]>
Commit | Line | Data |
---|---|---|
5db02760 SB |
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 | |
62856a9b SB |
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. | |
5db02760 SB |
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. | |
56d140f5 SB |
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 | |
5db02760 SB |
89 | */ |
90 | ||
91 | #include <linux/sched.h> | |
92 | #include <linux/slab.h> | |
93 | #include <linux/buffer_head.h> | |
94 | #include <linux/mutex.h> | |
5db02760 SB |
95 | #include <linux/genhd.h> |
96 | #include <linux/blkdev.h> | |
97 | #include "ctree.h" | |
98 | #include "disk-io.h" | |
0b947aff | 99 | #include "hash.h" |
5db02760 SB |
100 | #include "transaction.h" |
101 | #include "extent_io.h" | |
5db02760 SB |
102 | #include "volumes.h" |
103 | #include "print-tree.h" | |
104 | #include "locking.h" | |
105 | #include "check-integrity.h" | |
606686ee | 106 | #include "rcu-string.h" |
5db02760 SB |
107 | |
108 | #define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000 | |
109 | #define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000 | |
110 | #define BTRFSIC_DEV2STATE_HASHTABLE_SIZE 0x100 | |
111 | #define BTRFSIC_BLOCK_MAGIC_NUMBER 0x14491051 | |
112 | #define BTRFSIC_BLOCK_LINK_MAGIC_NUMBER 0x11070807 | |
113 | #define BTRFSIC_DEV2STATE_MAGIC_NUMBER 0x20111530 | |
114 | #define BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER 20111300 | |
115 | #define BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL (200 - 6) /* in characters, | |
116 | * excluding " [...]" */ | |
5db02760 SB |
117 | #define BTRFSIC_GENERATION_UNKNOWN ((u64)-1) |
118 | ||
119 | /* | |
120 | * The definition of the bitmask fields for the print_mask. | |
121 | * They are specified with the mount option check_integrity_print_mask. | |
122 | */ | |
123 | #define BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE 0x00000001 | |
124 | #define BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION 0x00000002 | |
125 | #define BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE 0x00000004 | |
126 | #define BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE 0x00000008 | |
127 | #define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH 0x00000010 | |
128 | #define BTRFSIC_PRINT_MASK_END_IO_BIO_BH 0x00000020 | |
129 | #define BTRFSIC_PRINT_MASK_VERBOSE 0x00000040 | |
130 | #define BTRFSIC_PRINT_MASK_VERY_VERBOSE 0x00000080 | |
131 | #define BTRFSIC_PRINT_MASK_INITIAL_TREE 0x00000100 | |
132 | #define BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES 0x00000200 | |
133 | #define BTRFSIC_PRINT_MASK_INITIAL_DATABASE 0x00000400 | |
134 | #define BTRFSIC_PRINT_MASK_NUM_COPIES 0x00000800 | |
135 | #define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS 0x00001000 | |
56d140f5 | 136 | #define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE 0x00002000 |
5db02760 SB |
137 | |
138 | struct btrfsic_dev_state; | |
139 | struct btrfsic_state; | |
140 | ||
141 | struct btrfsic_block { | |
142 | u32 magic_num; /* only used for debug purposes */ | |
143 | unsigned int is_metadata:1; /* if it is meta-data, not data-data */ | |
144 | unsigned int is_superblock:1; /* if it is one of the superblocks */ | |
145 | unsigned int is_iodone:1; /* if is done by lower subsystem */ | |
146 | unsigned int iodone_w_error:1; /* error was indicated to endio */ | |
147 | unsigned int never_written:1; /* block was added because it was | |
148 | * referenced, not because it was | |
149 | * written */ | |
cb3806ec | 150 | unsigned int mirror_num; /* large enough to hold |
5db02760 SB |
151 | * BTRFS_SUPER_MIRROR_MAX */ |
152 | struct btrfsic_dev_state *dev_state; | |
153 | u64 dev_bytenr; /* key, physical byte num on disk */ | |
154 | u64 logical_bytenr; /* logical byte num on disk */ | |
155 | u64 generation; | |
156 | struct btrfs_disk_key disk_key; /* extra info to print in case of | |
157 | * issues, will not always be correct */ | |
158 | struct list_head collision_resolving_node; /* list node */ | |
159 | struct list_head all_blocks_node; /* list node */ | |
160 | ||
161 | /* the following two lists contain block_link items */ | |
162 | struct list_head ref_to_list; /* list */ | |
163 | struct list_head ref_from_list; /* list */ | |
164 | struct btrfsic_block *next_in_same_bio; | |
165 | void *orig_bio_bh_private; | |
166 | union { | |
167 | bio_end_io_t *bio; | |
168 | bh_end_io_t *bh; | |
169 | } orig_bio_bh_end_io; | |
170 | int submit_bio_bh_rw; | |
171 | u64 flush_gen; /* only valid if !never_written */ | |
172 | }; | |
173 | ||
174 | /* | |
175 | * Elements of this type are allocated dynamically and required because | |
176 | * each block object can refer to and can be ref from multiple blocks. | |
177 | * The key to lookup them in the hashtable is the dev_bytenr of | |
178 | * the block ref to plus the one from the block refered from. | |
179 | * The fact that they are searchable via a hashtable and that a | |
180 | * ref_cnt is maintained is not required for the btrfs integrity | |
181 | * check algorithm itself, it is only used to make the output more | |
182 | * beautiful in case that an error is detected (an error is defined | |
183 | * as a write operation to a block while that block is still referenced). | |
184 | */ | |
185 | struct btrfsic_block_link { | |
186 | u32 magic_num; /* only used for debug purposes */ | |
187 | u32 ref_cnt; | |
188 | struct list_head node_ref_to; /* list node */ | |
189 | struct list_head node_ref_from; /* list node */ | |
190 | struct list_head collision_resolving_node; /* list node */ | |
191 | struct btrfsic_block *block_ref_to; | |
192 | struct btrfsic_block *block_ref_from; | |
193 | u64 parent_generation; | |
194 | }; | |
195 | ||
196 | struct btrfsic_dev_state { | |
197 | u32 magic_num; /* only used for debug purposes */ | |
198 | struct block_device *bdev; | |
199 | struct btrfsic_state *state; | |
200 | struct list_head collision_resolving_node; /* list node */ | |
201 | struct btrfsic_block dummy_block_for_bio_bh_flush; | |
202 | u64 last_flush_gen; | |
203 | char name[BDEVNAME_SIZE]; | |
204 | }; | |
205 | ||
206 | struct btrfsic_block_hashtable { | |
207 | struct list_head table[BTRFSIC_BLOCK_HASHTABLE_SIZE]; | |
208 | }; | |
209 | ||
210 | struct btrfsic_block_link_hashtable { | |
211 | struct list_head table[BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE]; | |
212 | }; | |
213 | ||
214 | struct btrfsic_dev_state_hashtable { | |
215 | struct list_head table[BTRFSIC_DEV2STATE_HASHTABLE_SIZE]; | |
216 | }; | |
217 | ||
218 | struct btrfsic_block_data_ctx { | |
219 | u64 start; /* virtual bytenr */ | |
220 | u64 dev_bytenr; /* physical bytenr on device */ | |
221 | u32 len; | |
222 | struct btrfsic_dev_state *dev; | |
e06baab4 SB |
223 | char **datav; |
224 | struct page **pagev; | |
225 | void *mem_to_free; | |
5db02760 SB |
226 | }; |
227 | ||
228 | /* This structure is used to implement recursion without occupying | |
229 | * any stack space, refer to btrfsic_process_metablock() */ | |
230 | struct btrfsic_stack_frame { | |
231 | u32 magic; | |
232 | u32 nr; | |
233 | int error; | |
234 | int i; | |
235 | int limit_nesting; | |
236 | int num_copies; | |
237 | int mirror_num; | |
238 | struct btrfsic_block *block; | |
239 | struct btrfsic_block_data_ctx *block_ctx; | |
240 | struct btrfsic_block *next_block; | |
241 | struct btrfsic_block_data_ctx next_block_ctx; | |
242 | struct btrfs_header *hdr; | |
243 | struct btrfsic_stack_frame *prev; | |
244 | }; | |
245 | ||
246 | /* Some state per mounted filesystem */ | |
247 | struct btrfsic_state { | |
248 | u32 print_mask; | |
249 | int include_extent_data; | |
250 | int csum_size; | |
251 | struct list_head all_blocks_list; | |
252 | struct btrfsic_block_hashtable block_hashtable; | |
253 | struct btrfsic_block_link_hashtable block_link_hashtable; | |
254 | struct btrfs_root *root; | |
255 | u64 max_superblock_generation; | |
256 | struct btrfsic_block *latest_superblock; | |
e06baab4 SB |
257 | u32 metablock_size; |
258 | u32 datablock_size; | |
5db02760 SB |
259 | }; |
260 | ||
261 | static void btrfsic_block_init(struct btrfsic_block *b); | |
262 | static struct btrfsic_block *btrfsic_block_alloc(void); | |
263 | static void btrfsic_block_free(struct btrfsic_block *b); | |
264 | static void btrfsic_block_link_init(struct btrfsic_block_link *n); | |
265 | static struct btrfsic_block_link *btrfsic_block_link_alloc(void); | |
266 | static void btrfsic_block_link_free(struct btrfsic_block_link *n); | |
267 | static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds); | |
268 | static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void); | |
269 | static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds); | |
270 | static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h); | |
271 | static void btrfsic_block_hashtable_add(struct btrfsic_block *b, | |
272 | struct btrfsic_block_hashtable *h); | |
273 | static void btrfsic_block_hashtable_remove(struct btrfsic_block *b); | |
274 | static struct btrfsic_block *btrfsic_block_hashtable_lookup( | |
275 | struct block_device *bdev, | |
276 | u64 dev_bytenr, | |
277 | struct btrfsic_block_hashtable *h); | |
278 | static void btrfsic_block_link_hashtable_init( | |
279 | struct btrfsic_block_link_hashtable *h); | |
280 | static void btrfsic_block_link_hashtable_add( | |
281 | struct btrfsic_block_link *l, | |
282 | struct btrfsic_block_link_hashtable *h); | |
283 | static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l); | |
284 | static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup( | |
285 | struct block_device *bdev_ref_to, | |
286 | u64 dev_bytenr_ref_to, | |
287 | struct block_device *bdev_ref_from, | |
288 | u64 dev_bytenr_ref_from, | |
289 | struct btrfsic_block_link_hashtable *h); | |
290 | static void btrfsic_dev_state_hashtable_init( | |
291 | struct btrfsic_dev_state_hashtable *h); | |
292 | static void btrfsic_dev_state_hashtable_add( | |
293 | struct btrfsic_dev_state *ds, | |
294 | struct btrfsic_dev_state_hashtable *h); | |
295 | static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds); | |
296 | static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup( | |
297 | struct block_device *bdev, | |
298 | struct btrfsic_dev_state_hashtable *h); | |
299 | static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void); | |
300 | static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf); | |
301 | static int btrfsic_process_superblock(struct btrfsic_state *state, | |
302 | struct btrfs_fs_devices *fs_devices); | |
303 | static int btrfsic_process_metablock(struct btrfsic_state *state, | |
304 | struct btrfsic_block *block, | |
305 | struct btrfsic_block_data_ctx *block_ctx, | |
5db02760 | 306 | int limit_nesting, int force_iodone_flag); |
e06baab4 SB |
307 | static void btrfsic_read_from_block_data( |
308 | struct btrfsic_block_data_ctx *block_ctx, | |
309 | void *dst, u32 offset, size_t len); | |
5db02760 SB |
310 | static int btrfsic_create_link_to_next_block( |
311 | struct btrfsic_state *state, | |
312 | struct btrfsic_block *block, | |
313 | struct btrfsic_block_data_ctx | |
314 | *block_ctx, u64 next_bytenr, | |
315 | int limit_nesting, | |
316 | struct btrfsic_block_data_ctx *next_block_ctx, | |
317 | struct btrfsic_block **next_blockp, | |
318 | int force_iodone_flag, | |
319 | int *num_copiesp, int *mirror_nump, | |
320 | struct btrfs_disk_key *disk_key, | |
321 | u64 parent_generation); | |
322 | static int btrfsic_handle_extent_data(struct btrfsic_state *state, | |
323 | struct btrfsic_block *block, | |
324 | struct btrfsic_block_data_ctx *block_ctx, | |
325 | u32 item_offset, int force_iodone_flag); | |
326 | static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len, | |
327 | struct btrfsic_block_data_ctx *block_ctx_out, | |
328 | int mirror_num); | |
329 | static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr, | |
330 | u32 len, struct block_device *bdev, | |
331 | struct btrfsic_block_data_ctx *block_ctx_out); | |
332 | static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx); | |
333 | static int btrfsic_read_block(struct btrfsic_state *state, | |
334 | struct btrfsic_block_data_ctx *block_ctx); | |
335 | static void btrfsic_dump_database(struct btrfsic_state *state); | |
336 | static int btrfsic_test_for_metadata(struct btrfsic_state *state, | |
e06baab4 | 337 | char **datav, unsigned int num_pages); |
5db02760 | 338 | static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state, |
e06baab4 SB |
339 | u64 dev_bytenr, char **mapped_datav, |
340 | unsigned int num_pages, | |
341 | struct bio *bio, int *bio_is_patched, | |
5db02760 SB |
342 | struct buffer_head *bh, |
343 | int submit_bio_bh_rw); | |
344 | static int btrfsic_process_written_superblock( | |
345 | struct btrfsic_state *state, | |
346 | struct btrfsic_block *const block, | |
347 | struct btrfs_super_block *const super_hdr); | |
348 | static void btrfsic_bio_end_io(struct bio *bp, int bio_error_status); | |
349 | static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate); | |
350 | static int btrfsic_is_block_ref_by_superblock(const struct btrfsic_state *state, | |
351 | const struct btrfsic_block *block, | |
352 | int recursion_level); | |
353 | static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state, | |
354 | struct btrfsic_block *const block, | |
355 | int recursion_level); | |
356 | static void btrfsic_print_add_link(const struct btrfsic_state *state, | |
357 | const struct btrfsic_block_link *l); | |
358 | static void btrfsic_print_rem_link(const struct btrfsic_state *state, | |
359 | const struct btrfsic_block_link *l); | |
360 | static char btrfsic_get_block_type(const struct btrfsic_state *state, | |
361 | const struct btrfsic_block *block); | |
362 | static void btrfsic_dump_tree(const struct btrfsic_state *state); | |
363 | static void btrfsic_dump_tree_sub(const struct btrfsic_state *state, | |
364 | const struct btrfsic_block *block, | |
365 | int indent_level); | |
366 | static 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); | |
372 | static 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); | |
381 | static 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); | |
388 | static struct btrfsic_dev_state *btrfsic_dev_state_lookup( | |
389 | struct block_device *bdev); | |
390 | static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state, | |
391 | u64 bytenr, | |
392 | struct btrfsic_dev_state *dev_state, | |
e06baab4 | 393 | u64 dev_bytenr); |
5db02760 SB |
394 | |
395 | static struct mutex btrfsic_mutex; | |
396 | static int btrfsic_is_initialized; | |
397 | static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable; | |
398 | ||
399 | ||
400 | static 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 | ||
427 | static 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 | ||
438 | static 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 | ||
444 | static 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 | ||
455 | static 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 | ||
466 | static 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 | ||
472 | static 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 | ||
485 | static 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 | ||
