60d13c7a9d
and local variables, goto labels, and functions declared but not defined.
1290 lines
33 KiB
C
1290 lines
33 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95
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* $Id: nfs_bio.c,v 1.63 1998/11/09 07:00:14 peter Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/kernel.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <vm/vnode_pager.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfs.h>
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#include <nfs/nfsmount.h>
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#include <nfs/nqnfs.h>
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#include <nfs/nfsnode.h>
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static struct buf *nfs_getcacheblk __P((struct vnode *vp, daddr_t bn, int size,
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struct proc *p));
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static void nfs_prot_buf __P((struct buf *bp, int off, int n));
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extern int nfs_numasync;
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extern struct nfsstats nfsstats;
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/*
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* Vnode op for VM getpages.
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*/
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int
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nfs_getpages(ap)
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struct vop_getpages_args /* {
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struct vnode *a_vp;
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vm_page_t *a_m;
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int a_count;
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int a_reqpage;
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vm_ooffset_t a_offset;
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} */ *ap;
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{
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int i, error, nextoff, size, toff, npages, count;
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struct uio uio;
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struct iovec iov;
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vm_offset_t kva;
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struct buf *bp;
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struct vnode *vp;
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struct proc *p;
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struct ucred *cred;
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struct nfsmount *nmp;
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vm_page_t *pages;
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vp = ap->a_vp;
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p = curproc; /* XXX */
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cred = curproc->p_ucred; /* XXX */
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nmp = VFSTONFS(vp->v_mount);
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pages = ap->a_m;
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count = ap->a_count;
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if (vp->v_object == NULL) {
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printf("nfs_getpages: called with non-merged cache vnode??\n");
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return VM_PAGER_ERROR;
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}
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if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
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(nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
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(void)nfs_fsinfo(nmp, vp, cred, p);
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/*
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* We use only the kva address for the buffer, but this is extremely
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* convienient and fast.
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*/
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bp = getpbuf();
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npages = btoc(count);
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kva = (vm_offset_t) bp->b_data;
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pmap_qenter(kva, pages, npages);
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iov.iov_base = (caddr_t) kva;
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iov.iov_len = count;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
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uio.uio_resid = count;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_READ;
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uio.uio_procp = p;
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error = nfs_readrpc(vp, &uio, cred);
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pmap_qremove(kva, npages);
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relpbuf(bp);
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if (error && (uio.uio_resid == count))
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return VM_PAGER_ERROR;
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size = count - uio.uio_resid;
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for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
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vm_page_t m;
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nextoff = toff + PAGE_SIZE;
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m = pages[i];
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m->flags &= ~PG_ZERO;
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if (nextoff <= size) {
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m->valid = VM_PAGE_BITS_ALL;
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m->dirty = 0;
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} else {
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int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
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vm_page_set_validclean(m, 0, nvalid);
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}
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if (i != ap->a_reqpage) {
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/*
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* Whether or not to leave the page activated is up in
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* the air, but we should put the page on a page queue
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* somewhere (it already is in the object). Result:
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* It appears that emperical results show that
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* deactivating pages is best.
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*/
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/*
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* Just in case someone was asking for this page we
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* now tell them that it is ok to use.
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*/
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if (!error) {
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if (m->flags & PG_WANTED)
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vm_page_activate(m);
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else
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vm_page_deactivate(m);
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vm_page_wakeup(m);
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} else {
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vnode_pager_freepage(m);
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}
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}
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}
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return 0;
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}
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/*
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* Vnode op for VM putpages.
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*/
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int
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nfs_putpages(ap)
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struct vop_putpages_args /* {
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struct vnode *a_vp;
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vm_page_t *a_m;
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int a_count;
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int a_sync;
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int *a_rtvals;
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vm_ooffset_t a_offset;
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} */ *ap;
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{
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struct uio uio;
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struct iovec iov;
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vm_offset_t kva;
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struct buf *bp;
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int iomode, must_commit, i, error, npages, count;
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int *rtvals;
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struct vnode *vp;
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struct proc *p;
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struct ucred *cred;
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struct nfsmount *nmp;
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vm_page_t *pages;
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vp = ap->a_vp;
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p = curproc; /* XXX */
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cred = curproc->p_ucred; /* XXX */
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nmp = VFSTONFS(vp->v_mount);
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pages = ap->a_m;
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count = ap->a_count;
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rtvals = ap->a_rtvals;
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npages = btoc(count);
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if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
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(nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
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(void)nfs_fsinfo(nmp, vp, cred, p);
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for (i = 0; i < npages; i++) {
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rtvals[i] = VM_PAGER_AGAIN;
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}
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/*
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* We use only the kva address for the buffer, but this is extremely
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* convienient and fast.
