Other Mount img file with several partitions

P

Peter2121

Hello,
I'm trying to mount an image file (raspbian SD card image).
Under Linux I should use -o option of mount to define the offset of the second partition (ext2fs). As I understand, under FreeBSD I should use mdconfig to create a device from img file and gnop to create a second device with the offset needed.
So I got the first device:
Code: 
# gpart list md0
Geom name: md0
modified: false
state: OK
fwheads: 128
fwsectors: 43
last: 3788799
first: 1
entries: 4
scheme: MBR
Providers:
1. Name: md0s1
  Mediasize: 58720256 (56M)
  Sectorsize: 512
  Stripesize: 0
  Stripeoffset: 4194304
  Mode: r0w0e0
  rawtype: 12
  length: 58720256
  offset: 4194304
  type: !12
  index: 1
  end: 122879
  start: 8192
2. Name: md0s2
  Mediasize: 1876951040 (1.7G)
  Sectorsize: 512
  Stripesize: 0
  Stripeoffset: 62914560
  Mode: r0w0e0
  rawtype: 131
  length: 1876951040
  offset: 62914560
  type: linux-data
  index: 2
  end: 3788799
  start: 122880
Consumers:
1. Name: md0
  Mediasize: 1939865600 (1.8G)
  Sectorsize: 512
  Mode: r0w0e0

And I created the second device:

Code: 
# gnop create -v -o 62914560 md0
Done.
# gnop list
Geom name: md0.nop
WroteBytes: 0
ReadBytes: 75264
Writes: 0
Reads: 24
Error: 5
WriteFailProb: 0
ReadFailProb: 0
Offset: 62914560
Providers:
1. Name: md0.nop
  Mediasize: 1876951040 (1.7G)
  Sectorsize: 512
  Mode: r0w0e0
Consumers:
1. Name: md0
  Mediasize: 1939865600 (1.8G)
  Sectorsize: 512
  Mode: r0w0e0

Now I would like to mount my device to a directory - and I can't:

Code: 
# mount -t ext2fs /dev/md0.nop /mnt/img
mount: /dev/md0.nop: Invalid argument
# gpart list md0.nop
gpart: No such geom: md0.nop.

The geom is here:

Code: 
# geom nop list
Geom name: md0.nop
WroteBytes: 0
ReadBytes: 75264
Writes: 0
Reads: 24
Error: 5
WriteFailProb: 0
ReadFailProb: 0
Offset: 62914560
Providers:
1. Name: md0.nop
  Mediasize: 1876951040 (1.7G)
  Sectorsize: 512
  Mode: r0w0e0
Consumers:
1. Name: md0
  Mediasize: 1939865600 (1.8G)
  Sectorsize: 512
  Mode: r0w0e0

I can even dd from it:

Code: 
# dd if=/dev/md0.nop of=/dev/null
3665920+0 records in
3665920+0 records out
1876951040 bytes transferred in 35.631983 secs (52676020 bytes/sec)

What did I miss? How can I access this filesystem?
 
Peter2121 said:
What did I miss?
Click to expand...
FreeBSD already detected your partitions. Look at the output of geom list md0. md0s2 begins at the offset 62914560 which is the same number you gave to gnop. What I am saying is that you don't need gnop here. Just use /dev/md0s2 as device for mounting. You might need to undo the gnop command first with gnop destroy md0.nop.
 
tobik,
Sure, I've tried already 'the simple way':
Code: 
# mount -t ext2fs /dev/md0s2 /mnt/img
mount: /dev/md0s2: Invalid argument
 
Code: 
# file -s /dev/md0s2
/dev/md0s2: Linux rev 1.0 ext4 filesystem data, UUID=62ba9ec9-47d9-4421-aaee-71dd6c0f3707 (extents) (large files)
It seems that the ext4 is my problem - I can access the slice in ro mode.
I'm really surprised that ext4 rw access is not available on FreeBSD in native mode, I'll try sysutils/fusefs-ext4fuse...

Update:
ext4fuse is readonly too... :(
No way?
 
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