From: Chao Yu <yuchao0@huawei.com>
Date: Wed, 29 Jul 2020 13:21:35 +0000 (+0800)
Subject: f2fs: compress: add sanity check during compressed cluster read
X-Git-Tag: v5.9-rc1~69^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a86d27dd3dbed4d870c6582b8d4bf1fd0f653914;p=thirdparty%2Fkernel%2Flinux.git

f2fs: compress: add sanity check during compressed cluster read

In f2fs_read_multi_pages(), we don't have to check cluster's type
again, since overwrite or partial truncation need page lock in
cluster which has already been held by reader, so cluster's type
is stable, let's change check condition to sanity check.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index bc89bc987513e..c1b676be67b9a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2170,9 +2170,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 	if (ret)
 		goto out;
 
-	/* cluster was overwritten as normal cluster */
-	if (dn.data_blkaddr != COMPRESS_ADDR)
-		goto out;
+	f2fs_bug_on(sbi, dn.data_blkaddr != COMPRESS_ADDR);
 
 	for (i = 1; i < cc->cluster_size; i++) {
 		block_t blkaddr;