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#include <futex.h>
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#include <futex.h>
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#include <rwlock.h>
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#include <rwlock.h>
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#include <libadt/hash_table.h>
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#include <libadt/hash_table.h>
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#include <libadt/list.h>
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#include <libadt/list.h>
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/*
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 * Flags that can be used with block_get().
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 */
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/**
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 * This macro is a symbolic value for situations where no special flags are
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 * needed.
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 */
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#define BLOCK_FLAGS_NONE    0
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/**
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 * When the client of block_get() intends to overwrite the current contents of
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 * the block, this flag is used to avoid the unnecessary read.
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 */
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#define BLOCK_FLAGS_NOREAD  1
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typedef unsigned bn_t;  /**< Block number type. */
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typedef struct block {
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typedef struct block {
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    /** Futex protecting the reference count. */
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    /** Futex protecting the reference count. */
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    futex_t lock;
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    futex_t lock;
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    /** Number of references to the block_t structure. */
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    /** Number of references to the block_t structure. */
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    unsigned refcnt;
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    unsigned refcnt;
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    /** Readers / Writer lock protecting the contents of the block. */
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    /** Readers / Writer lock protecting the contents of the block. */
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    rwlock_t contents_lock;
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    rwlock_t contents_lock;
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    /** Handle of the device where the block resides. */
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    /** Handle of the device where the block resides. */
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    dev_handle_t dev_handle;
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    dev_handle_t dev_handle;
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    /** Block offset on the block device. Counted in 'size'-byte blocks. */
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    /** Block offset on the block device. Counted in 'size'-byte blocks. */
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    off_t boff;
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    bn_t boff;
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    /** Size of the block. */
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    /** Size of the block. */
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    size_t size;
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    size_t size;
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    /** Link for placing the block into the free block list. */
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    /** Link for placing the block into the free block list. */
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    link_t free_link;
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    link_t free_link;
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    /** Link for placing the block into the block hash table. */
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    /** Link for placing the block into the block hash table. */
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    link_t hash_link;
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    link_t hash_link;
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    /** Buffer with the block data. */
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    /** Buffer with the block data. */
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    void *data;
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    void *data;
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} block_t;
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} block_t;
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extern int block_init(dev_handle_t, size_t, off_t, size_t);
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extern int block_init(dev_handle_t, size_t);
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extern void block_fini(dev_handle_t);
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extern void block_fini(dev_handle_t);
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extern int block_bb_read(dev_handle_t, off_t, size_t);
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extern void *block_bb_get(dev_handle_t);
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extern void *block_bb_get(dev_handle_t);
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extern int block_cache_init(dev_handle_t, size_t, unsigned);
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extern block_t *block_get(dev_handle_t, off_t, size_t);
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extern block_t *block_get(dev_handle_t, bn_t, int flags);
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extern void block_put(block_t *);
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extern void block_put(block_t *);
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extern bool block_read(int, off_t *, size_t *, off_t *, void *, size_t, size_t);
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extern int block_read(int, off_t *, size_t *, off_t *, void *, size_t, size_t);
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#endif
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#endif
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/** @}
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/** @}
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 */
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 */