1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its 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 REGENTS 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 REGENTS 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 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/5.3/sys/nfsclient/nfs_subs.c 131551 2004-07-04 08:52:35Z phk $");
37
38 /*
39 * These functions support the macros and help fiddle mbuf chains for
40 * the nfs op functions. They do things like create the rpc header and
41 * copy data between mbuf chains and uio lists.
42 */
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/proc.h>
50 #include <sys/mount.h>
51 #include <sys/vnode.h>
52 #include <sys/namei.h>
53 #include <sys/mbuf.h>
54 #include <sys/socket.h>
55 #include <sys/stat.h>
56 #include <sys/malloc.h>
57 #include <sys/sysent.h>
58 #include <sys/syscall.h>
59 #include <sys/sysproto.h>
60
61 #include <vm/vm.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_extern.h>
64 #include <vm/uma.h>
65
66 #include <rpc/rpcclnt.h>
67
68 #include <nfs/rpcv2.h>
69 #include <nfs/nfsproto.h>
70 #include <nfsclient/nfs.h>
71 #include <nfsclient/nfsnode.h>
72 #include <nfs/xdr_subs.h>
73 #include <nfsclient/nfsm_subs.h>
74 #include <nfsclient/nfsmount.h>
75
76 #include <netinet/in.h>
77
78 /*
79 * Data items converted to xdr at startup, since they are constant
80 * This is kinda hokey, but may save a little time doing byte swaps
81 */
82 u_int32_t nfs_xdrneg1;
83 u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
84 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
85 u_int32_t nfs_true, nfs_false;
86
87 /* And other global data */
88 static u_int32_t nfs_xid = 0;
89 static enum vtype nv2tov_type[8]= {
90 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
91 };
92
93 int nfs_ticks;
94 int nfs_pbuf_freecnt = -1; /* start out unlimited */
95
96 struct nfs_reqq nfs_reqq;
97 struct nfs_bufq nfs_bufq;
98
99 static int nfs_prev_nfsclnt_sy_narg;
100 static sy_call_t *nfs_prev_nfsclnt_sy_call;
101
102 /*
103 * and the reverse mapping from generic to Version 2 procedure numbers
104 */
105 int nfsv2_procid[NFS_NPROCS] = {
106 NFSV2PROC_NULL,
107 NFSV2PROC_GETATTR,
108 NFSV2PROC_SETATTR,
109 NFSV2PROC_LOOKUP,
110 NFSV2PROC_NOOP,
111 NFSV2PROC_READLINK,
112 NFSV2PROC_READ,
113 NFSV2PROC_WRITE,
114 NFSV2PROC_CREATE,
115 NFSV2PROC_MKDIR,
116 NFSV2PROC_SYMLINK,
117 NFSV2PROC_CREATE,
118 NFSV2PROC_REMOVE,
119 NFSV2PROC_RMDIR,
120 NFSV2PROC_RENAME,
121 NFSV2PROC_LINK,
122 NFSV2PROC_READDIR,
123 NFSV2PROC_NOOP,
124 NFSV2PROC_STATFS,
125 NFSV2PROC_NOOP,
126 NFSV2PROC_NOOP,
127 NFSV2PROC_NOOP,
128 NFSV2PROC_NOOP,
129 };
130
131 LIST_HEAD(nfsnodehashhead, nfsnode);
132
133 /*
134 * Create the header for an rpc request packet
135 * The hsiz is the size of the rest of the nfs request header.
136 * (just used to decide if a cluster is a good idea)
137 */
138 struct mbuf *
139 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
140 {
141 struct mbuf *mb;
142
143 MGET(mb, M_TRYWAIT, MT_DATA);
144 if (hsiz >= MINCLSIZE)
145 MCLGET(mb, M_TRYWAIT);
146 mb->m_len = 0;
147 return (mb);
148 }
149
150 /*
151 * Build the RPC header and fill in the authorization info.
152 * The authorization string argument is only used when the credentials
153 * come from outside of the kernel.
154 * Returns the head of the mbuf list.
