1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 */ 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/rwlock.h> 40#include <sys/signalvar.h> 41#include <sys/sysctl.h> 42#include <sys/vmmeter.h> 43 44#include <vm/vm.h> 45#include <vm/vm_param.h> 46#include <vm/vm_page.h> 47#include <vm/vm_extern.h> 48#include <vm/vm_object.h> 49#include <vm/vm_pager.h> 50#include <vm/vnode_pager.h> 51/* 52#include <sys/ioccom.h> 53*/ 54#include <netsmb/smb.h> 55#include <netsmb/smb_conn.h> 56#include <netsmb/smb_subr.h> 57 58#include <fs/smbfs/smbfs.h> 59#include <fs/smbfs/smbfs_node.h> 60#include <fs/smbfs/smbfs_subr.h> 61 62/*#define SMBFS_RWGENERIC*/ 63 64extern uma_zone_t smbfs_pbuf_zone; 65 66static int smbfs_fastlookup = 1; 67 68SYSCTL_DECL(_vfs_smbfs); 69SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 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 scred = smbfs_malloc_scred(); 88 smb_makescred(scred, uio->uio_td, cred); 89 offset = uio->uio_offset / DE_SIZE; /* offset in the directory */ 90 limit = uio->uio_resid / DE_SIZE; 91 if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) { 92 error = EINVAL; 93 goto out; 94 } 95 while (limit && offset < 2) { 96 limit--; 97 bzero((caddr_t)&de, DE_SIZE); 98 de.d_reclen = DE_SIZE; 99 de.d_fileno = (offset == 0) ? np->n_ino : 100 (np->n_parent ? np->n_parentino : 2); 101 if (de.d_fileno == 0) 102 de.d_fileno = 0x7ffffffd + offset; 103 de.d_off = offset + 1; 104 de.d_namlen = offset + 1; 105 de.d_name[0] = '.'; 106 de.d_name[1] = '.'; 107 de.d_type = DT_DIR; 108 dirent_terminate(&de); 109 error = uiomove(&de, DE_SIZE, uio); 110 if (error) 111 goto out; 112 offset++; 113 uio->uio_offset += DE_SIZE; 114 } 115 if (limit == 0) { 116 error = 0; 117 goto out; 118 } 119 if (offset != np->n_dirofs || np->n_dirseq == NULL) { 120 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs); 121 if (np->n_dirseq) { 122 smbfs_findclose(np->n_dirseq, scred); 123 np->n_dirseq = NULL; 124 } 125 np->n_dirofs = 2; 126 error = smbfs_findopen(np, "*", 1, 127 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR, 128 scred, &ctx); 129 if (error) { 130 SMBVDEBUG("can not open search, error = %d", error); 131 goto out; 132 } 133 np->n_dirseq = ctx; 134 } else 135 ctx = np->n_dirseq; 136 while (np->n_dirofs < offset) { 137 error = smbfs_findnext(ctx, offset - np->n_dirofs++, scred); 138 if (error) { 139 smbfs_findclose(np->n_dirseq, scred); 140 np->n_dirseq = NULL; 141 error = ENOENT ? 0 : error; 142 goto out; 143 } 144 } 145 error = 0; 146 for (; limit; limit--, offset++) { 147 error = smbfs_findnext(ctx, limit, scred); 148 if (error) 149 break; 150 np->n_dirofs++; 151 bzero((caddr_t)&de, DE_SIZE); 152 de.d_reclen = DE_SIZE; 153 de.d_fileno = ctx->f_attr.fa_ino; 154 de.d_off = offset + 1; 155 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG; 156 de.d_namlen = ctx->f_nmlen; 157 bcopy(ctx->f_name, de.d_name, de.d_namlen); 158 dirent_terminate(&de); 159 if (smbfs_fastlookup) { 160 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 161 ctx->f_nmlen, &ctx->f_attr, &newvp); 162 if (!error) { 163 cn.cn_nameptr = de.d_name; 164 cn.cn_namelen = de.d_namlen; 165 cache_enter(vp, newvp, &cn); 166 vput(newvp); 167 } 168 } 169 error = uiomove(&de, DE_SIZE, uio); 170 if (error) 171 break; 172 } 173 if (error == ENOENT) 174 error = 0; 175 uio->uio_offset = offset * DE_SIZE; 176out: 