fd = open(mapname[i][modenum], mapmode[modenum], 0600);
+ if (fd >= 0) {
+ *choice = i;
+ return fdopen(fd, mapsmode[modenum]);
+ }
+ }
+ return NULL;
+}
int map_write(struct map_ent *mel)
{
FILE *f;
int err;
- int subdir = 1;
+ int which;
+
+ f = open_map(1, &which);
- f = fopen("/var/run/mdadm/map.new", "w");
- if (!f) {
- f = fopen("/var/run/mdadm.map.new", "w");
- subdir = 0;
- }
if (!f)
return 0;
- while (mel) {
+ for (; mel; mel = mel->next) {
+ if (mel->bad)
+ continue;
if (mel->devnum < 0)
fprintf(f, "mdp%d ", -1-mel->devnum);
else
fprintf(f, "md%d ", mel->devnum);
- fprintf(f, "%d.%d ", mel->major, mel->minor);
+ fprintf(f, "%s ", mel->metadata);
fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0],
mel->uuid[1], mel->uuid[2], mel->uuid[3]);
- fprintf(f, "%s\n", mel->path);
- mel = mel->next;
+ fprintf(f, "%s\n", mel->path?:"");
}
fflush(f);
err = ferror(f);
fclose(f);
if (err) {
- if (subdir)
- unlink("/var/run/mdadm/map.new");
- else
- unlink("/var/run/mdadm.map.new");
+ unlink(mapname[which][1]);
return 0;
}
- if (subdir)
- return rename("/var/run/mdadm/map.new",
- "/var/run/mdadm/map") == 0;
- else
- return rename("/var/run/mdadm.map.new",
- "/var/run/mdadm.map") == 0;
+ return rename(mapname[which][1],
+ mapname[which][0]) == 0;
+}
+
+
+static FILE *lf = NULL;
+static int lwhich = 0;
+int map_lock(struct map_ent **melp)
+{
+ if (lf == NULL) {
+ lf = open_map(2, &lwhich);
+ if (lf == NULL)
+ return -1;
+ if (lockf(fileno(lf), F_LOCK, 0) != 0) {
+ fclose(lf);
+ lf = NULL;
+ return -1;
+ }
+ }
+ if (*melp)
+ map_free(*melp);
+ map_read(melp);
+ return 0;
+}
+
+void map_unlock(struct map_ent **melp)
+{
+ if (lf)
+ fclose(lf);
+ unlink(mapname[lwhich][2]);
+ lf = NULL;
}
void map_add(struct map_ent **melp,
- int devnum, int major, int minor, int uuid[4], char *path)
+ int devnum, char *metadata, int uuid[4], char *path)
{
struct map_ent *me = malloc(sizeof(*me));
me->devnum = devnum;
- me->major = major;
- me->minor = minor;
+ strcpy(me->metadata, metadata);
memcpy(me->uuid, uuid, 16);
- me->path = strdup(path);
+ me->path = path ? strdup(path) : NULL;
me->next = *melp;
+ me->bad = 0;
*melp = me;
}
FILE *f;
char buf[8192];
char path[200];
- int devnum, major, minor, uuid[4];
+ int devnum, uuid[4];
+ char metadata[30];
char nam[4];
+ int which;
*melp = NULL;
- f = fopen("/var/run/mdadm/map", "r");
- if (!f)
- f = fopen("/var/run/mdadm.map", "r");
+ f = open_map(0, &which);
if (!f) {
RebuildMap();
- f = fopen("/var/run/mdadm/map", "r");
+ f = open_map(0, &which);
}
- if (!f)
- f = fopen("/var/run/mdadm.map", "r");
if (!f)
return;
while (fgets(buf, sizeof(buf), f)) {
- if (sscanf(buf, " md%1[p]%d %d.%d %x:%x:%x:%x %200s",
- nam, &devnum, &major, &minor, uuid, uuid+1,
- uuid+2, uuid+3, path) == 9) {
- if (nam[0] == 'p')
+ path[0] = 0;
+ if (sscanf(buf, " %3[mdp]%d %s %x:%x:%x:%x %200s",
+ nam, &devnum, metadata, uuid, uuid+1,
