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 <sys/ioccom.h>
  59 */
  60 #include <netproto/smb/smb.h>
  61 #include <netproto/smb/smb_conn.h>
  62 #include <netproto/smb/smb_subr.h>
  63
  64 #include "smbfs.h"
  65 #include "smbfs_node.h"
  66 #include "smbfs_subr.h"
  67
  68 #include <sys/buf.h>
  69
  70 #include <sys/thread2.h>
  71
  72 /*#define SMBFS_RWGENERIC*/
  73
  74 extern int smbfs_pbuf_freecnt;
  75
  76 static int smbfs_fastlookup = 1;
  77
  78 SYSCTL_DECL(_vfs_smbfs);
  79 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
  80
  81 static int
  82 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
  83 {
  84         struct smb_cred scred;
  85         struct smbfs_fctx *ctx;
  86         struct vnode *newvp;
  87         struct smbnode *np = VTOSMB(vp);
  88         int error, offset, retval/*, *eofflag = ap->a_eofflag*/;
  89
  90         np = VTOSMB(vp);
  91         SMBVDEBUG("dirname='%s'\n", np->n_name);
  92         smb_makescred(&scred, uio->uio_td, cred);
  93
  94         if (uio->uio_resid < 0 || uio->uio_offset < 0 ||
  95             uio->uio_offset > INT_MAX)
  96                 return(EINVAL);
  97
  98         error = 0;
  99         offset = uio->uio_offset;
 100
 101         if (uio->uio_resid > 0 && offset < 1) {
 102                 if (vop_write_dirent(&error, uio, np->n_ino, DT_DIR, 1, "."))
 103                         goto done;
 104                 if (error)
 105                         goto done;
 106                 ++offset;
 107         }
 108
 109         if (uio->uio_resid > 0 && offset < 2) {
 110                 if (vop_write_dirent(&error, uio,
 111                     np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2,
 112                     DT_DIR, 2, ".."))
 113                         goto done;
 114                 if (error)
 115                         goto done;
 116                 ++offset;
 117         }
 118
 119         if (uio->uio_resid == 0)
 120                 goto done;
 121
 122         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
 123                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
 124                 if (np->n_dirseq) {
 125                         smbfs_findclose(np->n_dirseq, &scred);
 126                         np->n_dirseq = NULL;
 127                 }
 128                 np->n_dirofs = 2;
 129                 error = smbfs_findopen(np, "*", 1,
 130                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
 131                     &scred, &ctx);
 132                 if (error) {
 133                         SMBVDEBUG("can not open search, error = %d", error);
 134                         return error;
 135                 }
 136                 np->n_dirseq = ctx;
 137         } else {
 138                 ctx = np->n_dirseq;
 139         }
 140         while (np->n_dirofs < offset) {
 141                 error = smbfs_findnext(ctx, offset - np->n_dirofs, &scred);
 142                 ++np->n_dirofs;
 143                 if (error) {
 144                         smbfs_findclose(np->n_dirseq, &scred);
 145                         np->n_dirseq = NULL;
 146                         return error == ENOENT ? 0 : error;
 147                 }
 148         }
 149         error = 0;
 150         while (uio->uio_resid > 0 && !error) {
 151                 /*
 152                  * Overestimate the size of a record a bit, doesn't really
 153                  * hurt to be wrong here.