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*/
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bp = getpbuf();
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kva = (vm_offset_t) bp->b_data;
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pmap_qenter(kva, pages, npages);
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iov.iov_base = (caddr_t) kva;
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iov.iov_len = count;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
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uio.uio_resid = count;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_WRITE;
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uio.uio_procp = p;
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if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
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iomode = NFSV3WRITE_UNSTABLE;
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else
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iomode = NFSV3WRITE_FILESYNC;
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error = nfs_writerpc(vp, &uio, cred, &iomode, &must_commit);
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pmap_qremove(kva, npages);
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relpbuf(bp);
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if (!error) {
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int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
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for (i = 0; i < nwritten; i++) {
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rtvals[i] = VM_PAGER_OK;
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pages[i]->dirty = 0;
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}
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if (must_commit)
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nfs_clearcommit(vp->v_mount);
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}
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return rtvals[0];
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}
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/*
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* Vnode op for read using bio
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*/
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int
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nfs_bioread(vp, uio, ioflag, cred, getpages)
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register struct vnode *vp;
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register struct uio *uio;
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int ioflag;
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struct ucred *cred;
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int getpages;
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{
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register struct nfsnode *np = VTONFS(vp);
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register int biosize, diff, i;
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struct buf *bp = 0, *rabp;
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struct vattr vattr;
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struct proc *p;
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struct nfsmount *nmp = VFSTONFS(vp->v_mount);
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daddr_t lbn, rabn;
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int bufsize;
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int nra, error = 0, n = 0, on = 0, not_readin;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("nfs_read mode");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
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return (EINVAL);
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p = uio->uio_procp;
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if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
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(nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
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(void)nfs_fsinfo(nmp, vp, cred, p);
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if (vp->v_type != VDIR &&
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(uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
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return (EFBIG);
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biosize = vp->v_mount->mnt_stat.f_iosize;
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/*
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* For nfs, cache consistency can only be maintained approximately.
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* Although RFC1094 does not specify the criteria, the following is
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* believed to be compatible with the reference port.
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* For nqnfs, full cache consistency is maintained within the loop.
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* For nfs:
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* If the file's modify time on the server has changed since the
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* last read rpc or you have written to the file,
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* you may have lost data cache consistency with the
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* server, so flush all of the file's data out of the cache.
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* Then force a getattr rpc to ensure that you have up to date
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* attributes.
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* NB: This implies that cache data can be read when up to
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* NFS_ATTRTIMEO seconds out of date. If you find that you need current
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* attributes this could be forced by setting n_attrstamp to 0 before
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* the VOP_GETATTR() call.
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*/
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if ((nmp->nm_flag & NFSMNT_NQNFS) == 0) {
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if (np->n_flag & NMODIFIED) {
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if (vp->v_type != VREG) {
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if (vp->v_type != VDIR)
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panic("nfs: bioread, not dir");
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nfs_invaldir(vp);
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error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return (error);
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}
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np->n_attrstamp = 0;
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error = VOP_GETATTR(vp, &vattr, cred, p);
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if (error)
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return (error);
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np->n_mtime = vattr.va_mtime.tv_sec;
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} else {
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error = VOP_GETATTR(vp, &vattr, cred, p);
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if (error)
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return (error);
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if (np->n_mtime != vattr.va_mtime.tv_sec) {
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if (vp->v_type == VDIR)
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nfs_invaldir(vp);
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error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return (error);
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np->n_mtime = vattr.va_mtime.tv_sec;
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}
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}
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}
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do {
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/*
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* Get a valid lease. If cached data is stale, flush it.
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*/
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if (nmp->nm_flag & NFSMNT_NQNFS) {
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if (NQNFS_CKINVALID(vp, np, ND_READ)) {
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do {
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error = nqnfs_getlease(vp, ND_READ, cred, p);
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} while (error == NQNFS_EXPIRED);
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if (error)
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return (error);
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if (np->n_lrev != np->n_brev ||
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(np->n_flag & NQNFSNONCACHE) ||
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((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) {
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if (vp->v_type == VDIR)
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nfs_invaldir(vp);
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error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return (error);
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np->n_brev = np->n_lrev;
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}
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} else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) {
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nfs_invaldir(vp);
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error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return (error);
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}
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}
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if (np->n_flag & NQNFSNONCACHE) {
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switch (vp->v_type) {
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case VREG:
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return (nfs_readrpc(vp, uio, cred));
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case VLNK:
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return (nfs_readlinkrpc(vp, uio, cred));
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case VDIR:
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break;
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default:
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printf(" NQNFSNONCACHE: type %x unexpected\n",
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vp->v_type);
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};
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}
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switch (vp->v_type) {
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case VREG:
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nfsstats.biocache_reads++;
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lbn = uio->uio_offset / biosize;
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on = uio->uio_offset & (biosize - 1);
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not_readin = 1;
|
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|
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/*
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* Start the read ahead(s), as required.
