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
  16 extern struct fscache_netfs ceph_cache_netfs;
  17
  18 int ceph_fscache_register(void);
  19 void ceph_fscache_unregister(void);
  20
  21 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
  22 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
  23
  24 void ceph_fscache_register_inode_cookie(struct inode *inode);
  25 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
  26 void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
  27 void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
  28
  29 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  30 {
  31         ci->fscache = NULL;
  32 }
  33
  34 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
  35 {
  36         return ci->fscache;
  37 }
  38
  39 static inline void ceph_fscache_invalidate(struct inode *inode)
  40 {
  41         fscache_invalidate(ceph_inode(inode)->fscache);
  42 }
  43
  44 static 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
  53 static 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
  61 static inline int ceph_fscache_register(void)
  62 {
  63         return 0;
  64 }
  65
  66 static inline void ceph_fscache_unregister(void)
  67 {
  68 }
  69
  70 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
  71                                            struct fs_context *fc)
  72 {
  73         return 0;
  74 }
  75
  76 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
  77 {
  78 }
  79
  80 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
  81 {
  82 }
  83
  84 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
  85 {
  86         return NULL;
  87 }
  88
  89 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
  90 {
  91 }
  92
  93 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
  94 {
  95 }
  96
  97 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
  98                                                 struct file *filp)
  99 {
 100 }
 101
 102 static inline void ceph_fscache_invalidate(struct inode *inode)
 103 {
 104 }
 105
 106 static inline bool ceph_is_cache_enabled(struct inode *inode)
 107 {
 108         return false;
 109 }
 110
 111 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
 112 {
 113         return -ENOBUFS;
 114 }
 115 #endif
 116
 117 #endif /* _CEPH_CACHE_H */