177 smbfs_free_scred(scred); 178 return error; 179} 180 181int 182smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 183{ 184 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 185 struct smbnode *np = VTOSMB(vp); 186 struct thread *td; 187 struct vattr vattr; 188 struct smb_cred *scred; 189 int error, lks; 190 191 /* 192 * Protect against method which is not supported for now 193 */ 194 if (uiop->uio_segflg == UIO_NOCOPY) 195 return EOPNOTSUPP; 196 197 if (vp->v_type != VREG && vp->v_type != VDIR) { 198 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n"); 199 return EIO; 200 } 201 if (uiop->uio_resid == 0) 202 return 0; 203 if (uiop->uio_offset < 0) 204 return EINVAL; 205/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 206 return EFBIG;*/ 207 td = uiop->uio_td; 208 if (vp->v_type == VDIR) { 209 lks = LK_EXCLUSIVE; /* lockstatus(vp->v_vnlock); */ 210 if (lks == LK_SHARED) 211 vn_lock(vp, LK_UPGRADE | LK_RETRY); 212 error = smbfs_readvdir(vp, uiop, cred); 213 if (lks == LK_SHARED) 214 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 215 return error; 216 } 217 218/* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 219 if (np->n_flag & NMODIFIED) { 220 smbfs_attr_cacheremove(vp); 221 error = VOP_GETATTR(vp, &vattr, cred); 222 if (error) 223 return error; 224 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 225 } else { 226 error = VOP_GETATTR(vp, &vattr, cred); 227 if (error) 228 return error; 229 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 230 error = smbfs_vinvalbuf(vp, td); 231 if (error) 232 return error; 233 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 234 } 235 } 236 scred = smbfs_malloc_scred(); 237 smb_makescred(scred, td, cred); 238 error = smb_read(smp->sm_share, np->n_fid, uiop, scred); 239 smbfs_free_scred(scred); 240 return (error); 241} 242 243int 244smbfs_writevnode(struct vnode *vp, struct uio *uiop, 245 struct ucred *cred, int ioflag) 246{ 247 struct smbmount *smp = VTOSMBFS(vp); 248 struct smbnode *np = VTOSMB(vp); 249 struct smb_cred *scred; 250 struct thread *td; 251 int error = 0; 252 253 if (vp->v_type != VREG) { 254 SMBERROR("vn types other than VREG unsupported !\n"); 255 return EIO; 256 } 257 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 258 uiop->uio_resid); 259 if (uiop->uio_offset < 0) 260 return EINVAL; 261/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize) 262 return (EFBIG);*/ 263 td = uiop->uio_td; 264 if (ioflag & (IO_APPEND | IO_SYNC)) { 265 if (np->n_flag & NMODIFIED) { 266 smbfs_attr_cacheremove(vp); 267 error = smbfs_vinvalbuf(vp, td); 268 if (error) 269 return error; 270 } 271 if (ioflag & IO_APPEND) { 272#ifdef notyet 273 /* 274 * File size can be changed by another client 275 */ 276 smbfs_attr_cacheremove(vp); 277 error = VOP_GETATTR(vp, &vattr, cred); 278 if (error) return (error); 279#endif 280 uiop->uio_offset = np->n_size; 281 } 282 } 283 if (uiop->uio_resid == 0) 284 return 0; 285 286 error = vn_rlimit_fsize(vp, uiop, td); 287 if (error != 0) 288 return (error); 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 */ 308int 309smbfs_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 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 379 if ((bp->b_flags & B_ASYNC) == 0) 380 bp->b_flags |= B_EINTR; 381 if ((bp->b_flags & B_PAGING) == 0) { 382 bdirty(bp); 383 bp->b_flags &= ~B_DONE; 384 } 