WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libblock/libblock.h


/*
 * Copyright (c) 2008 Jakub Jermar
 * Copyright (c) 2008 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup libblock
 * @{
 */
/**
 * @file
 */
 
#ifndef LIBBLOCK_LIBBLOCK_H_
#define LIBBLOCK_LIBBLOCK_H_ 
 
#include <stdint.h>
#include "../../srv/vfs/vfs.h"
#include <futex.h>
#include <rwlock.h>
#include <libadt/hash_table.h>
#include <libadt/list.h>
 
typedef struct block {
    /** Futex protecting the reference count. */
    futex_t lock;
    /** Number of references to the block_t structure. */
    unsigned refcnt;
    /** If true, the block needs to be written back to the block device. */
    bool dirty;
    /** Readers / Writer lock protecting the contents of the block. */
    rwlock_t contents_lock;
    /** Handle of the device where the block resides. */
    dev_handle_t dev_handle;
    /** Block offset on the block device. Counted in 'size'-byte blocks. */
    off_t boff;
    /** Size of the block. */
    size_t size;
    /** Link for placing the block into the free block list. */
    link_t free_link;
    /** Link for placing the block into the block hash table. */
    link_t hash_link;
    /** Buffer with the block data. */
    void *data;
} block_t;
 
extern int block_init(dev_handle_t, size_t);
extern void block_fini(dev_handle_t);
 
extern int block_bb_read(dev_handle_t, off_t, size_t);
extern void *block_bb_get(dev_handle_t);
 
extern int block_cache_init(dev_handle_t, size_t, unsigned);
 
extern block_t *block_get(dev_handle_t, off_t);
extern void block_put(block_t *);
 
extern int block_read(int, off_t *, size_t *, off_t *, void *, size_t, size_t);
 
#endif
 
/** @}
 */
 
 

Rev 3535	Rev 3561
1	/*	1	/*
2	* Copyright (c) 2008 Jakub Jermar	2	* Copyright (c) 2008 Jakub Jermar
3	* Copyright (c) 2008 Martin Decky	3	* Copyright (c) 2008 Martin Decky
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	14	* documentation and/or other materials provided with the distribution.
15	* - The name of the author may not be used to endorse or promote products	15	* - The name of the author may not be used to endorse or promote products
16	* derived from this software without specific prior written permission.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	/** @addtogroup libblock	30	/** @addtogroup libblock
31	* @{	31	* @{
32	*/	32	*/
33	/**	33	/**
34	* @file	34	* @file
35	*/	35	*/
36		36
37	#ifndef LIBBLOCK_LIBBLOCK_H_	37	#ifndef LIBBLOCK_LIBBLOCK_H_
38	#define LIBBLOCK_LIBBLOCK_H_	38	#define LIBBLOCK_LIBBLOCK_H_
39		39
40	#include <stdint.h>	40	#include <stdint.h>
41	#include "../../srv/vfs/vfs.h"	41	#include "../../srv/vfs/vfs.h"
42	#include <futex.h>	42	#include <futex.h>
43	#include <rwlock.h>	43	#include <rwlock.h>
44	#include <libadt/hash_table.h>	44	#include <libadt/hash_table.h>
45	#include <libadt/list.h>	45	#include <libadt/list.h>
46		46
47	typedef struct block {	47	typedef struct block {
48	/** Futex protecting the reference count. */	48	/** Futex protecting the reference count. */
49	futex_t lock;	49	futex_t lock;
50	/** Number of references to the block_t structure. */	50	/** Number of references to the block_t structure. */
51	unsigned refcnt;	51	unsigned refcnt;
52	/** If true, the block needs to be written back to the block device. */	52	/** If true, the block needs to be written back to the block device. */
53	bool dirty;	53	bool dirty;
54	/** Readers / Writer lock protecting the contents of the block. */	54	/** Readers / Writer lock protecting the contents of the block. */
55	rwlock_t contents_lock;	55	rwlock_t contents_lock;
56	/** Handle of the device where the block resides. */	56	/** Handle of the device where the block resides. */
57	dev_handle_t dev_handle;	57	dev_handle_t dev_handle;
58	/** Block offset on the block device. Counted in 'size'-byte blocks. */	58	/** Block offset on the block device. Counted in 'size'-byte blocks. */
59	off_t boff;	59	off_t boff;
60	/** Size of the block. */	60	/** Size of the block. */
61	size_t size;	61	size_t size;
62	/** Link for placing the block into the free block list. */	62	/** Link for placing the block into the free block list. */
63	link_t free_link;	63	link_t free_link;
64	/** Link for placing the block into the block hash table. */	64	/** Link for placing the block into the block hash table. */
65	link_t hash_link;	65	link_t hash_link;
66	/** Buffer with the block data. */	66	/** Buffer with the block data. */
67	void *data;	67	void *data;
68	} block_t;	68	} block_t;
69		69
70	extern int block_init(dev_handle_t, size_t, off_t, size_t);	70	extern int block_init(dev_handle_t, size_t);
71	extern void block_fini(dev_handle_t);	71	extern void block_fini(dev_handle_t);
-		72
-		73	extern int block_bb_read(dev_handle_t, off_t, size_t);
72	extern void *block_bb_get(dev_handle_t);	74	extern void *block_bb_get(dev_handle_t);
73		75
-		76	extern int block_cache_init(dev_handle_t, size_t, unsigned);
-		77
74	extern block_t *block_get(dev_handle_t, off_t, size_t);	78	extern block_t *block_get(dev_handle_t, off_t);
75	extern void block_put(block_t *);	79	extern void block_put(block_t *);
76		80
77	extern bool block_read(int, off_t , size_t , off_t , void , size_t, size_t);	81	extern int block_read(int, off_t , size_t , off_t , void , size_t, size_t);
78		82
79	#endif	83	#endif
80		84
81	/** @}	85	/** @}
82	*/	86	*/
83		87
84		88

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(root)/branches/dynload/uspace/lib/libblock/libblock.h – Rev 3535 → 3561