[PATCH] nfsd4: reboot recovery fix
[linux-2.6.git] / fs / nfsd / nfs4state.c
1 /*
2 *  linux/fs/nfsd/nfs4state.c
3 *
4 *  Copyright (c) 2001 The Regents of the University of Michigan.
5 *  All rights reserved.
6 *
7 *  Kendrick Smith <kmsmith@umich.edu>
8 *  Andy Adamson <kandros@umich.edu>
9 *
10 *  Redistribution and use in source and binary forms, with or without
11 *  modification, are permitted provided that the following conditions
12 *  are met:
13 *
14 *  1. Redistributions of source code must retain the above copyright
15 *     notice, this list of conditions and the following disclaimer.
16 *  2. Redistributions in binary form must reproduce the above copyright
17 *     notice, this list of conditions and the following disclaimer in the
18 *     documentation and/or other materials provided with the distribution.
19 *  3. Neither the name of the University nor the names of its
20 *     contributors may be used to endorse or promote products derived
21 *     from this software without specific prior written permission.
22 *
23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 */
36
37 #include <linux/param.h>
38 #include <linux/major.h>
39 #include <linux/slab.h>
40
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/cache.h>
44 #include <linux/mount.h>
45 #include <linux/workqueue.h>
46 #include <linux/smp_lock.h>
47 #include <linux/kthread.h>
48 #include <linux/nfs4.h>
49 #include <linux/nfsd/state.h>
50 #include <linux/nfsd/xdr4.h>
51 #include <linux/namei.h>
52
53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
54
55 /* Globals */
56 static time_t lease_time = 90;     /* default lease time */
57 static time_t user_lease_time = 90;
58 static time_t boot_time;
59 static int in_grace = 1;
60 static u32 current_clientid = 1;
61 static u32 current_ownerid = 1;
62 static u32 current_fileid = 1;
63 static u32 current_delegid = 1;
64 static u32 nfs4_init;
65 static stateid_t zerostateid;             /* bits all 0 */
66 static stateid_t onestateid;              /* bits all 1 */
67
68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
70
71 /* forward declarations */
72 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
73 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
74 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
75 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
76 static void nfs4_set_recdir(char *recdir);
77
78 /* Locking:
79  *
80  * client_sema: 
81  *      protects clientid_hashtbl[], clientstr_hashtbl[],
82  *      unconfstr_hashtbl[], uncofid_hashtbl[].
83  */
84 static DECLARE_MUTEX(client_sema);
85
86 static kmem_cache_t *stateowner_slab = NULL;
87 static kmem_cache_t *file_slab = NULL;
88 static kmem_cache_t *stateid_slab = NULL;
89 static kmem_cache_t *deleg_slab = NULL;
90
91 void
92 nfs4_lock_state(void)
93 {
94         down(&client_sema);
95 }
96
97 void
98 nfs4_unlock_state(void)
99 {
100         up(&client_sema);
101 }
102
103 static inline u32
104 opaque_hashval(const void *ptr, int nbytes)
105 {
106         unsigned char *cptr = (unsigned char *) ptr;
107
108         u32 x = 0;
109         while (nbytes--) {
110                 x *= 37;
111                 x += *cptr++;
112         }
113         return x;
114 }
115
116 /* forward declarations */
117 static void release_stateowner(struct nfs4_stateowner *sop);
118 static void release_stateid(struct nfs4_stateid *stp, int flags);
119
120 /*
121  * Delegation state
122  */
123
124 /* recall_lock protects the del_recall_lru */
125 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
126 static struct list_head del_recall_lru;
127
128 static void
129 free_nfs4_file(struct kref *kref)
130 {
131         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
132         list_del(&fp->fi_hash);
133         iput(fp->fi_inode);
134         kmem_cache_free(file_slab, fp);
135 }
136
137 static inline void
138 put_nfs4_file(struct nfs4_file *fi)
139 {
140         kref_put(&fi->fi_ref, free_nfs4_file);
141 }
142
143 static inline void
144 get_nfs4_file(struct nfs4_file *fi)
145 {
146         kref_get(&fi->fi_ref);
147 }
148
149 static struct nfs4_delegation *
150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
151 {
152         struct nfs4_delegation *dp;
153         struct nfs4_file *fp = stp->st_file;
154         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
155
156         dprintk("NFSD alloc_init_deleg\n");
157         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
158         if (dp == NULL)
159                 return dp;
160         INIT_LIST_HEAD(&dp->dl_perfile);
161         INIT_LIST_HEAD(&dp->dl_perclnt);
162         INIT_LIST_HEAD(&dp->dl_recall_lru);
163         dp->dl_client = clp;
164         get_nfs4_file(fp);
165         dp->dl_file = fp;
166         dp->dl_flock = NULL;
167         get_file(stp->st_vfs_file);
168         dp->dl_vfs_file = stp->st_vfs_file;
169         dp->dl_type = type;
170         dp->dl_recall.cbr_dp = NULL;
171         dp->dl_recall.cbr_ident = cb->cb_ident;
172         dp->dl_recall.cbr_trunc = 0;
173         dp->dl_stateid.si_boot = boot_time;
174         dp->dl_stateid.si_stateownerid = current_delegid++;
175         dp->dl_stateid.si_fileid = 0;
176         dp->dl_stateid.si_generation = 0;
177         dp->dl_fhlen = current_fh->fh_handle.fh_size;
178         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
179                         current_fh->fh_handle.fh_size);
180         dp->dl_time = 0;
181         atomic_set(&dp->dl_count, 1);
182         list_add(&dp->dl_perfile, &fp->fi_delegations);
183         list_add(&dp->dl_perclnt, &clp->cl_delegations);
184         return dp;
185 }
186
187 void
188 nfs4_put_delegation(struct nfs4_delegation *dp)
189 {
190         if (atomic_dec_and_test(&dp->dl_count)) {
191                 dprintk("NFSD: freeing dp %p\n",dp);
192                 put_nfs4_file(dp->dl_file);
193                 kmem_cache_free(deleg_slab, dp);
194         }
195 }
196
197 /* Remove the associated file_lock first, then remove the delegation.
198  * lease_modify() is called to remove the FS_LEASE file_lock from
199  * the i_flock list, eventually calling nfsd's lock_manager
200  * fl_release_callback.
201  */
202 static void
203 nfs4_close_delegation(struct nfs4_delegation *dp)
204 {
205         struct file *filp = dp->dl_vfs_file;
206
207         dprintk("NFSD: close_delegation dp %p\n",dp);
208         dp->dl_vfs_file = NULL;
209         /* The following nfsd_close may not actually close the file,
210          * but we want to remove the lease in any case. */
211         if (dp->dl_flock)
212                 setlease(filp, F_UNLCK, &dp->dl_flock);
213         nfsd_close(filp);
214 }
215
216 /* Called under the state lock. */
217 static void
218 unhash_delegation(struct nfs4_delegation *dp)
219 {
220         list_del_init(&dp->dl_perfile);
221         list_del_init(&dp->dl_perclnt);
222         spin_lock(&recall_lock);
223         list_del_init(&dp->dl_recall_lru);
224         spin_unlock(&recall_lock);
225         nfs4_close_delegation(dp);
226         nfs4_put_delegation(dp);
227 }
228
229 /* 
230  * SETCLIENTID state 
231  */
232
233 /* Hash tables for nfs4_clientid state */
234 #define CLIENT_HASH_BITS                 4
235 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
236 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
237
238 #define clientid_hashval(id) \
239         ((id) & CLIENT_HASH_MASK)
240 #define clientstr_hashval(name) \
241         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
242 /*
243  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
244  * used in reboot/reset lease grace period processing
245  *
246  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
247  * setclientid_confirmed info. 
248  *
249  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
250  * setclientid info.
251  *
252  * client_lru holds client queue ordered by nfs4_client.cl_time
253  * for lease renewal.
254  *
255  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
256  * for last close replay.
257  */
258 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
259 static int reclaim_str_hashtbl_size = 0;
260 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
261 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
262 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
263 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
264 static struct list_head client_lru;
265 static struct list_head close_lru;
266
267 static inline void
268 renew_client(struct nfs4_client *clp)
269 {
270         /*
271         * Move client to the end to the LRU list.
272         */
273         dprintk("renewing client (clientid %08x/%08x)\n", 
274                         clp->cl_clientid.cl_boot, 
275                         clp->cl_clientid.cl_id);
276         list_move_tail(&clp->cl_lru, &client_lru);
277         clp->cl_time = get_seconds();
278 }
279
280 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
281 static int
282 STALE_CLIENTID(clientid_t *clid)
283 {
284         if (clid->cl_boot == boot_time)
285                 return 0;
286         dprintk("NFSD stale clientid (%08x/%08x)\n", 
287                         clid->cl_boot, clid->cl_id);
288         return 1;
289 }
290
291 /* 
292  * XXX Should we use a slab cache ?
293  * This type of memory management is somewhat inefficient, but we use it
294  * anyway since SETCLIENTID is not a common operation.
295  */
296 static inline struct nfs4_client *
297 alloc_client(struct xdr_netobj name)
298 {
299         struct nfs4_client *clp;
300
301         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
302                 memset(clp, 0, sizeof(*clp));
303                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
304                         memcpy(clp->cl_name.data, name.data, name.len);
305                         clp->cl_name.len = name.len;
306                 }
307                 else {
308                         kfree(clp);
309                         clp = NULL;
310                 }
311         }
312         return clp;
313 }
314
315 static inline void
316 free_client(struct nfs4_client *clp)
317 {
318         if (clp->cl_cred.cr_group_info)
319                 put_group_info(clp->cl_cred.cr_group_info);
320         kfree(clp->cl_name.data);
321         kfree(clp);
322 }
323
324 void
325 put_nfs4_client(struct nfs4_client *clp)
326 {
327         if (atomic_dec_and_test(&clp->cl_count))
328                 free_client(clp);
329 }
330
331 static void
332 expire_client(struct nfs4_client *clp)
333 {
334         struct nfs4_stateowner *sop;
335         struct nfs4_delegation *dp;
336         struct nfs4_callback *cb = &clp->cl_callback;
337         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
338         struct list_head reaplist;
339
340         dprintk("NFSD: expire_client cl_count %d\n",
341                             atomic_read(&clp->cl_count));
342
343         /* shutdown rpc client, ending any outstanding recall rpcs */
344         if (atomic_read(&cb->cb_set) == 1 && clnt) {
345                 rpc_shutdown_client(clnt);
346                 clnt = clp->cl_callback.cb_client = NULL;
347         }
348
349         INIT_LIST_HEAD(&reaplist);
350         spin_lock(&recall_lock);
351         while (!list_empty(&clp->cl_delegations)) {
352                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
353                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
354                                 dp->dl_flock);
355                 list_del_init(&dp->dl_perclnt);
356                 list_move(&dp->dl_recall_lru, &reaplist);
357         }
358         spin_unlock(&recall_lock);
359         while (!list_empty(&reaplist)) {
360                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
361                 list_del_init(&dp->dl_recall_lru);
362                 unhash_delegation(dp);
363         }
364         list_del(&clp->cl_idhash);
365         list_del(&clp->cl_strhash);
366         list_del(&clp->cl_lru);
367         while (!list_empty(&clp->cl_openowners)) {
368                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
369                 release_stateowner(sop);
370         }
371         put_nfs4_client(clp);
372 }
373
374 static struct nfs4_client *
375 create_client(struct xdr_netobj name, char *recdir) {
376         struct nfs4_client *clp;
377
378         if (!(clp = alloc_client(name)))
379                 goto out;
380         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
381         atomic_set(&clp->cl_count, 1);
382         atomic_set(&clp->cl_callback.cb_set, 0);
383         INIT_LIST_HEAD(&clp->cl_idhash);
384         INIT_LIST_HEAD(&clp->cl_strhash);
385         INIT_LIST_HEAD(&clp->cl_openowners);
386         INIT_LIST_HEAD(&clp->cl_delegations);
387         INIT_LIST_HEAD(&clp->cl_lru);
388 out:
389         return clp;
390 }
391
392 static void
393 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
394         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
395 }
396
397 static void
398 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
399         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
400         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
401 }
402
403 static void
404 copy_cred(struct svc_cred *target, struct svc_cred *source) {
405
406         target->cr_uid = source->cr_uid;
407         target->cr_gid = source->cr_gid;
408         target->cr_group_info = source->cr_group_info;
409         get_group_info(target->cr_group_info);
410 }
411
412 static inline int
413 same_name(const char *n1, const char *n2) {
414         return 0 == memcmp(n1, n2, HEXDIR_LEN);
415 }
416
417 static int
418 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
419         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
420 }
421
422 static int
423 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
424         return((cl1->cl_boot == cl2->cl_boot) &&
425                 (cl1->cl_id == cl2->cl_id));
426 }
427
428 /* XXX what about NGROUP */
429 static int
430 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
431         return(cr1->cr_uid == cr2->cr_uid);
432
433 }
434
435 static void
436 gen_clid(struct nfs4_client *clp) {
437         clp->cl_clientid.cl_boot = boot_time;
438         clp->cl_clientid.cl_id = current_clientid++; 
439 }
440
441 static void
442 gen_confirm(struct nfs4_client *clp) {
443         struct timespec         tv;
444         u32 *                   p;
445
446         tv = CURRENT_TIME;
447         p = (u32 *)clp->cl_confirm.data;
448         *p++ = tv.tv_sec;
449         *p++ = tv.tv_nsec;
450 }
451
452 static int
453 check_name(struct xdr_netobj name) {
454
455         if (name.len == 0) 
456                 return 0;
457         if (name.len > NFS4_OPAQUE_LIMIT) {
458                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
459                 return 0;
460         }
461         return 1;
462 }
463
464 static void
465 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
466 {
467         unsigned int idhashval;
468
469         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
470         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
471         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
472         list_add_tail(&clp->cl_lru, &client_lru);
473         clp->cl_time = get_seconds();
474 }
475
476 static void
477 move_to_confirmed(struct nfs4_client *clp)
478 {
479         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
480         unsigned int strhashval;
481
482         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
483         list_del_init(&clp->cl_strhash);
484         list_del_init(&clp->cl_idhash);
485         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
486         strhashval = clientstr_hashval(clp->cl_recdir);
487         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
488         renew_client(clp);
489 }
490
491 static struct nfs4_client *
492 find_confirmed_client(clientid_t *clid)
493 {
494         struct nfs4_client *clp;
495         unsigned int idhashval = clientid_hashval(clid->cl_id);
496
497         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
498                 if (cmp_clid(&clp->cl_clientid, clid))
499                         return clp;
500         }
501         return NULL;
502 }
503
504 static struct nfs4_client *
505 find_unconfirmed_client(clientid_t *clid)
506 {
507         struct nfs4_client *clp;
508         unsigned int idhashval = clientid_hashval(clid->cl_id);
509
510         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
511                 if (cmp_clid(&clp->cl_clientid, clid))
512                         return clp;
513         }
514         return NULL;
515 }
516
517 static struct nfs4_client *
518 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
519 {
520         struct nfs4_client *clp;
521
522         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
523                 if (same_name(clp->cl_recdir, dname))
524                         return clp;
525         }
526         return NULL;
527 }
528
529 static struct nfs4_client *
530 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
531 {
532         struct nfs4_client *clp;
533
534         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
535                 if (same_name(clp->cl_recdir, dname))
536                         return clp;
537         }
538         return NULL;
539 }
540
541 /* a helper function for parse_callback */
542 static int
543 parse_octet(unsigned int *lenp, char **addrp)
544 {
545         unsigned int len = *lenp;
546         char *p = *addrp;
547         int n = -1;
548         char c;
549
550         for (;;) {
551                 if (!len)
552                         break;
553                 len--;
554                 c = *p++;
555                 if (c == '.')
