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 }; 26 27 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 28 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 29 int __nfs_inode_return_delegation(struct inode *inode); 30 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 31 32 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 33 void nfs_return_all_delegations(struct super_block *sb); 34 void nfs_expire_all_delegations(struct nfs_client *clp); 35 void nfs_handle_cb_pathdown(struct nfs_client *clp); 36 37 void nfs_delegation_mark_reclaim(struct nfs_client *clp); 38 void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 39 40 /* NFSv4 delegation-related procedures */ 41 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid); 42 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state); 43 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); 44 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); 45 46 static inline int nfs_have_delegation(struct inode *inode, int flags) 47 { 48 flags &= FMODE_READ|FMODE_WRITE; 49 smp_rmb(); 50 if ((NFS_I(inode)->delegation_state & flags) == flags) 51 return 1; 52 return 0; 53 } 54 55 static inline int nfs_inode_return_delegation(struct inode *inode) 56 { 57 int err = 0; 58 59 if (NFS_I(inode)->delegation != NULL) 60 err = __nfs_inode_return_delegation(inode); 61 return err; 62 } 63 #else 64 static inline int nfs_have_delegation(struct inode *inode, int flags) 65 { 66 return 0; 67 } 68 69 static inline int nfs_inode_return_delegation(struct inode *inode) 70 { 71 return 0; 72 } 73 #endif 74 75 #endif 76