Pileus Git - ~andy/linux/blob - 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/sunrpc/svcauth_gss.h>
  42 #include <linux/sunrpc/clnt.h>
  43 #include "xdr4.h"
  44 #include "vfs.h"
  45 #include "current_stateid.h"
  46
  47 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  48
  49 /* Globals */
  50 time_t nfsd4_lease = 90;     /* default lease time */
  51 time_t nfsd4_grace = 90;
  52 static time_t boot_time;
  53
  54 #define all_ones {{~0,~0},~0}
  55 static const stateid_t one_stateid = {
  56         .si_generation = ~0,
  57         .si_opaque = all_ones,
  58 };
  59 static const stateid_t zero_stateid = {
  60         /* all fields zero */
  61 };
  62 static const stateid_t currentstateid = {
  63         .si_generation = 1,
  64 };
  65
  66 static u64 current_sessionid = 1;
  67
  68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  70 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  71
  72 /* forward declarations */
  73 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  74
  75 /* Locking: */
  76
  77 /* Currently used for almost all code touching nfsv4 state: */
  78 static DEFINE_MUTEX(client_mutex);
  79
  80 /*
  81  * Currently used for the del_recall_lru and file hash table.  In an
  82  * effort to decrease the scope of the client_mutex, this spinlock may
  83  * eventually cover more:
  84  */
  85 static DEFINE_SPINLOCK(recall_lock);
  86
  87 static struct kmem_cache *openowner_slab = NULL;
  88 static struct kmem_cache *lockowner_slab = NULL;
  89 static struct kmem_cache *file_slab = NULL;
  90 static struct kmem_cache *stateid_slab = NULL;
  91 static struct kmem_cache *deleg_slab = NULL;
  92
  93 void
  94 nfs4_lock_state(void)
  95 {
  96         mutex_lock(&client_mutex);
  97 }
  98
  99 static void free_session(struct kref *);
 100
 101 /* Must be called under the client_lock */
 102 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 103 {
 104         kref_put(&ses->se_ref, free_session);
 105 }
 106
 107 static void nfsd4_get_session(struct nfsd4_session *ses)
 108 {
 109         kref_get(&ses->se_ref);
 110 }
 111
 112 void
 113 nfs4_unlock_state(void)
 114 {
 115         mutex_unlock(&client_mutex);
 116 }
 117
 118 static inline u32
 119 opaque_hashval(const void *ptr, int nbytes)
 120 {
 121         unsigned char *cptr = (unsigned char *) ptr;
 122
 123         u32 x = 0;
 124         while (nbytes--) {
 125                 x *= 37;
 126                 x += *cptr++;
 127         }
 128         return x;
 129 }
 130
 131 static struct list_head del_recall_lru;
 132
 133 static void nfsd4_free_file(struct nfs4_file *f)
 134 {
 135         kmem_cache_free(file_slab, f);
 136 }
 137
 138 static inline void
 139 put_nfs4_file(struct nfs4_file *fi)
 140 {
 141         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 142                 list_del(&fi->fi_hash);
 143                 spin_unlock(&recall_lock);
 144                 iput(fi->fi_inode);
 145                 nfsd4_free_file(fi);
 146         }
 147 }
 148
 149 static inline void
 150 get_nfs4_file(struct nfs4_file *fi)
 151 {
 152         atomic_inc(&fi->fi_ref);
 153 }
 154
 155 static int num_delegations;
 156 unsigned int max_delegations;
 157
 158 /*
 159  * Open owner state (share locks)
 160  */
 161
 162 /* hash tables for lock and open owners */
 163 #define OWNER_HASH_BITS              8
 164 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 165 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 166
 167 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 168 {
 169         unsigned int ret;
 170
 171         ret = opaque_hashval(ownername->data, ownername->len);
 172         ret += clientid;
 173         return ret & OWNER_HASH_MASK;
 174 }
 175
 176 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 177
 178 /* hash table for nfs4_file */
 179 #define FILE_HASH_BITS                   8
 180 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 181
 182 static unsigned int file_hashval(struct inode *ino)
 183 {
 184         /* XXX: why are we hashing on inode pointer, anyway? */
 185         return hash_ptr(ino, FILE_HASH_BITS);
 186 }
 187
 188 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 189
 190 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 191 {
 192         BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 193         atomic_inc(&fp->fi_access[oflag]);
 194 }
 195
 196 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 197 {
 198         if (oflag == O_RDWR) {
 199                 __nfs4_file_get_access(fp, O_RDONLY);
 200                 __nfs4_file_get_access(fp, O_WRONLY);
 201         } else
 202                 __nfs4_file_get_access(fp, oflag);
 203 }
 204
 205 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 206 {
 207         if (fp->fi_fds[oflag]) {
 208                 fput(fp->fi_fds[oflag]);
 209                 fp->fi_fds[oflag] = NULL;
 210         }
 211 }
 212
 213 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 214 {
 215         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 216                 nfs4_file_put_fd(fp, oflag);
 217                 /*
 218                  * It's also safe to get rid of the RDWR open *if*
 219                  * we no longer have need of the other kind of access
 220                  * or if we already have the other kind of open:
 221                  */
 222                 if (fp->fi_fds[1-oflag]
 223                         || atomic_read(&fp->fi_access[1 - oflag]) == 0)
 224                         nfs4_file_put_fd(fp, O_RDWR);
 225         }
 226 }
 227
 228 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 229 {
 230         if (oflag == O_RDWR) {
 231                 __nfs4_file_put_access(fp, O_RDONLY);
 232                 __nfs4_file_put_access(fp, O_WRONLY);
 233         } else
 234                 __nfs4_file_put_access(fp, oflag);
 235 }
 236
 237 static inline int get_new_stid(struct nfs4_stid *stid)
 238 {
 239         static int min_stateid = 0;
 240         struct idr *stateids = &stid->sc_client->cl_stateids;
 241         int new_stid;
 242         int error;
 243
 244         error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
 245         /*
 246          * Note: the necessary preallocation was done in
 247          * nfs4_alloc_stateid().  The idr code caps the number of
 248          * preallocations that can exist at a time, but the state lock
 249          * prevents anyone from using ours before we get here:
 250          */
 251         BUG_ON(error);
 252         /*
 253          * It shouldn't be a problem to reuse an opaque stateid value.
 254          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 255          * example, a stray write retransmission could be accepted by
 256          * the server when it should have been rejected.  Therefore,
 257          * adopt a trick from the sctp code to attempt to maximize the
 258          * amount of time until an id is reused, by ensuring they always
 259          * "increase" (mod INT_MAX):
 260          */
 261
 262         min_stateid = new_stid+1;
 263         if (min_stateid == INT_MAX)
 264                 min_stateid = 0;
 265         return new_stid;
 266 }
 267
 268 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
 269 {
 270         stateid_t *s = &stid->sc_stateid;
 271         int new_id;
 272
 273         stid->sc_type = type;
 274         stid->sc_client = cl;
 275         s->si_opaque.so_clid = cl->cl_clientid;
 276         new_id = get_new_stid(stid);
 277         s->si_opaque.so_id = (u32)new_id;
 278         /* Will be incremented before return to client: */
 279         s->si_generation = 0;
 280 }
 281
 282 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
 283 {
 284         struct idr *stateids = &cl->cl_stateids;
 285
 286         if (!idr_pre_get(stateids, GFP_KERNEL))
 287                 return NULL;
 288         /*
 289          * Note: if we fail here (or any time between now and the time
 290          * we actually get the new idr), we won't need to undo the idr
 291          * preallocation, since the idr code caps the number of
 292          * preallocated entries.
 293          */
 294         return kmem_cache_alloc(slab, GFP_KERNEL);
 295 }
 296
 297 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 298 {
 299         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 300 }
 301
 302 static struct nfs4_delegation *
 303 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
 304 {
 305         struct nfs4_delegation *dp;
 306         struct nfs4_file *fp = stp->st_file;
 307
 308         dprintk("NFSD alloc_init_deleg\n");
 309         /*
 310          * Major work on the lease subsystem (for example, to support
 311          * calbacks on stat) will be required before we can support
 312          * write delegations properly.
 313          */
 314         if (type != NFS4_OPEN_DELEGATE_READ)
 315                 return NULL;
 316         if (fp->fi_had_conflict)
 317                 return NULL;
 318         if (num_delegations > max_delegations)
 319                 return NULL;
 320         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 321         if (dp == NULL)
 322                 return dp;
 323         init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
 324         /*
 325          * delegation seqid's are never incremented.  The 4.1 special
 326          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 327          * 0 anyway just for consistency and use 1:
 328          */
 329         dp->dl_stid.sc_stateid.si_generation = 1;
 330         num_delegations++;
 331         INIT_LIST_HEAD(&dp->dl_perfile);
 332         INIT_LIST_HEAD(&dp->dl_perclnt);
 333         INIT_LIST_HEAD(&dp->dl_recall_lru);
 334         get_nfs4_file(fp);
 335         dp->dl_file = fp;
 336         dp->dl_type = type;
 337         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 338         dp->dl_time = 0;
 339         atomic_set(&dp->dl_count, 1);
 340         INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
 341         return dp;
 342 }
 343
 344 void
 345 nfs4_put_delegation(struct nfs4_delegation *dp)
 346 {
 347         if (atomic_dec_and_test(&dp->dl_count)) {
 348                 dprintk("NFSD: freeing dp %p\n",dp);
 349                 put_nfs4_file(dp->dl_file);
 350                 kmem_cache_free(deleg_slab, dp);
 351                 num_delegations--;
 352         }
 353 }
 354
 355 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 356 {
 357         if (atomic_dec_and_test(&fp->fi_delegees)) {
 358                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 359                 fp->fi_lease = NULL;
 360                 fput(fp->fi_deleg_file);
 361                 fp->fi_deleg_file = NULL;
 362         }
 363 }
 364
 365 static void unhash_stid(struct nfs4_stid *s)
 366 {
 367         struct idr *stateids = &s->sc_client->cl_stateids;
 368
 369         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 370 }
 371
 372 /* Called under the state lock. */
 373 static void
 374 unhash_delegation(struct nfs4_delegation *dp)
 375 {
 376         unhash_stid(&dp->dl_stid);
 377         list_del_init(&dp->dl_perclnt);
 378         spin_lock(&recall_lock);
 379         list_del_init(&dp->dl_perfile);
 380         list_del_init(&dp->dl_recall_lru);
 381         spin_unlock(&recall_lock);
 382         nfs4_put_deleg_lease(dp->dl_file);
 383         nfs4_put_delegation(dp);
 384 }
 385
 386 /*
 387  * SETCLIENTID state
 388  */
 389
 390 /* client_lock protects the client lru list and session hash table */
 391 static DEFINE_SPINLOCK(client_lock);
 392
 393 /* Hash tables for nfs4_clientid state */
 394 #define CLIENT_HASH_BITS                 4
 395 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 396 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 397
 398 static unsigned int clientid_hashval(u32 id)
 399 {
 400         return id & CLIENT_HASH_MASK;
 401 }
 402
 403 static unsigned int clientstr_hashval(const char *name)
 404 {
 405         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 406 }
 407
 408 /*
 409  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 410  * used in reboot/reset lease grace period processing
 411  *
 412  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 413  * setclientid_confirmed info.
 414  *
 415  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 416  * setclientid info.
 417  *
 418  * client_lru holds client queue ordered by nfs4_client.cl_time
 419  * for lease renewal.
 420  *
 421  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 422  * for last close replay.
 423  */
 424 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 425 static int reclaim_str_hashtbl_size = 0;
 426 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 427 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 428 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 429 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 430 static struct list_head client_lru;
 431 static struct list_head close_lru;
 432
 433 /*
 434  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 435  * st_{access,deny}_bmap field of the stateid, in order to track not
 436  * only what share bits are currently in force, but also what
 437  * combinations of share bits previous opens have used.  This allows us
 438  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 439  * return an error if the client attempt to downgrade to a combination
 440  * of share bits not explicable by closing some of its previous opens.
 441  *
 442  * XXX: This enforcement is actually incomplete, since we don't keep
 443  * track of access/deny bit combinations; so, e.g., we allow:
 444  *
 445  *      OPEN allow read, deny write
 446  *      OPEN allow both, deny none
 447  *      DOWNGRADE allow read, deny none
 448  *
 449  * which we should reject.
 450  */
 451 static unsigned int
 452 bmap_to_share_mode(unsigned long bmap) {
 453         int i;
 454         unsigned int access = 0;
 455
 456         for (i = 1; i < 4; i++) {
 457                 if (test_bit(i, &bmap))
 458                         access |= i;
 459         }
 460         return access;
 461 }
 462
 463 static bool
 464 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 465         unsigned int access, deny;
 466
 467         access = bmap_to_share_mode(stp->st_access_bmap);
 468         deny = bmap_to_share_mode(stp->st_deny_bmap);
 469         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 470                 return false;
 471         return true;
 472 }
 473
 474 /* set share access for a given stateid */
 475 static inline void
 476 set_access(u32 access, struct nfs4_ol_stateid *stp)
 477 {
 478         __set_bit(access, &stp->st_access_bmap);
 479 }
 480
 481 /* clear share access for a given stateid */
 482 static inline void
 483 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 484 {
 485         __clear_bit(access, &stp->st_access_bmap);
 486 }
 487
 488 /* test whether a given stateid has access */
 489 static inline bool
 490 test_access(u32 access, struct nfs4_ol_stateid *stp)
 491 {
 492         return test_bit(access, &stp->st_access_bmap);
 493 }
 494
 495 /* set share deny for a given stateid */
 496 static inline void
 497 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 498 {
 499         __set_bit(access, &stp->st_deny_bmap);
 500 }
 501
 502 /* clear share deny for a given stateid */
 503 static inline void
 504 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 505 {
 506         __clear_bit(access, &stp->st_deny_bmap);
 507 }
 508
 509 /* test whether a given stateid is denying specific access */
 510 static inline bool
 511 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 512 {
 513         return test_bit(access, &stp->st_deny_bmap);
 514 }
 515
 516 static int nfs4_access_to_omode(u32 access)
 517 {
 518         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 519         case NFS4_SHARE_ACCESS_READ:
 520                 return O_RDONLY;
 521         case NFS4_SHARE_ACCESS_WRITE:
 522                 return O_WRONLY;
 523         case NFS4_SHARE_ACCESS_BOTH:
 524                 return O_RDWR;
 525         }
 526         BUG();
 527 }
 528
 529 /* release all access and file references for a given stateid */
 530 static void
 531 release_all_access(struct nfs4_ol_stateid *stp)
 532 {
 533         int i;
 534
 535         for (i = 1; i < 4; i++) {
 536                 if (test_access(i, stp))
 537                         nfs4_file_put_access(stp->st_file,
 538                                              nfs4_access_to_omode(i));
 539                 clear_access(i, stp);
 540         }
 541 }
 542
 543 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 544 {
 545         list_del(&stp->st_perfile);
 546         list_del(&stp->st_perstateowner);
 547 }
 548
 549 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 550 {
 551         release_all_access(stp);
 552         put_nfs4_file(stp->st_file);
 553         stp->st_file = NULL;
 554 }
 555
 556 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 557 {
 558         kmem_cache_free(stateid_slab, stp);
 559 }
 560
 561 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 562 {
 563         struct file *file;
 564
 565         unhash_generic_stateid(stp);
 566         unhash_stid(&stp->st_stid);
 567         file = find_any_file(stp->st_file);
 568         if (file)
 569                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 570         close_generic_stateid(stp);
 571         free_generic_stateid(stp);
 572 }
 573
 574 static void unhash_lockowner(struct nfs4_lockowner *lo)
 575 {
 576         struct nfs4_ol_stateid *stp;
 577
 578         list_del(&lo->lo_owner.so_strhash);
 579         list_del(&lo->lo_perstateid);
 580         list_del(&lo->lo_owner_ino_hash);
 581         while (!list_empty(&lo->lo_owner.so_stateids)) {
 582                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 583                                 struct nfs4_ol_stateid, st_perstateowner);
 584                 release_lock_stateid(stp);
 585         }
 586 }
 587
 588 static void release_lockowner(struct nfs4_lockowner *lo)
 589 {
 590         unhash_lockowner(lo);
 591         nfs4_free_lockowner(lo);
 592 }
 593
 594 static void
 595 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 596 {
 597         struct nfs4_lockowner *lo;
 598
 599         while (!list_empty(&open_stp->st_lockowners)) {
 600                 lo = list_entry(open_stp->st_lockowners.next,
 601                                 struct nfs4_lockowner, lo_perstateid);
 602                 release_lockowner(lo);
 603         }
 604 }
 605
 606 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 607 {
 608         unhash_generic_stateid(stp);
 609         release_stateid_lockowners(stp);
 610         close_generic_stateid(stp);
 611 }
 612
 613 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 614 {
 615         unhash_open_stateid(stp);
 616         unhash_stid(&stp->st_stid);
 617         free_generic_stateid(stp);
 618 }
 619
 620 static void unhash_openowner(struct nfs4_openowner *oo)
 621 {
 622         struct nfs4_ol_stateid *stp;
 623
 624         list_del(&oo->oo_owner.so_strhash);
 625         list_del(&oo->oo_perclient);
 626         while (!list_empty(&oo->oo_owner.so_stateids)) {
 627                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 628                                 struct nfs4_ol_stateid, st_perstateowner);
 629                 release_open_stateid(stp);
 630         }
 631 }
 632
 633 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 634 {
 635         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 636
 637         if (s) {
 638                 unhash_stid(&s->st_stid);
 639                 free_generic_stateid(s);
 640                 oo->oo_last_closed_stid = NULL;
 641         }
 642 }
 643
 644 static void release_openowner(struct nfs4_openowner *oo)
 645 {
 646         unhash_openowner(oo);
 647         list_del(&oo->oo_close_lru);
 648         release_last_closed_stateid(oo);
 649         nfs4_free_openowner(oo);
 650 }
 651
 652 #define SESSION_HASH_SIZE       512
 653 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
 654
 655 static inline int
 656 hash_sessionid(struct nfs4_sessionid *sessionid)
 657 {
 658         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 659
 660         return sid->sequence % SESSION_HASH_SIZE;
 661 }
 662
 663 #ifdef NFSD_DEBUG
 664 static inline void
 665 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 666 {
 667         u32 *ptr = (u32 *)(&sessionid->data[0]);
 668         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 669 }
 670 #else
 671 static inline void
 672 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 673 {
 674 }
 675 #endif
 676
 677
 678 static void
 679 gen_sessionid(struct nfsd4_session *ses)
 680 {
 681         struct nfs4_client *clp = ses->se_client;
 682         struct nfsd4_sessionid *sid;
 683
 684         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 685         sid->clientid = clp->cl_clientid;
 686         sid->sequence = current_sessionid++;
 687         sid->reserved = 0;
 688 }
 689
 690 /*
 691  * The protocol defines ca_maxresponssize_cached to include the size of
 692  * the rpc header, but all we need to cache is the data starting after
 693  * the end of the initial SEQUENCE operation--the rest we regenerate
 694  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 695  * value that is the number of bytes in our cache plus a few additional
 696  * bytes.  In order to stay on the safe side, and not promise more than
 697  * we can cache, those additional bytes must be the minimum possible: 24
 698  * bytes of rpc header (xid through accept state, with AUTH_NULL
 699  * verifier), 12 for the compound header (with zero-length tag), and 44
 700  * for the SEQUENCE op response:
 701  */
 702 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 703
 704 static void
 705 free_session_slots(struct nfsd4_session *ses)
 706 {
 707         int i;
 708
 709         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 710                 kfree(ses->se_slots[i]);
 711 }
 712
 713 /*
 714  * We don't actually need to cache the rpc and session headers, so we
 715  * can allocate a little less for each slot:
 716  */
 717 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
 718 {
 719         return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 720 }
 721
 722 static int nfsd4_sanitize_slot_size(u32 size)
 723 {
 724         size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
 725         size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
 726
 727         return size;
 728 }
 729
 730 /*
 731  * XXX: If we run out of reserved DRC memory we could (up to a point)
 732  * re-negotiate active sessions and reduce their slot usage to make
 733  * room for new connections. For now we just fail the create session.
