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         BUG_ON(!spin_is_locked(&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                 dprintk("%s: client (clientid %08x/%08x) already expired\n",
1026                         __func__,
1027                         clp->cl_clientid.cl_boot,
1028                         clp->cl_clientid.cl_id);
1029                 return;
1030         }
1031
1032         dprintk("renewing client (clientid %08x/%08x)\n",
1033                         clp->cl_clientid.cl_boot,
1034                         clp->cl_clientid.cl_id);
1035         list_move_tail(&clp->cl_lru, &client_lru);
1036         clp->cl_time = get_seconds();
1037 }
1038
1039 static inline void
1040 renew_client(struct nfs4_client *clp)
1041 {
1042         spin_lock(&client_lock);
1043         renew_client_locked(clp);
1044         spin_unlock(&client_lock);
1045 }
1046
1047 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1048 static int
1049 STALE_CLIENTID(clientid_t *clid)
1050 {
1051         if (clid->cl_boot == boot_time)
1052                 return 0;
1053         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1054                 clid->cl_boot, clid->cl_id, boot_time);
1055         return 1;
1056 }
1057
1058 /*
1059  * XXX Should we use a slab cache ?
1060  * This type of memory management is somewhat inefficient, but we use it
1061  * anyway since SETCLIENTID is not a common operation.
1062  */
1063 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1064 {
1065         struct nfs4_client *clp;
1066
1067         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1068         if (clp == NULL)
1069                 return NULL;
1070         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1071         if (clp->cl_name.data == NULL) {
1072                 kfree(clp);
1073                 return NULL;
1074         }
1075         clp->cl_name.len = name.len;
1076         return clp;
1077 }
1078
1079 static inline void
1080 free_client(struct nfs4_client *clp)
1081 {
1082         BUG_ON(!spin_is_locked(&client_lock));
1083         while (!list_empty(&clp->cl_sessions)) {
1084                 struct nfsd4_session *ses;
1085                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1086                                 se_perclnt);
1087                 list_del(&ses->se_perclnt);
1088                 nfsd4_put_session_locked(ses);
1089         }
1090         free_svc_cred(&clp->cl_cred);
1091         kfree(clp->cl_name.data);
1092         kfree(clp);
1093 }
1094
1095 void
1096 release_session_client(struct nfsd4_session *session)
1097 {
1098         struct nfs4_client *clp = session->se_client;
1099
1100         if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1101                 return;
1102         if (is_client_expired(clp)) {
1103                 free_client(clp);
1104                 session->se_client = NULL;
1105         } else
1106                 renew_client_locked(clp);
1107         spin_unlock(&client_lock);
1108 }
1109
1110 /* must be called under the client_lock */
1111 static inline void
1112 unhash_client_locked(struct nfs4_client *clp)
1113 {
1114         struct nfsd4_session *ses;
1115
1116         mark_client_expired(clp);
1117         list_del(&clp->cl_lru);
1118         spin_lock(&clp->cl_lock);
1119         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1120                 list_del_init(&ses->se_hash);
1121         spin_unlock(&clp->cl_lock);
1122 }
1123
1124 static void
1125 expire_client(struct nfs4_client *clp)
1126 {
1127         struct nfs4_openowner *oo;
1128         struct nfs4_delegation *dp;
1129         struct list_head reaplist;
1130
1131         INIT_LIST_HEAD(&reaplist);
1132         spin_lock(&recall_lock);
1133         while (!list_empty(&clp->cl_delegations)) {
1134                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1135                 list_del_init(&dp->dl_perclnt);
1136                 list_move(&dp->dl_recall_lru, &reaplist);
1137         }
1138         spin_unlock(&recall_lock);
1139         while (!list_empty(&reaplist)) {
1140                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1141                 unhash_delegation(dp);
1142         }
1143         while (!list_empty(&clp->cl_openowners)) {
1144                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1145                 release_openowner(oo);
1146         }
1147         nfsd4_shutdown_callback(clp);
1148         if (clp->cl_cb_conn.cb_xprt)
1149                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1150         list_del(&clp->cl_idhash);
1151         list_del(&clp->cl_strhash);
1152         spin_lock(&client_lock);
1153         unhash_client_locked(clp);
1154         if (atomic_read(&clp->cl_refcount) == 0)
1155                 free_client(clp);
1156         spin_unlock(&client_lock);
1157 }
1158
1159 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1160 {
1161         memcpy(target->cl_verifier.data, source->data,
1162                         sizeof(target->cl_verifier.data));
1163 }
1164
1165 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1166 {
1167         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1168         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1169 }
1170
1171 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1172 {
1173         if (source->cr_principal) {
1174                 target->cr_principal =
1175                                 kstrdup(source->cr_principal, GFP_KERNEL);
1176                 if (target->cr_principal == NULL)
1177                         return -ENOMEM;
1178         } else
1179                 target->cr_principal = NULL;
1180         target->cr_flavor = source->cr_flavor;
1181         target->cr_uid = source->cr_uid;
1182         target->cr_gid = source->cr_gid;
1183         target->cr_group_info = source->cr_group_info;
1184         get_group_info(target->cr_group_info);
1185         return 0;
1186 }
1187
1188 static int same_name(const char *n1, const char *n2)
1189 {
1190         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1191 }
1192
1193 static int
1194 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1195 {
1196         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1197 }
1198
1199 static int
1200 same_clid(clientid_t *cl1, clientid_t *cl2)
1201 {
1202         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1203 }
1204
1205 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1206 {
1207         int i;
1208
1209         if (g1->ngroups != g2->ngroups)
1210                 return false;
1211         for (i=0; i<g1->ngroups; i++)
1212                 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1213                         return false;
1214         return true;
1215 }
1216
1217 static int
1218 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1219 {
1220         if ((cr1->cr_flavor != cr2->cr_flavor)
1221                 || (cr1->cr_uid != cr2->cr_uid)
1222                 || (cr1->cr_gid != cr2->cr_gid)
1223                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1224                 return false;
1225         if (cr1->cr_principal == cr2->cr_principal)
1226                 return true;
1227         if (!cr1->cr_principal || !cr2->cr_principal)
1228                 return false;
1229         return 0 == strcmp(cr1->cr_principal, cr1->cr_principal);
1230 }
1231
1232 static void gen_clid(struct nfs4_client *clp)
1233 {
1234         static u32 current_clientid = 1;
1235
1236         clp->cl_clientid.cl_boot = boot_time;
1237         clp->cl_clientid.cl_id = current_clientid++;
1238 }
1239
1240 static void gen_confirm(struct nfs4_client *clp)
1241 {
1242         __be32 verf[2];
1243         static u32 i;
1244
1245         verf[0] = (__be32)get_seconds();
1246         verf[1] = (__be32)i++;
1247         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1248 }
1249
1250 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1251 {
1252         return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1253 }
1254
1255 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1256 {
1257         struct nfs4_stid *s;
1258
1259         s = find_stateid(cl, t);
1260         if (!s)
1261                 return NULL;
1262         if (typemask & s->sc_type)
1263                 return s;
1264         return NULL;
1265 }
1266
1267 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1268                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1269 {
1270         struct nfs4_client *clp;
1271         struct sockaddr *sa = svc_addr(rqstp);
1272         int ret;
1273
1274         clp = alloc_client(name);
1275         if (clp == NULL)
1276                 return NULL;
1277
1278         INIT_LIST_HEAD(&clp->cl_sessions);
1279         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1280         if (ret) {
1281                 spin_lock(&client_lock);
1282                 free_client(clp);
1283                 spin_unlock(&client_lock);
1284                 return NULL;
1285         }
1286         idr_init(&clp->cl_stateids);
1287         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1288         atomic_set(&clp->cl_refcount, 0);
1289         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1290         INIT_LIST_HEAD(&clp->cl_idhash);
1291         INIT_LIST_HEAD(&clp->cl_strhash);
1292         INIT_LIST_HEAD(&clp->cl_openowners);
1293         INIT_LIST_HEAD(&clp->cl_delegations);
1294         INIT_LIST_HEAD(&clp->cl_lru);
1295         INIT_LIST_HEAD(&clp->cl_callbacks);
1296         spin_lock_init(&clp->cl_lock);
1297         INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1298         clp->cl_time = get_seconds();
1299         clear_bit(0, &clp->cl_cb_slot_busy);
1300         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1301         copy_verf(clp, verf);
1302         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1303         gen_confirm(clp);
1304         clp->cl_cb_session = NULL;
1305         return clp;
1306 }
1307
1308 static void
1309 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1310 {
1311         unsigned int idhashval;
1312
1313         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1314         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1315         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1316         renew_client(clp);
1317 }
1318
1319 static void
1320 move_to_confirmed(struct nfs4_client *clp)
1321 {
1322         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1323         unsigned int strhashval;
1324
1325         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1326         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1327         strhashval = clientstr_hashval(clp->cl_recdir);
1328         list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1329         renew_client(clp);
1330 }
1331
1332 static struct nfs4_client *
1333 find_confirmed_client(clientid_t *clid)
1334 {
1335         struct nfs4_client *clp;
1336         unsigned int idhashval = clientid_hashval(clid->cl_id);
1337
1338         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1339                 if (same_clid(&clp->cl_clientid, clid)) {
1340                         renew_client(clp);
1341                         return clp;
1342                 }
1343         }
1344         return NULL;
1345 }
1346
1347 static struct nfs4_client *
1348 find_unconfirmed_client(clientid_t *clid)
1349 {
1350         struct nfs4_client *clp;
1351         unsigned int idhashval = clientid_hashval(clid->cl_id);
1352
1353         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1354                 if (same_clid(&clp->cl_clientid, clid))
1355                         return clp;
1356         }
1357         return NULL;
1358 }
1359
1360 static bool clp_used_exchangeid(struct nfs4_client *clp)
1361 {
1362         return clp->cl_exchange_flags != 0;
1363 }
1364
1365 static struct nfs4_client *
1366 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1367 {
1368         struct nfs4_client *clp;
1369
1370         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1371                 if (same_name(clp->cl_recdir, dname))
1372                         return clp;
1373         }
1374         return NULL;
1375 }
1376
1377 static struct nfs4_client *
1378 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1379 {
1380         struct nfs4_client *clp;
1381
1382         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1383                 if (same_name(clp->cl_recdir, dname))
1384                         return clp;
1385         }
1386         return NULL;
1387 }
1388
1389 static void
1390 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1391 {
1392         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1393         struct sockaddr *sa = svc_addr(rqstp);
1394         u32 scopeid = rpc_get_scope_id(sa);
1395         unsigned short expected_family;
1396
1397         /* Currently, we only support tcp and tcp6 for the callback channel */
1398         if (se->se_callback_netid_len == 3 &&
1399             !memcmp(se->se_callback_netid_val, "tcp", 3))
1400                 expected_family = AF_INET;
1401         else if (se->se_callback_netid_len == 4 &&
1402                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1403                 expected_family = AF_INET6;
1404         else
1405                 goto out_err;
1406
1407         conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val,
1408                                             se->se_callback_addr_len,
1409                                             (struct sockaddr *)&conn->cb_addr,
1410                                             sizeof(conn->cb_addr));
1411
1412         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1413                 goto out_err;
1414
1415         if (conn->cb_addr.ss_family == AF_INET6)
1416                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1417
1418         conn->cb_prog = se->se_callback_prog;
1419         conn->cb_ident = se->se_callback_ident;
1420         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1421         return;
1422 out_err:
1423         conn->cb_addr.ss_family = AF_UNSPEC;
1424         conn->cb_addrlen = 0;
1425         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1426                 "will not receive delegations\n",
1427                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1428
1429         return;
1430 }
1431
1432 /*
1433  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1434  */
1435 void
1436 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1437 {
1438         struct nfsd4_slot *slot = resp->cstate.slot;
1439         unsigned int base;
1440
1441         dprintk("--> %s slot %p\n", __func__, slot);
1442
1443         slot->sl_opcnt = resp->opcnt;
1444         slot->sl_status = resp->cstate.status;
1445
1446         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1447         if (nfsd4_not_cached(resp)) {
1448                 slot->sl_datalen = 0;
1449                 return;
1450         }
1451         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1452         base = (char *)resp->cstate.datap -
1453                                         (char *)resp->xbuf->head[0].iov_base;
1454         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1455                                     slot->sl_datalen))
1456                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1457         return;
1458 }
1459
1460 /*
1461  * Encode the replay sequence operation from the slot values.
1462  * If cachethis is FALSE encode the uncached rep error on the next
1463  * operation which sets resp->p and increments resp->opcnt for
1464  * nfs4svc_encode_compoundres.
1465  *
1466  */
1467 static __be32
1468 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1469                           struct nfsd4_compoundres *resp)
1470 {
1471         struct nfsd4_op *op;
1472         struct nfsd4_slot *slot = resp->cstate.slot;
1473
1474         /* Encode the replayed sequence operation */
1475         op = &args->ops[resp->opcnt - 1];
1476         nfsd4_encode_operation(resp, op);
1477
1478         /* Return nfserr_retry_uncached_rep in next operation. */
1479         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1480                 op = &args->ops[resp->opcnt++];
1481                 op->status = nfserr_retry_uncached_rep;
1482                 nfsd4_encode_operation(resp, op);
1483         }
1484         return op->status;
1485 }
1486
1487 /*
1488  * The sequence operation is not cached because we can use the slot and
1489  * session values.
