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, 1940452ffcSHuang 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 5840452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 5940452ffcSHuang Jianan EROFS_ATTR_RW_UI(sync_decompress, erofs_mount_opts); 6040452ffcSHuang Jianan #endif 6140452ffcSHuang Jianan 62168e9a76SHuang Jianan static struct attribute *erofs_attrs[] = { 6340452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 6440452ffcSHuang Jianan ATTR_LIST(sync_decompress), 6540452ffcSHuang 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); 78ab92184fSYue Hu EROFS_ATTR_FEATURE(ztailpacking); 79*b15b2e30SYue Hu EROFS_ATTR_FEATURE(fragments); 80168e9a76SHuang Jianan 81168e9a76SHuang Jianan static struct attribute *erofs_feat_attrs[] = { 82168e9a76SHuang Jianan ATTR_LIST(zero_padding), 83168e9a76SHuang Jianan ATTR_LIST(compr_cfgs), 84168e9a76SHuang Jianan ATTR_LIST(big_pcluster), 85168e9a76SHuang Jianan ATTR_LIST(chunked_file), 86168e9a76SHuang Jianan ATTR_LIST(device_table), 87168e9a76SHuang Jianan ATTR_LIST(compr_head2), 88168e9a76SHuang Jianan ATTR_LIST(sb_chksum), 89ab92184fSYue Hu ATTR_LIST(ztailpacking), 90*b15b2e30SYue Hu ATTR_LIST(fragments), 91168e9a76SHuang Jianan NULL, 92168e9a76SHuang Jianan }; 93168e9a76SHuang Jianan ATTRIBUTE_GROUPS(erofs_feat); 94168e9a76SHuang Jianan 95168e9a76SHuang Jianan static unsigned char *__struct_ptr(struct erofs_sb_info *sbi, 96168e9a76SHuang Jianan int struct_type, int offset) 97168e9a76SHuang Jianan { 98168e9a76SHuang Jianan if (struct_type == struct_erofs_sb_info) 99168e9a76SHuang Jianan return (unsigned char *)sbi + offset; 10040452ffcSHuang Jianan if (struct_type == struct_erofs_mount_opts) 10140452ffcSHuang Jianan return (unsigned char *)&sbi->opt + offset; 102168e9a76SHuang Jianan return NULL; 103168e9a76SHuang Jianan } 104168e9a76SHuang Jianan 105168e9a76SHuang Jianan static ssize_t erofs_attr_show(struct kobject *kobj, 106168e9a76SHuang Jianan struct attribute *attr, char *buf) 107168e9a76SHuang Jianan { 108168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 109168e9a76SHuang Jianan s_kobj); 110168e9a76SHuang Jianan struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 111168e9a76SHuang Jianan unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 112168e9a76SHuang Jianan 113168e9a76SHuang Jianan switch (a->attr_id) { 114168e9a76SHuang Jianan case attr_feature: 115168e9a76SHuang Jianan return sysfs_emit(buf, "supported\n"); 116168e9a76SHuang Jianan case attr_pointer_ui: 117168e9a76SHuang Jianan if (!ptr) 118168e9a76SHuang Jianan return 0; 119168e9a76SHuang Jianan return sysfs_emit(buf, "%u\n", *(unsigned int *)ptr); 120168e9a76SHuang Jianan case attr_pointer_bool: 121168e9a76SHuang Jianan if (!ptr) 122168e9a76SHuang Jianan return 0; 123168e9a76SHuang Jianan return sysfs_emit(buf, "%d\n", *(bool *)ptr); 124168e9a76SHuang Jianan } 125168e9a76SHuang Jianan return 0; 126168e9a76SHuang Jianan } 127168e9a76SHuang Jianan 128168e9a76SHuang Jianan static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr, 129168e9a76SHuang Jianan const char *buf, size_t len) 130168e9a76SHuang Jianan { 131168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 