52 	void (*read_blk)(unsigned long block, int count, errcode_t err);
53 	void (*write_blk)(unsigned long block, int count, errcode_t err);
54 	void (*set_blksize)(int blksize, errcode_t err);
55 	void (*write_byte)(unsigned long block, int count, errcode_t err);
56 	void (*read_blk64)(unsigned long long block, int count, errcode_t err);
57 	void (*write_blk64)(unsigned long long block, int count, errcode_t err);
66 	(unsigned long block, int count, errcode_t err) = 0;
68 	(unsigned long block, int count, errcode_t err) = 0;
70 	(unsigned long long block, int count, errcode_t err) = 0;
72 	(unsigned long long block, int count, errcode_t err) = 0;
74 	(int blksize, errcode_t err) = 0;
76 	(unsigned long block, int count, errcode_t err) = 0;
114 static errcode_t test_flush(io_channel channel)  in test_flush()
117 	errcode_t			retval = 0;  in test_flush()
172 static errcode_t test_open(const char *name, int flags, io_channel *channel)  in test_open()
176 	errcode_t	retval;  in test_open()
258 static errcode_t test_close(io_channel channel)  in test_close()
261 	errcode_t	retval = 0;  in test_close()
283 static errcode_t test_set_blksize(io_channel channel, int blksize)  in test_set_blksize()
286 	errcode_t	retval = 0;  in test_set_blksize()
307 static errcode_t test_read_blk(io_channel channel, unsigned long block,  in test_read_blk()
311 	errcode_t	retval = 0;  in test_read_blk()
334 static errcode_t test_write_blk(io_channel channel, unsigned long block,  in test_write_blk()
338 	errcode_t	retval = 0;  in test_write_blk()
361 static errcode_t test_read_blk64(io_channel channel, unsigned long long block,  in test_read_blk64()
365 	errcode_t	retval = 0;  in test_read_blk64()
388 static errcode_t test_write_blk64(io_channel channel, unsigned long long block,  in test_write_blk64()
392 	errcode_t	retval = 0;  in test_write_blk64()
415 static errcode_t test_write_byte(io_channel channel, unsigned long offset,  in test_write_byte()
419 	errcode_t	retval = 0;  in test_write_byte()
436 static errcode_t test_set_option(io_channel channel, const char *option,  in test_set_option()
440 	errcode_t	retval = 0;  in test_set_option()
463 static errcode_t test_get_stats(io_channel channel, io_stats *stats)  in test_get_stats()
466 	errcode_t	retval = 0;  in test_get_stats()
478 static errcode_t test_discard(io_channel channel, unsigned long long block,  in test_discard()
482 	errcode_t	retval = 0;  in test_discard()
497 static errcode_t test_cache_readahead(io_channel channel,  in test_cache_readahead()
502 	errcode_t	retval = 0;  in test_cache_readahead()
517 static errcode_t test_zeroout(io_channel channel, unsigned long long block,  in test_zeroout()
521 	errcode_t	retval = 0;  in test_zeroout()