82e8c55f4a
Write-only cache mode is similar to writeback, however read operations do not promote data to cache. Reads are mostly serviced by the core device, only dirty sectors are fetched from the cache. Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
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* Copyright(c) 2012-2018 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause-Clear
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*/
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#include "ocf/ocf.h"
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#include "../ocf_cache_priv.h"
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#include "engine_common.h"
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#include "cache_engine.h"
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#include "engine_ops.h"
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#include "../ocf_request.h"
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#include "../utils/utils_io.h"
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#define OCF_ENGINE_DEBUG_IO_NAME "ops"
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#include "engine_debug.h"
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static void _ocf_engine_ops_complete(struct ocf_request *req, int error)
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{
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if (error)
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req->error |= error;
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if (env_atomic_dec_return(&req->req_remaining))
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return;
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OCF_DEBUG_RQ(req, "Completion");
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if (req->error) {
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/* An error occured */
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ocf_engine_error(req, false, "Core operation failure");
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}
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/* Complete requests - both to cache and to core*/
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req->complete(req, req->error);
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/* Release OCF request */
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ocf_req_put(req);
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}
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int ocf_engine_ops(struct ocf_request *req)
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{
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struct ocf_cache *cache = req->cache;
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OCF_DEBUG_TRACE(req->cache);
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/* Get OCF request - increase reference counter */
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ocf_req_get(req);
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/* IO to the core device and to the cache device */
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env_atomic_set(&req->req_remaining, 2);
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/* Submit operation into core device */
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ocf_submit_volume_req(&req->core->volume, req,
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_ocf_engine_ops_complete);
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ocf_submit_cache_reqs(cache, req, req->rw, 0, req->byte_length,
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1, _ocf_engine_ops_complete);
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/* Put OCF request - decrease reference counter */
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ocf_req_put(req);
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return 0;
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}
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