nfs4state.c 67.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
/*
*  linux/fs/nfsd/nfs4state.c
*
*  Copyright (c) 2001 The Regents of the University of Michigan.
*  All rights reserved.
*
*  Kendrick Smith <kmsmith@umich.edu>
*  Andy Adamson <kandros@umich.edu>
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
*  1. Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*  2. Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*  3. Neither the name of the University nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
*  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
*  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
*  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
*  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
*  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
*  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#include <linux/param.h>
#include <linux/major.h>
#include <linux/slab.h>

#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
44
#include <linux/mount.h>
45
#include <linux/workqueue.h>
46
#include <linux/smp_lock.h>
47 48
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
49
#include <linux/nfsd/xdr4.h>
50 51 52 53 54

#define NFSDDBG_FACILITY                NFSDDBG_PROC

/* Globals */
time_t boot_time;
55
static time_t grace_end = 0;
56
static u32 current_clientid = 1;
57 58 59
static u32 current_ownerid;
static u32 current_fileid;
static u32 nfs4_init;
60 61
stateid_t zerostateid;             /* bits all 0 */
stateid_t onestateid;              /* bits all 1 */
62 63 64 65 66 67

/* debug counters */
u32 list_add_perfile = 0; 
u32 list_del_perfile = 0;
u32 add_perclient = 0;
u32 del_perclient = 0;
68 69 70 71 72 73
u32 alloc_file = 0;
u32 free_file = 0;
u32 alloc_sowner = 0;
u32 free_sowner = 0;
u32 vfsopen = 0;
u32 vfsclose = 0;
74 75 76 77
u32 alloc_lsowner= 0;

/* forward declarations */
struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
78 79 80 81 82 83 84 85 86

/* Locking:
 *
 * client_sema: 
 * 	protects clientid_hashtbl[], clientstr_hashtbl[],
 * 	unconfstr_hashtbl[], uncofid_hashtbl[].
 */
static struct semaphore client_sema;

87
void
88
nfs4_lock_state(void)
89 90 91 92
{
	down(&client_sema);
}

93 94 95
/*
 * nfs4_unlock_state(); called in encode
 */
96
void
97
nfs4_unlock_state(void)
98 99 100 101
{
	up(&client_sema);
}

102 103 104 105 106 107 108 109 110 111 112 113 114
static inline u32
opaque_hashval(const void *ptr, int nbytes)
{
	unsigned char *cptr = (unsigned char *) ptr;

	u32 x = 0;
	while (nbytes--) {
		x *= 37;
		x += *cptr++;
	}
	return x;
}

115 116
/* forward declarations */
static void release_stateowner(struct nfs4_stateowner *sop);
117
static void release_stateid(struct nfs4_stateid *stp, int flags);
118 119
static void release_file(struct nfs4_file *fp);

120 121 122 123 124

/* 
 * SETCLIENTID state 
 */

125 126 127 128 129 130 131 132 133 134 135 136 137 138 139
/* Hash tables for nfs4_clientid state */
#define CLIENT_HASH_BITS                 4
#define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
#define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)

#define clientid_hashval(id) \
	((id) & CLIENT_HASH_MASK)
#define clientstr_hashval(name, namelen) \
	(opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)

/* conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 * setclientid_confirmed info. 
 *
 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
 * setclientid info.
140 141 142
 *
 * client_lru holds client queue ordered by nfs4_client.cl_time
 * for lease renewal.
143 144 145
 *
 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 * for last close replay.
146 147 148 149 150
 */
static struct list_head	conf_id_hashtbl[CLIENT_HASH_SIZE];
static struct list_head	conf_str_hashtbl[CLIENT_HASH_SIZE];
static struct list_head	unconf_str_hashtbl[CLIENT_HASH_SIZE];
static struct list_head	unconf_id_hashtbl[CLIENT_HASH_SIZE];
151
static struct list_head client_lru;
152
static struct list_head close_lru;
153 154 155 156 157 158 159 160 161 162 163 164 165

static inline void
renew_client(struct nfs4_client *clp)
{
	/*
	* Move client to the end to the LRU list.
	*/
	dprintk("renewing client (clientid %08x/%08x)\n", 
			clp->cl_clientid.cl_boot, 
			clp->cl_clientid.cl_id);
	list_move_tail(&clp->cl_lru, &client_lru);
	clp->cl_time = get_seconds();
}
166 167 168 169 170 171 172

/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid)
{
	if (clid->cl_boot == boot_time)
		return 0;
173 174
	dprintk("NFSD stale clientid (%08x/%08x)\n", 
			clid->cl_boot, clid->cl_id);
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204
	return 1;
}

/* 
 * XXX Should we use a slab cache ?
 * This type of memory management is somewhat inefficient, but we use it
 * anyway since SETCLIENTID is not a common operation.
 */
static inline struct nfs4_client *
alloc_client(struct xdr_netobj name)
{
	struct nfs4_client *clp;

	if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
		memset(clp, 0, sizeof(*clp));
		if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
			memcpy(clp->cl_name.data, name.data, name.len);
			clp->cl_name.len = name.len;
		}
		else {
			kfree(clp);
			clp = NULL;
		}
	}
	return clp;
}

static inline void
free_client(struct nfs4_client *clp)
{
Andrew Morton's avatar
Andrew Morton committed
205 206
	if (clp->cl_cred.cr_group_info)
		put_group_info(clp->cl_cred.cr_group_info);
207 208 209 210 211 212 213
	kfree(clp->cl_name.data);
	kfree(clp);
}

static void
expire_client(struct nfs4_client *clp)
{
214 215
	struct nfs4_stateowner *sop;

216 217 218
	dprintk("NFSD: expire_client\n");
	list_del(&clp->cl_idhash);
	list_del(&clp->cl_strhash);
219
	list_del(&clp->cl_lru);
220 221 222 223
	while (!list_empty(&clp->cl_perclient)) {
		sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
		release_stateowner(sop);
	}
224 225 226 227 228 229 230 231 232 233 234
	free_client(clp);
}

static struct nfs4_client *
create_client(struct xdr_netobj name) {
	struct nfs4_client *clp;

	if(!(clp = alloc_client(name)))
		goto out;
	INIT_LIST_HEAD(&clp->cl_idhash);
	INIT_LIST_HEAD(&clp->cl_strhash);
235
	INIT_LIST_HEAD(&clp->cl_perclient);
236
	INIT_LIST_HEAD(&clp->cl_lru);
237 238 239 240 241
out:
	return clp;
}

static void
242 243
copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
	memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
244 245 246 247 248 249 250 251 252 253 254 255 256
}

static void
copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
	target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
}

static void
copy_cred(struct svc_cred *target, struct svc_cred *source) {

	target->cr_uid = source->cr_uid;
	target->cr_gid = source->cr_gid;
Andrew Morton's avatar
Andrew Morton committed
257 258
	target->cr_group_info = source->cr_group_info;
	get_group_info(target->cr_group_info);
259 260 261 262 263 264 265 266 267 268
}

static int
cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
	if(!n1 || !n2)
		return 0;
	return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
}

static int
269 270
cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
	return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
271 272 273 274 275 276 277 278 279 280 281
}

static int
cmp_clid(clientid_t * cl1, clientid_t * cl2) {
	return((cl1->cl_boot == cl2->cl_boot) &&
	   	(cl1->cl_id == cl2->cl_id));
}

/* XXX what about NGROUP */
static int
cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
282
	return(cr1->cr_uid == cr2->cr_uid);
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297

}

static void
gen_clid(struct nfs4_client *clp) {
	clp->cl_clientid.cl_boot = boot_time;
	clp->cl_clientid.cl_id = current_clientid++; 
}

static void
gen_confirm(struct nfs4_client *clp) {
	struct timespec 	tv;
	u32 *			p;

	tv = CURRENT_TIME;
298
	p = (u32 *)clp->cl_confirm.data;
299 300 301 302 303 304 305 306 307
	*p++ = tv.tv_sec;
	*p++ = tv.tv_nsec;
}

static int
check_name(struct xdr_netobj name) {

	if (name.len == 0) 
		return 0;
308
	if (name.len > NFS4_OPAQUE_LIMIT) {
309 310 311 312 313 314 315 316 317 318 319 320 321 322
		printk("NFSD: check_name: name too long(%d)!\n", name.len);
		return 0;
	}
	return 1;
}

void
add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
{
	unsigned int idhashval;

	list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
	idhashval = clientid_hashval(clp->cl_clientid.cl_id);
	list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
323 324
	list_add_tail(&clp->cl_lru, &client_lru);
	clp->cl_time = get_seconds();
325 326 327 328 329 330 331
}

void
move_to_confirmed(struct nfs4_client *clp, unsigned int idhashval)
{
	unsigned int strhashval;

332
	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
333 334 335 336 337 338
	list_del_init(&clp->cl_strhash);
	list_del_init(&clp->cl_idhash);
	list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
	strhashval = clientstr_hashval(clp->cl_name.data, 
			clp->cl_name.len);
	list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
339
	renew_client(clp);
340 341
}

342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430

/* a helper function for parse_callback */
static int
parse_octet(unsigned int *lenp, char **addrp)
{
	unsigned int len = *lenp;
	char *p = *addrp;
	int n = -1;
	char c;

	for (;;) {
		if (!len)
			break;
		len--;
		c = *p++;
		if (c == '.')
			break;
		if ((c < '0') || (c > '9')) {
			n = -1;
			break;
		}
		if (n < 0)
			n = 0;
		n = (n * 10) + (c - '0');
		if (n > 255) {
			n = -1;
			break;
		}
	}
	*lenp = len;
	*addrp = p;
	return n;
}

