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_LAYOUTRECALL,
  24         NFS4CLNT_SESSION_RESET,
  25         NFS4CLNT_RECALL_SLOT,
  26         NFS4CLNT_LEASE_CONFIRM,
  27         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  28 };
  29
  30 enum nfs4_session_state {
  31         NFS4_SESSION_INITING,
  32         NFS4_SESSION_DRAINING,
  33 };
  34
  35 #define NFS4_RENEW_TIMEOUT              0x01
  36 #define NFS4_RENEW_DELEGATION_CB        0x02
  37
  38 struct nfs4_minor_version_ops {
  39         u32     minor_version;
  40
  41         int     (*call_sync)(struct rpc_clnt *clnt,
  42                         struct nfs_server *server,
  43                         struct rpc_message *msg,
  44                         struct nfs4_sequence_args *args,
  45                         struct nfs4_sequence_res *res,
  46                         int cache_reply);
  47         int     (*validate_stateid)(struct nfs_delegation *,
  48                         const nfs4_stateid *);
  49         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  50                         struct nfs_fsinfo *);
  51         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  52         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  53         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  54 };
  55
  56 /*
  57  * struct rpc_sequence ensures that RPC calls are sent in the exact
  58  * order that they appear on the list.
  59  */
  60 struct rpc_sequence {
  61         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  62         spinlock_t lock;                /* Protects the list */
  63         struct list_head list;          /* Defines sequence of RPC calls */
  64 };
  65
  66 #define NFS_SEQID_CONFIRMED 1
  67 struct nfs_seqid_counter {
  68         struct rpc_sequence *sequence;
  69         int flags;
  70         u32 counter;
  71 };
  72
  73 struct nfs_seqid {
  74         struct nfs_seqid_counter *sequence;
  75         struct list_head list;
  76 };
  77
  78 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  79 {
  80         if (seqid_mutating_err(-status))
  81                 seqid->flags |= NFS_SEQID_CONFIRMED;
  82 }
  83
  84 struct nfs_unique_id {
  85         struct rb_node rb_node;
  86         __u64 id;
  87 };
  88
  89 /*
  90  * NFS4 state_owners and lock_owners are simply labels for ordered
  91  * sequences of RPC calls. Their sole purpose is to provide once-only
  92  * semantics by allowing the server to identify replayed requests.
  93  */
  94 struct nfs4_state_owner {
  95         struct nfs_unique_id so_owner_id;
  96         struct nfs_server    *so_server;
  97         struct list_head     so_lru;
  98         unsigned long        so_expires;
  99         struct rb_node       so_server_node;
 100
 101         struct rpc_cred      *so_cred;   /* Associated cred */
 102
 103         spinlock_t           so_lock;
 104         atomic_t             so_count;
 105         unsigned long        so_flags;
 106         struct list_head     so_states;
 107         struct nfs_seqid_counter so_seqid;
 108         struct rpc_sequence  so_sequence;
 109 };
 110
 111 enum {
 112         NFS_OWNER_RECLAIM_REBOOT,
 113         NFS_OWNER_RECLAIM_NOGRACE
 114 };
 115
 116 #define NFS_LOCK_NEW            0
 117 #define NFS_LOCK_RECLAIM        1
 118 #define NFS_LOCK_EXPIRED        2
 119
 120 /*
 121  * struct nfs4_state maintains the client-side state for a given
 122  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 123  *
 124  * OPEN:
 125  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 126  * we need to know how many files are open for reading or writing on a
 127  * given inode. This information too is stored here.
 128  *
 129  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 130  */
 131
 132 struct nfs4_lock_owner {
 133         unsigned int lo_type;
 134 #define NFS4_ANY_LOCK_TYPE      (0U)
 135 #define NFS4_FLOCK_LOCK_TYPE    (1U << 0)
 136 #define NFS4_POSIX_LOCK_TYPE    (1U << 1)
 137         union {
 138                 fl_owner_t posix_owner;
 139                 pid_t flock_owner;
 140         } lo_u;
 141 };
 142
 143 struct nfs4_lock_state {
 144         struct list_head        ls_locks;       /* Other lock stateids */
 145         struct nfs4_state *     ls_state;       /* Pointer to open state */
 146 #define NFS_LOCK_INITIALIZED 1
 147         int                     ls_flags;
 148         struct nfs_seqid_counter        ls_seqid;
 149         struct rpc_sequence     ls_sequence;
 150         struct nfs_unique_id    ls_id;
 151         nfs4_stateid            ls_stateid;
 152         atomic_t                ls_count;
 153         struct nfs4_lock_owner  ls_owner;
 154 };
 155
 156 /* bits for nfs4_state->flags */
 157 enum {
 158         LK_STATE_IN_USE,
 159         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 160         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 161         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 162         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 163         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 164         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 165         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 166 };
 167
 168 struct nfs4_state {
 169         struct list_head open_states;   /* List of states for the same state_owner */
 170         struct list_head inode_states;  /* List of states for the same inode */
 171         struct list_head lock_states;   /* List of subservient lock stateids */
 172
 173         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 174         struct inode *inode;            /* Pointer to the inode */
 175
 176         unsigned long flags;            /* Do we hold any locks? */
 177         spinlock_t state_lock;          /* Protects the lock_states list */
 178
 179         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 180         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 181         nfs4_stateid open_stateid;      /* OPEN stateid */
 182
 183         /* The following 3 fields are protected by owner->so_lock */
 184         unsigned int n_rdonly;          /* Number of read-only references */
 185         unsigned int n_wronly;          /* Number of write-only references */
 186         unsigned int n_rdwr;            /* Number of read/write references */
 187         fmode_t state;                  /* State on the server (R,W, or RW) */
 188         atomic_t count;
 189 };
 190
 191
 192 struct nfs4_exception {
 193         long timeout;
 194         int retry;
 195         struct nfs4_state *state;
 196         struct inode *inode;
 197 };
 198
 199 struct nfs4_state_recovery_ops {
 200         int owner_flag_bit;
 201         int state_flag_bit;
