fs/nfsd/nfs4state.c

   1 /*
   2 *  Copyright (c) 2001 The Regents of the University of Michigan.
   3 *  All rights reserved.
   4 *
   5 *  Kendrick Smith <kmsmith@umich.edu>
   6 *  Andy Adamson <kandros@umich.edu>
   7 *
   8 *  Redistribution and use in source and binary forms, with or without
   9 *  modification, are permitted provided that the following conditions
  10 *  are met:
  11 *
  12 *  1. Redistributions of source code must retain the above copyright
  13 *     notice, this list of conditions and the following disclaimer.
  14 *  2. Redistributions in binary form must reproduce the above copyright
  15 *     notice, this list of conditions and the following disclaimer in the
  16 *     documentation and/or other materials provided with the distribution.
  17 *  3. Neither the name of the University nor the names of its
  18 *     contributors may be used to endorse or promote products derived
  19 *     from this software without specific prior written permission.
  20 *
  21 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 *
  33 */
  34
  35 #include <linux/file.h>
  36 #include <linux/fs.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/swap.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/ratelimit.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include "xdr4.h"
  45 #include "vfs.h"
  46 #include "current_stateid.h"
  47 #include "fault_inject.h"
  48
  49 #include "netns.h"
  50
  51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  52
  53 /* Globals */
  54 time_t nfsd4_lease = 90;     /* default lease time */
  55 time_t nfsd4_grace = 90;
  56
  57 #define all_ones {{~0,~0},~0}
  58 static const stateid_t one_stateid = {
  59         .si_generation = ~0,
  60         .si_opaque = all_ones,
  61 };
  62 static const stateid_t zero_stateid = {
  63         /* all fields zero */
  64 };
  65 static const stateid_t currentstateid = {
  66         .si_generation = 1,
  67 };
  68
  69 static u64 current_sessionid = 1;
  70
  71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  72 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  73 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  74
  75 /* forward declarations */
  76 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  77
  78 /* Locking: */
  79
  80 /* Currently used for almost all code touching nfsv4 state: */
  81 static DEFINE_MUTEX(client_mutex);
  82
  83 /*
  84  * Currently used for the del_recall_lru and file hash table.  In an
  85  * effort to decrease the scope of the client_mutex, this spinlock may
  86  * eventually cover more:
  87  */
  88 static DEFINE_SPINLOCK(recall_lock);
  89
  90 static struct kmem_cache *openowner_slab = NULL;
  91 static struct kmem_cache *lockowner_slab = NULL;
  92 static struct kmem_cache *file_slab = NULL;
  93 static struct kmem_cache *stateid_slab = NULL;
  94 static struct kmem_cache *deleg_slab = NULL;
  95
  96 void
  97 nfs4_lock_state(void)
  98 {
  99         mutex_lock(&client_mutex);
 100 }
 101
 102 static void free_session(struct kref *);
 103
 104 /* Must be called under the client_lock */
 105 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 106 {
 107         kref_put(&ses->se_ref, free_session);
 108 }
 109
 110 static void nfsd4_get_session(struct nfsd4_session *ses)
 111 {
 112         kref_get(&ses->se_ref);
 113 }
 114
 115 void
 116 nfs4_unlock_state(void)
 117 {
 118         mutex_unlock(&client_mutex);
 119 }
 120
 121 static inline u32
 122 opaque_hashval(const void *ptr, int nbytes)
 123 {
 124         unsigned char *cptr = (unsigned char *) ptr;
 125
 126         u32 x = 0;
 127         while (nbytes--) {
 128                 x *= 37;
 129                 x += *cptr++;
 130         }
 131         return x;
 132 }
 133
 134 static struct list_head del_recall_lru;
 135
 136 static void nfsd4_free_file(struct nfs4_file *f)
 137 {
 138         kmem_cache_free(file_slab, f);
 139 }
 140
 141 static inline void
 142 put_nfs4_file(struct nfs4_file *fi)
 143 {
 144         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 145                 list_del(&fi->fi_hash);
 146                 spin_unlock(&recall_lock);
 147                 iput(fi->fi_inode);
 148                 nfsd4_free_file(fi);
 149         }
 150 }
 151
 152 static inline void
 153 get_nfs4_file(struct nfs4_file *fi)
 154 {
 155         atomic_inc(&fi->fi_ref);
 156 }
 157
 158 static int num_delegations;
 159 unsigned int max_delegations;
 160
 161 /*
 162  * Open owner state (share locks)
 163  */
 164
 165 /* hash tables for lock and open owners */
 166 #define OWNER_HASH_BITS              8
 167 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 168 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 169
 170 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 171 {
 172         unsigned int ret;
 173
 174         ret = opaque_hashval(ownername->data, ownername->len);
 175         ret += clientid;
 176         return ret & OWNER_HASH_MASK;
 177 }
 178
 179 /* hash table for nfs4_file */
 180 #define FILE_HASH_BITS                   8
 181 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 182
 183 static unsigned int file_hashval(struct inode *ino)
 184 {
 185         /* XXX: why are we hashing on inode pointer, anyway? */
 186         return hash_ptr(ino, FILE_HASH_BITS);
 187 }
 188
 189 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 190
 191 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 192 {
 193         BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 194         atomic_inc(&fp->fi_access[oflag]);
 195 }
 196
 197 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 198 {
 199         if (oflag == O_RDWR) {
 200                 __nfs4_file_get_access(fp, O_RDONLY);
 201                 __nfs4_file_get_access(fp, O_WRONLY);
 202         } else
 203                 __nfs4_file_get_access(fp, oflag);
 204 }
 205
 206 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 207 {
 208         if (fp->fi_fds[oflag]) {
 209                 fput(fp->fi_fds[oflag]);
 210                 fp->fi_fds[oflag] = NULL;
 211         }
 212 }
 213
 214 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 215 {
 216         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 217                 nfs4_file_put_fd(fp, oflag);
 218                 /*
 219                  * It's also safe to get rid of the RDWR open *if*
 220                  * we no longer have need of the other kind of access
 221                  * or if we already have the other kind of open:
 222                  */
 223                 if (fp->fi_fds[1-oflag]
 224                         || atomic_read(&fp->fi_access[1 - oflag]) == 0)
 225                         nfs4_file_put_fd(fp, O_RDWR);
 226         }
 227 }
 228
 229 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 230 {
 231         if (oflag == O_RDWR) {
 232                 __nfs4_file_put_access(fp, O_RDONLY);
 233                 __nfs4_file_put_access(fp, O_WRONLY);
 234         } else
 235                 __nfs4_file_put_access(fp, oflag);
 236 }
 237
 238 static inline int get_new_stid(struct nfs4_stid *stid)
 239 {
 240         static int min_stateid = 0;
 241         struct idr *stateids = &stid->sc_client->cl_stateids;
 242         int new_stid;
 243         int error;
 244
 245         error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
 246         /*
 247          * Note: the necessary preallocation was done in
 248          * nfs4_alloc_stateid().  The idr code caps the number of
 249          * preallocations that can exist at a time, but the state lock
 250          * prevents anyone from using ours before we get here:
 251          */
 252         BUG_ON(error);
 253         /*
 254          * It shouldn't be a problem to reuse an opaque stateid value.
 255          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 256          * example, a stray write retransmission could be accepted by
 257          * the server when it should have been rejected.  Therefore,
 258          * adopt a trick from the sctp code to attempt to maximize the
 259          * amount of time until an id is reused, by ensuring they always
 260          * "increase" (mod INT_MAX):
 261          */
 262
 263         min_stateid = new_stid+1;
 264         if (min_stateid == INT_MAX)
 265                 min_stateid = 0;
 266         return new_stid;
 267 }
 268
 269 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
 270 {
 271         stateid_t *s = &stid->sc_stateid;
 272         int new_id;
 273
 274         stid->sc_type = type;
 275         stid->sc_client = cl;
 276         s->si_opaque.so_clid = cl->cl_clientid;
 277         new_id = get_new_stid(stid);
 278         s->si_opaque.so_id = (u32)new_id;
 279         /* Will be incremented before return to client: */
 280         s->si_generation = 0;
 281 }
 282
 283 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
 284 {
 285         struct idr *stateids = &cl->cl_stateids;
 286
 287         if (!idr_pre_get(stateids, GFP_KERNEL))
 288                 return NULL;
 289         /*
 290          * Note: if we fail here (or any time between now and the time
 291          * we actually get the new idr), we won't need to undo the idr
 292          * preallocation, since the idr code caps the number of
 293          * preallocated entries.
 294          */
 295         return kmem_cache_alloc(slab, GFP_KERNEL);
 296 }
 297
 298 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 299 {
 300         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 301 }
 302
 303 static struct nfs4_delegation *
 304 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
 305 {
 306         struct nfs4_delegation *dp;
 307         struct nfs4_file *fp = stp->st_file;
 308
 309         dprintk("NFSD alloc_init_deleg\n");
 310         /*
 311          * Major work on the lease subsystem (for example, to support
 312          * calbacks on stat) will be required before we can support
 313          * write delegations properly.
 314          */
 315         if (type != NFS4_OPEN_DELEGATE_READ)
 316                 return NULL;
 317         if (fp->fi_had_conflict)
 318                 return NULL;
 319         if (num_delegations > max_delegations)
 320                 return NULL;
 321         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 322         if (dp == NULL)
 323                 return dp;
 324         init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
 325         /*
 326          * delegation seqid's are never incremented.  The 4.1 special
 327          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 328          * 0 anyway just for consistency and use 1:
 329          */
 330         dp->dl_stid.sc_stateid.si_generation = 1;
 331         num_delegations++;
 332         INIT_LIST_HEAD(&dp->dl_perfile);
 333         INIT_LIST_HEAD(&dp->dl_perclnt);
 334         INIT_LIST_HEAD(&dp->dl_recall_lru);
 335         get_nfs4_file(fp);
 336         dp->dl_file = fp;
 337         dp->dl_type = type;
 338         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 339         dp->dl_time = 0;
 340         atomic_set(&dp->dl_count, 1);
 341         nfsd4_init_callback(&dp->dl_recall);
 342         return dp;
 343 }
 344
 345 void
 346 nfs4_put_delegation(struct nfs4_delegation *dp)
 347 {
 348         if (atomic_dec_and_test(&dp->dl_count)) {
 349                 dprintk("NFSD: freeing dp %p\n",dp);
 350                 put_nfs4_file(dp->dl_file);
 351                 kmem_cache_free(deleg_slab, dp);
 352                 num_delegations--;
 353         }
 354 }
 355
 356 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 357 {
 358         if (atomic_dec_and_test(&fp->fi_delegees)) {
 359                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 360                 fp->fi_lease = NULL;
 361                 fput(fp->fi_deleg_file);
 362                 fp->fi_deleg_file = NULL;
 363         }
 364 }
 365
 366 static void unhash_stid(struct nfs4_stid *s)
 367 {
 368         struct idr *stateids = &s->sc_client->cl_stateids;
 369
 370         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 371 }
 372
 373 /* Called under the state lock. */
 374 static void
 375 unhash_delegation(struct nfs4_delegation *dp)
 376 {
 377         unhash_stid(&dp->dl_stid);
 378         list_del_init(&dp->dl_perclnt);
 379         spin_lock(&recall_lock);
 380         list_del_init(&dp->dl_perfile);
 381         list_del_init(&dp->dl_recall_lru);
 382         spin_unlock(&recall_lock);
 383         nfs4_put_deleg_lease(dp->dl_file);
 384         nfs4_put_delegation(dp);
 385 }
 386
 387 /*
 388  * SETCLIENTID state
 389  */
 390
 391 /* client_lock protects the client lru list and session hash table */
 392 static DEFINE_SPINLOCK(client_lock);
 393
 394 static unsigned int clientid_hashval(u32 id)
 395 {
 396         return id & CLIENT_HASH_MASK;
 397 }
 398
 399 static unsigned int clientstr_hashval(const char *name)
 400 {
 401         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 402 }
 403
 404 /*
 405  * client_lru holds client queue ordered by nfs4_client.cl_time
 406  * for lease renewal.
 407  *
 408  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 409  * for last close replay.
 410  *
 411  * All of the above fields are protected by the client_mutex.
 412  */
 413 static struct list_head client_lru;
 414 static struct list_head close_lru;
 415
 416 /*
 417  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 418  * st_{access,deny}_bmap field of the stateid, in order to track not
 419  * only what share bits are currently in force, but also what
 420  * combinations of share bits previous opens have used.  This allows us
 421  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 422  * return an error if the client attempt to downgrade to a combination
 423  * of share bits not explicable by closing some of its previous opens.
 424  *
 425  * XXX: This enforcement is actually incomplete, since we don't keep
 426  * track of access/deny bit combinations; so, e.g., we allow:
 427  *
 428  *      OPEN allow read, deny write
 429  *      OPEN allow both, deny none
 430  *      DOWNGRADE allow read, deny none
 431  *
 432  * which we should reject.
 433  */
 434 static unsigned int
 435 bmap_to_share_mode(unsigned long bmap) {
 436         int i;
 437         unsigned int access = 0;
 438
 439         for (i = 1; i < 4; i++) {
 440                 if (test_bit(i, &bmap))
 441                         access |= i;
 442         }
 443         return access;
 444 }
 445
 446 static bool
 447 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 448         unsigned int access, deny;
 449
 450         access = bmap_to_share_mode(stp->st_access_bmap);
 451         deny = bmap_to_share_mode(stp->st_deny_bmap);
 452         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 453                 return false;
 454         return true;
 455 }
 456
 457 /* set share access for a given stateid */
 458 static inline void
 459 set_access(u32 access, struct nfs4_ol_stateid *stp)
 460 {
 461         __set_bit(access, &stp->st_access_bmap);
 462 }
 463
 464 /* clear share access for a given stateid */
 465 static inline void
 466 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 467 {
 468         __clear_bit(access, &stp->st_access_bmap);
 469 }
 470
 471 /* test whether a given stateid has access */
 472 static inline bool
 473 test_access(u32 access, struct nfs4_ol_stateid *stp)
 474 {
 475         return test_bit(access, &stp->st_access_bmap);
 476 }
 477
 478 /* set share deny for a given stateid */
 479 static inline void
 480 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 481 {
 482         __set_bit(access, &stp->st_deny_bmap);
 483 }
 484
 485 /* clear share deny for a given stateid */
 486 static inline void
 487 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 488 {
 489         __clear_bit(access, &stp->st_deny_bmap);
 490 }
 491
 492 /* test whether a given stateid is denying specific access */
 493 static inline bool
 494 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 495 {
 496         return test_bit(access, &stp->st_deny_bmap);
 497 }
 498
 499 static int nfs4_access_to_omode(u32 access)
 500 {
 501         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 502         case NFS4_SHARE_ACCESS_READ:
 503                 return O_RDONLY;
 504         case NFS4_SHARE_ACCESS_WRITE:
 505                 return O_WRONLY;
 506         case NFS4_SHARE_ACCESS_BOTH:
 507                 return O_RDWR;
 508         }
 509         BUG();
 510 }
 511
 512 /* release all access and file references for a given stateid */
 513 static void
 514 release_all_access(struct nfs4_ol_stateid *stp)
 515 {
 516         int i;
 517
 518         for (i = 1; i < 4; i++) {
 519                 if (test_access(i, stp))
 520                         nfs4_file_put_access(stp->st_file,
 521                                              nfs4_access_to_omode(i));
 522                 clear_access(i, stp);
 523         }
 524 }
 525
 526 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 527 {
 528         list_del(&stp->st_perfile);
 529         list_del(&stp->st_perstateowner);
 530 }
 531
 532 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 533 {
 534         release_all_access(stp);
 535         put_nfs4_file(stp->st_file);
 536         stp->st_file = NULL;
 537 }
 538
 539 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 540 {
 541         kmem_cache_free(stateid_slab, stp);
 542 }
 543
 544 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 545 {
 546         struct file *file;
 547
 548         unhash_generic_stateid(stp);
 549         unhash_stid(&stp->st_stid);
 550         file = find_any_file(stp->st_file);
 551         if (file)
 552                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 553         close_generic_stateid(stp);
 554         free_generic_stateid(stp);
 555 }
 556
 557 static void unhash_lockowner(struct nfs4_lockowner *lo)
 558 {
 559         struct nfs4_ol_stateid *stp;
 560
 561         list_del(&lo->lo_owner.so_strhash);
 562         list_del(&lo->lo_perstateid);
 563         list_del(&lo->lo_owner_ino_hash);
 564         while (!list_empty(&lo->lo_owner.so_stateids)) {
 565                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 566                                 struct nfs4_ol_stateid, st_perstateowner);
 567                 release_lock_stateid(stp);
 568         }
 569 }
 570
 571 static void release_lockowner(struct nfs4_lockowner *lo)
 572 {
 573         unhash_lockowner(lo);
 574         nfs4_free_lockowner(lo);
 575 }
 576
 577 static void
 578 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 579 {
 580         struct nfs4_lockowner *lo;
 581
 582         while (!list_empty(&open_stp->st_lockowners)) {
 583                 lo = list_entry(open_stp->st_lockowners.next,
 584                                 struct nfs4_lockowner, lo_perstateid);
 585                 release_lockowner(lo);
 586         }
 587 }
 588
 589 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 590 {
 591         unhash_generic_stateid(stp);
 592         release_stateid_lockowners(stp);
 593         close_generic_stateid(stp);
 594 }
 595
 596 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 597 {
 598         unhash_open_stateid(stp);
 599         unhash_stid(&stp->st_stid);
 600         free_generic_stateid(stp);
 601 }
 602
 603 static void unhash_openowner(struct nfs4_openowner *oo)
 604 {
 605         struct nfs4_ol_stateid *stp;
 606
 607         list_del(&oo->oo_owner.so_strhash);
 608         list_del(&oo->oo_perclient);
 609         while (!list_empty(&oo->oo_owner.so_stateids)) {
 610                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 611                                 struct nfs4_ol_stateid, st_perstateowner);
 612                 release_open_stateid(stp);
 613         }
 614 }
 615
 616 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 617 {
 618         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 619
 620         if (s) {
 621                 unhash_stid(&s->st_stid);
 622                 free_generic_stateid(s);
 623                 oo->oo_last_closed_stid = NULL;
 624         }
 625 }
 626
 627 static void release_openowner(struct nfs4_openowner *oo)
 628 {
 629         unhash_openowner(oo);
 630         list_del(&oo->oo_close_lru);
 631         release_last_closed_stateid(oo);
 632         nfs4_free_openowner(oo);
 633 }
 634
 635 #define SESSION_HASH_SIZE       512
 636 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
 637
 638 static inline int
 639 hash_sessionid(struct nfs4_sessionid *sessionid)
 640 {
 641         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 642
 643         return sid->sequence % SESSION_HASH_SIZE;
 644 }
 645
 646 #ifdef NFSD_DEBUG
 647 static inline void
 648 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 649 {
 650         u32 *ptr = (u32 *)(&sessionid->data[0]);
 651         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 652 }
 653 #else
 654 static inline void
 655 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 656 {
 657 }
 658 #endif
 659
 660
 661 static void
 662 gen_sessionid(struct nfsd4_session *ses)
 663 {
 664         struct nfs4_client *clp = ses->se_client;
 665         struct nfsd4_sessionid *sid;
 666
 667         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 668         sid->clientid = clp->cl_clientid;
 669         sid->sequence = current_sessionid++;
 670         sid->reserved = 0;
 671 }
 672
 673 /*
 674  * The protocol defines ca_maxresponssize_cached to include the size of
 675  * the rpc header, but all we need to cache is the data starting after
 676  * the end of the initial SEQUENCE operation--the rest we regenerate
 677  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 678  * value that is the number of bytes in our cache plus a few additional
 679  * bytes.  In order to stay on the safe side, and not promise more than
 680  * we can cache, those additional bytes must be the minimum possible: 24
 681  * bytes of rpc header (xid through accept state, with AUTH_NULL
 682  * verifier), 12 for the compound header (with zero-length tag), and 44
 683  * for the SEQUENCE op response:
 684  */
 685 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 686
 687 static void
 688 free_session_slots(struct nfsd4_session *ses)
 689 {
 690         int i;
 691
 692         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 693                 kfree(ses->se_slots[i]);
 694 }
 695
 696 /*
 697  * We don't actually need to cache the rpc and session headers, so we
 698  * can allocate a little less for each slot:
 699  */
 700 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
 701 {
 702         return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 703 }
 704
 705 static int nfsd4_sanitize_slot_size(u32 size)
 706 {
 707         size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
 708         size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
 709
 710         return size;
 711 }
 712
 713 /*
 714  * XXX: If we run out of reserved DRC memory we could (up to a point)
 715  * re-negotiate active sessions and reduce their slot usage to make
 716  * room for new connections. For now we just fail the create session.
