Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nwfs/nwfs_io.c
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1 /*- 2 * Copyright (c) 1999, 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 * $FreeBSD$ 33 * 34 */ 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/bio.h> 39 #include <sys/buf.h> 40 #include <sys/mount.h> 41 #include <sys/namei.h> 42 #include <sys/vnode.h> 43 #include <sys/dirent.h> 44 #include <sys/sysctl.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_page.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_object.h> 50 #include <vm/vm_pager.h> 51 #include <vm/vnode_pager.h> 52 53 #include <netncp/ncp.h> 54 #include <netncp/ncp_conn.h> 55 #include <netncp/ncp_subr.h> 56 #include <netncp/ncp_ncp.h> 57 58 #include <fs/nwfs/nwfs.h> 59 #include <fs/nwfs/nwfs_node.h> 60 #include <fs/nwfs/nwfs_subr.h> 61 62 static int nwfs_fastlookup = 1; 63 64 SYSCTL_DECL(_vfs_nwfs); 65 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, ""); 66 67 68 extern int nwfs_pbuf_freecnt; 69 70 #define DE_SIZE (sizeof(struct dirent)) 71 #define NWFS_RWCACHE 72 73 static int 74 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) { 75 struct nwmount *nmp = VTONWFS(vp); 76 int error, count, i; 77 struct dirent dp; 78 struct nwnode *np = VTONW(vp); 79 struct nw_entry_info fattr; 80 struct vnode *newvp; 81 struct componentname cn; 82 ncpfid fid; 83 84 np = VTONW(vp); 85 NCPVNDEBUG("dirname='%s'\n",np->n_name); 86 if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0)) 87 return (EINVAL); 88 error = 0; 89 count = 0; 90 i = uio->uio_offset / DE_SIZE; /* offset in directory */ 91 if (i == 0) { 92 error = ncp_initsearch(vp, uio->uio_td, cred); 93 if (error) { 94 NCPVNDEBUG("cannot initialize search, error=%d",error); 95 return( error ); 96 } 97 } 98 99 for (; uio->uio_resid >= DE_SIZE; i++) { 100 bzero((char *) &dp, DE_SIZE); 101 dp.d_reclen = DE_SIZE; 102 switch (i) { 103 case 0: /* `.' */ 104 case 1: /* `..' */ 105 dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id; 106 if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO; 107 dp.d_namlen = i + 1; 108 dp.d_name[0] = '.'; 109 dp.d_name[1] = '.'; 110 dp.d_name[i + 1] = '\0'; 111 dp.d_type = DT_DIR; 112 break; 113 default: 114 error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred); 115 if (error && error < 0x80) break; 116 dp.d_fileno = fattr.dirEntNum; 117 dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG; 118 dp.d_namlen = fattr.nameLen; 119 bcopy(fattr.entryName, dp.d_name, dp.d_namlen); 120 dp.d_name[dp.d_namlen] = '\0'; 121 #if 0 122 if (error && eofflag) { 123 /* *eofflag = 1;*/ 124 break; 125 } 126 #endif 127 break; 128 } 129 if (nwfs_fastlookup && !error && i > 1) { 130 fid.f_id = fattr.dirEntNum; 131 fid.f_parent = np->n_fid.f_id; 132 error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp); 133 if (!error) { 134 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec; 135 cn.cn_nameptr = dp.d_name; 136 cn.cn_namelen = dp.d_namlen; 137 cache_enter(vp, newvp, &cn); 138 vput(newvp); 139 } else 140 error = 0; 141 } 142 if (error >= 0x80) { 143 error = 0; 144 break; 145 } 146 if ((error = uiomove(&dp, DE_SIZE, uio))) 147 break; 148 } 149 150 uio->uio_offset = i * DE_SIZE; 151 return (error); 152 } 153 154 int 155 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) { 156 struct nwmount *nmp = VFSTONWFS(vp->v_mount); 157 struct nwnode *np = VTONW(vp); 158 struct thread *td; 159 struct vattr vattr; 160 int error, biosize; 161 162 if (vp->v_type != VREG && vp->v_type != VDIR) { 163 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__); 164 return EIO; 165 } 166 if (uiop->uio_resid == 0) return 0; 167 if (uiop->uio_offset < 0) return EINVAL; 168 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 169 return (EFBIG);*/ 170 td = uiop->uio_td; 171 if (vp->v_type == VDIR) { 172 error = nwfs_readvdir(vp, uiop, cred); 173 return error; 174 } 175 biosize = NWFSTOCONN(nmp)->buffer_size; 176 if (np->n_flag & NMODIFIED) { 177 nwfs_attr_cacheremove(vp); 178 error = VOP_GETATTR(vp, &vattr, cred); 179 if (error) return (error); 