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_readpages_cancel(struct inode *inode,
  71                                                  struct list_head *pages)
  72 {
  73         struct ceph_inode_info *ci = ceph_inode(inode);
  74         return fscache_readpages_cancel(ci->fscache, pages);
  75 }
  76
  77 #else
  78
  79 static inline int ceph_fscache_register(void)
  80 {
  81         return 0;
  82 }
  83
  84 static inline void ceph_fscache_unregister(void)
  85 {
  86 }
  87
  88 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
  89 {
  90         return 0;
  91 }
  92
  93 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  94 {
  95 }
  96
  97 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  98 {
  99 }
 100
 101 static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
 102                                                       struct ceph_inode_info* ci)
 103 {
 104 }
 105
 106 static inline void ceph_fscache_uncache_page(struct inode *inode,
 107                                              struct page *pages)
 108 {
 109 }
 110
 111 static inline int ceph_readpage_from_fscache(struct inode* inode,
 112                                              struct page *page)
 113 {
 114         return -ENOBUFS;
 115 }
 116
 117 static inline int ceph_readpages_from_fscache(struct inode *inode,
 118                                               struct address_space *mapping,
 119                                               struct list_head *pages,
 120                                               unsigned *nr_pages)
 121 {
 122         return -ENOBUFS;
 123 }
 124
 125 static inline void ceph_readpage_to_fscache(struct inode *inode,
 126                                             struct page *page)
 127 {
 128 }
 129
 130 static inline void ceph_fscache_invalidate(struct inode *inode)
 131 {
 132 }
 133
 134 static inline void ceph_invalidate_fscache_page(struct inode *inode,
 135                                                 struct page *page)
 136 {
 137 }
 138
 139 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
 140 {
 141 }
 142
 143 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
 144 {
 145         return 1;
 146 }
 147
 148 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
 149                                                  struct list_head *pages)
 150 {
 151 }
 152
 153 static inline void ceph_queue_revalidate(struct inode *inode)
 154 {
 155 }
 156
 157 #endif
 158
 159 #endif