Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/smbfs/smbfs_io.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2000-2001 Boris Popov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 * 30 */ 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/fcntl.h> 35 #include <sys/bio.h> 36 #include <sys/buf.h> 37 #include <sys/mount.h> 38 #include <sys/namei.h> 39 #include <sys/vnode.h> 40 #include <sys/dirent.h> 41 #include <sys/rwlock.h> 42 #include <sys/signalvar.h> 43 #include <sys/sysctl.h> 44 #include <sys/vmmeter.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_param.h> 48 #include <vm/vm_page.h> 49 #include <vm/vm_extern.h> 50 #include <vm/vm_object.h> 51 #include <vm/vm_pager.h> 52 #include <vm/vnode_pager.h> 53 /* 54 #include <sys/ioccom.h> 55 */ 56 #include <netsmb/smb.h> 57 #include <netsmb/smb_conn.h> 58 #include <netsmb/smb_subr.h> 59 60 #include <fs/smbfs/smbfs.h> 61 #include <fs/smbfs/smbfs_node.h> 62 #include <fs/smbfs/smbfs_subr.h> 63 64 /*#define SMBFS_RWGENERIC*/ 65 66 extern uma_zone_t smbfs_pbuf_zone; 67 68 static int smbfs_fastlookup = 1; 69 70 SYSCTL_DECL(_vfs_smbfs); 71 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 72 73 #define DE_SIZE (sizeof(struct dirent)) 74 75 static int 76 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 77 { 78 struct dirent de; 79 struct componentname cn; 80 struct smb_cred *scred; 81 struct smbfs_fctx *ctx; 82 struct vnode *newvp; 83 struct smbnode *np = VTOSMB(vp); 84 int error/*, *eofflag = ap->a_eofflag*/; 85 long offset, limit; 86 87 np = VTOSMB(vp); 88 SMBVDEBUG("dirname='%s'\n", np->n_name); 89 scred = smbfs_malloc_scred(); 90 smb_makescred(scred, uio->uio_td, cred); 91 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 92 limit = uio->uio_resid / DE_SIZE; 93 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) { 94 error = EINVAL; 95 goto out; 96 } 97 while (limit && offset < 2) { 98 limit--; 99 bzero((caddr_t)&de, DE_SIZE); 100 de.d_reclen = DE_SIZE; 101 de.d_fileno = (offset == 0) ? np->n_ino : 102 (np->n_parent ? np->n_parentino : 2); 103 if (de.d_fileno == 0) 104 de.d_fileno = 0x7ffffffd + offset; 105 de.d_off = offset + 1; 106 de.d_namlen = offset + 1; 107 de.d_name[0] = '.'; 108 de.d_name[1] = '.'; 109 de.d_type = DT_DIR; 110 dirent_terminate(&de); 111 error = uiomove(&de, DE_SIZE, uio); 112 if (error) 113 goto out; 114 offset++; 115 uio->uio_offset += DE_SIZE; 116 } 117 if (limit == 0) { 118 error = 0; 119 goto out; 120 } 121 if (offset != np->n_dirofs || np->n_dirseq == NULL) { 122 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs); 123 if (np->n_dirseq) { 124 smbfs_findclose(np->n_dirseq, scred); 125 np->n_dirseq = NULL; 126 } 127 np->n_dirofs = 2; 128 error = smbfs_findopen(np, "*", 1, 129 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR, 130 scred, &ctx); 131 if (error) { 132 SMBVDEBUG("can not open search, error = %d", error); 133 goto out; 134 } 135 np->n_dirseq = ctx; 136 } else 137 ctx = np->n_dirseq; 138 while (np->n_dirofs < offset) { 139 error = smbfs_findnext(ctx, offset - np->n_dirofs++, scred); 140 if (error) { 141 smbfs_findclose(np->n_dirseq, scred); 142 np->n_dirseq = NULL; 143 error = ENOENT ? 