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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/5.0/sys/nfsclient/nfs_subs.c 104908 2002-10-11 14:58:34Z mike $");
41
42 /*
43 * These functions support the macros and help fiddle mbuf chains for
44 * the nfs op functions. They do things like create the rpc header and
45 * copy data between mbuf chains and uio lists.
46 */
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/bio.h>
52 #include <sys/buf.h>
53 #include <sys/proc.h>
54 #include <sys/mount.h>
55 #include <sys/vnode.h>
56 #include <sys/namei.h>
57 #include <sys/mbuf.h>
58 #include <sys/socket.h>
59 #include <sys/stat.h>
60 #include <sys/malloc.h>
61 #include <sys/sysent.h>
62 #include <sys/syscall.h>
63 #include <sys/sysproto.h>
64
65 #include <vm/vm.h>
66 #include <vm/vm_object.h>
67 #include <vm/vm_extern.h>
68 #include <vm/uma.h>
69
70 #include <nfs/rpcv2.h>
71 #include <nfs/nfsproto.h>
72 #include <nfsclient/nfs.h>
73 #include <nfsclient/nfsnode.h>
74 #include <nfs/xdr_subs.h>
75 #include <nfsclient/nfsm_subs.h>
76 #include <nfsclient/nfsmount.h>
77
78 #include <netinet/in.h>
79
80 /*
81 * Data items converted to xdr at startup, since they are constant
82 * This is kinda hokey, but may save a little time doing byte swaps
83 */
84 u_int32_t nfs_xdrneg1;
85 u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
86 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
87 u_int32_t nfs_true, nfs_false;
88
89 /* And other global data */
90 static u_int32_t nfs_xid = 0;
91 static enum vtype nv2tov_type[8]= {
92 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
93 };
94
95 int nfs_ticks;
96 int nfs_pbuf_freecnt = -1; /* start out unlimited */
97
98 struct nfs_reqq nfs_reqq;
99 struct nfs_bufq nfs_bufq;
100
101 static int nfs_prev_nfsclnt_sy_narg;
102 static sy_call_t *nfs_prev_nfsclnt_sy_call;
103
104 /*
105 * and the reverse mapping from generic to Version 2 procedure numbers
106 */
107 int nfsv2_procid[NFS_NPROCS] = {
108 NFSV2PROC_NULL,
109 NFSV2PROC_GETATTR,
110 NFSV2PROC_SETATTR,
111 NFSV2PROC_LOOKUP,
112 NFSV2PROC_NOOP,
113 NFSV2PROC_READLINK,
114 NFSV2PROC_READ,
115 NFSV2PROC_WRITE,
116 NFSV2PROC_CREATE,
117 NFSV2PROC_MKDIR,
118 NFSV2PROC_SYMLINK,
119 NFSV2PROC_CREATE,
120 NFSV2PROC_REMOVE,
121 NFSV2PROC_RMDIR,
122 NFSV2PROC_RENAME,
123 NFSV2PROC_LINK,
124 NFSV2PROC_READDIR,
125 NFSV2PROC_NOOP,
126 NFSV2PROC_STATFS,
127 NFSV2PROC_NOOP,
128 NFSV2PROC_NOOP,
129 NFSV2PROC_NOOP,
130 NFSV2PROC_NOOP,
131 };
132
133 LIST_HEAD(nfsnodehashhead, nfsnode);
134
135 /*
136 * Create the header for an rpc request packet
137 * The hsiz is the size of the rest of the nfs request header.
138 * (just used to decide if a cluster is a good idea)
139 */
140 struct mbuf *
141 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
142 {
143 struct mbuf *mb;
144
145 MGET(mb, M_TRYWAIT, MT_DATA);
146 if (hsiz >= MINCLSIZE)
147 MCLGET(mb, M_TRYWAIT);
148 mb->m_len = 0;
149 return (mb);
150 }
151
152 /*
153 * Build the RPC header and fill in the authorization info.
