Commit | Line | Data |
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7eada909 MP |
1 | /* |
2 | * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved. | |
3 | * Copyright (C) 2016-2017 Milan Broz | |
4 | * Copyright (C) 2016-2017 Mikulas Patocka | |
5 | * | |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
d3e632f0 | 9 | #include <linux/compiler.h> |
7eada909 MP |
10 | #include <linux/module.h> |
11 | #include <linux/device-mapper.h> | |
12 | #include <linux/dm-io.h> | |
13 | #include <linux/vmalloc.h> | |
14 | #include <linux/sort.h> | |
15 | #include <linux/rbtree.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/random.h> | |
18 | #include <crypto/hash.h> | |
19 | #include <crypto/skcipher.h> | |
20 | #include <linux/async_tx.h> | |
afa53df8 | 21 | #include <linux/dm-bufio.h> |
7eada909 MP |
22 | |
23 | #define DM_MSG_PREFIX "integrity" | |
24 | ||
25 | #define DEFAULT_INTERLEAVE_SECTORS 32768 | |
26 | #define DEFAULT_JOURNAL_SIZE_FACTOR 7 | |
27 | #define DEFAULT_BUFFER_SECTORS 128 | |
28 | #define DEFAULT_JOURNAL_WATERMARK 50 | |
29 | #define DEFAULT_SYNC_MSEC 10000 | |
30 | #define DEFAULT_MAX_JOURNAL_SECTORS 131072 | |
56b67a4f MP |
31 | #define MIN_LOG2_INTERLEAVE_SECTORS 3 |
32 | #define MAX_LOG2_INTERLEAVE_SECTORS 31 | |
7eada909 | 33 | #define METADATA_WORKQUEUE_MAX_ACTIVE 16 |
a3fcf725 MP |
34 | #define RECALC_SECTORS 8192 |
35 | #define RECALC_WRITE_SUPER 16 | |
7eada909 MP |
36 | |
37 | /* | |
38 | * Warning - DEBUG_PRINT prints security-sensitive data to the log, | |
39 | * so it should not be enabled in the official kernel | |
40 | */ | |
41 | //#define DEBUG_PRINT | |
42 | //#define INTERNAL_VERIFY | |
43 | ||
44 | /* | |
45 | * On disk structures | |
46 | */ | |
47 | ||
48 | #define SB_MAGIC "integrt" | |
1f9fc0b8 MP |
49 | #define SB_VERSION_1 1 |
50 | #define SB_VERSION_2 2 | |
7eada909 | 51 | #define SB_SECTORS 8 |
9d609f85 | 52 | #define MAX_SECTORS_PER_BLOCK 8 |
7eada909 MP |
53 | |
54 | struct superblock { | |
55 | __u8 magic[8]; | |
56 | __u8 version; | |
57 | __u8 log2_interleave_sectors; | |
58 | __u16 integrity_tag_size; | |
59 | __u32 journal_sections; | |
60 | __u64 provided_data_sectors; /* userspace uses this value */ | |
61 | __u32 flags; | |
9d609f85 | 62 | __u8 log2_sectors_per_block; |
a3fcf725 MP |
63 | __u8 pad[3]; |
64 | __u64 recalc_sector; | |
7eada909 MP |
65 | }; |
66 | ||
67 | #define SB_FLAG_HAVE_JOURNAL_MAC 0x1 | |
a3fcf725 | 68 | #define SB_FLAG_RECALCULATING 0x2 |
7eada909 MP |
69 | |
70 | #define JOURNAL_ENTRY_ROUNDUP 8 | |
71 | ||
72 | typedef __u64 commit_id_t; | |
73 | #define JOURNAL_MAC_PER_SECTOR 8 | |
74 | ||
75 | struct journal_entry { | |
76 | union { | |
77 | struct { | |
78 | __u32 sector_lo; | |
79 | __u32 sector_hi; | |
80 | } s; | |
81 | __u64 sector; | |
82 | } u; | |
9d609f85 MP |
83 | commit_id_t last_bytes[0]; |
84 | /* __u8 tag[0]; */ | |
7eada909 MP |
85 | }; |
86 | ||
9d609f85 MP |
87 | #define journal_entry_tag(ic, je) ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block]) |
88 | ||
7eada909 | 89 | #if BITS_PER_LONG == 64 |
d3e632f0 | 90 | #define journal_entry_set_sector(je, x) do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0) |
7eada909 MP |
91 | #define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector) |
92 | #elif defined(CONFIG_LBDAF) | |
d3e632f0 | 93 | #define journal_entry_set_sector(je, x) do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); WRITE_ONCE((je)->u.s.sector_hi, cpu_to_le32((x) >> 32)); } while (0) |
7eada909 MP |
94 | #define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector) |
95 | #else | |
d3e632f0 | 96 | #define journal_entry_set_sector(je, x) do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); WRITE_ONCE((je)->u.s.sector_hi, cpu_to_le32(0)); } while (0) |
7eada909 MP |
97 | #define journal_entry_get_sector(je) le32_to_cpu((je)->u.s.sector_lo) |
98 | #endif | |
99 | #define journal_entry_is_unused(je) ((je)->u.s.sector_hi == cpu_to_le32(-1)) | |
100 | #define journal_entry_set_unused(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0) | |
101 | #define journal_entry_is_inprogress(je) ((je)->u.s.sector_hi == cpu_to_le32(-2)) | |
102 | #define journal_entry_set_inprogress(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0) | |
103 | ||
104 | #define JOURNAL_BLOCK_SECTORS 8 | |
105 | #define JOURNAL_SECTOR_DATA ((1 << SECTOR_SHIFT) - sizeof(commit_id_t)) | |
106 | #define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS) | |
107 | ||
108 | struct journal_sector { | |
109 | __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR]; | |
110 | __u8 mac[JOURNAL_MAC_PER_SECTOR]; | |
111 | commit_id_t commit_id; | |
112 | }; | |
113 | ||
9d609f85 | 114 | #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK])) |
7eada909 MP |
115 | |
116 | #define METADATA_PADDING_SECTORS 8 | |
117 | ||
118 | #define N_COMMIT_IDS 4 | |
119 | ||
120 | static unsigned char prev_commit_seq(unsigned char seq) | |
121 | { | |
122 | return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS; | |
123 | } | |
124 | ||
125 | static unsigned char next_commit_seq(unsigned char seq) | |
126 | { | |
127 | return (seq + 1) % N_COMMIT_IDS; | |
128 | } | |
129 | ||
130 | /* | |
131 | * In-memory structures | |
132 | */ | |
133 | ||
134 | struct journal_node { | |
135 | struct rb_node node; | |
136 | sector_t sector; | |
137 | }; | |
138 | ||
139 | struct alg_spec { | |
140 | char *alg_string; | |
141 | char *key_string; | |
142 | __u8 *key; | |
143 | unsigned key_size; | |
144 | }; | |
145 | ||
146 | struct dm_integrity_c { | |
147 | struct dm_dev *dev; | |
356d9d52 | 148 | struct dm_dev *meta_dev; |
7eada909 MP |
149 | unsigned tag_size; |
150 | __s8 log2_tag_size; | |
151 | sector_t start; | |
6f1c819c | 152 | mempool_t journal_io_mempool; |
7eada909 MP |
153 | struct dm_io_client *io; |
154 | struct dm_bufio_client *bufio; | |
155 | struct workqueue_struct *metadata_wq; | |
156 | struct superblock *sb; | |
157 | unsigned journal_pages; | |
158 | struct page_list *journal; | |
159 | struct page_list *journal_io; | |
160 | struct page_list *journal_xor; | |
161 | ||
162 | struct crypto_skcipher *journal_crypt; | |
