dc792b6b451340f7e36c722f662b0c0d89168c05
[sfrench/cifs-2.6.git] / fs / nfsd / nfs4state.c
1 /*
2 *  linux/fs/nfsd/nfs4state.c
3 *
4 *  Copyright (c) 2001 The Regents of the University of Michigan.
5 *  All rights reserved.
6 *
7 *  Kendrick Smith <kmsmith@umich.edu>
8 *  Andy Adamson <kandros@umich.edu>
9 *
10 *  Redistribution and use in source and binary forms, with or without
11 *  modification, are permitted provided that the following conditions
12 *  are met:
13 *
14 *  1. Redistributions of source code must retain the above copyright
15 *     notice, this list of conditions and the following disclaimer.
16 *  2. Redistributions in binary form must reproduce the above copyright
17 *     notice, this list of conditions and the following disclaimer in the
18 *     documentation and/or other materials provided with the distribution.
19 *  3. Neither the name of the University nor the names of its
20 *     contributors may be used to endorse or promote products derived
21 *     from this software without specific prior written permission.
22 *
23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 */
36
37 #include <linux/param.h>
38 #include <linux/major.h>
39 #include <linux/slab.h>
40
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/cache.h>
44 #include <linux/mount.h>
45 #include <linux/workqueue.h>
46 #include <linux/smp_lock.h>
47 #include <linux/kthread.h>
48 #include <linux/nfs4.h>
49 #include <linux/nfsd/state.h>
50 #include <linux/nfsd/xdr4.h>
51 #include <linux/namei.h>
52
53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
54
55 /* Globals */
56 static time_t lease_time = 90;     /* default lease time */
57 static time_t user_lease_time = 90;
58 static time_t boot_time;
59 static int in_grace = 1;
60 static u32 current_clientid = 1;
61 static u32 current_ownerid = 1;
62 static u32 current_fileid = 1;
63 static u32 current_delegid = 1;
64 static u32 nfs4_init;
65 static stateid_t zerostateid;             /* bits all 0 */
66 static stateid_t onestateid;              /* bits all 1 */
67
68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
70
71 /* forward declarations */
72 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
73 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
74 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
75 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
76 static void nfs4_set_recdir(char *recdir);
77
78 /* Locking:
79  *
80  * client_sema: 
81  *      protects clientid_hashtbl[], clientstr_hashtbl[],
82  *      unconfstr_hashtbl[], uncofid_hashtbl[].
83  */
84 static DECLARE_MUTEX(client_sema);
85
86 static kmem_cache_t *stateowner_slab = NULL;
87 static kmem_cache_t *file_slab = NULL;
88 static kmem_cache_t *stateid_slab = NULL;
89 static kmem_cache_t *deleg_slab = NULL;
90
91 void
92 nfs4_lock_state(void)
93 {
94         down(&client_sema);
95 }
96
97 void
98 nfs4_unlock_state(void)
99 {
100         up(&client_sema);
101 }
102
103 static inline u32
104 opaque_hashval(const void *ptr, int nbytes)
105 {
106         unsigned char *cptr = (unsigned char *) ptr;
107
108         u32 x = 0;
109         while (nbytes--) {
110                 x *= 37;
111                 x += *cptr++;
112         }
113         return x;
114 }
115
116 /* forward declarations */
117 static void release_stateowner(struct nfs4_stateowner *sop);
118 static void release_stateid(struct nfs4_stateid *stp, int flags);
119
120 /*
121  * Delegation state
122  */
123
124 /* recall_lock protects the del_recall_lru */
125 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
126 static struct list_head del_recall_lru;
127
128 static void
129 free_nfs4_file(struct kref *kref)
130 {
131         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
132         list_del(&fp->fi_hash);
133         iput(fp->fi_inode);
134         kmem_cache_free(file_slab, fp);
135 }
136
137 static inline void
138 put_nfs4_file(struct nfs4_file *fi)
139 {
140         kref_put(&fi->fi_ref, free_nfs4_file);
141 }
142
143 static inline void
144 get_nfs4_file(struct nfs4_file *fi)
145 {
146         kref_get(&fi->fi_ref);
147 }
148
149 static struct nfs4_delegation *
150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
151 {
152         struct nfs4_delegation *dp;
153         struct nfs4_file *fp = stp->st_file;
154         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
155
156         dprintk("NFSD alloc_init_deleg\n");
157         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
158         if (dp == NULL)
159                 return dp;
160         INIT_LIST_HEAD(&dp->dl_perfile);
161         INIT_LIST_HEAD(&dp->dl_perclnt);
162         INIT_LIST_HEAD(&dp->dl_recall_lru);
163         dp->dl_client = clp;
164         get_nfs4_file(fp);
165         dp->dl_file = fp;
166         dp->dl_flock = NULL;
167         get_file(stp->st_vfs_file);
168         dp->dl_vfs_file = stp->st_vfs_file;
169         dp->dl_type = type;
170         dp->dl_recall.cbr_dp = NULL;
171         dp->dl_recall.cbr_ident = cb->cb_ident;
172         dp->dl_recall.cbr_trunc = 0;
173         dp->dl_stateid.si_boot = boot_time;
174         dp->dl_stateid.si_stateownerid = current_delegid++;
175         dp->dl_stateid.si_fileid = 0;
176         dp->dl_stateid.si_generation = 0;
177         dp->dl_fhlen = current_fh->fh_handle.fh_size;
178         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
179                         current_fh->fh_handle.fh_size);
180         dp->dl_time = 0;
181         atomic_set(&dp->dl_count, 1);
182         list_add(&dp->dl_perfile, &fp->fi_delegations);
183         list_add(&dp->dl_perclnt, &clp->cl_delegations);
184         return dp;
185 }
186
187 void
188 nfs4_put_delegation(struct nfs4_delegation *dp)
189 {
190         if (atomic_dec_and_test(&dp->dl_count)) {
191                 dprintk("NFSD: freeing dp %p\n",dp);
192                 put_nfs4_file(dp->dl_file);
193                 kmem_cache_free(deleg_slab, dp);
194         }
195 }
196
197 /* Remove the associated file_lock first, then remove the delegation.
198  * lease_modify() is called to remove the FS_LEASE file_lock from
199  * the i_flock list, eventually calling nfsd's lock_manager
200  * fl_release_callback.
201  */
202 static void
203 nfs4_close_delegation(struct nfs4_delegation *dp)
204 {
205         struct file *filp = dp->dl_vfs_file;
206
207         dprintk("NFSD: close_delegation dp %p\n",dp);
208         dp->dl_vfs_file = NULL;
209         /* The following nfsd_close may not actually close the file,
210          * but we want to remove the lease in any case. */
211         if (dp->dl_flock)
212                 setlease(filp, F_UNLCK, &dp->dl_flock);
213         nfsd_close(filp);
214 }
215
216 /* Called under the state lock. */
217 static void
218 unhash_delegation(struct nfs4_delegation *dp)
219 {
220         list_del_init(&dp->dl_perfile);
221         list_del_init(&dp->dl_perclnt);
222         spin_lock(&recall_lock);
223         list_del_init(&dp->dl_recall_lru);
224         spin_unlock(&recall_lock);
225         nfs4_close_delegation(dp);
226         nfs4_put_delegation(dp);
227 }
228
229 /* 
230  * SETCLIENTID state 
231  */
232
233 /* Hash tables for nfs4_clientid state */
234 #define CLIENT_HASH_BITS                 4
235 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
236 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
237
238 #define clientid_hashval(id) \
239         ((id) & CLIENT_HASH_MASK)
240 #define clientstr_hashval(name) \
241         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
242 /*
243  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
244  * used in reboot/reset lease grace period processing
245  *
246  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
247  * setclientid_confirmed info. 
248  *
249  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
250  * setclientid info.
251  *
252  * client_lru holds client queue ordered by nfs4_client.cl_time
253  * for lease renewal.
254  *
255  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
256  * for last close replay.
257  */
258 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
259 static int reclaim_str_hashtbl_size = 0;
260 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
261 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
262 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
263 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
264 static struct list_head client_lru;
265 static struct list_head close_lru;
266
267 static inline void
268 renew_client(struct nfs4_client *clp)
269 {
270         /*
271         * Move client to the end to the LRU list.
272         */
273         dprintk("renewing client (clientid %08x/%08x)\n", 
274                         clp->cl_clientid.cl_boot, 
275                         clp->cl_clientid.cl_id);
276         list_move_tail(&clp->cl_lru, &client_lru);
277         clp->cl_time = get_seconds();
278 }
279
280 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
281 static int
282 STALE_CLIENTID(clientid_t *clid)
283 {
284         if (clid->cl_boot == boot_time)
285                 return 0;
286         dprintk("NFSD stale clientid (%08x/%08x)\n", 
287                         clid->cl_boot, clid->cl_id);
288         return 1;
289 }
290
291 /* 
292  * XXX Should we use a slab cache ?
293  * This type of memory management is somewhat inefficient, but we use it
294  * anyway since SETCLIENTID is not a common operation.
