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_state_read_once(inode) & I_NEW))
30 return;
31
32 WARN_ON_ONCE(ci->netfs.cache);
33
34 ci->netfs.cache =
35 fscache_acquire_cookie(volume: fsc->fscache, advice: 0,
36 index_key: &ci->i_vino, index_key_len: sizeof(ci->i_vino),
37 aux_data: &ci->i_version, aux_data_len: sizeof(ci->i_version),
38 object_size: i_size_read(inode));
39 if (ci->netfs.cache)
40 mapping_set_release_always(mapping: inode->i_mapping);
41}
42
43void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
44{
45 fscache_relinquish_cookie(cookie: ceph_fscache_cookie(ci), retire: 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(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(cookie: ceph_fscache_cookie(ci),
63 aux_data: &ci->i_version, object_size: &i_size);
64 } else {
65 fscache_unuse_cookie(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(cookie: ceph_fscache_cookie(ci), aux_data: &ci->i_version, object_size: &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(cookie: ceph_fscache_cookie(ci),
82 aux_data: &ci->i_version, size: i_size_read(inode),
83 flags: 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, fmt: "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(volume_key: name, NULL, NULL, coherency_len: 0);
100 if (IS_ERR_OR_NULL(ptr: fsc->fscache)) {
101 errorfc(fc, "Unable to register fscache cookie for %s", name);
102 err = fsc->fscache ? PTR_ERR(ptr: fsc->fscache) : -EOPNOTSUPP;
103 fsc->fscache = NULL;
104 }
105 kfree(objp: name);
106 return err;
107}
108
109void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
110{
111 fscache_relinquish_volume(volume: fsc->fscache, NULL, invalidate: false);
112}
113

source code of linux/fs/ceph/cache.c