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,
43 NFS4CLNT_LEASE_EXPIRED,
44 NFS4CLNT_RECLAIM_REBOOT,
45 NFS4CLNT_RECLAIM_NOGRACE,
46 NFS4CLNT_CB_PATH_DOWN,
50 * struct rpc_sequence ensures that RPC calls are sent in the exact
51 * order that they appear on the list.
54 struct rpc_wait_queue wait; /* RPC call delay queue */
55 spinlock_t lock; /* Protects the list */
56 struct list_head list; /* Defines sequence of RPC calls */
59 #define NFS_SEQID_CONFIRMED 1
60 struct nfs_seqid_counter {
61 struct rpc_sequence *sequence;
67 struct nfs_seqid_counter *sequence;
68 struct list_head list;
71 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
73 if (seqid_mutating_err(-status))
74 seqid->flags |= NFS_SEQID_CONFIRMED;
77 struct nfs_unique_id {
78 struct rb_node rb_node;
83 * NFS4 state_owners and lock_owners are simply labels for ordered
84 * sequences of RPC calls. Their sole purpose is to provide once-only
85 * semantics by allowing the server to identify replayed requests.
87 struct nfs4_state_owner {
88 struct nfs_unique_id so_owner_id;
89 struct nfs_client *so_client;
90 struct nfs_server *so_server;
91 struct rb_node so_client_node;
93 struct rpc_cred *so_cred; /* Associated cred */
97 struct list_head so_states;
98 struct list_head so_delegations;
99 struct nfs_seqid_counter so_seqid;
100 struct rpc_sequence so_sequence;
104 * struct nfs4_state maintains the client-side state for a given
105 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
108 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
109 * we need to know how many files are open for reading or writing on a
110 * given inode. This information too is stored here.
112 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
115 struct nfs4_lock_state {
116 struct list_head ls_locks; /* Other lock stateids */
117 struct nfs4_state * ls_state; /* Pointer to open state */
118 fl_owner_t ls_owner; /* POSIX lock owner */
119 #define NFS_LOCK_INITIALIZED 1
121 struct nfs_seqid_counter ls_seqid;
122 struct rpc_sequence ls_sequence;
123 struct nfs_unique_id ls_id;
124 nfs4_stateid ls_stateid;
128 /* bits for nfs4_state->flags */
131 NFS_DELEGATED_STATE, /* Current stateid is delegation */
132 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
133 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
134 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
135 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
136 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
140 struct list_head open_states; /* List of states for the same state_owner */
141 struct list_head inode_states; /* List of states for the same inode */
142 struct list_head lock_states; /* List of subservient lock stateids */
144 struct nfs4_state_owner *owner; /* Pointer to the open owner */
145 struct inode *inode; /* Pointer to the inode */
147 unsigned long flags; /* Do we hold any locks? */
148 spinlock_t state_lock; /* Protects the lock_states list */
150 seqlock_t seqlock; /* Protects the stateid/open_stateid */
151 nfs4_stateid stateid; /* Current stateid: may be delegation */
152 nfs4_stateid open_stateid; /* OPEN stateid */
154 /* The following 3 fields are protected by owner->so_lock */
155 unsigned int n_rdonly; /* Number of read-only references */
156 unsigned int n_wronly; /* Number of write-only references */
157 unsigned int n_rdwr; /* Number of read/write references */
158 int state; /* State on the server (R,W, or RW) */
163 struct nfs4_exception {
168 struct nfs4_state_recovery_ops {
170 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
171 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
174 extern struct dentry_operations nfs4_dentry_operations;
175 extern const struct inode_operations nfs4_dir_inode_operations;
178 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
179 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
180 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
184 extern int nfs4_map_errors(int err);
185 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *);
186 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
187 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
188 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
189 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait);
190 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
191 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
192 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
193 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
194 struct nfs4_fs_locations *fs_locations, struct page *page);
196 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
197 extern struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops;
199 extern const u32 nfs4_fattr_bitmap[2];
200 extern const u32 nfs4_statfs_bitmap[2];
201 extern const u32 nfs4_pathconf_bitmap[2];
202 extern const u32 nfs4_fsinfo_bitmap[2];
203 extern const u32 nfs4_fs_locations_bitmap[2];
206 extern void nfs4_schedule_state_renewal(struct nfs_client *);
207 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
208 extern void nfs4_kill_renewd(struct nfs_client *);
209 extern void nfs4_renew_state(struct work_struct *);
212 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
214 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
215 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
216 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
217 extern void nfs4_put_open_state(struct nfs4_state *);
218 extern void nfs4_close_state(struct path *, struct nfs4_state *, mode_t);
219 extern void nfs4_close_sync(struct path *, struct nfs4_state *, mode_t);
220 extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
221 extern void nfs4_schedule_state_recovery(struct nfs_client *);
222 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
223 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
224 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
226 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
227 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
228 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
229 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
230 extern void nfs_free_seqid(struct nfs_seqid *seqid);
232 extern const nfs4_stateid zero_stateid;
235 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
236 extern struct rpc_procinfo nfs4_procedures[];
238 struct nfs4_mount_data;
241 extern struct svc_version nfs4_callback_version1;
245 #define nfs4_close_state(a, b, c) do { } while (0)
246 #define nfs4_close_sync(a, b, c) do { } while (0)
248 #endif /* CONFIG_NFS_V4 */
249 #endif /* __LINUX_FS_NFS_NFS4_FS.H */