[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;
	fmode_t 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,
	NFS_DELEGATION_REFERENCED,
};

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_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
int nfs_client_return_marked_delegations(struct nfs_client *clp);
int nfs_delegations_present(struct nfs_client *clp);
void nfs_remove_bad_delegation(struct inode *inode);

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);
bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, fmode_t flags);

void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
int nfs_have_delegation(struct inode *inode, fmode_t flags);

#else
static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
{
	return 0;
}

static inline int nfs_inode_return_delegation(struct inode *inode)
{
	nfs_wb_all(inode);
	return 0;
}
#endif

static inline int nfs_have_delegated_attributes(struct inode *inode)
{
	return nfs_have_delegation(inode, FMODE_READ) &&
		!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
}

#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;
bd7bf9d5	20	fmode_t type;
1da177e4	21	loff_t maxsize;
beb2a5ec	22	__u64 change_attr;
15c831bf	23	unsigned long flags;
34310430	24	spinlock_t lock;
8383e460	25	struct rcu_head rcu;
1da177e4 LT	26	};
1da177e4 LT	27
515d8611 TM	28	enum {
	29	NFS_DELEGATION_NEED_RECLAIM = 0,
	30	NFS_DELEGATION_RETURN,
b7391f44	31	NFS_DELEGATION_REFERENCED,
515d8611 TM	32	};
515d8611 TM	33
1da177e4 LT	34	int nfs_inode_set_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
1da177e4 LT	35	void nfs_inode_reclaim_delegation(struct inode inode, struct rpc_cred cred, struct nfs_openres *res);
90163027	36	int nfs_inode_return_delegation(struct inode *inode);
e047a10c	37	int nfs_async_inode_return_delegation(struct inode inode, const nfs4_stateid stateid);
e6f81075	38	void nfs_inode_return_delegation_noreclaim(struct inode *inode);
1da177e4	39
adfa6f98	40	struct inode nfs_delegation_find_inode(struct nfs_client clp, const struct nfs_fh *fhandle);
515d8611	41	void nfs_super_return_all_delegations(struct super_block *sb);
adfa6f98	42	void nfs_expire_all_delegations(struct nfs_client *clp);
31f09607	43	void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
b7391f44	44	void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
d18cc1fd	45	int nfs_client_return_marked_delegations(struct nfs_client *clp);
d3978bb3	46	int nfs_delegations_present(struct nfs_client *clp);
a1d0b5ee	47	void nfs_remove_bad_delegation(struct inode *inode);
1da177e4	48
adfa6f98 DH	49	void nfs_delegation_mark_reclaim(struct nfs_client *clp);
adfa6f98 DH	50	void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
1da177e4 LT	51
1da177e4 LT	52	/* NFSv4 delegation-related procedures */
e6f81075	53	int nfs4_proc_delegreturn(struct inode inode, struct rpc_cred cred, const nfs4_stateid *stateid, int issync);
13437e12	54	int nfs4_open_delegation_recall(struct nfs_open_context ctx, struct nfs4_state state, const nfs4_stateid *stateid);
888e694c	55	int nfs4_lock_delegation_recall(struct nfs4_state state, struct file_lock fl);
0032a7a7	56	bool nfs4_copy_delegation_stateid(nfs4_stateid dst, struct inode inode, fmode_t flags);
1da177e4	57
b7391f44	58	void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
bd7bf9d5	59	int nfs_have_delegation(struct inode *inode, fmode_t flags);
cae7a073	60
1da177e4	61	#else
bd7bf9d5	62	static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
1da177e4 LT	63	{
	64	return 0;
	65	}
cae7a073 TM	66
	67	static inline int nfs_inode_return_delegation(struct inode *inode)
	68	{
c57d1bc5	69	nfs_wb_all(inode);
cae7a073 TM	70	return 0;
cae7a073 TM	71	}
1da177e4 LT	72	#endif
1da177e4 LT	73
b4d2314b TM	74	static inline int nfs_have_delegated_attributes(struct inode *inode)
	75	{
	76	return nfs_have_delegation(inode, FMODE_READ) &&
	77	!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
	78	}
	79
1da177e4	80	#endif