sys/vfs/smbfs/smbfs_io.c

   1 /*
   2  * Copyright (c) 2000-2001, 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/fs/smbfs/smbfs_io.c,v 1.3.2.3 2003/01/17 08:20:26 tjr Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/uio.h>
  38 #include <sys/resourcevar.h>    /* defines plimit structure in proc struct */
  39 #include <sys/kernel.h>
  40 #include <sys/proc.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/mount.h>
  43 #include <sys/vnode.h>
  44 #include <sys/dirent.h>
  45 #include <sys/signalvar.h>
  46 #include <sys/sysctl.h>
  47
  48 #include  <machine/limits.h>
  49
  50 #include <vm/vm.h>
  51 #include <vm/vm_page2.h>
  52 #include <vm/vm_extern.h>
  53 #include <vm/vm_object.h>
  54 #include <vm/vm_pager.h>
  55 #include <vm/vnode_pager.h>
  56
  57 #include <netproto/smb/smb.h>
  58 #include <netproto/smb/smb_conn.h>
  59 #include <netproto/smb/smb_subr.h>
  60
  61 #include "smbfs.h"
  62 #include "smbfs_node.h"
  63 #include "smbfs_subr.h"
  64
  65 #include <sys/buf.h>
  66
  67 #include <sys/thread2.h>
  68
  69 /*#define SMBFS_RWGENERIC*/
  70
  71 extern int smbfs_pbuf_freecnt;
  72
  73 static int smbfs_fastlookup = 1;
  74
  75 SYSCTL_DECL(_vfs_smbfs);
  76 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
  77
  78 static int
  79 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
  80 {
  81         struct smb_cred scred;
  82         struct smbfs_fctx *ctx;
  83         struct vnode *newvp;
  84         struct smbnode *np;
  85         int error, offset, retval;
  86
  87         np = VTOSMB(vp);
  88         SMBVDEBUG("dirname='%s'\n", np->n_name);
  89         smb_makescred(&scred, uio->uio_td, cred);
  90
  91         if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX)
  92                 return(EINVAL);
  93
  94         error = 0;
  95         offset = uio->uio_offset;
  96
  97         if (uio->uio_resid > 0 && offset < 1) {
  98                 if (vop_write_dirent(&error, uio, np->n_ino, DT_DIR, 1, "."))
  99                         goto done;
 100                 if (error)
 101                         goto done;
 102                 ++offset;
 103         }
 104
 105         if (uio->uio_resid > 0 && offset < 2) {
 106                 if (vop_write_dirent(&error, uio,
 107                     np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2,
 108                     DT_DIR, 2, ".."))
 109                         goto done;
 110                 if (error)
 111                         goto done;
 112                 ++offset;
 113         }
 114
 115         if (uio->uio_resid == 0)
 116                 goto done;
 117
 118         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
 119                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
 120                 if (np->n_dirseq) {
 121                         smbfs_findclose(np->n_dirseq, &scred);
 122                         np->n_dirseq = NULL;
 123                 }
 124                 np->n_dirofs = 2;
 125                 error = smbfs_findopen(np, "*", 1,
 126                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
 127                     &scred, &ctx);
 128                 if (error) {
 129                         SMBVDEBUG("can not open search, error = %d", error);
 130                         return error;
 131                 }
 132                 np->n_dirseq = ctx;
 133         } else {
 134                 ctx = np->n_dirseq;
 135         }
 136         while (np->n_dirofs < offset) {
 137                 error = smbfs_findnext(ctx, offset - np->n_dirofs, &scred);
 138                 ++np->n_dirofs;
 139                 if (error) {
 140                         smbfs_findclose(np->n_dirseq, &scred);
 141                         np->n_dirseq = NULL;
 142                         return error == ENOENT ? 0 : error;
 143                 }
 144         }
 145         error = 0;
 146         while (uio->uio_resid > 0 && !error) {
 147                 /*
 148                  * Overestimate the size of a record a bit, doesn't really
 149                  * hurt to be wrong here.