 734  */
 735 static int nfsd4_get_drc_mem(int slotsize, u32 num)
 736 {
 737         int avail;
 738
 739         num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
 740
 741         spin_lock(&nfsd_drc_lock);
 742         avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
 743                         nfsd_drc_max_mem - nfsd_drc_mem_used);
 744         num = min_t(int, num, avail / slotsize);
 745         nfsd_drc_mem_used += num * slotsize;
 746         spin_unlock(&nfsd_drc_lock);
 747
 748         return num;
 749 }
 750
 751 static void nfsd4_put_drc_mem(int slotsize, int num)
 752 {
 753         spin_lock(&nfsd_drc_lock);
 754         nfsd_drc_mem_used -= slotsize * num;
 755         spin_unlock(&nfsd_drc_lock);
 756 }
 757
 758 static struct nfsd4_session *alloc_session(int slotsize, int numslots)
 759 {
 760         struct nfsd4_session *new;
 761         int mem, i;
 762
 763         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 764                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 765         mem = numslots * sizeof(struct nfsd4_slot *);
 766
 767         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 768         if (!new)
 769                 return NULL;
 770         /* allocate each struct nfsd4_slot and data cache in one piece */
 771         for (i = 0; i < numslots; i++) {
 772                 mem = sizeof(struct nfsd4_slot) + slotsize;
 773                 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
 774                 if (!new->se_slots[i])
 775                         goto out_free;
 776         }
 777         return new;
 778 out_free:
 779         while (i--)
 780                 kfree(new->se_slots[i]);
 781         kfree(new);
 782         return NULL;
 783 }
 784
 785 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
 786 {
 787         u32 maxrpc = nfsd_serv->sv_max_mesg;
 788
 789         new->maxreqs = numslots;
 790         new->maxresp_cached = min_t(u32, req->maxresp_cached,
 791                                         slotsize + NFSD_MIN_HDR_SEQ_SZ);
 792         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
 793         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
 794         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
 795 }
 796
 797 static void free_conn(struct nfsd4_conn *c)
 798 {
 799         svc_xprt_put(c->cn_xprt);
 800         kfree(c);
 801 }
 802
 803 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 804 {
 805         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 806         struct nfs4_client *clp = c->cn_session->se_client;
 807
 808         spin_lock(&clp->cl_lock);
 809         if (!list_empty(&c->cn_persession)) {
 810                 list_del(&c->cn_persession);
 811                 free_conn(c);
 812         }
 813         spin_unlock(&clp->cl_lock);
 814         nfsd4_probe_callback(clp);
 815 }
 816
 817 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 818 {
 819         struct nfsd4_conn *conn;
 820
 821         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 822         if (!conn)
 823                 return NULL;
 824         svc_xprt_get(rqstp->rq_xprt);
 825         conn->cn_xprt = rqstp->rq_xprt;
 826         conn->cn_flags = flags;
 827         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 828         return conn;
 829 }
 830
 831 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 832 {
 833         conn->cn_session = ses;
 834         list_add(&conn->cn_persession, &ses->se_conns);
 835 }
 836
 837 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 838 {
 839         struct nfs4_client *clp = ses->se_client;
 840
 841         spin_lock(&clp->cl_lock);
 842         __nfsd4_hash_conn(conn, ses);
 843         spin_unlock(&clp->cl_lock);
 844 }
 845
 846 static int nfsd4_register_conn(struct nfsd4_conn *conn)
 847 {
 848         conn->cn_xpt_user.callback = nfsd4_conn_lost;
 849         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 850 }
 851
 852 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses, u32 dir)
 853 {
 854         struct nfsd4_conn *conn;
 855         int ret;
 856
 857         conn = alloc_conn(rqstp, dir);
 858         if (!conn)
 859                 return nfserr_jukebox;
 860         nfsd4_hash_conn(conn, ses);
 861         ret = nfsd4_register_conn(conn);
 862         if (ret)
 863                 /* oops; xprt is already down: */
 864                 nfsd4_conn_lost(&conn->cn_xpt_user);
 865         return nfs_ok;
 866 }
 867
 868 static __be32 nfsd4_new_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_session *ses)
 869 {
 870         u32 dir = NFS4_CDFC4_FORE;
 871
 872         if (ses->se_flags & SESSION4_BACK_CHAN)
 873                 dir |= NFS4_CDFC4_BACK;
 874
 875         return nfsd4_new_conn(rqstp, ses, dir);
 876 }
 877
 878 /* must be called under client_lock */
 879 static void nfsd4_del_conns(struct nfsd4_session *s)
 880 {
 881         struct nfs4_client *clp = s->se_client;
 882         struct nfsd4_conn *c;
 883
 884         spin_lock(&clp->cl_lock);
 885         while (!list_empty(&s->se_conns)) {
 886                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 887                 list_del_init(&c->cn_persession);
 888                 spin_unlock(&clp->cl_lock);
 889
 890                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 891                 free_conn(c);
 892
 893                 spin_lock(&clp->cl_lock);
 894         }
 895         spin_unlock(&clp->cl_lock);
 896 }
 897
 898 static void free_session(struct kref *kref)
 899 {
 900         struct nfsd4_session *ses;
 901         int mem;
 902
 903         lockdep_assert_held(&client_lock);
 904         ses = container_of(kref, struct nfsd4_session, se_ref);
 905         nfsd4_del_conns(ses);
 906         spin_lock(&nfsd_drc_lock);
 907         mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
 908         nfsd_drc_mem_used -= mem;
 909         spin_unlock(&nfsd_drc_lock);
 910         free_session_slots(ses);
 911         kfree(ses);
 912 }
 913
 914 void nfsd4_put_session(struct nfsd4_session *ses)
 915 {
 916         spin_lock(&client_lock);
 917         nfsd4_put_session_locked(ses);
 918         spin_unlock(&client_lock);
 919 }
 920
 921 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 922 {
 923         struct nfsd4_session *new;
 924         struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
 925         int numslots, slotsize;
 926         __be32 status;
 927         int idx;
 928
 929         /*
 930          * Note decreasing slot size below client's request may
 931          * make it difficult for client to function correctly, whereas
 932          * decreasing the number of slots will (just?) affect
 933          * performance.  When short on memory we therefore prefer to
 934          * decrease number of slots instead of their size.
 935          */
 936         slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
 937         numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
 938         if (numslots < 1)
 939                 return NULL;
 940
 941         new = alloc_session(slotsize, numslots);
 942         if (!new) {
 943                 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
 944                 return NULL;
 945         }
 946         init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
 947
 948         new->se_client = clp;
 949         gen_sessionid(new);
 950
 951         INIT_LIST_HEAD(&new->se_conns);
 952
 953         new->se_cb_seq_nr = 1;
 954         new->se_flags = cses->flags;
 955         new->se_cb_prog = cses->callback_prog;
 956         kref_init(&new->se_ref);
 957         idx = hash_sessionid(&new->se_sessionid);
 958         spin_lock(&client_lock);
 959         list_add(&new->se_hash, &sessionid_hashtbl[idx]);
 960         spin_lock(&clp->cl_lock);
 961         list_add(&new->se_perclnt, &clp->cl_sessions);
 962         spin_unlock(&clp->cl_lock);
 963         spin_unlock(&client_lock);
 964
 965         status = nfsd4_new_conn_from_crses(rqstp, new);
 966         /* whoops: benny points out, status is ignored! (err, or bogus) */
 967         if (status) {
 968                 spin_lock(&client_lock);
 969                 free_session(&new->se_ref);
 970                 spin_unlock(&client_lock);
 971                 return NULL;
 972         }
 973         if (cses->flags & SESSION4_BACK_CHAN) {
 974                 struct sockaddr *sa = svc_addr(rqstp);
 975                 /*
 976                  * This is a little silly; with sessions there's no real
 977                  * use for the callback address.  Use the peer address
 978                  * as a reasonable default for now, but consider fixing
 979                  * the rpc client not to require an address in the
 980                  * future:
 981                  */
 982                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
 983                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
 984         }
 985         nfsd4_probe_callback(clp);
 986         return new;
 987 }
 988
 989 /* caller must hold client_lock */
 990 static struct nfsd4_session *
 991 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
 992 {
 993         struct nfsd4_session *elem;
 994         int idx;
 995
 996         dump_sessionid(__func__, sessionid);
 997         idx = hash_sessionid(sessionid);
 998         /* Search in the appropriate list */
 999         list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
1000                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1001                             NFS4_MAX_SESSIONID_LEN)) {
1002                         return elem;
1003                 }
1004         }
1005
1006         dprintk("%s: session not found\n", __func__);
1007         return NULL;
1008 }
1009
1010 /* caller must hold client_lock */
1011 static void
1012 unhash_session(struct nfsd4_session *ses)
1013 {
1014         list_del(&ses->se_hash);
1015         spin_lock(&ses->se_client->cl_lock);
1016         list_del(&ses->se_perclnt);
1017         spin_unlock(&ses->se_client->cl_lock);
1018 }
1019
1020 /* must be called under the client_lock */
1021 static inline void
1022 renew_client_locked(struct nfs4_client *clp)
1023 {
1024         if (is_client_expired(clp)) {
1025                 WARN_ON(1);
1026                 printk("%s: client (clientid %08x/%08x) already expired\n",
1027                         __func__,
1028                         clp->cl_clientid.cl_boot,
1029                         clp->cl_clientid.cl_id);
1030                 return;
1031         }
1032
1033         dprintk("renewing client (clientid %08x/%08x)\n",
1034                         clp->cl_clientid.cl_boot,
1035                         clp->cl_clientid.cl_id);
1036         list_move_tail(&clp->cl_lru, &client_lru);
1037         clp->cl_time = get_seconds();
1038 }
1039
1040 static inline void
1041 renew_client(struct nfs4_client *clp)
1042 {
1043         spin_lock(&client_lock);
1044         renew_client_locked(clp);
1045         spin_unlock(&client_lock);
1046 }
1047
1048 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1049 static int
1050 STALE_CLIENTID(clientid_t *clid)
1051 {
1052         if (clid->cl_boot == boot_time)
1053                 return 0;
1054         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1055                 clid->cl_boot, clid->cl_id, boot_time);
1056         return 1;
1057 }
1058
1059 /*
1060  * XXX Should we use a slab cache ?
1061  * This type of memory management is somewhat inefficient, but we use it
1062  * anyway since SETCLIENTID is not a common operation.
