1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from nfs_subs.c 8.8 (Berkeley) 5/22/95
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/12.0/sys/fs/nfsclient/nfs_clsubs.c 328417 2018-01-25 22:25:13Z cem $");
39
40 /*
41 * These functions support the macros and help fiddle mbuf chains for
42 * the nfs op functions. They do things like create the rpc header and
43 * copy data between mbuf chains and uio lists.
44 */
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 <fs/nfs/nfsport.h>
70 #include <fs/nfsclient/nfsnode.h>
71 #include <fs/nfsclient/nfsmount.h>
72 #include <fs/nfsclient/nfs.h>
73 #include <fs/nfsclient/nfs_kdtrace.h>
74
75 #include <netinet/in.h>
76
77 /*
78 * Note that stdarg.h and the ANSI style va_start macro is used for both
79 * ANSI and traditional C compilers.
80 */
81 #include <machine/stdarg.h>
82
83 extern struct mtx ncl_iod_mutex;
84 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
85 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
86 extern int ncl_numasync;
87 extern unsigned int ncl_iodmax;
88 extern struct nfsstatsv1 nfsstatsv1;
89
90 struct task ncl_nfsiodnew_task;
91
92 int
93 ncl_uninit(struct vfsconf *vfsp)
94 {
95 /*
96 * XXX: Unloading of nfscl module is unsupported.
97 */
98 #if 0
99 int i;
100
101 /*
102 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
103 * any sleeping nfsiods so they check ncl_iodmax and exit.
104 */
105 mtx_lock(&ncl_iod_mutex);
106 ncl_iodmax = 0;
107 for (i = 0; i < ncl_numasync; i++)
108 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
109 wakeup(&ncl_iodwant[i]);
110 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
111 while (ncl_numasync)
112 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
113 mtx_unlock(&ncl_iod_mutex);
114 ncl_nhuninit();
115 return (0);
116 #else
117 return (EOPNOTSUPP);
118 #endif
119 }
120
121 void
122 ncl_dircookie_lock(struct nfsnode *np)
123 {
124 mtx_lock(&np->n_mtx);
125 while (np->n_flag & NDIRCOOKIELK)
126 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
127 np->n_flag |= NDIRCOOKIELK;
128 mtx_unlock(&np->n_mtx);
129 }
130
131 void
132 ncl_dircookie_unlock(struct nfsnode *np)
133 {
134 mtx_lock(&np->n_mtx);
135 np->n_flag &= ~NDIRCOOKIELK;
136 wakeup(&np->n_flag);
137 mtx_unlock(&np->n_mtx);
138 }
139
140 bool
141 ncl_excl_start(struct vnode *vp)
142 {
143 struct nfsnode *np;
144 int vn_lk;
145
146 ASSERT_VOP_LOCKED(vp, "ncl_excl_start");
147 vn_lk = NFSVOPISLOCKED(vp);
148 if (vn_lk == LK_EXCLUSIVE)
149 return (false);
150 KASSERT(vn_lk == LK_SHARED,
151 ("ncl_excl_start: wrong vnode lock %d", vn_lk));
152 /* Ensure exclusive access, this might block */
153 np = VTONFS(vp);
154 lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL);
155 return (true);
156 }
157
158 void
159 ncl_excl_finish(struct vnode *vp, bool old_lock)
160 {
161 struct nfsnode *np;
162
163 if (!old_lock)
164 return;
165 np = VTONFS(vp);
166 lockmgr(&np->n_excl, LK_RELEASE, NULL);
167 }
168
169 #ifdef NFS_ACDEBUG
170 #include <sys/sysctl.h>
171 SYSCTL_DECL(_vfs_nfs);
172 static int nfs_acdebug;
173 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
174 #endif
175
176 /*
177 * Check the time stamp
178 * If the cache is valid, copy contents to *vap and return 0
179 * otherwise return an error
180 */
181 int
182 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
183 {
184 struct nfsnode *np;
185 struct vattr *vap;
186 struct nfsmount *nmp;
187 int timeo, mustflush;
188
189 np = VTONFS(vp);
190 vap = &np->n_vattr.na_vattr;
191 nmp = VFSTONFS(vp->v_mount);
192 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */
193 mtx_lock(&np->n_mtx);
194 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
195 timeo = (time_second - np->n_mtime.tv_sec) / 10;
196
197 #ifdef NFS_ACDEBUG
198 if (nfs_acdebug>1)
199 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
200 #endif
201
202 if (vap->va_type == VDIR) {
203 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
204 timeo = nmp->nm_acdirmin;
205 else if (timeo > nmp->nm_acdirmax)
206 timeo = nmp->nm_acdirmax;
207 } else {
208 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
209 timeo = nmp->nm_acregmin;
210 else if (timeo > nmp->nm_acregmax)
211 timeo = nmp->nm_acregmax;
212 }
213
214 #ifdef NFS_ACDEBUG
215 if (nfs_acdebug > 2)
216 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
217 nmp->nm_acregmin, nmp->nm_acregmax,
218 nmp->nm_acdirmin, nmp->nm_acdirmax);
219
220 if (nfs_acdebug)
221 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
222 (time_second - np->n_attrstamp), timeo);
223 #endif
224
225 if ((time_second - np->n_attrstamp) >= timeo &&
226 (mustflush != 0 || np->n_attrstamp == 0)) {
227 nfsstatsv1.attrcache_misses++;
228 mtx_unlock(&np->n_mtx);
229 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
230 return( ENOENT);
231 }
232 nfsstatsv1.attrcache_hits++;
233 if (vap->va_size != np->n_size) {
234 if (vap->va_type == VREG) {
235 if (np->n_flag & NMODIFIED) {
236 if (vap->va_size < np->n_size)
237 vap->va_size = np->n_size;
238 else
239 np->n_size = vap->va_size;
240 } else {
241 np->n_size = vap->va_size;
242 }
243 vnode_pager_setsize(vp, np->n_size);
244 } else {
245 np->n_size = vap->va_size;
246 }
247 }
248 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
249 if (np->n_flag & NCHG) {
250 if (np->n_flag & NACC)
251 vaper->va_atime = np->n_atim;
252 if (np->n_flag & NUPD)
253 vaper->va_mtime = np->n_mtim;
254 }
255 mtx_unlock(&np->n_mtx);
256 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
257 return (0);
258 }
259
260 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
261 /*
262 * This function finds the directory cookie that corresponds to the
263 * logical byte offset given.
