smbfs_io.c revision 207746
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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/fs/smbfs/smbfs_io.c 207746 2010-05-07 15:49:43Z alc $ 27 * 28 */ 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/kernel.h> 32#include <sys/fcntl.h> 33#include <sys/bio.h> 34#include <sys/buf.h> 35#include <sys/mount.h> 36#include <sys/namei.h> 37#include <sys/vnode.h> 38#include <sys/dirent.h> 39#include <sys/signalvar.h> 40#include <sys/sysctl.h> 41#include <sys/vmmeter.h> 42 43#include <vm/vm.h> 44#include <vm/vm_page.h> 45#include <vm/vm_extern.h> 46#include <vm/vm_object.h> 47#include <vm/vm_pager.h> 48#include <vm/vnode_pager.h> 49/* 50#include <sys/ioccom.h> 51*/ 52#include <netsmb/smb.h> 53#include <netsmb/smb_conn.h> 54#include <netsmb/smb_subr.h> 55 56#include <fs/smbfs/smbfs.h> 57#include <fs/smbfs/smbfs_node.h> 58#include <fs/smbfs/smbfs_subr.h> 59 60/*#define SMBFS_RWGENERIC*/ 61 62extern int smbfs_pbuf_freecnt; 63 64static int smbfs_fastlookup = 1; 65 66SYSCTL_DECL(_vfs_smbfs); 67SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 68 69 70#define DE_SIZE (sizeof(struct dirent)) 71 72static int 73smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 74{ 75 struct dirent de; 76 struct componentname cn; 77 struct smb_cred scred; 78 struct smbfs_fctx *ctx; 79 struct vnode *newvp; 80 struct smbnode *np = VTOSMB(vp); 81 int error/*, *eofflag = ap->a_eofflag*/; 82 long offset, limit; 83 84 np = VTOSMB(vp); 85 SMBVDEBUG("dirname='%s'\n", np->n_name); 86 smb_makescred(&scred, uio->uio_td, cred); 87 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 88 limit = uio->uio_resid / DE_SIZE; 89 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) 90 return EINVAL; 91 while (limit && offset < 2) { 92 limit--; 93 bzero((caddr_t)&de, DE_SIZE); 94 de.d_reclen = DE_SIZE; 95 de.d_fileno = (offset == 0) ? np->n_ino : 96 (np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2); 97 if (de.d_fileno == 0) 98 de.d_fileno = 0x7ffffffd + offset; 99 de.d_namlen = offset + 1; 100 de.d_name[0] = '.'; 101 de.d_name[1] = '.'; 102 de.d_name[offset + 1] = '\0'; 103 de.d_type = DT_DIR; 104 error = uiomove(&de, DE_SIZE, uio); 105 if (error) 106 return error; 107 offset++; 108 uio->uio_offset += DE_SIZE; 109 } 110 if (limit == 0) 111 return 0; 112 if (offset != np->n_dirofs || np->n_dirseq == NULL) { 113 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs); 114 if (np->n_dirseq) { 115 smbfs_findclose(np->n_dirseq, &scred); 116 np->n_dirseq = NULL; 117 } 118 np->n_dirofs = 2; 119 error = smbfs_findopen(np, "*", 1, 120 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR, 121 &scred, &ctx); 122 if (error) { 123 SMBVDEBUG("can not open search, error = %d", error); 124 return error; 125 } 126 np->n_dirseq = ctx; 127 } else 128 ctx = np->n_dirseq; 129 while (np->n_dirofs < offset) { 130 error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred); 131 if (error) { 132 smbfs_findclose(np->n_dirseq, &scred); 133 np->n_dirseq = NULL; 134 return error == ENOENT ? 0 : error; 135 } 136 } 137 error = 0; 138 for (; limit; limit--, offset++) { 139 error = smbfs_findnext(ctx, limit, &scred); 140 if (error) 141 break; 142 np->n_dirofs++; 143 bzero((caddr_t)&de, DE_SIZE); 144 de.d_reclen = DE_SIZE; 145 de.d_fileno = ctx->f_attr.fa_ino; 146 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 147 de.d_namlen = ctx->f_nmlen; 148 bcopy(ctx->f_name, de.d_name, de.d_namlen); 149 de.d_name[de.d_namlen] = '\0'; 150 if (smbfs_fastlookup) { 151 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 152 