Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hfsplus/attributes.c |
| 3 | * |
| 4 | * Vyacheslav Dubeyko <slava@dubeyko.com> |
| 5 | * |
| 6 | * Handling of records in attributes tree |
| 7 | */ |
| 8 | |
| 9 | #include "hfsplus_fs.h" |
| 10 | #include "hfsplus_raw.h" |
| 11 | |
| 12 | static struct kmem_cache *hfsplus_attr_tree_cachep; |
| 13 | |
Fabian Frederick | c11e614 | 2014-04-03 14:50:35 -0700 | [diff] [blame] | 14 | int __init hfsplus_create_attr_tree_cache(void) |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 15 | { |
| 16 | if (hfsplus_attr_tree_cachep) |
| 17 | return -EEXIST; |
| 18 | |
| 19 | hfsplus_attr_tree_cachep = |
| 20 | kmem_cache_create("hfsplus_attr_cache", |
| 21 | sizeof(hfsplus_attr_entry), 0, |
| 22 | SLAB_HWCACHE_ALIGN, NULL); |
| 23 | if (!hfsplus_attr_tree_cachep) |
| 24 | return -ENOMEM; |
| 25 | |
| 26 | return 0; |
| 27 | } |
| 28 | |
| 29 | void hfsplus_destroy_attr_tree_cache(void) |
| 30 | { |
| 31 | kmem_cache_destroy(hfsplus_attr_tree_cachep); |
| 32 | } |
| 33 | |
| 34 | int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1, |
| 35 | const hfsplus_btree_key *k2) |
| 36 | { |
| 37 | __be32 k1_cnid, k2_cnid; |
| 38 | |
| 39 | k1_cnid = k1->attr.cnid; |
| 40 | k2_cnid = k2->attr.cnid; |
| 41 | if (k1_cnid != k2_cnid) |
| 42 | return be32_to_cpu(k1_cnid) < be32_to_cpu(k2_cnid) ? -1 : 1; |
| 43 | |
| 44 | return hfsplus_strcmp( |
| 45 | (const struct hfsplus_unistr *)&k1->attr.key_name, |
| 46 | (const struct hfsplus_unistr *)&k2->attr.key_name); |
| 47 | } |
| 48 | |
| 49 | int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key, |
| 50 | u32 cnid, const char *name) |
| 51 | { |
| 52 | int len; |
| 53 | |
| 54 | memset(key, 0, sizeof(struct hfsplus_attr_key)); |
| 55 | key->attr.cnid = cpu_to_be32(cnid); |
| 56 | if (name) { |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame^] | 57 | int res = hfsplus_asc2uni(sb, |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 58 | (struct hfsplus_unistr *)&key->attr.key_name, |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame^] | 59 | HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name)); |
| 60 | if (res) |
| 61 | return res; |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 62 | len = be16_to_cpu(key->attr.key_name.length); |
| 63 | } else { |
| 64 | key->attr.key_name.length = 0; |
| 65 | len = 0; |
| 66 | } |
| 67 | |
| 68 | /* The length of the key, as stored in key_len field, does not include |
| 69 | * the size of the key_len field itself. |
| 70 | * So, offsetof(hfsplus_attr_key, key_name) is a trick because |
| 71 | * it takes into consideration key_len field (__be16) of |
| 72 | * hfsplus_attr_key structure instead of length field (__be16) of |
| 73 | * hfsplus_attr_unistr structure. |
| 74 | */ |
| 75 | key->key_len = |
| 76 | cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) + |
| 77 | 2 * len); |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | void hfsplus_attr_build_key_uni(hfsplus_btree_key *key, |
| 83 | u32 cnid, |
| 84 | struct hfsplus_attr_unistr *name) |
| 85 | { |
| 86 | int ustrlen; |
| 87 | |
| 88 | memset(key, 0, sizeof(struct hfsplus_attr_key)); |
| 89 | ustrlen = be16_to_cpu(name->length); |
| 90 | key->attr.cnid = cpu_to_be32(cnid); |
| 91 | key->attr.key_name.length = cpu_to_be16(ustrlen); |
| 92 | ustrlen *= 2; |
| 93 | memcpy(key->attr.key_name.unicode, name->unicode, ustrlen); |
| 94 | |
| 95 | /* The length of the key, as stored in key_len field, does not include |
| 96 | * the size of the key_len field itself. |
