1/* 2 * V9FS cache definitions. 3 * 4 * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to: 17 * Free Software Foundation 18 * 51 Franklin Street, Fifth Floor 19 * Boston, MA 02111-1301 USA 20 * 21 */ 22 23#ifndef _9P_CACHE_H 24#define _9P_CACHE_H 25#ifdef CONFIG_9P_FSCACHE 26#include <linux/fscache.h> 27#include <linux/spinlock.h> 28 29extern struct fscache_netfs v9fs_cache_netfs; 30extern const struct fscache_cookie_def v9fs_cache_session_index_def; 31extern const struct fscache_cookie_def v9fs_cache_inode_index_def; 32 33extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses); 34extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses); 35 36extern void v9fs_cache_inode_get_cookie(struct inode *inode); 37extern void v9fs_cache_inode_put_cookie(struct inode *inode); 38extern void v9fs_cache_inode_flush_cookie(struct inode *inode); 39extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp); 40extern void v9fs_cache_inode_reset_cookie(struct inode *inode); 41 42extern int __v9fs_cache_register(void); 43extern void __v9fs_cache_unregister(void); 44 45extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp); 46extern void __v9fs_fscache_invalidate_page(struct page *page); 47extern int __v9fs_readpage_from_fscache(struct inode *inode, 48 struct page *page); 49extern int __v9fs_readpages_from_fscache(struct inode *inode, 50 struct address_space *mapping, 51 struct list_head *pages, 52 unsigned *nr_pages); 53extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page); 54extern void __v9fs_fscache_wait_on_page_write(struct inode *inode, 55 struct page *page); 56 57static inline int v9fs_fscache_release_page(struct page *page, 58 gfp_t gfp) 59{ 60 return __v9fs_fscache_release_page(page, gfp); 61} 62 63static inline void v9fs_fscache_invalidate_page(struct page *page) 64{ 65 __v9fs_fscache_invalidate_page(page); 66} 67 68static inline int v9fs_readpage_from_fscache(struct inode *inode, 69 struct page *page) 70{ 71 return __v9fs_readpage_from_fscache(inode, page); 72} 73 74static inline int v9fs_readpages_from_fscache(struct inode *inode, 75 struct address_space *mapping, 76 struct list_head *pages, 77 unsigned *nr_pages) 78{ 79 return __v9fs_readpages_from_fscache(inode, mapping, pages, 80 nr_pages); 81} 82 83static inline void v9fs_readpage_to_fscache(struct inode *inode, 84 struct page *page) 85{ 86 if (PageFsCache(page)) 87 __v9fs_readpage_to_fscache(inode, page); 88} 89 90static inline void v9fs_uncache_page(struct inode *inode, struct page *page) 91{ 92 struct v9fs_inode *v9inode = V9FS_I(inode); 93 fscache_uncache_page(v9inode->fscache, page); 94 BUG_ON(PageFsCache(page)); 95} 96 97static inline void v9fs_fscache_wait_on_page_write(struct inode *inode, 98 struct page *page) 99{ 100 return __v9fs_fscache_wait_on_page_write(inode, page); 101} 102 103#else /* CONFIG_9P_FSCACHE */ 104 105static inline void v9fs_cache_inode_get_cookie(struct inode *inode) 106{ 107} 108 109static inline void v9fs_cache_inode_put_cookie(struct inode *inode) 110{ 111} 112 113static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file) 114{ 115} 116 117static inline int v9fs_fscache_release_page(struct page *page, 118 gfp_t gfp) { 119 return 1; 120} 121 122static inline void v9fs_fscache_invalidate_page(struct page *page) {} 123 124static inline int v9fs_readpage_from_fscache(struct inode *inode, 125 struct page *page) 126{ 127 return -ENOBUFS; 128} 129 130static inline int v9fs_readpages_from_fscache(struct inode *inode, 131 struct address_space *mapping, 132 struct list_head *pages, 133 unsigned *nr_pages) 134{ 135 return -ENOBUFS; 136} 137 138static inline void v9fs_readpage_to_fscache(struct inode *inode, 139 struct page *page) 140{} 141 142static inline void v9fs_uncache_page(struct inode *inode, struct page *page) 143{} 144 145static inline void v9fs_fscache_wait_on_page_write(struct inode *inode, 146 struct page *page) 147{ 148 return; 149} 150 151#endif /* CONFIG_9P_FSCACHE */ 152#endif /* _9P_CACHE_H */ 153