Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/Documentation/block/request.txt b/Documentation/block/request.txt
new file mode 100644
index 0000000..75924e2
--- /dev/null
+++ b/Documentation/block/request.txt
@@ -0,0 +1,88 @@
+
+struct request documentation
+
+Jens Axboe <axboe@suse.de> 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
+
+request_queue_t *q DB Request queue this request belongs to
+
+struct request_list *rl B Request list this request came from