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: src/sys/fs/smbfs/smbfs_io.c,v 1.3.2.3 2003/01/17 08:20:26 tjr Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/fcntl.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 48 #include <machine/limits.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_page2.h> 52 #include <vm/vm_extern.h> 53 #include <vm/vm_object.h> 54 #include <vm/vm_pager.h> 55 #include <vm/vnode_pager.h> 56 57 #include <netproto/smb/smb.h> 58 #include <netproto/smb/smb_conn.h> 59 #include <netproto/smb/smb_subr.h> 60 61 #include "smbfs.h" 62 #include "smbfs_node.h" 63 #include "smbfs_subr.h" 64 65 #include <sys/buf.h> 66 67 #include <sys/thread2.h> 68 69 /*#define SMBFS_RWGENERIC*/ 70 71 extern int smbfs_pbuf_freecnt; 72 73 static int smbfs_fastlookup = 1; 74 75 SYSCTL_DECL(_vfs_smbfs); 76 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, ""); 77 78 static int 79 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) 80 { 81 struct smb_cred scred; 82 struct smbfs_fctx *ctx; 83 struct vnode *newvp; 84 struct smbnode *np; 85 int error, offset, retval; 86 87 np = VTOSMB(vp); 88 SMBVDEBUG("dirname='%s'\n", np->n_name); 89 smb_makescred(&scred, uio->uio_td, cred); 90 91 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX) 92 return(EINVAL); 93 94 error = 0; 95 offset = uio->uio_offset; 96 97 if (uio->uio_resid > 0 && offset < 1) { 98 if (vop_write_dirent(&error, uio, np->n_ino, DT_DIR, 1, ".")) 99 goto done; 100 if (error) 101 goto done; 102 ++offset; 103 } 104 105 if (uio->uio_resid > 0 && offset < 2) { 106 if (vop_write_dirent(&error, uio, 107 np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2, 108 DT_DIR, 2, "..")) 109 goto done; 110 if (error) 111 goto done; 112 ++offset; 113 } 114 115 if (uio->uio_resid == 0) 116 goto done; 117 118 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 } 136 while (np->n_dirofs < offset) { 137 error = smbfs_findnext(ctx, offset - np->n_dirofs, &scred); 138 ++np->n_dirofs; 139 if (error) { 140 smbfs_findclose(np->n_dirseq, &scred); 141 np->n_dirseq = NULL; 142 return error == ENOENT ? 0 : error; 143 } 144 } 145 error = 0; 146 while (uio->uio_resid > 0 && !error) { 147 /* 148 * Overestimate the size of a record a bit, doesn't really 149 * hurt to be wrong here. 150 */ 151 error = smbfs_findnext(ctx, uio->uio_resid / _DIRENT_RECLEN(255) + 1, &scred); 152 if (error) 153 break; 154 np->n_dirofs++; 155 ++offset; 156 157 retval = vop_write_dirent(&error, uio, ctx->f_attr.fa_ino, 158 (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG, 159 ctx->f_nmlen, ctx->f_name); 160 if (retval) 161 break; 162 if (smbfs_fastlookup && !error) { 163 error = smbfs_nget(vp->v_mount, vp, ctx->f_name, 164 ctx->f_nmlen, &ctx->f_attr, &newvp); 165 if (!error) 166 vput(newvp); 167 } 168 } 169 if (error == ENOENT) 170 error = 0; 171 done: 172 uio->uio_offset = offset; 173 return error; 174 } 175 176 int 177 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) 178 { 179 struct thread *td; 180 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 181 struct smbnode *np = VTOSMB(vp); 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 td = uiop->uio_td; 201 if (vp->v_type == VDIR) { 202 lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, td);*/ 203 if (lks == LK_SHARED) 204 vn_lock(vp, LK_UPGRADE | LK_RETRY); 205 error = smbfs_readvdir(vp, uiop, cred); 206 if (lks == LK_SHARED) 207 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 208 return error; 209 } 210 211 /* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/ 212 if (np->n_flag & NMODIFIED) { 213 smbfs_attr_cacheremove(vp); 214 error = VOP_GETATTR(vp, &vattr); 215 if (error) 216 return error; 217 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 218 } else { 219 error = VOP_GETATTR(vp, &vattr); 220 if (error) 221 return error; 222 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) { 223 error = smbfs_vinvalbuf(vp, V_SAVE, 1); 224 if (error) 225 return error; 226 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec; 227 } 228 } 229 smb_makescred(&scred, td, cred); 230 return smb_read(smp->sm_share, np->n_fid, uiop, &scred); 231 } 232 233 int 234 smbfs_writevnode(struct vnode *vp, struct uio *uiop, 235 struct ucred *cred, int ioflag) 236 { 237 struct thread *td; 238 struct smbmount *smp = VTOSMBFS(vp); 239 struct smbnode *np = VTOSMB(vp); 240 struct smb_cred scred; 241 int error = 0; 242 243 if (vp->v_type != VREG) { 244 SMBERROR("vn types other than VREG unsupported !