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