Commit | Line | Data |
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1da177e4 LT |
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; | |
1da177e4 | 21 | loff_t maxsize; |
beb2a5ec | 22 | __u64 change_attr; |
15c831bf | 23 | unsigned long flags; |
34310430 | 24 | spinlock_t lock; |
8383e460 | 25 | struct rcu_head rcu; |
1da177e4 LT |
26 | }; |
27 | ||
515d8611 TM |
28 | enum { |
29 | NFS_DELEGATION_NEED_RECLAIM = 0, | |
30 | NFS_DELEGATION_RETURN, | |
31 | }; | |
32 | ||
1da177e4 LT |
33 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
34 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); | |
90163027 | 35 | int nfs_inode_return_delegation(struct inode *inode); |
1da177e4 | 36 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); |
e6f81075 | 37 | void nfs_inode_return_delegation_noreclaim(struct inode *inode); |
1da177e4 | 38 | |
adfa6f98 | 39 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); |
515d8611 | 40 | void nfs_super_return_all_delegations(struct super_block *sb); |
adfa6f98 DH |
41 | void nfs_expire_all_delegations(struct nfs_client *clp); |
42 | void nfs_handle_cb_pathdown(struct nfs_client *clp); | |
707fb4b3 | 43 | void nfs_client_return_marked_delegations(struct nfs_client *clp); |
1da177e4 | 44 | |
adfa6f98 DH |
45 | void nfs_delegation_mark_reclaim(struct nfs_client *clp); |
46 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp); | |
1da177e4 LT |
47 | |
48 | /* NFSv4 delegation-related procedures */ | |
e6f81075 | 49 | int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); |
13437e12 | 50 | int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); |
888e694c | 51 | int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); |
3e4f6290 | 52 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); |
1da177e4 LT |
53 | |
54 | static inline int nfs_have_delegation(struct inode *inode, int flags) | |
55 | { | |
8383e460 TM |
56 | struct nfs_delegation *delegation; |
57 | int ret = 0; | |
58 | ||
1da177e4 | 59 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
60 | rcu_read_lock(); |
61 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
62 | if (delegation != NULL && (delegation->type & flags) == flags) | |
63 | ret = 1; | |
64 | rcu_read_unlock(); | |
65 | return ret; | |
1da177e4 | 66 | } |
cae7a073 | 67 | |
1da177e4 LT |
68 | #else |
69 | static inline int nfs_have_delegation(struct inode *inode, int flags) | |
70 | { | |
71 | return 0; | |
72 | } | |
cae7a073 TM |
73 | |
74 | static inline int nfs_inode_return_delegation(struct inode *inode) | |
75 | { | |
76 | return 0; | |
77 | } | |
1da177e4 LT |
78 | #endif |
79 | ||
80 | #endif |