163 | struct scatterlist **journal_scatterlist; | |
164 | struct scatterlist **journal_io_scatterlist; | |
165 | struct skcipher_request **sk_requests; | |
166 | ||
167 | struct crypto_shash *journal_mac; | |
168 | ||
169 | struct journal_node *journal_tree; | |
170 | struct rb_root journal_tree_root; | |
171 | ||
172 | sector_t provided_data_sectors; | |
173 | ||
174 | unsigned short journal_entry_size; | |
175 | unsigned char journal_entries_per_sector; | |
176 | unsigned char journal_section_entries; | |
9d609f85 | 177 | unsigned short journal_section_sectors; |
7eada909 MP |
178 | unsigned journal_sections; |
179 | unsigned journal_entries; | |
356d9d52 MP |
180 | sector_t data_device_sectors; |
181 | sector_t meta_device_sectors; | |
7eada909 MP |
182 | unsigned initial_sectors; |
183 | unsigned metadata_run; | |
184 | __s8 log2_metadata_run; | |
185 | __u8 log2_buffer_sectors; | |
9d609f85 | 186 | __u8 sectors_per_block; |
7eada909 MP |
187 | |
188 | unsigned char mode; | |
c21b1639 | 189 | int suspending; |
7eada909 MP |
190 | |
191 | int failed; | |
192 | ||
193 | struct crypto_shash *internal_hash; | |
194 | ||
195 | /* these variables are locked with endio_wait.lock */ | |
196 | struct rb_root in_progress; | |
724376a0 | 197 | struct list_head wait_list; |
7eada909 MP |
198 | wait_queue_head_t endio_wait; |
199 | struct workqueue_struct *wait_wq; | |
200 | ||
201 | unsigned char commit_seq; | |
202 | commit_id_t commit_ids[N_COMMIT_IDS]; | |
203 | ||
204 | unsigned committed_section; | |
205 | unsigned n_committed_sections; | |
206 | ||
207 | unsigned uncommitted_section; | |
208 | unsigned n_uncommitted_sections; | |
209 | ||
210 | unsigned free_section; | |
211 | unsigned char free_section_entry; | |
212 | unsigned free_sectors; | |
213 | ||
214 | unsigned free_sectors_threshold; | |
215 | ||
216 | struct workqueue_struct *commit_wq; | |
217 | struct work_struct commit_work; | |
218 | ||
219 | struct workqueue_struct *writer_wq; | |
220 | struct work_struct writer_work; | |
221 | ||
a3fcf725 MP |
222 | struct workqueue_struct *recalc_wq; |
223 | struct work_struct recalc_work; | |
224 | u8 *recalc_buffer; | |
225 | u8 *recalc_tags; | |
226 | ||
7eada909 MP |
227 | struct bio_list flush_bio_list; |
228 | ||
229 | unsigned long autocommit_jiffies; | |
230 | struct timer_list autocommit_timer; | |
231 | unsigned autocommit_msec; | |
232 | ||
233 | wait_queue_head_t copy_to_journal_wait; | |
234 | ||
235 | struct completion crypto_backoff; | |
236 | ||
237 | bool journal_uptodate; | |
238 | bool just_formatted; | |
239 | ||
240 | struct alg_spec internal_hash_alg; | |
241 | struct alg_spec journal_crypt_alg; | |
242 | struct alg_spec journal_mac_alg; | |
3f2e5393 MP |
243 | |
244 | atomic64_t number_of_mismatches; | |
7eada909 MP |
245 | }; |
246 | ||
247 | struct dm_integrity_range { | |
248 | sector_t logical_sector; | |
249 | unsigned n_sectors; | |
724376a0 MP |
250 | bool waiting; |
251 | union { | |
252 | struct rb_node node; | |
253 | struct { | |
254 | struct task_struct *task; | |
255 | struct list_head wait_entry; | |
256 | }; | |
257 | }; | |
7eada909 MP |
258 | }; |
259 | ||
260 | struct dm_integrity_io { | |
261 | struct work_struct work; | |
262 | ||
263 | struct dm_integrity_c *ic; | |
264 | bool write; | |
265 | bool fua; | |
266 | ||
267 | struct dm_integrity_range range; | |
268 | ||
269 | sector_t metadata_block; | |
270 | unsigned metadata_offset; | |
271 | ||
272 | atomic_t in_flight; | |
4e4cbee9 | 273 | blk_status_t bi_status; |
7eada909 MP |
274 | |
275 | struct completion *completion; | |
276 | ||
74d46992 CH |
277 | struct gendisk *orig_bi_disk; |
278 | u8 orig_bi_partno; | |
7eada909 MP |
279 | bio_end_io_t *orig_bi_end_io; |
280 | struct bio_integrity_payload *orig_bi_integrity; | |
281 | struct bvec_iter orig_bi_iter; | |
282 | }; | |
283 | ||
284 | struct journal_completion { | |
285 | struct dm_integrity_c *ic; | |
286 | atomic_t in_flight; | |
287 | struct completion comp; | |
288 | }; | |
289 | ||
290 | struct journal_io { | |
291 | struct dm_integrity_range range; | |
292 | struct journal_completion *comp; | |
293 | }; | |
294 | ||
295 | static struct kmem_cache *journal_io_cache; | |
296 | ||
297 | #define JOURNAL_IO_MEMPOOL 32 | |
298 | ||
299 | #ifdef DEBUG_PRINT | |
300 | #define DEBUG_print(x, ...) printk(KERN_DEBUG x, ##__VA_ARGS__) | |
301 | static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...) | |
302 | { | |
303 | va_list args; | |
304 | va_start(args, msg); | |
305 | vprintk(msg, args); | |
306 | va_end(args); | |
307 | if (len) | |
308 | pr_cont(":"); | |
309 | while (len) { | |
310 | pr_cont(" %02x", *bytes); | |
311 | bytes++; | |
312 | len--; | |
313 | } | |
314 | pr_cont("\n"); | |
315 | } | |
316 | #define DEBUG_bytes(bytes, len, msg, ...) __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__) | |
317 | #else | |
318 | #define DEBUG_print(x, ...) do { } while (0) | |
319 | #define DEBUG_bytes(bytes, len, msg, ...) do { } while (0) | |
320 | #endif | |
321 | ||
322 | /* | |
323 | * DM Integrity profile, protection is performed layer above (dm-crypt) | |
324 | */ | |
7c373d66 | 325 | static const struct blk_integrity_profile dm_integrity_profile = { |
7eada909 MP |
326 | .name = "DM-DIF-EXT-TAG", |
327 | .generate_fn = NULL, | |
328 | .verify_fn = NULL, | |
329 | }; | |
330 | ||
331 | static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map); | |
332 | static void integrity_bio_wait(struct work_struct *w); | |
333 | static void dm_integrity_dtr(struct dm_target *ti); | |
334 | ||
335 | static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err) | |
336 | { | |
3f2e5393 MP |
337 | if (err == -EILSEQ) |
338 | atomic64_inc(&ic->number_of_mismatches); | |
7eada909 MP |
339 | if (!cmpxchg(&ic->failed, 0, err)) |
340 | DMERR("Error on %s: %d", msg, err); | |
341 | } | |
342 | ||
343 | static int dm_integrity_failed(struct dm_integrity_c *ic) | |
344 | { | |
d3e632f0 | 345 | return READ_ONCE(ic->failed); |
7eada909 MP |
346 | } |
347 | ||
348 | static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i, | |
349 | unsigned j, unsigned char seq) | |
350 | { | |
351 | /* | |