154 * The authorization string argument is only used when the credentials
155 * come from outside of the kernel.
156 * Returns the head of the mbuf list.
157 */
158 struct mbuf *
159 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type,
160 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp,
161 u_int32_t *xidp)
162 {
163 struct mbuf *mb;
164 u_int32_t *tl;
165 caddr_t bpos;
166 int i;
167 struct mbuf *mreq;
168 int grpsiz, authsiz;
169
170 authsiz = nfsm_rndup(auth_len);
171 MGETHDR(mb, M_TRYWAIT, MT_DATA);
172 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
173 MCLGET(mb, M_TRYWAIT);
174 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
175 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
176 } else {
177 MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
178 }
179 mb->m_len = 0;
180 mreq = mb;
181 bpos = mtod(mb, caddr_t);
182
183 /*
184 * First the RPC header.
185 */
186 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED);
187
188 /* Get a pretty random xid to start with */
189 if (!nfs_xid)
190 nfs_xid = random();
191 /*
192 * Skip zero xid if it should ever happen.
193 */
194 if (++nfs_xid == 0)
195 nfs_xid++;
196
197 *tl++ = *xidp = txdr_unsigned(nfs_xid);
198 *tl++ = rpc_call;
199 *tl++ = rpc_vers;
200 *tl++ = txdr_unsigned(NFS_PROG);
201 if (nmflag & NFSMNT_NFSV3) {
202 *tl++ = txdr_unsigned(NFS_VER3);
203 *tl++ = txdr_unsigned(procid);
204 } else {
205 *tl++ = txdr_unsigned(NFS_VER2);
206 *tl++ = txdr_unsigned(nfsv2_procid[procid]);
207 }
208
209 /*
210 * And then the authorization cred.
211 */
212 *tl++ = txdr_unsigned(auth_type);
213 *tl = txdr_unsigned(authsiz);
214 switch (auth_type) {
215 case RPCAUTH_UNIX:
216 tl = nfsm_build(u_int32_t *, auth_len);
217 *tl++ = 0; /* stamp ?? */
218 *tl++ = 0; /* NULL hostname */
219 *tl++ = txdr_unsigned(cr->cr_uid);
220 *tl++ = txdr_unsigned(cr->cr_groups[0]);
221 grpsiz = (auth_len >> 2) - 5;
222 *tl++ = txdr_unsigned(grpsiz);
223 for (i = 1; i <= grpsiz; i++)
224 *tl++ = txdr_unsigned(cr->cr_groups[i]);
225 break;
226 }
227
228 /*
229 * And the verifier...
230 */
231 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
232 *tl++ = txdr_unsigned(RPCAUTH_NULL);
233 *tl = 0;
234 mb->m_next = mrest;
235 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
236 mreq->m_pkthdr.rcvif = NULL;
237 *mbp = mb;
238 return (mreq);
239 }
240
241 /*
242 * copies a uio scatter/gather list to an mbuf chain.
