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rbd: end I/O the entire obj_request on error

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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>
Cc: stable@vger.kernel.org # 3.10+
Reported-by: Shawn Edwards <lesser.evil@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2015-04-25 15:56:15 +03:00 committed by Sage Weil
parent b787f68c36
commit 082a75dad8
1 changed files with 5 additions and 0 deletions
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5
drivers/block/rbd.c
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@ -2264,6 +2264,11 @@ 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 */