f2fs: fix to check page dirty status before writeback

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 <[email protected]> Signed-off-by: Jaegeuk Kim <[email protected]>
radcolor · Dec 3, 2020 · 49f558e · 49f558e
1 parent 17e1bfe
commit 49f558e
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
@@ -1298,6 +1298,12 @@ 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;
 			}