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 #include <linux/seqlock.h>
  17
  18 struct idmap;
  19
  20 enum nfs4_client_state {
  21         NFS4CLNT_MANAGER_RUNNING  = 0,
  22         NFS4CLNT_CHECK_LEASE,
  23         NFS4CLNT_LEASE_EXPIRED,
  24         NFS4CLNT_RECLAIM_REBOOT,
  25         NFS4CLNT_RECLAIM_NOGRACE,
  26         NFS4CLNT_DELEGRETURN,
  27         NFS4CLNT_SESSION_RESET,
  28         NFS4CLNT_LEASE_CONFIRM,
  29         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  30         NFS4CLNT_PURGE_STATE,
  31         NFS4CLNT_BIND_CONN_TO_SESSION,
  32 };
  33
  34 #define NFS4_RENEW_TIMEOUT              0x01
  35 #define NFS4_RENEW_DELEGATION_CB        0x02
  36
  37 struct nfs4_minor_version_ops {
  38         u32     minor_version;
  39         unsigned init_caps;
  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         bool    (*match_stateid)(const nfs4_stateid *,
  47                         const nfs4_stateid *);
  48         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  49                         struct nfs_fsinfo *);
  50         int     (*free_lock_state)(struct nfs_server *,
  51                         struct nfs4_lock_state *);
  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         seqcount_t           so_reclaim_seqcount;
  99         struct mutex         so_delegreturn_mutex;
 100 };
 101
 102 enum {
 103         NFS_OWNER_RECLAIM_REBOOT,
 104         NFS_OWNER_RECLAIM_NOGRACE
 105 };
 106
 107 #define NFS_LOCK_NEW            0
 108 #define NFS_LOCK_RECLAIM        1
 109 #define NFS_LOCK_EXPIRED        2
 110
 111 /*
 112  * struct nfs4_state maintains the client-side state for a given
 113  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 114  *
 115  * OPEN:
 116  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 117  * we need to know how many files are open for reading or writing on a
 118  * given inode. This information too is stored here.
 119  *
 120  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 121  */
 122
 123 struct nfs4_lock_owner {
 124         unsigned int lo_type;
 125 #define NFS4_ANY_LOCK_TYPE      (0U)
 126 #define NFS4_FLOCK_LOCK_TYPE    (1U << 0)
 127 #define NFS4_POSIX_LOCK_TYPE    (1U << 1)
 128         union {
 129                 fl_owner_t posix_owner;
 130                 pid_t flock_owner;
 131         } lo_u;
 132 };
 133
 134 struct nfs4_lock_state {
 135         struct list_head        ls_locks;       /* Other lock stateids */
 136         struct nfs4_state *     ls_state;       /* Pointer to open state */
 137 #define NFS_LOCK_INITIALIZED 0
 138         unsigned long           ls_flags;
 139         struct nfs_seqid_counter        ls_seqid;
 140         nfs4_stateid            ls_stateid;
 141         atomic_t                ls_count;
 142         struct nfs4_lock_owner  ls_owner;
 143 };
 144
 145 /* bits for nfs4_state->flags */
 146 enum {
 147         LK_STATE_IN_USE,
 148         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 149         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 150         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 151         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 152         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 153         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 154         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 155         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 156         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 157 };
 158
 159 struct nfs4_state {
 160         struct list_head open_states;   /* List of states for the same state_owner */
 161         struct list_head inode_states;  /* List of states for the same inode */
 162         struct list_head lock_states;   /* List of subservient lock stateids */
 163
 164         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 165         struct inode *inode;            /* Pointer to the inode */
 166
 167         unsigned long flags;            /* Do we hold any locks? */
 168         spinlock_t state_lock;          /* Protects the lock_states list */
 169
 170         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 171         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 172         nfs4_stateid open_stateid;      /* OPEN stateid */
 173
 174         /* The following 3 fields are protected by owner->so_lock */
 175         unsigned int n_rdonly;          /* Number of read-only references */
 176         unsigned int n_wronly;          /* Number of write-only references */
 177         unsigned int n_rdwr;            /* Number of read/write references */
 178         fmode_t state;                  /* State on the server (R,W, or RW) */
 179         atomic_t count;
 180 };
 181
 182
 183 struct nfs4_exception {
 184         long timeout;
 185         int retry;
 186         struct nfs4_state *state;
 187         struct inode *inode;
 188 };
 189
 190 struct nfs4_state_recovery_ops {
 191         int owner_flag_bit;
 192         int state_flag_bit;
 193         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 194         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 195         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 196         int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
 197         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 198                 struct rpc_cred *);
 199 };
 200
 201 struct nfs4_state_maintenance_ops {
 202         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 203         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 204         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 205 };
 206
 207 extern const struct dentry_operations nfs4_dentry_operations;
 208
 209 /* dir.c */
 210 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 211                     unsigned, umode_t, int *);
 212
 213 /* super.c */
 214 extern struct file_system_type nfs4_fs_type;
 215
 216 /* nfs4namespace.c */
 217 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
 218 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
 219 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 220                                struct nfs_fh *, struct nfs_fattr *);
 221
 222 /* nfs4proc.c */
