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 * 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: releng/8.4/sys/fs/smbfs/smbfs_io.c 225320 2011-09-02 07:37:55Z mm $ 33 * 34 */ 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/fcntl.h> 39 #include <sys/bio.h> 40 #include <sys/buf.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/vnode.h> 44 #include <sys/dirent.h> 45 #include <sys/signalvar.h> 46 #include <sys/sysctl.h> 47 #include <sys/vmmeter.h> 48 49 #include <vm/vm.h> 50 #include <vm/vm_page.h> 51 #include <vm/vm_extern.h> 52 #include <vm/vm_object.h> 53 #include <vm/vm_pager.h> 54 #include <vm/vnode_pager.h> 55 /* 56 #include <sys/ioccom.h> 57 */ 58 #include <netsmb/smb.h> 59 #include <netsmb/smb_conn.h> 60 #include <netsmb/smb_subr.h> 61 62 #include <fs/smbfs/smbfs.h> 63 #include <fs/smbfs/smbfs_node.h> 64 #include <fs/smbfs/smbfs_subr.h> 65 66 /*#define SMBFS_RWGENERIC*/ 67 68 extern int smbfs_pbuf_freecnt; 69 70 static int smbfs_fastlookup = 1; 71 72 SYSCTL_DECL(_vfs_smbfs); 73 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 74 75 76 #define DE_SIZE (sizeof(struct dirent)) 77 78 static int 79 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 80 { 81 struct dirent de; 82 struct componentname cn; 83 struct smb_cred scred; 84 struct smbfs_fctx *ctx; 85 struct vnode *newvp; 86 struct smbnode *np = VTOSMB(vp); 87 int error/*, *eofflag = ap->a_eofflag*/; 88 long offset, limit; 89 90 np = VTOSMB(vp); 91 SMBVDEBUG("dirname='%s'\n", np->n_name); 92 smb_makescred(&scred, uio->uio_td, cred); 93 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 94 limit = uio->uio_resid / DE_SIZE; 95 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) 96 return EINVAL; 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 ? VTOSMB(np->n_parent)->n_ino : 2); 103 if (de.d_fileno == 0) 104 de.d_fileno = 0x7ffffffd + offset; 105 de.d_namlen = offset + 1; 106 de.d_name[0] = '.'; 107 de.d_name[1] = '.'; 108 de.d_name[offset + 1] = '\0'; 109 de.d_type = DT_DIR; 110 error = uiomove(&de, DE_SIZE, uio); 111 if (error) 112 return error; 113 offset++; 114 uio->uio_offset += DE_SIZE; 115 } 116 if (limit == 0) 117 return 0; 118 if (offset != np->n_dirofs || np->n_dirseq == NULL) { 119 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs); 120 if (np->n_dirseq) { 121 smbfs_findclose(np->n_dirseq, &scred); 122 np->n_dirseq = NULL; 123 } 124 np->n_dirofs = 2; 125 error = smbfs_findopen(np, "*", 1, 126 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR, 127 &scred, &ctx); 128 if (error) { 129 SMBVDEBUG("can not open search, error = %d", error); 130 return error; 131 } 132 np->n_dirseq = ctx; 133 } else 134 ctx = np->n_dirseq; 135 while (np->n_dirofs < offset) { 136 error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred); 137 if (error) { 138 smbfs_findclose(np->n_dirseq, &scred); 139 np->n_dirseq = NULL; 140 return error == ENOENT ? 