\n"); 245 return EIO; 246 } 247 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 248 if (uiop->uio_offset < 0) 249 return EINVAL; 250 td = uiop->uio_td; 251 if (ioflag & (IO_APPEND | IO_SYNC)) { 252 if (np->n_flag & NMODIFIED) { 253 smbfs_attr_cacheremove(vp); 254 error = smbfs_vinvalbuf(vp, V_SAVE, 1); 255 if (error) 256 return error; 257 } 258 if (ioflag & IO_APPEND) { 259 #if 0 /* notyet */ 260 /* 261 * File size can be changed by another client 262 */ 263 smbfs_attr_cacheremove(vp); 264 error = VOP_GETATTR(vp, &vattr); 265 if (error) return (error); 266 #endif 267 uiop->uio_offset = np->n_size; 268 } 269 } 270 if (uiop->uio_resid == 0) 271 return 0; 272 if (td->td_proc && 273 uiop->uio_offset + uiop->uio_resid > 274 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 275 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 276 return EFBIG; 277 } 278 smb_makescred(&scred, td, cred); 279 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 280 SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 281 if (!error) { 282 if (uiop->uio_offset > np->n_size) { 283 np->n_size = uiop->uio_offset; 284 vnode_pager_setsize(vp, np->n_size); 285 } 286 } 287 return error; 288 } 289 290 /* 291 * Do an I/O operation to/from a cache block. 292 */ 293 int 294 smbfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td) 295 { 296 struct buf *bp = bio->bio_buf; 297 struct smbmount *smp = VFSTOSMBFS(vp->v_mount); 298 struct smbnode *np = VTOSMB(vp); 299 struct uio uio, *uiop = &uio; 300 struct iovec io; 301 struct smb_cred scred; 302 int error = 0; 303 304 uiop->uio_iov = &io; 305 uiop->uio_iovcnt = 1; 306 uiop->uio_segflg = UIO_SYSSPACE; 307 uiop->uio_td = td; 308 309 smb_makescred(&scred, td, cr); 310 311 if (bp->b_cmd == BUF_CMD_READ) { 312 io.iov_len = uiop->uio_resid = (size_t)bp->b_bcount; 313 io.iov_base = bp->b_data; 314 uiop->uio_rw = UIO_READ; 315 switch (vp->v_type) { 316 case VREG: 317 uiop->uio_offset = bio->bio_offset; 318 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred); 319 if (error) 320 break; 321 if (uiop->uio_resid) { 322 size_t left = uiop->uio_resid; 323 size_t nread = (size_t)bp->b_bcount - left; 324 if (left > 0) 325 bzero((char *)bp->b_data + nread, left); 326 } 327 break; 328 default: 329 kprintf("smbfs_doio: type %x unexpected\n",vp->v_type); 330 break; 331 } 332 if (error) { 333 bp->b_error = error; 334 bp->b_flags |= B_ERROR; 335 } 336 } else { /* write */ 337 KKASSERT(bp->b_cmd == BUF_CMD_WRITE); 338 if (bio->bio_offset + bp->b_dirtyend > np->n_size) 339 bp->b_dirtyend = np->n_size - bio->bio_offset; 340 341 if (bp->b_dirtyend > bp->b_dirtyoff) { 342 io.iov_len = uiop->uio_resid = 343 (size_t)(bp->b_dirtyend - bp->b_dirtyoff); 344 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff; 345 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 346 uiop->uio_rw = UIO_WRITE; 347 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred); 348 349 /* 350 * For an interrupted write, the buffer is still valid 351 * and the write hasn't been pushed to the server yet, 352 * so we can't set BIO_ERROR and report the interruption 353 * by setting B_EINTR. For the async case, B_EINTR 354 * is not relevant, so the rpc attempt is essentially 355 * a noop. For the case of a V3 write rpc not being 356 * committed to stable storage, the block is still 357 * dirty and requires either a commit rpc or another 358 * write rpc with iomode == NFSV3WRITE_FILESYNC before 359 * the block is reused. This is indicated by setting 360 * the B_DELWRI and B_NEEDCOMMIT flags. 