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Diffstat (limited to 'fs/nfs/nfs4_fs.h')
| -rw-r--r-- | fs/nfs/nfs4_fs.h | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h new file mode 100644 index 000000000000..ec1a22d7b876 --- /dev/null +++ b/fs/nfs/nfs4_fs.h @@ -0,0 +1,253 @@ +/* + * linux/fs/nfs/nfs4_fs.h + * + * Copyright (C) 2005 Trond Myklebust + * + * NFSv4-specific filesystem definitions and declarations + */ + +#ifndef __LINUX_FS_NFS_NFS4_FS_H +#define __LINUX_FS_NFS_NFS4_FS_H + +#ifdef CONFIG_NFS_V4 + +struct idmap; + +/* + * In a seqid-mutating op, this macro controls which error return + * values trigger incrementation of the seqid. + * + * from rfc 3010: + * The client MUST monotonically increment the sequence number for the + * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE + * operations. This is true even in the event that the previous + * operation that used the sequence number received an error. The only + * exception to this rule is if the previous operation received one of + * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID, + * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR, + * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE. + * + */ +#define seqid_mutating_err(err) \ +(((err) != NFSERR_STALE_CLIENTID) && \ + ((err) != NFSERR_STALE_STATEID) && \ + ((err) != NFSERR_BAD_STATEID) && \ + ((err) != NFSERR_BAD_SEQID) && \ + ((err) != NFSERR_BAD_XDR) && \ + ((err) != NFSERR_RESOURCE) && \ + ((err) != NFSERR_NOFILEHANDLE)) + +enum nfs4_client_state { + NFS4CLNT_OK = 0, +}; + +/* + * The nfs4_client identifies our client state to the server. + */ +struct nfs4_client { + struct list_head cl_servers; /* Global list of servers */ + struct in_addr cl_addr; /* Server identifier */ + u64 cl_clientid; /* constant */ + nfs4_verifier cl_confirm; + unsigned long cl_state; + + u32 cl_lockowner_id; + + /* + * The following rwsem ensures exclusive access to the server + * while we recover the state following a lease expiration. + */ + struct rw_semaphore cl_sem; + + struct list_head cl_delegations; + struct list_head cl_state_owners; + struct list_head cl_unused; + int cl_nunused; + spinlock_t cl_lock; + atomic_t cl_count; + + struct rpc_clnt * cl_rpcclient; + struct rpc_cred * cl_cred; + + struct list_head cl_superblocks; /* List of nfs_server structs */ + + unsigned long cl_lease_time; + unsigned long cl_last_renewal; + struct work_struct cl_renewd; + struct work_struct cl_recoverd; + + wait_queue_head_t cl_waitq; + struct rpc_wait_queue cl_rpcwaitq; + + /* used for the setclientid verifier */ + struct timespec cl_boot_time; + + /* idmapper */ + struct idmap * cl_idmap; + + /* Our own IP address, as a null-terminated string. + * This is used to generate the clientid, and the callback address. + */ + char cl_ipaddr[16]; + unsigned char cl_id_uniquifier; +}; + +/* + * NFS4 state_owners and lock_owners are simply labels for ordered + * sequences of RPC calls. Their sole purpose is to provide once-only + * semantics by allowing the server to identify replayed requests. + * + * The ->so_sema is held during all state_owner seqid-mutating operations: + * OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize + * so_seqid. + */ +struct nfs4_state_owner { + struct list_head so_list; /* per-clientid list of state_owners */ + struct nfs4_client *so_client; + u32 so_id; /* 32-bit identifier, unique */ + struct semaphore so_sema; + u32 so_seqid; /* protected by so_sema */ + atomic_t so_count; + + struct rpc_cred *so_cred; /* Associated cred */ + struct list_head so_states; + struct list_head so_delegations; +}; + +/* + * struct nfs4_state maintains the client-side state for a given + * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). + * + * OPEN: + * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, + * we need to know how many files are open for reading or writing on a + * given inode. This information too is stored here. + * + * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) + */ + +struct nfs4_lock_state { + struct list_head ls_locks; /* Other lock stateids */ + struct nfs4_state * ls_state; /* Pointer to open state */ + fl_owner_t ls_owner; /* POSIX lock owner */ +#define NFS_LOCK_INITIALIZED 1 + int