496 | static 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 | ||
503 | static 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 | ||
511 | static 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 | ||
522 | static void btrfsic_block_hashtable_remove(struct btrfsic_block *b) | |
523 | { | |
524 | list_del(&b->collision_resolving_node); | |
525 | } | |
526 | ||
527 | static 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 list_head *elem; | |
537 | ||
538 | list_for_each(elem, h->table + hashval) { | |
539 | struct btrfsic_block *const b = | |
540 | list_entry(elem, struct btrfsic_block, | |
541 | collision_resolving_node); | |
542 | ||
543 | if (b->dev_state->bdev == bdev && b->dev_bytenr == dev_bytenr) | |
544 | return b; | |
545 | } | |
546 | ||
547 | return NULL; | |
548 | } | |
549 | ||
550 | static void btrfsic_block_link_hashtable_init( | |
551 | struct btrfsic_block_link_hashtable *h) | |
552 | { | |
553 | int i; | |
554 | ||
555 | for (i = 0; i < BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE; i++) | |
556 | INIT_LIST_HEAD(h->table + i); | |
557 | } | |
558 | ||
559 | static void btrfsic_block_link_hashtable_add( | |
560 | struct btrfsic_block_link *l, | |
561 | struct btrfsic_block_link_hashtable *h) | |
562 | { | |
563 | const unsigned int hashval = | |
564 | (((unsigned int)(l->block_ref_to->dev_bytenr >> 16)) ^ | |
565 | ((unsigned int)(l->block_ref_from->dev_bytenr >> 16)) ^ | |
566 | ((unsigned int)((uintptr_t)l->block_ref_to->dev_state->bdev)) ^ | |
567 | ((unsigned int)((uintptr_t)l->block_ref_from->dev_state->bdev))) | |
568 | & (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1); | |
569 | ||
570 | BUG_ON(NULL == l->block_ref_to); | |
571 | BUG_ON(NULL == l->block_ref_from); | |
572 | list_add(&l->collision_resolving_node, h->table + hashval); | |
573 | } | |
574 | ||
575 | static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l) | |
576 | { | |
577 | list_del(&l->collision_resolving_node); | |
578 | } | |
579 | ||
580 | static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup( | |
581 | struct block_device *bdev_ref_to, | |
582 | u64 dev_bytenr_ref_to, | |
583 | struct block_device *bdev_ref_from, | |
584 | u64 dev_bytenr_ref_from, | |
585 | struct btrfsic_block_link_hashtable *h) | |
586 | { | |
587 | const unsigned int hashval = | |
588 | (((unsigned int)(dev_bytenr_ref_to >> 16)) ^ | |
589 | ((unsigned int)(dev_bytenr_ref_from >> 16)) ^ | |
590 | ((unsigned int)((uintptr_t)bdev_ref_to)) ^ | |
591 | ((unsigned int)((uintptr_t)bdev_ref_from))) & | |
592 | (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1); | |
593 | struct list_head *elem; | |
594 | ||
595 | list_for_each(elem, h->table + hashval) { | |
596 | struct btrfsic_block_link *const l = | |
597 | list_entry(elem, struct btrfsic_block_link, | |
598 | collision_resolving_node); | |
599 | ||
600 | BUG_ON(NULL == l->block_ref_to); | |
601 | BUG_ON(NULL == l->block_ref_from); | |
602 | if (l->block_ref_to->dev_state->bdev == bdev_ref_to && | |
603 | l->block_ref_to->dev_bytenr == dev_bytenr_ref_to && | |
604 | l->block_ref_from->dev_state->bdev == bdev_ref_from && | |
605 | l->block_ref_from->dev_bytenr == dev_bytenr_ref_from) | |
606 | return l; | |
607 | } | |
608 | ||
609 | return NULL; | |
610 | } | |
611 | ||
612 | static void btrfsic_dev_state_hashtable_init( | |
613 | struct btrfsic_dev_state_hashtable *h) | |
614 | { | |
615 | int i; | |
616 | ||
617 | for (i = 0; i < BTRFSIC_DEV2STATE_HASHTABLE_SIZE; i++) | |
618 | INIT_LIST_HEAD(h->table + i); | |
619 | } | |
620 | ||
621 | static void btrfsic_dev_state_hashtable_add( | |
622 | struct btrfsic_dev_state *ds, | |
623 | struct btrfsic_dev_state_hashtable *h) | |
624 | { | |
625 | const unsigned int hashval = | |
626 | (((unsigned int)((uintptr_t)ds->bdev)) & | |
627 | (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1)); | |
628 | ||
629 | list_add(&ds->collision_resolving_node, h->table + hashval); | |
630 | } | |
631 | ||
632 | static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds) | |
633 | { | |
634 | list_del(&ds->collision_resolving_node); | |
635 | } | |
636 | ||
637 | static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup( | |
638 | struct block_device *bdev, | |
639 | struct btrfsic_dev_state_hashtable *h) | |
640 | { | |
641 | const unsigned int hashval = | |
642 | (((unsigned int)((uintptr_t)bdev)) & | |
643 | (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1)); | |
644 | struct list_head *elem; | |
645 | ||
646 | list_for_each(elem, h->table + hashval) { | |
647 | struct btrfsic_dev_state *const ds = | |
648 | list_entry(elem, struct btrfsic_dev_state, | |
649 | collision_resolving_node); | |
650 | ||
651 | if (ds->bdev == bdev) | |
652 | return ds; | |
653 | } | |
654 | ||
655 | return NULL; | |
656 | } | |
657 | ||
658 | static int btrfsic_process_superblock(struct btrfsic_state *state, | |
659 | struct btrfs_fs_devices *fs_devices) | |
660 | { | |
e77266e4 | 661 | int ret = 0; |
5db02760 SB |
662 | struct btrfs_super_block *selected_super; |
663 | struct list_head *dev_head = &fs_devices->devices; | |
664 | struct btrfs_device *device; | |
665 | struct btrfsic_dev_state *selected_dev_state = NULL; | |
666 | int pass; | |
667 | ||
668 | BUG_ON(NULL == state); | |
e06baab4 | 669 | selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS); |
5db02760 SB |
670 | if (NULL == selected_super) { |
671 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
672 | return -1; | |
673 | } | |
674 | ||
675 | list_for_each_entry(device, dev_head, dev_list) { | |
676 | int i; | |
677 | struct btrfsic_dev_state *dev_state; | |
678 | ||
679 | if (!device->bdev || !device->name) | |
680 | continue; | |
681 | ||
682 | dev_state = btrfsic_dev_state_lookup(device->bdev); | |
683 | BUG_ON(NULL == dev_state); | |
684 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
685 | ret = btrfsic_process_superblock_dev_mirror( | |
686 | state, dev_state, device, i, | |
687 | &selected_dev_state, selected_super); | |
688 | if (0 != ret && 0 == i) { | |
689 | kfree(selected_super); | |
690 | return ret; | |
691 | } | |
692 | } | |
693 | } | |
694 | ||
695 | if (NULL == state->latest_superblock) { | |
696 | printk(KERN_INFO "btrfsic: no superblock found!\n"); | |
697 | kfree(selected_super); | |
698 | return -1; | |
699 | } | |
700 | ||
701 | state->csum_size = btrfs_super_csum_size(selected_super); | |
702 | ||
703 | for (pass = 0; pass < 3; pass++) { | |
704 | int num_copies; | |
705 | int mirror_num; | |
706 | u64 next_bytenr; | |
707 | ||
708 | switch (pass) { | |
709 | case 0: | |
710 | next_bytenr = btrfs_super_root(selected_super); | |
711 | if (state->print_mask & | |
712 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 713 | printk(KERN_INFO "root@%llu\n", next_bytenr); |
5db02760 SB |
714 | break; |
715 | case 1: | |
716 | next_bytenr = btrfs_super_chunk_root(selected_super); | |
717 | if (state->print_mask & | |
718 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 719 | printk(KERN_INFO "chunk@%llu\n", next_bytenr); |
5db02760 SB |
720 | break; |
721 | case 2: | |
722 | next_bytenr = btrfs_super_log_root(selected_super); | |
723 | if (0 == next_bytenr) | |
724 | continue; | |
725 | if (state->print_mask & | |
726 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 727 | printk(KERN_INFO "log@%llu\n", next_bytenr); |
5db02760 SB |
728 | break; |
729 | } | |
730 | ||
731 | num_copies = | |
5d964051 | 732 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 733 | next_bytenr, state->metablock_size); |
5db02760 SB |
734 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
735 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 736 | next_bytenr, num_copies); |
5db02760 SB |
737 | |
738 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { | |
739 | struct btrfsic_block *next_block; | |
740 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
741 | struct btrfsic_block_link *l; | |
5db02760 | 742 | |
e06baab4 SB |
743 | ret = btrfsic_map_block(state, next_bytenr, |
744 | state->metablock_size, | |
5db02760 SB |
745 | &tmp_next_block_ctx, |
746 | mirror_num); | |
747 | if (ret) { | |
748 | printk(KERN_INFO "btrfsic:" | |
749 | " btrfsic_map_block(root @%llu," | |
750 | " mirror %d) failed!\n", | |
c1c9ff7c | 751 | next_bytenr, mirror_num); |
5db02760 SB |
752 | kfree(selected_super); |
753 | return -1; | |
754 | } | |
755 | ||
756 | next_block = btrfsic_block_hashtable_lookup( | |
757 | tmp_next_block_ctx.dev->bdev, | |
758 | tmp_next_block_ctx.dev_bytenr, | |
759 | &state->block_hashtable); | |
760 | BUG_ON(NULL == next_block); | |
761 | ||
762 | l = btrfsic_block_link_hashtable_lookup( | |
763 | tmp_next_block_ctx.dev->bdev, | |
764 | tmp_next_block_ctx.dev_bytenr, | |
765 | state->latest_superblock->dev_state-> | |
766 | bdev, | |
767 | state->latest_superblock->dev_bytenr, | |
768 | &state->block_link_hashtable); | |
769 | BUG_ON(NULL == l); | |
770 | ||
771 | ret = btrfsic_read_block(state, &tmp_next_block_ctx); | |
e06baab4 | 772 | if (ret < (int)PAGE_CACHE_SIZE) { |
5db02760 SB |
773 | printk(KERN_INFO |
774 | "btrfsic: read @logical %llu failed!\n", | |
5db02760 SB |
775 | tmp_next_block_ctx.start); |
776 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
777 | kfree(selected_super); | |
778 | return -1; | |
779 | } | |
780 | ||
5db02760 SB |
781 | ret = btrfsic_process_metablock(state, |
782 | next_block, | |
783 | &tmp_next_block_ctx, | |
5db02760 SB |
784 | BTRFS_MAX_LEVEL + 3, 1); |
785 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
786 | } | |
787 | } | |
788 | ||
789 | kfree(selected_super); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | static int btrfsic_process_superblock_dev_mirror( | |
794 | struct btrfsic_state *state, | |
795 | struct btrfsic_dev_state *dev_state, | |
796 | struct btrfs_device *device, | |
797 | int superblock_mirror_num, | |
798 | struct btrfsic_dev_state **selected_dev_state, | |
799 | struct btrfs_super_block *selected_super) | |
800 | { | |
801 | struct btrfs_super_block *super_tmp; | |
802 | u64 dev_bytenr; | |
803 | struct buffer_head *bh; | |
804 | struct btrfsic_block *superblock_tmp; | |
805 | int pass; | |
806 | struct block_device *const superblock_bdev = device->bdev; | |
807 | ||
808 | /* super block bytenr is always the unmapped device bytenr */ | |
809 | dev_bytenr = btrfs_sb_offset(superblock_mirror_num); | |
e06baab4 SB |
810 | if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes) |
811 | return -1; | |
812 | bh = __bread(superblock_bdev, dev_bytenr / 4096, | |
813 | BTRFS_SUPER_INFO_SIZE); | |
5db02760 SB |
814 | if (NULL == bh) |
815 | return -1; | |
816 | super_tmp = (struct btrfs_super_block *) | |
817 | (bh->b_data + (dev_bytenr & 4095)); | |
818 | ||
819 | if (btrfs_super_bytenr(super_tmp) != dev_bytenr || | |
3cae210f | 820 | btrfs_super_magic(super_tmp) != BTRFS_MAGIC || |
e06baab4 SB |
821 | memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) || |
822 | btrfs_super_nodesize(super_tmp) != state->metablock_size || | |
823 | btrfs_super_leafsize(super_tmp) != state->metablock_size || | |
824 | btrfs_super_sectorsize(super_tmp) != state->datablock_size) { | |
5db02760 SB |
825 | brelse(bh); |
826 | return 0; | |
827 | } | |
828 | ||
829 | superblock_tmp = | |
830 | btrfsic_block_hashtable_lookup(superblock_bdev, | |
831 | dev_bytenr, | |
832 | &state->block_hashtable); | |
833 | if (NULL == superblock_tmp) { | |
834 | superblock_tmp = btrfsic_block_alloc(); | |
835 | if (NULL == superblock_tmp) { | |
836 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
837 | brelse(bh); | |
838 | return -1; | |
839 | } | |
840 | /* for superblock, only the dev_bytenr makes sense */ | |
841 | superblock_tmp->dev_bytenr = dev_bytenr; | |
842 | superblock_tmp->dev_state = dev_state; | |
843 | superblock_tmp->logical_bytenr = dev_bytenr; | |
844 | superblock_tmp->generation = btrfs_super_generation(super_tmp); | |
845 | superblock_tmp->is_metadata = 1; | |
846 | superblock_tmp->is_superblock = 1; | |
847 | superblock_tmp->is_iodone = 1; | |
848 | superblock_tmp->never_written = 0; | |
849 | superblock_tmp->mirror_num = 1 + superblock_mirror_num; | |
850 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
606686ee JB |
851 | printk_in_rcu(KERN_INFO "New initial S-block (bdev %p, %s)" |
852 | " @%llu (%s/%llu/%d)\n", | |
853 | superblock_bdev, | |
c1c9ff7c GU |
854 | rcu_str_deref(device->name), dev_bytenr, |
855 | dev_state->name, dev_bytenr, | |
606686ee | 856 | superblock_mirror_num); |
5db02760 SB |
857 | list_add(&superblock_tmp->all_blocks_node, |
858 | &state->all_blocks_list); | |
859 | btrfsic_block_hashtable_add(superblock_tmp, | |
860 | &state->block_hashtable); | |
861 | } | |
862 | ||
863 | /* select the one with the highest generation field */ | |
864 | if (btrfs_super_generation(super_tmp) > | |
865 | state->max_superblock_generation || | |
866 | 0 == state->max_superblock_generation) { | |
867 | memcpy(selected_super, super_tmp, sizeof(*selected_super)); | |
868 | *selected_dev_state = dev_state; | |
869 | state->max_superblock_generation = | |
870 | btrfs_super_generation(super_tmp); | |
871 | state->latest_superblock = superblock_tmp; | |
872 | } | |
873 | ||
874 | for (pass = 0; pass < 3; pass++) { | |
875 | u64 next_bytenr; | |
876 | int num_copies; | |
877 | int mirror_num; | |
878 | const char *additional_string = NULL; | |
879 | struct btrfs_disk_key tmp_disk_key; | |
880 | ||
881 | tmp_disk_key.type = BTRFS_ROOT_ITEM_KEY; | |
882 | tmp_disk_key.offset = 0; | |
883 | switch (pass) { | |
884 | case 0: | |
3cae210f QW |
885 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
886 | BTRFS_ROOT_TREE_OBJECTID); | |
5db02760 SB |
887 | additional_string = "initial root "; |
888 | next_bytenr = btrfs_super_root(super_tmp); | |
889 | break; | |
890 | case 1: | |
3cae210f QW |
891 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
892 | BTRFS_CHUNK_TREE_OBJECTID); | |
5db02760 SB |
893 | additional_string = "initial chunk "; |
894 | next_bytenr = btrfs_super_chunk_root(super_tmp); | |
895 | break; | |
896 | case 2: | |
3cae210f QW |
897 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
898 | BTRFS_TREE_LOG_OBJECTID); | |
5db02760 SB |
899 | additional_string = "initial log "; |
900 | next_bytenr = btrfs_super_log_root(super_tmp); | |
901 | if (0 == next_bytenr) | |
902 | continue; | |
903 | break; | |
904 | } | |
905 | ||
906 | num_copies = | |
5d964051 | 907 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 908 | next_bytenr, state->metablock_size); |
5db02760 SB |
909 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
910 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 911 | next_bytenr, num_copies); |
5db02760 SB |
912 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
913 | struct btrfsic_block *next_block; | |
914 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
915 | struct btrfsic_block_link *l; | |
916 | ||
e06baab4 SB |
917 | if (btrfsic_map_block(state, next_bytenr, |
918 | state->metablock_size, | |
5db02760 SB |
919 | &tmp_next_block_ctx, |
920 | mirror_num)) { | |
921 | printk(KERN_INFO "btrfsic: btrfsic_map_block(" | |
922 | "bytenr @%llu, mirror %d) failed!\n", | |
c1c9ff7c | 923 | next_bytenr, mirror_num); |
5db02760 SB |
924 | brelse(bh); |
925 | return -1; | |