180 np->n_mtime = vattr.va_mtime.tv_sec; 181 } else { 182 error = VOP_GETATTR(vp, &vattr, cred); 183 if (error) return (error); 184 if (np->n_mtime != vattr.va_mtime.tv_sec) { 185 error = nwfs_vinvalbuf(vp, td); 186 if (error) return (error); 187 np->n_mtime = vattr.va_mtime.tv_sec; 188 } 189 } 190 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 191 return (error); 192 } 193 194 int 195 nwfs_writevnode(vp, uiop, cred, ioflag) 196 struct vnode *vp; 197 struct uio *uiop; 198 struct ucred *cred; 199 int ioflag; 200 { 201 struct nwmount *nmp = VTONWFS(vp); 202 struct nwnode *np = VTONW(vp); 203 struct thread *td; 204 /* struct vattr vattr;*/ 205 int error = 0; 206 207 if (vp->v_type != VREG) { 208 printf("%s: vn types other than VREG unsupported !\n",__func__); 209 return EIO; 210 } 211 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 212 if (uiop->uio_offset < 0) return EINVAL; 213 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 214 return (EFBIG);*/ 215 td = uiop->uio_td; 216 if (ioflag & (IO_APPEND | IO_SYNC)) { 217 if (np->n_flag & NMODIFIED) { 218 nwfs_attr_cacheremove(vp); 219 error = nwfs_vinvalbuf(vp, td); 220 if (error) return (error); 221 } 222 if (ioflag & IO_APPEND) { 223 /* We can relay only on local information about file size, 224 * because until file is closed NetWare will not return 225 * the correct size. */ 226 #ifdef notyet 227 nwfs_attr_cacheremove(vp); 228 error = VOP_GETATTR(vp, &vattr, cred); 229 if (error) return (error); 230 #endif 231 uiop->uio_offset = np->n_size; 232 } 233 } 234 if (uiop->uio_resid == 0) return 0; 235 236 if (vn_rlimit_fsize(vp, uiop, td)) 237 return (EFBIG); 238 239 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 240 NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 241 if (!error) { 242 if (uiop->uio_offset > np->n_size) { 243 np->n_vattr.va_size = np->n_size = uiop->uio_offset; 244 vnode_pager_setsize(vp, np->n_size); 245 } 246 } 247 return (error); 248 } 249 250 /* 251 * Do an I/O operation to/from a cache block. 252 */ 253 int 254 nwfs_doio(vp, bp, cr, td) 255 struct vnode *vp; 256 struct buf *bp; 257 struct ucred *cr; 258 struct thread *td; 259 { 260 struct uio *uiop; 261 struct nwnode *np; 262 struct nwmount *nmp; 263 int error = 0; 264 struct uio uio; 265 struct iovec io; 266 267 np = VTONW(vp); 268 nmp = VFSTONWFS(vp->v_mount); 269 uiop = &uio; 270 uiop->uio_iov = &io; 271 uiop->uio_iovcnt = 1; 272 uiop->uio_segflg = UIO_SYSSPACE; 273 uiop->uio_td = td; 274 if (bp->b_iocmd == BIO_READ) { 275 io.iov_len = uiop->uio_resid = bp->b_bcount; 276 io.iov_base = bp->b_data; 277 uiop->uio_rw = UIO_READ; 278 switch (vp->v_type) { 279 case VREG: 280 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 281 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 282 if (error) 283 break; 284 if (uiop->uio_resid) { 285 int left = uiop->uio_resid; 286 int nread = bp->b_bcount - left; 287 if (left > 0) 288 bzero((char *)bp->b_data + nread, left); 289 } 290 break; 291 /* case VDIR: 292 nfsstats.readdir_bios++; 293 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ; 294 if (nmp->nm_flag & NFSMNT_RDIRPLUS) { 295 error = nfs_readdirplusrpc(vp, uiop, cr); 296 if (error == NFSERR_NOTSUPP) 297 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 298 } 299 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 300 error = nfs_readdirrpc(vp, uiop, cr); 301 if (error == 0 && uiop->uio_resid == bp->b_bcount) 302 bp->b_flags |= B_INVAL; 303 break; 304 */ 305 default: 306 printf("nwfs_doio: type %x unexpected\n",vp->v_type); 307 break; 308 }; 309 if (error) { 310 bp->b_ioflags |= BIO_ERROR; 311 bp->b_error = error; 312 } 313 } else { /* write */ 314 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 315 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 316 317 if (bp->b_dirtyend > bp->b_dirtyoff) { 318 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 319 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 320 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 321 uiop->uio_rw = UIO_WRITE; 322 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 