Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/hashtable.h> |
| 20 | #include "props.h" |
| 21 | #include "btrfs_inode.h" |
| 22 | #include "hash.h" |
| 23 | #include "transaction.h" |
| 24 | #include "xattr.h" |
Anand Jain | ebb8765 | 2016-03-10 17:26:59 +0800 | [diff] [blame] | 25 | #include "compression.h" |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 26 | |
| 27 | #define BTRFS_PROP_HANDLERS_HT_BITS 8 |
| 28 | static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS); |
| 29 | |
| 30 | struct prop_handler { |
| 31 | struct hlist_node node; |
| 32 | const char *xattr_name; |
| 33 | int (*validate)(const char *value, size_t len); |
| 34 | int (*apply)(struct inode *inode, const char *value, size_t len); |
| 35 | const char *(*extract)(struct inode *inode); |
| 36 | int inheritable; |
| 37 | }; |
| 38 | |
| 39 | static int prop_compression_validate(const char *value, size_t len); |
| 40 | static int prop_compression_apply(struct inode *inode, |
| 41 | const char *value, |
| 42 | size_t len); |
| 43 | static const char *prop_compression_extract(struct inode *inode); |
| 44 | |
| 45 | static struct prop_handler prop_handlers[] = { |
| 46 | { |
| 47 | .xattr_name = XATTR_BTRFS_PREFIX "compression", |
| 48 | .validate = prop_compression_validate, |
| 49 | .apply = prop_compression_apply, |
| 50 | .extract = prop_compression_extract, |
| 51 | .inheritable = 1 |
| 52 | }, |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 53 | }; |
| 54 | |
| 55 | void __init btrfs_props_init(void) |
| 56 | { |
Byongho Lee | 619ed39 | 2015-10-08 20:49:34 +0900 | [diff] [blame] | 57 | int i; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 58 | |
| 59 | hash_init(prop_handlers_ht); |
| 60 | |
Byongho Lee | 619ed39 | 2015-10-08 20:49:34 +0900 | [diff] [blame] | 61 | for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) { |
| 62 | struct prop_handler *p = &prop_handlers[i]; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 63 | u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name)); |
| 64 | |
| 65 | hash_add(prop_handlers_ht, &p->node, h); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash) |
| 70 | { |
| 71 | struct hlist_head *h; |
| 72 | |
| 73 | h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)]; |
| 74 | if (hlist_empty(h)) |
| 75 | return NULL; |
| 76 | |
| 77 | return h; |
| 78 | } |
| 79 | |
| 80 | static const struct prop_handler * |
| 81 | find_prop_handler(const char *name, |
| 82 | const struct hlist_head *handlers) |
| 83 | { |
| 84 | struct prop_handler *h; |
| 85 | |
| 86 | if (!handlers) { |
| 87 | u64 hash = btrfs_name_hash(name, strlen(name)); |
| 88 | |
| 89 | handlers = find_prop_handlers_by_hash(hash); |
| 90 | if (!handlers) |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | hlist_for_each_entry(h, handlers, node) |
| 95 | if (!strcmp(h->xattr_name, name)) |
| 96 | return h; |
| 97 | |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | static int __btrfs_set_prop(struct btrfs_trans_handle *trans, |
| 102 | struct inode *inode, |
| 103 | const char *name, |
| 104 | const char *value, |
| 105 | size_t value_len, |
| 106 | int flags) |
| 107 | { |
| 108 | const struct prop_handler *handler; |
| 109 | int ret; |
| 110 | |
| 111 | if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN) |
| 112 | return -EINVAL; |
| 113 | |
| 114 | handler = find_prop_handler(name, NULL); |
| 115 | if (!handler) |
| 116 | return -EINVAL; |
| 117 | |
| 118 | if (value_len == 0) { |
| 119 | ret = __btrfs_setxattr(trans, inode, handler->xattr_name, |
| 120 | NULL, 0, flags); |
| 121 | if (ret) |
| 122 | return ret; |
| 123 | |
| 124 | ret = handler->apply(inode, NULL, 0); |
| 125 | ASSERT(ret == 0); |
| 126 | |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | ret = handler->validate(value, value_len); |
| 131 | if (ret) |
| 132 | return ret; |
| 133 | ret = __btrfs_setxattr(trans, inode, handler->xattr_name, |
| 134 | value, value_len, flags); |
| 135 | if (ret) |
| 136 | return ret; |
| 137 | ret = handler->apply(inode, value, value_len); |
| 138 | if (ret) { |
| 139 | __btrfs_setxattr(trans, inode, handler->xattr_name, |
| 140 | NULL, 0, flags); |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags); |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | int btrfs_set_prop(struct inode *inode, |
| 150 | const char *name, |
| 151 | const char *value, |
| 152 | size_t value_len, |
| 153 | int flags) |
| 154 | { |