352 | * Xor the number with section and sector, so that if a piece of | |
353 | * journal is written at wrong place, it is detected. | |
354 | */ | |
355 | return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j); | |
356 | } | |
357 | ||
358 | static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector, | |
359 | sector_t *area, sector_t *offset) | |
360 | { | |
356d9d52 MP |
361 | if (!ic->meta_dev) { |
362 | __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors; | |
363 | *area = data_sector >> log2_interleave_sectors; | |
364 | *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1); | |
365 | } else { | |
366 | *area = 0; | |
367 | *offset = data_sector; | |
368 | } | |
7eada909 MP |
369 | } |
370 | ||
9d609f85 MP |
371 | #define sector_to_block(ic, n) \ |
372 | do { \ | |
373 | BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1)); \ | |
374 | (n) >>= (ic)->sb->log2_sectors_per_block; \ | |
375 | } while (0) | |
376 | ||
7eada909 MP |
377 | static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area, |
378 | sector_t offset, unsigned *metadata_offset) | |
379 | { | |
380 | __u64 ms; | |
381 | unsigned mo; | |
382 | ||
383 | ms = area << ic->sb->log2_interleave_sectors; | |
384 | if (likely(ic->log2_metadata_run >= 0)) | |
385 | ms += area << ic->log2_metadata_run; | |
386 | else | |
387 | ms += area * ic->metadata_run; | |
388 | ms >>= ic->log2_buffer_sectors; | |
389 | ||
9d609f85 MP |
390 | sector_to_block(ic, offset); |
391 | ||
7eada909 MP |
392 | if (likely(ic->log2_tag_size >= 0)) { |
393 | ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size); | |
394 | mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1); | |
395 | } else { | |
396 | ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors); | |
397 | mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1); | |
398 | } | |
399 | *metadata_offset = mo; | |
400 | return ms; | |
401 | } | |
402 | ||
403 | static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset) | |
404 | { | |
405 | sector_t result; | |
406 | ||
356d9d52 MP |
407 | if (ic->meta_dev) |
408 | return offset; | |
409 | ||
7eada909 MP |
410 | result = area << ic->sb->log2_interleave_sectors; |
411 | if (likely(ic->log2_metadata_run >= 0)) | |
412 | result += (area + 1) << ic->log2_metadata_run; | |
413 | else | |
414 | result += (area + 1) * ic->metadata_run; | |
415 | ||
416 | result += (sector_t)ic->initial_sectors + offset; | |
71e9ddbc MP |
417 | result += ic->start; |
418 | ||
7eada909 MP |
419 | return result; |
420 | } | |
421 | ||
422 | static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr) | |
423 | { | |
424 | if (unlikely(*sec_ptr >= ic->journal_sections)) | |
425 | *sec_ptr -= ic->journal_sections; | |
426 | } | |
427 | ||
1f9fc0b8 MP |
428 | static void sb_set_version(struct dm_integrity_c *ic) |
429 | { | |
a3fcf725 | 430 | if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) |
1f9fc0b8 MP |
431 | ic->sb->version = SB_VERSION_2; |
432 | else | |
433 | ic->sb->version = SB_VERSION_1; | |
434 | } | |
435 | ||
7eada909 MP |
436 | static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags) |
437 | { | |
438 | struct dm_io_request io_req; | |
439 | struct dm_io_region io_loc; | |
440 | ||
441 | io_req.bi_op = op; | |
442 | io_req.bi_op_flags = op_flags; | |
443 | io_req.mem.type = DM_IO_KMEM; | |
444 | io_req.mem.ptr.addr = ic->sb; | |
445 | io_req.notify.fn = NULL; | |
446 | io_req.client = ic->io; | |
356d9d52 | 447 | io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev; |
7eada909 MP |
448 | io_loc.sector = ic->start; |
449 | io_loc.count = SB_SECTORS; | |
450 | ||
451 | return dm_io(&io_req, 1, &io_loc, NULL); | |
452 | } | |
453 | ||
454 | static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset, | |
455 | bool e, const char *function) | |
456 | { | |
457 | #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY) | |
458 | unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors; | |
459 | ||
460 | if (unlikely(section >= ic->journal_sections) || | |
461 | unlikely(offset >= limit)) { | |
462 | printk(KERN_CRIT "%s: invalid access at (%u,%u), limit (%u,%u)\n", | |
463 | function, section, offset, ic->journal_sections, limit); | |
464 | BUG(); | |
465 | } | |
466 | #endif | |
467 | } | |
468 | ||
469 | static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset, | |
470 | unsigned *pl_index, unsigned *pl_offset) | |
471 | { | |
472 | unsigned sector; | |
473 | ||
56b67a4f | 474 | access_journal_check(ic, section, offset, false, "page_list_location"); |
7eada909 MP |
475 | |
476 | sector = section * ic->journal_section_sectors + offset; | |
477 | ||
478 | *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); | |
479 | *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); | |
480 | } | |
481 | ||
482 | static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl, | |
483 | unsigned section, unsigned offset, unsigned *n_sectors) | |
484 | { | |
485 | unsigned pl_index, pl_offset; | |
486 | char *va; | |
487 | ||
488 | page_list_location(ic, section, offset, &pl_index, &pl_offset); | |
489 | ||
490 | if (n_sectors) | |
491 | *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT; | |
492 | ||
493 | va = lowmem_page_address(pl[pl_index].page); | |
494 | ||
495 | return (struct journal_sector *)(va + pl_offset); | |
496 | } | |
497 | ||
498 | static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset) | |
499 | { | |
500 | return access_page_list(ic, ic->journal, section, offset, NULL); | |
501 | } | |
502 | ||
503 | static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n) | |
504 | { | |
505 | unsigned rel_sector, offset; | |
506 | struct journal_sector *js; | |
507 | ||
508 | access_journal_check(ic, section, n, true, "access_journal_entry"); | |
509 | ||
510 | rel_sector = n % JOURNAL_BLOCK_SECTORS; | |
511 | offset = n / JOURNAL_BLOCK_SECTORS; | |
512 | ||
513 | js = access_journal(ic, section, rel_sector); | |
514 | return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size); | |
515 | } | |
516 | ||
517 | static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n) | |
518 | { | |
9d609f85 | 519 | n <<= ic->sb->log2_sectors_per_block; |
7eada909 | 520 | |
9d609f85 MP |
521 | n += JOURNAL_BLOCK_SECTORS; |
522 | ||
523 | access_journal_check(ic, section, n, false, "access_journal_data"); | |
524 | ||
525 | return access_journal(ic, section, n); | |
7eada909 MP |
526 | } |
527 | ||
528 | static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE]) | |
529 | { | |
530 | SHASH_DESC_ON_STACK(desc, ic->journal_mac); | |
531 | int r; | |
532 | unsigned j, size; | |
533 | ||
534 | desc->tfm = ic->journal_mac; | |
432061b3 | 535 | desc->flags = 0; |
7eada909 MP |
536 | |
537 | r = crypto_shash_init(desc); | |
538 | if (unlikely(r)) { | |
539 | dm_integrity_io_error(ic, "crypto_shash_init", r); | |
540 | goto err; | |
541 | } | |
542 | ||
543 | for (j = 0; j < ic->journal_section_entries; j++) { | |
544 | struct journal_entry *je = access_journal_entry(ic, section, j); | |
545 | r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector); | |
546 | if (unlikely(r)) { | |
547 | dm_integrity_io_error(ic, "crypto_shash_update", r); | |
548 | goto err; | |
549 | } | |
550 | } | |
551 | ||
552 | size = crypto_shash_digestsize(ic->journal_mac); | |
553 | ||
554 | if (likely(size <= JOURNAL_MAC_SIZE)) { | |
555 | r = crypto_shash_final(desc, result); | |
556 | if (unlikely(r)) { | |
557 | dm_integrity_io_error(ic, "crypto_shash_final", r); | |
558 | goto err; | |
559 | } | |
560 | memset(result + size, 0, JOURNAL_MAC_SIZE - size); | |
561 | } else { | |
6d39a124 KC |
562 | __u8 digest[HASH_MAX_DIGESTSIZE]; |
563 | ||
564 | if (WARN_ON(size > sizeof(digest))) { | |
565 | dm_integrity_io_error(ic, "digest_size", -EINVAL); | |
566 | goto err; | |
567 | } | |
7eada909 MP |
568 | r = crypto_shash_final(desc, digest); |
569 | if (unlikely(r)) { | |
570 | dm_integrity_io_error(ic, "crypto_shash_final", r); | |
571 | goto err; | |
572 | } | |
573 | memcpy(result, digest, JOURNAL_MAC_SIZE); | |
574 | } | |
575 | ||
576 | return; | |
577 | err: | |
578 | memset(result, 0, JOURNAL_MAC_SIZE); | |
579 | } | |
580 | ||
581 | static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr) | |
582 | { | |
583 | __u8 result[JOURNAL_MAC_SIZE]; | |
584 | unsigned j; | |
585 | ||
586 | if (!ic->journal_mac) | |
587 | return; | |
588 | ||
589 | section_mac(ic, section, result); | |
590 | ||
591 | for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) { | |
592 | struct journal_sector *js = access_journal(ic, section, j); | |
593 | ||
594 | if (likely(wr)) | |
595 | memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR); | |
596 | else { | |
597 | if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) | |
598 | dm_integrity_io_error(ic, "journal mac", -EILSEQ); | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | static void complete_journal_op(void *context) | |
604 | { | |
605 | struct journal_completion *comp = context; | |
606 | BUG_ON(!atomic_read(&comp->in_flight)); | |
607 | if (likely(atomic_dec_and_test(&comp->in_flight))) | |
608 | complete(&comp->comp); | |
609 | } | |
610 | ||
611 | static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section, | |
612 | unsigned n_sections, struct journal_completion *comp) | |
613 | { | |
614 | struct async_submit_ctl submit; | |
615 | size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT; | |
616 | unsigned pl_index, pl_offset, section_index; | |
617 | struct page_list *source_pl, *target_pl; | |
618 | ||
619 | if (likely(encrypt)) { | |
620 | source_pl = ic->journal; | |
621 | target_pl = ic->journal_io; | |
622 | } else { | |
623 | source_pl = ic->journal_io; | |
624 | target_pl = ic->journal; | |
625 | } | |
626 | ||
627 | page_list_location(ic, section, 0, &pl_index, &pl_offset); | |
628 | ||
629 | atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight); | |
630 | ||
631 | init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL); | |
632 | ||
633 | section_index = pl_index; | |
634 | ||
635 | do { | |
636 | size_t this_step; | |
637 | struct page *src_pages[2]; | |
638 | struct page *dst_page; | |
639 | ||
640 | while (unlikely(pl_index == section_index)) { | |
641 | unsigned dummy; | |
642 | if (likely(encrypt)) | |
643 | rw_section_mac(ic, section, true); | |
644 | section++; | |
645 | n_sections--; | |
646 | if (!n_sections) | |
647 | break; | |
648 | page_list_location(ic, section, 0, §ion_index, &dummy); | |
649 | } | |
650 | ||
651 | this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset); | |
652 | dst_page = target_pl[pl_index].page; | |
653 | src_pages[0] = source_pl[pl_index].page; | |
654 | src_pages[1] = ic->journal_xor[pl_index].page; | |
655 | ||
656 | async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit); | |
657 | ||
658 | pl_index++; | |
659 | pl_offset = 0; | |
660 | n_bytes -= this_step; | |
661 | } while (n_bytes); | |
662 | ||
663 | BUG_ON(n_sections); | |
664 | ||
665 | async_tx_issue_pending_all(); | |
666 | } | |
667 | ||
668 | static void complete_journal_encrypt(struct crypto_async_request *req, int err) | |
669 | { | |
670 | struct journal_completion *comp = req->data; | |
671 | if (unlikely(err)) { | |
672 | if (likely(err == -EINPROGRESS)) { | |
673 | complete(&comp->ic->crypto_backoff); | |
674 | return; | |
675 | } | |
676 | dm_integrity_io_error(comp->ic, "asynchronous encrypt", err); | |
677 | } | |
678 | complete_journal_op(comp); | |
679 | } | |
680 | ||
681 | static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp) | |
682 | { | |
683 | int r; | |
432061b3 | 684 | skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
7eada909 MP |
685 | complete_journal_encrypt, comp); |
686 | if (likely(encrypt)) | |
687 | r = crypto_skcipher_encrypt(req); | |
688 | else | |
689 | r = crypto_skcipher_decrypt(req); | |
690 | if (likely(!r)) | |
691 | return false; | |
692 | if (likely(r == -EINPROGRESS)) | |
693 | return true; | |
694 | if (likely(r == -EBUSY)) { | |
695 | wait_for_completion(&comp->ic->crypto_backoff); | |
696 | reinit_completion(&comp->ic->crypto_backoff); | |
697 | return true; | |
698 | } | |
699 | dm_integrity_io_error(comp->ic, "encrypt", r); | |
700 | return false; | |
701 | } | |
702 | ||
703 | static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section, | |
704 | unsigned n_sections, struct journal_completion *comp) | |
705 | { | |
706 | struct scatterlist **source_sg; | |
707 | struct scatterlist **target_sg; | |
708 | ||
709 | atomic_add(2, &comp->in_flight); | |
710 | ||
711 | if (likely(encrypt)) { | |
712 | source_sg = ic->journal_scatterlist; | |
713 | target_sg = ic->journal_io_scatterlist; | |
714 | } else { | |
715 | source_sg = ic->journal_io_scatterlist; | |
716 | target_sg = ic->journal_scatterlist; | |
717 | } | |
718 | ||
719 | do { | |
720 | struct skcipher_request *req; | |
721 | unsigned ivsize; | |
722 | char *iv; | |
723 | ||
724 | if (likely(encrypt)) | |
725 | rw_section_mac(ic, section, true); | |
726 | ||
727 | req = ic->sk_requests[section]; | |
728 | ivsize = crypto_skcipher_ivsize(ic->journal_crypt); | |
729 | iv = req->iv; | |
730 | ||
731 | memcpy(iv, iv + ivsize, ivsize); | |
732 | ||
733 | req->src = source_sg[section]; | |
734 | req->dst = target_sg[section]; | |
735 | ||
736 | if (unlikely(do_crypt(encrypt, req, comp))) | |
737 | atomic_inc(&comp->in_flight); | |
738 | ||
739 | section++; | |
740 | n_sections--; | |
741 | } while (n_sections); | |
742 | ||
743 | atomic_dec(&comp->in_flight); | |
744 | complete_journal_op(comp); | |
745 | } | |
746 | ||
747 | static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section, | |
748 | unsigned n_sections, struct journal_completion *comp) | |
749 | { | |
750 | if (ic->journal_xor) | |
751 | return xor_journal(ic, encrypt, section, n_sections, comp); | |
752 | else | |
753 | return crypt_journal(ic, encrypt, section, n_sections, comp); | |
754 | } | |
755 | ||
756 | static void complete_journal_io(unsigned long error, void *context) | |
757 | { | |
758 | struct journal_completion *comp = context; | |
759 | if (unlikely(error != 0)) | |
760 | dm_integrity_io_error(comp->ic, "writing journal", -EIO); | |
761 | complete_journal_op(comp); | |
762 | } | |
763 | ||
764 | static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section, | |
765 | unsigned n_sections, struct journal_completion *comp) | |
766 | { | |
767 | struct dm_io_request io_req; | |
768 | struct dm_io_region io_loc; | |
769 | unsigned sector, n_sectors, pl_index, pl_offset; | |
770 | int r; | |
771 | ||
772 | if (unlikely(dm_integrity_failed(ic))) { | |
773 | if (comp) | |
774 | complete_journal_io(-1UL, comp); | |
775 | return; | |
776 | } | |
777 | ||
778 | sector = section * ic->journal_section_sectors; | |
779 | n_sectors = n_sections * ic->journal_section_sectors; | |
780 | ||
781 | pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); | |
782 | pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); | |
783 | ||
784 | io_req.bi_op = op; | |
785 | io_req.bi_op_flags = op_flags; | |
786 | io_req.mem.type = DM_IO_PAGE_LIST; | |
787 | if (ic->journal_io) | |
788 | io_req.mem.ptr.pl = &ic->journal_io[pl_index]; | |
789 | else | |
790 | io_req.mem.ptr.pl = &ic->journal[pl_index]; | |
791 | io_req.mem.offset = pl_offset; | |
792 | if (likely(comp != NULL)) { | |
793 | io_req.notify.fn = complete_journal_io; | |
794 | io_req.notify.context = comp; | |
795 | } else { | |
796 | io_req.notify.fn = NULL; | |
797 | } | |
798 | io_req.client = ic->io; | |
356d9d52 | 799 | io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev; |
7eada909 MP |
800 | io_loc.sector = ic->start + SB_SECTORS + sector; |
801 | io_loc.count = n_sectors; | |
802 | ||
803 | r = dm_io(&io_req, 1, &io_loc, NULL); | |
804 | if (unlikely(r)) { | |
805 | dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r); | |
806 | if (comp) { | |
807 | WARN_ONCE(1, "asynchronous dm_io failed: %d", r); | |
808 | complete_journal_io(-1UL, comp); | |
809 | } | |
810 | } | |
811 | } | |
812 | ||
813 | static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections) | |
814 | { | |
815 | struct journal_completion io_comp; | |
816 | struct journal_completion crypt_comp_1; | |
817 | struct journal_completion crypt_comp_2; | |
818 | unsigned i; | |
819 | ||
820 | io_comp.ic = ic; | |
b5e8ad92 | 821 | init_completion(&io_comp.comp); |
7eada909 MP |
822 | |
823 | if (commit_start + commit_sections <= ic->journal_sections) { | |
824 | io_comp.in_flight = (atomic_t)ATOMIC_INIT(1); | |
825 | if (ic->journal_io) { | |
826 | crypt_comp_1.ic = ic; | |
b5e8ad92 | 827 | init_completion(&crypt_comp_1.comp); |
7eada909 MP |
828 | crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); |
829 | encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1); | |
830 | wait_for_completion_io(&crypt_comp_1.comp); | |
831 | } else { | |
832 | for (i = 0; i < commit_sections; i++) | |
833 | rw_section_mac(ic, commit_start + i, true); | |
834 | } | |
ff0361b3 JK |
835 | rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start, |
836 | commit_sections, &io_comp); | |
7eada909 MP |
837 | } else { |
838 | unsigned to_end; | |
839 | io_comp.in_flight = (atomic_t)ATOMIC_INIT(2); | |
840 | to_end = ic->journal_sections - commit_start; | |
841 | if (ic->journal_io) { | |
842 | crypt_comp_1.ic = ic; | |
b5e8ad92 | 843 | init_completion(&crypt_comp_1.comp); |
7eada909 MP |
844 | crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); |
845 | encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1); | |
846 | if (try_wait_for_completion(&crypt_comp_1.comp)) { | |
847 | rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp); | |
b5e8ad92 | 848 | reinit_completion(&crypt_comp_1.comp); |
7eada909 MP |
849 | crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); |
850 | encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1); | |
851 | wait_for_completion_io(&crypt_comp_1.comp); | |
852 | } else { | |
853 | crypt_comp_2.ic = ic; | |
b5e8ad92 | 854 | init_completion(&crypt_comp_2.comp); |
7eada909 MP |
855 | crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0); |
856 | encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2); | |
857 | wait_for_completion_io(&crypt_comp_1.comp); | |
858 | rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp); | |
859 | wait_for_completion_io(&crypt_comp_2.comp); | |
860 | } | |
861 | } else { | |
862 | for (i = 0; i < to_end; i++) | |
863 | rw_section_mac(ic, commit_start + i, true); | |
864 | rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp); | |
865 | for (i = 0; i < commit_sections - to_end; i++) | |
866 | rw_section_mac(ic, i, true); | |
867 | } | |
868 | rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp); | |
869 | } | |
870 | ||
871 | wait_for_completion_io(&io_comp.comp); | |
872 | } | |
873 | ||
874 | static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset, | |
875 | unsigned n_sectors, sector_t target, io_notify_fn fn, void *data) | |
876 | { | |
877 | struct dm_io_request io_req; | |
878 | struct dm_io_region io_loc; | |
879 | int r; | |
880 | unsigned sector, pl_index, pl_offset; | |
881 | ||
9d609f85 MP |
882 | BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1)); |
883 | ||
7eada909 MP |
884 | if (unlikely(dm_integrity_failed(ic))) { |
885 | fn(-1UL, data); | |
886 | return; | |
887 | } | |
888 | ||
889 | sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset; | |
890 | ||
891 | pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); | |
892 | pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); | |
893 | ||
894 | io_req.bi_op = REQ_OP_WRITE; | |
895 | io_req.bi_op_flags = 0; | |
896 | io_req.mem.type = DM_IO_PAGE_LIST; | |
897 | io_req.mem.ptr.pl = &ic->journal[pl_index]; | |
898 | io_req.mem.offset = pl_offset; | |
899 | io_req.notify.fn = fn; | |
900 | io_req.notify.context = data; | |
901 | io_req.client = ic->io; | |
902 | io_loc.bdev = ic->dev->bdev; | |
71e9ddbc | 903 | io_loc.sector = target; |
7eada909 MP |
904 | io_loc.count = n_sectors; |
905 | ||
906 | r = dm_io(&io_req, 1, &io_loc, NULL); | |
907 | if (unlikely(r)) { | |
908 | WARN_ONCE(1, "asynchronous dm_io failed: %d", r); | |
909 | fn(-1UL, data); | |
910 | } | |
911 | } | |
912 | ||
724376a0 MP |
913 | static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2) |
914 | { | |
915 | return range1->logical_sector < range2->logical_sector + range2->n_sectors && | |
916 | range2->logical_sector + range2->n_sectors > range2->logical_sector; | |
917 | } | |
918 | ||
919 | static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting) | |
7eada909 MP |
920 | { |
921 | struct rb_node **n = &ic->in_progress.rb_node; | |
922 | struct rb_node *parent; | |
923 | ||
9d609f85 MP |
924 | BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1)); |
925 | ||
724376a0 MP |
926 | if (likely(check_waiting)) { |
927 | struct dm_integrity_range *range; | |
928 | list_for_each_entry(range, &ic->wait_list, wait_entry) { | |
929 | if (unlikely(ranges_overlap(range, new_range))) | |
930 | return false; | |
931 | } | |
932 | } | |
933 | ||
7eada909 MP |
934 | parent = NULL; |
935 | ||
936 | while (*n) { | |
937 | struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node); | |
938 | ||
939 | parent = *n; | |
940 | if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) { | |
941 | n = &range->node.rb_left; | |
942 | } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) { | |
943 | n = &range->node.rb_right; | |
944 | } else { | |
945 | return false; | |
946 | } | |
947 | } | |
948 | ||
949 | rb_link_node(&new_range->node, parent, n); | |
950 | rb_insert_color(&new_range->node, &ic->in_progress); | |
951 | ||
952 | return true; | |
953 | } | |
954 | ||
955 | static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range) | |
956 | { | |
957 | rb_erase(&range->node, &ic->in_progress); | |
724376a0 MP |
958 | while (unlikely(!list_empty(&ic->wait_list))) { |
959 | struct dm_integrity_range *last_range = | |
960 | list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry); | |
961 | struct task_struct *last_range_task; | |
962 | if (!ranges_overlap(range, last_range)) | |
963 | break; | |
964 | last_range_task = last_range->task; | |
965 | list_del(&last_range->wait_entry); | |
966 | if (!add_new_range(ic, last_range, false)) { | |
967 | last_range->task = last_range_task; | |
968 | list_add(&last_range->wait_entry, &ic->wait_list); | |
969 | break; | |
970 | } | |
971 | last_range->waiting = false; | |
972 | wake_up_process(last_range_task); | |
973 | } | |
7eada909 MP |
974 | } |
975 | ||
976 | static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range) | |
977 | { | |
978 | unsigned long flags; | |
979 | ||
980 | spin_lock_irqsave(&ic->endio_wait.lock, flags); | |
981 | remove_range_unlocked(ic, range); | |
982 | spin_unlock_irqrestore(&ic->endio_wait.lock, flags); | |
983 | } | |
984 | ||
724376a0 MP |
985 | static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range) |
986 | { | |
987 | new_range->waiting = true; | |
988 | list_add_tail(&new_range->wait_entry, &ic->wait_list); | |
989 | new_range->task = current; | |
990 | do { | |
991 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
992 | spin_unlock_irq(&ic->endio_wait.lock); | |
993 | io_schedule(); | |
994 | spin_lock_irq(&ic->endio_wait.lock); | |
995 | } while (unlikely(new_range->waiting)); | |
996 | } | |
997 | ||
7eada909 MP |
998 | static void init_journal_node(struct journal_node *node) |
999 | { | |
1000 | RB_CLEAR_NODE(&node->node); | |
1001 | node->sector = (sector_t)-1; | |
1002 | } | |
1003 | ||
1004 | static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector) | |
1005 | { | |
1006 | struct rb_node **link; | |
1007 | struct rb_node *parent; | |
1008 | ||
1009 | node->sector = sector; | |
1010 | BUG_ON(!RB_EMPTY_NODE(&node->node)); | |
1011 | ||
1012 | link = &ic->journal_tree_root.rb_node; | |
1013 | parent = NULL; | |
1014 | ||
1015 | while (*link) { | |
1016 | struct journal_node *j; | |
1017 | parent = *link; | |
1018 | j = container_of(parent, struct journal_node, node); | |
1019 | if (sector < j->sector) | |
1020 | link = &j->node.rb_left; | |
1021 | else | |
1022 | link = &j->node.rb_right; | |
1023 | } | |
1024 | ||
1025 | rb_link_node(&node->node, parent, link); | |
1026 | rb_insert_color(&node->node, &ic->journal_tree_root); | |
1027 | } | |
1028 | ||
1029 | static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node) | |
1030 | { | |
1031 | BUG_ON(RB_EMPTY_NODE(&node->node)); | |
1032 | rb_erase(&node->node, &ic->journal_tree_root); | |
1033 | init_journal_node(node); | |
1034 | } | |
1035 | ||
1036 | #define NOT_FOUND (-1U) | |
1037 | ||
