Re: Are BSD partitions not supported?

[Vladimir 'φ-coder/phcoder' Serbinenko]

C. P. Ghost wrote:
> On Wed, May 19, 2010 at 12:06 AM, C. P. Ghost <address@hidden> wrote:
>   
>> 2010/5/18 Vladimir 'φ-coder/phcoder' Serbinenko <address@hidden>:
>>     
>>> This bsdlabel has 2 strangenesses. First one is seen in your log:
>>>
>>>  a:   497936       16    unused        0     0
>>> In other words for some strange reason it's declared as unused entry slot.
>>>       
>> Ah, you're right! My mistake. I'll edit the type to "4.2BSD"
>> and will try again.
>>     
>
> Okay, first with the original non-patched 1.98 grub2 version,
> after setting the type to 4.2BSD in bsdlabel:
>
> phenom# bsdlabel /dev/md5555s1
> # /dev/md5555s1:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>   a:    48116       16    4.2BSD        0     0     0
>   c:    48132        0    unused        0     0         # "raw" part, don't 
> edit
>
> phenom# newfs /dev/md5555s1a
> /dev/md5555s1a: 23.5MB (48116 sectors) block size 16384, fragment size 2048
>         using 4 cylinder groups of 5.88MB, 376 blks, 768 inodes.
> super-block backups (for fsck -b #) at:
>  160, 12192, 24224, 36256
>
> phenom# mount /dev/md5555s1a /mnt
>
> phenom# grub-install --root-directory=/mnt --modules=ufs2 /dev/md5555
> /usr/local/sbin/grub-probe: error: unknown filesystem.
> Installation finished. No error reported.
>
> This copies /boot/grub/* to /mnt as before. Now, if I run qemu, I get
> dropped into grub-rescue:
>
> % qemu -hda bsddisk.img
> GRUB loading.
> Welcome to GRUB!
>
> error: unknown filesystem.
> Entering rescue mode...
> grub rescue> _
>
> grub rescue> insmod part_msdos
> grub rescue> insmod part_bsd
> error: unknown filesystem.
>
> Unfortunately, the patch doesn't apply cleanly (against the
> bzr version):
>
> % patch -p0 < ../../patch-002
> Hmm...  Looks like a unified diff to me...
> The text leading up to this was:
> --------------------------
> |--- partmap/bsdlabel.c    2010-03-26 14:44:13 +0000
> |+++ partmap/bsdlabel.c    2010-05-18 22:13:37 +0000
> --------------------------
> Patching file partmap/bsdlabel.c using Plan A...
> Hunk #1 succeeded at 37 with fuzz 1.
> Hunk #2 succeeded at 46.
> Hunk #3 failed at 86.
> 1 out of 3 hunks failed--saving rejects to partmap/bsdlabel.c.rej
> Hmm...  Ignoring the trailing garbage.
> done
>
> % cat partmap/bsdlabel.c.rej
> ***************
> *** 68,78 ****
>         p.len = grub_le_to_cpu32 (be.size);
>         p.partmap = &grub_bsdlabel_partition_map;
>
> -       if (be.fs_type != GRUB_PC_PARTITION_BSD_TYPE_UNUSED)
>       if (hook (disk, &p))
>         return grub_errno;
> -
> -       pos += sizeof (struct grub_partition_bsd_entry);
>       }
>
>     return GRUB_ERR_NONE;
> --- 86,94 ----
>         p.len = grub_le_to_cpu32 (be.size);
>         p.partmap = &grub_bsdlabel_partition_map;
>
> +       if (p.len != 0)
>       if (hook (disk, &p))
>         return grub_errno;
>       }
>
>     return GRUB_ERR_NONE;
>
> Any idea?
>
>   
Mailer. Now I attach it
> Thanks,
> -cpghost.
>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

=== modified file 'include/grub/bsdlabel.h'
--- include/grub/bsdlabel.h     2010-02-06 17:43:37 +0000
+++ include/grub/bsdlabel.h     2010-05-18 22:05:09 +0000
@@ -63,6 +63,8 @@
 #define        GRUB_PC_PARTITION_OPENBSD_TYPE_NTFS     18
 #define        GRUB_PC_PARTITION_OPENBSD_TYPE_RAID     19
 
+#define GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION 2
+
 /* The BSD partition entry.  */
 struct grub_partition_bsd_entry
 {

=== modified file 'partmap/bsdlabel.c'
--- partmap/bsdlabel.c  2010-03-26 14:44:13 +0000
+++ partmap/bsdlabel.c  2010-05-18 22:13:37 +0000
@@ -37,9 +37,6 @@
   grub_disk_addr_t delta = 0;
   unsigned pos;
 
-  /* BSDLabel offsets are absolute even when it's embed inside partition.  */
-  delta = grub_partition_get_start (disk->partition);
-
   /* Read the BSD label.  */
   if (grub_disk_read (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR,
                      0, sizeof (label), &label))
@@ -49,15 +46,36 @@
   if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC))
     return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
 
+  /* A kludge to determine a base of be.offset.  */
+  if (GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION
+      < grub_cpu_to_le16 (label.num_partitions))
+    {
+      struct grub_partition_bsd_entry whole_disk_be;
+
+      pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR
+       * GRUB_DISK_SECTOR_SIZE + sizeof (struct grub_partition_bsd_entry)
+       * GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION;
+
+      if (grub_disk_read (disk, pos / GRUB_DISK_SECTOR_SIZE,
+                         pos % GRUB_DISK_SECTOR_SIZE, sizeof (whole_disk_be),
+                         &whole_disk_be))
+       return grub_errno;
+
+      delta = grub_le_to_cpu32 (whole_disk_be.offset);
+    }
+
   pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR
     * GRUB_DISK_SECTOR_SIZE;
 
   for (p.number = 0;
        p.number < grub_cpu_to_le16 (label.num_partitions);
-       p.number++)
+       p.number++, pos += sizeof (struct grub_partition_bsd_entry))
     {
       struct grub_partition_bsd_entry be;
 
+      if (p.number == GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION)
+       continue;
+
       p.offset = pos / GRUB_DISK_SECTOR_SIZE;
       p.index = pos % GRUB_DISK_SECTOR_SIZE;
 
@@ -68,11 +86,9 @@
       p.len = grub_le_to_cpu32 (be.size);
       p.partmap = &grub_bsdlabel_partition_map;
 
-      if (be.fs_type != GRUB_PC_PARTITION_BSD_TYPE_UNUSED)
+      if (p.len != 0)
        if (hook (disk, &p))
          return grub_errno;
-
-      pos += sizeof (struct grub_partition_bsd_entry);
     }
 
   return GRUB_ERR_NONE;

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