[PATCH] sem2mutex: fs/
[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 #include <linux/mutex.h>
53
54 #define NFSDDBG_FACILITY                NFSDDBG_PROC
55
56 /* Globals */
57 static time_t lease_time = 90;     /* default lease time */
58 static time_t user_lease_time = 90;
59 static time_t boot_time;
60 static int in_grace = 1;
61 static u32 current_clientid = 1;
62 static u32 current_ownerid = 1;
63 static u32 current_fileid = 1;
64 static u32 current_delegid = 1;
65 static u32 nfs4_init;
66 static stateid_t zerostateid;             /* bits all 0 */
67 static stateid_t onestateid;              /* bits all 1 */
68
69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
70 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
71
72 /* forward declarations */
73 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
74 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
75 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
76 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
77 static void nfs4_set_recdir(char *recdir);
78
79 /* Locking:
80  *
81  * client_mutex:
82  *      protects clientid_hashtbl[], clientstr_hashtbl[],
83  *      unconfstr_hashtbl[], uncofid_hashtbl[].
84  */
85 static DEFINE_MUTEX(client_mutex);
86
87 static kmem_cache_t *stateowner_slab = NULL;
88 static kmem_cache_t *file_slab = NULL;
89 static kmem_cache_t *stateid_slab = NULL;
90 static kmem_cache_t *deleg_slab = NULL;
91
92 void
93 nfs4_lock_state(void)
94 {
95         mutex_lock(&client_mutex);
96 }
97
98 void
99 nfs4_unlock_state(void)
100 {
101         mutex_unlock(&client_mutex);
102 }
103
104 static inline u32
105 opaque_hashval(const void *ptr, int nbytes)
106 {
107         unsigned char *cptr = (unsigned char *) ptr;
108
109         u32 x = 0;
110         while (nbytes--) {
111                 x *= 37;
112                 x += *cptr++;
113         }
114         return x;
115 }
116
117 /* forward declarations */
118 static void release_stateowner(struct nfs4_stateowner *sop);
119 static void release_stateid(struct nfs4_stateid *stp, int flags);
120
121 /*
122  * Delegation state
123  */
124
125 /* recall_lock protects the del_recall_lru */
126 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
127 static struct list_head del_recall_lru;
128
129 static void
130 free_nfs4_file(struct kref *kref)
131 {
132         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
133         list_del(&fp->fi_hash);
134         iput(fp->fi_inode);
135         kmem_cache_free(file_slab, fp);
136 }
137
138 static inline void
139 put_nfs4_file(struct nfs4_file *fi)
140 {
141         kref_put(&fi->fi_ref, free_nfs4_file);
142 }
143
144 static inline void
145 get_nfs4_file(struct nfs4_file *fi)
146 {
147         kref_get(&fi->fi_ref);
148 }
149
150 static struct nfs4_delegation *
151 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
152 {
153         struct nfs4_delegation *dp;
154         struct nfs4_file *fp = stp->st_file;
155         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
156
157         dprintk("NFSD alloc_init_deleg\n");
158         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
159         if (dp == NULL)
160                 return dp;
161         INIT_LIST_HEAD(&dp->dl_perfile);
162         INIT_LIST_HEAD(&dp->dl_perclnt);
163         INIT_LIST_HEAD(&dp->dl_recall_lru);
164         dp->dl_client = clp;
165         get_nfs4_file(fp);
166         dp->dl_file = fp;
167         dp->dl_flock = NULL;
168         get_file(stp->st_vfs_file);
169         dp->dl_vfs_file = stp->st_vfs_file;
170         dp->dl_type = type;
171         dp->dl_recall.cbr_dp = NULL;
172         dp->dl_recall.cbr_ident = cb->cb_ident;
173         dp->dl_recall.cbr_trunc = 0;
174         dp->dl_stateid.si_boot = boot_time;
175         dp->dl_stateid.si_stateownerid = current_delegid++;
176         dp->dl_stateid.si_fileid = 0;
177         dp->dl_stateid.si_generation = 0;
178         dp->dl_fhlen = current_fh->fh_handle.fh_size;
179         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
180                         current_fh->fh_handle.fh_size);
181         dp->dl_time = 0;
182         atomic_set(&dp->dl_count, 1);
183         list_add(&dp->dl_perfile, &fp->fi_delegations);
184         list_add(&dp->dl_perclnt, &clp->cl_delegations);
185         return dp;
186 }
187
188 void
189 nfs4_put_delegation(struct nfs4_delegation *dp)
190 {
191         if (atomic_dec_and_test(&dp->dl_count)) {
192                 dprintk("NFSD: freeing dp %p\n",dp);
193                 put_nfs4_file(dp->dl_file);
194                 kmem_cache_free(deleg_slab, dp);
195         }
196 }
197
198 /* Remove the associated file_lock first, then remove the delegation.
199  * lease_modify() is called to remove the FS_LEASE file_lock from
200  * the i_flock list, eventually calling nfsd's lock_manager
201  * fl_release_callback.
202  */
203 static void
204 nfs4_close_delegation(struct nfs4_delegation *dp)
205 {
206         struct file *filp = dp->dl_vfs_file;
207
208         dprintk("NFSD: close_delegation dp %p\n",dp);
209         dp->dl_vfs_file = NULL;
210         /* The following nfsd_close may not actually close the file,
211          * but we want to remove the lease in any case. */
212         if (dp->dl_flock)
213                 setlease(filp, F_UNLCK, &dp->dl_flock);
214         nfsd_close(filp);
215 }
216
217 /* Called under the state lock. */
218 static void
219 unhash_delegation(struct nfs4_delegation *dp)
220 {
221         list_del_init(&dp->dl_perfile);
222         list_del_init(&dp->dl_perclnt);
223         spin_lock(&recall_lock);
224         list_del_init(&dp->dl_recall_lru);
225         spin_unlock(&recall_lock);
226         nfs4_close_delegation(dp);
227         nfs4_put_delegation(dp);
228 }
229
230 /* 
231  * SETCLIENTID state 
232  */
233
234 /* Hash tables for nfs4_clientid state */
235 #define CLIENT_HASH_BITS                 4
236 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
237 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
238
239 #define clientid_hashval(id) \
240         ((id) & CLIENT_HASH_MASK)
241 #define clientstr_hashval(name) \
242         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
243 /*
244  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
245  * used in reboot/reset lease grace period processing
246  *
247  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
248  * setclientid_confirmed info. 
249  *
250  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
251  * setclientid info.
252  *
253  * client_lru holds client queue ordered by nfs4_client.cl_time
254  * for lease renewal.
255  *
256  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
257  * for last close replay.
258  */
259 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
260 static int reclaim_str_hashtbl_size = 0;
261 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
262 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
263 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
264 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
265 static struct list_head client_lru;
266 static struct list_head close_lru;
267
268 static inline void
269 renew_client(struct nfs4_client *clp)
270 {
271         /*
272         * Move client to the end to the LRU list.
273         */
274         dprintk("renewing client (clientid %08x/%08x)\n", 
275                         clp->cl_clientid.cl_boot, 
276                         clp->cl_clientid.cl_id);
277         list_move_tail(&clp->cl_lru, &client_lru);
278         clp->cl_time = get_seconds();
279 }
280
281 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
282 static int
283 STALE_CLIENTID(clientid_t *clid)
284 {
285         if (clid->cl_boot == boot_time)
286                 return 0;
287         dprintk("NFSD stale clientid (%08x/%08x)\n", 
288                         clid->cl_boot, clid->cl_id);
289         return 1;
290 }
291
292 /* 
293  * XXX Should we use a slab cache ?
294  * This type of memory management is somewhat inefficient, but we use it
295  * anyway since SETCLIENTID is not a common operation.
