btrfs: Add graceful handling of V0 extents
[sfrench/cifs-2.6.git] / fs / btrfs / print-tree.c
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                 btrfs_print_v0_err(eb->fs_info);
57                 btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
58         }
59
60         ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
61         flags = btrfs_extent_flags(eb, ei);
62
63         pr_info("\t\textent refs %llu gen %llu flags %llu\n",
64                btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
65                flags);
66
67         if ((type == BTRFS_EXTENT_ITEM_KEY) &&
68             flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
69                 struct btrfs_tree_block_info *info;
70                 info = (struct btrfs_tree_block_info *)(ei + 1);
71                 btrfs_tree_block_key(eb, info, &key);
72                 pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
73                        btrfs_disk_key_objectid(&key), key.type,
74                        btrfs_disk_key_offset(&key),
75                        btrfs_tree_block_level(eb, info));
76                 iref = (struct btrfs_extent_inline_ref *)(info + 1);
77         } else {
78                 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
79         }
80
81         ptr = (unsigned long)iref;
82         end = (unsigned long)ei + item_size;
83         while (ptr < end) {
84                 iref = (struct btrfs_extent_inline_ref *)ptr;
85                 type = btrfs_extent_inline_ref_type(eb, iref);
86                 offset = btrfs_extent_inline_ref_offset(eb, iref);
87                 pr_info("\t\tref#%d: ", ref_index++);
88                 switch (type) {
89                 case BTRFS_TREE_BLOCK_REF_KEY:
90                         pr_cont("tree block backref root %llu\n", offset);
91                         break;
92                 case BTRFS_SHARED_BLOCK_REF_KEY:
93                         pr_cont("shared block backref parent %llu\n", offset);
94                         /*
95                          * offset is supposed to be a tree block which
96                          * must be aligned to nodesize.
97                          */
98                         if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
99                                 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
100                                         offset, (unsigned long long)eb->fs_info->nodesize);
101                         break;
102                 case BTRFS_EXTENT_DATA_REF_KEY:
103                         dref = (struct btrfs_extent_data_ref *)(&iref->offset);
104                         print_extent_data_ref(eb, dref);
105                         break;
106                 case BTRFS_SHARED_DATA_REF_KEY:
107                         sref = (struct btrfs_shared_data_ref *)(iref + 1);
108                         pr_cont("shared data backref parent %llu count %u\n",
109                                offset, btrfs_shared_data_ref_count(eb, sref));
110                         /*
111                          * offset is supposed to be a tree block which
112                          * must be aligned to nodesize.
113                          */
114                         if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
115                                 pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
116                                      offset, (unsigned long long)eb->fs_info->nodesize);
117                         break;
118                 default:
119                         pr_cont("(extent %llu has INVALID ref type %d)\n",
120                                   eb->start, type);
121                         return;
122                 }
123                 ptr += btrfs_extent_inline_ref_size(type);
124         }
125         WARN_ON(ptr > end);
126 }
127
128 static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
129                             u32 item_size)
130 {
131         if (!IS_ALIGNED(item_size, sizeof(u64))) {
132                 pr_warn("BTRFS: uuid item with illegal size %lu!\n",
133                         (unsigned long)item_size);
134                 return;
135         }
136         while (item_size) {
137                 __le64 subvol_id;
138
139                 read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
140                 pr_info("\t\tsubvol_id %llu\n",
141                        (unsigned long long)le64_to_cpu(subvol_id));
142                 item_size -= sizeof(u64);
143                 offset += sizeof(u64);
144         }
145 }
146
147 /*
148  * Helper to output refs and locking status of extent buffer.  Useful to debug
149  * race condition related problems.
