Linux kernel development work - see feature branches https://git.zx2c4.com/linux-dev/atom/Documentation/ABI/testing/sysfs-class-scsi_tape?h=master 2015-06-02T15:03:25Z 2015-06-02T15:03:25Z Seymour, Shane M shane.seymour@hp.com 2015-05-06T01:37:20Z urn:sha1:05545c92db9637318a98d3d59d400beb819decc7 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 <shane.seymour@hp.com> Tested-by: Shane Seymour <shane.seymour@hp.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>