ctx->f_nmlen, &ctx->f_attr, &newvp); 153 if (!error) { 154 cn.cn_nameptr = de.d_name; 155 cn.cn_namelen = de.d_namlen; 156 cache_enter(vp, newvp, &cn); 157 vput(newvp); 158 } 159 } 160 error = uiomove(&de, DE_SIZE, uio); 161 if (error) 162 break; 163 } 164 if (error == ENOENT) 165 error = 0; 166 uio->uio_offset = offset * DE_SIZE; 167 return error; 168} 169 170int 171smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 172{ 173 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 174 struct smbnode *np = VTOSMB(vp); 175 struct thread *td; 176 struct vattr vattr; 177 struct smb_cred scred; 178 int error, lks; 179 180 /* 181 * Protect against method which is not supported for now 182 */ 183 if (uiop->uio_segflg == UIO_NOCOPY) 184 return EOPNOTSUPP; 185 186 if (vp->v_type != VREG && vp->v_type != VDIR) { 187 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 188 return EIO; 189 } 190 if (uiop->uio_resid == 0) 191 return 0; 192 if (uiop->uio_offset < 0) 193 return EINVAL; 194/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 195 return EFBIG;*/ 196 td = uiop->uio_td; 197 if (vp->v_type == VDIR) { 198 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 199 if (lks == LK_SHARED) 200 vn_lock(vp, LK_UPGRADE | LK_RETRY); 201 error = smbfs_readvdir(vp, uiop, cred); 202 if (lks == LK_SHARED) 203 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 204 return error; 205 } 206 207/* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 208 if (np->n_flag & NMODIFIED) { 209 smbfs_attr_cacheremove(vp); 210 error = VOP_GETATTR(vp, &vattr, cred); 211 if (error) 212 return error; 213 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 214 } else { 215 error = VOP_GETATTR(vp, &vattr, cred); 216 if (error) 217 return error; 218 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 219 error = smbfs_vinvalbuf(vp, td); 220 if (error) 221 return error; 222 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 223 } 224 } 225 smb_makescred(&scred, td, cred); 226 return smb_read(smp->sm_share, np->n_fid, uiop, &scred); 227} 228 229int 230smbfs_writevnode(struct vnode *vp, struct uio *uiop, 231 struct ucred *cred, int ioflag) 232{ 233 struct smbmount *smp = VTOSMBFS(vp); 234 struct smbnode *np = VTOSMB(vp); 235 struct smb_cred scred; 236 struct thread *td; 237 int error = 0; 238 239 if (vp->v_type != VREG) { 240 SMBERROR("vn types other than VREG unsupported !\n"); 241 return EIO; 242 } 243 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 244 if (uiop->uio_offset < 0) 245 return EINVAL; 246/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 247 return (EFBIG);*/ 248 td = uiop->uio_td; 249 if (ioflag & (IO_APPEND | IO_SYNC)) { 250 if (np->n_flag & NMODIFIED) { 251 smbfs_attr_cacheremove(vp); 252 error = smbfs_vinvalbuf(vp, td); 253 if (error) 254 return error; 255 } 256 if (ioflag & IO_APPEND) { 257#ifdef notyet 258 /* 259 * File size can be changed by another client 260 */ 261 smbfs_attr_cacheremove(vp); 262 error = VOP_GETATTR(vp, &vattr, cred); 263 if (error) return (error); 264#endif 265 uiop->uio_offset = np->n_size; 266 } 267 } 268 if (uiop->uio_resid == 0) 269 return 0; 270 271 if (vn_rlimit_fsize(vp, uiop, td)) 272 return (EFBIG); 273 274 smb_makescred(&scred, td, cred); 275 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 276 SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 277 if (!error) { 278 if (uiop->uio_offset > np->n_size) { 279 np->n_size = uiop->uio_offset; 280 vnode_pager_setsize(vp, np->n_size); 281 } 282 } 283 return error; 284} 285 286/* 287 * Do an I/O operation to/from a cache block. 