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nfs_node.c (83366) nfs_node.c (83651)
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

--- 20 unchanged lines hidden (view full) ---

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
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

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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
37 * $FreeBSD: head/sys/nfsclient/nfs_node.c 83366 2001-09-12 08:38:13Z julian $
38 */
39
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/nfsclient/nfs_node.c 83651 2001-09-18 23:32:09Z peter $");
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/fnv_hash.h>
44#include <sys/lock.h>
45#include <sys/malloc.h>
46#include <sys/mount.h>
47#include <sys/namei.h>
48#include <sys/proc.h>
49#include <sys/socket.h>
50#include <sys/sysctl.h>
51#include <sys/vnode.h>
52
53#include <vm/vm_zone.h>
54
55#include <nfs/rpcv2.h>
56#include <nfs/nfsproto.h>
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>
60
61static vm_zone_t nfsnode_zone;
62static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
63static u_long nfsnodehash;
61
62static vm_zone_t nfsnode_zone;
63static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
64static u_long nfsnodehash;
65static int nfs_node_hash_lock;
64
65#define TRUE 1
66#define FALSE 0
67
66
67#define TRUE 1
68#define FALSE 0
69
70SYSCTL_DECL(_debug_hashstat);
71
68/*
69 * Grab an atomic snapshot of the nfsnode hash chain lengths
70 */
72/*
73 * Grab an atomic snapshot of the nfsnode hash chain lengths
74 */
71SYSCTL_DECL(_debug_hashstat);
72static int
73sysctl_debug_hashstat_rawnfsnode(SYSCTL_HANDLER_ARGS)
74{
75 int error;
76 struct nfsnodehashhead *nnpp;
77 struct nfsnode *nnp;
78 int n_nfsnode;
79 int count;

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89 count++;
90 }
91 error = SYSCTL_OUT(req, (caddr_t)&count, sizeof(count));
92 if (error)
93 return (error);
94 }
95 return (0);
96}
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;

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92 count++;
93 }
94 error = SYSCTL_OUT(req, (caddr_t)&count, sizeof(count));
95 if (error)
96 return (error);
97 }
98 return (0);
99}
97SYSCTL_PROC(_debug_hashstat, OID_AUTO, rawnfsnode, CTLTYPE_INT|CTLFLAG_RD,
98 0, 0, sysctl_debug_hashstat_rawnfsnode, "S,int", "nfsnode chain lengths");
100SYSCTL_PROC(_debug_hashstat, OID_AUTO, rawnfsnode, CTLTYPE_INT|CTLFLAG_RD, 0, 0,
101 sysctl_debug_hashstat_rawnfsnode, "S,int", "nfsnode chain lengths");
99
100static int
101sysctl_debug_hashstat_nfsnode(SYSCTL_HANDLER_ARGS)
102{
103 int error;
104 struct nfsnodehashhead *nnpp;
105 struct nfsnode *nnp;
106 int n_nfsnode;

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143SYSCTL_PROC(_debug_hashstat, OID_AUTO, nfsnode, CTLTYPE_INT|CTLFLAG_RD,
144 0, 0, sysctl_debug_hashstat_nfsnode, "I", "nfsnode chain lengths");
145
146/*
147 * Initialize hash links for nfsnodes
148 * and build nfsnode free list.
149 */
150void
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;

