LXR linux/fs/ceph/cache.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Ceph cache definitions.
   4 *
   5 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
   6 *  Written by Milosz Tanski (milosz@adfin.com)
   7 */
   8
   9#ifndef _CEPH_CACHE_H
  10#define _CEPH_CACHE_H
  11
  12#include <linux/netfs.h>
  13
  14#ifdef CONFIG_CEPH_FSCACHE
  15
  16extern struct fscache_netfs ceph_cache_netfs;
  17
  18int ceph_fscache_register(void);
  19void ceph_fscache_unregister(void);
  20
  21int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
  22void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
  23
  24void ceph_fscache_register_inode_cookie(struct inode *inode);
  25void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
  26void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
  27void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
  28
  29static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  30{
  31        ci->fscache = NULL;
  32}
  33
  34static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
  35{
  36        return ci->fscache;
  37}
  38
  39static inline void ceph_fscache_invalidate(struct inode *inode)
  40{
  41        fscache_invalidate(ceph_inode(inode)->fscache);
  42}
  43
  44static inline bool ceph_is_cache_enabled(struct inode *inode)
  45{
  46        struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(inode));
  47
  48        if (!cookie)
  49                return false;
  50        return fscache_cookie_enabled(cookie);
  51}
  52
  53static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
  54{
  55        struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
  56
  57        return fscache_begin_read_operation(rreq, cookie);
  58}
  59#else
  60
  61static inline int ceph_fscache_register(void)
  62{
  63        return 0;
  64}
  65
  66static inline void ceph_fscache_unregister(void)
  67{
  68}
  69
  70static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
  71                                           struct fs_context *fc)
  72{
  73        return 0;
  74}
  75
  76static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  77{
  78}
  79
  80static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  81{
  82}
  83
  84static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
  85{
  86        return NULL;
  87}
  88
  89static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
  90{
  91}
  92
  93static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
  94{
  95}
  96
  97static inline void ceph_fscache_file_set_cookie(struct inode *inode,
  98                                                struct file *filp)
  99{
 100}
 101
 102static inline void ceph_fscache_invalidate(struct inode *inode)
 103{
 104}
 105
 106static inline bool ceph_is_cache_enabled(struct inode *inode)
 107{
 108        return false;
 109}
 110
 111static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
 112{
 113        return -ENOBUFS;
 114}
 115#endif
 116
 117#endif /* _CEPH_CACHE_H */
 118