From: Christoph Hellwig <hch@infradead.org>
To: Jeff Liu <jeff.liu@oracle.com>
Cc: xfs@oss.sgi.com
Subject: Re: SEEK_DATA/SEEK_HOLE support
Date: Sun, 2 Oct 2011 13:59:02 -0400 [thread overview]
Message-ID: <20111002175902.GA9420@infradead.org> (raw)
In-Reply-To: <4E888C0D.9060701@oracle.com>
On Mon, Oct 03, 2011 at 12:06:37AM +0800, Jeff Liu wrote:
> IMHO, to avoid data loss in some user application like cp(1), for
> unwritten extents, we always need to check the pages status. Just as
> you mentioned above, return the map offset if pages are dirty for
> SEEK_DATA, or a hole found.
I'd suggest to first implement the simple versions I schemed below,
which would treat unwritten extents as data. That is sub-optimal,
but a) safe and b) easy to implement. The second step would be to
add probing for unwritten extents, which is even something we could
do as a common helper routine shared by filesystems.
And the most important thing is of course adding QA for it. Josef
already wrote an xfstests case that needs to be resurrected, compared
against the latest Posix draft and if nessecary updated.
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next prev parent reply other threads:[~2011-10-02 17:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-02 15:04 SEEK_DATA/SEEK_HOLE support Jeff Liu
2011-10-02 15:42 ` Christoph Hellwig
2011-10-02 16:06 ` Jeff Liu
2011-10-02 17:59 ` Christoph Hellwig [this message]
2011-10-02 19:11 ` Andi Kleen
2011-10-03 4:04 ` Jeff Liu
2011-10-03 23:43 ` Dave Chinner
2011-10-04 13:02 ` Christoph Hellwig
2011-10-05 4:36 ` Dave Chinner
2011-10-05 5:32 ` Jeff Liu
2011-10-05 9:23 ` Dave Chinner
2011-10-05 13:56 ` Jeff Liu
2011-10-05 7:34 ` Michael Monnerie
2011-10-05 9:36 ` Dave Chinner
2011-10-05 18:22 ` Michael Monnerie
2011-10-06 0:32 ` Dave Chinner
2011-11-14 10:24 ` Christoph Hellwig
2011-11-14 12:47 ` Jeff Liu
2011-11-14 12:50 ` Christoph Hellwig
2011-11-19 8:29 ` XFS SEEK_DATA/SEEK_HOLE support V1 Jeff Liu
2011-11-19 8:34 ` Jeff Liu
2011-11-19 8:37 ` [PATCH] Introduce SEEK_DATA/SEEK_HOLE support to XFS V1 Jeff Liu
2011-11-19 19:11 ` Christoph Hellwig
2011-11-20 13:15 ` Jeff Liu
2011-11-20 0:30 ` Dave Chinner
2011-11-20 13:59 ` Jeff Liu
2011-11-20 15:30 ` Christoph Hellwig
2011-11-20 22:34 ` Dave Chinner
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