fs/cifs/fscache.h

   1 /*
   2  *   fs/cifs/fscache.h - CIFS filesystem cache interface definitions
   3  *
   4  *   Copyright (c) 2010 Novell, Inc.
   5  *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #ifndef _CIFS_FSCACHE_H
  22 #define _CIFS_FSCACHE_H
  23
  24 #include <linux/fscache.h>
  25
  26 #include "cifsglob.h"
  27
  28 #ifdef CONFIG_CIFS_FSCACHE
  29
  30 extern struct fscache_netfs cifs_fscache_netfs;
  31 extern const struct fscache_cookie_def cifs_fscache_server_index_def;
  32 extern const struct fscache_cookie_def cifs_fscache_super_index_def;
  33 extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
  34
  35 extern int cifs_fscache_register(void);
  36 extern void cifs_fscache_unregister(void);
  37
  38 /*
  39  * fscache.c
  40  */
  41 extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
  42 extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
  43 extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
  44 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
  45
  46 extern void cifs_fscache_release_inode_cookie(struct inode *);
  47 extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
  48 extern void cifs_fscache_reset_inode_cookie(struct inode *);
  49
  50 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
  51 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
  52 extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
  53 extern int __cifs_readpages_from_fscache(struct inode *,
  54                                          struct address_space *,
  55                                          struct list_head *,
  56                                          unsigned *);
  57 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
  58
  59 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
  60
  61 static inline void cifs_fscache_invalidate_page(struct page *page,
  62                                                struct inode *inode)
  63 {
  64         if (PageFsCache(page))
  65                 __cifs_fscache_invalidate_page(page, inode);
  66 }
  67
  68 static inline int cifs_readpage_from_fscache(struct inode *inode,
  69                                              struct page *page)
  70 {
  71         if (CIFS_I(inode)->fscache)
  72                 return __cifs_readpage_from_fscache(inode, page);
  73
  74         return -ENOBUFS;
  75 }
  76
  77 static inline int cifs_readpages_from_fscache(struct inode *inode,
  78                                               struct address_space *mapping,
  79                                               struct list_head *pages,
  80                                               unsigned *nr_pages)
  81 {
  82         if (CIFS_I(inode)->fscache)
  83                 return __cifs_readpages_from_fscache(inode, mapping, pages,
  84                                                      nr_pages);
  85         return -ENOBUFS;
  86 }
  87
  88 static inline void cifs_readpage_to_fscache(struct inode *inode,
  89                                             struct page *page)
  90 {
  91         if (PageFsCache(page))
  92                 __cifs_readpage_to_fscache(inode, page);
  93 }
  94
  95 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
  96                                                  struct list_head *pages)
  97 {
  98         if (CIFS_I(inode)->fscache)
  99                 return __cifs_fscache_readpages_cancel(inode, pages);
 100 }
 101
 102 #else /* CONFIG_CIFS_FSCACHE */
 103 static inline int cifs_fscache_register(void) { return 0; }
 104 static inline void cifs_fscache_unregister(void) {}
 105
 106 static inline void
 107 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
 108 static inline void
 109 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
 110 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
 111 static inline void
 112 cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
 113
 114 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
 115 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
 116                                                  struct file *filp) {}
 117 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
 118 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
 119 {
 120         return 1; /* May release page */
 121 }
 122
 123 static inline void cifs_fscache_invalidate_page(struct page *page,
 124                         struct inode *inode) {}
 125 static inline int
 126 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
 127 {
 128         return -ENOBUFS;
 129 }
 130
 131 static inline int cifs_readpages_from_fscache(struct inode *inode,
 132                                               struct address_space *mapping,
 133                                               struct list_head *pages,
 134                                               unsigned *nr_pages)
 135 {
 136         return -ENOBUFS;
 137 }
 138
 139 static inline void cifs_readpage_to_fscache(struct inode *inode,
 140                         struct page *page) {}
 141
 142 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
 143                                                  struct list_head *pages)
 144 {
 145 }
 146
 147 #endif /* CONFIG_CIFS_FSCACHE */
 148
 149 #endif /* _CIFS_FSCACHE_H */