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
 29extern struct fscache_netfs ceph_cache_netfs;
 30
 31int ceph_fscache_register(void);
 32void ceph_fscache_unregister(void);
 33
 34int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
 35void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
 36
 37void ceph_fscache_inode_init(struct ceph_inode_info *ci);
 38void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
 39					struct ceph_inode_info* ci);
 40void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
 41
 42int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
 43int ceph_readpages_from_fscache(struct inode *inode,
 44				struct address_space *mapping,
 45				struct list_head *pages,
 46				unsigned *nr_pages);
 47void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
 48void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
 49void ceph_queue_revalidate(struct inode *inode);
 50
 51static 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
 57static inline void ceph_fscache_invalidate(struct inode *inode)
 58{
 59	fscache_invalidate(ceph_inode(inode)->fscache);
 60}
 61
 62static 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
 69static 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
 76static 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
 84static 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
 91#else
 92
 93static inline int ceph_fscache_register(void)
 94{
 95	return 0;
 96}
 97
 98static inline void ceph_fscache_unregister(void)
 99{
100}
101
102static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
103{
104	return 0;
105}
106
107static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
108{
109}
110
111static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
112{
113}
114
115static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
116						      struct ceph_inode_info* ci)
117{
118}
119
120static inline void ceph_fscache_uncache_page(struct inode *inode,
121					     struct page *pages)
122{
123}
124
125static inline int ceph_readpage_from_fscache(struct inode* inode,
126					     struct page *page)
127{
128	return -ENOBUFS;
129}
130
131static 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
139static inline void ceph_readpage_to_fscache(struct inode *inode,
140					    struct page *page)
141{
142}
143
144static inline void ceph_fscache_update_objectsize(struct inode *inode)
145{
146}
147
148static inline void ceph_fscache_invalidate(struct inode *inode)
149{
150}
151
152static inline void ceph_invalidate_fscache_page(struct inode *inode,
153						struct page *page)
154{
155}
156
157static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
158{
159}
160
161static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
162{
163	return 1;
164}
165
166static inline void ceph_fscache_readpage_cancel(struct inode *inode,
167						struct page *page)
168{
169}
170
171static inline void ceph_fscache_readpages_cancel(struct inode *inode,
172						 struct list_head *pages)
173{
174}
175
176static inline void ceph_queue_revalidate(struct inode *inode)
177{
178}
179
180#endif
181
182#endif