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1/*
2 * Copyright (C) STRATO AG 2011. All rights reserved.
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/*
20 * This module can be used to catch cases when the btrfs kernel
21 * code executes write requests to the disk that bring the file
22 * system in an inconsistent state. In such a state, a power-loss
23 * or kernel panic event would cause that the data on disk is
24 * lost or at least damaged.
25 *
26 * Code is added that examines all block write requests during
27 * runtime (including writes of the super block). Three rules
28 * are verified and an error is printed on violation of the
29 * rules:
30 * 1. It is not allowed to write a disk block which is
31 * currently referenced by the super block (either directly
32 * or indirectly).
33 * 2. When a super block is written, it is verified that all
34 * referenced (directly or indirectly) blocks fulfill the
35 * following requirements:
36 * 2a. All referenced blocks have either been present when
37 * the file system was mounted, (i.e., they have been
38 * referenced by the super block) or they have been
39 * written since then and the write completion callback
40 * was called and no write error was indicated and a
41 * FLUSH request to the device where these blocks are
42 * located was received and completed.
43 * 2b. All referenced blocks need to have a generation
44 * number which is equal to the parent's number.
45 *
46 * One issue that was found using this module was that the log
47 * tree on disk became temporarily corrupted because disk blocks
48 * that had been in use for the log tree had been freed and
49 * reused too early, while being referenced by the written super
50 * block.
51 *
52 * The search term in the kernel log that can be used to filter
53 * on the existence of detected integrity issues is
54 * "btrfs: attempt".
55 *
56 * The integrity check is enabled via mount options. These
57 * mount options are only supported if the integrity check
58 * tool is compiled by defining BTRFS_FS_CHECK_INTEGRITY.
59 *
60 * Example #1, apply integrity checks to all metadata:
61 * mount /dev/sdb1 /mnt -o check_int
62 *
63 * Example #2, apply integrity checks to all metadata and
64 * to data extents:
65 * mount /dev/sdb1 /mnt -o check_int_data
66 *
67 * Example #3, apply integrity checks to all metadata and dump
68 * the tree that the super block references to kernel messages
69 * each time after a super block was written:
70 * mount /dev/sdb1 /mnt -o check_int,check_int_print_mask=263
71 *
72 * If the integrity check tool is included and activated in
73 * the mount options, plenty of kernel memory is used, and
74 * plenty of additional CPU cycles are spent. Enabling this
75 * functionality is not intended for normal use. In most
76 * cases, unless you are a btrfs developer who needs to verify
77 * the integrity of (super)-block write requests, do not
78 * enable the config option BTRFS_FS_CHECK_INTEGRITY to
79 * include and compile the integrity check tool.
80 *
81 * Expect millions of lines of information in the kernel log with an
82 * enabled check_int_print_mask. Therefore set LOG_BUF_SHIFT in the
83 * kernel config to at least 26 (which is 64MB). Usually the value is
84 * limited to 21 (which is 2MB) in init/Kconfig. The file needs to be
85 * changed like this before LOG_BUF_SHIFT can be set to a high value:
86 * config LOG_BUF_SHIFT
87 * int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
88 * range 12 30
89 */
90
91#include <linux/sched.h>
92#include <linux/slab.h>
93#include <linux/buffer_head.h>
94#include <linux/mutex.h>
95#include <linux/genhd.h>
96#include <linux/blkdev.h>
97#include <linux/vmalloc.h>
98#include <linux/string.h>
99#include "ctree.h"
100#include "disk-io.h"
101#include "hash.h"
102#include "transaction.h"
103#include "extent_io.h"
104#include "volumes.h"
105#include "print-tree.h"
106#include "locking.h"
107#include "check-integrity.h"
108#include "rcu-string.h"
109#include "compression.h"
110
111#define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000
112#define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000
113#define BTRFSIC_DEV2STATE_HASHTABLE_SIZE 0x100
114#define BTRFSIC_BLOCK_MAGIC_NUMBER 0x14491051
115#define BTRFSIC_BLOCK_LINK_MAGIC_NUMBER 0x11070807
116#define BTRFSIC_DEV2STATE_MAGIC_NUMBER 0x20111530
117#define BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER 20111300
118#define BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL (200 - 6) /* in characters,
119 * excluding " [...]" */
120#define BTRFSIC_GENERATION_UNKNOWN ((u64)-1)
121
122/*
123 * The definition of the bitmask fields for the print_mask.
124 * They are specified with the mount option check_integrity_print_mask.
125 */
126#define BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE 0x00000001
127#define BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION 0x00000002
128#define BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE 0x00000004
129#define BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE 0x00000008
130#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH 0x00000010
131#define BTRFSIC_PRINT_MASK_END_IO_BIO_BH 0x00000020
132#define BTRFSIC_PRINT_MASK_VERBOSE 0x00000040
133#define BTRFSIC_PRINT_MASK_VERY_VERBOSE 0x00000080
134#define BTRFSIC_PRINT_MASK_INITIAL_TREE 0x00000100
135#define BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES 0x00000200
136#define BTRFSIC_PRINT_MASK_INITIAL_DATABASE 0x00000400
137#define BTRFSIC_PRINT_MASK_NUM_COPIES 0x00000800
138#define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS 0x00001000
139#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE 0x00002000
140
141struct btrfsic_dev_state;
142struct btrfsic_state;
143
144struct btrfsic_block {
145 u32 magic_num; /* only used for debug purposes */
146 unsigned int is_metadata:1; /* if it is meta-data, not data-data */
147 unsigned int is_superblock:1; /* if it is one of the superblocks */
148 unsigned int is_iodone:1; /* if is done by lower subsystem */
149 unsigned int iodone_w_error:1; /* error was indicated to endio */
150 unsigned int never_written:1; /* block was added because it was
151 * referenced, not because it was
152 * written */
153 unsigned int mirror_num; /* large enough to hold
154 * BTRFS_SUPER_MIRROR_MAX */
155 struct btrfsic_dev_state *dev_state;
156 u64 dev_bytenr; /* key, physical byte num on disk */
157 u64 logical_bytenr; /* logical byte num on disk */
158 u64 generation;
159 struct btrfs_disk_key disk_key; /* extra info to print in case of
160 * issues, will not always be correct */
161 struct list_head collision_resolving_node; /* list node */
162 struct list_head all_blocks_node; /* list node */
163
164 /* the following two lists contain block_link items */
165 struct list_head ref_to_list; /* list */
166 struct list_head ref_from_list; /* list */
167 struct btrfsic_block *next_in_same_bio;
168 void *orig_bio_bh_private;
169 union {
170 bio_end_io_t *bio;
171 bh_end_io_t *bh;
172 } orig_bio_bh_end_io;
173 int submit_bio_bh_rw;
174 u64 flush_gen; /* only valid if !never_written */
175};
176
177/*
178 * Elements of this type are allocated dynamically and required because
179 * each block object can refer to and can be ref from multiple blocks.
180 * The key to lookup them in the hashtable is the dev_bytenr of
181 * the block ref to plus the one from the block referred from.
182 * The fact that they are searchable via a hashtable and that a
183 * ref_cnt is maintained is not required for the btrfs integrity
184 * check algorithm itself, it is only used to make the output more
185 * beautiful in case that an error is detected (an error is defined
186 * as a write operation to a block while that block is still referenced).
187 */
188struct btrfsic_block_link {
189 u32 magic_num; /* only used for debug purposes */
190 u32 ref_cnt;
191 struct list_head node_ref_to; /* list node */
192 struct list_head node_ref_from; /* list node */
193 struct list_head collision_resolving_node; /* list node */
194 struct btrfsic_block *block_ref_to;
195 struct btrfsic_block *block_ref_from;
196 u64 parent_generation;
197};
198
199struct btrfsic_dev_state {
200 u32 magic_num; /* only used for debug purposes */
201 struct block_device *bdev;
202 struct btrfsic_state *state;
203 struct list_head collision_resolving_node; /* list node */
204 struct btrfsic_block dummy_block_for_bio_bh_flush;
205 u64 last_flush_gen;
206 char name[BDEVNAME_SIZE];
207};
208
209struct btrfsic_block_hashtable {
210 struct list_head table[BTRFSIC_BLOCK_HASHTABLE_SIZE];
211};
212
213struct btrfsic_block_link_hashtable {
214 struct list_head table[BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE];
215};
216
217struct btrfsic_dev_state_hashtable {
218 struct list_head table[BTRFSIC_DEV2STATE_HASHTABLE_SIZE];
219};
220
221struct btrfsic_block_data_ctx {
222 u64 start; /* virtual bytenr */
223 u64 dev_bytenr; /* physical bytenr on device */
224 u32 len;
225 struct btrfsic_dev_state *dev;
226 char **datav;
227 struct page **pagev;
228 void *mem_to_free;
229};
230
231/* This structure is used to implement recursion without occupying
232 * any stack space, refer to btrfsic_process_metablock() */
233struct btrfsic_stack_frame {
234 u32 magic;
235 u32 nr;
236 int error;
237 int i;
238 int limit_nesting;
239 int num_copies;
240 int mirror_num;
241 struct btrfsic_block *block;
242 struct btrfsic_block_data_ctx *block_ctx;
243 struct btrfsic_block *next_block;
244 struct btrfsic_block_data_ctx next_block_ctx;
245 struct btrfs_header *hdr;
246 struct btrfsic_stack_frame *prev;
247};
248
249/* Some state per mounted filesystem */
250struct btrfsic_state {
251 u32 print_mask;
252 int include_extent_data;
253 int csum_size;
254 struct list_head all_blocks_list;
255 struct btrfsic_block_hashtable block_hashtable;
256 struct btrfsic_block_link_hashtable block_link_hashtable;
257 struct btrfs_fs_info *fs_info;
258 u64 max_superblock_generation;
259 struct btrfsic_block *latest_superblock;
260 u32 metablock_size;
261 u32 datablock_size;
262};
263
264static void btrfsic_block_init(struct btrfsic_block *b);
265static struct btrfsic_block *btrfsic_block_alloc(void);
266static void btrfsic_block_free(struct btrfsic_block *b);
267static void btrfsic_block_link_init(struct btrfsic_block_link *n);
268static struct btrfsic_block_link *btrfsic_block_link_alloc(void);
269static void btrfsic_block_link_free(struct btrfsic_block_link *n);
270static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds);
271static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void);
272static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds);
273static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h);
274static void btrfsic_block_hashtable_add(struct btrfsic_block *b,
275 struct btrfsic_block_hashtable *h);
276static void btrfsic_block_hashtable_remove(struct btrfsic_block *b);
277static struct btrfsic_block *btrfsic_block_hashtable_lookup(
278 struct block_device *bdev,
279 u64 dev_bytenr,
280 struct btrfsic_block_hashtable *h);
281static void btrfsic_block_link_hashtable_init(
282 struct btrfsic_block_link_hashtable *h);
283static void btrfsic_block_link_hashtable_add(
284 struct btrfsic_block_link *l,
285 struct btrfsic_block_link_hashtable *h);
286static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l);
287static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup(
288 struct block_device *bdev_ref_to,
289 u64 dev_bytenr_ref_to,
290 struct block_device *bdev_ref_from,
291 u64 dev_bytenr_ref_from,
292 struct btrfsic_block_link_hashtable *h);
293static void btrfsic_dev_state_hashtable_init(
294 struct btrfsic_dev_state_hashtable *h);
295static void btrfsic_dev_state_hashtable_add(
296 struct btrfsic_dev_state *ds,
297 struct btrfsic_dev_state_hashtable *h);
298static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds);
299static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(
300 struct block_device *bdev,
301 struct btrfsic_dev_state_hashtable *h);
302static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void);
303static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf);
304static int btrfsic_process_superblock(struct btrfsic_state *state,
305 struct btrfs_fs_devices *fs_devices);
306static int btrfsic_process_metablock(struct btrfsic_state *state,
307 struct btrfsic_block *block,
308 struct btrfsic_block_data_ctx *block_ctx,
309 int limit_nesting, int force_iodone_flag);
310static void btrfsic_read_from_block_data(
311 struct btrfsic_block_data_ctx *block_ctx,
312 void *dst, u32 offset, size_t len);
313static int btrfsic_create_link_to_next_block(
314 struct btrfsic_state *state,
315 struct btrfsic_block *block,
316 struct btrfsic_block_data_ctx
317 *block_ctx, u64 next_bytenr,
318 int limit_nesting,
319 struct btrfsic_block_data_ctx *next_block_ctx,
320 struct btrfsic_block **next_blockp,
321 int force_iodone_flag,
322 int *num_copiesp, int *mirror_nump,
323 struct btrfs_disk_key *disk_key,
324 u64 parent_generation);
325static int btrfsic_handle_extent_data(struct btrfsic_state *state,
326 struct btrfsic_block *block,
327 struct btrfsic_block_data_ctx *block_ctx,
328 u32 item_offset, int force_iodone_flag);
329static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
330 struct btrfsic_block_data_ctx *block_ctx_out,
331 int mirror_num);
332static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx);
333static int btrfsic_read_block(struct btrfsic_state *state,
334 struct btrfsic_block_data_ctx *block_ctx);
335static void btrfsic_dump_database(struct btrfsic_state *state);
336static int btrfsic_test_for_metadata(struct btrfsic_state *state,
337 char **datav, unsigned int num_pages);
338static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
339 u64 dev_bytenr, char **mapped_datav,
340 unsigned int num_pages,
341 struct bio *bio, int *bio_is_patched,
342 struct buffer_head *bh,
343 int submit_bio_bh_rw);
344static int btrfsic_process_written_superblock(
345 struct btrfsic_state *state,
346 struct btrfsic_block *const block,
347 struct btrfs_super_block *const super_hdr);
348static void btrfsic_bio_end_io(struct bio *bp);
349static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate);
350static int btrfsic_is_block_ref_by_superblock(const struct btrfsic_state *state,
351 const struct btrfsic_block *block,
352 int recursion_level);
353static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state,
354 struct btrfsic_block *const block,
355 int recursion_level);
356static void btrfsic_print_add_link(const struct btrfsic_state *state,
357 const struct btrfsic_block_link *l);
358static void btrfsic_print_rem_link(const struct btrfsic_state *state,
359 const struct btrfsic_block_link *l);
360static char btrfsic_get_block_type(const struct btrfsic_state *state,
361 const struct btrfsic_block *block);
362static void btrfsic_dump_tree(const struct btrfsic_state *state);
363static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
364 const struct btrfsic_block *block,
365 int indent_level);
366static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
367 struct btrfsic_state *state,
368 struct btrfsic_block_data_ctx *next_block_ctx,
369 struct btrfsic_block *next_block,
370 struct btrfsic_block *from_block,
371 u64 parent_generation);
372static struct btrfsic_block *btrfsic_block_lookup_or_add(
373 struct btrfsic_state *state,
374 struct btrfsic_block_data_ctx *block_ctx,
375 const char *additional_string,
376 int is_metadata,
377 int is_iodone,
378 int never_written,
379 int mirror_num,
380 int *was_created);
381static int btrfsic_process_superblock_dev_mirror(
382 struct btrfsic_state *state,
383 struct btrfsic_dev_state *dev_state,
384 struct btrfs_device *device,
385 int superblock_mirror_num,
386 struct btrfsic_dev_state **selected_dev_state,
387 struct btrfs_super_block *selected_super);
388static struct btrfsic_dev_state *btrfsic_dev_state_lookup(
389 struct block_device *bdev);
390static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
391 u64 bytenr,
392 struct btrfsic_dev_state *dev_state,
393 u64 dev_bytenr);
394
395static struct mutex btrfsic_mutex;
396static int btrfsic_is_initialized;
397static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable;
398
399
400static void btrfsic_block_init(struct btrfsic_block *b)
401{
402 b->magic_num = BTRFSIC_BLOCK_MAGIC_NUMBER;
403 b->dev_state = NULL;
404 b->dev_bytenr = 0;
405 b->logical_bytenr = 0;
406 b->generation = BTRFSIC_GENERATION_UNKNOWN;
407 b->disk_key.objectid = 0;
408 b->disk_key.type = 0;
409 b->disk_key.offset = 0;
410 b->is_metadata = 0;
411 b->is_superblock = 0;
412 b->is_iodone = 0;
413 b->iodone_w_error = 0;
414 b->never_written = 0;
415 b->mirror_num = 0;
416 b->next_in_same_bio = NULL;
417 b->orig_bio_bh_private = NULL;
418 b->orig_bio_bh_end_io.bio = NULL;
419 INIT_LIST_HEAD(&b->collision_resolving_node);
420 INIT_LIST_HEAD(&b->all_blocks_node);
421 INIT_LIST_HEAD(&b->ref_to_list);
422 INIT_LIST_HEAD(&b->ref_from_list);
423 b->submit_bio_bh_rw = 0;
424 b->flush_gen = 0;
425}
426
427static struct btrfsic_block *btrfsic_block_alloc(void)
428{
429 struct btrfsic_block *b;
430
431 b = kzalloc(sizeof(*b), GFP_NOFS);
432 if (NULL != b)
433 btrfsic_block_init(b);
434
435 return b;
436}
437
438static void btrfsic_block_free(struct btrfsic_block *b)
439{
440 BUG_ON(!(NULL == b || BTRFSIC_BLOCK_MAGIC_NUMBER == b->magic_num));
441 kfree(b);
442}
443
444static void btrfsic_block_link_init(struct btrfsic_block_link *l)
445{
446 l->magic_num = BTRFSIC_BLOCK_LINK_MAGIC_NUMBER;
447 l->ref_cnt = 1;
448 INIT_LIST_HEAD(&l->node_ref_to);
449 INIT_LIST_HEAD(&l->node_ref_from);
450 INIT_LIST_HEAD(&l->collision_resolving_node);
451 l->block_ref_to = NULL;
452 l->block_ref_from = NULL;
453}
454
455static struct btrfsic_block_link *btrfsic_block_link_alloc(void)
456{
457 struct btrfsic_block_link *l;
458
459 l = kzalloc(sizeof(*l), GFP_NOFS);
460 if (NULL != l)
461 btrfsic_block_link_init(l);
462
463 return l;
464}
465
466static void btrfsic_block_link_free(struct btrfsic_block_link *l)
467{
468 BUG_ON(!(NULL == l || BTRFSIC_BLOCK_LINK_MAGIC_NUMBER == l->magic_num));
469 kfree(l);
470}
471
472static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds)
473{
474 ds->magic_num = BTRFSIC_DEV2STATE_MAGIC_NUMBER;
475 ds->bdev = NULL;
476 ds->state = NULL;
477 ds->name[0] = '\0';
478 INIT_LIST_HEAD(&ds->collision_resolving_node);
479 ds->last_flush_gen = 0;
480 btrfsic_block_init(&ds->dummy_block_for_bio_bh_flush);
481 ds->dummy_block_for_bio_bh_flush.is_iodone = 1;
482 ds->dummy_block_for_bio_bh_flush.dev_state = ds;
483}
484
485static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void)
486{
487 struct btrfsic_dev_state *ds;
488
489 ds = kzalloc(sizeof(*ds), GFP_NOFS);
490 if (NULL != ds)
491 btrfsic_dev_state_init(ds);
492
493 return ds;
494}
495
496static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds)
497{
498 BUG_ON(!(NULL == ds ||
499 BTRFSIC_DEV2STATE_MAGIC_NUMBER == ds->magic_num));
500 kfree(ds);
501}
502
503static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h)
504{
505 int i;
506
507 for (i = 0; i < BTRFSIC_BLOCK_HASHTABLE_SIZE; i++)
508 INIT_LIST_HEAD(h->table + i);
509}
510
511static void btrfsic_block_hashtable_add(struct btrfsic_block *b,
512 struct btrfsic_block_hashtable *h)
513{
514 const unsigned int hashval =
515 (((unsigned int)(b->dev_bytenr >> 16)) ^
516 ((unsigned int)((uintptr_t)b->dev_state->bdev))) &
517 (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
518
519 list_add(&b->collision_resolving_node, h->table + hashval);
520}
521
522static void btrfsic_block_hashtable_remove(struct btrfsic_block *b)
523{
524 list_del(&b->collision_resolving_node);
525}
526
527static struct btrfsic_block *btrfsic_block_hashtable_lookup(
528 struct block_device *bdev,
529 u64 dev_bytenr,
530 struct btrfsic_block_hashtable *h)
531{
532 const unsigned int hashval =
533 (((unsigned int)(dev_bytenr >> 16)) ^
534 ((unsigned int)((uintptr_t)bdev))) &
535 (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
536 struct btrfsic_block *b;
537
538 list_for_each_entry(b, h->table + hashval, collision_resolving_node) {
539 if (b->dev_state->bdev == bdev && b->dev_bytenr == dev_bytenr)
540 return b;
541 }
542
543 return NULL;
544}
545
546static void btrfsic_block_link_hashtable_init(
547 struct btrfsic_block_link_hashtable *h)
548{
549 int i;
550
551 for (i = 0; i < BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE; i++)
552 INIT_LIST_HEAD(h->table + i);
553}
554
555static void btrfsic_block_link_hashtable_add(
556 struct btrfsic_block_link *l,
557 struct btrfsic_block_link_hashtable *h)
558{
559 const unsigned int hashval =
560 (((unsigned int)(l->block_ref_to->dev_bytenr >> 16)) ^
561 ((unsigned int)(l->block_ref_from->dev_bytenr >> 16)) ^
562 ((unsigned int)((uintptr_t)l->block_ref_to->dev_state->bdev)) ^
563 ((unsigned int)((uintptr_t)l->block_ref_from->dev_state->bdev)))
564 & (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
565
566 BUG_ON(NULL == l->block_ref_to);
567 BUG_ON(NULL == l->block_ref_from);
568 list_add(&l->collision_resolving_node, h->table + hashval);
569}
570
571static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l)
572{
573 list_del(&l->collision_resolving_node);
574}
575
576static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup(
577 struct block_device *bdev_ref_to,
578 u64 dev_bytenr_ref_to,
579 struct block_device *bdev_ref_from,
580 u64 dev_bytenr_ref_from,
581 struct btrfsic_block_link_hashtable *h)
582{
583 const unsigned int hashval =
584 (((unsigned int)(dev_bytenr_ref_to >> 16)) ^
585 ((unsigned int)(dev_bytenr_ref_from >> 16)) ^
586 ((unsigned int)((uintptr_t)bdev_ref_to)) ^
587 ((unsigned int)((uintptr_t)bdev_ref_from))) &
588 (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
589 struct btrfsic_block_link *l;
590
591 list_for_each_entry(l, h->table + hashval, collision_resolving_node) {
592 BUG_ON(NULL == l->block_ref_to);
593 BUG_ON(NULL == l->block_ref_from);
594 if (l->block_ref_to->dev_state->bdev == bdev_ref_to &&
595 l->block_ref_to->dev_bytenr == dev_bytenr_ref_to &&
596 l->block_ref_from->dev_state->bdev == bdev_ref_from &&
597 l->block_ref_from->dev_bytenr == dev_bytenr_ref_from)
598 return l;
599 }
600
601 return NULL;
602}
603
604static void btrfsic_dev_state_hashtable_init(
605 struct btrfsic_dev_state_hashtable *h)
606{
607 int i;
608
609 for (i = 0; i < BTRFSIC_DEV2STATE_HASHTABLE_SIZE; i++)
610 INIT_LIST_HEAD(h->table + i);
611}
612
613static void btrfsic_dev_state_hashtable_add(
614 struct btrfsic_dev_state *ds,
615 struct btrfsic_dev_state_hashtable *h)
616{
617 const unsigned int hashval =
618 (((unsigned int)((uintptr_t)ds->bdev)) &
619 (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1));
620
621 list_add(&ds->collision_resolving_node, h->table + hashval);
622}
623
624static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds)
625{
626 list_del(&ds->collision_resolving_node);
627}
628
629static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(
630 struct block_device *bdev,
631 struct btrfsic_dev_state_hashtable *h)
632{
633 const unsigned int hashval =
634 (((unsigned int)((uintptr_t)bdev)) &
635 (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1));
636 struct btrfsic_dev_state *ds;
637
638 list_for_each_entry(ds, h->table + hashval, collision_resolving_node) {
639 if (ds->bdev == bdev)
640 return ds;
641 }
642
643 return NULL;
644}
645
646static int btrfsic_process_superblock(struct btrfsic_state *state,
647 struct btrfs_fs_devices *fs_devices)
648{
649 struct btrfs_fs_info *fs_info = state->fs_info;
650 struct btrfs_super_block *selected_super;
651 struct list_head *dev_head = &fs_devices->devices;
652 struct btrfs_device *device;
653 struct btrfsic_dev_state *selected_dev_state = NULL;
654 int ret = 0;
655 int pass;
656
657 BUG_ON(NULL == state);
658 selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS);
659 if (NULL == selected_super) {
660 pr_info("btrfsic: error, kmalloc failed!\n");
661 return -ENOMEM;
662 }
663
664 list_for_each_entry(device, dev_head, dev_list) {
665 int i;
666 struct btrfsic_dev_state *dev_state;
667
668 if (!device->bdev || !device->name)
669 continue;
670
671 dev_state = btrfsic_dev_state_lookup(device->bdev);
672 BUG_ON(NULL == dev_state);
673 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
674 ret = btrfsic_process_superblock_dev_mirror(
675 state, dev_state, device, i,
676 &selected_dev_state, selected_super);
677 if (0 != ret && 0 == i) {
678 kfree(selected_super);
679 return ret;
680 }
681 }
682 }
683
684 if (NULL == state->latest_superblock) {
685 pr_info("btrfsic: no superblock found!\n");
686 kfree(selected_super);
687 return -1;
688 }
689
690 state->csum_size = btrfs_super_csum_size(selected_super);
691
692 for (pass = 0; pass < 3; pass++) {
693 int num_copies;
694 int mirror_num;
695 u64 next_bytenr;
696
697 switch (pass) {
698 case 0:
699 next_bytenr = btrfs_super_root(selected_super);
700 if (state->print_mask &
701 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
702 pr_info("root@%llu\n", next_bytenr);
703 break;
704 case 1:
705 next_bytenr = btrfs_super_chunk_root(selected_super);
706 if (state->print_mask &
707 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
708 pr_info("chunk@%llu\n", next_bytenr);
709 break;
710 case 2:
711 next_bytenr = btrfs_super_log_root(selected_super);
712 if (0 == next_bytenr)
713 continue;
714 if (state->print_mask &
715 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
716 pr_info("log@%llu\n", next_bytenr);
717 break;
718 }
719
720 num_copies = btrfs_num_copies(fs_info, next_bytenr,
