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Root/fs/nfsd/nfs4state.c

1	/*
2	* Copyright (c) 2001 The Regents of the University of Michigan.
3	* All rights reserved.
4	*
5	* Kendrick Smith <kmsmith@umich.edu>
6	* Andy Adamson <kandros@umich.edu>
7	*
8	* Redistribution and use in source and binary forms, with or without
9	* modification, are permitted provided that the following conditions
10	* are met:
11	*
12	* 1. Redistributions of source code must retain the above copyright
13	* notice, this list of conditions and the following disclaimer.
14	* 2. Redistributions in binary form must reproduce the above copyright
15	* notice, this list of conditions and the following disclaimer in the
16	* documentation and/or other materials provided with the distribution.
17	* 3. Neither the name of the University nor the names of its
18	* contributors may be used to endorse or promote products derived
19	* from this software without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32	*
33	*/
34
35	#include <linux/file.h>
36	#include <linux/fs.h>
37	#include <linux/slab.h>
38	#include <linux/namei.h>
39	#include <linux/swap.h>
40	#include <linux/sunrpc/svcauth_gss.h>
41	#include <linux/sunrpc/clnt.h>
42	#include "xdr4.h"
43	#include "vfs.h"
44
45	#define NFSDDBG_FACILITY NFSDDBG_PROC
46
47	/* Globals */
48	time_t nfsd4_lease = 90; /* default lease time */
49	time_t nfsd4_grace = 90;
50	static time_t boot_time;
51	static u32 current_ownerid = 1;
52	static u32 current_fileid = 1;
53	static u32 current_delegid = 1;
54	static stateid_t zerostateid; /* bits all 0 */
55	static stateid_t onestateid; /* bits all 1 */
56	static u64 current_sessionid = 1;
57
58	#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
59	#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
60
61	/* forward declarations */
62	static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
63	static struct nfs4_delegation * find_delegation_stateid(struct inode ino, stateid_t stid);
64	static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
65	static void nfs4_set_recdir(char *recdir);
66
67	/* Locking: */
68
69	/* Currently used for almost all code touching nfsv4 state: */
70	static DEFINE_MUTEX(client_mutex);
71
72	/*
73	* Currently used for the del_recall_lru and file hash table. In an
74	* effort to decrease the scope of the client_mutex, this spinlock may
75	* eventually cover more:
76	*/
77	static DEFINE_SPINLOCK(recall_lock);
78
79	static struct kmem_cache *stateowner_slab = NULL;
80	static struct kmem_cache *file_slab = NULL;
81	static struct kmem_cache *stateid_slab = NULL;
82	static struct kmem_cache *deleg_slab = NULL;
83
84	void
85	nfs4_lock_state(void)
86	{
87	mutex_lock(&client_mutex);
88	}
89
90	void
91	nfs4_unlock_state(void)
92	{
93	mutex_unlock(&client_mutex);
94	}
95
96	static inline u32
97	opaque_hashval(const void *ptr, int nbytes)
98	{
99	unsigned char cptr = (unsigned char ) ptr;
100
101	u32 x = 0;
102	while (nbytes--) {
103	x *= 37;
104	x += *cptr++;
105	}
106	return x;
107	}
108
109	static struct list_head del_recall_lru;
110
111	static inline void
112	put_nfs4_file(struct nfs4_file *fi)
113	{
114	if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
115	list_del(&fi->fi_hash);
116	spin_unlock(&recall_lock);
117	iput(fi->fi_inode);
118	kmem_cache_free(file_slab, fi);
119	}
120	}
121
122	static inline void
123	get_nfs4_file(struct nfs4_file *fi)
124	{
125	atomic_inc(&fi->fi_ref);
126	}
127
128	static int num_delegations;
129	unsigned int max_delegations;
130
131	/*
132	* Open owner state (share locks)
133	*/
134
135	/* hash tables for nfs4_stateowner */
136	#define OWNER_HASH_BITS 8
137	#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
138	#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
139
140	#define ownerid_hashval(id) \
141	((id) & OWNER_HASH_MASK)
142	#define ownerstr_hashval(clientid, ownername) \
143	(((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
144
145	static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
146	static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
147
148	/* hash table for nfs4_file */
149	#define FILE_HASH_BITS 8
150	#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
151
152	/* hash table for (open)nfs4_stateid */
153	#define STATEID_HASH_BITS 10
154	#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
155	#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
156
157	#define file_hashval(x) \
158	hash_ptr(x, FILE_HASH_BITS)
159	#define stateid_hashval(owner_id, file_id) \
160	(((owner_id) + (file_id)) & STATEID_HASH_MASK)
161
162	static struct list_head file_hashtbl[FILE_HASH_SIZE];
163	static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
164
165	static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
166	{
167	BUG_ON(!(fp->fi_fds[oflag] \|\| fp->fi_fds[O_RDWR]));
168	atomic_inc(&fp->fi_access[oflag]);
169	}
170
171	static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
172	{
173	if (oflag == O_RDWR) {
174	__nfs4_file_get_access(fp, O_RDONLY);
175	__nfs4_file_get_access(fp, O_WRONLY);
176	} else
177	__nfs4_file_get_access(fp, oflag);
178	}
179
180	static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
181	{
182	if (fp->fi_fds[oflag]) {
183	fput(fp->fi_fds[oflag]);
184	fp->fi_fds[oflag] = NULL;
185	}
186	}
187
188	static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
189	{
190	if (atomic_dec_and_test(&fp->fi_access[oflag])) {
191	nfs4_file_put_fd(fp, O_RDWR);
192	nfs4_file_put_fd(fp, oflag);
193	}
194	}
195
196	static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
197	{
198	if (oflag == O_RDWR) {
199	__nfs4_file_put_access(fp, O_RDONLY);
200	__nfs4_file_put_access(fp, O_WRONLY);
201	} else
202	__nfs4_file_put_access(fp, oflag);
203	}
204
205	static struct nfs4_delegation *
206	alloc_init_deleg(struct nfs4_client clp, struct nfs4_stateid stp, struct svc_fh *current_fh, u32 type)
207	{
208	struct nfs4_delegation *dp;
209	struct nfs4_file *fp = stp->st_file;
210
211	dprintk("NFSD alloc_init_deleg\n");
212	/*
213	* Major work on the lease subsystem (for example, to support
214	* calbacks on stat) will be required before we can support
215	* write delegations properly.
216	*/
217	if (type != NFS4_OPEN_DELEGATE_READ)
218	return NULL;
219	if (fp->fi_had_conflict)
220	return NULL;
221	if (num_delegations > max_delegations)
222	return NULL;
223	dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
224	if (dp == NULL)
225	return dp;
226	num_delegations++;
227	INIT_LIST_HEAD(&dp->dl_perfile);
228	INIT_LIST_HEAD(&dp->dl_perclnt);
229	INIT_LIST_HEAD(&dp->dl_recall_lru);
230	dp->dl_client = clp;
231	get_nfs4_file(fp);
232	dp->dl_file = fp;
233	dp->dl_type = type;
234	dp->dl_stateid.si_boot = boot_time;
235	dp->dl_stateid.si_stateownerid = current_delegid++;
236	dp->dl_stateid.si_fileid = 0;
237	dp->dl_stateid.si_generation = 0;
238	fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
239	dp->dl_time = 0;
240	atomic_set(&dp->dl_count, 1);
241	INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
242	return dp;
243	}
244
245	void
246	nfs4_put_delegation(struct nfs4_delegation *dp)
247	{
248	if (atomic_dec_and_test(&dp->dl_count)) {
249	dprintk("NFSD: freeing dp %p\n",dp);
250	put_nfs4_file(dp->dl_file);
251	kmem_cache_free(deleg_slab, dp);
252	num_delegations--;
253	}
254	}
255
256	static void nfs4_put_deleg_lease(struct nfs4_file *fp)
257	{
258	if (atomic_dec_and_test(&fp->fi_delegees)) {
259	vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
260	fp->fi_lease = NULL;
261	fput(fp->fi_deleg_file);
262	fp->fi_deleg_file = NULL;
263	}
264	}
265
266	/* Called under the state lock. */
267	static void
268	unhash_delegation(struct nfs4_delegation *dp)
269	{
270	list_del_init(&dp->dl_perclnt);
271	spin_lock(&recall_lock);
272	list_del_init(&dp->dl_perfile);
273	list_del_init(&dp->dl_recall_lru);
274	spin_unlock(&recall_lock);
275	nfs4_put_deleg_lease(dp->dl_file);
276	nfs4_put_delegation(dp);
277	}
278
279	/*
280	* SETCLIENTID state
281	*/
282
283	/* client_lock protects the client lru list and session hash table */
284	static DEFINE_SPINLOCK(client_lock);
285
286	/* Hash tables for nfs4_clientid state */
287	#define CLIENT_HASH_BITS 4
288	#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
289	#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
290
291	#define clientid_hashval(id) \
292	((id) & CLIENT_HASH_MASK)
293	#define clientstr_hashval(name) \
294	(opaque_hashval((name), 8) & CLIENT_HASH_MASK)
295	/*
296	* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
297	* used in reboot/reset lease grace period processing
298	*
299	* conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
300	* setclientid_confirmed info.
301	*
302	* unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
303	* setclientid info.
304	*
305	* client_lru holds client queue ordered by nfs4_client.cl_time
306	* for lease renewal.
307	*
308	* close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
309	* for last close replay.
310	*/
311	static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
312	static int reclaim_str_hashtbl_size = 0;
313	static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
314	static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
315	static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
316	static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
317	static struct list_head client_lru;
318	static struct list_head close_lru;
319
320	/*
321	* We store the NONE, READ, WRITE, and BOTH bits separately in the
322	* st_{access,deny}_bmap field of the stateid, in order to track not
323	* only what share bits are currently in force, but also what
324	* combinations of share bits previous opens have used. This allows us
325	* to enforce the recommendation of rfc 3530 14.2.19 that the server
326	* return an error if the client attempt to downgrade to a combination
327	* of share bits not explicable by closing some of its previous opens.
328	*
329	* XXX: This enforcement is actually incomplete, since we don't keep
330	* track of access/deny bit combinations; so, e.g., we allow:
331	*
332	* OPEN allow read, deny write
333	* OPEN allow both, deny none
334	* DOWNGRADE allow read, deny none
335	*
336	* which we should reject.
337	*/
338	static void
339	set_access(unsigned int *access, unsigned long bmap) {
340	int i;
341
342	*access = 0;
343	for (i = 1; i < 4; i++) {
344	if (test_bit(i, &bmap))
345	*access \|= i;
346	}
347	}
348
349	static void
350	set_deny(unsigned int *deny, unsigned long bmap) {
351	int i;
352
353	*deny = 0;
354	for (i = 0; i < 4; i++) {
355	if (test_bit(i, &bmap))
356	*deny \|= i ;
357	}
358	}
359
360	static int
361	test_share(struct nfs4_stateid stp, struct nfsd4_open open) {
362	unsigned int access, deny;
363
364	set_access(&access, stp->st_access_bmap);
365	set_deny(&deny, stp->st_deny_bmap);
366	if ((access & open->op_share_deny) \|\| (deny & open->op_share_access))
367	return 0;
368	return 1;
369	}
370
371	static int nfs4_access_to_omode(u32 access)
372	{
373	switch (access & NFS4_SHARE_ACCESS_BOTH) {
374	case NFS4_SHARE_ACCESS_READ:
375	return O_RDONLY;
376	case NFS4_SHARE_ACCESS_WRITE:
377	return O_WRONLY;
378	case NFS4_SHARE_ACCESS_BOTH:
379	return O_RDWR;
380	}
381	BUG();
382	}
383
384	static int nfs4_access_bmap_to_omode(struct nfs4_stateid *stp)
385	{
386	unsigned int access;
387
388	set_access(&access, stp->st_access_bmap);
389	return nfs4_access_to_omode(access);
390	}
391
392	static void unhash_generic_stateid(struct nfs4_stateid *stp)
393	{
394	list_del(&stp->st_hash);
395	list_del(&stp->st_perfile);
396	list_del(&stp->st_perstateowner);
397	}
398
399	static void free_generic_stateid(struct nfs4_stateid *stp)
400	{
401	int oflag;
402
403	if (stp->st_access_bmap) {
404	oflag = nfs4_access_bmap_to_omode(stp);
405	nfs4_file_put_access(stp->st_file, oflag);
406	}
407	put_nfs4_file(stp->st_file);
408	kmem_cache_free(stateid_slab, stp);
409	}
410
411	static void release_lock_stateid(struct nfs4_stateid *stp)
412	{
413	struct file *file;
414
415	unhash_generic_stateid(stp);
416	file = find_any_file(stp->st_file);
417	if (file)
418	locks_remove_posix(file, (fl_owner_t)stp->st_stateowner);
419	free_generic_stateid(stp);
420	}
421
422	static void unhash_lockowner(struct nfs4_stateowner *sop)
423	{
424	struct nfs4_stateid *stp;
425
426	list_del(&sop->so_idhash);
427	list_del(&sop->so_strhash);
428	list_del(&sop->so_perstateid);
429	while (!list_empty(&sop->so_stateids)) {
430	stp = list_first_entry(&sop->so_stateids,
431	struct nfs4_stateid, st_perstateowner);
432	release_lock_stateid(stp);
433	}
434	}
435
436	static void release_lockowner(struct nfs4_stateowner *sop)
437	{
438	unhash_lockowner(sop);
439	nfs4_put_stateowner(sop);
440	}
441
442	static void
443	release_stateid_lockowners(struct nfs4_stateid *open_stp)
444	{
445	struct nfs4_stateowner *lock_sop;
446
447	while (!list_empty(&open_stp->st_lockowners)) {
448	lock_sop = list_entry(open_stp->st_lockowners.next,
449	struct nfs4_stateowner, so_perstateid);
450	/* list_del(&open_stp->st_lockowners); */
451	BUG_ON(lock_sop->so_is_open_owner);
452	release_lockowner(lock_sop);
453	}
454	}
455
456	static void release_open_stateid(struct nfs4_stateid *stp)
457	{
458	unhash_generic_stateid(stp);
459	release_stateid_lockowners(stp);
460	free_generic_stateid(stp);
461	}
462
463	static void unhash_openowner(struct nfs4_stateowner *sop)
464	{
465	struct nfs4_stateid *stp;
466
467	list_del(&sop->so_idhash);
468	list_del(&sop->so_strhash);
469	list_del(&sop->so_perclient);
470	list_del(&sop->so_perstateid); /* XXX: necessary? */
471	while (!list_empty(&sop->so_stateids)) {
472	stp = list_first_entry(&sop->so_stateids,
473	struct nfs4_stateid, st_perstateowner);
474	release_open_stateid(stp);
475	}
476	}
477
478	static void release_openowner(struct nfs4_stateowner *sop)
479	{
480	unhash_openowner(sop);
481	list_del(&sop->so_close_lru);
482	nfs4_put_stateowner(sop);
483	}
484
485	#define SESSION_HASH_SIZE 512
486	static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
487
488	static inline int
489	hash_sessionid(struct nfs4_sessionid *sessionid)
490	{
491	struct nfsd4_sessionid sid = (struct nfsd4_sessionid )sessionid;
492
493	return sid->sequence % SESSION_HASH_SIZE;
494	}
495
496	static inline void
497	dump_sessionid(const char fn, struct nfs4_sessionid sessionid)
498	{
499	u32 ptr = (u32 )(&sessionid->data[0]);
500	dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
501	}
502
503	static void
504	gen_sessionid(struct nfsd4_session *ses)
505	{
506	struct nfs4_client *clp = ses->se_client;
507	struct nfsd4_sessionid *sid;
508
509	sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
510	sid->clientid = clp->cl_clientid;
511	sid->sequence = current_sessionid++;
512	sid->reserved = 0;
513	}
514
515	/*
516	* The protocol defines ca_maxresponssize_cached to include the size of
517	* the rpc header, but all we need to cache is the data starting after
518	* the end of the initial SEQUENCE operation--the rest we regenerate
519	* each time. Therefore we can advertise a ca_maxresponssize_cached
520	* value that is the number of bytes in our cache plus a few additional
521	* bytes. In order to stay on the safe side, and not promise more than
522	* we can cache, those additional bytes must be the minimum possible: 24
523	* bytes of rpc header (xid through accept state, with AUTH_NULL
524	* verifier), 12 for the compound header (with zero-length tag), and 44
525	* for the SEQUENCE op response:
526	*/
527	#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
528
529	static void
530	free_session_slots(struct nfsd4_session *ses)
531	{
532	int i;
533
534	for (i = 0; i < ses->se_fchannel.maxreqs; i++)
535	kfree(ses->se_slots[i]);
536	}
537
538	/*
539	* We don't actually need to cache the rpc and session headers, so we
540	* can allocate a little less for each slot:
541	*/
542	static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
543	{
544	return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
545	}
546
547	static int nfsd4_sanitize_slot_size(u32 size)
548	{
549	size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
550	size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
551
552	return size;
553	}
554
555	/*
556	* XXX: If we run out of reserved DRC memory we could (up to a point)
557	* re-negotiate active sessions and reduce their slot usage to make
558	* rooom for new connections. For now we just fail the create session.