 154                  */
 155                 error = smbfs_findnext(ctx, uio->uio_resid / _DIRENT_RECLEN(255) + 1, &scred);
 156                 if (error)
 157                         break;
 158                 np->n_dirofs++;
 159                 ++offset;
 160
 161                 retval = vop_write_dirent(&error, uio, ctx->f_attr.fa_ino,
 162                     (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG,
 163                     ctx->f_nmlen, ctx->f_name);
 164                 if (retval)
 165                         break;
 166                 if (smbfs_fastlookup && !error) {
 167                         error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
 168                             ctx->f_nmlen, &ctx->f_attr, &newvp);
 169                         if (!error)
 170                                 vput(newvp);
 171                 }
 172         }
 173         if (error == ENOENT)
 174                 error = 0;
 175 done:
 176         uio->uio_offset = offset;
 177         return error;
 178 }
 179
 180 int
 181 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 182 {
 183         struct thread *td;
 184         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 185         struct smbnode *np = VTOSMB(vp);
 186         struct vattr vattr;
 187         struct smb_cred scred;
 188         int error, lks;
 189
 190         /*
 191          * Protect against method which is not supported for now
 192          */
 193         if (uiop->uio_segflg == UIO_NOCOPY)
 194                 return EOPNOTSUPP;
 195
 196         if (vp->v_type != VREG && vp->v_type != VDIR) {
 197                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
 198                 return EIO;
 199         }
 200         if (uiop->uio_resid == 0)
 201                 return 0;
 202         if (uiop->uio_offset < 0)
 203                 return EINVAL;
 204 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
 205                 return EFBIG;*/
 206         td = uiop->uio_td;
 207         if (vp->v_type == VDIR) {
 208                 lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, td);*/
 209                 if (lks == LK_SHARED)
 210                         vn_lock(vp, LK_UPGRADE | LK_RETRY);
 211                 error = smbfs_readvdir(vp, uiop, cred);
 212                 if (lks == LK_SHARED)
 213                         vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
 214                 return error;
 215         }
 216
 217 /*      biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
 218         if (np->n_flag & NMODIFIED) {
 219                 smbfs_attr_cacheremove(vp);
 220                 error = VOP_GETATTR(vp, &vattr);
 221                 if (error)
 222                         return error;
 223                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 224         } else {
 225                 error = VOP_GETATTR(vp, &vattr);
 226                 if (error)
 227                         return error;
 228                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
 229                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 230                         if (error)
 231                                 return error;
 232                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
 233                 }
 234         }
 235         smb_makescred(&scred, td, cred);
 236         return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 237 }
 238
 239 int
 240 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
 241                  struct ucred *cred, int ioflag)
 242 {
 243         struct thread *td;
 244         struct smbmount *smp = VTOSMBFS(vp);
 245         struct smbnode *np = VTOSMB(vp);
 246         struct smb_cred scred;
 247         int error = 0;
 248
 249         if (vp->v_type != VREG) {
 250                 SMBERROR("vn types other than VREG unsupported !\n");
 251                 return EIO;
 252         }
 253         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 254         if (uiop->uio_offset < 0)
 255                 return EINVAL;
 256 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
 257                 return (EFBIG);*/
 258         td = uiop->uio_td;
 259         if (ioflag & (IO_APPEND | IO_SYNC)) {
 260                 if (np->n_flag & NMODIFIED) {
 261                         smbfs_attr_cacheremove(vp);
 262                         error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 263                         if (error)
 264                                 return error;
 265                 }
 266                 if (ioflag & IO_APPEND) {
 267 #if notyet
 268                         /*
 269                          * File size can be changed by another client
 270                          */
 271                         smbfs_attr_cacheremove(vp);
 272                         error = VOP_GETATTR(vp, &vattr);
 273                         if (error) return (error);
 274 #endif
 275                         uiop->uio_offset = np->n_size;
 276                 }
 277         }
 278         if (uiop->uio_resid == 0)
 279                 return 0;
 280         if (td->td_proc &&
 281             uiop->uio_offset + uiop->uio_resid >
 282             td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 283                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 284                 return EFBIG;
 285         }
 286         smb_makescred(&scred, td, cred);
 287         error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 288         SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
 289         if (!error) {
 290                 if (uiop->uio_offset > np->n_size) {
 291                         np->n_size = uiop->uio_offset;
 292                         vnode_pager_setsize(vp, np->n_size);
 293                 }
 294         }
 295         return error;
 296 }
 297
 298 /*
 299  * Do an I/O operation to/from a cache block.