721 state->metablock_size);
722 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
723 pr_info("num_copies(log_bytenr=%llu) = %d\n",
724 next_bytenr, num_copies);
725
726 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
727 struct btrfsic_block *next_block;
728 struct btrfsic_block_data_ctx tmp_next_block_ctx;
729 struct btrfsic_block_link *l;
730
731 ret = btrfsic_map_block(state, next_bytenr,
732 state->metablock_size,
733 &tmp_next_block_ctx,
734 mirror_num);
735 if (ret) {
736 pr_info("btrfsic: btrfsic_map_block(root @%llu, mirror %d) failed!\n",
737 next_bytenr, mirror_num);
738 kfree(selected_super);
739 return -1;
740 }
741
742 next_block = btrfsic_block_hashtable_lookup(
743 tmp_next_block_ctx.dev->bdev,
744 tmp_next_block_ctx.dev_bytenr,
745 &state->block_hashtable);
746 BUG_ON(NULL == next_block);
747
748 l = btrfsic_block_link_hashtable_lookup(
749 tmp_next_block_ctx.dev->bdev,
750 tmp_next_block_ctx.dev_bytenr,
751 state->latest_superblock->dev_state->
752 bdev,
753 state->latest_superblock->dev_bytenr,
754 &state->block_link_hashtable);
755 BUG_ON(NULL == l);
756
757 ret = btrfsic_read_block(state, &tmp_next_block_ctx);
758 if (ret < (int)PAGE_SIZE) {
759 pr_info("btrfsic: read @logical %llu failed!\n",
760 tmp_next_block_ctx.start);
761 btrfsic_release_block_ctx(&tmp_next_block_ctx);
762 kfree(selected_super);
763 return -1;
764 }
765
766 ret = btrfsic_process_metablock(state,
767 next_block,
768 &tmp_next_block_ctx,
769 BTRFS_MAX_LEVEL + 3, 1);
770 btrfsic_release_block_ctx(&tmp_next_block_ctx);
771 }
772 }
773
774 kfree(selected_super);
775 return ret;
776}
777
778static int btrfsic_process_superblock_dev_mirror(
779 struct btrfsic_state *state,
780 struct btrfsic_dev_state *dev_state,
781 struct btrfs_device *device,
782 int superblock_mirror_num,
783 struct btrfsic_dev_state **selected_dev_state,
784 struct btrfs_super_block *selected_super)
785{
786 struct btrfs_fs_info *fs_info = state->fs_info;
787 struct btrfs_super_block *super_tmp;
788 u64 dev_bytenr;
789 struct buffer_head *bh;
790 struct btrfsic_block *superblock_tmp;
791 int pass;
792 struct block_device *const superblock_bdev = device->bdev;
793
794 /* super block bytenr is always the unmapped device bytenr */
795 dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
796 if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->commit_total_bytes)
797 return -1;
798 bh = __bread(superblock_bdev, dev_bytenr / 4096,
799 BTRFS_SUPER_INFO_SIZE);
800 if (NULL == bh)
801 return -1;
802 super_tmp = (struct btrfs_super_block *)
803 (bh->b_data + (dev_bytenr & 4095));
804
805 if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
806 btrfs_super_magic(super_tmp) != BTRFS_MAGIC ||
807 memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) ||
808 btrfs_super_nodesize(super_tmp) != state->metablock_size ||
809 btrfs_super_sectorsize(super_tmp) != state->datablock_size) {
810 brelse(bh);
811 return 0;
812 }
813
814 superblock_tmp =
815 btrfsic_block_hashtable_lookup(superblock_bdev,
816 dev_bytenr,
817 &state->block_hashtable);
818 if (NULL == superblock_tmp) {
819 superblock_tmp = btrfsic_block_alloc();
820 if (NULL == superblock_tmp) {
821 pr_info("btrfsic: error, kmalloc failed!\n");
822 brelse(bh);
823 return -1;
824 }
825 /* for superblock, only the dev_bytenr makes sense */
826 superblock_tmp->dev_bytenr = dev_bytenr;
827 superblock_tmp->dev_state = dev_state;
828 superblock_tmp->logical_bytenr = dev_bytenr;
829 superblock_tmp->generation = btrfs_super_generation(super_tmp);
830 superblock_tmp->is_metadata = 1;
831 superblock_tmp->is_superblock = 1;
832 superblock_tmp->is_iodone = 1;
833 superblock_tmp->never_written = 0;
834 superblock_tmp->mirror_num = 1 + superblock_mirror_num;
835 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
836 btrfs_info_in_rcu(fs_info,
837 "new initial S-block (bdev %p, %s) @%llu (%s/%llu/%d)",
838 superblock_bdev,
839 rcu_str_deref(device->name), dev_bytenr,
840 dev_state->name, dev_bytenr,
841 superblock_mirror_num);
842 list_add(&superblock_tmp->all_blocks_node,
843 &state->all_blocks_list);
844 btrfsic_block_hashtable_add(superblock_tmp,
845 &state->block_hashtable);
846 }
847
848 /* select the one with the highest generation field */
849 if (btrfs_super_generation(super_tmp) >
850 state->max_superblock_generation ||
851 0 == state->max_superblock_generation) {
852 memcpy(selected_super, super_tmp, sizeof(*selected_super));
853 *selected_dev_state = dev_state;
854 state->max_superblock_generation =
855 btrfs_super_generation(super_tmp);
856 state->latest_superblock = superblock_tmp;
857 }
858
859 for (pass = 0; pass < 3; pass++) {
860 u64 next_bytenr;
861 int num_copies;
862 int mirror_num;
863 const char *additional_string = NULL;
864 struct btrfs_disk_key tmp_disk_key;
865
866 tmp_disk_key.type = BTRFS_ROOT_ITEM_KEY;
867 tmp_disk_key.offset = 0;
868 switch (pass) {
869 case 0:
870 btrfs_set_disk_key_objectid(&tmp_disk_key,
871 BTRFS_ROOT_TREE_OBJECTID);
872 additional_string = "initial root ";
873 next_bytenr = btrfs_super_root(super_tmp);
874 break;
875 case 1:
876 btrfs_set_disk_key_objectid(&tmp_disk_key,
877 BTRFS_CHUNK_TREE_OBJECTID);
878 additional_string = "initial chunk ";
879 next_bytenr = btrfs_super_chunk_root(super_tmp);
880 break;
881 case 2:
882 btrfs_set_disk_key_objectid(&tmp_disk_key,
883 BTRFS_TREE_LOG_OBJECTID);
884 additional_string = "initial log ";
885 next_bytenr = btrfs_super_log_root(super_tmp);
886 if (0 == next_bytenr)
887 continue;
888 break;
889 }
890
891 num_copies = btrfs_num_copies(fs_info, next_bytenr,
892 state->metablock_size);
893 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
894 pr_info("num_copies(log_bytenr=%llu) = %d\n",
895 next_bytenr, num_copies);
896 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
897 struct btrfsic_block *next_block;
898 struct btrfsic_block_data_ctx tmp_next_block_ctx;
899 struct btrfsic_block_link *l;
900
901 if (btrfsic_map_block(state, next_bytenr,
902 state->metablock_size,
903 &tmp_next_block_ctx,
904 mirror_num)) {
905 pr_info("btrfsic: btrfsic_map_block(bytenr @%llu, mirror %d) failed!\n",
906 next_bytenr, mirror_num);
907 brelse(bh);
908 return -1;
909 }
910
911 next_block = btrfsic_block_lookup_or_add(
912 state, &tmp_next_block_ctx,
913 additional_string, 1, 1, 0,
914 mirror_num, NULL);
915 if (NULL == next_block) {
916 btrfsic_release_block_ctx(&tmp_next_block_ctx);
917 brelse(bh);
918 return -1;
919 }
920
921 next_block->disk_key = tmp_disk_key;
922 next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
923 l = btrfsic_block_link_lookup_or_add(
924 state, &tmp_next_block_ctx,
925 next_block, superblock_tmp,
926 BTRFSIC_GENERATION_UNKNOWN);
927 btrfsic_release_block_ctx(&tmp_next_block_ctx);
928 if (NULL == l) {
929 brelse(bh);
930 return -1;
931 }
932 }
933 }
934 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES)
935 btrfsic_dump_tree_sub(state, superblock_tmp, 0);
936
937 brelse(bh);
938 return 0;
939}
940
941static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void)
942{
943 struct btrfsic_stack_frame *sf;
944
945 sf = kzalloc(sizeof(*sf), GFP_NOFS);
946 if (NULL == sf)
947 pr_info("btrfsic: alloc memory failed!\n");
948 else
949 sf->magic = BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER;
950 return sf;
951}
952
953static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf)
954{
955 BUG_ON(!(NULL == sf ||
956 BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER == sf->magic));
957 kfree(sf);
958}
959
960static int btrfsic_process_metablock(
961 struct btrfsic_state *state,
962 struct btrfsic_block *const first_block,
963 struct btrfsic_block_data_ctx *const first_block_ctx,
964 int first_limit_nesting, int force_iodone_flag)
965{
966 struct btrfsic_stack_frame initial_stack_frame = { 0 };
967 struct btrfsic_stack_frame *sf;
968 struct btrfsic_stack_frame *next_stack;
969 struct btrfs_header *const first_hdr =
970 (struct btrfs_header *)first_block_ctx->datav[0];
971
972 BUG_ON(!first_hdr);
973 sf = &initial_stack_frame;
974 sf->error = 0;
975 sf->i = -1;
976 sf->limit_nesting = first_limit_nesting;
977 sf->block = first_block;
978 sf->block_ctx = first_block_ctx;
979 sf->next_block = NULL;
980 sf->hdr = first_hdr;
981 sf->prev = NULL;
982
983continue_with_new_stack_frame:
984 sf->block->generation = le64_to_cpu(sf->hdr->generation);
985 if (0 == sf->hdr->level) {
986 struct btrfs_leaf *const leafhdr =
987 (struct btrfs_leaf *)sf->hdr;
988
989 if (-1 == sf->i) {
990 sf->nr = btrfs_stack_header_nritems(&leafhdr->header);
991
992 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
993 pr_info("leaf %llu items %d generation %llu owner %llu\n",
994 sf->block_ctx->start, sf->nr,
995 btrfs_stack_header_generation(
996 &leafhdr->header),
997 btrfs_stack_header_owner(
998 &leafhdr->header));
999 }
1000
1001continue_with_current_leaf_stack_frame:
1002 if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
1003 sf->i++;
1004 sf->num_copies = 0;
1005 }
1006
1007 if (sf->i < sf->nr) {
1008 struct btrfs_item disk_item;
1009 u32 disk_item_offset =
1010 (uintptr_t)(leafhdr->items + sf->i) -
1011 (uintptr_t)leafhdr;
1012 struct btrfs_disk_key *disk_key;
1013 u8 type;
1014 u32 item_offset;
1015 u32 item_size;
1016
1017 if (disk_item_offset + sizeof(struct btrfs_item) >
1018 sf->block_ctx->len) {
1019leaf_item_out_of_bounce_error:
1020 pr_info("btrfsic: leaf item out of bounce at logical %llu, dev %s\n",
1021 sf->block_ctx->start,
1022 sf->block_ctx->dev->name);
1023 goto one_stack_frame_backwards;
1024 }
1025 btrfsic_read_from_block_data(sf->block_ctx,
1026 &disk_item,
1027 disk_item_offset,
1028 sizeof(struct btrfs_item));
1029 item_offset = btrfs_stack_item_offset(&disk_item);
1030 item_size = btrfs_stack_item_size(&disk_item);
1031 disk_key = &disk_item.key;
1032 type = btrfs_disk_key_type(disk_key);
1033
1034 if (BTRFS_ROOT_ITEM_KEY == type) {
1035 struct btrfs_root_item root_item;
1036 u32 root_item_offset;
1037 u64 next_bytenr;
1038
1039 root_item_offset = item_offset +
1040 offsetof(struct btrfs_leaf, items);
1041 if (root_item_offset + item_size >
1042 sf->block_ctx->len)
1043 goto leaf_item_out_of_bounce_error;
1044 btrfsic_read_from_block_data(
1045 sf->block_ctx, &root_item,
1046 root_item_offset,
1047 item_size);
1048 next_bytenr = btrfs_root_bytenr(&root_item);
1049
1050 sf->error =
1051 btrfsic_create_link_to_next_block(
1052 state,
1053 sf->block,
1054 sf->block_ctx,
1055 next_bytenr,
1056 sf->limit_nesting,
1057 &sf->next_block_ctx,
1058 &sf->next_block,
1059 force_iodone_flag,
1060 &sf->num_copies,
1061 &sf->mirror_num,
1062 disk_key,
1063 btrfs_root_generation(
1064 &root_item));
1065 if (sf->error)
1066 goto one_stack_frame_backwards;
1067
1068 if (NULL != sf->next_block) {
1069 struct btrfs_header *const next_hdr =
1070 (struct btrfs_header *)
1071 sf->next_block_ctx.datav[0];
1072
1073 next_stack =
1074 btrfsic_stack_frame_alloc();
1075 if (NULL == next_stack) {
1076 sf->error = -1;
1077 btrfsic_release_block_ctx(
1078 &sf->
1079 next_block_ctx);
1080 goto one_stack_frame_backwards;
1081 }
1082
1083 next_stack->i = -1;
1084 next_stack->block = sf->next_block;
1085 next_stack->block_ctx =
1086 &sf->next_block_ctx;
1087 next_stack->next_block = NULL;
1088 next_stack->hdr = next_hdr;
1089 next_stack->limit_nesting =
1090 sf->limit_nesting - 1;
1091 next_stack->prev = sf;
1092 sf = next_stack;
1093 goto continue_with_new_stack_frame;
1094 }
1095 } else if (BTRFS_EXTENT_DATA_KEY == type &&
1096 state->include_extent_data) {
1097 sf->error = btrfsic_handle_extent_data(
1098 state,
1099 sf->block,
1100 sf->block_ctx,
1101 item_offset,
1102 force_iodone_flag);
1103 if (sf->error)
1104 goto one_stack_frame_backwards;
1105 }
1106
1107 goto continue_with_current_leaf_stack_frame;
1108 }
1109 } else {
1110 struct btrfs_node *const nodehdr = (struct btrfs_node *)sf->hdr;
1111
1112 if (-1 == sf->i) {
1113 sf->nr = btrfs_stack_header_nritems(&nodehdr->header);
1114
1115 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1116 pr_info("node %llu level %d items %d generation %llu owner %llu\n",
1117 sf->block_ctx->start,
1118 nodehdr->header.level, sf->nr,
1119 btrfs_stack_header_generation(
1120 &nodehdr->header),
1121 btrfs_stack_header_owner(
1122 &nodehdr->header));
1123 }
1124
1125continue_with_current_node_stack_frame:
1126 if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
1127 sf->i++;
1128 sf->num_copies = 0;
1129 }
1130
1131 if (sf->i < sf->nr) {
1132 struct btrfs_key_ptr key_ptr;
1133 u32 key_ptr_offset;
1134 u64 next_bytenr;
1135
1136 key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) -
1137 (uintptr_t)nodehdr;
1138 if (key_ptr_offset + sizeof(struct btrfs_key_ptr) >
1139 sf->block_ctx->len) {
1140 pr_info("btrfsic: node item out of bounce at logical %llu, dev %s\n",
1141 sf->block_ctx->start,
1142 sf->block_ctx->dev->name);
1143 goto one_stack_frame_backwards;
1144 }
1145 btrfsic_read_from_block_data(
1146 sf->block_ctx, &key_ptr, key_ptr_offset,
1147 sizeof(struct btrfs_key_ptr));
1148 next_bytenr = btrfs_stack_key_blockptr(&key_ptr);
1149
1150 sf->error = btrfsic_create_link_to_next_block(
1151 state,
1152 sf->block,
1153 sf->block_ctx,
1154 next_bytenr,
1155 sf->limit_nesting,
1156 &sf->next_block_ctx,
1157 &sf->next_block,
1158 force_iodone_flag,
1159 &sf->num_copies,
1160 &sf->mirror_num,
1161 &key_ptr.key,
1162 btrfs_stack_key_generation(&key_ptr));
1163 if (sf->error)
1164 goto one_stack_frame_backwards;
1165
1166 if (NULL != sf->next_block) {
1167 struct btrfs_header *const next_hdr =
1168 (struct btrfs_header *)
1169 sf->next_block_ctx.datav[0];
1170
1171 next_stack = btrfsic_stack_frame_alloc();
1172 if (NULL == next_stack) {
1173 sf->error = -1;
1174 goto one_stack_frame_backwards;
1175 }
1176
1177 next_stack->i = -1;
1178 next_stack->block = sf->next_block;
1179 next_stack->block_ctx = &sf->next_block_ctx;
1180 next_stack->next_block = NULL;
1181 next_stack->hdr = next_hdr;
1182 next_stack->limit_nesting =
1183 sf->limit_nesting - 1;
1184 next_stack->prev = sf;
1185 sf = next_stack;
1186 goto continue_with_new_stack_frame;
1187 }
1188
1189 goto continue_with_current_node_stack_frame;
1190 }
1191 }
1192
1193one_stack_frame_backwards:
1194 if (NULL != sf->prev) {
1195 struct btrfsic_stack_frame *const prev = sf->prev;
1196
1197 /* the one for the initial block is freed in the caller */
1198 btrfsic_release_block_ctx(sf->block_ctx);
1199
1200 if (sf->error) {
1201 prev->error = sf->error;
1202 btrfsic_stack_frame_free(sf);
1203 sf = prev;
1204 goto one_stack_frame_backwards;
1205 }
1206
1207 btrfsic_stack_frame_free(sf);
1208 sf = prev;
1209 goto continue_with_new_stack_frame;
1210 } else {
1211 BUG_ON(&initial_stack_frame != sf);
1212 }
1213
1214 return sf->error;
1215}
1216
1217static void btrfsic_read_from_block_data(
1218 struct btrfsic_block_data_ctx *block_ctx,
1219 void *dstv, u32 offset, size_t len)
1220{
1221 size_t cur;
1222 size_t offset_in_page;
1223 char *kaddr;
1224 char *dst = (char *)dstv;
1225 size_t start_offset = block_ctx->start & ((u64)PAGE_SIZE - 1);
1226 unsigned long i = (start_offset + offset) >> PAGE_SHIFT;
1227
1228 WARN_ON(offset + len > block_ctx->len);
1229 offset_in_page = (start_offset + offset) & (PAGE_SIZE - 1);
1230
1231 while (len > 0) {
1232 cur = min(len, ((size_t)PAGE_SIZE - offset_in_page));
1233 BUG_ON(i >= DIV_ROUND_UP(block_ctx->len, PAGE_SIZE));
1234 kaddr = block_ctx->datav[i];
1235 memcpy(dst, kaddr + offset_in_page, cur);
1236
1237 dst += cur;
1238 len -= cur;
1239 offset_in_page = 0;
1240 i++;
1241 }
1242}
1243
1244static int btrfsic_create_link_to_next_block(
1245 struct btrfsic_state *state,
1246 struct btrfsic_block *block,
1247 struct btrfsic_block_data_ctx *block_ctx,
1248 u64 next_bytenr,
1249 int limit_nesting,
1250 struct btrfsic_block_data_ctx *next_block_ctx,
1251 struct btrfsic_block **next_blockp,
1252 int force_iodone_flag,
1253 int *num_copiesp, int *mirror_nump,
1254 struct btrfs_disk_key *disk_key,
1255 u64 parent_generation)
1256{
1257 struct btrfs_fs_info *fs_info = state->fs_info;
1258 struct btrfsic_block *next_block = NULL;
1259 int ret;
1260 struct btrfsic_block_link *l;
1261 int did_alloc_block_link;
1262 int block_was_created;
1263
1264 *next_blockp = NULL;
1265 if (0 == *num_copiesp) {
1266 *num_copiesp = btrfs_num_copies(fs_info, next_bytenr,
1267 state->metablock_size);
1268 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
1269 pr_info("num_copies(log_bytenr=%llu) = %d\n",
1270 next_bytenr, *num_copiesp);
1271 *mirror_nump = 1;
1272 }
1273
1274 if (*mirror_nump > *num_copiesp)
1275 return 0;
1276
1277 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1278 pr_info("btrfsic_create_link_to_next_block(mirror_num=%d)\n",
1279 *mirror_nump);
1280 ret = btrfsic_map_block(state, next_bytenr,
1281 state->metablock_size,
1282 next_block_ctx, *mirror_nump);
1283 if (ret) {
1284 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
1285 next_bytenr, *mirror_nump);
1286 btrfsic_release_block_ctx(next_block_ctx);
1287 *next_blockp = NULL;
1288 return -1;
1289 }
1290
1291 next_block = btrfsic_block_lookup_or_add(state,
1292 next_block_ctx, "referenced ",
1293 1, force_iodone_flag,
1294 !force_iodone_flag,
1295 *mirror_nump,
1296 &block_was_created);
1297 if (NULL == next_block) {
1298 btrfsic_release_block_ctx(next_block_ctx);
1299 *next_blockp = NULL;
1300 return -1;
1301 }
1302 if (block_was_created) {
1303 l = NULL;
1304 next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
1305 } else {
1306 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) {
1307 if (next_block->logical_bytenr != next_bytenr &&
1308 !(!next_block->is_metadata &&
1309 0 == next_block->logical_bytenr))
1310 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, %c, bytenr mismatch (!= stored %llu).\n",
1311 next_bytenr, next_block_ctx->dev->name,
1312 next_block_ctx->dev_bytenr, *mirror_nump,
1313 btrfsic_get_block_type(state,
1314 next_block),
1315 next_block->logical_bytenr);
1316 else
1317 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1318 next_bytenr, next_block_ctx->dev->name,
1319 next_block_ctx->dev_bytenr, *mirror_nump,
1320 btrfsic_get_block_type(state,
1321 next_block));
1322 }
1323 next_block->logical_bytenr = next_bytenr;
1324
1325 next_block->mirror_num = *mirror_nump;
1326 l = btrfsic_block_link_hashtable_lookup(
1327 next_block_ctx->dev->bdev,
1328 next_block_ctx->dev_bytenr,
1329 block_ctx->dev->bdev,
1330 block_ctx->dev_bytenr,
1331 &state->block_link_hashtable);
1332 }
1333
1334 next_block->disk_key = *disk_key;
1335 if (NULL == l) {
1336 l = btrfsic_block_link_alloc();
1337 if (NULL == l) {
1338 pr_info("btrfsic: error, kmalloc failed!\n");
1339 btrfsic_release_block_ctx(next_block_ctx);
1340 *next_blockp = NULL;
1341 return -1;
1342 }
1343
1344 did_alloc_block_link = 1;
1345 l->block_ref_to = next_block;
1346 l->block_ref_from = block;
1347 l->ref_cnt = 1;
1348 l->parent_generation = parent_generation;
1349
1350 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1351 btrfsic_print_add_link(state, l);
1352
1353 list_add(&l->node_ref_to, &block->ref_to_list);
1354 list_add(&l->node_ref_from, &next_block->ref_from_list);
1355
1356 btrfsic_block_link_hashtable_add(l,
1357 &state->block_link_hashtable);
1358 } else {
1359 did_alloc_block_link = 0;
1360 if (0 == limit_nesting) {
1361 l->ref_cnt++;
1362 l->parent_generation = parent_generation;
1363 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1364 btrfsic_print_add_link(state, l);
1365 }
1366 }
1367
1368 if (limit_nesting > 0 && did_alloc_block_link) {
1369 ret = btrfsic_read_block(state, next_block_ctx);
1370 if (ret < (int)next_block_ctx->len) {
1371 pr_info("btrfsic: read block @logical %llu failed!\n",
1372 next_bytenr);
1373 btrfsic_release_block_ctx(next_block_ctx);
1374 *next_blockp = NULL;
1375 return -1;
1376 }
1377
1378 *next_blockp = next_block;
1379 } else {
1380 *next_blockp = NULL;
1381 }
1382 (*mirror_nump)++;
1383
1384 return 0;
1385}
1386
1387static int btrfsic_handle_extent_data(
1388 struct btrfsic_state *state,
1389 struct btrfsic_block *block,
1390 struct btrfsic_block_data_ctx *block_ctx,
1391 u32 item_offset, int force_iodone_flag)
1392{
1393 struct btrfs_fs_info *fs_info = state->fs_info;
1394 struct btrfs_file_extent_item file_extent_item;
1395 u64 file_extent_item_offset;
1396 u64 next_bytenr;
1397 u64 num_bytes;
1398 u64 generation;
1399 struct btrfsic_block_link *l;
1400 int ret;
1401
1402 file_extent_item_offset = offsetof(struct btrfs_leaf, items) +
1403 item_offset;
1404 if (file_extent_item_offset +
1405 offsetof(struct btrfs_file_extent_item, disk_num_bytes) >
1406 block_ctx->len) {
1407 pr_info("btrfsic: file item out of bounce at logical %llu, dev %s\n",
1408 block_ctx->start, block_ctx->dev->name);
1409 return -1;
1410 }
1411
1412 btrfsic_read_from_block_data(block_ctx, &file_extent_item,
1413 file_extent_item_offset,
1414 offsetof(struct btrfs_file_extent_item, disk_num_bytes));
1415 if (BTRFS_FILE_EXTENT_REG != file_extent_item.type ||
1416 btrfs_stack_file_extent_disk_bytenr(&file_extent_item) == 0) {
1417 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1418 pr_info("extent_data: type %u, disk_bytenr = %llu\n",
1419 file_extent_item.type,
1420 btrfs_stack_file_extent_disk_bytenr(
1421 &file_extent_item));
1422 return 0;
1423 }
1424
1425 if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) >
1426 block_ctx->len) {
1427 pr_info("btrfsic: file item out of bounce at logical %llu, dev %s\n",
1428 block_ctx->start, block_ctx->dev->name);
1429 return -1;
1430 }
1431 btrfsic_read_from_block_data(block_ctx, &file_extent_item,
1432 file_extent_item_offset,
1433 sizeof(struct btrfs_file_extent_item));
1434 next_bytenr = btrfs_stack_file_extent_disk_bytenr(&file_extent_item);
1435 if (btrfs_stack_file_extent_compression(&file_extent_item) ==
1436 BTRFS_COMPRESS_NONE) {
1437 next_bytenr += btrfs_stack_file_extent_offset(&file_extent_item);
1438 num_bytes = btrfs_stack_file_extent_num_bytes(&file_extent_item);
1439 } else {
1440 num_bytes = btrfs_stack_file_extent_disk_num_bytes(&file_extent_item);
1441 }
1442 generation = btrfs_stack_file_extent_generation(&file_extent_item);
1443
1444 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1445 pr_info("extent_data: type %u, disk_bytenr = %llu, offset = %llu, num_bytes = %llu\n",
1446 file_extent_item.type,
1447 btrfs_stack_file_extent_disk_bytenr(&file_extent_item),
1448 btrfs_stack_file_extent_offset(&file_extent_item),
1449 num_bytes);
1450 while (num_bytes > 0) {
1451 u32 chunk_len;
1452 int num_copies;
1453 int mirror_num;
1454
1455 if (num_bytes > state->datablock_size)
1456 chunk_len = state->datablock_size;
1457 else
1458 chunk_len = num_bytes;
1459
1460 num_copies = btrfs_num_copies(fs_info, next_bytenr,
1461 state->datablock_size);
1462 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
1463 pr_info("num_copies(log_bytenr=%llu) = %d\n",
1464 next_bytenr, num_copies);
1465 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
1466 struct btrfsic_block_data_ctx next_block_ctx;
1467 struct btrfsic_block *next_block;
1468 int block_was_created;
1469
1470 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1471 pr_info("btrfsic_handle_extent_data(mirror_num=%d)\n",
1472 mirror_num);
1473 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1474 pr_info("\tdisk_bytenr = %llu, num_bytes %u\n",
1475 next_bytenr, chunk_len);
1476 ret = btrfsic_map_block(state, next_bytenr,
1477 chunk_len, &next_block_ctx,
1478 mirror_num);
1479 if (ret) {
1480 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
1481 next_bytenr, mirror_num);
1482 return -1;
1483 }
1484
1485 next_block = btrfsic_block_lookup_or_add(
1486 state,
1487 &next_block_ctx,
1488 "referenced ",
1489 0,
1490 force_iodone_flag,
1491 !force_iodone_flag,
1492 mirror_num,
1493 &block_was_created);
1494 if (NULL == next_block) {
1495 pr_info("btrfsic: error, kmalloc failed!\n");
1496 btrfsic_release_block_ctx(&next_block_ctx);
1497 return -1;
1498 }
1499 if (!block_was_created) {
1500 if ((state->print_mask &
1501 BTRFSIC_PRINT_MASK_VERBOSE) &&
1502 next_block->logical_bytenr != next_bytenr &&
1503 !(!next_block->is_metadata &&
1504 0 == next_block->logical_bytenr)) {
1505 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, D, bytenr mismatch (!= stored %llu).\n",
1506 next_bytenr,
1507 next_block_ctx.dev->name,
1508 next_block_ctx.dev_bytenr,
1509 mirror_num,
1510 next_block->logical_bytenr);
1511 }
1512 next_block->logical_bytenr = next_bytenr;
1513 next_block->mirror_num = mirror_num;
1514 }
1515
1516 l = btrfsic_block_link_lookup_or_add(state,
1517 &next_block_ctx,
1518 next_block, block,
1519 generation);
1520 btrfsic_release_block_ctx(&next_block_ctx);
1521 if (NULL == l)
1522 return -1;
1523 }
1524
1525 next_bytenr += chunk_len;
1526 num_bytes -= chunk_len;
1527 }
1528
1529 return 0;
1530}
1531
1532static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
1533 struct btrfsic_block_data_ctx *block_ctx_out,
1534 int mirror_num)
1535{
1536 struct btrfs_fs_info *fs_info = state->fs_info;
1537 int ret;
1538 u64 length;
1539 struct btrfs_bio *multi = NULL;
1540 struct btrfs_device *device;
1541
1542 length = len;
1543 ret = btrfs_map_block(fs_info, BTRFS_MAP_READ,
1544 bytenr, &length, &multi, mirror_num);
1545
1546 if (ret) {
1547 block_ctx_out->start = 0;
1548 block_ctx_out->dev_bytenr = 0;
1549 block_ctx_out->len = 0;
1550 block_ctx_out->dev = NULL;
1551 block_ctx_out->datav = NULL;
1552 block_ctx_out->pagev = NULL;
1553 block_ctx_out->mem_to_free = NULL;
1554
1555 return ret;
1556 }
1557
1558 device = multi->stripes[0].dev;
1559 block_ctx_out->dev = btrfsic_dev_state_lookup(device->bdev);