|
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*/
|
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if (nfs_numasync > 0 && nmp->nm_readahead > 0) {
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for (nra = 0; nra < nmp->nm_readahead &&
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(off_t)(lbn + 1 + nra) * biosize < np->n_size; nra++) {
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rabn = lbn + 1 + nra;
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if (!incore(vp, rabn)) {
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rabp = nfs_getcacheblk(vp, rabn, biosize, p);
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if (!rabp)
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return (EINTR);
|
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if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
|
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rabp->b_flags |= (B_READ | B_ASYNC);
|
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vfs_busy_pages(rabp, 0);
|
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if (nfs_asyncio(rabp, cred)) {
|
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rabp->b_flags |= B_INVAL|B_ERROR;
|
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vfs_unbusy_pages(rabp);
|
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brelse(rabp);
|
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}
|
|
} else
|
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brelse(rabp);
|
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}
|
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}
|
|
}
|
|
|
|
/*
|
|
* If the block is in the cache and has the required data
|
|
* in a valid region, just copy it out.
|
|
* Otherwise, get the block and write back/read in,
|
|
* as required.
|
|
*/
|
|
again:
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bufsize = biosize;
|
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if ((off_t)(lbn + 1) * biosize > np->n_size &&
|
|
(off_t)(lbn + 1) * biosize - np->n_size < biosize) {
|
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bufsize = np->n_size - lbn * biosize;
|
|
bufsize = (bufsize + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
|
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}
|
|
bp = nfs_getcacheblk(vp, lbn, bufsize, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
/*
|
|
* If we are being called from nfs_getpages, we must
|
|
* make sure the buffer is a vmio buffer. The vp will
|
|
* already be setup for vmio but there may be some old
|
|
* non-vmio buffers attached to it.
|
|
*/
|
|
if (getpages && !(bp->b_flags & B_VMIO)) {
|
|
#ifdef DIAGNOSTIC
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|
printf("nfs_bioread: non vmio buf found, discarding\n");
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|
#endif
|
|
bp->b_flags |= B_NOCACHE;
|
|
bp->b_flags |= B_INVAFTERWRITE;
|
|
if (bp->b_dirtyend > 0) {
|
|
if ((bp->b_flags & B_DELWRI) == 0)
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panic("nfsbioread");
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|
if (VOP_BWRITE(bp) == EINTR)
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|
return (EINTR);
|
|
} else
|
|
brelse(bp);
|
|
goto again;
|
|
}
|
|
if ((bp->b_flags & B_CACHE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
bp->b_flags &= ~(B_DONE | B_ERROR | B_INVAL);
|
|
not_readin = 0;
|
|
vfs_busy_pages(bp, 0);
|
|
error = nfs_doio(bp, cred, p);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
if (bufsize > on) {
|
|
n = min((unsigned)(bufsize - on), uio->uio_resid);
|
|
} else {
|
|
n = 0;
|
|
}
|
|
diff = np->n_size - uio->uio_offset;
|
|
if (diff < n)
|
|
n = diff;
|
|
if (not_readin && n > 0) {
|
|
if (on < bp->b_validoff || (on + n) > bp->b_validend) {
|
|
bp->b_flags |= B_NOCACHE;
|
|
bp->b_flags |= B_INVAFTERWRITE;
|
|
if (bp->b_dirtyend > 0) {
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("nfsbioread");
|
|
if (VOP_BWRITE(bp) == EINTR)
|
|
return (EINTR);
|
|
} else
|
|
brelse(bp);
|
|
goto again;
|
|
}
|
|
}
|
|
vp->v_lastr = lbn;
|
|
diff = (on >= bp->b_validend) ? 0 : (bp->b_validend - on);
|
|
if (diff < n)
|
|
n = diff;
|
|
break;
|
|
case VLNK:
|
|
nfsstats.biocache_readlinks++;
|
|
bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if ((bp->b_flags & B_CACHE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
vfs_busy_pages(bp, 0);
|
|
error = nfs_doio(bp, cred, p);
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
|
|
on = 0;
|
|
break;
|
|
case VDIR:
|
|
nfsstats.biocache_readdirs++;
|
|
if (np->n_direofoffset
|
|
&& uio->uio_offset >= np->n_direofoffset) {
|
|
return (0);
|
|
}
|
|
lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
|
|
on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
|
|
bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if ((bp->b_flags & B_CACHE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
vfs_busy_pages(bp, 0);
|
|
error = nfs_doio(bp, cred, p);
|
|
if (error) {
|
|
brelse(bp);
|
|
}
|
|
while (error == NFSERR_BAD_COOKIE) {
|
|
nfs_invaldir(vp);
|
|
error = nfs_vinvalbuf(vp, 0, cred, p, 1);
|
|
/*
|
|
* Yuck! The directory has been modified on the
|
|
* server. The only way to get the block is by
|
|
* reading from the beginning to get all the
|
|
* offset cookies.
|
|
*/
|
|
for (i = 0; i <= lbn && !error; i++) {
|
|
if (np->n_direofoffset
|
|
&& (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
|
|
return (0);
|
|
bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if ((bp->b_flags & B_DONE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
vfs_busy_pages(bp, 0);
|
|
error = nfs_doio(bp, cred, p);
|
|
if (error == 0 && (bp->b_flags & B_INVAL))
|
|
break;
|
|
if (error) {
|
|
brelse(bp);
|
|
} else if (i < lbn) {
|
|
brelse(bp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* If not eof and read aheads are enabled, start one.
