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Diffstat (limited to 'fs/cifs/fscache.h')
| -rw-r--r-- | fs/cifs/fscache.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h new file mode 100644 index 000000000..8c0862e41 --- /dev/null +++ b/fs/cifs/fscache.h @@ -0,0 +1,164 @@ +/* + * fs/cifs/fscache.h - CIFS filesystem cache interface definitions + * + * Copyright (c) 2010 Novell, Inc. + * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published + * by the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This library 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 Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef _CIFS_FSCACHE_H +#define _CIFS_FSCACHE_H + +#include <linux/fscache.h> + +#include "cifsglob.h" + +#ifdef CONFIG_CIFS_FSCACHE + +/* + * Auxiliary data attached to CIFS inode within the cache + */ +struct cifs_fscache_inode_auxdata { + u64 last_write_time_sec; + u64 last_change_time_sec; + u32 last_write_time_nsec; + u32 last_change_time_nsec; + u64 eof; +}; + +/* + * cache.c + */ +extern struct fscache_netfs cifs_fscache_netfs; +extern const struct fscache_cookie_def cifs_fscache_server_index_def; +extern const struct fscache_cookie_def cifs_fscache_super_index_def; +extern const struct fscache_cookie_def cifs_fscache_inode_object_def; + +extern int cifs_fscache_register(void); +extern void cifs_fscache_unregister(void); +extern char *extract_sharename(const char *); + +/* + * fscache.c + */ +extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *); +extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *); +extern void cifs_fscache_get_super_cookie(struct cifs_tcon *); +extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); + +extern void cifs_fscache_release_inode_cookie(struct inode *); +extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *); +extern void cifs_fscache_reset_inode_cookie(struct inode *); + +extern void __cifs_fscache_invalidate_page(struct page *, struct inode *); +extern int cifs_fscache_release_page(struct page *page, gfp_t gfp); +extern int __cifs_readpage_from_fscache(struct inode *, struct page *); +extern int __cifs_readpages_from_fscache(struct inode *, + struct address_space *, + struct list_head *, + unsigned *); +extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *); + +extern void __cifs_readpage_to_fscache(struct inode *, struct page *); + +static inline void cifs_fscache_invalidate_page(struct page *page, + struct inode *inode) +{ + if (PageFsCache(page)) + __cifs_fscache_invalidate_page(page, inode); +} + +static inline int cifs_readpage_from_fscache(struct inode *inode, + struct page *page) +{ + if (CIFS_I(inode)->fscache) + return __cifs_readpage_from_fscache(inode, page); + + return -ENOBUFS; +} + +static inline int cifs_readpages_from_fscache(struct inode *inode, + struct address_space *mapping, + struct list_head *pages, + unsigned *nr_pages) +{ + if (CIFS_I(inode)->fscache) + return __cifs_readpages_from_fscache(inode, mapping, pages, + nr_pages); + return -ENOBUFS; +} + +static inline void cifs_readpage_to_fscache(struct inode *inode, + struct page *page) +{ + if (PageFsCache(page)) + __cifs_readpage_to_fscache(inode, page); +} + +static inline void cifs_fscache_readpages_cancel(struct inode *inode, + struct list_head *pages) +{ + if (CIFS_I(inode)->fscache) + return __cifs_fscache_readpages_cancel(inode, pages); +} + +#else /* CONFIG_CIFS_FSCACHE */ +static inline int cifs_fscache_register(void) { return 0; } +static inline void cifs_fscache_unregister(void) {} + +static inline void +cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {} +static inline void +cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {} +static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {} +static inline void +cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} + +static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} +static inline void cifs_fscache_set_inode_cookie(struct inode *inode, + struct file *filp) {} +static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {} +static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp) +{ + return 1; /* May release page */ +} + +static inline void cifs_fscache_invalidate_page(struct page *page, + struct inode *inode) {} +static inline int +cifs_readpage_from_fscache(struct inode *inode, struct page *page) +{ + return -ENOBUFS; +} + +static inline int cifs_readpages_from_fscache(struct inode *inode, + struct address_space *mapping, + struct list_head *pages, + unsigned *nr_pages) +{ + return -ENOBUFS; +} + +static inline void cifs_readpage_to_fscache(struct inode *inode, + struct page *page) {} + +static inline void cifs_fscache_readpages_cancel(struct inode *inode, + struct list_head *pages) +{ +} + +#endif /* CONFIG_CIFS_FSCACHE */ + +#endif /* _CIFS_FSCACHE_H */ |