[issue1622] devfs doesn't create my ad4s3 (macbook)

[Alex Hornung (via DragonFly issue tracker)]

Alex Hornung <ahornung at gmail.com> added the comment:

It seems gpt starts numbering slices at 0, so the usual ad4s1 is ad4s0, ... 
leading to the fact that the expected ad4s3 is at ad4s2.

In any case, I'll update our GPT code to fix some other issues (for example 
the slice type is always set to 1).


For reference:
7:46:26 dragon:~ 
# gpt show /dev/ad0
    start     size  index  contents
        0        1      -  PMBR
        1        1      -  Pri GPT header
        2       32      -  Pri GPT table
       34        6      -  
       40   409600      0  GPT part - EFI System
   409640   293391      1  GPT part - Apple HFS
   703031   400000      -  
  1103031   185671      2  GPT part - MS/Linux Basic Data
  1288702   808417      -  
  2097119       32      -  Sec GPT table
  2097151        1      -  Sec GPT header
                                                          
7:47:05 dragon:~ 
# newfs_msdos /dev/ad0s2 
/dev/ad0s2: 185276 sectors in 46319 FAT16 clusters (2048 bytes/cluster)
bps=512 spc=4 res=1 nft=2 rde=512 mid=0xf8 spf=181 spt=63 hds=256 hid=1103031 
bsec=185671

Observe carefully that the bsec of the newfs actually matches the number of 
sectors of the third partition, with gpt index 2.


Cheers,
Alex Hornung

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