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 {
52 NFS4_SESSION_DRAINING,
56 * struct rpc_sequence ensures that RPC calls are sent in the exact
57 * order that they appear on the list.
60 struct rpc_wait_queue wait; /* RPC call delay queue */
61 spinlock_t lock; /* Protects the list */
62 struct list_head list; /* Defines sequence of RPC calls */
65 #define NFS_SEQID_CONFIRMED 1
66 struct nfs_seqid_counter {
67 struct rpc_sequence *sequence;
73 struct nfs_seqid_counter *sequence;
74 struct list_head list;
77 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
79 if (seqid_mutating_err(-status))
80 seqid->flags |= NFS_SEQID_CONFIRMED;
83 struct nfs_unique_id {
84 struct rb_node rb_node;
89 * NFS4 state_owners and lock_owners are simply labels for ordered
90 * sequences of RPC calls. Their sole purpose is to provide once-only
91 * semantics by allowing the server to identify replayed requests.
93 struct nfs4_state_owner {
94 struct nfs_unique_id so_owner_id;
95 struct nfs_client *so_client;
96 struct nfs_server *so_server;
97 struct rb_node so_client_node;
99 struct rpc_cred *so_cred; /* Associated cred */
103 unsigned long so_flags;
104 struct list_head so_states;
105 struct list_head so_delegations;
106 struct nfs_seqid_counter so_seqid;
107 struct rpc_sequence so_sequence;
111 NFS_OWNER_RECLAIM_REBOOT,
112 NFS_OWNER_RECLAIM_NOGRACE
115 #define NFS_LOCK_NEW 0
116 #define NFS_LOCK_RECLAIM 1
117 #define NFS_LOCK_EXPIRED 2
120 * struct nfs4_state maintains the client-side state for a given
121 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
124 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
125 * we need to know how many files are open for reading or writing on a
126 * given inode. This information too is stored here.
128 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
131 struct nfs4_lock_state {
132 struct list_head ls_locks; /* Other lock stateids */
133 struct nfs4_state * ls_state; /* Pointer to open state */
134 fl_owner_t ls_owner; /* POSIX lock owner */
135 #define NFS_LOCK_INITIALIZED 1
137 struct nfs_seqid_counter ls_seqid;
138 struct rpc_sequence ls_sequence;
139 struct nfs_unique_id ls_id;
140 nfs4_stateid ls_stateid;
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;
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 *);
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;
203 extern const struct inode_operations nfs4_dir_inode_operations;
206 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
207 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
208 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
212 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
213 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
214 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
215 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
216 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
217 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
218 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
219 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait);
220 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
221 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
222 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
223 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
224 struct nfs4_fs_locations *fs_locations, struct page *page);
226 extern struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[];
227 extern struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[];
228 #if defined(CONFIG_NFS_V4_1)
229 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
231 return server->nfs_client->cl_session;
234 extern int nfs4_setup_sequence(const struct nfs_server *server,
235 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
236 int cache_reply, struct rpc_task *task);
237 extern void nfs4_destroy_session(struct nfs4_session *session);
238 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
239 extern int nfs4_proc_create_session(struct nfs_client *);
240 extern int nfs4_proc_destroy_session(struct nfs4_session *);
241 extern int nfs4_init_session(struct nfs_server *server);
242 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
243 struct nfs_fsinfo *fsinfo);
244 #else /* CONFIG_NFS_v4_1 */
245 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
250 static inline int nfs4_setup_sequence(const struct nfs_server *server,
251 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
252 int cache_reply, struct rpc_task *task)
257 static inline int nfs4_init_session(struct nfs_server *server)
261 #endif /* CONFIG_NFS_V4_1 */
263 extern struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[];
265 extern const u32 nfs4_fattr_bitmap[2];
266 extern const u32 nfs4_statfs_bitmap[2];
267 extern const u32 nfs4_pathconf_bitmap[2];
268 extern const u32 nfs4_fsinfo_bitmap[2];
269 extern const u32 nfs4_fs_locations_bitmap[2];
272 extern void nfs4_schedule_state_renewal(struct nfs_client *);
273 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
274 extern void nfs4_kill_renewd(struct nfs_client *);
275 extern void nfs4_renew_state(struct work_struct *);
278 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
279 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
280 #if defined(CONFIG_NFS_V4_1)
281 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
282 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
283 #endif /* CONFIG_NFS_V4_1 */
285 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
286 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
287 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
288 extern void nfs4_put_open_state(struct nfs4_state *);
289 extern void nfs4_close_state(struct path *, struct nfs4_state *, fmode_t);
290 extern void nfs4_close_sync(struct path *, struct nfs4_state *, fmode_t);
291 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
292 extern void nfs4_schedule_state_recovery(struct nfs_client *);
293 extern void nfs4_schedule_state_manager(struct nfs_client *);
294 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state);
295 extern int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state);
296 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
297 extern void nfs41_handle_recall_slot(struct nfs_client *clp);
298 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
299 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
300 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
302 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
303 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
304 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
305 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
306 extern void nfs_release_seqid(struct nfs_seqid *seqid);
307 extern void nfs_free_seqid(struct nfs_seqid *seqid);
309 extern const nfs4_stateid zero_stateid;
312 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
313 extern struct rpc_procinfo nfs4_procedures[];
315 struct nfs4_mount_data;
318 extern struct svc_version nfs4_callback_version1;
319 extern struct svc_version nfs4_callback_version4;
323 #define nfs4_close_state(a, b, c) do { } while (0)
324 #define nfs4_close_sync(a, b, c) do { } while (0)
326 #endif /* CONFIG_NFS_V4 */
327 #endif /* __LINUX_FS_NFS_NFS4_FS.H */