1063  */
1064 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1065 {
1066         struct nfs4_client *clp;
1067
1068         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1069         if (clp == NULL)
1070                 return NULL;
1071         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1072         if (clp->cl_name.data == NULL) {
1073                 kfree(clp);
1074                 return NULL;
1075         }
1076         clp->cl_name.len = name.len;
1077         return clp;
1078 }
1079
1080 static inline void
1081 free_client(struct nfs4_client *clp)
1082 {
1083         lockdep_assert_held(&client_lock);
1084         while (!list_empty(&clp->cl_sessions)) {
1085                 struct nfsd4_session *ses;
1086                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1087                                 se_perclnt);
1088                 list_del(&ses->se_perclnt);
1089                 nfsd4_put_session_locked(ses);
1090         }
1091         free_svc_cred(&clp->cl_cred);
1092         kfree(clp->cl_name.data);
1093         kfree(clp);
1094 }
1095
1096 void
1097 release_session_client(struct nfsd4_session *session)
1098 {
1099         struct nfs4_client *clp = session->se_client;
1100
1101         if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1102                 return;
1103         if (is_client_expired(clp)) {
1104                 free_client(clp);
1105                 session->se_client = NULL;
1106         } else
1107                 renew_client_locked(clp);
1108         spin_unlock(&client_lock);
1109 }
1110
1111 /* must be called under the client_lock */
1112 static inline void
1113 unhash_client_locked(struct nfs4_client *clp)
1114 {
1115         struct nfsd4_session *ses;
1116
1117         mark_client_expired(clp);
1118         list_del(&clp->cl_lru);
1119         spin_lock(&clp->cl_lock);
1120         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1121                 list_del_init(&ses->se_hash);
1122         spin_unlock(&clp->cl_lock);
1123 }
1124
1125 static void
1126 expire_client(struct nfs4_client *clp)
1127 {
1128         struct nfs4_openowner *oo;
1129         struct nfs4_delegation *dp;
1130         struct list_head reaplist;
1131
1132         INIT_LIST_HEAD(&reaplist);
1133         spin_lock(&recall_lock);
1134         while (!list_empty(&clp->cl_delegations)) {
1135                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1136                 list_del_init(&dp->dl_perclnt);
1137                 list_move(&dp->dl_recall_lru, &reaplist);
1138         }
1139         spin_unlock(&recall_lock);
1140         while (!list_empty(&reaplist)) {
1141                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1142                 unhash_delegation(dp);
1143         }
1144         while (!list_empty(&clp->cl_openowners)) {
1145                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1146                 release_openowner(oo);
1147         }
1148         nfsd4_shutdown_callback(clp);
1149         if (clp->cl_cb_conn.cb_xprt)
1150                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1151         list_del(&clp->cl_idhash);
1152         list_del(&clp->cl_strhash);
1153         spin_lock(&client_lock);
1154         unhash_client_locked(clp);
1155         if (atomic_read(&clp->cl_refcount) == 0)
1156                 free_client(clp);
1157         spin_unlock(&client_lock);
1158 }
1159
1160 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1161 {
1162         memcpy(target->cl_verifier.data, source->data,
1163                         sizeof(target->cl_verifier.data));
1164 }
1165
1166 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1167 {
1168         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1169         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1170 }
1171
1172 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1173 {
1174         if (source->cr_principal) {
1175                 target->cr_principal =
1176                                 kstrdup(source->cr_principal, GFP_KERNEL);
1177                 if (target->cr_principal == NULL)
1178                         return -ENOMEM;
1179         } else
1180                 target->cr_principal = NULL;
1181         target->cr_flavor = source->cr_flavor;
1182         target->cr_uid = source->cr_uid;
1183         target->cr_gid = source->cr_gid;
1184         target->cr_group_info = source->cr_group_info;
1185         get_group_info(target->cr_group_info);
1186         return 0;
1187 }
1188
1189 static int same_name(const char *n1, const char *n2)
1190 {
1191         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1192 }
1193
1194 static int
1195 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1196 {
1197         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1198 }
1199
1200 static int
1201 same_clid(clientid_t *cl1, clientid_t *cl2)
1202 {
1203         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1204 }
1205
1206 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1207 {
1208         int i;
1209
1210         if (g1->ngroups != g2->ngroups)
1211                 return false;
1212         for (i=0; i<g1->ngroups; i++)
1213                 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1214                         return false;
1215         return true;
1216 }
1217
1218 static int
1219 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1220 {
1221         if ((cr1->cr_flavor != cr2->cr_flavor)
1222                 || (cr1->cr_uid != cr2->cr_uid)
1223                 || (cr1->cr_gid != cr2->cr_gid)
1224                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1225                 return false;
1226         if (cr1->cr_principal == cr2->cr_principal)
1227                 return true;
1228         if (!cr1->cr_principal || !cr2->cr_principal)
1229                 return false;
1230         return 0 == strcmp(cr1->cr_principal, cr1->cr_principal);
1231 }
1232
1233 static void gen_clid(struct nfs4_client *clp)
1234 {
1235         static u32 current_clientid = 1;
1236
1237         clp->cl_clientid.cl_boot = boot_time;
1238         clp->cl_clientid.cl_id = current_clientid++;
1239 }
1240
1241 static void gen_confirm(struct nfs4_client *clp)
1242 {
1243         __be32 verf[2];
1244         static u32 i;
1245
1246         verf[0] = (__be32)get_seconds();
1247         verf[1] = (__be32)i++;
1248         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1249 }
1250
1251 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1252 {
1253         return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1254 }
1255
1256 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1257 {
1258         struct nfs4_stid *s;
1259
1260         s = find_stateid(cl, t);
1261         if (!s)
1262                 return NULL;
1263         if (typemask & s->sc_type)
1264                 return s;
1265         return NULL;
1266 }
1267
1268 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1269                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1270 {
1271         struct nfs4_client *clp;
1272         struct sockaddr *sa = svc_addr(rqstp);
1273         int ret;
1274
1275         clp = alloc_client(name);
1276         if (clp == NULL)
1277                 return NULL;
1278
1279         INIT_LIST_HEAD(&clp->cl_sessions);
1280         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1281         if (ret) {
1282                 spin_lock(&client_lock);
1283                 free_client(clp);
1284                 spin_unlock(&client_lock);
1285                 return NULL;
1286         }
1287         idr_init(&clp->cl_stateids);
1288         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1289         atomic_set(&clp->cl_refcount, 0);
1290         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1291         INIT_LIST_HEAD(&clp->cl_idhash);
1292         INIT_LIST_HEAD(&clp->cl_strhash);
1293         INIT_LIST_HEAD(&clp->cl_openowners);
1294         INIT_LIST_HEAD(&clp->cl_delegations);
1295         INIT_LIST_HEAD(&clp->cl_lru);
1296         INIT_LIST_HEAD(&clp->cl_callbacks);
1297         spin_lock_init(&clp->cl_lock);
1298         INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1299         clp->cl_time = get_seconds();
1300         clear_bit(0, &clp->cl_cb_slot_busy);
1301         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1302         copy_verf(clp, verf);
1303         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1304         gen_confirm(clp);
1305         clp->cl_cb_session = NULL;
1306         return clp;
1307 }
1308
1309 static void
1310 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1311 {
1312         unsigned int idhashval;
1313
1314         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1315         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1316         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1317         renew_client(clp);
1318 }
1319
1320 static void
1321 move_to_confirmed(struct nfs4_client *clp)
1322 {
1323         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1324         unsigned int strhashval;
1325
1326         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1327         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1328         strhashval = clientstr_hashval(clp->cl_recdir);
1329         list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1330         renew_client(clp);
1331 }
1332
1333 static struct nfs4_client *
1334 find_confirmed_client(clientid_t *clid)
1335 {
1336         struct nfs4_client *clp;
1337         unsigned int idhashval = clientid_hashval(clid->cl_id);
1338
1339         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1340                 if (same_clid(&clp->cl_clientid, clid)) {
1341                         renew_client(clp);
1342                         return clp;
1343                 }
1344         }
1345         return NULL;
1346 }
1347
1348 static struct nfs4_client *
1349 find_unconfirmed_client(clientid_t *clid)
1350 {
1351         struct nfs4_client *clp;
1352         unsigned int idhashval = clientid_hashval(clid->cl_id);
1353
1354         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1355                 if (same_clid(&clp->cl_clientid, clid))
1356                         return clp;
1357         }
1358         return NULL;
1359 }
1360
1361 static bool clp_used_exchangeid(struct nfs4_client *clp)
1362 {
1363         return clp->cl_exchange_flags != 0;
1364 }
1365
1366 static struct nfs4_client *
1367 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1368 {
1369         struct nfs4_client *clp;
1370
1371         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1372                 if (same_name(clp->cl_recdir, dname))
1373                         return clp;
1374         }
1375         return NULL;
1376 }
1377
1378 static struct nfs4_client *
1379 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1380 {
1381         struct nfs4_client *clp;
1382
1383         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1384                 if (same_name(clp->cl_recdir, dname))
1385                         return clp;
1386         }
1387         return NULL;
1388 }
1389
1390 static void
1391 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1392 {
1393         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1394         struct sockaddr *sa = svc_addr(rqstp);
1395         u32 scopeid = rpc_get_scope_id(sa);
1396         unsigned short expected_family;
1397
1398         /* Currently, we only support tcp and tcp6 for the callback channel */
1399         if (se->se_callback_netid_len == 3 &&
1400             !memcmp(se->se_callback_netid_val, "tcp", 3))
1401                 expected_family = AF_INET;
1402         else if (se->se_callback_netid_len == 4 &&
1403                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1404                 expected_family = AF_INET6;
1405         else
1406                 goto out_err;
1407
1408         conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val,
1409                                             se->se_callback_addr_len,
1410                                             (struct sockaddr *)&conn->cb_addr,
1411                                             sizeof(conn->cb_addr));
1412
1413         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1414                 goto out_err;
1415
1416         if (conn->cb_addr.ss_family == AF_INET6)
1417                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1418
1419         conn->cb_prog = se->se_callback_prog;
1420         conn->cb_ident = se->se_callback_ident;
1421         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1422         return;
1423 out_err:
1424         conn->cb_addr.ss_family = AF_UNSPEC;
1425         conn->cb_addrlen = 0;
1426         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1427                 "will not receive delegations\n",
1428                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1429
1430         return;
1431 }
1432
1433 /*
1434  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1435  */
1436 void
1437 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1438 {
1439         struct nfsd4_slot *slot = resp->cstate.slot;
1440         unsigned int base;
1441
1442         dprintk("--> %s slot %p\n", __func__, slot);
1443
1444         slot->sl_opcnt = resp->opcnt;
1445         slot->sl_status = resp->cstate.status;
1446
1447         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1448         if (nfsd4_not_cached(resp)) {
1449                 slot->sl_datalen = 0;
1450                 return;
1451         }
1452         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1453         base = (char *)resp->cstate.datap -
1454                                         (char *)resp->xbuf->head[0].iov_base;
1455         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1456                                     slot->sl_datalen))
1457                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1458         return;
1459 }
1460
1461 /*
1462  * Encode the replay sequence operation from the slot values.
1463  * If cachethis is FALSE encode the uncached rep error on the next
1464  * operation which sets resp->p and increments resp->opcnt for
1465  * nfs4svc_encode_compoundres.
1466  *
1467  */
1468 static __be32
1469 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1470                           struct nfsd4_compoundres *resp)
1471 {
1472         struct nfsd4_op *op;
1473         struct nfsd4_slot *slot = resp->cstate.slot;
1474
1475         /* Encode the replayed sequence operation */
1476         op = &args->ops[resp->opcnt - 1];
1477         nfsd4_encode_operation(resp, op);
1478
1479         /* Return nfserr_retry_uncached_rep in next operation. */
1480         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1481                 op = &args->ops[resp->opcnt++];
1482                 op->status = nfserr_retry_uncached_rep;
1483                 nfsd4_encode_operation(resp, op);
1484         }
1485         return op->status;
1486 }
1487
1488 /*
1489  * The sequence operation is not cached because we can use the slot and
1490  * session values.
1491  */
1492 __be32
1493 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1494                          struct nfsd4_sequence *seq)
1495 {
1496         struct nfsd4_slot *slot = resp->cstate.slot;
1497         __be32 status;
1498
1499         dprintk("--> %s slot %p\n", __func__, slot);
1500
1501         /* Either returns 0 or nfserr_retry_uncached */
1502         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1503         if (status == nfserr_retry_uncached_rep)
1504                 return status;
1505
1506         /* The sequence operation has been encoded, cstate->datap set. */
1507         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1508
1509         resp->opcnt = slot->sl_opcnt;
1510         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1511         status = slot->sl_status;
1512
1513         return status;
1514 }
1515
1516 /*
1517  * Set the exchange_id flags returned by the server.
1518  */
1519 static void
1520 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1521 {
1522         /* pNFS is not supported */
1523         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1524
1525         /* Referrals are supported, Migration is not. */
1526         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1527
1528         /* set the wire flags to return to client. */
1529         clid->flags = new->cl_exchange_flags;
1530 }
1531
1532 static bool client_has_state(struct nfs4_client *clp)
1533 {
1534         /*
1535          * Note clp->cl_openowners check isn't quite right: there's no
1536          * need to count owners without stateid's.
1537          *
1538          * Also note we should probably be using this in 4.0 case too.
1539          */
1540         return !list_empty(&clp->cl_openowners)
1541                 || !list_empty(&clp->cl_delegations)
1542                 || !list_empty(&clp->cl_sessions);
1543 }
1544
1545 __be32
1546 nfsd4_exchange_id(struct svc_rqst *rqstp,
1547                   struct nfsd4_compound_state *cstate,
1548                   struct nfsd4_exchange_id *exid)
1549 {
1550         struct nfs4_client *unconf, *conf, *new;
1551         __be32 status;
1552         unsigned int            strhashval;
1553         char                    dname[HEXDIR_LEN];
1554         char                    addr_str[INET6_ADDRSTRLEN];
1555         nfs4_verifier           verf = exid->verifier;
1556         struct sockaddr         *sa = svc_addr(rqstp);
1557         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1558
1559         rpc_ntop(sa, addr_str, sizeof(addr_str));
1560         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1561                 "ip_addr=%s flags %x, spa_how %d\n",
1562                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1563                 addr_str, exid->flags, exid->spa_how);
1564
1565         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1566                 return nfserr_inval;
1567
1568         /* Currently only support SP4_NONE */
1569         switch (exid->spa_how) {
1570         case SP4_NONE:
1571                 break;
1572         case SP4_SSV:
1573                 return nfserr_serverfault;
1574         default:
1575                 BUG();                          /* checked by xdr code */
1576         case SP4_MACH_CRED:
1577                 return nfserr_serverfault;      /* no excuse :-/ */
1578         }
1579
1580         status = nfs4_make_rec_clidname(dname, &exid->clname);
1581
1582         if (status)
1583                 return status;
1584
1585         strhashval = clientstr_hashval(dname);
1586
1587         /* Cases below refer to rfc 5661 section 18.35.4: */
1588         nfs4_lock_state();
1589         conf = find_confirmed_client_by_str(dname, strhashval);
1590         if (conf) {
1591                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1592                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1593
1594                 if (update) {
1595                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1596                                 status = nfserr_inval;
1597                                 goto out;
1598                         }
1599                         if (!creds_match) { /* case 9 */
1600                                 status = nfserr_perm;
1601                                 goto out;
1602                         }
1603                         if (!verfs_match) { /* case 8 */
1604                                 status = nfserr_not_same;
1605                                 goto out;
1606                         }
1607                         /* case 6 */
1608                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1609                         new = conf;
1610                         goto out_copy;
1611                 }
1612                 if (!creds_match) { /* case 3 */
1613                         if (client_has_state(conf)) {
1614                                 status = nfserr_clid_inuse;
1615                                 goto out;
1616                         }
1617                         expire_client(conf);
1618                         goto out_new;
1619                 }
1620                 if (verfs_match) { /* case 2 */
1621                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1622                         new = conf;
1623                         goto out_copy;
1624                 }
1625                 /* case 5, client reboot */
1626                 goto out_new;
1627         }
1628
1629         if (update) { /* case 7 */
1630                 status = nfserr_noent;
1631                 goto out;
1632         }
1633
1634         unconf  = find_unconfirmed_client_by_str(dname, strhashval);
1635         if (unconf) /* case 4, possible retry or client restart */
1636                 expire_client(unconf);
1637
1638         /* case 1 (normal case) */
1639 out_new:
1640         new = create_client(exid->clname, dname, rqstp, &verf);
1641         if (new == NULL) {
1642                 status = nfserr_jukebox;
1643                 goto out;
1644         }
1645
1646         gen_clid(new);
1647         add_to_unconfirmed(new, strhashval);
1648 out_copy:
1649         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1650         exid->clientid.cl_id = new->cl_clientid.cl_id;
1651
1652         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1653         nfsd4_set_ex_flags(new, exid);
1654
1655         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1656                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1657         status = nfs_ok;
1658
1659 out:
1660         nfs4_unlock_state();
1661         return status;
1662 }
1663
1664 static __be32
1665 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1666 {
1667         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1668                 slot_seqid);
1669
1670         /* The slot is in use, and no response has been sent. */
1671         if (slot_inuse) {
1672                 if (seqid == slot_seqid)
1673                         return nfserr_jukebox;
1674                 else
1675                         return nfserr_seq_misordered;
1676         }
1677         /* Note unsigned 32-bit arithmetic handles wraparound: */
1678         if (likely(seqid == slot_seqid + 1))
1679                 return nfs_ok;
1680         if (seqid == slot_seqid)
1681                 return nfserr_replay_cache;
1682         return nfserr_seq_misordered;
1683 }
1684
1685 /*
1686  * Cache the create session result into the create session single DRC
1687  * slot cache by saving the xdr structure. sl_seqid has been set.
1688  * Do this for solo or embedded create session operations.
1689  */
1690 static void
1691 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1692                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1693 {
1694         slot->sl_status = nfserr;
1695         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1696 }
1697
1698 static __be32
1699 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1700                             struct nfsd4_clid_slot *slot)
1701 {
1702         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1703         return slot->sl_status;
1704 }
1705
1706 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1707                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1708                         1 +     /* MIN tag is length with zero, only length */ \
1709                         3 +     /* version, opcount, opcode */ \
1710                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1711                                 /* seqid, slotID, slotID, cache */ \
1712                         4 ) * sizeof(__be32))
1713
1714 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1715                         2 +     /* verifier: AUTH_NULL, length 0 */\
1716                         1 +     /* status */ \
1717                         1 +     /* MIN tag is length with zero, only length */ \
1718                         3 +     /* opcount, opcode, opstatus*/ \
1719                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1720                                 /* seqid, slotID, slotID, slotID, status */ \
1721                         5 ) * sizeof(__be32))
1722
1723 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1724 {
1725         return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1726                 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1727 }
1728
1729 __be32
1730 nfsd4_create_session(struct svc_rqst *rqstp,
1731                      struct nfsd4_compound_state *cstate,
1732                      struct nfsd4_create_session *cr_ses)
1733 {
1734         struct sockaddr *sa = svc_addr(rqstp);
1735         struct nfs4_client *conf, *unconf;
1736         struct nfsd4_session *new;
1737         struct nfsd4_clid_slot *cs_slot = NULL;
1738         bool confirm_me = false;
1739         __be32 status = 0;
1740
1741         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1742                 return nfserr_inval;
1743
1744         nfs4_lock_state();
1745         unconf = find_unconfirmed_client(&cr_ses->clientid);
1746         conf = find_confirmed_client(&cr_ses->clientid);
1747
1748         if (conf) {
1749                 cs_slot = &conf->cl_cs_slot;
1750                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1751                 if (status == nfserr_replay_cache) {
1752                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1753                         goto out;
1754                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1755                         status = nfserr_seq_misordered;
1756                         goto out;
1757                 }
1758         } else if (unconf) {
1759                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1760                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1761                         status = nfserr_clid_inuse;
1762                         goto out;
1763                 }
1764                 cs_slot = &unconf->cl_cs_slot;
1765                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1766                 if (status) {
1767                         /* an unconfirmed replay returns misordered */
1768                         status = nfserr_seq_misordered;
1769                         goto out;
1770                 }
1771                 confirm_me = true;
1772                 conf = unconf;
1773         } else {
1774                 status = nfserr_stale_clientid;
1775                 goto out;
1776         }
1777
1778         /*
1779          * XXX: we should probably set this at creation time, and check
1780          * for consistent minorversion use throughout:
1781          */
1782         conf->cl_minorversion = 1;
1783         /*
1784          * We do not support RDMA or persistent sessions
1785          */
1786         cr_ses->flags &= ~SESSION4_PERSIST;
1787         cr_ses->flags &= ~SESSION4_RDMA;
1788
1789         status = nfserr_toosmall;
1790         if (check_forechannel_attrs(cr_ses->fore_channel))
1791                 goto out;
1792
1793         status = nfserr_jukebox;
1794         new = alloc_init_session(rqstp, conf, cr_ses);
1795         if (!new)
1796                 goto out;
1797         status = nfs_ok;
1798         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1799                NFS4_MAX_SESSIONID_LEN);
1800         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1801                 sizeof(struct nfsd4_channel_attrs));
1802         cs_slot->sl_seqid++;
1803         cr_ses->seqid = cs_slot->sl_seqid;
1804
1805         /* cache solo and embedded create sessions under the state lock */
1806         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1807         if (confirm_me) {
1808                 unsigned int hash = clientstr_hashval(unconf->cl_recdir);
1809                 struct nfs4_client *old =
1810                         find_confirmed_client_by_str(conf->cl_recdir, hash);
1811                 if (old)
1812                         expire_client(old);
1813                 move_to_confirmed(conf);
1814         }
1815 out:
1816         nfs4_unlock_state();
1817         dprintk("%s returns %d\n", __func__, ntohl(status));
1818         return status;
1819 }
1820
1821 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1822 {
1823         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1824         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1825
1826         return argp->opcnt == resp->opcnt;
1827 }
1828
1829 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1830 {
1831         switch (*dir) {
1832         case NFS4_CDFC4_FORE:
1833         case NFS4_CDFC4_BACK:
1834                 return nfs_ok;
1835         case NFS4_CDFC4_FORE_OR_BOTH:
1836         case NFS4_CDFC4_BACK_OR_BOTH:
1837                 *dir = NFS4_CDFC4_BOTH;
1838                 return nfs_ok;
1839         };
1840         return nfserr_inval;
1841 }
1842
1843 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1844                      struct nfsd4_compound_state *cstate,
1845                      struct nfsd4_bind_conn_to_session *bcts)
1846 {
1847         __be32 status;
1848
1849         if (!nfsd4_last_compound_op(rqstp))
1850                 return nfserr_not_only_op;
1851         spin_lock(&client_lock);
1852         cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1853         /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1854          * client_lock iself: */
1855         if (cstate->session) {
1856                 nfsd4_get_session(cstate->session);
1857                 atomic_inc(&cstate->session->se_client->cl_refcount);
1858         }
1859         spin_unlock(&client_lock);
1860         if (!cstate->session)
1861                 return nfserr_badsession;
1862
1863         status = nfsd4_map_bcts_dir(&bcts->dir);
1864         if (!status)
1865                 nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
1866         return status;
1867 }
1868
1869 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1870 {
1871         if (!session)
1872                 return 0;
1873         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1874 }
1875
1876 __be32
1877 nfsd4_destroy_session(struct svc_rqst *r,
1878                       struct nfsd4_compound_state *cstate,
1879                       struct nfsd4_destroy_session *sessionid)
1880 {
1881         struct nfsd4_session *ses;
1882         __be32 status = nfserr_badsession;
1883
1884         /* Notes:
1885          * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1886          * - Should we return nfserr_back_chan_busy if waiting for
1887          *   callbacks on to-be-destroyed session?
