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_MANAGER_RUNNING  = 0,
  42         NFS4CLNT_CHECK_LEASE,
  43         NFS4CLNT_LEASE_EXPIRED,
  44         NFS4CLNT_RECLAIM_REBOOT,
  45         NFS4CLNT_RECLAIM_NOGRACE,
  46         NFS4CLNT_DELEGRETURN,
  47         NFS4CLNT_SESSION_SETUP,
  48 };
  49
  50 /*
  51  * struct rpc_sequence ensures that RPC calls are sent in the exact
  52  * order that they appear on the list.
  53  */
  54 struct rpc_sequence {
  55         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  56         spinlock_t lock;                /* Protects the list */
  57         struct list_head list;          /* Defines sequence of RPC calls */
  58 };
  59
  60 #define NFS_SEQID_CONFIRMED 1
  61 struct nfs_seqid_counter {
  62         struct rpc_sequence *sequence;
  63         int flags;
  64         u32 counter;
  65 };
  66
  67 struct nfs_seqid {
  68         struct nfs_seqid_counter *sequence;
  69         struct list_head list;
  70 };
  71
  72 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  73 {
  74         if (seqid_mutating_err(-status))
  75                 seqid->flags |= NFS_SEQID_CONFIRMED;
  76 }
  77
  78 struct nfs_unique_id {
  79         struct rb_node rb_node;
  80         __u64 id;
  81 };
  82
  83 /*
  84  * NFS4 state_owners and lock_owners are simply labels for ordered
  85  * sequences of RPC calls. Their sole purpose is to provide once-only
  86  * semantics by allowing the server to identify replayed requests.
  87  */
  88 struct nfs4_state_owner {
  89         struct nfs_unique_id so_owner_id;
  90         struct nfs_client    *so_client;
  91         struct nfs_server    *so_server;
  92         struct rb_node       so_client_node;
  93
  94         struct rpc_cred      *so_cred;   /* Associated cred */
  95
  96         spinlock_t           so_lock;
  97         atomic_t             so_count;
  98         unsigned long        so_flags;
  99         struct list_head     so_states;
 100         struct list_head     so_delegations;
 101         struct nfs_seqid_counter so_seqid;
 102         struct rpc_sequence  so_sequence;
 103 };
 104
 105 enum {
 106         NFS_OWNER_RECLAIM_REBOOT,
 107         NFS_OWNER_RECLAIM_NOGRACE
 108 };
 109
 110 /*
 111  * struct nfs4_state maintains the client-side state for a given
 112  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 113  *
 114  * OPEN:
 115  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 116  * we need to know how many files are open for reading or writing on a
 117  * given inode. This information too is stored here.
 118  *
 119  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 120  */
 121
 122 struct nfs4_lock_state {
 123         struct list_head        ls_locks;       /* Other lock stateids */
 124         struct nfs4_state *     ls_state;       /* Pointer to open state */
 125         fl_owner_t              ls_owner;       /* POSIX lock owner */
 126 #define NFS_LOCK_INITIALIZED 1
 127         int                     ls_flags;
 128         struct nfs_seqid_counter        ls_seqid;
 129         struct rpc_sequence     ls_sequence;
 130         struct nfs_unique_id    ls_id;
 131         nfs4_stateid            ls_stateid;
 132         atomic_t                ls_count;
 133 };
 134
 135 /* bits for nfs4_state->flags */
 136 enum {
 137         LK_STATE_IN_USE,
 138         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 139         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 140         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 141         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 142         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 143         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 144 };
 145
 146 struct nfs4_state {
 147         struct list_head open_states;   /* List of states for the same state_owner */
 148         struct list_head inode_states;  /* List of states for the same inode */
 149         struct list_head lock_states;   /* List of subservient lock stateids */
 150
 151         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 152         struct inode *inode;            /* Pointer to the inode */
 153
 154         unsigned long flags;            /* Do we hold any locks? */
 155         spinlock_t state_lock;          /* Protects the lock_states list */
 156
 157         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 158         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 159         nfs4_stateid open_stateid;      /* OPEN stateid */
 160
 161         /* The following 3 fields are protected by owner->so_lock */
 162         unsigned int n_rdonly;          /* Number of read-only references */
 163         unsigned int n_wronly;          /* Number of write-only references */
 164         unsigned int n_rdwr;            /* Number of read/write references */
 165         fmode_t state;                  /* State on the server (R,W, or RW) */
 166         atomic_t count;
 167 };
 168
 169
 170 struct nfs4_exception {
 171         long timeout;
 172         int retry;
 173         struct nfs4_state *state;
 174 };
 175
 176 struct nfs4_state_recovery_ops {
 177         int owner_flag_bit;
 178         int state_flag_bit;
