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