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