288 */ 289int 290smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td) 291{ 292 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 293 struct smbnode *np = VTOSMB(vp); 294 struct uio uio, *uiop = &uio; 295 struct iovec io; 296 struct smb_cred scred; 297 int error = 0; 298 299 uiop->uio_iov = &io; 300 uiop->uio_iovcnt = 1; 301 uiop->uio_segflg = UIO_SYSSPACE; 302 uiop->uio_td = td; 303 304 smb_makescred(&scred, td, cr); 305 306 if (bp->b_iocmd == BIO_READ) { 307 io.iov_len = uiop->uio_resid = bp->b_bcount; 308 io.iov_base = bp->b_data; 309 uiop->uio_rw = UIO_READ; 310 switch (vp->v_type) { 311 case VREG: 312 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 313 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred); 314 if (error) 315 break; 316 if (uiop->uio_resid) { 317 int left = uiop->uio_resid; 318 int nread = bp->b_bcount - left; 319 if (left > 0) 320 bzero((char *)bp->b_data + nread, left); 321 } 322 break; 323 default: 324 printf("smbfs_doio: type %x unexpected\n",vp->v_type); 325 break; 326 }; 327 if (error) { 328 bp->b_error = error; 329 bp->b_ioflags |= BIO_ERROR; 330 } 331 } else { /* write */ 332 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 333 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 334 335 if (bp->b_dirtyend > bp->b_dirtyoff) { 336 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 337 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 338 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 339 uiop->uio_rw = UIO_WRITE; 340 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 341 342 /* 343 * For an interrupted write, the buffer is still valid 344 * and the write hasn't been pushed to the server yet, 345 * so we can't set BIO_ERROR and report the interruption 346 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 347 * is not relevant, so the rpc attempt is essentially 348 * a noop. For the case of a V3 write rpc not being 349 * committed to stable storage, the block is still 350 * dirty and requires either a commit rpc or another 351 * write rpc with iomode == NFSV3WRITE_FILESYNC before 352 * the block is reused. This is indicated by setting 353 * the B_DELWRI and B_NEEDCOMMIT flags. 354 */ 355 if (error == EINTR 356 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 357 int s; 358 359 s = splbio(); 360 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 361 if ((bp->b_flags & B_ASYNC) == 0) 362 bp->b_flags |= B_EINTR; 363 if ((bp->b_flags & B_PAGING) == 0) { 364 bdirty(bp); 365 bp->b_flags &= ~B_DONE; 366 } 367 if ((bp->b_flags & B_ASYNC) == 0) 368 bp->b_flags |= B_EINTR; 369 splx(s); 370 } else { 371 if (error) { 372 bp->b_ioflags |= BIO_ERROR; 373 bp->b_error = error; 374 } 375 bp->b_dirtyoff = bp->b_dirtyend = 0; 376 } 377 } else { 378 bp->b_resid = 0; 379 bufdone(bp); 380 return 0; 381 } 382 } 383 bp->b_resid = uiop->uio_resid; 384 bufdone(bp); 385 return error; 386} 387 388/* 389 * Vnode op for VM getpages. 390 * Wish wish .... get rid from multiple IO routines 391 */ 392int 393smbfs_getpages(ap) 394 struct vop_getpages_args /* { 395 struct vnode *a_vp; 396 vm_page_t *a_m; 397 int a_count; 398 int a_reqpage; 399 vm_ooffset_t a_offset; 400 } */ *ap; 401{ 402#ifdef SMBFS_RWGENERIC 403 return vop_stdgetpages(ap); 404#else 405 int i, error, nextoff, size, toff, npages, count, reqpage; 406 struct uio uio; 407 struct iovec iov; 408 vm_offset_t kva; 409 struct buf *bp; 410 struct vnode *vp; 411 struct thread *td; 412 struct ucred *cred; 413 struct smbmount *smp; 414 struct smbnode *np; 415 struct smb_cred scred; 416 vm_object_t object; 417 vm_page_t *pages, m; 418 419 vp = ap->a_vp; 