385 if ((bp->b_flags & B_ASYNC) == 0) 386 bp->b_flags |= B_EINTR; 387 } else { 388 if (error) { 389 bp->b_ioflags |= BIO_ERROR; 390 bp->b_error = error; 391 } 392 bp->b_dirtyoff = bp->b_dirtyend = 0; 393 } 394 } else { 395 bp->b_resid = 0; 396 bufdone(bp); 397 free(uiop, M_SMBFSDATA); 398 smbfs_free_scred(scred); 399 return 0; 400 } 401 } 402 bp->b_resid = uiop->uio_resid; 403 bufdone(bp); 404 free(uiop, M_SMBFSDATA); 405 smbfs_free_scred(scred); 406 return error; 407} 408 409/* 410 * Vnode op for VM getpages. 411 * Wish wish .... get rid from multiple IO routines 412 */ 413int 414smbfs_getpages(struct vop_getpages_args *ap) 415{ 416#ifdef SMBFS_RWGENERIC 417 return vop_stdgetpages(ap); 418#else 419 int i, error, nextoff, size, toff, npages, count; 420 struct uio uio; 421 struct iovec iov; 422 vm_offset_t kva; 423 struct buf *bp; 424 struct vnode *vp; 425 struct thread *td; 426 struct ucred *cred; 427 struct smbmount *smp; 428 struct smbnode *np; 429 struct smb_cred *scred; 430 vm_object_t object; 431 vm_page_t *pages; 432 433 vp = ap->a_vp; 434 if ((object = vp->v_object) == NULL) { 435 printf("smbfs_getpages: called with non-merged cache vnode??\n"); 436 return VM_PAGER_ERROR; 437 } 438 439 td = curthread; /* XXX */ 440 cred = td->td_ucred; /* XXX */ 441 np = VTOSMB(vp); 442 smp = VFSTOSMBFS(vp->v_mount); 443 pages = ap->a_m; 444 npages = ap->a_count; 445 446 /* 447 * If the requested page is partially valid, just return it and 448 * allow the pager to zero-out the blanks. Partially valid pages 449 * can only occur at the file EOF. 450 * 451 * XXXGL: is that true for SMB filesystem? 452 */ 453 VM_OBJECT_WLOCK(object); 454 if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0) 455 goto out; 456 VM_OBJECT_WUNLOCK(object); 457 458 scred = smbfs_malloc_scred(); 459 smb_makescred(scred, td, cred); 460 461 bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK); 462 463 kva = (vm_offset_t) bp->b_data; 464 pmap_qenter(kva, pages, npages); 465 VM_CNT_INC(v_vnodein); 466 VM_CNT_ADD(v_vnodepgsin, npages); 467 468 count = npages << PAGE_SHIFT; 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 smbfs_free_scred(scred); 481 pmap_qremove(kva, npages); 482 483 uma_zfree(smbfs_pbuf_zone, bp); 484 485 if (error && (uio.uio_resid == count)) { 486 printf("smbfs_getpages: error %d\n",error); 487 return VM_PAGER_ERROR; 488 } 489 490 size = count - uio.uio_resid; 491 492 VM_OBJECT_WLOCK(object); 493 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 494 vm_page_t m; 495 nextoff = toff + PAGE_SIZE; 496 m = pages[i]; 497 498 if (nextoff <= size) { 499 /* 500 * Read operation filled an entire page 501 */ 502 vm_page_valid(m); 503 KASSERT(m->dirty == 0, 504 ("smbfs_getpages: page %p is dirty", m)); 505 } else if (size > toff) { 506 /* 507 * Read operation filled a partial page. 508 */ 509 vm_page_invalid(m); 510 vm_page_set_valid_range(m, 0, size - toff); 511 KASSERT(m->dirty == 0, 512 ("smbfs_getpages: page %p is dirty", m)); 513 } else { 514 /* 515 * Read operation was short. If no error occurred 516 * we may have hit a zero-fill section. We simply 517 * leave valid set to 0. 518 */ 519 ; 520 } 521 } 522out: 523 VM_OBJECT_WUNLOCK(object); 524 if (ap->a_rbehind) 525 *ap->a_rbehind = 0; 526 if (ap->a_rahead) 527 *ap->a_rahead = 0; 528 return (VM_PAGER_OK); 529#endif /* SMBFS_RWGENERIC */ 530} 531 532/* 533 * Vnode op for VM putpages. 