f2fs: cache: support fault injection

This patch adds fault injection support for metadata cache allocations
to improve error-path test coverage.
- it integrates entry allocations with FAULT_KMALLOC

Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 14 insertions, 10 deletions

diff --git a/fs/f2fs/cache.c b/fs/f2fs/cache.c
index a56982a02585..0814c38b24bc 100644
--- a/fs/f2fs/cache.c
+++ b/fs/f2fs/cache.c
@@ -154,23 +154,27 @@ static struct f2fs_cached_block *f2fs_create_cache(
 		struct f2fs_cached_block_list *cache,
 		unsigned long index, bool nofail)
 {
+	struct f2fs_sb_info *sbi = cache->sbi;
 	struct f2fs_cached_block *entry;
 	unsigned int flags = GFP_NOFS;
 
 	if (index == ULONG_MAX)
 		return ERR_PTR(-ERANGE);
 
-	if (nofail)
+	if (nofail) {
 		flags |= __GFP_NOFAIL;
-
-	entry = kzalloc_obj(*entry, flags);
-	if (!entry)
-		return ERR_PTR(-ENOMEM);
-
-	entry->data = kmalloc(cache->sbi->blocksize, flags);
-	if (!entry->data) {
-		kfree(entry);
-		return ERR_PTR(-ENOMEM);
+		entry = kzalloc_obj(*entry, flags);
+		entry->data = kmalloc(sbi->blocksize, flags);
+	} else {
+		entry = f2fs_kzalloc(sbi, sizeof(*entry), flags);
+		if (!entry)
+			return ERR_PTR(-ENOMEM);
+
+		entry->data = f2fs_kmalloc(sbi, sbi->blocksize, flags);
+		if (!entry->data) {
+			kfree(entry);
+			return ERR_PTR(-ENOMEM);
+		}
 	}
 	entry->index = index;