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: releng/12.0/sys/fs/smbfs/smbfs_io.c 341085 2018-11-27 17:58:25Z markj $ 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 int smbfs_pbuf_freecnt; 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 74 #define DE_SIZE (sizeof(struct dirent)) 75 76 static int 77 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 78 { 79 struct dirent de; 80 struct componentname cn; 81 struct smb_cred *scred; 82 struct smbfs_fctx *ctx; 83 struct vnode *newvp; 84 struct smbnode *np = VTOSMB(vp); 85 int error/*, *eofflag = ap->a_eofflag*/; 86 long offset, limit; 87 88 np = VTOSMB(vp); 89 SMBVDEBUG("dirname='%s'\n", np->n_name); 90 scred = smbfs_malloc_scred(); 91 smb_makescred(scred, uio->uio_td, cred); 92 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 93 limit = uio->uio_resid / DE_SIZE; 94 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) { 95 error = EINVAL; 96 goto out; 97 } 98 while (limit && offset < 2) { 99 limit--; 100 bzero((caddr_t)&de, DE_SIZE); 101 de.d_reclen = DE_SIZE; 102 de.d_fileno = (offset == 0) ? np->n_ino : 103 (np->n_parent ? np->n_parentino : 2); 104 if (de.d_fileno == 0) 105 de.d_fileno = 0x7ffffffd + offset; 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_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 157 de.d_namlen = ctx->f_nmlen; 158 bcopy(ctx->f_name, de.d_name, de.d_namlen); 159 dirent_terminate(&de); 160 if (smbfs_fastlookup) { 161 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 162 ctx->f_nmlen, &ctx->f_attr, &newvp); 163 if (!error) { 164 cn.cn_nameptr = de.d_name; 165 cn.cn_namelen = de.d_namlen; 166 cache_enter(vp, newvp, &cn); 167 vput(newvp); 168 } 169 } 170 error = uiomove(&de, DE_SIZE, uio); 171 if (error) 172 break; 173 } 174 if (error == ENOENT) 175 error = 0; 176 uio->uio_offset = offset * DE_SIZE; 177 out: 178 smbfs_free_scred(scred); 179 return error; 180 } 181 182 int 183 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 184 { 185 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 186 struct smbnode *np = VTOSMB(vp); 187 struct thread *td; 188 struct vattr vattr; 189 struct smb_cred *scred; 190 int error, lks; 191 192 /* 193 * Protect against method which is not supported for now 194 */ 195 if (uiop->uio_segflg == UIO_NOCOPY) 196 return EOPNOTSUPP; 197 198 if (vp->v_type != VREG && vp->v_type != VDIR) { 199 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 200 return EIO; 201 } 202 if (uiop->uio_resid == 0) 203 return 0; 204 if (uiop->uio_offset < 0) 205 return EINVAL; 206 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 207 return EFBIG;*/ 208 td = uiop->uio_td; 209 if (vp->v_type == VDIR) { 210 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 211 if (lks == LK_SHARED) 212 vn_lock(vp, LK_UPGRADE | LK_RETRY); 213 error = smbfs_readvdir(vp, uiop, cred); 214 if (lks == LK_SHARED) 215 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 216 return error; 217 } 218 219 /* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 220 if (np->n_flag & NMODIFIED) { 221 smbfs_attr_cacheremove(vp); 222 error = VOP_GETATTR(vp, &vattr, cred); 223 if (error) 224 return error; 225 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 226 } else { 227 error = VOP_GETATTR(vp, &vattr, cred); 228 if (error) 229 return error; 230 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 231 error = smbfs_vinvalbuf(vp, td); 232 if (error) 233 return error; 234 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 235 } 236 } 237 scred = smbfs_malloc_scred(); 238 smb_makescred(scred, td, cred); 239 error = smb_read(smp->sm_share, np->n_fid, uiop, scred); 240 smbfs_free_scred(scred); 241 return (error); 242 } 243 244 int 245 smbfs_writevnode(struct vnode *vp, struct uio *uiop, 246 struct ucred *cred, int ioflag) 247 { 248 struct smbmount *smp = VTOSMBFS(vp); 249 struct smbnode *np = VTOSMB(vp); 250 struct smb_cred *scred; 251 struct thread *td; 252 int error = 0; 253 254 if (vp->v_type != VREG) { 255 SMBERROR("vn types other than VREG unsupported !