1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C), 2008-2021, OPPO Mobile Comm Corp., Ltd.
4 * https://www.oppo.com/
6 #include <linux/sysfs.h>
7 #include <linux/kobject.h>
19 struct_erofs_mount_opts
,
23 struct attribute attr
;
25 int struct_type
, offset
;
28 #define EROFS_ATTR(_name, _mode, _id) \
29 static struct erofs_attr erofs_attr_##_name = { \
30 .attr = {.name = __stringify(_name), .mode = _mode }, \
31 .attr_id = attr_##_id, \
33 #define EROFS_ATTR_FUNC(_name, _mode) EROFS_ATTR(_name, _mode, _name)
34 #define EROFS_ATTR_FEATURE(_name) EROFS_ATTR(_name, 0444, feature)
36 #define EROFS_ATTR_OFFSET(_name, _mode, _id, _struct) \
37 static struct erofs_attr erofs_attr_##_name = { \
38 .attr = {.name = __stringify(_name), .mode = _mode }, \
39 .attr_id = attr_##_id, \
40 .struct_type = struct_##_struct, \
41 .offset = offsetof(struct _struct, _name),\
44 #define EROFS_ATTR_RW(_name, _id, _struct) \
45 EROFS_ATTR_OFFSET(_name, 0644, _id, _struct)
47 #define EROFS_RO_ATTR(_name, _id, _struct) \
48 EROFS_ATTR_OFFSET(_name, 0444, _id, _struct)
50 #define EROFS_ATTR_RW_UI(_name, _struct) \
51 EROFS_ATTR_RW(_name, pointer_ui, _struct)
53 #define EROFS_ATTR_RW_BOOL(_name, _struct) \
54 EROFS_ATTR_RW(_name, pointer_bool, _struct)
56 #define ATTR_LIST(name) (&erofs_attr_##name.attr)
58 #ifdef CONFIG_EROFS_FS_ZIP
59 EROFS_ATTR_RW_UI(sync_decompress
, erofs_mount_opts
);
62 static struct attribute
*erofs_attrs
[] = {
63 #ifdef CONFIG_EROFS_FS_ZIP
64 ATTR_LIST(sync_decompress
),
68 ATTRIBUTE_GROUPS(erofs
);
70 /* Features this copy of erofs supports */
71 EROFS_ATTR_FEATURE(zero_padding
);
72 EROFS_ATTR_FEATURE(compr_cfgs
);
73 EROFS_ATTR_FEATURE(big_pcluster
);
74 EROFS_ATTR_FEATURE(chunked_file
);
75 EROFS_ATTR_FEATURE(device_table
);
76 EROFS_ATTR_FEATURE(compr_head2
);
77 EROFS_ATTR_FEATURE(sb_chksum
);
78 EROFS_ATTR_FEATURE(ztailpacking
);
79 EROFS_ATTR_FEATURE(fragments
);
80 EROFS_ATTR_FEATURE(dedupe
);
82 static struct attribute
*erofs_feat_attrs
[] = {
83 ATTR_LIST(zero_padding
),
84 ATTR_LIST(compr_cfgs
),
85 ATTR_LIST(big_pcluster
),
86 ATTR_LIST(chunked_file
),
87 ATTR_LIST(device_table
),
88 ATTR_LIST(compr_head2
),
90 ATTR_LIST(ztailpacking
),
95 ATTRIBUTE_GROUPS(erofs_feat
);
97 static unsigned char *__struct_ptr(struct erofs_sb_info
*sbi
,
98 int struct_type
, int offset
)
100 if (struct_type
== struct_erofs_sb_info
)
101 return (unsigned char *)sbi
+ offset
;
102 if (struct_type
== struct_erofs_mount_opts
)
103 return (unsigned char *)&sbi
->opt
+ offset
;
107 static ssize_t
erofs_attr_show(struct kobject
*kobj
,
108 struct attribute
*attr
, char *buf
)
110 struct erofs_sb_info
*sbi
= container_of(kobj
, struct erofs_sb_info
,
112 struct erofs_attr
*a
= container_of(attr
, struct erofs_attr
, attr
);
113 unsigned char *ptr
= __struct_ptr(sbi
, a
->struct_type
, a
->offset
);
115 switch (a
->attr_id
) {