| 97 | * So, offsetof(hfsplus_attr_key, key_name) is a trick because |
| 98 | * it takes into consideration key_len field (__be16) of |
| 99 | * hfsplus_attr_key structure instead of length field (__be16) of |
| 100 | * hfsplus_attr_unistr structure. |
| 101 | */ |
| 102 | key->key_len = |
| 103 | cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) + |
| 104 | ustrlen); |
| 105 | } |
| 106 | |
| 107 | hfsplus_attr_entry *hfsplus_alloc_attr_entry(void) |
| 108 | { |
| 109 | return kmem_cache_alloc(hfsplus_attr_tree_cachep, GFP_KERNEL); |
| 110 | } |
| 111 | |
| 112 | void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry) |
| 113 | { |
| 114 | if (entry) |
| 115 | kmem_cache_free(hfsplus_attr_tree_cachep, entry); |
| 116 | } |
| 117 | |
| 118 | #define HFSPLUS_INVALID_ATTR_RECORD -1 |
| 119 | |
| 120 | static int hfsplus_attr_build_record(hfsplus_attr_entry *entry, int record_type, |
| 121 | u32 cnid, const void *value, size_t size) |
| 122 | { |
| 123 | if (record_type == HFSPLUS_ATTR_FORK_DATA) { |
| 124 | /* |
| 125 | * Mac OS X supports only inline data attributes. |
| 126 | * Do nothing |
| 127 | */ |
| 128 | memset(entry, 0, sizeof(*entry)); |
| 129 | return sizeof(struct hfsplus_attr_fork_data); |
| 130 | } else if (record_type == HFSPLUS_ATTR_EXTENTS) { |
| 131 | /* |
| 132 | * Mac OS X supports only inline data attributes. |
| 133 | * Do nothing. |
| 134 | */ |
| 135 | memset(entry, 0, sizeof(*entry)); |
| 136 | return sizeof(struct hfsplus_attr_extents); |
| 137 | } else if (record_type == HFSPLUS_ATTR_INLINE_DATA) { |
| 138 | u16 len; |
| 139 | |
| 140 | memset(entry, 0, sizeof(struct hfsplus_attr_inline_data)); |
| 141 | entry->inline_data.record_type = cpu_to_be32(record_type); |
| 142 | if (size <= HFSPLUS_MAX_INLINE_DATA_SIZE) |
| 143 | len = size; |
| 144 | else |
| 145 | return HFSPLUS_INVALID_ATTR_RECORD; |
| 146 | entry->inline_data.length = cpu_to_be16(len); |
| 147 | memcpy(entry->inline_data.raw_bytes, value, len); |
| 148 | /* |
| 149 | * Align len on two-byte boundary. |
| 150 | * It needs to add pad byte if we have odd len. |
| 151 | */ |
| 152 | len = round_up(len, 2); |
| 153 | return offsetof(struct hfsplus_attr_inline_data, raw_bytes) + |
| 154 | len; |
| 155 | } else /* invalid input */ |
| 156 | memset(entry, 0, sizeof(*entry)); |
| 157 | |
| 158 | return HFSPLUS_INVALID_ATTR_RECORD; |
| 159 | } |
| 160 | |
| 161 | int hfsplus_find_attr(struct super_block *sb, u32 cnid, |
| 162 | const char *name, struct hfs_find_data *fd) |
| 163 | { |
| 164 | int err = 0; |
| 165 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 166 | hfs_dbg(ATTR_MOD, "find_attr: %s,%d\n", name ? name : NULL, cnid); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 167 | |
| 168 | if (!HFSPLUS_SB(sb)->attr_tree) { |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 169 | pr_err("attributes file doesn't exist\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 170 | return -EINVAL; |
| 171 | } |
| 172 | |
| 173 | if (name) { |
| 174 | err = hfsplus_attr_build_key(sb, fd->search_key, cnid, name); |
| 175 | if (err) |
| 176 | goto failed_find_attr; |
| 177 | err = hfs_brec_find(fd, hfs_find_rec_by_key); |
| 178 | if (err) |
| 179 | goto failed_find_attr; |
| 180 | } else { |
| 181 | err = hfsplus_attr_build_key(sb, fd->search_key, cnid, NULL); |
| 182 | if (err) |
| 183 | goto failed_find_attr; |
| 184 | err = hfs_brec_find(fd, hfs_find_1st_rec_by_cnid); |
| 185 | if (err) |
| 186 | goto failed_find_attr; |
| 187 | } |
| 188 | |