926 | } | |
927 | ||
928 | next_block = btrfsic_block_lookup_or_add( | |
929 | state, &tmp_next_block_ctx, | |
930 | additional_string, 1, 1, 0, | |
931 | mirror_num, NULL); | |
932 | if (NULL == next_block) { | |
933 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
934 | brelse(bh); | |
935 | return -1; | |
936 | } | |
937 | ||
938 | next_block->disk_key = tmp_disk_key; | |
939 | next_block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
940 | l = btrfsic_block_link_lookup_or_add( | |
941 | state, &tmp_next_block_ctx, | |
942 | next_block, superblock_tmp, | |
943 | BTRFSIC_GENERATION_UNKNOWN); | |
944 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
945 | if (NULL == l) { | |
946 | brelse(bh); | |
947 | return -1; | |
948 | } | |
949 | } | |
950 | } | |
951 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES) | |
952 | btrfsic_dump_tree_sub(state, superblock_tmp, 0); | |
953 | ||
954 | brelse(bh); | |
955 | return 0; | |
956 | } | |
957 | ||
958 | static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void) | |
959 | { | |
960 | struct btrfsic_stack_frame *sf; | |
961 | ||
962 | sf = kzalloc(sizeof(*sf), GFP_NOFS); | |
963 | if (NULL == sf) | |
964 | printk(KERN_INFO "btrfsic: alloc memory failed!\n"); | |
965 | else | |
966 | sf->magic = BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER; | |
967 | return sf; | |
968 | } | |
969 | ||
970 | static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf) | |
971 | { | |
972 | BUG_ON(!(NULL == sf || | |
973 | BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER == sf->magic)); | |
974 | kfree(sf); | |
975 | } | |
976 | ||
977 | static int btrfsic_process_metablock( | |
978 | struct btrfsic_state *state, | |
979 | struct btrfsic_block *const first_block, | |
980 | struct btrfsic_block_data_ctx *const first_block_ctx, | |
5db02760 SB |
981 | int first_limit_nesting, int force_iodone_flag) |
982 | { | |
983 | struct btrfsic_stack_frame initial_stack_frame = { 0 }; | |
984 | struct btrfsic_stack_frame *sf; | |
985 | struct btrfsic_stack_frame *next_stack; | |
e06baab4 SB |
986 | struct btrfs_header *const first_hdr = |
987 | (struct btrfs_header *)first_block_ctx->datav[0]; | |
5db02760 | 988 | |
e06baab4 | 989 | BUG_ON(!first_hdr); |
5db02760 SB |
990 | sf = &initial_stack_frame; |
991 | sf->error = 0; | |
992 | sf->i = -1; | |
993 | sf->limit_nesting = first_limit_nesting; | |
994 | sf->block = first_block; | |
995 | sf->block_ctx = first_block_ctx; | |
996 | sf->next_block = NULL; | |
997 | sf->hdr = first_hdr; | |
998 | sf->prev = NULL; | |
999 | ||
1000 | continue_with_new_stack_frame: | |
1001 | sf->block->generation = le64_to_cpu(sf->hdr->generation); | |
1002 | if (0 == sf->hdr->level) { | |
1003 | struct btrfs_leaf *const leafhdr = | |
1004 | (struct btrfs_leaf *)sf->hdr; | |
1005 | ||
1006 | if (-1 == sf->i) { | |
3cae210f | 1007 | sf->nr = btrfs_stack_header_nritems(&leafhdr->header); |
5db02760 SB |
1008 | |
1009 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1010 | printk(KERN_INFO | |
1011 | "leaf %llu items %d generation %llu" | |
1012 | " owner %llu\n", | |
c1c9ff7c | 1013 | sf->block_ctx->start, sf->nr, |
3cae210f QW |
1014 | btrfs_stack_header_generation( |
1015 | &leafhdr->header), | |
3cae210f QW |
1016 | btrfs_stack_header_owner( |
1017 | &leafhdr->header)); | |
5db02760 SB |
1018 | } |
1019 | ||
1020 | continue_with_current_leaf_stack_frame: | |
1021 | if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) { | |
1022 | sf->i++; | |
1023 | sf->num_copies = 0; | |
1024 | } | |
1025 | ||
1026 | if (sf->i < sf->nr) { | |
e06baab4 SB |
1027 | struct btrfs_item disk_item; |
1028 | u32 disk_item_offset = | |
1029 | (uintptr_t)(leafhdr->items + sf->i) - | |
1030 | (uintptr_t)leafhdr; | |
1031 | struct btrfs_disk_key *disk_key; | |
5db02760 | 1032 | u8 type; |
e06baab4 | 1033 | u32 item_offset; |
8ea05e3a | 1034 | u32 item_size; |
5db02760 | 1035 | |
e06baab4 SB |
1036 | if (disk_item_offset + sizeof(struct btrfs_item) > |
1037 | sf->block_ctx->len) { | |
1038 | leaf_item_out_of_bounce_error: | |
1039 | printk(KERN_INFO | |
1040 | "btrfsic: leaf item out of bounce at logical %llu, dev %s\n", | |
1041 | sf->block_ctx->start, | |
1042 | sf->block_ctx->dev->name); | |
1043 | goto one_stack_frame_backwards; | |
1044 | } | |
1045 | btrfsic_read_from_block_data(sf->block_ctx, | |
1046 | &disk_item, | |
1047 | disk_item_offset, | |
1048 | sizeof(struct btrfs_item)); | |
3cae210f | 1049 | item_offset = btrfs_stack_item_offset(&disk_item); |
a5f519c9 | 1050 | item_size = btrfs_stack_item_size(&disk_item); |
e06baab4 | 1051 | disk_key = &disk_item.key; |
3cae210f | 1052 | type = btrfs_disk_key_type(disk_key); |
5db02760 SB |
1053 | |
1054 | if (BTRFS_ROOT_ITEM_KEY == type) { | |
e06baab4 SB |
1055 | struct btrfs_root_item root_item; |
1056 | u32 root_item_offset; | |
1057 | u64 next_bytenr; | |
1058 | ||
1059 | root_item_offset = item_offset + | |
1060 | offsetof(struct btrfs_leaf, items); | |
8ea05e3a | 1061 | if (root_item_offset + item_size > |
e06baab4 SB |
1062 | sf->block_ctx->len) |
1063 | goto leaf_item_out_of_bounce_error; | |
1064 | btrfsic_read_from_block_data( | |
1065 | sf->block_ctx, &root_item, | |
1066 | root_item_offset, | |
8ea05e3a | 1067 | item_size); |
3cae210f | 1068 | next_bytenr = btrfs_root_bytenr(&root_item); |
5db02760 SB |
1069 | |
1070 | sf->error = | |
1071 | btrfsic_create_link_to_next_block( | |
1072 | state, | |
1073 | sf->block, | |
1074 | sf->block_ctx, | |
1075 | next_bytenr, | |
1076 | sf->limit_nesting, | |
1077 | &sf->next_block_ctx, | |
1078 | &sf->next_block, | |
1079 | force_iodone_flag, | |
1080 | &sf->num_copies, | |
1081 | &sf->mirror_num, | |
1082 | disk_key, | |
3cae210f QW |
1083 | btrfs_root_generation( |
1084 | &root_item)); | |
5db02760 SB |
1085 | if (sf->error) |
1086 | goto one_stack_frame_backwards; | |
1087 | ||
1088 | if (NULL != sf->next_block) { | |
1089 | struct btrfs_header *const next_hdr = | |
1090 | (struct btrfs_header *) | |
e06baab4 | 1091 | sf->next_block_ctx.datav[0]; |
5db02760 SB |
1092 | |
1093 | next_stack = | |
1094 | btrfsic_stack_frame_alloc(); | |
1095 | if (NULL == next_stack) { | |
1096 | btrfsic_release_block_ctx( | |
1097 | &sf-> | |
1098 | next_block_ctx); | |
1099 | goto one_stack_frame_backwards; | |
1100 | } | |
1101 | ||
1102 | next_stack->i = -1; | |
1103 | next_stack->block = sf->next_block; | |
1104 | next_stack->block_ctx = | |
1105 | &sf->next_block_ctx; | |
1106 | next_stack->next_block = NULL; | |
1107 | next_stack->hdr = next_hdr; | |
1108 | next_stack->limit_nesting = | |
1109 | sf->limit_nesting - 1; | |
1110 | next_stack->prev = sf; | |
1111 | sf = next_stack; | |
1112 | goto continue_with_new_stack_frame; | |
1113 | } | |
1114 | } else if (BTRFS_EXTENT_DATA_KEY == type && | |
1115 | state->include_extent_data) { | |
1116 | sf->error = btrfsic_handle_extent_data( | |
1117 | state, | |
1118 | sf->block, | |
1119 | sf->block_ctx, | |
1120 | item_offset, | |
1121 | force_iodone_flag); | |
1122 | if (sf->error) | |
1123 | goto one_stack_frame_backwards; | |
1124 | } | |
1125 | ||
1126 | goto continue_with_current_leaf_stack_frame; | |
1127 | } | |
1128 | } else { | |
1129 | struct btrfs_node *const nodehdr = (struct btrfs_node *)sf->hdr; | |
1130 | ||
1131 | if (-1 == sf->i) { | |
3cae210f | 1132 | sf->nr = btrfs_stack_header_nritems(&nodehdr->header); |
5db02760 SB |
1133 | |
1134 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1135 | printk(KERN_INFO "node %llu level %d items %d" | |
1136 | " generation %llu owner %llu\n", | |
5db02760 SB |
1137 | sf->block_ctx->start, |
1138 | nodehdr->header.level, sf->nr, | |
3cae210f QW |
1139 | btrfs_stack_header_generation( |
1140 | &nodehdr->header), | |
3cae210f QW |
1141 | btrfs_stack_header_owner( |
1142 | &nodehdr->header)); | |
5db02760 SB |
1143 | } |
1144 | ||
1145 | continue_with_current_node_stack_frame: | |
1146 | if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) { | |
1147 | sf->i++; | |
1148 | sf->num_copies = 0; | |
1149 | } | |
1150 | ||
1151 | if (sf->i < sf->nr) { | |
e06baab4 SB |
1152 | struct btrfs_key_ptr key_ptr; |
1153 | u32 key_ptr_offset; | |
1154 | u64 next_bytenr; | |
1155 | ||
1156 | key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) - | |
1157 | (uintptr_t)nodehdr; | |
1158 | if (key_ptr_offset + sizeof(struct btrfs_key_ptr) > | |
1159 | sf->block_ctx->len) { | |
1160 | printk(KERN_INFO | |
1161 | "btrfsic: node item out of bounce at logical %llu, dev %s\n", | |
1162 | sf->block_ctx->start, | |
1163 | sf->block_ctx->dev->name); | |
1164 | goto one_stack_frame_backwards; | |
1165 | } | |
1166 | btrfsic_read_from_block_data( | |
1167 | sf->block_ctx, &key_ptr, key_ptr_offset, | |
1168 | sizeof(struct btrfs_key_ptr)); | |
3cae210f | 1169 | next_bytenr = btrfs_stack_key_blockptr(&key_ptr); |
5db02760 SB |
1170 | |
1171 | sf->error = btrfsic_create_link_to_next_block( | |
1172 | state, | |
1173 | sf->block, | |
1174 | sf->block_ctx, | |
1175 | next_bytenr, | |
1176 | sf->limit_nesting, | |
1177 | &sf->next_block_ctx, | |
1178 | &sf->next_block, | |
1179 | force_iodone_flag, | |
1180 | &sf->num_copies, | |
1181 | &sf->mirror_num, | |
e06baab4 | 1182 | &key_ptr.key, |
3cae210f | 1183 | btrfs_stack_key_generation(&key_ptr)); |
5db02760 SB |
1184 | if (sf->error) |
1185 | goto one_stack_frame_backwards; | |
1186 | ||
1187 | if (NULL != sf->next_block) { | |
1188 | struct btrfs_header *const next_hdr = | |
1189 | (struct btrfs_header *) | |
e06baab4 | 1190 | sf->next_block_ctx.datav[0]; |
5db02760 SB |
1191 | |
1192 | next_stack = btrfsic_stack_frame_alloc(); | |
1193 | if (NULL == next_stack) | |
1194 | goto one_stack_frame_backwards; | |
1195 | ||
1196 | next_stack->i = -1; | |
1197 | next_stack->block = sf->next_block; | |
1198 | next_stack->block_ctx = &sf->next_block_ctx; | |
1199 | next_stack->next_block = NULL; | |
1200 | next_stack->hdr = next_hdr; | |
1201 | next_stack->limit_nesting = | |
1202 | sf->limit_nesting - 1; | |
1203 | next_stack->prev = sf; | |
1204 | sf = next_stack; | |
1205 | goto continue_with_new_stack_frame; | |
1206 | } | |
1207 | ||
1208 | goto continue_with_current_node_stack_frame; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | one_stack_frame_backwards: | |
1213 | if (NULL != sf->prev) { | |
1214 | struct btrfsic_stack_frame *const prev = sf->prev; | |
1215 | ||
1216 | /* the one for the initial block is freed in the caller */ | |
1217 | btrfsic_release_block_ctx(sf->block_ctx); | |
1218 | ||
1219 | if (sf->error) { | |
1220 | prev->error = sf->error; | |
1221 | btrfsic_stack_frame_free(sf); | |
1222 | sf = prev; | |
1223 | goto one_stack_frame_backwards; | |
1224 | } | |
1225 | ||
1226 | btrfsic_stack_frame_free(sf); | |
1227 | sf = prev; | |
1228 | goto continue_with_new_stack_frame; | |
1229 | } else { | |
1230 | BUG_ON(&initial_stack_frame != sf); | |
1231 | } | |
1232 | ||
1233 | return sf->error; | |
1234 | } | |
1235 | ||
e06baab4 SB |
1236 | static void btrfsic_read_from_block_data( |
1237 | struct btrfsic_block_data_ctx *block_ctx, | |
1238 | void *dstv, u32 offset, size_t len) | |
1239 | { | |
1240 | size_t cur; | |
1241 | size_t offset_in_page; | |
1242 | char *kaddr; | |
1243 | char *dst = (char *)dstv; | |
1244 | size_t start_offset = block_ctx->start & ((u64)PAGE_CACHE_SIZE - 1); | |
1245 | unsigned long i = (start_offset + offset) >> PAGE_CACHE_SHIFT; | |
1246 | ||
1247 | WARN_ON(offset + len > block_ctx->len); | |
778746b5 | 1248 | offset_in_page = (start_offset + offset) & (PAGE_CACHE_SIZE - 1); |
e06baab4 SB |
1249 | |
1250 | while (len > 0) { | |
1251 | cur = min(len, ((size_t)PAGE_CACHE_SIZE - offset_in_page)); | |
1252 | BUG_ON(i >= (block_ctx->len + PAGE_CACHE_SIZE - 1) >> | |
1253 | PAGE_CACHE_SHIFT); | |
1254 | kaddr = block_ctx->datav[i]; | |
1255 | memcpy(dst, kaddr + offset_in_page, cur); | |
1256 | ||
1257 | dst += cur; | |
1258 | len -= cur; | |
1259 | offset_in_page = 0; | |
1260 | i++; | |
1261 | } | |
1262 | } | |
1263 | ||
5db02760 SB |
1264 | static int btrfsic_create_link_to_next_block( |
1265 | struct btrfsic_state *state, | |
1266 | struct btrfsic_block *block, | |
1267 | struct btrfsic_block_data_ctx *block_ctx, | |
1268 | u64 next_bytenr, | |
1269 | int limit_nesting, | |
1270 | struct btrfsic_block_data_ctx *next_block_ctx, | |
1271 | struct btrfsic_block **next_blockp, | |
1272 | int force_iodone_flag, | |
1273 | int *num_copiesp, int *mirror_nump, | |
1274 | struct btrfs_disk_key *disk_key, | |
1275 | u64 parent_generation) | |
1276 | { | |
1277 | struct btrfsic_block *next_block = NULL; | |
1278 | int ret; | |
1279 | struct btrfsic_block_link *l; | |
1280 | int did_alloc_block_link; | |
1281 | int block_was_created; | |
1282 | ||
1283 | *next_blockp = NULL; | |
1284 | if (0 == *num_copiesp) { | |
1285 | *num_copiesp = | |
5d964051 | 1286 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 1287 | next_bytenr, state->metablock_size); |
5db02760 SB |
1288 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
1289 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 1290 | next_bytenr, *num_copiesp); |
5db02760 SB |
1291 | *mirror_nump = 1; |
1292 | } | |
1293 | ||
1294 | if (*mirror_nump > *num_copiesp) | |
1295 | return 0; | |
1296 | ||
1297 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1298 | printk(KERN_INFO | |
1299 | "btrfsic_create_link_to_next_block(mirror_num=%d)\n", | |
1300 | *mirror_nump); | |
1301 | ret = btrfsic_map_block(state, next_bytenr, | |
e06baab4 | 1302 | state->metablock_size, |
5db02760 SB |
1303 | next_block_ctx, *mirror_nump); |
1304 | if (ret) { | |
1305 | printk(KERN_INFO | |
1306 | "btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n", | |
c1c9ff7c | 1307 | next_bytenr, *mirror_nump); |
5db02760 SB |
1308 | btrfsic_release_block_ctx(next_block_ctx); |
1309 | *next_blockp = NULL; | |
1310 | return -1; | |
1311 | } | |
1312 | ||
1313 | next_block = btrfsic_block_lookup_or_add(state, | |
1314 | next_block_ctx, "referenced ", | |
1315 | 1, force_iodone_flag, | |
1316 | !force_iodone_flag, | |
1317 | *mirror_nump, | |
1318 | &block_was_created); | |
1319 | if (NULL == next_block) { | |
1320 | btrfsic_release_block_ctx(next_block_ctx); | |
1321 | *next_blockp = NULL; | |
1322 | return -1; | |
1323 | } | |
1324 | if (block_was_created) { | |
1325 | l = NULL; | |
1326 | next_block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
1327 | } else { | |
1328 | if (next_block->logical_bytenr != next_bytenr && | |
1329 | !(!next_block->is_metadata && | |
1330 | 0 == next_block->logical_bytenr)) { | |
1331 | printk(KERN_INFO | |
1332 | "Referenced block @%llu (%s/%llu/%d)" | |
1333 | " found in hash table, %c," | |
1334 | " bytenr mismatch (!= stored %llu).\n", | |
c1c9ff7c GU |
1335 | next_bytenr, next_block_ctx->dev->name, |
1336 | next_block_ctx->dev_bytenr, *mirror_nump, | |
5db02760 | 1337 | btrfsic_get_block_type(state, next_block), |
c1c9ff7c | 1338 | next_block->logical_bytenr); |
5db02760 SB |
1339 | } else if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
1340 | printk(KERN_INFO | |
1341 | "Referenced block @%llu (%s/%llu/%d)" | |
1342 | " found in hash table, %c.\n", | |
c1c9ff7c GU |
1343 | next_bytenr, next_block_ctx->dev->name, |
1344 | next_block_ctx->dev_bytenr, *mirror_nump, | |
5db02760 SB |