\n"); 256 return EIO; 257 } 258 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 259 uiop->uio_resid); 260 if (uiop->uio_offset < 0) 261 return EINVAL; 262 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 263 return (EFBIG);*/ 264 td = uiop->uio_td; 265 if (ioflag & (IO_APPEND | IO_SYNC)) { 266 if (np->n_flag & NMODIFIED) { 267 smbfs_attr_cacheremove(vp); 268 error = smbfs_vinvalbuf(vp, td); 269 if (error) 270 return error; 271 } 272 if (ioflag & IO_APPEND) { 273 #ifdef notyet 274 /* 275 * File size can be changed by another client 276 */ 277 smbfs_attr_cacheremove(vp); 278 error = VOP_GETATTR(vp, &vattr, cred); 279 if (error) return (error); 280 #endif 281 uiop->uio_offset = np->n_size; 282 } 283 } 284 if (uiop->uio_resid == 0) 285 return 0; 286 287 if (vn_rlimit_fsize(vp, uiop, td)) 288 return (EFBIG); 289 290 scred = smbfs_malloc_scred(); 291 smb_makescred(scred, td, cred); 292 error = smb_write(smp->sm_share, np->n_fid, uiop, scred); 293 smbfs_free_scred(scred); 294 SMBVDEBUG("after: ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 295 uiop->uio_resid); 296 if (!error) { 297 if (uiop->uio_offset > np->n_size) { 298 np->n_size = uiop->uio_offset; 299 vnode_pager_setsize(vp, np->n_size); 300 } 301 } 302 return error; 303 } 304 305 /* 306 * Do an I/O operation to/from a cache block. 307 */ 308 int 309 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td) 310 { 311 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 312 struct smbnode *np = VTOSMB(vp); 313 struct uio *uiop; 314 struct iovec io; 315 struct smb_cred *scred; 316 int error = 0; 317 318 uiop = malloc(sizeof(struct uio), M_SMBFSDATA, M_WAITOK); 319 uiop->uio_iov = &io; 320 uiop->uio_iovcnt = 1; 321 uiop->uio_segflg = UIO_SYSSPACE; 322 uiop->uio_td = td; 323 324 scred = smbfs_malloc_scred(); 325 smb_makescred(scred, td, cr); 326 327 if (bp->b_iocmd == BIO_READ) { 328 io.iov_len = uiop->uio_resid = bp->b_bcount; 329 io.iov_base = bp->b_data; 330 uiop->uio_rw = UIO_READ; 331 switch (vp->v_type) { 332 case VREG: 333 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 334 error = smb_read(smp->sm_share, np->n_fid, uiop, scred); 335 if (error) 336 break; 337 if (uiop->uio_resid) { 338 int left = uiop->uio_resid; 339 int nread = bp->b_bcount - left; 340 if (left > 0) 341 bzero((char *)bp->b_data + nread, left); 342 } 343 break; 344 default: 345 printf("smbfs_doio: type %x unexpected\n",vp->v_type); 346 break; 347 } 348 if (error) { 349 bp->b_error = error; 350 bp->b_ioflags |= BIO_ERROR; 351 } 352 } else { /* write */ 353 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 354 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 355 356 if (bp->b_dirtyend > bp->b_dirtyoff) { 357 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 358 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 359 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 360 uiop->uio_rw = UIO_WRITE; 361 error = smb_write(smp->sm_share, np->n_fid, uiop, scred); 362 363 /* 364 * For an interrupted write, the buffer is still valid 365 * and the write hasn't been pushed to the server yet, 366 * so we can't set BIO_ERROR and report the interruption 367 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 368 * is not relevant, so the rpc attempt is essentially 369 * a noop. For the case of a V3 write rpc not being 370 * committed to stable storage, the block is still 371 * dirty and requires either a commit rpc or another 372 * write rpc with iomode == NFSV3WRITE_FILESYNC before 373 * the block is reused. This is indicated by setting 374 * the B_DELWRI and B_NEEDCOMMIT flags. 