>From d4a187747316328858f7e7937fd37bbd250e611d Mon Sep 17 00:00:00 2001
From: Anna Czarnowska <anna.czarnowska@xxxxxxxxx>
Date: Fri, 23 Jul 2010 23:22:57 +0200
Subject: [PATCH 28/35] Monitor: added spare sharing and dev suitable functions
Main function searching for degraded arrays and moving
spares from other arrays in the same domain.
Dev_suitable checks disk status and size to decide if disk could
be used for rebuild in degraded array.
Signed-off-by: Anna Czarnowska <anna.czarnowska@xxxxxxxxx>
---
Monitor.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 102 insertions(+), 0 deletions(-)
diff --git a/Monitor.c b/Monitor.c
index 6a203c3..4c13095 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -48,6 +48,7 @@ struct state {
int devstate[MaxDisks];
int devid[MaxDisks];
int percent;
+ unsigned long long min_size;
char *metadata_version;
struct state *volumes; /* for a container it is a link its all volumes */
struct state *parent; /* for volumes it is a link to its container */
@@ -651,6 +652,16 @@ int move_spare(struct state *st2, struct state *st1, int i,
return 0;
}
+int dev_suitable(int i, struct state *st, unsigned long long size)
+{
+ unsigned long long ssize;
+ /* check if device not used in volumes, not failed, and big enough */
+ if (st->devid[i] > 0 && st->devstate[i] == 0 &&
+ (dev_size_from_id(st->devid[i], &ssize) && ssize >= size))
+ return 1;
+ return 0;
+}
+
/* get states of all disks in each container from metadata*/
int getinfo_containers(struct state *statelist)
{
@@ -705,6 +716,97 @@ cleanup:
return 1;
}
+/* If an array has active < raid && spare == 0
+ * Look for another array/container with unused, unfailed spare
+ * and the same domain and subset
+ * if found, hotremove/hotadd the spare (to parent container in external)
+ */
+void spare_sharing(struct state *statelist, char *mailaddr,
+ char *mailfrom, char *alert_cmd, int dosyslog)
+{
+ struct state *st, *stp, *vol, *st2 = NULL;
+ struct domain_ent *domain, *spare_domain;
+ struct subset *subset, *spare_subset;
+ int i, ext, found;
+
+ if (!getinfo_containers(statelist))
+ return;
+ for (st = statelist; st; st = st->next) {
+ if (st->err || st->active == st->raid || st->spare > 0)
+ continue;
+
+ found = 0;
+ ext = is_external(st->metadata_version);
+ /*
+ * for exernal metadata spare will be moved to parent container
+ */
+ if (ext) {
+ stp = st->parent;
+ if (!stp)
+ continue;
+ } else {
+ stp = st;
+ }
+ for (i = 0; i < stp->total; i++)
+ if (dev_suitable(i, stp, st->min_size))
+ break;
+ if (i < stp->total)
+ /* there is a spare in array/parent container,
+ * it was probably just added
+ * but mdmon has not started recovery yet
+ * we will not add any more spares for now */
+ continue;
+ if (!get_array_domain_and_subset(stp, &domain, &subset))
+ continue;
+
+ /* search for an array/container with unused spare */
+ for (st2 = statelist; st2; st2 = st2->next) {
+ if (st2->err || st2 == stp)
+ continue;
+ if ((ext && st2->parent != NULL) ||
+ (strcmp(stp->metadata_version, st2->metadata_version)
+ != 0))
+ continue;
+ if (ext) {
+ /* if container has degraded volume
+ * we can't remove spares */
+ for (vol = st2->volumes; vol; vol = vol->volumes)
+ if (vol->active < vol->raid)
+ break;
+ if (vol)
+ continue;
+ } else {
+ if (st2->active < st2->raid)
+ continue;
+ }
+ if (!get_array_domain_and_subset(st2, &spare_domain,
+ &spare_subset))
+ continue;
+ if ((domain != spare_domain) ||
+ (subset != spare_subset)) {
+ /* no point looking
+ * in that array/container */
+ continue;
+ } else {
+ for (i = 0; i < st2->total; i++) {
+ if (!dev_suitable(i, st2, st->min_size))
+ continue;
+ if (move_spare(st2, stp, i, mailaddr,
+ mailfrom, alert_cmd,
+ dosyslog)) {
+ found = 1;
+ /* stop searching disks */
+ break;
+ }
+ }
+ }
+ if (found)
+ break; /* stop searching arrays */
+ }
+ }
+ return;
+}
+
static void alert(char *event, char *dev, char *disc, char *mailaddr, char *mailfrom, char *cmd,
int dosyslog)
{
--
1.6.4.2
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