[PATCH 7.3.y] f2fs: fix to fetch ino via ino_of_node() under cache lock

[Sasha Levin <sashal@kernel.org>]

From: Chao Yu <chao@kernel.org>

[ Upstream commit cd6d8b1891395b681f2060916a4b83880b765698 ]

In f2fs_writeback_node_caches(), it's better to fetch ino via ino_of_node()
under cache lock, otherwise, node cache content may become stale after cache
is unlocked due to racing w/ truncation.

Commit 493b9dc8b52c ("f2fs: cache: use node cache") fixes similar issue in
f2fs_flush_inline_data() introduced in commit 34c061ad85a2 ("f2fs: Avoid double
lock for cp_rwsem during checkpoint").

Cc: stable@kernel.org
Fixes: 2049d4fcb057 ("f2fs: avoid multiple node page writes due to inline_data")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[ sashal: adapted cache-entry operations in f2fs_writeback_node_caches() to folio operations in f2fs_sync_node_pages() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/node.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index b23fe1383009a..afb8de517e7ad 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2183,9 +2183,11 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
 
 			/* flush inline_data */
 			if (folio_test_f2fs_inline(folio)) {
+				nid_t ino = ino_of_node(folio);
+
 				folio_clear_f2fs_inline(folio);
 				folio_unlock(folio);
-				flush_inline_data(sbi, ino_of_node(folio));
+				flush_inline_data(sbi, ino);
 				goto lock_node;
 			}
 
-- 
2.53.0