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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
4 */
5
6#include <linux/hashtable.h>
7#include "messages.h"
8#include "props.h"
9#include "btrfs_inode.h"
10#include "transaction.h"
11#include "ctree.h"
12#include "xattr.h"
13#include "compression.h"
14#include "space-info.h"
15#include "fs.h"
16#include "accessors.h"
17#include "super.h"
18#include "dir-item.h"
19
20#define BTRFS_PROP_HANDLERS_HT_BITS 8
21static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);
22
23struct prop_handler {
24 struct hlist_node node;
25 const char *xattr_name;
26 int (*validate)(const struct btrfs_inode *inode, const char *value,
27 size_t len);
28 int (*apply)(struct inode *inode, const char *value, size_t len);
29 const char *(*extract)(struct inode *inode);
30 bool (*ignore)(const struct btrfs_inode *inode);
31 int inheritable;
32};
33
34static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
35{
36 struct hlist_head *h;
37
38 h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)];
39 if (hlist_empty(h))
40 return NULL;
41
42 return h;
43}
44
45static const struct prop_handler *
46find_prop_handler(const char *name,
47 const struct hlist_head *handlers)
48{
49 struct prop_handler *h;
50
51 if (!handlers) {
52 u64 hash = btrfs_name_hash(name, strlen(name));
53
54 handlers = find_prop_handlers_by_hash(hash);
55 if (!handlers)
56 return NULL;
57 }
58
59 hlist_for_each_entry(h, handlers, node)
60 if (!strcmp(h->xattr_name, name))
61 return h;
62
63 return NULL;
64}
65
66int btrfs_validate_prop(const struct btrfs_inode *inode, const char *name,
67 const char *value, size_t value_len)
68{
69 const struct prop_handler *handler;
70
71 if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
72 return -EINVAL;
73
74 handler = find_prop_handler(name, NULL);
75 if (!handler)
76 return -EINVAL;
77
78 if (value_len == 0)
79 return 0;
80
81 return handler->validate(inode, value, value_len);
82}
83
84/*
85 * Check if a property should be ignored (not set) for an inode.
86 *
87 * @inode: The target inode.
88 * @name: The property's name.
89 *
90 * The caller must be sure the given property name is valid, for example by
91 * having previously called btrfs_validate_prop().
92 *
93 * Returns: true if the property should be ignored for the given inode
94 * false if the property must not be ignored for the given inode
95 */
96bool btrfs_ignore_prop(const struct btrfs_inode *inode, const char *name)
97{
98 const struct prop_handler *handler;
99
100 handler = find_prop_handler(name, NULL);
101 ASSERT(handler != NULL);
102
103 return handler->ignore(inode);
104}
105
106int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
107 const char *name, const char *value, size_t value_len,
108 int flags)
109{
110 const struct prop_handler *handler;
111 int ret;
112
113 handler = find_prop_handler(name, NULL);
114 if (!handler)
115 return -EINVAL;
116
117 if (value_len == 0) {
118 ret = btrfs_setxattr(trans, inode, handler->xattr_name,
119 NULL, 0, flags);
120 if (ret)
121 return ret;
122
123 ret = handler->apply(inode, NULL, 0);
124 ASSERT(ret == 0);
125
126 return ret;
127 }
128
129 ret = btrfs_setxattr(trans, inode, handler->xattr_name, value,
130 value_len, flags);
131 if (ret)
132 return ret;
133 ret = handler->apply(inode, value, value_len);
134 if (ret) {
135 btrfs_setxattr(trans, inode, handler->xattr_name, NULL,
136 0, flags);
137 return ret;
138 }
139
140 set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
141
142 return 0;
143}
144
145static int iterate_object_props(struct btrfs_root *root,
146 struct btrfs_path *path,
147 u64 objectid,
148 void (*iterator)(void *,
149 const struct prop_handler *,
150 const char *,
151 size_t),
152 void *ctx)
153{
154 int ret;
155 char *name_buf = NULL;
156 char *value_buf = NULL;
157 int name_buf_len = 0;
158 int value_buf_len = 0;
159
160 while (1) {
161 struct btrfs_key key;
162 struct btrfs_dir_item *di;
163 struct extent_buffer *leaf;
164 u32 total_len, cur, this_len;
165 int slot;
166 const struct hlist_head *handlers;
167
168 slot = path->slots[0];
169 leaf = path->nodes[0];
170
171 if (slot >= btrfs_header_nritems(leaf)) {
172 ret = btrfs_next_leaf(root, path);
173 if (ret < 0)
174 goto out;
175 else if (ret > 0)
176 break;
177 continue;
178 }
179
180 btrfs_item_key_to_cpu(leaf, &key, slot);
181 if (key.objectid != objectid)
182 break;
183 if (key.type != BTRFS_XATTR_ITEM_KEY)
184 break;
185
186 handlers = find_prop_handlers_by_hash(key.offset);
