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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95
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37 * $FreeBSD: head/sys/nfsclient/nfs_node.c 83366 2001-09-12 08:38:13Z julian $
|
37 */
38
|
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/nfsclient/nfs_node.c 83651 2001-09-18 23:32:09Z peter $"); |
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/fnv_hash.h>
45#include <sys/lock.h>
46#include <sys/malloc.h>
47#include <sys/mount.h>
48#include <sys/namei.h>
49#include <sys/proc.h>
50#include <sys/socket.h>
51#include <sys/sysctl.h>
52#include <sys/vnode.h>
53
54#include <vm/vm_zone.h>
55
56#include <nfs/rpcv2.h>
57#include <nfs/nfsproto.h>
|
57#include
58#include
59#include
|
58#include <nfsclient/nfs.h>
59#include <nfsclient/nfsnode.h>
60#include <nfsclient/nfsmount.h> |
61
62static vm_zone_t nfsnode_zone;
63static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
64static u_long nfsnodehash;
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| 65static int nfs_node_hash_lock; |
66
67#define TRUE 1
68#define FALSE 0
69
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70SYSCTL_DECL(_debug_hashstat);
71 |
72/*
73 * Grab an atomic snapshot of the nfsnode hash chain lengths
74 */
|
71SYSCTL_DECL(_debug_hashstat);
|
75static int
76sysctl_debug_hashstat_rawnfsnode(SYSCTL_HANDLER_ARGS)
77{
78 int error;
79 struct nfsnodehashhead *nnpp;
80 struct nfsnode *nnp;
81 int n_nfsnode;
82 int count;
83
84 n_nfsnode = nfsnodehash + 1; /* nfsnodehash = max index, not count */
85 if (!req->oldptr)
86 return SYSCTL_OUT(req, 0, n_nfsnode * sizeof(int));
87
88 /* Scan hash tables for applicable entries */
89 for (nnpp = nfsnodehashtbl; n_nfsnode > 0; n_nfsnode--, nnpp++) {
90 count = 0;
91 LIST_FOREACH(nnp, nnpp, n_hash) {
92 count++;
93 }
94 error = SYSCTL_OUT(req, (caddr_t)&count, sizeof(count));
95 if (error)
96 return (error);
97 }
98 return (0);
99}
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97SYSCTL_PROC(_debug_hashstat, OID_AUTO, rawnfsnode, CTLTYPE_INT|CTLFLAG_RD,
98 0, 0, sysctl_debug_hashstat_rawnfsnode, "S,int", "nfsnode chain lengths");
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100SYSCTL_PROC(_debug_hashstat, OID_AUTO, rawnfsnode, CTLTYPE_INT|CTLFLAG_RD, 0, 0,
101 sysctl_debug_hashstat_rawnfsnode, "S,int", "nfsnode chain lengths"); |
102
103static int
104sysctl_debug_hashstat_nfsnode(SYSCTL_HANDLER_ARGS)
105{
106 int error;
107 struct nfsnodehashhead *nnpp;
108 struct nfsnode *nnp;
109 int n_nfsnode;
110 int count, maxlength, used, pct;
111
112 if (!req->oldptr)
113 return SYSCTL_OUT(req, 0, 4 * sizeof(int));
114
115 n_nfsnode = nfsnodehash + 1; /* nfsnodehash = max index, not count */
116 used = 0;
117 maxlength = 0;
118
119 /* Scan hash tables for applicable entries */
120 for (nnpp = nfsnodehashtbl; n_nfsnode > 0; n_nfsnode--, nnpp++) {
121 count = 0;
122 LIST_FOREACH(nnp, nnpp, n_hash) {
123 count++;
124 }
125 if (count)
126 used++;
127 if (maxlength < count)
128 maxlength = count;
129 }
130 n_nfsnode = nfsnodehash + 1;
131 pct = (used * 100 * 100) / n_nfsnode;
132 error = SYSCTL_OUT(req, (caddr_t)&n_nfsnode, sizeof(n_nfsnode));
133 if (error)
134 return (error);
135 error = SYSCTL_OUT(req, (caddr_t)&used, sizeof(used));
136 if (error)
137 return (error);
138 error = SYSCTL_OUT(req, (caddr_t)&maxlength, sizeof(maxlength));
139 if (error)
140 return (error);
141 error = SYSCTL_OUT(req, (caddr_t)&pct, sizeof(pct));
142 if (error)
143 return (error);
144 return (0);
145}
146SYSCTL_PROC(_debug_hashstat, OID_AUTO, nfsnode, CTLTYPE_INT|CTLFLAG_RD,
147 0, 0, sysctl_debug_hashstat_nfsnode, "I", "nfsnode chain lengths");
148
149/*
150 * Initialize hash links for nfsnodes
151 * and build nfsnode free list.
