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 void nfs_inode_return_delegation_noreclaim(struct inode *inode); 33 34 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 35 void nfs_return_all_delegations(struct super_block *sb); 36 void nfs_expire_all_delegations(struct nfs_client *clp); 37 void nfs_handle_cb_pathdown(struct nfs_client *clp); 38 39 void nfs_delegation_mark_reclaim(struct nfs_client *clp); 40 void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 41 42 /* NFSv4 delegation-related procedures */ 43 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); 44 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); 45 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); 46 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); 47 48 static inline int nfs_have_delegation(struct inode *inode, int flags) 49 { 50 struct nfs_delegation *delegation; 51 int ret = 0; 52 53 flags &= FMODE_READ|FMODE_WRITE; 54 rcu_read_lock(); 55 delegation = rcu_dereference(NFS_I(inode)->delegation); 56 if (delegation != NULL && (delegation->type & flags) == flags) 57 ret = 1; 58 rcu_read_unlock(); 59 return ret; 60 } 61 62 #else 63 static inline int nfs_have_delegation(struct inode *inode, int flags) 64 { 65 return 0; 66 } 67 68 static inline int nfs_inode_return_delegation(struct inode *inode) 69 { 70 return 0; 71 } 72 #endif 73 74 #endif 75