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/9.2/sys/nfsclient/nfs_subs.c 253177 2013-07-11 01:30:24Z rmacklem $");
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 "opt_kdtrace.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/bio.h>
50 #include <sys/buf.h>
51 #include <sys/proc.h>
52 #include <sys/mount.h>
53 #include <sys/vnode.h>
54 #include <sys/namei.h>
55 #include <sys/mbuf.h>
56 #include <sys/socket.h>
57 #include <sys/stat.h>
58 #include <sys/malloc.h>
59 #include <sys/sysent.h>
60 #include <sys/syscall.h>
61 #include <sys/sysproto.h>
62 #include <sys/taskqueue.h>
63
64 #include <vm/vm.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_extern.h>
67 #include <vm/uma.h>
68
69 #include <nfs/nfsproto.h>
70 #include <nfsclient/nfs.h>
71 #include <nfsclient/nfsnode.h>
72 #include <nfs/nfs_kdtrace.h>
73 #include <nfs/xdr_subs.h>
74 #include <nfsclient/nfsm_subs.h>
75 #include <nfsclient/nfsmount.h>
76
77 #include <netinet/in.h>
78
79 /*
80 * Note that stdarg.h and the ANSI style va_start macro is used for both
81 * ANSI and traditional C compilers.
82 */
83 #include <machine/stdarg.h>
84
85 #ifdef KDTRACE_HOOKS
86 dtrace_nfsclient_attrcache_flush_probe_func_t
87 dtrace_nfsclient_attrcache_flush_done_probe;
88 uint32_t nfsclient_attrcache_flush_done_id;
89
90 dtrace_nfsclient_attrcache_get_hit_probe_func_t
91 dtrace_nfsclient_attrcache_get_hit_probe;
92 uint32_t nfsclient_attrcache_get_hit_id;
93
94 dtrace_nfsclient_attrcache_get_miss_probe_func_t
95 dtrace_nfsclient_attrcache_get_miss_probe;
96 uint32_t nfsclient_attrcache_get_miss_id;
97
98 dtrace_nfsclient_attrcache_load_probe_func_t
99 dtrace_nfsclient_attrcache_load_done_probe;
100 uint32_t nfsclient_attrcache_load_done_id;
101 #endif /* !KDTRACE_HOOKS */
102
103 /*
104 * Data items converted to xdr at startup, since they are constant
105 * This is kinda hokey, but may save a little time doing byte swaps
106 */
107 u_int32_t nfs_xdrneg1;
108 u_int32_t nfs_true, nfs_false;
109
110 /* And other global data */
111 static u_int32_t nfs_xid = 0;
112 static enum vtype nv2tov_type[8]= {
113 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
114 };
115
116 int nfs_ticks;
117 int nfs_pbuf_freecnt = -1; /* start out unlimited */
118
119 struct nfs_bufq nfs_bufq;
120 static struct mtx nfs_xid_mtx;
121 struct task nfs_nfsiodnew_task;
122
123 /*
124 * and the reverse mapping from generic to Version 2 procedure numbers
125 */
126 int nfsv2_procid[NFS_NPROCS] = {
127 NFSV2PROC_NULL,
128 NFSV2PROC_GETATTR,
129 NFSV2PROC_SETATTR,
130 NFSV2PROC_LOOKUP,
131 NFSV2PROC_NOOP,
132 NFSV2PROC_READLINK,
133 NFSV2PROC_READ,
134 NFSV2PROC_WRITE,
135 NFSV2PROC_CREATE,
136 NFSV2PROC_MKDIR,
137 NFSV2PROC_SYMLINK,
138 NFSV2PROC_CREATE,
139 NFSV2PROC_REMOVE,
140 NFSV2PROC_RMDIR,
141 NFSV2PROC_RENAME,
142 NFSV2PROC_LINK,
143 NFSV2PROC_READDIR,
144 NFSV2PROC_NOOP,
145 NFSV2PROC_STATFS,
146 NFSV2PROC_NOOP,
147 NFSV2PROC_NOOP,
148 NFSV2PROC_NOOP,
149 NFSV2PROC_NOOP,
150 };
151
152 LIST_HEAD(nfsnodehashhead, nfsnode);
153
154 u_int32_t
155 nfs_xid_gen(void)
156 {
157 uint32_t xid;
158
159 mtx_lock(&nfs_xid_mtx);
160
161 /* Get a pretty random xid to start with */
162 if (!nfs_xid)
163 nfs_xid = random();
164 /*
165 * Skip zero xid if it should ever happen.
