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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/super.c
parent077b1f83a69d94f2918630a882d74939baca0bce (diff)
downloadop-kernel-dev-c515e1fd361c2a08a9c2eb139396ec30a4f477dc.zip
op-kernel-dev-c515e1fd361c2a08a9c2eb139396ec30a4f477dc.tar.gz
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/super.c')
-rw-r--r--fs/super.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index 8a06881..b383fa4 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -31,6 +31,7 @@
#include <linux/mutex.h>
#include <linux/backing-dev.h>
#include <linux/rculist_bl.h>
+#include <linux/cleancache.h>
#include "internal.h"
@@ -112,6 +113,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
s->s_maxbytes = MAX_NON_LFS;
s->s_op = &default_op;
s->s_time_gran = 1000000000;
+ s->cleancache_poolid = -1;
}
out:
return s;
@@ -177,6 +179,7 @@ void deactivate_locked_super(struct super_block *s)
{
struct file_system_type *fs = s->s_type;
if (atomic_dec_and_test(&s->s_active)) {
+ cleancache_flush_fs(s);
fs->kill_sb(s);
/*
* We need to call rcu_barrier so all the delayed rcu free
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