smbfs_io.c revision 239065
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 239065 2012-08-05 14:11:42Z kib $ 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_param.h> 45#include <vm/vm_page.h> 46#include <vm/vm_extern.h> 47#include <vm/vm_object.h> 48#include <vm/vm_pager.h> 49#include <vm/vnode_pager.h> 50/* 51#include <sys/ioccom.h> 52*/ 53#include <netsmb/smb.h> 54#include <netsmb/smb_conn.h> 55#include <netsmb/smb_subr.h> 56 57#include <fs/smbfs/smbfs.h> 58#include <fs/smbfs/smbfs_node.h> 59#include <fs/smbfs/smbfs_subr.h> 60 61/*#define SMBFS_RWGENERIC*/ 62 63extern int smbfs_pbuf_freecnt; 64 65static int smbfs_fastlookup = 1; 66 67SYSCTL_DECL(_vfs_smbfs); 68SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 69 70 71#define DE_SIZE (sizeof(struct dirent)) 72 73static int 74smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 75{ 76 struct dirent de; 77 struct componentname cn; 78 struct smb_cred scred; 79 struct smbfs_fctx *ctx; 80 struct vnode *newvp; 81 struct smbnode *np = VTOSMB(vp); 82 int error/*, *eofflag = ap->a_eofflag*/; 83 long offset, limit; 84 85 np = VTOSMB(vp); 86 SMBVDEBUG("dirname='%s'\n", np->n_name); 87 smb_makescred(&scred, uio->uio_td, cred); 88 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 89 limit = uio->uio_resid / DE_SIZE; 90 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) 91 return EINVAL; 92 while (limit && offset < 2) { 93 limit--; 94 bzero((caddr_t)&de, DE_SIZE); 95 de.d_reclen = DE_SIZE; 96 de.d_fileno = (offset == 0) ? np->n_ino : 97 (np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2); 98 if (de.d_fileno == 0) 99 de.d_fileno = 0x7ffffffd + offset; 100 de.d_namlen = offset + 1; 101 de.d_name[0] = '.'; 102 de.d_name[1] = '.'; 103 de.d_name[offset + 1] = '\0'; 104 de.d_type = DT_DIR; 105 error = uiomove(&de, DE_SIZE, uio); 106 if (error) 107 return error; 108 offset++; 109 uio->uio_offset += DE_SIZE; 110 } 111 if (limit == 0) 112 return 0; 113 if (offset != np->n_dirofs || np->n_dirseq == NULL) { 114 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs); 115 if (np->n_dirseq) { 116 smbfs_findclose(np->n_dirseq, &scred); 117 np->n_dirseq = NULL; 118 } 119 np->n_dirofs = 2; 120 error = smbfs_findopen(np, "*", 1, 121 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR, 122 &scred, &ctx); 123 if (error) { 124 SMBVDEBUG("can not open search, error = %d", error); 125 return error; 126 } 127 np->n_dirseq = ctx; 128 } else 129 ctx = np->n_dirseq; 130 while (np->n_dirofs < offset) { 131 error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred); 132 if (error) { 133 smbfs_findclose(np->n_dirseq, &scred); 134 np->n_dirseq = NULL; 135 return error == ENOENT ? 0 : error; 136 } 137 } 138 error = 0; 139 for (; limit; limit--, offset++) { 140 error = smbfs_findnext(ctx, limit, &scred); 141 if (error) 142 break; 143 np->n_dirofs++; 144 bzero((caddr_t)&de, DE_SIZE); 145 de.d_reclen = DE_SIZE; 146 de.d_fileno = ctx->f_attr.fa_ino; 147 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 148 de.d_namlen = ctx->f_nmlen; 149 bcopy(ctx->f_name, de.d_name, de.d_namlen); 150 de.d_name[de.d_namlen] = '\0'; 151 if (smbfs_fastlookup) { 152 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 153 ctx->f_nmlen, &ctx->f_attr, &newvp); 154 if (!error) { 155 cn.cn_nameptr = de.d_name; 156 cn.cn_namelen = de.d_namlen; 157 cache_enter(vp, newvp, &cn); 