linux-kernel - [PATCH 5/5] f2fs: enforce fsync_mode=strict for renamed directory

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Date:   Tue, 24 Apr 2018 23:46:13 -0600
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 5/5] f2fs: enforce fsync_mode=strict for renamed directory

This is to give a option for user to be able to recover B/foo in the below
case.

mkdir A
sync()
rename(A, B)
creat (B/foo)
fsync (B/foo)
---crash---

Sugessted-by: Velayudhan Pillai <vijay@...utexas.edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/namei.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index b5f404674cad..fef6e3ab2135 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -973,8 +973,11 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			f2fs_put_page(old_dir_page, 0);
 		f2fs_i_links_write(old_dir, false);
 	}
-	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
+	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 		add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
+		if (S_ISDIR(old_inode->i_mode))
+			add_ino_entry(sbi, old_inode->i_ino, TRANS_DIR_INO);
+	}
 
 	f2fs_unlock_op(sbi);
 
-- 
2.17.0.484.g0c8726318c-goog