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