From: Itaru Kitayama <kitayama@cl.bb4u.ne.jp>
Date: Mon, 25 Apr 2011 23:43:51 +0000 (-0400)
Subject: btrfs: fix wrong allocating flag when reading page
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=43e817a1fdda17f3357602ed7964c248c8c53ae0;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

btrfs: fix wrong allocating flag when reading page

the space cache use extent_readpages() to read free space information,
so we can not use GFP_KERNEL flag to allocate memory, or it may lead
to deadlock.

Signed-off-by: Itaru Kitayama <kitayama@cl.bb4u.ne.jp>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5ae0bffaa4d..0d1196d6f78 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2681,7 +2681,7 @@ int extent_readpages(struct extent_io_tree *tree,
 		prefetchw(&page->flags);
 		list_del(&page->lru);
 		if (!add_to_page_cache_lru(page, mapping,
-					page->index, GFP_KERNEL)) {
+					page->index, GFP_NOFS)) {
 			__extent_read_full_page(tree, page, get_extent,
 						&bio, 0, &bio_flags);
 		}