152 */
153void
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151nfs_nhinit()
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| 154nfs_nhinit(void) |
155{
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| 156 |
157 nfsnode_zone = zinit("NFSNODE", sizeof(struct nfsnode), 0, 0, 1);
158 nfsnodehashtbl = hashinit(desiredvnodes, M_NFSHASH, &nfsnodehash);
159}
160
161/*
162 * Look up a vnode/nfsnode by file handle.
163 * Callers must check for mount points!!
164 * In all cases, a pointer to a
165 * nfsnode structure is returned.
166 */
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163static int nfs_node_hash_lock;
164
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167int
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166nfs_nget(mntp, fhp, fhsize, npp)
167 struct mount *mntp;
168 register nfsfh_t *fhp;
169 int fhsize;
170 struct nfsnode **npp;
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| 168nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp) |
169{
170 struct thread *td = curthread; /* XXX */
171 struct nfsnode *np, *np2;
172 struct nfsnodehashhead *nhpp;
|
175 register struct vnode *vp;
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| 173 struct vnode *vp; |
174 struct vnode *nvp;
175 int error;
176 int rsflags;
177 struct nfsmount *nmp;
178
179 /*
180 * Calculate nfs mount point and figure out whether the rslock should
181 * be interruptable or not.
182 */
183 nmp = VFSTONFS(mntp);
184 if (nmp->nm_flag & NFSMNT_INT)
185 rsflags = PCATCH;
186 else
187 rsflags = 0;
188
189retry:
190 nhpp = NFSNOHASH(fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT));
191loop:
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194 for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
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| 192 LIST_FOREACH(np, nhpp, n_hash) { |
193 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
194 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
195 continue;
196 vp = NFSTOV(np);
197 if (vget(vp, LK_EXCLUSIVE, td))
198 goto loop;
199 *npp = np;
200 return(0);
201 }
202 /*
203 * Obtain a lock to prevent a race condition if the getnewvnode()
204 * or MALLOC() below happens to block.
205 */
206 if (nfs_node_hash_lock) {
207 while (nfs_node_hash_lock) {
208 nfs_node_hash_lock = -1;
209 tsleep(&nfs_node_hash_lock, PVM, "nfsngt", 0);
210 }
211 goto loop;
212 }
213 nfs_node_hash_lock = 1;
214
215 /*
216 * Allocate before getnewvnode since doing so afterward
217 * might cause a bogus v_data pointer to get dereferenced
218 * elsewhere if zalloc should block.