 150                  */
 151                 error = smbfs_findnext(ctx, uio->uio_resid / _DIRENT_RECLEN(255) + 1, &scred);
 152                 if (error)
 153                         break;
 154                 np->n_dirofs++;
 155                 ++offset;
 156
 157                 retval = vop_write_dirent(&error, uio, ctx->f_attr.fa_ino,
 158                     (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG,
 159                     ctx->f_nmlen, ctx->f_name);
 160                 if (retval)
 161                         break;
 162                 if (smbfs_fastlookup && !error) {
 163                         error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
 164                             ctx->f_nmlen, &ctx->f_attr, &newvp);
 165                         if (!error)
 166                                 vput(newvp);
 167                 }
 168         }
 169         if (error == ENOENT)
 170                 error = 0;
 171 done:
 172         uio->uio_offset = offset;
 173         return error;
 174 }
 175
 176 int
 177 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 178 {
 179         struct thread *td;
 180         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 181         struct smbnode *np = VTOSMB(vp);
 182         struct vattr vattr;
 183         struct smb_cred scred;
 184         int error, lks;
 185
 186         /*
 187          * Protect against method which is not supported for now
 188          */
 189         if (uiop->uio_segflg == UIO_NOCOPY)
 190                 return EOPNOTSUPP;
 191
 192         if (vp->v_type != VREG && vp->v_type != VDIR) {
 193                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
 194                 return EIO;
 195         }
 196         if (uiop->uio_resid == 0)
 197                 return 0;
 198         if (uiop->uio_offset < 0)
 199                 return EINVAL;
 200         td = uiop->uio_td;
 201         if (vp->v_type == VDIR) {
 202                 lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, td);*/
 203                 if (lks == LK_SHARED)
 204                         vn_lock(vp, LK_UPGRADE | LK_RETRY);
 205                 error = smbfs_readvdir(vp, uiop, cred);
 206                 if (lks == LK_SHARED)
 207                         vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
 208                 return error;
 209         }
 210
 211 /*      biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
 212         if (np->n_flag & NMODIFIED) {
 213                 smbfs_attr_cacheremove(vp);
 214                 error = VOP_GETATTR(vp, &vattr);
 215                 if (error)
 216                         return error;
 217                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 218         } else {
 219                 error = VOP_GETATTR(vp, &vattr);
 220                 if (error)
 221                         return error;
 222                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
 223                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 224                         if (error)
 225                                 return error;
 226                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 227                 }
 228         }
 229         smb_makescred(&scred, td, cred);
 230         return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 231 }
 232
 233 int
 234 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
 235                  struct ucred *cred, int ioflag)
 236 {
 237         struct thread *td;
 238         struct smbmount *smp = VTOSMBFS(vp);
 239         struct smbnode *np = VTOSMB(vp);
 240         struct smb_cred scred;
 241         int error = 0;
 242
 243         if (vp->v_type != VREG) {
 244                 SMBERROR("vn types other than VREG unsupported !\n");
 245                 return EIO;
 246         }
 247         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 248         if (uiop->uio_offset < 0)
 249                 return EINVAL;
 250         td = uiop->uio_td;
 251         if (ioflag & (IO_APPEND | IO_SYNC)) {
 252                 if (np->n_flag & NMODIFIED) {
 253                         smbfs_attr_cacheremove(vp);
 254                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 255                         if (error)
 256                                 return error;
 257                 }
 258                 if (ioflag & IO_APPEND) {
 259 #if 0 /* notyet */
 260                         /*
 261                          * File size can be changed by another client
 262                          */
 263                         smbfs_attr_cacheremove(vp);
 264                         error = VOP_GETATTR(vp, &vattr);
 265                         if (error) return (error);
 266 #endif
 267                         uiop->uio_offset = np->n_size;
 268                 }
 269         }
 270         if (uiop->uio_resid == 0)
 271                 return 0;
 272         if (td->td_proc &&
 273             uiop->uio_offset + uiop->uio_resid >
 274             td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 275                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 276                 return EFBIG;
 277         }
 278         smb_makescred(&scred, td, cred);
 279         error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 280         SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 281         if (!error) {
 282                 if (uiop->uio_offset > np->n_size) {
 283                         np->n_size = uiop->uio_offset;
 284                         vnode_pager_setsize(vp, np->n_size);
 285                 }
 286         }
 287         return error;
 288 }
 289
 290 /*
 291  * Do an I/O operation to/from a cache block.