559	*/
560	static int nfsd4_get_drc_mem(int slotsize, u32 num)
561	{
562	int avail;
563
564	num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
565
566	spin_lock(&nfsd_drc_lock);
567	avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
568	nfsd_drc_max_mem - nfsd_drc_mem_used);
569	num = min_t(int, num, avail / slotsize);
570	nfsd_drc_mem_used += num * slotsize;
571	spin_unlock(&nfsd_drc_lock);
572
573	return num;
574	}
575
576	static void nfsd4_put_drc_mem(int slotsize, int num)
577	{
578	spin_lock(&nfsd_drc_lock);
579	nfsd_drc_mem_used -= slotsize * num;
580	spin_unlock(&nfsd_drc_lock);
581	}
582
583	static struct nfsd4_session *alloc_session(int slotsize, int numslots)
584	{
585	struct nfsd4_session *new;
586	int mem, i;
587
588	BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
589	+ sizeof(struct nfsd4_session) > PAGE_SIZE);
590	mem = numslots * sizeof(struct nfsd4_slot *);
591
592	new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
593	if (!new)
594	return NULL;
595	/* allocate each struct nfsd4_slot and data cache in one piece */
596	for (i = 0; i < numslots; i++) {
597	mem = sizeof(struct nfsd4_slot) + slotsize;
598	new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
599	if (!new->se_slots[i])
600	goto out_free;
601	}
602	return new;
603	out_free:
604	while (i--)
605	kfree(new->se_slots[i]);
606	kfree(new);
607	return NULL;
608	}
609
610	static void init_forechannel_attrs(struct nfsd4_channel_attrs new, struct nfsd4_channel_attrs req, int numslots, int slotsize)
611	{
612	u32 maxrpc = nfsd_serv->sv_max_mesg;
613
614	new->maxreqs = numslots;
615	new->maxresp_cached = min_t(u32, req->maxresp_cached,
616	slotsize + NFSD_MIN_HDR_SEQ_SZ);
617	new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
618	new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
619	new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
620	}
621
622	static void free_conn(struct nfsd4_conn *c)
623	{
624	svc_xprt_put(c->cn_xprt);
625	kfree(c);
626	}
627
628	static void nfsd4_conn_lost(struct svc_xpt_user *u)
629	{
630	struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
631	struct nfs4_client *clp = c->cn_session->se_client;
632
633	spin_lock(&clp->cl_lock);
634	if (!list_empty(&c->cn_persession)) {
635	list_del(&c->cn_persession);
636	free_conn(c);
637	}
638	spin_unlock(&clp->cl_lock);
639	nfsd4_probe_callback(clp);
640	}
641
642	static struct nfsd4_conn alloc_conn(struct svc_rqst rqstp, u32 flags)
643	{
644	struct nfsd4_conn *conn;
645
646	conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
647	if (!conn)
648	return NULL;
649	svc_xprt_get(rqstp->rq_xprt);
650	conn->cn_xprt = rqstp->rq_xprt;
651	conn->cn_flags = flags;
652	INIT_LIST_HEAD(&conn->cn_xpt_user.list);
653	return conn;
654	}
655
656	static void __nfsd4_hash_conn(struct nfsd4_conn conn, struct nfsd4_session ses)
657	{
658	conn->cn_session = ses;
659	list_add(&conn->cn_persession, &ses->se_conns);
660	}
661
662	static void nfsd4_hash_conn(struct nfsd4_conn conn, struct nfsd4_session ses)
663	{
664	struct nfs4_client *clp = ses->se_client;
665
666	spin_lock(&clp->cl_lock);
667	__nfsd4_hash_conn(conn, ses);
668	spin_unlock(&clp->cl_lock);
669	}
670
671	static int nfsd4_register_conn(struct nfsd4_conn *conn)
672	{
673	conn->cn_xpt_user.callback = nfsd4_conn_lost;
674	return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
675	}
676
677	static __be32 nfsd4_new_conn(struct svc_rqst rqstp, struct nfsd4_session ses, u32 dir)
678	{
679	struct nfsd4_conn *conn;
680	int ret;
681
682	conn = alloc_conn(rqstp, dir);
683	if (!conn)
684	return nfserr_jukebox;
685	nfsd4_hash_conn(conn, ses);
686	ret = nfsd4_register_conn(conn);
687	if (ret)
688	/* oops; xprt is already down: */
689	nfsd4_conn_lost(&conn->cn_xpt_user);
690	return nfs_ok;
691	}
692
693	static __be32 nfsd4_new_conn_from_crses(struct svc_rqst rqstp, struct nfsd4_session ses)
694	{
695	u32 dir = NFS4_CDFC4_FORE;
696
697	if (ses->se_flags & SESSION4_BACK_CHAN)
698	dir \|= NFS4_CDFC4_BACK;
699
700	return nfsd4_new_conn(rqstp, ses, dir);
701	}
702
703	/* must be called under client_lock */
704	static void nfsd4_del_conns(struct nfsd4_session *s)
705	{
706	struct nfs4_client *clp = s->se_client;
707	struct nfsd4_conn *c;
708
709	spin_lock(&clp->cl_lock);
710	while (!list_empty(&s->se_conns)) {
711	c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
712	list_del_init(&c->cn_persession);
713	spin_unlock(&clp->cl_lock);
714
715	unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
716	free_conn(c);
717
718	spin_lock(&clp->cl_lock);
719	}
720	spin_unlock(&clp->cl_lock);
721	}
722
723	void free_session(struct kref *kref)
724	{
725	struct nfsd4_session *ses;
726	int mem;
727
728	ses = container_of(kref, struct nfsd4_session, se_ref);
729	nfsd4_del_conns(ses);
730	spin_lock(&nfsd_drc_lock);
731	mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
732	nfsd_drc_mem_used -= mem;
733	spin_unlock(&nfsd_drc_lock);
734	free_session_slots(ses);
735	kfree(ses);
736	}
737
738	static struct nfsd4_session alloc_init_session(struct svc_rqst rqstp, struct nfs4_client clp, struct nfsd4_create_session cses)
739	{
740	struct nfsd4_session *new;
741	struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
742	int numslots, slotsize;
743	int status;
744	int idx;
745
746	/*
747	* Note decreasing slot size below client's request may
748	* make it difficult for client to function correctly, whereas
749	* decreasing the number of slots will (just?) affect
750	* performance. When short on memory we therefore prefer to
751	* decrease number of slots instead of their size.
752	*/
753	slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
754	numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
755	if (numslots < 1)
756	return NULL;
757
758	new = alloc_session(slotsize, numslots);
759	if (!new) {
760	nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
761	return NULL;
762	}
763	init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
764
765	new->se_client = clp;
766	gen_sessionid(new);
767
768	INIT_LIST_HEAD(&new->se_conns);
769
770	new->se_cb_seq_nr = 1;
771	new->se_flags = cses->flags;
772	new->se_cb_prog = cses->callback_prog;
773	kref_init(&new->se_ref);
774	idx = hash_sessionid(&new->se_sessionid);
775	spin_lock(&client_lock);
776	list_add(&new->se_hash, &sessionid_hashtbl[idx]);
777	spin_lock(&clp->cl_lock);
778	list_add(&new->se_perclnt, &clp->cl_sessions);
779	spin_unlock(&clp->cl_lock);
780	spin_unlock(&client_lock);
781
782	status = nfsd4_new_conn_from_crses(rqstp, new);
783	/* whoops: benny points out, status is ignored! (err, or bogus) */
784	if (status) {
785	free_session(&new->se_ref);
786	return NULL;
787	}
788	if (cses->flags & SESSION4_BACK_CHAN) {
789	struct sockaddr *sa = svc_addr(rqstp);
790	/*
791	* This is a little silly; with sessions there's no real
792	* use for the callback address. Use the peer address
793	* as a reasonable default for now, but consider fixing
794	* the rpc client not to require an address in the
795	* future:
796	*/
797	rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
798	clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
799	}
800	nfsd4_probe_callback(clp);
801	return new;
802	}
803
804	/* caller must hold client_lock */
805	static struct nfsd4_session *
806	find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
807	{
808	struct nfsd4_session *elem;
809	int idx;
810
811	dump_sessionid(__func__, sessionid);
812	idx = hash_sessionid(sessionid);
813	/* Search in the appropriate list */
814	list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
815	if (!memcmp(elem->se_sessionid.data, sessionid->data,
816	NFS4_MAX_SESSIONID_LEN)) {
817	return elem;
818	}
819	}
820
821	dprintk("%s: session not found\n", __func__);
822	return NULL;
823	}
824
825	/* caller must hold client_lock */
826	static void
827	unhash_session(struct nfsd4_session *ses)
828	{
829	list_del(&ses->se_hash);
830	spin_lock(&ses->se_client->cl_lock);
831	list_del(&ses->se_perclnt);
832	spin_unlock(&ses->se_client->cl_lock);
833	}
834
835	/* must be called under the client_lock */
836	static inline void
837	renew_client_locked(struct nfs4_client *clp)
838	{
839	if (is_client_expired(clp)) {
840	dprintk("%s: client (clientid %08x/%08x) already expired\n",
841	__func__,
842	clp->cl_clientid.cl_boot,
843	clp->cl_clientid.cl_id);
844	return;
845	}
846
847	/*
848	* Move client to the end to the LRU list.
849	*/
850	dprintk("renewing client (clientid %08x/%08x)\n",
851	clp->cl_clientid.cl_boot,
852	clp->cl_clientid.cl_id);
853	list_move_tail(&clp->cl_lru, &client_lru);
854	clp->cl_time = get_seconds();
855	}
856
857	static inline void
858	renew_client(struct nfs4_client *clp)
859	{
860	spin_lock(&client_lock);
861	renew_client_locked(clp);
862	spin_unlock(&client_lock);
863	}
864
865	/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
866	static int
867	STALE_CLIENTID(clientid_t *clid)
868	{
869	if (clid->cl_boot == boot_time)
870	return 0;
871	dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
872	clid->cl_boot, clid->cl_id, boot_time);
873	return 1;
874	}
875
876	/*
877	* XXX Should we use a slab cache ?
878	* This type of memory management is somewhat inefficient, but we use it
879	* anyway since SETCLIENTID is not a common operation.
880	*/
881	static struct nfs4_client *alloc_client(struct xdr_netobj name)
882	{
883	struct nfs4_client *clp;
884
885	clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
886	if (clp == NULL)
887	return NULL;
888	clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
889	if (clp->cl_name.data == NULL) {
890	kfree(clp);
891	return NULL;
892	}
893	memcpy(clp->cl_name.data, name.data, name.len);
894	clp->cl_name.len = name.len;
895	return clp;
896	}
897
898	static inline void
899	free_client(struct nfs4_client *clp)
900	{
901	while (!list_empty(&clp->cl_sessions)) {
902	struct nfsd4_session *ses;
903	ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
904	se_perclnt);
905	list_del(&ses->se_perclnt);
906	nfsd4_put_session(ses);
907	}
908	if (clp->cl_cred.cr_group_info)
909	put_group_info(clp->cl_cred.cr_group_info);
910	kfree(clp->cl_principal);
911	kfree(clp->cl_name.data);
912	kfree(clp);
913	}
914
915	void
916	release_session_client(struct nfsd4_session *session)
917	{
918	struct nfs4_client *clp = session->se_client;
919
920	if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
921	return;
922	if (is_client_expired(clp)) {
923	free_client(clp);
924	session->se_client = NULL;
925	} else
926	renew_client_locked(clp);
927	spin_unlock(&client_lock);
928	}
929
930	/* must be called under the client_lock */
931	static inline void
932	unhash_client_locked(struct nfs4_client *clp)
933	{
934	struct nfsd4_session *ses;
935
936	mark_client_expired(clp);
937	list_del(&clp->cl_lru);
938	spin_lock(&clp->cl_lock);
939	list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
940	list_del_init(&ses->se_hash);
941	spin_unlock(&clp->cl_lock);
942	}
943
944	static void
945	expire_client(struct nfs4_client *clp)
946	{
947	struct nfs4_stateowner *sop;
948	struct nfs4_delegation *dp;
949	struct list_head reaplist;
950
951	INIT_LIST_HEAD(&reaplist);
952	spin_lock(&recall_lock);
953	while (!list_empty(&clp->cl_delegations)) {
954	dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
955	list_del_init(&dp->dl_perclnt);
956	list_move(&dp->dl_recall_lru, &reaplist);
957	}
958	spin_unlock(&recall_lock);
959	while (!list_empty(&reaplist)) {
960	dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
961	list_del_init(&dp->dl_recall_lru);
962	unhash_delegation(dp);
963	}
964	while (!list_empty(&clp->cl_openowners)) {
965	sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
966	release_openowner(sop);
967	}
968	nfsd4_shutdown_callback(clp);
969	if (clp->cl_cb_conn.cb_xprt)
970	svc_xprt_put(clp->cl_cb_conn.cb_xprt);
971	list_del(&clp->cl_idhash);
972	list_del(&clp->cl_strhash);
973	spin_lock(&client_lock);
974	unhash_client_locked(clp);
975	if (atomic_read(&clp->cl_refcount) == 0)
976	free_client(clp);
977	spin_unlock(&client_lock);
978	}
979
980	static void copy_verf(struct nfs4_client target, nfs4_verifier source)
981	{
982	memcpy(target->cl_verifier.data, source->data,
983	sizeof(target->cl_verifier.data));
984	}
985
986	static void copy_clid(struct nfs4_client target, struct nfs4_client source)
987	{
988	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
989	target->cl_clientid.cl_id = source->cl_clientid.cl_id;
990	}
991
992	static void copy_cred(struct svc_cred target, struct svc_cred source)
993	{
994	target->cr_uid = source->cr_uid;
995	target->cr_gid = source->cr_gid;
996	target->cr_group_info = source->cr_group_info;
997	get_group_info(target->cr_group_info);
998	}
999
1000	static int same_name(const char n1, const char n2)
1001	{
1002	return 0 == memcmp(n1, n2, HEXDIR_LEN);
1003	}
1004
1005	static int
1006	same_verf(nfs4_verifier v1, nfs4_verifier v2)
1007	{
1008	return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1009	}
1010
1011	static int
1012	same_clid(clientid_t cl1, clientid_t cl2)
1013	{
1014	return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1015	}
1016
1017	/* XXX what about NGROUP */
1018	static int
1019	same_creds(struct svc_cred cr1, struct svc_cred cr2)
1020	{
1021	return cr1->cr_uid == cr2->cr_uid;
1022	}
1023
1024	static void gen_clid(struct nfs4_client *clp)
1025	{
1026	static u32 current_clientid = 1;
1027
1028	clp->cl_clientid.cl_boot = boot_time;
1029	clp->cl_clientid.cl_id = current_clientid++;
1030	}
1031
1032	static void gen_confirm(struct nfs4_client *clp)
1033	{
1034	static u32 i;
1035	u32 *p;
1036
1037	p = (u32 *)clp->cl_confirm.data;
1038	*p++ = get_seconds();
1039	*p++ = i++;
1040	}
1041
1042	static struct nfs4_client create_client(struct xdr_netobj name, char recdir,
1043	struct svc_rqst rqstp, nfs4_verifier verf)
1044	{
1045	struct nfs4_client *clp;
1046	struct sockaddr *sa = svc_addr(rqstp);
1047	char *princ;
1048
1049	clp = alloc_client(name);
1050	if (clp == NULL)
1051	return NULL;
1052
1053	INIT_LIST_HEAD(&clp->cl_sessions);
1054
1055	princ = svc_gss_principal(rqstp);
1056	if (princ) {
1057	clp->cl_principal = kstrdup(princ, GFP_KERNEL);
1058	if (clp->cl_principal == NULL) {
1059	free_client(clp);
1060	return NULL;
1061	}
1062	}
1063
1064	memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1065	atomic_set(&clp->cl_refcount, 0);
1066	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1067	INIT_LIST_HEAD(&clp->cl_idhash);
1068	INIT_LIST_HEAD(&clp->cl_strhash);
1069	INIT_LIST_HEAD(&clp->cl_openowners);
1070	INIT_LIST_HEAD(&clp->cl_delegations);
1071	INIT_LIST_HEAD(&clp->cl_lru);
1072	INIT_LIST_HEAD(&clp->cl_callbacks);
1073	spin_lock_init(&clp->cl_lock);
1074	INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1075	clp->cl_time = get_seconds();
1076	clear_bit(0, &clp->cl_cb_slot_busy);
1077	rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1078	copy_verf(clp, verf);
1079	rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1080	clp->cl_flavor = rqstp->rq_flavor;
1081	copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1082	gen_confirm(clp);
1083	clp->cl_cb_session = NULL;
1084	return clp;
1085	}
1086
1087	static int check_name(struct xdr_netobj name)
1088	{
1089	if (name.len == 0)
1090	return 0;
1091	if (name.len > NFS4_OPAQUE_LIMIT) {
1092	dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1093	return 0;
1094	}
1095	return 1;
1096	}
1097
1098	static void
1099	add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1100	{
1101	unsigned int idhashval;
1102
1103	list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1104	idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1105	list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1106	renew_client(clp);
1107	}
1108
1109	static void
1110	move_to_confirmed(struct nfs4_client *clp)
1111	{
1112	unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1113	unsigned int strhashval;
1114
1115	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1116	list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1117	strhashval = clientstr_hashval(clp->cl_recdir);
1118	list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1119	renew_client(clp);
1120	}
1121
1122	static struct nfs4_client *
1123	find_confirmed_client(clientid_t *clid)
1124	{
1125	struct nfs4_client *clp;
1126	unsigned int idhashval = clientid_hashval(clid->cl_id);
1127
1128	list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1129	if (same_clid(&clp->cl_clientid, clid))
1130	return clp;
1131	}
1132	return NULL;
1133	}
1134
1135	static struct nfs4_client *
1136	find_unconfirmed_client(clientid_t *clid)
1137	{
1138	struct nfs4_client *clp;
1139	unsigned int idhashval = clientid_hashval(clid->cl_id);
1140
1141	list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1142	if (same_clid(&clp->cl_clientid, clid))
1143	return clp;
1144	}
1145	return NULL;
1146	}
1147
1148	static bool clp_used_exchangeid(struct nfs4_client *clp)
1149	{
1150	return clp->cl_exchange_flags != 0;
1151	}
1152
1153	static struct nfs4_client *
1154	find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1155	{
1156	struct nfs4_client *clp;
1157
1158	list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1159	if (same_name(clp->cl_recdir, dname))
1160	return clp;
1161	}
1162	return NULL;
1163	}
1164
1165	static struct nfs4_client *
1166	find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1167	{
1168	struct nfs4_client *clp;
1169
1170	list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1171	if (same_name(clp->cl_recdir, dname))
1172	return clp;
1173	}
1174	return NULL;
1175	}
1176
1177	static void rpc_svcaddr2sockaddr(struct sockaddr sa, unsigned short family, union svc_addr_u svcaddr)
1178	{
1179	switch (family) {
1180	case AF_INET:
1181	((struct sockaddr_in *)sa)->sin_family = AF_INET;
1182	((struct sockaddr_in *)sa)->sin_addr = svcaddr->addr;
1183	return;
1184	case AF_INET6:
1185	((struct sockaddr_in6 *)sa)->sin6_family = AF_INET6;
1186	((struct sockaddr_in6 *)sa)->sin6_addr = svcaddr->addr6;
1187	return;
1188	}
1189	}
1190
1191	static void
1192	gen_callback(struct nfs4_client clp, struct nfsd4_setclientid se, struct svc_rqst *rqstp)
1193	{
1194	struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1195	struct sockaddr *sa = svc_addr(rqstp);
1196	u32 scopeid = rpc_get_scope_id(sa);
1197	unsigned short expected_family;
1198
1199	/* Currently, we only support tcp and tcp6 for the callback channel */
1200	if (se->se_callback_netid_len == 3 &&
1201	!memcmp(se->se_callback_netid_val, "tcp", 3))
1202	expected_family = AF_INET;
1203	else if (se->se_callback_netid_len == 4 &&
1204	!memcmp(se->se_callback_netid_val, "tcp6", 4))
1205	expected_family = AF_INET6;
1206	else
1207	goto out_err;
1208
1209	conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
1210	se->se_callback_addr_len,
1211	(struct sockaddr *)&conn->cb_addr,
1212	sizeof(conn->cb_addr));
1213
1214	if (!conn->cb_addrlen \|\| conn->cb_addr.ss_family != expected_family)
1215	goto out_err;
1216
1217	if (conn->cb_addr.ss_family == AF_INET6)
1218	((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1219
1220	conn->cb_prog = se->se_callback_prog;
1221	conn->cb_ident = se->se_callback_ident;
1222	rpc_svcaddr2sockaddr((struct sockaddr *)&conn->cb_saddr, expected_family, &rqstp->rq_daddr);
1223	return;
1224	out_err:
1225	conn->cb_addr.ss_family = AF_UNSPEC;
1226	conn->cb_addrlen = 0;
1227	dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1228	"will not receive delegations\n",
1229	clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1230
1231	return;
1232	}
1233
1234	/*
1235	* Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1236	*/
1237	void
1238	nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1239	{
1240	struct nfsd4_slot *slot = resp->cstate.slot;
1241	unsigned int base;
1242
1243	dprintk("--> %s slot %p\n", __func__, slot);
1244
1245	slot->sl_opcnt = resp->opcnt;
1246	slot->sl_status = resp->cstate.status;
1247
1248	if (nfsd4_not_cached(resp)) {
1249	slot->sl_datalen = 0;
1250	return;
1251	}
1252	slot->sl_datalen = (char )resp->p - (char )resp->cstate.datap;
1253	base = (char *)resp->cstate.datap -
1254	(char *)resp->xbuf->head[0].iov_base;
1255	if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1256	slot->sl_datalen))
1257	WARN("%s: sessions DRC could not cache compound\n", __func__);
1258	return;
1259	}
1260
1261	/*
1262	* Encode the replay sequence operation from the slot values.
