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 #ifdef CONFIG_NFS_V4
  13
  14 struct idmap;
  15
  16 enum nfs4_client_state {
  17         NFS4CLNT_MANAGER_RUNNING  = 0,
  18         NFS4CLNT_CHECK_LEASE,
  19         NFS4CLNT_LEASE_EXPIRED,
  20         NFS4CLNT_RECLAIM_REBOOT,
  21         NFS4CLNT_RECLAIM_NOGRACE,
  22         NFS4CLNT_DELEGRETURN,
  23         NFS4CLNT_SESSION_RESET,
  24         NFS4CLNT_RECALL_SLOT,
  25         NFS4CLNT_LEASE_CONFIRM,
  26         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  27         NFS4CLNT_PURGE_STATE,
  28         NFS4CLNT_BIND_CONN_TO_SESSION,
  29 };
  30
  31 enum nfs4_session_state {
  32         NFS4_SESSION_INITING,
  33         NFS4_SESSION_DRAINING,
  34 };
  35
  36 #define NFS4_RENEW_TIMEOUT              0x01
  37 #define NFS4_RENEW_DELEGATION_CB        0x02
  38
  39 struct nfs4_minor_version_ops {
  40         u32     minor_version;
  41
  42         int     (*call_sync)(struct rpc_clnt *clnt,
  43                         struct nfs_server *server,
  44                         struct rpc_message *msg,
  45                         struct nfs4_sequence_args *args,
  46                         struct nfs4_sequence_res *res,
  47                         int cache_reply);
  48         bool    (*match_stateid)(const nfs4_stateid *,
  49                         const nfs4_stateid *);
  50         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  51                         struct nfs_fsinfo *);
  52         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  53         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  54         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  55 };
  56
  57 #define NFS_SEQID_CONFIRMED 1
  58 struct nfs_seqid_counter {
  59         ktime_t create_time;
  60         int owner_id;
  61         int flags;
  62         u32 counter;
  63         spinlock_t lock;                /* Protects the list */
  64         struct list_head list;          /* Defines sequence of RPC calls */
  65         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  66 };
  67
  68 struct nfs_seqid {
  69         struct nfs_seqid_counter *sequence;
  70         struct list_head list;
  71         struct rpc_task *task;
  72 };
  73
  74 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  75 {
  76         if (seqid_mutating_err(-status))
  77                 seqid->flags |= NFS_SEQID_CONFIRMED;
  78 }
  79
  80 /*
  81  * NFS4 state_owners and lock_owners are simply labels for ordered
  82  * sequences of RPC calls. Their sole purpose is to provide once-only
  83  * semantics by allowing the server to identify replayed requests.
  84  */
  85 struct nfs4_state_owner {
  86         struct nfs_server    *so_server;
  87         struct list_head     so_lru;
  88         unsigned long        so_expires;
  89         struct rb_node       so_server_node;
  90
  91         struct rpc_cred      *so_cred;   /* Associated cred */
  92
  93         spinlock_t           so_lock;
  94         atomic_t             so_count;
  95         unsigned long        so_flags;
  96         struct list_head     so_states;
  97         struct nfs_seqid_counter so_seqid;
  98 };
  99
 100 enum {
 101         NFS_OWNER_RECLAIM_REBOOT,
 102         NFS_OWNER_RECLAIM_NOGRACE
 103 };
 104
 105 #define NFS_LOCK_NEW            0
 106 #define NFS_LOCK_RECLAIM        1
 107 #define NFS_LOCK_EXPIRED        2
 108
 109 /*
 110  * struct nfs4_state maintains the client-side state for a given
 111  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 112  *
 113  * OPEN:
 114  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 115  * we need to know how many files are open for reading or writing on a
 116  * given inode. This information too is stored here.
 117  *
 118  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 119  */
 120
 121 struct nfs4_lock_owner {
 122         unsigned int lo_type;
 123 #define NFS4_ANY_LOCK_TYPE      (0U)
 124 #define NFS4_FLOCK_LOCK_TYPE    (1U << 0)
 125 #define NFS4_POSIX_LOCK_TYPE    (1U << 1)
 126         union {
 127                 fl_owner_t posix_owner;
 128                 pid_t flock_owner;
 129         } lo_u;
 130 };
 131
 132 struct nfs4_lock_state {
 133         struct list_head        ls_locks;       /* Other lock stateids */
 134         struct nfs4_state *     ls_state;       /* Pointer to open state */
 135 #define NFS_LOCK_INITIALIZED 1
 136         int                     ls_flags;
 137         struct nfs_seqid_counter        ls_seqid;
 138         nfs4_stateid            ls_stateid;
 139         atomic_t                ls_count;
 140         struct nfs4_lock_owner  ls_owner;
 141 };
 142
 143 /* bits for nfs4_state->flags */
 144 enum {
 145         LK_STATE_IN_USE,
 146         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 147         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 148         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 149         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 150         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 151         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 152         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 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 };
 195
 196 struct nfs4_state_maintenance_ops {
 197         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 198         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 199         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 200 };
 201
 202 extern const struct dentry_operations nfs4_dentry_operations;
 203
 204 /* dir.c */
 205 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 206                     unsigned, umode_t, int *);
 207
 208 /* write.c */
 209 int nfs4_write_inode(struct inode *, struct writeback_control *);
 210
 211 /* nfs4namespace.c */
 212 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
 213 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
 214 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 215                                struct nfs_fh *, struct nfs_fattr *);
 216
 217 /* nfs4proc.c */
 218 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 219 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 220 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 221 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 222 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 223 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 224 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 225 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 226 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
