linux-kernel - Improve lseek scalability

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Message-Id: <1314046152-2175-1-git-send-email-andi@firstfloor.org>
Date:	Mon, 22 Aug 2011 13:49:05 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	viro@...iv.linux.org.uk
Cc:	hch@...radead.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Improve lseek scalability

Currently generic_file_llseek users synchronize all on the inode i_mutex,
which is very heavy handed because it affects even different processes.

This patchkit attempts to make generic_file_llseek (mostly) lockless.

For details see the individual patches.

This is a repost of the earlier version which got some reviews.

v2: Forward ported to recent kernel. Add SEEK_DATA/HOLE support.
Fix a nasty SEEK_END bug in the previous version.

-Andi

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