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Merge up to 2.6.25-rc3
Merge of 2.6.x-xfs-melb:linux:30555a by kenmcd.

What:		/proc/diskstats
Date:		February 2008
Contact:	Jerome Marchand <jmarchan@redhat.com>
Description:
		The /proc/diskstats file displays the I/O statistics
		of block devices. Each line contains the following 14
		fields:
		 1 - major number
		 2 - minor mumber
		 3 - device name
		 4 - reads completed succesfully
		 5 - reads merged
		 6 - sectors read
		 7 - time spent reading (ms)
		 8 - writes completed
		 9 - writes merged
		10 - sectors written
		11 - time spent writing (ms)
		12 - I/Os currently in progress
		13 - time spent doing I/Os (ms)
		14 - weighted time spent doing I/Os (ms)
		For more details refer to Documentation/iostats.txt