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Cleancache [PATCH 5/7] (was Transcendent Memory): btrfs hooks
Filesystems must explicitly enable cleancache. Also, btrfs
uses its own readpage which must be hooked.
Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Signed-off-by: Chris Mason <chris.mason@xxxxxxxxxx>
Diffstat:
extent_io.c | 9 +++++++++
super.c | 2 ++
2 files changed, 11 insertions(+)
--- linux-2.6.34-rc5/fs/btrfs/super.c 2010-04-19 17:29:56.000000000 -0600
+++ linux-2.6.34-rc5-cleancache/fs/btrfs/super.c 2010-04-21 10:08:39.000000000 -0600
@@ -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"
@@ -477,6 +478,7 @@ static int btrfs_fill_super(struct super
sb->s_root = root_dentry;
save_mount_options(sb, data);
+ sb->cleancache_poolid = cleancache_init_fs(PAGE_SIZE);
return 0;
fail_close:
--- linux-2.6.34-rc5/fs/btrfs/extent_io.c 2010-04-19 17:29:56.000000000 -0600
+++ linux-2.6.34-rc5-cleancache/fs/btrfs/extent_io.c 2010-04-21 10:07:31.000000000 -0600
@@ -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"
@@ -2030,6 +2031,13 @@ static int __extent_read_full_page(struc
set_page_extent_mapped(page);
+ if (!PageUptodate(page)) {
+ if (cleancache_get_page(page) == 1) {
+ BUG_ON(blocksize != PAGE_SIZE);
+ goto out;
+ }
+ }
+
end = page_end;
lock_extent(tree, start, end, GFP_NOFS);
@@ -2146,6 +2154,7 @@ static int __extent_read_full_page(struc
cur = cur + iosize;
page_offset += iosize;
}
+out:
if (!nr) {
if (!PageError(page))
SetPageUptodate(page);
--
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