1490  */
1491 __be32
1492 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1493                          struct nfsd4_sequence *seq)
1494 {
1495         struct nfsd4_slot *slot = resp->cstate.slot;
1496         __be32 status;
1497
1498         dprintk("--> %s slot %p\n", __func__, slot);
1499
1500         /* Either returns 0 or nfserr_retry_uncached */
1501         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1502         if (status == nfserr_retry_uncached_rep)
1503                 return status;
1504
1505         /* The sequence operation has been encoded, cstate->datap set. */
1506         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1507
1508         resp->opcnt = slot->sl_opcnt;
1509         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1510         status = slot->sl_status;
1511
1512         return status;
1513 }
1514
1515 /*
1516  * Set the exchange_id flags returned by the server.
1517  */
1518 static void
1519 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1520 {
1521         /* pNFS is not supported */
1522         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1523
1524         /* Referrals are supported, Migration is not. */
1525         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1526
1527         /* set the wire flags to return to client. */
1528         clid->flags = new->cl_exchange_flags;
1529 }
1530
1531 static bool client_has_state(struct nfs4_client *clp)
1532 {
1533         /*
1534          * Note clp->cl_openowners check isn't quite right: there's no
1535          * need to count owners without stateid's.
1536          *
1537          * Also note we should probably be using this in 4.0 case too.
1538          */
1539         return list_empty(&clp->cl_openowners)
1540                 && list_empty(&clp->cl_delegations)
1541                 && list_empty(&clp->cl_sessions);
1542 }
1543
1544 __be32
1545 nfsd4_exchange_id(struct svc_rqst *rqstp,
1546                   struct nfsd4_compound_state *cstate,
1547                   struct nfsd4_exchange_id *exid)
1548 {
1549         struct nfs4_client *unconf, *conf, *new;
1550         __be32 status;
1551         unsigned int            strhashval;
1552         char                    dname[HEXDIR_LEN];
1553         char                    addr_str[INET6_ADDRSTRLEN];
1554         nfs4_verifier           verf = exid->verifier;
1555         struct sockaddr         *sa = svc_addr(rqstp);
1556         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1557
1558         rpc_ntop(sa, addr_str, sizeof(addr_str));
1559         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1560                 "ip_addr=%s flags %x, spa_how %d\n",
1561                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1562                 addr_str, exid->flags, exid->spa_how);
1563
1564         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1565                 return nfserr_inval;
1566
1567         /* Currently only support SP4_NONE */
1568         switch (exid->spa_how) {
1569         case SP4_NONE:
1570                 break;
1571         case SP4_SSV:
1572                 return nfserr_serverfault;
1573         default:
1574                 BUG();                          /* checked by xdr code */
1575         case SP4_MACH_CRED:
1576                 return nfserr_serverfault;      /* no excuse :-/ */
1577         }
1578
1579         status = nfs4_make_rec_clidname(dname, &exid->clname);
1580
1581         if (status)
1582                 return status;
1583
1584         strhashval = clientstr_hashval(dname);
1585
1586         /* Cases below refer to rfc 5661 section 18.35.4: */
1587         nfs4_lock_state();
1588         conf = find_confirmed_client_by_str(dname, strhashval);
1589         if (conf) {
1590                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1591                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1592
1593                 if (update) {
1594                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                         if (!creds_match) { /* case 9 */
1599                                 status = nfserr_perm;
1600                                 goto out;
1601                         }
1602                         if (!verfs_match) { /* case 8 */
1603                                 status = nfserr_not_same;
1604                                 goto out;
1605                         }
1606                         /* case 6 */
1607                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1608                         new = conf;
1609                         goto out_copy;
1610                 }
1611                 if (!creds_match) { /* case 3 */
1612                         if (client_has_state(conf)) {
1613                                 status = nfserr_clid_inuse;
1614                                 goto out;
1615                         }
1616                         goto expire_client;
1617                 }
1618                 if (verfs_match) { /* case 2 */
1619                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1620                         new = conf;
1621                         goto out_copy;
1622                 }
1623                 /* case 5, client reboot */
1624 expire_client:
1625                 expire_client(conf);
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 = 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                         dprintk("Got a create_session replay! seqid= %d\n",
1753                                 cs_slot->sl_seqid);
1754                         /* Return the cached reply status */
1755                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1756                         goto out;
1757                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1758                         status = nfserr_seq_misordered;
1759                         dprintk("Sequence misordered!\n");
1760                         dprintk("Expected seqid= %d but got seqid= %d\n",
1761                                 cs_slot->sl_seqid, cr_ses->seqid);
1762                         goto out;
1763                 }
1764         } else if (unconf) {
1765                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1766                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1767                         status = nfserr_clid_inuse;
1768                         goto out;
1769                 }
1770
1771                 cs_slot = &unconf->cl_cs_slot;
1772                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1773                 if (status) {
1774                         /* an unconfirmed replay returns misordered */
1775                         status = nfserr_seq_misordered;
1776                         goto out;
1777                 }
1778
1779                 confirm_me = true;
1780                 conf = unconf;
1781         } else {
1782                 status = nfserr_stale_clientid;
1783                 goto out;
1784         }
1785
1786         /*
1787          * XXX: we should probably set this at creation time, and check
1788          * for consistent minorversion use throughout:
1789          */
1790         conf->cl_minorversion = 1;
1791         /*
1792          * We do not support RDMA or persistent sessions
1793          */
1794         cr_ses->flags &= ~SESSION4_PERSIST;
1795         cr_ses->flags &= ~SESSION4_RDMA;
1796
1797         status = nfserr_toosmall;
1798         if (check_forechannel_attrs(cr_ses->fore_channel))
1799                 goto out;
1800
1801         status = nfserr_jukebox;
1802         new = alloc_init_session(rqstp, conf, cr_ses);
1803         if (!new)
1804                 goto out;
1805         status = nfs_ok;
1806         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1807                NFS4_MAX_SESSIONID_LEN);
1808         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1809                 sizeof(struct nfsd4_channel_attrs));
1810         cs_slot->sl_seqid++;
1811         cr_ses->seqid = cs_slot->sl_seqid;
1812
1813         /* cache solo and embedded create sessions under the state lock */
1814         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1815         if (confirm_me)
1816                 move_to_confirmed(conf);
1817 out:
1818         nfs4_unlock_state();
1819         dprintk("%s returns %d\n", __func__, ntohl(status));
1820         return status;
1821 }
1822
1823 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1824 {
1825         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1826         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1827
1828         return argp->opcnt == resp->opcnt;
1829 }
1830
1831 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1832 {
1833         switch (*dir) {
1834         case NFS4_CDFC4_FORE:
1835         case NFS4_CDFC4_BACK:
1836                 return nfs_ok;
1837         case NFS4_CDFC4_FORE_OR_BOTH:
1838         case NFS4_CDFC4_BACK_OR_BOTH:
1839                 *dir = NFS4_CDFC4_BOTH;
1840                 return nfs_ok;
1841         };
1842         return nfserr_inval;
1843 }
1844
1845 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1846                      struct nfsd4_compound_state *cstate,
1847                      struct nfsd4_bind_conn_to_session *bcts)
1848 {
1849         __be32 status;
1850
1851         if (!nfsd4_last_compound_op(rqstp))
1852                 return nfserr_not_only_op;
1853         spin_lock(&client_lock);
1854         cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1855         /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1856          * client_lock iself: */
1857         if (cstate->session) {
1858                 nfsd4_get_session(cstate->session);
1859                 atomic_inc(&cstate->session->se_client->cl_refcount);
1860         }
1861         spin_unlock(&client_lock);
1862         if (!cstate->session)
1863                 return nfserr_badsession;
1864
1865         status = nfsd4_map_bcts_dir(&bcts->dir);
1866         if (!status)
1867                 nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
1868         return status;
1869 }
1870
1871 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1872 {
1873         if (!session)
1874                 return 0;
1875         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1876 }
1877
1878 __be32
1879 nfsd4_destroy_session(struct svc_rqst *r,
1880                       struct nfsd4_compound_state *cstate,
1881                       struct nfsd4_destroy_session *sessionid)
1882 {
1883         struct nfsd4_session *ses;
1884         __be32 status = nfserr_badsession;
1885
1886         /* Notes:
1887          * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1888          * - Should we return nfserr_back_chan_busy if waiting for
1889          *   callbacks on to-be-destroyed session?
1890          * - Do we need to clear any callback info from previous session?
1891          */
1892
1893         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1894                 if (!nfsd4_last_compound_op(r))
1895                         return nfserr_not_only_op;
1896         }
1897         dump_sessionid(__func__, &sessionid->sessionid);
1898         spin_lock(&client_lock);
1899         ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1900         if (!ses) {
1901                 spin_unlock(&client_lock);
1902                 goto out;
1903         }
1904
1905         unhash_session(ses);
1906         spin_unlock(&client_lock);
1907
1908         nfs4_lock_state();
1909         nfsd4_probe_callback_sync(ses->se_client);
1910         nfs4_unlock_state();
1911
1912         spin_lock(&client_lock);
1913         nfsd4_del_conns(ses);
1914         nfsd4_put_session_locked(ses);
1915         spin_unlock(&client_lock);
1916         status = nfs_ok;
1917 out:
1918         dprintk("%s returns %d\n", __func__, ntohl(status));
1919         return status;
1920 }
1921
1922 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1923 {
1924         struct nfsd4_conn *c;
1925
1926         list_for_each_entry(c, &s->se_conns, cn_persession) {
1927                 if (c->cn_xprt == xpt) {
1928                         return c;
1929                 }
1930         }
1931         return NULL;
1932 }
1933
1934 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1935 {
1936         struct nfs4_client *clp = ses->se_client;
1937         struct nfsd4_conn *c;
1938         int ret;
1939
1940         spin_lock(&clp->cl_lock);
1941         c = __nfsd4_find_conn(new->cn_xprt, ses);
1942         if (c) {
1943                 spin_unlock(&clp->cl_lock);
1944                 free_conn(new);
1945                 return;
1946         }
1947         __nfsd4_hash_conn(new, ses);
1948         spin_unlock(&clp->cl_lock);
1949         ret = nfsd4_register_conn(new);
1950         if (ret)
1951                 /* oops; xprt is already down: */
1952                 nfsd4_conn_lost(&new->cn_xpt_user);
1953         return;
1954 }
1955
1956 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
1957 {
1958         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1959
1960         return args->opcnt > session->se_fchannel.maxops;
1961 }
1962
1963 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
1964                                   struct nfsd4_session *session)
1965 {
1966         struct xdr_buf *xb = &rqstp->rq_arg;
1967
1968         return xb->len > session->se_fchannel.maxreq_sz;
1969 }
1970
1971 __be32
1972 nfsd4_sequence(struct svc_rqst *rqstp,
1973                struct nfsd4_compound_state *cstate,
1974                struct nfsd4_sequence *seq)
1975 {
1976         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1977         struct nfsd4_session *session;
1978         struct nfsd4_slot *slot;
1979         struct nfsd4_conn *conn;
1980         __be32 status;
1981
1982         if (resp->opcnt != 1)
1983                 return nfserr_sequence_pos;
1984
1985         /*
1986          * Will be either used or freed by nfsd4_sequence_check_conn
1987          * below.
1988          */
1989         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1990         if (!conn)
1991                 return nfserr_jukebox;
1992
1993         spin_lock(&client_lock);
1994         status = nfserr_badsession;
1995         session = find_in_sessionid_hashtbl(&seq->sessionid);
1996         if (!session)
1997                 goto out;
1998
1999         status = nfserr_too_many_ops;
2000         if (nfsd4_session_too_many_ops(rqstp, session))
2001                 goto out;
2002
2003         status = nfserr_req_too_big;
2004         if (nfsd4_request_too_big(rqstp, session))
2005                 goto out;
2006
2007         status = nfserr_badslot;
2008         if (seq->slotid >= session->se_fchannel.maxreqs)
2009                 goto out;
2010
2011         slot = session->se_slots[seq->slotid];
2012         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2013
2014         /* We do not negotiate the number of slots yet, so set the
2015          * maxslots to the session maxreqs which is used to encode
2016          * sr_highest_slotid and the sr_target_slot id to maxslots */
2017         seq->maxslots = session->se_fchannel.maxreqs;
2018
2019         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2020                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2021         if (status == nfserr_replay_cache) {
2022                 status = nfserr_seq_misordered;
2023                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2024                         goto out;
2025                 cstate->slot = slot;
2026                 cstate->session = session;
2027                 /* Return the cached reply status and set cstate->status
2028                  * for nfsd4_proc_compound processing */
2029                 status = nfsd4_replay_cache_entry(resp, seq);
2030                 cstate->status = nfserr_replay_cache;
2031                 goto out;
2032         }
2033         if (status)
2034                 goto out;
2035
2036         nfsd4_sequence_check_conn(conn, session);
2037         conn = NULL;
2038
2039         /* Success! bump slot seqid */
2040         slot->sl_seqid = seq->seqid;
2041         slot->sl_flags |= NFSD4_SLOT_INUSE;
2042         if (seq->cachethis)
2043                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2044         else
2045                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2046
2047         cstate->slot = slot;
2048         cstate->session = session;
2049
2050 out:
2051         /* Hold a session reference until done processing the compound. */
2052         if (cstate->session) {
2053                 struct nfs4_client *clp = session->se_client;
2054
2055                 nfsd4_get_session(cstate->session);
2056                 atomic_inc(&clp->cl_refcount);
2057                 switch (clp->cl_cb_state) {
2058                 case NFSD4_CB_DOWN:
2059                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2060                         break;
2061                 case NFSD4_CB_FAULT:
2062                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2063                         break;
2064                 default:
2065                         seq->status_flags = 0;
2066                 }
2067         }
2068         kfree(conn);
2069         spin_unlock(&client_lock);
2070         dprintk("%s: return %d\n", __func__, ntohl(status));
2071         return status;
2072 }
2073
2074 static inline bool has_resources(struct nfs4_client *clp)
2075 {
2076         return !list_empty(&clp->cl_openowners)
2077                 || !list_empty(&clp->cl_delegations)
2078                 || !list_empty(&clp->cl_sessions);
2079 }
2080
2081 __be32
2082 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2083 {
2084         struct nfs4_client *conf, *unconf, *clp;
2085         __be32 status = 0;
2086
2087         nfs4_lock_state();
2088         unconf = find_unconfirmed_client(&dc->clientid);
2089         conf = find_confirmed_client(&dc->clientid);
2090
2091         if (conf) {
2092                 clp = conf;
2093
2094                 if (!is_client_expired(conf) && has_resources(conf)) {
2095                         status = nfserr_clientid_busy;
2096                         goto out;
2097                 }
2098
2099                 /* rfc5661 18.50.3 */
2100                 if (cstate->session && conf == cstate->session->se_client) {
2101                         status = nfserr_clientid_busy;
2102                         goto out;
2103                 }
2104         } else if (unconf)
2105                 clp = unconf;
2106         else {
2107                 status = nfserr_stale_clientid;
2108                 goto out;
2109         }
2110
2111         expire_client(clp);
2112 out:
2113         nfs4_unlock_state();
2114         dprintk("%s return %d\n", __func__, ntohl(status));
2115         return status;
2116 }
2117
2118 __be32
2119 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2120 {
2121         __be32 status = 0;
2122
2123         if (rc->rca_one_fs) {
2124                 if (!cstate->current_fh.fh_dentry)
2125                         return nfserr_nofilehandle;
2126                 /*
2127                  * We don't take advantage of the rca_one_fs case.