 717  */
 718 static int nfsd4_get_drc_mem(int slotsize, u32 num)
 719 {
 720         int avail;
 721
 722         num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
 723
 724         spin_lock(&nfsd_drc_lock);
 725         avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
 726                         nfsd_drc_max_mem - nfsd_drc_mem_used);
 727         num = min_t(int, num, avail / slotsize);
 728         nfsd_drc_mem_used += num * slotsize;
 729         spin_unlock(&nfsd_drc_lock);
 730
 731         return num;
 732 }
 733
 734 static void nfsd4_put_drc_mem(int slotsize, int num)
 735 {
 736         spin_lock(&nfsd_drc_lock);
 737         nfsd_drc_mem_used -= slotsize * num;
 738         spin_unlock(&nfsd_drc_lock);
 739 }
 740
 741 static struct nfsd4_session *__alloc_session(int slotsize, int numslots)
 742 {
 743         struct nfsd4_session *new;
 744         int mem, i;
 745
 746         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 747                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 748         mem = numslots * sizeof(struct nfsd4_slot *);
 749
 750         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 751         if (!new)
 752                 return NULL;
 753         /* allocate each struct nfsd4_slot and data cache in one piece */
 754         for (i = 0; i < numslots; i++) {
 755                 mem = sizeof(struct nfsd4_slot) + slotsize;
 756                 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
 757                 if (!new->se_slots[i])
 758                         goto out_free;
 759         }
 760         return new;
 761 out_free:
 762         while (i--)
 763                 kfree(new->se_slots[i]);
 764         kfree(new);
 765         return NULL;
 766 }
 767
 768 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
 769 {
 770         u32 maxrpc = nfsd_serv->sv_max_mesg;
 771
 772         new->maxreqs = numslots;
 773         new->maxresp_cached = min_t(u32, req->maxresp_cached,
 774                                         slotsize + NFSD_MIN_HDR_SEQ_SZ);
 775         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
 776         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
 777         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
 778 }
 779
 780 static void free_conn(struct nfsd4_conn *c)
 781 {
 782         svc_xprt_put(c->cn_xprt);
 783         kfree(c);
 784 }
 785
 786 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 787 {
 788         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 789         struct nfs4_client *clp = c->cn_session->se_client;
 790
 791         spin_lock(&clp->cl_lock);
 792         if (!list_empty(&c->cn_persession)) {
 793                 list_del(&c->cn_persession);
 794                 free_conn(c);
 795         }
 796         spin_unlock(&clp->cl_lock);
 797         nfsd4_probe_callback(clp);
 798 }
 799
 800 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 801 {
 802         struct nfsd4_conn *conn;
 803
 804         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 805         if (!conn)
 806                 return NULL;
 807         svc_xprt_get(rqstp->rq_xprt);
 808         conn->cn_xprt = rqstp->rq_xprt;
 809         conn->cn_flags = flags;
 810         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 811         return conn;
 812 }
 813
 814 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 815 {
 816         conn->cn_session = ses;
 817         list_add(&conn->cn_persession, &ses->se_conns);
 818 }
 819
 820 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 821 {
 822         struct nfs4_client *clp = ses->se_client;
 823
 824         spin_lock(&clp->cl_lock);
 825         __nfsd4_hash_conn(conn, ses);
 826         spin_unlock(&clp->cl_lock);
 827 }
 828
 829 static int nfsd4_register_conn(struct nfsd4_conn *conn)
 830 {
 831         conn->cn_xpt_user.callback = nfsd4_conn_lost;
 832         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 833 }
 834
 835 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
 836 {
 837         int ret;
 838
 839         nfsd4_hash_conn(conn, ses);
 840         ret = nfsd4_register_conn(conn);
 841         if (ret)
 842                 /* oops; xprt is already down: */
 843                 nfsd4_conn_lost(&conn->cn_xpt_user);
 844         if (conn->cn_flags & NFS4_CDFC4_BACK) {
 845                 /* callback channel may be back up */
 846                 nfsd4_probe_callback(ses->se_client);
 847         }
 848 }
 849
 850 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
 851 {
 852         u32 dir = NFS4_CDFC4_FORE;
 853
 854         if (cses->flags & SESSION4_BACK_CHAN)
 855                 dir |= NFS4_CDFC4_BACK;
 856         return alloc_conn(rqstp, dir);
 857 }
 858
 859 /* must be called under client_lock */
 860 static void nfsd4_del_conns(struct nfsd4_session *s)
 861 {
 862         struct nfs4_client *clp = s->se_client;
 863         struct nfsd4_conn *c;
 864
 865         spin_lock(&clp->cl_lock);
 866         while (!list_empty(&s->se_conns)) {
 867                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 868                 list_del_init(&c->cn_persession);
 869                 spin_unlock(&clp->cl_lock);
 870
 871                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 872                 free_conn(c);
 873
 874                 spin_lock(&clp->cl_lock);
 875         }
 876         spin_unlock(&clp->cl_lock);
 877 }
 878
 879 static void __free_session(struct nfsd4_session *ses)
 880 {
 881         nfsd4_put_drc_mem(slot_bytes(&ses->se_fchannel), ses->se_fchannel.maxreqs);
 882         free_session_slots(ses);
 883         kfree(ses);
 884 }
 885
 886 static void free_session(struct kref *kref)
 887 {
 888         struct nfsd4_session *ses;
 889
 890         lockdep_assert_held(&client_lock);
 891         ses = container_of(kref, struct nfsd4_session, se_ref);
 892         nfsd4_del_conns(ses);
 893         __free_session(ses);
 894 }
 895
 896 void nfsd4_put_session(struct nfsd4_session *ses)
 897 {
 898         spin_lock(&client_lock);
 899         nfsd4_put_session_locked(ses);
 900         spin_unlock(&client_lock);
 901 }
 902
 903 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
 904 {
 905         struct nfsd4_session *new;
 906         int numslots, slotsize;
 907         /*
 908          * Note decreasing slot size below client's request may
 909          * make it difficult for client to function correctly, whereas
 910          * decreasing the number of slots will (just?) affect
 911          * performance.  When short on memory we therefore prefer to
 912          * decrease number of slots instead of their size.
 913          */
 914         slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
 915         numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
 916         if (numslots < 1)
 917                 return NULL;
 918
 919         new = __alloc_session(slotsize, numslots);
 920         if (!new) {
 921                 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
 922                 return NULL;
 923         }
 924         init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
 925         return new;
 926 }
 927
 928 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 929 {
 930         int idx;
 931
 932         new->se_client = clp;
 933         gen_sessionid(new);
 934
 935         INIT_LIST_HEAD(&new->se_conns);
 936
 937         new->se_cb_seq_nr = 1;
 938         new->se_flags = cses->flags;
 939         new->se_cb_prog = cses->callback_prog;
 940         new->se_cb_sec = cses->cb_sec;
 941         kref_init(&new->se_ref);
 942         idx = hash_sessionid(&new->se_sessionid);
 943         spin_lock(&client_lock);
 944         list_add(&new->se_hash, &sessionid_hashtbl[idx]);
 945         spin_lock(&clp->cl_lock);
 946         list_add(&new->se_perclnt, &clp->cl_sessions);
 947         spin_unlock(&clp->cl_lock);
 948         spin_unlock(&client_lock);
 949
 950         if (cses->flags & SESSION4_BACK_CHAN) {
 951                 struct sockaddr *sa = svc_addr(rqstp);
 952                 /*
 953                  * This is a little silly; with sessions there's no real
 954                  * use for the callback address.  Use the peer address
 955                  * as a reasonable default for now, but consider fixing
 956                  * the rpc client not to require an address in the
 957                  * future:
 958                  */
 959                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
 960                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
 961         }
 962 }
 963
 964 /* caller must hold client_lock */
 965 static struct nfsd4_session *
 966 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
 967 {
 968         struct nfsd4_session *elem;
 969         int idx;
 970
 971         dump_sessionid(__func__, sessionid);
 972         idx = hash_sessionid(sessionid);
 973         /* Search in the appropriate list */
 974         list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
 975                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
 976                             NFS4_MAX_SESSIONID_LEN)) {
 977                         return elem;
 978                 }
 979         }
 980
 981         dprintk("%s: session not found\n", __func__);
 982         return NULL;
 983 }
 984
 985 /* caller must hold client_lock */
 986 static void
 987 unhash_session(struct nfsd4_session *ses)
 988 {
 989         list_del(&ses->se_hash);
 990         spin_lock(&ses->se_client->cl_lock);
 991         list_del(&ses->se_perclnt);
 992         spin_unlock(&ses->se_client->cl_lock);
 993 }
 994
 995 /* must be called under the client_lock */
 996 static inline void
 997 renew_client_locked(struct nfs4_client *clp)
 998 {
 999         if (is_client_expired(clp)) {
1000                 WARN_ON(1);
1001                 printk("%s: client (clientid %08x/%08x) already expired\n",
1002                         __func__,
1003                         clp->cl_clientid.cl_boot,
1004                         clp->cl_clientid.cl_id);
1005                 return;
1006         }
1007
1008         dprintk("renewing client (clientid %08x/%08x)\n",
1009                         clp->cl_clientid.cl_boot,
1010                         clp->cl_clientid.cl_id);
1011         list_move_tail(&clp->cl_lru, &client_lru);
1012         clp->cl_time = get_seconds();
1013 }
1014
1015 static inline void
1016 renew_client(struct nfs4_client *clp)
1017 {
1018         spin_lock(&client_lock);
1019         renew_client_locked(clp);
1020         spin_unlock(&client_lock);
1021 }
1022
1023 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1024 static int
1025 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1026 {
1027         if (clid->cl_boot == nn->boot_time)
1028                 return 0;
1029         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1030                 clid->cl_boot, clid->cl_id, nn->boot_time);
1031         return 1;
1032 }
1033
1034 /*
1035  * XXX Should we use a slab cache ?
1036  * This type of memory management is somewhat inefficient, but we use it
1037  * anyway since SETCLIENTID is not a common operation.
1038  */
1039 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1040 {
1041         struct nfs4_client *clp;
1042
1043         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1044         if (clp == NULL)
1045                 return NULL;
1046         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1047         if (clp->cl_name.data == NULL) {
1048                 kfree(clp);
1049                 return NULL;
1050         }
1051         clp->cl_name.len = name.len;
1052         return clp;
1053 }
1054
1055 static inline void
1056 free_client(struct nfs4_client *clp)
1057 {
1058         lockdep_assert_held(&client_lock);
1059         while (!list_empty(&clp->cl_sessions)) {
1060                 struct nfsd4_session *ses;
1061                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1062                                 se_perclnt);
1063                 list_del(&ses->se_perclnt);
1064                 nfsd4_put_session_locked(ses);
1065         }
1066         free_svc_cred(&clp->cl_cred);
1067         kfree(clp->cl_name.data);
1068         kfree(clp);
1069 }
1070
1071 void
1072 release_session_client(struct nfsd4_session *session)
1073 {
1074         struct nfs4_client *clp = session->se_client;
1075
1076         if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1077                 return;
1078         if (is_client_expired(clp)) {
1079                 free_client(clp);
1080                 session->se_client = NULL;
1081         } else
1082                 renew_client_locked(clp);
1083         spin_unlock(&client_lock);
1084 }
1085
1086 /* must be called under the client_lock */
1087 static inline void
1088 unhash_client_locked(struct nfs4_client *clp)
1089 {
1090         struct nfsd4_session *ses;
1091
1092         mark_client_expired(clp);
1093         list_del(&clp->cl_lru);
1094         spin_lock(&clp->cl_lock);
1095         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1096                 list_del_init(&ses->se_hash);
1097         spin_unlock(&clp->cl_lock);
1098 }
1099
1100 static void
1101 destroy_client(struct nfs4_client *clp)
1102 {
1103         struct nfs4_openowner *oo;
1104         struct nfs4_delegation *dp;
1105         struct list_head reaplist;
1106         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1107
1108         INIT_LIST_HEAD(&reaplist);
1109         spin_lock(&recall_lock);
1110         while (!list_empty(&clp->cl_delegations)) {
1111                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1112                 list_del_init(&dp->dl_perclnt);
1113                 list_move(&dp->dl_recall_lru, &reaplist);
1114         }
1115         spin_unlock(&recall_lock);
1116         while (!list_empty(&reaplist)) {
1117                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1118                 unhash_delegation(dp);
1119         }
1120         while (!list_empty(&clp->cl_openowners)) {
1121                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1122                 release_openowner(oo);
1123         }
1124         nfsd4_shutdown_callback(clp);
1125         if (clp->cl_cb_conn.cb_xprt)
1126                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1127         list_del(&clp->cl_idhash);
1128         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1129                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1130         else
1131                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1132         spin_lock(&client_lock);
1133         unhash_client_locked(clp);
1134         if (atomic_read(&clp->cl_refcount) == 0)
1135                 free_client(clp);
1136         spin_unlock(&client_lock);
1137 }
1138
1139 static void expire_client(struct nfs4_client *clp)
1140 {
1141         nfsd4_client_record_remove(clp);
1142         destroy_client(clp);
1143 }
1144
1145 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1146 {
1147         memcpy(target->cl_verifier.data, source->data,
1148                         sizeof(target->cl_verifier.data));
1149 }
1150
1151 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1152 {
1153         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1154         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1155 }
1156
1157 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1158 {
1159         if (source->cr_principal) {
1160                 target->cr_principal =
1161                                 kstrdup(source->cr_principal, GFP_KERNEL);
1162                 if (target->cr_principal == NULL)
1163                         return -ENOMEM;
1164         } else
1165                 target->cr_principal = NULL;
1166         target->cr_flavor = source->cr_flavor;
1167         target->cr_uid = source->cr_uid;
1168         target->cr_gid = source->cr_gid;
1169         target->cr_group_info = source->cr_group_info;
1170         get_group_info(target->cr_group_info);
1171         return 0;
1172 }
1173
1174 static long long
1175 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1176 {
1177         long long res;
1178
1179         res = o1->len - o2->len;
1180         if (res)
1181                 return res;
1182         return (long long)memcmp(o1->data, o2->data, o1->len);
1183 }
1184
1185 static int same_name(const char *n1, const char *n2)
1186 {
1187         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1188 }
1189
1190 static int
1191 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1192 {
1193         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1194 }
1195
1196 static int
1197 same_clid(clientid_t *cl1, clientid_t *cl2)
1198 {
1199         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1200 }
1201
1202 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1203 {
1204         int i;
1205
1206         if (g1->ngroups != g2->ngroups)
1207                 return false;
1208         for (i=0; i<g1->ngroups; i++)
1209                 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1210                         return false;
1211         return true;
1212 }
1213
1214 /*
1215  * RFC 3530 language requires clid_inuse be returned when the
1216  * "principal" associated with a requests differs from that previously
1217  * used.  We use uid, gid's, and gss principal string as our best
1218  * approximation.  We also don't want to allow non-gss use of a client
1219  * established using gss: in theory cr_principal should catch that
1220  * change, but in practice cr_principal can be null even in the gss case
1221  * since gssd doesn't always pass down a principal string.
