FreeBSD/Linux Kernel Cross Reference
sys/fs/nwfs/nwfs_io.c
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: releng/6.0/sys/fs/nwfs/nwfs_io.c 143513 2005-03-13 12:18:25Z jeff $
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/bio.h>
40 #include <sys/buf.h>
41 #include <sys/proc.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/vnode.h>
45 #include <sys/dirent.h>
46 #include <sys/signalvar.h>
47 #include <sys/sysctl.h>
48
49 #include <vm/vm.h>
50 #include <vm/vm_page.h>
51 #include <vm/vm_extern.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_pager.h>
54 #include <vm/vnode_pager.h>
55
56 #include <netncp/ncp.h>
57 #include <netncp/ncp_conn.h>
58 #include <netncp/ncp_subr.h>
59 #include <netncp/ncp_ncp.h>
60
61 #include <fs/nwfs/nwfs.h>
62 #include <fs/nwfs/nwfs_node.h>
63 #include <fs/nwfs/nwfs_subr.h>
64
65 static int nwfs_fastlookup = 1;
66
67 SYSCTL_DECL(_vfs_nwfs);
68 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, "");
69
70
71 extern int nwfs_pbuf_freecnt;
72
73 #define DE_SIZE (sizeof(struct dirent))
74 #define NWFS_RWCACHE
75
76 static int
77 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
78 struct nwmount *nmp = VTONWFS(vp);
79 int error, count, i;
80 struct dirent dp;
81 struct nwnode *np = VTONW(vp);
82 struct nw_entry_info fattr;
83 struct vnode *newvp;
84 struct componentname cn;
85 ncpfid fid;
86
87 np = VTONW(vp);
88 NCPVNDEBUG("dirname='%s'\n",np->n_name);
89 if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0))
90 return (EINVAL);
91 error = 0;
92 count = 0;
93 i = uio->uio_offset / DE_SIZE; /* offset in directory */
94 if (i == 0) {
95 error = ncp_initsearch(vp, uio->uio_td, cred);
96 if (error) {
97 NCPVNDEBUG("cannot initialize search, error=%d",error);
98 return( error );
99 }
100 }
101
102 for (; uio->uio_resid >= DE_SIZE; i++) {
103 bzero((char *) &dp, DE_SIZE);
104 dp.d_reclen = DE_SIZE;
105 switch (i) {
106 case 0: /* `.' */
107 case 1: /* `..' */
108 dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id;
109 if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO;
110 dp.d_namlen = i + 1;
111 dp.d_name[0] = '.';
112 dp.d_name[1] = '.';
113 dp.d_name[i + 1] = '\0';
114 dp.d_type = DT_DIR;
115 break;
116 default:
117 error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred);
118 if (error && error < 0x80) break;
119 dp.d_fileno = fattr.dirEntNum;
120 dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG;
121 dp.d_namlen = fattr.nameLen;
122 bcopy(fattr.entryName, dp.d_name, dp.d_namlen);
123 dp.d_name[dp.d_namlen] = '\0';
124 #if 0
125 if (error && eofflag) {
126 /* *eofflag = 1;*/
127 break;
128 }
129 #endif
130 break;
131 }
132 if (nwfs_fastlookup && !error && i > 1) {
133 fid.f_id = fattr.dirEntNum;
134 fid.f_parent = np->n_fid.f_id;
135 error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp);
136 if (!error) {
137 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
138 cn.cn_nameptr = dp.d_name;
139 cn.cn_namelen = dp.d_namlen;
140 cache_enter(vp, newvp, &cn);
141 vput(newvp);
142 } else
143 error = 0;
144 }
145 if (error >= 0x80) {
146 error = 0;
147 break;
148 }
149 if ((error = uiomove(&dp, DE_SIZE, uio)))
