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241 lines
8.2 KiB
C
241 lines
8.2 KiB
C
/*
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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_STATE_RECOVER = 0,
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NFS4CLNT_LEASE_EXPIRED,
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};
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/*
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* struct rpc_sequence ensures that RPC calls are sent in the exact
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* order that they appear on the list.
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*/
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struct rpc_sequence {
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struct rpc_wait_queue wait; /* RPC call delay queue */
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spinlock_t lock; /* Protects the list */
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struct list_head list; /* Defines sequence of RPC calls */
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};
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#define NFS_SEQID_CONFIRMED 1
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struct nfs_seqid_counter {
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struct rpc_sequence *sequence;
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int flags;
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u32 counter;
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};
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struct nfs_seqid {
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struct nfs_seqid_counter *sequence;
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struct list_head list;
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};
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static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
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{
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if (seqid_mutating_err(-status))
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seqid->flags |= NFS_SEQID_CONFIRMED;
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}
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struct nfs_unique_id {
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struct rb_node rb_node;
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__u64 id;
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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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struct nfs4_state_owner {
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struct nfs_unique_id so_owner_id;
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struct nfs_client *so_client;
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struct nfs_server *so_server;
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struct rb_node so_client_node;
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struct rpc_cred *so_cred; /* Associated cred */
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spinlock_t so_lock;
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atomic_t so_count;
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struct list_head so_states;
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struct list_head so_delegations;
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struct nfs_seqid_counter so_seqid;
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struct rpc_sequence so_sequence;
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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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struct nfs4_state * ls_state; /* Pointer to open state */
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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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struct nfs_seqid_counter ls_seqid;
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struct nfs_unique_id 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, /* Current stateid is delegation */
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NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
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NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
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NFS_O_RDWR_STATE, /* OPEN stateid has read/write 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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spinlock_t state_lock; /* Protects the lock_states list */
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seqlock_t seqlock; /* Protects the stateid/open_stateid */
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nfs4_stateid stateid; /* Current stateid: may be delegation */
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nfs4_stateid open_stateid; /* OPEN stateid */
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/* The following 3 fields are protected by owner->so_lock */
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unsigned int n_rdonly; /* Number of read-only references */
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unsigned int n_wronly; /* Number of write-only references */
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unsigned int n_rdwr; /* Number of read/write references */
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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 const struct inode_operations nfs4_dir_inode_operations;
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/* inode.c */
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extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
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extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
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extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
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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 nfs_client *, u32, unsigned short, struct rpc_cred *);
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extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
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extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
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extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
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extern int nfs4_do_close(struct path *path, struct nfs4_state *state);
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extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
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extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
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extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
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extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
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struct nfs4_fs_locations *fs_locations, struct page *page);
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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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extern const u32 nfs4_fs_locations_bitmap[2];
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/* nfs4renewd.c */
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extern void nfs4_schedule_state_renewal(struct nfs_client *);
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extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
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extern void nfs4_kill_renewd(struct nfs_client *);
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extern void nfs4_renew_state(struct work_struct *);
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/* nfs4state.c */
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struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
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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 path *, struct nfs4_state *, mode_t);
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extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
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extern void nfs4_schedule_state_recovery(struct nfs_client *);
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extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
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extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
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extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
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extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
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extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
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extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
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extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
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extern void nfs_free_seqid(struct nfs_seqid *seqid);
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extern const nfs4_stateid zero_stateid;
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/* nfs4xdr.c */
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extern __be32 *nfs4_decode_dirent(__be32 *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 nfs4_close_state(a, b, c) 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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