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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/9.2/sys/fs/nwfs/nwfs_io.c 240238 2012-09-08 16:40:18Z kib $
   27  *
   28  */
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <sys/bio.h>
   33 #include <sys/buf.h>
   34 #include <sys/mount.h>
   35 #include <sys/namei.h>
   36 #include <sys/vnode.h>
   37 #include <sys/dirent.h>
   38 #include <sys/sysctl.h>
   39 
   40 #include <vm/vm.h>
   41 #include <vm/vm_param.h>
   42 #include <vm/vm_page.h>
   43 #include <vm/vm_extern.h>
   44 #include <vm/vm_object.h>
   45 #include <vm/vm_pager.h>
   46 #include <vm/vnode_pager.h>
   47 
   48 #include <netncp/ncp.h>
   49 #include <netncp/ncp_conn.h>
   50 #include <netncp/ncp_subr.h>
   51 #include <netncp/ncp_ncp.h>
   52 
   53 #include <fs/nwfs/nwfs.h>
   54 #include <fs/nwfs/nwfs_node.h>
   55 #include <fs/nwfs/nwfs_subr.h>
   56 
   57 static int nwfs_fastlookup = 1;
   58 
   59 SYSCTL_DECL(_vfs_nwfs);
   60 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, "");
   61 
   62 
   63 extern int nwfs_pbuf_freecnt;
   64 
   65 #define DE_SIZE (sizeof(struct dirent))
   66 #define NWFS_RWCACHE
   67 
   68 static int
   69 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
   70         struct nwmount *nmp = VTONWFS(vp);
   71         int error, count, i;
   72         struct dirent dp;
   73         struct nwnode *np = VTONW(vp);
   74         struct nw_entry_info fattr;
   75         struct vnode *newvp;
   76         struct componentname cn;
   77         ncpfid fid;
   78 
   79         np = VTONW(vp);
   80         NCPVNDEBUG("dirname='%s'\n",np->n_name);
   81         if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0))
   82                 return (EINVAL);
   83         error = 0;
   84         count = 0;
   85         i = uio->uio_offset / DE_SIZE; /* offset in directory */
   86         if (i == 0) {
   87                 error = ncp_initsearch(vp, uio->uio_td, cred);
   88                 if (error) {
   89                         NCPVNDEBUG("cannot initialize search, error=%d",error);
   90                         return( error );
   91                 }
   92         }
   93 
   94         for (; uio->uio_resid >= DE_SIZE; i++) {
   95                 bzero((char *) &dp, DE_SIZE);
   96                 dp.d_reclen = DE_SIZE;
   97                 switch (i) {
   98                     case 0:             /* `.' */
   99                     case 1:             /* `..' */
  100                         dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id;
  101                         if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO;
  102                         dp.d_namlen = i + 1;
  103                         dp.d_name[0] = '.';
  104                         dp.d_name[1] = '.';
  105                         dp.d_name[i + 1] = '\0';
  106                         dp.d_type = DT_DIR;
  107                         break;
  108                     default:
  109                         error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred);
  110                         if (error && error < 0x80) break;
  111                         dp.d_fileno = fattr.dirEntNum;
  112                         dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG;
  113                         dp.d_namlen = fattr.nameLen;
  114                         bcopy(fattr.entryName, dp.d_name, dp.d_namlen);
  115                         dp.d_name[dp.d_namlen] = '\0';
  116 #if 0
  117                         if (error && eofflag) {
  118                         /*      *eofflag = 1;*/
  119                                 break;
  120                         }
  121 #endif
  122                         break;
  123                 }
  124                 if (nwfs_fastlookup && !error && i > 1) {
  125                         fid.f_id = fattr.dirEntNum;
  126                         fid.f_parent = np->n_fid.f_id;
  127                         error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp);
  128                         if (!error) {
  129                                 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
  130                                 cn.cn_nameptr = dp.d_name;
  131                                 cn.cn_namelen = dp.d_namlen;
  132                                 cache_enter(vp, newvp, &cn);
  133                                 vput(newvp);
  134                         } else