1560 block_ctx_out->dev_bytenr = multi->stripes[0].physical;
1561 block_ctx_out->start = bytenr;
1562 block_ctx_out->len = len;
1563 block_ctx_out->datav = NULL;
1564 block_ctx_out->pagev = NULL;
1565 block_ctx_out->mem_to_free = NULL;
1566
1567 kfree(multi);
1568 if (NULL == block_ctx_out->dev) {
1569 ret = -ENXIO;
1570 pr_info("btrfsic: error, cannot lookup dev (#1)!\n");
1571 }
1572
1573 return ret;
1574}
1575
1576static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx)
1577{
1578 if (block_ctx->mem_to_free) {
1579 unsigned int num_pages;
1580
1581 BUG_ON(!block_ctx->datav);
1582 BUG_ON(!block_ctx->pagev);
1583 num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
1584 PAGE_SHIFT;
1585 while (num_pages > 0) {
1586 num_pages--;
1587 if (block_ctx->datav[num_pages]) {
1588 kunmap(block_ctx->pagev[num_pages]);
1589 block_ctx->datav[num_pages] = NULL;
1590 }
1591 if (block_ctx->pagev[num_pages]) {
1592 __free_page(block_ctx->pagev[num_pages]);
1593 block_ctx->pagev[num_pages] = NULL;
1594 }
1595 }
1596
1597 kfree(block_ctx->mem_to_free);
1598 block_ctx->mem_to_free = NULL;
1599 block_ctx->pagev = NULL;
1600 block_ctx->datav = NULL;
1601 }
1602}
1603
1604static int btrfsic_read_block(struct btrfsic_state *state,
1605 struct btrfsic_block_data_ctx *block_ctx)
1606{
1607 unsigned int num_pages;
1608 unsigned int i;
1609 u64 dev_bytenr;
1610 int ret;
1611
1612 BUG_ON(block_ctx->datav);
1613 BUG_ON(block_ctx->pagev);
1614 BUG_ON(block_ctx->mem_to_free);
1615 if (block_ctx->dev_bytenr & ((u64)PAGE_SIZE - 1)) {
1616 pr_info("btrfsic: read_block() with unaligned bytenr %llu\n",
1617 block_ctx->dev_bytenr);
1618 return -1;
1619 }
1620
1621 num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
1622 PAGE_SHIFT;
1623 block_ctx->mem_to_free = kzalloc((sizeof(*block_ctx->datav) +
1624 sizeof(*block_ctx->pagev)) *
1625 num_pages, GFP_NOFS);
1626 if (!block_ctx->mem_to_free)
1627 return -ENOMEM;
1628 block_ctx->datav = block_ctx->mem_to_free;
1629 block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages);
1630 for (i = 0; i < num_pages; i++) {
1631 block_ctx->pagev[i] = alloc_page(GFP_NOFS);
1632 if (!block_ctx->pagev[i])
1633 return -1;
1634 }
1635
1636 dev_bytenr = block_ctx->dev_bytenr;
1637 for (i = 0; i < num_pages;) {
1638 struct bio *bio;
1639 unsigned int j;
1640
1641 bio = btrfs_io_bio_alloc(GFP_NOFS, num_pages - i);
1642 if (!bio) {
1643 pr_info("btrfsic: bio_alloc() for %u pages failed!\n",
1644 num_pages - i);
1645 return -1;
1646 }
1647 bio->bi_bdev = block_ctx->dev->bdev;
1648 bio->bi_iter.bi_sector = dev_bytenr >> 9;
1649 bio_set_op_attrs(bio, REQ_OP_READ, 0);
1650
1651 for (j = i; j < num_pages; j++) {
1652 ret = bio_add_page(bio, block_ctx->pagev[j],
1653 PAGE_SIZE, 0);
1654 if (PAGE_SIZE != ret)
1655 break;
1656 }
1657 if (j == i) {
1658 pr_info("btrfsic: error, failed to add a single page!\n");
1659 return -1;
1660 }
1661 if (submit_bio_wait(bio)) {
1662 pr_info("btrfsic: read error at logical %llu dev %s!\n",
1663 block_ctx->start, block_ctx->dev->name);
1664 bio_put(bio);
1665 return -1;
1666 }
1667 bio_put(bio);
1668 dev_bytenr += (j - i) * PAGE_SIZE;
1669 i = j;
1670 }
1671 for (i = 0; i < num_pages; i++) {
1672 block_ctx->datav[i] = kmap(block_ctx->pagev[i]);
1673 if (!block_ctx->datav[i]) {
1674 pr_info("btrfsic: kmap() failed (dev %s)!\n",
1675 block_ctx->dev->name);
1676 return -1;
1677 }
1678 }
1679
1680 return block_ctx->len;
1681}
1682
1683static void btrfsic_dump_database(struct btrfsic_state *state)
1684{
1685 const struct btrfsic_block *b_all;
1686
1687 BUG_ON(NULL == state);
1688
1689 pr_info("all_blocks_list:\n");
1690 list_for_each_entry(b_all, &state->all_blocks_list, all_blocks_node) {
1691 const struct btrfsic_block_link *l;
1692
1693 pr_info("%c-block @%llu (%s/%llu/%d)\n",
1694 btrfsic_get_block_type(state, b_all),
1695 b_all->logical_bytenr, b_all->dev_state->name,
1696 b_all->dev_bytenr, b_all->mirror_num);
1697
1698 list_for_each_entry(l, &b_all->ref_to_list, node_ref_to) {
1699 pr_info(" %c @%llu (%s/%llu/%d) refers %u* to %c @%llu (%s/%llu/%d)\n",
1700 btrfsic_get_block_type(state, b_all),
1701 b_all->logical_bytenr, b_all->dev_state->name,
1702 b_all->dev_bytenr, b_all->mirror_num,
1703 l->ref_cnt,
1704 btrfsic_get_block_type(state, l->block_ref_to),
1705 l->block_ref_to->logical_bytenr,
1706 l->block_ref_to->dev_state->name,
1707 l->block_ref_to->dev_bytenr,
1708 l->block_ref_to->mirror_num);
1709 }
1710
1711 list_for_each_entry(l, &b_all->ref_from_list, node_ref_from) {
1712 pr_info(" %c @%llu (%s/%llu/%d) is ref %u* from %c @%llu (%s/%llu/%d)\n",
1713 btrfsic_get_block_type(state, b_all),
1714 b_all->logical_bytenr, b_all->dev_state->name,
1715 b_all->dev_bytenr, b_all->mirror_num,
1716 l->ref_cnt,
1717 btrfsic_get_block_type(state, l->block_ref_from),
1718 l->block_ref_from->logical_bytenr,
1719 l->block_ref_from->dev_state->name,
1720 l->block_ref_from->dev_bytenr,
1721 l->block_ref_from->mirror_num);
1722 }
1723
1724 pr_info("\n");
1725 }
1726}
1727
1728/*
1729 * Test whether the disk block contains a tree block (leaf or node)
1730 * (note that this test fails for the super block)
1731 */
1732static int btrfsic_test_for_metadata(struct btrfsic_state *state,
1733 char **datav, unsigned int num_pages)
1734{
1735 struct btrfs_fs_info *fs_info = state->fs_info;
1736 struct btrfs_header *h;
1737 u8 csum[BTRFS_CSUM_SIZE];
1738 u32 crc = ~(u32)0;
1739 unsigned int i;
1740
1741 if (num_pages * PAGE_SIZE < state->metablock_size)
1742 return 1; /* not metadata */
1743 num_pages = state->metablock_size >> PAGE_SHIFT;
1744 h = (struct btrfs_header *)datav[0];
1745
1746 if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
1747 return 1;
1748
1749 for (i = 0; i < num_pages; i++) {
1750 u8 *data = i ? datav[i] : (datav[i] + BTRFS_CSUM_SIZE);
1751 size_t sublen = i ? PAGE_SIZE :
1752 (PAGE_SIZE - BTRFS_CSUM_SIZE);
1753
1754 crc = btrfs_crc32c(crc, data, sublen);
1755 }
1756 btrfs_csum_final(crc, csum);
1757 if (memcmp(csum, h->csum, state->csum_size))
1758 return 1;
1759
1760 return 0; /* is metadata */
1761}
1762
1763static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
1764 u64 dev_bytenr, char **mapped_datav,
1765 unsigned int num_pages,
1766 struct bio *bio, int *bio_is_patched,
1767 struct buffer_head *bh,
1768 int submit_bio_bh_rw)
1769{
1770 int is_metadata;
1771 struct btrfsic_block *block;
1772 struct btrfsic_block_data_ctx block_ctx;
1773 int ret;
1774 struct btrfsic_state *state = dev_state->state;
1775 struct block_device *bdev = dev_state->bdev;
1776 unsigned int processed_len;
1777
1778 if (NULL != bio_is_patched)
1779 *bio_is_patched = 0;
1780
1781again:
1782 if (num_pages == 0)
1783 return;
1784
1785 processed_len = 0;
1786 is_metadata = (0 == btrfsic_test_for_metadata(state, mapped_datav,
1787 num_pages));
1788
1789 block = btrfsic_block_hashtable_lookup(bdev, dev_bytenr,
1790 &state->block_hashtable);
1791 if (NULL != block) {
1792 u64 bytenr = 0;
1793 struct btrfsic_block_link *l, *tmp;
1794
1795 if (block->is_superblock) {
1796 bytenr = btrfs_super_bytenr((struct btrfs_super_block *)
1797 mapped_datav[0]);
1798 if (num_pages * PAGE_SIZE <
1799 BTRFS_SUPER_INFO_SIZE) {
1800 pr_info("btrfsic: cannot work with too short bios!\n");
1801 return;
1802 }
1803 is_metadata = 1;
1804 BUG_ON(BTRFS_SUPER_INFO_SIZE & (PAGE_SIZE - 1));
1805 processed_len = BTRFS_SUPER_INFO_SIZE;
1806 if (state->print_mask &
1807 BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE) {
1808 pr_info("[before new superblock is written]:\n");
1809 btrfsic_dump_tree_sub(state, block, 0);
1810 }
1811 }
1812 if (is_metadata) {
1813 if (!block->is_superblock) {
1814 if (num_pages * PAGE_SIZE <
1815 state->metablock_size) {
1816 pr_info("btrfsic: cannot work with too short bios!\n");
1817 return;
1818 }
1819 processed_len = state->metablock_size;
1820 bytenr = btrfs_stack_header_bytenr(
1821 (struct btrfs_header *)
1822 mapped_datav[0]);
1823 btrfsic_cmp_log_and_dev_bytenr(state, bytenr,
1824 dev_state,
1825 dev_bytenr);
1826 }
1827 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) {
1828 if (block->logical_bytenr != bytenr &&
1829 !(!block->is_metadata &&
1830 block->logical_bytenr == 0))
1831 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c, bytenr mismatch (!= stored %llu).\n",
1832 bytenr, dev_state->name,
1833 dev_bytenr,
1834 block->mirror_num,
1835 btrfsic_get_block_type(state,
1836 block),
1837 block->logical_bytenr);
1838 else
1839 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1840 bytenr, dev_state->name,
1841 dev_bytenr, block->mirror_num,
1842 btrfsic_get_block_type(state,
1843 block));
1844 }
1845 block->logical_bytenr = bytenr;
1846 } else {
1847 if (num_pages * PAGE_SIZE <
1848 state->datablock_size) {
1849 pr_info("btrfsic: cannot work with too short bios!\n");
1850 return;
1851 }
1852 processed_len = state->datablock_size;
1853 bytenr = block->logical_bytenr;
1854 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1855 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1856 bytenr, dev_state->name, dev_bytenr,
1857 block->mirror_num,
1858 btrfsic_get_block_type(state, block));
1859 }
1860
1861 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1862 pr_info("ref_to_list: %cE, ref_from_list: %cE\n",
1863 list_empty(&block->ref_to_list) ? ' ' : '!',
1864 list_empty(&block->ref_from_list) ? ' ' : '!');
1865 if (btrfsic_is_block_ref_by_superblock(state, block, 0)) {
1866 pr_info("btrfs: attempt to overwrite %c-block @%llu (%s/%llu/%d), old(gen=%llu, objectid=%llu, type=%d, offset=%llu), new(gen=%llu), which is referenced by most recent superblock (superblockgen=%llu)!\n",
1867 btrfsic_get_block_type(state, block), bytenr,
1868 dev_state->name, dev_bytenr, block->mirror_num,
1869 block->generation,
1870 btrfs_disk_key_objectid(&block->disk_key),
1871 block->disk_key.type,
1872 btrfs_disk_key_offset(&block->disk_key),
1873 btrfs_stack_header_generation(
1874 (struct btrfs_header *) mapped_datav[0]),
1875 state->max_superblock_generation);
1876 btrfsic_dump_tree(state);
1877 }
1878
1879 if (!block->is_iodone && !block->never_written) {
1880 pr_info("btrfs: attempt to overwrite %c-block @%llu (%s/%llu/%d), oldgen=%llu, newgen=%llu, which is not yet iodone!\n",
1881 btrfsic_get_block_type(state, block), bytenr,
1882 dev_state->name, dev_bytenr, block->mirror_num,
1883 block->generation,
1884 btrfs_stack_header_generation(
1885 (struct btrfs_header *)
1886 mapped_datav[0]));
1887 /* it would not be safe to go on */
1888 btrfsic_dump_tree(state);
1889 goto continue_loop;
1890 }
1891
1892 /*
1893 * Clear all references of this block. Do not free
1894 * the block itself even if is not referenced anymore
1895 * because it still carries valuable information
1896 * like whether it was ever written and IO completed.
1897 */
1898 list_for_each_entry_safe(l, tmp, &block->ref_to_list,
1899 node_ref_to) {
1900 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1901 btrfsic_print_rem_link(state, l);
1902 l->ref_cnt--;
1903 if (0 == l->ref_cnt) {
1904 list_del(&l->node_ref_to);
1905 list_del(&l->node_ref_from);
1906 btrfsic_block_link_hashtable_remove(l);
1907 btrfsic_block_link_free(l);
1908 }
1909 }
1910
1911 block_ctx.dev = dev_state;
1912 block_ctx.dev_bytenr = dev_bytenr;
1913 block_ctx.start = bytenr;
1914 block_ctx.len = processed_len;
1915 block_ctx.pagev = NULL;
1916 block_ctx.mem_to_free = NULL;
1917 block_ctx.datav = mapped_datav;
1918
1919 if (is_metadata || state->include_extent_data) {
1920 block->never_written = 0;
1921 block->iodone_w_error = 0;
1922 if (NULL != bio) {
1923 block->is_iodone = 0;
1924 BUG_ON(NULL == bio_is_patched);
1925 if (!*bio_is_patched) {
1926 block->orig_bio_bh_private =
1927 bio->bi_private;
1928 block->orig_bio_bh_end_io.bio =
1929 bio->bi_end_io;
1930 block->next_in_same_bio = NULL;
1931 bio->bi_private = block;
1932 bio->bi_end_io = btrfsic_bio_end_io;
1933 *bio_is_patched = 1;
1934 } else {
1935 struct btrfsic_block *chained_block =
1936 (struct btrfsic_block *)
1937 bio->bi_private;
1938
1939 BUG_ON(NULL == chained_block);
1940 block->orig_bio_bh_private =
1941 chained_block->orig_bio_bh_private;
1942 block->orig_bio_bh_end_io.bio =
1943 chained_block->orig_bio_bh_end_io.
1944 bio;
1945 block->next_in_same_bio = chained_block;
1946 bio->bi_private = block;
1947 }
1948 } else if (NULL != bh) {
1949 block->is_iodone = 0;
1950 block->orig_bio_bh_private = bh->b_private;
1951 block->orig_bio_bh_end_io.bh = bh->b_end_io;
1952 block->next_in_same_bio = NULL;
1953 bh->b_private = block;
1954 bh->b_end_io = btrfsic_bh_end_io;
1955 } else {
1956 block->is_iodone = 1;
1957 block->orig_bio_bh_private = NULL;
1958 block->orig_bio_bh_end_io.bio = NULL;
1959 block->next_in_same_bio = NULL;
1960 }
1961 }
1962
1963 block->flush_gen = dev_state->last_flush_gen + 1;
1964 block->submit_bio_bh_rw = submit_bio_bh_rw;
1965 if (is_metadata) {
1966 block->logical_bytenr = bytenr;
1967 block->is_metadata = 1;
1968 if (block->is_superblock) {
1969 BUG_ON(PAGE_SIZE !=
1970 BTRFS_SUPER_INFO_SIZE);
1971 ret = btrfsic_process_written_superblock(
1972 state,
1973 block,
1974 (struct btrfs_super_block *)
1975 mapped_datav[0]);
1976 if (state->print_mask &
1977 BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE) {
1978 pr_info("[after new superblock is written]:\n");
1979 btrfsic_dump_tree_sub(state, block, 0);
1980 }
1981 } else {
1982 block->mirror_num = 0; /* unknown */
1983 ret = btrfsic_process_metablock(
1984 state,
1985 block,
1986 &block_ctx,
1987 0, 0);
1988 }
1989 if (ret)
1990 pr_info("btrfsic: btrfsic_process_metablock(root @%llu) failed!\n",
1991 dev_bytenr);
1992 } else {
1993 block->is_metadata = 0;
1994 block->mirror_num = 0; /* unknown */
1995 block->generation = BTRFSIC_GENERATION_UNKNOWN;
1996 if (!state->include_extent_data
1997 && list_empty(&block->ref_from_list)) {
1998 /*
1999 * disk block is overwritten with extent
2000 * data (not meta data) and we are configured
2001 * to not include extent data: take the
2002 * chance and free the block's memory
2003 */
2004 btrfsic_block_hashtable_remove(block);
2005 list_del(&block->all_blocks_node);
2006 btrfsic_block_free(block);
2007 }
2008 }
2009 btrfsic_release_block_ctx(&block_ctx);
2010 } else {
2011 /* block has not been found in hash table */
2012 u64 bytenr;
2013
2014 if (!is_metadata) {
2015 processed_len = state->datablock_size;
2016 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2017 pr_info("Written block (%s/%llu/?) !found in hash table, D.\n",
2018 dev_state->name, dev_bytenr);
2019 if (!state->include_extent_data) {
2020 /* ignore that written D block */
2021 goto continue_loop;
2022 }
2023
2024 /* this is getting ugly for the
2025 * include_extent_data case... */
2026 bytenr = 0; /* unknown */
2027 } else {
2028 processed_len = state->metablock_size;
2029 bytenr = btrfs_stack_header_bytenr(
2030 (struct btrfs_header *)
2031 mapped_datav[0]);
2032 btrfsic_cmp_log_and_dev_bytenr(state, bytenr, dev_state,
2033 dev_bytenr);
2034 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2035 pr_info("Written block @%llu (%s/%llu/?) !found in hash table, M.\n",
2036 bytenr, dev_state->name, dev_bytenr);
2037 }
2038
2039 block_ctx.dev = dev_state;
2040 block_ctx.dev_bytenr = dev_bytenr;
2041 block_ctx.start = bytenr;
2042 block_ctx.len = processed_len;
2043 block_ctx.pagev = NULL;
2044 block_ctx.mem_to_free = NULL;
2045 block_ctx.datav = mapped_datav;
2046
2047 block = btrfsic_block_alloc();
2048 if (NULL == block) {
2049 pr_info("btrfsic: error, kmalloc failed!\n");
2050 btrfsic_release_block_ctx(&block_ctx);
2051 goto continue_loop;
2052 }
2053 block->dev_state = dev_state;
2054 block->dev_bytenr = dev_bytenr;
2055 block->logical_bytenr = bytenr;
2056 block->is_metadata = is_metadata;
2057 block->never_written = 0;
2058 block->iodone_w_error = 0;
2059 block->mirror_num = 0; /* unknown */
2060 block->flush_gen = dev_state->last_flush_gen + 1;
2061 block->submit_bio_bh_rw = submit_bio_bh_rw;
2062 if (NULL != bio) {
2063 block->is_iodone = 0;
2064 BUG_ON(NULL == bio_is_patched);
2065 if (!*bio_is_patched) {
2066 block->orig_bio_bh_private = bio->bi_private;
2067 block->orig_bio_bh_end_io.bio = bio->bi_end_io;
2068 block->next_in_same_bio = NULL;
2069 bio->bi_private = block;
2070 bio->bi_end_io = btrfsic_bio_end_io;
2071 *bio_is_patched = 1;
2072 } else {
2073 struct btrfsic_block *chained_block =
2074 (struct btrfsic_block *)
2075 bio->bi_private;
2076
2077 BUG_ON(NULL == chained_block);
2078 block->orig_bio_bh_private =
2079 chained_block->orig_bio_bh_private;
2080 block->orig_bio_bh_end_io.bio =
2081 chained_block->orig_bio_bh_end_io.bio;
2082 block->next_in_same_bio = chained_block;
2083 bio->bi_private = block;
2084 }
2085 } else if (NULL != bh) {
2086 block->is_iodone = 0;
2087 block->orig_bio_bh_private = bh->b_private;
2088 block->orig_bio_bh_end_io.bh = bh->b_end_io;
2089 block->next_in_same_bio = NULL;
2090 bh->b_private = block;
2091 bh->b_end_io = btrfsic_bh_end_io;
2092 } else {
2093 block->is_iodone = 1;
2094 block->orig_bio_bh_private = NULL;
2095 block->orig_bio_bh_end_io.bio = NULL;
2096 block->next_in_same_bio = NULL;
2097 }
2098 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2099 pr_info("New written %c-block @%llu (%s/%llu/%d)\n",
2100 is_metadata ? 'M' : 'D',
2101 block->logical_bytenr, block->dev_state->name,
2102 block->dev_bytenr, block->mirror_num);
2103 list_add(&block->all_blocks_node, &state->all_blocks_list);
2104 btrfsic_block_hashtable_add(block, &state->block_hashtable);
2105
2106 if (is_metadata) {
2107 ret = btrfsic_process_metablock(state, block,
2108 &block_ctx, 0, 0);
2109 if (ret)
2110 pr_info("btrfsic: process_metablock(root @%llu) failed!\n",
2111 dev_bytenr);
2112 }
2113 btrfsic_release_block_ctx(&block_ctx);
2114 }
2115
2116continue_loop:
2117 BUG_ON(!processed_len);
2118 dev_bytenr += processed_len;
2119 mapped_datav += processed_len >> PAGE_SHIFT;
2120 num_pages -= processed_len >> PAGE_SHIFT;
2121 goto again;
2122}
2123
2124static void btrfsic_bio_end_io(struct bio *bp)
2125{
2126 struct btrfsic_block *block = (struct btrfsic_block *)bp->bi_private;
2127 int iodone_w_error;
2128
2129 /* mutex is not held! This is not save if IO is not yet completed
2130 * on umount */
2131 iodone_w_error = 0;
2132 if (bp->bi_error)
2133 iodone_w_error = 1;
2134
2135 BUG_ON(NULL == block);
2136 bp->bi_private = block->orig_bio_bh_private;
2137 bp->bi_end_io = block->orig_bio_bh_end_io.bio;
2138
2139 do {
2140 struct btrfsic_block *next_block;
2141 struct btrfsic_dev_state *const dev_state = block->dev_state;
2142
2143 if ((dev_state->state->print_mask &
2144 BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2145 pr_info("bio_end_io(err=%d) for %c @%llu (%s/%llu/%d)\n",
2146 bp->bi_error,
2147 btrfsic_get_block_type(dev_state->state, block),
2148 block->logical_bytenr, dev_state->name,
2149 block->dev_bytenr, block->mirror_num);
2150 next_block = block->next_in_same_bio;
2151 block->iodone_w_error = iodone_w_error;
2152 if (block->submit_bio_bh_rw & REQ_PREFLUSH) {
2153 dev_state->last_flush_gen++;
2154 if ((dev_state->state->print_mask &
2155 BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2156 pr_info("bio_end_io() new %s flush_gen=%llu\n",
2157 dev_state->name,
2158 dev_state->last_flush_gen);
2159 }
2160 if (block->submit_bio_bh_rw & REQ_FUA)
2161 block->flush_gen = 0; /* FUA completed means block is
2162 * on disk */
2163 block->is_iodone = 1; /* for FLUSH, this releases the block */
2164 block = next_block;
2165 } while (NULL != block);
2166
2167 bp->bi_end_io(bp);
2168}
2169
2170static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate)
2171{
2172 struct btrfsic_block *block = (struct btrfsic_block *)bh->b_private;
2173 int iodone_w_error = !uptodate;
2174 struct btrfsic_dev_state *dev_state;
2175
2176 BUG_ON(NULL == block);
2177 dev_state = block->dev_state;
2178 if ((dev_state->state->print_mask & BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2179 pr_info("bh_end_io(error=%d) for %c @%llu (%s/%llu/%d)\n",
2180 iodone_w_error,
2181 btrfsic_get_block_type(dev_state->state, block),
2182 block->logical_bytenr, block->dev_state->name,
2183 block->dev_bytenr, block->mirror_num);
2184
2185 block->iodone_w_error = iodone_w_error;
2186 if (block->submit_bio_bh_rw & REQ_PREFLUSH) {
2187 dev_state->last_flush_gen++;
2188 if ((dev_state->state->print_mask &
2189 BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2190 pr_info("bh_end_io() new %s flush_gen=%llu\n",
2191 dev_state->name, dev_state->last_flush_gen);
2192 }
2193 if (block->submit_bio_bh_rw & REQ_FUA)
2194 block->flush_gen = 0; /* FUA completed means block is on disk */
2195
2196 bh->b_private = block->orig_bio_bh_private;
2197 bh->b_end_io = block->orig_bio_bh_end_io.bh;
2198 block->is_iodone = 1; /* for FLUSH, this releases the block */
2199 bh->b_end_io(bh, uptodate);
2200}
2201
2202static int btrfsic_process_written_superblock(
2203 struct btrfsic_state *state,
2204 struct btrfsic_block *const superblock,
2205 struct btrfs_super_block *const super_hdr)
2206{
2207 struct btrfs_fs_info *fs_info = state->fs_info;
2208 int pass;
2209
2210 superblock->generation = btrfs_super_generation(super_hdr);
2211 if (!(superblock->generation > state->max_superblock_generation ||
2212 0 == state->max_superblock_generation)) {
2213 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
2214 pr_info("btrfsic: superblock @%llu (%s/%llu/%d) with old gen %llu <= %llu\n",
2215 superblock->logical_bytenr,
2216 superblock->dev_state->name,
2217 superblock->dev_bytenr, superblock->mirror_num,
2218 btrfs_super_generation(super_hdr),
2219 state->max_superblock_generation);
2220 } else {
2221 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
2222 pr_info("btrfsic: got new superblock @%llu (%s/%llu/%d) with new gen %llu > %llu\n",
2223 superblock->logical_bytenr,
2224 superblock->dev_state->name,
2225 superblock->dev_bytenr, superblock->mirror_num,
2226 btrfs_super_generation(super_hdr),
2227 state->max_superblock_generation);
2228
2229 state->max_superblock_generation =
2230 btrfs_super_generation(super_hdr);
2231 state->latest_superblock = superblock;
2232 }
2233
2234 for (pass = 0; pass < 3; pass++) {
2235 int ret;
2236 u64 next_bytenr;
2237 struct btrfsic_block *next_block;
2238 struct btrfsic_block_data_ctx tmp_next_block_ctx;
2239 struct btrfsic_block_link *l;
2240 int num_copies;
2241 int mirror_num;
2242 const char *additional_string = NULL;
2243 struct btrfs_disk_key tmp_disk_key = {0};
2244
2245 btrfs_set_disk_key_objectid(&tmp_disk_key,
2246 BTRFS_ROOT_ITEM_KEY);
2247 btrfs_set_disk_key_objectid(&tmp_disk_key, 0);
2248
2249 switch (pass) {
2250 case 0:
2251 btrfs_set_disk_key_objectid(&tmp_disk_key,
2252 BTRFS_ROOT_TREE_OBJECTID);
2253 additional_string = "root ";
2254 next_bytenr = btrfs_super_root(super_hdr);
2255 if (state->print_mask &
2256 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2257 pr_info("root@%llu\n", next_bytenr);
2258 break;
2259 case 1:
2260 btrfs_set_disk_key_objectid(&tmp_disk_key,
2261 BTRFS_CHUNK_TREE_OBJECTID);
2262 additional_string = "chunk ";
2263 next_bytenr = btrfs_super_chunk_root(super_hdr);
2264 if (state->print_mask &
2265 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2266 pr_info("chunk@%llu\n", next_bytenr);
2267 break;
2268 case 2:
2269 btrfs_set_disk_key_objectid(&tmp_disk_key,
2270 BTRFS_TREE_LOG_OBJECTID);
2271 additional_string = "log ";
2272 next_bytenr = btrfs_super_log_root(super_hdr);
2273 if (0 == next_bytenr)
2274 continue;
2275 if (state->print_mask &
2276 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2277 pr_info("log@%llu\n", next_bytenr);
2278 break;
2279 }
2280
2281 num_copies = btrfs_num_copies(fs_info, next_bytenr,
2282 BTRFS_SUPER_INFO_SIZE);
2283 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
2284 pr_info("num_copies(log_bytenr=%llu) = %d\n",
2285 next_bytenr, num_copies);
2286 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2287 int was_created;
2288
2289 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2290 pr_info("btrfsic_process_written_superblock(mirror_num=%d)\n", mirror_num);
2291 ret = btrfsic_map_block(state, next_bytenr,
2292 BTRFS_SUPER_INFO_SIZE,
2293 &tmp_next_block_ctx,
2294 mirror_num);
2295 if (ret) {
2296 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
2297 next_bytenr, mirror_num);
2298 return -1;
2299 }
2300
2301 next_block = btrfsic_block_lookup_or_add(
2302 state,
2303 &tmp_next_block_ctx,
2304 additional_string,
2305 1, 0, 1,
2306 mirror_num,
2307 &was_created);
2308 if (NULL == next_block) {
2309 pr_info("btrfsic: error, kmalloc failed!\n");
2310 btrfsic_release_block_ctx(&tmp_next_block_ctx);
2311 return -1;
2312 }
2313
2314 next_block->disk_key = tmp_disk_key;
2315 if (was_created)
2316 next_block->generation =
2317 BTRFSIC_GENERATION_UNKNOWN;
2318 l = btrfsic_block_link_lookup_or_add(
2319 state,
2320 &tmp_next_block_ctx,
2321 next_block,
2322 superblock,
2323 BTRFSIC_GENERATION_UNKNOWN);
2324 btrfsic_release_block_ctx(&tmp_next_block_ctx);
2325 if (NULL == l)
2326 return -1;
2327 }
2328 }
2329
2330 if (WARN_ON(-1 == btrfsic_check_all_ref_blocks(state, superblock, 0)))
2331 btrfsic_dump_tree(state);
2332
2333 return 0;
2334}
2335
2336static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state,
2337 struct btrfsic_block *const block,
2338 int recursion_level)
2339{
2340 const struct btrfsic_block_link *l;
2341 int ret = 0;
2342
2343 if (recursion_level >= 3 + BTRFS_MAX_LEVEL) {
2344 /*
2345 * Note that this situation can happen and does not
2346 * indicate an error in regular cases. It happens
2347 * when disk blocks are freed and later reused.