1345 | btrfsic_get_block_type(state, next_block)); |
1346 | next_block->logical_bytenr = next_bytenr; | |
1347 | ||
1348 | next_block->mirror_num = *mirror_nump; | |
1349 | l = btrfsic_block_link_hashtable_lookup( | |
1350 | next_block_ctx->dev->bdev, | |
1351 | next_block_ctx->dev_bytenr, | |
1352 | block_ctx->dev->bdev, | |
1353 | block_ctx->dev_bytenr, | |
1354 | &state->block_link_hashtable); | |
1355 | } | |
1356 | ||
1357 | next_block->disk_key = *disk_key; | |
1358 | if (NULL == l) { | |
1359 | l = btrfsic_block_link_alloc(); | |
1360 | if (NULL == l) { | |
1361 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
1362 | btrfsic_release_block_ctx(next_block_ctx); | |
1363 | *next_blockp = NULL; | |
1364 | return -1; | |
1365 | } | |
1366 | ||
1367 | did_alloc_block_link = 1; | |
1368 | l->block_ref_to = next_block; | |
1369 | l->block_ref_from = block; | |
1370 | l->ref_cnt = 1; | |
1371 | l->parent_generation = parent_generation; | |
1372 | ||
1373 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1374 | btrfsic_print_add_link(state, l); | |
1375 | ||
1376 | list_add(&l->node_ref_to, &block->ref_to_list); | |
1377 | list_add(&l->node_ref_from, &next_block->ref_from_list); | |
1378 | ||
1379 | btrfsic_block_link_hashtable_add(l, | |
1380 | &state->block_link_hashtable); | |
1381 | } else { | |
1382 | did_alloc_block_link = 0; | |
1383 | if (0 == limit_nesting) { | |
1384 | l->ref_cnt++; | |
1385 | l->parent_generation = parent_generation; | |
1386 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1387 | btrfsic_print_add_link(state, l); | |
1388 | } | |
1389 | } | |
1390 | ||
1391 | if (limit_nesting > 0 && did_alloc_block_link) { | |
1392 | ret = btrfsic_read_block(state, next_block_ctx); | |
e06baab4 | 1393 | if (ret < (int)next_block_ctx->len) { |
5db02760 SB |
1394 | printk(KERN_INFO |
1395 | "btrfsic: read block @logical %llu failed!\n", | |
c1c9ff7c | 1396 | next_bytenr); |
5db02760 SB |
1397 | btrfsic_release_block_ctx(next_block_ctx); |
1398 | *next_blockp = NULL; | |
1399 | return -1; | |
1400 | } | |
1401 | ||
1402 | *next_blockp = next_block; | |
1403 | } else { | |
1404 | *next_blockp = NULL; | |
1405 | } | |
1406 | (*mirror_nump)++; | |
1407 | ||
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static int btrfsic_handle_extent_data( | |
1412 | struct btrfsic_state *state, | |
1413 | struct btrfsic_block *block, | |
1414 | struct btrfsic_block_data_ctx *block_ctx, | |
1415 | u32 item_offset, int force_iodone_flag) | |
1416 | { | |
1417 | int ret; | |
e06baab4 SB |
1418 | struct btrfs_file_extent_item file_extent_item; |
1419 | u64 file_extent_item_offset; | |
1420 | u64 next_bytenr; | |
1421 | u64 num_bytes; | |
1422 | u64 generation; | |
5db02760 SB |
1423 | struct btrfsic_block_link *l; |
1424 | ||
e06baab4 SB |
1425 | file_extent_item_offset = offsetof(struct btrfs_leaf, items) + |
1426 | item_offset; | |
86ff7ffc SB |
1427 | if (file_extent_item_offset + |
1428 | offsetof(struct btrfs_file_extent_item, disk_num_bytes) > | |
1429 | block_ctx->len) { | |
1430 | printk(KERN_INFO | |
1431 | "btrfsic: file item out of bounce at logical %llu, dev %s\n", | |
1432 | block_ctx->start, block_ctx->dev->name); | |
1433 | return -1; | |
1434 | } | |
1435 | ||
1436 | btrfsic_read_from_block_data(block_ctx, &file_extent_item, | |
1437 | file_extent_item_offset, | |
1438 | offsetof(struct btrfs_file_extent_item, disk_num_bytes)); | |
1439 | if (BTRFS_FILE_EXTENT_REG != file_extent_item.type || | |
3cae210f | 1440 | btrfs_stack_file_extent_disk_bytenr(&file_extent_item) == 0) { |
86ff7ffc SB |
1441 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) |
1442 | printk(KERN_INFO "extent_data: type %u, disk_bytenr = %llu\n", | |
1443 | file_extent_item.type, | |
3cae210f QW |
1444 | btrfs_stack_file_extent_disk_bytenr( |
1445 | &file_extent_item)); | |
86ff7ffc SB |
1446 | return 0; |
1447 | } | |
1448 | ||
e06baab4 SB |
1449 | if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) > |
1450 | block_ctx->len) { | |
1451 | printk(KERN_INFO | |
1452 | "btrfsic: file item out of bounce at logical %llu, dev %s\n", | |
1453 | block_ctx->start, block_ctx->dev->name); | |
1454 | return -1; | |
1455 | } | |
1456 | btrfsic_read_from_block_data(block_ctx, &file_extent_item, | |
1457 | file_extent_item_offset, | |
1458 | sizeof(struct btrfs_file_extent_item)); | |
e20d6c5b JB |
1459 | next_bytenr = btrfs_stack_file_extent_disk_bytenr(&file_extent_item); |
1460 | if (btrfs_stack_file_extent_compression(&file_extent_item) == | |
1461 | BTRFS_COMPRESS_NONE) { | |
1462 | next_bytenr += btrfs_stack_file_extent_offset(&file_extent_item); | |
1463 | num_bytes = btrfs_stack_file_extent_num_bytes(&file_extent_item); | |
1464 | } else { | |
1465 | num_bytes = btrfs_stack_file_extent_disk_num_bytes(&file_extent_item); | |
1466 | } | |
3cae210f | 1467 | generation = btrfs_stack_file_extent_generation(&file_extent_item); |
e06baab4 | 1468 | |
5db02760 SB |
1469 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) |
1470 | printk(KERN_INFO "extent_data: type %u, disk_bytenr = %llu," | |
1471 | " offset = %llu, num_bytes = %llu\n", | |
e06baab4 | 1472 | file_extent_item.type, |
3cae210f | 1473 | btrfs_stack_file_extent_disk_bytenr(&file_extent_item), |
3cae210f | 1474 | btrfs_stack_file_extent_offset(&file_extent_item), |
c1c9ff7c | 1475 | num_bytes); |
5db02760 SB |
1476 | while (num_bytes > 0) { |
1477 | u32 chunk_len; | |
1478 | int num_copies; | |
1479 | int mirror_num; | |
1480 | ||
e06baab4 SB |
1481 | if (num_bytes > state->datablock_size) |
1482 | chunk_len = state->datablock_size; | |
5db02760 SB |
1483 | else |
1484 | chunk_len = num_bytes; | |
1485 | ||
1486 | num_copies = | |
5d964051 | 1487 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 1488 | next_bytenr, state->datablock_size); |
5db02760 SB |
1489 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
1490 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 1491 | next_bytenr, num_copies); |
5db02760 SB |
1492 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
1493 | struct btrfsic_block_data_ctx next_block_ctx; | |
1494 | struct btrfsic_block *next_block; | |
1495 | int block_was_created; | |
1496 | ||
1497 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1498 | printk(KERN_INFO "btrfsic_handle_extent_data(" | |
1499 | "mirror_num=%d)\n", mirror_num); | |
1500 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) | |
1501 | printk(KERN_INFO | |
1502 | "\tdisk_bytenr = %llu, num_bytes %u\n", | |
c1c9ff7c | 1503 | next_bytenr, chunk_len); |
5db02760 SB |
1504 | ret = btrfsic_map_block(state, next_bytenr, |
1505 | chunk_len, &next_block_ctx, | |
1506 | mirror_num); | |
1507 | if (ret) { | |
1508 | printk(KERN_INFO | |
1509 | "btrfsic: btrfsic_map_block(@%llu," | |
1510 | " mirror=%d) failed!\n", | |
c1c9ff7c | 1511 | next_bytenr, mirror_num); |
5db02760 SB |
1512 | return -1; |
1513 | } | |
1514 | ||
1515 | next_block = btrfsic_block_lookup_or_add( | |
1516 | state, | |
1517 | &next_block_ctx, | |
1518 | "referenced ", | |
1519 | 0, | |
1520 | force_iodone_flag, | |
1521 | !force_iodone_flag, | |
1522 | mirror_num, | |
1523 | &block_was_created); | |
1524 | if (NULL == next_block) { | |
1525 | printk(KERN_INFO | |
1526 | "btrfsic: error, kmalloc failed!\n"); | |
1527 | btrfsic_release_block_ctx(&next_block_ctx); | |
1528 | return -1; | |
1529 | } | |
1530 | if (!block_was_created) { | |
1531 | if (next_block->logical_bytenr != next_bytenr && | |
1532 | !(!next_block->is_metadata && | |
1533 | 0 == next_block->logical_bytenr)) { | |
1534 | printk(KERN_INFO | |
1535 | "Referenced block" | |
1536 | " @%llu (%s/%llu/%d)" | |
1537 | " found in hash table, D," | |
1538 | " bytenr mismatch" | |
1539 | " (!= stored %llu).\n", | |
c1c9ff7c | 1540 | next_bytenr, |
5db02760 | 1541 | next_block_ctx.dev->name, |
5db02760 SB |
1542 | next_block_ctx.dev_bytenr, |
1543 | mirror_num, | |
5db02760 SB |
1544 | next_block->logical_bytenr); |
1545 | } | |
1546 | next_block->logical_bytenr = next_bytenr; | |
1547 | next_block->mirror_num = mirror_num; | |
1548 | } | |
1549 | ||
1550 | l = btrfsic_block_link_lookup_or_add(state, | |
1551 | &next_block_ctx, | |
1552 | next_block, block, | |
1553 | generation); | |
1554 | btrfsic_release_block_ctx(&next_block_ctx); | |
1555 | if (NULL == l) | |
1556 | return -1; | |
1557 | } | |
1558 | ||
1559 | next_bytenr += chunk_len; | |
1560 | num_bytes -= chunk_len; | |
1561 | } | |
1562 | ||
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len, | |
1567 | struct btrfsic_block_data_ctx *block_ctx_out, | |
1568 | int mirror_num) | |
1569 | { | |
1570 | int ret; | |
1571 | u64 length; | |
1572 | struct btrfs_bio *multi = NULL; | |
1573 | struct btrfs_device *device; | |
1574 | ||
1575 | length = len; | |
3ec706c8 | 1576 | ret = btrfs_map_block(state->root->fs_info, READ, |
5db02760 SB |
1577 | bytenr, &length, &multi, mirror_num); |
1578 | ||
61891923 SB |
1579 | if (ret) { |
1580 | block_ctx_out->start = 0; | |
1581 | block_ctx_out->dev_bytenr = 0; | |
1582 | block_ctx_out->len = 0; | |
1583 | block_ctx_out->dev = NULL; | |
1584 | block_ctx_out->datav = NULL; | |
1585 | block_ctx_out->pagev = NULL; | |
1586 | block_ctx_out->mem_to_free = NULL; | |
1587 | ||
1588 | return ret; | |
1589 | } | |
1590 | ||
5db02760 SB |
1591 | device = multi->stripes[0].dev; |
1592 | block_ctx_out->dev = btrfsic_dev_state_lookup(device->bdev); | |
1593 | block_ctx_out->dev_bytenr = multi->stripes[0].physical; | |
1594 | block_ctx_out->start = bytenr; | |
1595 | block_ctx_out->len = len; | |
e06baab4 SB |
1596 | block_ctx_out->datav = NULL; |
1597 | block_ctx_out->pagev = NULL; | |
1598 | block_ctx_out->mem_to_free = NULL; | |
5db02760 | 1599 | |
61891923 | 1600 | kfree(multi); |
5db02760 SB |
1601 | if (NULL == block_ctx_out->dev) { |
1602 | ret = -ENXIO; | |
1603 | printk(KERN_INFO "btrfsic: error, cannot lookup dev (#1)!\n"); | |
1604 | } | |
1605 | ||
1606 | return ret; | |
1607 | } | |
1608 | ||
1609 | static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr, | |
1610 | u32 len, struct block_device *bdev, | |
1611 | struct btrfsic_block_data_ctx *block_ctx_out) | |
1612 | { | |
1613 | block_ctx_out->dev = btrfsic_dev_state_lookup(bdev); | |
1614 | block_ctx_out->dev_bytenr = bytenr; | |
1615 | block_ctx_out->start = bytenr; | |
1616 | block_ctx_out->len = len; | |
e06baab4 SB |
1617 | block_ctx_out->datav = NULL; |
1618 | block_ctx_out->pagev = NULL; | |
1619 | block_ctx_out->mem_to_free = NULL; | |
5db02760 SB |
1620 | if (NULL != block_ctx_out->dev) { |
1621 | return 0; | |
1622 | } else { | |
1623 | printk(KERN_INFO "btrfsic: error, cannot lookup dev (#2)!\n"); | |
1624 | return -ENXIO; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx) | |
1629 | { | |
e06baab4 SB |
1630 | if (block_ctx->mem_to_free) { |
1631 | unsigned int num_pages; | |
1632 | ||
1633 | BUG_ON(!block_ctx->datav); | |
1634 | BUG_ON(!block_ctx->pagev); | |
1635 | num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >> | |
1636 | PAGE_CACHE_SHIFT; | |
1637 | while (num_pages > 0) { | |
1638 | num_pages--; | |
1639 | if (block_ctx->datav[num_pages]) { | |
1640 | kunmap(block_ctx->pagev[num_pages]); | |
1641 | block_ctx->datav[num_pages] = NULL; | |
1642 | } | |
1643 | if (block_ctx->pagev[num_pages]) { | |
1644 | __free_page(block_ctx->pagev[num_pages]); | |
1645 | block_ctx->pagev[num_pages] = NULL; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | kfree(block_ctx->mem_to_free); | |
1650 | block_ctx->mem_to_free = NULL; | |
1651 | block_ctx->pagev = NULL; | |
1652 | block_ctx->datav = NULL; | |
5db02760 SB |
1653 | } |
1654 | } | |
1655 | ||
1656 | static int btrfsic_read_block(struct btrfsic_state *state, | |
1657 | struct btrfsic_block_data_ctx *block_ctx) | |
1658 | { | |
e06baab4 SB |
1659 | unsigned int num_pages; |
1660 | unsigned int i; | |
1661 | u64 dev_bytenr; | |
1662 | int ret; | |
1663 | ||
1664 | BUG_ON(block_ctx->datav); | |
1665 | BUG_ON(block_ctx->pagev); | |
1666 | BUG_ON(block_ctx->mem_to_free); | |
1667 | if (block_ctx->dev_bytenr & ((u64)PAGE_CACHE_SIZE - 1)) { | |
5db02760 SB |
1668 | printk(KERN_INFO |
1669 | "btrfsic: read_block() with unaligned bytenr %llu\n", | |
c1c9ff7c | 1670 | block_ctx->dev_bytenr); |
5db02760 SB |
1671 | return -1; |
1672 | } | |
e06baab4 SB |
1673 | |
1674 | num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >> | |
1675 | PAGE_CACHE_SHIFT; | |
1676 | block_ctx->mem_to_free = kzalloc((sizeof(*block_ctx->datav) + | |
1677 | sizeof(*block_ctx->pagev)) * | |
1678 | num_pages, GFP_NOFS); | |
1679 | if (!block_ctx->mem_to_free) | |
5db02760 | 1680 | return -1; |
e06baab4 SB |
1681 | block_ctx->datav = block_ctx->mem_to_free; |
1682 | block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages); | |
1683 | for (i = 0; i < num_pages; i++) { | |
1684 | block_ctx->pagev[i] = alloc_page(GFP_NOFS); | |
1685 | if (!block_ctx->pagev[i]) | |
1686 | return -1; | |
5db02760 SB |
1687 | } |
1688 | ||
e06baab4 SB |
1689 | dev_bytenr = block_ctx->dev_bytenr; |
1690 | for (i = 0; i < num_pages;) { | |
1691 | struct bio *bio; | |
1692 | unsigned int j; | |
e06baab4 | 1693 | |
9be3395b | 1694 | bio = btrfs_io_bio_alloc(GFP_NOFS, num_pages - i); |
e06baab4 SB |
1695 | if (!bio) { |
1696 | printk(KERN_INFO | |
1697 | "btrfsic: bio_alloc() for %u pages failed!\n", | |
1698 | num_pages - i); | |
1699 | return -1; | |
1700 | } | |
1701 | bio->bi_bdev = block_ctx->dev->bdev; | |
4f024f37 | 1702 | bio->bi_iter.bi_sector = dev_bytenr >> 9; |
e06baab4 SB |
1703 | |
1704 | for (j = i; j < num_pages; j++) { | |
1705 | ret = bio_add_page(bio, block_ctx->pagev[j], | |
1706 | PAGE_CACHE_SIZE, 0); | |
1707 | if (PAGE_CACHE_SIZE != ret) | |
1708 | break; | |
1709 | } | |
1710 | if (j == i) { | |
1711 | printk(KERN_INFO | |
1712 | "btrfsic: error, failed to add a single page!\n"); | |
1713 | return -1; | |
1714 | } | |
33879d45 | 1715 | if (submit_bio_wait(READ, bio)) { |
e06baab4 SB |
1716 | printk(KERN_INFO |
1717 | "btrfsic: read error at logical %llu dev %s!\n", | |
1718 | block_ctx->start, block_ctx->dev->name); | |
1719 | bio_put(bio); | |
1720 | return -1; | |
1721 | } | |
1722 | bio_put(bio); | |
1723 | dev_bytenr += (j - i) * PAGE_CACHE_SIZE; | |
1724 | i = j; | |
1725 | } | |
1726 | for (i = 0; i < num_pages; i++) { | |
1727 | block_ctx->datav[i] = kmap(block_ctx->pagev[i]); | |
1728 | if (!block_ctx->datav[i]) { | |
1729 | printk(KERN_INFO "btrfsic: kmap() failed (dev %s)!\n", | |
1730 | block_ctx->dev->name); | |
1731 | return -1; | |
1732 | } | |
1733 | } | |
5db02760 SB |
1734 | |
1735 | return block_ctx->len; | |
1736 | } | |
1737 | ||
1738 | static void btrfsic_dump_database(struct btrfsic_state *state) | |
1739 | { | |
1740 | struct list_head *elem_all; | |
1741 | ||
1742 | BUG_ON(NULL == state); | |
1743 | ||
1744 | printk(KERN_INFO "all_blocks_list:\n"); | |
1745 | list_for_each(elem_all, &state->all_blocks_list) { | |
1746 | const struct btrfsic_block *const b_all = | |
1747 | list_entry(elem_all, struct btrfsic_block, | |
1748 | all_blocks_node); | |
1749 | struct list_head *elem_ref_to; | |
1750 | struct list_head *elem_ref_from; | |
1751 | ||
1752 | printk(KERN_INFO "%c-block @%llu (%s/%llu/%d)\n", | |
1753 | btrfsic_get_block_type(state, b_all), | |
c1c9ff7c GU |
1754 | b_all->logical_bytenr, b_all->dev_state->name, |