2128                  * That's OK, it's optional, we can safely ignore it.
2129                  */
2130                  return nfs_ok;
2131         }
2132
2133         nfs4_lock_state();
2134         status = nfserr_complete_already;
2135         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2136                              &cstate->session->se_client->cl_flags))
2137                 goto out;
2138
2139         status = nfserr_stale_clientid;
2140         if (is_client_expired(cstate->session->se_client))
2141                 /*
2142                  * The following error isn't really legal.
2143                  * But we only get here if the client just explicitly
2144                  * destroyed the client.  Surely it no longer cares what
2145                  * error it gets back on an operation for the dead
2146                  * client.
2147                  */
2148                 goto out;
2149
2150         status = nfs_ok;
2151         nfsd4_client_record_create(cstate->session->se_client);
2152 out:
2153         nfs4_unlock_state();
2154         return status;
2155 }
2156
2157 __be32
2158 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2159                   struct nfsd4_setclientid *setclid)
2160 {
2161         struct xdr_netobj       clname = setclid->se_name;
2162         nfs4_verifier           clverifier = setclid->se_verf;
2163         unsigned int            strhashval;
2164         struct nfs4_client      *conf, *unconf, *new;
2165         __be32                  status;
2166         char                    dname[HEXDIR_LEN];
2167
2168         status = nfs4_make_rec_clidname(dname, &clname);
2169         if (status)
2170                 return status;
2171
2172         strhashval = clientstr_hashval(dname);
2173
2174         /* Cases below refer to rfc 3530 section 14.2.33: */
2175         nfs4_lock_state();
2176         conf = find_confirmed_client_by_str(dname, strhashval);
2177         if (conf) {
2178                 /* case 0: */
2179                 status = nfserr_clid_inuse;
2180                 if (clp_used_exchangeid(conf))
2181                         goto out;
2182                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2183                         char addr_str[INET6_ADDRSTRLEN];
2184                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2185                                  sizeof(addr_str));
2186                         dprintk("NFSD: setclientid: string in use by client "
2187                                 "at %s\n", addr_str);
2188                         goto out;
2189                 }
2190         }
2191         unconf = find_unconfirmed_client_by_str(dname, strhashval);
2192         if (unconf)
2193                 expire_client(unconf);
2194         status = nfserr_jukebox;
2195         new = create_client(clname, dname, rqstp, &clverifier);
2196         if (new == NULL)
2197                 goto out;
2198         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2199                 /* case 1: probable callback update */
2200                 copy_clid(new, conf);
2201         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2202                 gen_clid(new);
2203         /*
2204          * XXX: we should probably set this at creation time, and check
2205          * for consistent minorversion use throughout:
2206          */
2207         new->cl_minorversion = 0;
2208         gen_callback(new, setclid, rqstp);
2209         add_to_unconfirmed(new, strhashval);
2210         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2211         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2212         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2213         status = nfs_ok;
2214 out:
2215         nfs4_unlock_state();
2216         return status;
2217 }
2218
2219
2220 __be32
2221 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2222                          struct nfsd4_compound_state *cstate,
2223                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2224 {
2225         struct nfs4_client *conf, *unconf;
2226         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2227         clientid_t * clid = &setclientid_confirm->sc_clientid;
2228         __be32 status;
2229
2230         if (STALE_CLIENTID(clid))
2231                 return nfserr_stale_clientid;
2232         nfs4_lock_state();
2233
2234         conf = find_confirmed_client(clid);
2235         unconf = find_unconfirmed_client(clid);
2236         /*
2237          * We try hard to give out unique clientid's, so if we get an
2238          * attempt to confirm the same clientid with a different cred,
2239          * there's a bug somewhere.  Let's charitably assume it's our
2240          * bug.
2241          */
2242         status = nfserr_serverfault;
2243         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2244                 goto out;
2245         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2246                 goto out;
2247         /* cases below refer to rfc 3530 section 14.2.34: */
2248         if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
2249                 /* case 1: callback update */
2250                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2251                 nfsd4_probe_callback(conf);
2252                 expire_client(unconf);
2253                 status = nfs_ok;
2254         } else if (conf && !unconf) {
2255                 status = nfs_ok;
2256         } else if (!conf && unconf
2257                         && same_verf(&unconf->cl_confirm, &confirm)) {
2258                 /* case 3: normal case; new or rebooted client */
2259                 unsigned int hash = clientstr_hashval(unconf->cl_recdir);
2260                 conf = find_confirmed_client_by_str(unconf->cl_recdir, hash);
2261                 if (conf) {
2262                         nfsd4_client_record_remove(conf);
2263                         expire_client(conf);
2264                 }
2265                 move_to_confirmed(unconf);
2266                 conf = unconf;
2267                 nfsd4_probe_callback(conf);
2268                 status = nfs_ok;
2269         } else if ((!conf || !same_verf(&conf->cl_confirm, &confirm))
2270             && (!unconf || !same_verf(&unconf->cl_confirm, &confirm))) {
2271                 /* case 4: client hasn't noticed we rebooted yet? */
2272                 status = nfserr_stale_clientid;
2273         }
2274 out:
2275         nfs4_unlock_state();
2276         return status;
2277 }
2278
2279 static struct nfs4_file *nfsd4_alloc_file(void)
2280 {
2281         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2282 }
2283
2284 /* OPEN Share state helper functions */
2285 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2286 {
2287         unsigned int hashval = file_hashval(ino);
2288
2289         atomic_set(&fp->fi_ref, 1);
2290         INIT_LIST_HEAD(&fp->fi_hash);
2291         INIT_LIST_HEAD(&fp->fi_stateids);
2292         INIT_LIST_HEAD(&fp->fi_delegations);
2293         fp->fi_inode = igrab(ino);
2294         fp->fi_had_conflict = false;
2295         fp->fi_lease = NULL;
2296         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2297         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2298         spin_lock(&recall_lock);
2299         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2300         spin_unlock(&recall_lock);
2301 }
2302
2303 static void
2304 nfsd4_free_slab(struct kmem_cache **slab)
2305 {
2306         if (*slab == NULL)
2307                 return;
2308         kmem_cache_destroy(*slab);
2309         *slab = NULL;
2310 }
2311
2312 void
2313 nfsd4_free_slabs(void)
2314 {
2315         nfsd4_free_slab(&openowner_slab);
2316         nfsd4_free_slab(&lockowner_slab);
2317         nfsd4_free_slab(&file_slab);
2318         nfsd4_free_slab(&stateid_slab);
2319         nfsd4_free_slab(&deleg_slab);
2320 }
2321
2322 int
2323 nfsd4_init_slabs(void)
2324 {
2325         openowner_slab = kmem_cache_create("nfsd4_openowners",
2326                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2327         if (openowner_slab == NULL)
2328                 goto out_nomem;
2329         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2330                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2331         if (lockowner_slab == NULL)
2332                 goto out_nomem;
2333         file_slab = kmem_cache_create("nfsd4_files",
2334                         sizeof(struct nfs4_file), 0, 0, NULL);
2335         if (file_slab == NULL)
2336                 goto out_nomem;
2337         stateid_slab = kmem_cache_create("nfsd4_stateids",
2338                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2339         if (stateid_slab == NULL)
2340                 goto out_nomem;
2341         deleg_slab = kmem_cache_create("nfsd4_delegations",
2342                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2343         if (deleg_slab == NULL)
2344                 goto out_nomem;
2345         return 0;
2346 out_nomem:
2347         nfsd4_free_slabs();
2348         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2349         return -ENOMEM;
2350 }
2351
2352 void nfs4_free_openowner(struct nfs4_openowner *oo)
2353 {
2354         kfree(oo->oo_owner.so_owner.data);
2355         kmem_cache_free(openowner_slab, oo);
2356 }
2357
2358 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2359 {
2360         kfree(lo->lo_owner.so_owner.data);
2361         kmem_cache_free(lockowner_slab, lo);
2362 }
2363
2364 static void init_nfs4_replay(struct nfs4_replay *rp)
2365 {
2366         rp->rp_status = nfserr_serverfault;
2367         rp->rp_buflen = 0;
2368         rp->rp_buf = rp->rp_ibuf;
2369 }
2370
2371 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2372 {
2373         struct nfs4_stateowner *sop;
2374
2375         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2376         if (!sop)
2377                 return NULL;
2378
2379         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2380         if (!sop->so_owner.data) {
2381                 kmem_cache_free(slab, sop);
2382                 return NULL;
2383         }
2384         sop->so_owner.len = owner->len;
2385
2386         INIT_LIST_HEAD(&sop->so_stateids);
2387         sop->so_client = clp;
2388         init_nfs4_replay(&sop->so_replay);
2389         return sop;
2390 }
2391
2392 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2393 {
2394         list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
2395         list_add(&oo->oo_perclient, &clp->cl_openowners);
2396 }
2397
2398 static struct nfs4_openowner *
2399 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2400         struct nfs4_openowner *oo;
2401
2402         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2403         if (!oo)
2404                 return NULL;
2405         oo->oo_owner.so_is_open_owner = 1;
2406         oo->oo_owner.so_seqid = open->op_seqid;
2407         oo->oo_flags = NFS4_OO_NEW;
2408         oo->oo_time = 0;
2409         oo->oo_last_closed_stid = NULL;
2410         INIT_LIST_HEAD(&oo->oo_close_lru);
2411         hash_openowner(oo, clp, strhashval);
2412         return oo;
2413 }
2414
2415 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2416         struct nfs4_openowner *oo = open->op_openowner;
2417         struct nfs4_client *clp = oo->oo_owner.so_client;
2418
2419         init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2420         INIT_LIST_HEAD(&stp->st_lockowners);
2421         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2422         list_add(&stp->st_perfile, &fp->fi_stateids);
2423         stp->st_stateowner = &oo->oo_owner;
2424         get_nfs4_file(fp);
2425         stp->st_file = fp;
2426         stp->st_access_bmap = 0;
2427         stp->st_deny_bmap = 0;
2428         set_access(open->op_share_access, stp);
2429         set_deny(open->op_share_deny, stp);
2430         stp->st_openstp = NULL;
2431 }
2432
2433 static void
2434 move_to_close_lru(struct nfs4_openowner *oo)
2435 {
2436         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2437
2438         list_move_tail(&oo->oo_close_lru, &close_lru);
2439         oo->oo_time = get_seconds();
2440 }
2441
2442 static int
2443 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2444                                                         clientid_t *clid)
2445 {
2446         return (sop->so_owner.len == owner->len) &&
2447                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2448                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2449 }
2450
2451 static struct nfs4_openowner *
2452 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2453 {
2454         struct nfs4_stateowner *so;
2455         struct nfs4_openowner *oo;
2456
2457         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2458                 if (!so->so_is_open_owner)
2459                         continue;
2460                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2461                         oo = openowner(so);
2462                         renew_client(oo->oo_owner.so_client);
2463                         return oo;
2464                 }
2465         }
2466         return NULL;
2467 }
2468
2469 /* search file_hashtbl[] for file */
2470 static struct nfs4_file *
2471 find_file(struct inode *ino)
2472 {
2473         unsigned int hashval = file_hashval(ino);
2474         struct nfs4_file *fp;
2475
2476         spin_lock(&recall_lock);
2477         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2478                 if (fp->fi_inode == ino) {
2479                         get_nfs4_file(fp);
2480                         spin_unlock(&recall_lock);
2481                         return fp;
2482                 }
2483         }
2484         spin_unlock(&recall_lock);
2485         return NULL;
2486 }
2487
2488 /*
2489  * Called to check deny when READ with all zero stateid or
2490  * WRITE with all zero or all one stateid
2491  */
2492 static __be32
2493 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2494 {
2495         struct inode *ino = current_fh->fh_dentry->d_inode;
2496         struct nfs4_file *fp;
2497         struct nfs4_ol_stateid *stp;
2498         __be32 ret;
2499
2500         dprintk("NFSD: nfs4_share_conflict\n");
2501
2502         fp = find_file(ino);
2503         if (!fp)
2504                 return nfs_ok;
2505         ret = nfserr_locked;
2506         /* Search for conflicting share reservations */
2507         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2508                 if (test_deny(deny_type, stp) ||
2509                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2510                         goto out;
2511         }
2512         ret = nfs_ok;
2513 out:
2514         put_nfs4_file(fp);
2515         return ret;
2516 }
2517
2518 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2519 {
2520         /* We're assuming the state code never drops its reference
2521          * without first removing the lease.  Since we're in this lease
2522          * callback (and since the lease code is serialized by the kernel
2523          * lock) we know the server hasn't removed the lease yet, we know
2524          * it's safe to take a reference: */
2525         atomic_inc(&dp->dl_count);
2526
2527         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2528
2529         /* only place dl_time is set. protected by lock_flocks*/
2530         dp->dl_time = get_seconds();
2531
2532         nfsd4_cb_recall(dp);
2533 }
2534
2535 /* Called from break_lease() with lock_flocks() held. */
2536 static void nfsd_break_deleg_cb(struct file_lock *fl)
2537 {
2538         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2539         struct nfs4_delegation *dp;
2540
2541         BUG_ON(!fp);
2542         /* We assume break_lease is only called once per lease: */
2543         BUG_ON(fp->fi_had_conflict);
2544         /*
2545          * We don't want the locks code to timeout the lease for us;
2546          * we'll remove it ourself if a delegation isn't returned
2547          * in time:
2548          */
2549         fl->fl_break_time = 0;
2550
2551         spin_lock(&recall_lock);
2552         fp->fi_had_conflict = true;