158 vput(newvp); 159 } 160 } 161 error = uiomove(&de, DE_SIZE, uio); 162 if (error) 163 break; 164 } 165 if (error == ENOENT) 166 error = 0; 167 uio->uio_offset = offset * DE_SIZE; 168 return error; 169} 170 171int 172smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 173{ 174 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 175 struct smbnode *np = VTOSMB(vp); 176 struct thread *td; 177 struct vattr vattr; 178 struct smb_cred scred; 179 int error, lks; 180 181 /* 182 * Protect against method which is not supported for now 183 */ 184 if (uiop->uio_segflg == UIO_NOCOPY) 185 return EOPNOTSUPP; 186 187 if (vp->v_type != VREG && vp->v_type != VDIR) { 188 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 189 return EIO; 190 } 191 if (uiop->uio_resid == 0) 192 return 0; 193 if (uiop->uio_offset < 0) 194 return EINVAL; 195/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 196 return EFBIG;*/ 197 td = uiop->uio_td; 198 if (vp->v_type == VDIR) { 199 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 200 if (lks == LK_SHARED) 201 vn_lock(vp, LK_UPGRADE | LK_RETRY); 202 error = smbfs_readvdir(vp, uiop, cred); 203 if (lks == LK_SHARED) 204 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 205 return error; 206 } 207 208/* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 209 if (np->n_flag & NMODIFIED) { 210 smbfs_attr_cacheremove(vp); 211 error = VOP_GETATTR(vp, &vattr, cred); 212 if (error) 213 return error; 214 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 215 } else { 216 error = VOP_GETATTR(vp, &vattr, cred); 217 if (error) 218 return error; 219 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 220 error = smbfs_vinvalbuf(vp, td); 221 if (error) 222 return error; 223 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 224 } 225 } 226 smb_makescred(&scred, td, cred); 227 return smb_read(smp->sm_share, np->n_fid, uiop, &scred); 228} 229 230int 231smbfs_writevnode(struct vnode *vp, struct uio *uiop, 232 struct ucred *cred, int ioflag) 233{ 234 struct smbmount *smp = VTOSMBFS(vp); 235 struct smbnode *np = VTOSMB(vp); 236 struct smb_cred scred; 237 struct thread *td; 238 int error = 0; 239 240 if (vp->v_type != VREG) { 241 SMBERROR("vn types other than VREG unsupported !\n"); 242 return EIO; 243 } 244 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 245 if (uiop->uio_offset < 0) 246 return EINVAL; 247/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 248 return (EFBIG);*/ 249 td = uiop->uio_td; 250 if (ioflag & (IO_APPEND | IO_SYNC)) { 251 if (np->n_flag & NMODIFIED) { 252 smbfs_attr_cacheremove(vp); 253 error = smbfs_vinvalbuf(vp, td); 254 if (error) 255 return error; 256 } 257 if (ioflag & IO_APPEND) { 258#ifdef notyet 259 /* 260 * File size can be changed by another client 261 */ 262 smbfs_attr_cacheremove(vp); 263 error = VOP_GETATTR(vp, &vattr, cred); 264 if (error) return (error); 265#endif 266 uiop->uio_offset = np->n_size; 267 } 268 } 269 if (uiop->uio_resid == 0) 270 return 0; 271 272 if (vn_rlimit_fsize(vp, uiop, td)) 273 return (EFBIG); 274 275 smb_makescred(&scred, td, cred); 276 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 277 SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 278 if (!error) { 279 if (uiop->uio_offset > np->n_size) { 280 np->n_size = uiop->uio_offset; 281 vnode_pager_setsize(vp, np->n_size); 282 } 283 } 284 return error; 285} 286 287/* 288 * Do an I/O operation to/from a cache block. 