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)
16 #include <linux/seqlock.h>
20 enum nfs4_client_state {
21 NFS4CLNT_MANAGER_RUNNING = 0,
23 NFS4CLNT_LEASE_EXPIRED,
24 NFS4CLNT_RECLAIM_REBOOT,
25 NFS4CLNT_RECLAIM_NOGRACE,
27 NFS4CLNT_SESSION_RESET,
28 NFS4CLNT_LEASE_CONFIRM,
29 NFS4CLNT_SERVER_SCOPE_MISMATCH,
31 NFS4CLNT_BIND_CONN_TO_SESSION,
34 #define NFS4_RENEW_TIMEOUT 0x01
35 #define NFS4_RENEW_DELEGATION_CB 0x02
37 struct nfs4_minor_version_ops {
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 *,
50 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
51 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
52 const struct nfs4_state_maintenance_ops *state_renewal_ops;
55 #define NFS_SEQID_CONFIRMED 1
56 struct nfs_seqid_counter {
61 spinlock_t lock; /* Protects the list */
62 struct list_head list; /* Defines sequence of RPC calls */
63 struct rpc_wait_queue wait; /* RPC call delay queue */
67 struct nfs_seqid_counter *sequence;
68 struct list_head list;
69 struct rpc_task *task;
72 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
74 if (seqid_mutating_err(-status))
75 seqid->flags |= NFS_SEQID_CONFIRMED;
79 * NFS4 state_owners and lock_owners are simply labels for ordered
80 * sequences of RPC calls. Their sole purpose is to provide once-only
81 * semantics by allowing the server to identify replayed requests.
83 struct nfs4_state_owner {
84 struct nfs_server *so_server;
85 struct list_head so_lru;
86 unsigned long so_expires;
87 struct rb_node so_server_node;
89 struct rpc_cred *so_cred; /* Associated cred */
93 unsigned long so_flags;
94 struct list_head so_states;
95 struct nfs_seqid_counter so_seqid;
96 seqcount_t so_reclaim_seqcount;
97 struct mutex so_delegreturn_mutex;
101 NFS_OWNER_RECLAIM_REBOOT,
102 NFS_OWNER_RECLAIM_NOGRACE
105 #define NFS_LOCK_NEW 0
106 #define NFS_LOCK_RECLAIM 1
107 #define NFS_LOCK_EXPIRED 2
110 * struct nfs4_state maintains the client-side state for a given
111 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
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.
118 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
121 struct 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)
127 fl_owner_t posix_owner;
132 struct 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;
140 struct nfs4_lock_owner ls_owner;
143 /* bits for nfs4_state->flags */
146 NFS_DELEGATED_STATE, /* Current stateid is delegation */
147 NFS_OPEN_STATE, /* OPEN stateid is set */
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 */
154 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
158 struct list_head open_states; /* List of states for the same state_owner */
159 struct list_head inode_states; /* List of states for the same inode */
160 struct list_head lock_states; /* List of subservient lock stateids */
162 struct nfs4_state_owner *owner; /* Pointer to the open owner */
163 struct inode *inode; /* Pointer to the inode */
165 unsigned long flags; /* Do we hold any locks? */
166 spinlock_t state_lock; /* Protects the lock_states list */
168 seqlock_t seqlock; /* Protects the stateid/open_stateid */
169 nfs4_stateid stateid; /* Current stateid: may be delegation */
170 nfs4_stateid open_stateid; /* OPEN stateid */
172 /* The following 3 fields are protected by owner->so_lock */
173 unsigned int n_rdonly; /* Number of read-only references */
174 unsigned int n_wronly; /* Number of write-only references */
175 unsigned int n_rdwr; /* Number of read/write references */
176 fmode_t state; /* State on the server (R,W, or RW) */
181 struct nfs4_exception {
184 struct nfs4_state *state;
188 struct nfs4_state_recovery_ops {
191 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
192 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
193 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
194 struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
195 int (*reclaim_complete)(struct nfs_client *);
196 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
200 struct nfs4_state_maintenance_ops {
201 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
202 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
203 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
206 extern const struct dentry_operations nfs4_dentry_operations;
209 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
210 unsigned, umode_t, int *);
213 extern struct file_system_type nfs4_fs_type;
215 /* nfs4namespace.c */
216 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
217 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
218 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
219 struct nfs_fh *, struct nfs_fattr *);
222 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
223 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
224 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
225 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
226 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
227 extern int nfs4_destroy_clientid(struct nfs_client *clp);
228 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
229 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
230 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
231 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
232 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
233 struct nfs4_fs_locations *, struct page *);
234 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
235 struct nfs_fh *, struct nfs_fattr *);
236 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
237 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
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,
244 #if defined(CONFIG_NFS_V4_1)
245 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
