Remove B_READ, B_WRITE and B_FREEBUF and replace them with a new

field in struct buf: b_iocmd.  The b_iocmd is enforced to have
exactly one bit set.

B_WRITE was bogusly defined as zero giving rise to obvious coding
mistakes.

Also eliminate the redundant struct buf flag B_CALL, it can just
as efficiently be done by comparing b_iodone to NULL.

Should you get a panic or drop into the debugger, complaining about
"b_iocmd", don't continue.  It is likely to write on your disk
where it should have been reading.

This change is a step in the direction towards a stackable BIO capability.

A lot of this patch were machine generated (Thanks to style(9) compliance!)

Vinum users:  Greg has not had time to test this yet, be careful.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/dev/amr/amr.c b/sys/dev/amr/amr.c
index 14dfec49e008..6d7524dc3679 100644
--- a/sys/dev/amr/amr.c
+++ b/sys/dev/amr/amr.c
@@ -853,7 +853,7 @@ amr_startio(struct amr_softc *sc)
 	ac->ac_private = bp;
 	ac->ac_data = bp->b_data;
 	ac->ac_length = bp->b_bcount;
-	if (bp->b_flags & B_READ) {
+	if (bp->b_iocmd == BIO_READ) {
 	    ac->ac_flags |= AMR_CMD_DATAIN;
 	    cmd = AMR_CMD_LREAD;
 	} else {