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  * $DragonFly: src/sys/vfs/smbfs/smbfs_io.c,v 1.29 2007/08/28 01:04:33 dillon 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/proc.h>
  41 #include <sys/fcntl.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  <machine/limits.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/vm_page.h>
  53 #include <vm/vm_extern.h>
  54 #include <vm/vm_object.h>
  55 #include <vm/vm_pager.h>
  56 #include <vm/vnode_pager.h>
  57
  58 #include <netproto/smb/smb.h>
  59 #include <netproto/smb/smb_conn.h>
  60 #include <netproto/smb/smb_subr.h>
  61
  62 #include "smbfs.h"
  63 #include "smbfs_node.h"
  64 #include "smbfs_subr.h"
  65
  66 #include <sys/buf.h>
  67
  68 #include <sys/thread2.h>
  69
  70 /*#define SMBFS_RWGENERIC*/
  71
  72 extern int smbfs_pbuf_freecnt;
  73
  74 static int smbfs_fastlookup = 1;
  75
  76 SYSCTL_DECL(_vfs_smbfs);
  77 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
  78
  79 static int
  80 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
  81 {
  82         struct smb_cred scred;
  83         struct smbfs_fctx *ctx;
  84         struct vnode *newvp;
  85         struct smbnode *np;
  86         int error, offset, retval;
  87
  88         np = VTOSMB(vp);
  89         SMBVDEBUG("dirname='%s'\n", np->n_name);
  90         smb_makescred(&scred, uio->uio_td, cred);
  91
  92         if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX)
  93                 return(EINVAL);
  94
  95         error = 0;
  96         offset = uio->uio_offset;
  97
  98         if (uio->uio_resid > 0 && offset < 1) {
  99                 if (vop_write_dirent(&error, uio, np->n_ino, DT_DIR, 1, "."))
 100                         goto done;
 101                 if (error)
 102                         goto done;
 103                 ++offset;
 104         }
 105
 106         if (uio->uio_resid > 0 && offset < 2) {
 107                 if (vop_write_dirent(&error, uio,
 108                     np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2,
 109                     DT_DIR, 2, ".."))
 110                         goto done;
 111                 if (error)
 112                         goto done;
 113                 ++offset;
 114         }
 115
 116         if (uio->uio_resid == 0)
 117                 goto done;
 118
 119         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
 120                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
 121                 if (np->n_dirseq) {
 122                         smbfs_findclose(np->n_dirseq, &scred);
 123                         np->n_dirseq = NULL;
 124                 }
 125                 np->n_dirofs = 2;
 126                 error = smbfs_findopen(np, "*", 1,
 127                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
 128                     &scred, &ctx);
 129                 if (error) {
 130                         SMBVDEBUG("can not open search, error = %d", error);
 131                         return error;
 132                 }
 133                 np->n_dirseq = ctx;
 134         } else {
 135                 ctx = np->n_dirseq;
 136         }
 137         while (np->n_dirofs < offset) {
 138                 error = smbfs_findnext(ctx, offset - np->n_dirofs, &scred);
 139                 ++np->n_dirofs;
 140                 if (error) {
 141                         smbfs_findclose(np->n_dirseq, &scred);
 142                         np->n_dirseq = NULL;
 143                         return error == ENOENT ? 0 : error;
 144                 }
 145         }
 146         error = 0;
 147         while (uio->uio_resid > 0 && !error) {
 148                 /*
 149                  * Overestimate the size of a record a bit, doesn't really
 150                  * hurt to be wrong here.