296  */
297 static inline struct nfs4_client *
298 alloc_client(struct xdr_netobj name)
299 {
300         struct nfs4_client *clp;
301
302         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
303                 memset(clp, 0, sizeof(*clp));
304                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
305                         memcpy(clp->cl_name.data, name.data, name.len);
306                         clp->cl_name.len = name.len;
307                 }
308                 else {
309                         kfree(clp);
310                         clp = NULL;
311                 }
312         }
313         return clp;
314 }
315
316 static inline void
317 free_client(struct nfs4_client *clp)
318 {
319         if (clp->cl_cred.cr_group_info)
320                 put_group_info(clp->cl_cred.cr_group_info);
321         kfree(clp->cl_name.data);
322         kfree(clp);
323 }
324
325 void
326 put_nfs4_client(struct nfs4_client *clp)
327 {
328         if (atomic_dec_and_test(&clp->cl_count))
329                 free_client(clp);
330 }
331
332 static void
333 expire_client(struct nfs4_client *clp)
334 {
335         struct nfs4_stateowner *sop;
336         struct nfs4_delegation *dp;
337         struct nfs4_callback *cb = &clp->cl_callback;
338         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
339         struct list_head reaplist;
340
341         dprintk("NFSD: expire_client cl_count %d\n",
342                             atomic_read(&clp->cl_count));
343
344         /* shutdown rpc client, ending any outstanding recall rpcs */
345         if (atomic_read(&cb->cb_set) == 1 && clnt) {
346                 rpc_shutdown_client(clnt);
347                 clnt = clp->cl_callback.cb_client = NULL;
348         }
349
350         INIT_LIST_HEAD(&reaplist);
351         spin_lock(&recall_lock);
352         while (!list_empty(&clp->cl_delegations)) {
353                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
354                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
355                                 dp->dl_flock);
356                 list_del_init(&dp->dl_perclnt);
357                 list_move(&dp->dl_recall_lru, &reaplist);
358         }
359         spin_unlock(&recall_lock);
360         while (!list_empty(&reaplist)) {
361                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
362                 list_del_init(&dp->dl_recall_lru);
363                 unhash_delegation(dp);
364         }
365         list_del(&clp->cl_idhash);
366         list_del(&clp->cl_strhash);
367         list_del(&clp->cl_lru);
368         while (!list_empty(&clp->cl_openowners)) {
369                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
370                 release_stateowner(sop);
371         }
372         put_nfs4_client(clp);
373 }
374
375 static struct nfs4_client *
376 create_client(struct xdr_netobj name, char *recdir) {
377         struct nfs4_client *clp;
378
379         if (!(clp = alloc_client(name)))
380                 goto out;
381         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
382         atomic_set(&clp->cl_count, 1);
383         atomic_set(&clp->cl_callback.cb_set, 0);
384         INIT_LIST_HEAD(&clp->cl_idhash);
385         INIT_LIST_HEAD(&clp->cl_strhash);
386         INIT_LIST_HEAD(&clp->cl_openowners);
387         INIT_LIST_HEAD(&clp->cl_delegations);
388         INIT_LIST_HEAD(&clp->cl_lru);
389 out:
390         return clp;
391 }
392
393 static void
394 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
395         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
396 }
397
398 static void
399 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
400         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
401         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
402 }
403
404 static void
405 copy_cred(struct svc_cred *target, struct svc_cred *source) {
406
407         target->cr_uid = source->cr_uid;
408         target->cr_gid = source->cr_gid;
409         target->cr_group_info = source->cr_group_info;
410         get_group_info(target->cr_group_info);
411 }
412
413 static inline int
414 same_name(const char *n1, const char *n2) {
415         return 0 == memcmp(n1, n2, HEXDIR_LEN);
416 }
417
418 static int
419 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
420         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
421 }
422
423 static int
424 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
425         return((cl1->cl_boot == cl2->cl_boot) &&
426                 (cl1->cl_id == cl2->cl_id));
427 }
428
429 /* XXX what about NGROUP */
430 static int
431 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
432         return(cr1->cr_uid == cr2->cr_uid);
433
434 }
435
436 static void
437 gen_clid(struct nfs4_client *clp) {
438         clp->cl_clientid.cl_boot = boot_time;
439         clp->cl_clientid.cl_id = current_clientid++; 
440 }
441
442 static void
443 gen_confirm(struct nfs4_client *clp) {
444         struct timespec         tv;
445         u32 *                   p;
446
447         tv = CURRENT_TIME;
448         p = (u32 *)clp->cl_confirm.data;
449         *p++ = tv.tv_sec;
450         *p++ = tv.tv_nsec;
451 }
452
453 static int
454 check_name(struct xdr_netobj name) {
455
456         if (name.len == 0) 
457                 return 0;
458         if (name.len > NFS4_OPAQUE_LIMIT) {
459                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
460                 return 0;
461         }
462         return 1;
463 }
464
465 static void
466 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
467 {
468         unsigned int idhashval;
469
470         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
471         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
472         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
473         list_add_tail(&clp->cl_lru, &client_lru);
474         clp->cl_time = get_seconds();
475 }
476
477 static void
478 move_to_confirmed(struct nfs4_client *clp)
479 {
480         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
481         unsigned int strhashval;
482
483         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
484         list_del_init(&clp->cl_strhash);
485         list_del_init(&clp->cl_idhash);
486         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
487         strhashval = clientstr_hashval(clp->cl_recdir);
488         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
489         renew_client(clp);
490 }
491
492 static struct nfs4_client *
493 find_confirmed_client(clientid_t *clid)
494 {
495         struct nfs4_client *clp;
496         unsigned int idhashval = clientid_hashval(clid->cl_id);
497
498         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
499                 if (cmp_clid(&clp->cl_clientid, clid))
500                         return clp;
501         }
502         return NULL;
503 }
504
505 static struct nfs4_client *
506 find_unconfirmed_client(clientid_t *clid)
507 {
508         struct nfs4_client *clp;
509         unsigned int idhashval = clientid_hashval(clid->cl_id);
510
511         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
512                 if (cmp_clid(&clp->cl_clientid, clid))
513                         return clp;
514         }
515         return NULL;
516 }
517
518 static struct nfs4_client *
519 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
520 {
521         struct nfs4_client *clp;
522
523         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
524                 if (same_name(clp->cl_recdir, dname))
525                         return clp;
526         }
527         return NULL;
528 }
529
530 static struct nfs4_client *
531 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
532 {
533         struct nfs4_client *clp;
534
535         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
536                 if (same_name(clp->cl_recdir, dname))
537                         return clp;
538         }
539         return NULL;
540 }
541
542 /* a helper function for parse_callback */
543 static int
544 parse_octet(unsigned int *lenp, char **addrp)
545 {
546         unsigned int len = *lenp;
547         char *p = *addrp;
548         int n = -1;
549         char c;
550
551         for (;;) {
552                 if (!len)
553                         break;
554                 len--;
555                 c = *p++;
556                 if (c == '.')
557                         break;
558                 if ((c < '0') || (c > '9')) {
559                         n = -1;
560                         break;
561                 }
562                 if (n < 0)
563                         n = 0;
564                 n = (n * 10) + (c - '0');
565                 if (n > 255) {
566                         n = -1;
567                         break;
568                 }
569         }
570         *lenp = len;
571         *addrp = p;
572         return n;
573 }
574
575 /* parse and set the setclientid ipv4 callback address */
576 static int
577 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
578 {
579         int temp = 0;
580         u32 cbaddr = 0;
581         u16 cbport = 0;
582         u32 addrlen = addr_len;
583         char *addr = addr_val;
584         int i, shift;
585
586         /* ipaddress */
587         shift = 24;
588         for(i = 4; i > 0  ; i--) {
589                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
590                         return 0;
591                 }
592                 cbaddr |= (temp << shift);
593                 if (shift > 0)
594                 shift -= 8;
595         }
596         *cbaddrp = cbaddr;
597
598         /* port */
599         shift = 8;
600         for(i = 2; i > 0  ; i--) {
601                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
602                         return 0;
603                 }
604                 cbport |= (temp << shift);
605                 if (shift > 0)
606                         shift -= 8;
607         }
608         *cbportp = cbport;
609         return 1;
610 }
611
612 static void
613 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
614 {
615         struct nfs4_callback *cb = &clp->cl_callback;
616
617         /* Currently, we only support tcp for the callback channel */
618         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
619                 goto out_err;
620
621         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
622                          &cb->cb_addr, &cb->cb_port)))
623                 goto out_err;
624         cb->cb_prog = se->se_callback_prog;
625         cb->cb_ident = se->se_callback_ident;
626         return;
627 out_err:
628         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
629                 "will not receive delegations\n",
630                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
631
632         return;
633 }
634
635 /*
636  * RFC 3010 has a complex implmentation description of processing a 
637  * SETCLIENTID request consisting of 5 bullets, labeled as 
638  * CASE0 - CASE4 below.
639  *
640  * NOTES:
641  *      callback information will be processed in a future patch
642  *
643  *      an unconfirmed record is added when:
644  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
645  *      CASE 1: confirmed record found with matching name, principal,
646  *              verifier, and clientid.
647  *      CASE 2: confirmed record found with matching name, principal,
648  *              and there is no unconfirmed record with matching
649  *              name and principal
650  *
651  *      an unconfirmed record is replaced when:
652  *      CASE 3: confirmed record found with matching name, principal,
653  *              and an unconfirmed record is found with matching 
654  *              name, principal, and with clientid and
655  *              confirm that does not match the confirmed record.
656  *      CASE 4: there is no confirmed record with matching name and 
657  *              principal. there is an unconfirmed record with 
658  *              matching name, principal.
659  *
660  *      an unconfirmed record is deleted when:
661  *      CASE 1: an unconfirmed record that matches input name, verifier,
662  *              and confirmed clientid.
663  *      CASE 4: any unconfirmed records with matching name and principal
664  *              that exist after an unconfirmed record has been replaced
665  *              as described above.
666  *
667  */
668 int
669 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
670 {
671         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
672         struct xdr_netobj       clname = { 
673                 .len = setclid->se_namelen,
674                 .data = setclid->se_name,
675         };
676         nfs4_verifier           clverifier = setclid->se_verf;
677         unsigned int            strhashval;
678         struct nfs4_client      *conf, *unconf, *new;
679         int                     status;
680         char                    dname[HEXDIR_LEN];
681         
682         if (!check_name(clname))
683                 return nfserr_inval;
684
685         status = nfs4_make_rec_clidname(dname, &clname);
686         if (status)
687                 return status;
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         stp->st_openstp = NULL;
1164 }
1165
1166 static void
1167 release_stateid(struct nfs4_stateid *stp, int flags)
1168 {
1169         struct file *filp = stp->st_vfs_file;
1170
1171         list_del(&stp->st_hash);
1172         list_del(&stp->st_perfile);
1173         list_del(&stp->st_perstateowner);
1174         if (flags & OPEN_STATE) {
1175                 release_stateid_lockowners(stp);
1176                 stp->st_vfs_file = NULL;
1177                 nfsd_close(filp);
1178         } else if (flags & LOCK_STATE)
1179                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1180         put_nfs4_file(stp->st_file);
1181         kmem_cache_free(stateid_slab, stp);
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 int
1195 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1196         return ((sop->so_owner.len == owner->len) && 
1197          !memcmp(sop->so_owner.data, owner->data, owner->len) && 
1198           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1199 }
1200
1201 static struct nfs4_stateowner *
1202 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1203 {
1204         struct nfs4_stateowner *so = NULL;
1205
1206         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1207                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1208                         return so;
1209         }
1210         return NULL;
1211 }
1212
1213 /* search file_hashtbl[] for file */
1214 static struct nfs4_file *
1215 find_file(struct inode *ino)
1216 {
1217         unsigned int hashval = file_hashval(ino);
1218         struct nfs4_file *fp;
1219
1220         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1221                 if (fp->fi_inode == ino) {
1222                         get_nfs4_file(fp);
1223                         return fp;
1224                 }
1225         }
1226         return NULL;
1227 }
1228
1229 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1230 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1231
1232 static void
1233 set_access(unsigned int *access, unsigned long bmap) {
1234         int i;
1235
1236         *access = 0;
1237         for (i = 1; i < 4; i++) {
1238                 if (test_bit(i, &bmap))
1239                         *access |= i;
1240         }
1241 }
1242
1243 static void
1244 set_deny(unsigned int *deny, unsigned long bmap) {
1245         int i;
1246
1247         *deny = 0;
1248         for (i = 0; i < 4; i++) {
1249                 if (test_bit(i, &bmap))
1250                         *deny |= i ;
1251         }
1252 }
1253
1254 static int
1255 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1256         unsigned int access, deny;
1257
1258         set_access(&access, stp->st_access_bmap);
1259         set_deny(&deny, stp->st_deny_bmap);
1260         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1261                 return 0;
1262         return 1;
1263 }
1264
1265 /*
1266  * Called to check deny when READ with all zero stateid or
1267  * WRITE with all zero or all one stateid
1268  */
1269 static int
1270 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1271 {
1272         struct inode *ino = current_fh->fh_dentry->d_inode;
1273         struct nfs4_file *fp;
1274         struct nfs4_stateid *stp;
1275         int ret;
1276
1277         dprintk("NFSD: nfs4_share_conflict\n");
1278
1279         fp = find_file(ino);
1280         if (!fp)
1281                 return nfs_ok;
1282         ret = nfserr_locked;
1283         /* Search for conflicting share reservations */
1284         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1285                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1286                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1287                         goto out;
1288         }
1289         ret = nfs_ok;
1290 out:
1291         put_nfs4_file(fp);
1292         return ret;
1293 }
1294
1295 static inline void
1296 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1297 {
1298         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1299                 put_write_access(filp->f_dentry->d_inode);
1300                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1301         }
1302 }
1303
1304 /*
1305  * Recall a delegation
1306  */
1307 static int
1308 do_recall(void *__dp)
1309 {
1310         struct nfs4_delegation *dp = __dp;
1311
1312         daemonize("nfsv4-recall");
1313
1314         nfsd4_cb_recall(dp);
1315         return 0;
1316 }
1317
1318 /*
1319  * Spawn a thread to perform a recall on the delegation represented
1320  * by the lease (file_lock)
1321  *
1322  * Called from break_lease() with lock_kernel() held.