155 */
156 struct mbuf *
157 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type,
158 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp,
159 u_int32_t *xidp)
160 {
161 struct mbuf *mb;
162 u_int32_t *tl;
163 caddr_t bpos;
164 int i;
165 struct mbuf *mreq;
166 int grpsiz, authsiz;
167
168 authsiz = nfsm_rndup(auth_len);
169 MGETHDR(mb, M_TRYWAIT, MT_DATA);
170 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
171 MCLGET(mb, M_TRYWAIT);
172 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
173 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
174 } else {
175 MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
176 }
177 mb->m_len = 0;
178 mreq = mb;
179 bpos = mtod(mb, caddr_t);
180
181 /*
182 * First the RPC header.
183 */
184 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED);
185
186 /* Get a pretty random xid to start with */
187 if (!nfs_xid)
188 nfs_xid = random();
189 /*
190 * Skip zero xid if it should ever happen.
191 */
192 if (++nfs_xid == 0)
193 nfs_xid++;
194
195 *tl++ = *xidp = txdr_unsigned(nfs_xid);
196 *tl++ = rpc_call;
197 *tl++ = rpc_vers;
198 *tl++ = txdr_unsigned(NFS_PROG);
199 if (nmflag & NFSMNT_NFSV3) {
200 *tl++ = txdr_unsigned(NFS_VER3);
201 *tl++ = txdr_unsigned(procid);
202 } else {
203 *tl++ = txdr_unsigned(NFS_VER2);
204 *tl++ = txdr_unsigned(nfsv2_procid[procid]);
205 }
206
207 /*
208 * And then the authorization cred.
209 */
210 *tl++ = txdr_unsigned(auth_type);
211 *tl = txdr_unsigned(authsiz);
212 switch (auth_type) {
213 case RPCAUTH_UNIX:
214 tl = nfsm_build(u_int32_t *, auth_len);
215 *tl++ = 0; /* stamp ?? */
216 *tl++ = 0; /* NULL hostname */
217 *tl++ = txdr_unsigned(cr->cr_uid);
218 *tl++ = txdr_unsigned(cr->cr_groups[0]);
219 grpsiz = (auth_len >> 2) - 5;
220 *tl++ = txdr_unsigned(grpsiz);
221 for (i = 1; i <= grpsiz; i++)
222 *tl++ = txdr_unsigned(cr->cr_groups[i]);
223 break;
224 }
225
226 /*
227 * And the verifier...
228 */
229 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
230 *tl++ = txdr_unsigned(RPCAUTH_NULL);
231 *tl = 0;
232 mb->m_next = mrest;
233 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
234 mreq->m_pkthdr.rcvif = NULL;
235 *mbp = mb;
236 return (mreq);
237 }
238
239 /*
240 * copies a uio scatter/gather list to an mbuf chain.
241 * NOTE: can ony handle iovcnt == 1
242 */
243 int
244 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
245 {
246 char *uiocp;
247 struct mbuf *mp, *mp2;
248 int xfer, left, mlen;
249 int uiosiz, clflg, rem;
250 char *cp;
251
252 #ifdef DIAGNOSTIC
253 if (uiop->uio_iovcnt != 1)
254 panic("nfsm_uiotombuf: iovcnt != 1");
255 #endif
256
257 if (siz > MLEN) /* or should it >= MCLBYTES ?? */
258 clflg = 1;
259 else
260 clflg = 0;
261 rem = nfsm_rndup(siz)-siz;
262 mp = mp2 = *mq;
263 while (siz > 0) {
