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/pagemap.h>
  41#include <linux/ratelimit.h>
  42#include <linux/sunrpc/svcauth_gss.h>
  43#include <linux/sunrpc/addr.h>
 
 
 
 
 
 
  44#include "xdr4.h"
  45#include "xdr4cb.h"
  46#include "vfs.h"
  47#include "current_stateid.h"
  48
  49#include "netns.h"
 
 
 
  50
  51#define NFSDDBG_FACILITY                NFSDDBG_PROC
  52
  53#define all_ones {{~0,~0},~0}
  54static const stateid_t one_stateid = {
  55	.si_generation = ~0,
  56	.si_opaque = all_ones,
  57};
  58static const stateid_t zero_stateid = {
  59	/* all fields zero */
  60};
  61static const stateid_t currentstateid = {
  62	.si_generation = 1,
  63};
 
 
 
  64
  65static u64 current_sessionid = 1;
  66
  67#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  68#define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  69#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
 
  70
  71/* forward declarations */
  72static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
 
 
 
 
 
  73
  74/* Locking: */
  75
  76/* Currently used for almost all code touching nfsv4 state: */
  77static DEFINE_MUTEX(client_mutex);
  78
  79/*
  80 * Currently used for the del_recall_lru and file hash table.  In an
  81 * effort to decrease the scope of the client_mutex, this spinlock may
  82 * eventually cover more:
  83 */
  84static DEFINE_SPINLOCK(recall_lock);
  85
  86static struct kmem_cache *openowner_slab = NULL;
  87static struct kmem_cache *lockowner_slab = NULL;
  88static struct kmem_cache *file_slab = NULL;
  89static struct kmem_cache *stateid_slab = NULL;
  90static struct kmem_cache *deleg_slab = NULL;
  91
  92void
  93nfs4_lock_state(void)
  94{
  95	mutex_lock(&client_mutex);
  96}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  97
  98static void free_session(struct nfsd4_session *);
  99
 100static bool is_session_dead(struct nfsd4_session *ses)
 101{
 102	return ses->se_flags & NFS4_SESSION_DEAD;
 103}
 104
 105void nfsd4_put_session(struct nfsd4_session *ses)
 
 
 106{
 107	if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 108		free_session(ses);
 
 
 
 
 109}
 110
 111static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 112{
 113	if (atomic_read(&ses->se_ref) > ref_held_by_me)
 114		return nfserr_jukebox;
 115	ses->se_flags |= NFS4_SESSION_DEAD;
 116	return nfs_ok;
 117}
 118
 119static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 120{
 121	if (is_session_dead(ses))
 122		return nfserr_badsession;
 123	atomic_inc(&ses->se_ref);
 124	return nfs_ok;
 125}
 126
 127void
 128nfs4_unlock_state(void)
 129{
 130	mutex_unlock(&client_mutex);
 
 
 
 131}
 132
 133static bool is_client_expired(struct nfs4_client *clp)
 134{
 135	return clp->cl_time == 0;
 136}
 137
 138static __be32 mark_client_expired_locked(struct nfs4_client *clp)
 
 139{
 140	if (atomic_read(&clp->cl_refcount))
 141		return nfserr_jukebox;
 142	clp->cl_time = 0;
 143	return nfs_ok;
 144}
 145
 146static __be32 mark_client_expired(struct nfs4_client *clp)
 147{
 148	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 149	__be32 ret;
 150
 151	spin_lock(&nn->client_lock);
 152	ret = mark_client_expired_locked(clp);
 153	spin_unlock(&nn->client_lock);
 154	return ret;
 155}
 156
 157static __be32 get_client_locked(struct nfs4_client *clp)
 158{
 159	if (is_client_expired(clp))
 160		return nfserr_expired;
 161	atomic_inc(&clp->cl_refcount);
 
 
 162	return nfs_ok;
 163}
 164
 165/* must be called under the client_lock */
 166static inline void
 167renew_client_locked(struct nfs4_client *clp)
 168{
 169	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 170
 171	if (is_client_expired(clp)) {
 172		WARN_ON(1);
 173		printk("%s: client (clientid %08x/%08x) already expired\n",
 174			__func__,
 175			clp->cl_clientid.cl_boot,
 176			clp->cl_clientid.cl_id);
 177		return;
 178	}
 179
 180	dprintk("renewing client (clientid %08x/%08x)\n",
 181			clp->cl_clientid.cl_boot,
 182			clp->cl_clientid.cl_id);
 183	list_move_tail(&clp->cl_lru, &nn->client_lru);
 184	clp->cl_time = get_seconds();
 
 
 185}
 186
 187static inline void
 188renew_client(struct nfs4_client *clp)
 189{
 190	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 191
 192	spin_lock(&nn->client_lock);
 193	renew_client_locked(clp);
 194	spin_unlock(&nn->client_lock);
 195}
 196
 197static void put_client_renew_locked(struct nfs4_client *clp)
 198{
 199	if (!atomic_dec_and_test(&clp->cl_refcount))
 200		return;
 201	if (!is_client_expired(clp))
 202		renew_client_locked(clp);
 
 
 203}
 204
 205void put_client_renew(struct nfs4_client *clp)
 206{
 207	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 208
 209	if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 210		return;
 211	if (!is_client_expired(clp))
 212		renew_client_locked(clp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 213	spin_unlock(&nn->client_lock);
 214}
 215
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 216
 217static inline u32
 218opaque_hashval(const void *ptr, int nbytes)
 219{
 220	unsigned char *cptr = (unsigned char *) ptr;
 221
 222	u32 x = 0;
 223	while (nbytes--) {
 224		x *= 37;
 225		x += *cptr++;
 226	}
 227	return x;
 228}
 229
 230static void nfsd4_free_file(struct nfs4_file *f)
 
 231{
 232	kmem_cache_free(file_slab, f);
 
 
 
 
 
 233}
 234
 235static inline void
 236put_nfs4_file(struct nfs4_file *fi)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 237{
 238	if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 239		hlist_del(&fi->fi_hash);
 240		spin_unlock(&recall_lock);
 241		iput(fi->fi_inode);
 242		nfsd4_free_file(fi);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 243	}
 
 
 244}
 245
 246static inline void
 247get_nfs4_file(struct nfs4_file *fi)
 248{
 249	atomic_inc(&fi->fi_ref);
 
 
 
 
 
 
 
 
 250}
 251
 252static int num_delegations;
 253unsigned long max_delegations;
 254
 255/*
 256 * Open owner state (share locks)
 257 */
 258
 259/* hash tables for lock and open owners */
 260#define OWNER_HASH_BITS              8
 261#define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 262#define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 263
 264static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 265{
 266	unsigned int ret;
 267
 268	ret = opaque_hashval(ownername->data, ownername->len);
 269	ret += clientid;
 270	return ret & OWNER_HASH_MASK;
 271}
 272
 273/* hash table for nfs4_file */
 274#define FILE_HASH_BITS                   8
 275#define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 
 
 
 
 
 
 
 
 
 
 
 276
 277static unsigned int file_hashval(struct inode *ino)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 278{
 279	/* XXX: why are we hashing on inode pointer, anyway? */
 280	return hash_ptr(ino, FILE_HASH_BITS);
 281}
 
 
 282
 283static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 284
 285static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 
 286{
 287	WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 288	atomic_inc(&fp->fi_access[oflag]);
 
 
 
 
 289}
 290
 291static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 
 292{
 293	if (oflag == O_RDWR) {
 294		__nfs4_file_get_access(fp, O_RDONLY);
 295		__nfs4_file_get_access(fp, O_WRONLY);
 296	} else
 297		__nfs4_file_get_access(fp, oflag);
 
 
 
 
 
 
 
 298}
 299
 300static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 301{
 302	if (fp->fi_fds[oflag]) {
 303		fput(fp->fi_fds[oflag]);
 304		fp->fi_fds[oflag] = NULL;
 
 
 
 
 
 
 
 
 
 
 305	}
 
 306}
 307
 308static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 309{
 310	if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 311		nfs4_file_put_fd(fp, oflag);
 
 
 
 
 
 312		if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 313			nfs4_file_put_fd(fp, O_RDWR);
 
 
 
 
 
 314	}
 315}
 316
 317static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 318{
 319	if (oflag == O_RDWR) {
 320		__nfs4_file_put_access(fp, O_RDONLY);
 
 321		__nfs4_file_put_access(fp, O_WRONLY);
 322	} else
 323		__nfs4_file_put_access(fp, oflag);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 324}
 325
 326static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
 327kmem_cache *slab)
 328{
 329	struct idr *stateids = &cl->cl_stateids;
 330	struct nfs4_stid *stid;
 331	int new_id;
 332
 333	stid = kmem_cache_alloc(slab, GFP_KERNEL);
 334	if (!stid)
 335		return NULL;
 336
 337	new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
 
 
 
 
 
 338	if (new_id < 0)
 339		goto out_free;
 
 
 340	stid->sc_client = cl;
 341	stid->sc_type = 0;
 342	stid->sc_stateid.si_opaque.so_id = new_id;
 343	stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 344	/* Will be incremented before return to client: */
 345	stid->sc_stateid.si_generation = 0;
 
 
 346
 347	/*
 348	 * It shouldn't be a problem to reuse an opaque stateid value.
 349	 * I don't think it is for 4.1.  But with 4.0 I worry that, for
 350	 * example, a stray write retransmission could be accepted by
 351	 * the server when it should have been rejected.  Therefore,
 352	 * adopt a trick from the sctp code to attempt to maximize the
 353	 * amount of time until an id is reused, by ensuring they always
 354	 * "increase" (mod INT_MAX):
 355	 */
 356	return stid;
 357out_free:
 358	kmem_cache_free(slab, stid);
 359	return NULL;
 360}
 361
 362static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 363{
 364	return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 365}
 366
 367static struct nfs4_delegation *
 368alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
 
 369{
 370	struct nfs4_delegation *dp;
 
 
 371
 372	dprintk("NFSD alloc_init_deleg\n");
 373	if (num_delegations > max_delegations)
 374		return NULL;
 375	dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 376	if (dp == NULL)
 377		return dp;
 378	dp->dl_stid.sc_type = NFS4_DELEG_STID;
 
 
 
 
 379	/*
 380	 * delegation seqid's are never incremented.  The 4.1 special
 381	 * meaning of seqid 0 isn't meaningful, really, but let's avoid
 382	 * 0 anyway just for consistency and use 1:
 383	 */
 384	dp->dl_stid.sc_stateid.si_generation = 1;
 385	num_delegations++;
 386	INIT_LIST_HEAD(&dp->dl_perfile);
 387	INIT_LIST_HEAD(&dp->dl_perclnt);
 388	INIT_LIST_HEAD(&dp->dl_recall_lru);
 389	dp->dl_file = NULL;
 390	dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 391	fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 392	dp->dl_time = 0;
 393	atomic_set(&dp->dl_count, 1);
 394	nfsd4_init_callback(&dp->dl_recall);
 
 
 
 
 
 
 395	return dp;
 
 
 
 396}
 397
 398static void remove_stid(struct nfs4_stid *s)
 
 399{
 400	struct idr *stateids = &s->sc_client->cl_stateids;
 
 
 
 401
 402	idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 
 
 
 
 
 
 
 
 
 
 
 403}
 404
 405static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
 
 406{
 407	kmem_cache_free(slab, s);
 
 
 
 
 
 
 408}
 409
 410void
 411nfs4_put_delegation(struct nfs4_delegation *dp)
 412{
 413	if (atomic_dec_and_test(&dp->dl_count)) {
 414		nfs4_free_stid(deleg_slab, &dp->dl_stid);
 415		num_delegations--;
 416	}
 
 
 
 
 
 417}
 418
 419static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 420{
 421	if (atomic_dec_and_test(&fp->fi_delegees)) {
 422		vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 423		fp->fi_lease = NULL;
 424		fput(fp->fi_deleg_file);
 425		fp->fi_deleg_file = NULL;
 426	}
 
 427}
 428
 429static void unhash_stid(struct nfs4_stid *s)
 430{
 431	s->sc_type = 0;
 
 
 432}
 433
 434/* Called under the state lock. */
 435static void
 436unhash_delegation(struct nfs4_delegation *dp)
 
 
 
 
 
 
 
 
 437{
 438	list_del_init(&dp->dl_perclnt);
 439	spin_lock(&recall_lock);
 440	list_del_init(&dp->dl_perfile);
 441	list_del_init(&dp->dl_recall_lru);
 442	spin_unlock(&recall_lock);
 443	nfs4_put_deleg_lease(dp->dl_file);
 444	put_nfs4_file(dp->dl_file);
 445	dp->dl_file = NULL;
 
 
 
 
 
 446}
 447
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 448
 
 
 
 
 449
 450static void destroy_revoked_delegation(struct nfs4_delegation *dp)
 
 451{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 452	list_del_init(&dp->dl_recall_lru);
 453	remove_stid(&dp->dl_stid);
 454	nfs4_put_delegation(dp);
 
 455}
 456
 457static void destroy_delegation(struct nfs4_delegation *dp)
 458{
 459	unhash_delegation(dp);
 460	remove_stid(&dp->dl_stid);
 461	nfs4_put_delegation(dp);
 
 
 
 
 462}
 463
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 464static void revoke_delegation(struct nfs4_delegation *dp)
 465{
 466	struct nfs4_client *clp = dp->dl_stid.sc_client;
 467
 468	if (clp->cl_minorversion == 0)
 469		destroy_delegation(dp);
 470	else {
 471		unhash_delegation(dp);
 472		dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
 473		list_add(&dp->dl_recall_lru, &clp->cl_revoked);
 
 
 
 
 474	}
 
 
 
 
 
 475}
 476
 477/* 
 478 * SETCLIENTID state 
 479 */
 480
 481static unsigned int clientid_hashval(u32 id)
 482{
 483	return id & CLIENT_HASH_MASK;
 484}
 485
 486static unsigned int clientstr_hashval(const char *name)
 487{
 488	return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 489}
 490
 491/*
 492 * We store the NONE, READ, WRITE, and BOTH bits separately in the
 493 * st_{access,deny}_bmap field of the stateid, in order to track not
 494 * only what share bits are currently in force, but also what
 495 * combinations of share bits previous opens have used.  This allows us
 496 * to enforce the recommendation of rfc 3530 14.2.19 that the server
 497 * return an error if the client attempt to downgrade to a combination
 498 * of share bits not explicable by closing some of its previous opens.
 499 *
 500 * XXX: This enforcement is actually incomplete, since we don't keep
 501 * track of access/deny bit combinations; so, e.g., we allow:
 502 *
 503 *	OPEN allow read, deny write
 504 *	OPEN allow both, deny none
 505 *	DOWNGRADE allow read, deny none
 506 *
 507 * which we should reject.
 508 */
 509static unsigned int
 510bmap_to_share_mode(unsigned long bmap) {
 511	int i;
 512	unsigned int access = 0;
 
 513
 514	for (i = 1; i < 4; i++) {
 515		if (test_bit(i, &bmap))
 516			access |= i;
 
 
 
 
 517	}
 518	return access;
 519}
 520
 521static bool
 522test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 523	unsigned int access, deny;
 
 
 524
 525	access = bmap_to_share_mode(stp->st_access_bmap);
 526	deny = bmap_to_share_mode(stp->st_deny_bmap);
 527	if ((access & open->op_share_deny) || (deny & open->op_share_access))
 528		return false;
 529	return true;
 
 
 
 
 
 530}
 531
 532/* set share access for a given stateid */
 533static inline void
 534set_access(u32 access, struct nfs4_ol_stateid *stp)
 535{
 536	__set_bit(access, &stp->st_access_bmap);
 
 
 
 
 
 
 
 
 
 
 537}
 538
 539/* clear share access for a given stateid */
 540static inline void
 541clear_access(u32 access, struct nfs4_ol_stateid *stp)
 542{
 543	__clear_bit(access, &stp->st_access_bmap);
 
 544}
 545
 546/* test whether a given stateid has access */
 547static inline bool
 548test_access(u32 access, struct nfs4_ol_stateid *stp)
 549{
 550	return test_bit(access, &stp->st_access_bmap);
 
 
 
 
 
 
 
 
 551}
 552
 553/* set share deny for a given stateid */
 554static inline void
 555set_deny(u32 access, struct nfs4_ol_stateid *stp)
 556{
 557	__set_bit(access, &stp->st_deny_bmap);
 558}
 559
 560/* clear share deny for a given stateid */
 561static inline void
 562clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 563{
 564	__clear_bit(access, &stp->st_deny_bmap);
 
 
 
 
 
 
 
 
 
 
 
 565}
 566
 567/* test whether a given stateid is denying specific access */
 568static inline bool
 569test_deny(u32 access, struct nfs4_ol_stateid *stp)
 570{
 571	return test_bit(access, &stp->st_deny_bmap);
 
 
 
 
 
 
 
 572}
 573
 574static int nfs4_access_to_omode(u32 access)
 575{
 576	switch (access & NFS4_SHARE_ACCESS_BOTH) {
 577	case NFS4_SHARE_ACCESS_READ:
 578		return O_RDONLY;
 579	case NFS4_SHARE_ACCESS_WRITE:
 580		return O_WRONLY;
 581	case NFS4_SHARE_ACCESS_BOTH:
 582		return O_RDWR;
 
 
 583	}
 584	WARN_ON_ONCE(1);
 585	return O_RDONLY;
 586}
 587
 588/* release all access and file references for a given stateid */
 589static void
 590release_all_access(struct nfs4_ol_stateid *stp)
 
 
 
 
 591{
 592	int i;
 
 593
 594	for (i = 1; i < 4; i++) {
 595		if (test_access(i, stp))
 596			nfs4_file_put_access(stp->st_file,
 597					     nfs4_access_to_omode(i));
 598		clear_access(i, stp);
 
 
 599	}
 
 
 
 
 
 600}
 601
 602static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 603{
 604	list_del(&stp->st_perfile);
 605	list_del(&stp->st_perstateowner);
 
 
 
 
 
 606}
 607
 608static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 609{
 610	release_all_access(stp);
 611	put_nfs4_file(stp->st_file);
 612	stp->st_file = NULL;
 
 
 
 
 
 613}
 614
 615static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 616{
 617	remove_stid(&stp->st_stid);
 618	nfs4_free_stid(stateid_slab, &stp->st_stid);
 
 
 
 619}
 620
 621static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 
 
 
 
 
 622{
 623	struct file *file;
 
 624
 625	unhash_generic_stateid(stp);
 626	unhash_stid(&stp->st_stid);
 627	file = find_any_file(stp->st_file);
 628	if (file)
 629		locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 630	close_generic_stateid(stp);
 631	free_generic_stateid(stp);
 
 
 
 
 632}
 633
 634static void unhash_lockowner(struct nfs4_lockowner *lo)
 
 635{
 636	struct nfs4_ol_stateid *stp;
 637
 638	list_del(&lo->lo_owner.so_strhash);
 639	list_del(&lo->lo_perstateid);
 640	list_del(&lo->lo_owner_ino_hash);
 641	while (!list_empty(&lo->lo_owner.so_stateids)) {
 642		stp = list_first_entry(&lo->lo_owner.so_stateids,
 643				struct nfs4_ol_stateid, st_perstateowner);
 644		release_lock_stateid(stp);
 645	}
 646}
 647
 648static void release_lockowner(struct nfs4_lockowner *lo)
 
 
 
 
 
 
 
 
 
 
 
 649{
 650	unhash_lockowner(lo);
 651	nfs4_free_lockowner(lo);
 
 
 
 
 
 
 652}
 653
 654static void
 655release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 656{
 657	struct nfs4_lockowner *lo;
 658
 659	while (!list_empty(&open_stp->st_lockowners)) {
 660		lo = list_entry(open_stp->st_lockowners.next,
 661				struct nfs4_lockowner, lo_perstateid);
 662		release_lockowner(lo);
 663	}
 664}
 665
 666static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 667{
 668	unhash_generic_stateid(stp);
 669	release_stateid_lockowners(stp);
 670	close_generic_stateid(stp);
 
