jbd2: don't BUG but return ENOSPC if a handle runs out of space

If a handle runs out of space, we currently stop the kernel with a BUG
in jbd2_journal_dirty_metadata().  This makes it hard to figure out
what might be going on.  So return an error of ENOSPC, so we can let
the file system layer figure out what is going on, to make it more
likely we can get useful debugging information).  This should make it
easier to debug problems such as the one which was reported by:

    https://bugzilla.kernel.org/show_bug.cgi?id=44731

The only two callers of this function are ext4_handle_dirty_metadata()
and ocfs2_journal_dirty().  The ocfs2 function will trigger a
BUG_ON(), which means there will be no change in behavior.  The ext4
function will call ext4_error_inode() which will print the useful
debugging information and then handle the situation using ext4's error
handling mechanisms (i.e., which might mean halting the kernel or
remounting the file system read-only).

Also, since both file systems already call WARN_ON(), drop the WARN_ON
from jbd2_journal_dirty_metadata() to avoid two stack traces from
being displayed.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: ocfs2-devel@oss.oracle.com
Acked-by: Joel Becker <jlbec@evilplan.org>

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 7aa9a32573bba885d166e484c367bffc06bcd9e2..b0b74e58697b52a0eeedffdc001b988b9ea4f4a9 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1290,7 +1290,10 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
                 * once a transaction -bzzz
                 */
                jh->b_modified = 1;
-               J_ASSERT_JH(jh, handle->h_buffer_credits > 0);
+               if (handle->h_buffer_credits <= 0) {
+                       ret = -ENOSPC;
+                       goto out_unlock_bh;
+               }
                handle->h_buffer_credits--;
        }
 
@@ -1373,7 +1376,6 @@ out_unlock_bh:
        jbd2_journal_put_journal_head(jh);
 out:
        JBUFFER_TRACE(jh, "exit");
-       WARN_ON(ret);   /* All errors are bugs, so dump the stack */
        return ret;
 }