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
17 * In a seqid-mutating op, this macro controls which error return
18 * values trigger incrementation of the seqid.
21 * The client MUST monotonically increment the sequence number for the
22 * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
23 * operations. This is true even in the event that the previous
24 * operation that used the sequence number received an error. The only
25 * exception to this rule is if the previous operation received one of
26 * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
27 * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
28 * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
31 #define seqid_mutating_err(err) \
32 (((err) != NFSERR_STALE_CLIENTID) && \
33 ((err) != NFSERR_STALE_STATEID) && \
34 ((err) != NFSERR_BAD_STATEID) && \
35 ((err) != NFSERR_BAD_SEQID) && \
36 ((err) != NFSERR_BAD_XDR) && \
37 ((err) != NFSERR_RESOURCE) && \
38 ((err) != NFSERR_NOFILEHANDLE))
40 enum nfs4_client_state {
41 NFS4CLNT_MANAGER_RUNNING = 0,
43 NFS4CLNT_LEASE_EXPIRED,
44 NFS4CLNT_RECLAIM_REBOOT,
45 NFS4CLNT_RECLAIM_NOGRACE,
47 NFS4CLNT_SESSION_RESET,
51 enum nfs4_session_state {
53 NFS4_SESSION_DRAINING,
56 struct nfs4_minor_version_ops {
59 int (*call_sync)(struct nfs_server *server,
60 struct rpc_message *msg,
61 struct nfs4_sequence_args *args,
62 struct nfs4_sequence_res *res,
64 int (*validate_stateid)(struct nfs_delegation *,
65 const nfs4_stateid *);
66 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
67 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
68 const struct nfs4_state_maintenance_ops *state_renewal_ops;
72 * struct rpc_sequence ensures that RPC calls are sent in the exact
73 * order that they appear on the list.
76 struct rpc_wait_queue wait; /* RPC call delay queue */
77 spinlock_t lock; /* Protects the list */
78 struct list_head list; /* Defines sequence of RPC calls */
81 #define NFS_SEQID_CONFIRMED 1
82 struct nfs_seqid_counter {
83 struct rpc_sequence *sequence;
89 struct nfs_seqid_counter *sequence;
90 struct list_head list;
93 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
95 if (seqid_mutating_err(-status))
96 seqid->flags |= NFS_SEQID_CONFIRMED;
99 struct nfs_unique_id {
100 struct rb_node rb_node;
105 * NFS4 state_owners and lock_owners are simply labels for ordered
106 * sequences of RPC calls. Their sole purpose is to provide once-only
107 * semantics by allowing the server to identify replayed requests.
109 struct nfs4_state_owner {
110 struct nfs_unique_id so_owner_id;
111 struct nfs_server *so_server;
112 struct rb_node so_client_node;
114 struct rpc_cred *so_cred; /* Associated cred */
118 unsigned long so_flags;
119 struct list_head so_states;
120 struct nfs_seqid_counter so_seqid;
121 struct rpc_sequence so_sequence;
125 NFS_OWNER_RECLAIM_REBOOT,
126 NFS_OWNER_RECLAIM_NOGRACE
129 #define NFS_LOCK_NEW 0
130 #define NFS_LOCK_RECLAIM 1
131 #define NFS_LOCK_EXPIRED 2
134 * struct nfs4_state maintains the client-side state for a given
135 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
138 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
139 * we need to know how many files are open for reading or writing on a
140 * given inode. This information too is stored here.
