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After an I/O operation completes, immediately set B_BUSY again. Also, 

lower spl sooner, and remove an unneeded splbio()/splx() pair.
This commit is contained in:
mycroft 1995-07-27 02:37:12 +00:00
parent 7ba8b413d9
commit 605a125097
1 changed files with 7 additions and 6 deletions
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13
sys/kern/kern_physio.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_physio.c,v 1.22 1995/07/24 07:45:24 cgd Exp $ */
/* $NetBSD: kern_physio.c,v 1.23 1995/07/27 02:37:12 mycroft Exp $ */
/*-
* Copyright (c) 1994 Christopher G. Demetriou
@ -136,9 +136,7 @@ physio(strategy, bp, dev, flags, minphys, uio)
* "Set by physio for raw transfers.", in addition
* to the "busy" and read/write flag.)
*/
s = splbio();
bp->b_flags = B_BUSY | B_PHYS | B_RAW | flags;
splx(s);
/* [set up the buffer for a maximum-sized transfer] */
bp->b_blkno = btodb(uio->uio_offset);
@ -184,6 +182,12 @@ physio(strategy, bp, dev, flags, minphys, uio)
while ((bp->b_flags & B_DONE) == 0)
tsleep((caddr_t) bp, PRIBIO + 1, "physio", 0);
/* Mark it busy again, so nobody else will use it. */
bp->b_flags |= B_BUSY;
/* [lower the priority level] */
splx(s);
/*
* [unlock the part of the address space previously
* locked]
@ -196,9 +200,6 @@ physio(strategy, bp, dev, flags, minphys, uio)
if (bp->b_flags & B_ERROR)
error = (bp->b_error ? bp->b_error : EIO);
/* [lower the priority level] */
splx(s);
/*
* [deduct the transfer size from the total number
* of data to transfer]