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/idr.h>
  39 #include <linux/sunrpc/svc_xprt.h>
  40 #include <linux/nfsd/nfsfh.h>
  41 #include "nfsfh.h"
  42
  43 typedef struct {
  44         u32             cl_boot;
  45         u32             cl_id;
  46 } clientid_t;
  47
  48 typedef struct {
  49         clientid_t      so_clid;
  50         u32             so_id;
  51 } stateid_opaque_t;
  52
  53 typedef struct {
  54         u32                     si_generation;
  55         stateid_opaque_t        si_opaque;
  56 } stateid_t;
  57
  58 #define STATEID_FMT     "(%08x/%08x/%08x/%08x)"
  59 #define STATEID_VAL(s) \
  60         (s)->si_opaque.so_clid.cl_boot, \
  61         (s)->si_opaque.so_clid.cl_id, \
  62         (s)->si_opaque.so_id, \
  63         (s)->si_generation
  64
  65 struct nfsd4_callback {
  66         void *cb_op;
  67         struct nfs4_client *cb_clp;
  68         struct list_head cb_per_client;
  69         u32 cb_minorversion;
  70         struct rpc_message cb_msg;
  71         const struct rpc_call_ops *cb_ops;
  72         struct work_struct cb_work;
  73         bool cb_done;
  74 };
  75
  76 struct nfs4_stid {
  77 #define NFS4_OPEN_STID 1
  78 #define NFS4_LOCK_STID 2
  79 #define NFS4_DELEG_STID 4
  80 /* For an open stateid kept around *only* to process close replays: */
  81 #define NFS4_CLOSED_STID 8
  82         unsigned char sc_type;
  83         stateid_t sc_stateid;
  84         struct nfs4_client *sc_client;
  85 };
  86
  87 struct nfs4_delegation {
  88         struct nfs4_stid        dl_stid; /* must be first field */
  89         struct list_head        dl_perfile;
  90         struct list_head        dl_perclnt;
  91         struct list_head        dl_recall_lru;  /* delegation recalled */
  92         atomic_t                dl_count;       /* ref count */
  93         struct nfs4_file        *dl_file;
  94         u32                     dl_type;
  95         time_t                  dl_time;
  96 /* For recall: */
  97         struct knfsd_fh         dl_fh;
  98         int                     dl_retries;
  99         struct nfsd4_callback   dl_recall;
 100 };
 101
 102 /* client delegation callback info */
 103 struct nfs4_cb_conn {
 104         /* SETCLIENTID info */
 105         struct sockaddr_storage cb_addr;
 106         struct sockaddr_storage cb_saddr;
 107         size_t                  cb_addrlen;
 108         u32                     cb_prog; /* used only in 4.0 case;
 109                                             per-session otherwise */
 110         u32                     cb_ident;       /* minorversion 0 only */
 111         struct svc_xprt         *cb_xprt;       /* minorversion 1 only */
 112 };
 113
 114 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
 115 {
 116         return container_of(s, struct nfs4_delegation, dl_stid);
 117 }
 118
 119 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 120 #define NFSD_MAX_SLOTS_PER_SESSION     160
 121 /* Maximum number of operations per session compound */
 122 #define NFSD_MAX_OPS_PER_COMPOUND       16
 123 /* Maximum  session per slot cache size */
 124 #define NFSD_SLOT_CACHE_SIZE            1024
 125 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 126 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION       32
 127 #define NFSD_MAX_MEM_PER_SESSION  \
 128                 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 129
 130 struct nfsd4_slot {
 131         u32     sl_seqid;
 132         __be32  sl_status;
 133         u32     sl_datalen;
 134         u16     sl_opcnt;
 135 #define NFSD4_SLOT_INUSE        (1 << 0)
 136 #define NFSD4_SLOT_CACHETHIS    (1 << 1)
 137 #define NFSD4_SLOT_INITIALIZED  (1 << 2)
 138         u8      sl_flags;
 139         char    sl_data[];
 140 };
 141
 142 struct nfsd4_channel_attrs {
 143         u32             headerpadsz;
 144         u32             maxreq_sz;
 145         u32             maxresp_sz;
 146         u32             maxresp_cached;
 147         u32             maxops;
 148         u32             maxreqs;
 149         u32             nr_rdma_attrs;
 150         u32             rdma_attrs;
 151 };
 152
 153 struct nfsd4_create_session {
 154         clientid_t                      clientid;
 155         struct nfs4_sessionid           sessionid;
 156         u32                             seqid;
 157         u32                             flags;
 158         struct nfsd4_channel_attrs      fore_channel;
 159         struct nfsd4_channel_attrs      back_channel;
 160         u32                             callback_prog;
 161         u32                             uid;
 162         u32                             gid;
 163 };
 164
 165 struct nfsd4_bind_conn_to_session {
 166         struct nfs4_sessionid           sessionid;
 167         u32                             dir;
 168 };
 169
 170 /* The single slot clientid cache structure */
 171 struct nfsd4_clid_slot {
 172         u32                             sl_seqid;
 173         __be32                          sl_status;
