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