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 *);
208 /* nfs4namespace.c */
209 rpc_authflavor_t
nfs_find_best_sec(struct nfs4_secinfo_flavors
*);
210 struct rpc_clnt
*nfs4_create_sec_client(struct rpc_clnt
*, struct inode
*, struct qstr
*);
211 struct vfsmount
*nfs4_submount(struct nfs_server
*, struct dentry
*,
212 struct nfs_fh
*, struct nfs_fattr
*);
215 extern int nfs4_proc_setclientid(struct nfs_client
*, u32
, unsigned short, struct rpc_cred
*, struct nfs4_setclientid_res
*);
216 extern int nfs4_proc_setclientid_confirm(struct nfs_client
*, struct nfs4_setclientid_res
*arg
, struct rpc_cred
*);
217 extern int nfs4_proc_get_rootfh(struct nfs_server
*, struct nfs_fh
*, struct nfs_fsinfo
*);
218 extern int nfs4_proc_bind_conn_to_session(struct nfs_client
*, struct rpc_cred
*cred
);
219 extern int nfs4_proc_exchange_id(struct nfs_client
*clp
, struct rpc_cred
*cred
);
220 extern int nfs4_destroy_clientid(struct nfs_client
*clp
);
221 extern int nfs4_init_clientid(struct nfs_client
*, struct rpc_cred
*);
222 extern int nfs41_init_clientid(struct nfs_client
*, struct rpc_cred
*);
223 extern int nfs4_do_close(struct nfs4_state
*state
, gfp_t gfp_mask
, int wait
, bool roc
);
224 extern int nfs4_server_capabilities(struct nfs_server
*server
, struct nfs_fh
*fhandle
);
225 extern int nfs4_proc_fs_locations(struct rpc_clnt
*, struct inode
*, const struct qstr
*,
226 struct nfs4_fs_locations
*, struct page
*);
227 extern struct rpc_clnt
*nfs4_proc_lookup_mountpoint(struct inode
*, struct qstr
*,
228 struct nfs_fh
*, struct nfs_fattr
*);
229 extern int nfs4_proc_secinfo(struct inode
*, const struct qstr
*, struct nfs4_secinfo_flavors
*);
230 extern int nfs4_release_lockowner(struct nfs4_lock_state
*);
231 extern const struct xattr_handler
*nfs4_xattr_handlers
[];
233 #if defined(CONFIG_NFS_V4_1)
234 static inline struct nfs4_session
*nfs4_get_session(const struct nfs_server
*server
)
236 return server
->nfs_client
->cl_session
;
239 extern bool nfs4_set_task_privileged(struct rpc_task
*task
, void *dummy
);
240 extern int nfs4_setup_sequence(const struct nfs_server
*server
,
241 struct nfs4_sequence_args
*args
, struct nfs4_sequence_res
*res
,
242 struct rpc_task
*task
);
243 extern int nfs41_setup_sequence(struct nfs4_session
*session
,
244 struct nfs4_sequence_args
*args
, struct nfs4_sequence_res
*res
,
245 struct rpc_task
*task
);
246 extern void nfs4_destroy_session(struct nfs4_session
*session
);
247 extern struct nfs4_session
*nfs4_alloc_session(struct nfs_client
*clp
);
248 extern int nfs4_proc_create_session(struct nfs_client
*, struct rpc_cred
*);
249 extern int nfs4_proc_destroy_session(struct nfs4_session
*, struct rpc_cred
*);
250 extern int nfs4_init_session(struct nfs_server
*server
);
251 extern int nfs4_proc_get_lease_time(struct nfs_client
*clp
,
252 struct nfs_fsinfo
*fsinfo
);
253 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data
*data
,
257 is_ds_only_client(struct nfs_client
*clp
)
259 return (clp
->cl_exchange_flags
& EXCHGID4_FLAG_MASK_PNFS
) ==
260 EXCHGID4_FLAG_USE_PNFS_DS
;
264 is_ds_client(struct nfs_client
*clp
)
266 return clp
->cl_exchange_flags
& EXCHGID4_FLAG_USE_PNFS_DS
;
268 #else /* CONFIG_NFS_v4_1 */
269 static inline struct nfs4_session
*nfs4_get_session(const struct nfs_server
*server
)
274 static inline int nfs4_setup_sequence(const struct nfs_server
*server
,
275 struct nfs4_sequence_args
*args
, struct nfs4_sequence_res
*res
,
276 struct rpc_task
*task
)
281 static inline int nfs4_init_session(struct nfs_server
*server
)
287 is_ds_only_client(struct nfs_client
*clp
)
293 is_ds_client(struct nfs_client
*clp
)
297 #endif /* CONFIG_NFS_V4_1 */
299 extern const struct nfs4_minor_version_ops
*nfs_v4_minor_ops
[];
301 extern const u32 nfs4_fattr_bitmap
[3];
302 extern const u32 nfs4_statfs_bitmap
[2];
303 extern const u32 nfs4_pathconf_bitmap
[2];
304 extern const u32 nfs4_fsinfo_bitmap
[3];
305 extern const u32 nfs4_fs_locations_bitmap
[2];
