82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/*
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* Copyright (c) 2009 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __LIB_BIO_H
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#define __LIB_BIO_H
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#include <sys/types.h>
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#include <list.h>
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typedef uint32_t bnum_t;
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typedef struct bdev {
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struct list_node node;
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volatile int ref;
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/* info about the block device */
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char *name;
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off_t size;
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size_t block_size;
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bnum_t block_count;
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/* function pointers */
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ssize_t (*read)(struct bdev *, void *buf, off_t offset, size_t len);
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ssize_t (*read_block)(struct bdev *, void *buf, bnum_t block, uint count);
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ssize_t (*write)(struct bdev *, const void *buf, off_t offset, size_t len);
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ssize_t (*write_block)(struct bdev *, const void *buf, bnum_t block, uint count);
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ssize_t (*erase)(struct bdev *, off_t offset, size_t len);
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int (*ioctl)(struct bdev *, int request, void *argp);
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void (*close)(struct bdev *);
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} bdev_t;
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/* user api */
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bdev_t *bio_open(const char *name);
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void bio_close(bdev_t *dev);
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ssize_t bio_read(bdev_t *dev, void *buf, off_t offset, size_t len);
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ssize_t bio_read_block(bdev_t *dev, void *buf, bnum_t block, uint count);
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ssize_t bio_write(bdev_t *dev, const void *buf, off_t offset, size_t len);
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ssize_t bio_write_block(bdev_t *dev, const void *buf, bnum_t block, uint count);
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ssize_t bio_erase(bdev_t *dev, off_t offset, size_t len);
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int bio_ioctl(bdev_t *dev, int request, void *argp);
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/* intialize the block device layer */
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void bio_init(void);
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/* register a block device */
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void bio_register_device(bdev_t *dev);
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void bio_unregister_device(bdev_t *dev);
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/* used during bdev construction */
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void bio_initialize_bdev(bdev_t *dev, const char *name, size_t block_size, bnum_t block_count);
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/* debug stuff */
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void bio_dump_devices(void);
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/* subdevice support */
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status_t bio_publish_subdevice(const char *parent_dev, const char *subdev, bnum_t startblock, size_t len);
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/* memory based block device */
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int create_membdev(const char *name, void *ptr, size_t len);
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#endif
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