root/fs/nfsd/state.h

/* [<][>][^][v][top][bottom][index][help] */

INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. delegstateid
  2. openlockstateid
  3. layoutstateid
  4. nfsd4_stateid_generation_after
  5. get_nfs4_file
  6. nfsd_fault_inject_init
  7. nfsd_fault_inject_cleanup

   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/refcount.h>
  40 #include <linux/sunrpc/svc_xprt.h>
  41 #include "nfsfh.h"
  42 #include "nfsd.h"
  43 
  44 typedef struct {
  45         u32             cl_boot;
  46         u32             cl_id;
  47 } clientid_t;
  48 
  49 typedef struct {
  50         clientid_t      so_clid;
  51         u32             so_id;
  52 } stateid_opaque_t;
  53 
  54 typedef struct {
  55         u32                     si_generation;
  56         stateid_opaque_t        si_opaque;
  57 } stateid_t;
  58 
  59 #define STATEID_FMT     "(%08x/%08x/%08x/%08x)"
  60 #define STATEID_VAL(s) \
  61         (s)->si_opaque.so_clid.cl_boot, \
  62         (s)->si_opaque.so_clid.cl_id, \
  63         (s)->si_opaque.so_id, \
  64         (s)->si_generation
  65 
  66 struct nfsd4_callback {
  67         struct nfs4_client *cb_clp;
  68         struct rpc_message cb_msg;
  69         const struct nfsd4_callback_ops *cb_ops;
  70         struct work_struct cb_work;
  71         int cb_seq_status;
  72         int cb_status;
  73         bool cb_need_restart;
  74         bool cb_holds_slot;
  75 };
  76 
  77 struct nfsd4_callback_ops {
  78         void (*prepare)(struct nfsd4_callback *);
  79         int (*done)(struct nfsd4_callback *, struct rpc_task *);
  80         void (*release)(struct nfsd4_callback *);
  81 };
  82 
  83 /*
  84  * A core object that represents a "common" stateid. These are generally
  85  * embedded within the different (more specific) stateid objects and contain
  86  * fields that are of general use to any stateid.
  87  */
  88 struct nfs4_stid {
  89         refcount_t              sc_count;
  90 #define NFS4_OPEN_STID 1
  91 #define NFS4_LOCK_STID 2
  92 #define NFS4_DELEG_STID 4
  93 /* For an open stateid kept around *only* to process close replays: */
  94 #define NFS4_CLOSED_STID 8
  95 /* For a deleg stateid kept around only to process free_stateid's: */
  96 #define NFS4_REVOKED_DELEG_STID 16
  97 #define NFS4_CLOSED_DELEG_STID 32
  98 #define NFS4_LAYOUT_STID 64
  99         unsigned char           sc_type;
 100         stateid_t               sc_stateid;
 101         spinlock_t              sc_lock;
 102         struct nfs4_client      *sc_client;
 103         struct nfs4_file        *sc_file;
 104         void                    (*sc_free)(struct nfs4_stid *);
 105 };
 106 
 107 /*
 108  * Represents a delegation stateid. The nfs4_client holds references to these
 109  * and they are put when it is being destroyed or when the delegation is
 110  * returned by the client:
 111  *
 112  * o 1 reference as long as a delegation is still in force (taken when it's
 113  *   alloc'd, put when it's returned or revoked)
 114  *
 115  * o 1 reference as long as a recall rpc is in progress (taken when the lease
 116  *   is broken, put when the rpc exits)
 117  *
 118  * o 1 more ephemeral reference for each nfsd thread currently doing something
 119  *   with that delegation without holding the cl_lock
 120  *
 121  * If the server attempts to recall a delegation and the client doesn't do so
 122  * before a timeout, the server may also revoke the delegation. In that case,
 123  * the object will either be destroyed (v4.0) or moved to a per-client list of
 124  * revoked delegations (v4.1+).
 125  *
 126  * This object is a superset of the nfs4_stid.