264 left = uiop->uio_iov->iov_len;
265 uiocp = uiop->uio_iov->iov_base;
266 if (left > siz)
267 left = siz;
268 uiosiz = left;
269 while (left > 0) {
270 mlen = M_TRAILINGSPACE(mp);
271 if (mlen == 0) {
272 MGET(mp, M_TRYWAIT, MT_DATA);
273 if (clflg)
274 MCLGET(mp, M_TRYWAIT);
275 mp->m_len = 0;
276 mp2->m_next = mp;
277 mp2 = mp;
278 mlen = M_TRAILINGSPACE(mp);
279 }
280 xfer = (left > mlen) ? mlen : left;
281 #ifdef notdef
282 /* Not Yet.. */
283 if (uiop->uio_iov->iov_op != NULL)
284 (*(uiop->uio_iov->iov_op))
285 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
286 else
287 #endif
288 if (uiop->uio_segflg == UIO_SYSSPACE)
289 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
290 else
291 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
292 mp->m_len += xfer;
293 left -= xfer;
294 uiocp += xfer;
295 uiop->uio_offset += xfer;
296 uiop->uio_resid -= xfer;
297 }
298 uiop->uio_iov->iov_base =
299 (char *)uiop->uio_iov->iov_base + uiosiz;
300 uiop->uio_iov->iov_len -= uiosiz;
301 siz -= uiosiz;
302 }
303 if (rem > 0) {
304 if (rem > M_TRAILINGSPACE(mp)) {
305 MGET(mp, M_TRYWAIT, MT_DATA);
306 mp->m_len = 0;
307 mp2->m_next = mp;
308 }
309 cp = mtod(mp, caddr_t)+mp->m_len;
310 for (left = 0; left < rem; left++)
311 *cp++ = '\0';
312 mp->m_len += rem;
313 *bpos = cp;
314 } else
315 *bpos = mtod(mp, caddr_t)+mp->m_len;
316 *mq = mp;
317 return (0);
318 }
319
320 /*
321 * Copy a string into mbufs for the hard cases...
322 */
323 int
324 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
325 {
326 struct mbuf *m1 = NULL, *m2;
327 long left, xfer, len, tlen;
328 u_int32_t *tl;
329 int putsize;
330
331 putsize = 1;
332 m2 = *mb;
333 left = M_TRAILINGSPACE(m2);
334 if (left > 0) {
335 tl = ((u_int32_t *)(*bpos));
336 *tl++ = txdr_unsigned(siz);
337 putsize = 0;
338 left -= NFSX_UNSIGNED;
339 m2->m_len += NFSX_UNSIGNED;
340 if (left > 0) {
341 bcopy(cp, (caddr_t) tl, left);
342 siz -= left;
343 cp += left;
344 m2->m_len += left;
345 left = 0;
346 }
347 }
348 /* Loop around adding mbufs */
349 while (siz > 0) {
350 MGET(m1, M_TRYWAIT, MT_DATA);
351 if (siz > MLEN)
352 MCLGET(m1, M_TRYWAIT);
353 m1->m_len = NFSMSIZ(m1);
354 m2->m_next = m1;
355 m2 = m1;
356 tl = mtod(m1, u_int32_t *);
357 tlen = 0;
358 if (putsize) {
359 *tl++ = txdr_unsigned(siz);
360 m1->m_len -= NFSX_UNSIGNED;
361 tlen = NFSX_UNSIGNED;
362 putsize = 0;
363 }
364 if (siz < m1->m_len) {
365 len = nfsm_rndup(siz);
366 xfer = siz;
367 if (xfer < len)
368 *(tl+(xfer>>2)) = 0;
369 } else {
370 xfer = len = m1->m_len;
371 }
372 bcopy(cp, (caddr_t) tl, xfer);
373 m1->m_len = len+tlen;
374 siz -= xfer;
375 cp += xfer;
376 }
377 *mb = m1;
378 *bpos = mtod(m1, caddr_t)+m1->m_len;
379 return (0);
380 }
381
382 /*
383 * Called once to initialize data structures...
