ab2eff0798
If the bs_dev was opened read-write, continue to take a read-many-write-one claim. If it was opened read-only, take a read-many-write-none claim. Signed-off-by: Mike Gerdts <mgerdts@nvidia.com> Change-Id: I25d977c6961f962423899fb891ec912cd847930a Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16282 Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (C) 2017 Intel Corporation.
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* All rights reserved.
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* Copyright (c) 2022-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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*/
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/** \file
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* Helper library to use spdk_bdev as the backing device for a blobstore
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*/
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#ifndef SPDK_BLOB_BDEV_H
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#define SPDK_BLOB_BDEV_H
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#include "spdk/stdinc.h"
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#include "spdk/bdev.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct spdk_bs_dev;
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struct spdk_bdev;
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struct spdk_bdev_module;
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struct spdk_bdev_bs_dev_opts {
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/**
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* The size of this structure according to the caller of this library is used for ABI
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* compatibility. The library uses this field to know how many fields in this structure are
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* valid. And the library will populate any remaining fields with default values.
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* New added fields should be put at the end of the struct.
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*/
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size_t opts_size;
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};
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SPDK_STATIC_ASSERT(sizeof(struct spdk_bdev_bs_dev_opts) == 8, "Incorrect size");
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/**
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* Create a blobstore block device from a bdev.
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*
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* \param bdev_name Name of the bdev to use.
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* \param event_cb Called when the bdev triggers asynchronous event.
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* \param event_ctx Argument passed to function event_cb.
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* \param bs_dev Output parameter for a pointer to the blobstore block device.
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*
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* \return 0 if operation is successful, or suitable errno value otherwise.
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*/
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int spdk_bdev_create_bs_dev_ext(const char *bdev_name, spdk_bdev_event_cb_t event_cb,
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void *event_ctx, struct spdk_bs_dev **bs_dev);
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/**
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* Create a blobstore block device from a bdev.
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*
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* \param bdev_name The bdev to use.
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* \param write If true, open device read-write, else open read-only.
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* \param opts Additonal options; none currently supported.
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* \param opts_size Size of structure referenced by opts.
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* \param event_cb Called when the bdev triggers asynchronous event.
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* \param event_ctx Argument passed to function event_cb.
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* \param bs_dev Output parameter for a pointer to the blobstore block device.
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* \return 0 if operation is successful, or suitable errno value otherwise.
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*/
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int spdk_bdev_create_bs_dev(const char *bdev_name, bool write,
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struct spdk_bdev_bs_dev_opts *opts, size_t opts_size,
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spdk_bdev_event_cb_t event_cb, void *event_ctx,
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struct spdk_bs_dev **bs_dev);
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/**
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* Claim the bdev module for the given blobstore.
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*
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* If bs_dev was opened read-write using spdk_bdev_create_bs_dev_ext(), a read-write-once claim is
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* taken. If bs_dev was opened read-only using spdk_bdev_create_bs_dev_ro(), a read-only-many claim
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* is taken.
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*
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* \param bs_dev Blobstore block device.
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* \param module Bdev module to claim.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_bs_bdev_claim(struct spdk_bs_dev *bs_dev, struct spdk_bdev_module *module);
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#ifdef __cplusplus
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}
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#endif
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#endif
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