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>
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36__FBSDID("$FreeBSD: head/sys/fs/nfsclient/nfs_clsubs.c 221429 2011-05-04 11:22:52Z ru $");
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| 36__FBSDID("$FreeBSD: head/sys/fs/nfsclient/nfs_clsubs.c 221973 2011-05-15 20:52:43Z 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#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
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
80extern struct mtx ncl_iod_mutex;
81extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
82extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
83extern int ncl_numasync;
84extern unsigned int ncl_iodmax;
85extern struct nfsstats newnfsstats;
86
87struct task ncl_nfsiodnew_task;
88
89int
90ncl_uninit(struct vfsconf *vfsp)
91{
92 /*
93 * XXX: Unloading of nfscl module is unsupported.
94 */
95#if 0
96 int i;
97
98 /*
99 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
100 * any sleeping nfsiods so they check ncl_iodmax and exit.
101 */
102 mtx_lock(&ncl_iod_mutex);
103 ncl_iodmax = 0;
104 for (i = 0; i < ncl_numasync; i++)
105 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
106 wakeup(&ncl_iodwant[i]);
107 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
108 while (ncl_numasync)
109 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
110 mtx_unlock(&ncl_iod_mutex);
111 ncl_nhuninit();
112 return (0);
113#else
114 return (EOPNOTSUPP);
115#endif
116}
117
118void
119ncl_dircookie_lock(struct nfsnode *np)
120{
121 mtx_lock(&np->n_mtx);
122 while (np->n_flag & NDIRCOOKIELK)
123 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
124 np->n_flag |= NDIRCOOKIELK;
125 mtx_unlock(&np->n_mtx);
126}
127
128void
129ncl_dircookie_unlock(struct nfsnode *np)
130{
131 mtx_lock(&np->n_mtx);
132 np->n_flag &= ~NDIRCOOKIELK;
133 wakeup(&np->n_flag);
134 mtx_unlock(&np->n_mtx);
135}
136
137int
138ncl_upgrade_vnlock(struct vnode *vp)
139{
140 int old_lock;
141
142 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
143 old_lock = VOP_ISLOCKED(vp);
144 if (old_lock != LK_EXCLUSIVE) {
145 KASSERT(old_lock == LK_SHARED,
146 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
147 /* Upgrade to exclusive lock, this might block */
148 vn_lock(vp, LK_UPGRADE | LK_RETRY);
149 }
150 return (old_lock);
151}
152
153void
154ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
155{
156 if (old_lock != LK_EXCLUSIVE) {
157 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
158 /* Downgrade from exclusive lock. */
159 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
160 }
161}
162
163void
164ncl_printf(const char *fmt, ...)
165{
166 va_list ap;
167
168 mtx_lock(&Giant);
169 va_start(ap, fmt);
170 vprintf(fmt, ap);
171 va_end(ap);
172 mtx_unlock(&Giant);
173}
174
175#ifdef NFS_ACDEBUG
176#include <sys/sysctl.h>
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177SYSCTL_DECL(_vfs_newnfs);
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| 177SYSCTL_DECL(_vfs_nfs); |
178static int nfs_acdebug;
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179SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
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| 179SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); |
180#endif
181
182/*
183 * Check the time stamp
184 * If the cache is valid, copy contents to *vap and return 0
185 * otherwise return an error
186 */
187int
188ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
189{
190 struct nfsnode *np;
191 struct vattr *vap;
192 struct nfsmount *nmp;
193 int timeo, mustflush;
194
195 np = VTONFS(vp);
196 vap = &np->n_vattr.na_vattr;
197 nmp = VFSTONFS(vp->v_mount);
198 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */
199#ifdef NFS_ACDEBUG
200 mtx_lock(&Giant); /* ncl_printf() */
201#endif
202 mtx_lock(&np->n_mtx);
203 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
204 timeo = (time_second - np->n_mtime.tv_sec) / 10;
205
206#ifdef NFS_ACDEBUG
207 if (nfs_acdebug>1)
208 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
209#endif
210
211 if (vap->va_type == VDIR) {
212 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
213 timeo = nmp->nm_acdirmin;
214 else if (timeo > nmp->nm_acdirmax)
215 timeo = nmp->nm_acdirmax;
216 } else {
217 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
218 timeo = nmp->nm_acregmin;
219 else if (timeo > nmp->nm_acregmax)
220 timeo = nmp->nm_acregmax;
221 }
222
223#ifdef NFS_ACDEBUG
224 if (nfs_acdebug > 2)
225 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
226 nmp->nm_acregmin, nmp->nm_acregmax,
227 nmp->nm_acdirmin, nmp->nm_acdirmax);
228
229 if (nfs_acdebug)
230 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
231 (time_second - np->n_attrstamp), timeo);
232#endif
233
234 if ((time_second - np->n_attrstamp) >= timeo &&
235 (mustflush != 0 || np->n_attrstamp == 0)) {
236 newnfsstats.attrcache_misses++;
237 mtx_unlock(&np->n_mtx);
238#ifdef NFS_ACDEBUG
239 mtx_unlock(&Giant); /* ncl_printf() */
240#endif
241 return( ENOENT);
242 }
243 newnfsstats.attrcache_hits++;
244 if (vap->va_size != np->n_size) {
245 if (vap->va_type == VREG) {
246 if (np->n_flag & NMODIFIED) {
247 if (vap->va_size < np->n_size)
248 vap->va_size = np->n_size;
249 else
250 np->n_size = vap->va_size;
251 } else {
252 np->n_size = vap->va_size;
253 }
254 vnode_pager_setsize(vp, np->n_size);
255 } else {
256 np->n_size = vap->va_size;
257 }
258 }
259 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
260 if (np->n_flag & NCHG) {
261 if (np->n_flag & NACC)
262 vaper->va_atime = np->n_atim;
263 if (np->n_flag & NUPD)
264 vaper->va_mtime = np->n_mtim;
265 }
266 mtx_unlock(&np->n_mtx);
267#ifdef NFS_ACDEBUG
268 mtx_unlock(&Giant); /* ncl_printf() */
269#endif
270 return (0);
271}
272
273static nfsuint64 nfs_nullcookie = { { 0, 0 } };
274/*
275 * This function finds the directory cookie that corresponds to the
276 * logical byte offset given.