1755 | b_all->dev_bytenr, b_all->mirror_num); | |
5db02760 SB |
1756 | |
1757 | list_for_each(elem_ref_to, &b_all->ref_to_list) { | |
1758 | const struct btrfsic_block_link *const l = | |
1759 | list_entry(elem_ref_to, | |
1760 | struct btrfsic_block_link, | |
1761 | node_ref_to); | |
1762 | ||
1763 | printk(KERN_INFO " %c @%llu (%s/%llu/%d)" | |
1764 | " refers %u* to" | |
1765 | " %c @%llu (%s/%llu/%d)\n", | |
1766 | btrfsic_get_block_type(state, b_all), | |
c1c9ff7c GU |
1767 | b_all->logical_bytenr, b_all->dev_state->name, |
1768 | b_all->dev_bytenr, b_all->mirror_num, | |
5db02760 SB |
1769 | l->ref_cnt, |
1770 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
1771 | l->block_ref_to->logical_bytenr, |
1772 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 1773 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
1774 | l->block_ref_to->mirror_num); |
1775 | } | |
1776 | ||
1777 | list_for_each(elem_ref_from, &b_all->ref_from_list) { | |
1778 | const struct btrfsic_block_link *const l = | |
1779 | list_entry(elem_ref_from, | |
1780 | struct btrfsic_block_link, | |
1781 | node_ref_from); | |
1782 | ||
1783 | printk(KERN_INFO " %c @%llu (%s/%llu/%d)" | |
1784 | " is ref %u* from" | |
1785 | " %c @%llu (%s/%llu/%d)\n", | |
1786 | btrfsic_get_block_type(state, b_all), | |
c1c9ff7c GU |
1787 | b_all->logical_bytenr, b_all->dev_state->name, |
1788 | b_all->dev_bytenr, b_all->mirror_num, | |
5db02760 SB |
1789 | l->ref_cnt, |
1790 | btrfsic_get_block_type(state, l->block_ref_from), | |
5db02760 SB |
1791 | l->block_ref_from->logical_bytenr, |
1792 | l->block_ref_from->dev_state->name, | |
5db02760 SB |
1793 | l->block_ref_from->dev_bytenr, |
1794 | l->block_ref_from->mirror_num); | |
1795 | } | |
1796 | ||
1797 | printk(KERN_INFO "\n"); | |
1798 | } | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * Test whether the disk block contains a tree block (leaf or node) | |
1803 | * (note that this test fails for the super block) | |
1804 | */ | |
1805 | static int btrfsic_test_for_metadata(struct btrfsic_state *state, | |
e06baab4 | 1806 | char **datav, unsigned int num_pages) |
5db02760 SB |
1807 | { |
1808 | struct btrfs_header *h; | |
1809 | u8 csum[BTRFS_CSUM_SIZE]; | |
1810 | u32 crc = ~(u32)0; | |
e06baab4 | 1811 | unsigned int i; |
5db02760 | 1812 | |
e06baab4 SB |
1813 | if (num_pages * PAGE_CACHE_SIZE < state->metablock_size) |
1814 | return 1; /* not metadata */ | |
1815 | num_pages = state->metablock_size >> PAGE_CACHE_SHIFT; | |
1816 | h = (struct btrfs_header *)datav[0]; | |
5db02760 SB |
1817 | |
1818 | if (memcmp(h->fsid, state->root->fs_info->fsid, BTRFS_UUID_SIZE)) | |
e06baab4 | 1819 | return 1; |
5db02760 | 1820 | |
e06baab4 SB |
1821 | for (i = 0; i < num_pages; i++) { |
1822 | u8 *data = i ? datav[i] : (datav[i] + BTRFS_CSUM_SIZE); | |
1823 | size_t sublen = i ? PAGE_CACHE_SIZE : | |
1824 | (PAGE_CACHE_SIZE - BTRFS_CSUM_SIZE); | |
1825 | ||
0b947aff | 1826 | crc = btrfs_crc32c(crc, data, sublen); |
e06baab4 | 1827 | } |
5db02760 SB |
1828 | btrfs_csum_final(crc, csum); |
1829 | if (memcmp(csum, h->csum, state->csum_size)) | |
e06baab4 | 1830 | return 1; |
5db02760 | 1831 | |
e06baab4 | 1832 | return 0; /* is metadata */ |
5db02760 SB |
1833 | } |
1834 | ||
1835 | static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state, | |
e06baab4 SB |
1836 | u64 dev_bytenr, char **mapped_datav, |
1837 | unsigned int num_pages, | |
1838 | struct bio *bio, int *bio_is_patched, | |
5db02760 SB |
1839 | struct buffer_head *bh, |
1840 | int submit_bio_bh_rw) | |
1841 | { | |
1842 | int is_metadata; | |
1843 | struct btrfsic_block *block; | |
1844 | struct btrfsic_block_data_ctx block_ctx; | |
1845 | int ret; | |
1846 | struct btrfsic_state *state = dev_state->state; | |
1847 | struct block_device *bdev = dev_state->bdev; | |
e06baab4 | 1848 | unsigned int processed_len; |
5db02760 | 1849 | |
5db02760 SB |
1850 | if (NULL != bio_is_patched) |
1851 | *bio_is_patched = 0; | |
1852 | ||
e06baab4 SB |
1853 | again: |
1854 | if (num_pages == 0) | |
1855 | return; | |
1856 | ||
1857 | processed_len = 0; | |
1858 | is_metadata = (0 == btrfsic_test_for_metadata(state, mapped_datav, | |
1859 | num_pages)); | |
1860 | ||
5db02760 SB |
1861 | block = btrfsic_block_hashtable_lookup(bdev, dev_bytenr, |
1862 | &state->block_hashtable); | |
1863 | if (NULL != block) { | |
0b485143 | 1864 | u64 bytenr = 0; |
5db02760 SB |
1865 | struct list_head *elem_ref_to; |
1866 | struct list_head *tmp_ref_to; | |
1867 | ||
1868 | if (block->is_superblock) { | |
3cae210f QW |
1869 | bytenr = btrfs_super_bytenr((struct btrfs_super_block *) |
1870 | mapped_datav[0]); | |
e06baab4 SB |
1871 | if (num_pages * PAGE_CACHE_SIZE < |
1872 | BTRFS_SUPER_INFO_SIZE) { | |
1873 | printk(KERN_INFO | |
1874 | "btrfsic: cannot work with too short bios!\n"); | |
1875 | return; | |
1876 | } | |
5db02760 | 1877 | is_metadata = 1; |
e06baab4 SB |
1878 | BUG_ON(BTRFS_SUPER_INFO_SIZE & (PAGE_CACHE_SIZE - 1)); |
1879 | processed_len = BTRFS_SUPER_INFO_SIZE; | |
5db02760 SB |
1880 | if (state->print_mask & |
1881 | BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE) { | |
1882 | printk(KERN_INFO | |
1883 | "[before new superblock is written]:\n"); | |
1884 | btrfsic_dump_tree_sub(state, block, 0); | |
1885 | } | |
1886 | } | |
1887 | if (is_metadata) { | |
1888 | if (!block->is_superblock) { | |
e06baab4 SB |
1889 | if (num_pages * PAGE_CACHE_SIZE < |
1890 | state->metablock_size) { | |
1891 | printk(KERN_INFO | |
1892 | "btrfsic: cannot work with too short bios!\n"); | |
1893 | return; | |
1894 | } | |
1895 | processed_len = state->metablock_size; | |
3cae210f QW |
1896 | bytenr = btrfs_stack_header_bytenr( |
1897 | (struct btrfs_header *) | |
1898 | mapped_datav[0]); | |
5db02760 SB |
1899 | btrfsic_cmp_log_and_dev_bytenr(state, bytenr, |
1900 | dev_state, | |
e06baab4 | 1901 | dev_bytenr); |
5db02760 | 1902 | } |
301993a4 SB |
1903 | if (block->logical_bytenr != bytenr && |
1904 | !(!block->is_metadata && | |
1905 | block->logical_bytenr == 0)) | |
5db02760 SB |
1906 | printk(KERN_INFO |
1907 | "Written block @%llu (%s/%llu/%d)" | |
1908 | " found in hash table, %c," | |
1909 | " bytenr mismatch" | |
1910 | " (!= stored %llu).\n", | |
c1c9ff7c | 1911 | bytenr, dev_state->name, dev_bytenr, |
5db02760 SB |
1912 | block->mirror_num, |
1913 | btrfsic_get_block_type(state, block), | |
5db02760 | 1914 | block->logical_bytenr); |
301993a4 | 1915 | else if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
5db02760 SB |
1916 | printk(KERN_INFO |
1917 | "Written block @%llu (%s/%llu/%d)" | |
1918 | " found in hash table, %c.\n", | |
c1c9ff7c | 1919 | bytenr, dev_state->name, dev_bytenr, |
5db02760 SB |
1920 | block->mirror_num, |
1921 | btrfsic_get_block_type(state, block)); | |
301993a4 | 1922 | block->logical_bytenr = bytenr; |
5db02760 | 1923 | } else { |
e06baab4 SB |
1924 | if (num_pages * PAGE_CACHE_SIZE < |
1925 | state->datablock_size) { | |
1926 | printk(KERN_INFO | |
1927 | "btrfsic: cannot work with too short bios!\n"); | |
1928 | return; | |
1929 | } | |
1930 | processed_len = state->datablock_size; | |
5db02760 SB |
1931 | bytenr = block->logical_bytenr; |
1932 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1933 | printk(KERN_INFO | |
1934 | "Written block @%llu (%s/%llu/%d)" | |
1935 | " found in hash table, %c.\n", | |
c1c9ff7c | 1936 | bytenr, dev_state->name, dev_bytenr, |
5db02760 SB |
1937 | block->mirror_num, |
1938 | btrfsic_get_block_type(state, block)); | |
1939 | } | |
1940 | ||
1941 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1942 | printk(KERN_INFO | |
1943 | "ref_to_list: %cE, ref_from_list: %cE\n", | |
1944 | list_empty(&block->ref_to_list) ? ' ' : '!', | |
1945 | list_empty(&block->ref_from_list) ? ' ' : '!'); | |
1946 | if (btrfsic_is_block_ref_by_superblock(state, block, 0)) { | |
1947 | printk(KERN_INFO "btrfs: attempt to overwrite %c-block" | |
1948 | " @%llu (%s/%llu/%d), old(gen=%llu," | |
1949 | " objectid=%llu, type=%d, offset=%llu)," | |
1950 | " new(gen=%llu)," | |
1951 | " which is referenced by most recent superblock" | |
1952 | " (superblockgen=%llu)!\n", | |
c1c9ff7c GU |
1953 | btrfsic_get_block_type(state, block), bytenr, |
1954 | dev_state->name, dev_bytenr, block->mirror_num, | |
1955 | block->generation, | |
3cae210f | 1956 | btrfs_disk_key_objectid(&block->disk_key), |
5db02760 | 1957 | block->disk_key.type, |
3cae210f | 1958 | btrfs_disk_key_offset(&block->disk_key), |
3cae210f QW |
1959 | btrfs_stack_header_generation( |
1960 | (struct btrfs_header *) mapped_datav[0]), | |
5db02760 SB |
1961 | state->max_superblock_generation); |
1962 | btrfsic_dump_tree(state); | |
1963 | } | |
1964 | ||
1965 | if (!block->is_iodone && !block->never_written) { | |
1966 | printk(KERN_INFO "btrfs: attempt to overwrite %c-block" | |
1967 | " @%llu (%s/%llu/%d), oldgen=%llu, newgen=%llu," | |
1968 | " which is not yet iodone!\n", | |
c1c9ff7c GU |
1969 | btrfsic_get_block_type(state, block), bytenr, |
1970 | dev_state->name, dev_bytenr, block->mirror_num, | |
1971 | block->generation, | |
3cae210f QW |
1972 | btrfs_stack_header_generation( |
1973 | (struct btrfs_header *) | |
1974 | mapped_datav[0])); | |
5db02760 SB |
1975 | /* it would not be safe to go on */ |
1976 | btrfsic_dump_tree(state); | |
e06baab4 | 1977 | goto continue_loop; |
5db02760 SB |
1978 | } |
1979 | ||
1980 | /* | |
1981 | * Clear all references of this block. Do not free | |
1982 | * the block itself even if is not referenced anymore | |
1983 | * because it still carries valueable information | |
1984 | * like whether it was ever written and IO completed. | |
1985 | */ | |
1986 | list_for_each_safe(elem_ref_to, tmp_ref_to, | |
1987 | &block->ref_to_list) { | |
1988 | struct btrfsic_block_link *const l = | |
1989 | list_entry(elem_ref_to, | |
1990 | struct btrfsic_block_link, | |
1991 | node_ref_to); | |
1992 | ||
1993 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1994 | btrfsic_print_rem_link(state, l); | |
1995 | l->ref_cnt--; | |
1996 | if (0 == l->ref_cnt) { | |
1997 | list_del(&l->node_ref_to); | |
1998 | list_del(&l->node_ref_from); | |
1999 | btrfsic_block_link_hashtable_remove(l); | |
2000 | btrfsic_block_link_free(l); | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | if (block->is_superblock) | |
e06baab4 SB |
2005 | ret = btrfsic_map_superblock(state, bytenr, |
2006 | processed_len, | |
5db02760 SB |
2007 | bdev, &block_ctx); |
2008 | else | |
e06baab4 | 2009 | ret = btrfsic_map_block(state, bytenr, processed_len, |
5db02760 SB |
2010 | &block_ctx, 0); |
2011 | if (ret) { | |
2012 | printk(KERN_INFO | |
2013 | "btrfsic: btrfsic_map_block(root @%llu)" | |
c1c9ff7c | 2014 | " failed!\n", bytenr); |
e06baab4 | 2015 | goto continue_loop; |
5db02760 | 2016 | } |
e06baab4 | 2017 | block_ctx.datav = mapped_datav; |
5db02760 SB |
2018 | /* the following is required in case of writes to mirrors, |
2019 | * use the same that was used for the lookup */ | |
2020 | block_ctx.dev = dev_state; | |
2021 | block_ctx.dev_bytenr = dev_bytenr; | |
2022 | ||
2023 | if (is_metadata || state->include_extent_data) { | |
2024 | block->never_written = 0; | |
2025 | block->iodone_w_error = 0; | |
2026 | if (NULL != bio) { | |
2027 | block->is_iodone = 0; | |
2028 | BUG_ON(NULL == bio_is_patched); | |
2029 | if (!*bio_is_patched) { | |
2030 | block->orig_bio_bh_private = | |
2031 | bio->bi_private; | |
2032 | block->orig_bio_bh_end_io.bio = | |
2033 | bio->bi_end_io; | |
2034 | block->next_in_same_bio = NULL; | |
2035 | bio->bi_private = block; | |
2036 | bio->bi_end_io = btrfsic_bio_end_io; | |
2037 | *bio_is_patched = 1; | |
2038 | } else { | |
2039 | struct btrfsic_block *chained_block = | |
2040 | (struct btrfsic_block *) | |
2041 | bio->bi_private; | |
2042 | ||
2043 | BUG_ON(NULL == chained_block); | |
2044 | block->orig_bio_bh_private = | |
2045 | chained_block->orig_bio_bh_private; | |
2046 | block->orig_bio_bh_end_io.bio = | |
2047 | chained_block->orig_bio_bh_end_io. | |
2048 | bio; | |
2049 | block->next_in_same_bio = chained_block; | |
2050 | bio->bi_private = block; | |
2051 | } | |
2052 | } else if (NULL != bh) { | |
2053 | block->is_iodone = 0; | |
2054 | block->orig_bio_bh_private = bh->b_private; | |
2055 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2056 | block->next_in_same_bio = NULL; | |
2057 | bh->b_private = block; | |
2058 | bh->b_end_io = btrfsic_bh_end_io; | |
2059 | } else { | |
2060 | block->is_iodone = 1; | |
2061 | block->orig_bio_bh_private = NULL; | |
2062 | block->orig_bio_bh_end_io.bio = NULL; | |
2063 | block->next_in_same_bio = NULL; | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2068 | block->submit_bio_bh_rw = submit_bio_bh_rw; | |
2069 | if (is_metadata) { | |
2070 | block->logical_bytenr = bytenr; | |
2071 | block->is_metadata = 1; | |
2072 | if (block->is_superblock) { | |
e06baab4 SB |
2073 | BUG_ON(PAGE_CACHE_SIZE != |
2074 | BTRFS_SUPER_INFO_SIZE); | |
5db02760 SB |
2075 | ret = btrfsic_process_written_superblock( |
2076 | state, | |
2077 | block, | |
2078 | (struct btrfs_super_block *) | |
e06baab4 | 2079 | mapped_datav[0]); |
5db02760 SB |
2080 | if (state->print_mask & |
2081 | BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE) { | |
2082 | printk(KERN_INFO | |
2083 | "[after new superblock is written]:\n"); | |
2084 | btrfsic_dump_tree_sub(state, block, 0); | |
2085 | } | |
2086 | } else { | |
2087 | block->mirror_num = 0; /* unknown */ | |
2088 | ret = btrfsic_process_metablock( | |
2089 | state, | |
2090 | block, | |
2091 | &block_ctx, | |
5db02760 SB |
2092 | 0, 0); |
2093 | } | |
2094 | if (ret) | |
2095 | printk(KERN_INFO | |
2096 | "btrfsic: btrfsic_process_metablock" | |
2097 | "(root @%llu) failed!\n", | |
c1c9ff7c | 2098 | dev_bytenr); |
5db02760 SB |
2099 | } else { |
2100 | block->is_metadata = 0; | |
2101 | block->mirror_num = 0; /* unknown */ | |
2102 | block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
2103 | if (!state->include_extent_data | |
2104 | && list_empty(&block->ref_from_list)) { | |
2105 | /* | |
2106 | * disk block is overwritten with extent | |
2107 | * data (not meta data) and we are configured | |
2108 | * to not include extent data: take the | |
2109 | * chance and free the block's memory | |
2110 | */ | |
2111 | btrfsic_block_hashtable_remove(block); | |
2112 | list_del(&block->all_blocks_node); | |
2113 | btrfsic_block_free(block); | |
2114 | } | |
2115 | } | |
2116 | btrfsic_release_block_ctx(&block_ctx); | |
2117 | } else { | |
2118 | /* block has not been found in hash table */ | |
2119 | u64 bytenr; | |
2120 | ||
2121 | if (!is_metadata) { | |
e06baab4 | 2122 | processed_len = state->datablock_size; |
5db02760 SB |
2123 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
2124 | printk(KERN_INFO "Written block (%s/%llu/?)" | |
2125 | " !found in hash table, D.\n", | |
c1c9ff7c | 2126 | dev_state->name, dev_bytenr); |
e06baab4 SB |
2127 | if (!state->include_extent_data) { |
2128 | /* ignore that written D block */ | |
2129 | goto continue_loop; | |
2130 | } | |
5db02760 SB |
2131 | |
2132 | /* this is getting ugly for the | |
2133 | * include_extent_data case... */ | |
2134 | bytenr = 0; /* unknown */ | |
2135 | block_ctx.start = bytenr; | |
e06baab4 SB |
2136 | block_ctx.len = processed_len; |
2137 | block_ctx.mem_to_free = NULL; | |
