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 IS_ENABLED(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 unsigned long pagemod_limit; 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_RETURN_IF_CLOSED, 32 NFS_DELEGATION_REFERENCED, 33 NFS_DELEGATION_RETURNING, 34 NFS_DELEGATION_REVOKED, 35 }; 36 37 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 38 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 39 int nfs4_inode_return_delegation(struct inode *inode); 40 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 41 void nfs_inode_return_delegation_noreclaim(struct inode *inode); 42 43 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 44 void nfs_server_return_all_delegations(struct nfs_server *); 45 void nfs_expire_all_delegations(struct nfs_client *clp); 46 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags); 47 void nfs_expire_unreferenced_delegations(struct nfs_client *clp); 48 int nfs_client_return_marked_delegations(struct nfs_client *clp); 49 int nfs_delegations_present(struct nfs_client *clp); 50 void nfs_remove_bad_delegation(struct inode *inode); 51 52 void nfs_delegation_mark_reclaim(struct nfs_client *clp); 53 void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 54 55 /* NFSv4 delegation-related procedures */ 56 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); 57 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type); 58 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid); 59 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred); 60 61 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation); 62 int nfs4_have_delegation(struct inode *inode, fmode_t flags); 63 int nfs4_check_delegation(struct inode *inode, fmode_t flags); 64 bool nfs4_delegation_flush_on_close(const struct inode *inode); 65 66 #endif 67 68 static inline int nfs_have_delegated_attributes(struct inode *inode) 69 { 70 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) && 71 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED); 72 } 73 74 #endif 75