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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
151nfs_nhinit()
154nfs_nhinit(void)
152{
155{
156
153 nfsnode_zone = zinit("NFSNODE", sizeof(struct nfsnode), 0, 0, 1);
154 nfsnodehashtbl = hashinit(desiredvnodes, M_NFSHASH, &nfsnodehash);
155}
156
157/*
158 * Look up a vnode/nfsnode by file handle.
159 * Callers must check for mount points!!
160 * In all cases, a pointer to a
161 * nfsnode structure is returned.
162 */
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 */
163static int nfs_node_hash_lock;
164
165int
167int
166nfs_nget(mntp, fhp, fhsize, npp)
167 struct mount *mntp;
168 register nfsfh_t *fhp;
169 int fhsize;
170 struct nfsnode **npp;
168nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp)
171{
172 struct thread *td = curthread; /* XXX */
173 struct nfsnode *np, *np2;
174 struct nfsnodehashhead *nhpp;
169{
170 struct thread *td = curthread; /* XXX */
171 struct nfsnode *np, *np2;
172 struct nfsnodehashhead *nhpp;
175 register struct vnode *vp;
173 struct vnode *vp;
176 struct vnode *nvp;
177 int error;
178 int rsflags;
179 struct nfsmount *nmp;
180
181 /*
182 * Calculate nfs mount point and figure out whether the rslock should
183 * be interruptable or not.
184 */
185 nmp = VFSTONFS(mntp);
186 if (nmp->nm_flag & NFSMNT_INT)
187 rsflags = PCATCH;
188 else
189 rsflags = 0;
190
191retry:
192 nhpp = NFSNOHASH(fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT));
193loop:
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:
194 for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
192 LIST_FOREACH(np, nhpp, n_hash) {
195 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
196 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
197 continue;
198 vp = NFSTOV(np);
199 if (vget(vp, LK_EXCLUSIVE, td))
200 goto loop;
201 *npp = np;
202 return(0);

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215 nfs_node_hash_lock = 1;
216
217 /*
218 * Allocate before getnewvnode since doing so afterward
219 * might cause a bogus v_data pointer to get dereferenced
220 * elsewhere if zalloc should block.
221 */
222 np = zalloc(nfsnode_zone);
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);

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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);
223
221
224 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
225 if (error) {
226 if (nfs_node_hash_lock < 0)
227 wakeup(&nfs_node_hash_lock);
228 nfs_node_hash_lock = 0;
229 *npp = 0;
230 zfree(nfsnode_zone, np);
231 return (error);
232 }
233 vp = nvp;
234 bzero((caddr_t)np, sizeof *np);
235 vp->v_data = np;
236 np->n_vnode = vp;
237 /*
238 * Insert the nfsnode in the hash queue for its new file handle
239 */
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 */
240 for (np2 = nhpp->lh_first; np2 != 0; np2 = np2->n_hash.le_next) {
238 LIST_FOREACH(np2, nhpp, n_hash) {
241 if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
242 bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize))
243 continue;
244 vrele(vp);
245 if (nfs_node_hash_lock < 0)
246 wakeup(&nfs_node_hash_lock);
247 nfs_node_hash_lock = 0;
248 zfree(nfsnode_zone, np);

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267 * Lock the new nfsnode.
268 */
269 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
270
271 return (0);
272}
273
274int
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);

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265 * Lock the new nfsnode.
266 */
267 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
268
269 return (0);
270}
271
272int
275nfs_inactive(ap)
276 struct vop_inactive_args /* {
277 struct vnode *a_vp;
278 struct thread *a_td;
279 } */ *ap;
273nfs_inactive(struct vop_inactive_args *ap)
280{
274{
281 register struct nfsnode *np;
282 register struct sillyrename *sp;
275 struct nfsnode *np;
276 struct sillyrename *sp;
283 struct thread *td = curthread; /* XXX */
284
285 np = VTONFS(ap->a_vp);
286 if (prtactive && ap->a_vp->v_usecount != 0)
287 vprint("nfs_inactive: pushing active", ap->a_vp);
288 if (ap->a_vp->v_type != VDIR) {
289 sp = np->n_sillyrename;
290 np->n_sillyrename = (struct sillyrename *)0;

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309 /*
310 * Remove the silly file that was rename'd earlier
311 */
312 nfs_removeit(sp);
313 crfree(sp->s_cred);
314 vrele(sp->s_dvp);
315 FREE((caddr_t)sp, M_NFSREQ);
316 }
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;

