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 * 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: releng/9.0/sys/fs/nwfs/nwfs_io.c 222586 2011-06-01 21:00:28Z kib $ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/bio.h> 33 #include <sys/buf.h> 34 #include <sys/mount.h> 35 #include <sys/namei.h> 36 #include <sys/vnode.h> 37 #include <sys/dirent.h> 38 #include <sys/sysctl.h> 39 40 #include <vm/vm.h> 41 #include <vm/vm_page.h> 42 #include <vm/vm_extern.h> 43 #include <vm/vm_object.h> 44 #include <vm/vm_pager.h> 45 #include <vm/vnode_pager.h> 46 47 #include <netncp/ncp.h> 48 #include <netncp/ncp_conn.h> 49 #include <netncp/ncp_subr.h> 50 #include <netncp/ncp_ncp.h> 51 52 #include <fs/nwfs/nwfs.h> 53 #include <fs/nwfs/nwfs_node.h> 54 #include <fs/nwfs/nwfs_subr.h> 55 56 static int nwfs_fastlookup = 1; 57 58 SYSCTL_DECL(_vfs_nwfs); 59 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, ""); 60 61 62 extern int nwfs_pbuf_freecnt; 63 64 #define DE_SIZE (sizeof(struct dirent)) 65 #define NWFS_RWCACHE 66 67 static int 68 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) { 69 struct nwmount *nmp = VTONWFS(vp); 70 int error, count, i; 71 struct dirent dp; 72 struct nwnode *np = VTONW(vp); 73 struct nw_entry_info fattr; 74 struct vnode *newvp; 75 struct componentname cn; 76 ncpfid fid; 77 78 np = VTONW(vp); 79 NCPVNDEBUG("dirname='%s'\n",np->n_name); 80 if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0)) 81 return (EINVAL); 82 error = 0; 83 count = 0; 84 i = uio->uio_offset / DE_SIZE; /* offset in directory */ 85 if (i == 0) { 86 error = ncp_initsearch(vp, uio->uio_td, cred); 87 if (error) { 88 NCPVNDEBUG("cannot initialize search, error=%d",error); 89 return( error ); 90 } 91 } 92 93 for (; uio->uio_resid >= DE_SIZE; i++) { 94 bzero((char *) &dp, DE_SIZE); 95 dp.d_reclen = DE_SIZE; 96 switch (i) { 97 case 0: /* `.' */ 98 case 1: /* `..' */ 99 dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id; 100 if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO; 101 dp.d_namlen = i + 1; 102 dp.d_name[0] = '.'; 103 dp.d_name[1] = '.'; 104 dp.d_name[i + 1] = '\0'; 105 dp.d_type = DT_DIR; 106 break; 107 default: 108 error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred); 109 if (error && error < 0x80) break; 110 dp.d_fileno = fattr.dirEntNum; 111 dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG; 112 dp.d_namlen = fattr.nameLen; 113 bcopy(fattr.entryName, dp.d_name, dp.d_namlen); 114 dp.d_name[dp.d_namlen] = '\0'; 115 #if 0 116 if (error && eofflag) { 117 /* *eofflag = 1;*/ 118 break; 119 } 120 #endif 121 break; 122 } 123 if (nwfs_fastlookup && !error && i > 1) { 124 fid.f_id = fattr.dirEntNum; 125 fid.f_parent = np->n_fid.f_id; 126 error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp); 127 if (!error) { 128 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec; 129 cn.cn_nameptr = dp.d_name; 130 cn.cn_namelen = dp.d_namlen; 131 cache_enter(vp, newvp, &cn); 132 vput(newvp); 133 } else 134 error = 0; 135 } 136 if (error >= 0x80) { 137 error = 0; 138 break; 139 } 140 if ((error = uiomove(&dp, DE_SIZE, uio))) 141 break; 142 } 143 144 uio->uio_offset = i * DE_SIZE; 145 return (error); 146 } 147 148 int 149 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) { 150 struct nwmount *nmp = VFSTONWFS(vp->v_mount); 151 struct nwnode *np = VTONW(vp); 152 struct thread *td; 153 struct vattr vattr; 154 int error, biosize; 155 156 if (vp->v_type != VREG && vp->v_type != VDIR) { 157 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__); 158 return EIO; 159 } 160 if (uiop->uio_resid == 0) return 0; 161 if (uiop->uio_offset < 0) return EINVAL; 162 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 163 return (EFBIG);*/ 164 td = uiop->uio_td; 165 if (vp->v_type == VDIR) { 166 error = nwfs_readvdir(vp, uiop, cred); 167 return error; 168 } 169 biosize = NWFSTOCONN(nmp)->buffer_size; 170 if (np->n_flag & NMODIFIED) { 171 nwfs_attr_cacheremove(vp); 172 error = VOP_GETATTR(vp, &vattr, cred); 173 if (error) return (error); 174 np->n_mtime = vattr.va_mtime.tv_sec; 175 } else { 176 error = VOP_GETATTR(vp, &vattr, cred); 177 if (error) return (error); 178 if (np->n_mtime != vattr.va_mtime.tv_sec) { 179 error = nwfs_vinvalbuf(vp, td); 180 if (error) return (error); 181 np->n_mtime = vattr.va_mtime.tv_sec; 182 } 183 } 184 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 185 return (error); 186 } 187 188 int 189 nwfs_writevnode(vp, uiop, cred, ioflag) 190 struct vnode *vp; 191 struct uio *uiop; 192 struct ucred *cred; 193 int ioflag; 194 { 195 struct nwmount *nmp = VTONWFS(vp); 196 struct nwnode *np = VTONW(vp); 197 struct thread *td; 198 /* struct vattr vattr;*/ 199 int error = 0; 200 201 if (vp->v_type != VREG) { 202 printf("%s: vn types other than VREG unsupported !