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 /*
  17  * In a seqid-mutating op, this macro controls which error return
  18  * values trigger incrementation of the seqid.
  19  *
  20  * from rfc 3010:
  21  * The client MUST monotonically increment the sequence number for the
  22  * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
  23  * operations.  This is true even in the event that the previous
  24  * operation that used the sequence number received an error.  The only
  25  * exception to this rule is if the previous operation received one of
  26  * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
  27  * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
  28  * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
  29  *
  30  */
  31 #define seqid_mutating_err(err)       \
  32 (((err) != NFSERR_STALE_CLIENTID) &&  \
  33  ((err) != NFSERR_STALE_STATEID)  &&  \
  34  ((err) != NFSERR_BAD_STATEID)    &&  \
  35  ((err) != NFSERR_BAD_SEQID)      &&  \
  36  ((err) != NFSERR_BAD_XDR)        &&  \
  37  ((err) != NFSERR_RESOURCE)       &&  \
  38  ((err) != NFSERR_NOFILEHANDLE))
  39
  40 enum nfs4_client_state {
  41         NFS4CLNT_MANAGER_RUNNING  = 0,
  42         NFS4CLNT_CHECK_LEASE,
  43         NFS4CLNT_LEASE_EXPIRED,
  44         NFS4CLNT_RECLAIM_REBOOT,
  45         NFS4CLNT_RECLAIM_NOGRACE,
  46         NFS4CLNT_DELEGRETURN,
  47         NFS4CLNT_LAYOUTRECALL,
  48         NFS4CLNT_SESSION_RESET,
  49         NFS4CLNT_RECALL_SLOT,
  50         NFS4CLNT_LEASE_CONFIRM,
  51 };
  52
  53 enum nfs4_session_state {
  54         NFS4_SESSION_INITING,
  55         NFS4_SESSION_DRAINING,
  56 };
  57
  58 struct nfs4_minor_version_ops {
  59         u32     minor_version;
  60
  61         int     (*call_sync)(struct rpc_clnt *clnt,
  62                         struct nfs_server *server,
  63                         struct rpc_message *msg,
  64                         struct nfs4_sequence_args *args,
  65                         struct nfs4_sequence_res *res,
  66                         int cache_reply);
  67         int     (*validate_stateid)(struct nfs_delegation *,
  68                         const nfs4_stateid *);
  69         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  70         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  71         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  72 };
  73
  74 /*
  75  * struct rpc_sequence ensures that RPC calls are sent in the exact
  76  * order that they appear on the list.
  77  */
  78 struct rpc_sequence {
  79         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  80         spinlock_t lock;                /* Protects the list */
  81         struct list_head list;          /* Defines sequence of RPC calls */
  82 };
  83
  84 #define NFS_SEQID_CONFIRMED 1
  85 struct nfs_seqid_counter {
  86         struct rpc_sequence *sequence;
  87         int flags;
  88         u32 counter;
  89 };
  90
  91 struct nfs_seqid {
  92         struct nfs_seqid_counter *sequence;
  93         struct list_head list;
  94 };
  95
  96 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  97 {
  98         if (seqid_mutating_err(-status))
  99                 seqid->flags |= NFS_SEQID_CONFIRMED;
 100 }
 101
 102 struct nfs_unique_id {
 103         struct rb_node rb_node;
 104         __u64 id;
 105 };
 106
 107 /*
 108  * NFS4 state_owners and lock_owners are simply labels for ordered
 109  * sequences of RPC calls. Their sole purpose is to provide once-only
 110  * semantics by allowing the server to identify replayed requests.