 127  */
 128 struct nfs4_delegation {
 129         struct nfs4_stid        dl_stid; /* must be first field */
 130         struct list_head        dl_perfile;
 131         struct list_head        dl_perclnt;
 132         struct list_head        dl_recall_lru;  /* delegation recalled */
 133         struct nfs4_clnt_odstate *dl_clnt_odstate;
 134         u32                     dl_type;
 135         time_t                  dl_time;
 136 /* For recall: */
 137         int                     dl_retries;
 138         struct nfsd4_callback   dl_recall;
 139 };
 140 
 141 #define cb_to_delegation(cb) \
 142         container_of(cb, struct nfs4_delegation, dl_recall)
 143 
 144 /* client delegation callback info */
 145 struct nfs4_cb_conn {
 146         /* SETCLIENTID info */
 147         struct sockaddr_storage cb_addr;
 148         struct sockaddr_storage cb_saddr;
 149         size_t                  cb_addrlen;
 150         u32                     cb_prog; /* used only in 4.0 case;
 151                                             per-session otherwise */
 152         u32                     cb_ident;       /* minorversion 0 only */
 153         struct svc_xprt         *cb_xprt;       /* minorversion 1 only */
 154 };
 155 
 156 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
 157 {
 158         return container_of(s, struct nfs4_delegation, dl_stid);
 159 }
 160 
 161 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 162 #define NFSD_MAX_SLOTS_PER_SESSION     160
 163 /* Maximum number of operations per session compound */
 164 #define NFSD_MAX_OPS_PER_COMPOUND       16
 165 /* Maximum  session per slot cache size */
 166 #define NFSD_SLOT_CACHE_SIZE            2048
 167 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 168 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION       32
 169 #define NFSD_MAX_MEM_PER_SESSION  \
 170                 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 171 
 172 struct nfsd4_slot {
 173         u32     sl_seqid;
 174         __be32  sl_status;
 175         struct svc_cred sl_cred;
 176         u32     sl_datalen;
 177         u16     sl_opcnt;
 178 #define NFSD4_SLOT_INUSE        (1 << 0)
 179 #define NFSD4_SLOT_CACHETHIS    (1 << 1)
 180 #define NFSD4_SLOT_INITIALIZED  (1 << 2)
 181 #define NFSD4_SLOT_CACHED       (1 << 3)
 182         u8      sl_flags;
 183         char    sl_data[];
 184 };
 185 
 186 struct nfsd4_channel_attrs {
 187         u32             headerpadsz;
 188         u32             maxreq_sz;
 189         u32             maxresp_sz;
 190         u32             maxresp_cached;
 191         u32             maxops;
 192         u32             maxreqs;
 193         u32             nr_rdma_attrs;
 194         u32             rdma_attrs;
 195 };
 196 
 197 struct nfsd4_cb_sec {
 198         u32     flavor; /* (u32)(-1) used to mean "no valid flavor" */
 199         kuid_t  uid;
 200         kgid_t  gid;
 201 };
 202 
 203 struct nfsd4_create_session {
 204         clientid_t                      clientid;
 205         struct nfs4_sessionid           sessionid;
 206         u32                             seqid;
 207         u32                             flags;
 208         struct nfsd4_channel_attrs      fore_channel;
 209         struct nfsd4_channel_attrs      back_channel;
 210         u32                             callback_prog;
 211         struct nfsd4_cb_sec             cb_sec;
 212 };
 213 
 214 struct nfsd4_backchannel_ctl {
 215         u32     bc_cb_program;
 216         struct nfsd4_cb_sec             bc_cb_sec;
 217 };
 218 
 219 struct nfsd4_bind_conn_to_session {
 220         struct nfs4_sessionid           sessionid;
 221         u32                             dir;
 222 };
 223 
 224 /* The single slot clientid cache structure */
 225 struct nfsd4_clid_slot {
 226         u32                             sl_seqid;
 227         __be32                          sl_status;
 228         struct nfsd4_create_session     sl_cr_ses;
 229 };
 230 
 231 struct nfsd4_conn {
 232         struct list_head cn_persession;
 233         struct svc_xprt *cn_xprt;
 234         struct svc_xpt_user cn_xpt_user;
 235         struct nfsd4_session *cn_session;
 236 /* CDFC4_FORE, CDFC4_BACK: */
 237         unsigned char cn_flags;
 238 };
 239 
 240 /*
 241  * Representation of a v4.1+ session. These are refcounted in a similar fashion
 242  * to the nfs4_client. References are only taken when the server is actively
 243  * working on the object (primarily during the processing of compounds).
