1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C), 2008-2021, OPPO Mobile Comm Corp., Ltd. 4 * https://www.oppo.com/ 5 */ 6 #include <linux/sysfs.h> 7 #include <linux/kobject.h> 8 9 #include "internal.h" 10 #include "compress.h" 11 12 enum { 13 attr_feature, 14 attr_drop_caches, 15 attr_pointer_ui, 16 attr_pointer_bool, 17 attr_accel, 18 }; 19 20 enum { 21 struct_erofs_sb_info, 22 struct_erofs_mount_opts, 23 }; 24 25 struct erofs_attr { 26 struct attribute attr; 27 short attr_id; 28 int struct_type, offset; 29 }; 30 31 #define EROFS_ATTR(_name, _mode, _id) \ 32 static struct erofs_attr erofs_attr_##_name = { \ 33 .attr = {.name = __stringify(_name), .mode = _mode }, \ 34 .attr_id = attr_##_id, \ 35 } 36 #define EROFS_ATTR_FUNC(_name, _mode) EROFS_ATTR(_name, _mode, _name) 37 #define EROFS_ATTR_FEATURE(_name) EROFS_ATTR(_name, 0444, feature) 38 39 #define EROFS_ATTR_OFFSET(_name, _mode, _id, _struct) \ 40 static struct erofs_attr erofs_attr_##_name = { \ 41 .attr = {.name = __stringify(_name), .mode = _mode }, \ 42 .attr_id = attr_##_id, \ 43 .struct_type = struct_##_struct, \ 44 .offset = offsetof(struct _struct, _name),\ 45 } 46 47 #define EROFS_ATTR_RW(_name, _id, _struct) \ 48 EROFS_ATTR_OFFSET(_name, 0644, _id, _struct) 49 50 #define EROFS_RO_ATTR(_name, _id, _struct) \ 51 EROFS_ATTR_OFFSET(_name, 0444, _id, _struct) 52 53 #define EROFS_ATTR_RW_UI(_name, _struct) \ 54 EROFS_ATTR_RW(_name, pointer_ui, _struct) 55 56 #define EROFS_ATTR_RW_BOOL(_name, _struct) \ 57 EROFS_ATTR_RW(_name, pointer_bool, _struct) 58 59 #define ATTR_LIST(name) (&erofs_attr_##name.attr) 60 61 #ifdef CONFIG_EROFS_FS_ZIP 62 EROFS_ATTR_RW_UI(sync_decompress, erofs_sb_info); 63 EROFS_ATTR_FUNC(drop_caches, 0200); 64 #endif 65 #ifdef CONFIG_EROFS_FS_ZIP_ACCEL 66 EROFS_ATTR_FUNC(accel, 0644); 67 #endif 68 EROFS_ATTR_RW_UI(dir_ra_bytes, erofs_sb_info); 69 70 static struct attribute *erofs_sb_attrs[] = { 71 #ifdef CONFIG_EROFS_FS_ZIP 72 ATTR_LIST(sync_decompress), 73 ATTR_LIST(drop_caches), 74 #endif 75 ATTR_LIST(dir_ra_bytes), 76 NULL, 77 }; 78 ATTRIBUTE_GROUPS(erofs_sb); 79 80 static struct attribute *erofs_attrs[] = { 81 #ifdef CONFIG_EROFS_FS_ZIP_ACCEL 82 ATTR_LIST(accel), 83 #endif 84 NULL, 85 }; 86 ATTRIBUTE_GROUPS(erofs); 87 88 /* Features this copy of erofs supports */ 89 EROFS_ATTR_FEATURE(compr_cfgs); 90 EROFS_ATTR_FEATURE(big_pcluster); 91 EROFS_ATTR_FEATURE(chunked_file); 92 EROFS_ATTR_FEATURE(device_table); 93 EROFS_ATTR_FEATURE(compr_head2); 94 EROFS_ATTR_FEATURE(sb_chksum); 95 EROFS_ATTR_FEATURE(ztailpacking); 96 EROFS_ATTR_FEATURE(fragments); 97 EROFS_ATTR_FEATURE(dedupe); 98 EROFS_ATTR_FEATURE(48bit); 99 EROFS_ATTR_FEATURE(metabox); 100 101 static struct attribute *erofs_feat_attrs[] = { 102 ATTR_LIST(compr_cfgs), 103 ATTR_LIST(big_pcluster), 104 ATTR_LIST(chunked_file), 105 ATTR_LIST(device_table), 106 ATTR_LIST(compr_head2), 107 ATTR_LIST(sb_chksum), 108 ATTR_LIST(ztailpacking), 109 ATTR_LIST(fragments), 110 ATTR_LIST(dedupe), 111 ATTR_LIST(48bit), 112 ATTR_LIST(metabox), 113 NULL, 114 }; 115 ATTRIBUTE_GROUPS(erofs_feat); 116 117 static unsigned char *__struct_ptr(struct erofs_sb_info *sbi, 118 int struct_type, int offset) 119 { 120 if (struct_type == struct_erofs_sb_info) 121 return (unsigned char *)sbi + offset; 122 if (struct_type == struct_erofs_mount_opts) 123 return (unsigned char *)&sbi->opt + offset; 124 return NULL; 125 } 126 127 static ssize_t erofs_attr_show(struct kobject *kobj, 128 struct attribute *attr, char *buf) 129 { 130 struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 131 s_kobj); 132 struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 133 unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 134 135 switch (a->attr_id) { 136 case attr_feature: 137 return sysfs_emit(buf, "supported\n"); 138 case attr_pointer_ui: 139 if (!ptr) 140 return 0; 141 return sysfs_emit(buf, "%u\n", *(unsigned int *)ptr); 142 case attr_pointer_bool: 143 if (!ptr) 