1263	* If cachethis is FALSE encode the uncached rep error on the next
1264	* operation which sets resp->p and increments resp->opcnt for
1265	* nfs4svc_encode_compoundres.
1266	*
1267	*/
1268	static __be32
1269	nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1270	struct nfsd4_compoundres *resp)
1271	{
1272	struct nfsd4_op *op;
1273	struct nfsd4_slot *slot = resp->cstate.slot;
1274
1275	dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
1276	resp->opcnt, resp->cstate.slot->sl_cachethis);
1277
1278	/* Encode the replayed sequence operation */
1279	op = &args->ops[resp->opcnt - 1];
1280	nfsd4_encode_operation(resp, op);
1281
1282	/* Return nfserr_retry_uncached_rep in next operation. */
1283	if (args->opcnt > 1 && slot->sl_cachethis == 0) {
1284	op = &args->ops[resp->opcnt++];
1285	op->status = nfserr_retry_uncached_rep;
1286	nfsd4_encode_operation(resp, op);
1287	}
1288	return op->status;
1289	}
1290
1291	/*
1292	* The sequence operation is not cached because we can use the slot and
1293	* session values.
1294	*/
1295	__be32
1296	nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1297	struct nfsd4_sequence *seq)
1298	{
1299	struct nfsd4_slot *slot = resp->cstate.slot;
1300	__be32 status;
1301
1302	dprintk("--> %s slot %p\n", __func__, slot);
1303
1304	/* Either returns 0 or nfserr_retry_uncached */
1305	status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1306	if (status == nfserr_retry_uncached_rep)
1307	return status;
1308
1309	/* The sequence operation has been encoded, cstate->datap set. */
1310	memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1311
1312	resp->opcnt = slot->sl_opcnt;
1313	resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1314	status = slot->sl_status;
1315
1316	return status;
1317	}
1318
1319	/*
1320	* Set the exchange_id flags returned by the server.
1321	*/
1322	static void
1323	nfsd4_set_ex_flags(struct nfs4_client new, struct nfsd4_exchange_id clid)
1324	{
1325	/* pNFS is not supported */
1326	new->cl_exchange_flags \|= EXCHGID4_FLAG_USE_NON_PNFS;
1327
1328	/* Referrals are supported, Migration is not. */
1329	new->cl_exchange_flags \|= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1330
1331	/* set the wire flags to return to client. */
1332	clid->flags = new->cl_exchange_flags;
1333	}
1334
1335	__be32
1336	nfsd4_exchange_id(struct svc_rqst *rqstp,
1337	struct nfsd4_compound_state *cstate,
1338	struct nfsd4_exchange_id *exid)
1339	{
1340	struct nfs4_client unconf, conf, *new;
1341	int status;
1342	unsigned int strhashval;
1343	char dname[HEXDIR_LEN];
1344	char addr_str[INET6_ADDRSTRLEN];
1345	nfs4_verifier verf = exid->verifier;
1346	struct sockaddr *sa = svc_addr(rqstp);
1347
1348	rpc_ntop(sa, addr_str, sizeof(addr_str));
1349	dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1350	"ip_addr=%s flags %x, spa_how %d\n",
1351	__func__, rqstp, exid, exid->clname.len, exid->clname.data,
1352	addr_str, exid->flags, exid->spa_how);
1353
1354	if (!check_name(exid->clname) \|\| (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1355	return nfserr_inval;
1356
1357	/* Currently only support SP4_NONE */
1358	switch (exid->spa_how) {
1359	case SP4_NONE:
1360	break;
1361	case SP4_SSV:
1362	return nfserr_serverfault;
1363	default:
1364	BUG(); /* checked by xdr code */
1365	case SP4_MACH_CRED:
1366	return nfserr_serverfault; /* no excuse :-/ */
1367	}
1368
1369	status = nfs4_make_rec_clidname(dname, &exid->clname);
1370
1371	if (status)
1372	goto error;
1373
1374	strhashval = clientstr_hashval(dname);
1375
1376	nfs4_lock_state();
1377	status = nfs_ok;
1378
1379	conf = find_confirmed_client_by_str(dname, strhashval);
1380	if (conf) {
1381	if (!clp_used_exchangeid(conf)) {
1382	status = nfserr_clid_inuse; /* XXX: ? */
1383	goto out;
1384	}
1385	if (!same_verf(&verf, &conf->cl_verifier)) {
1386	/* 18.35.4 case 8 */
1387	if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1388	status = nfserr_not_same;
1389	goto out;
1390	}
1391	/* Client reboot: destroy old state */
1392	expire_client(conf);
1393	goto out_new;
1394	}
1395	if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1396	/* 18.35.4 case 9 */
1397	if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1398	status = nfserr_perm;
1399	goto out;
1400	}
1401	expire_client(conf);
1402	goto out_new;
1403	}
1404	/*
1405	* Set bit when the owner id and verifier map to an already
1406	* confirmed client id (18.35.3).
1407	*/
1408	exid->flags \|= EXCHGID4_FLAG_CONFIRMED_R;
1409
1410	/*
1411	* Falling into 18.35.4 case 2, possible router replay.
1412	* Leave confirmed record intact and return same result.
1413	*/
1414	copy_verf(conf, &verf);
1415	new = conf;
1416	goto out_copy;
1417	}
1418
1419	/* 18.35.4 case 7 */
1420	if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1421	status = nfserr_noent;
1422	goto out;
1423	}
1424
1425	unconf = find_unconfirmed_client_by_str(dname, strhashval);
1426	if (unconf) {
1427	/*
1428	* Possible retry or client restart. Per 18.35.4 case 4,
1429	* a new unconfirmed record should be generated regardless
1430	* of whether any properties have changed.
1431	*/
1432	expire_client(unconf);
1433	}
1434
1435	out_new:
1436	/* Normal case */
1437	new = create_client(exid->clname, dname, rqstp, &verf);
1438	if (new == NULL) {
1439	status = nfserr_jukebox;
1440	goto out;
1441	}
1442
1443	gen_clid(new);
1444	add_to_unconfirmed(new, strhashval);
1445	out_copy:
1446	exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1447	exid->clientid.cl_id = new->cl_clientid.cl_id;
1448
1449	exid->seqid = 1;
1450	nfsd4_set_ex_flags(new, exid);
1451
1452	dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1453	new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1454	status = nfs_ok;
1455
1456	out:
1457	nfs4_unlock_state();
1458	error:
1459	dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1460	return status;
1461	}
1462
1463	static int
1464	check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1465	{
1466	dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1467	slot_seqid);
1468
1469	/* The slot is in use, and no response has been sent. */
1470	if (slot_inuse) {
1471	if (seqid == slot_seqid)
1472	return nfserr_jukebox;
1473	else
1474	return nfserr_seq_misordered;
1475	}
1476	/* Normal */
1477	if (likely(seqid == slot_seqid + 1))
1478	return nfs_ok;
1479	/* Replay */
1480	if (seqid == slot_seqid)
1481	return nfserr_replay_cache;
1482	/* Wraparound */
1483	if (seqid == 1 && (slot_seqid + 1) == 0)
1484	return nfs_ok;
1485	/* Misordered replay or misordered new request */
1486	return nfserr_seq_misordered;
1487	}
1488
1489	/*
1490	* Cache the create session result into the create session single DRC
1491	* slot cache by saving the xdr structure. sl_seqid has been set.
1492	* Do this for solo or embedded create session operations.
1493	*/
1494	static void
1495	nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1496	struct nfsd4_clid_slot *slot, int nfserr)
1497	{
1498	slot->sl_status = nfserr;
1499	memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1500	}
1501
1502	static __be32
1503	nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1504	struct nfsd4_clid_slot *slot)
1505	{
1506	memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1507	return slot->sl_status;
1508	}
1509
1510	__be32
1511	nfsd4_create_session(struct svc_rqst *rqstp,
1512	struct nfsd4_compound_state *cstate,
1513	struct nfsd4_create_session *cr_ses)
1514	{
1515	struct sockaddr *sa = svc_addr(rqstp);
1516	struct nfs4_client conf, unconf;
1517	struct nfsd4_session *new;
1518	struct nfsd4_clid_slot *cs_slot = NULL;
1519	bool confirm_me = false;
1520	int status = 0;
1521
1522	if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1523	return nfserr_inval;
1524
1525	nfs4_lock_state();
1526	unconf = find_unconfirmed_client(&cr_ses->clientid);
1527	conf = find_confirmed_client(&cr_ses->clientid);
1528
1529	if (conf) {
1530	cs_slot = &conf->cl_cs_slot;
1531	status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1532	if (status == nfserr_replay_cache) {
1533	dprintk("Got a create_session replay! seqid= %d\n",
1534	cs_slot->sl_seqid);
1535	/* Return the cached reply status */
1536	status = nfsd4_replay_create_session(cr_ses, cs_slot);
1537	goto out;
1538	} else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1539	status = nfserr_seq_misordered;
1540	dprintk("Sequence misordered!\n");
1541	dprintk("Expected seqid= %d but got seqid= %d\n",
1542	cs_slot->sl_seqid, cr_ses->seqid);
1543	goto out;
1544	}
1545	} else if (unconf) {
1546	if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) \|\|
1547	!rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1548	status = nfserr_clid_inuse;
1549	goto out;
1550	}
1551
1552	cs_slot = &unconf->cl_cs_slot;
1553	status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1554	if (status) {
1555	/* an unconfirmed replay returns misordered */
1556	status = nfserr_seq_misordered;
1557	goto out;
1558	}
1559
1560	confirm_me = true;
1561	conf = unconf;
1562	} else {
1563	status = nfserr_stale_clientid;
1564	goto out;
1565	}
1566
1567	/*
1568	* XXX: we should probably set this at creation time, and check
1569	* for consistent minorversion use throughout:
1570	*/
1571	conf->cl_minorversion = 1;
1572	/*
1573	* We do not support RDMA or persistent sessions
1574	*/
1575	cr_ses->flags &= ~SESSION4_PERSIST;
1576	cr_ses->flags &= ~SESSION4_RDMA;
1577
1578	status = nfserr_jukebox;
1579	new = alloc_init_session(rqstp, conf, cr_ses);
1580	if (!new)
1581	goto out;
1582	status = nfs_ok;
1583	memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1584	NFS4_MAX_SESSIONID_LEN);
1585	memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1586	sizeof(struct nfsd4_channel_attrs));
1587	cs_slot->sl_seqid++;
1588	cr_ses->seqid = cs_slot->sl_seqid;
1589
1590	/* cache solo and embedded create sessions under the state lock */
1591	nfsd4_cache_create_session(cr_ses, cs_slot, status);
1592	if (confirm_me)
1593	move_to_confirmed(conf);
1594	out:
1595	nfs4_unlock_state();
1596	dprintk("%s returns %d\n", __func__, ntohl(status));
1597	return status;
1598	}
1599
1600	static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1601	{
1602	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1603	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1604
1605	return argp->opcnt == resp->opcnt;
1606	}
1607
1608	static __be32 nfsd4_map_bcts_dir(u32 *dir)
1609	{
1610	switch (*dir) {
1611	case NFS4_CDFC4_FORE:
1612	case NFS4_CDFC4_BACK:
1613	return nfs_ok;
1614	case NFS4_CDFC4_FORE_OR_BOTH:
1615	case NFS4_CDFC4_BACK_OR_BOTH:
1616	*dir = NFS4_CDFC4_BOTH;
1617	return nfs_ok;
1618	};
1619	return nfserr_inval;
1620	}
1621
1622	__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1623	struct nfsd4_compound_state *cstate,
1624	struct nfsd4_bind_conn_to_session *bcts)
1625	{
1626	__be32 status;
1627
1628	if (!nfsd4_last_compound_op(rqstp))
1629	return nfserr_not_only_op;
1630	spin_lock(&client_lock);
1631	cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1632	/* Sorta weird: we only need the refcnt'ing because new_conn acquires
1633	* client_lock iself: */
1634	if (cstate->session) {
1635	nfsd4_get_session(cstate->session);
1636	atomic_inc(&cstate->session->se_client->cl_refcount);
1637	}
1638	spin_unlock(&client_lock);
1639	if (!cstate->session)
1640	return nfserr_badsession;
1641
1642	status = nfsd4_map_bcts_dir(&bcts->dir);
1643	if (!status)
1644	nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
1645	return status;
1646	}
1647
1648	static bool nfsd4_compound_in_session(struct nfsd4_session session, struct nfs4_sessionid sid)
1649	{
1650	if (!session)
1651	return 0;
1652	return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1653	}
1654
1655	__be32
1656	nfsd4_destroy_session(struct svc_rqst *r,
1657	struct nfsd4_compound_state *cstate,
1658	struct nfsd4_destroy_session *sessionid)
1659	{
1660	struct nfsd4_session *ses;
1661	u32 status = nfserr_badsession;
1662
1663	/* Notes:
1664	* - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1665	* - Should we return nfserr_back_chan_busy if waiting for
1666	* callbacks on to-be-destroyed session?
1667	* - Do we need to clear any callback info from previous session?
1668	*/
1669
1670	if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1671	if (!nfsd4_last_compound_op(r))
1672	return nfserr_not_only_op;
1673	}
1674	dump_sessionid(__func__, &sessionid->sessionid);
1675	spin_lock(&client_lock);
1676	ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1677	if (!ses) {
1678	spin_unlock(&client_lock);
1679	goto out;
1680	}
1681
1682	unhash_session(ses);
1683	spin_unlock(&client_lock);
1684
1685	nfs4_lock_state();
1686	nfsd4_probe_callback_sync(ses->se_client);
1687	nfs4_unlock_state();
1688
1689	nfsd4_del_conns(ses);
1690
1691	nfsd4_put_session(ses);
1692	status = nfs_ok;
1693	out:
1694	dprintk("%s returns %d\n", __func__, ntohl(status));
1695	return status;
1696	}
1697
1698	static struct nfsd4_conn __nfsd4_find_conn(struct svc_xprt xpt, struct nfsd4_session *s)
1699	{
1700	struct nfsd4_conn *c;
1701
1702	list_for_each_entry(c, &s->se_conns, cn_persession) {
1703	if (c->cn_xprt == xpt) {
1704	return c;
1705	}
1706	}
1707	return NULL;
1708	}
1709
1710	static void nfsd4_sequence_check_conn(struct nfsd4_conn new, struct nfsd4_session ses)
1711	{
1712	struct nfs4_client *clp = ses->se_client;
1713	struct nfsd4_conn *c;
1714	int ret;
1715
1716	spin_lock(&clp->cl_lock);
1717	c = __nfsd4_find_conn(new->cn_xprt, ses);
1718	if (c) {
1719	spin_unlock(&clp->cl_lock);
1720	free_conn(new);
1721	return;
1722	}
1723	__nfsd4_hash_conn(new, ses);
1724	spin_unlock(&clp->cl_lock);
1725	ret = nfsd4_register_conn(new);
1726	if (ret)
1727	/* oops; xprt is already down: */
1728	nfsd4_conn_lost(&new->cn_xpt_user);
1729	return;
1730	}
1731
1732	static bool nfsd4_session_too_many_ops(struct svc_rqst rqstp, struct nfsd4_session session)
1733	{
1734	struct nfsd4_compoundargs *args = rqstp->rq_argp;
1735
1736	return args->opcnt > session->se_fchannel.maxops;
1737	}
1738
1739	__be32
1740	nfsd4_sequence(struct svc_rqst *rqstp,
1741	struct nfsd4_compound_state *cstate,
1742	struct nfsd4_sequence *seq)
1743	{
1744	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1745	struct nfsd4_session *session;
1746	struct nfsd4_slot *slot;
1747	struct nfsd4_conn *conn;
1748	int status;
1749
1750	if (resp->opcnt != 1)
1751	return nfserr_sequence_pos;
1752
1753	/*
1754	* Will be either used or freed by nfsd4_sequence_check_conn
1755	* below.