  135                                 error = 0;
  136                 }
  137                 if (error >= 0x80) {
  138                     error = 0;
  139                     break;
  140                 }
  141                 if ((error = uiomove(&dp, DE_SIZE, uio)))
  142                         break;
  143         }
  144 
  145         uio->uio_offset = i * DE_SIZE;
  146         return (error);
  147 }
  148 
  149 int
  150 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) {
  151         struct nwmount *nmp = VFSTONWFS(vp->v_mount);
  152         struct nwnode *np = VTONW(vp);
  153         struct thread *td;
  154         struct vattr vattr;
  155         int error, biosize;
  156 
  157         if (vp->v_type != VREG && vp->v_type != VDIR) {
  158                 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__);
  159                 return EIO;
  160         }
  161         if (uiop->uio_resid == 0) return 0;
  162         if (uiop->uio_offset < 0) return EINVAL;
  163 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
  164                 return (EFBIG);*/
  165         td = uiop->uio_td;
  166         if (vp->v_type == VDIR) {
  167                 error = nwfs_readvdir(vp, uiop, cred);
  168                 return error;
  169         }
  170         biosize = NWFSTOCONN(nmp)->buffer_size;
  171         if (np->n_flag & NMODIFIED) {
  172                 nwfs_attr_cacheremove(vp);
  173                 error = VOP_GETATTR(vp, &vattr, cred);
  174                 if (error) return (error);
  175                 np->n_mtime = vattr.va_mtime.tv_sec;
  176         } else {
  177                 error = VOP_GETATTR(vp, &vattr, cred);
  178                 if (error) return (error);
  179                 if (np->n_mtime != vattr.va_mtime.tv_sec) {
  180                         error = nwfs_vinvalbuf(vp, td);
  181                         if (error) return (error);
  182                         np->n_mtime = vattr.va_mtime.tv_sec;
  183                 }
  184         }
  185         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
  186         return (error);
  187 }
  188 
  189 int
  190 nwfs_writevnode(vp, uiop, cred, ioflag)
  191         struct vnode *vp;
  192         struct uio *uiop;
  193         struct ucred *cred;
  194         int ioflag;
  195 {
  196         struct nwmount *nmp = VTONWFS(vp);
  197         struct nwnode *np = VTONW(vp);
  198         struct thread *td;
  199 /*      struct vattr vattr;*/
  200         int error = 0;
  201 
  202         if (vp->v_type != VREG) {
  203                 printf("%s: vn types other than VREG unsupported !\n",__func__);
  204                 return EIO;
  205         }
  206         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  207         if (uiop->uio_offset < 0) return EINVAL;
  208 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
  209                 return (EFBIG);*/
  210         td = uiop->uio_td;
  211         if (ioflag & (IO_APPEND | IO_SYNC)) {
  212                 if (np->n_flag & NMODIFIED) {
  213                         nwfs_attr_cacheremove(vp);
  214                         error = nwfs_vinvalbuf(vp, td);
  215                         if (error) return (error);
  216                 }
  217                 if (ioflag & IO_APPEND) {
  218                 /* We can relay only on local information about file size,
  219                  * because until file is closed NetWare will not return
  220                  * the correct size. */
  221 #ifdef notyet
  222                         nwfs_attr_cacheremove(vp);
  223                         error = VOP_GETATTR(vp, &vattr, cred);
  224                         if (error) return (error);
  225 #endif
  226                         uiop->uio_offset = np->n_size;
  227                 }
  228         }
  229         if (uiop->uio_resid == 0) return 0;
  230 
  231         if (vn_rlimit_fsize(vp, uiop, td))
  232                 return (EFBIG);
  233 
  234         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
  235         NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  236         if (!error) {
  237                 if (uiop->uio_offset > np->n_size) {
  238                         np->n_vattr.va_size = np->n_size = uiop->uio_offset;
  239                         vnode_pager_setsize(vp, np->n_size);
  240                 }
  241         }
  242         return (error);
  243 }
  244 
  245 /*
  246  * Do an I/O operation to/from a cache block.
