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Commit 28832e83 authored by Mike Christie's avatar Mike Christie Committed by Jens Axboe
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[PATCH] update max_sectors documentation 



The max_sectors has been split into max_hw_sectors and max_sectors for some
time. A patch to have blk_queue_max_sectors enforce this was sent by
me and it broke IDE. This patch updates the documentation.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent 5d5d7727

Documentation/block/biodoc.txt

+12 −2
Original line number Diff line number Diff line
@@ -132,8 +132,18 @@ Some new queue property settings: 
		limit. No highmem default.



	blk_queue_max_sectors(q, max_sectors)

		Maximum size request you can handle in units of 512 byte

		sectors. 255 default.

		Sets two variables that limit the size of the request.



		- The request queue's max_sectors, which is a soft size in

		in units of 512 byte sectors, and could be dynamically varied

		by the core kernel.



		- The request queue's max_hw_sectors, which is a hard limit

		and reflects the maximum size request a driver can handle

		in units of 512 byte sectors.



		The default for both max_sectors and max_hw_sectors is

		255. The upper limit of max_sectors is 1024.



	blk_queue_max_phys_segments(q, max_segments)

		Maximum physical segments you can handle in a request. 128