sys/vfs/nwfs/nwfs_io.c

   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: src/sys/nwfs/nwfs_io.c,v 1.6.2.1 2000/10/25 02:11:10 bp Exp $
  33  * $DragonFly: src/sys/vfs/nwfs/nwfs_io.c,v 1.24 2007/02/22 15:50:50 corecode Exp $
  34  *
  35  */
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/resourcevar.h>    /* defines plimit structure in proc struct */
  39 #include <sys/kernel.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 <netproto/ncp/ncp.h>
  57 #include <netproto/ncp/ncp_conn.h>
  58 #include <netproto/ncp/ncp_subr.h>
  59
  60 #include <sys/thread2.h>
  61
  62 #include <machine/limits.h>
  63
  64 #include "nwfs.h"
  65 #include "nwfs_node.h"
  66 #include "nwfs_subr.h"
  67
  68 static int nwfs_fastlookup = 1;
  69
  70 SYSCTL_DECL(_vfs_nwfs);
  71 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, "");
  72
  73
  74 extern int nwfs_pbuf_freecnt;
  75
  76 #define NWFS_RWCACHE
  77
  78 static int
  79 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
  80 {
  81         struct nwmount *nmp = VTONWFS(vp);
  82         int error, count, i;
  83         struct nwnode *np = VTONW(vp);
  84         struct nw_entry_info fattr;
  85         struct vnode *newvp;
  86         ncpfid fid;
  87         ino_t d_ino;
  88         size_t d_namlen;
  89         const char *d_name;
  90         uint8_t d_type;
  91
  92         np = VTONW(vp);
  93         NCPVNDEBUG("dirname='%s'\n",np->n_name);
  94         if (uio->uio_resid < 0 || uio->uio_offset < 0 || uio->uio_offset > INT_MAX)
  95                 return (EINVAL);
  96         error = 0;
  97         count = 0;
  98         i = uio->uio_offset; /* offset in directory */
  99         if (i == 0) {
 100                 error = ncp_initsearch(vp, uio->uio_td, cred);
 101                 if (error) {
 102                         NCPVNDEBUG("cannot initialize search, error=%d",error);
 103                         return( error );
 104                 }
 105         }
 106
 107         for (; !error && uio->uio_resid > 0; i++) {
 108                 switch (i) {
 109                     case 0:             /* `.' */
 110                         d_ino = np->n_fid.f_id;
 111                         if (d_ino == 0)
 112                                 d_ino = NWFS_ROOT_INO;
 113                         d_namlen = 1;
 114                         d_name = ".";
 115                         d_type = DT_DIR;
 116                         break;
 117                     case 1:             /* `..' */
 118                         d_ino = np->n_parent.f_id;
 119                         if (d_ino == 0)
 120                                 d_ino = NWFS_ROOT_INO;
 121                         d_namlen = 2;
 122                         d_name = "..";
 123                         d_type = DT_DIR;
 124                         break;
 125                     default:
 126                         error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred);
 127                         if (error && error < 0x80)
 128                                 goto done;
 129                         d_ino = fattr.dirEntNum;
 130                         d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG;
 131                         d_namlen = fattr.nameLen;
 132                         d_name = fattr.entryName;
 133 #if 0
 134                         if (error && eofflag) {
 135                         /*      *eofflag = 1;*/
 136                                 break;
 137                         }
 138 #endif
 139                         break;
 140                 }
 141                 if (nwfs_fastlookup && !error && i > 1) {
 142                         fid.f_id = fattr.dirEntNum;
 143                         fid.f_parent = np->n_fid.f_id;
 144                         error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp);
 145                         if (!error) {
 146                                 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
 147                                 vput(newvp);
 148                         } else
 149                                 error = 0;
 150                 }
 151                 if (error >= 0x80) {
 152                     error = 0;
 153                     break;
 154                 }
