/* * fs/cifs/fscache.h - CIFS filesystem cache interface definitions * * Copyright (c) 2010 Novell, Inc. * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _CIFS_FSCACHE_H #define _CIFS_FSCACHE_H #include <linux/fscache.h> #include "cifsglob.h" #ifdef CONFIG_CIFS_FSCACHE extern struct fscache_netfs cifs_fscache_netfs; extern const struct fscache_cookie_def cifs_fscache_server_index_def; extern const struct fscache_cookie_def cifs_fscache_super_index_def; extern const struct fscache_cookie_def cifs_fscache_inode_object_def; extern int cifs_fscache_register(void); extern void cifs_fscache_unregister(void); /* * fscache.c */ extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *); extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *); extern void cifs_fscache_get_super_cookie(struct cifs_tcon *); extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); extern void cifs_fscache_release_inode_cookie(struct inode *); extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *); extern void cifs_fscache_reset_inode_cookie(struct inode *); extern void __cifs_fscache_invalidate_page(struct page *, struct inode *); extern int cifs_fscache_release_page(struct page *page, gfp_t gfp); extern int __cifs_readpage_from_fscache(struct inode *, struct page *); extern int __cifs_readpages_from_fscache(struct inode *, struct address_space *, struct list_head *, unsigned *); extern void __cifs_readpage_to_fscache(struct inode *, struct page *); static inline void cifs_fscache_invalidate_page(struct page *page, struct inode *inode) { if (PageFsCache(page)) __cifs_fscache_invalidate_page(page, inode); } static inline int cifs_readpage_from_fscache(struct inode *inode, struct page *page) { if (CIFS_I(inode)->fscache) return __cifs_readpage_from_fscache(inode, page); return -ENOBUFS; } static inline int cifs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { if (CIFS_I(inode)->fscache) return __cifs_readpages_from_fscache(inode, mapping, pages, nr_pages); return -ENOBUFS; } static inline void cifs_readpage_to_fscache(struct inode *inode, struct page *page) { if (PageFsCache(page)) __cifs_readpage_to_fscache(inode, page); } #else /* CONFIG_CIFS_FSCACHE */ static inline int cifs_fscache_register(void) { return 0; } static inline void cifs_fscache_unregister(void) {} static inline void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {} static inline void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {} static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {} static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} static inline void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp) {} static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {} static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp) { return 1; /* May release page */ } static inline void cifs_fscache_invalidate_page(struct page *page, struct inode *inode) {} static inline int cifs_readpage_from_fscache(struct inode *inode, struct page *page) { return -ENOBUFS; } static inline int cifs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { return -ENOBUFS; } static inline void cifs_readpage_to_fscache(struct inode *inode, struct page *page) {} #endif /* CONFIG_CIFS_FSCACHE */ #endif /* _CIFS_FSCACHE_H */