From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 1 Feb 2012 01:19:02 +0000 (-0500)
Subject: Btrfs: don't use crc items bigger than 4KB
X-Git-Tag: v3.4-rc3~11^2~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7ca4be45a0255ac8f08c05491c6add2dd87dd4f8;p=platform%2Fkernel%2Flinux-exynos.git

Btrfs: don't use crc items bigger than 4KB

With the big metadata blocks, we can have crc items
that are much bigger than a page.  There are a few
places that we try to kmalloc memory to hold the
items during a split.

Items bigger than 4KB don't really have a huge benefit
in efficiency, but they do trigger larger order allocations.
This commits changes the csums to make sure they stay under
4KB.  This is not a format change, just a #define to limit
huge items.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index a14dbca..cab0ffb 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -25,10 +25,12 @@
 #include "transaction.h"
 #include "print-tree.h"
 
-#define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
+#define __MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
 				   sizeof(struct btrfs_item) * 2) / \
 				  size) - 1))
 
+#define MAX_CSUM_ITEMS(r, size) (min(__MAX_CSUM_ITEMS(r, size), PAGE_CACHE_SIZE))
+
 #define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
 				   sizeof(struct btrfs_ordered_sum)) / \
 				   sizeof(struct btrfs_sector_sum) * \