From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Sun, 18 Jul 2010 01:42:23 +0000 (+0900)
Subject: nilfs2: add read ahead mode to nilfs_btnode_submit_block
X-Git-Tag: v2.6.36-rc1~500^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26dfdd8e29f28c08aa67861b3c83d0f3f7d30cee;p=pandora-kernel.git

nilfs2: add read ahead mode to nilfs_btnode_submit_block

This adds mode argument to nilfs_btnode_submit_block() function and
allows it to issue a read-ahead request.

An optional submit_ptr argument is also added to store the actual
block address for which bio is sent.  submit_ptr is used for a series
of read-ahead requests, and helps to decide if each requested block is
continous to the previous one on disk.

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