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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 IS_ENABLED(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_RETURN_IF_CLOSED,
32 NFS_DELEGATION_REFERENCED,
33 NFS_DELEGATION_RETURNING,
34};
35
36int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
37void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
38int nfs4_inode_return_delegation(struct inode *inode);
39int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
40void nfs_inode_return_delegation_noreclaim(struct inode *inode);
41
42struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
43void nfs_server_return_all_delegations(struct nfs_server *);
44void nfs_expire_all_delegations(struct nfs_client *clp);
45void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
46void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
47int nfs_client_return_marked_delegations(struct nfs_client *clp);
48int nfs_delegations_present(struct nfs_client *clp);
49void nfs_remove_bad_delegation(struct inode *inode);
50
51void nfs_delegation_mark_reclaim(struct nfs_client *clp);
52void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
53
54/* NFSv4 delegation-related procedures */
55int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
56int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
57int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
58bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, fmode_t flags);
59
60void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
61int nfs4_have_delegation(struct inode *inode, fmode_t flags);
62
63#endif
64
65static inline int nfs_have_delegated_attributes(struct inode *inode)
66{
67 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
68 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
69}
70
71#endif