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 int (*free_lock_state
)(struct nfs_server
*,
51 struct nfs4_lock_state
*);
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
;
98 seqcount_t so_reclaim_seqcount
;
99 struct mutex so_delegreturn_mutex
;
103 NFS_OWNER_RECLAIM_REBOOT
,
104 NFS_OWNER_RECLAIM_NOGRACE
107 #define NFS_LOCK_NEW 0
108 #define NFS_LOCK_RECLAIM 1
109 #define NFS_LOCK_EXPIRED 2
112 * struct nfs4_state maintains the client-side state for a given
113 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
116 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
117 * we need to know how many files are open for reading or writing on a
118 * given inode. This information too is stored here.
120 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
123 struct nfs4_lock_owner
{
124 unsigned int lo_type
;
125 #define NFS4_ANY_LOCK_TYPE (0U)
126 #define NFS4_FLOCK_LOCK_TYPE (1U << 0)
127 #define NFS4_POSIX_LOCK_TYPE (1U << 1)
129 fl_owner_t posix_owner
;
134 struct nfs4_lock_state
{
135 struct list_head ls_locks
; /* Other lock stateids */
136 struct nfs4_state
* ls_state
; /* Pointer to open state */
137 #define NFS_LOCK_INITIALIZED 0
138 unsigned long ls_flags
;
139 struct nfs_seqid_counter ls_seqid
;
140 nfs4_stateid ls_stateid
;
142 struct nfs4_lock_owner ls_owner
;
145 /* bits for nfs4_state->flags */
148 NFS_DELEGATED_STATE
, /* Current stateid is delegation */
149 NFS_OPEN_STATE
, /* OPEN stateid is set */
150 NFS_O_RDONLY_STATE
, /* OPEN stateid has read-only state */
151 NFS_O_WRONLY_STATE
, /* OPEN stateid has write-only state */
152 NFS_O_RDWR_STATE
, /* OPEN stateid has read/write state */
153 NFS_STATE_RECLAIM_REBOOT
, /* OPEN stateid server rebooted */
154 NFS_STATE_RECLAIM_NOGRACE
, /* OPEN stateid needs to recover state */
155 NFS_STATE_POSIX_LOCKS
, /* Posix locks are supported */
156 NFS_STATE_RECOVERY_FAILED
, /* OPEN stateid state recovery failed */
160 struct list_head open_states
; /* List of states for the same state_owner */
161 struct list_head inode_states
; /* List of states for the same inode */
162 struct list_head lock_states
; /* List of subservient lock stateids */
164 struct nfs4_state_owner
*owner
; /* Pointer to the open owner */
165 struct inode
*inode
; /* Pointer to the inode */
167 unsigned long flags
; /* Do we hold any locks? */
168 spinlock_t state_lock
; /* Protects the lock_states list */
170 seqlock_t seqlock
; /* Protects the stateid/open_stateid */
171 nfs4_stateid stateid
; /* Current stateid: may be delegation */
172 nfs4_stateid open_stateid
; /* OPEN stateid */
174 /* The following 3 fields are protected by owner->so_lock */
175 unsigned int n_rdonly
; /* Number of read-only references */
176 unsigned int n_wronly
; /* Number of write-only references */
177 unsigned int n_rdwr
; /* Number of read/write references */
178 fmode_t state
; /* State on the server (R,W, or RW) */
183 struct nfs4_exception
{
186 struct nfs4_state
*state
;
190 struct nfs4_state_recovery_ops
{
193 int (*recover_open
)(struct nfs4_state_owner
*, struct nfs4_state
*);
194 int (*recover_lock
)(struct nfs4_state
*, struct file_lock
*);
195 int (*establish_clid
)(struct nfs_client
*, struct rpc_cred
*);
196 int (*reclaim_complete
)(struct nfs_client
*, struct rpc_cred
*);
197 int (*detect_trunking
)(struct nfs_client
*, struct nfs_client
**,
201 struct nfs4_state_maintenance_ops
{
202 int (*sched_state_renewal
)(struct nfs_client
*, struct rpc_cred
*, unsigned);
203 struct rpc_cred
* (*get_state_renewal_cred_locked
)(struct nfs_client
*);
204 int (*renew_lease