187 if (!handlers)
188 goto next_slot;
189
190 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
191 cur = 0;
192 total_len = btrfs_item_size(leaf, slot);
193
194 while (cur < total_len) {
195 u32 name_len = btrfs_dir_name_len(leaf, di);
196 u32 data_len = btrfs_dir_data_len(leaf, di);
197 unsigned long name_ptr, data_ptr;
198 const struct prop_handler *handler;
199
200 this_len = sizeof(*di) + name_len + data_len;
201 name_ptr = (unsigned long)(di + 1);
202 data_ptr = name_ptr + name_len;
203
204 if (name_len <= XATTR_BTRFS_PREFIX_LEN ||
205 memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
206 name_ptr,
207 XATTR_BTRFS_PREFIX_LEN))
208 goto next_dir_item;
209
210 if (name_len >= name_buf_len) {
211 kfree(name_buf);
212 name_buf_len = name_len + 1;
213 name_buf = kmalloc(name_buf_len, GFP_NOFS);
214 if (!name_buf) {
215 ret = -ENOMEM;
216 goto out;
217 }
218 }
219 read_extent_buffer(leaf, name_buf, name_ptr, name_len);
220 name_buf[name_len] = '\0';
221
222 handler = find_prop_handler(name_buf, handlers);
223 if (!handler)
224 goto next_dir_item;
225
226 if (data_len > value_buf_len) {
227 kfree(value_buf);
228 value_buf_len = data_len;
229 value_buf = kmalloc(data_len, GFP_NOFS);
230 if (!value_buf) {
231 ret = -ENOMEM;
232 goto out;
233 }
234 }
235 read_extent_buffer(leaf, value_buf, data_ptr, data_len);
236
237 iterator(ctx, handler, value_buf, data_len);
238next_dir_item:
239 cur += this_len;
240 di = (struct btrfs_dir_item *)((char *) di + this_len);
241 }
242
243next_slot:
244 path->slots[0]++;
245 }
246
247 ret = 0;
248out:
249 btrfs_release_path(path);
250 kfree(name_buf);
251 kfree(value_buf);
252
253 return ret;
254}
255
256static void inode_prop_iterator(void *ctx,
257 const struct prop_handler *handler,
258 const char *value,
259 size_t len)
260{
261 struct inode *inode = ctx;
262 struct btrfs_root *root = BTRFS_I(inode)->root;
263 int ret;
264
265 ret = handler->apply(inode, value, len);
266 if (unlikely(ret))
267 btrfs_warn(root->fs_info,
268 "error applying prop %s to ino %llu (root %llu): %d",
269 handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
270 root->root_key.objectid, ret);
271 else
272 set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
273}
274
275int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path)
276{
277 struct btrfs_root *root = BTRFS_I(inode)->root;
278 u64 ino = btrfs_ino(BTRFS_I(inode));
279
280 return iterate_object_props(root, path, ino, inode_prop_iterator, inode);
281}
282
283static int prop_compression_validate(const struct btrfs_inode *inode,
284 const char *value, size_t len)
285{
286 if (!btrfs_inode_can_compress(inode))
287 return -EINVAL;
288
289 if (!value)
290 return 0;
291
292 if (btrfs_compress_is_valid_type(value, len))
293 return 0;
294
295 if ((len == 2 && strncmp("no", value, 2) == 0) ||
296 (len == 4 && strncmp("none", value, 4) == 0))
297 return 0;
298
299 return -EINVAL;
300}
301
302static int prop_compression_apply(struct inode *inode, const char *value,
303 size_t len)
304{
305 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
306 int type;
307
308 /* Reset to defaults */
309 if (len == 0) {
310 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
311 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
312 BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
313 return 0;
314 }
315
316 /* Set NOCOMPRESS flag */
317 if ((len == 2 && strncmp("no", value, 2) == 0) ||
318 (len == 4 && strncmp("none", value, 4) == 0)) {
319 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
320 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
321 BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
322
323 return 0;
324 }
325
326 if (!strncmp("lzo", value, 3)) {
327 type = BTRFS_COMPRESS_LZO;
328 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
329 } else if (!strncmp("zlib", value, 4)) {
330 type = BTRFS_COMPRESS_ZLIB;
331 } else if (!strncmp("zstd", value, 4)) {
332 type = BTRFS_COMPRESS_ZSTD;
333 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
334 } else {
335 return -EINVAL;
336 }
337
338 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
339 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
340 BTRFS_I(inode)->prop_compress = type;
341
342 return 0;
343}
344
345static bool prop_compression_ignore(const struct btrfs_inode *inode)
346{
347 /*
348 * Compression only has effect for regular files, and for directories
349 * we set it just to propagate it to new files created inside them.
