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From: "zhangyi (F)" <yi.zhang@huawei.com>
To: <linux-ext4@vger.kernel.org>, <tytso@mit.edu>, <jack@suse.cz>
Cc: <adilger.kernel@dilger.ca>, <zhangxiaoxu5@huawei.com>,
	<yi.zhang@huawei.com>, <linux-fsdevel@vger.kernel.org>
Subject: [PATCH v3 4/5] jbd2: abort journal if free a async write error metadata buffer
Date: Sat, 20 Jun 2020 10:54:26 +0800	[thread overview]
Message-ID: <20200620025427.1756360-5-yi.zhang@huawei.com> (raw)
In-Reply-To: <20200620025427.1756360-1-yi.zhang@huawei.com>

If we free a metadata buffer which has been failed to async write out
in the background, the jbd2 checkpoint procedure will not detect this
failure in jbd2_log_do_checkpoint(), so it may lead to filesystem
inconsistency after cleanup journal tail. This patch abort the journal
if free a buffer has write_io_error flag to prevent potential further
inconsistency.

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
---
 fs/jbd2/transaction.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index e91aad3637a2..a4932e8dcb65 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -2117,6 +2117,7 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
 {
 	struct buffer_head *head;
 	struct buffer_head *bh;
+	bool has_write_io_error = false;
 	int ret = 0;
 
 	J_ASSERT(PageLocked(page));
@@ -2141,11 +2142,26 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
 		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;
 }
 
-- 
2.25.4


  parent reply	other threads:[~2020-06-20  2:53 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-20  2:54 [PATCH v3 0/5] ext4: fix inconsistency since async write metadata buffer error zhangyi (F)
2020-06-20  2:54 ` [PATCH v3 1/5] ext4: abort the filesystem if failed to async write metadata buffer zhangyi (F)
2020-08-07 17:49   ` tytso
2020-06-20  2:54 ` [PATCH v3 2/5] ext4: remove ext4_buffer_uptodate() zhangyi (F)
2020-08-07 17:53   ` tytso
2020-06-20  2:54 ` [PATCH v3 3/5] ext4: remove write io error check before read inode block zhangyi (F)
2020-06-20  2:54 ` zhangyi (F) [this message]
2020-08-07 17:59   ` [PATCH v3 4/5] jbd2: abort journal if free a async write error metadata buffer tytso
2020-06-20  2:54 ` [PATCH v3 5/5] jbd2: remove unused parameter in jbd2_journal_try_to_free_buffers() zhangyi (F)
2020-07-13  1:40 ` [PATCH v3 0/5] ext4: fix inconsistency since async write metadata buffer error zhangyi (F)

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