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 * from nfs_subs.c 8.8 (Berkeley) 5/22/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
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 #include <sys/taskqueue.h>
61
62 #include <vm/vm.h>
63 #include <vm/vm_object.h>
64 #include <vm/vm_extern.h>
65 #include <vm/uma.h>
66
67 #include <fs/nfs/nfsport.h>
68 #include <fs/nfsclient/nfsnode.h>
69 #include <fs/nfsclient/nfsmount.h>
70 #include <fs/nfsclient/nfs.h>
71 #include <fs/nfsclient/nfs_kdtrace.h>
72
73 #include <netinet/in.h>
74
75 /*
76 * Note that stdarg.h and the ANSI style va_start macro is used for both
77 * ANSI and traditional C compilers.
78 */
79 #include <machine/stdarg.h>
80
81 extern struct mtx ncl_iod_mutex;
82 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
83 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
84 extern int ncl_numasync;
85 extern unsigned int ncl_iodmax;
86 extern struct nfsstats newnfsstats;
87
88 struct task ncl_nfsiodnew_task;
89
90 int
ncl_uninit(struct vfsconf * vfsp)91 ncl_uninit(struct vfsconf *vfsp)
92 {
93 /*
94 * XXX: Unloading of nfscl module is unsupported.
95 */
96 #if 0
97 int i;
98
99 /*
100 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
101 * any sleeping nfsiods so they check ncl_iodmax and exit.
102 */
103 mtx_lock(&ncl_iod_mutex);
104 ncl_iodmax = 0;
105 for (i = 0; i < ncl_numasync; i++)
106 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
107 wakeup(&ncl_iodwant[i]);
108 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
109 while (ncl_numasync)
110 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
111 mtx_unlock(&ncl_iod_mutex);
112 ncl_nhuninit();
113 return (0);
114 #else
115 return (EOPNOTSUPP);
116 #endif
117 }
118
119 void
ncl_dircookie_lock(struct nfsnode * np)120 ncl_dircookie_lock(struct nfsnode *np)
121 {
122 mtx_lock(&np->n_mtx);
123 while (np->n_flag & NDIRCOOKIELK)
124 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
125 np->n_flag |= NDIRCOOKIELK;
126 mtx_unlock(&np->n_mtx);
127 }
128
129 void
ncl_dircookie_unlock(struct nfsnode * np)130 ncl_dircookie_unlock(struct nfsnode *np)
131 {
132 mtx_lock(&np->n_mtx);
133 np->n_flag &= ~NDIRCOOKIELK;
134 wakeup(&np->n_flag);
135 mtx_unlock(&np->n_mtx);
136 }
137
138 int
ncl_upgrade_vnlock(struct vnode * vp)139 ncl_upgrade_vnlock(struct vnode *vp)
140 {
141 int old_lock;
142
143 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
144 old_lock = NFSVOPISLOCKED(vp);
145 if (old_lock != LK_EXCLUSIVE) {
146 KASSERT(old_lock == LK_SHARED,
147 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
148 /* Upgrade to exclusive lock, this might block */
149 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
150 }
151 return (old_lock);
152 }
153
154 void
ncl_downgrade_vnlock(struct vnode * vp,int old_lock)155 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
156 {
157 if (old_lock != LK_EXCLUSIVE) {
158 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
159 /* Downgrade from exclusive lock. */
160 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY);
161 }
162 }
163
164 void
ncl_printf(const char * fmt,...)165 ncl_printf(const char *fmt, ...)
166 {
167 va_list ap;
168
169 mtx_lock(&Giant);
170 va_start(ap, fmt);
171 vprintf(fmt, ap);
172 va_end(ap);
173 mtx_unlock(&Giant);
174 }
175
176 #ifdef NFS_ACDEBUG
177 #include <sys/sysctl.h>
178 SYSCTL_DECL(_vfs_nfs);
179 static int nfs_acdebug;
180 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
181 #endif
182
183 /*
184 * Check the time stamp
185 * If the cache is valid, copy contents to *vap and return 0
186 * otherwise return an error
187 */
188 int
ncl_getattrcache(struct vnode * vp,struct vattr * vaper)189 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
190 {
191 struct nfsnode *np;
192 struct vattr *vap;
193 struct nfsmount *nmp;
194 int timeo, mustflush;
195
196 np = VTONFS(vp);
197 vap = &np->n_vattr.na_vattr;
198 nmp = VFSTONFS(vp->v_mount);
199 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */
200 #ifdef NFS_ACDEBUG
201 mtx_lock(&Giant); /* ncl_printf() */
202 #endif
203 mtx_lock(&np->n_mtx);
204 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
205 timeo = (time_second - np->n_mtime.tv_sec) / 10;
206
207 #ifdef NFS_ACDEBUG
208 if (nfs_acdebug>1)
209 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
210 #endif
211
212 if (vap->va_type == VDIR) {
213 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
214 timeo = nmp->nm_acdirmin;
215 else if (timeo > nmp->nm_acdirmax)
216 timeo = nmp->nm_acdirmax;
217 } else {
218 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
219 timeo = nmp->nm_acregmin;
220 else if (timeo > nmp->nm_acregmax)
221 timeo = nmp->nm_acregmax;
222 }
223
224 #ifdef NFS_ACDEBUG
225 if (nfs_acdebug > 2)
226 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
227 nmp->nm_acregmin, nmp->nm_acregmax,
