writev to scsi disks

[Dheeraj Pandey]

I was wondering if I did a simple writev to a SCSI disk, does it take
the sg path to the device? I am guessing sg (REQ_SPECIAL) is only
true for character devices (and ioctl's) and not block devices.

These are my questions:
  - Is sg a common feature among SCSI disks these days? How do I know
what disks support this feature (any capabilities published by the driver)?
  - How does one make writev work for SCSI disk (as a block device)
in direct_io?
  - If I use SCSI disks as character device, can I simply use writev on the
character device file, and will sg codepath be taken?
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