 202         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 203         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 204         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 205         struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
 206         int (*reclaim_complete)(struct nfs_client *);
 207 };
 208
 209 struct nfs4_state_maintenance_ops {
 210         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 211         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 212         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 213 };
 214
 215 extern const struct dentry_operations nfs4_dentry_operations;
 216 extern const struct inode_operations nfs4_dir_inode_operations;
 217
 218 /* nfs4proc.c */
 219 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 220 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 221 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 222 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 223 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 224 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
 225 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 226 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 227                 struct nfs4_fs_locations *fs_locations, struct page *page);
 228 extern void nfs4_release_lockowner(const struct nfs4_lock_state *);
 229 extern const struct xattr_handler *nfs4_xattr_handlers[];
 230
 231 #if defined(CONFIG_NFS_V4_1)
 232 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 233 {
 234         return server->nfs_client->cl_session;
 235 }
 236
 237 extern int nfs4_setup_sequence(const struct nfs_server *server,
 238                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 239                 int cache_reply, struct rpc_task *task);
 240 extern int nfs41_setup_sequence(struct nfs4_session *session,
 241                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 242                 int cache_reply, struct rpc_task *task);
 243 extern void nfs4_destroy_session(struct nfs4_session *session);
 244 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 245 extern int nfs4_proc_create_session(struct nfs_client *);
 246 extern int nfs4_proc_destroy_session(struct nfs4_session *);
 247 extern int nfs4_init_session(struct nfs_server *server);
 248 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 249                 struct nfs_fsinfo *fsinfo);
 250 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 251                                   bool sync);
 252
 253 static inline bool
 254 is_ds_only_client(struct nfs_client *clp)
 255 {
 256         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 257                 EXCHGID4_FLAG_USE_PNFS_DS;
 258 }
 259
 260 static inline bool
 261 is_ds_client(struct nfs_client *clp)
 262 {
 263         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 264 }
 265 #else /* CONFIG_NFS_v4_1 */
 266 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 267 {
 268         return NULL;
 269 }
 270
 271 static inline int nfs4_setup_sequence(const struct nfs_server *server,
 272                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 273                 int cache_reply, struct rpc_task *task)
 274 {
 275         return 0;
 276 }
 277
 278 static inline int nfs4_init_session(struct nfs_server *server)
 279 {
 280         return 0;
 281 }
 282
 283 static inline bool
 284 is_ds_only_client(struct nfs_client *clp)
 285 {
 286         return false;
 287 }
 288
 289 static inline bool
 290 is_ds_client(struct nfs_client *clp)
 291 {
 292         return false;
 293 }
 294 #endif /* CONFIG_NFS_V4_1 */
 295
 296 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 297
 298 extern const u32 nfs4_fattr_bitmap[2];
 299 extern const u32 nfs4_statfs_bitmap[2];
 300 extern const u32 nfs4_pathconf_bitmap[2];
 301 extern const u32 nfs4_fsinfo_bitmap[3];
 302 extern const u32 nfs4_fs_locations_bitmap[2];
 303
 304 /* nfs4renewd.c */
 305 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 306 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 307 extern void nfs4_kill_renewd(struct nfs_client *);
 308 extern void nfs4_renew_state(struct work_struct *);
 309
 310 /* nfs4state.c */
 311 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 312 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 313 #if defined(CONFIG_NFS_V4_1)
 314 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 315 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 316 extern void nfs4_schedule_session_recovery(struct nfs4_session *);
 317 #else
 318 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session)
 319 {
 320 }
 321 #endif /* CONFIG_NFS_V4_1 */
 322
 323 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 324 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 325 extern void nfs4_purge_state_owners(struct nfs_server *);
 326 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 327 extern void nfs4_put_open_state(struct nfs4_state *);
 328 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 329 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 330 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 331 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 332                 const nfs4_stateid *stateid);
 333 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 334 extern void nfs4_schedule_state_manager(struct nfs_client *);
 335 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 336 extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 337 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 338 extern void nfs41_handle_recall_slot(struct nfs_client *clp);
 339 extern void nfs41_handle_server_scope(struct nfs_client *,
 340                                       struct server_scope **);
 341 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 342 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 343 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
 344
 345 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 346 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 347 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 348 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 349 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 350 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 351
 352 extern const nfs4_stateid zero_stateid;
 353
 354 /* nfs4xdr.c */
 355 extern struct rpc_procinfo nfs4_procedures[];
 356
 357 struct nfs4_mount_data;
 358
 359 /* callback_xdr.c */
 360 extern struct svc_version nfs4_callback_version1;
 361 extern struct svc_version nfs4_callback_version4;
 362
 363 #else
 364
 365 #define nfs4_close_state(a, b) do { } while (0)
 366 #define nfs4_close_sync(a, b) do { } while (0)
 367
 368 #endif /* CONFIG_NFS_V4 */
 369 #endif /* __LINUX_FS_NFS_NFS4_FS.H */