 
 
 671}
 672
 673static void release_open_stateid(struct nfs4_ol_stateid *stp)
 674{
 675	unhash_open_stateid(stp);
 676	free_generic_stateid(stp);
 
 
 
 
 
 
 
 
 
 
 
 677}
 678
 679static void unhash_openowner(struct nfs4_openowner *oo)
 680{
 681	struct nfs4_ol_stateid *stp;
 
 
 682
 683	list_del(&oo->oo_owner.so_strhash);
 684	list_del(&oo->oo_perclient);
 685	while (!list_empty(&oo->oo_owner.so_stateids)) {
 686		stp = list_first_entry(&oo->oo_owner.so_stateids,
 687				struct nfs4_ol_stateid, st_perstateowner);
 688		release_open_stateid(stp);
 
 689	}
 
 
 
 
 690}
 691
 692static void release_last_closed_stateid(struct nfs4_openowner *oo)
 
 
 693{
 694	struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 
 695
 696	if (s) {
 697		free_generic_stateid(s);
 698		oo->oo_last_closed_stid = NULL;
 699	}
 
 
 
 
 
 
 700}
 701
 702static void release_openowner(struct nfs4_openowner *oo)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 703{
 704	unhash_openowner(oo);
 705	list_del(&oo->oo_close_lru);
 706	release_last_closed_stateid(oo);
 707	nfs4_free_openowner(oo);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 708}
 709
 710static inline int
 711hash_sessionid(struct nfs4_sessionid *sessionid)
 712{
 713	struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 714
 715	return sid->sequence % SESSION_HASH_SIZE;
 716}
 717
 718#ifdef NFSD_DEBUG
 719static inline void
 720dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 721{
 722	u32 *ptr = (u32 *)(&sessionid->data[0]);
 723	dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 724}
 725#else
 726static inline void
 727dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 728{
 729}
 730#endif
 731
 732/*
 733 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
 734 * won't be used for replay.
 735 */
 736void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
 737{
 738	struct nfs4_stateowner *so = cstate->replay_owner;
 739
 740	if (nfserr == nfserr_replay_me)
 741		return;
 742
 743	if (!seqid_mutating_err(ntohl(nfserr))) {
 744		cstate->replay_owner = NULL;
 745		return;
 746	}
 747	if (!so)
 748		return;
 749	if (so->so_is_open_owner)
 750		release_last_closed_stateid(openowner(so));
 751	so->so_seqid++;
 752	return;
 753}
 754
 755static void
 756gen_sessionid(struct nfsd4_session *ses)
 757{
 758	struct nfs4_client *clp = ses->se_client;
 759	struct nfsd4_sessionid *sid;
 760
 761	sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 762	sid->clientid = clp->cl_clientid;
 763	sid->sequence = current_sessionid++;
 764	sid->reserved = 0;
 765}
 766
 767/*
 768 * The protocol defines ca_maxresponssize_cached to include the size of
 769 * the rpc header, but all we need to cache is the data starting after
 770 * the end of the initial SEQUENCE operation--the rest we regenerate
 771 * each time.  Therefore we can advertise a ca_maxresponssize_cached
 772 * value that is the number of bytes in our cache plus a few additional
 773 * bytes.  In order to stay on the safe side, and not promise more than
 774 * we can cache, those additional bytes must be the minimum possible: 24
 775 * bytes of rpc header (xid through accept state, with AUTH_NULL
 776 * verifier), 12 for the compound header (with zero-length tag), and 44
 777 * for the SEQUENCE op response:
 778 */
 779#define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 780
 781static void
 782free_session_slots(struct nfsd4_session *ses)
 783{
 784	int i;
 785
 786	for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 
 787		kfree(ses->se_slots[i]);
 
 788}
 789
 790/*
 791 * We don't actually need to cache the rpc and session headers, so we
 792 * can allocate a little less for each slot:
 793 */
 794static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
 795{
 796	u32 size;
 797
 798	if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
 799		size = 0;
 800	else
 801		size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 802	return size + sizeof(struct nfsd4_slot);
 803}
 804
 805/*
 806 * XXX: If we run out of reserved DRC memory we could (up to a point)
 807 * re-negotiate active sessions and reduce their slot usage to make
 808 * room for new connections. For now we just fail the create session.
 809 */
 810static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
 811{
 812	u32 slotsize = slot_bytes(ca);
 813	u32 num = ca->maxreqs;
 814	int avail;
 
 815
 816	spin_lock(&nfsd_drc_lock);
 817	avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
 818		    nfsd_drc_max_mem - nfsd_drc_mem_used);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 819	num = min_t(int, num, avail / slotsize);
 
 820	nfsd_drc_mem_used += num * slotsize;
 821	spin_unlock(&nfsd_drc_lock);
 822
 823	return num;
 824}
 825
 826static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
 827{
 828	int slotsize = slot_bytes(ca);
 829
 830	spin_lock(&nfsd_drc_lock);
 831	nfsd_drc_mem_used -= slotsize * ca->maxreqs;
 832	spin_unlock(&nfsd_drc_lock);
 833}
 834
 835static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
 836					   struct nfsd4_channel_attrs *battrs)
 837{
 838	int numslots = fattrs->maxreqs;
 839	int slotsize = slot_bytes(fattrs);
 840	struct nfsd4_session *new;
 841	int mem, i;
 842
 843	BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 844			+ sizeof(struct nfsd4_session) > PAGE_SIZE);
 845	mem = numslots * sizeof(struct nfsd4_slot *);
 846
 847	new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 848	if (!new)
 849		return NULL;
 850	/* allocate each struct nfsd4_slot and data cache in one piece */
 851	for (i = 0; i < numslots; i++) {
 852		new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
 853		if (!new->se_slots[i])
 854			goto out_free;
 855	}
 856
 857	memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
 858	memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
 859
 
 
 860	return new;
 861out_free:
 862	while (i--)
 863		kfree(new->se_slots[i]);
 864	kfree(new);
 865	return NULL;
 866}
 867
 868static void free_conn(struct nfsd4_conn *c)
 869{
 870	svc_xprt_put(c->cn_xprt);
 871	kfree(c);
 872}
 873
 874static void nfsd4_conn_lost(struct svc_xpt_user *u)
 875{
 876	struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 877	struct nfs4_client *clp = c->cn_session->se_client;
 878
 
 
 879	spin_lock(&clp->cl_lock);
 880	if (!list_empty(&c->cn_persession)) {
 881		list_del(&c->cn_persession);
 882		free_conn(c);
 883	}
 884	nfsd4_probe_callback(clp);
 885	spin_unlock(&clp->cl_lock);
 886}
 887
 888static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 889{
 890	struct nfsd4_conn *conn;
 891
 892	conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 893	if (!conn)
 894		return NULL;
 895	svc_xprt_get(rqstp->rq_xprt);
 896	conn->cn_xprt = rqstp->rq_xprt;
 897	conn->cn_flags = flags;
 898	INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 899	return conn;
 900}
 901
 902static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 903{
 904	conn->cn_session = ses;
 905	list_add(&conn->cn_persession, &ses->se_conns);
 906}
 907
 908static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 909{
 910	struct nfs4_client *clp = ses->se_client;
 911
 912	spin_lock(&clp->cl_lock);
 913	__nfsd4_hash_conn(conn, ses);
 914	spin_unlock(&clp->cl_lock);
 915}
 916
 917static int nfsd4_register_conn(struct nfsd4_conn *conn)
 918{
 919	conn->cn_xpt_user.callback = nfsd4_conn_lost;
 920	return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 921}
 922
 923static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
 924{
 925	int ret;
 926
 927	nfsd4_hash_conn(conn, ses);
 928	ret = nfsd4_register_conn(conn);
 929	if (ret)
 930		/* oops; xprt is already down: */
 931		nfsd4_conn_lost(&conn->cn_xpt_user);
 932	if (conn->cn_flags & NFS4_CDFC4_BACK) {
 933		/* callback channel may be back up */
 934		nfsd4_probe_callback(ses->se_client);
 935	}
 936}
 937
 938static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
 939{
 940	u32 dir = NFS4_CDFC4_FORE;
 941
 942	if (cses->flags & SESSION4_BACK_CHAN)
 943		dir |= NFS4_CDFC4_BACK;
 944	return alloc_conn(rqstp, dir);
 945}
 946
 947/* must be called under client_lock */
 948static void nfsd4_del_conns(struct nfsd4_session *s)
 949{
 950	struct nfs4_client *clp = s->se_client;
 951	struct nfsd4_conn *c;
 952
 953	spin_lock(&clp->cl_lock);
 954	while (!list_empty(&s->se_conns)) {
 955		c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 956		list_del_init(&c->cn_persession);
 957		spin_unlock(&clp->cl_lock);
 958
 959		unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 960		free_conn(c);
 961
 962		spin_lock(&clp->cl_lock);
 963	}
 964	spin_unlock(&clp->cl_lock);
 965}
 966
 967static void __free_session(struct nfsd4_session *ses)
 968{
 969	free_session_slots(ses);
 970	kfree(ses);
 971}
 972
 973static void free_session(struct nfsd4_session *ses)
 974{
 975	struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
 976
 977	lockdep_assert_held(&nn->client_lock);
 978	nfsd4_del_conns(ses);
 979	nfsd4_put_drc_mem(&ses->se_fchannel);
 980	__free_session(ses);
 981}
 982
 983static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 984{
 985	int idx;
 986	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 987
 988	new->se_client = clp;
 989	gen_sessionid(new);
 990
 991	INIT_LIST_HEAD(&new->se_conns);
 992
 993	new->se_cb_seq_nr = 1;
 994	new->se_flags = cses->flags;
 995	new->se_cb_prog = cses->callback_prog;
 996	new->se_cb_sec = cses->cb_sec;
 997	atomic_set(&new->se_ref, 0);
 
 
 
 998	idx = hash_sessionid(&new->se_sessionid);
 999	spin_lock(&nn->client_lock);
1000	list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1001	spin_lock(&clp->cl_lock);
1002	list_add(&new->se_perclnt, &clp->cl_sessions);
1003	spin_unlock(&clp->cl_lock);
1004	spin_unlock(&nn->client_lock);
1005
1006	if (cses->flags & SESSION4_BACK_CHAN) {
1007		struct sockaddr *sa = svc_addr(rqstp);
1008		/*
1009		 * This is a little silly; with sessions there's no real
1010		 * use for the callback address.  Use the peer address
1011		 * as a reasonable default for now, but consider fixing
1012		 * the rpc client not to require an address in the
1013		 * future:
1014		 */
1015		rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1016		clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1017	}
1018}
1019
1020/* caller must hold client_lock */
1021static struct nfsd4_session *
1022find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1023{
1024	struct nfsd4_session *elem;
1025	int idx;
1026	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1027
 
 
1028	dump_sessionid(__func__, sessionid);
1029	idx = hash_sessionid(sessionid);
1030	/* Search in the appropriate list */
1031	list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1032		if (!memcmp(elem->se_sessionid.data, sessionid->data,
1033			    NFS4_MAX_SESSIONID_LEN)) {
1034			return elem;
1035		}
1036	}
1037
1038	dprintk("%s: session not found\n", __func__);
1039	return NULL;
1040}
1041
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1042/* caller must hold client_lock */
1043static void
1044unhash_session(struct nfsd4_session *ses)
1045{
 
 
 
 
 
1046	list_del(&ses->se_hash);
1047	spin_lock(&ses->se_client->cl_lock);
1048	list_del(&ses->se_perclnt);
1049	spin_unlock(&ses->se_client->cl_lock);
1050}
1051
1052/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1053static int
1054STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1055{
1056	if (clid->cl_boot == nn->boot_time)
 
 
 
 
 
1057		return 0;
1058	dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1059		clid->cl_boot, clid->cl_id, nn->boot_time);
1060	return 1;
1061}
1062
1063/* 
1064 * XXX Should we use a slab cache ?
1065 * This type of memory management is somewhat inefficient, but we use it
1066 * anyway since SETCLIENTID is not a common operation.
1067 */
1068static struct nfs4_client *alloc_client(struct xdr_netobj name)
1069{
1070	struct nfs4_client *clp;
 
1071
1072	clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
 
 
 
 
1073	if (clp == NULL)
1074		return NULL;
1075	clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1076	if (clp->cl_name.data == NULL) {
1077		kfree(clp);
1078		return NULL;
1079	}
1080	clp->cl_name.len = name.len;
 
 
 
 
 
 
 
 
1081	INIT_LIST_HEAD(&clp->cl_sessions);
1082	idr_init(&clp->cl_stateids);
1083	atomic_set(&clp->cl_refcount, 0);
1084	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
 
 
 
1085	INIT_LIST_HEAD(&clp->cl_idhash);
1086	INIT_LIST_HEAD(&clp->cl_openowners);
1087	INIT_LIST_HEAD(&clp->cl_delegations);
1088	INIT_LIST_HEAD(&clp->cl_lru);
1089	INIT_LIST_HEAD(&clp->cl_callbacks);
1090	INIT_LIST_HEAD(&clp->cl_revoked);
 
 
 
 
 
1091	spin_lock_init(&clp->cl_lock);
1092	rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1093	return clp;
 
 
 
 
 
 
 
1094}
1095
1096static inline void
1097free_client(struct nfs4_client *clp)
1098{
1099	struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
 
1100
1101	lockdep_assert_held(&nn->client_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1102	while (!list_empty(&clp->cl_sessions)) {
1103		struct nfsd4_session *ses;
1104		ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1105				se_perclnt);
1106		list_del(&ses->se_perclnt);
1107		WARN_ON_ONCE(atomic_read(&ses->se_ref));
1108		free_session(ses);
1109	}
1110	rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1111	free_svc_cred(&clp->cl_cred);
1112	kfree(clp->cl_name.data);
1113	idr_destroy(&clp->cl_stateids);
1114	kfree(clp);
 
 
1115}
1116
1117/* must be called under the client_lock */
1118static inline void
1119unhash_client_locked(struct nfs4_client *clp)
1120{
 
1121	struct nfsd4_session *ses;
1122
1123	list_del(&clp->cl_lru);
 
 
 
 
 
 
 
 
 
 
 
 
1124	spin_lock(&clp->cl_lock);
1125	list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1126		list_del_init(&ses->se_hash);
1127	spin_unlock(&clp->cl_lock);
1128}
1129
1130static void
1131destroy_client(struct nfs4_client *clp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1132{
 
 
1133	struct nfs4_openowner *oo;
1134	struct nfs4_delegation *dp;
1135	struct list_head reaplist;
1136	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1137
1138	INIT_LIST_HEAD(&reaplist);
1139	spin_lock(&recall_lock);
1140	while (!list_empty(&clp->cl_delegations)) {
1141		dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1142		list_del_init(&dp->dl_perclnt);
1143		list_move(&dp->dl_recall_lru, &reaplist);
1144	}
1145	spin_unlock(&recall_lock);
1146	while (!list_empty(&reaplist)) {
1147		dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1148		destroy_delegation(dp);
 
1149	}
1150	list_splice_init(&clp->cl_revoked, &reaplist);
1151	while (!list_empty(&reaplist)) {
1152		dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1153		destroy_revoked_delegation(dp);
1154	}
1155	while (!list_empty(&clp->cl_openowners)) {
1156		oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
 
1157		release_openowner(oo);
1158	}
 
 
 
 
 
 
 
 
 
 
 
 
1159	nfsd4_shutdown_callback(clp);
1160	if (clp->cl_cb_conn.cb_xprt)
1161		svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1162	list_del(&clp->cl_idhash);
1163	if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1164		rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1165	else
1166		rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1167	spin_lock(&nn->client_lock);
1168	unhash_client_locked(clp);
1169	WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1170	free_client(clp);
1171	spin_unlock(&nn->client_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1172}
1173
1174static void expire_client(struct nfs4_client *clp)
1175{
 
1176	nfsd4_client_record_remove(clp);
1177	destroy_client(clp);
1178}
1179
1180static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1181{
1182	memcpy(target->cl_verifier.data, source->data,
1183			sizeof(target->cl_verifier.data));
1184}
1185
1186static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1187{
1188	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1189	target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1190}
1191
1192static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1193{
1194	if (source->cr_principal) {
1195		target->cr_principal =
1196				kstrdup(source->cr_principal, GFP_KERNEL);
1197		if (target->cr_principal == NULL)
1198			return -ENOMEM;
1199	} else
1200		target->cr_principal = NULL;
 
 
1201	target->cr_flavor = source->cr_flavor;
1202	target->cr_uid = source->cr_uid;
1203	target->cr_gid = source->cr_gid;
1204	target->cr_group_info = source->cr_group_info;
1205	get_group_info(target->cr_group_info);
1206	target->cr_gss_mech = source->cr_gss_mech;
1207	if (source->cr_gss_mech)
1208		gss_mech_get(source->cr_gss_mech);
1209	return 0;
1210}
1211
1212static long long
1213compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1214{
1215	long long res;
1216
1217	res = o1->len - o2->len;
1218	if (res)
1219		return res;
1220	return (long long)memcmp(o1->data, o2->data, o1->len);
1221}
1222
1223static int same_name(const char *n1, const char *n2)
1224{
1225	return 0 == memcmp(n1, n2, HEXDIR_LEN);
1226}
1227
1228static int
1229same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1230{
1231	return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1232}
1233
1234static int
1235same_clid(clientid_t *cl1, clientid_t *cl2)
1236{
1237	return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1238}
1239
1240static bool groups_equal(struct group_info *g1, struct group_info *g2)
1241{
1242	int i;
1243
1244	if (g1->ngroups != g2->ngroups)
1245		return false;
1246	for (i=0; i<g1->ngroups; i++)
1247		if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1248			return false;
1249	return true;
1250}
1251
1252/*
1253 * RFC 3530 language requires clid_inuse be returned when the
1254 * "principal" associated with a requests differs from that previously
1255 * used.  We use uid, gid's, and gss principal string as our best
1256 * approximation.  We also don't want to allow non-gss use of a client
1257 * established using gss: in theory cr_principal should catch that
1258 * change, but in practice cr_principal can be null even in the gss case
1259 * since gssd doesn't always pass down a principal string.
1260 */
1261static bool is_gss_cred(struct svc_cred *cr)
1262{
1263	/* Is cr_flavor one of the gss "pseudoflavors"?: */
1264	return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1265}
1266
1267
1268static bool
1269same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1270{
1271	if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1272		|| (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1273		|| (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1274		|| !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1275		return false;
 
1276	if (cr1->cr_principal == cr2->cr_principal)
1277		return true;
1278	if (!cr1->cr_principal || !cr2->cr_principal)
1279		return false;
1280	return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1281}
1282
1283static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1284{
1285	struct svc_cred *cr = &rqstp->rq_cred;
1286	u32 service;
1287
1288	if (!cr->cr_gss_mech)
1289		return false;
1290	service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1291	return service == RPC_GSS_SVC_INTEGRITY ||
1292	       service == RPC_GSS_SVC_PRIVACY;
1293}
1294
1295static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1296{
1297	struct svc_cred *cr = &rqstp->rq_cred;
1298
1299	if (!cl->cl_mach_cred)
1300		return true;
1301	if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1302		return false;
1303	if (!svc_rqst_integrity_protected(rqstp))
1304		return false;
 
 
 
1305	if (!cr->cr_principal)
1306		return false;
1307	return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1308}
1309
1310static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1311{
1312	static u32 current_clientid = 1;
1313
1314	clp->cl_clientid.cl_boot = nn->boot_time;
1315	clp->cl_clientid.cl_id = current_clientid++; 
 
 
 
