Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
delegation.h
Go to the documentation of this file.
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 IS_ENABLED(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;
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);
37 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
39 
40 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
42 void nfs_expire_all_delegations(struct nfs_client *clp);
46 int nfs_delegations_present(struct nfs_client *clp);
48 
49 void nfs_delegation_mark_reclaim(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);
57 
58 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
60 
61 #endif
62 
63 static inline int nfs_have_delegated_attributes(struct inode *inode)
64 {
65  return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
66  !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
67 }
68 
69 #endif