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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