2 * linux/fs/nfs/nfs4_fs.h
4 * Copyright (C) 2005 Trond Myklebust
6 * NFSv4-specific filesystem definitions and declarations
9 #ifndef __LINUX_FS_NFS_NFS4_FS_H
10 #define __LINUX_FS_NFS_NFS4_FS_H
12 #if IS_ENABLED(CONFIG_NFS_V4)
14 #define NFS4_MAX_LOOP_ON_RECOVER (10)
18 enum nfs4_client_state {
19 NFS4CLNT_MANAGER_RUNNING = 0,
21 NFS4CLNT_LEASE_EXPIRED,
22 NFS4CLNT_RECLAIM_REBOOT,
23 NFS4CLNT_RECLAIM_NOGRACE,
25 NFS4CLNT_SESSION_RESET,
26 NFS4CLNT_LEASE_CONFIRM,
27 NFS4CLNT_SERVER_SCOPE_MISMATCH,
29 NFS4CLNT_BIND_CONN_TO_SESSION,
32 enum nfs4_session_state {
34 NFS4_SESSION_DRAINING,
37 #define NFS4_RENEW_TIMEOUT 0x01
38 #define NFS4_RENEW_DELEGATION_CB 0x02
40 struct nfs4_minor_version_ops {
43 int (*call_sync)(struct rpc_clnt *clnt,
44 struct nfs_server *server,
45 struct rpc_message *msg,
46 struct nfs4_sequence_args *args,
47 struct nfs4_sequence_res *res,
49 bool (*match_stateid)(const nfs4_stateid *,
50 const nfs4_stateid *);
51 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
53 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
54 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
55 const struct nfs4_state_maintenance_ops *state_renewal_ops;
58 #define NFS_SEQID_CONFIRMED 1
59 struct nfs_seqid_counter {
64 spinlock_t lock; /* Protects the list */
65 struct list_head list; /* Defines sequence of RPC calls */
66 struct rpc_wait_queue wait; /* RPC call delay queue */
70 struct nfs_seqid_counter *sequence;
71 struct list_head list;
72 struct rpc_task *task;
75 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
77 if (seqid_mutating_err(-status))
78 seqid->flags |= NFS_SEQID_CONFIRMED;
82 * NFS4 state_owners and lock_owners are simply labels for ordered
83 * sequences of RPC calls. Their sole purpose is to provide once-only
84 * semantics by allowing the server to identify replayed requests.
86 struct nfs4_state_owner {
87 struct nfs_server *so_server;
88 struct list_head so_lru;
89 unsigned long so_expires;
90 struct rb_node so_server_node;
92 struct rpc_cred *so_cred; /* Associated cred */
96 unsigned long so_flags;
97 struct list_head so_states;
98 struct nfs_seqid_counter so_seqid;
102 NFS_OWNER_RECLAIM_REBOOT,
103 NFS_OWNER_RECLAIM_NOGRACE
106 #define NFS_LOCK_NEW 0
107 #define NFS_LOCK_RECLAIM 1
108 #define NFS_LOCK_EXPIRED 2
111 * struct nfs4_state maintains the client-side state for a given
112 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
115 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
116 * we need to know how many files are open for reading or writing on a
117 * given inode. This information too is stored here.
119 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
122 struct nfs4_lock_owner {
123 unsigned int lo_type;
124 #define NFS4_ANY_LOCK_TYPE (0U)
125 #define NFS4_FLOCK_LOCK_TYPE (1U << 0)
126 #define NFS4_POSIX_LOCK_TYPE (1U << 1)
128 fl_owner_t posix_owner;
133 struct nfs4_lock_state {
134 struct list_head ls_locks; /* Other lock stateids */
135 struct nfs4_state * ls_state; /* Pointer to open state */
136 #define NFS_LOCK_INITIALIZED 0
137 unsigned long ls_flags;
138 struct nfs_seqid_counter ls_seqid;
139 nfs4_stateid ls_stateid;
141 struct nfs4_lock_owner ls_owner;
144 /* bits for nfs4_state->flags */
147 NFS_DELEGATED_STATE, /* Current stateid is delegation */
148 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
149 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
150 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
151 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
152 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
153 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
157 struct list_head open_states; /* List of states for the same state_owner */
158 struct list_head inode_states; /* List of states for the same inode */
159 struct list_head lock_states; /* List of subservient lock stateids */
161 struct nfs4_state_owner *owner; /* Pointer to the open owner */
162 struct inode *inode; /* Pointer to the inode */
164 unsigned long flags; /* Do we hold any locks? */
165 spinlock_t state_lock; /* Protects the lock_states list */
167 seqlock_t seqlock; /* Protects the stateid/open_stateid */
168 nfs4_stateid stateid; /* Current stateid: may be delegation */
169 nfs4_stateid open_stateid; /* OPEN stateid */
171 /* The following 3 fields are protected by owner->so_lock */
172 unsigned int n_rdonly; /* Number of read-only references */
173 unsigned int n_wronly; /* Number of write-only references */
174 unsigned int n_rdwr; /* Number of read/write references */
175 fmode_t state; /* State on the server (R,W, or RW) */
180 struct nfs4_exception {
183 struct nfs4_state *state;
187 struct nfs4_state_recovery_ops {
190 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
191 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
192 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
193 struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
194 int (*reclaim_complete)(struct nfs_client *);
195 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
199 struct nfs4_state_maintenance_ops {
200 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
201 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
202 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
205 extern const struct dentry_operations nfs4_dentry_operations;
208 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
209 unsigned, umode_t, int *);
212 extern struct file_system_type nfs4_fs_type;
214 /* nfs4namespace.c */
215 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
216 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
217 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
218 struct nfs_fh *, struct nfs_fattr *);
221 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
222 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
223 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
224 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
225 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
226 extern int nfs4_destroy_clientid(struct nfs_client *clp);
227 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
228 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
229 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
230 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