 174         struct nfsd4_create_session     sl_cr_ses;
 175 };
 176
 177 struct nfsd4_conn {
 178         struct list_head cn_persession;
 179         struct svc_xprt *cn_xprt;
 180         struct svc_xpt_user cn_xpt_user;
 181         struct nfsd4_session *cn_session;
 182 /* CDFC4_FORE, CDFC4_BACK: */
 183         unsigned char cn_flags;
 184 };
 185
 186 struct nfsd4_session {
 187         struct kref             se_ref;
 188         struct list_head        se_hash;        /* hash by sessionid */
 189         struct list_head        se_perclnt;
 190         u32                     se_flags;
 191         struct nfs4_client      *se_client;
 192         struct nfs4_sessionid   se_sessionid;
 193         struct nfsd4_channel_attrs se_fchannel;
 194         struct nfsd4_channel_attrs se_bchannel;
 195         struct list_head        se_conns;
 196         u32                     se_cb_prog;
 197         u32                     se_cb_seq_nr;
 198         struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 199 };
 200
 201 extern void nfsd4_put_session(struct nfsd4_session *ses);
 202
 203 /* formatted contents of nfs4_sessionid */
 204 struct nfsd4_sessionid {
 205         clientid_t      clientid;
 206         u32             sequence;
 207         u32             reserved;
 208 };
 209
 210 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 211
 212 /*
 213  * struct nfs4_client - one per client.  Clientids live here.
 214  *      o Each nfs4_client is hashed by clientid.
 215  *
 216  *      o Each nfs4_clients is also hashed by name
 217  *        (the opaque quantity initially sent by the client to identify itself).
 218  *
 219  *      o cl_perclient list is used to ensure no dangling stateowner references
 220  *        when we expire the nfs4_client
 221  */
 222 struct nfs4_client {
 223         struct list_head        cl_idhash;      /* hash by cl_clientid.id */
 224         struct list_head        cl_strhash;     /* hash by cl_name */
 225         struct list_head        cl_openowners;
 226         struct idr              cl_stateids;    /* stateid lookup */
 227         struct list_head        cl_delegations;
 228         struct list_head        cl_lru;         /* tail queue */
 229         struct xdr_netobj       cl_name;        /* id generated by client */
 230         char                    cl_recdir[HEXDIR_LEN]; /* recovery dir */
 231         nfs4_verifier           cl_verifier;    /* generated by client */
 232         time_t                  cl_time;        /* time of last lease renewal */
 233         struct sockaddr_storage cl_addr;        /* client ipaddress */
 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_minorversion;
 238
 239         /* for v4.0 and v4.1 callbacks: */
 240         struct nfs4_cb_conn     cl_cb_conn;
 241 #define NFSD4_CLIENT_CB_UPDATE          (0)
 242 #define NFSD4_CLIENT_CB_KILL            (1)
 243 #define NFSD4_CLIENT_STABLE             (2)     /* client on stable storage */
 244 #define NFSD4_CLIENT_RECLAIM_COMPLETE   (3)     /* reclaim_complete done */
 245 #define NFSD4_CLIENT_CB_FLAG_MASK       (1 << NFSD4_CLIENT_CB_UPDATE | \
 246                                          1 << NFSD4_CLIENT_CB_KILL)
 247         unsigned long           cl_flags;
 248         struct rpc_clnt         *cl_cb_client;
 249         u32                     cl_cb_ident;
 250 #define NFSD4_CB_UP             0
 251 #define NFSD4_CB_UNKNOWN        1
 252 #define NFSD4_CB_DOWN           2
 253 #define NFSD4_CB_FAULT          3
 254         int                     cl_cb_state;
 255         struct nfsd4_callback   cl_cb_null;
 256         struct nfsd4_session    *cl_cb_session;
 257         struct list_head        cl_callbacks; /* list of in-progress callbacks */
 258
 259         /* for all client information that callback code might need: */
 260         spinlock_t              cl_lock;
 261
 262         /* for nfs41 */
 263         struct list_head        cl_sessions;
 264         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
 265         u32                     cl_exchange_flags;
 266         /* number of rpc's in progress over an associated session: */
 267         atomic_t                cl_refcount;
 268
 269         /* for nfs41 callbacks */
 270         /* We currently support a single back channel with a single slot */
 271         unsigned long           cl_cb_slot_busy;
 272         struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
 273                                                 /* wait here for slots */
 274 };
 275
 276 static inline void
 277 mark_client_expired(struct nfs4_client *clp)
 278 {
 279         clp->cl_time = 0;
 280 }
 281
 282 static inline bool
 283 is_client_expired(struct nfs4_client *clp)
 284 {
 285         return clp->cl_time == 0;
 286 }
 287
 288 /* struct nfs4_client_reset
 289  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 290  * upon lease reset, or from upcall to state_daemon (to read in state
 291  * from non-volitile storage) upon reboot.