1888          * - Do we need to clear any callback info from previous session?
1889          */
1890
1891         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1892                 if (!nfsd4_last_compound_op(r))
1893                         return nfserr_not_only_op;
1894         }
1895         dump_sessionid(__func__, &sessionid->sessionid);
1896         spin_lock(&client_lock);
1897         ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1898         if (!ses) {
1899                 spin_unlock(&client_lock);
1900                 goto out;
1901         }
1902
1903         unhash_session(ses);
1904         spin_unlock(&client_lock);
1905
1906         nfs4_lock_state();
1907         nfsd4_probe_callback_sync(ses->se_client);
1908         nfs4_unlock_state();
1909
1910         spin_lock(&client_lock);
1911         nfsd4_del_conns(ses);
1912         nfsd4_put_session_locked(ses);
1913         spin_unlock(&client_lock);
1914         status = nfs_ok;
1915 out:
1916         dprintk("%s returns %d\n", __func__, ntohl(status));
1917         return status;
1918 }
1919
1920 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1921 {
1922         struct nfsd4_conn *c;
1923
1924         list_for_each_entry(c, &s->se_conns, cn_persession) {
1925                 if (c->cn_xprt == xpt) {
1926                         return c;
1927                 }
1928         }
1929         return NULL;
1930 }
1931
1932 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1933 {
1934         struct nfs4_client *clp = ses->se_client;
1935         struct nfsd4_conn *c;
1936         int ret;
1937
1938         spin_lock(&clp->cl_lock);
1939         c = __nfsd4_find_conn(new->cn_xprt, ses);
1940         if (c) {
1941                 spin_unlock(&clp->cl_lock);
1942                 free_conn(new);
1943                 return;
1944         }
1945         __nfsd4_hash_conn(new, ses);
1946         spin_unlock(&clp->cl_lock);
1947         ret = nfsd4_register_conn(new);
1948         if (ret)
1949                 /* oops; xprt is already down: */
1950                 nfsd4_conn_lost(&new->cn_xpt_user);
1951         return;
1952 }
1953
1954 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
1955 {
1956         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1957
1958         return args->opcnt > session->se_fchannel.maxops;
1959 }
1960
1961 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
1962                                   struct nfsd4_session *session)
1963 {
1964         struct xdr_buf *xb = &rqstp->rq_arg;
1965
1966         return xb->len > session->se_fchannel.maxreq_sz;
1967 }
1968
1969 __be32
1970 nfsd4_sequence(struct svc_rqst *rqstp,
1971                struct nfsd4_compound_state *cstate,
1972                struct nfsd4_sequence *seq)
1973 {
1974         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1975         struct nfsd4_session *session;
1976         struct nfsd4_slot *slot;
1977         struct nfsd4_conn *conn;
1978         __be32 status;
1979
1980         if (resp->opcnt != 1)
1981                 return nfserr_sequence_pos;
1982
1983         /*
1984          * Will be either used or freed by nfsd4_sequence_check_conn
1985          * below.
1986          */
1987         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1988         if (!conn)
1989                 return nfserr_jukebox;
1990
1991         spin_lock(&client_lock);
1992         status = nfserr_badsession;
1993         session = find_in_sessionid_hashtbl(&seq->sessionid);
1994         if (!session)
1995                 goto out;
1996
1997         status = nfserr_too_many_ops;
1998         if (nfsd4_session_too_many_ops(rqstp, session))
1999                 goto out;
2000
2001         status = nfserr_req_too_big;
2002         if (nfsd4_request_too_big(rqstp, session))
2003                 goto out;
2004
2005         status = nfserr_badslot;
2006         if (seq->slotid >= session->se_fchannel.maxreqs)
2007                 goto out;
2008
2009         slot = session->se_slots[seq->slotid];
2010         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2011
2012         /* We do not negotiate the number of slots yet, so set the
2013          * maxslots to the session maxreqs which is used to encode
2014          * sr_highest_slotid and the sr_target_slot id to maxslots */
2015         seq->maxslots = session->se_fchannel.maxreqs;
2016
2017         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2018                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2019         if (status == nfserr_replay_cache) {
2020                 status = nfserr_seq_misordered;
2021                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2022                         goto out;
2023                 cstate->slot = slot;
2024                 cstate->session = session;
2025                 /* Return the cached reply status and set cstate->status
2026                  * for nfsd4_proc_compound processing */
2027                 status = nfsd4_replay_cache_entry(resp, seq);
2028                 cstate->status = nfserr_replay_cache;
2029                 goto out;
2030         }
2031         if (status)
2032                 goto out;
2033
2034         nfsd4_sequence_check_conn(conn, session);
2035         conn = NULL;
2036
2037         /* Success! bump slot seqid */
2038         slot->sl_seqid = seq->seqid;
2039         slot->sl_flags |= NFSD4_SLOT_INUSE;
2040         if (seq->cachethis)
2041                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2042         else
2043                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2044
2045         cstate->slot = slot;
2046         cstate->session = session;
2047
2048 out:
2049         /* Hold a session reference until done processing the compound. */
2050         if (cstate->session) {
2051                 struct nfs4_client *clp = session->se_client;
2052
2053                 nfsd4_get_session(cstate->session);
2054                 atomic_inc(&clp->cl_refcount);
2055                 switch (clp->cl_cb_state) {
2056                 case NFSD4_CB_DOWN:
2057                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2058                         break;
2059                 case NFSD4_CB_FAULT:
2060                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2061                         break;
2062                 default:
2063                         seq->status_flags = 0;
2064                 }
2065         }
2066         kfree(conn);
2067         spin_unlock(&client_lock);
2068         dprintk("%s: return %d\n", __func__, ntohl(status));
2069         return status;
2070 }
2071
2072 __be32
2073 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2074 {
2075         struct nfs4_client *conf, *unconf, *clp;
2076         __be32 status = 0;
2077
2078         nfs4_lock_state();
2079         unconf = find_unconfirmed_client(&dc->clientid);
2080         conf = find_confirmed_client(&dc->clientid);
2081
2082         if (conf) {
2083                 clp = conf;
2084
2085                 if (!is_client_expired(conf) && client_has_state(conf)) {
2086                         status = nfserr_clientid_busy;
2087                         goto out;
2088                 }
2089
2090                 /* rfc5661 18.50.3 */
2091                 if (cstate->session && conf == cstate->session->se_client) {
2092                         status = nfserr_clientid_busy;
2093                         goto out;
2094                 }
2095         } else if (unconf)
2096                 clp = unconf;
2097         else {
2098                 status = nfserr_stale_clientid;
2099                 goto out;
2100         }
2101
2102         expire_client(clp);
2103 out:
2104         nfs4_unlock_state();
2105         dprintk("%s return %d\n", __func__, ntohl(status));
2106         return status;
2107 }
2108
2109 __be32
2110 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2111 {
2112         __be32 status = 0;
2113
2114         if (rc->rca_one_fs) {
2115                 if (!cstate->current_fh.fh_dentry)
2116                         return nfserr_nofilehandle;
2117                 /*
2118                  * We don't take advantage of the rca_one_fs case.
2119                  * That's OK, it's optional, we can safely ignore it.
2120                  */
2121                  return nfs_ok;
2122         }
2123
2124         nfs4_lock_state();
2125         status = nfserr_complete_already;
2126         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2127                              &cstate->session->se_client->cl_flags))
2128                 goto out;
2129
2130         status = nfserr_stale_clientid;
2131         if (is_client_expired(cstate->session->se_client))
2132                 /*
2133                  * The following error isn't really legal.
2134                  * But we only get here if the client just explicitly
2135                  * destroyed the client.  Surely it no longer cares what
2136                  * error it gets back on an operation for the dead
2137                  * client.
2138                  */
2139                 goto out;
2140
2141         status = nfs_ok;
2142         nfsd4_client_record_create(cstate->session->se_client);
2143 out:
2144         nfs4_unlock_state();
2145         return status;
2146 }
2147
2148 __be32
2149 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2150                   struct nfsd4_setclientid *setclid)
2151 {
2152         struct xdr_netobj       clname = setclid->se_name;
2153         nfs4_verifier           clverifier = setclid->se_verf;
2154         unsigned int            strhashval;
2155         struct nfs4_client      *conf, *unconf, *new;
2156         __be32                  status;
2157         char                    dname[HEXDIR_LEN];
2158
2159         status = nfs4_make_rec_clidname(dname, &clname);
2160         if (status)
2161                 return status;
2162
2163         strhashval = clientstr_hashval(dname);
2164
2165         /* Cases below refer to rfc 3530 section 14.2.33: */
2166         nfs4_lock_state();
2167         conf = find_confirmed_client_by_str(dname, strhashval);
2168         if (conf) {
2169                 /* case 0: */
2170                 status = nfserr_clid_inuse;
2171                 if (clp_used_exchangeid(conf))
2172                         goto out;
2173                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2174                         char addr_str[INET6_ADDRSTRLEN];
2175                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2176                                  sizeof(addr_str));
2177                         dprintk("NFSD: setclientid: string in use by client "
2178                                 "at %s\n", addr_str);
2179                         goto out;
2180                 }
2181         }
2182         unconf = find_unconfirmed_client_by_str(dname, strhashval);
2183         if (unconf)
2184                 expire_client(unconf);
2185         status = nfserr_jukebox;
2186         new = create_client(clname, dname, rqstp, &clverifier);
2187         if (new == NULL)
2188                 goto out;
2189         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2190                 /* case 1: probable callback update */
2191                 copy_clid(new, conf);
2192         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2193                 gen_clid(new);
2194         /*
2195          * XXX: we should probably set this at creation time, and check
2196          * for consistent minorversion use throughout:
2197          */
2198         new->cl_minorversion = 0;
2199         gen_callback(new, setclid, rqstp);
2200         add_to_unconfirmed(new, strhashval);
2201         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2202         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2203         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2204         status = nfs_ok;
2205 out:
2206         nfs4_unlock_state();
2207         return status;
2208 }
2209
2210
2211 __be32
2212 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2213                          struct nfsd4_compound_state *cstate,
2214                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2215 {
2216         struct nfs4_client *conf, *unconf;
2217         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2218         clientid_t * clid = &setclientid_confirm->sc_clientid;
2219         __be32 status;
2220
2221         if (STALE_CLIENTID(clid))
2222                 return nfserr_stale_clientid;
2223         nfs4_lock_state();
2224
2225         conf = find_confirmed_client(clid);
2226         unconf = find_unconfirmed_client(clid);
2227         /*
2228          * We try hard to give out unique clientid's, so if we get an
2229          * attempt to confirm the same clientid with a different cred,
2230          * there's a bug somewhere.  Let's charitably assume it's our
2231          * bug.
2232          */
2233         status = nfserr_serverfault;
2234         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2235                 goto out;
2236         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2237                 goto out;
2238         /* cases below refer to rfc 3530 section 14.2.34: */
2239         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2240                 if (conf && !unconf) /* case 2: probable retransmit */
2241                         status = nfs_ok;
2242                 else /* case 4: client hasn't noticed we rebooted yet? */
2243                         status = nfserr_stale_clientid;
2244                 goto out;
2245         }
2246         status = nfs_ok;
2247         if (conf) { /* case 1: callback update */
2248                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2249                 nfsd4_probe_callback(conf);
2250                 expire_client(unconf);
2251         } else { /* case 3: normal case; new or rebooted client */
2252                 unsigned int hash = clientstr_hashval(unconf->cl_recdir);
2253
2254                 conf = find_confirmed_client_by_str(unconf->cl_recdir, hash);
2255                 if (conf) {
2256                         nfsd4_client_record_remove(conf);
2257                         expire_client(conf);
2258                 }
2259                 move_to_confirmed(unconf);
2260                 nfsd4_probe_callback(unconf);
2261         }
2262 out:
2263         nfs4_unlock_state();
2264         return status;
2265 }
2266
2267 static struct nfs4_file *nfsd4_alloc_file(void)
2268 {
2269         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2270 }
2271
2272 /* OPEN Share state helper functions */
2273 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2274 {
2275         unsigned int hashval = file_hashval(ino);
2276
2277         atomic_set(&fp->fi_ref, 1);
2278         INIT_LIST_HEAD(&fp->fi_hash);
2279         INIT_LIST_HEAD(&fp->fi_stateids);
2280         INIT_LIST_HEAD(&fp->fi_delegations);
2281         fp->fi_inode = igrab(ino);
2282         fp->fi_had_conflict = false;
2283         fp->fi_lease = NULL;
2284         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2285         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2286         spin_lock(&recall_lock);
2287         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2288         spin_unlock(&recall_lock);
2289 }
2290
2291 static void
2292 nfsd4_free_slab(struct kmem_cache **slab)
2293 {
2294         if (*slab == NULL)
2295                 return;
2296         kmem_cache_destroy(*slab);
2297         *slab = NULL;
2298 }
2299
2300 void
2301 nfsd4_free_slabs(void)
2302 {
2303         nfsd4_free_slab(&openowner_slab);
2304         nfsd4_free_slab(&lockowner_slab);
2305         nfsd4_free_slab(&file_slab);
2306         nfsd4_free_slab(&stateid_slab);
2307         nfsd4_free_slab(&deleg_slab);
2308 }
2309
2310 int
2311 nfsd4_init_slabs(void)
2312 {
2313         openowner_slab = kmem_cache_create("nfsd4_openowners",
2314                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2315         if (openowner_slab == NULL)
2316                 goto out_nomem;
2317         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2318                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2319         if (lockowner_slab == NULL)
2320                 goto out_nomem;
2321         file_slab = kmem_cache_create("nfsd4_files",
2322                         sizeof(struct nfs4_file), 0, 0, NULL);
2323         if (file_slab == NULL)
2324                 goto out_nomem;
2325         stateid_slab = kmem_cache_create("nfsd4_stateids",
2326                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2327         if (stateid_slab == NULL)
2328                 goto out_nomem;
2329         deleg_slab = kmem_cache_create("nfsd4_delegations",
2330                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2331         if (deleg_slab == NULL)
2332                 goto out_nomem;
2333         return 0;
2334 out_nomem:
2335         nfsd4_free_slabs();
2336         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2337         return -ENOMEM;
2338 }
2339
2340 void nfs4_free_openowner(struct nfs4_openowner *oo)
2341 {
2342         kfree(oo->oo_owner.so_owner.data);
2343         kmem_cache_free(openowner_slab, oo);
2344 }
2345
2346 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2347 {
2348         kfree(lo->lo_owner.so_owner.data);
2349         kmem_cache_free(lockowner_slab, lo);
2350 }
2351
2352 static void init_nfs4_replay(struct nfs4_replay *rp)
2353 {
2354         rp->rp_status = nfserr_serverfault;
2355         rp->rp_buflen = 0;
2356         rp->rp_buf = rp->rp_ibuf;
2357 }
2358
2359 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2360 {
2361         struct nfs4_stateowner *sop;
2362
2363         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2364         if (!sop)
2365                 return NULL;
2366
2367         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2368         if (!sop->so_owner.data) {
2369                 kmem_cache_free(slab, sop);
2370                 return NULL;
2371         }
2372         sop->so_owner.len = owner->len;
2373
2374         INIT_LIST_HEAD(&sop->so_stateids);
2375         sop->so_client = clp;
2376         init_nfs4_replay(&sop->so_replay);
2377         return sop;
2378 }
2379
2380 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2381 {
2382         list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
2383         list_add(&oo->oo_perclient, &clp->cl_openowners);
2384 }
2385
2386 static struct nfs4_openowner *
2387 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2388         struct nfs4_openowner *oo;
2389
2390         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2391         if (!oo)
2392                 return NULL;
2393         oo->oo_owner.so_is_open_owner = 1;
2394         oo->oo_owner.so_seqid = open->op_seqid;
2395         oo->oo_flags = NFS4_OO_NEW;
2396         oo->oo_time = 0;
2397         oo->oo_last_closed_stid = NULL;
2398         INIT_LIST_HEAD(&oo->oo_close_lru);
2399         hash_openowner(oo, clp, strhashval);
2400         return oo;
2401 }
2402
2403 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2404         struct nfs4_openowner *oo = open->op_openowner;
2405         struct nfs4_client *clp = oo->oo_owner.so_client;
2406
2407         init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2408         INIT_LIST_HEAD(&stp->st_lockowners);
2409         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2410         list_add(&stp->st_perfile, &fp->fi_stateids);
2411         stp->st_stateowner = &oo->oo_owner;
2412         get_nfs4_file(fp);
2413         stp->st_file = fp;
2414         stp->st_access_bmap = 0;
2415         stp->st_deny_bmap = 0;
2416         set_access(open->op_share_access, stp);
2417         set_deny(open->op_share_deny, stp);
2418         stp->st_openstp = NULL;
2419 }
2420
2421 static void
2422 move_to_close_lru(struct nfs4_openowner *oo)
2423 {
2424         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2425
2426         list_move_tail(&oo->oo_close_lru, &close_lru);
2427         oo->oo_time = get_seconds();
2428 }
2429
2430 static int
2431 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2432                                                         clientid_t *clid)
2433 {
2434         return (sop->so_owner.len == owner->len) &&
2435                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2436                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2437 }
2438
2439 static struct nfs4_openowner *
2440 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2441 {
2442         struct nfs4_stateowner *so;
2443         struct nfs4_openowner *oo;
2444
2445         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2446                 if (!so->so_is_open_owner)
2447                         continue;
2448                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2449                         oo = openowner(so);
2450                         renew_client(oo->oo_owner.so_client);
2451                         return oo;
2452                 }
2453         }
2454         return NULL;
2455 }
2456
2457 /* search file_hashtbl[] for file */
2458 static struct nfs4_file *
2459 find_file(struct inode *ino)
2460 {
2461         unsigned int hashval = file_hashval(ino);