1323  * Note: we assume break_lease will only call this *once* for any given
1324  * lease.
1325  */
1326 static
1327 void nfsd_break_deleg_cb(struct file_lock *fl)
1328 {
1329         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1330         struct task_struct *t;
1331
1332         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1333         if (!dp)
1334                 return;
1335
1336         /* We're assuming the state code never drops its reference
1337          * without first removing the lease.  Since we're in this lease
1338          * callback (and since the lease code is serialized by the kernel
1339          * lock) we know the server hasn't removed the lease yet, we know
1340          * it's safe to take a reference: */
1341         atomic_inc(&dp->dl_count);
1342
1343         spin_lock(&recall_lock);
1344         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1345         spin_unlock(&recall_lock);
1346
1347         /* only place dl_time is set. protected by lock_kernel*/
1348         dp->dl_time = get_seconds();
1349
1350         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1351         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1352
1353         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1354         if (IS_ERR(t)) {
1355                 struct nfs4_client *clp = dp->dl_client;
1356
1357                 printk(KERN_INFO "NFSD: Callback thread failed for "
1358                         "for client (clientid %08x/%08x)\n",
1359                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1360                 nfs4_put_delegation(dp);
1361         }
1362 }
1363
1364 /*
1365  * The file_lock is being reapd.
1366  *
1367  * Called by locks_free_lock() with lock_kernel() held.
1368  */
1369 static
1370 void nfsd_release_deleg_cb(struct file_lock *fl)
1371 {
1372         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1373
1374         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1375
1376         if (!(fl->fl_flags & FL_LEASE) || !dp)
1377                 return;
1378         dp->dl_flock = NULL;
1379 }
1380
1381 /*
1382  * Set the delegation file_lock back pointer.
1383  *
1384  * Called from __setlease() with lock_kernel() held.
1385  */
1386 static
1387 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1388 {
1389         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1390
1391         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1392         if (!dp)
1393                 return;
1394         dp->dl_flock = new;
1395 }
1396
1397 /*
1398  * Called from __setlease() with lock_kernel() held
1399  */
1400 static
1401 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1402 {
1403         struct nfs4_delegation *onlistd =
1404                 (struct nfs4_delegation *)onlist->fl_owner;
1405         struct nfs4_delegation *tryd =
1406                 (struct nfs4_delegation *)try->fl_owner;
1407
1408         if (onlist->fl_lmops != try->fl_lmops)
1409                 return 0;
1410
1411         return onlistd->dl_client == tryd->dl_client;
1412 }
1413
1414
1415 static
1416 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1417 {
1418         if (arg & F_UNLCK)
1419                 return lease_modify(onlist, arg);
1420         else
1421                 return -EAGAIN;
1422 }
1423
1424 static struct lock_manager_operations nfsd_lease_mng_ops = {
1425         .fl_break = nfsd_break_deleg_cb,
1426         .fl_release_private = nfsd_release_deleg_cb,
1427         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1428         .fl_mylease = nfsd_same_client_deleg_cb,
1429         .fl_change = nfsd_change_deleg_cb,
1430 };
1431
1432
1433 int
1434 nfsd4_process_open1(struct nfsd4_open *open)
1435 {
1436         clientid_t *clientid = &open->op_clientid;
1437         struct nfs4_client *clp = NULL;
1438         unsigned int strhashval;
1439         struct nfs4_stateowner *sop = NULL;
1440
1441         if (!check_name(open->op_owner))
1442                 return nfserr_inval;
1443
1444         if (STALE_CLIENTID(&open->op_clientid))
1445                 return nfserr_stale_clientid;
1446
1447         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1448         sop = find_openstateowner_str(strhashval, open);
1449         open->op_stateowner = sop;
1450         if (!sop) {
1451                 /* Make sure the client's lease hasn't expired. */
1452                 clp = find_confirmed_client(clientid);
1453                 if (clp == NULL)
1454                         return nfserr_expired;
1455                 goto renew;
1456         }
1457         if (!sop->so_confirmed) {
1458                 /* Replace unconfirmed owners without checking for replay. */
1459                 clp = sop->so_client;
1460                 release_stateowner(sop);
1461                 open->op_stateowner = NULL;
1462                 goto renew;
1463         }
1464         if (open->op_seqid == sop->so_seqid - 1) {
1465                 if (sop->so_replay.rp_buflen)
1466                         return NFSERR_REPLAY_ME;
1467                 /* The original OPEN failed so spectacularly
1468                  * that we don't even have replay data saved!
1469                  * Therefore, we have no choice but to continue
1470                  * processing this OPEN; presumably, we'll
1471                  * fail again for the same reason.
1472                  */
1473                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1474                 goto renew;
1475         }
1476         if (open->op_seqid != sop->so_seqid)
1477                 return nfserr_bad_seqid;
1478 renew:
1479         if (open->op_stateowner == NULL) {
1480                 sop = alloc_init_open_stateowner(strhashval, clp, open);
1481                 if (sop == NULL)
1482                         return nfserr_resource;
1483                 open->op_stateowner = sop;
1484         }
1485         list_del_init(&sop->so_close_lru);
1486         renew_client(sop->so_client);
1487         return nfs_ok;
1488 }
1489
1490 static inline int
1491 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1492 {
1493         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1494                 return nfserr_openmode;
1495         else
1496                 return nfs_ok;
1497 }
1498
1499 static struct nfs4_delegation *
1500 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1501 {
1502         struct nfs4_delegation *dp;
1503
1504         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1505                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1506                         return dp;
1507         }
1508         return NULL;
1509 }
1510
1511 static int
1512 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1513                 struct nfs4_delegation **dp)
1514 {
1515         int flags;
1516         int status = nfserr_bad_stateid;
1517
1518         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1519         if (*dp == NULL)
1520                 goto out;
1521         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1522                                                 RD_STATE : WR_STATE;
1523         status = nfs4_check_delegmode(*dp, flags);
1524         if (status)
1525                 *dp = NULL;
1526 out:
1527         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1528                 return nfs_ok;
1529         if (status)
1530                 return status;
1531         open->op_stateowner->so_confirmed = 1;
1532         return nfs_ok;
1533 }
1534
1535 static int
1536 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1537 {
1538         struct nfs4_stateid *local;
1539         int status = nfserr_share_denied;
1540         struct nfs4_stateowner *sop = open->op_stateowner;
1541
1542         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1543                 /* ignore lock owners */
1544                 if (local->st_stateowner->so_is_open_owner == 0)
1545                         continue;
1546                 /* remember if we have seen this open owner */
1547                 if (local->st_stateowner == sop)
1548                         *stpp = local;
1549                 /* check for conflicting share reservations */
1550                 if (!test_share(local, open))
1551                         goto out;
1552         }
1553         status = 0;
1554 out:
1555         return status;
1556 }
1557
1558 static inline struct nfs4_stateid *
1559 nfs4_alloc_stateid(void)
1560 {
1561         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1562 }
1563
1564 static int
1565 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1566                 struct nfs4_delegation *dp,
1567                 struct svc_fh *cur_fh, int flags)
1568 {
1569         struct nfs4_stateid *stp;
1570
1571         stp = nfs4_alloc_stateid();
1572         if (stp == NULL)
1573                 return nfserr_resource;
1574
1575         if (dp) {
1576                 get_file(dp->dl_vfs_file);
1577                 stp->st_vfs_file = dp->dl_vfs_file;
1578         } else {
1579                 int status;
1580                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1581                                 &stp->st_vfs_file);
1582                 if (status) {
1583                         if (status == nfserr_dropit)
1584                                 status = nfserr_jukebox;
1585                         kmem_cache_free(stateid_slab, stp);
1586                         return status;
1587                 }
1588         }
1589         *stpp = stp;
1590         return 0;
1591 }
1592
1593 static inline int
1594 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1595                 struct nfsd4_open *open)
1596 {
1597         struct iattr iattr = {
1598                 .ia_valid = ATTR_SIZE,
1599                 .ia_size = 0,
1600         };
1601         if (!open->op_truncate)
1602                 return 0;
1603         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1604                 return nfserr_inval;
1605         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1606 }
1607
1608 static int
1609 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1610 {
1611         struct file *filp = stp->st_vfs_file;
1612         struct inode *inode = filp->f_dentry->d_inode;
1613         unsigned int share_access, new_writer;
1614         int status;
1615
1616         set_access(&share_access, stp->st_access_bmap);
1617         new_writer = (~share_access) & open->op_share_access
1618                         & NFS4_SHARE_ACCESS_WRITE;
1619
1620         if (new_writer) {
1621                 status = get_write_access(inode);
1622                 if (status)
1623                         return nfserrno(status);
1624         }
1625         status = nfsd4_truncate(rqstp, cur_fh, open);
1626         if (status) {
1627                 if (new_writer)
1628                         put_write_access(inode);
1629                 return status;
1630         }
1631         /* remember the open */
1632         filp->f_mode |= open->op_share_access;
1633         set_bit(open->op_share_access, &stp->st_access_bmap);
1634         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1635
1636         return nfs_ok;
1637 }
1638
1639
1640 static void
1641 nfs4_set_claim_prev(struct nfsd4_open *open)
1642 {
1643         open->op_stateowner->so_confirmed = 1;
1644         open->op_stateowner->so_client->cl_firststate = 1;
1645 }
1646
1647 /*
1648  * Attempt to hand out a delegation.