 244  */
 245 struct nfsd4_session {
 246         atomic_t                se_ref;
 247         struct list_head        se_hash;        /* hash by sessionid */
 248         struct list_head        se_perclnt;
 249 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
 250 #define NFS4_SESSION_DEAD       0x010
 251         u32                     se_flags;
 252         struct nfs4_client      *se_client;
 253         struct nfs4_sessionid   se_sessionid;
 254         struct nfsd4_channel_attrs se_fchannel;
 255         struct nfsd4_channel_attrs se_bchannel;
 256         struct nfsd4_cb_sec     se_cb_sec;
 257         struct list_head        se_conns;
 258         u32                     se_cb_prog;
 259         u32                     se_cb_seq_nr;
 260         struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 261 };
 262 
 263 /* formatted contents of nfs4_sessionid */
 264 struct nfsd4_sessionid {
 265         clientid_t      clientid;
 266         u32             sequence;
 267         u32             reserved;
 268 };
 269 
 270 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 271 
 272 /*
 273  * struct nfs4_client - one per client.  Clientids live here.
 274  *
 275  * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
 276  * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
 277  * Each nfsd_net_ns object contains a set of these and they are tracked via
 278  * short and long form clientid. They are hashed and searched for under the
 279  * per-nfsd_net client_lock spinlock.
 280  *
 281  * References to it are only held during the processing of compounds, and in
 282  * certain other operations. In their "resting state" they have a refcount of
 283  * 0. If they are not renewed within a lease period, they become eligible for
 284  * destruction by the laundromat.
 285  *
 286  * These objects can also be destroyed prematurely by the fault injection code,
 287  * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
 288  * Care is taken *not* to do this however when the objects have an elevated
 289  * refcount.
 290  *
 291  * o Each nfs4_client is hashed by clientid
 292  *
 293  * o Each nfs4_clients is also hashed by name (the opaque quantity initially
 294  *   sent by the client to identify itself).
 295  *        
 296  * o cl_perclient list is used to ensure no dangling stateowner references
 297  *   when we expire the nfs4_client
 298  */
 299 struct nfs4_client {
 300         struct list_head        cl_idhash;      /* hash by cl_clientid.id */
 301         struct rb_node          cl_namenode;    /* link into by-name trees */
 302         struct list_head        *cl_ownerstr_hashtbl;
 303         struct list_head        cl_openowners;
 304         struct idr              cl_stateids;    /* stateid lookup */
 305         struct list_head        cl_delegations;
 306         struct list_head        cl_revoked;     /* unacknowledged, revoked 4.1 state */
 307         struct list_head        cl_lru;         /* tail queue */
 308 #ifdef CONFIG_NFSD_PNFS
 309         struct list_head        cl_lo_states;   /* outstanding layout states */
 310 #endif
 311         struct xdr_netobj       cl_name;        /* id generated by client */
 312         nfs4_verifier           cl_verifier;    /* generated by client */
 313         time_t                  cl_time;        /* time of last lease renewal */
 314         struct sockaddr_storage cl_addr;        /* client ipaddress */
 315         bool                    cl_mach_cred;   /* SP4_MACH_CRED in force */
 316         struct svc_cred         cl_cred;        /* setclientid principal */
 317         clientid_t              cl_clientid;    /* generated by server */
 318         nfs4_verifier           cl_confirm;     /* generated by server */