219 */
220 np = zalloc(nfsnode_zone);
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223
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| 221 |
222 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
223 if (error) {
224 if (nfs_node_hash_lock < 0)
225 wakeup(&nfs_node_hash_lock);
226 nfs_node_hash_lock = 0;
227 *npp = 0;
228 zfree(nfsnode_zone, np);
229 return (error);
230 }
231 vp = nvp;
232 bzero((caddr_t)np, sizeof *np);
233 vp->v_data = np;
234 np->n_vnode = vp;
235 /*
236 * Insert the nfsnode in the hash queue for its new file handle
237 */
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240 for (np2 = nhpp->lh_first; np2 != 0; np2 = np2->n_hash.le_next) {
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| 238 LIST_FOREACH(np2, nhpp, n_hash) { |
239 if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
240 bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize))
241 continue;
242 vrele(vp);
243 if (nfs_node_hash_lock < 0)
244 wakeup(&nfs_node_hash_lock);
245 nfs_node_hash_lock = 0;
246 zfree(nfsnode_zone, np);
247 goto retry;
248 }
249 LIST_INSERT_HEAD(nhpp, np, n_hash);
250 if (fhsize > NFS_SMALLFH) {
251 MALLOC(np->n_fhp, nfsfh_t *, fhsize, M_NFSBIGFH, M_WAITOK);
252 } else
253 np->n_fhp = &np->n_fh;
254 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
255 np->n_fhsize = fhsize;
256 lockinit(&np->n_rslock, PVFS | rsflags, "nfrslk", 0, LK_NOPAUSE);
257 lockinit(&vp->v_lock, PVFS, "nfsnlk", 0, LK_NOPAUSE);
258 *npp = np;
259
260 if (nfs_node_hash_lock < 0)
261 wakeup(&nfs_node_hash_lock);
262 nfs_node_hash_lock = 0;
263
264 /*
265 * Lock the new nfsnode.
266 */
267 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
268
269 return (0);
270}
271
272int
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275nfs_inactive(ap)
276 struct vop_inactive_args /* {
277 struct vnode *a_vp;
278 struct thread *a_td;
279 } */ *ap;
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| 273nfs_inactive(struct vop_inactive_args *ap) |
274{
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281 register struct nfsnode *np;
282 register struct sillyrename *sp;
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275 struct nfsnode *np;
276 struct sillyrename *sp; |
277 struct thread *td = curthread; /* XXX */
278
279 np = VTONFS(ap->a_vp);
280 if (prtactive && ap->a_vp->v_usecount != 0)
281 vprint("nfs_inactive: pushing active", ap->a_vp);
282 if (ap->a_vp->v_type != VDIR) {
283 sp = np->n_sillyrename;
284 np->n_sillyrename = (struct sillyrename *)0;
285 } else
286 sp = (struct sillyrename *)0;
287 if (sp) {
288 /*
289 * We need a reference to keep the vnode from being
290 * recycled by getnewvnode while we do the I/O
291 * associated with discarding the buffers unless we
292 * are being forcibly unmounted in which case we already
293 * have our own reference.
294 */
295 if (ap->a_vp->v_usecount > 0)
296 (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, td, 1);
297 else if (vget(ap->a_vp, 0, td))
298 panic("nfs_inactive: lost vnode");
299 else {
300 (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, td, 1);
301 vrele(ap->a_vp);
302 }
303 /*
304 * Remove the silly file that was rename'd earlier
305 */
306 nfs_removeit(sp);
307 crfree(sp->s_cred);
308 vrele(sp->s_dvp);
309 FREE((caddr_t)sp, M_NFSREQ);
310 }
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317 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
318 NQNFSNONCACHE | NQNFSWRITE);
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| 311 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT); |
312 VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
313 return (0);
314}
315
316/*
317 * Reclaim an nfsnode so that it can be used for other purposes.
318 */
319int
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327nfs_reclaim(ap)
328 struct vop_reclaim_args /* {
329 struct vnode *a_vp;
330 } */ *ap;
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| 320nfs_reclaim(struct vop_reclaim_args *ap) |
321{
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332 register struct vnode *vp = ap->a_vp;
333 register struct nfsnode *np = VTONFS(vp);
334 register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
335 register struct nfsdmap *dp, *dp2;
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322 struct vnode *vp = ap->a_vp;
323 struct nfsnode *np = VTONFS(vp);
324 struct nfsdmap *dp, *dp2; |
325
326 if (prtactive && vp->v_usecount != 0)
327 vprint("nfs_reclaim: pushing active", vp);
328
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340 if (np->n_hash.le_prev != NULL)
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| 329 if (np->n_hash.le_prev != NULL) /* XXX beware */ |
330 LIST_REMOVE(np, n_hash);
331
332 /*
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344 * For nqnfs, take it off the timer queue as required.
