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RPC: allow call_encode() to delay transmission of an RPC call.
[linux-2.6-block.git] / fs / nfs / nfs4_fs.h
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4ce79717
TM		 1/*
2 * linux/fs/nfs/nfs4_fs.h
3 *
4 * Copyright (C) 2005 Trond Myklebust
5 *
6 * NFSv4-specific filesystem definitions and declarations
7 */
8
9#ifndef __LINUX_FS_NFS_NFS4_FS_H
10#define __LINUX_FS_NFS_NFS4_FS_H
11
12#ifdef CONFIG_NFS_V4
13
14struct idmap;
15
16/*
17 * In a seqid-mutating op, this macro controls which error return
18 * values trigger incrementation of the seqid.
19 *
20 * from rfc 3010:
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.
29 *
30 */
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))
39
40enum nfs4_client_state {
41 NFS4CLNT_OK = 0,
42};
43
44/*
45 * The nfs4_client identifies our client state to the server.
46 */
47struct nfs4_client {
48 struct list_head cl_servers; /* Global list of servers */
49 struct in_addr cl_addr; /* Server identifier */
50 u64 cl_clientid; /* constant */
51 nfs4_verifier cl_confirm;
52 unsigned long cl_state;
53
54 u32 cl_lockowner_id;
55
56 /*
57 * The following rwsem ensures exclusive access to the server
58 * while we recover the state following a lease expiration.
59 */
60 struct rw_semaphore cl_sem;
61
62 struct list_head cl_delegations;
63 struct list_head cl_state_owners;
64 struct list_head cl_unused;
65 int cl_nunused;
66 spinlock_t cl_lock;
67 atomic_t cl_count;
68
69 struct rpc_clnt * cl_rpcclient;
70 struct rpc_cred * cl_cred;
71
72 struct list_head cl_superblocks; /* List of nfs_server structs */
73
74 unsigned long cl_lease_time;
75 unsigned long cl_last_renewal;
76 struct work_struct cl_renewd;
77 struct work_struct cl_recoverd;
78
79 wait_queue_head_t cl_waitq;
80 struct rpc_wait_queue cl_rpcwaitq;
81
82 /* used for the setclientid verifier */
83 struct timespec cl_boot_time;
84
85 /* idmapper */
86 struct idmap * cl_idmap;
87
88 /* Our own IP address, as a null-terminated string.
89 * This is used to generate the clientid, and the callback address.
90 */
91 char cl_ipaddr[16];
92 unsigned char cl_id_uniquifier;
93};
94
95/*
96 * NFS4 state_owners and lock_owners are simply labels for ordered
97 * sequences of RPC calls. Their sole purpose is to provide once-only
98 * semantics by allowing the server to identify replayed requests.
99 *
100 * The ->so_sema is held during all state_owner seqid-mutating operations:
101 * OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
102 * so_seqid.
103 */
104struct nfs4_state_owner {
105 struct list_head so_list; /* per-clientid list of state_owners */
106 struct nfs4_client *so_client;
107 u32 so_id; /* 32-bit identifier, unique */
108 struct semaphore so_sema;
109 u32 so_seqid; /* protected by so_sema */
110 atomic_t so_count;
111
112 struct rpc_cred *so_cred; /* Associated cred */
113 struct list_head so_states;
114 struct list_head so_delegations;
115};
116
117/*
118 * struct nfs4_state maintains the client-side state for a given
119 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
120 *
121 * OPEN:
122 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
123 * we need to know how many files are open for reading or writing on a
124 * given inode. This information too is stored here.