243 * NOTE: can ony handle iovcnt == 1
244 */
245 int
246 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
247 {
248 char *uiocp;
249 struct mbuf *mp, *mp2;
250 int xfer, left, mlen;
251 int uiosiz, clflg, rem;
252 char *cp;
253
254 #ifdef DIAGNOSTIC
255 if (uiop->uio_iovcnt != 1)
256 panic("nfsm_uiotombuf: iovcnt != 1");
257 #endif
258
259 if (siz > MLEN) /* or should it >= MCLBYTES ?? */
260 clflg = 1;
261 else
262 clflg = 0;
263 rem = nfsm_rndup(siz)-siz;
264 mp = mp2 = *mq;
265 while (siz > 0) {
266 left = uiop->uio_iov->iov_len;
267 uiocp = uiop->uio_iov->iov_base;
268 if (left > siz)
269 left = siz;
270 uiosiz = left;
271 while (left > 0) {
272 mlen = M_TRAILINGSPACE(mp);
273 if (mlen == 0) {
274 MGET(mp, M_TRYWAIT, MT_DATA);
275 if (clflg)
276 MCLGET(mp, M_TRYWAIT);
277 mp->m_len = 0;
278 mp2->m_next = mp;
279 mp2 = mp;
280 mlen = M_TRAILINGSPACE(mp);
281 }
282 xfer = (left > mlen) ? mlen : left;
283 #ifdef notdef
284 /* Not Yet.. */
285 if (uiop->uio_iov->iov_op != NULL)
286 (*(uiop->uio_iov->iov_op))
287 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
288 else
289 #endif
290 if (uiop->uio_segflg == UIO_SYSSPACE)
291 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
292 else
293 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
294 mp->m_len += xfer;
295 left -= xfer;
296 uiocp += xfer;
297 uiop->uio_offset += xfer;
298 uiop->uio_resid -= xfer;
299 }
300 uiop->uio_iov->iov_base =
301 (char *)uiop->uio_iov->iov_base + uiosiz;
302 uiop->uio_iov->iov_len -= uiosiz;
303 siz -= uiosiz;
304 }
305 if (rem > 0) {
306 if (rem > M_TRAILINGSPACE(mp)) {
307 MGET(mp, M_TRYWAIT, MT_DATA);
308 mp->m_len = 0;
309 mp2->m_next = mp;
310 }
311 cp = mtod(mp, caddr_t)+mp->m_len;
312 for (left = 0; left < rem; left++)
313 *cp++ = '\0';
314 mp->m_len += rem;
315 *bpos = cp;
316 } else
317 *bpos = mtod(mp, caddr_t)+mp->m_len;
318 *mq = mp;
319 return (0);
320 }
321
322 /*
323 * Copy a string into mbufs for the hard cases...
324 */
325 int
326 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
327 {
328 struct mbuf *m1 = NULL, *m2;
329 long left, xfer, len, tlen;
330 u_int32_t *tl;
331 int putsize;
332
333 putsize = 1;
334 m2 = *mb;
335 left = M_TRAILINGSPACE(m2);
336 if (left > 0) {
337 tl = ((u_int32_t *)(*bpos));
338 *tl++ = txdr_unsigned(siz);
339 putsize = 0;
340 left -= NFSX_UNSIGNED;
341 m2->m_len += NFSX_UNSIGNED;
342 if (left > 0) {
343 bcopy(cp, (caddr_t) tl, left);
344 siz -= left;
345 cp += left;
346 m2->m_len += left;
347 left = 0;
348 }
349 }
350 /* Loop around adding mbufs */
351 while (siz > 0) {
352 MGET(m1, M_TRYWAIT, MT_DATA);
353 if (siz > MLEN)
354 MCLGET(m1, M_TRYWAIT);
355 m1->m_len = NFSMSIZ(m1);
356 m2->m_next = m1;
357 m2 = m1;
358 tl = mtod(m1, u_int32_t *);
359 tlen = 0;
360 if (putsize) {
361 *tl++ = txdr_unsigned(siz);
362 m1->m_len -= NFSX_UNSIGNED;
363 tlen = NFSX_UNSIGNED;
364 putsize = 0;
365 }
366 if (siz < m1->m_len) {
367 len = nfsm_rndup(siz);
368 xfer = siz;
369 if (xfer < len)
370 *(tl+(xfer>>2)) = 0;
371 } else {
372 xfer = len = m1->m_len;
373 }
374 bcopy(cp, (caddr_t) tl, xfer);
375 m1->m_len = len+tlen;
376 siz -= xfer;
377 cp += xfer;
378 }
379 *mb = m1;
380 *bpos = mtod(m1, caddr_t)+m1->m_len;
381 return (0);
382 }
383
384 /*
385 * Called once to initialize data structures...
