fs/nfs/nfs4_fs.h

   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
  14 struct 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
  40 enum nfs4_client_state {
  41         NFS4CLNT_OK  = 0,
  42 };
  43
  44 /*
  45  * The nfs4_client identifies our client state to the server.
  46  */
  47 struct 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  * struct rpc_sequence ensures that RPC calls are sent in the exact
  97  * order that they appear on the list.
  98  */
  99 struct rpc_sequence {
 100         struct rpc_wait_queue   wait;   /* RPC call delay queue */
 101         spinlock_t lock;                /* Protects the list */
 102         struct list_head list;          /* Defines sequence of RPC calls */
 103 };
 104
 105 #define NFS_SEQID_CONFIRMED 1
 106 struct nfs_seqid_counter {
 107         struct rpc_sequence *sequence;
 108         int flags;
 109         u32 counter;
 110 };
 111
 112 struct nfs_seqid {
 113         struct nfs_seqid_counter *sequence;
 114         struct list_head list;
 115 };
 116
 117 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
 118 {
 119         if (seqid_mutating_err(-status))
 120                 seqid->flags |= NFS_SEQID_CONFIRMED;
 121 }
 122
 123 /*
 124  * NFS4 state_owners and lock_owners are simply labels for ordered
 125  * sequences of RPC calls. Their sole purpose is to provide once-only
 126  * semantics by allowing the server to identify replayed requests.
 127  */
 128 struct nfs4_state_owner {
 129         spinlock_t           so_lock;
 130         struct list_head     so_list;    /* per-clientid list of state_owners */
 131         struct nfs4_client   *so_client;
 132         u32                  so_id;      /* 32-bit identifier, unique */
 133         atomic_t             so_count;
 134
 135         struct rpc_cred      *so_cred;   /* Associated cred */
 136         struct list_head     so_states;
 137         struct list_head     so_delegations;
 138         struct nfs_seqid_counter so_seqid;
 139         struct rpc_sequence  so_sequence;
 140 };
 141
 142 /*
 143  * struct nfs4_state maintains the client-side state for a given
 144  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 145  *
 146  * OPEN:
 147  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 148  * we need to know how many files are open for reading or writing on a
 149  * given inode. This information too is stored here.
 150  *
 151  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 152  */
 153
 154 struct nfs4_lock_state {
 155         struct list_head        ls_locks;       /* Other lock stateids */
 156         struct nfs4_state *     ls_state;       /* Pointer to open state */
 157         fl_owner_t              ls_owner;       /* POSIX lock owner */
 158 #define NFS_LOCK_INITIALIZED 1
 159         int                     ls_flags;
 160         struct nfs_seqid_counter        ls_seqid;
 161         u32                     ls_id;
 162         nfs4_stateid            ls_stateid;
 163         atomic_t                ls_count;
 164 };
 165
 166 /* bits for nfs4_state->flags */
 167 enum {
 168         LK_STATE_IN_USE,
 169         NFS_DELEGATED_STATE,
 170 };
 171
 172 struct nfs4_state {
 173         struct list_head open_states;   /* List of states for the same state_owner */
 174         struct list_head inode_states;  /* List of states for the same inode */
 175         struct list_head lock_states;   /* List of subservient lock stateids */
 176
 177         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 178         struct inode *inode;            /* Pointer to the inode */
 179
 180         unsigned long flags;            /* Do we hold any locks? */
 181         spinlock_t state_lock;          /* Protects the lock_states list */
 182
 183         nfs4_stateid stateid;
 184
 185         unsigned int nreaders;
 186         unsigned int nwriters;
 187         int state;                      /* State on the server (R,W, or RW) */
 188         atomic_t count;
 189 };
 190
 191
 192 struct nfs4_exception {
 193         long timeout;
 194         int retry;
 195 };
 196
 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 *);
 200 };
 201
 202 extern struct dentry_operations nfs4_dentry_operations;
 203 extern struct inode_operations nfs4_dir_inode_operations;
 204
 205 /* inode.c */
 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);
 209
 210
 211 /* nfs4proc.c */
 212 extern int nfs4_map_errors(int err);
 213 extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
 214 extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
 215 extern int nfs4_proc_async_renew(struct nfs4_client *);
 216 extern int nfs4_proc_renew(struct nfs4_client *);
 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 *);
 220
 221 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
 222 extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
 223
 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];
 228
 229 /* nfs4renewd.c */
 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 *);
 234
 235 /* nfs4state.c */
 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 int nfs4_init_client(struct nfs4_client *clp);
 241 extern struct nfs4_client *nfs4_find_client(struct in_addr *);
 242 extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
 243
 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);
 255
 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);
 261
 262 extern const nfs4_stateid zero_stateid;
 263
 264 /* nfs4xdr.c */
 265 extern uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus);
 266 extern struct rpc_procinfo nfs4_procedures[];
 267
 268 struct nfs4_mount_data;
 269
 270 /* callback_xdr.c */
 271 extern struct svc_version nfs4_callback_version1;
 272
 273 #else
 274
 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)
 280
 281 #endif /* CONFIG_NFS_V4 */
 282 #endif /* __LINUX_FS_NFS_NFS4_FS.H */