556                         break;
557                 if ((c < '0') || (c > '9')) {
558                         n = -1;
559                         break;
560                 }
561                 if (n < 0)
562                         n = 0;
563                 n = (n * 10) + (c - '0');
564                 if (n > 255) {
565                         n = -1;
566                         break;
567                 }
568         }
569         *lenp = len;
570         *addrp = p;
571         return n;
572 }
573
574 /* parse and set the setclientid ipv4 callback address */
575 static int
576 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
577 {
578         int temp = 0;
579         u32 cbaddr = 0;
580         u16 cbport = 0;
581         u32 addrlen = addr_len;
582         char *addr = addr_val;
583         int i, shift;
584
585         /* ipaddress */
586         shift = 24;
587         for(i = 4; i > 0  ; i--) {
588                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
589                         return 0;
590                 }
591                 cbaddr |= (temp << shift);
592                 if (shift > 0)
593                 shift -= 8;
594         }
595         *cbaddrp = cbaddr;
596
597         /* port */
598         shift = 8;
599         for(i = 2; i > 0  ; i--) {
600                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
601                         return 0;
602                 }
603                 cbport |= (temp << shift);
604                 if (shift > 0)
605                         shift -= 8;
606         }
607         *cbportp = cbport;
608         return 1;
609 }
610
611 static void
612 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
613 {
614         struct nfs4_callback *cb = &clp->cl_callback;
615
616         /* Currently, we only support tcp for the callback channel */
617         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
618                 goto out_err;
619
620         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
621                          &cb->cb_addr, &cb->cb_port)))
622                 goto out_err;
623         cb->cb_prog = se->se_callback_prog;
624         cb->cb_ident = se->se_callback_ident;
625         return;
626 out_err:
627         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
628                 "will not receive delegations\n",
629                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
630
631         return;
632 }
633
634 /*
635  * RFC 3010 has a complex implmentation description of processing a 
636  * SETCLIENTID request consisting of 5 bullets, labeled as 
637  * CASE0 - CASE4 below.
638  *
639  * NOTES:
640  *      callback information will be processed in a future patch
641  *
642  *      an unconfirmed record is added when:
643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644  *      CASE 1: confirmed record found with matching name, principal,
645  *              verifier, and clientid.
646  *      CASE 2: confirmed record found with matching name, principal,
647  *              and there is no unconfirmed record with matching
648  *              name and principal
649  *
650  *      an unconfirmed record is replaced when:
651  *      CASE 3: confirmed record found with matching name, principal,
652  *              and an unconfirmed record is found with matching 
653  *              name, principal, and with clientid and
654  *              confirm that does not match the confirmed record.
655  *      CASE 4: there is no confirmed record with matching name and 
656  *              principal. there is an unconfirmed record with 
657  *              matching name, principal.
658  *
659  *      an unconfirmed record is deleted when:
660  *      CASE 1: an unconfirmed record that matches input name, verifier,
661  *              and confirmed clientid.
662  *      CASE 4: any unconfirmed records with matching name and principal
663  *              that exist after an unconfirmed record has been replaced
664  *              as described above.
665  *
666  */
667 int
668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669 {
670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671         struct xdr_netobj       clname = { 
672                 .len = setclid->se_namelen,
673                 .data = setclid->se_name,
674         };
675         nfs4_verifier           clverifier = setclid->se_verf;
676         unsigned int            strhashval;
677         struct nfs4_client      *conf, *unconf, *new;
678         int                     status;
679         char                    dname[HEXDIR_LEN];
680         
681         status = nfserr_inval;
682         if (!check_name(clname))
683                 goto out;
684
685         status = nfs4_make_rec_clidname(dname, &clname);
686         if (status)
687                 goto out;
688
689         /* 
690          * XXX The Duplicate Request Cache (DRC) has been checked (??)
691          * We get here on a DRC miss.
692          */
693
694         strhashval = clientstr_hashval(dname);
695
696         nfs4_lock_state();
697         conf = find_confirmed_client_by_str(dname, strhashval);
698         if (conf) {
699                 /* 
700                  * CASE 0:
701                  * clname match, confirmed, different principal
702                  * or different ip_address
703                  */
704                 status = nfserr_clid_inuse;
705                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706                                 || conf->cl_addr != ip_addr) {
707                         printk("NFSD: setclientid: string in use by client"
708                         "(clientid %08x/%08x)\n",
709                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
710                         goto out;
711                 }
712         }
713         unconf = find_unconfirmed_client_by_str(dname, strhashval);
714         status = nfserr_resource;
715         if (!conf) {
716                 /* 
717                  * CASE 4:
718                  * placed first, because it is the normal case.
719                  */
720                 if (unconf)
721                         expire_client(unconf);
722                 new = create_client(clname, dname);
723                 if (new == NULL)
724                         goto out;
725                 copy_verf(new, &clverifier);
726                 new->cl_addr = ip_addr;
727                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728                 gen_clid(new);
729                 gen_confirm(new);
730                 gen_callback(new, setclid);
731                 add_to_unconfirmed(new, strhashval);
732         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733                 /*
734                  * CASE 1:
735                  * cl_name match, confirmed, principal match
736                  * verifier match: probable callback update
737                  *
738                  * remove any unconfirmed nfs4_client with 
739                  * matching cl_name, cl_verifier, and cl_clientid
740                  *
741                  * create and insert an unconfirmed nfs4_client with same 
742                  * cl_name, cl_verifier, and cl_clientid as existing 
743                  * nfs4_client,  but with the new callback info and a 
744                  * new cl_confirm
745                  */
746                 if (unconf) {
747                         /* Note this is removing unconfirmed {*x***},
748                          * which is stronger than RFC recommended {vxc**}.
749                          * This has the advantage that there is at most
750                          * one {*x***} in either list at any time.
751                          */
752                         expire_client(unconf);
753                 }
754                 new = create_client(clname, dname);
755                 if (new == NULL)
756                         goto out;
757                 copy_verf(new,&conf->cl_verifier);
758                 new->cl_addr = ip_addr;
759                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760                 copy_clid(new, conf);
761                 gen_confirm(new);
762                 gen_callback(new, setclid);
763                 add_to_unconfirmed(new,strhashval);
764         } else if (!unconf) {
765                 /*
766                  * CASE 2:
767                  * clname match, confirmed, principal match
768                  * verfier does not match
769                  * no unconfirmed. create a new unconfirmed nfs4_client
770                  * using input clverifier, clname, and callback info
771                  * and generate a new cl_clientid and cl_confirm.
772                  */
773                 new = create_client(clname, dname);
774                 if (new == NULL)
775                         goto out;
776                 copy_verf(new,&clverifier);
777                 new->cl_addr = ip_addr;
778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779                 gen_clid(new);
780                 gen_confirm(new);
781                 gen_callback(new, setclid);
782                 add_to_unconfirmed(new, strhashval);
783         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784                 /*      
785                  * CASE3:
786                  * confirmed found (name, principal match)
787                  * confirmed verifier does not match input clverifier
788                  *
789                  * unconfirmed found (name match)
790                  * confirmed->cl_confirm != unconfirmed->cl_confirm
791                  *
792                  * remove unconfirmed.
793                  *
794                  * create an unconfirmed nfs4_client 
795                  * with same cl_name as existing confirmed nfs4_client, 
796                  * but with new callback info, new cl_clientid,
797                  * new cl_verifier and a new cl_confirm
798                  */
799                 expire_client(unconf);
800                 new = create_client(clname, dname);
801                 if (new == NULL)
802                         goto out;
803                 copy_verf(new,&clverifier);
804                 new->cl_addr = ip_addr;
805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806                 gen_clid(new);
807                 gen_confirm(new);
808                 gen_callback(new, setclid);
809                 add_to_unconfirmed(new, strhashval);
810         } else {
811                 /* No cases hit !!! */
812                 status = nfserr_inval;
813                 goto out;
814
815         }
816         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819         status = nfs_ok;
820 out:
821         nfs4_unlock_state();
822         return status;
823 }
824
825
826 /*
827  * RFC 3010 has a complex implmentation description of processing a 
828  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830  *
831  * NOTE: callback information will be processed here in a future patch
832  */
833 int
834 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835 {
836         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
837         struct nfs4_client *conf, *unconf;
838         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
839         clientid_t * clid = &setclientid_confirm->sc_clientid;
840         int status;
841
842         if (STALE_CLIENTID(clid))
843                 return nfserr_stale_clientid;
844         /* 
845          * XXX The Duplicate Request Cache (DRC) has been checked (??)
846          * We get here on a DRC miss.
847          */
848
849         nfs4_lock_state();
850
851         conf = find_confirmed_client(clid);
852         unconf = find_unconfirmed_client(clid);
853
854         status = nfserr_clid_inuse;
855         if (conf && conf->cl_addr != ip_addr)
856                 goto out;
857         if (unconf && unconf->cl_addr != ip_addr)
858                 goto out;
859
860         if ((conf && unconf) && 
861             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
862             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
863             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
864             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
865                 /* CASE 1:
866                 * unconf record that matches input clientid and input confirm.