2348 * The check-integrity module is not aware of any
2349 * block free operations, it just recognizes block
2350 * write operations. Therefore it keeps the linkage
2351 * information for a block until a block is
2352 * rewritten. This can temporarily cause incorrect
2353 * and even circular linkage informations. This
2354 * causes no harm unless such blocks are referenced
2355 * by the most recent super block.
2356 */
2357 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2358 pr_info("btrfsic: abort cyclic linkage (case 1).\n");
2359
2360 return ret;
2361 }
2362
2363 /*
2364 * This algorithm is recursive because the amount of used stack
2365 * space is very small and the max recursion depth is limited.
2366 */
2367 list_for_each_entry(l, &block->ref_to_list, node_ref_to) {
2368 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2369 pr_info("rl=%d, %c @%llu (%s/%llu/%d) %u* refers to %c @%llu (%s/%llu/%d)\n",
2370 recursion_level,
2371 btrfsic_get_block_type(state, block),
2372 block->logical_bytenr, block->dev_state->name,
2373 block->dev_bytenr, block->mirror_num,
2374 l->ref_cnt,
2375 btrfsic_get_block_type(state, l->block_ref_to),
2376 l->block_ref_to->logical_bytenr,
2377 l->block_ref_to->dev_state->name,
2378 l->block_ref_to->dev_bytenr,
2379 l->block_ref_to->mirror_num);
2380 if (l->block_ref_to->never_written) {
2381 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is never written!\n",
2382 btrfsic_get_block_type(state, l->block_ref_to),
2383 l->block_ref_to->logical_bytenr,
2384 l->block_ref_to->dev_state->name,
2385 l->block_ref_to->dev_bytenr,
2386 l->block_ref_to->mirror_num);
2387 ret = -1;
2388 } else if (!l->block_ref_to->is_iodone) {
2389 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is not yet iodone!\n",
2390 btrfsic_get_block_type(state, l->block_ref_to),
2391 l->block_ref_to->logical_bytenr,
2392 l->block_ref_to->dev_state->name,
2393 l->block_ref_to->dev_bytenr,
2394 l->block_ref_to->mirror_num);
2395 ret = -1;
2396 } else if (l->block_ref_to->iodone_w_error) {
2397 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which has write error!\n",
2398 btrfsic_get_block_type(state, l->block_ref_to),
2399 l->block_ref_to->logical_bytenr,
2400 l->block_ref_to->dev_state->name,
2401 l->block_ref_to->dev_bytenr,
2402 l->block_ref_to->mirror_num);
2403 ret = -1;
2404 } else if (l->parent_generation !=
2405 l->block_ref_to->generation &&
2406 BTRFSIC_GENERATION_UNKNOWN !=
2407 l->parent_generation &&
2408 BTRFSIC_GENERATION_UNKNOWN !=
2409 l->block_ref_to->generation) {
2410 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) with generation %llu != parent generation %llu!\n",
2411 btrfsic_get_block_type(state, l->block_ref_to),
2412 l->block_ref_to->logical_bytenr,
2413 l->block_ref_to->dev_state->name,
2414 l->block_ref_to->dev_bytenr,
2415 l->block_ref_to->mirror_num,
2416 l->block_ref_to->generation,
2417 l->parent_generation);
2418 ret = -1;
2419 } else if (l->block_ref_to->flush_gen >
2420 l->block_ref_to->dev_state->last_flush_gen) {
2421 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is not flushed out of disk's write cache (block flush_gen=%llu, dev->flush_gen=%llu)!\n",
2422 btrfsic_get_block_type(state, l->block_ref_to),
2423 l->block_ref_to->logical_bytenr,
2424 l->block_ref_to->dev_state->name,
2425 l->block_ref_to->dev_bytenr,
2426 l->block_ref_to->mirror_num, block->flush_gen,
2427 l->block_ref_to->dev_state->last_flush_gen);
2428 ret = -1;
2429 } else if (-1 == btrfsic_check_all_ref_blocks(state,
2430 l->block_ref_to,
2431 recursion_level +
2432 1)) {
2433 ret = -1;
2434 }
2435 }
2436
2437 return ret;
2438}
2439
2440static int btrfsic_is_block_ref_by_superblock(
2441 const struct btrfsic_state *state,
2442 const struct btrfsic_block *block,
2443 int recursion_level)
2444{
2445 const struct btrfsic_block_link *l;
2446
2447 if (recursion_level >= 3 + BTRFS_MAX_LEVEL) {
2448 /* refer to comment at "abort cyclic linkage (case 1)" */
2449 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2450 pr_info("btrfsic: abort cyclic linkage (case 2).\n");
2451
2452 return 0;
2453 }
2454
2455 /*
2456 * This algorithm is recursive because the amount of used stack space
2457 * is very small and the max recursion depth is limited.
2458 */
2459 list_for_each_entry(l, &block->ref_from_list, node_ref_from) {
2460 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2461 pr_info("rl=%d, %c @%llu (%s/%llu/%d) is ref %u* from %c @%llu (%s/%llu/%d)\n",
2462 recursion_level,
2463 btrfsic_get_block_type(state, block),
2464 block->logical_bytenr, block->dev_state->name,
2465 block->dev_bytenr, block->mirror_num,
2466 l->ref_cnt,
2467 btrfsic_get_block_type(state, l->block_ref_from),
2468 l->block_ref_from->logical_bytenr,
2469 l->block_ref_from->dev_state->name,
2470 l->block_ref_from->dev_bytenr,
2471 l->block_ref_from->mirror_num);
2472 if (l->block_ref_from->is_superblock &&
2473 state->latest_superblock->dev_bytenr ==
2474 l->block_ref_from->dev_bytenr &&
2475 state->latest_superblock->dev_state->bdev ==
2476 l->block_ref_from->dev_state->bdev)
2477 return 1;
2478 else if (btrfsic_is_block_ref_by_superblock(state,
2479 l->block_ref_from,
2480 recursion_level +
2481 1))
2482 return 1;
2483 }
2484
2485 return 0;
2486}
2487
2488static void btrfsic_print_add_link(const struct btrfsic_state *state,
2489 const struct btrfsic_block_link *l)
2490{
2491 pr_info("Add %u* link from %c @%llu (%s/%llu/%d) to %c @%llu (%s/%llu/%d).\n",
2492 l->ref_cnt,
2493 btrfsic_get_block_type(state, l->block_ref_from),
2494 l->block_ref_from->logical_bytenr,
2495 l->block_ref_from->dev_state->name,
2496 l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num,
2497 btrfsic_get_block_type(state, l->block_ref_to),
2498 l->block_ref_to->logical_bytenr,
2499 l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr,
2500 l->block_ref_to->mirror_num);
2501}
2502
2503static void btrfsic_print_rem_link(const struct btrfsic_state *state,
2504 const struct btrfsic_block_link *l)
2505{
2506 pr_info("Rem %u* link from %c @%llu (%s/%llu/%d) to %c @%llu (%s/%llu/%d).\n",
2507 l->ref_cnt,
2508 btrfsic_get_block_type(state, l->block_ref_from),
2509 l->block_ref_from->logical_bytenr,
2510 l->block_ref_from->dev_state->name,
2511 l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num,
2512 btrfsic_get_block_type(state, l->block_ref_to),
2513 l->block_ref_to->logical_bytenr,
2514 l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr,
2515 l->block_ref_to->mirror_num);
2516}
2517
2518static char btrfsic_get_block_type(const struct btrfsic_state *state,
2519 const struct btrfsic_block *block)
2520{
2521 if (block->is_superblock &&
2522 state->latest_superblock->dev_bytenr == block->dev_bytenr &&
2523 state->latest_superblock->dev_state->bdev == block->dev_state->bdev)
2524 return 'S';
2525 else if (block->is_superblock)
2526 return 's';
2527 else if (block->is_metadata)
2528 return 'M';
2529 else
2530 return 'D';
2531}
2532
2533static void btrfsic_dump_tree(const struct btrfsic_state *state)
2534{
2535 btrfsic_dump_tree_sub(state, state->latest_superblock, 0);
2536}
2537
2538static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
2539 const struct btrfsic_block *block,
2540 int indent_level)
2541{
2542 const struct btrfsic_block_link *l;
2543 int indent_add;
2544 static char buf[80];
2545 int cursor_position;
2546
2547 /*
2548 * Should better fill an on-stack buffer with a complete line and
2549 * dump it at once when it is time to print a newline character.
2550 */
2551
2552 /*
2553 * This algorithm is recursive because the amount of used stack space
2554 * is very small and the max recursion depth is limited.
2555 */
2556 indent_add = sprintf(buf, "%c-%llu(%s/%llu/%u)",
2557 btrfsic_get_block_type(state, block),
2558 block->logical_bytenr, block->dev_state->name,
2559 block->dev_bytenr, block->mirror_num);
2560 if (indent_level + indent_add > BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
2561 printk("[...]\n");
2562 return;
2563 }
2564 printk(buf);
2565 indent_level += indent_add;
2566 if (list_empty(&block->ref_to_list)) {
2567 printk("\n");
2568 return;
2569 }
2570 if (block->mirror_num > 1 &&
2571 !(state->print_mask & BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS)) {
2572 printk(" [...]\n");
2573 return;
2574 }
2575
2576 cursor_position = indent_level;
2577 list_for_each_entry(l, &block->ref_to_list, node_ref_to) {
2578 while (cursor_position < indent_level) {
2579 printk(" ");
2580 cursor_position++;
2581 }
2582 if (l->ref_cnt > 1)
2583 indent_add = sprintf(buf, " %d*--> ", l->ref_cnt);
2584 else
2585 indent_add = sprintf(buf, " --> ");
2586 if (indent_level + indent_add >
2587 BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
2588 printk("[...]\n");
2589 cursor_position = 0;
2590 continue;
2591 }
2592
2593 printk(buf);
2594
2595 btrfsic_dump_tree_sub(state, l->block_ref_to,
2596 indent_level + indent_add);
2597 cursor_position = 0;
2598 }
2599}
2600
2601static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
2602 struct btrfsic_state *state,
2603 struct btrfsic_block_data_ctx *next_block_ctx,
2604 struct btrfsic_block *next_block,
2605 struct btrfsic_block *from_block,
2606 u64 parent_generation)
2607{
2608 struct btrfsic_block_link *l;
2609
2610 l = btrfsic_block_link_hashtable_lookup(next_block_ctx->dev->bdev,
2611 next_block_ctx->dev_bytenr,
2612 from_block->dev_state->bdev,
2613 from_block->dev_bytenr,
2614 &state->block_link_hashtable);
2615 if (NULL == l) {
2616 l = btrfsic_block_link_alloc();
2617 if (NULL == l) {
2618 pr_info("btrfsic: error, kmalloc failed!\n");
2619 return NULL;
2620 }
2621
2622 l->block_ref_to = next_block;
2623 l->block_ref_from = from_block;
2624 l->ref_cnt = 1;
2625 l->parent_generation = parent_generation;
2626
2627 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2628 btrfsic_print_add_link(state, l);
2629
2630 list_add(&l->node_ref_to, &from_block->ref_to_list);
2631 list_add(&l->node_ref_from, &next_block->ref_from_list);
2632
2633 btrfsic_block_link_hashtable_add(l,
2634 &state->block_link_hashtable);
2635 } else {
2636 l->ref_cnt++;
2637 l->parent_generation = parent_generation;
2638 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2639 btrfsic_print_add_link(state, l);
2640 }
2641
2642 return l;
2643}
2644
2645static struct btrfsic_block *btrfsic_block_lookup_or_add(
2646 struct btrfsic_state *state,
2647 struct btrfsic_block_data_ctx *block_ctx,
2648 const char *additional_string,
2649 int is_metadata,
2650 int is_iodone,
2651 int never_written,
2652 int mirror_num,
2653 int *was_created)
2654{
2655 struct btrfsic_block *block;
2656
2657 block = btrfsic_block_hashtable_lookup(block_ctx->dev->bdev,
2658 block_ctx->dev_bytenr,
2659 &state->block_hashtable);
2660 if (NULL == block) {
2661 struct btrfsic_dev_state *dev_state;
2662
2663 block = btrfsic_block_alloc();
2664 if (NULL == block) {
2665 pr_info("btrfsic: error, kmalloc failed!\n");
2666 return NULL;
2667 }
2668 dev_state = btrfsic_dev_state_lookup(block_ctx->dev->bdev);
2669 if (NULL == dev_state) {
2670 pr_info("btrfsic: error, lookup dev_state failed!\n");
2671 btrfsic_block_free(block);
2672 return NULL;
2673 }
2674 block->dev_state = dev_state;
2675 block->dev_bytenr = block_ctx->dev_bytenr;
2676 block->logical_bytenr = block_ctx->start;
2677 block->is_metadata = is_metadata;
2678 block->is_iodone = is_iodone;
2679 block->never_written = never_written;
2680 block->mirror_num = mirror_num;
2681 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2682 pr_info("New %s%c-block @%llu (%s/%llu/%d)\n",
2683 additional_string,
2684 btrfsic_get_block_type(state, block),
2685 block->logical_bytenr, dev_state->name,
2686 block->dev_bytenr, mirror_num);
2687 list_add(&block->all_blocks_node, &state->all_blocks_list);
2688 btrfsic_block_hashtable_add(block, &state->block_hashtable);
2689 if (NULL != was_created)
2690 *was_created = 1;
2691 } else {
2692 if (NULL != was_created)
2693 *was_created = 0;
2694 }
2695
2696 return block;
2697}
2698
2699static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
2700 u64 bytenr,
2701 struct btrfsic_dev_state *dev_state,
2702 u64 dev_bytenr)
2703{
2704 struct btrfs_fs_info *fs_info = state->fs_info;
2705 struct btrfsic_block_data_ctx block_ctx;
2706 int num_copies;
2707 int mirror_num;
2708 int match = 0;
2709 int ret;
2710
2711 num_copies = btrfs_num_copies(fs_info, bytenr, state->metablock_size);
2712
2713 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2714 ret = btrfsic_map_block(state, bytenr, state->metablock_size,
2715 &block_ctx, mirror_num);
2716 if (ret) {
2717 pr_info("btrfsic: btrfsic_map_block(logical @%llu, mirror %d) failed!\n",
2718 bytenr, mirror_num);
2719 continue;
2720 }
2721
2722 if (dev_state->bdev == block_ctx.dev->bdev &&
2723 dev_bytenr == block_ctx.dev_bytenr) {
2724 match++;
2725 btrfsic_release_block_ctx(&block_ctx);
2726 break;
2727 }
2728 btrfsic_release_block_ctx(&block_ctx);
2729 }
2730
2731 if (WARN_ON(!match)) {
2732 pr_info("btrfs: attempt to write M-block which contains logical bytenr that doesn't map to dev+physical bytenr of submit_bio, buffer->log_bytenr=%llu, submit_bio(bdev=%s, phys_bytenr=%llu)!\n",
2733 bytenr, dev_state->name, dev_bytenr);
2734 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2735 ret = btrfsic_map_block(state, bytenr,
2736 state->metablock_size,
2737 &block_ctx, mirror_num);
2738 if (ret)
2739 continue;
2740
2741 pr_info("Read logical bytenr @%llu maps to (%s/%llu/%d)\n",
2742 bytenr, block_ctx.dev->name,
2743 block_ctx.dev_bytenr, mirror_num);
2744 }
2745 }
2746}
2747
2748static struct btrfsic_dev_state *btrfsic_dev_state_lookup(
2749 struct block_device *bdev)
2750{
2751 return btrfsic_dev_state_hashtable_lookup(bdev,
2752 &btrfsic_dev_state_hashtable);
2753}
2754
2755int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
2756{
2757 struct btrfsic_dev_state *dev_state;
2758
2759 if (!btrfsic_is_initialized)
2760 return submit_bh(op, op_flags, bh);
2761
2762 mutex_lock(&btrfsic_mutex);
2763 /* since btrfsic_submit_bh() might also be called before
2764 * btrfsic_mount(), this might return NULL */
2765 dev_state = btrfsic_dev_state_lookup(bh->b_bdev);
2766
2767 /* Only called to write the superblock (incl. FLUSH/FUA) */
2768 if (NULL != dev_state &&
2769 (op == REQ_OP_WRITE) && bh->b_size > 0) {
2770 u64 dev_bytenr;
2771
2772 dev_bytenr = 4096 * bh->b_blocknr;
2773 if (dev_state->state->print_mask &
2774 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2775 pr_info("submit_bh(op=0x%x,0x%x, blocknr=%llu (bytenr %llu), size=%zu, data=%p, bdev=%p)\n",
2776 op, op_flags, (unsigned long long)bh->b_blocknr,
2777 dev_bytenr, bh->b_size, bh->b_data, bh->b_bdev);
2778 btrfsic_process_written_block(dev_state, dev_bytenr,
2779 &bh->b_data, 1, NULL,
2780 NULL, bh, op_flags);
2781 } else if (NULL != dev_state && (op_flags & REQ_PREFLUSH)) {
2782 if (dev_state->state->print_mask &
2783 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2784 pr_info("submit_bh(op=0x%x,0x%x FLUSH, bdev=%p)\n",
2785 op, op_flags, bh->b_bdev);
2786 if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
2787 if ((dev_state->state->print_mask &
2788 (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
2789 BTRFSIC_PRINT_MASK_VERBOSE)))
2790 pr_info("btrfsic_submit_bh(%s) with FLUSH but dummy block already in use (ignored)!\n",
2791 dev_state->name);
2792 } else {
2793 struct btrfsic_block *const block =
2794 &dev_state->dummy_block_for_bio_bh_flush;
2795
2796 block->is_iodone = 0;
2797 block->never_written = 0;
2798 block->iodone_w_error = 0;
2799 block->flush_gen = dev_state->last_flush_gen + 1;
2800 block->submit_bio_bh_rw = op_flags;
2801 block->orig_bio_bh_private = bh->b_private;
2802 block->orig_bio_bh_end_io.bh = bh->b_end_io;
2803 block->next_in_same_bio = NULL;
2804 bh->b_private = block;
2805 bh->b_end_io = btrfsic_bh_end_io;
2806 }
2807 }
2808 mutex_unlock(&btrfsic_mutex);
2809 return submit_bh(op, op_flags, bh);
2810}
2811
2812static void __btrfsic_submit_bio(struct bio *bio)
2813{
2814 struct btrfsic_dev_state *dev_state;
2815
2816 if (!btrfsic_is_initialized)
2817 return;
2818
2819 mutex_lock(&btrfsic_mutex);
2820 /* since btrfsic_submit_bio() is also called before
2821 * btrfsic_mount(), this might return NULL */
2822 dev_state = btrfsic_dev_state_lookup(bio->bi_bdev);
2823 if (NULL != dev_state &&
2824 (bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) {
2825 unsigned int i;
2826 u64 dev_bytenr;
2827 u64 cur_bytenr;
2828 struct bio_vec *bvec;
2829 int bio_is_patched;
2830 char **mapped_datav;
2831
2832 dev_bytenr = 512 * bio->bi_iter.bi_sector;
2833 bio_is_patched = 0;
2834 if (dev_state->state->print_mask &
2835 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2836 pr_info("submit_bio(rw=%d,0x%x, bi_vcnt=%u, bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n",
2837 bio_op(bio), bio->bi_opf, bio->bi_vcnt,
2838 (unsigned long long)bio->bi_iter.bi_sector,
2839 dev_bytenr, bio->bi_bdev);
2840
2841 mapped_datav = kmalloc_array(bio->bi_vcnt,
2842 sizeof(*mapped_datav), GFP_NOFS);
2843 if (!mapped_datav)
2844 goto leave;
2845 cur_bytenr = dev_bytenr;
2846
2847 bio_for_each_segment_all(bvec, bio, i) {
2848 BUG_ON(bvec->bv_len != PAGE_SIZE);
2849 mapped_datav[i] = kmap(bvec->bv_page);
2850
2851 if (dev_state->state->print_mask &
2852 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE)
2853 pr_info("#%u: bytenr=%llu, len=%u, offset=%u\n",
2854 i, cur_bytenr, bvec->bv_len, bvec->bv_offset);
2855 cur_bytenr += bvec->bv_len;
2856 }
2857 btrfsic_process_written_block(dev_state, dev_bytenr,
2858 mapped_datav, bio->bi_vcnt,
2859 bio, &bio_is_patched,
2860 NULL, bio->bi_opf);
2861 bio_for_each_segment_all(bvec, bio, i)
2862 kunmap(bvec->bv_page);
2863 kfree(mapped_datav);
2864 } else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) {
2865 if (dev_state->state->print_mask &
2866 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2867 pr_info("submit_bio(rw=%d,0x%x FLUSH, bdev=%p)\n",
2868 bio_op(bio), bio->bi_opf, bio->bi_bdev);
2869 if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
2870 if ((dev_state->state->print_mask &
2871 (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
2872 BTRFSIC_PRINT_MASK_VERBOSE)))
2873 pr_info("btrfsic_submit_bio(%s) with FLUSH but dummy block already in use (ignored)!\n",
2874 dev_state->name);
2875 } else {
2876 struct btrfsic_block *const block =
2877 &dev_state->dummy_block_for_bio_bh_flush;
2878
2879 block->is_iodone = 0;
2880 block->never_written = 0;
2881 block->iodone_w_error = 0;
2882 block->flush_gen = dev_state->last_flush_gen + 1;
2883 block->submit_bio_bh_rw = bio->bi_opf;
2884 block->orig_bio_bh_private = bio->bi_private;
2885 block->orig_bio_bh_end_io.bio = bio->bi_end_io;
2886 block->next_in_same_bio = NULL;
2887 bio->bi_private = block;
2888 bio->bi_end_io = btrfsic_bio_end_io;
2889 }
2890 }
2891leave:
2892 mutex_unlock(&btrfsic_mutex);
2893}
2894
2895void btrfsic_submit_bio(struct bio *bio)
2896{
2897 __btrfsic_submit_bio(bio);
2898 submit_bio(bio);
2899}
2900
2901int btrfsic_submit_bio_wait(struct bio *bio)
2902{
2903 __btrfsic_submit_bio(bio);
2904 return submit_bio_wait(bio);
2905}
2906
2907int btrfsic_mount(struct btrfs_fs_info *fs_info,
2908 struct btrfs_fs_devices *fs_devices,
2909 int including_extent_data, u32 print_mask)
2910{
2911 int ret;
2912 struct btrfsic_state *state;
2913 struct list_head *dev_head = &fs_devices->devices;
2914 struct btrfs_device *device;
2915
2916 if (fs_info->nodesize & ((u64)PAGE_SIZE - 1)) {
2917 pr_info("btrfsic: cannot handle nodesize %d not being a multiple of PAGE_SIZE %ld!\n",
2918 fs_info->nodesize, PAGE_SIZE);
2919 return -1;
2920 }
2921 if (fs_info->sectorsize & ((u64)PAGE_SIZE - 1)) {
2922 pr_info("btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_SIZE %ld!\n",
2923 fs_info->sectorsize, PAGE_SIZE);
2924 return -1;
2925 }
2926 state = kzalloc(sizeof(*state), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
2927 if (!state) {
2928 state = vzalloc(sizeof(*state));
2929 if (!state) {
2930 pr_info("btrfs check-integrity: vzalloc() failed!\n");
2931 return -1;
2932 }
2933 }
2934
2935 if (!btrfsic_is_initialized) {
2936 mutex_init(&btrfsic_mutex);
2937 btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable);
2938 btrfsic_is_initialized = 1;
2939 }
2940 mutex_lock(&btrfsic_mutex);
2941 state->fs_info = fs_info;
2942 state->print_mask = print_mask;
2943 state->include_extent_data = including_extent_data;
2944 state->csum_size = 0;
2945 state->metablock_size = fs_info->nodesize;
2946 state->datablock_size = fs_info->sectorsize;
2947 INIT_LIST_HEAD(&state->all_blocks_list);
2948 btrfsic_block_hashtable_init(&state->block_hashtable);
2949 btrfsic_block_link_hashtable_init(&state->block_link_hashtable);
2950 state->max_superblock_generation = 0;
2951 state->latest_superblock = NULL;
2952
2953 list_for_each_entry(device, dev_head, dev_list) {
2954 struct btrfsic_dev_state *ds;
2955 const char *p;
2956
2957 if (!device->bdev || !device->name)
2958 continue;
2959
2960 ds = btrfsic_dev_state_alloc();
2961 if (NULL == ds) {
2962 pr_info("btrfs check-integrity: kmalloc() failed!\n");
2963 mutex_unlock(&btrfsic_mutex);
2964 return -1;
2965 }
2966 ds->bdev = device->bdev;
2967 ds->state = state;
2968 bdevname(ds->bdev, ds->name);
2969 ds->name[BDEVNAME_SIZE - 1] = '\0';
2970 p = kbasename(ds->name);
2971 strlcpy(ds->name, p, sizeof(ds->name));
2972 btrfsic_dev_state_hashtable_add(ds,
2973 &btrfsic_dev_state_hashtable);
2974 }
2975
2976 ret = btrfsic_process_superblock(state, fs_devices);
2977 if (0 != ret) {
2978 mutex_unlock(&btrfsic_mutex);
2979 btrfsic_unmount(fs_devices);
2980 return ret;
2981 }
2982
2983 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_DATABASE)
2984 btrfsic_dump_database(state);
2985 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_TREE)
2986 btrfsic_dump_tree(state);
2987
2988 mutex_unlock(&btrfsic_mutex);
2989 return 0;
2990}
2991
2992void btrfsic_unmount(struct btrfs_fs_devices *fs_devices)
2993{
2994 struct btrfsic_block *b_all, *tmp_all;
2995 struct btrfsic_state *state;
2996 struct list_head *dev_head = &fs_devices->devices;
2997 struct btrfs_device *device;
2998
2999 if (!btrfsic_is_initialized)
3000 return;
3001
3002 mutex_lock(&btrfsic_mutex);
3003
3004 state = NULL;
3005 list_for_each_entry(device, dev_head, dev_list) {
3006 struct btrfsic_dev_state *ds;
3007
3008 if (!device->bdev || !device->name)
3009 continue;
3010
3011 ds = btrfsic_dev_state_hashtable_lookup(
3012 device->bdev,
3013 &btrfsic_dev_state_hashtable);
3014 if (NULL != ds) {
3015 state = ds->state;
3016 btrfsic_dev_state_hashtable_remove(ds);
3017 btrfsic_dev_state_free(ds);
3018 }
3019 }
3020
3021 if (NULL == state) {
3022 pr_info("btrfsic: error, cannot find state information on umount!\n");
3023 mutex_unlock(&btrfsic_mutex);
3024 return;
3025 }
3026
3027 /*
3028 * Don't care about keeping the lists' state up to date,
3029 * just free all memory that was allocated dynamically.