)(struct nfs_client
*, struct rpc_cred
*);
207 extern const struct dentry_operations nfs4_dentry_operations
;
210 int nfs_atomic_open(struct inode
*, struct dentry
*, struct file
*,
211 unsigned, umode_t
, int *);
214 extern struct file_system_type nfs4_fs_type
;
216 /* nfs4namespace.c */
217 rpc_authflavor_t
nfs_find_best_sec(struct nfs4_secinfo_flavors
*);
218 struct rpc_clnt
*nfs4_create_sec_client(struct rpc_clnt
*, struct inode
*, struct qstr
*);
219 struct vfsmount
*nfs4_submount(struct nfs_server
*, struct dentry
*,
220 struct nfs_fh
*, struct nfs_fattr
*);
223 extern int nfs4_proc_setclientid(struct nfs_client
*, u32
, unsigned short, struct rpc_cred
*, struct nfs4_setclientid_res
*);
224 extern int nfs4_proc_setclientid_confirm(struct nfs_client
*, struct nfs4_setclientid_res
*arg
, struct rpc_cred
*);
225 extern int nfs4_proc_get_rootfh(struct nfs_server
*, struct nfs_fh
*, struct nfs_fsinfo
*);
226 extern int nfs4_proc_bind_conn_to_session(struct nfs_client
*, struct rpc_cred
*cred
);
227 extern int nfs4_proc_exchange_id(struct nfs_client
*clp
, struct rpc_cred
*cred
);
228 extern int nfs4_destroy_clientid(struct nfs_client
*clp
);
229 extern int nfs4_init_clientid(struct nfs_client
*, struct rpc_cred
*);
230 extern int nfs41_init_clientid(struct nfs_client
*, struct rpc_cred
*);
231 extern int nfs4_do_close(struct nfs4_state
*state
, gfp_t gfp_mask
, int wait
);
232 extern int nfs4_server_capabilities(struct nfs_server
*server
, struct nfs_fh
*fhandle
);
233 extern int nfs4_proc_fs_locations(struct rpc_clnt
*, struct inode
*, const struct qstr
*,
234 struct nfs4_fs_locations
*, struct page
*);
235 extern struct rpc_clnt
*nfs4_proc_lookup_mountpoint(struct inode
*, struct qstr
*,
236 struct nfs_fh
*, struct nfs_fattr
*);
237 extern int nfs4_proc_secinfo(struct inode
*, const struct qstr
*, struct nfs4_secinfo_flavors
*);
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 nfs41_setup_sequence(struct nfs4_session
*session
,
251 struct nfs4_sequence_args
*args
, struct nfs4_sequence_res
*res
,
252 struct rpc_task
*task
);
253 extern int nfs4_proc_create_session(struct nfs_client
*, struct rpc_cred
*);
254 extern int nfs4_proc_destroy_session(struct nfs4_session
*, struct rpc_cred
*);
255 extern int nfs4_proc_get_lease_time(struct nfs_client
*clp
,
256 struct nfs_fsinfo
*fsinfo
);
257 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data
*data
,
261 is_ds_only_client(struct nfs_client
*clp
)
263 return (clp
->cl_exchange_flags
& EXCHGID4_FLAG_MASK_PNFS
) ==
264 EXCHGID4_FLAG_USE_PNFS_DS
;
268 is_ds_client(struct nfs_client
*clp
)
270 return clp
->cl_exchange_flags
& EXCHGID4_FLAG_USE_PNFS_DS
;
272 #else /* CONFIG_NFS_v4_1 */
273 static inline struct nfs4_session
*nfs4_get_session(const struct nfs_server
*server
)
279 is_ds_only_client(struct nfs_client
*clp
)
285 is_ds_client(struct nfs_client
*clp
)
289 #endif /* CONFIG_NFS_V4_1 */
291 extern const struct nfs4_minor_version_ops
*nfs_v4_minor_ops
[];
293 extern const u32 nfs4_fattr_bitmap
[3];
294 extern const u32 nfs4_statfs_bitmap
[3];
295 extern const u32 nfs4_pathconf_bitmap
[3];
296 extern const u32 nfs4_fsinfo_bitmap
[3];
297 extern const u32 nfs4_fs_locations_bitmap
[3];
299 void nfs4_free_client(struct nfs_client
*);
301 struct nfs_client
*nfs4_alloc_client(const struct nfs_client_initdata
*);
304 extern void nfs4_schedule_state_renewal(struct nfs_client
*);
305 extern void nfs4_renewd_prepare_shutdown(struct nfs_server
*);
306 extern void nfs4_kill_renewd(struct nfs_client
*);
307 extern void nfs4_renew_state(struct work_struct
