[linux-2.6-block.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_update_objectsize(struct inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	fscache_attr_changed(ci->fscache);
}

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_readpage_cancel(struct inode *inode,
						struct page *page)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
		__fscache_uncache_page(ci->fscache, page);
}

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_update_objectsize(struct inode *inode)
{
}

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_readpage_cancel(struct inode *inode,
						struct page *page)
{
}

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
020c4bdd YW	51	static inline void ceph_fscache_update_objectsize(struct inode *inode)
	52	{
	53	struct ceph_inode_info *ci = ceph_inode(inode);
	54	fscache_attr_changed(ci->fscache);
	55	}
	56
99ccbd22 MT	57	static inline void ceph_fscache_invalidate(struct inode *inode)
	58	{
	59	fscache_invalidate(ceph_inode(inode)->fscache);
	60	}
	61
d4d3aa38 MT	62	static inline void ceph_fscache_uncache_page(struct inode *inode,
	63	struct page *page)
	64	{
	65	struct ceph_inode_info *ci = ceph_inode(inode);
	66	return fscache_uncache_page(ci->fscache, page);
	67	}
	68
99ccbd22 MT	69	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	70	{
	71	struct inode* inode = page->mapping->host;
	72	struct ceph_inode_info *ci = ceph_inode(inode);
	73	return fscache_maybe_release_page(ci->fscache, page, gfp);
	74	}
	75
3f42bc4b LW	76	static inline void ceph_fscache_readpage_cancel(struct inode *inode,
	77	struct page *page)
	78	{
	79	struct ceph_inode_info *ci = ceph_inode(inode);
	80	if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
	81	__fscache_uncache_page(ci->fscache, page);
	82	}
	83
76be778b MT	84	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	85	struct list_head *pages)
	86	{
	87	struct ceph_inode_info *ci = ceph_inode(inode);
	88	return fscache_readpages_cancel(ci->fscache, pages);
	89	}
	90
99ccbd22 MT	91	#else
	92
	93	static inline int ceph_fscache_register(void)
	94	{
	95	return 0;
	96	}
	97
	98	static inline void ceph_fscache_unregister(void)
	99	{
	100	}
	101
	102	static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
	103	{
	104	return 0;
	105	}
	106
	107	static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
	108	{
	109	}
	110
	111	static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	112	{
	113	}
	114
	115	static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
	116	struct ceph_inode_info* ci)
	117	{
	118	}
	119
d4d3aa38 MT	120	static inline void ceph_fscache_uncache_page(struct inode *inode,
d4d3aa38 MT	121	struct page *pages)
99ccbd22 MT	122	{
	123	}
	124
	125	static inline int ceph_readpage_from_fscache(struct inode* inode,
	126	struct page *page)
	127	{
	128	return -ENOBUFS;
	129	}
	130
	131	static inline int ceph_readpages_from_fscache(struct inode *inode,
	132	struct address_space *mapping,
	133	struct list_head *pages,
	134	unsigned *nr_pages)
	135	{
	136	return -ENOBUFS;
	137	}
	138
	139	static inline void ceph_readpage_to_fscache(struct inode *inode,
	140	struct page *page)
	141	{
	142	}
	143
020c4bdd YW	144	static inline void ceph_fscache_update_objectsize(struct inode *inode)
	145	{
	146	}
	147
99ccbd22 MT	148	static inline void ceph_fscache_invalidate(struct inode *inode)
	149	{
	150	}
	151
	152	static inline void ceph_invalidate_fscache_page(struct inode *inode,
	153	struct page *page)
	154	{
	155	}
	156
d4d3aa38 MT	157	static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
	158	{
	159	}
	160
99ccbd22 MT	161	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	162	{
	163	return 1;
	164	}
	165
3f42bc4b LW	166	static inline void ceph_fscache_readpage_cancel(struct inode *inode,
	167	struct page *page)
	168	{
	169	}
	170
99ccbd22 MT	171	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	172	struct list_head *pages)
	173	{
	174	}
	175
	176	static inline void ceph_queue_revalidate(struct inode *inode)
	177	{
	178	}
	179
	180	#endif
	181
	182	#endif