 155                 if (vop_write_dirent(&error, uio, d_ino, d_type, d_namlen, d_name))
 156                         break;
 157         }
 158 done:
 159         uio->uio_offset = i;
 160         return (error);
 161 }
 162
 163 int
 164 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 165 {
 166         struct nwmount *nmp = VFSTONWFS(vp->v_mount);
 167         struct nwnode *np = VTONW(vp);
 168         struct thread *td;
 169         struct vattr vattr;
 170         int error, biosize;
 171
 172         if (vp->v_type != VREG && vp->v_type != VDIR) {
 173                 kprintf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__);
 174                 return EIO;
 175         }
 176         if (uiop->uio_resid == 0) return 0;
 177         if (uiop->uio_offset < 0) return EINVAL;
 178 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
 179                 return (EFBIG);*/
 180         td = uiop->uio_td;
 181         if (vp->v_type == VDIR) {
 182                 error = nwfs_readvdir(vp, uiop, cred);
 183                 return error;
 184         }
 185         biosize = NWFSTOCONN(nmp)->buffer_size;
 186         if (np->n_flag & NMODIFIED) {
 187                 nwfs_attr_cacheremove(vp);
 188                 error = VOP_GETATTR(vp, &vattr);
 189                 if (error) return (error);
 190                 np->n_mtime = vattr.va_mtime.tv_sec;
 191         } else {
 192                 error = VOP_GETATTR(vp, &vattr);
 193                 if (error) return (error);
 194                 if (np->n_mtime != vattr.va_mtime.tv_sec) {
 195                         error = nwfs_vinvalbuf(vp, V_SAVE, 1);
 196                         if (error) return (error);
 197                         np->n_mtime = vattr.va_mtime.tv_sec;
 198                 }
 199         }
 200         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop,cred);
 201         return (error);
 202 }
 203
 204 int
 205 nwfs_writevnode(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 206                 int ioflag)
 207 {
 208         struct nwmount *nmp = VTONWFS(vp);
 209         struct nwnode *np = VTONW(vp);
 210         struct thread *td;
 211 /*      struct vattr vattr;*/
 212         int error = 0;
 213
 214         if (vp->v_type != VREG) {
 215                 kprintf("%s: vn types other than VREG unsupported !\n",__func__);
 216                 return EIO;
 217         }
 218         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 219         if (uiop->uio_offset < 0) return EINVAL;
 220 /*      if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
 221                 return (EFBIG);*/
 222         td = uiop->uio_td;
 223         if (ioflag & (IO_APPEND | IO_SYNC)) {
 224                 if (np->n_flag & NMODIFIED) {
 225                         nwfs_attr_cacheremove(vp);
 226                         error = nwfs_vinvalbuf(vp, V_SAVE, 1);
 227                         if (error) return (error);
 228                 }
 229                 if (ioflag & IO_APPEND) {
 230                 /* We can relay only on local information about file size,
 231                  * because until file is closed NetWare will not return
 232                  * the correct size. */
 233 #if notyet
 234                         nwfs_attr_cacheremove(vp);
 235                         error = VOP_GETATTR(vp, &vattr);
 236                         if (error) return (error);
 237 #endif
 238                         uiop->uio_offset = np->n_size;
 239                 }
 240         }
 241         if (uiop->uio_resid == 0) return 0;
 242         if (td->td_proc && uiop->uio_offset + uiop->uio_resid >
 243             td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 244                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 245                 return (EFBIG);
 246         }
 247         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
 248         NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 249         if (!error) {
 250                 if (uiop->uio_offset > np->n_size) {
 251                         np->n_vattr.va_size = np->n_size = uiop->uio_offset;
 252                         vnode_pager_setsize(vp, np->n_size);
 253                 }
 254         }
 255         return (error);
 256 }
 257
 258 /*
 259  * Do an I/O operation to/from a cache block.
