1168e9a76SHuang Jianan // SPDX-License-Identifier: GPL-2.0-or-later 2168e9a76SHuang Jianan /* 3168e9a76SHuang Jianan * Copyright (C), 2008-2021, OPPO Mobile Comm Corp., Ltd. 4168e9a76SHuang Jianan * https://www.oppo.com/ 5168e9a76SHuang Jianan */ 6168e9a76SHuang Jianan #include <linux/sysfs.h> 7168e9a76SHuang Jianan #include <linux/kobject.h> 8168e9a76SHuang Jianan 9168e9a76SHuang Jianan #include "internal.h" 10168e9a76SHuang Jianan 11168e9a76SHuang Jianan enum { 12168e9a76SHuang Jianan attr_feature, 13168e9a76SHuang Jianan attr_pointer_ui, 14168e9a76SHuang Jianan attr_pointer_bool, 15168e9a76SHuang Jianan }; 16168e9a76SHuang Jianan 17168e9a76SHuang Jianan enum { 18168e9a76SHuang Jianan struct_erofs_sb_info, 19*40452ffcSHuang Jianan struct_erofs_mount_opts, 20168e9a76SHuang Jianan }; 21168e9a76SHuang Jianan 22168e9a76SHuang Jianan struct erofs_attr { 23168e9a76SHuang Jianan struct attribute attr; 24168e9a76SHuang Jianan short attr_id; 25168e9a76SHuang Jianan int struct_type, offset; 26168e9a76SHuang Jianan }; 27168e9a76SHuang Jianan 28168e9a76SHuang Jianan #define EROFS_ATTR(_name, _mode, _id) \ 29168e9a76SHuang Jianan static struct erofs_attr erofs_attr_##_name = { \ 30168e9a76SHuang Jianan .attr = {.name = __stringify(_name), .mode = _mode }, \ 31168e9a76SHuang Jianan .attr_id = attr_##_id, \ 32168e9a76SHuang Jianan } 33168e9a76SHuang Jianan #define EROFS_ATTR_FUNC(_name, _mode) EROFS_ATTR(_name, _mode, _name) 34168e9a76SHuang Jianan #define EROFS_ATTR_FEATURE(_name) EROFS_ATTR(_name, 0444, feature) 35168e9a76SHuang Jianan 36168e9a76SHuang Jianan #define EROFS_ATTR_OFFSET(_name, _mode, _id, _struct) \ 37168e9a76SHuang Jianan static struct erofs_attr erofs_attr_##_name = { \ 38168e9a76SHuang Jianan .attr = {.name = __stringify(_name), .mode = _mode }, \ 39168e9a76SHuang Jianan .attr_id = attr_##_id, \ 40168e9a76SHuang Jianan .struct_type = struct_##_struct, \ 41168e9a76SHuang Jianan .offset = offsetof(struct _struct, _name),\ 42168e9a76SHuang Jianan } 43168e9a76SHuang Jianan 44168e9a76SHuang Jianan #define EROFS_ATTR_RW(_name, _id, _struct) \ 45168e9a76SHuang Jianan EROFS_ATTR_OFFSET(_name, 0644, _id, _struct) 46168e9a76SHuang Jianan 47168e9a76SHuang Jianan #define EROFS_RO_ATTR(_name, _id, _struct) \ 48168e9a76SHuang Jianan EROFS_ATTR_OFFSET(_name, 0444, _id, _struct) 49168e9a76SHuang Jianan 50168e9a76SHuang Jianan #define EROFS_ATTR_RW_UI(_name, _struct) \ 51168e9a76SHuang Jianan EROFS_ATTR_RW(_name, pointer_ui, _struct) 52168e9a76SHuang Jianan 53168e9a76SHuang Jianan #define EROFS_ATTR_RW_BOOL(_name, _struct) \ 54168e9a76SHuang Jianan EROFS_ATTR_RW(_name, pointer_bool, _struct) 55168e9a76SHuang Jianan 56168e9a76SHuang Jianan #define ATTR_LIST(name) (&erofs_attr_##name.attr) 57168e9a76SHuang Jianan 58*40452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 59*40452ffcSHuang Jianan EROFS_ATTR_RW_UI(sync_decompress, erofs_mount_opts); 60*40452ffcSHuang Jianan #endif 61*40452ffcSHuang Jianan 