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 void ceph_fscache_unpin_writeback(struct inode *inode,
 47						struct writeback_control *wbc)
 48{
 49	fscache_unpin_writeback(wbc, ceph_fscache_cookie(ceph_inode(inode)));
 50}
 51
 52static inline int ceph_fscache_dirty_folio(struct address_space *mapping,
 53		struct folio *folio)
 54{
 55	struct ceph_inode_info *ci = ceph_inode(mapping->host);
 56
 57	return fscache_dirty_folio(mapping, folio, ceph_fscache_cookie(ci));
 58}
 59
 60static inline int ceph_begin_cache_operation(struct netfs_io_request *rreq)
 61{
 62	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
 63
 64	return fscache_begin_read_operation(&rreq->cache_resources, cookie);
 65}
 66
 67static inline bool ceph_is_cache_enabled(struct inode *inode)
 68{
 69	return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
 70}
 71
 72static inline void ceph_fscache_note_page_release(struct inode *inode)
 73{
 74	struct ceph_inode_info *ci = ceph_inode(inode);
 75
 76	fscache_note_page_release(ceph_fscache_cookie(ci));
 77}
 78#else /* CONFIG_CEPH_FSCACHE */
 79static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
 80					   struct fs_context *fc)
 81{
 82	return 0;
 83}
 84
 85static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
 86{
 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_use_cookie(struct inode *inode, bool will_modify)
 98{
 99}
100
101static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
102{
103}
104
105static inline void ceph_fscache_update(struct inode *inode)
106{
107}
108
109static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
110{
111}
112
113static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
114{
115	return NULL;
116}
117
118static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
119{
120}
121
122static inline void ceph_fscache_unpin_writeback(struct inode *inode,
123						struct writeback_control *wbc)
124{
125}
126
127static inline int ceph_fscache_dirty_folio(struct address_space *mapping,
128		struct folio *folio)
129{
130	return filemap_dirty_folio(mapping, folio);
131}
132
133static inline bool ceph_is_cache_enabled(struct inode *inode)
134{
135	return false;
136}
137
138static inline int ceph_begin_cache_operation(struct netfs_io_request *rreq)
139{
140	return -ENOBUFS;
141}
142
143static inline void ceph_fscache_note_page_release(struct inode *inode)
144{
145}
146#endif /* CONFIG_CEPH_FSCACHE */
147
148#endif