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#include <linux/fscache.h>
 16
 17int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
 18void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
 19
 20void ceph_fscache_register_inode_cookie(struct inode *inode);
 21void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
 22
 23void ceph_fscache_use_cookie(struct inode *inode, bool will_modify);
 24void ceph_fscache_unuse_cookie(struct inode *inode, bool update);
 25
 26void ceph_fscache_update(struct inode *inode);
 27void ceph_fscache_invalidate(struct inode *inode, bool dio_write);
 28
 29static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
 30{
 31	return netfs_i_cookie(&ci->netfs);
 32}
 33
 34static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
 35{
 36	struct ceph_inode_info *ci = ceph_inode(inode);
 37	struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
 38
 39	if (cookie) {
 40		ceph_fscache_use_cookie(inode, true);
 41		fscache_resize_cookie(cookie, to);
 42		ceph_fscache_unuse_cookie(inode, true);
 43	}
 44}
 45
 46static inline int ceph_fscache_unpin_writeback(struct inode *inode,
 47						struct writeback_control *wbc)
 48{
 49	return netfs_unpin_writeback(inode, wbc);
 50}
 51
 52#define ceph_fscache_dirty_folio netfs_dirty_folio
 53
 54static inline bool ceph_is_cache_enabled(struct inode *inode)
 55{
 56	return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
 57}
 58
 59#else /* CONFIG_CEPH_FSCACHE */
 60static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
 61					   struct fs_context *fc)
 62{
 63	return 0;
 64}
 65
 66static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
 67{
 68}
 69
 70static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
 71{
 72}
 73
 74static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
 75{
 76}
 77
 78static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
 79{
 80}
 81
 82static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
 83{
 84}
 85
 86static inline void ceph_fscache_update(struct inode *inode)
 87{
 88}
 89
 90static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
 91{
 92}
 93
 94static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
 95{
 96	return NULL;
 97}
 98
 99static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
100{
101}
102
103static inline int ceph_fscache_unpin_writeback(struct inode *inode,
104					       struct writeback_control *wbc)
105{
106	return 0;
107}
108
109#define ceph_fscache_dirty_folio filemap_dirty_folio
110
111static inline bool ceph_is_cache_enabled(struct inode *inode)
112{
113	return false;
114}
115#endif /* CONFIG_CEPH_FSCACHE */
116
117#endif