/* parse and set the setclientid ipv4 callback address */
int
parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
{
	int temp = 0;
	u32 cbaddr = 0;
	u16 cbport = 0;
	u32 addrlen = addr_len;
	char *addr = addr_val;
	int i, shift;

	/* ipaddress */
	shift = 24;
	for(i = 4; i > 0  ; i--) {
		if ((temp = parse_octet(&addrlen, &addr)) < 0) {
			return 0;
		}
		cbaddr |= (temp << shift);
		if(shift > 0)
		shift -= 8;
	}
	*cbaddrp = cbaddr;

	/* port */
	shift = 8;
	for(i = 2; i > 0  ; i--) {
		if ((temp = parse_octet(&addrlen, &addr)) < 0) {
			return 0;
		}
		cbport |= (temp << shift);
		if(shift > 0)
			shift -= 8;
	}
	*cbportp = cbport;
	return 1;
}

void
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
{
	struct nfs4_callback *cb = &clp->cl_callback;

	if( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
		         &cb->cb_addr, &cb->cb_port))) {
		printk(KERN_INFO "NFSD: BAD callback address. client will not receive delegations\n");
		cb->cb_parsed = 0;
		return;
	}
	cb->cb_netid.len = se->se_callback_netid_len;
	cb->cb_netid.data = se->se_callback_netid_val;
        cb->cb_prog = se->se_callback_prog;
        cb->cb_ident = se->se_callback_ident;
        cb->cb_parsed = 1;
}

431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471
/*
 * RFC 3010 has a complex implmentation description of processing a 
 * SETCLIENTID request consisting of 5 bullets, labeled as 
 * CASE0 - CASE4 below.
 *
 * NOTES:
 * 	callback information will be processed in a future patch
 *
 *	an unconfirmed record is added when:
 *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 *	CASE 1: confirmed record found with matching name, principal,
 *		verifier, and clientid.
 *	CASE 2: confirmed record found with matching name, principal,
 *		and there is no unconfirmed record with matching
 *		name and principal
 *
 *      an unconfirmed record is replaced when:
 *	CASE 3: confirmed record found with matching name, principal,
 *		and an unconfirmed record is found with matching 
 *		name, principal, and with clientid and
 *		confirm that does not match the confirmed record.
 *	CASE 4: there is no confirmed record with matching name and 
 *		principal. there is an unconfirmed record with 
 *		matching name, principal.
 *
 *	an unconfirmed record is deleted when:
 *	CASE 1: an unconfirmed record that matches input name, verifier,
 *		and confirmed clientid.
 *	CASE 4: any unconfirmed records with matching name and principal
 *		that exist after an unconfirmed record has been replaced
 *		as described above.
 *
 */
int
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
{
	u32 			ip_addr = rqstp->rq_addr.sin_addr.s_addr;
	struct xdr_netobj 	clname = { 
		.len = setclid->se_namelen,
		.data = setclid->se_name,
	};
472
	nfs4_verifier		clverifier = setclid->se_verf;
473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488
	unsigned int 		strhashval;
	struct nfs4_client *	conf, * unconf, * new, * clp;
	int 			status;
	
	status = nfserr_inval;
	if (!check_name(clname))
		goto out;

	/* 
	 * XXX The Duplicate Request Cache (DRC) has been checked (??)
	 * We get here on a DRC miss.
	 */

	strhashval = clientstr_hashval(clname.data, clname.len);

	conf = NULL;
489
	nfs4_lock_state();
490
	list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
		if (!cmp_name(&clp->cl_name, &clname))
			continue;
		/* 
		 * CASE 0:
		 * clname match, confirmed, different principal
		 * or different ip_address
		 */
		status = nfserr_clid_inuse;
		if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
			printk("NFSD: setclientid: string in use by client"
			"(clientid %08x/%08x)\n",
			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
			goto out;
		}
		if (clp->cl_addr != ip_addr) { 
			printk("NFSD: setclientid: string in use by client"
			"(clientid %08x/%08x)\n",
			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
			goto out;
		}

		/* 
	 	 * cl_name match from a previous SETCLIENTID operation
	 	 * XXX check for additional matches?
		 */
		conf = clp;
		break;
	}
	unconf = NULL;
520
	list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
		if (!cmp_name(&clp->cl_name, &clname))
			continue;
		/* cl_name match from a previous SETCLIENTID operation */
		unconf = clp;
		break;
	}
	status = nfserr_resource;
	if (!conf) {
		/* 
		 * CASE 4:
		 * placed first, because it is the normal case.
		 */
		if (unconf)
			expire_client(unconf);
		if (!(new = create_client(clname)))
			goto out;
537
		copy_verf(new, &clverifier);
538 539 540 541
		new->cl_addr = ip_addr;
		copy_cred(&new->cl_cred,&rqstp->rq_cred);
		gen_clid(new);
		gen_confirm(new);
542
		gen_callback(new, setclid);
543
		add_to_unconfirmed(new, strhashval);
544
	} else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
545 546 547 548 549 550 551 552 553 554 555 556 557 558
		/*
		 * CASE 1:
		 * cl_name match, confirmed, principal match
		 * verifier match: probable callback update
		 *
		 * remove any unconfirmed nfs4_client with 
		 * matching cl_name, cl_verifier, and cl_clientid
		 *
		 * create and insert an unconfirmed nfs4_client with same 
		 * cl_name, cl_verifier, and cl_clientid as existing 
		 * nfs4_client,  but with the new callback info and a 
		 * new cl_confirm
		 */
		if ((unconf) && 
559
		    cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
560 561 562 563 564
		     cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
				expire_client(unconf);
		}
		if (!(new = create_client(clname)))
			goto out;
565
		copy_verf(new,&conf->cl_verifier);
566 567 568 569
		new->cl_addr = ip_addr;
		copy_cred(&new->cl_cred,&rqstp->rq_cred);
		copy_clid(new, conf);
		gen_confirm(new);
570
		gen_callback(new, setclid);
571 572 573 574 575 576 577 578 579 580 581 582
		add_to_unconfirmed(new,strhashval);
	} else if (!unconf) {
		/*
		 * CASE 2:
		 * clname match, confirmed, principal match
		 * verfier does not match
		 * no unconfirmed. create a new unconfirmed nfs4_client
		 * using input clverifier, clname, and callback info
		 * and generate a new cl_clientid and cl_confirm.
		 */
		if (!(new = create_client(clname)))
			goto out;
583
		copy_verf(new,&clverifier);
584 585 586 587
		new->cl_addr = ip_addr;
		copy_cred(&new->cl_cred,&rqstp->rq_cred);
		gen_clid(new);
		gen_confirm(new);
588
		gen_callback(new, setclid);
589
		add_to_unconfirmed(new, strhashval);
590
	} else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608
		/*	
		 * CASE3:
		 * confirmed found (name, principal match)
		 * confirmed verifier does not match input clverifier
		 *
		 * unconfirmed found (name match)
		 * confirmed->cl_confirm != unconfirmed->cl_confirm
		 *
		 * remove unconfirmed.
		 *
		 * create an unconfirmed nfs4_client 
		 * with same cl_name as existing confirmed nfs4_client, 
		 * but with new callback info, new cl_clientid,
		 * new cl_verifier and a new cl_confirm
		 */
		expire_client(unconf);
		if (!(new = create_client(clname)))
			goto out;
609
		copy_verf(new,&clverifier);
610 611 612 613
		new->cl_addr = ip_addr;
		copy_cred(&new->cl_cred,&rqstp->rq_cred);
		gen_clid(new);
		gen_confirm(new);
614
		gen_callback(new, setclid);
615 616 617 618 619 620 621 622 623
		add_to_unconfirmed(new, strhashval);
	} else {
		/* No cases hit !!! */
		status = nfserr_inval;
		goto out;

	}
	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
624
	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
625 626
	status = nfs_ok;
out:
627
	nfs4_unlock_state();
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644
	return status;
}


/*
 * RFC 3010 has a complex implmentation description of processing a 
 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 *
 * NOTE: callback information will be processed here in a future patch
 */
int
nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
{
	u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
	unsigned int idhashval;
	struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
645
	nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
646 647 648 649 650 651 652 653 654 655 656 657
	clientid_t * clid = &setclientid_confirm->sc_clientid;
	int status;

	status = nfserr_stale_clientid;
	if (STALE_CLIENTID(clid))
		goto out;
	/* 
	 * XXX The Duplicate Request Cache (DRC) has been checked (??)
	 * We get here on a DRC miss.
	 */

	idhashval = clientid_hashval(clid->cl_id);
658
	nfs4_lock_state();
659
	list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
		if (!cmp_clid(&clp->cl_clientid, clid))
			continue;

