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Re: [PATCH] xfsrestore: use utimensat() to provide atime/mtime with ns r

To: Brian Foster <bfoster@xxxxxxxxxx>
Subject: Re: [PATCH] xfsrestore: use utimensat() to provide atime/mtime with ns resolution
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 5 Sep 2014 10:45:01 +1000
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1409848708-42666-1-git-send-email-bfoster@xxxxxxxxxx>
References: <1409848708-42666-1-git-send-email-bfoster@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Sep 04, 2014 at 12:38:28PM -0400, Brian Foster wrote:
> xfsdump encodes and stores the full atime and mtime for each file with
> nanosecond resolution. xfsrestore uses utime() to set the times of each
> file that is restored. The latter supports resolution of 1 second, thus
> sub-second timestamp data is lost on restore.

That doesn't seem like a big deal. What sort of problems does this
actually cause?

FYI, many linux filesystems only have second resolution timestamps
and hence applications can't rely on sub-second timestamp resolution
to actually mean anything useful....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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