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The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

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+
+struct request documentation
+
+Jens Axboe <jens.axboe@oracle.com> 27/05/02
+
+1.0
+Index
+
+2.0 Struct request members classification
+
+	2.1 struct request members explanation
+
+3.0
+
+
+2.0
+Short explanation of request members
+
+Classification flags:
+
+	D	driver member
+	B	block layer member
+	I	I/O scheduler member
+
+Unless an entry contains a D classification, a device driver must not access
+this member. Some members may contain D classifications, but should only be
+access through certain macros or functions (eg ->flags).
+
+<linux/blkdev.h>
+
+2.1
+Member				Flag	Comment
+------				----	-------
+
+struct list_head queuelist	BI	Organization on various internal
+					queues
+
+void *elevator_private		I	I/O scheduler private data
+
+unsigned char cmd[16]		D	Driver can use this for setting up
+					a cdb before execution, see
+					blk_queue_prep_rq
+
+unsigned long flags		DBI	Contains info about data direction,
+					request type, etc.
+
+int rq_status			D	Request status bits
+
+kdev_t rq_dev			DBI	Target device
+
+int errors			DB	Error counts
+
+sector_t sector			DBI	Target location
+
+unsigned long hard_nr_sectors	B	Used to keep sector sane
+
+unsigned long nr_sectors	DBI	Total number of sectors in request
+
+unsigned long hard_nr_sectors	B	Used to keep nr_sectors sane
+
+unsigned short nr_phys_segments	DB	Number of physical scatter gather
+					segments in a request
+
+unsigned short nr_hw_segments	DB	Number of hardware scatter gather
+					segments in a request
+
+unsigned int current_nr_sectors	DB	Number of sectors in first segment
+					of request
+
+unsigned int hard_cur_sectors	B	Used to keep current_nr_sectors sane
+
+int tag				DB	TCQ tag, if assigned
+
+void *special			D	Free to be used by driver
+
+char *buffer			D	Map of first segment, also see
+					section on bouncing SECTION
+
+struct completion *waiting	D	Can be used by driver to get signalled
+					on request completion
+
+struct bio *bio			DBI	First bio in request
+
+struct bio *biotail		DBI	Last bio in request
+
+struct request_queue *q		DB	Request queue this request belongs to
+
+struct request_list *rl		B	Request list this request came from