*);
310 struct rpc_cred
*nfs4_get_clid_cred(struct nfs_client
*clp
);
311 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
);
312 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
);
313 int nfs4_discover_server_trunking(struct nfs_client
*clp
,
314 struct nfs_client
**);
315 int nfs40_discover_server_trunking(struct nfs_client
*clp
,
316 struct nfs_client
**, struct rpc_cred
*);
317 #if defined(CONFIG_NFS_V4_1)
318 int nfs41_discover_server_trunking(struct nfs_client
*clp
,
319 struct nfs_client
**, struct rpc_cred
*);
320 extern void nfs4_schedule_session_recovery(struct nfs4_session
*, int);
321 extern void nfs41_server_notify_target_slotid_update(struct nfs_client
*clp
);
322 extern void nfs41_server_notify_highest_slotid_update(struct nfs_client
*clp
);
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 int nfs4_wait_clnt_recover(struct nfs_client
*clp
);
342 extern int nfs4_client_recover_expired_lease(struct nfs_client
*clp
);
343 extern void nfs4_schedule_state_manager(struct nfs_client
*);
344 extern void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
);
345 extern int nfs4_schedule_stateid_recovery(const struct nfs_server
*, struct nfs4_state
*);
346 extern void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
);
347 extern void nfs41_handle_server_scope(struct nfs_client
*,
348 struct nfs41_server_scope
**);
349 extern void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
);
350 extern int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
);
351 extern int nfs4_select_rw_stateid(nfs4_stateid
*, struct nfs4_state
*,
352 fmode_t
, const struct nfs_lockowner
*);
354 extern struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
);
355 extern int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
);
356 extern void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
);
357 extern void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
);
358 extern void nfs_release_seqid(struct nfs_seqid
*seqid
);
359 extern void nfs_free_seqid(struct nfs_seqid
*seqid
);
361 extern void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
);
363 extern const nfs4_stateid zero_stateid
;
366 struct nfs_mount_info
;
367 extern struct nfs_subversion nfs_v4
;
368 struct dentry
*nfs4_try_mount(int, const char *, struct nfs_mount_info
*, struct nfs_subversion
*);
369 extern bool nfs4_disable_idmapping
;
370 extern unsigned short max_session_slots
;
371 extern unsigned short send_implementation_id
;
373 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
374 extern char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
];
378 int nfs4_register_sysctl(void);
379 void nfs4_unregister_sysctl(void);
381 static inline int nfs4_register_sysctl(void)
386 static inline void nfs4_unregister_sysctl(void)
392 extern struct rpc_procinfo nfs4_procedures
[];
394 struct nfs4_mount_data
;
397 extern struct svc_version nfs4_callback_version1
;
398 extern struct svc_version nfs4_callback_version4
;
400 static inline void nfs4_stateid_copy(nfs4_stateid
*dst
, const nfs4_stateid
*src
)
402 memcpy(dst
, src
, sizeof(*dst
));
405 static inline bool nfs4_stateid_match(const nfs4_stateid
*dst
, const nfs4_stateid
*src
)
407 return memcmp(dst
, src
, sizeof(*dst
)) == 0;
410 static inline bool nfs4_valid_open_stateid(const struct nfs4_state
*state
)
412 return test_bit(NFS_STATE_RECOVERY_FAILED
, &state
->flags
) == 0;
417 #define nfs4_close_state(a, b) do { } while (0)
418 #define nfs4_close_sync(a, b) do { } while (0)
420 #endif /* CONFIG_NFS_V4 */
421 #endif /* __LINUX_FS_NFS_NFS4_FS.H */