 
 
1316}
1317
1318static void gen_confirm(struct nfs4_client *clp)
1319{
1320	__be32 verf[2];
1321	static u32 i;
1322
1323	verf[0] = (__be32)get_seconds();
1324	verf[1] = (__be32)i++;
1325	memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1326}
1327
1328static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
 
1329{
1330	struct nfs4_stid *ret;
1331
1332	ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1333	if (!ret || !ret->sc_type)
1334		return NULL;
1335	return ret;
1336}
1337
1338static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
 
 
1339{
1340	struct nfs4_stid *s;
1341
1342	s = find_stateid(cl, t);
1343	if (!s)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1344		return NULL;
1345	if (typemask & s->sc_type)
1346		return s;
1347	return NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1348}
1349
1350static struct nfs4_client *create_client(struct xdr_netobj name,
1351		struct svc_rqst *rqstp, nfs4_verifier *verf)
1352{
1353	struct nfs4_client *clp;
1354	struct sockaddr *sa = svc_addr(rqstp);
1355	int ret;
1356	struct net *net = SVC_NET(rqstp);
1357	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
1358
1359	clp = alloc_client(name);
1360	if (clp == NULL)
1361		return NULL;
1362
1363	ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1364	if (ret) {
1365		spin_lock(&nn->client_lock);
1366		free_client(clp);
1367		spin_unlock(&nn->client_lock);
1368		return NULL;
1369	}
1370	nfsd4_init_callback(&clp->cl_cb_null);
1371	clp->cl_time = get_seconds();
1372	clear_bit(0, &clp->cl_cb_slot_busy);
 
1373	copy_verf(clp, verf);
1374	rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1375	gen_confirm(clp);
1376	clp->cl_cb_session = NULL;
1377	clp->net = net;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1378	return clp;
1379}
1380
1381static void
1382add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1383{
1384	struct rb_node **new = &(root->rb_node), *parent = NULL;
1385	struct nfs4_client *clp;
1386
1387	while (*new) {
1388		clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1389		parent = *new;
1390
1391		if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1392			new = &((*new)->rb_left);
1393		else
1394			new = &((*new)->rb_right);
1395	}
1396
1397	rb_link_node(&new_clp->cl_namenode, parent, new);
1398	rb_insert_color(&new_clp->cl_namenode, root);
1399}
1400
1401static struct nfs4_client *
1402find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1403{
1404	long long cmp;
1405	struct rb_node *node = root->rb_node;
1406	struct nfs4_client *clp;
1407
1408	while (node) {
1409		clp = rb_entry(node, struct nfs4_client, cl_namenode);
1410		cmp = compare_blob(&clp->cl_name, name);
1411		if (cmp > 0)
1412			node = node->rb_left;
1413		else if (cmp < 0)
1414			node = node->rb_right;
1415		else
1416			return clp;
1417	}
1418	return NULL;
1419}
1420
1421static void
1422add_to_unconfirmed(struct nfs4_client *clp)
1423{
1424	unsigned int idhashval;
1425	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1426
 
 
1427	clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1428	add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1429	idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1430	list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1431	renew_client(clp);
1432}
1433
1434static void
1435move_to_confirmed(struct nfs4_client *clp)
1436{
1437	unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1438	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1439
1440	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 
1441	list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1442	rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1443	add_clp_to_name_tree(clp, &nn->conf_name_tree);
1444	set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1445	renew_client(clp);
 
1446}
1447
1448static struct nfs4_client *
1449find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1450{
1451	struct nfs4_client *clp;
1452	unsigned int idhashval = clientid_hashval(clid->cl_id);
1453
1454	list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1455		if (same_clid(&clp->cl_clientid, clid)) {
1456			if ((bool)clp->cl_minorversion != sessions)
1457				return NULL;
1458			renew_client(clp);
1459			return clp;
1460		}
1461	}
1462	return NULL;
1463}
1464
1465static struct nfs4_client *
1466find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1467{
1468	struct list_head *tbl = nn->conf_id_hashtbl;
1469
 
1470	return find_client_in_id_table(tbl, clid, sessions);
1471}
1472
1473static struct nfs4_client *
1474find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1475{
1476	struct list_head *tbl = nn->unconf_id_hashtbl;
1477
 
1478	return find_client_in_id_table(tbl, clid, sessions);
1479}
1480
1481static bool clp_used_exchangeid(struct nfs4_client *clp)
1482{
1483	return clp->cl_exchange_flags != 0;
1484} 
1485
1486static struct nfs4_client *
1487find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1488{
 
1489	return find_clp_in_name_tree(name, &nn->conf_name_tree);
1490}
1491
1492static struct nfs4_client *
1493find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1494{
 
1495	return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1496}
1497
1498static void
1499gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1500{
1501	struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1502	struct sockaddr	*sa = svc_addr(rqstp);
1503	u32 scopeid = rpc_get_scope_id(sa);
1504	unsigned short expected_family;
1505
1506	/* Currently, we only support tcp and tcp6 for the callback channel */
1507	if (se->se_callback_netid_len == 3 &&
1508	    !memcmp(se->se_callback_netid_val, "tcp", 3))
1509		expected_family = AF_INET;
1510	else if (se->se_callback_netid_len == 4 &&
1511		 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1512		expected_family = AF_INET6;
1513	else
1514		goto out_err;
1515
1516	conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1517					    se->se_callback_addr_len,
1518					    (struct sockaddr *)&conn->cb_addr,
1519					    sizeof(conn->cb_addr));
1520
1521	if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1522		goto out_err;
1523
1524	if (conn->cb_addr.ss_family == AF_INET6)
1525		((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1526
1527	conn->cb_prog = se->se_callback_prog;
1528	conn->cb_ident = se->se_callback_ident;
1529	memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
 
1530	return;
1531out_err:
1532	conn->cb_addr.ss_family = AF_UNSPEC;
1533	conn->cb_addrlen = 0;
1534	dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1535		"will not receive delegations\n",
1536		clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1537
1538	return;
1539}
1540
1541/*
1542 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1543 */
1544void
1545nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1546{
 
1547	struct nfsd4_slot *slot = resp->cstate.slot;
1548	unsigned int base;
1549
1550	dprintk("--> %s slot %p\n", __func__, slot);
1551
 
1552	slot->sl_opcnt = resp->opcnt;
1553	slot->sl_status = resp->cstate.status;
 
 
1554
1555	slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1556	if (nfsd4_not_cached(resp)) {
1557		slot->sl_datalen = 0;
1558		return;
1559	}
1560	slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1561	base = (char *)resp->cstate.datap -
1562					(char *)resp->xbuf->head[0].iov_base;
1563	if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1564				    slot->sl_datalen))
1565		WARN("%s: sessions DRC could not cache compound\n", __func__);
 
1566	return;
1567}
1568
1569/*
1570 * Encode the replay sequence operation from the slot values.
1571 * If cachethis is FALSE encode the uncached rep error on the next
1572 * operation which sets resp->p and increments resp->opcnt for
1573 * nfs4svc_encode_compoundres.
1574 *
1575 */
1576static __be32
1577nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1578			  struct nfsd4_compoundres *resp)
1579{
1580	struct nfsd4_op *op;
1581	struct nfsd4_slot *slot = resp->cstate.slot;
1582
1583	/* Encode the replayed sequence operation */
1584	op = &args->ops[resp->opcnt - 1];
1585	nfsd4_encode_operation(resp, op);
1586
1587	/* Return nfserr_retry_uncached_rep in next operation. */
1588	if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
 
 
 
 
 
 
 
 
1589		op = &args->ops[resp->opcnt++];
1590		op->status = nfserr_retry_uncached_rep;
1591		nfsd4_encode_operation(resp, op);
1592	}
1593	return op->status;
1594}
1595
1596/*
1597 * The sequence operation is not cached because we can use the slot and
1598 * session values.
1599 */
1600static __be32
1601nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1602			 struct nfsd4_sequence *seq)
1603{
1604	struct nfsd4_slot *slot = resp->cstate.slot;
 
 
1605	__be32 status;
1606
1607	dprintk("--> %s slot %p\n", __func__, slot);
1608
1609	status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1610	if (status)
1611		return status;
1612
1613	/* The sequence operation has been encoded, cstate->datap set. */
1614	memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
 
 
 
 
 
1615
1616	resp->opcnt = slot->sl_opcnt;
1617	resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1618	status = slot->sl_status;
1619
1620	return status;
1621}
1622
1623/*
1624 * Set the exchange_id flags returned by the server.
1625 */
1626static void
1627nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1628{
1629	/* pNFS is not supported */
 
 
1630	new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
 
1631
1632	/* Referrals are supported, Migration is not. */
1633	new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1634
1635	/* set the wire flags to return to client. */
1636	clid->flags = new->cl_exchange_flags;
1637}
1638
 
 
 
 
 
 
 
 
 
 
 
1639static bool client_has_state(struct nfs4_client *clp)
1640{
1641	/*
1642	 * Note clp->cl_openowners check isn't quite right: there's no
1643	 * need to count owners without stateid's.
1644	 *
1645	 * Also note we should probably be using this in 4.0 case too.
1646	 */
1647	return !list_empty(&clp->cl_openowners)
1648		|| !list_empty(&clp->cl_delegations)
1649		|| !list_empty(&clp->cl_sessions);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1650}
1651
1652__be32
1653nfsd4_exchange_id(struct svc_rqst *rqstp,
1654		  struct nfsd4_compound_state *cstate,
1655		  struct nfsd4_exchange_id *exid)
1656{
1657	struct nfs4_client *unconf, *conf, *new;
 
 
1658	__be32 status;
1659	char			addr_str[INET6_ADDRSTRLEN];
1660	nfs4_verifier		verf = exid->verifier;
1661	struct sockaddr		*sa = svc_addr(rqstp);
1662	bool	update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1663	struct nfsd_net		*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1664
1665	rpc_ntop(sa, addr_str, sizeof(addr_str));
1666	dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1667		"ip_addr=%s flags %x, spa_how %d\n",
1668		__func__, rqstp, exid, exid->clname.len, exid->clname.data,
1669		addr_str, exid->flags, exid->spa_how);
1670
 
 
 
 
 
 
1671	if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1672		return nfserr_inval;
1673
 
 
 
 
 
 
 
1674	switch (exid->spa_how) {
1675	case SP4_MACH_CRED:
1676		if (!svc_rqst_integrity_protected(rqstp))
1677			return nfserr_inval;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1678	case SP4_NONE:
1679		break;
1680	default:				/* checked by xdr code */
1681		WARN_ON_ONCE(1);
 
1682	case SP4_SSV:
1683		return nfserr_encr_alg_unsupp;
 
1684	}
1685
1686	/* Cases below refer to rfc 5661 section 18.35.4: */
1687	nfs4_lock_state();
1688	conf = find_confirmed_client_by_name(&exid->clname, nn);
1689	if (conf) {
1690		bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1691		bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1692
1693		if (update) {
1694			if (!clp_used_exchangeid(conf)) { /* buggy client */
1695				status = nfserr_inval;
1696				goto out;
1697			}
1698			if (!mach_creds_match(conf, rqstp)) {
1699				status = nfserr_wrong_cred;
1700				goto out;
1701			}
1702			if (!creds_match) { /* case 9 */
1703				status = nfserr_perm;
1704				goto out;
1705			}
1706			if (!verfs_match) { /* case 8 */
1707				status = nfserr_not_same;
1708				goto out;
1709			}
1710			/* case 6 */
1711			exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1712			new = conf;
1713			goto out_copy;
1714		}
1715		if (!creds_match) { /* case 3 */
1716			if (client_has_state(conf)) {
1717				status = nfserr_clid_inuse;
 
1718				goto out;
1719			}
1720			expire_client(conf);
1721			goto out_new;
1722		}
1723		if (verfs_match) { /* case 2 */
1724			conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1725			new = conf;
1726			goto out_copy;
1727		}
1728		/* case 5, client reboot */
 
 
1729		goto out_new;
1730	}
1731
1732	if (update) { /* case 7 */
1733		status = nfserr_noent;
1734		goto out;
1735	}
1736
1737	unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1738	if (unconf) /* case 4, possible retry or client restart */
1739		expire_client(unconf);
 
 
 
1740
1741	/* case 1 (normal case) */
1742out_new:
1743	new = create_client(exid->clname, rqstp, &verf);
1744	if (new == NULL) {
1745		status = nfserr_jukebox;
1746		goto out;
 
1747	}
1748	new->cl_minorversion = cstate->minorversion;
1749	new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
 
 
 
 
1750
1751	gen_clid(new, nn);
1752	add_to_unconfirmed(new);
 
1753out_copy:
1754	exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1755	exid->clientid.cl_id = new->cl_clientid.cl_id;
 
 
 
1756
1757	exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1758	nfsd4_set_ex_flags(new, exid);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1759
1760	dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1761		new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1762	status = nfs_ok;
1763
1764out:
1765	nfs4_unlock_state();
 
 
 
 
 
 
 
1766	return status;
1767}
1768
1769static __be32
1770check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1771{
1772	dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1773		slot_seqid);
1774
 
 
 
 
 
1775	/* The slot is in use, and no response has been sent. */
1776	if (slot_inuse) {
1777		if (seqid == slot_seqid)
1778			return nfserr_jukebox;
1779		else
1780			return nfserr_seq_misordered;
1781	}
1782	/* Note unsigned 32-bit arithmetic handles wraparound: */
1783	if (likely(seqid == slot_seqid + 1))
1784		return nfs_ok;
1785	if (seqid == slot_seqid)
1786		return nfserr_replay_cache;
1787	return nfserr_seq_misordered;
1788}
1789
1790/*
1791 * Cache the create session result into the create session single DRC
1792 * slot cache by saving the xdr structure. sl_seqid has been set.
1793 * Do this for solo or embedded create session operations.
1794 */
1795static void
1796nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1797			   struct nfsd4_clid_slot *slot, __be32 nfserr)
1798{
1799	slot->sl_status = nfserr;
1800	memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1801}
1802
1803static __be32
1804nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1805			    struct nfsd4_clid_slot *slot)
1806{
1807	memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1808	return slot->sl_status;
1809}
1810
1811#define NFSD_MIN_REQ_HDR_SEQ_SZ	((\
1812			2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1813			1 +	/* MIN tag is length with zero, only length */ \
1814			3 +	/* version, opcount, opcode */ \
1815			XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1816				/* seqid, slotID, slotID, cache */ \
1817			4 ) * sizeof(__be32))
1818
1819#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1820			2 +	/* verifier: AUTH_NULL, length 0 */\
1821			1 +	/* status */ \
1822			1 +	/* MIN tag is length with zero, only length */ \
1823			3 +	/* opcount, opcode, opstatus*/ \
1824			XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1825				/* seqid, slotID, slotID, slotID, status */ \
1826			5 ) * sizeof(__be32))
1827
1828static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1829{
1830	u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1831
1832	if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1833		return nfserr_toosmall;
1834	if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1835		return nfserr_toosmall;
1836	ca->headerpadsz = 0;
1837	ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1838	ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1839	ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1840	ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1841			NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1842	ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1843	/*
1844	 * Note decreasing slot size below client's request may make it
1845	 * difficult for client to function correctly, whereas
1846	 * decreasing the number of slots will (just?) affect
1847	 * performance.  When short on memory we therefore prefer to
1848	 * decrease number of slots instead of their size.  Clients that
1849	 * request larger slots than they need will get poor results:
 
 
1850	 */
1851	ca->maxreqs = nfsd4_get_drc_mem(ca);
1852	if (!ca->maxreqs)
1853		return nfserr_jukebox;
1854
1855	return nfs_ok;
1856}
1857
 
 
 
 
 
 
 
 
 
 
1858#define NFSD_CB_MAX_REQ_SZ	((NFS4_enc_cb_recall_sz + \
1859				 RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1860#define NFSD_CB_MAX_RESP_SZ	((NFS4_dec_cb_recall_sz + \
1861				 RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
 
1862
1863static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1864{
1865	ca->headerpadsz = 0;
1866
1867	/*
1868	 * These RPC_MAX_HEADER macros are overkill, especially since we
1869	 * don't even do gss on the backchannel yet.  But this is still
1870	 * less than 1k.  Tighten up this estimate in the unlikely event
1871	 * it turns out to be a problem for some client:
1872	 */
1873	if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1874		return nfserr_toosmall;
1875	if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1876		return nfserr_toosmall;
1877	ca->maxresp_cached = 0;
1878	if (ca->maxops < 2)
1879		return nfserr_toosmall;
1880
1881	return nfs_ok;
1882}
1883
1884static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1885{
1886	switch (cbs->flavor) {
1887	case RPC_AUTH_NULL:
1888	case RPC_AUTH_UNIX:
1889		return nfs_ok;
1890	default:
1891		/*
1892		 * GSS case: the spec doesn't allow us to return this
1893		 * error.  But it also doesn't allow us not to support
1894		 * GSS.
1895		 * I'd rather this fail hard than return some error the
1896		 * client might think it can already handle:
1897		 */
1898		return nfserr_encr_alg_unsupp;
1899	}
1900}
1901
1902__be32
1903nfsd4_create_session(struct svc_rqst *rqstp,
1904		     struct nfsd4_compound_state *cstate,
1905		     struct nfsd4_create_session *cr_ses)
1906{
 
1907	struct sockaddr *sa = svc_addr(rqstp);
1908	struct nfs4_client *conf, *unconf;
 
 
1909	struct nfsd4_session *new;
1910	struct nfsd4_conn *conn;
1911	struct nfsd4_clid_slot *cs_slot = NULL;
1912	__be32 status = 0;
1913	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1914
1915	if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1916		return nfserr_inval;
1917	status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1918	if (status)
1919		return status;
1920	status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1921	if (status)
1922		return status;
1923	status = check_backchannel_attrs(&cr_ses->back_channel);
1924	if (status)
1925		goto out_release_drc_mem;
1926	status = nfserr_jukebox;
1927	new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1928	if (!new)
1929		goto out_release_drc_mem;
1930	conn = alloc_conn_from_crses(rqstp, cr_ses);
1931	if (!conn)
1932		goto out_free_session;
1933
1934	nfs4_lock_state();
 
 
1935	unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1936	conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1937	WARN_ON_ONCE(conf && unconf);
 
 
 
1938
 
1939	if (conf) {
1940		status = nfserr_wrong_cred;
1941		if (!mach_creds_match(conf, rqstp))
1942			goto out_free_conn;
1943		cs_slot = &conf->cl_cs_slot;
1944		status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1945		if (status == nfserr_replay_cache) {
1946			status = nfsd4_replay_create_session(cr_ses, cs_slot);
1947			goto out_free_conn;
1948		} else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1949			status = nfserr_seq_misordered;
1950			goto out_free_conn;
1951		}
1952	} else if (unconf) {
1953		struct nfs4_client *old;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1954		if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1955		    !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1956			status = nfserr_clid_inuse;
1957			goto out_free_conn;
1958		}
1959		status = nfserr_wrong_cred;
1960		if (!mach_creds_match(unconf, rqstp))
1961			goto out_free_conn;
1962		cs_slot = &unconf->cl_cs_slot;
1963		status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1964		if (status) {
1965			/* an unconfirmed replay returns misordered */
1966			status = nfserr_seq_misordered;
1967			goto out_free_conn;
1968		}
1969		old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1970		if (old) {
1971			status = mark_client_expired(old);
1972			if (status)
1973				goto out_free_conn;
1974			expire_client(old);
1975		}
1976		move_to_confirmed(unconf);
1977		conf = unconf;
1978	} else {
1979		status = nfserr_stale_clientid;
1980		goto out_free_conn;
1981	}
 
 
1982	status = nfs_ok;
1983	/*
1984	 * We do not support RDMA or persistent sessions
1985	 */
1986	cr_ses->flags &= ~SESSION4_PERSIST;
 
