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authorWu Fengguang <fengguang.wu@intel.com>2010-07-22 08:50:57 +0400
committerWu Fengguang <fengguang.wu@intel.com>2011-06-08 04:25:20 +0400
commitcb9bd1159c5fe8995e151fa7df10fa19f8c119cc (patch)
tree3f2dd37182180cf85cd9e23d989b7fd7eceb1d63 /include/linux/writeback.h
parent94c3dcbb0b0cdfd82cedd21705424d8044edc42c (diff)
downloadlinux-cb9bd1159c5fe8995e151fa7df10fa19f8c119cc.tar.xz
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.h1
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