2005-04-16 22:20:36 +00:00
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/*
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* linux/fs/nfs/delegation.h
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*
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* Copyright (c) Trond Myklebust
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*
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* Definitions pertaining to NFS delegated files
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*/
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#ifndef FS_NFS_DELEGATION_H
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#define FS_NFS_DELEGATION_H
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#if defined(CONFIG_NFS_V4)
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/*
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* NFSv4 delegation
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*/
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struct nfs_delegation {
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struct list_head super_list;
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struct rpc_cred *cred;
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struct inode *inode;
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nfs4_stateid stateid;
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int type;
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loff_t maxsize;
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2006-01-03 08:55:37 +00:00
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__u64 change_attr;
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2008-12-23 20:21:39 +00:00
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unsigned long flags;
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2008-12-23 20:21:38 +00:00
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spinlock_t lock;
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2007-07-06 19:12:04 +00:00
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struct rcu_head rcu;
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2005-04-16 22:20:36 +00:00
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};
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2008-12-23 20:21:46 +00:00
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enum {
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NFS_DELEGATION_NEED_RECLAIM = 0,
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NFS_DELEGATION_RETURN,
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};
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2005-04-16 22:20:36 +00:00
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int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
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void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
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2007-07-05 18:55:18 +00:00
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int nfs_inode_return_delegation(struct inode *inode);
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2005-04-16 22:20:36 +00:00
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int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
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2008-01-24 23:14:34 +00:00
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void nfs_inode_return_delegation_noreclaim(struct inode *inode);
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2005-04-16 22:20:36 +00:00
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2006-08-23 00:06:08 +00:00
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struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
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2008-12-23 20:21:46 +00:00
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void nfs_super_return_all_delegations(struct super_block *sb);
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2006-08-23 00:06:08 +00:00
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void nfs_expire_all_delegations(struct nfs_client *clp);
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void nfs_handle_cb_pathdown(struct nfs_client *clp);
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2005-04-16 22:20:36 +00:00
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2006-08-23 00:06:08 +00:00
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void nfs_delegation_mark_reclaim(struct nfs_client *clp);
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void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
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2005-04-16 22:20:36 +00:00
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/* NFSv4 delegation-related procedures */
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2008-01-24 23:14:34 +00:00
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int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
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2007-07-06 19:10:43 +00:00
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int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
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2005-11-04 20:38:11 +00:00
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int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
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2006-03-20 18:44:46 +00:00
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int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
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2005-04-16 22:20:36 +00:00
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static inline int nfs_have_delegation(struct inode *inode, int flags)
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{
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2007-07-06 19:12:04 +00:00
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struct nfs_delegation *delegation;
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int ret = 0;
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2005-04-16 22:20:36 +00:00
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flags &= FMODE_READ|FMODE_WRITE;
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2007-07-06 19:12:04 +00:00
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rcu_read_lock();
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delegation = rcu_dereference(NFS_I(inode)->delegation);
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if (delegation != NULL && (delegation->type & flags) == flags)
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ret = 1;
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rcu_read_unlock();
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return ret;
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2005-04-16 22:20:36 +00:00
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}
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2005-10-18 21:20:19 +00:00
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2005-04-16 22:20:36 +00:00
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#else
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static inline int nfs_have_delegation(struct inode *inode, int flags)
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{
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return 0;
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}
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2005-10-18 21:20:19 +00:00
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static inline int nfs_inode_return_delegation(struct inode *inode)
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{
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return 0;
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}
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2005-04-16 22:20:36 +00:00
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#endif
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#endif
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