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 * struct rpc_sequence ensures that RPC calls are sent in the exact
47 * order that they appear on the list.
50 struct rpc_wait_queue wait; /* RPC call delay queue */
51 spinlock_t lock; /* Protects the list */
52 struct list_head list; /* Defines sequence of RPC calls */
55 #define NFS_SEQID_CONFIRMED 1
56 struct nfs_seqid_counter {
57 struct rpc_sequence *sequence;
63 struct nfs_seqid_counter *sequence;
64 struct list_head list;
67 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
69 if (seqid_mutating_err(-status))
70 seqid->flags |= NFS_SEQID_CONFIRMED;
74 * NFS4 state_owners and lock_owners are simply labels for ordered
75 * sequences of RPC calls. Their sole purpose is to provide once-only
76 * semantics by allowing the server to identify replayed requests.
78 struct nfs4_state_owner {
80 struct list_head so_list; /* per-clientid list of state_owners */
81 struct nfs_client *so_client;
82 u32 so_id; /* 32-bit identifier, unique */
85 struct rpc_cred *so_cred; /* Associated cred */
86 struct list_head so_states;
87 struct list_head so_delegations;
88 struct nfs_seqid_counter so_seqid;
89 struct rpc_sequence so_sequence;
93 * struct nfs4_state maintains the client-side state for a given
94 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
97 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
98 * we need to know how many files are open for reading or writing on a
99 * given inode. This information too is stored here.
101 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
104 struct nfs4_lock_state {
105 struct list_head ls_locks; /* Other lock stateids */
106 struct nfs4_state * ls_state; /* Pointer to open state */
107 fl_owner_t ls_owner; /* POSIX lock owner */
108 #define NFS_LOCK_INITIALIZED 1
110 struct nfs_seqid_counter ls_seqid;
112 nfs4_stateid ls_stateid;
116 /* bits for nfs4_state->flags */
123 struct list_head open_states; /* List of states for the same state_owner */
124 struct list_head inode_states; /* List of states for the same inode */
125 struct list_head lock_states; /* List of subservient lock stateids */
127 struct nfs4_state_owner *owner; /* Pointer to the open owner */
128 struct inode *inode; /* Pointer to the inode */
130 unsigned long flags; /* Do we hold any locks? */
131 spinlock_t state_lock; /* Protects the lock_states list */
133 nfs4_stateid stateid;
135 unsigned int n_rdonly;
136 unsigned int n_wronly;
138 int state; /* State on the server (R,W, or RW) */
143 struct nfs4_exception {
148 struct nfs4_state_recovery_ops {
149 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
150 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
153 extern struct dentry_operations nfs4_dentry_operations;
154 extern const struct inode_operations nfs4_dir_inode_operations;
157 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
158 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
159 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
163 extern int nfs4_map_errors(int err);
164 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *);
165 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
166 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
167 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
168 extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state);
169 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
170 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
171 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
172 extern int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
173 struct nfs4_fs_locations *fs_locations, struct page *page);
175 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
176 extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
178 extern const u32 nfs4_fattr_bitmap[2];
179 extern const u32 nfs4_statfs_bitmap[2];
180 extern const u32 nfs4_pathconf_bitmap[2];
181 extern const u32 nfs4_fsinfo_bitmap[2];
182 extern const u32 nfs4_fs_locations_bitmap[2];
185 extern void nfs4_schedule_state_renewal(struct nfs_client *);
186 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
187 extern void nfs4_kill_renewd(struct nfs_client *);
188 extern void nfs4_renew_state(struct work_struct *);
191 struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
192 extern u32 nfs4_alloc_lockowner_id(struct nfs_client *);
194 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
195 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
196 extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
197 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
198 extern void nfs4_put_open_state(struct nfs4_state *);
199 extern void nfs4_close_state(struct nfs4_state *, mode_t);
200 extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
201 extern void nfs4_schedule_state_recovery(struct nfs_client *);
202 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
203 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
204 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
206 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
207 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
208 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
209 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
210 extern void nfs_free_seqid(struct nfs_seqid *seqid);
212 extern const nfs4_stateid zero_stateid;
215 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
216 extern struct rpc_procinfo nfs4_procedures[];
218 struct nfs4_mount_data;
221 extern struct svc_version nfs4_callback_version1;
225 #define nfs4_close_state(a, b) do { } while (0)
227 #endif /* CONFIG_NFS_V4 */
228 #endif /* __LINUX_FS_NFS_NFS4_FS.H */