 223 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 224 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 225 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 226 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 227 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 228 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 229 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 230 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 231 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 232 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 233 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 234                                   struct nfs4_fs_locations *, struct page *);
 235 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 236                             struct nfs_fh *, struct nfs_fattr *);
 237 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 238 extern const struct xattr_handler *nfs4_xattr_handlers[];
 239 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 240                 const struct nfs_open_context *ctx,
 241                 const struct nfs_lock_context *l_ctx,
 242                 fmode_t fmode);
 243
 244 #if defined(CONFIG_NFS_V4_1)
 245 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 246 {
 247         return server->nfs_client->cl_session;
 248 }
 249
 250 extern int nfs41_setup_sequence(struct nfs4_session *session,
 251                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 252                 struct rpc_task *task);
 253 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 254 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 255 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 256                 struct nfs_fsinfo *fsinfo);
 257 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 258                                   bool sync);
 259
 260 static inline bool
 261 is_ds_only_client(struct nfs_client *clp)
 262 {
 263         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 264                 EXCHGID4_FLAG_USE_PNFS_DS;
 265 }
 266
 267 static inline bool
 268 is_ds_client(struct nfs_client *clp)
 269 {
 270         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 271 }
 272 #else /* CONFIG_NFS_v4_1 */
 273 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 274 {
 275         return NULL;
 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[3];
 295 extern const u32 nfs4_pathconf_bitmap[3];
 296 extern const u32 nfs4_fsinfo_bitmap[3];
 297 extern const u32 nfs4_fs_locations_bitmap[3];
 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_clid_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 int nfs41_discover_server_trunking(struct nfs_client *clp,
 319                         struct nfs_client **, struct rpc_cred *);
 320 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 321 extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
 322 extern void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp);
 323
 324 #else
 325 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 326 {
 327 }
 328 #endif /* CONFIG_NFS_V4_1 */
 329
 330 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 331 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 332 extern void nfs4_purge_state_owners(struct nfs_server *);
 333 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 334 extern void nfs4_put_open_state(struct nfs4_state *);
 335 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 336 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 337 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 338 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 339                 const nfs4_stateid *stateid);
 340 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 341 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 342 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 343 extern void nfs4_schedule_state_manager(struct nfs_client *);
 344 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 345 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 346 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 347 extern void nfs41_handle_server_scope(struct nfs_client *,
 348                                       struct nfs41_server_scope **);
 349 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 350 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 351 extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 352                 fmode_t, const struct nfs_lockowner *);
 353
 354 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 355 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 356 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 357 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 358 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 359 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 360
 361 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 362
 363 extern const nfs4_stateid zero_stateid;
 364
 365 /* nfs4super.c */
 366 struct nfs_mount_info;
 367 extern struct nfs_subversion nfs_v4;
 368 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 369 extern bool nfs4_disable_idmapping;
 370 extern unsigned short max_session_slots;
 371 extern unsigned short send_implementation_id;
 372
 373 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 374 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 375
 376 /* nfs4sysctl.c */
 377 #ifdef CONFIG_SYSCTL
 378 int nfs4_register_sysctl(void);
 379 void nfs4_unregister_sysctl(void);
 380 #else
 381 static inline int nfs4_register_sysctl(void)
 382 {
 383         return 0;
 384 }
 385
 386 static inline void nfs4_unregister_sysctl(void)
 387 {
 388 }
 389 #endif
 390
 391 /* nfs4xdr.c */
 392 extern struct rpc_procinfo nfs4_procedures[];
 393
 394 struct nfs4_mount_data;
 395
 396 /* callback_xdr.c */
 397 extern struct svc_version nfs4_callback_version1;
 398 extern struct svc_version nfs4_callback_version4;
 399
 400 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 401 {
 402         memcpy(dst, src, sizeof(*dst));
 403 }
 404
 405 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 406 {
 407         return memcmp(dst, src, sizeof(*dst)) == 0;
 408 }
 409
 410 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 411 {
 412         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 413 }
 414
 415 #else
 416
 417 #define nfs4_close_state(a, b) do { } while (0)
 418 #define nfs4_close_sync(a, b) do { } while (0)
 419
 420 #endif /* CONFIG_NFS_V4 */
 421 #endif /* __LINUX_FS_NFS_NFS4_FS.H */