[RFC] implementing tape statistics single file vs multi-file in sysfs

Hello linux-api'ers

There has been some ongoing discussion about the best way to implement tape statistics. The original method suggested a long time ago used a single file in sysfs similar to block statistics in sysfs. That lead to an impass about the code on the linux-scsi mailing list.

The sysfs documentation says that files should contain one item per file (with some small exceptions):

"Attributes should be ASCII text files, preferably with only one value
per file. It is noted that it may not be efficient to contain only one
value per file, so it is socially acceptable to express an array of
values of the same type."

The current patch that implements tape statistics is here:

http://marc.info/?l=linux-scsi&m=142112067313723&w=2

Recently there was was another discussion here about one file vs a collection of files for tape statistics:

http://marc.info/?l=linux-scsi&m=142316255501550&w=2

The result was that I should ask here what method I should use. I would like to get feedback in relation to tape statistics and one file vs multi-file in sysfs. I'm happy to keep the existing code or change to a single file approach.

Thanks
Shane