ext4: call ext4_error_inode() if jbd2_journal_dirty_metadata() fails

commit ae1495b12df1897d4f42842a7aa7276d920f6290 upstream.

While it's true that errors can only happen if there is a bug in
jbd2_journal_dirty_metadata(), if a bug does happen, we need to halt
the kernel or remount the file system read-only in order to avoid
further data loss.  The ext4_journal_abort_handle() function doesn't
do any of this, and while it's likely that this call (since it doesn't
adjust refcounts) will likely result in the file system eventually
deadlocking since the current transaction will never be able to close,
it's much cleaner to call let ext4's error handling system deal with
this situation.

There's a separate bug here which is that if certain jbd2 errors
errors occur and file system is mounted errors=continue, the file
system will probably eventually end grind to a halt as described
above.  But things have been this way in a long time, and usually when
we have these sorts of errors it's pretty much a disaster --- and
that's why the jbd2 layer aggressively retries memory allocations,
which is the most likely cause of these jbd2 errors.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
[bwh: Backported to 3.2: drop logging of missing transaction debug data]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index d0b8f9838e811e0a36562541208bcb8d90f4f6f7..9995b990eebe709ce0bc7391948b4f34a3a0c181 100644 (file)
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -113,6 +113,10 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
                if (WARN_ON_ONCE(err)) {
                        ext4_journal_abort_handle(where, line, __func__, bh,
                                                  handle, err);
+                       ext4_error_inode(inode, where, line,
+                                        bh->b_blocknr,
+                                        "journal_dirty_metadata failed: "
+                                        "errcode %d", err);
                }
        } else {
                if (inode)