 111  */
 112 struct nfs4_state_owner {
 113         struct nfs_unique_id so_owner_id;
 114         struct nfs_server    *so_server;
 115         struct rb_node       so_server_node;
 116
 117         struct rpc_cred      *so_cred;   /* Associated cred */
 118
 119         spinlock_t           so_lock;
 120         atomic_t             so_count;
 121         unsigned long        so_flags;
 122         struct list_head     so_states;
 123         struct nfs_seqid_counter so_seqid;
 124         struct rpc_sequence  so_sequence;
 125 };
 126
 127 enum {
 128         NFS_OWNER_RECLAIM_REBOOT,
 129         NFS_OWNER_RECLAIM_NOGRACE
 130 };
 131
 132 #define NFS_LOCK_NEW            0
 133 #define NFS_LOCK_RECLAIM        1
 134 #define NFS_LOCK_EXPIRED        2
 135
 136 /*
 137  * struct nfs4_state maintains the client-side state for a given
 138  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 139  *
 140  * OPEN:
 141  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 142  * we need to know how many files are open for reading or writing on a
 143  * given inode. This information too is stored here.
 144  *
 145  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 146  */
 147
 148 struct nfs4_lock_owner {
 149         unsigned int lo_type;
 150 #define NFS4_ANY_LOCK_TYPE      (0U)
 151 #define NFS4_FLOCK_LOCK_TYPE    (1U << 0)
 152 #define NFS4_POSIX_LOCK_TYPE    (1U << 1)
 153         union {
 154                 fl_owner_t posix_owner;
 155                 pid_t flock_owner;
 156         } lo_u;
 157 };
 158
 159 struct nfs4_lock_state {
 160         struct list_head        ls_locks;       /* Other lock stateids */
 161         struct nfs4_state *     ls_state;       /* Pointer to open state */
 162 #define NFS_LOCK_INITIALIZED 1
 163         int                     ls_flags;
 164         struct nfs_seqid_counter        ls_seqid;
 165         struct rpc_sequence     ls_sequence;
 166         struct nfs_unique_id    ls_id;
 167         nfs4_stateid            ls_stateid;
 168         atomic_t                ls_count;
 169         struct nfs4_lock_owner  ls_owner;
 170 };
 171
 172 /* bits for nfs4_state->flags */
 173 enum {
 174         LK_STATE_IN_USE,
 175         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 176         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 177         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 178         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 179         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 180         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 181         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 182 };
 183
 184 struct nfs4_state {
 185         struct list_head open_states;   /* List of states for the same state_owner */
 186         struct list_head inode_states;  /* List of states for the same inode */
 187         struct list_head lock_states;   /* List of subservient lock stateids */
 188
 189         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 190         struct inode *inode;            /* Pointer to the inode */
 191
 192         unsigned long flags;            /* Do we hold any locks? */
 193         spinlock_t state_lock;          /* Protects the lock_states list */
 194
 195         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 196         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 197         nfs4_stateid open_stateid;      /* OPEN stateid */
 198
 199         /* The following 3 fields are protected by owner->so_lock */
 200         unsigned int n_rdonly;          /* Number of read-only references */
 201         unsigned int n_wronly;          /* Number of write-only references */
 202         unsigned int n_rdwr;            /* Number of read/write references */
 203         fmode_t state;                  /* State on the server (R,W, or RW) */
 204         atomic_t count;
 205 };
 206
 207
 208 struct nfs4_exception {
 209         long timeout;
 210         int retry;
 211         struct nfs4_state *state;
 212         struct inode *inode;
 213 };
 214
 215 struct nfs4_state_recovery_ops {
 216         int owner_flag_bit;
 217         int state_flag_bit;
 218         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 219         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 220         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 221         struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
 222         int (*reclaim_complete)(struct nfs_client *);
 223 };
 224
 225 struct nfs4_state_maintenance_ops {
 226         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *);
 227         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 228         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 229 };
 230
 231 extern const struct dentry_operations nfs4_dentry_operations;
 232 extern const struct inode_operations nfs4_dir_inode_operations;
 233
 234 /* nfs4proc.c */
 235 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 236 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 237 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 238 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
 239 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
