[deliverable/linux.git] / fs / ceph / cache.h

/*
 * Ceph cache definitions.
 *
 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
 *  Written by Milosz Tanski (milosz@adfin.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#ifndef _CEPH_CACHE_H
#define _CEPH_CACHE_H

#ifdef CONFIG_CEPH_FSCACHE

extern struct fscache_netfs ceph_cache_netfs;

int ceph_fscache_register(void);
void ceph_fscache_unregister(void);

int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);

void ceph_fscache_inode_init(struct ceph_inode_info *ci);
void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
					struct ceph_inode_info* ci);
void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);

int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
int ceph_readpages_from_fscache(struct inode *inode,
				struct address_space *mapping,
				struct list_head *pages,
				unsigned *nr_pages);
void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
void ceph_queue_revalidate(struct inode *inode);

static inline void ceph_fscache_invalidate(struct inode *inode)
{
	fscache_invalidate(ceph_inode(inode)->fscache);
}

static inline void ceph_fscache_uncache_page(struct inode *inode,
					     struct page *page)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	return fscache_uncache_page(ci->fscache, page);
}

static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
{
	struct inode* inode = page->mapping->host;
	struct ceph_inode_info *ci = ceph_inode(inode);
	return fscache_maybe_release_page(ci->fscache, page, gfp);
}

static inline void ceph_fscache_readpages_cancel(struct inode *inode,
						 struct list_head *pages)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	return fscache_readpages_cancel(ci->fscache, pages);
}

#else

static inline int ceph_fscache_register(void)
{
	return 0;
}

static inline void ceph_fscache_unregister(void)
{
}

static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
{
	return 0;
}

static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
}

static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
{
}

static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
						      struct ceph_inode_info* ci)
{
}

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

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

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

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

static inline void ceph_fscache_invalidate(struct inode *inode)
{
}

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

static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
{
}

static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
{
	return 1;
}

static inline void ceph_fscache_readpages_cancel(struct inode *inode,
						 struct list_head *pages)
{
}

static inline void ceph_queue_revalidate(struct inode *inode)
{
}

#endif

#endif
Commit	Line	Data
99ccbd22 MT	1	/*
	2	* Ceph cache definitions.
	3	*
	4	* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
	5	* Written by Milosz Tanski (milosz@adfin.com)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2
	9	* as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to:
	18	* Free Software Foundation
	19	* 51 Franklin Street, Fifth Floor
	20	* Boston, MA 02111-1301 USA
	21	*
	22	*/
	23
	24	#ifndef _CEPH_CACHE_H
	25	#define _CEPH_CACHE_H
	26
	27	#ifdef CONFIG_CEPH_FSCACHE
	28
971f0bde MT	29	extern struct fscache_netfs ceph_cache_netfs;
971f0bde MT	30
99ccbd22 MT	31	int ceph_fscache_register(void);
	32	void ceph_fscache_unregister(void);
	33
	34	int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
	35	void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
	36
	37	void ceph_fscache_inode_init(struct ceph_inode_info *ci);
	38	void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
	39	struct ceph_inode_info* ci);
	40	void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
	41
	42	int ceph_readpage_from_fscache(struct inode inode, struct page page);
	43	int ceph_readpages_from_fscache(struct inode *inode,
	44	struct address_space *mapping,
	45	struct list_head *pages,
	46	unsigned *nr_pages);
	47	void ceph_readpage_to_fscache(struct inode inode, struct page page);
	48	void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
	49	void ceph_queue_revalidate(struct inode *inode);
	50
	51	static inline void ceph_fscache_invalidate(struct inode *inode)
	52	{
	53	fscache_invalidate(ceph_inode(inode)->fscache);
	54	}
	55
d4d3aa38 MT	56	static inline void ceph_fscache_uncache_page(struct inode *inode,
	57	struct page *page)
	58	{
	59	struct ceph_inode_info *ci = ceph_inode(inode);
	60	return fscache_uncache_page(ci->fscache, page);
	61	}
	62
99ccbd22 MT	63	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	64	{
	65	struct inode* inode = page->mapping->host;
	66	struct ceph_inode_info *ci = ceph_inode(inode);
	67	return fscache_maybe_release_page(ci->fscache, page, gfp);
	68	}
	69
76be778b MT	70	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	71	struct list_head *pages)
	72	{
	73	struct ceph_inode_info *ci = ceph_inode(inode);
	74	return fscache_readpages_cancel(ci->fscache, pages);
	75	}
	76
99ccbd22 MT	77	#else
	78
	79	static inline int ceph_fscache_register(void)
	80	{
	81	return 0;
	82	}
	83
	84	static inline void ceph_fscache_unregister(void)
	85	{
	86	}
	87
	88	static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
	89	{
	90	return 0;
	91	}
	92
	93	static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
	94	{
	95	}
	96
	97	static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	98	{
	99	}
	100
	101	static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
	102	struct ceph_inode_info* ci)
	103	{
	104	}
	105
d4d3aa38 MT	106	static inline void ceph_fscache_uncache_page(struct inode *inode,
d4d3aa38 MT	107	struct page *pages)
99ccbd22 MT	108	{
	109	}
	110
	111	static inline int ceph_readpage_from_fscache(struct inode* inode,
	112	struct page *page)
	113	{
	114	return -ENOBUFS;
	115	}
	116
	117	static inline int ceph_readpages_from_fscache(struct inode *inode,
	118	struct address_space *mapping,
	119	struct list_head *pages,
	120	unsigned *nr_pages)
	121	{
	122	return -ENOBUFS;
	123	}
	124
	125	static inline void ceph_readpage_to_fscache(struct inode *inode,
	126	struct page *page)
	127	{
	128	}
	129
	130	static inline void ceph_fscache_invalidate(struct inode *inode)
	131	{
	132	}
	133
	134	static inline void ceph_invalidate_fscache_page(struct inode *inode,
	135	struct page *page)
	136	{
	137	}
	138
d4d3aa38 MT	139	static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
	140	{
	141	}
	142
99ccbd22 MT	143	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	144	{
	145	return 1;
	146	}
	147
	148	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	149	struct list_head *pages)
	150	{
	151	}
	152
	153	static inline void ceph_queue_revalidate(struct inode *inode)
	154	{
	155	}
	156
	157	#endif
	158
	159	#endif