LXR linux/fs/9p/cache.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * V9FS cache definitions.
   4 *
   5 *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
   6 */
   7
   8#ifndef _9P_CACHE_H
   9#define _9P_CACHE_H
  10#ifdef CONFIG_9P_FSCACHE
  11#include <linux/fscache.h>
  12#include <linux/spinlock.h>
  13
  14extern struct fscache_netfs v9fs_cache_netfs;
  15extern const struct fscache_cookie_def v9fs_cache_session_index_def;
  16extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
  17
  18extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
  19extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
  20
  21extern void v9fs_cache_inode_get_cookie(struct inode *inode);
  22extern void v9fs_cache_inode_put_cookie(struct inode *inode);
  23extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
  24extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
  25extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
  26
  27extern int __v9fs_cache_register(void);
  28extern void __v9fs_cache_unregister(void);
  29
  30extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
  31extern void __v9fs_fscache_invalidate_page(struct page *page);
  32extern int __v9fs_readpage_from_fscache(struct inode *inode,
  33                                        struct page *page);
  34extern int __v9fs_readpages_from_fscache(struct inode *inode,
  35                                         struct address_space *mapping,
  36                                         struct list_head *pages,
  37                                         unsigned *nr_pages);
  38extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
  39extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
  40                                              struct page *page);
  41
  42static inline int v9fs_fscache_release_page(struct page *page,
  43                                            gfp_t gfp)
  44{
  45        return __v9fs_fscache_release_page(page, gfp);
  46}
  47
  48static inline void v9fs_fscache_invalidate_page(struct page *page)
  49{
  50        __v9fs_fscache_invalidate_page(page);
  51}
  52
  53static inline int v9fs_readpage_from_fscache(struct inode *inode,
  54                                             struct page *page)
  55{
  56        return __v9fs_readpage_from_fscache(inode, page);
  57}
  58
  59static inline int v9fs_readpages_from_fscache(struct inode *inode,
  60                                              struct address_space *mapping,
  61                                              struct list_head *pages,
  62                                              unsigned *nr_pages)
  63{
  64        return __v9fs_readpages_from_fscache(inode, mapping, pages,
  65                                             nr_pages);
  66}
  67
  68static inline void v9fs_readpage_to_fscache(struct inode *inode,
  69                                            struct page *page)
  70{
  71        if (PageFsCache(page))
  72                __v9fs_readpage_to_fscache(inode, page);
  73}
  74
  75static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
  76{
  77        struct v9fs_inode *v9inode = V9FS_I(inode);
  78        fscache_uncache_page(v9inode->fscache, page);
  79        BUG_ON(PageFsCache(page));
  80}
  81
  82static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
  83                                                   struct page *page)
  84{
  85        return __v9fs_fscache_wait_on_page_write(inode, page);
  86}
  87
  88#else /* CONFIG_9P_FSCACHE */
  89
  90static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
  91{
  92}
  93
  94static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
  95{
  96}
  97
  98static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
  99{
 100}
 101
 102static inline int v9fs_fscache_release_page(struct page *page,
 103                                            gfp_t gfp) {
 104        return 1;
 105}
 106
 107static inline void v9fs_fscache_invalidate_page(struct page *page) {}
 108
 109static inline int v9fs_readpage_from_fscache(struct inode *inode,
 110                                             struct page *page)
 111{
 112        return -ENOBUFS;
 113}
 114
 115static inline int v9fs_readpages_from_fscache(struct inode *inode,
 116                                              struct address_space *mapping,
 117                                              struct list_head *pages,
 118                                              unsigned *nr_pages)
 119{
 120        return -ENOBUFS;
 121}
 122
 123static inline void v9fs_readpage_to_fscache(struct inode *inode,
 124                                            struct page *page)
 125{}
 126
 127static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
 128{}
 129
 130static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
 131                                                   struct page *page)
 132{
 133        return;
 134}
 135
 136#endif /* CONFIG_9P_FSCACHE */
 137#endif /* _9P_CACHE_H */
 138