From: Seymour, Shane M Date: Wed, 6 May 2015 01:37:20 +0000 (+0000) Subject: st: implement tape statistics X-Git-Tag: omap-for-v4.2/fixes-rc1^2~151^2~47 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05545c92db9637318a98d3d59d400beb819decc7;p=pandora-kernel.git st: implement tape statistics This patch implements tape statistics in the st module via sysfs. Current no statistics are available for tape I/O and there is no easy way to reuse the block layer statistics for tape as tape is a character device and does not have perform I/O in sector sized chunks (the size of the data written to tape can change). For tapes we also need extra stats related to things like tape movement (via other I/O). There have been multiple end users requesting statistics including AT&T (and some HP customers who have not given permission to be named). It is impossible for them to investigate any issues related to tape performance in a non-invasive way. [jejb: eliminate PRId64] Signed-off-by: Shane Seymour Tested-by: Shane Seymour Reviewed-by: Christoph Hellwig Signed-off-by: James Bottomley --- Reading git-diff-tree failed