tree f957cdf5202a01eaa4cb9ac97261205304005309
parent 0efa9f48c7e6c15e75946dd2b1c82d3d19e13545
author Mark Fasheh <mfasheh@suse.de> 1435700528 -0700
committer Chris Mason <clm@fb.com> 1435796237 -0700

btrfs: don't update mtime/ctime on deduped inodes

One issue users have reported is that dedupe changes mtime on files,
resulting in tools like rsync thinking that their contents have changed when
in fact the data is exactly the same. We also skip the ctime update as no
user-visible metadata changes here and we want dedupe to be transparent to
the user.

Clone still wants time changes, so we special case this in the code.

This was tested with the btrfs-extent-same tool.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Chris Mason <clm@fb.com>