166 */
167 if (++nfs_xid == 0)
168 nfs_xid++;
169 xid = nfs_xid;
170 mtx_unlock(&nfs_xid_mtx);
171 return xid;
172 }
173
174 /*
175 * Create the header for an rpc request packet
176 * The hsiz is the size of the rest of the nfs request header.
177 * (just used to decide if a cluster is a good idea)
178 */
179 struct mbuf *
180 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
181 {
182 struct mbuf *mb;
183
184 MGET(mb, M_WAIT, MT_DATA);
185 if (hsiz >= MINCLSIZE)
186 MCLGET(mb, M_WAIT);
187 mb->m_len = 0;
188 return (mb);
189 }
190
191 /*
192 * copies a uio scatter/gather list to an mbuf chain.
193 * NOTE: can ony handle iovcnt == 1
194 */
195 int
196 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
197 {
198 char *uiocp;
199 struct mbuf *mp, *mp2;
200 int xfer, left, mlen;
201 int uiosiz, clflg, rem;
202 char *cp;
203
204 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
205
206 if (siz > MLEN) /* or should it >= MCLBYTES ?? */
207 clflg = 1;
208 else
209 clflg = 0;
210 rem = nfsm_rndup(siz)-siz;
211 mp = mp2 = *mq;
212 while (siz > 0) {
213 left = uiop->uio_iov->iov_len;
214 uiocp = uiop->uio_iov->iov_base;
215 if (left > siz)
216 left = siz;
217 uiosiz = left;
218 while (left > 0) {
219 mlen = M_TRAILINGSPACE(mp);
220 if (mlen == 0) {
221 MGET(mp, M_WAIT, MT_DATA);
222 if (clflg)
223 MCLGET(mp, M_WAIT);
224 mp->m_len = 0;
225 mp2->m_next = mp;
226 mp2 = mp;
227 mlen = M_TRAILINGSPACE(mp);
228 }
229 xfer = (left > mlen) ? mlen : left;
230 #ifdef notdef
231 /* Not Yet.. */
232 if (uiop->uio_iov->iov_op != NULL)
233 (*(uiop->uio_iov->iov_op))
234 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
235 else
236 #endif
237 if (uiop->uio_segflg == UIO_SYSSPACE)
238 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
239 else
240 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
241 mp->m_len += xfer;
242 left -= xfer;
243 uiocp += xfer;
244 uiop->uio_offset += xfer;
245 uiop->uio_resid -= xfer;
246 }
247 uiop->uio_iov->iov_base =
248 (char *)uiop->uio_iov->iov_base + uiosiz;
249 uiop->uio_iov->iov_len -= uiosiz;
250 siz -= uiosiz;
251 }
252 if (rem > 0) {
253 if (rem > M_TRAILINGSPACE(mp)) {
254 MGET(mp, M_WAIT, MT_DATA);
255 mp->m_len = 0;
256 mp2->m_next = mp;
257 }
258 cp = mtod(mp, caddr_t)+mp->m_len;
259 for (left = 0; left < rem; left++)
260 *cp++ = '\0';
261 mp->m_len += rem;
262 *bpos = cp;
263 } else
264 *bpos = mtod(mp, caddr_t)+mp->m_len;
265 *mq = mp;
266 return (0);
267 }
268
269 /*
270 * Copy a string into mbufs for the hard cases...