1222  */
1223 static bool is_gss_cred(struct svc_cred *cr)
1224 {
1225         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1226         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1227 }
1228
1229
1230 static bool
1231 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1232 {
1233         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1234                 || (cr1->cr_uid != cr2->cr_uid)
1235                 || (cr1->cr_gid != cr2->cr_gid)
1236                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1237                 return false;
1238         if (cr1->cr_principal == cr2->cr_principal)
1239                 return true;
1240         if (!cr1->cr_principal || !cr2->cr_principal)
1241                 return false;
1242         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1243 }
1244
1245 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1246 {
1247         static u32 current_clientid = 1;
1248
1249         clp->cl_clientid.cl_boot = nn->boot_time;
1250         clp->cl_clientid.cl_id = current_clientid++;
1251 }
1252
1253 static void gen_confirm(struct nfs4_client *clp)
1254 {
1255         __be32 verf[2];
1256         static u32 i;
1257
1258         verf[0] = (__be32)get_seconds();
1259         verf[1] = (__be32)i++;
1260         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1261 }
1262
1263 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1264 {
1265         return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1266 }
1267
1268 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1269 {
1270         struct nfs4_stid *s;
1271
1272         s = find_stateid(cl, t);
1273         if (!s)
1274                 return NULL;
1275         if (typemask & s->sc_type)
1276                 return s;
1277         return NULL;
1278 }
1279
1280 static struct nfs4_client *create_client(struct xdr_netobj name,
1281                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1282 {
1283         struct nfs4_client *clp;
1284         struct sockaddr *sa = svc_addr(rqstp);
1285         int ret;
1286         struct net *net = SVC_NET(rqstp);
1287
1288         clp = alloc_client(name);
1289         if (clp == NULL)
1290                 return NULL;
1291
1292         INIT_LIST_HEAD(&clp->cl_sessions);
1293         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1294         if (ret) {
1295                 spin_lock(&client_lock);
1296                 free_client(clp);
1297                 spin_unlock(&client_lock);
1298                 return NULL;
1299         }
1300         idr_init(&clp->cl_stateids);
1301         atomic_set(&clp->cl_refcount, 0);
1302         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1303         INIT_LIST_HEAD(&clp->cl_idhash);
1304         INIT_LIST_HEAD(&clp->cl_openowners);
1305         INIT_LIST_HEAD(&clp->cl_delegations);
1306         INIT_LIST_HEAD(&clp->cl_lru);
1307         INIT_LIST_HEAD(&clp->cl_callbacks);
1308         spin_lock_init(&clp->cl_lock);
1309         nfsd4_init_callback(&clp->cl_cb_null);
1310         clp->cl_time = get_seconds();
1311         clear_bit(0, &clp->cl_cb_slot_busy);
1312         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1313         copy_verf(clp, verf);
1314         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1315         gen_confirm(clp);
1316         clp->cl_cb_session = NULL;
1317         clp->net = net;
1318         return clp;
1319 }
1320
1321 static void
1322 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1323 {
1324         struct rb_node **new = &(root->rb_node), *parent = NULL;
1325         struct nfs4_client *clp;
1326
1327         while (*new) {
1328                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1329                 parent = *new;
1330
1331                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1332                         new = &((*new)->rb_left);
1333                 else
1334                         new = &((*new)->rb_right);
1335         }
1336
1337         rb_link_node(&new_clp->cl_namenode, parent, new);
1338         rb_insert_color(&new_clp->cl_namenode, root);
1339 }
1340
1341 static struct nfs4_client *
1342 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1343 {
1344         long long cmp;
1345         struct rb_node *node = root->rb_node;
1346         struct nfs4_client *clp;
1347
1348         while (node) {
1349                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1350                 cmp = compare_blob(&clp->cl_name, name);
1351                 if (cmp > 0)
1352                         node = node->rb_left;
1353                 else if (cmp < 0)
1354                         node = node->rb_right;
1355                 else
1356                         return clp;
1357         }
1358         return NULL;
1359 }
1360
1361 static void
1362 add_to_unconfirmed(struct nfs4_client *clp)
1363 {
1364         unsigned int idhashval;
1365         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1366
1367         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1368         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1369         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1370         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1371         renew_client(clp);
1372 }
1373
1374 static void
1375 move_to_confirmed(struct nfs4_client *clp)
1376 {
1377         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1378         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1379
1380         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1381         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1382         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1383         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1384         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1385         renew_client(clp);
1386 }
1387
1388 static struct nfs4_client *
1389 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1390 {
1391         struct nfs4_client *clp;
1392         unsigned int idhashval = clientid_hashval(clid->cl_id);
1393
1394         list_for_each_entry(clp, &nn->conf_id_hashtbl[idhashval], cl_idhash) {
1395                 if (same_clid(&clp->cl_clientid, clid)) {
1396                         if ((bool)clp->cl_minorversion != sessions)
1397                                 return NULL;
1398                         renew_client(clp);
1399                         return clp;
1400                 }
1401         }
1402         return NULL;
1403 }
1404
1405 static struct nfs4_client *
1406 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1407 {
1408         struct nfs4_client *clp;
1409         unsigned int idhashval = clientid_hashval(clid->cl_id);
1410
1411         list_for_each_entry(clp, &nn->unconf_id_hashtbl[idhashval], cl_idhash) {
1412                 if (same_clid(&clp->cl_clientid, clid)) {
1413                         if ((bool)clp->cl_minorversion != sessions)
1414                                 return NULL;
1415                         return clp;
1416                 }
1417         }
1418         return NULL;
1419 }
1420
1421 static bool clp_used_exchangeid(struct nfs4_client *clp)
1422 {
1423         return clp->cl_exchange_flags != 0;
1424 }
1425
1426 static struct nfs4_client *
1427 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1428 {
1429         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1430 }
1431
1432 static struct nfs4_client *
1433 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1434 {
1435         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1436 }
1437
1438 static void
1439 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1440 {
1441         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1442         struct sockaddr *sa = svc_addr(rqstp);
1443         u32 scopeid = rpc_get_scope_id(sa);
1444         unsigned short expected_family;
1445
1446         /* Currently, we only support tcp and tcp6 for the callback channel */
1447         if (se->se_callback_netid_len == 3 &&
1448             !memcmp(se->se_callback_netid_val, "tcp", 3))
1449                 expected_family = AF_INET;
1450         else if (se->se_callback_netid_len == 4 &&
1451                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1452                 expected_family = AF_INET6;
1453         else
1454                 goto out_err;
1455
1456         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1457                                             se->se_callback_addr_len,
1458                                             (struct sockaddr *)&conn->cb_addr,
1459                                             sizeof(conn->cb_addr));
1460
1461         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1462                 goto out_err;
1463
1464         if (conn->cb_addr.ss_family == AF_INET6)
1465                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1466
1467         conn->cb_prog = se->se_callback_prog;
1468         conn->cb_ident = se->se_callback_ident;
1469         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1470         return;
1471 out_err:
1472         conn->cb_addr.ss_family = AF_UNSPEC;
1473         conn->cb_addrlen = 0;
1474         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1475                 "will not receive delegations\n",
1476                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1477
1478         return;
1479 }
1480
1481 /*
1482  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1483  */
1484 void
1485 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1486 {
1487         struct nfsd4_slot *slot = resp->cstate.slot;
1488         unsigned int base;
1489
1490         dprintk("--> %s slot %p\n", __func__, slot);
1491
1492         slot->sl_opcnt = resp->opcnt;
1493         slot->sl_status = resp->cstate.status;
1494
1495         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1496         if (nfsd4_not_cached(resp)) {
1497                 slot->sl_datalen = 0;
1498                 return;
1499         }
1500         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1501         base = (char *)resp->cstate.datap -
1502                                         (char *)resp->xbuf->head[0].iov_base;
1503         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1504                                     slot->sl_datalen))
1505                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1506         return;
1507 }
1508
1509 /*
1510  * Encode the replay sequence operation from the slot values.
1511  * If cachethis is FALSE encode the uncached rep error on the next
1512  * operation which sets resp->p and increments resp->opcnt for
1513  * nfs4svc_encode_compoundres.
1514  *
1515  */
1516 static __be32
1517 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1518                           struct nfsd4_compoundres *resp)
1519 {
1520         struct nfsd4_op *op;
1521         struct nfsd4_slot *slot = resp->cstate.slot;
1522
1523         /* Encode the replayed sequence operation */
1524         op = &args->ops[resp->opcnt - 1];
1525         nfsd4_encode_operation(resp, op);
1526
1527         /* Return nfserr_retry_uncached_rep in next operation. */
1528         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1529                 op = &args->ops[resp->opcnt++];
1530                 op->status = nfserr_retry_uncached_rep;
1531                 nfsd4_encode_operation(resp, op);
1532         }
1533         return op->status;
1534 }
1535
1536 /*
1537  * The sequence operation is not cached because we can use the slot and
1538  * session values.
1539  */
1540 __be32
1541 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1542                          struct nfsd4_sequence *seq)
1543 {
1544         struct nfsd4_slot *slot = resp->cstate.slot;
1545         __be32 status;
1546
1547         dprintk("--> %s slot %p\n", __func__, slot);
1548
1549         /* Either returns 0 or nfserr_retry_uncached */
1550         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1551         if (status == nfserr_retry_uncached_rep)
1552                 return status;
1553
1554         /* The sequence operation has been encoded, cstate->datap set. */
1555         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1556
1557         resp->opcnt = slot->sl_opcnt;
1558         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1559         status = slot->sl_status;
1560
1561         return status;
1562 }
1563
1564 /*
1565  * Set the exchange_id flags returned by the server.
1566  */
1567 static void
1568 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1569 {
1570         /* pNFS is not supported */
1571         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1572
1573         /* Referrals are supported, Migration is not. */
1574         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1575
1576         /* set the wire flags to return to client. */
1577         clid->flags = new->cl_exchange_flags;
1578 }
1579
1580 static bool client_has_state(struct nfs4_client *clp)
1581 {
1582         /*
1583          * Note clp->cl_openowners check isn't quite right: there's no
1584          * need to count owners without stateid's.
1585          *
1586          * Also note we should probably be using this in 4.0 case too.
1587          */
1588         return !list_empty(&clp->cl_openowners)
1589                 || !list_empty(&clp->cl_delegations)
1590                 || !list_empty(&clp->cl_sessions);
1591 }
1592
1593 __be32
1594 nfsd4_exchange_id(struct svc_rqst *rqstp,
1595                   struct nfsd4_compound_state *cstate,
1596                   struct nfsd4_exchange_id *exid)
1597 {
1598         struct nfs4_client *unconf, *conf, *new;
1599         __be32 status;
1600         char                    addr_str[INET6_ADDRSTRLEN];
1601         nfs4_verifier           verf = exid->verifier;
1602         struct sockaddr         *sa = svc_addr(rqstp);
1603         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1604         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1605
1606         rpc_ntop(sa, addr_str, sizeof(addr_str));
1607         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1608                 "ip_addr=%s flags %x, spa_how %d\n",
1609                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1610                 addr_str, exid->flags, exid->spa_how);
1611
1612         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1613                 return nfserr_inval;
1614
1615         /* Currently only support SP4_NONE */
1616         switch (exid->spa_how) {
1617         case SP4_NONE:
1618                 break;
1619         case SP4_SSV:
1620                 return nfserr_serverfault;
1621         default:
1622                 BUG();                          /* checked by xdr code */
1623         case SP4_MACH_CRED:
1624                 return nfserr_serverfault;      /* no excuse :-/ */
1625         }
1626
1627         /* Cases below refer to rfc 5661 section 18.35.4: */
1628         nfs4_lock_state();
1629         conf = find_confirmed_client_by_name(&exid->clname, nn);
1630         if (conf) {
1631                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1632                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1633
1634                 if (update) {
1635                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1636                                 status = nfserr_inval;
1637                                 goto out;
1638                         }
1639                         if (!creds_match) { /* case 9 */
1640                                 status = nfserr_perm;
1641                                 goto out;
1642                         }
1643                         if (!verfs_match) { /* case 8 */
1644                                 status = nfserr_not_same;
1645                                 goto out;
1646                         }
1647                         /* case 6 */
1648                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1649                         new = conf;
1650                         goto out_copy;
1651                 }
1652                 if (!creds_match) { /* case 3 */
1653                         if (client_has_state(conf)) {
1654                                 status = nfserr_clid_inuse;
1655                                 goto out;
1656                         }
1657                         expire_client(conf);
1658                         goto out_new;
1659                 }
1660                 if (verfs_match) { /* case 2 */
1661                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1662                         new = conf;
1663                         goto out_copy;
1664                 }
1665                 /* case 5, client reboot */
1666                 goto out_new;
1667         }
1668
1669         if (update) { /* case 7 */
1670                 status = nfserr_noent;
1671                 goto out;
1672         }
1673
1674         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1675         if (unconf) /* case 4, possible retry or client restart */
1676                 expire_client(unconf);
1677
1678         /* case 1 (normal case) */
1679 out_new:
1680         new = create_client(exid->clname, rqstp, &verf);
1681         if (new == NULL) {
1682                 status = nfserr_jukebox;
1683                 goto out;
1684         }
1685         new->cl_minorversion = 1;
1686
1687         gen_clid(new, nn);
1688         add_to_unconfirmed(new);
1689 out_copy:
1690         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1691         exid->clientid.cl_id = new->cl_clientid.cl_id;
1692
1693         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1694         nfsd4_set_ex_flags(new, exid);
1695
1696         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1697                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1698         status = nfs_ok;
1699
1700 out:
1701         nfs4_unlock_state();
1702         return status;
1703 }
1704
1705 static __be32
1706 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1707 {
1708         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1709                 slot_seqid);
1710
1711         /* The slot is in use, and no response has been sent. */
1712         if (slot_inuse) {
1713                 if (seqid == slot_seqid)
1714                         return nfserr_jukebox;
1715                 else
1716                         return nfserr_seq_misordered;
1717         }
1718         /* Note unsigned 32-bit arithmetic handles wraparound: */
1719         if (likely(seqid == slot_seqid + 1))
1720                 return nfs_ok;
1721         if (seqid == slot_seqid)
1722                 return nfserr_replay_cache;
1723         return nfserr_seq_misordered;
1724 }
1725
1726 /*
1727  * Cache the create session result into the create session single DRC
1728  * slot cache by saving the xdr structure. sl_seqid has been set.
1729  * Do this for solo or embedded create session operations.
1730  */
1731 static void
1732 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1733                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1734 {
1735         slot->sl_status = nfserr;
1736         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1737 }
1738
1739 static __be32
1740 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1741                             struct nfsd4_clid_slot *slot)
1742 {
1743         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1744         return slot->sl_status;
1745 }
1746
1747 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1748                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1749                         1 +     /* MIN tag is length with zero, only length */ \
1750                         3 +     /* version, opcount, opcode */ \
1751                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1752                                 /* seqid, slotID, slotID, cache */ \
1753                         4 ) * sizeof(__be32))
1754
1755 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1756                         2 +     /* verifier: AUTH_NULL, length 0 */\
1757                         1 +     /* status */ \
1758                         1 +     /* MIN tag is length with zero, only length */ \
1759                         3 +     /* opcount, opcode, opstatus*/ \
1760                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1761                                 /* seqid, slotID, slotID, slotID, status */ \
1762                         5 ) * sizeof(__be32))
1763
1764 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1765 {
1766         return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1767                 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1768 }
1769
1770 __be32
1771 nfsd4_create_session(struct svc_rqst *rqstp,
1772                      struct nfsd4_compound_state *cstate,
1773                      struct nfsd4_create_session *cr_ses)
1774 {
1775         struct sockaddr *sa = svc_addr(rqstp);
1776         struct nfs4_client *conf, *unconf;
1777         struct nfsd4_session *new;
1778         struct nfsd4_conn *conn;
1779         struct nfsd4_clid_slot *cs_slot = NULL;
1780         __be32 status = 0;
1781         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1782
1783         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1784                 return nfserr_inval;
1785         if (check_forechannel_attrs(cr_ses->fore_channel))
1786                 return nfserr_toosmall;
1787         new = alloc_session(&cr_ses->fore_channel);
1788         if (!new)
1789                 return nfserr_jukebox;
1790         status = nfserr_jukebox;
1791         conn = alloc_conn_from_crses(rqstp, cr_ses);
1792         if (!conn)
1793                 goto out_free_session;
1794
1795         nfs4_lock_state();
1796         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1797         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1798
1799         if (conf) {
1800                 cs_slot = &conf->cl_cs_slot;
1801                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1802                 if (status == nfserr_replay_cache) {
1803                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1804                         goto out_free_conn;
1805                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1806                         status = nfserr_seq_misordered;
1807                         goto out_free_conn;
1808                 }
1809         } else if (unconf) {
1810                 struct nfs4_client *old;
1811                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1812                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1813                         status = nfserr_clid_inuse;
1814                         goto out_free_conn;
1815                 }
1816                 cs_slot = &unconf->cl_cs_slot;
1817                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1818                 if (status) {
1819                         /* an unconfirmed replay returns misordered */
1820                         status = nfserr_seq_misordered;
1821                         goto out_free_conn;
1822                 }
1823                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1824                 if (old)
1825                         expire_client(old);
1826                 move_to_confirmed(unconf);
1827                 conf = unconf;
1828         } else {
1829                 status = nfserr_stale_clientid;
1830                 goto out_free_conn;
1831         }
1832         status = nfs_ok;
1833         /*
1834          * We do not support RDMA or persistent sessions
1835          */
1836         cr_ses->flags &= ~SESSION4_PERSIST;
1837         cr_ses->flags &= ~SESSION4_RDMA;
1838
1839         init_session(rqstp, new, conf, cr_ses);
1840         nfsd4_init_conn(rqstp, conn, new);
1841
1842         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1843                NFS4_MAX_SESSIONID_LEN);
1844         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1845                 sizeof(struct nfsd4_channel_attrs));
1846         cs_slot->sl_seqid++;
1847         cr_ses->seqid = cs_slot->sl_seqid;
1848
1849         /* cache solo and embedded create sessions under the state lock */
1850         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1851 out:
1852         nfs4_unlock_state();
1853         dprintk("%s returns %d\n", __func__, ntohl(status));
1854         return status;
1855 out_free_conn:
1856         free_conn(conn);
1857 out_free_session:
1858         __free_session(new);
1859         goto out;
1860 }
1861
1862 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1863 {
1864         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1865         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1866
1867         return argp->opcnt == resp->opcnt;
1868 }
1869
1870 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1871 {
1872         switch (*dir) {
1873         case NFS4_CDFC4_FORE:
1874         case NFS4_CDFC4_BACK:
1875                 return nfs_ok;
1876         case NFS4_CDFC4_FORE_OR_BOTH:
1877         case NFS4_CDFC4_BACK_OR_BOTH:
1878                 *dir = NFS4_CDFC4_BOTH;
1879                 return nfs_ok;
1880         };
1881         return nfserr_inval;
1882 }
1883
1884 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1885 {
1886         struct nfsd4_session *session = cstate->session;
1887
1888         spin_lock(&client_lock);
1889         session->se_cb_prog = bc->bc_cb_program;
1890         session->se_cb_sec = bc->bc_cb_sec;
1891         spin_unlock(&client_lock);
1892
1893         nfsd4_probe_callback(session->se_client);
1894
1895         return nfs_ok;
1896 }
1897
1898 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1899                      struct nfsd4_compound_state *cstate,
1900                      struct nfsd4_bind_conn_to_session *bcts)
1901 {
1902         __be32 status;
1903         struct nfsd4_conn *conn;
1904
1905         if (!nfsd4_last_compound_op(rqstp))
1906                 return nfserr_not_only_op;
1907         spin_lock(&client_lock);
1908         cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1909         /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1910          * client_lock iself: */
1911         if (cstate->session) {
1912                 nfsd4_get_session(cstate->session);
1913                 atomic_inc(&cstate->session->se_client->cl_refcount);
1914         }
1915         spin_unlock(&client_lock);
1916         if (!cstate->session)
1917                 return nfserr_badsession;
1918
1919         status = nfsd4_map_bcts_dir(&bcts->dir);
1920         if (status)
1921                 return status;
1922         conn = alloc_conn(rqstp, bcts->dir);
1923         if (!conn)
1924                 return nfserr_jukebox;
1925         nfsd4_init_conn(rqstp, conn, cstate->session);
1926         return nfs_ok;
1927 }
1928
1929 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1930 {
1931         if (!session)
1932                 return 0;
1933         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1934 }
1935
1936 __be32
1937 nfsd4_destroy_session(struct svc_rqst *r,
1938                       struct nfsd4_compound_state *cstate,
1939                       struct nfsd4_destroy_session *sessionid)
1940 {
1941         struct nfsd4_session *ses;
1942         __be32 status = nfserr_badsession;
1943
1944         /* Notes:
1945          * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1946          * - Should we return nfserr_back_chan_busy if waiting for
1947          *   callbacks on to-be-destroyed session?
