loop device not matching file size

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I have a sparse backing file (made via dd seek=) that's a partial image of a damaged disk. The size as given by ls matches the original disk. However, when looping it, /proc/partitions shows it as about have the size as the original disk. It seems like losetup is ignoring the final sparse extend of the file because it has no data following it.



As a result, if I use losetup -P (or kpartx) the partitioning fails on a partition extending past the size given by /proc/partitions.



How can I resolve this without expanding the file? (Perhaps writing to the last sector will help, but I would like to avoid touching the image).






partition dd loop-device disk-image sparse-files







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    I have a sparse backing file (made via dd seek=) that's a partial image of a damaged disk. The size as given by ls matches the original disk. However, when looping it, /proc/partitions shows it as about have the size as the original disk. It seems like losetup is ignoring the final sparse extend of the file because it has no data following it.



    As a result, if I use losetup -P (or kpartx) the partitioning fails on a partition extending past the size given by /proc/partitions.



    How can I resolve this without expanding the file? (Perhaps writing to the last sector will help, but I would like to avoid touching the image).






    partition dd loop-device disk-image sparse-files







    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a sparse backing file (made via dd seek=) that's a partial image of a damaged disk. The size as given by ls matches the original disk. However, when looping it, /proc/partitions shows it as about have the size as the original disk. It seems like losetup is ignoring the final sparse extend of the file because it has no data following it.



      As a result, if I use losetup -P (or kpartx) the partitioning fails on a partition extending past the size given by /proc/partitions.



      How can I resolve this without expanding the file? (Perhaps writing to the last sector will help, but I would like to avoid touching the image).






      partition dd loop-device disk-image sparse-files







      share|improve this question













      I have a sparse backing file (made via dd seek=) that's a partial image of a damaged disk. The size as given by ls matches the original disk. However, when looping it, /proc/partitions shows it as about have the size as the original disk. It seems like losetup is ignoring the final sparse extend of the file because it has no data following it.



      As a result, if I use losetup -P (or kpartx) the partitioning fails on a partition extending past the size given by /proc/partitions.



      How can I resolve this without expanding the file? (Perhaps writing to the last sector will help, but I would like to avoid touching the image).






      partition dd loop-device disk-image sparse-files




      partition dd loop-device disk-image sparse-files






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      share|improve this question










      asked 17 mins ago









      afuna

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