 300  */
 301 int
 302 smbfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td)
 303 {
 304         struct buf *bp = bio->bio_buf;
 305         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
 306         struct smbnode *np = VTOSMB(vp);
 307         struct uio uio, *uiop = &uio;
 308         struct iovec io;
 309         struct smb_cred scred;
 310         int error = 0;
 311
 312         uiop->uio_iov = &io;
 313         uiop->uio_iovcnt = 1;
 314         uiop->uio_segflg = UIO_SYSSPACE;
 315         uiop->uio_td = td;
 316
 317         smb_makescred(&scred, td, cr);
 318
 319         if (bp->b_cmd == BUF_CMD_READ) {
 320             io.iov_len = uiop->uio_resid = bp->b_bcount;
 321             io.iov_base = bp->b_data;
 322             uiop->uio_rw = UIO_READ;
 323             switch (vp->v_type) {
 324               case VREG:
 325                 uiop->uio_offset = bio->bio_offset;
 326                 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
 327                 if (error)
 328                         break;
 329                 if (uiop->uio_resid) {
 330                         int left = uiop->uio_resid;
 331                         int nread = bp->b_bcount - left;
 332                         if (left > 0)
 333                             bzero((char *)bp->b_data + nread, left);
 334                 }
 335                 break;
 336             default:
 337                 kprintf("smbfs_doio:  type %x unexpected\n",vp->v_type);
 338                 break;
 339             };
 340             if (error) {
 341                 bp->b_error = error;
 342                 bp->b_flags |= B_ERROR;
 343             }
 344         } else { /* write */
 345             KKASSERT(bp->b_cmd == BUF_CMD_WRITE);
 346             if (bio->bio_offset + bp->b_dirtyend > np->n_size)
 347                 bp->b_dirtyend = np->n_size - bio->bio_offset;
 348
 349             if (bp->b_dirtyend > bp->b_dirtyoff) {
 350                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
 351                 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff;
 352                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
 353                 uiop->uio_rw = UIO_WRITE;
 354                 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
 355
 356                 /*
 357                  * For an interrupted write, the buffer is still valid
 358                  * and the write hasn't been pushed to the server yet,
 359                  * so we can't set BIO_ERROR and report the interruption
 360                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
 361                  * is not relevant, so the rpc attempt is essentially
 362                  * a noop.  For the case of a V3 write rpc not being
 363                  * committed to stable storage, the block is still
 364                  * dirty and requires either a commit rpc or another
 365                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
 366                  * the block is reused. This is indicated by setting
 367                  * the B_DELWRI and B_NEEDCOMMIT flags.
 368                  */
 369                 if (error == EINTR
 370                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
 371
 372                         crit_enter();
 373                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
 374                         if ((bp->b_flags & B_ASYNC) == 0)
 375                             bp->b_flags |= B_EINTR;
 376                         if ((bp->b_flags & B_PAGING) == 0)
 377                             bdirty(bp);
 378                         if ((bp->b_flags & B_ASYNC) == 0)
 379                             bp->b_flags |= B_EINTR;
 380                         crit_exit();
 381                 } else {
 382                         if (error) {
 383                                 bp->b_flags |= B_ERROR;
 384                                 bp->b_error = error;
 385                         }
 386                         bp->b_dirtyoff = bp->b_dirtyend = 0;
 387                 }
 388             } else {
 389                 bp->b_resid = 0;
 390                 biodone(bio);
 391                 return 0;
 392             }
 393         }
 394         bp->b_resid = uiop->uio_resid;
 395         biodone(bio);
 396         return error;
 397 }
 398
 399 /*
 400  * Vnode op for VM getpages.
 401  * Wish wish .... get rid from multiple IO routines
 402  *
 403  * smbfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
 404  *                int a_reqpage, vm_ooffset_t a_offset)
 405  */
 406 int
 407 smbfs_getpages(struct vop_getpages_args *ap)
 408 {
 409 #ifdef SMBFS_RWGENERIC
 410         return vop_stdgetpages(ap);
 411 #else
 412         int i, error, nextoff, size, toff, npages, count;