\n",__func__); 203 return EIO; 204 } 205 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 206 if (uiop->uio_offset < 0) return EINVAL; 207 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 208 return (EFBIG);*/ 209 td = uiop->uio_td; 210 if (ioflag & (IO_APPEND | IO_SYNC)) { 211 if (np->n_flag & NMODIFIED) { 212 nwfs_attr_cacheremove(vp); 213 error = nwfs_vinvalbuf(vp, td); 214 if (error) return (error); 215 } 216 if (ioflag & IO_APPEND) { 217 /* We can relay only on local information about file size, 218 * because until file is closed NetWare will not return 219 * the correct size. */ 220 #ifdef notyet 221 nwfs_attr_cacheremove(vp); 222 error = VOP_GETATTR(vp, &vattr, cred); 223 if (error) return (error); 224 #endif 225 uiop->uio_offset = np->n_size; 226 } 227 } 228 if (uiop->uio_resid == 0) return 0; 229 230 if (vn_rlimit_fsize(vp, uiop, td)) 231 return (EFBIG); 232 233 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 234 NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 235 if (!error) { 236 if (uiop->uio_offset > np->n_size) { 237 np->n_vattr.va_size = np->n_size = uiop->uio_offset; 238 vnode_pager_setsize(vp, np->n_size); 239 } 240 } 241 return (error); 242 } 243 244 /* 245 * Do an I/O operation to/from a cache block. 246 */ 247 int 248 nwfs_doio(vp, bp, cr, td) 249 struct vnode *vp; 250 struct buf *bp; 251 struct ucred *cr; 252 struct thread *td; 253 { 254 struct uio *uiop; 255 struct nwnode *np; 256 struct nwmount *nmp; 257 int error = 0; 258 struct uio uio; 259 struct iovec io; 260 261 np = VTONW(vp); 262 nmp = VFSTONWFS(vp->v_mount); 263 uiop = &uio; 264 uiop->uio_iov = &io; 265 uiop->uio_iovcnt = 1; 266 uiop->uio_segflg = UIO_SYSSPACE; 267 uiop->uio_td = td; 268 if (bp->b_iocmd == BIO_READ) { 269 io.iov_len = uiop->uio_resid = bp->b_bcount; 270 io.iov_base = bp->b_data; 271 uiop->uio_rw = UIO_READ; 272 switch (vp->v_type) { 273 case VREG: 274 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 275 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 276 if (error) 277 break; 278 if (uiop->uio_resid) { 279 int left = uiop->uio_resid; 280 int nread = bp->b_bcount - left; 281 if (left > 0) 282 bzero((char *)bp->b_data + nread, left); 283 } 284 break; 285 /* case VDIR: 286 nfsstats.readdir_bios++; 287 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ; 288 if (nmp->nm_flag & NFSMNT_RDIRPLUS) { 289 error = nfs_readdirplusrpc(vp, uiop, cr); 290 if (error == NFSERR_NOTSUPP) 291 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 292 } 293 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 294 error = nfs_readdirrpc(vp, uiop, cr); 295 if (error == 0 && uiop->uio_resid == bp->b_bcount) 296 bp->b_flags |= B_INVAL; 297 break; 298 */ 299 default: 300 printf("nwfs_doio: type %x unexpected\n",vp->v_type); 301 break; 302 }; 303 if (error) { 304 bp->b_ioflags |= BIO_ERROR; 305 bp->b_error = error; 306 } 307 } else { /* write */ 308 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 309 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 310 311 if (bp->b_dirtyend > bp->b_dirtyoff) { 312 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 313 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 314 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 315 uiop->uio_rw = UIO_WRITE; 316 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 317 318 /* 319 * For an interrupted write, the buffer is still valid 320 * and the write hasn't been pushed to the server yet, 321 * so we can't set BIO_ERROR and report the interruption 322 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 323 * is not relevant, so the rpc attempt is essentially 324 * a noop. For the case of a V3 write rpc not being 325 * committed to stable storage, the block is still 326 * dirty and requires either a commit rpc or another 327 * write rpc with iomode == NFSV3WRITE_FILESYNC before 328 * the block is reused. This is indicated by setting 329 * the B_DELWRI and B_NEEDCOMMIT flags. 