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 */
15 struct 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
28 enum {
29 NFS_DELEGATION_NEED_RECLAIM = 0,
30 NFS_DELEGATION_RETURN,
31 NFS_DELEGATION_REFERENCED,
32 };
33
34 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
35 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
36 int nfs_inode_return_delegation(struct inode *inode);
37 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
38 void nfs_inode_return_delegation_noreclaim(struct inode *inode);
39
40 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
41 void nfs_super_return_all_delegations(struct super_block *sb);
42 void nfs_expire_all_delegations(struct nfs_client *clp);
43 void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
44 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
45 void nfs_handle_cb_pathdown(struct nfs_client *clp);
46 int nfs_client_return_marked_delegations(struct nfs_client *clp);
47 int nfs_delegations_present(struct nfs_client *clp);
48
49 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
50 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
51
52 /* NFSv4 delegation-related procedures */
53 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
54 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
55 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
56 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
57
58 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
59 int nfs_have_delegation(struct inode *inode, fmode_t flags);
60
61 #else
nfs_have_delegation(struct inode * inode,fmode_t flags)62 static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
63 {
64 return 0;
65 }
66
nfs_inode_return_delegation(struct inode * inode)67 static inline int nfs_inode_return_delegation(struct inode *inode)
68 {
69 return 0;
70 }
71 #endif
72
nfs_have_delegated_attributes(struct inode * inode)73 static 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
80