1756	*/
1757	conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1758	if (!conn)
1759	return nfserr_jukebox;
1760
1761	spin_lock(&client_lock);
1762	status = nfserr_badsession;
1763	session = find_in_sessionid_hashtbl(&seq->sessionid);
1764	if (!session)
1765	goto out;
1766
1767	status = nfserr_too_many_ops;
1768	if (nfsd4_session_too_many_ops(rqstp, session))
1769	goto out;
1770
1771	status = nfserr_badslot;
1772	if (seq->slotid >= session->se_fchannel.maxreqs)
1773	goto out;
1774
1775	slot = session->se_slots[seq->slotid];
1776	dprintk("%s: slotid %d\n", __func__, seq->slotid);
1777
1778	/* We do not negotiate the number of slots yet, so set the
1779	* maxslots to the session maxreqs which is used to encode
1780	* sr_highest_slotid and the sr_target_slot id to maxslots */
1781	seq->maxslots = session->se_fchannel.maxreqs;
1782
1783	status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
1784	if (status == nfserr_replay_cache) {
1785	cstate->slot = slot;
1786	cstate->session = session;
1787	/* Return the cached reply status and set cstate->status
1788	* for nfsd4_proc_compound processing */
1789	status = nfsd4_replay_cache_entry(resp, seq);
1790	cstate->status = nfserr_replay_cache;
1791	goto out;
1792	}
1793	if (status)
1794	goto out;
1795
1796	nfsd4_sequence_check_conn(conn, session);
1797	conn = NULL;
1798
1799	/* Success! bump slot seqid */
1800	slot->sl_inuse = true;
1801	slot->sl_seqid = seq->seqid;
1802	slot->sl_cachethis = seq->cachethis;
1803
1804	cstate->slot = slot;
1805	cstate->session = session;
1806
1807	out:
1808	/* Hold a session reference until done processing the compound. */
1809	if (cstate->session) {
1810	struct nfs4_client *clp = session->se_client;
1811
1812	nfsd4_get_session(cstate->session);
1813	atomic_inc(&clp->cl_refcount);
1814	if (clp->cl_cb_state == NFSD4_CB_DOWN)
1815	seq->status_flags \|= SEQ4_STATUS_CB_PATH_DOWN;
1816	}
1817	kfree(conn);
1818	spin_unlock(&client_lock);
1819	dprintk("%s: return %d\n", __func__, ntohl(status));
1820	return status;
1821	}
1822
1823	__be32
1824	nfsd4_reclaim_complete(struct svc_rqst rqstp, struct nfsd4_compound_state cstate, struct nfsd4_reclaim_complete *rc)
1825	{
1826	int status = 0;
1827
1828	if (rc->rca_one_fs) {
1829	if (!cstate->current_fh.fh_dentry)
1830	return nfserr_nofilehandle;
1831	/*
1832	* We don't take advantage of the rca_one_fs case.
1833	* That's OK, it's optional, we can safely ignore it.
1834	*/
1835	return nfs_ok;
1836	}
1837
1838	nfs4_lock_state();
1839	status = nfserr_complete_already;
1840	if (cstate->session->se_client->cl_firststate)
1841	goto out;
1842
1843	status = nfserr_stale_clientid;
1844	if (is_client_expired(cstate->session->se_client))
1845	/*
1846	* The following error isn't really legal.
1847	* But we only get here if the client just explicitly
1848	* destroyed the client. Surely it no longer cares what
1849	* error it gets back on an operation for the dead
1850	* client.
1851	*/
1852	goto out;
1853
1854	status = nfs_ok;
1855	nfsd4_create_clid_dir(cstate->session->se_client);
1856	out:
1857	nfs4_unlock_state();
1858	return status;
1859	}
1860
1861	__be32
1862	nfsd4_setclientid(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
1863	struct nfsd4_setclientid *setclid)
1864	{
1865	struct xdr_netobj clname = {
1866	.len = setclid->se_namelen,
1867	.data = setclid->se_name,
1868	};
1869	nfs4_verifier clverifier = setclid->se_verf;
1870	unsigned int strhashval;
1871	struct nfs4_client conf, unconf, *new;
1872	__be32 status;
1873	char dname[HEXDIR_LEN];
1874
1875	if (!check_name(clname))
1876	return nfserr_inval;
1877
1878	status = nfs4_make_rec_clidname(dname, &clname);
1879	if (status)
1880	return status;
1881
1882	/*
1883	* XXX The Duplicate Request Cache (DRC) has been checked (??)
1884	* We get here on a DRC miss.
1885	*/
1886
1887	strhashval = clientstr_hashval(dname);
1888
1889	nfs4_lock_state();
1890	conf = find_confirmed_client_by_str(dname, strhashval);
1891	if (conf) {
1892	/* RFC 3530 14.2.33 CASE 0: */
1893	status = nfserr_clid_inuse;
1894	if (clp_used_exchangeid(conf))
1895	goto out;
1896	if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1897	char addr_str[INET6_ADDRSTRLEN];
1898	rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1899	sizeof(addr_str));
1900	dprintk("NFSD: setclientid: string in use by client "
1901	"at %s\n", addr_str);
1902	goto out;
1903	}
1904	}
1905	/*
1906	* section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1907	* has a description of SETCLIENTID request processing consisting
1908	* of 5 bullet points, labeled as CASE0 - CASE4 below.
1909	*/
1910	unconf = find_unconfirmed_client_by_str(dname, strhashval);
1911	status = nfserr_resource;
1912	if (!conf) {
1913	/*
1914	* RFC 3530 14.2.33 CASE 4:
1915	* placed first, because it is the normal case
1916	*/
1917	if (unconf)
1918	expire_client(unconf);
1919	new = create_client(clname, dname, rqstp, &clverifier);
1920	if (new == NULL)
1921	goto out;
1922	gen_clid(new);
1923	} else if (same_verf(&conf->cl_verifier, &clverifier)) {
1924	/*
1925	* RFC 3530 14.2.33 CASE 1:
1926	* probable callback update
1927	*/
1928	if (unconf) {
1929	/* Note this is removing unconfirmed {x**},
1930	* which is stronger than RFC recommended {vxc**}.
1931	* This has the advantage that there is at most
1932	* one {x**} in either list at any time.
1933	*/
1934	expire_client(unconf);
1935	}
1936	new = create_client(clname, dname, rqstp, &clverifier);
1937	if (new == NULL)
1938	goto out;
1939	copy_clid(new, conf);
1940	} else if (!unconf) {
1941	/*
1942	* RFC 3530 14.2.33 CASE 2:
1943	* probable client reboot; state will be removed if
1944	* confirmed.
1945	*/
1946	new = create_client(clname, dname, rqstp, &clverifier);
1947	if (new == NULL)
1948	goto out;
1949	gen_clid(new);
1950	} else {
1951	/*
1952	* RFC 3530 14.2.33 CASE 3:
1953	* probable client reboot; state will be removed if
1954	* confirmed.
1955	*/
1956	expire_client(unconf);
1957	new = create_client(clname, dname, rqstp, &clverifier);
1958	if (new == NULL)
1959	goto out;
1960	gen_clid(new);
1961	}
1962	/*
1963	* XXX: we should probably set this at creation time, and check
1964	* for consistent minorversion use throughout:
1965	*/
1966	new->cl_minorversion = 0;
1967	gen_callback(new, setclid, rqstp);
1968	add_to_unconfirmed(new, strhashval);
1969	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1970	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1971	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1972	status = nfs_ok;
1973	out:
1974	nfs4_unlock_state();
1975	return status;
1976	}
1977
1978
1979	/*
1980	* Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1981	* a description of SETCLIENTID_CONFIRM request processing consisting of 4
1982	* bullets, labeled as CASE1 - CASE4 below.
1983	*/
1984	__be32
1985	nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1986	struct nfsd4_compound_state *cstate,
1987	struct nfsd4_setclientid_confirm *setclientid_confirm)
1988	{
1989	struct sockaddr *sa = svc_addr(rqstp);
1990	struct nfs4_client conf, unconf;
1991	nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1992	clientid_t * clid = &setclientid_confirm->sc_clientid;
1993	__be32 status;
1994
1995	if (STALE_CLIENTID(clid))
1996	return nfserr_stale_clientid;
1997	/*
1998	* XXX The Duplicate Request Cache (DRC) has been checked (??)
1999	* We get here on a DRC miss.
2000	*/
2001
2002	nfs4_lock_state();
2003
2004	conf = find_confirmed_client(clid);
2005	unconf = find_unconfirmed_client(clid);
2006
2007	status = nfserr_clid_inuse;
2008	if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
2009	goto out;
2010	if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
2011	goto out;
2012
2013	/*
2014	* section 14.2.34 of RFC 3530 has a description of
2015	* SETCLIENTID_CONFIRM request processing consisting
2016	* of 4 bullet points, labeled as CASE1 - CASE4 below.
2017	*/
2018	if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
2019	/*
2020	* RFC 3530 14.2.34 CASE 1:
2021	* callback update
2022	*/
2023	if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
2024	status = nfserr_clid_inuse;
2025	else {
2026	nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2027	nfsd4_probe_callback(conf);
2028	expire_client(unconf);
2029	status = nfs_ok;
2030
2031	}
2032	} else if (conf && !unconf) {
2033	/*
2034	* RFC 3530 14.2.34 CASE 2:
2035	* probable retransmitted request; play it safe and
2036	* do nothing.
2037	*/
2038	if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
2039	status = nfserr_clid_inuse;
2040	else
2041	status = nfs_ok;
2042	} else if (!conf && unconf
2043	&& same_verf(&unconf->cl_confirm, &confirm)) {
2044	/*
2045	* RFC 3530 14.2.34 CASE 3:
2046	* Normal case; new or rebooted client:
2047	*/
2048	if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
2049	status = nfserr_clid_inuse;
2050	} else {
2051	unsigned int hash =
2052	clientstr_hashval(unconf->cl_recdir);
2053	conf = find_confirmed_client_by_str(unconf->cl_recdir,
2054	hash);
2055	if (conf) {
2056	nfsd4_remove_clid_dir(conf);
2057	expire_client(conf);
2058	}
2059	move_to_confirmed(unconf);
2060	conf = unconf;
2061	nfsd4_probe_callback(conf);
2062	status = nfs_ok;
2063	}
2064	} else if ((!conf \|\| (conf && !same_verf(&conf->cl_confirm, &confirm)))
2065	&& (!unconf \|\| (unconf && !same_verf(&unconf->cl_confirm,
2066	&confirm)))) {
2067	/*
2068	* RFC 3530 14.2.34 CASE 4:
2069	* Client probably hasn't noticed that we rebooted yet.
2070	*/
2071	status = nfserr_stale_clientid;
2072	} else {
2073	/* check that we have hit one of the cases...*/
2074	status = nfserr_clid_inuse;
2075	}
2076	out:
2077	nfs4_unlock_state();
2078	return status;
2079	}
2080
2081	/* OPEN Share state helper functions */
2082	static inline struct nfs4_file *
2083	alloc_init_file(struct inode *ino)
2084	{
2085	struct nfs4_file *fp;
2086	unsigned int hashval = file_hashval(ino);
2087
2088	fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
2089	if (fp) {
2090	atomic_set(&fp->fi_ref, 1);
2091	INIT_LIST_HEAD(&fp->fi_hash);
2092	INIT_LIST_HEAD(&fp->fi_stateids);
2093	INIT_LIST_HEAD(&fp->fi_delegations);
2094	fp->fi_inode = igrab(ino);
2095	fp->fi_id = current_fileid++;
2096	fp->fi_had_conflict = false;
2097	fp->fi_lease = NULL;
2098	memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2099	memset(fp->fi_access, 0, sizeof(fp->fi_access));
2100	spin_lock(&recall_lock);
2101	list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2102	spin_unlock(&recall_lock);
2103	return fp;
2104	}
2105	return NULL;
2106	}
2107
2108	static void
2109	nfsd4_free_slab(struct kmem_cache **slab)
2110	{
2111	if (*slab == NULL)
2112	return;
2113	kmem_cache_destroy(*slab);
2114	*slab = NULL;
2115	}
2116
2117	void
2118	nfsd4_free_slabs(void)
2119	{
2120	nfsd4_free_slab(&stateowner_slab);
2121	nfsd4_free_slab(&file_slab);
2122	nfsd4_free_slab(&stateid_slab);
2123	nfsd4_free_slab(&deleg_slab);
2124	}
2125
2126	static int
2127	nfsd4_init_slabs(void)
2128	{
2129	stateowner_slab = kmem_cache_create("nfsd4_stateowners",
2130	sizeof(struct nfs4_stateowner), 0, 0, NULL);
2131	if (stateowner_slab == NULL)
2132	goto out_nomem;
2133	file_slab = kmem_cache_create("nfsd4_files",
2134	sizeof(struct nfs4_file), 0, 0, NULL);
2135	if (file_slab == NULL)
2136	goto out_nomem;
2137	stateid_slab = kmem_cache_create("nfsd4_stateids",
2138	sizeof(struct nfs4_stateid), 0, 0, NULL);
2139	if (stateid_slab == NULL)
2140	goto out_nomem;
2141	deleg_slab = kmem_cache_create("nfsd4_delegations",
2142	sizeof(struct nfs4_delegation), 0, 0, NULL);
2143	if (deleg_slab == NULL)
2144	goto out_nomem;
2145	return 0;
2146	out_nomem:
2147	nfsd4_free_slabs();
2148	dprintk("nfsd4: out of memory while initializing nfsv4\n");
2149	return -ENOMEM;
2150	}
2151
2152	void
2153	nfs4_free_stateowner(struct kref *kref)
2154	{
2155	struct nfs4_stateowner *sop =
2156	container_of(kref, struct nfs4_stateowner, so_ref);
2157	kfree(sop->so_owner.data);
2158	kmem_cache_free(stateowner_slab, sop);
2159	}
2160
2161	static inline struct nfs4_stateowner *
2162	alloc_stateowner(struct xdr_netobj *owner)
2163	{
2164	struct nfs4_stateowner *sop;
2165
2166	if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
2167	if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
2168	memcpy(sop->so_owner.data, owner->data, owner->len);
2169	sop->so_owner.len = owner->len;
2170	kref_init(&sop->so_ref);
2171	return sop;
2172	}
2173	kmem_cache_free(stateowner_slab, sop);
2174	}
2175	return NULL;
2176	}
2177
2178	static struct nfs4_stateowner *
2179	alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client clp, struct nfsd4_open open) {
2180	struct nfs4_stateowner *sop;
2181	struct nfs4_replay *rp;
2182	unsigned int idhashval;
2183
2184	if (!(sop = alloc_stateowner(&open->op_owner)))
2185	return NULL;
2186	idhashval = ownerid_hashval(current_ownerid);
2187	INIT_LIST_HEAD(&sop->so_idhash);
2188	INIT_LIST_HEAD(&sop->so_strhash);
2189	INIT_LIST_HEAD(&sop->so_perclient);
2190	INIT_LIST_HEAD(&sop->so_stateids);
2191	INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
2192	INIT_LIST_HEAD(&sop->so_close_lru);
2193	sop->so_time = 0;
2194	list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
2195	list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
2196	list_add(&sop->so_perclient, &clp->cl_openowners);
2197	sop->so_is_open_owner = 1;
2198	sop->so_id = current_ownerid++;
2199	sop->so_client = clp;
2200	sop->so_seqid = open->op_seqid;
2201	sop->so_confirmed = 0;
2202	rp = &sop->so_replay;
2203	rp->rp_status = nfserr_serverfault;
2204	rp->rp_buflen = 0;
2205	rp->rp_buf = rp->rp_ibuf;
2206	return sop;
2207	}
2208
2209	static inline void
2210	init_stateid(struct nfs4_stateid stp, struct nfs4_file fp, struct nfsd4_open *open) {
2211	struct nfs4_stateowner *sop = open->op_stateowner;
2212	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2213
2214	INIT_LIST_HEAD(&stp->st_hash);
2215	INIT_LIST_HEAD(&stp->st_perstateowner);
2216	INIT_LIST_HEAD(&stp->st_lockowners);
2217	INIT_LIST_HEAD(&stp->st_perfile);
2218	list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
2219	list_add(&stp->st_perstateowner, &sop->so_stateids);
2220	list_add(&stp->st_perfile, &fp->fi_stateids);
2221	stp->st_stateowner = sop;
2222	get_nfs4_file(fp);
2223	stp->st_file = fp;
2224	stp->st_stateid.si_boot = boot_time;
2225	stp->st_stateid.si_stateownerid = sop->so_id;
2226	stp->st_stateid.si_fileid = fp->fi_id;
2227	stp->st_stateid.si_generation = 0;
2228	stp->st_access_bmap = 0;
2229	stp->st_deny_bmap = 0;
2230	__set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
2231	&stp->st_access_bmap);
2232	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
2233	stp->st_openstp = NULL;
2234	}
2235
2236	static void
2237	move_to_close_lru(struct nfs4_stateowner *sop)
2238	{
2239	dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
2240
2241	list_move_tail(&sop->so_close_lru, &close_lru);
2242	sop->so_time = get_seconds();
2243	}
2244
2245	static int
2246	same_owner_str(struct nfs4_stateowner sop, struct xdr_netobj owner,
2247	clientid_t *clid)
2248	{
2249	return (sop->so_owner.len == owner->len) &&
2250	0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2251	(sop->so_client->cl_clientid.cl_id == clid->cl_id);
2252	}
2253
2254	static struct nfs4_stateowner *
2255	find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2256	{
2257	struct nfs4_stateowner *so = NULL;
2258
2259	list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2260	if (same_owner_str(so, &open->op_owner, &open->op_clientid))
2261	return so;
2262	}
2263	return NULL;
2264	}
2265
2266	/* search file_hashtbl[] for file */
2267	static struct nfs4_file *
2268	find_file(struct inode *ino)
2269	{