295  */
296 static inline struct nfs4_client *
297 alloc_client(struct xdr_netobj name)
298 {
299         struct nfs4_client *clp;
300
301         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
302                 memset(clp, 0, sizeof(*clp));
303                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
304                         memcpy(clp->cl_name.data, name.data, name.len);
305                         clp->cl_name.len = name.len;
306                 }
307                 else {
308                         kfree(clp);
309                         clp = NULL;
310                 }
311         }
312         return clp;
313 }
314
315 static inline void
316 free_client(struct nfs4_client *clp)
317 {
318         if (clp->cl_cred.cr_group_info)
319                 put_group_info(clp->cl_cred.cr_group_info);
320         kfree(clp->cl_name.data);
321         kfree(clp);
322 }
323
324 void
325 put_nfs4_client(struct nfs4_client *clp)
326 {
327         if (atomic_dec_and_test(&clp->cl_count))
328                 free_client(clp);
329 }
330
331 static void
332 expire_client(struct nfs4_client *clp)
333 {
334         struct nfs4_stateowner *sop;
335         struct nfs4_delegation *dp;
336         struct nfs4_callback *cb = &clp->cl_callback;
337         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
338         struct list_head reaplist;
339
340         dprintk("NFSD: expire_client cl_count %d\n",
341                             atomic_read(&clp->cl_count));
342
343         /* shutdown rpc client, ending any outstanding recall rpcs */
344         if (atomic_read(&cb->cb_set) == 1 && clnt) {
345                 rpc_shutdown_client(clnt);
346                 clnt = clp->cl_callback.cb_client = NULL;
347         }
348
349         INIT_LIST_HEAD(&reaplist);
350         spin_lock(&recall_lock);
351         while (!list_empty(&clp->cl_delegations)) {
352                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
353                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
354                                 dp->dl_flock);
355                 list_del_init(&dp->dl_perclnt);
356                 list_move(&dp->dl_recall_lru, &reaplist);
357         }
358         spin_unlock(&recall_lock);
359         while (!list_empty(&reaplist)) {
360                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
361                 list_del_init(&dp->dl_recall_lru);
362                 unhash_delegation(dp);
363         }
364         list_del(&clp->cl_idhash);
365         list_del(&clp->cl_strhash);
366         list_del(&clp->cl_lru);
367         while (!list_empty(&clp->cl_openowners)) {
368                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
369                 release_stateowner(sop);
370         }
371         put_nfs4_client(clp);
372 }
373
374 static struct nfs4_client *
375 create_client(struct xdr_netobj name, char *recdir) {
376         struct nfs4_client *clp;
377
378         if (!(clp = alloc_client(name)))
379                 goto out;
380         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
381         atomic_set(&clp->cl_count, 1);
382         atomic_set(&clp->cl_callback.cb_set, 0);
383         INIT_LIST_HEAD(&clp->cl_idhash);
384         INIT_LIST_HEAD(&clp->cl_strhash);
385         INIT_LIST_HEAD(&clp->cl_openowners);
386         INIT_LIST_HEAD(&clp->cl_delegations);
387         INIT_LIST_HEAD(&clp->cl_lru);
388 out:
389         return clp;
390 }
391
392 static void
393 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
394         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
395 }
396
397 static void
398 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
399         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
400         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
401 }
402
403 static void
404 copy_cred(struct svc_cred *target, struct svc_cred *source) {
405
406         target->cr_uid = source->cr_uid;
407         target->cr_gid = source->cr_gid;
408         target->cr_group_info = source->cr_group_info;
409         get_group_info(target->cr_group_info);
410 }
411
412 static inline int
413 same_name(const char *n1, const char *n2) {
414         return 0 == memcmp(n1, n2, HEXDIR_LEN);
415 }
416
417 static int
418 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
419         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
420 }
421
422 static int
423 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
424         return((cl1->cl_boot == cl2->cl_boot) &&
425                 (cl1->cl_id == cl2->cl_id));
426 }
427
428 /* XXX what about NGROUP */
429 static int
430 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
431         return(cr1->cr_uid == cr2->cr_uid);
432
433 }
434
435 static void
436 gen_clid(struct nfs4_client *clp) {
437         clp->cl_clientid.cl_boot = boot_time;
438         clp->cl_clientid.cl_id = current_clientid++; 
439 }
440
441 static void
442 gen_confirm(struct nfs4_client *clp) {
443         struct timespec         tv;
444         u32 *                   p;
445
446         tv = CURRENT_TIME;
447         p = (u32 *)clp->cl_confirm.data;
448         *p++ = tv.tv_sec;
449         *p++ = tv.tv_nsec;
450 }
451
452 static int
453 check_name(struct xdr_netobj name) {
454
455         if (name.len == 0) 
456                 return 0;
457         if (name.len > NFS4_OPAQUE_LIMIT) {
458                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
459                 return 0;
460         }
461         return 1;
462 }
463
464 static void
465 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
466 {
467         unsigned int idhashval;
468
469         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
470         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
471         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
472         list_add_tail(&clp->cl_lru, &client_lru);
473         clp->cl_time = get_seconds();
474 }
475
476 static void
477 move_to_confirmed(struct nfs4_client *clp)
478 {
479         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
480         unsigned int strhashval;
481
482         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
483         list_del_init(&clp->cl_strhash);
484         list_del_init(&clp->cl_idhash);
485         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
486         strhashval = clientstr_hashval(clp->cl_recdir);
487         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
488         renew_client(clp);
489 }
490
491 static struct nfs4_client *
492 find_confirmed_client(clientid_t *clid)
493 {
494         struct nfs4_client *clp;
495         unsigned int idhashval = clientid_hashval(clid->cl_id);
496
497         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
498                 if (cmp_clid(&clp->cl_clientid, clid))
499                         return clp;
500         }
501         return NULL;
502 }
503
504 static struct nfs4_client *
505 find_unconfirmed_client(clientid_t *clid)
506 {
507         struct nfs4_client *clp;
508         unsigned int idhashval = clientid_hashval(clid->cl_id);
509
510         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
511                 if (cmp_clid(&clp->cl_clientid, clid))
512                         return clp;
513         }
514         return NULL;
515 }
516
517 static struct nfs4_client *
518 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
519 {
520         struct nfs4_client *clp;
521
522         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
523                 if (same_name(clp->cl_recdir, dname))
524                         return clp;
525         }
526         return NULL;
527 }
528
529 static struct nfs4_client *
530 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
531 {
532         struct nfs4_client *clp;
533
534         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
535                 if (same_name(clp->cl_recdir, dname))
536                         return clp;
537         }
538         return NULL;
539 }
540
541 /* a helper function for parse_callback */
542 static int
543 parse_octet(unsigned int *lenp, char **addrp)
544 {
545         unsigned int len = *lenp;
546         char *p = *addrp;
547         int n = -1;
548         char c;
549
550         for (;;) {
551                 if (!len)
552                         break;
553                 len--;
554                 c = *p++;
555                 if (c == '.')
556                         break;
557                 if ((c < '0') || (c > '9')) {
558                         n = -1;
559                         break;
560                 }
561                 if (n < 0)
562                         n = 0;
563                 n = (n * 10) + (c - '0');
564                 if (n > 255) {
565                         n = -1;
566                         break;
567                 }
568         }
569         *lenp = len;
570         *addrp = p;
571         return n;
572 }
573
574 /* parse and set the setclientid ipv4 callback address */
575 static int
576 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
577 {
578         int temp = 0;
579         u32 cbaddr = 0;
580         u16 cbport = 0;
581         u32 addrlen = addr_len;
582         char *addr = addr_val;
583         int i, shift;
584
585         /* ipaddress */
586         shift = 24;
587         for(i = 4; i > 0  ; i--) {
588                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
589                         return 0;
590                 }
591                 cbaddr |= (temp << shift);
592                 if (shift > 0)
593                 shift -= 8;
594         }
595         *cbaddrp = cbaddr;
596
597         /* port */
598         shift = 8;
599         for(i = 2; i > 0  ; i--) {
600                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
601                         return 0;
602                 }
603                 cbport |= (temp << shift);
604                 if (shift > 0)
605                         shift -= 8;
606         }
607         *cbportp = cbport;
608         return 1;
609 }
610
611 static void
612 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
613 {
614         struct nfs4_callback *cb = &clp->cl_callback;
615
616         /* Currently, we only support tcp for the callback channel */
617         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
618                 goto out_err;
619
620         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
621                          &cb->cb_addr, &cb->cb_port)))
622                 goto out_err;
623         cb->cb_prog = se->se_callback_prog;
624         cb->cb_ident = se->se_callback_ident;
625         return;
626 out_err:
627         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
628                 "will not receive delegations\n",
629                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
630
631         return;
632 }
633
634 /*
635  * RFC 3010 has a complex implmentation description of processing a 
636  * SETCLIENTID request consisting of 5 bullets, labeled as 
637  * CASE0 - CASE4 below.
638  *
639  * NOTES:
640  *      callback information will be processed in a future patch
641  *
642  *      an unconfirmed record is added when:
643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644  *      CASE 1: confirmed record found with matching name, principal,
645  *              verifier, and clientid.
646  *      CASE 2: confirmed record found with matching name, principal,
647  *              and there is no unconfirmed record with matching
648  *              name and principal
649  *
650  *      an unconfirmed record is replaced when:
651  *      CASE 3: confirmed record found with matching name, principal,
652  *              and an unconfirmed record is found with matching 
653  *              name, principal, and with clientid and
654  *              confirm that does not match the confirmed record.
655  *      CASE 4: there is no confirmed record with matching name and 
656  *              principal. there is an unconfirmed record with 
657  *              matching name, principal.
658  *
659  *      an unconfirmed record is deleted when:
660  *      CASE 1: an unconfirmed record that matches input name, verifier,
661  *              and confirmed clientid.
662  *      CASE 4: any unconfirmed records with matching name and principal
663  *              that exist after an unconfirmed record has been replaced
664  *              as described above.
665  *
666  */
667 int
668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669 {
670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671         struct xdr_netobj       clname = { 
672                 .len = setclid->se_namelen,
673                 .data = setclid->se_name,
674         };
675         nfs4_verifier           clverifier = setclid->se_verf;
676         unsigned int            strhashval;
677         struct nfs4_client      *conf, *unconf, *new;
678         int                     status;
679         char                    dname[HEXDIR_LEN];
680         
681         if (!check_name(clname))
682                 return nfserr_inval;
683
684         status = nfs4_make_rec_clidname(dname, &clname);
685         if (status)
686                 return status;
687
688         /* 
689          * XXX The Duplicate Request Cache (DRC) has been checked (??)
690          * We get here on a DRC miss.
691          */
692
693         strhashval = clientstr_hashval(dname);
694
695         nfs4_lock_state();
696         conf = find_confirmed_client_by_str(dname, strhashval);
697         if (conf) {
698                 /* 
699                  * CASE 0:
700                  * clname match, confirmed, different principal
701                  * or different ip_address
702                  */
703                 status = nfserr_clid_inuse;
704                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
705                                 || conf->cl_addr != ip_addr) {
706                         printk("NFSD: setclientid: string in use by client"
707                         "(clientid %08x/%08x)\n",
708                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
709                         goto out;
710                 }
711         }
712         unconf = find_unconfirmed_client_by_str(dname, strhashval);
713         status = nfserr_resource;
714         if (!conf) {
715                 /* 
716                  * CASE 4:
717                  * placed first, because it is the normal case.
718                  */
719                 if (unconf)
720                         expire_client(unconf);
721                 new = create_client(clname, dname);
722                 if (new == NULL)
723                         goto out;
724                 copy_verf(new, &clverifier);
725                 new->cl_addr = ip_addr;
726                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
727                 gen_clid(new);
728                 gen_confirm(new);
729                 gen_callback(new, setclid);
730                 add_to_unconfirmed(new, strhashval);
731         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
732                 /*
733                  * CASE 1:
734                  * cl_name match, confirmed, principal match
735                  * verifier match: probable callback update
736                  *
737                  * remove any unconfirmed nfs4_client with 
738                  * matching cl_name, cl_verifier, and cl_clientid
739                  *
740                  * create and insert an unconfirmed nfs4_client with same 
741                  * cl_name, cl_verifier, and cl_clientid as existing 
742                  * nfs4_client,  but with the new callback info and a 
743                  * new cl_confirm
744                  */
745                 if (unconf) {
746                         /* Note this is removing unconfirmed {*x***},
747                          * which is stronger than RFC recommended {vxc**}.
748                          * This has the advantage that there is at most
749                          * one {*x***} in either list at any time.
750                          */
751                         expire_client(unconf);
752                 }
753                 new = create_client(clname, dname);
754                 if (new == NULL)
755                         goto out;
756                 copy_verf(new,&conf->cl_verifier);
757                 new->cl_addr = ip_addr;
758                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
759                 copy_clid(new, conf);
760                 gen_confirm(new);
761                 gen_callback(new, setclid);
762                 add_to_unconfirmed(new,strhashval);
763         } else if (!unconf) {
764                 /*
765                  * CASE 2:
766                  * clname match, confirmed, principal match
767                  * verfier does not match
768                  * no unconfirmed. create a new unconfirmed nfs4_client
769                  * using input clverifier, clname, and callback info
770                  * and generate a new cl_clientid and cl_confirm.
771                  */
772                 new = create_client(clname, dname);
773                 if (new == NULL)
774                         goto out;
775                 copy_verf(new,&clverifier);
776                 new->cl_addr = ip_addr;
777                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
778                 gen_clid(new);
779                 gen_confirm(new);
780                 gen_callback(new, setclid);
781                 add_to_unconfirmed(new, strhashval);
782         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
783                 /*      
784                  * CASE3:
785                  * confirmed found (name, principal match)
786                  * confirmed verifier does not match input clverifier
787                  *
788                  * unconfirmed found (name match)
789                  * confirmed->cl_confirm != unconfirmed->cl_confirm
790                  *
791                  * remove unconfirmed.
792                  *
793                  * create an unconfirmed nfs4_client 
794                  * with same cl_name as existing confirmed nfs4_client, 
795                  * but with new callback info, new cl_clientid,
796                  * new cl_verifier and a new cl_confirm
797                  */
798                 expire_client(unconf);
799                 new = create_client(clname, dname);
800                 if (new == NULL)
801                         goto out;
802                 copy_verf(new,&clverifier);
803                 new->cl_addr = ip_addr;
804                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
805                 gen_clid(new);
806                 gen_confirm(new);
807                 gen_callback(new, setclid);
808                 add_to_unconfirmed(new, strhashval);
809         } else {
810                 /* No cases hit !!! */
811                 status = nfserr_inval;
812                 goto out;
813
814         }
815         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
816         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
817         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
818         status = nfs_ok;
819 out:
820         nfs4_unlock_state();
821         return status;
822 }
823
824
825 /*
826  * RFC 3010 has a complex implmentation description of processing a 
827  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
828  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
829  *
830  * NOTE: callback information will be processed here in a future patch
831  */
832 int
833 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
834 {
835         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
836         struct nfs4_client *conf, *unconf;
837         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
838         clientid_t * clid = &setclientid_confirm->sc_clientid;
839         int status;
840
841         if (STALE_CLIENTID(clid))
842                 return nfserr_stale_clientid;
843         /* 
844          * XXX The Duplicate Request Cache (DRC) has been checked (??)
845          * We get here on a DRC miss.
846          */
847
848         nfs4_lock_state();
849
850         conf = find_confirmed_client(clid);
851         unconf = find_unconfirmed_client(clid);
852
853         status = nfserr_clid_inuse;
854         if (conf && conf->cl_addr != ip_addr)
855                 goto out;
856         if (unconf && unconf->cl_addr != ip_addr)
857                 goto out;
858
859         if ((conf && unconf) && 
860             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
861             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
862             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
863             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
864                 /* CASE 1:
865                 * unconf record that matches input clientid and input confirm.