		status = nfserr_inval;
		/* 
		 * Found a record for this clientid. If the IP addresses
		 * don't match, return ERR_INVAL just as if the record had
		 * not been found.
		 */
		if (clp->cl_addr != ip_addr) { 
			printk("NFSD: setclientid: string in use by client"
			"(clientid %08x/%08x)\n",
			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
			goto out;
		}
		conf = clp;
		break;
	}
678
	list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
		if (!cmp_clid(&clp->cl_clientid, clid))
			continue;
		status = nfserr_inval;
		if (clp->cl_addr != ip_addr) { 
			printk("NFSD: setclientid: string in use by client"
			"(clientid %08x/%08x)\n",
			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
			goto out;
		}
		unconf = clp;
		break;
	}
	/* CASE 1: 
	* unconf record that matches input clientid and input confirm.
	* conf record that matches input clientid.
	* conf  and unconf records match names, verifiers 
	*/
	if ((conf && unconf) && 
697 698
	    (cmp_verf(&unconf->cl_confirm, &confirm)) &&
	    (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
699
	    (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
700
	    (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
		if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 
			status = nfserr_clid_inuse;
		else {
			expire_client(conf);
			move_to_confirmed(unconf, idhashval);
			status = nfs_ok;
		}
		goto out;
	} 
	/* CASE 2:
	 * conf record that matches input clientid.
	 * if unconf record that matches input clientid, then unconf->cl_name
	 * or unconf->cl_verifier don't match the conf record.
	 */
	if ((conf && !unconf) || 
	    ((conf && unconf) && 
717
	     (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
718 719 720 721 722 723 724 725 726 727 728 729 730
	      !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
		if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
			status = nfserr_clid_inuse;
		} else {
			status = nfs_ok;
		}
		goto out;
	}
	/* CASE 3:
	 * conf record not found.
	 * unconf record found. 
	 * unconf->cl_confirm matches input confirm
	 */ 
731
	if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
732 733 734 735 736 737 738 739 740 741 742 743 744 745
		if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
			status = nfserr_clid_inuse;
		} else {
			status = nfs_ok;
			move_to_confirmed(unconf, idhashval);
		}
		goto out;
	}
	/* CASE 4:
	 * conf record not found, or if conf, then conf->cl_confirm does not
	 * match input confirm.
	 * unconf record not found, or if unconf, then unconf->cl_confirm 
	 * does not match input confirm.
	 */
746 747
	if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
	    (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
748 749 750 751 752 753 754 755
		status = nfserr_stale_clientid;
		goto out;
	}
	/* check that we have hit one of the cases...*/
	status = nfserr_inval;
	goto out;
out:
	/* XXX if status == nfs_ok, probe callback path */
756
	nfs4_unlock_state();
757 758 759
	return status;
}

760 761 762 763 764 765 766 767 768
/* 
 * Open owner state (share locks)
 */

/* hash tables for nfs4_stateowner */
#define OWNER_HASH_BITS              8
#define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
#define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)

769 770
#define ownerid_hashval(id) \
        ((id) & OWNER_HASH_MASK)
771 772 773
#define ownerstr_hashval(clientid, ownername) \
        (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)

774
static struct list_head	ownerid_hashtbl[OWNER_HASH_SIZE];
775 776 777 778 779 780
static struct list_head	ownerstr_hashtbl[OWNER_HASH_SIZE];

/* hash table for nfs4_file */
#define FILE_HASH_BITS                   8
#define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
#define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
781
/* hash table for (open)nfs4_stateid */
782 783 784
#define STATEID_HASH_BITS              10
#define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
#define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
785 786

#define file_hashval(x) \
787
        hash_ptr(x, FILE_HASH_BITS)
788 789
#define stateid_hashval(owner_id, file_id)  \
        (((owner_id) + (file_id)) & STATEID_HASH_MASK)
790 791

static struct list_head file_hashtbl[FILE_HASH_SIZE];
792
static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
793 794 795

/* OPEN Share state helper functions */
static inline struct nfs4_file *
796
alloc_init_file(unsigned int hashval, struct inode *ino) {
797 798 799 800 801
	struct nfs4_file *fp;
	if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
		INIT_LIST_HEAD(&fp->fi_hash);
		INIT_LIST_HEAD(&fp->fi_perfile);
		list_add(&fp->fi_hash, &file_hashtbl[hashval]);
802
		fp->fi_inode = igrab(ino);
803
		fp->fi_id = current_fileid++;
804
		alloc_file++;
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
		return fp;
	}
	return (struct nfs4_file *)NULL;
}

static void
release_all_files(void)
{
	int i;
	struct nfs4_file *fp;

	for (i=0;i<FILE_HASH_SIZE;i++) {
		while (!list_empty(&file_hashtbl[i])) {
			fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
			/* this should never be more than once... */
			if(!list_empty(&fp->fi_perfile)) {
				printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
			}
823
			release_file(fp);
824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
		}
	}
}

static inline struct nfs4_stateowner *
alloc_stateowner(struct xdr_netobj *owner)
{
	struct nfs4_stateowner *sop;

	if ((sop = kmalloc(sizeof(struct nfs4_stateowner),GFP_KERNEL))) {
		if((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
			memcpy(sop->so_owner.data, owner->data, owner->len);
			sop->so_owner.len = owner->len;
			return sop;
		} 
		kfree(sop);
	}
	return (struct nfs4_stateowner *)NULL;
}

/* should use a slab cache */
static void
free_stateowner(struct nfs4_stateowner *sop) {
	if(sop) {
		kfree(sop->so_owner.data);
		kfree(sop);
		sop = NULL;
851
		free_sowner++;
852 853 854 855
	}
}

static struct nfs4_stateowner *
856
alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
857
	struct nfs4_stateowner *sop;
858
	struct nfs4_replay *rp;
859
	unsigned int idhashval;
860 861 862

	if (!(sop = alloc_stateowner(&open->op_owner)))
		return (struct nfs4_stateowner *)NULL;
863 864
	idhashval = ownerid_hashval(current_ownerid);
	INIT_LIST_HEAD(&sop->so_idhash);
865 866
	INIT_LIST_HEAD(&sop->so_strhash);
	INIT_LIST_HEAD(&sop->so_perclient);
867
	INIT_LIST_HEAD(&sop->so_perfilestate);
868
	INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
869 870
	INIT_LIST_HEAD(&sop->so_close_lru);
	sop->so_time = 0;
871
	list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
872 873 874
	list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
	list_add(&sop->so_perclient, &clp->cl_perclient);
	add_perclient++;
875
	sop->so_is_open_owner = 1;
876 877 878
	sop->so_id = current_ownerid++;
	sop->so_client = clp;
	sop->so_seqid = open->op_seqid;
879
	sop->so_confirmed = 0;
880 881 882 883
	rp = &sop->so_replay;
	rp->rp_status = NFSERR_SERVERFAULT;
	rp->rp_buflen = 0;
	rp->rp_buf = rp->rp_ibuf;
884
	alloc_sowner++;
885 886 887
	return sop;
}

888 889 890 891 892 893 894 895 896 897 898 899 900 901
static void
release_stateid_lockowner(struct nfs4_stateid *open_stp)
{
	struct nfs4_stateowner *lock_sop;

	while (!list_empty(&open_stp->st_perlockowner)) {
		lock_sop = list_entry(open_stp->st_perlockowner.next,
				struct nfs4_stateowner, so_perlockowner);
		/* list_del(&open_stp->st_perlockowner);  */
		BUG_ON(lock_sop->so_is_open_owner);
		release_stateowner(lock_sop);
	}
}

902 903 904 905 906
static void
release_stateowner(struct nfs4_stateowner *sop)
{
	struct nfs4_stateid *stp;

907 908 909 910
	list_del(&sop->so_idhash);
	list_del(&sop->so_strhash);
	list_del(&sop->so_perclient);
	list_del(&sop->so_perlockowner);
911
	list_del(&sop->so_close_lru);
912
	del_perclient++;
913 914 915
	while (!list_empty(&sop->so_perfilestate)) {
		stp = list_entry(sop->so_perfilestate.next, 
			struct nfs4_stateid, st_perfilestate);
916 917 918 919
		if(sop->so_is_open_owner)
			release_stateid(stp, OPEN_STATE);
		else
			release_stateid(stp, LOCK_STATE);
920 921 922 923 924 925
	}
	free_stateowner(sop);
}

static inline void
init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfs4_stateowner *sop, struct nfsd4_open *open) {
926
	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
927

928
	INIT_LIST_HEAD(&stp->st_hash);
929
	INIT_LIST_HEAD(&stp->st_perfilestate);
930
	INIT_LIST_HEAD(&stp->st_perlockowner);
931
	INIT_LIST_HEAD(&stp->st_perfile);
932 933
	list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
	list_add(&stp->st_perfilestate, &sop->so_perfilestate);
934 935 936 937 938 939 940 941
	list_add_perfile++;
	list_add(&stp->st_perfile, &fp->fi_perfile);
	stp->st_stateowner = sop;
	stp->st_file = fp;
	stp->st_stateid.si_boot = boot_time;
	stp->st_stateid.si_stateownerid = sop->so_id;
	stp->st_stateid.si_fileid = fp->fi_id;
	stp->st_stateid.si_generation = 0;
942 943 944 945
	stp->st_access_bmap = 0;
	stp->st_deny_bmap = 0;
	__set_bit(open->op_share_access, &stp->st_access_bmap);
	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
946 947 948
}

static void
949
release_stateid(struct nfs4_stateid *stp, int flags) {
950

951
	list_del(&stp->st_hash);
952
	list_del_perfile++;
953 954
	list_del(&stp->st_perfile);
	list_del(&stp->st_perfilestate);
955
	if((stp->st_vfs_set) && (flags & OPEN_STATE)) {
956
		release_stateid_lockowner(stp);
957
		nfsd_close(&stp->st_vfs_file);
958
		vfsclose++;
959 960
		dput(stp->st_vfs_file.f_dentry);
		mntput(stp->st_vfs_file.f_vfsmnt);
961 962 963 964
	} else if ((stp->st_vfs_set) && (flags & LOCK_STATE)) {
		struct file *filp = &stp->st_vfs_file;

		locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
965 966 967 968 969
	}
	kfree(stp);
	stp = NULL;
}

970 971 972 973
static void
release_file(struct nfs4_file *fp)
{
	free_file++;
974
	list_del(&fp->fi_hash);
975
	iput(fp->fi_inode);
976 977 978
	kfree(fp);
}	