 151                  */
 152                 error = smbfs_findnext(ctx, uio->uio_resid / _DIRENT_RECLEN(255) + 1, &scred);
 153                 if (error)
 154                         break;
 155                 np->n_dirofs++;
 156                 ++offset;
 157
 158                 retval = vop_write_dirent(&error, uio, ctx->f_attr.fa_ino,
 159                     (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG,
 160                     ctx->f_nmlen, ctx->f_name);
 161                 if (retval)
 162                         break;
 163                 if (smbfs_fastlookup && !error) {
 164                         error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
 165                             ctx->f_nmlen, &ctx->f_attr, &newvp);
 166                         if (!error)
 167                                 vput(newvp);
 168                 }
 169         }
 170         if (error == ENOENT)
 171                 error = 0;
 172 done:
 173         uio->uio_offset = offset;
 174         return error;
 175 }
 176
 177 int
 178 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 179 {
 180         struct thread *td;
 181         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 182         struct smbnode *np = VTOSMB(vp);
 183         struct vattr vattr;
 184         struct smb_cred scred;
 185         int error, lks;
 186
 187         /*
 188          * Protect against method which is not supported for now
 189          */
 190         if (uiop->uio_segflg == UIO_NOCOPY)
 191                 return EOPNOTSUPP;
 192
 193         if (vp->v_type != VREG && vp->v_type != VDIR) {
 194                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
 195                 return EIO;
 196         }
 197         if (uiop->uio_resid == 0)
 198                 return 0;
 199         if (uiop->uio_offset < 0)
 200                 return EINVAL;
 201         td = uiop->uio_td;
 202         if (vp->v_type == VDIR) {
 203                 lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, td);*/
 204                 if (lks == LK_SHARED)
 205                         vn_lock(vp, LK_UPGRADE | LK_RETRY);
 206                 error = smbfs_readvdir(vp, uiop, cred);
 207                 if (lks == LK_SHARED)
 208                         vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
 209                 return error;
 210         }
 211
 212 /*      biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
 213         if (np->n_flag & NMODIFIED) {
 214                 smbfs_attr_cacheremove(vp);
 215                 error = VOP_GETATTR(vp, &vattr);
 216                 if (error)
 217                         return error;
 218                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 219         } else {
 220                 error = VOP_GETATTR(vp, &vattr);
 221                 if (error)
 222                         return error;
 223                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
 224                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 225                         if (error)
 226                                 return error;
 227                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 228                 }
 229         }
 230         smb_makescred(&scred, td, cred);
 231         return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 232 }
 233
 234 int
 235 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
 236                  struct ucred *cred, int ioflag)
 237 {
 238         struct thread *td;
 239         struct smbmount *smp = VTOSMBFS(vp);
 240         struct smbnode *np = VTOSMB(vp);
 241         struct smb_cred scred;
 242         int error = 0;
 243
 244         if (vp->v_type != VREG) {
 245                 SMBERROR("vn types other than VREG unsupported !\n");
 246                 return EIO;
 247         }
 248         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 249         if (uiop->uio_offset < 0)
 250                 return EINVAL;
 251         td = uiop->uio_td;
 252         if (ioflag & (IO_APPEND | IO_SYNC)) {
 253                 if (np->n_flag & NMODIFIED) {
 254                         smbfs_attr_cacheremove(vp);
 255                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 256                         if (error)
 257                                 return error;
 258                 }
 259                 if (ioflag & IO_APPEND) {
 260 #if notyet
 261                         /*
 262                          * File size can be changed by another client
 263                          */
 264                         smbfs_attr_cacheremove(vp);
 265                         error = VOP_GETATTR(vp, &vattr);
 266                         if (error) return (error);
 267 #endif
 268                         uiop->uio_offset = np->n_size;
 269                 }
 270         }
 271         if (uiop->uio_resid == 0)
 272                 return 0;
 273         if (td->td_proc &&
 274             uiop->uio_offset + uiop->uio_resid >
 275             td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 276                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 277                 return EFBIG;
 278         }
 279         smb_makescred(&scred, td, cred);
 280         error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 281         SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 282         if (!error) {
 283                 if (uiop->uio_offset > np->n_size) {
 284                         np->n_size = uiop->uio_offset;
 285                         vnode_pager_setsize(vp, np->n_size);
 286                 }
 287         }
 288         return error;
 289 }
 290
 291 /*
 292  * Do an I/O operation to/from a cache block.