150 break;
151 }
152
153 uio->uio_offset = i * DE_SIZE;
154 return (error);
155 }
156
157 int
158 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) {
159 struct nwmount *nmp = VFSTONWFS(vp->v_mount);
160 struct nwnode *np = VTONW(vp);
161 struct thread *td;
162 struct vattr vattr;
163 int error, biosize;
164
165 if (vp->v_type != VREG && vp->v_type != VDIR) {
166 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__);
167 return EIO;
168 }
169 if (uiop->uio_resid == 0) return 0;
170 if (uiop->uio_offset < 0) return EINVAL;
171 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
172 return (EFBIG);*/
173 td = uiop->uio_td;
174 if (vp->v_type == VDIR) {
175 error = nwfs_readvdir(vp, uiop, cred);
176 return error;
177 }
178 biosize = NWFSTOCONN(nmp)->buffer_size;
179 if (np->n_flag & NMODIFIED) {
180 nwfs_attr_cacheremove(vp);
181 error = VOP_GETATTR(vp, &vattr, cred, td);
182 if (error) return (error);
183 np->n_mtime = vattr.va_mtime.tv_sec;
184 } else {
185 error = VOP_GETATTR(vp, &vattr, cred, td);
186 if (error) return (error);
187 if (np->n_mtime != vattr.va_mtime.tv_sec) {
188 error = nwfs_vinvalbuf(vp, td);
189 if (error) return (error);
190 np->n_mtime = vattr.va_mtime.tv_sec;
191 }
192 }
193 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
194 return (error);
195 }
196
197 int
198 nwfs_writevnode(vp, uiop, cred, ioflag)
199 struct vnode *vp;
200 struct uio *uiop;
201 struct ucred *cred;
202 int ioflag;
203 {
204 struct nwmount *nmp = VTONWFS(vp);
205 struct nwnode *np = VTONW(vp);
206 struct thread *td;
207 /* struct vattr vattr;*/
208 int error = 0;
209
210 if (vp->v_type != VREG) {
211 printf("%s: vn types other than VREG unsupported !\n",__func__);
212 return EIO;
213 }
214 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
215 if (uiop->uio_offset < 0) return EINVAL;
216 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
217 return (EFBIG);*/
218 td = uiop->uio_td;
219 if (ioflag & (IO_APPEND | IO_SYNC)) {
220 if (np->n_flag & NMODIFIED) {
221 nwfs_attr_cacheremove(vp);
222 error = nwfs_vinvalbuf(vp, td);
223 if (error) return (error);
224 }
225 if (ioflag & IO_APPEND) {
226 /* We can relay only on local information about file size,
227 * because until file is closed NetWare will not return
228 * the correct size. */
229 #if notyet
230 nwfs_attr_cacheremove(vp);
231 error = VOP_GETATTR(vp, &vattr, cred, td);
232 if (error) return (error);
233 #endif
234 uiop->uio_offset = np->n_size;
235 }
236 }
237 if (uiop->uio_resid == 0) return 0;
238 if (td != NULL) {
239 PROC_LOCK(td->td_proc);
240 if (uiop->uio_offset + uiop->uio_resid >
241 lim_cur(td->td_proc, RLIMIT_FSIZE)) {
242 psignal(td->td_proc, SIGXFSZ);
243 PROC_UNLOCK(td->td_proc);
244 return (EFBIG);
245 }
246 PROC_UNLOCK(td->td_proc);
247 }
248 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
249 NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
250 if (!error) {
251 if (uiop->uio_offset > np->n_size) {
252 np->n_vattr.va_size = np->n_size = uiop->uio_offset;
253 vnode_pager_setsize(vp, np->n_size);
254 }
255 }
256 return (error);
257 }
258
259 /*
260 * Do an I/O operation to/from a cache block.
