rbd: end I/O the entire obj_request on error

commit 082a75dad84d79d1c15ea9e50f31cb4bb4fa7fd6 upstream.

When we end I/O struct request with error, we need to pass
obj_request->length as @nr_bytes so that the entire obj_request worth
of bytes is completed.  Otherwise block layer ends up confused and we
trip on

    rbd_assert(more ^ (which == img_request->obj_request_count));

in rbd_img_obj_callback() due to more being true no matter what.  We
already do it in most cases but we are missing some, in particular
those where we don't even get a chance to submit any obj_requests, due
to an early -ENOMEM for example.

A number of obj_request->xferred assignments seem to be redundant but
I haven't touched any of obj_request->xferred stuff to keep this small
and isolated.

Cc: Alex Elder <elder@linaro.org>
Reported-by: Shawn Edwards <lesser.evil@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 7e3f45105f1189b13c87f7fafa8e35da127327e2..dd297099c99dd1ee93980934652d7498666a4b10 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2115,6 +2115,11 @@ static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request)
                        result, xferred);
                if (!img_request->result)
                        img_request->result = result;
+               /*
+                * Need to end I/O on the entire obj_request worth of
+                * bytes in case of error.
+                */
+               xferred = obj_request->length;
        }
 
        /* Image object requests don't own their page array */