1987	cr_ses->flags &= ~SESSION4_RDMA;
 
 
1988
1989	init_session(rqstp, new, conf, cr_ses);
1990	nfsd4_init_conn(rqstp, conn, new);
1991
1992	memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1993	       NFS4_MAX_SESSIONID_LEN);
1994	cs_slot->sl_seqid++;
1995	cr_ses->seqid = cs_slot->sl_seqid;
1996
1997	/* cache solo and embedded create sessions under the state lock */
1998	nfsd4_cache_create_session(cr_ses, cs_slot, status);
1999	nfs4_unlock_state();
 
 
 
 
 
 
 
2000	return status;
 
 
 
 
 
 
 
 
 
 
 
 
 
2001out_free_conn:
2002	nfs4_unlock_state();
2003	free_conn(conn);
2004out_free_session:
2005	__free_session(new);
2006out_release_drc_mem:
2007	nfsd4_put_drc_mem(&cr_ses->fore_channel);
2008	return status;
2009}
2010
2011static __be32 nfsd4_map_bcts_dir(u32 *dir)
2012{
2013	switch (*dir) {
2014	case NFS4_CDFC4_FORE:
2015	case NFS4_CDFC4_BACK:
2016		return nfs_ok;
2017	case NFS4_CDFC4_FORE_OR_BOTH:
2018	case NFS4_CDFC4_BACK_OR_BOTH:
2019		*dir = NFS4_CDFC4_BOTH;
2020		return nfs_ok;
2021	};
2022	return nfserr_inval;
2023}
2024
2025__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
 
 
2026{
 
2027	struct nfsd4_session *session = cstate->session;
2028	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2029	__be32 status;
2030
2031	status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2032	if (status)
2033		return status;
2034	spin_lock(&nn->client_lock);
2035	session->se_cb_prog = bc->bc_cb_program;
2036	session->se_cb_sec = bc->bc_cb_sec;
2037	spin_unlock(&nn->client_lock);
2038
2039	nfsd4_probe_callback(session->se_client);
2040
2041	return nfs_ok;
2042}
2043
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2044__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2045		     struct nfsd4_compound_state *cstate,
2046		     struct nfsd4_bind_conn_to_session *bcts)
2047{
 
2048	__be32 status;
2049	struct nfsd4_conn *conn;
2050	struct nfsd4_session *session;
2051	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
2052
2053	if (!nfsd4_last_compound_op(rqstp))
2054		return nfserr_not_only_op;
2055	nfs4_lock_state();
2056	spin_lock(&nn->client_lock);
2057	session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2058	spin_unlock(&nn->client_lock);
2059	status = nfserr_badsession;
2060	if (!session)
2061		goto out;
2062	status = nfserr_wrong_cred;
2063	if (!mach_creds_match(session->se_client, rqstp))
 
 
 
 
 
 
 
 
 
 
 
2064		goto out;
2065	status = nfsd4_map_bcts_dir(&bcts->dir);
2066	if (status)
2067		goto out;
2068	conn = alloc_conn(rqstp, bcts->dir);
2069	status = nfserr_jukebox;
2070	if (!conn)
2071		goto out;
2072	nfsd4_init_conn(rqstp, conn, session);
2073	status = nfs_ok;
2074out:
2075	nfs4_unlock_state();
 
2076	return status;
2077}
2078
2079static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2080{
2081	if (!session)
2082		return 0;
2083	return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2084}
2085
2086__be32
2087nfsd4_destroy_session(struct svc_rqst *r,
2088		      struct nfsd4_compound_state *cstate,
2089		      struct nfsd4_destroy_session *sessionid)
2090{
 
2091	struct nfsd4_session *ses;
2092	__be32 status;
2093	int ref_held_by_me = 0;
2094	struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
 
2095
2096	nfs4_lock_state();
2097	status = nfserr_not_only_op;
2098	if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2099		if (!nfsd4_last_compound_op(r))
2100			goto out;
2101		ref_held_by_me++;
2102	}
2103	dump_sessionid(__func__, &sessionid->sessionid);
2104	spin_lock(&nn->client_lock);
2105	ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2106	status = nfserr_badsession;
2107	if (!ses)
2108		goto out_client_lock;
2109	status = nfserr_wrong_cred;
2110	if (!mach_creds_match(ses->se_client, r))
2111		goto out_client_lock;
2112	nfsd4_get_session_locked(ses);
2113	status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2114	if (status)
2115		goto out_put_session;
2116	unhash_session(ses);
2117	spin_unlock(&nn->client_lock);
2118
2119	nfsd4_probe_callback_sync(ses->se_client);
2120
2121	spin_lock(&nn->client_lock);
2122	status = nfs_ok;
2123out_put_session:
2124	nfsd4_put_session(ses);
2125out_client_lock:
2126	spin_unlock(&nn->client_lock);
2127out:
2128	nfs4_unlock_state();
2129	return status;
2130}
2131
2132static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2133{
2134	struct nfsd4_conn *c;
2135
2136	list_for_each_entry(c, &s->se_conns, cn_persession) {
2137		if (c->cn_xprt == xpt) {
2138			return c;
2139		}
2140	}
2141	return NULL;
2142}
2143
2144static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2145{
2146	struct nfs4_client *clp = ses->se_client;
2147	struct nfsd4_conn *c;
2148	__be32 status = nfs_ok;
2149	int ret;
2150
2151	spin_lock(&clp->cl_lock);
2152	c = __nfsd4_find_conn(new->cn_xprt, ses);
2153	if (c)
2154		goto out_free;
2155	status = nfserr_conn_not_bound_to_session;
2156	if (clp->cl_mach_cred)
2157		goto out_free;
2158	__nfsd4_hash_conn(new, ses);
2159	spin_unlock(&clp->cl_lock);
2160	ret = nfsd4_register_conn(new);
2161	if (ret)
2162		/* oops; xprt is already down: */
2163		nfsd4_conn_lost(&new->cn_xpt_user);
2164	return nfs_ok;
2165out_free:
2166	spin_unlock(&clp->cl_lock);
2167	free_conn(new);
2168	return status;
2169}
2170
2171static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2172{
2173	struct nfsd4_compoundargs *args = rqstp->rq_argp;
2174
2175	return args->opcnt > session->se_fchannel.maxops;
2176}
2177
2178static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2179				  struct nfsd4_session *session)
2180{
2181	struct xdr_buf *xb = &rqstp->rq_arg;
2182
2183	return xb->len > session->se_fchannel.maxreq_sz;
2184}
2185
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2186__be32
2187nfsd4_sequence(struct svc_rqst *rqstp,
2188	       struct nfsd4_compound_state *cstate,
2189	       struct nfsd4_sequence *seq)
2190{
 
2191	struct nfsd4_compoundres *resp = rqstp->rq_resp;
 
2192	struct nfsd4_session *session;
2193	struct nfs4_client *clp;
2194	struct nfsd4_slot *slot;
2195	struct nfsd4_conn *conn;
2196	__be32 status;
2197	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
 
2198
2199	if (resp->opcnt != 1)
2200		return nfserr_sequence_pos;
2201
2202	/*
2203	 * Will be either used or freed by nfsd4_sequence_check_conn
2204	 * below.
2205	 */
2206	conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2207	if (!conn)
2208		return nfserr_jukebox;
2209
2210	spin_lock(&nn->client_lock);
2211	status = nfserr_badsession;
2212	session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2213	if (!session)
2214		goto out_no_session;
2215	clp = session->se_client;
2216	status = get_client_locked(clp);
2217	if (status)
2218		goto out_no_session;
2219	status = nfsd4_get_session_locked(session);
2220	if (status)
2221		goto out_put_client;
2222
2223	status = nfserr_too_many_ops;
2224	if (nfsd4_session_too_many_ops(rqstp, session))
2225		goto out_put_session;
2226
2227	status = nfserr_req_too_big;
2228	if (nfsd4_request_too_big(rqstp, session))
2229		goto out_put_session;
2230
2231	status = nfserr_badslot;
2232	if (seq->slotid >= session->se_fchannel.maxreqs)
2233		goto out_put_session;
2234
2235	slot = session->se_slots[seq->slotid];
2236	dprintk("%s: slotid %d\n", __func__, seq->slotid);
2237
2238	/* We do not negotiate the number of slots yet, so set the
2239	 * maxslots to the session maxreqs which is used to encode
2240	 * sr_highest_slotid and the sr_target_slot id to maxslots */
2241	seq->maxslots = session->se_fchannel.maxreqs;
2242
 
2243	status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2244					slot->sl_flags & NFSD4_SLOT_INUSE);
2245	if (status == nfserr_replay_cache) {
2246		status = nfserr_seq_misordered;
2247		if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2248			goto out_put_session;
 
 
 
2249		cstate->slot = slot;
2250		cstate->session = session;
 
2251		/* Return the cached reply status and set cstate->status
2252		 * for nfsd4_proc_compound processing */
2253		status = nfsd4_replay_cache_entry(resp, seq);
2254		cstate->status = nfserr_replay_cache;
2255		goto out;
2256	}
2257	if (status)
2258		goto out_put_session;
2259
2260	status = nfsd4_sequence_check_conn(conn, session);
2261	conn = NULL;
2262	if (status)
2263		goto out_put_session;
2264
 
 
 
 
 
 
 
 
 
 
2265	/* Success! bump slot seqid */
2266	slot->sl_seqid = seq->seqid;
2267	slot->sl_flags |= NFSD4_SLOT_INUSE;
2268	if (seq->cachethis)
2269		slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2270	else
2271		slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2272
2273	cstate->slot = slot;
2274	cstate->session = session;
 
2275
2276out:
2277	switch (clp->cl_cb_state) {
2278	case NFSD4_CB_DOWN:
2279		seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2280		break;
2281	case NFSD4_CB_FAULT:
2282		seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2283		break;
2284	default:
2285		seq->status_flags = 0;
2286	}
2287	if (!list_empty(&clp->cl_revoked))
2288		seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
 
 
 
2289out_no_session:
2290	if (conn)
2291		free_conn(conn);
2292	spin_unlock(&nn->client_lock);
2293	return status;
2294out_put_session:
2295	nfsd4_put_session(session);
2296out_put_client:
2297	put_client_renew_locked(clp);
2298	goto out_no_session;
2299}
2300
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2301__be32
2302nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
 
 
2303{
2304	struct nfs4_client *conf, *unconf, *clp;
 
 
2305	__be32 status = 0;
2306	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2307
2308	nfs4_lock_state();
2309	unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2310	conf = find_confirmed_client(&dc->clientid, true, nn);
2311	WARN_ON_ONCE(conf && unconf);
2312
2313	if (conf) {
2314		clp = conf;
2315
2316		if (client_has_state(conf)) {
2317			status = nfserr_clientid_busy;
2318			goto out;
2319		}
 
 
 
 
2320	} else if (unconf)
2321		clp = unconf;
2322	else {
2323		status = nfserr_stale_clientid;
2324		goto out;
2325	}
2326	if (!mach_creds_match(clp, rqstp)) {
 
2327		status = nfserr_wrong_cred;
2328		goto out;
2329	}
2330	expire_client(clp);
 
2331out:
2332	nfs4_unlock_state();
 
 
2333	return status;
2334}
2335
2336__be32
2337nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
 
2338{
 
 
2339	__be32 status = 0;
2340
2341	if (rc->rca_one_fs) {
2342		if (!cstate->current_fh.fh_dentry)
2343			return nfserr_nofilehandle;
2344		/*
2345		 * We don't take advantage of the rca_one_fs case.
2346		 * That's OK, it's optional, we can safely ignore it.
2347		 */
2348		 return nfs_ok;
2349	}
2350
2351	nfs4_lock_state();
2352	status = nfserr_complete_already;
2353	if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2354			     &cstate->session->se_client->cl_flags))
2355		goto out;
2356
2357	status = nfserr_stale_clientid;
2358	if (is_client_expired(cstate->session->se_client))
2359		/*
2360		 * The following error isn't really legal.
2361		 * But we only get here if the client just explicitly
2362		 * destroyed the client.  Surely it no longer cares what
2363		 * error it gets back on an operation for the dead
2364		 * client.
2365		 */
2366		goto out;
2367
2368	status = nfs_ok;
2369	nfsd4_client_record_create(cstate->session->se_client);
 
 
2370out:
2371	nfs4_unlock_state();
2372	return status;
2373}
2374
2375__be32
2376nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2377		  struct nfsd4_setclientid *setclid)
2378{
 
2379	struct xdr_netobj 	clname = setclid->se_name;
2380	nfs4_verifier		clverifier = setclid->se_verf;
2381	struct nfs4_client	*conf, *unconf, *new;
 
2382	__be32 			status;
2383	struct nfsd_net		*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2384
2385	/* Cases below refer to rfc 3530 section 14.2.33: */
2386	nfs4_lock_state();
 
 
2387	conf = find_confirmed_client_by_name(&clname, nn);
2388	if (conf) {
2389		/* case 0: */
2390		status = nfserr_clid_inuse;
2391		if (clp_used_exchangeid(conf))
2392			goto out;
2393		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2394			char addr_str[INET6_ADDRSTRLEN];
2395			rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2396				 sizeof(addr_str));
2397			dprintk("NFSD: setclientid: string in use by client "
2398				"at %s\n", addr_str);
2399			goto out;
2400		}
2401	}
2402	unconf = find_unconfirmed_client_by_name(&clname, nn);
2403	if (unconf)
2404		expire_client(unconf);
2405	status = nfserr_jukebox;
2406	new = create_client(clname, rqstp, &clverifier);
2407	if (new == NULL)
2408		goto out;
2409	if (conf && same_verf(&conf->cl_verifier, &clverifier))
2410		/* case 1: probable callback update */
2411		copy_clid(new, conf);
2412	else /* case 4 (new client) or cases 2, 3 (client reboot): */
2413		gen_clid(new, nn);
2414	new->cl_minorversion = 0;
2415	gen_callback(new, setclid, rqstp);
2416	add_to_unconfirmed(new);
2417	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2418	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2419	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 
2420	status = nfs_ok;
2421out:
2422	nfs4_unlock_state();
 
 
 
 
 
 
2423	return status;
2424}
2425
2426
2427__be32
2428nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2429			 struct nfsd4_compound_state *cstate,
2430			 struct nfsd4_setclientid_confirm *setclientid_confirm)
2431{
 
 
2432	struct nfs4_client *conf, *unconf;
 
2433	nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2434	clientid_t * clid = &setclientid_confirm->sc_clientid;
2435	__be32 status;
2436	struct nfsd_net	*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2437
2438	if (STALE_CLIENTID(clid, nn))
2439		return nfserr_stale_clientid;
2440	nfs4_lock_state();
2441
 
2442	conf = find_confirmed_client(clid, false, nn);
2443	unconf = find_unconfirmed_client(clid, false, nn);
2444	/*
2445	 * We try hard to give out unique clientid's, so if we get an
2446	 * attempt to confirm the same clientid with a different cred,
2447	 * there's a bug somewhere.  Let's charitably assume it's our
2448	 * bug.
 
2449	 */
2450	status = nfserr_serverfault;
2451	if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
 
2452		goto out;
2453	if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
 
 
2454		goto out;
2455	/* cases below refer to rfc 3530 section 14.2.34: */
2456	if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2457		if (conf && !unconf) /* case 2: probable retransmit */
2458			status = nfs_ok;
2459		else /* case 4: client hasn't noticed we rebooted yet? */
2460			status = nfserr_stale_clientid;
2461		goto out;
2462	}
2463	status = nfs_ok;
2464	if (conf) { /* case 1: callback update */
 
 
2465		nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2466		nfsd4_probe_callback(conf);
2467		expire_client(unconf);
2468	} else { /* case 3: normal case; new or rebooted client */
2469		conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2470		if (conf) {
2471			status = mark_client_expired(conf);
2472			if (status)
 
 
 
 
 
 
2473				goto out;
2474			expire_client(conf);
 
2475		}
2476		move_to_confirmed(unconf);
2477		nfsd4_probe_callback(unconf);
2478	}
 
 
 
 
 
 
 
2479out:
2480	nfs4_unlock_state();
 
 
2481	return status;
2482}
2483
2484static struct nfs4_file *nfsd4_alloc_file(void)
2485{
2486	return kmem_cache_alloc(file_slab, GFP_KERNEL);
2487}
2488
2489/* OPEN Share state helper functions */
2490static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2491{
2492	unsigned int hashval = file_hashval(ino);
2493
2494	atomic_set(&fp->fi_ref, 1);
 
 
 
2495	INIT_LIST_HEAD(&fp->fi_stateids);
2496	INIT_LIST_HEAD(&fp->fi_delegations);
2497	fp->fi_inode = igrab(ino);
 
 
2498	fp->fi_had_conflict = false;
2499	fp->fi_lease = NULL;
2500	memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2501	memset(fp->fi_access, 0, sizeof(fp->fi_access));
2502	spin_lock(&recall_lock);
2503	hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2504	spin_unlock(&recall_lock);
2505}
2506
2507static void
2508nfsd4_free_slab(struct kmem_cache **slab)
2509{
2510	if (*slab == NULL)
2511		return;
2512	kmem_cache_destroy(*slab);
2513	*slab = NULL;
2514}
2515
2516void
2517nfsd4_free_slabs(void)
2518{
2519	nfsd4_free_slab(&openowner_slab);
2520	nfsd4_free_slab(&lockowner_slab);
2521	nfsd4_free_slab(&file_slab);
2522	nfsd4_free_slab(&stateid_slab);
2523	nfsd4_free_slab(&deleg_slab);
 
 
2524}
2525
2526int
2527nfsd4_init_slabs(void)
2528{
2529	openowner_slab = kmem_cache_create("nfsd4_openowners",
2530			sizeof(struct nfs4_openowner), 0, 0, NULL);
 
 
2531	if (openowner_slab == NULL)
2532		goto out_nomem;
2533	lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2534			sizeof(struct nfs4_lockowner), 0, 0, NULL);
2535	if (lockowner_slab == NULL)
2536		goto out_nomem;
2537	file_slab = kmem_cache_create("nfsd4_files",
2538			sizeof(struct nfs4_file), 0, 0, NULL);
2539	if (file_slab == NULL)
2540		goto out_nomem;
2541	stateid_slab = kmem_cache_create("nfsd4_stateids",
2542			sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2543	if (stateid_slab == NULL)
2544		goto out_nomem;
2545	deleg_slab = kmem_cache_create("nfsd4_delegations",
2546			sizeof(struct nfs4_delegation), 0, 0, NULL);
2547	if (deleg_slab == NULL)
2548		goto out_nomem;
 
 
 
2549	return 0;
2550out_nomem:
2551	nfsd4_free_slabs();
2552	dprintk("nfsd4: out of memory while initializing nfsv4\n");
 
 
 
 
 
 
 
 
 
 
 
2553	return -ENOMEM;
2554}
2555
2556void nfs4_free_openowner(struct nfs4_openowner *oo)
 
2557{
2558	kfree(oo->oo_owner.so_owner.data);
2559	kmem_cache_free(openowner_slab, oo);
 
 
 
 
 
 
 
2560}
2561
2562void nfs4_free_lockowner(struct nfs4_lockowner *lo)
 
2563{
2564	kfree(lo->lo_owner.so_owner.data);
2565	kmem_cache_free(lockowner_slab, lo);
2566}
2567
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2568static void init_nfs4_replay(struct nfs4_replay *rp)
2569{
2570	rp->rp_status = nfserr_serverfault;
2571	rp->rp_buflen = 0;
2572	rp->rp_buf = rp->rp_ibuf;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2573}
2574
2575static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2576{
2577	struct nfs4_stateowner *sop;
2578
2579	sop = kmem_cache_alloc(slab, GFP_KERNEL);
2580	if (!sop)
2581		return NULL;
2582
2583	sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2584	if (!sop->so_owner.data) {
2585		kmem_cache_free(slab, sop);
2586		return NULL;
2587	}
2588	sop->so_owner.len = owner->len;
2589
2590	INIT_LIST_HEAD(&sop->so_stateids);
2591	sop->so_client = clp;
2592	init_nfs4_replay(&sop->so_replay);
 