384 */
385 int
386 nfs_init(struct vfsconf *vfsp)
387 {
388 int i;
389
390 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
391 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
392 rpc_vers = txdr_unsigned(RPC_VER2);
393 rpc_call = txdr_unsigned(RPC_CALL);
394 rpc_reply = txdr_unsigned(RPC_REPLY);
395 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
396 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
397 rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
398 rpc_autherr = txdr_unsigned(RPC_AUTHERR);
399 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
400 nfs_true = txdr_unsigned(TRUE);
401 nfs_false = txdr_unsigned(FALSE);
402 nfs_xdrneg1 = txdr_unsigned(-1);
403 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
404 if (nfs_ticks < 1)
405 nfs_ticks = 1;
406 /* Ensure async daemons disabled */
407 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
408 nfs_iodwant[i] = NULL;
409 nfs_iodmount[i] = NULL;
410 }
411 nfs_nhinit(); /* Init the nfsnode table */
412
413 /*
414 * Initialize reply list and start timer
415 */
416 TAILQ_INIT(&nfs_reqq);
417 callout_init(&nfs_callout, 0);
418
419 nfs_prev_nfsclnt_sy_narg = sysent[SYS_nfsclnt].sy_narg;
420 sysent[SYS_nfsclnt].sy_narg = 2;
421 nfs_prev_nfsclnt_sy_call = sysent[SYS_nfsclnt].sy_call;
422 sysent[SYS_nfsclnt].sy_call = (sy_call_t *)nfsclnt;
423
424 nfs_pbuf_freecnt = nswbuf / 2 + 1;
425
426 return (0);
427 }
428
429 int
430 nfs_uninit(struct vfsconf *vfsp)
431 {
432 int i;
433
434 callout_stop(&nfs_callout);
435 sysent[SYS_nfsclnt].sy_narg = nfs_prev_nfsclnt_sy_narg;
436 sysent[SYS_nfsclnt].sy_call = nfs_prev_nfsclnt_sy_call;
437
438 KASSERT(TAILQ_EMPTY(&nfs_reqq),
439 ("nfs_uninit: request queue not empty"));
440
441 /*
442 * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
443 * any sleeping nfsiods so they check nfs_iodmax and exit.
444 */
445 nfs_iodmax = 0;
446 for (i = 0; i < nfs_numasync; i++)
447 if (nfs_iodwant[i])
448 wakeup(&nfs_iodwant[i]);
449 /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
450 while (nfs_numasync)
451 tsleep(&nfs_numasync, PWAIT, "ioddie", 0);
452
453 nfs_nhuninit();
454 uma_zdestroy(nfsmount_zone);
455 return (0);
456 }
457
458 /*
459 * Attribute cache routines.
460 * nfs_loadattrcache() - loads or updates the cache contents from attributes
461 * that are on the mbuf list
462 * nfs_getattrcache() - returns valid attributes if found in cache, returns
463 * error otherwise
464 */
465
466 /*
467 * Load the attribute cache (that lives in the nfsnode entry) with
468 * the values on the mbuf list and
469 * Iff vap not NULL
470 * copy the attributes to *vaper
471 */
472 int
473 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
474 struct vattr *vaper, int dontshrink)
475 {
476 struct vnode *vp = *vpp;
477 struct vattr *vap;
478 struct nfs_fattr *fp;
479 struct nfsnode *np;
480 int32_t t1;
481 caddr_t cp2;
482 int rdev;
483 struct mbuf *md;
484 enum vtype vtyp;
485 u_short vmode;
486 struct timespec mtime;
487 int v3 = NFS_ISV3(vp);
488
489 md = *mdp;
490 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
491 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1);
492 if (cp2 == NULL)
493 return EBADRPC;
494 fp = (struct nfs_fattr *)cp2;
495 if (v3) {
496 vtyp = nfsv3tov_type(fp->fa_type);
497 vmode = fxdr_unsigned(u_short, fp->fa_mode);
498 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
499 fxdr_unsigned(int, fp->fa3_rdev.specdata2));
500 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
501 } else {
502 vtyp = nfsv2tov_type(fp->fa_type);
503 vmode = fxdr_unsigned(u_short, fp->fa_mode);
504 /*
505 * XXX
506 *
507 * The duplicate information returned in fa_type and fa_mode
508 * is an ambiguity in the NFS version 2 protocol.
509 *
510 * VREG should be taken literally as a regular file. If a
511 * server intents to return some type information differently
512 * in the upper bits of the mode field (e.g. for sockets, or
513 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
514 * leave the examination of the mode bits even in the VREG
515 * case to avoid breakage for bogus servers, but we make sure
516 * that there are actually type bits set in the upper part of
517 * fa_mode (and failing that, trust the va_type field).