 260  */
 261 int
 262 nwfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td)
 263 {
 264         struct buf *bp = bio->bio_buf;
 265         struct uio *uiop;
 266         struct nwnode *np;
 267         struct nwmount *nmp;
 268         int error = 0;
 269         struct uio uio;
 270         struct iovec io;
 271
 272         np = VTONW(vp);
 273         nmp = VFSTONWFS(vp->v_mount);
 274         uiop = &uio;
 275         uiop->uio_iov = &io;
 276         uiop->uio_iovcnt = 1;
 277         uiop->uio_segflg = UIO_SYSSPACE;
 278         uiop->uio_td = td;
 279
 280         if (bp->b_cmd == BUF_CMD_READ) {
 281             io.iov_len = uiop->uio_resid = bp->b_bcount;
 282             io.iov_base = bp->b_data;
 283             uiop->uio_rw = UIO_READ;
 284             switch (vp->v_type) {
 285               case VREG:
 286                 uiop->uio_offset = bio->bio_offset;
 287                 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
 288                 if (error)
 289                         break;
 290                 if (uiop->uio_resid) {
 291                         int left = uiop->uio_resid;
 292                         int nread = bp->b_bcount - left;
 293                         if (left > 0)
 294                             bzero((char *)bp->b_data + nread, left);
 295                 }
 296                 break;
 297 /*          case VDIR:
 298                 nfsstats.readdir_bios++;
 299                 uiop->uio_offset = bio->bio_offset;
 300                 if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
 301                         error = nfs_readdirplusrpc(vp, uiop, cr);
 302                         if (error == NFSERR_NOTSUPP)
 303                                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
 304                 }
 305                 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
 306                         error = nfs_readdirrpc(vp, uiop, cr);
 307                 if (error == 0 && uiop->uio_resid == bp->b_bcount)
 308                         bp->b_flags |= B_INVAL;
 309                 break;
 310 */
 311             default:
 312                 kprintf("nwfs_doio:  type %x unexpected\n",vp->v_type);
 313                 break;
 314             };
 315             if (error) {
 316                 bp->b_flags |= B_ERROR;
 317                 bp->b_error = error;
 318             }
 319         } else { /* write */
 320             KKASSERT(bp->b_cmd == BUF_CMD_WRITE);
 321             if (bio->bio_offset + bp->b_dirtyend > np->n_size)
 322                 bp->b_dirtyend = np->n_size - bio->bio_offset;
 323
 324             if (bp->b_dirtyend > bp->b_dirtyoff) {
 325                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
 326                 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff;
 327                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
 328                 uiop->uio_rw = UIO_WRITE;
 329                 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
 330
 331                 /*
 332                  * For an interrupted write, the buffer is still valid
 333                  * and the write hasn't been pushed to the server yet,
 334                  * so we can't set B_ERROR and report the interruption
 335                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
 336                  * is not relevant, so the rpc attempt is essentially
 337                  * a noop.  For the case of a V3 write rpc not being
 338                  * committed to stable storage, the block is still
 339                  * dirty and requires either a commit rpc or another
 340                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
 341                  * the block is reused. This is indicated by setting
 342                  * the B_DELWRI and B_NEEDCOMMIT flags.
 343                  */
 344                 if (error == EINTR
 345                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
 346
 347                         crit_enter();
 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                         if ((bp->b_flags & B_ASYNC) == 0)
 354                             bp->b_flags |= B_EINTR;
 355                         crit_exit();
 356                 } else {
 357                         if (error) {
 358                                 bp->b_flags |= B_ERROR;
 359                                 bp->b_error /*= np->n_error */= error;
 360 /*                              np->n_flag |= NWRITEERR;*/
 361                         }
 362                         bp->b_dirtyoff = bp->b_dirtyend = 0;
 363                 }
 364             } else {
 365                 bp->b_resid = 0;
 366                 biodone(bio);
 367                 return (0);
 368             }
 369         }
 370         bp->b_resid = uiop->uio_resid;
 371         biodone(bio);
 372         return (error);
 373 }
 374
 375 /*
 376  * Vnode op for VM getpages.