2593	return sop;
2594}
2595
2596static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2597{
2598	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2599
2600	list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
 
2601	list_add(&oo->oo_perclient, &clp->cl_openowners);
2602}
2603
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2604static struct nfs4_openowner *
2605alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2606	struct nfs4_openowner *oo;
 
 
 
2607
2608	oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2609	if (!oo)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2610		return NULL;
2611	oo->oo_owner.so_is_open_owner = 1;
2612	oo->oo_owner.so_seqid = open->op_seqid;
2613	oo->oo_flags = NFS4_OO_NEW;
2614	oo->oo_time = 0;
2615	oo->oo_last_closed_stid = NULL;
2616	INIT_LIST_HEAD(&oo->oo_close_lru);
2617	hash_openowner(oo, clp, strhashval);
2618	return oo;
 
 
2619}
2620
2621static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
 
 
 
2622	struct nfs4_openowner *oo = open->op_openowner;
 
 
2623
2624	stp->st_stid.sc_type = NFS4_OPEN_STID;
2625	INIT_LIST_HEAD(&stp->st_lockowners);
2626	list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2627	list_add(&stp->st_perfile, &fp->fi_stateids);
2628	stp->st_stateowner = &oo->oo_owner;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2629	get_nfs4_file(fp);
2630	stp->st_file = fp;
2631	stp->st_access_bmap = 0;
2632	stp->st_deny_bmap = 0;
2633	set_access(open->op_share_access, stp);
2634	set_deny(open->op_share_deny, stp);
2635	stp->st_openstp = NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2636}
2637
 
 
 
 
 
2638static void
2639move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2640{
2641	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
 
 
2642
2643	dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2644
2645	list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2646	oo->oo_time = get_seconds();
2647}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2648
2649static int
2650same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2651							clientid_t *clid)
2652{
2653	return (sop->so_owner.len == owner->len) &&
2654		0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2655		(sop->so_client->cl_clientid.cl_id == clid->cl_id);
 
2656}
2657
2658static struct nfs4_openowner *
2659find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2660			bool sessions, struct nfsd_net *nn)
2661{
2662	struct nfs4_stateowner *so;
2663	struct nfs4_openowner *oo;
2664	struct nfs4_client *clp;
2665
2666	list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2667		if (!so->so_is_open_owner)
2668			continue;
2669		if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2670			oo = openowner(so);
2671			clp = oo->oo_owner.so_client;
2672			if ((bool)clp->cl_minorversion != sessions)
2673				return NULL;
2674			renew_client(oo->oo_owner.so_client);
2675			return oo;
2676		}
2677	}
 
2678	return NULL;
2679}
2680
2681/* search file_hashtbl[] for file */
2682static struct nfs4_file *
2683find_file(struct inode *ino)
 
 
 
 
 
 
 
2684{
2685	unsigned int hashval = file_hashval(ino);
2686	struct nfs4_file *fp;
 
 
 
 
2687
2688	spin_lock(&recall_lock);
2689	hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2690		if (fp->fi_inode == ino) {
2691			get_nfs4_file(fp);
2692			spin_unlock(&recall_lock);
2693			return fp;
2694		}
 
 
 
 
2695	}
2696	spin_unlock(&recall_lock);
2697	return NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2698}
2699
2700/*
2701 * Called to check deny when READ with all zero stateid or
2702 * WRITE with all zero or all one stateid
2703 */
2704static __be32
2705nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2706{
2707	struct inode *ino = current_fh->fh_dentry->d_inode;
2708	struct nfs4_file *fp;
2709	struct nfs4_ol_stateid *stp;
2710	__be32 ret;
2711
2712	fp = find_file(ino);
2713	if (!fp)
2714		return nfs_ok;
2715	ret = nfserr_locked;
2716	/* Search for conflicting share reservations */
2717	list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2718		if (test_deny(deny_type, stp) ||
2719		    test_deny(NFS4_SHARE_DENY_BOTH, stp))
2720			goto out;
2721	}
2722	ret = nfs_ok;
2723out:
2724	put_nfs4_file(fp);
2725	return ret;
2726}
2727
2728static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2729{
2730	struct nfs4_client *clp = dp->dl_stid.sc_client;
2731	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2732
2733	/* We're assuming the state code never drops its reference
2734	 * without first removing the lease.  Since we're in this lease
2735	 * callback (and since the lease code is serialized by the kernel
2736	 * lock) we know the server hasn't removed the lease yet, we know
2737	 * it's safe to take a reference: */
2738	atomic_inc(&dp->dl_count);
2739
2740	list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2741
2742	/* Only place dl_time is set; protected by i_lock: */
2743	dp->dl_time = get_seconds();
2744
2745	nfsd4_cb_recall(dp);
 
 
 
 
 
 
 
 
 
 
 
 
2746}
2747
2748/* Called from break_lease() with i_lock held. */
2749static void nfsd_break_deleg_cb(struct file_lock *fl)
2750{
2751	struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2752	struct nfs4_delegation *dp;
2753
2754	if (!fp) {
2755		WARN(1, "(%p)->fl_owner NULL\n", fl);
2756		return;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2757	}
2758	if (fp->fi_had_conflict) {
2759		WARN(1, "duplicate break on %p\n", fp);
2760		return;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2761	}
 
2762	/*
2763	 * We don't want the locks code to timeout the lease for us;
2764	 * we'll remove it ourself if a delegation isn't returned
2765	 * in time:
2766	 */
2767	fl->fl_break_time = 0;
2768
2769	spin_lock(&recall_lock);
2770	fp->fi_had_conflict = true;
2771	list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2772		nfsd_break_one_deleg(dp);
2773	spin_unlock(&recall_lock);
2774}
2775
2776static
2777int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
 
 
 
 
 
 
 
2778{
2779	if (arg & F_UNLCK)
2780		return lease_modify(onlist, arg);
2781	else
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2782		return -EAGAIN;
2783}
2784
2785static const struct lock_manager_operations nfsd_lease_mng_ops = {
 
2786	.lm_break = nfsd_break_deleg_cb,
2787	.lm_change = nfsd_change_deleg_cb,
2788};
2789
2790static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2791{
2792	if (nfsd4_has_session(cstate))
2793		return nfs_ok;
2794	if (seqid == so->so_seqid - 1)
2795		return nfserr_replay_me;
2796	if (seqid == so->so_seqid)
2797		return nfs_ok;
2798	return nfserr_bad_seqid;
2799}
2800
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2801__be32
2802nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2803		    struct nfsd4_open *open, struct nfsd_net *nn)
2804{
2805	clientid_t *clientid = &open->op_clientid;
2806	struct nfs4_client *clp = NULL;
2807	unsigned int strhashval;
2808	struct nfs4_openowner *oo = NULL;
2809	__be32 status;
2810
2811	if (STALE_CLIENTID(&open->op_clientid, nn))
2812		return nfserr_stale_clientid;
2813	/*
2814	 * In case we need it later, after we've already created the
2815	 * file and don't want to risk a further failure:
2816	 */
2817	open->op_file = nfsd4_alloc_file();
2818	if (open->op_file == NULL)
2819		return nfserr_jukebox;
2820
2821	strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2822	oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
 
 
 
 
 
 
2823	open->op_openowner = oo;
2824	if (!oo) {
2825		clp = find_confirmed_client(clientid, cstate->minorversion,
2826					    nn);
2827		if (clp == NULL)
2828			return nfserr_expired;
2829		goto new_owner;
2830	}
2831	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2832		/* Replace unconfirmed owners without checking for replay. */
2833		clp = oo->oo_owner.so_client;
2834		release_openowner(oo);
2835		open->op_openowner = NULL;
2836		goto new_owner;
2837	}
2838	status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2839	if (status)
2840		return status;
2841	clp = oo->oo_owner.so_client;
2842	goto alloc_stateid;
2843new_owner:
2844	oo = alloc_init_open_stateowner(strhashval, clp, open);
2845	if (oo == NULL)
2846		return nfserr_jukebox;
2847	open->op_openowner = oo;
2848alloc_stateid:
2849	open->op_stp = nfs4_alloc_stateid(clp);
2850	if (!open->op_stp)
2851		return nfserr_jukebox;
 
 
 
 
 
 
 
 
2852	return nfs_ok;
2853}
2854
2855static inline __be32
2856nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2857{
2858	if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2859		return nfserr_openmode;
2860	else
2861		return nfs_ok;
2862}
2863
2864static int share_access_to_flags(u32 share_access)
2865{
2866	return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2867}
2868
2869static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
 
2870{
2871	struct nfs4_stid *ret;
2872
2873	ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2874	if (!ret)
2875		return NULL;
2876	return delegstateid(ret);
2877}
2878
2879static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2880{
2881	return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2882	       open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2883}
2884
2885static __be32
2886nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2887		struct nfs4_delegation **dp)
2888{
2889	int flags;
2890	__be32 status = nfserr_bad_stateid;
 
2891
2892	*dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2893	if (*dp == NULL)
 
 
 
 
 
 
 
 
 
 
2894		goto out;
 
2895	flags = share_access_to_flags(open->op_share_access);
2896	status = nfs4_check_delegmode(*dp, flags);
2897	if (status)
2898		*dp = NULL;
 
 
 
2899out:
2900	if (!nfsd4_is_deleg_cur(open))
2901		return nfs_ok;
2902	if (status)
2903		return status;
2904	open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2905	return nfs_ok;
2906}
2907
2908static __be32
2909nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2910{
2911	struct nfs4_ol_stateid *local;
2912	struct nfs4_openowner *oo = open->op_openowner;
2913
2914	list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2915		/* ignore lock owners */
2916		if (local->st_stateowner->so_is_open_owner == 0)
2917			continue;
2918		/* remember if we have seen this open owner */
2919		if (local->st_stateowner == &oo->oo_owner)
2920			*stpp = local;
2921		/* check for conflicting share reservations */
2922		if (!test_share(local, open))
2923			return nfserr_share_denied;
2924	}
2925	return nfs_ok;
2926}
2927
2928static inline int nfs4_access_to_access(u32 nfs4_access)
2929{
2930	int flags = 0;
2931
2932	if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2933		flags |= NFSD_MAY_READ;
2934	if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2935		flags |= NFSD_MAY_WRITE;
2936	return flags;
2937}
2938
2939static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2940		struct svc_fh *cur_fh, struct nfsd4_open *open)
2941{
2942	__be32 status;
2943	int oflag = nfs4_access_to_omode(open->op_share_access);
2944	int access = nfs4_access_to_access(open->op_share_access);
2945
2946	if (!fp->fi_fds[oflag]) {
2947		status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2948			&fp->fi_fds[oflag]);
2949		if (status)
2950			return status;
2951	}
2952	nfs4_file_get_access(fp, oflag);
2953
2954	return nfs_ok;
2955}
2956
2957static inline __be32
2958nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2959		struct nfsd4_open *open)
2960{
2961	struct iattr iattr = {
2962		.ia_valid = ATTR_SIZE,
2963		.ia_size = 0,
2964	};
 
 
 
2965	if (!open->op_truncate)
2966		return 0;
2967	if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2968		return nfserr_inval;
2969	return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2970}
2971
2972static __be32
2973nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
 
2974{
2975	u32 op_share_access = open->op_share_access;
2976	bool new_access;
2977	__be32 status;
 
 
 
2978
2979	new_access = !test_access(op_share_access, stp);
2980	if (new_access) {
2981		status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2982		if (status)
2983			return status;
 
 
 
 
 
 
 
 
 
 
 
 
2984	}
2985	status = nfsd4_truncate(rqstp, cur_fh, open);
2986	if (status) {
2987		if (new_access) {
2988			int oflag = nfs4_access_to_omode(op_share_access);
2989			nfs4_file_put_access(fp, oflag);
 
 
2990		}
2991		return status;
 
 
 
 
2992	}
2993	/* remember the open */
2994	set_access(op_share_access, stp);
 
 
 
 
 
2995	set_deny(open->op_share_deny, stp);
 
2996
2997	return nfs_ok;
2998}
2999
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3000
3001static void
3002nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3003{
3004	open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3005}
3006
3007/* Should we give out recallable state?: */
3008static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3009{
3010	if (clp->cl_cb_state == NFSD4_CB_UP)
3011		return true;
3012	/*
3013	 * In the sessions case, since we don't have to establish a
3014	 * separate connection for callbacks, we assume it's OK
3015	 * until we hear otherwise:
3016	 */
3017	return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3018}
3019
3020static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
 
3021{
3022	struct file_lock *fl;
3023
3024	fl = locks_alloc_lock();
3025	if (!fl)
3026		return NULL;
3027	locks_init_lock(fl);
3028	fl->fl_lmops = &nfsd_lease_mng_ops;
3029	fl->fl_flags = FL_DELEG;
3030	fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3031	fl->fl_end = OFFSET_MAX;
3032	fl->fl_owner = (fl_owner_t)(dp->dl_file);
3033	fl->fl_pid = current->tgid;
3034	return fl;
3035}
3036
3037static int nfs4_setlease(struct nfs4_delegation *dp)
 
3038{
3039	struct nfs4_file *fp = dp->dl_file;
3040	struct file_lock *fl;
3041	int status;
 
3042
3043	fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3044	if (!fl)
3045		return -ENOMEM;
3046	fl->fl_file = find_readable_file(fp);
3047	status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3048	if (status)
3049		goto out_free;
3050	list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3051	fp->fi_lease = fl;
3052	fp->fi_deleg_file = get_file(fl->fl_file);
3053	atomic_set(&fp->fi_delegees, 1);
3054	list_add(&dp->dl_perfile, &fp->fi_delegations);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3055	return 0;
3056out_free:
3057	locks_free_lock(fl);
3058	return status;
3059}
3060
3061static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
 
 
 
 
 
 
 
3062{
3063	int status;
 
 
 
 
 
 
3064
3065	if (fp->fi_had_conflict)
3066		return -EAGAIN;
3067	get_nfs4_file(fp);
3068	dp->dl_file = fp;
3069	if (!fp->fi_lease) {
3070		status = nfs4_setlease(dp);
3071		if (status)
3072			goto out_free;
3073		return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3074	}
3075	spin_lock(&recall_lock);
3076	if (fp->fi_had_conflict) {
3077		spin_unlock(&recall_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
3078		status = -EAGAIN;
3079		goto out_free;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3080	}
3081	atomic_inc(&fp->fi_delegees);
3082	list_add(&dp->dl_perfile, &fp->fi_delegations);
3083	spin_unlock(&recall_lock);
3084	list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3085	return 0;
3086out_free:
3087	put_nfs4_file(fp);
3088	dp->dl_file = fp;
3089	return status;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3090}
3091
3092static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3093{
3094	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3095	if (status == -EAGAIN)
3096		open->op_why_no_deleg = WND4_CONTENTION;
3097	else {
3098		open->op_why_no_deleg = WND4_RESOURCE;
3099		switch (open->op_deleg_want) {
3100		case NFS4_SHARE_WANT_READ_DELEG:
3101		case NFS4_SHARE_WANT_WRITE_DELEG:
3102		case NFS4_SHARE_WANT_ANY_DELEG:
3103			break;
3104		case NFS4_SHARE_WANT_CANCEL:
3105			open->op_why_no_deleg = WND4_CANCELLED;
3106			break;
3107		case NFS4_SHARE_WANT_NO_DELEG:
3108			WARN_ON_ONCE(1);
3109		}
3110	}
3111}
3112
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3113/*
3114 * Attempt to hand out a delegation.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3115 *
3116 * Note we don't support write delegations, and won't until the vfs has
3117 * proper support for them.
 
 
 
 
3118 */
3119static void
3120nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3121		     struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3122{
3123	struct nfs4_delegation *dp;
3124	struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
 
 
3125	int cb_up;
3126	int status = 0;
 
3127
3128	cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3129	open->op_recall = 0;
3130	switch (open->op_claim_type) {
3131		case NFS4_OPEN_CLAIM_PREVIOUS:
3132			if (!cb_up)
3133				open->op_recall = 1;
3134			if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3135				goto out_no_deleg;
3136			break;
3137		case NFS4_OPEN_CLAIM_NULL:
 
 
3138		case NFS4_OPEN_CLAIM_FH:
3139			/*
3140			 * Let's not give out any delegations till everyone's
3141			 * had the chance to reclaim theirs....
 
3142			 */
3143			if (locks_in_grace(net))
3144				goto out_no_deleg;
3145			if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3146				goto out_no_deleg;
3147			/*
3148			 * Also, if the file was opened for write or
3149			 * create, there's a good chance the client's
3150			 * about to write to it, resulting in an
3151			 * immediate recall (since we don't support
3152			 * write delegations):
3153			 */
3154			if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3155				goto out_no_deleg;
3156			if (open->op_create == NFS4_OPEN_CREATE)
3157				goto out_no_deleg;
3158			break;
3159		default:
3160			goto out_no_deleg;
3161	}
3162	dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3163	if (dp == NULL)
3164		goto out_no_deleg;
3165	status = nfs4_set_delegation(dp, stp->st_file);
3166	if (status)
3167		goto out_free;
3168
3169	memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3170
3171	dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3172		STATEID_VAL(&dp->dl_stid.sc_stateid));
3173	open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
 
 
 
 
 
 
 
 
 
 
 
 
3174	return;
3175out_free:
3176	remove_stid(&dp->dl_stid);
3177	nfs4_put_delegation(dp);
3178out_no_deleg:
3179	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3180	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3181	    open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3182		dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3183		open->op_recall = 1;
3184	}
3185
3186	/* 4.1 client asking for a delegation? */
3187	if (open->op_deleg_want)
3188		nfsd4_open_deleg_none_ext(open, status);
3189	return;
3190}
3191
3192static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3193					struct nfs4_delegation *dp)
3194{
3195	if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3196	    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3197		open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3198		open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3199	} else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3200		   dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3201		open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3202		open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3203	}
3204	/* Otherwise the client must be confused wanting a delegation
3205	 * it already has, therefore we don't return
3206	 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3207	 */
3208}
3209
3210/*
3211 * called with nfs4_lock_state() held.
 
 
 
 
 
 
 
 
 
3212 */
3213__be32
3214nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3215{
3216	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3217	struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3218	struct nfs4_file *fp = NULL;
3219	struct inode *ino = current_fh->fh_dentry->d_inode;
3220	struct nfs4_ol_stateid *stp = NULL;
3221	struct nfs4_delegation *dp = NULL;
3222	__be32 status;
 
3223
3224	/*
3225	 * Lookup file; if found, lookup stateid and check open request,
3226	 * and check for delegations in the process of being recalled.
3227	 * If not found, create the nfs4_file struct
3228	 */
3229	fp = find_file(ino);
3230	if (fp) {
3231		if ((status = nfs4_check_open(fp, open, &stp)))
3232			goto out;
3233		status = nfs4_check_deleg(cl, open, &dp);
3234		if (status)
3235			goto out;
 
3236	} else {
 
3237		status = nfserr_bad_stateid;
3238		if (nfsd4_is_deleg_cur(open))
3239			goto out;
3240		status = nfserr_jukebox;
3241		fp = open->op_file;
3242		open->op_file = NULL;
3243		nfsd4_init_file(fp, ino);
 
 
 
 
 
 
 
3244	}
3245
3246	/*
3247	 * OPEN the file, or upgrade an existing OPEN.
3248	 * If truncate fails, the OPEN fails.
 