|
|
* (You need the current block first, so that you have the
|
|
* directory offset cookie of the next block.)
|
|
*/
|
|
if (nfs_numasync > 0 && nmp->nm_readahead > 0 &&
|
|
(bp->b_flags & B_INVAL) == 0 &&
|
|
(np->n_direofoffset == 0 ||
|
|
(lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
|
|
!(np->n_flag & NQNFSNONCACHE) &&
|
|
!incore(vp, lbn + 1)) {
|
|
rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, p);
|
|
if (rabp) {
|
|
if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
|
|
rabp->b_flags |= (B_READ | B_ASYNC);
|
|
vfs_busy_pages(rabp, 0);
|
|
if (nfs_asyncio(rabp, cred)) {
|
|
rabp->b_flags |= B_INVAL|B_ERROR;
|
|
vfs_unbusy_pages(rabp);
|
|
brelse(rabp);
|
|
}
|
|
} else {
|
|
brelse(rabp);
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* Make sure we use a signed variant of min() since
|
|
* the second term may be negative.
|
|
*/
|
|
n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
|
|
break;
|
|
default:
|
|
printf(" nfs_bioread: type %x unexpected\n",vp->v_type);
|
|
break;
|
|
};
|
|
|
|
if (n > 0) {
|
|
error = uiomove(bp->b_data + on, (int)n, uio);
|
|
}
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
break;
|
|
case VLNK:
|
|
n = 0;
|
|
break;
|
|
case VDIR:
|
|
if (np->n_flag & NQNFSNONCACHE)
|
|
bp->b_flags |= B_INVAL;
|
|
break;
|
|
default:
|
|
printf(" nfs_bioread: type %x unexpected\n",vp->v_type);
|
|
}
|
|
brelse(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n > 0);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
nfs_prot_buf(bp, off, n)
|
|
struct buf *bp;
|
|
int off;
|
|
int n;
|
|
{
|
|
int pindex, boff, end;
|
|
|
|
if ((bp->b_flags & B_VMIO) == 0)
|
|
return;
|
|
|
|
end = round_page(off + n);
|
|
for (boff = trunc_page(off); boff < end; boff += PAGE_SIZE) {
|
|
pindex = boff >> PAGE_SHIFT;
|
|
vm_page_protect(bp->b_pages[pindex], VM_PROT_NONE);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write using bio
|
|
*/
|
|
int
|
|
nfs_write(ap)
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
register int biosize;
|
|
register struct uio *uio = ap->a_uio;
|
|
struct proc *p = uio->uio_procp;
|
|
register struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
register struct ucred *cred = ap->a_cred;
|
|
int ioflag = ap->a_ioflag;
|
|
struct buf *bp;
|
|
struct vattr vattr;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
daddr_t lbn;
|
|
int bufsize;
|
|
int n, on, error = 0, iomode, must_commit;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_WRITE)
|
|
panic("nfs_write mode");
|
|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
|
|
panic("nfs_write proc");
|
|
#endif
|
|
if (vp->v_type != VREG)
|
|
return (EIO);
|
|
if (np->n_flag & NWRITEERR) {
|
|
np->n_flag &= ~NWRITEERR;
|
|
return (np->n_error);
|
|
}
|
|
if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
|
|
(nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
|
|
(void)nfs_fsinfo(nmp, vp, cred, p);
|
|
if (ioflag & (IO_APPEND | IO_SYNC)) {
|
|
if (np->n_flag & NMODIFIED) {
|
|
np->n_attrstamp = 0;
|
|
error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
if (ioflag & IO_APPEND) {
|
|
np->n_attrstamp = 0;
|
|
error = VOP_GETATTR(vp, &vattr, cred, p);
|
|
if (error)
|
|
return (error);
|
|
uio->uio_offset = np->n_size;
|
|
}
|
|
}
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
|
|
return (EFBIG);
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
/*
|
|
* Maybe this should be above the vnode op call, but so long as
|
|
* file servers have no limits, i don't think it matters
|
|
*/
|
|
if (p && uio->uio_offset + uio->uio_resid >
|
|
p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
|
|
psignal(p, SIGXFSZ);
|
|
return (EFBIG);
|
|
}
|
|
/*
|
|
* I use nm_rsize, not nm_wsize so that all buffer cache blocks
|
|
* will be the same size within a filesystem. nfs_writerpc will
|
|
* still use nm_wsize when sizing the rpc's.
|
|
*/
|
|
biosize = vp->v_mount->mnt_stat.f_iosize;
|
|
do {
|
|
/*
|
|
* Check for a valid write lease.