1649  */
1650 static void
1651 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1652 {
1653         struct nfs4_delegation *dp;
1654         struct nfs4_stateowner *sop = stp->st_stateowner;
1655         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1656         struct file_lock fl, *flp = &fl;
1657         int status, flag = 0;
1658
1659         flag = NFS4_OPEN_DELEGATE_NONE;
1660         open->op_recall = 0;
1661         switch (open->op_claim_type) {
1662                 case NFS4_OPEN_CLAIM_PREVIOUS:
1663                         if (!atomic_read(&cb->cb_set))
1664                                 open->op_recall = 1;
1665                         flag = open->op_delegate_type;
1666                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1667                                 goto out;
1668                         break;
1669                 case NFS4_OPEN_CLAIM_NULL:
1670                         /* Let's not give out any delegations till everyone's
1671                          * had the chance to reclaim theirs.... */
1672                         if (nfs4_in_grace())
1673                                 goto out;
1674                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1675                                 goto out;
1676                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1677                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1678                         else
1679                                 flag = NFS4_OPEN_DELEGATE_READ;
1680                         break;
1681                 default:
1682                         goto out;
1683         }
1684
1685         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1686         if (dp == NULL) {
1687                 flag = NFS4_OPEN_DELEGATE_NONE;
1688                 goto out;
1689         }
1690         locks_init_lock(&fl);
1691         fl.fl_lmops = &nfsd_lease_mng_ops;
1692         fl.fl_flags = FL_LEASE;
1693         fl.fl_end = OFFSET_MAX;
1694         fl.fl_owner =  (fl_owner_t)dp;
1695         fl.fl_file = stp->st_vfs_file;
1696         fl.fl_pid = current->tgid;
1697
1698         /* setlease checks to see if delegation should be handed out.
1699          * the lock_manager callbacks fl_mylease and fl_change are used
1700          */
1701         if ((status = setlease(stp->st_vfs_file,
1702                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1703                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1704                 unhash_delegation(dp);
1705                 flag = NFS4_OPEN_DELEGATE_NONE;
1706                 goto out;
1707         }
1708
1709         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1710
1711         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1712                      dp->dl_stateid.si_boot,
1713                      dp->dl_stateid.si_stateownerid,
1714                      dp->dl_stateid.si_fileid,
1715                      dp->dl_stateid.si_generation);
1716 out:
1717         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1718                         && flag == NFS4_OPEN_DELEGATE_NONE
1719                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1720                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1721         open->op_delegate_type = flag;
1722 }
1723
1724 /*
1725  * called with nfs4_lock_state() held.
1726  */
1727 int
1728 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1729 {
1730         struct nfs4_file *fp = NULL;
1731         struct inode *ino = current_fh->fh_dentry->d_inode;
1732         struct nfs4_stateid *stp = NULL;
1733         struct nfs4_delegation *dp = NULL;
1734         int status;
1735
1736         status = nfserr_inval;
1737         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1738                 goto out;
1739         /*
1740          * Lookup file; if found, lookup stateid and check open request,
1741          * and check for delegations in the process of being recalled.
1742          * If not found, create the nfs4_file struct
1743          */
1744         fp = find_file(ino);
1745         if (fp) {
1746                 if ((status = nfs4_check_open(fp, open, &stp)))
1747                         goto out;
1748                 status = nfs4_check_deleg(fp, open, &dp);
1749                 if (status)
1750                         goto out;
1751         } else {
1752                 status = nfserr_bad_stateid;
1753                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1754                         goto out;
1755                 status = nfserr_resource;
1756                 fp = alloc_init_file(ino);
1757                 if (fp == NULL)
1758                         goto out;
1759         }
1760
1761         /*
1762          * OPEN the file, or upgrade an existing OPEN.
1763          * If truncate fails, the OPEN fails.
1764          */
1765         if (stp) {
1766                 /* Stateid was found, this is an OPEN upgrade */
1767                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1768                 if (status)
1769                         goto out;
1770                 update_stateid(&stp->st_stateid);
1771         } else {
1772                 /* Stateid was not found, this is a new OPEN */
1773                 int flags = 0;
1774                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1775                         flags = MAY_WRITE;
1776                 else
1777                         flags = MAY_READ;
1778                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1779                 if (status)
1780                         goto out;
1781                 init_stateid(stp, fp, open);
1782                 status = nfsd4_truncate(rqstp, current_fh, open);
1783                 if (status) {
1784                         release_stateid(stp, OPEN_STATE);
1785                         goto out;
1786                 }
1787         }
1788         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1789
1790         /*
1791         * Attempt to hand out a delegation. No error return, because the
1792         * OPEN succeeds even if we fail.
1793         */
1794         nfs4_open_delegation(current_fh, open, stp);
1795
1796         status = nfs_ok;
1797
1798         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1799                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1800                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1801 out:
1802         if (fp)
1803                 put_nfs4_file(fp);
1804         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1805                 nfs4_set_claim_prev(open);
1806         /*
1807         * To finish the open response, we just need to set the rflags.
1808         */
1809         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1810         if (!open->op_stateowner->so_confirmed)
1811                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1812
1813         return status;
1814 }
1815
1816 static struct workqueue_struct *laundry_wq;
1817 static struct work_struct laundromat_work;
1818 static void laundromat_main(void *);
1819 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1820
1821 int 
1822 nfsd4_renew(clientid_t *clid)
1823 {
1824         struct nfs4_client *clp;
1825         int status;
1826
1827         nfs4_lock_state();
1828         dprintk("process_renew(%08x/%08x): starting\n", 
1829                         clid->cl_boot, clid->cl_id);
1830         status = nfserr_stale_clientid;
1831         if (STALE_CLIENTID(clid))
1832                 goto out;
1833         clp = find_confirmed_client(clid);
1834         status = nfserr_expired;
1835         if (clp == NULL) {
1836                 /* We assume the client took too long to RENEW. */
1837                 dprintk("nfsd4_renew: clientid not found!\n");
1838                 goto out;
1839         }
1840         renew_client(clp);
1841         status = nfserr_cb_path_down;
1842         if (!list_empty(&clp->cl_delegations)
1843                         && !atomic_read(&clp->cl_callback.cb_set))
1844                 goto out;
1845         status = nfs_ok;
1846 out:
1847         nfs4_unlock_state();
1848         return status;
1849 }
1850
1851 static void
1852 end_grace(void)
1853 {
1854         dprintk("NFSD: end of grace period\n");
1855         nfsd4_recdir_purge_old();
1856         in_grace = 0;
1857 }
1858
1859 static time_t
1860 nfs4_laundromat(void)
1861 {
1862         struct nfs4_client *clp;
1863         struct nfs4_stateowner *sop;
1864         struct nfs4_delegation *dp;
1865         struct list_head *pos, *next, reaplist;
1866         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1867         time_t t, clientid_val = NFSD_LEASE_TIME;
1868         time_t u, test_val = NFSD_LEASE_TIME;
1869
1870         nfs4_lock_state();
1871
1872         dprintk("NFSD: laundromat service - starting\n");
1873         if (in_grace)
1874                 end_grace();
1875         list_for_each_safe(pos, next, &client_lru) {
1876                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1877                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1878                         t = clp->cl_time - cutoff;
1879                         if (clientid_val > t)
1880                                 clientid_val = t;
1881                         break;
1882                 }
1883                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1884                         clp->cl_clientid.cl_id);
1885                 nfsd4_remove_clid_dir(clp);
1886                 expire_client(clp);
1887         }
1888         INIT_LIST_HEAD(&reaplist);
1889         spin_lock(&recall_lock);
1890         list_for_each_safe(pos, next, &del_recall_lru) {
1891                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1892                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1893                         u = dp->dl_time - cutoff;
1894                         if (test_val > u)
1895                                 test_val = u;
1896                         break;
1897                 }
1898                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1899                                     dp, dp->dl_flock);
1900                 list_move(&dp->dl_recall_lru, &reaplist);
1901         }
1902         spin_unlock(&recall_lock);
1903         list_for_each_safe(pos, next, &reaplist) {
1904                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1905                 list_del_init(&dp->dl_recall_lru);
1906                 unhash_delegation(dp);
1907         }
1908         test_val = NFSD_LEASE_TIME;
1909         list_for_each_safe(pos, next, &close_lru) {
1910                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1911                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1912                         u = sop->so_time - cutoff;
1913                         if (test_val > u)
1914                                 test_val = u;
1915                         break;
1916                 }
1917                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1918                         sop->so_id);
1919                 list_del(&sop->so_close_lru);
1920                 nfs4_put_stateowner(sop);
1921         }
1922         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1923                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1924         nfs4_unlock_state();
1925         return clientid_val;
1926 }
1927
1928 void
1929 laundromat_main(void *not_used)
1930 {
1931         time_t t;
1932
1933         t = nfs4_laundromat();
1934         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1935         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1936 }
1937
1938 static struct nfs4_stateowner *
1939 search_close_lru(u32 st_id, int flags)
1940 {
1941         struct nfs4_stateowner *local = NULL;
1942
1943         if (flags & CLOSE_STATE) {
1944                 list_for_each_entry(local, &close_lru, so_close_lru) {
1945                         if (local->so_id == st_id)
1946                                 return local;
1947                 }
1948         }
1949         return NULL;
1950 }
1951
1952 static inline int
1953 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1954 {
1955         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1956 }
1957
1958 static int
1959 STALE_STATEID(stateid_t *stateid)
1960 {
1961         if (stateid->si_boot == boot_time)
1962                 return 0;
1963         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1964                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1965                 stateid->si_generation);
1966         return 1;
1967 }
1968
1969 static inline int
1970 access_permit_read(unsigned long access_bmap)
1971 {
1972         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1973                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1974                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1975 }
1976
1977 static inline int
1978 access_permit_write(unsigned long access_bmap)
1979 {
1980         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1981                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1982 }
1983
1984 static
1985 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1986 {
1987         int status = nfserr_openmode;
1988
1989         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1990                 goto out;
1991         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1992                 goto out;
1993         status = nfs_ok;
1994 out:
1995         return status;
1996 }
1997
1998 static inline int
1999 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2000 {
2001         /* Trying to call delegreturn with a special stateid? Yuch: */
2002         if (!(flags & (RD_STATE | WR_STATE)))
2003                 return nfserr_bad_stateid;
2004         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2005                 return nfs_ok;
2006         else if (nfs4_in_grace()) {
2007                 /* Answer in remaining cases depends on existance of
2008                  * conflicting state; so we must wait out the grace period. */
2009                 return nfserr_grace;
2010         } else if (flags & WR_STATE)
2011                 return nfs4_share_conflict(current_fh,
2012                                 NFS4_SHARE_DENY_WRITE);
2013         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2014                 return nfs4_share_conflict(current_fh,
2015                                 NFS4_SHARE_DENY_READ);
2016 }
2017
2018 /*
2019  * Allow READ/WRITE during grace period on recovered state only for files
2020  * that are not able to provide mandatory locking.
