Assemble: allow to assemble spares on their own

[thirdparty/mdadm.git] / Assemble.c

diff --git a/Assemble.c b/Assemble.c
index 7ef9dc3e50b99be2d537d403d18d618a9b564d96..532335e7779acb50053b152da2942960a8de0caf 100644 (file)
--- 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