|
|
*/
|
|
if ((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
NQNFS_CKINVALID(vp, np, ND_WRITE)) {
|
|
do {
|
|
error = nqnfs_getlease(vp, ND_WRITE, cred, p);
|
|
} while (error == NQNFS_EXPIRED);
|
|
if (error)
|
|
return (error);
|
|
if (np->n_lrev != np->n_brev ||
|
|
(np->n_flag & NQNFSNONCACHE)) {
|
|
error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
|
|
if (error)
|
|
return (error);
|
|
np->n_brev = np->n_lrev;
|
|
}
|
|
}
|
|
if ((np->n_flag & NQNFSNONCACHE) && uio->uio_iovcnt == 1) {
|
|
iomode = NFSV3WRITE_FILESYNC;
|
|
error = nfs_writerpc(vp, uio, cred, &iomode, &must_commit);
|
|
if (must_commit)
|
|
nfs_clearcommit(vp->v_mount);
|
|
return (error);
|
|
}
|
|
nfsstats.biocache_writes++;
|
|
lbn = uio->uio_offset / biosize;
|
|
on = uio->uio_offset & (biosize-1);
|
|
n = min((unsigned)(biosize - on), uio->uio_resid);
|
|
again:
|
|
if (uio->uio_offset + n > np->n_size) {
|
|
np->n_size = uio->uio_offset + n;
|
|
np->n_flag |= NMODIFIED;
|
|
vnode_pager_setsize(vp, np->n_size);
|
|
}
|
|
bufsize = biosize;
|
|
if ((lbn + 1) * biosize > np->n_size) {
|
|
bufsize = np->n_size - lbn * biosize;
|
|
bufsize = (bufsize + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
|
|
}
|
|
bp = nfs_getcacheblk(vp, lbn, bufsize, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if (bp->b_wcred == NOCRED) {
|
|
crhold(cred);
|
|
bp->b_wcred = cred;
|
|
}
|
|
np->n_flag |= NMODIFIED;
|
|
|
|
if ((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend > np->n_size) {
|
|
bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
|
|
}
|
|
|
|
/*
|
|
* If the new write will leave a contiguous dirty
|
|
* area, just update the b_dirtyoff and b_dirtyend,
|
|
* otherwise force a write rpc of the old dirty area.
|
|
*/
|
|
if (bp->b_dirtyend > 0 &&
|
|
(on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
|
|
bp->b_proc = p;
|
|
if (VOP_BWRITE(bp) == EINTR)
|
|
return (EINTR);
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Check for valid write lease and get one as required.
|
|
* In case getblk() and/or bwrite() delayed us.
|
|
*/
|
|
if ((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
NQNFS_CKINVALID(vp, np, ND_WRITE)) {
|
|
do {
|
|
error = nqnfs_getlease(vp, ND_WRITE, cred, p);
|
|
} while (error == NQNFS_EXPIRED);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (np->n_lrev != np->n_brev ||
|
|
(np->n_flag & NQNFSNONCACHE)) {
|
|
brelse(bp);
|
|
error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
|
|
if (error)
|
|
return (error);
|
|
np->n_brev = np->n_lrev;
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
bp->b_flags &= ~B_NEEDCOMMIT;
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This will keep the buffer and mmaped regions more coherent.
|
|
*/
|
|
nfs_prot_buf(bp, on, n);
|
|
|
|
if (bp->b_dirtyend > 0) {
|
|
bp->b_dirtyoff = min(on, bp->b_dirtyoff);
|
|
bp->b_dirtyend = max((on + n), bp->b_dirtyend);
|
|
} else {
|
|
bp->b_dirtyoff = on;
|
|
bp->b_dirtyend = on + n;
|
|
}
|
|
if (bp->b_validend == 0 || bp->b_validend < bp->b_dirtyoff ||
|
|
bp->b_validoff > bp->b_dirtyend) {
|
|
bp->b_validoff = bp->b_dirtyoff;
|
|
bp->b_validend = bp->b_dirtyend;
|
|
} else {
|
|
bp->b_validoff = min(bp->b_validoff, bp->b_dirtyoff);
|
|
bp->b_validend = max(bp->b_validend, bp->b_dirtyend);
|
|
}
|
|
|
|
/*
|
|
* Since this block is being modified, it must be written
|
|
* again and not just committed.
|
|
*/
|
|
bp->b_flags &= ~B_NEEDCOMMIT;
|
|
|
|
/*
|
|
* If the lease is non-cachable or IO_SYNC do bwrite().
|
|
*/
|
|
if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) {
|
|
bp->b_proc = p;
|
|
if (ioflag & IO_INVAL)
|
|
bp->b_flags |= B_INVAL;
|
|
error = VOP_BWRITE(bp);
|
|
if (error)
|
|
return (error);
|
|
if (np->n_flag & NQNFSNONCACHE) {
|
|
error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} else if ((n + on) == biosize &&
|
|
(nmp->nm_flag & NFSMNT_NQNFS) == 0) {
|
|
bp->b_proc = (struct proc *)0;
|
|
bp->b_flags |= B_ASYNC;
|
|
(void)nfs_writebp(bp, 0);
|
|
} else
|
|
bdwrite(bp);
|
|
} while (uio->uio_resid > 0 && n > 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Get an nfs cache block.
|
|
* Allocate a new one if the block isn't currently in the cache
|
|
* and return the block marked busy. If the calling process is
|
|
* interrupted by a signal for an interruptible mount point, return
|
|
* NULL.