  247  */
  248 int
  249 nwfs_doio(vp, bp, cr, td)
  250         struct vnode *vp;
  251         struct buf *bp;
  252         struct ucred *cr;
  253         struct thread *td;
  254 {
  255         struct uio *uiop;
  256         struct nwnode *np;
  257         struct nwmount *nmp;
  258         int error = 0;
  259         struct uio uio;
  260         struct iovec io;
  261 
  262         np = VTONW(vp);
  263         nmp = VFSTONWFS(vp->v_mount);
  264         uiop = &uio;
  265         uiop->uio_iov = &io;
  266         uiop->uio_iovcnt = 1;
  267         uiop->uio_segflg = UIO_SYSSPACE;
  268         uiop->uio_td = td;
  269         if (bp->b_iocmd == BIO_READ) {
  270             io.iov_len = uiop->uio_resid = bp->b_bcount;
  271             io.iov_base = bp->b_data;
  272             uiop->uio_rw = UIO_READ;
  273             switch (vp->v_type) {
  274               case VREG:
  275                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  276                 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  277                 if (error)
  278                         break;
  279                 if (uiop->uio_resid) {
  280                         int left = uiop->uio_resid;
  281                         int nread = bp->b_bcount - left;
  282                         if (left > 0)
  283                             bzero((char *)bp->b_data + nread, left);
  284                 }
  285                 break;
  286 /*          case VDIR:
  287                 nfsstats.readdir_bios++;
  288                 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
  289                 if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
  290                         error = nfs_readdirplusrpc(vp, uiop, cr);
  291                         if (error == NFSERR_NOTSUPP)
  292                                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  293                 }
  294                 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
  295                         error = nfs_readdirrpc(vp, uiop, cr);
  296                 if (error == 0 && uiop->uio_resid == bp->b_bcount)
  297                         bp->b_flags |= B_INVAL;
  298                 break;
  299 */
  300             default:
  301                 printf("nwfs_doio:  type %x unexpected\n",vp->v_type);
  302                 break;
  303             };
  304             if (error) {
  305                 bp->b_ioflags |= BIO_ERROR;
  306                 bp->b_error = error;
  307             }
  308         } else { /* write */
  309             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  310                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  311 
  312             if (bp->b_dirtyend > bp->b_dirtyoff) {
  313                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  314                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  315                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  316                 uiop->uio_rw = UIO_WRITE;
  317                 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  318 
  319                 /*
  320                  * For an interrupted write, the buffer is still valid
  321                  * and the write hasn't been pushed to the server yet,
  322                  * so we can't set BIO_ERROR and report the interruption
  323                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  324                  * is not relevant, so the rpc attempt is essentially
  325                  * a noop.  For the case of a V3 write rpc not being
  326                  * committed to stable storage, the block is still
  327                  * dirty and requires either a commit rpc or another
  328                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  329                  * the block is reused. This is indicated by setting
  330                  * the B_DELWRI and B_NEEDCOMMIT flags.
  331                  */
  332                 if (error == EINTR
  333                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  334                         int s;
  335 
  336                         s = splbio();
  337                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  338                         if ((bp->b_flags & B_ASYNC) == 0)
  339                             bp->b_flags |= B_EINTR;
  340                         if ((bp->b_flags & B_PAGING) == 0) {
  341                             bdirty(bp);
  342                             bp->b_flags &= ~B_DONE;
  343                         }
  344                         if ((bp->b_flags & B_ASYNC) == 0)
  345                             bp->b_flags |= B_EINTR;
  346                         splx(s);
  347                 } else {
  348                         if (error) {
  349                                 bp->b_ioflags |= BIO_ERROR;
  350                                 bp->b_error /*= np->n_error */= error;
  351 /*                              np->n_flag |= NWRITEERR;*/
  352                         }
  353                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  354                 }
  355             } else {
  356                 bp->b_resid = 0;
  357                 bufdone(bp);
  358                 return (0);
  359             }
  360         }
  361         bp->b_resid = uiop->uio_resid;
  362         bufdone(bp);
  363         return (error);
  364 }
  365 
  366 /*
  367  * Vnode op for VM getpages.
