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