Poul-Henning Kamp 7179e74f18 Give physio a makeover.
- Let physio take read/write compatible args and have it use uio->uio_rw
  to determine the direction.

- physread/physwrite are now #defines for physio

- Remove the inversly named minphys(), dev->si_iosize_max takes over.

- Physio() always uses pbufs.

- Fix the check for non page-aligned transfers, now only unaligned
  transfers larger than (MAXPHYS - PAGE_SIZE) get fragmented (only
  interesting for tapes using max blocksize).

- General wash-and-clean of code.

Constructive input from: bde
1999-10-09 19:44:32 +00:00
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