linux-kernel - [PATCH] f2fs: f2fs_get_meta_page

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Date:   Fri,  2 Oct 2020 14:32:26 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: f2fs_get_meta_page_nofail should not be failed

Otherwise, f2fs can break the the consistency.
(e.g., BUG_ON in f2fs_get_sum_page)

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/checkpoint.c | 9 +++------
 fs/f2fs/f2fs.h       | 2 --
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f18386d30f031..7bb3a741a8f16 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -110,15 +110,12 @@ struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index)
 {
 	struct page *page;
-	int count = 0;
-
 retry:
 	page = __get_meta_page(sbi, index, true);
 	if (IS_ERR(page)) {
-		if (PTR_ERR(page) == -EIO &&
-				++count <= DEFAULT_RETRY_IO_COUNT)
-			goto retry;
-		f2fs_stop_checkpoint(sbi, false);
+		f2fs_flush_merged_writes(sbi);
+		congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+		goto retry;
 	}
 	return page;
 }
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9d58fd5dae139..d905edb42c327 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -595,8 +595,6 @@ enum {
 					 */
 };
 
-#define DEFAULT_RETRY_IO_COUNT	8	/* maximum retry read IO count */
-
 /* congestion wait timeout value, default: 20ms */
 #define	DEFAULT_IO_TIMEOUT	(msecs_to_jiffies(20))
 
-- 
2.28.0.806.g8561365e88-goog