261 */
262 int
263 nwfs_doio(vp, bp, cr, td)
264 struct vnode *vp;
265 struct buf *bp;
266 struct ucred *cr;
267 struct thread *td;
268 {
269 struct uio *uiop;
270 struct nwnode *np;
271 struct nwmount *nmp;
272 int error = 0;
273 struct uio uio;
274 struct iovec io;
275
276 np = VTONW(vp);
277 nmp = VFSTONWFS(vp->v_mount);
278 uiop = &uio;
279 uiop->uio_iov = &io;
280 uiop->uio_iovcnt = 1;
281 uiop->uio_segflg = UIO_SYSSPACE;
282 uiop->uio_td = td;
283 if (bp->b_iocmd == BIO_READ) {
284 io.iov_len = uiop->uio_resid = bp->b_bcount;
285 io.iov_base = bp->b_data;
286 uiop->uio_rw = UIO_READ;
287 switch (vp->v_type) {
288 case VREG:
289 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
290 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
291 if (error)
292 break;
293 if (uiop->uio_resid) {
294 int left = uiop->uio_resid;
295 int nread = bp->b_bcount - left;
296 if (left > 0)
297 bzero((char *)bp->b_data + nread, left);
298 }
299 break;
300 /* case VDIR:
301 nfsstats.readdir_bios++;
302 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
303 if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
304 error = nfs_readdirplusrpc(vp, uiop, cr);
305 if (error == NFSERR_NOTSUPP)
306 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
307 }
308 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
309 error = nfs_readdirrpc(vp, uiop, cr);
310 if (error == 0 && uiop->uio_resid == bp->b_bcount)
311 bp->b_flags |= B_INVAL;
312 break;
313 */
314 default:
315 printf("nwfs_doio: type %x unexpected\n",vp->v_type);
316 break;
317 };
318 if (error) {
319 bp->b_ioflags |= BIO_ERROR;
320 bp->b_error = error;
321 }
322 } else { /* write */
323 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
324 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
325
326 if (bp->b_dirtyend > bp->b_dirtyoff) {
327 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
328 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
329 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
330 uiop->uio_rw = UIO_WRITE;
331 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
332
333 /*
334 * For an interrupted write, the buffer is still valid
335 * and the write hasn't been pushed to the server yet,
336 * so we can't set BIO_ERROR and report the interruption
337 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
338 * is not relevant, so the rpc attempt is essentially
339 * a noop. For the case of a V3 write rpc not being
340 * committed to stable storage, the block is still
341 * dirty and requires either a commit rpc or another
342 * write rpc with iomode == NFSV3WRITE_FILESYNC before
343 * the block is reused. This is indicated by setting
344 * the B_DELWRI and B_NEEDCOMMIT flags.
345 */
346 if (error == EINTR
347 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
348 int s;
349
350 s = splbio();
351 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
352 if ((bp->b_flags & B_ASYNC) == 0)
353 bp->b_flags |= B_EINTR;
354 if ((bp->b_flags & B_PAGING) == 0) {
355 bdirty(bp);
356 bp->b_flags &= ~B_DONE;
357 }
358 if ((bp->b_flags & B_ASYNC) == 0)
359 bp->b_flags |= B_EINTR;
360 splx(s);
361 } else {
362 if (error) {
363 bp->b_ioflags |= BIO_ERROR;
364 bp->b_error /*= np->n_error */= error;
365 /* np->n_flag |= NWRITEERR;*/
366 }
367 bp->b_dirtyoff = bp->b_dirtyend = 0;
368 }
369 } else {
370 bp->b_resid = 0;
371 bufdone(bp);
372 return (0);
373 }
374 }
375 bp->b_resid = uiop->uio_resid;
376 bufdone(bp);
377 return (error);
378 }
379
380 /*
381 * Vnode op for VM getpages.
