fs/ceph/cache.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Ceph cache definitions.
   4  *
   5  *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
   6  *  Written by Milosz Tanski (milosz@adfin.com)
   7  */
   8
   9 #ifndef _CEPH_CACHE_H
  10 #define _CEPH_CACHE_H
  11
  12 #ifdef CONFIG_CEPH_FSCACHE
  13
  14 extern struct fscache_netfs ceph_cache_netfs;
  15
  16 int ceph_fscache_register(void);
  17 void ceph_fscache_unregister(void);
  18
  19 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
  20 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
  21
  22 void ceph_fscache_register_inode_cookie(struct inode *inode);
  23 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
  24 void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
  25 void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
  26
  27 int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
  28 int ceph_readpages_from_fscache(struct inode *inode,
  29                                 struct address_space *mapping,
  30                                 struct list_head *pages,
  31                                 unsigned *nr_pages);
  32 void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
  33 void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
  34
  35 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  36 {
  37         ci->fscache = NULL;
  38         ci->i_fscache_gen = 0;
  39 }
  40
  41 static inline void ceph_fscache_invalidate(struct inode *inode)
  42 {
  43         fscache_invalidate(ceph_inode(inode)->fscache);
  44 }
  45
  46 static inline void ceph_fscache_uncache_page(struct inode *inode,
  47                                              struct page *page)
  48 {
  49         struct ceph_inode_info *ci = ceph_inode(inode);
  50         return fscache_uncache_page(ci->fscache, page);
  51 }
  52
  53 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
  54 {
  55         struct inode* inode = page->mapping->host;
  56         struct ceph_inode_info *ci = ceph_inode(inode);
  57         return fscache_maybe_release_page(ci->fscache, page, gfp);
  58 }
  59
  60 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
  61                                                 struct page *page)
  62 {
  63         struct ceph_inode_info *ci = ceph_inode(inode);
  64         if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
  65                 __fscache_uncache_page(ci->fscache, page);
  66 }
  67
  68 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
  69                                                  struct list_head *pages)
  70 {
  71         struct ceph_inode_info *ci = ceph_inode(inode);
  72         return fscache_readpages_cancel(ci->fscache, pages);
  73 }
  74
  75 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
  76 {
  77         ci->i_fscache_gen = ci->i_rdcache_gen - 1;
  78 }
  79
  80 #else
  81
  82 static inline int ceph_fscache_register(void)
  83 {
  84         return 0;
  85 }
  86
  87 static inline void ceph_fscache_unregister(void)
  88 {
  89 }
  90
  91 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
  92                                            struct fs_context *fc)
  93 {
  94         return 0;
  95 }
  96
  97 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  98 {
  99 }
 100
 101 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
 102 {
 103 }
 104
 105 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
 106 {
 107 }
 108
 109 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
 110 {
 111 }
 112
 113 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
 114                                                 struct file *filp)
 115 {
 116 }
 117
 118 static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
 119 {
 120 }
 121
 122 static inline void ceph_fscache_uncache_page(struct inode *inode,
 123                                              struct page *pages)
 124 {
 125 }
 126
 127 static inline int ceph_readpage_from_fscache(struct inode* inode,
 128                                              struct page *page)
 129 {
 130         return -ENOBUFS;
 131 }
 132
 133 static inline int ceph_readpages_from_fscache(struct inode *inode,
 134                                               struct address_space *mapping,
 135                                               struct list_head *pages,
 136                                               unsigned *nr_pages)
 137 {
 138         return -ENOBUFS;
 139 }
 140
 141 static inline void ceph_readpage_to_fscache(struct inode *inode,
 142                                             struct page *page)
 143 {
 144 }
 145
 146 static inline void ceph_fscache_invalidate(struct inode *inode)
 147 {
 148 }
 149
 150 static inline void ceph_invalidate_fscache_page(struct inode *inode,
 151                                                 struct page *page)
 152 {
 153 }
 154
 155 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
 156 {
 157         return 1;
 158 }
 159
 160 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
 161                                                 struct page *page)
 162 {
 163 }
 164
 165 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
 166                                                  struct list_head *pages)
 167 {
 168 }
 169
 170 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
 171 {
 172 }
 173
 174 #endif
 175
 176 #endif