1948          * - Do we need to clear any callback info from previous session?
1949          */
1950
1951         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1952                 if (!nfsd4_last_compound_op(r))
1953                         return nfserr_not_only_op;
1954         }
1955         dump_sessionid(__func__, &sessionid->sessionid);
1956         spin_lock(&client_lock);
1957         ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1958         if (!ses) {
1959                 spin_unlock(&client_lock);
1960                 goto out;
1961         }
1962
1963         unhash_session(ses);
1964         spin_unlock(&client_lock);
1965
1966         nfs4_lock_state();
1967         nfsd4_probe_callback_sync(ses->se_client);
1968         nfs4_unlock_state();
1969
1970         spin_lock(&client_lock);
1971         nfsd4_del_conns(ses);
1972         nfsd4_put_session_locked(ses);
1973         spin_unlock(&client_lock);
1974         status = nfs_ok;
1975 out:
1976         dprintk("%s returns %d\n", __func__, ntohl(status));
1977         return status;
1978 }
1979
1980 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1981 {
1982         struct nfsd4_conn *c;
1983
1984         list_for_each_entry(c, &s->se_conns, cn_persession) {
1985                 if (c->cn_xprt == xpt) {
1986                         return c;
1987                 }
1988         }
1989         return NULL;
1990 }
1991
1992 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1993 {
1994         struct nfs4_client *clp = ses->se_client;
1995         struct nfsd4_conn *c;
1996         int ret;
1997
1998         spin_lock(&clp->cl_lock);
1999         c = __nfsd4_find_conn(new->cn_xprt, ses);
2000         if (c) {
2001                 spin_unlock(&clp->cl_lock);
2002                 free_conn(new);
2003                 return;
2004         }
2005         __nfsd4_hash_conn(new, ses);
2006         spin_unlock(&clp->cl_lock);
2007         ret = nfsd4_register_conn(new);
2008         if (ret)
2009                 /* oops; xprt is already down: */
2010                 nfsd4_conn_lost(&new->cn_xpt_user);
2011         return;
2012 }
2013
2014 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2015 {
2016         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2017
2018         return args->opcnt > session->se_fchannel.maxops;
2019 }
2020
2021 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2022                                   struct nfsd4_session *session)
2023 {
2024         struct xdr_buf *xb = &rqstp->rq_arg;
2025
2026         return xb->len > session->se_fchannel.maxreq_sz;
2027 }
2028
2029 __be32
2030 nfsd4_sequence(struct svc_rqst *rqstp,
2031                struct nfsd4_compound_state *cstate,
2032                struct nfsd4_sequence *seq)
2033 {
2034         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2035         struct nfsd4_session *session;
2036         struct nfsd4_slot *slot;
2037         struct nfsd4_conn *conn;
2038         __be32 status;
2039
2040         if (resp->opcnt != 1)
2041                 return nfserr_sequence_pos;
2042
2043         /*
2044          * Will be either used or freed by nfsd4_sequence_check_conn
2045          * below.
2046          */
2047         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2048         if (!conn)
2049                 return nfserr_jukebox;
2050
2051         spin_lock(&client_lock);
2052         status = nfserr_badsession;
2053         session = find_in_sessionid_hashtbl(&seq->sessionid);
2054         if (!session)
2055                 goto out;
2056
2057         status = nfserr_too_many_ops;
2058         if (nfsd4_session_too_many_ops(rqstp, session))
2059                 goto out;
2060
2061         status = nfserr_req_too_big;
2062         if (nfsd4_request_too_big(rqstp, session))
2063                 goto out;
2064
2065         status = nfserr_badslot;
2066         if (seq->slotid >= session->se_fchannel.maxreqs)
2067                 goto out;
2068
2069         slot = session->se_slots[seq->slotid];
2070         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2071
2072         /* We do not negotiate the number of slots yet, so set the
2073          * maxslots to the session maxreqs which is used to encode
2074          * sr_highest_slotid and the sr_target_slot id to maxslots */
2075         seq->maxslots = session->se_fchannel.maxreqs;
2076
2077         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2078                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2079         if (status == nfserr_replay_cache) {
2080                 status = nfserr_seq_misordered;
2081                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2082                         goto out;
2083                 cstate->slot = slot;
2084                 cstate->session = session;
2085                 /* Return the cached reply status and set cstate->status
2086                  * for nfsd4_proc_compound processing */
2087                 status = nfsd4_replay_cache_entry(resp, seq);
2088                 cstate->status = nfserr_replay_cache;
2089                 goto out;
2090         }
2091         if (status)
2092                 goto out;
2093
2094         nfsd4_sequence_check_conn(conn, session);
2095         conn = NULL;
2096
2097         /* Success! bump slot seqid */
2098         slot->sl_seqid = seq->seqid;
2099         slot->sl_flags |= NFSD4_SLOT_INUSE;
2100         if (seq->cachethis)
2101                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2102         else
2103                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2104
2105         cstate->slot = slot;
2106         cstate->session = session;
2107
2108 out:
2109         /* Hold a session reference until done processing the compound. */
2110         if (cstate->session) {
2111                 struct nfs4_client *clp = session->se_client;
2112
2113                 nfsd4_get_session(cstate->session);
2114                 atomic_inc(&clp->cl_refcount);
2115                 switch (clp->cl_cb_state) {
2116                 case NFSD4_CB_DOWN:
2117                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2118                         break;
2119                 case NFSD4_CB_FAULT:
2120                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2121                         break;
2122                 default:
2123                         seq->status_flags = 0;
2124                 }
2125         }
2126         kfree(conn);
2127         spin_unlock(&client_lock);
2128         dprintk("%s: return %d\n", __func__, ntohl(status));
2129         return status;
2130 }
2131
2132 __be32
2133 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2134 {
2135         struct nfs4_client *conf, *unconf, *clp;
2136         __be32 status = 0;
2137         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2138
2139         nfs4_lock_state();
2140         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2141         conf = find_confirmed_client(&dc->clientid, true, nn);
2142
2143         if (conf) {
2144                 clp = conf;
2145
2146                 if (!is_client_expired(conf) && client_has_state(conf)) {
2147                         status = nfserr_clientid_busy;
2148                         goto out;
2149                 }
2150
2151                 /* rfc5661 18.50.3 */
2152                 if (cstate->session && conf == cstate->session->se_client) {
2153                         status = nfserr_clientid_busy;
2154                         goto out;
2155                 }
2156         } else if (unconf)
2157                 clp = unconf;
2158         else {
2159                 status = nfserr_stale_clientid;
2160                 goto out;
2161         }
2162
2163         expire_client(clp);
2164 out:
2165         nfs4_unlock_state();
2166         dprintk("%s return %d\n", __func__, ntohl(status));
2167         return status;
2168 }
2169
2170 __be32
2171 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2172 {
2173         __be32 status = 0;
2174
2175         if (rc->rca_one_fs) {
2176                 if (!cstate->current_fh.fh_dentry)
2177                         return nfserr_nofilehandle;
2178                 /*
2179                  * We don't take advantage of the rca_one_fs case.
2180                  * That's OK, it's optional, we can safely ignore it.
2181                  */
2182                  return nfs_ok;
2183         }
2184
2185         nfs4_lock_state();
2186         status = nfserr_complete_already;
2187         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2188                              &cstate->session->se_client->cl_flags))
2189                 goto out;
2190
2191         status = nfserr_stale_clientid;
2192         if (is_client_expired(cstate->session->se_client))
2193                 /*
2194                  * The following error isn't really legal.
2195                  * But we only get here if the client just explicitly
2196                  * destroyed the client.  Surely it no longer cares what
2197                  * error it gets back on an operation for the dead
2198                  * client.
2199                  */
2200                 goto out;
2201
2202         status = nfs_ok;
2203         nfsd4_client_record_create(cstate->session->se_client);
2204 out:
2205         nfs4_unlock_state();
2206         return status;
2207 }
2208
2209 __be32
2210 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2211                   struct nfsd4_setclientid *setclid)
2212 {
2213         struct xdr_netobj       clname = setclid->se_name;
2214         nfs4_verifier           clverifier = setclid->se_verf;
2215         struct nfs4_client      *conf, *unconf, *new;
2216         __be32                  status;
2217         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2218
2219         /* Cases below refer to rfc 3530 section 14.2.33: */
2220         nfs4_lock_state();
2221         conf = find_confirmed_client_by_name(&clname, nn);
2222         if (conf) {
2223                 /* case 0: */
2224                 status = nfserr_clid_inuse;
2225                 if (clp_used_exchangeid(conf))
2226                         goto out;
2227                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2228                         char addr_str[INET6_ADDRSTRLEN];
2229                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2230                                  sizeof(addr_str));
2231                         dprintk("NFSD: setclientid: string in use by client "
2232                                 "at %s\n", addr_str);
2233                         goto out;
2234                 }
2235         }
2236         unconf = find_unconfirmed_client_by_name(&clname, nn);
2237         if (unconf)
2238                 expire_client(unconf);
2239         status = nfserr_jukebox;
2240         new = create_client(clname, rqstp, &clverifier);
2241         if (new == NULL)
2242                 goto out;
2243         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2244                 /* case 1: probable callback update */
2245                 copy_clid(new, conf);
2246         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2247                 gen_clid(new, nn);
2248         new->cl_minorversion = 0;
2249         gen_callback(new, setclid, rqstp);
2250         add_to_unconfirmed(new);
2251         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2252         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2253         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2254         status = nfs_ok;
2255 out:
2256         nfs4_unlock_state();
2257         return status;
2258 }
2259
2260
2261 __be32
2262 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2263                          struct nfsd4_compound_state *cstate,
2264                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2265 {
2266         struct nfs4_client *conf, *unconf;
2267         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2268         clientid_t * clid = &setclientid_confirm->sc_clientid;
2269         __be32 status;
2270         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2271
2272         if (STALE_CLIENTID(clid, nn))
2273                 return nfserr_stale_clientid;
2274         nfs4_lock_state();
2275
2276         conf = find_confirmed_client(clid, false, nn);
2277         unconf = find_unconfirmed_client(clid, false, nn);
2278         /*
2279          * We try hard to give out unique clientid's, so if we get an
2280          * attempt to confirm the same clientid with a different cred,
2281          * there's a bug somewhere.  Let's charitably assume it's our
2282          * bug.
2283          */
2284         status = nfserr_serverfault;
2285         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2286                 goto out;
2287         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2288                 goto out;
2289         /* cases below refer to rfc 3530 section 14.2.34: */
2290         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2291                 if (conf && !unconf) /* case 2: probable retransmit */
2292                         status = nfs_ok;
2293                 else /* case 4: client hasn't noticed we rebooted yet? */
2294                         status = nfserr_stale_clientid;
2295                 goto out;
2296         }
2297         status = nfs_ok;
2298         if (conf) { /* case 1: callback update */
2299                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2300                 nfsd4_probe_callback(conf);
2301                 expire_client(unconf);
2302         } else { /* case 3: normal case; new or rebooted client */
2303                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2304                 if (conf)
2305                         expire_client(conf);
2306                 move_to_confirmed(unconf);
2307                 nfsd4_probe_callback(unconf);
2308         }
2309 out:
2310         nfs4_unlock_state();
2311         return status;
2312 }
2313
2314 static struct nfs4_file *nfsd4_alloc_file(void)
2315 {
2316         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2317 }
2318
2319 /* OPEN Share state helper functions */
2320 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2321 {
2322         unsigned int hashval = file_hashval(ino);
2323
2324         atomic_set(&fp->fi_ref, 1);
2325         INIT_LIST_HEAD(&fp->fi_hash);
2326         INIT_LIST_HEAD(&fp->fi_stateids);
2327         INIT_LIST_HEAD(&fp->fi_delegations);
2328         fp->fi_inode = igrab(ino);
2329         fp->fi_had_conflict = false;
2330         fp->fi_lease = NULL;
2331         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2332         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2333         spin_lock(&recall_lock);
2334         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2335         spin_unlock(&recall_lock);
2336 }
2337
2338 static void
2339 nfsd4_free_slab(struct kmem_cache **slab)
2340 {
2341         if (*slab == NULL)
2342                 return;
2343         kmem_cache_destroy(*slab);
2344         *slab = NULL;
2345 }
2346
2347 void
2348 nfsd4_free_slabs(void)
2349 {
2350         nfsd4_free_slab(&openowner_slab);
2351         nfsd4_free_slab(&lockowner_slab);
2352         nfsd4_free_slab(&file_slab);
2353         nfsd4_free_slab(&stateid_slab);
2354         nfsd4_free_slab(&deleg_slab);
2355 }
2356
2357 int
2358 nfsd4_init_slabs(void)
2359 {
2360         openowner_slab = kmem_cache_create("nfsd4_openowners",
2361                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2362         if (openowner_slab == NULL)
2363                 goto out_nomem;
2364         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2365                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2366         if (lockowner_slab == NULL)
2367                 goto out_nomem;
2368         file_slab = kmem_cache_create("nfsd4_files",
2369                         sizeof(struct nfs4_file), 0, 0, NULL);
2370         if (file_slab == NULL)
2371                 goto out_nomem;
2372         stateid_slab = kmem_cache_create("nfsd4_stateids",
2373                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2374         if (stateid_slab == NULL)
2375                 goto out_nomem;
2376         deleg_slab = kmem_cache_create("nfsd4_delegations",
2377                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2378         if (deleg_slab == NULL)
2379                 goto out_nomem;
2380         return 0;
2381 out_nomem:
2382         nfsd4_free_slabs();
2383         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2384         return -ENOMEM;
2385 }
2386
2387 void nfs4_free_openowner(struct nfs4_openowner *oo)
2388 {
2389         kfree(oo->oo_owner.so_owner.data);
2390         kmem_cache_free(openowner_slab, oo);
2391 }
2392
2393 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2394 {
2395         kfree(lo->lo_owner.so_owner.data);
2396         kmem_cache_free(lockowner_slab, lo);
2397 }
2398
2399 static void init_nfs4_replay(struct nfs4_replay *rp)
2400 {
2401         rp->rp_status = nfserr_serverfault;
2402         rp->rp_buflen = 0;
2403         rp->rp_buf = rp->rp_ibuf;
2404 }
2405
2406 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2407 {
2408         struct nfs4_stateowner *sop;
2409
2410         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2411         if (!sop)
2412                 return NULL;
2413
2414         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2415         if (!sop->so_owner.data) {
2416                 kmem_cache_free(slab, sop);
2417                 return NULL;
2418         }
2419         sop->so_owner.len = owner->len;
2420
2421         INIT_LIST_HEAD(&sop->so_stateids);
2422         sop->so_client = clp;
2423         init_nfs4_replay(&sop->so_replay);
2424         return sop;
2425 }
2426
2427 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2428 {
2429         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2430
2431         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2432         list_add(&oo->oo_perclient, &clp->cl_openowners);
2433 }
2434
2435 static struct nfs4_openowner *
2436 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2437         struct nfs4_openowner *oo;
2438
2439         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2440         if (!oo)
2441                 return NULL;
2442         oo->oo_owner.so_is_open_owner = 1;
2443         oo->oo_owner.so_seqid = open->op_seqid;
2444         oo->oo_flags = NFS4_OO_NEW;
2445         oo->oo_time = 0;
2446         oo->oo_last_closed_stid = NULL;
2447         INIT_LIST_HEAD(&oo->oo_close_lru);
2448         hash_openowner(oo, clp, strhashval);
2449         return oo;
2450 }
2451
2452 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2453         struct nfs4_openowner *oo = open->op_openowner;
2454         struct nfs4_client *clp = oo->oo_owner.so_client;
2455
2456         init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2457         INIT_LIST_HEAD(&stp->st_lockowners);
2458         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2459         list_add(&stp->st_perfile, &fp->fi_stateids);
2460         stp->st_stateowner = &oo->oo_owner;
2461         get_nfs4_file(fp);
2462         stp->st_file = fp;
2463         stp->st_access_bmap = 0;
2464         stp->st_deny_bmap = 0;
2465         set_access(open->op_share_access, stp);
2466         set_deny(open->op_share_deny, stp);
2467         stp->st_openstp = NULL;
2468 }
2469
2470 static void
2471 move_to_close_lru(struct nfs4_openowner *oo)
2472 {
2473         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2474
2475         list_move_tail(&oo->oo_close_lru, &close_lru);
2476         oo->oo_time = get_seconds();
2477 }
2478
2479 static int
2480 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2481                                                         clientid_t *clid)
2482 {
2483         return (sop->so_owner.len == owner->len) &&
2484                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2485                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2486 }
2487
2488 static struct nfs4_openowner *
2489 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2490                         bool sessions, struct nfsd_net *nn)
2491 {
2492         struct nfs4_stateowner *so;
2493         struct nfs4_openowner *oo;
2494         struct nfs4_client *clp;
2495
2496         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2497                 if (!so->so_is_open_owner)
2498                         continue;
2499                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2500                         oo = openowner(so);
2501                         clp = oo->oo_owner.so_client;
2502                         if ((bool)clp->cl_minorversion != sessions)
2503                                 return NULL;
2504                         renew_client(oo->oo_owner.so_client);
2505                         return oo;
2506                 }
2507         }
2508         return NULL;
2509 }
2510
2511 /* search file_hashtbl[] for file */
2512 static struct nfs4_file *
2513 find_file(struct inode *ino)
2514 {
2515         unsigned int hashval = file_hashval(ino);
2516         struct nfs4_file *fp;
2517
2518         spin_lock(&recall_lock);
2519         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2520                 if (fp->fi_inode == ino) {
2521                         get_nfs4_file(fp);
2522                         spin_unlock(&recall_lock);
2523                         return fp;
2524                 }
2525         }
2526         spin_unlock(&recall_lock);
2527         return NULL;
2528 }
2529
2530 /*
2531  * Called to check deny when READ with all zero stateid or