289 */ 290int 291smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td) 292{ 293 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 294 struct smbnode *np = VTOSMB(vp); 295 struct uio uio, *uiop = &uio; 296 struct iovec io; 297 struct smb_cred scred; 298 int error = 0; 299 300 uiop->uio_iov = &io; 301 uiop->uio_iovcnt = 1; 302 uiop->uio_segflg = UIO_SYSSPACE; 303 uiop->uio_td = td; 304 305 smb_makescred(&scred, td, cr); 306 307 if (bp->b_iocmd == BIO_READ) { 308 io.iov_len = uiop->uio_resid = bp->b_bcount; 309 io.iov_base = bp->b_data; 310 uiop->uio_rw = UIO_READ; 311 switch (vp->v_type) { 312 case VREG: 313 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 314 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred); 315 if (error) 316 break; 317 if (uiop->uio_resid) { 318 int left = uiop->uio_resid; 319 int nread = bp->b_bcount - left; 320 if (left > 0) 321 bzero((char *)bp->b_data + nread, left); 322 } 323 break; 324 default: 325 printf("smbfs_doio: type %x unexpected\n",vp->v_type); 326 break; 327 }; 328 if (error) { 329 bp->b_error = error; 330 bp->b_ioflags |= BIO_ERROR; 331 } 332 } else { /* write */ 333 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 334 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 335 336 if (bp->b_dirtyend > bp->b_dirtyoff) { 337 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 338 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 339 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 340 uiop->uio_rw = UIO_WRITE; 341 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 342 343 /* 344 * For an interrupted write, the buffer is still valid 345 * and the write hasn't been pushed to the server yet, 346 * so we can't set BIO_ERROR and report the interruption 347 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 348 * is not relevant, so the rpc attempt is essentially 349 * a noop. For the case of a V3 write rpc not being 350 * committed to stable storage, the block is still 351 * dirty and requires either a commit rpc or another 352 * write rpc with iomode == NFSV3WRITE_FILESYNC before 353 * the block is reused. This is indicated by setting 354 * the B_DELWRI and B_NEEDCOMMIT flags. 355 */ 356 if (error == EINTR 357 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 358 int s; 359 360 s = splbio(); 361 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 362 if ((bp->b_flags & B_ASYNC) == 0) 363 bp->b_flags |= B_EINTR; 364 if ((bp->b_flags & B_PAGING) == 0) { 365 bdirty(bp); 366 bp->b_flags &= ~B_DONE; 367 } 368 if ((bp->b_flags & B_ASYNC) == 0) 369 bp->b_flags |= B_EINTR; 370 splx(s); 371 } else { 372 if (error) { 373 bp->b_ioflags |= BIO_ERROR; 374 bp->b_error = error; 375 } 376 bp->b_dirtyoff = bp->b_dirtyend = 0; 377 } 378 } else { 379 bp->b_resid = 0; 380 bufdone(bp); 381 return 0; 382 } 383 } 384 bp->b_resid = uiop->uio_resid; 385 bufdone(bp); 386 return error; 387} 388 389/* 390 * Vnode op for VM getpages. 