 319         u32                     cl_minorversion;
 320         /* NFSv4.1 client implementation id: */
 321         struct xdr_netobj       cl_nii_domain;
 322         struct xdr_netobj       cl_nii_name;
 323         struct timespec         cl_nii_time;
 324 
 325         /* for v4.0 and v4.1 callbacks: */
 326         struct nfs4_cb_conn     cl_cb_conn;
 327 #define NFSD4_CLIENT_CB_UPDATE          (0)
 328 #define NFSD4_CLIENT_CB_KILL            (1)
 329 #define NFSD4_CLIENT_STABLE             (2)     /* client on stable storage */
 330 #define NFSD4_CLIENT_RECLAIM_COMPLETE   (3)     /* reclaim_complete done */
 331 #define NFSD4_CLIENT_CONFIRMED          (4)     /* client is confirmed */
 332 #define NFSD4_CLIENT_UPCALL_LOCK        (5)     /* upcall serialization */
 333 #define NFSD4_CLIENT_CB_FLAG_MASK       (1 << NFSD4_CLIENT_CB_UPDATE | \
 334                                          1 << NFSD4_CLIENT_CB_KILL)
 335         unsigned long           cl_flags;
 336         const struct cred       *cl_cb_cred;
 337         struct rpc_clnt         *cl_cb_client;
 338         u32                     cl_cb_ident;
 339 #define NFSD4_CB_UP             0
 340 #define NFSD4_CB_UNKNOWN        1
 341 #define NFSD4_CB_DOWN           2
 342 #define NFSD4_CB_FAULT          3
 343         int                     cl_cb_state;
 344         struct nfsd4_callback   cl_cb_null;
 345         struct nfsd4_session    *cl_cb_session;
 346 
 347         /* for all client information that callback code might need: */
 348         spinlock_t              cl_lock;
 349 
 350         /* for nfs41 */
 351         struct list_head        cl_sessions;
 352         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
 353         u32                     cl_exchange_flags;
 354         /* number of rpc's in progress over an associated session: */
 355         atomic_t                cl_rpc_users;
 356         struct nfsdfs_client    cl_nfsdfs;
 357         struct nfs4_op_map      cl_spo_must_allow;
 358 
 359         /* debugging info directory under nfsd/clients/ : */
 360         struct dentry           *cl_nfsd_dentry;
 361 
 362         /* for nfs41 callbacks */
 363         /* We currently support a single back channel with a single slot */
 364         unsigned long           cl_cb_slot_busy;
 365         struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
 366                                                 /* wait here for slots */
 367         struct net              *net;
 368         struct list_head        async_copies;   /* list of async copies */
 369         spinlock_t              async_lock;     /* lock for async copies */
 370 };
 371 
 372 /* struct nfs4_client_reset
 373  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 374  * upon lease reset, or from upcall to state_daemon (to read in state
 375  * from non-volitile storage) upon reboot.
 376  */
 377 struct nfs4_client_reclaim {
 378         struct list_head        cr_strhash;     /* hash by cr_name */
 379         struct nfs4_client      *cr_clp;        /* pointer to associated clp */
 380         struct xdr_netobj       cr_name;        /* recovery dir name */
 381         struct xdr_netobj       cr_princhash;
 382 };
 383 
 384 /* A reasonable value for REPLAY_ISIZE was estimated as follows:  
 385  * The OPEN response, typically the largest, requires 
 386  *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) + 
 387  *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) + 
 388  *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes 
 389  */
 390 
 391 #define NFSD4_REPLAY_ISIZE       112 
 392 
 393 /*
 394  * Replay buffer, where the result of the last seqid-mutating operation 
 395  * is cached. 