2553         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2554                 nfsd_break_one_deleg(dp);
2555         spin_unlock(&recall_lock);
2556 }
2557
2558 static
2559 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2560 {
2561         if (arg & F_UNLCK)
2562                 return lease_modify(onlist, arg);
2563         else
2564                 return -EAGAIN;
2565 }
2566
2567 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2568         .lm_break = nfsd_break_deleg_cb,
2569         .lm_change = nfsd_change_deleg_cb,
2570 };
2571
2572 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2573 {
2574         if (nfsd4_has_session(cstate))
2575                 return nfs_ok;
2576         if (seqid == so->so_seqid - 1)
2577                 return nfserr_replay_me;
2578         if (seqid == so->so_seqid)
2579                 return nfs_ok;
2580         return nfserr_bad_seqid;
2581 }
2582
2583 __be32
2584 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2585                     struct nfsd4_open *open)
2586 {
2587         clientid_t *clientid = &open->op_clientid;
2588         struct nfs4_client *clp = NULL;
2589         unsigned int strhashval;
2590         struct nfs4_openowner *oo = NULL;
2591         __be32 status;
2592
2593         if (STALE_CLIENTID(&open->op_clientid))
2594                 return nfserr_stale_clientid;
2595         /*
2596          * In case we need it later, after we've already created the
2597          * file and don't want to risk a further failure:
2598          */
2599         open->op_file = nfsd4_alloc_file();
2600         if (open->op_file == NULL)
2601                 return nfserr_jukebox;
2602
2603         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2604         oo = find_openstateowner_str(strhashval, open);
2605         open->op_openowner = oo;
2606         if (!oo) {
2607                 clp = find_confirmed_client(clientid);
2608                 if (clp == NULL)
2609                         return nfserr_expired;
2610                 goto new_owner;
2611         }
2612         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2613                 /* Replace unconfirmed owners without checking for replay. */
2614                 clp = oo->oo_owner.so_client;
2615                 release_openowner(oo);
2616                 open->op_openowner = NULL;
2617                 goto new_owner;
2618         }
2619         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2620         if (status)
2621                 return status;
2622         clp = oo->oo_owner.so_client;
2623         goto alloc_stateid;
2624 new_owner:
2625         oo = alloc_init_open_stateowner(strhashval, clp, open);
2626         if (oo == NULL)
2627                 return nfserr_jukebox;
2628         open->op_openowner = oo;
2629 alloc_stateid:
2630         open->op_stp = nfs4_alloc_stateid(clp);
2631         if (!open->op_stp)
2632                 return nfserr_jukebox;
2633         return nfs_ok;
2634 }
2635
2636 static inline __be32
2637 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2638 {
2639         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2640                 return nfserr_openmode;
2641         else
2642                 return nfs_ok;
2643 }
2644
2645 static int share_access_to_flags(u32 share_access)
2646 {
2647         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2648 }
2649
2650 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2651 {
2652         struct nfs4_stid *ret;
2653
2654         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2655         if (!ret)
2656                 return NULL;
2657         return delegstateid(ret);
2658 }
2659
2660 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2661 {
2662         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2663                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2664 }
2665
2666 static __be32
2667 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2668                 struct nfs4_delegation **dp)
2669 {
2670         int flags;
2671         __be32 status = nfserr_bad_stateid;
2672
2673         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2674         if (*dp == NULL)
2675                 goto out;
2676         flags = share_access_to_flags(open->op_share_access);
2677         status = nfs4_check_delegmode(*dp, flags);
2678         if (status)
2679                 *dp = NULL;
2680 out:
2681         if (!nfsd4_is_deleg_cur(open))
2682                 return nfs_ok;
2683         if (status)
2684                 return status;
2685         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2686         return nfs_ok;
2687 }
2688
2689 static __be32
2690 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2691 {
2692         struct nfs4_ol_stateid *local;
2693         struct nfs4_openowner *oo = open->op_openowner;
2694
2695         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2696                 /* ignore lock owners */
2697                 if (local->st_stateowner->so_is_open_owner == 0)
2698                         continue;
2699                 /* remember if we have seen this open owner */
2700                 if (local->st_stateowner == &oo->oo_owner)
2701                         *stpp = local;
2702                 /* check for conflicting share reservations */
2703                 if (!test_share(local, open))
2704                         return nfserr_share_denied;
2705         }
2706         return nfs_ok;
2707 }
2708
2709 static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
2710 {
2711         kmem_cache_free(stateid_slab, s);
2712 }
2713
2714 static inline int nfs4_access_to_access(u32 nfs4_access)
2715 {
2716         int flags = 0;
2717
2718         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2719                 flags |= NFSD_MAY_READ;
2720         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2721                 flags |= NFSD_MAY_WRITE;
2722         return flags;
2723 }
2724
2725 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2726                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2727 {
2728         __be32 status;
2729         int oflag = nfs4_access_to_omode(open->op_share_access);
2730         int access = nfs4_access_to_access(open->op_share_access);
2731
2732         if (!fp->fi_fds[oflag]) {
2733                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2734                         &fp->fi_fds[oflag]);
2735                 if (status)
2736                         return status;
2737         }
2738         nfs4_file_get_access(fp, oflag);
2739
2740         return nfs_ok;
2741 }
2742
2743 static inline __be32
2744 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2745                 struct nfsd4_open *open)
2746 {
2747         struct iattr iattr = {
2748                 .ia_valid = ATTR_SIZE,
2749                 .ia_size = 0,
2750         };
2751         if (!open->op_truncate)
2752                 return 0;
2753         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2754                 return nfserr_inval;
2755         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2756 }
2757
2758 static __be32
2759 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)
2760 {
2761         u32 op_share_access = open->op_share_access;
2762         bool new_access;
2763         __be32 status;
2764
2765         new_access = !test_access(op_share_access, stp);
2766         if (new_access) {
2767                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2768                 if (status)
2769                         return status;
2770         }
2771         status = nfsd4_truncate(rqstp, cur_fh, open);
2772         if (status) {
2773                 if (new_access) {
2774                         int oflag = nfs4_access_to_omode(op_share_access);
2775                         nfs4_file_put_access(fp, oflag);
2776                 }
2777                 return status;
2778         }
2779         /* remember the open */
2780         set_access(op_share_access, stp);
2781         set_deny(open->op_share_deny, stp);
2782
2783         return nfs_ok;
2784 }
2785
2786
2787 static void
2788 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2789 {
2790         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2791 }
2792
2793 /* Should we give out recallable state?: */
2794 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2795 {
2796         if (clp->cl_cb_state == NFSD4_CB_UP)
2797                 return true;
2798         /*
2799          * In the sessions case, since we don't have to establish a
2800          * separate connection for callbacks, we assume it's OK
2801          * until we hear otherwise:
2802          */
2803         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2804 }
2805
2806 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2807 {
2808         struct file_lock *fl;
2809
2810         fl = locks_alloc_lock();
2811         if (!fl)
2812                 return NULL;
2813         locks_init_lock(fl);
2814         fl->fl_lmops = &nfsd_lease_mng_ops;
2815         fl->fl_flags = FL_LEASE;
2816         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2817         fl->fl_end = OFFSET_MAX;
2818         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2819         fl->fl_pid = current->tgid;
2820         return fl;
2821 }
2822
2823 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2824 {
2825         struct nfs4_file *fp = dp->dl_file;
2826         struct file_lock *fl;
2827         int status;
2828
2829         fl = nfs4_alloc_init_lease(dp, flag);
2830         if (!fl)
2831                 return -ENOMEM;
2832         fl->fl_file = find_readable_file(fp);
2833         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2834         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2835         if (status) {
2836                 list_del_init(&dp->dl_perclnt);
2837                 locks_free_lock(fl);
2838                 return -ENOMEM;
2839         }
2840         fp->fi_lease = fl;
2841         fp->fi_deleg_file = fl->fl_file;
2842         get_file(fp->fi_deleg_file);
2843         atomic_set(&fp->fi_delegees, 1);
2844         list_add(&dp->dl_perfile, &fp->fi_delegations);
2845         return 0;
2846 }
2847
2848 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2849 {
2850         struct nfs4_file *fp = dp->dl_file;
2851
2852         if (!fp->fi_lease)
2853                 return nfs4_setlease(dp, flag);
2854         spin_lock(&recall_lock);
2855         if (fp->fi_had_conflict) {
2856                 spin_unlock(&recall_lock);
2857                 return -EAGAIN;
2858         }
2859         atomic_inc(&fp->fi_delegees);
2860         list_add(&dp->dl_perfile, &fp->fi_delegations);
2861         spin_unlock(&recall_lock);
2862         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2863         return 0;
2864 }
2865
2866 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2867 {
2868         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2869         if (status == -EAGAIN)
2870                 open->op_why_no_deleg = WND4_CONTENTION;
2871         else {
2872                 open->op_why_no_deleg = WND4_RESOURCE;
2873                 switch (open->op_deleg_want) {
2874                 case NFS4_SHARE_WANT_READ_DELEG:
2875                 case NFS4_SHARE_WANT_WRITE_DELEG:
2876                 case NFS4_SHARE_WANT_ANY_DELEG:
2877                         break;
2878                 case NFS4_SHARE_WANT_CANCEL:
2879                         open->op_why_no_deleg = WND4_CANCELLED;
2880                         break;
2881                 case NFS4_SHARE_WANT_NO_DELEG:
2882                         BUG();  /* not supposed to get here */
2883                 }
2884         }
2885 }
2886
2887 /*
2888  * Attempt to hand out a delegation.
2889  */
2890 static void
2891 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2892 {
2893         struct nfs4_delegation *dp;
2894         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2895         int cb_up;
2896         int status = 0, flag = 0;
2897
2898         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2899         flag = NFS4_OPEN_DELEGATE_NONE;
2900         open->op_recall = 0;
2901         switch (open->op_claim_type) {
2902                 case NFS4_OPEN_CLAIM_PREVIOUS:
2903                         if (!cb_up)
2904                                 open->op_recall = 1;
2905                         flag = open->op_delegate_type;
2906                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2907                                 goto out;
2908                         break;
2909                 case NFS4_OPEN_CLAIM_NULL:
2910                         /* Let's not give out any delegations till everyone's
2911                          * had the chance to reclaim theirs.... */
2912                         if (locks_in_grace())
2913                                 goto out;
2914                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2915                                 goto out;
2916                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2917                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2918                         else
2919                                 flag = NFS4_OPEN_DELEGATE_READ;
2920                         break;
2921                 default:
2922                         goto out;
2923         }
2924
2925         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2926         if (dp == NULL)
2927                 goto out_no_deleg;
2928         status = nfs4_set_delegation(dp, flag);
2929         if (status)
2930                 goto out_free;
2931
2932         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2933
2934         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2935                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2936 out:
2937         open->op_delegate_type = flag;
2938         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2939                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2940                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2941                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2942
2943                 /* 4.1 client asking for a delegation? */
2944                 if (open->op_deleg_want)
2945                         nfsd4_open_deleg_none_ext(open, status);
2946         }
2947         return;
2948 out_free:
2949         nfs4_put_delegation(dp);
2950 out_no_deleg:
2951         flag = NFS4_OPEN_DELEGATE_NONE;
2952         goto out;
2953 }
2954
2955 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
2956                                         struct nfs4_delegation *dp)
2957 {
2958         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
2959             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2960                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2961                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
2962         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
2963                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2964                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2965                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
2966         }
2967         /* Otherwise the client must be confused wanting a delegation
2968          * it already has, therefore we don't return
2969          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
2970          */
2971 }
2972
2973 /*
2974  * called with nfs4_lock_state() held.
2975  */
2976 __be32
2977 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2978 {
2979         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2980         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
2981         struct nfs4_file *fp = NULL;
2982         struct inode *ino = current_fh->fh_dentry->d_inode;
2983         struct nfs4_ol_stateid *stp = NULL;
2984         struct nfs4_delegation *dp = NULL;
2985         __be32 status;
2986
2987         /*
2988          * Lookup file; if found, lookup stateid and check open request,
2989          * and check for delegations in the process of being recalled.