2021  */
2022 static inline int
2023 io_during_grace_disallowed(struct inode *inode, int flags)
2024 {
2025         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2026                 && MANDATORY_LOCK(inode);
2027 }
2028
2029 /*
2030 * Checks for stateid operations
2031 */
2032 int
2033 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2034 {
2035         struct nfs4_stateid *stp = NULL;
2036         struct nfs4_delegation *dp = NULL;
2037         stateid_t *stidp;
2038         struct inode *ino = current_fh->fh_dentry->d_inode;
2039         int status;
2040
2041         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2042                 stateid->si_boot, stateid->si_stateownerid, 
2043                 stateid->si_fileid, stateid->si_generation); 
2044         if (filpp)
2045                 *filpp = NULL;
2046
2047         if (io_during_grace_disallowed(ino, flags))
2048                 return nfserr_grace;
2049
2050         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2051                 return check_special_stateids(current_fh, stateid, flags);
2052
2053         /* STALE STATEID */
2054         status = nfserr_stale_stateid;
2055         if (STALE_STATEID(stateid)) 
2056                 goto out;
2057
2058         /* BAD STATEID */
2059         status = nfserr_bad_stateid;
2060         if (!stateid->si_fileid) { /* delegation stateid */
2061                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2062                         dprintk("NFSD: delegation stateid not found\n");
2063                         if (nfs4_in_grace())
2064                                 status = nfserr_grace;
2065                         goto out;
2066                 }
2067                 stidp = &dp->dl_stateid;
2068         } else { /* open or lock stateid */
2069                 if (!(stp = find_stateid(stateid, flags))) {
2070                         dprintk("NFSD: open or lock stateid not found\n");
2071                         if (nfs4_in_grace())
2072                                 status = nfserr_grace;
2073                         goto out;
2074                 }
2075                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2076                         goto out;
2077                 if (!stp->st_stateowner->so_confirmed)
2078                         goto out;
2079                 stidp = &stp->st_stateid;
2080         }
2081         if (stateid->si_generation > stidp->si_generation)
2082                 goto out;
2083
2084         /* OLD STATEID */
2085         status = nfserr_old_stateid;
2086         if (stateid->si_generation < stidp->si_generation)
2087                 goto out;
2088         if (stp) {
2089                 if ((status = nfs4_check_openmode(stp,flags)))
2090                         goto out;
2091                 renew_client(stp->st_stateowner->so_client);
2092                 if (filpp)
2093                         *filpp = stp->st_vfs_file;
2094         } else if (dp) {
2095                 if ((status = nfs4_check_delegmode(dp, flags)))
2096                         goto out;
2097                 renew_client(dp->dl_client);
2098                 if (flags & DELEG_RET)
2099                         unhash_delegation(dp);
2100                 if (filpp)
2101                         *filpp = dp->dl_vfs_file;
2102         }
2103         status = nfs_ok;
2104 out:
2105         return status;
2106 }
2107
2108 static inline int
2109 setlkflg (int type)
2110 {
2111         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2112                 RD_STATE : WR_STATE;
2113 }
2114
2115 /* 
2116  * Checks for sequence id mutating operations. 
2117  */
2118 static int
2119 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
2120 {
2121         struct nfs4_stateid *stp;
2122         struct nfs4_stateowner *sop;
2123
2124         dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
2125                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2126                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2127                 stateid->si_generation);
2128
2129         *stpp = NULL;
2130         *sopp = NULL;
2131
2132         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2133                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2134                 return nfserr_bad_stateid;
2135         }
2136
2137         if (STALE_STATEID(stateid))
2138                 return nfserr_stale_stateid;
2139         /*
2140         * We return BAD_STATEID if filehandle doesn't match stateid, 
2141         * the confirmed flag is incorrecly set, or the generation 
2142         * number is incorrect.  
2143         */
2144         stp = find_stateid(stateid, flags);
2145         if (stp == NULL) {
2146                 /*
2147                  * Also, we should make sure this isn't just the result of
2148                  * a replayed close:
2149                  */
2150                 sop = search_close_lru(stateid->si_stateownerid, flags);
2151                 if (sop == NULL)
2152                         return nfserr_bad_stateid;
2153                 *sopp = sop;
2154                 goto check_replay;
2155         }
2156
2157         if (lock) {
2158                 struct nfs4_stateowner *sop = stp->st_stateowner;
2159                 clientid_t *lockclid = &lock->v.new.clientid;
2160                 struct nfs4_client *clp = sop->so_client;
2161                 int lkflg = 0;
2162                 int status;
2163
2164                 lkflg = setlkflg(lock->lk_type);
2165
2166                 if (lock->lk_is_new) {
2167                        if (!sop->so_is_open_owner)
2168                                return nfserr_bad_stateid;
2169                        if (!cmp_clid(&clp->cl_clientid, lockclid))
2170                                return nfserr_bad_stateid;
2171                        /* stp is the open stateid */
2172                        status = nfs4_check_openmode(stp, lkflg);
2173                        if (status)
2174                                return status;
2175                } else {
2176                        /* stp is the lock stateid */
2177                        status = nfs4_check_openmode(stp->st_openstp, lkflg);
2178                        if (status)
2179                                return status;
2180                }
2181
2182         }
2183
2184         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2185                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2186                 return nfserr_bad_stateid;
2187         }
2188
2189         *stpp = stp;
2190         *sopp = sop = stp->st_stateowner;
2191
2192         /*
2193         *  We now validate the seqid and stateid generation numbers.
2194         *  For the moment, we ignore the possibility of 
2195         *  generation number wraparound.
2196         */
2197         if (seqid != sop->so_seqid)
2198                 goto check_replay;
2199
2200         if (sop->so_confirmed && flags & CONFIRM) {
2201                 printk("NFSD: preprocess_seqid_op: expected"
2202                                 " unconfirmed stateowner!\n");
2203                 return nfserr_bad_stateid;
2204         }
2205         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2206                 printk("NFSD: preprocess_seqid_op: stateowner not"
2207                                 " confirmed yet!\n");
2208                 return nfserr_bad_stateid;
2209         }
2210         if (stateid->si_generation > stp->st_stateid.si_generation) {
2211                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2212                 return nfserr_bad_stateid;
2213         }
2214
2215         if (stateid->si_generation < stp->st_stateid.si_generation) {
2216                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2217                 return nfserr_old_stateid;
2218         }
2219         renew_client(sop->so_client);
2220         return nfs_ok;
2221
2222 check_replay:
2223         if (seqid == sop->so_seqid - 1) {
2224                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2225                 /* indicate replay to calling function */
2226                 return NFSERR_REPLAY_ME;
2227         }
2228         printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2229                         sop->so_seqid, seqid);
2230         *sopp = NULL;
2231         return nfserr_bad_seqid;
2232 }
2233
2234 int
2235 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner)
2236 {
2237         int status;
2238         struct nfs4_stateowner *sop;
2239         struct nfs4_stateid *stp;
2240
2241         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2242                         (int)current_fh->fh_dentry->d_name.len,
2243                         current_fh->fh_dentry->d_name.name);
2244
2245         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2246                 goto out;
2247
2248         nfs4_lock_state();
2249
2250         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2251                                         &oc->oc_req_stateid,
2252                                         CHECK_FH | CONFIRM | OPEN_STATE,
2253                                         &oc->oc_stateowner, &stp, NULL)))
2254                 goto out; 
2255
2256         sop = oc->oc_stateowner;
2257         sop->so_confirmed = 1;
2258         update_stateid(&stp->st_stateid);
2259         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2260         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
2261                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2262                          stp->st_stateid.si_boot,
2263                          stp->st_stateid.si_stateownerid,
2264                          stp->st_stateid.si_fileid,
2265                          stp->st_stateid.si_generation);
2266
2267         nfsd4_create_clid_dir(sop->so_client);
2268 out:
2269         if (oc->oc_stateowner) {
2270                 nfs4_get_stateowner(oc->oc_stateowner);
2271                 *replay_owner = oc->oc_stateowner;
2272         }
2273         nfs4_unlock_state();
2274         return status;
2275 }
2276
2277
2278 /*
2279  * unset all bits in union bitmap (bmap) that
2280  * do not exist in share (from successful OPEN_DOWNGRADE)
2281  */
2282 static void
2283 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2284 {
2285         int i;
2286         for (i = 1; i < 4; i++) {
2287                 if ((i & access) != i)
2288                         __clear_bit(i, bmap);
2289         }
2290 }
2291
2292 static void
2293 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2294 {
2295         int i;
2296         for (i = 0; i < 4; i++) {
2297                 if ((i & deny) != i)
2298                         __clear_bit(i, bmap);
2299         }
2300 }
2301
2302 int
2303 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner)
2304 {
2305         int status;
2306         struct nfs4_stateid *stp;
2307         unsigned int share_access;
2308
2309         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
2310                         (int)current_fh->fh_dentry->d_name.len,
2311                         current_fh->fh_dentry->d_name.name);
2312
2313         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2314                 return nfserr_inval;
2315
2316         nfs4_lock_state();
2317         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
2318                                         &od->od_stateid, 
2319                                         CHECK_FH | OPEN_STATE, 
2320                                         &od->od_stateowner, &stp, NULL)))
2321                 goto out; 
2322
2323         status = nfserr_inval;
2324         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2325                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2326                         stp->st_access_bmap, od->od_share_access);
2327                 goto out;
2328         }
2329         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2330                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2331                         stp->st_deny_bmap, od->od_share_deny);
2332                 goto out;
2333         }
2334         set_access(&share_access, stp->st_access_bmap);
