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  * $FreeBSD$
   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/buf.h>
   40 #include <sys/proc.h>
   41 #include <sys/mount.h>
   42 #include <sys/namei.h>
   43 #include <sys/vnode.h>
   44 #include <sys/dirent.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/sysctl.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_page.h>
   50 #include <vm/vm_extern.h>
   51 #include <vm/vm_object.h>
   52 #include <vm/vm_pager.h>
   53 #include <vm/vnode_pager.h>
   54 
   55 #include <netncp/ncp.h>
   56 #include <netncp/ncp_conn.h>
   57 #include <netncp/ncp_subr.h>
   58 
   59 #include <nwfs/nwfs.h>
   60 #include <nwfs/nwfs_node.h>
   61 #include <nwfs/nwfs_subr.h>
   62 
   63 static int nwfs_fastlookup = 1;
   64 
   65 extern struct linker_set sysctl_vfs_nwfs;
   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_procp, 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_procp, 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((caddr_t)&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 proc *p;
  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",__FUNCTION__);
  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         p = uiop->uio_procp;
  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, p);
  182                 if (error) return (error);
  183                 np->n_mtime = vattr.va_mtime.tv_sec;
  184         } else {
  185                 error = VOP_GETATTR(vp, &vattr, cred, p);
  186                 if (error) return (error);
  187                 if (np->n_mtime != vattr.va_mtime.tv_sec) {
  188                         error = nwfs_vinvalbuf(vp, V_SAVE, cred, p, 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 proc *p;
  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",__FUNCTION__);
  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         p = uiop->uio_procp;
  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, p, 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, p);
  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 (p && uiop->uio_offset + uiop->uio_resid > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
  239                 psignal(p, SIGXFSZ);
  240                 return (EFBIG);
  241         }
  242         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
  243         NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  244         if (!error) {
  245                 if (uiop->uio_offset > np->n_size) {
  246                         np->n_vattr.va_size = np->n_size = uiop->uio_offset;
  247                         vnode_pager_setsize(vp, np->n_size);
  248                 }
  249         }
  250         return (error);
  251 }
  252 
  253 /*
  254  * Do an I/O operation to/from a cache block.
  255  */
  256 int
  257 nwfs_doio(bp, cr, p)
  258         struct buf *bp;
  259         struct ucred *cr;
  260         struct proc *p;
  261 {
  262         struct uio *uiop;
  263         struct vnode *vp;
  264         struct nwnode *np;
  265         struct nwmount *nmp;
  266         int error = 0;
  267         struct uio uio;
  268         struct iovec io;
  269 
  270         vp = bp->b_vp;
  271         np = VTONW(vp);
  272         nmp = VFSTONWFS(vp->v_mount);
  273         uiop = &uio;
  274         uiop->uio_iov = &io;
  275         uiop->uio_iovcnt = 1;
  276         uiop->uio_segflg = UIO_SYSSPACE;
  277         uiop->uio_procp = p;
  278         if (bp->b_flags & B_READ) {
  279             io.iov_len = uiop->uio_resid = bp->b_bcount;
  280             io.iov_base = bp->b_data;
  281             uiop->uio_rw = UIO_READ;
  282             switch (vp->v_type) {
  283               case VREG:
  284                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  285                 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  286                 if (error)
  287                         break;
  288                 if (uiop->uio_resid) {
  289                         int left = uiop->uio_resid;
  290                         int nread = bp->b_bcount - left;
  291                         if (left > 0)
  292                             bzero((char *)bp->b_data + nread, left);
  293                 }
  294                 break;
  295 /*          case VDIR:
  296                 nfsstats.readdir_bios++;