2990          * If not found, create the nfs4_file struct
2991          */
2992         fp = find_file(ino);
2993         if (fp) {
2994                 if ((status = nfs4_check_open(fp, open, &stp)))
2995                         goto out;
2996                 status = nfs4_check_deleg(cl, fp, open, &dp);
2997                 if (status)
2998                         goto out;
2999         } else {
3000                 status = nfserr_bad_stateid;
3001                 if (nfsd4_is_deleg_cur(open))
3002                         goto out;
3003                 status = nfserr_jukebox;
3004                 fp = open->op_file;
3005                 open->op_file = NULL;
3006                 nfsd4_init_file(fp, ino);
3007         }
3008
3009         /*
3010          * OPEN the file, or upgrade an existing OPEN.
3011          * If truncate fails, the OPEN fails.
3012          */
3013         if (stp) {
3014                 /* Stateid was found, this is an OPEN upgrade */
3015                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3016                 if (status)
3017                         goto out;
3018         } else {
3019                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3020                 if (status)
3021                         goto out;
3022                 stp = open->op_stp;
3023                 open->op_stp = NULL;
3024                 init_open_stateid(stp, fp, open);
3025                 status = nfsd4_truncate(rqstp, current_fh, open);
3026                 if (status) {
3027                         release_open_stateid(stp);
3028                         goto out;
3029                 }
3030         }
3031         update_stateid(&stp->st_stid.sc_stateid);
3032         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3033
3034         if (nfsd4_has_session(&resp->cstate)) {
3035                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3036
3037                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3038                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3039                         open->op_why_no_deleg = WND4_NOT_WANTED;
3040                         goto nodeleg;
3041                 }
3042         }
3043
3044         /*
3045         * Attempt to hand out a delegation. No error return, because the
3046         * OPEN succeeds even if we fail.
3047         */
3048         nfs4_open_delegation(current_fh, open, stp);
3049 nodeleg:
3050         status = nfs_ok;
3051
3052         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3053                 STATEID_VAL(&stp->st_stid.sc_stateid));
3054 out:
3055         /* 4.1 client trying to upgrade/downgrade delegation? */
3056         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3057             open->op_deleg_want)
3058                 nfsd4_deleg_xgrade_none_ext(open, dp);
3059
3060         if (fp)
3061                 put_nfs4_file(fp);
3062         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3063                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3064         /*
3065         * To finish the open response, we just need to set the rflags.
3066         */
3067         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3068         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3069             !nfsd4_has_session(&resp->cstate))
3070                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3071
3072         return status;
3073 }
3074
3075 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3076 {
3077         if (open->op_openowner) {
3078                 struct nfs4_openowner *oo = open->op_openowner;
3079
3080                 if (!list_empty(&oo->oo_owner.so_stateids))
3081                         list_del_init(&oo->oo_close_lru);
3082                 if (oo->oo_flags & NFS4_OO_NEW) {
3083                         if (status) {
3084                                 release_openowner(oo);
3085                                 open->op_openowner = NULL;
3086                         } else
3087                                 oo->oo_flags &= ~NFS4_OO_NEW;
3088                 }
3089         }
3090         if (open->op_file)
3091                 nfsd4_free_file(open->op_file);
3092         if (open->op_stp)
3093                 nfs4_free_stateid(open->op_stp);
3094 }
3095
3096 __be32
3097 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3098             clientid_t *clid)
3099 {
3100         struct nfs4_client *clp;
3101         __be32 status;
3102
3103         nfs4_lock_state();
3104         dprintk("process_renew(%08x/%08x): starting\n",
3105                         clid->cl_boot, clid->cl_id);
3106         status = nfserr_stale_clientid;
3107         if (STALE_CLIENTID(clid))
3108                 goto out;
3109         clp = find_confirmed_client(clid);
3110         status = nfserr_expired;
3111         if (clp == NULL) {
3112                 /* We assume the client took too long to RENEW. */
3113                 dprintk("nfsd4_renew: clientid not found!\n");
3114                 goto out;
3115         }
3116         status = nfserr_cb_path_down;
3117         if (!list_empty(&clp->cl_delegations)
3118                         && clp->cl_cb_state != NFSD4_CB_UP)
3119                 goto out;
3120         status = nfs_ok;
3121 out:
3122         nfs4_unlock_state();
3123         return status;
3124 }
3125
3126 static struct lock_manager nfsd4_manager = {
3127 };
3128
3129 static bool grace_ended;
3130
3131 static void
3132 nfsd4_end_grace(void)
3133 {
3134         /* do nothing if grace period already ended */
3135         if (grace_ended)
3136                 return;
3137
3138         dprintk("NFSD: end of grace period\n");
3139         grace_ended = true;
3140         nfsd4_record_grace_done(&init_net, boot_time);
3141         locks_end_grace(&nfsd4_manager);
3142         /*
3143          * Now that every NFSv4 client has had the chance to recover and
3144          * to see the (possibly new, possibly shorter) lease time, we
3145          * can safely set the next grace time to the current lease time:
3146          */
3147         nfsd4_grace = nfsd4_lease;
3148 }
3149
3150 static time_t
3151 nfs4_laundromat(void)
3152 {
3153         struct nfs4_client *clp;
3154         struct nfs4_openowner *oo;
3155         struct nfs4_delegation *dp;
3156         struct list_head *pos, *next, reaplist;
3157         time_t cutoff = get_seconds() - nfsd4_lease;
3158         time_t t, clientid_val = nfsd4_lease;
3159         time_t u, test_val = nfsd4_lease;
3160
3161         nfs4_lock_state();
3162
3163         dprintk("NFSD: laundromat service - starting\n");
3164         nfsd4_end_grace();
3165         INIT_LIST_HEAD(&reaplist);
3166         spin_lock(&client_lock);
3167         list_for_each_safe(pos, next, &client_lru) {
3168                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3169                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3170                         t = clp->cl_time - cutoff;
3171                         if (clientid_val > t)
3172                                 clientid_val = t;
3173                         break;
3174                 }
3175                 if (atomic_read(&clp->cl_refcount)) {
3176                         dprintk("NFSD: client in use (clientid %08x)\n",
3177                                 clp->cl_clientid.cl_id);
3178                         continue;
3179                 }
3180                 unhash_client_locked(clp);
3181                 list_add(&clp->cl_lru, &reaplist);
3182         }
3183         spin_unlock(&client_lock);
3184         list_for_each_safe(pos, next, &reaplist) {
3185                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3186                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3187                         clp->cl_clientid.cl_id);
3188                 nfsd4_client_record_remove(clp);
3189                 expire_client(clp);
3190         }
3191         spin_lock(&recall_lock);
3192         list_for_each_safe(pos, next, &del_recall_lru) {
3193                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3194                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3195                         u = dp->dl_time - cutoff;
3196                         if (test_val > u)
3197                                 test_val = u;
3198                         break;
3199                 }
3200                 list_move(&dp->dl_recall_lru, &reaplist);
3201         }
3202         spin_unlock(&recall_lock);
3203         list_for_each_safe(pos, next, &reaplist) {
3204                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3205                 unhash_delegation(dp);
3206         }
3207         test_val = nfsd4_lease;
3208         list_for_each_safe(pos, next, &close_lru) {
3209                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3210                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3211                         u = oo->oo_time - cutoff;
3212                         if (test_val > u)
3213                                 test_val = u;
3214                         break;
3215                 }
3216                 release_openowner(oo);
3217         }
3218         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3219                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3220         nfs4_unlock_state();
3221         return clientid_val;
3222 }
3223
3224 static struct workqueue_struct *laundry_wq;
3225 static void laundromat_main(struct work_struct *);
3226 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3227
3228 static void
3229 laundromat_main(struct work_struct *not_used)
3230 {
3231         time_t t;
3232
3233         t = nfs4_laundromat();
3234         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3235         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3236 }
3237
3238 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3239 {
3240         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3241                 return nfserr_bad_stateid;
3242         return nfs_ok;
3243 }
3244
3245 static int
3246 STALE_STATEID(stateid_t *stateid)
3247 {
3248         if (stateid->si_opaque.so_clid.cl_boot == boot_time)
3249                 return 0;
3250         dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3251                 STATEID_VAL(stateid));
3252         return 1;
3253 }
3254
3255 static inline int
3256 access_permit_read(struct nfs4_ol_stateid *stp)
3257 {
3258         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3259                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3260                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3261 }
3262
3263 static inline int
3264 access_permit_write(struct nfs4_ol_stateid *stp)
3265 {
3266         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3267                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3268 }
3269
3270 static
3271 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3272 {
3273         __be32 status = nfserr_openmode;
3274
3275         /* For lock stateid's, we test the parent open, not the lock: */
3276         if (stp->st_openstp)
3277                 stp = stp->st_openstp;
3278         if ((flags & WR_STATE) && !access_permit_write(stp))
3279                 goto out;
3280         if ((flags & RD_STATE) && !access_permit_read(stp))
3281                 goto out;
3282         status = nfs_ok;
3283 out:
3284         return status;
3285 }
3286
3287 static inline __be32
3288 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
3289 {
3290         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3291                 return nfs_ok;
3292         else if (locks_in_grace()) {
3293                 /* Answer in remaining cases depends on existence of
3294                  * conflicting state; so we must wait out the grace period. */
3295                 return nfserr_grace;
3296         } else if (flags & WR_STATE)
3297                 return nfs4_share_conflict(current_fh,
3298                                 NFS4_SHARE_DENY_WRITE);
3299         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3300                 return nfs4_share_conflict(current_fh,
3301                                 NFS4_SHARE_DENY_READ);
3302 }
3303
3304 /*
3305  * Allow READ/WRITE during grace period on recovered state only for files
3306  * that are not able to provide mandatory locking.
3307  */
3308 static inline int
3309 grace_disallows_io(struct inode *inode)
3310 {
3311         return locks_in_grace() && mandatory_lock(inode);
3312 }
3313
3314 /* Returns true iff a is later than b: */
3315 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3316 {
3317         return (s32)a->si_generation - (s32)b->si_generation > 0;
3318 }
3319
3320 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3321 {
3322         /*
3323          * When sessions are used the stateid generation number is ignored
3324          * when it is zero.
3325          */
3326         if (has_session && in->si_generation == 0)
3327                 return nfs_ok;
3328
3329         if (in->si_generation == ref->si_generation)
3330                 return nfs_ok;
3331
3332         /* If the client sends us a stateid from the future, it's buggy: */
3333         if (stateid_generation_after(in, ref))
3334                 return nfserr_bad_stateid;
3335         /*
3336          * However, we could see a stateid from the past, even from a
3337          * non-buggy client.  For example, if the client sends a lock
3338          * while some IO is outstanding, the lock may bump si_generation
3339          * while the IO is still in flight.  The client could avoid that
3340          * situation by waiting for responses on all the IO requests,
3341          * but better performance may result in retrying IO that
3342          * receives an old_stateid error if requests are rarely
3343          * reordered in flight:
3344          */
3345         return nfserr_old_stateid;
3346 }
3347
3348 __be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3349 {
3350         struct nfs4_stid *s;
3351         struct nfs4_ol_stateid *ols;
3352         __be32 status;
3353
3354         if (STALE_STATEID(stateid))
3355                 return nfserr_stale_stateid;
3356
3357         s = find_stateid(cl, stateid);
3358         if (!s)
3359                  return nfserr_stale_stateid;
3360         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3361         if (status)
3362                 return status;
3363         if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3364                 return nfs_ok;
3365         ols = openlockstateid(s);
3366         if (ols->st_stateowner->so_is_open_owner
3367             && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3368                 return nfserr_bad_stateid;
3369         return nfs_ok;
3370 }
3371
3372 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
3373 {
3374         struct nfs4_client *cl;
3375
3376         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3377                 return nfserr_bad_stateid;
3378         if (STALE_STATEID(stateid))
3379                 return nfserr_stale_stateid;
3380         cl = find_confirmed_client(&stateid->si_opaque.so_clid);
3381         if (!cl)
3382                 return nfserr_expired;
3383         *s = find_stateid_by_type(cl, stateid, typemask);
3384         if (!*s)
3385                 return nfserr_bad_stateid;
3386         return nfs_ok;
3387
3388 }
3389
3390 /*
3391 * Checks for stateid operations
3392 */
3393 __be32
3394 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3395                            stateid_t *stateid, int flags, struct file **filpp)
3396 {
3397         struct nfs4_stid *s;
3398         struct nfs4_ol_stateid *stp = NULL;
3399         struct nfs4_delegation *dp = NULL;
3400         struct svc_fh *current_fh = &cstate->current_fh;
3401         struct inode *ino = current_fh->fh_dentry->d_inode;
3402         __be32 status;
3403
3404         if (filpp)
3405                 *filpp = NULL;
3406
3407         if (grace_disallows_io(ino))
3408                 return nfserr_grace;
3409
3410         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3411                 return check_special_stateids(current_fh, stateid, flags);
3412
3413         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
3414         if (status)
3415                 return status;
3416         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3417         if (status)
3418                 goto out;
3419         switch (s->sc_type) {
3420         case NFS4_DELEG_STID:
3421                 dp = delegstateid(s);
3422                 status = nfs4_check_delegmode(dp, flags);
3423                 if (status)
3424                         goto out;
3425                 if (filpp) {
3426                         *filpp = dp->dl_file->fi_deleg_file;
3427                         BUG_ON(!*filpp);
3428                 }
3429                 break;
3430         case NFS4_OPEN_STID:
3431         case NFS4_LOCK_STID:
3432                 stp = openlockstateid(s);
3433                 status = nfs4_check_fh(current_fh, stp);
3434                 if (status)
3435                         goto out;
3436                 if (stp->st_stateowner->so_is_open_owner
3437                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3438                         goto out;
3439                 status = nfs4_check_openmode(stp, flags);
3440                 if (status)
3441                         goto out;
3442                 if (filpp) {
3443                         if (flags & RD_STATE)
3444                                 *filpp = find_readable_file(stp->st_file);
3445                         else
3446                                 *filpp = find_writeable_file(stp->st_file);
3447                 }
3448                 break;
3449         default:
3450                 return nfserr_bad_stateid;
3451         }
3452         status = nfs_ok;
3453 out:
3454         return status;
3455 }
3456
3457 static __be32
3458 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3459 {
3460         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3461                 return nfserr_locks_held;
3462         release_lock_stateid(stp);
3463         return nfs_ok;
3464 }
3465
3466 /*
3467  * Test if the stateid is valid
3468  */
3469 __be32
3470 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3471                    struct nfsd4_test_stateid *test_stateid)
3472 {
3473         struct nfsd4_test_stateid_id *stateid;
3474         struct nfs4_client *cl = cstate->session->se_client;
3475
3476         nfs4_lock_state();
3477         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3478                 stateid->ts_id_status = nfs4_validate_stateid(cl, &stateid->ts_id_stateid);
3479         nfs4_unlock_state();
3480
3481         return nfs_ok;
3482 }
3483
3484 __be32
3485 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3486                    struct nfsd4_free_stateid *free_stateid)
3487 {
3488         stateid_t *stateid = &free_stateid->fr_stateid;
3489         struct nfs4_stid *s;
3490         struct nfs4_client *cl = cstate->session->se_client;
3491         __be32 ret = nfserr_bad_stateid;
3492
3493         nfs4_lock_state();
3494         s = find_stateid(cl, stateid);
3495         if (!s)
3496                 goto out;
3497         switch (s->sc_type) {
3498         case NFS4_DELEG_STID:
3499                 ret = nfserr_locks_held;
3500                 goto out;
3501         case NFS4_OPEN_STID:
3502         case NFS4_LOCK_STID:
3503                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3504                 if (ret)
3505                         goto out;
3506                 if (s->sc_type == NFS4_LOCK_STID)
3507                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3508                 else
3509                         ret = nfserr_locks_held;
3510                 break;
3511         default:
3512                 ret = nfserr_bad_stateid;
3513         }
3514 out:
3515         nfs4_unlock_state();
3516         return ret;
3517 }
3518
3519 static inline int
3520 setlkflg (int type)
3521 {
3522         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3523                 RD_STATE : WR_STATE;
3524 }
3525
3526 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3527 {
3528         struct svc_fh *current_fh = &cstate->current_fh;
3529         struct nfs4_stateowner *sop = stp->st_stateowner;
3530         __be32 status;
3531
3532         status = nfsd4_check_seqid(cstate, sop, seqid);
3533         if (status)
3534                 return status;
3535         if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3536                 /*
3537                  * "Closed" stateid's exist *only* to return
3538                  * nfserr_replay_me from the previous step.
