rcu: remove all rcu head initializations, except on_stack initializations
[linux-2.6.git] / include / linux / nfs_fs_sb.h
1 #ifndef _NFS_FS_SB
2 #define _NFS_FS_SB
3
4 #include <linux/list.h>
5 #include <linux/backing-dev.h>
6 #include <linux/wait.h>
7 #include <linux/nfs_xdr.h>
8 #include <linux/sunrpc/xprt.h>
9
10 #include <asm/atomic.h>
11
12 struct nfs4_session;
13 struct nfs_iostats;
14 struct nlm_host;
15 struct nfs4_sequence_args;
16 struct nfs4_sequence_res;
17 struct nfs_server;
18
19 /*
20  * The nfs_client identifies our client state to the server.
21  */
22 struct nfs_client {
23         atomic_t                cl_count;
24         int                     cl_cons_state;  /* current construction state (-ve: init error) */
25 #define NFS_CS_READY            0               /* ready to be used */
26 #define NFS_CS_INITING          1               /* busy initialising */
27 #define NFS_CS_SESSION_INITING  2               /* busy initialising  session */
28         unsigned long           cl_res_state;   /* NFS resources state */
29 #define NFS_CS_CALLBACK         1               /* - callback started */
30 #define NFS_CS_IDMAP            2               /* - idmap started */
31 #define NFS_CS_RENEWD           3               /* - renewd started */
32         struct sockaddr_storage cl_addr;        /* server identifier */
33         size_t                  cl_addrlen;
34         char *                  cl_hostname;    /* hostname of server */
35         struct list_head        cl_share_link;  /* link in global client list */
36         struct list_head        cl_superblocks; /* List of nfs_server structs */
37
38         struct rpc_clnt *       cl_rpcclient;
39         const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
40         int                     cl_proto;       /* Network transport protocol */
41
42         u32                     cl_minorversion;/* NFSv4 minorversion */
43         struct rpc_cred         *cl_machine_cred;
44
45 #ifdef CONFIG_NFS_V4
46         u64                     cl_clientid;    /* constant */
47         nfs4_verifier           cl_confirm;
48         unsigned long           cl_state;
49
50         struct rb_root          cl_openowner_id;
51         struct rb_root          cl_lockowner_id;
52
53         struct list_head        cl_delegations;
54         struct rb_root          cl_state_owners;
55         spinlock_t              cl_lock;
56
57         unsigned long           cl_lease_time;
58         unsigned long           cl_last_renewal;
59         struct delayed_work     cl_renewd;
60
61         struct rpc_wait_queue   cl_rpcwaitq;
62
63         /* used for the setclientid verifier */
64         struct timespec         cl_boot_time;
65
66         /* idmapper */
67         struct idmap *          cl_idmap;
68
69         /* Our own IP address, as a null-terminated string.
70          * This is used to generate the clientid, and the callback address.
71          */
72         char                    cl_ipaddr[48];
73         unsigned char           cl_id_uniquifier;
74         int                  (* cl_call_sync)(struct nfs_server *server,
75                                               struct rpc_message *msg,
76                                               struct nfs4_sequence_args *args,
77                                               struct nfs4_sequence_res *res,
78                                               int cache_reply);
79 #endif /* CONFIG_NFS_V4 */
80
81 #ifdef CONFIG_NFS_V4_1
82         /* clientid returned from EXCHANGE_ID, used by session operations */
83         u64                     cl_ex_clid;
84         /* The sequence id to use for the next CREATE_SESSION */
85         u32                     cl_seqid;
86         /* The flags used for obtaining the clientid during EXCHANGE_ID */
87         u32                     cl_exchange_flags;
88         struct nfs4_session     *cl_session;    /* sharred session */
89 #endif /* CONFIG_NFS_V4_1 */
90
91 #ifdef CONFIG_NFS_FSCACHE
92         struct fscache_cookie   *fscache;       /* client index cache cookie */
93 #endif
94 };
95
96 /*
97  * NFS client parameters stored in the superblock.
