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 }; 25 26 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 27 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 28 int __nfs_inode_return_delegation(struct inode *inode); 29 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 30 31 struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle); 32 void nfs_return_all_delegations(struct super_block *sb); 33 void nfs_handle_cb_pathdown(struct nfs4_client *clp); 34 35 void nfs_delegation_mark_reclaim(struct nfs4_client *clp); 36 void nfs_delegation_reap_unclaimed(struct nfs4_client *clp); 37 38 /* NFSv4 delegation-related procedures */ 39 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid); 40 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state); 41 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); 42 43 static inline int nfs_have_delegation(struct inode *inode, int flags) 44 { 45 flags &= FMODE_READ|FMODE_WRITE; 46 smp_rmb(); 47 if ((NFS_I(inode)->delegation_state & flags) == flags) 48 return 1; 49 return 0; 50 } 51 52 static inline int nfs_inode_return_delegation(struct inode *inode) 53 { 54 int err = 0; 55 56 if (NFS_I(inode)->delegation != NULL) 57 err = __nfs_inode_return_delegation(inode); 58 return err; 59 } 60 #else 61 static inline int nfs_have_delegation(struct inode *inode, int 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 #endif 73