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 29 extern struct fscache_netfs ceph_cache_netfs; 30 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_register_inode_cookie(struct inode *inode); 38 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci); 39 void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp); 40 void ceph_fscache_revalidate_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 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 } 55 56 static inline void ceph_fscache_invalidate(struct inode *inode) 57 { 58 fscache_invalidate(ceph_inode(inode)->fscache); 59 } 60 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 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 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 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 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 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 } 118 119 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) 129 { 130 } 131 132 static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci) 133 { 134 } 135 136 static inline void ceph_fscache_uncache_page(struct inode *inode, 137 struct page *pages) 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 } 173 174 static inline void ceph_fscache_readpage_cancel(struct inode *inode, 175 struct page *page) 176 { 177 } 178 179 static inline void ceph_fscache_readpages_cancel(struct inode *inode, 180 struct list_head *pages) 181 { 182 } 183 184 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci) 185 { 186 } 187 188 #endif 189 190 #endif 191