| 155 | return __btrfs_set_prop(NULL, inode, name, value, value_len, flags); |
| 156 | } |
| 157 | |
| 158 | static int iterate_object_props(struct btrfs_root *root, |
| 159 | struct btrfs_path *path, |
| 160 | u64 objectid, |
| 161 | void (*iterator)(void *, |
| 162 | const struct prop_handler *, |
| 163 | const char *, |
| 164 | size_t), |
| 165 | void *ctx) |
| 166 | { |
| 167 | int ret; |
| 168 | char *name_buf = NULL; |
| 169 | char *value_buf = NULL; |
| 170 | int name_buf_len = 0; |
| 171 | int value_buf_len = 0; |
| 172 | |
| 173 | while (1) { |
| 174 | struct btrfs_key key; |
| 175 | struct btrfs_dir_item *di; |
| 176 | struct extent_buffer *leaf; |
| 177 | u32 total_len, cur, this_len; |
| 178 | int slot; |
| 179 | const struct hlist_head *handlers; |
| 180 | |
| 181 | slot = path->slots[0]; |
| 182 | leaf = path->nodes[0]; |
| 183 | |
| 184 | if (slot >= btrfs_header_nritems(leaf)) { |
| 185 | ret = btrfs_next_leaf(root, path); |
| 186 | if (ret < 0) |
| 187 | goto out; |
| 188 | else if (ret > 0) |
| 189 | break; |
| 190 | continue; |
| 191 | } |
| 192 | |
| 193 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 194 | if (key.objectid != objectid) |
| 195 | break; |
| 196 | if (key.type != BTRFS_XATTR_ITEM_KEY) |
| 197 | break; |
| 198 | |
| 199 | handlers = find_prop_handlers_by_hash(key.offset); |
| 200 | if (!handlers) |
| 201 | goto next_slot; |
| 202 | |
| 203 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
| 204 | cur = 0; |
| 205 | total_len = btrfs_item_size_nr(leaf, slot); |
| 206 | |
| 207 | while (cur < total_len) { |
| 208 | u32 name_len = btrfs_dir_name_len(leaf, di); |
| 209 | u32 data_len = btrfs_dir_data_len(leaf, di); |
| 210 | unsigned long name_ptr, data_ptr; |
| 211 | const struct prop_handler *handler; |
| 212 | |
| 213 | this_len = sizeof(*di) + name_len + data_len; |
| 214 | name_ptr = (unsigned long)(di + 1); |
| 215 | data_ptr = name_ptr + name_len; |
| 216 | |
| 217 | if (name_len <= XATTR_BTRFS_PREFIX_LEN || |
| 218 | memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX, |
| 219 | name_ptr, |
| 220 | XATTR_BTRFS_PREFIX_LEN)) |
| 221 | goto next_dir_item; |
| 222 | |
| 223 | if (name_len >= name_buf_len) { |
| 224 | kfree(name_buf); |
| 225 | name_buf_len = name_len + 1; |
| 226 | name_buf = kmalloc(name_buf_len, GFP_NOFS); |
| 227 | if (!name_buf) { |
| 228 | ret = -ENOMEM; |
| 229 | goto out; |
| 230 | } |
| 231 | } |
| 232 | read_extent_buffer(leaf, name_buf, name_ptr, name_len); |
| 233 | name_buf[name_len] = '\0'; |
| 234 | |
| 235 | handler = find_prop_handler(name_buf, handlers); |
| 236 | if (!handler) |
| 237 | goto next_dir_item; |
| 238 | |
| 239 | if (data_len > value_buf_len) { |
| 240 | kfree(value_buf); |
| 241 | value_buf_len = data_len; |
| 242 | value_buf = kmalloc(data_len, GFP_NOFS); |
| 243 | if (!value_buf) { |
| 244 | ret = -ENOMEM; |
| 245 | goto out; |
| 246 | } |
| 247 | } |
| 248 | read_extent_buffer(leaf, value_buf, data_ptr, data_len); |
| 249 | |
| 250 | iterator(ctx, handler, value_buf, data_len); |
| 251 | next_dir_item: |
| 252 | cur += this_len; |
| 253 | di = (struct btrfs_dir_item *)((char *) di + this_len); |
| 254 | } |
| 255 | |
| 256 | next_slot: |
| 257 | path->slots[0]++; |
| 258 | } |
| 259 | |
| 260 | ret = 0; |
| 261 | out: |
| 262 | btrfs_release_path(path); |
| 263 | kfree(name_buf); |
| 264 | kfree(value_buf); |
| 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | static void inode_prop_iterator(void *ctx, |
| 270 | const struct prop_handler *handler, |
| 271 | const char *value, |
| 272 | size_t len) |
| 273 | { |
| 274 | struct inode *inode = ctx; |
| 275 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 276 | int ret; |
| 277 | |
| 278 | ret = handler->apply(inode, value, len); |
| 279 | if (unlikely(ret)) |
| 280 | btrfs_warn(root->fs_info, |
| 281 | "error applying prop %s to ino %llu (root %llu): %d", |
| 282 | handler->xattr_name, btrfs_ino(inode), |
| 283 | root->root_key.objectid, ret); |
| 284 | else |
| 285 | set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags); |
| 286 | } |
| 287 | |
| 288 | int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path) |
| 289 | { |
| 290 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 291 | u64 ino = btrfs_ino(inode); |
| 292 | int ret; |
| 293 | |
| 294 | ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode); |
| 295 | |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | static int inherit_props(struct btrfs_trans_handle *trans, |
