The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nwfs/nwfs_io.c

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    1 /*-
    2  * Copyright (c) 1999, Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/5.4/sys/fs/nwfs/nwfs_io.c 141090 2005-01-31 23:27:04Z imp $
   33  *
   34  */
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/resourcevar.h>    /* defines plimit structure in proc struct */
   38 #include <sys/kernel.h>
   39 #include <sys/bio.h>
   40 #include <sys/buf.h>
   41 #include <sys/proc.h>
   42 #include <sys/mount.h>
   43 #include <sys/namei.h>
   44 #include <sys/vnode.h>
   45 #include <sys/dirent.h>
   46 #include <sys/signalvar.h>
   47 #include <sys/sysctl.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_page.h>
   51 #include <vm/vm_extern.h>
   52 #include <vm/vm_object.h>
   53 #include <vm/vm_pager.h>
   54 #include <vm/vnode_pager.h>
   55 
   56 #include <netncp/ncp.h>
   57 #include <netncp/ncp_conn.h>
   58 #include <netncp/ncp_subr.h>
   59 #include <netncp/ncp_ncp.h>
   60 
   61 #include <fs/nwfs/nwfs.h>
   62 #include <fs/nwfs/nwfs_node.h>
   63 #include <fs/nwfs/nwfs_subr.h>
   64 
   65 static int nwfs_fastlookup = 1;
   66 
   67 SYSCTL_DECL(_vfs_nwfs);
   68 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, "");
   69 
   70 
   71 extern int nwfs_pbuf_freecnt;
   72 
   73 #define DE_SIZE (sizeof(struct dirent))
   74 #define NWFS_RWCACHE
   75 
   76 static int
   77 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
   78         struct nwmount *nmp = VTONWFS(vp);
   79         int error, count, i;
   80         struct dirent dp;
   81         struct nwnode *np = VTONW(vp);
   82         struct nw_entry_info fattr;
   83         struct vnode *newvp;
   84         struct componentname cn;
   85         ncpfid fid;
   86 
   87         np = VTONW(vp);
   88         NCPVNDEBUG("dirname='%s'\n",np->n_name);
   89         if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0))
   90                 return (EINVAL);
   91         error = 0;
   92         count = 0;
   93         i = uio->uio_offset / DE_SIZE; /* offset in directory */
   94         if (i == 0) {
   95                 error = ncp_initsearch(vp, uio->uio_td, cred);
   96                 if (error) {
   97                         NCPVNDEBUG("cannot initialize search, error=%d",error);
   98                         return( error );
   99                 }
  100         }
  101 
  102         for (; uio->uio_resid >= DE_SIZE; i++) {
  103                 bzero((char *) &dp, DE_SIZE);
  104                 dp.d_reclen = DE_SIZE;
  105                 switch (i) {
  106                     case 0:             /* `.' */
  107                     case 1:             /* `..' */
  108                         dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id;
  109                         if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO;
  110                         dp.d_namlen = i + 1;
  111                         dp.d_name[0] = '.';
  112                         dp.d_name[1] = '.';
  113                         dp.d_name[i + 1] = '\0';
  114                         dp.d_type = DT_DIR;
  115                         break;
  116                     default:
  117                         error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred);
  118                         if (error && error < 0x80) break;
  119                         dp.d_fileno = fattr.dirEntNum;
  120                         dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG;
  121                         dp.d_namlen = fattr.nameLen;
  122                         bcopy(fattr.entryName, dp.d_name, dp.d_namlen);
  123                         dp.d_name[dp.d_namlen] = '\0';
  124 #if 0
  125                         if (error && eofflag) {
  126                         /*      *eofflag = 1;*/
  127                                 break;
  128                         }
  129 #endif
  130                         break;
  131                 }
  132                 if (nwfs_fastlookup && !error && i > 1) {
  133                         fid.f_id = fattr.dirEntNum;
  134                         fid.f_parent = np->n_fid.f_id;
  135                         error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp);
  136                         if (!error) {
  137                                 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
  138                                 cn.cn_nameptr = dp.d_name;
  139                                 cn.cn_namelen = dp.d_namlen;
  140                                 cache_enter(vp, newvp, &cn);
  141                                 vput(newvp);
  142                         } else
  143                                 error = 0;
  144                 }
  145                 if (error >= 0x80) {