  297                 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
  298                 if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
  299                         error = nfs_readdirplusrpc(vp, uiop, cr);
  300                         if (error == NFSERR_NOTSUPP)
  301                                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  302                 }
  303                 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
  304                         error = nfs_readdirrpc(vp, uiop, cr);
  305                 if (error == 0 && uiop->uio_resid == bp->b_bcount)
  306                         bp->b_flags |= B_INVAL;
  307                 break;
  308 */
  309             default:
  310                 printf("nwfs_doio:  type %x unexpected\n",vp->v_type);
  311                 break;
  312             };
  313             if (error) {
  314                 bp->b_flags |= B_ERROR;
  315                 bp->b_error = error;
  316             }
  317         } else { /* write */
  318             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  319                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  320 
  321             if (bp->b_dirtyend > bp->b_dirtyoff) {
  322                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  323                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  324                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  325                 uiop->uio_rw = UIO_WRITE;
  326                 bp->b_flags |= B_WRITEINPROG;
  327                 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
  328                 bp->b_flags &= ~B_WRITEINPROG;
  329 
  330                 /*
  331                  * For an interrupted write, the buffer is still valid
  332                  * and the write hasn't been pushed to the server yet,
  333                  * so we can't set B_ERROR and report the interruption
  334                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  335                  * is not relevant, so the rpc attempt is essentially
  336                  * a noop.  For the case of a V3 write rpc not being
  337                  * committed to stable storage, the block is still
  338                  * dirty and requires either a commit rpc or another
  339                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  340                  * the block is reused. This is indicated by setting
  341                  * the B_DELWRI and B_NEEDCOMMIT flags.
  342                  */
  343                 if (error == EINTR
  344                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  345                         int s;
  346 
  347                         s = splbio();
  348                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  349                         if ((bp->b_flags & B_ASYNC) == 0)
  350                             bp->b_flags |= B_EINTR;
  351                         if ((bp->b_flags & B_PAGING) == 0) {
  352                             bdirty(bp);
  353                             bp->b_flags &= ~B_DONE;
  354                         }
  355                         if ((bp->b_flags & B_ASYNC) == 0)
  356                             bp->b_flags |= B_EINTR;
  357                         splx(s);
  358                 } else {
  359                         if (error) {
  360                                 bp->b_flags |= B_ERROR;
  361                                 bp->b_error /*= np->n_error */= error;
  362 /*                              np->n_flag |= NWRITEERR;*/
  363                         }
  364                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  365                 }
  366             } else {
  367                 bp->b_resid = 0;
  368                 biodone(bp);
  369                 return (0);
  370             }
  371         }
  372         bp->b_resid = uiop->uio_resid;
  373         biodone(bp);
  374         return (error);
  375 }
  376 
  377 /*
  378  * Vnode op for VM getpages.
  379  * Wish wish .... get rid from multiple IO routines
  380  */
  381 int
  382 nwfs_getpages(ap)
  383         struct vop_getpages_args /* {
  384                 struct vnode *a_vp;
  385                 vm_page_t *a_m;
  386                 int a_count;
  387                 int a_reqpage;
  388                 vm_ooffset_t a_offset;
