1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #include "ctree.h" 7 #include "disk-io.h" 8 #include "print-tree.h" 9 10 static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk) 11 { 12 int num_stripes = btrfs_chunk_num_stripes(eb, chunk); 13 int i; 14 pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n", 15 btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk), 16 btrfs_chunk_type(eb, chunk), num_stripes); 17 for (i = 0 ; i < num_stripes ; i++) { 18 pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i, 19 btrfs_stripe_devid_nr(eb, chunk, i), 20 btrfs_stripe_offset_nr(eb, chunk, i)); 21 } 22 } 23 static void print_dev_item(struct extent_buffer *eb, 24 struct btrfs_dev_item *dev_item) 25 { 26 pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n", 27 btrfs_device_id(eb, dev_item), 28 btrfs_device_total_bytes(eb, dev_item), 29 btrfs_device_bytes_used(eb, dev_item)); 30 } 31 static void print_extent_data_ref(struct extent_buffer *eb, 32 struct btrfs_extent_data_ref *ref) 33 { 34 pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n", 35 btrfs_extent_data_ref_root(eb, ref), 36 btrfs_extent_data_ref_objectid(eb, ref), 37 btrfs_extent_data_ref_offset(eb, ref), 38 btrfs_extent_data_ref_count(eb, ref)); 39 } 40 41 static void print_extent_item(struct extent_buffer *eb, int slot, int type) 42 { 43 struct btrfs_extent_item *ei; 44 struct btrfs_extent_inline_ref *iref; 45 struct btrfs_extent_data_ref *dref; 46 struct btrfs_shared_data_ref *sref; 47 struct btrfs_disk_key key; 48 unsigned long end; 49 unsigned long ptr; 50 u32 item_size = btrfs_item_size_nr(eb, slot); 51 u64 flags; 52 u64 offset; 53 int ref_index = 0; 54 55 if (item_size < sizeof(*ei)) 56 BUG(); 57 58 ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); 59 flags = btrfs_extent_flags(eb, ei); 60 61 pr_info("\t\textent refs %llu gen %llu flags %llu\n", 62 btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei), 63 flags); 64 65 if ((type == BTRFS_EXTENT_ITEM_KEY) && 66 flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 67 struct btrfs_tree_block_info *info; 68 info = (struct btrfs_tree_block_info *)(ei + 1); 69 btrfs_tree_block_key(eb, info, &key); 70 pr_info("\t\ttree block key (%llu %u %llu) level %d\n", 71 btrfs_disk_key_objectid(&key), key.type, 72 btrfs_disk_key_offset(&key), 73 btrfs_tree_block_level(eb, info)); 74 iref = (struct btrfs_extent_inline_ref *)(info + 1); 75 } else { 76 iref = (struct btrfs_extent_inline_ref *)(ei + 1); 77 } 78 79 ptr = (unsigned long)iref; 80 end = (unsigned long)ei + item_size; 81 while (ptr < end) { 82 iref = (struct btrfs_extent_inline_ref *)ptr; 83 type = btrfs_extent_inline_ref_type(eb, iref); 84 offset = btrfs_extent_inline_ref_offset(eb, iref); 85 pr_info("\t\tref#%d: ", ref_index++); 86 switch (type) { 87 case BTRFS_TREE_BLOCK_REF_KEY: 88 pr_cont("tree block backref root %llu\n", offset); 89 break; 90 case BTRFS_SHARED_BLOCK_REF_KEY: 91 pr_cont("shared block backref parent %llu\n", offset); 92 /* 93 * offset is supposed to be a tree block which 94 * must be aligned to nodesize. 95 */ 96 if (!IS_ALIGNED(offset, eb->fs_info->nodesize)) 97 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n", 98 offset, (unsigned long long)eb->fs_info->nodesize); 99 break; 100 case BTRFS_EXTENT_DATA_REF_KEY: 101 dref = (struct btrfs_extent_data_ref *)(&iref->offset); 102 print_extent_data_ref(eb, dref); 103 break; 104 case BTRFS_SHARED_DATA_REF_KEY: 105 sref = (struct btrfs_shared_data_ref *)(iref + 1); 106 pr_cont("shared data backref parent %llu count %u\n", 107 offset, btrfs_shared_data_ref_count(eb, sref)); 108 /* 109 * offset is supposed to be a tree block which 110 * must be aligned to nodesize. 