 
3249	 */
3250	if (stp) {
3251		/* Stateid was found, this is an OPEN upgrade */
3252		status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3253		if (status)
 
3254			goto out;
 
3255	} else {
3256		status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3257		if (status)
3258			goto out;
3259		status = nfsd4_truncate(rqstp, current_fh, open);
3260		if (status)
3261			goto out;
3262		stp = open->op_stp;
3263		open->op_stp = NULL;
3264		init_open_stateid(stp, fp, open);
 
 
 
3265	}
3266	update_stateid(&stp->st_stid.sc_stateid);
3267	memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3268
3269	if (nfsd4_has_session(&resp->cstate)) {
3270		open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3271
 
3272		if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3273			open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3274			open->op_why_no_deleg = WND4_NOT_WANTED;
3275			goto nodeleg;
3276		}
3277	}
3278
3279	/*
3280	* Attempt to hand out a delegation. No error return, because the
3281	* OPEN succeeds even if we fail.
3282	*/
3283	nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3284nodeleg:
3285	status = nfs_ok;
3286
3287	dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3288		STATEID_VAL(&stp->st_stid.sc_stateid));
3289out:
3290	/* 4.1 client trying to upgrade/downgrade delegation? */
3291	if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3292	    open->op_deleg_want)
3293		nfsd4_deleg_xgrade_none_ext(open, dp);
3294
3295	if (fp)
3296		put_nfs4_file(fp);
3297	if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3298		nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3299	/*
3300	* To finish the open response, we just need to set the rflags.
3301	*/
3302	open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3303	if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3304	    !nfsd4_has_session(&resp->cstate))
 
3305		open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3306
 
 
 
 
 
3307	return status;
3308}
3309
3310void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
 
3311{
3312	if (open->op_openowner) {
3313		struct nfs4_openowner *oo = open->op_openowner;
3314
3315		if (!list_empty(&oo->oo_owner.so_stateids))
3316			list_del_init(&oo->oo_close_lru);
3317		if (oo->oo_flags & NFS4_OO_NEW) {
3318			if (status) {
3319				release_openowner(oo);
3320				open->op_openowner = NULL;
3321			} else
3322				oo->oo_flags &= ~NFS4_OO_NEW;
3323		}
3324	}
3325	if (open->op_file)
3326		nfsd4_free_file(open->op_file);
3327	if (open->op_stp)
3328		free_generic_stateid(open->op_stp);
3329}
3330
3331static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3332{
3333	struct nfs4_client *found;
3334
3335	if (STALE_CLIENTID(clid, nn))
3336		return nfserr_stale_clientid;
3337	found = find_confirmed_client(clid, session, nn);
3338	if (clp)
3339		*clp = found;
3340	return found ? nfs_ok : nfserr_expired;
3341}
3342
3343__be32
3344nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3345	    clientid_t *clid)
3346{
 
3347	struct nfs4_client *clp;
3348	__be32 status;
3349	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3350
3351	nfs4_lock_state();
3352	dprintk("process_renew(%08x/%08x): starting\n", 
3353			clid->cl_boot, clid->cl_id);
3354	status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3355	if (status)
3356		goto out;
3357	status = nfserr_cb_path_down;
3358	if (!list_empty(&clp->cl_delegations)
3359			&& clp->cl_cb_state != NFSD4_CB_UP)
3360		goto out;
3361	status = nfs_ok;
3362out:
3363	nfs4_unlock_state();
3364	return status;
3365}
3366
3367static void
3368nfsd4_end_grace(struct nfsd_net *nn)
3369{
3370	/* do nothing if grace period already ended */
3371	if (nn->grace_ended)
3372		return;
3373
3374	dprintk("NFSD: end of grace period\n");
3375	nn->grace_ended = true;
3376	nfsd4_record_grace_done(nn, nn->boot_time);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3377	locks_end_grace(&nn->nfsd4_manager);
3378	/*
3379	 * Now that every NFSv4 client has had the chance to recover and
3380	 * to see the (possibly new, possibly shorter) lease time, we
3381	 * can safely set the next grace time to the current lease time:
3382	 */
3383	nn->nfsd4_grace = nn->nfsd4_lease;
3384}
3385
3386static time_t
3387nfs4_laundromat(struct nfsd_net *nn)
 
 
 
3388{
3389	struct nfs4_client *clp;
3390	struct nfs4_openowner *oo;
3391	struct nfs4_delegation *dp;
3392	struct list_head *pos, *next, reaplist;
3393	time_t cutoff = get_seconds() - nn->nfsd4_lease;
3394	time_t t, clientid_val = nn->nfsd4_lease;
3395	time_t u, test_val = nn->nfsd4_lease;
3396
3397	nfs4_lock_state();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3398
3399	dprintk("NFSD: laundromat service - starting\n");
3400	nfsd4_end_grace(nn);
3401	INIT_LIST_HEAD(&reaplist);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3402	spin_lock(&nn->client_lock);
3403	list_for_each_safe(pos, next, &nn->client_lru) {
3404		clp = list_entry(pos, struct nfs4_client, cl_lru);
3405		if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3406			t = clp->cl_time - cutoff;
3407			if (clientid_val > t)
3408				clientid_val = t;
3409			break;
 
 
 
 
3410		}
3411		if (mark_client_expired_locked(clp)) {
3412			dprintk("NFSD: client in use (clientid %08x)\n",
3413				clp->cl_clientid.cl_id);
3414			continue;
 
 
 
 
 
3415		}
3416		list_move(&clp->cl_lru, &reaplist);
3417	}
3418	spin_unlock(&nn->client_lock);
3419	list_for_each_safe(pos, next, &reaplist) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3420		clp = list_entry(pos, struct nfs4_client, cl_lru);
3421		dprintk("NFSD: purging unused client (clientid %08x)\n",
3422			clp->cl_clientid.cl_id);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3423		expire_client(clp);
3424	}
3425	spin_lock(&recall_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3426	list_for_each_safe(pos, next, &nn->del_recall_lru) {
3427		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3428		if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3429			continue;
3430		if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3431			u = dp->dl_time - cutoff;
3432			if (test_val > u)
3433				test_val = u;
3434			break;
3435		}
3436		list_move(&dp->dl_recall_lru, &reaplist);
 
3437	}
3438	spin_unlock(&recall_lock);
3439	list_for_each_safe(pos, next, &reaplist) {
3440		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
 
 
3441		revoke_delegation(dp);
3442	}
3443	test_val = nn->nfsd4_lease;
3444	list_for_each_safe(pos, next, &nn->close_lru) {
3445		oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3446		if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3447			u = oo->oo_time - cutoff;
3448			if (test_val > u)
3449				test_val = u;
3450			break;
3451		}
3452		release_openowner(oo);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3453	}
3454	if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3455		clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3456	nfs4_unlock_state();
3457	return clientid_val;
 
 
 
 
 
 
 
 
 
 
 
 
3458}
3459
3460static struct workqueue_struct *laundry_wq;
3461static void laundromat_main(struct work_struct *);
3462
3463static void
3464laundromat_main(struct work_struct *laundry)
3465{
3466	time_t t;
3467	struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3468						  work);
3469	struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3470					   laundromat_work);
3471
3472	t = nfs4_laundromat(nn);
3473	dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3474	queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3475}
3476
3477static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
 
3478{
3479	if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3480		return nfserr_bad_stateid;
3481	return nfs_ok;
 
3482}
3483
3484static inline int
3485access_permit_read(struct nfs4_ol_stateid *stp)
3486{
3487	return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3488		test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3489		test_access(NFS4_SHARE_ACCESS_WRITE, stp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3490}
3491
3492static inline int
3493access_permit_write(struct nfs4_ol_stateid *stp)
3494{
3495	return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3496		test_access(NFS4_SHARE_ACCESS_BOTH, stp);
 
 
 
 
 
 
 
 
 
 
3497}
3498
3499static
3500__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3501{
3502        __be32 status = nfserr_openmode;
3503
3504	/* For lock stateid's, we test the parent open, not the lock: */
3505	if (stp->st_openstp)
3506		stp = stp->st_openstp;
3507	if ((flags & WR_STATE) && !access_permit_write(stp))
3508                goto out;
3509	if ((flags & RD_STATE) && !access_permit_read(stp))
3510                goto out;
3511	status = nfs_ok;
3512out:
3513	return status;
3514}
3515
3516static inline __be32
3517check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3518{
3519	if (ONE_STATEID(stateid) && (flags & RD_STATE))
3520		return nfs_ok;
3521	else if (locks_in_grace(net)) {
3522		/* Answer in remaining cases depends on existence of
3523		 * conflicting state; so we must wait out the grace period. */
3524		return nfserr_grace;
3525	} else if (flags & WR_STATE)
3526		return nfs4_share_conflict(current_fh,
3527				NFS4_SHARE_DENY_WRITE);
3528	else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3529		return nfs4_share_conflict(current_fh,
3530				NFS4_SHARE_DENY_READ);
3531}
3532
3533/*
3534 * Allow READ/WRITE during grace period on recovered state only for files
3535 * that are not able to provide mandatory locking.
3536 */
3537static inline int
3538grace_disallows_io(struct net *net, struct inode *inode)
3539{
3540	return locks_in_grace(net) && mandatory_lock(inode);
3541}
3542
3543/* Returns true iff a is later than b: */
3544static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3545{
3546	return (s32)(a->si_generation - b->si_generation) > 0;
3547}
3548
3549static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3550{
3551	/*
3552	 * When sessions are used the stateid generation number is ignored
3553	 * when it is zero.
3554	 */
3555	if (has_session && in->si_generation == 0)
3556		return nfs_ok;
3557
3558	if (in->si_generation == ref->si_generation)
3559		return nfs_ok;
3560
3561	/* If the client sends us a stateid from the future, it's buggy: */
3562	if (stateid_generation_after(in, ref))
3563		return nfserr_bad_stateid;
3564	/*
3565	 * However, we could see a stateid from the past, even from a
3566	 * non-buggy client.  For example, if the client sends a lock
3567	 * while some IO is outstanding, the lock may bump si_generation
3568	 * while the IO is still in flight.  The client could avoid that
3569	 * situation by waiting for responses on all the IO requests,
3570	 * but better performance may result in retrying IO that
3571	 * receives an old_stateid error if requests are rarely
3572	 * reordered in flight:
3573	 */
3574	return nfserr_old_stateid;
3575}
3576
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3577static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3578{
3579	struct nfs4_stid *s;
3580	struct nfs4_ol_stateid *ols;
3581	__be32 status;
3582
3583	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3584		return nfserr_bad_stateid;
3585	/* Client debugging aid. */
3586	if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3587		char addr_str[INET6_ADDRSTRLEN];
3588		rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3589				 sizeof(addr_str));
3590		pr_warn_ratelimited("NFSD: client %s testing state ID "
3591					"with incorrect client ID\n", addr_str);
3592		return nfserr_bad_stateid;
3593	}
3594	s = find_stateid(cl, stateid);
3595	if (!s)
3596		return nfserr_bad_stateid;
3597	status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3598	if (status)
3599		return status;
 
 
 
 
3600	switch (s->sc_type) {
3601	case NFS4_DELEG_STID:
3602		return nfs_ok;
3603	case NFS4_REVOKED_DELEG_STID:
3604		return nfserr_deleg_revoked;
3605	case NFS4_OPEN_STID:
3606	case NFS4_LOCK_STID:
3607		ols = openlockstateid(s);
3608		if (ols->st_stateowner->so_is_open_owner
3609	    			&& !(openowner(ols->st_stateowner)->oo_flags
3610						& NFS4_OO_CONFIRMED))
3611			return nfserr_bad_stateid;
3612		return nfs_ok;
3613	default:
3614		printk("unknown stateid type %x\n", s->sc_type);
3615	case NFS4_CLOSED_STID:
3616		return nfserr_bad_stateid;
3617	}
 
 
 
 
 
3618}
3619
3620static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3621				   struct nfs4_stid **s, bool sessions,
3622				   struct nfsd_net *nn)
 
 
3623{
3624	struct nfs4_client *cl;
3625	__be32 status;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3626
3627	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
 
3628		return nfserr_bad_stateid;
3629	status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3630							nn, &cl);
3631	if (status == nfserr_stale_clientid) {
3632		if (sessions)
3633			return nfserr_bad_stateid;
3634		return nfserr_stale_stateid;
3635	}
3636	if (status)
3637		return status;
3638	*s = find_stateid_by_type(cl, stateid, typemask);
3639	if (!*s)
3640		return nfserr_bad_stateid;
 
 
 
 
 
 
 
 
 
 
3641	return nfs_ok;
3642}
3643
3644/*
3645* Checks for stateid operations
3646*/
3647__be32
3648nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3649			   stateid_t *stateid, int flags, struct file **filpp)
3650{
3651	struct nfs4_stid *s;
3652	struct nfs4_ol_stateid *stp = NULL;
3653	struct nfs4_delegation *dp = NULL;
3654	struct svc_fh *current_fh = &cstate->current_fh;
3655	struct inode *ino = current_fh->fh_dentry->d_inode;
3656	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3657	__be32 status;
3658
3659	if (filpp)
3660		*filpp = NULL;
 
 
 
 
 
 
 
 
 
 
 
3661
3662	if (grace_disallows_io(net, ino))
3663		return nfserr_grace;
3664
3665	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3666		return check_special_stateids(net, current_fh, stateid, flags);
 
 
3667
3668	status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3669				      &s, cstate->minorversion, nn);
3670	if (status)
3671		return status;
3672	status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3673	if (status)
3674		goto out;
3675	switch (s->sc_type) {
3676	case NFS4_DELEG_STID:
3677		dp = delegstateid(s);
3678		status = nfs4_check_delegmode(dp, flags);
3679		if (status)
 
 
 
 
 
 
 
 
 
 
3680			goto out;
3681		if (filpp) {
3682			*filpp = dp->dl_file->fi_deleg_file;
3683			if (!*filpp) {
3684				WARN_ON_ONCE(1);
3685				status = nfserr_serverfault;
3686				goto out;
3687			}
3688		}
3689		break;
3690	case NFS4_OPEN_STID:
3691	case NFS4_LOCK_STID:
3692		stp = openlockstateid(s);
3693		status = nfs4_check_fh(current_fh, stp);
3694		if (status)
3695			goto out;
3696		if (stp->st_stateowner->so_is_open_owner
3697		    && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3698			goto out;
3699		status = nfs4_check_openmode(stp, flags);
3700		if (status)
3701			goto out;
3702		if (filpp) {
3703			if (flags & RD_STATE)
3704				*filpp = find_readable_file(stp->st_file);
3705			else
3706				*filpp = find_writeable_file(stp->st_file);
3707		}
3708		break;
3709	default:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3710		return nfserr_bad_stateid;
 
 
 
 
 
 
 
 
 
 
 
 
 
3711	}
3712	status = nfs_ok;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3713out:
 
3714	return status;
3715}
3716
3717static __be32
3718nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3719{
3720	struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3721
3722	if (check_for_locks(stp->st_file, lo))
3723		return nfserr_locks_held;
3724	/*
3725	 * Currently there's a 1-1 lock stateid<->lockowner
3726	 * correspondance, and we have to delete the lockowner when we
3727	 * delete the lock stateid:
3728	 */
3729	unhash_lockowner(lo);
3730	return nfs_ok;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3731}
3732
3733/*
3734 * Test if the stateid is valid
3735 */
3736__be32
3737nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3738		   struct nfsd4_test_stateid *test_stateid)
3739{
 
3740	struct nfsd4_test_stateid_id *stateid;
3741	struct nfs4_client *cl = cstate->session->se_client;
3742
3743	nfs4_lock_state();
3744	list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3745		stateid->ts_id_status =
3746			nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3747	nfs4_unlock_state();
3748
3749	return nfs_ok;
3750}
3751
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3752__be32
3753nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3754		   struct nfsd4_free_stateid *free_stateid)
3755{
 
3756	stateid_t *stateid = &free_stateid->fr_stateid;
3757	struct nfs4_stid *s;
3758	struct nfs4_delegation *dp;
3759	struct nfs4_client *cl = cstate->session->se_client;
3760	__be32 ret = nfserr_bad_stateid;
3761
3762	nfs4_lock_state();
3763	s = find_stateid(cl, stateid);
3764	if (!s)
 
 
 
 
3765		goto out;
 
 
3766	switch (s->sc_type) {
3767	case NFS4_DELEG_STID:
 
 
 
 
 
 
 
 
 
 
 
 
3768		ret = nfserr_locks_held;
3769		goto out;
3770	case NFS4_OPEN_STID:
3771	case NFS4_LOCK_STID:
3772		ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3773		if (ret)
3774			goto out;
3775		if (s->sc_type == NFS4_LOCK_STID)
3776			ret = nfsd4_free_lock_stateid(openlockstateid(s));
3777		else
3778			ret = nfserr_locks_held;
3779		break;
3780	case NFS4_REVOKED_DELEG_STID:
3781		dp = delegstateid(s);
3782		destroy_revoked_delegation(dp);
3783		ret = nfs_ok;
3784		break;
3785	default:
3786		ret = nfserr_bad_stateid;
 
 
 
 
3787	}
 
 
 
3788out:
3789	nfs4_unlock_state();
3790	return ret;
3791}
3792
3793static inline int
3794setlkflg (int type)
3795{
3796	return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3797		RD_STATE : WR_STATE;
3798}
3799
3800static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3801{
3802	struct svc_fh *current_fh = &cstate->current_fh;
3803	struct nfs4_stateowner *sop = stp->st_stateowner;
3804	__be32 status;
3805
3806	status = nfsd4_check_seqid(cstate, sop, seqid);
3807	if (status)
3808		return status;
3809	if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3810		|| stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3811		/*
3812		 * "Closed" stateid's exist *only* to return
3813		 * nfserr_replay_me from the previous step, and
3814		 * revoked delegations are kept only for free_stateid.
3815		 */
3816		return nfserr_bad_stateid;
3817	status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3818	if (status)
3819		return status;
3820	return nfs4_check_fh(current_fh, stp);
 
 
 
 
 
3821}
3822
3823/* 
3824 * Checks for sequence id mutating operations. 
 
