Author: ae
Date: Mon Aug 13 13:33:21 2012
New Revision: 239232
URL: http://svn.freebsd.org/changeset/base/239232

Log:
  Restore the old behaviour. If requested partition is a BSD slice,
  but d_partition isn't explicitly set, then try to open BSD label and its
  first partition.

Modified:
  head/sys/boot/common/disk.c

Modified: head/sys/boot/common/disk.c
==============================================================================
--- head/sys/boot/common/disk.c Mon Aug 13 13:10:50 2012        (r239231)
+++ head/sys/boot/common/disk.c Mon Aug 13 13:33:21 2012        (r239232)
@@ -185,10 +185,18 @@ disk_open(struct disk_devdesc *dev, off_
                if (rc != 0) /* Partition doesn't exist */
                        goto out;
                dev->d_offset = part.start;
-               if (dev->d_partition == -1 ||
-                   dev->d_partition == 255)
+               if (dev->d_partition == 255)
                        goto out; /* Nothing more to do */
-
+               if (dev->d_partition == -1) {
+                       /*
+                        * If we are looking at a BSD slice, and the
+                        * partition is < 0, assume the 'a' partition.
+                        */
+                       if (part.type == PART_FREEBSD)
+                               dev->d_partition = 0;
+                       else
+                               goto out;
+               }
                /* Try to read BSD label */
                table = ptable_open(dev, part.end - part.start + 1,
                    od->sectorsize, ptblread);
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