From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Sun, 18 Jul 2010 01:42:26 +0000 (+0900)
Subject: nilfs2: apply read-ahead for nilfs_btree_lookup_contig
X-Git-Tag: v2.6.36-rc1~500^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03bdb5ac58a2144dfe8cfd73347fdb9f57e2e062;p=pandora-kernel.git

nilfs2: apply read-ahead for nilfs_btree_lookup_contig

This applies read-ahead to nilfs_btree_do_lookup and
nilfs_btree_lookup_contig functions and extends them to read ahead
siblings of level 1 btree nodes that hold data blocks.

At present, the read-ahead is not applied to most btree operations;
only get_block() callback function, which is used during read of
regular files or directories, receives the benefit.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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