2138 | block_ctx.pagev = NULL; | |
5db02760 | 2139 | } else { |
e06baab4 | 2140 | processed_len = state->metablock_size; |
3cae210f QW |
2141 | bytenr = btrfs_stack_header_bytenr( |
2142 | (struct btrfs_header *) | |
2143 | mapped_datav[0]); | |
5db02760 | 2144 | btrfsic_cmp_log_and_dev_bytenr(state, bytenr, dev_state, |
e06baab4 | 2145 | dev_bytenr); |
5db02760 SB |
2146 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
2147 | printk(KERN_INFO | |
2148 | "Written block @%llu (%s/%llu/?)" | |
2149 | " !found in hash table, M.\n", | |
c1c9ff7c | 2150 | bytenr, dev_state->name, dev_bytenr); |
5db02760 | 2151 | |
e06baab4 SB |
2152 | ret = btrfsic_map_block(state, bytenr, processed_len, |
2153 | &block_ctx, 0); | |
5db02760 SB |
2154 | if (ret) { |
2155 | printk(KERN_INFO | |
2156 | "btrfsic: btrfsic_map_block(root @%llu)" | |
2157 | " failed!\n", | |
c1c9ff7c | 2158 | dev_bytenr); |
e06baab4 | 2159 | goto continue_loop; |
5db02760 SB |
2160 | } |
2161 | } | |
e06baab4 | 2162 | block_ctx.datav = mapped_datav; |
5db02760 SB |
2163 | /* the following is required in case of writes to mirrors, |
2164 | * use the same that was used for the lookup */ | |
2165 | block_ctx.dev = dev_state; | |
2166 | block_ctx.dev_bytenr = dev_bytenr; | |
2167 | ||
2168 | block = btrfsic_block_alloc(); | |
2169 | if (NULL == block) { | |
2170 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
2171 | btrfsic_release_block_ctx(&block_ctx); | |
e06baab4 | 2172 | goto continue_loop; |
5db02760 SB |
2173 | } |
2174 | block->dev_state = dev_state; | |
2175 | block->dev_bytenr = dev_bytenr; | |
2176 | block->logical_bytenr = bytenr; | |
2177 | block->is_metadata = is_metadata; | |
2178 | block->never_written = 0; | |
2179 | block->iodone_w_error = 0; | |
2180 | block->mirror_num = 0; /* unknown */ | |
2181 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2182 | block->submit_bio_bh_rw = submit_bio_bh_rw; | |
2183 | if (NULL != bio) { | |
2184 | block->is_iodone = 0; | |
2185 | BUG_ON(NULL == bio_is_patched); | |
2186 | if (!*bio_is_patched) { | |
2187 | block->orig_bio_bh_private = bio->bi_private; | |
2188 | block->orig_bio_bh_end_io.bio = bio->bi_end_io; | |
2189 | block->next_in_same_bio = NULL; | |
2190 | bio->bi_private = block; | |
2191 | bio->bi_end_io = btrfsic_bio_end_io; | |
2192 | *bio_is_patched = 1; | |
2193 | } else { | |
2194 | struct btrfsic_block *chained_block = | |
2195 | (struct btrfsic_block *) | |
2196 | bio->bi_private; | |
2197 | ||
2198 | BUG_ON(NULL == chained_block); | |
2199 | block->orig_bio_bh_private = | |
2200 | chained_block->orig_bio_bh_private; | |
2201 | block->orig_bio_bh_end_io.bio = | |
2202 | chained_block->orig_bio_bh_end_io.bio; | |
2203 | block->next_in_same_bio = chained_block; | |
2204 | bio->bi_private = block; | |
2205 | } | |
2206 | } else if (NULL != bh) { | |
2207 | block->is_iodone = 0; | |
2208 | block->orig_bio_bh_private = bh->b_private; | |
2209 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2210 | block->next_in_same_bio = NULL; | |
2211 | bh->b_private = block; | |
2212 | bh->b_end_io = btrfsic_bh_end_io; | |
2213 | } else { | |
2214 | block->is_iodone = 1; | |
2215 | block->orig_bio_bh_private = NULL; | |
2216 | block->orig_bio_bh_end_io.bio = NULL; | |
2217 | block->next_in_same_bio = NULL; | |
2218 | } | |
2219 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2220 | printk(KERN_INFO | |
2221 | "New written %c-block @%llu (%s/%llu/%d)\n", | |
2222 | is_metadata ? 'M' : 'D', | |
c1c9ff7c GU |
2223 | block->logical_bytenr, block->dev_state->name, |
2224 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2225 | list_add(&block->all_blocks_node, &state->all_blocks_list); |
2226 | btrfsic_block_hashtable_add(block, &state->block_hashtable); | |
2227 | ||
2228 | if (is_metadata) { | |
2229 | ret = btrfsic_process_metablock(state, block, | |
e06baab4 | 2230 | &block_ctx, 0, 0); |
5db02760 SB |
2231 | if (ret) |
2232 | printk(KERN_INFO | |
2233 | "btrfsic: process_metablock(root @%llu)" | |
2234 | " failed!\n", | |
c1c9ff7c | 2235 | dev_bytenr); |
5db02760 SB |
2236 | } |
2237 | btrfsic_release_block_ctx(&block_ctx); | |
2238 | } | |
e06baab4 SB |
2239 | |
2240 | continue_loop: | |
2241 | BUG_ON(!processed_len); | |
2242 | dev_bytenr += processed_len; | |
2243 | mapped_datav += processed_len >> PAGE_CACHE_SHIFT; | |
2244 | num_pages -= processed_len >> PAGE_CACHE_SHIFT; | |
2245 | goto again; | |
5db02760 SB |
2246 | } |
2247 | ||
2248 | static void btrfsic_bio_end_io(struct bio *bp, int bio_error_status) | |
2249 | { | |
2250 | struct btrfsic_block *block = (struct btrfsic_block *)bp->bi_private; | |
2251 | int iodone_w_error; | |
2252 | ||
2253 | /* mutex is not held! This is not save if IO is not yet completed | |
2254 | * on umount */ | |
2255 | iodone_w_error = 0; | |
2256 | if (bio_error_status) | |
2257 | iodone_w_error = 1; | |
2258 | ||
2259 | BUG_ON(NULL == block); | |
2260 | bp->bi_private = block->orig_bio_bh_private; | |
2261 | bp->bi_end_io = block->orig_bio_bh_end_io.bio; | |
2262 | ||
2263 | do { | |
2264 | struct btrfsic_block *next_block; | |
2265 | struct btrfsic_dev_state *const dev_state = block->dev_state; | |
2266 | ||
2267 | if ((dev_state->state->print_mask & | |
2268 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2269 | printk(KERN_INFO | |
2270 | "bio_end_io(err=%d) for %c @%llu (%s/%llu/%d)\n", | |
2271 | bio_error_status, | |
2272 | btrfsic_get_block_type(dev_state->state, block), | |
c1c9ff7c GU |
2273 | block->logical_bytenr, dev_state->name, |
2274 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2275 | next_block = block->next_in_same_bio; |
2276 | block->iodone_w_error = iodone_w_error; | |
2277 | if (block->submit_bio_bh_rw & REQ_FLUSH) { | |
2278 | dev_state->last_flush_gen++; | |
2279 | if ((dev_state->state->print_mask & | |
2280 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2281 | printk(KERN_INFO | |
2282 | "bio_end_io() new %s flush_gen=%llu\n", | |
2283 | dev_state->name, | |
5db02760 SB |
2284 | dev_state->last_flush_gen); |
2285 | } | |
2286 | if (block->submit_bio_bh_rw & REQ_FUA) | |
2287 | block->flush_gen = 0; /* FUA completed means block is | |
2288 | * on disk */ | |
2289 | block->is_iodone = 1; /* for FLUSH, this releases the block */ | |
2290 | block = next_block; | |
2291 | } while (NULL != block); | |
2292 | ||
2293 | bp->bi_end_io(bp, bio_error_status); | |
2294 | } | |
2295 | ||
2296 | static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate) | |
2297 | { | |
2298 | struct btrfsic_block *block = (struct btrfsic_block *)bh->b_private; | |
2299 | int iodone_w_error = !uptodate; | |
2300 | struct btrfsic_dev_state *dev_state; | |
2301 | ||
2302 | BUG_ON(NULL == block); | |
2303 | dev_state = block->dev_state; | |
2304 | if ((dev_state->state->print_mask & BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2305 | printk(KERN_INFO | |
2306 | "bh_end_io(error=%d) for %c @%llu (%s/%llu/%d)\n", | |
2307 | iodone_w_error, | |
2308 | btrfsic_get_block_type(dev_state->state, block), | |
c1c9ff7c GU |
2309 | block->logical_bytenr, block->dev_state->name, |
2310 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2311 | |
2312 | block->iodone_w_error = iodone_w_error; | |
2313 | if (block->submit_bio_bh_rw & REQ_FLUSH) { | |
2314 | dev_state->last_flush_gen++; | |
2315 | if ((dev_state->state->print_mask & | |
2316 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2317 | printk(KERN_INFO | |
2318 | "bh_end_io() new %s flush_gen=%llu\n", | |
c1c9ff7c | 2319 | dev_state->name, dev_state->last_flush_gen); |
5db02760 SB |
2320 | } |
2321 | if (block->submit_bio_bh_rw & REQ_FUA) | |
2322 | block->flush_gen = 0; /* FUA completed means block is on disk */ | |
2323 | ||
2324 | bh->b_private = block->orig_bio_bh_private; | |
2325 | bh->b_end_io = block->orig_bio_bh_end_io.bh; | |
2326 | block->is_iodone = 1; /* for FLUSH, this releases the block */ | |
2327 | bh->b_end_io(bh, uptodate); | |
2328 | } | |
2329 | ||
2330 | static int btrfsic_process_written_superblock( | |
2331 | struct btrfsic_state *state, | |
2332 | struct btrfsic_block *const superblock, | |
2333 | struct btrfs_super_block *const super_hdr) | |
2334 | { | |
2335 | int pass; | |
2336 | ||
2337 | superblock->generation = btrfs_super_generation(super_hdr); | |
2338 | if (!(superblock->generation > state->max_superblock_generation || | |
2339 | 0 == state->max_superblock_generation)) { | |
2340 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
2341 | printk(KERN_INFO | |
2342 | "btrfsic: superblock @%llu (%s/%llu/%d)" | |
2343 | " with old gen %llu <= %llu\n", | |
c1c9ff7c | 2344 | superblock->logical_bytenr, |
5db02760 | 2345 | superblock->dev_state->name, |
c1c9ff7c | 2346 | superblock->dev_bytenr, superblock->mirror_num, |
5db02760 | 2347 | btrfs_super_generation(super_hdr), |
5db02760 SB |
2348 | state->max_superblock_generation); |
2349 | } else { | |
2350 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
2351 | printk(KERN_INFO | |
2352 | "btrfsic: got new superblock @%llu (%s/%llu/%d)" | |
2353 | " with new gen %llu > %llu\n", | |
c1c9ff7c | 2354 | superblock->logical_bytenr, |
5db02760 | 2355 | superblock->dev_state->name, |
c1c9ff7c | 2356 | superblock->dev_bytenr, superblock->mirror_num, |
5db02760 | 2357 | btrfs_super_generation(super_hdr), |
5db02760 SB |
2358 | state->max_superblock_generation); |
2359 | ||
2360 | state->max_superblock_generation = | |
2361 | btrfs_super_generation(super_hdr); | |
2362 | state->latest_superblock = superblock; | |
2363 | } | |
2364 | ||
2365 | for (pass = 0; pass < 3; pass++) { | |
2366 | int ret; | |
2367 | u64 next_bytenr; | |
2368 | struct btrfsic_block *next_block; | |
2369 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
2370 | struct btrfsic_block_link *l; | |
2371 | int num_copies; | |
2372 | int mirror_num; | |
2373 | const char *additional_string = NULL; | |
35a3621b | 2374 | struct btrfs_disk_key tmp_disk_key = {0}; |
5db02760 | 2375 | |
3cae210f QW |
2376 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2377 | BTRFS_ROOT_ITEM_KEY); | |
2378 | btrfs_set_disk_key_objectid(&tmp_disk_key, 0); | |
5db02760 SB |
2379 | |
2380 | switch (pass) { | |
2381 | case 0: | |
3cae210f QW |
2382 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2383 | BTRFS_ROOT_TREE_OBJECTID); | |
5db02760 SB |
2384 | additional_string = "root "; |
2385 | next_bytenr = btrfs_super_root(super_hdr); | |
2386 | if (state->print_mask & | |
2387 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2388 | printk(KERN_INFO "root@%llu\n", next_bytenr); |
5db02760 SB |
2389 | break; |
2390 | case 1: | |
3cae210f QW |
2391 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2392 | BTRFS_CHUNK_TREE_OBJECTID); | |
5db02760 SB |
2393 | additional_string = "chunk "; |
2394 | next_bytenr = btrfs_super_chunk_root(super_hdr); | |
2395 | if (state->print_mask & | |
2396 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2397 | printk(KERN_INFO "chunk@%llu\n", next_bytenr); |
5db02760 SB |
2398 | break; |
2399 | case 2: | |
3cae210f QW |
2400 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2401 | BTRFS_TREE_LOG_OBJECTID); | |
5db02760 SB |
2402 | additional_string = "log "; |
2403 | next_bytenr = btrfs_super_log_root(super_hdr); | |
2404 | if (0 == next_bytenr) | |
2405 | continue; | |
2406 | if (state->print_mask & | |
2407 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2408 | printk(KERN_INFO "log@%llu\n", next_bytenr); |
5db02760 SB |
2409 | break; |
2410 | } | |
2411 | ||
2412 | num_copies = | |
5d964051 | 2413 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 2414 | next_bytenr, BTRFS_SUPER_INFO_SIZE); |
5db02760 SB |
2415 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
2416 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 2417 | next_bytenr, num_copies); |
5db02760 SB |
2418 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
2419 | int was_created; | |
2420 | ||
2421 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2422 | printk(KERN_INFO | |
2423 | "btrfsic_process_written_superblock(" | |
2424 | "mirror_num=%d)\n", mirror_num); | |
e06baab4 SB |
2425 | ret = btrfsic_map_block(state, next_bytenr, |
2426 | BTRFS_SUPER_INFO_SIZE, | |
5db02760 SB |
2427 | &tmp_next_block_ctx, |
2428 | mirror_num); | |
2429 | if (ret) { | |
2430 | printk(KERN_INFO | |
2431 | "btrfsic: btrfsic_map_block(@%llu," | |
2432 | " mirror=%d) failed!\n", | |
c1c9ff7c | 2433 | next_bytenr, mirror_num); |
5db02760 SB |
2434 | return -1; |
2435 | } | |
2436 | ||
2437 | next_block = btrfsic_block_lookup_or_add( | |
2438 | state, | |
2439 | &tmp_next_block_ctx, | |
2440 | additional_string, | |
2441 | 1, 0, 1, | |
2442 | mirror_num, | |
2443 | &was_created); | |
2444 | if (NULL == next_block) { | |
2445 | printk(KERN_INFO | |
2446 | "btrfsic: error, kmalloc failed!\n"); | |
2447 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
2448 | return -1; | |
2449 | } | |
2450 | ||
2451 | next_block->disk_key = tmp_disk_key; | |
2452 | if (was_created) | |
2453 | next_block->generation = | |
2454 | BTRFSIC_GENERATION_UNKNOWN; | |
2455 | l = btrfsic_block_link_lookup_or_add( | |
2456 | state, | |
2457 | &tmp_next_block_ctx, | |
2458 | next_block, | |
2459 | superblock, | |
2460 | BTRFSIC_GENERATION_UNKNOWN); | |
2461 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
2462 | if (NULL == l) | |
2463 | return -1; | |
2464 | } | |
2465 | } | |
2466 | ||
fae7f21c | 2467 | if (WARN_ON(-1 == btrfsic_check_all_ref_blocks(state, superblock, 0))) |
5db02760 | 2468 | btrfsic_dump_tree(state); |
5db02760 SB |
2469 | |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state, | |
2474 | struct btrfsic_block *const block, | |
2475 | int recursion_level) | |
2476 | { | |
2477 | struct list_head *elem_ref_to; | |
2478 | int ret = 0; | |
2479 | ||
2480 | if (recursion_level >= 3 + BTRFS_MAX_LEVEL) { | |
2481 | /* | |
2482 | * Note that this situation can happen and does not | |
2483 | * indicate an error in regular cases. It happens | |
2484 | * when disk blocks are freed and later reused. | |
2485 | * The check-integrity module is not aware of any | |
2486 | * block free operations, it just recognizes block | |
2487 | * write operations. Therefore it keeps the linkage | |
2488 | * information for a block until a block is | |
2489 | * rewritten. This can temporarily cause incorrect | |
2490 | * and even circular linkage informations. This | |
2491 | * causes no harm unless such blocks are referenced | |
2492 | * by the most recent super block. | |
2493 | */ | |
2494 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2495 | printk(KERN_INFO | |
2496 | "btrfsic: abort cyclic linkage (case 1).\n"); | |
2497 | ||
2498 | return ret; | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * This algorithm is recursive because the amount of used stack | |
2503 | * space is very small and the max recursion depth is limited. | |
2504 | */ | |
2505 | list_for_each(elem_ref_to, &block->ref_to_list) { | |
2506 | const struct btrfsic_block_link *const l = | |
2507 | list_entry(elem_ref_to, struct btrfsic_block_link, | |
2508 | node_ref_to); | |
2509 | ||
2510 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2511 | printk(KERN_INFO | |
2512 | "rl=%d, %c @%llu (%s/%llu/%d)" | |
2513 | " %u* refers to %c @%llu (%s/%llu/%d)\n", | |