117 return sysfs_emit(buf
, "supported\n");
118 case attr_pointer_ui
:
121 return sysfs_emit(buf
, "%u\n", *(unsigned int *)ptr
);
122 case attr_pointer_bool
:
125 return sysfs_emit(buf
, "%d\n", *(bool *)ptr
);
130 static ssize_t
erofs_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
131 const char *buf
, size_t len
)
133 struct erofs_sb_info
*sbi
= container_of(kobj
, struct erofs_sb_info
,
135 struct erofs_attr
*a
= container_of(attr
, struct erofs_attr
, attr
);
136 unsigned char *ptr
= __struct_ptr(sbi
, a
->struct_type
, a
->offset
);
140 switch (a
->attr_id
) {
141 case attr_pointer_ui
:
144 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
147 if (t
!= (unsigned int)t
)
149 #ifdef CONFIG_EROFS_FS_ZIP
150 if (!strcmp(a
->attr
.name
, "sync_decompress") &&
151 (t
> EROFS_SYNC_DECOMPRESS_FORCE_OFF
))
154 *(unsigned int *)ptr
= t
;
156 case attr_pointer_bool
:
159 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
162 if (t
!= 0 && t
!= 1)
170 static void erofs_sb_release(struct kobject
*kobj
)
172 struct erofs_sb_info
*sbi
= container_of(kobj
, struct erofs_sb_info
,
174 complete(&sbi
->s_kobj_unregister
);
177 static const struct sysfs_ops erofs_attr_ops
= {
178 .show
= erofs_attr_show
,
179 .store
= erofs_attr_store
,
182 static struct kobj_type erofs_sb_ktype
= {
183 .default_groups
= erofs_groups
,
184 .sysfs_ops
= &erofs_attr_ops
,
185 .release
= erofs_sb_release
,
188 static struct kobj_type erofs_ktype
= {
189 .sysfs_ops
= &erofs_attr_ops
,
192 static struct kset erofs_root
= {
193 .kobj
= {.ktype
= &erofs_ktype
},
196 static struct kobj_type erofs_feat_ktype
= {
197 .default_groups
= erofs_feat_groups
,
198 .sysfs_ops
= &erofs_attr_ops
,
201 static struct kobject erofs_feat
= {
205 int erofs_register_sysfs(struct super_block
*sb
)
207 struct erofs_sb_info
*sbi
= EROFS_SB(sb
);
212 if (erofs_is_fscache_mode(sb
)) {
213 if (sbi
->domain_id
) {
214 str
= kasprintf(GFP_KERNEL
, "%s,%s", sbi
->domain_id
,
225 sbi
->s_kobj
.kset
= &erofs_root
;
226 init_completion(&sbi
->s_kobj_unregister
);
227 err
= kobject_init_and_add(&sbi
->s_kobj
, &erofs_sb_ktype
, NULL
, "%s", name
);
234 kobject_put(&sbi
->s_kobj
);
235 wait_for_completion(&sbi
->s_kobj_unregister
);
239 void erofs_unregister_sysfs(struct super_block
*sb
)
241 struct erofs_sb_info
*sbi
= EROFS_SB(sb
);
243 if (sbi
->s_kobj
.state_in_sysfs
) {
244 kobject_del(&sbi
->s_kobj
);
245 kobject_put(&sbi
->s_kobj
);
246 wait_for_completion(&sbi
->s_kobj_unregister
);
250 int __init
erofs_init_sysfs(void)
254 kobject_set_name(&erofs_root
.kobj
, "erofs");
255 erofs_root
.kobj
.parent
= fs_kobj
;
256 ret
= kset_register(&erofs_root
);
260 ret
= kobject_init_and_add(&erofs_feat
, &erofs_feat_ktype
,
267 kobject_put(&erofs_feat
);
268 kset_unregister(&erofs_root
);
273 void erofs_exit_sysfs(void)
275 kobject_put(&erofs_feat
);
276 kset_unregister(&erofs_root
);