1/*
2 * linux/fs/nfs/delegation.h
3 *
4 * Copyright (c) Trond Myklebust
5 *
6 * Definitions pertaining to NFS delegated files
7 */
8#ifndef FS_NFS_DELEGATION_H
9#define FS_NFS_DELEGATION_H
10
11#if defined(CONFIG_NFS_V4)
12/*
13 * NFSv4 delegation
14 */
15struct nfs_delegation {
16	struct list_head super_list;
17	struct rpc_cred *cred;
18	struct inode *inode;
19	nfs4_stateid stateid;
20	fmode_t type;
21	loff_t maxsize;
22	__u64 change_attr;
23	unsigned long flags;
24	spinlock_t lock;
25	struct rcu_head rcu;
26};
27
28enum {
29	NFS_DELEGATION_NEED_RECLAIM = 0,
30	NFS_DELEGATION_RETURN,
31	NFS_DELEGATION_REFERENCED,
32};
33
34int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
35void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
36int nfs_inode_return_delegation(struct inode *inode);
37int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
38void nfs_inode_return_delegation_noreclaim(struct inode *inode);
39
40struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
41void nfs_super_return_all_delegations(struct super_block *sb);
42void nfs_expire_all_delegations(struct nfs_client *clp);
43void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
44void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
45void nfs_handle_cb_pathdown(struct nfs_client *clp);
46int nfs_client_return_marked_delegations(struct nfs_client *clp);
47
48void nfs_delegation_mark_reclaim(struct nfs_client *clp);
49void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
50
51/* NFSv4 delegation-related procedures */
52int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
53int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
54int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
55int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
56
57void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
58int nfs_have_delegation(struct inode *inode, fmode_t flags);
59
60#else
61static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
62{
63	return 0;
64}
65
66static inline int nfs_inode_return_delegation(struct inode *inode)
67{
68	return 0;
69}
70#endif
71
72static inline int nfs_have_delegated_attributes(struct inode *inode)
73{
74	return nfs_have_delegation(inode, FMODE_READ) &&
75		!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
76}
77
78#endif
79