linux-ext4 - [PATCH] ext4:fix different behavior of fsync when use fast commit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Mon, 15 Nov 2021 18:09:50 +0800
From:   Xin Yin <yinxin.x@...edance.com>
To:     tytso@....edu, adilger.kernel@...ger.ca,
        harshadshirwadkar@...il.com
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xin Yin <yinxin.x@...edance.com>
Subject: [PATCH] ext4:fix different behavior of fsync when use fast commit

For the follow test example:
-mkdir test/
-create&write test/a.txt
-fsync test/a.txt
-crash (before a full commit)

If fast commit is used then "a.txt" will lost, while the normal
journaling can recover it.

We should keep behavior of fsync unchanged when use fast commit.

other report: https://www.spinics.net/lists/linux-ext4/msg80514.html

Signed-off-by: Xin Yin <yinxin.x@...edance.com>
---
 fs/ext4/fast_commit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 8ea5a81e6554..2fc573575ebc 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -523,7 +523,7 @@ void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
 	args.op = EXT4_FC_TAG_CREAT;
 
 	ret = ext4_fc_track_template(handle, inode, __track_dentry_update,
-					(void *)&args, 0);
+					(void *)&args, 1);
 	trace_ext4_fc_track_create(inode, dentry, ret);
 }
 
-- 
2.20.1