382 * Wish wish .... get rid from multiple IO routines
383 */
384 int
385 nwfs_getpages(ap)
386 struct vop_getpages_args /* {
387 struct vnode *a_vp;
388 vm_page_t *a_m;
389 int a_count;
390 int a_reqpage;
391 vm_ooffset_t a_offset;
392 } */ *ap;
393 {
394 #ifndef NWFS_RWCACHE
395 return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count,
396 #else
397 int i, error, nextoff, size, toff, npages, count;
398 struct uio uio;
399 struct iovec iov;
400 vm_offset_t kva;
401 struct buf *bp;
402 struct vnode *vp;
403 struct thread *td;
404 struct ucred *cred;
405 struct nwmount *nmp;
406 struct nwnode *np;
407 vm_object_t object;
408 vm_page_t *pages;
409
410 vp = ap->a_vp;
411 td = curthread; /* XXX */
412 cred = td->td_ucred; /* XXX */
413 np = VTONW(vp);
414 nmp = VFSTONWFS(vp->v_mount);
415 pages = ap->a_m;
416 count = ap->a_count;
417
418 if ((object = vp->v_object) == NULL) {
419 printf("nwfs_getpages: called with non-merged cache vnode??\n");
420 return VM_PAGER_ERROR;
421 }
422
423 bp = getpbuf(&nwfs_pbuf_freecnt);
424 npages = btoc(count);
425 kva = (vm_offset_t) bp->b_data;
426 pmap_qenter(kva, pages, npages);
427
428 iov.iov_base = (caddr_t) kva;
429 iov.iov_len = count;
430 uio.uio_iov = &iov;
431 uio.uio_iovcnt = 1;
432 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
433 uio.uio_resid = count;
434 uio.uio_segflg = UIO_SYSSPACE;
435 uio.uio_rw = UIO_READ;
436 uio.uio_td = td;
437
438 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
439 pmap_qremove(kva, npages);
440
441 relpbuf(bp, &nwfs_pbuf_freecnt);
442
443 VM_OBJECT_LOCK(object);
444 if (error && (uio.uio_resid == count)) {
445 printf("nwfs_getpages: error %d\n",error);
446 vm_page_lock_queues();
447 for (i = 0; i < npages; i++) {
448 if (ap->a_reqpage != i)
449 vm_page_free(pages[i]);
450 }
451 vm_page_unlock_queues();
452 VM_OBJECT_UNLOCK(object);
453 return VM_PAGER_ERROR;
454 }
455
456 size = count - uio.uio_resid;
457
458 vm_page_lock_queues();
459 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
460 vm_page_t m;
461 nextoff = toff + PAGE_SIZE;
462 m = pages[i];
463
464 if (nextoff <= size) {
465 m->valid = VM_PAGE_BITS_ALL;
466 m->dirty = 0;
467 } else {
468 int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
469 vm_page_set_validclean(m, 0, nvalid);
470 }
471
472 if (i != ap->a_reqpage) {
473 /*
474 * Whether or not to leave the page activated is up in
475 * the air, but we should put the page on a page queue
476 * somewhere (it already is in the object). Result:
477 * It appears that emperical results show that
478 * deactivating pages is best.
479 */
480
481 /*
482 * Just in case someone was asking for this page we
483 * now tell them that it is ok to use.
484 */
485 if (!error) {
486 if (m->flags & PG_WANTED)
487 vm_page_activate(m);
488 else
489 vm_page_deactivate(m);
490 vm_page_wakeup(m);
491 } else {
492 vm_page_free(m);
493 }
494 }
495 }
496 vm_page_unlock_queues();
497 VM_OBJECT_UNLOCK(object);
498 return 0;
499 #endif /* NWFS_RWCACHE */
500 }
501
502 /*
503 * Vnode op for VM putpages.
504 * possible bug: all IO done in sync mode
505 * Note that vop_close always invalidate pages before close, so it's
506 * not necessary to open vnode.