271 */
272 int
273 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
274 {
275 struct mbuf *m1 = NULL, *m2;
276 long left, xfer, len, tlen;
277 u_int32_t *tl;
278 int putsize;
279
280 putsize = 1;
281 m2 = *mb;
282 left = M_TRAILINGSPACE(m2);
283 if (left > 0) {
284 tl = ((u_int32_t *)(*bpos));
285 *tl++ = txdr_unsigned(siz);
286 putsize = 0;
287 left -= NFSX_UNSIGNED;
288 m2->m_len += NFSX_UNSIGNED;
289 if (left > 0) {
290 bcopy(cp, (caddr_t) tl, left);
291 siz -= left;
292 cp += left;
293 m2->m_len += left;
294 left = 0;
295 }
296 }
297 /* Loop around adding mbufs */
298 while (siz > 0) {
299 MGET(m1, M_WAIT, MT_DATA);
300 if (siz > MLEN)
301 MCLGET(m1, M_WAIT);
302 m1->m_len = NFSMSIZ(m1);
303 m2->m_next = m1;
304 m2 = m1;
305 tl = mtod(m1, u_int32_t *);
306 tlen = 0;
307 if (putsize) {
308 *tl++ = txdr_unsigned(siz);
309 m1->m_len -= NFSX_UNSIGNED;
310 tlen = NFSX_UNSIGNED;
311 putsize = 0;
312 }
313 if (siz < m1->m_len) {
314 len = nfsm_rndup(siz);
315 xfer = siz;
316 if (xfer < len)
317 *(tl+(xfer>>2)) = 0;
318 } else {
319 xfer = len = m1->m_len;
320 }
321 bcopy(cp, (caddr_t) tl, xfer);
322 m1->m_len = len+tlen;
323 siz -= xfer;
324 cp += xfer;
325 }
326 *mb = m1;
327 *bpos = mtod(m1, caddr_t)+m1->m_len;
328 return (0);
329 }
330
331 /*
332 * Called once to initialize data structures...
333 */
334 int
335 nfs_init(struct vfsconf *vfsp)
336 {
337 int i;
338
339 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
340 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
341 nfs_true = txdr_unsigned(TRUE);
342 nfs_false = txdr_unsigned(FALSE);
343 nfs_xdrneg1 = txdr_unsigned(-1);
344 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
345 if (nfs_ticks < 1)
346 nfs_ticks = 1;
347 /* Ensure async daemons disabled */
348 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
349 nfs_iodwant[i] = NFSIOD_NOT_AVAILABLE;
350 nfs_iodmount[i] = NULL;
351 }
352 nfs_nhinit(); /* Init the nfsnode table */
353
354 /*
355 * Initialize reply list and start timer
356 */
357 mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
358 mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
359 TASK_INIT(&nfs_nfsiodnew_task, 0, nfs_nfsiodnew_tq, NULL);
360
361 nfs_pbuf_freecnt = nswbuf / 2 + 1;
362
363 return (0);
364 }
365
366 int
367 nfs_uninit(struct vfsconf *vfsp)
368 {
369 int i;
370
371 /*
372 * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
373 * any sleeping nfsiods so they check nfs_iodmax and exit.
374 * Drain nfsiodnew task before we wait for them to finish.
375 */
376 mtx_lock(&nfs_iod_mtx);
377 nfs_iodmax = 0;
378 mtx_unlock(&nfs_iod_mtx);
379 taskqueue_drain(taskqueue_thread, &nfs_nfsiodnew_task);
380 mtx_lock(&nfs_iod_mtx);
381 for (i = 0; i < nfs_numasync; i++)
382 if (nfs_iodwant[i] == NFSIOD_AVAILABLE)
383 wakeup(&nfs_iodwant[i]);
384 /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
385 while (nfs_numasync)
386 msleep(&nfs_numasync, &nfs_iod_mtx, PWAIT, "ioddie", 0);
387 mtx_unlock(&nfs_iod_mtx);
388 nfs_nhuninit();
389 uma_zdestroy(nfsmount_zone);
390 return (0);
391 }
392
393 void
394 nfs_dircookie_lock(struct nfsnode *np)
395 {
396 mtx_lock(&np->n_mtx);
397 while (np->n_flag & NDIRCOOKIELK)
398 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
399 np->n_flag |= NDIRCOOKIELK;
400 mtx_unlock(&np->n_mtx);
401 }
402
403 void
404 nfs_dircookie_unlock(struct nfsnode *np)
405 {
406 mtx_lock(&np->n_mtx);
407 np->n_flag &= ~NDIRCOOKIELK;
408 wakeup(&np->n_flag);
409 mtx_unlock(&np->n_mtx);
410 }
411
412 int
413 nfs_upgrade_vnlock(struct vnode *vp)
414 {
415 int old_lock;
416
417 ASSERT_VOP_LOCKED(vp, "nfs_upgrade_vnlock");
418 old_lock = VOP_ISLOCKED(vp);
419 if (old_lock != LK_EXCLUSIVE) {
420 KASSERT(old_lock == LK_SHARED,
421 ("nfs_upgrade_vnlock: wrong old_lock %d", old_lock));
422 /* Upgrade to exclusive lock, this might block */
423 vn_lock(vp, LK_UPGRADE | LK_RETRY);
424 }
425 return (old_lock);
426 }
427
428 void
429 nfs_downgrade_vnlock(struct vnode *vp, int old_lock)
430 {
431 if (old_lock != LK_EXCLUSIVE) {
432 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
433 /* Downgrade from exclusive lock. */
434 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
435 }
436 }
437
438 void
439 nfs_printf(const char *fmt, ...)