150  */
151 static void print_eb_refs_lock(struct extent_buffer *eb)
152 {
153 #ifdef CONFIG_BTRFS_DEBUG
154         btrfs_info(eb->fs_info,
155 "refs %u lock (w:%d r:%d bw:%d br:%d sw:%d sr:%d) lock_owner %u current %u",
156                    atomic_read(&eb->refs), atomic_read(&eb->write_locks),
157                    atomic_read(&eb->read_locks),
158                    atomic_read(&eb->blocking_writers),
159                    atomic_read(&eb->blocking_readers),
160                    atomic_read(&eb->spinning_writers),
161                    atomic_read(&eb->spinning_readers),
162                    eb->lock_owner, current->pid);
163 #endif
164 }
165
166 void btrfs_print_leaf(struct extent_buffer *l)
167 {
168         struct btrfs_fs_info *fs_info;
169         int i;
170         u32 type, nr;
171         struct btrfs_item *item;
172         struct btrfs_root_item *ri;
173         struct btrfs_dir_item *di;
174         struct btrfs_inode_item *ii;
175         struct btrfs_block_group_item *bi;
176         struct btrfs_file_extent_item *fi;
177         struct btrfs_extent_data_ref *dref;
178         struct btrfs_shared_data_ref *sref;
179         struct btrfs_dev_extent *dev_extent;
180         struct btrfs_key key;
181         struct btrfs_key found_key;
182
183         if (!l)
184                 return;
185
186         fs_info = l->fs_info;
187         nr = btrfs_header_nritems(l);
188
189         btrfs_info(fs_info,
190                    "leaf %llu gen %llu total ptrs %d free space %d owner %llu",
191                    btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
192                    btrfs_leaf_free_space(fs_info, l), btrfs_header_owner(l));
193         print_eb_refs_lock(l);
194         for (i = 0 ; i < nr ; i++) {
195                 item = btrfs_item_nr(i);
196                 btrfs_item_key_to_cpu(l, &key, i);
197                 type = key.type;
198                 pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
199                         i, key.objectid, type, key.offset,
200                         btrfs_item_offset(l, item), btrfs_item_size(l, item));
201                 switch (type) {
202                 case BTRFS_INODE_ITEM_KEY:
203                         ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
204                         pr_info("\t\tinode generation %llu size %llu mode %o\n",
205                                btrfs_inode_generation(l, ii),
206                                btrfs_inode_size(l, ii),
207                                btrfs_inode_mode(l, ii));
208                         break;
209                 case BTRFS_DIR_ITEM_KEY:
210                         di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
211                         btrfs_dir_item_key_to_cpu(l, di, &found_key);
212                         pr_info("\t\tdir oid %llu type %u\n",
213                                 found_key.objectid,
214                                 btrfs_dir_type(l, di));
215                         break;
216                 case BTRFS_ROOT_ITEM_KEY:
217                         ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
218                         pr_info("\t\troot data bytenr %llu refs %u\n",
219                                 btrfs_disk_root_bytenr(l, ri),
220                                 btrfs_disk_root_refs(l, ri));
221                         break;
222                 case BTRFS_EXTENT_ITEM_KEY:
223                 case BTRFS_METADATA_ITEM_KEY:
224                         print_extent_item(l, i, type);
225                         break;
226                 case BTRFS_TREE_BLOCK_REF_KEY:
227                         pr_info("\t\ttree block backref\n");
228                         break;
229                 case BTRFS_SHARED_BLOCK_REF_KEY:
230                         pr_info("\t\tshared block backref\n");
231                         break;
232                 case BTRFS_EXTENT_DATA_REF_KEY:
233                         dref = btrfs_item_ptr(l, i,
234                                               struct btrfs_extent_data_ref);
235                         print_extent_data_ref(l, dref);
236                         break;
237                 case BTRFS_SHARED_DATA_REF_KEY:
238                         sref = btrfs_item_ptr(l, i,
239                                               struct btrfs_shared_data_ref);
240                         pr_info("\t\tshared data backref count %u\n",
241                                btrfs_shared_data_ref_count(l, sref));
242                         break;
243                 case BTRFS_EXTENT_DATA_KEY:
244                         fi = btrfs_item_ptr(l, i,
245                                             struct btrfs_file_extent_item);
246                         if (btrfs_file_extent_type(l, fi) ==
247                             BTRFS_FILE_EXTENT_INLINE) {
248                                 pr_info("\t\tinline extent data size %llu\n",
249                                        btrfs_file_extent_ram_bytes(l, fi));
250                                 break;
251                         }
252                         pr_info("\t\textent data disk bytenr %llu nr %llu\n",
253                                btrfs_file_extent_disk_bytenr(l, fi),
254                                btrfs_file_extent_disk_num_bytes(l, fi));
255                         pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
256                                btrfs_file_extent_offset(l, fi),
257                                btrfs_file_extent_num_bytes(l, fi),
258                                btrfs_file_extent_ram_bytes(l, fi));
259                         break;
260                 case BTRFS_EXTENT_REF_V0_KEY:
261                         btrfs_print_v0_err(fs_info);
