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    SubjectRe: [PATCH] O_NOATIME support
    On Fri, Jun 11, 2004 at 10:11:29PM -0300, Cesar Eduardo Barros wrote:
    > (not subscribed to lkml, please CC: me on replies)
    >
    > This patch adds support for the O_NOATIME open flag (GNU extension):
    >
    > int O_NOATIME Macro
    > If this bit is set, read will not update the access time of the file.
    > See File Times. This is used by programs that do backups, so that
    > backing a file up does not count as reading it. Only the owner of the
    > file or the superuser may use this bit.
    >
    > It is useful if you want to do something with the file atime (for
    > instance, moving files that have not been accessed in a while to
    > somewhere else, or something like Debian's popularity-contest) but you
    > also want to read all files periodically (for instance, tripwire or
    > debsums).
    >
    > Currently, the program that reads all files periodically has to use
    > utimes, which can race with the atime update:

    Any chance we could change the flag to also not update mtime and ctime
    for updates on a fd opened with it (and renaming it to O_INVISIBLE for
    example). That's needed for your above moving infrequently used files
    away scenario (aka a HSM)

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