linux-kernel - [PATCH 2/2] f2fs: Add error handling for negative returns from do_garbage

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Date: Fri, 22 Dec 2023 11:29:01 +0800
From: Yongpeng Yang <yangyongpeng1@...o.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>,
	Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Yongpeng Yang <yangyongpeng1@...o.com>
Subject: [PATCH 2/2] f2fs: Add error handling for negative returns from do_garbage_collect

The function do_garbage_collect can return a value less than 0 due
to f2fs_cp_error being true or page allocation failure, as a result
of calling f2fs_get_sum_page. However, f2fs_gc does not account for
such cases, which could potentially lead to an abnormal total_freed
and thus cause subsequent code to behave unexpectedly. Given that
an f2fs_cp_error is irrecoverable, and considering that
do_garbage_collect already retries page allocation errors through
its call to f2fs_get_sum_page->f2fs_get_meta_page_retry, any error
reported by do_garbage_collect should immediately terminate the
current GC.

Signed-off-by: Yongpeng Yang <yangyongpeng1@...o.com>
---
 fs/f2fs/gc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 405a6077bd83..771d56b0bfb8 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1865,6 +1865,9 @@ int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control)

 	seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type,
 				gc_control->should_migrate_blocks);
+	if (seg_freed < 0)
+		goto stop;
+
 	total_freed += seg_freed;

 	if (seg_freed == f2fs_usable_segs_in_sec(sbi, segno)) {
-- 
2.40.1