2335         nfs4_file_downgrade(stp->st_vfs_file,
2336                             share_access & ~od->od_share_access);
2337
2338         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2339         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2340
2341         update_stateid(&stp->st_stateid);
2342         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2343         status = nfs_ok;
2344 out:
2345         if (od->od_stateowner) {
2346                 nfs4_get_stateowner(od->od_stateowner);
2347                 *replay_owner = od->od_stateowner;
2348         }
2349         nfs4_unlock_state();
2350         return status;
2351 }
2352
2353 /*
2354  * nfs4_unlock_state() called after encode
2355  */
2356 int
2357 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner)
2358 {
2359         int status;
2360         struct nfs4_stateid *stp;
2361
2362         dprintk("NFSD: nfsd4_close on file %.*s\n", 
2363                         (int)current_fh->fh_dentry->d_name.len,
2364                         current_fh->fh_dentry->d_name.name);
2365
2366         nfs4_lock_state();
2367         /* check close_lru for replay */
2368         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
2369                                         &close->cl_stateid, 
2370                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2371                                         &close->cl_stateowner, &stp, NULL)))
2372                 goto out; 
2373         status = nfs_ok;
2374         update_stateid(&stp->st_stateid);
2375         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2376
2377         /* release_stateid() calls nfsd_close() if needed */
2378         release_stateid(stp, OPEN_STATE);
2379
2380         /* place unused nfs4_stateowners on so_close_lru list to be
2381          * released by the laundromat service after the lease period
2382          * to enable us to handle CLOSE replay
2383          */
2384         if (list_empty(&close->cl_stateowner->so_stateids))
2385                 move_to_close_lru(close->cl_stateowner);
2386 out:
2387         if (close->cl_stateowner) {
2388                 nfs4_get_stateowner(close->cl_stateowner);
2389                 *replay_owner = close->cl_stateowner;
2390         }
2391         nfs4_unlock_state();
2392         return status;
2393 }
2394
2395 int
2396 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2397 {
2398         int status;
2399
2400         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2401                 goto out;
2402
2403         nfs4_lock_state();
2404         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2405         nfs4_unlock_state();
2406 out:
2407         return status;
2408 }
2409
2410
2411 /* 
2412  * Lock owner state (byte-range locks)
2413  */
2414 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2415 #define LOCK_HASH_BITS              8
2416 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2417 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2418
2419 #define lockownerid_hashval(id) \
2420         ((id) & LOCK_HASH_MASK)
2421
2422 static inline unsigned int
2423 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2424                 struct xdr_netobj *ownername)
2425 {
2426         return (file_hashval(inode) + cl_id
2427                         + opaque_hashval(ownername->data, ownername->len))
2428                 & LOCK_HASH_MASK;
2429 }
2430
2431 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2432 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2433 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2434
2435 static struct nfs4_stateid *
2436 find_stateid(stateid_t *stid, int flags)
2437 {
2438         struct nfs4_stateid *local = NULL;
2439         u32 st_id = stid->si_stateownerid;
2440         u32 f_id = stid->si_fileid;
2441         unsigned int hashval;
2442
2443         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2444         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2445                 hashval = stateid_hashval(st_id, f_id);
2446                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2447                         if ((local->st_stateid.si_stateownerid == st_id) &&
2448                             (local->st_stateid.si_fileid == f_id))
2449                                 return local;
2450                 }
2451         } 
2452         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2453                 hashval = stateid_hashval(st_id, f_id);
2454                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2455                         if ((local->st_stateid.si_stateownerid == st_id) &&
2456                             (local->st_stateid.si_fileid == f_id))
2457                                 return local;
2458                 }
2459         }
2460         return NULL;
2461 }
2462
2463 static struct nfs4_delegation *
2464 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2465 {
2466         struct nfs4_file *fp;
2467         struct nfs4_delegation *dl;
2468
2469         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2470                     stid->si_boot, stid->si_stateownerid,
2471                     stid->si_fileid, stid->si_generation);
2472
2473         fp = find_file(ino);
2474         if (!fp)
2475                 return NULL;
2476         dl = find_delegation_file(fp, stid);
2477         put_nfs4_file(fp);
2478         return dl;
2479 }
2480
2481 /*
2482  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2483  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2484  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2485  * locking, this prevents us from being completely protocol-compliant.  The
2486  * real solution to this problem is to start using unsigned file offsets in
2487  * the VFS, but this is a very deep change!
2488  */
2489 static inline void
2490 nfs4_transform_lock_offset(struct file_lock *lock)
2491 {
2492         if (lock->fl_start < 0)
2493                 lock->fl_start = OFFSET_MAX;
2494         if (lock->fl_end < 0)
2495                 lock->fl_end = OFFSET_MAX;
2496 }
2497
2498 static int
2499 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2500 {
2501         struct nfs4_stateowner *local = NULL;
2502         int status = 0;
2503                                 
2504         if (hashval >= LOCK_HASH_SIZE)
2505                 goto out;
2506         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2507                 if (local == sop) {
2508                         status = 1;
2509                         goto out;
2510                 }
2511         }
2512 out:
2513         return status;
2514 }
2515
2516
2517 static inline void
2518 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2519 {
2520         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2521         unsigned int hval = lockownerid_hashval(sop->so_id);
2522
2523         deny->ld_sop = NULL;
2524         if (nfs4_verify_lock_stateowner(sop, hval)) {
2525                 kref_get(&sop->so_ref);
2526                 deny->ld_sop = sop;
2527                 deny->ld_clientid = sop->so_client->cl_clientid;
2528         }
2529         deny->ld_start = fl->fl_start;
2530         deny->ld_length = ~(u64)0;
2531         if (fl->fl_end != ~(u64)0)
2532                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
2533         deny->ld_type = NFS4_READ_LT;
2534         if (fl->fl_type != F_RDLCK)
2535                 deny->ld_type = NFS4_WRITE_LT;
2536 }
2537
2538 static struct nfs4_stateowner *
2539 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2540                 struct xdr_netobj *owner)
2541 {
2542         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2543         struct nfs4_stateowner *op;
2544
2545         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2546                 if (cmp_owner_str(op, owner, clid))
2547                         return op;
2548         }
2549         return NULL;
2550 }
2551
2552 /*
2553  * Alloc a lock owner structure.
2554  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
2555  * occured. 
2556  *
2557  * strhashval = lock_ownerstr_hashval 
2558  */
2559
2560 static struct nfs4_stateowner *
2561 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2562         struct nfs4_stateowner *sop;
2563         struct nfs4_replay *rp;
2564         unsigned int idhashval;
2565
2566         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2567                 return NULL;
2568         idhashval = lockownerid_hashval(current_ownerid);
2569         INIT_LIST_HEAD(&sop->so_idhash);
2570         INIT_LIST_HEAD(&sop->so_strhash);
2571         INIT_LIST_HEAD(&sop->so_perclient);
2572         INIT_LIST_HEAD(&sop->so_stateids);
2573         INIT_LIST_HEAD(&sop->so_perstateid);
2574         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2575         sop->so_time = 0;
2576         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2577         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2578         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2579         sop->so_is_open_owner = 0;
2580         sop->so_id = current_ownerid++;
2581         sop->so_client = clp;
2582         /* It is the openowner seqid that will be incremented in encode in the
2583          * case of new lockowners; so increment the lock seqid manually: */
2584         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2585         sop->so_confirmed = 1;
2586         rp = &sop->so_replay;
2587         rp->rp_status = nfserr_serverfault;
2588         rp->rp_buflen = 0;
2589         rp->rp_buf = rp->rp_ibuf;
2590         return sop;
2591 }
2592
2593 static struct nfs4_stateid *
2594 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2595 {
2596         struct nfs4_stateid *stp;
2597         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2598
2599         stp = nfs4_alloc_stateid();
2600         if (stp == NULL)
2601                 goto out;
2602         INIT_LIST_HEAD(&stp->st_hash);
2603         INIT_LIST_HEAD(&stp->st_perfile);
2604         INIT_LIST_HEAD(&stp->st_perstateowner);
2605         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2606         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2607         list_add(&stp->st_perfile, &fp->fi_stateids);
2608         list_add(&stp->st_perstateowner, &sop->so_stateids);
2609         stp->st_stateowner = sop;
2610         get_nfs4_file(fp);
2611         stp->st_file = fp;
2612         stp->st_stateid.si_boot = boot_time;
2613         stp->st_stateid.si_stateownerid = sop->so_id;
2614         stp->st_stateid.si_fileid = fp->fi_id;
2615         stp->st_stateid.si_generation = 0;
2616         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2617         stp->st_access_bmap = open_stp->st_access_bmap;
2618         stp->st_deny_bmap = open_stp->st_deny_bmap;
2619         stp->st_openstp = open_stp;
2620
2621 out:
2622         return stp;
2623 }
2624
2625 static int
2626 check_lock_length(u64 offset, u64 length)
2627 {
2628         return ((length == 0)  || ((length != ~(u64)0) &&
2629              LOFF_OVERFLOW(offset, length)));
2630 }
2631
2632 /*
2633  *  LOCK operation 
2634  */
2635 int
2636 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
2637 {
2638         struct nfs4_stateowner *open_sop = NULL;
2639         struct nfs4_stateowner *lock_sop = NULL;
2640         struct nfs4_stateid *lock_stp;
2641         struct file *filp;
2642         struct file_lock file_lock;
2643         struct file_lock conflock;
2644         int status = 0;
2645         unsigned int strhashval;
2646
2647         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2648                 (long long) lock->lk_offset,
2649                 (long long) lock->lk_length);
2650
2651         if (check_lock_length(lock->lk_offset, lock->lk_length))
2652                  return nfserr_inval;
2653
2654         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2655                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2656                 return status;
2657         }
2658
2659         nfs4_lock_state();
2660
2661         if (lock->lk_is_new) {
2662                 /*
2663                  * Client indicates that this is a new lockowner.
