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: releng/8.1/sys/fs/nfsclient/nfs_clsubs.c 208432 2010-05-23 02:55:59Z 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 <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 <fs/nfs/nfsport.h>
67 #include <fs/nfsclient/nfsnode.h>
68 #include <fs/nfsclient/nfsmount.h>
69 #include <fs/nfsclient/nfs.h>
70 #include <fs/nfsclient/nfs_lock.h>
71
72 #include <netinet/in.h>
73
74 /*
75 * Note that stdarg.h and the ANSI style va_start macro is used for both
76 * ANSI and traditional C compilers.
77 */
78 #include <machine/stdarg.h>
79
80 extern struct mtx ncl_iod_mutex;
81 extern enum nfsiod_state ncl_iodwant[NFS_MAXRAHEAD];
82 extern struct nfsmount *ncl_iodmount[NFS_MAXRAHEAD];
83 extern int ncl_numasync;
84 extern unsigned int ncl_iodmax;
85 extern struct nfsstats newnfsstats;
86
87 int
88 ncl_uninit(struct vfsconf *vfsp)
89 {
90 /*
91 * XXX: Unloading of nfscl module is unsupported.
92 */
93 #if 0
94 int i;
95
96 /*
97 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
98 * any sleeping nfsiods so they check ncl_iodmax and exit.
99 */
100 mtx_lock(&ncl_iod_mutex);
101 ncl_iodmax = 0;
102 for (i = 0; i < ncl_numasync; i++)
103 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
104 wakeup(&ncl_iodwant[i]);
105 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
106 while (ncl_numasync)
107 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
108 mtx_unlock(&ncl_iod_mutex);
109 ncl_nhuninit();
110 return (0);
111 #else
112 return (EOPNOTSUPP);
113 #endif
114 }
115
116 void
117 ncl_dircookie_lock(struct nfsnode *np)
118 {
119 mtx_lock(&np->n_mtx);
120 while (np->n_flag & NDIRCOOKIELK)
121 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
122 np->n_flag |= NDIRCOOKIELK;
123 mtx_unlock(&np->n_mtx);
124 }
125
126 void
127 ncl_dircookie_unlock(struct nfsnode *np)
128 {
129 mtx_lock(&np->n_mtx);
130 np->n_flag &= ~NDIRCOOKIELK;
131 wakeup(&np->n_flag);
132 mtx_unlock(&np->n_mtx);
133 }
134
135 int
136 ncl_upgrade_vnlock(struct vnode *vp)
137 {
138 int old_lock;
139
140 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
141 old_lock = VOP_ISLOCKED(vp);
142 if (old_lock != LK_EXCLUSIVE) {
143 KASSERT(old_lock == LK_SHARED,
144 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
145 /* Upgrade to exclusive lock, this might block */
146 vn_lock(vp, LK_UPGRADE | LK_RETRY);
147 }
148 return (old_lock);
149 }
150
151 void
152 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
153 {
154 if (old_lock != LK_EXCLUSIVE) {
155 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
156 /* Downgrade from exclusive lock. */
157 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
158 }
159 }
160
161 void
162 ncl_printf(const char *fmt, ...)
163 {
164 va_list ap;
165
166 mtx_lock(&Giant);
167 va_start(ap, fmt);
168 printf(fmt, ap);
169 va_end(ap);
170 mtx_unlock(&Giant);
171 }
172
173 #ifdef NFS_ACDEBUG
174 #include <sys/sysctl.h>
175 SYSCTL_DECL(_vfs_newnfs);
176 static int nfs_acdebug;
177 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
178 #endif
179
180 /*
181 * Check the time stamp
182 * If the cache is valid, copy contents to *vap and return 0
183 * otherwise return an error
184 */
185 int
186 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
187 {
188 struct nfsnode *np;
189 struct vattr *vap;
190 struct nfsmount *nmp;
191 int timeo, mustflush;
192
193 np = VTONFS(vp);
194 vap = &np->n_vattr.na_vattr;
195 nmp = VFSTONFS(vp->v_mount);
196 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */
197 #ifdef NFS_ACDEBUG
198 mtx_lock(&Giant); /* ncl_printf() */
199 #endif
200 mtx_lock(&np->n_mtx);
201 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
202 timeo = (time_second - np->n_mtime.tv_sec) / 10;
203
204 #ifdef NFS_ACDEBUG
205 if (nfs_acdebug>1)
206 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
207 #endif
208
209 if (vap->va_type == VDIR) {
210 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
211 timeo = nmp->nm_acdirmin;
212 else if (timeo > nmp->nm_acdirmax)
213 timeo = nmp->nm_acdirmax;
214 } else {
215 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
216 timeo = nmp->nm_acregmin;
217 else if (timeo > nmp->nm_acregmax)
218 timeo = nmp->nm_acregmax;
219 }
220
221 #ifdef NFS_ACDEBUG
222 if (nfs_acdebug > 2)
223 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
224 nmp->nm_acregmin, nmp->nm_acregmax,
225 nmp->nm_acdirmin, nmp->nm_acdirmax);
226
227 if (nfs_acdebug)
228 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
229 (time_second - np->n_attrstamp), timeo);
230 #endif
231
232 if ((time_second - np->n_attrstamp) >= timeo &&
233 mustflush != 0) {
234 newnfsstats.attrcache_misses++;
235 mtx_unlock(&np->n_mtx);
236 #ifdef NFS_ACDEBUG
237 mtx_unlock(&Giant); /* ncl_printf() */
238 #endif
239 return( ENOENT);
240 }
241 newnfsstats.attrcache_hits++;
242 if (vap->va_size != np->n_size) {
243 if (vap->va_type == VREG) {
244 if (np->n_flag & NMODIFIED) {
245 if (vap->va_size < np->n_size)
246 vap->va_size = np->n_size;
247 else
248 np->n_size = vap->va_size;
249 } else {
250 np->n_size = vap->va_size;
251 }
252 vnode_pager_setsize(vp, np->n_size);
253 } else {
254 np->n_size = vap->va_size;
255 }
256 }
257 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
258 if (np->n_flag & NCHG) {
259 if (np->n_flag & NACC)
260 vaper->va_atime = np->n_atim;
261 if (np->n_flag & NUPD)
262 vaper->va_mtime = np->n_mtim;
263 }
264 mtx_unlock(&np->n_mtx);
265 #ifdef NFS_ACDEBUG
266 mtx_unlock(&Giant); /* ncl_printf() */
267 #endif
268 return (0);
269 }
270
271 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
272 /*
273 * This function finds the directory cookie that corresponds to the
274 * logical byte offset given.