330 */ 331 if (error == EINTR 332 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 333 int s; 334 335 s = splbio(); 336 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 337 if ((bp->b_flags & B_ASYNC) == 0) 338 bp->b_flags |= B_EINTR; 339 if ((bp->b_flags & B_PAGING) == 0) { 340 bdirty(bp); 341 bp->b_flags &= ~B_DONE; 342 } 343 if ((bp->b_flags & B_ASYNC) == 0) 344 bp->b_flags |= B_EINTR; 345 splx(s); 346 } else { 347 if (error) { 348 bp->b_ioflags |= BIO_ERROR; 349 bp->b_error /*= np->n_error */= error; 350 /* np->n_flag |= NWRITEERR;*/ 351 } 352 bp->b_dirtyoff = bp->b_dirtyend = 0; 353 } 354 } else { 355 bp->b_resid = 0; 356 bufdone(bp); 357 return (0); 358 } 359 } 360 bp->b_resid = uiop->uio_resid; 361 bufdone(bp); 362 return (error); 363 } 364 365 /* 366 * Vnode op for VM getpages. 367 * Wish wish .... get rid from multiple IO routines 368 */ 369 int 370 nwfs_getpages(ap) 371 struct vop_getpages_args /* { 372 struct vnode *a_vp; 373 vm_page_t *a_m; 374 int a_count; 375 int a_reqpage; 376 vm_ooffset_t a_offset; 377 } */ *ap; 378 { 379 #ifndef NWFS_RWCACHE 380 return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count, 381 #else 382 int i, error, nextoff, size, toff, npages, count; 383 struct uio uio; 384 struct iovec iov; 385 vm_offset_t kva; 386 struct buf *bp; 387 struct vnode *vp; 388 struct thread *td; 389 struct ucred *cred; 390 struct nwmount *nmp; 391 struct nwnode *np; 392 vm_object_t object; 393 vm_page_t *pages; 394 395 vp = ap->a_vp; 396 td = curthread; /* XXX */ 397 cred = td->td_ucred; /* XXX */ 398 np = VTONW(vp); 399 nmp = VFSTONWFS(vp->v_mount); 400 pages = ap->a_m; 401 count = ap->a_count; 402 403 if ((object = vp->v_object) == NULL) { 404 printf("nwfs_getpages: called with non-merged cache vnode??\n"); 405 return VM_PAGER_ERROR; 406 } 407 408 bp = getpbuf(&nwfs_pbuf_freecnt); 409 npages = btoc(count); 410 kva = (vm_offset_t) bp->b_data; 411 pmap_qenter(kva, pages, npages); 412 413 iov.iov_base = (caddr_t) kva; 414 iov.iov_len = count; 415 uio.uio_iov = &iov; 416 uio.uio_iovcnt = 1; 417 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 418 uio.uio_resid = count; 419 uio.uio_segflg = UIO_SYSSPACE; 420 uio.uio_rw = UIO_READ; 421 uio.uio_td = td; 422 423 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred); 424 pmap_qremove(kva, npages); 425 426 relpbuf(bp, &nwfs_pbuf_freecnt); 427 428 VM_OBJECT_LOCK(object); 429 if (error && (uio.uio_resid == count)) { 430 printf("nwfs_getpages: error %d\n",error); 431 for (i = 0; i < npages; i++) { 432 if (ap->a_reqpage != i) { 433 vm_page_lock(pages[i]); 434 vm_page_free(pages[i]); 435 vm_page_unlock(pages[i]); 436 } 437 } 438 VM_OBJECT_UNLOCK(object); 439 return VM_PAGER_ERROR; 440 } 441 442 size = count - uio.uio_resid; 443 444 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 445 vm_page_t m; 446 nextoff = toff + PAGE_SIZE; 447 m = pages[i]; 448 449 if (nextoff <= size) { 450 m->valid = VM_PAGE_BITS_ALL; 451 KASSERT(m->dirty == 0, 452 ("nwfs_getpages: page %p is dirty", m)); 453 } else { 454 int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1); 455 vm_page_set_valid(m, 0, nvalid); 456 KASSERT((m->dirty & vm_page_bits(0, nvalid)) == 0, 457 ("nwfs_getpages: page %p is dirty", m)); 458 } 459 460 if (i != ap->a_reqpage) { 461 /* 462 * Whether or not to leave the page activated is up in 463 * the air, but we should put the page on a page queue 464 * somewhere (it already is in the object). Result: 465 * It appears that emperical results show that 466 * deactivating pages is best. 467 */ 468 469 /* 470 * Just in case someone was asking for this page we 471 * now tell them that it is ok to use. 472 */ 473 if (!error) { 474 if (m->oflags & VPO_WANTED) { 475 vm_page_lock(m); 476 vm_page_activate(m); 477 vm_page_unlock(m); 478 } else { 479 vm_page_lock(m); 480 vm_page_deactivate(m); 481 vm_page_unlock(m); 482 } 483 vm_page_wakeup(m); 484 } else { 485 vm_page_lock(m); 486 vm_page_free(m); 487 vm_page_unlock(m); 488 } 489 } 490 } 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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