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