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 fmode_t type; 21 loff_t maxsize; 22 __u64 change_attr; 23 unsigned long flags; 24 spinlock_t lock; 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); 36 int nfs_inode_return_delegation(struct inode *inode); 37 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 38 void nfs_inode_return_delegation_noreclaim(struct inode *inode); 39 40 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 41 void nfs_super_return_all_delegations(struct super_block *sb); 42 void nfs_expire_all_delegations(struct nfs_client *clp); 43 void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags); 44 void nfs_expire_unreferenced_delegations(struct nfs_client *clp); 45 void nfs_handle_cb_pathdown(struct nfs_client *clp); 46 int nfs_client_return_marked_delegations(struct nfs_client *clp); 47 48 void nfs_delegation_mark_reclaim(struct nfs_client *clp); 49 void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 50 51 /* NFSv4 delegation-related procedures */ 52 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); 53 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); 54 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); 55 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); 56 57 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation); 58 int nfs_have_delegation(struct inode *inode, fmode_t flags); 59 60 #else 61 static inline int nfs_have_delegation(struct inode *inode, fmode_t flags) 62 { 63 return 0; 64 } 65 66 static inline int nfs_inode_return_delegation(struct inode *inode) 67 { 68 return 0; 69 } 70 #endif 71 72 static inline int nfs_have_delegated_attributes(struct inode *inode) 73 { 74 return nfs_have_delegation(inode, FMODE_READ) && 75 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED); 76 } 77 78 #endif 79