507 */
508 int
509 nwfs_putpages(ap)
510 struct vop_putpages_args /* {
511 struct vnode *a_vp;
512 vm_page_t *a_m;
513 int a_count;
514 int a_sync;
515 int *a_rtvals;
516 vm_ooffset_t a_offset;
517 } */ *ap;
518 {
519 int error;
520 struct vnode *vp = ap->a_vp;
521 struct thread *td;
522 struct ucred *cred;
523
524 #ifndef NWFS_RWCACHE
525 td = curthread; /* XXX */
526 cred = td->td_ucred; /* XXX */
527 VOP_OPEN(vp, FWRITE, cred, td, -1);
528 error = vop_stdputpages(ap);
529 VOP_CLOSE(vp, FWRITE, cred, td);
530 return error;
531 #else
532 struct uio uio;
533 struct iovec iov;
534 vm_offset_t kva;
535 struct buf *bp;
536 int i, npages, count;
537 int *rtvals;
538 struct nwmount *nmp;
539 struct nwnode *np;
540 vm_page_t *pages;
541
542 td = curthread; /* XXX */
543 cred = td->td_ucred; /* XXX */
544 /* VOP_OPEN(vp, FWRITE, cred, td, -1);*/
545 np = VTONW(vp);
546 nmp = VFSTONWFS(vp->v_mount);
547 pages = ap->a_m;
548 count = ap->a_count;
549 rtvals = ap->a_rtvals;
550 npages = btoc(count);
551
552 for (i = 0; i < npages; i++) {
553 rtvals[i] = VM_PAGER_AGAIN;
554 }
555
556 bp = getpbuf(&nwfs_pbuf_freecnt);
557 kva = (vm_offset_t) bp->b_data;
558 pmap_qenter(kva, pages, npages);
559
560 iov.iov_base = (caddr_t) kva;
561 iov.iov_len = count;
562 uio.uio_iov = &iov;
563 uio.uio_iovcnt = 1;
564 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
565 uio.uio_resid = count;
566 uio.uio_segflg = UIO_SYSSPACE;
567 uio.uio_rw = UIO_WRITE;
568 uio.uio_td = td;
569 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
570
571 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
572 /* VOP_CLOSE(vp, FWRITE, cred, td);*/
573 NCPVNDEBUG("paged write done: %d\n", error);
574
575 pmap_qremove(kva, npages);
576 relpbuf(bp, &nwfs_pbuf_freecnt);
577
578 if (!error) {
579 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
580 vm_page_lock_queues();
581 for (i = 0; i < nwritten; i++) {
582 rtvals[i] = VM_PAGER_OK;
583 vm_page_undirty(pages[i]);
584 }
585 vm_page_unlock_queues();
586 }
587 return rtvals[0];
588 #endif /* NWFS_RWCACHE */
589 }
590 /*
591 * Flush and invalidate all dirty buffers. If another process is already
592 * doing the flush, just wait for completion.
593 */
594 int
595 nwfs_vinvalbuf(vp, td)
596 struct vnode *vp;
597 struct thread *td;
598 {
599 struct nwnode *np = VTONW(vp);
600 /* struct nwmount *nmp = VTONWFS(vp);*/
601 int error = 0;
602
603 if (vp->v_iflag & VI_DOOMED)
604 return (0);
605
606 while (np->n_flag & NFLUSHINPROG) {
607 np->n_flag |= NFLUSHWANT;
608 error = tsleep(&np->n_flag, PRIBIO + 2, "nwfsvinv", 2 * hz);
609 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), td);
610 if (error == EINTR)
611 return EINTR;
612 }
613 np->n_flag |= NFLUSHINPROG;
614 error = vinvalbuf(vp, V_SAVE, td, PCATCH, 0);
615 while (error) {
616 if (error == ERESTART || error == EINTR) {
617 np->n_flag &= ~NFLUSHINPROG;
618 if (np->n_flag & NFLUSHWANT) {
619 np->n_flag &= ~NFLUSHWANT;
620 wakeup(&np->n_flag);
621 }
622 return EINTR;
623 }
624 error = vinvalbuf(vp, V_SAVE, td, PCATCH, 0);
625 }
626 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
627 if (np->n_flag & NFLUSHWANT) {
628 np->n_flag &= ~NFLUSHWANT;
629 wakeup(&np->n_flag);
630 }
631 return (error);
632 }
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