From: zhangyi (F) yi.zhang@huawei.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@huawei.com Link: https://lore.kernel.org/r/20200620025427.1756360-5-yi.zhang@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.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; }