writeback: introduce writeback_control.inodes_written
authorWu Fengguang <fengguang.wu@intel.com>
Thu, 22 Jul 2010 04:50:57 +0000 (22:50 -0600)
committerWu Fengguang <fengguang.wu@intel.com>
Wed, 8 Jun 2011 00:25:20 +0000 (08:25 +0800)
commitcb9bd1159c5fe8995e151fa7df10fa19f8c119cc
tree3f2dd37182180cf85cd9e23d989b7fd7eceb1d63
parent94c3dcbb0b0cdfd82cedd21705424d8044edc42c
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>
fs/fs-writeback.c
include/linux/writeback.h