866                 * conf record that matches input clientid.
867                 * conf and unconf records match names, verifiers
868                 */
869                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 
870                         status = nfserr_clid_inuse;
871                 else {
872                         /* XXX: We just turn off callbacks until we can handle
873                           * change request correctly. */
874                         atomic_set(&conf->cl_callback.cb_set, 0);
875                         gen_confirm(conf);
876                         nfsd4_remove_clid_dir(unconf);
877                         expire_client(unconf);
878                         status = nfs_ok;
879
880                 }
881         } else if ((conf && !unconf) ||
882             ((conf && unconf) && 
883              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
884               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
885                 /* CASE 2:
886                  * conf record that matches input clientid.
887                  * if unconf record matches input clientid, then
888                  * unconf->cl_name or unconf->cl_verifier don't match the
889                  * conf record.
890                  */
891                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
892                         status = nfserr_clid_inuse;
893                 else
894                         status = nfs_ok;
895         } else if (!conf && unconf
896                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
897                 /* CASE 3:
898                  * conf record not found.
899                  * unconf record found.
900                  * unconf->cl_confirm matches input confirm
901                  */
902                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
903                         status = nfserr_clid_inuse;
904                 } else {
905                         unsigned int hash =
906                                 clientstr_hashval(unconf->cl_recdir);
907                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
908                                                                         hash);
909                         if (conf) {
910                                 nfsd4_remove_clid_dir(conf);
911                                 expire_client(conf);
912                         }
913                         move_to_confirmed(unconf);
914                         conf = unconf;
915                         status = nfs_ok;
916                 }
917         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
918             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
919                                                                 &confirm)))) {
920                 /* CASE 4:
921                  * conf record not found, or if conf, conf->cl_confirm does not
922                  * match input confirm.
923                  * unconf record not found, or if unconf, unconf->cl_confirm
924                  * does not match input confirm.
925                  */
926                 status = nfserr_stale_clientid;
927         } else {
928                 /* check that we have hit one of the cases...*/
929                 status = nfserr_clid_inuse;
930         }
931 out:
932         if (!status)
933                 nfsd4_probe_callback(conf);
934         nfs4_unlock_state();
935         return status;
936 }
937
938 /* 
939  * Open owner state (share locks)
940  */
941
942 /* hash tables for nfs4_stateowner */
943 #define OWNER_HASH_BITS              8
944 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
945 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
946
947 #define ownerid_hashval(id) \
948         ((id) & OWNER_HASH_MASK)
949 #define ownerstr_hashval(clientid, ownername) \
950         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
951
952 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
953 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
954
955 /* hash table for nfs4_file */
956 #define FILE_HASH_BITS                   8
957 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
958 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
959 /* hash table for (open)nfs4_stateid */
960 #define STATEID_HASH_BITS              10
961 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
962 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
963
964 #define file_hashval(x) \
965         hash_ptr(x, FILE_HASH_BITS)
966 #define stateid_hashval(owner_id, file_id)  \
967         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
968
969 static struct list_head file_hashtbl[FILE_HASH_SIZE];
970 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
971
972 /* OPEN Share state helper functions */
973 static inline struct nfs4_file *
974 alloc_init_file(struct inode *ino)
975 {
976         struct nfs4_file *fp;
977         unsigned int hashval = file_hashval(ino);
978
979         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
980         if (fp) {
981                 kref_init(&fp->fi_ref);
982                 INIT_LIST_HEAD(&fp->fi_hash);
983                 INIT_LIST_HEAD(&fp->fi_stateids);
984                 INIT_LIST_HEAD(&fp->fi_delegations);
985                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
986                 fp->fi_inode = igrab(ino);
987                 fp->fi_id = current_fileid++;
988                 return fp;
989         }
990         return NULL;
991 }
992
993 static void
994 nfsd4_free_slab(kmem_cache_t **slab)
995 {
996         int status;
997
998         if (*slab == NULL)
999                 return;
1000         status = kmem_cache_destroy(*slab);
1001         *slab = NULL;
1002         WARN_ON(status);
1003 }
1004
1005 static void
1006 nfsd4_free_slabs(void)
1007 {
1008         nfsd4_free_slab(&stateowner_slab);
1009         nfsd4_free_slab(&file_slab);
1010         nfsd4_free_slab(&stateid_slab);
1011         nfsd4_free_slab(&deleg_slab);
1012 }
1013
1014 static int
1015 nfsd4_init_slabs(void)
1016 {
1017         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1018                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1019         if (stateowner_slab == NULL)
1020                 goto out_nomem;
1021         file_slab = kmem_cache_create("nfsd4_files",
1022                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1023         if (file_slab == NULL)
1024                 goto out_nomem;
1025         stateid_slab = kmem_cache_create("nfsd4_stateids",
1026                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1027         if (stateid_slab == NULL)
1028                 goto out_nomem;
1029         deleg_slab = kmem_cache_create("nfsd4_delegations",
1030                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1031         if (deleg_slab == NULL)
1032                 goto out_nomem;
1033         return 0;
1034 out_nomem:
1035         nfsd4_free_slabs();
1036         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037         return -ENOMEM;
1038 }
1039
1040 void
1041 nfs4_free_stateowner(struct kref *kref)
1042 {
1043         struct nfs4_stateowner *sop =
1044                 container_of(kref, struct nfs4_stateowner, so_ref);
1045         kfree(sop->so_owner.data);
1046         kmem_cache_free(stateowner_slab, sop);
1047 }
1048
1049 static inline struct nfs4_stateowner *
1050 alloc_stateowner(struct xdr_netobj *owner)
1051 {
1052         struct nfs4_stateowner *sop;
1053
1054         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056                         memcpy(sop->so_owner.data, owner->data, owner->len);
1057                         sop->so_owner.len = owner->len;
1058                         kref_init(&sop->so_ref);
1059                         return sop;
1060                 } 
1061                 kmem_cache_free(stateowner_slab, sop);
1062         }
1063         return NULL;
1064 }
1065
1066 static struct nfs4_stateowner *
1067 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068         struct nfs4_stateowner *sop;
1069         struct nfs4_replay *rp;
1070         unsigned int idhashval;
1071
1072         if (!(sop = alloc_stateowner(&open->op_owner)))
1073                 return NULL;
1074         idhashval = ownerid_hashval(current_ownerid);
1075         INIT_LIST_HEAD(&sop->so_idhash);
1076         INIT_LIST_HEAD(&sop->so_strhash);
1077         INIT_LIST_HEAD(&sop->so_perclient);
1078         INIT_LIST_HEAD(&sop->so_stateids);
1079         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1080         INIT_LIST_HEAD(&sop->so_close_lru);
1081         sop->so_time = 0;
1082         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1084         list_add(&sop->so_perclient, &clp->cl_openowners);
1085         sop->so_is_open_owner = 1;
1086         sop->so_id = current_ownerid++;
1087         sop->so_client = clp;
1088         sop->so_seqid = open->op_seqid;
1089         sop->so_confirmed = 0;
1090         rp = &sop->so_replay;
1091         rp->rp_status = NFSERR_SERVERFAULT;
1092         rp->rp_buflen = 0;
1093         rp->rp_buf = rp->rp_ibuf;
1094         return sop;
1095 }
1096
1097 static void
1098 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099 {
1100         struct nfs4_stateowner *lock_sop;
1101
1102         while (!list_empty(&open_stp->st_lockowners)) {
1103                 lock_sop = list_entry(open_stp->st_lockowners.next,
1104                                 struct nfs4_stateowner, so_perstateid);
1105                 /* list_del(&open_stp->st_lockowners);  */
1106                 BUG_ON(lock_sop->so_is_open_owner);
1107                 release_stateowner(lock_sop);
1108         }
1109 }
1110
1111 static void
1112 unhash_stateowner(struct nfs4_stateowner *sop)
1113 {
1114         struct nfs4_stateid *stp;
1115
1116         list_del(&sop->so_idhash);
1117         list_del(&sop->so_strhash);
1118         if (sop->so_is_open_owner)
1119                 list_del(&sop->so_perclient);
1120         list_del(&sop->so_perstateid);
1121         while (!list_empty(&sop->so_stateids)) {
1122                 stp = list_entry(sop->so_stateids.next,
1123                         struct nfs4_stateid, st_perstateowner);
1124                 if (sop->so_is_open_owner)
1125                         release_stateid(stp, OPEN_STATE);
1126                 else
1127                         release_stateid(stp, LOCK_STATE);
1128         }
1129 }
1130
1131 static void
1132 release_stateowner(struct nfs4_stateowner *sop)
1133 {
1134         unhash_stateowner(sop);
1135         list_del(&sop->so_close_lru);
1136         nfs4_put_stateowner(sop);
1137 }
1138
1139 static inline void
1140 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141         struct nfs4_stateowner *sop = open->op_stateowner;
1142         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144         INIT_LIST_HEAD(&stp->st_hash);
1145         INIT_LIST_HEAD(&stp->st_perstateowner);
1146         INIT_LIST_HEAD(&stp->st_lockowners);
1147         INIT_LIST_HEAD(&stp->st_perfile);
1148         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1149         list_add(&stp->st_perstateowner, &sop->so_stateids);
1150         list_add(&stp->st_perfile, &fp->fi_stateids);
1151         stp->st_stateowner = sop;
1152         get_nfs4_file(fp);
1153         stp->st_file = fp;
1154         stp->st_stateid.si_boot = boot_time;
1155         stp->st_stateid.si_stateownerid = sop->so_id;
1156         stp->st_stateid.si_fileid = fp->fi_id;
1157         stp->st_stateid.si_generation = 0;
1158         stp->st_access_bmap = 0;
1159         stp->st_deny_bmap = 0;
1160         __set_bit(open->op_share_access, &stp->st_access_bmap);
1161         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1162         stp->st_openstp = NULL;
1163 }
1164
1165 static void
1166 release_stateid(struct nfs4_stateid *stp, int flags)
1167 {
1168         struct file *filp = stp->st_vfs_file;
1169
1170         list_del(&stp->st_hash);
1171         list_del(&stp->st_perfile);
1172         list_del(&stp->st_perstateowner);
1173         if (flags & OPEN_STATE) {
1174                 release_stateid_lockowners(stp);
1175                 stp->st_vfs_file = NULL;
1176                 nfsd_close(filp);
1177         } else if (flags & LOCK_STATE)
1178                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1179         put_nfs4_file(stp->st_file);
1180         kmem_cache_free(stateid_slab, stp);
1181 }
1182
1183 static void
1184 move_to_close_lru(struct nfs4_stateowner *sop)
1185 {
1186         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1187
1188         unhash_stateowner(sop);
1189         list_add_tail(&sop->so_close_lru, &close_lru);
1190         sop->so_time = get_seconds();
1191 }
1192
1193 static int
1194 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1195         return ((sop->so_owner.len == owner->len) && 
1196          !memcmp(sop->so_owner.data, owner->data, owner->len) && 
1197           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1198 }
1199
1200 static struct nfs4_stateowner *
1201 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1202 {
1203         struct nfs4_stateowner *so = NULL;
1204
1205         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1206                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1207                         return so;
1208         }
1209         return NULL;
1210 }
1211
1212 /* search file_hashtbl[] for file */
1213 static struct nfs4_file *
1214 find_file(struct inode *ino)
1215 {
1216         unsigned int hashval = file_hashval(ino);
1217         struct nfs4_file *fp;
1218
1219         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1220                 if (fp->fi_inode == ino) {
1221                         get_nfs4_file(fp);
1222                         return fp;
1223                 }
1224         }
1225         return NULL;
1226 }
1227
1228 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1229 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1230
1231 static void
1232 set_access(unsigned int *access, unsigned long bmap) {
1233         int i;
1234
1235         *access = 0;
1236         for (i = 1; i < 4; i++) {
1237                 if (test_bit(i, &bmap))
1238                         *access |= i;
1239         }
1240 }
1241
1242 static void
1243 set_deny(unsigned int *deny, unsigned long bmap) {
1244         int i;
1245
1246         *deny = 0;
1247         for (i = 0; i < 4; i++) {
1248                 if (test_bit(i, &bmap))
1249                         *deny |= i ;
1250         }
1251 }
1252
1253 static int
1254 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1255         unsigned int access, deny;
1256
1257         set_access(&access, stp->st_access_bmap);
1258         set_deny(&deny, stp->st_deny_bmap);
1259         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1260                 return 0;
1261         return 1;
1262 }
1263
1264 /*
1265  * Called to check deny when READ with all zero stateid or
1266  * WRITE with all zero or all one stateid
1267  */
1268 static int
1269 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1270 {
1271         struct inode *ino = current_fh->fh_dentry->d_inode;
1272         struct nfs4_file *fp;
1273         struct nfs4_stateid *stp;
1274         int ret;
1275
1276         dprintk("NFSD: nfs4_share_conflict\n");
1277
1278         fp = find_file(ino);
1279         if (!fp)
1280                 return nfs_ok;
1281         ret = nfserr_locked;
1282         /* Search for conflicting share reservations */
1283         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1284                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1285                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1286                         goto out;
1287         }
1288         ret = nfs_ok;
1289 out:
1290         put_nfs4_file(fp);
1291         return ret;
1292 }
1293
1294 static inline void
1295 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1296 {
1297         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1298                 put_write_access(filp->f_dentry->d_inode);
1299                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1300         }
1301 }
1302
1303 /*
1304  * Recall a delegation
1305  */
1306 static int
1307 do_recall(void *__dp)
1308 {
1309         struct nfs4_delegation *dp = __dp;
1310
1311         daemonize("nfsv4-recall");
1312
1313         nfsd4_cb_recall(dp);
1314         return 0;
1315 }
1316
1317 /*
1318  * Spawn a thread to perform a recall on the delegation represented
1319  * by the lease (file_lock)
1320  *
1321  * Called from break_lease() with lock_kernel() held.
