linux/fs/nfs/nfs4_fs.h
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   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
  14struct idmap;
  15
  16enum 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
  31enum 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
  39struct 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
  58struct 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
  68struct nfs_seqid {
  69        struct nfs_seqid_counter *sequence;
  70        struct list_head list;
  71        struct rpc_task *task;
  72};
  73
  74static 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 */
  85struct 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
 100enum {
 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
 121struct 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
 132struct 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 0
 136        unsigned long           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 */
 144enum {
 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
 155struct 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
 179struct nfs4_exception {
 180        long timeout;
 181        int retry;
 182        struct nfs4_state *state;
 183        struct inode *inode;
 184};
 185
 186struct 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        int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 195                struct rpc_cred *);
 196};
 197
 198struct nfs4_state_maintenance_ops {
 199        int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 200        struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 201        int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 202};
 203
 204extern const struct dentry_operations nfs4_dentry_operations;
 205
 206/* dir.c */
 207int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 208                    unsigned, umode_t, int *);
 209
 210/* super.c */
 211extern struct file_system_type nfs4_fs_type;
 212
 213/* nfs4namespace.c */
 214rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
 215struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
 216struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 217                               struct nfs_fh *, struct nfs_fattr *);
 218
 219/* nfs4proc.c */
 220extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 221extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 222extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 223extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 224extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 225extern int nfs4_destroy_clientid(struct nfs_client *clp);
 226extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 227extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 228extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 229extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 230extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 231                                  struct nfs4_fs_locations *, struct page *);
 232extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 233                            struct nfs_fh *, struct nfs_fattr *);
 234extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 235extern int nfs4_release_lockowner(struct nfs4_lock_state *);
 236extern const struct xattr_handler *nfs4_xattr_handlers[];
 237
 238#if defined(CONFIG_NFS_V4_1)
 239static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 240{
 241        return server->nfs_client->cl_session;
 242}
 243
 244extern bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy);
 245extern int nfs4_setup_sequence(const struct nfs_server *server,
 246                struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 247                struct rpc_task *task);
 248extern int nfs41_setup_sequence(struct nfs4_session *session,
 249                struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 250                struct rpc_task *task);
 251extern void nfs4_destroy_session(struct nfs4_session *session);
 252extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 253extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 254extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 255extern int nfs4_init_session(struct nfs_server *server);
 256extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 257                struct nfs_fsinfo *fsinfo);
 258extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 259                                  bool sync);
 260
 261static inline bool
 262is_ds_only_client(struct nfs_client *clp)
 263{
 264        return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 265                EXCHGID4_FLAG_USE_PNFS_DS;
 266}
 267
 268static inline bool
 269is_ds_client(struct nfs_client *clp)
 270{
 271        return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 272}
 273#else /* CONFIG_NFS_v4_1 */
 274static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 275{
 276        return NULL;
 277}
 278
 279static inline int nfs4_setup_sequence(const struct nfs_server *server,
 280                struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 281                struct rpc_task *task)
 282{
 283        return 0;
 284}
 285
 286static inline int nfs4_init_session(struct nfs_server *server)
 287{
 288        return 0;
 289}
 290
 291static inline bool
 292is_ds_only_client(struct nfs_client *clp)
 293{
 294        return false;
 295}
 296
 297static inline bool
 298is_ds_client(struct nfs_client *clp)
 299{
 300        return false;
 301}
 302#endif /* CONFIG_NFS_V4_1 */
 303
 304extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 305
 306extern const u32 nfs4_fattr_bitmap[3];
 307extern const u32 nfs4_statfs_bitmap[2];
 308extern const u32 nfs4_pathconf_bitmap[2];
 309extern const u32 nfs4_fsinfo_bitmap[3];
 310extern const u32 nfs4_fs_locations_bitmap[2];
 311
 312void nfs4_free_client(struct nfs_client *);
 313
 314struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 315
 316/* nfs4renewd.c */
 317extern void nfs4_schedule_state_renewal(struct nfs_client *);
 318extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 319extern void nfs4_kill_renewd(struct nfs_client *);
 320extern void nfs4_renew_state(struct work_struct *);
 321
 322/* nfs4state.c */
 323struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 324struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 325int nfs4_discover_server_trunking(struct nfs_client *clp,
 326                        struct nfs_client **);
 327int nfs40_discover_server_trunking(struct nfs_client *clp,
 328                        struct nfs_client **, struct rpc_cred *);
 329#if defined(CONFIG_NFS_V4_1)
 330struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 331struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 332int nfs41_discover_server_trunking(struct nfs_client *clp,
 333                        struct nfs_client **, struct rpc_cred *);
 334extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 335#else
 336static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 337{
 338}
 339#endif /* CONFIG_NFS_V4_1 */
 340
 341extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 342extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 343extern void nfs4_purge_state_owners(struct nfs_server *);
 344extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 345extern void nfs4_put_open_state(struct nfs4_state *);
 346extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 347extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 348extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 349extern void nfs_inode_find_state_and_recover(struct inode *inode,
 350                const nfs4_stateid *stateid);
 351extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 352extern void nfs4_schedule_state_manager(struct nfs_client *);
 353extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 354extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 355extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 356extern void nfs41_handle_recall_slot(struct nfs_client *clp);
 357extern void nfs41_handle_server_scope(struct nfs_client *,
 358                                      struct nfs41_server_scope **);
 359extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 360extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 361extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 362                fmode_t, const struct nfs_lockowner *);
 363
 364extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 365extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 366extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 367extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 368extern void nfs_release_seqid(struct nfs_seqid *seqid);
 369extern void nfs_free_seqid(struct nfs_seqid *seqid);
 370
 371extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 372
 373extern const nfs4_stateid zero_stateid;
 374
 375/* nfs4super.c */
 376struct nfs_mount_info;
 377extern struct nfs_subversion nfs_v4;
 378struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 379extern bool nfs4_disable_idmapping;
 380extern unsigned short max_session_slots;
 381extern unsigned short send_implementation_id;
 382
 383#define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 384extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 385
 386/* nfs4sysctl.c */
 387#ifdef CONFIG_SYSCTL
 388int nfs4_register_sysctl(void);
 389void nfs4_unregister_sysctl(void);
 390#else
 391static inline int nfs4_register_sysctl(void)
 392{
 393        return 0;
 394}
 395
 396static inline void nfs4_unregister_sysctl(void)
 397{
 398}
 399#endif
 400
 401/* nfs4xdr.c */
 402extern struct rpc_procinfo nfs4_procedures[];
 403
 404struct nfs4_mount_data;
 405
 406/* callback_xdr.c */
 407extern struct svc_version nfs4_callback_version1;
 408extern struct svc_version nfs4_callback_version4;
 409
 410static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 411{
 412        memcpy(dst, src, sizeof(*dst));
 413}
 414
 415static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 416{
 417        return memcmp(dst, src, sizeof(*dst)) == 0;
 418}
 419
 420#else
 421
 422#define nfs4_close_state(a, b) do { } while (0)
 423#define nfs4_close_sync(a, b) do { } while (0)
 424
 425#endif /* CONFIG_NFS_V4 */
 426#endif /* __LINUX_FS_NFS_NFS4_FS.H */
 427
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