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 int ceph_fscache_register(void);
  30 void ceph_fscache_unregister(void);
  31
  32 int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
  33 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
  34
  35 void ceph_fscache_inode_init(struct ceph_inode_info *ci);
  36 void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
  37                                         struct ceph_inode_info* ci);
  38 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
  39
  40 int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
  41 int ceph_readpages_from_fscache(struct inode *inode,
  42                                 struct address_space *mapping,
  43                                 struct list_head *pages,
  44                                 unsigned *nr_pages);
  45 void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
  46 void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
  47 void ceph_queue_revalidate(struct inode *inode);
  48
  49 static inline void ceph_fscache_invalidate(struct inode *inode)
  50 {
  51         fscache_invalidate(ceph_inode(inode)->fscache);
  52 }
  53
  54 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
  55 {
  56         struct inode* inode = page->mapping->host;
  57         struct ceph_inode_info *ci = ceph_inode(inode);
  58         return fscache_maybe_release_page(ci->fscache, page, gfp);
  59 }
  60
  61 #else
  62
  63 static inline int ceph_fscache_register(void)
  64 {
  65         return 0;
  66 }
  67
  68 static inline void ceph_fscache_unregister(void)
  69 {
  70 }
  71
  72 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
  73 {
  74         return 0;
  75 }
  76
  77 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  78 {
  79 }
  80
  81 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  82 {
  83 }
  84
  85 static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
  86                                                       struct ceph_inode_info* ci)
  87 {
  88 }
  89
  90 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
  91 {
  92 }
  93
  94 static inline int ceph_readpage_from_fscache(struct inode* inode,
  95                                              struct page *page)
  96 {
  97         return -ENOBUFS;
  98 }
  99
 100 static inline int ceph_readpages_from_fscache(struct inode *inode,
 101                                               struct address_space *mapping,
 102                                               struct list_head *pages,
 103                                               unsigned *nr_pages)
 104 {
 105         return -ENOBUFS;
 106 }
 107
 108 static inline void ceph_readpage_to_fscache(struct inode *inode,
 109                                             struct page *page)
 110 {
 111 }
 112
 113 static inline void ceph_fscache_invalidate(struct inode *inode)
 114 {
 115 }
 116
 117 static inline void ceph_invalidate_fscache_page(struct inode *inode,
 118                                                 struct page *page)
 119 {
 120 }
 121
 122 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
 123 {
 124         return 1;
 125 }
 126
 127 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
 128                                                  struct list_head *pages)
 129 {
 130 }
 131
 132 static inline void ceph_queue_revalidate(struct inode *inode)
 133 {
 134 }
 135
 136 #endif
 137
 138 #endif