440 {
441 va_list ap;
442
443 mtx_lock(&Giant);
444 va_start(ap, fmt);
445 vprintf(fmt, ap);
446 va_end(ap);
447 mtx_unlock(&Giant);
448 }
449
450 /*
451 * Attribute cache routines.
452 * nfs_loadattrcache() - loads or updates the cache contents from attributes
453 * that are on the mbuf list
454 * nfs_getattrcache() - returns valid attributes if found in cache, returns
455 * error otherwise
456 */
457
458 /*
459 * Load the attribute cache (that lives in the nfsnode entry) with
460 * the values on the mbuf list and
461 * Iff vap not NULL
462 * copy the attributes to *vaper
463 */
464 int
465 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
466 struct vattr *vaper, int dontshrink)
467 {
468 struct vnode *vp = *vpp;
469 struct vattr *vap;
470 struct nfs_fattr *fp;
471 struct nfsnode *np = NULL;
472 int32_t t1;
473 caddr_t cp2;
474 int rdev;
475 struct mbuf *md;
476 enum vtype vtyp;
477 u_short vmode;
478 struct timespec mtime, mtime_save;
479 int v3 = NFS_ISV3(vp);
480 int error = 0;
481 u_quad_t nsize;
482 int setnsize;
483
484 md = *mdp;
485 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
486 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_WAIT);
487 if (cp2 == NULL) {
488 error = EBADRPC;
489 goto out;
490 }
491 fp = (struct nfs_fattr *)cp2;
492 if (v3) {
493 vtyp = nfsv3tov_type(fp->fa_type);
494 vmode = fxdr_unsigned(u_short, fp->fa_mode);
495 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
496 fxdr_unsigned(int, fp->fa3_rdev.specdata2));
497 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
498 } else {
499 vtyp = nfsv2tov_type(fp->fa_type);
500 vmode = fxdr_unsigned(u_short, fp->fa_mode);
501 /*
502 * XXX
503 *
504 * The duplicate information returned in fa_type and fa_mode
505 * is an ambiguity in the NFS version 2 protocol.
506 *
507 * VREG should be taken literally as a regular file. If a
508 * server intents to return some type information differently
509 * in the upper bits of the mode field (e.g. for sockets, or
510 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
511 * leave the examination of the mode bits even in the VREG
512 * case to avoid breakage for bogus servers, but we make sure
513 * that there are actually type bits set in the upper part of
514 * fa_mode (and failing that, trust the va_type field).
515 *
516 * NFSv3 cleared the issue, and requires fa_mode to not
517 * contain any type information (while also introduing sockets
518 * and FIFOs for fa_type).
519 */
520 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
521 vtyp = IFTOVT(vmode);
522 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
523 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
524
525 /*
526 * Really ugly NFSv2 kludge.
527 */
528 if (vtyp == VCHR && rdev == 0xffffffff)
529 vtyp = VFIFO;
530 }
531
532 /*
533 * If v_type == VNON it is a new node, so fill in the v_type,
534 * n_mtime fields. Check to see if it represents a special
535 * device, and if so, check for a possible alias. Once the
536 * correct vnode has been obtained, fill in the rest of the
537 * information.
