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writeback: introduce writeback_control.inodes_written

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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>
This commit is contained in:
Wu Fengguang 2010-07-21 22:50:57 -06:00
parent 94c3dcbb0b
commit cb9bd1159c
2 changed files with 5 additions and 0 deletions
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include/linux/writeback.h
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@ -34,6 +34,7 @@ struct writeback_control {
long nr_to_write; /* Write this many pages, and decrement
this for each page written */
long pages_skipped; /* Pages which were not written */
long inodes_written; /* # of inodes written (at least) */
/*
* For a_ops->writepages(): is start or end are non-zero then this is