979 980 981 982 983 984 985 986 987 988 989 990 991
void
move_to_close_lru(struct nfs4_stateowner *sop)
{
	dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
	/* remove stateowner from all other hash lists except perclient */
	list_del_init(&sop->so_idhash);
	list_del_init(&sop->so_strhash);
	list_del_init(&sop->so_perlockowner);

        list_add_tail(&sop->so_close_lru, &close_lru);
        sop->so_time = get_seconds();
}

992
void
993 994
release_state_owner(struct nfs4_stateid *stp, struct nfs4_stateowner **sopp,
		int flag)
995 996 997 998
{
	struct nfs4_stateowner *sop = stp->st_stateowner;
	struct nfs4_file *fp = stp->st_file;

999 1000
	dprintk("NFSD: release_state_owner\n");
	release_stateid(stp, flag);
1001 1002

	/* place unused nfs4_stateowners on so_close_lru list to be
1003 1004 1005
	 * released by the laundromat service after the lease period
	 * to enable us to handle CLOSE replay
	 */
1006 1007
	if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
		move_to_close_lru(sop);
1008 1009 1010 1011 1012 1013
	/* unused nfs4_file's are releseed. XXX slab cache? */
	if (list_empty(&fp->fi_perfile)) {
		release_file(fp);
	}
}

1014
static int
1015 1016 1017 1018
cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
	return ((sop->so_owner.len == owner->len) && 
	 !memcmp(sop->so_owner.data, owner->data, owner->len) && 
	  (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1019 1020 1021 1022
}

/* search ownerstr_hashtbl[] for owner */
static int
1023
find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, struct nfs4_stateowner **op) {
1024 1025
	struct nfs4_stateowner *local = NULL;

1026
	list_for_each_entry(local, &ownerstr_hashtbl[hashval], so_strhash) {
1027
		if(!cmp_owner_str(local, &open->op_owner, &open->op_clientid)) 
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
			continue;
		*op = local;
		return(1);
	}
	return 0;
}

/* see if clientid is in confirmed hash table */
static int
verify_clientid(struct nfs4_client **client, clientid_t *clid) {

	struct nfs4_client *clp;
	unsigned int idhashval = clientid_hashval(clid->cl_id);

1042
	list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
		if (!cmp_clid(&clp->cl_clientid, clid))
			continue;
		*client = clp;
		return 1;
	}
	*client = NULL;
	return 0;
}

/* search file_hashtbl[] for file */
static int
1054
find_file(unsigned int hashval, struct inode *ino, struct nfs4_file **fp) {
1055 1056
	struct nfs4_file *local = NULL;

1057
	list_for_each_entry(local, &file_hashtbl[hashval], fi_hash) {
1058
		if (local->fi_inode == ino) {
1059 1060 1061 1062 1063 1064 1065
			*fp = local;
			return(1);
		}
	}
	return 0;
}

1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)

void
set_access(unsigned int *access, unsigned long bmap) {
	int i;

	*access = 0;
	for (i = 1; i < 4; i++) {
		if(test_bit(i, &bmap))
			*access |= i;
	}
}

void
set_deny(unsigned int *deny, unsigned long bmap) {
	int i;

	*deny = 0;
	for (i = 0; i < 4; i++) {
		if(test_bit(i, &bmap))
			*deny |= i ;
	}
}

1091 1092
static int
test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1093 1094 1095 1096 1097
	unsigned int access, deny;

	set_access(&access, stp->st_access_bmap);
	set_deny(&deny, stp->st_deny_bmap);
	if ((access & open->op_share_deny) || (deny & open->op_share_access))
1098 1099 1100 1101
		return 0;
	return 1;
}

1102 1103 1104 1105
/*
 * Called to check deny when READ with all zero stateid or
 * WRITE with all zero or all one stateid
 */
1106 1107 1108
int
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
{
1109
	struct inode *ino = current_fh->fh_dentry->d_inode;
1110 1111 1112 1113 1114 1115
	unsigned int fi_hashval;
	struct nfs4_file *fp;
	struct nfs4_stateid *stp;

	dprintk("NFSD: nfs4_share_conflict\n");

1116 1117
	fi_hashval = file_hashval(ino);
	if (find_file(fi_hashval, ino, &fp)) {
1118
	/* Search for conflicting share reservations */
1119
		list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1120 1121
			if (test_bit(deny_type, &stp->st_deny_bmap) ||
			    test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1122 1123 1124 1125 1126 1127
				return nfserr_share_denied;
		}
	}
	return nfs_ok;
}

1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
static inline int
nfs4_file_upgrade(struct file *filp, unsigned int share_access)
{
int status;

	if (share_access & NFS4_SHARE_ACCESS_WRITE) {
		status = get_write_access(filp->f_dentry->d_inode);
		if (!status)
			filp->f_mode = FMODE_WRITE;
		else
			return nfserrno(status);
	}
	return nfs_ok;
}

1143 1144 1145 1146 1147 1148 1149 1150 1151
static inline void
nfs4_file_downgrade(struct file *filp, unsigned int share_access)
{
	if (share_access & NFS4_SHARE_ACCESS_WRITE) {
		put_write_access(filp->f_dentry->d_inode);
		filp->f_mode = FMODE_READ;
	}
}

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165

/*
 * nfsd4_process_open1()
 * 	lookup stateowner.
 * 		found:
 * 			check confirmed 
 * 				confirmed:
 * 					check seqid
 * 				not confirmed:
 * 					delete owner
 * 					create new owner
 * 		notfound:
 * 			verify clientid
 * 			create new owner
1166 1167
 *
 * called with nfs4_lock_state() held.
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
 */
int
nfsd4_process_open1(struct nfsd4_open *open)
{
	int status;
	clientid_t *clientid = &open->op_clientid;
	struct nfs4_client *clp = NULL;
	unsigned int strhashval;
	struct nfs4_stateowner *sop = NULL;

	status = nfserr_inval;
	if (!check_name(open->op_owner))
		goto out;

	status = nfserr_stale_clientid;
	if (STALE_CLIENTID(&open->op_clientid))
1184
		return status;
1185 1186

	strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1187
	if (find_openstateowner_str(strhashval, open, &sop)) {
1188
		open->op_stateowner = sop;
1189
		/* check for replay */
1190
		if (open->op_seqid == sop->so_seqid){
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
			if (!sop->so_replay.rp_buflen) {
			/*
			* The original OPEN failed in so spectacularly that we
			* don't even have replay data saved!  Therefore, we
			* have no choice but to continue processing
			* this OPEN; presumably, we'll fail again for the same
			* reason.
			*/
				dprintk("nfsd4_process_open1: replay with no replay cache\n");
				status = NFS_OK;
				goto renew;
			}
			/* replay: indicate to calling function */
			status = NFSERR_REPLAY_ME;
1205
			return status;
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
		}
		if (sop->so_confirmed) {
			if (open->op_seqid == sop->so_seqid + 1) { 
				status = nfs_ok;
				goto renew;
			} 
			status = nfserr_bad_seqid;
			goto out;
		}
		/* If we get here, we received and OPEN for an unconfirmed
1216 1217
		 * nfs4_stateowner. 
		 * Since the sequid's are different, purge the 
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
		 * existing nfs4_stateowner, and instantiate a new one.
		 */
		clp = sop->so_client;
		release_stateowner(sop);
		goto instantiate_new_owner;
	} 
	/* nfs4_stateowner not found. 
	* verify clientid and instantiate new nfs4_stateowner
	* if verify fails this is presumably the result of the 
	* client's lease expiring.
	*
	* XXX compare clp->cl_addr with rqstp addr? 
	*/
	status = nfserr_expired;
	if (!verify_clientid(&clp, clientid))
		goto out;
instantiate_new_owner:
	status = nfserr_resource;
1236
	if (!(sop = alloc_init_open_stateowner(strhashval, clp, open))) 
1237 1238 1239 1240
		goto out;
	open->op_stateowner = sop;
	status = nfs_ok;
renew:
1241
	renew_client(sop->so_client);
1242
out:
1243 1244
	if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
		status = nfserr_reclaim_bad;
1245 1246
	return status;
}
1247 1248 1249
/*
 * called with nfs4_lock_state() held.
 */
1250 1251 1252 1253 1254
int
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
	struct iattr iattr;
	struct nfs4_stateowner *sop = open->op_stateowner;
1255
	struct nfs4_file *fp = NULL;
1256
	struct inode *ino;
1257 1258 1259 1260 1261 1262
	unsigned int fi_hashval;
	struct nfs4_stateid *stq, *stp = NULL;
	int status;

	status = nfserr_resource;
	if (!sop)
1263
		return status;
1264

1265
	ino = current_fh->fh_dentry->d_inode;
1266

1267 1268 1269 1270
	status = nfserr_inval;
	if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
		goto out;

1271 1272
	fi_hashval = file_hashval(ino);
	if (find_file(fi_hashval, ino, &fp)) {
1273 1274
		/* Search for conflicting share reservations */
		status = nfserr_share_denied;
1275
		list_for_each_entry(stq, &fp->fi_perfile, st_perfile) {
1276 1277 1278 1279
			if(stq->st_stateowner == sop) {
				stp = stq;
				continue;
			}
1280 1281 1282
			/* ignore lock owners */
			if (stq->st_stateowner->so_is_open_owner == 0)
				continue;
1283 1284 1285 1286 1287 1288
			if (!test_share(stq,open))	
				goto out;
		}
	} else {
	/* No nfs4_file found; allocate and init a new one */
		status = nfserr_resource;
1289
		if ((fp = alloc_init_file(fi_hashval, ino)) == NULL)
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
			goto out;
	}

	if (!stp) {
		int flags = 0;

		status = nfserr_resource;
		if ((stp = kmalloc(sizeof(struct nfs4_stateid),
						GFP_KERNEL)) == NULL)
			goto out;