| 189 | failed_find_attr: |
| 190 | return err; |
| 191 | } |
| 192 | |
| 193 | int hfsplus_attr_exists(struct inode *inode, const char *name) |
| 194 | { |
| 195 | int err = 0; |
| 196 | struct super_block *sb = inode->i_sb; |
| 197 | struct hfs_find_data fd; |
| 198 | |
| 199 | if (!HFSPLUS_SB(sb)->attr_tree) |
| 200 | return 0; |
| 201 | |
| 202 | err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
| 203 | if (err) |
| 204 | return 0; |
| 205 | |
| 206 | err = hfsplus_find_attr(sb, inode->i_ino, name, &fd); |
| 207 | if (err) |
| 208 | goto attr_not_found; |
| 209 | |
| 210 | hfs_find_exit(&fd); |
| 211 | return 1; |
| 212 | |
| 213 | attr_not_found: |
| 214 | hfs_find_exit(&fd); |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | int hfsplus_create_attr(struct inode *inode, |
| 219 | const char *name, |
| 220 | const void *value, size_t size) |
| 221 | { |
| 222 | struct super_block *sb = inode->i_sb; |
| 223 | struct hfs_find_data fd; |
| 224 | hfsplus_attr_entry *entry_ptr; |
| 225 | int entry_size; |
| 226 | int err; |
| 227 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 228 | hfs_dbg(ATTR_MOD, "create_attr: %s,%ld\n", |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 229 | name ? name : NULL, inode->i_ino); |
| 230 | |
| 231 | if (!HFSPLUS_SB(sb)->attr_tree) { |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 232 | pr_err("attributes file doesn't exist\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 233 | return -EINVAL; |
| 234 | } |
| 235 | |
| 236 | entry_ptr = hfsplus_alloc_attr_entry(); |
| 237 | if (!entry_ptr) |
| 238 | return -ENOMEM; |
| 239 | |
| 240 | err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
| 241 | if (err) |
| 242 | goto failed_init_create_attr; |
| 243 | |
| 244 | if (name) { |
| 245 | err = hfsplus_attr_build_key(sb, fd.search_key, |
| 246 | inode->i_ino, name); |
| 247 | if (err) |
| 248 | goto failed_create_attr; |
| 249 | } else { |
| 250 | err = -EINVAL; |
| 251 | goto failed_create_attr; |
| 252 | } |
| 253 | |
| 254 | /* Mac OS X supports only inline data attributes. */ |
| 255 | entry_size = hfsplus_attr_build_record(entry_ptr, |
| 256 | HFSPLUS_ATTR_INLINE_DATA, |
| 257 | inode->i_ino, |
| 258 | value, size); |
| 259 | if (entry_size == HFSPLUS_INVALID_ATTR_RECORD) { |
| 260 | err = -EINVAL; |
| 261 | goto failed_create_attr; |
| 262 | } |
| 263 | |
| 264 | err = hfs_brec_find(&fd, hfs_find_rec_by_key); |
| 265 | if (err != -ENOENT) { |
| 266 | if (!err) |
| 267 | err = -EEXIST; |
| 268 | goto failed_create_attr; |
| 269 | } |
| 270 | |
| 271 | err = hfs_brec_insert(&fd, entry_ptr, entry_size); |
| 272 | if (err) |
| 273 | goto failed_create_attr; |
| 274 | |
| 275 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY); |
| 276 | |
| 277 | failed_create_attr: |
| 278 | hfs_find_exit(&fd); |
| 279 | |
| 280 | failed_init_create_attr: |
| 281 | hfsplus_destroy_attr_entry(entry_ptr); |
| 282 | return err; |
| 283 | } |
| 284 | |
| 285 | static int __hfsplus_delete_attr(struct inode *inode, u32 cnid, |
| 286 | struct hfs_find_data *fd) |
| 287 | { |
| 288 | int err = 0; |
| 289 | __be32 found_cnid, record_type; |
| 290 | |
| 291 | hfs_bnode_read(fd->bnode, &found_cnid, |
| 292 | fd->keyoffset + |
| 293 | offsetof(struct hfsplus_attr_key, cnid), |
| 294 | sizeof(__be32)); |
| 295 | if (cnid != be32_to_cpu(found_cnid)) |
| 296 | return -ENOENT; |
| 297 | |
| 298 | hfs_bnode_read(fd->bnode, &record_type, |
| 299 | fd->entryoffset, sizeof(record_type)); |
| 300 | |
| 301 | switch (be32_to_cpu(record_type)) { |