ls_flags; + u32 ls_seqid; + u32 ls_id; + nfs4_stateid ls_stateid; + atomic_t ls_count; +}; + +/* bits for nfs4_state->flags */ +enum { + LK_STATE_IN_USE, + NFS_DELEGATED_STATE, +}; + +struct nfs4_state { + struct list_head open_states; /* List of states for the same state_owner */ + struct list_head inode_states; /* List of states for the same inode */ + struct list_head lock_states; /* List of subservient lock stateids */ + + struct nfs4_state_owner *owner; /* Pointer to the open owner */ + struct inode *inode; /* Pointer to the inode */ + + unsigned long flags; /* Do we hold any locks? */ + struct semaphore lock_sema; /* Serializes file locking operations */ + spinlock_t state_lock; /* Protects the lock_states list */ + + nfs4_stateid stateid; + + unsigned int nreaders; + unsigned int nwriters; + int state; /* State on the server (R,W, or RW) */ + atomic_t count; +}; + + +struct nfs4_exception { + long timeout; + int retry; +}; + +struct nfs4_state_recovery_ops { + int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); + int (*recover_lock)(struct nfs4_state *, struct file_lock *); +}; + +extern struct dentry_operations nfs4_dentry_operations; +extern struct inode_operations nfs4_dir_inode_operations; + +/* inode.c */ +extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t); +extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int); +extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t); + + +/* nfs4proc.c */ +extern int nfs4_map_errors(int err); +extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short); +extern int nfs4_proc_setclientid_confirm(struct nfs4_client *); +extern int nfs4_proc_async_renew(struct nfs4_client *); +extern int nfs4_proc_renew(struct nfs4_client *); +extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode); +extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *); +extern int nfs4_open_revalidate(struct inode *, struct dentry *, int); + +extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops; +extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops; + +extern const u32 nfs4_fattr_bitmap[2]; +extern const u32 nfs4_statfs_bitmap[2]; +extern const u32 nfs4_pathconf_bitmap[2]; +extern const u32 nfs4_fsinfo_bitmap[2]; + +/* nfs4renewd.c */ +extern void nfs4_schedule_state_renewal(struct nfs4_client *); +extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); +extern void nfs4_kill_renewd(struct nfs4_client *); +extern void nfs4_renew_state(void *); + +/* nfs4state.c */ +extern void init_nfsv4_state(struct nfs_server *); +extern void destroy_nfsv4_state(struct nfs_server *); +extern struct nfs4_client *nfs4_get_client(struct in_addr *); +extern void nfs4_put_client(struct nfs4_client *clp); +extern int nfs4_init_client(struct nfs4_client *clp); +extern struct nfs4_client *nfs4_find_client(struct in_addr *); +extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *); + +extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *); +extern void nfs4_put_state_owner(struct nfs4_state_owner *); +extern void nfs4_drop_state_owner(struct nfs4_state_owner *); +extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); +extern void nfs4_put_open_state(struct nfs4_state *); +extern void nfs4_close_state(struct nfs4_state *, mode_t); +extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode); +extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp); +extern void nfs4_schedule_state_recovery(struct nfs4_client *); +extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); +extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls); +extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t); + +extern const nfs4_stateid zero_stateid; + +/* nfs4xdr.c */ +extern uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus); +extern struct rpc_procinfo nfs4_procedures[]; + +struct nfs4_mount_data; + +/* callback_xdr.c */ +extern struct svc_version nfs4_callback_version1; + +#else + +#define init_nfsv4_state(server) do { } while (0) +#define destroy_nfsv4_state(server) do { } while (0) +#define nfs4_put_state_owner(inode, owner) do { } while (0) +#define nfs4_put_open_state(state) do { } while (0) +#define nfs4_close_state(a, b) do { } while (0) + +#endif /* CONFIG_NFS_V4 */ +#endif /* __LINUX_FS_NFS_NFS4_FS.H */ |