2514 | recursion_level, | |
2515 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2516 | block->logical_bytenr, block->dev_state->name, |
2517 | block->dev_bytenr, block->mirror_num, | |
5db02760 SB |
2518 | l->ref_cnt, |
2519 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2520 | l->block_ref_to->logical_bytenr, |
2521 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2522 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2523 | l->block_ref_to->mirror_num); |
2524 | if (l->block_ref_to->never_written) { | |
2525 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2526 | " which references block %c @%llu (%s/%llu/%d)" | |
2527 | " which is never written!\n", | |
2528 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2529 | l->block_ref_to->logical_bytenr, |
2530 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2531 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2532 | l->block_ref_to->mirror_num); |
2533 | ret = -1; | |
2534 | } else if (!l->block_ref_to->is_iodone) { | |
2535 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2536 | " which references block %c @%llu (%s/%llu/%d)" | |
2537 | " which is not yet iodone!\n", | |
2538 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2539 | l->block_ref_to->logical_bytenr, |
2540 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2541 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2542 | l->block_ref_to->mirror_num); |
2543 | ret = -1; | |
62856a9b SB |
2544 | } else if (l->block_ref_to->iodone_w_error) { |
2545 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2546 | " which references block %c @%llu (%s/%llu/%d)" | |
2547 | " which has write error!\n", | |
2548 | btrfsic_get_block_type(state, l->block_ref_to), | |
62856a9b SB |
2549 | l->block_ref_to->logical_bytenr, |
2550 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2551 | l->block_ref_to->dev_bytenr, |
62856a9b SB |
2552 | l->block_ref_to->mirror_num); |
2553 | ret = -1; | |
5db02760 SB |
2554 | } else if (l->parent_generation != |
2555 | l->block_ref_to->generation && | |
2556 | BTRFSIC_GENERATION_UNKNOWN != | |
2557 | l->parent_generation && | |
2558 | BTRFSIC_GENERATION_UNKNOWN != | |
2559 | l->block_ref_to->generation) { | |
2560 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2561 | " which references block %c @%llu (%s/%llu/%d)" | |
2562 | " with generation %llu !=" | |
2563 | " parent generation %llu!\n", | |
2564 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2565 | l->block_ref_to->logical_bytenr, |
2566 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2567 | l->block_ref_to->dev_bytenr, |
5db02760 | 2568 | l->block_ref_to->mirror_num, |
c1c9ff7c GU |
2569 | l->block_ref_to->generation, |
2570 | l->parent_generation); | |
5db02760 SB |
2571 | ret = -1; |
2572 | } else if (l->block_ref_to->flush_gen > | |
2573 | l->block_ref_to->dev_state->last_flush_gen) { | |
2574 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2575 | " which references block %c @%llu (%s/%llu/%d)" | |
2576 | " which is not flushed out of disk's write cache" | |
2577 | " (block flush_gen=%llu," | |
2578 | " dev->flush_gen=%llu)!\n", | |
2579 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2580 | l->block_ref_to->logical_bytenr, |
2581 | l->block_ref_to->dev_state->name, | |
c1c9ff7c GU |
2582 | l->block_ref_to->dev_bytenr, |
2583 | l->block_ref_to->mirror_num, block->flush_gen, | |
5db02760 SB |
2584 | l->block_ref_to->dev_state->last_flush_gen); |
2585 | ret = -1; | |
2586 | } else if (-1 == btrfsic_check_all_ref_blocks(state, | |
2587 | l->block_ref_to, | |
2588 | recursion_level + | |
2589 | 1)) { | |
2590 | ret = -1; | |
2591 | } | |
2592 | } | |
2593 | ||
2594 | return ret; | |
2595 | } | |
2596 | ||
2597 | static int btrfsic_is_block_ref_by_superblock( | |
2598 | const struct btrfsic_state *state, | |
2599 | const struct btrfsic_block *block, | |
2600 | int recursion_level) | |
2601 | { | |
2602 | struct list_head *elem_ref_from; | |
2603 | ||
2604 | if (recursion_level >= 3 + BTRFS_MAX_LEVEL) { | |
2605 | /* refer to comment at "abort cyclic linkage (case 1)" */ | |
2606 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2607 | printk(KERN_INFO | |
2608 | "btrfsic: abort cyclic linkage (case 2).\n"); | |
2609 | ||
2610 | return 0; | |
2611 | } | |
2612 | ||
2613 | /* | |
2614 | * This algorithm is recursive because the amount of used stack space | |
2615 | * is very small and the max recursion depth is limited. | |
2616 | */ | |
2617 | list_for_each(elem_ref_from, &block->ref_from_list) { | |
2618 | const struct btrfsic_block_link *const l = | |
2619 | list_entry(elem_ref_from, struct btrfsic_block_link, | |
2620 | node_ref_from); | |
2621 | ||
2622 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2623 | printk(KERN_INFO | |
2624 | "rl=%d, %c @%llu (%s/%llu/%d)" | |
2625 | " is ref %u* from %c @%llu (%s/%llu/%d)\n", | |
2626 | recursion_level, | |
2627 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2628 | block->logical_bytenr, block->dev_state->name, |
2629 | block->dev_bytenr, block->mirror_num, | |
5db02760 SB |
2630 | l->ref_cnt, |
2631 | btrfsic_get_block_type(state, l->block_ref_from), | |
5db02760 SB |
2632 | l->block_ref_from->logical_bytenr, |
2633 | l->block_ref_from->dev_state->name, | |
5db02760 SB |
2634 | l->block_ref_from->dev_bytenr, |
2635 | l->block_ref_from->mirror_num); | |
2636 | if (l->block_ref_from->is_superblock && | |
2637 | state->latest_superblock->dev_bytenr == | |
2638 | l->block_ref_from->dev_bytenr && | |
2639 | state->latest_superblock->dev_state->bdev == | |
2640 | l->block_ref_from->dev_state->bdev) | |
2641 | return 1; | |
2642 | else if (btrfsic_is_block_ref_by_superblock(state, | |
2643 | l->block_ref_from, | |
2644 | recursion_level + | |
2645 | 1)) | |
2646 | return 1; | |
2647 | } | |
2648 | ||
2649 | return 0; | |
2650 | } | |
2651 | ||
2652 | static void btrfsic_print_add_link(const struct btrfsic_state *state, | |
2653 | const struct btrfsic_block_link *l) | |
2654 | { | |
2655 | printk(KERN_INFO | |
2656 | "Add %u* link from %c @%llu (%s/%llu/%d)" | |
2657 | " to %c @%llu (%s/%llu/%d).\n", | |
2658 | l->ref_cnt, | |
2659 | btrfsic_get_block_type(state, l->block_ref_from), | |
c1c9ff7c | 2660 | l->block_ref_from->logical_bytenr, |
5db02760 | 2661 | l->block_ref_from->dev_state->name, |
c1c9ff7c | 2662 | l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num, |
5db02760 | 2663 | btrfsic_get_block_type(state, l->block_ref_to), |
c1c9ff7c GU |
2664 | l->block_ref_to->logical_bytenr, |
2665 | l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr, | |
5db02760 SB |
2666 | l->block_ref_to->mirror_num); |
2667 | } | |
2668 | ||
2669 | static void btrfsic_print_rem_link(const struct btrfsic_state *state, | |
2670 | const struct btrfsic_block_link *l) | |
2671 | { | |
2672 | printk(KERN_INFO | |
2673 | "Rem %u* link from %c @%llu (%s/%llu/%d)" | |
2674 | " to %c @%llu (%s/%llu/%d).\n", | |
2675 | l->ref_cnt, | |
2676 | btrfsic_get_block_type(state, l->block_ref_from), | |
c1c9ff7c | 2677 | l->block_ref_from->logical_bytenr, |
5db02760 | 2678 | l->block_ref_from->dev_state->name, |
c1c9ff7c | 2679 | l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num, |
5db02760 | 2680 | btrfsic_get_block_type(state, l->block_ref_to), |
c1c9ff7c GU |
2681 | l->block_ref_to->logical_bytenr, |
2682 | l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr, | |
5db02760 SB |
2683 | l->block_ref_to->mirror_num); |
2684 | } | |
2685 | ||
2686 | static char btrfsic_get_block_type(const struct btrfsic_state *state, | |
2687 | const struct btrfsic_block *block) | |
2688 | { | |
2689 | if (block->is_superblock && | |
2690 | state->latest_superblock->dev_bytenr == block->dev_bytenr && | |
2691 | state->latest_superblock->dev_state->bdev == block->dev_state->bdev) | |
2692 | return 'S'; | |
2693 | else if (block->is_superblock) | |
2694 | return 's'; | |
2695 | else if (block->is_metadata) | |
2696 | return 'M'; | |
2697 | else | |
2698 | return 'D'; | |
2699 | } | |
2700 | ||
2701 | static void btrfsic_dump_tree(const struct btrfsic_state *state) | |
2702 | { | |
2703 | btrfsic_dump_tree_sub(state, state->latest_superblock, 0); | |
2704 | } | |
2705 | ||
2706 | static void btrfsic_dump_tree_sub(const struct btrfsic_state *state, | |
2707 | const struct btrfsic_block *block, | |
2708 | int indent_level) | |
2709 | { | |
2710 | struct list_head *elem_ref_to; | |
2711 | int indent_add; | |
2712 | static char buf[80]; | |
2713 | int cursor_position; | |
2714 | ||
2715 | /* | |
2716 | * Should better fill an on-stack buffer with a complete line and | |
2717 | * dump it at once when it is time to print a newline character. | |
2718 | */ | |
2719 | ||
2720 | /* | |
2721 | * This algorithm is recursive because the amount of used stack space | |
2722 | * is very small and the max recursion depth is limited. | |
2723 | */ | |
2724 | indent_add = sprintf(buf, "%c-%llu(%s/%llu/%d)", | |
2725 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2726 | block->logical_bytenr, block->dev_state->name, |
2727 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2728 | if (indent_level + indent_add > BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) { |
2729 | printk("[...]\n"); | |
2730 | return; | |
2731 | } | |
2732 | printk(buf); | |
2733 | indent_level += indent_add; | |
2734 | if (list_empty(&block->ref_to_list)) { | |
2735 | printk("\n"); | |
2736 | return; | |
2737 | } | |
2738 | if (block->mirror_num > 1 && | |
2739 | !(state->print_mask & BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS)) { | |
2740 | printk(" [...]\n"); | |
2741 | return; | |
2742 | } | |
2743 | ||
2744 | cursor_position = indent_level; | |
2745 | list_for_each(elem_ref_to, &block->ref_to_list) { | |
2746 | const struct btrfsic_block_link *const l = | |
2747 | list_entry(elem_ref_to, struct btrfsic_block_link, | |
2748 | node_ref_to); | |
2749 | ||
2750 | while (cursor_position < indent_level) { | |
2751 | printk(" "); | |
2752 | cursor_position++; | |
2753 | } | |
2754 | if (l->ref_cnt > 1) | |
2755 | indent_add = sprintf(buf, " %d*--> ", l->ref_cnt); | |
2756 | else | |
2757 | indent_add = sprintf(buf, " --> "); | |
2758 | if (indent_level + indent_add > | |
2759 | BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) { | |
2760 | printk("[...]\n"); | |
2761 | cursor_position = 0; | |
2762 | continue; | |
2763 | } | |
2764 | ||
2765 | printk(buf); | |
2766 | ||
2767 | btrfsic_dump_tree_sub(state, l->block_ref_to, | |
2768 | indent_level + indent_add); | |
2769 | cursor_position = 0; | |
2770 | } | |
2771 | } | |
2772 | ||
2773 | static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add( | |
2774 | struct btrfsic_state *state, | |
2775 | struct btrfsic_block_data_ctx *next_block_ctx, | |
2776 | struct btrfsic_block *next_block, | |
2777 | struct btrfsic_block *from_block, | |
2778 | u64 parent_generation) | |
2779 | { | |
2780 | struct btrfsic_block_link *l; | |
2781 | ||
2782 | l = btrfsic_block_link_hashtable_lookup(next_block_ctx->dev->bdev, | |
2783 | next_block_ctx->dev_bytenr, | |
2784 | from_block->dev_state->bdev, | |
2785 | from_block->dev_bytenr, | |
2786 | &state->block_link_hashtable); | |
2787 | if (NULL == l) { | |
2788 | l = btrfsic_block_link_alloc(); | |
2789 | if (NULL == l) { | |
2790 | printk(KERN_INFO | |
2791 | "btrfsic: error, kmalloc" " failed!\n"); | |
2792 | return NULL; | |
2793 | } | |
2794 | ||
2795 | l->block_ref_to = next_block; | |
2796 | l->block_ref_from = from_block; | |
2797 | l->ref_cnt = 1; | |
2798 | l->parent_generation = parent_generation; | |
2799 | ||
2800 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2801 | btrfsic_print_add_link(state, l); | |
2802 | ||
2803 | list_add(&l->node_ref_to, &from_block->ref_to_list); | |
2804 | list_add(&l->node_ref_from, &next_block->ref_from_list); | |
2805 | ||
2806 | btrfsic_block_link_hashtable_add(l, | |
2807 | &state->block_link_hashtable); | |
2808 | } else { | |
2809 | l->ref_cnt++; | |
2810 | l->parent_generation = parent_generation; | |
2811 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2812 | btrfsic_print_add_link(state, l); | |
2813 | } | |
2814 | ||
2815 | return l; | |
2816 | } | |
2817 | ||
2818 | static struct btrfsic_block *btrfsic_block_lookup_or_add( | |
2819 | struct btrfsic_state *state, | |
2820 | struct btrfsic_block_data_ctx *block_ctx, | |
2821 | const char *additional_string, | |
2822 | int is_metadata, | |
2823 | int is_iodone, | |
2824 | int never_written, | |
2825 | int mirror_num, | |
2826 | int *was_created) | |
2827 | { | |
2828 | struct btrfsic_block *block; | |
2829 | ||
2830 | block = btrfsic_block_hashtable_lookup(block_ctx->dev->bdev, | |
2831 | block_ctx->dev_bytenr, | |
2832 | &state->block_hashtable); | |
2833 | if (NULL == block) { | |
2834 | struct btrfsic_dev_state *dev_state; | |
2835 | ||
2836 | block = btrfsic_block_alloc(); | |
2837 | if (NULL == block) { | |
2838 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
2839 | return NULL; | |
2840 | } | |
2841 | dev_state = btrfsic_dev_state_lookup(block_ctx->dev->bdev); | |
2842 | if (NULL == dev_state) { | |
2843 | printk(KERN_INFO | |
2844 | "btrfsic: error, lookup dev_state failed!\n"); | |
2845 | btrfsic_block_free(block); | |
2846 | return NULL; | |
2847 | } | |
2848 | block->dev_state = dev_state; | |
2849 | block->dev_bytenr = block_ctx->dev_bytenr; | |
2850 | block->logical_bytenr = block_ctx->start; | |
2851 | block->is_metadata = is_metadata; | |
2852 | block->is_iodone = is_iodone; | |
2853 | block->never_written = never_written; | |
2854 | block->mirror_num = mirror_num; | |
2855 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2856 | printk(KERN_INFO | |
2857 | "New %s%c-block @%llu (%s/%llu/%d)\n", | |
2858 | additional_string, | |
2859 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2860 | block->logical_bytenr, dev_state->name, |
2861 | block->dev_bytenr, mirror_num); | |
5db02760 SB |
2862 | list_add(&block->all_blocks_node, &state->all_blocks_list); |
2863 | btrfsic_block_hashtable_add(block, &state->block_hashtable); | |
2864 | if (NULL != was_created) | |
2865 | *was_created = 1; | |
2866 | } else { | |
2867 | if (NULL != was_created) | |
2868 | *was_created = 0; | |
2869 | } | |
2870 | ||
2871 | return block; | |
2872 | } | |
2873 | ||
2874 | static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state, | |
2875 | u64 bytenr, | |
2876 | struct btrfsic_dev_state *dev_state, | |
e06baab4 | 2877 | u64 dev_bytenr) |
5db02760 SB |
2878 | { |
2879 | int num_copies; | |
2880 | int mirror_num; | |
2881 | int ret; | |
2882 | struct btrfsic_block_data_ctx block_ctx; | |
2883 | int match = 0; | |
2884 | ||
5d964051 | 2885 | num_copies = btrfs_num_copies(state->root->fs_info, |
e06baab4 | 2886 | bytenr, state->metablock_size); |
5db02760 SB |
2887 | |
2888 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { | |
e06baab4 | 2889 | ret = btrfsic_map_block(state, bytenr, state->metablock_size, |
5db02760 SB |
2890 | &block_ctx, mirror_num); |
2891 | if (ret) { | |
2892 | printk(KERN_INFO "btrfsic:" | |
2893 | " btrfsic_map_block(logical @%llu," | |
2894 | " mirror %d) failed!\n", | |
c1c9ff7c | 2895 | bytenr, mirror_num); |
5db02760 SB |
2896 | continue; |
2897 | } | |
2898 | ||
2899 | if (dev_state->bdev == block_ctx.dev->bdev && | |