 292  */
 293 int
 294 smbfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td)
 295 {
 296         struct buf *bp = bio->bio_buf;
 297         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 298         struct smbnode *np = VTOSMB(vp);
 299         struct uio uio, *uiop = &uio;
 300         struct iovec io;
 301         struct smb_cred scred;
 302         int error = 0;
 303
 304         uiop->uio_iov = &io;
 305         uiop->uio_iovcnt = 1;
 306         uiop->uio_segflg = UIO_SYSSPACE;
 307         uiop->uio_td = td;
 308
 309         smb_makescred(&scred, td, cr);
 310
 311         if (bp->b_cmd == BUF_CMD_READ) {
 312             io.iov_len = uiop->uio_resid = (size_t)bp->b_bcount;
 313             io.iov_base = bp->b_data;
 314             uiop->uio_rw = UIO_READ;
 315             switch (vp->v_type) {
 316               case VREG:
 317                 uiop->uio_offset = bio->bio_offset;
 318                 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 319                 if (error)
 320                         break;
 321                 if (uiop->uio_resid) {
 322                         size_t left = uiop->uio_resid;
 323                         size_t nread = (size_t)bp->b_bcount - left;
 324                         if (left > 0)
 325                                 bzero((char *)bp->b_data + nread, left);
 326                 }
 327                 break;
 328             default:
 329                 kprintf("smbfs_doio:  type %x unexpected\n",vp->v_type);
 330                 break;
 331             }
 332             if (error) {
 333                 bp->b_error = error;
 334                 bp->b_flags |= B_ERROR;
 335             }
 336         } else { /* write */
 337             KKASSERT(bp->b_cmd == BUF_CMD_WRITE);
 338             if (bio->bio_offset + bp->b_dirtyend > np->n_size)
 339                 bp->b_dirtyend = np->n_size - bio->bio_offset;
 340
 341             if (bp->b_dirtyend > bp->b_dirtyoff) {
 342                 io.iov_len = uiop->uio_resid =
 343                         (size_t)(bp->b_dirtyend - bp->b_dirtyoff);
 344                 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff;
 345                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
 346                 uiop->uio_rw = UIO_WRITE;
 347                 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 348
 349                 /*
 350                  * For an interrupted write, the buffer is still valid
 351                  * and the write hasn't been pushed to the server yet,
 352                  * so we can't set BIO_ERROR and report the interruption
 353                  * by setting B_EINTR. For the async case, B_EINTR
 354                  * is not relevant, so the rpc attempt is essentially
 355                  * a noop.  For the case of a V3 write rpc not being
 356                  * committed to stable storage, the block is still
 357                  * dirty and requires either a commit rpc or another
 358                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
 359                  * the block is reused. This is indicated by setting
 360                  * the B_DELWRI and B_NEEDCOMMIT flags.
 361                  */
 362                 if (error == EINTR
 363                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
 364
 365                         crit_enter();
 366                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
 367                         if ((bp->b_flags & B_PAGING) == 0)
 368                             bdirty(bp);
 369                         bp->b_flags |= B_EINTR;
 370                         crit_exit();
 371                 } else {
 372                         if (error) {
 373                                 bp->b_flags |= B_ERROR;
 374                                 bp->b_error = error;
 375                         }
 376                         bp->b_dirtyoff = bp->b_dirtyend = 0;
 377                 }
 378             } else {
 379                 bp->b_resid = 0;
 380                 biodone(bio);
 381                 return 0;
 382             }
 383         }
 384         bp->b_resid = uiop->uio_resid;
 385         biodone(bio);
 386         return error;
 387 }
 388
 389 /*
 390  * Vnode op for VM getpages.
