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)
16 enum nfs4_client_state {
17 NFS4CLNT_MANAGER_RUNNING = 0,
19 NFS4CLNT_LEASE_EXPIRED,
20 NFS4CLNT_RECLAIM_REBOOT,
21 NFS4CLNT_RECLAIM_NOGRACE,
23 NFS4CLNT_SESSION_RESET,
25 NFS4CLNT_LEASE_CONFIRM,
26 NFS4CLNT_SERVER_SCOPE_MISMATCH,
28 NFS4CLNT_BIND_CONN_TO_SESSION,
31 enum nfs4_session_state {
33 NFS4_SESSION_DRAINING,
36 #define NFS4_RENEW_TIMEOUT 0x01
37 #define NFS4_RENEW_DELEGATION_CB 0x02
39 struct nfs4_minor_version_ops {
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,
48 bool (*match_stateid)(const nfs4_stateid *,
49 const nfs4_stateid *);
50 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
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;
57 #define NFS_SEQID_CONFIRMED 1
58 struct nfs_seqid_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 */
69 struct nfs_seqid_counter *sequence;
70 struct list_head list;
71 struct rpc_task *task;
74 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
76 if (seqid_mutating_err(-status))
77 seqid->flags |= NFS_SEQID_CONFIRMED;
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.
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;
91 struct rpc_cred *so_cred; /* Associated cred */
95 unsigned long so_flags;
96 struct list_head so_states;
97 struct nfs_seqid_counter so_seqid;
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 1
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_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 */
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 */
160 struct nfs4_state_owner *owner; /* Pointer to the open owner */
161 struct inode *inode; /* Pointer to the inode */
163 unsigned long flags; /* Do we hold any locks? */
164 spinlock_t state_lock; /* Protects the lock_states list */
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 */
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) */
179 struct nfs4_exception {
182 struct nfs4_state *state;
186 struct nfs4_state_recovery_ops {
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 *);
196 struct nfs4_state_maintenance_ops {
197 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
198 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
199 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
202 extern const struct dentry_operations nfs4_dentry_operations;
205 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
206 unsigned, umode_t, int *);
209 extern struct file_system_type nfs4_fs_type;
211 /* nfs4namespace.c */
212 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
213 struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
214 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
215 struct nfs_fh *, struct nfs_fattr *);
218 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
219 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
220 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
221 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
222 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
223 extern int nfs4_destroy_clientid(struct nfs_client *clp);
224 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
225 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
226 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
227 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
228 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
229 struct nfs4_fs_locations *, struct page *);
230 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
231 struct nfs_fh *, struct nfs_fattr *);
232 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
233 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
234 extern const struct xattr_handler *nfs4_xattr_handlers[];
236 #if defined(CONFIG_NFS_V4_1)
237 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
239 return server->nfs_client->cl_session;
242 extern bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy);
243 extern int nfs4_setup_sequence(const struct nfs_server *server,
244 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
245 struct rpc_task *task);
246 extern int nfs41_setup_sequence(struct nfs4_session *session,
247 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
248 struct rpc_task *task);
249 extern void nfs4_destroy_session(struct nfs4_session *session);
250 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
251 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
252 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
253 extern int nfs4_init_session(struct nfs_server *server);
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)
284 static inline int nfs4_init_session(struct nfs_server *server)
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_renew_cred_locked(struct nfs_client *clp);
323 #if defined(CONFIG_NFS_V4_1)
324 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
325 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
326 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
328 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
331 #endif /* CONFIG_NFS_V4_1 */
333 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
334 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
335 extern void nfs4_purge_state_owners(struct nfs_server *);
336 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
337 extern void nfs4_put_open_state(struct nfs4_state *);
338 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
339 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
340 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
341 extern void nfs_inode_find_state_and_recover(struct inode *inode,
342 const nfs4_stateid *stateid);
343 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
344 extern void nfs4_schedule_state_manager(struct nfs_client *);
345 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
346 extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
347 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
348 extern void nfs41_handle_recall_slot(struct nfs_client *clp);
349 extern void nfs41_handle_server_scope(struct nfs_client *,
350 struct nfs41_server_scope **);
351 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
352 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
353 extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
354 fmode_t, fl_owner_t, pid_t);
356 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
357 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
358 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
359 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
360 extern void nfs_release_seqid(struct nfs_seqid *seqid);
361 extern void nfs_free_seqid(struct nfs_seqid *seqid);
363 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
365 extern const nfs4_stateid zero_stateid;
368 struct nfs_mount_info;
369 extern struct nfs_subversion nfs_v4;
370 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
371 extern bool nfs4_disable_idmapping;
372 extern unsigned short max_session_slots;
373 extern unsigned short send_implementation_id;
377 int nfs4_register_sysctl(void);
378 void nfs4_unregister_sysctl(void);
380 static inline int nfs4_register_sysctl(void)
385 static inline void nfs4_unregister_sysctl(void)
391 extern struct rpc_procinfo nfs4_procedures[];
393 struct nfs4_mount_data;
396 extern struct svc_version nfs4_callback_version1;
397 extern struct svc_version nfs4_callback_version4;
399 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
401 memcpy(dst, src, sizeof(*dst));
404 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
406 return memcmp(dst, src, sizeof(*dst)) == 0;
411 #define nfs4_close_state(a, b) do { } while (0)
412 #define nfs4_close_sync(a, b) do { } while (0)
414 #endif /* CONFIG_NFS_V4 */
415 #endif /* __LINUX_FS_NFS_NFS4_FS.H */