1322  * Note: we assume break_lease will only call this *once* for any given
1323  * lease.
1324  */
1325 static
1326 void nfsd_break_deleg_cb(struct file_lock *fl)
1327 {
1328         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1329         struct task_struct *t;
1330
1331         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1332         if (!dp)
1333                 return;
1334
1335         /* We're assuming the state code never drops its reference
1336          * without first removing the lease.  Since we're in this lease
1337          * callback (and since the lease code is serialized by the kernel
1338          * lock) we know the server hasn't removed the lease yet, we know
1339          * it's safe to take a reference: */
1340         atomic_inc(&dp->dl_count);
1341
1342         spin_lock(&recall_lock);
1343         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1344         spin_unlock(&recall_lock);
1345
1346         /* only place dl_time is set. protected by lock_kernel*/
1347         dp->dl_time = get_seconds();
1348
1349         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1350         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1351
1352         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1353         if (IS_ERR(t)) {
1354                 struct nfs4_client *clp = dp->dl_client;
1355
1356                 printk(KERN_INFO "NFSD: Callback thread failed for "
1357                         "for client (clientid %08x/%08x)\n",
1358                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1359                 nfs4_put_delegation(dp);
1360         }
1361 }
1362
1363 /*
1364  * The file_lock is being reapd.
1365  *
1366  * Called by locks_free_lock() with lock_kernel() held.
1367  */
1368 static
1369 void nfsd_release_deleg_cb(struct file_lock *fl)
1370 {
1371         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1372
1373         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1374
1375         if (!(fl->fl_flags & FL_LEASE) || !dp)
1376                 return;
1377         dp->dl_flock = NULL;
1378 }
1379
1380 /*
1381  * Set the delegation file_lock back pointer.
1382  *
1383  * Called from __setlease() with lock_kernel() held.
1384  */
1385 static
1386 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1387 {
1388         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1389
1390         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1391         if (!dp)
1392                 return;
1393         dp->dl_flock = new;
1394 }
1395
1396 /*
1397  * Called from __setlease() with lock_kernel() held
1398  */
1399 static
1400 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1401 {
1402         struct nfs4_delegation *onlistd =
1403                 (struct nfs4_delegation *)onlist->fl_owner;
1404         struct nfs4_delegation *tryd =
1405                 (struct nfs4_delegation *)try->fl_owner;
1406
1407         if (onlist->fl_lmops != try->fl_lmops)
1408                 return 0;
1409
1410         return onlistd->dl_client == tryd->dl_client;
1411 }
1412
1413
1414 static
1415 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1416 {
1417         if (arg & F_UNLCK)
1418                 return lease_modify(onlist, arg);
1419         else
1420                 return -EAGAIN;
1421 }
1422
1423 static struct lock_manager_operations nfsd_lease_mng_ops = {
1424         .fl_break = nfsd_break_deleg_cb,
1425         .fl_release_private = nfsd_release_deleg_cb,
1426         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1427         .fl_mylease = nfsd_same_client_deleg_cb,
1428         .fl_change = nfsd_change_deleg_cb,
1429 };
1430
1431
1432 /*
1433  * nfsd4_process_open1()
1434  *      lookup stateowner.
1435  *              found:
1436  *                      check confirmed 
1437  *                              confirmed:
1438  *                                      check seqid
1439  *                              not confirmed:
1440  *                                      delete owner
1441  *                                      create new owner
1442  *              notfound:
1443  *                      verify clientid
1444  *                      create new owner
1445  *
1446  * called with nfs4_lock_state() held.
1447  */
1448 int
1449 nfsd4_process_open1(struct nfsd4_open *open)
1450 {
1451         int status;
1452         clientid_t *clientid = &open->op_clientid;
1453         struct nfs4_client *clp = NULL;
1454         unsigned int strhashval;
1455         struct nfs4_stateowner *sop = NULL;
1456
1457         status = nfserr_inval;
1458         if (!check_name(open->op_owner))
1459                 goto out;
1460
1461         if (STALE_CLIENTID(&open->op_clientid))
1462                 return nfserr_stale_clientid;
1463
1464         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1465         sop = find_openstateowner_str(strhashval, open);
1466         if (sop) {
1467                 open->op_stateowner = sop;
1468                 if (!sop->so_confirmed) {
1469                         /* Replace any unconfirmed stateowner without
1470                          * even checking for replays */
1471                         clp = sop->so_client;
1472                         release_stateowner(sop);
1473                 } else if (open->op_seqid == sop->so_seqid) {
1474                         /* normal case */
1475                         goto renew;
1476                 } else if (open->op_seqid == sop->so_seqid - 1) {
1477                         /* replay */
1478                         if (sop->so_replay.rp_buflen)
1479                                 return NFSERR_REPLAY_ME;
1480                         else {
1481                                 /* The original OPEN failed so spectacularly
1482                                  * that we don't even have replay data saved!
1483                                  * Therefore, we have no choice but to continue
1484                                  * processing this OPEN; presumably, we'll
1485                                  * fail again for the same reason.
1486                                  */
1487                                 dprintk("nfsd4_process_open1:"
1488                                         " replay with no replay cache\n");
1489                                 goto renew;
1490                         }
1491                 } else {
1492                         status = nfserr_bad_seqid;
1493                         goto out;
1494                 }
1495         } else {
1496                 /* nfs4_stateowner not found.
1497                  * Verify clientid and instantiate new nfs4_stateowner.
1498                  * If verify fails this is presumably the result of the
1499                  * client's lease expiring.
1500                  */
1501                 status = nfserr_expired;
1502                 clp = find_confirmed_client(clientid);
1503                 if (clp == NULL)
1504                         goto out;
1505         }
1506         status = nfserr_resource;
1507         sop = alloc_init_open_stateowner(strhashval, clp, open);
1508         if (sop == NULL)
1509                 goto out;
1510         open->op_stateowner = sop;
1511 renew:
1512         status = nfs_ok;
1513         renew_client(sop->so_client);
1514 out:
1515         return status;
1516 }
1517
1518 static inline int
1519 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1520 {
1521         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1522                 return nfserr_openmode;
1523         else
1524                 return nfs_ok;
1525 }
1526
1527 static struct nfs4_delegation *
1528 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1529 {
1530         struct nfs4_delegation *dp;
1531
1532         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1533                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1534                         return dp;
1535         }
1536         return NULL;
1537 }
1538
1539 static int
1540 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1541                 struct nfs4_delegation **dp)
1542 {
1543         int flags;
1544         int status = nfserr_bad_stateid;
1545
1546         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1547         if (*dp == NULL)
1548                 goto out;
1549         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1550                                                 RD_STATE : WR_STATE;
1551         status = nfs4_check_delegmode(*dp, flags);
1552         if (status)
1553                 *dp = NULL;
1554 out:
1555         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1556                 return nfs_ok;
1557         if (status)
1558                 return status;
1559         open->op_stateowner->so_confirmed = 1;
1560         return nfs_ok;
1561 }
1562
1563 static int
1564 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1565 {
1566         struct nfs4_stateid *local;
1567         int status = nfserr_share_denied;
1568         struct nfs4_stateowner *sop = open->op_stateowner;
1569
1570         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1571                 /* ignore lock owners */
1572                 if (local->st_stateowner->so_is_open_owner == 0)
1573                         continue;
1574                 /* remember if we have seen this open owner */
1575                 if (local->st_stateowner == sop)
1576                         *stpp = local;
1577                 /* check for conflicting share reservations */
1578                 if (!test_share(local, open))
1579                         goto out;
1580         }
1581         status = 0;
1582 out:
1583         return status;
1584 }
1585
1586 static inline struct nfs4_stateid *
1587 nfs4_alloc_stateid(void)
1588 {
1589         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1590 }
1591
1592 static int
1593 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1594                 struct nfs4_delegation *dp,
1595                 struct svc_fh *cur_fh, int flags)
1596 {
1597         struct nfs4_stateid *stp;
1598
1599         stp = nfs4_alloc_stateid();
1600         if (stp == NULL)
1601                 return nfserr_resource;
1602
1603         if (dp) {
1604                 get_file(dp->dl_vfs_file);
1605                 stp->st_vfs_file = dp->dl_vfs_file;
1606         } else {
1607                 int status;
1608                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1609                                 &stp->st_vfs_file);
1610                 if (status) {
1611                         if (status == nfserr_dropit)
1612                                 status = nfserr_jukebox;
1613                         kmem_cache_free(stateid_slab, stp);
1614                         return status;
1615                 }
1616         }
1617         *stpp = stp;
1618         return 0;
1619 }
1620
1621 static inline int
1622 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1623                 struct nfsd4_open *open)
1624 {
1625         struct iattr iattr = {
1626                 .ia_valid = ATTR_SIZE,
1627                 .ia_size = 0,
1628         };
1629         if (!open->op_truncate)
1630                 return 0;
1631         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1632                 return -EINVAL;
1633         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1634 }
1635
1636 static int
1637 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1638 {
1639         struct file *filp = stp->st_vfs_file;
1640         struct inode *inode = filp->f_dentry->d_inode;
1641         unsigned int share_access;
1642         int status;
1643
1644         set_access(&share_access, stp->st_access_bmap);
1645         share_access = ~share_access;
1646         share_access &= open->op_share_access;
1647
1648         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1649                 return nfsd4_truncate(rqstp, cur_fh, open);
1650
1651         status = get_write_access(inode);
1652         if (status)
1653                 return nfserrno(status);
1654         status = nfsd4_truncate(rqstp, cur_fh, open);
1655         if (status) {
1656                 put_write_access(inode);
1657                 return status;
1658         }
1659         /* remember the open */
1660         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1661         set_bit(open->op_share_access, &stp->st_access_bmap);
1662         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1663
1664         return nfs_ok;
1665 }
1666
1667
1668 static void
1669 nfs4_set_claim_prev(struct nfsd4_open *open)
1670 {
1671         open->op_stateowner->so_confirmed = 1;
1672         open->op_stateowner->so_client->cl_firststate = 1;
1673 }
1674
1675 /*
1676  * Attempt to hand out a delegation.
