From dfb55a78983b7657bac4ab9e0dffa33da01786b6 Mon Sep 17 00:00:00 2001
From: Chao Yu <chao@kernel.org>
Date: Wed, 7 Aug 2024 18:24:35 +0800
Subject: [PATCH] f2fs: atomic: fix to truncate pagecache before on-disk
 metadata truncation

BugLink: https://bugs.launchpad.net/bugs/2089340

[ Upstream commit ebd3309aec6271c4616573b0cb83ea25e623070a ]

We should always truncate pagecache while truncating on-disk data.

Fixes: a46bebd502fe ("f2fs: synchronize atomic write aborts")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
---
 fs/f2fs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9d8f5e27e919..6af403d24577 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2167,6 +2167,10 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
 		F2FS_I(fi->cow_inode)->atomic_inode = inode;
 	} else {
 		/* Reuse the already created COW inode */
+		f2fs_bug_on(sbi, get_dirty_pages(fi->cow_inode));
+
+		invalidate_mapping_pages(fi->cow_inode->i_mapping, 0, -1);
+
 		ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
 		if (ret) {
 			f2fs_up_write(&fi->i_gc_rwsem[WRITE]);