f7f7e7a063
There are several issues in fscache revalidation code. - In ceph_revalidate_work(), fscache_invalidate() is called when fscache_check_consistency() return 0. This is complete wrong because 0 means cache is valid. - Handle_cap_grant() calls ceph_queue_revalidate() if client already has CAP_FILE_CACHE. This code is confusing. Client should revalidate the cache each time it got CAP_FILE_CACHE anew. - In Handle_cap_grant(), fscache_invalidate() is called if MDS revokes CAP_FILE_CACHE. This is inconsistency with the case that inode get evicted. In the later case, the cache is not discarded. Client may use the cache when inode is reloaded. This patch moves the fscache revalidation into ceph_get_caps(). Client revalidates the cache after it gets CAP_FILE_CACHE. i_rdcache_gen should keep constance while CAP_FILE_CACHE is used. If i_fscache_gen is not equal to i_rdcache_gen, client needs to check cache's consistency. Signed-off-by: Yan, Zheng <zyan@redhat.com>
191 lines
4.7 KiB
C
191 lines
4.7 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_register_inode_cookie(struct inode *inode);
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
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void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
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void ceph_fscache_revalidate_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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static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
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{
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ci->fscache = NULL;
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ci->i_fscache_gen = 0;
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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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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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static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
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{
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ci->i_fscache_gen = ci->i_rdcache_gen - 1;
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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 inode *inode)
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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 void ceph_fscache_file_set_cookie(struct inode *inode,
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struct file *filp)
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{
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}
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static inline void ceph_fscache_revalidate_cookie(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 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_disable_fscache_readpage(struct ceph_inode_info *ci)
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{
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}
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#endif
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#endif
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