[RFC PATCH v4 3/8] jbd2: don't abort the journal when freeing buffers

From: Zhang Yi <yi.zhang@huawei.com>
To: <linux-ext4@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
	<jack@suse.cz>, <tytso@mit.edu>
Cc: <adilger.kernel@dilger.ca>, <david@fromorbit.com>,
	<hch@infradead.org>, <yi.zhang@huawei.com>
Subject: [RFC PATCH v4 3/8] jbd2: don't abort the journal when freeing buffers
Date: Thu, 10 Jun 2021 19:24:35 +0800	[thread overview]
Message-ID: <20210610112440.3438139-4-yi.zhang@huawei.com> (raw)
In-Reply-To: <20210610112440.3438139-1-yi.zhang@huawei.com>

Now that we can be sure the journal is aborted once a buffer has failed
to be written back to disk, we can remove the journal abort logic in
jbd2_journal_try_to_free_buffers() which was introduced in
commit c044f3d8360d ("jbd2: abort journal if free a async write error
metadata buffer"), because it may cost and propably is not safe.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/jbd2/transaction.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index e8fc45fd751f..8804e126805f 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -2123,7 +2123,6 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
 {
 	struct buffer_head *head;
 	struct buffer_head *bh;
-	bool has_write_io_error = false;
 	int ret = 0;
 
 	J_ASSERT(PageLocked(page));
@@ -2148,26 +2147,10 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
 		jbd2_journal_put_journal_head(jh);
 		if (buffer_jbd(bh))
 			goto busy;
-
-		/*
-		 * If we free a metadata buffer which has been failed to
-		 * write out, the jbd2 checkpoint procedure will not detect
-		 * this failure and may lead to filesystem inconsistency
-		 * after cleanup journal tail.
-		 */
-		if (buffer_write_io_error(bh)) {
-			pr_err("JBD2: Error while async write back metadata bh %llu.",
-			       (unsigned long long)bh->b_blocknr);
-			has_write_io_error = true;
-		}
 	} while ((bh = bh->b_this_page) != head);
 
 	ret = try_to_free_buffers(page);
-
 busy:
-	if (has_write_io_error)
-		jbd2_journal_abort(journal, -EIO);
-
 	return ret;
 }
 
-- 
2.31.1