  368  * Wish wish .... get rid from multiple IO routines
  369  */
  370 int
  371 nwfs_getpages(ap)
  372         struct vop_getpages_args /* {
  373                 struct vnode *a_vp;
  374                 vm_page_t *a_m;
  375                 int a_count;
  376                 int a_reqpage;
  377                 vm_ooffset_t a_offset;
  378         } */ *ap;
  379 {
  380 #ifndef NWFS_RWCACHE
  381         return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count,
  382 #else
  383         int i, error, nextoff, size, toff, npages, count;
  384         struct uio uio;
  385         struct iovec iov;
  386         vm_offset_t kva;
  387         struct buf *bp;
  388         struct vnode *vp;
  389         struct thread *td;
  390         struct ucred *cred;
  391         struct nwmount *nmp;
  392         struct nwnode *np;
  393         vm_object_t object;
  394         vm_page_t *pages;
  395 
  396         vp = ap->a_vp;
  397         td = curthread;                 /* XXX */
  398         cred = td->td_ucred;            /* XXX */
  399         np = VTONW(vp);
  400         nmp = VFSTONWFS(vp->v_mount);
  401         pages = ap->a_m;
  402         count = ap->a_count;
  403 
  404         if ((object = vp->v_object) == NULL) {
  405                 printf("nwfs_getpages: called with non-merged cache vnode??\n");
  406                 return VM_PAGER_ERROR;
  407         }
  408 
  409         bp = getpbuf(&nwfs_pbuf_freecnt);
  410         npages = btoc(count);
  411         kva = (vm_offset_t) bp->b_data;
  412         pmap_qenter(kva, pages, npages);
  413 
  414         iov.iov_base = (caddr_t) kva;
  415         iov.iov_len = count;
  416         uio.uio_iov = &iov;
  417         uio.uio_iovcnt = 1;
  418         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  419         uio.uio_resid = count;
  420         uio.uio_segflg = UIO_SYSSPACE;
  421         uio.uio_rw = UIO_READ;
  422         uio.uio_td = td;
  423 
  424         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
  425         pmap_qremove(kva, npages);
  426 
  427         relpbuf(bp, &nwfs_pbuf_freecnt);
  428 
  429         VM_OBJECT_LOCK(object);
  430         if (error && (uio.uio_resid == count)) {
  431                 printf("nwfs_getpages: error %d\n",error);
  432                 for (i = 0; i < npages; i++) {
  433                         if (ap->a_reqpage != i) {
  434                                 vm_page_lock(pages[i]);
  435                                 vm_page_free(pages[i]);
  436                                 vm_page_unlock(pages[i]);
  437                         }
  438                 }
  439                 VM_OBJECT_UNLOCK(object);
  440                 return VM_PAGER_ERROR;
  441         }
  442 
  443         size = count - uio.uio_resid;
  444 
  445         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  446                 vm_page_t m;
  447                 nextoff = toff + PAGE_SIZE;
  448                 m = pages[i];
  449 
  450                 if (nextoff <= size) {
  451                         m->valid = VM_PAGE_BITS_ALL;
  452                         KASSERT(m->dirty == 0,
  453                             ("nwfs_getpages: page %p is dirty", m));
  454                 } else {
  455                         int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
  456                         vm_page_set_valid(m, 0, nvalid);
  457                         KASSERT((m->dirty & vm_page_bits(0, nvalid)) == 0,
  458                             ("nwfs_getpages: page %p is dirty", m));
  459                 }
  460 
  461                 if (i != ap->a_reqpage)
  462                         vm_page_readahead_finish(m);
  463         }
  464         VM_OBJECT_UNLOCK(object);
  465         return 0;
  466 #endif /* NWFS_RWCACHE */
  467 }
  468 
  469 /*
  470  * Vnode op for VM putpages.
  471  * possible bug: all IO done in sync mode
  472  * Note that vop_close always invalidate pages before close, so it's
  473  * not necessary to open vnode.
