fs/nfsd/state.h

   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 <andros@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 #ifndef _NFSD4_STATE_H
  36 #define _NFSD4_STATE_H
  37
  38 #include <linux/sunrpc/svc_xprt.h>
  39 #include <linux/nfsd/nfsfh.h>
  40 #include "nfsfh.h"
  41
  42 typedef struct {
  43         u32             cl_boot;
  44         u32             cl_id;
  45 } clientid_t;
  46
  47 typedef struct {
  48         u32             so_boot;
  49         u32             so_stateownerid;
  50         u32             so_fileid;
  51 } stateid_opaque_t;
  52
  53 typedef struct {
  54         u32                     si_generation;
  55         stateid_opaque_t        si_opaque;
  56 } stateid_t;
  57 #define si_boot           si_opaque.so_boot
  58 #define si_stateownerid   si_opaque.so_stateownerid
  59 #define si_fileid         si_opaque.so_fileid
  60
  61 #define STATEID_FMT     "(%08x/%08x/%08x/%08x)"
  62 #define STATEID_VAL(s) \
  63         (s)->si_boot, \
  64         (s)->si_stateownerid, \
  65         (s)->si_fileid, \
  66         (s)->si_generation
  67
  68 struct nfsd4_callback {
  69         void *cb_op;
  70         struct nfs4_client *cb_clp;
  71         struct list_head cb_per_client;
  72         u32 cb_minorversion;
  73         struct rpc_message cb_msg;
  74         const struct rpc_call_ops *cb_ops;
  75         struct work_struct cb_work;
  76         bool cb_done;
  77 };
  78
  79 struct nfs4_delegation {
  80         struct list_head        dl_perfile;
  81         struct list_head        dl_perclnt;
  82         struct list_head        dl_recall_lru;  /* delegation recalled */
  83         atomic_t                dl_count;       /* ref count */
  84         struct nfs4_client      *dl_client;
  85         struct nfs4_file        *dl_file;
  86         struct file             *dl_vfs_file;
  87         struct file_lock        *dl_flock;
  88         u32                     dl_type;
  89         time_t                  dl_time;
  90 /* For recall: */
  91         stateid_t               dl_stateid;
  92         struct knfsd_fh         dl_fh;
  93         int                     dl_retries;
  94         struct nfsd4_callback   dl_recall;
  95 };
  96
  97 /* client delegation callback info */
  98 struct nfs4_cb_conn {
  99         /* SETCLIENTID info */
 100         struct sockaddr_storage cb_addr;
 101         struct sockaddr_storage cb_saddr;
 102         size_t                  cb_addrlen;
 103         u32                     cb_prog; /* used only in 4.0 case;
 104                                             per-session otherwise */
 105         u32                     cb_ident;       /* minorversion 0 only */
 106         struct svc_xprt         *cb_xprt;       /* minorversion 1 only */
 107 };
 108
 109 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 110 #define NFSD_MAX_SLOTS_PER_SESSION     160
 111 /* Maximum number of operations per session compound */
 112 #define NFSD_MAX_OPS_PER_COMPOUND       16
 113 /* Maximum  session per slot cache size */
 114 #define NFSD_SLOT_CACHE_SIZE            1024
 115 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 116 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION       32
 117 #define NFSD_MAX_MEM_PER_SESSION  \
 118                 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 119
 120 struct nfsd4_slot {
 121         bool    sl_inuse;
 122         bool    sl_cachethis;
 123         u16     sl_opcnt;
 124         u32     sl_seqid;
 125         __be32  sl_status;
 126         u32     sl_datalen;
 127         char    sl_data[];
 128 };
 129
 130 struct nfsd4_channel_attrs {
 131         u32             headerpadsz;
 132         u32             maxreq_sz;
 133         u32             maxresp_sz;
 134         u32             maxresp_cached;
 135         u32             maxops;
 136         u32             maxreqs;
 137         u32             nr_rdma_attrs;
 138         u32             rdma_attrs;
 139 };
 140
 141 struct nfsd4_create_session {
 142         clientid_t                      clientid;
 143         struct nfs4_sessionid           sessionid;
 144         u32                             seqid;
 145         u32                             flags;
 146         struct nfsd4_channel_attrs      fore_channel;
 147         struct nfsd4_channel_attrs      back_channel;
 148         u32                             callback_prog;
 149         u32                             uid;
 150         u32                             gid;
 151 };
 152
 153 struct nfsd4_bind_conn_to_session {
 154         struct nfs4_sessionid           sessionid;
 155         u32                             dir;
 156 };
 157
 158 /* The single slot clientid cache structure */
 159 struct nfsd4_clid_slot {
 160         u32                             sl_seqid;
 161         __be32                          sl_status;
 162         struct nfsd4_create_session     sl_cr_ses;
 163 };
 164
 165 struct nfsd4_conn {
 166         struct list_head cn_persession;
 167         struct svc_xprt *cn_xprt;
 168         struct svc_xpt_user cn_xpt_user;
