fs/nfs/nfs4_fs.h

   1 /*
   2  * linux/fs/nfs/nfs4_fs.h
   3  *
   4  * Copyright (C) 2005 Trond Myklebust
   5  *
   6  * NFSv4-specific filesystem definitions and declarations
   7  */
   8
   9 #ifndef __LINUX_FS_NFS_NFS4_FS_H
  10 #define __LINUX_FS_NFS_NFS4_FS_H
  11
  12 #if IS_ENABLED(CONFIG_NFS_V4)
  13
  14 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  15
  16 #include <linux/seqlock.h>
  17
  18 struct idmap;
  19
  20 enum nfs4_client_state {
  21         NFS4CLNT_MANAGER_RUNNING  = 0,
  22         NFS4CLNT_CHECK_LEASE,
  23         NFS4CLNT_LEASE_EXPIRED,
  24         NFS4CLNT_RECLAIM_REBOOT,
  25         NFS4CLNT_RECLAIM_NOGRACE,
  26         NFS4CLNT_DELEGRETURN,
  27         NFS4CLNT_SESSION_RESET,
  28         NFS4CLNT_LEASE_CONFIRM,
  29         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  30         NFS4CLNT_PURGE_STATE,
  31         NFS4CLNT_BIND_CONN_TO_SESSION,
  32 };
  33
  34 #define NFS4_RENEW_TIMEOUT              0x01
  35 #define NFS4_RENEW_DELEGATION_CB        0x02
  36
  37 struct nfs4_minor_version_ops {
  38         u32     minor_version;
  39
  40         int     (*call_sync)(struct rpc_clnt *clnt,
  41                         struct nfs_server *server,
  42                         struct rpc_message *msg,
  43                         struct nfs4_sequence_args *args,
  44                         struct nfs4_sequence_res *res);
  45         bool    (*match_stateid)(const nfs4_stateid *,
  46                         const nfs4_stateid *);
  47         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  48                         struct nfs_fsinfo *);
  49         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  50         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  51         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  52 };
  53
  54 #define NFS_SEQID_CONFIRMED 1
  55 struct nfs_seqid_counter {
  56         ktime_t create_time;
  57         int owner_id;
  58         int flags;
  59         u32 counter;
  60         spinlock_t lock;                /* Protects the list */
  61         struct list_head list;          /* Defines sequence of RPC calls */
  62         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  63 };
  64
  65 struct nfs_seqid {
  66         struct nfs_seqid_counter *sequence;
  67         struct list_head list;
  68         struct rpc_task *task;
  69 };
  70
  71 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  72 {
  73         if (seqid_mutating_err(-status))
  74                 seqid->flags |= NFS_SEQID_CONFIRMED;
  75 }
  76
  77 /*
  78  * NFS4 state_owners and lock_owners are simply labels for ordered
  79  * sequences of RPC calls. Their sole purpose is to provide once-only
  80  * semantics by allowing the server to identify replayed requests.
  81  */
  82 struct nfs4_state_owner {
  83         struct nfs_server    *so_server;
  84         struct list_head     so_lru;
  85         unsigned long        so_expires;
  86         struct rb_node       so_server_node;
  87
  88         struct rpc_cred      *so_cred;   /* Associated cred */
  89
  90         spinlock_t           so_lock;
  91         atomic_t             so_count;
  92         unsigned long        so_flags;
  93         struct list_head     so_states;
  94         struct nfs_seqid_counter so_seqid;
  95         seqcount_t           so_reclaim_seqcount;
  96         struct mutex         so_delegreturn_mutex;
  97 };
  98
  99 enum {
 100         NFS_OWNER_RECLAIM_REBOOT,
 101         NFS_OWNER_RECLAIM_NOGRACE
 102 };
 103
 104 #define NFS_LOCK_NEW            0
 105 #define NFS_LOCK_RECLAIM        1
 106 #define NFS_LOCK_EXPIRED        2
 107
 108 /*
 109  * struct nfs4_state maintains the client-side state for a given
 110  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 111  *
 112  * OPEN:
 113  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 114  * we need to know how many files are open for reading or writing on a
 115  * given inode. This information too is stored here.