 396  */
 397 struct nfs4_replay {
 398         __be32                  rp_status;
 399         unsigned int            rp_buflen;
 400         char                    *rp_buf;
 401         struct knfsd_fh         rp_openfh;
 402         struct mutex            rp_mutex;
 403         char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
 404 };
 405 
 406 struct nfs4_stateowner;
 407 
 408 struct nfs4_stateowner_operations {
 409         void (*so_unhash)(struct nfs4_stateowner *);
 410         void (*so_free)(struct nfs4_stateowner *);
 411 };
 412 
 413 /*
 414  * A core object that represents either an open or lock owner. The object and
 415  * lock owner objects have one of these embedded within them. Refcounts and
 416  * other fields common to both owner types are contained within these
 417  * structures.
 418  */
 419 struct nfs4_stateowner {
 420         struct list_head                        so_strhash;
 421         struct list_head                        so_stateids;
 422         struct nfs4_client                      *so_client;
 423         const struct nfs4_stateowner_operations *so_ops;
 424         /* after increment in nfsd4_bump_seqid, represents the next
 425          * sequence id expected from the client: */
 426         atomic_t                                so_count;
 427         u32                                     so_seqid;
 428         struct xdr_netobj                       so_owner; /* open owner name */
 429         struct nfs4_replay                      so_replay;
 430         bool                                    so_is_open_owner;
 431 };
 432 
 433 /*
 434  * When a file is opened, the client provides an open state owner opaque string
 435  * that indicates the "owner" of that open. These objects are refcounted.
 436  * References to it are held by each open state associated with it. This object
 437  * is a superset of the nfs4_stateowner struct.
 438  */
 439 struct nfs4_openowner {
 440         struct nfs4_stateowner  oo_owner; /* must be first field */
 441         struct list_head        oo_perclient;
 442         /*
 443          * We keep around openowners a little while after last close,
 444          * which saves clients from having to confirm, and allows us to
 445          * handle close replays if they come soon enough.  The close_lru
 446          * is a list of such openowners, to be reaped by the laundromat
 447          * thread eventually if they remain unused:
 448          */
 449         struct list_head        oo_close_lru;
 450         struct nfs4_ol_stateid *oo_last_closed_stid;
 451         time_t                  oo_time; /* time of placement on so_close_lru */
 452 #define NFS4_OO_CONFIRMED   1
 453         unsigned char           oo_flags;
 454 };
 455 
 456 /*
 457  * Represents a generic "lockowner". Similar to an openowner. References to it
 458  * are held by the lock stateids that are created on its behalf. This object is
 459  * a superset of the nfs4_stateowner struct.
 460  */
 461 struct nfs4_lockowner {
 462         struct nfs4_stateowner  lo_owner;       /* must be first element */
 463         struct list_head        lo_blocked;     /* blocked file_locks */
 464 };
 465 
 466 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
 467 {
 468         return container_of(so, struct nfs4_openowner, oo_owner);
 469 }
 470 
 471 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 472 {
 473         return container_of(so, struct nfs4_lockowner, lo_owner);
 474 }
 475 
 476 /*
 477  * Per-client state indicating no. of opens and outstanding delegations
 478  * on a file from a particular client.'od' stands for 'open & delegation'
 479  */
 480 struct nfs4_clnt_odstate {
 481         struct nfs4_client      *co_client;
 482         struct nfs4_file        *co_file;
 483         struct list_head        co_perfile;
 484         refcount_t              co_odcount;
 485 };
 486 
 487 /*
 488  * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
 489  *
 490  * These objects are global. nfsd keeps one instance of a nfs4_file per
 491  * filehandle (though it may keep multiple file descriptors for each). Each
 492  * inode can have multiple filehandles associated with it, so there is
 493  * (potentially) a many to one relationship between this struct and struct
 494  * inode.
 495  *
 496  * These are hashed by filehandle in the file_hashtbl, which is protected by
 497  * the global state_lock spinlock.
