dm mpath: merge do_end_io_bio into multipath_end_io_bio

This simplifies the code and especially the error passing a bit and
will help with the next patch.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 3df056b..6d5ebb7 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1510,24 +1510,24 @@ static int multipath_end_io(struct dm_target *ti, struct request *clone,
        return r;
 }
 
-static int do_end_io_bio(struct multipath *m, struct bio *clone,
-                        int error, struct dm_mpath_io *mpio)
+static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone, int error)
 {
+       struct multipath *m = ti->private;
+       struct dm_mpath_io *mpio = get_mpio_from_bio(clone);
+       struct pgpath *pgpath = mpio->pgpath;
        unsigned long flags;
 
-       if (!error)
-               return 0;       /* I/O complete */
-
-       if (noretry_error(error))
-               return error;
+       if (!error || noretry_error(error))
+               goto done;
 
-       if (mpio->pgpath)
-               fail_path(mpio->pgpath);
+       if (pgpath)
+               fail_path(pgpath);
 
        if (atomic_read(&m->nr_valid_paths) == 0 &&
            !test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) {
                dm_report_EIO(m);
-               return -EIO;
+               error = -EIO;
+               goto done;
        }
 
        /* Queue for the daemon to resubmit */
@@ -1539,28 +1539,16 @@ static int do_end_io_bio(struct multipath *m, struct bio *clone,
        if (!test_bit(MPATHF_QUEUE_IO, &m->flags))
                queue_work(kmultipathd, &m->process_queued_bios);
 
-       return DM_ENDIO_INCOMPLETE;
-}
-
-static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone, int error)
-{
-       struct multipath *m = ti->private;
-       struct dm_mpath_io *mpio = get_mpio_from_bio(clone);
-       struct pgpath *pgpath;
-       struct path_selector *ps;
-       int r;
-
-       BUG_ON(!mpio);
-
-       r = do_end_io_bio(m, clone, error, mpio);
-       pgpath = mpio->pgpath;
+       error = DM_ENDIO_INCOMPLETE;
+done:
        if (pgpath) {
-               ps = &pgpath->pg->ps;
+               struct path_selector *ps = &pgpath->pg->ps;
+
                if (ps->type->end_io)
                        ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
        }
 
-       return r;
+       return error;
 }
 
 /*