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#include <linux/ceph/ceph_debug.h>
10
11#include <linux/fs_context.h>
12#include "super.h"
13#include "cache.h"
14
15void ceph_fscache_register_inode_cookie(struct inode *inode)
16{
17	struct ceph_inode_info *ci = ceph_inode(inode);
18	struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
19
20	/* No caching for filesystem? */
21	if (!fsc->fscache)
22		return;
23
24	/* Regular files only */
25	if (!S_ISREG(inode->i_mode))
26		return;
27
28	/* Only new inodes! */
29	if (!(inode->i_state & I_NEW))
30		return;
31
32	WARN_ON_ONCE(ci->netfs.cache);
33
34	ci->netfs.cache =
35		fscache_acquire_cookie(fsc->fscache, 0,
36				       &ci->i_vino, sizeof(ci->i_vino),
37				       &ci->i_version, sizeof(ci->i_version),
38				       i_size_read(inode));
39	if (ci->netfs.cache)
40		mapping_set_release_always(inode->i_mapping);
41}
42
43void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
44{
45	fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
46}
47
48void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
49{
50	struct ceph_inode_info *ci = ceph_inode(inode);
51
52	fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
53}
54
55void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
56{
57	struct ceph_inode_info *ci = ceph_inode(inode);
58
59	if (update) {
60		loff_t i_size = i_size_read(inode);
61
62		fscache_unuse_cookie(ceph_fscache_cookie(ci),
63				     &ci->i_version, &i_size);
64	} else {
65		fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
66	}
67}
68
69void ceph_fscache_update(struct inode *inode)
70{
71	struct ceph_inode_info *ci = ceph_inode(inode);
72	loff_t i_size = i_size_read(inode);
73
74	fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
75}
76
77void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
78{
79	struct ceph_inode_info *ci = ceph_inode(inode);
80
81	fscache_invalidate(ceph_fscache_cookie(ci),
82			   &ci->i_version, i_size_read(inode),
83			   dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
84}
85
86int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
87{
88	const struct ceph_fsid *fsid = &fsc->client->fsid;
89	const char *fscache_uniq = fsc->mount_options->fscache_uniq;
90	size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
91	char *name;
92	int err = 0;
93
94	name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
95			 uniq_len ? fscache_uniq : "");
96	if (!name)
97		return -ENOMEM;
98
99	fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
100	if (IS_ERR_OR_NULL(fsc->fscache)) {
101		errorfc(fc, "Unable to register fscache cookie for %s", name);
102		err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
103		fsc->fscache = NULL;
104	}
105	kfree(name);
106	return err;
107}
108
109void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
110{
111	fscache_relinquish_volume(fsc->fscache, NULL, false);
112}
113