2270	unsigned int hashval = file_hashval(ino);
2271	struct nfs4_file *fp;
2272
2273	spin_lock(&recall_lock);
2274	list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2275	if (fp->fi_inode == ino) {
2276	get_nfs4_file(fp);
2277	spin_unlock(&recall_lock);
2278	return fp;
2279	}
2280	}
2281	spin_unlock(&recall_lock);
2282	return NULL;
2283	}
2284
2285	static inline int access_valid(u32 x, u32 minorversion)
2286	{
2287	if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
2288	return 0;
2289	if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
2290	return 0;
2291	x &= ~NFS4_SHARE_ACCESS_MASK;
2292	if (minorversion && x) {
2293	if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
2294	return 0;
2295	if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
2296	return 0;
2297	x &= ~(NFS4_SHARE_WANT_MASK \| NFS4_SHARE_WHEN_MASK);
2298	}
2299	if (x)
2300	return 0;
2301	return 1;
2302	}
2303
2304	static inline int deny_valid(u32 x)
2305	{
2306	/* Note: unlike access bits, deny bits may be zero. */
2307	return x <= NFS4_SHARE_DENY_BOTH;
2308	}
2309
2310	/*
2311	* Called to check deny when READ with all zero stateid or
2312	* WRITE with all zero or all one stateid
2313	*/
2314	static __be32
2315	nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2316	{
2317	struct inode *ino = current_fh->fh_dentry->d_inode;
2318	struct nfs4_file *fp;
2319	struct nfs4_stateid *stp;
2320	__be32 ret;
2321
2322	dprintk("NFSD: nfs4_share_conflict\n");
2323
2324	fp = find_file(ino);
2325	if (!fp)
2326	return nfs_ok;
2327	ret = nfserr_locked;
2328	/* Search for conflicting share reservations */
2329	list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2330	if (test_bit(deny_type, &stp->st_deny_bmap) \|\|
2331	test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2332	goto out;
2333	}
2334	ret = nfs_ok;
2335	out:
2336	put_nfs4_file(fp);
2337	return ret;
2338	}
2339
2340	static inline void
2341	nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access)
2342	{
2343	if (share_access & NFS4_SHARE_ACCESS_WRITE)
2344	nfs4_file_put_access(fp, O_WRONLY);
2345	if (share_access & NFS4_SHARE_ACCESS_READ)
2346	nfs4_file_put_access(fp, O_RDONLY);
2347	}
2348
2349	static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2350	{
2351	/* We're assuming the state code never drops its reference
2352	* without first removing the lease. Since we're in this lease
2353	* callback (and since the lease code is serialized by the kernel
2354	* lock) we know the server hasn't removed the lease yet, we know
2355	* it's safe to take a reference: */
2356	atomic_inc(&dp->dl_count);
2357
2358	list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2359
2360	/* only place dl_time is set. protected by lock_flocks*/
2361	dp->dl_time = get_seconds();
2362
2363	nfsd4_cb_recall(dp);
2364	}
2365
2366	/* Called from break_lease() with lock_flocks() held. */
2367	static void nfsd_break_deleg_cb(struct file_lock *fl)
2368	{
2369	struct nfs4_file fp = (struct nfs4_file )fl->fl_owner;
2370	struct nfs4_delegation *dp;
2371
2372	BUG_ON(!fp);
2373	/* We assume break_lease is only called once per lease: */
2374	BUG_ON(fp->fi_had_conflict);
2375	/*
2376	* We don't want the locks code to timeout the lease for us;
2377	* we'll remove it ourself if a delegation isn't returned
2378	* in time:
2379	*/
2380	fl->fl_break_time = 0;
2381
2382	spin_lock(&recall_lock);
2383	fp->fi_had_conflict = true;
2384	list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2385	nfsd_break_one_deleg(dp);
2386	spin_unlock(&recall_lock);
2387	}
2388
2389	static
2390	int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2391	{
2392	if (arg & F_UNLCK)
2393	return lease_modify(onlist, arg);
2394	else
2395	return -EAGAIN;
2396	}
2397
2398	static const struct lock_manager_operations nfsd_lease_mng_ops = {
2399	.fl_break = nfsd_break_deleg_cb,
2400	.fl_change = nfsd_change_deleg_cb,
2401	};
2402
2403
2404	__be32
2405	nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2406	struct nfsd4_open *open)
2407	{
2408	clientid_t *clientid = &open->op_clientid;
2409	struct nfs4_client *clp = NULL;
2410	unsigned int strhashval;
2411	struct nfs4_stateowner *sop = NULL;
2412
2413	if (!check_name(open->op_owner))
2414	return nfserr_inval;
2415
2416	if (STALE_CLIENTID(&open->op_clientid))
2417	return nfserr_stale_clientid;
2418
2419	strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2420	sop = find_openstateowner_str(strhashval, open);
2421	open->op_stateowner = sop;
2422	if (!sop) {
2423	/* Make sure the client's lease hasn't expired. */
2424	clp = find_confirmed_client(clientid);
2425	if (clp == NULL)
2426	return nfserr_expired;
2427	goto renew;
2428	}
2429	/* When sessions are used, skip open sequenceid processing */
2430	if (nfsd4_has_session(cstate))
2431	goto renew;
2432	if (!sop->so_confirmed) {
2433	/* Replace unconfirmed owners without checking for replay. */
2434	clp = sop->so_client;
2435	release_openowner(sop);
2436	open->op_stateowner = NULL;
2437	goto renew;
2438	}
2439	if (open->op_seqid == sop->so_seqid - 1) {
2440	if (sop->so_replay.rp_buflen)
2441	return nfserr_replay_me;
2442	/* The original OPEN failed so spectacularly
2443	* that we don't even have replay data saved!
2444	* Therefore, we have no choice but to continue
2445	* processing this OPEN; presumably, we'll
2446	* fail again for the same reason.
2447	*/
2448	dprintk("nfsd4_process_open1: replay with no replay cache\n");
2449	goto renew;
2450	}
2451	if (open->op_seqid != sop->so_seqid)
2452	return nfserr_bad_seqid;
2453	renew:
2454	if (open->op_stateowner == NULL) {
2455	sop = alloc_init_open_stateowner(strhashval, clp, open);
2456	if (sop == NULL)
2457	return nfserr_resource;
2458	open->op_stateowner = sop;
2459	}
2460	list_del_init(&sop->so_close_lru);
2461	renew_client(sop->so_client);
2462	return nfs_ok;
2463	}
2464
2465	static inline __be32
2466	nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2467	{
2468	if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2469	return nfserr_openmode;
2470	else
2471	return nfs_ok;
2472	}
2473
2474	static struct nfs4_delegation *
2475	find_delegation_file(struct nfs4_file fp, stateid_t stid)
2476	{
2477	struct nfs4_delegation *dp;
2478
2479	spin_lock(&recall_lock);
2480	list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2481	if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) {
2482	spin_unlock(&recall_lock);
2483	return dp;
2484	}
2485	spin_unlock(&recall_lock);
2486	return NULL;
2487	}
2488
2489	static int share_access_to_flags(u32 share_access)
2490	{
2491	share_access &= ~NFS4_SHARE_WANT_MASK;
2492
2493	return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2494	}
2495
2496	static __be32
2497	nfs4_check_deleg(struct nfs4_file fp, struct nfsd4_open open,
2498	struct nfs4_delegation **dp)
2499	{
2500	int flags;
2501	__be32 status = nfserr_bad_stateid;
2502
2503	*dp = find_delegation_file(fp, &open->op_delegate_stateid);
2504	if (*dp == NULL)
2505	goto out;
2506	flags = share_access_to_flags(open->op_share_access);
2507	status = nfs4_check_delegmode(*dp, flags);
2508	if (status)
2509	*dp = NULL;
2510	out:
2511	if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2512	return nfs_ok;
2513	if (status)
2514	return status;
2515	open->op_stateowner->so_confirmed = 1;
2516	return nfs_ok;
2517	}
2518
2519	static __be32
2520	nfs4_check_open(struct nfs4_file fp, struct nfsd4_open open, struct nfs4_stateid **stpp)
2521	{
2522	struct nfs4_stateid *local;
2523	__be32 status = nfserr_share_denied;
2524	struct nfs4_stateowner *sop = open->op_stateowner;
2525
2526	list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2527	/* ignore lock owners */
2528	if (local->st_stateowner->so_is_open_owner == 0)
2529	continue;
2530	/* remember if we have seen this open owner */
2531	if (local->st_stateowner == sop)
2532	*stpp = local;
2533	/* check for conflicting share reservations */
2534	if (!test_share(local, open))
2535	goto out;
2536	}
2537	status = 0;
2538	out:
2539	return status;
2540	}
2541
2542	static inline struct nfs4_stateid *
2543	nfs4_alloc_stateid(void)
2544	{
2545	return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2546	}
2547
2548	static inline int nfs4_access_to_access(u32 nfs4_access)
2549	{
2550	int flags = 0;
2551
2552	if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2553	flags \|= NFSD_MAY_READ;
2554	if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2555	flags \|= NFSD_MAY_WRITE;
2556	return flags;
2557	}
2558
2559	static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file
2560	fp, struct svc_fh cur_fh, u32 nfs4_access)
2561	{
2562	__be32 status;
2563	int oflag = nfs4_access_to_omode(nfs4_access);
2564	int access = nfs4_access_to_access(nfs4_access);
2565
2566	if (!fp->fi_fds[oflag]) {
2567	status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2568	&fp->fi_fds[oflag]);
2569	if (status)
2570	return status;
2571	}
2572	nfs4_file_get_access(fp, oflag);
2573
2574	return nfs_ok;
2575	}
2576
2577	static __be32
2578	nfs4_new_open(struct svc_rqst rqstp, struct nfs4_stateid *stpp,
2579	struct nfs4_file fp, struct svc_fh cur_fh,
2580	struct nfsd4_open *open)
2581	{
2582	struct nfs4_stateid *stp;
2583	__be32 status;
2584
2585	stp = nfs4_alloc_stateid();
2586	if (stp == NULL)
2587	return nfserr_resource;
2588
2589	status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access);
2590	if (status) {
2591	kmem_cache_free(stateid_slab, stp);
2592	return status;
2593	}
2594	*stpp = stp;
2595	return 0;
2596	}
2597
2598	static inline __be32
2599	nfsd4_truncate(struct svc_rqst rqstp, struct svc_fh fh,
2600	struct nfsd4_open *open)
2601	{
2602	struct iattr iattr = {
2603	.ia_valid = ATTR_SIZE,
2604	.ia_size = 0,
2605	};
2606	if (!open->op_truncate)
2607	return 0;
2608	if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2609	return nfserr_inval;
2610	return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2611	}
2612
2613	static __be32
2614	nfs4_upgrade_open(struct svc_rqst rqstp, struct nfs4_file fp, struct svc_fh cur_fh, struct nfs4_stateid stp, struct nfsd4_open *open)
2615	{
2616	u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;
2617	bool new_access;
2618	__be32 status;
2619
2620	new_access = !test_bit(op_share_access, &stp->st_access_bmap);
2621	if (new_access) {
2622	status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access);
2623	if (status)
2624	return status;
2625	}
2626	status = nfsd4_truncate(rqstp, cur_fh, open);
2627	if (status) {
2628	if (new_access) {
2629	int oflag = nfs4_access_to_omode(new_access);
2630	nfs4_file_put_access(fp, oflag);
2631	}
2632	return status;
2633	}
2634	/* remember the open */
2635	__set_bit(op_share_access, &stp->st_access_bmap);
2636	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
2637
2638	return nfs_ok;
2639	}
2640
2641
2642	static void
2643	nfs4_set_claim_prev(struct nfsd4_open *open)
2644	{
2645	open->op_stateowner->so_confirmed = 1;
2646	open->op_stateowner->so_client->cl_firststate = 1;
2647	}
2648
2649	/* Should we give out recallable state?: */
2650	static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2651	{
2652	if (clp->cl_cb_state == NFSD4_CB_UP)
2653	return true;
2654	/*
2655	* In the sessions case, since we don't have to establish a
2656	* separate connection for callbacks, we assume it's OK
2657	* until we hear otherwise:
2658	*/
2659	return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2660	}
2661
2662	static struct file_lock nfs4_alloc_init_lease(struct nfs4_delegation dp, int flag)
2663	{
2664	struct file_lock *fl;
2665
2666	fl = locks_alloc_lock();
2667	if (!fl)
2668	return NULL;
2669	locks_init_lock(fl);
2670	fl->fl_lmops = &nfsd_lease_mng_ops;
2671	fl->fl_flags = FL_LEASE;
2672	fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2673	fl->fl_end = OFFSET_MAX;
2674	fl->fl_owner = (fl_owner_t)(dp->dl_file);
2675	fl->fl_pid = current->tgid;
2676	return fl;
2677	}
2678
2679	static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2680	{
2681	struct nfs4_file *fp = dp->dl_file;
2682	struct file_lock *fl;
2683	int status;
2684
2685	fl = nfs4_alloc_init_lease(dp, flag);
2686	if (!fl)
2687	return -ENOMEM;
2688	fl->fl_file = find_readable_file(fp);
2689	list_add(&dp->dl_perclnt, &dp->dl_client->cl_delegations);
2690	status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2691	if (status) {
2692	list_del_init(&dp->dl_perclnt);
2693	locks_free_lock(fl);
2694	return -ENOMEM;
2695	}
2696	fp->fi_lease = fl;
2697	fp->fi_deleg_file = fl->fl_file;
2698	get_file(fp->fi_deleg_file);
2699	atomic_set(&fp->fi_delegees, 1);
2700	list_add(&dp->dl_perfile, &fp->fi_delegations);
2701	return 0;
2702	}
2703
2704	static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2705	{
2706	struct nfs4_file *fp = dp->dl_file;
2707
2708	if (!fp->fi_lease)
2709	return nfs4_setlease(dp, flag);
2710	spin_lock(&recall_lock);
2711	if (fp->fi_had_conflict) {
2712	spin_unlock(&recall_lock);
2713	return -EAGAIN;
2714	}
2715	atomic_inc(&fp->fi_delegees);
2716	list_add(&dp->dl_perfile, &fp->fi_delegations);
2717	spin_unlock(&recall_lock);
2718	list_add(&dp->dl_perclnt, &dp->dl_client->cl_delegations);
2719	return 0;
2720	}
2721
2722	/*
2723	* Attempt to hand out a delegation.
2724	*/
2725	static void
2726	nfs4_open_delegation(struct svc_fh fh, struct nfsd4_open open, struct nfs4_stateid *stp)
2727	{
2728	struct nfs4_delegation *dp;
2729	struct nfs4_stateowner *sop = stp->st_stateowner;
2730	int cb_up;
2731	int status, flag = 0;
2732
2733	cb_up = nfsd4_cb_channel_good(sop->so_client);
2734	flag = NFS4_OPEN_DELEGATE_NONE;
2735	open->op_recall = 0;
2736	switch (open->op_claim_type) {
2737	case NFS4_OPEN_CLAIM_PREVIOUS:
2738	if (!cb_up)
2739	open->op_recall = 1;
2740	flag = open->op_delegate_type;
2741	if (flag == NFS4_OPEN_DELEGATE_NONE)
2742	goto out;
2743	break;
2744	case NFS4_OPEN_CLAIM_NULL:
2745	/* Let's not give out any delegations till everyone's
2746	* had the chance to reclaim theirs.... */
2747	if (locks_in_grace())
2748	goto out;
2749	if (!cb_up \|\| !sop->so_confirmed)
2750	goto out;
2751	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2752	flag = NFS4_OPEN_DELEGATE_WRITE;
2753	else
2754	flag = NFS4_OPEN_DELEGATE_READ;
2755	break;
2756	default:
2757	goto out;
2758	}
2759
2760	dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2761	if (dp == NULL)
2762	goto out_no_deleg;
2763	status = nfs4_set_delegation(dp, flag);
2764	if (status)
2765	goto out_free;
2766
2767	memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2768
2769	dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2770	STATEID_VAL(&dp->dl_stateid));
2771	out:
2772	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2773	&& flag == NFS4_OPEN_DELEGATE_NONE
2774	&& open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2775	dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2776	open->op_delegate_type = flag;
2777	return;
2778	out_free:
2779	nfs4_put_delegation(dp);
2780	out_no_deleg:
2781	flag = NFS4_OPEN_DELEGATE_NONE;
2782	goto out;
2783	}
2784
2785	/*
2786	* called with nfs4_lock_state() held.
2787	*/
2788	__be32
2789	nfsd4_process_open2(struct svc_rqst rqstp, struct svc_fh current_fh, struct nfsd4_open *open)
2790	{
2791	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2792	struct nfs4_file *fp = NULL;
2793	struct inode *ino = current_fh->fh_dentry->d_inode;
2794	struct nfs4_stateid *stp = NULL;
2795	struct nfs4_delegation *dp = NULL;
2796	__be32 status;
2797
2798	status = nfserr_inval;
2799	if (!access_valid(open->op_share_access, resp->cstate.minorversion)
2800	\|\| !deny_valid(open->op_share_deny))
2801	goto out;
2802	/*
2803	* Lookup file; if found, lookup stateid and check open request,
2804	* and check for delegations in the process of being recalled.