144 return 0; 145 return sysfs_emit(buf, "%d\n", *(bool *)ptr); 146 case attr_accel: 147 return z_erofs_crypto_show_engines(buf, PAGE_SIZE, '\n'); 148 } 149 return 0; 150 } 151 152 static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr, 153 const char *buf, size_t len) 154 { 155 struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 156 s_kobj); 157 struct erofs_attr *a = container_of(attr, struct erofs_attr, attr); 158 unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset); 159 unsigned long t; 160 int ret; 161 162 switch (a->attr_id) { 163 case attr_pointer_ui: 164 if (!ptr) 165 return 0; 166 ret = kstrtoul(skip_spaces(buf), 0, &t); 167 if (ret) 168 return ret; 169 if (t != (unsigned int)t) 170 return -ERANGE; 171 if (IS_ENABLED(CONFIG_EROFS_FS_ZIP) && 172 !strcmp(a->attr.name, "sync_decompress") && 173 (t > EROFS_SYNC_DECOMPRESS_FORCE_OFF)) 174 return -EINVAL; 175 *(unsigned int *)ptr = t; 176 return len; 177 case attr_pointer_bool: 178 if (!ptr) 179 return 0; 180 ret = kstrtoul(skip_spaces(buf), 0, &t); 181 if (ret) 182 return ret; 183 if (t != 0 && t != 1) 184 return -EINVAL; 185 *(bool *)ptr = !!t; 186 return len; 187 #ifdef CONFIG_EROFS_FS_ZIP 188 case attr_drop_caches: 189 ret = kstrtoul(skip_spaces(buf), 0, &t); 190 if (ret) 191 return ret; 192 if (t < 1 || t > 3) 193 return -EINVAL; 194 195 if (t & 2) 196 z_erofs_shrink_scan(sbi, ~0UL); 197 if (t & 1) 198 invalidate_mapping_pages(MNGD_MAPPING(sbi), 0, -1); 199 return len; 200 #endif 201 #ifdef CONFIG_EROFS_FS_ZIP_ACCEL 202 case attr_accel: 203 buf = skip_spaces(buf); 204 z_erofs_crypto_disable_all_engines(); 205 while (*buf) { 206 t = strcspn(buf, "\n"); 207 ret = z_erofs_crypto_enable_engine(buf, t); 208 if (ret < 0) 209 return ret; 210 buf += buf[t] != '\0' ? t + 1 : t; 211 } 212 return len; 213 #endif 214 } 215 return 0; 216 } 217 218 static void erofs_sb_release(struct kobject *kobj) 219 { 220 struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info, 221 s_kobj); 222 complete(&sbi->s_kobj_unregister); 223 } 224 225 static const struct sysfs_ops erofs_attr_ops = { 226 .show = erofs_attr_show, 227 .store = erofs_attr_store, 228 }; 229 230 static const struct kobj_type erofs_sb_ktype = { 231 .default_groups = erofs_sb_groups, 232 .sysfs_ops = &erofs_attr_ops, 233 .release = erofs_sb_release, 234 }; 235 236 static const struct kobj_type erofs_ktype = { 237 .default_groups = erofs_groups, 238 .sysfs_ops = &erofs_attr_ops, 239 }; 240 241 static struct kset erofs_root = { 242 .kobj = {.ktype = &erofs_ktype}, 243 }; 244 245 static const struct kobj_type erofs_feat_ktype = { 246 .default_groups = erofs_feat_groups, 247 .sysfs_ops = &erofs_attr_ops, 248 }; 249 250 static struct kobject erofs_feat = { 251 .kset = &erofs_root, 252 }; 253 254 int erofs_register_sysfs(struct super_block *sb) 255 { 256 struct erofs_sb_info *sbi = EROFS_SB(sb); 257 int err; 258 259 sbi->s_kobj.kset = &erofs_root; 260 init_completion(&sbi->s_kobj_unregister); 261 err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s", 262 sb->s_sysfs_name); 263 if (err) { 264 kobject_put(&sbi->s_kobj); 265 wait_for_completion(&sbi->s_kobj_unregister); 266 } 267 return err; 268 } 269 270 void erofs_unregister_sysfs(struct super_block *sb) 271 { 272 struct erofs_sb_info *sbi = EROFS_SB(sb); 273 274 if (sbi->s_kobj.state_in_sysfs) { 275 kobject_del(&sbi->s_kobj); 276 kobject_put(&sbi->s_kobj); 277 wait_for_completion(&sbi->s_kobj_unregister); 278 } 279 } 280 281 void erofs_exit_sysfs(void) 282 { 283 kobject_put(&erofs_feat); 284 kset_unregister(&erofs_root); 285 } 286 287 int __init erofs_init_sysfs(void) 288 { 289 int ret; 290 291 kobject_set_name(&erofs_root.kobj, "erofs"); 292 erofs_root.kobj.parent = fs_kobj; 293 ret = kset_register(&erofs_root); 294 if (!ret) { 295 ret = kobject_init_and_add(&erofs_feat, &erofs_feat_ktype, 296 NULL, "features"); 297 if (!ret) 298 return 0; 299 erofs_exit_sysfs(); 300 } 301 return ret; 302 } 303