 169         struct nfsd4_session *cn_session;
 170 /* CDFC4_FORE, CDFC4_BACK: */
 171         unsigned char cn_flags;
 172 };
 173
 174 struct nfsd4_session {
 175         struct kref             se_ref;
 176         struct list_head        se_hash;        /* hash by sessionid */
 177         struct list_head        se_perclnt;
 178         u32                     se_flags;
 179         struct nfs4_client      *se_client;
 180         struct nfs4_sessionid   se_sessionid;
 181         struct nfsd4_channel_attrs se_fchannel;
 182         struct nfsd4_channel_attrs se_bchannel;
 183         struct list_head        se_conns;
 184         u32                     se_cb_prog;
 185         u32                     se_cb_seq_nr;
 186         struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 187 };
 188
 189 static inline void
 190 nfsd4_put_session(struct nfsd4_session *ses)
 191 {
 192         extern void free_session(struct kref *kref);
 193         kref_put(&ses->se_ref, free_session);
 194 }
 195
 196 static inline void
 197 nfsd4_get_session(struct nfsd4_session *ses)
 198 {
 199         kref_get(&ses->se_ref);
 200 }
 201
 202 /* formatted contents of nfs4_sessionid */
 203 struct nfsd4_sessionid {
 204         clientid_t      clientid;
 205         u32             sequence;
 206         u32             reserved;
 207 };
 208
 209 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 210
 211 /*
 212  * struct nfs4_client - one per client.  Clientids live here.
 213  *      o Each nfs4_client is hashed by clientid.
 214  *
 215  *      o Each nfs4_clients is also hashed by name
 216  *        (the opaque quantity initially sent by the client to identify itself).
 217  *
 218  *      o cl_perclient list is used to ensure no dangling stateowner references
 219  *        when we expire the nfs4_client
 220  */
 221 struct nfs4_client {
 222         struct list_head        cl_idhash;      /* hash by cl_clientid.id */
 223         struct list_head        cl_strhash;     /* hash by cl_name */
 224         struct list_head        cl_openowners;
 225         struct list_head        cl_delegations;
 226         struct list_head        cl_lru;         /* tail queue */
 227         struct xdr_netobj       cl_name;        /* id generated by client */
 228         char                    cl_recdir[HEXDIR_LEN]; /* recovery dir */
 229         nfs4_verifier           cl_verifier;    /* generated by client */
 230         time_t                  cl_time;        /* time of last lease renewal */
 231         struct sockaddr_storage cl_addr;        /* client ipaddress */
 232         u32                     cl_flavor;      /* setclientid pseudoflavor */
 233         char                    *cl_principal;  /* setclientid principal name */
 234         struct svc_cred         cl_cred;        /* setclientid principal */
 235         clientid_t              cl_clientid;    /* generated by server */
 236         nfs4_verifier           cl_confirm;     /* generated by server */
 237         u32                     cl_firststate;  /* recovery dir creation */
 238         u32                     cl_minorversion;
 239
 240         /* for v4.0 and v4.1 callbacks: */
 241         struct nfs4_cb_conn     cl_cb_conn;
 242 #define NFSD4_CLIENT_CB_UPDATE  1
 243 #define NFSD4_CLIENT_KILL       2
 244         unsigned long           cl_cb_flags;
 245         struct rpc_clnt         *cl_cb_client;
 246         u32                     cl_cb_ident;
 247 #define NFSD4_CB_UP             0
 248 #define NFSD4_CB_UNKNOWN        1
 249 #define NFSD4_CB_DOWN           2
 250         int                     cl_cb_state;
 251         struct nfsd4_callback   cl_cb_null;
 252         struct nfsd4_session    *cl_cb_session;
 253         struct list_head        cl_callbacks; /* list of in-progress callbacks */
 254
 255         /* for all client information that callback code might need: */
 256         spinlock_t              cl_lock;
 257
 258         /* for nfs41 */
 259         struct list_head        cl_sessions;
 260         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
 261         u32                     cl_exchange_flags;
 262         /* number of rpc's in progress over an associated session: */
 263         atomic_t                cl_refcount;
 264
 265         /* for nfs41 callbacks */
 266         /* We currently support a single back channel with a single slot */
 267         unsigned long           cl_cb_slot_busy;
 268         struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
 269                                                 /* wait here for slots */
 270 };
 271
 272 static inline void
 273 mark_client_expired(struct nfs4_client *clp)
 274 {
 275         clp->cl_time = 0;
 276 }
 277
 278 static inline bool
 279 is_client_expired(struct nfs4_client *clp)
 280 {
 281         return clp->cl_time == 0;
 282 }
 283
 284 /* struct nfs4_client_reset
 285  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 286  * upon lease reset, or from upcall to state_daemon (to read in state
 287  * from non-volitile storage) upon reboot.