  389         } */ *ap;
  390 {
  391 #ifndef NWFS_RWCACHE
  392         return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
  393                 ap->a_reqpage);
  394 #else
  395         int i, error, nextoff, size, toff, npages, count;
  396         struct uio uio;
  397         struct iovec iov;
  398         vm_offset_t kva;
  399         struct buf *bp;
  400         struct vnode *vp;
  401         struct proc *p;
  402         struct ucred *cred;
  403         struct nwmount *nmp;
  404         struct nwnode *np;
  405         vm_page_t *pages;
  406 
  407         vp = ap->a_vp;
  408         p = curproc;                            /* XXX */
  409         cred = curproc->p_ucred;                /* XXX */
  410         np = VTONW(vp);
  411         nmp = VFSTONWFS(vp->v_mount);
  412         pages = ap->a_m;
  413         count = ap->a_count;
  414 
  415         if (vp->v_object == NULL) {
  416                 printf("nwfs_getpages: called with non-merged cache vnode??\n");
  417                 return VM_PAGER_ERROR;
  418         }
  419 
  420         bp = getpbuf(&nwfs_pbuf_freecnt);
  421         npages = btoc(count);
  422         kva = (vm_offset_t) bp->b_data;
  423         pmap_qenter(kva, pages, npages);
  424 
  425         iov.iov_base = (caddr_t) kva;
  426         iov.iov_len = count;
  427         uio.uio_iov = &iov;
  428         uio.uio_iovcnt = 1;
  429         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  430         uio.uio_resid = count;
  431         uio.uio_segflg = UIO_SYSSPACE;
  432         uio.uio_rw = UIO_READ;
  433         uio.uio_procp = p;
  434 
  435         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
  436         pmap_qremove(kva, npages);
  437 
  438         relpbuf(bp, &nwfs_pbuf_freecnt);
  439 
  440         if (error && (uio.uio_resid == count)) {
  441                 printf("nwfs_getpages: error %d\n",error);
  442                 for (i = 0; i < npages; i++) {
  443                         if (ap->a_reqpage != i)
  444                                 vnode_pager_freepage(pages[i]);
  445                 }
  446                 return VM_PAGER_ERROR;
  447         }
  448 
  449         size = count - uio.uio_resid;
  450 
  451         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  452                 vm_page_t m;
  453                 nextoff = toff + PAGE_SIZE;
  454                 m = pages[i];
  455 
  456                 m->flags &= ~PG_ZERO;
  457 
  458                 if (nextoff <= size) {
  459                         m->valid = VM_PAGE_BITS_ALL;
  460                         m->dirty = 0;
  461                 } else {
  462                         int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
  463                         vm_page_set_validclean(m, 0, nvalid);
  464                 }
  465                 
  466                 if (i != ap->a_reqpage) {
  467                         /*
  468                          * Whether or not to leave the page activated is up in
  469                          * the air, but we should put the page on a page queue
  470                          * somewhere (it already is in the object).  Result:
  471                          * It appears that emperical results show that
  472                          * deactivating pages is best.
  473                          */
  474 
  475                         /*
  476                          * Just in case someone was asking for this page we
  477                          * now tell them that it is ok to use.
  478                          */
  479                         if (!error) {
  480                                 if (m->flags & PG_WANTED)
  481                                         vm_page_activate(m);
  482                                 else
  483                                         vm_page_deactivate(m);
  484                                 vm_page_wakeup(m);
  485                         } else {
  486                                 vnode_pager_freepage(m);
  487                         }
  488                 }
  489         }
  490         return 0;
  491 #endif /* NWFS_RWCACHE */
  492 }
  493 
  494 /*
  495  * Vnode op for VM putpages.
  496  * possible bug: all IO done in sync mode
  497  * Note that vop_close always invalidate pages before close, so it's
  498  * not necessary to open vnode.