 179         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 180         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 181         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 182         struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
 183 };
 184
 185 struct nfs4_state_maintenance_ops {
 186         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *);
 187         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 188         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 189 };
 190
 191 extern const struct dentry_operations nfs4_dentry_operations;
 192 extern const struct inode_operations nfs4_dir_inode_operations;
 193
 194 /* inode.c */
 195 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
 196 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
 197 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
 198
 199
 200 /* nfs4proc.c */
 201 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *);
 202 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
 203 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
 204 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
 205 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 206 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait);
 207 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
 208 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
 209 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 210 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 211                 struct nfs4_fs_locations *fs_locations, struct page *page);
 212
 213 extern struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[];
 214 extern struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[];
 215 #if defined(CONFIG_NFS_V4_1)
 216 extern int nfs4_setup_sequence(struct nfs_client *clp,
 217                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 218                 int cache_reply, struct rpc_task *task);
 219 extern void nfs4_destroy_session(struct nfs4_session *session);
 220 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 221 extern int nfs4_proc_create_session(struct nfs_client *, int reset);
 222 extern int nfs4_proc_destroy_session(struct nfs4_session *);
 223 extern int nfs4_init_session(struct nfs_server *server);
 224 #else /* CONFIG_NFS_v4_1 */
 225 static inline int nfs4_setup_sequence(struct nfs_client *clp,
 226                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 227                 int cache_reply, struct rpc_task *task)
 228 {
 229         return 0;
 230 }
 231
 232 static inline int nfs4_init_session(struct nfs_server *server)
 233 {
 234         return 0;
 235 }
 236 #endif /* CONFIG_NFS_V4_1 */
 237
 238 extern struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[];
 239
 240 extern const u32 nfs4_fattr_bitmap[2];
 241 extern const u32 nfs4_statfs_bitmap[2];
 242 extern const u32 nfs4_pathconf_bitmap[2];
 243 extern const u32 nfs4_fsinfo_bitmap[2];
 244 extern const u32 nfs4_fs_locations_bitmap[2];
 245
 246 /* nfs4renewd.c */
 247 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 248 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 249 extern void nfs4_kill_renewd(struct nfs_client *);
 250 extern void nfs4_renew_state(struct work_struct *);
 251
 252 /* nfs4state.c */
 253 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 254 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 255 #if defined(CONFIG_NFS_V4_1)
 256 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 257 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 258 #endif /* CONFIG_NFS_V4_1 */
 259
 260 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 261 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 262 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 263 extern void nfs4_put_open_state(struct nfs4_state *);
 264 extern void nfs4_close_state(struct path *, struct nfs4_state *, fmode_t);
 265 extern void nfs4_close_sync(struct path *, struct nfs4_state *, fmode_t);
 266 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 267 extern void nfs4_schedule_state_recovery(struct nfs_client *);
 268 extern void nfs4_schedule_state_manager(struct nfs_client *);
 269 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state);
 270 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 271 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 272 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
 273
 274 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
 275 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 276 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 277 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 278 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 279
 280 extern const nfs4_stateid zero_stateid;
 281
 282 /* nfs4xdr.c */
 283 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 284 extern struct rpc_procinfo nfs4_procedures[];
 285
 286 struct nfs4_mount_data;
 287
 288 /* callback_xdr.c */
 289 extern struct svc_version nfs4_callback_version1;
 290
 291 #else
 292
 293 #define nfs4_close_state(a, b, c) do { } while (0)
 294 #define nfs4_close_sync(a, b, c) do { } while (0)
 295
 296 #endif /* CONFIG_NFS_V4 */
 297 #endif /* __LINUX_FS_NFS_NFS4_FS.H */