867                 * conf record that matches input clientid.
868                 * conf and unconf records match names, verifiers
869                 */
870                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 
871                         status = nfserr_clid_inuse;
872                 else {
873                         /* XXX: We just turn off callbacks until we can handle
874                           * change request correctly. */
875                         atomic_set(&conf->cl_callback.cb_set, 0);
876                         gen_confirm(conf);
877                         nfsd4_remove_clid_dir(unconf);
878                         expire_client(unconf);
879                         status = nfs_ok;
880
881                 }
882         } else if ((conf && !unconf) ||
883             ((conf && unconf) && 
884              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
885               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
886                 /* CASE 2:
887                  * conf record that matches input clientid.
888                  * if unconf record matches input clientid, then
889                  * unconf->cl_name or unconf->cl_verifier don't match the
890                  * conf record.
891                  */
892                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
893                         status = nfserr_clid_inuse;
894                 else
895                         status = nfs_ok;
896         } else if (!conf && unconf
897                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
898                 /* CASE 3:
899                  * conf record not found.
900                  * unconf record found.
901                  * unconf->cl_confirm matches input confirm
902                  */
903                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
904                         status = nfserr_clid_inuse;
905                 } else {
906                         unsigned int hash =
907                                 clientstr_hashval(unconf->cl_recdir);
908                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
909                                                                         hash);
910                         if (conf) {
911                                 nfsd4_remove_clid_dir(conf);
912                                 expire_client(conf);
913                         }
914                         move_to_confirmed(unconf);
915                         conf = unconf;
916                         status = nfs_ok;
917                 }
918         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
919             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
920                                                                 &confirm)))) {
921                 /* CASE 4:
922                  * conf record not found, or if conf, conf->cl_confirm does not
923                  * match input confirm.
924                  * unconf record not found, or if unconf, unconf->cl_confirm
925                  * does not match input confirm.
926                  */
927                 status = nfserr_stale_clientid;
928         } else {
929                 /* check that we have hit one of the cases...*/
930                 status = nfserr_clid_inuse;
931         }
932 out:
933         if (!status)
934                 nfsd4_probe_callback(conf);
935         nfs4_unlock_state();
936         return status;
937 }
938
939 /* 
940  * Open owner state (share locks)
941  */
942
943 /* hash tables for nfs4_stateowner */
944 #define OWNER_HASH_BITS              8
945 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
946 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
947
948 #define ownerid_hashval(id) \
949         ((id) & OWNER_HASH_MASK)
950 #define ownerstr_hashval(clientid, ownername) \
951         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
952
953 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
954 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
955
956 /* hash table for nfs4_file */
957 #define FILE_HASH_BITS                   8
958 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
959 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
960 /* hash table for (open)nfs4_stateid */
961 #define STATEID_HASH_BITS              10
962 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
963 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
964
965 #define file_hashval(x) \
966         hash_ptr(x, FILE_HASH_BITS)
967 #define stateid_hashval(owner_id, file_id)  \
968         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
969
970 static struct list_head file_hashtbl[FILE_HASH_SIZE];
971 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
972
973 /* OPEN Share state helper functions */
974 static inline struct nfs4_file *
975 alloc_init_file(struct inode *ino)
976 {
977         struct nfs4_file *fp;
978         unsigned int hashval = file_hashval(ino);
979
980         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
981         if (fp) {
982                 kref_init(&fp->fi_ref);
983                 INIT_LIST_HEAD(&fp->fi_hash);
984                 INIT_LIST_HEAD(&fp->fi_stateids);
985                 INIT_LIST_HEAD(&fp->fi_delegations);
986                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
987                 fp->fi_inode = igrab(ino);
988                 fp->fi_id = current_fileid++;
989                 return fp;
990         }
991         return NULL;
992 }
993
994 static void
995 nfsd4_free_slab(kmem_cache_t **slab)
996 {
997         int status;
998
999         if (*slab == NULL)
1000                 return;
1001         status = kmem_cache_destroy(*slab);
1002         *slab = NULL;
1003         WARN_ON(status);
1004 }
1005
1006 static void
1007 nfsd4_free_slabs(void)
1008 {
1009         nfsd4_free_slab(&stateowner_slab);
1010         nfsd4_free_slab(&file_slab);
1011         nfsd4_free_slab(&stateid_slab);
1012         nfsd4_free_slab(&deleg_slab);
1013 }
1014
1015 static int
1016 nfsd4_init_slabs(void)
1017 {
1018         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1019                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1020         if (stateowner_slab == NULL)
1021                 goto out_nomem;
1022         file_slab = kmem_cache_create("nfsd4_files",
1023                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1024         if (file_slab == NULL)
1025                 goto out_nomem;
1026         stateid_slab = kmem_cache_create("nfsd4_stateids",
1027                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1028         if (stateid_slab == NULL)
1029                 goto out_nomem;
1030         deleg_slab = kmem_cache_create("nfsd4_delegations",
1031                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1032         if (deleg_slab == NULL)
1033                 goto out_nomem;
1034         return 0;
1035 out_nomem:
1036         nfsd4_free_slabs();
1037         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1038         return -ENOMEM;
1039 }
1040
1041 void
1042 nfs4_free_stateowner(struct kref *kref)
1043 {
1044         struct nfs4_stateowner *sop =
1045                 container_of(kref, struct nfs4_stateowner, so_ref);
1046         kfree(sop->so_owner.data);
1047         kmem_cache_free(stateowner_slab, sop);
1048 }
1049
1050 static inline struct nfs4_stateowner *
1051 alloc_stateowner(struct xdr_netobj *owner)
1052 {
1053         struct nfs4_stateowner *sop;
1054
1055         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1056                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1057                         memcpy(sop->so_owner.data, owner->data, owner->len);
1058                         sop->so_owner.len = owner->len;
1059                         kref_init(&sop->so_ref);
1060                         return sop;
1061                 } 
1062                 kmem_cache_free(stateowner_slab, sop);
1063         }
1064         return NULL;
1065 }
1066
1067 static struct nfs4_stateowner *
1068 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1069         struct nfs4_stateowner *sop;
1070         struct nfs4_replay *rp;
1071         unsigned int idhashval;
1072
1073         if (!(sop = alloc_stateowner(&open->op_owner)))
1074                 return NULL;
1075         idhashval = ownerid_hashval(current_ownerid);
1076         INIT_LIST_HEAD(&sop->so_idhash);
1077         INIT_LIST_HEAD(&sop->so_strhash);
1078         INIT_LIST_HEAD(&sop->so_perclient);
1079         INIT_LIST_HEAD(&sop->so_stateids);
1080         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1081         INIT_LIST_HEAD(&sop->so_close_lru);
1082         sop->so_time = 0;
1083         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1084         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1085         list_add(&sop->so_perclient, &clp->cl_openowners);
1086         sop->so_is_open_owner = 1;
1087         sop->so_id = current_ownerid++;
1088         sop->so_client = clp;
1089         sop->so_seqid = open->op_seqid;
1090         sop->so_confirmed = 0;
1091         rp = &sop->so_replay;
1092         rp->rp_status = NFSERR_SERVERFAULT;
1093         rp->rp_buflen = 0;
1094         rp->rp_buf = rp->rp_ibuf;
1095         return sop;
1096 }
1097
1098 static void
1099 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1100 {
1101         struct nfs4_stateowner *lock_sop;
1102
1103         while (!list_empty(&open_stp->st_lockowners)) {
1104                 lock_sop = list_entry(open_stp->st_lockowners.next,
1105                                 struct nfs4_stateowner, so_perstateid);
1106                 /* list_del(&open_stp->st_lockowners);  */
1107                 BUG_ON(lock_sop->so_is_open_owner);
1108                 release_stateowner(lock_sop);
1109         }
1110 }
1111
1112 static void
1113 unhash_stateowner(struct nfs4_stateowner *sop)
1114 {
1115         struct nfs4_stateid *stp;
1116
1117         list_del(&sop->so_idhash);
1118         list_del(&sop->so_strhash);
1119         if (sop->so_is_open_owner)
1120                 list_del(&sop->so_perclient);
1121         list_del(&sop->so_perstateid);
1122         while (!list_empty(&sop->so_stateids)) {
1123                 stp = list_entry(sop->so_stateids.next,
1124                         struct nfs4_stateid, st_perstateowner);
1125                 if (sop->so_is_open_owner)
1126                         release_stateid(stp, OPEN_STATE);
1127                 else
1128                         release_stateid(stp, LOCK_STATE);
1129         }
1130 }
1131
1132 static void
1133 release_stateowner(struct nfs4_stateowner *sop)
1134 {
1135         unhash_stateowner(sop);
1136         list_del(&sop->so_close_lru);
1137         nfs4_put_stateowner(sop);
1138 }
1139
1140 static inline void
1141 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1142         struct nfs4_stateowner *sop = open->op_stateowner;
1143         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1144
1145         INIT_LIST_HEAD(&stp->st_hash);
1146         INIT_LIST_HEAD(&stp->st_perstateowner);
1147         INIT_LIST_HEAD(&stp->st_lockowners);
1148         INIT_LIST_HEAD(&stp->st_perfile);
1149         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1150         list_add(&stp->st_perstateowner, &sop->so_stateids);
1151         list_add(&stp->st_perfile, &fp->fi_stateids);
1152         stp->st_stateowner = sop;
1153         get_nfs4_file(fp);
1154         stp->st_file = fp;
1155         stp->st_stateid.si_boot = boot_time;
1156         stp->st_stateid.si_stateownerid = sop->so_id;
1157         stp->st_stateid.si_fileid = fp->fi_id;
1158         stp->st_stateid.si_generation = 0;
1159         stp->st_access_bmap = 0;
1160         stp->st_deny_bmap = 0;
1161         __set_bit(open->op_share_access, &stp->st_access_bmap);
1162         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1163 }
1164
1165 static void
1166 release_stateid(struct nfs4_stateid *stp, int flags)
1167 {
1168         struct file *filp = stp->st_vfs_file;
1169
1170         list_del(&stp->st_hash);
1171         list_del(&stp->st_perfile);
1172         list_del(&stp->st_perstateowner);
1173         if (flags & OPEN_STATE) {
1174                 release_stateid_lockowners(stp);
1175                 stp->st_vfs_file = NULL;
1176                 nfsd_close(filp);
1177         } else if (flags & LOCK_STATE)
1178                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1179         put_nfs4_file(stp->st_file);
1180         kmem_cache_free(stateid_slab, stp);
1181         stp = NULL;
1182 }
1183
1184 static void
1185 move_to_close_lru(struct nfs4_stateowner *sop)
1186 {
1187         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1188
1189         unhash_stateowner(sop);
1190         list_add_tail(&sop->so_close_lru, &close_lru);
1191         sop->so_time = get_seconds();
1192 }
1193
1194 static void
1195 release_state_owner(struct nfs4_stateid *stp, int flag)
1196 {
1197         struct nfs4_stateowner *sop = stp->st_stateowner;
1198
1199         dprintk("NFSD: release_state_owner\n");
1200         release_stateid(stp, flag);
1201
1202         /* place unused nfs4_stateowners on so_close_lru list to be
1203          * released by the laundromat service after the lease period
1204          * to enable us to handle CLOSE replay
1205          */
1206         if (sop->so_confirmed && list_empty(&sop->so_stateids))
1207                 move_to_close_lru(sop);
1208 }
1209
1210 static int
1211 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1212         return ((sop->so_owner.len == owner->len) && 
1213          !memcmp(sop->so_owner.data, owner->data, owner->len) && 
1214           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1215 }
1216
1217 static struct nfs4_stateowner *
1218 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1219 {
1220         struct nfs4_stateowner *so = NULL;
1221
1222         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1223                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1224                         return so;
1225         }
1226         return NULL;
1227 }
1228
1229 /* search file_hashtbl[] for file */
1230 static struct nfs4_file *
1231 find_file(struct inode *ino)
1232 {
1233         unsigned int hashval = file_hashval(ino);
1234         struct nfs4_file *fp;
1235
1236         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1237                 if (fp->fi_inode == ino) {
1238                         get_nfs4_file(fp);
1239                         return fp;
1240                 }
1241         }
1242         return NULL;
1243 }
1244
1245 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1246 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1247
1248 static void
1249 set_access(unsigned int *access, unsigned long bmap) {
1250         int i;
1251
1252         *access = 0;
1253         for (i = 1; i < 4; i++) {
1254                 if (test_bit(i, &bmap))
1255                         *access |= i;
1256         }
1257 }
1258
1259 static void
1260 set_deny(unsigned int *deny, unsigned long bmap) {
1261         int i;
1262
1263         *deny = 0;
1264         for (i = 0; i < 4; i++) {
1265                 if (test_bit(i, &bmap))
1266                         *deny |= i ;
1267         }
1268 }
1269
1270 static int
1271 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1272         unsigned int access, deny;
1273
1274         set_access(&access, stp->st_access_bmap);
1275         set_deny(&deny, stp->st_deny_bmap);
1276         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1277                 return 0;
1278         return 1;
1279 }
1280
1281 /*
1282  * Called to check deny when READ with all zero stateid or
1283  * WRITE with all zero or all one stateid
1284  */
1285 static int
1286 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1287 {
1288         struct inode *ino = current_fh->fh_dentry->d_inode;
1289         struct nfs4_file *fp;
1290         struct nfs4_stateid *stp;
1291         int ret;
1292
1293         dprintk("NFSD: nfs4_share_conflict\n");
1294
1295         fp = find_file(ino);
1296         if (!fp)
1297                 return nfs_ok;
1298         ret = nfserr_share_denied;
1299         /* Search for conflicting share reservations */
1300         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1301                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1302                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1303                         goto out;
1304         }
1305         ret = nfs_ok;
1306 out:
1307         put_nfs4_file(fp);
1308         return ret;
1309 }
1310
1311 static inline void
1312 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1313 {
1314         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1315                 put_write_access(filp->f_dentry->d_inode);
1316                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1317         }
1318 }
1319
1320 /*
1321  * Recall a delegation
1322  */
1323 static int
1324 do_recall(void *__dp)
1325 {
1326         struct nfs4_delegation *dp = __dp;
1327
1328         daemonize("nfsv4-recall");
1329
1330         nfsd4_cb_recall(dp);
1331         return 0;
1332 }
1333
1334 /*
1335  * Spawn a thread to perform a recall on the delegation represented
1336  * by the lease (file_lock)
1337  *
1338  * Called from break_lease() with lock_kernel() held.