 116  *
 117  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 118  */
 119
 120 struct nfs4_lock_owner {
 121         unsigned int lo_type;
 122 #define NFS4_ANY_LOCK_TYPE      (0U)
 123 #define NFS4_FLOCK_LOCK_TYPE    (1U << 0)
 124 #define NFS4_POSIX_LOCK_TYPE    (1U << 1)
 125         union {
 126                 fl_owner_t posix_owner;
 127                 pid_t flock_owner;
 128         } lo_u;
 129 };
 130
 131 struct nfs4_lock_state {
 132         struct list_head        ls_locks;       /* Other lock stateids */
 133         struct nfs4_state *     ls_state;       /* Pointer to open state */
 134 #define NFS_LOCK_INITIALIZED 0
 135         unsigned long           ls_flags;
 136         struct nfs_seqid_counter        ls_seqid;
 137         nfs4_stateid            ls_stateid;
 138         atomic_t                ls_count;
 139         struct nfs4_lock_owner  ls_owner;
 140 };
 141
 142 /* bits for nfs4_state->flags */
 143 enum {
 144         LK_STATE_IN_USE,
 145         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 146         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 147         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 148         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 149         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 150         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 151         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 152         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 153 };
 154
 155 struct nfs4_state {
 156         struct list_head open_states;   /* List of states for the same state_owner */
 157         struct list_head inode_states;  /* List of states for the same inode */
 158         struct list_head lock_states;   /* List of subservient lock stateids */
 159
 160         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 161         struct inode *inode;            /* Pointer to the inode */
 162
 163         unsigned long flags;            /* Do we hold any locks? */
 164         spinlock_t state_lock;          /* Protects the lock_states list */
 165
 166         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 167         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 168         nfs4_stateid open_stateid;      /* OPEN stateid */
 169
 170         /* The following 3 fields are protected by owner->so_lock */
 171         unsigned int n_rdonly;          /* Number of read-only references */
 172         unsigned int n_wronly;          /* Number of write-only references */
 173         unsigned int n_rdwr;            /* Number of read/write references */
 174         fmode_t state;                  /* State on the server (R,W, or RW) */
 175         atomic_t count;
 176 };
 177
 178
 179 struct nfs4_exception {
 180         long timeout;
 181         int retry;
 182         struct nfs4_state *state;
 183         struct inode *inode;
 184 };
 185
 186 struct nfs4_state_recovery_ops {
 187         int owner_flag_bit;
 188         int state_flag_bit;
 189         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 190         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 191         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 192         struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
 193         int (*reclaim_complete)(struct nfs_client *);
 194         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 195                 struct rpc_cred *);
 196 };
 197
 198 struct nfs4_state_maintenance_ops {
 199         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 200         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 201         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 202 };
 203
 204 extern const struct dentry_operations nfs4_dentry_operations;
 205
 206 /* dir.c */
 207 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 208                     unsigned, umode_t, int *);
 209
 210 /* super.c */
 211 extern struct file_system_type nfs4_fs_type;
 212
 213 /* nfs4namespace.c */
 214 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
 215 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
 216 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 217                                struct nfs_fh *, struct nfs_fattr *);
 218
 219 /* nfs4proc.c */
 220 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 221 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 222 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 223 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 224 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 225 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 226 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 227 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 228 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 229 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 230 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 231                                   struct nfs4_fs_locations *, struct page *);
 232 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 233                             struct nfs_fh *, struct nfs_fattr *);
 234 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 235 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
 236 extern const struct xattr_handler *nfs4_xattr_handlers[];
 237 extern void nfs4_set_rw_stateid(nfs4_stateid *stateid,
 238                 const struct nfs_open_context *ctx,
 239                 const struct nfs_lock_context *l_ctx,
 240                 fmode_t fmode);
 241
 242 #if defined(CONFIG_NFS_V4_1)
 243 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 244 {
 245         return server->nfs_client->cl_session;
 246 }
 247
 248 extern int nfs4_setup_sequence(const struct nfs_server *server,
 249                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 250                 struct rpc_task *task);
 251 extern int nfs41_setup_sequence(struct nfs4_session *session,
 252                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 253                 struct rpc_task *task);
 254 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 255 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 256 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 257                 struct nfs_fsinfo *fsinfo);