386 */
387 int
388 nfs_init(struct vfsconf *vfsp)
389 {
390 int i;
391
392 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
393 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
394 rpc_vers = txdr_unsigned(RPC_VER2);
395 rpc_call = txdr_unsigned(RPC_CALL);
396 rpc_reply = txdr_unsigned(RPC_REPLY);
397 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
398 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
399 rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
400 rpc_autherr = txdr_unsigned(RPC_AUTHERR);
401 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
402 nfs_true = txdr_unsigned(TRUE);
403 nfs_false = txdr_unsigned(FALSE);
404 nfs_xdrneg1 = txdr_unsigned(-1);
405 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
406 if (nfs_ticks < 1)
407 nfs_ticks = 1;
408 /* Ensure async daemons disabled */
409 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
410 nfs_iodwant[i] = NULL;
411 nfs_iodmount[i] = NULL;
412 }
413 nfs_nhinit(); /* Init the nfsnode table */
414
415 /*
416 * Initialize reply list and start timer
417 */
418 TAILQ_INIT(&nfs_reqq);
419
420 nfs_timer(0);
421
422 nfs_prev_nfsclnt_sy_narg = sysent[SYS_nfsclnt].sy_narg;
423 sysent[SYS_nfsclnt].sy_narg = 2;
424 nfs_prev_nfsclnt_sy_call = sysent[SYS_nfsclnt].sy_call;
425 sysent[SYS_nfsclnt].sy_call = (sy_call_t *)nfsclnt;
426
427 nfs_pbuf_freecnt = nswbuf / 2 + 1;
428
429 return (0);
430 }
431
432 int
433 nfs_uninit(struct vfsconf *vfsp)
434 {
435
436 untimeout(nfs_timer, (void *)NULL, nfs_timer_handle);
437 sysent[SYS_nfsclnt].sy_narg = nfs_prev_nfsclnt_sy_narg;
438 sysent[SYS_nfsclnt].sy_call = nfs_prev_nfsclnt_sy_call;
439 return (0);
440 }
441
442 /*
443 * Attribute cache routines.
444 * nfs_loadattrcache() - loads or updates the cache contents from attributes
445 * that are on the mbuf list
446 * nfs_getattrcache() - returns valid attributes if found in cache, returns
447 * error otherwise
448 */
449
450 /*
451 * Load the attribute cache (that lives in the nfsnode entry) with
452 * the values on the mbuf list and
453 * Iff vap not NULL
454 * copy the attributes to *vaper
455 */
456 int
457 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
458 struct vattr *vaper, int dontshrink)
459 {
460 struct vnode *vp = *vpp;
461 struct vattr *vap;
462 struct nfs_fattr *fp;
463 struct nfsnode *np;
464 int32_t t1;
465 caddr_t cp2;
466 int rdev;
467 struct mbuf *md;
468 enum vtype vtyp;
469 u_short vmode;
470 struct timespec mtime;
471 int v3 = NFS_ISV3(vp);
472
473 md = *mdp;
474 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
475 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1);
476 if (cp2 == NULL)
477 return EBADRPC;
478 fp = (struct nfs_fattr *)cp2;
479 if (v3) {
480 vtyp = nfsv3tov_type(fp->fa_type);
481 vmode = fxdr_unsigned(u_short, fp->fa_mode);
482 rdev = makeudev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
483 fxdr_unsigned(int, fp->fa3_rdev.specdata2));
484 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
485 } else {
486 vtyp = nfsv2tov_type(fp->fa_type);
487 vmode = fxdr_unsigned(u_short, fp->fa_mode);
488 /*
489 * XXX
490 *
491 * The duplicate information returned in fa_type and fa_mode
492 * is an ambiguity in the NFS version 2 protocol.
493 *
494 * VREG should be taken literally as a regular file. If a
495 * server intents to return some type information differently
496 * in the upper bits of the mode field (e.g. for sockets, or
497 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
498 * leave the examination of the mode bits even in the VREG
499 * case to avoid breakage for bogus servers, but we make sure
500 * that there are actually type bits set in the upper part of
501 * fa_mode (and failing that, trust the va_type field).