1339  * Note: we assume break_lease will only call this *once* for any given
1340  * lease.
1341  */
1342 static
1343 void nfsd_break_deleg_cb(struct file_lock *fl)
1344 {
1345         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1346         struct task_struct *t;
1347
1348         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1349         if (!dp)
1350                 return;
1351
1352         /* We're assuming the state code never drops its reference
1353          * without first removing the lease.  Since we're in this lease
1354          * callback (and since the lease code is serialized by the kernel
1355          * lock) we know the server hasn't removed the lease yet, we know
1356          * it's safe to take a reference: */
1357         atomic_inc(&dp->dl_count);
1358
1359         spin_lock(&recall_lock);
1360         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1361         spin_unlock(&recall_lock);
1362
1363         /* only place dl_time is set. protected by lock_kernel*/
1364         dp->dl_time = get_seconds();
1365
1366         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1367         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1368
1369         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1370         if (IS_ERR(t)) {
1371                 struct nfs4_client *clp = dp->dl_client;
1372
1373                 printk(KERN_INFO "NFSD: Callback thread failed for "
1374                         "for client (clientid %08x/%08x)\n",
1375                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1376                 nfs4_put_delegation(dp);
1377         }
1378 }
1379
1380 /*
1381  * The file_lock is being reapd.
1382  *
1383  * Called by locks_free_lock() with lock_kernel() held.
1384  */
1385 static
1386 void nfsd_release_deleg_cb(struct file_lock *fl)
1387 {
1388         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1389
1390         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1391
1392         if (!(fl->fl_flags & FL_LEASE) || !dp)
1393                 return;
1394         dp->dl_flock = NULL;
1395 }
1396
1397 /*
1398  * Set the delegation file_lock back pointer.
1399  *
1400  * Called from __setlease() with lock_kernel() held.
1401  */
1402 static
1403 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1404 {
1405         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1406
1407         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1408         if (!dp)
1409                 return;
1410         dp->dl_flock = new;
1411 }
1412
1413 /*
1414  * Called from __setlease() with lock_kernel() held
1415  */
1416 static
1417 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1418 {
1419         struct nfs4_delegation *onlistd =
1420                 (struct nfs4_delegation *)onlist->fl_owner;
1421         struct nfs4_delegation *tryd =
1422                 (struct nfs4_delegation *)try->fl_owner;
1423
1424         if (onlist->fl_lmops != try->fl_lmops)
1425                 return 0;
1426
1427         return onlistd->dl_client == tryd->dl_client;
1428 }
1429
1430
1431 static
1432 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1433 {
1434         if (arg & F_UNLCK)
1435                 return lease_modify(onlist, arg);
1436         else
1437                 return -EAGAIN;
1438 }
1439
1440 static struct lock_manager_operations nfsd_lease_mng_ops = {
1441         .fl_break = nfsd_break_deleg_cb,
1442         .fl_release_private = nfsd_release_deleg_cb,
1443         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1444         .fl_mylease = nfsd_same_client_deleg_cb,
1445         .fl_change = nfsd_change_deleg_cb,
1446 };
1447
1448
1449 /*
1450  * nfsd4_process_open1()
1451  *      lookup stateowner.
1452  *              found:
1453  *                      check confirmed 
1454  *                              confirmed:
1455  *                                      check seqid
1456  *                              not confirmed:
1457  *                                      delete owner
1458  *                                      create new owner
1459  *              notfound:
1460  *                      verify clientid
1461  *                      create new owner
1462  *
1463  * called with nfs4_lock_state() held.
1464  */
1465 int
1466 nfsd4_process_open1(struct nfsd4_open *open)
1467 {
1468         int status;
1469         clientid_t *clientid = &open->op_clientid;
1470         struct nfs4_client *clp = NULL;
1471         unsigned int strhashval;
1472         struct nfs4_stateowner *sop = NULL;
1473
1474         status = nfserr_inval;
1475         if (!check_name(open->op_owner))
1476                 goto out;
1477
1478         if (STALE_CLIENTID(&open->op_clientid))
1479                 return nfserr_stale_clientid;
1480
1481         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1482         sop = find_openstateowner_str(strhashval, open);
1483         if (sop) {
1484                 open->op_stateowner = sop;
1485                 /* check for replay */
1486                 if (open->op_seqid == sop->so_seqid){
1487                         if (sop->so_replay.rp_buflen)
1488                                 return NFSERR_REPLAY_ME;
1489                         else {
1490                                 /* The original OPEN failed so spectacularly
1491                                  * that we don't even have replay data saved!
1492                                  * Therefore, we have no choice but to continue
1493                                  * processing this OPEN; presumably, we'll
1494                                  * fail again for the same reason.
1495                                  */
1496                                 dprintk("nfsd4_process_open1:"
1497                                         " replay with no replay cache\n");
1498                                 goto renew;
1499                         }
1500                 } else if (sop->so_confirmed) {
1501                         if (open->op_seqid == sop->so_seqid + 1)
1502                                 goto renew;
1503                         status = nfserr_bad_seqid;
1504                         goto out;
1505                 } else {
1506                         /* If we get here, we received an OPEN for an
1507                          * unconfirmed nfs4_stateowner. Since the seqid's are
1508                          * different, purge the existing nfs4_stateowner, and
1509                          * instantiate a new one.
1510                          */
1511                         clp = sop->so_client;
1512                         release_stateowner(sop);
1513                 }
1514         } else {
1515                 /* nfs4_stateowner not found.
1516                  * Verify clientid and instantiate new nfs4_stateowner.
1517                  * If verify fails this is presumably the result of the
1518                  * client's lease expiring.
1519                  */
1520                 status = nfserr_expired;
1521                 clp = find_confirmed_client(clientid);
1522                 if (clp == NULL)
1523                         goto out;
1524         }
1525         status = nfserr_resource;
1526         sop = alloc_init_open_stateowner(strhashval, clp, open);
1527         if (sop == NULL)
1528                 goto out;
1529         open->op_stateowner = sop;
1530 renew:
1531         status = nfs_ok;
1532         renew_client(sop->so_client);
1533 out:
1534         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1535                 status = nfserr_reclaim_bad;
1536         return status;
1537 }
1538
1539 static inline int
1540 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1541 {
1542         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1543                 return nfserr_openmode;
1544         else
1545                 return nfs_ok;
1546 }
1547
1548 static struct nfs4_delegation *
1549 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1550 {
1551         struct nfs4_delegation *dp;
1552
1553         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1554                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1555                         return dp;
1556         }
1557         return NULL;
1558 }
1559
1560 static int
1561 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1562                 struct nfs4_delegation **dp)
1563 {
1564         int flags;
1565         int status = nfserr_bad_stateid;
1566
1567         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1568         if (*dp == NULL)
1569                 goto out;
1570         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1571                                                 RD_STATE : WR_STATE;
1572         status = nfs4_check_delegmode(*dp, flags);
1573         if (status)
1574                 *dp = NULL;
1575 out:
1576         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1577                 return nfs_ok;
1578         if (status)
1579                 return status;
1580         open->op_stateowner->so_confirmed = 1;
1581         return nfs_ok;
1582 }
1583
1584 static int
1585 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1586 {
1587         struct nfs4_stateid *local;
1588         int status = nfserr_share_denied;
1589         struct nfs4_stateowner *sop = open->op_stateowner;
1590
1591         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1592                 /* ignore lock owners */
1593                 if (local->st_stateowner->so_is_open_owner == 0)
1594                         continue;
1595                 /* remember if we have seen this open owner */
1596                 if (local->st_stateowner == sop)
1597                         *stpp = local;
1598                 /* check for conflicting share reservations */
1599                 if (!test_share(local, open))
1600                         goto out;
1601         }
1602         status = 0;
1603 out:
1604         return status;
1605 }
1606
1607 static inline struct nfs4_stateid *
1608 nfs4_alloc_stateid(void)
1609 {
1610         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1611 }
1612
1613 static int
1614 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1615                 struct nfs4_delegation *dp,
1616                 struct svc_fh *cur_fh, int flags)
1617 {
1618         struct nfs4_stateid *stp;
1619
1620         stp = nfs4_alloc_stateid();
1621         if (stp == NULL)
1622                 return nfserr_resource;
1623
1624         if (dp) {
1625                 get_file(dp->dl_vfs_file);
1626                 stp->st_vfs_file = dp->dl_vfs_file;
1627         } else {
1628                 int status;
1629                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1630                                 &stp->st_vfs_file);
1631                 if (status) {
1632                         if (status == nfserr_dropit)
1633                                 status = nfserr_jukebox;
1634                         kmem_cache_free(stateid_slab, stp);
1635                         return status;
1636                 }
1637         }
1638         *stpp = stp;
1639         return 0;
1640 }
1641
1642 static inline int
1643 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1644                 struct nfsd4_open *open)
1645 {
1646         struct iattr iattr = {
1647                 .ia_valid = ATTR_SIZE,
1648                 .ia_size = 0,
1649         };
1650         if (!open->op_truncate)
1651                 return 0;
1652         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1653                 return -EINVAL;
1654         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1655 }
1656
1657 static int
1658 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1659 {
1660         struct file *filp = stp->st_vfs_file;
1661         struct inode *inode = filp->f_dentry->d_inode;
1662         unsigned int share_access;
1663         int status;
1664
1665         set_access(&share_access, stp->st_access_bmap);
1666         share_access = ~share_access;
1667         share_access &= open->op_share_access;
1668
1669         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1670                 return nfsd4_truncate(rqstp, cur_fh, open);
1671
1672         status = get_write_access(inode);
1673         if (status)
1674                 return nfserrno(status);
1675         status = nfsd4_truncate(rqstp, cur_fh, open);
1676         if (status) {
1677                 put_write_access(inode);
1678                 return status;
1679         }
1680         /* remember the open */
1681         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1682         set_bit(open->op_share_access, &stp->st_access_bmap);
1683         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1684
1685         return nfs_ok;
1686 }
1687
1688
1689 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1690 static void
1691 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1692 {
1693         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1694                 if (*status)
1695                         *status = nfserr_reclaim_bad;
1696                 else {
1697                         open->op_stateowner->so_confirmed = 1;
1698                         open->op_stateowner->so_client->cl_firststate = 1;
1699                         open->op_stateowner->so_seqid--;
1700                 }
1701         }
1702 }
1703
1704 /*
1705  * Attempt to hand out a delegation.