 391  * Wish wish .... get rid from multiple IO routines
 392  *
 393  * smbfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
 394  *                int a_reqpage, vm_ooffset_t a_offset)
 395  */
 396 int
 397 smbfs_getpages(struct vop_getpages_args *ap)
 398 {
 399 #ifdef SMBFS_RWGENERIC
 400         return vop_stdgetpages(ap);
 401 #else
 402         int i, error, npages;
 403         int doclose;
 404         size_t size, toff, nextoff, count;
 405         struct uio uio;
 406         struct iovec iov;
 407         vm_offset_t kva;
 408         struct buf *bp;
 409         struct vnode *vp;
 410         struct thread *td = curthread;  /* XXX */
 411         struct ucred *cred;
 412         struct smbmount *smp;
 413         struct smbnode *np;
 414         struct smb_cred scred;
 415         vm_page_t *pages;
 416
 417         KKASSERT(td->td_proc);
 418
 419         vp = ap->a_vp;
 420         cred = td->td_proc->p_ucred;
 421         np = VTOSMB(vp);
 422         smp = VFSTOSMBFS(vp->v_mount);
 423         pages = ap->a_m;
 424         count = (size_t)ap->a_count;
 425
 426         if (vp->v_object == NULL) {
 427                 kprintf("smbfs_getpages: called with non-merged cache vnode??\n");
 428                 return VM_PAGER_ERROR;
 429         }
 430         smb_makescred(&scred, td, cred);
 431
 432         bp = getpbuf_kva(&smbfs_pbuf_freecnt);
 433         npages = btoc(count);
 434         kva = (vm_offset_t) bp->b_data;
 435         pmap_qenter(kva, pages, npages);
 436
 437         iov.iov_base = (caddr_t) kva;
 438         iov.iov_len = count;
 439         uio.uio_iov = &iov;
 440         uio.uio_iovcnt = 1;
 441         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 442         uio.uio_resid = count;
 443         uio.uio_segflg = UIO_SYSSPACE;
 444         uio.uio_rw = UIO_READ;
 445         uio.uio_td = td;
 446
 447         /*
 448          * This is kinda nasty.  Since smbfs is physically closing the
 449          * fid on close(), we have to reopen it if necessary.  There are
 450          * other races here too, such as if another process opens the same
 451          * file while we are blocked in read. XXX
 452          */
 453         error = 0;
 454         doclose = 0;
 455         if (np->n_opencount == 0) {
 456                 error = smbfs_smb_open(np, SMB_AM_OPENREAD, &scred);
 457                 if (error == 0)
 458                         doclose = 1;
 459         }
 460         if (error == 0)
 461                 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
 462         if (doclose)
 463                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 464         pmap_qremove(kva, npages);
 465
 466         relpbuf(bp, &smbfs_pbuf_freecnt);
 467
 468         if (error && (uio.uio_resid == count)) {
 469                 kprintf("smbfs_getpages: error %d\n",error);
 470                 for (i = 0; i < npages; i++) {
 471                         if (ap->a_reqpage != i)
 472                                 vnode_pager_freepage(pages[i]);
 473                 }
 474                 return VM_PAGER_ERROR;
 475         }
 476
 477         size = count - uio.uio_resid;
 478
 479         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
 480                 vm_page_t m;
 481                 nextoff = toff + PAGE_SIZE;
 482                 m = pages[i];
 483
 484                 /*
 485                  * NOTE: pmap dirty bit should have already been cleared.
 486                  *       We do not clear it here.
 487                  */
 488                 if (nextoff <= size) {
 489                         m->valid = VM_PAGE_BITS_ALL;
 490                         m->dirty = 0;
 491                 } else {
 492                         int nvalid = rounddown2((size + DEV_BSIZE - 1) - toff,
 493                             DEV_BSIZE);
 494                         vm_page_set_validclean(m, 0, nvalid);
 495                 }
 496
 497                 if (i != ap->a_reqpage) {
 498                         /*
 499                          * Whether or not to leave the page activated is up in
 500                          * the air, but we should put the page on a page queue
 501                          * somewhere (it already is in the object).  Result:
 502                          * It appears that emperical results show that
 503                          * deactivating pages is best.
 504                          */
 505
 506                         /*
 507                          * Just in case someone was asking for this page we
 508                          * now tell them that it is ok to use.
 509                          */
 510                         if (!error) {
 511                                 if (m->flags & PG_REFERENCED)
 512                                         vm_page_activate(m);
 513                                 else
 514                                         vm_page_deactivate(m);
 515                                 vm_page_wakeup(m);
 516                         } else {
 517                                 vnode_pager_freepage(m);
 518                         }
 519                 }
 520         }
 521         return 0;
 522 #endif /* SMBFS_RWGENERIC */
 523 }
 524
 525 /*
 526  * Vnode op for VM putpages.
 527  * possible bug: all IO done in sync mode
 528  * Note that vop_close always invalidate pages before close, so it's
 529  * not necessary to open vnode.
