Subversion Repositories HelenOS

Rev

Rev 4537 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 4537 Rev 4668
Line 37... Line 37...
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>
 - 
 
43 
#include <rwlock.h>
 42 
#include <fibril_sync.h>
44 
#include <adt/hash_table.h>
 43 
#include <adt/hash_table.h>
45 
#include <adt/list.h>
 44 
#include <adt/list.h>
46 
 
 45 
 
47 
/*
 46 
/*
48 
 * Flags that can be used with block_get().
 47 
 * Flags that can be used with block_get().
Line 61... Line 60...
61 
#define BLOCK_FLAGS_NOREAD  1
 60 
#define BLOCK_FLAGS_NOREAD  1
62 
 
 61 
 
63 
typedef unsigned bn_t;  /**< Block number type. */
 62 
typedef unsigned bn_t;  /**< Block number type. */
64 
 
 63 
 
65 
typedef struct block {
 64 
typedef struct block {
66 
    /** Futex protecting the reference count. */
 65 
    /** Mutex protecting the reference count. */
67 
    futex_t lock;
 66 
    fibril_mutex_t lock;
68 
    /** Number of references to the block_t structure. */
 67 
    /** Number of references to the block_t structure. */
69 
    unsigned refcnt;
 68 
    unsigned refcnt;
70 
    /** If true, the block needs to be written back to the block device. */
 69 
    /** If true, the block needs to be written back to the block device. */
71 
    bool dirty;
 70 
    bool dirty;
72 
    /** Readers / Writer lock protecting the contents of the block. */
 71 
    /** Readers / Writer lock protecting the contents of the block. */
73 
    rwlock_t contents_lock;
 72 
    fibril_rwlock_t contents_lock;
74 
    /** Handle of the device where the block resides. */
 73 
    /** Handle of the device where the block resides. */
75 
    dev_handle_t dev_handle;
 74 
    dev_handle_t dev_handle;
76 
    /** Block offset on the block device. Counted in 'size'-byte blocks. */
 75 
    /** Block offset on the block device. Counted in 'size'-byte blocks. */
77 
    bn_t boff;
 76 
    bn_t boff;
78 
    /** Size of the block. */
 77 
    /** Size of the block. */
Line 83... Line 82...
83 
    link_t hash_link;
 82 
    link_t hash_link;
84 
    /** Buffer with the block data. */
 83 
    /** Buffer with the block data. */
85 
    void *data;
 84 
    void *data;
86 
} block_t;
 85 
} block_t;
87 
 
 86 
 
- 
 
 87 
/** Caching mode */
- 
 
 88 
enum cache_mode {
- 
 
 89 
    /** Write-Through */
- 
 
 90 
    CACHE_MODE_WT,
- 
 
 91 
    /** Write-Back */
- 
 
 92 
    CACHE_MODE_WB
- 
 
 93 
};
- 
 
 94 
 
88 
extern int block_init(dev_handle_t, size_t);
 95 
extern int block_init(dev_handle_t, size_t);
89 
extern void block_fini(dev_handle_t);
 96 
extern void block_fini(dev_handle_t);
90 
 
 97 
 
91 
extern int block_bb_read(dev_handle_t, off_t, size_t);
 98 
extern int block_bb_read(dev_handle_t, off_t, size_t);
92 
extern void *block_bb_get(dev_handle_t);
 99 
extern void *block_bb_get(dev_handle_t);
93 
 
 100 
 
94 
extern int block_cache_init(dev_handle_t, size_t, unsigned);
 101 
extern int block_cache_init(dev_handle_t, size_t, unsigned, enum cache_mode);
95 
 
 102 
 
96 
extern block_t *block_get(dev_handle_t, bn_t, int flags);
 103 
extern block_t *block_get(dev_handle_t, bn_t, int);
97 
extern void block_put(block_t *);
 104 
extern void block_put(block_t *);
98 
 
 105 
 
99 
extern int block_read(dev_handle_t, off_t *, size_t *, off_t *, void *, size_t,
 106 
extern int block_seqread(dev_handle_t, off_t *, size_t *, off_t *, void *,
100 
    size_t);
 107 
    size_t, size_t);
101 
 
 108 
 
102 
#endif
 109 
#endif
103 
 
 110 
 
104 
/** @}
 111 
/** @}
105 
 */
 112 
 */