[PATCH 5.5 086/399] ext4, jbd2: ensure panic when aborting with zero errno

Greg Kroah-Hartman
2020-02-21T07:47:11Z

From: zhangyi (F) <yi.zhang@huawei.com>

[ Upstream commit 51f57b01e4a3c7d7bdceffd84de35144e8c538e7 ]

JBD2_REC_ERR flag used to indicate the errno has been updated when jbd2
aborted, and then __ext4_abort() and ext4_handle_error() can invoke
panic if ERRORS_PANIC is specified. But if the journal has been aborted
with zero errno, jbd2_journal_abort() didn't set this flag so we can
no longer panic. Fix this by always record the proper errno in the
journal superblock.

Fixes: 4327ba52afd03 ("ext4, jbd2: ensure entering into panic after recording an error in superblock")
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191204124614.45424-3-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/jbd2/checkpoint.c | 2 +-
fs/jbd2/journal.c | 15 ++++-----------
2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 8fff6677a5da4..96bf33986d030 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -164,7 +164,7 @@ void __jbd2_log_wait_for_space(journal_t *journal)
"journal space in %s\n", __func__,
journal->j_devname);
WARN_ON(1);
- jbd2_journal_abort(journal, 0);
+ jbd2_journal_abort(journal, -EIO);
}
write_lock(&journal->j_state_lock);
} else {
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 6847b18455068..8479e84159675 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2156,12 +2156,10 @@ static void __journal_abort_soft (journal_t *journal, int errno)

__jbd2_journal_abort_hard(journal);

- if (errno) {
- jbd2_journal_update_sb_errno(journal);
- write_lock(&journal->j_state_lock);
- journal->j_flags |= JBD2_REC_ERR;
- write_unlock(&journal->j_state_lock);
- }
+ jbd2_journal_update_sb_errno(journal);
+ write_lock(&journal->j_state_lock);
+ journal->j_flags |= JBD2_REC_ERR;
+ write_unlock(&journal->j_state_lock);
}

/**
@@ -2203,11 +2201,6 @@ static void __journal_abort_soft (journal_t *journal, int errno)
* failure to disk. ext3_error, for example, now uses this
* functionality.
*
- * Errors which originate from within the journaling layer will NOT
- * supply an errno; a null errno implies that absolutely no further
- * writes are done to the journal (unless there are any already in
- * progress).
- *
*/

void jbd2_journal_abort(journal_t *journal, int errno)
--
2.20.1