| 302 | case HFSPLUS_ATTR_INLINE_DATA: |
| 303 | /* All is OK. Do nothing. */ |
| 304 | break; |
| 305 | case HFSPLUS_ATTR_FORK_DATA: |
| 306 | case HFSPLUS_ATTR_EXTENTS: |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 307 | pr_err("only inline data xattr are supported\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 308 | return -EOPNOTSUPP; |
| 309 | default: |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 310 | pr_err("invalid extended attribute record\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 311 | return -ENOENT; |
| 312 | } |
| 313 | |
| 314 | err = hfs_brec_remove(fd); |
| 315 | if (err) |
| 316 | return err; |
| 317 | |
| 318 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY); |
| 319 | return err; |
| 320 | } |
| 321 | |
| 322 | int hfsplus_delete_attr(struct inode *inode, const char *name) |
| 323 | { |
| 324 | int err = 0; |
| 325 | struct super_block *sb = inode->i_sb; |
| 326 | struct hfs_find_data fd; |
| 327 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 328 | hfs_dbg(ATTR_MOD, "delete_attr: %s,%ld\n", |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 329 | name ? name : NULL, inode->i_ino); |
| 330 | |
| 331 | if (!HFSPLUS_SB(sb)->attr_tree) { |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 332 | pr_err("attributes file doesn't exist\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 333 | return -EINVAL; |
| 334 | } |
| 335 | |
| 336 | err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
| 337 | if (err) |
| 338 | return err; |
| 339 | |
| 340 | if (name) { |
| 341 | err = hfsplus_attr_build_key(sb, fd.search_key, |
| 342 | inode->i_ino, name); |
| 343 | if (err) |
| 344 | goto out; |
| 345 | } else { |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 346 | pr_err("invalid extended attribute name\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 347 | err = -EINVAL; |
| 348 | goto out; |
| 349 | } |
| 350 | |
| 351 | err = hfs_brec_find(&fd, hfs_find_rec_by_key); |
| 352 | if (err) |
| 353 | goto out; |
| 354 | |
| 355 | err = __hfsplus_delete_attr(inode, inode->i_ino, &fd); |
| 356 | if (err) |
| 357 | goto out; |
| 358 | |
| 359 | out: |
| 360 | hfs_find_exit(&fd); |
| 361 | return err; |
| 362 | } |
| 363 | |
| 364 | int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid) |
| 365 | { |
| 366 | int err = 0; |
| 367 | struct hfs_find_data fd; |
| 368 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 369 | hfs_dbg(ATTR_MOD, "delete_all_attrs: %d\n", cnid); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 370 | |
| 371 | if (!HFSPLUS_SB(dir->i_sb)->attr_tree) { |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 372 | pr_err("attributes file doesn't exist\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 373 | return -EINVAL; |
| 374 | } |
| 375 | |
| 376 | err = hfs_find_init(HFSPLUS_SB(dir->i_sb)->attr_tree, &fd); |
| 377 | if (err) |
| 378 | return err; |
| 379 | |
| 380 | for (;;) { |
| 381 | err = hfsplus_find_attr(dir->i_sb, cnid, NULL, &fd); |
| 382 | if (err) { |
| 383 | if (err != -ENOENT) |
Joe Perches | d614267 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 384 | pr_err("xattr search failed\n"); |
Vyacheslav Dubeyko | 3e05ca2 | 2013-02-27 17:03:01 -0800 | [diff] [blame] | 385 | goto end_delete_all; |
| 386 | } |
| 387 | |
| 388 | err = __hfsplus_delete_attr(dir, cnid, &fd); |
| 389 | if (err) |
| 390 | goto end_delete_all; |
| 391 | } |
| 392 | |
| 393 | end_delete_all: |
| 394 | hfs_find_exit(&fd); |
| 395 | return err; |
| 396 | } |