f2fs: inject page allocation failures

This patch adds page allocation failures.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

2 files changed, 10 insertions, 0 deletions

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