1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Ceph cache definitions.
*
* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
* Written by Milosz Tanski (milosz@adfin.com)
*/
#include <linux/ceph/ceph_debug.h>
#include <linux/fs_context.h>
#include "super.h"
#include "cache.h"
struct fscache_netfs ceph_cache_netfs = {
.name = "ceph",
.version = 0,
};
static DEFINE_MUTEX(ceph_fscache_lock);
static LIST_HEAD(ceph_fscache_list);
struct ceph_fscache_entry {
struct list_head list;
struct fscache_cookie *fscache;
size_t uniq_len;
/* The following members must be last */
struct ceph_fsid fsid;
char uniquifier[];
};
static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
.name = "CEPH.fsid",
.type = FSCACHE_COOKIE_TYPE_INDEX,
};
int __init ceph_fscache_register(void)
{
return fscache_register_netfs(&ceph_cache_netfs);
}
void ceph_fscache_unregister(void)
{
fscache_unregister_netfs(&ceph_cache_netfs);
}
int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
{
const struct ceph_fsid *fsid = &fsc->client->fsid;
const char *fscache_uniq = fsc->mount_options->fscache_uniq;
size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
struct ceph_fscache_entry *ent;
int err = 0;
mutex_lock(&ceph_fscache_lock);
list_for_each_entry(ent, &ceph_fscache_list, list) {
if (memcmp(&ent->fsid, fsid, sizeof(*fsid)))
continue;
if (ent->uniq_len != uniq_len)
continue;
if (uniq_len && memcmp(ent->uniquifier, fscache_uniq, uniq_len))
continue;
errorfc(fc, "fscache cookie already registered for fsid %pU, use fsc=<uniquifier> option",
fsid);
err = -EBUSY;
goto out_unlock;
}
ent = kzalloc(sizeof(*ent) + uniq_len, GFP_KERNEL);
if (!ent) {
err = -ENOMEM;
goto out_unlock;
}
memcpy(&ent->fsid, fsid, sizeof(*fsid));
if (uniq_len > 0) {
memcpy(&ent->uniquifier, fscache_uniq, uniq_len);
ent->uniq_len = uniq_len;
}
fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
&ceph_fscache_fsid_object_def,
&ent->fsid, sizeof(ent->fsid) + uniq_len,
NULL, 0,
fsc, 0, true);
if (fsc->fscache) {
ent->fscache = fsc->fscache;
list_add_tail(&ent->list, &ceph_fscache_list);
} else {
kfree(ent);
errorfc(fc, "unable to register fscache cookie for fsid %pU",
fsid);
/* all other fs ignore this error */
}
out_unlock:
mutex_unlock(&ceph_fscache_lock);
return err;
}
static enum fscache_checkaux ceph_fscache_inode_check_aux(
void *cookie_netfs_data, const void *data, uint16_t dlen,
loff_t object_size)
{
struct ceph_inode_info* ci = cookie_netfs_data;
struct inode* inode = &ci->vfs_inode;
if (dlen != sizeof(ci->i_version) ||
i_size_read(inode) != object_size)
return FSCACHE_CHECKAUX_OBSOLETE;
if (*(u64 *)data != ci->i_version)
return FSCACHE_CHECKAUX_OBSOLETE;
dout("ceph inode 0x%p cached okay\n", ci);
return FSCACHE_CHECKAUX_OKAY;
}
static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
.name = "CEPH.inode",
.type = FSCACHE_COOKIE_TYPE_DATAFILE,
.check_aux = ceph_fscache_inode_check_aux,
};
void ceph_fscache_register_inode_cookie(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
/* No caching for filesystem */
if (!fsc->fscache)
return;
/* Only cache for regular files that are read only */
if (!S_ISREG(inode->i_mode))
return;
inode_lock_nested(inode, I_MUTEX_CHILD);
if (!ci->fscache) {
ci->fscache = fscache_acquire_cookie(fsc->fscache,
&ceph_fscache_inode_object_def,
&ci->i_vino, sizeof(ci->i_vino),
&ci->i_version, sizeof(ci->i_version),
ci, i_size_read(inode), false);
}
inode_unlock(inode);
}
void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
{
struct fscache_cookie* cookie;
if ((cookie = ci->fscache) == NULL)
return;
ci->fscache = NULL;
fscache_relinquish_cookie(cookie, &ci->i_vino, false);
}
static bool ceph_fscache_can_enable(void *data)
{
struct inode *inode = data;
return !inode_is_open_for_write(inode);
}
void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp)
{
struct ceph_inode_info *ci = ceph_inode(inode);
if (!fscache_cookie_valid(ci->fscache))
return;
if (inode_is_open_for_write(inode)) {
dout("fscache_file_set_cookie %p %p disabling cache\n",
inode, filp);
fscache_disable_cookie(ci->fscache, &ci->i_vino, false);
} else {
fscache_enable_cookie(ci->fscache, &ci->i_vino, i_size_read(inode),
ceph_fscache_can_enable, inode);
if (fscache_cookie_enabled(ci->fscache)) {
dout("fscache_file_set_cookie %p %p enabling cache\n",
inode, filp);
}
}
}
void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
if (fscache_cookie_valid(fsc->fscache)) {
struct ceph_fscache_entry *ent;
bool found = false;
mutex_lock(&ceph_fscache_lock);
list_for_each_entry(ent, &ceph_fscache_list, list) {
if (ent->fscache == fsc->fscache) {
list_del(&ent->list);
kfree(ent);
found = true;
break;
}
}
WARN_ON_ONCE(!found);
mutex_unlock(&ceph_fscache_lock);
__fscache_relinquish_cookie(fsc->fscache, NULL, false);
}
fsc->fscache = NULL;
}
|
