btrfs snapshot and /dev/ptmx

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I have a btrfs root partition and I use snapper to automatically take snapshots.



The /dev/ptmx file change between each snapshots despite /dev is mounted as a devtmpfs file system.



I have tried creating a file in /dev, and as expected it is not snapshotted.



My first intuition was that one service was started before /dev is mounted as a devtmpfs and still using it, but sudo fuser /dev/ptmx show no use of that file.



Can someone explain this behavior?







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    up vote
    0
    down vote

    favorite












    I have a btrfs root partition and I use snapper to automatically take snapshots.



    The /dev/ptmx file change between each snapshots despite /dev is mounted as a devtmpfs file system.



    I have tried creating a file in /dev, and as expected it is not snapshotted.



    My first intuition was that one service was started before /dev is mounted as a devtmpfs and still using it, but sudo fuser /dev/ptmx show no use of that file.



    Can someone explain this behavior?







    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a btrfs root partition and I use snapper to automatically take snapshots.



      The /dev/ptmx file change between each snapshots despite /dev is mounted as a devtmpfs file system.



      I have tried creating a file in /dev, and as expected it is not snapshotted.



      My first intuition was that one service was started before /dev is mounted as a devtmpfs and still using it, but sudo fuser /dev/ptmx show no use of that file.



      Can someone explain this behavior?







      share|improve this question












      I have a btrfs root partition and I use snapper to automatically take snapshots.



      The /dev/ptmx file change between each snapshots despite /dev is mounted as a devtmpfs file system.



      I have tried creating a file in /dev, and as expected it is not snapshotted.



      My first intuition was that one service was started before /dev is mounted as a devtmpfs and still using it, but sudo fuser /dev/ptmx show no use of that file.



      Can someone explain this behavior?









      share|improve this question











      share|improve this question




      share|improve this question










      asked Apr 23 at 12:05









      pim

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