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From: Theodore Ts'o <tytso@mit.edu>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: adilger.kernel@dilger.ca, bpm@sgi.com, elder@kernel.org,
	hch@infradead.org, david@fromorbit.com,
	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: Wed, 31 Jul 2013 18:01:54 -0400	[thread overview]
Message-ID: <20130731220154.GA11378@thunk.org> (raw)
In-Reply-To: <1375281721-15840-1-git-send-email-linkinjeon@gmail.com>

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?

Cheers,

					- Ted

WARNING: multiple messages have this Message-ID (diff)
From: Theodore Ts'o <tytso@mit.edu>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: elder@kernel.org, Namjae Jeon <namjae.jeon@samsung.com>,
	linux-kernel@vger.kernel.org, xfs@oss.sgi.com, hch@infradead.org,
	bpm@sgi.com, adilger.kernel@dilger.ca, a.sangwan@samsung.com,
	linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE
Date: Wed, 31 Jul 2013 18:01:54 -0400	[thread overview]
Message-ID: <20130731220154.GA11378@thunk.org> (raw)
In-Reply-To: <1375281721-15840-1-git-send-email-linkinjeon@gmail.com>

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?

Cheers,

					- Ted

_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs

  reply	other threads:[~2013-07-31 22:02 UTC|newest]

Thread overview: 24+ 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 14:42 ` Namjae Jeon
2013-07-31 22:01 ` Theodore Ts'o [this message]
2013-07-31 22:01   ` Theodore Ts'o
2013-08-01  0:23   ` Dave Chinner
2013-08-01  0:23     ` Dave Chinner
2013-08-01  0:46     ` Theodore Ts'o
2013-08-01  0:46       ` Theodore Ts'o
2013-08-01  0:54       ` Dave Chinner
2013-08-01  0:54         ` Dave Chinner
2013-08-01  1:07         ` Theodore Ts'o
2013-08-01  1:07           ` Theodore Ts'o
2013-08-01  2:59           ` Dave Chinner
2013-08-01  2:59             ` Dave Chinner
2013-08-01  4:06             ` Theodore Ts'o
2013-08-01  4:06               ` Theodore Ts'o
2013-08-01  4:32               ` Dave Chinner
2013-08-01  4:32                 ` Dave Chinner
2013-08-01  0:22 ` Dave Chinner
2013-08-01  0:22   ` Dave Chinner
2013-08-01  5:07   ` Namjae Jeon
2013-08-01  5:07     ` Namjae Jeon
2013-08-02  2:37     ` Dave Chinner
2013-08-02  2:37       ` Dave Chinner

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