0 : error; 144 goto out; 145 } 146 } 147 error = 0; 148 for (; limit; limit--, offset++) { 149 error = smbfs_findnext(ctx, limit, scred); 150 if (error) 151 break; 152 np->n_dirofs++; 153 bzero((caddr_t)&de, DE_SIZE); 154 de.d_reclen = DE_SIZE; 155 de.d_fileno = ctx->f_attr.fa_ino; 156 de.d_off = offset + 1; 157 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 158 de.d_namlen = ctx->f_nmlen; 159 bcopy(ctx->f_name, de.d_name, de.d_namlen); 160 dirent_terminate(&de); 161 if (smbfs_fastlookup) { 162 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 163 ctx->f_nmlen, &ctx->f_attr, &newvp); 164 if (!error) { 165 cn.cn_nameptr = de.d_name; 166 cn.cn_namelen = de.d_namlen; 167 cache_enter(vp, newvp, &cn); 168 vput(newvp); 169 } 170 } 171 error = uiomove(&de, DE_SIZE, uio); 172 if (error) 173 break; 174 } 175 if (error == ENOENT) 176 error = 0; 177 uio->uio_offset = offset * DE_SIZE; 178 out: 179 smbfs_free_scred(scred); 180 return error; 181 } 182 183 int 184 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 185 { 186 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 187 struct smbnode *np = VTOSMB(vp); 188 struct thread *td; 189 struct vattr vattr; 190 struct smb_cred *scred; 191 int error, lks; 192 193 /* 194 * Protect against method which is not supported for now 195 */ 196 if (uiop->uio_segflg == UIO_NOCOPY) 197 return EOPNOTSUPP; 198 199 if (vp->v_type != VREG && vp->v_type != VDIR) { 200 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 201 return EIO; 202 } 203 if (uiop->uio_resid == 0) 204 return 0; 205 if (uiop->uio_offset < 0) 206 return EINVAL; 207 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 208 return EFBIG;*/ 209 td = uiop->uio_td; 210 if (vp->v_type == VDIR) { 211 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 212 if (lks == LK_SHARED) 213 vn_lock(vp, LK_UPGRADE | LK_RETRY); 214 error = smbfs_readvdir(vp, uiop, cred); 215 if (lks == LK_SHARED) 216 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 217 return error; 218 } 219 220 /* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 221 if (np->n_flag & NMODIFIED) { 222 smbfs_attr_cacheremove(vp); 223 error = VOP_GETATTR(vp, &vattr, cred); 224 if (error) 225 return error; 226 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 227 } else { 228 error = VOP_GETATTR(vp, &vattr, cred); 229 if (error) 230 return error; 231 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 232 error = smbfs_vinvalbuf(vp, td); 233 if (error) 234 return error; 235 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 236 } 237 } 238 scred = smbfs_malloc_scred(); 239 smb_makescred(scred, td, cred); 240 error = smb_read(smp->sm_share, np->n_fid, uiop, scred); 241 smbfs_free_scred(scred); 242 return (error); 243 } 244 245 int 246 smbfs_writevnode(struct vnode *vp, struct uio *uiop, 247 struct ucred *cred, int ioflag) 248 { 249 struct smbmount *smp = VTOSMBFS(vp); 250 struct smbnode *np = VTOSMB(vp); 251 struct smb_cred *scred; 252 struct thread *td; 253 int error = 0; 254 255 if (vp->v_type != VREG) { 256 SMBERROR("vn types other than VREG unsupported !\n"); 257 return EIO; 258 } 259 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 260 uiop->uio_resid); 261 if (uiop->uio_offset < 0) 262 return EINVAL; 263 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 264 return (EFBIG);*/ 265 td = uiop->uio_td; 266 if (ioflag & (IO_APPEND | IO_SYNC)) { 267 if (np->n_flag & NMODIFIED) { 268 smbfs_attr_cacheremove(vp); 269 error = smbfs_vinvalbuf(vp, td); 270 if (error) 271 return error; 272 } 273 if (ioflag & IO_APPEND) { 274 #ifdef notyet 275 /* 276 * File size can be changed by another client 277 */ 278 smbfs_attr_cacheremove(vp); 279 error = VOP_GETATTR(vp, &vattr, cred); 280 if (error) return (error); 281 #endif 282 uiop->uio_offset = np->n_size; 283 } 284 } 285 if (uiop->uio_resid == 0) 286 return 0; 287 288 if (vn_rlimit_fsize(vp, uiop, td)) 289 return (EFBIG); 290 291 scred = smbfs_malloc_scred(); 292 smb_makescred(scred, td, cred); 293 error = smb_write(smp->sm_share, np->n_fid, uiop, scred); 294 smbfs_free_scred(scred); 295 SMBVDEBUG("after: ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 296 uiop->uio_resid); 297 if (!error) { 298 if (uiop->uio_offset > np->n_size) { 299 np->n_size = uiop->uio_offset; 300 vnode_pager_setsize(vp, np->n_size); 301 } 302 } 303 return error; 304 } 305 306 /* 307 * Do an I/O operation to/from a cache block. 308 */ 309 int 310 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td) 311 { 312 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 313 struct smbnode *np = VTOSMB(vp); 314 struct uio *uiop; 315 struct iovec io; 316 struct smb_cred *scred; 317 int error = 0; 318 319 uiop = malloc(sizeof(struct uio), M_SMBFSDATA, M_WAITOK); 320 uiop->uio_iov = &io; 321 uiop->uio_iovcnt = 1; 322 uiop->uio_segflg = UIO_SYSSPACE; 323 uiop->uio_td = td; 324 325 scred = smbfs_malloc_scred(); 326 smb_makescred(scred, td, cr); 327 328 if (bp->b_iocmd == BIO_READ) { 329 io.iov_len = uiop->uio_resid = bp->b_bcount; 330 io.iov_base = bp->b_data; 331 uiop->uio_rw = UIO_READ; 332 switch (vp->v_type) { 333 case VREG: 334 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 335 error = smb_read(smp->sm_share, np->n_fid, uiop, scred); 336 if (error) 337 break; 338 if (uiop->uio_resid) { 339 int left = uiop->uio_resid; 340 int nread = bp->b_bcount - left; 341 if (left > 0) 342 bzero((char *)bp->b_data + nread, left); 343 } 344 break; 345 default: 346 printf("smbfs_doio: type %x unexpected\n",vp->v_type); 347 break; 348 } 349 if (error) { 350 bp->b_error = error; 351 bp->b_ioflags |= BIO_ERROR; 352 } 353 } else { /* write */ 354 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 355 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 356 357 if (bp->b_dirtyend > bp->b_dirtyoff) { 358 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 359 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 360 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 361 uiop->uio_rw = UIO_WRITE; 362 error = smb_write(smp->sm_share, np->n_fid, uiop, scred); 363 364 /* 365 * For an interrupted write, the buffer is still valid 366 * and the write hasn't been pushed to the server yet, 367 * so we can't set BIO_ERROR and report the interruption 368 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 369 * is not relevant, so the rpc attempt is essentially 370 * a noop. For the case of a V3 write rpc not being 371 * committed to stable storage, the block is still 372 * dirty and requires either a commit rpc or another 373 * write rpc with iomode == NFSV3WRITE_FILESYNC before 374 * the block is reused. This is indicated by setting 375 * the B_DELWRI and B_NEEDCOMMIT flags. 376 */ 377 if (error == EINTR 378 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 379 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 380 if ((bp->b_flags & B_ASYNC) == 0) 381 bp->b_flags |= B_EINTR; 382 if ((bp->b_flags & B_PAGING) == 0) { 383 bdirty(bp); 384 bp->b_flags &= ~B_DONE; 385 } 386 if ((bp->b_flags & B_ASYNC) == 0) 387 bp->b_flags |= B_EINTR; 388 } else { 389 if (error) { 390 bp->b_ioflags |= BIO_ERROR; 391 bp->b_error = error; 392 } 393 bp->b_dirtyoff = bp->b_dirtyend = 0; 394 } 395 } else { 396 bp->b_resid = 0; 397 bufdone(bp); 398 free(uiop, M_SMBFSDATA); 399 smbfs_free_scred(scred); 400 return 0; 401 } 402 } 403 bp->b_resid = uiop->uio_resid; 404 bufdone(bp); 405 free(uiop, M_SMBFSDATA); 406 smbfs_free_scred(scred); 407 return error; 408 } 409 410 /* 411 * Vnode op for VM getpages. 