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_STATE_RECOVER = 0,
42 NFS4CLNT_LEASE_EXPIRED,
46 * The nfs4_client identifies our client state to the server.
49 struct list_head cl_servers; /* Global list of servers */
50 struct in_addr cl_addr; /* Server identifier */
51 u64 cl_clientid; /* constant */
52 nfs4_verifier cl_confirm;
53 unsigned long cl_state;
58 * The following rwsem ensures exclusive access to the server
59 * while we recover the state following a lease expiration.
61 struct rw_semaphore cl_sem;
63 struct list_head cl_delegations;
64 struct list_head cl_state_owners;
65 struct list_head cl_unused;
70 struct rpc_clnt * cl_rpcclient;
72 struct list_head cl_superblocks; /* List of nfs_server structs */
74 unsigned long cl_lease_time;
75 unsigned long cl_last_renewal;
76 struct work_struct cl_renewd;
77 struct work_struct cl_recoverd;
79 struct rpc_wait_queue cl_rpcwaitq;
81 /* used for the setclientid verifier */
82 struct timespec cl_boot_time;
85 struct idmap * cl_idmap;
87 /* Our own IP address, as a null-terminated string.
88 * This is used to generate the clientid, and the callback address.
91 unsigned char cl_id_uniquifier;
95 * struct rpc_sequence ensures that RPC calls are sent in the exact
96 * order that they appear on the list.
99 struct rpc_wait_queue wait; /* RPC call delay queue */
100 spinlock_t lock; /* Protects the list */
101 struct list_head list; /* Defines sequence of RPC calls */
104 #define NFS_SEQID_CONFIRMED 1
105 struct nfs_seqid_counter {
106 struct rpc_sequence *sequence;
112 struct nfs_seqid_counter *sequence;
113 struct list_head list;
116 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
118 if (seqid_mutating_err(-status))
119 seqid->flags |= NFS_SEQID_CONFIRMED;
123 * NFS4 state_owners and lock_owners are simply labels for ordered
124 * sequences of RPC calls. Their sole purpose is to provide once-only
125 * semantics by allowing the server to identify replayed requests.
127 struct nfs4_state_owner {
129 struct list_head so_list; /* per-clientid list of state_owners */
130 struct nfs4_client *so_client;
131 u32 so_id; /* 32-bit identifier, unique */
134 struct rpc_cred *so_cred; /* Associated cred */
135 struct list_head so_states;
136 struct list_head so_delegations;
137 struct nfs_seqid_counter so_seqid;
138 struct rpc_sequence so_sequence;
142 * struct nfs4_state maintains the client-side state for a given
143 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
146 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
147 * we need to know how many files are open for reading or writing on a
148 * given inode. This information too is stored here.
150 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
153 struct nfs4_lock_state {
154 struct list_head ls_locks; /* Other lock stateids */
155 struct nfs4_state * ls_state; /* Pointer to open state */
156 fl_owner_t ls_owner; /* POSIX lock owner */
157 #define NFS_LOCK_INITIALIZED 1
159 struct nfs_seqid_counter ls_seqid;
161 nfs4_stateid ls_stateid;
165 /* bits for nfs4_state->flags */
172 struct list_head open_states; /* List of states for the same state_owner */
173 struct list_head inode_states; /* List of states for the same inode */
174 struct list_head lock_states; /* List of subservient lock stateids */
176 struct nfs4_state_owner *owner; /* Pointer to the open owner */
177 struct inode *inode; /* Pointer to the inode */
179 unsigned long flags; /* Do we hold any locks? */
180 spinlock_t state_lock; /* Protects the lock_states list */
182 nfs4_stateid stateid;
184 unsigned int n_rdonly;
185 unsigned int n_wronly;
187 int state; /* State on the server (R,W, or RW) */
192 struct nfs4_exception {
197 struct nfs4_state_recovery_ops {
198 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
199 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
202 extern struct dentry_operations nfs4_dentry_operations;
203 extern 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_map_errors(int err);
213 extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short, struct rpc_cred *);
214 extern int nfs4_proc_setclientid_confirm(struct nfs4_client *, struct rpc_cred *);
215 extern int nfs4_proc_async_renew(struct nfs4_client *, struct rpc_cred *);
216 extern int nfs4_proc_renew(struct nfs4_client *, struct rpc_cred *);
217 extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state);
218 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
219 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
221 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
222 extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
224 extern const u32 nfs4_fattr_bitmap[2];
225 extern const u32 nfs4_statfs_bitmap[2];
226 extern const u32 nfs4_pathconf_bitmap[2];
227 extern const u32 nfs4_fsinfo_bitmap[2];
230 extern void nfs4_schedule_state_renewal(struct nfs4_client *);
231 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
232 extern void nfs4_kill_renewd(struct nfs4_client *);
233 extern void nfs4_renew_state(void *);
236 extern void init_nfsv4_state(struct nfs_server *);
237 extern void destroy_nfsv4_state(struct nfs_server *);
238 extern struct nfs4_client *nfs4_get_client(struct in_addr *);
239 extern void nfs4_put_client(struct nfs4_client *clp);
240 extern struct nfs4_client *nfs4_find_client(struct in_addr *);
241 struct rpc_cred *nfs4_get_renew_cred(struct nfs4_client *clp);
242 extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
244 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
245 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
246 extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
247 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
248 extern void nfs4_put_open_state(struct nfs4_state *);
249 extern void nfs4_close_state(struct nfs4_state *, mode_t);
250 extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
251 extern void nfs4_schedule_state_recovery(struct nfs4_client *);
252 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
253 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
254 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
256 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
257 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
258 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
259 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
260 extern void nfs_free_seqid(struct nfs_seqid *seqid);
262 extern const nfs4_stateid zero_stateid;
265 extern uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus);
266 extern struct rpc_procinfo nfs4_procedures[];
268 struct nfs4_mount_data;
271 extern struct svc_version nfs4_callback_version1;
275 #define init_nfsv4_state(server) do { } while (0)
276 #define destroy_nfsv4_state(server) do { } while (0)
277 #define nfs4_put_state_owner(inode, owner) do { } while (0)
278 #define nfs4_put_open_state(state) do { } while (0)
279 #define nfs4_close_state(a, b) do { } while (0)
281 #endif /* CONFIG_NFS_V4 */
282 #endif /* __LINUX_FS_NFS_NFS4_FS.H */