0 : error; 141 } 142 } 143 error = 0; 144 for (; limit; limit--, offset++) { 145 error = smbfs_findnext(ctx, limit, &scred); 146 if (error) 147 break; 148 np->n_dirofs++; 149 bzero((caddr_t)&de, DE_SIZE); 150 de.d_reclen = DE_SIZE; 151 de.d_fileno = ctx->f_attr.fa_ino; 152 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 153 de.d_namlen = ctx->f_nmlen; 154 bcopy(ctx->f_name, de.d_name, de.d_namlen); 155 de.d_name[de.d_namlen] = '\0'; 156 if (smbfs_fastlookup) { 157 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 158 ctx->f_nmlen, &ctx->f_attr, &newvp); 159 if (!error) { 160 cn.cn_nameptr = de.d_name; 161 cn.cn_namelen = de.d_namlen; 162 cache_enter(vp, newvp, &cn); 163 vput(newvp); 164 } 165 } 166 error = uiomove(&de, DE_SIZE, uio); 167 if (error) 168 break; 169 } 170 if (error == ENOENT) 171 error = 0; 172 uio->uio_offset = offset * DE_SIZE; 173 return error; 174 } 175 176 int 177 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 178 { 179 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 180 struct smbnode *np = VTOSMB(vp); 181 struct thread *td; 182 struct vattr vattr; 183 struct smb_cred scred; 184 int error, lks; 185 186 /* 187 * Protect against method which is not supported for now 188 */ 189 if (uiop->uio_segflg == UIO_NOCOPY) 190 return EOPNOTSUPP; 191 192 if (vp->v_type != VREG && vp->v_type != VDIR) { 193 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 194 return EIO; 195 } 196 if (uiop->uio_resid == 0) 197 return 0; 198 if (uiop->uio_offset < 0) 199 return EINVAL; 200 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 201 return EFBIG;*/ 202 td = uiop->uio_td; 203 if (vp->v_type == VDIR) { 204 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 205 if (lks == LK_SHARED) 206 vn_lock(vp, LK_UPGRADE | LK_RETRY); 207 error = smbfs_readvdir(vp, uiop, cred); 208 if (lks == LK_SHARED) 209 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 210 return error; 211 } 212 213 /* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 214 if (np->n_flag & NMODIFIED) { 215 smbfs_attr_cacheremove(vp); 216 error = VOP_GETATTR(vp, &vattr, cred); 217 if (error) 218 return error; 219 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 220 } else { 221 error = VOP_GETATTR(vp, &vattr, cred); 222 if (error) 223 return error; 224 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 225 error = smbfs_vinvalbuf(vp, td); 226 if (error) 227 return error; 228 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 229 } 230 } 231 smb_makescred(&scred, td, cred); 232 return smb_read(smp->sm_share, np->n_fid, uiop, &scred); 233 } 234 235 int 236 smbfs_writevnode(struct vnode *vp, struct uio *uiop, 237 struct ucred *cred, int ioflag) 238 { 239 struct smbmount *smp = VTOSMBFS(vp); 240 struct smbnode *np = VTOSMB(vp); 241 struct smb_cred scred; 242 struct thread *td; 243 int error = 0; 244 245 if (vp->v_type != VREG) { 246 SMBERROR("vn types other than VREG unsupported !\n"); 247 return EIO; 248 } 249 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 250 if (uiop->uio_offset < 0) 251 return EINVAL; 252 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 253 return (EFBIG);*/ 254 td = uiop->uio_td; 255 if (ioflag & (IO_APPEND | IO_SYNC)) { 256 if (np->n_flag & NMODIFIED) { 257 smbfs_attr_cacheremove(vp); 258 error = smbfs_vinvalbuf(vp, td); 259 if (error) 260 return error; 261 } 262 if (ioflag & IO_APPEND) { 263 #ifdef notyet 264 /* 265 * File size can be changed by another client 266 */ 267 smbfs_attr_cacheremove(vp); 268 error = VOP_GETATTR(vp, &vattr, cred); 269 if (error) return (error); 270 #endif 271 uiop->uio_offset = np->n_size; 272 } 273 } 274 if (uiop->uio_resid == 0) 275 return 0; 276 277 if (vn_rlimit_fsize(vp, uiop, td)) 278 return (EFBIG); 279 280 smb_makescred(&scred, td, cred); 281 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 282 SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 283 if (!error) { 284 if (uiop->uio_offset > np->n_size) { 285 np->n_size = uiop->uio_offset; 286 vnode_pager_setsize(vp, np->n_size); 287 } 288 } 289 return error; 290 } 291 292 /* 293 * Do an I/O operation to/from a cache block. 