64 	io_channel real;
73 static errcode_t undo_open(const char *name, int flags, io_channel *channel);
74 static errcode_t undo_close(io_channel channel);
75 static errcode_t undo_set_blksize(io_channel channel, int blksize);
76 static errcode_t undo_read_blk64(io_channel channel, unsigned long long block,
78 static errcode_t undo_write_blk64(io_channel channel, unsigned long long block,
80 static errcode_t undo_read_blk(io_channel channel, unsigned long block,
82 static errcode_t undo_write_blk(io_channel channel, unsigned long block,
84 static errcode_t undo_flush(io_channel channel);
85 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,
87 static errcode_t undo_set_option(io_channel channel, const char *option,
89 static errcode_t undo_get_stats(io_channel channel, io_stats *stats);
136 static errcode_t write_file_system_identity(io_channel undo_channel,  in write_file_system_identity()
143 	io_channel channel;  in write_file_system_identity()
200 static errcode_t undo_write_tdb(io_channel channel,  in undo_write_tdb()
333 static errcode_t undo_io_read_error(io_channel channel ATTR((unused)),  in undo_io_read_error()
345 static void undo_err_handler_init(io_channel channel)  in undo_err_handler_init()
350 static errcode_t undo_open(const char *name, int flags, io_channel *channel)  in undo_open()
352 	io_channel	io = NULL;  in undo_open()
419 static errcode_t undo_close(io_channel channel)  in undo_close()
446 static errcode_t undo_set_blksize(io_channel channel, int blksize)  in undo_set_blksize()
467 static errcode_t undo_read_blk64(io_channel channel, unsigned long long block,  in undo_read_blk64()
483 static errcode_t undo_read_blk(io_channel channel, unsigned long block,  in undo_read_blk()
489 static errcode_t undo_write_blk64(io_channel channel, unsigned long long block,  in undo_write_blk64()
510 static errcode_t undo_write_blk(io_channel channel, unsigned long block,  in undo_write_blk()
516 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,  in undo_write_byte()
550 static errcode_t undo_flush(io_channel channel)  in undo_flush()
565 static errcode_t undo_set_option(io_channel channel, const char *option,  in undo_set_option()
609 static errcode_t undo_get_stats(io_channel channel, io_stats *stats)  in undo_get_stats()