[Bug 717105] Re: file system larger than partition in pre-built omap4 image

[Mathieu Trudel-Lapierre]

** Changed in: debian-cd (Ubuntu)
       Status: New => Triaged

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Title:
  file system larger than partition in pre-built omap4 image

Status in debian-cd package in Ubuntu:
  Triaged
Status in partman-auto package in Ubuntu:
  Invalid

Bug description:
  Hi,

  I was looking at a recent, pre-built Pandaboard image
  <http://cdimage.ubuntu.com/ubuntu-netbook/daily-preinstalled/current
  /natty-preinstalled-netbook-armel+omap4.img.gz>  (retrieved on 11 Feb
  2011).

  It has two partitions that don't quite fill the image file:

  # gunzip natty-preinstalled-netbook-armel+omap4.img.gz
  # sfdisk -uS -l natty-preinstalled-netbook-armel+omap4.img
  Disk natty-preinstalled-netbook-armel+omap4.img: cannot get geometry

  Disk natty-preinstalled-netbook-armel+omap4.img: 247 cylinders, 255 heads, 63 sectors/track
  Units = sectors of 512 bytes, counting from 0

     Device Boot    Start       End   #sectors  Id  System
  natty-preinstalled-netbook-armel+omap4.img1   *        63    144584     144522   c  W95 FAT32 (LBA)
  natty-preinstalled-netbook-armel+omap4.img2        144585   3968054    3823470  83  Linux
  natty-preinstalled-netbook-armel+omap4.img3             0         -          0   0  Empty
  natty-preinstalled-netbook-armel+omap4.img4             0         -          0   0  Empty
  # echo $((3823470 * 512))
  1957616640

  The second partition size is 3823470 sectors (1957616640 bytes), but
  it contains a ext3 filesystem that is larger than the partition
  (479269*4096 = 1963085824 bytes):

  # losetup --show --find --offset $((144585*512))  --sizelimit $((3823470*512)) natty-preinstalled-netbook-armel+omap4.img 
  /dev/loop0

  # e2fsck /dev/loop0
  e2fsck 1.41.12 (17-May-2010)
  The filesystem size (according to the superblock) is 479269 blocks
  The physical size of the device is 477933 blocks
  Either the superblock or the partition table is likely to be corrupt!
  Abort<y>? y
  yes
  # tune2fs -l /dev/loop0
  ...
  Block count:              479269
  ...
  Block size:               4096
  ...
  # echo $((479269 * 4096))
  1963085824

  
  Is this the right place to file a bug report about this?

  [
  Fortunately the filesystem does end before the end of the image file:
  # ls -l natty-preinstalled-netbook-armel+omap4.img
  -rw-r--r-- 1 xxxxxxxx xxxxxxxx 2038583296 2011-02-11 12:44 natty-preinstalled-netbook-armel+omap4.img
  # echo $((144585*512 + 1963085824))
  2037113344

  And e2fsck is happy if I leave out the --sizelimit.  But the --sizelimit is valid.
  ]

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