534 * possible bug: all IO done in sync mode 535 * Note that vop_close always invalidate pages before close, so it's 536 * not necessary to open vnode. 537 */ 538int 539smbfs_putpages(struct vop_putpages_args *ap) 540{ 541 int error; 542 struct vnode *vp = ap->a_vp; 543 struct thread *td; 544 struct ucred *cred; 545 546#ifdef SMBFS_RWGENERIC 547 td = curthread; /* XXX */ 548 cred = td->td_ucred; /* XXX */ 549 VOP_OPEN(vp, FWRITE, cred, td, NULL); 550 error = vop_stdputpages(ap); 551 VOP_CLOSE(vp, FWRITE, cred, td); 552 return error; 553#else 554 struct uio uio; 555 struct iovec iov; 556 vm_offset_t kva; 557 struct buf *bp; 558 int i, npages, count; 559 int *rtvals; 560 struct smbmount *smp; 561 struct smbnode *np; 562 struct smb_cred *scred; 563 vm_page_t *pages; 564 565 td = curthread; /* XXX */ 566 cred = td->td_ucred; /* XXX */ 567/* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 568 np = VTOSMB(vp); 569 smp = VFSTOSMBFS(vp->v_mount); 570 pages = ap->a_m; 571 count = ap->a_count; 572 rtvals = ap->a_rtvals; 573 npages = btoc(count); 574 575 for (i = 0; i < npages; i++) { 576 rtvals[i] = VM_PAGER_ERROR; 577 } 578 579 bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK); 580 581 kva = (vm_offset_t) bp->b_data; 582 pmap_qenter(kva, pages, npages); 583 VM_CNT_INC(v_vnodeout); 584 VM_CNT_ADD(v_vnodepgsout, count); 585 586 iov.iov_base = (caddr_t) kva; 587 iov.iov_len = count; 588 uio.uio_iov = &iov; 589 uio.uio_iovcnt = 1; 590 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 591 uio.uio_resid = count; 592 uio.uio_segflg = UIO_SYSSPACE; 593 uio.uio_rw = UIO_WRITE; 594 uio.uio_td = td; 595 SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 596 uio.uio_resid); 597 598 scred = smbfs_malloc_scred(); 599 smb_makescred(scred, td, cred); 600 error = smb_write(smp->sm_share, np->n_fid, &uio, scred); 601 smbfs_free_scred(scred); 602/* VOP_CLOSE(vp, FWRITE, cred, td);*/ 603 SMBVDEBUG("paged write done: %d\n", error); 604 605 pmap_qremove(kva, npages); 606 607 uma_zfree(smbfs_pbuf_zone, bp); 608 609 if (error == 0) { 610 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid, 611 npages * PAGE_SIZE, npages * PAGE_SIZE); 612 } 613 return (rtvals[0]); 614#endif /* SMBFS_RWGENERIC */ 615} 616 617/* 618 * Flush and invalidate all dirty buffers. If another process is already 619 * doing the flush, just wait for completion. 620 */ 621int 622smbfs_vinvalbuf(struct vnode *vp, struct thread *td) 623{ 624 struct smbnode *np = VTOSMB(vp); 625 int error = 0; 626 627 if (VN_IS_DOOMED(vp)) 628 return 0; 629 630 while (np->n_flag & NFLUSHINPROG) { 631 np->n_flag |= NFLUSHWANT; 632 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz); 633 error = smb_td_intr(td); 634 if (error == EINTR) 635 return EINTR; 636 } 637 np->n_flag |= NFLUSHINPROG; 638 639 vnode_pager_clean_sync(vp); 640 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 641 while (error) { 642 if (error == ERESTART || error == EINTR) { 643 np->n_flag &= ~NFLUSHINPROG; 644 if (np->n_flag & NFLUSHWANT) { 645 np->n_flag &= ~NFLUSHWANT; 646 wakeup(&np->n_flag); 647 } 648 return EINTR; 649 } 650 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 651 } 652 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 653 if (np->n_flag & NFLUSHWANT) { 654 np->n_flag &= ~NFLUSHWANT; 655 wakeup(&np->n_flag); 656 } 657 return (error); 658} 659