345 */
346 if ((nmp->nm_flag & NFSMNT_NQNFS) && TAILQ_NEXT(np, n_timer) != 0) {
347 TAILQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
348 }
349
350 /*
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333 * Free up any directory cookie structures and
334 * large file handle structures that might be associated with
335 * this nfs node.
336 */
337 if (vp->v_type == VDIR) {
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356 dp = np->n_cookies.lh_first;
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| 338 dp = LIST_FIRST(&np->n_cookies); |
339 while (dp) {
340 dp2 = dp;
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359 dp = dp->ndm_list.le_next;
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| 341 dp = LIST_NEXT(dp, ndm_list); |
342 FREE((caddr_t)dp2, M_NFSDIROFF);
343 }
344 }
345 if (np->n_fhsize > NFS_SMALLFH) {
346 FREE((caddr_t)np->n_fhp, M_NFSBIGFH);
347 }
348
349 lockdestroy(&np->n_rslock);
350
351 cache_purge(vp);
352 zfree(nfsnode_zone, vp->v_data);
353 vp->v_data = (void *)0;
354 return (0);
355}
356
357#if 0
358/*
359 * Lock an nfsnode
360 */
361int
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380nfs_lock(ap)
381 struct vop_lock_args /* {
382 struct vnode *a_vp;
383 } */ *ap;
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| 362nfs_lock(struct vop_lock_args *ap) |
363{
|
385 register struct vnode *vp = ap->a_vp;
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| 364 struct vnode *vp = ap->a_vp; |
365
366 /*
367 * Ugh, another place where interruptible mounts will get hung.
368 * If you make this sleep interruptible, then you have to fix all
369 * the VOP_LOCK() calls to expect interruptibility.
370 */
371 while (vp->v_flag & VXLOCK) {
372 vp->v_flag |= VXWANT;
373 (void) tsleep((caddr_t)vp, PINOD, "nfslck", 0);
374 }
375 if (vp->v_tag == VT_NON)
376 return (ENOENT);
377
378#if 0
379 /*
380 * Only lock regular files. If a server crashed while we were
381 * holding a directory lock, we could easily end up sleeping
382 * until the server rebooted while holding a lock on the root.
383 * Locks are only needed for protecting critical sections in
384 * VMIO at the moment.
385 * New vnodes will have type VNON but they should be locked
386 * since they may become VREG. This is checked in loadattrcache
387 * and unwanted locks are released there.
388 */
389 if (vp->v_type == VREG || vp->v_type == VNON) {
390 while (np->n_flag & NLOCKED) {
391 np->n_flag |= NWANTED;
392 (void) tsleep((caddr_t) np, PINOD, "nfslck2", 0);
393 /*
394 * If the vnode has transmuted into a VDIR while we
395 * were asleep, then skip the lock.
396 */
397 if (vp->v_type != VREG && vp->v_type != VNON)
398 return (0);
399 }
400 np->n_flag |= NLOCKED;
401 }
402#endif
403
404 return (0);
405}
406
407/*
408 * Unlock an nfsnode
409 */
410int
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432nfs_unlock(ap)
433 struct vop_unlock_args /* {
434 struct vnode *a_vp;
435 } */ *ap;
|
| 411nfs_unlock(struct vop_unlock_args *ap) |
412{
413#if 0
414 struct vnode* vp = ap->a_vp;
415 struct nfsnode* np = VTONFS(vp);
416
417 if (vp->v_type == VREG || vp->v_type == VNON) {
418 if (!(np->n_flag & NLOCKED))
419 panic("nfs_unlock: nfsnode not locked");
420 np->n_flag &= ~NLOCKED;
421 if (np->n_flag & NWANTED) {
422 np->n_flag &= ~NWANTED;
423 wakeup((caddr_t) np);
424 }
425 }
426#endif
427
428 return (0);
429}
430
431/*
432 * Check for a locked nfsnode
433 */
434int
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459nfs_islocked(ap)
460 struct vop_islocked_args /* {
461 struct vnode *a_vp;
462 struct thread *a_td;
463 } */ *ap;
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| 435nfs_islocked(struct vop_islocked_args *ap) |
436{
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| 437 |
438 return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
439}
440#endif
441
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