 413         int doclose;
 414         struct uio uio;
 415         struct iovec iov;
 416         vm_offset_t kva;
 417         struct buf *bp;
 418         struct vnode *vp;
 419         struct thread *td = curthread;  /* XXX */
 420         struct ucred *cred;
 421         struct smbmount *smp;
 422         struct smbnode *np;
 423         struct smb_cred scred;
 424         vm_page_t *pages;
 425
 426         KKASSERT(td->td_proc);
 427
 428         vp = ap->a_vp;
 429         cred = td->td_proc->p_ucred;
 430         np = VTOSMB(vp);
 431         smp = VFSTOSMBFS(vp->v_mount);
 432         pages = ap->a_m;
 433         count = ap->a_count;
 434
 435         if (vp->v_object == NULL) {
 436                 kprintf("smbfs_getpages: called with non-merged cache vnode??\n");
 437                 return VM_PAGER_ERROR;
 438         }
 439         smb_makescred(&scred, td, cred);
 440
 441         bp = getpbuf(&smbfs_pbuf_freecnt);
 442         npages = btoc(count);
 443         kva = (vm_offset_t) bp->b_data;
 444         pmap_qenter(kva, pages, npages);
 445
 446         iov.iov_base = (caddr_t) kva;
 447         iov.iov_len = count;
 448         uio.uio_iov = &iov;
 449         uio.uio_iovcnt = 1;
 450         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 451         uio.uio_resid = count;
 452         uio.uio_segflg = UIO_SYSSPACE;
 453         uio.uio_rw = UIO_READ;
 454         uio.uio_td = td;
 455
 456         /*
 457          * This is kinda nasty.  Since smbfs is physically closing the
 458          * fid on close(), we have to reopen it if necessary.  There are
 459          * other races here too, such as if another process opens the same
 460          * file while we are blocked in read. XXX
 461          */
 462         error = 0;
 463         doclose = 0;
 464         if (np->n_opencount == 0) {
 465                 error = smbfs_smb_open(np, SMB_AM_OPENREAD, &scred);
 466                 if (error == 0)
 467                         doclose = 1;
 468         }
 469         if (error == 0)
 470                 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
 471         if (doclose)
 472                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 473         pmap_qremove(kva, npages);
 474
 475         relpbuf(bp, &smbfs_pbuf_freecnt);
 476
 477         if (error && (uio.uio_resid == count)) {
 478                 kprintf("smbfs_getpages: error %d\n",error);
 479                 for (i = 0; i < npages; i++) {
 480                         if (ap->a_reqpage != i)
 481                                 vnode_pager_freepage(pages[i]);
 482                 }
 483                 return VM_PAGER_ERROR;
 484         }
 485
 486         size = count - uio.uio_resid;
 487
 488         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
 489                 vm_page_t m;
 490                 nextoff = toff + PAGE_SIZE;
 491                 m = pages[i];
 492
 493                 m->flags &= ~PG_ZERO;
 494
 495                 if (nextoff <= size) {
 496                         m->valid = VM_PAGE_BITS_ALL;
 497                         m->dirty = 0;
 498                 } else {
 499                         int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
 500                         vm_page_set_validclean(m, 0, nvalid);
 501                 }
 502
 503                 if (i != ap->a_reqpage) {
 504                         /*
 505                          * Whether or not to leave the page activated is up in
 506                          * the air, but we should put the page on a page queue
 507                          * somewhere (it already is in the object).  Result:
 508                          * It appears that emperical results show that
 509                          * deactivating pages is best.
 510                          */
 511
 512                         /*
 513                          * Just in case someone was asking for this page we
 514                          * now tell them that it is ok to use.
 515                          */
 516                         if (!error) {
 517                                 if (m->flags & PG_WANTED)
 518                                         vm_page_activate(m);
 519                                 else
 520                                         vm_page_deactivate(m);
 521                                 vm_page_wakeup(m);
 522                         } else {
 523                                 vnode_pager_freepage(m);
 524                         }
 525                 }
 526         }
 527         return 0;
 528 #endif /* SMBFS_RWGENERIC */
 529 }
 530
 531 /*
 532  * Vnode op for VM putpages.
 533  * possible bug: all IO done in sync mode
 534  * Note that vop_close always invalidate pages before close, so it's
 535  * not necessary to open vnode.