2532  * WRITE with all zero or all one stateid
2533  */
2534 static __be32
2535 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2536 {
2537         struct inode *ino = current_fh->fh_dentry->d_inode;
2538         struct nfs4_file *fp;
2539         struct nfs4_ol_stateid *stp;
2540         __be32 ret;
2541
2542         dprintk("NFSD: nfs4_share_conflict\n");
2543
2544         fp = find_file(ino);
2545         if (!fp)
2546                 return nfs_ok;
2547         ret = nfserr_locked;
2548         /* Search for conflicting share reservations */
2549         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2550                 if (test_deny(deny_type, stp) ||
2551                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2552                         goto out;
2553         }
2554         ret = nfs_ok;
2555 out:
2556         put_nfs4_file(fp);
2557         return ret;
2558 }
2559
2560 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2561 {
2562         /* We're assuming the state code never drops its reference
2563          * without first removing the lease.  Since we're in this lease
2564          * callback (and since the lease code is serialized by the kernel
2565          * lock) we know the server hasn't removed the lease yet, we know
2566          * it's safe to take a reference: */
2567         atomic_inc(&dp->dl_count);
2568
2569         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2570
2571         /* only place dl_time is set. protected by lock_flocks*/
2572         dp->dl_time = get_seconds();
2573
2574         nfsd4_cb_recall(dp);
2575 }
2576
2577 /* Called from break_lease() with lock_flocks() held. */
2578 static void nfsd_break_deleg_cb(struct file_lock *fl)
2579 {
2580         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2581         struct nfs4_delegation *dp;
2582
2583         if (!fp) {
2584                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2585                 return;
2586         }
2587         if (fp->fi_had_conflict) {
2588                 WARN(1, "duplicate break on %p\n", fp);
2589                 return;
2590         }
2591         /*
2592          * We don't want the locks code to timeout the lease for us;
2593          * we'll remove it ourself if a delegation isn't returned
2594          * in time:
2595          */
2596         fl->fl_break_time = 0;
2597
2598         spin_lock(&recall_lock);
2599         fp->fi_had_conflict = true;
2600         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2601                 nfsd_break_one_deleg(dp);
2602         spin_unlock(&recall_lock);
2603 }
2604
2605 static
2606 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2607 {
2608         if (arg & F_UNLCK)
2609                 return lease_modify(onlist, arg);
2610         else
2611                 return -EAGAIN;
2612 }
2613
2614 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2615         .lm_break = nfsd_break_deleg_cb,
2616         .lm_change = nfsd_change_deleg_cb,
2617 };
2618
2619 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2620 {
2621         if (nfsd4_has_session(cstate))
2622                 return nfs_ok;
2623         if (seqid == so->so_seqid - 1)
2624                 return nfserr_replay_me;
2625         if (seqid == so->so_seqid)
2626                 return nfs_ok;
2627         return nfserr_bad_seqid;
2628 }
2629
2630 __be32
2631 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2632                     struct nfsd4_open *open)
2633 {
2634         clientid_t *clientid = &open->op_clientid;
2635         struct nfs4_client *clp = NULL;
2636         unsigned int strhashval;
2637         struct nfs4_openowner *oo = NULL;
2638         __be32 status;
2639         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
2640
2641         if (STALE_CLIENTID(&open->op_clientid, nn))
2642                 return nfserr_stale_clientid;
2643         /*
2644          * In case we need it later, after we've already created the
2645          * file and don't want to risk a further failure:
2646          */
2647         open->op_file = nfsd4_alloc_file();
2648         if (open->op_file == NULL)
2649                 return nfserr_jukebox;
2650
2651         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2652         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2653         open->op_openowner = oo;
2654         if (!oo) {
2655                 clp = find_confirmed_client(clientid, cstate->minorversion,
2656                                             nn);
2657                 if (clp == NULL)
2658                         return nfserr_expired;
2659                 goto new_owner;
2660         }
2661         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2662                 /* Replace unconfirmed owners without checking for replay. */
2663                 clp = oo->oo_owner.so_client;
2664                 release_openowner(oo);
2665                 open->op_openowner = NULL;
2666                 goto new_owner;
2667         }
2668         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2669         if (status)
2670                 return status;
2671         clp = oo->oo_owner.so_client;
2672         goto alloc_stateid;
2673 new_owner:
2674         oo = alloc_init_open_stateowner(strhashval, clp, open);
2675         if (oo == NULL)
2676                 return nfserr_jukebox;
2677         open->op_openowner = oo;
2678 alloc_stateid:
2679         open->op_stp = nfs4_alloc_stateid(clp);
2680         if (!open->op_stp)
2681                 return nfserr_jukebox;
2682         return nfs_ok;
2683 }
2684
2685 static inline __be32
2686 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2687 {
2688         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2689                 return nfserr_openmode;
2690         else
2691                 return nfs_ok;
2692 }
2693
2694 static int share_access_to_flags(u32 share_access)
2695 {
2696         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2697 }
2698
2699 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2700 {
2701         struct nfs4_stid *ret;
2702
2703         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2704         if (!ret)
2705                 return NULL;
2706         return delegstateid(ret);
2707 }
2708
2709 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2710 {
2711         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2712                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2713 }
2714
2715 static __be32
2716 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2717                 struct nfs4_delegation **dp)
2718 {
2719         int flags;
2720         __be32 status = nfserr_bad_stateid;
2721
2722         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2723         if (*dp == NULL)
2724                 goto out;
2725         flags = share_access_to_flags(open->op_share_access);
2726         status = nfs4_check_delegmode(*dp, flags);
2727         if (status)
2728                 *dp = NULL;
2729 out:
2730         if (!nfsd4_is_deleg_cur(open))
2731                 return nfs_ok;
2732         if (status)
2733                 return status;
2734         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2735         return nfs_ok;
2736 }
2737
2738 static __be32
2739 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2740 {
2741         struct nfs4_ol_stateid *local;
2742         struct nfs4_openowner *oo = open->op_openowner;
2743
2744         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2745                 /* ignore lock owners */
2746                 if (local->st_stateowner->so_is_open_owner == 0)
2747                         continue;
2748                 /* remember if we have seen this open owner */
2749                 if (local->st_stateowner == &oo->oo_owner)
2750                         *stpp = local;
2751                 /* check for conflicting share reservations */
2752                 if (!test_share(local, open))
2753                         return nfserr_share_denied;
2754         }
2755         return nfs_ok;
2756 }
2757
2758 static inline int nfs4_access_to_access(u32 nfs4_access)
2759 {
2760         int flags = 0;
2761
2762         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2763                 flags |= NFSD_MAY_READ;
2764         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2765                 flags |= NFSD_MAY_WRITE;
2766         return flags;
2767 }
2768
2769 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2770                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2771 {
2772         __be32 status;
2773         int oflag = nfs4_access_to_omode(open->op_share_access);
2774         int access = nfs4_access_to_access(open->op_share_access);
2775
2776         if (!fp->fi_fds[oflag]) {
2777                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2778                         &fp->fi_fds[oflag]);
2779                 if (status)
2780                         return status;
2781         }
2782         nfs4_file_get_access(fp, oflag);
2783
2784         return nfs_ok;
2785 }
2786
2787 static inline __be32
2788 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2789                 struct nfsd4_open *open)
2790 {
2791         struct iattr iattr = {
2792                 .ia_valid = ATTR_SIZE,
2793                 .ia_size = 0,
2794         };
2795         if (!open->op_truncate)
2796                 return 0;
2797         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2798                 return nfserr_inval;
2799         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2800 }
2801
2802 static __be32
2803 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
2804 {
2805         u32 op_share_access = open->op_share_access;
2806         bool new_access;
2807         __be32 status;
2808
2809         new_access = !test_access(op_share_access, stp);
2810         if (new_access) {
2811                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2812                 if (status)
2813                         return status;
2814         }
2815         status = nfsd4_truncate(rqstp, cur_fh, open);
2816         if (status) {
2817                 if (new_access) {
2818                         int oflag = nfs4_access_to_omode(op_share_access);
2819                         nfs4_file_put_access(fp, oflag);
2820                 }
2821                 return status;
2822         }
2823         /* remember the open */
2824         set_access(op_share_access, stp);
2825         set_deny(open->op_share_deny, stp);
2826
2827         return nfs_ok;
2828 }
2829
2830
2831 static void
2832 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2833 {
2834         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2835 }
2836
2837 /* Should we give out recallable state?: */
2838 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2839 {
2840         if (clp->cl_cb_state == NFSD4_CB_UP)
2841                 return true;
2842         /*
2843          * In the sessions case, since we don't have to establish a
2844          * separate connection for callbacks, we assume it's OK
2845          * until we hear otherwise:
2846          */
2847         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2848 }
2849
2850 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2851 {
2852         struct file_lock *fl;
2853
2854         fl = locks_alloc_lock();
2855         if (!fl)
2856                 return NULL;
2857         locks_init_lock(fl);
2858         fl->fl_lmops = &nfsd_lease_mng_ops;
2859         fl->fl_flags = FL_LEASE;
2860         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2861         fl->fl_end = OFFSET_MAX;
2862         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2863         fl->fl_pid = current->tgid;
2864         return fl;
2865 }
2866
2867 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2868 {
2869         struct nfs4_file *fp = dp->dl_file;
2870         struct file_lock *fl;
2871         int status;
2872
2873         fl = nfs4_alloc_init_lease(dp, flag);
2874         if (!fl)
2875                 return -ENOMEM;
2876         fl->fl_file = find_readable_file(fp);
2877         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2878         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2879         if (status) {
2880                 list_del_init(&dp->dl_perclnt);
2881                 locks_free_lock(fl);
2882                 return -ENOMEM;
2883         }
2884         fp->fi_lease = fl;
2885         fp->fi_deleg_file = get_file(fl->fl_file);
2886         atomic_set(&fp->fi_delegees, 1);
2887         list_add(&dp->dl_perfile, &fp->fi_delegations);
2888         return 0;
2889 }
2890
2891 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2892 {
2893         struct nfs4_file *fp = dp->dl_file;
2894
2895         if (!fp->fi_lease)
2896                 return nfs4_setlease(dp, flag);
2897         spin_lock(&recall_lock);
2898         if (fp->fi_had_conflict) {
2899                 spin_unlock(&recall_lock);
2900                 return -EAGAIN;
2901         }
2902         atomic_inc(&fp->fi_delegees);
2903         list_add(&dp->dl_perfile, &fp->fi_delegations);
2904         spin_unlock(&recall_lock);
2905         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2906         return 0;
2907 }
2908
2909 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2910 {
2911         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2912         if (status == -EAGAIN)
2913                 open->op_why_no_deleg = WND4_CONTENTION;
2914         else {
2915                 open->op_why_no_deleg = WND4_RESOURCE;
2916                 switch (open->op_deleg_want) {
2917                 case NFS4_SHARE_WANT_READ_DELEG:
2918                 case NFS4_SHARE_WANT_WRITE_DELEG:
2919                 case NFS4_SHARE_WANT_ANY_DELEG:
2920                         break;
2921                 case NFS4_SHARE_WANT_CANCEL:
2922                         open->op_why_no_deleg = WND4_CANCELLED;
2923                         break;
2924                 case NFS4_SHARE_WANT_NO_DELEG:
2925                         BUG();  /* not supposed to get here */
2926                 }
2927         }
2928 }
2929
2930 /*
2931  * Attempt to hand out a delegation.
2932  */
2933 static void
2934 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
2935                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2936 {
2937         struct nfs4_delegation *dp;
2938         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2939         int cb_up;
2940         int status = 0, flag = 0;
2941
2942         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2943         flag = NFS4_OPEN_DELEGATE_NONE;
2944         open->op_recall = 0;
2945         switch (open->op_claim_type) {
2946                 case NFS4_OPEN_CLAIM_PREVIOUS:
2947                         if (!cb_up)
2948                                 open->op_recall = 1;
2949                         flag = open->op_delegate_type;
2950                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2951                                 goto out;
2952                         break;
2953                 case NFS4_OPEN_CLAIM_NULL:
2954                         /* Let's not give out any delegations till everyone's
2955                          * had the chance to reclaim theirs.... */
2956                         if (locks_in_grace(net))
2957                                 goto out;
2958                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2959                                 goto out;
2960                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2961                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2962                         else
2963                                 flag = NFS4_OPEN_DELEGATE_READ;
2964                         break;
2965                 default:
2966                         goto out;
2967         }
2968
2969         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2970         if (dp == NULL)
2971                 goto out_no_deleg;
2972         status = nfs4_set_delegation(dp, flag);
2973         if (status)
2974                 goto out_free;
2975
2976         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2977
2978         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2979                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2980 out:
2981         open->op_delegate_type = flag;
2982         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2983                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2984                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2985                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2986
2987                 /* 4.1 client asking for a delegation? */
2988                 if (open->op_deleg_want)
2989                         nfsd4_open_deleg_none_ext(open, status);
2990         }
2991         return;
2992 out_free:
2993         nfs4_put_delegation(dp);
2994 out_no_deleg:
2995         flag = NFS4_OPEN_DELEGATE_NONE;
2996         goto out;
2997 }
2998
2999 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3000                                         struct nfs4_delegation *dp)
3001 {
3002         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3003             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3004                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3005                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3006         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3007                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3008                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3009                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3010         }
3011         /* Otherwise the client must be confused wanting a delegation
3012          * it already has, therefore we don't return
3013          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3014          */
3015 }
3016
3017 /*
3018  * called with nfs4_lock_state() held.
3019  */
3020 __be32
3021 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3022 {
3023         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3024         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3025         struct nfs4_file *fp = NULL;
3026         struct inode *ino = current_fh->fh_dentry->d_inode;
3027         struct nfs4_ol_stateid *stp = NULL;
3028         struct nfs4_delegation *dp = NULL;
3029         __be32 status;
3030
3031         /*
3032          * Lookup file; if found, lookup stateid and check open request,
3033          * and check for delegations in the process of being recalled.
3034          * If not found, create the nfs4_file struct
3035          */
3036         fp = find_file(ino);
3037         if (fp) {
3038                 if ((status = nfs4_check_open(fp, open, &stp)))
3039                         goto out;
3040                 status = nfs4_check_deleg(cl, fp, open, &dp);
3041                 if (status)
3042                         goto out;
3043         } else {
3044                 status = nfserr_bad_stateid;
3045                 if (nfsd4_is_deleg_cur(open))
3046                         goto out;
3047                 status = nfserr_jukebox;
3048                 fp = open->op_file;
3049                 open->op_file = NULL;
3050                 nfsd4_init_file(fp, ino);
3051         }
3052
3053         /*
3054          * OPEN the file, or upgrade an existing OPEN.
3055          * If truncate fails, the OPEN fails.
3056          */
3057         if (stp) {
3058                 /* Stateid was found, this is an OPEN upgrade */
3059                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3060                 if (status)
3061                         goto out;
3062         } else {
3063                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3064                 if (status)
3065                         goto out;
3066                 status = nfsd4_truncate(rqstp, current_fh, open);
3067                 if (status)
3068                         goto out;
3069                 stp = open->op_stp;
3070                 open->op_stp = NULL;
3071                 init_open_stateid(stp, fp, open);
3072         }
3073         update_stateid(&stp->st_stid.sc_stateid);
3074         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3075
3076         if (nfsd4_has_session(&resp->cstate)) {
3077                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3078
3079                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3080                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3081                         open->op_why_no_deleg = WND4_NOT_WANTED;
3082                         goto nodeleg;
3083                 }
3084         }
3085
3086         /*
3087         * Attempt to hand out a delegation. No error return, because the
3088         * OPEN succeeds even if we fail.
3089         */
3090         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3091 nodeleg:
3092         status = nfs_ok;
3093
3094         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3095                 STATEID_VAL(&stp->st_stid.sc_stateid));
3096 out:
3097         /* 4.1 client trying to upgrade/downgrade delegation? */
3098         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3099             open->op_deleg_want)
3100                 nfsd4_deleg_xgrade_none_ext(open, dp);
3101
3102         if (fp)
3103                 put_nfs4_file(fp);
3104         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3105                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3106         /*
3107         * To finish the open response, we just need to set the rflags.
