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

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Date:   Fri, 24 Dec 2021 14:57:28 +0800
From:   Xin Yin <yinxin.x@...edance.com>
To:     harshadshirwadkar@...il.com, tytso@....edu,
        adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xin Yin <yinxin.x@...edance.com>
Subject: [PATCH RESEND] 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 3deb97b22ca4..4b843648ffe5 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -423,7 +423,7 @@ 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