412 * Wish wish .... get rid from multiple IO routines 413 */ 414 int 415 smbfs_getpages(ap) 416 struct vop_getpages_args /* { 417 struct vnode *a_vp; 418 vm_page_t *a_m; 419 int a_count; 420 int a_reqpage; 421 } */ *ap; 422 { 423 #ifdef SMBFS_RWGENERIC 424 return vop_stdgetpages(ap); 425 #else 426 int i, error, nextoff, size, toff, npages, count; 427 struct uio uio; 428 struct iovec iov; 429 vm_offset_t kva; 430 struct buf *bp; 431 struct vnode *vp; 432 struct thread *td; 433 struct ucred *cred; 434 struct smbmount *smp; 435 struct smbnode *np; 436 struct smb_cred *scred; 437 vm_object_t object; 438 vm_page_t *pages; 439 440 vp = ap->a_vp; 441 if ((object = vp->v_object) == NULL) { 442 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 443 return VM_PAGER_ERROR; 444 } 445 446 td = curthread; /* XXX */ 447 cred = td->td_ucred; /* XXX */ 448 np = VTOSMB(vp); 449 smp = VFSTOSMBFS(vp->v_mount); 450 pages = ap->a_m; 451 npages = ap->a_count; 452 453 /* 454 * If the requested page is partially valid, just return it and 455 * allow the pager to zero-out the blanks. Partially valid pages 456 * can only occur at the file EOF. 457 * 458 * XXXGL: is that true for SMB filesystem? 459 */ 460 VM_OBJECT_WLOCK(object); 461 if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0) 462 goto out; 463 VM_OBJECT_WUNLOCK(object); 464 465 scred = smbfs_malloc_scred(); 466 smb_makescred(scred, td, cred); 467 468 bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK); 469 470 kva = (vm_offset_t) bp->b_data; 471 pmap_qenter(kva, pages, npages); 472 VM_CNT_INC(v_vnodein); 473 VM_CNT_ADD(v_vnodepgsin, npages); 474 475 count = npages << PAGE_SHIFT; 476 iov.iov_base = (caddr_t) kva; 477 iov.iov_len = count; 478 uio.uio_iov = &iov; 479 uio.uio_iovcnt = 1; 480 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 481 uio.uio_resid = count; 482 uio.uio_segflg = UIO_SYSSPACE; 483 uio.uio_rw = UIO_READ; 484 uio.uio_td = td; 485 486 error = smb_read(smp->sm_share, np->n_fid, &uio, scred); 487 smbfs_free_scred(scred); 488 pmap_qremove(kva, npages); 489 490 uma_zfree(smbfs_pbuf_zone, bp); 491 492 if (error && (uio.uio_resid == count)) { 493 printf("smbfs_getpages: error %d\n",error); 494 return VM_PAGER_ERROR; 495 } 496 497 size = count - uio.uio_resid; 498 499 VM_OBJECT_WLOCK(object); 500 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 501 vm_page_t m; 502 nextoff = toff + PAGE_SIZE; 503 m = pages[i]; 504 505 if (nextoff <= size) { 506 /* 507 * Read operation filled an entire page 508 */ 509 vm_page_valid(m); 510 KASSERT(m->dirty == 0, 511 ("smbfs_getpages: page %p is dirty", m)); 512 } else if (size > toff) { 513 /* 514 * Read operation filled a partial page. 515 */ 516 vm_page_invalid(m); 517 vm_page_set_valid_range(m, 0, size - toff); 518 KASSERT(m->dirty == 0, 519 ("smbfs_getpages: page %p is dirty", m)); 520 } else { 521 /* 522 * Read operation was short. If no error occurred 523 * we may have hit a zero-fill section. We simply 524 * leave valid set to 0. 525 */ 526 ; 527 } 528 } 529 out: 530 VM_OBJECT_WUNLOCK(object); 531 if (ap->a_rbehind) 532 *ap->a_rbehind = 0; 533 if (ap->a_rahead) 534 *ap->a_rahead = 0; 535 return (VM_PAGER_OK); 536 #endif /* SMBFS_RWGENERIC */ 537 } 538 539 /* 540 * Vnode op for VM putpages. 