307 void nfs4_free_client(struct nfs_client
*);
309 struct nfs_client
*nfs4_alloc_client(const struct nfs_client_initdata
*);
312 extern void nfs4_schedule_state_renewal(struct nfs_client
*);
313 extern void nfs4_renewd_prepare_shutdown(struct nfs_server
*);
314 extern void nfs4_kill_renewd(struct nfs_client
*);
315 extern void nfs4_renew_state(struct work_struct
*);
318 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
);
319 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
);
320 #if defined(CONFIG_NFS_V4_1)
321 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
);
322 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
);
323 extern void nfs4_schedule_session_recovery(struct nfs4_session
*, int);
325 static inline void nfs4_schedule_session_recovery(struct nfs4_session
*session
, int err
)
328 #endif /* CONFIG_NFS_V4_1 */
330 extern struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*, struct rpc_cred
*, gfp_t
);
331 extern void nfs4_put_state_owner(struct nfs4_state_owner
*);
332 extern void nfs4_purge_state_owners(struct nfs_server
*);
333 extern struct nfs4_state
* nfs4_get_open_state(struct inode
*, struct nfs4_state_owner
*);
334 extern void nfs4_put_open_state(struct nfs4_state
*);
335 extern void nfs4_close_state(struct nfs4_state
*, fmode_t
);
336 extern void nfs4_close_sync(struct nfs4_state
*, fmode_t
);
337 extern void nfs4_state_set_mode_locked(struct nfs4_state
*, fmode_t
);
338 extern void nfs_inode_find_state_and_recover(struct inode
*inode
,
339 const nfs4_stateid
*stateid
);
340 extern void nfs4_schedule_lease_recovery(struct nfs_client
*);
341 extern void nfs4_schedule_state_manager(struct nfs_client
*);
342 extern void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
);
343 extern void nfs4_schedule_stateid_recovery(const struct nfs_server
*, struct nfs4_state
*);
344 extern void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
);
345 extern void nfs41_handle_recall_slot(struct nfs_client
*clp
);
346 extern void nfs41_handle_server_scope(struct nfs_client
*,
347 struct nfs41_server_scope
**);
348 extern void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
);
349 extern int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
);
350 extern void nfs4_select_rw_stateid(nfs4_stateid
*, struct nfs4_state
*,
351 fmode_t
, fl_owner_t
, pid_t
);
353 extern struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
);
354 extern int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
);
355 extern void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
);
356 extern void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
);
357 extern void nfs_release_seqid(struct nfs_seqid
*seqid
);
358 extern void nfs_free_seqid(struct nfs_seqid
*seqid
);
360 extern void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
);
362 extern const nfs4_stateid zero_stateid
;
365 struct nfs_mount_info
;
366 extern struct nfs_subversion nfs_v4
;
367 struct dentry
*nfs4_try_mount(int, const char *, struct nfs_mount_info
*, struct nfs_subversion
*);
368 extern bool nfs4_disable_idmapping
;
369 extern unsigned short max_session_slots
;
370 extern unsigned short send_implementation_id
;
374 int nfs4_register_sysctl(void);
375 void nfs4_unregister_sysctl(void);
377 static inline int nfs4_register_sysctl(void)
382 static inline void nfs4_unregister_sysctl(void)
388 extern struct rpc_procinfo nfs4_procedures
[];
390 struct nfs4_mount_data
;
393 extern struct svc_version nfs4_callback_version1
;
394 extern struct svc_version nfs4_callback_version4
;
396 static inline void nfs4_stateid_copy(nfs4_stateid
*dst
, const nfs4_stateid
*src
)
398 memcpy(dst
, src
, sizeof(*dst
));
401 static inline bool nfs4_stateid_match(const nfs4_stateid
*dst
, const nfs4_stateid
*src
)
403 return memcmp(dst
, src
, sizeof(*dst
)) == 0;
408 #define nfs4_close_state(a, b) do { } while (0)
409 #define nfs4_close_sync(a, b) do { } while (0)
411 #endif /* CONFIG_NFS_V4 */
412 #endif /* __LINUX_FS_NFS_NFS4_FS.H */