2805	* If not found, create the nfs4_file struct
2806	*/
2807	fp = find_file(ino);
2808	if (fp) {
2809	if ((status = nfs4_check_open(fp, open, &stp)))
2810	goto out;
2811	status = nfs4_check_deleg(fp, open, &dp);
2812	if (status)
2813	goto out;
2814	} else {
2815	status = nfserr_bad_stateid;
2816	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2817	goto out;
2818	status = nfserr_resource;
2819	fp = alloc_init_file(ino);
2820	if (fp == NULL)
2821	goto out;
2822	}
2823
2824	/*
2825	* OPEN the file, or upgrade an existing OPEN.
2826	* If truncate fails, the OPEN fails.
2827	*/
2828	if (stp) {
2829	/* Stateid was found, this is an OPEN upgrade */
2830	status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
2831	if (status)
2832	goto out;
2833	update_stateid(&stp->st_stateid);
2834	} else {
2835	status = nfs4_new_open(rqstp, &stp, fp, current_fh, open);
2836	if (status)
2837	goto out;
2838	init_stateid(stp, fp, open);
2839	status = nfsd4_truncate(rqstp, current_fh, open);
2840	if (status) {
2841	release_open_stateid(stp);
2842	goto out;
2843	}
2844	if (nfsd4_has_session(&resp->cstate))
2845	update_stateid(&stp->st_stateid);
2846	}
2847	memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2848
2849	if (nfsd4_has_session(&resp->cstate))
2850	open->op_stateowner->so_confirmed = 1;
2851
2852	/*
2853	* Attempt to hand out a delegation. No error return, because the
2854	* OPEN succeeds even if we fail.
2855	*/
2856	nfs4_open_delegation(current_fh, open, stp);
2857
2858	status = nfs_ok;
2859
2860	dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2861	STATEID_VAL(&stp->st_stateid));
2862	out:
2863	if (fp)
2864	put_nfs4_file(fp);
2865	if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2866	nfs4_set_claim_prev(open);
2867	/*
2868	* To finish the open response, we just need to set the rflags.
2869	*/
2870	open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2871	if (!open->op_stateowner->so_confirmed &&
2872	!nfsd4_has_session(&resp->cstate))
2873	open->op_rflags \|= NFS4_OPEN_RESULT_CONFIRM;
2874
2875	return status;
2876	}
2877
2878	__be32
2879	nfsd4_renew(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
2880	clientid_t *clid)
2881	{
2882	struct nfs4_client *clp;
2883	__be32 status;
2884
2885	nfs4_lock_state();
2886	dprintk("process_renew(%08x/%08x): starting\n",
2887	clid->cl_boot, clid->cl_id);
2888	status = nfserr_stale_clientid;
2889	if (STALE_CLIENTID(clid))
2890	goto out;
2891	clp = find_confirmed_client(clid);
2892	status = nfserr_expired;
2893	if (clp == NULL) {
2894	/* We assume the client took too long to RENEW. */
2895	dprintk("nfsd4_renew: clientid not found!\n");
2896	goto out;
2897	}
2898	renew_client(clp);
2899	status = nfserr_cb_path_down;
2900	if (!list_empty(&clp->cl_delegations)
2901	&& clp->cl_cb_state != NFSD4_CB_UP)
2902	goto out;
2903	status = nfs_ok;
2904	out:
2905	nfs4_unlock_state();
2906	return status;
2907	}
2908
2909	static struct lock_manager nfsd4_manager = {
2910	};
2911
2912	static void
2913	nfsd4_end_grace(void)
2914	{
2915	dprintk("NFSD: end of grace period\n");
2916	nfsd4_recdir_purge_old();
2917	locks_end_grace(&nfsd4_manager);
2918	/*
2919	* Now that every NFSv4 client has had the chance to recover and
2920	* to see the (possibly new, possibly shorter) lease time, we
2921	* can safely set the next grace time to the current lease time:
2922	*/
2923	nfsd4_grace = nfsd4_lease;
2924	}
2925
2926	static time_t
2927	nfs4_laundromat(void)
2928	{
2929	struct nfs4_client *clp;
2930	struct nfs4_stateowner *sop;
2931	struct nfs4_delegation *dp;
2932	struct list_head pos, next, reaplist;
2933	time_t cutoff = get_seconds() - nfsd4_lease;
2934	time_t t, clientid_val = nfsd4_lease;
2935	time_t u, test_val = nfsd4_lease;
2936
2937	nfs4_lock_state();
2938
2939	dprintk("NFSD: laundromat service - starting\n");
2940	if (locks_in_grace())
2941	nfsd4_end_grace();
2942	INIT_LIST_HEAD(&reaplist);
2943	spin_lock(&client_lock);
2944	list_for_each_safe(pos, next, &client_lru) {
2945	clp = list_entry(pos, struct nfs4_client, cl_lru);
2946	if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2947	t = clp->cl_time - cutoff;
2948	if (clientid_val > t)
2949	clientid_val = t;
2950	break;
2951	}
2952	if (atomic_read(&clp->cl_refcount)) {
2953	dprintk("NFSD: client in use (clientid %08x)\n",
2954	clp->cl_clientid.cl_id);
2955	continue;
2956	}
2957	unhash_client_locked(clp);
2958	list_add(&clp->cl_lru, &reaplist);
2959	}
2960	spin_unlock(&client_lock);
2961	list_for_each_safe(pos, next, &reaplist) {
2962	clp = list_entry(pos, struct nfs4_client, cl_lru);
2963	dprintk("NFSD: purging unused client (clientid %08x)\n",
2964	clp->cl_clientid.cl_id);
2965	nfsd4_remove_clid_dir(clp);
2966	expire_client(clp);
2967	}
2968	spin_lock(&recall_lock);
2969	list_for_each_safe(pos, next, &del_recall_lru) {
2970	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2971	if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2972	u = dp->dl_time - cutoff;
2973	if (test_val > u)
2974	test_val = u;
2975	break;
2976	}
2977	list_move(&dp->dl_recall_lru, &reaplist);
2978	}
2979	spin_unlock(&recall_lock);
2980	list_for_each_safe(pos, next, &reaplist) {
2981	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2982	list_del_init(&dp->dl_recall_lru);
2983	unhash_delegation(dp);
2984	}
2985	test_val = nfsd4_lease;
2986	list_for_each_safe(pos, next, &close_lru) {
2987	sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2988	if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2989	u = sop->so_time - cutoff;
2990	if (test_val > u)
2991	test_val = u;
2992	break;
2993	}
2994	dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2995	sop->so_id);
2996	release_openowner(sop);
2997	}
2998	if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2999	clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3000	nfs4_unlock_state();
3001	return clientid_val;
3002	}
3003
3004	static struct workqueue_struct *laundry_wq;
3005	static void laundromat_main(struct work_struct *);
3006	static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3007
3008	static void
3009	laundromat_main(struct work_struct *not_used)
3010	{
3011	time_t t;
3012
3013	t = nfs4_laundromat();
3014	dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3015	queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3016	}
3017
3018	static struct nfs4_stateowner *
3019	search_close_lru(u32 st_id, int flags)
3020	{
3021	struct nfs4_stateowner *local = NULL;
3022
3023	if (flags & CLOSE_STATE) {
3024	list_for_each_entry(local, &close_lru, so_close_lru) {
3025	if (local->so_id == st_id)
3026	return local;
3027	}
3028	}
3029	return NULL;
3030	}
3031
3032	static inline int
3033	nfs4_check_fh(struct svc_fh fhp, struct nfs4_stateid stp)
3034	{
3035	return fhp->fh_dentry->d_inode != stp->st_file->fi_inode;
3036	}
3037
3038	static int
3039	STALE_STATEID(stateid_t *stateid)
3040	{
3041	if (stateid->si_boot == boot_time)
3042	return 0;
3043	dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3044	STATEID_VAL(stateid));
3045	return 1;
3046	}
3047
3048	static inline int
3049	access_permit_read(unsigned long access_bmap)
3050	{
3051	return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) \|\|
3052	test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) \|\|
3053	test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
3054	}
3055
3056	static inline int
3057	access_permit_write(unsigned long access_bmap)
3058	{
3059	return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) \|\|
3060	test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
3061	}
3062
3063	static
3064	__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
3065	{
3066	__be32 status = nfserr_openmode;
3067
3068	/* For lock stateid's, we test the parent open, not the lock: */
3069	if (stp->st_openstp)
3070	stp = stp->st_openstp;
3071	if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
3072	goto out;
3073	if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
3074	goto out;
3075	status = nfs_ok;
3076	out:
3077	return status;
3078	}
3079
3080	static inline __be32
3081	check_special_stateids(svc_fh current_fh, stateid_t stateid, int flags)
3082	{
3083	if (ONE_STATEID(stateid) && (flags & RD_STATE))
3084	return nfs_ok;
3085	else if (locks_in_grace()) {
3086	/* Answer in remaining cases depends on existence of
3087	* conflicting state; so we must wait out the grace period. */
3088	return nfserr_grace;
3089	} else if (flags & WR_STATE)
3090	return nfs4_share_conflict(current_fh,
3091	NFS4_SHARE_DENY_WRITE);
3092	else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3093	return nfs4_share_conflict(current_fh,
3094	NFS4_SHARE_DENY_READ);
3095	}
3096
3097	/*
3098	* Allow READ/WRITE during grace period on recovered state only for files
3099	* that are not able to provide mandatory locking.
3100	*/
3101	static inline int
3102	grace_disallows_io(struct inode *inode)
3103	{
3104	return locks_in_grace() && mandatory_lock(inode);
3105	}
3106
3107	static int check_stateid_generation(stateid_t in, stateid_t ref, int flags)
3108	{
3109	/*
3110	* When sessions are used the stateid generation number is ignored
3111	* when it is zero.
3112	*/
3113	if ((flags & HAS_SESSION) && in->si_generation == 0)
3114	goto out;
3115
3116	/* If the client sends us a stateid from the future, it's buggy: */
3117	if (in->si_generation > ref->si_generation)
3118	return nfserr_bad_stateid;
3119	/*
3120	* The following, however, can happen. For example, if the
3121	* client sends an open and some IO at the same time, the open
3122	* may bump si_generation while the IO is still in flight.
3123	* Thanks to hard links and renames, the client never knows what
3124	* file an open will affect. So it could avoid that situation
3125	* only by serializing all opens and IO from the same open
3126	* owner. To recover from the old_stateid error, the client
3127	* will just have to retry the IO:
3128	*/
3129	if (in->si_generation < ref->si_generation)
3130	return nfserr_old_stateid;
3131	out:
3132	return nfs_ok;
3133	}
3134
3135	static int is_delegation_stateid(stateid_t *stateid)
3136	{
3137	return stateid->si_fileid == 0;
3138	}
3139
3140	/*
3141	* Checks for stateid operations
3142	*/
3143	__be32
3144	nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3145	stateid_t stateid, int flags, struct file *filpp)
3146	{
3147	struct nfs4_stateid *stp = NULL;
3148	struct nfs4_delegation *dp = NULL;
3149	struct svc_fh *current_fh = &cstate->current_fh;
3150	struct inode *ino = current_fh->fh_dentry->d_inode;
3151	__be32 status;
3152
3153	if (filpp)
3154	*filpp = NULL;
3155
3156	if (grace_disallows_io(ino))
3157	return nfserr_grace;
3158
3159	if (nfsd4_has_session(cstate))
3160	flags \|= HAS_SESSION;
3161
3162	if (ZERO_STATEID(stateid) \|\| ONE_STATEID(stateid))
3163	return check_special_stateids(current_fh, stateid, flags);
3164
3165	status = nfserr_stale_stateid;
3166	if (STALE_STATEID(stateid))
3167	goto out;
3168
3169	/*
3170	* We assume that any stateid that has the current boot time,
3171	* but that we can't find, is expired:
3172	*/
3173	status = nfserr_expired;
3174	if (is_delegation_stateid(stateid)) {
3175	dp = find_delegation_stateid(ino, stateid);
3176	if (!dp)
3177	goto out;
3178	status = check_stateid_generation(stateid, &dp->dl_stateid,
3179	flags);
3180	if (status)
3181	goto out;
3182	status = nfs4_check_delegmode(dp, flags);
3183	if (status)
3184	goto out;
3185	renew_client(dp->dl_client);
3186	if (filpp) {
3187	*filpp = dp->dl_file->fi_deleg_file;
3188	BUG_ON(!*filpp);
3189	}
3190	} else { /* open or lock stateid */
3191	stp = find_stateid(stateid, flags);
3192	if (!stp)
3193	goto out;
3194	status = nfserr_bad_stateid;
3195	if (nfs4_check_fh(current_fh, stp))
3196	goto out;
3197	if (!stp->st_stateowner->so_confirmed)
3198	goto out;
3199	status = check_stateid_generation(stateid, &stp->st_stateid,
3200	flags);
3201	if (status)
3202	goto out;
3203	status = nfs4_check_openmode(stp, flags);
3204	if (status)
3205	goto out;
3206	renew_client(stp->st_stateowner->so_client);
3207	if (filpp) {
3208	if (flags & RD_STATE)
3209	*filpp = find_readable_file(stp->st_file);
3210	else
3211	*filpp = find_writeable_file(stp->st_file);
3212	}
3213	}
3214	status = nfs_ok;
3215	out:
3216	return status;
3217	}
3218
3219	static inline int
3220	setlkflg (int type)
3221	{
3222	return (type == NFS4_READW_LT \|\| type == NFS4_READ_LT) ?
3223	RD_STATE : WR_STATE;
3224	}
3225
3226	/*
3227	* Checks for sequence id mutating operations.
3228	*/
3229	static __be32
3230	nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3231	stateid_t *stateid, int flags,
3232	struct nfs4_stateowner **sopp,
3233	struct nfs4_stateid *stpp, struct nfsd4_lock lock)
3234	{
3235	struct nfs4_stateid *stp;
3236	struct nfs4_stateowner *sop;
3237	struct svc_fh *current_fh = &cstate->current_fh;
3238	__be32 status;
3239
3240	dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3241	seqid, STATEID_VAL(stateid));
3242
3243	*stpp = NULL;
3244	*sopp = NULL;
3245
3246	if (ZERO_STATEID(stateid) \|\| ONE_STATEID(stateid)) {
3247	dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3248	return nfserr_bad_stateid;
3249	}
3250
3251	if (STALE_STATEID(stateid))
3252	return nfserr_stale_stateid;
3253
3254	if (nfsd4_has_session(cstate))
3255	flags \|= HAS_SESSION;
3256
3257	/*
3258	* We return BAD_STATEID if filehandle doesn't match stateid,
3259	* the confirmed flag is incorrecly set, or the generation
3260	* number is incorrect.
3261	*/
3262	stp = find_stateid(stateid, flags);
3263	if (stp == NULL) {
3264	/*
3265	* Also, we should make sure this isn't just the result of
3266	* a replayed close:
3267	*/
3268	sop = search_close_lru(stateid->si_stateownerid, flags);
3269	/* It's not stale; let's assume it's expired: */
3270	if (sop == NULL)
3271	return nfserr_expired;
3272	*sopp = sop;
3273	goto check_replay;
3274	}
3275
3276	*stpp = stp;
3277	*sopp = sop = stp->st_stateowner;
3278
3279	if (lock) {
3280	clientid_t *lockclid = &lock->v.new.clientid;
3281	struct nfs4_client *clp = sop->so_client;
3282	int lkflg = 0;
3283	__be32 status;
3284
3285	lkflg = setlkflg(lock->lk_type);
3286
3287	if (lock->lk_is_new) {
3288	if (!sop->so_is_open_owner)
3289	return nfserr_bad_stateid;
3290	if (!(flags & HAS_SESSION) &&
3291	!same_clid(&clp->cl_clientid, lockclid))
3292	return nfserr_bad_stateid;
3293	/* stp is the open stateid */
3294	status = nfs4_check_openmode(stp, lkflg);
3295	if (status)
3296	return status;
3297	} else {
3298	/* stp is the lock stateid */
3299	status = nfs4_check_openmode(stp->st_openstp, lkflg);
3300	if (status)
3301	return status;
3302	}
3303	}
3304
3305	if (nfs4_check_fh(current_fh, stp)) {
3306	dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3307	return nfserr_bad_stateid;
3308	}
3309
3310	/*
3311	* We now validate the seqid and stateid generation numbers.
3312	* For the moment, we ignore the possibility of
3313	* generation number wraparound.