 293  */
 294 int
 295 smbfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td)
 296 {
 297         struct buf *bp = bio->bio_buf;
 298         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 299         struct smbnode *np = VTOSMB(vp);
 300         struct uio uio, *uiop = &uio;
 301         struct iovec io;
 302         struct smb_cred scred;
 303         int error = 0;
 304
 305         uiop->uio_iov = &io;
 306         uiop->uio_iovcnt = 1;
 307         uiop->uio_segflg = UIO_SYSSPACE;
 308         uiop->uio_td = td;
 309
 310         smb_makescred(&scred, td, cr);
 311
 312         if (bp->b_cmd == BUF_CMD_READ) {
 313             io.iov_len = uiop->uio_resid = (size_t)bp->b_bcount;
 314             io.iov_base = bp->b_data;
 315             uiop->uio_rw = UIO_READ;
 316             switch (vp->v_type) {
 317               case VREG:
 318                 uiop->uio_offset = bio->bio_offset;
 319                 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 320                 if (error)
 321                         break;
 322                 if (uiop->uio_resid) {
 323                         size_t left = uiop->uio_resid;
 324                         size_t nread = (size_t)bp->b_bcount - left;
 325                         if (left > 0)
 326                                 bzero((char *)bp->b_data + nread, left);
 327                 }
 328                 break;
 329             default:
 330                 kprintf("smbfs_doio:  type %x unexpected\n",vp->v_type);
 331                 break;
 332             };
 333             if (error) {
 334                 bp->b_error = error;
 335                 bp->b_flags |= B_ERROR;
 336             }
 337         } else { /* write */
 338             KKASSERT(bp->b_cmd == BUF_CMD_WRITE);
 339             if (bio->bio_offset + bp->b_dirtyend > np->n_size)
 340                 bp->b_dirtyend = np->n_size - bio->bio_offset;
 341
 342             if (bp->b_dirtyend > bp->b_dirtyoff) {
 343                 io.iov_len = uiop->uio_resid =
 344                         (size_t)(bp->b_dirtyend - bp->b_dirtyoff);
 345                 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff;
 346                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
 347                 uiop->uio_rw = UIO_WRITE;
 348                 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 349
 350                 /*
 351                  * For an interrupted write, the buffer is still valid
 352                  * and the write hasn't been pushed to the server yet,
 353                  * so we can't set BIO_ERROR and report the interruption
 354                  * by setting B_EINTR. For the async case, B_EINTR
 355                  * is not relevant, so the rpc attempt is essentially
 356                  * a noop.  For the case of a V3 write rpc not being
 357                  * committed to stable storage, the block is still
 358                  * dirty and requires either a commit rpc or another
 359                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
 360                  * the block is reused. This is indicated by setting
 361                  * the B_DELWRI and B_NEEDCOMMIT flags.
 362                  */
 363                 if (error == EINTR
 364                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
 365
 366                         crit_enter();
 367                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
 368                         if ((bp->b_flags & B_PAGING) == 0)
 369                             bdirty(bp);
 370                         bp->b_flags |= B_EINTR;
 371                         crit_exit();
 372                 } else {
 373                         if (error) {
 374                                 bp->b_flags |= B_ERROR;
 375                                 bp->b_error = error;
 376                         }
 377                         bp->b_dirtyoff = bp->b_dirtyend = 0;
 378                 }
 379             } else {
 380                 bp->b_resid = 0;
 381                 biodone(bio);
 382                 return 0;
 383             }
 384         }
 385         bp->b_resid = uiop->uio_resid;
 386         biodone(bio);
 387         return error;
 388 }
 389
 390 /*
 391  * Vnode op for VM getpages.
 392  * Wish wish .... get rid from multiple IO routines
 393  *
 394  * smbfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
 395  *                int a_reqpage, vm_ooffset_t a_offset)
 396  */
 397 int
 398 smbfs_getpages(struct vop_getpages_args *ap)
 399 {
 400 #ifdef SMBFS_RWGENERIC
 401         return vop_stdgetpages(ap);
 402 #else
 403         int i, error, npages;
 404         int doclose;
 405         size_t size, toff, nextoff, count;
 406         struct uio uio;
 407         struct iovec iov;
 408         vm_offset_t kva;
 409         struct buf *bp;
 410         struct vnode *vp;