538 */
539 np = VTONFS(vp);
540 mtx_lock(&np->n_mtx);
541 if (vp->v_type != vtyp) {
542 vp->v_type = vtyp;
543 if (vp->v_type == VFIFO)
544 vp->v_op = &nfs_fifoops;
545 np->n_mtime = mtime;
546 }
547 vap = &np->n_vattr;
548 vap->va_type = vtyp;
549 vap->va_mode = (vmode & 07777);
550 vap->va_rdev = rdev;
551 mtime_save = vap->va_mtime;
552 vap->va_mtime = mtime;
553 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
554 if (v3) {
555 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
556 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
557 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
558 vap->va_size = fxdr_hyper(&fp->fa3_size);
559 vap->va_blocksize = NFS_FABLKSIZE;
560 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
561 vap->va_fileid = fxdr_unsigned(int32_t,
562 fp->fa3_fileid.nfsuquad[1]);
563 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
564 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
565 vap->va_flags = 0;
566 vap->va_filerev = 0;
567 } else {
568 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
569 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
570 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
571 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
572 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
573 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
574 * NFS_FABLKSIZE;
575 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
576 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
577 vap->va_flags = 0;
578 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
579 fp->fa2_ctime.nfsv2_sec);
580 vap->va_ctime.tv_nsec = 0;
581 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
582 vap->va_filerev = 0;
583 }
584 np->n_attrstamp = time_second;
585 setnsize = 0;
586 nsize = 0;
587 if (vap->va_size != np->n_size) {
588 if (vap->va_type == VREG) {
589 if (dontshrink && vap->va_size < np->n_size) {
590 /*
591 * We've been told not to shrink the file;
592 * zero np->n_attrstamp to indicate that
593 * the attributes are stale.
594 */
595 vap->va_size = np->n_size;
596 np->n_attrstamp = 0;
597 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
598 vnode_pager_setsize(vp, np->n_size);
599 } else if (np->n_flag & NMODIFIED) {
600 /*
601 * We've modified the file: Use the larger
602 * of our size, and the server's size.
603 */
604 if (vap->va_size < np->n_size) {
605 vap->va_size = np->n_size;
606 } else {
607 np->n_size = vap->va_size;
608 np->n_flag |= NSIZECHANGED;
609 }
610 vnode_pager_setsize(vp, np->n_size);
611 } else if (vap->va_size < np->n_size) {
612 /*
613 * When shrinking the size, the call to
614 * vnode_pager_setsize() cannot be done
615 * with the mutex held, so delay it until
616 * after the mtx_unlock call.
617 */
618 nsize = np->n_size = vap->va_size;
619 np->n_flag |= NSIZECHANGED;
620 setnsize = 1;
621 } else {
622 np->n_size = vap->va_size;
623 np->n_flag |= NSIZECHANGED;
624 vnode_pager_setsize(vp, np->n_size);
625 }
626 } else {
627 np->n_size = vap->va_size;
628 }
629 }
630 /*
631 * The following checks are added to prevent a race between (say)
632 * a READDIR+ and a WRITE.
633 * READDIR+, WRITE requests sent out.
634 * READDIR+ resp, WRITE resp received on client.
635 * However, the WRITE resp was handled before the READDIR+ resp
636 * causing the post op attrs from the write to be loaded first
637 * and the attrs from the READDIR+ to be loaded later. If this
638 * happens, we have stale attrs loaded into the attrcache.
639 * We detect this by for the mtime moving back. We invalidate the
640 * attrcache when this happens.
641 */
642 if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
643 /* Size changed or mtime went backwards */
644 np->n_attrstamp = 0;
645 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
646 }
647 if (vaper != NULL) {
648 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
649 if (np->n_flag & NCHG) {
650 if (np->n_flag & NACC)
651 vaper->va_atime = np->n_atim;
652 if (np->n_flag & NUPD)
653 vaper->va_mtime = np->n_mtim;
654 }
655 }
656
657 #ifdef KDTRACE_HOOKS
658 if (np->n_attrstamp != 0)
659 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, &np->n_vattr, 0);
660 #endif
661 mtx_unlock(&np->n_mtx);
662 if (setnsize)
663 vnode_pager_setsize(vp, nsize);
664 out:
665 #ifdef KDTRACE_HOOKS
666 if (error)
667 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, NULL, error);
668 #endif
669 return (error);
670 }
671
672 #ifdef NFS_ACDEBUG
673 #include <sys/sysctl.h>
674 SYSCTL_DECL(_vfs_oldnfs);
675 static int nfs_acdebug;
676 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0,
677 "Toggle acdebug (attribute cache debug) flag");
678 #endif
679