420 if ((object = vp->v_object) == NULL) { 421 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 422 return VM_PAGER_ERROR; 423 } 424 425 td = curthread; /* XXX */ 426 cred = td->td_ucred; /* XXX */ 427 np = VTOSMB(vp); 428 smp = VFSTOSMBFS(vp->v_mount); 429 pages = ap->a_m; 430 count = ap->a_count; 431 npages = btoc(count); 432 reqpage = ap->a_reqpage; 433 434 /* 435 * If the requested page is partially valid, just return it and 436 * allow the pager to zero-out the blanks. Partially valid pages 437 * can only occur at the file EOF. 438 */ 439 m = pages[reqpage]; 440 441 VM_OBJECT_LOCK(object); 442 if (m->valid != 0) { 443 for (i = 0; i < npages; ++i) { 444 if (i != reqpage) { 445 vm_page_lock(pages[i]); 446 vm_page_free(pages[i]); 447 vm_page_unlock(pages[i]); 448 } 449 } 450 VM_OBJECT_UNLOCK(object); 451 return 0; 452 } 453 VM_OBJECT_UNLOCK(object); 454 455 smb_makescred(&scred, td, cred); 456 457 bp = getpbuf(&smbfs_pbuf_freecnt); 458 459 kva = (vm_offset_t) bp->b_data; 460 pmap_qenter(kva, pages, npages); 461 PCPU_INC(cnt.v_vnodein); 462 PCPU_ADD(cnt.v_vnodepgsin, npages); 463 464 iov.iov_base = (caddr_t) kva; 465 iov.iov_len = count; 466 uio.uio_iov = &iov; 467 uio.uio_iovcnt = 1; 468 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 469 uio.uio_resid = count; 470 uio.uio_segflg = UIO_SYSSPACE; 471 uio.uio_rw = UIO_READ; 472 uio.uio_td = td; 473 474 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred); 475 pmap_qremove(kva, npages); 476 477 relpbuf(bp, &smbfs_pbuf_freecnt); 478 479 VM_OBJECT_LOCK(object); 480 if (error && (uio.uio_resid == count)) { 481 printf("smbfs_getpages: error %d\n",error); 482 for (i = 0; i < npages; i++) { 483 if (reqpage != i) { 484 vm_page_lock(pages[i]); 485 vm_page_free(pages[i]); 486 vm_page_unlock(pages[i]); 487 } 488 } 489 VM_OBJECT_UNLOCK(object); 490 return VM_PAGER_ERROR; 491 } 492 493 size = count - uio.uio_resid; 494 495 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 496 vm_page_t m; 497 nextoff = toff + PAGE_SIZE; 498 m = pages[i]; 499 500 if (nextoff <= size) { 501 /* 502 * Read operation filled an entire page 503 */ 504 m->valid = VM_PAGE_BITS_ALL; 505 KASSERT(m->dirty == 0, 506 ("smbfs_getpages: page %p is dirty", m)); 507 } else if (size > toff) { 508 /* 509 * Read operation filled a partial page. 510 */ 511 m->valid = 0; 512 vm_page_set_valid(m, 0, size - toff); 513 KASSERT(m->dirty == 0, 514 ("smbfs_getpages: page %p is dirty", m)); 515 } else { 516 /* 517 * Read operation was short. If no error occured 518 * we may have hit a zero-fill section. We simply 519 * leave valid set to 0. 520 */ 521 ; 522 } 523 524 if (i != reqpage) { 525 /* 526 * Whether or not to leave the page activated is up in 527 * the air, but we should put the page on a page queue 528 * somewhere (it already is in the object). Result: 529 * It appears that emperical results show that 530 * deactivating pages is best. 531 */ 532 533 /* 534 * Just in case someone was asking for this page we 535 * now tell them that it is ok to use. 536 */ 537 if (!error) { 538 if (m->oflags & VPO_WANTED) { 539 vm_page_lock(m); 540 vm_page_activate(m); 541 vm_page_unlock(m); 542 } else { 543 vm_page_lock(m); 544 vm_page_deactivate(m); 545 vm_page_unlock(m); 546 } 547 vm_page_wakeup(m); 548 } else { 549 vm_page_lock(m); 550 vm_page_free(m); 551 vm_page_unlock(m); 552 } 553 } 554 } 555 VM_OBJECT_UNLOCK(object); 556 return 0; 557#endif /* SMBFS_RWGENERIC */ 558} 559 560/* 561 * Vnode op for VM putpages. 562 * possible bug: all IO done in sync mode 563 * Note that vop_close always invalidate pages before close, so it's 564 * not necessary to open vnode. 