361 */ 362 if (error == EINTR 363 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 364 365 crit_enter(); 366 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 367 if ((bp->b_flags & B_PAGING) == 0) 368 bdirty(bp); 369 bp->b_flags |= B_EINTR; 370 crit_exit(); 371 } else { 372 if (error) { 373 bp->b_flags |= B_ERROR; 374 bp->b_error = error; 375 } 376 bp->b_dirtyoff = bp->b_dirtyend = 0; 377 } 378 } else { 379 bp->b_resid = 0; 380 biodone(bio); 381 return 0; 382 } 383 } 384 bp->b_resid = uiop->uio_resid; 385 biodone(bio); 386 return error; 387 } 388 389 /* 390 * Vnode op for VM getpages. 391 * Wish wish .... get rid from multiple IO routines 392 * 393 * smbfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, 394 * int a_reqpage, vm_ooffset_t a_offset) 395 */ 396 int 397 smbfs_getpages(struct vop_getpages_args *ap) 398 { 399 #ifdef SMBFS_RWGENERIC 400 return vop_stdgetpages(ap); 401 #else 402 int i, error, npages; 403 int doclose; 404 size_t size, toff, nextoff, count; 405 struct uio uio; 406 struct iovec iov; 407 vm_offset_t kva; 408 struct buf *bp; 409 struct vnode *vp; 410 struct thread *td = curthread; /* XXX */ 411 struct ucred *cred; 412 struct smbmount *smp; 413 struct smbnode *np; 414 struct smb_cred scred; 415 vm_page_t *pages; 416 417 KKASSERT(td->td_proc); 418 419 vp = ap->a_vp; 420 cred = td->td_proc->p_ucred; 421 np = VTOSMB(vp); 422 smp = VFSTOSMBFS(vp->v_mount); 423 pages = ap->a_m; 424 count = (size_t)ap->a_count; 425 426 if (vp->v_object == NULL) { 427 kprintf("smbfs_getpages: called with non-merged cache vnode??\n"); 428 return VM_PAGER_ERROR; 429 } 430 smb_makescred(&scred, td, cred); 431 432 bp = getpbuf_kva(&smbfs_pbuf_freecnt); 433 npages = btoc(count); 434 kva = (vm_offset_t) bp->b_data; 435 pmap_qenter(kva, pages, npages); 436 437 iov.iov_base = (caddr_t) kva; 438 iov.iov_len = count; 439 uio.uio_iov = &iov; 440 uio.uio_iovcnt = 1; 441 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 442 uio.uio_resid = count; 443 uio.uio_segflg = UIO_SYSSPACE; 444 uio.uio_rw = UIO_READ; 445 uio.uio_td = td; 446 447 /* 448 * This is kinda nasty. Since smbfs is physically closing the 449 * fid on close(), we have to reopen it if necessary. There are 450 * other races here too, such as if another process opens the same 451 * file while we are blocked in read. XXX 452 */ 453 error = 0; 454 doclose = 0; 455 if (np->n_opencount == 0) { 456 error = smbfs_smb_open(np, SMB_AM_OPENREAD, &scred); 457 if (error == 0) 458 doclose = 1; 459 } 460 if (error == 0) 461 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred); 462 if (doclose) 463 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred); 464 pmap_qremove(kva, npages); 465 466 relpbuf(bp, &smbfs_pbuf_freecnt); 467 468 if (error && (uio.uio_resid == count)) { 469 kprintf("smbfs_getpages: error %d\n",error); 470 for (i = 0; i < npages; i++) { 471 if (ap->a_reqpage != i) 472 vnode_pager_freepage(pages[i]); 473 } 474 return VM_PAGER_ERROR; 475 } 476 477 size = count - uio.uio_resid; 478 479 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 480 vm_page_t m; 481 nextoff = toff + PAGE_SIZE; 482 m = pages[i]; 483 484 m->flags &= ~PG_ZERO; 485 486 /* 487 * NOTE: pmap dirty bit should have already been cleared. 488 * We do not clear it here. 489 */ 490 if (nextoff <= size) { 491 m->valid = VM_PAGE_BITS_ALL; 492 m->dirty = 0; 493 } else { 494 int nvalid = ((size + DEV_BSIZE - 1) - toff) & 495 ~(DEV_BSIZE - 1); 496 vm_page_set_validclean(m, 0, nvalid); 497 } 498 499 if (i != ap->a_reqpage) { 500 /* 501 * Whether or not to leave the page activated is up in 502 * the air, but we should put the page on a page queue 503 * somewhere (it already is in the object). Result: 504 * It appears that emperical results show that 505 * deactivating pages is best. 506 */ 507 508 /* 509 * Just in case someone was asking for this page we 510 * now tell them that it is ok to use. 511 */ 512 if (!error) { 513 if (m->flags & PG_REFERENCED) 514 vm_page_activate(m); 515 else 516 vm_page_deactivate(m); 517 vm_page_wakeup(m); 518 } else { 519 vnode_pager_freepage(m); 520 } 521 } 522 } 523 return 0; 524 #endif /* SMBFS_RWGENERIC */ 525 } 526 527 /* 528 * Vnode op for VM putpages. 