2900 | dev_bytenr == block_ctx.dev_bytenr) { | |
2901 | match++; | |
2902 | btrfsic_release_block_ctx(&block_ctx); | |
2903 | break; | |
2904 | } | |
2905 | btrfsic_release_block_ctx(&block_ctx); | |
2906 | } | |
2907 | ||
fae7f21c | 2908 | if (WARN_ON(!match)) { |
5db02760 SB |
2909 | printk(KERN_INFO "btrfs: attempt to write M-block which contains logical bytenr that doesn't map to dev+physical bytenr of submit_bio," |
2910 | " buffer->log_bytenr=%llu, submit_bio(bdev=%s," | |
2911 | " phys_bytenr=%llu)!\n", | |
c1c9ff7c | 2912 | bytenr, dev_state->name, dev_bytenr); |
5db02760 | 2913 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
e06baab4 SB |
2914 | ret = btrfsic_map_block(state, bytenr, |
2915 | state->metablock_size, | |
5db02760 SB |
2916 | &block_ctx, mirror_num); |
2917 | if (ret) | |
2918 | continue; | |
2919 | ||
2920 | printk(KERN_INFO "Read logical bytenr @%llu maps to" | |
2921 | " (%s/%llu/%d)\n", | |
c1c9ff7c GU |
2922 | bytenr, block_ctx.dev->name, |
2923 | block_ctx.dev_bytenr, mirror_num); | |
5db02760 | 2924 | } |
5db02760 SB |
2925 | } |
2926 | } | |
2927 | ||
2928 | static struct btrfsic_dev_state *btrfsic_dev_state_lookup( | |
2929 | struct block_device *bdev) | |
2930 | { | |
2931 | struct btrfsic_dev_state *ds; | |
2932 | ||
2933 | ds = btrfsic_dev_state_hashtable_lookup(bdev, | |
2934 | &btrfsic_dev_state_hashtable); | |
2935 | return ds; | |
2936 | } | |
2937 | ||
2938 | int btrfsic_submit_bh(int rw, struct buffer_head *bh) | |
2939 | { | |
2940 | struct btrfsic_dev_state *dev_state; | |
2941 | ||
2942 | if (!btrfsic_is_initialized) | |
2943 | return submit_bh(rw, bh); | |
2944 | ||
2945 | mutex_lock(&btrfsic_mutex); | |
2946 | /* since btrfsic_submit_bh() might also be called before | |
2947 | * btrfsic_mount(), this might return NULL */ | |
2948 | dev_state = btrfsic_dev_state_lookup(bh->b_bdev); | |
2949 | ||
2950 | /* Only called to write the superblock (incl. FLUSH/FUA) */ | |
2951 | if (NULL != dev_state && | |
2952 | (rw & WRITE) && bh->b_size > 0) { | |
2953 | u64 dev_bytenr; | |
2954 | ||
2955 | dev_bytenr = 4096 * bh->b_blocknr; | |
2956 | if (dev_state->state->print_mask & | |
2957 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
2958 | printk(KERN_INFO | |
fce29364 | 2959 | "submit_bh(rw=0x%x, blocknr=%llu (bytenr %llu)," |
8d78eb16 | 2960 | " size=%zu, data=%p, bdev=%p)\n", |
fce29364 | 2961 | rw, (unsigned long long)bh->b_blocknr, |
8d78eb16 | 2962 | dev_bytenr, bh->b_size, bh->b_data, bh->b_bdev); |
5db02760 | 2963 | btrfsic_process_written_block(dev_state, dev_bytenr, |
e06baab4 | 2964 | &bh->b_data, 1, NULL, |
5db02760 SB |
2965 | NULL, bh, rw); |
2966 | } else if (NULL != dev_state && (rw & REQ_FLUSH)) { | |
2967 | if (dev_state->state->print_mask & | |
2968 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
2969 | printk(KERN_INFO | |
e06baab4 | 2970 | "submit_bh(rw=0x%x FLUSH, bdev=%p)\n", |
5db02760 SB |
2971 | rw, bh->b_bdev); |
2972 | if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) { | |
2973 | if ((dev_state->state->print_mask & | |
2974 | (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | | |
2975 | BTRFSIC_PRINT_MASK_VERBOSE))) | |
2976 | printk(KERN_INFO | |
2977 | "btrfsic_submit_bh(%s) with FLUSH" | |
2978 | " but dummy block already in use" | |
2979 | " (ignored)!\n", | |
2980 | dev_state->name); | |
2981 | } else { | |
2982 | struct btrfsic_block *const block = | |
2983 | &dev_state->dummy_block_for_bio_bh_flush; | |
2984 | ||
2985 | block->is_iodone = 0; | |
2986 | block->never_written = 0; | |
2987 | block->iodone_w_error = 0; | |
2988 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2989 | block->submit_bio_bh_rw = rw; | |
2990 | block->orig_bio_bh_private = bh->b_private; | |
2991 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2992 | block->next_in_same_bio = NULL; | |
2993 | bh->b_private = block; | |
2994 | bh->b_end_io = btrfsic_bh_end_io; | |
2995 | } | |
2996 | } | |
2997 | mutex_unlock(&btrfsic_mutex); | |
2998 | return submit_bh(rw, bh); | |
2999 | } | |
3000 | ||
33879d45 | 3001 | static void __btrfsic_submit_bio(int rw, struct bio *bio) |
5db02760 SB |
3002 | { |
3003 | struct btrfsic_dev_state *dev_state; | |
3004 | ||
33879d45 | 3005 | if (!btrfsic_is_initialized) |
5db02760 | 3006 | return; |
5db02760 SB |
3007 | |
3008 | mutex_lock(&btrfsic_mutex); | |
3009 | /* since btrfsic_submit_bio() is also called before | |
3010 | * btrfsic_mount(), this might return NULL */ | |
3011 | dev_state = btrfsic_dev_state_lookup(bio->bi_bdev); | |
3012 | if (NULL != dev_state && | |
3013 | (rw & WRITE) && NULL != bio->bi_io_vec) { | |
3014 | unsigned int i; | |
3015 | u64 dev_bytenr; | |
56d140f5 | 3016 | u64 cur_bytenr; |
5db02760 | 3017 | int bio_is_patched; |
e06baab4 | 3018 | char **mapped_datav; |
5db02760 | 3019 | |
4f024f37 | 3020 | dev_bytenr = 512 * bio->bi_iter.bi_sector; |
5db02760 SB |
3021 | bio_is_patched = 0; |
3022 | if (dev_state->state->print_mask & | |
3023 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
3024 | printk(KERN_INFO | |
3025 | "submit_bio(rw=0x%x, bi_vcnt=%u," | |
fce29364 GU |
3026 | " bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n", |
3027 | rw, bio->bi_vcnt, | |
4f024f37 KO |
3028 | (unsigned long long)bio->bi_iter.bi_sector, |
3029 | dev_bytenr, bio->bi_bdev); | |
5db02760 | 3030 | |
e06baab4 SB |
3031 | mapped_datav = kmalloc(sizeof(*mapped_datav) * bio->bi_vcnt, |
3032 | GFP_NOFS); | |
3033 | if (!mapped_datav) | |
3034 | goto leave; | |
56d140f5 | 3035 | cur_bytenr = dev_bytenr; |
5db02760 | 3036 | for (i = 0; i < bio->bi_vcnt; i++) { |
e06baab4 SB |
3037 | BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_CACHE_SIZE); |
3038 | mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page); | |
3039 | if (!mapped_datav[i]) { | |
3040 | while (i > 0) { | |
3041 | i--; | |
3042 | kunmap(bio->bi_io_vec[i].bv_page); | |
3043 | } | |
3044 | kfree(mapped_datav); | |
3045 | goto leave; | |
3046 | } | |
56d140f5 SB |
3047 | if (dev_state->state->print_mask & |
3048 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE) | |
5db02760 | 3049 | printk(KERN_INFO |
56d140f5 SB |
3050 | "#%u: bytenr=%llu, len=%u, offset=%u\n", |
3051 | i, cur_bytenr, bio->bi_io_vec[i].bv_len, | |
5db02760 | 3052 | bio->bi_io_vec[i].bv_offset); |
56d140f5 | 3053 | cur_bytenr += bio->bi_io_vec[i].bv_len; |
e06baab4 SB |
3054 | } |
3055 | btrfsic_process_written_block(dev_state, dev_bytenr, | |
3056 | mapped_datav, bio->bi_vcnt, | |
3057 | bio, &bio_is_patched, | |
3058 | NULL, rw); | |
3059 | while (i > 0) { | |
3060 | i--; | |
5db02760 | 3061 | kunmap(bio->bi_io_vec[i].bv_page); |
5db02760 | 3062 | } |
e06baab4 | 3063 | kfree(mapped_datav); |
5db02760 SB |
3064 | } else if (NULL != dev_state && (rw & REQ_FLUSH)) { |
3065 | if (dev_state->state->print_mask & | |
3066 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
3067 | printk(KERN_INFO | |
e06baab4 | 3068 | "submit_bio(rw=0x%x FLUSH, bdev=%p)\n", |
5db02760 SB |
3069 | rw, bio->bi_bdev); |
3070 | if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) { | |
3071 | if ((dev_state->state->print_mask & | |
3072 | (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | | |
3073 | BTRFSIC_PRINT_MASK_VERBOSE))) | |
3074 | printk(KERN_INFO | |
3075 | "btrfsic_submit_bio(%s) with FLUSH" | |
3076 | " but dummy block already in use" | |
3077 | " (ignored)!\n", | |
3078 | dev_state->name); | |
3079 | } else { | |
3080 | struct btrfsic_block *const block = | |
3081 | &dev_state->dummy_block_for_bio_bh_flush; | |
3082 | ||
3083 | block->is_iodone = 0; | |
3084 | block->never_written = 0; | |
3085 | block->iodone_w_error = 0; | |
3086 | block->flush_gen = dev_state->last_flush_gen + 1; | |
3087 | block->submit_bio_bh_rw = rw; | |
3088 | block->orig_bio_bh_private = bio->bi_private; | |
3089 | block->orig_bio_bh_end_io.bio = bio->bi_end_io; | |
3090 | block->next_in_same_bio = NULL; | |
3091 | bio->bi_private = block; | |
3092 | bio->bi_end_io = btrfsic_bio_end_io; | |
3093 | } | |
3094 | } | |
e06baab4 | 3095 | leave: |
5db02760 | 3096 | mutex_unlock(&btrfsic_mutex); |
33879d45 | 3097 | } |
5db02760 | 3098 | |
33879d45 KO |
3099 | void btrfsic_submit_bio(int rw, struct bio *bio) |
3100 | { | |
3101 | __btrfsic_submit_bio(rw, bio); | |
5db02760 SB |
3102 | submit_bio(rw, bio); |
3103 | } | |
3104 | ||
33879d45 KO |
3105 | int btrfsic_submit_bio_wait(int rw, struct bio *bio) |
3106 | { | |
3107 | __btrfsic_submit_bio(rw, bio); | |
3108 | return submit_bio_wait(rw, bio); | |
3109 | } | |
3110 | ||
5db02760 SB |
3111 | int btrfsic_mount(struct btrfs_root *root, |
3112 | struct btrfs_fs_devices *fs_devices, | |
3113 | int including_extent_data, u32 print_mask) | |
3114 | { | |
3115 | int ret; | |
3116 | struct btrfsic_state *state; | |
3117 | struct list_head *dev_head = &fs_devices->devices; | |
3118 | struct btrfs_device *device; | |
3119 | ||
e06baab4 SB |
3120 | if (root->nodesize != root->leafsize) { |
3121 | printk(KERN_INFO | |
3122 | "btrfsic: cannot handle nodesize %d != leafsize %d!\n", | |
3123 | root->nodesize, root->leafsize); | |
3124 | return -1; | |
3125 | } | |
3126 | if (root->nodesize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3127 | printk(KERN_INFO | |
3128 | "btrfsic: cannot handle nodesize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3129 | root->nodesize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3130 | return -1; |
3131 | } | |
3132 | if (root->leafsize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3133 | printk(KERN_INFO | |
3134 | "btrfsic: cannot handle leafsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3135 | root->leafsize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3136 | return -1; |
3137 | } | |
3138 | if (root->sectorsize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3139 | printk(KERN_INFO | |
3140 | "btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3141 | root->sectorsize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3142 | return -1; |
3143 | } | |
5db02760 SB |
3144 | state = kzalloc(sizeof(*state), GFP_NOFS); |
3145 | if (NULL == state) { | |
3146 | printk(KERN_INFO "btrfs check-integrity: kmalloc() failed!\n"); | |
3147 | return -1; | |
3148 | } | |
3149 | ||
3150 | if (!btrfsic_is_initialized) { | |
3151 | mutex_init(&btrfsic_mutex); | |
3152 | btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable); | |
3153 | btrfsic_is_initialized = 1; | |
3154 | } | |
3155 | mutex_lock(&btrfsic_mutex); | |
3156 | state->root = root; | |
3157 | state->print_mask = print_mask; | |
3158 | state->include_extent_data = including_extent_data; | |
3159 | state->csum_size = 0; | |
e06baab4 SB |
3160 | state->metablock_size = root->nodesize; |
3161 | state->datablock_size = root->sectorsize; | |
5db02760 SB |
3162 | INIT_LIST_HEAD(&state->all_blocks_list); |
3163 | btrfsic_block_hashtable_init(&state->block_hashtable); | |
3164 | btrfsic_block_link_hashtable_init(&state->block_link_hashtable); | |
3165 | state->max_superblock_generation = 0; | |
3166 | state->latest_superblock = NULL; | |
3167 | ||
3168 | list_for_each_entry(device, dev_head, dev_list) { | |
3169 | struct btrfsic_dev_state *ds; | |
3170 | char *p; | |
3171 | ||
3172 | if (!device->bdev || !device->name) | |
3173 | continue; | |
3174 | ||
3175 | ds = btrfsic_dev_state_alloc(); | |
3176 | if (NULL == ds) { | |
3177 | printk(KERN_INFO | |
3178 | "btrfs check-integrity: kmalloc() failed!\n"); | |
3179 | mutex_unlock(&btrfsic_mutex); | |
3180 | return -1; | |
3181 | } | |
3182 | ds->bdev = device->bdev; | |
3183 | ds->state = state; | |
3184 | bdevname(ds->bdev, ds->name); | |
3185 | ds->name[BDEVNAME_SIZE - 1] = '\0'; | |
3186 | for (p = ds->name; *p != '\0'; p++); | |
3187 | while (p > ds->name && *p != '/') | |
3188 | p--; | |
3189 | if (*p == '/') | |
3190 | p++; | |
3191 | strlcpy(ds->name, p, sizeof(ds->name)); | |
3192 | btrfsic_dev_state_hashtable_add(ds, | |
3193 | &btrfsic_dev_state_hashtable); | |
3194 | } | |
3195 | ||
3196 | ret = btrfsic_process_superblock(state, fs_devices); | |
3197 | if (0 != ret) { | |
3198 | mutex_unlock(&btrfsic_mutex); | |
3199 | btrfsic_unmount(root, fs_devices); | |
3200 | return ret; | |
3201 | } | |
3202 | ||
3203 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_DATABASE) | |
3204 | btrfsic_dump_database(state); | |
3205 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_TREE) | |
3206 | btrfsic_dump_tree(state); | |
3207 | ||
3208 | mutex_unlock(&btrfsic_mutex); | |
3209 | return 0; | |
3210 | } | |
3211 | ||
3212 | void btrfsic_unmount(struct btrfs_root *root, | |
3213 | struct btrfs_fs_devices *fs_devices) | |
3214 | { | |
3215 | struct list_head *elem_all; | |
3216 | struct list_head *tmp_all; | |
3217 | struct btrfsic_state *state; | |
3218 | struct list_head *dev_head = &fs_devices->devices; | |
3219 | struct btrfs_device *device; | |
3220 | ||
3221 | if (!btrfsic_is_initialized) | |
3222 | return; | |
3223 | ||
3224 | mutex_lock(&btrfsic_mutex); | |
3225 | ||
3226 | state = NULL; | |
3227 | list_for_each_entry(device, dev_head, dev_list) { | |
3228 | struct btrfsic_dev_state *ds; | |
3229 | ||
3230 | if (!device->bdev || !device->name) | |
3231 | continue; | |
3232 | ||
3233 | ds = btrfsic_dev_state_hashtable_lookup( | |
3234 | device->bdev, | |
3235 | &btrfsic_dev_state_hashtable); | |
3236 | if (NULL != ds) { | |
3237 | state = ds->state; | |
3238 | btrfsic_dev_state_hashtable_remove(ds); | |
3239 | btrfsic_dev_state_free(ds); | |
3240 | } | |
3241 | } | |
3242 | ||
3243 | if (NULL == state) { | |
3244 | printk(KERN_INFO | |
3245 | "btrfsic: error, cannot find state information" | |
3246 | " on umount!\n"); | |
3247 | mutex_unlock(&btrfsic_mutex); | |
3248 | return; | |
3249 | } | |
3250 | ||
3251 | /* | |
3252 | * Don't care about keeping the lists' state up to date, | |
3253 | * just free all memory that was allocated dynamically. | |
3254 | * Free the blocks and the block_links. | |
3255 | */ | |
3256 | list_for_each_safe(elem_all, tmp_all, &state->all_blocks_list) { | |
3257 | struct btrfsic_block *const b_all = | |
3258 | list_entry(elem_all, struct btrfsic_block, | |
3259 | all_blocks_node); | |
3260 | struct list_head *elem_ref_to; | |
3261 | struct list_head *tmp_ref_to; | |
3262 | ||
3263 | list_for_each_safe(elem_ref_to, tmp_ref_to, | |
3264 | &b_all->ref_to_list) { | |
3265 | struct btrfsic_block_link *const l = | |
3266 | list_entry(elem_ref_to, | |
3267 | struct btrfsic_block_link, | |
3268 | node_ref_to); | |
3269 | ||
3270 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
3271 | btrfsic_print_rem_link(state, l); | |
3272 | ||
3273 | l->ref_cnt--; | |
3274 | if (0 == l->ref_cnt) | |
3275 | btrfsic_block_link_free(l); | |
3276 | } | |
3277 | ||
48235a68 | 3278 | if (b_all->is_iodone || b_all->never_written) |
5db02760 SB |
3279 | btrfsic_block_free(b_all); |
3280 | else | |
3281 | printk(KERN_INFO "btrfs: attempt to free %c-block" | |
3282 | " @%llu (%s/%llu/%d) on umount which is" | |
3283 | " not yet iodone!\n", | |
3284 | btrfsic_get_block_type(state, b_all), | |
c1c9ff7c GU |
3285 | b_all->logical_bytenr, b_all->dev_state->name, |
3286 | b_all->dev_bytenr, b_all->mirror_num); | |
5db02760 SB |
3287 | } |
3288 | ||
3289 | mutex_unlock(&btrfsic_mutex); | |
3290 | ||
3291 | kfree(state); | |
3292 | } |