680 /*
681 * Check the time stamp
682 * If the cache is valid, copy contents to *vap and return 0
683 * otherwise return an error
684 */
685 int
686 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
687 {
688 struct nfsnode *np;
689 struct vattr *vap;
690 struct nfsmount *nmp;
691 int timeo;
692
693 np = VTONFS(vp);
694 vap = &np->n_vattr;
695 nmp = VFSTONFS(vp->v_mount);
696 #ifdef NFS_ACDEBUG
697 mtx_lock(&Giant); /* nfs_printf() */
698 #endif
699 mtx_lock(&np->n_mtx);
700 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
701 timeo = (time_second - np->n_mtime.tv_sec) / 10;
702
703 #ifdef NFS_ACDEBUG
704 if (nfs_acdebug>1)
705 nfs_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
706 #endif
707
708 if (vap->va_type == VDIR) {
709 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
710 timeo = nmp->nm_acdirmin;
711 else if (timeo > nmp->nm_acdirmax)
712 timeo = nmp->nm_acdirmax;
713 } else {
714 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
715 timeo = nmp->nm_acregmin;
716 else if (timeo > nmp->nm_acregmax)
717 timeo = nmp->nm_acregmax;
718 }
719
720 #ifdef NFS_ACDEBUG
721 if (nfs_acdebug > 2)
722 nfs_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
723 nmp->nm_acregmin, nmp->nm_acregmax,
724 nmp->nm_acdirmin, nmp->nm_acdirmax);
725
726 if (nfs_acdebug)
727 nfs_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
728 (time_second - np->n_attrstamp), timeo);
729 #endif
730
731 if ((time_second - np->n_attrstamp) >= timeo) {
732 nfsstats.attrcache_misses++;
733 mtx_unlock(&np->n_mtx);
734 #ifdef NFS_ACDEBUG
735 mtx_unlock(&Giant); /* nfs_printf() */
736 #endif
737 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
738 return (ENOENT);
739 }
740 nfsstats.attrcache_hits++;
741 if (vap->va_size != np->n_size) {
742 if (vap->va_type == VREG) {
743 if (np->n_flag & NMODIFIED) {
744 if (vap->va_size < np->n_size)
745 vap->va_size = np->n_size;
746 else
747 np->n_size = vap->va_size;
748 } else {
749 np->n_size = vap->va_size;
750 }
751 vnode_pager_setsize(vp, np->n_size);
752 } else {
753 np->n_size = vap->va_size;
754 }
755 }
756 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
757 if (np->n_flag & NCHG) {
758 if (np->n_flag & NACC)
759 vaper->va_atime = np->n_atim;
760 if (np->n_flag & NUPD)
761 vaper->va_mtime = np->n_mtim;
762 }
763 mtx_unlock(&np->n_mtx);
764 #ifdef NFS_ACDEBUG
765 mtx_unlock(&Giant); /* nfs_printf() */
766 #endif
767 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
768 return (0);
769 }
770
771 /*
772 * Purge all cached information about an NFS vnode including name
773 * cache entries, the attribute cache, and the access cache. This is
774 * called when an NFS request for a node fails with a stale
775 * filehandle.
776 */
777 void
778 nfs_purgecache(struct vnode *vp)
779 {
780 struct nfsnode *np;
781 int i;
782
783 np = VTONFS(vp);
784 cache_purge(vp);
785 mtx_lock(&np->n_mtx);
786 np->n_attrstamp = 0;
787 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
788 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
789 np->n_accesscache[i].stamp = 0;
790 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
791 mtx_unlock(&np->n_mtx);
792 }
793
794 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
795 /*
796 * This function finds the directory cookie that corresponds to the
797 * logical byte offset given.
798 */
799 nfsuint64 *
800 nfs_getcookie(struct nfsnode *np, off_t off, int add)
801 {
802 struct nfsdmap *dp, *dp2;
803 int pos;
804 nfsuint64 *retval = NULL;
805
806 pos = (uoff_t)off / NFS_DIRBLKSIZ;
807 if (pos == 0 || off < 0) {
808 KASSERT(!add, ("nfs getcookie add at <= 0"));
809 return (&nfs_nullcookie);
810 }
811 pos--;
812 dp = LIST_FIRST(&np->n_cookies);
813 if (!dp) {
814 if (add) {
815 dp = malloc(sizeof (struct nfsdmap),
816 M_NFSDIROFF, M_WAITOK);
817 dp->ndm_eocookie = 0;
818 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
819 } else
820 goto out;
821 }
822 while (pos >= NFSNUMCOOKIES) {
823 pos -= NFSNUMCOOKIES;
824 if (LIST_NEXT(dp, ndm_list)) {
825 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
826 pos >= dp->ndm_eocookie)
827 goto out;
828 dp = LIST_NEXT(dp, ndm_list);
829 } else if (add) {
830 dp2 = malloc(sizeof (struct nfsdmap),
831 M_NFSDIROFF, M_WAITOK);
832 dp2->ndm_eocookie = 0;
833 LIST_INSERT_AFTER(dp, dp2, ndm_list);
834 dp = dp2;
835 } else
836 goto out;
837 }
838 if (pos >= dp->ndm_eocookie) {
839 if (add)
840 dp->ndm_eocookie = pos + 1;
841 else
842 goto out;
843 }
844 retval = &dp->ndm_cookies[pos];
845 out:
846 return (retval);
847 }
848
849 /*
850 * Invalidate cached directory information, except for the actual directory
851 * blocks (which are invalidated separately).