 227 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 228 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 229                                   struct nfs4_fs_locations *, struct page *);
 230 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 231                             struct nfs_fh *, struct nfs_fattr *);
 232 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 233 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
 234 extern const struct xattr_handler *nfs4_xattr_handlers[];
 235
 236 #if defined(CONFIG_NFS_V4_1)
 237 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 238 {
 239         return server->nfs_client->cl_session;
 240 }
 241
 242 extern bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy);
 243 extern int nfs4_setup_sequence(const struct nfs_server *server,
 244                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 245                 struct rpc_task *task);
 246 extern int nfs41_setup_sequence(struct nfs4_session *session,
 247                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 248                 struct rpc_task *task);
 249 extern void nfs4_destroy_session(struct nfs4_session *session);
 250 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 251 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 252 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 253 extern int nfs4_init_session(struct nfs_server *server);
 254 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 255                 struct nfs_fsinfo *fsinfo);
 256 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 257                                   bool sync);
 258
 259 static inline bool
 260 is_ds_only_client(struct nfs_client *clp)
 261 {
 262         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 263                 EXCHGID4_FLAG_USE_PNFS_DS;
 264 }
 265
 266 static inline bool
 267 is_ds_client(struct nfs_client *clp)
 268 {
 269         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 270 }
 271 #else /* CONFIG_NFS_v4_1 */
 272 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 273 {
 274         return NULL;
 275 }
 276
 277 static inline int nfs4_setup_sequence(const struct nfs_server *server,
 278                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 279                 struct rpc_task *task)
 280 {
 281         return 0;
 282 }
 283
 284 static inline int nfs4_init_session(struct nfs_server *server)
 285 {
 286         return 0;
 287 }
 288
 289 static inline bool
 290 is_ds_only_client(struct nfs_client *clp)
 291 {
 292         return false;
 293 }
 294
 295 static inline bool
 296 is_ds_client(struct nfs_client *clp)
 297 {
 298         return false;
 299 }
 300 #endif /* CONFIG_NFS_V4_1 */
 301
 302 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 303
 304 extern const u32 nfs4_fattr_bitmap[3];
 305 extern const u32 nfs4_statfs_bitmap[2];
 306 extern const u32 nfs4_pathconf_bitmap[2];
 307 extern const u32 nfs4_fsinfo_bitmap[3];
 308 extern const u32 nfs4_fs_locations_bitmap[2];
 309
 310 void nfs4_free_client(struct nfs_client *);
 311
 312 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 313
 314 /* nfs4renewd.c */
 315 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 316 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 317 extern void nfs4_kill_renewd(struct nfs_client *);
 318 extern void nfs4_renew_state(struct work_struct *);
 319
 320 /* nfs4state.c */
 321 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 322 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 323 #if defined(CONFIG_NFS_V4_1)
 324 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 325 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 326 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 327 #else
 328 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 329 {
 330 }
 331 #endif /* CONFIG_NFS_V4_1 */
 332
 333 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 334 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 335 extern void nfs4_purge_state_owners(struct nfs_server *);
 336 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 337 extern void nfs4_put_open_state(struct nfs4_state *);
 338 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 339 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 340 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 341 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 342                 const nfs4_stateid *stateid);
 343 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 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_recall_slot(struct nfs_client *clp);
 349 extern void nfs41_handle_server_scope(struct nfs_client *,
 350                                       struct nfs41_server_scope **);
 351 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 352 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 353 extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 354                 fmode_t, fl_owner_t, pid_t);
 355
 356 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 357 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 358 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 359 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 360 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 361 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 362
 363 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 364
 365 extern const nfs4_stateid zero_stateid;
 366
 367 /* nfs4super.c */
 368 struct nfs_mount_info;
 369 extern struct nfs_subversion nfs_v4;
 370 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *);
 371 int init_nfs_v4(void);
 372 void exit_nfs_v4(void);
 373
 374 /* nfs4sysctl.c */
 375 #ifdef CONFIG_SYSCTL
 376 int nfs4_register_sysctl(void);
 377 void nfs4_unregister_sysctl(void);
 378 #else
 379 static inline int nfs4_register_sysctl(void)
 380 {
 381         return 0;
 382 }
 383
 384 static inline void nfs4_unregister_sysctl(void)
 385 {
 386 }
 387 #endif
 388
 389 /* nfs4xdr.c */
 390 extern struct rpc_procinfo nfs4_procedures[];
 391
 392 struct nfs4_mount_data;
 393
 394 /* callback_xdr.c */
 395 extern struct svc_version nfs4_callback_version1;
 396 extern struct svc_version nfs4_callback_version4;
 397
 398 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 399 {
 400         memcpy(dst, src, sizeof(*dst));
 401 }
 402
 403 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 404 {
 405         return memcmp(dst, src, sizeof(*dst)) == 0;
 406 }
 407
 408 #else
 409
 410 #define nfs4_close_state(a, b) do { } while (0)
 411 #define nfs4_close_sync(a, b) do { } while (0)
 412
 413 #endif /* CONFIG_NFS_V4 */
 414 #endif /* __LINUX_FS_NFS_NFS4_FS.H */