1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
5
6 #include "messages.h"
7 #include "ctree.h"
8 #include "disk-io.h"
9 #include "print-tree.h"
10 #include "accessors.h"
11 #include "tree-checker.h"
12
13 struct root_name_map {
14 u64 id;
15 const char *name;
16 };
17
18 static const struct root_name_map root_map[] = {
19 { BTRFS_ROOT_TREE_OBJECTID, "ROOT_TREE" },
20 { BTRFS_EXTENT_TREE_OBJECTID, "EXTENT_TREE" },
21 { BTRFS_CHUNK_TREE_OBJECTID, "CHUNK_TREE" },
22 { BTRFS_DEV_TREE_OBJECTID, "DEV_TREE" },
23 { BTRFS_FS_TREE_OBJECTID, "FS_TREE" },
24 { BTRFS_CSUM_TREE_OBJECTID, "CSUM_TREE" },
25 { BTRFS_TREE_LOG_OBJECTID, "TREE_LOG" },
26 { BTRFS_QUOTA_TREE_OBJECTID, "QUOTA_TREE" },
27 { BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" },
28 { BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" },
29 { BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" },
30 { BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" },
31 };
32
btrfs_root_name(const struct btrfs_key * key,char * buf)33 const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
34 {
35 int i;
36
37 if (key->objectid == BTRFS_TREE_RELOC_OBJECTID) {
38 snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN,
39 "TREE_RELOC offset=%llu", key->offset);
40 return buf;
41 }
42
43 for (i = 0; i < ARRAY_SIZE(root_map); i++) {
44 if (root_map[i].id == key->objectid)
45 return root_map[i].name;
46 }
47
48 snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN, "%llu", key->objectid);
49 return buf;
50 }
51
print_chunk(const struct extent_buffer * eb,struct btrfs_chunk * chunk)52 static void print_chunk(const struct extent_buffer *eb, struct btrfs_chunk *chunk)
53 {
54 int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
55 int i;
56 pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
57 btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
58 btrfs_chunk_type(eb, chunk), num_stripes);
59 for (i = 0 ; i < num_stripes ; i++) {
60 pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
61 btrfs_stripe_devid_nr(eb, chunk, i),
62 btrfs_stripe_offset_nr(eb, chunk, i));
63 }
64 }
print_dev_item(const struct extent_buffer * eb,struct btrfs_dev_item * dev_item)65 static void print_dev_item(const struct extent_buffer *eb,
66 struct btrfs_dev_item *dev_item)
67 {
68 pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
69 btrfs_device_id(eb, dev_item),
70 btrfs_device_total_bytes(eb, dev_item),
71 btrfs_device_bytes_used(eb, dev_item));
72 }
print_extent_data_ref(const struct extent_buffer * eb,struct btrfs_extent_data_ref * ref)73 static void print_extent_data_ref(const struct extent_buffer *eb,
74 struct btrfs_extent_data_ref *ref)
75 {
76 pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
77 btrfs_extent_data_ref_root(eb, ref),
78 btrfs_extent_data_ref_objectid(eb, ref),
79 btrfs_extent_data_ref_offset(eb, ref),
80 btrfs_extent_data_ref_count(eb, ref));
81 }
82
print_extent_item(const struct extent_buffer * eb,int slot,int type)83 static void print_extent_item(const struct extent_buffer *eb, int slot, int type)
84 {
85 struct btrfs_extent_item *ei;
86 struct btrfs_extent_inline_ref *iref;
87 struct btrfs_extent_data_ref *dref;
88 struct btrfs_shared_data_ref *sref;
89 struct btrfs_disk_key key;
90 unsigned long end;
91 unsigned long ptr;
92 u32 item_size = btrfs_item_size(eb, slot);
93 u64 flags;
94 u64 offset;