1706  */
1707 static void
1708 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1709 {
1710         struct nfs4_delegation *dp;
1711         struct nfs4_stateowner *sop = stp->st_stateowner;
1712         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1713         struct file_lock fl, *flp = &fl;
1714         int status, flag = 0;
1715
1716         flag = NFS4_OPEN_DELEGATE_NONE;
1717         open->op_recall = 0;
1718         switch (open->op_claim_type) {
1719                 case NFS4_OPEN_CLAIM_PREVIOUS:
1720                         if (!atomic_read(&cb->cb_set))
1721                                 open->op_recall = 1;
1722                         flag = open->op_delegate_type;
1723                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1724                                 goto out;
1725                         break;
1726                 case NFS4_OPEN_CLAIM_NULL:
1727                         /* Let's not give out any delegations till everyone's
1728                          * had the chance to reclaim theirs.... */
1729                         if (nfs4_in_grace())
1730                                 goto out;
1731                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1732                                 goto out;
1733                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1734                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1735                         else
1736                                 flag = NFS4_OPEN_DELEGATE_READ;
1737                         break;
1738                 default:
1739                         goto out;
1740         }
1741
1742         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1743         if (dp == NULL) {
1744                 flag = NFS4_OPEN_DELEGATE_NONE;
1745                 goto out;
1746         }
1747         locks_init_lock(&fl);
1748         fl.fl_lmops = &nfsd_lease_mng_ops;
1749         fl.fl_flags = FL_LEASE;
1750         fl.fl_end = OFFSET_MAX;
1751         fl.fl_owner =  (fl_owner_t)dp;
1752         fl.fl_file = stp->st_vfs_file;
1753         fl.fl_pid = current->tgid;
1754
1755         /* setlease checks to see if delegation should be handed out.
1756          * the lock_manager callbacks fl_mylease and fl_change are used
1757          */
1758         if ((status = setlease(stp->st_vfs_file,
1759                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1760                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1761                 unhash_delegation(dp);
1762                 flag = NFS4_OPEN_DELEGATE_NONE;
1763                 goto out;
1764         }
1765
1766         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1767
1768         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1769                      dp->dl_stateid.si_boot,
1770                      dp->dl_stateid.si_stateownerid,
1771                      dp->dl_stateid.si_fileid,
1772                      dp->dl_stateid.si_generation);
1773 out:
1774         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1775                         && flag == NFS4_OPEN_DELEGATE_NONE
1776                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1777                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1778         open->op_delegate_type = flag;
1779 }
1780
1781 /*
1782  * called with nfs4_lock_state() held.
1783  */
1784 int
1785 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1786 {
1787         struct nfs4_file *fp = NULL;
1788         struct inode *ino = current_fh->fh_dentry->d_inode;
1789         struct nfs4_stateid *stp = NULL;
1790         struct nfs4_delegation *dp = NULL;
1791         int status;
1792
1793         status = nfserr_inval;
1794         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1795                 goto out;
1796         /*
1797          * Lookup file; if found, lookup stateid and check open request,
1798          * and check for delegations in the process of being recalled.
1799          * If not found, create the nfs4_file struct
1800          */
1801         fp = find_file(ino);
1802         if (fp) {
1803                 if ((status = nfs4_check_open(fp, open, &stp)))
1804                         goto out;
1805                 status = nfs4_check_deleg(fp, open, &dp);
1806                 if (status)
1807                         goto out;
1808         } else {
1809                 status = nfserr_bad_stateid;
1810                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1811                         goto out;
1812                 status = nfserr_resource;
1813                 fp = alloc_init_file(ino);
1814                 if (fp == NULL)
1815                         goto out;
1816         }
1817
1818         /*
1819          * OPEN the file, or upgrade an existing OPEN.
1820          * If truncate fails, the OPEN fails.
1821          */
1822         if (stp) {
1823                 /* Stateid was found, this is an OPEN upgrade */
1824                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1825                 if (status)
1826                         goto out;
1827         } else {
1828                 /* Stateid was not found, this is a new OPEN */
1829                 int flags = 0;
1830                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1831                         flags = MAY_WRITE;
1832                 else
1833                         flags = MAY_READ;
1834                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1835                 if (status)
1836                         goto out;
1837                 init_stateid(stp, fp, open);
1838                 status = nfsd4_truncate(rqstp, current_fh, open);
1839                 if (status) {
1840                         release_stateid(stp, OPEN_STATE);
1841                         goto out;
1842                 }
1843         }
1844         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1845
1846         /*
1847         * Attempt to hand out a delegation. No error return, because the
1848         * OPEN succeeds even if we fail.
1849         */
1850         nfs4_open_delegation(current_fh, open, stp);
1851
1852         status = nfs_ok;
1853
1854         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1855                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1856                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1857 out:
1858         if (fp)
1859                 put_nfs4_file(fp);
1860         /* CLAIM_PREVIOUS has different error returns */
1861         nfs4_set_claim_prev(open, &status);
1862         /*
1863         * To finish the open response, we just need to set the rflags.
1864         */
1865         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1866         if (!open->op_stateowner->so_confirmed)
1867                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1868
1869         return status;
1870 }
1871
1872 static struct workqueue_struct *laundry_wq;
1873 static struct work_struct laundromat_work;
1874 static void laundromat_main(void *);
1875 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1876
1877 int 
1878 nfsd4_renew(clientid_t *clid)
1879 {
1880         struct nfs4_client *clp;
1881         int status;
1882
1883         nfs4_lock_state();
1884         dprintk("process_renew(%08x/%08x): starting\n", 
1885                         clid->cl_boot, clid->cl_id);
1886         status = nfserr_stale_clientid;
1887         if (STALE_CLIENTID(clid))
1888                 goto out;
1889         clp = find_confirmed_client(clid);
1890         status = nfserr_expired;
1891         if (clp == NULL) {
1892                 /* We assume the client took too long to RENEW. */
1893                 dprintk("nfsd4_renew: clientid not found!\n");
1894                 goto out;
1895         }
1896         renew_client(clp);
1897         status = nfserr_cb_path_down;
1898         if (!list_empty(&clp->cl_delegations)
1899                         && !atomic_read(&clp->cl_callback.cb_set))
1900                 goto out;
1901         status = nfs_ok;
1902 out:
1903         nfs4_unlock_state();
1904         return status;
1905 }
1906
1907 static void
1908 end_grace(void)
1909 {
1910         dprintk("NFSD: end of grace period\n");
1911         nfsd4_recdir_purge_old();
1912         in_grace = 0;
1913 }
1914
1915 static time_t
1916 nfs4_laundromat(void)
1917 {
1918         struct nfs4_client *clp;
1919         struct nfs4_stateowner *sop;
1920         struct nfs4_delegation *dp;
1921         struct list_head *pos, *next, reaplist;
1922         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1923         time_t t, clientid_val = NFSD_LEASE_TIME;
1924         time_t u, test_val = NFSD_LEASE_TIME;
1925
1926         nfs4_lock_state();
1927
1928         dprintk("NFSD: laundromat service - starting\n");
1929         if (in_grace)
1930                 end_grace();
1931         list_for_each_safe(pos, next, &client_lru) {
1932                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1933                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1934                         t = clp->cl_time - cutoff;
1935                         if (clientid_val > t)
1936                                 clientid_val = t;
1937                         break;
1938                 }
1939                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1940                         clp->cl_clientid.cl_id);
1941                 nfsd4_remove_clid_dir(clp);
1942                 expire_client(clp);
1943         }
1944         INIT_LIST_HEAD(&reaplist);
1945         spin_lock(&recall_lock);
1946         list_for_each_safe(pos, next, &del_recall_lru) {
1947                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1948                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1949                         u = dp->dl_time - cutoff;
1950                         if (test_val > u)
1951                                 test_val = u;
1952                         break;
1953                 }
1954                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1955                                     dp, dp->dl_flock);
1956                 list_move(&dp->dl_recall_lru, &reaplist);
1957         }
1958         spin_unlock(&recall_lock);
1959         list_for_each_safe(pos, next, &reaplist) {
1960                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1961                 list_del_init(&dp->dl_recall_lru);
1962                 unhash_delegation(dp);
1963         }
1964         test_val = NFSD_LEASE_TIME;
1965         list_for_each_safe(pos, next, &close_lru) {
1966                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1967                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1968                         u = sop->so_time - cutoff;
1969                         if (test_val > u)
1970                                 test_val = u;
1971                         break;
1972                 }
1973                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1974                         sop->so_id);
1975                 list_del(&sop->so_close_lru);
1976                 nfs4_put_stateowner(sop);
1977         }
1978         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1979                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1980         nfs4_unlock_state();
1981         return clientid_val;
1982 }
1983
1984 void
1985 laundromat_main(void *not_used)
1986 {
1987         time_t t;
1988
1989         t = nfs4_laundromat();
1990         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1991         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1992 }
1993
1994 /* search ownerid_hashtbl[] and close_lru for stateid owner
1995  * (stateid->si_stateownerid)
1996  */
1997 static struct nfs4_stateowner *
1998 find_openstateowner_id(u32 st_id, int flags) {
1999         struct nfs4_stateowner *local = NULL;
2000
2001         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2002         if (flags & CLOSE_STATE) {
2003                 list_for_each_entry(local, &close_lru, so_close_lru) {
2004                         if (local->so_id == st_id)
2005                                 return local;
2006                 }
2007         }
2008         return NULL;
2009 }
2010
2011 static inline int
2012 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2013 {
2014         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2015 }
2016
2017 static int
2018 STALE_STATEID(stateid_t *stateid)
2019 {
2020         if (stateid->si_boot == boot_time)
2021                 return 0;
2022         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2023                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2024                 stateid->si_generation);
2025         return 1;
2026 }
2027
2028 static inline int
2029 access_permit_read(unsigned long access_bmap)
2030 {
2031         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2032                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2033                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2034 }
2035
2036 static inline int
2037 access_permit_write(unsigned long access_bmap)
2038 {
2039         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2040                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2041 }
2042
2043 static
2044 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2045 {
2046         int status = nfserr_openmode;
2047
2048         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2049                 goto out;
2050         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2051                 goto out;
2052         status = nfs_ok;
2053 out:
2054         return status;
2055 }
2056
2057 static inline int
2058 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2059 {
2060         /* Trying to call delegreturn with a special stateid? Yuch: */
2061         if (!(flags & (RD_STATE | WR_STATE)))
2062                 return nfserr_bad_stateid;
2063         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2064                 return nfs_ok;
2065         else if (nfs4_in_grace()) {
2066                 /* Answer in remaining cases depends on existance of
2067                  * conflicting state; so we must wait out the grace period. */
2068                 return nfserr_grace;
2069         } else if (flags & WR_STATE)
2070                 return nfs4_share_conflict(current_fh,
2071                                 NFS4_SHARE_DENY_WRITE);
2072         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2073                 return nfs4_share_conflict(current_fh,
2074                                 NFS4_SHARE_DENY_READ);
2075 }
2076
2077 /*
2078  * Allow READ/WRITE during grace period on recovered state only for files
2079  * that are not able to provide mandatory locking.
