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
ceph_fscache_register_inode_cookie(struct inode * inode)15 void 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_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 }
40
ceph_fscache_unregister_inode_cookie(struct ceph_inode_info * ci)41 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
42 {
43 fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
44 }
45
ceph_fscache_use_cookie(struct inode * inode,bool will_modify)46 void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
47 {
48 struct ceph_inode_info *ci = ceph_inode(inode);
49
50 fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
51 }
52
ceph_fscache_unuse_cookie(struct inode * inode,bool update)53 void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
54 {
55 struct ceph_inode_info *ci = ceph_inode(inode);
56
57 if (update) {
58 loff_t i_size = i_size_read(inode);
59
60 fscache_unuse_cookie(ceph_fscache_cookie(ci),
61 &ci->i_version, &i_size);
62 } else {
63 fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
64 }
65 }
66
ceph_fscache_update(struct inode * inode)67 void ceph_fscache_update(struct inode *inode)
68 {
69 struct ceph_inode_info *ci = ceph_inode(inode);
70 loff_t i_size = i_size_read(inode);
71
72 fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
73 }
74
ceph_fscache_invalidate(struct inode * inode,bool dio_write)75 void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
76 {
77 struct ceph_inode_info *ci = ceph_inode(inode);
78
79 fscache_invalidate(ceph_fscache_cookie(ci),
80 &ci->i_version, i_size_read(inode),
81 dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
82 }
83
ceph_fscache_register_fs(struct ceph_fs_client * fsc,struct fs_context * fc)84 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
85 {
86 const struct ceph_fsid *fsid = &fsc->client->fsid;
87 const char *fscache_uniq = fsc->mount_options->fscache_uniq;
88 size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
89 char *name;
90 int err = 0;
91
92 name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
93 uniq_len ? fscache_uniq : "");
94 if (!name)
95 return -ENOMEM;
96
97 fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
98 if (IS_ERR_OR_NULL(fsc->fscache)) {
99 errorfc(fc, "Unable to register fscache cookie for %s", name);
100 err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
101 fsc->fscache = NULL;
102 }
103 kfree(name);
104 return err;
105 }
106
ceph_fscache_unregister_fs(struct ceph_fs_client * fsc)107 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
108 {
109 fscache_relinquish_volume(fsc->fscache, NULL, false);
110 }
111
