/*
- * mapfile - manage /var/run/mdadm.map. Part of:
+ * mapfile - keep track of uuid <-> array mapping. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2006-2010 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* Australia
*/
-/* /var/run/mdadm.map is used to track arrays being created in --incremental
- * more. It particularly allows lookup from UUID to array device, but
+/* The mapfile is used to track arrays being created in --incremental
+ * mode. It particularly allows lookup from UUID to array device, but
* also allows the array device name to be easily found.
*
* The map file is line based with space separated fields. The fields are:
* UUID - uuid of the array
* path - path where device created: /dev/md/home
*
+ * The best place for the mapfile wold be /var/run/mdadm/map. However
+ * it is needed during initramfs early-boot, and /var/run doesn't exist there
+ * and certainly doesn't persist through to normal boot.
+ * So we store it in /dev/.mdadm/map but allow this to be changed at
+ * compile time. via MAP_DIR and MAP_FILE
+ *
*/
-
-
-#include "mdadm.h"
-
+#include "mdadm.h"
+#include <sys/file.h>
+#include <ctype.h>
+
+#ifndef MAP_DIR
+#define MAP_DIR "/dev/.mdadm"
+#define MAP_FILE "map"
+#endif
+
+#define MAP_READ 0
+#define MAP_NEW 1
+#define MAP_LOCK 2
+#define MAP_DIRNAME 3
+#define mapnames(dir, base) { \
+
+char *mapname[4] = {
+ MAP_DIR "/" MAP_FILE,
+ MAP_DIR "/" MAP_FILE ".new",
+ MAP_DIR "/" MAP_FILE ".lock",
+ MAP_DIR
+};
+
+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 fd;
+ if ((mapmode[modenum] & O_CREAT))
+ /* Attempt to create directory, don't worry about
+ * failure.
+ */
+ (void)mkdir(mapname[MAP_DIRNAME], 0755);
+ fd = open(mapname[modenum], mapmode[modenum], 0600);
+ if (fd >= 0)
+ return fdopen(fd, mapsmode[modenum]);
+ return NULL;
+}
int map_write(struct map_ent *mel)
{
FILE *f;
int err;
- int subdir = 1;
- f = fopen("/var/run/mdadm/map.new", "w");
- if (!f) {
- f = fopen("/var/run/mdadm.map.new", "w");
- subdir = 0;
- }
+ f = open_map(MAP_NEW);
+
if (!f)
return 0;
for (; mel; mel = mel->next) {
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);
+ 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[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[1],
+ mapname[0]) == 0;
}
-static int lfd = -1;
-static int lsubdir = 0;
+static FILE *lf = NULL;
int map_lock(struct map_ent **melp)
{
- if (lfd < 0) {
- lfd = open("/var/run/mdadm/map.lock", O_CREAT|O_RDWR, 0600);
- if (lfd < 0) {
- lfd = open("/var/run/mdadm.map.lock", O_CREAT|O_RDWR, 0600);
- lsubdir = 0;
- } else
- lsubdir = 1;
- if (lfd < 0)
+ while (lf == NULL) {
+ struct stat buf;
+ lf = open_map(MAP_LOCK);
+ if (lf == NULL)
return -1;
- if (lockf(lfd, F_LOCK, 0) != 0) {
- close(lfd);
- lfd = -1;
+ if (flock(fileno(lf), LOCK_EX) != 0) {
+ fclose(lf);
+ lf = NULL;
return -1;
}
+ if (fstat(fileno(lf), &buf) != 0 ||
+ buf.st_nlink == 0) {
+ /* The owner of the lock unlinked it,
+ * so we have a lock on a stale file,
+ * try again
+ */
+ fclose(lf);
+ lf = NULL;
+ }
}
if (*melp)
map_free(*melp);
void map_unlock(struct map_ent **melp)
{
- if (lfd >= 0)
- close(lfd);
- if (lsubdir)
- unlink("/var/run/mdadm/map.lock");
- else
- unlink("/var/run/mdadm.map.lock");
- lfd = -1;
+ if (lf) {
+ /* must unlink before closing the file,
+ * as only the owner of the lock may
+ * unlink the file
+ */
+ unlink(mapname[2]);
+ fclose(lf);
+ }
+ lf = NULL;
}
void map_add(struct map_ent **melp,
me->devnum = devnum;
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;
*melp = NULL;
- f = fopen("/var/run/mdadm/map", "r");
- if (!f)
- f = fopen("/var/run/mdadm.map", "r");
+ f = open_map(MAP_READ);
if (!f) {
RebuildMap();
- f = fopen("/var/run/mdadm/map", "r");
+ f = open_map(MAP_READ);
}
- if (!f)
- f = fopen("/var/run/mdadm.map", "r");
if (!f)
return;
while (fgets(buf, sizeof(buf), f)) {
+ 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) == 8) {
+ uuid+2, uuid+3, path) >= 7) {
if (strncmp(nam, "md", 2) != 0)
continue;
if (nam[2] == 'p')
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)
}
}
+void map_remove(struct map_ent **mapp, int devnum)
+{
+ if (devnum == NoMdDev)
+ return;
+
+ map_delete(mapp, devnum);
+ map_write(*mapp);
+ map_free(*mapp);
+}
+
struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
{
struct map_ent *mp;
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)
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 char *get_member_info(struct mdstat_ent *ent)
+{
+
+ if (ent->metadata_version == NULL ||
+ strncmp(ent->metadata_version, "external:", 9) != 0)
+ return NULL;
+
+ if (is_subarray(&ent->metadata_version[9])) {
+ char *subarray;
+
+ subarray = strrchr(ent->metadata_version, '/');
+ return subarray + 1;
+ }
+ return NULL;
+}
+
void RebuildMap(void)
{
struct mdstat_ent *mdstat = mdstat_read(0, 0);
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 *sd;
+ if (!sra)
+ continue;
+
for (sd = sra->devs ; sd ; sd = sd->next) {
+ char namebuf[100];
char dn[30];
int dfd;
int ok;
struct supertype *st;
+ char *subarray;
char *path;
- struct mdinfo info;
+ struct mdinfo *info;
sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
dfd = dev_open(dn, O_RDONLY);
st = guess_super(dfd);
if ( st == NULL)
ok = -1;
- else
+ else {
+ subarray = get_member_info(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)
+ info = st->ss->container_content(st, subarray);
+
+ if (md->devnum >= 0)
path = map_dev(MD_MAJOR, md->devnum, 0);
else
path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
+ 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 *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 ? : "/unknown");
+ info->text_version,
+ info->uuid, path);
st->ss->free_super(st);
+ free(info);
break;
}
sysfs_free(sra);
}
- map_write(map);
+ /* Only trigger a change if we wrote a new map file */
+ if (map_write(map))
+ for (md = mdstat ; md ; md = md->next) {
+ struct mdinfo *sra = sysfs_read(-1, md->devnum,
+ GET_VERSION);
+ if (sra)
+ sysfs_uevent(sra, "change");
+ sysfs_free(sra);
+ }
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