391 * Wish wish .... get rid from multiple IO routines 392 */ 393int 394smbfs_getpages(ap) 395 struct vop_getpages_args /* { 396 struct vnode *a_vp; 397 vm_page_t *a_m; 398 int a_count; 399 int a_reqpage; 400 vm_ooffset_t a_offset; 401 } */ *ap; 402{ 403#ifdef SMBFS_RWGENERIC 404 return vop_stdgetpages(ap); 405#else 406 int i, error, nextoff, size, toff, npages, count, reqpage; 407 struct uio uio; 408 struct iovec iov; 409 vm_offset_t kva; 410 struct buf *bp; 411 struct vnode *vp; 412 struct thread *td; 413 struct ucred *cred; 414 struct smbmount *smp; 415 struct smbnode *np; 416 struct smb_cred scred; 417 vm_object_t object; 418 vm_page_t *pages, m; 419 420 vp = ap->a_vp; 421 if ((object = vp->v_object) == NULL) { 422 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 423 return VM_PAGER_ERROR; 424 } 425 426 td = curthread; /* XXX */ 427 cred = td->td_ucred; /* XXX */ 428 np = VTOSMB(vp); 429 smp = VFSTOSMBFS(vp->v_mount); 430 pages = ap->a_m; 431 count = ap->a_count; 432 npages = btoc(count); 433 reqpage = ap->a_reqpage; 434 435 /* 436 * If the requested page is partially valid, just return it and 437 * allow the pager to zero-out the blanks. Partially valid pages 438 * can only occur at the file EOF. 439 */ 440 m = pages[reqpage]; 441 442 VM_OBJECT_LOCK(object); 443 if (m->valid != 0) { 444 for (i = 0; i < npages; ++i) { 445 if (i != reqpage) { 446 vm_page_lock(pages[i]); 447 vm_page_free(pages[i]); 448 vm_page_unlock(pages[i]); 449 } 450 } 451 VM_OBJECT_UNLOCK(object); 452 return 0; 453 } 454 VM_OBJECT_UNLOCK(object); 455 456 smb_makescred(&scred, td, cred); 457 458 bp = getpbuf(&smbfs_pbuf_freecnt); 459 460 kva = (vm_offset_t) bp->b_data; 461 pmap_qenter(kva, pages, npages); 462 PCPU_INC(cnt.v_vnodein); 463 PCPU_ADD(cnt.v_vnodepgsin, npages); 464 465 iov.iov_base = (caddr_t) kva; 466 iov.iov_len = count; 467 uio.uio_iov = &iov; 468 uio.uio_iovcnt = 1; 469 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 470 uio.uio_resid = count; 471 uio.uio_segflg = UIO_SYSSPACE; 472 uio.uio_rw = UIO_READ; 473 uio.uio_td = td; 474 475 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred); 476 pmap_qremove(kva, npages); 477 478 relpbuf(bp, &smbfs_pbuf_freecnt); 479 480 VM_OBJECT_LOCK(object); 481 if (error && (uio.uio_resid == count)) { 482 printf("smbfs_getpages: error %d\n",error); 483 for (i = 0; i < npages; i++) { 484 if (reqpage != i) { 485 vm_page_lock(pages[i]); 486 vm_page_free(pages[i]); 487 vm_page_unlock(pages[i]); 488 } 489 } 490 VM_OBJECT_UNLOCK(object); 491 return VM_PAGER_ERROR; 492 } 493 494 size = count - uio.uio_resid; 495 496 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 497 vm_page_t m; 498 nextoff = toff + PAGE_SIZE; 499 m = pages[i]; 500 501 if (nextoff <= size) { 502 /* 503 * Read operation filled an entire page 504 */ 505 m->valid = VM_PAGE_BITS_ALL; 506 KASSERT(m->dirty == 0, 507 ("smbfs_getpages: page %p is dirty", m)); 508 } else if (size > toff) { 509 /* 510 * Read operation filled a partial page. 511 */ 512 m->valid = 0; 513 vm_page_set_valid_range(m, 0, size - toff); 514 KASSERT(m->dirty == 0, 515 ("smbfs_getpages: page %p is dirty", m)); 516 } else { 517 /* 518 * Read operation was short. If no error occured 519 * we may have hit a zero-fill section. We simply 520 * leave valid set to 0. 521 */ 522 ; 523 } 524 525 if (i != reqpage) 526 vm_page_readahead_finish(m, error); 527 } 528 VM_OBJECT_UNLOCK(object); 529 return 0; 530#endif /* SMBFS_RWGENERIC */ 531} 532 533/* 534 * Vnode op for VM putpages. 535 * possible bug: all IO done in sync mode 536 * Note that vop_close always invalidate pages before close, so it's 537 * not necessary to open vnode. 