565 */ 566int 567smbfs_putpages(ap) 568 struct vop_putpages_args /* { 569 struct vnode *a_vp; 570 vm_page_t *a_m; 571 int a_count; 572 int a_sync; 573 int *a_rtvals; 574 vm_ooffset_t a_offset; 575 } */ *ap; 576{ 577 int error; 578 struct vnode *vp = ap->a_vp; 579 struct thread *td; 580 struct ucred *cred; 581 582#ifdef SMBFS_RWGENERIC 583 td = curthread; /* XXX */ 584 cred = td->td_ucred; /* XXX */ 585 VOP_OPEN(vp, FWRITE, cred, td, NULL); 586 error = vop_stdputpages(ap); 587 VOP_CLOSE(vp, FWRITE, cred, td); 588 return error; 589#else 590 struct uio uio; 591 struct iovec iov; 592 vm_offset_t kva; 593 struct buf *bp; 594 int i, npages, count; 595 int *rtvals; 596 struct smbmount *smp; 597 struct smbnode *np; 598 struct smb_cred scred; 599 vm_page_t *pages; 600 601 td = curthread; /* XXX */ 602 cred = td->td_ucred; /* XXX */ 603/* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 604 np = VTOSMB(vp); 605 smp = VFSTOSMBFS(vp->v_mount); 606 pages = ap->a_m; 607 count = ap->a_count; 608 rtvals = ap->a_rtvals; 609 npages = btoc(count); 610 611 for (i = 0; i < npages; i++) { 612 rtvals[i] = VM_PAGER_AGAIN; 613 } 614 615 bp = getpbuf(&smbfs_pbuf_freecnt); 616 617 kva = (vm_offset_t) bp->b_data; 618 pmap_qenter(kva, pages, npages); 619 PCPU_INC(cnt.v_vnodeout); 620 PCPU_ADD(cnt.v_vnodepgsout, count); 621 622 iov.iov_base = (caddr_t) kva; 623 iov.iov_len = count; 624 uio.uio_iov = &iov; 625 uio.uio_iovcnt = 1; 626 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 627 uio.uio_resid = count; 628 uio.uio_segflg = UIO_SYSSPACE; 629 uio.uio_rw = UIO_WRITE; 630 uio.uio_td = td; 631 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 632 633 smb_makescred(&scred, td, cred); 634 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred); 635/* VOP_CLOSE(vp, FWRITE, cred, td);*/ 636 SMBVDEBUG("paged write done: %d\n", error); 637 638 pmap_qremove(kva, npages); 639 640 relpbuf(bp, &smbfs_pbuf_freecnt); 641 642 if (!error) { 643 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE; 644 vm_page_lock_queues(); 645 for (i = 0; i < nwritten; i++) { 646 rtvals[i] = VM_PAGER_OK; 647 vm_page_undirty(pages[i]); 648 } 649 vm_page_unlock_queues(); 650 } 651 return rtvals[0]; 652#endif /* SMBFS_RWGENERIC */ 653} 654 655/* 656 * Flush and invalidate all dirty buffers. If another process is already 657 * doing the flush, just wait for completion. 658 */ 659int 660smbfs_vinvalbuf(struct vnode *vp, struct thread *td) 661{ 662 struct smbnode *np = VTOSMB(vp); 663 int error = 0; 664 665 if (vp->v_iflag & VI_DOOMED) 666 return 0; 667 668 while (np->n_flag & NFLUSHINPROG) { 669 np->n_flag |= NFLUSHWANT; 670 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 671 error = smb_td_intr(td); 672 if (error == EINTR) 673 return EINTR; 674 } 675 np->n_flag |= NFLUSHINPROG; 676 677 if (vp->v_bufobj.bo_object != NULL) { 678 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 679 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 680 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 681 } 682 683 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 684 while (error) { 685 if (error == ERESTART || error == EINTR) { 686 np->n_flag &= ~NFLUSHINPROG; 687 if (np->n_flag & NFLUSHWANT) { 688 np->n_flag &= ~NFLUSHWANT; 689 wakeup(&np->n_flag); 690 } 691 return EINTR; 692 } 693 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 694 } 695 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 696 if (np->n_flag & NFLUSHWANT) { 697 np->n_flag &= ~NFLUSHWANT; 698 wakeup(&np->n_flag); 699 } 700 return (error); 701} 702