125 *
126 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
127 */
128
129struct nfs4_lock_state {
130 struct list_head ls_locks; /* Other lock stateids */
8d0a8a9d 131 struct nfs4_state * ls_state; /* Pointer to open state */
4ce79717
TM		 132 fl_owner_t ls_owner; /* POSIX lock owner */
133#define NFS_LOCK_INITIALIZED 1
134 int ls_flags;
135 u32 ls_seqid;
136 u32 ls_id;
137 nfs4_stateid ls_stateid;
138 atomic_t ls_count;
139};
140
141/* bits for nfs4_state->flags */
142enum {
143 LK_STATE_IN_USE,
144 NFS_DELEGATED_STATE,
145};
146
147struct nfs4_state {
148 struct list_head open_states; /* List of states for the same state_owner */
149 struct list_head inode_states; /* List of states for the same inode */
150 struct list_head lock_states; /* List of subservient lock stateids */
151
152 struct nfs4_state_owner *owner; /* Pointer to the open owner */
153 struct inode *inode; /* Pointer to the inode */
154
155 unsigned long flags; /* Do we hold any locks? */
156 struct semaphore lock_sema; /* Serializes file locking operations */
8d0a8a9d 157 spinlock_t state_lock; /* Protects the lock_states list */
4ce79717
TM		 158
159 nfs4_stateid stateid;
160
161 unsigned int nreaders;
162 unsigned int nwriters;
163 int state; /* State on the server (R,W, or RW) */
164 atomic_t count;
165};
166
167
168struct nfs4_exception {
169 long timeout;
170 int retry;
171};
172
173struct nfs4_state_recovery_ops {
174 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
175 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
176};
177
178extern struct dentry_operations nfs4_dentry_operations;
179extern struct inode_operations nfs4_dir_inode_operations;
6b3b5496
BF		 180
181/* inode.c */
182extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
183extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
184extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
185
4ce79717
TM		 186
187/* nfs4proc.c */
188extern int nfs4_map_errors(int err);
189extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
190extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
191extern int nfs4_proc_async_renew(struct nfs4_client *);
192extern int nfs4_proc_renew(struct nfs4_client *);
193extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode);
194extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
195extern int nfs4_open_revalidate(struct inode *, struct dentry *, int);
196
197extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
198extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
199
200extern const u32 nfs4_fattr_bitmap[2];
201extern const u32 nfs4_statfs_bitmap[2];
202extern const u32 nfs4_pathconf_bitmap[2];
203extern const u32 nfs4_fsinfo_bitmap[2];
204
205/* nfs4renewd.c */
206extern void nfs4_schedule_state_renewal(struct nfs4_client *);
207extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
208extern void nfs4_kill_renewd(struct nfs4_client *);
209extern void nfs4_renew_state(void *);
210
211/* nfs4state.c */
212extern void init_nfsv4_state(struct nfs_server *);
213extern void destroy_nfsv4_state(struct nfs_server *);
214extern struct nfs4_client *nfs4_get_client(struct in_addr *);
215extern void nfs4_put_client(struct nfs4_client *clp);
216extern int nfs4_init_client(struct nfs4_client *clp);
217extern struct nfs4_client *nfs4_find_client(struct in_addr *);
218extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
219
220extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
221extern void nfs4_put_state_owner(struct nfs4_state_owner *);
222extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
223extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
224extern void nfs4_put_open_state(struct nfs4_state *);
225extern void nfs4_close_state(struct nfs4_state *, mode_t);
226extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode);
227extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp);
228extern void nfs4_schedule_state_recovery(struct nfs4_client *);
8d0a8a9d 229extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
4ce79717 230extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls);
4ce79717
TM		 231extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
232
233extern const nfs4_stateid zero_stateid;
234
235/* nfs4xdr.c */
236extern uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus);
237extern struct rpc_procinfo nfs4_procedures[];
238
239struct nfs4_mount_data;
240
241/* callback_xdr.c */
242extern struct svc_version nfs4_callback_version1;
243
244#else
245
246#define init_nfsv4_state(server) do { } while (0)
247#define destroy_nfsv4_state(server) do { } while (0)
248#define nfs4_put_state_owner(inode, owner) do { } while (0)
249#define nfs4_put_open_state(state) do { } while (0)
250#define nfs4_close_state(a, b) do { } while (0)
251
252#endif /* CONFIG_NFS_V4 */
253#endif /* __LINUX_FS_NFS_NFS4_FS.H */
Linux 6.x block layer and io_uring tree(s)