fs/ceph/cache.h

   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