+ uuid+2, uuid+3, path) >= 7) {
+ if (strncmp(nam, "md", 2) != 0)
+ continue;
+ if (nam[2] == 'p')
devnum = -1 - devnum;
- map_add(melp, devnum, major, minor, uuid, path);
+ map_add(melp, devnum, metadata, uuid, path);
}
}
fclose(f);
}
}
-int map_update(struct map_ent **mpp, int devnum, int major, int minor,
+int map_update(struct map_ent **mpp, int devnum, char *metadata,
int *uuid, char *path)
{
struct map_ent *map, *mp;
for (mp = map ; mp ; mp=mp->next)
if (mp->devnum == devnum) {
- mp->major = major;
- mp->minor = minor;
+ strcpy(mp->metadata, metadata);
memcpy(mp->uuid, uuid, 16);
free(mp->path);
- mp->path = strdup(path);
+ mp->path = path ? strdup(path) : NULL;
break;
}
if (!mp)
- map_add(&map, devnum, major, minor, uuid, path);
- *mpp = NULL;
+ map_add(&map, devnum, metadata, uuid, path);
+ if (mpp)
+ *mpp = NULL;
rv = map_write(map);
map_free(map);
return rv;
if (!*map)
map_read(map);
- for (mp = *map ; mp ; mp = mp->next)
- if (memcmp(uuid, mp->uuid, 16) == 0)
- return mp;
+ for (mp = *map ; mp ; mp = mp->next) {
+ if (memcmp(uuid, mp->uuid, 16) != 0)
+ continue;
+ if (!mddev_busy(mp->devnum)) {
+ mp->bad = 1;
+ continue;
+ }
+ return mp;
+ }
return NULL;
+}
+
+struct map_ent *map_by_devnum(struct map_ent **map, int devnum)
+{
+ struct map_ent *mp;
+ if (!*map)
+ map_read(map);
+ for (mp = *map ; mp ; mp = mp->next) {
+ if (mp->devnum != devnum)
+ continue;
+ if (!mddev_busy(mp->devnum)) {
+ mp->bad = 1;
+ continue;
+ }
+ return mp;
+ }
+ return NULL;
+}
+
+struct map_ent *map_by_name(struct map_ent **map, char *name)
+{
+ struct map_ent *mp;
+ if (!*map)
+ map_read(map);
+
+ for (mp = *map ; mp ; mp = mp->next) {
+ if (!mp->path)
+ continue;
+ if (strncmp(mp->path, "/dev/md/", 8) != 0)
+ continue;
+ if (strcmp(mp->path+8, name) != 0)
+ continue;
+ if (!mddev_busy(mp->devnum)) {
+ mp->bad = 1;
+ continue;
+ }
+ return mp;
+ }
+ return NULL;
+}
+
+/* sets the proper subarray and container_dev according to the metadata
+ * version super_by_fd does this automatically, this routine is meant as
+ * a supplement for guess_super()
+ */
+static void set_member_info(struct supertype *st, struct mdstat_ent *ent)
+{
+ char version[strlen(ent->metadata_version)+1];
+
+ st->subarray[0] = '\0';
+
+ if (strncmp(ent->metadata_version, "external:", 9) != 0)
+ return;
+
+ strcpy(version, ent->metadata_version);
+
+ if (is_subarray(&version[9])) {
+ char *subarray = strrchr(version, '/');
+ char *name = &version[10];
+
+ if (!subarray)
+ return;
+ *subarray++ = '\0';
+
+ st->container_dev = devname2devnum(name);
+ strncpy(st->subarray, subarray, sizeof(st->subarray));
+ }
}
void RebuildMap(void)
struct mdstat_ent *md;
struct map_ent *map = NULL;
int mdp = get_mdp_major();
+ int require_homehost;
+ char sys_hostname[256];
+ char *homehost = conf_get_homehost(&require_homehost);
+
+ if (homehost == NULL || strcmp(homehost, "<system>")==0) {
+ if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