541 * possible bug: all IO done in sync mode 542 * Note that vop_close always invalidate pages before close, so it's 543 * not necessary to open vnode. 544 */ 545 int 546 smbfs_putpages(ap) 547 struct vop_putpages_args /* { 548 struct vnode *a_vp; 549 vm_page_t *a_m; 550 int a_count; 551 int a_sync; 552 int *a_rtvals; 553 } */ *ap; 554 { 555 int error; 556 struct vnode *vp = ap->a_vp; 557 struct thread *td; 558 struct ucred *cred; 559 560 #ifdef SMBFS_RWGENERIC 561 td = curthread; /* XXX */ 562 cred = td->td_ucred; /* XXX */ 563 VOP_OPEN(vp, FWRITE, cred, td, NULL); 564 error = vop_stdputpages(ap); 565 VOP_CLOSE(vp, FWRITE, cred, td); 566 return error; 567 #else 568 struct uio uio; 569 struct iovec iov; 570 vm_offset_t kva; 571 struct buf *bp; 572 int i, npages, count; 573 int *rtvals; 574 struct smbmount *smp; 575 struct smbnode *np; 576 struct smb_cred *scred; 577 vm_page_t *pages; 578 579 td = curthread; /* XXX */ 580 cred = td->td_ucred; /* XXX */ 581 /* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 582 np = VTOSMB(vp); 583 smp = VFSTOSMBFS(vp->v_mount); 584 pages = ap->a_m; 585 count = ap->a_count; 586 rtvals = ap->a_rtvals; 587 npages = btoc(count); 588 589 for (i = 0; i < npages; i++) { 590 rtvals[i] = VM_PAGER_ERROR; 591 } 592 593 bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK); 594 595 kva = (vm_offset_t) bp->b_data; 596 pmap_qenter(kva, pages, npages); 597 VM_CNT_INC(v_vnodeout); 598 VM_CNT_ADD(v_vnodepgsout, count); 599 600 iov.iov_base = (caddr_t) kva; 601 iov.iov_len = count; 602 uio.uio_iov = &iov; 603 uio.uio_iovcnt = 1; 604 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 605 uio.uio_resid = count; 606 uio.uio_segflg = UIO_SYSSPACE; 607 uio.uio_rw = UIO_WRITE; 608 uio.uio_td = td; 609 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 610 uio.uio_resid); 611 612 scred = smbfs_malloc_scred(); 613 smb_makescred(scred, td, cred); 614 error = smb_write(smp->sm_share, np->n_fid, &uio, scred); 615 smbfs_free_scred(scred); 616 /* VOP_CLOSE(vp, FWRITE, cred, td);*/ 617 SMBVDEBUG("paged write done: %d\n", error); 618 619 pmap_qremove(kva, npages); 620 621 uma_zfree(smbfs_pbuf_zone, bp); 622 623 if (error == 0) { 624 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid, 625 npages * PAGE_SIZE, npages * PAGE_SIZE); 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, struct thread *td) 637 { 638 struct smbnode *np = VTOSMB(vp); 639 int error = 0; 640 641 if (VN_IS_DOOMED(vp)) 642 return 0; 643 644 while (np->n_flag & NFLUSHINPROG) { 645 np->n_flag |= NFLUSHWANT; 646 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 647 error = smb_td_intr(td); 648 if (error == EINTR) 649 return EINTR; 650 } 651 np->n_flag |= NFLUSHINPROG; 652 653 if (vp->v_bufobj.bo_object != NULL) { 654 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object); 655 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 656 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object); 657 } 658 659 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 660 while (error) { 661 if (error == ERESTART || error == EINTR) { 662 np->n_flag &= ~NFLUSHINPROG; 663 if (np->n_flag & NFLUSHWANT) { 664 np->n_flag &= ~NFLUSHWANT; 665 wakeup(&np->n_flag); 666 } 667 return EINTR; 668 } 669 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 670 } 671 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 672 if (np->n_flag & NFLUSHWANT) { 673 np->n_flag &= ~NFLUSHWANT; 674 wakeup(&np->n_flag); 675 } 676 return (error); 677 }
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