62168e9a76SHuang Jianan static struct attribute *erofs_attrs[] = { 63*40452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 64*40452ffcSHuang Jianan ATTR_LIST(sync_decompress), 65*40452ffcSHuang Jianan #endif 66168e9a76SHuang Jianan NULL, 67168e9a76SHuang Jianan }; 68168e9a76SHuang Jianan ATTRIBUTE_GROUPS(erofs); 69168e9a76SHuang Jianan 70168e9a76SHuang Jianan /* Features this copy of erofs supports */ 71168e9a76SHuang Jianan EROFS_ATTR_FEATURE(zero_padding); 72168e9a76SHuang Jianan EROFS_ATTR_FEATURE(compr_cfgs); 73168e9a76SHuang Jianan EROFS_ATTR_FEATURE(big_pcluster); 74168e9a76SHuang Jianan EROFS_ATTR_FEATURE(chunked_file); 75168e9a76SHuang Jianan EROFS_ATTR_FEATURE(device_table); 76168e9a76SHuang Jianan EROFS_ATTR_FEATURE(compr_head2); 77168e9a76SHuang Jianan EROFS_ATTR_FEATURE(sb_chksum); 78168e9a76SHuang Jianan 79168e9a76SHuang Jianan static struct attribute *erofs_feat_attrs[] = { 80168e9a76SHuang Jianan ATTR_LIST(zero_padding), 81168e9a76SHuang Jianan ATTR_LIST(compr_cfgs), 82168e9a76SHuang Jianan ATTR_LIST(big_pcluster), 83168e9a76SHuang Jianan ATTR_LIST(chunked_file), 84168e9a76SHuang Jianan ATTR_LIST(device_table), 85168e9a76SHuang Jianan ATTR_LIST(compr_head2), 86168e9a76SHuang Jianan ATTR_LIST(sb_chksum), 87168e9a76SHuang Jianan NULL, 88168e9a76SHuang Jianan }; 89168e9a76SHuang Jianan ATTRIBUTE_GROUPS(erofs_feat); 90168e9a76SHuang Jianan 91168e9a76SHuang Jianan static unsigned char *__struct_ptr(struct erofs_sb_info *sbi, 92168e9a76SHuang Jianan int struct_type, int offset) 93168e9a76SHuang Jianan { 94168e9a76SHuang Jianan if (struct_type == struct_erofs_sb_info) 95168e9a76SHuang Jianan return (unsigned char *)sbi + offset; 96*40452ffcSHuang Jianan if (struct_type == struct_erofs_mount_opts) 97*40452ffcSHuang Jianan return (unsigned char *)&sbi->opt + offset; 98168e9a76SHuang Jianan return NULL; 99168e9a76SHuang Jianan } 100168e9a76SHuang Jianan 101168e9a76SHuang Jianan static ssize_t erofs_attr_show(struct kobject *kobj, 102168e9a76SHuang Jianan struct attribute *attr, char *buf) 103168e9a76SHuang Jianan { 104168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 105168e9a76SHuang Jianan s_kobj); 106168e9a76SHuang Jianan struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 107168e9a76SHuang Jianan unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 108168e9a76SHuang Jianan 109168e9a76SHuang Jianan switch (a->attr_id) { 110168e9a76SHuang Jianan case attr_feature: 111168e9a76SHuang Jianan return sysfs_emit(buf, "supported\n"); 112168e9a76SHuang Jianan case attr_pointer_ui: 113168e9a76SHuang Jianan if (!ptr) 114168e9a76SHuang Jianan return 0; 115168e9a76SHuang Jianan return sysfs_emit(buf, "%u\n", *(unsigned int *)ptr); 116168e9a76SHuang Jianan case attr_pointer_bool: 117168e9a76SHuang Jianan if (!ptr) 118168e9a76SHuang Jianan return 0; 119168e9a76SHuang Jianan return sysfs_emit(buf, "%d\n", *(bool *)ptr); 120168e9a76SHuang Jianan } 121168e9a76SHuang Jianan return 0; 122168e9a76SHuang