2080  */
2081 static inline int
2082 io_during_grace_disallowed(struct inode *inode, int flags)
2083 {
2084         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2085                 && MANDATORY_LOCK(inode);
2086 }
2087
2088 /*
2089 * Checks for stateid operations
2090 */
2091 int
2092 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2093 {
2094         struct nfs4_stateid *stp = NULL;
2095         struct nfs4_delegation *dp = NULL;
2096         stateid_t *stidp;
2097         struct inode *ino = current_fh->fh_dentry->d_inode;
2098         int status;
2099
2100         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2101                 stateid->si_boot, stateid->si_stateownerid, 
2102                 stateid->si_fileid, stateid->si_generation); 
2103         if (filpp)
2104                 *filpp = NULL;
2105
2106         if (io_during_grace_disallowed(ino, flags))
2107                 return nfserr_grace;
2108
2109         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2110                 return check_special_stateids(current_fh, stateid, flags);
2111
2112         /* STALE STATEID */
2113         status = nfserr_stale_stateid;
2114         if (STALE_STATEID(stateid)) 
2115                 goto out;
2116
2117         /* BAD STATEID */
2118         status = nfserr_bad_stateid;
2119         if (!stateid->si_fileid) { /* delegation stateid */
2120                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2121                         dprintk("NFSD: delegation stateid not found\n");
2122                         if (nfs4_in_grace())
2123                                 status = nfserr_grace;
2124                         goto out;
2125                 }
2126                 stidp = &dp->dl_stateid;
2127         } else { /* open or lock stateid */
2128                 if (!(stp = find_stateid(stateid, flags))) {
2129                         dprintk("NFSD: open or lock stateid not found\n");
2130                         if (nfs4_in_grace())
2131                                 status = nfserr_grace;
2132                         goto out;
2133                 }
2134                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2135                         goto out;
2136                 if (!stp->st_stateowner->so_confirmed)
2137                         goto out;
2138                 stidp = &stp->st_stateid;
2139         }
2140         if (stateid->si_generation > stidp->si_generation)
2141                 goto out;
2142
2143         /* OLD STATEID */
2144         status = nfserr_old_stateid;
2145         if (stateid->si_generation < stidp->si_generation)
2146                 goto out;
2147         if (stp) {
2148                 if ((status = nfs4_check_openmode(stp,flags)))
2149                         goto out;
2150                 renew_client(stp->st_stateowner->so_client);
2151                 if (filpp)
2152                         *filpp = stp->st_vfs_file;
2153         } else if (dp) {
2154                 if ((status = nfs4_check_delegmode(dp, flags)))
2155                         goto out;
2156                 renew_client(dp->dl_client);
2157                 if (flags & DELEG_RET)
2158                         unhash_delegation(dp);
2159                 if (filpp)
2160                         *filpp = dp->dl_vfs_file;
2161         }
2162         status = nfs_ok;
2163 out:
2164         return status;
2165 }
2166
2167
2168 /* 
2169  * Checks for sequence id mutating operations. 
2170  */
2171 static int
2172 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2173 {
2174         int status;
2175         struct nfs4_stateid *stp;
2176         struct nfs4_stateowner *sop;
2177
2178         dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
2179                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2180                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2181                 stateid->si_generation);
2182                                 
2183         *stpp = NULL;
2184         *sopp = NULL;
2185
2186         status = nfserr_bad_stateid;
2187         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2188                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2189                 goto out;
2190         }
2191
2192         status = nfserr_stale_stateid;
2193         if (STALE_STATEID(stateid))
2194                 goto out;
2195         /*
2196         * We return BAD_STATEID if filehandle doesn't match stateid, 
2197         * the confirmed flag is incorrecly set, or the generation 
2198         * number is incorrect.  
2199         * If there is no entry in the openfile table for this id, 
2200         * we can't always return BAD_STATEID;
2201         * this might be a retransmitted CLOSE which has arrived after 
2202         * the openfile has been released.
2203         */
2204         if (!(stp = find_stateid(stateid, flags)))
2205                 goto no_nfs4_stateid;
2206
2207         status = nfserr_bad_stateid;
2208
2209         /* for new lock stateowners:
2210          * check that the lock->v.new.open_stateid
2211          * refers to an open stateowner
2212          *
2213          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2214          * as the open_stateid->st_stateowner->so_client->clientid
2215          */
2216         if (lockclid) {
2217                 struct nfs4_stateowner *sop = stp->st_stateowner;
2218                 struct nfs4_client *clp = sop->so_client;
2219
2220                 if (!sop->so_is_open_owner)
2221                         goto out;
2222                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2223                         goto out;
2224         }
2225
2226         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2227                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2228                 goto out;
2229         }
2230
2231         *stpp = stp;
2232         *sopp = sop = stp->st_stateowner;
2233
2234         /*
2235         *  We now validate the seqid and stateid generation numbers.
2236         *  For the moment, we ignore the possibility of 
2237         *  generation number wraparound.
2238         */
2239         if (seqid != sop->so_seqid + 1)
2240                 goto check_replay;
2241
2242         if (sop->so_confirmed) {
2243                 if (flags & CONFIRM) {
2244                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2245                         goto out;
2246                 }
2247         }
2248         else {
2249                 if (!(flags & CONFIRM)) {
2250                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2251                         goto out;
2252                 }
2253         }
2254         if (stateid->si_generation > stp->st_stateid.si_generation) {
2255                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2256                 goto out;
2257         }
2258
2259         status = nfserr_old_stateid;
2260         if (stateid->si_generation < stp->st_stateid.si_generation) {
2261                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2262                 goto out;
2263         }
2264         /* XXX renew the client lease here */
2265         status = nfs_ok;
2266
2267 out:
2268         return status;
2269
2270 no_nfs4_stateid:
2271
2272         /*
2273         * We determine whether this is a bad stateid or a replay, 
2274         * starting by trying to look up the stateowner.
2275         * If stateowner is not found - stateid is bad.
2276         */
2277         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2278                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2279                 status = nfserr_bad_stateid;
2280                 goto out;
2281         }
2282         *sopp = sop;
2283
2284 check_replay:
2285         if (seqid == sop->so_seqid) {
2286                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2287                 /* indicate replay to calling function */
2288                 status = NFSERR_REPLAY_ME;
2289         } else  {
2290                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2291
2292                 *sopp = NULL;
2293                 status = nfserr_bad_seqid;
2294         }
2295         goto out;
2296 }
2297
2298 int
2299 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2300 {
2301         int status;
2302         struct nfs4_stateowner *sop;
2303         struct nfs4_stateid *stp;
2304
2305         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2306                         (int)current_fh->fh_dentry->d_name.len,
2307                         current_fh->fh_dentry->d_name.name);
2308
2309         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2310                 goto out;
2311
2312         nfs4_lock_state();
2313
2314         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2315                                         &oc->oc_req_stateid,
2316                                         CHECK_FH | CONFIRM | OPEN_STATE,
2317                                         &oc->oc_stateowner, &stp, NULL)))
2318                 goto out; 
2319
2320         sop = oc->oc_stateowner;
2321         sop->so_confirmed = 1;
2322         update_stateid(&stp->st_stateid);
2323         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2324         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
2325                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2326                          stp->st_stateid.si_boot,
2327                          stp->st_stateid.si_stateownerid,
2328                          stp->st_stateid.si_fileid,
2329                          stp->st_stateid.si_generation);
2330
2331         nfsd4_create_clid_dir(sop->so_client);
2332 out:
2333         if (oc->oc_stateowner)
2334                 nfs4_get_stateowner(oc->oc_stateowner);
2335         nfs4_unlock_state();
2336         return status;
2337 }
2338
2339
2340 /*
2341  * unset all bits in union bitmap (bmap) that
2342  * do not exist in share (from successful OPEN_DOWNGRADE)
2343  */
2344 static void
2345 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2346 {
2347         int i;
2348         for (i = 1; i < 4; i++) {
2349                 if ((i & access) != i)
2350                         __clear_bit(i, bmap);
2351         }
2352 }
2353
2354 static void
2355 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2356 {
2357         int i;
2358         for (i = 0; i < 4; i++) {
2359                 if ((i & deny) != i)
2360                         __clear_bit(i, bmap);
2361         }
2362 }
2363
2364 int
2365 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2366 {
2367         int status;
2368         struct nfs4_stateid *stp;
2369         unsigned int share_access;
2370
2371         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
2372                         (int)current_fh->fh_dentry->d_name.len,
2373                         current_fh->fh_dentry->d_name.name);
2374
2375         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2376                 return nfserr_inval;
2377
2378         nfs4_lock_state();
2379         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
2380                                         &od->od_stateid, 
2381                                         CHECK_FH | OPEN_STATE, 
2382                                         &od->od_stateowner, &stp, NULL)))
2383                 goto out; 
2384
2385         status = nfserr_inval;
2386         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2387                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2388                         stp->st_access_bmap, od->od_share_access);
2389                 goto out;
2390         }
2391         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2392                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2393                         stp->st_deny_bmap, od->od_share_deny);
2394                 goto out;
2395         }
2396         set_access(&share_access, stp->st_access_bmap);
2397         nfs4_file_downgrade(stp->st_vfs_file,
2398                             share_access & ~od->od_share_access);
2399
2400         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2401         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2402
2403         update_stateid(&stp->st_stateid);
2404         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2405         status = nfs_ok;
2406 out:
2407         if (od->od_stateowner)
2408                 nfs4_get_stateowner(od->od_stateowner);
2409         nfs4_unlock_state();
2410         return status;
2411 }
2412
2413 /*
2414  * nfs4_unlock_state() called after encode
2415  */
2416 int
2417 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2418 {
2419         int status;
2420         struct nfs4_stateid *stp;
2421
2422         dprintk("NFSD: nfsd4_close on file %.*s\n", 
2423                         (int)current_fh->fh_dentry->d_name.len,
2424                         current_fh->fh_dentry->d_name.name);
2425
2426         nfs4_lock_state();
2427         /* check close_lru for replay */
2428         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
2429                                         &close->cl_stateid, 
2430                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2431                                         &close->cl_stateowner, &stp, NULL)))
2432                 goto out; 
2433         /*
2434         *  Return success, but first update the stateid.
2435         */
2436         status = nfs_ok;
2437         update_stateid(&stp->st_stateid);
2438         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2439
2440         /* release_state_owner() calls nfsd_close() if needed */
2441         release_state_owner(stp, OPEN_STATE);
2442 out:
2443         if (close->cl_stateowner)
2444                 nfs4_get_stateowner(close->cl_stateowner);
2445         nfs4_unlock_state();
2446         return status;
2447 }
2448
2449 int
2450 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2451 {
2452         int status;
2453
2454         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2455                 goto out;
2456
2457         nfs4_lock_state();
2458         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2459         nfs4_unlock_state();
2460 out:
2461         return status;
2462 }
2463
2464
2465 /* 
2466  * Lock owner state (byte-range locks)
2467  */
2468 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2469 #define LOCK_HASH_BITS              8
2470 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2471 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2472
2473 #define lockownerid_hashval(id) \
2474         ((id) & LOCK_HASH_MASK)
2475
2476 static inline unsigned int
2477 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2478                 struct xdr_netobj *ownername)
2479 {
2480         return (file_hashval(inode) + cl_id
2481                         + opaque_hashval(ownername->data, ownername->len))
2482                 & LOCK_HASH_MASK;
2483 }
2484
2485 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2486 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2487 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2488
2489 static struct nfs4_stateid *
2490 find_stateid(stateid_t *stid, int flags)
2491 {
2492         struct nfs4_stateid *local = NULL;
2493         u32 st_id = stid->si_stateownerid;
2494         u32 f_id = stid->si_fileid;
2495         unsigned int hashval;
2496
2497         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2498         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2499                 hashval = stateid_hashval(st_id, f_id);
2500                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2501                         if ((local->st_stateid.si_stateownerid == st_id) &&
2502                             (local->st_stateid.si_fileid == f_id))
2503                                 return local;
2504                 }
2505         } 
2506         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2507                 hashval = stateid_hashval(st_id, f_id);
2508                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2509                         if ((local->st_stateid.si_stateownerid == st_id) &&
2510                             (local->st_stateid.si_fileid == f_id))
2511                                 return local;
2512                 }
2513         } else
2514                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2515         return NULL;
2516 }
2517
2518 static struct nfs4_delegation *
2519 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2520 {
2521         struct nfs4_file *fp;
2522         struct nfs4_delegation *dl;
2523
2524         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2525                     stid->si_boot, stid->si_stateownerid,
2526                     stid->si_fileid, stid->si_generation);
2527
2528         fp = find_file(ino);
2529         if (!fp)
2530                 return NULL;
2531         dl = find_delegation_file(fp, stid);
2532         put_nfs4_file(fp);
2533         return dl;
2534 }
2535
2536 /*
2537  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2538  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2539  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2540  * locking, this prevents us from being completely protocol-compliant.  The
2541  * real solution to this problem is to start using unsigned file offsets in
2542  * the VFS, but this is a very deep change!
