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btrfs: add cleancache support 

This sixth patch of eight in this cleancache series "opts-in"
cleancache for btrfs.  Filesystems must explicitly enable
cleancache by calling cleancache_init_fs anytime an instance
of the filesystem is mounted.  Btrfs uses its own readpage
which must be hooked, but all other cleancache hooks are in
the VFS layer including the matching cleancache_flush_fs hook
which must be called on unmount.

Details and a FAQ can be found in Documentation/vm/cleancache.txt

[v6-v8: no changes]
[v5: jeremy@goop.org: simplify init hook and any future fs init changes]
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Chris Mason <chris.mason@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>
This commit is contained in:
Dan Magenheimer 2011-05-26 10:01:56 -06:00
parent d71bc6db5e
commit 90a887c9a2
2 changed files with 11 additions and 0 deletions
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9
fs/btrfs/extent_io.c
View File

@ -10,6 +10,7 @@
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include <linux/cleancache.h>
#include "extent_io.h"
#include "extent_map.h"
#include "compat.h"
@ -2015,6 +2016,13 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
set_page_extent_mapped(page);
if (!PageUptodate(page)) {
if (cleancache_get_page(page) == 0) {
BUG_ON(blocksize != PAGE_SIZE);
goto out;
}
}
end = page_end;
while (1) {
lock_extent(tree, start, end, GFP_NOFS);
@ -2148,6 +2156,7 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
cur = cur + iosize;
page_offset += iosize;
}
out:
if (!nr) {
if (!PageError(page))
SetPageUptodate(page);

2
fs/btrfs/super.c
View File

@ -39,6 +39,7 @@
#include <linux/miscdevice.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/cleancache.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
@ -624,6 +625,7 @@ static int btrfs_fill_super(struct super_block *sb,
sb->s_root = root_dentry;
save_mount_options(sb, data);
cleancache_init_fs(sb);
return 0;
fail_close: