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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. | |
80 | */ | |
81 | ||
82 | #include <linux/sched.h> | |
83 | #include <linux/slab.h> | |
84 | #include <linux/buffer_head.h> | |
85 | #include <linux/mutex.h> | |
86 | #include <linux/crc32c.h> | |
87 | #include <linux/genhd.h> | |
88 | #include <linux/blkdev.h> | |
89 | #include "ctree.h" | |
90 | #include "disk-io.h" | |
91 | #include "transaction.h" | |
92 | #include "extent_io.h" | |
5db02760 SB |
93 | #include "volumes.h" |
94 | #include "print-tree.h" | |
95 | #include "locking.h" | |
96 | #include "check-integrity.h" | |
606686ee | 97 | #include "rcu-string.h" |
5db02760 SB |
98 | |
99 | #define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000 | |
100 | #define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000 | |
101 | #define BTRFSIC_DEV2STATE_HASHTABLE_SIZE 0x100 | |
102 | #define BTRFSIC_BLOCK_MAGIC_NUMBER 0x14491051 | |
103 | #define BTRFSIC_BLOCK_LINK_MAGIC_NUMBER 0x11070807 | |
104 | #define BTRFSIC_DEV2STATE_MAGIC_NUMBER 0x20111530 | |
105 | #define BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER 20111300 | |
106 | #define BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL (200 - 6) /* in characters, | |
107 | * excluding " [...]" */ | |
5db02760 SB |
108 | #define BTRFSIC_GENERATION_UNKNOWN ((u64)-1) |
109 | ||
110 | /* | |
111 | * The definition of the bitmask fields for the print_mask. | |
112 | * They are specified with the mount option check_integrity_print_mask. | |
113 | */ | |
114 | #define BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE 0x00000001 | |
115 | #define BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION 0x00000002 | |
116 | #define BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE 0x00000004 | |
117 | #define BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE 0x00000008 | |
118 | #define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH 0x00000010 | |
119 | #define BTRFSIC_PRINT_MASK_END_IO_BIO_BH 0x00000020 | |
120 | #define BTRFSIC_PRINT_MASK_VERBOSE 0x00000040 | |
121 | #define BTRFSIC_PRINT_MASK_VERY_VERBOSE 0x00000080 | |
122 | #define BTRFSIC_PRINT_MASK_INITIAL_TREE 0x00000100 | |
123 | #define BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES 0x00000200 | |
124 | #define BTRFSIC_PRINT_MASK_INITIAL_DATABASE 0x00000400 | |
125 | #define BTRFSIC_PRINT_MASK_NUM_COPIES 0x00000800 | |
126 | #define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS 0x00001000 | |
127 | ||
128 | struct btrfsic_dev_state; | |
129 | struct btrfsic_state; | |
130 | ||
131 | struct btrfsic_block { | |
132 | u32 magic_num; /* only used for debug purposes */ | |
133 | unsigned int is_metadata:1; /* if it is meta-data, not data-data */ | |
134 | unsigned int is_superblock:1; /* if it is one of the superblocks */ | |
135 | unsigned int is_iodone:1; /* if is done by lower subsystem */ | |
136 | unsigned int iodone_w_error:1; /* error was indicated to endio */ | |
137 | unsigned int never_written:1; /* block was added because it was | |
138 | * referenced, not because it was | |
139 | * written */ | |
cb3806ec | 140 | unsigned int mirror_num; /* large enough to hold |
5db02760 SB |
141 | * BTRFS_SUPER_MIRROR_MAX */ |
142 | struct btrfsic_dev_state *dev_state; | |
143 | u64 dev_bytenr; /* key, physical byte num on disk */ | |
144 | u64 logical_bytenr; /* logical byte num on disk */ | |
145 | u64 generation; | |
146 | struct btrfs_disk_key disk_key; /* extra info to print in case of | |
147 | * issues, will not always be correct */ | |
148 | struct list_head collision_resolving_node; /* list node */ | |
149 | struct list_head all_blocks_node; /* list node */ | |
150 | ||
151 | /* the following two lists contain block_link items */ | |
152 | struct list_head ref_to_list; /* list */ | |
153 | struct list_head ref_from_list; /* list */ | |
154 | struct btrfsic_block *next_in_same_bio; | |
155 | void *orig_bio_bh_private; | |
156 | union { | |
157 | bio_end_io_t *bio; | |
158 | bh_end_io_t *bh; | |
159 | } orig_bio_bh_end_io; | |
160 | int submit_bio_bh_rw; | |
161 | u64 flush_gen; /* only valid if !never_written */ | |
162 | }; | |
163 | ||
164 | /* | |
165 | * Elements of this type are allocated dynamically and required because | |
166 | * each block object can refer to and can be ref from multiple blocks. | |
167 | * The key to lookup them in the hashtable is the dev_bytenr of | |
168 | * the block ref to plus the one from the block refered from. | |
169 | * The fact that they are searchable via a hashtable and that a | |
170 | * ref_cnt is maintained is not required for the btrfs integrity | |
171 | * check algorithm itself, it is only used to make the output more | |
172 | * beautiful in case that an error is detected (an error is defined | |
173 | * as a write operation to a block while that block is still referenced). | |
174 | */ | |
175 | struct btrfsic_block_link { | |
176 | u32 magic_num; /* only used for debug purposes */ | |
177 | u32 ref_cnt; | |
178 | struct list_head node_ref_to; /* list node */ | |
179 | struct list_head node_ref_from; /* list node */ | |
180 | struct list_head collision_resolving_node; /* list node */ | |
181 | struct btrfsic_block *block_ref_to; | |
182 | struct btrfsic_block *block_ref_from; | |
183 | u64 parent_generation; | |
184 | }; | |
185 | ||
186 | struct btrfsic_dev_state { | |
187 | u32 magic_num; /* only used for debug purposes */ | |
188 | struct block_device *bdev; | |
189 | struct btrfsic_state *state; | |
190 | struct list_head collision_resolving_node; /* list node */ | |
191 | struct btrfsic_block dummy_block_for_bio_bh_flush; | |
192 | u64 last_flush_gen; | |
193 | char name[BDEVNAME_SIZE]; | |
194 | }; | |
195 | ||
196 | struct btrfsic_block_hashtable { | |
197 | struct list_head table[BTRFSIC_BLOCK_HASHTABLE_SIZE]; | |
198 | }; | |
199 | ||
200 | struct btrfsic_block_link_hashtable { | |
201 | struct list_head table[BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE]; | |
202 | }; | |
203 | ||
204 | struct btrfsic_dev_state_hashtable { | |
205 | struct list_head table[BTRFSIC_DEV2STATE_HASHTABLE_SIZE]; | |
206 | }; | |
207 | ||
208 | struct btrfsic_block_data_ctx { | |
209 | u64 start; /* virtual bytenr */ | |
210 | u64 dev_bytenr; /* physical bytenr on device */ | |
211 | u32 len; | |
212 | struct btrfsic_dev_state *dev; | |
e06baab4 SB |
213 | char **datav; |
214 | struct page **pagev; | |
215 | void *mem_to_free; | |
5db02760 SB |
216 | }; |
217 | ||
218 | /* This structure is used to implement recursion without occupying | |
219 | * any stack space, refer to btrfsic_process_metablock() */ | |
220 | struct btrfsic_stack_frame { | |
221 | u32 magic; | |
222 | u32 nr; | |
223 | int error; | |
224 | int i; | |
225 | int limit_nesting; | |
226 | int num_copies; | |
227 | int mirror_num; | |
228 | struct btrfsic_block *block; | |
229 | struct btrfsic_block_data_ctx *block_ctx; | |
230 | struct btrfsic_block *next_block; | |
231 | struct btrfsic_block_data_ctx next_block_ctx; | |
232 | struct btrfs_header *hdr; | |
233 | struct btrfsic_stack_frame *prev; | |
234 | }; | |
235 | ||
236 | /* Some state per mounted filesystem */ | |
237 | struct btrfsic_state { | |
238 | u32 print_mask; | |
239 | int include_extent_data; | |
240 | int csum_size; | |
241 | struct list_head all_blocks_list; | |
242 | struct btrfsic_block_hashtable block_hashtable; | |
243 | struct btrfsic_block_link_hashtable block_link_hashtable; | |
244 | struct btrfs_root *root; | |
245 | u64 max_superblock_generation; | |
246 | struct btrfsic_block *latest_superblock; | |
e06baab4 SB |
247 | u32 metablock_size; |
248 | u32 datablock_size; | |
5db02760 SB |
249 | }; |
250 | ||
251 | static void btrfsic_block_init(struct btrfsic_block *b); | |
252 | static struct btrfsic_block *btrfsic_block_alloc(void); | |
253 | static void btrfsic_block_free(struct btrfsic_block *b); | |
254 | static void btrfsic_block_link_init(struct btrfsic_block_link *n); | |
255 | static struct btrfsic_block_link *btrfsic_block_link_alloc(void); | |
256 | static void btrfsic_block_link_free(struct btrfsic_block_link *n); | |
257 | static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds); | |
258 | static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void); | |
259 | static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds); | |
260 | static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h); | |
261 | static void btrfsic_block_hashtable_add(struct btrfsic_block *b, | |
262 | struct btrfsic_block_hashtable *h); | |
263 | static void btrfsic_block_hashtable_remove(struct btrfsic_block *b); | |
264 | static struct btrfsic_block *btrfsic_block_hashtable_lookup( | |
265 | struct block_device *bdev, | |
266 | u64 dev_bytenr, | |
267 | struct btrfsic_block_hashtable *h); | |
268 | static void btrfsic_block_link_hashtable_init( | |
269 | struct btrfsic_block_link_hashtable *h); | |
270 | static void btrfsic_block_link_hashtable_add( | |
271 | struct btrfsic_block_link *l, | |
272 | struct btrfsic_block_link_hashtable *h); | |
273 | static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l); | |
274 | static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup( | |
275 | struct block_device *bdev_ref_to, | |
276 | u64 dev_bytenr_ref_to, | |
277 | struct block_device *bdev_ref_from, | |
278 | u64 dev_bytenr_ref_from, | |
279 | struct btrfsic_block_link_hashtable *h); | |
280 | static void btrfsic_dev_state_hashtable_init( | |
281 | struct btrfsic_dev_state_hashtable *h); | |
282 | static void btrfsic_dev_state_hashtable_add( | |
283 | struct btrfsic_dev_state *ds, | |
284 | struct btrfsic_dev_state_hashtable *h); | |
285 | static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds); | |
286 | static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup( | |
287 | struct block_device *bdev, | |
288 | struct btrfsic_dev_state_hashtable *h); | |
289 | static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void); | |
290 | static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf); | |
291 | static int btrfsic_process_superblock(struct btrfsic_state *state, | |
292 | struct btrfs_fs_devices *fs_devices); | |
293 | static int btrfsic_process_metablock(struct btrfsic_state *state, | |
294 | struct btrfsic_block *block, | |
295 | struct btrfsic_block_data_ctx *block_ctx, | |
5db02760 | 296 | int limit_nesting, int force_iodone_flag); |
e06baab4 SB |
297 | static void btrfsic_read_from_block_data( |
298 | struct btrfsic_block_data_ctx *block_ctx, | |
299 | void *dst, u32 offset, size_t len); | |
5db02760 SB |
300 | static int btrfsic_create_link_to_next_block( |
301 | struct btrfsic_state *state, | |
302 | struct btrfsic_block *block, | |
303 | struct btrfsic_block_data_ctx | |
304 | *block_ctx, u64 next_bytenr, | |
305 | int limit_nesting, | |
306 | struct btrfsic_block_data_ctx *next_block_ctx, | |
307 | struct btrfsic_block **next_blockp, | |
308 | int force_iodone_flag, | |
309 | int *num_copiesp, int *mirror_nump, | |
310 | struct btrfs_disk_key *disk_key, | |
311 | u64 parent_generation); | |
312 | static int btrfsic_handle_extent_data(struct btrfsic_state *state, | |
313 | struct btrfsic_block *block, | |
314 | struct btrfsic_block_data_ctx *block_ctx, | |
315 | u32 item_offset, int force_iodone_flag); | |
316 | static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len, | |
317 | struct btrfsic_block_data_ctx *block_ctx_out, | |
318 | int mirror_num); | |
319 | static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr, | |
320 | u32 len, struct block_device *bdev, | |
321 | struct btrfsic_block_data_ctx *block_ctx_out); | |
322 | static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx); | |
323 | static int btrfsic_read_block(struct btrfsic_state *state, | |
324 | struct btrfsic_block_data_ctx *block_ctx); | |
325 | static void btrfsic_dump_database(struct btrfsic_state *state); | |
e06baab4 | 326 | static void btrfsic_complete_bio_end_io(struct bio *bio, int err); |
5db02760 | 327 | static int btrfsic_test_for_metadata(struct btrfsic_state *state, |
e06baab4 | 328 | char **datav, unsigned int num_pages); |
5db02760 | 329 | static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state, |
e06baab4 SB |
330 | u64 dev_bytenr, char **mapped_datav, |
331 | unsigned int num_pages, | |
332 | struct bio *bio, int *bio_is_patched, | |
5db02760 SB |
333 | struct buffer_head *bh, |
334 | int submit_bio_bh_rw); | |
335 | static int btrfsic_process_written_superblock( | |
336 | struct btrfsic_state *state, | |
337 | struct btrfsic_block *const block, | |
338 | struct btrfs_super_block *const super_hdr); | |
339 | static void btrfsic_bio_end_io(struct bio *bp, int bio_error_status); | |
340 | static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate); | |
341 | static int btrfsic_is_block_ref_by_superblock(const struct btrfsic_state *state, | |
342 | const struct btrfsic_block *block, | |
343 | int recursion_level); | |
344 | static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state, | |
345 | struct btrfsic_block *const block, | |
346 | int recursion_level); | |
347 | static void btrfsic_print_add_link(const struct btrfsic_state *state, | |
348 | const struct btrfsic_block_link *l); | |
349 | static void btrfsic_print_rem_link(const struct btrfsic_state *state, | |
350 | const struct btrfsic_block_link *l); | |
351 | static char btrfsic_get_block_type(const struct btrfsic_state *state, | |
352 | const struct btrfsic_block *block); | |
353 | static void btrfsic_dump_tree(const struct btrfsic_state *state); | |
354 | static void btrfsic_dump_tree_sub(const struct btrfsic_state *state, | |
355 | const struct btrfsic_block *block, | |
356 | int indent_level); | |
357 | static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add( | |
358 | struct btrfsic_state *state, | |
359 | struct btrfsic_block_data_ctx *next_block_ctx, | |
360 | struct btrfsic_block *next_block, | |
361 | struct btrfsic_block *from_block, | |
362 | u64 parent_generation); | |
363 | static struct btrfsic_block *btrfsic_block_lookup_or_add( | |
364 | struct btrfsic_state *state, | |
365 | struct btrfsic_block_data_ctx *block_ctx, | |
366 | const char *additional_string, | |
367 | int is_metadata, | |
368 | int is_iodone, | |
369 | int never_written, | |
370 | int mirror_num, | |
371 | int *was_created); | |
372 | static int btrfsic_process_superblock_dev_mirror( | |
373 | struct btrfsic_state *state, | |
374 | struct btrfsic_dev_state *dev_state, | |
375 | struct btrfs_device *device, | |
376 | int superblock_mirror_num, | |
377 | struct btrfsic_dev_state **selected_dev_state, | |
378 | struct btrfs_super_block *selected_super); | |
379 | static struct btrfsic_dev_state *btrfsic_dev_state_lookup( | |
380 | struct block_device *bdev); | |
381 | static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state, | |
382 | u64 bytenr, | |
383 | struct btrfsic_dev_state *dev_state, | |
e06baab4 | 384 | u64 dev_bytenr); |
5db02760 SB |
385 | |
386 | static struct mutex btrfsic_mutex; | |
387 | static int btrfsic_is_initialized; | |
388 | static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable; | |
389 | ||
390 | ||
391 | static void btrfsic_block_init(struct btrfsic_block *b) | |
392 | { | |
393 | b->magic_num = BTRFSIC_BLOCK_MAGIC_NUMBER; | |
394 | b->dev_state = NULL; | |
395 | b->dev_bytenr = 0; | |
396 | b->logical_bytenr = 0; | |
397 | b->generation = BTRFSIC_GENERATION_UNKNOWN; | |
398 | b->disk_key.objectid = 0; | |
399 | b->disk_key.type = 0; | |
400 | b->disk_key.offset = 0; | |
401 | b->is_metadata = 0; | |
402 | b->is_superblock = 0; | |
403 | b->is_iodone = 0; | |
404 | b->iodone_w_error = 0; | |
405 | b->never_written = 0; | |
406 | b->mirror_num = 0; | |
407 | b->next_in_same_bio = NULL; | |
408 | b->orig_bio_bh_private = NULL; | |
409 | b->orig_bio_bh_end_io.bio = NULL; | |
410 | INIT_LIST_HEAD(&b->collision_resolving_node); | |
411 | INIT_LIST_HEAD(&b->all_blocks_node); | |
412 | INIT_LIST_HEAD(&b->ref_to_list); | |
413 | INIT_LIST_HEAD(&b->ref_from_list); | |
414 | b->submit_bio_bh_rw = 0; | |
415 | b->flush_gen = 0; | |
416 | } | |
417 | ||
418 | static struct btrfsic_block *btrfsic_block_alloc(void) | |
419 | { | |
420 | struct btrfsic_block *b; | |
421 | ||
422 | b = kzalloc(sizeof(*b), GFP_NOFS); | |
423 | if (NULL != b) | |
424 | btrfsic_block_init(b); | |
425 | ||
426 | return b; | |
427 | } | |
428 | ||
429 | static void btrfsic_block_free(struct btrfsic_block *b) | |
430 | { | |
431 | BUG_ON(!(NULL == b || BTRFSIC_BLOCK_MAGIC_NUMBER == b->magic_num)); | |
432 | kfree(b); | |
433 | } | |
434 | ||
435 | static void btrfsic_block_link_init(struct btrfsic_block_link *l) | |
436 | { | |
437 | l->magic_num = BTRFSIC_BLOCK_LINK_MAGIC_NUMBER; | |
438 | l->ref_cnt = 1; | |
439 | INIT_LIST_HEAD(&l->node_ref_to); | |
440 | INIT_LIST_HEAD(&l->node_ref_from); | |
441 | INIT_LIST_HEAD(&l->collision_resolving_node); | |
442 | l->block_ref_to = NULL; | |
443 | l->block_ref_from = NULL; | |
444 | } | |
445 | ||
446 | static struct btrfsic_block_link *btrfsic_block_link_alloc(void) | |
447 | { | |
448 | struct btrfsic_block_link *l; | |
449 | ||
450 | l = kzalloc(sizeof(*l), GFP_NOFS); | |
451 | if (NULL != l) | |
452 | btrfsic_block_link_init(l); | |
453 | ||
454 | return l; | |
455 | } | |
456 | ||
457 | static void btrfsic_block_link_free(struct btrfsic_block_link *l) | |
458 | { | |
459 | BUG_ON(!(NULL == l || BTRFSIC_BLOCK_LINK_MAGIC_NUMBER == l->magic_num)); | |
460 | kfree(l); | |
461 | } | |
462 | ||
463 | static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds) | |
464 | { | |
465 | ds->magic_num = BTRFSIC_DEV2STATE_MAGIC_NUMBER; | |
466 | ds->bdev = NULL; | |
467 | ds->state = NULL; | |
468 | ds->name[0] = '\0'; | |
469 | INIT_LIST_HEAD(&ds->collision_resolving_node); | |
470 | ds->last_flush_gen = 0; | |
471 | btrfsic_block_init(&ds->dummy_block_for_bio_bh_flush); | |
472 | ds->dummy_block_for_bio_bh_flush.is_iodone = 1; | |
473 | ds->dummy_block_for_bio_bh_flush.dev_state = ds; | |
474 | } | |
475 | ||
476 | static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void) | |
477 | { | |
478 | struct btrfsic_dev_state *ds; | |
479 | ||
480 | ds = kzalloc(sizeof(*ds), GFP_NOFS); | |
481 | if (NULL != ds) | |
482 | btrfsic_dev_state_init(ds); | |
483 | ||
484 | return ds; | |
485 | } | |
486 | ||
487 | static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds) | |
488 | { | |
489 | BUG_ON(!(NULL == ds || | |
490 | BTRFSIC_DEV2STATE_MAGIC_NUMBER == ds->magic_num)); | |
491 | kfree(ds); | |
492 | } | |
493 | ||
494 | static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h) | |
495 | { | |
496 | int i; | |
497 | ||
498 | for (i = 0; i < BTRFSIC_BLOCK_HASHTABLE_SIZE; i++) | |
499 | INIT_LIST_HEAD(h->table + i); | |
500 | } | |
501 | ||
502 | static void btrfsic_block_hashtable_add(struct btrfsic_block *b, | |
503 | struct btrfsic_block_hashtable *h) | |
504 | { | |
505 | const unsigned int hashval = | |
506 | (((unsigned int)(b->dev_bytenr >> 16)) ^ | |
507 | ((unsigned int)((uintptr_t)b->dev_state->bdev))) & | |
508 | (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1); | |
509 | ||
510 | list_add(&b->collision_resolving_node, h->table + hashval); | |
511 | } | |
512 | ||
513 | static void btrfsic_block_hashtable_remove(struct btrfsic_block *b) | |
514 | { | |
515 | list_del(&b->collision_resolving_node); | |
516 | } | |
517 | ||
518 | static struct btrfsic_block *btrfsic_block_hashtable_lookup( | |
519 | struct block_device *bdev, | |
520 | u64 dev_bytenr, | |
521 | struct btrfsic_block_hashtable *h) | |
522 | { | |
523 | const unsigned int hashval = | |
524 | (((unsigned int)(dev_bytenr >> 16)) ^ | |
525 | ((unsigned int)((uintptr_t)bdev))) & | |
526 | (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1); | |
527 | struct list_head *elem; | |
528 | ||
529 | list_for_each(elem, h->table + hashval) { | |
530 | struct btrfsic_block *const b = | |
531 | list_entry(elem, struct btrfsic_block, | |
532 | collision_resolving_node); | |
533 | ||
534 | if (b->dev_state->bdev == bdev && b->dev_bytenr == dev_bytenr) | |
535 | return b; | |
536 | } | |
537 | ||
538 | return NULL; | |
539 | } | |
540 | ||
541 | static void btrfsic_block_link_hashtable_init( | |
542 | struct btrfsic_block_link_hashtable *h) | |
543 | { | |
544 | int i; | |
545 | ||
546 | for (i = 0; i < BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE; i++) | |
547 | INIT_LIST_HEAD(h->table + i); | |
548 | } | |
549 | ||
550 | static void btrfsic_block_link_hashtable_add( | |
551 | struct btrfsic_block_link *l, | |
552 | struct btrfsic_block_link_hashtable *h) | |
553 | { | |
554 | const unsigned int hashval = | |
555 | (((unsigned int)(l->block_ref_to->dev_bytenr >> 16)) ^ | |
556 | ((unsigned int)(l->block_ref_from->dev_bytenr >> 16)) ^ | |
557 | ((unsigned int)((uintptr_t)l->block_ref_to->dev_state->bdev)) ^ | |
558 | ((unsigned int)((uintptr_t)l->block_ref_from->dev_state->bdev))) | |
559 | & (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1); | |
560 | ||
561 | BUG_ON(NULL == l->block_ref_to); | |
562 | BUG_ON(NULL == l->block_ref_from); | |
563 | list_add(&l->collision_resolving_node, h->table + hashval); | |
564 | } | |
565 | ||
566 | static void btrfsic_block_link_hashtable_remove(struct btrfsic_block_link *l) | |
567 | { | |
568 | list_del(&l->collision_resolving_node); | |
569 | } | |
570 | ||
571 | static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup( | |
572 | struct block_device *bdev_ref_to, | |
573 | u64 dev_bytenr_ref_to, | |
574 | struct block_device *bdev_ref_from, | |
575 | u64 dev_bytenr_ref_from, | |
576 | struct btrfsic_block_link_hashtable *h) | |
577 | { | |
578 | const unsigned int hashval = | |
579 | (((unsigned int)(dev_bytenr_ref_to >> 16)) ^ | |
580 | ((unsigned int)(dev_bytenr_ref_from >> 16)) ^ | |
581 | ((unsigned int)((uintptr_t)bdev_ref_to)) ^ | |
582 | ((unsigned int)((uintptr_t)bdev_ref_from))) & | |
583 | (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1); | |
584 | struct list_head *elem; | |
585 | ||
586 | list_for_each(elem, h->table + hashval) { | |
587 | struct btrfsic_block_link *const l = | |
588 | list_entry(elem, struct btrfsic_block_link, | |
589 | collision_resolving_node); | |
590 | ||
591 | BUG_ON(NULL == l->block_ref_to); | |
592 | BUG_ON(NULL == l->block_ref_from); | |
593 | if (l->block_ref_to->dev_state->bdev == bdev_ref_to && | |
594 | l->block_ref_to->dev_bytenr == dev_bytenr_ref_to && | |
595 | l->block_ref_from->dev_state->bdev == bdev_ref_from && | |
596 | l->block_ref_from->dev_bytenr == dev_bytenr_ref_from) | |
597 | return l; | |
598 | } | |
599 | ||
600 | return NULL; | |
601 | } | |
602 | ||
603 | static void btrfsic_dev_state_hashtable_init( | |
604 | struct btrfsic_dev_state_hashtable *h) | |
605 | { | |
606 | int i; | |
607 | ||
608 | for (i = 0; i < BTRFSIC_DEV2STATE_HASHTABLE_SIZE; i++) | |
609 | INIT_LIST_HEAD(h->table + i); | |
610 | } | |
611 | ||
612 | static void btrfsic_dev_state_hashtable_add( | |
613 | struct btrfsic_dev_state *ds, | |
614 | struct btrfsic_dev_state_hashtable *h) | |
615 | { | |
616 | const unsigned int hashval = | |
617 | (((unsigned int)((uintptr_t)ds->bdev)) & | |
618 | (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1)); | |
619 | ||
620 | list_add(&ds->collision_resolving_node, h->table + hashval); | |
621 | } | |
622 | ||
623 | static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds) | |
624 | { | |
625 | list_del(&ds->collision_resolving_node); | |
626 | } | |
627 | ||
628 | static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup( | |
629 | struct block_device *bdev, | |
630 | struct btrfsic_dev_state_hashtable *h) | |
631 | { | |
632 | const unsigned int hashval = | |
633 | (((unsigned int)((uintptr_t)bdev)) & | |
634 | (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1)); | |
635 | struct list_head *elem; | |
636 | ||
637 | list_for_each(elem, h->table + hashval) { | |
638 | struct btrfsic_dev_state *const ds = | |
639 | list_entry(elem, struct btrfsic_dev_state, | |
640 | collision_resolving_node); | |
641 | ||
642 | if (ds->bdev == bdev) | |
643 | return ds; | |
644 | } | |
645 | ||
646 | return NULL; | |
647 | } | |
648 | ||
649 | static int btrfsic_process_superblock(struct btrfsic_state *state, | |
650 | struct btrfs_fs_devices *fs_devices) | |
651 | { | |
e77266e4 | 652 | int ret = 0; |
5db02760 SB |
653 | struct btrfs_super_block *selected_super; |
654 | struct list_head *dev_head = &fs_devices->devices; | |
655 | struct btrfs_device *device; | |
656 | struct btrfsic_dev_state *selected_dev_state = NULL; | |
657 | int pass; | |
658 | ||
659 | BUG_ON(NULL == state); | |
e06baab4 | 660 | selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS); |
5db02760 SB |
661 | if (NULL == selected_super) { |
662 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
663 | return -1; | |
664 | } | |
665 | ||
666 | list_for_each_entry(device, dev_head, dev_list) { | |
667 | int i; | |
668 | struct btrfsic_dev_state *dev_state; | |
669 | ||
670 | if (!device->bdev || !device->name) | |
671 | continue; | |
672 | ||
673 | dev_state = btrfsic_dev_state_lookup(device->bdev); | |
674 | BUG_ON(NULL == dev_state); | |
675 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
676 | ret = btrfsic_process_superblock_dev_mirror( | |
677 | state, dev_state, device, i, | |
678 | &selected_dev_state, selected_super); | |
679 | if (0 != ret && 0 == i) { | |
680 | kfree(selected_super); | |
681 | return ret; | |
682 | } | |
683 | } | |
684 | } | |
685 | ||
686 | if (NULL == state->latest_superblock) { | |
687 | printk(KERN_INFO "btrfsic: no superblock found!\n"); | |
688 | kfree(selected_super); | |
689 | return -1; | |
690 | } | |
691 | ||
692 | state->csum_size = btrfs_super_csum_size(selected_super); | |
693 | ||
694 | for (pass = 0; pass < 3; pass++) { | |
695 | int num_copies; | |
696 | int mirror_num; | |
697 | u64 next_bytenr; | |
698 | ||
699 | switch (pass) { | |
700 | case 0: | |
701 | next_bytenr = btrfs_super_root(selected_super); | |
702 | if (state->print_mask & | |
703 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 704 | printk(KERN_INFO "root@%llu\n", next_bytenr); |
5db02760 SB |
705 | break; |
706 | case 1: | |
707 | next_bytenr = btrfs_super_chunk_root(selected_super); | |
708 | if (state->print_mask & | |
709 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 710 | printk(KERN_INFO "chunk@%llu\n", next_bytenr); |
5db02760 SB |
711 | break; |
712 | case 2: | |
713 | next_bytenr = btrfs_super_log_root(selected_super); | |
714 | if (0 == next_bytenr) | |
715 | continue; | |
716 | if (state->print_mask & | |
717 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 718 | printk(KERN_INFO "log@%llu\n", next_bytenr); |
5db02760 SB |
719 | break; |
720 | } | |
721 | ||
722 | num_copies = | |
5d964051 | 723 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 724 | next_bytenr, state->metablock_size); |
5db02760 SB |
725 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
726 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 727 | next_bytenr, num_copies); |
5db02760 SB |
728 | |
729 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { | |
730 | struct btrfsic_block *next_block; | |
731 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
732 | struct btrfsic_block_link *l; | |
5db02760 | 733 | |
e06baab4 SB |
734 | ret = btrfsic_map_block(state, next_bytenr, |
735 | state->metablock_size, | |
5db02760 SB |
736 | &tmp_next_block_ctx, |
737 | mirror_num); | |
738 | if (ret) { | |
739 | printk(KERN_INFO "btrfsic:" | |
740 | " btrfsic_map_block(root @%llu," | |
741 | " mirror %d) failed!\n", | |
c1c9ff7c | 742 | next_bytenr, mirror_num); |
5db02760 SB |
743 | kfree(selected_super); |
744 | return -1; | |
745 | } | |
746 | ||
747 | next_block = btrfsic_block_hashtable_lookup( | |
748 | tmp_next_block_ctx.dev->bdev, | |
749 | tmp_next_block_ctx.dev_bytenr, | |
750 | &state->block_hashtable); | |
751 | BUG_ON(NULL == next_block); | |
752 | ||
753 | l = btrfsic_block_link_hashtable_lookup( | |
754 | tmp_next_block_ctx.dev->bdev, | |
755 | tmp_next_block_ctx.dev_bytenr, | |
756 | state->latest_superblock->dev_state-> | |
757 | bdev, | |
758 | state->latest_superblock->dev_bytenr, | |
759 | &state->block_link_hashtable); | |
760 | BUG_ON(NULL == l); | |
761 | ||
762 | ret = btrfsic_read_block(state, &tmp_next_block_ctx); | |
e06baab4 | 763 | if (ret < (int)PAGE_CACHE_SIZE) { |
5db02760 SB |
764 | printk(KERN_INFO |
765 | "btrfsic: read @logical %llu failed!\n", | |
5db02760 SB |
766 | tmp_next_block_ctx.start); |
767 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
768 | kfree(selected_super); | |
769 | return -1; | |
770 | } | |
771 | ||
5db02760 SB |
772 | ret = btrfsic_process_metablock(state, |
773 | next_block, | |
774 | &tmp_next_block_ctx, | |
5db02760 SB |
775 | BTRFS_MAX_LEVEL + 3, 1); |
776 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
777 | } | |
778 | } | |
779 | ||
780 | kfree(selected_super); | |
781 | return ret; | |
782 | } | |
783 | ||
784 | static int btrfsic_process_superblock_dev_mirror( | |
785 | struct btrfsic_state *state, | |
786 | struct btrfsic_dev_state *dev_state, | |
787 | struct btrfs_device *device, | |
788 | int superblock_mirror_num, | |
789 | struct btrfsic_dev_state **selected_dev_state, | |
790 | struct btrfs_super_block *selected_super) | |
791 | { | |
792 | struct btrfs_super_block *super_tmp; | |
793 | u64 dev_bytenr; | |
794 | struct buffer_head *bh; | |
795 | struct btrfsic_block *superblock_tmp; | |
796 | int pass; | |
797 | struct block_device *const superblock_bdev = device->bdev; | |
798 | ||
799 | /* super block bytenr is always the unmapped device bytenr */ | |
800 | dev_bytenr = btrfs_sb_offset(superblock_mirror_num); | |
e06baab4 SB |
801 | if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes) |
802 | return -1; | |
803 | bh = __bread(superblock_bdev, dev_bytenr / 4096, | |
804 | BTRFS_SUPER_INFO_SIZE); | |
5db02760 SB |
805 | if (NULL == bh) |
806 | return -1; | |
807 | super_tmp = (struct btrfs_super_block *) | |
808 | (bh->b_data + (dev_bytenr & 4095)); | |
809 | ||
810 | if (btrfs_super_bytenr(super_tmp) != dev_bytenr || | |
3cae210f | 811 | btrfs_super_magic(super_tmp) != BTRFS_MAGIC || |
e06baab4 SB |
812 | memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) || |
813 | btrfs_super_nodesize(super_tmp) != state->metablock_size || | |
814 | btrfs_super_leafsize(super_tmp) != state->metablock_size || | |
815 | btrfs_super_sectorsize(super_tmp) != state->datablock_size) { | |
5db02760 SB |
816 | brelse(bh); |
817 | return 0; | |
818 | } | |
819 | ||
820 | superblock_tmp = | |
821 | btrfsic_block_hashtable_lookup(superblock_bdev, | |
822 | dev_bytenr, | |
823 | &state->block_hashtable); | |
824 | if (NULL == superblock_tmp) { | |
825 | superblock_tmp = btrfsic_block_alloc(); | |
826 | if (NULL == superblock_tmp) { | |
827 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
828 | brelse(bh); | |
829 | return -1; | |
830 | } | |
831 | /* for superblock, only the dev_bytenr makes sense */ | |
832 | superblock_tmp->dev_bytenr = dev_bytenr; | |
833 | superblock_tmp->dev_state = dev_state; | |
834 | superblock_tmp->logical_bytenr = dev_bytenr; | |
835 | superblock_tmp->generation = btrfs_super_generation(super_tmp); | |
836 | superblock_tmp->is_metadata = 1; | |
837 | superblock_tmp->is_superblock = 1; | |
838 | superblock_tmp->is_iodone = 1; | |
839 | superblock_tmp->never_written = 0; | |
840 | superblock_tmp->mirror_num = 1 + superblock_mirror_num; | |
841 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
606686ee JB |
842 | printk_in_rcu(KERN_INFO "New initial S-block (bdev %p, %s)" |
843 | " @%llu (%s/%llu/%d)\n", | |
844 | superblock_bdev, | |
c1c9ff7c GU |
845 | rcu_str_deref(device->name), dev_bytenr, |
846 | dev_state->name, dev_bytenr, | |
606686ee | 847 | superblock_mirror_num); |
5db02760 SB |
848 | list_add(&superblock_tmp->all_blocks_node, |
849 | &state->all_blocks_list); | |
850 | btrfsic_block_hashtable_add(superblock_tmp, | |
851 | &state->block_hashtable); | |
852 | } | |
853 | ||
854 | /* select the one with the highest generation field */ | |
855 | if (btrfs_super_generation(super_tmp) > | |
856 | state->max_superblock_generation || | |
857 | 0 == state->max_superblock_generation) { | |
858 | memcpy(selected_super, super_tmp, sizeof(*selected_super)); | |
859 | *selected_dev_state = dev_state; | |
860 | state->max_superblock_generation = | |
861 | btrfs_super_generation(super_tmp); | |
862 | state->latest_superblock = superblock_tmp; | |
863 | } | |
864 | ||
865 | for (pass = 0; pass < 3; pass++) { | |
866 | u64 next_bytenr; | |
867 | int num_copies; | |
868 | int mirror_num; | |
869 | const char *additional_string = NULL; | |
870 | struct btrfs_disk_key tmp_disk_key; | |
871 | ||
872 | tmp_disk_key.type = BTRFS_ROOT_ITEM_KEY; | |
873 | tmp_disk_key.offset = 0; | |
874 | switch (pass) { | |
875 | case 0: | |
3cae210f QW |
876 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
877 | BTRFS_ROOT_TREE_OBJECTID); | |
5db02760 SB |
878 | additional_string = "initial root "; |
879 | next_bytenr = btrfs_super_root(super_tmp); | |
880 | break; | |
881 | case 1: | |
3cae210f QW |
882 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
883 | BTRFS_CHUNK_TREE_OBJECTID); | |
5db02760 SB |
884 | additional_string = "initial chunk "; |
885 | next_bytenr = btrfs_super_chunk_root(super_tmp); | |
886 | break; | |
887 | case 2: | |
3cae210f QW |
888 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
889 | BTRFS_TREE_LOG_OBJECTID); | |
5db02760 SB |
890 | additional_string = "initial log "; |
891 | next_bytenr = btrfs_super_log_root(super_tmp); | |
892 | if (0 == next_bytenr) | |
893 | continue; | |
894 | break; | |
895 | } | |
896 | ||
897 | num_copies = | |
5d964051 | 898 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 899 | next_bytenr, state->metablock_size); |
5db02760 SB |
900 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
901 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 902 | next_bytenr, num_copies); |
5db02760 SB |
903 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
904 | struct btrfsic_block *next_block; | |
905 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
906 | struct btrfsic_block_link *l; | |
907 | ||
e06baab4 SB |
908 | if (btrfsic_map_block(state, next_bytenr, |
909 | state->metablock_size, | |
5db02760 SB |
910 | &tmp_next_block_ctx, |
911 | mirror_num)) { | |
912 | printk(KERN_INFO "btrfsic: btrfsic_map_block(" | |
913 | "bytenr @%llu, mirror %d) failed!\n", | |
c1c9ff7c | 914 | next_bytenr, mirror_num); |
5db02760 SB |
915 | brelse(bh); |
916 | return -1; | |
917 | } | |
918 | ||
919 | next_block = btrfsic_block_lookup_or_add( | |
920 | state, &tmp_next_block_ctx, | |
921 | additional_string, 1, 1, 0, | |
922 | mirror_num, NULL); | |
923 | if (NULL == next_block) { | |
924 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
925 | brelse(bh); | |
926 | return -1; | |
927 | } | |
928 | ||
929 | next_block->disk_key = tmp_disk_key; | |
930 | next_block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
931 | l = btrfsic_block_link_lookup_or_add( | |
932 | state, &tmp_next_block_ctx, | |
933 | next_block, superblock_tmp, | |
934 | BTRFSIC_GENERATION_UNKNOWN); | |
935 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
936 | if (NULL == l) { | |
937 | brelse(bh); | |
938 | return -1; | |
939 | } | |
940 | } | |
941 | } | |
942 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES) | |
943 | btrfsic_dump_tree_sub(state, superblock_tmp, 0); | |
944 | ||
945 | brelse(bh); | |
946 | return 0; | |
947 | } | |
948 | ||
949 | static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void) | |
950 | { | |
951 | struct btrfsic_stack_frame *sf; | |
952 | ||
953 | sf = kzalloc(sizeof(*sf), GFP_NOFS); | |
954 | if (NULL == sf) | |
955 | printk(KERN_INFO "btrfsic: alloc memory failed!\n"); | |
956 | else | |
957 | sf->magic = BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER; | |
958 | return sf; | |
959 | } | |
960 | ||
961 | static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf) | |
962 | { | |
963 | BUG_ON(!(NULL == sf || | |
964 | BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER == sf->magic)); | |
965 | kfree(sf); | |
966 | } | |
967 | ||
968 | static int btrfsic_process_metablock( | |
969 | struct btrfsic_state *state, | |
970 | struct btrfsic_block *const first_block, | |
971 | struct btrfsic_block_data_ctx *const first_block_ctx, | |
5db02760 SB |
972 | int first_limit_nesting, int force_iodone_flag) |
973 | { | |
974 | struct btrfsic_stack_frame initial_stack_frame = { 0 }; | |
975 | struct btrfsic_stack_frame *sf; | |
976 | struct btrfsic_stack_frame *next_stack; | |
e06baab4 SB |
977 | struct btrfs_header *const first_hdr = |
978 | (struct btrfs_header *)first_block_ctx->datav[0]; | |
5db02760 | 979 | |
e06baab4 | 980 | BUG_ON(!first_hdr); |
5db02760 SB |
981 | sf = &initial_stack_frame; |
982 | sf->error = 0; | |
983 | sf->i = -1; | |
984 | sf->limit_nesting = first_limit_nesting; | |
985 | sf->block = first_block; | |
986 | sf->block_ctx = first_block_ctx; | |
987 | sf->next_block = NULL; | |
988 | sf->hdr = first_hdr; | |
989 | sf->prev = NULL; | |
990 | ||
991 | continue_with_new_stack_frame: | |
992 | sf->block->generation = le64_to_cpu(sf->hdr->generation); | |
993 | if (0 == sf->hdr->level) { | |
994 | struct btrfs_leaf *const leafhdr = | |
995 | (struct btrfs_leaf *)sf->hdr; | |
996 | ||
997 | if (-1 == sf->i) { | |
3cae210f | 998 | sf->nr = btrfs_stack_header_nritems(&leafhdr->header); |
5db02760 SB |
999 | |
1000 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1001 | printk(KERN_INFO | |
1002 | "leaf %llu items %d generation %llu" | |
1003 | " owner %llu\n", | |
c1c9ff7c | 1004 | sf->block_ctx->start, sf->nr, |
3cae210f QW |
1005 | btrfs_stack_header_generation( |
1006 | &leafhdr->header), | |
3cae210f QW |
1007 | btrfs_stack_header_owner( |
1008 | &leafhdr->header)); | |
5db02760 SB |
1009 | } |
1010 | ||
1011 | continue_with_current_leaf_stack_frame: | |
1012 | if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) { | |
1013 | sf->i++; | |
1014 | sf->num_copies = 0; | |
1015 | } | |
1016 | ||
1017 | if (sf->i < sf->nr) { | |
e06baab4 SB |
1018 | struct btrfs_item disk_item; |
1019 | u32 disk_item_offset = | |
1020 | (uintptr_t)(leafhdr->items + sf->i) - | |
1021 | (uintptr_t)leafhdr; | |
1022 | struct btrfs_disk_key *disk_key; | |
5db02760 | 1023 | u8 type; |
e06baab4 | 1024 | u32 item_offset; |
8ea05e3a | 1025 | u32 item_size; |
5db02760 | 1026 | |
e06baab4 SB |
1027 | if (disk_item_offset + sizeof(struct btrfs_item) > |
1028 | sf->block_ctx->len) { | |
1029 | leaf_item_out_of_bounce_error: | |
1030 | printk(KERN_INFO | |
1031 | "btrfsic: leaf item out of bounce at logical %llu, dev %s\n", | |
1032 | sf->block_ctx->start, | |
1033 | sf->block_ctx->dev->name); | |
1034 | goto one_stack_frame_backwards; | |
1035 | } | |
1036 | btrfsic_read_from_block_data(sf->block_ctx, | |
1037 | &disk_item, | |
1038 | disk_item_offset, | |
1039 | sizeof(struct btrfs_item)); | |
3cae210f | 1040 | item_offset = btrfs_stack_item_offset(&disk_item); |
a5f519c9 | 1041 | item_size = btrfs_stack_item_size(&disk_item); |
e06baab4 | 1042 | disk_key = &disk_item.key; |
3cae210f | 1043 | type = btrfs_disk_key_type(disk_key); |
5db02760 SB |
1044 | |
1045 | if (BTRFS_ROOT_ITEM_KEY == type) { | |
e06baab4 SB |
1046 | struct btrfs_root_item root_item; |
1047 | u32 root_item_offset; | |
1048 | u64 next_bytenr; | |
1049 | ||
1050 | root_item_offset = item_offset + | |
1051 | offsetof(struct btrfs_leaf, items); | |
8ea05e3a | 1052 | if (root_item_offset + item_size > |
e06baab4 SB |
1053 | sf->block_ctx->len) |
1054 | goto leaf_item_out_of_bounce_error; | |
1055 | btrfsic_read_from_block_data( | |
1056 | sf->block_ctx, &root_item, | |
1057 | root_item_offset, | |
8ea05e3a | 1058 | item_size); |
3cae210f | 1059 | next_bytenr = btrfs_root_bytenr(&root_item); |
5db02760 SB |
1060 | |
1061 | sf->error = | |
1062 | btrfsic_create_link_to_next_block( | |
1063 | state, | |
1064 | sf->block, | |
1065 | sf->block_ctx, | |
1066 | next_bytenr, | |
1067 | sf->limit_nesting, | |
1068 | &sf->next_block_ctx, | |
1069 | &sf->next_block, | |
1070 | force_iodone_flag, | |
1071 | &sf->num_copies, | |
1072 | &sf->mirror_num, | |
1073 | disk_key, | |
3cae210f QW |
1074 | btrfs_root_generation( |
1075 | &root_item)); | |
5db02760 SB |
1076 | if (sf->error) |
1077 | goto one_stack_frame_backwards; | |
1078 | ||
1079 | if (NULL != sf->next_block) { | |
1080 | struct btrfs_header *const next_hdr = | |
1081 | (struct btrfs_header *) | |
e06baab4 | 1082 | sf->next_block_ctx.datav[0]; |
5db02760 SB |
1083 | |
1084 | next_stack = | |
1085 | btrfsic_stack_frame_alloc(); | |
1086 | if (NULL == next_stack) { | |
1087 | btrfsic_release_block_ctx( | |
1088 | &sf-> | |
1089 | next_block_ctx); | |
1090 | goto one_stack_frame_backwards; | |
1091 | } | |
1092 | ||
1093 | next_stack->i = -1; | |
1094 | next_stack->block = sf->next_block; | |
1095 | next_stack->block_ctx = | |
1096 | &sf->next_block_ctx; | |
1097 | next_stack->next_block = NULL; | |
1098 | next_stack->hdr = next_hdr; | |
1099 | next_stack->limit_nesting = | |
1100 | sf->limit_nesting - 1; | |
1101 | next_stack->prev = sf; | |
1102 | sf = next_stack; | |
1103 | goto continue_with_new_stack_frame; | |
1104 | } | |
1105 | } else if (BTRFS_EXTENT_DATA_KEY == type && | |
1106 | state->include_extent_data) { | |
1107 | sf->error = btrfsic_handle_extent_data( | |
1108 | state, | |
1109 | sf->block, | |
1110 | sf->block_ctx, | |
1111 | item_offset, | |
1112 | force_iodone_flag); | |
1113 | if (sf->error) | |
1114 | goto one_stack_frame_backwards; | |
1115 | } | |
1116 | ||
1117 | goto continue_with_current_leaf_stack_frame; | |
1118 | } | |
1119 | } else { | |
1120 | struct btrfs_node *const nodehdr = (struct btrfs_node *)sf->hdr; | |
1121 | ||
1122 | if (-1 == sf->i) { | |
3cae210f | 1123 | sf->nr = btrfs_stack_header_nritems(&nodehdr->header); |
5db02760 SB |
1124 | |
1125 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1126 | printk(KERN_INFO "node %llu level %d items %d" | |
1127 | " generation %llu owner %llu\n", | |
5db02760 SB |
1128 | sf->block_ctx->start, |
1129 | nodehdr->header.level, sf->nr, | |
3cae210f QW |
1130 | btrfs_stack_header_generation( |
1131 | &nodehdr->header), | |
3cae210f QW |
1132 | btrfs_stack_header_owner( |
1133 | &nodehdr->header)); | |
5db02760 SB |
1134 | } |
1135 | ||
1136 | continue_with_current_node_stack_frame: | |
1137 | if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) { | |
1138 | sf->i++; | |
1139 | sf->num_copies = 0; | |
1140 | } | |
1141 | ||
1142 | if (sf->i < sf->nr) { | |
e06baab4 SB |
1143 | struct btrfs_key_ptr key_ptr; |
1144 | u32 key_ptr_offset; | |
1145 | u64 next_bytenr; | |
1146 | ||
1147 | key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) - | |
1148 | (uintptr_t)nodehdr; | |
1149 | if (key_ptr_offset + sizeof(struct btrfs_key_ptr) > | |
1150 | sf->block_ctx->len) { | |
1151 | printk(KERN_INFO | |
1152 | "btrfsic: node item out of bounce at logical %llu, dev %s\n", | |
1153 | sf->block_ctx->start, | |
1154 | sf->block_ctx->dev->name); | |
1155 | goto one_stack_frame_backwards; | |
1156 | } | |
1157 | btrfsic_read_from_block_data( | |
1158 | sf->block_ctx, &key_ptr, key_ptr_offset, | |
1159 | sizeof(struct btrfs_key_ptr)); | |
3cae210f | 1160 | next_bytenr = btrfs_stack_key_blockptr(&key_ptr); |
5db02760 SB |
1161 | |
1162 | sf->error = btrfsic_create_link_to_next_block( | |
1163 | state, | |
1164 | sf->block, | |
1165 | sf->block_ctx, | |
1166 | next_bytenr, | |
1167 | sf->limit_nesting, | |
1168 | &sf->next_block_ctx, | |
1169 | &sf->next_block, | |
1170 | force_iodone_flag, | |
1171 | &sf->num_copies, | |
1172 | &sf->mirror_num, | |
e06baab4 | 1173 | &key_ptr.key, |
3cae210f | 1174 | btrfs_stack_key_generation(&key_ptr)); |
5db02760 SB |
1175 | if (sf->error) |
1176 | goto one_stack_frame_backwards; | |
1177 | ||
1178 | if (NULL != sf->next_block) { | |
1179 | struct btrfs_header *const next_hdr = | |
1180 | (struct btrfs_header *) | |
e06baab4 | 1181 | sf->next_block_ctx.datav[0]; |
5db02760 SB |
1182 | |
1183 | next_stack = btrfsic_stack_frame_alloc(); | |
1184 | if (NULL == next_stack) | |
1185 | goto one_stack_frame_backwards; | |
1186 | ||
1187 | next_stack->i = -1; | |
1188 | next_stack->block = sf->next_block; | |
1189 | next_stack->block_ctx = &sf->next_block_ctx; | |
1190 | next_stack->next_block = NULL; | |
1191 | next_stack->hdr = next_hdr; | |
1192 | next_stack->limit_nesting = | |
1193 | sf->limit_nesting - 1; | |
1194 | next_stack->prev = sf; | |
1195 | sf = next_stack; | |
1196 | goto continue_with_new_stack_frame; | |
1197 | } | |
1198 | ||
1199 | goto continue_with_current_node_stack_frame; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | one_stack_frame_backwards: | |
1204 | if (NULL != sf->prev) { | |
1205 | struct btrfsic_stack_frame *const prev = sf->prev; | |
1206 | ||
1207 | /* the one for the initial block is freed in the caller */ | |
1208 | btrfsic_release_block_ctx(sf->block_ctx); | |
1209 | ||
1210 | if (sf->error) { | |
1211 | prev->error = sf->error; | |
1212 | btrfsic_stack_frame_free(sf); | |
1213 | sf = prev; | |
1214 | goto one_stack_frame_backwards; | |
1215 | } | |
1216 | ||
1217 | btrfsic_stack_frame_free(sf); | |
1218 | sf = prev; | |
1219 | goto continue_with_new_stack_frame; | |
1220 | } else { | |
1221 | BUG_ON(&initial_stack_frame != sf); | |
1222 | } | |
1223 | ||
1224 | return sf->error; | |
1225 | } | |
1226 | ||
e06baab4 SB |
1227 | static void btrfsic_read_from_block_data( |
1228 | struct btrfsic_block_data_ctx *block_ctx, | |
1229 | void *dstv, u32 offset, size_t len) | |
1230 | { | |
1231 | size_t cur; | |
1232 | size_t offset_in_page; | |
1233 | char *kaddr; | |
1234 | char *dst = (char *)dstv; | |
1235 | size_t start_offset = block_ctx->start & ((u64)PAGE_CACHE_SIZE - 1); | |
1236 | unsigned long i = (start_offset + offset) >> PAGE_CACHE_SHIFT; | |
1237 | ||
1238 | WARN_ON(offset + len > block_ctx->len); | |
778746b5 | 1239 | offset_in_page = (start_offset + offset) & (PAGE_CACHE_SIZE - 1); |
e06baab4 SB |
1240 | |
1241 | while (len > 0) { | |
1242 | cur = min(len, ((size_t)PAGE_CACHE_SIZE - offset_in_page)); | |
1243 | BUG_ON(i >= (block_ctx->len + PAGE_CACHE_SIZE - 1) >> | |
1244 | PAGE_CACHE_SHIFT); | |
1245 | kaddr = block_ctx->datav[i]; | |
1246 | memcpy(dst, kaddr + offset_in_page, cur); | |
1247 | ||
1248 | dst += cur; | |
1249 | len -= cur; | |
1250 | offset_in_page = 0; | |
1251 | i++; | |
1252 | } | |
1253 | } | |
1254 | ||
5db02760 SB |
1255 | static int btrfsic_create_link_to_next_block( |
1256 | struct btrfsic_state *state, | |
1257 | struct btrfsic_block *block, | |
1258 | struct btrfsic_block_data_ctx *block_ctx, | |
1259 | u64 next_bytenr, | |
1260 | int limit_nesting, | |
1261 | struct btrfsic_block_data_ctx *next_block_ctx, | |
1262 | struct btrfsic_block **next_blockp, | |
1263 | int force_iodone_flag, | |
1264 | int *num_copiesp, int *mirror_nump, | |
1265 | struct btrfs_disk_key *disk_key, | |
1266 | u64 parent_generation) | |
1267 | { | |
1268 | struct btrfsic_block *next_block = NULL; | |
1269 | int ret; | |
1270 | struct btrfsic_block_link *l; | |
1271 | int did_alloc_block_link; | |
1272 | int block_was_created; | |
1273 | ||
1274 | *next_blockp = NULL; | |
1275 | if (0 == *num_copiesp) { | |
1276 | *num_copiesp = | |
5d964051 | 1277 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 1278 | next_bytenr, state->metablock_size); |
5db02760 SB |
1279 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
1280 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 1281 | next_bytenr, *num_copiesp); |
5db02760 SB |
1282 | *mirror_nump = 1; |
1283 | } | |
1284 | ||
1285 | if (*mirror_nump > *num_copiesp) | |
1286 | return 0; | |
1287 | ||
1288 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1289 | printk(KERN_INFO | |
1290 | "btrfsic_create_link_to_next_block(mirror_num=%d)\n", | |
1291 | *mirror_nump); | |
1292 | ret = btrfsic_map_block(state, next_bytenr, | |
e06baab4 | 1293 | state->metablock_size, |
5db02760 SB |
1294 | next_block_ctx, *mirror_nump); |
1295 | if (ret) { | |
1296 | printk(KERN_INFO | |
1297 | "btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n", | |
c1c9ff7c | 1298 | next_bytenr, *mirror_nump); |
5db02760 SB |
1299 | btrfsic_release_block_ctx(next_block_ctx); |
1300 | *next_blockp = NULL; | |
1301 | return -1; | |
1302 | } | |
1303 | ||
1304 | next_block = btrfsic_block_lookup_or_add(state, | |
1305 | next_block_ctx, "referenced ", | |
1306 | 1, force_iodone_flag, | |
1307 | !force_iodone_flag, | |
1308 | *mirror_nump, | |
1309 | &block_was_created); | |
1310 | if (NULL == next_block) { | |
1311 | btrfsic_release_block_ctx(next_block_ctx); | |
1312 | *next_blockp = NULL; | |
1313 | return -1; | |
1314 | } | |
1315 | if (block_was_created) { | |
1316 | l = NULL; | |
1317 | next_block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
1318 | } else { | |
1319 | if (next_block->logical_bytenr != next_bytenr && | |
1320 | !(!next_block->is_metadata && | |
1321 | 0 == next_block->logical_bytenr)) { | |
1322 | printk(KERN_INFO | |
1323 | "Referenced block @%llu (%s/%llu/%d)" | |
1324 | " found in hash table, %c," | |
1325 | " bytenr mismatch (!= stored %llu).\n", | |
c1c9ff7c GU |
1326 | next_bytenr, next_block_ctx->dev->name, |
1327 | next_block_ctx->dev_bytenr, *mirror_nump, | |
5db02760 | 1328 | btrfsic_get_block_type(state, next_block), |
c1c9ff7c | 1329 | next_block->logical_bytenr); |
5db02760 SB |
1330 | } else if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
1331 | printk(KERN_INFO | |
1332 | "Referenced block @%llu (%s/%llu/%d)" | |
1333 | " found in hash table, %c.\n", | |
c1c9ff7c GU |
1334 | next_bytenr, next_block_ctx->dev->name, |
1335 | next_block_ctx->dev_bytenr, *mirror_nump, | |
5db02760 SB |
1336 | btrfsic_get_block_type(state, next_block)); |
1337 | next_block->logical_bytenr = next_bytenr; | |
1338 | ||
1339 | next_block->mirror_num = *mirror_nump; | |
1340 | l = btrfsic_block_link_hashtable_lookup( | |
1341 | next_block_ctx->dev->bdev, | |
1342 | next_block_ctx->dev_bytenr, | |
1343 | block_ctx->dev->bdev, | |
1344 | block_ctx->dev_bytenr, | |
1345 | &state->block_link_hashtable); | |
1346 | } | |
1347 | ||
1348 | next_block->disk_key = *disk_key; | |
1349 | if (NULL == l) { | |
1350 | l = btrfsic_block_link_alloc(); | |
1351 | if (NULL == l) { | |
1352 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
1353 | btrfsic_release_block_ctx(next_block_ctx); | |
1354 | *next_blockp = NULL; | |
1355 | return -1; | |
1356 | } | |
1357 | ||
1358 | did_alloc_block_link = 1; | |
1359 | l->block_ref_to = next_block; | |
1360 | l->block_ref_from = block; | |
1361 | l->ref_cnt = 1; | |
1362 | l->parent_generation = parent_generation; | |
1363 | ||
1364 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1365 | btrfsic_print_add_link(state, l); | |
1366 | ||
1367 | list_add(&l->node_ref_to, &block->ref_to_list); | |
1368 | list_add(&l->node_ref_from, &next_block->ref_from_list); | |
1369 | ||
1370 | btrfsic_block_link_hashtable_add(l, | |
1371 | &state->block_link_hashtable); | |
1372 | } else { | |
1373 | did_alloc_block_link = 0; | |
1374 | if (0 == limit_nesting) { | |
1375 | l->ref_cnt++; | |
1376 | l->parent_generation = parent_generation; | |
1377 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1378 | btrfsic_print_add_link(state, l); | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | if (limit_nesting > 0 && did_alloc_block_link) { | |
1383 | ret = btrfsic_read_block(state, next_block_ctx); | |
e06baab4 | 1384 | if (ret < (int)next_block_ctx->len) { |
5db02760 SB |
1385 | printk(KERN_INFO |
1386 | "btrfsic: read block @logical %llu failed!\n", | |
c1c9ff7c | 1387 | next_bytenr); |
5db02760 SB |
1388 | btrfsic_release_block_ctx(next_block_ctx); |
1389 | *next_blockp = NULL; | |
1390 | return -1; | |
1391 | } | |
1392 | ||
1393 | *next_blockp = next_block; | |
1394 | } else { | |
1395 | *next_blockp = NULL; | |
1396 | } | |
1397 | (*mirror_nump)++; | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static int btrfsic_handle_extent_data( | |
1403 | struct btrfsic_state *state, | |
1404 | struct btrfsic_block *block, | |
1405 | struct btrfsic_block_data_ctx *block_ctx, | |
1406 | u32 item_offset, int force_iodone_flag) | |
1407 | { | |
1408 | int ret; | |
e06baab4 SB |
1409 | struct btrfs_file_extent_item file_extent_item; |
1410 | u64 file_extent_item_offset; | |
1411 | u64 next_bytenr; | |
1412 | u64 num_bytes; | |
1413 | u64 generation; | |
5db02760 SB |
1414 | struct btrfsic_block_link *l; |
1415 | ||
e06baab4 SB |
1416 | file_extent_item_offset = offsetof(struct btrfs_leaf, items) + |
1417 | item_offset; | |
86ff7ffc SB |
1418 | if (file_extent_item_offset + |
1419 | offsetof(struct btrfs_file_extent_item, disk_num_bytes) > | |
1420 | block_ctx->len) { | |
1421 | printk(KERN_INFO | |
1422 | "btrfsic: file item out of bounce at logical %llu, dev %s\n", | |
1423 | block_ctx->start, block_ctx->dev->name); | |
1424 | return -1; | |
1425 | } | |
1426 | ||
1427 | btrfsic_read_from_block_data(block_ctx, &file_extent_item, | |
1428 | file_extent_item_offset, | |
1429 | offsetof(struct btrfs_file_extent_item, disk_num_bytes)); | |
1430 | if (BTRFS_FILE_EXTENT_REG != file_extent_item.type || | |
3cae210f | 1431 | btrfs_stack_file_extent_disk_bytenr(&file_extent_item) == 0) { |
86ff7ffc SB |
1432 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) |
1433 | printk(KERN_INFO "extent_data: type %u, disk_bytenr = %llu\n", | |
1434 | file_extent_item.type, | |
3cae210f QW |
1435 | btrfs_stack_file_extent_disk_bytenr( |
1436 | &file_extent_item)); | |
86ff7ffc SB |
1437 | return 0; |
1438 | } | |
1439 | ||
e06baab4 SB |
1440 | if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) > |
1441 | block_ctx->len) { | |
1442 | printk(KERN_INFO | |
1443 | "btrfsic: file item out of bounce at logical %llu, dev %s\n", | |
1444 | block_ctx->start, block_ctx->dev->name); | |
1445 | return -1; | |
1446 | } | |
1447 | btrfsic_read_from_block_data(block_ctx, &file_extent_item, | |
1448 | file_extent_item_offset, | |
1449 | sizeof(struct btrfs_file_extent_item)); | |
3cae210f QW |
1450 | next_bytenr = btrfs_stack_file_extent_disk_bytenr(&file_extent_item) + |
1451 | btrfs_stack_file_extent_offset(&file_extent_item); | |
1452 | generation = btrfs_stack_file_extent_generation(&file_extent_item); | |
1453 | num_bytes = btrfs_stack_file_extent_num_bytes(&file_extent_item); | |
1454 | generation = btrfs_stack_file_extent_generation(&file_extent_item); | |
e06baab4 | 1455 | |
5db02760 SB |
1456 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) |
1457 | printk(KERN_INFO "extent_data: type %u, disk_bytenr = %llu," | |
1458 | " offset = %llu, num_bytes = %llu\n", | |
e06baab4 | 1459 | file_extent_item.type, |
3cae210f | 1460 | btrfs_stack_file_extent_disk_bytenr(&file_extent_item), |
3cae210f | 1461 | btrfs_stack_file_extent_offset(&file_extent_item), |
c1c9ff7c | 1462 | num_bytes); |
5db02760 SB |
1463 | while (num_bytes > 0) { |
1464 | u32 chunk_len; | |
1465 | int num_copies; | |
1466 | int mirror_num; | |
1467 | ||
e06baab4 SB |
1468 | if (num_bytes > state->datablock_size) |
1469 | chunk_len = state->datablock_size; | |
5db02760 SB |
1470 | else |
1471 | chunk_len = num_bytes; | |
1472 | ||
1473 | num_copies = | |
5d964051 | 1474 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 1475 | next_bytenr, state->datablock_size); |
5db02760 SB |
1476 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
1477 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 1478 | next_bytenr, num_copies); |
5db02760 SB |
1479 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
1480 | struct btrfsic_block_data_ctx next_block_ctx; | |
1481 | struct btrfsic_block *next_block; | |
1482 | int block_was_created; | |
1483 | ||
1484 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1485 | printk(KERN_INFO "btrfsic_handle_extent_data(" | |
1486 | "mirror_num=%d)\n", mirror_num); | |
1487 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE) | |
1488 | printk(KERN_INFO | |
1489 | "\tdisk_bytenr = %llu, num_bytes %u\n", | |
c1c9ff7c | 1490 | next_bytenr, chunk_len); |
5db02760 SB |
1491 | ret = btrfsic_map_block(state, next_bytenr, |
1492 | chunk_len, &next_block_ctx, | |
1493 | mirror_num); | |
1494 | if (ret) { | |
1495 | printk(KERN_INFO | |
1496 | "btrfsic: btrfsic_map_block(@%llu," | |
1497 | " mirror=%d) failed!\n", | |
c1c9ff7c | 1498 | next_bytenr, mirror_num); |
5db02760 SB |
1499 | return -1; |
1500 | } | |
1501 | ||
1502 | next_block = btrfsic_block_lookup_or_add( | |
1503 | state, | |
1504 | &next_block_ctx, | |
1505 | "referenced ", | |
1506 | 0, | |
1507 | force_iodone_flag, | |
1508 | !force_iodone_flag, | |
1509 | mirror_num, | |
1510 | &block_was_created); | |
1511 | if (NULL == next_block) { | |
1512 | printk(KERN_INFO | |
1513 | "btrfsic: error, kmalloc failed!\n"); | |
1514 | btrfsic_release_block_ctx(&next_block_ctx); | |
1515 | return -1; | |
1516 | } | |
1517 | if (!block_was_created) { | |
1518 | if (next_block->logical_bytenr != next_bytenr && | |
1519 | !(!next_block->is_metadata && | |
1520 | 0 == next_block->logical_bytenr)) { | |
1521 | printk(KERN_INFO | |
1522 | "Referenced block" | |
1523 | " @%llu (%s/%llu/%d)" | |
1524 | " found in hash table, D," | |
1525 | " bytenr mismatch" | |
1526 | " (!= stored %llu).\n", | |
c1c9ff7c | 1527 | next_bytenr, |
5db02760 | 1528 | next_block_ctx.dev->name, |
5db02760 SB |
1529 | next_block_ctx.dev_bytenr, |
1530 | mirror_num, | |
5db02760 SB |
1531 | next_block->logical_bytenr); |
1532 | } | |
1533 | next_block->logical_bytenr = next_bytenr; | |
1534 | next_block->mirror_num = mirror_num; | |
1535 | } | |
1536 | ||
1537 | l = btrfsic_block_link_lookup_or_add(state, | |
1538 | &next_block_ctx, | |
1539 | next_block, block, | |
1540 | generation); | |
1541 | btrfsic_release_block_ctx(&next_block_ctx); | |
1542 | if (NULL == l) | |
1543 | return -1; | |
1544 | } | |
1545 | ||
1546 | next_bytenr += chunk_len; | |
1547 | num_bytes -= chunk_len; | |
1548 | } | |
1549 | ||
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len, | |
1554 | struct btrfsic_block_data_ctx *block_ctx_out, | |
1555 | int mirror_num) | |
1556 | { | |
1557 | int ret; | |
1558 | u64 length; | |
1559 | struct btrfs_bio *multi = NULL; | |
1560 | struct btrfs_device *device; | |
1561 | ||
1562 | length = len; | |
3ec706c8 | 1563 | ret = btrfs_map_block(state->root->fs_info, READ, |
5db02760 SB |
1564 | bytenr, &length, &multi, mirror_num); |
1565 | ||
61891923 SB |
1566 | if (ret) { |
1567 | block_ctx_out->start = 0; | |
1568 | block_ctx_out->dev_bytenr = 0; | |
1569 | block_ctx_out->len = 0; | |
1570 | block_ctx_out->dev = NULL; | |
1571 | block_ctx_out->datav = NULL; | |
1572 | block_ctx_out->pagev = NULL; | |
1573 | block_ctx_out->mem_to_free = NULL; | |
1574 | ||
1575 | return ret; | |
1576 | } | |
1577 | ||
5db02760 SB |
1578 | device = multi->stripes[0].dev; |
1579 | block_ctx_out->dev = btrfsic_dev_state_lookup(device->bdev); | |
1580 | block_ctx_out->dev_bytenr = multi->stripes[0].physical; | |
1581 | block_ctx_out->start = bytenr; | |
1582 | block_ctx_out->len = len; | |
e06baab4 SB |
1583 | block_ctx_out->datav = NULL; |
1584 | block_ctx_out->pagev = NULL; | |
1585 | block_ctx_out->mem_to_free = NULL; | |
5db02760 | 1586 | |
61891923 | 1587 | kfree(multi); |
5db02760 SB |
1588 | if (NULL == block_ctx_out->dev) { |
1589 | ret = -ENXIO; | |
1590 | printk(KERN_INFO "btrfsic: error, cannot lookup dev (#1)!\n"); | |
1591 | } | |
1592 | ||
1593 | return ret; | |
1594 | } | |
1595 | ||
1596 | static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr, | |
1597 | u32 len, struct block_device *bdev, | |
1598 | struct btrfsic_block_data_ctx *block_ctx_out) | |
1599 | { | |
1600 | block_ctx_out->dev = btrfsic_dev_state_lookup(bdev); | |
1601 | block_ctx_out->dev_bytenr = bytenr; | |
1602 | block_ctx_out->start = bytenr; | |
1603 | block_ctx_out->len = len; | |
e06baab4 SB |
1604 | block_ctx_out->datav = NULL; |
1605 | block_ctx_out->pagev = NULL; | |
1606 | block_ctx_out->mem_to_free = NULL; | |
5db02760 SB |
1607 | if (NULL != block_ctx_out->dev) { |
1608 | return 0; | |
1609 | } else { | |
1610 | printk(KERN_INFO "btrfsic: error, cannot lookup dev (#2)!\n"); | |
1611 | return -ENXIO; | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx) | |
1616 | { | |
e06baab4 SB |
1617 | if (block_ctx->mem_to_free) { |
1618 | unsigned int num_pages; | |
1619 | ||
1620 | BUG_ON(!block_ctx->datav); | |
1621 | BUG_ON(!block_ctx->pagev); | |
1622 | num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >> | |
1623 | PAGE_CACHE_SHIFT; | |
1624 | while (num_pages > 0) { | |
1625 | num_pages--; | |
1626 | if (block_ctx->datav[num_pages]) { | |
1627 | kunmap(block_ctx->pagev[num_pages]); | |
1628 | block_ctx->datav[num_pages] = NULL; | |
1629 | } | |
1630 | if (block_ctx->pagev[num_pages]) { | |
1631 | __free_page(block_ctx->pagev[num_pages]); | |
1632 | block_ctx->pagev[num_pages] = NULL; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | kfree(block_ctx->mem_to_free); | |
1637 | block_ctx->mem_to_free = NULL; | |
1638 | block_ctx->pagev = NULL; | |
1639 | block_ctx->datav = NULL; | |
5db02760 SB |
1640 | } |
1641 | } | |
1642 | ||
1643 | static int btrfsic_read_block(struct btrfsic_state *state, | |
1644 | struct btrfsic_block_data_ctx *block_ctx) | |
1645 | { | |
e06baab4 SB |
1646 | unsigned int num_pages; |
1647 | unsigned int i; | |
1648 | u64 dev_bytenr; | |
1649 | int ret; | |
1650 | ||
1651 | BUG_ON(block_ctx->datav); | |
1652 | BUG_ON(block_ctx->pagev); | |
1653 | BUG_ON(block_ctx->mem_to_free); | |
1654 | if (block_ctx->dev_bytenr & ((u64)PAGE_CACHE_SIZE - 1)) { | |
5db02760 SB |
1655 | printk(KERN_INFO |
1656 | "btrfsic: read_block() with unaligned bytenr %llu\n", | |
c1c9ff7c | 1657 | block_ctx->dev_bytenr); |
5db02760 SB |
1658 | return -1; |
1659 | } | |
e06baab4 SB |
1660 | |
1661 | num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >> | |
1662 | PAGE_CACHE_SHIFT; | |
1663 | block_ctx->mem_to_free = kzalloc((sizeof(*block_ctx->datav) + | |
1664 | sizeof(*block_ctx->pagev)) * | |
1665 | num_pages, GFP_NOFS); | |
1666 | if (!block_ctx->mem_to_free) | |
5db02760 | 1667 | return -1; |
e06baab4 SB |
1668 | block_ctx->datav = block_ctx->mem_to_free; |
1669 | block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages); | |
1670 | for (i = 0; i < num_pages; i++) { | |
1671 | block_ctx->pagev[i] = alloc_page(GFP_NOFS); | |
1672 | if (!block_ctx->pagev[i]) | |
1673 | return -1; | |
5db02760 SB |
1674 | } |
1675 | ||
e06baab4 SB |
1676 | dev_bytenr = block_ctx->dev_bytenr; |
1677 | for (i = 0; i < num_pages;) { | |
1678 | struct bio *bio; | |
1679 | unsigned int j; | |
1680 | DECLARE_COMPLETION_ONSTACK(complete); | |
1681 | ||
9be3395b | 1682 | bio = btrfs_io_bio_alloc(GFP_NOFS, num_pages - i); |
e06baab4 SB |
1683 | if (!bio) { |
1684 | printk(KERN_INFO | |
1685 | "btrfsic: bio_alloc() for %u pages failed!\n", | |
1686 | num_pages - i); | |
1687 | return -1; | |
1688 | } | |
1689 | bio->bi_bdev = block_ctx->dev->bdev; | |
1690 | bio->bi_sector = dev_bytenr >> 9; | |
1691 | bio->bi_end_io = btrfsic_complete_bio_end_io; | |
1692 | bio->bi_private = &complete; | |
1693 | ||
1694 | for (j = i; j < num_pages; j++) { | |
1695 | ret = bio_add_page(bio, block_ctx->pagev[j], | |
1696 | PAGE_CACHE_SIZE, 0); | |
1697 | if (PAGE_CACHE_SIZE != ret) | |
1698 | break; | |
1699 | } | |
1700 | if (j == i) { | |
1701 | printk(KERN_INFO | |
1702 | "btrfsic: error, failed to add a single page!\n"); | |
1703 | return -1; | |
1704 | } | |
1705 | submit_bio(READ, bio); | |
1706 | ||
1707 | /* this will also unplug the queue */ | |
1708 | wait_for_completion(&complete); | |
1709 | ||
1710 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
1711 | printk(KERN_INFO | |
1712 | "btrfsic: read error at logical %llu dev %s!\n", | |
1713 | block_ctx->start, block_ctx->dev->name); | |
1714 | bio_put(bio); | |
1715 | return -1; | |
1716 | } | |
1717 | bio_put(bio); | |
1718 | dev_bytenr += (j - i) * PAGE_CACHE_SIZE; | |
1719 | i = j; | |
1720 | } | |
1721 | for (i = 0; i < num_pages; i++) { | |
1722 | block_ctx->datav[i] = kmap(block_ctx->pagev[i]); | |
1723 | if (!block_ctx->datav[i]) { | |
1724 | printk(KERN_INFO "btrfsic: kmap() failed (dev %s)!\n", | |
1725 | block_ctx->dev->name); | |
1726 | return -1; | |
1727 | } | |
1728 | } | |
5db02760 SB |
1729 | |
1730 | return block_ctx->len; | |
1731 | } | |
1732 | ||
e06baab4 SB |
1733 | static void btrfsic_complete_bio_end_io(struct bio *bio, int err) |
1734 | { | |
1735 | complete((struct completion *)bio->bi_private); | |
1736 | } | |
1737 | ||
5db02760 SB |
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 | ||
1826 | crc = crc32c(crc, data, sublen); | |
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 SB |
1902 | } |
1903 | if (block->logical_bytenr != bytenr) { | |
1904 | printk(KERN_INFO | |
1905 | "Written block @%llu (%s/%llu/%d)" | |
1906 | " found in hash table, %c," | |
1907 | " bytenr mismatch" | |
1908 | " (!= stored %llu).\n", | |
c1c9ff7c | 1909 | bytenr, dev_state->name, dev_bytenr, |
5db02760 SB |
1910 | block->mirror_num, |
1911 | btrfsic_get_block_type(state, block), | |
5db02760 SB |
1912 | block->logical_bytenr); |
1913 | block->logical_bytenr = bytenr; | |
1914 | } else if (state->print_mask & | |
1915 | BTRFSIC_PRINT_MASK_VERBOSE) | |
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)); | |
1922 | } else { | |
e06baab4 SB |
1923 | if (num_pages * PAGE_CACHE_SIZE < |
1924 | state->datablock_size) { | |
1925 | printk(KERN_INFO | |
1926 | "btrfsic: cannot work with too short bios!\n"); | |
1927 | return; | |
1928 | } | |
1929 | processed_len = state->datablock_size; | |
5db02760 SB |
1930 | bytenr = block->logical_bytenr; |
1931 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1932 | printk(KERN_INFO | |
1933 | "Written block @%llu (%s/%llu/%d)" | |
1934 | " found in hash table, %c.\n", | |
c1c9ff7c | 1935 | bytenr, dev_state->name, dev_bytenr, |
5db02760 SB |
1936 | block->mirror_num, |
1937 | btrfsic_get_block_type(state, block)); | |
1938 | } | |
1939 | ||
1940 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1941 | printk(KERN_INFO | |
1942 | "ref_to_list: %cE, ref_from_list: %cE\n", | |
1943 | list_empty(&block->ref_to_list) ? ' ' : '!', | |
1944 | list_empty(&block->ref_from_list) ? ' ' : '!'); | |
1945 | if (btrfsic_is_block_ref_by_superblock(state, block, 0)) { | |
1946 | printk(KERN_INFO "btrfs: attempt to overwrite %c-block" | |
1947 | " @%llu (%s/%llu/%d), old(gen=%llu," | |
1948 | " objectid=%llu, type=%d, offset=%llu)," | |
1949 | " new(gen=%llu)," | |
1950 | " which is referenced by most recent superblock" | |
1951 | " (superblockgen=%llu)!\n", | |
c1c9ff7c GU |
1952 | btrfsic_get_block_type(state, block), bytenr, |
1953 | dev_state->name, dev_bytenr, block->mirror_num, | |
1954 | block->generation, | |
3cae210f | 1955 | btrfs_disk_key_objectid(&block->disk_key), |
5db02760 | 1956 | block->disk_key.type, |
3cae210f | 1957 | btrfs_disk_key_offset(&block->disk_key), |
3cae210f QW |
1958 | btrfs_stack_header_generation( |
1959 | (struct btrfs_header *) mapped_datav[0]), | |
5db02760 SB |
1960 | state->max_superblock_generation); |
1961 | btrfsic_dump_tree(state); | |
1962 | } | |
1963 | ||
1964 | if (!block->is_iodone && !block->never_written) { | |
1965 | printk(KERN_INFO "btrfs: attempt to overwrite %c-block" | |
1966 | " @%llu (%s/%llu/%d), oldgen=%llu, newgen=%llu," | |
1967 | " which is not yet iodone!\n", | |
c1c9ff7c GU |
1968 | btrfsic_get_block_type(state, block), bytenr, |
1969 | dev_state->name, dev_bytenr, block->mirror_num, | |
1970 | block->generation, | |
3cae210f QW |
1971 | btrfs_stack_header_generation( |
1972 | (struct btrfs_header *) | |
1973 | mapped_datav[0])); | |
5db02760 SB |
1974 | /* it would not be safe to go on */ |
1975 | btrfsic_dump_tree(state); | |
e06baab4 | 1976 | goto continue_loop; |
5db02760 SB |
1977 | } |
1978 | ||
1979 | /* | |
1980 | * Clear all references of this block. Do not free | |
1981 | * the block itself even if is not referenced anymore | |
1982 | * because it still carries valueable information | |
1983 | * like whether it was ever written and IO completed. | |
1984 | */ | |
1985 | list_for_each_safe(elem_ref_to, tmp_ref_to, | |
1986 | &block->ref_to_list) { | |
1987 | struct btrfsic_block_link *const l = | |
1988 | list_entry(elem_ref_to, | |
1989 | struct btrfsic_block_link, | |
1990 | node_ref_to); | |
1991 | ||
1992 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
1993 | btrfsic_print_rem_link(state, l); | |
1994 | l->ref_cnt--; | |
1995 | if (0 == l->ref_cnt) { | |
1996 | list_del(&l->node_ref_to); | |
1997 | list_del(&l->node_ref_from); | |
1998 | btrfsic_block_link_hashtable_remove(l); | |
1999 | btrfsic_block_link_free(l); | |
2000 | } | |
2001 | } | |
2002 | ||
2003 | if (block->is_superblock) | |
e06baab4 SB |
2004 | ret = btrfsic_map_superblock(state, bytenr, |
2005 | processed_len, | |
5db02760 SB |
2006 | bdev, &block_ctx); |
2007 | else | |
e06baab4 | 2008 | ret = btrfsic_map_block(state, bytenr, processed_len, |
5db02760 SB |
2009 | &block_ctx, 0); |
2010 | if (ret) { | |
2011 | printk(KERN_INFO | |
2012 | "btrfsic: btrfsic_map_block(root @%llu)" | |
c1c9ff7c | 2013 | " failed!\n", bytenr); |
e06baab4 | 2014 | goto continue_loop; |
5db02760 | 2015 | } |
e06baab4 | 2016 | block_ctx.datav = mapped_datav; |
5db02760 SB |
2017 | /* the following is required in case of writes to mirrors, |
2018 | * use the same that was used for the lookup */ | |
2019 | block_ctx.dev = dev_state; | |
2020 | block_ctx.dev_bytenr = dev_bytenr; | |
2021 | ||
2022 | if (is_metadata || state->include_extent_data) { | |
2023 | block->never_written = 0; | |
2024 | block->iodone_w_error = 0; | |
2025 | if (NULL != bio) { | |
2026 | block->is_iodone = 0; | |
2027 | BUG_ON(NULL == bio_is_patched); | |
2028 | if (!*bio_is_patched) { | |
2029 | block->orig_bio_bh_private = | |
2030 | bio->bi_private; | |
2031 | block->orig_bio_bh_end_io.bio = | |
2032 | bio->bi_end_io; | |
2033 | block->next_in_same_bio = NULL; | |
2034 | bio->bi_private = block; | |
2035 | bio->bi_end_io = btrfsic_bio_end_io; | |
2036 | *bio_is_patched = 1; | |
2037 | } else { | |
2038 | struct btrfsic_block *chained_block = | |
2039 | (struct btrfsic_block *) | |
2040 | bio->bi_private; | |
2041 | ||
2042 | BUG_ON(NULL == chained_block); | |
2043 | block->orig_bio_bh_private = | |
2044 | chained_block->orig_bio_bh_private; | |
2045 | block->orig_bio_bh_end_io.bio = | |
2046 | chained_block->orig_bio_bh_end_io. | |
2047 | bio; | |
2048 | block->next_in_same_bio = chained_block; | |
2049 | bio->bi_private = block; | |
2050 | } | |
2051 | } else if (NULL != bh) { | |
2052 | block->is_iodone = 0; | |
2053 | block->orig_bio_bh_private = bh->b_private; | |
2054 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2055 | block->next_in_same_bio = NULL; | |
2056 | bh->b_private = block; | |
2057 | bh->b_end_io = btrfsic_bh_end_io; | |
2058 | } else { | |
2059 | block->is_iodone = 1; | |
2060 | block->orig_bio_bh_private = NULL; | |
2061 | block->orig_bio_bh_end_io.bio = NULL; | |
2062 | block->next_in_same_bio = NULL; | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2067 | block->submit_bio_bh_rw = submit_bio_bh_rw; | |
2068 | if (is_metadata) { | |
2069 | block->logical_bytenr = bytenr; | |
2070 | block->is_metadata = 1; | |
2071 | if (block->is_superblock) { | |
e06baab4 SB |
2072 | BUG_ON(PAGE_CACHE_SIZE != |
2073 | BTRFS_SUPER_INFO_SIZE); | |
5db02760 SB |
2074 | ret = btrfsic_process_written_superblock( |
2075 | state, | |
2076 | block, | |
2077 | (struct btrfs_super_block *) | |
e06baab4 | 2078 | mapped_datav[0]); |
5db02760 SB |
2079 | if (state->print_mask & |
2080 | BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE) { | |
2081 | printk(KERN_INFO | |
2082 | "[after new superblock is written]:\n"); | |
2083 | btrfsic_dump_tree_sub(state, block, 0); | |
2084 | } | |
2085 | } else { | |
2086 | block->mirror_num = 0; /* unknown */ | |
2087 | ret = btrfsic_process_metablock( | |
2088 | state, | |
2089 | block, | |
2090 | &block_ctx, | |
5db02760 SB |
2091 | 0, 0); |
2092 | } | |
2093 | if (ret) | |
2094 | printk(KERN_INFO | |
2095 | "btrfsic: btrfsic_process_metablock" | |
2096 | "(root @%llu) failed!\n", | |
c1c9ff7c | 2097 | dev_bytenr); |
5db02760 SB |
2098 | } else { |
2099 | block->is_metadata = 0; | |
2100 | block->mirror_num = 0; /* unknown */ | |
2101 | block->generation = BTRFSIC_GENERATION_UNKNOWN; | |
2102 | if (!state->include_extent_data | |
2103 | && list_empty(&block->ref_from_list)) { | |
2104 | /* | |
2105 | * disk block is overwritten with extent | |
2106 | * data (not meta data) and we are configured | |
2107 | * to not include extent data: take the | |
2108 | * chance and free the block's memory | |
2109 | */ | |
2110 | btrfsic_block_hashtable_remove(block); | |
2111 | list_del(&block->all_blocks_node); | |
2112 | btrfsic_block_free(block); | |
2113 | } | |
2114 | } | |
2115 | btrfsic_release_block_ctx(&block_ctx); | |
2116 | } else { | |
2117 | /* block has not been found in hash table */ | |
2118 | u64 bytenr; | |
2119 | ||
2120 | if (!is_metadata) { | |
e06baab4 | 2121 | processed_len = state->datablock_size; |
5db02760 SB |
2122 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
2123 | printk(KERN_INFO "Written block (%s/%llu/?)" | |
2124 | " !found in hash table, D.\n", | |
c1c9ff7c | 2125 | dev_state->name, dev_bytenr); |
e06baab4 SB |
2126 | if (!state->include_extent_data) { |
2127 | /* ignore that written D block */ | |
2128 | goto continue_loop; | |
2129 | } | |
5db02760 SB |
2130 | |
2131 | /* this is getting ugly for the | |
2132 | * include_extent_data case... */ | |
2133 | bytenr = 0; /* unknown */ | |
2134 | block_ctx.start = bytenr; | |
e06baab4 SB |
2135 | block_ctx.len = processed_len; |
2136 | block_ctx.mem_to_free = NULL; | |
2137 | block_ctx.pagev = NULL; | |
5db02760 | 2138 | } else { |
e06baab4 | 2139 | processed_len = state->metablock_size; |
3cae210f QW |
2140 | bytenr = btrfs_stack_header_bytenr( |
2141 | (struct btrfs_header *) | |
2142 | mapped_datav[0]); | |
5db02760 | 2143 | btrfsic_cmp_log_and_dev_bytenr(state, bytenr, dev_state, |
e06baab4 | 2144 | dev_bytenr); |
5db02760 SB |
2145 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) |
2146 | printk(KERN_INFO | |
2147 | "Written block @%llu (%s/%llu/?)" | |
2148 | " !found in hash table, M.\n", | |
c1c9ff7c | 2149 | bytenr, dev_state->name, dev_bytenr); |
5db02760 | 2150 | |
e06baab4 SB |
2151 | ret = btrfsic_map_block(state, bytenr, processed_len, |
2152 | &block_ctx, 0); | |
5db02760 SB |
2153 | if (ret) { |
2154 | printk(KERN_INFO | |
2155 | "btrfsic: btrfsic_map_block(root @%llu)" | |
2156 | " failed!\n", | |
c1c9ff7c | 2157 | dev_bytenr); |
e06baab4 | 2158 | goto continue_loop; |
5db02760 SB |
2159 | } |
2160 | } | |
e06baab4 | 2161 | block_ctx.datav = mapped_datav; |
5db02760 SB |
2162 | /* the following is required in case of writes to mirrors, |
2163 | * use the same that was used for the lookup */ | |
2164 | block_ctx.dev = dev_state; | |
2165 | block_ctx.dev_bytenr = dev_bytenr; | |
2166 | ||
2167 | block = btrfsic_block_alloc(); | |
2168 | if (NULL == block) { | |
2169 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
2170 | btrfsic_release_block_ctx(&block_ctx); | |
e06baab4 | 2171 | goto continue_loop; |
5db02760 SB |
2172 | } |
2173 | block->dev_state = dev_state; | |
2174 | block->dev_bytenr = dev_bytenr; | |
2175 | block->logical_bytenr = bytenr; | |
2176 | block->is_metadata = is_metadata; | |
2177 | block->never_written = 0; | |
2178 | block->iodone_w_error = 0; | |
2179 | block->mirror_num = 0; /* unknown */ | |
2180 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2181 | block->submit_bio_bh_rw = submit_bio_bh_rw; | |
2182 | if (NULL != bio) { | |
2183 | block->is_iodone = 0; | |
2184 | BUG_ON(NULL == bio_is_patched); | |
2185 | if (!*bio_is_patched) { | |
2186 | block->orig_bio_bh_private = bio->bi_private; | |
2187 | block->orig_bio_bh_end_io.bio = bio->bi_end_io; | |
2188 | block->next_in_same_bio = NULL; | |
2189 | bio->bi_private = block; | |
2190 | bio->bi_end_io = btrfsic_bio_end_io; | |
2191 | *bio_is_patched = 1; | |
2192 | } else { | |
2193 | struct btrfsic_block *chained_block = | |
2194 | (struct btrfsic_block *) | |
2195 | bio->bi_private; | |
2196 | ||
2197 | BUG_ON(NULL == chained_block); | |
2198 | block->orig_bio_bh_private = | |
2199 | chained_block->orig_bio_bh_private; | |
2200 | block->orig_bio_bh_end_io.bio = | |
2201 | chained_block->orig_bio_bh_end_io.bio; | |
2202 | block->next_in_same_bio = chained_block; | |
2203 | bio->bi_private = block; | |
2204 | } | |
2205 | } else if (NULL != bh) { | |
2206 | block->is_iodone = 0; | |
2207 | block->orig_bio_bh_private = bh->b_private; | |
2208 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2209 | block->next_in_same_bio = NULL; | |
2210 | bh->b_private = block; | |
2211 | bh->b_end_io = btrfsic_bh_end_io; | |
2212 | } else { | |
2213 | block->is_iodone = 1; | |
2214 | block->orig_bio_bh_private = NULL; | |
2215 | block->orig_bio_bh_end_io.bio = NULL; | |
2216 | block->next_in_same_bio = NULL; | |
2217 | } | |
2218 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2219 | printk(KERN_INFO | |
2220 | "New written %c-block @%llu (%s/%llu/%d)\n", | |
2221 | is_metadata ? 'M' : 'D', | |
c1c9ff7c GU |
2222 | block->logical_bytenr, block->dev_state->name, |
2223 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2224 | list_add(&block->all_blocks_node, &state->all_blocks_list); |
2225 | btrfsic_block_hashtable_add(block, &state->block_hashtable); | |
2226 | ||
2227 | if (is_metadata) { | |
2228 | ret = btrfsic_process_metablock(state, block, | |
e06baab4 | 2229 | &block_ctx, 0, 0); |
5db02760 SB |
2230 | if (ret) |
2231 | printk(KERN_INFO | |
2232 | "btrfsic: process_metablock(root @%llu)" | |
2233 | " failed!\n", | |
c1c9ff7c | 2234 | dev_bytenr); |
5db02760 SB |
2235 | } |
2236 | btrfsic_release_block_ctx(&block_ctx); | |
2237 | } | |
e06baab4 SB |
2238 | |
2239 | continue_loop: | |
2240 | BUG_ON(!processed_len); | |
2241 | dev_bytenr += processed_len; | |
2242 | mapped_datav += processed_len >> PAGE_CACHE_SHIFT; | |
2243 | num_pages -= processed_len >> PAGE_CACHE_SHIFT; | |
2244 | goto again; | |
5db02760 SB |
2245 | } |
2246 | ||
2247 | static void btrfsic_bio_end_io(struct bio *bp, int bio_error_status) | |
2248 | { | |
2249 | struct btrfsic_block *block = (struct btrfsic_block *)bp->bi_private; | |
2250 | int iodone_w_error; | |
2251 | ||
2252 | /* mutex is not held! This is not save if IO is not yet completed | |
2253 | * on umount */ | |
2254 | iodone_w_error = 0; | |
2255 | if (bio_error_status) | |
2256 | iodone_w_error = 1; | |
2257 | ||
2258 | BUG_ON(NULL == block); | |
2259 | bp->bi_private = block->orig_bio_bh_private; | |
2260 | bp->bi_end_io = block->orig_bio_bh_end_io.bio; | |
2261 | ||
2262 | do { | |
2263 | struct btrfsic_block *next_block; | |
2264 | struct btrfsic_dev_state *const dev_state = block->dev_state; | |
2265 | ||
2266 | if ((dev_state->state->print_mask & | |
2267 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2268 | printk(KERN_INFO | |
2269 | "bio_end_io(err=%d) for %c @%llu (%s/%llu/%d)\n", | |
2270 | bio_error_status, | |
2271 | btrfsic_get_block_type(dev_state->state, block), | |
c1c9ff7c GU |
2272 | block->logical_bytenr, dev_state->name, |
2273 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2274 | next_block = block->next_in_same_bio; |
2275 | block->iodone_w_error = iodone_w_error; | |
2276 | if (block->submit_bio_bh_rw & REQ_FLUSH) { | |
2277 | dev_state->last_flush_gen++; | |
2278 | if ((dev_state->state->print_mask & | |
2279 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2280 | printk(KERN_INFO | |
2281 | "bio_end_io() new %s flush_gen=%llu\n", | |
2282 | dev_state->name, | |
5db02760 SB |
2283 | dev_state->last_flush_gen); |
2284 | } | |
2285 | if (block->submit_bio_bh_rw & REQ_FUA) | |
2286 | block->flush_gen = 0; /* FUA completed means block is | |
2287 | * on disk */ | |
2288 | block->is_iodone = 1; /* for FLUSH, this releases the block */ | |
2289 | block = next_block; | |
2290 | } while (NULL != block); | |
2291 | ||
2292 | bp->bi_end_io(bp, bio_error_status); | |
2293 | } | |
2294 | ||
2295 | static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate) | |
2296 | { | |
2297 | struct btrfsic_block *block = (struct btrfsic_block *)bh->b_private; | |
2298 | int iodone_w_error = !uptodate; | |
2299 | struct btrfsic_dev_state *dev_state; | |
2300 | ||
2301 | BUG_ON(NULL == block); | |
2302 | dev_state = block->dev_state; | |
2303 | if ((dev_state->state->print_mask & BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2304 | printk(KERN_INFO | |
2305 | "bh_end_io(error=%d) for %c @%llu (%s/%llu/%d)\n", | |
2306 | iodone_w_error, | |
2307 | btrfsic_get_block_type(dev_state->state, block), | |
c1c9ff7c GU |
2308 | block->logical_bytenr, block->dev_state->name, |
2309 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2310 | |
2311 | block->iodone_w_error = iodone_w_error; | |
2312 | if (block->submit_bio_bh_rw & REQ_FLUSH) { | |
2313 | dev_state->last_flush_gen++; | |
2314 | if ((dev_state->state->print_mask & | |
2315 | BTRFSIC_PRINT_MASK_END_IO_BIO_BH)) | |
2316 | printk(KERN_INFO | |
2317 | "bh_end_io() new %s flush_gen=%llu\n", | |
c1c9ff7c | 2318 | dev_state->name, dev_state->last_flush_gen); |
5db02760 SB |
2319 | } |
2320 | if (block->submit_bio_bh_rw & REQ_FUA) | |
2321 | block->flush_gen = 0; /* FUA completed means block is on disk */ | |
2322 | ||
2323 | bh->b_private = block->orig_bio_bh_private; | |
2324 | bh->b_end_io = block->orig_bio_bh_end_io.bh; | |
2325 | block->is_iodone = 1; /* for FLUSH, this releases the block */ | |
2326 | bh->b_end_io(bh, uptodate); | |
2327 | } | |
2328 | ||
2329 | static int btrfsic_process_written_superblock( | |
2330 | struct btrfsic_state *state, | |
2331 | struct btrfsic_block *const superblock, | |
2332 | struct btrfs_super_block *const super_hdr) | |
2333 | { | |
2334 | int pass; | |
2335 | ||
2336 | superblock->generation = btrfs_super_generation(super_hdr); | |
2337 | if (!(superblock->generation > state->max_superblock_generation || | |
2338 | 0 == state->max_superblock_generation)) { | |
2339 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
2340 | printk(KERN_INFO | |
2341 | "btrfsic: superblock @%llu (%s/%llu/%d)" | |
2342 | " with old gen %llu <= %llu\n", | |
c1c9ff7c | 2343 | superblock->logical_bytenr, |
5db02760 | 2344 | superblock->dev_state->name, |
c1c9ff7c | 2345 | superblock->dev_bytenr, superblock->mirror_num, |
5db02760 | 2346 | btrfs_super_generation(super_hdr), |
5db02760 SB |
2347 | state->max_superblock_generation); |
2348 | } else { | |
2349 | if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE) | |
2350 | printk(KERN_INFO | |
2351 | "btrfsic: got new superblock @%llu (%s/%llu/%d)" | |
2352 | " with new gen %llu > %llu\n", | |
c1c9ff7c | 2353 | superblock->logical_bytenr, |
5db02760 | 2354 | superblock->dev_state->name, |
c1c9ff7c | 2355 | superblock->dev_bytenr, superblock->mirror_num, |
5db02760 | 2356 | btrfs_super_generation(super_hdr), |
5db02760 SB |
2357 | state->max_superblock_generation); |
2358 | ||
2359 | state->max_superblock_generation = | |
2360 | btrfs_super_generation(super_hdr); | |
2361 | state->latest_superblock = superblock; | |
2362 | } | |
2363 | ||
2364 | for (pass = 0; pass < 3; pass++) { | |
2365 | int ret; | |
2366 | u64 next_bytenr; | |
2367 | struct btrfsic_block *next_block; | |
2368 | struct btrfsic_block_data_ctx tmp_next_block_ctx; | |
2369 | struct btrfsic_block_link *l; | |
2370 | int num_copies; | |
2371 | int mirror_num; | |
2372 | const char *additional_string = NULL; | |
35a3621b | 2373 | struct btrfs_disk_key tmp_disk_key = {0}; |
5db02760 | 2374 | |
3cae210f QW |
2375 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2376 | BTRFS_ROOT_ITEM_KEY); | |
2377 | btrfs_set_disk_key_objectid(&tmp_disk_key, 0); | |
5db02760 SB |
2378 | |
2379 | switch (pass) { | |
2380 | case 0: | |
3cae210f QW |
2381 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2382 | BTRFS_ROOT_TREE_OBJECTID); | |
5db02760 SB |
2383 | additional_string = "root "; |
2384 | next_bytenr = btrfs_super_root(super_hdr); | |
2385 | if (state->print_mask & | |
2386 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2387 | printk(KERN_INFO "root@%llu\n", next_bytenr); |
5db02760 SB |
2388 | break; |
2389 | case 1: | |
3cae210f QW |
2390 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2391 | BTRFS_CHUNK_TREE_OBJECTID); | |
5db02760 SB |
2392 | additional_string = "chunk "; |
2393 | next_bytenr = btrfs_super_chunk_root(super_hdr); | |
2394 | if (state->print_mask & | |
2395 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2396 | printk(KERN_INFO "chunk@%llu\n", next_bytenr); |
5db02760 SB |
2397 | break; |
2398 | case 2: | |
3cae210f QW |
2399 | btrfs_set_disk_key_objectid(&tmp_disk_key, |
2400 | BTRFS_TREE_LOG_OBJECTID); | |
5db02760 SB |
2401 | additional_string = "log "; |
2402 | next_bytenr = btrfs_super_log_root(super_hdr); | |
2403 | if (0 == next_bytenr) | |
2404 | continue; | |
2405 | if (state->print_mask & | |
2406 | BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION) | |
c1c9ff7c | 2407 | printk(KERN_INFO "log@%llu\n", next_bytenr); |
5db02760 SB |
2408 | break; |
2409 | } | |
2410 | ||
2411 | num_copies = | |
5d964051 | 2412 | btrfs_num_copies(state->root->fs_info, |
e06baab4 | 2413 | next_bytenr, BTRFS_SUPER_INFO_SIZE); |
5db02760 SB |
2414 | if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES) |
2415 | printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n", | |
c1c9ff7c | 2416 | next_bytenr, num_copies); |
5db02760 SB |
2417 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
2418 | int was_created; | |
2419 | ||
2420 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2421 | printk(KERN_INFO | |
2422 | "btrfsic_process_written_superblock(" | |
2423 | "mirror_num=%d)\n", mirror_num); | |
e06baab4 SB |
2424 | ret = btrfsic_map_block(state, next_bytenr, |
2425 | BTRFS_SUPER_INFO_SIZE, | |
5db02760 SB |
2426 | &tmp_next_block_ctx, |
2427 | mirror_num); | |
2428 | if (ret) { | |
2429 | printk(KERN_INFO | |
2430 | "btrfsic: btrfsic_map_block(@%llu," | |
2431 | " mirror=%d) failed!\n", | |
c1c9ff7c | 2432 | next_bytenr, mirror_num); |
5db02760 SB |
2433 | return -1; |
2434 | } | |
2435 | ||
2436 | next_block = btrfsic_block_lookup_or_add( | |
2437 | state, | |
2438 | &tmp_next_block_ctx, | |
2439 | additional_string, | |
2440 | 1, 0, 1, | |
2441 | mirror_num, | |
2442 | &was_created); | |
2443 | if (NULL == next_block) { | |
2444 | printk(KERN_INFO | |
2445 | "btrfsic: error, kmalloc failed!\n"); | |
2446 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
2447 | return -1; | |
2448 | } | |
2449 | ||
2450 | next_block->disk_key = tmp_disk_key; | |
2451 | if (was_created) | |
2452 | next_block->generation = | |
2453 | BTRFSIC_GENERATION_UNKNOWN; | |
2454 | l = btrfsic_block_link_lookup_or_add( | |
2455 | state, | |
2456 | &tmp_next_block_ctx, | |
2457 | next_block, | |
2458 | superblock, | |
2459 | BTRFSIC_GENERATION_UNKNOWN); | |
2460 | btrfsic_release_block_ctx(&tmp_next_block_ctx); | |
2461 | if (NULL == l) | |
2462 | return -1; | |
2463 | } | |
2464 | } | |
2465 | ||
2466 | if (-1 == btrfsic_check_all_ref_blocks(state, superblock, 0)) { | |
2467 | WARN_ON(1); | |
2468 | btrfsic_dump_tree(state); | |
2469 | } | |
2470 | ||
2471 | return 0; | |
2472 | } | |
2473 | ||
2474 | static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state, | |
2475 | struct btrfsic_block *const block, | |
2476 | int recursion_level) | |
2477 | { | |
2478 | struct list_head *elem_ref_to; | |
2479 | int ret = 0; | |
2480 | ||
2481 | if (recursion_level >= 3 + BTRFS_MAX_LEVEL) { | |
2482 | /* | |
2483 | * Note that this situation can happen and does not | |
2484 | * indicate an error in regular cases. It happens | |
2485 | * when disk blocks are freed and later reused. | |
2486 | * The check-integrity module is not aware of any | |
2487 | * block free operations, it just recognizes block | |
2488 | * write operations. Therefore it keeps the linkage | |
2489 | * information for a block until a block is | |
2490 | * rewritten. This can temporarily cause incorrect | |
2491 | * and even circular linkage informations. This | |
2492 | * causes no harm unless such blocks are referenced | |
2493 | * by the most recent super block. | |
2494 | */ | |
2495 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2496 | printk(KERN_INFO | |
2497 | "btrfsic: abort cyclic linkage (case 1).\n"); | |
2498 | ||
2499 | return ret; | |
2500 | } | |
2501 | ||
2502 | /* | |
2503 | * This algorithm is recursive because the amount of used stack | |
2504 | * space is very small and the max recursion depth is limited. | |
2505 | */ | |
2506 | list_for_each(elem_ref_to, &block->ref_to_list) { | |
2507 | const struct btrfsic_block_link *const l = | |
2508 | list_entry(elem_ref_to, struct btrfsic_block_link, | |
2509 | node_ref_to); | |
2510 | ||
2511 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2512 | printk(KERN_INFO | |
2513 | "rl=%d, %c @%llu (%s/%llu/%d)" | |
2514 | " %u* refers to %c @%llu (%s/%llu/%d)\n", | |
2515 | recursion_level, | |
2516 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2517 | block->logical_bytenr, block->dev_state->name, |
2518 | block->dev_bytenr, block->mirror_num, | |
5db02760 SB |
2519 | l->ref_cnt, |
2520 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2521 | l->block_ref_to->logical_bytenr, |
2522 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2523 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2524 | l->block_ref_to->mirror_num); |
2525 | if (l->block_ref_to->never_written) { | |
2526 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2527 | " which references block %c @%llu (%s/%llu/%d)" | |
2528 | " which is never written!\n", | |
2529 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2530 | l->block_ref_to->logical_bytenr, |
2531 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2532 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2533 | l->block_ref_to->mirror_num); |
2534 | ret = -1; | |
2535 | } else if (!l->block_ref_to->is_iodone) { | |
2536 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2537 | " which references block %c @%llu (%s/%llu/%d)" | |
2538 | " which is not yet iodone!\n", | |
2539 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2540 | l->block_ref_to->logical_bytenr, |
2541 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2542 | l->block_ref_to->dev_bytenr, |
5db02760 SB |
2543 | l->block_ref_to->mirror_num); |
2544 | ret = -1; | |
62856a9b SB |
2545 | } else if (l->block_ref_to->iodone_w_error) { |
2546 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2547 | " which references block %c @%llu (%s/%llu/%d)" | |
2548 | " which has write error!\n", | |
2549 | btrfsic_get_block_type(state, l->block_ref_to), | |
62856a9b SB |
2550 | l->block_ref_to->logical_bytenr, |
2551 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2552 | l->block_ref_to->dev_bytenr, |
62856a9b SB |
2553 | l->block_ref_to->mirror_num); |
2554 | ret = -1; | |
5db02760 SB |
2555 | } else if (l->parent_generation != |
2556 | l->block_ref_to->generation && | |
2557 | BTRFSIC_GENERATION_UNKNOWN != | |
2558 | l->parent_generation && | |
2559 | BTRFSIC_GENERATION_UNKNOWN != | |
2560 | l->block_ref_to->generation) { | |
2561 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2562 | " which references block %c @%llu (%s/%llu/%d)" | |
2563 | " with generation %llu !=" | |
2564 | " parent generation %llu!\n", | |
2565 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2566 | l->block_ref_to->logical_bytenr, |
2567 | l->block_ref_to->dev_state->name, | |
c1c9ff7c | 2568 | l->block_ref_to->dev_bytenr, |
5db02760 | 2569 | l->block_ref_to->mirror_num, |
c1c9ff7c GU |
2570 | l->block_ref_to->generation, |
2571 | l->parent_generation); | |
5db02760 SB |
2572 | ret = -1; |
2573 | } else if (l->block_ref_to->flush_gen > | |
2574 | l->block_ref_to->dev_state->last_flush_gen) { | |
2575 | printk(KERN_INFO "btrfs: attempt to write superblock" | |
2576 | " which references block %c @%llu (%s/%llu/%d)" | |
2577 | " which is not flushed out of disk's write cache" | |
2578 | " (block flush_gen=%llu," | |
2579 | " dev->flush_gen=%llu)!\n", | |
2580 | btrfsic_get_block_type(state, l->block_ref_to), | |
5db02760 SB |
2581 | l->block_ref_to->logical_bytenr, |
2582 | l->block_ref_to->dev_state->name, | |
c1c9ff7c GU |
2583 | l->block_ref_to->dev_bytenr, |
2584 | l->block_ref_to->mirror_num, block->flush_gen, | |
5db02760 SB |
2585 | l->block_ref_to->dev_state->last_flush_gen); |
2586 | ret = -1; | |
2587 | } else if (-1 == btrfsic_check_all_ref_blocks(state, | |
2588 | l->block_ref_to, | |
2589 | recursion_level + | |
2590 | 1)) { | |
2591 | ret = -1; | |
2592 | } | |
2593 | } | |
2594 | ||
2595 | return ret; | |
2596 | } | |
2597 | ||
2598 | static int btrfsic_is_block_ref_by_superblock( | |
2599 | const struct btrfsic_state *state, | |
2600 | const struct btrfsic_block *block, | |
2601 | int recursion_level) | |
2602 | { | |
2603 | struct list_head *elem_ref_from; | |
2604 | ||
2605 | if (recursion_level >= 3 + BTRFS_MAX_LEVEL) { | |
2606 | /* refer to comment at "abort cyclic linkage (case 1)" */ | |
2607 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2608 | printk(KERN_INFO | |
2609 | "btrfsic: abort cyclic linkage (case 2).\n"); | |
2610 | ||
2611 | return 0; | |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * This algorithm is recursive because the amount of used stack space | |
2616 | * is very small and the max recursion depth is limited. | |
2617 | */ | |
2618 | list_for_each(elem_ref_from, &block->ref_from_list) { | |
2619 | const struct btrfsic_block_link *const l = | |
2620 | list_entry(elem_ref_from, struct btrfsic_block_link, | |
2621 | node_ref_from); | |
2622 | ||
2623 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2624 | printk(KERN_INFO | |
2625 | "rl=%d, %c @%llu (%s/%llu/%d)" | |
2626 | " is ref %u* from %c @%llu (%s/%llu/%d)\n", | |
2627 | recursion_level, | |
2628 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2629 | block->logical_bytenr, block->dev_state->name, |
2630 | block->dev_bytenr, block->mirror_num, | |
5db02760 SB |
2631 | l->ref_cnt, |
2632 | btrfsic_get_block_type(state, l->block_ref_from), | |
5db02760 SB |
2633 | l->block_ref_from->logical_bytenr, |
2634 | l->block_ref_from->dev_state->name, | |
5db02760 SB |
2635 | l->block_ref_from->dev_bytenr, |
2636 | l->block_ref_from->mirror_num); | |
2637 | if (l->block_ref_from->is_superblock && | |
2638 | state->latest_superblock->dev_bytenr == | |
2639 | l->block_ref_from->dev_bytenr && | |
2640 | state->latest_superblock->dev_state->bdev == | |
2641 | l->block_ref_from->dev_state->bdev) | |
2642 | return 1; | |
2643 | else if (btrfsic_is_block_ref_by_superblock(state, | |
2644 | l->block_ref_from, | |
2645 | recursion_level + | |
2646 | 1)) | |
2647 | return 1; | |
2648 | } | |
2649 | ||
2650 | return 0; | |
2651 | } | |
2652 | ||
2653 | static void btrfsic_print_add_link(const struct btrfsic_state *state, | |
2654 | const struct btrfsic_block_link *l) | |
2655 | { | |
2656 | printk(KERN_INFO | |
2657 | "Add %u* link from %c @%llu (%s/%llu/%d)" | |
2658 | " to %c @%llu (%s/%llu/%d).\n", | |
2659 | l->ref_cnt, | |
2660 | btrfsic_get_block_type(state, l->block_ref_from), | |
c1c9ff7c | 2661 | l->block_ref_from->logical_bytenr, |
5db02760 | 2662 | l->block_ref_from->dev_state->name, |
c1c9ff7c | 2663 | l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num, |
5db02760 | 2664 | btrfsic_get_block_type(state, l->block_ref_to), |
c1c9ff7c GU |
2665 | l->block_ref_to->logical_bytenr, |
2666 | l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr, | |
5db02760 SB |
2667 | l->block_ref_to->mirror_num); |
2668 | } | |
2669 | ||
2670 | static void btrfsic_print_rem_link(const struct btrfsic_state *state, | |
2671 | const struct btrfsic_block_link *l) | |
2672 | { | |
2673 | printk(KERN_INFO | |
2674 | "Rem %u* link from %c @%llu (%s/%llu/%d)" | |
2675 | " to %c @%llu (%s/%llu/%d).\n", | |
2676 | l->ref_cnt, | |
2677 | btrfsic_get_block_type(state, l->block_ref_from), | |
c1c9ff7c | 2678 | l->block_ref_from->logical_bytenr, |
5db02760 | 2679 | l->block_ref_from->dev_state->name, |
c1c9ff7c | 2680 | l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num, |
5db02760 | 2681 | btrfsic_get_block_type(state, l->block_ref_to), |
c1c9ff7c GU |
2682 | l->block_ref_to->logical_bytenr, |
2683 | l->block_ref_to->dev_state->name, l->block_ref_to->dev_bytenr, | |
5db02760 SB |
2684 | l->block_ref_to->mirror_num); |
2685 | } | |
2686 | ||
2687 | static char btrfsic_get_block_type(const struct btrfsic_state *state, | |
2688 | const struct btrfsic_block *block) | |
2689 | { | |
2690 | if (block->is_superblock && | |
2691 | state->latest_superblock->dev_bytenr == block->dev_bytenr && | |
2692 | state->latest_superblock->dev_state->bdev == block->dev_state->bdev) | |
2693 | return 'S'; | |
2694 | else if (block->is_superblock) | |
2695 | return 's'; | |
2696 | else if (block->is_metadata) | |
2697 | return 'M'; | |
2698 | else | |
2699 | return 'D'; | |
2700 | } | |
2701 | ||
2702 | static void btrfsic_dump_tree(const struct btrfsic_state *state) | |
2703 | { | |
2704 | btrfsic_dump_tree_sub(state, state->latest_superblock, 0); | |
2705 | } | |
2706 | ||
2707 | static void btrfsic_dump_tree_sub(const struct btrfsic_state *state, | |
2708 | const struct btrfsic_block *block, | |
2709 | int indent_level) | |
2710 | { | |
2711 | struct list_head *elem_ref_to; | |
2712 | int indent_add; | |
2713 | static char buf[80]; | |
2714 | int cursor_position; | |
2715 | ||
2716 | /* | |
2717 | * Should better fill an on-stack buffer with a complete line and | |
2718 | * dump it at once when it is time to print a newline character. | |
2719 | */ | |
2720 | ||
2721 | /* | |
2722 | * This algorithm is recursive because the amount of used stack space | |
2723 | * is very small and the max recursion depth is limited. | |
2724 | */ | |
2725 | indent_add = sprintf(buf, "%c-%llu(%s/%llu/%d)", | |
2726 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2727 | block->logical_bytenr, block->dev_state->name, |
2728 | block->dev_bytenr, block->mirror_num); | |
5db02760 SB |
2729 | if (indent_level + indent_add > BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) { |
2730 | printk("[...]\n"); | |
2731 | return; | |
2732 | } | |
2733 | printk(buf); | |
2734 | indent_level += indent_add; | |
2735 | if (list_empty(&block->ref_to_list)) { | |
2736 | printk("\n"); | |
2737 | return; | |
2738 | } | |
2739 | if (block->mirror_num > 1 && | |
2740 | !(state->print_mask & BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS)) { | |
2741 | printk(" [...]\n"); | |
2742 | return; | |
2743 | } | |
2744 | ||
2745 | cursor_position = indent_level; | |
2746 | list_for_each(elem_ref_to, &block->ref_to_list) { | |
2747 | const struct btrfsic_block_link *const l = | |
2748 | list_entry(elem_ref_to, struct btrfsic_block_link, | |
2749 | node_ref_to); | |
2750 | ||
2751 | while (cursor_position < indent_level) { | |
2752 | printk(" "); | |
2753 | cursor_position++; | |
2754 | } | |
2755 | if (l->ref_cnt > 1) | |
2756 | indent_add = sprintf(buf, " %d*--> ", l->ref_cnt); | |
2757 | else | |
2758 | indent_add = sprintf(buf, " --> "); | |
2759 | if (indent_level + indent_add > | |
2760 | BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) { | |
2761 | printk("[...]\n"); | |
2762 | cursor_position = 0; | |
2763 | continue; | |
2764 | } | |
2765 | ||
2766 | printk(buf); | |
2767 | ||
2768 | btrfsic_dump_tree_sub(state, l->block_ref_to, | |
2769 | indent_level + indent_add); | |
2770 | cursor_position = 0; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add( | |
2775 | struct btrfsic_state *state, | |
2776 | struct btrfsic_block_data_ctx *next_block_ctx, | |
2777 | struct btrfsic_block *next_block, | |
2778 | struct btrfsic_block *from_block, | |
2779 | u64 parent_generation) | |
2780 | { | |
2781 | struct btrfsic_block_link *l; | |
2782 | ||
2783 | l = btrfsic_block_link_hashtable_lookup(next_block_ctx->dev->bdev, | |
2784 | next_block_ctx->dev_bytenr, | |
2785 | from_block->dev_state->bdev, | |
2786 | from_block->dev_bytenr, | |
2787 | &state->block_link_hashtable); | |
2788 | if (NULL == l) { | |
2789 | l = btrfsic_block_link_alloc(); | |
2790 | if (NULL == l) { | |
2791 | printk(KERN_INFO | |
2792 | "btrfsic: error, kmalloc" " failed!\n"); | |
2793 | return NULL; | |
2794 | } | |
2795 | ||
2796 | l->block_ref_to = next_block; | |
2797 | l->block_ref_from = from_block; | |
2798 | l->ref_cnt = 1; | |
2799 | l->parent_generation = parent_generation; | |
2800 | ||
2801 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2802 | btrfsic_print_add_link(state, l); | |
2803 | ||
2804 | list_add(&l->node_ref_to, &from_block->ref_to_list); | |
2805 | list_add(&l->node_ref_from, &next_block->ref_from_list); | |
2806 | ||
2807 | btrfsic_block_link_hashtable_add(l, | |
2808 | &state->block_link_hashtable); | |
2809 | } else { | |
2810 | l->ref_cnt++; | |
2811 | l->parent_generation = parent_generation; | |
2812 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2813 | btrfsic_print_add_link(state, l); | |
2814 | } | |
2815 | ||
2816 | return l; | |
2817 | } | |
2818 | ||
2819 | static struct btrfsic_block *btrfsic_block_lookup_or_add( | |
2820 | struct btrfsic_state *state, | |
2821 | struct btrfsic_block_data_ctx *block_ctx, | |
2822 | const char *additional_string, | |
2823 | int is_metadata, | |
2824 | int is_iodone, | |
2825 | int never_written, | |
2826 | int mirror_num, | |
2827 | int *was_created) | |
2828 | { | |
2829 | struct btrfsic_block *block; | |
2830 | ||
2831 | block = btrfsic_block_hashtable_lookup(block_ctx->dev->bdev, | |
2832 | block_ctx->dev_bytenr, | |
2833 | &state->block_hashtable); | |
2834 | if (NULL == block) { | |
2835 | struct btrfsic_dev_state *dev_state; | |
2836 | ||
2837 | block = btrfsic_block_alloc(); | |
2838 | if (NULL == block) { | |
2839 | printk(KERN_INFO "btrfsic: error, kmalloc failed!\n"); | |
2840 | return NULL; | |
2841 | } | |
2842 | dev_state = btrfsic_dev_state_lookup(block_ctx->dev->bdev); | |
2843 | if (NULL == dev_state) { | |
2844 | printk(KERN_INFO | |
2845 | "btrfsic: error, lookup dev_state failed!\n"); | |
2846 | btrfsic_block_free(block); | |
2847 | return NULL; | |
2848 | } | |
2849 | block->dev_state = dev_state; | |
2850 | block->dev_bytenr = block_ctx->dev_bytenr; | |
2851 | block->logical_bytenr = block_ctx->start; | |
2852 | block->is_metadata = is_metadata; | |
2853 | block->is_iodone = is_iodone; | |
2854 | block->never_written = never_written; | |
2855 | block->mirror_num = mirror_num; | |
2856 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
2857 | printk(KERN_INFO | |
2858 | "New %s%c-block @%llu (%s/%llu/%d)\n", | |
2859 | additional_string, | |
2860 | btrfsic_get_block_type(state, block), | |
c1c9ff7c GU |
2861 | block->logical_bytenr, dev_state->name, |
2862 | block->dev_bytenr, mirror_num); | |
5db02760 SB |
2863 | list_add(&block->all_blocks_node, &state->all_blocks_list); |
2864 | btrfsic_block_hashtable_add(block, &state->block_hashtable); | |
2865 | if (NULL != was_created) | |
2866 | *was_created = 1; | |
2867 | } else { | |
2868 | if (NULL != was_created) | |
2869 | *was_created = 0; | |
2870 | } | |
2871 | ||
2872 | return block; | |
2873 | } | |
2874 | ||
2875 | static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state, | |
2876 | u64 bytenr, | |
2877 | struct btrfsic_dev_state *dev_state, | |
e06baab4 | 2878 | u64 dev_bytenr) |
5db02760 SB |
2879 | { |
2880 | int num_copies; | |
2881 | int mirror_num; | |
2882 | int ret; | |
2883 | struct btrfsic_block_data_ctx block_ctx; | |
2884 | int match = 0; | |
2885 | ||
5d964051 | 2886 | num_copies = btrfs_num_copies(state->root->fs_info, |
e06baab4 | 2887 | bytenr, state->metablock_size); |
5db02760 SB |
2888 | |
2889 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { | |
e06baab4 | 2890 | ret = btrfsic_map_block(state, bytenr, state->metablock_size, |
5db02760 SB |
2891 | &block_ctx, mirror_num); |
2892 | if (ret) { | |
2893 | printk(KERN_INFO "btrfsic:" | |
2894 | " btrfsic_map_block(logical @%llu," | |
2895 | " mirror %d) failed!\n", | |
c1c9ff7c | 2896 | bytenr, mirror_num); |
5db02760 SB |
2897 | continue; |
2898 | } | |
2899 | ||
2900 | if (dev_state->bdev == block_ctx.dev->bdev && | |
2901 | dev_bytenr == block_ctx.dev_bytenr) { | |
2902 | match++; | |
2903 | btrfsic_release_block_ctx(&block_ctx); | |
2904 | break; | |
2905 | } | |
2906 | btrfsic_release_block_ctx(&block_ctx); | |
2907 | } | |
2908 | ||
2909 | if (!match) { | |
2910 | printk(KERN_INFO "btrfs: attempt to write M-block which contains logical bytenr that doesn't map to dev+physical bytenr of submit_bio," | |
2911 | " buffer->log_bytenr=%llu, submit_bio(bdev=%s," | |
2912 | " phys_bytenr=%llu)!\n", | |
c1c9ff7c | 2913 | bytenr, dev_state->name, dev_bytenr); |
5db02760 | 2914 | for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { |
e06baab4 SB |
2915 | ret = btrfsic_map_block(state, bytenr, |
2916 | state->metablock_size, | |
5db02760 SB |
2917 | &block_ctx, mirror_num); |
2918 | if (ret) | |
2919 | continue; | |
2920 | ||
2921 | printk(KERN_INFO "Read logical bytenr @%llu maps to" | |
2922 | " (%s/%llu/%d)\n", | |
c1c9ff7c GU |
2923 | bytenr, block_ctx.dev->name, |
2924 | block_ctx.dev_bytenr, mirror_num); | |
5db02760 SB |
2925 | } |
2926 | WARN_ON(1); | |
2927 | } | |
2928 | } | |
2929 | ||
2930 | static struct btrfsic_dev_state *btrfsic_dev_state_lookup( | |
2931 | struct block_device *bdev) | |
2932 | { | |
2933 | struct btrfsic_dev_state *ds; | |
2934 | ||
2935 | ds = btrfsic_dev_state_hashtable_lookup(bdev, | |
2936 | &btrfsic_dev_state_hashtable); | |
2937 | return ds; | |
2938 | } | |
2939 | ||
2940 | int btrfsic_submit_bh(int rw, struct buffer_head *bh) | |
2941 | { | |
2942 | struct btrfsic_dev_state *dev_state; | |
2943 | ||
2944 | if (!btrfsic_is_initialized) | |
2945 | return submit_bh(rw, bh); | |
2946 | ||
2947 | mutex_lock(&btrfsic_mutex); | |
2948 | /* since btrfsic_submit_bh() might also be called before | |
2949 | * btrfsic_mount(), this might return NULL */ | |
2950 | dev_state = btrfsic_dev_state_lookup(bh->b_bdev); | |
2951 | ||
2952 | /* Only called to write the superblock (incl. FLUSH/FUA) */ | |
2953 | if (NULL != dev_state && | |
2954 | (rw & WRITE) && bh->b_size > 0) { | |
2955 | u64 dev_bytenr; | |
2956 | ||
2957 | dev_bytenr = 4096 * bh->b_blocknr; | |
2958 | if (dev_state->state->print_mask & | |
2959 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
2960 | printk(KERN_INFO | |
fce29364 | 2961 | "submit_bh(rw=0x%x, blocknr=%llu (bytenr %llu)," |
8d78eb16 | 2962 | " size=%zu, data=%p, bdev=%p)\n", |
fce29364 | 2963 | rw, (unsigned long long)bh->b_blocknr, |
8d78eb16 | 2964 | dev_bytenr, bh->b_size, bh->b_data, bh->b_bdev); |
5db02760 | 2965 | btrfsic_process_written_block(dev_state, dev_bytenr, |
e06baab4 | 2966 | &bh->b_data, 1, NULL, |
5db02760 SB |
2967 | NULL, bh, rw); |
2968 | } else if (NULL != dev_state && (rw & REQ_FLUSH)) { | |
2969 | if (dev_state->state->print_mask & | |
2970 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
2971 | printk(KERN_INFO | |
e06baab4 | 2972 | "submit_bh(rw=0x%x FLUSH, bdev=%p)\n", |
5db02760 SB |
2973 | rw, bh->b_bdev); |
2974 | if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) { | |
2975 | if ((dev_state->state->print_mask & | |
2976 | (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | | |
2977 | BTRFSIC_PRINT_MASK_VERBOSE))) | |
2978 | printk(KERN_INFO | |
2979 | "btrfsic_submit_bh(%s) with FLUSH" | |
2980 | " but dummy block already in use" | |
2981 | " (ignored)!\n", | |
2982 | dev_state->name); | |
2983 | } else { | |
2984 | struct btrfsic_block *const block = | |
2985 | &dev_state->dummy_block_for_bio_bh_flush; | |
2986 | ||
2987 | block->is_iodone = 0; | |
2988 | block->never_written = 0; | |
2989 | block->iodone_w_error = 0; | |
2990 | block->flush_gen = dev_state->last_flush_gen + 1; | |
2991 | block->submit_bio_bh_rw = rw; | |
2992 | block->orig_bio_bh_private = bh->b_private; | |
2993 | block->orig_bio_bh_end_io.bh = bh->b_end_io; | |
2994 | block->next_in_same_bio = NULL; | |
2995 | bh->b_private = block; | |
2996 | bh->b_end_io = btrfsic_bh_end_io; | |
2997 | } | |
2998 | } | |
2999 | mutex_unlock(&btrfsic_mutex); | |
3000 | return submit_bh(rw, bh); | |
3001 | } | |
3002 | ||
3003 | void btrfsic_submit_bio(int rw, struct bio *bio) | |
3004 | { | |
3005 | struct btrfsic_dev_state *dev_state; | |
3006 | ||
3007 | if (!btrfsic_is_initialized) { | |
3008 | submit_bio(rw, bio); | |
3009 | return; | |
3010 | } | |
3011 | ||
3012 | mutex_lock(&btrfsic_mutex); | |
3013 | /* since btrfsic_submit_bio() is also called before | |
3014 | * btrfsic_mount(), this might return NULL */ | |
3015 | dev_state = btrfsic_dev_state_lookup(bio->bi_bdev); | |
3016 | if (NULL != dev_state && | |
3017 | (rw & WRITE) && NULL != bio->bi_io_vec) { | |
3018 | unsigned int i; | |
3019 | u64 dev_bytenr; | |
3020 | int bio_is_patched; | |
e06baab4 | 3021 | char **mapped_datav; |
5db02760 SB |
3022 | |
3023 | dev_bytenr = 512 * bio->bi_sector; | |
3024 | bio_is_patched = 0; | |
3025 | if (dev_state->state->print_mask & | |
3026 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
3027 | printk(KERN_INFO | |
3028 | "submit_bio(rw=0x%x, bi_vcnt=%u," | |
fce29364 GU |
3029 | " bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n", |
3030 | rw, bio->bi_vcnt, | |
3031 | (unsigned long long)bio->bi_sector, dev_bytenr, | |
3032 | bio->bi_bdev); | |
5db02760 | 3033 | |
e06baab4 SB |
3034 | mapped_datav = kmalloc(sizeof(*mapped_datav) * bio->bi_vcnt, |
3035 | GFP_NOFS); | |
3036 | if (!mapped_datav) | |
3037 | goto leave; | |
5db02760 | 3038 | for (i = 0; i < bio->bi_vcnt; i++) { |
e06baab4 SB |
3039 | BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_CACHE_SIZE); |
3040 | mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page); | |
3041 | if (!mapped_datav[i]) { | |
3042 | while (i > 0) { | |
3043 | i--; | |
3044 | kunmap(bio->bi_io_vec[i].bv_page); | |
3045 | } | |
3046 | kfree(mapped_datav); | |
3047 | goto leave; | |
3048 | } | |
5db02760 SB |
3049 | if ((BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | |
3050 | BTRFSIC_PRINT_MASK_VERBOSE) == | |
3051 | (dev_state->state->print_mask & | |
3052 | (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | | |
3053 | BTRFSIC_PRINT_MASK_VERBOSE))) | |
3054 | printk(KERN_INFO | |
e06baab4 | 3055 | "#%u: page=%p, len=%u, offset=%u\n", |
5db02760 | 3056 | i, bio->bi_io_vec[i].bv_page, |
5db02760 SB |
3057 | bio->bi_io_vec[i].bv_len, |
3058 | bio->bi_io_vec[i].bv_offset); | |
e06baab4 SB |
3059 | } |
3060 | btrfsic_process_written_block(dev_state, dev_bytenr, | |
3061 | mapped_datav, bio->bi_vcnt, | |
3062 | bio, &bio_is_patched, | |
3063 | NULL, rw); | |
3064 | while (i > 0) { | |
3065 | i--; | |
5db02760 | 3066 | kunmap(bio->bi_io_vec[i].bv_page); |
5db02760 | 3067 | } |
e06baab4 | 3068 | kfree(mapped_datav); |
5db02760 SB |
3069 | } else if (NULL != dev_state && (rw & REQ_FLUSH)) { |
3070 | if (dev_state->state->print_mask & | |
3071 | BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) | |
3072 | printk(KERN_INFO | |
e06baab4 | 3073 | "submit_bio(rw=0x%x FLUSH, bdev=%p)\n", |
5db02760 SB |
3074 | rw, bio->bi_bdev); |
3075 | if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) { | |
3076 | if ((dev_state->state->print_mask & | |
3077 | (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH | | |
3078 | BTRFSIC_PRINT_MASK_VERBOSE))) | |
3079 | printk(KERN_INFO | |
3080 | "btrfsic_submit_bio(%s) with FLUSH" | |
3081 | " but dummy block already in use" | |
3082 | " (ignored)!\n", | |
3083 | dev_state->name); | |
3084 | } else { | |
3085 | struct btrfsic_block *const block = | |
3086 | &dev_state->dummy_block_for_bio_bh_flush; | |
3087 | ||
3088 | block->is_iodone = 0; | |
3089 | block->never_written = 0; | |
3090 | block->iodone_w_error = 0; | |
3091 | block->flush_gen = dev_state->last_flush_gen + 1; | |
3092 | block->submit_bio_bh_rw = rw; | |
3093 | block->orig_bio_bh_private = bio->bi_private; | |
3094 | block->orig_bio_bh_end_io.bio = bio->bi_end_io; | |
3095 | block->next_in_same_bio = NULL; | |
3096 | bio->bi_private = block; | |
3097 | bio->bi_end_io = btrfsic_bio_end_io; | |
3098 | } | |
3099 | } | |
e06baab4 | 3100 | leave: |
5db02760 SB |
3101 | mutex_unlock(&btrfsic_mutex); |
3102 | ||
3103 | submit_bio(rw, bio); | |
3104 | } | |
3105 | ||
3106 | int btrfsic_mount(struct btrfs_root *root, | |
3107 | struct btrfs_fs_devices *fs_devices, | |
3108 | int including_extent_data, u32 print_mask) | |
3109 | { | |
3110 | int ret; | |
3111 | struct btrfsic_state *state; | |
3112 | struct list_head *dev_head = &fs_devices->devices; | |
3113 | struct btrfs_device *device; | |
3114 | ||
e06baab4 SB |
3115 | if (root->nodesize != root->leafsize) { |
3116 | printk(KERN_INFO | |
3117 | "btrfsic: cannot handle nodesize %d != leafsize %d!\n", | |
3118 | root->nodesize, root->leafsize); | |
3119 | return -1; | |
3120 | } | |
3121 | if (root->nodesize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3122 | printk(KERN_INFO | |
3123 | "btrfsic: cannot handle nodesize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3124 | root->nodesize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3125 | return -1; |
3126 | } | |
3127 | if (root->leafsize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3128 | printk(KERN_INFO | |
3129 | "btrfsic: cannot handle leafsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3130 | root->leafsize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3131 | return -1; |
3132 | } | |
3133 | if (root->sectorsize & ((u64)PAGE_CACHE_SIZE - 1)) { | |
3134 | printk(KERN_INFO | |
3135 | "btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n", | |
778746b5 | 3136 | root->sectorsize, PAGE_CACHE_SIZE); |
e06baab4 SB |
3137 | return -1; |
3138 | } | |
5db02760 SB |
3139 | state = kzalloc(sizeof(*state), GFP_NOFS); |
3140 | if (NULL == state) { | |
3141 | printk(KERN_INFO "btrfs check-integrity: kmalloc() failed!\n"); | |
3142 | return -1; | |
3143 | } | |
3144 | ||
3145 | if (!btrfsic_is_initialized) { | |
3146 | mutex_init(&btrfsic_mutex); | |
3147 | btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable); | |
3148 | btrfsic_is_initialized = 1; | |
3149 | } | |
3150 | mutex_lock(&btrfsic_mutex); | |
3151 | state->root = root; | |
3152 | state->print_mask = print_mask; | |
3153 | state->include_extent_data = including_extent_data; | |
3154 | state->csum_size = 0; | |
e06baab4 SB |
3155 | state->metablock_size = root->nodesize; |
3156 | state->datablock_size = root->sectorsize; | |
5db02760 SB |
3157 | INIT_LIST_HEAD(&state->all_blocks_list); |
3158 | btrfsic_block_hashtable_init(&state->block_hashtable); | |
3159 | btrfsic_block_link_hashtable_init(&state->block_link_hashtable); | |
3160 | state->max_superblock_generation = 0; | |
3161 | state->latest_superblock = NULL; | |
3162 | ||
3163 | list_for_each_entry(device, dev_head, dev_list) { | |
3164 | struct btrfsic_dev_state *ds; | |
3165 | char *p; | |
3166 | ||
3167 | if (!device->bdev || !device->name) | |
3168 | continue; | |
3169 | ||
3170 | ds = btrfsic_dev_state_alloc(); | |
3171 | if (NULL == ds) { | |
3172 | printk(KERN_INFO | |
3173 | "btrfs check-integrity: kmalloc() failed!\n"); | |
3174 | mutex_unlock(&btrfsic_mutex); | |
3175 | return -1; | |
3176 | } | |
3177 | ds->bdev = device->bdev; | |
3178 | ds->state = state; | |
3179 | bdevname(ds->bdev, ds->name); | |
3180 | ds->name[BDEVNAME_SIZE - 1] = '\0'; | |
3181 | for (p = ds->name; *p != '\0'; p++); | |
3182 | while (p > ds->name && *p != '/') | |
3183 | p--; | |
3184 | if (*p == '/') | |
3185 | p++; | |
3186 | strlcpy(ds->name, p, sizeof(ds->name)); | |
3187 | btrfsic_dev_state_hashtable_add(ds, | |
3188 | &btrfsic_dev_state_hashtable); | |
3189 | } | |
3190 | ||
3191 | ret = btrfsic_process_superblock(state, fs_devices); | |
3192 | if (0 != ret) { | |
3193 | mutex_unlock(&btrfsic_mutex); | |
3194 | btrfsic_unmount(root, fs_devices); | |
3195 | return ret; | |
3196 | } | |
3197 | ||
3198 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_DATABASE) | |
3199 | btrfsic_dump_database(state); | |
3200 | if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_TREE) | |
3201 | btrfsic_dump_tree(state); | |
3202 | ||
3203 | mutex_unlock(&btrfsic_mutex); | |
3204 | return 0; | |
3205 | } | |
3206 | ||
3207 | void btrfsic_unmount(struct btrfs_root *root, | |
3208 | struct btrfs_fs_devices *fs_devices) | |
3209 | { | |
3210 | struct list_head *elem_all; | |
3211 | struct list_head *tmp_all; | |
3212 | struct btrfsic_state *state; | |
3213 | struct list_head *dev_head = &fs_devices->devices; | |
3214 | struct btrfs_device *device; | |
3215 | ||
3216 | if (!btrfsic_is_initialized) | |
3217 | return; | |
3218 | ||
3219 | mutex_lock(&btrfsic_mutex); | |
3220 | ||
3221 | state = NULL; | |
3222 | list_for_each_entry(device, dev_head, dev_list) { | |
3223 | struct btrfsic_dev_state *ds; | |
3224 | ||
3225 | if (!device->bdev || !device->name) | |
3226 | continue; | |
3227 | ||
3228 | ds = btrfsic_dev_state_hashtable_lookup( | |
3229 | device->bdev, | |
3230 | &btrfsic_dev_state_hashtable); | |
3231 | if (NULL != ds) { | |
3232 | state = ds->state; | |
3233 | btrfsic_dev_state_hashtable_remove(ds); | |
3234 | btrfsic_dev_state_free(ds); | |
3235 | } | |
3236 | } | |
3237 | ||
3238 | if (NULL == state) { | |
3239 | printk(KERN_INFO | |
3240 | "btrfsic: error, cannot find state information" | |
3241 | " on umount!\n"); | |
3242 | mutex_unlock(&btrfsic_mutex); | |
3243 | return; | |
3244 | } | |
3245 | ||
3246 | /* | |
3247 | * Don't care about keeping the lists' state up to date, | |
3248 | * just free all memory that was allocated dynamically. | |
3249 | * Free the blocks and the block_links. | |
3250 | */ | |
3251 | list_for_each_safe(elem_all, tmp_all, &state->all_blocks_list) { | |
3252 | struct btrfsic_block *const b_all = | |
3253 | list_entry(elem_all, struct btrfsic_block, | |
3254 | all_blocks_node); | |
3255 | struct list_head *elem_ref_to; | |
3256 | struct list_head *tmp_ref_to; | |
3257 | ||
3258 | list_for_each_safe(elem_ref_to, tmp_ref_to, | |
3259 | &b_all->ref_to_list) { | |
3260 | struct btrfsic_block_link *const l = | |
3261 | list_entry(elem_ref_to, | |
3262 | struct btrfsic_block_link, | |
3263 | node_ref_to); | |
3264 | ||
3265 | if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) | |
3266 | btrfsic_print_rem_link(state, l); | |
3267 | ||
3268 | l->ref_cnt--; | |
3269 | if (0 == l->ref_cnt) | |
3270 | btrfsic_block_link_free(l); | |
3271 | } | |
3272 | ||
48235a68 | 3273 | if (b_all->is_iodone || b_all->never_written) |
5db02760 SB |
3274 | btrfsic_block_free(b_all); |
3275 | else | |
3276 | printk(KERN_INFO "btrfs: attempt to free %c-block" | |
3277 | " @%llu (%s/%llu/%d) on umount which is" | |
3278 | " not yet iodone!\n", | |
3279 | btrfsic_get_block_type(state, b_all), | |
c1c9ff7c GU |
3280 | b_all->logical_bytenr, b_all->dev_state->name, |
3281 | b_all->dev_bytenr, b_all->mirror_num); | |
5db02760 SB |
3282 | } |
3283 | ||
3284 | mutex_unlock(&btrfsic_mutex); | |
3285 | ||
3286 | kfree(state); | |
3287 | } |