3030 * Free the blocks and the block_links.
3031 */
3032 list_for_each_entry_safe(b_all, tmp_all, &state->all_blocks_list,
3033 all_blocks_node) {
3034 struct btrfsic_block_link *l, *tmp;
3035
3036 list_for_each_entry_safe(l, tmp, &b_all->ref_to_list,
3037 node_ref_to) {
3038 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
3039 btrfsic_print_rem_link(state, l);
3040
3041 l->ref_cnt--;
3042 if (0 == l->ref_cnt)
3043 btrfsic_block_link_free(l);
3044 }
3045
3046 if (b_all->is_iodone || b_all->never_written)
3047 btrfsic_block_free(b_all);
3048 else
3049 pr_info("btrfs: attempt to free %c-block @%llu (%s/%llu/%d) on umount which is not yet iodone!\n",
3050 btrfsic_get_block_type(state, b_all),
3051 b_all->logical_bytenr, b_all->dev_state->name,
3052 b_all->dev_bytenr, b_all->mirror_num);
3053 }
3054
3055 mutex_unlock(&btrfsic_mutex);
3056
3057 kvfree(state);
3058}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) STRATO AG 2011. All rights reserved.
4 */
5
6/*
7 * This module can be used to catch cases when the btrfs kernel
8 * code executes write requests to the disk that bring the file
9 * system in an inconsistent state. In such a state, a power-loss
10 * or kernel panic event would cause that the data on disk is
11 * lost or at least damaged.
12 *
13 * Code is added that examines all block write requests during
14 * runtime (including writes of the super block). Three rules
15 * are verified and an error is printed on violation of the
16 * rules:
17 * 1. It is not allowed to write a disk block which is
18 * currently referenced by the super block (either directly
19 * or indirectly).
20 * 2. When a super block is written, it is verified that all
21 * referenced (directly or indirectly) blocks fulfill the
22 * following requirements:
23 * 2a. All referenced blocks have either been present when
24 * the file system was mounted, (i.e., they have been
25 * referenced by the super block) or they have been
26 * written since then and the write completion callback
27 * was called and no write error was indicated and a
28 * FLUSH request to the device where these blocks are
29 * located was received and completed.
30 * 2b. All referenced blocks need to have a generation
31 * number which is equal to the parent's number.
32 *
33 * One issue that was found using this module was that the log
34 * tree on disk became temporarily corrupted because disk blocks
35 * that had been in use for the log tree had been freed and
36 * reused too early, while being referenced by the written super
37 * block.
38 *
39 * The search term in the kernel log that can be used to filter
40 * on the existence of detected integrity issues is
41 * "btrfs: attempt".
42 *
43 * The integrity check is enabled via mount options. These
44 * mount options are only supported if the integrity check
45 * tool is compiled by defining BTRFS_FS_CHECK_INTEGRITY.
46 *
47 * Example #1, apply integrity checks to all metadata:
48 * mount /dev/sdb1 /mnt -o check_int
49 *
50 * Example #2, apply integrity checks to all metadata and
51 * to data extents:
52 * mount /dev/sdb1 /mnt -o check_int_data
53 *
54 * Example #3, apply integrity checks to all metadata and dump
55 * the tree that the super block references to kernel messages
56 * each time after a super block was written:
57 * mount /dev/sdb1 /mnt -o check_int,check_int_print_mask=263
58 *
59 * If the integrity check tool is included and activated in
60 * the mount options, plenty of kernel memory is used, and
61 * plenty of additional CPU cycles are spent. Enabling this
62 * functionality is not intended for normal use. In most
63 * cases, unless you are a btrfs developer who needs to verify
64 * the integrity of (super)-block write requests, do not
65 * enable the config option BTRFS_FS_CHECK_INTEGRITY to
66 * include and compile the integrity check tool.
67 *
68 * Expect millions of lines of information in the kernel log with an
69 * enabled check_int_print_mask. Therefore set LOG_BUF_SHIFT in the
70 * kernel config to at least 26 (which is 64MB). Usually the value is
71 * limited to 21 (which is 2MB) in init/Kconfig. The file needs to be
72 * changed like this before LOG_BUF_SHIFT can be set to a high value:
73 * config LOG_BUF_SHIFT
74 * int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
75 * range 12 30
76 */
77
78#include <linux/sched.h>
79#include <linux/slab.h>
80#include <linux/mutex.h>
81#include <linux/genhd.h>
82#include <linux/blkdev.h>
83#include <linux/mm.h>
84#include <linux/string.h>
85#include <crypto/hash.h>
86#include "ctree.h"
87#include "disk-io.h"
88#include "transaction.h"
89#include "extent_io.h"
90#include "volumes.h"
91#include "print-tree.h"
92#include "locking.h"
93#include "check-integrity.h"
94#include "rcu-string.h"
95#include "compression.h"
96
97#define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000
98#define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000
99#define BTRFSIC_DEV2STATE_HASHTABLE_SIZE 0x100
100#define BTRFSIC_BLOCK_MAGIC_NUMBER 0x14491051
101#define BTRFSIC_BLOCK_LINK_MAGIC_NUMBER 0x11070807
102#define BTRFSIC_DEV2STATE_MAGIC_NUMBER 0x20111530
103#define BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER 20111300
104#define BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL (200 - 6) /* in characters,
105 * excluding " [...]" */
106#define BTRFSIC_GENERATION_UNKNOWN ((u64)-1)
107
108/*
109 * The definition of the bitmask fields for the print_mask.
110 * They are specified with the mount option check_integrity_print_mask.
111 */
112#define BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE 0x00000001
113#define BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION 0x00000002
114#define BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE 0x00000004
115#define BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE 0x00000008
116#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH 0x00000010
117#define BTRFSIC_PRINT_MASK_END_IO_BIO_BH 0x00000020
118#define BTRFSIC_PRINT_MASK_VERBOSE 0x00000040
119#define BTRFSIC_PRINT_MASK_VERY_VERBOSE 0x00000080
120#define BTRFSIC_PRINT_MASK_INITIAL_TREE 0x00000100
121#define BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES 0x00000200
122#define BTRFSIC_PRINT_MASK_INITIAL_DATABASE 0x00000400
123#define BTRFSIC_PRINT_MASK_NUM_COPIES 0x00000800
124#define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS 0x00001000
125#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE 0x00002000
126
127struct btrfsic_dev_state;
128struct btrfsic_state;
129
130struct btrfsic_block {
131 u32 magic_num; /* only used for debug purposes */
132 unsigned int is_metadata:1; /* if it is meta-data, not data-data */
133 unsigned int is_superblock:1; /* if it is one of the superblocks */
134 unsigned int is_iodone:1; /* if is done by lower subsystem */
135 unsigned int iodone_w_error:1; /* error was indicated to endio */
136 unsigned int never_written:1; /* block was added because it was
137 * referenced, not because it was
138 * written */
139 unsigned int mirror_num; /* large enough to hold
140 * BTRFS_SUPER_MIRROR_MAX */
141 struct btrfsic_dev_state *dev_state;
142 u64 dev_bytenr; /* key, physical byte num on disk */
143 u64 logical_bytenr; /* logical byte num on disk */
144 u64 generation;
145 struct btrfs_disk_key disk_key; /* extra info to print in case of
146 * issues, will not always be correct */
147 struct list_head collision_resolving_node; /* list node */
148 struct list_head all_blocks_node; /* list node */
149
150 /* the following two lists contain block_link items */
151 struct list_head ref_to_list; /* list */
152 struct list_head ref_from_list; /* list */
153 struct btrfsic_block *next_in_same_bio;
154 void *orig_bio_private;
155 bio_end_io_t *orig_bio_end_io;
156 int submit_bio_bh_rw;
157 u64 flush_gen; /* only valid if !never_written */
158};
159
160/*
161 * Elements of this type are allocated dynamically and required because
162 * each block object can refer to and can be ref from multiple blocks.
163 * The key to lookup them in the hashtable is the dev_bytenr of
164 * the block ref to plus the one from the block referred from.
165 * The fact that they are searchable via a hashtable and that a
166 * ref_cnt is maintained is not required for the btrfs integrity
167 * check algorithm itself, it is only used to make the output more
168 * beautiful in case that an error is detected (an error is defined
169 * as a write operation to a block while that block is still referenced).
170 */
171struct btrfsic_block_link {
172 u32 magic_num; /* only used for debug purposes */
173 u32 ref_cnt;
174 struct list_head node_ref_to; /* list node */
175 struct list_head node_ref_from; /* list node */
176 struct list_head collision_resolving_node; /* list node */
177 struct btrfsic_block *block_ref_to;
178 struct btrfsic_block *block_ref_from;
179 u64 parent_generation;
180};
181
182struct btrfsic_dev_state {
183 u32 magic_num; /* only used for debug purposes */
184 struct block_device *bdev;
185 struct btrfsic_state *state;
186 struct list_head collision_resolving_node; /* list node */
187 struct btrfsic_block dummy_block_for_bio_bh_flush;
188 u64 last_flush_gen;
189 char name[BDEVNAME_SIZE];
190};
191
192struct btrfsic_block_hashtable {
193 struct list_head table[BTRFSIC_BLOCK_HASHTABLE_SIZE];
194};
195
196struct btrfsic_block_link_hashtable {
197 struct list_head table[BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE];
198};
199
200struct btrfsic_dev_state_hashtable {
201 struct list_head table[BTRFSIC_DEV2STATE_HASHTABLE_SIZE];
202};
203
204struct btrfsic_block_data_ctx {
205 u64 start; /* virtual bytenr */
206 u64 dev_bytenr; /* physical bytenr on device */
207 u32 len;
208 struct btrfsic_dev_state *dev;
209 char **datav;
210 struct page **pagev;
211 void *mem_to_free;
212};
213
214/* This structure is used to implement recursion without occupying
215 * any stack space, refer to btrfsic_process_metablock() */
216struct btrfsic_stack_frame {
217 u32 magic;
218 u32 nr;
219 int error;
220 int i;
221 int limit_nesting;
222 int num_copies;
223 int mirror_num;
224 struct btrfsic_block *block;
225 struct btrfsic_block_data_ctx *block_ctx;
226 struct btrfsic_block *next_block;
227 struct btrfsic_block_data_ctx next_block_ctx;
228 struct btrfs_header *hdr;
229 struct btrfsic_stack_frame *prev;
230};
231
232/* Some state per mounted filesystem */
233struct btrfsic_state {
234 u32 print_mask;
235 int include_extent_data;
236 struct list_head all_blocks_list;
237 struct btrfsic_block_hashtable block_hashtable;
238 struct btrfsic_block_link_hashtable block_link_hashtable;
239 struct btrfs_fs_info *fs_info;
240 u64 max_superblock_generation;
241 struct btrfsic_block *latest_superblock;
242 u32 metablock_size;
243 u32 datablock_size;
244};
245
246static void btrfsic_block_init(struct btrfsic_block *b);
247static struct btrfsic_block *btrfsic_block_alloc(void);
248static void btrfsic_block_free(struct btrfsic_block *b);
249static void btrfsic_block_link_init(struct btrfsic_block_link *n);
250static struct btrfsic_block_link *btrfsic_block_link_alloc(void);
251static void btrfsic_block_link_free(struct btrfsic_block_link *n);
252static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds);
253static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void);
254static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds);
255static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h);
256static void btrfsic_block_hashtable_add(struct btrfsic_block *b,
257 struct btrfsic_block_hashtable *h);
258static void btrfsic_block_hashtable_remove(struct btrfsic_block *b);
259static struct btrfsic_block *btrfsic_block_hashtable_lookup(
260 struct block_device *bdev,
261 u64 dev_bytenr,
262 struct btrfsic_block_hashtable *h);
263static void btrfsic_block_link_hashtable_init(
264 struct btrfsic_block_link_hashtable *h);
265static void btrfsic_block_link_hashtable_add(
266 struct btrfsic_block_link *l,
267 struct btrfsic_block_link_hashtable *h);
268static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l);
269static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup(
270 struct block_device *bdev_ref_to,
271 u64 dev_bytenr_ref_to,
272 struct block_device *bdev_ref_from,
273 u64 dev_bytenr_ref_from,
274 struct btrfsic_block_link_hashtable *h);
275static void btrfsic_dev_state_hashtable_init(
276 struct btrfsic_dev_state_hashtable *h);
277static void btrfsic_dev_state_hashtable_add(
278 struct btrfsic_dev_state *ds,
279 struct btrfsic_dev_state_hashtable *h);
280static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds);
281static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(dev_t dev,
282 struct btrfsic_dev_state_hashtable *h);
283static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void);
284static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf);
285static int btrfsic_process_superblock(struct btrfsic_state *state,
286 struct btrfs_fs_devices *fs_devices);
287static int btrfsic_process_metablock(struct btrfsic_state *state,
288 struct btrfsic_block *block,
289 struct btrfsic_block_data_ctx *block_ctx,
290 int limit_nesting, int force_iodone_flag);
291static void btrfsic_read_from_block_data(
292 struct btrfsic_block_data_ctx *block_ctx,
293 void *dst, u32 offset, size_t len);
294static int btrfsic_create_link_to_next_block(
295 struct btrfsic_state *state,
296 struct btrfsic_block *block,
297 struct btrfsic_block_data_ctx
298 *block_ctx, u64 next_bytenr,
299 int limit_nesting,
300 struct btrfsic_block_data_ctx *next_block_ctx,
301 struct btrfsic_block **next_blockp,
302 int force_iodone_flag,
303 int *num_copiesp, int *mirror_nump,
304 struct btrfs_disk_key *disk_key,
305 u64 parent_generation);
306static int btrfsic_handle_extent_data(struct btrfsic_state *state,
307 struct btrfsic_block *block,
308 struct btrfsic_block_data_ctx *block_ctx,
309 u32 item_offset, int force_iodone_flag);
310static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
311 struct btrfsic_block_data_ctx *block_ctx_out,
312 int mirror_num);
313static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx);
314static int btrfsic_read_block(struct btrfsic_state *state,
315 struct btrfsic_block_data_ctx *block_ctx);
316static void btrfsic_dump_database(struct btrfsic_state *state);
317static int btrfsic_test_for_metadata(struct btrfsic_state *state,
318 char **datav, unsigned int num_pages);
319static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
320 u64 dev_bytenr, char **mapped_datav,
321 unsigned int num_pages,
322 struct bio *bio, int *bio_is_patched,
323 int submit_bio_bh_rw);
324static int btrfsic_process_written_superblock(
325 struct btrfsic_state *state,
326 struct btrfsic_block *const block,
327 struct btrfs_super_block *const super_hdr);
328static void btrfsic_bio_end_io(struct bio *bp);
329static int btrfsic_is_block_ref_by_superblock(const struct btrfsic_state *state,
330 const struct btrfsic_block *block,
331 int recursion_level);
332static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state,
333 struct btrfsic_block *const block,
334 int recursion_level);
335static void btrfsic_print_add_link(const struct btrfsic_state *state,
336 const struct btrfsic_block_link *l);
337static void btrfsic_print_rem_link(const struct btrfsic_state *state,
338 const struct btrfsic_block_link *l);
339static char btrfsic_get_block_type(const struct btrfsic_state *state,
340 const struct btrfsic_block *block);
341static void btrfsic_dump_tree(const struct btrfsic_state *state);
342static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
343 const struct btrfsic_block *block,
344 int indent_level);
345static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
346 struct btrfsic_state *state,
347 struct btrfsic_block_data_ctx *next_block_ctx,
348 struct btrfsic_block *next_block,
349 struct btrfsic_block *from_block,
350 u64 parent_generation);
351static struct btrfsic_block *btrfsic_block_lookup_or_add(
352 struct btrfsic_state *state,
353 struct btrfsic_block_data_ctx *block_ctx,
354 const char *additional_string,
355 int is_metadata,
356 int is_iodone,
357 int never_written,
358 int mirror_num,
359 int *was_created);
360static int btrfsic_process_superblock_dev_mirror(
361 struct btrfsic_state *state,
362 struct btrfsic_dev_state *dev_state,
363 struct btrfs_device *device,
364 int superblock_mirror_num,
365 struct btrfsic_dev_state **selected_dev_state,
366 struct btrfs_super_block *selected_super);
367static struct btrfsic_dev_state *btrfsic_dev_state_lookup(dev_t dev);
368static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
369 u64 bytenr,
370 struct btrfsic_dev_state *dev_state,
371 u64 dev_bytenr);
372
373static struct mutex btrfsic_mutex;
374static int btrfsic_is_initialized;
375static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable;
376
377
378static void btrfsic_block_init(struct btrfsic_block *b)
379{
380 b->magic_num = BTRFSIC_BLOCK_MAGIC_NUMBER;
381 b->dev_state = NULL;
382 b->dev_bytenr = 0;
383 b->logical_bytenr = 0;
384 b->generation = BTRFSIC_GENERATION_UNKNOWN;
385 b->disk_key.objectid = 0;
386 b->disk_key.type = 0;
387 b->disk_key.offset = 0;
388 b->is_metadata = 0;
389 b->is_superblock = 0;
390 b->is_iodone = 0;
391 b->iodone_w_error = 0;
392 b->never_written = 0;
393 b->mirror_num = 0;
394 b->next_in_same_bio = NULL;
395 b->orig_bio_private = NULL;
396 b->orig_bio_end_io = NULL;
397 INIT_LIST_HEAD(&b->collision_resolving_node);
398 INIT_LIST_HEAD(&b->all_blocks_node);
399 INIT_LIST_HEAD(&b->ref_to_list);
400 INIT_LIST_HEAD(&b->ref_from_list);
401 b->submit_bio_bh_rw = 0;
402 b->flush_gen = 0;
403}
404
405static struct btrfsic_block *btrfsic_block_alloc(void)
406{
407 struct btrfsic_block *b;
408
409 b = kzalloc(sizeof(*b), GFP_NOFS);
410 if (NULL != b)
411 btrfsic_block_init(b);
412
413 return b;
414}
415
416static void btrfsic_block_free(struct btrfsic_block *b)
417{
418 BUG_ON(!(NULL == b || BTRFSIC_BLOCK_MAGIC_NUMBER == b->magic_num));
419 kfree(b);
420}
421
422static void btrfsic_block_link_init(struct btrfsic_block_link *l)
423{
424 l->magic_num = BTRFSIC_BLOCK_LINK_MAGIC_NUMBER;
425 l->ref_cnt = 1;
426 INIT_LIST_HEAD(&l->node_ref_to);
427 INIT_LIST_HEAD(&l->node_ref_from);
428 INIT_LIST_HEAD(&l->collision_resolving_node);
429 l->block_ref_to = NULL;
430 l->block_ref_from = NULL;
431}
432
433static struct btrfsic_block_link *btrfsic_block_link_alloc(void)
434{
435 struct btrfsic_block_link *l;
436
437 l = kzalloc(sizeof(*l), GFP_NOFS);
438 if (NULL != l)
439 btrfsic_block_link_init(l);
440
441 return l;
442}
443
444static void btrfsic_block_link_free(struct btrfsic_block_link *l)
445{
446 BUG_ON(!(NULL == l || BTRFSIC_BLOCK_LINK_MAGIC_NUMBER == l->magic_num));
447 kfree(l);
448}
449
450static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds)
451{
452 ds->magic_num = BTRFSIC_DEV2STATE_MAGIC_NUMBER;
453 ds->bdev = NULL;
454 ds->state = NULL;
455 ds->name[0] = '\0';
456 INIT_LIST_HEAD(&ds->collision_resolving_node);
457 ds->last_flush_gen = 0;
458 btrfsic_block_init(&ds->dummy_block_for_bio_bh_flush);
459 ds->dummy_block_for_bio_bh_flush.is_iodone = 1;
460 ds->dummy_block_for_bio_bh_flush.dev_state = ds;
461}
462
463static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void)
464{
465 struct btrfsic_dev_state *ds;
466
467 ds = kzalloc(sizeof(*ds), GFP_NOFS);
468 if (NULL != ds)
469 btrfsic_dev_state_init(ds);
470
471 return ds;
472}
473
474static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds)
475{
476 BUG_ON(!(NULL == ds ||
477 BTRFSIC_DEV2STATE_MAGIC_NUMBER == ds->magic_num));
478 kfree(ds);
479}
480
481static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h)
482{
483 int i;
484
485 for (i = 0; i < BTRFSIC_BLOCK_HASHTABLE_SIZE; i++)
486 INIT_LIST_HEAD(h->table + i);
487}
488
489static void btrfsic_block_hashtable_add(struct btrfsic_block *b,
490 struct btrfsic_block_hashtable *h)
491{
492 const unsigned int hashval =
493 (((unsigned int)(b->dev_bytenr >> 16)) ^
494 ((unsigned int)((uintptr_t)b->dev_state->bdev))) &
495 (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
496
497 list_add(&b->collision_resolving_node, h->table + hashval);
498}
499
500static void btrfsic_block_hashtable_remove(struct btrfsic_block *b)
501{
502 list_del(&b->collision_resolving_node);
503}
504
505static struct btrfsic_block *btrfsic_block_hashtable_lookup(
506 struct block_device *bdev,
507 u64 dev_bytenr,
508 struct btrfsic_block_hashtable *h)
509{
510 const unsigned int hashval =
511 (((unsigned int)(dev_bytenr >> 16)) ^
512 ((unsigned int)((uintptr_t)bdev))) &
513 (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
514 struct btrfsic_block *b;
515
516 list_for_each_entry(b, h->table + hashval, collision_resolving_node) {
517 if (b->dev_state->bdev == bdev && b->dev_bytenr == dev_bytenr)
518 return b;
519 }
520
521 return NULL;
522}
523
524static void btrfsic_block_link_hashtable_init(
525 struct btrfsic_block_link_hashtable *h)
526{
527 int i;
528
529 for (i = 0; i < BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE; i++)
530 INIT_LIST_HEAD(h->table + i);
531}
532
533static void btrfsic_block_link_hashtable_add(
534 struct btrfsic_block_link *l,
535 struct btrfsic_block_link_hashtable *h)
536{
537 const unsigned int hashval =
538 (((unsigned int)(l->block_ref_to->dev_bytenr >> 16)) ^
539 ((unsigned int)(l->block_ref_from->dev_bytenr >> 16)) ^
540 ((unsigned int)((uintptr_t)l->block_ref_to->dev_state->bdev)) ^
541 ((unsigned int)((uintptr_t)l->block_ref_from->dev_state->bdev)))
542 & (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
543
544 BUG_ON(NULL == l->block_ref_to);
545 BUG_ON(NULL == l->block_ref_from);
546 list_add(&l->collision_resolving_node, h->table + hashval);
547}
548
549static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l)
550{
551 list_del(&l->collision_resolving_node);
552}
553
554static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup(
555 struct block_device *bdev_ref_to,
556 u64 dev_bytenr_ref_to,
557 struct block_device *bdev_ref_from,
558 u64 dev_bytenr_ref_from,
559 struct btrfsic_block_link_hashtable *h)
560{
561 const unsigned int hashval =
562 (((unsigned int)(dev_bytenr_ref_to >> 16)) ^
563 ((unsigned int)(dev_bytenr_ref_from >> 16)) ^
564 ((unsigned int)((uintptr_t)bdev_ref_to)) ^
565 ((unsigned int)((uintptr_t)bdev_ref_from))) &
566 (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
567 struct btrfsic_block_link *l;
568
569 list_for_each_entry(l, h->table + hashval, collision_resolving_node) {
570 BUG_ON(NULL == l->block_ref_to);
571 BUG_ON(NULL == l->block_ref_from);
572 if (l->block_ref_to->dev_state->bdev == bdev_ref_to &&
573 l->block_ref_to->dev_bytenr == dev_bytenr_ref_to &&
574 l->block_ref_from->dev_state->bdev == bdev_ref_from &&
575 l->block_ref_from->dev_bytenr == dev_bytenr_ref_from)
576 return l;
577 }
578
579 return NULL;
580}
581
582static void btrfsic_dev_state_hashtable_init(
583 struct btrfsic_dev_state_hashtable *h)
584{
585 int i;
586
587 for (i = 0; i < BTRFSIC_DEV2STATE_HASHTABLE_SIZE; i++)
588 INIT_LIST_HEAD(h->table + i);
589}
590
591static void btrfsic_dev_state_hashtable_add(
592 struct btrfsic_dev_state *ds,
593 struct btrfsic_dev_state_hashtable *h)
594{
595 const unsigned int hashval =
596 (((unsigned int)((uintptr_t)ds->bdev->bd_dev)) &
597 (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1));
598
599 list_add(&ds->collision_resolving_node, h->table + hashval);
600}
601
602static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds)
603{
604 list_del(&ds->collision_resolving_node);
605}
606
607static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(dev_t dev,
608 struct btrfsic_dev_state_hashtable *h)
609{
610 const unsigned int hashval =
611 dev & (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1);
612 struct btrfsic_dev_state *ds;
613
614 list_for_each_entry(ds, h->table + hashval, collision_resolving_node) {
615 if (ds->bdev->bd_dev == dev)
616 return ds;
617 }
618
619 return NULL;
620}
621
622static int btrfsic_process_superblock(struct btrfsic_state *state,
623 struct btrfs_fs_devices *fs_devices)
624{
625 struct btrfs_super_block *selected_super;
626 struct list_head *dev_head = &fs_devices->devices;
627 struct btrfs_device *device;
628 struct btrfsic_dev_state *selected_dev_state = NULL;
629 int ret = 0;
630 int pass;
631
632 selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS);
633 if (!selected_super)
634 return -ENOMEM;
635
636 list_for_each_entry(device, dev_head, dev_list) {
637 int i;
638 struct btrfsic_dev_state *dev_state;
639
640 if (!device->bdev || !device->name)
641 continue;
642
643 dev_state = btrfsic_dev_state_lookup(device->bdev->bd_dev);
644 BUG_ON(NULL == dev_state);
645 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
646 ret = btrfsic_process_superblock_dev_mirror(
647 state, dev_state, device, i,
648 &selected_dev_state, selected_super);
649 if (0 != ret && 0 == i) {
650 kfree(selected_super);
651 return ret;
652 }
653 }
654 }
655
656 if (NULL == state->latest_superblock) {
657 pr_info("btrfsic: no superblock found!\n");