294 */ 295 int 296 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td) 297 { 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_iocmd == BIO_READ) { 313 io.iov_len = uiop->uio_resid = 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 = ((off_t)bp->b_blkno) * DEV_BSIZE; 319 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred); 320 if (error) 321 break; 322 if (uiop->uio_resid) { 323 int left = uiop->uio_resid; 324 int nread = bp->b_bcount - left; 325 if (left > 0) 326 bzero((char *)bp->b_data + nread, left); 327 } 328 break; 329 default: 330 printf("smbfs_doio: type %x unexpected\n",vp->v_type); 331 break; 332 }; 333 if (error) { 334 bp->b_error = error; 335 bp->b_ioflags |= BIO_ERROR; 336 } 337 } else { /* write */ 338 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 339 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 340 341 if (bp->b_dirtyend > bp->b_dirtyoff) { 342 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 343 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 344 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 345 uiop->uio_rw = UIO_WRITE; 346 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 347 348 /* 349 * For an interrupted write, the buffer is still valid 350 * and the write hasn't been pushed to the server yet, 351 * so we can't set BIO_ERROR and report the interruption 352 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 353 * is not relevant, so the rpc attempt is essentially 354 * a noop. For the case of a V3 write rpc not being 355 * committed to stable storage, the block is still 356 * dirty and requires either a commit rpc or another 357 * write rpc with iomode == NFSV3WRITE_FILESYNC before 358 * the block is reused. This is indicated by setting 359 * the B_DELWRI and B_NEEDCOMMIT flags. 360 */ 361 if (error == EINTR 362 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 363 int s; 364 365 s = splbio(); 366 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 367 if ((bp->b_flags & B_ASYNC) == 0) 368 bp->b_flags |= B_EINTR; 369 if ((bp->b_flags & B_PAGING) == 0) { 370 bdirty(bp); 371 bp->b_flags &= ~B_DONE; 372 } 373 if ((bp->b_flags & B_ASYNC) == 0) 374 bp->b_flags |= B_EINTR; 375 splx(s); 376 } else { 377 if (error) { 378 bp->b_ioflags |= BIO_ERROR; 379 bp->b_error = error; 380 } 381 bp->b_dirtyoff = bp->b_dirtyend = 0; 382 } 383 } else { 384 bp->b_resid = 0; 385 bufdone(bp); 386 return 0; 387 } 388 } 389 bp->b_resid = uiop->uio_resid; 390 bufdone(bp); 391 return error; 392 } 393 394 /* 395 * Vnode op for VM getpages. 396 * Wish wish .... get rid from multiple IO routines 397 */ 398 int 399 smbfs_getpages(ap) 400 struct vop_getpages_args /* { 401 struct vnode *a_vp; 402 vm_page_t *a_m; 403 int a_count; 404 int a_reqpage; 405 vm_ooffset_t a_offset; 406 } */ *ap; 407 { 408 #ifdef SMBFS_RWGENERIC 409 return vop_stdgetpages(ap); 410 #else 411 int i, error, nextoff, size, toff, npages, count, reqpage; 412 struct uio uio; 413 struct iovec iov; 414 vm_offset_t kva; 415 struct buf *bp; 416 struct vnode *vp; 417 struct thread *td; 418 struct ucred *cred; 419 