1301
		if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1302 1303 1304 1305 1306 1307 1308 1309
			flags = MAY_WRITE;
		else
			flags = MAY_READ;
		if ((status = nfsd_open(rqstp, current_fh,  S_IFREG,
			                      flags,
			                      &stp->st_vfs_file)) != 0)
			goto out_free;

1310
		vfsopen++;
1311 1312 1313 1314 1315 1316 1317 1318 1319
		dget(stp->st_vfs_file.f_dentry);
		mntget(stp->st_vfs_file.f_vfsmnt);

		init_stateid(stp, fp, sop, open);
		stp->st_vfs_set = 1;
	} else {
		/* This is an upgrade of an existing OPEN. 
		 * OR the incoming share with the existing 
		 * nfs4_stateid share */
1320
		unsigned int share_access;
1321

1322 1323 1324
		set_access(&share_access, stp->st_access_bmap);
		share_access = ~share_access;
		share_access &= open->op_share_access;
1325 1326 1327 1328

		/* update the struct file */
		if ((status = nfs4_file_upgrade(&stp->st_vfs_file, share_access)))
			goto out;
1329 1330 1331
		/* remember the open */
		set_bit(open->op_share_access, &stp->st_access_bmap);
		set_bit(open->op_share_deny, &stp->st_deny_bmap);
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
		/* bump the stateid */
		update_stateid(&stp->st_stateid);
	}
	dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n\n",
	            stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
	            stp->st_stateid.si_fileid, stp->st_stateid.si_generation);

	if (open->op_truncate) {
		iattr.ia_valid = ATTR_SIZE;
		iattr.ia_size = 0;
		status = nfsd_setattr(rqstp, current_fh, &iattr, 0, (time_t)0);
		if (status)
			goto out;
	}
	memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));

	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
	status = nfs_ok;
out:
1351 1352 1353
	if (fp && list_empty(&fp->fi_perfile))
		release_file(fp);

1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
		if (status)
			status = nfserr_reclaim_bad;
		else {
		/* successful reclaim. so_seqid is decremented because
		* it will be bumped in encode_open
		*/
			open->op_stateowner->so_confirmed = 1;
			open->op_stateowner->so_seqid--;
		}
	}
1365 1366 1367 1368 1369 1370 1371
	/*
	* To finish the open response, we just need to set the rflags.
	*/
	open->op_rflags = 0;
	if (!open->op_stateowner->so_confirmed)
		open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;

1372 1373 1374 1375 1376
	return status;
out_free:
	kfree(stp);
	goto out;
}
1377

1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
static struct work_struct laundromat_work;
static void laundromat_main(void *);
static DECLARE_WORK(laundromat_work, laundromat_main, NULL);

int 
nfsd4_renew(clientid_t *clid)
{
	struct nfs4_client *clp;
	unsigned int idhashval;
	int status;

1389
	nfs4_lock_state();
1390
	dprintk("process_renew(%08x/%08x): starting\n", 
1391 1392 1393 1394 1395 1396
			clid->cl_boot, clid->cl_id);
	status = nfserr_stale_clientid;
	if (STALE_CLIENTID(clid))
		goto out;
	status = nfs_ok;
	idhashval = clientid_hashval(clid->cl_id);
1397
	list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1398 1399 1400 1401 1402
		if (!cmp_clid(&clp->cl_clientid, clid))
			continue;
		renew_client(clp);
		goto out;
	}
1403
	list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
		if (!cmp_clid(&clp->cl_clientid, clid))
			continue;
		renew_client(clp);
	goto out;
	}
	/*
	* Couldn't find an nfs4_client for this clientid.  
	* Presumably this is because the client took too long to 
	* RENEW, so return NFS4ERR_EXPIRED.
	*/
1414
	dprintk("nfsd4_renew: clientid not found!\n");
1415 1416
	status = nfserr_expired;
out:
1417
	nfs4_unlock_state();
1418 1419 1420 1421 1422 1423 1424
	return status;
}

time_t
nfs4_laundromat(void)
{
	struct nfs4_client *clp;
1425
	struct nfs4_stateowner *sop;
1426 1427
	struct list_head *pos, *next;
	time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1428 1429
	time_t t, clientid_val = NFSD_LEASE_TIME;
	time_t u, close_val = NFSD_LEASE_TIME;
1430

1431
	nfs4_lock_state();
1432 1433 1434 1435 1436 1437

	dprintk("NFSD: laundromat service - starting, examining clients\n");
	list_for_each_safe(pos, next, &client_lru) {
		clp = list_entry(pos, struct nfs4_client, cl_lru);
		if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
			t = clp->cl_time - cutoff;
1438 1439
			if (clientid_val > t)
				clientid_val = t;
1440 1441 1442 1443 1444 1445
			break;
		}
		dprintk("NFSD: purging unused client (clientid %08x)\n",
			clp->cl_clientid.cl_id);
		expire_client(clp);
	}
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
	list_for_each_safe(pos, next, &close_lru) {
		sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
		if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
			u = sop->so_time - cutoff;
			if (close_val > u)
				close_val = u;
			break;
		}
		dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
			sop->so_id);
		release_stateowner(sop);
	}
	if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
		clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1460
	nfs4_unlock_state();
1461
	return clientid_val;
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
}

void
laundromat_main(void *not_used)
{
	time_t t;

	t = nfs4_laundromat();
	dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
	schedule_delayed_work(&laundromat_work, t*HZ);
}
1473

1474 1475 1476
/* search ownerid_hashtbl[] and close_lru for stateid owner
 * (stateid->si_stateownerid)
 */
1477
struct nfs4_stateowner *
1478
find_openstateowner_id(u32 st_id, int flags) {
1479 1480
	struct nfs4_stateowner *local = NULL;

1481 1482 1483 1484 1485 1486
	dprintk("NFSD: find_openstateowner_id %d\n", st_id);
	if (flags & CLOSE_STATE) {
		list_for_each_entry(local, &close_lru, so_close_lru) {
			if(local->so_id == st_id)
				return local;
		}
1487 1488 1489 1490 1491 1492 1493
	}
	return NULL;
}

static inline int
nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
{
1494 1495
	return (stp->st_vfs_set == 0 ||
		fhp->fh_dentry->d_inode != stp->st_vfs_file.f_dentry->d_inode);
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
}

static int
STALE_STATEID(stateid_t *stateid)
{
	if (stateid->si_boot == boot_time)
		return 0;
	printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
		stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
		stateid->si_generation);
	return 1;
}


1510 1511 1512 1513 1514 1515 1516 1517 1518
/*
* Checks for stateid operations
*/
int
nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct nfs4_stateid **stpp)
{
	struct nfs4_stateid *stp;
	int status;

1519
	dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
		stateid->si_boot, stateid->si_stateownerid, 
		stateid->si_fileid, stateid->si_generation); 

	*stpp = NULL;

	/* STALE STATEID */
	status = nfserr_stale_stateid;
	if (STALE_STATEID(stateid)) 
		goto out;

	/* BAD STATEID */
	status = nfserr_bad_stateid;
1532 1533
	if (!(stp = find_stateid(stateid, flags))) {
		dprintk("NFSD: preprocess_stateid_op: no open stateid!\n");
1534 1535 1536
		goto out;
	}
	if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
1537
		dprintk("NFSD: preprocess_stateid_op: fh-stateid mismatch!\n");
1538
		stp->st_vfs_set = 0;
1539 1540 1541
		goto out;
	}
	if (!stp->st_stateowner->so_confirmed) {
1542
		dprintk("preprocess_stateid_op: lockowner not confirmed yet!\n");
1543 1544 1545
		goto out;
	}
	if (stateid->si_generation > stp->st_stateid.si_generation) {
1546
		dprintk("preprocess_stateid_op: future stateid?!\n");
1547 1548 1549 1550 1551 1552
		goto out;
	}

	/* OLD STATEID */
	status = nfserr_old_stateid;
	if (stateid->si_generation < stp->st_stateid.si_generation) {
1553
		dprintk("preprocess_stateid_op: old stateid!\n");
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
		goto out;
	}
	*stpp = stp;
	status = nfs_ok;
	renew_client(stp->st_stateowner->so_client);
out:
	return status;
}


1564 1565 1566 1567
/* 
 * Checks for sequence id mutating operations. 
 */
int
1568
nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
{
	int status;
	struct nfs4_stateid *stp;
	struct nfs4_stateowner *sop;

	dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
			"stateid = (%08x/%08x/%08x/%08x)\n", seqid,
		stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
		stateid->si_generation);
			        
	*stpp = NULL;
	*sopp = NULL;

	status = nfserr_bad_stateid;
	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
		printk("NFSD: preprocess_seqid_op: magic stateid!\n");
		goto out;
	}

	status = nfserr_stale_stateid;
	if (STALE_STATEID(stateid))
		goto out;
	/*
	* We return BAD_STATEID if filehandle doesn't match stateid, 
	* the confirmed flag is incorrecly set, or the generation 
	* number is incorrect.  
	* If there is no entry in the openfile table for this id, 
	* we can't always return BAD_STATEID;
	* this might be a retransmitted CLOSE which has arrived after 
	* the openfile has been released.
	*/
1600
	if (!(stp = find_stateid(stateid, flags)))
1601 1602 1603 1604
		goto no_nfs4_stateid;

	status = nfserr_bad_stateid;