+ sys_hostname[sizeof(sys_hostname)-1] = 0;
+ homehost = sys_hostname;
+ }
+ }
for (md = mdstat ; md ; md = md->next) {
- struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
+ struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS|SKIP_GONE_DEVS);
struct mdinfo *sd;
+ if (!sra)
+ continue;
+
for (sd = sra->devs ; sd ; sd = sd->next) {
+ char namebuf[100];
char dn[30];
int dfd;
int ok;
st = guess_super(dfd);
if ( st == NULL)
ok = -1;
- else
+ else {
+ set_member_info(st, md);
ok = st->ss->load_super(st, dfd, NULL);
+ }
close(dfd);
if (ok != 0)
continue;
st->ss->getinfo_super(st, &info);
- if (md->devnum > 0)
+ if (md->devnum >= 0)
path = map_dev(MD_MAJOR, md->devnum, 0);
else
path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
- map_add(&map, md->devnum, st->ss->major,
- st->minor_version,
- info.uuid, path ? : "/unknown");
+ if (path == NULL ||
+ strncmp(path, "/dev/md/", 8) != 0) {
+ /* We would really like a name that provides
+ * an MD_DEVNAME for udev.
+ * The name needs to be unique both in /dev/md/
+ * and in this mapfile.
+ * It needs to match watch -I or -As would come
+ * up with.
+ * That means:
+ * Check if array is in mdadm.conf
+ * - if so use that.
+ * determine trustworthy from homehost etc
+ * find a unique name based on metadata name.
+ *
+ */
+ struct mddev_ident_s *match = conf_match(&info, st);
+ struct stat stb;
+ if (match && match->devname && match->devname[0] == '/') {
+ path = match->devname;
+ if (path[0] != '/') {
+ strcpy(namebuf, "/dev/md/");
+ strcat(namebuf, path);
+ path = namebuf;
+ }
+ } else {
+ int unum = 0;
+ char *sep = "_";
+ const char *name;
+ int conflict = 1;
+ if ((homehost == NULL ||
+ st->ss->match_home(st, homehost) != 1) &&
+ st->ss->match_home(st, "any") != 1 &&
+ (require_homehost
+ || ! conf_name_is_free(info.name)))
+ /* require a numeric suffix */
+ unum = 0;
+ else
+ /* allow name to be used as-is if no conflict */
+ unum = -1;
+ name = info.name;
+ if (!*name) {
+ name = st->ss->name;
+ if (!isdigit(name[strlen(name)-1]) &&
+ unum == -1) {
+ unum = 0;
+ sep = "";
+ }
+ }
+ if (strchr(name, ':'))
+ /* probably a uniquifying
+ * hostname prefix. Allow
+ * without a suffix
+ */
+ unum = -1;
+
+ while (conflict) {
+ if (unum >= 0)
+ sprintf(namebuf, "/dev/md/%s%s%d",
+ name, sep, unum);
+ else
+ sprintf(namebuf, "/dev/md/%s",
+ name);
+ unum++;
+ if (lstat(namebuf, &stb) != 0 &&
+ (map == NULL ||
+ !map_by_name(&map, namebuf+8)))
+ conflict = 0;
+ }
+ path = namebuf;
+ }
+ }
+ map_add(&map, md->devnum,
+ info.text_version,
+ info.uuid, path);
st->ss->free_super(st);
break;
}
+ sysfs_free(sra);
}
map_write(map);
map_free(map);
+ for (md = mdstat ; md ; md = md->next) {
+ struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_VERSION);
+ sysfs_uevent(sra, "change");
+ sysfs_free(sra);
+ }
+ free_mdstat(mdstat);
}
projects / thirdparty / mdadm.git / blobdiff