3539                  */
3540                 return nfserr_bad_stateid;
3541         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3542         if (status)
3543                 return status;
3544         return nfs4_check_fh(current_fh, stp);
3545 }
3546
3547 /*
3548  * Checks for sequence id mutating operations.
3549  */
3550 static __be32
3551 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3552                          stateid_t *stateid, char typemask,
3553                          struct nfs4_ol_stateid **stpp)
3554 {
3555         __be32 status;
3556         struct nfs4_stid *s;
3557
3558         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3559                 seqid, STATEID_VAL(stateid));
3560
3561         *stpp = NULL;
3562         status = nfsd4_lookup_stateid(stateid, typemask, &s);
3563         if (status)
3564                 return status;
3565         *stpp = openlockstateid(s);
3566         cstate->replay_owner = (*stpp)->st_stateowner;
3567
3568         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3569 }
3570
3571 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3572 {
3573         __be32 status;
3574         struct nfs4_openowner *oo;
3575
3576         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3577                                                 NFS4_OPEN_STID, stpp);
3578         if (status)
3579                 return status;
3580         oo = openowner((*stpp)->st_stateowner);
3581         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3582                 return nfserr_bad_stateid;
3583         return nfs_ok;
3584 }
3585
3586 __be32
3587 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3588                    struct nfsd4_open_confirm *oc)
3589 {
3590         __be32 status;
3591         struct nfs4_openowner *oo;
3592         struct nfs4_ol_stateid *stp;
3593
3594         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3595                         (int)cstate->current_fh.fh_dentry->d_name.len,
3596                         cstate->current_fh.fh_dentry->d_name.name);
3597
3598         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3599         if (status)
3600                 return status;
3601
3602         nfs4_lock_state();
3603
3604         status = nfs4_preprocess_seqid_op(cstate,
3605                                         oc->oc_seqid, &oc->oc_req_stateid,
3606                                         NFS4_OPEN_STID, &stp);
3607         if (status)
3608                 goto out;
3609         oo = openowner(stp->st_stateowner);
3610         status = nfserr_bad_stateid;
3611         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3612                 goto out;
3613         oo->oo_flags |= NFS4_OO_CONFIRMED;
3614         update_stateid(&stp->st_stid.sc_stateid);
3615         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3616         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3617                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3618
3619         nfsd4_client_record_create(oo->oo_owner.so_client);
3620         status = nfs_ok;
3621 out:
3622         if (!cstate->replay_owner)
3623                 nfs4_unlock_state();
3624         return status;
3625 }
3626
3627 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3628 {
3629         if (!test_access(access, stp))
3630                 return;
3631         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3632         clear_access(access, stp);
3633 }
3634
3635 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3636 {
3637         switch (to_access) {
3638         case NFS4_SHARE_ACCESS_READ:
3639                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3640                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3641                 break;
3642         case NFS4_SHARE_ACCESS_WRITE:
3643                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3644                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3645                 break;
3646         case NFS4_SHARE_ACCESS_BOTH:
3647                 break;
3648         default:
3649                 BUG();
3650         }
3651 }
3652
3653 static void
3654 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3655 {
3656         int i;
3657         for (i = 0; i < 4; i++) {
3658                 if ((i & deny) != i)
3659                         clear_deny(i, stp);
3660         }
3661 }
3662
3663 __be32
3664 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3665                      struct nfsd4_compound_state *cstate,
3666                      struct nfsd4_open_downgrade *od)
3667 {
3668         __be32 status;
3669         struct nfs4_ol_stateid *stp;
3670
3671         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3672                         (int)cstate->current_fh.fh_dentry->d_name.len,
3673                         cstate->current_fh.fh_dentry->d_name.name);
3674
3675         /* We don't yet support WANT bits: */
3676         if (od->od_deleg_want)
3677                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3678                         od->od_deleg_want);
3679
3680         nfs4_lock_state();
3681         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3682                                         &od->od_stateid, &stp);
3683         if (status)
3684                 goto out;
3685         status = nfserr_inval;
3686         if (!test_access(od->od_share_access, stp)) {
3687                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3688                         stp->st_access_bmap, od->od_share_access);
3689                 goto out;
3690         }
3691         if (!test_deny(od->od_share_deny, stp)) {
3692                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3693                         stp->st_deny_bmap, od->od_share_deny);
3694                 goto out;
3695         }
3696         nfs4_stateid_downgrade(stp, od->od_share_access);
3697
3698         reset_union_bmap_deny(od->od_share_deny, stp);
3699
3700         update_stateid(&stp->st_stid.sc_stateid);
3701         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3702         status = nfs_ok;
3703 out:
3704         if (!cstate->replay_owner)
3705                 nfs4_unlock_state();
3706         return status;
3707 }
3708
3709 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3710 {
3711         struct nfs4_openowner *oo;
3712         struct nfs4_ol_stateid *s;
3713
3714         if (!so->so_is_open_owner)
3715                 return;
3716         oo = openowner(so);
3717         s = oo->oo_last_closed_stid;
3718         if (!s)
3719                 return;
3720         if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3721                 /* Release the last_closed_stid on the next seqid bump: */
3722                 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3723                 return;
3724         }
3725         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3726         release_last_closed_stateid(oo);
3727 }
3728
3729 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3730 {
3731         unhash_open_stateid(s);
3732         s->st_stid.sc_type = NFS4_CLOSED_STID;
3733 }
3734
3735 /*
3736  * nfs4_unlock_state() called after encode
3737  */
3738 __be32
3739 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3740             struct nfsd4_close *close)
3741 {
3742         __be32 status;
3743         struct nfs4_openowner *oo;
3744         struct nfs4_ol_stateid *stp;
3745
3746         dprintk("NFSD: nfsd4_close on file %.*s\n",
3747                         (int)cstate->current_fh.fh_dentry->d_name.len,
3748                         cstate->current_fh.fh_dentry->d_name.name);
3749
3750         nfs4_lock_state();
3751         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3752                                         &close->cl_stateid,
3753                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3754                                         &stp);
3755         if (status)
3756                 goto out;
3757         oo = openowner(stp->st_stateowner);
3758         status = nfs_ok;
3759         update_stateid(&stp->st_stid.sc_stateid);
3760         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3761
3762         nfsd4_close_open_stateid(stp);
3763         oo->oo_last_closed_stid = stp;
3764
3765         /* place unused nfs4_stateowners on so_close_lru list to be
3766          * released by the laundromat service after the lease period
3767          * to enable us to handle CLOSE replay
3768          */
3769         if (list_empty(&oo->oo_owner.so_stateids))
3770                 move_to_close_lru(oo);
3771 out:
3772         if (!cstate->replay_owner)
3773                 nfs4_unlock_state();
3774         return status;
3775 }
3776
3777 __be32
3778 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3779                   struct nfsd4_delegreturn *dr)
3780 {
3781         struct nfs4_delegation *dp;
3782         stateid_t *stateid = &dr->dr_stateid;
3783         struct nfs4_stid *s;
3784         struct inode *inode;
3785         __be32 status;
3786
3787         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3788                 return status;
3789         inode = cstate->current_fh.fh_dentry->d_inode;
3790
3791         nfs4_lock_state();
3792         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
3793         if (status)
3794                 goto out;
3795         dp = delegstateid(s);
3796         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3797         if (status)
3798                 goto out;
3799
3800         unhash_delegation(dp);
3801 out:
3802         nfs4_unlock_state();
3803
3804         return status;
3805 }
3806
3807
3808 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
3809
3810 #define LOCKOWNER_INO_HASH_BITS 8
3811 #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3812 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3813
3814 static inline u64
3815 end_offset(u64 start, u64 len)
3816 {
3817         u64 end;
3818
3819         end = start + len;
3820         return end >= start ? end: NFS4_MAX_UINT64;
3821 }
3822
3823 /* last octet in a range */
3824 static inline u64
3825 last_byte_offset(u64 start, u64 len)
3826 {
3827         u64 end;
3828
3829         BUG_ON(!len);
3830         end = start + len;
3831         return end > start ? end - 1: NFS4_MAX_UINT64;
3832 }
3833
3834 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3835 {
3836         return (file_hashval(inode) + cl_id
3837                         + opaque_hashval(ownername->data, ownername->len))
3838                 & LOCKOWNER_INO_HASH_MASK;
3839 }
3840
3841 static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
3842
3843 /*
3844  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3845  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3846  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
3847  * locking, this prevents us from being completely protocol-compliant.  The
3848  * real solution to this problem is to start using unsigned file offsets in
3849  * the VFS, but this is a very deep change!
3850  */
3851 static inline void
3852 nfs4_transform_lock_offset(struct file_lock *lock)
3853 {
3854         if (lock->fl_start < 0)
3855                 lock->fl_start = OFFSET_MAX;
3856         if (lock->fl_end < 0)
3857                 lock->fl_end = OFFSET_MAX;
3858 }
3859
3860 /* Hack!: For now, we're defining this just so we can use a pointer to it
3861  * as a unique cookie to identify our (NFSv4's) posix locks. */
3862 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
3863 };
3864
3865 static inline void
3866 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3867 {
3868         struct nfs4_lockowner *lo;
3869
3870         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3871                 lo = (struct nfs4_lockowner *) fl->fl_owner;
3872                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3873                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
3874                 if (!deny->ld_owner.data)
3875                         /* We just don't care that much */
3876                         goto nevermind;
3877                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3878                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3879         } else {
3880 nevermind:
3881                 deny->ld_owner.len = 0;
3882                 deny->ld_owner.data = NULL;
3883                 deny->ld_clientid.cl_boot = 0;
3884                 deny->ld_clientid.cl_id = 0;
3885         }
3886         deny->ld_start = fl->fl_start;
3887         deny->ld_length = NFS4_MAX_UINT64;
3888         if (fl->fl_end != NFS4_MAX_UINT64)
3889                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3890         deny->ld_type = NFS4_READ_LT;
3891         if (fl->fl_type != F_RDLCK)
3892                 deny->ld_type = NFS4_WRITE_LT;
3893 }
3894
3895 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3896 {
3897         struct nfs4_ol_stateid *lst;
3898
3899         if (!same_owner_str(&lo->lo_owner, owner, clid))
3900                 return false;
3901         lst = list_first_entry(&lo->lo_owner.so_stateids,
3902                                struct nfs4_ol_stateid, st_perstateowner);
3903         return lst->st_file->fi_inode == inode;
3904 }
3905
3906 static struct nfs4_lockowner *
3907 find_lockowner_str(struct inode *inode, clientid_t *clid,
3908                 struct xdr_netobj *owner)
3909 {
3910         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3911         struct nfs4_lockowner *lo;
3912
3913         list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3914                 if (same_lockowner_ino(lo, inode, clid, owner))
3915                         return lo;
3916         }
3917         return NULL;
3918 }
3919
3920 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3921 {
3922         struct inode *inode = open_stp->st_file->fi_inode;
3923         unsigned int inohash = lockowner_ino_hashval(inode,
3924                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3925
3926         list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
3927         list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
3928         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3929 }
3930
3931 /*
3932  * Alloc a lock owner structure.
