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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | /* * V9FS cache definitions. * * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu> * * 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 _9P_CACHE_H #ifdef CONFIG_9P_FSCACHE #include <linux/fscache.h> #include <linux/spinlock.h> extern struct kmem_cache *vcookie_cache; struct v9fs_cookie { spinlock_t lock; struct inode inode; struct fscache_cookie *fscache; struct p9_qid *qid; }; static inline struct v9fs_cookie *v9fs_inode2cookie(const struct inode *inode) { return container_of(inode, struct v9fs_cookie, inode); } extern struct fscache_netfs v9fs_cache_netfs; extern const struct fscache_cookie_def v9fs_cache_session_index_def; extern const struct fscache_cookie_def v9fs_cache_inode_index_def; extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses); extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses); extern void v9fs_cache_inode_get_cookie(struct inode *inode); extern void v9fs_cache_inode_put_cookie(struct inode *inode); extern void v9fs_cache_inode_flush_cookie(struct inode *inode); extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp); extern void v9fs_cache_inode_reset_cookie(struct inode *inode); extern int __v9fs_cache_register(void); extern void __v9fs_cache_unregister(void); extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp); extern void __v9fs_fscache_invalidate_page(struct page *page); extern int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page); extern int __v9fs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages); extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page); /** * v9fs_cache_register - Register v9fs file system with the cache */ static inline int v9fs_cache_register(void) { return __v9fs_cache_register(); } /** * v9fs_cache_unregister - Unregister v9fs from the cache */ static inline void v9fs_cache_unregister(void) { __v9fs_cache_unregister(); } static inline int v9fs_fscache_release_page(struct page *page, gfp_t gfp) { return __v9fs_fscache_release_page(page, gfp); } static inline void v9fs_fscache_invalidate_page(struct page *page) { __v9fs_fscache_invalidate_page(page); } static inline int v9fs_readpage_from_fscache(struct inode *inode, struct page *page) { return __v9fs_readpage_from_fscache(inode, page); } static inline int v9fs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { return __v9fs_readpages_from_fscache(inode, mapping, pages, nr_pages); } static inline void v9fs_readpage_to_fscache(struct inode *inode, struct page *page) { if (PageFsCache(page)) __v9fs_readpage_to_fscache(inode, page); } static inline void v9fs_uncache_page(struct inode *inode, struct page *page) { struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode); fscache_uncache_page(vcookie->fscache, page); BUG_ON(PageFsCache(page)); } static inline void v9fs_vcookie_set_qid(struct inode *inode, struct p9_qid *qid) { struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode); spin_lock(&vcookie->lock); vcookie->qid = qid; spin_unlock(&vcookie->lock); } #else /* CONFIG_9P_FSCACHE */ static inline int v9fs_cache_register(void) { return 1; } static inline void v9fs_cache_unregister(void) {} static inline int v9fs_fscache_release_page(struct page *page, gfp_t gfp) { return 1; } static inline void v9fs_fscache_invalidate_page(struct page *page) {} static inline int v9fs_readpage_from_fscache(struct inode *inode, struct page *page) { return -ENOBUFS; } static inline int v9fs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { return -ENOBUFS; } static inline void v9fs_readpage_to_fscache(struct inode *inode, struct page *page) {} static inline void v9fs_uncache_page(struct inode *inode, struct page *page) {} static inline void v9fs_vcookie_set_qid(struct inode *inode, struct p9_qid *qid) {} #endif /* CONFIG_9P_FSCACHE */ #endif /* _9P_CACHE_H */ |