 411         struct thread *td = curthread;  /* XXX */
 412         struct ucred *cred;
 413         struct smbmount *smp;
 414         struct smbnode *np;
 415         struct smb_cred scred;
 416         vm_page_t *pages;
 417
 418         KKASSERT(td->td_proc);
 419
 420         vp = ap->a_vp;
 421         cred = td->td_proc->p_ucred;
 422         np = VTOSMB(vp);
 423         smp = VFSTOSMBFS(vp->v_mount);
 424         pages = ap->a_m;
 425         count = (size_t)ap->a_count;
 426
 427         if (vp->v_object == NULL) {
 428                 kprintf("smbfs_getpages: called with non-merged cache vnode??\n");
 429                 return VM_PAGER_ERROR;
 430         }
 431         smb_makescred(&scred, td, cred);
 432
 433         bp = getpbuf(&smbfs_pbuf_freecnt);
 434         npages = btoc(count);
 435         kva = (vm_offset_t) bp->b_data;
 436         pmap_qenter(kva, pages, npages);
 437
 438         iov.iov_base = (caddr_t) kva;
 439         iov.iov_len = count;
 440         uio.uio_iov = &iov;
 441         uio.uio_iovcnt = 1;
 442         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 443         uio.uio_resid = count;
 444         uio.uio_segflg = UIO_SYSSPACE;
 445         uio.uio_rw = UIO_READ;
 446         uio.uio_td = td;
 447
 448         /*
 449          * This is kinda nasty.  Since smbfs is physically closing the
 450          * fid on close(), we have to reopen it if necessary.  There are
 451          * other races here too, such as if another process opens the same
 452          * file while we are blocked in read. XXX
 453          */
 454         error = 0;
 455         doclose = 0;
 456         if (np->n_opencount == 0) {
 457                 error = smbfs_smb_open(np, SMB_AM_OPENREAD, &scred);
 458                 if (error == 0)
 459                         doclose = 1;
 460         }
 461         if (error == 0)
 462                 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
 463         if (doclose)
 464                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 465         pmap_qremove(kva, npages);
 466
 467         relpbuf(bp, &smbfs_pbuf_freecnt);
 468
 469         if (error && (uio.uio_resid == count)) {
 470                 kprintf("smbfs_getpages: error %d\n",error);
 471                 for (i = 0; i < npages; i++) {
 472                         if (ap->a_reqpage != i)
 473                                 vnode_pager_freepage(pages[i]);
 474                 }
 475                 return VM_PAGER_ERROR;
 476         }
 477
 478         size = count - uio.uio_resid;
 479
 480         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
 481                 vm_page_t m;
 482                 nextoff = toff + PAGE_SIZE;
 483                 m = pages[i];
 484
 485                 m->flags &= ~PG_ZERO;
 486
 487                 /*
 488                  * NOTE: pmap dirty bit should have already been cleared.
 489                  *       We do not clear it here.
 490                  */
 491                 if (nextoff <= size) {
 492                         m->valid = VM_PAGE_BITS_ALL;
 493                         m->dirty = 0;
 494                 } else {
 495                         int nvalid = ((size + DEV_BSIZE - 1) - toff) &
 496                                       ~(DEV_BSIZE - 1);
 497                         vm_page_set_validclean(m, 0, nvalid);
 498                 }
 499
 500                 if (i != ap->a_reqpage) {
 501                         /*
 502                          * Whether or not to leave the page activated is up in
 503                          * the air, but we should put the page on a page queue
 504                          * somewhere (it already is in the object).  Result:
 505                          * It appears that emperical results show that
 506                          * deactivating pages is best.
 507                          */
 508
 509                         /*
 510                          * Just in case someone was asking for this page we
 511                          * now tell them that it is ok to use.
 512                          */
 513                         if (!error) {
 514                                 if (m->flags & PG_WANTED)
 515                                         vm_page_activate(m);
 516                                 else
 517                                         vm_page_deactivate(m);
 518                                 vm_page_wakeup(m);
 519                         } else {
 520                                 vnode_pager_freepage(m);
 521                         }
 522                 }
 523         }
 524         return 0;
 525 #endif /* SMBFS_RWGENERIC */
 526 }
 527
 528 /*
 529  * Vnode op for VM putpages.
 530  * possible bug: all IO done in sync mode
 531  * Note that vop_close always invalidate pages before close, so it's
 532  * not necessary to open vnode.