1677  */
1678 static void
1679 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1680 {
1681         struct nfs4_delegation *dp;
1682         struct nfs4_stateowner *sop = stp->st_stateowner;
1683         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1684         struct file_lock fl, *flp = &fl;
1685         int status, flag = 0;
1686
1687         flag = NFS4_OPEN_DELEGATE_NONE;
1688         open->op_recall = 0;
1689         switch (open->op_claim_type) {
1690                 case NFS4_OPEN_CLAIM_PREVIOUS:
1691                         if (!atomic_read(&cb->cb_set))
1692                                 open->op_recall = 1;
1693                         flag = open->op_delegate_type;
1694                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1695                                 goto out;
1696                         break;
1697                 case NFS4_OPEN_CLAIM_NULL:
1698                         /* Let's not give out any delegations till everyone's
1699                          * had the chance to reclaim theirs.... */
1700                         if (nfs4_in_grace())
1701                                 goto out;
1702                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1703                                 goto out;
1704                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1705                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1706                         else
1707                                 flag = NFS4_OPEN_DELEGATE_READ;
1708                         break;
1709                 default:
1710                         goto out;
1711         }
1712
1713         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1714         if (dp == NULL) {
1715                 flag = NFS4_OPEN_DELEGATE_NONE;
1716                 goto out;
1717         }
1718         locks_init_lock(&fl);
1719         fl.fl_lmops = &nfsd_lease_mng_ops;
1720         fl.fl_flags = FL_LEASE;
1721         fl.fl_end = OFFSET_MAX;
1722         fl.fl_owner =  (fl_owner_t)dp;
1723         fl.fl_file = stp->st_vfs_file;
1724         fl.fl_pid = current->tgid;
1725
1726         /* setlease checks to see if delegation should be handed out.
1727          * the lock_manager callbacks fl_mylease and fl_change are used
1728          */
1729         if ((status = setlease(stp->st_vfs_file,
1730                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1731                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1732                 unhash_delegation(dp);
1733                 flag = NFS4_OPEN_DELEGATE_NONE;
1734                 goto out;
1735         }
1736
1737         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1738
1739         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1740                      dp->dl_stateid.si_boot,
1741                      dp->dl_stateid.si_stateownerid,
1742                      dp->dl_stateid.si_fileid,
1743                      dp->dl_stateid.si_generation);
1744 out:
1745         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1746                         && flag == NFS4_OPEN_DELEGATE_NONE
1747                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1748                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1749         open->op_delegate_type = flag;
1750 }
1751
1752 /*
1753  * called with nfs4_lock_state() held.
1754  */
1755 int
1756 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1757 {
1758         struct nfs4_file *fp = NULL;
1759         struct inode *ino = current_fh->fh_dentry->d_inode;
1760         struct nfs4_stateid *stp = NULL;
1761         struct nfs4_delegation *dp = NULL;
1762         int status;
1763
1764         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1765                 return nfserr_grace;
1766
1767         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1768                 return nfserr_no_grace;
1769
1770         status = nfserr_inval;
1771         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1772                 goto out;
1773         /*
1774          * Lookup file; if found, lookup stateid and check open request,
1775          * and check for delegations in the process of being recalled.
1776          * If not found, create the nfs4_file struct
1777          */
1778         fp = find_file(ino);
1779         if (fp) {
1780                 if ((status = nfs4_check_open(fp, open, &stp)))
1781                         goto out;
1782                 status = nfs4_check_deleg(fp, open, &dp);
1783                 if (status)
1784                         goto out;
1785         } else {
1786                 status = nfserr_bad_stateid;
1787                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1788                         goto out;
1789                 status = nfserr_resource;
1790                 fp = alloc_init_file(ino);
1791                 if (fp == NULL)
1792                         goto out;
1793         }
1794
1795         /*
1796          * OPEN the file, or upgrade an existing OPEN.
1797          * If truncate fails, the OPEN fails.
1798          */
1799         if (stp) {
1800                 /* Stateid was found, this is an OPEN upgrade */
1801                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1802                 if (status)
1803                         goto out;
1804                 update_stateid(&stp->st_stateid);
1805         } else {
1806                 /* Stateid was not found, this is a new OPEN */
1807                 int flags = 0;
1808                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1809                         flags = MAY_WRITE;
1810                 else
1811                         flags = MAY_READ;
1812                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1813                 if (status)
1814                         goto out;
1815                 init_stateid(stp, fp, open);
1816                 status = nfsd4_truncate(rqstp, current_fh, open);
1817                 if (status) {
1818                         release_stateid(stp, OPEN_STATE);
1819                         goto out;
1820                 }
1821         }
1822         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1823
1824         /*
1825         * Attempt to hand out a delegation. No error return, because the
1826         * OPEN succeeds even if we fail.
1827         */
1828         nfs4_open_delegation(current_fh, open, stp);
1829
1830         status = nfs_ok;
1831
1832         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1833                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1834                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1835 out:
1836         if (fp)
1837                 put_nfs4_file(fp);
1838         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1839                 nfs4_set_claim_prev(open);
1840         /*
1841         * To finish the open response, we just need to set the rflags.
1842         */
1843         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1844         if (!open->op_stateowner->so_confirmed)
1845                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1846
1847         return status;
1848 }
1849
1850 static struct workqueue_struct *laundry_wq;
1851 static struct work_struct laundromat_work;
1852 static void laundromat_main(void *);
1853 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1854
1855 int 
1856 nfsd4_renew(clientid_t *clid)
1857 {
1858         struct nfs4_client *clp;
1859         int status;
1860
1861         nfs4_lock_state();
1862         dprintk("process_renew(%08x/%08x): starting\n", 
1863                         clid->cl_boot, clid->cl_id);
1864         status = nfserr_stale_clientid;
1865         if (STALE_CLIENTID(clid))
1866                 goto out;
1867         clp = find_confirmed_client(clid);
1868         status = nfserr_expired;
1869         if (clp == NULL) {
1870                 /* We assume the client took too long to RENEW. */
1871                 dprintk("nfsd4_renew: clientid not found!\n");
1872                 goto out;
1873         }
1874         renew_client(clp);
1875         status = nfserr_cb_path_down;
1876         if (!list_empty(&clp->cl_delegations)
1877                         && !atomic_read(&clp->cl_callback.cb_set))
1878                 goto out;
1879         status = nfs_ok;
1880 out:
1881         nfs4_unlock_state();
1882         return status;
1883 }
1884
1885 static void
1886 end_grace(void)
1887 {
1888         dprintk("NFSD: end of grace period\n");
1889         nfsd4_recdir_purge_old();
1890         in_grace = 0;
1891 }
1892
1893 static time_t
1894 nfs4_laundromat(void)
1895 {
1896         struct nfs4_client *clp;
1897         struct nfs4_stateowner *sop;
1898         struct nfs4_delegation *dp;
1899         struct list_head *pos, *next, reaplist;
1900         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1901         time_t t, clientid_val = NFSD_LEASE_TIME;
1902         time_t u, test_val = NFSD_LEASE_TIME;
1903
1904         nfs4_lock_state();
1905
1906         dprintk("NFSD: laundromat service - starting\n");
1907         if (in_grace)
1908                 end_grace();
1909         list_for_each_safe(pos, next, &client_lru) {
1910                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1911                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1912                         t = clp->cl_time - cutoff;
1913                         if (clientid_val > t)
1914                                 clientid_val = t;
1915                         break;
1916                 }
1917                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1918                         clp->cl_clientid.cl_id);
1919                 nfsd4_remove_clid_dir(clp);
1920                 expire_client(clp);
1921         }
1922         INIT_LIST_HEAD(&reaplist);
1923         spin_lock(&recall_lock);
1924         list_for_each_safe(pos, next, &del_recall_lru) {
1925                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1926                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1927                         u = dp->dl_time - cutoff;
1928                         if (test_val > u)
1929                                 test_val = u;
1930                         break;
1931                 }
1932                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1933                                     dp, dp->dl_flock);
1934                 list_move(&dp->dl_recall_lru, &reaplist);
1935         }
1936         spin_unlock(&recall_lock);
1937         list_for_each_safe(pos, next, &reaplist) {
1938                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1939                 list_del_init(&dp->dl_recall_lru);
1940                 unhash_delegation(dp);
1941         }
1942         test_val = NFSD_LEASE_TIME;
1943         list_for_each_safe(pos, next, &close_lru) {
1944                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1945                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1946                         u = sop->so_time - cutoff;
1947                         if (test_val > u)
1948                                 test_val = u;
1949                         break;
1950                 }
1951                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1952                         sop->so_id);
1953                 list_del(&sop->so_close_lru);
1954                 nfs4_put_stateowner(sop);
1955         }
1956         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1957                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1958         nfs4_unlock_state();
1959         return clientid_val;
1960 }
1961
1962 void
1963 laundromat_main(void *not_used)
1964 {
1965         time_t t;
1966
1967         t = nfs4_laundromat();
1968         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1969         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1970 }
1971
1972 static struct nfs4_stateowner *
1973 search_close_lru(u32 st_id, int flags)
1974 {
1975         struct nfs4_stateowner *local = NULL;
1976
1977         if (flags & CLOSE_STATE) {
1978                 list_for_each_entry(local, &close_lru, so_close_lru) {
1979                         if (local->so_id == st_id)
1980                                 return local;
1981                 }
1982         }
1983         return NULL;
1984 }
1985
1986 static inline int
1987 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1988 {
1989         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1990 }
1991
1992 static int
1993 STALE_STATEID(stateid_t *stateid)
1994 {
1995         if (stateid->si_boot == boot_time)
1996                 return 0;
1997         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1998                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1999                 stateid->si_generation);
2000         return 1;
2001 }
2002
2003 static inline int
2004 access_permit_read(unsigned long access_bmap)
2005 {
2006         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2007                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2008                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2009 }
2010
2011 static inline int
2012 access_permit_write(unsigned long access_bmap)
2013 {
2014         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2015                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2016 }
2017
2018 static
2019 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2020 {
2021         int status = nfserr_openmode;
2022
2023         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2024                 goto out;
2025         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2026                 goto out;
2027         status = nfs_ok;
2028 out:
2029         return status;
2030 }
2031
2032 static inline int
2033 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2034 {
2035         /* Trying to call delegreturn with a special stateid? Yuch: */
2036         if (!(flags & (RD_STATE | WR_STATE)))
2037                 return nfserr_bad_stateid;
2038         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2039                 return nfs_ok;
2040         else if (nfs4_in_grace()) {
2041                 /* Answer in remaining cases depends on existance of
2042                  * conflicting state; so we must wait out the grace period. */
2043                 return nfserr_grace;
2044         } else if (flags & WR_STATE)
2045                 return nfs4_share_conflict(current_fh,
2046                                 NFS4_SHARE_DENY_WRITE);
2047         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2048                 return nfs4_share_conflict(current_fh,
2049                                 NFS4_SHARE_DENY_READ);
2050 }
2051
2052 /*
2053  * Allow READ/WRITE during grace period on recovered state only for files
2054  * that are not able to provide mandatory locking.
2055  */
2056 static inline int
2057 io_during_grace_disallowed(struct inode *inode, int flags)
2058 {
2059         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2060                 && MANDATORY_LOCK(inode);
2061 }
2062
2063 /*
2064 * Checks for stateid operations
2065 */
2066 int
2067 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2068 {
2069         struct nfs4_stateid *stp = NULL;
2070         struct nfs4_delegation *dp = NULL;
2071         stateid_t *stidp;
2072         struct inode *ino = current_fh->fh_dentry->d_inode;
2073         int status;
2074
2075         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2076                 stateid->si_boot, stateid->si_stateownerid, 
2077                 stateid->si_fileid, stateid->si_generation); 
2078         if (filpp)
2079                 *filpp = NULL;
2080
2081         if (io_during_grace_disallowed(ino, flags))
2082                 return nfserr_grace;
2083
2084         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2085                 return check_special_stateids(current_fh, stateid, flags);
2086
2087         /* STALE STATEID */
2088         status = nfserr_stale_stateid;
2089         if (STALE_STATEID(stateid)) 
2090                 goto out;
2091
2092         /* BAD STATEID */
2093         status = nfserr_bad_stateid;
2094         if (!stateid->si_fileid) { /* delegation stateid */
2095                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2096                         dprintk("NFSD: delegation stateid not found\n");
2097                         if (nfs4_in_grace())
2098                                 status = nfserr_grace;
2099                         goto out;
2100                 }
2101                 stidp = &dp->dl_stateid;
2102         } else { /* open or lock stateid */
2103                 if (!(stp = find_stateid(stateid, flags))) {
2104                         dprintk("NFSD: open or lock stateid not found\n");
2105                         if (nfs4_in_grace())
2106                                 status = nfserr_grace;
2107                         goto out;
2108                 }
2109                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2110                         goto out;
2111                 if (!stp->st_stateowner->so_confirmed)
2112                         goto out;
2113                 stidp = &stp->st_stateid;
2114         }
2115         if (stateid->si_generation > stidp->si_generation)
2116                 goto out;
2117
2118         /* OLD STATEID */
2119         status = nfserr_old_stateid;
2120         if (stateid->si_generation < stidp->si_generation)
2121                 goto out;
2122         if (stp) {
2123                 if ((status = nfs4_check_openmode(stp,flags)))
2124                         goto out;
2125                 renew_client(stp->st_stateowner->so_client);
2126                 if (filpp)
2127                         *filpp = stp->st_vfs_file;
2128         } else if (dp) {
2129                 if ((status = nfs4_check_delegmode(dp, flags)))
2130                         goto out;
2131                 renew_client(dp->dl_client);
2132                 if (flags & DELEG_RET)
2133                         unhash_delegation(dp);
2134                 if (filpp)
2135                         *filpp = dp->dl_vfs_file;
2136         }
2137         status = nfs_ok;
2138 out:
2139         return status;
2140 }
2141
2142 static inline int
2143 setlkflg (int type)
2144 {
2145         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2146                 RD_STATE : WR_STATE;
2147 }
2148
2149 /* 
2150  * Checks for sequence id mutating operations. 