98  */
99 struct nfs_server {
100         struct nfs_client *     nfs_client;     /* shared client and NFS4 state */
101         struct list_head        client_link;    /* List of other nfs_server structs
102                                                  * that share the same client
103                                                  */
104         struct list_head        master_link;    /* link in master servers list */
105         struct rpc_clnt *       client;         /* RPC client handle */
106         struct rpc_clnt *       client_acl;     /* ACL RPC client handle */
107         struct nlm_host         *nlm_host;      /* NLM client handle */
108         struct nfs_iostats __percpu *io_stats;  /* I/O statistics */
109         struct backing_dev_info backing_dev_info;
110         atomic_long_t           writeback;      /* number of writeback pages */
111         int                     flags;          /* various flags */
112         unsigned int            caps;           /* server capabilities */
113         unsigned int            rsize;          /* read size */
114         unsigned int            rpages;         /* read size (in pages) */
115         unsigned int            wsize;          /* write size */
116         unsigned int            wpages;         /* write size (in pages) */
117         unsigned int            wtmult;         /* server disk block size */
118         unsigned int            dtsize;         /* readdir size */
119         unsigned short          port;           /* "port=" setting */
120         unsigned int            bsize;          /* server block size */
121         unsigned int            acregmin;       /* attr cache timeouts */
122         unsigned int            acregmax;
123         unsigned int            acdirmin;
124         unsigned int            acdirmax;
125         unsigned int            namelen;
126         unsigned int            options;        /* extra options enabled by mount */
127 #define NFS_OPTION_FSCACHE      0x00000001      /* - local caching enabled */
128
129         struct nfs_fsid         fsid;
130         __u64                   maxfilesize;    /* maximum file size */
131         unsigned long           mount_time;     /* when this fs was mounted */
132         dev_t                   s_dev;          /* superblock dev numbers */
133
134 #ifdef CONFIG_NFS_FSCACHE
135         struct nfs_fscache_key  *fscache_key;   /* unique key for superblock */
136         struct fscache_cookie   *fscache;       /* superblock cookie */
137 #endif
138
139 #ifdef CONFIG_NFS_V4
140         u32                     attr_bitmask[2];/* V4 bitmask representing the set
141                                                    of attributes supported on this
142                                                    filesystem */
143         u32                     cache_consistency_bitmask[2];
144                                                 /* V4 bitmask representing the subset
145                                                    of change attribute, size, ctime
146                                                    and mtime attributes supported by
147                                                    the server */
148         u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
149                                                    that are supported on this
150                                                    filesystem */
151 #endif
152         void (*destroy)(struct nfs_server *);
153
154         atomic_t active; /* Keep trace of any activity to this server */
155
156         /* mountd-related mount options */
157         struct sockaddr_storage mountd_address;
158         size_t                  mountd_addrlen;
159         u32                     mountd_version;
160         unsigned short          mountd_port;
161         unsigned short          mountd_protocol;
162 };
163
164 /* Server capabilities */
165 #define NFS_CAP_READDIRPLUS     (1U << 0)
166 #define NFS_CAP_HARDLINKS       (1U << 1)
167 #define NFS_CAP_SYMLINKS        (1U << 2)
168 #define NFS_CAP_ACLS            (1U << 3)
169 #define NFS_CAP_ATOMIC_OPEN     (1U << 4)
170 #define NFS_CAP_CHANGE_ATTR     (1U << 5)
171 #define NFS_CAP_FILEID          (1U << 6)
172 #define NFS_CAP_MODE            (1U << 7)
173 #define NFS_CAP_NLINK           (1U << 8)
174 #define NFS_CAP_OWNER           (1U << 9)
175 #define NFS_CAP_OWNER_GROUP     (1U << 10)
176 #define NFS_CAP_ATIME           (1U << 11)
177 #define NFS_CAP_CTIME           (1U << 12)
178 #define NFS_CAP_MTIME           (1U << 13)
179 #define NFS_CAP_POSIX_LOCK      (1U << 14)
180
181
182 /* maximum number of slots to use */
183 #define NFS4_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE
184
185 #if defined(CONFIG_NFS_V4_1)
186
187 /* Sessions */
188 #define SLOT_TABLE_SZ (NFS4_MAX_SLOT_TABLE/(8*sizeof(long)))
189 struct nfs4_slot_table {
190         struct nfs4_slot *slots;                /* seqid per slot */
191         unsigned long   used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
192         spinlock_t      slot_tbl_lock;
193         struct rpc_wait_queue   slot_tbl_waitq; /* allocators may wait here */
194         int             max_slots;              /* # slots in table */
195         int             highest_used_slotid;    /* sent to server on each SEQ.
196                                                  * op for dynamic resizing */
197         int             target_max_slots;       /* Set by CB_RECALL_SLOT as
198                                                  * the new max_slots */
199 };
200
201 static inline int slot_idx(struct nfs4_slot_table *tbl, struct nfs4_slot *sp)
202 {
203         return sp - tbl->slots;
204 }
205
206 /*
207  * Session related parameters
208  */
209 struct nfs4_session {
210         struct nfs4_sessionid           sess_id;
211         u32                             flags;
212         unsigned long                   session_state;
213         u32                             hash_alg;
214         u32                             ssv_len;
215         struct completion               complete;
216
217         /* The fore and back channel */
218         struct nfs4_channel_attrs       fc_attrs;
219         struct nfs4_slot_table          fc_slot_table;
220         struct nfs4_channel_attrs       bc_attrs;
221         struct nfs4_slot_table          bc_slot_table;
222         struct nfs_client               *clp;
223 };
224
225 #endif /* CONFIG_NFS_V4_1 */
226 #endif