[mirror_ubuntu-artful-kernel.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;
#define NFS_DELEGATION_NEED_RECLAIM 1
	long flags;
	loff_t maxsize;
	__u64 change_attr;
	spinlock_t lock;
	struct rcu_head rcu;
};

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_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
Commit	Line	Data
1da177e4 LT	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	#define NFS_DELEGATION_NEED_RECLAIM 1
	22	long flags;
	23	loff_t maxsize;
beb2a5ec	24	__u64 change_attr;
34310430	25	spinlock_t lock;
8383e460	26	struct rcu_head rcu;
1da177e4 LT	27	};
	28
	29	int nfs_inode_set_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
	30	void nfs_inode_reclaim_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
90163027	31	int nfs_inode_return_delegation(struct inode *inode);
1da177e4	32	int nfs_async_inode_return_delegation(struct inode inode, const nfs4_stateid stateid);
e6f81075	33	void nfs_inode_return_delegation_noreclaim(struct inode *inode);
1da177e4	34
adfa6f98	35	struct inode nfs_delegation_find_inode(struct nfs_client clp, const struct nfs_fh *fhandle);
1da177e4	36	void nfs_return_all_delegations(struct super_block *sb);
adfa6f98 DH	37	void nfs_expire_all_delegations(struct nfs_client *clp);
adfa6f98 DH	38	void nfs_handle_cb_pathdown(struct nfs_client *clp);
1da177e4	39
adfa6f98 DH	40	void nfs_delegation_mark_reclaim(struct nfs_client *clp);
adfa6f98 DH	41	void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
1da177e4 LT	42
1da177e4 LT	43	/* NFSv4 delegation-related procedures */
e6f81075	44	int nfs4_proc_delegreturn(struct inode inode, struct rpc_cred cred, const nfs4_stateid *stateid, int issync);
13437e12	45	int nfs4_open_delegation_recall(struct nfs_open_context ctx, struct nfs4_state state, const nfs4_stateid *stateid);
888e694c	46	int nfs4_lock_delegation_recall(struct nfs4_state state, struct file_lock fl);
3e4f6290	47	int nfs4_copy_delegation_stateid(nfs4_stateid dst, struct inode inode);
1da177e4 LT	48
	49	static inline int nfs_have_delegation(struct inode *inode, int flags)
	50	{
8383e460 TM	51	struct nfs_delegation *delegation;
	52	int ret = 0;
	53
1da177e4	54	flags &= FMODE_READ\|FMODE_WRITE;
8383e460 TM	55	rcu_read_lock();
	56	delegation = rcu_dereference(NFS_I(inode)->delegation);
	57	if (delegation != NULL && (delegation->type & flags) == flags)
	58	ret = 1;
	59	rcu_read_unlock();
	60	return ret;
1da177e4	61	}
cae7a073	62
1da177e4 LT	63	#else
	64	static inline int nfs_have_delegation(struct inode *inode, int flags)
	65	{
	66	return 0;
	67	}
cae7a073 TM	68
	69	static inline int nfs_inode_return_delegation(struct inode *inode)
	70	{
	71	return 0;
	72	}
1da177e4 LT	73	#endif
	74
	75	#endif