From c41f3cc3ae34acdbcec328084b4b74f686c02f0d Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 29 Apr 2016 16:17:09 -0700
Subject: [PATCH] f2fs: inject page allocation failures

This patch adds page allocation failures.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/f2fs.h  | 9 +++++++++
 fs/f2fs/super.c | 1 +
 2 files changed, 10 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index cf03c57d0feb..d550a95d30f1 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -40,6 +40,7 @@
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 enum {
 	FAULT_KMALLOC,
+	FAULT_PAGE_ALLOC,
 	FAULT_MAX,
 };
 
@@ -1296,6 +1297,14 @@ static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)
 static inline struct page *f2fs_grab_cache_page(struct address_space *mapping,
 						pgoff_t index, bool for_write)
 {
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	struct page *page = find_lock_page(mapping, index);
+	if (page)
+		return page;
+
+	if (time_to_inject(FAULT_PAGE_ALLOC))
+		return NULL;
+#endif
 	if (!for_write)
 		return grab_cache_page(mapping, index);
 	return grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 9a56f544da3e..986d0da84e01 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -45,6 +45,7 @@ atomic_t f2fs_ops;
 
 char *fault_name[FAULT_MAX] = {
 	[FAULT_KMALLOC]		= "kmalloc",
+	[FAULT_PAGE_ALLOC]	= "page alloc",
 };
 #endif
 
-- 
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