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
 30extern struct fscache_netfs cifs_fscache_netfs;
 31extern const struct fscache_cookie_def cifs_fscache_server_index_def;
 32extern const struct fscache_cookie_def cifs_fscache_super_index_def;
 33extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
 34
 35extern int cifs_fscache_register(void);
 36extern void cifs_fscache_unregister(void);
 37
 38/*
 39 * fscache.c
 40 */
 41extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
 42extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
 43extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
 44extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
 45
 46extern void cifs_fscache_release_inode_cookie(struct inode *);
 47extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
 48extern void cifs_fscache_reset_inode_cookie(struct inode *);
 49
 50extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
 51extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
 52extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
 53extern int __cifs_readpages_from_fscache(struct inode *,
 54					 struct address_space *,
 55					 struct list_head *,
 56					 unsigned *);
 57
 58extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
 59
 60static inline void cifs_fscache_invalidate_page(struct page *page,
 61					       struct inode *inode)
 62{
 63	if (PageFsCache(page))
 64		__cifs_fscache_invalidate_page(page, inode);
 65}
 66
 67static inline int cifs_readpage_from_fscache(struct inode *inode,
 68					     struct page *page)
 69{
 70	if (CIFS_I(inode)->fscache)
 71		return __cifs_readpage_from_fscache(inode, page);
 72
 73	return -ENOBUFS;
 74}
 75
 76static inline int cifs_readpages_from_fscache(struct inode *inode,
 77					      struct address_space *mapping,
 78					      struct list_head *pages,
 79					      unsigned *nr_pages)
 80{
 81	if (CIFS_I(inode)->fscache)
 82		return __cifs_readpages_from_fscache(inode, mapping, pages,
 83						     nr_pages);
 84	return -ENOBUFS;
 85}
 86
 87static inline void cifs_readpage_to_fscache(struct inode *inode,
 88					    struct page *page)
 89{
 90	if (PageFsCache(page))
 91		__cifs_readpage_to_fscache(inode, page);
 92}
 93
 94#else /* CONFIG_CIFS_FSCACHE */
 95static inline int cifs_fscache_register(void) { return 0; }
 96static inline void cifs_fscache_unregister(void) {}
 97
 98static inline void
 99cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
100static inline void
101cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
102static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
103static inline void
104cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
105
106static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
107static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
108						 struct file *filp) {}
109static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
110static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
111{
112	return 1; /* May release page */
113}
114
115static inline void cifs_fscache_invalidate_page(struct page *page,
116			struct inode *inode) {}
117static inline int
118cifs_readpage_from_fscache(struct inode *inode, struct page *page)
119{
120	return -ENOBUFS;
121}
122
123static inline int cifs_readpages_from_fscache(struct inode *inode,
124					      struct address_space *mapping,
125					      struct list_head *pages,
126					      unsigned *nr_pages)
127{
128	return -ENOBUFS;
129}
130
131static inline void cifs_readpage_to_fscache(struct inode *inode,
132			struct page *page) {}
133
134#endif /* CONFIG_CIFS_FSCACHE */
135
136#endif /* _CIFS_FSCACHE_H */