132168e9a76SHuang Jianan s_kobj); 133168e9a76SHuang Jianan struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 134168e9a76SHuang Jianan unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 135168e9a76SHuang Jianan unsigned long t; 136168e9a76SHuang Jianan int ret; 137168e9a76SHuang Jianan 138168e9a76SHuang Jianan switch (a->attr_id) { 139168e9a76SHuang Jianan case attr_pointer_ui: 140168e9a76SHuang Jianan if (!ptr) 141168e9a76SHuang Jianan return 0; 142168e9a76SHuang Jianan ret = kstrtoul(skip_spaces(buf), 0, &t); 143168e9a76SHuang Jianan if (ret) 144168e9a76SHuang Jianan return ret; 145168e9a76SHuang Jianan if (t != (unsigned int)t) 146168e9a76SHuang Jianan return -ERANGE; 14740452ffcSHuang Jianan #ifdef CONFIG_EROFS_FS_ZIP 14840452ffcSHuang Jianan if (!strcmp(a->attr.name, "sync_decompress") && 14940452ffcSHuang Jianan (t > EROFS_SYNC_DECOMPRESS_FORCE_OFF)) 15040452ffcSHuang Jianan return -EINVAL; 15140452ffcSHuang Jianan #endif 152168e9a76SHuang Jianan *(unsigned int *)ptr = t; 153168e9a76SHuang Jianan return len; 154168e9a76SHuang Jianan case attr_pointer_bool: 155168e9a76SHuang Jianan if (!ptr) 156168e9a76SHuang Jianan return 0; 157168e9a76SHuang Jianan ret = kstrtoul(skip_spaces(buf), 0, &t); 158168e9a76SHuang Jianan if (ret) 159168e9a76SHuang Jianan return ret; 160168e9a76SHuang Jianan if (t != 0 && t != 1) 161168e9a76SHuang Jianan return -EINVAL; 162168e9a76SHuang Jianan *(bool *)ptr = !!t; 163168e9a76SHuang Jianan return len; 164168e9a76SHuang Jianan } 165168e9a76SHuang Jianan return 0; 166168e9a76SHuang Jianan } 167168e9a76SHuang Jianan 168168e9a76SHuang Jianan static void erofs_sb_release(struct kobject *kobj) 169168e9a76SHuang Jianan { 170168e9a76SHuang Jianan struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 171168e9a76SHuang Jianan s_kobj); 172168e9a76SHuang Jianan complete(&sbi->s_kobj_unregister); 173168e9a76SHuang Jianan } 174168e9a76SHuang Jianan 175168e9a76SHuang Jianan static const struct sysfs_ops erofs_attr_ops = { 176168e9a76SHuang Jianan .show = erofs_attr_show, 177168e9a76SHuang Jianan .store = erofs_attr_store, 178168e9a76SHuang Jianan }; 179168e9a76SHuang Jianan 180168e9a76SHuang Jianan static struct kobj_type erofs_sb_ktype = { 181168e9a76SHuang Jianan .default_groups = erofs_groups, 182168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 183168e9a76SHuang Jianan .release = erofs_sb_release, 184168e9a76SHuang Jianan }; 185168e9a76SHuang Jianan 186168e9a76SHuang Jianan static struct kobj_type erofs_ktype = { 187168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 188168e9a76SHuang Jianan }; 189168e9a76SHuang Jianan 190168e9a76SHuang Jianan static struct kset erofs_root = { 191168e9a76SHuang Jianan .kobj = {.ktype = &erofs_ktype}, 192168e9a76SHuang Jianan }; 193168e9a76SHuang Jianan 194168e9a76SHuang Jianan static struct kobj_type erofs_feat_ktype = { 195168e9a76SHuang Jianan .default_groups = erofs_feat_groups, 196168e9a76SHuang Jianan .sysfs_ops = &erofs_attr_ops, 197168e9a76SHuang Jianan }; 198168e9a76SHuang Jianan 199168e9a76SHuang Jianan static struct kobject erofs_feat = { 200168e9a76SHuang Jianan .kset = &erofs_root, 