On Fri, 31 Oct 2008, Wietse Venema wrote:

Does XFS still overwrite existing files with zeros, when those
files were open for write at the time of unclean shutdown? This
I believe this was fixed in an early 2.6.2x release, cc'ing xfs mailing list to confirm.

would violate a basic requirement of Postfix (don't lose data after
fsync).  Postfix updates existing files all the time: it updates
queue files as it marks recipients as done, and it updates mailbox
files as it appends mail.

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