 292  */
 293 struct nfs4_client_reclaim {
 294         struct list_head        cr_strhash;     /* hash by cr_name */
 295         char                    cr_recdir[HEXDIR_LEN]; /* recover dir */
 296 };
 297
 298 static inline void
 299 update_stateid(stateid_t *stateid)
 300 {
 301         stateid->si_generation++;
 302         /* Wraparound recommendation from 3530bis-13 9.1.3.2: */
 303         if (stateid->si_generation == 0)
 304                 stateid->si_generation = 1;
 305 }
 306
 307 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
 308  * The OPEN response, typically the largest, requires
 309  *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) +
 310  *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
 311  *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
 312  */
 313
 314 #define NFSD4_REPLAY_ISIZE       112
 315
 316 /*
 317  * Replay buffer, where the result of the last seqid-mutating operation
 318  * is cached.
 319  */
 320 struct nfs4_replay {
 321         __be32                  rp_status;
 322         unsigned int            rp_buflen;
 323         char                    *rp_buf;
 324         struct knfsd_fh         rp_openfh;
 325         char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
 326 };
 327
 328 struct nfs4_stateowner {
 329         struct list_head        so_strhash;   /* hash by op_name */
 330         struct list_head        so_stateids;
 331         struct nfs4_client *    so_client;
 332         /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
 333          * sequence id expected from the client: */
 334         u32                     so_seqid;
 335         struct xdr_netobj       so_owner;     /* open owner name */
 336         struct nfs4_replay      so_replay;
 337         bool                    so_is_open_owner;
 338 };
 339
 340 struct nfs4_openowner {
 341         struct nfs4_stateowner  oo_owner; /* must be first field */
 342         struct list_head        oo_perclient;
 343         /*
 344          * We keep around openowners a little while after last close,
 345          * which saves clients from having to confirm, and allows us to
 346          * handle close replays if they come soon enough.  The close_lru
 347          * is a list of such openowners, to be reaped by the laundromat
 348          * thread eventually if they remain unused:
 349          */
 350         struct list_head        oo_close_lru;
 351         struct nfs4_ol_stateid *oo_last_closed_stid;
 352         time_t                  oo_time; /* time of placement on so_close_lru */
 353 #define NFS4_OO_CONFIRMED   1
 354 #define NFS4_OO_PURGE_CLOSE 2
 355 #define NFS4_OO_NEW         4
 356         unsigned char           oo_flags;
 357 };
 358
 359 struct nfs4_lockowner {
 360         struct nfs4_stateowner  lo_owner; /* must be first element */
 361         struct list_head        lo_owner_ino_hash; /* hash by owner,file */
 362         struct list_head        lo_perstateid; /* for lockowners only */
 363         struct list_head        lo_list; /* for temporary uses */
 364 };
 365
 366 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
 367 {
 368         return container_of(so, struct nfs4_openowner, oo_owner);
 369 }
 370
 371 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 372 {
 373         return container_of(so, struct nfs4_lockowner, lo_owner);
 374 }
 375
 376 /* nfs4_file: a file opened by some number of (open) nfs4_stateowners. */
 377 struct nfs4_file {
 378         atomic_t                fi_ref;
 379         struct list_head        fi_hash;    /* hash by "struct inode *" */
 380         struct list_head        fi_stateids;
 381         struct list_head        fi_delegations;
 382         /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
 383         struct file *           fi_fds[3];
 384         /*
 385          * Each open or lock stateid contributes 0-4 to the counts
 386          * below depending on which bits are set in st_access_bitmap:
 387          *     1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
 388          *   + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
 389          *   + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