275 */
276 nfsuint64 *
277 ncl_getcookie(struct nfsnode *np, off_t off, int add)
278 {
279 struct nfsdmap *dp, *dp2;
280 int pos;
281 nfsuint64 *retval = NULL;
282
283 pos = (uoff_t)off / NFS_DIRBLKSIZ;
284 if (pos == 0 || off < 0) {
285 #ifdef DIAGNOSTIC
286 if (add)
287 panic("nfs getcookie add at <= 0");
288 #endif
289 return (&nfs_nullcookie);
290 }
291 pos--;
292 dp = LIST_FIRST(&np->n_cookies);
293 if (!dp) {
294 if (add) {
295 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
296 M_NFSDIROFF, M_WAITOK);
297 dp->ndm_eocookie = 0;
298 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
299 } else
300 goto out;
301 }
302 while (pos >= NFSNUMCOOKIES) {
303 pos -= NFSNUMCOOKIES;
304 if (LIST_NEXT(dp, ndm_list)) {
305 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
306 pos >= dp->ndm_eocookie)
307 goto out;
308 dp = LIST_NEXT(dp, ndm_list);
309 } else if (add) {
310 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
311 M_NFSDIROFF, M_WAITOK);
312 dp2->ndm_eocookie = 0;
313 LIST_INSERT_AFTER(dp, dp2, ndm_list);
314 dp = dp2;
315 } else
316 goto out;
317 }
318 if (pos >= dp->ndm_eocookie) {
319 if (add)
320 dp->ndm_eocookie = pos + 1;
321 else
322 goto out;
323 }
324 retval = &dp->ndm_cookies[pos];
325 out:
326 return (retval);
327 }
328
329 /*
330 * Invalidate cached directory information, except for the actual directory
331 * blocks (which are invalidated separately).
332 * Done mainly to avoid the use of stale offset cookies.
333 */
334 void
335 ncl_invaldir(struct vnode *vp)
336 {
337 struct nfsnode *np = VTONFS(vp);
338
339 #ifdef DIAGNOSTIC
340 if (vp->v_type != VDIR)
341 panic("nfs: invaldir not dir");
342 #endif
343 ncl_dircookie_lock(np);
344 np->n_direofoffset = 0;
345 np->n_cookieverf.nfsuquad[0] = 0;
346 np->n_cookieverf.nfsuquad[1] = 0;
347 if (LIST_FIRST(&np->n_cookies))
348 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
349 ncl_dircookie_unlock(np);
350 }
351
352 /*
353 * The write verifier has changed (probably due to a server reboot), so all
354 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
355 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
356 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
357 * mount point.
358 *
359 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
360 * writes are not clusterable.
361 */
362 void
363 ncl_clearcommit(struct mount *mp)
364 {
365 struct vnode *vp, *nvp;
366 struct buf *bp, *nbp;
367 struct bufobj *bo;
368
369 MNT_ILOCK(mp);
370 MNT_VNODE_FOREACH(vp, mp, nvp) {
371 bo = &vp->v_bufobj;
372 VI_LOCK(vp);
373 if (vp->v_iflag & VI_DOOMED) {
374 VI_UNLOCK(vp);
375 continue;
376 }
377 vholdl(vp);
378 VI_UNLOCK(vp);
379 MNT_IUNLOCK(mp);
380 BO_LOCK(bo);
381 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
382 if (!BUF_ISLOCKED(bp) &&
383 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
384 == (B_DELWRI | B_NEEDCOMMIT))
385 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
386 }
387 BO_UNLOCK(bo);
388 vdrop(vp);
389 MNT_ILOCK(mp);
390 }
391 MNT_IUNLOCK(mp);
392 }
393
394 /*
395 * Called once to initialize data structures...
396 */
397 int
398 ncl_init(struct vfsconf *vfsp)
399 {
400 int i;
401
402 /* Ensure async daemons disabled */
403 for (i = 0; i < NFS_MAXRAHEAD; i++) {
404 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
405 ncl_iodmount[i] = NULL;
406 }
407 ncl_nhinit(); /* Init the nfsnode table */
408
409 return (0);
410 }
411
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