95 int ref_index = 0;
96
97 if (unlikely(item_size < sizeof(*ei))) {
98 btrfs_err(eb->fs_info,
99 "unexpected extent item size, has %u expect >= %zu",
100 item_size, sizeof(*ei));
101 btrfs_handle_fs_error(eb->fs_info, -EUCLEAN, NULL);
102 }
103
104 ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
105 flags = btrfs_extent_flags(eb, ei);
106
107 pr_info("\t\textent refs %llu gen %llu flags %llu\n",
108 btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
109 flags);
110
111 if ((type == BTRFS_EXTENT_ITEM_KEY) &&
112 flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
113 struct btrfs_tree_block_info *info;
114 info = (struct btrfs_tree_block_info *)(ei + 1);
115 btrfs_tree_block_key(eb, info, &key);
116 pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
117 btrfs_disk_key_objectid(&key), key.type,
118 btrfs_disk_key_offset(&key),
119 btrfs_tree_block_level(eb, info));
120 iref = (struct btrfs_extent_inline_ref *)(info + 1);
121 } else {
122 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
123 }
124
125 ptr = (unsigned long)iref;
126 end = (unsigned long)ei + item_size;
127 while (ptr < end) {
128 iref = (struct btrfs_extent_inline_ref *)ptr;
129 type = btrfs_extent_inline_ref_type(eb, iref);
130 offset = btrfs_extent_inline_ref_offset(eb, iref);
131 pr_info("\t\tref#%d: ", ref_index++);
132 switch (type) {
133 case BTRFS_TREE_BLOCK_REF_KEY:
134 pr_cont("tree block backref root %llu\n", offset);
135 break;
136 case BTRFS_SHARED_BLOCK_REF_KEY:
137 pr_cont("shared block backref parent %llu\n", offset);
138 /*
139 * offset is supposed to be a tree block which
140 * must be aligned to nodesize.
141 */
142 if (!IS_ALIGNED(offset, eb->fs_info->sectorsize))
143 pr_info(
144 "\t\t\t(parent %llu not aligned to sectorsize %u)\n",
145 offset, eb->fs_info->sectorsize);
146 break;
147 case BTRFS_EXTENT_DATA_REF_KEY:
148 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
149 print_extent_data_ref(eb, dref);
150 break;
151 case BTRFS_SHARED_DATA_REF_KEY:
152 sref = (struct btrfs_shared_data_ref *)(iref + 1);
153 pr_cont("shared data backref parent %llu count %u\n",
154 offset, btrfs_shared_data_ref_count(eb, sref));
155 /*
156 * Offset is supposed to be a tree block which must be
157 * aligned to sectorsize.
158 */
159 if (!IS_ALIGNED(offset, eb->fs_info->sectorsize))
160 pr_info(
161 "\t\t\t(parent %llu not aligned to sectorsize %u)\n",
162 offset, eb->fs_info->sectorsize);
163 break;
164 default:
165 pr_cont("(extent %llu has INVALID ref type %d)\n",
166 eb->start, type);
167 return;
168 }
169 ptr += btrfs_extent_inline_ref_size(type);
170 }
171 WARN_ON(ptr > end);
172 }
173
print_uuid_item(const struct extent_buffer * l,unsigned long offset,u32 item_size)174 static void print_uuid_item(const struct extent_buffer *l, unsigned long offset,
175 u32 item_size)
176 {
177 if (!IS_ALIGNED(item_size, sizeof(u64))) {
178 pr_warn("BTRFS: uuid item with illegal size %lu!\n",
179 (unsigned long)item_size);
180 return;
181 }
182 while (item_size) {
183 __le64 subvol_id;
184
185 read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
186 pr_info("\t\tsubvol_id %llu\n", le64_to_cpu(subvol_id));
187 item_size -= sizeof(u64);
188 offset += sizeof(u64);
189 }
190 }
191
192 /*
193 * Helper to output refs and locking status of extent buffer. Useful to debug
194 * race condition related problems.