 390          */
 391         atomic_t                fi_access[2];
 392         struct file             *fi_deleg_file;
 393         struct file_lock        *fi_lease;
 394         atomic_t                fi_delegees;
 395         struct inode            *fi_inode;
 396         bool                    fi_had_conflict;
 397 };
 398
 399 /* XXX: for first cut may fall back on returning file that doesn't work
 400  * at all? */
 401 static inline struct file *find_writeable_file(struct nfs4_file *f)
 402 {
 403         if (f->fi_fds[O_WRONLY])
 404                 return f->fi_fds[O_WRONLY];
 405         return f->fi_fds[O_RDWR];
 406 }
 407
 408 static inline struct file *find_readable_file(struct nfs4_file *f)
 409 {
 410         if (f->fi_fds[O_RDONLY])
 411                 return f->fi_fds[O_RDONLY];
 412         return f->fi_fds[O_RDWR];
 413 }
 414
 415 static inline struct file *find_any_file(struct nfs4_file *f)
 416 {
 417         if (f->fi_fds[O_RDWR])
 418                 return f->fi_fds[O_RDWR];
 419         else if (f->fi_fds[O_WRONLY])
 420                 return f->fi_fds[O_WRONLY];
 421         else
 422                 return f->fi_fds[O_RDONLY];
 423 }
 424
 425 /* "ol" stands for "Open or Lock".  Better suggestions welcome. */
 426 struct nfs4_ol_stateid {
 427         struct nfs4_stid    st_stid; /* must be first field */
 428         struct list_head              st_perfile;
 429         struct list_head              st_perstateowner;
 430         struct list_head              st_lockowners;
 431         struct nfs4_stateowner      * st_stateowner;
 432         struct nfs4_file            * st_file;
 433         unsigned long                 st_access_bmap;
 434         unsigned long                 st_deny_bmap;
 435         struct nfs4_ol_stateid         * st_openstp;
 436 };
 437
 438 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
 439 {
 440         return container_of(s, struct nfs4_ol_stateid, st_stid);
 441 }
 442
 443 /* flags for preprocess_seqid_op() */
 444 #define RD_STATE                0x00000010
 445 #define WR_STATE                0x00000020
 446
 447 struct nfsd4_compound_state;
 448 struct nfsd_net;
 449
 450 extern __be32 nfs4_preprocess_stateid_op(struct net *net,
 451                 struct nfsd4_compound_state *cstate,
 452                 stateid_t *stateid, int flags, struct file **filp);
 453 extern void nfs4_lock_state(void);
 454 extern void nfs4_unlock_state(void);
 455 extern int nfs4_in_grace(void);
 456 extern void nfs4_release_reclaim(void);
 457 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct nfs4_client *crp);
 458 extern __be32 nfs4_check_open_reclaim(clientid_t *clid, bool sessions);
 459 extern void nfs4_free_openowner(struct nfs4_openowner *);
 460 extern void nfs4_free_lockowner(struct nfs4_lockowner *);
 461 extern int set_callback_cred(void);
 462 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 463 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 464 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 465 extern void nfsd4_do_callback_rpc(struct work_struct *);
 466 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
 467 extern int nfsd4_create_callback_queue(void);
 468 extern void nfsd4_destroy_callback_queue(void);
 469 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 470 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
 471 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
 472 extern int nfs4_client_to_reclaim(const char *name);
 473 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
 474 extern void release_session_client(struct nfsd4_session *);
 475 extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);
 476
 477 /* nfs4recover operations */
 478 extern int nfsd4_client_tracking_init(struct net *net);
 479 extern void nfsd4_client_tracking_exit(struct net *net);
 480 extern void nfsd4_client_record_create(struct nfs4_client *clp);
 481 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
 482 extern int nfsd4_client_record_check(struct nfs4_client *clp);
 483 extern void nfsd4_record_grace_done(struct net *net, time_t boot_time);
 484 #endif   /* NFSD4_STATE_H */