1038 | static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector) | |
1039 | { | |
1040 | struct rb_node *n = ic->journal_tree_root.rb_node; | |
1041 | unsigned found = NOT_FOUND; | |
1042 | *next_sector = (sector_t)-1; | |
1043 | while (n) { | |
1044 | struct journal_node *j = container_of(n, struct journal_node, node); | |
1045 | if (sector == j->sector) { | |
1046 | found = j - ic->journal_tree; | |
1047 | } | |
1048 | if (sector < j->sector) { | |
1049 | *next_sector = j->sector; | |
1050 | n = j->node.rb_left; | |
1051 | } else { | |
1052 | n = j->node.rb_right; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | return found; | |
1057 | } | |
1058 | ||
1059 | static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector) | |
1060 | { | |
1061 | struct journal_node *node, *next_node; | |
1062 | struct rb_node *next; | |
1063 | ||
1064 | if (unlikely(pos >= ic->journal_entries)) | |
1065 | return false; | |
1066 | node = &ic->journal_tree[pos]; | |
1067 | if (unlikely(RB_EMPTY_NODE(&node->node))) | |
1068 | return false; | |
1069 | if (unlikely(node->sector != sector)) | |
1070 | return false; | |
1071 | ||
1072 | next = rb_next(&node->node); | |
1073 | if (unlikely(!next)) | |
1074 | return true; | |
1075 | ||
1076 | next_node = container_of(next, struct journal_node, node); | |
1077 | return next_node->sector != sector; | |
1078 | } | |
1079 | ||
1080 | static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node) | |
1081 | { | |
1082 | struct rb_node *next; | |
1083 | struct journal_node *next_node; | |
1084 | unsigned next_section; | |
1085 | ||
1086 | BUG_ON(RB_EMPTY_NODE(&node->node)); | |
1087 | ||
1088 | next = rb_next(&node->node); | |
1089 | if (unlikely(!next)) | |
1090 | return false; | |
1091 | ||
1092 | next_node = container_of(next, struct journal_node, node); | |
1093 | ||
1094 | if (next_node->sector != node->sector) | |
1095 | return false; | |
1096 | ||
1097 | next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries; | |
1098 | if (next_section >= ic->committed_section && | |
1099 | next_section < ic->committed_section + ic->n_committed_sections) | |
1100 | return true; | |
1101 | if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections) | |
1102 | return true; | |
1103 | ||
1104 | return false; | |
1105 | } | |
1106 | ||
1107 | #define TAG_READ 0 | |
1108 | #define TAG_WRITE 1 | |
1109 | #define TAG_CMP 2 | |
1110 | ||
1111 | static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block, | |
1112 | unsigned *metadata_offset, unsigned total_size, int op) | |
1113 | { | |
1114 | do { | |
1115 | unsigned char *data, *dp; | |
1116 | struct dm_buffer *b; | |
1117 | unsigned to_copy; | |
1118 | int r; | |
1119 | ||
1120 | r = dm_integrity_failed(ic); | |
1121 | if (unlikely(r)) | |
1122 | return r; | |
1123 | ||
1124 | data = dm_bufio_read(ic->bufio, *metadata_block, &b); | |
1125 | if (unlikely(IS_ERR(data))) | |
1126 | return PTR_ERR(data); | |
1127 | ||
1128 | to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size); | |
1129 | dp = data + *metadata_offset; | |
1130 | if (op == TAG_READ) { | |
1131 | memcpy(tag, dp, to_copy); | |
1132 | } else if (op == TAG_WRITE) { | |
1133 | memcpy(dp, tag, to_copy); | |
1e3b21c6 | 1134 | dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy); |
7eada909 MP |
1135 | } else { |
1136 | /* e.g.: op == TAG_CMP */ | |
1137 | if (unlikely(memcmp(dp, tag, to_copy))) { | |
1138 | unsigned i; | |
1139 | ||
1140 | for (i = 0; i < to_copy; i++) { | |
1141 | if (dp[i] != tag[i]) | |
1142 | break; | |
1143 | total_size--; | |
1144 | } | |
1145 | dm_bufio_release(b); | |
1146 | return total_size; | |
1147 | } | |
1148 | } | |
1149 | dm_bufio_release(b); | |
1150 | ||
1151 | tag += to_copy; | |
1152 | *metadata_offset += to_copy; | |
1153 | if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) { | |
1154 | (*metadata_block)++; | |
1155 | *metadata_offset = 0; | |
1156 | } | |
1157 | total_size -= to_copy; | |
1158 | } while (unlikely(total_size)); | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static void dm_integrity_flush_buffers(struct dm_integrity_c *ic) | |
1164 | { | |
1165 | int r; | |
1166 | r = dm_bufio_write_dirty_buffers(ic->bufio); | |
1167 | if (unlikely(r)) | |
1168 | dm_integrity_io_error(ic, "writing tags", r); | |
1169 | } | |
1170 | ||
1171 | static void sleep_on_endio_wait(struct dm_integrity_c *ic) | |
1172 | { | |
1173 | DECLARE_WAITQUEUE(wait, current); | |
1174 | __add_wait_queue(&ic->endio_wait, &wait); | |
1175 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
1176 | spin_unlock_irq(&ic->endio_wait.lock); | |
1177 | io_schedule(); | |
1178 | spin_lock_irq(&ic->endio_wait.lock); | |
1179 | __remove_wait_queue(&ic->endio_wait, &wait); | |
1180 | } | |
1181 | ||
8376d3c1 | 1182 | static void autocommit_fn(struct timer_list *t) |
7eada909 | 1183 | { |
8376d3c1 | 1184 | struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer); |
7eada909 MP |
1185 | |
1186 | if (likely(!dm_integrity_failed(ic))) | |
1187 | queue_work(ic->commit_wq, &ic->commit_work); | |
1188 | } | |
1189 | ||
1190 | static void schedule_autocommit(struct dm_integrity_c *ic) | |
1191 | { | |
1192 | if (!timer_pending(&ic->autocommit_timer)) | |
1193 | mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies); | |
1194 | } | |
1195 | ||
1196 | static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio) | |
1197 | { | |
1198 | struct bio *bio; | |
7def52b7 MS |
1199 | unsigned long flags; |
1200 | ||
1201 | spin_lock_irqsave(&ic->endio_wait.lock, flags); | |
7eada909 MP |
1202 | bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); |
1203 | bio_list_add(&ic->flush_bio_list, bio); | |
7def52b7 MS |
1204 | spin_unlock_irqrestore(&ic->endio_wait.lock, flags); |
1205 | ||
7eada909 MP |
1206 | queue_work(ic->commit_wq, &ic->commit_work); |
1207 | } | |
1208 | ||
1209 | static void do_endio(struct dm_integrity_c *ic, struct bio *bio) | |
1210 | { | |
1211 | int r = dm_integrity_failed(ic); | |
4e4cbee9 CH |
1212 | if (unlikely(r) && !bio->bi_status) |
1213 | bio->bi_status = errno_to_blk_status(r); | |
7eada909 MP |
1214 | bio_endio(bio); |
1215 | } | |
1216 | ||