2462         struct nfs4_file *fp;
2463
2464         spin_lock(&recall_lock);
2465         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2466                 if (fp->fi_inode == ino) {
2467                         get_nfs4_file(fp);
2468                         spin_unlock(&recall_lock);
2469                         return fp;
2470                 }
2471         }
2472         spin_unlock(&recall_lock);
2473         return NULL;
2474 }
2475
2476 /*
2477  * Called to check deny when READ with all zero stateid or
2478  * WRITE with all zero or all one stateid
2479  */
2480 static __be32
2481 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2482 {
2483         struct inode *ino = current_fh->fh_dentry->d_inode;
2484         struct nfs4_file *fp;
2485         struct nfs4_ol_stateid *stp;
2486         __be32 ret;
2487
2488         dprintk("NFSD: nfs4_share_conflict\n");
2489
2490         fp = find_file(ino);
2491         if (!fp)
2492                 return nfs_ok;
2493         ret = nfserr_locked;
2494         /* Search for conflicting share reservations */
2495         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2496                 if (test_deny(deny_type, stp) ||
2497                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2498                         goto out;
2499         }
2500         ret = nfs_ok;
2501 out:
2502         put_nfs4_file(fp);
2503         return ret;
2504 }
2505
2506 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2507 {
2508         /* We're assuming the state code never drops its reference
2509          * without first removing the lease.  Since we're in this lease
2510          * callback (and since the lease code is serialized by the kernel
2511          * lock) we know the server hasn't removed the lease yet, we know
2512          * it's safe to take a reference: */
2513         atomic_inc(&dp->dl_count);
2514
2515         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2516
2517         /* only place dl_time is set. protected by lock_flocks*/
2518         dp->dl_time = get_seconds();
2519
2520         nfsd4_cb_recall(dp);
2521 }
2522
2523 /* Called from break_lease() with lock_flocks() held. */
2524 static void nfsd_break_deleg_cb(struct file_lock *fl)
2525 {
2526         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2527         struct nfs4_delegation *dp;
2528
2529         BUG_ON(!fp);
2530         /* We assume break_lease is only called once per lease: */
2531         BUG_ON(fp->fi_had_conflict);
2532         /*
2533          * We don't want the locks code to timeout the lease for us;
2534          * we'll remove it ourself if a delegation isn't returned
2535          * in time:
2536          */
2537         fl->fl_break_time = 0;
2538
2539         spin_lock(&recall_lock);
2540         fp->fi_had_conflict = true;
2541         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2542                 nfsd_break_one_deleg(dp);
2543         spin_unlock(&recall_lock);
2544 }
2545
2546 static
2547 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2548 {
2549         if (arg & F_UNLCK)
2550                 return lease_modify(onlist, arg);
2551         else
2552                 return -EAGAIN;
2553 }
2554
2555 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2556         .lm_break = nfsd_break_deleg_cb,
2557         .lm_change = nfsd_change_deleg_cb,
2558 };
2559
2560 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2561 {
2562         if (nfsd4_has_session(cstate))
2563                 return nfs_ok;
2564         if (seqid == so->so_seqid - 1)
2565                 return nfserr_replay_me;
2566         if (seqid == so->so_seqid)
2567                 return nfs_ok;
2568         return nfserr_bad_seqid;
2569 }
2570
2571 __be32
2572 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2573                     struct nfsd4_open *open)
2574 {
2575         clientid_t *clientid = &open->op_clientid;
2576         struct nfs4_client *clp = NULL;
2577         unsigned int strhashval;
2578         struct nfs4_openowner *oo = NULL;
2579         __be32 status;
2580
2581         if (STALE_CLIENTID(&open->op_clientid))
2582                 return nfserr_stale_clientid;
2583         /*
2584          * In case we need it later, after we've already created the
2585          * file and don't want to risk a further failure:
2586          */
2587         open->op_file = nfsd4_alloc_file();
2588         if (open->op_file == NULL)
2589                 return nfserr_jukebox;
2590
2591         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2592         oo = find_openstateowner_str(strhashval, open);
2593         open->op_openowner = oo;
2594         if (!oo) {
2595                 clp = find_confirmed_client(clientid);
2596                 if (clp == NULL)
2597                         return nfserr_expired;
2598                 goto new_owner;
2599         }
2600         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2601                 /* Replace unconfirmed owners without checking for replay. */
2602                 clp = oo->oo_owner.so_client;
2603                 release_openowner(oo);
2604                 open->op_openowner = NULL;
2605                 goto new_owner;
2606         }
2607         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2608         if (status)
2609                 return status;
2610         clp = oo->oo_owner.so_client;
2611         goto alloc_stateid;
2612 new_owner:
2613         oo = alloc_init_open_stateowner(strhashval, clp, open);
2614         if (oo == NULL)
2615                 return nfserr_jukebox;
2616         open->op_openowner = oo;
2617 alloc_stateid:
2618         open->op_stp = nfs4_alloc_stateid(clp);
2619         if (!open->op_stp)
2620                 return nfserr_jukebox;
2621         return nfs_ok;
2622 }
2623
2624 static inline __be32
2625 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2626 {
2627         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2628                 return nfserr_openmode;
2629         else
2630                 return nfs_ok;
2631 }
2632
2633 static int share_access_to_flags(u32 share_access)
2634 {
2635         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2636 }
2637
2638 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2639 {
2640         struct nfs4_stid *ret;
2641
2642         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2643         if (!ret)
2644                 return NULL;
2645         return delegstateid(ret);
2646 }
2647
2648 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2649 {
2650         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2651                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2652 }
2653
2654 static __be32
2655 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2656                 struct nfs4_delegation **dp)
2657 {
2658         int flags;
2659         __be32 status = nfserr_bad_stateid;
2660
2661         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2662         if (*dp == NULL)
2663                 goto out;
2664         flags = share_access_to_flags(open->op_share_access);
2665         status = nfs4_check_delegmode(*dp, flags);
2666         if (status)
2667                 *dp = NULL;
2668 out:
2669         if (!nfsd4_is_deleg_cur(open))
2670                 return nfs_ok;
2671         if (status)
2672                 return status;
2673         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2674         return nfs_ok;
2675 }
2676
2677 static __be32
2678 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2679 {
2680         struct nfs4_ol_stateid *local;
2681         struct nfs4_openowner *oo = open->op_openowner;
2682
2683         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2684                 /* ignore lock owners */
2685                 if (local->st_stateowner->so_is_open_owner == 0)
2686                         continue;
2687                 /* remember if we have seen this open owner */
2688                 if (local->st_stateowner == &oo->oo_owner)
2689                         *stpp = local;
2690                 /* check for conflicting share reservations */
2691                 if (!test_share(local, open))
2692                         return nfserr_share_denied;
2693         }
2694         return nfs_ok;
2695 }
2696
2697 static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
2698 {
2699         kmem_cache_free(stateid_slab, s);
2700 }
2701
2702 static inline int nfs4_access_to_access(u32 nfs4_access)
2703 {
2704         int flags = 0;
2705
2706         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2707                 flags |= NFSD_MAY_READ;
2708         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2709                 flags |= NFSD_MAY_WRITE;
2710         return flags;
2711 }
2712
2713 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2714                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2715 {
2716         __be32 status;
2717         int oflag = nfs4_access_to_omode(open->op_share_access);
2718         int access = nfs4_access_to_access(open->op_share_access);
2719
2720         if (!fp->fi_fds[oflag]) {
2721                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2722                         &fp->fi_fds[oflag]);
2723                 if (status)
2724                         return status;
2725         }
2726         nfs4_file_get_access(fp, oflag);
2727
2728         return nfs_ok;
2729 }
2730
2731 static inline __be32
2732 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2733                 struct nfsd4_open *open)
2734 {
2735         struct iattr iattr = {
2736                 .ia_valid = ATTR_SIZE,
2737                 .ia_size = 0,
2738         };
2739         if (!open->op_truncate)
2740                 return 0;
2741         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2742                 return nfserr_inval;
2743         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2744 }
2745
2746 static __be32
2747 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)
2748 {
2749         u32 op_share_access = open->op_share_access;
2750         bool new_access;
2751         __be32 status;
2752
2753         new_access = !test_access(op_share_access, stp);
2754         if (new_access) {
2755                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2756                 if (status)
2757                         return status;
2758         }
2759         status = nfsd4_truncate(rqstp, cur_fh, open);
2760         if (status) {
2761                 if (new_access) {
2762                         int oflag = nfs4_access_to_omode(op_share_access);
2763                         nfs4_file_put_access(fp, oflag);
2764                 }
2765                 return status;
2766         }
2767         /* remember the open */
2768         set_access(op_share_access, stp);
2769         set_deny(open->op_share_deny, stp);
2770
2771         return nfs_ok;
2772 }
2773
2774
2775 static void
2776 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2777 {
2778         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2779 }
2780
2781 /* Should we give out recallable state?: */
2782 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2783 {
2784         if (clp->cl_cb_state == NFSD4_CB_UP)
2785                 return true;
2786         /*
2787          * In the sessions case, since we don't have to establish a
2788          * separate connection for callbacks, we assume it's OK
2789          * until we hear otherwise:
2790          */
2791         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2792 }
2793
2794 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2795 {
2796         struct file_lock *fl;
2797
2798         fl = locks_alloc_lock();
2799         if (!fl)
2800                 return NULL;
2801         locks_init_lock(fl);
2802         fl->fl_lmops = &nfsd_lease_mng_ops;
2803         fl->fl_flags = FL_LEASE;
2804         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2805         fl->fl_end = OFFSET_MAX;
2806         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2807         fl->fl_pid = current->tgid;
2808         return fl;
2809 }
2810
2811 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2812 {
2813         struct nfs4_file *fp = dp->dl_file;
2814         struct file_lock *fl;
2815         int status;
2816
2817         fl = nfs4_alloc_init_lease(dp, flag);
2818         if (!fl)
2819                 return -ENOMEM;
2820         fl->fl_file = find_readable_file(fp);
2821         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2822         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2823         if (status) {
2824                 list_del_init(&dp->dl_perclnt);
2825                 locks_free_lock(fl);
2826                 return -ENOMEM;
2827         }
2828         fp->fi_lease = fl;
2829         fp->fi_deleg_file = fl->fl_file;
2830         get_file(fp->fi_deleg_file);
2831         atomic_set(&fp->fi_delegees, 1);
2832         list_add(&dp->dl_perfile, &fp->fi_delegations);
2833         return 0;
2834 }
2835
2836 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2837 {
2838         struct nfs4_file *fp = dp->dl_file;
2839
2840         if (!fp->fi_lease)
2841                 return nfs4_setlease(dp, flag);
2842         spin_lock(&recall_lock);
2843         if (fp->fi_had_conflict) {
2844                 spin_unlock(&recall_lock);
2845                 return -EAGAIN;
2846         }
2847         atomic_inc(&fp->fi_delegees);
2848         list_add(&dp->dl_perfile, &fp->fi_delegations);
2849         spin_unlock(&recall_lock);
2850         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2851         return 0;
2852 }
2853
2854 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2855 {
2856         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2857         if (status == -EAGAIN)
2858                 open->op_why_no_deleg = WND4_CONTENTION;
2859         else {
2860                 open->op_why_no_deleg = WND4_RESOURCE;
2861                 switch (open->op_deleg_want) {
2862                 case NFS4_SHARE_WANT_READ_DELEG:
2863                 case NFS4_SHARE_WANT_WRITE_DELEG:
2864                 case NFS4_SHARE_WANT_ANY_DELEG:
2865                         break;
2866                 case NFS4_SHARE_WANT_CANCEL:
2867                         open->op_why_no_deleg = WND4_CANCELLED;
2868                         break;
2869                 case NFS4_SHARE_WANT_NO_DELEG:
2870                         BUG();  /* not supposed to get here */
2871                 }
2872         }
2873 }
2874
2875 /*
2876  * Attempt to hand out a delegation.
2877  */
2878 static void
2879 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2880 {
2881         struct nfs4_delegation *dp;
2882         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2883         int cb_up;
2884         int status = 0, flag = 0;
2885
2886         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2887         flag = NFS4_OPEN_DELEGATE_NONE;
2888         open->op_recall = 0;
2889         switch (open->op_claim_type) {
2890                 case NFS4_OPEN_CLAIM_PREVIOUS:
2891                         if (!cb_up)
2892                                 open->op_recall = 1;
2893                         flag = open->op_delegate_type;
2894                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2895                                 goto out;
2896                         break;
2897                 case NFS4_OPEN_CLAIM_NULL:
2898                         /* Let's not give out any delegations till everyone's
2899                          * had the chance to reclaim theirs.... */
2900                         if (locks_in_grace())
2901                                 goto out;
2902                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2903                                 goto out;
2904                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2905                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2906                         else
2907                                 flag = NFS4_OPEN_DELEGATE_READ;
2908                         break;
2909                 default:
2910                         goto out;
2911         }
2912
2913         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2914         if (dp == NULL)
2915                 goto out_no_deleg;
2916         status = nfs4_set_delegation(dp, flag);
2917         if (status)
2918                 goto out_free;
2919
2920         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2921
2922         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2923                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2924 out:
2925         open->op_delegate_type = flag;
2926         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2927                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2928                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2929                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2930
2931                 /* 4.1 client asking for a delegation? */
2932                 if (open->op_deleg_want)
2933                         nfsd4_open_deleg_none_ext(open, status);
2934         }
2935         return;
2936 out_free:
2937         nfs4_put_delegation(dp);
2938 out_no_deleg:
2939         flag = NFS4_OPEN_DELEGATE_NONE;
2940         goto out;
2941 }
2942
2943 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
2944                                         struct nfs4_delegation *dp)
2945 {
2946         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
2947             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2948                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2949                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
2950         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
2951                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2952                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2953                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
2954         }
2955         /* Otherwise the client must be confused wanting a delegation
2956          * it already has, therefore we don't return
2957          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
2958          */
2959 }
2960
2961 /*
2962  * called with nfs4_lock_state() held.
2963  */
2964 __be32
2965 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2966 {
2967         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2968         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
2969         struct nfs4_file *fp = NULL;
2970         struct inode *ino = current_fh->fh_dentry->d_inode;
2971         struct nfs4_ol_stateid *stp = NULL;
2972         struct nfs4_delegation *dp = NULL;
2973         __be32 status;
2974
2975         /*
2976          * Lookup file; if found, lookup stateid and check open request,
2977          * and check for delegations in the process of being recalled.
2978          * If not found, create the nfs4_file struct
2979          */
2980         fp = find_file(ino);
2981         if (fp) {
2982                 if ((status = nfs4_check_open(fp, open, &stp)))
2983                         goto out;
2984                 status = nfs4_check_deleg(cl, fp, open, &dp);
2985                 if (status)
2986                         goto out;
2987         } else {
2988                 status = nfserr_bad_stateid;
2989                 if (nfsd4_is_deleg_cur(open))
2990                         goto out;
2991                 status = nfserr_jukebox;
2992                 fp = open->op_file;
2993                 open->op_file = NULL;
2994                 nfsd4_init_file(fp, ino);
2995         }
2996
2997         /*
2998          * OPEN the file, or upgrade an existing OPEN.
2999          * If truncate fails, the OPEN fails.
3000          */
3001         if (stp) {
3002                 /* Stateid was found, this is an OPEN upgrade */
3003                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3004                 if (status)
3005                         goto out;
3006         } else {
3007                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3008                 if (status)
3009                         goto out;
3010                 stp = open->op_stp;
3011                 open->op_stp = NULL;
3012                 init_open_stateid(stp, fp, open);
3013                 status = nfsd4_truncate(rqstp, current_fh, open);
3014                 if (status) {
3015                         release_open_stateid(stp);
3016                         goto out;
3017                 }
3018         }
3019         update_stateid(&stp->st_stid.sc_stateid);
3020         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3021
3022         if (nfsd4_has_session(&resp->cstate)) {
3023                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3024
3025                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3026                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3027                         open->op_why_no_deleg = WND4_NOT_WANTED;
3028                         goto nodeleg;
3029                 }
3030         }
3031
3032         /*
3033         * Attempt to hand out a delegation. No error return, because the
3034         * OPEN succeeds even if we fail.
