cache.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* V9FS cache definitions.
*
* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
*/
#ifndef _9P_CACHE_H
#define _9P_CACHE_H
#ifdef CONFIG_9P_FSCACHE
#include <linux/fscache.h>
#include <linux/spinlock.h>
extern struct fscache_netfs v9fs_cache_netfs;
extern const struct fscache_cookie_def v9fs_cache_session_index_def;
extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
extern void v9fs_cache_inode_get_cookie(struct inode *inode);
extern void v9fs_cache_inode_put_cookie(struct inode *inode);
extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
extern int __v9fs_cache_register(void);
extern void __v9fs_cache_unregister(void);
extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
extern void __v9fs_fscache_invalidate_page(struct page *page);
extern int __v9fs_readpage_from_fscache(struct inode *inode,
struct page *page);
extern int __v9fs_readpages_from_fscache(struct inode *inode,
struct address_space *mapping,
struct list_head *pages,
unsigned *nr_pages);
extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
struct page *page);
static inline int v9fs_fscache_release_page(struct page *page,
gfp_t gfp)
{
return __v9fs_fscache_release_page(page, gfp);
}
static inline void v9fs_fscache_invalidate_page(struct page *page)
{
__v9fs_fscache_invalidate_page(page);
}
static inline int v9fs_readpage_from_fscache(struct inode *inode,
struct page *page)
{
return __v9fs_readpage_from_fscache(inode, page);
}
static inline int v9fs_readpages_from_fscache(struct inode *inode,
struct address_space *mapping,
struct list_head *pages,
unsigned *nr_pages)
{
return __v9fs_readpages_from_fscache(inode, mapping, pages,
nr_pages);
}
static inline void v9fs_readpage_to_fscache(struct inode *inode,
struct page *page)
{
if (PageFsCache(page))
__v9fs_readpage_to_fscache(inode, page);
}
static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
fscache_uncache_page(v9inode->fscache, page);
BUG_ON(PageFsCache(page));
}
static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
struct page *page)
{
return __v9fs_fscache_wait_on_page_write(inode, page);
}
#else /* CONFIG_9P_FSCACHE */
static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
{
}
static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
{
}
static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
{
}
static inline int v9fs_fscache_release_page(struct page *page,
gfp_t gfp) {
return 1;
}
static inline void v9fs_fscache_invalidate_page(struct page *page) {}
static inline int v9fs_readpage_from_fscache(struct inode *inode,
struct page *page)
{
return -ENOBUFS;
}
static inline int v9fs_readpages_from_fscache(struct inode *inode,
struct address_space *mapping,
struct list_head *pages,
unsigned *nr_pages)
{
return -ENOBUFS;
}
static inline void v9fs_readpage_to_fscache(struct inode *inode,
struct page *page)
{}
static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
{}
static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
struct page *page)
{
return;
}
#endif /* CONFIG_9P_FSCACHE */
#endif /* _9P_CACHE_H */