 533  *
 534  * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_sync,
 535  *                int *a_rtvals, vm_ooffset_t a_offset)
 536  */
 537 int
 538 smbfs_putpages(struct vop_putpages_args *ap)
 539 {
 540         int error;
 541         struct vnode *vp = ap->a_vp;
 542         struct thread *td = curthread;  /* XXX */
 543         struct ucred *cred;
 544
 545 #ifdef SMBFS_RWGENERIC
 546         KKASSERT(td->td_proc);
 547         cred = td->td_proc->p_ucred;
 548         VOP_OPEN(vp, FWRITE, cred, NULL);
 549         error = vop_stdputpages(ap);
 550         VOP_CLOSE(vp, FWRITE, cred);
 551         return error;
 552 #else
 553         struct uio uio;
 554         struct iovec iov;
 555         vm_offset_t kva;
 556         struct buf *bp;
 557         int i, npages, count;
 558         int doclose;
 559         int *rtvals;
 560         struct smbmount *smp;
 561         struct smbnode *np;
 562         struct smb_cred scred;
 563         vm_page_t *pages;
 564
 565         KKASSERT(td->td_proc);
 566         cred = td->td_proc->p_ucred;
 567 /*      VOP_OPEN(vp, FWRITE, cred, NULL);*/
 568         np = VTOSMB(vp);
 569         smp = VFSTOSMBFS(vp->v_mount);
 570         pages = ap->a_m;
 571         count = ap->a_count;
 572         rtvals = ap->a_rtvals;
 573         npages = btoc(count);
 574
 575         for (i = 0; i < npages; i++) {
 576                 rtvals[i] = VM_PAGER_AGAIN;
 577         }
 578
 579         bp = getpbuf(&smbfs_pbuf_freecnt);
 580         kva = (vm_offset_t) bp->b_data;
 581         pmap_qenter(kva, pages, npages);
 582
 583         iov.iov_base = (caddr_t) kva;
 584         iov.iov_len = count;
 585         uio.uio_iov = &iov;
 586         uio.uio_iovcnt = 1;
 587         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 588         uio.uio_resid = count;
 589         uio.uio_segflg = UIO_SYSSPACE;
 590         uio.uio_rw = UIO_WRITE;
 591         uio.uio_td = td;
 592         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
 593
 594         smb_makescred(&scred, td, cred);
 595
 596         /*
 597          * This is kinda nasty.  Since smbfs is physically closing the
 598          * fid on close(), we have to reopen it if necessary.  There are
 599          * other races here too, such as if another process opens the same
 600          * file while we are blocked in read, or the file is open read-only
 601          * XXX
 602          */
 603         error = 0;
 604         doclose = 0;
 605         if (np->n_opencount == 0) {
 606                 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
 607                 if (error == 0)
 608                         doclose = 1;
 609         }
 610         if (error == 0)
 611                 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
 612         if (doclose)
 613                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 614 /*      VOP_CLOSE(vp, FWRITE, cred);*/
 615         SMBVDEBUG("paged write done: %d\n", error);
 616
 617         pmap_qremove(kva, npages);
 618         relpbuf(bp, &smbfs_pbuf_freecnt);
 619
 620         if (!error) {
 621                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
 622                 for (i = 0; i < nwritten; i++) {
 623                         rtvals[i] = VM_PAGER_OK;
 624                         vm_page_undirty(pages[i]);
 625                 }
 626         }
 627         return rtvals[0];
 628 #endif /* SMBFS_RWGENERIC */
 629 }
 630
 631 /*
 632  * Flush and invalidate all dirty buffers. If another process is already
 633  * doing the flush, just wait for completion.
 634  */
 635 int
 636 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
 637 {
 638         struct smbnode *np = VTOSMB(vp);
 639         int error = 0, slpflag, slptimeo;
 640
 641         if (vp->v_flag & VRECLAIMED)
 642                 return 0;
 643         if (intrflg) {
 644                 slpflag = PCATCH;
 645                 slptimeo = 2 * hz;
 646         } else {
 647                 slpflag = 0;
 648                 slptimeo = 0;
 649         }
 650         while (np->n_flag & NFLUSHINPROG) {
 651                 np->n_flag |= NFLUSHWANT;
 652                 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo);
 653                 error = smb_proc_intr(curthread);
 654                 if (error == EINTR && intrflg)
 655                         return EINTR;
 656         }
 657         np->n_flag |= NFLUSHINPROG;
 658         error = vinvalbuf(vp, flags, slpflag, 0);
 659         while (error) {
 660                 if (intrflg && (error == ERESTART || error == EINTR)) {
 661                         np->n_flag &= ~NFLUSHINPROG;
 662                         if (np->n_flag & NFLUSHWANT) {
 663                                 np->n_flag &= ~NFLUSHWANT;
 664                                 wakeup((caddr_t)&np->n_flag);
 665                         }
 666                         return EINTR;
 667                 }
 668                 error = vinvalbuf(vp, flags, slpflag, 0);
 669         }
 670         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
 671         if (np->n_flag & NFLUSHWANT) {
 672                 np->n_flag &= ~NFLUSHWANT;
 673                 wakeup((caddr_t)&np->n_flag);
 674         }
 675         return (error);
 676 }