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>
81 lines
2.3 KiB
C
81 lines
2.3 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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#ifndef UTILS_IO_H_
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#define UTILS_IO_H_
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#include "../ocf_request.h"
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/**
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* Checks if 2 IOs are overlapping.
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* @param start1 start of first range (inclusive)
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* @param end1 end of first range (exclusive)
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* @param start2 start of second range (inclusive)
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* @param end2 end of second range (exclusive)
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* @return 0 in case overlap is not detected, otherwise 1
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*/
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static inline int ocf_io_range_overlaps(uint32_t start1, uint32_t end1,
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uint32_t start2, uint32_t end2)
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{
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if (start2 <= start1 && end2 >= start1)
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return 1;
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if (start2 >= start1 && end1 >= start2)
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return 1;
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return 0;
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}
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/**
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* Checks if 2 IOs are overlapping.
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* @param start1 start of first range (inclusive)
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* @param count1 no of bytes, cachelines (etc) for first range
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* @param start2 start of second range (inclusive)
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* @param count2 no of bytes, cachelines (etc) for second range
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* @return 0 in case overlap is not detected, otherwise 1
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*/
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static inline int ocf_io_overlaps(uint32_t start1, uint32_t count1,
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uint32_t start2, uint32_t count2)
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{
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return ocf_io_range_overlaps(start1, start1 + count1 - 1, start2,
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start2 + count2 - 1);
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}
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typedef void (*ocf_submit_end_t)(void *priv, int error);
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void ocf_submit_volume_flush(ocf_volume_t volume,
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ocf_submit_end_t cmpl, void *priv);
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void ocf_submit_volume_discard(ocf_volume_t volume, uint64_t addr,
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uint64_t length, ocf_submit_end_t cmpl, void *priv);
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void ocf_submit_write_zeros(ocf_volume_t volume, uint64_t addr,
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uint64_t length, ocf_submit_end_t cmpl, void *priv);
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void ocf_submit_cache_page(ocf_cache_t cache, uint64_t addr, int dir,
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void *buffer, ocf_submit_end_t cmpl, void *priv);
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void ocf_submit_volume_req(ocf_volume_t volume, struct ocf_request *req,
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ocf_req_end_t callback);
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void ocf_submit_cache_reqs(struct ocf_cache *cache,
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struct ocf_request *req, int dir, uint64_t offset,
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uint64_t size, unsigned int reqs, ocf_req_end_t callback);
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static inline struct ocf_io *ocf_new_cache_io(struct ocf_cache *cache)
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{
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return ocf_volume_new_io(&cache->device->volume);
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}
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static inline struct ocf_io *ocf_new_core_io(struct ocf_cache *cache,
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ocf_core_id_t core_id)
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{
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ENV_BUG_ON(core_id >= OCF_CORE_MAX);
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return ocf_volume_new_io(&cache->core[core_id].volume);
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}
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#endif /* UTILS_IO_H_ */
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