231 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
232 struct nfs4_fs_locations *, struct page *);
233 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
234 struct nfs_fh *, struct nfs_fattr *);
235 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
236 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
237 extern const struct xattr_handler *nfs4_xattr_handlers[];
239 #if defined(CONFIG_NFS_V4_1)
240 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
242 return server->nfs_client->cl_session;
245 extern bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy);
246 extern int nfs4_setup_sequence(const struct nfs_server *server,
247 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
248 struct rpc_task *task);
249 extern int nfs41_setup_sequence(struct nfs4_session *session,
250 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
251 struct rpc_task *task);
252 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
253 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
254 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
255 struct nfs_fsinfo *fsinfo);
256 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
260 is_ds_only_client(struct nfs_client *clp)
262 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
263 EXCHGID4_FLAG_USE_PNFS_DS;
267 is_ds_client(struct nfs_client *clp)
269 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
271 #else /* CONFIG_NFS_v4_1 */
272 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
277 static inline int nfs4_setup_sequence(const struct nfs_server *server,
278 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
279 struct rpc_task *task)
285 is_ds_only_client(struct nfs_client *clp)
291 is_ds_client(struct nfs_client *clp)
295 #endif /* CONFIG_NFS_V4_1 */
297 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
299 extern const u32 nfs4_fattr_bitmap[3];
300 extern const u32 nfs4_statfs_bitmap[2];
301 extern const u32 nfs4_pathconf_bitmap[2];
302 extern const u32 nfs4_fsinfo_bitmap[3];
303 extern const u32 nfs4_fs_locations_bitmap[2];
305 void nfs4_free_client(struct nfs_client *);
307 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
310 extern void nfs4_schedule_state_renewal(struct nfs_client *);
311 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
312 extern void nfs4_kill_renewd(struct nfs_client *);
313 extern void nfs4_renew_state(struct work_struct *);
316 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
317 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
318 int nfs4_discover_server_trunking(struct nfs_client *clp,
319 struct nfs_client **);
320 int nfs40_discover_server_trunking(struct nfs_client *clp,
321 struct nfs_client **, struct rpc_cred *);
322 #if defined(CONFIG_NFS_V4_1)
323 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
324 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
325 int nfs41_discover_server_trunking(struct nfs_client *clp,
326 struct nfs_client **, struct rpc_cred *);
327 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
328 extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
330 extern void nfs4_session_drain_complete(struct nfs4_session *session,
331 struct nfs4_slot_table *tbl);
333 static inline bool nfs4_session_draining(struct nfs4_session *session)
335 return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state);
338 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
341 #endif /* CONFIG_NFS_V4_1 */
343 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
344 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
345 extern void nfs4_purge_state_owners(struct nfs_server *);
346 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
347 extern void nfs4_put_open_state(struct nfs4_state *);
348 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
349 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
350 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
351 extern void nfs_inode_find_state_and_recover(struct inode *inode,
352 const nfs4_stateid *stateid);
353 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
354 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
355 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
356 extern void nfs4_schedule_state_manager(struct nfs_client *);
357 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
358 extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
359 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
360 extern void nfs41_handle_server_scope(struct nfs_client *,
361 struct nfs41_server_scope **);
362 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
363 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
364 extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
365 fmode_t, const struct nfs_lockowner *);
367 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
368 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
369 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
370 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
371 extern void nfs_release_seqid(struct nfs_seqid *seqid);
372 extern void nfs_free_seqid(struct nfs_seqid *seqid);
374 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
376 extern const nfs4_stateid zero_stateid;
379 struct nfs_mount_info;
380 extern struct nfs_subversion nfs_v4;
381 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
382 extern bool nfs4_disable_idmapping;
383 extern unsigned short max_session_slots;
384 extern unsigned short send_implementation_id;
386 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
387 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
391 int nfs4_register_sysctl(void);
392 void nfs4_unregister_sysctl(void);
394 static inline int nfs4_register_sysctl(void)
399 static inline void nfs4_unregister_sysctl(void)
405 extern struct rpc_procinfo nfs4_procedures[];
407 struct nfs4_mount_data;
410 extern struct svc_version nfs4_callback_version1;
411 extern struct svc_version nfs4_callback_version4;
413 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
415 memcpy(dst, src, sizeof(*dst));
418 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
420 return memcmp(dst, src, sizeof(*dst)) == 0;
425 #define nfs4_close_state(a, b) do { } while (0)
426 #define nfs4_close_sync(a, b) do { } while (0)
428 #endif /* CONFIG_NFS_V4 */
429 #endif /* __LINUX_FS_NFS_NFS4_FS.H */