 288  */
 289 struct nfs4_client_reclaim {
 290         struct list_head        cr_strhash;     /* hash by cr_name */
 291         char                    cr_recdir[HEXDIR_LEN]; /* recover dir */
 292 };
 293
 294 static inline void
 295 update_stateid(stateid_t *stateid)
 296 {
 297         stateid->si_generation++;
 298 }
 299
 300 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
 301  * The OPEN response, typically the largest, requires
 302  *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) +
 303  *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
 304  *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
 305  */
 306
 307 #define NFSD4_REPLAY_ISIZE       112
 308
 309 /*
 310  * Replay buffer, where the result of the last seqid-mutating operation
 311  * is cached.
 312  */
 313 struct nfs4_replay {
 314         __be32                  rp_status;
 315         unsigned int            rp_buflen;
 316         char                    *rp_buf;
 317         unsigned                intrp_allocated;
 318         struct knfsd_fh         rp_openfh;
 319         char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
 320 };
 321
 322 /*
 323 * nfs4_stateowner can either be an open_owner, or a lock_owner
 324 *
 325 *    so_idhash:  stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
 326 *         for lock_owner
 327 *    so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
 328 *         for lock_owner
 329 *    so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
 330 *         struct is reaped.
 331 *    so_perfilestate: heads the list of nfs4_stateid (either open or lock)
 332 *         and is used to ensure no dangling nfs4_stateid references when we
 333 *         release a stateowner.
 334 *    so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
 335 *         close is called to reap associated byte-range locks
 336 *    so_close_lru: (open) stateowner is placed on this list instead of being
 337 *         reaped (when so_perfilestate is empty) to hold the last close replay.
 338 *         reaped by laundramat thread after lease period.
 339 */
 340 struct nfs4_stateowner {
 341         struct kref             so_ref;
 342         struct list_head        so_idhash;   /* hash by so_id */
 343         struct list_head        so_strhash;   /* hash by op_name */
 344         struct list_head        so_perclient;
 345         struct list_head        so_stateids;
 346         struct list_head        so_perstateid; /* for lockowners only */
 347         struct list_head        so_close_lru; /* tail queue */
 348         time_t                  so_time; /* time of placement on so_close_lru */
 349         int                     so_is_open_owner; /* 1=openowner,0=lockowner */
 350         u32                     so_id;
 351         struct nfs4_client *    so_client;
 352         /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
 353          * sequence id expected from the client: */
 354         u32                     so_seqid;
 355         struct xdr_netobj       so_owner;     /* open owner name */
 356         int                     so_confirmed; /* successful OPEN_CONFIRM? */
 357         struct nfs4_replay      so_replay;
 358 };
 359
 360 /*
 361 *  nfs4_file: a file opened by some number of (open) nfs4_stateowners.
 362 *    o fi_perfile list is used to search for conflicting
 363 *      share_acces, share_deny on the file.
 364 */
 365 struct nfs4_file {
 366         atomic_t                fi_ref;
 367         struct list_head        fi_hash;    /* hash by "struct inode *" */
 368         struct list_head        fi_stateids;
 369         struct list_head        fi_delegations;
 370         /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
 371         struct file *           fi_fds[3];
 372         /* One each for O_RDONLY, O_WRONLY: */
 373         atomic_t                fi_access[2];
 374         /*
 375          * Each open stateid contributes 1 to either fi_readers or
 376          * fi_writers, or both, depending on the open mode.  A
 377          * delegation also takes an fi_readers reference.  Lock
 378          * stateid's take none.
