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Date: Mon, 24 Aug 2020 12:34:08 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: "zhangyi (F)" <yi.zhang@...wei.com>, Theodore Ts'o <tytso@....edu>, Sasha Levin <sashal@...nel.org>, linux-ext4@...r.kernel.org Subject: [PATCH AUTOSEL 5.8 08/63] jbd2: abort journal if free a async write error metadata buffer From: "zhangyi (F)" <yi.zhang@...wei.com> [ Upstream commit c044f3d8360d2ecf831ba2cc9f08cf9fb2c699fb ] 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@...wei.com> Link: https://lore.kernel.org/r/20200620025427.1756360-5-yi.zhang@huawei.com Signed-off-by: Theodore Ts'o <tytso@....edu> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/jbd2/transaction.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index e65e0aca28261..6250c9faa4cbe 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -2120,6 +2120,7 @@ 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)); @@ -2144,11 +2145,26 @@ 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; } -- 2.25.1
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