195 */
print_eb_refs_lock(const struct extent_buffer * eb)196 static void print_eb_refs_lock(const struct extent_buffer *eb)
197 {
198 #ifdef CONFIG_BTRFS_DEBUG
199 btrfs_info(eb->fs_info, "refs %u lock_owner %u current %u",
200 atomic_read(&eb->refs), eb->lock_owner, current->pid);
201 #endif
202 }
203
btrfs_print_leaf(const struct extent_buffer * l)204 void btrfs_print_leaf(const struct extent_buffer *l)
205 {
206 struct btrfs_fs_info *fs_info;
207 int i;
208 u32 type, nr;
209 struct btrfs_root_item *ri;
210 struct btrfs_dir_item *di;
211 struct btrfs_inode_item *ii;
212 struct btrfs_block_group_item *bi;
213 struct btrfs_file_extent_item *fi;
214 struct btrfs_extent_data_ref *dref;
215 struct btrfs_shared_data_ref *sref;
216 struct btrfs_dev_extent *dev_extent;
217 struct btrfs_key key;
218 struct btrfs_key found_key;
219
220 if (!l)
221 return;
222
223 fs_info = l->fs_info;
224 nr = btrfs_header_nritems(l);
225
226 btrfs_info(fs_info,
227 "leaf %llu gen %llu total ptrs %d free space %d owner %llu",
228 btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
229 btrfs_leaf_free_space(l), btrfs_header_owner(l));
230 print_eb_refs_lock(l);
231 for (i = 0 ; i < nr ; i++) {
232 btrfs_item_key_to_cpu(l, &key, i);
233 type = key.type;
234 pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
235 i, key.objectid, type, key.offset,
236 btrfs_item_offset(l, i), btrfs_item_size(l, i));
237 switch (type) {
238 case BTRFS_INODE_ITEM_KEY:
239 ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
240 pr_info("\t\tinode generation %llu size %llu mode %o\n",
241 btrfs_inode_generation(l, ii),
242 btrfs_inode_size(l, ii),
243 btrfs_inode_mode(l, ii));
244 break;
245 case BTRFS_DIR_ITEM_KEY:
246 di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
247 btrfs_dir_item_key_to_cpu(l, di, &found_key);
248 pr_info("\t\tdir oid %llu flags %u\n",
249 found_key.objectid,
250 btrfs_dir_flags(l, di));
251 break;
252 case BTRFS_ROOT_ITEM_KEY:
253 ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
254 pr_info("\t\troot data bytenr %llu refs %u\n",
255 btrfs_disk_root_bytenr(l, ri),
256 btrfs_disk_root_refs(l, ri));
257 break;
258 case BTRFS_EXTENT_ITEM_KEY:
259 case BTRFS_METADATA_ITEM_KEY:
260 print_extent_item(l, i, type);
261 break;
262 case BTRFS_TREE_BLOCK_REF_KEY:
263 pr_info("\t\ttree block backref\n");
264 break;
265 case BTRFS_SHARED_BLOCK_REF_KEY:
266 pr_info("\t\tshared block backref\n");
267 break;
268 case BTRFS_EXTENT_DATA_REF_KEY:
269 dref = btrfs_item_ptr(l, i,
270 struct btrfs_extent_data_ref);
271 print_extent_data_ref(l, dref);
272 break;
273 case BTRFS_SHARED_DATA_REF_KEY:
274 sref = btrfs_item_ptr(l, i,
275 struct btrfs_shared_data_ref);
276 pr_info("\t\tshared data backref count %u\n",
277 btrfs_shared_data_ref_count(l, sref));
278 break;
279 case BTRFS_EXTENT_DATA_KEY:
280 fi = btrfs_item_ptr(l, i,
281 struct btrfs_file_extent_item);
282 if (btrfs_file_extent_type(l, fi) ==
283 BTRFS_FILE_EXTENT_INLINE) {
284 pr_info("\t\tinline extent data size %llu\n",
285 btrfs_file_extent_ram_bytes(l, fi));
286 break;
287 }
288 pr_info("\t\textent data disk bytenr %llu nr %llu\n",
289 btrfs_file_extent_disk_bytenr(l, fi),
290 btrfs_file_extent_disk_num_bytes(l, fi));
291 pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
292 btrfs_file_extent_offset(l, fi),
293 btrfs_file_extent_num_bytes(l, fi),
294 btrfs_file_extent_ram_bytes(l, fi));
295 break;
296 case BTRFS_BLOCK_GROUP_ITEM_KEY:
297 bi = btrfs_item_ptr(l, i,
298 struct btrfs_block_group_item);
299 pr_info(
300 "\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
301 btrfs_block_group_used(l, bi),
302 btrfs_block_group_chunk_objectid(l, bi),
303 btrfs_block_group_flags(l, bi));
304 break;
305 case BTRFS_CHUNK_ITEM_KEY:
306 print_chunk(l, btrfs_item_ptr(l, i,
307 struct btrfs_chunk));
308 break;
309 case BTRFS_DEV_ITEM_KEY:
310 print_dev_item(l, btrfs_item_ptr(l, i,
311 struct btrfs_dev_item));
312 break;
313 case BTRFS_DEV_EXTENT_KEY:
314 dev_extent = btrfs_item_ptr(l, i,
315 struct btrfs_dev_extent);
316 pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
317 btrfs_dev_extent_chunk_tree(l, dev_extent),
318 btrfs_dev_extent_chunk_objectid(l, dev_extent),
319 btrfs_dev_extent_chunk_offset(l, dev_extent),
320 btrfs_dev_extent_length(l, dev_extent));
321 break;
322 case BTRFS_PERSISTENT_ITEM_KEY:
323 pr_info("\t\tpersistent item objectid %llu offset %llu\n",
324 key.objectid, key.offset);
325 switch (key.objectid) {
326 case BTRFS_DEV_STATS_OBJECTID:
327 pr_info("\t\tdevice stats\n");
328 break;
329 default:
330 pr_info("\t\tunknown persistent item\n");
331 }
332 break;
333 case BTRFS_TEMPORARY_ITEM_KEY:
334 pr_info("\t\ttemporary item objectid %llu offset %llu\n",
335 key.objectid, key.offset);
336 switch (key.objectid) {
337 case BTRFS_BALANCE_OBJECTID:
338 pr_info("\t\tbalance status\n");
339 break;
340 default:
341 pr_info("\t\tunknown temporary item\n");
342 }
343 break;
344 case BTRFS_DEV_REPLACE_KEY:
345 pr_info("\t\tdev replace\n");
346 break;
347 case BTRFS_UUID_KEY_SUBVOL:
348 case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
349 print_uuid_item(l, btrfs_item_ptr_offset(l, i),
350 btrfs_item_size(l, i));
351 break;
352 }
353 }
354 }
355
btrfs_print_tree(const struct extent_buffer * c,bool follow)356 void btrfs_print_tree(const struct extent_buffer *c, bool follow)
357 {
358 struct btrfs_fs_info *fs_info;
359 int i; u32 nr;
360 struct btrfs_key key;
361 int level;
362
363 if (!c)
364 return;
365 fs_info = c->fs_info;
366 nr = btrfs_header_nritems(c);
367 level = btrfs_header_level(c);
368 if (level == 0) {
369 btrfs_print_leaf(c);
370 return;
371 }
372 btrfs_info(fs_info,
373 "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
374 btrfs_header_bytenr(c), level, btrfs_header_generation(c),
375 nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
376 btrfs_header_owner(c));
377 print_eb_refs_lock(c);
378 for (i = 0; i < nr; i++) {
379 btrfs_node_key_to_cpu(c, &key, i);
380 pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n",
381 i, key.objectid, key.type, key.offset,
382 btrfs_node_blockptr(c, i),
383 btrfs_node_ptr_generation(c, i));
384 }
385 if (!follow)
386 return;
387 for (i = 0; i < nr; i++) {
388 struct btrfs_tree_parent_check check = {
389 .level = level - 1,
390 .transid = btrfs_node_ptr_generation(c, i),
391 .owner_root = btrfs_header_owner(c),
392 .has_first_key = true
393 };
394 struct extent_buffer *next;
395
396 btrfs_node_key_to_cpu(c, &check.first_key, i);
397 next = read_tree_block(fs_info, btrfs_node_blockptr(c, i), &check);
398 if (IS_ERR(next))
399 continue;
400 if (!extent_buffer_uptodate(next)) {
401 free_extent_buffer(next);
402 continue;
403 }
404
405 if (btrfs_is_leaf(next) &&
406 level != 1)
407 BUG();
408 if (btrfs_header_level(next) !=
409 level - 1)
410 BUG();
411 btrfs_print_tree(next, follow);
412 free_extent_buffer(next);
413 }
414 }
415