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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/fs/nfs/delegation.h
4 *
5 * Copyright (c) Trond Myklebust
6 *
7 * Definitions pertaining to NFS delegated files
8 */
9#ifndef FS_NFS_DELEGATION_H
10#define FS_NFS_DELEGATION_H
11
12#if IS_ENABLED(CONFIG_NFS_V4)
13/*
14 * NFSv4 delegation
15 */
16struct nfs_delegation {
17 struct list_head super_list;
18 const struct cred *cred;
19 struct inode *inode;
20 nfs4_stateid stateid;
21 fmode_t type;
22 unsigned long pagemod_limit;
23 __u64 change_attr;
24 unsigned long flags;
25 refcount_t refcount;
26 spinlock_t lock;
27 struct rcu_head rcu;
28};
29
30enum {
31 NFS_DELEGATION_NEED_RECLAIM = 0,
32 NFS_DELEGATION_RETURN,
33 NFS_DELEGATION_RETURN_IF_CLOSED,
34 NFS_DELEGATION_REFERENCED,
35 NFS_DELEGATION_RETURNING,
36 NFS_DELEGATION_REVOKED,
37 NFS_DELEGATION_TEST_EXPIRED,
38 NFS_DELEGATION_INODE_FREEING,
39};
40
41int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
42 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
43void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
44 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
45int nfs4_inode_return_delegation(struct inode *inode);
46void nfs4_inode_return_delegation_on_close(struct inode *inode);
47int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
48void nfs_inode_evict_delegation(struct inode *inode);
49
50struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
51void nfs_server_return_all_delegations(struct nfs_server *);
52void nfs_expire_all_delegations(struct nfs_client *clp);
53void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
54void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
55int nfs_client_return_marked_delegations(struct nfs_client *clp);
56int nfs_delegations_present(struct nfs_client *clp);
57void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
58void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
59
60void nfs_delegation_mark_reclaim(struct nfs_client *clp);
61void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
62
63void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
64void nfs_test_expired_all_delegations(struct nfs_client *clp);
65void nfs_reap_expired_delegations(struct nfs_client *clp);
66
67/* NFSv4 delegation-related procedures */
68int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
69int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
70int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
71bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
72bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
73
74struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
75void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
76int nfs4_have_delegation(struct inode *inode, fmode_t flags);
77int nfs4_check_delegation(struct inode *inode, fmode_t flags);
78bool nfs4_delegation_flush_on_close(const struct inode *inode);
79void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
80 const nfs4_stateid *stateid);
81int nfs4_inode_make_writeable(struct inode *inode);
82
83#endif
84
85static inline int nfs_have_delegated_attributes(struct inode *inode)
86{
87 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
88 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
89}
90
91#endif