  146                     error = 0;
  147                     break;
  148                 }
  149                 if ((error = uiomove(&dp, DE_SIZE, uio)))
  150                         break;
  151         }
  152 
  153         uio->uio_offset = i * DE_SIZE;
  154         return (error);
  155 }
  156 
  157 int
  158 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) {
  159         struct nwmount *nmp = VFSTONWFS(vp->v_mount);
  160         struct nwnode *np = VTONW(vp);
  161         struct thread *td;
  162         struct vattr vattr;
  163         int error, biosize;
  164 
  165         if (vp->v_type != VREG && vp->v_type != VDIR) {
  166                 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__);
  167                 return EIO;
  168         }
  169         if (uiop->uio_resid == 0) return 0;
  170         if (uiop->uio_offset < 0) return EINVAL;
  171 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
  172                 return (EFBIG);*/
  173         td = uiop->uio_td;
  174         if (vp->v_type == VDIR) {
  175                 error = nwfs_readvdir(vp, uiop, cred);
  176                 return error;
  177         }
  178         biosize = NWFSTOCONN(nmp)->buffer_size;
  179         if (np->n_flag & NMODIFIED) {
  180                 nwfs_attr_cacheremove(vp);
  181                 error = VOP_GETATTR(vp, &vattr, cred, td);
  182                 if (error) return (error);
  183                 np->n_mtime = vattr.va_mtime.tv_sec;
  184         } else {
  185                 error = VOP_GETATTR(vp, &vattr, cred, td);
  186                 if (error) return (error);
  187                 if (np->n_mtime != vattr.va_mtime.tv_sec) {
  188                         error = nwfs_vinvalbuf(vp, V_SAVE, cred, td, 1);
  189                         if (error) return (error);
  190                         np->n_mtime = vattr.va_mtime.tv_sec;
  191                 }
  192         }
  193         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop,cred);
  194         return (error);
  195 }
  196 
  197 int
  198 nwfs_writevnode(vp, uiop, cred, ioflag)
  199         struct vnode *vp;
  200         struct uio *uiop;
  201         struct ucred *cred;
  202         int ioflag;
  203 {
  204         struct nwmount *nmp = VTONWFS(vp);
  205         struct nwnode *np = VTONW(vp);
  206         struct thread *td;
  207 /*      struct vattr vattr;*/
  208         int error = 0;
  209 
  210         if (vp->v_type != VREG) {
  211                 printf("%s: vn types other than VREG unsupported !\n",__func__);
  212                 return EIO;
  213         }
  214         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  215         if (uiop->uio_offset < 0) return EINVAL;
  216 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
  217                 return (EFBIG);*/
  218         td = uiop->uio_td;
  219         if (ioflag & (IO_APPEND | IO_SYNC)) {
  220                 if (np->n_flag & NMODIFIED) {
  221                         nwfs_attr_cacheremove(vp);
  222                         error = nwfs_vinvalbuf(vp, V_SAVE, cred, td, 1);
  223                         if (error) return (error);
  224                 }
  225                 if (ioflag & IO_APPEND) {
  226                 /* We can relay only on local information about file size,
  227                  * because until file is closed NetWare will not return
  228                  * the correct size. */
  229 #if notyet
  230                         nwfs_attr_cacheremove(vp);
  231                         error = VOP_GETATTR(vp, &vattr, cred, td);
  232                         if (error) return (error);
  233 #endif
  234                         uiop->uio_offset = np->n_size;
  235                 }
  236         }
  237         if (uiop->uio_resid == 0) return 0;
  238         if (td != NULL) {
  239                 PROC_LOCK(td->td_proc);
  240                 if  (uiop->uio_offset + uiop->uio_resid >
  241                     lim_cur(td->td_proc, RLIMIT_FSIZE)) {
  242                         psignal(td->td_proc, SIGXFSZ);
  243                         PROC_UNLOCK(td->td_proc);
  244                         return (EFBIG);
  245                 }
  246                 PROC_UNLOCK(td->td_proc);
  247         }
  248         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
  249         NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  250         if (!error) {
  251                 if (uiop->uio_offset > np->n_size) {
  252                         np->n_vattr.va_size = np->n_size = uiop->uio_offset;
  253                         vnode_pager_setsize(vp, np->n_size);
  254                 }
  255         }
  256         return (error);
  257 }
  258 
  259 /*
  260  * Do an I/O operation to/from a cache block.