502 *
503 * NFSv3 cleared the issue, and requires fa_mode to not
504 * contain any type information (while also introduing sockets
505 * and FIFOs for fa_type).
506 */
507 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
508 vtyp = IFTOVT(vmode);
509 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
510 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
511
512 /*
513 * Really ugly NFSv2 kludge.
514 */
515 if (vtyp == VCHR && rdev == 0xffffffff)
516 vtyp = VFIFO;
517 }
518
519 /*
520 * If v_type == VNON it is a new node, so fill in the v_type,
521 * n_mtime fields. Check to see if it represents a special
522 * device, and if so, check for a possible alias. Once the
523 * correct vnode has been obtained, fill in the rest of the
524 * information.
525 */
526 np = VTONFS(vp);
527 if (vp->v_type != vtyp) {
528 vp->v_type = vtyp;
529 if (vp->v_type == VFIFO) {
530 vp->v_op = fifo_nfsv2nodeop_p;
531 }
532 if (vp->v_type == VCHR || vp->v_type == VBLK) {
533 vp->v_op = spec_nfsv2nodeop_p;
534 vp = addaliasu(vp, rdev);
535 np->n_vnode = vp;
536 }
537 np->n_mtime = mtime.tv_sec;
538 }
539 vap = &np->n_vattr;
540 vap->va_type = vtyp;
541 vap->va_mode = (vmode & 07777);
542 vap->va_rdev = rdev;
543 vap->va_mtime = mtime;
544 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
545 if (v3) {
546 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
547 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
548 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
549 vap->va_size = fxdr_hyper(&fp->fa3_size);
550 vap->va_blocksize = NFS_FABLKSIZE;
551 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
552 vap->va_fileid = fxdr_unsigned(int32_t,
553 fp->fa3_fileid.nfsuquad[1]);
554 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
555 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
556 vap->va_flags = 0;
557 vap->va_filerev = 0;
558 } else {
559 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
560 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
561 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
562 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
563 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
564 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
565 * NFS_FABLKSIZE;
566 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
567 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
568 vap->va_flags = 0;
569 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
570 fp->fa2_ctime.nfsv2_sec);
571 vap->va_ctime.tv_nsec = 0;
572 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
573 vap->va_filerev = 0;
574 }
575 np->n_attrstamp = time_second;
576 if (vap->va_size != np->n_size) {
577 if (vap->va_type == VREG) {
578 if (dontshrink && vap->va_size < np->n_size) {
579 /*
580 * We've been told not to shrink the file;
581 * zero np->n_attrstamp to indicate that
582 * the attributes are stale.
583 */
584 vap->va_size = np->n_size;
585 np->n_attrstamp = 0;
586 } else if (np->n_flag & NMODIFIED) {
587 if (vap->va_size < np->n_size)
588 vap->va_size = np->n_size;
589 else
590 np->n_size = vap->va_size;
591 } else {
592 np->n_size = vap->va_size;
593 }
594 vnode_pager_setsize(vp, np->n_size);
595 } else {
596 np->n_size = vap->va_size;
597 }
598 }
599 if (vaper != NULL) {
600 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
601 if (np->n_flag & NCHG) {
602 if (np->n_flag & NACC)
603 vaper->va_atime = np->n_atim;
604 if (np->n_flag & NUPD)
605 vaper->va_mtime = np->n_mtim;
606 }
607 }
608 return (0);
609 }
610
611 #ifdef NFS_ACDEBUG
612 #include <sys/sysctl.h>
613 SYSCTL_DECL(_vfs_nfs);
614 static int nfs_acdebug;
615 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
