From: Wu Fengguang <fengguang.wu@intel.com>
Date: Thu, 22 Jul 2010 04:50:57 +0000 (-0600)
Subject: writeback: introduce writeback_control.inodes_written
X-Git-Tag: v3.1-rc1~228^2~24
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb9bd1159c5fe8995e151fa7df10fa19f8c119cc;p=pandora-kernel.git

writeback: introduce writeback_control.inodes_written

The flusher works on dirty inodes in batches, and may quit prematurely
if the batch of inodes happen to be metadata-only dirtied: in this case
wbc->nr_to_write won't be decreased at all, which stands for "no pages
written" but also mis-interpreted as "no progress".

So introduce writeback_control.inodes_written to count the inodes get
cleaned from VFS POV.  A non-zero value means there are some progress on
writeback, in which case more writeback can be tried.

Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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