3108         */
3109         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3110         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3111             !nfsd4_has_session(&resp->cstate))
3112                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3113
3114         return status;
3115 }
3116
3117 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3118 {
3119         if (open->op_openowner) {
3120                 struct nfs4_openowner *oo = open->op_openowner;
3121
3122                 if (!list_empty(&oo->oo_owner.so_stateids))
3123                         list_del_init(&oo->oo_close_lru);
3124                 if (oo->oo_flags & NFS4_OO_NEW) {
3125                         if (status) {
3126                                 release_openowner(oo);
3127                                 open->op_openowner = NULL;
3128                         } else
3129                                 oo->oo_flags &= ~NFS4_OO_NEW;
3130                 }
3131         }
3132         if (open->op_file)
3133                 nfsd4_free_file(open->op_file);
3134         if (open->op_stp)
3135                 free_generic_stateid(open->op_stp);
3136 }
3137
3138 __be32
3139 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3140             clientid_t *clid)
3141 {
3142         struct nfs4_client *clp;
3143         __be32 status;
3144         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3145
3146         nfs4_lock_state();
3147         dprintk("process_renew(%08x/%08x): starting\n",
3148                         clid->cl_boot, clid->cl_id);
3149         status = nfserr_stale_clientid;
3150         if (STALE_CLIENTID(clid, nn))
3151                 goto out;
3152         clp = find_confirmed_client(clid, cstate->minorversion, nn);
3153         status = nfserr_expired;
3154         if (clp == NULL) {
3155                 /* We assume the client took too long to RENEW. */
3156                 dprintk("nfsd4_renew: clientid not found!\n");
3157                 goto out;
3158         }
3159         status = nfserr_cb_path_down;
3160         if (!list_empty(&clp->cl_delegations)
3161                         && clp->cl_cb_state != NFSD4_CB_UP)
3162                 goto out;
3163         status = nfs_ok;
3164 out:
3165         nfs4_unlock_state();
3166         return status;
3167 }
3168
3169 static void
3170 nfsd4_end_grace(struct net *net)
3171 {
3172         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3173
3174         /* do nothing if grace period already ended */
3175         if (nn->grace_ended)
3176                 return;
3177
3178         dprintk("NFSD: end of grace period\n");
3179         nn->grace_ended = true;
3180         nfsd4_record_grace_done(net, nn->boot_time);
3181         locks_end_grace(&nn->nfsd4_manager);
3182         /*
3183          * Now that every NFSv4 client has had the chance to recover and
3184          * to see the (possibly new, possibly shorter) lease time, we
3185          * can safely set the next grace time to the current lease time:
3186          */
3187         nfsd4_grace = nfsd4_lease;
3188 }
3189
3190 static time_t
3191 nfs4_laundromat(void)
3192 {
3193         struct nfs4_client *clp;
3194         struct nfs4_openowner *oo;
3195         struct nfs4_delegation *dp;
3196         struct list_head *pos, *next, reaplist;
3197         time_t cutoff = get_seconds() - nfsd4_lease;
3198         time_t t, clientid_val = nfsd4_lease;
3199         time_t u, test_val = nfsd4_lease;
3200
3201         nfs4_lock_state();
3202
3203         dprintk("NFSD: laundromat service - starting\n");
3204         nfsd4_end_grace(&init_net);
3205         INIT_LIST_HEAD(&reaplist);
3206         spin_lock(&client_lock);
3207         list_for_each_safe(pos, next, &client_lru) {
3208                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3209                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3210                         t = clp->cl_time - cutoff;
3211                         if (clientid_val > t)
3212                                 clientid_val = t;
3213                         break;
3214                 }
3215                 if (atomic_read(&clp->cl_refcount)) {
3216                         dprintk("NFSD: client in use (clientid %08x)\n",
3217                                 clp->cl_clientid.cl_id);
3218                         continue;
3219                 }
3220                 unhash_client_locked(clp);
3221                 list_add(&clp->cl_lru, &reaplist);
3222         }
3223         spin_unlock(&client_lock);
3224         list_for_each_safe(pos, next, &reaplist) {
3225                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3226                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3227                         clp->cl_clientid.cl_id);
3228                 expire_client(clp);
3229         }
3230         spin_lock(&recall_lock);
3231         list_for_each_safe(pos, next, &del_recall_lru) {
3232                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3233                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3234                         u = dp->dl_time - cutoff;
3235                         if (test_val > u)
3236                                 test_val = u;
3237                         break;
3238                 }
3239                 list_move(&dp->dl_recall_lru, &reaplist);
3240         }
3241         spin_unlock(&recall_lock);
3242         list_for_each_safe(pos, next, &reaplist) {
3243                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3244                 unhash_delegation(dp);
3245         }
3246         test_val = nfsd4_lease;
3247         list_for_each_safe(pos, next, &close_lru) {
3248                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3249                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3250                         u = oo->oo_time - cutoff;
3251                         if (test_val > u)
3252                                 test_val = u;
3253                         break;
3254                 }
3255                 release_openowner(oo);
3256         }
3257         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3258                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3259         nfs4_unlock_state();
3260         return clientid_val;
3261 }
3262
3263 static struct workqueue_struct *laundry_wq;
3264 static void laundromat_main(struct work_struct *);
3265 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3266
3267 static void
3268 laundromat_main(struct work_struct *not_used)
3269 {
3270         time_t t;
3271
3272         t = nfs4_laundromat();
3273         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3274         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3275 }
3276
3277 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3278 {
3279         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3280                 return nfserr_bad_stateid;
3281         return nfs_ok;
3282 }
3283
3284 static int
3285 STALE_STATEID(stateid_t *stateid, struct nfsd_net *nn)
3286 {
3287         if (stateid->si_opaque.so_clid.cl_boot == nn->boot_time)
3288                 return 0;
3289         dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3290                 STATEID_VAL(stateid));
3291         return 1;
3292 }
3293
3294 static inline int
3295 access_permit_read(struct nfs4_ol_stateid *stp)
3296 {
3297         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3298                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3299                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3300 }
3301
3302 static inline int
3303 access_permit_write(struct nfs4_ol_stateid *stp)
3304 {
3305         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3306                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3307 }
3308
3309 static
3310 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3311 {
3312         __be32 status = nfserr_openmode;
3313
3314         /* For lock stateid's, we test the parent open, not the lock: */
3315         if (stp->st_openstp)
3316                 stp = stp->st_openstp;
3317         if ((flags & WR_STATE) && !access_permit_write(stp))
3318                 goto out;
3319         if ((flags & RD_STATE) && !access_permit_read(stp))
3320                 goto out;
3321         status = nfs_ok;
3322 out:
3323         return status;
3324 }
3325
3326 static inline __be32
3327 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3328 {
3329         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3330                 return nfs_ok;
3331         else if (locks_in_grace(net)) {
3332                 /* Answer in remaining cases depends on existence of
3333                  * conflicting state; so we must wait out the grace period. */
3334                 return nfserr_grace;
3335         } else if (flags & WR_STATE)
3336                 return nfs4_share_conflict(current_fh,
3337                                 NFS4_SHARE_DENY_WRITE);
3338         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3339                 return nfs4_share_conflict(current_fh,
3340                                 NFS4_SHARE_DENY_READ);
3341 }
3342
3343 /*
3344  * Allow READ/WRITE during grace period on recovered state only for files
3345  * that are not able to provide mandatory locking.
3346  */
3347 static inline int
3348 grace_disallows_io(struct net *net, struct inode *inode)
3349 {
3350         return locks_in_grace(net) && mandatory_lock(inode);
3351 }
3352
3353 /* Returns true iff a is later than b: */
3354 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3355 {
3356         return (s32)a->si_generation - (s32)b->si_generation > 0;
3357 }
3358
3359 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3360 {
3361         /*
3362          * When sessions are used the stateid generation number is ignored
3363          * when it is zero.
3364          */
3365         if (has_session && in->si_generation == 0)
3366                 return nfs_ok;
3367
3368         if (in->si_generation == ref->si_generation)
3369                 return nfs_ok;
3370
3371         /* If the client sends us a stateid from the future, it's buggy: */
3372         if (stateid_generation_after(in, ref))
3373                 return nfserr_bad_stateid;
3374         /*
3375          * However, we could see a stateid from the past, even from a
3376          * non-buggy client.  For example, if the client sends a lock
3377          * while some IO is outstanding, the lock may bump si_generation
3378          * while the IO is still in flight.  The client could avoid that
3379          * situation by waiting for responses on all the IO requests,
3380          * but better performance may result in retrying IO that
3381          * receives an old_stateid error if requests are rarely
3382          * reordered in flight:
3383          */
3384         return nfserr_old_stateid;
3385 }
3386
3387 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3388 {
3389         struct nfs4_stid *s;
3390         struct nfs4_ol_stateid *ols;
3391         __be32 status;
3392
3393         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3394                 return nfserr_bad_stateid;
3395         /* Client debugging aid. */
3396         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3397                 char addr_str[INET6_ADDRSTRLEN];
3398                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3399                                  sizeof(addr_str));
3400                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3401                                         "with incorrect client ID\n", addr_str);
3402                 return nfserr_bad_stateid;
3403         }
3404         s = find_stateid(cl, stateid);
3405         if (!s)
3406                 return nfserr_bad_stateid;
3407         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3408         if (status)
3409                 return status;
3410         if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3411                 return nfs_ok;
3412         ols = openlockstateid(s);
3413         if (ols->st_stateowner->so_is_open_owner
3414             && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3415                 return nfserr_bad_stateid;
3416         return nfs_ok;
3417 }
3418
3419 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s, bool sessions)
3420 {
3421         struct nfs4_client *cl;
3422         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
3423
3424         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3425                 return nfserr_bad_stateid;
3426         if (STALE_STATEID(stateid, nn))
3427                 return nfserr_stale_stateid;
3428         cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions, nn);
3429         if (!cl)
3430                 return nfserr_expired;
3431         *s = find_stateid_by_type(cl, stateid, typemask);
3432         if (!*s)
3433                 return nfserr_bad_stateid;
3434         return nfs_ok;
3435
3436 }
3437
3438 /*
3439 * Checks for stateid operations
3440 */
3441 __be32
3442 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3443                            stateid_t *stateid, int flags, struct file **filpp)
3444 {
3445         struct nfs4_stid *s;
3446         struct nfs4_ol_stateid *stp = NULL;
3447         struct nfs4_delegation *dp = NULL;
3448         struct svc_fh *current_fh = &cstate->current_fh;
3449         struct inode *ino = current_fh->fh_dentry->d_inode;
3450         __be32 status;
3451
3452         if (filpp)
3453                 *filpp = NULL;
3454
3455         if (grace_disallows_io(net, ino))
3456                 return nfserr_grace;
3457
3458         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3459                 return check_special_stateids(net, current_fh, stateid, flags);
3460
3461         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s, cstate->minorversion);
3462         if (status)
3463                 return status;
3464         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3465         if (status)
3466                 goto out;
3467         switch (s->sc_type) {
3468         case NFS4_DELEG_STID:
3469                 dp = delegstateid(s);
3470                 status = nfs4_check_delegmode(dp, flags);
3471                 if (status)
3472                         goto out;
3473                 if (filpp) {
3474                         *filpp = dp->dl_file->fi_deleg_file;
3475                         BUG_ON(!*filpp);
3476                 }
3477                 break;
3478         case NFS4_OPEN_STID:
3479         case NFS4_LOCK_STID:
3480                 stp = openlockstateid(s);
3481                 status = nfs4_check_fh(current_fh, stp);
3482                 if (status)
3483                         goto out;
3484                 if (stp->st_stateowner->so_is_open_owner
3485                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3486                         goto out;
3487                 status = nfs4_check_openmode(stp, flags);
3488                 if (status)
3489                         goto out;
3490                 if (filpp) {
3491                         if (flags & RD_STATE)
3492                                 *filpp = find_readable_file(stp->st_file);
3493                         else
3494                                 *filpp = find_writeable_file(stp->st_file);
3495                 }
3496                 break;
3497         default:
3498                 return nfserr_bad_stateid;
3499         }
3500         status = nfs_ok;
3501 out:
3502         return status;
3503 }
3504
3505 static __be32
3506 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3507 {
3508         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3509                 return nfserr_locks_held;
3510         release_lock_stateid(stp);
3511         return nfs_ok;
3512 }
3513
3514 /*
3515  * Test if the stateid is valid
3516  */
3517 __be32
3518 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3519                    struct nfsd4_test_stateid *test_stateid)
3520 {
3521         struct nfsd4_test_stateid_id *stateid;
3522         struct nfs4_client *cl = cstate->session->se_client;
3523
3524         nfs4_lock_state();
3525         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3526                 stateid->ts_id_status =
3527                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3528         nfs4_unlock_state();
3529
3530         return nfs_ok;
3531 }
3532
3533 __be32
3534 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3535                    struct nfsd4_free_stateid *free_stateid)
3536 {
3537         stateid_t *stateid = &free_stateid->fr_stateid;
3538         struct nfs4_stid *s;
3539         struct nfs4_client *cl = cstate->session->se_client;
3540         __be32 ret = nfserr_bad_stateid;
3541
3542         nfs4_lock_state();
3543         s = find_stateid(cl, stateid);
3544         if (!s)
3545                 goto out;
3546         switch (s->sc_type) {
3547         case NFS4_DELEG_STID:
3548                 ret = nfserr_locks_held;
3549                 goto out;
3550         case NFS4_OPEN_STID:
3551         case NFS4_LOCK_STID:
3552                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3553                 if (ret)
3554                         goto out;
3555                 if (s->sc_type == NFS4_LOCK_STID)
3556                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3557                 else
3558                         ret = nfserr_locks_held;
3559                 break;
3560         default:
3561                 ret = nfserr_bad_stateid;
3562         }
3563 out:
3564         nfs4_unlock_state();
3565         return ret;
3566 }
3567
3568 static inline int
3569 setlkflg (int type)
3570 {
3571         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3572                 RD_STATE : WR_STATE;
3573 }
3574
3575 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3576 {
3577         struct svc_fh *current_fh = &cstate->current_fh;
3578         struct nfs4_stateowner *sop = stp->st_stateowner;
3579         __be32 status;
3580
3581         status = nfsd4_check_seqid(cstate, sop, seqid);
3582         if (status)
3583                 return status;
3584         if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3585                 /*
3586                  * "Closed" stateid's exist *only* to return
3587                  * nfserr_replay_me from the previous step.
3588                  */
3589                 return nfserr_bad_stateid;
3590         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3591         if (status)
3592                 return status;
3593         return nfs4_check_fh(current_fh, stp);
3594 }
3595
3596 /*
3597  * Checks for sequence id mutating operations.
3598  */
3599 static __be32
3600 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3601                          stateid_t *stateid, char typemask,
3602                          struct nfs4_ol_stateid **stpp)
3603 {
3604         __be32 status;
3605         struct nfs4_stid *s;
3606
3607         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3608                 seqid, STATEID_VAL(stateid));
3609
3610         *stpp = NULL;
3611         status = nfsd4_lookup_stateid(stateid, typemask, &s, cstate->minorversion);
3612         if (status)
3613                 return status;
3614         *stpp = openlockstateid(s);
3615         cstate->replay_owner = (*stpp)->st_stateowner;
3616
3617         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3618 }
3619
3620 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3621 {
3622         __be32 status;
3623         struct nfs4_openowner *oo;
3624
3625         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3626                                                 NFS4_OPEN_STID, stpp);
3627         if (status)
3628                 return status;
3629         oo = openowner((*stpp)->st_stateowner);
3630         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3631                 return nfserr_bad_stateid;
3632         return nfs_ok;
3633 }
3634
3635 __be32
3636 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3637                    struct nfsd4_open_confirm *oc)
3638 {
3639         __be32 status;
3640         struct nfs4_openowner *oo;
3641         struct nfs4_ol_stateid *stp;
3642
3643         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3644                         (int)cstate->current_fh.fh_dentry->d_name.len,
3645                         cstate->current_fh.fh_dentry->d_name.name);
3646
3647         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3648         if (status)
3649                 return status;
3650
3651         nfs4_lock_state();
3652
3653         status = nfs4_preprocess_seqid_op(cstate,
3654                                         oc->oc_seqid, &oc->oc_req_stateid,
3655                                         NFS4_OPEN_STID, &stp);
3656         if (status)
3657                 goto out;
3658         oo = openowner(stp->st_stateowner);
3659         status = nfserr_bad_stateid;
3660         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3661                 goto out;
3662         oo->oo_flags |= NFS4_OO_CONFIRMED;
3663         update_stateid(&stp->st_stid.sc_stateid);
3664         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3665         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3666                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3667
3668         nfsd4_client_record_create(oo->oo_owner.so_client);
3669         status = nfs_ok;
3670 out:
3671         if (!cstate->replay_owner)
3672                 nfs4_unlock_state();
3673         return status;
3674 }
3675
3676 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3677 {
3678         if (!test_access(access, stp))
3679                 return;
3680         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3681         clear_access(access, stp);
3682 }
3683
3684 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3685 {
3686         switch (to_access) {
3687         case NFS4_SHARE_ACCESS_READ:
3688                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3689                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3690                 break;
3691         case NFS4_SHARE_ACCESS_WRITE:
3692                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3693                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3694                 break;
3695         case NFS4_SHARE_ACCESS_BOTH:
3696                 break;
3697         default:
3698                 BUG();
3699         }
3700 }
3701
3702 static void
3703 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3704 {
3705         int i;
3706         for (i = 0; i < 4; i++) {
3707                 if ((i & deny) != i)
3708                         clear_deny(i, stp);
3709         }
3710 }
3711
3712 __be32
3713 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3714                      struct nfsd4_compound_state *cstate,
3715                      struct nfsd4_open_downgrade *od)
3716 {
3717         __be32 status;
3718         struct nfs4_ol_stateid *stp;
3719
3720         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3721                         (int)cstate->current_fh.fh_dentry->d_name.len,
3722                         cstate->current_fh.fh_dentry->d_name.name);
3723
3724         /* We don't yet support WANT bits: */
3725         if (od->od_deleg_want)
3726                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3727                         od->od_deleg_want);
3728
3729         nfs4_lock_state();
3730         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3731                                         &od->od_stateid, &stp);
3732         if (status)
3733                 goto out;
3734         status = nfserr_inval;
3735         if (!test_access(od->od_share_access, stp)) {
3736                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3737                         stp->st_access_bmap, od->od_share_access);
3738                 goto out;
3739         }
3740         if (!test_deny(od->od_share_deny, stp)) {
3741                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3742                         stp->st_deny_bmap, od->od_share_deny);
3743                 goto out;
3744         }
3745         nfs4_stateid_downgrade(stp, od->od_share_access);
3746
3747         reset_union_bmap_deny(od->od_share_deny, stp);
3748
3749         update_stateid(&stp->st_stid.sc_stateid);
3750         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3751         status = nfs_ok;
3752 out:
3753         if (!cstate->replay_owner)
3754                 nfs4_unlock_state();
3755         return status;
3756 }
3757
3758 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3759 {
3760         struct nfs4_openowner *oo;
3761         struct nfs4_ol_stateid *s;
3762
3763         if (!so->so_is_open_owner)
3764                 return;
3765         oo = openowner(so);
3766         s = oo->oo_last_closed_stid;
3767         if (!s)
3768                 return;
3769         if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3770                 /* Release the last_closed_stid on the next seqid bump: */
3771                 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3772                 return;
3773         }
3774         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3775         release_last_closed_stateid(oo);
3776 }
3777
3778 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3779 {
3780         unhash_open_stateid(s);
3781         s->st_stid.sc_type = NFS4_CLOSED_STID;
3782 }
3783
3784 /*
3785  * nfs4_unlock_state() called after encode
3786  */
3787 __be32
3788 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3789             struct nfsd4_close *close)
3790 {
3791         __be32 status;
3792         struct nfs4_openowner *oo;
3793         struct nfs4_ol_stateid *stp;
3794
3795         dprintk("NFSD: nfsd4_close on file %.*s\n",
3796                         (int)cstate->current_fh.fh_dentry->d_name.len,
3797                         cstate->current_fh.fh_dentry->d_name.name);
3798
3799         nfs4_lock_state();
3800         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3801                                         &close->cl_stateid,
3802                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3803                                         &stp);
3804         if (status)
3805                 goto out;
3806         oo = openowner(stp->st_stateowner);
3807         status = nfs_ok;
3808         update_stateid(&stp->st_stid.sc_stateid);
3809         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3810
3811         nfsd4_close_open_stateid(stp);
3812         release_last_closed_stateid(oo);
3813         oo->oo_last_closed_stid = stp;
3814
3815         if (list_empty(&oo->oo_owner.so_stateids)) {
3816                 if (cstate->minorversion) {
3817                         release_openowner(oo);
3818                         cstate->replay_owner = NULL;
3819                 } else {
3820                         /*
3821                          * In the 4.0 case we need to keep the owners around a
3822                          * little while to handle CLOSE replay.