2664                  * Use open owner and open stateid to create lock owner and
2665                  * lock stateid.
2666                  */
2667                 struct nfs4_stateid *open_stp = NULL;
2668                 struct nfs4_file *fp;
2669                 
2670                 status = nfserr_stale_clientid;
2671                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2672                         goto out;
2673
2674                 /* validate and update open stateid and open seqid */
2675                 status = nfs4_preprocess_seqid_op(current_fh, 
2676                                         lock->lk_new_open_seqid,
2677                                         &lock->lk_new_open_stateid,
2678                                         CHECK_FH | OPEN_STATE,
2679                                         &lock->lk_replay_owner, &open_stp,
2680                                         lock);
2681                 if (status)
2682                         goto out;
2683                 open_sop = lock->lk_replay_owner;
2684                 /* create lockowner and lock stateid */
2685                 fp = open_stp->st_file;
2686                 strhashval = lock_ownerstr_hashval(fp->fi_inode, 
2687                                 open_sop->so_client->cl_clientid.cl_id, 
2688                                 &lock->v.new.owner);
2689                 /* XXX: Do we need to check for duplicate stateowners on
2690                  * the same file, or should they just be allowed (and
2691                  * create new stateids)? */
2692                 status = nfserr_resource;
2693                 lock_sop = alloc_init_lock_stateowner(strhashval,
2694                                 open_sop->so_client, open_stp, lock);
2695                 if (lock_sop == NULL)
2696                         goto out;
2697                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2698                 if (lock_stp == NULL)
2699                         goto out;
2700         } else {
2701                 /* lock (lock owner + lock stateid) already exists */
2702                 status = nfs4_preprocess_seqid_op(current_fh,
2703                                        lock->lk_old_lock_seqid, 
2704                                        &lock->lk_old_lock_stateid, 
2705                                        CHECK_FH | LOCK_STATE, 
2706                                        &lock->lk_replay_owner, &lock_stp, lock);
2707                 if (status)
2708                         goto out;
2709                 lock_sop = lock->lk_replay_owner;
2710         }
2711         /* lock->lk_replay_owner and lock_stp have been created or found */
2712         filp = lock_stp->st_vfs_file;
2713
2714         status = nfserr_grace;
2715         if (nfs4_in_grace() && !lock->lk_reclaim)
2716                 goto out;
2717         status = nfserr_no_grace;
2718         if (!nfs4_in_grace() && lock->lk_reclaim)
2719                 goto out;
2720
2721         locks_init_lock(&file_lock);
2722         switch (lock->lk_type) {
2723                 case NFS4_READ_LT:
2724                 case NFS4_READW_LT:
2725                         file_lock.fl_type = F_RDLCK;
2726                 break;
2727                 case NFS4_WRITE_LT:
2728                 case NFS4_WRITEW_LT:
2729                         file_lock.fl_type = F_WRLCK;
2730                 break;
2731                 default:
2732                         status = nfserr_inval;
2733                 goto out;
2734         }
2735         file_lock.fl_owner = (fl_owner_t)lock_sop;
2736         file_lock.fl_pid = current->tgid;
2737         file_lock.fl_file = filp;
2738         file_lock.fl_flags = FL_POSIX;
2739
2740         file_lock.fl_start = lock->lk_offset;
2741         if ((lock->lk_length == ~(u64)0) || 
2742                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2743                 file_lock.fl_end = ~(u64)0;
2744         else
2745                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2746         nfs4_transform_lock_offset(&file_lock);
2747
2748         /*
2749         * Try to lock the file in the VFS.
2750         * Note: locks.c uses the BKL to protect the inode's lock list.
2751         */
2752
2753         status = posix_lock_file(filp, &file_lock);
2754         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2755         switch (-status) {
2756         case 0: /* success! */
2757                 update_stateid(&lock_stp->st_stateid);
2758                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
2759                                 sizeof(stateid_t));
2760                 goto out;
2761         case (EAGAIN):
2762                 goto conflicting_lock;
2763         case (EDEADLK):
2764                 status = nfserr_deadlock;
2765                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2766                 goto out;
2767         default:        
2768                 status = nfserrno(status);
2769                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2770                 goto out;
2771         }
2772
2773 conflicting_lock:
2774         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2775         status = nfserr_denied;
2776         /* XXX There is a race here. Future patch needed to provide 
2777          * an atomic posix_lock_and_test_file
2778          */
2779         if (!posix_test_lock(filp, &file_lock, &conflock)) {
2780                 status = nfserr_serverfault;
2781                 goto out;
2782         }
2783         nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2784 out:
2785         if (status && lock->lk_is_new && lock_sop)
2786                 release_stateowner(lock_sop);
2787         if (lock->lk_replay_owner) {
2788                 nfs4_get_stateowner(lock->lk_replay_owner);
2789                 *replay_owner = lock->lk_replay_owner;
2790         }
2791         nfs4_unlock_state();
2792         return status;
2793 }
2794
2795 /*
2796  * LOCKT operation
2797  */
2798 int
2799 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2800 {
2801         struct inode *inode;
2802         struct file file;
2803         struct file_lock file_lock;
2804         struct file_lock conflock;
2805         int status;
2806
2807         if (nfs4_in_grace())
2808                 return nfserr_grace;
2809
2810         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2811                  return nfserr_inval;
2812
2813         lockt->lt_stateowner = NULL;
2814         nfs4_lock_state();
2815
2816         status = nfserr_stale_clientid;
2817         if (STALE_CLIENTID(&lockt->lt_clientid))
2818                 goto out;
2819
2820         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2821                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2822                 if (status == nfserr_symlink)
2823                         status = nfserr_inval;
2824                 goto out;
2825         }
2826
2827         inode = current_fh->fh_dentry->d_inode;
2828         locks_init_lock(&file_lock);
2829         switch (lockt->lt_type) {
2830                 case NFS4_READ_LT:
2831                 case NFS4_READW_LT:
2832                         file_lock.fl_type = F_RDLCK;
2833                 break;
2834                 case NFS4_WRITE_LT:
2835                 case NFS4_WRITEW_LT:
2836                         file_lock.fl_type = F_WRLCK;
2837                 break;
2838                 default:
2839                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2840                         status = nfserr_inval;
2841                 goto out;
2842         }
2843
2844         lockt->lt_stateowner = find_lockstateowner_str(inode,
2845                         &lockt->lt_clientid, &lockt->lt_owner);
2846         if (lockt->lt_stateowner)
2847                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2848         file_lock.fl_pid = current->tgid;
2849         file_lock.fl_flags = FL_POSIX;
2850
2851         file_lock.fl_start = lockt->lt_offset;
2852         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2853                 file_lock.fl_end = ~(u64)0;
2854         else
2855                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2856
2857         nfs4_transform_lock_offset(&file_lock);
2858
2859         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2860          * since LOCKT doesn't require an OPEN, and therefore a struct
2861          * file may not exist, pass posix_test_lock a struct file with
2862          * only the dentry:inode set.
2863          */
2864         memset(&file, 0, sizeof (struct file));
2865         file.f_dentry = current_fh->fh_dentry;
2866
2867         status = nfs_ok;
2868         if (posix_test_lock(&file, &file_lock, &conflock)) {
2869                 status = nfserr_denied;
2870                 nfs4_set_lock_denied(&conflock, &lockt->lt_denied);
2871         }
2872 out:
2873         nfs4_unlock_state();
2874         return status;
2875 }
2876
2877 int
2878 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner)
2879 {
2880         struct nfs4_stateid *stp;
2881         struct file *filp = NULL;
2882         struct file_lock file_lock;
2883         int status;
2884                                                         
2885         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2886                 (long long) locku->lu_offset,
2887                 (long long) locku->lu_length);
2888
2889         if (check_lock_length(locku->lu_offset, locku->lu_length))
2890                  return nfserr_inval;
2891
2892         nfs4_lock_state();
2893                                                                                 
2894         if ((status = nfs4_preprocess_seqid_op(current_fh, 
2895                                         locku->lu_seqid, 
2896                                         &locku->lu_stateid, 
2897                                         CHECK_FH | LOCK_STATE, 
2898                                         &locku->lu_stateowner, &stp, NULL)))
2899                 goto out;
2900
2901         filp = stp->st_vfs_file;
2902         BUG_ON(!filp);
2903         locks_init_lock(&file_lock);
2904         file_lock.fl_type = F_UNLCK;
2905         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2906         file_lock.fl_pid = current->tgid;
2907         file_lock.fl_file = filp;
2908         file_lock.fl_flags = FL_POSIX; 
2909         file_lock.fl_start = locku->lu_offset;
2910
2911         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2912                 file_lock.fl_end = ~(u64)0;
2913         else
2914                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2915         nfs4_transform_lock_offset(&file_lock);
2916
2917         /*
2918         *  Try to unlock the file in the VFS.
2919         */
2920         status = posix_lock_file(filp, &file_lock); 
2921         if (status) {
2922                 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2923                 goto out_nfserr;
2924         }
2925         /*
2926         * OK, unlock succeeded; the only thing left to do is update the stateid.
2927         */
2928         update_stateid(&stp->st_stateid);
2929         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2930
2931 out:
2932         if (locku->lu_stateowner) {
2933                 nfs4_get_stateowner(locku->lu_stateowner);
2934                 *replay_owner = locku->lu_stateowner;
2935         }
2936         nfs4_unlock_state();
2937         return status;
2938
2939 out_nfserr:
2940         status = nfserrno(status);
2941         goto out;
2942 }
2943
2944 /*
2945  * returns
2946  *      1: locks held by lockowner
2947  *      0: no locks held by lockowner
2948  */
2949 static int
2950 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2951 {
2952         struct file_lock **flpp;
2953         struct inode *inode = filp->f_dentry->d_inode;
2954         int status = 0;
2955
2956         lock_kernel();
2957         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2958                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2959                         status = 1;
2960                         goto out;
2961                 }
2962         }
2963 out:
2964         unlock_kernel();
2965         return status;
2966 }
2967
2968 int
2969 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2970 {
2971         clientid_t *clid = &rlockowner->rl_clientid;
2972         struct nfs4_stateowner *sop;
2973         struct nfs4_stateid *stp;
2974         struct xdr_netobj *owner = &rlockowner->rl_owner;
2975         struct list_head matches;
2976         int i;
2977         int status;
2978
2979         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2980                 clid->cl_boot, clid->cl_id);
2981
2982         /* XXX check for lease expiration */
2983
2984         status = nfserr_stale_clientid;
2985         if (STALE_CLIENTID(clid))
2986                 return status;
2987
2988         nfs4_lock_state();
2989
2990         status = nfserr_locks_held;
2991         /* XXX: we're doing a linear search through all the lockowners.
