Re: SCSI sg: Questions regarding jiffies usage

[Adrian Bunk <bunk@fs.tum.de>]

On Mon, Jul 12, 2004 at 07:11:54PM -0400, Douglas Gilbert wrote:

> Adrian,

Hi Doug,

> There may be some confusion here. The older struct
> sg_header interface did not have explicit per command timeouts.
> As a poor substitute an ioctl was added to associate
> a timeout (in seconds) to the file descriptor. This way
> subsequent commands issued via that file descriptor
> got the new timeout value. This is the "sfp->timeout"
> value. The snippets above show the "sfp->timeout"
> value being set to a default when a sg device is opened
> and then being changed after a SG_SET_TIMEOUT ioctl call.
> 
> The newer sg_io_hdr interface has per command timeouts
> (in milliseconds). A sg_io_hdr::timeout value overrides
> the "sfp->timeout" value. In the above code the
> sg_io_hdr::timeout value is in "srp->header.timeout".

thanks for the explanations.

> Doug Gilbert

cu
Adrian

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