2151  */
2152 static int
2153 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)
2154 {
2155         struct nfs4_stateid *stp;
2156         struct nfs4_stateowner *sop;
2157
2158         dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
2159                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2160                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2161                 stateid->si_generation);
2162
2163         *stpp = NULL;
2164         *sopp = NULL;
2165
2166         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2167                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2168                 return nfserr_bad_stateid;
2169         }
2170
2171         if (STALE_STATEID(stateid))
2172                 return nfserr_stale_stateid;
2173         /*
2174         * We return BAD_STATEID if filehandle doesn't match stateid, 
2175         * the confirmed flag is incorrecly set, or the generation 
2176         * number is incorrect.  
2177         */
2178         stp = find_stateid(stateid, flags);
2179         if (stp == NULL) {
2180                 /*
2181                  * Also, we should make sure this isn't just the result of
2182                  * a replayed close:
2183                  */
2184                 sop = search_close_lru(stateid->si_stateownerid, flags);
2185                 if (sop == NULL)
2186                         return nfserr_bad_stateid;
2187                 *sopp = sop;
2188                 goto check_replay;
2189         }
2190
2191         if (lock) {
2192                 struct nfs4_stateowner *sop = stp->st_stateowner;
2193                 clientid_t *lockclid = &lock->v.new.clientid;
2194                 struct nfs4_client *clp = sop->so_client;
2195                 int lkflg = 0;
2196                 int status;
2197
2198                 lkflg = setlkflg(lock->lk_type);
2199
2200                 if (lock->lk_is_new) {
2201                        if (!sop->so_is_open_owner)
2202                                return nfserr_bad_stateid;
2203                        if (!cmp_clid(&clp->cl_clientid, lockclid))
2204                                return nfserr_bad_stateid;
2205                        /* stp is the open stateid */
2206                        status = nfs4_check_openmode(stp, lkflg);
2207                        if (status)
2208                                return status;
2209                } else {
2210                        /* stp is the lock stateid */
2211                        status = nfs4_check_openmode(stp->st_openstp, lkflg);
2212                        if (status)
2213                                return status;
2214                }
2215
2216         }
2217
2218         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2219                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2220                 return nfserr_bad_stateid;
2221         }
2222
2223         *stpp = stp;
2224         *sopp = sop = stp->st_stateowner;
2225
2226         /*
2227         *  We now validate the seqid and stateid generation numbers.
2228         *  For the moment, we ignore the possibility of 
2229         *  generation number wraparound.
2230         */
2231         if (seqid != sop->so_seqid)
2232                 goto check_replay;
2233
2234         if (sop->so_confirmed && flags & CONFIRM) {
2235                 printk("NFSD: preprocess_seqid_op: expected"
2236                                 " unconfirmed stateowner!\n");
2237                 return nfserr_bad_stateid;
2238         }
2239         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2240                 printk("NFSD: preprocess_seqid_op: stateowner not"
2241                                 " confirmed yet!\n");
2242                 return nfserr_bad_stateid;
2243         }
2244         if (stateid->si_generation > stp->st_stateid.si_generation) {
2245                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2246                 return nfserr_bad_stateid;
2247         }
2248
2249         if (stateid->si_generation < stp->st_stateid.si_generation) {
2250                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2251                 return nfserr_old_stateid;
2252         }
2253         renew_client(sop->so_client);
2254         return nfs_ok;
2255
2256 check_replay:
2257         if (seqid == sop->so_seqid - 1) {
2258                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2259                 /* indicate replay to calling function */
2260                 return NFSERR_REPLAY_ME;
2261         }
2262         printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2263                         sop->so_seqid, seqid);
2264         *sopp = NULL;
2265         return nfserr_bad_seqid;
2266 }
2267
2268 int
2269 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner)
2270 {
2271         int status;
2272         struct nfs4_stateowner *sop;
2273         struct nfs4_stateid *stp;
2274
2275         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2276                         (int)current_fh->fh_dentry->d_name.len,
2277                         current_fh->fh_dentry->d_name.name);
2278
2279         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2280                 goto out;
2281
2282         nfs4_lock_state();
2283
2284         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2285                                         &oc->oc_req_stateid,
2286                                         CHECK_FH | CONFIRM | OPEN_STATE,
2287                                         &oc->oc_stateowner, &stp, NULL)))
2288                 goto out; 
2289
2290         sop = oc->oc_stateowner;
2291         sop->so_confirmed = 1;
2292         update_stateid(&stp->st_stateid);
2293         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2294         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
2295                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2296                          stp->st_stateid.si_boot,
2297                          stp->st_stateid.si_stateownerid,
2298                          stp->st_stateid.si_fileid,
2299                          stp->st_stateid.si_generation);
2300
2301         nfsd4_create_clid_dir(sop->so_client);
2302 out:
2303         if (oc->oc_stateowner) {
2304                 nfs4_get_stateowner(oc->oc_stateowner);
2305                 *replay_owner = oc->oc_stateowner;
2306         }
2307         nfs4_unlock_state();
2308         return status;
2309 }
2310
2311
2312 /*
2313  * unset all bits in union bitmap (bmap) that
2314  * do not exist in share (from successful OPEN_DOWNGRADE)
2315  */
2316 static void
2317 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2318 {
2319         int i;
2320         for (i = 1; i < 4; i++) {
2321                 if ((i & access) != i)
2322                         __clear_bit(i, bmap);
2323         }
2324 }
2325
2326 static void
2327 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2328 {
2329         int i;
2330         for (i = 0; i < 4; i++) {
2331                 if ((i & deny) != i)
2332                         __clear_bit(i, bmap);
2333         }
2334 }
2335
2336 int
2337 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner)
2338 {
2339         int status;
2340         struct nfs4_stateid *stp;
2341         unsigned int share_access;
2342
2343         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
2344                         (int)current_fh->fh_dentry->d_name.len,
2345                         current_fh->fh_dentry->d_name.name);
2346
2347         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2348                 return nfserr_inval;
2349
2350         nfs4_lock_state();
2351         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
2352                                         &od->od_stateid, 
2353                                         CHECK_FH | OPEN_STATE, 
2354                                         &od->od_stateowner, &stp, NULL)))
2355                 goto out; 
2356
2357         status = nfserr_inval;
2358         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2359                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2360                         stp->st_access_bmap, od->od_share_access);
2361                 goto out;
2362         }
2363         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2364                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2365                         stp->st_deny_bmap, od->od_share_deny);
2366                 goto out;
2367         }
2368         set_access(&share_access, stp->st_access_bmap);
2369         nfs4_file_downgrade(stp->st_vfs_file,
2370                             share_access & ~od->od_share_access);
2371
2372         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2373         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2374
2375         update_stateid(&stp->st_stateid);
2376         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2377         status = nfs_ok;
2378 out:
2379         if (od->od_stateowner) {
2380                 nfs4_get_stateowner(od->od_stateowner);
2381                 *replay_owner = od->od_stateowner;
2382         }
2383         nfs4_unlock_state();
2384         return status;
2385 }
2386
2387 /*
2388  * nfs4_unlock_state() called after encode
2389  */
2390 int
2391 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner)
2392 {
2393         int status;
2394         struct nfs4_stateid *stp;
2395
2396         dprintk("NFSD: nfsd4_close on file %.*s\n", 
2397                         (int)current_fh->fh_dentry->d_name.len,
2398                         current_fh->fh_dentry->d_name.name);
2399
2400         nfs4_lock_state();
2401         /* check close_lru for replay */
2402         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
2403                                         &close->cl_stateid, 
2404                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2405                                         &close->cl_stateowner, &stp, NULL)))
2406                 goto out; 
2407         status = nfs_ok;
2408         update_stateid(&stp->st_stateid);
2409         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2410
2411         /* release_stateid() calls nfsd_close() if needed */
2412         release_stateid(stp, OPEN_STATE);
2413
2414         /* place unused nfs4_stateowners on so_close_lru list to be
2415          * released by the laundromat service after the lease period
2416          * to enable us to handle CLOSE replay
2417          */
2418         if (list_empty(&close->cl_stateowner->so_stateids))
2419                 move_to_close_lru(close->cl_stateowner);
2420 out:
2421         if (close->cl_stateowner) {
2422                 nfs4_get_stateowner(close->cl_stateowner);
2423                 *replay_owner = close->cl_stateowner;
2424         }
2425         nfs4_unlock_state();
2426         return status;
2427 }
2428
2429 int
2430 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2431 {
2432         int status;
2433
2434         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2435                 goto out;
2436
2437         nfs4_lock_state();
2438         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2439         nfs4_unlock_state();
2440 out:
2441         return status;
2442 }
2443
2444
2445 /* 
2446  * Lock owner state (byte-range locks)
2447  */
2448 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2449 #define LOCK_HASH_BITS              8
2450 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2451 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2452
2453 #define lockownerid_hashval(id) \
2454         ((id) & LOCK_HASH_MASK)
2455
2456 static inline unsigned int
2457 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2458                 struct xdr_netobj *ownername)
2459 {
2460         return (file_hashval(inode) + cl_id
2461                         + opaque_hashval(ownername->data, ownername->len))
2462                 & LOCK_HASH_MASK;
2463 }
2464
2465 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2466 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2467 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2468
2469 static struct nfs4_stateid *
2470 find_stateid(stateid_t *stid, int flags)
2471 {
2472         struct nfs4_stateid *local = NULL;
2473         u32 st_id = stid->si_stateownerid;
2474         u32 f_id = stid->si_fileid;
2475         unsigned int hashval;
2476
2477         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2478         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2479                 hashval = stateid_hashval(st_id, f_id);
2480                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2481                         if ((local->st_stateid.si_stateownerid == st_id) &&
2482                             (local->st_stateid.si_fileid == f_id))
2483                                 return local;
2484                 }
2485         } 
2486         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2487                 hashval = stateid_hashval(st_id, f_id);
2488                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2489                         if ((local->st_stateid.si_stateownerid == st_id) &&
2490                             (local->st_stateid.si_fileid == f_id))
2491                                 return local;
2492                 }
2493         }
2494         return NULL;
2495 }
2496
2497 static struct nfs4_delegation *
2498 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2499 {
2500         struct nfs4_file *fp;
2501         struct nfs4_delegation *dl;
2502
2503         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2504                     stid->si_boot, stid->si_stateownerid,
2505                     stid->si_fileid, stid->si_generation);
2506
2507         fp = find_file(ino);
2508         if (!fp)
2509                 return NULL;
2510         dl = find_delegation_file(fp, stid);
2511         put_nfs4_file(fp);
2512         return dl;
2513 }
2514
2515 /*
2516  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2517  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2518  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2519  * locking, this prevents us from being completely protocol-compliant.  The
2520  * real solution to this problem is to start using unsigned file offsets in
2521  * the VFS, but this is a very deep change!