 377  * Wish wish .... get rid from multiple IO routines
 378  *
 379  * nwfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
 380  *               int a_reqpage, vm_ooffset_t a_offset)
 381  */
 382 int
 383 nwfs_getpages(struct vop_getpages_args *ap)
 384 {
 385 #ifndef NWFS_RWCACHE
 386         return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
 387                 ap->a_reqpage);
 388 #else
 389         int i, error, nextoff, size, toff, npages, count;
 390         struct uio uio;
 391         struct iovec iov;
 392         vm_offset_t kva;
 393         struct buf *bp;
 394         struct vnode *vp;
 395         struct thread *td = curthread;  /* XXX */
 396         struct ucred *cred;
 397         struct nwmount *nmp;
 398         struct nwnode *np;
 399         vm_page_t *pages;
 400
 401         KKASSERT(td->td_proc);
 402         cred = td->td_proc->p_ucred;
 403
 404         vp = ap->a_vp;
 405         np = VTONW(vp);
 406         nmp = VFSTONWFS(vp->v_mount);
 407         pages = ap->a_m;
 408         count = ap->a_count;
 409
 410         if (vp->v_object == NULL) {
 411                 kprintf("nwfs_getpages: called with non-merged cache vnode??\n");
 412                 return VM_PAGER_ERROR;
 413         }
 414
 415         bp = getpbuf(&nwfs_pbuf_freecnt);
 416         npages = btoc(count);
 417         kva = (vm_offset_t) bp->b_data;
 418         pmap_qenter(kva, pages, npages);
 419
 420         iov.iov_base = (caddr_t) kva;
 421         iov.iov_len = count;
 422         uio.uio_iov = &iov;
 423         uio.uio_iovcnt = 1;
 424         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 425         uio.uio_resid = count;
 426         uio.uio_segflg = UIO_SYSSPACE;
 427         uio.uio_rw = UIO_READ;
 428         uio.uio_td = td;
 429
 430         error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
 431         pmap_qremove(kva, npages);
 432
 433         relpbuf(bp, &nwfs_pbuf_freecnt);
 434
 435         if (error && (uio.uio_resid == count)) {
 436                 kprintf("nwfs_getpages: error %d\n",error);
 437                 for (i = 0; i < npages; i++) {
 438                         if (ap->a_reqpage != i)
 439                                 vnode_pager_freepage(pages[i]);
 440                 }
 441                 return VM_PAGER_ERROR;
 442         }
 443
 444         size = count - uio.uio_resid;
 445
 446         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
 447                 vm_page_t m;
 448                 nextoff = toff + PAGE_SIZE;
 449                 m = pages[i];
 450
 451                 m->flags &= ~PG_ZERO;
 452
 453                 if (nextoff <= size) {
 454                         m->valid = VM_PAGE_BITS_ALL;
 455                         m->dirty = 0;
 456                 } else {
 457                         int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
 458                         vm_page_set_validclean(m, 0, nvalid);
 459                 }
 460
 461                 if (i != ap->a_reqpage) {
 462                         /*
 463                          * Whether or not to leave the page activated is up in
 464                          * the air, but we should put the page on a page queue
 465                          * somewhere (it already is in the object).  Result:
 466                          * It appears that emperical results show that
 467                          * deactivating pages is best.
 468                          */
 469
 470                         /*
 471                          * Just in case someone was asking for this page we
 472                          * now tell them that it is ok to use.
 473                          */
 474                         if (!error) {
 475                                 if (m->flags & PG_WANTED)
 476                                         vm_page_activate(m);
 477                                 else
 478                                         vm_page_deactivate(m);
 479                                 vm_page_wakeup(m);
 480                         } else {
 481                                 vnode_pager_freepage(m);
 482                         }
 483                 }
 484         }
 485         return 0;
 486 #endif /* NWFS_RWCACHE */
 487 }
 488
 489 /*
 490  * Vnode op for VM putpages.
 491  * possible bug: all IO done in sync mode
 492  * Note that vop_close always invalidate pages before close, so it's
 493  * not necessary to open vnode.
