[net-next-2.6.git] / fs / cifs / fscache.h

/*
 *   fs/cifs/fscache.h - CIFS filesystem cache interface definitions
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _CIFS_FSCACHE_H
#define _CIFS_FSCACHE_H

#include <linux/fscache.h>

#include "cifsglob.h"

#ifdef CONFIG_CIFS_FSCACHE

extern struct fscache_netfs cifs_fscache_netfs;
extern const struct fscache_cookie_def cifs_fscache_server_index_def;
extern const struct fscache_cookie_def cifs_fscache_super_index_def;
extern const struct fscache_cookie_def cifs_fscache_inode_object_def;

extern int cifs_fscache_register(void);
extern void cifs_fscache_unregister(void);

/*
 * fscache.c
 */
extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
extern void cifs_fscache_get_super_cookie(struct cifsTconInfo *);
extern void cifs_fscache_release_super_cookie(struct cifsTconInfo *);

extern void cifs_fscache_release_inode_cookie(struct inode *);
extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
extern void cifs_fscache_reset_inode_cookie(struct inode *);

extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
extern int __cifs_readpages_from_fscache(struct inode *,
					 struct address_space *,
					 struct list_head *,
					 unsigned *);

extern void __cifs_readpage_to_fscache(struct inode *, struct page *);

static inline void cifs_fscache_invalidate_page(struct page *page,
					       struct inode *inode)
{
	if (PageFsCache(page))
		__cifs_fscache_invalidate_page(page, inode);
}

static inline int cifs_readpage_from_fscache(struct inode *inode,
					     struct page *page)
{
	if (CIFS_I(inode)->fscache)
		return __cifs_readpage_from_fscache(inode, page);

	return -ENOBUFS;
}

static inline int cifs_readpages_from_fscache(struct inode *inode,
					      struct address_space *mapping,
					      struct list_head *pages,
					      unsigned *nr_pages)
{
	if (CIFS_I(inode)->fscache)
		return __cifs_readpages_from_fscache(inode, mapping, pages,
						     nr_pages);
	return -ENOBUFS;
}

static inline void cifs_readpage_to_fscache(struct inode *inode,
					    struct page *page)
{
	if (PageFsCache(page))
		__cifs_readpage_to_fscache(inode, page);
}

#else /* CONFIG_CIFS_FSCACHE */
static inline int cifs_fscache_register(void) { return 0; }
static inline void cifs_fscache_unregister(void) {}

static inline void
cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
static inline void
cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
static inline void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon) {}
static inline void
cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon) {}

static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
						 struct file *filp) {}
static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
{
	return 1; /* May release page */
}

static inline void cifs_fscache_invalidate_page(struct page *page,
			struct inode *inode) {}
static inline int
cifs_readpage_from_fscache(struct inode *inode, struct page *page)
{
	return -ENOBUFS;
}

static inline int cifs_readpages_from_fscache(struct inode *inode,
					      struct address_space *mapping,
					      struct list_head *pages,
					      unsigned *nr_pages)
{
	return -ENOBUFS;
}

static inline void cifs_readpage_to_fscache(struct inode *inode,
			struct page *page) {}