  261  */
  262 int
  263 nwfs_doio(bp, cr, td)
  264         struct buf *bp;
  265         struct ucred *cr;
  266         struct thread *td;
  267 {
  268         struct uio *uiop;
  269         struct vnode *vp;
  270         struct nwnode *np;
  271         struct nwmount *nmp;
  272         int error = 0;
  273         struct uio uio;
  274         struct iovec io;
  275 
  276         vp = bp->b_vp;
  277         np = VTONW(vp);
  278         nmp = VFSTONWFS(vp->v_mount);
  279         uiop = &uio;
  280         uiop->uio_iov = &io;
  281         uiop->uio_iovcnt = 1;
  282         uiop->uio_segflg = UIO_SYSSPACE;
  283         uiop->uio_td = td;
  284         if (bp->b_iocmd == BIO_READ) {
  285             io.iov_len = uiop->uio_resid = bp->b_bcount;
  286             io.iov_base = bp->b_data;
  287             uiop->uio_rw = UIO_READ;
  288             switch (vp->v_type) {
  289               case VREG:
  290                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  291                 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  292                 if (error)
  293                         break;
  294                 if (uiop->uio_resid) {
  295                         int left = uiop->uio_resid;
  296                         int nread = bp->b_bcount - left;
  297                         if (left > 0)
  298                             bzero((char *)bp->b_data + nread, left);
  299                 }
  300                 break;
  301 /*          case VDIR:
  302                 nfsstats.readdir_bios++;
  303                 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
  304                 if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
  305                         error = nfs_readdirplusrpc(vp, uiop, cr);
  306                         if (error == NFSERR_NOTSUPP)
  307                                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  308                 }
  309                 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
  310                         error = nfs_readdirrpc(vp, uiop, cr);
  311                 if (error == 0 && uiop->uio_resid == bp->b_bcount)
  312                         bp->b_flags |= B_INVAL;
  313                 break;
  314 */
  315             default:
  316                 printf("nwfs_doio:  type %x unexpected\n",vp->v_type);
  317                 break;
  318             };
  319             if (error) {
  320                 bp->b_ioflags |= BIO_ERROR;
  321                 bp->b_error = error;
  322             }
  323         } else { /* write */
  324             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  325                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  326 
  327             if (bp->b_dirtyend > bp->b_dirtyoff) {
  328                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  329                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  330                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  331                 uiop->uio_rw = UIO_WRITE;
  332                 bp->b_flags |= B_WRITEINPROG;
  333                 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  334                 bp->b_flags &= ~B_WRITEINPROG;
  335 
  336                 /*
  337                  * For an interrupted write, the buffer is still valid
  338                  * and the write hasn't been pushed to the server yet,
  339                  * so we can't set BIO_ERROR and report the interruption
  340                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  341                  * is not relevant, so the rpc attempt is essentially
  342                  * a noop.  For the case of a V3 write rpc not being
  343                  * committed to stable storage, the block is still
  344                  * dirty and requires either a commit rpc or another
  345                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  346                  * the block is reused. This is indicated by setting
  347                  * the B_DELWRI and B_NEEDCOMMIT flags.
  348                  */
  349                 if (error == EINTR
  350                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  351                         int s;
  352 
  353                         s = splbio();
  354                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  355                         if ((bp->b_flags & B_ASYNC) == 0)
  356                             bp->b_flags |= B_EINTR;
  357                         if ((bp->b_flags & B_PAGING) == 0) {
  358                             bdirty(bp);
  359                             bp->b_flags &= ~B_DONE;
  360                         }
  361                         if ((bp->b_flags & B_ASYNC) == 0)
  362                             bp->b_flags |= B_EINTR;
  363                         splx(s);
  364                 } else {
  365                         if (error) {
  366                                 bp->b_ioflags |= BIO_ERROR;
  367                                 bp->b_error /*= np->n_error */= error;
  368 /*                              np->n_flag |= NWRITEERR;*/
  369                         }
  370                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  371                 }
  372             } else {
  373                 bp->b_resid = 0;
  374                 bufdone(bp);
  375                 return (0);
  376             }
  377         }
  378         bp->b_resid = uiop->uio_resid;
  379         bufdone(bp);
  380         return (error);
  381 }
  382 
  383 /*
  384  * Vnode op for VM getpages.
