[Bug 2132150] Re: dd: O_DIRECT partial block writes fail

[Julian Andres Klode]

** Bug watch added: github.com/uutils/coreutils/issues #9003
   https://github.com/uutils/coreutils/issues/9003

** Also affects: rust-coreutils via
   https://github.com/uutils/coreutils/issues/9003
   Importance: Unknown
       Status: Unknown

** Changed in: rust-coreutils (Ubuntu)
       Status: New => In Progress

** Changed in: rust-coreutils (Ubuntu)
   Importance: Undecided => High

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Title:
  dd: O_DIRECT partial block writes fail

Status in rust-coreutils:
  Unknown
Status in rust-coreutils package in Ubuntu:
  In Progress

Bug description:
  In the rust-coreutils versions currently in the archive, dd fails to
  write partial blocks with the O_DIRECT flag. This is currently causing
  autopkgtest failures for packages such as cryptsetup.

  This issue is known upstream[1] and has been fixed in rust-coreutils
  0.4.0[2].

  Upgrading rust-coreutils to 0.4.0 will fix this bug.

  ================
  Bug reproduction
  ================
  Create a file with a size that's not a multiple of block size (3 8K blocks + 511 bytes):

  root at test:~# for run in {1..25087}; do echo -n -e '\x42' >> test_direct_input.iso; done
  root at test:~# dd if=/root/test_direct_input.iso of=/root/test_direct_output.img oflag=direct bs=8192 status=none
  dd: IO error: Invalid input

  This bug is reproducible for rust-coreutils 0.2.2 and 0.3.0.

  [1]: https://github.com/uutils/coreutils/issues/9003
  [2]: https://github.com/uutils/coreutils/pull/9016

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