251 lines
8.3 KiB
C
251 lines
8.3 KiB
C
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/*
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* linux/fs/nfs/nfs4_fs.h
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*
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* Copyright (C) 2005 Trond Myklebust
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*
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* NFSv4-specific filesystem definitions and declarations
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*/
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#ifndef __LINUX_FS_NFS_NFS4_FS_H
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#define __LINUX_FS_NFS_NFS4_FS_H
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#ifdef CONFIG_NFS_V4
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struct idmap;
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/*
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* In a seqid-mutating op, this macro controls which error return
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* values trigger incrementation of the seqid.
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*
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* from rfc 3010:
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* The client MUST monotonically increment the sequence number for the
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* CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
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* operations. This is true even in the event that the previous
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* operation that used the sequence number received an error. The only
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* exception to this rule is if the previous operation received one of
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* the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
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* NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
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* NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
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*
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*/
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#define seqid_mutating_err(err) \
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(((err) != NFSERR_STALE_CLIENTID) && \
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((err) != NFSERR_STALE_STATEID) && \
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((err) != NFSERR_BAD_STATEID) && \
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((err) != NFSERR_BAD_SEQID) && \
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((err) != NFSERR_BAD_XDR) && \
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((err) != NFSERR_RESOURCE) && \
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((err) != NFSERR_NOFILEHANDLE))
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enum nfs4_client_state {
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NFS4CLNT_OK = 0,
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};
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/*
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* The nfs4_client identifies our client state to the server.
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*/
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struct nfs4_client {
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struct list_head cl_servers; /* Global list of servers */
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struct in_addr cl_addr; /* Server identifier */
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u64 cl_clientid; /* constant */
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nfs4_verifier cl_confirm;
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unsigned long cl_state;
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u32 cl_lockowner_id;
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/*
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* The following rwsem ensures exclusive access to the server
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* while we recover the state following a lease expiration.
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*/
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struct rw_semaphore cl_sem;
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struct list_head cl_delegations;
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struct list_head cl_state_owners;
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struct list_head cl_unused;
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int cl_nunused;
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spinlock_t cl_lock;
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atomic_t cl_count;
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struct rpc_clnt * cl_rpcclient;
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struct rpc_cred * cl_cred;
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struct list_head cl_superblocks; /* List of nfs_server structs */
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unsigned long cl_lease_time;
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unsigned long cl_last_renewal;
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struct work_struct cl_renewd;
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struct work_struct cl_recoverd;
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wait_queue_head_t cl_waitq;
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struct rpc_wait_queue cl_rpcwaitq;
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/* used for the setclientid verifier */
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struct timespec cl_boot_time;
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/* idmapper */
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struct idmap * cl_idmap;
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/* Our own IP address, as a null-terminated string.
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* This is used to generate the clientid, and the callback address.
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*/
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char cl_ipaddr[16];
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unsigned char cl_id_uniquifier;
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};
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/*
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* NFS4 state_owners and lock_owners are simply labels for ordered
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* sequences of RPC calls. Their sole purpose is to provide once-only
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* semantics by allowing the server to identify replayed requests.
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*
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* The ->so_sema is held during all state_owner seqid-mutating operations:
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* OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
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* so_seqid.
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*/
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struct nfs4_state_owner {
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struct list_head so_list; /* per-clientid list of state_owners */
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struct nfs4_client *so_client;
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u32 so_id; /* 32-bit identifier, unique */
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struct semaphore so_sema;
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u32 so_seqid; /* protected by so_sema */
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atomic_t so_count;
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struct rpc_cred *so_cred; /* Associated cred */
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struct list_head so_states;
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struct list_head so_delegations;
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};
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/*
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* struct nfs4_state maintains the client-side state for a given
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* (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
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*
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* OPEN:
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* In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
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* we need to know how many files are open for reading or writing on a
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* given inode. This information too is stored here.