 379          */
 380         atomic_t                fi_readers;
 381         atomic_t                fi_writers;
 382         struct inode            *fi_inode;
 383         u32                     fi_id;      /* used with stateowner->so_id
 384                                              * for stateid_hashtbl hash */
 385         bool                    fi_had_conflict;
 386 };
 387
 388 /* XXX: for first cut may fall back on returning file that doesn't work
 389  * at all? */
 390 static inline struct file *find_writeable_file(struct nfs4_file *f)
 391 {
 392         if (f->fi_fds[O_WRONLY])
 393                 return f->fi_fds[O_WRONLY];
 394         return f->fi_fds[O_RDWR];
 395 }
 396
 397 static inline struct file *find_readable_file(struct nfs4_file *f)
 398 {
 399         if (f->fi_fds[O_RDONLY])
 400                 return f->fi_fds[O_RDONLY];
 401         return f->fi_fds[O_RDWR];
 402 }
 403
 404 static inline struct file *find_any_file(struct nfs4_file *f)
 405 {
 406         if (f->fi_fds[O_RDWR])
 407                 return f->fi_fds[O_RDWR];
 408         else if (f->fi_fds[O_WRONLY])
 409                 return f->fi_fds[O_WRONLY];
 410         else
 411                 return f->fi_fds[O_RDONLY];
 412 }
 413
 414 /*
 415 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
 416 *
 417 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
 418 *
 419 *       st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
 420 *       st_perfile: file_hashtbl[] entry.
 421 *       st_perfile_state: nfs4_stateowner->so_perfilestate
 422 *       st_perlockowner: (open stateid) list of lock nfs4_stateowners
 423 *       st_access_bmap: used only for open stateid
 424 *       st_deny_bmap: used only for open stateid
 425 *       st_openstp: open stateid lock stateid was derived from
 426 *
 427 * XXX: open stateids and lock stateids have diverged sufficiently that
 428 * we should consider defining separate structs for the two cases.
 429 */
 430
 431 struct nfs4_stateid {
 432         struct list_head              st_hash;
 433         struct list_head              st_perfile;
 434         struct list_head              st_perstateowner;
 435         struct list_head              st_lockowners;
 436         struct nfs4_stateowner      * st_stateowner;
 437         struct nfs4_file            * st_file;
 438         stateid_t                     st_stateid;
 439         unsigned long                 st_access_bmap;
 440         unsigned long                 st_deny_bmap;
 441         struct nfs4_stateid         * st_openstp;
 442 };
 443
 444 /* flags for preprocess_seqid_op() */
 445 #define HAS_SESSION             0x00000001
 446 #define CONFIRM                 0x00000002
 447 #define OPEN_STATE              0x00000004
 448 #define LOCK_STATE              0x00000008
 449 #define RD_STATE                0x00000010
 450 #define WR_STATE                0x00000020
 451 #define CLOSE_STATE             0x00000040
 452
 453 #define seqid_mutating_err(err)                       \
 454         (((err) != nfserr_stale_clientid) &&    \
 455         ((err) != nfserr_bad_seqid) &&          \
 456         ((err) != nfserr_stale_stateid) &&      \
 457         ((err) != nfserr_bad_stateid))
 458
 459 struct nfsd4_compound_state;
 460
 461 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
 462                 stateid_t *stateid, int flags, struct file **filp);
 463 extern void nfs4_lock_state(void);
 464 extern void nfs4_unlock_state(void);
 465 extern int nfs4_in_grace(void);
 466 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
 467 extern void nfs4_free_stateowner(struct kref *kref);
 468 extern int set_callback_cred(void);
 469 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 470 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 471 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 472 extern void nfsd4_do_callback_rpc(struct work_struct *);
 473 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
 474 extern int nfsd4_create_callback_queue(void);
 475 extern void nfsd4_destroy_callback_queue(void);
 476 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 477 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
 478 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
 479 extern void nfsd4_init_recdir(char *recdir_name);
 480 extern int nfsd4_recdir_load(void);
 481 extern void nfsd4_shutdown_recdir(void);
 482 extern int nfs4_client_to_reclaim(const char *name);
 483 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
 484 extern void nfsd4_recdir_purge_old(void);
 485 extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
 486 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
 487 extern void release_session_client(struct nfsd4_session *);
 488
 489 static inline void
 490 nfs4_put_stateowner(struct nfs4_stateowner *so)
 491 {
 492         kref_put(&so->so_ref, nfs4_free_stateowner);
 493 }
 494
 495 static inline void
 496 nfs4_get_stateowner(struct nfs4_stateowner *so)
 497 {
 498         kref_get(&so->so_ref);
 499 }
 500
 501 #endif   /* NFSD4_STATE_H */