277 */
278nfsuint64 *
279ncl_getcookie(struct nfsnode *np, off_t off, int add)
280{
281 struct nfsdmap *dp, *dp2;
282 int pos;
283 nfsuint64 *retval = NULL;
284
285 pos = (uoff_t)off / NFS_DIRBLKSIZ;
286 if (pos == 0 || off < 0) {
287 KASSERT(!add, ("nfs getcookie add at <= 0"));
288 return (&nfs_nullcookie);
289 }
290 pos--;
291 dp = LIST_FIRST(&np->n_cookies);
292 if (!dp) {
293 if (add) {
294 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
295 M_NFSDIROFF, M_WAITOK);
296 dp->ndm_eocookie = 0;
297 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
298 } else
299 goto out;
300 }
301 while (pos >= NFSNUMCOOKIES) {
302 pos -= NFSNUMCOOKIES;
303 if (LIST_NEXT(dp, ndm_list)) {
304 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
305 pos >= dp->ndm_eocookie)
306 goto out;
307 dp = LIST_NEXT(dp, ndm_list);
308 } else if (add) {
309 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
310 M_NFSDIROFF, M_WAITOK);
311 dp2->ndm_eocookie = 0;
312 LIST_INSERT_AFTER(dp, dp2, ndm_list);
313 dp = dp2;
314 } else
315 goto out;
316 }
317 if (pos >= dp->ndm_eocookie) {
318 if (add)
319 dp->ndm_eocookie = pos + 1;
320 else
321 goto out;
322 }
323 retval = &dp->ndm_cookies[pos];
324out:
325 return (retval);
326}
327
328/*
329 * Invalidate cached directory information, except for the actual directory
330 * blocks (which are invalidated separately).
331 * Done mainly to avoid the use of stale offset cookies.
332 */
333void
334ncl_invaldir(struct vnode *vp)
335{
336 struct nfsnode *np = VTONFS(vp);
337
338 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
339 ncl_dircookie_lock(np);
340 np->n_direofoffset = 0;
341 np->n_cookieverf.nfsuquad[0] = 0;
342 np->n_cookieverf.nfsuquad[1] = 0;
343 if (LIST_FIRST(&np->n_cookies))
344 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
345 ncl_dircookie_unlock(np);
346}
347
348/*
349 * The write verifier has changed (probably due to a server reboot), so all
350 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
351 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
352 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
353 * mount point.
354 *
355 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
356 * writes are not clusterable.
357 */
358void
359ncl_clearcommit(struct mount *mp)
360{
361 struct vnode *vp, *nvp;
362 struct buf *bp, *nbp;
363 struct bufobj *bo;
364
365 MNT_ILOCK(mp);
366 MNT_VNODE_FOREACH(vp, mp, nvp) {
367 bo = &vp->v_bufobj;
368 VI_LOCK(vp);
369 if (vp->v_iflag & VI_DOOMED) {
370 VI_UNLOCK(vp);
371 continue;
372 }
373 vholdl(vp);
374 VI_UNLOCK(vp);
375 MNT_IUNLOCK(mp);
376 BO_LOCK(bo);
377 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
378 if (!BUF_ISLOCKED(bp) &&
379 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
380 == (B_DELWRI | B_NEEDCOMMIT))
381 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
382 }
383 BO_UNLOCK(bo);
384 vdrop(vp);
385 MNT_ILOCK(mp);
386 }
387 MNT_IUNLOCK(mp);
388}
389
390/*
391 * Called once to initialize data structures...
392 */
393int
394ncl_init(struct vfsconf *vfsp)
395{
396 int i;
397
398 /* Ensure async daemons disabled */
399 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
400 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
401 ncl_iodmount[i] = NULL;
402 }
403 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
404 ncl_nhinit(); /* Init the nfsnode table */
405
406 return (0);
407}
408
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