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 };
25
26 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
27 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
28 int nfs_inode_return_delegation(struct inode *inode);
29 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
30
31 struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle);
32 void nfs_return_all_delegations(struct super_block *sb);
33 void nfs_handle_cb_pathdown(struct nfs4_client *clp);
34
35 void nfs_delegation_mark_reclaim(struct nfs4_client *clp);
36 void nfs_delegation_reap_unclaimed(struct nfs4_client *clp);
37
38 /* NFSv4 delegation-related procedures */
39 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
40 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
41
42 static inline int nfs_have_delegation(struct inode *inode, int flags)
43 {
44 flags &= FMODE_READ|FMODE_WRITE;
45 smp_rmb();
46 if ((NFS_I(inode)->delegation_state & flags) == flags)
47 return 1;
48 return 0;
49 }
50 #else
51 static inline int nfs_have_delegation(struct inode *inode, int flags)
52 {
53 return 0;
54 }
55 #endif
56
57 #endif
58
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