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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 int type;
21#define NFS_DELEGATION_NEED_RECLAIM 1
22 long flags;
23 loff_t maxsize;
Trond Myklebustbeb2a5e2006-01-03 09:55:37 +010024 __u64 change_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025};
26
27int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
28void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
Trond Myklebustcae7a072005-10-18 14:20:19 -070029int __nfs_inode_return_delegation(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
31
32struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle);
33void nfs_return_all_delegations(struct super_block *sb);
Trond Myklebust58d97142006-01-03 09:55:24 +010034void nfs_expire_all_delegations(struct nfs4_client *clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035void nfs_handle_cb_pathdown(struct nfs4_client *clp);
36
37void nfs_delegation_mark_reclaim(struct nfs4_client *clp);
38void nfs_delegation_reap_unclaimed(struct nfs4_client *clp);
39
40/* NFSv4 delegation-related procedures */
41int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
42int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
Trond Myklebust888e6942005-11-04 15:38:11 -050043int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45static inline int nfs_have_delegation(struct inode *inode, int flags)
46{
47 flags &= FMODE_READ|FMODE_WRITE;
48 smp_rmb();
49 if ((NFS_I(inode)->delegation_state & flags) == flags)
50 return 1;
51 return 0;
52}
Trond Myklebustcae7a072005-10-18 14:20:19 -070053
54static inline int nfs_inode_return_delegation(struct inode *inode)
55{
56 int err = 0;
57
58 if (NFS_I(inode)->delegation != NULL)
59 err = __nfs_inode_return_delegation(inode);
60 return err;
61}
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#else
63static inline int nfs_have_delegation(struct inode *inode, int flags)
64{
65 return 0;
66}
Trond Myklebustcae7a072005-10-18 14:20:19 -070067
68static inline int nfs_inode_return_delegation(struct inode *inode)
69{
70 return 0;
71}
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#endif
73
74#endif