|
|
*/
|
|
static struct buf *
|
|
nfs_getcacheblk(vp, bn, size, p)
|
|
struct vnode *vp;
|
|
daddr_t bn;
|
|
int size;
|
|
struct proc *p;
|
|
{
|
|
register struct buf *bp;
|
|
struct mount *mp;
|
|
struct nfsmount *nmp;
|
|
|
|
mp = vp->v_mount;
|
|
nmp = VFSTONFS(mp);
|
|
|
|
if (nmp->nm_flag & NFSMNT_INT) {
|
|
bp = getblk(vp, bn, size, PCATCH, 0);
|
|
while (bp == (struct buf *)0) {
|
|
if (nfs_sigintr(nmp, (struct nfsreq *)0, p))
|
|
return ((struct buf *)0);
|
|
bp = getblk(vp, bn, size, 0, 2 * hz);
|
|
}
|
|
} else
|
|
bp = getblk(vp, bn, size, 0, 0);
|
|
|
|
if( vp->v_type == VREG) {
|
|
int biosize;
|
|
biosize = mp->mnt_stat.f_iosize;
|
|
bp->b_blkno = (bn * biosize) / DEV_BSIZE;
|
|
}
|
|
|
|
return (bp);
|
|
}
|
|
|
|
/*
|
|
* Flush and invalidate all dirty buffers. If another process is already
|
|
* doing the flush, just wait for completion.
|
|
*/
|
|
int
|
|
nfs_vinvalbuf(vp, flags, cred, p, intrflg)
|
|
struct vnode *vp;
|
|
int flags;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
int intrflg;
|
|
{
|
|
register struct nfsnode *np = VTONFS(vp);
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
int error = 0, slpflag, slptimeo;
|
|
|
|
if (vp->v_flag & VXLOCK) {
|
|
return (0);
|
|
}
|
|
|
|
if ((nmp->nm_flag & NFSMNT_INT) == 0)
|
|
intrflg = 0;
|
|
if (intrflg) {
|
|
slpflag = PCATCH;
|
|
slptimeo = 2 * hz;
|
|
} else {
|
|
slpflag = 0;
|
|
slptimeo = 0;
|
|
}
|
|
/*
|
|
* First wait for any other process doing a flush to complete.
|
|
*/
|
|
while (np->n_flag & NFLUSHINPROG) {
|
|
np->n_flag |= NFLUSHWANT;
|
|
error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "nfsvinval",
|
|
slptimeo);
|
|
if (error && intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p))
|
|
return (EINTR);
|
|
}
|
|
|
|
/*
|
|
* Now, flush as required.
|
|
*/
|
|
np->n_flag |= NFLUSHINPROG;
|
|
error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
|
|
while (error) {
|
|
if (intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
|
|
np->n_flag &= ~NFLUSHINPROG;
|
|
if (np->n_flag & NFLUSHWANT) {
|
|
np->n_flag &= ~NFLUSHWANT;
|
|
wakeup((caddr_t)&np->n_flag);
|
|
}
|
|
return (EINTR);
|
|
}
|
|
error = vinvalbuf(vp, flags, cred, p, 0, slptimeo);
|
|
}
|
|
np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
|
|
if (np->n_flag & NFLUSHWANT) {
|
|
np->n_flag &= ~NFLUSHWANT;
|
|
wakeup((caddr_t)&np->n_flag);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initiate asynchronous I/O. Return an error if no nfsiods are available.
|
|
* This is mainly to avoid queueing async I/O requests when the nfsiods
|
|
* are all hung on a dead server.
|
|
*/
|
|
int
|
|
nfs_asyncio(bp, cred)
|
|
register struct buf *bp;
|
|
struct ucred *cred;
|
|
{
|
|
struct nfsmount *nmp;
|
|
int i;
|
|
int gotiod;
|
|
int slpflag = 0;
|
|
int slptimeo = 0;
|
|
int error;
|
|
|
|
if (nfs_numasync == 0)
|
|
return (EIO);
|
|
|
|
nmp = VFSTONFS(bp->b_vp->v_mount);
|
|
again:
|
|
if (nmp->nm_flag & NFSMNT_INT)
|
|
slpflag = PCATCH;
|
|
gotiod = FALSE;
|
|
|
|
/*
|
|
* Find a free iod to process this request.
|
|
*/
|
|
for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
|
|
if (nfs_iodwant[i]) {
|
|
/*
|
|
* Found one, so wake it up and tell it which
|
|
* mount to process.
|
|
*/
|
|
NFS_DPF(ASYNCIO,
|
|
("nfs_asyncio: waking iod %d for mount %p\n",
|
|
i, nmp));
|
|
nfs_iodwant[i] = (struct proc *)0;
|
|
nfs_iodmount[i] = nmp;
|
|
nmp->nm_bufqiods++;
|
|
wakeup((caddr_t)&nfs_iodwant[i]);
|
|
gotiod = TRUE;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If none are free, we may already have an iod working on this mount
|
|
* point. If so, it will process our request.