struct smbmount *smp; 420 struct smbnode *np; 421 struct smb_cred scred; 422 vm_object_t object; 423 vm_page_t *pages, m; 424 425 vp = ap->a_vp; 426 if ((object = vp->v_object) == NULL) { 427 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 428 return VM_PAGER_ERROR; 429 } 430 431 td = curthread; /* XXX */ 432 cred = td->td_ucred; /* XXX */ 433 np = VTOSMB(vp); 434 smp = VFSTOSMBFS(vp->v_mount); 435 pages = ap->a_m; 436 count = ap->a_count; 437 npages = btoc(count); 438 reqpage = ap->a_reqpage; 439 440 /* 441 * If the requested page is partially valid, just return it and 442 * allow the pager to zero-out the blanks. Partially valid pages 443 * can only occur at the file EOF. 444 */ 445 m = pages[reqpage]; 446 447 VM_OBJECT_LOCK(object); 448 if (m->valid != 0) { 449 vm_page_lock_queues(); 450 for (i = 0; i < npages; ++i) { 451 if (i != reqpage) 452 vm_page_free(pages[i]); 453 } 454 vm_page_unlock_queues(); 455 VM_OBJECT_UNLOCK(object); 456 return 0; 457 } 458 VM_OBJECT_UNLOCK(object); 459 460 smb_makescred(&scred, td, cred); 461 462 bp = getpbuf(&smbfs_pbuf_freecnt); 463 464 kva = (vm_offset_t) bp->b_data; 465 pmap_qenter(kva, pages, npages); 466 PCPU_INC(cnt.v_vnodein); 467 PCPU_ADD(cnt.v_vnodepgsin, npages); 468 469 iov.iov_base = (caddr_t) kva; 470 iov.iov_len = count; 471 uio.uio_iov = &iov; 472 uio.uio_iovcnt = 1; 473 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 474 uio.uio_resid = count; 475 uio.uio_segflg = UIO_SYSSPACE; 476 uio.uio_rw = UIO_READ; 477 uio.uio_td = td; 478 479 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred); 480 pmap_qremove(kva, npages); 481 482 relpbuf(bp, &smbfs_pbuf_freecnt); 483 484 VM_OBJECT_LOCK(object); 485 if (error && (uio.uio_resid == count)) { 486 printf("smbfs_getpages: error %d\n",error); 487 vm_page_lock_queues(); 488 for (i = 0; i < npages; i++) { 489 if (reqpage != i) 490 vm_page_free(pages[i]); 491 } 492 vm_page_unlock_queues(); 493 VM_OBJECT_UNLOCK(object); 494 return VM_PAGER_ERROR; 495 } 496 497 size = count - uio.uio_resid; 498 499 vm_page_lock_queues(); 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 m->valid = VM_PAGE_BITS_ALL; 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 m->valid = 0; 517 vm_page_set_valid(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 occured 523 * we may have hit a zero-fill section. We simply 524 * leave valid set to 0. 525 */ 526 ; 527 } 528 529 if (i != reqpage) { 530 /* 531 * Whether or not to leave the page activated is up in 532 * the air, but we should put the page on a page queue 533 * somewhere (it already is in the object). Result: 534 * It appears that emperical results show that 535 * deactivating pages is best. 536 */ 537 538 /* 539 * Just in case someone was asking for this page we 540 * now tell them that it is ok to use. 541 */ 542 if (!error) { 543 if (m->oflags & VPO_WANTED) 544 vm_page_activate(m); 545 else 546 vm_page_deactivate(m); 547 vm_page_wakeup(m); 548 } else { 549 vm_page_free(m); 550 } 551 } 552 } 553 vm_page_unlock_queues(); 554 VM_OBJECT_UNLOCK(object); 555 return 0; 556 #endif /* SMBFS_RWGENERIC */ 557 } 558 559 /* 560 * Vnode op for VM putpages. 561 * possible bug: all IO done in sync mode 562 * Note that vop_close always invalidate pages before close, so it's 563 * not necessary to open vnode. 