 
 
 
 
 
 
 
 
 
 
3825 */
3826static __be32
3827nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3828			 stateid_t *stateid, char typemask,
 
3829			 struct nfs4_ol_stateid **stpp,
3830			 struct nfsd_net *nn)
3831{
3832	__be32 status;
3833	struct nfs4_stid *s;
 
3834
3835	dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3836		seqid, STATEID_VAL(stateid));
3837
3838	*stpp = NULL;
3839	status = nfsd4_lookup_stateid(stateid, typemask, &s,
3840				      cstate->minorversion, nn);
 
3841	if (status)
3842		return status;
3843	*stpp = openlockstateid(s);
3844	if (!nfsd4_has_session(cstate))
3845		cstate->replay_owner = (*stpp)->st_stateowner;
 
 
3846
3847	return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
 
 
 
 
 
3848}
3849
3850static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3851						 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3852{
3853	__be32 status;
3854	struct nfs4_openowner *oo;
 
3855
3856	status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3857						NFS4_OPEN_STID, stpp, nn);
3858	if (status)
3859		return status;
3860	oo = openowner((*stpp)->st_stateowner);
3861	if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
 
 
3862		return nfserr_bad_stateid;
 
 
3863	return nfs_ok;
3864}
3865
3866__be32
3867nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3868		   struct nfsd4_open_confirm *oc)
3869{
 
3870	__be32 status;
3871	struct nfs4_openowner *oo;
3872	struct nfs4_ol_stateid *stp;
3873	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3874
3875	dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
3876			cstate->current_fh.fh_dentry);
3877
3878	status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3879	if (status)
3880		return status;
3881
3882	nfs4_lock_state();
3883
3884	status = nfs4_preprocess_seqid_op(cstate,
3885					oc->oc_seqid, &oc->oc_req_stateid,
3886					NFS4_OPEN_STID, &stp, nn);
3887	if (status)
3888		goto out;
3889	oo = openowner(stp->st_stateowner);
3890	status = nfserr_bad_stateid;
3891	if (oo->oo_flags & NFS4_OO_CONFIRMED)
3892		goto out;
 
 
3893	oo->oo_flags |= NFS4_OO_CONFIRMED;
3894	update_stateid(&stp->st_stid.sc_stateid);
3895	memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3896	dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3897		__func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3898
3899	nfsd4_client_record_create(oo->oo_owner.so_client);
3900	status = nfs_ok;
 
 
3901out:
3902	nfsd4_bump_seqid(cstate, status);
3903	if (!cstate->replay_owner)
3904		nfs4_unlock_state();
3905	return status;
3906}
3907
3908static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3909{
3910	if (!test_access(access, stp))
3911		return;
3912	nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3913	clear_access(access, stp);
3914}
3915
3916static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3917{
3918	switch (to_access) {
3919	case NFS4_SHARE_ACCESS_READ:
3920		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3921		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3922		break;
3923	case NFS4_SHARE_ACCESS_WRITE:
3924		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3925		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3926		break;
3927	case NFS4_SHARE_ACCESS_BOTH:
3928		break;
3929	default:
3930		WARN_ON_ONCE(1);
3931	}
3932}
3933
3934static void
3935reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3936{
3937	int i;
3938	for (i = 0; i < 4; i++) {
3939		if ((i & deny) != i)
3940			clear_deny(i, stp);
3941	}
3942}
3943
3944__be32
3945nfsd4_open_downgrade(struct svc_rqst *rqstp,
3946		     struct nfsd4_compound_state *cstate,
3947		     struct nfsd4_open_downgrade *od)
3948{
 
3949	__be32 status;
3950	struct nfs4_ol_stateid *stp;
3951	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3952
3953	dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", 
3954			cstate->current_fh.fh_dentry);
3955
3956	/* We don't yet support WANT bits: */
3957	if (od->od_deleg_want)
3958		dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3959			od->od_deleg_want);
3960
3961	nfs4_lock_state();
3962	status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3963					&od->od_stateid, &stp, nn);
3964	if (status)
3965		goto out; 
3966	status = nfserr_inval;
3967	if (!test_access(od->od_share_access, stp)) {
3968		dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3969			stp->st_access_bmap, od->od_share_access);
3970		goto out;
3971	}
3972	if (!test_deny(od->od_share_deny, stp)) {
3973		dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3974			stp->st_deny_bmap, od->od_share_deny);
3975		goto out;
3976	}
3977	nfs4_stateid_downgrade(stp, od->od_share_access);
3978
3979	reset_union_bmap_deny(od->od_share_deny, stp);
3980
3981	update_stateid(&stp->st_stid.sc_stateid);
3982	memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3983	status = nfs_ok;
 
 
 
3984out:
3985	nfsd4_bump_seqid(cstate, status);
3986	if (!cstate->replay_owner)
3987		nfs4_unlock_state();
3988	return status;
3989}
3990
3991static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3992{
3993	unhash_open_stateid(s);
3994	s->st_stid.sc_type = NFS4_CLOSED_STID;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3995}
3996
3997/*
3998 * nfs4_unlock_state() called after encode
3999 */
4000__be32
4001nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4002	    struct nfsd4_close *close)
4003{
 
4004	__be32 status;
4005	struct nfs4_openowner *oo;
4006	struct nfs4_ol_stateid *stp;
4007	struct net *net = SVC_NET(rqstp);
4008	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
4009
4010	dprintk("NFSD: nfsd4_close on file %pd\n", 
4011			cstate->current_fh.fh_dentry);
4012
4013	nfs4_lock_state();
4014	status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4015					&close->cl_stateid,
4016					NFS4_OPEN_STID|NFS4_CLOSED_STID,
4017					&stp, nn);
4018	nfsd4_bump_seqid(cstate, status);
4019	if (status)
4020		goto out; 
4021	oo = openowner(stp->st_stateowner);
4022	update_stateid(&stp->st_stid.sc_stateid);
4023	memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4024
4025	nfsd4_close_open_stateid(stp);
 
 
4026
4027	if (cstate->minorversion)
4028		free_generic_stateid(stp);
4029	else
4030		oo->oo_last_closed_stid = stp;
 
 
 
4031
4032	if (list_empty(&oo->oo_owner.so_stateids)) {
4033		if (cstate->minorversion)
4034			release_openowner(oo);
4035		else {
4036			/*
4037			 * In the 4.0 case we need to keep the owners around a
4038			 * little while to handle CLOSE replay.
4039			 */
4040			move_to_close_lru(oo, SVC_NET(rqstp));
4041		}
4042	}
 
 
 
 
 
4043out:
4044	if (!cstate->replay_owner)
4045		nfs4_unlock_state();
4046	return status;
4047}
4048
4049__be32
4050nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4051		  struct nfsd4_delegreturn *dr)
4052{
 
4053	struct nfs4_delegation *dp;
4054	stateid_t *stateid = &dr->dr_stateid;
4055	struct nfs4_stid *s;
4056	__be32 status;
4057	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4058
4059	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4060		return status;
4061
4062	nfs4_lock_state();
4063	status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4064				      cstate->minorversion, nn);
4065	if (status)
4066		goto out;
4067	dp = delegstateid(s);
4068	status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4069	if (status)
4070		goto out;
4071
 
4072	destroy_delegation(dp);
 
 
 
 
4073out:
4074	nfs4_unlock_state();
4075
4076	return status;
4077}
4078
4079
4080#define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4081
4082#define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4083
4084static inline u64
4085end_offset(u64 start, u64 len)
4086{
4087	u64 end;
4088
4089	end = start + len;
4090	return end >= start ? end: NFS4_MAX_UINT64;
4091}
4092
4093/* last octet in a range */
4094static inline u64
4095last_byte_offset(u64 start, u64 len)
4096{
4097	u64 end;
4098
4099	WARN_ON_ONCE(!len);
4100	end = start + len;
4101	return end > start ? end - 1: NFS4_MAX_UINT64;
4102}
4103
4104static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4105{
4106	return (file_hashval(inode) + cl_id
4107			+ opaque_hashval(ownername->data, ownername->len))
4108		& LOCKOWNER_INO_HASH_MASK;
4109}
4110
4111/*
4112 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4113 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4114 * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4115 * locking, this prevents us from being completely protocol-compliant.  The
4116 * real solution to this problem is to start using unsigned file offsets in
4117 * the VFS, but this is a very deep change!
4118 */
4119static inline void
4120nfs4_transform_lock_offset(struct file_lock *lock)
4121{
4122	if (lock->fl_start < 0)
4123		lock->fl_start = OFFSET_MAX;
4124	if (lock->fl_end < 0)
4125		lock->fl_end = OFFSET_MAX;
4126}
4127
4128/* Hack!: For now, we're defining this just so we can use a pointer to it
4129 * as a unique cookie to identify our (NFSv4's) posix locks. */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4130static const struct lock_manager_operations nfsd_posix_mng_ops  = {
 
 
 
 
 
 
4131};
4132
4133static inline void
4134nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4135{
4136	struct nfs4_lockowner *lo;
4137
4138	if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4139		lo = (struct nfs4_lockowner *) fl->fl_owner;
4140		deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4141					lo->lo_owner.so_owner.len, GFP_KERNEL);
4142		if (!deny->ld_owner.data)
4143			/* We just don't care that much */
4144			goto nevermind;
4145		deny->ld_owner.len = lo->lo_owner.so_owner.len;
4146		deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4147	} else {
4148nevermind:
4149		deny->ld_owner.len = 0;
4150		deny->ld_owner.data = NULL;
4151		deny->ld_clientid.cl_boot = 0;
4152		deny->ld_clientid.cl_id = 0;
4153	}
4154	deny->ld_start = fl->fl_start;
4155	deny->ld_length = NFS4_MAX_UINT64;
4156	if (fl->fl_end != NFS4_MAX_UINT64)
4157		deny->ld_length = fl->fl_end - fl->fl_start + 1;        
4158	deny->ld_type = NFS4_READ_LT;
4159	if (fl->fl_type != F_RDLCK)
4160		deny->ld_type = NFS4_WRITE_LT;
4161}
4162
4163static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
 
4164{
4165	struct nfs4_ol_stateid *lst;
 
4166
4167	if (!same_owner_str(&lo->lo_owner, owner, clid))
4168		return false;
4169	if (list_empty(&lo->lo_owner.so_stateids)) {
4170		WARN_ON_ONCE(1);
4171		return false;
 
 
 
4172	}
4173	lst = list_first_entry(&lo->lo_owner.so_stateids,
4174			       struct nfs4_ol_stateid, st_perstateowner);
4175	return lst->st_file->fi_inode == inode;
4176}
4177
4178static struct nfs4_lockowner *
4179find_lockowner_str(struct inode *inode, clientid_t *clid,
4180		   struct xdr_netobj *owner, struct nfsd_net *nn)
4181{
4182	unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4183	struct nfs4_lockowner *lo;
4184
4185	list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4186		if (same_lockowner_ino(lo, inode, clid, owner))
4187			return lo;
4188	}
4189	return NULL;
4190}
4191
4192static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4193{
4194	struct inode *inode = open_stp->st_file->fi_inode;
4195	unsigned int inohash = lockowner_ino_hashval(inode,
4196			clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4197	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4198
4199	list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4200	list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4201	list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
 
 
4202}
4203
 
 
 
 
 
4204/*
4205 * Alloc a lock owner structure.
4206 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
4207 * occurred. 
4208 *
4209 * strhashval = ownerstr_hashval
4210 */
4211
4212static struct nfs4_lockowner *
4213alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4214	struct nfs4_lockowner *lo;
 
 
 
4215
4216	lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4217	if (!lo)
4218		return NULL;
 
4219	INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4220	lo->lo_owner.so_is_open_owner = 0;
4221	/* It is the openowner seqid that will be incremented in encode in the
4222	 * case of new lockowners; so increment the lock seqid manually: */
4223	lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4224	hash_lockowner(lo, strhashval, clp, open_stp);
4225	return lo;
 
 
 
 
 
 
 
 
4226}
4227
4228static struct nfs4_ol_stateid *
4229alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4230{
4231	struct nfs4_ol_stateid *stp;
4232	struct nfs4_client *clp = lo->lo_owner.so_client;
 
4233
4234	stp = nfs4_alloc_stateid(clp);
4235	if (stp == NULL)
4236		return NULL;
4237	stp->st_stid.sc_type = NFS4_LOCK_STID;
4238	list_add(&stp->st_perfile, &fp->fi_stateids);
4239	list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4240	stp->st_stateowner = &lo->lo_owner;
 
 
 
 
 
4241	get_nfs4_file(fp);
4242	stp->st_file = fp;
4243	stp->st_access_bmap = 0;
4244	stp->st_deny_bmap = open_stp->st_deny_bmap;
4245	stp->st_openstp = open_stp;
 
 
 
 
 
 
4246	return stp;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4247}
4248
4249static int
4250check_lock_length(u64 offset, u64 length)
4251{
4252	return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4253	     LOFF_OVERFLOW(offset, length)));
4254}
4255
4256static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4257{
4258	struct nfs4_file *fp = lock_stp->st_file;
4259	int oflag = nfs4_access_to_omode(access);
 
4260
4261	if (test_access(access, lock_stp))
4262		return;
4263	nfs4_file_get_access(fp, oflag);
4264	set_access(access, lock_stp);
4265}
4266
4267static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
 
 
 
 
4268{
4269	struct nfs4_file *fi = ost->st_file;
 
4270	struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4271	struct nfs4_client *cl = oo->oo_owner.so_client;
 
4272	struct nfs4_lockowner *lo;
 
4273	unsigned int strhashval;
4274	struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4275
4276	lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4277				&lock->v.new.owner, nn);
4278	if (lo) {
4279		if (!cstate->minorversion)
4280			return nfserr_bad_seqid;
4281		/* XXX: a lockowner always has exactly one stateid: */
4282		*lst = list_first_entry(&lo->lo_owner.so_stateids,
4283				struct nfs4_ol_stateid, st_perstateowner);
4284		return nfs_ok;
 
 
 
4285	}
4286	strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4287			&lock->v.new.owner);
4288	lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4289	if (lo == NULL)
4290		return nfserr_jukebox;
4291	*lst = alloc_init_lock_stateid(lo, fi, ost);
4292	if (*lst == NULL) {
4293		release_lockowner(lo);
4294		return nfserr_jukebox;
4295	}
4296	*new = true;
4297	return nfs_ok;
 
 
 
 
4298}
4299
4300/*
4301 *  LOCK operation 
4302 */
4303__be32
4304nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4305	   struct nfsd4_lock *lock)
4306{
 
4307	struct nfs4_openowner *open_sop = NULL;
4308	struct nfs4_lockowner *lock_sop = NULL;
4309	struct nfs4_ol_stateid *lock_stp;
4310	struct file *filp = NULL;
 
 
 
4311	struct file_lock *file_lock = NULL;
4312	struct file_lock *conflock = NULL;
 
4313	__be32 status = 0;
4314	bool new_state = false;
4315	int lkflg;
4316	int err;
 
 
 
4317	struct net *net = SVC_NET(rqstp);
4318	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4319
4320	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4321		(long long) lock->lk_offset,
4322		(long long) lock->lk_length);
4323
4324	if (check_lock_length(lock->lk_offset, lock->lk_length))
4325		 return nfserr_inval;
4326
4327	if ((status = fh_verify(rqstp, &cstate->current_fh,
4328				S_IFREG, NFSD_MAY_LOCK))) {
4329		dprintk("NFSD: nfsd4_lock: permission denied!\n");
4330		return status;
4331	}
4332
4333	nfs4_lock_state();
4334
4335	if (lock->lk_is_new) {
4336		struct nfs4_ol_stateid *open_stp = NULL;
4337
4338		if (nfsd4_has_session(cstate))
4339			/* See rfc 5661 18.10.3: given clientid is ignored: */
4340			memcpy(&lock->v.new.clientid,
4341				&cstate->session->se_client->cl_clientid,
4342				sizeof(clientid_t));
4343
4344		status = nfserr_stale_clientid;
4345		if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4346			goto out;
4347
4348		/* validate and update open stateid and open seqid */
4349		status = nfs4_preprocess_confirmed_seqid_op(cstate,
4350				        lock->lk_new_open_seqid,
4351		                        &lock->lk_new_open_stateid,
4352					&open_stp, nn);
4353		if (status)
4354			goto out;
 
4355		open_sop = openowner(open_stp->st_stateowner);
4356		status = nfserr_bad_stateid;
4357		if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4358						&lock->v.new.clientid))
4359			goto out;
4360		status = lookup_or_create_lock_state(cstate, open_stp, lock,
4361							&lock_stp, &new_state);
4362	} else
4363		status = nfs4_preprocess_seqid_op(cstate,
4364				       lock->lk_old_lock_seqid,
4365				       &lock->lk_old_lock_stateid,
4366				       NFS4_LOCK_STID, &lock_stp, nn);
 
 
4367	if (status)
4368		goto out;
4369	lock_sop = lockowner(lock_stp->st_stateowner);
4370
4371	lkflg = setlkflg(lock->lk_type);
4372	status = nfs4_check_openmode(lock_stp, lkflg);
4373	if (status)
4374		goto out;
4375
4376	status = nfserr_grace;
4377	if (locks_in_grace(net) && !lock->lk_reclaim)
4378		goto out;
4379	status = nfserr_no_grace;
4380	if (!locks_in_grace(net) && lock->lk_reclaim)
4381		goto out;
4382
4383	file_lock = locks_alloc_lock();
4384	if (!file_lock) {
4385		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4386		status = nfserr_jukebox;
4387		goto out;
4388	}
4389
4390	locks_init_lock(file_lock);
4391	switch (lock->lk_type) {
4392		case NFS4_READ_LT:
4393		case NFS4_READW_LT:
4394			filp = find_readable_file(lock_stp->st_file);
4395			if (filp)
 
 
 
4396				get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4397			file_lock->fl_type = F_RDLCK;
 
4398			break;
4399		case NFS4_WRITE_LT:
4400		case NFS4_WRITEW_LT:
4401			filp = find_writeable_file(lock_stp->st_file);
4402			if (filp)
 
 
 
4403				get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4404			file_lock->fl_type = F_WRLCK;
 
4405			break;
4406		default:
4407			status = nfserr_inval;
4408		goto out;
4409	}
4410	if (!filp) {
 
4411		status = nfserr_openmode;
4412		goto out;
4413	}
4414	file_lock->fl_owner = (fl_owner_t)lock_sop;
4415	file_lock->fl_pid = current->tgid;
4416	file_lock->fl_file = filp;
4417	file_lock->fl_flags = FL_POSIX;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4418	file_lock->fl_lmops = &nfsd_posix_mng_ops;
4419	file_lock->fl_start = lock->lk_offset;
4420	file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4421	nfs4_transform_lock_offset(file_lock);
4422
4423	conflock = locks_alloc_lock();
4424	if (!conflock) {
4425		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4426		status = nfserr_jukebox;
4427		goto out;
4428	}
4429
4430	err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4431	switch (-err) {
 
 
 
 
 
 
 
 
 
4432	case 0: /* success! */
4433		update_stateid(&lock_stp->st_stid.sc_stateid);
4434		memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid, 
4435				sizeof(stateid_t));
4436		status = 0;
 
 
4437		break;
4438	case (EAGAIN):		/* conflock holds conflicting lock */
 
 
 
 
4439		status = nfserr_denied;
4440		dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4441		nfs4_set_lock_denied(conflock, &lock->lk_denied);
4442		break;
4443	case (EDEADLK):
4444		status = nfserr_deadlock;
4445		break;
4446	default:
4447		dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4448		status = nfserrno(err);
4449		break;
4450	}
4451out:
4452	if (status && new_state)
4453		release_lockowner(lock_sop);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4454	nfsd4_bump_seqid(cstate, status);
4455	if (!cstate->replay_owner)
4456		nfs4_unlock_state();
4457	if (file_lock)
4458		locks_free_lock(file_lock);
4459	if (conflock)
4460		locks_free_lock(conflock);
4461	return status;
4462}
4463
 
 
 
 
 
 
 
 
4464/*
4465 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4466 * so we do a temporary open here just to get an open file to pass to
4467 * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4468 * inode operation.)
4469 */
4470static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4471{
4472	struct file *file;
4473	__be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4474	if (!err) {
4475		err = nfserrno(vfs_test_lock(file, lock));
4476		nfsd_close(file);
4477	}
 
 
 
 
 
 
 
 
 
 
 
 
4478	return err;
4479}
4480
4481/*
4482 * LOCKT operation
4483 */
4484__be32
4485nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4486	    struct nfsd4_lockt *lockt)
4487{
4488	struct inode *inode;
4489	struct file_lock *file_lock = NULL;
4490	struct nfs4_lockowner *lo;
4491	__be32 status;
4492	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4493
4494	if (locks_in_grace(SVC_NET(rqstp)))
4495		return nfserr_grace;
4496
4497	if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4498		 return nfserr_inval;
4499
4500	nfs4_lock_state();
4501
4502	if (!nfsd4_has_session(cstate)) {
4503		status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4504		if (status)
4505			goto out;
4506	}
4507
4508	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4509		goto out;
4510
4511	inode = cstate->current_fh.fh_dentry->d_inode;
4512	file_lock = locks_alloc_lock();
4513	if (!file_lock) {
4514		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4515		status = nfserr_jukebox;
4516		goto out;
4517	}
4518	locks_init_lock(file_lock);
4519	switch (lockt->lt_type) {
4520		case NFS4_READ_LT:
4521		case NFS4_READW_LT:
4522			file_lock->fl_type = F_RDLCK;
4523		break;
4524		case NFS4_WRITE_LT:
4525		case NFS4_WRITEW_LT:
4526			file_lock->fl_type = F_WRLCK;
4527		break;
4528		default:
4529			dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4530			status = nfserr_inval;
4531		goto out;
4532	}
4533
4534	lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4535	if (lo)
4536		file_lock->fl_owner = (fl_owner_t)lo;
4537	file_lock->fl_pid = current->tgid;
4538	file_lock->fl_flags = FL_POSIX;
4539
4540	file_lock->fl_start = lockt->lt_offset;
4541	file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4542
4543	nfs4_transform_lock_offset(file_lock);
4544
4545	status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4546	if (status)
4547		goto out;
4548
4549	if (file_lock->fl_type != F_UNLCK) {
4550		status = nfserr_denied;
4551		nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4552	}
4553out:
4554	nfs4_unlock_state();
 