323 324 /* 325 * For an interrupted write, the buffer is still valid 326 * and the write hasn't been pushed to the server yet, 327 * so we can't set BIO_ERROR and report the interruption 328 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 329 * is not relevant, so the rpc attempt is essentially 330 * a noop. For the case of a V3 write rpc not being 331 * committed to stable storage, the block is still 332 * dirty and requires either a commit rpc or another 333 * write rpc with iomode == NFSV3WRITE_FILESYNC before 334 * the block is reused. This is indicated by setting 335 * the B_DELWRI and B_NEEDCOMMIT flags. 336 */ 337 if (error == EINTR 338 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 339 int s; 340 341 s = splbio(); 342 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 343 if ((bp->b_flags & B_ASYNC) == 0) 344 bp->b_flags |= B_EINTR; 345 if ((bp->b_flags & B_PAGING) == 0) { 346 bdirty(bp); 347 bp->b_flags &= ~B_DONE; 348 } 349 if ((bp->b_flags & B_ASYNC) == 0) 350 bp->b_flags |= B_EINTR; 351 splx(s); 352 } else { 353 if (error) { 354 bp->b_ioflags |= BIO_ERROR; 355 bp->b_error /*= np->n_error */= error; 356 /* np->n_flag |= NWRITEERR;*/ 357 } 358 bp->b_dirtyoff = bp->b_dirtyend = 0; 359 } 360 } else { 361 bp->b_resid = 0; 362 bufdone(bp); 363 return (0); 364 } 365 } 366 bp->b_resid = uiop->uio_resid; 367 bufdone(bp); 368 return (error); 369 } 370 371 /* 372 * Vnode op for VM getpages. 373 * Wish wish .... get rid from multiple IO routines 374 */ 375 int 376 nwfs_getpages(ap) 377 struct vop_getpages_args /* { 378 struct vnode *a_vp; 379 vm_page_t *a_m; 380 int a_count; 381 int a_reqpage; 382 vm_ooffset_t a_offset; 383 } */ *ap; 384 { 385 #ifndef NWFS_RWCACHE 386 return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count, 387 #else 388 int i, error, nextoff, size, toff, npages, count; 389 struct uio uio; 390 struct iovec iov; 391 vm_offset_t kva; 392 struct buf *bp; 393 struct vnode *vp; 394 struct thread *td; 395 struct ucred *cred; 396 struct nwmount *nmp; 397 struct nwnode *np; 398 vm_object_t object; 399 vm_page_t *pages; 400 401 vp = ap->a_vp; 402 td = curthread; /* XXX */ 403 cred = td->td_ucred; /* XXX */ 404 np = VTONW(vp); 405 nmp = VFSTONWFS(vp->v_mount); 406 pages = ap->a_m; 407 count = ap->a_count; 408 409 if ((object = vp->v_object) == NULL) { 410 printf("nwfs_getpages: called with non-merged cache vnode??\n"); 411 return VM_PAGER_ERROR; 412 } 413 414 bp = getpbuf(&nwfs_pbuf_freecnt); 415 npages = btoc(count); 416 kva = (vm_offset_t) bp->b_data; 417 pmap_qenter(kva, pages, npages); 418 419 iov.iov_base = (caddr_t) kva; 420 iov.iov_len = count; 421 uio.uio_iov = &iov; 422 uio.uio_iovcnt = 1; 423 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 424 uio.uio_resid = count; 425 uio.uio_segflg = UIO_SYSSPACE; 426 uio.uio_rw = UIO_READ; 427 uio.uio_td = td; 428 429 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred); 430 pmap_qremove(kva, npages); 431 432 relpbuf(bp, &nwfs_pbuf_freecnt); 433 434 VM_OBJECT_LOCK(object); 435 if (error && (uio.uio_resid == count)) { 436 printf("nwfs_getpages: error %d\n",error); 437 vm_page_lock_queues(); 438 for (i = 0; i < npages; i++) { 439 if (ap->a_reqpage != i) 440 vm_page_free(pages[i]); 441 } 442 vm_page_unlock_queues(); 443 VM_OBJECT_UNLOCK(object); 444 return VM_PAGER_ERROR; 445 } 446 447 size = count - uio.uio_resid; 448 449 vm_page_lock_queues(); 450 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 451 vm_page_t m; 452 nextoff = toff + PAGE_SIZE; 453 m = pages[i]; 454 455 if (nextoff <= size) { 456 m->valid = VM_PAGE_BITS_ALL; 457 KASSERT(m->dirty == 0, 458 ("nwfs_getpages: page %p is dirty", m)); 459 } else { 460 int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1); 461 vm_page_set_valid(m, 0, nvalid); 462 KASSERT((m->dirty & vm_page_bits(0, nvalid)) == 0, 463 ("nwfs_getpages: page %p is dirty", m)); 464 } 465 466 if (i != ap->a_reqpage) { 467 /* 468 * Whether or not to leave the page activated is up in 469 * the air, but we should put the page on a page queue 470 * somewhere (it already is in the object). Result: 471 * It appears that emperical results show that 472 * deactivating pages is best. 473 */ 474 475 /* 476 * Just in case someone was asking for this page we 477 * now tell them that it is ok to use. 478 */ 479 if (!error) { 480 if (m->oflags & VPO_WANTED) 481 vm_page_activate(m); 482 else 483 vm_page_deactivate(m); 484 vm_page_wakeup(m); 485 } else { 486 vm_page_free(m); 487 } 488 } 489 } 490 vm_page_unlock_queues(); 491 VM_OBJECT_UNLOCK(object); 492 return 0; 493 #endif /* NWFS_RWCACHE */ 494 } 495 496 /* 497 * Vnode op for VM putpages. 