| 300 | struct inode *inode, |
| 301 | struct inode *parent) |
| 302 | { |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 303 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 304 | int ret; |
Byongho Lee | 619ed39 | 2015-10-08 20:49:34 +0900 | [diff] [blame] | 305 | int i; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 306 | |
| 307 | if (!test_bit(BTRFS_INODE_HAS_PROPS, |
| 308 | &BTRFS_I(parent)->runtime_flags)) |
| 309 | return 0; |
| 310 | |
Byongho Lee | 619ed39 | 2015-10-08 20:49:34 +0900 | [diff] [blame] | 311 | for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) { |
| 312 | const struct prop_handler *h = &prop_handlers[i]; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 313 | const char *value; |
| 314 | u64 num_bytes; |
| 315 | |
| 316 | if (!h->inheritable) |
| 317 | continue; |
| 318 | |
| 319 | value = h->extract(parent); |
| 320 | if (!value) |
| 321 | continue; |
| 322 | |
| 323 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 324 | ret = btrfs_block_rsv_add(root, trans->block_rsv, |
| 325 | num_bytes, BTRFS_RESERVE_NO_FLUSH); |
| 326 | if (ret) |
| 327 | goto out; |
| 328 | ret = __btrfs_set_prop(trans, inode, h->xattr_name, |
| 329 | value, strlen(value), 0); |
| 330 | btrfs_block_rsv_release(root, trans->block_rsv, num_bytes); |
| 331 | if (ret) |
| 332 | goto out; |
| 333 | } |
| 334 | ret = 0; |
| 335 | out: |
| 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans, |
| 340 | struct inode *inode, |
| 341 | struct inode *dir) |
| 342 | { |
| 343 | if (!dir) |
| 344 | return 0; |
| 345 | |
| 346 | return inherit_props(trans, inode, dir); |
| 347 | } |
| 348 | |
| 349 | int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans, |
| 350 | struct btrfs_root *root, |
| 351 | struct btrfs_root *parent_root) |
| 352 | { |
Jeff Mahoney | bd6c57d | 2016-06-10 17:03:59 -0400 | [diff] [blame] | 353 | struct super_block *sb = root->fs_info->sb; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 354 | struct btrfs_key key; |
| 355 | struct inode *parent_inode, *child_inode; |
| 356 | int ret; |
| 357 | |
| 358 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 359 | key.type = BTRFS_INODE_ITEM_KEY; |
| 360 | key.offset = 0; |
| 361 | |
Jeff Mahoney | bd6c57d | 2016-06-10 17:03:59 -0400 | [diff] [blame] | 362 | parent_inode = btrfs_iget(sb, &key, parent_root, NULL); |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 363 | if (IS_ERR(parent_inode)) |
| 364 | return PTR_ERR(parent_inode); |
| 365 | |
Jeff Mahoney | bd6c57d | 2016-06-10 17:03:59 -0400 | [diff] [blame] | 366 | child_inode = btrfs_iget(sb, &key, root, NULL); |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 367 | if (IS_ERR(child_inode)) { |
| 368 | iput(parent_inode); |
| 369 | return PTR_ERR(child_inode); |
| 370 | } |
| 371 | |
| 372 | ret = inherit_props(trans, child_inode, parent_inode); |
| 373 | iput(child_inode); |
| 374 | iput(parent_inode); |
| 375 | |
| 376 | return ret; |
| 377 | } |
| 378 | |
| 379 | static int prop_compression_validate(const char *value, size_t len) |
| 380 | { |
| 381 | if (!strncmp("lzo", value, len)) |
| 382 | return 0; |
| 383 | else if (!strncmp("zlib", value, len)) |
| 384 | return 0; |
| 385 | |
| 386 | return -EINVAL; |
| 387 | } |
| 388 | |
| 389 | static int prop_compression_apply(struct inode *inode, |
| 390 | const char *value, |
| 391 | size_t len) |
| 392 | { |
| 393 | int type; |
| 394 | |
| 395 | if (len == 0) { |
| 396 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
| 397 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; |
| 398 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | if (!strncmp("lzo", value, len)) |
| 404 | type = BTRFS_COMPRESS_LZO; |
| 405 | else if (!strncmp("zlib", value, len)) |
| 406 | type = BTRFS_COMPRESS_ZLIB; |
| 407 | else |
| 408 | return -EINVAL; |
| 409 | |
| 410 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; |
| 411 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; |
| 412 | BTRFS_I(inode)->force_compress = type; |
| 413 | |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | static const char *prop_compression_extract(struct inode *inode) |
| 418 | { |
| 419 | switch (BTRFS_I(inode)->force_compress) { |
| 420 | case BTRFS_COMPRESS_ZLIB: |
| 421 | return "zlib"; |
| 422 | case BTRFS_COMPRESS_LZO: |
| 423 | return "lzo"; |
| 424 | } |
| 425 | |
| 426 | return NULL; |
| 427 | } |
David Sterba | e8c9f18 | 2015-01-02 18:23:10 +0100 | [diff] [blame] | 428 | |
| 429 | |