3933  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3934  * occurred.
3935  *
3936  * strhashval = ownerstr_hashval
3937  */
3938
3939 static struct nfs4_lockowner *
3940 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3941         struct nfs4_lockowner *lo;
3942
3943         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
3944         if (!lo)
3945                 return NULL;
3946         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
3947         lo->lo_owner.so_is_open_owner = 0;
3948         /* It is the openowner seqid that will be incremented in encode in the
3949          * case of new lockowners; so increment the lock seqid manually: */
3950         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
3951         hash_lockowner(lo, strhashval, clp, open_stp);
3952         return lo;
3953 }
3954
3955 static struct nfs4_ol_stateid *
3956 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
3957 {
3958         struct nfs4_ol_stateid *stp;
3959         struct nfs4_client *clp = lo->lo_owner.so_client;
3960
3961         stp = nfs4_alloc_stateid(clp);
3962         if (stp == NULL)
3963                 return NULL;
3964         init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
3965         list_add(&stp->st_perfile, &fp->fi_stateids);
3966         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
3967         stp->st_stateowner = &lo->lo_owner;
3968         get_nfs4_file(fp);
3969         stp->st_file = fp;
3970         stp->st_access_bmap = 0;
3971         stp->st_deny_bmap = open_stp->st_deny_bmap;
3972         stp->st_openstp = open_stp;
3973         return stp;
3974 }
3975
3976 static int
3977 check_lock_length(u64 offset, u64 length)
3978 {
3979         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
3980              LOFF_OVERFLOW(offset, length)));
3981 }
3982
3983 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
3984 {
3985         struct nfs4_file *fp = lock_stp->st_file;
3986         int oflag = nfs4_access_to_omode(access);
3987
3988         if (test_access(access, lock_stp))
3989                 return;
3990         nfs4_file_get_access(fp, oflag);
3991         set_access(access, lock_stp);
3992 }
3993
3994 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)
3995 {
3996         struct nfs4_file *fi = ost->st_file;
3997         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
3998         struct nfs4_client *cl = oo->oo_owner.so_client;
3999         struct nfs4_lockowner *lo;
4000         unsigned int strhashval;
4001
4002         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
4003         if (lo) {
4004                 if (!cstate->minorversion)
4005                         return nfserr_bad_seqid;
4006                 /* XXX: a lockowner always has exactly one stateid: */
4007                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4008                                 struct nfs4_ol_stateid, st_perstateowner);
4009                 return nfs_ok;
4010         }
4011         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4012                         &lock->v.new.owner);
4013         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4014         if (lo == NULL)
4015                 return nfserr_jukebox;
4016         *lst = alloc_init_lock_stateid(lo, fi, ost);
4017         if (*lst == NULL) {
4018                 release_lockowner(lo);
4019                 return nfserr_jukebox;
4020         }
4021         *new = true;
4022         return nfs_ok;
4023 }
4024
4025 /*
4026  *  LOCK operation
4027  */
4028 __be32
4029 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4030            struct nfsd4_lock *lock)
4031 {
4032         struct nfs4_openowner *open_sop = NULL;
4033         struct nfs4_lockowner *lock_sop = NULL;
4034         struct nfs4_ol_stateid *lock_stp;
4035         struct file *filp = NULL;
4036         struct file_lock file_lock;
4037         struct file_lock conflock;
4038         __be32 status = 0;
4039         bool new_state = false;
4040         int lkflg;
4041         int err;
4042
4043         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4044                 (long long) lock->lk_offset,
4045                 (long long) lock->lk_length);
4046
4047         if (check_lock_length(lock->lk_offset, lock->lk_length))
4048                  return nfserr_inval;
4049
4050         if ((status = fh_verify(rqstp, &cstate->current_fh,
4051                                 S_IFREG, NFSD_MAY_LOCK))) {
4052                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4053                 return status;
4054         }
4055
4056         nfs4_lock_state();
4057
4058         if (lock->lk_is_new) {
4059                 /*
4060                  * Client indicates that this is a new lockowner.
4061                  * Use open owner and open stateid to create lock owner and
4062                  * lock stateid.
4063                  */
4064                 struct nfs4_ol_stateid *open_stp = NULL;
4065
4066                 if (nfsd4_has_session(cstate))
4067                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4068                         memcpy(&lock->v.new.clientid,
4069                                 &cstate->session->se_client->cl_clientid,
4070                                 sizeof(clientid_t));
4071
4072                 status = nfserr_stale_clientid;
4073                 if (STALE_CLIENTID(&lock->lk_new_clientid))
4074                         goto out;
4075
4076                 /* validate and update open stateid and open seqid */
4077                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4078                                         lock->lk_new_open_seqid,
4079                                         &lock->lk_new_open_stateid,
4080                                         &open_stp);
4081                 if (status)
4082                         goto out;
4083                 open_sop = openowner(open_stp->st_stateowner);
4084                 status = nfserr_bad_stateid;
4085                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4086                                                 &lock->v.new.clientid))
4087                         goto out;
4088                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4089                                                         &lock_stp, &new_state);
4090                 if (status)
4091                         goto out;
4092         } else {
4093                 /* lock (lock owner + lock stateid) already exists */
4094                 status = nfs4_preprocess_seqid_op(cstate,
4095                                        lock->lk_old_lock_seqid,
4096                                        &lock->lk_old_lock_stateid,
4097                                        NFS4_LOCK_STID, &lock_stp);
4098                 if (status)
4099                         goto out;
4100         }
4101         lock_sop = lockowner(lock_stp->st_stateowner);
4102
4103         lkflg = setlkflg(lock->lk_type);
4104         status = nfs4_check_openmode(lock_stp, lkflg);
4105         if (status)
4106                 goto out;
4107
4108         status = nfserr_grace;
4109         if (locks_in_grace() && !lock->lk_reclaim)
4110                 goto out;
4111         status = nfserr_no_grace;
4112         if (!locks_in_grace() && lock->lk_reclaim)
4113                 goto out;
4114
4115         locks_init_lock(&file_lock);
4116         switch (lock->lk_type) {
4117                 case NFS4_READ_LT:
4118                 case NFS4_READW_LT:
4119                         filp = find_readable_file(lock_stp->st_file);
4120                         if (filp)
4121                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4122                         file_lock.fl_type = F_RDLCK;
4123                         break;
4124                 case NFS4_WRITE_LT:
4125                 case NFS4_WRITEW_LT:
4126                         filp = find_writeable_file(lock_stp->st_file);
4127                         if (filp)
4128                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4129                         file_lock.fl_type = F_WRLCK;
4130                         break;
4131                 default:
4132                         status = nfserr_inval;
4133                 goto out;
4134         }
4135         if (!filp) {
4136                 status = nfserr_openmode;
4137                 goto out;
4138         }
4139         file_lock.fl_owner = (fl_owner_t)lock_sop;
4140         file_lock.fl_pid = current->tgid;
4141         file_lock.fl_file = filp;
4142         file_lock.fl_flags = FL_POSIX;
4143         file_lock.fl_lmops = &nfsd_posix_mng_ops;
4144
4145         file_lock.fl_start = lock->lk_offset;
4146         file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4147         nfs4_transform_lock_offset(&file_lock);
4148
4149         /*
4150         * Try to lock the file in the VFS.
4151         * Note: locks.c uses the BKL to protect the inode's lock list.
4152         */
4153
4154         err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock);
4155         switch (-err) {
4156         case 0: /* success! */
4157                 update_stateid(&lock_stp->st_stid.sc_stateid);
4158                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4159                                 sizeof(stateid_t));
4160                 status = 0;
4161                 break;
4162         case (EAGAIN):          /* conflock holds conflicting lock */
4163                 status = nfserr_denied;
4164                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4165                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
4166                 break;
4167         case (EDEADLK):
4168                 status = nfserr_deadlock;
4169                 break;
4170         default:
4171                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4172                 status = nfserrno(err);
4173                 break;
4174         }
4175 out:
4176         if (status && new_state)
4177                 release_lockowner(lock_sop);
4178         if (!cstate->replay_owner)
4179                 nfs4_unlock_state();
4180         return status;
4181 }
4182
4183 /*
4184  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4185  * so we do a temporary open here just to get an open file to pass to
4186  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4187  * inode operation.)
4188  */
4189 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4190 {
4191         struct file *file;
4192         int err;
4193
4194         err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4195         if (err)
4196                 return err;
4197         err = vfs_test_lock(file, lock);
4198         nfsd_close(file);
4199         return err;
4200 }
4201
4202 /*
4203  * LOCKT operation
4204  */
4205 __be32
4206 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4207             struct nfsd4_lockt *lockt)
4208 {
4209         struct inode *inode;
4210         struct file_lock file_lock;
4211         struct nfs4_lockowner *lo;
4212         int error;
4213         __be32 status;
4214
4215         if (locks_in_grace())
4216                 return nfserr_grace;
4217
4218         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4219                  return nfserr_inval;
4220
4221         nfs4_lock_state();
4222
4223         status = nfserr_stale_clientid;
4224         if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
4225                 goto out;
4226
4227         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4228                 goto out;
4229
4230         inode = cstate->current_fh.fh_dentry->d_inode;
4231         locks_init_lock(&file_lock);
4232         switch (lockt->lt_type) {
4233                 case NFS4_READ_LT:
4234                 case NFS4_READW_LT:
4235                         file_lock.fl_type = F_RDLCK;
4236                 break;
4237                 case NFS4_WRITE_LT:
4238                 case NFS4_WRITEW_LT:
4239                         file_lock.fl_type = F_WRLCK;
4240                 break;
4241                 default:
4242                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4243                         status = nfserr_inval;
4244                 goto out;
4245         }
4246
4247         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4248         if (lo)
4249                 file_lock.fl_owner = (fl_owner_t)lo;
4250         file_lock.fl_pid = current->tgid;
4251         file_lock.fl_flags = FL_POSIX;
4252
4253         file_lock.fl_start = lockt->lt_offset;
4254         file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4255
4256         nfs4_transform_lock_offset(&file_lock);
4257
4258         status = nfs_ok;
4259         error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
4260         if (error) {
4261                 status = nfserrno(error);
4262                 goto out;
4263         }
4264         if (file_lock.fl_type != F_UNLCK) {
4265                 status = nfserr_denied;
4266                 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
4267         }
4268 out:
4269         nfs4_unlock_state();
4270         return status;
4271 }
4272
4273 __be32
4274 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4275             struct nfsd4_locku *locku)
4276 {
4277         struct nfs4_ol_stateid *stp;
4278         struct file *filp = NULL;
4279         struct file_lock file_lock;
4280         __be32 status;
4281         int err;
4282
4283         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4284                 (long long) locku->lu_offset,
4285                 (long long) locku->lu_length);
4286
4287         if (check_lock_length(locku->lu_offset, locku->lu_length))
4288                  return nfserr_inval;
4289
4290         nfs4_lock_state();
4291
4292         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4293                                         &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4294         if (status)
4295                 goto out;
4296         filp = find_any_file(stp->st_file);
4297         if (!filp) {
4298                 status = nfserr_lock_range;
4299                 goto out;
4300         }
4301         BUG_ON(!filp);
4302         locks_init_lock(&file_lock);
4303         file_lock.fl_type = F_UNLCK;
4304         file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4305         file_lock.fl_pid = current->tgid;
4306         file_lock.fl_file = filp;
4307         file_lock.fl_flags = FL_POSIX;
4308         file_lock.fl_lmops = &nfsd_posix_mng_ops;
4309         file_lock.fl_start = locku->lu_offset;
4310
4311         file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
4312         nfs4_transform_lock_offset(&file_lock);
4313
4314         /*
4315         *  Try to unlock the file in the VFS.
4316         */
4317         err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
4318         if (err) {
4319                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4320                 goto out_nfserr;
4321         }
4322         /*
4323         * OK, unlock succeeded; the only thing left to do is update the stateid.
