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

1 files changed, 3 insertions, 5 deletions

diff --git a/sys/sys/bio.h b/sys/sys/bio.h
index ae4dbfd..05e9863 100644
--- a/sys/sys/bio.h
+++ b/sys/sys/bio.h
@@ -480,11 +480,9 @@ int	cluster_read __P((struct vnode *, u_quad_t, daddr_t, long,
 	    struct ucred *, long, int, struct buf **));
 int	cluster_wbuild __P((struct vnode *, long, daddr_t, int));
 void	cluster_write __P((struct buf *, u_quad_t));
-int	physio __P((struct buf *, dev_t, int, u_int (*)(struct buf *),
-	    struct uio *));
-int	physread __P((dev_t dev, struct uio *uio, int ioflag));
-int	physwrite __P((dev_t dev, struct uio *uio, int ioflag));
-u_int	minphys __P((struct buf *));
+int	physio __P((dev_t dev, struct uio *uio, int ioflag));
+#define physread physio
+#define physwrite physio
 void	vfs_bio_set_validclean __P((struct buf *, int base, int size));
 void	vfs_bio_clrbuf __P((struct buf *));
 void	vfs_busy_pages __P((struct buf *, int clear_modify));