142 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
145 struct nfs4_lock_owner {
146 unsigned int lo_type;
147 #define NFS4_ANY_LOCK_TYPE (0U)
148 #define NFS4_FLOCK_LOCK_TYPE (1U << 0)
149 #define NFS4_POSIX_LOCK_TYPE (1U << 1)
151 fl_owner_t posix_owner;
156 struct nfs4_lock_state {
157 struct list_head ls_locks; /* Other lock stateids */
158 struct nfs4_state * ls_state; /* Pointer to open state */
159 #define NFS_LOCK_INITIALIZED 1
161 struct nfs_seqid_counter ls_seqid;
162 struct rpc_sequence ls_sequence;
163 struct nfs_unique_id ls_id;
164 nfs4_stateid ls_stateid;
166 struct nfs4_lock_owner ls_owner;
169 /* bits for nfs4_state->flags */
172 NFS_DELEGATED_STATE, /* Current stateid is delegation */
173 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
174 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
175 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
176 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
177 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
178 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
182 struct list_head open_states; /* List of states for the same state_owner */
183 struct list_head inode_states; /* List of states for the same inode */
184 struct list_head lock_states; /* List of subservient lock stateids */
186 struct nfs4_state_owner *owner; /* Pointer to the open owner */
187 struct inode *inode; /* Pointer to the inode */
189 unsigned long flags; /* Do we hold any locks? */
190 spinlock_t state_lock; /* Protects the lock_states list */
192 seqlock_t seqlock; /* Protects the stateid/open_stateid */
193 nfs4_stateid stateid; /* Current stateid: may be delegation */
194 nfs4_stateid open_stateid; /* OPEN stateid */
196 /* The following 3 fields are protected by owner->so_lock */
197 unsigned int n_rdonly; /* Number of read-only references */
198 unsigned int n_wronly; /* Number of write-only references */
199 unsigned int n_rdwr; /* Number of read/write references */
200 fmode_t state; /* State on the server (R,W, or RW) */
205 struct nfs4_exception {
208 struct nfs4_state *state;
211 struct nfs4_state_recovery_ops {
214 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
215 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
216 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
217 struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
218 int (*reclaim_complete)(struct nfs_client *);
221 struct nfs4_state_maintenance_ops {
222 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *);
223 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
224 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
227 extern const struct dentry_operations nfs4_dentry_operations;
228 extern const struct inode_operations nfs4_dir_inode_operations;
231 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
232 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
233 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
237 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
238 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
239 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
240 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
241 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
242 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
243 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
244 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait);
245 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
246 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
247 struct nfs4_fs_locations *fs_locations, struct page *page);
248 extern void nfs4_release_lockowner(const struct nfs4_lock_state *);
250 #if defined(CONFIG_NFS_V4_1)
251 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
253 return server->nfs_client->cl_session;
256 extern int nfs4_setup_sequence(const struct nfs_server *server,
257 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
258 int cache_reply, struct rpc_task *task);
259 extern void nfs4_destroy_session(struct nfs4_session *session);
260 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
261 extern int nfs4_proc_create_session(struct nfs_client *);
262 extern int nfs4_proc_destroy_session(struct nfs4_session *);
263 extern int nfs4_init_session(struct nfs_server *server);
264 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
265 struct nfs_fsinfo *fsinfo);
266 #else /* CONFIG_NFS_v4_1 */
267 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
272 static inline int nfs4_setup_sequence(const struct nfs_server *server,
273 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
274 int cache_reply, struct rpc_task *task)
279 static inline int nfs4_init_session(struct nfs_server *server)
283 #endif /* CONFIG_NFS_V4_1 */
285 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
287 extern const u32 nfs4_fattr_bitmap[2];
288 extern const u32 nfs4_statfs_bitmap[2];
289 extern const u32 nfs4_pathconf_bitmap[2];
290 extern const u32 nfs4_fsinfo_bitmap[2];
291 extern const u32 nfs4_fs_locations_bitmap[2];
294 extern void nfs4_schedule_state_renewal(struct nfs_client *);
295 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
296 extern void nfs4_kill_renewd(struct nfs_client *);
297 extern void nfs4_renew_state(struct work_struct *);
300 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
301 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
302 #if defined(CONFIG_NFS_V4_1)
303 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
304 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
305 #endif /* CONFIG_NFS_V4_1 */
307 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
308 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
309 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
310 extern void nfs4_put_open_state(struct nfs4_state *);
311 extern void nfs4_close_state(struct path *, struct nfs4_state *, fmode_t);
312 extern void nfs4_close_sync(struct path *, struct nfs4_state *, fmode_t);
313 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
314 extern void nfs4_schedule_state_recovery(struct nfs_client *);
315 extern void nfs4_schedule_state_manager(struct nfs_client *);
316 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state);
317 extern int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state);
318 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
319 extern void nfs41_handle_recall_slot(struct nfs_client *clp);
320 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
321 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
322 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
324 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
325 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
326 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
327 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
328 extern void nfs_release_seqid(struct nfs_seqid *seqid);
329 extern void nfs_free_seqid(struct nfs_seqid *seqid);
331 extern const nfs4_stateid zero_stateid;
334 extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
335 extern struct rpc_procinfo nfs4_procedures[];
337 struct nfs4_mount_data;
340 extern struct svc_version nfs4_callback_version1;
341 extern struct svc_version nfs4_callback_version4;
345 #define nfs4_close_state(a, b, c) do { } while (0)
346 #define nfs4_close_sync(a, b, c) do { } while (0)
348 #endif /* CONFIG_NFS_V4 */
349 #endif /* __LINUX_FS_NFS_NFS4_FS.H */