From: Miklos Szeredi <miklos@szeredi.hu>
Date: Tue, 14 Apr 2009 17:48:41 +0000 (+0200)
Subject: splice: add helpers for locking pipe inode
X-Git-Tag: v2.6.30-rc3~88^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61e0d47c33cc371f725bcda4a47ae0efe652dba8;p=pandora-kernel.git

splice: add helpers for locking pipe inode

There are lots of sequences like this, especially in splice code:

	if (pipe->inode)
		mutex_lock(&pipe->inode->i_mutex);
	/* do something */
	if (pipe->inode)
		mutex_unlock(&pipe->inode->i_mutex);

so introduce helpers which do the conditional locking and unlocking.
Also replace the inode_double_lock() call with a pipe_double_lock()
helper to avoid spreading the use of this functionality beyond the
pipe code.

This patch is just a cleanup, and should cause no behavioral changes.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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