616 #endif
617
618 /*
619 * Check the time stamp
620 * If the cache is valid, copy contents to *vap and return 0
621 * otherwise return an error
622 */
623 int
624 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
625 {
626 struct nfsnode *np;
627 struct vattr *vap;
628 struct nfsmount *nmp;
629 int timeo;
630
631 np = VTONFS(vp);
632 vap = &np->n_vattr;
633 nmp = VFSTONFS(vp->v_mount);
634 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
635 timeo = (time_second - np->n_mtime) / 10;
636
637 #ifdef NFS_ACDEBUG
638 if (nfs_acdebug>1)
639 printf("nfs_getattrcache: initial timeo = %d\n", timeo);
640 #endif
641
642 if (vap->va_type == VDIR) {
643 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
644 timeo = nmp->nm_acdirmin;
645 else if (timeo > nmp->nm_acdirmax)
646 timeo = nmp->nm_acdirmax;
647 } else {
648 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
649 timeo = nmp->nm_acregmin;
650 else if (timeo > nmp->nm_acregmax)
651 timeo = nmp->nm_acregmax;
652 }
653
654 #ifdef NFS_ACDEBUG
655 if (nfs_acdebug > 2)
656 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
657 nmp->nm_acregmin, nmp->nm_acregmax,
658 nmp->nm_acdirmin, nmp->nm_acdirmax);
659
660 if (nfs_acdebug)
661 printf("nfs_getattrcache: age = %d; final timeo = %d\n",
662 (time_second - np->n_attrstamp), timeo);
663 #endif
664
665 if ((time_second - np->n_attrstamp) >= timeo) {
666 nfsstats.attrcache_misses++;
667 return (ENOENT);
668 }
669 nfsstats.attrcache_hits++;
670 if (vap->va_size != np->n_size) {
671 if (vap->va_type == VREG) {
672 if (np->n_flag & NMODIFIED) {
673 if (vap->va_size < np->n_size)
674 vap->va_size = np->n_size;
675 else
676 np->n_size = vap->va_size;
677 } else {
678 np->n_size = vap->va_size;
679 }
680 vnode_pager_setsize(vp, np->n_size);
681 } else {
682 np->n_size = vap->va_size;
683 }
684 }
685 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
686 if (np->n_flag & NCHG) {
687 if (np->n_flag & NACC)
688 vaper->va_atime = np->n_atim;
689 if (np->n_flag & NUPD)
690 vaper->va_mtime = np->n_mtim;
691 }
692 return (0);
693 }
694
695 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
696 /*
697 * This function finds the directory cookie that corresponds to the
698 * logical byte offset given.
699 */
700 nfsuint64 *
701 nfs_getcookie(struct nfsnode *np, off_t off, int add)
702 {
703 struct nfsdmap *dp, *dp2;
704 int pos;
705
706 pos = (uoff_t)off / NFS_DIRBLKSIZ;
707 if (pos == 0 || off < 0) {
708 #ifdef DIAGNOSTIC
709 if (add)
710 panic("nfs getcookie add at <= 0");
711 #endif
712 return (&nfs_nullcookie);
713 }
714 pos--;
715 dp = LIST_FIRST(&np->n_cookies);
716 if (!dp) {
717 if (add) {
718 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
719 M_NFSDIROFF, M_WAITOK);
720 dp->ndm_eocookie = 0;
721 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
722 } else
723 return (NULL);
724 }
725 while (pos >= NFSNUMCOOKIES) {
726 pos -= NFSNUMCOOKIES;
727 if (LIST_NEXT(dp, ndm_list)) {
728 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
729 pos >= dp->ndm_eocookie)
730 return (NULL);
731 dp = LIST_NEXT(dp, ndm_list);
732 } else if (add) {
733 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
734 M_NFSDIROFF, M_WAITOK);
735 dp2->ndm_eocookie = 0;
736 LIST_INSERT_AFTER(dp, dp2, ndm_list);
737 dp = dp2;
738 } else
739 return (NULL);
740 }
741 if (pos >= dp->ndm_eocookie) {
742 if (add)
743 dp->ndm_eocookie = pos + 1;
744 else
745 return (NULL);
746 }
747 return (&dp->ndm_cookies[pos]);
748 }
749
750 /*
751 * Invalidate cached directory information, except for the actual directory
752 * blocks (which are invalidated separately).
753 * Done mainly to avoid the use of stale offset cookies.