498 * possible bug: all IO done in sync mode 499 * Note that vop_close always invalidate pages before close, so it's 500 * not necessary to open vnode. 501 */ 502 int 503 nwfs_putpages(ap) 504 struct vop_putpages_args /* { 505 struct vnode *a_vp; 506 vm_page_t *a_m; 507 int a_count; 508 int a_sync; 509 int *a_rtvals; 510 vm_ooffset_t a_offset; 511 } */ *ap; 512 { 513 int error; 514 struct vnode *vp = ap->a_vp; 515 struct thread *td; 516 struct ucred *cred; 517 518 #ifndef NWFS_RWCACHE 519 td = curthread; /* XXX */ 520 cred = td->td_ucred; /* XXX */ 521 VOP_OPEN(vp, FWRITE, cred, td, NULL); 522 error = vop_stdputpages(ap); 523 VOP_CLOSE(vp, FWRITE, cred, td); 524 return error; 525 #else 526 struct uio uio; 527 struct iovec iov; 528 vm_offset_t kva; 529 struct buf *bp; 530 int i, npages, count; 531 int *rtvals; 532 struct nwmount *nmp; 533 struct nwnode *np; 534 vm_page_t *pages; 535 536 td = curthread; /* XXX */ 537 cred = td->td_ucred; /* XXX */ 538 /* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 539 np = VTONW(vp); 540 nmp = VFSTONWFS(vp->v_mount); 541 pages = ap->a_m; 542 count = ap->a_count; 543 rtvals = ap->a_rtvals; 544 npages = btoc(count); 545 546 for (i = 0; i < npages; i++) { 547 rtvals[i] = VM_PAGER_ERROR; 548 } 549 550 bp = getpbuf(&nwfs_pbuf_freecnt); 551 kva = (vm_offset_t) bp->b_data; 552 pmap_qenter(kva, pages, npages); 553 554 iov.iov_base = (caddr_t) kva; 555 iov.iov_len = count; 556 uio.uio_iov = &iov; 557 uio.uio_iovcnt = 1; 558 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 559 uio.uio_resid = count; 560 uio.uio_segflg = UIO_SYSSPACE; 561 uio.uio_rw = UIO_WRITE; 562 uio.uio_td = td; 563 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 564 565 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred); 566 /* VOP_CLOSE(vp, FWRITE, cred, td);*/ 567 NCPVNDEBUG("paged write done: %d\n", error); 568 569 pmap_qremove(kva, npages); 570 relpbuf(bp, &nwfs_pbuf_freecnt); 571 572 if (!error) 573 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid); 574 return rtvals[0]; 575 #endif /* NWFS_RWCACHE */ 576 } 577 /* 578 * Flush and invalidate all dirty buffers. If another process is already 579 * doing the flush, just wait for completion. 580 */ 581 int 582 nwfs_vinvalbuf(vp, td) 583 struct vnode *vp; 584 struct thread *td; 585 { 586 struct nwnode *np = VTONW(vp); 587 /* struct nwmount *nmp = VTONWFS(vp);*/ 588 int error = 0; 589 590 if (vp->v_iflag & VI_DOOMED) 591 return (0); 592 593 while (np->n_flag & NFLUSHINPROG) { 594 np->n_flag |= NFLUSHWANT; 595 error = tsleep(&np->n_flag, PRIBIO + 2, "nwfsvinv", 2 * hz); 596 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), td); 597 if (error == EINTR) 598 return EINTR; 599 } 600 np->n_flag |= NFLUSHINPROG; 601 602 if (vp->v_bufobj.bo_object != NULL) { 603 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 604 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 605 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 606 } 607 608 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 609 while (error) { 610 if (error == ERESTART || error == EINTR) { 611 np->n_flag &= ~NFLUSHINPROG; 612 if (np->n_flag & NFLUSHWANT) { 613 np->n_flag &= ~NFLUSHWANT; 614 wakeup(&np->n_flag); 615 } 616 return EINTR; 617 } 618 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 619 } 620 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 621 if (np->n_flag & NFLUSHWANT) { 622 np->n_flag &= ~NFLUSHWANT; 623 wakeup(&np->n_flag); 624 } 625 return (error); 626 }
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