|
|
*/
|
|
if (!gotiod) {
|
|
if (nmp->nm_bufqiods > 0) {
|
|
NFS_DPF(ASYNCIO,
|
|
("nfs_asyncio: %d iods are already processing mount %p\n",
|
|
nmp->nm_bufqiods, nmp));
|
|
gotiod = TRUE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we have an iod which can process the request, then queue
|
|
* the buffer.
|
|
*/
|
|
if (gotiod) {
|
|
/*
|
|
* Ensure that the queue never grows too large.
|
|
*/
|
|
while (nmp->nm_bufqlen >= 2*nfs_numasync) {
|
|
NFS_DPF(ASYNCIO,
|
|
("nfs_asyncio: waiting for mount %p queue to drain\n", nmp));
|
|
nmp->nm_bufqwant = TRUE;
|
|
error = tsleep(&nmp->nm_bufq, slpflag | PRIBIO,
|
|
"nfsaio", slptimeo);
|
|
if (error) {
|
|
if (nfs_sigintr(nmp, NULL, bp->b_proc))
|
|
return (EINTR);
|
|
if (slpflag == PCATCH) {
|
|
slpflag = 0;
|
|
slptimeo = 2 * hz;
|
|
}
|
|
}
|
|
/*
|
|
* We might have lost our iod while sleeping,
|
|
* so check and loop if nescessary.
|
|
*/
|
|
if (nmp->nm_bufqiods == 0) {
|
|
NFS_DPF(ASYNCIO,
|
|
("nfs_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
if (bp->b_flags & B_READ) {
|
|
if (bp->b_rcred == NOCRED && cred != NOCRED) {
|
|
crhold(cred);
|
|
bp->b_rcred = cred;
|
|
}
|
|
} else {
|
|
bp->b_flags |= B_WRITEINPROG;
|
|
if (bp->b_wcred == NOCRED && cred != NOCRED) {
|
|
crhold(cred);
|
|
bp->b_wcred = cred;
|
|
}
|
|
}
|
|
|
|
TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
|
|
nmp->nm_bufqlen++;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* All the iods are busy on other mounts, so return EIO to
|
|
* force the caller to process the i/o synchronously.
|
|
*/
|
|
NFS_DPF(ASYNCIO, ("nfs_asyncio: no iods available, i/o is synchronous\n"));
|
|
return (EIO);
|
|
}
|
|
|
|
/*
|
|
* Do an I/O operation to/from a cache block. This may be called
|
|
* synchronously or from an nfsiod.
|
|
*/
|
|
int
|
|
nfs_doio(bp, cr, p)
|
|
register struct buf *bp;
|
|
struct ucred *cr;
|
|
struct proc *p;
|
|
{
|
|
register struct uio *uiop;
|
|
register struct vnode *vp;
|
|
struct nfsnode *np;
|
|
struct nfsmount *nmp;
|
|
int error = 0, diff, len, iomode, must_commit = 0;
|
|
struct uio uio;
|
|
struct iovec io;
|
|
|
|
vp = bp->b_vp;
|
|
np = VTONFS(vp);
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
uiop = &uio;
|
|
uiop->uio_iov = &io;
|
|
uiop->uio_iovcnt = 1;
|
|
uiop->uio_segflg = UIO_SYSSPACE;
|
|
uiop->uio_procp = p;
|
|
|
|
/*
|
|
* Historically, paging was done with physio, but no more.
|
|
*/
|
|
if (bp->b_flags & B_PHYS) {
|
|
/*
|
|
* ...though reading /dev/drum still gets us here.
|
|
*/
|
|
io.iov_len = uiop->uio_resid = bp->b_bcount;
|
|
/* mapping was done by vmapbuf() */
|
|
io.iov_base = bp->b_data;
|
|
uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
|
|
if (bp->b_flags & B_READ) {
|
|
uiop->uio_rw = UIO_READ;
|
|
nfsstats.read_physios++;
|
|
error = nfs_readrpc(vp, uiop, cr);
|
|
} else {
|
|
int com;
|
|
|
|
iomode = NFSV3WRITE_DATASYNC;
|
|
uiop->uio_rw = UIO_WRITE;
|
|
nfsstats.write_physios++;
|
|
error = nfs_writerpc(vp, uiop, cr, &iomode, &com);
|
|
}
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
bp->b_error = error;
|
|
}
|
|
} else if (bp->b_flags & B_READ) {
|
|
io.iov_len = uiop->uio_resid = bp->b_bcount;
|
|
io.iov_base = bp->b_data;
|
|
uiop->uio_rw = UIO_READ;
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
|
|
nfsstats.read_bios++;
|
|
error = nfs_readrpc(vp, uiop, cr);
|
|
if (!error) {
|
|
bp->b_validoff = 0;
|
|
if (uiop->uio_resid) {
|
|
/*
|
|
* If len > 0, there is a hole in the file and
|
|
* no writes after the hole have been pushed to
|
|
* the server yet.
|
|
* Just zero fill the rest of the valid area.
