| /* |
| * linux/fs/nfs/delegation.h |
| * |
| * Copyright (c) Trond Myklebust |
| * |
| * Definitions pertaining to NFS delegated files |
| */ |
| #ifndef FS_NFS_DELEGATION_H |
| #define FS_NFS_DELEGATION_H |
| |
| #if defined(CONFIG_NFS_V4) |
| /* |
| * NFSv4 delegation |
| */ |
| struct nfs_delegation { |
| struct list_head super_list; |
| struct rpc_cred *cred; |
| struct inode *inode; |
| nfs4_stateid stateid; |
| int type; |
| loff_t maxsize; |
| __u64 change_attr; |
| unsigned long flags; |
| spinlock_t lock; |
| struct rcu_head rcu; |
| }; |
| |
| enum { |
| NFS_DELEGATION_NEED_RECLAIM = 0, |
| NFS_DELEGATION_RETURN, |
| }; |
| |
| int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| int nfs_inode_return_delegation(struct inode *inode); |
| int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); |
| void nfs_inode_return_delegation_noreclaim(struct inode *inode); |
| |
| struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); |
| void nfs_super_return_all_delegations(struct super_block *sb); |
| void nfs_expire_all_delegations(struct nfs_client *clp); |
| void nfs_handle_cb_pathdown(struct nfs_client *clp); |
| |
| void nfs_delegation_mark_reclaim(struct nfs_client *clp); |
| void nfs_delegation_reap_unclaimed(struct nfs_client *clp); |
| |
| /* NFSv4 delegation-related procedures */ |
| int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); |
| int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); |
| int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); |
| int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); |
| |
| static inline int nfs_have_delegation(struct inode *inode, int flags) |
| { |
| struct nfs_delegation *delegation; |
| int ret = 0; |
| |
| flags &= FMODE_READ|FMODE_WRITE; |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(inode)->delegation); |
| if (delegation != NULL && (delegation->type & flags) == flags) |
| ret = 1; |
| rcu_read_unlock(); |
| return ret; |
| } |
| |
| #else |
| static inline int nfs_have_delegation(struct inode *inode, int flags) |
| { |
| return 0; |
| } |
| |
| static inline int nfs_inode_return_delegation(struct inode *inode) |
| { |
| return 0; |
| } |
| #endif |
| |
| #endif |