From: David Chinner <dgc@sgi.com>
To: Bhagi rathi <jahnu77@gmail.com>
Cc: David Chinner <dgc@sgi.com>, xfs@oss.sgi.com
Subject: Re: TAKE 972756 - Implement fallocate.
Date: Tue, 6 Nov 2007 11:12:23 +1100 [thread overview]
Message-ID: <20071106001223.GY66820511@sgi.com> (raw)
In-Reply-To: <cc7060690711051042h5c39c540mf60f95e2f67c7bd7@mail.gmail.com>
On Tue, Nov 06, 2007 at 12:12:52AM +0530, Bhagi rathi wrote:
> David, What happens if offset is not aligned to 4k? Let's say we have a file
> whose size is
> not aligned to 4k. It could have blocks beyond the eof which haven't been
> zero'ed out.
No it won't. They are *preallocated* blocks, which by definition are
zero-filled. Preallocated blocks are marked as unwritten on disk, so
it is known that they contain zeros, even if they lie beyond EOF.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
next prev parent reply other threads:[~2007-11-06 0:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-02 2:43 TAKE 972756 - Implement fallocate David Chinner
2007-11-05 18:42 ` Bhagi rathi
2007-11-06 0:12 ` David Chinner [this message]
2007-11-06 17:27 ` Bhagi rathi
2007-11-06 19:04 ` Eric Sandeen
2007-11-06 20:41 ` David Chinner
2007-11-06 22:38 ` Nathan Scott
2007-11-07 5:42 ` Bhagi rathi
2007-11-07 9:35 ` nscott
2007-12-10 17:50 ` Eric Sandeen
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