 530  *
 531  * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_flags,
 532  *                int *a_rtvals, vm_ooffset_t a_offset)
 533  */
 534 int
 535 smbfs_putpages(struct vop_putpages_args *ap)
 536 {
 537         int error;
 538         struct vnode *vp = ap->a_vp;
 539         struct thread *td = curthread;  /* XXX */
 540         struct ucred *cred;
 541
 542 #ifdef SMBFS_RWGENERIC
 543         KKASSERT(td->td_proc);
 544         cred = td->td_proc->p_ucred;
 545         VOP_OPEN(vp, FWRITE, cred, NULL);
 546         error = vop_stdputpages(ap);
 547         VOP_CLOSE(vp, FWRITE, cred, NULL);
 548         return error;
 549 #else
 550         struct uio uio;
 551         struct iovec iov;
 552         vm_offset_t kva;
 553         struct buf *bp;
 554         int i, npages, count;
 555         int doclose;
 556         int *rtvals;
 557         struct smbmount *smp;
 558         struct smbnode *np;
 559         struct smb_cred scred;
 560         vm_page_t *pages;
 561
 562         KKASSERT(td->td_proc);
 563         cred = td->td_proc->p_ucred;
 564 /*      VOP_OPEN(vp, FWRITE, cred, NULL);*/
 565         np = VTOSMB(vp);
 566         smp = VFSTOSMBFS(vp->v_mount);
 567         pages = ap->a_m;
 568         count = ap->a_count;
 569         rtvals = ap->a_rtvals;
 570         npages = btoc(count);
 571
 572         for (i = 0; i < npages; i++) {
 573                 rtvals[i] = VM_PAGER_AGAIN;
 574         }
 575
 576         bp = getpbuf_kva(&smbfs_pbuf_freecnt);
 577         kva = (vm_offset_t) bp->b_data;
 578         pmap_qenter(kva, pages, npages);
 579
 580         iov.iov_base = (caddr_t) kva;
 581         iov.iov_len = count;
 582         uio.uio_iov = &iov;
 583         uio.uio_iovcnt = 1;
 584         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 585         uio.uio_resid = count;
 586         uio.uio_segflg = UIO_SYSSPACE;
 587         uio.uio_rw = UIO_WRITE;
 588         uio.uio_td = td;
 589         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
 590
 591         smb_makescred(&scred, td, cred);
 592
 593         /*
 594          * This is kinda nasty.  Since smbfs is physically closing the
 595          * fid on close(), we have to reopen it if necessary.  There are
 596          * other races here too, such as if another process opens the same
 597          * file while we are blocked in read, or the file is open read-only
 598          * XXX
 599          */
 600         error = 0;
 601         doclose = 0;
 602         if (np->n_opencount == 0) {
 603                 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
 604                 if (error == 0)
 605                         doclose = 1;
 606         }
 607         if (error == 0)
 608                 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
 609         if (doclose)
 610                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 611 /*      VOP_CLOSE(vp, FWRITE, cred);*/
 612         SMBVDEBUG("paged write done: %d\n", error);
 613
 614         pmap_qremove(kva, npages);
 615         relpbuf(bp, &smbfs_pbuf_freecnt);
 616
 617         if (!error) {
 618                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
 619                 for (i = 0; i < nwritten; i++) {
 620                         rtvals[i] = VM_PAGER_OK;
 621                         vm_page_undirty(pages[i]);
 622                 }
 623         }
 624         return rtvals[0];
 625 #endif /* SMBFS_RWGENERIC */
 626 }
 627
 628 /*
 629  * Flush and invalidate all dirty buffers. If another process is already
 630  * doing the flush, just wait for completion.
 631  */
 632 int
 633 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
 634 {
 635         struct smbnode *np = VTOSMB(vp);
 636         int error = 0, slpflag, slptimeo;
 637
 638         if (vp->v_flag & VRECLAIMED)
 639                 return 0;
 640         if (intrflg) {
 641                 slpflag = PCATCH;
 642                 slptimeo = 2 * hz;
 643         } else {
 644                 slpflag = 0;
 645                 slptimeo = 0;
 646         }
 647         while (np->n_flag & NFLUSHINPROG) {
 648                 np->n_flag |= NFLUSHWANT;
 649                 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo);
 650                 error = smb_proc_intr(curthread);
 651                 if (error == EINTR && intrflg)
 652                         return EINTR;
 653         }
 654         np->n_flag |= NFLUSHINPROG;
 655         error = vinvalbuf(vp, flags, slpflag, 0);
 656         while (error) {
 657                 if (intrflg && (error == ERESTART || error == EINTR)) {
 658                         np->n_flag &= ~NFLUSHINPROG;
 659                         if (np->n_flag & NFLUSHWANT) {
 660                                 np->n_flag &= ~NFLUSHWANT;
 661                                 wakeup((caddr_t)&np->n_flag);
 662                         }
 663                         return EINTR;
 664                 }
 665                 error = vinvalbuf(vp, flags, slpflag, 0);
 666         }
 667         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
 668         if (np->n_flag & NFLUSHWANT) {
 669                 np->n_flag &= ~NFLUSHWANT;
 670                 wakeup((caddr_t)&np->n_flag);
 671         }
 672         return (error);
 673 }