264 */
265 nfsuint64 *
266 ncl_getcookie(struct nfsnode *np, off_t off, int add)
267 {
268 struct nfsdmap *dp, *dp2;
269 int pos;
270 nfsuint64 *retval = NULL;
271
272 pos = (uoff_t)off / NFS_DIRBLKSIZ;
273 if (pos == 0 || off < 0) {
274 KASSERT(!add, ("nfs getcookie add at <= 0"));
275 return (&nfs_nullcookie);
276 }
277 pos--;
278 dp = LIST_FIRST(&np->n_cookies);
279 if (!dp) {
280 if (add) {
281 dp = malloc(sizeof (struct nfsdmap),
282 M_NFSDIROFF, M_WAITOK);
283 dp->ndm_eocookie = 0;
284 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
285 } else
286 goto out;
287 }
288 while (pos >= NFSNUMCOOKIES) {
289 pos -= NFSNUMCOOKIES;
290 if (LIST_NEXT(dp, ndm_list)) {
291 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
292 pos >= dp->ndm_eocookie)
293 goto out;
294 dp = LIST_NEXT(dp, ndm_list);
295 } else if (add) {
296 dp2 = malloc(sizeof (struct nfsdmap),
297 M_NFSDIROFF, M_WAITOK);
298 dp2->ndm_eocookie = 0;
299 LIST_INSERT_AFTER(dp, dp2, ndm_list);
300 dp = dp2;
301 } else
302 goto out;
303 }
304 if (pos >= dp->ndm_eocookie) {
305 if (add)
306 dp->ndm_eocookie = pos + 1;
307 else
308 goto out;
309 }
310 retval = &dp->ndm_cookies[pos];
311 out:
312 return (retval);
313 }
314
315 /*
316 * Invalidate cached directory information, except for the actual directory
317 * blocks (which are invalidated separately).
318 * Done mainly to avoid the use of stale offset cookies.
319 */
320 void
321 ncl_invaldir(struct vnode *vp)
322 {
323 struct nfsnode *np = VTONFS(vp);
324
325 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
326 ncl_dircookie_lock(np);
327 np->n_direofoffset = 0;
328 np->n_cookieverf.nfsuquad[0] = 0;
329 np->n_cookieverf.nfsuquad[1] = 0;
330 if (LIST_FIRST(&np->n_cookies))
331 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
332 ncl_dircookie_unlock(np);
333 }
334
335 /*
336 * The write verifier has changed (probably due to a server reboot), so all
337 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
338 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
339 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
340 * mount point.
341 *
342 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
343 * writes are not clusterable.
344 */
345 void
346 ncl_clearcommit(struct mount *mp)
347 {
348 struct vnode *vp, *nvp;
349 struct buf *bp, *nbp;
350 struct bufobj *bo;
351
352 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
353 bo = &vp->v_bufobj;
354 vholdl(vp);
355 VI_UNLOCK(vp);
356 BO_LOCK(bo);
357 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
358 if (!BUF_ISLOCKED(bp) &&
359 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
360 == (B_DELWRI | B_NEEDCOMMIT))
361 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
362 }
363 BO_UNLOCK(bo);
364 vdrop(vp);
365 }
366 }
367
368 /*
369 * Called once to initialize data structures...
370 */
371 int
372 ncl_init(struct vfsconf *vfsp)
373 {
374 int i;
375
376 /* Ensure async daemons disabled */
377 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
378 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
379 ncl_iodmount[i] = NULL;
380 }
381 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
382 ncl_nhinit(); /* Init the nfsnode table */
383
384 return (0);
385 }
386
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