518 *
519 * NFSv3 cleared the issue, and requires fa_mode to not
520 * contain any type information (while also introduing sockets
521 * and FIFOs for fa_type).
522 */
523 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
524 vtyp = IFTOVT(vmode);
525 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
526 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
527
528 /*
529 * Really ugly NFSv2 kludge.
530 */
531 if (vtyp == VCHR && rdev == 0xffffffff)
532 vtyp = VFIFO;
533 }
534
535 /*
536 * If v_type == VNON it is a new node, so fill in the v_type,
537 * n_mtime fields. Check to see if it represents a special
538 * device, and if so, check for a possible alias. Once the
539 * correct vnode has been obtained, fill in the rest of the
540 * information.
541 */
542 np = VTONFS(vp);
543 if (vp->v_type != vtyp) {
544 vp->v_type = vtyp;
545 if (vp->v_type == VFIFO)
546 vp->v_op = fifo_nfsnodeop_p;
547 else if (vp->v_type == VBLK)
548 vp->v_op = spec_nfsnodeop_p;
549 else if (vp->v_type == VCHR) {
550 vp->v_op = spec_nfsnodeop_p;
551 vp = addaliasu(vp, rdev);
552 np->n_vnode = vp;
553 }
554 np->n_mtime = mtime.tv_sec;
555 }
556 vap = &np->n_vattr;
557 vap->va_type = vtyp;
558 vap->va_mode = (vmode & 07777);
559 vap->va_rdev = rdev;
560 vap->va_mtime = mtime;
561 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
562 if (v3) {
563 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
564 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
565 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
566 vap->va_size = fxdr_hyper(&fp->fa3_size);
567 vap->va_blocksize = NFS_FABLKSIZE;
568 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
569 vap->va_fileid = fxdr_unsigned(int32_t,
570 fp->fa3_fileid.nfsuquad[1]);
571 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
572 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
573 vap->va_flags = 0;
574 vap->va_filerev = 0;
575 } else {
576 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
577 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
578 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
579 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
580 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
581 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
582 * NFS_FABLKSIZE;
583 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
584 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
585 vap->va_flags = 0;
586 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
587 fp->fa2_ctime.nfsv2_sec);
588 vap->va_ctime.tv_nsec = 0;
589 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
590 vap->va_filerev = 0;
591 }
592 np->n_attrstamp = time_second;
593 if (vap->va_size != np->n_size) {
594 if (vap->va_type == VREG) {
595 if (dontshrink && vap->va_size < np->n_size) {
596 /*
597 * We've been told not to shrink the file;
598 * zero np->n_attrstamp to indicate that
599 * the attributes are stale.
600 */
601 vap->va_size = np->n_size;
602 np->n_attrstamp = 0;
603 } else if (np->n_flag & NMODIFIED) {
604 /*
605 * We've modified the file: Use the larger
606 * of our size, and the server's size.
