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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 test_gen;
25 unsigned long flags;
26 refcount_t refcount;
27 spinlock_t lock;
28 struct rcu_head rcu;
29};
30
31enum {
32 NFS_DELEGATION_NEED_RECLAIM = 0,
33 NFS_DELEGATION_RETURN,
34 NFS_DELEGATION_RETURN_IF_CLOSED,
35 NFS_DELEGATION_REFERENCED,
36 NFS_DELEGATION_RETURNING,
37 NFS_DELEGATION_REVOKED,
38 NFS_DELEGATION_TEST_EXPIRED,
39 NFS_DELEGATION_INODE_FREEING,
40 NFS_DELEGATION_RETURN_DELAYED,
41};
42
43int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
44 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
45void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
46 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
47int nfs4_inode_return_delegation(struct inode *inode);
48void nfs4_inode_return_delegation_on_close(struct inode *inode);
49int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
50void nfs_inode_evict_delegation(struct inode *inode);
51
52struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
53void nfs_server_return_all_delegations(struct nfs_server *);
54void nfs_expire_all_delegations(struct nfs_client *clp);
55void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
56void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
57int nfs_client_return_marked_delegations(struct nfs_client *clp);
58int nfs_delegations_present(struct nfs_client *clp);
59void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
60void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
61
62void nfs_delegation_mark_reclaim(struct nfs_client *clp);
63void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
64
65void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
66void nfs_test_expired_all_delegations(struct nfs_client *clp);
67void nfs_reap_expired_delegations(struct nfs_client *clp);
68
69/* NFSv4 delegation-related procedures */
70int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
71int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
72int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
73bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
74bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
75
76struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
77void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
78int nfs4_have_delegation(struct inode *inode, fmode_t flags);
79int nfs4_check_delegation(struct inode *inode, fmode_t flags);
80bool nfs4_delegation_flush_on_close(const struct inode *inode);
81void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
82 const nfs4_stateid *stateid);
83int nfs4_inode_make_writeable(struct inode *inode);
84
85#endif
86
87static inline int nfs_have_delegated_attributes(struct inode *inode)
88{
89 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
90}
91
92#endif
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 unsigned long pagemod_limit;
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 NFS_DELEGATION_REVOKED,
35 NFS_DELEGATION_TEST_EXPIRED,
36};
37
38int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
39void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
40int nfs4_inode_return_delegation(struct inode *inode);
41int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
42void nfs_inode_return_delegation_noreclaim(struct inode *inode);
43
44struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
45void nfs_server_return_all_delegations(struct nfs_server *);
46void nfs_expire_all_delegations(struct nfs_client *clp);
47void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
48void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
49int nfs_client_return_marked_delegations(struct nfs_client *clp);
50int nfs_delegations_present(struct nfs_client *clp);
51void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
52
53void nfs_delegation_mark_reclaim(struct nfs_client *clp);
54void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
55
56void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
57void nfs_reap_expired_delegations(struct nfs_client *clp);
58
59/* NFSv4 delegation-related procedures */
60int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
61int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type);
62int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
63bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred);
64
65void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
66int nfs4_have_delegation(struct inode *inode, fmode_t flags);
67int nfs4_check_delegation(struct inode *inode, fmode_t flags);
68bool nfs4_delegation_flush_on_close(const struct inode *inode);
69void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
70 const nfs4_stateid *stateid);
71
72#endif
73
74static inline int nfs_have_delegated_attributes(struct inode *inode)
75{
76 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
77 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
78}
79
80#endif