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[Dan Watkins <daniel.watkins@xxxxxxxxxxxxx>]

This bug is believed to be fixed in cloud-init in version 20.1. If this
is still a problem for you, please make a comment and set the state back
to New

Thank you.

** Changed in: cloud-init
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1781781

Title:
  /swap.img w/fallocate has holes

Status in cloud-init:
  Fix Released
Status in curtin:
  Confirmed

Bug description:
  The /swap.img file on an XFS root filesystem is not being used. The
  dmesg says it "has holes".

  From the swapon manpage;

  The swap file implementation in the kernel expects to be able to write
  to the file directly, without the assistance of the filesystem.  This
  is a problem on preallocated files (e.g.  fallocate(1)) on filesystems
  like XFS or ext4, and on copy-on-write filesystems like btrfs.

  It is recommended to use dd(1) and /dev/zero to avoid holes on XFS and
  ext4.

  
  I've tracked down this commit which seems to be a step in the right direction;

  https://github.com/CanonicalLtd/curtin/commit/a909966f9c235282267024e86adf404dab83ccfe

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