228 nmp->nm_acdirmin, nmp->nm_acdirmax);
229
230 if (nfs_acdebug)
231 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
232 (time_second - np->n_attrstamp), timeo);
233 #endif
234
235 if ((time_second - np->n_attrstamp) >= timeo &&
236 (mustflush != 0 || np->n_attrstamp == 0)) {
237 newnfsstats.attrcache_misses++;
238 mtx_unlock(&np->n_mtx);
239 #ifdef NFS_ACDEBUG
240 mtx_unlock(&Giant); /* ncl_printf() */
241 #endif
242 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
243 return( ENOENT);
244 }
245 newnfsstats.attrcache_hits++;
246 if (vap->va_size != np->n_size) {
247 if (vap->va_type == VREG) {
248 if (np->n_flag & NMODIFIED) {
249 if (vap->va_size < np->n_size)
250 vap->va_size = np->n_size;
251 else
252 np->n_size = vap->va_size;
253 } else {
254 np->n_size = vap->va_size;
255 }
256 vnode_pager_setsize(vp, np->n_size);
257 } else {
258 np->n_size = vap->va_size;
259 }
260 }
261 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
262 if (np->n_flag & NCHG) {
263 if (np->n_flag & NACC)
264 vaper->va_atime = np->n_atim;
265 if (np->n_flag & NUPD)
266 vaper->va_mtime = np->n_mtim;
267 }
268 mtx_unlock(&np->n_mtx);
269 #ifdef NFS_ACDEBUG
270 mtx_unlock(&Giant); /* ncl_printf() */
271 #endif
272 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
273 return (0);
274 }
275
276 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
277 /*
278 * This function finds the directory cookie that corresponds to the
279 * logical byte offset given.
280 */
281 nfsuint64 *
ncl_getcookie(struct nfsnode * np,off_t off,int add)282 ncl_getcookie(struct nfsnode *np, off_t off, int add)
283 {
284 struct nfsdmap *dp, *dp2;
285 int pos;
286 nfsuint64 *retval = NULL;
287
288 pos = (uoff_t)off / NFS_DIRBLKSIZ;
289 if (pos == 0 || off < 0) {
290 KASSERT(!add, ("nfs getcookie add at <= 0"));
291 return (&nfs_nullcookie);
292 }
293 pos--;
294 dp = LIST_FIRST(&np->n_cookies);
295 if (!dp) {
296 if (add) {
297 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
298 M_NFSDIROFF, M_WAITOK);
299 dp->ndm_eocookie = 0;
300 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
301 } else
302 goto out;
303 }
304 while (pos >= NFSNUMCOOKIES) {
305 pos -= NFSNUMCOOKIES;
306 if (LIST_NEXT(dp, ndm_list)) {
307 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
308 pos >= dp->ndm_eocookie)
309 goto out;
310 dp = LIST_NEXT(dp, ndm_list);
311 } else if (add) {
312 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
313 M_NFSDIROFF, M_WAITOK);
314 dp2->ndm_eocookie = 0;
315 LIST_INSERT_AFTER(dp, dp2, ndm_list);
316 dp = dp2;
317 } else
318 goto out;
319 }
320 if (pos >= dp->ndm_eocookie) {
321 if (add)
322 dp->ndm_eocookie = pos + 1;
323 else
324 goto out;
325 }
326 retval = &dp->ndm_cookies[pos];
327 out:
328 return (retval);
329 }
330
331 /*
332 * Invalidate cached directory information, except for the actual directory
333 * blocks (which are invalidated separately).
334 * Done mainly to avoid the use of stale offset cookies.
335 */
336 void
ncl_invaldir(struct vnode * vp)337 ncl_invaldir(struct vnode *vp)
338 {
339 struct nfsnode *np = VTONFS(vp);
340
341 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
342 ncl_dircookie_lock(np);
343 np->n_direofoffset = 0;
344 np->n_cookieverf.nfsuquad[0] = 0;
345 np->n_cookieverf.nfsuquad[1] = 0;
346 if (LIST_FIRST(&np->n_cookies))
347 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
348 ncl_dircookie_unlock(np);
349 }
350
351 /*
352 * The write verifier has changed (probably due to a server reboot), so all
353 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
354 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
355 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
356 * mount point.
357 *
358 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
359 * writes are not clusterable.
360 */
361 void
ncl_clearcommit(struct mount * mp)362 ncl_clearcommit(struct mount *mp)
363 {
364 struct vnode *vp, *nvp;
365 struct buf *bp, *nbp;
366 struct bufobj *bo;
367
368 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
369 bo = &vp->v_bufobj;
370 vholdl(vp);
371 VI_UNLOCK(vp);
372 BO_LOCK(bo);
373 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
374 if (!BUF_ISLOCKED(bp) &&
375 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
376 == (B_DELWRI | B_NEEDCOMMIT))
377 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
378 }
379 BO_UNLOCK(bo);
380 vdrop(vp);
381 }
382 }
383
384 /*
385 * Called once to initialize data structures...
386 */
387 int
ncl_init(struct vfsconf * vfsp)388 ncl_init(struct vfsconf *vfsp)
389 {
390 int i;
391
392 /* Ensure async daemons disabled */
393 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
394 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
395 ncl_iodmount[i] = NULL;
396 }
397 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
398 ncl_nhinit(); /* Init the nfsnode table */
399
400 return (0);
401 }
402
403