658 kfree(selected_super);
659 return -1;
660 }
661
662 for (pass = 0; pass < 3; pass++) {
663 int num_copies;
664 int mirror_num;
665 u64 next_bytenr;
666
667 switch (pass) {
668 case 0:
669 next_bytenr = btrfs_super_root(selected_super);
670 if (state->print_mask &
671 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
672 pr_info("root@%llu\n", next_bytenr);
673 break;
674 case 1:
675 next_bytenr = btrfs_super_chunk_root(selected_super);
676 if (state->print_mask &
677 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
678 pr_info("chunk@%llu\n", next_bytenr);
679 break;
680 case 2:
681 next_bytenr = btrfs_super_log_root(selected_super);
682 if (0 == next_bytenr)
683 continue;
684 if (state->print_mask &
685 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
686 pr_info("log@%llu\n", next_bytenr);
687 break;
688 }
689
690 num_copies = btrfs_num_copies(state->fs_info, next_bytenr,
691 state->metablock_size);
692 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
693 pr_info("num_copies(log_bytenr=%llu) = %d\n",
694 next_bytenr, num_copies);
695
696 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
697 struct btrfsic_block *next_block;
698 struct btrfsic_block_data_ctx tmp_next_block_ctx;
699 struct btrfsic_block_link *l;
700
701 ret = btrfsic_map_block(state, next_bytenr,
702 state->metablock_size,
703 &tmp_next_block_ctx,
704 mirror_num);
705 if (ret) {
706 pr_info("btrfsic: btrfsic_map_block(root @%llu, mirror %d) failed!\n",
707 next_bytenr, mirror_num);
708 kfree(selected_super);
709 return -1;
710 }
711
712 next_block = btrfsic_block_hashtable_lookup(
713 tmp_next_block_ctx.dev->bdev,
714 tmp_next_block_ctx.dev_bytenr,
715 &state->block_hashtable);
716 BUG_ON(NULL == next_block);
717
718 l = btrfsic_block_link_hashtable_lookup(
719 tmp_next_block_ctx.dev->bdev,
720 tmp_next_block_ctx.dev_bytenr,
721 state->latest_superblock->dev_state->
722 bdev,
723 state->latest_superblock->dev_bytenr,
724 &state->block_link_hashtable);
725 BUG_ON(NULL == l);
726
727 ret = btrfsic_read_block(state, &tmp_next_block_ctx);
728 if (ret < (int)PAGE_SIZE) {
729 pr_info("btrfsic: read @logical %llu failed!\n",
730 tmp_next_block_ctx.start);
731 btrfsic_release_block_ctx(&tmp_next_block_ctx);
732 kfree(selected_super);
733 return -1;
734 }
735
736 ret = btrfsic_process_metablock(state,
737 next_block,
738 &tmp_next_block_ctx,
739 BTRFS_MAX_LEVEL + 3, 1);
740 btrfsic_release_block_ctx(&tmp_next_block_ctx);
741 }
742 }
743
744 kfree(selected_super);
745 return ret;
746}
747
748static int btrfsic_process_superblock_dev_mirror(
749 struct btrfsic_state *state,
750 struct btrfsic_dev_state *dev_state,
751 struct btrfs_device *device,
752 int superblock_mirror_num,
753 struct btrfsic_dev_state **selected_dev_state,
754 struct btrfs_super_block *selected_super)
755{
756 struct btrfs_fs_info *fs_info = state->fs_info;
757 struct btrfs_super_block *super_tmp;
758 u64 dev_bytenr;
759 struct btrfsic_block *superblock_tmp;
760 int pass;
761 struct block_device *const superblock_bdev = device->bdev;
762 struct page *page;
763 struct address_space *mapping = superblock_bdev->bd_inode->i_mapping;
764 int ret = 0;
765
766 /* super block bytenr is always the unmapped device bytenr */
767 dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
768 if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->commit_total_bytes)
769 return -1;
770
771 page = read_cache_page_gfp(mapping, dev_bytenr >> PAGE_SHIFT, GFP_NOFS);
772 if (IS_ERR(page))
773 return -1;
774
775 super_tmp = page_address(page);
776
777 if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
778 btrfs_super_magic(super_tmp) != BTRFS_MAGIC ||
779 memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) ||
780 btrfs_super_nodesize(super_tmp) != state->metablock_size ||
781 btrfs_super_sectorsize(super_tmp) != state->datablock_size) {
782 ret = 0;
783 goto out;
784 }
785
786 superblock_tmp =
787 btrfsic_block_hashtable_lookup(superblock_bdev,
788 dev_bytenr,
789 &state->block_hashtable);
790 if (NULL == superblock_tmp) {
791 superblock_tmp = btrfsic_block_alloc();
792 if (NULL == superblock_tmp) {
793 ret = -1;
794 goto out;
795 }
796 /* for superblock, only the dev_bytenr makes sense */
797 superblock_tmp->dev_bytenr = dev_bytenr;
798 superblock_tmp->dev_state = dev_state;
799 superblock_tmp->logical_bytenr = dev_bytenr;
800 superblock_tmp->generation = btrfs_super_generation(super_tmp);
801 superblock_tmp->is_metadata = 1;
802 superblock_tmp->is_superblock = 1;
803 superblock_tmp->is_iodone = 1;
804 superblock_tmp->never_written = 0;
805 superblock_tmp->mirror_num = 1 + superblock_mirror_num;
806 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
807 btrfs_info_in_rcu(fs_info,
808 "new initial S-block (bdev %p, %s) @%llu (%s/%llu/%d)",
809 superblock_bdev,
810 rcu_str_deref(device->name), dev_bytenr,
811 dev_state->name, dev_bytenr,
812 superblock_mirror_num);
813 list_add(&superblock_tmp->all_blocks_node,
814 &state->all_blocks_list);
815 btrfsic_block_hashtable_add(superblock_tmp,
816 &state->block_hashtable);
817 }
818
819 /* select the one with the highest generation field */
820 if (btrfs_super_generation(super_tmp) >
821 state->max_superblock_generation ||
822 0 == state->max_superblock_generation) {
823 memcpy(selected_super, super_tmp, sizeof(*selected_super));
824 *selected_dev_state = dev_state;
825 state->max_superblock_generation =
826 btrfs_super_generation(super_tmp);
827 state->latest_superblock = superblock_tmp;
828 }
829
830 for (pass = 0; pass < 3; pass++) {
831 u64 next_bytenr;
832 int num_copies;
833 int mirror_num;
834 const char *additional_string = NULL;
835 struct btrfs_disk_key tmp_disk_key;
836
837 tmp_disk_key.type = BTRFS_ROOT_ITEM_KEY;
838 tmp_disk_key.offset = 0;
839 switch (pass) {
840 case 0:
841 btrfs_set_disk_key_objectid(&tmp_disk_key,
842 BTRFS_ROOT_TREE_OBJECTID);
843 additional_string = "initial root ";
844 next_bytenr = btrfs_super_root(super_tmp);
845 break;
846 case 1:
847 btrfs_set_disk_key_objectid(&tmp_disk_key,
848 BTRFS_CHUNK_TREE_OBJECTID);
849 additional_string = "initial chunk ";
850 next_bytenr = btrfs_super_chunk_root(super_tmp);
851 break;
852 case 2:
853 btrfs_set_disk_key_objectid(&tmp_disk_key,
854 BTRFS_TREE_LOG_OBJECTID);
855 additional_string = "initial log ";
856 next_bytenr = btrfs_super_log_root(super_tmp);
857 if (0 == next_bytenr)
858 continue;
859 break;
860 }
861
862 num_copies = btrfs_num_copies(fs_info, next_bytenr,
863 state->metablock_size);
864 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
865 pr_info("num_copies(log_bytenr=%llu) = %d\n",
866 next_bytenr, num_copies);
867 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
868 struct btrfsic_block *next_block;
869 struct btrfsic_block_data_ctx tmp_next_block_ctx;
870 struct btrfsic_block_link *l;
871
872 if (btrfsic_map_block(state, next_bytenr,
873 state->metablock_size,
874 &tmp_next_block_ctx,
875 mirror_num)) {
876 pr_info("btrfsic: btrfsic_map_block(bytenr @%llu, mirror %d) failed!\n",
877 next_bytenr, mirror_num);
878 ret = -1;
879 goto out;
880 }
881
882 next_block = btrfsic_block_lookup_or_add(
883 state, &tmp_next_block_ctx,
884 additional_string, 1, 1, 0,
885 mirror_num, NULL);
886 if (NULL == next_block) {
887 btrfsic_release_block_ctx(&tmp_next_block_ctx);
888 ret = -1;
889 goto out;
890 }
891
892 next_block->disk_key = tmp_disk_key;
893 next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
894 l = btrfsic_block_link_lookup_or_add(
895 state, &tmp_next_block_ctx,
896 next_block, superblock_tmp,
897 BTRFSIC_GENERATION_UNKNOWN);
898 btrfsic_release_block_ctx(&tmp_next_block_ctx);
899 if (NULL == l) {
900 ret = -1;
901 goto out;
902 }
903 }
904 }
905 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES)
906 btrfsic_dump_tree_sub(state, superblock_tmp, 0);
907
908out:
909 put_page(page);
910 return ret;
911}
912
913static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void)
914{
915 struct btrfsic_stack_frame *sf;
916
917 sf = kzalloc(sizeof(*sf), GFP_NOFS);
918 if (sf)
919 sf->magic = BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER;
920 return sf;
921}
922
923static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf)
924{
925 BUG_ON(!(NULL == sf ||
926 BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER == sf->magic));
927 kfree(sf);
928}
929
930static noinline_for_stack int btrfsic_process_metablock(
931 struct btrfsic_state *state,
932 struct btrfsic_block *const first_block,
933 struct btrfsic_block_data_ctx *const first_block_ctx,
934 int first_limit_nesting, int force_iodone_flag)
935{
936 struct btrfsic_stack_frame initial_stack_frame = { 0 };
937 struct btrfsic_stack_frame *sf;
938 struct btrfsic_stack_frame *next_stack;
939 struct btrfs_header *const first_hdr =
940 (struct btrfs_header *)first_block_ctx->datav[0];
941
942 BUG_ON(!first_hdr);
943 sf = &initial_stack_frame;
944 sf->error = 0;
945 sf->i = -1;
946 sf->limit_nesting = first_limit_nesting;
947 sf->block = first_block;
948 sf->block_ctx = first_block_ctx;
949 sf->next_block = NULL;
950 sf->hdr = first_hdr;
951 sf->prev = NULL;
952
953continue_with_new_stack_frame:
954 sf->block->generation = btrfs_stack_header_generation(sf->hdr);
955 if (0 == sf->hdr->level) {
956 struct btrfs_leaf *const leafhdr =
957 (struct btrfs_leaf *)sf->hdr;
958
959 if (-1 == sf->i) {
960 sf->nr = btrfs_stack_header_nritems(&leafhdr->header);
961
962 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
963 pr_info("leaf %llu items %d generation %llu owner %llu\n",
964 sf->block_ctx->start, sf->nr,
965 btrfs_stack_header_generation(
966 &leafhdr->header),
967 btrfs_stack_header_owner(
968 &leafhdr->header));
969 }
970
971continue_with_current_leaf_stack_frame:
972 if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
973 sf->i++;
974 sf->num_copies = 0;
975 }
976
977 if (sf->i < sf->nr) {
978 struct btrfs_item disk_item;
979 u32 disk_item_offset =
980 (uintptr_t)(leafhdr->items + sf->i) -
981 (uintptr_t)leafhdr;
982 struct btrfs_disk_key *disk_key;
983 u8 type;
984 u32 item_offset;
985 u32 item_size;
986
987 if (disk_item_offset + sizeof(struct btrfs_item) >
988 sf->block_ctx->len) {
989leaf_item_out_of_bounce_error:
990 pr_info("btrfsic: leaf item out of bounce at logical %llu, dev %s\n",
991 sf->block_ctx->start,
992 sf->block_ctx->dev->name);
993 goto one_stack_frame_backwards;
994 }
995 btrfsic_read_from_block_data(sf->block_ctx,
996 &disk_item,
997 disk_item_offset,
998 sizeof(struct btrfs_item));
999 item_offset = btrfs_stack_item_offset(&disk_item);
1000 item_size = btrfs_stack_item_size(&disk_item);
1001 disk_key = &disk_item.key;
1002 type = btrfs_disk_key_type(disk_key);
1003
1004 if (BTRFS_ROOT_ITEM_KEY == type) {
1005 struct btrfs_root_item root_item;
1006 u32 root_item_offset;
1007 u64 next_bytenr;
1008
1009 root_item_offset = item_offset +
1010 offsetof(struct btrfs_leaf, items);
1011 if (root_item_offset + item_size >
1012 sf->block_ctx->len)
1013 goto leaf_item_out_of_bounce_error;
1014 btrfsic_read_from_block_data(
1015 sf->block_ctx, &root_item,
1016 root_item_offset,
1017 item_size);
1018 next_bytenr = btrfs_root_bytenr(&root_item);
1019
1020 sf->error =
1021 btrfsic_create_link_to_next_block(
1022 state,
1023 sf->block,
1024 sf->block_ctx,
1025 next_bytenr,
1026 sf->limit_nesting,
1027 &sf->next_block_ctx,
1028 &sf->next_block,
1029 force_iodone_flag,
1030 &sf->num_copies,
1031 &sf->mirror_num,
1032 disk_key,
1033 btrfs_root_generation(
1034 &root_item));
1035 if (sf->error)
1036 goto one_stack_frame_backwards;
1037
1038 if (NULL != sf->next_block) {
1039 struct btrfs_header *const next_hdr =
1040 (struct btrfs_header *)
1041 sf->next_block_ctx.datav[0];
1042
1043 next_stack =
1044 btrfsic_stack_frame_alloc();
1045 if (NULL == next_stack) {
1046 sf->error = -1;
1047 btrfsic_release_block_ctx(
1048 &sf->
1049 next_block_ctx);
1050 goto one_stack_frame_backwards;
1051 }
1052
1053 next_stack->i = -1;
1054 next_stack->block = sf->next_block;
1055 next_stack->block_ctx =
1056 &sf->next_block_ctx;
1057 next_stack->next_block = NULL;
1058 next_stack->hdr = next_hdr;
1059 next_stack->limit_nesting =
1060 sf->limit_nesting - 1;
1061 next_stack->prev = sf;
1062 sf = next_stack;
1063 goto continue_with_new_stack_frame;
1064 }
1065 } else if (BTRFS_EXTENT_DATA_KEY == type &&
1066 state->include_extent_data) {
1067 sf->error = btrfsic_handle_extent_data(
1068 state,
1069 sf->block,
1070 sf->block_ctx,
1071 item_offset,
1072 force_iodone_flag);
1073 if (sf->error)
1074 goto one_stack_frame_backwards;
1075 }
1076
1077 goto continue_with_current_leaf_stack_frame;
1078 }
1079 } else {
1080 struct btrfs_node *const nodehdr = (struct btrfs_node *)sf->hdr;
1081
1082 if (-1 == sf->i) {
1083 sf->nr = btrfs_stack_header_nritems(&nodehdr->header);
1084
1085 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1086 pr_info("node %llu level %d items %d generation %llu owner %llu\n",
1087 sf->block_ctx->start,
1088 nodehdr->header.level, sf->nr,
1089 btrfs_stack_header_generation(
1090 &nodehdr->header),
1091 btrfs_stack_header_owner(
1092 &nodehdr->header));
1093 }
1094
1095continue_with_current_node_stack_frame:
1096 if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
1097 sf->i++;
1098 sf->num_copies = 0;
1099 }
1100
1101 if (sf->i < sf->nr) {
1102 struct btrfs_key_ptr key_ptr;
1103 u32 key_ptr_offset;
1104 u64 next_bytenr;
1105
1106 key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) -
1107 (uintptr_t)nodehdr;
1108 if (key_ptr_offset + sizeof(struct btrfs_key_ptr) >
1109 sf->block_ctx->len) {
1110 pr_info("btrfsic: node item out of bounce at logical %llu, dev %s\n",
1111 sf->block_ctx->start,
1112 sf->block_ctx->dev->name);
1113 goto one_stack_frame_backwards;
1114 }
1115 btrfsic_read_from_block_data(
1116 sf->block_ctx, &key_ptr, key_ptr_offset,
1117 sizeof(struct btrfs_key_ptr));
1118 next_bytenr = btrfs_stack_key_blockptr(&key_ptr);
1119
1120 sf->error = btrfsic_create_link_to_next_block(
1121 state,
1122 sf->block,
1123 sf->block_ctx,
1124 next_bytenr,
1125 sf->limit_nesting,
1126 &sf->next_block_ctx,
1127 &sf->next_block,
1128 force_iodone_flag,
1129 &sf->num_copies,
1130 &sf->mirror_num,
1131 &key_ptr.key,
1132 btrfs_stack_key_generation(&key_ptr));
1133 if (sf->error)
1134 goto one_stack_frame_backwards;
1135
1136 if (NULL != sf->next_block) {
1137 struct btrfs_header *const next_hdr =
1138 (struct btrfs_header *)
1139 sf->next_block_ctx.datav[0];
1140
1141 next_stack = btrfsic_stack_frame_alloc();
1142 if (NULL == next_stack) {
1143 sf->error = -1;
1144 goto one_stack_frame_backwards;
1145 }
1146
1147 next_stack->i = -1;
1148 next_stack->block = sf->next_block;
1149 next_stack->block_ctx = &sf->next_block_ctx;
1150 next_stack->next_block = NULL;
1151 next_stack->hdr = next_hdr;
1152 next_stack->limit_nesting =
1153 sf->limit_nesting - 1;
1154 next_stack->prev = sf;
1155 sf = next_stack;
1156 goto continue_with_new_stack_frame;
1157 }
1158
1159 goto continue_with_current_node_stack_frame;
1160 }
1161 }
1162
1163one_stack_frame_backwards:
1164 if (NULL != sf->prev) {
1165 struct btrfsic_stack_frame *const prev = sf->prev;
1166
1167 /* the one for the initial block is freed in the caller */
1168 btrfsic_release_block_ctx(sf->block_ctx);
1169
1170 if (sf->error) {
1171 prev->error = sf->error;
1172 btrfsic_stack_frame_free(sf);
1173 sf = prev;
1174 goto one_stack_frame_backwards;
1175 }
1176
1177 btrfsic_stack_frame_free(sf);
1178 sf = prev;
1179 goto continue_with_new_stack_frame;
1180 } else {
1181 BUG_ON(&initial_stack_frame != sf);
1182 }
1183
1184 return sf->error;
1185}
1186
1187static void btrfsic_read_from_block_data(
1188 struct btrfsic_block_data_ctx *block_ctx,
1189 void *dstv, u32 offset, size_t len)
1190{
1191 size_t cur;
1192 size_t pgoff;
1193 char *kaddr;
1194 char *dst = (char *)dstv;
1195 size_t start_offset = offset_in_page(block_ctx->start);
1196 unsigned long i = (start_offset + offset) >> PAGE_SHIFT;
1197
1198 WARN_ON(offset + len > block_ctx->len);
1199 pgoff = offset_in_page(start_offset + offset);
1200
1201 while (len > 0) {
1202 cur = min(len, ((size_t)PAGE_SIZE - pgoff));
1203 BUG_ON(i >= DIV_ROUND_UP(block_ctx->len, PAGE_SIZE));
1204 kaddr = block_ctx->datav[i];
1205 memcpy(dst, kaddr + pgoff, cur);
1206
1207 dst += cur;
1208 len -= cur;
1209 pgoff = 0;
1210 i++;
1211 }
1212}
1213
1214static int btrfsic_create_link_to_next_block(
1215 struct btrfsic_state *state,
1216 struct btrfsic_block *block,
1217 struct btrfsic_block_data_ctx *block_ctx,
1218 u64 next_bytenr,
1219 int limit_nesting,
1220 struct btrfsic_block_data_ctx *next_block_ctx,
1221 struct btrfsic_block **next_blockp,
1222 int force_iodone_flag,
1223 int *num_copiesp, int *mirror_nump,
1224 struct btrfs_disk_key *disk_key,
1225 u64 parent_generation)
1226{
1227 struct btrfs_fs_info *fs_info = state->fs_info;
1228 struct btrfsic_block *next_block = NULL;
1229 int ret;
1230 struct btrfsic_block_link *l;
1231 int did_alloc_block_link;
1232 int block_was_created;
1233
1234 *next_blockp = NULL;
1235 if (0 == *num_copiesp) {
1236 *num_copiesp = btrfs_num_copies(fs_info, next_bytenr,
1237 state->metablock_size);
1238 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
1239 pr_info("num_copies(log_bytenr=%llu) = %d\n",
1240 next_bytenr, *num_copiesp);
1241 *mirror_nump = 1;
1242 }
1243
1244 if (*mirror_nump > *num_copiesp)
1245 return 0;
1246
1247 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1248 pr_info("btrfsic_create_link_to_next_block(mirror_num=%d)\n",
1249 *mirror_nump);
1250 ret = btrfsic_map_block(state, next_bytenr,
1251 state->metablock_size,
1252 next_block_ctx, *mirror_nump);
1253 if (ret) {
1254 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
1255 next_bytenr, *mirror_nump);
1256 btrfsic_release_block_ctx(next_block_ctx);
1257 *next_blockp = NULL;
1258 return -1;
1259 }
1260
1261 next_block = btrfsic_block_lookup_or_add(state,
1262 next_block_ctx, "referenced ",
1263 1, force_iodone_flag,
1264 !force_iodone_flag,
1265 *mirror_nump,
1266 &block_was_created);
1267 if (NULL == next_block) {
1268 btrfsic_release_block_ctx(next_block_ctx);
1269 *next_blockp = NULL;
1270 return -1;
1271 }
1272 if (block_was_created) {
1273 l = NULL;
1274 next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
1275 } else {
1276 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) {
1277 if (next_block->logical_bytenr != next_bytenr &&
1278 !(!next_block->is_metadata &&
1279 0 == next_block->logical_bytenr))
1280 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, %c, bytenr mismatch (!= stored %llu).\n",
1281 next_bytenr, next_block_ctx->dev->name,
1282 next_block_ctx->dev_bytenr, *mirror_nump,
1283 btrfsic_get_block_type(state,
1284 next_block),
1285 next_block->logical_bytenr);
1286 else
1287 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1288 next_bytenr, next_block_ctx->dev->name,
1289 next_block_ctx->dev_bytenr, *mirror_nump,
1290 btrfsic_get_block_type(state,
1291 next_block));
1292 }
1293 next_block->logical_bytenr = next_bytenr;
1294
1295 next_block->mirror_num = *mirror_nump;
1296 l = btrfsic_block_link_hashtable_lookup(
1297 next_block_ctx->dev->bdev,
1298 next_block_ctx->dev_bytenr,
1299 block_ctx->dev->bdev,
1300 block_ctx->dev_bytenr,
1301 &state->block_link_hashtable);
1302 }
1303
1304 next_block->disk_key = *disk_key;
1305 if (NULL == l) {
1306 l = btrfsic_block_link_alloc();
1307 if (NULL == l) {
1308 btrfsic_release_block_ctx(next_block_ctx);
1309 *next_blockp = NULL;
1310 return -1;
1311 }
1312
1313 did_alloc_block_link = 1;
1314 l->block_ref_to = next_block;
1315 l->block_ref_from = block;
1316 l->ref_cnt = 1;
1317 l->parent_generation = parent_generation;
1318
1319 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1320 btrfsic_print_add_link(state, l);
1321
1322 list_add(&l->node_ref_to, &block->ref_to_list);
1323 list_add(&l->node_ref_from, &next_block->ref_from_list);
1324
1325 btrfsic_block_link_hashtable_add(l,
1326 &state->block_link_hashtable);
1327 } else {
1328 did_alloc_block_link = 0;
1329 if (0 == limit_nesting) {
1330 l->ref_cnt++;
1331 l->parent_generation = parent_generation;
1332 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1333 btrfsic_print_add_link(state, l);
1334 }
1335 }
1336
1337 if (limit_nesting > 0 && did_alloc_block_link) {
1338 ret = btrfsic_read_block(state, next_block_ctx);
1339 if (ret < (int)next_block_ctx->len) {
1340 pr_info("btrfsic: read block @logical %llu failed!\n",
1341 next_bytenr);
1342 btrfsic_release_block_ctx(next_block_ctx);
1343 *next_blockp = NULL;
1344 return -1;
1345 }
1346
1347 *next_blockp = next_block;
1348 } else {
1349 *next_blockp = NULL;
1350 }
1351 (*mirror_nump)++;
1352
1353 return 0;
1354}
1355
1356static int btrfsic_handle_extent_data(
1357 struct btrfsic_state *state,
1358 struct btrfsic_block *block,
1359 struct btrfsic_block_data_ctx *block_ctx,
1360 u32 item_offset, int force_iodone_flag)
1361{
1362 struct btrfs_fs_info *fs_info = state->fs_info;
1363 struct btrfs_file_extent_item file_extent_item;
1364 u64 file_extent_item_offset;
1365 u64 next_bytenr;
1366 u64 num_bytes;
1367 u64 generation;
1368 struct btrfsic_block_link *l;
1369 int ret;
1370
1371 file_extent_item_offset = offsetof(struct btrfs_leaf, items) +
1372 item_offset;
1373 if (file_extent_item_offset +
1374 offsetof(struct btrfs_file_extent_item, disk_num_bytes) >
1375 block_ctx->len) {
1376 pr_info("btrfsic: file item out of bounce at logical %llu, dev %s\n",
1377 block_ctx->start, block_ctx->dev->name);
1378 return -1;
1379 }
1380
1381 btrfsic_read_from_block_data(block_ctx, &file_extent_item,
1382 file_extent_item_offset,
1383 offsetof(struct btrfs_file_extent_item, disk_num_bytes));
1384 if (BTRFS_FILE_EXTENT_REG != file_extent_item.type ||
1385 btrfs_stack_file_extent_disk_bytenr(&file_extent_item) == 0) {
1386 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1387 pr_info("extent_data: type %u, disk_bytenr = %llu\n",
1388 file_extent_item.type,
1389 btrfs_stack_file_extent_disk_bytenr(
1390 &file_extent_item));
1391 return 0;
1392 }
1393
1394 if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) >
1395 block_ctx->len) {
1396 pr_info("btrfsic: file item out of bounce at logical %llu, dev %s\n",
1397 block_ctx->start, block_ctx->dev->name);
1398 return -1;
1399 }
1400 btrfsic_read_from_block_data(block_ctx, &file_extent_item,
1401 file_extent_item_offset,
1402 sizeof(struct btrfs_file_extent_item));
1403 next_bytenr = btrfs_stack_file_extent_disk_bytenr(&file_extent_item);
1404 if (btrfs_stack_file_extent_compression(&file_extent_item) ==
1405 BTRFS_COMPRESS_NONE) {
1406 next_bytenr += btrfs_stack_file_extent_offset(&file_extent_item);
1407 num_bytes = btrfs_stack_file_extent_num_bytes(&file_extent_item);
1408 } else {
1409 num_bytes = btrfs_stack_file_extent_disk_num_bytes(&file_extent_item);
1410 }
1411 generation = btrfs_stack_file_extent_generation(&file_extent_item);
1412
1413 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1414 pr_info("extent_data: type %u, disk_bytenr = %llu, offset = %llu, num_bytes = %llu\n",
1415 file_extent_item.type,
1416 btrfs_stack_file_extent_disk_bytenr(&file_extent_item),
1417 btrfs_stack_file_extent_offset(&file_extent_item),
1418 num_bytes);
1419 while (num_bytes > 0) {
1420 u32 chunk_len;
1421 int num_copies;
1422 int mirror_num;
1423
1424 if (num_bytes > state->datablock_size)
1425 chunk_len = state->datablock_size;
1426 else
1427 chunk_len = num_bytes;
1428
1429 num_copies = btrfs_num_copies(fs_info, next_bytenr,
1430 state->datablock_size);
1431 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
1432 pr_info("num_copies(log_bytenr=%llu) = %d\n",
1433 next_bytenr, num_copies);
1434 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
1435 struct btrfsic_block_data_ctx next_block_ctx;
1436 struct btrfsic_block *next_block;
1437 int block_was_created;
1438
1439 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1440 pr_info("btrfsic_handle_extent_data(mirror_num=%d)\n",
1441 mirror_num);
1442 if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
1443 pr_info("\tdisk_bytenr = %llu, num_bytes %u\n",
1444 next_bytenr, chunk_len);
1445 ret = btrfsic_map_block(state, next_bytenr,
1446 chunk_len, &next_block_ctx,
1447 mirror_num);
1448 if (ret) {
1449 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
1450 next_bytenr, mirror_num);
1451 return -1;
1452 }
1453
1454 next_block = btrfsic_block_lookup_or_add(
1455 state,
1456 &next_block_ctx,
1457 "referenced ",
1458 0,
1459 force_iodone_flag,
1460 !force_iodone_flag,
1461 mirror_num,
1462 &block_was_created);
1463 if (NULL == next_block) {
1464 btrfsic_release_block_ctx(&next_block_ctx);
1465 return -1;
1466 }
1467 if (!block_was_created) {
1468 if ((state->print_mask &
1469 BTRFSIC_PRINT_MASK_VERBOSE) &&
1470 next_block->logical_bytenr != next_bytenr &&
1471 !(!next_block->is_metadata &&
1472 0 == next_block->logical_bytenr)) {
1473 pr_info("Referenced block @%llu (%s/%llu/%d) found in hash table, D, bytenr mismatch (!= stored %llu).\n",
1474 next_bytenr,
1475 next_block_ctx.dev->name,