  385  * Wish wish .... get rid from multiple IO routines
  386  */
  387 int
  388 nwfs_getpages(ap)
  389         struct vop_getpages_args /* {
  390                 struct vnode *a_vp;
  391                 vm_page_t *a_m;
  392                 int a_count;
  393                 int a_reqpage;
  394                 vm_ooffset_t a_offset;
  395         } */ *ap;
  396 {
  397 #ifndef NWFS_RWCACHE
  398         return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count,
  399 #else
  400         int i, error, nextoff, size, toff, npages, count;
  401         struct uio uio;
  402         struct iovec iov;
  403         vm_offset_t kva;
  404         struct buf *bp;
  405         struct vnode *vp;
  406         struct thread *td;
  407         struct ucred *cred;
  408         struct nwmount *nmp;
  409         struct nwnode *np;
  410         vm_object_t object;
  411         vm_page_t *pages;
  412 
  413         vp = ap->a_vp;
  414         td = curthread;                 /* XXX */
  415         cred = td->td_ucred;            /* XXX */
  416         np = VTONW(vp);
  417         nmp = VFSTONWFS(vp->v_mount);
  418         pages = ap->a_m;
  419         count = ap->a_count;
  420 
  421         if ((object = vp->v_object) == NULL) {
  422                 printf("nwfs_getpages: called with non-merged cache vnode??\n");
  423                 return VM_PAGER_ERROR;
  424         }
  425 
  426         bp = getpbuf(&nwfs_pbuf_freecnt);
  427         npages = btoc(count);
  428         kva = (vm_offset_t) bp->b_data;
  429         pmap_qenter(kva, pages, npages);
  430 
  431         iov.iov_base = (caddr_t) kva;
  432         iov.iov_len = count;
  433         uio.uio_iov = &iov;
  434         uio.uio_iovcnt = 1;
  435         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  436         uio.uio_resid = count;
  437         uio.uio_segflg = UIO_SYSSPACE;
  438         uio.uio_rw = UIO_READ;
  439         uio.uio_td = td;
  440 
  441         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
  442         pmap_qremove(kva, npages);
  443 
  444         relpbuf(bp, &nwfs_pbuf_freecnt);
  445 
  446         VM_OBJECT_LOCK(object);
  447         if (error && (uio.uio_resid == count)) {
  448                 printf("nwfs_getpages: error %d\n",error);
  449                 vm_page_lock_queues();
  450                 for (i = 0; i < npages; i++) {
  451                         if (ap->a_reqpage != i)
  452                                 vm_page_free(pages[i]);
  453                 }
  454                 vm_page_unlock_queues();
  455                 VM_OBJECT_UNLOCK(object);
  456                 return VM_PAGER_ERROR;
  457         }
  458 
  459         size = count - uio.uio_resid;
  460 
  461         vm_page_lock_queues();
  462         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  463                 vm_page_t m;
  464                 nextoff = toff + PAGE_SIZE;
  465                 m = pages[i];
  466 
  467                 if (nextoff <= size) {
  468                         m->valid = VM_PAGE_BITS_ALL;
  469                         m->dirty = 0;
  470                 } else {
  471                         int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
  472                         vm_page_set_validclean(m, 0, nvalid);
  473                 }
  474 
  475                 if (i != ap->a_reqpage) {
  476                         /*
  477                          * Whether or not to leave the page activated is up in
  478                          * the air, but we should put the page on a page queue
  479                          * somewhere (it already is in the object).  Result:
  480                          * It appears that emperical results show that
  481                          * deactivating pages is best.
  482                          */
  483 
  484                         /*
  485                          * Just in case someone was asking for this page we
  486                          * now tell them that it is ok to use.
  487                          */
  488                         if (!error) {
  489                                 if (m->flags & PG_WANTED)
  490                                         vm_page_activate(m);
  491                                 else
  492                                         vm_page_deactivate(m);
  493                                 vm_page_wakeup(m);
  494                         } else {
  495                                 vm_page_free(m);
  496                         }
  497                 }
  498         }
  499         vm_page_unlock_queues();
  500         VM_OBJECT_UNLOCK(object);
  501         return 0;
  502 #endif /* NWFS_RWCACHE */
  503 }
  504 
  505 /*
  506  * Vnode op for VM putpages.
  507  * possible bug: all IO done in sync mode
  508  * Note that vop_close always invalidate pages before close, so it's
  509  * not necessary to open vnode.