564 */ 565 int 566 smbfs_putpages(ap) 567 struct vop_putpages_args /* { 568 struct vnode *a_vp; 569 vm_page_t *a_m; 570 int a_count; 571 int a_sync; 572 int *a_rtvals; 573 vm_ooffset_t a_offset; 574 } */ *ap; 575 { 576 int error; 577 struct vnode *vp = ap->a_vp; 578 struct thread *td; 579 struct ucred *cred; 580 581 #ifdef SMBFS_RWGENERIC 582 td = curthread; /* XXX */ 583 cred = td->td_ucred; /* XXX */ 584 VOP_OPEN(vp, FWRITE, cred, td, NULL); 585 error = vop_stdputpages(ap); 586 VOP_CLOSE(vp, FWRITE, cred, td); 587 return error; 588 #else 589 struct uio uio; 590 struct iovec iov; 591 vm_offset_t kva; 592 struct buf *bp; 593 int i, npages, count; 594 int *rtvals; 595 struct smbmount *smp; 596 struct smbnode *np; 597 struct smb_cred scred; 598 vm_page_t *pages; 599 600 td = curthread; /* XXX */ 601 cred = td->td_ucred; /* XXX */ 602 /* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 603 np = VTOSMB(vp); 604 smp = VFSTOSMBFS(vp->v_mount); 605 pages = ap->a_m; 606 count = ap->a_count; 607 rtvals = ap->a_rtvals; 608 npages = btoc(count); 609 610 for (i = 0; i < npages; i++) { 611 rtvals[i] = VM_PAGER_ERROR; 612 } 613 614 bp = getpbuf(&smbfs_pbuf_freecnt); 615 616 kva = (vm_offset_t) bp->b_data; 617 pmap_qenter(kva, pages, npages); 618 PCPU_INC(cnt.v_vnodeout); 619 PCPU_ADD(cnt.v_vnodepgsout, count); 620 621 iov.iov_base = (caddr_t) kva; 622 iov.iov_len = count; 623 uio.uio_iov = &iov; 624 uio.uio_iovcnt = 1; 625 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 626 uio.uio_resid = count; 627 uio.uio_segflg = UIO_SYSSPACE; 628 uio.uio_rw = UIO_WRITE; 629 uio.uio_td = td; 630 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 631 632 smb_makescred(&scred, td, cred); 633 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred); 634 /* VOP_CLOSE(vp, FWRITE, cred, td);*/ 635 SMBVDEBUG("paged write done: %d\n", error); 636 637 pmap_qremove(kva, npages); 638 639 relpbuf(bp, &smbfs_pbuf_freecnt); 640 641 if (!error) 642 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid); 643 return rtvals[0]; 644 #endif /* SMBFS_RWGENERIC */ 645 } 646 647 /* 648 * Flush and invalidate all dirty buffers. If another process is already 649 * doing the flush, just wait for completion. 650 */ 651 int 652 smbfs_vinvalbuf(struct vnode *vp, struct thread *td) 653 { 654 struct smbnode *np = VTOSMB(vp); 655 int error = 0; 656 657 if (vp->v_iflag & VI_DOOMED) 658 return 0; 659 660 while (np->n_flag & NFLUSHINPROG) { 661 np->n_flag |= NFLUSHWANT; 662 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 663 error = smb_td_intr(td); 664 if (error == EINTR) 665 return EINTR; 666 } 667 np->n_flag |= NFLUSHINPROG; 668 669 if (vp->v_bufobj.bo_object != NULL) { 670 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 671 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 672 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 673 } 674 675 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 676 while (error) { 677 if (error == ERESTART || error == EINTR) { 678 np->n_flag &= ~NFLUSHINPROG; 679 if (np->n_flag & NFLUSHWANT) { 680 np->n_flag &= ~NFLUSHWANT; 681 wakeup(&np->n_flag); 682 } 683 return EINTR; 684 } 685 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 686 } 687 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 688 if (np->n_flag & NFLUSHWANT) { 689 np->n_flag &= ~NFLUSHWANT; 690 wakeup(&np->n_flag); 691 } 692 return (error); 693 }
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