1476 next_block_ctx.dev_bytenr,
1477 mirror_num,
1478 next_block->logical_bytenr);
1479 }
1480 next_block->logical_bytenr = next_bytenr;
1481 next_block->mirror_num = mirror_num;
1482 }
1483
1484 l = btrfsic_block_link_lookup_or_add(state,
1485 &next_block_ctx,
1486 next_block, block,
1487 generation);
1488 btrfsic_release_block_ctx(&next_block_ctx);
1489 if (NULL == l)
1490 return -1;
1491 }
1492
1493 next_bytenr += chunk_len;
1494 num_bytes -= chunk_len;
1495 }
1496
1497 return 0;
1498}
1499
1500static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
1501 struct btrfsic_block_data_ctx *block_ctx_out,
1502 int mirror_num)
1503{
1504 struct btrfs_fs_info *fs_info = state->fs_info;
1505 int ret;
1506 u64 length;
1507 struct btrfs_bio *multi = NULL;
1508 struct btrfs_device *device;
1509
1510 length = len;
1511 ret = btrfs_map_block(fs_info, BTRFS_MAP_READ,
1512 bytenr, &length, &multi, mirror_num);
1513
1514 if (ret) {
1515 block_ctx_out->start = 0;
1516 block_ctx_out->dev_bytenr = 0;
1517 block_ctx_out->len = 0;
1518 block_ctx_out->dev = NULL;
1519 block_ctx_out->datav = NULL;
1520 block_ctx_out->pagev = NULL;
1521 block_ctx_out->mem_to_free = NULL;
1522
1523 return ret;
1524 }
1525
1526 device = multi->stripes[0].dev;
1527 if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state) ||
1528 !device->bdev || !device->name)
1529 block_ctx_out->dev = NULL;
1530 else
1531 block_ctx_out->dev = btrfsic_dev_state_lookup(
1532 device->bdev->bd_dev);
1533 block_ctx_out->dev_bytenr = multi->stripes[0].physical;
1534 block_ctx_out->start = bytenr;
1535 block_ctx_out->len = len;
1536 block_ctx_out->datav = NULL;
1537 block_ctx_out->pagev = NULL;
1538 block_ctx_out->mem_to_free = NULL;
1539
1540 kfree(multi);
1541 if (NULL == block_ctx_out->dev) {
1542 ret = -ENXIO;
1543 pr_info("btrfsic: error, cannot lookup dev (#1)!\n");
1544 }
1545
1546 return ret;
1547}
1548
1549static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx)
1550{
1551 if (block_ctx->mem_to_free) {
1552 unsigned int num_pages;
1553
1554 BUG_ON(!block_ctx->datav);
1555 BUG_ON(!block_ctx->pagev);
1556 num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
1557 PAGE_SHIFT;
1558 /* Pages must be unmapped in reverse order */
1559 while (num_pages > 0) {
1560 num_pages--;
1561 if (block_ctx->datav[num_pages]) {
1562 kunmap_local(block_ctx->datav[num_pages]);
1563 block_ctx->datav[num_pages] = NULL;
1564 }
1565 if (block_ctx->pagev[num_pages]) {
1566 __free_page(block_ctx->pagev[num_pages]);
1567 block_ctx->pagev[num_pages] = NULL;
1568 }
1569 }
1570
1571 kfree(block_ctx->mem_to_free);
1572 block_ctx->mem_to_free = NULL;
1573 block_ctx->pagev = NULL;
1574 block_ctx->datav = NULL;
1575 }
1576}
1577
1578static int btrfsic_read_block(struct btrfsic_state *state,
1579 struct btrfsic_block_data_ctx *block_ctx)
1580{
1581 unsigned int num_pages;
1582 unsigned int i;
1583 size_t size;
1584 u64 dev_bytenr;
1585 int ret;
1586
1587 BUG_ON(block_ctx->datav);
1588 BUG_ON(block_ctx->pagev);
1589 BUG_ON(block_ctx->mem_to_free);
1590 if (!PAGE_ALIGNED(block_ctx->dev_bytenr)) {
1591 pr_info("btrfsic: read_block() with unaligned bytenr %llu\n",
1592 block_ctx->dev_bytenr);
1593 return -1;
1594 }
1595
1596 num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
1597 PAGE_SHIFT;
1598 size = sizeof(*block_ctx->datav) + sizeof(*block_ctx->pagev);
1599 block_ctx->mem_to_free = kcalloc(num_pages, size, GFP_NOFS);
1600 if (!block_ctx->mem_to_free)
1601 return -ENOMEM;
1602 block_ctx->datav = block_ctx->mem_to_free;
1603 block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages);
1604 for (i = 0; i < num_pages; i++) {
1605 block_ctx->pagev[i] = alloc_page(GFP_NOFS);
1606 if (!block_ctx->pagev[i])
1607 return -1;
1608 }
1609
1610 dev_bytenr = block_ctx->dev_bytenr;
1611 for (i = 0; i < num_pages;) {
1612 struct bio *bio;
1613 unsigned int j;
1614
1615 bio = btrfs_io_bio_alloc(num_pages - i);
1616 bio_set_dev(bio, block_ctx->dev->bdev);
1617 bio->bi_iter.bi_sector = dev_bytenr >> 9;
1618 bio->bi_opf = REQ_OP_READ;
1619
1620 for (j = i; j < num_pages; j++) {
1621 ret = bio_add_page(bio, block_ctx->pagev[j],
1622 PAGE_SIZE, 0);
1623 if (PAGE_SIZE != ret)
1624 break;
1625 }
1626 if (j == i) {
1627 pr_info("btrfsic: error, failed to add a single page!\n");
1628 return -1;
1629 }
1630 if (submit_bio_wait(bio)) {
1631 pr_info("btrfsic: read error at logical %llu dev %s!\n",
1632 block_ctx->start, block_ctx->dev->name);
1633 bio_put(bio);
1634 return -1;
1635 }
1636 bio_put(bio);
1637 dev_bytenr += (j - i) * PAGE_SIZE;
1638 i = j;
1639 }
1640 for (i = 0; i < num_pages; i++)
1641 block_ctx->datav[i] = kmap_local_page(block_ctx->pagev[i]);
1642
1643 return block_ctx->len;
1644}
1645
1646static void btrfsic_dump_database(struct btrfsic_state *state)
1647{
1648 const struct btrfsic_block *b_all;
1649
1650 BUG_ON(NULL == state);
1651
1652 pr_info("all_blocks_list:\n");
1653 list_for_each_entry(b_all, &state->all_blocks_list, all_blocks_node) {
1654 const struct btrfsic_block_link *l;
1655
1656 pr_info("%c-block @%llu (%s/%llu/%d)\n",
1657 btrfsic_get_block_type(state, b_all),
1658 b_all->logical_bytenr, b_all->dev_state->name,
1659 b_all->dev_bytenr, b_all->mirror_num);
1660
1661 list_for_each_entry(l, &b_all->ref_to_list, node_ref_to) {
1662 pr_info(" %c @%llu (%s/%llu/%d) refers %u* to %c @%llu (%s/%llu/%d)\n",
1663 btrfsic_get_block_type(state, b_all),
1664 b_all->logical_bytenr, b_all->dev_state->name,
1665 b_all->dev_bytenr, b_all->mirror_num,
1666 l->ref_cnt,
1667 btrfsic_get_block_type(state, l->block_ref_to),
1668 l->block_ref_to->logical_bytenr,
1669 l->block_ref_to->dev_state->name,
1670 l->block_ref_to->dev_bytenr,
1671 l->block_ref_to->mirror_num);
1672 }
1673
1674 list_for_each_entry(l, &b_all->ref_from_list, node_ref_from) {
1675 pr_info(" %c @%llu (%s/%llu/%d) is ref %u* from %c @%llu (%s/%llu/%d)\n",
1676 btrfsic_get_block_type(state, b_all),
1677 b_all->logical_bytenr, b_all->dev_state->name,
1678 b_all->dev_bytenr, b_all->mirror_num,
1679 l->ref_cnt,
1680 btrfsic_get_block_type(state, l->block_ref_from),
1681 l->block_ref_from->logical_bytenr,
1682 l->block_ref_from->dev_state->name,
1683 l->block_ref_from->dev_bytenr,
1684 l->block_ref_from->mirror_num);
1685 }
1686
1687 pr_info("\n");
1688 }
1689}
1690
1691/*
1692 * Test whether the disk block contains a tree block (leaf or node)
1693 * (note that this test fails for the super block)
1694 */
1695static noinline_for_stack int btrfsic_test_for_metadata(
1696 struct btrfsic_state *state,
1697 char **datav, unsigned int num_pages)
1698{
1699 struct btrfs_fs_info *fs_info = state->fs_info;
1700 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
1701 struct btrfs_header *h;
1702 u8 csum[BTRFS_CSUM_SIZE];
1703 unsigned int i;
1704
1705 if (num_pages * PAGE_SIZE < state->metablock_size)
1706 return 1; /* not metadata */
1707 num_pages = state->metablock_size >> PAGE_SHIFT;
1708 h = (struct btrfs_header *)datav[0];
1709
1710 if (memcmp(h->fsid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE))
1711 return 1;
1712
1713 shash->tfm = fs_info->csum_shash;
1714 crypto_shash_init(shash);
1715
1716 for (i = 0; i < num_pages; i++) {
1717 u8 *data = i ? datav[i] : (datav[i] + BTRFS_CSUM_SIZE);
1718 size_t sublen = i ? PAGE_SIZE :
1719 (PAGE_SIZE - BTRFS_CSUM_SIZE);
1720
1721 crypto_shash_update(shash, data, sublen);
1722 }
1723 crypto_shash_final(shash, csum);
1724 if (memcmp(csum, h->csum, fs_info->csum_size))
1725 return 1;
1726
1727 return 0; /* is metadata */
1728}
1729
1730static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
1731 u64 dev_bytenr, char **mapped_datav,
1732 unsigned int num_pages,
1733 struct bio *bio, int *bio_is_patched,
1734 int submit_bio_bh_rw)
1735{
1736 int is_metadata;
1737 struct btrfsic_block *block;
1738 struct btrfsic_block_data_ctx block_ctx;
1739 int ret;
1740 struct btrfsic_state *state = dev_state->state;
1741 struct block_device *bdev = dev_state->bdev;
1742 unsigned int processed_len;
1743
1744 if (NULL != bio_is_patched)
1745 *bio_is_patched = 0;
1746
1747again:
1748 if (num_pages == 0)
1749 return;
1750
1751 processed_len = 0;
1752 is_metadata = (0 == btrfsic_test_for_metadata(state, mapped_datav,
1753 num_pages));
1754
1755 block = btrfsic_block_hashtable_lookup(bdev, dev_bytenr,
1756 &state->block_hashtable);
1757 if (NULL != block) {
1758 u64 bytenr = 0;
1759 struct btrfsic_block_link *l, *tmp;
1760
1761 if (block->is_superblock) {
1762 bytenr = btrfs_super_bytenr((struct btrfs_super_block *)
1763 mapped_datav[0]);
1764 if (num_pages * PAGE_SIZE <
1765 BTRFS_SUPER_INFO_SIZE) {
1766 pr_info("btrfsic: cannot work with too short bios!\n");
1767 return;
1768 }
1769 is_metadata = 1;
1770 BUG_ON(!PAGE_ALIGNED(BTRFS_SUPER_INFO_SIZE));
1771 processed_len = BTRFS_SUPER_INFO_SIZE;
1772 if (state->print_mask &
1773 BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE) {
1774 pr_info("[before new superblock is written]:\n");
1775 btrfsic_dump_tree_sub(state, block, 0);
1776 }
1777 }
1778 if (is_metadata) {
1779 if (!block->is_superblock) {
1780 if (num_pages * PAGE_SIZE <
1781 state->metablock_size) {
1782 pr_info("btrfsic: cannot work with too short bios!\n");
1783 return;
1784 }
1785 processed_len = state->metablock_size;
1786 bytenr = btrfs_stack_header_bytenr(
1787 (struct btrfs_header *)
1788 mapped_datav[0]);
1789 btrfsic_cmp_log_and_dev_bytenr(state, bytenr,
1790 dev_state,
1791 dev_bytenr);
1792 }
1793 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) {
1794 if (block->logical_bytenr != bytenr &&
1795 !(!block->is_metadata &&
1796 block->logical_bytenr == 0))
1797 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c, bytenr mismatch (!= stored %llu).\n",
1798 bytenr, dev_state->name,
1799 dev_bytenr,
1800 block->mirror_num,
1801 btrfsic_get_block_type(state,
1802 block),
1803 block->logical_bytenr);
1804 else
1805 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1806 bytenr, dev_state->name,
1807 dev_bytenr, block->mirror_num,
1808 btrfsic_get_block_type(state,
1809 block));
1810 }
1811 block->logical_bytenr = bytenr;
1812 } else {
1813 if (num_pages * PAGE_SIZE <
1814 state->datablock_size) {
1815 pr_info("btrfsic: cannot work with too short bios!\n");
1816 return;
1817 }
1818 processed_len = state->datablock_size;
1819 bytenr = block->logical_bytenr;
1820 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1821 pr_info("Written block @%llu (%s/%llu/%d) found in hash table, %c.\n",
1822 bytenr, dev_state->name, dev_bytenr,
1823 block->mirror_num,
1824 btrfsic_get_block_type(state, block));
1825 }
1826
1827 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1828 pr_info("ref_to_list: %cE, ref_from_list: %cE\n",
1829 list_empty(&block->ref_to_list) ? ' ' : '!',
1830 list_empty(&block->ref_from_list) ? ' ' : '!');
1831 if (btrfsic_is_block_ref_by_superblock(state, block, 0)) {
1832 pr_info("btrfs: attempt to overwrite %c-block @%llu (%s/%llu/%d), old(gen=%llu, objectid=%llu, type=%d, offset=%llu), new(gen=%llu), which is referenced by most recent superblock (superblockgen=%llu)!\n",
1833 btrfsic_get_block_type(state, block), bytenr,
1834 dev_state->name, dev_bytenr, block->mirror_num,
1835 block->generation,
1836 btrfs_disk_key_objectid(&block->disk_key),
1837 block->disk_key.type,
1838 btrfs_disk_key_offset(&block->disk_key),
1839 btrfs_stack_header_generation(
1840 (struct btrfs_header *) mapped_datav[0]),
1841 state->max_superblock_generation);
1842 btrfsic_dump_tree(state);
1843 }
1844
1845 if (!block->is_iodone && !block->never_written) {
1846 pr_info("btrfs: attempt to overwrite %c-block @%llu (%s/%llu/%d), oldgen=%llu, newgen=%llu, which is not yet iodone!\n",
1847 btrfsic_get_block_type(state, block), bytenr,
1848 dev_state->name, dev_bytenr, block->mirror_num,
1849 block->generation,
1850 btrfs_stack_header_generation(
1851 (struct btrfs_header *)
1852 mapped_datav[0]));
1853 /* it would not be safe to go on */
1854 btrfsic_dump_tree(state);
1855 goto continue_loop;
1856 }
1857
1858 /*
1859 * Clear all references of this block. Do not free
1860 * the block itself even if is not referenced anymore
1861 * because it still carries valuable information
1862 * like whether it was ever written and IO completed.
1863 */
1864 list_for_each_entry_safe(l, tmp, &block->ref_to_list,
1865 node_ref_to) {
1866 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1867 btrfsic_print_rem_link(state, l);
1868 l->ref_cnt--;
1869 if (0 == l->ref_cnt) {
1870 list_del(&l->node_ref_to);
1871 list_del(&l->node_ref_from);
1872 btrfsic_block_link_hashtable_remove(l);
1873 btrfsic_block_link_free(l);
1874 }
1875 }
1876
1877 block_ctx.dev = dev_state;
1878 block_ctx.dev_bytenr = dev_bytenr;
1879 block_ctx.start = bytenr;
1880 block_ctx.len = processed_len;
1881 block_ctx.pagev = NULL;
1882 block_ctx.mem_to_free = NULL;
1883 block_ctx.datav = mapped_datav;
1884
1885 if (is_metadata || state->include_extent_data) {
1886 block->never_written = 0;
1887 block->iodone_w_error = 0;
1888 if (NULL != bio) {
1889 block->is_iodone = 0;
1890 BUG_ON(NULL == bio_is_patched);
1891 if (!*bio_is_patched) {
1892 block->orig_bio_private =
1893 bio->bi_private;
1894 block->orig_bio_end_io =
1895 bio->bi_end_io;
1896 block->next_in_same_bio = NULL;
1897 bio->bi_private = block;
1898 bio->bi_end_io = btrfsic_bio_end_io;
1899 *bio_is_patched = 1;
1900 } else {
1901 struct btrfsic_block *chained_block =
1902 (struct btrfsic_block *)
1903 bio->bi_private;
1904
1905 BUG_ON(NULL == chained_block);
1906 block->orig_bio_private =
1907 chained_block->orig_bio_private;
1908 block->orig_bio_end_io =
1909 chained_block->orig_bio_end_io;
1910 block->next_in_same_bio = chained_block;
1911 bio->bi_private = block;
1912 }
1913 } else {
1914 block->is_iodone = 1;
1915 block->orig_bio_private = NULL;
1916 block->orig_bio_end_io = NULL;
1917 block->next_in_same_bio = NULL;
1918 }
1919 }
1920
1921 block->flush_gen = dev_state->last_flush_gen + 1;
1922 block->submit_bio_bh_rw = submit_bio_bh_rw;
1923 if (is_metadata) {
1924 block->logical_bytenr = bytenr;
1925 block->is_metadata = 1;
1926 if (block->is_superblock) {
1927 BUG_ON(PAGE_SIZE !=
1928 BTRFS_SUPER_INFO_SIZE);
1929 ret = btrfsic_process_written_superblock(
1930 state,
1931 block,
1932 (struct btrfs_super_block *)
1933 mapped_datav[0]);
1934 if (state->print_mask &
1935 BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE) {
1936 pr_info("[after new superblock is written]:\n");
1937 btrfsic_dump_tree_sub(state, block, 0);
1938 }
1939 } else {
1940 block->mirror_num = 0; /* unknown */
1941 ret = btrfsic_process_metablock(
1942 state,
1943 block,
1944 &block_ctx,
1945 0, 0);
1946 }
1947 if (ret)
1948 pr_info("btrfsic: btrfsic_process_metablock(root @%llu) failed!\n",
1949 dev_bytenr);
1950 } else {
1951 block->is_metadata = 0;
1952 block->mirror_num = 0; /* unknown */
1953 block->generation = BTRFSIC_GENERATION_UNKNOWN;
1954 if (!state->include_extent_data
1955 && list_empty(&block->ref_from_list)) {
1956 /*
1957 * disk block is overwritten with extent
1958 * data (not meta data) and we are configured
1959 * to not include extent data: take the
1960 * chance and free the block's memory
1961 */
1962 btrfsic_block_hashtable_remove(block);
1963 list_del(&block->all_blocks_node);
1964 btrfsic_block_free(block);
1965 }
1966 }
1967 btrfsic_release_block_ctx(&block_ctx);
1968 } else {
1969 /* block has not been found in hash table */
1970 u64 bytenr;
1971
1972 if (!is_metadata) {
1973 processed_len = state->datablock_size;
1974 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1975 pr_info("Written block (%s/%llu/?) !found in hash table, D.\n",
1976 dev_state->name, dev_bytenr);
1977 if (!state->include_extent_data) {
1978 /* ignore that written D block */
1979 goto continue_loop;
1980 }
1981
1982 /* this is getting ugly for the
1983 * include_extent_data case... */
1984 bytenr = 0; /* unknown */
1985 } else {
1986 processed_len = state->metablock_size;
1987 bytenr = btrfs_stack_header_bytenr(
1988 (struct btrfs_header *)
1989 mapped_datav[0]);
1990 btrfsic_cmp_log_and_dev_bytenr(state, bytenr, dev_state,
1991 dev_bytenr);
1992 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
1993 pr_info("Written block @%llu (%s/%llu/?) !found in hash table, M.\n",
1994 bytenr, dev_state->name, dev_bytenr);
1995 }
1996
1997 block_ctx.dev = dev_state;
1998 block_ctx.dev_bytenr = dev_bytenr;
1999 block_ctx.start = bytenr;
2000 block_ctx.len = processed_len;
2001 block_ctx.pagev = NULL;
2002 block_ctx.mem_to_free = NULL;
2003 block_ctx.datav = mapped_datav;
2004
2005 block = btrfsic_block_alloc();
2006 if (NULL == block) {
2007 btrfsic_release_block_ctx(&block_ctx);
2008 goto continue_loop;
2009 }
2010 block->dev_state = dev_state;
2011 block->dev_bytenr = dev_bytenr;
2012 block->logical_bytenr = bytenr;
2013 block->is_metadata = is_metadata;
2014 block->never_written = 0;
2015 block->iodone_w_error = 0;
2016 block->mirror_num = 0; /* unknown */
2017 block->flush_gen = dev_state->last_flush_gen + 1;
2018 block->submit_bio_bh_rw = submit_bio_bh_rw;
2019 if (NULL != bio) {
2020 block->is_iodone = 0;
2021 BUG_ON(NULL == bio_is_patched);
2022 if (!*bio_is_patched) {
2023 block->orig_bio_private = bio->bi_private;
2024 block->orig_bio_end_io = bio->bi_end_io;
2025 block->next_in_same_bio = NULL;
2026 bio->bi_private = block;
2027 bio->bi_end_io = btrfsic_bio_end_io;
2028 *bio_is_patched = 1;
2029 } else {
2030 struct btrfsic_block *chained_block =
2031 (struct btrfsic_block *)
2032 bio->bi_private;
2033
2034 BUG_ON(NULL == chained_block);
2035 block->orig_bio_private =
2036 chained_block->orig_bio_private;
2037 block->orig_bio_end_io =
2038 chained_block->orig_bio_end_io;
2039 block->next_in_same_bio = chained_block;
2040 bio->bi_private = block;
2041 }
2042 } else {
2043 block->is_iodone = 1;
2044 block->orig_bio_private = NULL;
2045 block->orig_bio_end_io = NULL;
2046 block->next_in_same_bio = NULL;
2047 }
2048 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2049 pr_info("New written %c-block @%llu (%s/%llu/%d)\n",
2050 is_metadata ? 'M' : 'D',
2051 block->logical_bytenr, block->dev_state->name,
2052 block->dev_bytenr, block->mirror_num);
2053 list_add(&block->all_blocks_node, &state->all_blocks_list);
2054 btrfsic_block_hashtable_add(block, &state->block_hashtable);
2055
2056 if (is_metadata) {
2057 ret = btrfsic_process_metablock(state, block,
2058 &block_ctx, 0, 0);
2059 if (ret)
2060 pr_info("btrfsic: process_metablock(root @%llu) failed!\n",
2061 dev_bytenr);
2062 }
2063 btrfsic_release_block_ctx(&block_ctx);
2064 }
2065
2066continue_loop:
2067 BUG_ON(!processed_len);
2068 dev_bytenr += processed_len;
2069 mapped_datav += processed_len >> PAGE_SHIFT;
2070 num_pages -= processed_len >> PAGE_SHIFT;
2071 goto again;
2072}
2073
2074static void btrfsic_bio_end_io(struct bio *bp)
2075{
2076 struct btrfsic_block *block = (struct btrfsic_block *)bp->bi_private;
2077 int iodone_w_error;
2078
2079 /* mutex is not held! This is not save if IO is not yet completed
2080 * on umount */
2081 iodone_w_error = 0;
2082 if (bp->bi_status)
2083 iodone_w_error = 1;
2084
2085 BUG_ON(NULL == block);
2086 bp->bi_private = block->orig_bio_private;
2087 bp->bi_end_io = block->orig_bio_end_io;
2088
2089 do {
2090 struct btrfsic_block *next_block;
2091 struct btrfsic_dev_state *const dev_state = block->dev_state;
2092
2093 if ((dev_state->state->print_mask &
2094 BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2095 pr_info("bio_end_io(err=%d) for %c @%llu (%s/%llu/%d)\n",
2096 bp->bi_status,
2097 btrfsic_get_block_type(dev_state->state, block),
2098 block->logical_bytenr, dev_state->name,
2099 block->dev_bytenr, block->mirror_num);
2100 next_block = block->next_in_same_bio;
2101 block->iodone_w_error = iodone_w_error;
2102 if (block->submit_bio_bh_rw & REQ_PREFLUSH) {
2103 dev_state->last_flush_gen++;
2104 if ((dev_state->state->print_mask &
2105 BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
2106 pr_info("bio_end_io() new %s flush_gen=%llu\n",
2107 dev_state->name,
2108 dev_state->last_flush_gen);
2109 }
2110 if (block->submit_bio_bh_rw & REQ_FUA)
2111 block->flush_gen = 0; /* FUA completed means block is
2112 * on disk */
2113 block->is_iodone = 1; /* for FLUSH, this releases the block */
2114 block = next_block;
2115 } while (NULL != block);
2116
2117 bp->bi_end_io(bp);
2118}
2119
2120static int btrfsic_process_written_superblock(
2121 struct btrfsic_state *state,
2122 struct btrfsic_block *const superblock,
2123 struct btrfs_super_block *const super_hdr)
2124{
2125 struct btrfs_fs_info *fs_info = state->fs_info;
2126 int pass;
2127
2128 superblock->generation = btrfs_super_generation(super_hdr);
2129 if (!(superblock->generation > state->max_superblock_generation ||
2130 0 == state->max_superblock_generation)) {
2131 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
2132 pr_info("btrfsic: superblock @%llu (%s/%llu/%d) with old gen %llu <= %llu\n",
2133 superblock->logical_bytenr,
2134 superblock->dev_state->name,
2135 superblock->dev_bytenr, superblock->mirror_num,
2136 btrfs_super_generation(super_hdr),
2137 state->max_superblock_generation);
2138 } else {
2139 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
2140 pr_info("btrfsic: got new superblock @%llu (%s/%llu/%d) with new gen %llu > %llu\n",
2141 superblock->logical_bytenr,
2142 superblock->dev_state->name,
2143 superblock->dev_bytenr, superblock->mirror_num,
2144 btrfs_super_generation(super_hdr),
2145 state->max_superblock_generation);
2146
2147 state->max_superblock_generation =
2148 btrfs_super_generation(super_hdr);
2149 state->latest_superblock = superblock;
2150 }
2151
2152 for (pass = 0; pass < 3; pass++) {
2153 int ret;
2154 u64 next_bytenr;
2155 struct btrfsic_block *next_block;
2156 struct btrfsic_block_data_ctx tmp_next_block_ctx;
2157 struct btrfsic_block_link *l;
2158 int num_copies;
2159 int mirror_num;
2160 const char *additional_string = NULL;
2161 struct btrfs_disk_key tmp_disk_key = {0};
2162
2163 btrfs_set_disk_key_objectid(&tmp_disk_key,
2164 BTRFS_ROOT_ITEM_KEY);
2165 btrfs_set_disk_key_objectid(&tmp_disk_key, 0);
2166
2167 switch (pass) {
2168 case 0:
2169 btrfs_set_disk_key_objectid(&tmp_disk_key,
2170 BTRFS_ROOT_TREE_OBJECTID);
2171 additional_string = "root ";
2172 next_bytenr = btrfs_super_root(super_hdr);
2173 if (state->print_mask &
2174 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2175 pr_info("root@%llu\n", next_bytenr);
2176 break;
2177 case 1:
2178 btrfs_set_disk_key_objectid(&tmp_disk_key,
2179 BTRFS_CHUNK_TREE_OBJECTID);
2180 additional_string = "chunk ";
2181 next_bytenr = btrfs_super_chunk_root(super_hdr);
2182 if (state->print_mask &
2183 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2184 pr_info("chunk@%llu\n", next_bytenr);
2185 break;
2186 case 2:
2187 btrfs_set_disk_key_objectid(&tmp_disk_key,
2188 BTRFS_TREE_LOG_OBJECTID);
2189 additional_string = "log ";
2190 next_bytenr = btrfs_super_log_root(super_hdr);
2191 if (0 == next_bytenr)
2192 continue;
2193 if (state->print_mask &
2194 BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
2195 pr_info("log@%llu\n", next_bytenr);
2196 break;
2197 }
2198
2199 num_copies = btrfs_num_copies(fs_info, next_bytenr,
2200 BTRFS_SUPER_INFO_SIZE);
2201 if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
2202 pr_info("num_copies(log_bytenr=%llu) = %d\n",
2203 next_bytenr, num_copies);
2204 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2205 int was_created;
2206
2207 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2208 pr_info("btrfsic_process_written_superblock(mirror_num=%d)\n", mirror_num);
2209 ret = btrfsic_map_block(state, next_bytenr,
2210 BTRFS_SUPER_INFO_SIZE,
2211 &tmp_next_block_ctx,
2212 mirror_num);
2213 if (ret) {
2214 pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
2215 next_bytenr, mirror_num);
2216 return -1;
2217 }
2218
2219 next_block = btrfsic_block_lookup_or_add(
2220 state,
2221 &tmp_next_block_ctx,
2222 additional_string,
2223 1, 0, 1,
2224 mirror_num,
2225 &was_created);
2226 if (NULL == next_block) {
2227 btrfsic_release_block_ctx(&tmp_next_block_ctx);
2228 return -1;
2229 }
2230
2231 next_block->disk_key = tmp_disk_key;
2232 if (was_created)
2233 next_block->generation =
2234 BTRFSIC_GENERATION_UNKNOWN;
2235 l = btrfsic_block_link_lookup_or_add(
2236 state,
2237 &tmp_next_block_ctx,
2238 next_block,
2239 superblock,
2240 BTRFSIC_GENERATION_UNKNOWN);
2241 btrfsic_release_block_ctx(&tmp_next_block_ctx);
2242 if (NULL == l)
2243 return -1;
2244 }
2245 }
2246
2247 if (WARN_ON(-1 == btrfsic_check_all_ref_blocks(state, superblock, 0)))
2248 btrfsic_dump_tree(state);
2249
2250 return 0;
2251}
2252
2253static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state,
2254 struct btrfsic_block *const block,
2255 int recursion_level)
2256{
2257 const struct btrfsic_block_link *l;
2258 int ret = 0;
2259
2260 if (recursion_level >= 3 + BTRFS_MAX_LEVEL) {
2261 /*
2262 * Note that this situation can happen and does not
2263 * indicate an error in regular cases. It happens
2264 * when disk blocks are freed and later reused.
