[PATCH] f2fs: fix to check page dirty status before writeback

From: Chao Yu
Date: Fri Jun 19 2020 - 05:14:41 EST


In f2fs_write_raw_pages(), we need to check page dirty status before
writeback, because there could be a racer (e.g. reclaimer) helps
writebacking the dirty page.

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
fs/f2fs/compress.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 5643aa2b8377..ce5645b5c833 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1322,6 +1322,12 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
congestion_wait(BLK_RW_ASYNC,
DEFAULT_IO_TIMEOUT);
lock_page(cc->rpages[i]);
+
+ if (!PageDirty(cc->rpages[i])) {
+ unlock_page(cc->rpages[i]);
+ continue;
+ }
+
clear_page_dirty_for_io(cc->rpages[i]);
goto retry_write;
}
--
2.26.2