fd2421f544
This make sure we don't use wrong inode from the inode hash. The inode number of the file deleted is reused by the next file system object created and if we only use inode number for inode hash lookup we could end up with wrong struct inode. Also compare inode generation number. Not all Linux file system provide st_gen in userspace. So it could be 0; Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/*
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* V9FS cache definitions.
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*
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* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
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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 _9P_CACHE_H
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#ifdef CONFIG_9P_FSCACHE
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#include <linux/fscache.h>
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#include <linux/spinlock.h>
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extern struct fscache_netfs v9fs_cache_netfs;
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extern const struct fscache_cookie_def v9fs_cache_session_index_def;
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extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
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extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
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extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
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extern void v9fs_cache_inode_get_cookie(struct inode *inode);
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extern void v9fs_cache_inode_put_cookie(struct inode *inode);
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extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
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extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
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extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
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extern int __v9fs_cache_register(void);
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extern void __v9fs_cache_unregister(void);
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extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
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extern void __v9fs_fscache_invalidate_page(struct page *page);
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extern int __v9fs_readpage_from_fscache(struct inode *inode,
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struct page *page);
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extern int __v9fs_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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extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
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extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
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struct page *page);
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static inline int v9fs_fscache_release_page(struct page *page,
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gfp_t gfp)
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{
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return __v9fs_fscache_release_page(page, gfp);
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}
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static inline void v9fs_fscache_invalidate_page(struct page *page)
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{
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__v9fs_fscache_invalidate_page(page);
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}
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static inline int v9fs_readpage_from_fscache(struct inode *inode,
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struct page *page)
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{
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return __v9fs_readpage_from_fscache(inode, page);
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}
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static inline int v9fs_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 __v9fs_readpages_from_fscache(inode, mapping, pages,
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nr_pages);
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}
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static inline void v9fs_readpage_to_fscache(struct inode *inode,
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struct page *page)
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{
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if (PageFsCache(page))
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__v9fs_readpage_to_fscache(inode, page);
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}
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static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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fscache_uncache_page(v9inode->fscache, page);
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BUG_ON(PageFsCache(page));
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}
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static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
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struct page *page)
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{
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return __v9fs_fscache_wait_on_page_write(inode, page);
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}
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#else /* CONFIG_9P_FSCACHE */
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static inline int v9fs_fscache_release_page(struct page *page,
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gfp_t gfp) {
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return 1;
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}
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static inline void v9fs_fscache_invalidate_page(struct page *page) {}
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static inline int v9fs_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 v9fs_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 v9fs_readpage_to_fscache(struct inode *inode,
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struct page *page)
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{}
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static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
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{}
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static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
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struct page *page)
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{
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return;
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}
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#endif /* CONFIG_9P_FSCACHE */
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#endif /* _9P_CACHE_H */
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