247 return server->nfs_client->cl_session;
250 extern int nfs4_setup_sequence(const struct nfs_server *server,
251 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
252 struct rpc_task *task);
253 extern int nfs41_setup_sequence(struct nfs4_session *session,
254 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
255 struct rpc_task *task);
256 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
257 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
258 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
259 struct nfs_fsinfo *fsinfo);
260 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
264 is_ds_only_client(struct nfs_client *clp)
266 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
267 EXCHGID4_FLAG_USE_PNFS_DS;
271 is_ds_client(struct nfs_client *clp)
273 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
275 #else /* CONFIG_NFS_v4_1 */
276 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
281 static inline int nfs4_setup_sequence(const struct nfs_server *server,
282 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
283 struct rpc_task *task)
285 rpc_call_start(task);
290 is_ds_only_client(struct nfs_client *clp)
296 is_ds_client(struct nfs_client *clp)
300 #endif /* CONFIG_NFS_V4_1 */
302 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
304 extern const u32 nfs4_fattr_bitmap[3];
305 extern const u32 nfs4_statfs_bitmap[2];
306 extern const u32 nfs4_pathconf_bitmap[2];
307 extern const u32 nfs4_fsinfo_bitmap[3];
308 extern const u32 nfs4_fs_locations_bitmap[2];
310 void nfs4_free_client(struct nfs_client *);
312 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
315 extern void nfs4_schedule_state_renewal(struct nfs_client *);
316 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
317 extern void nfs4_kill_renewd(struct nfs_client *);
318 extern void nfs4_renew_state(struct work_struct *);
321 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
322 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
323 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
324 int nfs4_discover_server_trunking(struct nfs_client *clp,
325 struct nfs_client **);
326 int nfs40_discover_server_trunking(struct nfs_client *clp,
327 struct nfs_client **, struct rpc_cred *);
328 #if defined(CONFIG_NFS_V4_1)
329 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
330 int nfs41_discover_server_trunking(struct nfs_client *clp,
331 struct nfs_client **, struct rpc_cred *);
332 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
333 extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
334 extern void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp);
337 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
340 #endif /* CONFIG_NFS_V4_1 */
342 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
343 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
344 extern void nfs4_purge_state_owners(struct nfs_server *);
345 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
346 extern void nfs4_put_open_state(struct nfs4_state *);
347 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
348 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
349 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
350 extern void nfs_inode_find_state_and_recover(struct inode *inode,
351 const nfs4_stateid *stateid);
352 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
353 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
354 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
355 extern void nfs4_schedule_state_manager(struct nfs_client *);
356 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
357 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
358 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
359 extern void nfs41_handle_server_scope(struct nfs_client *,
360 struct nfs41_server_scope **);
361 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
362 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
363 extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
364 fmode_t, const struct nfs_lockowner *);
366 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
367 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
368 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
369 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
370 extern void nfs_release_seqid(struct nfs_seqid *seqid);
371 extern void nfs_free_seqid(struct nfs_seqid *seqid);
373 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
375 extern const nfs4_stateid zero_stateid;
378 struct nfs_mount_info;
379 extern struct nfs_subversion nfs_v4;
380 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
381 extern bool nfs4_disable_idmapping;
382 extern unsigned short max_session_slots;
383 extern unsigned short send_implementation_id;
385 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
386 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
390 int nfs4_register_sysctl(void);
391 void nfs4_unregister_sysctl(void);
393 static inline int nfs4_register_sysctl(void)
398 static inline void nfs4_unregister_sysctl(void)
404 extern struct rpc_procinfo nfs4_procedures[];
406 struct nfs4_mount_data;
409 extern struct svc_version nfs4_callback_version1;
410 extern struct svc_version nfs4_callback_version4;
412 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
414 memcpy(dst, src, sizeof(*dst));
417 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
419 return memcmp(dst, src, sizeof(*dst)) == 0;
422 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
424 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
429 #define nfs4_close_state(a, b) do { } while (0)
430 #define nfs4_close_sync(a, b) do { } while (0)
432 #endif /* CONFIG_NFS_V4 */
433 #endif /* __LINUX_FS_NFS_NFS4_FS.H */