111 */ 112 if (!IS_ALIGNED(offset, eb->fs_info->nodesize)) 113 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n", 114 offset, (unsigned long long)eb->fs_info->nodesize); 115 break; 116 default: 117 pr_cont("(extent %llu has INVALID ref type %d)\n", 118 eb->start, type); 119 return; 120 } 121 ptr += btrfs_extent_inline_ref_size(type); 122 } 123 WARN_ON(ptr > end); 124 } 125 126 static void print_uuid_item(struct extent_buffer *l, unsigned long offset, 127 u32 item_size) 128 { 129 if (!IS_ALIGNED(item_size, sizeof(u64))) { 130 pr_warn("BTRFS: uuid item with illegal size %lu!\n", 131 (unsigned long)item_size); 132 return; 133 } 134 while (item_size) { 135 __le64 subvol_id; 136 137 read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id)); 138 pr_info("\t\tsubvol_id %llu\n", 139 (unsigned long long)le64_to_cpu(subvol_id)); 140 item_size -= sizeof(u64); 141 offset += sizeof(u64); 142 } 143 } 144 145 /* 146 * Helper to output refs and locking status of extent buffer. Useful to debug 147 * race condition related problems. 148 */ 149 static void print_eb_refs_lock(struct extent_buffer *eb) 150 { 151 #ifdef CONFIG_BTRFS_DEBUG 152 btrfs_info(eb->fs_info, 153 "refs %u lock (w:%d r:%d bw:%d br:%d sw:%d sr:%d) lock_owner %u current %u", 154 atomic_read(&eb->refs), atomic_read(&eb->write_locks), 155 atomic_read(&eb->read_locks), 156 atomic_read(&eb->blocking_writers), 157 atomic_read(&eb->blocking_readers), 158 atomic_read(&eb->spinning_writers), 159 atomic_read(&eb->spinning_readers), 160 eb->lock_owner, current->pid); 161 #endif 162 } 163 164 void btrfs_print_leaf(struct extent_buffer *l) 165 { 166 struct btrfs_fs_info *fs_info; 167 int i; 168 u32 type, nr; 169 struct btrfs_item *item; 170 struct btrfs_root_item *ri; 171 struct btrfs_dir_item *di; 172 struct btrfs_inode_item *ii; 173 struct btrfs_block_group_item *bi; 174 struct btrfs_file_extent_item *fi; 175 struct btrfs_extent_data_ref *dref; 176 struct btrfs_shared_data_ref *sref; 177 struct btrfs_dev_extent *dev_extent; 178 struct btrfs_key key; 179 struct btrfs_key found_key; 180 181 if (!l) 182 return; 183 184 fs_info = l->fs_info; 185 nr = btrfs_header_nritems(l); 186 187 btrfs_info(fs_info, 188 "leaf %llu gen %llu total ptrs %d free space %d owner %llu", 189 btrfs_header_bytenr(l), btrfs_header_generation(l), nr, 190 btrfs_leaf_free_space(fs_info, l), btrfs_header_owner(l)); 191 print_eb_refs_lock(l); 192 for (i = 0 ; i < nr ; i++) { 193 item = btrfs_item_nr(i); 194 btrfs_item_key_to_cpu(l, &key, i); 195 type = key.type; 196 pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n", 197 i, key.objectid, type, key.offset, 198 btrfs_item_offset(l, item), btrfs_item_size(l, item)); 199 switch (type) { 200 case BTRFS_INODE_ITEM_KEY: 201 ii = btrfs_item_ptr(l, i, struct btrfs_inode_item); 202 pr_info("\t\tinode generation %llu size %llu mode %o\n", 203 btrfs_inode_generation(l, ii), 204 btrfs_inode_size(l, ii), 205 btrfs_inode_mode(l, ii)); 206 break; 207 case BTRFS_DIR_ITEM_KEY: 208 di = btrfs_item_ptr(l, i, struct btrfs_dir_item); 209 btrfs_dir_item_key_to_cpu(l, di, &found_key); 210 pr_info("\t\tdir oid %llu type %u\n", 211 found_key.objectid, 212 btrfs_dir_type(l, di)); 213 break; 214 case BTRFS_ROOT_ITEM_KEY: 215 ri = btrfs_item_ptr(l, i, struct btrfs_root_item); 216 pr_info("\t\troot data bytenr %llu refs %u\n", 217 btrfs_disk_root_bytenr(l, ri), 218 btrfs_disk_root_refs(l, ri)); 219 break; 220 case BTRFS_EXTENT_ITEM_KEY: 221 case BTRFS_METADATA_ITEM_KEY: 222 print_extent_item(l, i, type); 223 break; 224 case BTRFS_TREE_BLOCK_REF_KEY: 225 pr_info("\t\ttree block backref\n"); 226 break; 227 case BTRFS_SHARED_BLOCK_REF_KEY: 228 pr_info("\t\tshared block backref\n"); 229 break; 230 case BTRFS_EXTENT_DATA_REF_KEY: 231 dref = btrfs_item_ptr(l, i, 232 struct btrfs_extent_data_ref); 233 print_extent_data_ref(l, dref); 234 break; 235 case BTRFS_SHARED_DATA_REF_KEY: 236 sref = btrfs_item_ptr(l, i, 237 struct btrfs_shared_data_ref); 238 pr_info("\t\tshared data backref count %u\n", 239 btrfs_shared_data_ref_count(l, sref)); 240 break; 241 case BTRFS_EXTENT_DATA_KEY: 242 fi = btrfs_item_ptr(l, i, 243 struct