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54afa99057
In cifs_readpages(), we may decide we don't want to read a page after all - but the page may already have passed through fscache_read_or_alloc_pages() and thus have marks and reservations set. Thus we have to call fscache_readpages_cancel() or fscache_uncache_page() on the pages we're returning to clear the marks. NFS, AFS and 9P should be unaffected by this as they call read_cache_pages() which does the cleanup for you. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/*
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* fs/cifs/fscache.h - CIFS filesystem cache interface definitions
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*
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* Copyright (c) 2010 Novell, Inc.
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* Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library 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
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _CIFS_FSCACHE_H
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#define _CIFS_FSCACHE_H
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#include <linux/fscache.h>
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#include "cifsglob.h"
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#ifdef CONFIG_CIFS_FSCACHE
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extern struct fscache_netfs cifs_fscache_netfs;
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extern const struct fscache_cookie_def cifs_fscache_server_index_def;
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extern const struct fscache_cookie_def cifs_fscache_super_index_def;
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extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
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extern int cifs_fscache_register(void);
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extern void cifs_fscache_unregister(void);
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/*
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* fscache.c
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*/
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extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
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extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
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extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
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extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
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extern void cifs_fscache_release_inode_cookie(struct inode *);
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extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
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extern void cifs_fscache_reset_inode_cookie(struct inode *);
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extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
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extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
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extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
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extern int __cifs_readpages_from_fscache(struct inode *,
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struct address_space *,
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struct list_head *,
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unsigned *);
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extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
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extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
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static inline void cifs_fscache_invalidate_page(struct page *page,
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struct inode *inode)
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{
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if (PageFsCache(page))
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__cifs_fscache_invalidate_page(page, inode);
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}
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static inline int cifs_readpage_from_fscache(struct inode *inode,
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struct page *page)
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{
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if (CIFS_I(inode)->fscache)
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return __cifs_readpage_from_fscache(inode, page);
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return -ENOBUFS;
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}
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static inline int cifs_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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if (CIFS_I(inode)->fscache)
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return __cifs_readpages_from_fscache(inode, mapping, pages,
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nr_pages);
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return -ENOBUFS;
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}
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static inline void cifs_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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__cifs_readpage_to_fscache(inode, page);
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}
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static inline void cifs_fscache_readpages_cancel(struct inode *inode,
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struct list_head *pages)
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{
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if (CIFS_I(inode)->fscache)
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return __cifs_fscache_readpages_cancel(inode, pages);
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}
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#else /* CONFIG_CIFS_FSCACHE */
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static inline int cifs_fscache_register(void) { return 0; }
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static inline void cifs_fscache_unregister(void) {}
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static inline void
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cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
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static inline void
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cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
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static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
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static inline void
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cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
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static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
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static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
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struct file *filp) {}
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static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
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static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
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{
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return 1; /* May release page */
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}
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static inline void cifs_fscache_invalidate_page(struct page *page,
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struct inode *inode) {}
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static inline int
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cifs_readpage_from_fscache(struct inode *inode, struct page *page)
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{
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return -ENOBUFS;
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}
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static inline int cifs_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 cifs_readpage_to_fscache(struct inode *inode,
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struct page *page) {}
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static inline void cifs_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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#endif /* CONFIG_CIFS_FSCACHE */
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#endif /* _CIFS_FSCACHE_H */
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