rbd: fix I/O error propagation for reads
When a request returns an error, the driver needs to report the entire extent of the request as completed. Writes already did this, since they always set xferred = length, but reads were skipping that step if an error other than -ENOENT occurred. Instead, rbd would end up passing 0 xferred to blk_end_request(), which would always report needing more data. This resulted in an assert failing when more data was required by the block layer, but all the object requests were done: [ 1868.719077] rbd: obj_request read result -108 xferred 0 [ 1868.719077] [ 1868.719518] end_request: I/O error, dev rbd1, sector 0 [ 1868.719739] [ 1868.719739] Assertion failure in rbd_img_obj_callback() at line 1736: [ 1868.719739] [ 1868.719739] rbd_assert(more ^ (which == img_request->obj_request_count)); Without this assert, reads that hit errors would hang forever, since the block layer considered them incomplete. Fixes: http://tracker.ceph.com/issues/5647 CC: stable@vger.kernel.org # v3.10 Signed-off-by: Josh Durgin <josh.durgin@inktank.com> Reviewed-by: Alex Elder <alex.elder@linaro.org>
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@ -1557,11 +1557,12 @@ rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request)
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obj_request, obj_request->img_request, obj_request->result,
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xferred, length);
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/*
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* ENOENT means a hole in the image. We zero-fill the
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* entire length of the request. A short read also implies
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* zero-fill to the end of the request. Either way we
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* update the xferred count to indicate the whole request
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* was satisfied.
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* ENOENT means a hole in the image. We zero-fill the entire
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* length of the request. A short read also implies zero-fill
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* to the end of the request. An error requires the whole
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* length of the request to be reported finished with an error
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* to the block layer. In each case we update the xferred
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* count to indicate the whole request was satisfied.
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*/
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rbd_assert(obj_request->type != OBJ_REQUEST_NODATA);
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if (obj_request->result == -ENOENT) {
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@ -1570,14 +1571,13 @@ rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request)
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else
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zero_pages(obj_request->pages, 0, length);
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obj_request->result = 0;
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obj_request->xferred = length;
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} else if (xferred < length && !obj_request->result) {
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if (obj_request->type == OBJ_REQUEST_BIO)
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zero_bio_chain(obj_request->bio_list, xferred);
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else
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zero_pages(obj_request->pages, xferred, length);
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obj_request->xferred = length;
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}
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obj_request->xferred = length;
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obj_request_done_set(obj_request);
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}
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