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