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/uio.h>
38 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */
39 #include <sys/kernel.h>
40 #include <sys/proc.h>
41 #include <sys/fcntl.h>
42 #include <sys/mount.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
smbfs_readvdir(struct vnode * vp,struct uio * uio,struct ucred * cred)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
smbfs_readvnode(struct vnode * vp,struct uio * uiop,struct ucred * cred)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
smbfs_writevnode(struct vnode * vp,struct uio * uiop,struct ucred * cred,int ioflag)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
smbfs_doio(struct vnode * vp,struct bio * bio,struct ucred * cr,struct thread * td)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
smbfs_getpages(struct vop_getpages_args * ap)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 /*
485 * NOTE: pmap dirty bit should have already been cleared.
486 * We do not clear it here.
487 */
488 if (nextoff <= size) {
489 m->valid = VM_PAGE_BITS_ALL;
490 m->dirty = 0;
491 } else {
492 int nvalid = rounddown2((size + DEV_BSIZE - 1) - toff,
493 DEV_BSIZE);
494 vm_page_set_validclean(m, 0, nvalid);
495 }
496
497 if (i != ap->a_reqpage) {
498 /*
499 * Whether or not to leave the page activated is up in
500 * the air, but we should put the page on a page queue
501 * somewhere (it already is in the object). Result:
502 * It appears that emperical results show that
503 * deactivating pages is best.
504 */
505
506 /*
507 * Just in case someone was asking for this page we
508 * now tell them that it is ok to use.
509 */
510 if (!error) {
511 if (m->flags & PG_REFERENCED)
512 vm_page_activate(m);
513 else
514 vm_page_deactivate(m);
515 vm_page_wakeup(m);
516 } else {
517 vnode_pager_freepage(m);
518 }
519 }
520 }
521 return 0;
522 #endif /* SMBFS_RWGENERIC */
523 }
524
525 /*
526 * Vnode op for VM putpages.
527 * possible bug: all IO done in sync mode
528 * Note that vop_close always invalidate pages before close, so it's
529 * not necessary to open vnode.
530 *
531 * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_flags,
532 * int *a_rtvals, vm_ooffset_t a_offset)
533 */
534 int
smbfs_putpages(struct vop_putpages_args * ap)535 smbfs_putpages(struct vop_putpages_args *ap)
536 {
537 int error;
538 struct vnode *vp = ap->a_vp;
539 struct thread *td = curthread; /* XXX */
540 struct ucred *cred;
541
542 #ifdef SMBFS_RWGENERIC
543 KKASSERT(td->td_proc);
544 cred = td->td_proc->p_ucred;
545 VOP_OPEN(vp, FWRITE, cred, NULL);
546 error = vop_stdputpages(ap);
547 VOP_CLOSE(vp, FWRITE, cred, NULL);
548 return error;
549 #else
550 struct uio uio;
551 struct iovec iov;
552 vm_offset_t kva;
553 struct buf *bp;
554 int i, npages, count;
555 int doclose;
556 int *rtvals;
557 struct smbmount *smp;
558 struct smbnode *np;
559 struct smb_cred scred;
560 vm_page_t *pages;
561
562 KKASSERT(td->td_proc);
563 cred = td->td_proc->p_ucred;
564 /* VOP_OPEN(vp, FWRITE, cred, NULL);*/
565 np = VTOSMB(vp);
566 smp = VFSTOSMBFS(vp->v_mount);
567 pages = ap->a_m;
568 count = ap->a_count;
569 rtvals = ap->a_rtvals;
570 npages = btoc(count);
571
572 for (i = 0; i < npages; i++) {
573 rtvals[i] = VM_PAGER_AGAIN;
574 }
575
576 bp = getpbuf_kva(&smbfs_pbuf_freecnt);
577 kva = (vm_offset_t) bp->b_data;
578 pmap_qenter(kva, pages, npages);
579
580 iov.iov_base = (caddr_t) kva;
581 iov.iov_len = count;
582 uio.uio_iov = &iov;
583 uio.uio_iovcnt = 1;
584 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
585 uio.uio_resid = count;
586 uio.uio_segflg = UIO_SYSSPACE;
587 uio.uio_rw = UIO_WRITE;
588 uio.uio_td = td;
589 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
590
591 smb_makescred(&scred, td, cred);
592
593 /*
594 * This is kinda nasty. Since smbfs is physically closing the
595 * fid on close(), we have to reopen it if necessary. There are
596 * other races here too, such as if another process opens the same
597 * file while we are blocked in read, or the file is open read-only
598 * XXX
599 */
600 error = 0;
601 doclose = 0;
602 if (np->n_opencount == 0) {
603 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
604 if (error == 0)
605 doclose = 1;
606 }
607 if (error == 0)
608 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
609 if (doclose)
610 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
611 /* VOP_CLOSE(vp, FWRITE, cred);*/
612 SMBVDEBUG("paged write done: %d\n", error);
613
614 pmap_qremove(kva, npages);
615 relpbuf(bp, &smbfs_pbuf_freecnt);
616
617 if (!error) {
618 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
619 for (i = 0; i < nwritten; i++) {
620 rtvals[i] = VM_PAGER_OK;
621 vm_page_undirty(pages[i]);
622 }
623 }
624 return rtvals[0];
625 #endif /* SMBFS_RWGENERIC */
626 }
627
628 /*
629 * Flush and invalidate all dirty buffers. If another process is already
630 * doing the flush, just wait for completion.
631 */
632 int
smbfs_vinvalbuf(struct vnode * vp,int flags,int intrflg)633 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
634 {
635 struct smbnode *np = VTOSMB(vp);
636 int error = 0, slpflag, slptimeo;
637
638 if (vp->v_flag & VRECLAIMED)
639 return 0;
640 if (intrflg) {
641 slpflag = PCATCH;
642 slptimeo = 2 * hz;
643 } else {
644 slpflag = 0;
645 slptimeo = 0;
646 }
647 while (np->n_flag & NFLUSHINPROG) {
648 np->n_flag |= NFLUSHWANT;
649 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo);
650 error = smb_proc_intr(curthread);
651 if (error == EINTR && intrflg)
652 return EINTR;
653 }
654 np->n_flag |= NFLUSHINPROG;
655 error = vinvalbuf(vp, flags, slpflag, 0);
656 while (error) {
657 if (intrflg && (error == ERESTART || error == EINTR)) {
658 np->n_flag &= ~NFLUSHINPROG;
659 if (np->n_flag & NFLUSHWANT) {
660 np->n_flag &= ~NFLUSHWANT;
661 wakeup((caddr_t)&np->n_flag);
662 }
663 return EINTR;
664 }
665 error = vinvalbuf(vp, flags, slpflag, 0);
666 }
667 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
668 if (np->n_flag & NFLUSHWANT) {
669 np->n_flag &= ~NFLUSHWANT;
670 wakeup((caddr_t)&np->n_flag);
671 }
672 return (error);
673 }
674