[deliverable/linux.git] / fs / nfs / delegation.h

/*
 * 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_client_return_marked_delegations(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
Commit	Line	Data
	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	loff_t maxsize;
	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	};
	32
	33	int nfs_inode_set_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
	34	void nfs_inode_reclaim_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
	35	int nfs_inode_return_delegation(struct inode *inode);
	36	int nfs_async_inode_return_delegation(struct inode inode, const nfs4_stateid stateid);
	37	void nfs_inode_return_delegation_noreclaim(struct inode *inode);
	38
	39	struct inode nfs_delegation_find_inode(struct nfs_client clp, const struct nfs_fh *fhandle);
	40	void nfs_super_return_all_delegations(struct super_block *sb);
	41	void nfs_expire_all_delegations(struct nfs_client *clp);
	42	void nfs_handle_cb_pathdown(struct nfs_client *clp);
	43	void nfs_client_return_marked_delegations(struct nfs_client *clp);
	44
	45	void nfs_delegation_mark_reclaim(struct nfs_client *clp);
	46	void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
	47
	48	/* NFSv4 delegation-related procedures */
	49	int nfs4_proc_delegreturn(struct inode inode, struct rpc_cred cred, const nfs4_stateid *stateid, int issync);
	50	int nfs4_open_delegation_recall(struct nfs_open_context ctx, struct nfs4_state state, const nfs4_stateid *stateid);
	51	int nfs4_lock_delegation_recall(struct nfs4_state state, struct file_lock fl);
	52	int nfs4_copy_delegation_stateid(nfs4_stateid dst, struct inode inode);
	53
	54	static inline int nfs_have_delegation(struct inode *inode, int flags)
	55	{
	56	struct nfs_delegation *delegation;
	57	int ret = 0;
	58
	59	flags &= FMODE_READ\|FMODE_WRITE;
	60	rcu_read_lock();
	61	delegation = rcu_dereference(NFS_I(inode)->delegation);
	62	if (delegation != NULL && (delegation->type & flags) == flags)
	63	ret = 1;
	64	rcu_read_unlock();
	65	return ret;
	66	}
	67
	68	#else
	69	static inline int nfs_have_delegation(struct inode *inode, int flags)
	70	{
	71	return 0;
	72	}
	73
	74	static inline int nfs_inode_return_delegation(struct inode *inode)
	75	{
	76	return 0;
	77	}
	78	#endif
	79
	80	#endif