3823                          */
3824                         if (list_empty(&oo->oo_owner.so_stateids))
3825                                 move_to_close_lru(oo);
3826                 }
3827         }
3828 out:
3829         if (!cstate->replay_owner)
3830                 nfs4_unlock_state();
3831         return status;
3832 }
3833
3834 __be32
3835 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3836                   struct nfsd4_delegreturn *dr)
3837 {
3838         struct nfs4_delegation *dp;
3839         stateid_t *stateid = &dr->dr_stateid;
3840         struct nfs4_stid *s;
3841         __be32 status;
3842
3843         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3844                 return status;
3845
3846         nfs4_lock_state();
3847         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s, cstate->minorversion);
3848         if (status)
3849                 goto out;
3850         dp = delegstateid(s);
3851         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3852         if (status)
3853                 goto out;
3854
3855         unhash_delegation(dp);
3856 out:
3857         nfs4_unlock_state();
3858
3859         return status;
3860 }
3861
3862
3863 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
3864
3865 #define LOCKOWNER_INO_HASH_BITS 8
3866 #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3867 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3868
3869 static inline u64
3870 end_offset(u64 start, u64 len)
3871 {
3872         u64 end;
3873
3874         end = start + len;
3875         return end >= start ? end: NFS4_MAX_UINT64;
3876 }
3877
3878 /* last octet in a range */
3879 static inline u64
3880 last_byte_offset(u64 start, u64 len)
3881 {
3882         u64 end;
3883
3884         BUG_ON(!len);
3885         end = start + len;
3886         return end > start ? end - 1: NFS4_MAX_UINT64;
3887 }
3888
3889 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3890 {
3891         return (file_hashval(inode) + cl_id
3892                         + opaque_hashval(ownername->data, ownername->len))
3893                 & LOCKOWNER_INO_HASH_MASK;
3894 }
3895
3896 static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
3897
3898 /*
3899  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3900  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3901  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
3902  * locking, this prevents us from being completely protocol-compliant.  The
3903  * real solution to this problem is to start using unsigned file offsets in
3904  * the VFS, but this is a very deep change!
3905  */
3906 static inline void
3907 nfs4_transform_lock_offset(struct file_lock *lock)
3908 {
3909         if (lock->fl_start < 0)
3910                 lock->fl_start = OFFSET_MAX;
3911         if (lock->fl_end < 0)
3912                 lock->fl_end = OFFSET_MAX;
3913 }
3914
3915 /* Hack!: For now, we're defining this just so we can use a pointer to it
3916  * as a unique cookie to identify our (NFSv4's) posix locks. */
3917 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
3918 };
3919
3920 static inline void
3921 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3922 {
3923         struct nfs4_lockowner *lo;
3924
3925         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3926                 lo = (struct nfs4_lockowner *) fl->fl_owner;
3927                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3928                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
3929                 if (!deny->ld_owner.data)
3930                         /* We just don't care that much */
3931                         goto nevermind;
3932                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3933                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3934         } else {
3935 nevermind:
3936                 deny->ld_owner.len = 0;
3937                 deny->ld_owner.data = NULL;
3938                 deny->ld_clientid.cl_boot = 0;
3939                 deny->ld_clientid.cl_id = 0;
3940         }
3941         deny->ld_start = fl->fl_start;
3942         deny->ld_length = NFS4_MAX_UINT64;
3943         if (fl->fl_end != NFS4_MAX_UINT64)
3944                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3945         deny->ld_type = NFS4_READ_LT;
3946         if (fl->fl_type != F_RDLCK)
3947                 deny->ld_type = NFS4_WRITE_LT;
3948 }
3949
3950 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3951 {
3952         struct nfs4_ol_stateid *lst;
3953
3954         if (!same_owner_str(&lo->lo_owner, owner, clid))
3955                 return false;
3956         lst = list_first_entry(&lo->lo_owner.so_stateids,
3957                                struct nfs4_ol_stateid, st_perstateowner);
3958         return lst->st_file->fi_inode == inode;
3959 }
3960
3961 static struct nfs4_lockowner *
3962 find_lockowner_str(struct inode *inode, clientid_t *clid,
3963                 struct xdr_netobj *owner)
3964 {
3965         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3966         struct nfs4_lockowner *lo;
3967
3968         list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3969                 if (same_lockowner_ino(lo, inode, clid, owner))
3970                         return lo;
3971         }
3972         return NULL;
3973 }
3974
3975 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3976 {
3977         struct inode *inode = open_stp->st_file->fi_inode;
3978         unsigned int inohash = lockowner_ino_hashval(inode,
3979                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3980         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3981
3982         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
3983         list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
3984         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3985 }
3986
3987 /*
3988  * Alloc a lock owner structure.
3989  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3990  * occurred.
3991  *
3992  * strhashval = ownerstr_hashval
3993  */
3994
3995 static struct nfs4_lockowner *
3996 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3997         struct nfs4_lockowner *lo;
3998
3999         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4000         if (!lo)
4001                 return NULL;
4002         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4003         lo->lo_owner.so_is_open_owner = 0;
4004         /* It is the openowner seqid that will be incremented in encode in the
4005          * case of new lockowners; so increment the lock seqid manually: */
4006         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4007         hash_lockowner(lo, strhashval, clp, open_stp);
4008         return lo;
4009 }
4010
4011 static struct nfs4_ol_stateid *
4012 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4013 {
4014         struct nfs4_ol_stateid *stp;
4015         struct nfs4_client *clp = lo->lo_owner.so_client;
4016
4017         stp = nfs4_alloc_stateid(clp);
4018         if (stp == NULL)
4019                 return NULL;
4020         init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
4021         list_add(&stp->st_perfile, &fp->fi_stateids);
4022         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4023         stp->st_stateowner = &lo->lo_owner;
4024         get_nfs4_file(fp);
4025         stp->st_file = fp;
4026         stp->st_access_bmap = 0;
4027         stp->st_deny_bmap = open_stp->st_deny_bmap;
4028         stp->st_openstp = open_stp;
4029         return stp;
4030 }
4031
4032 static int
4033 check_lock_length(u64 offset, u64 length)
4034 {
4035         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4036              LOFF_OVERFLOW(offset, length)));
4037 }
4038
4039 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4040 {
4041         struct nfs4_file *fp = lock_stp->st_file;
4042         int oflag = nfs4_access_to_omode(access);
4043
4044         if (test_access(access, lock_stp))
4045                 return;
4046         nfs4_file_get_access(fp, oflag);
4047         set_access(access, lock_stp);
4048 }
4049
4050 static __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)
4051 {
4052         struct nfs4_file *fi = ost->st_file;
4053         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4054         struct nfs4_client *cl = oo->oo_owner.so_client;
4055         struct nfs4_lockowner *lo;
4056         unsigned int strhashval;
4057
4058         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
4059         if (lo) {
4060                 if (!cstate->minorversion)
4061                         return nfserr_bad_seqid;
4062                 /* XXX: a lockowner always has exactly one stateid: */
4063                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4064                                 struct nfs4_ol_stateid, st_perstateowner);
4065                 return nfs_ok;
4066         }
4067         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4068                         &lock->v.new.owner);
4069         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4070         if (lo == NULL)
4071                 return nfserr_jukebox;
4072         *lst = alloc_init_lock_stateid(lo, fi, ost);
4073         if (*lst == NULL) {
4074                 release_lockowner(lo);
4075                 return nfserr_jukebox;
4076         }
4077         *new = true;
4078         return nfs_ok;
4079 }
4080
4081 /*
4082  *  LOCK operation
4083  */
4084 __be32
4085 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4086            struct nfsd4_lock *lock)
4087 {
4088         struct nfs4_openowner *open_sop = NULL;
4089         struct nfs4_lockowner *lock_sop = NULL;
4090         struct nfs4_ol_stateid *lock_stp;
4091         struct file *filp = NULL;
4092         struct file_lock *file_lock = NULL;
4093         struct file_lock *conflock = NULL;
4094         __be32 status = 0;
4095         bool new_state = false;
4096         int lkflg;
4097         int err;
4098         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4099
4100         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4101                 (long long) lock->lk_offset,
4102                 (long long) lock->lk_length);
4103
4104         if (check_lock_length(lock->lk_offset, lock->lk_length))
4105                  return nfserr_inval;
4106
4107         if ((status = fh_verify(rqstp, &cstate->current_fh,
4108                                 S_IFREG, NFSD_MAY_LOCK))) {
4109                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4110                 return status;
4111         }
4112
4113         nfs4_lock_state();
4114
4115         if (lock->lk_is_new) {
4116                 struct nfs4_ol_stateid *open_stp = NULL;
4117
4118                 if (nfsd4_has_session(cstate))
4119                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4120                         memcpy(&lock->v.new.clientid,
4121                                 &cstate->session->se_client->cl_clientid,
4122                                 sizeof(clientid_t));
4123
4124                 status = nfserr_stale_clientid;
4125                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4126                         goto out;
4127
4128                 /* validate and update open stateid and open seqid */
4129                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4130                                         lock->lk_new_open_seqid,
4131                                         &lock->lk_new_open_stateid,
4132                                         &open_stp);
4133                 if (status)
4134                         goto out;
4135                 open_sop = openowner(open_stp->st_stateowner);
4136                 status = nfserr_bad_stateid;
4137                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4138                                                 &lock->v.new.clientid))
4139                         goto out;
4140                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4141                                                         &lock_stp, &new_state);
4142         } else
4143                 status = nfs4_preprocess_seqid_op(cstate,
4144                                        lock->lk_old_lock_seqid,
4145                                        &lock->lk_old_lock_stateid,
4146                                        NFS4_LOCK_STID, &lock_stp);
4147         if (status)
4148                 goto out;
4149         lock_sop = lockowner(lock_stp->st_stateowner);
4150
4151         lkflg = setlkflg(lock->lk_type);
4152         status = nfs4_check_openmode(lock_stp, lkflg);
4153         if (status)
4154                 goto out;
4155
4156         status = nfserr_grace;
4157         if (locks_in_grace(SVC_NET(rqstp)) && !lock->lk_reclaim)
4158                 goto out;
4159         status = nfserr_no_grace;
4160         if (!locks_in_grace(SVC_NET(rqstp)) && lock->lk_reclaim)
4161                 goto out;
4162
4163         file_lock = locks_alloc_lock();
4164         if (!file_lock) {
4165                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4166                 status = nfserr_jukebox;
4167                 goto out;
4168         }
4169
4170         locks_init_lock(file_lock);
4171         switch (lock->lk_type) {
4172                 case NFS4_READ_LT:
4173                 case NFS4_READW_LT:
4174                         filp = find_readable_file(lock_stp->st_file);
4175                         if (filp)
4176                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4177                         file_lock->fl_type = F_RDLCK;
4178                         break;
4179                 case NFS4_WRITE_LT:
4180                 case NFS4_WRITEW_LT:
4181                         filp = find_writeable_file(lock_stp->st_file);
4182                         if (filp)
4183                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4184                         file_lock->fl_type = F_WRLCK;
4185                         break;
4186                 default:
4187                         status = nfserr_inval;
4188                 goto out;
4189         }
4190         if (!filp) {
4191                 status = nfserr_openmode;
4192                 goto out;
4193         }
4194         file_lock->fl_owner = (fl_owner_t)lock_sop;
4195         file_lock->fl_pid = current->tgid;
4196         file_lock->fl_file = filp;
4197         file_lock->fl_flags = FL_POSIX;
4198         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4199         file_lock->fl_start = lock->lk_offset;
4200         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4201         nfs4_transform_lock_offset(file_lock);
4202
4203         conflock = locks_alloc_lock();
4204         if (!conflock) {
4205                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4206                 status = nfserr_jukebox;
4207                 goto out;
4208         }
4209
4210         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4211         switch (-err) {
4212         case 0: /* success! */
4213                 update_stateid(&lock_stp->st_stid.sc_stateid);
4214                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4215                                 sizeof(stateid_t));
4216                 status = 0;
4217                 break;
4218         case (EAGAIN):          /* conflock holds conflicting lock */
4219                 status = nfserr_denied;
4220                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4221                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4222                 break;
4223         case (EDEADLK):
4224                 status = nfserr_deadlock;
4225                 break;
4226         default:
4227                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4228                 status = nfserrno(err);
4229                 break;
4230         }
4231 out:
4232         if (status && new_state)
4233                 release_lockowner(lock_sop);
4234         if (!cstate->replay_owner)
4235                 nfs4_unlock_state();
4236         if (file_lock)
4237                 locks_free_lock(file_lock);
4238         if (conflock)
4239                 locks_free_lock(conflock);
4240         return status;
4241 }
4242
4243 /*
4244  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4245  * so we do a temporary open here just to get an open file to pass to
4246  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4247  * inode operation.)
4248  */
4249 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4250 {
4251         struct file *file;
4252         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4253         if (!err) {
4254                 err = nfserrno(vfs_test_lock(file, lock));
4255                 nfsd_close(file);
4256         }
4257         return err;
4258 }
4259
4260 /*
4261  * LOCKT operation
4262  */
4263 __be32
4264 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4265             struct nfsd4_lockt *lockt)
4266 {
4267         struct inode *inode;
4268         struct file_lock *file_lock = NULL;
4269         struct nfs4_lockowner *lo;
4270         __be32 status;
4271         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4272
4273         if (locks_in_grace(SVC_NET(rqstp)))
4274                 return nfserr_grace;
4275
4276         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4277                  return nfserr_inval;
4278
4279         nfs4_lock_state();
4280
4281         status = nfserr_stale_clientid;
4282         if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid, nn))
4283                 goto out;
4284
4285         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4286                 goto out;
4287
4288         inode = cstate->current_fh.fh_dentry->d_inode;
4289         file_lock = locks_alloc_lock();
4290         if (!file_lock) {
4291                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4292                 status = nfserr_jukebox;
4293                 goto out;
4294         }
4295         locks_init_lock(file_lock);
4296         switch (lockt->lt_type) {
4297                 case NFS4_READ_LT:
4298                 case NFS4_READW_LT:
4299                         file_lock->fl_type = F_RDLCK;
4300                 break;
4301                 case NFS4_WRITE_LT:
4302                 case NFS4_WRITEW_LT:
4303                         file_lock->fl_type = F_WRLCK;
4304                 break;
4305                 default:
4306                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4307                         status = nfserr_inval;
4308                 goto out;
4309         }
4310
4311         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4312         if (lo)
4313                 file_lock->fl_owner = (fl_owner_t)lo;
4314         file_lock->fl_pid = current->tgid;
4315         file_lock->fl_flags = FL_POSIX;
4316
4317         file_lock->fl_start = lockt->lt_offset;
4318         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4319
4320         nfs4_transform_lock_offset(file_lock);
4321
4322         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4323         if (status)
4324                 goto out;
4325
4326         if (file_lock->fl_type != F_UNLCK) {
4327                 status = nfserr_denied;
4328                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4329         }
4330 out:
4331         nfs4_unlock_state();
4332         if (file_lock)
4333                 locks_free_lock(file_lock);
4334         return status;
4335 }
4336
4337 __be32
4338 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4339             struct nfsd4_locku *locku)
4340 {
4341         struct nfs4_ol_stateid *stp;
4342         struct file *filp = NULL;
4343         struct file_lock *file_lock = NULL;
4344         __be32 status;
4345         int err;
4346
4347         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4348                 (long long) locku->lu_offset,
4349                 (long long) locku->lu_length);
4350
4351         if (check_lock_length(locku->lu_offset, locku->lu_length))
4352                  return nfserr_inval;
4353
4354         nfs4_lock_state();
4355
4356         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4357                                         &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4358         if (status)
4359                 goto out;
4360         filp = find_any_file(stp->st_file);
4361         if (!filp) {
4362                 status = nfserr_lock_range;
4363                 goto out;
4364         }
4365         file_lock = locks_alloc_lock();
4366         if (!file_lock) {
4367                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4368                 status = nfserr_jukebox;
4369                 goto out;
4370         }
4371         locks_init_lock(file_lock);
4372         file_lock->fl_type = F_UNLCK;
4373         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4374         file_lock->fl_pid = current->tgid;
4375         file_lock->fl_file = filp;
4376         file_lock->fl_flags = FL_POSIX;
4377         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4378         file_lock->fl_start = locku->lu_offset;
4379
4380         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4381                                                 locku->lu_length);
4382         nfs4_transform_lock_offset(file_lock);
4383
4384         /*
4385         *  Try to unlock the file in the VFS.
