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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;
Trond Myklebustbd7bf9d2008-12-23 15:21:53 -050020 fmode_t type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 loff_t maxsize;
Trond Myklebustbeb2a5e2006-01-03 09:55:37 +010022 __u64 change_attr;
Trond Myklebust15c831b2008-12-23 15:21:39 -050023 unsigned long flags;
Trond Myklebust34310432008-12-23 15:21:38 -050024 spinlock_t lock;
Trond Myklebust8383e462007-07-06 15:12:04 -040025 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026};
27
Trond Myklebust515d8612008-12-23 15:21:46 -050028enum {
29 NFS_DELEGATION_NEED_RECLAIM = 0,
30 NFS_DELEGATION_RETURN,
Trond Myklebustb7391f42008-12-23 15:21:52 -050031 NFS_DELEGATION_REFERENCED,
Trond Myklebust515d8612008-12-23 15:21:46 -050032};
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
35void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
Trond Myklebust90163022007-07-05 14:55:18 -040036int nfs_inode_return_delegation(struct inode *inode);
Trond Myklebuste047a102010-06-16 09:52:27 -040037int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
Trond Myklebuste6f81072008-01-24 18:14:34 -050038void nfs_inode_return_delegation_noreclaim(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
David Howellsadfa6f92006-08-22 20:06:08 -040040struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
Trond Myklebust515d8612008-12-23 15:21:46 -050041void nfs_super_return_all_delegations(struct super_block *sb);
David Howellsadfa6f92006-08-22 20:06:08 -040042void nfs_expire_all_delegations(struct nfs_client *clp);
Alexandros Batsakis31f09602009-12-05 13:27:02 -050043void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
Trond Myklebustb7391f42008-12-23 15:21:52 -050044void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
David Howellsadfa6f92006-08-22 20:06:08 -040045void nfs_handle_cb_pathdown(struct nfs_client *clp);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -050046int nfs_client_return_marked_delegations(struct nfs_client *clp);
Chuck Leverd3978bb2010-12-24 01:33:04 +000047int nfs_delegations_present(struct nfs_client *clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
David Howellsadfa6f92006-08-22 20:06:08 -040049void nfs_delegation_mark_reclaim(struct nfs_client *clp);
50void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/* NFSv4 delegation-related procedures */
Trond Myklebuste6f81072008-01-24 18:14:34 -050053int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
Trond Myklebust13437e12007-07-06 15:10:43 -040054int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
Trond Myklebust888e6942005-11-04 15:38:11 -050055int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
Trond Myklebust3e4f6292006-03-20 13:44:46 -050056int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Trond Myklebustb7391f42008-12-23 15:21:52 -050058void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
Trond Myklebustbd7bf9d2008-12-23 15:21:53 -050059int nfs_have_delegation(struct inode *inode, fmode_t flags);
Trond Myklebustcae7a072005-10-18 14:20:19 -070060
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#else
Trond Myklebustbd7bf9d2008-12-23 15:21:53 -050062static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 return 0;
65}
Trond Myklebustcae7a072005-10-18 14:20:19 -070066
67static inline int nfs_inode_return_delegation(struct inode *inode)
68{
69 return 0;
70}
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#endif
72
Trond Myklebustb4d23142010-03-10 15:21:44 -050073static inline int nfs_have_delegated_attributes(struct inode *inode)
74{
75 return nfs_have_delegation(inode, FMODE_READ) &&
76 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
77}
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#endif