529 * possible bug: all IO done in sync mode 530 * Note that vop_close always invalidate pages before close, so it's 531 * not necessary to open vnode. 532 * 533 * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_sync, 534 * int *a_rtvals, vm_ooffset_t a_offset) 535 */ 536 int 537 smbfs_putpages(struct vop_putpages_args *ap) 538 { 539 int error; 540 struct vnode *vp = ap->a_vp; 541 struct thread *td = curthread; /* XXX */ 542 struct ucred *cred; 543 544 #ifdef SMBFS_RWGENERIC 545 KKASSERT(td->td_proc); 546 cred = td->td_proc->p_ucred; 547 VOP_OPEN(vp, FWRITE, cred, NULL); 548 error = vop_stdputpages(ap); 549 VOP_CLOSE(vp, FWRITE, cred, NULL); 550 return error; 551 #else 552 struct uio uio; 553 struct iovec iov; 554 vm_offset_t kva; 555 struct buf *bp; 556 int i, npages, count; 557 int doclose; 558 int *rtvals; 559 struct smbmount *smp; 560 struct smbnode *np; 561 struct smb_cred scred; 562 vm_page_t *pages; 563 564 KKASSERT(td->td_proc); 565 cred = td->td_proc->p_ucred; 566 /* VOP_OPEN(vp, FWRITE, cred, NULL);*/ 567 np = VTOSMB(vp); 568 smp = VFSTOSMBFS(vp->v_mount); 569 pages = ap->a_m; 570 count = ap->a_count; 571 rtvals = ap->a_rtvals; 572 npages = btoc(count); 573 574 for (i = 0; i < npages; i++) { 575 rtvals[i] = VM_PAGER_AGAIN; 576 } 577 578 bp = getpbuf_kva(&smbfs_pbuf_freecnt); 579 kva = (vm_offset_t) bp->b_data; 580 pmap_qenter(kva, pages, npages); 581 582 iov.iov_base = (caddr_t) kva; 583 iov.iov_len = count; 584 uio.uio_iov = &iov; 585 uio.uio_iovcnt = 1; 586 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 587 uio.uio_resid = count; 588 uio.uio_segflg = UIO_SYSSPACE; 589 uio.uio_rw = UIO_WRITE; 590 uio.uio_td = td; 591 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 592 593 smb_makescred(&scred, td, cred); 594 595 /* 596 * This is kinda nasty. Since smbfs is physically closing the 597 * fid on close(), we have to reopen it if necessary. There are 598 * other races here too, such as if another process opens the same 599 * file while we are blocked in read, or the file is open read-only 600 * XXX 601 */ 602 error = 0; 603 doclose = 0; 604 if (np->n_opencount == 0) { 605 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred); 606 if (error == 0) 607 doclose = 1; 608 } 609 if (error == 0) 610 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred); 611 if (doclose) 612 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred); 613 /* VOP_CLOSE(vp, FWRITE, cred);*/ 614 SMBVDEBUG("paged write done: %d\n", error); 615 616 pmap_qremove(kva, npages); 617 relpbuf(bp, &smbfs_pbuf_freecnt); 618 619 if (!error) { 620 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE; 621 for (i = 0; i < nwritten; i++) { 622 rtvals[i] = VM_PAGER_OK; 623 vm_page_undirty(pages[i]); 624 } 625 } 626 return rtvals[0]; 627 #endif /* SMBFS_RWGENERIC */ 628 } 629 630 /* 631 * Flush and invalidate all dirty buffers. If another process is already 632 * doing the flush, just wait for completion. 633 */ 634 int 635 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg) 636 { 637 struct smbnode *np = VTOSMB(vp); 638 int error = 0, slpflag, slptimeo; 639 640 if (vp->v_flag & VRECLAIMED) 641 return 0; 642 if (intrflg) { 643 slpflag = PCATCH; 644 slptimeo = 2 * hz; 645 } else { 646 slpflag = 0; 647 slptimeo = 0; 648 } 649 while (np->n_flag & NFLUSHINPROG) { 650 np->n_flag |= NFLUSHWANT; 651 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo); 652 error = smb_proc_intr(curthread); 653 if (error == EINTR && intrflg) 654 return EINTR; 655 } 656 np->n_flag |= NFLUSHINPROG; 657 error = vinvalbuf(vp, flags, slpflag, 0); 658 while (error) { 659 if (intrflg && (error == ERESTART || error == EINTR)) { 660 np->n_flag &= ~NFLUSHINPROG; 661 if (np->n_flag & NFLUSHWANT) { 662 np->n_flag &= ~NFLUSHWANT; 663 wakeup((caddr_t)&np->n_flag); 664 } 665 return EINTR; 666 } 667 error = vinvalbuf(vp, flags, slpflag, 0); 668 } 669 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 670 if (np->n_flag & NFLUSHWANT) { 671 np->n_flag &= ~NFLUSHWANT; 672 wakeup((caddr_t)&np->n_flag); 673 } 674 return (error); 675 } 676