607 */
608 if (vap->va_size < np->n_size) {
609 vap->va_size = np->n_size;
610 } else {
611 np->n_size = vap->va_size;
612 np->n_flag |= NSIZECHANGED;
613 }
614 } else {
615 np->n_size = vap->va_size;
616 np->n_flag |= NSIZECHANGED;
617 }
618 vnode_pager_setsize(vp, np->n_size);
619 } else {
620 np->n_size = vap->va_size;
621 }
622 }
623 if (vaper != NULL) {
624 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
625 if (np->n_flag & NCHG) {
626 if (np->n_flag & NACC)
627 vaper->va_atime = np->n_atim;
628 if (np->n_flag & NUPD)
629 vaper->va_mtime = np->n_mtim;
630 }
631 }
632 return (0);
633 }
634
635 #ifdef NFS_ACDEBUG
636 #include <sys/sysctl.h>
637 SYSCTL_DECL(_vfs_nfs);
638 static int nfs_acdebug;
639 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
640 #endif
641
642 /*
643 * Check the time stamp
644 * If the cache is valid, copy contents to *vap and return 0
645 * otherwise return an error
646 */
647 int
648 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
649 {
650 struct nfsnode *np;
651 struct vattr *vap;
652 struct nfsmount *nmp;
653 int timeo;
654
655 np = VTONFS(vp);
656 vap = &np->n_vattr;
657 nmp = VFSTONFS(vp->v_mount);
658 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
659 timeo = (time_second - np->n_mtime) / 10;
660
661 #ifdef NFS_ACDEBUG
662 if (nfs_acdebug>1)
663 printf("nfs_getattrcache: initial timeo = %d\n", timeo);
664 #endif
665
666 if (vap->va_type == VDIR) {
667 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
668 timeo = nmp->nm_acdirmin;
669 else if (timeo > nmp->nm_acdirmax)
670 timeo = nmp->nm_acdirmax;
671 } else {
672 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
673 timeo = nmp->nm_acregmin;
674 else if (timeo > nmp->nm_acregmax)
675 timeo = nmp->nm_acregmax;
676 }
677
678 #ifdef NFS_ACDEBUG
679 if (nfs_acdebug > 2)
680 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
681 nmp->nm_acregmin, nmp->nm_acregmax,
682 nmp->nm_acdirmin, nmp->nm_acdirmax);
683
684 if (nfs_acdebug)
685 printf("nfs_getattrcache: age = %d; final timeo = %d\n",
686 (time_second - np->n_attrstamp), timeo);
687 #endif
688
689 if ((time_second - np->n_attrstamp) >= timeo) {
690 nfsstats.attrcache_misses++;
691 return (ENOENT);
692 }
693 nfsstats.attrcache_hits++;
694 if (vap->va_size != np->n_size) {
695 if (vap->va_type == VREG) {
696 if (np->n_flag & NMODIFIED) {
697 if (vap->va_size < np->n_size)
698 vap->va_size = np->n_size;
699 else
700 np->n_size = vap->va_size;
701 } else {
702 np->n_size = vap->va_size;
703 }
704 vnode_pager_setsize(vp, np->n_size);
705 } else {
706 np->n_size = vap->va_size;
707 }
708 }
709 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
710 if (np->n_flag & NCHG) {
711 if (np->n_flag & NACC)
712 vaper->va_atime = np->n_atim;
713 if (np->n_flag & NUPD)
714 vaper->va_mtime = np->n_mtim;
715 }
716 return (0);
717 }
718
719 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
720 /*
721 * This function finds the directory cookie that corresponds to the
722 * logical byte offset given.
723 */
724 nfsuint64 *
725 nfs_getcookie(struct nfsnode *np, off_t off, int add)
726 {
727 struct nfsdmap *dp, *dp2;
728 int pos;
729
730 pos = (uoff_t)off / NFS_DIRBLKSIZ;
731 if (pos == 0 || off < 0) {
732 #ifdef DIAGNOSTIC
733 if (add)
734 panic("nfs getcookie add at <= 0");
735 #endif
736 return (&nfs_nullcookie);
737 }
738 pos--;
739 dp = LIST_FIRST(&np->n_cookies);
740 if (!dp) {
741 if (add) {
742 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
743 M_NFSDIROFF, M_WAITOK);
744 dp->ndm_eocookie = 0;
745 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
746 } else
747 return (NULL);
748 }
749 while (pos >= NFSNUMCOOKIES) {
750 pos -= NFSNUMCOOKIES;
751 if (LIST_NEXT(dp, ndm_list)) {
752 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
753 pos >= dp->ndm_eocookie)
754 return (NULL);
755 dp = LIST_NEXT(dp, ndm_list);
756 } else if (add) {
757 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
758 M_NFSDIROFF, M_WAITOK);
759 dp2->ndm_eocookie = 0;
760 LIST_INSERT_AFTER(dp, dp2, ndm_list);
761 dp = dp2;
762 } else
763 return (NULL);
764 }
765 if (pos >= dp->ndm_eocookie) {
766 if (add)
767 dp->ndm_eocookie = pos + 1;
768 else
769 return (NULL);
770 }
771 return (&dp->ndm_cookies[pos]);
772 }
773
774 /*
775 * Invalidate cached directory information, except for the actual directory
776 * blocks (which are invalidated separately).