375 */ 376 if (error == EINTR 377 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 378 int s; 379 380 s = splbio(); 381 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 382 if ((bp->b_flags & B_ASYNC) == 0) 383 bp->b_flags |= B_EINTR; 384 if ((bp->b_flags & B_PAGING) == 0) { 385 bdirty(bp); 386 bp->b_flags &= ~B_DONE; 387 } 388 if ((bp->b_flags & B_ASYNC) == 0) 389 bp->b_flags |= B_EINTR; 390 splx(s); 391 } else { 392 if (error) { 393 bp->b_ioflags |= BIO_ERROR; 394 bp->b_error = error; 395 } 396 bp->b_dirtyoff = bp->b_dirtyend = 0; 397 } 398 } else { 399 bp->b_resid = 0; 400 bufdone(bp); 401 free(uiop, M_SMBFSDATA); 402 smbfs_free_scred(scred); 403 return 0; 404 } 405 } 406 bp->b_resid = uiop->uio_resid; 407 bufdone(bp); 408 free(uiop, M_SMBFSDATA); 409 smbfs_free_scred(scred); 410 return error; 411 } 412 413 /* 414 * Vnode op for VM getpages. 415 * Wish wish .... get rid from multiple IO routines 416 */ 417 int 418 smbfs_getpages(ap) 419 struct vop_getpages_args /* { 420 struct vnode *a_vp; 421 vm_page_t *a_m; 422 int a_count; 423 int a_reqpage; 424 } */ *ap; 425 { 426 #ifdef SMBFS_RWGENERIC 427 return vop_stdgetpages(ap); 428 #else 429 int i, error, nextoff, size, toff, npages, count; 430 struct uio uio; 431 struct iovec iov; 432 vm_offset_t kva; 433 struct buf *bp; 434 struct vnode *vp; 435 struct thread *td; 436 struct ucred *cred; 437 struct smbmount *smp; 438 struct smbnode *np; 439 struct smb_cred *scred; 440 vm_object_t object; 441 vm_page_t *pages; 442 443 vp = ap->a_vp; 444 if ((object = vp->v_object) == NULL) { 445 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 446 return VM_PAGER_ERROR; 447 } 448 449 td = curthread; /* XXX */ 450 cred = td->td_ucred; /* XXX */ 451 np = VTOSMB(vp); 452 smp = VFSTOSMBFS(vp->v_mount); 453 pages = ap->a_m; 454 npages = ap->a_count; 455 456 /* 457 * If the requested page is partially valid, just return it and 458 * allow the pager to zero-out the blanks. Partially valid pages 459 * can only occur at the file EOF. 460 * 461 * XXXGL: is that true for SMB filesystem? 462 */ 463 VM_OBJECT_WLOCK(object); 464 if (pages[npages - 1]->valid != 0 && --npages == 0) 465 goto out; 466 VM_OBJECT_WUNLOCK(object); 467 468 scred = smbfs_malloc_scred(); 469 smb_makescred(scred, td, cred); 470 471 bp = getpbuf(&smbfs_pbuf_freecnt); 472 473 kva = (vm_offset_t) bp->b_data; 474 pmap_qenter(kva, pages, npages); 475 VM_CNT_INC(v_vnodein); 476 VM_CNT_ADD(v_vnodepgsin, npages); 477 478 count = npages << PAGE_SHIFT; 479 iov.iov_base = (caddr_t) kva; 480 iov.iov_len = count; 481 uio.uio_iov = &iov; 482 uio.uio_iovcnt = 1; 483 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 484 uio.uio_resid = count; 485 uio.uio_segflg = UIO_SYSSPACE; 486 uio.uio_rw = UIO_READ; 487 uio.uio_td = td; 488 489 error = smb_read(smp->sm_share, np->n_fid, &uio, scred); 490 smbfs_free_scred(scred); 491 pmap_qremove(kva, npages); 492 493 relpbuf(bp, &smbfs_pbuf_freecnt); 494 495 if (error && (uio.uio_resid == count)) { 496 printf("smbfs_getpages: error %d\n",error); 497 return VM_PAGER_ERROR; 498 } 499 500 size = count - uio.uio_resid; 501 502 VM_OBJECT_WLOCK(object); 503 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 504 vm_page_t m; 505 nextoff = toff + PAGE_SIZE; 506 m = pages[i]; 507 508 if (nextoff <= size) { 509 /* 510 * Read operation filled an entire page 511 */ 512 m->valid = VM_PAGE_BITS_ALL; 513 KASSERT(m->dirty == 0, 514 ("smbfs_getpages: page %p is dirty", m)); 515 } else if (size > toff) { 516 /* 517 * Read operation filled a partial page. 518 */ 519 m->valid = 0; 520 vm_page_set_valid_range(m, 0, size - toff); 521 KASSERT(m->dirty == 0, 522 ("smbfs_getpages: page %p is dirty", m)); 523 } else { 524 /* 525 * Read operation was short. If no error occurred 526 * we may have hit a zero-fill section. We simply 527 * leave valid set to 0. 