11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/delegation.h 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (c) Trond Myklebust 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Definitions pertaining to NFS delegated files 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds #ifndef FS_NFS_DELEGATION_H 91da177e4SLinus Torvalds #define FS_NFS_DELEGATION_H 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #if defined(CONFIG_NFS_V4) 121da177e4SLinus Torvalds /* 131da177e4SLinus Torvalds * NFSv4 delegation 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds struct nfs_delegation { 161da177e4SLinus Torvalds struct list_head super_list; 171da177e4SLinus Torvalds struct rpc_cred *cred; 181da177e4SLinus Torvalds struct inode *inode; 191da177e4SLinus Torvalds nfs4_stateid stateid; 201da177e4SLinus Torvalds int type; 211da177e4SLinus Torvalds #define NFS_DELEGATION_NEED_RECLAIM 1 221da177e4SLinus Torvalds long flags; 231da177e4SLinus Torvalds loff_t maxsize; 24beb2a5ecSTrond Myklebust __u64 change_attr; 25*8383e460STrond Myklebust struct rcu_head rcu; 261da177e4SLinus Torvalds }; 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 291da177e4SLinus Torvalds void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); 3090163027STrond Myklebust int nfs_inode_return_delegation(struct inode *inode); 311da177e4SLinus Torvalds int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 321da177e4SLinus Torvalds 33adfa6f98SDavid Howells struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 341da177e4SLinus Torvalds void nfs_return_all_delegations(struct super_block *sb); 35adfa6f98SDavid Howells void nfs_expire_all_delegations(struct nfs_client *clp); 36adfa6f98SDavid Howells void nfs_handle_cb_pathdown(struct nfs_client *clp); 371da177e4SLinus Torvalds 38adfa6f98SDavid Howells void nfs_delegation_mark_reclaim(struct nfs_client *clp); 39adfa6f98SDavid Howells void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds /* NFSv4 delegation-related procedures */ 421da177e4SLinus Torvalds int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid); 4313437e12STrond Myklebust int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); 44888e694cSTrond Myklebust int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); 453e4f6290STrond Myklebust int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static inline int nfs_have_delegation(struct inode *inode, int flags) 481da177e4SLinus Torvalds { 49*8383e460STrond Myklebust struct nfs_delegation *delegation; 50*8383e460STrond Myklebust int ret = 0; 51*8383e460STrond Myklebust 521da177e4SLinus Torvalds flags &= FMODE_READ|FMODE_WRITE; 53*8383e460STrond Myklebust rcu_read_lock(); 54*8383e460STrond Myklebust delegation = rcu_dereference(NFS_I(inode)->delegation); 55*8383e460STrond Myklebust if (delegation != NULL && (delegation->type & flags) == flags) 56*8383e460STrond Myklebust ret = 1; 57*8383e460STrond Myklebust rcu_read_unlock(); 58*8383e460STrond Myklebust return ret; 591da177e4SLinus Torvalds } 60cae7a073STrond Myklebust 611da177e4SLinus Torvalds #else 621da177e4SLinus Torvalds static inline int nfs_have_delegation(struct inode *inode, int flags) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds return 0; 651da177e4SLinus Torvalds } 66cae7a073STrond Myklebust 67cae7a073STrond Myklebust static inline int nfs_inode_return_delegation(struct inode *inode) 68cae7a073STrond Myklebust { 69cae7a073STrond Myklebust return 0; 70cae7a073STrond Myklebust } 711da177e4SLinus Torvalds #endif 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds #endif 74