2265 * The check-integrity module is not aware of any
2266 * block free operations, it just recognizes block
2267 * write operations. Therefore it keeps the linkage
2268 * information for a block until a block is
2269 * rewritten. This can temporarily cause incorrect
2270 * and even circular linkage information. This
2271 * causes no harm unless such blocks are referenced
2272 * by the most recent super block.
2273 */
2274 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2275 pr_info("btrfsic: abort cyclic linkage (case 1).\n");
2276
2277 return ret;
2278 }
2279
2280 /*
2281 * This algorithm is recursive because the amount of used stack
2282 * space is very small and the max recursion depth is limited.
2283 */
2284 list_for_each_entry(l, &block->ref_to_list, node_ref_to) {
2285 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2286 pr_info("rl=%d, %c @%llu (%s/%llu/%d) %u* refers to %c @%llu (%s/%llu/%d)\n",
2287 recursion_level,
2288 btrfsic_get_block_type(state, block),
2289 block->logical_bytenr, block->dev_state->name,
2290 block->dev_bytenr, block->mirror_num,
2291 l->ref_cnt,
2292 btrfsic_get_block_type(state, l->block_ref_to),
2293 l->block_ref_to->logical_bytenr,
2294 l->block_ref_to->dev_state->name,
2295 l->block_ref_to->dev_bytenr,
2296 l->block_ref_to->mirror_num);
2297 if (l->block_ref_to->never_written) {
2298 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is never written!\n",
2299 btrfsic_get_block_type(state, l->block_ref_to),
2300 l->block_ref_to->logical_bytenr,
2301 l->block_ref_to->dev_state->name,
2302 l->block_ref_to->dev_bytenr,
2303 l->block_ref_to->mirror_num);
2304 ret = -1;
2305 } else if (!l->block_ref_to->is_iodone) {
2306 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is not yet iodone!\n",
2307 btrfsic_get_block_type(state, l->block_ref_to),
2308 l->block_ref_to->logical_bytenr,
2309 l->block_ref_to->dev_state->name,
2310 l->block_ref_to->dev_bytenr,
2311 l->block_ref_to->mirror_num);
2312 ret = -1;
2313 } else if (l->block_ref_to->iodone_w_error) {
2314 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which has write error!\n",
2315 btrfsic_get_block_type(state, l->block_ref_to),
2316 l->block_ref_to->logical_bytenr,
2317 l->block_ref_to->dev_state->name,
2318 l->block_ref_to->dev_bytenr,
2319 l->block_ref_to->mirror_num);
2320 ret = -1;
2321 } else if (l->parent_generation !=
2322 l->block_ref_to->generation &&
2323 BTRFSIC_GENERATION_UNKNOWN !=
2324 l->parent_generation &&
2325 BTRFSIC_GENERATION_UNKNOWN !=
2326 l->block_ref_to->generation) {
2327 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) with generation %llu != parent generation %llu!\n",
2328 btrfsic_get_block_type(state, l->block_ref_to),
2329 l->block_ref_to->logical_bytenr,
2330 l->block_ref_to->dev_state->name,
2331 l->block_ref_to->dev_bytenr,
2332 l->block_ref_to->mirror_num,
2333 l->block_ref_to->generation,
2334 l->parent_generation);
2335 ret = -1;
2336 } else if (l->block_ref_to->flush_gen >
2337 l->block_ref_to->dev_state->last_flush_gen) {
2338 pr_info("btrfs: attempt to write superblock which references block %c @%llu (%s/%llu/%d) which is not flushed out of disk's write cache (block flush_gen=%llu, dev->flush_gen=%llu)!\n",
2339 btrfsic_get_block_type(state, l->block_ref_to),
2340 l->block_ref_to->logical_bytenr,
2341 l->block_ref_to->dev_state->name,
2342 l->block_ref_to->dev_bytenr,
2343 l->block_ref_to->mirror_num, block->flush_gen,
2344 l->block_ref_to->dev_state->last_flush_gen);
2345 ret = -1;
2346 } else if (-1 == btrfsic_check_all_ref_blocks(state,
2347 l->block_ref_to,
2348 recursion_level +
2349 1)) {
2350 ret = -1;
2351 }
2352 }
2353
2354 return ret;
2355}
2356
2357static int btrfsic_is_block_ref_by_superblock(
2358 const struct btrfsic_state *state,
2359 const struct btrfsic_block *block,
2360 int recursion_level)
2361{
2362 const struct btrfsic_block_link *l;
2363
2364 if (recursion_level >= 3 + BTRFS_MAX_LEVEL) {
2365 /* refer to comment at "abort cyclic linkage (case 1)" */
2366 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2367 pr_info("btrfsic: abort cyclic linkage (case 2).\n");
2368
2369 return 0;
2370 }
2371
2372 /*
2373 * This algorithm is recursive because the amount of used stack space
2374 * is very small and the max recursion depth is limited.
2375 */
2376 list_for_each_entry(l, &block->ref_from_list, node_ref_from) {
2377 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2378 pr_info("rl=%d, %c @%llu (%s/%llu/%d) is ref %u* from %c @%llu (%s/%llu/%d)\n",
2379 recursion_level,
2380 btrfsic_get_block_type(state, block),
2381 block->logical_bytenr, block->dev_state->name,
2382 block->dev_bytenr, block->mirror_num,
2383 l->ref_cnt,
2384 btrfsic_get_block_type(state, l->block_ref_from),
2385 l->block_ref_from->logical_bytenr,
2386 l->block_ref_from->dev_state->name,
2387 l->block_ref_from->dev_bytenr,
2388 l->block_ref_from->mirror_num);
2389 if (l->block_ref_from->is_superblock &&
2390 state->latest_superblock->dev_bytenr ==
2391 l->block_ref_from->dev_bytenr &&
2392 state->latest_superblock->dev_state->bdev ==
2393 l->block_ref_from->dev_state->bdev)
2394 return 1;
2395 else if (btrfsic_is_block_ref_by_superblock(state,
2396 l->block_ref_from,
2397 recursion_level +
2398 1))
2399 return 1;
2400 }
2401
2402 return 0;
2403}
2404
2405static void btrfsic_print_add_link(const struct btrfsic_state *state,
2406 const struct btrfsic_block_link *l)
2407{
2408 pr_info("Add %u* link from %c @%llu (%s/%llu/%d) to %c @%llu (%s/%llu/%d).\n",
2409 l->ref_cnt,
2410 btrfsic_get_block_type(state, l->block_ref_from),
2411 l->block_ref_from->logical_bytenr,
2412 l->block_ref_from->dev_state->name,
2413 l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num,
2414 btrfsic_get_block_type(state, l->block_ref_to),
2415 l->block_ref_to->logical_bytenr,
2416 l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr,
2417 l->block_ref_to->mirror_num);
2418}
2419
2420static void btrfsic_print_rem_link(const struct btrfsic_state *state,
2421 const struct btrfsic_block_link *l)
2422{
2423 pr_info("Rem %u* link from %c @%llu (%s/%llu/%d) to %c @%llu (%s/%llu/%d).\n",
2424 l->ref_cnt,
2425 btrfsic_get_block_type(state, l->block_ref_from),
2426 l->block_ref_from->logical_bytenr,
2427 l->block_ref_from->dev_state->name,
2428 l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num,
2429 btrfsic_get_block_type(state, l->block_ref_to),
2430 l->block_ref_to->logical_bytenr,
2431 l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr,
2432 l->block_ref_to->mirror_num);
2433}
2434
2435static char btrfsic_get_block_type(const struct btrfsic_state *state,
2436 const struct btrfsic_block *block)
2437{
2438 if (block->is_superblock &&
2439 state->latest_superblock->dev_bytenr == block->dev_bytenr &&
2440 state->latest_superblock->dev_state->bdev == block->dev_state->bdev)
2441 return 'S';
2442 else if (block->is_superblock)
2443 return 's';
2444 else if (block->is_metadata)
2445 return 'M';
2446 else
2447 return 'D';
2448}
2449
2450static void btrfsic_dump_tree(const struct btrfsic_state *state)
2451{
2452 btrfsic_dump_tree_sub(state, state->latest_superblock, 0);
2453}
2454
2455static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
2456 const struct btrfsic_block *block,
2457 int indent_level)
2458{
2459 const struct btrfsic_block_link *l;
2460 int indent_add;
2461 static char buf[80];
2462 int cursor_position;
2463
2464 /*
2465 * Should better fill an on-stack buffer with a complete line and
2466 * dump it at once when it is time to print a newline character.
2467 */
2468
2469 /*
2470 * This algorithm is recursive because the amount of used stack space
2471 * is very small and the max recursion depth is limited.
2472 */
2473 indent_add = sprintf(buf, "%c-%llu(%s/%llu/%u)",
2474 btrfsic_get_block_type(state, block),
2475 block->logical_bytenr, block->dev_state->name,
2476 block->dev_bytenr, block->mirror_num);
2477 if (indent_level + indent_add > BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
2478 printk("[...]\n");
2479 return;
2480 }
2481 printk(buf);
2482 indent_level += indent_add;
2483 if (list_empty(&block->ref_to_list)) {
2484 printk("\n");
2485 return;
2486 }
2487 if (block->mirror_num > 1 &&
2488 !(state->print_mask & BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS)) {
2489 printk(" [...]\n");
2490 return;
2491 }
2492
2493 cursor_position = indent_level;
2494 list_for_each_entry(l, &block->ref_to_list, node_ref_to) {
2495 while (cursor_position < indent_level) {
2496 printk(" ");
2497 cursor_position++;
2498 }
2499 if (l->ref_cnt > 1)
2500 indent_add = sprintf(buf, " %d*--> ", l->ref_cnt);
2501 else
2502 indent_add = sprintf(buf, " --> ");
2503 if (indent_level + indent_add >
2504 BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
2505 printk("[...]\n");
2506 cursor_position = 0;
2507 continue;
2508 }
2509
2510 printk(buf);
2511
2512 btrfsic_dump_tree_sub(state, l->block_ref_to,
2513 indent_level + indent_add);
2514 cursor_position = 0;
2515 }
2516}
2517
2518static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
2519 struct btrfsic_state *state,
2520 struct btrfsic_block_data_ctx *next_block_ctx,
2521 struct btrfsic_block *next_block,
2522 struct btrfsic_block *from_block,
2523 u64 parent_generation)
2524{
2525 struct btrfsic_block_link *l;
2526
2527 l = btrfsic_block_link_hashtable_lookup(next_block_ctx->dev->bdev,
2528 next_block_ctx->dev_bytenr,
2529 from_block->dev_state->bdev,
2530 from_block->dev_bytenr,
2531 &state->block_link_hashtable);
2532 if (NULL == l) {
2533 l = btrfsic_block_link_alloc();
2534 if (!l)
2535 return NULL;
2536
2537 l->block_ref_to = next_block;
2538 l->block_ref_from = from_block;
2539 l->ref_cnt = 1;
2540 l->parent_generation = parent_generation;
2541
2542 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2543 btrfsic_print_add_link(state, l);
2544
2545 list_add(&l->node_ref_to, &from_block->ref_to_list);
2546 list_add(&l->node_ref_from, &next_block->ref_from_list);
2547
2548 btrfsic_block_link_hashtable_add(l,
2549 &state->block_link_hashtable);
2550 } else {
2551 l->ref_cnt++;
2552 l->parent_generation = parent_generation;
2553 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2554 btrfsic_print_add_link(state, l);
2555 }
2556
2557 return l;
2558}
2559
2560static struct btrfsic_block *btrfsic_block_lookup_or_add(
2561 struct btrfsic_state *state,
2562 struct btrfsic_block_data_ctx *block_ctx,
2563 const char *additional_string,
2564 int is_metadata,
2565 int is_iodone,
2566 int never_written,
2567 int mirror_num,
2568 int *was_created)
2569{
2570 struct btrfsic_block *block;
2571
2572 block = btrfsic_block_hashtable_lookup(block_ctx->dev->bdev,
2573 block_ctx->dev_bytenr,
2574 &state->block_hashtable);
2575 if (NULL == block) {
2576 struct btrfsic_dev_state *dev_state;
2577
2578 block = btrfsic_block_alloc();
2579 if (!block)
2580 return NULL;
2581
2582 dev_state = btrfsic_dev_state_lookup(block_ctx->dev->bdev->bd_dev);
2583 if (NULL == dev_state) {
2584 pr_info("btrfsic: error, lookup dev_state failed!\n");
2585 btrfsic_block_free(block);
2586 return NULL;
2587 }
2588 block->dev_state = dev_state;
2589 block->dev_bytenr = block_ctx->dev_bytenr;
2590 block->logical_bytenr = block_ctx->start;
2591 block->is_metadata = is_metadata;
2592 block->is_iodone = is_iodone;
2593 block->never_written = never_written;
2594 block->mirror_num = mirror_num;
2595 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2596 pr_info("New %s%c-block @%llu (%s/%llu/%d)\n",
2597 additional_string,
2598 btrfsic_get_block_type(state, block),
2599 block->logical_bytenr, dev_state->name,
2600 block->dev_bytenr, mirror_num);
2601 list_add(&block->all_blocks_node, &state->all_blocks_list);
2602 btrfsic_block_hashtable_add(block, &state->block_hashtable);
2603 if (NULL != was_created)
2604 *was_created = 1;
2605 } else {
2606 if (NULL != was_created)
2607 *was_created = 0;
2608 }
2609
2610 return block;
2611}
2612
2613static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
2614 u64 bytenr,
2615 struct btrfsic_dev_state *dev_state,
2616 u64 dev_bytenr)
2617{
2618 struct btrfs_fs_info *fs_info = state->fs_info;
2619 struct btrfsic_block_data_ctx block_ctx;
2620 int num_copies;
2621 int mirror_num;
2622 int match = 0;
2623 int ret;
2624
2625 num_copies = btrfs_num_copies(fs_info, bytenr, state->metablock_size);
2626
2627 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2628 ret = btrfsic_map_block(state, bytenr, state->metablock_size,
2629 &block_ctx, mirror_num);
2630 if (ret) {
2631 pr_info("btrfsic: btrfsic_map_block(logical @%llu, mirror %d) failed!\n",
2632 bytenr, mirror_num);
2633 continue;
2634 }
2635
2636 if (dev_state->bdev == block_ctx.dev->bdev &&
2637 dev_bytenr == block_ctx.dev_bytenr) {
2638 match++;
2639 btrfsic_release_block_ctx(&block_ctx);
2640 break;
2641 }
2642 btrfsic_release_block_ctx(&block_ctx);
2643 }
2644
2645 if (WARN_ON(!match)) {
2646 pr_info("btrfs: attempt to write M-block which contains logical bytenr that doesn't map to dev+physical bytenr of submit_bio, buffer->log_bytenr=%llu, submit_bio(bdev=%s, phys_bytenr=%llu)!\n",
2647 bytenr, dev_state->name, dev_bytenr);
2648 for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
2649 ret = btrfsic_map_block(state, bytenr,
2650 state->metablock_size,
2651 &block_ctx, mirror_num);
2652 if (ret)
2653 continue;
2654
2655 pr_info("Read logical bytenr @%llu maps to (%s/%llu/%d)\n",
2656 bytenr, block_ctx.dev->name,
2657 block_ctx.dev_bytenr, mirror_num);
2658 }
2659 }
2660}
2661
2662static struct btrfsic_dev_state *btrfsic_dev_state_lookup(dev_t dev)
2663{
2664 return btrfsic_dev_state_hashtable_lookup(dev,
2665 &btrfsic_dev_state_hashtable);
2666}
2667
2668static void __btrfsic_submit_bio(struct bio *bio)
2669{
2670 struct btrfsic_dev_state *dev_state;
2671
2672 if (!btrfsic_is_initialized)
2673 return;
2674
2675 mutex_lock(&btrfsic_mutex);
2676 /* since btrfsic_submit_bio() is also called before
2677 * btrfsic_mount(), this might return NULL */
2678 dev_state = btrfsic_dev_state_lookup(bio->bi_bdev->bd_dev);
2679 if (NULL != dev_state &&
2680 (bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) {
2681 int i = 0;
2682 u64 dev_bytenr;
2683 u64 cur_bytenr;
2684 struct bio_vec bvec;
2685 struct bvec_iter iter;
2686 int bio_is_patched;
2687 char **mapped_datav;
2688 unsigned int segs = bio_segments(bio);
2689
2690 dev_bytenr = 512 * bio->bi_iter.bi_sector;
2691 bio_is_patched = 0;
2692 if (dev_state->state->print_mask &
2693 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2694 pr_info("submit_bio(rw=%d,0x%x, bi_vcnt=%u, bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n",
2695 bio_op(bio), bio->bi_opf, segs,
2696 bio->bi_iter.bi_sector, dev_bytenr, bio->bi_bdev);
2697
2698 mapped_datav = kmalloc_array(segs,
2699 sizeof(*mapped_datav), GFP_NOFS);
2700 if (!mapped_datav)
2701 goto leave;
2702 cur_bytenr = dev_bytenr;
2703
2704 bio_for_each_segment(bvec, bio, iter) {
2705 BUG_ON(bvec.bv_len != PAGE_SIZE);
2706 mapped_datav[i] = kmap_local_page(bvec.bv_page);
2707 i++;
2708
2709 if (dev_state->state->print_mask &
2710 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE)
2711 pr_info("#%u: bytenr=%llu, len=%u, offset=%u\n",
2712 i, cur_bytenr, bvec.bv_len, bvec.bv_offset);
2713 cur_bytenr += bvec.bv_len;
2714 }
2715 btrfsic_process_written_block(dev_state, dev_bytenr,
2716 mapped_datav, segs,
2717 bio, &bio_is_patched,
2718 bio->bi_opf);
2719 /* Unmap in reverse order */
2720 for (--i; i >= 0; i--)
2721 kunmap_local(mapped_datav[i]);
2722 kfree(mapped_datav);
2723 } else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) {
2724 if (dev_state->state->print_mask &
2725 BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
2726 pr_info("submit_bio(rw=%d,0x%x FLUSH, bdev=%p)\n",
2727 bio_op(bio), bio->bi_opf, bio->bi_bdev);
2728 if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
2729 if ((dev_state->state->print_mask &
2730 (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
2731 BTRFSIC_PRINT_MASK_VERBOSE)))
2732 pr_info("btrfsic_submit_bio(%s) with FLUSH but dummy block already in use (ignored)!\n",
2733 dev_state->name);
2734 } else {
2735 struct btrfsic_block *const block =
2736 &dev_state->dummy_block_for_bio_bh_flush;
2737
2738 block->is_iodone = 0;
2739 block->never_written = 0;
2740 block->iodone_w_error = 0;
2741 block->flush_gen = dev_state->last_flush_gen + 1;
2742 block->submit_bio_bh_rw = bio->bi_opf;
2743 block->orig_bio_private = bio->bi_private;
2744 block->orig_bio_end_io = bio->bi_end_io;
2745 block->next_in_same_bio = NULL;
2746 bio->bi_private = block;
2747 bio->bi_end_io = btrfsic_bio_end_io;
2748 }
2749 }
2750leave:
2751 mutex_unlock(&btrfsic_mutex);
2752}
2753
2754void btrfsic_submit_bio(struct bio *bio)
2755{
2756 __btrfsic_submit_bio(bio);
2757 submit_bio(bio);
2758}
2759
2760int btrfsic_submit_bio_wait(struct bio *bio)
2761{
2762 __btrfsic_submit_bio(bio);
2763 return submit_bio_wait(bio);
2764}
2765
2766int btrfsic_mount(struct btrfs_fs_info *fs_info,
2767 struct btrfs_fs_devices *fs_devices,
2768 int including_extent_data, u32 print_mask)
2769{
2770 int ret;
2771 struct btrfsic_state *state;
2772 struct list_head *dev_head = &fs_devices->devices;
2773 struct btrfs_device *device;
2774
2775 if (!PAGE_ALIGNED(fs_info->nodesize)) {
2776 pr_info("btrfsic: cannot handle nodesize %d not being a multiple of PAGE_SIZE %ld!\n",
2777 fs_info->nodesize, PAGE_SIZE);
2778 return -1;
2779 }
2780 if (!PAGE_ALIGNED(fs_info->sectorsize)) {
2781 pr_info("btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_SIZE %ld!\n",
2782 fs_info->sectorsize, PAGE_SIZE);
2783 return -1;
2784 }
2785 state = kvzalloc(sizeof(*state), GFP_KERNEL);
2786 if (!state)
2787 return -ENOMEM;
2788
2789 if (!btrfsic_is_initialized) {
2790 mutex_init(&btrfsic_mutex);
2791 btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable);
2792 btrfsic_is_initialized = 1;
2793 }
2794 mutex_lock(&btrfsic_mutex);
2795 state->fs_info = fs_info;
2796 state->print_mask = print_mask;
2797 state->include_extent_data = including_extent_data;
2798 state->metablock_size = fs_info->nodesize;
2799 state->datablock_size = fs_info->sectorsize;
2800 INIT_LIST_HEAD(&state->all_blocks_list);
2801 btrfsic_block_hashtable_init(&state->block_hashtable);
2802 btrfsic_block_link_hashtable_init(&state->block_link_hashtable);
2803 state->max_superblock_generation = 0;
2804 state->latest_superblock = NULL;
2805
2806 list_for_each_entry(device, dev_head, dev_list) {
2807 struct btrfsic_dev_state *ds;
2808 const char *p;
2809
2810 if (!device->bdev || !device->name)
2811 continue;
2812
2813 ds = btrfsic_dev_state_alloc();
2814 if (NULL == ds) {
2815 mutex_unlock(&btrfsic_mutex);
2816 return -ENOMEM;
2817 }
2818 ds->bdev = device->bdev;
2819 ds->state = state;
2820 bdevname(ds->bdev, ds->name);
2821 ds->name[BDEVNAME_SIZE - 1] = '\0';
2822 p = kbasename(ds->name);
2823 strlcpy(ds->name, p, sizeof(ds->name));
2824 btrfsic_dev_state_hashtable_add(ds,
2825 &btrfsic_dev_state_hashtable);
2826 }
2827
2828 ret = btrfsic_process_superblock(state, fs_devices);
2829 if (0 != ret) {
2830 mutex_unlock(&btrfsic_mutex);
2831 btrfsic_unmount(fs_devices);
2832 return ret;
2833 }
2834
2835 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_DATABASE)
2836 btrfsic_dump_database(state);
2837 if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_TREE)
2838 btrfsic_dump_tree(state);
2839
2840 mutex_unlock(&btrfsic_mutex);
2841 return 0;
2842}
2843
2844void btrfsic_unmount(struct btrfs_fs_devices *fs_devices)
2845{
2846 struct btrfsic_block *b_all, *tmp_all;
2847 struct btrfsic_state *state;
2848 struct list_head *dev_head = &fs_devices->devices;
2849 struct btrfs_device *device;
2850
2851 if (!btrfsic_is_initialized)
2852 return;
2853
2854 mutex_lock(&btrfsic_mutex);
2855
2856 state = NULL;
2857 list_for_each_entry(device, dev_head, dev_list) {
2858 struct btrfsic_dev_state *ds;
2859
2860 if (!device->bdev || !device->name)
2861 continue;
2862
2863 ds = btrfsic_dev_state_hashtable_lookup(
2864 device->bdev->bd_dev,
2865 &btrfsic_dev_state_hashtable);
2866 if (NULL != ds) {
2867 state = ds->state;
2868 btrfsic_dev_state_hashtable_remove(ds);
2869 btrfsic_dev_state_free(ds);
2870 }
2871 }
2872
2873 if (NULL == state) {
2874 pr_info("btrfsic: error, cannot find state information on umount!\n");
2875 mutex_unlock(&btrfsic_mutex);
2876 return;
2877 }
2878
2879 /*
2880 * Don't care about keeping the lists' state up to date,
2881 * just free all memory that was allocated dynamically.
2882 * Free the blocks and the block_links.
2883 */
2884 list_for_each_entry_safe(b_all, tmp_all, &state->all_blocks_list,
2885 all_blocks_node) {
2886 struct btrfsic_block_link *l, *tmp;
2887
2888 list_for_each_entry_safe(l, tmp, &b_all->ref_to_list,
2889 node_ref_to) {
2890 if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
2891 btrfsic_print_rem_link(state, l);
2892
2893 l->ref_cnt--;
2894 if (0 == l->ref_cnt)
2895 btrfsic_block_link_free(l);
2896 }
2897
2898 if (b_all->is_iodone || b_all->never_written)
2899 btrfsic_block_free(b_all);
2900 else
2901 pr_info("btrfs: attempt to free %c-block @%llu (%s/%llu/%d) on umount which is not yet iodone!\n",
2902 btrfsic_get_block_type(state, b_all),
2903 b_all->logical_bytenr, b_all->dev_state->name,
2904 b_all->dev_bytenr, b_all->mirror_num);
2905 }
2906
2907 mutex_unlock(&btrfsic_mutex);
2908
2909 kvfree(state);
2910}