ssize_t write_lseek_blockwise(int fd, int bsize, char *buf, size_t count, off_t offset);
unsigned crypt_getpagesize(void);
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+int init_crypto(struct crypt_device *ctx);
void logger(struct crypt_device *cd, int class, const char *file, int line, const char *format, ...);
#define log_dbg(x...) logger(NULL, CRYPT_LOG_DEBUG, __FILE__, __LINE__, x)