538 */ 539int 540smbfs_putpages(ap) 541 struct vop_putpages_args /* { 542 struct vnode *a_vp; 543 vm_page_t *a_m; 544 int a_count; 545 int a_sync; 546 int *a_rtvals; 547 vm_ooffset_t a_offset; 548 } */ *ap; 549{ 550 int error; 551 struct vnode *vp = ap->a_vp; 552 struct thread *td; 553 struct ucred *cred; 554 555#ifdef SMBFS_RWGENERIC 556 td = curthread; /* XXX */ 557 cred = td->td_ucred; /* XXX */ 558 VOP_OPEN(vp, FWRITE, cred, td, NULL); 559 error = vop_stdputpages(ap); 560 VOP_CLOSE(vp, FWRITE, cred, td); 561 return error; 562#else 563 struct uio uio; 564 struct iovec iov; 565 vm_offset_t kva; 566 struct buf *bp; 567 int i, npages, count; 568 int *rtvals; 569 struct smbmount *smp; 570 struct smbnode *np; 571 struct smb_cred scred; 572 vm_page_t *pages; 573 574 td = curthread; /* XXX */ 575 cred = td->td_ucred; /* XXX */ 576/* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 577 np = VTOSMB(vp); 578 smp = VFSTOSMBFS(vp->v_mount); 579 pages = ap->a_m; 580 count = ap->a_count; 581 rtvals = ap->a_rtvals; 582 npages = btoc(count); 583 584 for (i = 0; i < npages; i++) { 585 rtvals[i] = VM_PAGER_ERROR; 586 } 587 588 bp = getpbuf(&smbfs_pbuf_freecnt); 589 590 kva = (vm_offset_t) bp->b_data; 591 pmap_qenter(kva, pages, npages); 592 PCPU_INC(cnt.v_vnodeout); 593 PCPU_ADD(cnt.v_vnodepgsout, count); 594 595 iov.iov_base = (caddr_t) kva; 596 iov.iov_len = count; 597 uio.uio_iov = &iov; 598 uio.uio_iovcnt = 1; 599 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 600 uio.uio_resid = count; 601 uio.uio_segflg = UIO_SYSSPACE; 602 uio.uio_rw = UIO_WRITE; 603 uio.uio_td = td; 604 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 605 606 smb_makescred(&scred, td, cred); 607 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred); 608/* VOP_CLOSE(vp, FWRITE, cred, td);*/ 609 SMBVDEBUG("paged write done: %d\n", error); 610 611 pmap_qremove(kva, npages); 612 613 relpbuf(bp, &smbfs_pbuf_freecnt); 614 615 if (!error) 616 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid); 617 return rtvals[0]; 618#endif /* SMBFS_RWGENERIC */ 619} 620 621/* 622 * Flush and invalidate all dirty buffers. If another process is already 623 * doing the flush, just wait for completion. 624 */ 625int 626smbfs_vinvalbuf(struct vnode *vp, struct thread *td) 627{ 628 struct smbnode *np = VTOSMB(vp); 629 int error = 0; 630 631 if (vp->v_iflag & VI_DOOMED) 632 return 0; 633 634 while (np->n_flag & NFLUSHINPROG) { 635 np->n_flag |= NFLUSHWANT; 636 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 637 error = smb_td_intr(td); 638 if (error == EINTR) 639 return EINTR; 640 } 641 np->n_flag |= NFLUSHINPROG; 642 643 if (vp->v_bufobj.bo_object != NULL) { 644 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 645 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 646 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 647 } 648 649 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 650 while (error) { 651 if (error == ERESTART || error == EINTR) { 652 np->n_flag &= ~NFLUSHINPROG; 653 if (np->n_flag & NFLUSHWANT) { 654 np->n_flag &= ~NFLUSHWANT; 655 wakeup(&np->n_flag); 656 } 657 return EINTR; 658 } 659 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 660 } 661 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 662 if (np->n_flag & NFLUSHWANT) { 663 np->n_flag &= ~NFLUSHWANT; 664 wakeup(&np->n_flag); 665 } 666 return (error); 667} 668