  510  */
  511 int
  512 nwfs_putpages(ap)
  513         struct vop_putpages_args /* {
  514                 struct vnode *a_vp;
  515                 vm_page_t *a_m;
  516                 int a_count;
  517                 int a_sync;
  518                 int *a_rtvals;
  519                 vm_ooffset_t a_offset;
  520         } */ *ap;
  521 {
  522         int error;
  523         struct vnode *vp = ap->a_vp;
  524         struct thread *td;
  525         struct ucred *cred;
  526 
  527 #ifndef NWFS_RWCACHE
  528         td = curthread;                 /* XXX */
  529         cred = td->td_ucred;            /* XXX */
  530         VOP_OPEN(vp, FWRITE, cred, td, -1);
  531         error = vop_stdputpages(ap);
  532         VOP_CLOSE(vp, FWRITE, cred, td);
  533         return error;
  534 #else
  535         struct uio uio;
  536         struct iovec iov;
  537         vm_offset_t kva;
  538         struct buf *bp;
  539         int i, npages, count;
  540         int *rtvals;
  541         struct nwmount *nmp;
  542         struct nwnode *np;
  543         vm_page_t *pages;
  544 
  545         td = curthread;                 /* XXX */
  546         cred = td->td_ucred;            /* XXX */
  547 /*      VOP_OPEN(vp, FWRITE, cred, td, -1);*/
  548         np = VTONW(vp);
  549         nmp = VFSTONWFS(vp->v_mount);
  550         pages = ap->a_m;
  551         count = ap->a_count;
  552         rtvals = ap->a_rtvals;
  553         npages = btoc(count);
  554 
  555         for (i = 0; i < npages; i++) {
  556                 rtvals[i] = VM_PAGER_AGAIN;
  557         }
  558 
  559         bp = getpbuf(&nwfs_pbuf_freecnt);
  560         kva = (vm_offset_t) bp->b_data;
  561         pmap_qenter(kva, pages, npages);
  562 
  563         iov.iov_base = (caddr_t) kva;
  564         iov.iov_len = count;
  565         uio.uio_iov = &iov;
  566         uio.uio_iovcnt = 1;
  567         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  568         uio.uio_resid = count;
  569         uio.uio_segflg = UIO_SYSSPACE;
  570         uio.uio_rw = UIO_WRITE;
  571         uio.uio_td = td;
  572         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
  573 
  574         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
  575 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  576         NCPVNDEBUG("paged write done: %d\n", error);
  577 
  578         pmap_qremove(kva, npages);
  579         relpbuf(bp, &nwfs_pbuf_freecnt);
  580 
  581         if (!error) {
  582                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
  583                 vm_page_lock_queues();
  584                 for (i = 0; i < nwritten; i++) {
  585                         rtvals[i] = VM_PAGER_OK;
  586                         vm_page_undirty(pages[i]);
  587                 }
  588                 vm_page_unlock_queues();
  589         }
  590         return rtvals[0];
  591 #endif /* NWFS_RWCACHE */
  592 }
  593 /*
  594  * Flush and invalidate all dirty buffers. If another process is already
  595  * doing the flush, just wait for completion.
  596  */
  597 int
  598 nwfs_vinvalbuf(vp, flags, cred, td, intrflg)
  599         struct vnode *vp;
  600         int flags;
  601         struct ucred *cred;
  602         struct thread *td;
  603         int intrflg;
  604 {
  605         struct nwnode *np = VTONW(vp);
  606 /*      struct nwmount *nmp = VTONWFS(vp);*/
  607         int error = 0, slpflag, slptimeo;
  608 
  609         if (vp->v_iflag & VI_XLOCK)
  610                 return (0);
  611 
  612         if (intrflg) {
  613                 slpflag = PCATCH;
  614                 slptimeo = 2 * hz;
  615         } else {
  616                 slpflag = 0;
  617                 slptimeo = 0;
  618         }
  619         while (np->n_flag & NFLUSHINPROG) {
  620                 np->n_flag |= NFLUSHWANT;
  621                 error = tsleep(&np->n_flag, PRIBIO + 2, "nwfsvinv", slptimeo);
  622                 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), td);
  623                 if (error == EINTR && intrflg)
  624                         return EINTR;
  625         }
  626         np->n_flag |= NFLUSHINPROG;
  627         error = vinvalbuf(vp, flags, cred, td, slpflag, 0);
  628         while (error) {
  629                 if (intrflg && (error == ERESTART || error == EINTR)) {
  630                         np->n_flag &= ~NFLUSHINPROG;
  631                         if (np->n_flag & NFLUSHWANT) {
  632                                 np->n_flag &= ~NFLUSHWANT;
  633                                 wakeup(&np->n_flag);
  634                         }
  635                         return EINTR;
  636                 }
  637                 error = vinvalbuf(vp, flags, cred, td, slpflag, 0);
  638         }
  639         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  640         if (np->n_flag & NFLUSHWANT) {
  641                 np->n_flag &= ~NFLUSHWANT;
  642                 wakeup(&np->n_flag);
  643         }
  644         return (error);
  645 }

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