 240 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 241 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 242 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
 243 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 244 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 245                 struct nfs4_fs_locations *fs_locations, struct page *page);
 246 extern void nfs4_release_lockowner(const struct nfs4_lock_state *);
 247 extern const struct xattr_handler *nfs4_xattr_handlers[];
 248
 249 #if defined(CONFIG_NFS_V4_1)
 250 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 251 {
 252         return server->nfs_client->cl_session;
 253 }
 254
 255 extern int nfs4_setup_sequence(const struct nfs_server *server,
 256                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 257                 int cache_reply, struct rpc_task *task);
 258 extern int nfs41_setup_sequence(struct nfs4_session *session,
 259                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 260                 int cache_reply, struct rpc_task *task);
 261 extern void nfs4_destroy_session(struct nfs4_session *session);
 262 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 263 extern int nfs4_proc_create_session(struct nfs_client *);
 264 extern int nfs4_proc_destroy_session(struct nfs4_session *);
 265 extern int nfs4_init_session(struct nfs_server *server);
 266 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 267                 struct nfs_fsinfo *fsinfo);
 268 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 269                                   bool sync);
 270
 271 static inline bool
 272 is_ds_only_client(struct nfs_client *clp)
 273 {
 274         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 275                 EXCHGID4_FLAG_USE_PNFS_DS;
 276 }
 277
 278 static inline bool
 279 is_ds_client(struct nfs_client *clp)
 280 {
 281         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 282 }
 283 #else /* CONFIG_NFS_v4_1 */
 284 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 285 {
 286         return NULL;
 287 }
 288
 289 static inline int nfs4_setup_sequence(const struct nfs_server *server,
 290                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 291                 int cache_reply, struct rpc_task *task)
 292 {
 293         return 0;
 294 }
 295
 296 static inline int nfs4_init_session(struct nfs_server *server)
 297 {
 298         return 0;
 299 }
 300
 301 static inline bool
 302 is_ds_only_client(struct nfs_client *clp)
 303 {
 304         return false;
 305 }
 306
 307 static inline bool
 308 is_ds_client(struct nfs_client *clp)
 309 {
 310         return false;
 311 }
 312 #endif /* CONFIG_NFS_V4_1 */
 313
 314 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 315
 316 extern const u32 nfs4_fattr_bitmap[2];
 317 extern const u32 nfs4_statfs_bitmap[2];
 318 extern const u32 nfs4_pathconf_bitmap[2];
 319 extern const u32 nfs4_fsinfo_bitmap[2];
 320 extern const u32 nfs4_fs_locations_bitmap[2];
 321
 322 /* nfs4renewd.c */
 323 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 324 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 325 extern void nfs4_kill_renewd(struct nfs_client *);
 326 extern void nfs4_renew_state(struct work_struct *);
 327
 328 /* nfs4state.c */
 329 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 330 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 331 #if defined(CONFIG_NFS_V4_1)
 332 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 333 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 334 extern void nfs4_schedule_session_recovery(struct nfs4_session *);
 335 #else
 336 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session)
 337 {
 338 }
 339 #endif /* CONFIG_NFS_V4_1 */
 340
 341 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 342 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 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 path *, struct nfs4_state *, fmode_t);
 346 extern void nfs4_close_sync(struct path *, 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 void nfs4_schedule_state_manager(struct nfs_client *);
 352 extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 353 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 354 extern void nfs41_handle_recall_slot(struct nfs_client *clp);
 355 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 356 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 357 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
 358
 359 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 360 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 361 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 362 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 363 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 364 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 365
 366 extern const nfs4_stateid zero_stateid;
 367
 368 /* nfs4xdr.c */
 369 extern struct rpc_procinfo nfs4_procedures[];
 370
 371 struct nfs4_mount_data;
 372
 373 /* callback_xdr.c */
 374 extern struct svc_version nfs4_callback_version1;
 375 extern struct svc_version nfs4_callback_version4;
 376
 377 #else
 378
 379 #define nfs4_close_state(a, b, c) do { } while (0)
 380 #define nfs4_close_sync(a, b, c) do { } while (0)
 381
 382 #endif /* CONFIG_NFS_V4 */
 383 #endif /* __LINUX_FS_NFS_NFS4_FS.H */