From: Dave Chinner <david@fromorbit.com>
To: Theodore Ts'o <tytso@mit.edu>, Namjae Jeon <linkinjeon@gmail.com>,
adilger.kernel@dilger.ca, bpm@sgi.com, elder@kernel.org,
hch@infradead.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org,
xfs@oss.sgi.com, a.sangwan@samsung.com,
Namjae Jeon <namjae.jeon@samsung.com>
Subject: Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE
Date: Thu, 1 Aug 2013 10:23:41 +1000 [thread overview]
Message-ID: <20130801002341.GI7118@dastard> (raw)
In-Reply-To: <20130731220154.GA11378@thunk.org>
On Wed, Jul 31, 2013 at 06:01:54PM -0400, Theodore Ts'o wrote:
> Have you considered what happens if you have a 10 megabyte file, of
> which the first 5 megs are mmap'ed into a userspace process.
>
> Now suppose you call COLLAPASE_RANGE on a one megabyte range starting
> at offset 1024k from the beginning of the file.
>
> Does the right thing happen to the mmap'ed region in memory?
Implementation detail. like a hole punch, it needs to invalidate the
range that it is operating over so mmap()d regions are refaulted
after the operation is done.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2013-08-01 0:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-31 14:42 [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE Namjae Jeon
2013-07-31 22:01 ` Theodore Ts'o
2013-08-01 0:23 ` Dave Chinner [this message]
2013-08-01 0:46 ` Theodore Ts'o
2013-08-01 0:54 ` Dave Chinner
2013-08-01 1:07 ` Theodore Ts'o
2013-08-01 2:59 ` Dave Chinner
2013-08-01 4:06 ` Theodore Ts'o
2013-08-01 4:32 ` Dave Chinner
2013-08-01 0:22 ` Dave Chinner
2013-08-01 5:07 ` Namjae Jeon
2013-08-02 2:37 ` Dave Chinner
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