btrfs_file_extent_item); 244 if (btrfs_file_extent_type(l, fi) == 245 BTRFS_FILE_EXTENT_INLINE) { 246 pr_info("\t\tinline extent data size %llu\n", 247 btrfs_file_extent_ram_bytes(l, fi)); 248 break; 249 } 250 pr_info("\t\textent data disk bytenr %llu nr %llu\n", 251 btrfs_file_extent_disk_bytenr(l, fi), 252 btrfs_file_extent_disk_num_bytes(l, fi)); 253 pr_info("\t\textent data offset %llu nr %llu ram %llu\n", 254 btrfs_file_extent_offset(l, fi), 255 btrfs_file_extent_num_bytes(l, fi), 256 btrfs_file_extent_ram_bytes(l, fi)); 257 break; 258 case BTRFS_EXTENT_REF_V0_KEY: 259 BUG(); 260 break; 261 case BTRFS_BLOCK_GROUP_ITEM_KEY: 262 bi = btrfs_item_ptr(l, i, 263 struct btrfs_block_group_item); 264 pr_info( 265 "\t\tblock group used %llu chunk_objectid %llu flags %llu\n", 266 btrfs_disk_block_group_used(l, bi), 267 btrfs_disk_block_group_chunk_objectid(l, bi), 268 btrfs_disk_block_group_flags(l, bi)); 269 break; 270 case BTRFS_CHUNK_ITEM_KEY: 271 print_chunk(l, btrfs_item_ptr(l, i, 272 struct btrfs_chunk)); 273 break; 274 case BTRFS_DEV_ITEM_KEY: 275 print_dev_item(l, btrfs_item_ptr(l, i, 276 struct btrfs_dev_item)); 277 break; 278 case BTRFS_DEV_EXTENT_KEY: 279 dev_extent = btrfs_item_ptr(l, i, 280 struct btrfs_dev_extent); 281 pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n", 282 btrfs_dev_extent_chunk_tree(l, dev_extent), 283 btrfs_dev_extent_chunk_objectid(l, dev_extent), 284 btrfs_dev_extent_chunk_offset(l, dev_extent), 285 btrfs_dev_extent_length(l, dev_extent)); 286 break; 287 case BTRFS_PERSISTENT_ITEM_KEY: 288 pr_info("\t\tpersistent item objectid %llu offset %llu\n", 289 key.objectid, key.offset); 290 switch (key.objectid) { 291 case BTRFS_DEV_STATS_OBJECTID: 292 pr_info("\t\tdevice stats\n"); 293 break; 294 default: 295 pr_info("\t\tunknown persistent item\n"); 296 } 297 break; 298 case BTRFS_TEMPORARY_ITEM_KEY: 299 pr_info("\t\ttemporary item objectid %llu offset %llu\n", 300 key.objectid, key.offset); 301 switch (key.objectid) { 302 case BTRFS_BALANCE_OBJECTID: 303 pr_info("\t\tbalance status\n"); 304 break; 305 default: 306 pr_info("\t\tunknown temporary item\n"); 307 } 308 break; 309 case BTRFS_DEV_REPLACE_KEY: 310 pr_info("\t\tdev replace\n"); 311 break; 312 case BTRFS_UUID_KEY_SUBVOL: 313 case BTRFS_UUID_KEY_RECEIVED_SUBVOL: 314 print_uuid_item(l, btrfs_item_ptr_offset(l, i), 315 btrfs_item_size_nr(l, i)); 316 break; 317 }; 318 } 319 } 320 321 void btrfs_print_tree(struct extent_buffer *c, bool follow) 322 { 323 struct btrfs_fs_info *fs_info; 324 int i; u32 nr; 325 struct btrfs_key key; 326 int level; 327 328 if (!c) 329 return; 330 fs_info = c->fs_info; 331 nr = btrfs_header_nritems(c); 332 level = btrfs_header_level(c); 333 if (level == 0) { 334 btrfs_print_leaf(c); 335 return; 336 } 337 btrfs_info(fs_info, 338 "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu", 339 btrfs_header_bytenr(c), level, btrfs_header_generation(c), 340 nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr, 341 btrfs_header_owner(c)); 342 print_eb_refs_lock(c); 343 for (i = 0; i < nr; i++) { 344 btrfs_node_key_to_cpu(c, &key, i); 345 pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n", 346 i, key.objectid, key.type, key.offset, 347 btrfs_node_blockptr(c, i), 348 btrfs_node_ptr_generation(c, i)); 349 } 350 if (!follow) 351 return; 352 for (i = 0; i < nr; i++) { 353 struct btrfs_key first_key; 354 struct extent_buffer *next; 355 356 btrfs_node_key_to_cpu(c, &first_key, i); 357 next = read_tree_block(fs_info, btrfs_node_blockptr(c, i), 358 btrfs_node_ptr_generation(c, i), 359 level - 1, &first_key); 360 if (IS_ERR(next)) { 361 continue; 362 } else if (!extent_buffer_uptodate(next)) { 363 free_extent_buffer(next); 364 continue; 365 } 366 367 if (btrfs_is_leaf(next) && 368 level != 1) 369 BUG(); 370 if (btrfs_header_level(next) != 371 level - 1) 372 BUG(); 373 btrfs_print_tree(next, follow); 374 free_extent_buffer(next); 375 } 376 } 377