 494  *
 495  * nwfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
 496  *               int a_sync, int *a_rtvals, vm_ooffset_t a_offset)
 497  */
 498 int
 499 nwfs_putpages(struct vop_putpages_args *ap)
 500 {
 501         int error;
 502         struct thread *td = curthread;  /* XXX */
 503         struct vnode *vp = ap->a_vp;
 504         struct ucred *cred;
 505
 506 #ifndef NWFS_RWCACHE
 507         KKASSERT(td->td_proc);
 508         cred = td->td_proc->p_ucred;            /* XXX */
 509         VOP_OPEN(vp, FWRITE, cred, NULL);
 510         error = vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
 511                 ap->a_sync, ap->a_rtvals);
 512         VOP_CLOSE(vp, FWRITE, cred);
 513         return error;
 514 #else
 515         struct uio uio;
 516         struct iovec iov;
 517         vm_offset_t kva;
 518         struct buf *bp;
 519         int i, npages, count;
 520         int *rtvals;
 521         struct nwmount *nmp;
 522         struct nwnode *np;
 523         vm_page_t *pages;
 524
 525         KKASSERT(td->td_proc);
 526         cred = td->td_proc->p_ucred;            /* XXX */
 527
 528 /*      VOP_OPEN(vp, FWRITE, cred, NULL);*/
 529         np = VTONW(vp);
 530         nmp = VFSTONWFS(vp->v_mount);
 531         pages = ap->a_m;
 532         count = ap->a_count;
 533         rtvals = ap->a_rtvals;
 534         npages = btoc(count);
 535
 536         for (i = 0; i < npages; i++) {
 537                 rtvals[i] = VM_PAGER_AGAIN;
 538         }
 539
 540         bp = getpbuf(&nwfs_pbuf_freecnt);
 541         kva = (vm_offset_t) bp->b_data;
 542         pmap_qenter(kva, pages, npages);
 543
 544         iov.iov_base = (caddr_t) kva;
 545         iov.iov_len = count;
 546         uio.uio_iov = &iov;
 547         uio.uio_iovcnt = 1;
 548         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 549         uio.uio_resid = count;
 550         uio.uio_segflg = UIO_SYSSPACE;
 551         uio.uio_rw = UIO_WRITE;
 552         uio.uio_td = td;
 553         NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
 554
 555         error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
 556 /*      VOP_CLOSE(vp, FWRITE, cred);*/
 557         NCPVNDEBUG("paged write done: %d\n", error);
 558
 559         pmap_qremove(kva, npages);
 560         relpbuf(bp, &nwfs_pbuf_freecnt);
 561
 562         if (!error) {
 563                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
 564                 for (i = 0; i < nwritten; i++) {
 565                         rtvals[i] = VM_PAGER_OK;
 566                         pages[i]->dirty = 0;
 567                 }
 568         }
 569         return rtvals[0];
 570 #endif /* NWFS_RWCACHE */
 571 }
 572 /*
 573  * Flush and invalidate all dirty buffers. If another process is already
 574  * doing the flush, just wait for completion.
 575  */
 576 int
 577 nwfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
 578 {
 579         struct nwnode *np = VTONW(vp);
 580 /*      struct nwmount *nmp = VTONWFS(vp);*/
 581         int error = 0, slpflag, slptimeo;
 582
 583         if (vp->v_flag & VRECLAIMED) {
 584                 return (0);
 585         }
 586         if (intrflg) {
 587                 slpflag = PCATCH;
 588                 slptimeo = 2 * hz;
 589         } else {
 590                 slpflag = 0;
 591                 slptimeo = 0;
 592         }
 593         while (np->n_flag & NFLUSHINPROG) {
 594                 np->n_flag |= NFLUSHWANT;
 595                 error = tsleep((caddr_t)&np->n_flag, 0, "nwfsvinv", slptimeo);
 596                 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), curthread);
 597                 if (error == EINTR && intrflg)
 598                         return EINTR;
 599         }
 600         np->n_flag |= NFLUSHINPROG;
 601         error = vinvalbuf(vp, flags, slpflag, 0);
 602         while (error) {
 603                 if (intrflg && (error == ERESTART || error == EINTR)) {
 604                         np->n_flag &= ~NFLUSHINPROG;
 605                         if (np->n_flag & NFLUSHWANT) {
 606                                 np->n_flag &= ~NFLUSHWANT;
 607                                 wakeup((caddr_t)&np->n_flag);
 608                         }
 609                         return EINTR;
 610                 }
 611                 error = vinvalbuf(vp, flags, slpflag, 0);
 612         }
 613         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
 614         if (np->n_flag & NFLUSHWANT) {
 615                 np->n_flag &= ~NFLUSHWANT;
 616                 wakeup((caddr_t)&np->n_flag);
 617         }
 618         return (error);
 619 }