262                         btrfs_handle_fs_error(fs_info, -EINVAL, NULL);
263                         break;
264                 case BTRFS_BLOCK_GROUP_ITEM_KEY:
265                         bi = btrfs_item_ptr(l, i,
266                                             struct btrfs_block_group_item);
267                         pr_info(
268                    "\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
269                                 btrfs_disk_block_group_used(l, bi),
270                                 btrfs_disk_block_group_chunk_objectid(l, bi),
271                                 btrfs_disk_block_group_flags(l, bi));
272                         break;
273                 case BTRFS_CHUNK_ITEM_KEY:
274                         print_chunk(l, btrfs_item_ptr(l, i,
275                                                       struct btrfs_chunk));
276                         break;
277                 case BTRFS_DEV_ITEM_KEY:
278                         print_dev_item(l, btrfs_item_ptr(l, i,
279                                         struct btrfs_dev_item));
280                         break;
281                 case BTRFS_DEV_EXTENT_KEY:
282                         dev_extent = btrfs_item_ptr(l, i,
283                                                     struct btrfs_dev_extent);
284                         pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
285                                btrfs_dev_extent_chunk_tree(l, dev_extent),
286                                btrfs_dev_extent_chunk_objectid(l, dev_extent),
287                                btrfs_dev_extent_chunk_offset(l, dev_extent),
288                                btrfs_dev_extent_length(l, dev_extent));
289                         break;
290                 case BTRFS_PERSISTENT_ITEM_KEY:
291                         pr_info("\t\tpersistent item objectid %llu offset %llu\n",
292                                         key.objectid, key.offset);
293                         switch (key.objectid) {
294                         case BTRFS_DEV_STATS_OBJECTID:
295                                 pr_info("\t\tdevice stats\n");
296                                 break;
297                         default:
298                                 pr_info("\t\tunknown persistent item\n");
299                         }
300                         break;
301                 case BTRFS_TEMPORARY_ITEM_KEY:
302                         pr_info("\t\ttemporary item objectid %llu offset %llu\n",
303                                         key.objectid, key.offset);
304                         switch (key.objectid) {
305                         case BTRFS_BALANCE_OBJECTID:
306                                 pr_info("\t\tbalance status\n");
307                                 break;
308                         default:
309                                 pr_info("\t\tunknown temporary item\n");
310                         }
311                         break;
312                 case BTRFS_DEV_REPLACE_KEY:
313                         pr_info("\t\tdev replace\n");
314                         break;
315                 case BTRFS_UUID_KEY_SUBVOL:
316                 case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
317                         print_uuid_item(l, btrfs_item_ptr_offset(l, i),
318                                         btrfs_item_size_nr(l, i));
319                         break;
320                 };
321         }
322 }
323
324 void btrfs_print_tree(struct extent_buffer *c, bool follow)
325 {
326         struct btrfs_fs_info *fs_info;
327         int i; u32 nr;
328         struct btrfs_key key;
329         int level;
330
331         if (!c)
332                 return;
333         fs_info = c->fs_info;
334         nr = btrfs_header_nritems(c);
335         level = btrfs_header_level(c);
336         if (level == 0) {
337                 btrfs_print_leaf(c);
338                 return;
339         }
340         btrfs_info(fs_info,
341                    "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
342                    btrfs_header_bytenr(c), level, btrfs_header_generation(c),
343                    nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
344                    btrfs_header_owner(c));
345         print_eb_refs_lock(c);
346         for (i = 0; i < nr; i++) {
347                 btrfs_node_key_to_cpu(c, &key, i);
348                 pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n",
349                        i, key.objectid, key.type, key.offset,
350                        btrfs_node_blockptr(c, i),
351                        btrfs_node_ptr_generation(c, i));
352         }
353         if (!follow)
354                 return;
355         for (i = 0; i < nr; i++) {
356                 struct btrfs_key first_key;
357                 struct extent_buffer *next;
358
359                 btrfs_node_key_to_cpu(c, &first_key, i);
360                 next = read_tree_block(fs_info, btrfs_node_blockptr(c, i),
361                                        btrfs_node_ptr_generation(c, i),
362                                        level - 1, &first_key);
363                 if (IS_ERR(next)) {
364                         continue;
365                 } else if (!extent_buffer_uptodate(next)) {
366                         free_extent_buffer(next);
367                         continue;
368                 }
369
370                 if (btrfs_is_leaf(next) &&
371                    level != 1)
372                         BUG();
373                 if (btrfs_header_level(next) !=
374                        level - 1)
375                         BUG();
376                 btrfs_print_tree(next, follow);
377                 free_extent_buffer(next);
378         }
379 }