Hello all,
Attached is a patch to add O_NOATIME support to GNU tar. This allows one
to make backups without changing atime, mtime, or ctime on regular
files. O_NOATIME requires kernel 2.6.8 or greater, along with
appropriate system headers, but this patch will still compile without
those things.
O_NOATIME doesn't work if you aren't the owner of the file in question
(or root), if the file is on an unsupported filesystem (like NFS), or if
the file is a symlink.
Because of these limitations, and because of the very different
side-effects, I have added a new option --no-atime, rather than extend
the existing --preserve-atime option. The option exists (as a no-op),
even if configure did not find required system headers. --no-atime does
not at present interact with --preserve-atime, because it is impossible
at present to know if O_NOATIME is actually working, at least under
certain circumstances.
Comments are appreciated. Let me know if you have any criticisms, or if
there is something else I must to do get this patch into the distribution.
Cheers,
--Ian Turner
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