3035         */
3036         nfs4_open_delegation(current_fh, open, stp);
3037 nodeleg:
3038         status = nfs_ok;
3039
3040         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3041                 STATEID_VAL(&stp->st_stid.sc_stateid));
3042 out:
3043         /* 4.1 client trying to upgrade/downgrade delegation? */
3044         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3045             open->op_deleg_want)
3046                 nfsd4_deleg_xgrade_none_ext(open, dp);
3047
3048         if (fp)
3049                 put_nfs4_file(fp);
3050         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3051                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3052         /*
3053         * To finish the open response, we just need to set the rflags.
3054         */
3055         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3056         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3057             !nfsd4_has_session(&resp->cstate))
3058                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3059
3060         return status;
3061 }
3062
3063 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3064 {
3065         if (open->op_openowner) {
3066                 struct nfs4_openowner *oo = open->op_openowner;
3067
3068                 if (!list_empty(&oo->oo_owner.so_stateids))
3069                         list_del_init(&oo->oo_close_lru);
3070                 if (oo->oo_flags & NFS4_OO_NEW) {
3071                         if (status) {
3072                                 release_openowner(oo);
3073                                 open->op_openowner = NULL;
3074                         } else
3075                                 oo->oo_flags &= ~NFS4_OO_NEW;
3076                 }
3077         }
3078         if (open->op_file)
3079                 nfsd4_free_file(open->op_file);
3080         if (open->op_stp)
3081                 nfs4_free_stateid(open->op_stp);
3082 }
3083
3084 __be32
3085 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3086             clientid_t *clid)
3087 {
3088         struct nfs4_client *clp;
3089         __be32 status;
3090
3091         nfs4_lock_state();
3092         dprintk("process_renew(%08x/%08x): starting\n",
3093                         clid->cl_boot, clid->cl_id);
3094         status = nfserr_stale_clientid;
3095         if (STALE_CLIENTID(clid))
3096                 goto out;
3097         clp = find_confirmed_client(clid);
3098         status = nfserr_expired;
3099         if (clp == NULL) {
3100                 /* We assume the client took too long to RENEW. */
3101                 dprintk("nfsd4_renew: clientid not found!\n");
3102                 goto out;
3103         }
3104         status = nfserr_cb_path_down;
3105         if (!list_empty(&clp->cl_delegations)
3106                         && clp->cl_cb_state != NFSD4_CB_UP)
3107                 goto out;
3108         status = nfs_ok;
3109 out:
3110         nfs4_unlock_state();
3111         return status;
3112 }
3113
3114 static struct lock_manager nfsd4_manager = {
3115 };
3116
3117 static bool grace_ended;
3118
3119 static void
3120 nfsd4_end_grace(void)
3121 {
3122         /* do nothing if grace period already ended */
3123         if (grace_ended)
3124                 return;
3125
3126         dprintk("NFSD: end of grace period\n");
3127         grace_ended = true;
3128         nfsd4_record_grace_done(&init_net, boot_time);
3129         locks_end_grace(&nfsd4_manager);
3130         /*
3131          * Now that every NFSv4 client has had the chance to recover and
3132          * to see the (possibly new, possibly shorter) lease time, we
3133          * can safely set the next grace time to the current lease time:
3134          */
3135         nfsd4_grace = nfsd4_lease;
3136 }
3137
3138 static time_t
3139 nfs4_laundromat(void)
3140 {
3141         struct nfs4_client *clp;
3142         struct nfs4_openowner *oo;
3143         struct nfs4_delegation *dp;
3144         struct list_head *pos, *next, reaplist;
3145         time_t cutoff = get_seconds() - nfsd4_lease;
3146         time_t t, clientid_val = nfsd4_lease;
3147         time_t u, test_val = nfsd4_lease;
3148
3149         nfs4_lock_state();
3150
3151         dprintk("NFSD: laundromat service - starting\n");
3152         nfsd4_end_grace();
3153         INIT_LIST_HEAD(&reaplist);
3154         spin_lock(&client_lock);
3155         list_for_each_safe(pos, next, &client_lru) {
3156                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3157                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3158                         t = clp->cl_time - cutoff;
3159                         if (clientid_val > t)
3160                                 clientid_val = t;
3161                         break;
3162                 }
3163                 if (atomic_read(&clp->cl_refcount)) {
3164                         dprintk("NFSD: client in use (clientid %08x)\n",
3165                                 clp->cl_clientid.cl_id);
3166                         continue;
3167                 }
3168                 unhash_client_locked(clp);
3169                 list_add(&clp->cl_lru, &reaplist);
3170         }
3171         spin_unlock(&client_lock);
3172         list_for_each_safe(pos, next, &reaplist) {
3173                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3174                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3175                         clp->cl_clientid.cl_id);
3176                 nfsd4_client_record_remove(clp);
3177                 expire_client(clp);
3178         }
3179         spin_lock(&recall_lock);
3180         list_for_each_safe(pos, next, &del_recall_lru) {
3181                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3182                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3183                         u = dp->dl_time - cutoff;
3184                         if (test_val > u)
3185                                 test_val = u;
3186                         break;
3187                 }
3188                 list_move(&dp->dl_recall_lru, &reaplist);
3189         }
3190         spin_unlock(&recall_lock);
3191         list_for_each_safe(pos, next, &reaplist) {
3192                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3193                 unhash_delegation(dp);
3194         }
3195         test_val = nfsd4_lease;
3196         list_for_each_safe(pos, next, &close_lru) {
3197                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3198                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3199                         u = oo->oo_time - cutoff;
3200                         if (test_val > u)
3201                                 test_val = u;
3202                         break;
3203                 }
3204                 release_openowner(oo);
3205         }
3206         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3207                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3208         nfs4_unlock_state();
3209         return clientid_val;
3210 }
3211
3212 static struct workqueue_struct *laundry_wq;
3213 static void laundromat_main(struct work_struct *);
3214 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3215
3216 static void
3217 laundromat_main(struct work_struct *not_used)
3218 {
3219         time_t t;
3220
3221         t = nfs4_laundromat();
3222         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3223         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3224 }
3225
3226 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3227 {
3228         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3229                 return nfserr_bad_stateid;
3230         return nfs_ok;
3231 }
3232
3233 static int
3234 STALE_STATEID(stateid_t *stateid)
3235 {
3236         if (stateid->si_opaque.so_clid.cl_boot == boot_time)
3237                 return 0;
3238         dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3239                 STATEID_VAL(stateid));
3240         return 1;
3241 }
3242
3243 static inline int
3244 access_permit_read(struct nfs4_ol_stateid *stp)
3245 {
3246         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3247                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3248                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3249 }
3250
3251 static inline int
3252 access_permit_write(struct nfs4_ol_stateid *stp)
3253 {
3254         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3255                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3256 }
3257
3258 static
3259 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3260 {
3261         __be32 status = nfserr_openmode;
3262
3263         /* For lock stateid's, we test the parent open, not the lock: */
3264         if (stp->st_openstp)
3265                 stp = stp->st_openstp;
3266         if ((flags & WR_STATE) && !access_permit_write(stp))
3267                 goto out;
3268         if ((flags & RD_STATE) && !access_permit_read(stp))
3269                 goto out;
3270         status = nfs_ok;
3271 out:
3272         return status;
3273 }
3274
3275 static inline __be32
3276 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
3277 {
3278         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3279                 return nfs_ok;
3280         else if (locks_in_grace()) {
3281                 /* Answer in remaining cases depends on existence of
3282                  * conflicting state; so we must wait out the grace period. */
3283                 return nfserr_grace;
3284         } else if (flags & WR_STATE)
3285                 return nfs4_share_conflict(current_fh,
3286                                 NFS4_SHARE_DENY_WRITE);
3287         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3288                 return nfs4_share_conflict(current_fh,
3289                                 NFS4_SHARE_DENY_READ);
3290 }
3291
3292 /*
3293  * Allow READ/WRITE during grace period on recovered state only for files
3294  * that are not able to provide mandatory locking.
3295  */
3296 static inline int
3297 grace_disallows_io(struct inode *inode)
3298 {
3299         return locks_in_grace() && mandatory_lock(inode);
3300 }
3301
3302 /* Returns true iff a is later than b: */
3303 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3304 {
3305         return (s32)a->si_generation - (s32)b->si_generation > 0;
3306 }
3307
3308 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3309 {
3310         /*
3311          * When sessions are used the stateid generation number is ignored
3312          * when it is zero.
3313          */
3314         if (has_session && in->si_generation == 0)
3315                 return nfs_ok;
3316
3317         if (in->si_generation == ref->si_generation)
3318                 return nfs_ok;
3319
3320         /* If the client sends us a stateid from the future, it's buggy: */
3321         if (stateid_generation_after(in, ref))
3322                 return nfserr_bad_stateid;
3323         /*
3324          * However, we could see a stateid from the past, even from a
3325          * non-buggy client.  For example, if the client sends a lock
3326          * while some IO is outstanding, the lock may bump si_generation
3327          * while the IO is still in flight.  The client could avoid that
3328          * situation by waiting for responses on all the IO requests,
3329          * but better performance may result in retrying IO that
3330          * receives an old_stateid error if requests are rarely
3331          * reordered in flight:
3332          */
3333         return nfserr_old_stateid;
3334 }
3335
3336 __be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3337 {
3338         struct nfs4_stid *s;
3339         struct nfs4_ol_stateid *ols;
3340         __be32 status;
3341
3342         if (STALE_STATEID(stateid))
3343                 return nfserr_stale_stateid;
3344
3345         s = find_stateid(cl, stateid);
3346         if (!s)
3347                  return nfserr_stale_stateid;
3348         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3349         if (status)
3350                 return status;
3351         if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3352                 return nfs_ok;
3353         ols = openlockstateid(s);
3354         if (ols->st_stateowner->so_is_open_owner
3355             && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3356                 return nfserr_bad_stateid;
3357         return nfs_ok;
3358 }
3359
3360 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
3361 {
3362         struct nfs4_client *cl;
3363
3364         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3365                 return nfserr_bad_stateid;
3366         if (STALE_STATEID(stateid))
3367                 return nfserr_stale_stateid;
3368         cl = find_confirmed_client(&stateid->si_opaque.so_clid);
3369         if (!cl)
3370                 return nfserr_expired;
3371         *s = find_stateid_by_type(cl, stateid, typemask);
3372         if (!*s)
3373                 return nfserr_bad_stateid;
3374         return nfs_ok;
3375
3376 }
3377
3378 /*
3379 * Checks for stateid operations
3380 */
3381 __be32
3382 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3383                            stateid_t *stateid, int flags, struct file **filpp)
3384 {
3385         struct nfs4_stid *s;
3386         struct nfs4_ol_stateid *stp = NULL;
3387         struct nfs4_delegation *dp = NULL;
3388         struct svc_fh *current_fh = &cstate->current_fh;
3389         struct inode *ino = current_fh->fh_dentry->d_inode;
3390         __be32 status;
3391
3392         if (filpp)
3393                 *filpp = NULL;
3394
3395         if (grace_disallows_io(ino))
3396                 return nfserr_grace;
3397
3398         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3399                 return check_special_stateids(current_fh, stateid, flags);
3400
3401         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
3402         if (status)
3403                 return status;
3404         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3405         if (status)
3406                 goto out;
3407         switch (s->sc_type) {
3408         case NFS4_DELEG_STID:
3409                 dp = delegstateid(s);
3410                 status = nfs4_check_delegmode(dp, flags);
3411                 if (status)
3412                         goto out;
3413                 if (filpp) {
3414                         *filpp = dp->dl_file->fi_deleg_file;
3415                         BUG_ON(!*filpp);
3416                 }
3417                 break;
3418         case NFS4_OPEN_STID:
3419         case NFS4_LOCK_STID:
3420                 stp = openlockstateid(s);
3421                 status = nfs4_check_fh(current_fh, stp);
3422                 if (status)
3423                         goto out;
3424                 if (stp->st_stateowner->so_is_open_owner
3425                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3426                         goto out;
3427                 status = nfs4_check_openmode(stp, flags);
3428                 if (status)
3429                         goto out;
3430                 if (filpp) {
3431                         if (flags & RD_STATE)
3432                                 *filpp = find_readable_file(stp->st_file);
3433                         else
3434                                 *filpp = find_writeable_file(stp->st_file);
3435                 }
3436                 break;
3437         default:
3438                 return nfserr_bad_stateid;
3439         }
3440         status = nfs_ok;
3441 out:
3442         return status;
3443 }
3444
3445 static __be32
3446 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3447 {
3448         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3449                 return nfserr_locks_held;
3450         release_lock_stateid(stp);
3451         return nfs_ok;
3452 }
3453
3454 /*
3455  * Test if the stateid is valid
3456  */
3457 __be32
3458 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3459                    struct nfsd4_test_stateid *test_stateid)
3460 {
3461         struct nfsd4_test_stateid_id *stateid;
3462         struct nfs4_client *cl = cstate->session->se_client;
3463
3464         nfs4_lock_state();
3465         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3466                 stateid->ts_id_status = nfs4_validate_stateid(cl, &stateid->ts_id_stateid);
3467         nfs4_unlock_state();
3468
3469         return nfs_ok;
3470 }
3471
3472 __be32
3473 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3474                    struct nfsd4_free_stateid *free_stateid)
3475 {
3476         stateid_t *stateid = &free_stateid->fr_stateid;
3477         struct nfs4_stid *s;
3478         struct nfs4_client *cl = cstate->session->se_client;
3479         __be32 ret = nfserr_bad_stateid;
3480
3481         nfs4_lock_state();
3482         s = find_stateid(cl, stateid);
3483         if (!s)
3484                 goto out;
3485         switch (s->sc_type) {
3486         case NFS4_DELEG_STID:
3487                 ret = nfserr_locks_held;
3488                 goto out;
3489         case NFS4_OPEN_STID:
3490         case NFS4_LOCK_STID:
3491                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3492                 if (ret)
3493                         goto out;
3494                 if (s->sc_type == NFS4_LOCK_STID)
3495                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3496                 else
3497                         ret = nfserr_locks_held;
3498                 break;
3499         default:
3500                 ret = nfserr_bad_stateid;
3501         }
3502 out:
3503         nfs4_unlock_state();
3504         return ret;
3505 }
3506
3507 static inline int
3508 setlkflg (int type)
3509 {
3510         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3511                 RD_STATE : WR_STATE;
3512 }
3513
3514 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3515 {
3516         struct svc_fh *current_fh = &cstate->current_fh;
3517         struct nfs4_stateowner *sop = stp->st_stateowner;
3518         __be32 status;
3519
3520         status = nfsd4_check_seqid(cstate, sop, seqid);
3521         if (status)
3522                 return status;
3523         if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3524                 /*
3525                  * "Closed" stateid's exist *only* to return
3526                  * nfserr_replay_me from the previous step.
3527                  */
3528                 return nfserr_bad_stateid;
3529         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3530         if (status)
3531                 return status;
3532         return nfs4_check_fh(current_fh, stp);
3533 }
3534
3535 /*
3536  * Checks for sequence id mutating operations.