2543  */
2544 static inline void
2545 nfs4_transform_lock_offset(struct file_lock *lock)
2546 {
2547         if (lock->fl_start < 0)
2548                 lock->fl_start = OFFSET_MAX;
2549         if (lock->fl_end < 0)
2550                 lock->fl_end = OFFSET_MAX;
2551 }
2552
2553 static int
2554 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2555 {
2556         struct nfs4_stateowner *local = NULL;
2557         int status = 0;
2558                                 
2559         if (hashval >= LOCK_HASH_SIZE)
2560                 goto out;
2561         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2562                 if (local == sop) {
2563                         status = 1;
2564                         goto out;
2565                 }
2566         }
2567 out:
2568         return status;
2569 }
2570
2571
2572 static inline void
2573 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2574 {
2575         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2576         unsigned int hval = lockownerid_hashval(sop->so_id);
2577
2578         deny->ld_sop = NULL;
2579         if (nfs4_verify_lock_stateowner(sop, hval)) {
2580                 kref_get(&sop->so_ref);
2581                 deny->ld_sop = sop;
2582                 deny->ld_clientid = sop->so_client->cl_clientid;
2583         }
2584         deny->ld_start = fl->fl_start;
2585         deny->ld_length = ~(u64)0;
2586         if (fl->fl_end != ~(u64)0)
2587                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
2588         deny->ld_type = NFS4_READ_LT;
2589         if (fl->fl_type != F_RDLCK)
2590                 deny->ld_type = NFS4_WRITE_LT;
2591 }
2592
2593 static struct nfs4_stateowner *
2594 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2595                 struct xdr_netobj *owner)
2596 {
2597         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2598         struct nfs4_stateowner *op;
2599
2600         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2601                 if (cmp_owner_str(op, owner, clid))
2602                         return op;
2603         }
2604         return NULL;
2605 }
2606
2607 /*
2608  * Alloc a lock owner structure.
2609  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
2610  * occured. 
2611  *
2612  * strhashval = lock_ownerstr_hashval 
2613  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode 
2614  */
2615
2616 static struct nfs4_stateowner *
2617 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2618         struct nfs4_stateowner *sop;
2619         struct nfs4_replay *rp;
2620         unsigned int idhashval;
2621
2622         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2623                 return NULL;
2624         idhashval = lockownerid_hashval(current_ownerid);
2625         INIT_LIST_HEAD(&sop->so_idhash);
2626         INIT_LIST_HEAD(&sop->so_strhash);
2627         INIT_LIST_HEAD(&sop->so_perclient);
2628         INIT_LIST_HEAD(&sop->so_stateids);
2629         INIT_LIST_HEAD(&sop->so_perstateid);
2630         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2631         sop->so_time = 0;
2632         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2633         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2634         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2635         sop->so_is_open_owner = 0;
2636         sop->so_id = current_ownerid++;
2637         sop->so_client = clp;
2638         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2639         sop->so_confirmed = 1;
2640         rp = &sop->so_replay;
2641         rp->rp_status = NFSERR_SERVERFAULT;
2642         rp->rp_buflen = 0;
2643         rp->rp_buf = rp->rp_ibuf;
2644         return sop;
2645 }
2646
2647 static struct nfs4_stateid *
2648 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2649 {
2650         struct nfs4_stateid *stp;
2651         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2652
2653         stp = nfs4_alloc_stateid();
2654         if (stp == NULL)
2655                 goto out;
2656         INIT_LIST_HEAD(&stp->st_hash);
2657         INIT_LIST_HEAD(&stp->st_perfile);
2658         INIT_LIST_HEAD(&stp->st_perstateowner);
2659         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2660         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2661         list_add(&stp->st_perfile, &fp->fi_stateids);
2662         list_add(&stp->st_perstateowner, &sop->so_stateids);
2663         stp->st_stateowner = sop;
2664         get_nfs4_file(fp);
2665         stp->st_file = fp;
2666         stp->st_stateid.si_boot = boot_time;
2667         stp->st_stateid.si_stateownerid = sop->so_id;
2668         stp->st_stateid.si_fileid = fp->fi_id;
2669         stp->st_stateid.si_generation = 0;
2670         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2671         stp->st_access_bmap = open_stp->st_access_bmap;
2672         stp->st_deny_bmap = open_stp->st_deny_bmap;
2673
2674 out:
2675         return stp;
2676 }
2677
2678 static int
2679 check_lock_length(u64 offset, u64 length)
2680 {
2681         return ((length == 0)  || ((length != ~(u64)0) &&
2682              LOFF_OVERFLOW(offset, length)));
2683 }
2684
2685 /*
2686  *  LOCK operation 
2687  */
2688 int
2689 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2690 {
2691         struct nfs4_stateowner *open_sop = NULL;
2692         struct nfs4_stateid *lock_stp;
2693         struct file *filp;
2694         struct file_lock file_lock;
2695         struct file_lock *conflock;
2696         int status = 0;
2697         unsigned int strhashval;
2698
2699         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2700                 (long long) lock->lk_offset,
2701                 (long long) lock->lk_length);
2702
2703         if (nfs4_in_grace() && !lock->lk_reclaim)
2704                 return nfserr_grace;
2705         if (!nfs4_in_grace() && lock->lk_reclaim)
2706                 return nfserr_no_grace;
2707
2708         if (check_lock_length(lock->lk_offset, lock->lk_length))
2709                  return nfserr_inval;
2710
2711         nfs4_lock_state();
2712
2713         if (lock->lk_is_new) {
2714         /*
2715          * Client indicates that this is a new lockowner.
2716          * Use open owner and open stateid to create lock owner and lock 
2717          * stateid.
2718          */
2719                 struct nfs4_stateid *open_stp = NULL;
2720                 struct nfs4_file *fp;
2721                 
2722                 status = nfserr_stale_clientid;
2723                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2724                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2725                         goto out;
2726                 }
2727
2728                 /* is the new lock seqid presented by the client zero? */
2729                 status = nfserr_bad_seqid;
2730                 if (lock->v.new.lock_seqid != 0)
2731                         goto out;
2732
2733                 /* validate and update open stateid and open seqid */
2734                 status = nfs4_preprocess_seqid_op(current_fh, 
2735                                         lock->lk_new_open_seqid,
2736                                         &lock->lk_new_open_stateid,
2737                                         CHECK_FH | OPEN_STATE,
2738                                         &open_sop, &open_stp,
2739                                         &lock->v.new.clientid);
2740                 if (status) {
2741                         if (lock->lk_reclaim)
2742                                 status = nfserr_reclaim_bad;
2743                         goto out;
2744                 }
2745                 /* create lockowner and lock stateid */
2746                 fp = open_stp->st_file;
2747                 strhashval = lock_ownerstr_hashval(fp->fi_inode, 
2748                                 open_sop->so_client->cl_clientid.cl_id, 
2749                                 &lock->v.new.owner);
2750                 /* XXX: Do we need to check for duplicate stateowners on
2751                  * the same file, or should they just be allowed (and
2752                  * create new stateids)? */
2753                 status = nfserr_resource;
2754                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2755                         goto out;
2756                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 
2757                                                 fp, open_stp)) == NULL) {
2758                         release_stateowner(lock->lk_stateowner);
2759                         lock->lk_stateowner = NULL;
2760                         goto out;
2761                 }
2762                 /* bump the open seqid used to create the lock */
2763                 open_sop->so_seqid++;
2764         } else {
2765                 /* lock (lock owner + lock stateid) already exists */
2766                 status = nfs4_preprocess_seqid_op(current_fh,
2767                                        lock->lk_old_lock_seqid, 
2768                                        &lock->lk_old_lock_stateid, 
2769                                        CHECK_FH | LOCK_STATE, 
2770                                        &lock->lk_stateowner, &lock_stp, NULL);
2771                 if (status)
2772                         goto out;
2773         }
2774         /* lock->lk_stateowner and lock_stp have been created or found */
2775         filp = lock_stp->st_vfs_file;
2776
2777         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2778                 printk("NFSD: nfsd4_lock: permission denied!\n");
2779                 goto out;
2780         }
2781
2782         locks_init_lock(&file_lock);
2783         switch (lock->lk_type) {
2784                 case NFS4_READ_LT:
2785                 case NFS4_READW_LT:
2786                         file_lock.fl_type = F_RDLCK;
2787                 break;
2788                 case NFS4_WRITE_LT:
2789                 case NFS4_WRITEW_LT:
2790                         file_lock.fl_type = F_WRLCK;
2791                 break;
2792                 default:
2793                         status = nfserr_inval;
2794                 goto out;
2795         }
2796         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2797         file_lock.fl_pid = current->tgid;
2798         file_lock.fl_file = filp;
2799         file_lock.fl_flags = FL_POSIX;
2800
2801         file_lock.fl_start = lock->lk_offset;
2802         if ((lock->lk_length == ~(u64)0) || 
2803                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2804                 file_lock.fl_end = ~(u64)0;
2805         else
2806                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2807         nfs4_transform_lock_offset(&file_lock);
2808
2809         /*
2810         * Try to lock the file in the VFS.
2811         * Note: locks.c uses the BKL to protect the inode's lock list.
2812         */
2813
2814         status = posix_lock_file(filp, &file_lock);
2815         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2816                 file_lock.fl_ops->fl_release_private(&file_lock);
2817         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2818         switch (-status) {
2819         case 0: /* success! */
2820                 update_stateid(&lock_stp->st_stateid);
2821                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
2822                                 sizeof(stateid_t));
2823                 goto out;
2824         case (EAGAIN):
2825                 goto conflicting_lock;
2826         case (EDEADLK):
2827                 status = nfserr_deadlock;
2828         default:        
2829                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2830                 goto out_destroy_new_stateid;
2831         }
2832
2833 conflicting_lock:
2834         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2835         status = nfserr_denied;
2836         /* XXX There is a race here. Future patch needed to provide 
2837          * an atomic posix_lock_and_test_file
2838          */
2839         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2840                 status = nfserr_serverfault;
2841                 goto out;
2842         }
2843         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2844
2845 out_destroy_new_stateid:
2846         if (lock->lk_is_new) {
2847                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2848         /*
2849         * An error encountered after instantiation of the new
2850         * stateid has forced us to destroy it.
2851         */
2852                 if (!seqid_mutating_err(status))
2853                         open_sop->so_seqid--;
2854
2855                 release_state_owner(lock_stp, LOCK_STATE);
2856         }
2857 out:
2858         if (lock->lk_stateowner)
2859                 nfs4_get_stateowner(lock->lk_stateowner);
2860         nfs4_unlock_state();
2861         return status;
2862 }
2863
2864 /*
2865  * LOCKT operation
2866  */
2867 int
2868 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2869 {
2870         struct inode *inode;
2871         struct file file;
2872         struct file_lock file_lock;
2873         struct file_lock *conflicting_lock;
2874         int status;
2875
2876         if (nfs4_in_grace())
2877                 return nfserr_grace;
2878
2879         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2880                  return nfserr_inval;
2881
2882         lockt->lt_stateowner = NULL;
2883         nfs4_lock_state();
2884
2885         status = nfserr_stale_clientid;
2886         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2887                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2888                 goto out;
2889         }
2890
2891         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2892                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2893                 if (status == nfserr_symlink)
2894                         status = nfserr_inval;
2895                 goto out;
2896         }
2897
2898         inode = current_fh->fh_dentry->d_inode;
2899         locks_init_lock(&file_lock);
2900         switch (lockt->lt_type) {
2901                 case NFS4_READ_LT:
2902                 case NFS4_READW_LT:
2903                         file_lock.fl_type = F_RDLCK;
2904                 break;
2905                 case NFS4_WRITE_LT:
2906                 case NFS4_WRITEW_LT:
2907                         file_lock.fl_type = F_WRLCK;
2908                 break;
2909                 default:
2910                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2911                         status = nfserr_inval;
2912                 goto out;
2913         }
2914
2915         lockt->lt_stateowner = find_lockstateowner_str(inode,
2916                         &lockt->lt_clientid, &lockt->lt_owner);
2917         if (lockt->lt_stateowner)
2918                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2919         file_lock.fl_pid = current->tgid;
2920         file_lock.fl_flags = FL_POSIX;
2921
2922         file_lock.fl_start = lockt->lt_offset;
2923         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2924                 file_lock.fl_end = ~(u64)0;
2925         else
2926                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2927
2928         nfs4_transform_lock_offset(&file_lock);
2929
2930         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2931          * since LOCKT doesn't require an OPEN, and therefore a struct
2932          * file may not exist, pass posix_test_lock a struct file with
2933          * only the dentry:inode set.