2522  */
2523 static inline void
2524 nfs4_transform_lock_offset(struct file_lock *lock)
2525 {
2526         if (lock->fl_start < 0)
2527                 lock->fl_start = OFFSET_MAX;
2528         if (lock->fl_end < 0)
2529                 lock->fl_end = OFFSET_MAX;
2530 }
2531
2532 static int
2533 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2534 {
2535         struct nfs4_stateowner *local = NULL;
2536         int status = 0;
2537                                 
2538         if (hashval >= LOCK_HASH_SIZE)
2539                 goto out;
2540         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2541                 if (local == sop) {
2542                         status = 1;
2543                         goto out;
2544                 }
2545         }
2546 out:
2547         return status;
2548 }
2549
2550
2551 static inline void
2552 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2553 {
2554         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2555         unsigned int hval = lockownerid_hashval(sop->so_id);
2556
2557         deny->ld_sop = NULL;
2558         if (nfs4_verify_lock_stateowner(sop, hval)) {
2559                 kref_get(&sop->so_ref);
2560                 deny->ld_sop = sop;
2561                 deny->ld_clientid = sop->so_client->cl_clientid;
2562         }
2563         deny->ld_start = fl->fl_start;
2564         deny->ld_length = ~(u64)0;
2565         if (fl->fl_end != ~(u64)0)
2566                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
2567         deny->ld_type = NFS4_READ_LT;
2568         if (fl->fl_type != F_RDLCK)
2569                 deny->ld_type = NFS4_WRITE_LT;
2570 }
2571
2572 static struct nfs4_stateowner *
2573 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2574                 struct xdr_netobj *owner)
2575 {
2576         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2577         struct nfs4_stateowner *op;
2578
2579         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2580                 if (cmp_owner_str(op, owner, clid))
2581                         return op;
2582         }
2583         return NULL;
2584 }
2585
2586 /*
2587  * Alloc a lock owner structure.
2588  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
2589  * occured. 
2590  *
2591  * strhashval = lock_ownerstr_hashval 
2592  */
2593
2594 static struct nfs4_stateowner *
2595 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2596         struct nfs4_stateowner *sop;
2597         struct nfs4_replay *rp;
2598         unsigned int idhashval;
2599
2600         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2601                 return NULL;
2602         idhashval = lockownerid_hashval(current_ownerid);
2603         INIT_LIST_HEAD(&sop->so_idhash);
2604         INIT_LIST_HEAD(&sop->so_strhash);
2605         INIT_LIST_HEAD(&sop->so_perclient);
2606         INIT_LIST_HEAD(&sop->so_stateids);
2607         INIT_LIST_HEAD(&sop->so_perstateid);
2608         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2609         sop->so_time = 0;
2610         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2611         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2612         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2613         sop->so_is_open_owner = 0;
2614         sop->so_id = current_ownerid++;
2615         sop->so_client = clp;
2616         /* It is the openowner seqid that will be incremented in encode in the
2617          * case of new lockowners; so increment the lock seqid manually: */
2618         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2619         sop->so_confirmed = 1;
2620         rp = &sop->so_replay;
2621         rp->rp_status = NFSERR_SERVERFAULT;
2622         rp->rp_buflen = 0;
2623         rp->rp_buf = rp->rp_ibuf;
2624         return sop;
2625 }
2626
2627 static struct nfs4_stateid *
2628 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2629 {
2630         struct nfs4_stateid *stp;
2631         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2632
2633         stp = nfs4_alloc_stateid();
2634         if (stp == NULL)
2635                 goto out;
2636         INIT_LIST_HEAD(&stp->st_hash);
2637         INIT_LIST_HEAD(&stp->st_perfile);
2638         INIT_LIST_HEAD(&stp->st_perstateowner);
2639         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2640         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2641         list_add(&stp->st_perfile, &fp->fi_stateids);
2642         list_add(&stp->st_perstateowner, &sop->so_stateids);
2643         stp->st_stateowner = sop;
2644         get_nfs4_file(fp);
2645         stp->st_file = fp;
2646         stp->st_stateid.si_boot = boot_time;
2647         stp->st_stateid.si_stateownerid = sop->so_id;
2648         stp->st_stateid.si_fileid = fp->fi_id;
2649         stp->st_stateid.si_generation = 0;
2650         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2651         stp->st_access_bmap = open_stp->st_access_bmap;
2652         stp->st_deny_bmap = open_stp->st_deny_bmap;
2653         stp->st_openstp = open_stp;
2654
2655 out:
2656         return stp;
2657 }
2658
2659 static int
2660 check_lock_length(u64 offset, u64 length)
2661 {
2662         return ((length == 0)  || ((length != ~(u64)0) &&
2663              LOFF_OVERFLOW(offset, length)));
2664 }
2665
2666 /*
2667  *  LOCK operation 
2668  */
2669 int
2670 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
2671 {
2672         struct nfs4_stateowner *open_sop = NULL;
2673         struct nfs4_stateowner *lock_sop = NULL;
2674         struct nfs4_stateid *lock_stp;
2675         struct file *filp;
2676         struct file_lock file_lock;
2677         struct file_lock *conflock;
2678         int status = 0;
2679         unsigned int strhashval;
2680
2681         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2682                 (long long) lock->lk_offset,
2683                 (long long) lock->lk_length);
2684
2685         if (check_lock_length(lock->lk_offset, lock->lk_length))
2686                  return nfserr_inval;
2687
2688         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2689                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2690                 return status;
2691         }
2692
2693         nfs4_lock_state();
2694
2695         if (lock->lk_is_new) {
2696                 /*
2697                  * Client indicates that this is a new lockowner.
2698                  * Use open owner and open stateid to create lock owner and
2699                  * lock stateid.
2700                  */
2701                 struct nfs4_stateid *open_stp = NULL;
2702                 struct nfs4_file *fp;
2703                 
2704                 status = nfserr_stale_clientid;
2705                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2706                         goto out;
2707
2708                 /* validate and update open stateid and open seqid */
2709                 status = nfs4_preprocess_seqid_op(current_fh, 
2710                                         lock->lk_new_open_seqid,
2711                                         &lock->lk_new_open_stateid,
2712                                         CHECK_FH | OPEN_STATE,
2713                                         &lock->lk_replay_owner, &open_stp,
2714                                         lock);
2715                 if (status)
2716                         goto out;
2717                 open_sop = lock->lk_replay_owner;
2718                 /* create lockowner and lock stateid */
2719                 fp = open_stp->st_file;
2720                 strhashval = lock_ownerstr_hashval(fp->fi_inode, 
2721                                 open_sop->so_client->cl_clientid.cl_id, 
2722                                 &lock->v.new.owner);
2723                 /* XXX: Do we need to check for duplicate stateowners on
2724                  * the same file, or should they just be allowed (and
2725                  * create new stateids)? */
2726                 status = nfserr_resource;
2727                 lock_sop = alloc_init_lock_stateowner(strhashval,
2728                                 open_sop->so_client, open_stp, lock);
2729                 if (lock_sop == NULL)
2730                         goto out;
2731                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2732                 if (lock_stp == NULL)
2733                         goto out;
2734         } else {
2735                 /* lock (lock owner + lock stateid) already exists */
2736                 status = nfs4_preprocess_seqid_op(current_fh,
2737                                        lock->lk_old_lock_seqid, 
2738                                        &lock->lk_old_lock_stateid, 
2739                                        CHECK_FH | LOCK_STATE, 
2740                                        &lock->lk_replay_owner, &lock_stp, lock);
2741                 if (status)
2742                         goto out;
2743                 lock_sop = lock->lk_replay_owner;
2744         }
2745         /* lock->lk_replay_owner and lock_stp have been created or found */
2746         filp = lock_stp->st_vfs_file;
2747
2748         status = nfserr_grace;
2749         if (nfs4_in_grace() && !lock->lk_reclaim)
2750                 goto out;
2751         status = nfserr_no_grace;
2752         if (!nfs4_in_grace() && lock->lk_reclaim)
2753                 goto out;
2754
2755         locks_init_lock(&file_lock);
2756         switch (lock->lk_type) {
2757                 case NFS4_READ_LT:
2758                 case NFS4_READW_LT:
2759                         file_lock.fl_type = F_RDLCK;
2760                 break;
2761                 case NFS4_WRITE_LT:
2762                 case NFS4_WRITEW_LT:
2763                         file_lock.fl_type = F_WRLCK;
2764                 break;
2765                 default:
2766                         status = nfserr_inval;
2767                 goto out;
2768         }
2769         file_lock.fl_owner = (fl_owner_t)lock_sop;
2770         file_lock.fl_pid = current->tgid;
2771         file_lock.fl_file = filp;
2772         file_lock.fl_flags = FL_POSIX;
2773
2774         file_lock.fl_start = lock->lk_offset;
2775         if ((lock->lk_length == ~(u64)0) || 
2776                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2777                 file_lock.fl_end = ~(u64)0;
2778         else
2779                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2780         nfs4_transform_lock_offset(&file_lock);
2781
2782         /*
2783         * Try to lock the file in the VFS.
2784         * Note: locks.c uses the BKL to protect the inode's lock list.
2785         */
2786
2787         status = posix_lock_file(filp, &file_lock);
2788         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2789         switch (-status) {
2790         case 0: /* success! */
2791                 update_stateid(&lock_stp->st_stateid);
2792                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
2793                                 sizeof(stateid_t));
2794                 goto out;
2795         case (EAGAIN):
2796                 goto conflicting_lock;
2797         case (EDEADLK):
2798                 status = nfserr_deadlock;
2799         default:        
2800                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2801                 goto out;
2802         }
2803
2804 conflicting_lock:
2805         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2806         status = nfserr_denied;
2807         /* XXX There is a race here. Future patch needed to provide 
2808          * an atomic posix_lock_and_test_file
2809          */
2810         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2811                 status = nfserr_serverfault;
2812                 goto out;
2813         }
2814         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2815 out:
2816         if (status && lock->lk_is_new && lock_sop)
2817                 release_stateowner(lock_sop);
2818         if (lock->lk_replay_owner) {
2819                 nfs4_get_stateowner(lock->lk_replay_owner);
2820                 *replay_owner = lock->lk_replay_owner;
2821         }
2822         nfs4_unlock_state();
2823         return status;
2824 }
2825
2826 /*
2827  * LOCKT operation
2828  */
2829 int
2830 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2831 {
2832         struct inode *inode;
2833         struct file file;
2834         struct file_lock file_lock;
2835         struct file_lock *conflicting_lock;
2836         int status;
2837
2838         if (nfs4_in_grace())
2839                 return nfserr_grace;
2840
2841         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2842                  return nfserr_inval;
2843
2844         lockt->lt_stateowner = NULL;
2845         nfs4_lock_state();
2846
2847         status = nfserr_stale_clientid;
2848         if (STALE_CLIENTID(&lockt->lt_clientid))
2849                 goto out;
2850
2851         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2852                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2853                 if (status == nfserr_symlink)
2854                         status = nfserr_inval;
2855                 goto out;
2856         }
2857
2858         inode = current_fh->fh_dentry->d_inode;
2859         locks_init_lock(&file_lock);
2860         switch (lockt->lt_type) {
2861                 case NFS4_READ_LT:
2862                 case NFS4_READW_LT:
2863                         file_lock.fl_type = F_RDLCK;
2864                 break;
2865                 case NFS4_WRITE_LT:
2866                 case NFS4_WRITEW_LT:
2867                         file_lock.fl_type = F_WRLCK;
2868                 break;
2869                 default:
2870                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2871                         status = nfserr_inval;
2872                 goto out;
2873         }
2874
2875         lockt->lt_stateowner = find_lockstateowner_str(inode,
2876                         &lockt->lt_clientid, &lockt->lt_owner);
2877         if (lockt->lt_stateowner)
2878                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2879         file_lock.fl_pid = current->tgid;
2880         file_lock.fl_flags = FL_POSIX;
2881
2882         file_lock.fl_start = lockt->lt_offset;
2883         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2884                 file_lock.fl_end = ~(u64)0;
2885         else
2886                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2887
2888         nfs4_transform_lock_offset(&file_lock);
2889
2890         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2891          * since LOCKT doesn't require an OPEN, and therefore a struct
2892          * file may not exist, pass posix_test_lock a struct file with
2893          * only the dentry:inode set.