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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 }
317 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
318 NQNFSNONCACHE | NQNFSWRITE);
311 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT);
319 VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
320 return (0);
321}
322
323/*
324 * Reclaim an nfsnode so that it can be used for other purposes.
325 */
326int
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
327nfs_reclaim(ap)
328 struct vop_reclaim_args /* {
329 struct vnode *a_vp;
330 } */ *ap;
320nfs_reclaim(struct vop_reclaim_args *ap)
331{
321{
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;
322 struct vnode *vp = ap->a_vp;
323 struct nfsnode *np = VTONFS(vp);
324 struct nfsdmap *dp, *dp2;
336
337 if (prtactive && vp->v_usecount != 0)
338 vprint("nfs_reclaim: pushing active", vp);
339
325
326 if (prtactive && vp->v_usecount != 0)
327 vprint("nfs_reclaim: pushing active", vp);
328
340 if (np->n_hash.le_prev != NULL)
329 if (np->n_hash.le_prev != NULL) /* XXX beware */
341 LIST_REMOVE(np, n_hash);
342
343 /*
330 LIST_REMOVE(np, n_hash);
331
332 /*
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 /*
351 * Free up any directory cookie structures and
352 * large file handle structures that might be associated with
353 * this nfs node.
354 */
355 if (vp->v_type == VDIR) {
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) {
356 dp = np->n_cookies.lh_first;
338 dp = LIST_FIRST(&np->n_cookies);
357 while (dp) {
358 dp2 = dp;
339 while (dp) {
340 dp2 = dp;
359 dp = dp->ndm_list.le_next;
341 dp = LIST_NEXT(dp, ndm_list);
360 FREE((caddr_t)dp2, M_NFSDIROFF);
361 }
362 }
363 if (np->n_fhsize > NFS_SMALLFH) {
364 FREE((caddr_t)np->n_fhp, M_NFSBIGFH);
365 }
366
367 lockdestroy(&np->n_rslock);

--- 4 unchanged lines hidden (view full) ---

372 return (0);
373}
374
375#if 0
376/*
377 * Lock an nfsnode
378 */
379int
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);

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354 return (0);
355}
356
357#if 0
358/*
359 * Lock an nfsnode
360 */
361int
380nfs_lock(ap)
381 struct vop_lock_args /* {
382 struct vnode *a_vp;
383 } */ *ap;
362nfs_lock(struct vop_lock_args *ap)
384{
363{
385 register struct vnode *vp = ap->a_vp;
364 struct vnode *vp = ap->a_vp;
386
387 /*
388 * Ugh, another place where interruptible mounts will get hung.
389 * If you make this sleep interruptible, then you have to fix all
390 * the VOP_LOCK() calls to expect interruptibility.
391 */
392 while (vp->v_flag & VXLOCK) {
393 vp->v_flag |= VXWANT;

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424
425 return (0);
426}
427
428/*
429 * Unlock an nfsnode
430 */
431int
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;

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403
404 return (0);
405}
406
407/*
408 * Unlock an nfsnode
409 */
410int
432nfs_unlock(ap)
433 struct vop_unlock_args /* {
434 struct vnode *a_vp;
435 } */ *ap;
411nfs_unlock(struct vop_unlock_args *ap)
436{
437#if 0
438 struct vnode* vp = ap->a_vp;
439 struct nfsnode* np = VTONFS(vp);
440
441 if (vp->v_type == VREG || vp->v_type == VNON) {
442 if (!(np->n_flag & NLOCKED))
443 panic("nfs_unlock: nfsnode not locked");

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451
452 return (0);
453}
454
455/*
456 * Check for a locked nfsnode
457 */
458int
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");

--- 7 unchanged lines hidden (view full) ---

427
428 return (0);
429}
430
431/*
432 * Check for a locked nfsnode
433 */
434int
459nfs_islocked(ap)
460 struct vop_islocked_args /* {
461 struct vnode *a_vp;
462 struct thread *a_td;
463 } */ *ap;
435nfs_islocked(struct vop_islocked_args *ap)
464{
436{
437
465 return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
466}
467#endif
468
438 return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
439}
440#endif
441