  499  */
  500 int
  501 nwfs_putpages(ap)
  502         struct vop_putpages_args /* {
  503                 struct vnode *a_vp;
  504                 vm_page_t *a_m;
  505                 int a_count;
  506                 int a_sync;
  507                 int *a_rtvals;
  508                 vm_ooffset_t a_offset;
  509         } */ *ap;
  510 {
  511         int error;
  512         struct vnode *vp = ap->a_vp;
  513         struct proc *p;
  514         struct ucred *cred;
  515 
  516 #ifndef NWFS_RWCACHE
  517         p = curproc;                    /* XXX */
  518         cred = p->p_ucred;              /* XXX */
  519         VOP_OPEN(vp, FWRITE, cred, p);
  520         error = vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
  521                 ap->a_sync, ap->a_rtvals);
  522         VOP_CLOSE(vp, FWRITE, cred, p);
  523         return error;
  524 #else
  525         struct uio uio;
  526         struct iovec iov;
  527         vm_offset_t kva;
  528         struct buf *bp;
  529         int i, npages, count;
  530         int *rtvals;
  531         struct nwmount *nmp;
  532         struct nwnode *np;
  533         vm_page_t *pages;
  534 
  535         p = curproc;                    /* XXX */
  536         cred = p->p_ucred;              /* XXX */
  537 /*      VOP_OPEN(vp, FWRITE, cred, p);*/
  538         np = VTONW(vp);
  539         nmp = VFSTONWFS(vp->v_mount);
  540         pages = ap->a_m;
  541         count = ap->a_count;
  542         rtvals = ap->a_rtvals;
  543         npages = btoc(count);
  544 
  545         for (i = 0; i < npages; i++) {
  546                 rtvals[i] = VM_PAGER_AGAIN;
  547         }
  548 
  549         bp = getpbuf(&nwfs_pbuf_freecnt);
  550         kva = (vm_offset_t) bp->b_data;
  551         pmap_qenter(kva, pages, npages);
  552 
  553         iov.iov_base = (caddr_t) kva;
  554         iov.iov_len = count;
  555         uio.uio_iov = &iov;
  556         uio.uio_iovcnt = 1;
  557         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  558         uio.uio_resid = count;
  559         uio.uio_segflg = UIO_SYSSPACE;
  560         uio.uio_rw = UIO_WRITE;
  561         uio.uio_procp = p;
  562         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
  563 
  564         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
  565 /*      VOP_CLOSE(vp, FWRITE, cred, p);*/
  566         NCPVNDEBUG("paged write done: %d\n", error);
  567 
  568         pmap_qremove(kva, npages);
  569         relpbuf(bp, &nwfs_pbuf_freecnt);
  570 
  571         if (!error) {
  572                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
  573                 for (i = 0; i < nwritten; i++) {
  574                         rtvals[i] = VM_PAGER_OK;
  575                         pages[i]->dirty = 0;
  576                 }
  577         }
  578         return rtvals[0];
  579 #endif /* NWFS_RWCACHE */
  580 }
  581 /*
  582  * Flush and invalidate all dirty buffers. If another process is already
  583  * doing the flush, just wait for completion.
  584  */
  585 int
  586 nwfs_vinvalbuf(vp, flags, cred, p, intrflg)
  587         struct vnode *vp;
  588         int flags;
  589         struct ucred *cred;
  590         struct proc *p;
  591         int intrflg;
  592 {
  593         struct nwnode *np = VTONW(vp);
  594 /*      struct nwmount *nmp = VTONWFS(vp);*/
  595         int error = 0, slpflag, slptimeo;
  596 
  597         if (vp->v_flag & VXLOCK) {
  598                 return (0);
  599         }
  600         if (intrflg) {
  601                 slpflag = PCATCH;
  602                 slptimeo = 2 * hz;
  603         } else {
  604                 slpflag = 0;
  605                 slptimeo = 0;
  606         }
  607         while (np->n_flag & NFLUSHINPROG) {
  608                 np->n_flag |= NFLUSHWANT;
  609                 error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "nwfsvinv", slptimeo);
  610                 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), p);
  611                 if (error == EINTR && intrflg)
  612                         return EINTR;
  613         }
  614         np->n_flag |= NFLUSHINPROG;
  615         error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
  616         while (error) {
  617                 if (intrflg && (error == ERESTART || error == EINTR)) {
  618                         np->n_flag &= ~NFLUSHINPROG;
  619                         if (np->n_flag & NFLUSHWANT) {
  620                                 np->n_flag &= ~NFLUSHWANT;
  621                                 wakeup((caddr_t)&np->n_flag);
  622                         }
  623                         return EINTR;
  624                 }
  625                 error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
  626         }
  627         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  628         if (np->n_flag & NFLUSHWANT) {
  629                 np->n_flag &= ~NFLUSHWANT;
  630                 wakeup((caddr_t)&np->n_flag);
  631         }
  632         return (error);
  633 }
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FreeBSD/Linux Kernel Cross Reference sys/nwfs/nwfs_io.c

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