2894          */
2895         memset(&file, 0, sizeof (struct file));
2896         file.f_dentry = current_fh->fh_dentry;
2897
2898         status = nfs_ok;
2899         conflicting_lock = posix_test_lock(&file, &file_lock);
2900         if (conflicting_lock) {
2901                 status = nfserr_denied;
2902                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2903         }
2904 out:
2905         nfs4_unlock_state();
2906         return status;
2907 }
2908
2909 int
2910 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner)
2911 {
2912         struct nfs4_stateid *stp;
2913         struct file *filp = NULL;
2914         struct file_lock file_lock;
2915         int status;
2916                                                         
2917         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2918                 (long long) locku->lu_offset,
2919                 (long long) locku->lu_length);
2920
2921         if (check_lock_length(locku->lu_offset, locku->lu_length))
2922                  return nfserr_inval;
2923
2924         nfs4_lock_state();
2925                                                                                 
2926         if ((status = nfs4_preprocess_seqid_op(current_fh, 
2927                                         locku->lu_seqid, 
2928                                         &locku->lu_stateid, 
2929                                         CHECK_FH | LOCK_STATE, 
2930                                         &locku->lu_stateowner, &stp, NULL)))
2931                 goto out;
2932
2933         filp = stp->st_vfs_file;
2934         BUG_ON(!filp);
2935         locks_init_lock(&file_lock);
2936         file_lock.fl_type = F_UNLCK;
2937         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2938         file_lock.fl_pid = current->tgid;
2939         file_lock.fl_file = filp;
2940         file_lock.fl_flags = FL_POSIX; 
2941         file_lock.fl_start = locku->lu_offset;
2942
2943         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2944                 file_lock.fl_end = ~(u64)0;
2945         else
2946                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2947         nfs4_transform_lock_offset(&file_lock);
2948
2949         /*
2950         *  Try to unlock the file in the VFS.
2951         */
2952         status = posix_lock_file(filp, &file_lock); 
2953         if (status) {
2954                 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2955                 goto out_nfserr;
2956         }
2957         /*
2958         * OK, unlock succeeded; the only thing left to do is update the stateid.
2959         */
2960         update_stateid(&stp->st_stateid);
2961         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2962
2963 out:
2964         if (locku->lu_stateowner) {
2965                 nfs4_get_stateowner(locku->lu_stateowner);
2966                 *replay_owner = locku->lu_stateowner;
2967         }
2968         nfs4_unlock_state();
2969         return status;
2970
2971 out_nfserr:
2972         status = nfserrno(status);
2973         goto out;
2974 }
2975
2976 /*
2977  * returns
2978  *      1: locks held by lockowner
2979  *      0: no locks held by lockowner
2980  */
2981 static int
2982 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2983 {
2984         struct file_lock **flpp;
2985         struct inode *inode = filp->f_dentry->d_inode;
2986         int status = 0;
2987
2988         lock_kernel();
2989         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2990                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2991                         status = 1;
2992                         goto out;
2993                 }
2994         }
2995 out:
2996         unlock_kernel();
2997         return status;
2998 }
2999
3000 int
3001 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3002 {
3003         clientid_t *clid = &rlockowner->rl_clientid;
3004         struct nfs4_stateowner *sop;
3005         struct nfs4_stateid *stp;
3006         struct xdr_netobj *owner = &rlockowner->rl_owner;
3007         struct list_head matches;
3008         int i;
3009         int status;
3010
3011         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3012                 clid->cl_boot, clid->cl_id);
3013
3014         /* XXX check for lease expiration */
3015
3016         status = nfserr_stale_clientid;
3017         if (STALE_CLIENTID(clid))
3018                 return status;
3019
3020         nfs4_lock_state();
3021
3022         status = nfserr_locks_held;
3023         /* XXX: we're doing a linear search through all the lockowners.
3024          * Yipes!  For now we'll just hope clients aren't really using
3025          * release_lockowner much, but eventually we have to fix these
3026          * data structures. */
3027         INIT_LIST_HEAD(&matches);
3028         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3029                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3030                         if (!cmp_owner_str(sop, owner, clid))
3031                                 continue;
3032                         list_for_each_entry(stp, &sop->so_stateids,
3033                                         st_perstateowner) {
3034                                 if (check_for_locks(stp->st_vfs_file, sop))
3035                                         goto out;
3036                                 /* Note: so_perclient unused for lockowners,
3037                                  * so it's OK to fool with here. */
3038                                 list_add(&sop->so_perclient, &matches);
3039                         }
3040                 }
3041         }
3042         /* Clients probably won't expect us to return with some (but not all)
3043          * of the lockowner state released; so don't release any until all
3044          * have been checked. */
3045         status = nfs_ok;
3046         while (!list_empty(&matches)) {
3047                 sop = list_entry(matches.next, struct nfs4_stateowner,
3048                                                                 so_perclient);
3049                 /* unhash_stateowner deletes so_perclient only
3050                  * for openowners. */
3051                 list_del(&sop->so_perclient);
3052                 release_stateowner(sop);
3053         }
3054 out:
3055         nfs4_unlock_state();
3056         return status;
3057 }
3058
3059 static inline struct nfs4_client_reclaim *
3060 alloc_reclaim(void)
3061 {
3062         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3063 }
3064
3065 int
3066 nfs4_has_reclaimed_state(const char *name)
3067 {
3068         unsigned int strhashval = clientstr_hashval(name);
3069         struct nfs4_client *clp;
3070
3071         clp = find_confirmed_client_by_str(name, strhashval);
3072         return clp ? 1 : 0;
3073 }
3074
3075 /*
3076  * failure => all reset bets are off, nfserr_no_grace...
3077  */
3078 int
3079 nfs4_client_to_reclaim(const char *name)
3080 {
3081         unsigned int strhashval;
3082         struct nfs4_client_reclaim *crp = NULL;
3083
3084         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3085         crp = alloc_reclaim();
3086         if (!crp)
3087                 return 0;
3088         strhashval = clientstr_hashval(name);
3089         INIT_LIST_HEAD(&crp->cr_strhash);
3090         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3091         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3092         reclaim_str_hashtbl_size++;
3093         return 1;
3094 }
3095
3096 static void
3097 nfs4_release_reclaim(void)
3098 {
3099         struct nfs4_client_reclaim *crp = NULL;
3100         int i;
3101
3102         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3103                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3104                         crp = list_entry(reclaim_str_hashtbl[i].next,
3105                                         struct nfs4_client_reclaim, cr_strhash);
3106                         list_del(&crp->cr_strhash);
3107                         kfree(crp);
3108                         reclaim_str_hashtbl_size--;
3109                 }
3110         }
3111         BUG_ON(reclaim_str_hashtbl_size);
3112 }
3113
3114 /*
3115  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3116 static struct nfs4_client_reclaim *
3117 nfs4_find_reclaim_client(clientid_t *clid)
3118 {
3119         unsigned int strhashval;
3120         struct nfs4_client *clp;
3121         struct nfs4_client_reclaim *crp = NULL;
3122
3123
3124         /* find clientid in conf_id_hashtbl */
3125         clp = find_confirmed_client(clid);
3126         if (clp == NULL)
3127                 return NULL;
3128
3129         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3130                             clp->cl_name.len, clp->cl_name.data,
3131                             clp->cl_recdir);
3132
3133         /* find clp->cl_name in reclaim_str_hashtbl */
3134         strhashval = clientstr_hashval(clp->cl_recdir);
3135         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3136                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3137                         return crp;
3138                 }
3139         }
3140         return NULL;
3141 }
3142
3143 /*
3144 * Called from OPEN. Look for clientid in reclaim list.
3145 */
3146 int
3147 nfs4_check_open_reclaim(clientid_t *clid)
3148 {
3149         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3150 }
3151
3152 /* initialization to perform at module load time: */
3153
3154 void
3155 nfs4_state_init(void)
3156 {
3157         int i;
3158
3159         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3160                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3161                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3162                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3163                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3164         }
3165         for (i = 0; i < FILE_HASH_SIZE; i++) {
3166                 INIT_LIST_HEAD(&file_hashtbl[i]);
3167         }
3168         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3169                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3170                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3171         }
3172         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3173                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3174                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3175         }
3176         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3177                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3178                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3179         }
3180         memset(&onestateid, ~0, sizeof(stateid_t));
3181         INIT_LIST_HEAD(&close_lru);
3182         INIT_LIST_HEAD(&client_lru);
3183         INIT_LIST_HEAD(&del_recall_lru);
3184         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3185                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3186         reclaim_str_hashtbl_size = 0;
3187 }
3188
3189 static void
3190 nfsd4_load_reboot_recovery_data(void)
3191 {
3192         int status;
3193
3194         nfs4_lock_state();
3195         nfsd4_init_recdir(user_recovery_dirname);
3196         status = nfsd4_recdir_load();
3197         nfs4_unlock_state();
3198         if (status)
3199                 printk("NFSD: Failure reading reboot recovery data\n");
3200 }
3201
3202 /* initialization to perform when the nfsd service is started: */
3203
3204 static void
3205 __nfs4_state_start(void)
3206 {
3207         time_t grace_time;
3208
3209         boot_time = get_seconds();
3210         grace_time = max(user_lease_time, lease_time);
3211         lease_time = user_lease_time;
3212         in_grace = 1;
3213         printk("NFSD: starting %ld-second grace period\n", grace_time);
3214         laundry_wq = create_singlethread_workqueue("nfsd4");
3215         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3216 }
3217
3218 int
3219 nfs4_state_start(void)
3220 {
3221         int status;
3222
3223         if (nfs4_init)
3224                 return 0;
3225         status = nfsd4_init_slabs();
3226         if (status)
3227                 return status;
3228         nfsd4_load_reboot_recovery_data();
3229         __nfs4_state_start();
3230         nfs4_init = 1;
3231         return 0;
3232 }
3233
3234 int
3235 nfs4_in_grace(void)
3236 {
3237         return in_grace;
3238 }
3239
3240 time_t
3241 nfs4_lease_time(void)
3242 {
3243         return lease_time;
3244 }
3245
3246 static void
3247 __nfs4_state_shutdown(void)
3248 {
3249         int i;
3250         struct nfs4_client *clp = NULL;
3251         struct nfs4_delegation *dp = NULL;
3252         struct nfs4_stateowner *sop = NULL;
3253         struct list_head *pos, *next, reaplist;
3254
3255         list_for_each_safe(pos, next, &close_lru) {
3256                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3257                 list_del(&sop->so_close_lru);
3258                 nfs4_put_stateowner(sop);
3259         }
3260
3261         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3262                 while (!list_empty(&conf_id_hashtbl[i])) {
3263                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3264                         expire_client(clp);
3265                 }
3266                 while (!list_empty(&unconf_str_hashtbl[i])) {
3267                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3268                         expire_client(clp);
3269                 }
3270         }
3271         INIT_LIST_HEAD(&reaplist);
3272         spin_lock(&recall_lock);
3273         list_for_each_safe(pos, next, &del_recall_lru) {
3274                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3275                 list_move(&dp->dl_recall_lru, &reaplist);
3276         }
3277         spin_unlock(&recall_lock);
3278         list_for_each_safe(pos, next, &reaplist) {
3279                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3280                 list_del_init(&dp->dl_recall_lru);
3281                 unhash_delegation(dp);
3282         }
3283
3284         cancel_delayed_work(&laundromat_work);
3285         flush_workqueue(laundry_wq);
3286         destroy_workqueue(laundry_wq);
3287         nfsd4_shutdown_recdir();
3288         nfs4_init = 0;
3289 }
3290
3291 void
3292 nfs4_state_shutdown(void)
3293 {
3294         nfs4_lock_state();
3295         nfs4_release_reclaim();
3296         __nfs4_state_shutdown();
3297         nfsd4_free_slabs();
3298         nfs4_unlock_state();
3299 }
3300
3301 static void
3302 nfs4_set_recdir(char *recdir)
3303 {
3304         nfs4_lock_state();
3305         strcpy(user_recovery_dirname, recdir);
3306         nfs4_unlock_state();
3307 }
3308
3309 /*
3310  * Change the NFSv4 recovery directory to recdir.
3311  */
3312 int
3313 nfs4_reset_recoverydir(char *recdir)
3314 {
3315         int status;
3316         struct nameidata nd;
3317
3318         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3319         if (status)
3320                 return status;
3321         status = -ENOTDIR;
3322         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3323                 nfs4_set_recdir(recdir);
3324                 status = 0;
3325         }
3326         path_release(&nd);
3327         return status;
3328 }
3329
3330 /*
3331  * Called when leasetime is changed.
3332  *
3333  * The only way the protocol gives us to handle on-the-fly lease changes is to
3334  * simulate a reboot.  Instead of doing that, we just wait till the next time
3335  * we start to register any changes in lease time.  If the administrator
3336  * really wants to change the lease time *now*, they can go ahead and bring
3337  * nfsd down and then back up again after changing the lease time.
3338  */
3339 void
3340 nfs4_reset_lease(time_t leasetime)
3341 {
3342         lock_kernel();
3343         user_lease_time = leasetime;
3344         unlock_kernel();
3345 }