201168e9a76SHuang Jianan }; 202168e9a76SHuang Jianan 203168e9a76SHuang Jianan int erofs_register_sysfs(struct super_block *sb) 204168e9a76SHuang Jianan { 205168e9a76SHuang Jianan struct erofs_sb_info *sbi = EROFS_SB(sb); 2062ef16441SJia Zhu char *name; 2072ef16441SJia Zhu char *str = NULL; 208168e9a76SHuang Jianan int err; 209168e9a76SHuang Jianan 2102ef16441SJia Zhu if (erofs_is_fscache_mode(sb)) { 2112ef16441SJia Zhu if (sbi->opt.domain_id) { 2122ef16441SJia Zhu str = kasprintf(GFP_KERNEL, "%s,%s", sbi->opt.domain_id, 2132ef16441SJia Zhu sbi->opt.fsid); 2142ef16441SJia Zhu if (!str) 2152ef16441SJia Zhu return -ENOMEM; 2162ef16441SJia Zhu name = str; 2172ef16441SJia Zhu } else { 2182ef16441SJia Zhu name = sbi->opt.fsid; 2192ef16441SJia Zhu } 2202ef16441SJia Zhu } else { 2212ef16441SJia Zhu name = sb->s_id; 2222ef16441SJia Zhu } 223168e9a76SHuang Jianan sbi->s_kobj.kset = &erofs_root; 224168e9a76SHuang Jianan init_completion(&sbi->s_kobj_unregister); 2252ef16441SJia Zhu err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s", name); 2262ef16441SJia Zhu kfree(str); 227168e9a76SHuang Jianan if (err) 228168e9a76SHuang Jianan goto put_sb_kobj; 229168e9a76SHuang Jianan return 0; 230168e9a76SHuang Jianan 231168e9a76SHuang Jianan put_sb_kobj: 232168e9a76SHuang Jianan kobject_put(&sbi->s_kobj); 233168e9a76SHuang Jianan wait_for_completion(&sbi->s_kobj_unregister); 234168e9a76SHuang Jianan return err; 235168e9a76SHuang Jianan } 236168e9a76SHuang Jianan 237168e9a76SHuang Jianan void erofs_unregister_sysfs(struct super_block *sb) 238168e9a76SHuang Jianan { 239168e9a76SHuang Jianan struct erofs_sb_info *sbi = EROFS_SB(sb); 240168e9a76SHuang Jianan 241a942da24SDongliang Mu if (sbi->s_kobj.state_in_sysfs) { 242168e9a76SHuang Jianan kobject_del(&sbi->s_kobj); 243168e9a76SHuang Jianan kobject_put(&sbi->s_kobj); 244168e9a76SHuang Jianan wait_for_completion(&sbi->s_kobj_unregister); 245168e9a76SHuang Jianan } 246a942da24SDongliang Mu } 247168e9a76SHuang Jianan 248168e9a76SHuang Jianan int __init erofs_init_sysfs(void) 249168e9a76SHuang Jianan { 250168e9a76SHuang Jianan int ret; 251168e9a76SHuang Jianan 252168e9a76SHuang Jianan kobject_set_name(&erofs_root.kobj, "erofs"); 253168e9a76SHuang Jianan erofs_root.kobj.parent = fs_kobj; 254168e9a76SHuang Jianan ret = kset_register(&erofs_root); 255168e9a76SHuang Jianan if (ret) 256168e9a76SHuang Jianan goto root_err; 257168e9a76SHuang Jianan 258168e9a76SHuang Jianan ret = kobject_init_and_add(&erofs_feat, &erofs_feat_ktype, 259168e9a76SHuang Jianan NULL, "features"); 260168e9a76SHuang Jianan if (ret) 261168e9a76SHuang Jianan goto feat_err; 262168e9a76SHuang Jianan return ret; 263168e9a76SHuang Jianan 264168e9a76SHuang Jianan feat_err: 265168e9a76SHuang Jianan kobject_put(&erofs_feat); 266168e9a76SHuang Jianan kset_unregister(&erofs_root); 267168e9a76SHuang Jianan root_err: 268168e9a76SHuang Jianan return ret; 269168e9a76SHuang Jianan } 270168e9a76SHuang Jianan 271168e9a76SHuang Jianan void erofs_exit_sysfs(void) 272168e9a76SHuang Jianan { 273168e9a76SHuang Jianan kobject_put(&erofs_feat); 274168e9a76SHuang Jianan kset_unregister(&erofs_root); 275168e9a76SHuang Jianan } 276