754 */
755 void
756 nfs_invaldir(struct vnode *vp)
757 {
758 struct nfsnode *np = VTONFS(vp);
759
760 #ifdef DIAGNOSTIC
761 if (vp->v_type != VDIR)
762 panic("nfs: invaldir not dir");
763 #endif
764 np->n_direofoffset = 0;
765 np->n_cookieverf.nfsuquad[0] = 0;
766 np->n_cookieverf.nfsuquad[1] = 0;
767 if (LIST_FIRST(&np->n_cookies))
768 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
769 }
770
771 /*
772 * The write verifier has changed (probably due to a server reboot), so all
773 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
774 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
775 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
776 * mount point.
777 *
778 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
779 * writes are not clusterable.
780 */
781 void
782 nfs_clearcommit(struct mount *mp)
783 {
784 struct vnode *vp, *nvp;
785 struct buf *bp, *nbp;
786 int s;
787
788 GIANT_REQUIRED;
789
790 s = splbio();
791 mtx_lock(&mntvnode_mtx);
792 loop:
793 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) {
794 if (vp->v_mount != mp) /* Paranoia */
795 goto loop;
796 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
797 VI_LOCK(vp);
798 mtx_unlock(&mntvnode_mtx);
799 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
800 nbp = TAILQ_NEXT(bp, b_vnbufs);
801 if (BUF_REFCNT(bp) == 0 &&
802 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
803 == (B_DELWRI | B_NEEDCOMMIT))
804 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
805 }
806 VI_UNLOCK(vp);
807 mtx_lock(&mntvnode_mtx);
808 }
809 mtx_unlock(&mntvnode_mtx);
810 splx(s);
811 }
812
813 /*
814 * Helper functions for former macros. Some of these should be
815 * moved to their callers.
816 */
817
818 int
819 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
820 struct mbuf **md, caddr_t *dpos)
821 {
822 struct nfsnode *ttnp;
823 struct vnode *ttvp;
824 nfsfh_t *ttfhp;
825 u_int32_t *tl;
826 int ttfhsize;
827 int t1;
828
829 if (v3) {
830 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
831 if (tl == NULL)
832 return EBADRPC;
833 *f = fxdr_unsigned(int, *tl);
834 } else
835 *f = 1;
836 if (*f) {
837 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
838 if (t1 != 0)
839 return t1;
840 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp);
841 if (t1 != 0)
842 return t1;
843 *v = NFSTOV(ttnp);
844 }
845 if (v3) {
846 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
847 if (tl == NULL)
848 return EBADRPC;
849 if (*f)
850 *f = fxdr_unsigned(int, *tl);
851 else if (fxdr_unsigned(int, *tl))
852 nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
853 }
854 if (*f) {
855 ttvp = *v;
856 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
857 if (t1)
858 return t1;
859 *v = ttvp;
860 }
861 return 0;
862 }
863
864 int
865 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
866 {
867 u_int32_t *tl;
868
869 if (v3) {
870 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
871 if (tl == NULL)
872 return EBADRPC;
873 *s = fxdr_unsigned(int, *tl);
874 if (*s <= 0 || *s > NFSX_V3FHMAX)
875 return EBADRPC;
876 } else
877 *s = NFSX_V2FH;
878 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
879 if (*f == NULL)
880 return EBADRPC;
881 else
882 return 0;
883 }
884
885
886 int
887 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
888 caddr_t *dpos)
889 {
890 int t1;
891
892 struct vnode *ttvp = *v;
893 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
894 if (t1 != 0)
895 return t1;
896 *v = ttvp;
897 return 0;
898 }
899
900 int
901 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
902 caddr_t *dpos)
903 {
904 u_int32_t *tl;
905 int t1;
906
907 struct vnode *ttvp = *v;
908 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
909 if (tl == NULL)
910 return EBADRPC;
911 *f = fxdr_unsigned(int, *tl);
912 if (*f != 0) {
913 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
914 if (t1 != 0) {
915 *f = 0;
916 return t1;
917 }
918 *v = ttvp;
919 }
920 return 0;
921 }
922
923 int
924 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
925 {
926 u_int32_t *tl;