3314	*/
3315	if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
3316	goto check_replay;
3317
3318	if (sop->so_confirmed && flags & CONFIRM) {
3319	dprintk("NFSD: preprocess_seqid_op: expected"
3320	" unconfirmed stateowner!\n");
3321	return nfserr_bad_stateid;
3322	}
3323	if (!sop->so_confirmed && !(flags & CONFIRM)) {
3324	dprintk("NFSD: preprocess_seqid_op: stateowner not"
3325	" confirmed yet!\n");
3326	return nfserr_bad_stateid;
3327	}
3328	status = check_stateid_generation(stateid, &stp->st_stateid, flags);
3329	if (status)
3330	return status;
3331	renew_client(sop->so_client);
3332	return nfs_ok;
3333
3334	check_replay:
3335	if (seqid == sop->so_seqid - 1) {
3336	dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
3337	/* indicate replay to calling function */
3338	return nfserr_replay_me;
3339	}
3340	dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3341	sop->so_seqid, seqid);
3342	*sopp = NULL;
3343	return nfserr_bad_seqid;
3344	}
3345
3346	__be32
3347	nfsd4_open_confirm(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
3348	struct nfsd4_open_confirm *oc)
3349	{
3350	__be32 status;
3351	struct nfs4_stateowner *sop;
3352	struct nfs4_stateid *stp;
3353
3354	dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3355	(int)cstate->current_fh.fh_dentry->d_name.len,
3356	cstate->current_fh.fh_dentry->d_name.name);
3357
3358	status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3359	if (status)
3360	return status;
3361
3362	nfs4_lock_state();
3363
3364	if ((status = nfs4_preprocess_seqid_op(cstate,
3365	oc->oc_seqid, &oc->oc_req_stateid,
3366	CONFIRM \| OPEN_STATE,
3367	&oc->oc_stateowner, &stp, NULL)))
3368	goto out;
3369
3370	sop = oc->oc_stateowner;
3371	sop->so_confirmed = 1;
3372	update_stateid(&stp->st_stateid);
3373	memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3374	dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3375	__func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid));
3376
3377	nfsd4_create_clid_dir(sop->so_client);
3378	out:
3379	if (oc->oc_stateowner) {
3380	nfs4_get_stateowner(oc->oc_stateowner);
3381	cstate->replay_owner = oc->oc_stateowner;
3382	}
3383	nfs4_unlock_state();
3384	return status;
3385	}
3386
3387
3388	/*
3389	* unset all bits in union bitmap (bmap) that
3390	* do not exist in share (from successful OPEN_DOWNGRADE)
3391	*/
3392	static void
3393	reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3394	{
3395	int i;
3396	for (i = 1; i < 4; i++) {
3397	if ((i & access) != i)
3398	__clear_bit(i, bmap);
3399	}
3400	}
3401
3402	static void
3403	reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3404	{
3405	int i;
3406	for (i = 0; i < 4; i++) {
3407	if ((i & deny) != i)
3408	__clear_bit(i, bmap);
3409	}
3410	}
3411
3412	__be32
3413	nfsd4_open_downgrade(struct svc_rqst *rqstp,
3414	struct nfsd4_compound_state *cstate,
3415	struct nfsd4_open_downgrade *od)
3416	{
3417	__be32 status;
3418	struct nfs4_stateid *stp;
3419	unsigned int share_access;
3420
3421	dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3422	(int)cstate->current_fh.fh_dentry->d_name.len,
3423	cstate->current_fh.fh_dentry->d_name.name);
3424
3425	if (!access_valid(od->od_share_access, cstate->minorversion)
3426	\|\| !deny_valid(od->od_share_deny))
3427	return nfserr_inval;
3428
3429	nfs4_lock_state();
3430	if ((status = nfs4_preprocess_seqid_op(cstate,
3431	od->od_seqid,
3432	&od->od_stateid,
3433	OPEN_STATE,
3434	&od->od_stateowner, &stp, NULL)))
3435	goto out;
3436
3437	status = nfserr_inval;
3438	if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3439	dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3440	stp->st_access_bmap, od->od_share_access);
3441	goto out;
3442	}
3443	if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3444	dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3445	stp->st_deny_bmap, od->od_share_deny);
3446	goto out;
3447	}
3448	set_access(&share_access, stp->st_access_bmap);
3449	nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access);
3450
3451	reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3452	reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3453
3454	update_stateid(&stp->st_stateid);
3455	memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3456	status = nfs_ok;
3457	out:
3458	if (od->od_stateowner) {
3459	nfs4_get_stateowner(od->od_stateowner);
3460	cstate->replay_owner = od->od_stateowner;
3461	}
3462	nfs4_unlock_state();
3463	return status;
3464	}
3465
3466	/*
3467	* nfs4_unlock_state() called after encode
3468	*/
3469	__be32
3470	nfsd4_close(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
3471	struct nfsd4_close *close)
3472	{
3473	__be32 status;
3474	struct nfs4_stateid *stp;
3475
3476	dprintk("NFSD: nfsd4_close on file %.*s\n",
3477	(int)cstate->current_fh.fh_dentry->d_name.len,
3478	cstate->current_fh.fh_dentry->d_name.name);
3479
3480	nfs4_lock_state();
3481	/* check close_lru for replay */
3482	if ((status = nfs4_preprocess_seqid_op(cstate,
3483	close->cl_seqid,
3484	&close->cl_stateid,
3485	OPEN_STATE \| CLOSE_STATE,
3486	&close->cl_stateowner, &stp, NULL)))
3487	goto out;
3488	status = nfs_ok;
3489	update_stateid(&stp->st_stateid);
3490	memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3491
3492	/* release_stateid() calls nfsd_close() if needed */
3493	release_open_stateid(stp);
3494
3495	/* place unused nfs4_stateowners on so_close_lru list to be
3496	* released by the laundromat service after the lease period
3497	* to enable us to handle CLOSE replay
3498	*/
3499	if (list_empty(&close->cl_stateowner->so_stateids))
3500	move_to_close_lru(close->cl_stateowner);
3501	out:
3502	if (close->cl_stateowner) {
3503	nfs4_get_stateowner(close->cl_stateowner);
3504	cstate->replay_owner = close->cl_stateowner;
3505	}
3506	nfs4_unlock_state();
3507	return status;
3508	}
3509
3510	__be32
3511	nfsd4_delegreturn(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
3512	struct nfsd4_delegreturn *dr)
3513	{
3514	struct nfs4_delegation *dp;
3515	stateid_t *stateid = &dr->dr_stateid;
3516	struct inode *inode;
3517	__be32 status;
3518	int flags = 0;
3519
3520	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3521	return status;
3522	inode = cstate->current_fh.fh_dentry->d_inode;
3523
3524	if (nfsd4_has_session(cstate))
3525	flags \|= HAS_SESSION;
3526	nfs4_lock_state();
3527	status = nfserr_bad_stateid;
3528	if (ZERO_STATEID(stateid) \|\| ONE_STATEID(stateid))
3529	goto out;
3530	status = nfserr_stale_stateid;
3531	if (STALE_STATEID(stateid))
3532	goto out;
3533	status = nfserr_bad_stateid;
3534	if (!is_delegation_stateid(stateid))
3535	goto out;
3536	status = nfserr_expired;
3537	dp = find_delegation_stateid(inode, stateid);
3538	if (!dp)
3539	goto out;
3540	status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
3541	if (status)
3542	goto out;
3543	renew_client(dp->dl_client);
3544
3545	unhash_delegation(dp);
3546	out:
3547	nfs4_unlock_state();
3548
3549	return status;
3550	}
3551
3552
3553	/*
3554	* Lock owner state (byte-range locks)
3555	*/
3556	#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3557	#define LOCK_HASH_BITS 8
3558	#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3559	#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3560
3561	static inline u64
3562	end_offset(u64 start, u64 len)
3563	{
3564	u64 end;
3565
3566	end = start + len;
3567	return end >= start ? end: NFS4_MAX_UINT64;
3568	}
3569
3570	/* last octet in a range */
3571	static inline u64
3572	last_byte_offset(u64 start, u64 len)
3573	{
3574	u64 end;
3575
3576	BUG_ON(!len);
3577	end = start + len;
3578	return end > start ? end - 1: NFS4_MAX_UINT64;
3579	}
3580
3581	#define lockownerid_hashval(id) \
3582	((id) & LOCK_HASH_MASK)
3583
3584	static inline unsigned int
3585	lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3586	struct xdr_netobj *ownername)
3587	{
3588	return (file_hashval(inode) + cl_id
3589	+ opaque_hashval(ownername->data, ownername->len))
3590	& LOCK_HASH_MASK;
3591	}
3592
3593	static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3594	static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3595	static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3596
3597	static struct nfs4_stateid *
3598	find_stateid(stateid_t *stid, int flags)
3599	{
3600	struct nfs4_stateid *local;
3601	u32 st_id = stid->si_stateownerid;
3602	u32 f_id = stid->si_fileid;
3603	unsigned int hashval;
3604
3605	dprintk("NFSD: find_stateid flags 0x%x\n",flags);
3606	if (flags & (LOCK_STATE \| RD_STATE \| WR_STATE)) {
3607	hashval = stateid_hashval(st_id, f_id);
3608	list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3609	if ((local->st_stateid.si_stateownerid == st_id) &&
3610	(local->st_stateid.si_fileid == f_id))
3611	return local;
3612	}
3613	}
3614
3615	if (flags & (OPEN_STATE \| RD_STATE \| WR_STATE)) {
3616	hashval = stateid_hashval(st_id, f_id);
3617	list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3618	if ((local->st_stateid.si_stateownerid == st_id) &&
3619	(local->st_stateid.si_fileid == f_id))
3620	return local;
3621	}
3622	}
3623	return NULL;
3624	}
3625
3626	static struct nfs4_delegation *
3627	find_delegation_stateid(struct inode ino, stateid_t stid)
3628	{
3629	struct nfs4_file *fp;
3630	struct nfs4_delegation *dl;
3631
3632	dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__,
3633	STATEID_VAL(stid));
3634
3635	fp = find_file(ino);
3636	if (!fp)
3637	return NULL;
3638	dl = find_delegation_file(fp, stid);
3639	put_nfs4_file(fp);
3640	return dl;
3641	}
3642
3643	/*
3644	* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3645	* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3646	* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3647	* locking, this prevents us from being completely protocol-compliant. The
3648	* real solution to this problem is to start using unsigned file offsets in
3649	* the VFS, but this is a very deep change!
3650	*/
3651	static inline void
3652	nfs4_transform_lock_offset(struct file_lock *lock)
3653	{
3654	if (lock->fl_start < 0)
3655	lock->fl_start = OFFSET_MAX;
3656	if (lock->fl_end < 0)
3657	lock->fl_end = OFFSET_MAX;
3658	}
3659
3660	/* Hack!: For now, we're defining this just so we can use a pointer to it
3661	* as a unique cookie to identify our (NFSv4's) posix locks. */
3662	static const struct lock_manager_operations nfsd_posix_mng_ops = {
3663	};
3664
3665	static inline void
3666	nfs4_set_lock_denied(struct file_lock fl, struct nfsd4_lock_denied deny)
3667	{
3668	struct nfs4_stateowner *sop;
3669
3670	if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3671	sop = (struct nfs4_stateowner *) fl->fl_owner;
3672	kref_get(&sop->so_ref);
3673	deny->ld_sop = sop;
3674	deny->ld_clientid = sop->so_client->cl_clientid;
3675	} else {
3676	deny->ld_sop = NULL;
3677	deny->ld_clientid.cl_boot = 0;
3678	deny->ld_clientid.cl_id = 0;
3679	}
3680	deny->ld_start = fl->fl_start;
3681	deny->ld_length = NFS4_MAX_UINT64;
3682	if (fl->fl_end != NFS4_MAX_UINT64)
3683	deny->ld_length = fl->fl_end - fl->fl_start + 1;
3684	deny->ld_type = NFS4_READ_LT;
3685	if (fl->fl_type != F_RDLCK)
3686	deny->ld_type = NFS4_WRITE_LT;
3687	}
3688
3689	static struct nfs4_stateowner *
3690	find_lockstateowner_str(struct inode inode, clientid_t clid,
3691	struct xdr_netobj *owner)
3692	{
3693	unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3694	struct nfs4_stateowner *op;
3695
3696	list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
3697	if (same_owner_str(op, owner, clid))
3698	return op;
3699	}
3700	return NULL;
3701	}
3702
3703	/*
3704	* Alloc a lock owner structure.
3705	* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3706	* occurred.
3707	*
3708	* strhashval = lock_ownerstr_hashval
3709	*/
3710
3711	static struct nfs4_stateowner *
3712	alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client clp, struct nfs4_stateid open_stp, struct nfsd4_lock *lock) {
3713	struct nfs4_stateowner *sop;
3714	struct nfs4_replay *rp;
3715	unsigned int idhashval;
3716
3717	if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3718	return NULL;
3719	idhashval = lockownerid_hashval(current_ownerid);
3720	INIT_LIST_HEAD(&sop->so_idhash);
3721	INIT_LIST_HEAD(&sop->so_strhash);
3722	INIT_LIST_HEAD(&sop->so_perclient);
3723	INIT_LIST_HEAD(&sop->so_stateids);
3724	INIT_LIST_HEAD(&sop->so_perstateid);
3725	INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3726	sop->so_time = 0;
3727	list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3728	list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
3729	list_add(&sop->so_perstateid, &open_stp->st_lockowners);
3730	sop->so_is_open_owner = 0;
3731	sop->so_id = current_ownerid++;
3732	sop->so_client = clp;
3733	/* It is the openowner seqid that will be incremented in encode in the
3734	* case of new lockowners; so increment the lock seqid manually: */
3735	sop->so_seqid = lock->lk_new_lock_seqid + 1;
3736	sop->so_confirmed = 1;
3737	rp = &sop->so_replay;
3738	rp->rp_status = nfserr_serverfault;
3739	rp->rp_buflen = 0;
3740	rp->rp_buf = rp->rp_ibuf;
3741	return sop;
3742	}
3743
3744	static struct nfs4_stateid *
3745	alloc_init_lock_stateid(struct nfs4_stateowner sop, struct nfs4_file fp, struct nfs4_stateid *open_stp)
3746	{
3747	struct nfs4_stateid *stp;
3748	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3749
3750	stp = nfs4_alloc_stateid();
3751	if (stp == NULL)
3752	goto out;
3753	INIT_LIST_HEAD(&stp->st_hash);
3754	INIT_LIST_HEAD(&stp->st_perfile);
3755	INIT_LIST_HEAD(&stp->st_perstateowner);
3756	INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
3757	list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
3758	list_add(&stp->st_perfile, &fp->fi_stateids);
3759	list_add(&stp->st_perstateowner, &sop->so_stateids);
3760	stp->st_stateowner = sop;
3761	get_nfs4_file(fp);
3762	stp->st_file = fp;
3763	stp->st_stateid.si_boot = boot_time;
3764	stp->st_stateid.si_stateownerid = sop->so_id;
3765	stp->st_stateid.si_fileid = fp->fi_id;
3766	stp->st_stateid.si_generation = 0;
3767	stp->st_access_bmap = 0;
3768	stp->st_deny_bmap = open_stp->st_deny_bmap;
3769	stp->st_openstp = open_stp;
3770
3771	out:
3772	return stp;
3773	}
3774
3775	static int
3776	check_lock_length(u64 offset, u64 length)
3777	{
3778	return ((length == 0) \|\| ((length != NFS4_MAX_UINT64) &&
3779	LOFF_OVERFLOW(offset, length)));
3780	}
3781
3782	static void get_lock_access(struct nfs4_stateid *lock_stp, u32 access)
3783	{
3784	struct nfs4_file *fp = lock_stp->st_file;
3785	int oflag = nfs4_access_to_omode(access);
3786
3787	if (test_bit(access, &lock_stp->st_access_bmap))
3788	return;
3789	nfs4_file_get_access(fp, oflag);
3790	__set_bit(access, &lock_stp->st_access_bmap);
3791	}
3792
3793	/*
3794	* LOCK operation
3795	*/
3796	__be32
3797	nfsd4_lock(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
3798	struct nfsd4_lock *lock)
3799	{
3800	struct nfs4_stateowner *open_sop = NULL;
3801	struct nfs4_stateowner *lock_sop = NULL;
3802	struct nfs4_stateid *lock_stp;
3803	struct nfs4_file *fp;
3804	struct file *filp = NULL;
3805	struct file_lock file_lock;
3806	struct file_lock conflock;
3807	__be32 status = 0;
3808	unsigned int strhashval;
3809	int err;
3810
3811	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3812	(long long) lock->lk_offset,
3813	(long long) lock->lk_length);
3814
3815	if (check_lock_length(lock->lk_offset, lock->lk_length))
3816	return nfserr_inval;
3817
3818	if ((status = fh_verify(rqstp, &cstate->current_fh,
3819	S_IFREG, NFSD_MAY_LOCK))) {
3820	dprintk("NFSD: nfsd4_lock: permission denied!\n");
3821	return status;
3822	}
3823
3824	nfs4_lock_state();
3825
3826	if (lock->lk_is_new) {
3827	/*
3828	* Client indicates that this is a new lockowner.
3829	* Use open owner and open stateid to create lock owner and
3830	* lock stateid.
3831	*/
3832	struct nfs4_stateid *open_stp = NULL;
3833
3834	status = nfserr_stale_clientid;
3835	if (!nfsd4_has_session(cstate) &&
3836	STALE_CLIENTID(&lock->lk_new_clientid))
3837	goto out;
3838
3839	/* validate and update open stateid and open seqid */
3840	status = nfs4_preprocess_seqid_op(cstate,
3841	lock->lk_new_open_seqid,
3842	&lock->lk_new_open_stateid,
3843	OPEN_STATE,
3844	&lock->lk_replay_owner, &open_stp,
3845	lock);
3846	if (status)
3847	goto out;
3848	open_sop = lock->lk_replay_owner;
3849	/* create lockowner and lock stateid */
3850	fp = open_stp->st_file;
3851	strhashval = lock_ownerstr_hashval(fp->fi_inode,
3852	open_sop->so_client->cl_clientid.cl_id,
3853	&lock->v.new.owner);
3854	/* XXX: Do we need to check for duplicate stateowners on
3855	* the same file, or should they just be allowed (and
3856	* create new stateids)? */
3857	status = nfserr_resource;
3858	lock_sop = alloc_init_lock_stateowner(strhashval,
3859	open_sop->so_client, open_stp, lock);
3860	if (lock_sop == NULL)
3861	goto out;
3862	lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
3863	if (lock_stp == NULL)
3864	goto out;
3865	} else {
3866	/* lock (lock owner + lock stateid) already exists */
3867	status = nfs4_preprocess_seqid_op(cstate,
3868	lock->lk_old_lock_seqid,
3869	&lock->lk_old_lock_stateid,
3870	LOCK_STATE,
3871	&lock->lk_replay_owner, &lock_stp, lock);
3872	if (status)
3873	goto out;
3874	lock_sop = lock->lk_replay_owner;
3875	fp = lock_stp->st_file;
3876	}
3877	/* lock->lk_replay_owner and lock_stp have been created or found */
3878
3879	status = nfserr_grace;
3880	if (locks_in_grace() && !lock->lk_reclaim)
3881	goto out;
3882	status = nfserr_no_grace;
3883	if (!locks_in_grace() && lock->lk_reclaim)
3884	goto out;
3885
3886	locks_init_lock(&file_lock);
3887	switch (lock->lk_type) {
3888	case NFS4_READ_LT:
3889	case NFS4_READW_LT:
3890	filp = find_readable_file(lock_stp->st_file);
3891	if (filp)
3892	get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
3893	file_lock.fl_type = F_RDLCK;
3894	break;
3895	case NFS4_WRITE_LT:
3896	case NFS4_WRITEW_LT:
3897	filp = find_writeable_file(lock_stp->st_file);
3898	if (filp)
3899	get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
3900	file_lock.fl_type = F_WRLCK;
3901	break;
3902	default:
3903	status = nfserr_inval;
3904	goto out;
3905	}
3906	if (!filp) {
3907	status = nfserr_openmode;
3908	goto out;
3909	}
3910	file_lock.fl_owner = (fl_owner_t)lock_sop;
3911	file_lock.fl_pid = current->tgid;
3912	file_lock.fl_file = filp;
3913	file_lock.fl_flags = FL_POSIX;
3914	file_lock.fl_lmops = &nfsd_posix_mng_ops;
3915
3916	file_lock.fl_start = lock->lk_offset;
3917	file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
3918	nfs4_transform_lock_offset(&file_lock);
3919
3920	/*
3921	* Try to lock the file in the VFS.