#endif /* CONFIG_CIFS_FSCACHE */

#endif /* _CIFS_FSCACHE_H */
Commit	Line	Data
f579cf3c SJ	1	/*
	2	* fs/cifs/fscache.h - CIFS filesystem cache interface definitions
	3	*
	4	* Copyright (c) 2010 Novell, Inc.
	5	* Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21	#ifndef _CIFS_FSCACHE_H
	22	#define _CIFS_FSCACHE_H
	23
	24	#include <linux/fscache.h>
	25
488f1d2d SJ	26	#include "cifsglob.h"
488f1d2d SJ	27
f579cf3c SJ	28	#ifdef CONFIG_CIFS_FSCACHE
	29
	30	extern struct fscache_netfs cifs_fscache_netfs;
488f1d2d	31	extern const struct fscache_cookie_def cifs_fscache_server_index_def;
d03382ce	32	extern const struct fscache_cookie_def cifs_fscache_super_index_def;
9451a9a5 SJ	33	extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
9451a9a5 SJ	34
f579cf3c SJ	35	extern int cifs_fscache_register(void);
	36	extern void cifs_fscache_unregister(void);
	37
488f1d2d SJ	38	/*
	39	* fscache.c
	40	*/
	41	extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
	42	extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
d03382ce SJ	43	extern void cifs_fscache_get_super_cookie(struct cifsTconInfo *);
d03382ce SJ	44	extern void cifs_fscache_release_super_cookie(struct cifsTconInfo *);
488f1d2d	45
9451a9a5 SJ	46	extern void cifs_fscache_release_inode_cookie(struct inode *);
	47	extern void cifs_fscache_set_inode_cookie(struct inode , struct file );
	48	extern void cifs_fscache_reset_inode_cookie(struct inode *);
	49
85f2d6b4 SJ	50	extern void __cifs_fscache_invalidate_page(struct page , struct inode );
85f2d6b4 SJ	51	extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
56698236 SJ	52	extern int __cifs_readpage_from_fscache(struct inode , struct page );
	53	extern int __cifs_readpages_from_fscache(struct inode *,
	54	struct address_space *,
	55	struct list_head *,
	56	unsigned *);
85f2d6b4	57
9dc06558 SJ	58	extern void __cifs_readpage_to_fscache(struct inode , struct page );
9dc06558 SJ	59
85f2d6b4 SJ	60	static inline void cifs_fscache_invalidate_page(struct page *page,
	61	struct inode *inode)
	62	{
	63	if (PageFsCache(page))
	64	__cifs_fscache_invalidate_page(page, inode);
	65	}
	66
56698236 SJ	67	static inline int cifs_readpage_from_fscache(struct inode *inode,
	68	struct page *page)
	69	{
	70	if (CIFS_I(inode)->fscache)
	71	return __cifs_readpage_from_fscache(inode, page);
	72
	73	return -ENOBUFS;
	74	}
	75
	76	static inline int cifs_readpages_from_fscache(struct inode *inode,
	77	struct address_space *mapping,
	78	struct list_head *pages,
	79	unsigned *nr_pages)
	80	{
	81	if (CIFS_I(inode)->fscache)
	82	return __cifs_readpages_from_fscache(inode, mapping, pages,
	83	nr_pages);
	84	return -ENOBUFS;
	85	}
	86
9dc06558 SJ	87	static inline void cifs_readpage_to_fscache(struct inode *inode,
	88	struct page *page)
	89	{
	90	if (PageFsCache(page))
	91	__cifs_readpage_to_fscache(inode, page);
	92	}
	93
f579cf3c SJ	94	#else /* CONFIG_CIFS_FSCACHE */
	95	static inline int cifs_fscache_register(void) { return 0; }
	96	static inline void cifs_fscache_unregister(void) {}
	97
488f1d2d SJ	98	static inline void
	99	cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
	100	static inline void
c5e04a3e	101	cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
d03382ce SJ	102	static inline void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon) {}
	103	static inline void
	104	cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon) {}
488f1d2d	105
9451a9a5 SJ	106	static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
	107	static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
	108	struct file *filp) {}
	109	static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
d0e6f44e	110	static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
85f2d6b4 SJ	111	{
	112	return 1; /* May release page */
	113	}
9451a9a5	114
d0e6f44e SF	115	static inline void cifs_fscache_invalidate_page(struct page *page,
d0e6f44e SF	116	struct inode *inode) {}
56698236 SJ	117	static inline int
	118	cifs_readpage_from_fscache(struct inode inode, struct page page)
	119	{
	120	return -ENOBUFS;
	121	}
	122
	123	static inline int cifs_readpages_from_fscache(struct inode *inode,
	124	struct address_space *mapping,
	125	struct list_head *pages,
	126	unsigned *nr_pages)
	127	{
	128	return -ENOBUFS;
	129	}
	130
9dc06558 SJ	131	static inline void cifs_readpage_to_fscache(struct inode *inode,
9dc06558 SJ	132	struct page *page) {}
9451a9a5	133
f579cf3c SJ	134	#endif /* CONFIG_CIFS_FSCACHE */
	135
	136	#endif /* _CIFS_FSCACHE_H */