Assemble: allow to assemble spares on their own

If we find spares but no members of given array
we create container with just spares.

This allows auto assemble to pick up all lose imsm spares when there
is no config file.
When there is a valid config file and any array is assembled from it
we don't try auto assembly so we will not assemble spares that don't
match any array.
To remedy this we must add
ARRAY metadata=imsm UUID=00000000:00000000:00000000:00000000
to config file.
This container will include all remaining spares.

Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 34 insertions, 7 deletions

diff --git a/Assemble.c b/Assemble.c
index 7ef9dc3e..532335e7 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -489,17 +489,23 @@ int Assemble(struct supertype *st, char *mddev,
 					   homehost, update,
 					   report_missmatch ? devname : NULL))
 				goto loop;
-
-			if (!memcmp(content->uuid, uuid_zero, sizeof(int[4]))) {
-				/* this is imsm_spare - do not set st */
-				tmpdev->used = 3;
-				goto loop;
-			}
 				
 			if (st == NULL)
 				st = dup_super(tst);
 			if (st->minor_version == -1)
 				st->minor_version = tst->minor_version;
+
+			if (memcmp(content->uuid, uuid_zero,
+				   sizeof(int[4])) == 0) {
+				/* this is a floating spare.  It cannot define
+				 * an array unless there are no more arrays of
+				 * this type to be found.  It can be included
+				 * in an array of this type though.
+				 */
+				tmpdev->used = 3;
+				goto loop;
+			}
+
 			if (st->ss != tst->ss ||
 			    st->minor_version != tst->minor_version ||
 			    st->ss->compare_super(st, tst) != 0) {
@@ -557,6 +563,25 @@ int Assemble(struct supertype *st, char *mddev,
 			tst->ss->free_super(tst);
 	}
 
+	/* Check if we found some imsm spares but no members */
+	if (auto_assem && (!st || !st->sb))
+		for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
+			if (tmpdev->used != 3)
+				continue;
+			tmpdev->used = 1;
+			content = &info;
+
+			if (!st->sb) {
+				/* we need sb from one of the spares */
+				int dfd = dev_open(tmpdev->devname, O_RDONLY);
+				if (dfd < 0 ||
+				    st->ss->load_super(st, dfd, NULL))
+					tmpdev->used = 2;
+				if (dfd > 0)
+					close(dfd);
+			}
+		}
+
 	/* Now reject spares that don't match domains of identified members */
 	for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
 		struct stat stb;
@@ -892,8 +917,10 @@ int Assemble(struct supertype *st, char *mddev,
 		if (content->array.level != LEVEL_MULTIPATH)
 			if (!(devices[j].i.disk.state & (1<<MD_DISK_ACTIVE))) {
 				if (!(devices[j].i.disk.state
-				      & (1<<MD_DISK_FAULTY)))
+				      & (1<<MD_DISK_FAULTY))) {
+					devices[j].uptodate = 1;
 					sparecnt++;
+				}
 				continue;
 			}
 		/* If this devices thinks that 'most_recent' has failed, then