xref: /openbmc/linux/fs/nfs/delegation.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 };
26 
27 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
28 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
29 int __nfs_inode_return_delegation(struct inode *inode);
30 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
31 
32 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
33 void nfs_return_all_delegations(struct super_block *sb);
34 void nfs_expire_all_delegations(struct nfs_client *clp);
35 void nfs_handle_cb_pathdown(struct nfs_client *clp);
36 
37 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
38 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
39 
40 /* NFSv4 delegation-related procedures */
41 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
42 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
43 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
44 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
45 
46 static inline int nfs_have_delegation(struct inode *inode, int flags)
47 {
48 	flags &= FMODE_READ|FMODE_WRITE;
49 	smp_rmb();
50 	if ((NFS_I(inode)->delegation_state & flags) == flags)
51 		return 1;
52 	return 0;
53 }
54 
55 static inline int nfs_inode_return_delegation(struct inode *inode)
56 {
57 	int err = 0;
58 
59 	if (NFS_I(inode)->delegation != NULL)
60 		err = __nfs_inode_return_delegation(inode);
61 	return err;
62 }
63 #else
64 static inline int nfs_have_delegation(struct inode *inode, int flags)
65 {
66 	return 0;
67 }
68 
69 static inline int nfs_inode_return_delegation(struct inode *inode)
70 {
71 	return 0;
72 }
73 #endif
74 
75 #endif
76