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    link_t free_head;
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    link_t free_head;
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} cache_t;
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} cache_t;
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typedef struct {
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typedef struct {
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    link_t link;
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    link_t link;
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    int dev_handle;
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    dev_handle_t dev_handle;
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    int dev_phone;
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    int dev_phone;
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    void *com_area;
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    void *com_area;
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    size_t com_size;
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    size_t com_size;
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    void *bb_buf;
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    void *bb_buf;
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    off_t bb_off;
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    off_t bb_off;
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 * @param block_size    Block size to be used for the transfer.
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 * @param block_size    Block size to be used for the transfer.
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 *
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 *
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 * @return      EOK on success or a negative return code on failure.
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 * @return      EOK on success or a negative return code on failure.
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 */
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 */
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int
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int
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block_read(int dev_handle, off_t *bufpos, size_t *buflen, off_t *pos, void *dst,
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block_read(dev_handle_t dev_handle, off_t *bufpos, size_t *buflen, off_t *pos,
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    size_t size, size_t block_size)
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    void *dst, size_t size, size_t block_size)
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{
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{
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    off_t offset = 0;
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    off_t offset = 0;
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    size_t left = size;
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    size_t left = size;
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    devcon_t *devcon = devcon_search(dev_handle);
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    devcon_t *devcon = devcon_search(dev_handle);
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    assert(devcon);
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    assert(devcon);