  474  */
  475 int
  476 nwfs_putpages(ap)
  477         struct vop_putpages_args /* {
  478                 struct vnode *a_vp;
  479                 vm_page_t *a_m;
  480                 int a_count;
  481                 int a_sync;
  482                 int *a_rtvals;
  483                 vm_ooffset_t a_offset;
  484         } */ *ap;
  485 {
  486         int error;
  487         struct vnode *vp = ap->a_vp;
  488         struct thread *td;
  489         struct ucred *cred;
  490 
  491 #ifndef NWFS_RWCACHE
  492         td = curthread;                 /* XXX */
  493         cred = td->td_ucred;            /* XXX */
  494         VOP_OPEN(vp, FWRITE, cred, td, NULL);
  495         error = vop_stdputpages(ap);
  496         VOP_CLOSE(vp, FWRITE, cred, td);
  497         return error;
  498 #else
  499         struct uio uio;
  500         struct iovec iov;
  501         vm_offset_t kva;
  502         struct buf *bp;
  503         int i, npages, count;
  504         int *rtvals;
  505         struct nwmount *nmp;
  506         struct nwnode *np;
  507         vm_page_t *pages;
  508 
  509         td = curthread;                 /* XXX */
  510         cred = td->td_ucred;            /* XXX */
  511 /*      VOP_OPEN(vp, FWRITE, cred, td, NULL);*/
  512         np = VTONW(vp);
  513         nmp = VFSTONWFS(vp->v_mount);
  514         pages = ap->a_m;
  515         count = ap->a_count;
  516         rtvals = ap->a_rtvals;
  517         npages = btoc(count);
  518 
  519         for (i = 0; i < npages; i++) {
  520                 rtvals[i] = VM_PAGER_ERROR;
  521         }
  522 
  523         bp = getpbuf(&nwfs_pbuf_freecnt);
  524         kva = (vm_offset_t) bp->b_data;
  525         pmap_qenter(kva, pages, npages);
  526 
  527         iov.iov_base = (caddr_t) kva;
  528         iov.iov_len = count;
  529         uio.uio_iov = &iov;
  530         uio.uio_iovcnt = 1;
  531         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  532         uio.uio_resid = count;
  533         uio.uio_segflg = UIO_SYSSPACE;
  534         uio.uio_rw = UIO_WRITE;
  535         uio.uio_td = td;
  536         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
  537 
  538         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
  539 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  540         NCPVNDEBUG("paged write done: %d\n", error);
  541 
  542         pmap_qremove(kva, npages);
  543         relpbuf(bp, &nwfs_pbuf_freecnt);
  544 
  545         if (!error)
  546                 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid);
  547         return rtvals[0];
  548 #endif /* NWFS_RWCACHE */
  549 }
  550 /*
  551  * Flush and invalidate all dirty buffers. If another process is already
  552  * doing the flush, just wait for completion.
  553  */
  554 int
  555 nwfs_vinvalbuf(vp, td)
  556         struct vnode *vp;
  557         struct thread *td;
  558 {
  559         struct nwnode *np = VTONW(vp);
  560 /*      struct nwmount *nmp = VTONWFS(vp);*/
  561         int error = 0;
  562 
  563         if (vp->v_iflag & VI_DOOMED)
  564                 return (0);
  565 
  566         while (np->n_flag & NFLUSHINPROG) {
  567                 np->n_flag |= NFLUSHWANT;
  568                 error = tsleep(&np->n_flag, PRIBIO + 2, "nwfsvinv", 2 * hz);
  569                 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), td);
  570                 if (error == EINTR)
  571                         return EINTR;
  572         }
  573         np->n_flag |= NFLUSHINPROG;
  574 
  575         if (vp->v_bufobj.bo_object != NULL) {
  576                 VM_OBJECT_LOCK(vp->v_bufobj.bo_object);
  577                 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
  578                 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object);
  579         }
  580 
  581         error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  582         while (error) {
  583                 if (error == ERESTART || error == EINTR) {
  584                         np->n_flag &= ~NFLUSHINPROG;
  585                         if (np->n_flag & NFLUSHWANT) {
  586                                 np->n_flag &= ~NFLUSHWANT;
  587                                 wakeup(&np->n_flag);
  588                         }
  589                         return EINTR;
  590                 }
  591                 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  592         }
  593         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  594         if (np->n_flag & NFLUSHWANT) {
  595                 np->n_flag &= ~NFLUSHWANT;
  596                 wakeup(&np->n_flag);
  597         }
  598         return (error);
  599 }

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