Jianan } 123168e9a76SHuang Jianan 124168e9a76SHuang Jianan static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr, 125168e9a76SHuang Jianan const char *buf, size_t len) 126168e9a76SHuang Jianan { 127168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 128168e9a76SHuang Jianan s_kobj); 129168e9a76SHuang Jianan struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 130168e9a76SHuang Jianan unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 131168e9a76SHuang Jianan unsigned long t; 132168e9a76SHuang Jianan int ret; 133168e9a76SHuang Jianan 134168e9a76SHuang Jianan switch (a->attr_id) { 135168e9a76SHuang Jianan case attr_pointer_ui: 136168e9a76SHuang Jianan if (!ptr) 137168e9a76SHuang Jianan return 0; 138168e9a76SHuang Jianan ret = kstrtoul(skip_spaces(buf), 0, &t); 139168e9a76SHuang Jianan if (ret) 140168e9a76SHuang Jianan return ret; 141168e9a76SHuang Jianan if (t != (unsigned int)t) 142168e9a76SHuang Jianan return -ERANGE; 143*40452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 144*40452ffcSHuang Jianan if (!strcmp(a->attr.name, "sync_decompress") && 145*40452ffcSHuang Jianan (t > EROFS_SYNC_DECOMPRESS_FORCE_OFF)) 146*40452ffcSHuang Jianan return -EINVAL; 147*40452ffcSHuang Jianan #endif 148168e9a76SHuang Jianan *(unsigned int *)ptr = t; 149168e9a76SHuang Jianan return len; 150168e9a76SHuang Jianan case attr_pointer_bool: 151168e9a76SHuang Jianan if (!ptr) 152168e9a76SHuang Jianan return 0; 153168e9a76SHuang Jianan ret = kstrtoul(skip_spaces(buf), 0, &t); 154168e9a76SHuang Jianan if (ret) 155168e9a76SHuang Jianan return ret; 156168e9a76SHuang Jianan if (t != 0 && t != 1) 157168e9a76SHuang Jianan return -EINVAL; 158168e9a76SHuang Jianan *(bool *)ptr = !!t; 159168e9a76SHuang Jianan return len; 160168e9a76SHuang Jianan } 161168e9a76SHuang Jianan return 0; 162168e9a76SHuang Jianan } 163168e9a76SHuang Jianan 164168e9a76SHuang Jianan static void erofs_sb_release(struct kobject *kobj) 165168e9a76SHuang Jianan { 166168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 167168e9a76SHuang Jianan s_kobj); 168168e9a76SHuang Jianan complete(&sbi->s_kobj_unregister); 169168e9a76SHuang Jianan } 170168e9a76SHuang Jianan 171168e9a76SHuang Jianan static const struct sysfs_ops erofs_attr_ops = { 172168e9a76SHuang Jianan .show = erofs_attr_show, 173168e9a76SHuang Jianan .store = erofs_attr_store, 174168e9a76SHuang Jianan }; 175168e9a76SHuang Jianan 176168e9a76SHuang Jianan static struct kobj_type erofs_sb_ktype = { 177168e9a76SHuang Jianan .default_groups = erofs_groups, 178168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 179168e9a76SHuang Jianan .release = erofs_sb_release, 180168e9a76SHuang Jianan }; 181168e9a76SHuang Jianan 182168e9a76SHuang Jianan static struct kobj_type erofs_ktype = { 183168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 184168e9a76SHuang Jianan }; 185168e9a76SHuang Jianan 186168e9a76SHuang Jianan static struct kset erofs_root = { 187168e9a76SHuang Jianan .kobj = {.ktype = &erofs_ktype}, 188168e9a76SHuang Jianan }; 189168e9a76SHuang Jianan 190168e9a76SHuang Jianan static struct kobj_type erofs_feat_ktype = { 191168e9a76SHuang Jianan .default_groups = erofs_feat_groups, 192168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 193168e9a76SHuang Jianan }; 194168e9a76SHuang Jianan 195168e9a76SHuang Jianan static struct kobject erofs_feat = { 196168e9a76SHuang Jianan .kset = &erofs_root, 197168e9a76SHuang Jianan }; 198168e9a76SHuang Jianan 199168e9a76SHuang Jianan int erofs_register_sysfs(struct super_block *sb) 200168e9a76SHuang Jianan { 201168e9a76SHuang Jianan struct erofs_sb_info *sbi = EROFS_SB(sb); 202168e9a76SHuang Jianan int err; 203168e9a76SHuang Jianan 204168e9a76SHuang Jianan sbi->s_kobj.kset = &erofs_root; 205168e9a76SHuang Jianan init_completion(&sbi->s_kobj_unregister); 206168e9a76SHuang Jianan err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, 207168e9a76SHuang Jianan "%s", sb->s_id); 208168e9a76SHuang Jianan if (err) 209168e9a76SHuang Jianan goto put_sb_kobj; 210168e9a76SHuang Jianan return 0; 211168e9a76SHuang Jianan 212168e9a76SHuang Jianan put_sb_kobj: 213168e9a76SHuang Jianan kobject_put(&sbi->s_kobj); 214168e9a76SHuang Jianan wait_for_completion(&sbi->s_kobj_unregister); 215168e9a76SHuang Jianan return err; 216168e9a76SHuang Jianan } 217168e9a76SHuang Jianan 218168e9a76SHuang Jianan void erofs_unregister_sysfs(struct super_block *sb) 219168e9a76SHuang Jianan { 220168e9a76SHuang Jianan struct erofs_sb_info *sbi = EROFS_SB(sb); 221168e9a76SHuang Jianan 222168e9a76SHuang Jianan kobject_del(&sbi->s_kobj); 223168e9a76SHuang Jianan kobject_put(&sbi->s_kobj); 224168e9a76SHuang Jianan wait_for_completion(&sbi->s_kobj_unregister); 225168e9a76SHuang Jianan } 226168e9a76SHuang Jianan 227168e9a76SHuang Jianan int __init erofs_init_sysfs(void) 228168e9a76SHuang Jianan { 229168e9a76SHuang Jianan int ret; 230168e9a76SHuang Jianan 231168e9a76SHuang Jianan kobject_set_name(&erofs_root.kobj, "erofs"); 232168e9a76SHuang Jianan erofs_root.kobj.parent = fs_kobj; 233168e9a76SHuang Jianan ret = kset_register(&erofs_root); 234168e9a76SHuang Jianan if (ret) 235168e9a76SHuang Jianan goto root_err; 236168e9a76SHuang Jianan 237168e9a76SHuang Jianan ret = kobject_init_and_add(&erofs_feat, &erofs_feat_ktype, 238168e9a76SHuang Jianan NULL, "features"); 239168e9a76SHuang Jianan if (ret) 240168e9a76SHuang Jianan goto feat_err; 241168e9a76SHuang Jianan return ret; 242168e9a76SHuang Jianan 243168e9a76SHuang Jianan feat_err: 244168e9a76SHuang Jianan kobject_put(&erofs_feat); 245168e9a76SHuang Jianan kset_unregister(&erofs_root); 246168e9a76SHuang Jianan root_err: 247168e9a76SHuang Jianan return ret; 248168e9a76SHuang Jianan } 249168e9a76SHuang Jianan 250168e9a76SHuang Jianan void erofs_exit_sysfs(void) 251168e9a76SHuang Jianan { 252168e9a76SHuang Jianan kobject_put(&erofs_feat); 253168e9a76SHuang Jianan kset_unregister(&erofs_root); 254168e9a76SHuang Jianan } 255