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Don't throw NFS B_DELWRI buffers back to the vm system in brelse.

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Make sure that b_validoff..b_validend is at least as big as
b_dirtyoff..b_dirtyend.
This commit is contained in:
Doug Rabson 1997-06-06 09:04:28 +00:00
parent 2d1500e4de
commit e90b93a1d0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=26471
1 changed files with 11 additions and 3 deletions
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14
sys/kern/vfs_bio.c
View file

@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.117 1997/05/30 22:25:35 dfr Exp $
* $Id: vfs_bio.c,v 1.118 1997/06/03 09:42:43 dfr Exp $
*/
/*
@ -515,6 +515,8 @@ brelse(struct buf * bp)
* XXX this seems to cause performance problems.
*/
if ((bp->b_flags & B_VMIO)
&& !(bp->b_vp->v_tag == VT_NFS &&
(bp->b_flags & B_DELWRI) != 0)
#ifdef notdef
&& (bp->b_vp->v_tag != VT_NFS
|| (bp->b_flags & (B_NOCACHE | B_INVAL | B_ERROR))
@ -1498,8 +1500,14 @@ allocbuf(struct buf * bp, int size)
bp->b_pages[pageindex] = m;
curbpnpages = pageindex + 1;
}
if (vp->v_tag == VT_NFS && bp->b_validend == 0)
bp->b_flags &= ~B_CACHE;
if (vp->v_tag == VT_NFS) {
if (bp->b_dirtyend > 0) {
bp->b_validoff = min(bp->b_validoff, bp->b_dirtyoff);
bp->b_validend = max(bp->b_validend, bp->b_dirtyend);
}
if (bp->b_validend == 0)
bp->b_flags &= ~B_CACHE;
}
bp->b_data = (caddr_t) trunc_page(bp->b_data);
bp->b_npages = curbpnpages;
pmap_qenter((vm_offset_t) bp->b_data,