1605 1606 1607 1608 1609 1610
	/* for new lock stateowners:
	 * check that the lock->v.new.open_stateid
	 * refers to an open stateowner
	 *
	 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
	 * as the open_stateid->st_stateowner->so_client->clientid
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
	 */
	if (lockclid) {
		struct nfs4_stateowner *sop = stp->st_stateowner;
		struct nfs4_client *clp = sop->so_client;

		if (!sop->so_is_open_owner)
			goto out;
		if (!cmp_clid(&clp->cl_clientid, lockclid))
			goto out;
	}

1622 1623
	if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
		printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
1624
		stp->st_vfs_set = 0;
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
		goto out;
	}

	*stpp = stp;
	*sopp = sop = stp->st_stateowner;

	/*
	*  We now validate the seqid and stateid generation numbers.
	*  For the moment, we ignore the possibility of 
	*  generation number wraparound.
	*/
	if (seqid != sop->so_seqid + 1)
		goto check_replay;

	if (sop->so_confirmed) {
		if (flags & CONFIRM) {
			printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
			goto out;
		}
	}
	else {
		if (!(flags & CONFIRM)) {
			printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
			goto out;
		}
	}
	if (stateid->si_generation > stp->st_stateid.si_generation) {
		printk("NFSD: preprocess_seqid_op: future stateid?!\n");
		goto out;
	}

	status = nfserr_old_stateid;
	if (stateid->si_generation < stp->st_stateid.si_generation) {
		printk("NFSD: preprocess_seqid_op: old stateid!\n");
		goto out;
	}
	/* XXX renew the client lease here */
	status = nfs_ok;

out:
	return status;

no_nfs4_stateid:

	/*
	* We determine whether this is a bad stateid or a replay, 
	* starting by trying to look up the stateowner.
	* If stateowner is not found - stateid is bad.
	*/
1674
	if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
1675 1676 1677 1678
		printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
		status = nfserr_bad_stateid;
		goto out;
	}
1679
	*sopp = sop;
1680 1681 1682 1683

check_replay:
	if (seqid == sop->so_seqid) {
		printk("NFSD: preprocess_seqid_op: retransmission?\n");
1684 1685
		/* indicate replay to calling function */
		status = NFSERR_REPLAY_ME;
1686
	} else  {
1687 1688
		printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);

1689
		*sopp = NULL;
1690
		status = nfserr_bad_seqid;
1691
	}
1692 1693 1694
	goto out;
}

1695 1696 1697
/*
 * nfs4_unlock_state(); called in encode
 */
1698 1699 1700 1701 1702 1703 1704
int
nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
{
	int status;
	struct nfs4_stateowner *sop;
	struct nfs4_stateid *stp;

1705
	dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
1706
			(int)current_fh->fh_dentry->d_name.len,
1707
			current_fh->fh_dentry->d_name.name);
1708 1709 1710 1711

	if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
		goto out;

1712
	oc->oc_stateowner = NULL;
1713
	nfs4_lock_state();
1714 1715 1716

	if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
					&oc->oc_req_stateid,
1717
					CHECK_FH | CONFIRM | OPEN_STATE,
1718
					&oc->oc_stateowner, &stp, NULL)))
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
		goto out; 

	sop = oc->oc_stateowner;
	sop->so_confirmed = 1;
	update_stateid(&stp->st_stateid);
	memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
	dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
		"stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
		         stp->st_stateid.si_boot,
		         stp->st_stateid.si_stateownerid,
		         stp->st_stateid.si_fileid,
		         stp->st_stateid.si_generation);
	status = nfs_ok;
out:
	return status;
}
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760


/*
 * unset all bits in union bitmap (bmap) that
 * do not exist in share (from successful OPEN_DOWNGRADE)
 */
static void
reset_union_bmap_access(unsigned long access, unsigned long *bmap)
{
	int i;
	for (i = 1; i < 4; i++) {
		if ((i & access) != i)
			__clear_bit(i, bmap);
	}
}

static void
reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
{
	int i;
	for (i = 0; i < 4; i++) {
		if ((i & deny) != i)
			__clear_bit(i, bmap);
	}
}

1761 1762 1763
/*
 * nfs4_unlock_state(); called in encode
 */
1764

1765 1766 1767 1768 1769
int
nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
{
	int status;
	struct nfs4_stateid *stp;
1770
	unsigned int share_access;
1771 1772

	dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
1773
			(int)current_fh->fh_dentry->d_name.len,
1774 1775
			current_fh->fh_dentry->d_name.name);

1776
	od->od_stateowner = NULL;
1777 1778 1779 1780
	status = nfserr_inval;
	if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
		goto out;

1781
	nfs4_lock_state();
1782 1783
	if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
					&od->od_stateid, 
1784
					CHECK_FH | OPEN_STATE, 
1785
					&od->od_stateowner, &stp, NULL)))
1786 1787 1788
		goto out; 

	status = nfserr_inval;
1789 1790 1791
	if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
		dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
			stp->st_access_bmap, od->od_share_access);
1792 1793
		goto out;
	}
1794 1795 1796
	if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
		dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
			stp->st_deny_bmap, od->od_share_deny);
1797 1798
		goto out;
	}
1799
	set_access(&share_access, stp->st_access_bmap);
1800
	nfs4_file_downgrade(&stp->st_vfs_file, 
1801 1802 1803 1804 1805
	                    share_access & ~od->od_share_access);

	reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
	reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);

1806 1807 1808 1809 1810 1811 1812
	update_stateid(&stp->st_stateid);
	memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
	status = nfs_ok;
out:
	return status;
}

1813 1814 1815
/*
 * nfs4_unlock_state() called after encode
 */
1816 1817 1818 1819 1820 1821 1822
int
nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
{
	int status;
	struct nfs4_stateid *stp;

	dprintk("NFSD: nfsd4_close on file %.*s\n", 
1823
			(int)current_fh->fh_dentry->d_name.len,
1824 1825
			current_fh->fh_dentry->d_name.name);

1826
	close->cl_stateowner = NULL;
1827
	nfs4_lock_state();
1828
	/* check close_lru for replay */
1829 1830
	if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
					&close->cl_stateid, 
1831
					CHECK_FH | OPEN_STATE | CLOSE_STATE,
1832
					&close->cl_stateowner, &stp, NULL)))
1833 1834 1835 1836 1837 1838 1839 1840
		goto out; 
	/*
	*  Return success, but first update the stateid.
	*/
	status = nfs_ok;
	update_stateid(&stp->st_stateid);
	memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));

1841 1842
	/* release_state_owner() calls nfsd_close() if needed */
	release_state_owner(stp, &close->cl_stateowner, OPEN_STATE);
1843 1844 1845 1846
out:
	return status;
}

1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
/* 
 * Lock owner state (byte-range locks)
 */
#define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
#define LOCK_HASH_BITS              8
#define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
#define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)

#define lockownerid_hashval(id) \
        ((id) & LOCK_HASH_MASK)
#define lock_ownerstr_hashval(x, clientid, ownername) \
        ((file_hashval(x) + (clientid) + opaque_hashval((ownername.data), (ownername.len))) & LOCK_HASH_MASK)

static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
static struct list_head	lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];

struct nfs4_stateid *
find_stateid(stateid_t *stid, int flags)
{
	struct nfs4_stateid *local = NULL;
	u32 st_id = stid->si_stateownerid;
	u32 f_id = stid->si_fileid;
	unsigned int hashval;

	dprintk("NFSD: find_stateid flags 0x%x\n",flags);
	if ((flags & LOCK_STATE) || (flags & RDWR_STATE)) {
		hashval = stateid_hashval(st_id, f_id);
1875
		list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
1876 1877 1878 1879 1880 1881 1882
			if((local->st_stateid.si_stateownerid == st_id) &&
			   (local->st_stateid.si_fileid == f_id))
				return local;
		}
	} 
	if ((flags & OPEN_STATE) || (flags & RDWR_STATE)) {
		hashval = stateid_hashval(st_id, f_id);
1883
		list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
			if((local->st_stateid.si_stateownerid == st_id) &&
			   (local->st_stateid.si_fileid == f_id))
				return local;
		}
	} else
		printk("NFSD: find_stateid: ERROR: no state flag\n");
	return NULL;
}


/*
 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
 * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
 * locking, this prevents us from being completely protocol-compliant.  The
 * real solution to this problem is to start using unsigned file offsets in
 * the VFS, but this is a very deep change!
 */
static inline void
nfs4_transform_lock_offset(struct file_lock *lock)
{
	if (lock->fl_start < 0)
		lock->fl_start = OFFSET_MAX;
	if (lock->fl_end < 0)
		lock->fl_end = OFFSET_MAX;
}

int
nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
{
	struct nfs4_stateowner *local = NULL;
	int status = 0;
			        
	if (hashval >= LOCK_HASH_SIZE)
		goto out;
1919
	list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
		if (local == sop) {
			status = 1;
			goto out;
		}
	}
out:
	return status;
}


static inline void
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
{
	struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;

	deny->ld_sop = NULL;
	if (nfs4_verify_lock_stateowner(sop, fl->fl_pid))
		deny->ld_sop = sop;
	deny->ld_start = fl->fl_start;
	deny->ld_length = ~(u64)0;
	if (fl->fl_end != ~(u64)0)
		deny->ld_length = fl->fl_end - fl->fl_start + 1;        
	deny->ld_type = NFS4_READ_LT;
	if (fl->fl_type != F_RDLCK)
		deny->ld_type = NFS4_WRITE_LT;
}

