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