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_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_update_objectsize(struct inode *inode) 52 { 53 struct ceph_inode_info *ci = ceph_inode(inode); 54 fscache_attr_changed(ci->fscache); 55 } 56 57 static inline void ceph_fscache_invalidate(struct inode *inode) 58 { 59 fscache_invalidate(ceph_inode(inode)->fscache); 60 } 61 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 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 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 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 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 } 119 120 static inline void ceph_fscache_uncache_page(struct inode *inode, 121 struct page *pages) 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 } 143 144 static inline void ceph_fscache_update_objectsize(struct inode *inode) 145 { 146 } 147 148 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 } 156 157 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) 158 { 159 } 160 161 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) 162 { 163 return 1; 164 } 165 166 static inline void ceph_fscache_readpage_cancel(struct inode *inode, 167 struct page *page) 168 { 169 } 170 171 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 183