* mdstat - parse /proc/mdstat file. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (C) 2002-2006 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* read_ahead {not set|%d sectors}
* mdN : {in}active {(readonly)} raidX dev[%d]{(F)} ... %d blocks STATUS RESYNC
* ... Only initialised arrays listed
- * unused: dev dev dev | <none>
+ * unused devices: {dev dev ... | <none>}
*
* STATUS is personality dependant:
* linear: %dk rounding
* mdN : {in}active {(read-only)} raidX dev[%d]{(F)} ...
* %d blocks STATUS
* RESYNC
- * unused: dev dev .. | <none>
+ * unused devices: {dev dev .. | <none>}
*
* STATUS matches 0.90.0/2.2
* RESYNC includes [===>....],
}
static int mdstat_fd = -1;
-struct mdstat_ent *mdstat_read(int hold)
+struct mdstat_ent *mdstat_read(int hold, int start)
{
FILE *f;
- struct mdstat_ent *all, **end;
+ struct mdstat_ent *all, *rv, **end, **insert_here;
char *line;
if (hold && mdstat_fd != -1) {
f = fopen("/proc/mdstat", "r");
if (f == NULL)
return NULL;
+ else
+ fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
all = NULL;
end = &all;
struct mdstat_ent *ent;
char *w;
int devnum;
+ int in_devs = 0;
char *ep;
if (strcmp(line, "Personalities")==0)
continue;
if (strcmp(line, "unused")==0)
continue;
+ insert_here = NULL;
/* Better be an md line.. */
if (strncmp(line, "md", 2)!= 0)
continue;
ent->dev = strdup(line);
ent->devnum = devnum;
-
+
for (w=dl_next(line); w!= line ; w=dl_next(w)) {
int l = strlen(w);
char *eq;
ent->active = 0;
else if (ent->active >=0 &&
ent->level == NULL &&
- w[0] != '(' /*readonly*/)
+ w[0] != '(' /*readonly*/) {
ent->level = strdup(w);
- else if (!ent->pattern &&
+ in_devs = 1;
+ } else if (in_devs && strcmp(w, "blocks")==0)
+ in_devs = 0;
+ else if (in_devs && strncmp(w, "md", 2)==0) {
+ /* This has an md device as a component.
+ * If that device is already in the list,
+ * make sure we insert before there.
+ */
+ struct mdstat_ent **ih;
+ int dn2;
+ if (strncmp(w, "md_d", 4)==0)
+ dn2 = -1-strtoul(w+4, &ep, 10);
+ else
+ dn2 = strtoul(w+2, &ep, 10);
+ ih = &all;
+ while (ih != insert_here && *ih &&
+ (*ih)->devnum != dn2)
+ ih = & (*ih)->next;
+ insert_here = ih;
+ } else if (!ent->pattern &&
w[0] == '[' &&
(w[1] == 'U' || w[1] == '_')) {
ent->pattern = strdup(w+1);
strncmp(w, "resync", 4)==0) {
ent->resync = 1;
} else if (ent->percent == -1 &&
- w[0] >= '0' &&
+ w[0] >= '0' &&
w[0] <= '9' &&
w[l-1] == '%') {
ent->percent = atoi(w);
}
}
- *end = ent;
- end = &ent->next;
+ if (insert_here && (*insert_here)) {
+ ent->next = *insert_here;
+ *insert_here = ent;
+ } else {
+ *end = ent;
+ end = &ent->next;
+ }
}
- if (hold && mdstat_fd == -1)
+ if (hold && mdstat_fd == -1) {
mdstat_fd = dup(fileno(f));
+ fcntl(mdstat_fd, F_SETFD, FD_CLOEXEC);
+ }
fclose(f);
- return all;
+
+ /* If we might want to start array,
+ * reverse the order, so that components comes before composites
+ */
+ if (start) {
+ rv = NULL;
+ while (all) {
+ struct mdstat_ent *e = all;
+ all = all->next;
+ e->next = rv;
+ rv = e;
+ }
+ } else rv = all;
+ return rv;
}
void mdstat_wait(int seconds)
tm.tv_usec = 0;
select(mdstat_fd >2 ? mdstat_fd+1:3, NULL, NULL, &fds, &tm);
}
+
+int mddev_busy(int devnum)
+{
+ struct mdstat_ent *mdstat = mdstat_read(0, 0);
+ struct mdstat_ent *me;
+
+ for (me = mdstat ; me ; me = me->next)
+ if (me->devnum == devnum)
+ break;
+ free_mdstat(mdstat);
+ return me != NULL;
+}