linux-kernel - Improve lseek scalability v3

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Date:	Thu, 15 Sep 2011 16:06:46 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	viro@...iv.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Improve lseek scalability v3

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.

v2: Forward ported to recent kernel. Add SEEK_DATA/HOLE support.
Fix a nasty SEEK_END bug in the previous version.
v3: No changes, except rebase. All reviews passed. Just reposting 
for merging.

-Andi
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