what is the purpose of file "/dev/tiercontrol"?

[nick]

Hi, recently, I am studying your code, and feel confused about the use of "/dev/tiercontrol". Is that for storing metadata? Thanks.

[Mark Ruijter]

The control device is used to setup the tier devices with ioctl. However since btier currently supports sysfs one could argue that sysfs should be used for everything.

/dev/tiercontrol is used for ioctl.
It has nothing to do with metadata.

Mark

Op 17 mei 2014 om 05:04 heeft "nick" zhan0903@users.sf.net het volgende geschreven:

Hi, recently, I am studying your code, and feel confused about the use of "/dev/tiercontrol". Is that for storing metadata? Thanks.

what is the purpose of file "/dev/tiercontrol"?

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[nick]

Thank you very much, and the use of "bitlistsize" is still confusing. What is the purpose of the number? Thanks.