1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
static struct nfs4_stateowner *
find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
{
	struct nfs4_stateowner *local = NULL;
	int i;

	for (i = 0; i < LOCK_HASH_SIZE; i++) {
		list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
			if(!cmp_owner_str(local, owner, clid))
				continue;
			return local;
		}
	}
	return NULL;
}
1962 1963 1964 1965 1966

static int
find_lockstateowner_str(unsigned int hashval, struct xdr_netobj *owner, clientid_t *clid, struct nfs4_stateowner **op) {
	struct nfs4_stateowner *local = NULL;

1967
	list_for_each_entry(local, &lock_ownerstr_hashtbl[hashval], so_strhash) {
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986
		if(!cmp_owner_str(local, owner, clid)) 
			continue;
		*op = local;
		return(1);
	}
	*op = NULL;
	return 0;
}

/*
 * Alloc a lock owner structure.
 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
 * occured. 
 *
 * strhashval = lock_ownerstr_hashval 
 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode 
 */

static struct nfs4_stateowner *
1987
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
	struct nfs4_stateowner *sop;
	struct nfs4_replay *rp;
	unsigned int idhashval;

	if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
		return (struct nfs4_stateowner *)NULL;
	idhashval = lockownerid_hashval(current_ownerid);
	INIT_LIST_HEAD(&sop->so_idhash);
	INIT_LIST_HEAD(&sop->so_strhash);
	INIT_LIST_HEAD(&sop->so_perclient);
	INIT_LIST_HEAD(&sop->so_perfilestate);
1999
	INIT_LIST_HEAD(&sop->so_perlockowner);
2000 2001
	INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
	sop->so_time = 0;
2002 2003 2004
	list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
	list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
	list_add(&sop->so_perclient, &clp->cl_perclient);
2005
	list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
	add_perclient++;
	sop->so_is_open_owner = 0;
	sop->so_id = current_ownerid++;
	sop->so_client = clp;
	sop->so_seqid = lock->lk_new_lock_seqid - 1;
	sop->so_confirmed = 1;
	rp = &sop->so_replay;
	rp->rp_status = NFSERR_SERVERFAULT;
	rp->rp_buflen = 0;
	rp->rp_buf = rp->rp_ibuf;
	alloc_lsowner++;
	return sop;
}

struct nfs4_stateid *
alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
{
	struct nfs4_stateid *stp;
	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);

	if ((stp = kmalloc(sizeof(struct nfs4_stateid), 
					GFP_KERNEL)) == NULL)
		goto out;
	INIT_LIST_HEAD(&stp->st_hash);
	INIT_LIST_HEAD(&stp->st_perfile);
	INIT_LIST_HEAD(&stp->st_perfilestate);
2032
	INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044
	list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
	list_add(&stp->st_perfile, &fp->fi_perfile);
	list_add_perfile++;
	list_add(&stp->st_perfilestate, &sop->so_perfilestate);
	stp->st_stateowner = sop;
	stp->st_file = fp;
	stp->st_stateid.si_boot = boot_time;
	stp->st_stateid.si_stateownerid = sop->so_id;
	stp->st_stateid.si_fileid = fp->fi_id;
	stp->st_stateid.si_generation = 0;
	stp->st_vfs_file = open_stp->st_vfs_file;
	stp->st_vfs_set = open_stp->st_vfs_set;
2045 2046
	stp->st_access_bmap = open_stp->st_access_bmap;
	stp->st_deny_bmap = open_stp->st_deny_bmap;
2047 2048 2049 2050 2051

out:
	return stp;
}

2052 2053 2054 2055 2056 2057 2058
int
check_lock_length(u64 offset, u64 length)
{
	return ((length == 0)  || ((length != ~(u64)0) &&
 	     LOFF_OVERFLOW(offset, length)));
}

2059 2060
/*
 *  LOCK operation 
2061 2062
 *
 * nfs4_unlock_state(); called in encode
2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
 */
int
nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
{
	struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
	struct nfs4_stateid *lock_stp;
	struct file *filp;
	struct file_lock file_lock;
	struct file_lock *conflock;
	int status = 0;
	unsigned int strhashval;

	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2076 2077
		(long long) lock->lk_offset,
		(long long) lock->lk_length);
2078

2079 2080 2081 2082 2083
	if (nfs4_in_grace() && !lock->lk_reclaim)
		return nfserr_grace;
	if (nfs4_in_no_grace() && lock->lk_reclaim)
		return nfserr_no_grace;

2084 2085 2086
	if (check_lock_length(lock->lk_offset, lock->lk_length))
		 return nfserr_inval;

2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
	lock->lk_stateowner = NULL;
	nfs4_lock_state();

	if (lock->lk_is_new) {
	/*
	 * Client indicates that this is a new lockowner.
	 * Use open owner and open stateid to create lock owner and lock 
	 * stateid.
	 */
		struct nfs4_stateid *open_stp = NULL;
		struct nfs4_file *fp;
		
		status = nfserr_stale_clientid;
		if (STALE_CLIENTID(&lock->lk_new_clientid)) {
			printk("NFSD: nfsd4_lock: clientid is stale!\n");
			goto out;
		}
2104 2105 2106 2107 2108

		/* is the new lock seqid presented by the client zero? */
		status = nfserr_bad_seqid;
		if (lock->v.new.lock_seqid != 0)
			goto out;
2109

2110 2111 2112 2113 2114
		/* validate and update open stateid and open seqid */
		status = nfs4_preprocess_seqid_op(current_fh, 
				        lock->lk_new_open_seqid,
		                        &lock->lk_new_open_stateid,
		                        CHECK_FH | OPEN_STATE,
2115 2116
		                        &open_sop, &open_stp,
					&lock->v.new.clientid);
2117 2118 2119
		if (status) {
			if (lock->lk_reclaim)
				status = nfserr_reclaim_bad;
2120
			goto out;
2121
		}
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
		/* create lockowner and lock stateid */
		fp = open_stp->st_file;
		strhashval = lock_ownerstr_hashval(fp->fi_inode, 
				open_sop->so_client->cl_clientid.cl_id, 
				lock->v.new.owner);
		/* 
		 * If we already have this lock owner, the client is in 
		 * error (or our bookeeping is wrong!) 
		 * for asking for a 'new lock'.
		 */
		status = nfserr_bad_stateid;
2133 2134 2135
		lock_sop = find_lockstateowner(&lock->v.new.owner,
						&lock->v.new.clientid);
		if (lock_sop)
2136 2137
			goto out;
		status = nfserr_resource;
2138
		if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
			goto out;
		if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 
						fp, open_stp)) == NULL)
			goto out;
		/* bump the open seqid used to create the lock */
		open_sop->so_seqid++;
	} else {
		/* lock (lock owner + lock stateid) already exists */
		status = nfs4_preprocess_seqid_op(current_fh,
				       lock->lk_old_lock_seqid, 
				       &lock->lk_old_lock_stateid, 
				       CHECK_FH | LOCK_STATE, 
2151
				       &lock->lk_stateowner, &lock_stp, NULL);
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241
		if (status)
			goto out;
	}
	/* lock->lk_stateowner and lock_stp have been created or found */
	filp = &lock_stp->st_vfs_file;

	if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
		printk("NFSD: nfsd4_lock: permission denied!\n");
		goto out;
	}

	switch (lock->lk_type) {
		case NFS4_READ_LT:
		case NFS4_READW_LT:
			file_lock.fl_type = F_RDLCK;
		break;
		case NFS4_WRITE_LT:
		case NFS4_WRITEW_LT:
			file_lock.fl_type = F_WRLCK;
		break;
		default:
			status = nfserr_inval;
		goto out;
	}
	file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
	file_lock.fl_pid = lockownerid_hashval(lock->lk_stateowner->so_id);
	file_lock.fl_file = filp;
	file_lock.fl_flags = FL_POSIX;
	file_lock.fl_notify = NULL;
	file_lock.fl_insert = NULL;
	file_lock.fl_remove = NULL;

	file_lock.fl_start = lock->lk_offset;
	if ((lock->lk_length == ~(u64)0) || 
			LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
		file_lock.fl_end = ~(u64)0;
	else
		file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
	nfs4_transform_lock_offset(&file_lock);

	/*
	* Try to lock the file in the VFS.
	* Note: locks.c uses the BKL to protect the inode's lock list.
	*/

	status = posix_lock_file(filp, &file_lock);
	dprintk("NFSD: nfsd4_lock: posix_test_lock passed. posix_lock_file status %d\n",status);
	switch (-status) {
	case 0: /* success! */
		update_stateid(&lock_stp->st_stateid);
		memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
				sizeof(stateid_t));
		goto out;
	case (EAGAIN):
		goto conflicting_lock;
	case (EDEADLK):
		status = nfserr_deadlock;
	default:        
		dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
		goto out_destroy_new_stateid;
	}

conflicting_lock:
	dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
	status = nfserr_denied;
	/* XXX There is a race here. Future patch needed to provide 
	 * an atomic posix_lock_and_test_file
	 */
	if (!(conflock = posix_test_lock(filp, &file_lock))) {
		status = nfserr_serverfault;
		goto out;
	}
	nfs4_set_lock_denied(conflock, &lock->lk_denied);

out_destroy_new_stateid:
	if (lock->lk_is_new) {
		dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
	/*
	* An error encountered after instantiation of the new
	* stateid has forced us to destroy it.
	*/
		if (!seqid_mutating_err(status))
			open_sop->so_seqid--;

		release_state_owner(lock_stp, &lock->lk_stateowner, LOCK_STATE);
	}
out:
	return status;
}

