108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* Copyright(c) 2012-2022 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __CASDISK_EXP_OBJ_H__
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#define __CASDISK_EXP_OBJ_H__
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#include <linux/fs.h>
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struct cas_disk;
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struct cas_exp_obj_ops {
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/**
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* @brief Set geometry of exported object (top) block device.
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* Could be NULL.
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*/
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int (*set_geometry)(struct cas_disk *dsk, void *private);
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/**
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* @brief submit_bio of exported object (top) block device.
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*
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*/
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void (*submit_bio)(struct cas_disk *dsk,
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struct bio *bio, void *private);
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};
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struct cas_exp_obj {
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struct gendisk *gd;
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struct request_queue *queue;
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struct block_device *locked_bd;
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struct module *owner;
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struct cas_exp_obj_ops *ops;
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const char *dev_name;
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struct mutex openers_lock;
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unsigned int openers;
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bool claimed;
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int gd_flags;
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int gd_minors;
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struct blk_mq_tag_set tag_set;
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atomic_t pt_ios;
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atomic_t *pending_rqs;
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void *private;
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};
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int __init cas_init_exp_objs(void);
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void cas_deinit_exp_objs(void);
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void cas_exp_obj_cleanup(struct cas_disk *dsk);
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/**
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* @brief Create exported object (top device)
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* @param dsk Pointer to cas_disk structure representing a block device
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* @param dev_name Name of exported object (top device)
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* @param owner Pointer to cas module
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* @param ops Pointer to structure with callback functions
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* @param priv Private data
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* @return 0 if success, errno if failure
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*/
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int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
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struct module *owner, struct cas_exp_obj_ops *ops, void *priv);
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/**
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* @brief Get request queue of exported object (top) block device
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* @param dsk Pointer to cas_disk structure representing a block device
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* @return Pointer to reqest_queue structure of top block device
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*/
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struct request_queue *cas_exp_obj_get_queue(struct cas_disk *dsk);
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/**
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* @brief Get gendisk structure of exported object (top) block device
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* @param dsk Pointer to cas_disk structure representing a block device
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* @return Pointer to gendisk structure of top block device
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*/
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struct gendisk *cas_exp_obj_get_gendisk(struct cas_disk *dsk);
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/**
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* @brief Lock exported object
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* @param dsk Pointer to cas_disk structure representing a block device
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* @return 0 if success, errno if failure
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*/
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int cas_exp_obj_lock(struct cas_disk *dsk);
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/**
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* @brief Unlock exported object
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* @param dsk Pointer to cas_disk structure representing a block device
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* @return 0 if success, errno if failure
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*/
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int cas_exp_obj_unlock(struct cas_disk *dsk);
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/**
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* @brief Destroy exported object
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* @param dsk Pointer to cas_disk structure representing a block device
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* @return 0 if success, errno if failure
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*/
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int cas_exp_obj_destroy(struct cas_disk *dsk);
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#endif
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