linux-kernel - [PATCH] f2fs: fix to return 0 if err == -ENOENT in f2fs

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Date:	Wed, 27 Apr 2016 20:32:37 +0800
From:	Yunlong Song <yunlong.song@...wei.com>
To:	<jaegeuk@...nel.org>, <cm224.lee@...sung.com>,
	<yuchao0@...wei.com>, <chao@...nel.org>, <sylinux@....com>,
	<yunlong.song@...wei.com>
CC:	<bintian.wang@...wei.com>, <houpengyang@...wei.com>,
	<heyunlei@...wei.com>, <liushuoran@...wei.com>,
	<shiguojun@...wei.com>, <linux-f2fs-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] f2fs: fix to return 0 if err == -ENOENT in f2fs_readdir

Commit 57b62d29ad5b384775974973087d47755a8c6fcc ("f2fs: fix to report
error in f2fs_readdir") causes f2fs_readdir to return -ENOENT when
get_lock_data_page returns -ENOENT. However, the original logic is to
continue when get_lock_data_page returns -ENOENT, but it forgets to
reset err to 0.

This will cause getdents64 incorretly return -ENOENT when lastdirent is
NULL in getdents64. This will lead to a wrong return value for syscall
caller.

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
---
 fs/f2fs/dir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 0ad7b9a..3ed6145 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -886,6 +886,7 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
 		kunmap(dentry_page);
 		f2fs_put_page(dentry_page, 1);
 	}
+	err = 0;
 out:
 	fscrypt_fname_free_buffer(&fstr);
 	return err;
-- 
1.8.5.2