3922	* Note: locks.c uses the BKL to protect the inode's lock list.
3923	*/
3924
3925	err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock);
3926	switch (-err) {
3927	case 0: /* success! */
3928	update_stateid(&lock_stp->st_stateid);
3929	memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3930	sizeof(stateid_t));
3931	status = 0;
3932	break;
3933	case (EAGAIN): /* conflock holds conflicting lock */
3934	status = nfserr_denied;
3935	dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3936	nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3937	break;
3938	case (EDEADLK):
3939	status = nfserr_deadlock;
3940	break;
3941	default:
3942	dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
3943	status = nfserr_resource;
3944	break;
3945	}
3946	out:
3947	if (status && lock->lk_is_new && lock_sop)
3948	release_lockowner(lock_sop);
3949	if (lock->lk_replay_owner) {
3950	nfs4_get_stateowner(lock->lk_replay_owner);
3951	cstate->replay_owner = lock->lk_replay_owner;
3952	}
3953	nfs4_unlock_state();
3954	return status;
3955	}
3956
3957	/*
3958	* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3959	* so we do a temporary open here just to get an open file to pass to
3960	* vfs_test_lock. (Arguably perhaps test_lock should be done with an
3961	* inode operation.)
3962	*/
3963	static int nfsd_test_lock(struct svc_rqst rqstp, struct svc_fh fhp, struct file_lock *lock)
3964	{
3965	struct file *file;
3966	int err;
3967
3968	err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3969	if (err)
3970	return err;
3971	err = vfs_test_lock(file, lock);
3972	nfsd_close(file);
3973	return err;
3974	}
3975
3976	/*
3977	* LOCKT operation
3978	*/
3979	__be32
3980	nfsd4_lockt(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
3981	struct nfsd4_lockt *lockt)
3982	{
3983	struct inode *inode;
3984	struct file_lock file_lock;
3985	int error;
3986	__be32 status;
3987
3988	if (locks_in_grace())
3989	return nfserr_grace;
3990
3991	if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3992	return nfserr_inval;
3993
3994	lockt->lt_stateowner = NULL;
3995	nfs4_lock_state();
3996
3997	status = nfserr_stale_clientid;
3998	if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
3999	goto out;
4000
4001	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
4002	dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
4003	if (status == nfserr_symlink)
4004	status = nfserr_inval;
4005	goto out;
4006	}
4007
4008	inode = cstate->current_fh.fh_dentry->d_inode;
4009	locks_init_lock(&file_lock);
4010	switch (lockt->lt_type) {
4011	case NFS4_READ_LT:
4012	case NFS4_READW_LT:
4013	file_lock.fl_type = F_RDLCK;
4014	break;
4015	case NFS4_WRITE_LT:
4016	case NFS4_WRITEW_LT:
4017	file_lock.fl_type = F_WRLCK;
4018	break;
4019	default:
4020	dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4021	status = nfserr_inval;
4022	goto out;
4023	}
4024
4025	lockt->lt_stateowner = find_lockstateowner_str(inode,
4026	&lockt->lt_clientid, &lockt->lt_owner);
4027	if (lockt->lt_stateowner)
4028	file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
4029	file_lock.fl_pid = current->tgid;
4030	file_lock.fl_flags = FL_POSIX;
4031
4032	file_lock.fl_start = lockt->lt_offset;
4033	file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4034
4035	nfs4_transform_lock_offset(&file_lock);
4036
4037	status = nfs_ok;
4038	error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
4039	if (error) {
4040	status = nfserrno(error);
4041	goto out;
4042	}
4043	if (file_lock.fl_type != F_UNLCK) {
4044	status = nfserr_denied;
4045	nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
4046	}
4047	out:
4048	nfs4_unlock_state();
4049	return status;
4050	}
4051
4052	__be32
4053	nfsd4_locku(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,
4054	struct nfsd4_locku *locku)
4055	{
4056	struct nfs4_stateid *stp;
4057	struct file *filp = NULL;
4058	struct file_lock file_lock;
4059	__be32 status;
4060	int err;
4061
4062	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4063	(long long) locku->lu_offset,
4064	(long long) locku->lu_length);
4065
4066	if (check_lock_length(locku->lu_offset, locku->lu_length))
4067	return nfserr_inval;
4068
4069	nfs4_lock_state();
4070
4071	if ((status = nfs4_preprocess_seqid_op(cstate,
4072	locku->lu_seqid,
4073	&locku->lu_stateid,
4074	LOCK_STATE,
4075	&locku->lu_stateowner, &stp, NULL)))
4076	goto out;
4077
4078	filp = find_any_file(stp->st_file);
4079	if (!filp) {
4080	status = nfserr_lock_range;
4081	goto out;
4082	}
4083	BUG_ON(!filp);
4084	locks_init_lock(&file_lock);
4085	file_lock.fl_type = F_UNLCK;
4086	file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
4087	file_lock.fl_pid = current->tgid;
4088	file_lock.fl_file = filp;
4089	file_lock.fl_flags = FL_POSIX;
4090	file_lock.fl_lmops = &nfsd_posix_mng_ops;
4091	file_lock.fl_start = locku->lu_offset;
4092
4093	file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
4094	nfs4_transform_lock_offset(&file_lock);
4095
4096	/*
4097	* Try to unlock the file in the VFS.
4098	*/
4099	err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
4100	if (err) {
4101	dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4102	goto out_nfserr;
4103	}
4104	/*
4105	* OK, unlock succeeded; the only thing left to do is update the stateid.
4106	*/
4107	update_stateid(&stp->st_stateid);
4108	memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
4109
4110	out:
4111	if (locku->lu_stateowner) {
4112	nfs4_get_stateowner(locku->lu_stateowner);
4113	cstate->replay_owner = locku->lu_stateowner;
4114	}
4115	nfs4_unlock_state();
4116	return status;
4117
4118	out_nfserr:
4119	status = nfserrno(err);
4120	goto out;
4121	}
4122
4123	/*
4124	* returns
4125	* 1: locks held by lockowner
4126	* 0: no locks held by lockowner
4127	*/
4128	static int
4129	check_for_locks(struct nfs4_file filp, struct nfs4_stateowner lowner)
4130	{
4131	struct file_lock **flpp;
4132	struct inode *inode = filp->fi_inode;
4133	int status = 0;
4134
4135	lock_flocks();
4136	for (flpp = &inode->i_flock; flpp != NULL; flpp = &(flpp)->fl_next) {
4137	if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4138	status = 1;
4139	goto out;
4140	}
4141	}
4142	out:
4143	unlock_flocks();
4144	return status;
4145	}
4146
4147	__be32
4148	nfsd4_release_lockowner(struct svc_rqst *rqstp,
4149	struct nfsd4_compound_state *cstate,
4150	struct nfsd4_release_lockowner *rlockowner)
4151	{
4152	clientid_t *clid = &rlockowner->rl_clientid;
4153	struct nfs4_stateowner *sop;
4154	struct nfs4_stateid *stp;
4155	struct xdr_netobj *owner = &rlockowner->rl_owner;
4156	struct list_head matches;
4157	int i;
4158	__be32 status;
4159
4160	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4161	clid->cl_boot, clid->cl_id);
4162
4163	/* XXX check for lease expiration */
4164
4165	status = nfserr_stale_clientid;
4166	if (STALE_CLIENTID(clid))
4167	return status;
4168
4169	nfs4_lock_state();
4170
4171	status = nfserr_locks_held;
4172	/* XXX: we're doing a linear search through all the lockowners.
4173	* Yipes! For now we'll just hope clients aren't really using
4174	* release_lockowner much, but eventually we have to fix these
4175	* data structures. */
4176	INIT_LIST_HEAD(&matches);
4177	for (i = 0; i < LOCK_HASH_SIZE; i++) {
4178	list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
4179	if (!same_owner_str(sop, owner, clid))
4180	continue;
4181	list_for_each_entry(stp, &sop->so_stateids,
4182	st_perstateowner) {
4183	if (check_for_locks(stp->st_file, sop))
4184	goto out;
4185	/* Note: so_perclient unused for lockowners,
4186	* so it's OK to fool with here. */
4187	list_add(&sop->so_perclient, &matches);
4188	}
4189	}
4190	}
4191	/* Clients probably won't expect us to return with some (but not all)
4192	* of the lockowner state released; so don't release any until all
4193	* have been checked. */
4194	status = nfs_ok;
4195	while (!list_empty(&matches)) {
4196	sop = list_entry(matches.next, struct nfs4_stateowner,
4197	so_perclient);
4198	/* unhash_stateowner deletes so_perclient only
4199	* for openowners. */
4200	list_del(&sop->so_perclient);
4201	release_lockowner(sop);
4202	}
4203	out:
4204	nfs4_unlock_state();
4205	return status;
4206	}
4207
4208	static inline struct nfs4_client_reclaim *
4209	alloc_reclaim(void)
4210	{
4211	return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4212	}
4213
4214	int
4215	nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4216	{
4217	unsigned int strhashval = clientstr_hashval(name);
4218	struct nfs4_client *clp;
4219
4220	clp = find_confirmed_client_by_str(name, strhashval);
4221	return clp ? 1 : 0;
4222	}
4223
4224	/*
4225	* failure => all reset bets are off, nfserr_no_grace...
4226	*/
4227	int
4228	nfs4_client_to_reclaim(const char *name)
4229	{
4230	unsigned int strhashval;
4231	struct nfs4_client_reclaim *crp = NULL;
4232
4233	dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4234	crp = alloc_reclaim();
4235	if (!crp)
4236	return 0;
4237	strhashval = clientstr_hashval(name);
4238	INIT_LIST_HEAD(&crp->cr_strhash);
4239	list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4240	memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4241	reclaim_str_hashtbl_size++;
4242	return 1;
4243	}
4244
4245	static void
4246	nfs4_release_reclaim(void)
4247	{
4248	struct nfs4_client_reclaim *crp = NULL;
4249	int i;
4250
4251	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4252	while (!list_empty(&reclaim_str_hashtbl[i])) {
4253	crp = list_entry(reclaim_str_hashtbl[i].next,
4254	struct nfs4_client_reclaim, cr_strhash);
4255	list_del(&crp->cr_strhash);
4256	kfree(crp);
4257	reclaim_str_hashtbl_size--;
4258	}
4259	}
4260	BUG_ON(reclaim_str_hashtbl_size);
4261	}
4262
4263	/*
4264	* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4265	static struct nfs4_client_reclaim *
4266	nfs4_find_reclaim_client(clientid_t *clid)
4267	{
4268	unsigned int strhashval;
4269	struct nfs4_client *clp;
4270	struct nfs4_client_reclaim *crp = NULL;
4271
4272
4273	/* find clientid in conf_id_hashtbl */
4274	clp = find_confirmed_client(clid);
4275	if (clp == NULL)
4276	return NULL;
4277
4278	dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4279	clp->cl_name.len, clp->cl_name.data,
4280	clp->cl_recdir);
4281
4282	/* find clp->cl_name in reclaim_str_hashtbl */
4283	strhashval = clientstr_hashval(clp->cl_recdir);
4284	list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4285	if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4286	return crp;
4287	}
4288	}
4289	return NULL;
4290	}
4291
4292	/*
4293	* Called from OPEN. Look for clientid in reclaim list.
4294	*/
4295	__be32
4296	nfs4_check_open_reclaim(clientid_t *clid)
4297	{
4298	return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
4299	}
4300
4301	/* initialization to perform at module load time: */
4302
4303	int
4304	nfs4_state_init(void)
4305	{
4306	int i, status;
4307
4308	status = nfsd4_init_slabs();
4309	if (status)
4310	return status;
4311	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4312	INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4313	INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4314	INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4315	INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4316	INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4317	}
4318	for (i = 0; i < SESSION_HASH_SIZE; i++)
4319	INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4320	for (i = 0; i < FILE_HASH_SIZE; i++) {
4321	INIT_LIST_HEAD(&file_hashtbl[i]);
4322	}
4323	for (i = 0; i < OWNER_HASH_SIZE; i++) {
4324	INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4325	INIT_LIST_HEAD(&ownerid_hashtbl[i]);
4326	}
4327	for (i = 0; i < STATEID_HASH_SIZE; i++) {
4328	INIT_LIST_HEAD(&stateid_hashtbl[i]);
4329	INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
4330	}
4331	for (i = 0; i < LOCK_HASH_SIZE; i++) {
4332	INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
4333	INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4334	}
4335	memset(&onestateid, ~0, sizeof(stateid_t));
4336	INIT_LIST_HEAD(&close_lru);
4337	INIT_LIST_HEAD(&client_lru);
4338	INIT_LIST_HEAD(&del_recall_lru);
4339	reclaim_str_hashtbl_size = 0;
4340	return 0;
4341	}
4342
4343	static void
4344	nfsd4_load_reboot_recovery_data(void)
4345	{
4346	int status;
4347
4348	nfs4_lock_state();
4349	nfsd4_init_recdir(user_recovery_dirname);
4350	status = nfsd4_recdir_load();
4351	nfs4_unlock_state();
4352	if (status)
4353	printk("NFSD: Failure reading reboot recovery data\n");
4354	}
4355
4356	/*
4357	* Since the lifetime of a delegation isn't limited to that of an open, a
4358	* client may quite reasonably hang on to a delegation as long as it has
4359	* the inode cached. This becomes an obvious problem the first time a
4360	* client's inode cache approaches the size of the server's total memory.
4361	*
4362	* For now we avoid this problem by imposing a hard limit on the number
4363	* of delegations, which varies according to the server's memory size.
4364	*/
4365	static void
4366	set_max_delegations(void)
4367	{
4368	/*
4369	* Allow at most 4 delegations per megabyte of RAM. Quick
4370	* estimates suggest that in the worst case (where every delegation
4371	* is for a different inode), a delegation could take about 1.5K,
4372	* giving a worst case usage of about 6% of memory.
4373	*/
4374	max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4375	}
4376
4377	/* initialization to perform when the nfsd service is started: */
4378
4379	static int
4380	__nfs4_state_start(void)
4381	{
4382	int ret;
4383
4384	boot_time = get_seconds();
4385	locks_start_grace(&nfsd4_manager);
4386	printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4387	nfsd4_grace);
4388	ret = set_callback_cred();
4389	if (ret)
4390	return -ENOMEM;
4391	laundry_wq = create_singlethread_workqueue("nfsd4");
4392	if (laundry_wq == NULL)
4393	return -ENOMEM;
4394	ret = nfsd4_create_callback_queue();
4395	if (ret)
4396	goto out_free_laundry;
4397	queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4398	set_max_delegations();
4399	return 0;
4400	out_free_laundry:
4401	destroy_workqueue(laundry_wq);
4402	return ret;
4403	}
4404
4405	int
4406	nfs4_state_start(void)
4407	{
4408	nfsd4_load_reboot_recovery_data();
4409	return __nfs4_state_start();
4410	}
4411
4412	static void
4413	__nfs4_state_shutdown(void)
4414	{
4415	int i;
4416	struct nfs4_client *clp = NULL;
4417	struct nfs4_delegation *dp = NULL;
4418	struct list_head pos, next, reaplist;
4419
4420	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4421	while (!list_empty(&conf_id_hashtbl[i])) {
4422	clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4423	expire_client(clp);
4424	}
4425	while (!list_empty(&unconf_str_hashtbl[i])) {
4426	clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4427	expire_client(clp);
4428	}
4429	}
4430	INIT_LIST_HEAD(&reaplist);
4431	spin_lock(&recall_lock);
4432	list_for_each_safe(pos, next, &del_recall_lru) {
4433	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4434	list_move(&dp->dl_recall_lru, &reaplist);
4435	}
4436	spin_unlock(&recall_lock);
4437	list_for_each_safe(pos, next, &reaplist) {
4438	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4439	list_del_init(&dp->dl_recall_lru);
4440	unhash_delegation(dp);
4441	}
4442
4443	nfsd4_shutdown_recdir();
4444	}
4445
4446	void
4447	nfs4_state_shutdown(void)
4448	{
4449	cancel_delayed_work_sync(&laundromat_work);
4450	destroy_workqueue(laundry_wq);
4451	locks_end_grace(&nfsd4_manager);
4452	nfs4_lock_state();
4453	nfs4_release_reclaim();
4454	__nfs4_state_shutdown();
4455	nfs4_unlock_state();
4456	nfsd4_destroy_callback_queue();
4457	}
4458
4459	/*
4460	* user_recovery_dirname is protected by the nfsd_mutex since it's only
4461	* accessed when nfsd is starting.
4462	*/
4463	static void
4464	nfs4_set_recdir(char *recdir)
4465	{
4466	strcpy(user_recovery_dirname, recdir);
4467	}
4468
4469	/*
4470	* Change the NFSv4 recovery directory to recdir.
4471	*/
4472	int
4473	nfs4_reset_recoverydir(char *recdir)
4474	{
4475	int status;
4476	struct path path;
4477
4478	status = kern_path(recdir, LOOKUP_FOLLOW, &path);
4479	if (status)
4480	return status;
4481	status = -ENOTDIR;
4482	if (S_ISDIR(path.dentry->d_inode->i_mode)) {
4483	nfs4_set_recdir(recdir);
4484	status = 0;
4485	}
4486	path_put(&path);
4487	return status;
4488	}
4489
4490	char *
4491	nfs4_recoverydir(void)
4492	{
4493	return user_recovery_dirname;
4494	}
4495

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