350 * Everything else (symlinks, devices, sockets, fifos) is pointless as
351 * it will do nothing, so don't waste metadata space on a compression
352 * xattr for anything that is neither a file nor a directory.
353 */
354 if (!S_ISREG(inode->vfs_inode.i_mode) &&
355 !S_ISDIR(inode->vfs_inode.i_mode))
356 return true;
357
358 return false;
359}
360
361static const char *prop_compression_extract(struct inode *inode)
362{
363 switch (BTRFS_I(inode)->prop_compress) {
364 case BTRFS_COMPRESS_ZLIB:
365 case BTRFS_COMPRESS_LZO:
366 case BTRFS_COMPRESS_ZSTD:
367 return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
368 default:
369 break;
370 }
371
372 return NULL;
373}
374
375static struct prop_handler prop_handlers[] = {
376 {
377 .xattr_name = XATTR_BTRFS_PREFIX "compression",
378 .validate = prop_compression_validate,
379 .apply = prop_compression_apply,
380 .extract = prop_compression_extract,
381 .ignore = prop_compression_ignore,
382 .inheritable = 1
383 },
384};
385
386int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
387 struct inode *inode, struct inode *parent)
388{
389 struct btrfs_root *root = BTRFS_I(inode)->root;
390 struct btrfs_fs_info *fs_info = root->fs_info;
391 int ret;
392 int i;
393 bool need_reserve = false;
394
395 if (!test_bit(BTRFS_INODE_HAS_PROPS,
396 &BTRFS_I(parent)->runtime_flags))
397 return 0;
398
399 for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
400 const struct prop_handler *h = &prop_handlers[i];
401 const char *value;
402 u64 num_bytes = 0;
403
404 if (!h->inheritable)
405 continue;
406
407 if (h->ignore(BTRFS_I(inode)))
408 continue;
409
410 value = h->extract(parent);
411 if (!value)
412 continue;
413
414 /*
415 * This is not strictly necessary as the property should be
416 * valid, but in case it isn't, don't propagate it further.
417 */
418 ret = h->validate(BTRFS_I(inode), value, strlen(value));
419 if (ret)
420 continue;
421
422 /*
423 * Currently callers should be reserving 1 item for properties,
424 * since we only have 1 property that we currently support. If
425 * we add more in the future we need to try and reserve more
426 * space for them. But we should also revisit how we do space
427 * reservations if we do add more properties in the future.