4555	if (file_lock)
4556		locks_free_lock(file_lock);
4557	return status;
4558}
4559
 
 
 
 
 
 
 
 
4560__be32
4561nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4562	    struct nfsd4_locku *locku)
4563{
 
4564	struct nfs4_ol_stateid *stp;
4565	struct file *filp = NULL;
4566	struct file_lock *file_lock = NULL;
4567	__be32 status;
4568	int err;
4569	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4570
4571	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4572		(long long) locku->lu_offset,
4573		(long long) locku->lu_length);
4574
4575	if (check_lock_length(locku->lu_offset, locku->lu_length))
4576		 return nfserr_inval;
4577
4578	nfs4_lock_state();
4579									        
4580	status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4581					&locku->lu_stateid, NFS4_LOCK_STID,
4582					&stp, nn);
4583	if (status)
4584		goto out;
4585	filp = find_any_file(stp->st_file);
4586	if (!filp) {
4587		status = nfserr_lock_range;
4588		goto out;
4589	}
4590	file_lock = locks_alloc_lock();
4591	if (!file_lock) {
4592		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4593		status = nfserr_jukebox;
4594		goto out;
4595	}
4596	locks_init_lock(file_lock);
4597	file_lock->fl_type = F_UNLCK;
4598	file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4599	file_lock->fl_pid = current->tgid;
4600	file_lock->fl_file = filp;
4601	file_lock->fl_flags = FL_POSIX;
4602	file_lock->fl_lmops = &nfsd_posix_mng_ops;
4603	file_lock->fl_start = locku->lu_offset;
4604
4605	file_lock->fl_end = last_byte_offset(locku->lu_offset,
4606						locku->lu_length);
4607	nfs4_transform_lock_offset(file_lock);
4608
4609	err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4610	if (err) {
4611		dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4612		goto out_nfserr;
4613	}
4614	update_stateid(&stp->st_stid.sc_stateid);
4615	memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4616
 
 
 
4617out:
4618	nfsd4_bump_seqid(cstate, status);
4619	if (!cstate->replay_owner)
4620		nfs4_unlock_state();
4621	if (file_lock)
4622		locks_free_lock(file_lock);
4623	return status;
4624
4625out_nfserr:
4626	status = nfserrno(err);
4627	goto out;
4628}
4629
4630/*
4631 * returns
4632 * 	1: locks held by lockowner
4633 * 	0: no locks held by lockowner
4634 */
4635static int
4636check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4637{
4638	struct file_lock **flpp;
4639	struct inode *inode = filp->fi_inode;
4640	int status = 0;
 
 
4641
4642	spin_lock(&inode->i_lock);
4643	for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4644		if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4645			status = 1;
4646			goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 
4647		}
 
4648	}
4649out:
4650	spin_unlock(&inode->i_lock);
4651	return status;
4652}
4653
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4654__be32
4655nfsd4_release_lockowner(struct svc_rqst *rqstp,
4656			struct nfsd4_compound_state *cstate,
4657			struct nfsd4_release_lockowner *rlockowner)
4658{
 
 
4659	clientid_t *clid = &rlockowner->rl_clientid;
4660	struct nfs4_stateowner *sop;
4661	struct nfs4_lockowner *lo;
4662	struct nfs4_ol_stateid *stp;
4663	struct xdr_netobj *owner = &rlockowner->rl_owner;
4664	struct list_head matches;
4665	unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4666	__be32 status;
4667	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4668
4669	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4670		clid->cl_boot, clid->cl_id);
4671
4672	nfs4_lock_state();
4673
4674	status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4675	if (status)
4676		goto out;
 
4677
4678	status = nfserr_locks_held;
4679	INIT_LIST_HEAD(&matches);
 
 
 
 
4680
4681	list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4682		if (sop->so_is_open_owner)
4683			continue;
4684		if (!same_owner_str(sop, owner, clid))
4685			continue;
4686		list_for_each_entry(stp, &sop->so_stateids,
4687				st_perstateowner) {
4688			lo = lockowner(sop);
4689			if (check_for_locks(stp->st_file, lo))
4690				goto out;
4691			list_add(&lo->lo_list, &matches);
4692		}
4693	}
4694	/* Clients probably won't expect us to return with some (but not all)
4695	 * of the lockowner state released; so don't release any until all
4696	 * have been checked. */
4697	status = nfs_ok;
4698	while (!list_empty(&matches)) {
4699		lo = list_entry(matches.next, struct nfs4_lockowner,
4700								lo_list);
4701		/* unhash_stateowner deletes so_perclient only
4702		 * for openowners. */
4703		list_del(&lo->lo_list);
4704		release_lockowner(lo);
4705	}
4706out:
4707	nfs4_unlock_state();
4708	return status;
 
 
 
4709}
4710
4711static inline struct nfs4_client_reclaim *
4712alloc_reclaim(void)
4713{
4714	return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4715}
4716
4717bool
4718nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4719{
4720	struct nfs4_client_reclaim *crp;
4721
4722	crp = nfsd4_find_reclaim_client(name, nn);
4723	return (crp && crp->cr_clp);
4724}
4725
4726/*
4727 * failure => all reset bets are off, nfserr_no_grace...
 
 
 
4728 */
4729struct nfs4_client_reclaim *
4730nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
 
4731{
4732	unsigned int strhashval;
4733	struct nfs4_client_reclaim *crp;
4734
4735	dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4736	crp = alloc_reclaim();
4737	if (crp) {
4738		strhashval = clientstr_hashval(name);
4739		INIT_LIST_HEAD(&crp->cr_strhash);
4740		list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4741		memcpy(crp->cr_recdir, name, HEXDIR_LEN);
 
 
 
4742		crp->cr_clp = NULL;
4743		nn->reclaim_str_hashtbl_size++;
4744	}
4745	return crp;
4746}
4747
4748void
4749nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4750{
4751	list_del(&crp->cr_strhash);
 
 
4752	kfree(crp);
4753	nn->reclaim_str_hashtbl_size--;
4754}
4755
4756void
4757nfs4_release_reclaim(struct nfsd_net *nn)
4758{
4759	struct nfs4_client_reclaim *crp = NULL;
4760	int i;
4761
4762	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4763		while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4764			crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4765			                struct nfs4_client_reclaim, cr_strhash);
4766			nfs4_remove_reclaim_record(crp, nn);
4767		}
4768	}
4769	WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4770}
4771
4772/*
4773 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4774struct nfs4_client_reclaim *
4775nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4776{
4777	unsigned int strhashval;
4778	struct nfs4_client_reclaim *crp = NULL;
4779
4780	dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4781
4782	strhashval = clientstr_hashval(recdir);
4783	list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4784		if (same_name(crp->cr_recdir, recdir)) {
4785			return crp;
4786		}
4787	}
4788	return NULL;
4789}
4790
4791/*
4792* Called from OPEN. Look for clientid in reclaim list.
4793*/
4794__be32
4795nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4796{
4797	struct nfs4_client *clp;
 
4798
4799	/* find clientid in conf_id_hashtbl */
4800	clp = find_confirmed_client(clid, sessions, nn);
4801	if (clp == NULL)
4802		return nfserr_reclaim_bad;
4803
4804	return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4805}
4806
4807#ifdef CONFIG_NFSD_FAULT_INJECTION
4808
4809u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4810{
4811	if (mark_client_expired(clp))
4812		return 0;
4813	expire_client(clp);
4814	return 1;
4815}
4816
4817u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4818{
4819	char buf[INET6_ADDRSTRLEN];
4820	rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4821	printk(KERN_INFO "NFS Client: %s\n", buf);
4822	return 1;
4823}
4824
4825static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4826			     const char *type)
4827{
4828	char buf[INET6_ADDRSTRLEN];
4829	rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4830	printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4831}
4832
4833static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4834{
4835	struct nfs4_openowner *oop;
4836	struct nfs4_lockowner *lop, *lo_next;
4837	struct nfs4_ol_stateid *stp, *st_next;
4838	u64 count = 0;
4839
4840	list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4841		list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4842			list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4843				if (func)
4844					func(lop);
4845				if (++count == max)
4846					return count;
4847			}
4848		}
4849	}
4850
4851	return count;
4852}
4853
4854u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4855{
4856	return nfsd_foreach_client_lock(clp, max, release_lockowner);
4857}
4858
4859u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4860{
4861	u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4862	nfsd_print_count(clp, count, "locked files");
4863	return count;
4864}
4865
4866static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4867{
4868	struct nfs4_openowner *oop, *next;
4869	u64 count = 0;
4870
4871	list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4872		if (func)
4873			func(oop);
4874		if (++count == max)
4875			break;
4876	}
4877
4878	return count;
4879}
4880
4881u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4882{
4883	return nfsd_foreach_client_open(clp, max, release_openowner);
4884}
4885
4886u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4887{
4888	u64 count = nfsd_foreach_client_open(clp, max, NULL);
4889	nfsd_print_count(clp, count, "open files");
4890	return count;
4891}
4892
4893static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4894				     struct list_head *victims)
4895{
4896	struct nfs4_delegation *dp, *next;
4897	u64 count = 0;
4898
4899	list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4900		if (victims)
4901			list_move(&dp->dl_recall_lru, victims);
4902		if (++count == max)
4903			break;
4904	}
4905	return count;
4906}
4907
4908u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4909{
4910	struct nfs4_delegation *dp, *next;
4911	LIST_HEAD(victims);
4912	u64 count;
4913
4914	spin_lock(&recall_lock);
4915	count = nfsd_find_all_delegations(clp, max, &victims);
4916	spin_unlock(&recall_lock);
4917
4918	list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4919		revoke_delegation(dp);
4920
4921	return count;
4922}
4923
4924u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4925{
4926	struct nfs4_delegation *dp, *next;
4927	LIST_HEAD(victims);
4928	u64 count;
4929
4930	spin_lock(&recall_lock);
4931	count = nfsd_find_all_delegations(clp, max, &victims);
4932	list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4933		nfsd_break_one_deleg(dp);
4934	spin_unlock(&recall_lock);
4935
4936	return count;
4937}
4938
4939u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4940{
4941	u64 count = 0;
4942
4943	spin_lock(&recall_lock);
4944	count = nfsd_find_all_delegations(clp, max, NULL);
4945	spin_unlock(&recall_lock);
4946
4947	nfsd_print_count(clp, count, "delegations");
4948	return count;
4949}
4950
4951u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4952{
4953	struct nfs4_client *clp, *next;
4954	u64 count = 0;
4955	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4956
4957	if (!nfsd_netns_ready(nn))
4958		return 0;
4959
4960	list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4961		count += func(clp, max - count);
4962		if ((max != 0) && (count >= max))
4963			break;
4964	}
4965
4966	return count;
4967}
4968
4969struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4970{
4971	struct nfs4_client *clp;
4972	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4973
4974	if (!nfsd_netns_ready(nn))
4975		return NULL;
4976
4977	list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4978		if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4979			return clp;
4980	}
4981	return NULL;
4982}
4983
4984#endif /* CONFIG_NFSD_FAULT_INJECTION */
4985
4986/* initialization to perform at module load time: */
4987
4988void
4989nfs4_state_init(void)
4990{
4991}
4992
4993/*
4994 * Since the lifetime of a delegation isn't limited to that of an open, a
4995 * client may quite reasonably hang on to a delegation as long as it has
4996 * the inode cached.  This becomes an obvious problem the first time a
4997 * client's inode cache approaches the size of the server's total memory.
4998 *
4999 * For now we avoid this problem by imposing a hard limit on the number
5000 * of delegations, which varies according to the server's memory size.
5001 */
5002static void
5003set_max_delegations(void)
5004{
5005	/*
5006	 * Allow at most 4 delegations per megabyte of RAM.  Quick
5007	 * estimates suggest that in the worst case (where every delegation
5008	 * is for a different inode), a delegation could take about 1.5K,
5009	 * giving a worst case usage of about 6% of memory.
5010	 */
5011	max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5012}
5013
5014static int nfs4_state_create_net(struct net *net)
5015{
5016	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5017	int i;
5018
5019	nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5020			CLIENT_HASH_SIZE, GFP_KERNEL);
 
5021	if (!nn->conf_id_hashtbl)
5022		goto err;
5023	nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5024			CLIENT_HASH_SIZE, GFP_KERNEL);
 
5025	if (!nn->unconf_id_hashtbl)
5026		goto err_unconf_id;
5027	nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5028			OWNER_HASH_SIZE, GFP_KERNEL);
5029	if (!nn->ownerstr_hashtbl)
5030		goto err_ownerstr;
5031	nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5032			LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5033	if (!nn->lockowner_ino_hashtbl)
5034		goto err_lockowner_ino;
5035	nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5036			SESSION_HASH_SIZE, GFP_KERNEL);
5037	if (!nn->sessionid_hashtbl)
5038		goto err_sessionid;
5039
5040	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5041		INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5042		INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5043	}
5044	for (i = 0; i < OWNER_HASH_SIZE; i++)
5045		INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5046	for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5047		INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5048	for (i = 0; i < SESSION_HASH_SIZE; i++)
5049		INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5050	nn->conf_name_tree = RB_ROOT;
5051	nn->unconf_name_tree = RB_ROOT;
 
 
 
 
5052	INIT_LIST_HEAD(&nn->client_lru);
5053	INIT_LIST_HEAD(&nn->close_lru);
5054	INIT_LIST_HEAD(&nn->del_recall_lru);
5055	spin_lock_init(&nn->client_lock);
 
 
 
 
 
 
5056
5057	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
 
5058	get_net(net);
5059
 
 
 
 
 
 
 
 
 
 
5060	return 0;
5061
 
 
 
5062err_sessionid:
5063	kfree(nn->lockowner_ino_hashtbl);
5064err_lockowner_ino:
5065	kfree(nn->ownerstr_hashtbl);
5066err_ownerstr:
5067	kfree(nn->unconf_id_hashtbl);
5068err_unconf_id:
5069	kfree(nn->conf_id_hashtbl);
5070err:
5071	return -ENOMEM;
5072}
5073
5074static void
5075nfs4_state_destroy_net(struct net *net)
5076{
5077	int i;
5078	struct nfs4_client *clp = NULL;
5079	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5080
5081	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5082		while (!list_empty(&nn->conf_id_hashtbl[i])) {
5083			clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5084			destroy_client(clp);
5085		}
5086	}
5087
 
 
5088	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5089		while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5090			clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5091			destroy_client(clp);
5092		}
5093	}
5094
5095	kfree(nn->sessionid_hashtbl);
5096	kfree(nn->lockowner_ino_hashtbl);
5097	kfree(nn->ownerstr_hashtbl);
5098	kfree(nn->unconf_id_hashtbl);
5099	kfree(nn->conf_id_hashtbl);
5100	put_net(net);
5101}
5102
5103int
5104nfs4_state_start_net(struct net *net)
5105{
5106	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5107	int ret;
5108
5109	ret = nfs4_state_create_net(net);
5110	if (ret)
5111		return ret;
5112	nfsd4_client_tracking_init(net);
5113	nn->boot_time = get_seconds();
5114	locks_start_grace(net, &nn->nfsd4_manager);
5115	nn->grace_ended = false;
5116	printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5117	       nn->nfsd4_grace, net);
 
 
 
5118	queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5119	return 0;
 
 
 
 
 
 
 
5120}
5121
5122/* initialization to perform when the nfsd service is started: */
5123
5124int
5125nfs4_state_start(void)
5126{
5127	int ret;
5128
5129	ret = set_callback_cred();
5130	if (ret)
5131		return -ENOMEM;
5132	laundry_wq = create_singlethread_workqueue("nfsd4");
5133	if (laundry_wq == NULL) {
5134		ret = -ENOMEM;
5135		goto out_recovery;
5136	}
5137	ret = nfsd4_create_callback_queue();
5138	if (ret)
5139		goto out_free_laundry;
5140
5141	set_max_delegations();
5142
5143	return 0;
5144
5145out_free_laundry:
5146	destroy_workqueue(laundry_wq);
5147out_recovery:
5148	return ret;
5149}
5150
5151void
5152nfs4_state_shutdown_net(struct net *net)
5153{
5154	struct nfs4_delegation *dp = NULL;
5155	struct list_head *pos, *next, reaplist;
5156	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5157
 
 
5158	cancel_delayed_work_sync(&nn->laundromat_work);
5159	locks_end_grace(&nn->nfsd4_manager);
5160
5161	nfs4_lock_state();
5162	INIT_LIST_HEAD(&reaplist);
5163	spin_lock(&recall_lock);
5164	list_for_each_safe(pos, next, &nn->del_recall_lru) {
5165		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5166		list_move(&dp->dl_recall_lru, &reaplist);
 
5167	}
5168	spin_unlock(&recall_lock);
5169	list_for_each_safe(pos, next, &reaplist) {
5170		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5171		destroy_delegation(dp);
 
5172	}
5173
5174	nfsd4_client_tracking_exit(net);
5175	nfs4_state_destroy_net(net);
5176	nfs4_unlock_state();
 
 
5177}
5178
5179void
5180nfs4_state_shutdown(void)
5181{
5182	destroy_workqueue(laundry_wq);
5183	nfsd4_destroy_callback_queue();
5184}
5185
5186static void
5187get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5188{
5189	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
 
5190		memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5191}
5192
5193static void
5194put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5195{
5196	if (cstate->minorversion) {
5197		memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5198		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5199	}
5200}
5201
5202void
5203clear_current_stateid(struct nfsd4_compound_state *cstate)
5204{
5205	CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5206}
5207
5208/*
5209 * functions to set current state id
5210 */
5211void
5212nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
 
5213{
5214	put_stateid(cstate, &odp->od_stateid);
5215}
5216
5217void
5218nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 
5219{
5220	put_stateid(cstate, &open->op_stateid);
5221}
5222
5223void
5224nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
 
5225{
5226	put_stateid(cstate, &close->cl_stateid);
5227}
5228
5229void
5230nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
 
5231{
5232	put_stateid(cstate, &lock->lk_resp_stateid);
5233}
5234
5235/*
5236 * functions to consume current state id
5237 */
5238
5239void
5240nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
 
5241{
5242	get_stateid(cstate, &odp->od_stateid);
5243}
5244
5245void
5246nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
 
5247{
5248	get_stateid(cstate, &drp->dr_stateid);
5249}
5250
5251void
5252nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
 
5253{
5254	get_stateid(cstate, &fsp->fr_stateid);
5255}
5256
5257void
5258nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
 
5259{
5260	get_stateid(cstate, &setattr->sa_stateid);
5261}
5262
5263void
5264nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
 
5265{
5266	get_stateid(cstate, &close->cl_stateid);
5267}
5268
5269void
5270nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
 
5271{
5272	get_stateid(cstate, &locku->lu_stateid);
5273}
5274
5275void
5276nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
 
5277{
5278	get_stateid(cstate, &read->rd_stateid);
5279}
5280
5281void
5282nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5283{
5284	get_stateid(cstate, &write->wr_stateid);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5285}