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 int type;
21 #define NFS_DELEGATION_NEED_RECLAIM 1
22 long flags;
23 loff_t maxsize;
24 __u64 change_attr;
25 struct rcu_head rcu;
26 };
27
28 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
29 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
30 int nfs_inode_return_delegation(struct inode *inode);
31 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
32 void nfs_inode_return_delegation_noreclaim(struct inode *inode);
33
34 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
35 void nfs_return_all_delegations(struct super_block *sb);
36 void nfs_expire_all_delegations(struct nfs_client *clp);
37 void nfs_handle_cb_pathdown(struct nfs_client *clp);
38
39 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
40 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
41
42 /* NFSv4 delegation-related procedures */
43 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
44 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
45 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
46 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
47
48 static inline int nfs_have_delegation(struct inode *inode, int flags)
49 {
50 struct nfs_delegation *delegation;
51 int ret = 0;
52
53 flags &= FMODE_READ|FMODE_WRITE;
54 rcu_read_lock();
55 delegation = rcu_dereference(NFS_I(inode)->delegation);
56 if (delegation != NULL && (delegation->type & flags) == flags)
57 ret = 1;
58 rcu_read_unlock();
59 return ret;
60 }
61
62 #else
63 static inline int nfs_have_delegation(struct inode *inode, int flags)
64 {
65 return 0;
66 }
67
68 static inline int nfs_inode_return_delegation(struct inode *inode)
69 {
70 return 0;
71 }
72 #endif
73
74 #endif
75
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