528 */ 529 ; 530 } 531 } 532 out: 533 VM_OBJECT_WUNLOCK(object); 534 if (ap->a_rbehind) 535 *ap->a_rbehind = 0; 536 if (ap->a_rahead) 537 *ap->a_rahead = 0; 538 return (VM_PAGER_OK); 539 #endif /* SMBFS_RWGENERIC */ 540 } 541 542 /* 543 * Vnode op for VM putpages. 544 * possible bug: all IO done in sync mode 545 * Note that vop_close always invalidate pages before close, so it's 546 * not necessary to open vnode. 547 */ 548 int 549 smbfs_putpages(ap) 550 struct vop_putpages_args /* { 551 struct vnode *a_vp; 552 vm_page_t *a_m; 553 int a_count; 554 int a_sync; 555 int *a_rtvals; 556 } */ *ap; 557 { 558 int error; 559 struct vnode *vp = ap->a_vp; 560 struct thread *td; 561 struct ucred *cred; 562 563 #ifdef SMBFS_RWGENERIC 564 td = curthread; /* XXX */ 565 cred = td->td_ucred; /* XXX */ 566 VOP_OPEN(vp, FWRITE, cred, td, NULL); 567 error = vop_stdputpages(ap); 568 VOP_CLOSE(vp, FWRITE, cred, td); 569 return error; 570 #else 571 struct uio uio; 572 struct iovec iov; 573 vm_offset_t kva; 574 struct buf *bp; 575 int i, npages, count; 576 int *rtvals; 577 struct smbmount *smp; 578 struct smbnode *np; 579 struct smb_cred *scred; 580 vm_page_t *pages; 581 582 td = curthread; /* XXX */ 583 cred = td->td_ucred; /* XXX */ 584 /* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 585 np = VTOSMB(vp); 586 smp = VFSTOSMBFS(vp->v_mount); 587 pages = ap->a_m; 588 count = ap->a_count; 589 rtvals = ap->a_rtvals; 590 npages = btoc(count); 591 592 for (i = 0; i < npages; i++) { 593 rtvals[i] = VM_PAGER_ERROR; 594 } 595 596 bp = getpbuf(&smbfs_pbuf_freecnt); 597 598 kva = (vm_offset_t) bp->b_data; 599 pmap_qenter(kva, pages, npages); 600 VM_CNT_INC(v_vnodeout); 601 VM_CNT_ADD(v_vnodepgsout, count); 602 603 iov.iov_base = (caddr_t) kva; 604 iov.iov_len = count; 605 uio.uio_iov = &iov; 606 uio.uio_iovcnt = 1; 607 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 608 uio.uio_resid = count; 609 uio.uio_segflg = UIO_SYSSPACE; 610 uio.uio_rw = UIO_WRITE; 611 uio.uio_td = td; 612 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 613 uio.uio_resid); 614 615 scred = smbfs_malloc_scred(); 616 smb_makescred(scred, td, cred); 617 error = smb_write(smp->sm_share, np->n_fid, &uio, scred); 618 smbfs_free_scred(scred); 619 /* VOP_CLOSE(vp, FWRITE, cred, td);*/ 620 SMBVDEBUG("paged write done: %d\n", error); 621 622 pmap_qremove(kva, npages); 623 624 relpbuf(bp, &smbfs_pbuf_freecnt); 625 626 if (error == 0) { 627 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid, 628 npages * PAGE_SIZE, npages * PAGE_SIZE); 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, struct thread *td) 640 { 641 struct smbnode *np = VTOSMB(vp); 642 int error = 0; 643 644 if (vp->v_iflag & VI_DOOMED) 645 return 0; 646 647 while (np->n_flag & NFLUSHINPROG) { 648 np->n_flag |= NFLUSHWANT; 649 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 650 error = smb_td_intr(td); 651 if (error == EINTR) 652 return EINTR; 653 } 654 np->n_flag |= NFLUSHINPROG; 655 656 if (vp->v_bufobj.bo_object != NULL) { 657 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object); 658 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 659 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object); 660 } 661 662 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 663 while (error) { 664 if (error == ERESTART || error == EINTR) { 665 np->n_flag &= ~NFLUSHINPROG; 666 if (np->n_flag & NFLUSHWANT) { 667 np->n_flag &= ~NFLUSHWANT; 668 wakeup(&np->n_flag); 669 } 670 return EINTR; 671 } 672 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 673 } 674 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 675 if (np->n_flag & NFLUSHWANT) { 676 np->n_flag &= ~NFLUSHWANT; 677 wakeup(&np->n_flag); 678 } 679 return (error); 680 }
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