2934          */
2935         memset(&file, 0, sizeof (struct file));
2936         file.f_dentry = current_fh->fh_dentry;
2937
2938         status = nfs_ok;
2939         conflicting_lock = posix_test_lock(&file, &file_lock);
2940         if (conflicting_lock) {
2941                 status = nfserr_denied;
2942                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2943         }
2944 out:
2945         nfs4_unlock_state();
2946         return status;
2947 }
2948
2949 int
2950 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2951 {
2952         struct nfs4_stateid *stp;
2953         struct file *filp = NULL;
2954         struct file_lock file_lock;
2955         int status;
2956                                                         
2957         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2958                 (long long) locku->lu_offset,
2959                 (long long) locku->lu_length);
2960
2961         if (check_lock_length(locku->lu_offset, locku->lu_length))
2962                  return nfserr_inval;
2963
2964         nfs4_lock_state();
2965                                                                                 
2966         if ((status = nfs4_preprocess_seqid_op(current_fh, 
2967                                         locku->lu_seqid, 
2968                                         &locku->lu_stateid, 
2969                                         CHECK_FH | LOCK_STATE, 
2970                                         &locku->lu_stateowner, &stp, NULL)))
2971                 goto out;
2972
2973         filp = stp->st_vfs_file;
2974         BUG_ON(!filp);
2975         locks_init_lock(&file_lock);
2976         file_lock.fl_type = F_UNLCK;
2977         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2978         file_lock.fl_pid = current->tgid;
2979         file_lock.fl_file = filp;
2980         file_lock.fl_flags = FL_POSIX; 
2981         file_lock.fl_start = locku->lu_offset;
2982
2983         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2984                 file_lock.fl_end = ~(u64)0;
2985         else
2986                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2987         nfs4_transform_lock_offset(&file_lock);
2988
2989         /*
2990         *  Try to unlock the file in the VFS.
2991         */
2992         status = posix_lock_file(filp, &file_lock); 
2993         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2994                 file_lock.fl_ops->fl_release_private(&file_lock);
2995         if (status) {
2996                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2997                 goto out_nfserr;
2998         }
2999         /*
3000         * OK, unlock succeeded; the only thing left to do is update the stateid.
3001         */
3002         update_stateid(&stp->st_stateid);
3003         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3004
3005 out:
3006         if (locku->lu_stateowner)
3007                 nfs4_get_stateowner(locku->lu_stateowner);
3008         nfs4_unlock_state();
3009         return status;
3010
3011 out_nfserr:
3012         status = nfserrno(status);
3013         goto out;
3014 }
3015
3016 /*
3017  * returns
3018  *      1: locks held by lockowner
3019  *      0: no locks held by lockowner
3020  */
3021 static int
3022 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3023 {
3024         struct file_lock **flpp;
3025         struct inode *inode = filp->f_dentry->d_inode;
3026         int status = 0;
3027
3028         lock_kernel();
3029         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3030                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3031                         status = 1;
3032                         goto out;
3033         }
3034 out:
3035         unlock_kernel();
3036         return status;
3037 }
3038
3039 int
3040 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3041 {
3042         clientid_t *clid = &rlockowner->rl_clientid;
3043         struct nfs4_stateowner *sop;
3044         struct nfs4_stateid *stp;
3045         struct xdr_netobj *owner = &rlockowner->rl_owner;
3046         struct list_head matches;
3047         int i;
3048         int status;
3049
3050         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3051                 clid->cl_boot, clid->cl_id);
3052
3053         /* XXX check for lease expiration */
3054
3055         status = nfserr_stale_clientid;
3056         if (STALE_CLIENTID(clid)) {
3057                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3058                 return status;
3059         }
3060
3061         nfs4_lock_state();
3062
3063         status = nfserr_locks_held;
3064         /* XXX: we're doing a linear search through all the lockowners.
3065          * Yipes!  For now we'll just hope clients aren't really using
3066          * release_lockowner much, but eventually we have to fix these
3067          * data structures. */
3068         INIT_LIST_HEAD(&matches);
3069         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3070                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3071                         if (!cmp_owner_str(sop, owner, clid))
3072                                 continue;
3073                         list_for_each_entry(stp, &sop->so_stateids,
3074                                         st_perstateowner) {
3075                                 if (check_for_locks(stp->st_vfs_file, sop))
3076                                         goto out;
3077                                 /* Note: so_perclient unused for lockowners,
3078                                  * so it's OK to fool with here. */
3079                                 list_add(&sop->so_perclient, &matches);
3080                         }
3081                 }
3082         }
3083         /* Clients probably won't expect us to return with some (but not all)
3084          * of the lockowner state released; so don't release any until all
3085          * have been checked. */
3086         status = nfs_ok;
3087         list_for_each_entry(sop, &matches, so_perclient) {
3088                 release_stateowner(sop);
3089         }
3090 out:
3091         nfs4_unlock_state();
3092         return status;
3093 }
3094
3095 static inline struct nfs4_client_reclaim *
3096 alloc_reclaim(void)
3097 {
3098         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3099 }
3100
3101 int
3102 nfs4_has_reclaimed_state(const char *name)
3103 {
3104         unsigned int strhashval = clientstr_hashval(name);
3105         struct nfs4_client *clp;
3106
3107         clp = find_confirmed_client_by_str(name, strhashval);
3108         return clp ? 1 : 0;
3109 }
3110
3111 /*
3112  * failure => all reset bets are off, nfserr_no_grace...
3113  */
3114 int
3115 nfs4_client_to_reclaim(const char *name)
3116 {
3117         unsigned int strhashval;
3118         struct nfs4_client_reclaim *crp = NULL;
3119
3120         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3121         crp = alloc_reclaim();
3122         if (!crp)
3123                 return 0;
3124         strhashval = clientstr_hashval(name);
3125         INIT_LIST_HEAD(&crp->cr_strhash);
3126         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3127         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3128         reclaim_str_hashtbl_size++;
3129         return 1;
3130 }
3131
3132 static void
3133 nfs4_release_reclaim(void)
3134 {
3135         struct nfs4_client_reclaim *crp = NULL;
3136         int i;
3137
3138         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3139                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3140                         crp = list_entry(reclaim_str_hashtbl[i].next,
3141                                         struct nfs4_client_reclaim, cr_strhash);
3142                         list_del(&crp->cr_strhash);
3143                         kfree(crp);
3144                         reclaim_str_hashtbl_size--;
3145                 }
3146         }
3147         BUG_ON(reclaim_str_hashtbl_size);
3148 }
3149
3150 /*
3151  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3152 static struct nfs4_client_reclaim *
3153 nfs4_find_reclaim_client(clientid_t *clid)
3154 {
3155         unsigned int strhashval;
3156         struct nfs4_client *clp;
3157         struct nfs4_client_reclaim *crp = NULL;
3158
3159
3160         /* find clientid in conf_id_hashtbl */
3161         clp = find_confirmed_client(clid);
3162         if (clp == NULL)
3163                 return NULL;
3164
3165         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3166                             clp->cl_name.len, clp->cl_name.data,
3167                             clp->cl_recdir);
3168
3169         /* find clp->cl_name in reclaim_str_hashtbl */
3170         strhashval = clientstr_hashval(clp->cl_recdir);
3171         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3172                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3173                         return crp;
3174                 }
3175         }
3176         return NULL;
3177 }
3178
3179 /*
3180 * Called from OPEN. Look for clientid in reclaim list.
3181 */
3182 int
3183 nfs4_check_open_reclaim(clientid_t *clid)
3184 {
3185         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3186 }
3187
3188 /* initialization to perform at module load time: */
3189
3190 void
3191 nfs4_state_init(void)
3192 {
3193         int i;
3194
3195         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3196                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3197                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3198                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3199                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3200         }
3201         for (i = 0; i < FILE_HASH_SIZE; i++) {
3202                 INIT_LIST_HEAD(&file_hashtbl[i]);
3203         }
3204         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3205                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3206                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3207         }
3208         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3209                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3210                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3211         }
3212         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3213                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3214                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3215         }
3216         memset(&onestateid, ~0, sizeof(stateid_t));
3217         INIT_LIST_HEAD(&close_lru);
3218         INIT_LIST_HEAD(&client_lru);
3219         INIT_LIST_HEAD(&del_recall_lru);
3220         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3221                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3222         reclaim_str_hashtbl_size = 0;
3223 }
3224
3225 static void
3226 nfsd4_load_reboot_recovery_data(void)
3227 {
3228         int status;
3229
3230         nfs4_lock_state();
3231         nfsd4_init_recdir(user_recovery_dirname);
3232         status = nfsd4_recdir_load();
3233         nfs4_unlock_state();
3234         if (status)
3235                 printk("NFSD: Failure reading reboot recovery data\n");
3236 }
3237
3238 /* initialization to perform when the nfsd service is started: */
3239
3240 static void
3241 __nfs4_state_start(void)
3242 {
3243         time_t grace_time;
3244
3245         boot_time = get_seconds();
3246         grace_time = max(user_lease_time, lease_time);
3247         lease_time = user_lease_time;
3248         in_grace = 1;
3249         printk("NFSD: starting %ld-second grace period\n", grace_time);
3250         laundry_wq = create_singlethread_workqueue("nfsd4");
3251         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3252 }
3253
3254 int
3255 nfs4_state_start(void)
3256 {
3257         int status;
3258
3259         if (nfs4_init)
3260                 return 0;
3261         status = nfsd4_init_slabs();
3262         if (status)
3263                 return status;
3264         nfsd4_load_reboot_recovery_data();
3265         __nfs4_state_start();
3266         nfs4_init = 1;
3267         return 0;
3268 }
3269
3270 int
3271 nfs4_in_grace(void)
3272 {
3273         return in_grace;
3274 }
3275
3276 time_t
3277 nfs4_lease_time(void)
3278 {
3279         return lease_time;
3280 }
3281
3282 static void
3283 __nfs4_state_shutdown(void)
3284 {
3285         int i;
3286         struct nfs4_client *clp = NULL;
3287         struct nfs4_delegation *dp = NULL;
3288         struct nfs4_stateowner *sop = NULL;
3289         struct list_head *pos, *next, reaplist;
3290
3291         list_for_each_safe(pos, next, &close_lru) {
3292                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3293                 list_del(&sop->so_close_lru);
3294                 nfs4_put_stateowner(sop);
3295         }
3296
3297         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3298                 while (!list_empty(&conf_id_hashtbl[i])) {
3299                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3300                         expire_client(clp);
3301                 }
3302                 while (!list_empty(&unconf_str_hashtbl[i])) {
3303                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3304                         expire_client(clp);
3305                 }
3306         }
3307         INIT_LIST_HEAD(&reaplist);
3308         spin_lock(&recall_lock);
3309         list_for_each_safe(pos, next, &del_recall_lru) {
3310                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3311                 list_move(&dp->dl_recall_lru, &reaplist);
3312         }
3313         spin_unlock(&recall_lock);
3314         list_for_each_safe(pos, next, &reaplist) {
3315                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3316                 list_del_init(&dp->dl_recall_lru);
3317                 unhash_delegation(dp);
3318         }
3319
3320         cancel_delayed_work(&laundromat_work);
3321         flush_workqueue(laundry_wq);
3322         destroy_workqueue(laundry_wq);
3323         nfsd4_shutdown_recdir();
3324         nfs4_init = 0;
3325 }
3326
3327 void
3328 nfs4_state_shutdown(void)
3329 {
3330         nfs4_lock_state();
3331         nfs4_release_reclaim();
3332         __nfs4_state_shutdown();
3333         nfsd4_free_slabs();
3334         nfs4_unlock_state();
3335 }
3336
3337 static void
3338 nfs4_set_recdir(char *recdir)
3339 {
3340         nfs4_lock_state();
3341         strcpy(user_recovery_dirname, recdir);
3342         nfs4_unlock_state();
3343 }
3344
3345 /*
3346  * Change the NFSv4 recovery directory to recdir.
3347  */
3348 int
3349 nfs4_reset_recoverydir(char *recdir)
3350 {
3351         int status;
3352         struct nameidata nd;
3353
3354         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3355         if (status)
3356                 return status;
3357         status = -ENOTDIR;
3358         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3359                 nfs4_set_recdir(recdir);
3360                 status = 0;
3361         }
3362         path_release(&nd);
3363         return status;
3364 }
3365
3366 /*
3367  * Called when leasetime is changed.
3368  *
3369  * The only way the protocol gives us to handle on-the-fly lease changes is to
3370  * simulate a reboot.  Instead of doing that, we just wait till the next time
3371  * we start to register any changes in lease time.  If the administrator
3372  * really wants to change the lease time *now*, they can go ahead and bring
3373  * nfsd down and then back up again after changing the lease time.
3374  */
3375 void
3376 nfs4_reset_lease(time_t leasetime)
3377 {
3378         lock_kernel();
3379         user_lease_time = leasetime;
3380         unlock_kernel();
3381 }