2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
/*
 * LOCKT operation
 */
int
nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
{
	struct inode *inode;
	struct nfs4_stateowner *sop;
	struct file file;
	struct file_lock file_lock;
	struct file_lock *conflicting_lock;
	unsigned int strhashval;
	int status;

2256 2257 2258
	if (nfs4_in_grace())
		return nfserr_grace;

2259 2260 2261
	if (check_lock_length(lockt->lt_offset, lockt->lt_length))
		 return nfserr_inval;

2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
	lockt->lt_stateowner = NULL;
	nfs4_lock_state();

	status = nfserr_stale_clientid;
	if (STALE_CLIENTID(&lockt->lt_clientid)) {
		printk("NFSD: nfsd4_lockt: clientid is stale!\n");
		goto out;
	}

	if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
		printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2273 2274
		if (status == nfserr_symlink)
			status = nfserr_inval;
2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
		goto out;
	}

	inode = current_fh->fh_dentry->d_inode;
	switch (lockt->lt_type) {
		case NFS4_READ_LT:
		case NFS4_READW_LT:
			file_lock.fl_type = F_RDLCK;
		break;
		case NFS4_WRITE_LT:
		case NFS4_WRITEW_LT:
			file_lock.fl_type = F_WRLCK;
		break;
		default:
			printk("NFSD: nfs4_lockt: bad lock type!\n");
			status = nfserr_inval;
		goto out;
	}

	strhashval = lock_ownerstr_hashval(inode, 
			lockt->lt_clientid.cl_id, lockt->lt_owner);

2297
	find_lockstateowner_str(strhashval, &lockt->lt_owner,
2298
					&lockt->lt_clientid, 
2299
					&lockt->lt_stateowner);
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336
	sop = lockt->lt_stateowner;
	if (sop) {
		file_lock.fl_owner = (fl_owner_t) sop;
		file_lock.fl_pid = lockownerid_hashval(sop->so_id);
	} else {
		file_lock.fl_owner = NULL;
		file_lock.fl_pid = 0;
	}
	file_lock.fl_flags = FL_POSIX;

	file_lock.fl_start = lockt->lt_offset;
	if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
		file_lock.fl_end = ~(u64)0;
	else
		file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;

	nfs4_transform_lock_offset(&file_lock);

	/* posix_test_lock uses the struct file _only_ to resolve the inode.
	 * since LOCKT doesn't require an OPEN, and therefore a struct
	 * file may not exist, pass posix_test_lock a struct file with
	 * only the dentry:inode set.
	 */
	memset(&file, 0, sizeof (struct file));
	file.f_dentry = current_fh->fh_dentry;

	status = nfs_ok;
	conflicting_lock = posix_test_lock(&file, &file_lock);
	if (conflicting_lock) {
		status = nfserr_denied;
		nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
	}
out:
	nfs4_unlock_state();
	return status;
}

2337 2338 2339 2340 2341 2342 2343 2344 2345
int
nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
{
	struct nfs4_stateid *stp;
	struct file *filp = NULL;
	struct file_lock file_lock;
	int status;
						        
	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2346 2347
		(long long) locku->lu_offset,
		(long long) locku->lu_length);
2348 2349 2350 2351

	if (check_lock_length(locku->lu_offset, locku->lu_length))
		 return nfserr_inval;

2352
	locku->lu_stateowner = NULL;
2353 2354 2355 2356 2357 2358
	nfs4_lock_state();
									        
	if ((status = nfs4_preprocess_seqid_op(current_fh, 
					locku->lu_seqid, 
					&locku->lu_stateid, 
					CHECK_FH | LOCK_STATE, 
2359
					&locku->lu_stateowner, &stp, NULL)))
2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
		goto out;

	filp = &stp->st_vfs_file;
	BUG_ON(!filp);
	file_lock.fl_type = F_UNLCK;
	file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
	file_lock.fl_pid = lockownerid_hashval(locku->lu_stateowner->so_id);
	file_lock.fl_file = filp;
	file_lock.fl_flags = FL_POSIX; 
	file_lock.fl_notify = NULL;
	file_lock.fl_insert = NULL;
	file_lock.fl_remove = NULL;
	file_lock.fl_start = locku->lu_offset;

	if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
		file_lock.fl_end = ~(u64)0;
	else
		file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
	nfs4_transform_lock_offset(&file_lock);

	/*
	*  Try to unlock the file in the VFS.
	*/
	status = posix_lock_file(filp, &file_lock); 
	if (status) {
		printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
		goto out_nfserr;
	}
	/*
	* OK, unlock succeeded; the only thing left to do is update the stateid.
	*/
	update_stateid(&stp->st_stateid);
	memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));

out:
	return status;

out_nfserr:
	status = nfserrno(status);
	goto out;
}
2401

2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
/*
 * returns
 * 	1: locks held by lockowner
 * 	0: no locks held by lockowner
 */
static int
check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
{
	struct file_lock **flpp;
	struct inode *inode = filp->f_dentry->d_inode;
	int status = 0;

	lock_kernel();
	for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
		if ((*flpp)->fl_owner == (fl_owner_t)lowner)
			status = 1;
			goto out;
	}
out:
	unlock_kernel();
	return status;
}

int
nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
{
	clientid_t *clid = &rlockowner->rl_clientid;
	struct nfs4_stateowner *local = NULL;
	struct xdr_netobj *owner = &rlockowner->rl_owner;
2431
	int status;
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446

	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
		clid->cl_boot, clid->cl_id);

	/* XXX check for lease expiration */

	status = nfserr_stale_clientid;
	if (STALE_CLIENTID(clid)) {
		printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
		return status;
	}

	nfs4_lock_state();

        status = nfs_ok;
2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458
	local = find_lockstateowner(owner, clid);
	if (local) {
		struct nfs4_stateid *stp;

		/* check for any locks held by any stateid
		 * associated with the (lock) stateowner */
		status = nfserr_locks_held;
		list_for_each_entry(stp, &local->so_perfilestate,
				st_perfilestate) {
			if(stp->st_vfs_set) {
				if (check_for_locks(&stp->st_vfs_file, local))
					goto out;
2459
			}
2460 2461 2462 2463 2464
		}
		/* no locks held by (lock) stateowner */
		status = nfs_ok;
		release_stateowner(local);
	}
2465 2466 2467 2468 2469
out:
	nfs4_unlock_state();
	return status;
}

2470 2471 2472 2473
/* 
 * Start and stop routines
 */

2474
void 
2475 2476 2477
nfs4_state_init(void)
{
	int i;
2478
	time_t start = get_seconds();
2479

2480 2481
	if (nfs4_init)
		return;
2482 2483 2484 2485 2486 2487
	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
		INIT_LIST_HEAD(&conf_id_hashtbl[i]);
		INIT_LIST_HEAD(&conf_str_hashtbl[i]);
		INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
		INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
	}
2488 2489 2490 2491 2492
	for (i = 0; i < FILE_HASH_SIZE; i++) {
		INIT_LIST_HEAD(&file_hashtbl[i]);
	}
	for (i = 0; i < OWNER_HASH_SIZE; i++) {
		INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
2493 2494
		INIT_LIST_HEAD(&ownerid_hashtbl[i]);
	}
2495 2496
	for (i = 0; i < STATEID_HASH_SIZE; i++) {
		INIT_LIST_HEAD(&stateid_hashtbl[i]);
2497 2498 2499 2500 2501
		INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
	}
	for (i = 0; i < LOCK_HASH_SIZE; i++) {
		INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
		INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
2502
	}
2503 2504 2505
	memset(&zerostateid, 0, sizeof(stateid_t));
	memset(&onestateid, ~0, sizeof(stateid_t));

2506
	INIT_LIST_HEAD(&close_lru);
2507
	INIT_LIST_HEAD(&client_lru);
2508
	init_MUTEX(&client_sema);
2509 2510
	boot_time = start;
	grace_end = start + NFSD_LEASE_TIME;
2511 2512
	INIT_WORK(&laundromat_work,laundromat_main, NULL);
	schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
2513
	nfs4_init = 1;
2514

2515 2516
}

2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529
int
nfs4_in_grace(void)
{
	return time_before(get_seconds(), (unsigned long)grace_end);
}

int
nfs4_in_no_grace(void)
{
	return (grace_end < get_seconds());
}


2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
static void
__nfs4_state_shutdown(void)
{
	int i;
	struct nfs4_client *clp = NULL;

	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
		while (!list_empty(&conf_id_hashtbl[i])) {
			clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
			expire_client(clp);
		}
		while (!list_empty(&unconf_str_hashtbl[i])) {
			clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
			expire_client(clp);
		}
	}
2546
	release_all_files();
2547 2548
	cancel_delayed_work(&laundromat_work);
	flush_scheduled_work();
2549
	nfs4_init = 0;
2550 2551 2552 2553
	dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
			list_add_perfile, list_del_perfile);
	dprintk("NFSD: add_perclient %d del_perclient %d\n",
			add_perclient, del_perclient);
2554 2555
	dprintk("NFSD: alloc_file %d free_file %d\n",
			alloc_file, free_file);
2556 2557
	dprintk("NFSD: alloc_sowner %d alloc_lsowner %d free_sowner %d\n",
			alloc_sowner, alloc_lsowner, free_sowner);
2558 2559
	dprintk("NFSD: vfsopen %d vfsclose %d\n",
			vfsopen, vfsclose);
2560 2561 2562 2563 2564
}

void
nfs4_state_shutdown(void)
{
2565
	nfs4_lock_state();
2566
	__nfs4_state_shutdown();
2567
	nfs4_unlock_state();
2568
}