852 * Done mainly to avoid the use of stale offset cookies.
853 */
854 void
855 nfs_invaldir(struct vnode *vp)
856 {
857 struct nfsnode *np = VTONFS(vp);
858
859 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
860 nfs_dircookie_lock(np);
861 np->n_direofoffset = 0;
862 np->n_cookieverf.nfsuquad[0] = 0;
863 np->n_cookieverf.nfsuquad[1] = 0;
864 if (LIST_FIRST(&np->n_cookies))
865 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
866 nfs_dircookie_unlock(np);
867 }
868
869 /*
870 * The write verifier has changed (probably due to a server reboot), so all
871 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
872 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
873 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
874 * mount point.
875 *
876 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
877 * writes are not clusterable.
878 */
879 void
880 nfs_clearcommit(struct mount *mp)
881 {
882 struct vnode *vp, *nvp;
883 struct buf *bp, *nbp;
884 struct bufobj *bo;
885
886 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
887 bo = &vp->v_bufobj;
888 vholdl(vp);
889 VI_UNLOCK(vp);
890 BO_LOCK(bo);
891 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
892 if (!BUF_ISLOCKED(bp) &&
893 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
894 == (B_DELWRI | B_NEEDCOMMIT))
895 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
896 }
897 BO_UNLOCK(bo);
898 vdrop(vp);
899 }
900 }
901
902 /*
903 * Helper functions for former macros. Some of these should be
904 * moved to their callers.
905 */
906
907 int
908 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
909 struct mbuf **md, caddr_t *dpos)
910 {
911 struct nfsnode *ttnp;
912 struct vnode *ttvp;
913 nfsfh_t *ttfhp;
914 u_int32_t *tl;
915 int ttfhsize;
916 int t1;
917
918 if (v3) {
919 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
920 if (tl == NULL)
921 return EBADRPC;
922 *f = fxdr_unsigned(int, *tl);
923 } else
924 *f = 1;
925 if (*f) {
926 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
927 if (t1 != 0)
928 return t1;
929 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE);
930 if (t1 != 0)
931 return t1;
932 *v = NFSTOV(ttnp);
933 }
934 if (v3) {
935 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
936 if (tl == NULL)
937 return EBADRPC;
938 if (*f)
939 *f = fxdr_unsigned(int, *tl);
940 else if (fxdr_unsigned(int, *tl))
941 nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
942 }
943 if (*f) {
944 ttvp = *v;
945 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
946 if (t1)
947 return t1;
948 *v = ttvp;
949 }
950 return 0;
951 }
952
953 int
954 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
955 {
956 u_int32_t *tl;
957
958 if (v3) {
959 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
960 if (tl == NULL)
961 return EBADRPC;
962 *s = fxdr_unsigned(int, *tl);
963 if (*s <= 0 || *s > NFSX_V3FHMAX)
964 return EBADRPC;
965 } else
966 *s = NFSX_V2FH;
967 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
968 if (*f == NULL)
969 return EBADRPC;
970 else
971 return 0;
972 }
973
974
975 int
976 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
977 caddr_t *dpos)
978 {
979 int t1;
980
981 struct vnode *ttvp = *v;
982 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
983 if (t1 != 0)
984 return t1;
985 *v = ttvp;
986 return 0;
987 }
988
989 int
990 nfsm_postop_attr_xx(struct vnode **v, int *f, struct vattr *va,
991 struct mbuf **md, caddr_t *dpos)
992 {
993 u_int32_t *tl;
994 int t1;
995
996 struct vnode *ttvp = *v;
997 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
998 if (tl == NULL)
999 return EBADRPC;
1000 *f = fxdr_unsigned(int, *tl);
1001 if (*f != 0) {
1002 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 1);
1003 if (t1 != 0) {
1004 *f = 0;
1005 return t1;
1006 }
1007 *v = ttvp;
1008 }
1009 return 0;
1010 }
1011
1012 int
1013 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
1014 {
1015 u_int32_t *tl;
1016 int ttattrf, ttretf = 0;
1017 int t1;
1018
1019 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
1020 if (tl == NULL)
1021 return EBADRPC;
1022 if (*tl == nfs_true) {
