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authorDan Magenheimer <dan.magenheimer@oracle.com>2011-05-26 10:01:43 -0600
committerDan Magenheimer <dan.magenheimer@oracle.com>2011-05-26 10:01:43 -0600
commitc515e1fd361c2a08a9c2eb139396ec30a4f477dc (patch)
treecb1a27f27f065400fc79dc287594843e169d74ab /fs/mpage.c
parent077b1f83a69d94f2918630a882d74939baca0bce (diff)
downloadlwn-c515e1fd361c2a08a9c2eb139396ec30a4f477dc.tar.gz
lwn-c515e1fd361c2a08a9c2eb139396ec30a4f477dc.zip
mm/fs: add hooks to support cleancache
This fourth patch of eight in this cleancache series provides the core hooks in VFS for: initializing cleancache per filesystem; capturing clean pages reclaimed by page cache; attempting to get pages from cleancache before filesystem read; and ensuring coherency between pagecache, disk, and cleancache. Note that the placement of these hooks was stable from 2.6.18 to 2.6.38; a minor semantic change was required due to a patchset in 2.6.39. All hooks become no-ops if CONFIG_CLEANCACHE is unset, or become a check of a boolean global if CONFIG_CLEANCACHE is set but no cleancache "backend" has claimed cleancache_ops. Details and a FAQ can be found in Documentation/vm/cleancache.txt [v8: minchan.kim@gmail.com: adapt to new remove_from_page_cache function] Signed-off-by: Chris Mason <chris.mason@oracle.com> Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Rik Van Riel <riel@redhat.com> Cc: Jan Beulich <JBeulich@novell.com> Cc: Andreas Dilger <adilger@sun.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <joel.becker@oracle.com> Cc: Nitin Gupta <ngupta@vflare.org>
Diffstat (limited to 'fs/mpage.c')
-rw-r--r--fs/mpage.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/mpage.c b/fs/mpage.c
index 0afc809e46e0..fdfae9fa98cd 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -27,6 +27,7 @@
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
+#include <linux/cleancache.h>
/*
* I/O completion handler for multipage BIOs.
@@ -271,6 +272,12 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
SetPageMappedToDisk(page);
}
+ if (fully_mapped && blocks_per_page == 1 && !PageUptodate(page) &&
+ cleancache_get_page(page) == 0) {
+ SetPageUptodate(page);
+ goto confused;
+ }
+
/*
* This page will go to BIO. Do we need to send this BIO off first?
*/