From: Jens Axboe <jens.axboe@oracle.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Block device files and the page cache
Date: Wed, 17 Mar 2010 11:22:52 +0100 [thread overview]
Message-ID: <20100317102252.GT5768@kernel.dk> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1003161258280.1307-100000@iolanthe.rowland.org>
On Tue, Mar 16 2010, Alan Stern wrote:
> Jens and Al:
>
> Simple testing seems to show that when a program closes a file
> descriptor for a block device file, the release method in the device
> driver's block_device_operations structure doesn't get called (and the
> close(2) system call doesn't return) until all the dirty pages for that
> device have been written out.
>
> Can anyone confirm that this always happens? Where in the kernel
> source is this handled?
Alan, see fs/block_dev.c:__blkdev_put(). The last put of the device will
sync the device before calling fops->release().
--
Jens Axboe
next prev parent reply other threads:[~2010-03-17 10:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-16 17:08 Block device files and the page cache Alan Stern
2010-03-17 10:22 ` Jens Axboe [this message]
2010-03-17 15:30 ` Alan Stern
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