1023 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
1024 if (tl == NULL)
1025 return EBADRPC;
1026 mtx_lock(&(VTONFS(*v))->n_mtx);
1027 if (*f)
1028 ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) &&
1029 VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3)));
1030 mtx_unlock(&(VTONFS(*v))->n_mtx);
1031 }
1032 t1 = nfsm_postop_attr_xx(v, &ttattrf, NULL, md, dpos);
1033 if (t1)
1034 return t1;
1035 if (*f)
1036 *f = ttretf;
1037 else
1038 *f = ttattrf;
1039 return 0;
1040 }
1041
1042 int
1043 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
1044 {
1045 u_int32_t *tl;
1046 int t1;
1047
1048 if (s > m)
1049 return ENAMETOOLONG;
1050 t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
1051 if (t1 <= M_TRAILINGSPACE(*mb)) {
1052 tl = nfsm_build_xx(t1, mb, bpos);
1053 *tl++ = txdr_unsigned(s);
1054 *(tl + ((t1 >> 2) - 2)) = 0;
1055 bcopy(a, tl, s);
1056 } else {
1057 t1 = nfsm_strtmbuf(mb, bpos, a, s);
1058 if (t1 != 0)
1059 return t1;
1060 }
1061 return 0;
1062 }
1063
1064 int
1065 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
1066 {
1067 u_int32_t *tl;
1068 int t1;
1069 caddr_t cp;
1070
1071 if (v3) {
1072 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
1073 if (t1 < M_TRAILINGSPACE(*mb)) {
1074 tl = nfsm_build_xx(t1, mb, bpos);
1075 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
1076 *(tl + ((t1 >> 2) - 2)) = 0;
1077 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
1078 } else {
1079 t1 = nfsm_strtmbuf(mb, bpos,
1080 (const char *)VTONFS(v)->n_fhp,
1081 VTONFS(v)->n_fhsize);
1082 if (t1 != 0)
1083 return t1;
1084 }
1085 } else {
1086 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
1087 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
1088 }
1089 return 0;
1090 }
1091
1092 void
1093 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
1094 caddr_t *bpos)
1095 {
1096 u_int32_t *tl;
1097
1098 if (va->va_mode != (mode_t)VNOVAL) {
1099 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1100 *tl++ = nfs_true;
1101 *tl = txdr_unsigned(va->va_mode);
1102 } else {
1103 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1104 *tl = nfs_false;
1105 }
1106 if (full && va->va_uid != (uid_t)VNOVAL) {
1107 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1108 *tl++ = nfs_true;
1109 *tl = txdr_unsigned(va->va_uid);
1110 } else {
1111 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1112 *tl = nfs_false;
1113 }
1114 if (full && va->va_gid != (gid_t)VNOVAL) {
1115 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
1116 *tl++ = nfs_true;
1117 *tl = txdr_unsigned(va->va_gid);
1118 } else {
1119 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1120 *tl = nfs_false;
1121 }
1122 if (full && va->va_size != VNOVAL) {
1123 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1124 *tl++ = nfs_true;
1125 txdr_hyper(va->va_size, tl);
1126 } else {
1127 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1128 *tl = nfs_false;
1129 }
1130 if (va->va_atime.tv_sec != VNOVAL) {
1131 if ((va->va_vaflags & VA_UTIMES_NULL) == 0) {
1132 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1133 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1134 txdr_nfsv3time(&va->va_atime, tl);
1135 } else {
1136 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1137 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1138 }
1139 } else {
1140 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1141 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1142 }
1143 if (va->va_mtime.tv_sec != VNOVAL) {
1144 if ((va->va_vaflags & VA_UTIMES_NULL) == 0) {
1145 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
1146 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
1147 txdr_nfsv3time(&va->va_mtime, tl);
1148 } else {
1149 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1150 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
1151 }
1152 } else {
1153 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
1154 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
1155 }
1156 }
Cache object: 9a76457583f1b7756e7e186d8dbbbd9a
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