3537  */
3538 static __be32
3539 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3540                          stateid_t *stateid, char typemask,
3541                          struct nfs4_ol_stateid **stpp)
3542 {
3543         __be32 status;
3544         struct nfs4_stid *s;
3545
3546         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3547                 seqid, STATEID_VAL(stateid));
3548
3549         *stpp = NULL;
3550         status = nfsd4_lookup_stateid(stateid, typemask, &s);
3551         if (status)
3552                 return status;
3553         *stpp = openlockstateid(s);
3554         cstate->replay_owner = (*stpp)->st_stateowner;
3555
3556         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3557 }
3558
3559 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3560 {
3561         __be32 status;
3562         struct nfs4_openowner *oo;
3563
3564         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3565                                                 NFS4_OPEN_STID, stpp);
3566         if (status)
3567                 return status;
3568         oo = openowner((*stpp)->st_stateowner);
3569         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3570                 return nfserr_bad_stateid;
3571         return nfs_ok;
3572 }
3573
3574 __be32
3575 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3576                    struct nfsd4_open_confirm *oc)
3577 {
3578         __be32 status;
3579         struct nfs4_openowner *oo;
3580         struct nfs4_ol_stateid *stp;
3581
3582         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3583                         (int)cstate->current_fh.fh_dentry->d_name.len,
3584                         cstate->current_fh.fh_dentry->d_name.name);
3585
3586         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3587         if (status)
3588                 return status;
3589
3590         nfs4_lock_state();
3591
3592         status = nfs4_preprocess_seqid_op(cstate,
3593                                         oc->oc_seqid, &oc->oc_req_stateid,
3594                                         NFS4_OPEN_STID, &stp);
3595         if (status)
3596                 goto out;
3597         oo = openowner(stp->st_stateowner);
3598         status = nfserr_bad_stateid;
3599         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3600                 goto out;
3601         oo->oo_flags |= NFS4_OO_CONFIRMED;
3602         update_stateid(&stp->st_stid.sc_stateid);
3603         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3604         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3605                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3606
3607         nfsd4_client_record_create(oo->oo_owner.so_client);
3608         status = nfs_ok;
3609 out:
3610         if (!cstate->replay_owner)
3611                 nfs4_unlock_state();
3612         return status;
3613 }
3614
3615 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3616 {
3617         if (!test_access(access, stp))
3618                 return;
3619         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3620         clear_access(access, stp);
3621 }
3622
3623 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3624 {
3625         switch (to_access) {
3626         case NFS4_SHARE_ACCESS_READ:
3627                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3628                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3629                 break;
3630         case NFS4_SHARE_ACCESS_WRITE:
3631                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3632                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3633                 break;
3634         case NFS4_SHARE_ACCESS_BOTH:
3635                 break;
3636         default:
3637                 BUG();
3638         }
3639 }
3640
3641 static void
3642 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3643 {
3644         int i;
3645         for (i = 0; i < 4; i++) {
3646                 if ((i & deny) != i)
3647                         clear_deny(i, stp);
3648         }
3649 }
3650
3651 __be32
3652 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3653                      struct nfsd4_compound_state *cstate,
3654                      struct nfsd4_open_downgrade *od)
3655 {
3656         __be32 status;
3657         struct nfs4_ol_stateid *stp;
3658
3659         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3660                         (int)cstate->current_fh.fh_dentry->d_name.len,
3661                         cstate->current_fh.fh_dentry->d_name.name);
3662
3663         /* We don't yet support WANT bits: */
3664         if (od->od_deleg_want)
3665                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3666                         od->od_deleg_want);
3667
3668         nfs4_lock_state();
3669         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3670                                         &od->od_stateid, &stp);
3671         if (status)
3672                 goto out;
3673         status = nfserr_inval;
3674         if (!test_access(od->od_share_access, stp)) {
3675                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3676                         stp->st_access_bmap, od->od_share_access);
3677                 goto out;
3678         }
3679         if (!test_deny(od->od_share_deny, stp)) {
3680                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3681                         stp->st_deny_bmap, od->od_share_deny);
3682                 goto out;
3683         }
3684         nfs4_stateid_downgrade(stp, od->od_share_access);
3685
3686         reset_union_bmap_deny(od->od_share_deny, stp);
3687
3688         update_stateid(&stp->st_stid.sc_stateid);
3689         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3690         status = nfs_ok;
3691 out:
3692         if (!cstate->replay_owner)
3693                 nfs4_unlock_state();
3694         return status;
3695 }
3696
3697 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3698 {
3699         struct nfs4_openowner *oo;
3700         struct nfs4_ol_stateid *s;
3701
3702         if (!so->so_is_open_owner)
3703                 return;
3704         oo = openowner(so);
3705         s = oo->oo_last_closed_stid;
3706         if (!s)
3707                 return;
3708         if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3709                 /* Release the last_closed_stid on the next seqid bump: */
3710                 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3711                 return;
3712         }
3713         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3714         release_last_closed_stateid(oo);
3715 }
3716
3717 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3718 {
3719         unhash_open_stateid(s);
3720         s->st_stid.sc_type = NFS4_CLOSED_STID;
3721 }
3722
3723 /*
3724  * nfs4_unlock_state() called after encode
3725  */
3726 __be32
3727 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3728             struct nfsd4_close *close)
3729 {
3730         __be32 status;
3731         struct nfs4_openowner *oo;
3732         struct nfs4_ol_stateid *stp;
3733
3734         dprintk("NFSD: nfsd4_close on file %.*s\n",
3735                         (int)cstate->current_fh.fh_dentry->d_name.len,
3736                         cstate->current_fh.fh_dentry->d_name.name);
3737
3738         nfs4_lock_state();
3739         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3740                                         &close->cl_stateid,
3741                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3742                                         &stp);
3743         if (status)
3744                 goto out;
3745         oo = openowner(stp->st_stateowner);
3746         status = nfs_ok;
3747         update_stateid(&stp->st_stid.sc_stateid);
3748         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3749
3750         nfsd4_close_open_stateid(stp);
3751         oo->oo_last_closed_stid = stp;
3752
3753         /* place unused nfs4_stateowners on so_close_lru list to be
3754          * released by the laundromat service after the lease period
3755          * to enable us to handle CLOSE replay
3756          */
3757         if (list_empty(&oo->oo_owner.so_stateids))
3758                 move_to_close_lru(oo);
3759 out:
3760         if (!cstate->replay_owner)
3761                 nfs4_unlock_state();
3762         return status;
3763 }
3764
3765 __be32
3766 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3767                   struct nfsd4_delegreturn *dr)
3768 {
3769         struct nfs4_delegation *dp;
3770         stateid_t *stateid = &dr->dr_stateid;
3771         struct nfs4_stid *s;
3772         struct inode *inode;
3773         __be32 status;
3774
3775         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3776                 return status;
3777         inode = cstate->current_fh.fh_dentry->d_inode;
3778
3779         nfs4_lock_state();
3780         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
3781         if (status)
3782                 goto out;
3783         dp = delegstateid(s);
3784         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3785         if (status)
3786                 goto out;
3787
3788         unhash_delegation(dp);
3789 out:
3790         nfs4_unlock_state();
3791
3792         return status;
3793 }
3794
3795
3796 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
3797
3798 #define LOCKOWNER_INO_HASH_BITS 8
3799 #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3800 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3801
3802 static inline u64
3803 end_offset(u64 start, u64 len)
3804 {
3805         u64 end;
3806
3807         end = start + len;
3808         return end >= start ? end: NFS4_MAX_UINT64;
3809 }
3810
3811 /* last octet in a range */
3812 static inline u64
3813 last_byte_offset(u64 start, u64 len)
3814 {
3815         u64 end;
3816
3817         BUG_ON(!len);
3818         end = start + len;
3819         return end > start ? end - 1: NFS4_MAX_UINT64;
3820 }
3821
3822 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3823 {
3824         return (file_hashval(inode) + cl_id
3825                         + opaque_hashval(ownername->data, ownername->len))
3826                 & LOCKOWNER_INO_HASH_MASK;
3827 }
3828
3829 static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
3830
3831 /*
3832  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3833  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3834  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
3835  * locking, this prevents us from being completely protocol-compliant.  The
3836  * real solution to this problem is to start using unsigned file offsets in
3837  * the VFS, but this is a very deep change!
3838  */
3839 static inline void
3840 nfs4_transform_lock_offset(struct file_lock *lock)
3841 {
3842         if (lock->fl_start < 0)
3843                 lock->fl_start = OFFSET_MAX;
3844         if (lock->fl_end < 0)
3845                 lock->fl_end = OFFSET_MAX;
3846 }
3847
3848 /* Hack!: For now, we're defining this just so we can use a pointer to it
3849  * as a unique cookie to identify our (NFSv4's) posix locks. */
3850 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
3851 };
3852
3853 static inline void
3854 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3855 {
3856         struct nfs4_lockowner *lo;
3857
3858         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3859                 lo = (struct nfs4_lockowner *) fl->fl_owner;
3860                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3861                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
3862                 if (!deny->ld_owner.data)
3863                         /* We just don't care that much */
3864                         goto nevermind;
3865                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3866                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3867         } else {
3868 nevermind:
3869                 deny->ld_owner.len = 0;
3870                 deny->ld_owner.data = NULL;
3871                 deny->ld_clientid.cl_boot = 0;
3872                 deny->ld_clientid.cl_id = 0;
3873         }
3874         deny->ld_start = fl->fl_start;
3875         deny->ld_length = NFS4_MAX_UINT64;
3876         if (fl->fl_end != NFS4_MAX_UINT64)
3877                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3878         deny->ld_type = NFS4_READ_LT;
3879         if (fl->fl_type != F_RDLCK)
3880                 deny->ld_type = NFS4_WRITE_LT;
3881 }
3882
3883 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3884 {
3885         struct nfs4_ol_stateid *lst;
3886
3887         if (!same_owner_str(&lo->lo_owner, owner, clid))
3888                 return false;
3889         lst = list_first_entry(&lo->lo_owner.so_stateids,
3890                                struct nfs4_ol_stateid, st_perstateowner);
3891         return lst->st_file->fi_inode == inode;
3892 }
3893
3894 static struct nfs4_lockowner *
3895 find_lockowner_str(struct inode *inode, clientid_t *clid,
3896                 struct xdr_netobj *owner)
3897 {
3898         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3899         struct nfs4_lockowner *lo;
3900
3901         list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3902                 if (same_lockowner_ino(lo, inode, clid, owner))
3903                         return lo;
3904         }
3905         return NULL;
3906 }
3907
3908 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3909 {
3910         struct inode *inode = open_stp->st_file->fi_inode;
3911         unsigned int inohash = lockowner_ino_hashval(inode,
3912                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3913
3914         list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
3915         list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
3916         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3917 }
3918
3919 /*
3920  * Alloc a lock owner structure.
3921  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3922  * occurred.
3923  *
3924  * strhashval = ownerstr_hashval
3925  */
3926
3927 static struct nfs4_lockowner *
3928 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3929         struct nfs4_lockowner *lo;
3930
3931         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
3932         if (!lo)
3933                 return NULL;
3934         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
3935         lo->lo_owner.so_is_open_owner = 0;
3936         /* It is the openowner seqid that will be incremented in encode in the
3937          * case of new lockowners; so increment the lock seqid manually: */
3938         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
3939         hash_lockowner(lo, strhashval, clp, open_stp);
3940         return lo;
3941 }
3942
3943 static struct nfs4_ol_stateid *
3944 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
3945 {
3946         struct nfs4_ol_stateid *stp;
3947         struct nfs4_client *clp = lo->lo_owner.so_client;
3948
3949         stp = nfs4_alloc_stateid(clp);
3950         if (stp == NULL)
3951                 return NULL;
3952         init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
3953         list_add(&stp->st_perfile, &fp->fi_stateids);
3954         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
3955         stp->st_stateowner = &lo->lo_owner;
3956         get_nfs4_file(fp);
3957         stp->st_file = fp;
3958         stp->st_access_bmap = 0;
3959         stp->st_deny_bmap = open_stp->st_deny_bmap;
3960         stp->st_openstp = open_stp;
3961         return stp;
3962 }
3963
3964 static int
3965 check_lock_length(u64 offset, u64 length)
3966 {
3967         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
3968              LOFF_OVERFLOW(offset, length)));
3969 }
3970
3971 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
3972 {
3973         struct nfs4_file *fp = lock_stp->st_file;
3974         int oflag = nfs4_access_to_omode(access);
3975
3976         if (test_access(access, lock_stp))
3977                 return;
3978         nfs4_file_get_access(fp, oflag);
3979         set_access(access, lock_stp);
3980 }
3981
3982 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)
3983 {
3984         struct nfs4_file *fi = ost->st_file;
3985         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
3986         struct nfs4_client *cl = oo->oo_owner.so_client;
3987         struct nfs4_lockowner *lo;
3988         unsigned int strhashval;
3989
3990         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
3991         if (lo) {
3992                 if (!cstate->minorversion)
3993                         return nfserr_bad_seqid;
3994                 /* XXX: a lockowner always has exactly one stateid: */
3995                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
3996                                 struct nfs4_ol_stateid, st_perstateowner);
3997                 return nfs_ok;
3998         }
3999         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4000                         &lock->v.new.owner);
4001         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4002         if (lo == NULL)
4003                 return nfserr_jukebox;
4004         *lst = alloc_init_lock_stateid(lo, fi, ost);
4005         if (*lst == NULL) {
4006                 release_lockowner(lo);
4007                 return nfserr_jukebox;
4008         }
4009         *new = true;
4010         return nfs_ok;
4011 }
4012
4013 /*
4014  *  LOCK operation
4015  */
4016 __be32
4017 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4018            struct nfsd4_lock *lock)
4019 {
4020         struct nfs4_openowner *open_sop = NULL;
4021         struct nfs4_lockowner *lock_sop = NULL;
4022         struct nfs4_ol_stateid *lock_stp;
4023         struct file *filp = NULL;
4024         struct file_lock file_lock;
4025         struct file_lock conflock;
4026         __be32 status = 0;
4027         bool new_state = false;
4028         int lkflg;
4029         int err;
4030
4031         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4032                 (long long) lock->lk_offset,
4033                 (long long) lock->lk_length);
4034
4035         if (check_lock_length(lock->lk_offset, lock->lk_length))
4036                  return nfserr_inval;
4037
4038         if ((status = fh_verify(rqstp, &cstate->current_fh,
4039                                 S_IFREG, NFSD_MAY_LOCK))) {
4040                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4041                 return status;
4042         }
4043
4044         nfs4_lock_state();
4045
4046         if (lock->lk_is_new) {
4047                 /*
4048                  * Client indicates that this is a new lockowner.
4049                  * Use open owner and open stateid to create lock owner and
4050                  * lock stateid.
4051                  */
4052                 struct nfs4_ol_stateid *open_stp = NULL;
4053
4054                 if (nfsd4_has_session(cstate))
4055                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4056                         memcpy(&lock->v.new.clientid,
4057                                 &cstate->session->se_client->cl_clientid,
4058                                 sizeof(clientid_t));
4059
4060                 status = nfserr_stale_clientid;
4061                 if (STALE_CLIENTID(&lock->lk_new_clientid))
4062                         goto out;
4063
4064                 /* validate and update open stateid and open seqid */
4065                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4066                                         lock->lk_new_open_seqid,
4067                                         &lock->lk_new_open_stateid,
4068                                         &open_stp);
4069                 if (status)
4070                         goto out;
4071                 open_sop = openowner(open_stp->st_stateowner);
4072                 status = nfserr_bad_stateid;
4073                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4074                                                 &lock->v.new.clientid))
4075                         goto out;
4076                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4077                                                         &lock_stp, &new_state);
4078                 if (status)
4079                         goto out;
4080         } else {
4081                 /* lock (lock owner + lock stateid) already exists */
4082                 status = nfs4_preprocess_seqid_op(cstate,
4083                                        lock->lk_old_lock_seqid,
4084                                        &lock->lk_old_lock_stateid,
4085                                        NFS4_LOCK_STID, &lock_stp);
4086                 if (status)
4087                         goto out;
4088         }
4089         lock_sop = lockowner(lock_stp->st_stateowner);
4090
4091         lkflg = setlkflg(lock->lk_type);
4092         status = nfs4_check_openmode(lock_stp, lkflg);
4093         if (status)
4094                 goto out;
4095
4096         status = nfserr_grace;
4097         if (locks_in_grace() && !lock->lk_reclaim)
4098                 goto out;
4099         status = nfserr_no_grace;
4100         if (!locks_in_grace() && lock->lk_reclaim)
4101                 goto out;
4102
4103         locks_init_lock(&file_lock);
4104         switch (lock->lk_type) {
4105                 case NFS4_READ_LT:
4106                 case NFS4_READW_LT:
4107                         filp = find_readable_file(lock_stp->st_file);
4108                         if (filp)
4109                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4110                         file_lock.fl_type = F_RDLCK;
4111                         break;
4112                 case NFS4_WRITE_LT:
4113                 case NFS4_WRITEW_LT:
4114                         filp = find_writeable_file(lock_stp->st_file);
4115                         if (filp)
4116                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4117                         file_lock.fl_type = F_WRLCK;
4118                         break;
4119                 default:
4120                         status = nfserr_inval;
4121                 goto out;
4122         }
4123         if (!filp) {
4124                 status = nfserr_openmode;
4125                 goto out;
4126         }
4127         file_lock.fl_owner = (fl_owner_t)lock_sop;
4128         file_lock.fl_pid = current->tgid;
4129         file_lock.fl_file = filp;
4130         file_lock.fl_flags = FL_POSIX;
4131         file_lock.fl_lmops = &nfsd_posix_mng_ops;
4132
4133         file_lock.fl_start = lock->lk_offset;
4134         file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4135         nfs4_transform_lock_offset(&file_lock);
4136
4137         /*
4138         * Try to lock the file in the VFS.
4139         * Note: locks.c uses the BKL to protect the inode's lock list.
4140         */
4141
4142         err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock);
4143         switch (-err) {
4144         case 0: /* success! */
4145                 update_stateid(&lock_stp->st_stid.sc_stateid);
4146                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4147                                 sizeof(stateid_t));
4148                 status = 0;
4149                 break;
4150         case (EAGAIN):          /* conflock holds conflicting lock */
4151                 status = nfserr_denied;
4152                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4153                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
4154                 break;
4155         case (EDEADLK):
4156                 status = nfserr_deadlock;
4157                 break;
4158         default:
4159                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4160                 status = nfserrno(err);
4161                 break;
4162         }
4163 out:
4164         if (status && new_state)
4165                 release_lockowner(lock_sop);
4166         if (!cstate->replay_owner)
4167                 nfs4_unlock_state();
4168         return status;
4169 }
4170
4171 /*
4172  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4173  * so we do a temporary open here just to get an open file to pass to
4174  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4175  * inode operation.)