4324         */
4325         update_stateid(&stp->st_stid.sc_stateid);
4326         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4327
4328 out:
4329         if (!cstate->replay_owner)
4330                 nfs4_unlock_state();
4331         return status;
4332
4333 out_nfserr:
4334         status = nfserrno(err);
4335         goto out;
4336 }
4337
4338 /*
4339  * returns
4340  *      1: locks held by lockowner
4341  *      0: no locks held by lockowner
4342  */
4343 static int
4344 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4345 {
4346         struct file_lock **flpp;
4347         struct inode *inode = filp->fi_inode;
4348         int status = 0;
4349
4350         lock_flocks();
4351         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4352                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4353                         status = 1;
4354                         goto out;
4355                 }
4356         }
4357 out:
4358         unlock_flocks();
4359         return status;
4360 }
4361
4362 __be32
4363 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4364                         struct nfsd4_compound_state *cstate,
4365                         struct nfsd4_release_lockowner *rlockowner)
4366 {
4367         clientid_t *clid = &rlockowner->rl_clientid;
4368         struct nfs4_stateowner *sop;
4369         struct nfs4_lockowner *lo;
4370         struct nfs4_ol_stateid *stp;
4371         struct xdr_netobj *owner = &rlockowner->rl_owner;
4372         struct list_head matches;
4373         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4374         __be32 status;
4375
4376         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4377                 clid->cl_boot, clid->cl_id);
4378
4379         /* XXX check for lease expiration */
4380
4381         status = nfserr_stale_clientid;
4382         if (STALE_CLIENTID(clid))
4383                 return status;
4384
4385         nfs4_lock_state();
4386
4387         status = nfserr_locks_held;
4388         INIT_LIST_HEAD(&matches);
4389
4390         list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
4391                 if (sop->so_is_open_owner)
4392                         continue;
4393                 if (!same_owner_str(sop, owner, clid))
4394                         continue;
4395                 list_for_each_entry(stp, &sop->so_stateids,
4396                                 st_perstateowner) {
4397                         lo = lockowner(sop);
4398                         if (check_for_locks(stp->st_file, lo))
4399                                 goto out;
4400                         list_add(&lo->lo_list, &matches);
4401                 }
4402         }
4403         /* Clients probably won't expect us to return with some (but not all)
4404          * of the lockowner state released; so don't release any until all
4405          * have been checked. */
4406         status = nfs_ok;
4407         while (!list_empty(&matches)) {
4408                 lo = list_entry(matches.next, struct nfs4_lockowner,
4409                                                                 lo_list);
4410                 /* unhash_stateowner deletes so_perclient only
4411                  * for openowners. */
4412                 list_del(&lo->lo_list);
4413                 release_lockowner(lo);
4414         }
4415 out:
4416         nfs4_unlock_state();
4417         return status;
4418 }
4419
4420 static inline struct nfs4_client_reclaim *
4421 alloc_reclaim(void)
4422 {
4423         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4424 }
4425
4426 int
4427 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4428 {
4429         unsigned int strhashval = clientstr_hashval(name);
4430         struct nfs4_client *clp;
4431
4432         clp = find_confirmed_client_by_str(name, strhashval);
4433         if (!clp)
4434                 return 0;
4435         return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
4436 }
4437
4438 /*
4439  * failure => all reset bets are off, nfserr_no_grace...
4440  */
4441 int
4442 nfs4_client_to_reclaim(const char *name)
4443 {
4444         unsigned int strhashval;
4445         struct nfs4_client_reclaim *crp = NULL;
4446
4447         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4448         crp = alloc_reclaim();
4449         if (!crp)
4450                 return 0;
4451         strhashval = clientstr_hashval(name);
4452         INIT_LIST_HEAD(&crp->cr_strhash);
4453         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4454         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4455         reclaim_str_hashtbl_size++;
4456         return 1;
4457 }
4458
4459 void
4460 nfs4_release_reclaim(void)
4461 {
4462         struct nfs4_client_reclaim *crp = NULL;
4463         int i;
4464
4465         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4466                 while (!list_empty(&reclaim_str_hashtbl[i])) {
4467                         crp = list_entry(reclaim_str_hashtbl[i].next,
4468                                         struct nfs4_client_reclaim, cr_strhash);
4469                         list_del(&crp->cr_strhash);
4470                         kfree(crp);
4471                         reclaim_str_hashtbl_size--;
4472                 }
4473         }
4474         BUG_ON(reclaim_str_hashtbl_size);
4475 }
4476
4477 /*
4478  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4479 struct nfs4_client_reclaim *
4480 nfsd4_find_reclaim_client(struct nfs4_client *clp)
4481 {
4482         unsigned int strhashval;
4483         struct nfs4_client_reclaim *crp = NULL;
4484
4485         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4486                             clp->cl_name.len, clp->cl_name.data,
4487                             clp->cl_recdir);
4488
4489         /* find clp->cl_name in reclaim_str_hashtbl */
4490         strhashval = clientstr_hashval(clp->cl_recdir);
4491         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4492                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4493                         return crp;
4494                 }
4495         }
4496         return NULL;
4497 }
4498
4499 /*
4500 * Called from OPEN. Look for clientid in reclaim list.
4501 */
4502 __be32
4503 nfs4_check_open_reclaim(clientid_t *clid)
4504 {
4505         struct nfs4_client *clp;
4506
4507         /* find clientid in conf_id_hashtbl */
4508         clp = find_confirmed_client(clid);
4509         if (clp == NULL)
4510                 return nfserr_reclaim_bad;
4511
4512         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4513 }
4514
4515 #ifdef CONFIG_NFSD_FAULT_INJECTION
4516
4517 void nfsd_forget_clients(u64 num)
4518 {
4519         struct nfs4_client *clp, *next;
4520         int count = 0;
4521
4522         nfs4_lock_state();
4523         list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
4524                 nfsd4_client_record_remove(clp);
4525                 expire_client(clp);
4526                 if (++count == num)
4527                         break;
4528         }
4529         nfs4_unlock_state();
4530
4531         printk(KERN_INFO "NFSD: Forgot %d clients", count);
4532 }
4533
4534 static void release_lockowner_sop(struct nfs4_stateowner *sop)
4535 {
4536         release_lockowner(lockowner(sop));
4537 }
4538
4539 static void release_openowner_sop(struct nfs4_stateowner *sop)
4540 {
4541         release_openowner(openowner(sop));
4542 }
4543
4544 static int nfsd_release_n_owners(u64 num, bool is_open_owner,
4545                                 void (*release_sop)(struct nfs4_stateowner *))
4546 {
4547         int i, count = 0;
4548         struct nfs4_stateowner *sop, *next;
4549
4550         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4551                 list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
4552                         if (sop->so_is_open_owner != is_open_owner)
4553                                 continue;
4554                         release_sop(sop);
4555                         if (++count == num)
4556                                 return count;
4557                 }
4558         }
4559         return count;
4560 }
4561
4562 void nfsd_forget_locks(u64 num)
4563 {
4564         int count;
4565
4566         nfs4_lock_state();
4567         count = nfsd_release_n_owners(num, false, release_lockowner_sop);
4568         nfs4_unlock_state();
4569
4570         printk(KERN_INFO "NFSD: Forgot %d locks", count);
4571 }
4572
4573 void nfsd_forget_openowners(u64 num)
4574 {
4575         int count;
4576
4577         nfs4_lock_state();
4578         count = nfsd_release_n_owners(num, true, release_openowner_sop);
4579         nfs4_unlock_state();
4580
4581         printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4582 }
4583
4584 int nfsd_process_n_delegations(u64 num, void (*deleg_func)(struct nfs4_delegation *))
4585 {
4586         int i, count = 0;
4587         struct nfs4_file *fp, *fnext;
4588         struct nfs4_delegation *dp, *dnext;
4589
4590         for (i = 0; i < FILE_HASH_SIZE; i++) {
4591                 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4592                         list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
4593                                 deleg_func(dp);
4594                                 if (++count == num)
4595                                         return count;
4596                         }
4597                 }
4598         }
4599
4600         return count;
4601 }
4602
4603 void nfsd_forget_delegations(u64 num)
4604 {
4605         unsigned int count;
4606
4607         nfs4_lock_state();
4608         count = nfsd_process_n_delegations(num, unhash_delegation);
4609         nfs4_unlock_state();
4610
4611         printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4612 }
4613
4614 void nfsd_recall_delegations(u64 num)
4615 {
4616         unsigned int count;
4617
4618         nfs4_lock_state();
4619         spin_lock(&recall_lock);
4620         count = nfsd_process_n_delegations(num, nfsd_break_one_deleg);
4621         spin_unlock(&recall_lock);
4622         nfs4_unlock_state();
4623
4624         printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4625 }
4626
4627 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4628
4629 /* initialization to perform at module load time: */
4630
4631 void
4632 nfs4_state_init(void)
4633 {
4634         int i;
4635
4636         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4637                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4638                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4639                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4640                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4641                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4642         }
4643         for (i = 0; i < SESSION_HASH_SIZE; i++)
4644                 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4645         for (i = 0; i < FILE_HASH_SIZE; i++) {
4646                 INIT_LIST_HEAD(&file_hashtbl[i]);
4647         }
4648         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4649                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4650         }
4651         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4652                 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
4653         INIT_LIST_HEAD(&close_lru);
4654         INIT_LIST_HEAD(&client_lru);
4655         INIT_LIST_HEAD(&del_recall_lru);
4656         reclaim_str_hashtbl_size = 0;
4657 }
4658
4659 /*
4660  * Since the lifetime of a delegation isn't limited to that of an open, a
4661  * client may quite reasonably hang on to a delegation as long as it has
4662  * the inode cached.  This becomes an obvious problem the first time a
4663  * client's inode cache approaches the size of the server's total memory.
4664  *
4665  * For now we avoid this problem by imposing a hard limit on the number
4666  * of delegations, which varies according to the server's memory size.
4667  */
4668 static void
4669 set_max_delegations(void)
4670 {
4671         /*
4672          * Allow at most 4 delegations per megabyte of RAM.  Quick
4673          * estimates suggest that in the worst case (where every delegation
4674          * is for a different inode), a delegation could take about 1.5K,
4675          * giving a worst case usage of about 6% of memory.
4676          */
4677         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4678 }
4679
4680 /* initialization to perform when the nfsd service is started: */
4681
4682 int
4683 nfs4_state_start(void)
4684 {
4685         int ret;
4686
4687         /*
4688          * FIXME: For now, we hang most of the pernet global stuff off of
4689          * init_net until nfsd is fully containerized. Eventually, we'll
4690          * need to pass a net pointer into this function, take a reference
4691          * to that instead and then do most of the rest of this on a per-net
4692          * basis.
4693          */
4694         get_net(&init_net);
4695         nfsd4_client_tracking_init(&init_net);
4696         boot_time = get_seconds();
4697         locks_start_grace(&nfsd4_manager);
4698         grace_ended = false;
4699         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4700                nfsd4_grace);
4701         ret = set_callback_cred();
4702         if (ret) {
4703                 ret = -ENOMEM;
4704                 goto out_recovery;
4705         }
4706         laundry_wq = create_singlethread_workqueue("nfsd4");
4707         if (laundry_wq == NULL) {
4708                 ret = -ENOMEM;
4709                 goto out_recovery;
4710         }
4711         ret = nfsd4_create_callback_queue();
4712         if (ret)
4713                 goto out_free_laundry;
4714         queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4715         set_max_delegations();
4716         return 0;
4717 out_free_laundry:
4718         destroy_workqueue(laundry_wq);
4719 out_recovery:
4720         nfsd4_client_tracking_exit(&init_net);
4721         put_net(&init_net);
4722         return ret;
4723 }
4724
4725 static void
4726 __nfs4_state_shutdown(void)
4727 {
4728         int i;
4729         struct nfs4_client *clp = NULL;
4730         struct nfs4_delegation *dp = NULL;
4731         struct list_head *pos, *next, reaplist;
4732
4733         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4734                 while (!list_empty(&conf_id_hashtbl[i])) {
4735                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4736                         expire_client(clp);
4737                 }
4738                 while (!list_empty(&unconf_str_hashtbl[i])) {
4739                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4740                         expire_client(clp);
4741                 }
4742         }
4743         INIT_LIST_HEAD(&reaplist);
4744         spin_lock(&recall_lock);
4745         list_for_each_safe(pos, next, &del_recall_lru) {
4746                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4747                 list_move(&dp->dl_recall_lru, &reaplist);
4748         }
4749         spin_unlock(&recall_lock);
4750         list_for_each_safe(pos, next, &reaplist) {
4751                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4752                 unhash_delegation(dp);
4753         }
4754
4755         nfsd4_client_tracking_exit(&init_net);
4756         put_net(&init_net);
4757 }
4758
4759 void
4760 nfs4_state_shutdown(void)
4761 {
4762         cancel_delayed_work_sync(&laundromat_work);
4763         destroy_workqueue(laundry_wq);
4764         locks_end_grace(&nfsd4_manager);
4765         nfs4_lock_state();
4766         __nfs4_state_shutdown();
4767         nfs4_unlock_state();
4768         nfsd4_destroy_callback_queue();
4769 }
4770
4771 static void
4772 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4773 {
4774         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4775                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4776 }
4777
4778 static void
4779 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4780 {
4781         if (cstate->minorversion) {
4782                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4783                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4784         }
4785 }
4786
4787 void
4788 clear_current_stateid(struct nfsd4_compound_state *cstate)
4789 {
4790         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4791 }
4792
4793 /*
4794  * functions to set current state id
4795  */
4796 void
4797 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4798 {
4799         put_stateid(cstate, &odp->od_stateid);
4800 }
4801
4802 void
4803 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4804 {
4805         put_stateid(cstate, &open->op_stateid);
4806 }
4807
4808 void
4809 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4810 {
4811         put_stateid(cstate, &close->cl_stateid);
4812 }
4813
4814 void
4815 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4816 {
4817         put_stateid(cstate, &lock->lk_resp_stateid);
4818 }
4819
4820 /*
4821  * functions to consume current state id
4822  */
4823
4824 void
4825 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4826 {
4827         get_stateid(cstate, &odp->od_stateid);
4828 }
4829
4830 void
4831 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4832 {
4833         get_stateid(cstate, &drp->dr_stateid);
4834 }
4835
4836 void
4837 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4838 {
4839         get_stateid(cstate, &fsp->fr_stateid);
4840 }
4841
4842 void
4843 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4844 {
4845         get_stateid(cstate, &setattr->sa_stateid);
4846 }
4847
4848 void
4849 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4850 {
4851         get_stateid(cstate, &close->cl_stateid);
4852 }
4853
4854 void
4855 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
4856 {
4857         get_stateid(cstate, &locku->lu_stateid);
4858 }
4859
4860 void
4861 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
4862 {
4863         get_stateid(cstate, &read->rd_stateid);
4864 }
4865
4866 void
4867 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
4868 {
4869         get_stateid(cstate, &write->wr_stateid);
4870 }