 498  */
 499 struct nfs4_file {
 500         refcount_t              fi_ref;
 501         spinlock_t              fi_lock;
 502         struct hlist_node       fi_hash;        /* hash on fi_fhandle */
 503         struct list_head        fi_stateids;
 504         union {
 505                 struct list_head        fi_delegations;
 506                 struct rcu_head         fi_rcu;
 507         };
 508         struct list_head        fi_clnt_odstate;
 509         /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
 510         struct nfsd_file        *fi_fds[3];
 511         /*
 512          * Each open or lock stateid contributes 0-4 to the counts
 513          * below depending on which bits are set in st_access_bitmap:
 514          *     1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
 515          *   + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
 516          *   + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
 517          */
 518         atomic_t                fi_access[2];
 519         u32                     fi_share_deny;
 520         struct nfsd_file        *fi_deleg_file;
 521         int                     fi_delegees;
 522         struct knfsd_fh         fi_fhandle;
 523         bool                    fi_had_conflict;
 524 #ifdef CONFIG_NFSD_PNFS
 525         struct list_head        fi_lo_states;
 526         atomic_t                fi_lo_recalls;
 527 #endif
 528 };
 529 
 530 /*
 531  * A generic struct representing either a open or lock stateid. The nfs4_client
 532  * holds a reference to each of these objects, and they in turn hold a
 533  * reference to their respective stateowners. The client's reference is
 534  * released in response to a close or unlock (depending on whether it's an open
 535  * or lock stateid) or when the client is being destroyed.
 536  *
 537  * In the case of v4.0 open stateids, these objects are preserved for a little
 538  * while after close in order to handle CLOSE replays. Those are eventually
 539  * reclaimed via a LRU scheme by the laundromat.
 540  *
 541  * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
 542  * Better suggestions welcome.
 543  */
 544 struct nfs4_ol_stateid {
 545         struct nfs4_stid                st_stid;
 546         struct list_head                st_perfile;
 547         struct list_head                st_perstateowner;
 548         struct list_head                st_locks;
 549         struct nfs4_stateowner          *st_stateowner;
 550         struct nfs4_clnt_odstate        *st_clnt_odstate;
 551         unsigned char                   st_access_bmap;
 552         unsigned char                   st_deny_bmap;
 553         struct nfs4_ol_stateid          *st_openstp;
 554         struct mutex                    st_mutex;
 555 };
 556 
 557 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
 558 {
 559         return container_of(s, struct nfs4_ol_stateid, st_stid);
 560 }
 561 
 562 struct nfs4_layout_stateid {
 563         struct nfs4_stid                ls_stid;
 564         struct list_head                ls_perclnt;
 565         struct list_head                ls_perfile;
 566         spinlock_t                      ls_lock;
 567         struct list_head                ls_layouts;
 568         u32                             ls_layout_type;
 569         struct nfsd_file                *ls_file;
 570         struct nfsd4_callback           ls_recall;
 571         stateid_t                       ls_recall_sid;
 572         bool                            ls_recalled;
 573         struct mutex                    ls_mutex;
 574 };
 575 
 576 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
 577 {
 578         return container_of(s, struct nfs4_layout_stateid, ls_stid);
 579 }
 580 
 581 /* flags for preprocess_seqid_op() */
 582 #define RD_STATE                0x00000010
 583 #define WR_STATE                0x00000020
 584 
 585 enum nfsd4_cb_op {
 586         NFSPROC4_CLNT_CB_NULL = 0,
 587         NFSPROC4_CLNT_CB_RECALL,
 588         NFSPROC4_CLNT_CB_LAYOUT,
 589         NFSPROC4_CLNT_CB_OFFLOAD,
 590         NFSPROC4_CLNT_CB_SEQUENCE,
 591         NFSPROC4_CLNT_CB_NOTIFY_LOCK,
 592 };
 593 
 594 /* Returns true iff a is later than b: */
 595 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
 596 {
 597         return (s32)(a->si_generation - b->si_generation) > 0;
 598 }
 599 
 600 /*
 601  * When a client tries to get a lock on a file, we set one of these objects
 602  * on the blocking lock. When the lock becomes free, we can then issue a
 603  * CB_NOTIFY_LOCK to the server.