 258 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 259                                   bool sync);
 260
 261 static inline bool
 262 is_ds_only_client(struct nfs_client *clp)
 263 {
 264         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 265                 EXCHGID4_FLAG_USE_PNFS_DS;
 266 }
 267
 268 static inline bool
 269 is_ds_client(struct nfs_client *clp)
 270 {
 271         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 272 }
 273 #else /* CONFIG_NFS_v4_1 */
 274 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 275 {
 276         return NULL;
 277 }
 278
 279 static inline int nfs4_setup_sequence(const struct nfs_server *server,
 280                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 281                 struct rpc_task *task)
 282 {
 283         rpc_call_start(task);
 284         return 0;
 285 }
 286
 287 static inline bool
 288 is_ds_only_client(struct nfs_client *clp)
 289 {
 290         return false;
 291 }
 292
 293 static inline bool
 294 is_ds_client(struct nfs_client *clp)
 295 {
 296         return false;
 297 }
 298 #endif /* CONFIG_NFS_V4_1 */
 299
 300 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 301
 302 extern const u32 nfs4_fattr_bitmap[3];
 303 extern const u32 nfs4_statfs_bitmap[2];
 304 extern const u32 nfs4_pathconf_bitmap[2];
 305 extern const u32 nfs4_fsinfo_bitmap[3];
 306 extern const u32 nfs4_fs_locations_bitmap[2];
 307
 308 void nfs4_free_client(struct nfs_client *);
 309
 310 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 311
 312 /* nfs4renewd.c */
 313 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 314 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 315 extern void nfs4_kill_renewd(struct nfs_client *);
 316 extern void nfs4_renew_state(struct work_struct *);
 317
 318 /* nfs4state.c */
 319 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 320 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 321 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 322 int nfs4_discover_server_trunking(struct nfs_client *clp,
 323                         struct nfs_client **);
 324 int nfs40_discover_server_trunking(struct nfs_client *clp,
 325                         struct nfs_client **, struct rpc_cred *);
 326 #if defined(CONFIG_NFS_V4_1)
 327 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 328 int nfs41_discover_server_trunking(struct nfs_client *clp,
 329                         struct nfs_client **, struct rpc_cred *);
 330 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 331 extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
 332 extern void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp);
 333
 334 #else
 335 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 336 {
 337 }
 338 #endif /* CONFIG_NFS_V4_1 */
 339
 340 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 341 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 342 extern void nfs4_purge_state_owners(struct nfs_server *);
 343 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 344 extern void nfs4_put_open_state(struct nfs4_state *);
 345 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 346 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 347 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 348 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 349                 const nfs4_stateid *stateid);
 350 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 351 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 352 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 353 extern void nfs4_schedule_state_manager(struct nfs_client *);
 354 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 355 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 356 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 357 extern void nfs41_handle_server_scope(struct nfs_client *,
 358                                       struct nfs41_server_scope **);
 359 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 360 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 361 extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 362                 fmode_t, const struct nfs_lockowner *);
 363
 364 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 365 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 366 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 367 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 368 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 369 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 370
 371 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 372
 373 extern const nfs4_stateid zero_stateid;
 374
 375 /* nfs4super.c */
 376 struct nfs_mount_info;
 377 extern struct nfs_subversion nfs_v4;
 378 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 379 extern bool nfs4_disable_idmapping;
 380 extern unsigned short max_session_slots;
 381 extern unsigned short send_implementation_id;
 382
 383 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 384 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 385
 386 /* nfs4sysctl.c */
 387 #ifdef CONFIG_SYSCTL
 388 int nfs4_register_sysctl(void);
 389 void nfs4_unregister_sysctl(void);
 390 #else
 391 static inline int nfs4_register_sysctl(void)
 392 {
 393         return 0;
 394 }
 395
 396 static inline void nfs4_unregister_sysctl(void)
 397 {
 398 }
 399 #endif
 400
 401 /* nfs4xdr.c */
 402 extern struct rpc_procinfo nfs4_procedures[];
 403
 404 struct nfs4_mount_data;
 405
 406 /* callback_xdr.c */
 407 extern struct svc_version nfs4_callback_version1;
 408 extern struct svc_version nfs4_callback_version4;
 409
 410 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 411 {
 412         memcpy(dst, src, sizeof(*dst));
 413 }
 414
 415 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 416 {
 417         return memcmp(dst, src, sizeof(*dst)) == 0;
 418 }
 419
 420 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 421 {
 422         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 423 }
 424
 425 #else
 426
 427 #define nfs4_close_state(a, b) do { } while (0)
 428 #define nfs4_close_sync(a, b) do { } while (0)
 429
 430 #endif /* CONFIG_NFS_V4 */
 431 #endif /* __LINUX_FS_NFS_NFS4_FS.H */