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

/*
 * Ceph cache definitions.
 *
 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
 *  Written by Milosz Tanski ([email protected])
 *
 *  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_register_inode_cookie(struct inode *inode);
void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
void ceph_fscache_revalidate_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);

static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
{
	ci->fscache = NULL;
	ci->i_fscache_gen = 0;
}

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);
}

static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
{
	ci->i_fscache_gen = ci->i_rdcache_gen - 1;
}

#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 inode *inode)
{
}

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

static inline void ceph_fscache_file_set_cookie(struct inode *inode,
						struct file *filp)
{
}

static inline void ceph_fscache_revalidate_cookie(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 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_disable_fscache_readpage(struct ceph_inode_info *ci)
{
}

#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 ([email protected])
	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
46b59b2b	37	void ceph_fscache_register_inode_cookie(struct inode *inode);
99ccbd22	38	void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
46b59b2b	39	void ceph_fscache_file_set_cookie(struct inode inode, struct file filp);
f7f7e7a0	40	void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
99ccbd22 MT	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);
f7f7e7a0 YZ	49
	50	static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	51	{
	52	ci->fscache = NULL;
	53	ci->i_fscache_gen = 0;
	54	}
99ccbd22 MT	55
	56	static inline void ceph_fscache_invalidate(struct inode *inode)
	57	{
	58	fscache_invalidate(ceph_inode(inode)->fscache);
	59	}
	60
d4d3aa38 MT	61	static inline void ceph_fscache_uncache_page(struct inode *inode,
	62	struct page *page)
	63	{
	64	struct ceph_inode_info *ci = ceph_inode(inode);
	65	return fscache_uncache_page(ci->fscache, page);
	66	}
	67
99ccbd22 MT	68	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	69	{
	70	struct inode* inode = page->mapping->host;
	71	struct ceph_inode_info *ci = ceph_inode(inode);
	72	return fscache_maybe_release_page(ci->fscache, page, gfp);
	73	}
	74
3f42bc4b LW	75	static inline void ceph_fscache_readpage_cancel(struct inode *inode,
	76	struct page *page)
	77	{
	78	struct ceph_inode_info *ci = ceph_inode(inode);
	79	if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
	80	__fscache_uncache_page(ci->fscache, page);
	81	}
	82
76be778b MT	83	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	84	struct list_head *pages)
	85	{
	86	struct ceph_inode_info *ci = ceph_inode(inode);
	87	return fscache_readpages_cancel(ci->fscache, pages);
	88	}
	89
f7f7e7a0 YZ	90	static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
	91	{
	92	ci->i_fscache_gen = ci->i_rdcache_gen - 1;
	93	}
	94
99ccbd22 MT	95	#else
	96
	97	static inline int ceph_fscache_register(void)
	98	{
	99	return 0;
	100	}
	101
	102	static inline void ceph_fscache_unregister(void)
	103	{
	104	}
	105
	106	static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
	107	{
	108	return 0;
	109	}
	110
	111	static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
	112	{
	113	}
	114
	115	static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	116	{
	117	}
	118
46b59b2b YZ	119	static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
	120	{
	121	}
	122
	123	static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
	124	{
	125	}
	126
	127	static inline void ceph_fscache_file_set_cookie(struct inode *inode,
	128	struct file *filp)
99ccbd22 MT	129	{
	130	}
	131
f7f7e7a0 YZ	132	static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
	133	{
	134	}
	135
d4d3aa38 MT	136	static inline void ceph_fscache_uncache_page(struct inode *inode,
d4d3aa38 MT	137	struct page *pages)
99ccbd22 MT	138	{
	139	}
	140
	141	static inline int ceph_readpage_from_fscache(struct inode* inode,
	142	struct page *page)
	143	{
	144	return -ENOBUFS;
	145	}
	146
	147	static inline int ceph_readpages_from_fscache(struct inode *inode,
	148	struct address_space *mapping,
	149	struct list_head *pages,
	150	unsigned *nr_pages)
	151	{
	152	return -ENOBUFS;
	153	}
	154
	155	static inline void ceph_readpage_to_fscache(struct inode *inode,
	156	struct page *page)
	157	{
	158	}
	159
	160	static inline void ceph_fscache_invalidate(struct inode *inode)
	161	{
	162	}
	163
	164	static inline void ceph_invalidate_fscache_page(struct inode *inode,
	165	struct page *page)
	166	{
	167	}
	168
	169	static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
	170	{
	171	return 1;
	172	}
	173
3f42bc4b LW	174	static inline void ceph_fscache_readpage_cancel(struct inode *inode,
	175	struct page *page)
	176	{
	177	}
	178
99ccbd22 MT	179	static inline void ceph_fscache_readpages_cancel(struct inode *inode,
	180	struct list_head *pages)
	181	{
	182	}
	183
f7f7e7a0	184	static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
99ccbd22 MT	185	{
	186	}
	187
	188	#endif
	189
	190	#endif