4176  */
4177 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4178 {
4179         struct file *file;
4180         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4181         if (!err) {
4182                 err = nfserrno(vfs_test_lock(file, lock));
4183                 nfsd_close(file);
4184         }
4185         return err;
4186 }
4187
4188 /*
4189  * LOCKT operation
4190  */
4191 __be32
4192 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4193             struct nfsd4_lockt *lockt)
4194 {
4195         struct inode *inode;
4196         struct file_lock file_lock;
4197         struct nfs4_lockowner *lo;
4198         __be32 status;
4199
4200         if (locks_in_grace())
4201                 return nfserr_grace;
4202
4203         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4204                  return nfserr_inval;
4205
4206         nfs4_lock_state();
4207
4208         status = nfserr_stale_clientid;
4209         if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
4210                 goto out;
4211
4212         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4213                 goto out;
4214
4215         inode = cstate->current_fh.fh_dentry->d_inode;
4216         locks_init_lock(&file_lock);
4217         switch (lockt->lt_type) {
4218                 case NFS4_READ_LT:
4219                 case NFS4_READW_LT:
4220                         file_lock.fl_type = F_RDLCK;
4221                 break;
4222                 case NFS4_WRITE_LT:
4223                 case NFS4_WRITEW_LT:
4224                         file_lock.fl_type = F_WRLCK;
4225                 break;
4226                 default:
4227                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4228                         status = nfserr_inval;
4229                 goto out;
4230         }
4231
4232         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4233         if (lo)
4234                 file_lock.fl_owner = (fl_owner_t)lo;
4235         file_lock.fl_pid = current->tgid;
4236         file_lock.fl_flags = FL_POSIX;
4237
4238         file_lock.fl_start = lockt->lt_offset;
4239         file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4240
4241         nfs4_transform_lock_offset(&file_lock);
4242
4243         status = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
4244         if (status)
4245                 goto out;
4246
4247         if (file_lock.fl_type != F_UNLCK) {
4248                 status = nfserr_denied;
4249                 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
4250         }
4251 out:
4252         nfs4_unlock_state();
4253         return status;
4254 }
4255
4256 __be32
4257 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4258             struct nfsd4_locku *locku)
4259 {
4260         struct nfs4_ol_stateid *stp;
4261         struct file *filp = NULL;
4262         struct file_lock file_lock;
4263         __be32 status;
4264         int err;
4265
4266         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4267                 (long long) locku->lu_offset,
4268                 (long long) locku->lu_length);
4269
4270         if (check_lock_length(locku->lu_offset, locku->lu_length))
4271                  return nfserr_inval;
4272
4273         nfs4_lock_state();
4274
4275         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4276                                         &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4277         if (status)
4278                 goto out;
4279         filp = find_any_file(stp->st_file);
4280         if (!filp) {
4281                 status = nfserr_lock_range;
4282                 goto out;
4283         }
4284         BUG_ON(!filp);
4285         locks_init_lock(&file_lock);
4286         file_lock.fl_type = F_UNLCK;
4287         file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4288         file_lock.fl_pid = current->tgid;
4289         file_lock.fl_file = filp;
4290         file_lock.fl_flags = FL_POSIX;
4291         file_lock.fl_lmops = &nfsd_posix_mng_ops;
4292         file_lock.fl_start = locku->lu_offset;
4293
4294         file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
4295         nfs4_transform_lock_offset(&file_lock);
4296
4297         /*
4298         *  Try to unlock the file in the VFS.
4299         */
4300         err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
4301         if (err) {
4302                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4303                 goto out_nfserr;
4304         }
4305         /*
4306         * OK, unlock succeeded; the only thing left to do is update the stateid.
4307         */
4308         update_stateid(&stp->st_stid.sc_stateid);
4309         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4310
4311 out:
4312         if (!cstate->replay_owner)
4313                 nfs4_unlock_state();
4314         return status;
4315
4316 out_nfserr:
4317         status = nfserrno(err);
4318         goto out;
4319 }
4320
4321 /*
4322  * returns
4323  *      1: locks held by lockowner
4324  *      0: no locks held by lockowner
4325  */
4326 static int
4327 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4328 {
4329         struct file_lock **flpp;
4330         struct inode *inode = filp->fi_inode;
4331         int status = 0;
4332
4333         lock_flocks();
4334         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4335                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4336                         status = 1;
4337                         goto out;
4338                 }
4339         }
4340 out:
4341         unlock_flocks();
4342         return status;
4343 }
4344
4345 __be32
4346 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4347                         struct nfsd4_compound_state *cstate,
4348                         struct nfsd4_release_lockowner *rlockowner)
4349 {
4350         clientid_t *clid = &rlockowner->rl_clientid;
4351         struct nfs4_stateowner *sop;
4352         struct nfs4_lockowner *lo;
4353         struct nfs4_ol_stateid *stp;
4354         struct xdr_netobj *owner = &rlockowner->rl_owner;
4355         struct list_head matches;
4356         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4357         __be32 status;
4358
4359         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4360                 clid->cl_boot, clid->cl_id);
4361
4362         /* XXX check for lease expiration */
4363
4364         status = nfserr_stale_clientid;
4365         if (STALE_CLIENTID(clid))
4366                 return status;
4367
4368         nfs4_lock_state();
4369
4370         status = nfserr_locks_held;
4371         INIT_LIST_HEAD(&matches);
4372
4373         list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
4374                 if (sop->so_is_open_owner)
4375                         continue;
4376                 if (!same_owner_str(sop, owner, clid))
4377                         continue;
4378                 list_for_each_entry(stp, &sop->so_stateids,
4379                                 st_perstateowner) {
4380                         lo = lockowner(sop);
4381                         if (check_for_locks(stp->st_file, lo))
4382                                 goto out;
4383                         list_add(&lo->lo_list, &matches);
4384                 }
4385         }
4386         /* Clients probably won't expect us to return with some (but not all)
4387          * of the lockowner state released; so don't release any until all
4388          * have been checked. */
4389         status = nfs_ok;
4390         while (!list_empty(&matches)) {
4391                 lo = list_entry(matches.next, struct nfs4_lockowner,
4392                                                                 lo_list);
4393                 /* unhash_stateowner deletes so_perclient only
4394                  * for openowners. */
4395                 list_del(&lo->lo_list);
4396                 release_lockowner(lo);
4397         }
4398 out:
4399         nfs4_unlock_state();
4400         return status;
4401 }
4402
4403 static inline struct nfs4_client_reclaim *
4404 alloc_reclaim(void)
4405 {
4406         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4407 }
4408
4409 int
4410 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4411 {
4412         unsigned int strhashval = clientstr_hashval(name);
4413         struct nfs4_client *clp;
4414
4415         clp = find_confirmed_client_by_str(name, strhashval);
4416         if (!clp)
4417                 return 0;
4418         return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
4419 }
4420
4421 /*
4422  * failure => all reset bets are off, nfserr_no_grace...
4423  */
4424 int
4425 nfs4_client_to_reclaim(const char *name)
4426 {
4427         unsigned int strhashval;
4428         struct nfs4_client_reclaim *crp = NULL;
4429
4430         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4431         crp = alloc_reclaim();
4432         if (!crp)
4433                 return 0;
4434         strhashval = clientstr_hashval(name);
4435         INIT_LIST_HEAD(&crp->cr_strhash);
4436         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4437         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4438         reclaim_str_hashtbl_size++;
4439         return 1;
4440 }
4441
4442 void
4443 nfs4_release_reclaim(void)
4444 {
4445         struct nfs4_client_reclaim *crp = NULL;
4446         int i;
4447
4448         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4449                 while (!list_empty(&reclaim_str_hashtbl[i])) {
4450                         crp = list_entry(reclaim_str_hashtbl[i].next,
4451                                         struct nfs4_client_reclaim, cr_strhash);
4452                         list_del(&crp->cr_strhash);
4453                         kfree(crp);
4454                         reclaim_str_hashtbl_size--;
4455                 }
4456         }
4457         BUG_ON(reclaim_str_hashtbl_size);
4458 }
4459
4460 /*
4461  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4462 struct nfs4_client_reclaim *
4463 nfsd4_find_reclaim_client(struct nfs4_client *clp)
4464 {
4465         unsigned int strhashval;
4466         struct nfs4_client_reclaim *crp = NULL;
4467
4468         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4469                             clp->cl_name.len, clp->cl_name.data,
4470                             clp->cl_recdir);
4471
4472         /* find clp->cl_name in reclaim_str_hashtbl */
4473         strhashval = clientstr_hashval(clp->cl_recdir);
4474         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4475                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4476                         return crp;
4477                 }
4478         }
4479         return NULL;
4480 }
4481
4482 /*
4483 * Called from OPEN. Look for clientid in reclaim list.
4484 */
4485 __be32
4486 nfs4_check_open_reclaim(clientid_t *clid)
4487 {
4488         struct nfs4_client *clp;
4489
4490         /* find clientid in conf_id_hashtbl */
4491         clp = find_confirmed_client(clid);
4492         if (clp == NULL)
4493                 return nfserr_reclaim_bad;
4494
4495         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4496 }
4497
4498 #ifdef CONFIG_NFSD_FAULT_INJECTION
4499
4500 void nfsd_forget_clients(u64 num)
4501 {
4502         struct nfs4_client *clp, *next;
4503         int count = 0;
4504
4505         nfs4_lock_state();
4506         list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
4507                 nfsd4_client_record_remove(clp);
4508                 expire_client(clp);
4509                 if (++count == num)
4510                         break;
4511         }
4512         nfs4_unlock_state();
4513
4514         printk(KERN_INFO "NFSD: Forgot %d clients", count);
4515 }
4516
4517 static void release_lockowner_sop(struct nfs4_stateowner *sop)
4518 {
4519         release_lockowner(lockowner(sop));
4520 }
4521
4522 static void release_openowner_sop(struct nfs4_stateowner *sop)
4523 {
4524         release_openowner(openowner(sop));
4525 }
4526
4527 static int nfsd_release_n_owners(u64 num, bool is_open_owner,
4528                                 void (*release_sop)(struct nfs4_stateowner *))
4529 {
4530         int i, count = 0;
4531         struct nfs4_stateowner *sop, *next;
4532
4533         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4534                 list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
4535                         if (sop->so_is_open_owner != is_open_owner)
4536                                 continue;
4537                         release_sop(sop);
4538                         if (++count == num)
4539                                 return count;
4540                 }
4541         }
4542         return count;
4543 }
4544
4545 void nfsd_forget_locks(u64 num)
4546 {
4547         int count;
4548
4549         nfs4_lock_state();
4550         count = nfsd_release_n_owners(num, false, release_lockowner_sop);
4551         nfs4_unlock_state();
4552
4553         printk(KERN_INFO "NFSD: Forgot %d locks", count);
4554 }
4555
4556 void nfsd_forget_openowners(u64 num)
4557 {
4558         int count;
4559
4560         nfs4_lock_state();
4561         count = nfsd_release_n_owners(num, true, release_openowner_sop);
4562         nfs4_unlock_state();
4563
4564         printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4565 }
4566
4567 int nfsd_process_n_delegations(u64 num, void (*deleg_func)(struct nfs4_delegation *))
4568 {
4569         int i, count = 0;
4570         struct nfs4_file *fp, *fnext;
4571         struct nfs4_delegation *dp, *dnext;
4572
4573         for (i = 0; i < FILE_HASH_SIZE; i++) {
4574                 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4575                         list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
4576                                 deleg_func(dp);
4577                                 if (++count == num)
4578                                         return count;
4579                         }
4580                 }
4581         }
4582
4583         return count;
4584 }
4585
4586 void nfsd_forget_delegations(u64 num)
4587 {
4588         unsigned int count;
4589
4590         nfs4_lock_state();
4591         count = nfsd_process_n_delegations(num, unhash_delegation);
4592         nfs4_unlock_state();
4593
4594         printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4595 }
4596
4597 void nfsd_recall_delegations(u64 num)
4598 {
4599         unsigned int count;
4600
4601         nfs4_lock_state();
4602         spin_lock(&recall_lock);
4603         count = nfsd_process_n_delegations(num, nfsd_break_one_deleg);
4604         spin_unlock(&recall_lock);
4605         nfs4_unlock_state();
4606
4607         printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4608 }
4609
4610 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4611
4612 /* initialization to perform at module load time: */
4613
4614 void
4615 nfs4_state_init(void)
4616 {
4617         int i;
4618
4619         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4620                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4621                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4622                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4623                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4624                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4625         }
4626         for (i = 0; i < SESSION_HASH_SIZE; i++)
4627                 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4628         for (i = 0; i < FILE_HASH_SIZE; i++) {
4629                 INIT_LIST_HEAD(&file_hashtbl[i]);
4630         }
4631         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4632                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4633         }
4634         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4635                 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
4636         INIT_LIST_HEAD(&close_lru);
4637         INIT_LIST_HEAD(&client_lru);
4638         INIT_LIST_HEAD(&del_recall_lru);
4639         reclaim_str_hashtbl_size = 0;
4640 }
4641
4642 /*
4643  * Since the lifetime of a delegation isn't limited to that of an open, a
4644  * client may quite reasonably hang on to a delegation as long as it has
4645  * the inode cached.  This becomes an obvious problem the first time a
4646  * client's inode cache approaches the size of the server's total memory.
4647  *
4648  * For now we avoid this problem by imposing a hard limit on the number
4649  * of delegations, which varies according to the server's memory size.
4650  */
4651 static void
4652 set_max_delegations(void)
4653 {
4654         /*
4655          * Allow at most 4 delegations per megabyte of RAM.  Quick
4656          * estimates suggest that in the worst case (where every delegation
4657          * is for a different inode), a delegation could take about 1.5K,
4658          * giving a worst case usage of about 6% of memory.
4659          */
4660         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4661 }
4662
4663 /* initialization to perform when the nfsd service is started: */
4664
4665 int
4666 nfs4_state_start(void)
4667 {
4668         int ret;
4669
4670         /*
4671          * FIXME: For now, we hang most of the pernet global stuff off of
4672          * init_net until nfsd is fully containerized. Eventually, we'll
4673          * need to pass a net pointer into this function, take a reference
4674          * to that instead and then do most of the rest of this on a per-net
4675          * basis.
4676          */
4677         get_net(&init_net);
4678         nfsd4_client_tracking_init(&init_net);
4679         boot_time = get_seconds();
4680         locks_start_grace(&nfsd4_manager);
4681         grace_ended = false;
4682         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4683                nfsd4_grace);
4684         ret = set_callback_cred();
4685         if (ret) {
4686                 ret = -ENOMEM;
4687                 goto out_recovery;
4688         }
4689         laundry_wq = create_singlethread_workqueue("nfsd4");
4690         if (laundry_wq == NULL) {
4691                 ret = -ENOMEM;
4692                 goto out_recovery;
4693         }
4694         ret = nfsd4_create_callback_queue();
4695         if (ret)
4696                 goto out_free_laundry;
4697         queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4698         set_max_delegations();
4699         return 0;
4700 out_free_laundry:
4701         destroy_workqueue(laundry_wq);
4702 out_recovery:
4703         nfsd4_client_tracking_exit(&init_net);
4704         put_net(&init_net);
4705         return ret;
4706 }
4707
4708 static void
4709 __nfs4_state_shutdown(void)
4710 {
4711         int i;
4712         struct nfs4_client *clp = NULL;
4713         struct nfs4_delegation *dp = NULL;
4714         struct list_head *pos, *next, reaplist;
4715
4716         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4717                 while (!list_empty(&conf_id_hashtbl[i])) {
4718                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4719                         expire_client(clp);
4720                 }
4721                 while (!list_empty(&unconf_str_hashtbl[i])) {
4722                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4723                         expire_client(clp);
4724                 }
4725         }
4726         INIT_LIST_HEAD(&reaplist);
4727         spin_lock(&recall_lock);
4728         list_for_each_safe(pos, next, &del_recall_lru) {
4729                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4730                 list_move(&dp->dl_recall_lru, &reaplist);
4731         }
4732         spin_unlock(&recall_lock);
4733         list_for_each_safe(pos, next, &reaplist) {
4734                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4735                 unhash_delegation(dp);
4736         }
4737
4738         nfsd4_client_tracking_exit(&init_net);
4739         put_net(&init_net);
4740 }
4741
4742 void
4743 nfs4_state_shutdown(void)
4744 {
4745         cancel_delayed_work_sync(&laundromat_work);
4746         destroy_workqueue(laundry_wq);
4747         locks_end_grace(&nfsd4_manager);
4748         nfs4_lock_state();
4749         __nfs4_state_shutdown();
4750         nfs4_unlock_state();
4751         nfsd4_destroy_callback_queue();
4752 }
4753
4754 static void
4755 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4756 {
4757         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4758                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4759 }
4760
4761 static void
4762 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4763 {
4764         if (cstate->minorversion) {
4765                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4766                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4767         }
4768 }
4769
4770 void
4771 clear_current_stateid(struct nfsd4_compound_state *cstate)
4772 {
4773         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4774 }
4775
4776 /*
4777  * functions to set current state id
4778  */
4779 void
4780 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4781 {
4782         put_stateid(cstate, &odp->od_stateid);
4783 }
4784
4785 void
4786 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4787 {
4788         put_stateid(cstate, &open->op_stateid);
4789 }
4790
4791 void
4792 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4793 {
4794         put_stateid(cstate, &close->cl_stateid);
4795 }
4796
4797 void
4798 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4799 {
4800         put_stateid(cstate, &lock->lk_resp_stateid);
4801 }
4802
4803 /*
4804  * functions to consume current state id
4805  */
4806
4807 void
4808 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4809 {
4810         get_stateid(cstate, &odp->od_stateid);
4811 }
4812
4813 void
4814 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4815 {
4816         get_stateid(cstate, &drp->dr_stateid);
4817 }
4818
4819 void
4820 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4821 {
4822         get_stateid(cstate, &fsp->fr_stateid);
4823 }
4824
4825 void
4826 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4827 {
4828         get_stateid(cstate, &setattr->sa_stateid);
4829 }
4830
4831 void
4832 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4833 {
4834         get_stateid(cstate, &close->cl_stateid);
4835 }
4836
4837 void
4838 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
4839 {
4840         get_stateid(cstate, &locku->lu_stateid);
4841 }
4842
4843 void
4844 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
4845 {
4846         get_stateid(cstate, &read->rd_stateid);
4847 }
4848
4849 void
4850 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
4851 {
4852         get_stateid(cstate, &write->wr_stateid);
4853 }