|
|
*/
|
|
diff = bp->b_bcount - uiop->uio_resid;
|
|
len = np->n_size - (((u_quad_t)bp->b_blkno) * DEV_BSIZE
|
|
+ diff);
|
|
if (len > 0) {
|
|
len = min(len, uiop->uio_resid);
|
|
bzero((char *)bp->b_data + diff, len);
|
|
bp->b_validend = diff + len;
|
|
} else
|
|
bp->b_validend = diff;
|
|
} else
|
|
bp->b_validend = bp->b_bcount;
|
|
}
|
|
if (p && (vp->v_flag & VTEXT) &&
|
|
(((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
NQNFS_CKINVALID(vp, np, ND_READ) &&
|
|
np->n_lrev != np->n_brev) ||
|
|
(!(nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
np->n_mtime != np->n_vattr.va_mtime.tv_sec))) {
|
|
uprintf("Process killed due to text file modification\n");
|
|
psignal(p, SIGKILL);
|
|
p->p_flag |= P_NOSWAP;
|
|
}
|
|
break;
|
|
case VLNK:
|
|
uiop->uio_offset = (off_t)0;
|
|
nfsstats.readlink_bios++;
|
|
error = nfs_readlinkrpc(vp, uiop, cr);
|
|
break;
|
|
case VDIR:
|
|
nfsstats.readdir_bios++;
|
|
uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
|
|
if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
|
|
error = nfs_readdirplusrpc(vp, uiop, cr);
|
|
if (error == NFSERR_NOTSUPP)
|
|
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
|
|
}
|
|
if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
|
|
error = nfs_readdirrpc(vp, uiop, cr);
|
|
if (error == 0 && uiop->uio_resid == bp->b_bcount)
|
|
bp->b_flags |= B_INVAL;
|
|
break;
|
|
default:
|
|
printf("nfs_doio: type %x unexpected\n",vp->v_type);
|
|
break;
|
|
};
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
bp->b_error = error;
|
|
}
|
|
} else {
|
|
if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
|
|
bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
|
|
|
|
if (bp->b_dirtyend > bp->b_dirtyoff) {
|
|
io.iov_len = uiop->uio_resid = bp->b_dirtyend
|
|
- bp->b_dirtyoff;
|
|
uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE
|
|
+ bp->b_dirtyoff;
|
|
io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
|
|
uiop->uio_rw = UIO_WRITE;
|
|
nfsstats.write_bios++;
|
|
if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
|
|
iomode = NFSV3WRITE_UNSTABLE;
|
|
else
|
|
iomode = NFSV3WRITE_FILESYNC;
|
|
bp->b_flags |= B_WRITEINPROG;
|
|
error = nfs_writerpc(vp, uiop, cr, &iomode, &must_commit);
|
|
if (!error && iomode == NFSV3WRITE_UNSTABLE) {
|
|
bp->b_flags |= B_NEEDCOMMIT;
|
|
if (bp->b_dirtyoff == 0
|
|
&& bp->b_dirtyend == bp->b_bufsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
} else
|
|
bp->b_flags &= ~B_NEEDCOMMIT;
|
|
bp->b_flags &= ~B_WRITEINPROG;
|
|
|
|
/*
|
|
* For an interrupted write, the buffer is still valid
|
|
* and the write hasn't been pushed to the server yet,
|
|
* so we can't set B_ERROR and report the interruption
|
|
* by setting B_EINTR. For the B_ASYNC case, B_EINTR
|
|
* is not relevant, so the rpc attempt is essentially
|
|
* a noop. For the case of a V3 write rpc not being
|
|
* committed to stable storage, the block is still
|
|
* dirty and requires either a commit rpc or another
|
|
* write rpc with iomode == NFSV3WRITE_FILESYNC before
|
|
* the block is reused. This is indicated by setting
|
|
* the B_DELWRI and B_NEEDCOMMIT flags.
|
|
*/
|
|
if (error == EINTR
|
|
|| (!error && (bp->b_flags & B_NEEDCOMMIT))) {
|
|
int s;
|
|
|
|
bp->b_flags &= ~(B_INVAL|B_NOCACHE);
|
|
++numdirtybuffers;
|
|
bp->b_flags |= B_DELWRI;
|
|
s = splbio();
|
|
reassignbuf(bp, vp);
|
|
splx(s);
|
|
if ((bp->b_flags & B_ASYNC) == 0)
|
|
bp->b_flags |= B_EINTR;
|
|
} else {
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
bp->b_error = np->n_error = error;
|
|
np->n_flag |= NWRITEERR;
|
|
}
|
|
bp->b_dirtyoff = bp->b_dirtyend = 0;
|
|
}
|
|
} else {
|
|
bp->b_resid = 0;
|
|
biodone(bp);
|
|
return (0);
|
|
}
|
|
}
|
|
bp->b_resid = uiop->uio_resid;
|
|
if (must_commit)
|
|
nfs_clearcommit(vp->v_mount);
|
|
biodone(bp);
|
|
return (error);
|
|
}
|