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bdwrite() should upgrade writes to tape devices by sending them to

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bawrite().  it's logically more correct (doesn't return an error code,
because it's async; bdwrite is also async), it still writes things
in-order, it makes sure the proper accountins is done (see the
wasdelayed cases in bwrite()), and it allows writes to vnodes on volumes
mountd with the MNT_ASYNC to be converted into delayed writes the way
God, err, Kirk intended.  Convert synchronous bwrite()s on MNT_ASYNC
file systems to delayed writes.
This commit is contained in:
cgd 1995-07-12 07:56:31 +00:00
parent 9c3fe30d92
commit f5bbdfba41
1 changed files with 9 additions and 5 deletions
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14
sys/kern/vfs_bio.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_bio.c,v 1.37 1995/07/12 07:39:00 cgd Exp $ */
/* $NetBSD: vfs_bio.c,v 1.38 1995/07/12 07:56:31 cgd Exp $ */
/*-
* Copyright (c) 1994 Christopher G. Demetriou
@ -267,15 +267,19 @@ bwrite(bp)
{
int rv, s, sync, wasdelayed;
/* Remember buffer type, to switch on it later. */
/*
* Remember buffer type, to switch on it later. If the write was
* synchronous, but the file system was mounted with MNT_ASYNC,
* convert it to a delayed write.
* XXX note that this relies on delayed tape writes being converted
* to async, not sync writes (which is safe, but ugly).
*/
sync = !ISSET(bp->b_flags, B_ASYNC);
#if 0
if (sync && bp->b_vp && bp->b_vp->v_mount &&
ISSET(bp->b_vp->v_mount->mnt_flag, MNT_ASYNC)) {
bdwrite(bp);
return (0);
}
#endif
wasdelayed = ISSET(bp->b_flags, B_DELWRI);
CLR(bp->b_flags, (B_READ | B_DONE | B_ERROR | B_DELWRI));
@ -362,7 +366,7 @@ bdwrite(bp)
/* If this is a tape block, write the block now. */
if (bdevsw[major(bp->b_dev)].d_type == D_TAPE) {
bwrite(bp);
bawrite(bp);
return;
}