 604  */
 605 struct nfsd4_blocked_lock {
 606         struct list_head        nbl_list;
 607         struct list_head        nbl_lru;
 608         time_t                  nbl_time;
 609         struct file_lock        nbl_lock;
 610         struct knfsd_fh         nbl_fh;
 611         struct nfsd4_callback   nbl_cb;
 612 };
 613 
 614 struct nfsd4_compound_state;
 615 struct nfsd_net;
 616 struct nfsd4_copy;
 617 
 618 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
 619                 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
 620                 stateid_t *stateid, int flags, struct nfsd_file **filp);
 621 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
 622                      stateid_t *stateid, unsigned char typemask,
 623                      struct nfs4_stid **s, struct nfsd_net *nn);
 624 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
 625                                   void (*sc_free)(struct nfs4_stid *));
 626 int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
 627 void nfs4_free_cp_state(struct nfsd4_copy *copy);
 628 void nfs4_unhash_stid(struct nfs4_stid *s);
 629 void nfs4_put_stid(struct nfs4_stid *s);
 630 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
 631 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
 632 extern void nfs4_release_reclaim(struct nfsd_net *);
 633 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name,
 634                                                         struct nfsd_net *nn);
 635 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
 636                 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
 637 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 638 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 639 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 640 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
 641                 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
 642 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
 643 extern int nfsd4_create_callback_queue(void);
 644 extern void nfsd4_destroy_callback_queue(void);
 645 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 646 extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
 647 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
 648 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
 649                                 struct xdr_netobj princhash, struct nfsd_net *nn);
 650 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);
 651 
 652 struct nfs4_file *find_file(struct knfsd_fh *fh);
 653 void put_nfs4_file(struct nfs4_file *fi);
 654 extern void nfs4_put_copy(struct nfsd4_copy *copy);
 655 extern struct nfsd4_copy *
 656 find_async_copy(struct nfs4_client *clp, stateid_t *staetid);
 657 static inline void get_nfs4_file(struct nfs4_file *fi)
 658 {
 659         refcount_inc(&fi->fi_ref);
 660 }
 661 struct nfsd_file *find_any_file(struct nfs4_file *f);
 662 
 663 /* grace period management */
 664 void nfsd4_end_grace(struct nfsd_net *nn);
 665 
 666 /* nfs4recover operations */
 667 extern int nfsd4_client_tracking_init(struct net *net);
 668 extern void nfsd4_client_tracking_exit(struct net *net);
 669 extern void nfsd4_client_record_create(struct nfs4_client *clp);
 670 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
 671 extern int nfsd4_client_record_check(struct nfs4_client *clp);
 672 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
 673 
 674 /* nfs fault injection functions */
 675 #ifdef CONFIG_NFSD_FAULT_INJECTION
 676 void nfsd_fault_inject_init(void);
 677 void nfsd_fault_inject_cleanup(void);
 678 
 679 u64 nfsd_inject_print_clients(void);
 680 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
 681 u64 nfsd_inject_forget_clients(u64);
 682 
 683 u64 nfsd_inject_print_locks(void);
 684 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
 685 u64 nfsd_inject_forget_locks(u64);
 686 
 687 u64 nfsd_inject_print_openowners(void);
 688 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
 689 u64 nfsd_inject_forget_openowners(u64);
 690 
 691 u64 nfsd_inject_print_delegations(void);
 692 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
 693 u64 nfsd_inject_forget_delegations(u64);
 694 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
 695 u64 nfsd_inject_recall_delegations(u64);
 696 #else /* CONFIG_NFSD_FAULT_INJECTION */
 697 static inline void nfsd_fault_inject_init(void) {}
 698 static inline void nfsd_fault_inject_cleanup(void) {}
 699 #endif /* CONFIG_NFSD_FAULT_INJECTION */
 700 
 701 #endif   /* NFSD4_STATE_H */

/* [<][>][^][v][top][bottom][index][help] */