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_STATE_RECOVER  = 0,
  42         NFS4CLNT_LEASE_EXPIRED,
  43         NFS4CLNT_RECLAIM_REBOOT,
  44         NFS4CLNT_RECLAIM_NOGRACE,
  45         NFS4CLNT_CB_PATH_DOWN,
  46 };
  47
  48 /*
  49  * struct rpc_sequence ensures that RPC calls are sent in the exact
  50  * order that they appear on the list.
  51  */
  52 struct rpc_sequence {
  53         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  54         spinlock_t lock;                /* Protects the list */
  55         struct list_head list;          /* Defines sequence of RPC calls */
  56 };
  57
  58 #define NFS_SEQID_CONFIRMED 1
  59 struct nfs_seqid_counter {
  60         struct rpc_sequence *sequence;
  61         int flags;
  62         u32 counter;
  63 };
  64
  65 struct nfs_seqid {
  66         struct nfs_seqid_counter *sequence;
  67         struct list_head list;
  68 };
  69
  70 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  71 {
  72         if (seqid_mutating_err(-status))
  73                 seqid->flags |= NFS_SEQID_CONFIRMED;
  74 }
  75
  76 struct nfs_unique_id {
  77         struct rb_node rb_node;
  78         __u64 id;
  79 };
  80
  81 /*
  82  * NFS4 state_owners and lock_owners are simply labels for ordered
  83  * sequences of RPC calls. Their sole purpose is to provide once-only
  84  * semantics by allowing the server to identify replayed requests.
  85  */
  86 struct nfs4_state_owner {
  87         struct nfs_unique_id so_owner_id;
  88         struct nfs_client    *so_client;
  89         struct nfs_server    *so_server;
  90         struct rb_node       so_client_node;
  91
  92         struct rpc_cred      *so_cred;   /* Associated cred */
  93
  94         spinlock_t           so_lock;
  95         atomic_t             so_count;
  96         struct list_head     so_states;
  97         struct list_head     so_delegations;
  98         struct nfs_seqid_counter so_seqid;
  99         struct rpc_sequence  so_sequence;
 100 };
 101
 102 /*
 103  * struct nfs4_state maintains the client-side state for a given
 104  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 105  *
 106  * OPEN:
 107  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 108  * we need to know how many files are open for reading or writing on a
 109  * given inode. This information too is stored here.
 110  *
 111  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 112  */
 113
 114 struct nfs4_lock_state {
 115         struct list_head        ls_locks;       /* Other lock stateids */
 116         struct nfs4_state *     ls_state;       /* Pointer to open state */
 117         fl_owner_t              ls_owner;       /* POSIX lock owner */
 118 #define NFS_LOCK_INITIALIZED 1
 119         int                     ls_flags;
 120         struct nfs_seqid_counter        ls_seqid;
 121         struct rpc_sequence     ls_sequence;
 122         struct nfs_unique_id    ls_id;
 123         nfs4_stateid            ls_stateid;
 124         atomic_t                ls_count;
 125 };
 126
 127 /* bits for nfs4_state->flags */
 128 enum {
 129         LK_STATE_IN_USE,
 130         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 131         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 132         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 133         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 134         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 135         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 136 };
 137
 138 struct nfs4_state {
 139         struct list_head open_states;   /* List of states for the same state_owner */
 140         struct list_head inode_states;  /* List of states for the same inode */
 141         struct list_head lock_states;   /* List of subservient lock stateids */
 142
 143         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 144         struct inode *inode;            /* Pointer to the inode */
 145
 146         unsigned long flags;            /* Do we hold any locks? */
 147         spinlock_t state_lock;          /* Protects the lock_states list */
 148
 149         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 150         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 151         nfs4_stateid open_stateid;      /* OPEN stateid */
 152
 153         /* The following 3 fields are protected by owner->so_lock */
 154         unsigned int n_rdonly;          /* Number of read-only references */
 155         unsigned int n_wronly;          /* Number of write-only references */
 156         unsigned int n_rdwr;            /* Number of read/write references */
 157         int state;                      /* State on the server (R,W, or RW) */
 158         atomic_t count;
 159 };
 160
 161
 162 struct nfs4_exception {
 163         long timeout;
 164         int retry;
 165 };
 166
 167 struct nfs4_state_recovery_ops {
 168         int state_flag_bit;
 169         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 170         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 171 };
 172
 173 extern struct dentry_operations nfs4_dentry_operations;
 174 extern const struct inode_operations nfs4_dir_inode_operations;
 175
 176 /* inode.c */
 177 extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
 178 extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
 179 extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
 180
 181
 182 /* nfs4proc.c */
 183 extern int nfs4_map_errors(int err);
 184 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *);
 185 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
 186 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
 187 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
 188 extern int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait);
 189 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
 190 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
 191 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 192 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 193                 struct nfs4_fs_locations *fs_locations, struct page *page);
 194
 195 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
 196 extern struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops;
 197
 198 extern const u32 nfs4_fattr_bitmap[2];
 199 extern const u32 nfs4_statfs_bitmap[2];
 200 extern const u32 nfs4_pathconf_bitmap[2];
 201 extern const u32 nfs4_fsinfo_bitmap[2];
 202 extern const u32 nfs4_fs_locations_bitmap[2];
 203
 204 /* nfs4renewd.c */
 205 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 206 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 207 extern void nfs4_kill_renewd(struct nfs_client *);
 208 extern void nfs4_renew_state(struct work_struct *);
 209
 210 /* nfs4state.c */
 211 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 212
 213 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 214 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 215 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 216 extern void nfs4_put_open_state(struct nfs4_state *);
 217 extern void nfs4_close_state(struct path *, struct nfs4_state *, mode_t);
 218 extern void nfs4_close_sync(struct path *, struct nfs4_state *, mode_t);
 219 extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
 220 extern void nfs4_schedule_state_recovery(struct nfs_client *);
 221 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 222 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 223 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
 224
 225 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
 226 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 227 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 228 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 229 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 230
 231 extern const nfs4_stateid zero_stateid;
 232
 233 /* nfs4xdr.c */
 234 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 235 extern struct rpc_procinfo nfs4_procedures[];
 236
 237 struct nfs4_mount_data;
 238
 239 /* callback_xdr.c */
 240 extern struct svc_version nfs4_callback_version1;
 241
 242 #else
 243
 244 #define nfs4_close_state(a, b, c) do { } while (0)
 245 #define nfs4_close_sync(a, b, c) do { } while (0)
 246
 247 #endif /* CONFIG_NFS_V4 */
 248 #endif /* __LINUX_FS_NFS_NFS4_FS.H */