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*
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* LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
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*/
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struct nfs4_lock_state {
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struct list_head ls_locks; /* Other lock stateids */
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fl_owner_t ls_owner; /* POSIX lock owner */
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#define NFS_LOCK_INITIALIZED 1
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int ls_flags;
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u32 ls_seqid;
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u32 ls_id;
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nfs4_stateid ls_stateid;
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atomic_t ls_count;
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};
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/* bits for nfs4_state->flags */
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enum {
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LK_STATE_IN_USE,
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NFS_DELEGATED_STATE,
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};
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struct nfs4_state {
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struct list_head open_states; /* List of states for the same state_owner */
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struct list_head inode_states; /* List of states for the same inode */
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struct list_head lock_states; /* List of subservient lock stateids */
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struct nfs4_state_owner *owner; /* Pointer to the open owner */
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struct inode *inode; /* Pointer to the inode */
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unsigned long flags; /* Do we hold any locks? */
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struct semaphore lock_sema; /* Serializes file locking operations */
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rwlock_t state_lock; /* Protects the lock_states list */
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nfs4_stateid stateid;
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unsigned int nreaders;
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unsigned int nwriters;
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int state; /* State on the server (R,W, or RW) */
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atomic_t count;
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};
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struct nfs4_exception {
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long timeout;
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int retry;
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};
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struct nfs4_state_recovery_ops {
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int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
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int (*recover_lock)(struct nfs4_state *, struct file_lock *);
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};
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extern struct dentry_operations nfs4_dentry_operations;
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extern struct inode_operations nfs4_dir_inode_operations;
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/* nfs4proc.c */
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extern int nfs4_map_errors(int err);
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extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
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extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
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extern int nfs4_proc_async_renew(struct nfs4_client *);
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extern int nfs4_proc_renew(struct nfs4_client *);
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extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode);
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extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
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extern int nfs4_open_revalidate(struct inode *, struct dentry *, int);
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extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
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extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
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extern const u32 nfs4_fattr_bitmap[2];
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extern const u32 nfs4_statfs_bitmap[2];
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extern const u32 nfs4_pathconf_bitmap[2];
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extern const u32 nfs4_fsinfo_bitmap[2];
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/* nfs4renewd.c */
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extern void nfs4_schedule_state_renewal(struct nfs4_client *);
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extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
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extern void nfs4_kill_renewd(struct nfs4_client *);
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extern void nfs4_renew_state(void *);
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/* nfs4state.c */
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extern void init_nfsv4_state(struct nfs_server *);
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extern void destroy_nfsv4_state(struct nfs_server *);
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extern struct nfs4_client *nfs4_get_client(struct in_addr *);
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extern void nfs4_put_client(struct nfs4_client *clp);
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extern int nfs4_init_client(struct nfs4_client *clp);
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extern struct nfs4_client *nfs4_find_client(struct in_addr *);
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extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
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extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
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extern void nfs4_put_state_owner(struct nfs4_state_owner *);
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extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
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extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
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extern void nfs4_put_open_state(struct nfs4_state *);
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extern void nfs4_close_state(struct nfs4_state *, mode_t);
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extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode);
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extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp);
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extern void nfs4_schedule_state_recovery(struct nfs4_client *);
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extern struct nfs4_lock_state *nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t);
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extern struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t);
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extern void nfs4_put_lock_state(struct nfs4_lock_state *state);
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extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls);
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extern void nfs4_notify_setlk(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
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extern void nfs4_notify_unlck(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
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extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
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extern const nfs4_stateid zero_stateid;
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/* nfs4xdr.c */
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extern uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus);
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extern struct rpc_procinfo nfs4_procedures[];
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struct nfs4_mount_data;
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/* callback_xdr.c */
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extern struct svc_version nfs4_callback_version1;
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#else
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#define init_nfsv4_state(server) do { } while (0)
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#define destroy_nfsv4_state(server) do { } while (0)
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#define nfs4_put_state_owner(inode, owner) do { } while (0)
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#define nfs4_put_open_state(state) do { } while (0)
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#define nfs4_close_state(a, b) do { } while (0)
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#endif /* CONFIG_NFS_V4 */
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#endif /* __LINUX_FS_NFS_NFS4_FS.H */
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