/* * Ceph cache definitions. * *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. *  Written by Milosz Tanski (milosz@adfin.com) * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License version 2 *  as published by the Free Software Foundation. * *  This program 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 General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to: *  Free Software Foundation *  51 Franklin Street, Fifth Floor *  Boston, MA  02111-1301  USA * */ #ifndef _CEPH_CACHE_H#define _CEPH_CACHE_H #ifdef CONFIG_CEPH_FSCACHE extern struct fscache_netfs ceph_cache_netfs; int ceph_fscache_register(void);void ceph_fscache_unregister(void); int ceph_fscache_register_fs(struct ceph_fs_client* fsc);void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc); void ceph_fscache_register_inode_cookie(struct inode *inode);void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci); int ceph_readpage_from_fscache(struct inode *inode, struct page *page);int ceph_readpages_from_fscache(struct inode *inode,				struct address_space *mapping,				struct list_head *pages,				unsigned *nr_pages);void ceph_readpage_to_fscache(struct inode *inode, struct page *page);void ceph_invalidate_fscache_page(struct inode* inode, struct page *page); static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci){	ci->fscache = NULL;	ci->i_fscache_gen = 0;} static inline void ceph_fscache_invalidate(struct inode *inode){	fscache_invalidate(ceph_inode(inode)->fscache);} static inline void ceph_fscache_uncache_page(struct inode *inode,					     struct page *page){	struct ceph_inode_info *ci = ceph_inode(inode);	return fscache_uncache_page(ci->fscache, page);} static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp){	struct inode* inode = page->mapping->host;	struct ceph_inode_info *ci = ceph_inode(inode);	return fscache_maybe_release_page(ci->fscache, page, gfp);} static inline void ceph_fscache_readpage_cancel(struct inode *inode,						struct page *page){	struct ceph_inode_info *ci = ceph_inode(inode);	if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))		__fscache_uncache_page(ci->fscache, page);} static inline void ceph_fscache_readpages_cancel(struct inode *inode,						 struct list_head *pages){	struct ceph_inode_info *ci = ceph_inode(inode);	return fscache_readpages_cancel(ci->fscache, pages);} static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci){	ci->i_fscache_gen = ci->i_rdcache_gen - 1;} #else static inline int ceph_fscache_register(void){	return 0;} static inline void ceph_fscache_unregister(void){} static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc){	return 0;} static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc){} static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci){} static inline void ceph_fscache_register_inode_cookie(struct inode *inode){} static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci){} static inline void ceph_fscache_file_set_cookie(struct inode *inode,						struct file *filp){} static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci){} static inline void ceph_fscache_uncache_page(struct inode *inode,					     struct page *pages){} static inline int ceph_readpage_from_fscache(struct inode* inode,					     struct page *page){	return -ENOBUFS;} static inline int ceph_readpages_from_fscache(struct inode *inode,					      struct address_space *mapping,					      struct list_head *pages,					      unsigned *nr_pages){	return -ENOBUFS;} static inline void ceph_readpage_to_fscache(struct inode *inode,					    struct page *page){} static inline void ceph_fscache_invalidate(struct inode *inode){} static inline void ceph_invalidate_fscache_page(struct inode *inode,						struct page *page){} static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp){	return 1;} static inline void ceph_fscache_readpage_cancel(struct inode *inode,						struct page *page){} static inline void ceph_fscache_readpages_cancel(struct inode *inode,						 struct list_head *pages){} static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci){} #endif #endif