428 */
429 if (need_reserve) {
430 num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
431 ret = btrfs_block_rsv_add(fs_info, trans->block_rsv,
432 num_bytes,
433 BTRFS_RESERVE_NO_FLUSH);
434 if (ret)
435 return ret;
436 }
437
438 ret = btrfs_setxattr(trans, inode, h->xattr_name, value,
439 strlen(value), 0);
440 if (!ret) {
441 ret = h->apply(inode, value, strlen(value));
442 if (ret)
443 btrfs_setxattr(trans, inode, h->xattr_name,
444 NULL, 0, 0);
445 else
446 set_bit(BTRFS_INODE_HAS_PROPS,
447 &BTRFS_I(inode)->runtime_flags);
448 }
449
450 if (need_reserve) {
451 btrfs_block_rsv_release(fs_info, trans->block_rsv,
452 num_bytes, NULL);
453 if (ret)
454 return ret;
455 }
456 need_reserve = true;
457 }
458
459 return 0;
460}
461
462int __init btrfs_props_init(void)
463{
464 int i;
465
466 for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
467 struct prop_handler *p = &prop_handlers[i];
468 u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
469
470 hash_add(prop_handlers_ht, &p->node, h);
471 }
472 return 0;
473}
474
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"
25#include "compression.h"
26
27#define BTRFS_PROP_HANDLERS_HT_BITS 8
28static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);
29
30struct 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
39static int prop_compression_validate(const char *value, size_t len);
40static int prop_compression_apply(struct inode *inode,
41 const char *value,
42 size_t len);
43static const char *prop_compression_extract(struct inode *inode);
44
45static 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 },
53};
54
55void __init btrfs_props_init(void)
56{
57 int i;
58
59 hash_init(prop_handlers_ht);
60
61 for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
62 struct prop_handler *p = &prop_handlers[i];
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
69static 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
80static const struct prop_handler *
81find_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
101static 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
149int 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
158static 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);
251next_dir_item:
252 cur += this_len;
253 di = (struct btrfs_dir_item *)((char *) di + this_len);
254 }
255
256next_slot:
257 path->slots[0]++;
258 }
259
260 ret = 0;
261out:
262 btrfs_release_path(path);
263 kfree(name_buf);
264 kfree(value_buf);
265
266 return ret;
267}
268
269static 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
288int 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
299static int inherit_props(struct btrfs_trans_handle *trans,
300 struct inode *inode,
301 struct inode *parent)
302{
303 struct btrfs_root *root = BTRFS_I(inode)->root;
304 struct btrfs_fs_info *fs_info = root->fs_info;
305 int ret;
306 int i;
307
308 if (!test_bit(BTRFS_INODE_HAS_PROPS,
309 &BTRFS_I(parent)->runtime_flags))
310 return 0;
311
312 for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
313 const struct prop_handler *h = &prop_handlers[i];
314 const char *value;
315 u64 num_bytes;
316
317 if (!h->inheritable)
318 continue;
319
320 value = h->extract(parent);
321 if (!value)
322 continue;
323
324 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
325 ret = btrfs_block_rsv_add(root, trans->block_rsv,
326 num_bytes, BTRFS_RESERVE_NO_FLUSH);
327 if (ret)
328 goto out;
329 ret = __btrfs_set_prop(trans, inode, h->xattr_name,
330 value, strlen(value), 0);
331 btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes);
332 if (ret)
333 goto out;
334 }
335 ret = 0;
336out:
337 return ret;
338}
339
340int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
341 struct inode *inode,
342 struct inode *dir)
343{
344 if (!dir)
345 return 0;
346
347 return inherit_props(trans, inode, dir);
348}
349
350int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
351 struct btrfs_root *root,
352 struct btrfs_root *parent_root)
353{
354 struct super_block *sb = root->fs_info->sb;
355 struct btrfs_key key;
356 struct inode *parent_inode, *child_inode;
357 int ret;
358
359 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
360 key.type = BTRFS_INODE_ITEM_KEY;
361 key.offset = 0;
362
363 parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
364 if (IS_ERR(parent_inode))
365 return PTR_ERR(parent_inode);
366
367 child_inode = btrfs_iget(sb, &key, root, NULL);
368 if (IS_ERR(child_inode)) {
369 iput(parent_inode);
370 return PTR_ERR(child_inode);
371 }
372
373 ret = inherit_props(trans, child_inode, parent_inode);
374 iput(child_inode);
375 iput(parent_inode);
376
377 return ret;
378}
379
380static int prop_compression_validate(const char *value, size_t len)
381{
382 if (!strncmp("lzo", value, len))
383 return 0;
384 else if (!strncmp("zlib", value, len))
385 return 0;
386
387 return -EINVAL;
388}
389
390static int prop_compression_apply(struct inode *inode,
391 const char *value,
392 size_t len)
393{
394 int type;
395
396 if (len == 0) {
397 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
398 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
399 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
400
401 return 0;
402 }
403
404 if (!strncmp("lzo", value, len))
405 type = BTRFS_COMPRESS_LZO;
406 else if (!strncmp("zlib", value, len))
407 type = BTRFS_COMPRESS_ZLIB;
408 else
409 return -EINVAL;
410
411 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
412 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
413 BTRFS_I(inode)->force_compress = type;
414
415 return 0;
416}
417
418static const char *prop_compression_extract(struct inode *inode)
419{
420 switch (BTRFS_I(inode)->force_compress) {
421 case BTRFS_COMPRESS_ZLIB:
422 return "zlib";
423 case BTRFS_COMPRESS_LZO:
424 return "lzo";
425 }
426
427 return NULL;
428}
429
430