777 * Done mainly to avoid the use of stale offset cookies.
778 */
779 void
780 nfs_invaldir(struct vnode *vp)
781 {
782 struct nfsnode *np = VTONFS(vp);
783
784 #ifdef DIAGNOSTIC
785 if (vp->v_type != VDIR)
786 panic("nfs: invaldir not dir");
787 #endif
788 np->n_direofoffset = 0;
789 np->n_cookieverf.nfsuquad[0] = 0;
790 np->n_cookieverf.nfsuquad[1] = 0;
791 if (LIST_FIRST(&np->n_cookies))
792 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
793 }
794
795 /*
796 * The write verifier has changed (probably due to a server reboot), so all
797 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
798 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
799 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
800 * mount point.
801 *
802 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
803 * writes are not clusterable.
804 */
805 void
806 nfs_clearcommit(struct mount *mp)
807 {
808 struct vnode *vp, *nvp;
809 struct buf *bp, *nbp;
810 int s;
811
812 GIANT_REQUIRED;
813
814 s = splbio();
815 MNT_ILOCK(mp);
816 MNT_VNODE_FOREACH(vp, mp, nvp) {
817 VI_LOCK(vp);
818 if (vp->v_iflag & VI_XLOCK) {
819 VI_UNLOCK(vp);
820 continue;
821 }
822 MNT_IUNLOCK(mp);
823 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
824 nbp = TAILQ_NEXT(bp, b_vnbufs);
825 if (BUF_REFCNT(bp) == 0 &&
826 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
827 == (B_DELWRI | B_NEEDCOMMIT))
828 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
829 }
830 VI_UNLOCK(vp);
831 MNT_ILOCK(mp);
832 }
833 MNT_IUNLOCK(mp);
834 splx(s);
835 }
836
837 /*
838 * Helper functions for former macros. Some of these should be
839 * moved to their callers.
840 */
841
842 int
843 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
844 struct mbuf **md, caddr_t *dpos)
845 {
846 struct nfsnode *ttnp;
847 struct vnode *ttvp;
848 nfsfh_t *ttfhp;
849 u_int32_t *tl;
850 int ttfhsize;
851 int t1;
852
853 if (v3) {
854 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
855 if (tl == NULL)
856 return EBADRPC;
857 *f = fxdr_unsigned(int, *tl);
858 } else
859 *f = 1;
860 if (*f) {
861 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
862 if (t1 != 0)
863 return t1;
864 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp);
865 if (t1 != 0)
866 return t1;
867 *v = NFSTOV(ttnp);
868 }
869 if (v3) {
870 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
871 if (tl == NULL)
872 return EBADRPC;
873 if (*f)
874 *f = fxdr_unsigned(int, *tl);
875 else if (fxdr_unsigned(int, *tl))
876 nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
877 }
878 if (*f) {
879 ttvp = *v;
880 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
881 if (t1)
882 return t1;
883 *v = ttvp;
884 }
885 return 0;
886 }
887
888 int
889 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
890 {
891 u_int32_t *tl;
892
893 if (v3) {
894 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
895 if (tl == NULL)
896 return EBADRPC;
897 *s = fxdr_unsigned(int, *tl);
898 if (*s <= 0 || *s > NFSX_V3FHMAX)
899 return EBADRPC;
900 } else
901 *s = NFSX_V2FH;
902 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
903 if (*f == NULL)
904 return EBADRPC;
905 else
906 return 0;
907 }
908
909
910 int
911 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
912 caddr_t *dpos)
913 {
914 int t1;
915
916 struct vnode *ttvp = *v;
917 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
918 if (t1 != 0)
919 return t1;
920 *v = ttvp;
921 return 0;
922 }
923
924 int
925 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
926 caddr_t *dpos)
927 {
928 u_int32_t *tl;
929 int t1;
930
931 struct vnode *ttvp = *v;
932 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
933 if (tl == NULL)
934 return EBADRPC;
935 *f = fxdr_unsigned(int, *tl);
936 if (*f != 0) {
937 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
938 if (t1 != 0) {
939 *f = 0;
940 return t1;
941 }
942 *v = ttvp;
943 }
944 return 0;
945 }
946
947 int
948 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
949 {
950 u_int32_t *tl;
951 int ttattrf, ttretf = 0;
952 int t1;
953