 536  *
 537  * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_sync,
 538  *                int *a_rtvals, vm_ooffset_t a_offset)
 539  */
 540 int
 541 smbfs_putpages(struct vop_putpages_args *ap)
 542 {
 543         int error;
 544         struct vnode *vp = ap->a_vp;
 545         struct thread *td = curthread;  /* XXX */
 546         struct ucred *cred;
 547
 548 #ifdef SMBFS_RWGENERIC
 549         KKASSERT(td->td_proc);
 550         cred = td->td_proc->p_ucred;
 551         VOP_OPEN(vp, FWRITE, cred, NULL);
 552         error = vop_stdputpages(ap);
 553         VOP_CLOSE(vp, FWRITE, cred);
 554         return error;
 555 #else
 556         struct uio uio;
 557         struct iovec iov;
 558         vm_offset_t kva;
 559         struct buf *bp;
 560         int i, npages, count;
 561         int doclose;
 562         int *rtvals;
 563         struct smbmount *smp;
 564         struct smbnode *np;
 565         struct smb_cred scred;
 566         vm_page_t *pages;
 567
 568         KKASSERT(td->td_proc);
 569         cred = td->td_proc->p_ucred;
 570 /*      VOP_OPEN(vp, FWRITE, cred, NULL);*/
 571         np = VTOSMB(vp);
 572         smp = VFSTOSMBFS(vp->v_mount);
 573         pages = ap->a_m;
 574         count = ap->a_count;
 575         rtvals = ap->a_rtvals;
 576         npages = btoc(count);
 577
 578         for (i = 0; i < npages; i++) {
 579                 rtvals[i] = VM_PAGER_AGAIN;
 580         }
 581
 582         bp = getpbuf(&smbfs_pbuf_freecnt);
 583         kva = (vm_offset_t) bp->b_data;
 584         pmap_qenter(kva, pages, npages);
 585
 586         iov.iov_base = (caddr_t) kva;
 587         iov.iov_len = count;
 588         uio.uio_iov = &iov;
 589         uio.uio_iovcnt = 1;
 590         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
 591         uio.uio_resid = count;
 592         uio.uio_segflg = UIO_SYSSPACE;
 593         uio.uio_rw = UIO_WRITE;
 594         uio.uio_td = td;
 595         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
 596
 597         smb_makescred(&scred, td, cred);
 598
 599         /*
 600          * This is kinda nasty.  Since smbfs is physically closing the
 601          * fid on close(), we have to reopen it if necessary.  There are
 602          * other races here too, such as if another process opens the same
 603          * file while we are blocked in read, or the file is open read-only
 604          * XXX
 605          */
 606         error = 0;
 607         doclose = 0;
 608         if (np->n_opencount == 0) {
 609                 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
 610                 if (error == 0)
 611                         doclose = 1;
 612         }
 613         if (error == 0)
 614                 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
 615         if (doclose)
 616                 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
 617 /*      VOP_CLOSE(vp, FWRITE, cred);*/
 618         SMBVDEBUG("paged write done: %d\n", error);
 619
 620         pmap_qremove(kva, npages);
 621         relpbuf(bp, &smbfs_pbuf_freecnt);
 622
 623         if (!error) {
 624                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
 625                 for (i = 0; i < nwritten; i++) {
 626                         rtvals[i] = VM_PAGER_OK;
 627                         pages[i]->dirty = 0;
 628                 }
 629         }
 630         return rtvals[0];
 631 #endif /* SMBFS_RWGENERIC */
 632 }
 633
 634 /*
 635  * Flush and invalidate all dirty buffers. If another process is already
 636  * doing the flush, just wait for completion.
 637  */
 638 int
 639 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
 640 {
 641         struct smbnode *np = VTOSMB(vp);
 642         int error = 0, slpflag, slptimeo;
 643
 644         if (vp->v_flag & VRECLAIMED)
 645                 return 0;
 646         if (intrflg) {
 647                 slpflag = PCATCH;
 648                 slptimeo = 2 * hz;
 649         } else {
 650                 slpflag = 0;
 651                 slptimeo = 0;
 652         }
 653         while (np->n_flag & NFLUSHINPROG) {
 654                 np->n_flag |= NFLUSHWANT;
 655                 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo);
 656                 error = smb_proc_intr(curthread);
 657                 if (error == EINTR && intrflg)
 658                         return EINTR;
 659         }
 660         np->n_flag |= NFLUSHINPROG;
 661         error = vinvalbuf(vp, flags, slpflag, 0);
 662         while (error) {
 663                 if (intrflg && (error == ERESTART || error == EINTR)) {
 664                         np->n_flag &= ~NFLUSHINPROG;
 665                         if (np->n_flag & NFLUSHWANT) {
 666                                 np->n_flag &= ~NFLUSHWANT;
 667                                 wakeup((caddr_t)&np->n_flag);
 668                         }
 669                         return EINTR;
 670                 }
 671                 error = vinvalbuf(vp, flags, slpflag, 0);
 672         }
 673         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
 674         if (np->n_flag & NFLUSHWANT) {
 675                 np->n_flag &= ~NFLUSHWANT;
 676                 wakeup((caddr_t)&np->n_flag);
 677         }
 678         return (error);
 679 }