| 1 | /*
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| 2 | * Copyright (c) 2008 Jakub Jermar
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| 3 | * Copyright (c) 2008 Martin Decky
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| 4 | * Copyright (c) 2011 Martin Sucha
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | *
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| 11 | * - Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * - Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * - The name of the author may not be used to endorse or promote products
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| 17 | * derived from this software without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | /** @addtogroup libblock
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| 32 | * @{
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| 33 | */
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| 34 | /**
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| 35 | * @file
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| 36 | */
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| 37 |
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| 38 | #ifndef LIBBLOCK_LIBBLOCK_H_
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| 39 | #define LIBBLOCK_LIBBLOCK_H_
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| 40 |
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| 41 | #include <stdint.h>
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| 42 | #include <async.h>
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| 43 | #include "../../srv/vfs/vfs.h"
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| 44 | #include <fibril_synch.h>
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| 45 | #include <adt/hash_table.h>
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| 46 | #include <adt/list.h>
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| 47 |
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| 48 | /*
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| 49 | * Flags that can be used with block_get().
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| 50 | */
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| 51 |
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| 52 | /**
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| 53 | * This macro is a symbolic value for situations where no special flags are
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| 54 | * needed.
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| 55 | */
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| 56 | #define BLOCK_FLAGS_NONE 0
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| 57 |
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| 58 | /**
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| 59 | * When the client of block_get() intends to overwrite the current contents of
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| 60 | * the block, this flag is used to avoid the unnecessary read.
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| 61 | */
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| 62 | #define BLOCK_FLAGS_NOREAD 1
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| 63 |
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| 64 | typedef struct block {
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| 65 | /** Mutex protecting the reference count. */
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| 66 | fibril_mutex_t lock;
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| 67 | /** Number of references to the block_t structure. */
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| 68 | unsigned refcnt;
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| 69 | /** If true, the block needs to be written back to the block device. */
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| 70 | bool dirty;
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| 71 | /** If true, the blcok does not contain valid data. */
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| 72 | bool toxic;
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| 73 | /** Readers / Writer lock protecting the contents of the block. */
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| 74 | fibril_rwlock_t contents_lock;
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| 75 | /** Service ID of service providing the block device. */
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| 76 | service_id_t service_id;
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| 77 | /** Logical block address */
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| 78 | aoff64_t lba;
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| 79 | /** Physical block address */
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| 80 | aoff64_t pba;
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| 81 | /** Size of the block. */
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| 82 | size_t size;
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| 83 | /** Link for placing the block into the free block list. */
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| 84 | link_t free_link;
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| 85 | /** Link for placing the block into the block hash table. */
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| 86 | link_t hash_link;
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| 87 | /** Buffer with the block data. */
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| 88 | void *data;
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| 89 | } block_t;
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| 90 |
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| 91 | /** Caching mode */
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| 92 | enum cache_mode {
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| 93 | /** Write-Through */
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| 94 | CACHE_MODE_WT,
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| 95 | /** Write-Back */
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| 96 | CACHE_MODE_WB
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| 97 | };
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| 98 |
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| 99 | extern int block_init(exch_mgmt_t, service_id_t, size_t);
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| 100 | extern void block_fini(service_id_t);
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| 101 |
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| 102 | extern int block_bb_read(service_id_t, aoff64_t);
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| 103 | extern void *block_bb_get(service_id_t);
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| 104 |
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| 105 | extern int block_cache_init(service_id_t, size_t, unsigned, enum cache_mode);
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| 106 | extern int block_cache_fini(service_id_t);
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| 107 |
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| 108 | extern int block_get(block_t **, service_id_t, aoff64_t, int);
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| 109 | extern int block_put(block_t *);
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| 110 |
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| 111 | extern int block_seqread(service_id_t, size_t *, size_t *, aoff64_t *, void *,
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| 112 | size_t);
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| 113 |
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| 114 | extern int block_get_bsize(service_id_t, size_t *);
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| 115 | extern int block_get_nblocks(service_id_t, aoff64_t *);
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| 116 | extern int block_read_direct(service_id_t, aoff64_t, size_t, void *);
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| 117 | extern int block_read_bytes_direct(service_id_t, aoff64_t, size_t, void *);
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| 118 | extern int block_write_direct(service_id_t, aoff64_t, size_t, const void *);
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| 119 |
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| 120 | #endif
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| 121 |
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| 122 | /** @}
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| 123 | */
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| 124 |
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