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| author | Wu Fengguang <fengguang.wu@intel.com> | 2010-07-21 22:50:57 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-06-08 08:25:20 +0800 |
| commit | cb9bd1159c5fe8995e151fa7df10fa19f8c119cc (patch) | |
| tree | 3f2dd37182180cf85cd9e23d989b7fd7eceb1d63 /include/linux/writeback.h | |
| parent | 94c3dcbb0b0cdfd82cedd21705424d8044edc42c (diff) | |
| download | linux-cb9bd1159c5fe8995e151fa7df10fa19f8c119cc.tar.gz linux-cb9bd1159c5fe8995e151fa7df10fa19f8c119cc.tar.bz2 linux-cb9bd1159c5fe8995e151fa7df10fa19f8c119cc.zip | |
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>
Diffstat (limited to 'include/linux/writeback.h')
| -rw-r--r-- | include/linux/writeback.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 3f6542ca6198..7df9026f7129 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -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 |