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);
  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 {
  93         return 0;
  94 }
  95
  96 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  97 {
  98 }
  99
 100 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
 101 {
 102 }
 103
 104 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
 105 {
 106 }
 107
 108 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
 109 {
 110 }
 111
 112 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
 113                                                 struct file *filp)
 114 {
 115 }
 116
 117 static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
 118 {
 119 }
 120
 121 static inline void ceph_fscache_uncache_page(struct inode *inode,
 122                                              struct page *pages)
 123 {
 124 }
 125
 126 static inline int ceph_readpage_from_fscache(struct inode* inode,
 127                                              struct page *page)
 128 {
 129         return -ENOBUFS;
 130 }
 131
 132 static inline int ceph_readpages_from_fscache(struct inode *inode,
 133                                               struct address_space *mapping,
 134                                               struct list_head *pages,
 135                                               unsigned *nr_pages)
 136 {
 137         return -ENOBUFS;
 138 }
 139
 140 static inline void ceph_readpage_to_fscache(struct inode *inode,
 141                                             struct page *page)
 142 {
 143 }
 144
 145 static inline void ceph_fscache_invalidate(struct inode *inode)
 146 {
 147 }
 148
 149 static inline void ceph_invalidate_fscache_page(struct inode *inode,
 150                                                 struct page *page)
 151 {
 152 }
 153
 154 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
 155 {
 156         return 1;
 157 }
 158
 159 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
 160                                                 struct page *page)
 161 {
 162 }
 163
 164 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
 165                                                  struct list_head *pages)
 166 {
 167 }
 168
 169 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
 170 {
 171 }
 172
 173 #endif
 174
 175 #endif