4386         */
4387         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4388         if (err) {
4389                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4390                 goto out_nfserr;
4391         }
4392         /*
4393         * OK, unlock succeeded; the only thing left to do is update the stateid.
4394         */
4395         update_stateid(&stp->st_stid.sc_stateid);
4396         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4397
4398 out:
4399         if (!cstate->replay_owner)
4400                 nfs4_unlock_state();
4401         if (file_lock)
4402                 locks_free_lock(file_lock);
4403         return status;
4404
4405 out_nfserr:
4406         status = nfserrno(err);
4407         goto out;
4408 }
4409
4410 /*
4411  * returns
4412  *      1: locks held by lockowner
4413  *      0: no locks held by lockowner
4414  */
4415 static int
4416 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4417 {
4418         struct file_lock **flpp;
4419         struct inode *inode = filp->fi_inode;
4420         int status = 0;
4421
4422         lock_flocks();
4423         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4424                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4425                         status = 1;
4426                         goto out;
4427                 }
4428         }
4429 out:
4430         unlock_flocks();
4431         return status;
4432 }
4433
4434 __be32
4435 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4436                         struct nfsd4_compound_state *cstate,
4437                         struct nfsd4_release_lockowner *rlockowner)
4438 {
4439         clientid_t *clid = &rlockowner->rl_clientid;
4440         struct nfs4_stateowner *sop;
4441         struct nfs4_lockowner *lo;
4442         struct nfs4_ol_stateid *stp;
4443         struct xdr_netobj *owner = &rlockowner->rl_owner;
4444         struct list_head matches;
4445         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4446         __be32 status;
4447         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4448
4449         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4450                 clid->cl_boot, clid->cl_id);
4451
4452         /* XXX check for lease expiration */
4453
4454         status = nfserr_stale_clientid;
4455         if (STALE_CLIENTID(clid, nn))
4456                 return status;
4457
4458         nfs4_lock_state();
4459
4460         status = nfserr_locks_held;
4461         INIT_LIST_HEAD(&matches);
4462
4463         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4464                 if (sop->so_is_open_owner)
4465                         continue;
4466                 if (!same_owner_str(sop, owner, clid))
4467                         continue;
4468                 list_for_each_entry(stp, &sop->so_stateids,
4469                                 st_perstateowner) {
4470                         lo = lockowner(sop);
4471                         if (check_for_locks(stp->st_file, lo))
4472                                 goto out;
4473                         list_add(&lo->lo_list, &matches);
4474                 }
4475         }
4476         /* Clients probably won't expect us to return with some (but not all)
4477          * of the lockowner state released; so don't release any until all
4478          * have been checked. */
4479         status = nfs_ok;
4480         while (!list_empty(&matches)) {
4481                 lo = list_entry(matches.next, struct nfs4_lockowner,
4482                                                                 lo_list);
4483                 /* unhash_stateowner deletes so_perclient only
4484                  * for openowners. */
4485                 list_del(&lo->lo_list);
4486                 release_lockowner(lo);
4487         }
4488 out:
4489         nfs4_unlock_state();
4490         return status;
4491 }
4492
4493 static inline struct nfs4_client_reclaim *
4494 alloc_reclaim(void)
4495 {
4496         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4497 }
4498
4499 bool
4500 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4501 {
4502         struct nfs4_client_reclaim *crp;
4503
4504         crp = nfsd4_find_reclaim_client(name, nn);
4505         return (crp && crp->cr_clp);
4506 }
4507
4508 /*
4509  * failure => all reset bets are off, nfserr_no_grace...
4510  */
4511 struct nfs4_client_reclaim *
4512 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4513 {
4514         unsigned int strhashval;
4515         struct nfs4_client_reclaim *crp;
4516
4517         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4518         crp = alloc_reclaim();
4519         if (crp) {
4520                 strhashval = clientstr_hashval(name);
4521                 INIT_LIST_HEAD(&crp->cr_strhash);
4522                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4523                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4524                 crp->cr_clp = NULL;
4525                 nn->reclaim_str_hashtbl_size++;
4526         }
4527         return crp;
4528 }
4529
4530 void
4531 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4532 {
4533         list_del(&crp->cr_strhash);
4534         kfree(crp);
4535         nn->reclaim_str_hashtbl_size--;
4536 }
4537
4538 void
4539 nfs4_release_reclaim(struct nfsd_net *nn)
4540 {
4541         struct nfs4_client_reclaim *crp = NULL;
4542         int i;
4543
4544         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4545                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4546                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4547                                         struct nfs4_client_reclaim, cr_strhash);
4548                         nfs4_remove_reclaim_record(crp, nn);
4549                 }
4550         }
4551         BUG_ON(nn->reclaim_str_hashtbl_size);
4552 }
4553
4554 /*
4555  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4556 struct nfs4_client_reclaim *
4557 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4558 {
4559         unsigned int strhashval;
4560         struct nfs4_client_reclaim *crp = NULL;
4561
4562         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4563
4564         strhashval = clientstr_hashval(recdir);
4565         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4566                 if (same_name(crp->cr_recdir, recdir)) {
4567                         return crp;
4568                 }
4569         }
4570         return NULL;
4571 }
4572
4573 /*
4574 * Called from OPEN. Look for clientid in reclaim list.
4575 */
4576 __be32
4577 nfs4_check_open_reclaim(clientid_t *clid, bool sessions)
4578 {
4579         struct nfs4_client *clp;
4580         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4581
4582         /* find clientid in conf_id_hashtbl */
4583         clp = find_confirmed_client(clid, sessions, nn);
4584         if (clp == NULL)
4585                 return nfserr_reclaim_bad;
4586
4587         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4588 }
4589
4590 #ifdef CONFIG_NFSD_FAULT_INJECTION
4591
4592 void nfsd_forget_clients(u64 num)
4593 {
4594         struct nfs4_client *clp, *next;
4595         int count = 0;
4596
4597         nfs4_lock_state();
4598         list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
4599                 expire_client(clp);
4600                 if (++count == num)
4601                         break;
4602         }
4603         nfs4_unlock_state();
4604
4605         printk(KERN_INFO "NFSD: Forgot %d clients", count);
4606 }
4607
4608 static void release_lockowner_sop(struct nfs4_stateowner *sop)
4609 {
4610         release_lockowner(lockowner(sop));
4611 }
4612
4613 static void release_openowner_sop(struct nfs4_stateowner *sop)
4614 {
4615         release_openowner(openowner(sop));
4616 }
4617
4618 static int nfsd_release_n_owners(u64 num, bool is_open_owner,
4619                                 void (*release_sop)(struct nfs4_stateowner *),
4620                                 struct nfsd_net *nn)
4621 {
4622         int i, count = 0;
4623         struct nfs4_stateowner *sop, *next;
4624
4625         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4626                 list_for_each_entry_safe(sop, next, &nn->ownerstr_hashtbl[i], so_strhash) {
4627                         if (sop->so_is_open_owner != is_open_owner)
4628                                 continue;
4629                         release_sop(sop);
4630                         if (++count == num)
4631                                 return count;
4632                 }
4633         }
4634         return count;
4635 }
4636
4637 void nfsd_forget_locks(u64 num)
4638 {
4639         int count;
4640         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4641
4642         nfs4_lock_state();
4643         count = nfsd_release_n_owners(num, false, release_lockowner_sop, nn);
4644         nfs4_unlock_state();
4645
4646         printk(KERN_INFO "NFSD: Forgot %d locks", count);
4647 }
4648
4649 void nfsd_forget_openowners(u64 num)
4650 {
4651         int count;
4652         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4653
4654         nfs4_lock_state();
4655         count = nfsd_release_n_owners(num, true, release_openowner_sop, nn);
4656         nfs4_unlock_state();
4657
4658         printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4659 }
4660
4661 static int nfsd_process_n_delegations(u64 num, struct list_head *list)
4662 {
4663         int i, count = 0;
4664         struct nfs4_file *fp, *fnext;
4665         struct nfs4_delegation *dp, *dnext;
4666
4667         for (i = 0; i < FILE_HASH_SIZE; i++) {
4668                 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4669                         list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
4670                                 list_move(&dp->dl_recall_lru, list);
4671                                 if (++count == num)
4672                                         return count;
4673                         }
4674                 }
4675         }
4676
4677         return count;
4678 }
4679
4680 void nfsd_forget_delegations(u64 num)
4681 {
4682         unsigned int count;
4683         LIST_HEAD(victims);
4684         struct nfs4_delegation *dp, *dnext;
4685
4686         spin_lock(&recall_lock);
4687         count = nfsd_process_n_delegations(num, &victims);
4688         spin_unlock(&recall_lock);
4689
4690         nfs4_lock_state();
4691         list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru)
4692                 unhash_delegation(dp);
4693         nfs4_unlock_state();
4694
4695         printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4696 }
4697
4698 void nfsd_recall_delegations(u64 num)
4699 {
4700         unsigned int count;
4701         LIST_HEAD(victims);
4702         struct nfs4_delegation *dp, *dnext;
4703
4704         spin_lock(&recall_lock);
4705         count = nfsd_process_n_delegations(num, &victims);
4706         list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru) {
4707                 list_del(&dp->dl_recall_lru);
4708                 nfsd_break_one_deleg(dp);
4709         }
4710         spin_unlock(&recall_lock);
4711
4712         printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4713 }
4714
4715 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4716
4717 /* initialization to perform at module load time: */
4718
4719 void
4720 nfs4_state_init(void)
4721 {
4722         int i;
4723
4724         for (i = 0; i < SESSION_HASH_SIZE; i++)
4725                 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4726         for (i = 0; i < FILE_HASH_SIZE; i++) {
4727                 INIT_LIST_HEAD(&file_hashtbl[i]);
4728         }
4729         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4730                 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
4731         INIT_LIST_HEAD(&close_lru);
4732         INIT_LIST_HEAD(&client_lru);
4733         INIT_LIST_HEAD(&del_recall_lru);
4734 }
4735
4736 /*
4737  * Since the lifetime of a delegation isn't limited to that of an open, a
4738  * client may quite reasonably hang on to a delegation as long as it has
4739  * the inode cached.  This becomes an obvious problem the first time a
4740  * client's inode cache approaches the size of the server's total memory.
4741  *
4742  * For now we avoid this problem by imposing a hard limit on the number
4743  * of delegations, which varies according to the server's memory size.
4744  */
4745 static void
4746 set_max_delegations(void)
4747 {
4748         /*
4749          * Allow at most 4 delegations per megabyte of RAM.  Quick
4750          * estimates suggest that in the worst case (where every delegation
4751          * is for a different inode), a delegation could take about 1.5K,
4752          * giving a worst case usage of about 6% of memory.
4753          */
4754         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4755 }
4756
4757 static int nfs4_state_start_net(struct net *net)
4758 {
4759         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4760         int i;
4761
4762         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4763                         CLIENT_HASH_SIZE, GFP_KERNEL);
4764         if (!nn->conf_id_hashtbl)
4765                 goto err;
4766         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4767                         CLIENT_HASH_SIZE, GFP_KERNEL);
4768         if (!nn->unconf_id_hashtbl)
4769                 goto err_unconf_id;
4770         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
4771                         OWNER_HASH_SIZE, GFP_KERNEL);
4772         if (!nn->ownerstr_hashtbl)
4773                 goto err_ownerstr;
4774
4775         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4776                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
4777                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
4778         }
4779         for (i = 0; i < OWNER_HASH_SIZE; i++)
4780                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
4781         nn->conf_name_tree = RB_ROOT;
4782         nn->unconf_name_tree = RB_ROOT;
4783
4784         return 0;
4785
4786 err_ownerstr:
4787         kfree(nn->unconf_id_hashtbl);
4788 err_unconf_id:
4789         kfree(nn->conf_id_hashtbl);
4790 err:
4791         return -ENOMEM;
4792 }
4793
4794 static void
4795 __nfs4_state_shutdown_net(struct net *net)
4796 {
4797         int i;
4798         struct nfs4_client *clp = NULL;
4799         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4800         struct rb_node *node, *tmp;
4801
4802         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4803                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
4804                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4805                         destroy_client(clp);
4806                 }
4807         }
4808
4809         node = rb_first(&nn->unconf_name_tree);
4810         while (node != NULL) {
4811                 tmp = node;
4812                 node = rb_next(tmp);
4813                 clp = rb_entry(tmp, struct nfs4_client, cl_namenode);
4814                 rb_erase(tmp, &nn->unconf_name_tree);
4815                 destroy_client(clp);
4816         }
4817
4818         kfree(nn->ownerstr_hashtbl);
4819         kfree(nn->unconf_id_hashtbl);
4820         kfree(nn->conf_id_hashtbl);
4821 }
4822
4823 /* initialization to perform when the nfsd service is started: */
4824
4825 int
4826 nfs4_state_start(void)
4827 {
4828         struct net *net = &init_net;
4829         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4830         int ret;
4831
4832         /*
4833          * FIXME: For now, we hang most of the pernet global stuff off of
4834          * init_net until nfsd is fully containerized. Eventually, we'll
4835          * need to pass a net pointer into this function, take a reference
4836          * to that instead and then do most of the rest of this on a per-net
4837          * basis.
4838          */
4839         get_net(net);
4840         ret = nfs4_state_start_net(net);
4841         if (ret)
4842                 return ret;
4843         nfsd4_client_tracking_init(net);
4844         nn->boot_time = get_seconds();
4845         locks_start_grace(net, &nn->nfsd4_manager);
4846         nn->grace_ended = false;
4847         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4848                nfsd4_grace);
4849         ret = set_callback_cred();
4850         if (ret) {
4851                 ret = -ENOMEM;
4852                 goto out_recovery;
4853         }
4854         laundry_wq = create_singlethread_workqueue("nfsd4");
4855         if (laundry_wq == NULL) {
4856                 ret = -ENOMEM;
4857                 goto out_recovery;
4858         }
4859         ret = nfsd4_create_callback_queue();
4860         if (ret)
4861                 goto out_free_laundry;
4862         queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4863         set_max_delegations();
4864         return 0;
4865 out_free_laundry:
4866         destroy_workqueue(laundry_wq);
4867 out_recovery:
4868         nfsd4_client_tracking_exit(net);
4869         __nfs4_state_shutdown_net(net);
4870         put_net(net);
4871         return ret;
4872 }
4873
4874 /* should be called with the state lock held */
4875 static void
4876 __nfs4_state_shutdown(struct net *net)
4877 {
4878         struct nfs4_delegation *dp = NULL;
4879         struct list_head *pos, *next, reaplist;
4880
4881         __nfs4_state_shutdown_net(net);
4882
4883         INIT_LIST_HEAD(&reaplist);
4884         spin_lock(&recall_lock);
4885         list_for_each_safe(pos, next, &del_recall_lru) {
4886                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4887                 list_move(&dp->dl_recall_lru, &reaplist);
4888         }
4889         spin_unlock(&recall_lock);
4890         list_for_each_safe(pos, next, &reaplist) {
4891                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4892                 unhash_delegation(dp);
4893         }
4894
4895         nfsd4_client_tracking_exit(&init_net);
4896         put_net(&init_net);
4897 }
4898
4899 void
4900 nfs4_state_shutdown(void)
4901 {
4902         struct net *net = &init_net;
4903         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4904
4905         cancel_delayed_work_sync(&laundromat_work);
4906         destroy_workqueue(laundry_wq);
4907         locks_end_grace(&nn->nfsd4_manager);
4908         nfs4_lock_state();
4909         __nfs4_state_shutdown(net);
4910         nfs4_unlock_state();
4911         nfsd4_destroy_callback_queue();
4912 }
4913
4914 static void
4915 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4916 {
4917         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4918                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4919 }
4920
4921 static void
4922 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4923 {
4924         if (cstate->minorversion) {
4925                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4926                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4927         }
4928 }
4929
4930 void
4931 clear_current_stateid(struct nfsd4_compound_state *cstate)
4932 {
4933         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4934 }
4935
4936 /*
4937  * functions to set current state id
4938  */
4939 void
4940 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4941 {
4942         put_stateid(cstate, &odp->od_stateid);
4943 }
4944
4945 void
4946 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4947 {
4948         put_stateid(cstate, &open->op_stateid);
4949 }
4950
4951 void
4952 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4953 {
4954         put_stateid(cstate, &close->cl_stateid);
4955 }
4956
4957 void
4958 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4959 {
4960         put_stateid(cstate, &lock->lk_resp_stateid);
4961 }
4962
4963 /*
4964  * functions to consume current state id
4965  */
4966
4967 void
4968 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4969 {
4970         get_stateid(cstate, &odp->od_stateid);
4971 }
4972
4973 void
4974 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4975 {
4976         get_stateid(cstate, &drp->dr_stateid);
4977 }
4978
4979 void
4980 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4981 {
4982         get_stateid(cstate, &fsp->fr_stateid);
4983 }
4984
4985 void
4986 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4987 {
4988         get_stateid(cstate, &setattr->sa_stateid);
4989 }
4990
4991 void
4992 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4993 {
4994         get_stateid(cstate, &close->cl_stateid);
4995 }
4996
4997 void
4998 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
4999 {
5000         get_stateid(cstate, &locku->lu_stateid);
5001 }
5002
5003 void
5004 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5005 {
5006         get_stateid(cstate, &read->rd_stateid);
5007 }
5008
5009 void
5010 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5011 {
5012         get_stateid(cstate, &write->wr_stateid);
5013 }