From: Bryan Schumaker <bjschuma@netapp.com>
Date: Fri, 24 Sep 2010 18:48:42 +0000 (-0400)
Subject: NFS: add readdir cache array
X-Git-Tag: v2.6.37-rc1~120^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1bacf9eb2fd0e7ef870acf84b9e3b157dcfa7dc;p=pandora-kernel.git

NFS: add readdir cache array

This patch adds the readdir cache array and functions to retreive the array
stored on a cache page, clear the array by freeing allocated memory, add an
entry to the array, and search the array for a given cookie.

It then modifies readdir to make use of the new cache array.
With the new cache array method, we no longer need some of this code.

Finally, nfs_llseek_dir() will set file->f_pos to a value greater than 0 and
desc->dir_cookie to zero.  When we see this, readdir needs to find the file
at position file->f_pos from the start of the directory.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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