927 int ttattrf, ttretf = 0;
928 int t1;
929
930 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
931 if (tl == NULL)
932 return EBADRPC;
933 if (*tl == nfs_true) {
934 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
935 if (tl == NULL)
936 return EBADRPC;
937 if (*f)
938 ttretf = (VTONFS(*v)->n_mtime ==
939 fxdr_unsigned(u_int32_t, *(tl + 2)));
940 }
941 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
942 if (t1)
943 return t1;
944 if (*f)
945 *f = ttretf;
946 else
947 *f = ttattrf;
948 return 0;
949 }
950
951 int
952 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
953 {
954 u_int32_t *tl;
955 int t1;
956
957 if (s > m)
958 return ENAMETOOLONG;
959 t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
960 if (t1 <= M_TRAILINGSPACE(*mb)) {
961 tl = nfsm_build_xx(t1, mb, bpos);
962 *tl++ = txdr_unsigned(s);
963 *(tl + ((t1 >> 2) - 2)) = 0;
964 bcopy(a, tl, s);
965 } else {
966 t1 = nfsm_strtmbuf(mb, bpos, a, s);
967 if (t1 != 0)
968 return t1;
969 }
970 return 0;
971 }
972
973 int
974 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
975 {
976 u_int32_t *tl;
977 int t1;
978 caddr_t cp;
979
980 if (v3) {
981 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
982 if (t1 < M_TRAILINGSPACE(*mb)) {
983 tl = nfsm_build_xx(t1, mb, bpos);
984 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
985 *(tl + ((t1 >> 2) - 2)) = 0;
986 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
987 } else {
988 t1 = nfsm_strtmbuf(mb, bpos,
989 (const char *)VTONFS(v)->n_fhp,
990 VTONFS(v)->n_fhsize);
991 if (t1 != 0)
992 return t1;
993 }
994 } else {
995 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
996 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
997 }
998 return 0;
999 }
1000
1001 void
1002 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
1003 caddr_t *bpos)
1004 {
1005 u_int32_t *tl;
1006
1007 if (va->va_mode != (mode_t)VNOVAL) {
1008 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1009 *tl++ = nfs_true;
1010 *tl = txdr_unsigned(va->va_mode);
1011 } else {
1012 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1013 *tl = nfs_false;
1014 }
1015 if (full && va->va_uid != (uid_t)VNOVAL) {
1016 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1017 *tl++ = nfs_true;
1018 *tl = txdr_unsigned(va->va_uid);
1019 } else {
1020 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1021 *tl = nfs_false;
1022 }
1023 if (full && va->va_gid != (gid_t)VNOVAL) {
1024 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1025 *tl++ = nfs_true;
1026 *tl = txdr_unsigned(va->va_gid);
1027 } else {
1028 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1029 *tl = nfs_false;
1030 }
1031 if (full && va->va_size != VNOVAL) {
1032 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1033 *tl++ = nfs_true;
1034 txdr_hyper(va->va_size, tl);
1035 } else {
1036 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1037 *tl = nfs_false;
1038 }
1039 if (va->va_atime.tv_sec != VNOVAL) {
1040 if (va->va_atime.tv_sec != time_second) {
1041 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1042 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1043 txdr_nfsv3time(&va->va_atime, tl);
1044 } else {
1045 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1046 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1047 }
1048 } else {
1049 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1050 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1051 }
1052 if (va->va_mtime.tv_sec != VNOVAL) {
1053 if (va->va_mtime.tv_sec != time_second) {
1054 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1055 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1056 txdr_nfsv3time(&va->va_mtime, tl);
1057 } else {
1058 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1059 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1060 }
1061 } else {
1062 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1063 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1064 }
1065 }
Cache object: e26500ddb8ae4a705667e38852e6fb3b
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