2992          * Yipes!  For now we'll just hope clients aren't really using
2993          * release_lockowner much, but eventually we have to fix these
2994          * data structures. */
2995         INIT_LIST_HEAD(&matches);
2996         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2997                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2998                         if (!cmp_owner_str(sop, owner, clid))
2999                                 continue;
3000                         list_for_each_entry(stp, &sop->so_stateids,
3001                                         st_perstateowner) {
3002                                 if (check_for_locks(stp->st_vfs_file, sop))
3003                                         goto out;
3004                                 /* Note: so_perclient unused for lockowners,
3005                                  * so it's OK to fool with here. */
3006                                 list_add(&sop->so_perclient, &matches);
3007                         }
3008                 }
3009         }
3010         /* Clients probably won't expect us to return with some (but not all)
3011          * of the lockowner state released; so don't release any until all
3012          * have been checked. */
3013         status = nfs_ok;
3014         while (!list_empty(&matches)) {
3015                 sop = list_entry(matches.next, struct nfs4_stateowner,
3016                                                                 so_perclient);
3017                 /* unhash_stateowner deletes so_perclient only
3018                  * for openowners. */
3019                 list_del(&sop->so_perclient);
3020                 release_stateowner(sop);
3021         }
3022 out:
3023         nfs4_unlock_state();
3024         return status;
3025 }
3026
3027 static inline struct nfs4_client_reclaim *
3028 alloc_reclaim(void)
3029 {
3030         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3031 }
3032
3033 int
3034 nfs4_has_reclaimed_state(const char *name)
3035 {
3036         unsigned int strhashval = clientstr_hashval(name);
3037         struct nfs4_client *clp;
3038
3039         clp = find_confirmed_client_by_str(name, strhashval);
3040         return clp ? 1 : 0;
3041 }
3042
3043 /*
3044  * failure => all reset bets are off, nfserr_no_grace...
3045  */
3046 int
3047 nfs4_client_to_reclaim(const char *name)
3048 {
3049         unsigned int strhashval;
3050         struct nfs4_client_reclaim *crp = NULL;
3051
3052         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3053         crp = alloc_reclaim();
3054         if (!crp)
3055                 return 0;
3056         strhashval = clientstr_hashval(name);
3057         INIT_LIST_HEAD(&crp->cr_strhash);
3058         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3059         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3060         reclaim_str_hashtbl_size++;
3061         return 1;
3062 }
3063
3064 static void
3065 nfs4_release_reclaim(void)
3066 {
3067         struct nfs4_client_reclaim *crp = NULL;
3068         int i;
3069
3070         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3071                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3072                         crp = list_entry(reclaim_str_hashtbl[i].next,
3073                                         struct nfs4_client_reclaim, cr_strhash);
3074                         list_del(&crp->cr_strhash);
3075                         kfree(crp);
3076                         reclaim_str_hashtbl_size--;
3077                 }
3078         }
3079         BUG_ON(reclaim_str_hashtbl_size);
3080 }
3081
3082 /*
3083  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3084 static struct nfs4_client_reclaim *
3085 nfs4_find_reclaim_client(clientid_t *clid)
3086 {
3087         unsigned int strhashval;
3088         struct nfs4_client *clp;
3089         struct nfs4_client_reclaim *crp = NULL;
3090
3091
3092         /* find clientid in conf_id_hashtbl */
3093         clp = find_confirmed_client(clid);
3094         if (clp == NULL)
3095                 return NULL;
3096
3097         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3098                             clp->cl_name.len, clp->cl_name.data,
3099                             clp->cl_recdir);
3100
3101         /* find clp->cl_name in reclaim_str_hashtbl */
3102         strhashval = clientstr_hashval(clp->cl_recdir);
3103         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3104                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3105                         return crp;
3106                 }
3107         }
3108         return NULL;
3109 }
3110
3111 /*
3112 * Called from OPEN. Look for clientid in reclaim list.
3113 */
3114 int
3115 nfs4_check_open_reclaim(clientid_t *clid)
3116 {
3117         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3118 }
3119
3120 /* initialization to perform at module load time: */
3121
3122 void
3123 nfs4_state_init(void)
3124 {
3125         int i;
3126
3127         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3128                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3129                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3130                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3131                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3132         }
3133         for (i = 0; i < FILE_HASH_SIZE; i++) {
3134                 INIT_LIST_HEAD(&file_hashtbl[i]);
3135         }
3136         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3137                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3138                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3139         }
3140         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3141                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3142                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3143         }
3144         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3145                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3146                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3147         }
3148         memset(&onestateid, ~0, sizeof(stateid_t));
3149         INIT_LIST_HEAD(&close_lru);
3150         INIT_LIST_HEAD(&client_lru);
3151         INIT_LIST_HEAD(&del_recall_lru);
3152         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3153                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3154         reclaim_str_hashtbl_size = 0;
3155 }
3156
3157 static void
3158 nfsd4_load_reboot_recovery_data(void)
3159 {
3160         int status;
3161
3162         nfs4_lock_state();
3163         nfsd4_init_recdir(user_recovery_dirname);
3164         status = nfsd4_recdir_load();
3165         nfs4_unlock_state();
3166         if (status)
3167                 printk("NFSD: Failure reading reboot recovery data\n");
3168 }
3169
3170 /* initialization to perform when the nfsd service is started: */
3171
3172 static void
3173 __nfs4_state_start(void)
3174 {
3175         time_t grace_time;
3176
3177         boot_time = get_seconds();
3178         grace_time = max(user_lease_time, lease_time);
3179         lease_time = user_lease_time;
3180         in_grace = 1;
3181         printk("NFSD: starting %ld-second grace period\n", grace_time);
3182         laundry_wq = create_singlethread_workqueue("nfsd4");
3183         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3184 }
3185
3186 int
3187 nfs4_state_start(void)
3188 {
3189         int status;
3190
3191         if (nfs4_init)
3192                 return 0;
3193         status = nfsd4_init_slabs();
3194         if (status)
3195                 return status;
3196         nfsd4_load_reboot_recovery_data();
3197         __nfs4_state_start();
3198         nfs4_init = 1;
3199         return 0;
3200 }
3201
3202 int
3203 nfs4_in_grace(void)
3204 {
3205         return in_grace;
3206 }
3207
3208 time_t
3209 nfs4_lease_time(void)
3210 {
3211         return lease_time;
3212 }
3213
3214 static void
3215 __nfs4_state_shutdown(void)
3216 {
3217         int i;
3218         struct nfs4_client *clp = NULL;
3219         struct nfs4_delegation *dp = NULL;
3220         struct nfs4_stateowner *sop = NULL;
3221         struct list_head *pos, *next, reaplist;
3222
3223         list_for_each_safe(pos, next, &close_lru) {
3224                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3225                 list_del(&sop->so_close_lru);
3226                 nfs4_put_stateowner(sop);
3227         }
3228
3229         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3230                 while (!list_empty(&conf_id_hashtbl[i])) {
3231                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3232                         expire_client(clp);
3233                 }
3234                 while (!list_empty(&unconf_str_hashtbl[i])) {
3235                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3236                         expire_client(clp);
3237                 }
3238         }
3239         INIT_LIST_HEAD(&reaplist);
3240         spin_lock(&recall_lock);
3241         list_for_each_safe(pos, next, &del_recall_lru) {
3242                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3243                 list_move(&dp->dl_recall_lru, &reaplist);
3244         }
3245         spin_unlock(&recall_lock);
3246         list_for_each_safe(pos, next, &reaplist) {
3247                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3248                 list_del_init(&dp->dl_recall_lru);
3249                 unhash_delegation(dp);
3250         }
3251
3252         cancel_delayed_work(&laundromat_work);
3253         flush_workqueue(laundry_wq);
3254         destroy_workqueue(laundry_wq);
3255         nfsd4_shutdown_recdir();
3256         nfs4_init = 0;
3257 }
3258
3259 void
3260 nfs4_state_shutdown(void)
3261 {
3262         nfs4_lock_state();
3263         nfs4_release_reclaim();
3264         __nfs4_state_shutdown();
3265         nfsd4_free_slabs();
3266         nfs4_unlock_state();
3267 }
3268
3269 static void
3270 nfs4_set_recdir(char *recdir)
3271 {
3272         nfs4_lock_state();
3273         strcpy(user_recovery_dirname, recdir);
3274         nfs4_unlock_state();
3275 }
3276
3277 /*
3278  * Change the NFSv4 recovery directory to recdir.
3279  */
3280 int
3281 nfs4_reset_recoverydir(char *recdir)
3282 {
3283         int status;
3284         struct nameidata nd;
3285
3286         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3287         if (status)
3288                 return status;
3289         status = -ENOTDIR;
3290         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3291                 nfs4_set_recdir(recdir);
3292                 status = 0;
3293         }
3294         path_release(&nd);
3295         return status;
3296 }
3297
3298 /*
3299  * Called when leasetime is changed.
3300  *
3301  * The only way the protocol gives us to handle on-the-fly lease changes is to
3302  * simulate a reboot.  Instead of doing that, we just wait till the next time
3303  * we start to register any changes in lease time.  If the administrator
3304  * really wants to change the lease time *now*, they can go ahead and bring
3305  * nfsd down and then back up again after changing the lease time.
3306  */
3307 void
3308 nfs4_reset_lease(time_t leasetime)
3309 {
3310         lock_kernel();
3311         user_lease_time = leasetime;
3312         unlock_kernel();
3313 }