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()
254 static errcode_t test_close(io_channel channel)  in test_close()
257 	errcode_t	retval = 0;  in test_close()
279 static errcode_t test_set_blksize(io_channel channel, int blksize)  in test_set_blksize()
282 	errcode_t	retval = 0;  in test_set_blksize()
303 static errcode_t test_read_blk(io_channel channel, unsigned long block,  in test_read_blk()
307 	errcode_t	retval = 0;  in test_read_blk()
330 static errcode_t test_write_blk(io_channel channel, unsigned long block,  in test_write_blk()
334 	errcode_t	retval = 0;  in test_write_blk()
357 static errcode_t test_read_blk64(io_channel channel, unsigned long long block,  in test_read_blk64()
361 	errcode_t	retval = 0;  in test_read_blk64()
384 static errcode_t test_write_blk64(io_channel channel, unsigned long long block,  in test_write_blk64()
388 	errcode_t	retval = 0;  in test_write_blk64()
411 static errcode_t test_write_byte(io_channel channel, unsigned long offset,  in test_write_byte()
415 	errcode_t	retval = 0;  in test_write_byte()
432 static errcode_t test_set_option(io_channel channel, const char *option,  in test_set_option()
436 	errcode_t	retval = 0;  in test_set_option()
459 static errcode_t test_get_stats(io_channel channel, io_stats *stats)  in test_get_stats()
462 	errcode_t	retval = 0;  in test_get_stats()
474 static errcode_t test_discard(io_channel channel, unsigned long long block,  in test_discard()
478 	errcode_t	retval = 0;  in test_discard()
493 static errcode_t test_cache_readahead(io_channel channel,  in test_cache_readahead()
498 	errcode_t	retval = 0;  in test_cache_readahead()
513 static errcode_t test_zeroout(io_channel channel, unsigned long long block,  in test_zeroout()
517 	errcode_t	retval = 0;  in test_zeroout()