954 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
955 if (tl == NULL)
956 return EBADRPC;
957 if (*tl == nfs_true) {
958 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
959 if (tl == NULL)
960 return EBADRPC;
961 if (*f)
962 ttretf = (VTONFS(*v)->n_mtime ==
963 fxdr_unsigned(u_int32_t, *(tl + 2)));
964 }
965 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
966 if (t1)
967 return t1;
968 if (*f)
969 *f = ttretf;
970 else
971 *f = ttattrf;
972 return 0;
973 }
974
975 int
976 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
977 {
978 u_int32_t *tl;
979 int t1;
980
981 if (s > m)
982 return ENAMETOOLONG;
983 t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
984 if (t1 <= M_TRAILINGSPACE(*mb)) {
985 tl = nfsm_build_xx(t1, mb, bpos);
986 *tl++ = txdr_unsigned(s);
987 *(tl + ((t1 >> 2) - 2)) = 0;
988 bcopy(a, tl, s);
989 } else {
990 t1 = nfsm_strtmbuf(mb, bpos, a, s);
991 if (t1 != 0)
992 return t1;
993 }
994 return 0;
995 }
996
997 int
998 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
999 {
1000 u_int32_t *tl;
1001 int t1;
1002 caddr_t cp;
1003
1004 if (v3) {
1005 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
1006 if (t1 < M_TRAILINGSPACE(*mb)) {
1007 tl = nfsm_build_xx(t1, mb, bpos);
1008 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
1009 *(tl + ((t1 >> 2) - 2)) = 0;
1010 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
1011 } else {
1012 t1 = nfsm_strtmbuf(mb, bpos,
1013 (const char *)VTONFS(v)->n_fhp,
1014 VTONFS(v)->n_fhsize);
1015 if (t1 != 0)
1016 return t1;
1017 }
1018 } else {
1019 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
1020 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
1021 }
1022 return 0;
1023 }
1024
1025 void
1026 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
1027 caddr_t *bpos)
1028 {
1029 u_int32_t *tl;
1030
1031 if (va->va_mode != (mode_t)VNOVAL) {
1032 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1033 *tl++ = nfs_true;
1034 *tl = txdr_unsigned(va->va_mode);
1035 } else {
1036 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1037 *tl = nfs_false;
1038 }
1039 if (full && va->va_uid != (uid_t)VNOVAL) {
1040 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1041 *tl++ = nfs_true;
1042 *tl = txdr_unsigned(va->va_uid);
1043 } else {
1044 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1045 *tl = nfs_false;
1046 }
1047 if (full && va->va_gid != (gid_t)VNOVAL) {
1048 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1049 *tl++ = nfs_true;
1050 *tl = txdr_unsigned(va->va_gid);
1051 } else {
1052 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1053 *tl = nfs_false;
1054 }
1055 if (full && va->va_size != VNOVAL) {
1056 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1057 *tl++ = nfs_true;
1058 txdr_hyper(va->va_size, tl);
1059 } else {
1060 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1061 *tl = nfs_false;
1062 }
1063 if (va->va_atime.tv_sec != VNOVAL) {
1064 if (va->va_atime.tv_sec != time_second) {
1065 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1066 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1067 txdr_nfsv3time(&va->va_atime, tl);
1068 } else {
1069 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1070 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1071 }
1072 } else {
1073 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1074 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1075 }
1076 if (va->va_mtime.tv_sec != VNOVAL) {
1077 if (va->va_mtime.tv_sec != time_second) {
1078 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1079 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1080 txdr_nfsv3time(&va->va_mtime, tl);
1081 } else {
1082 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1083 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1084 }
1085 } else {
1086 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1087 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1088 }
1089 }
Cache object: c055d307285cb25453fc905fdf834b00
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