/*
- * mapfile - manage /var/run/mdadm.map. Part of:
+ * mapfile - manage /var/run/mdadm/map. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
* 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
+/* /var/run/mdadm/map 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 preferred location for the map file is /var/run/mdadm.map.
+ * 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.
+ * /var/run/mdadm/map /dev/.mdadm/map(changable at compile time).
* We read from the first one that exists and write to the first
* one that we can.
*/
#include "mdadm.h"
+#include <sys/file.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)
+#define MAP_READ 0
+#define MAP_NEW 1
+#define MAP_LOCK 2
+#define MAP_DIRNAME 3
+#define mapnames(dir, base) { \
+ dir "/" base, \
+ dir "/" base ".new", \
+ dir "/" base ".lock", \
+ dir }
+
+#define MAP_DIRS 2
+char *mapname[MAP_DIRS][4] = {
+ mapnames("/var/run/mdadm", "map"),
+ mapnames(MAP_DIR, MAP_FILE),
};
-int mapmode[3] = { O_RDONLY, O_RDWR|O_CREAT, O_RDWR|O_CREAT | O_TRUNC };
+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);
+
+ for (i = 0 ; i <= MAP_DIRS ; i++) {
+ int fd;
+ if ((mapmode[modenum] & O_CREAT))
+ /* Attempt to create directory, don't worry about
+ * failure.
+ */
+ (void)mkdir(mapname[i][MAP_DIRNAME], 0755);
+ fd = open(mapname[i][modenum], mapmode[modenum], 0600);
if (fd >= 0) {
*choice = i;
return fdopen(fd, mapsmode[modenum]);
int err;
int which;
- f = open_map(1, &which);
+ f = open_map(MAP_NEW, &which);
if (!f)
return 0;
static int lwhich = 0;
int map_lock(struct map_ent **melp)
{
- if (lf == NULL) {
- lf = open_map(2, &lwhich);
+ while (lf == NULL) {
+ struct stat buf;
+ lf = open_map(MAP_LOCK, &lwhich);
if (lf == NULL)
return -1;
- if (lockf(fileno(lf), F_LOCK, 0) != 0) {
+ 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 (lf)
+ if (lf) {
+ /* must unlink before closing the file,
+ * as only the owner of the lock may
+ * unlink the file
+ */
+ unlink(mapname[lwhich][2]);
fclose(lf);
- unlink(mapname[lwhich][2]);
+ }
lf = NULL;
}
*melp = NULL;
- f = open_map(0, &which);
+ f = open_map(MAP_READ, &which);
if (!f) {
RebuildMap();
- f = open_map(0, &which);
+ f = open_map(MAP_READ, &which);
}
if (!f)
return;
}
}
+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;
}
for (md = mdstat ; md ; md = md->next) {
- struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS|SKIP_GONE_DEVS);
+ struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
struct mdinfo *sd;
if (!sra)
}
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