1217 | static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio) | |
1218 | { | |
1219 | struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); | |
1220 | ||
4e4cbee9 | 1221 | if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic))) |
7eada909 MP |
1222 | submit_flush_bio(ic, dio); |
1223 | else | |
1224 | do_endio(ic, bio); | |
1225 | } | |
1226 | ||
1227 | static void dec_in_flight(struct dm_integrity_io *dio) | |
1228 | { | |
1229 | if (atomic_dec_and_test(&dio->in_flight)) { | |
1230 | struct dm_integrity_c *ic = dio->ic; | |
1231 | struct bio *bio; | |
1232 | ||
1233 | remove_range(ic, &dio->range); | |
1234 | ||
1235 | if (unlikely(dio->write)) | |
1236 | schedule_autocommit(ic); | |
1237 | ||
1238 | bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); | |
1239 | ||
4e4cbee9 CH |
1240 | if (unlikely(dio->bi_status) && !bio->bi_status) |
1241 | bio->bi_status = dio->bi_status; | |
1242 | if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) { | |
7eada909 MP |
1243 | dio->range.logical_sector += dio->range.n_sectors; |
1244 | bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT); | |
1245 | INIT_WORK(&dio->work, integrity_bio_wait); | |
1246 | queue_work(ic->wait_wq, &dio->work); | |
1247 | return; | |
1248 | } | |
1249 | do_endio_flush(ic, dio); | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | static void integrity_end_io(struct bio *bio) | |
1254 | { | |
1255 | struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); | |
1256 | ||
1257 | bio->bi_iter = dio->orig_bi_iter; | |
74d46992 CH |
1258 | bio->bi_disk = dio->orig_bi_disk; |
1259 | bio->bi_partno = dio->orig_bi_partno; | |
7eada909 MP |
1260 | if (dio->orig_bi_integrity) { |
1261 | bio->bi_integrity = dio->orig_bi_integrity; | |
1262 | bio->bi_opf |= REQ_INTEGRITY; | |
1263 | } | |
1264 | bio->bi_end_io = dio->orig_bi_end_io; | |
1265 | ||
1266 | if (dio->completion) | |
1267 | complete(dio->completion); | |
1268 | ||
1269 | dec_in_flight(dio); | |
1270 | } | |
1271 | ||
1272 | static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector, | |
1273 | const char *data, char *result) | |
1274 | { | |
1275 | __u64 sector_le = cpu_to_le64(sector); | |
1276 | SHASH_DESC_ON_STACK(req, ic->internal_hash); | |
1277 | int r; | |
1278 | unsigned digest_size; | |
1279 | ||
1280 | req->tfm = ic->internal_hash; | |
1281 | req->flags = 0; | |
1282 | ||
1283 | r = crypto_shash_init(req); | |
1284 | if (unlikely(r < 0)) { | |
1285 | dm_integrity_io_error(ic, "crypto_shash_init", r); | |
1286 | goto failed; | |
1287 | } | |
1288 | ||
1289 | r = crypto_shash_update(req, (const __u8 *)§or_le, sizeof sector_le); | |
1290 | if (unlikely(r < 0)) { | |
1291 | dm_integrity_io_error(ic, "crypto_shash_update", r); | |
1292 | goto failed; | |
1293 | } | |
1294 | ||
9d609f85 | 1295 | r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT); |
7eada909 MP |
1296 | if (unlikely(r < 0)) { |
1297 | dm_integrity_io_error(ic, "crypto_shash_update", r); | |
1298 | goto failed; | |
1299 | } | |
1300 | ||
1301 | r = crypto_shash_final(req, result); | |
1302 | if (unlikely(r < 0)) { | |
1303 | dm_integrity_io_error(ic, "crypto_shash_final", r); | |
1304 | goto failed; | |
1305 | } | |
1306 | ||
1307 | digest_size = crypto_shash_digestsize(ic->internal_hash); | |
1308 | if (unlikely(digest_size < ic->tag_size)) | |
1309 | memset(result + digest_size, 0, ic->tag_size - digest_size); | |
1310 | ||
1311 | return; | |
1312 | ||
1313 | failed: | |
1314 | /* this shouldn't happen anyway, the hash functions have no reason to fail */ | |
1315 | get_random_bytes(result, ic->tag_size); | |
1316 | } | |
1317 | ||
1318 | static void integrity_metadata(struct work_struct *w) | |
1319 | { | |
1320 | struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work); | |
1321 | struct dm_integrity_c *ic = dio->ic; | |
1322 | ||
1323 | int r; | |
1324 | ||
1325 | if (ic->internal_hash) { | |
1326 | struct bvec_iter iter; | |
1327 | struct bio_vec bv; | |
1328 | unsigned digest_size = crypto_shash_digestsize(ic->internal_hash); | |
1329 | struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); | |
1330 | char *checksums; | |
56b67a4f | 1331 | unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0; |
6d39a124 | 1332 | char checksums_onstack[HASH_MAX_DIGESTSIZE]; |
7eada909 MP |
1333 | unsigned sectors_to_process = dio->range.n_sectors; |
1334 | sector_t sector = dio->range.logical_sector; | |
1335 | ||
c2bcb2b7 MP |
1336 | if (unlikely(ic->mode == 'R')) |
1337 | goto skip_io; | |
1338 | ||
9d609f85 | 1339 | checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space, |
7eada909 | 1340 | GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN); |
6d39a124 | 1341 | if (!checksums) { |
7eada909 | 1342 | checksums = checksums_onstack; |
6d39a124 KC |
1343 | if (WARN_ON(extra_space && |
1344 | digest_size > sizeof(checksums_onstack))) { | |
1345 | r = -EINVAL; | |
1346 | goto error; | |
1347 | } | |
1348 | } | |
7eada909 MP |
1349 | |
1350 | __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) { | |
1351 | unsigned pos; | |
1352 | char *mem, *checksums_ptr; | |
1353 | ||
1354 | again: | |
1355 | mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset; | |
1356 | pos = 0; | |
1357 | checksums_ptr = checksums; | |
1358 | do { | |
1359 | integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr); | |
1360 | checksums_ptr += ic->tag_size; | |
9d609f85 MP |
1361 | sectors_to_process -= ic->sectors_per_block; |
1362 | pos += ic->sectors_per_block << SECTOR_SHIFT; | |
1363 | sector += ic->sectors_per_block; | |
7eada909 MP |
1364 | } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack); |
1365 | kunmap_atomic(mem); | |
1366 | ||
1367 | r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset, | |
1368 | checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE); | |
1369 | if (unlikely(r)) { | |
1370 | if (r > 0) { | |
1371 | DMERR("Checksum failed at sector 0x%llx", | |
1372 | (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size))); | |
1373 | r = -EILSEQ; | |
3f2e5393 | 1374 | atomic64_inc(&ic->number_of_mismatches); |
7eada909 MP |
1375 | } |
1376 | if (likely(checksums != checksums_onstack)) | |
1377 | kfree(checksums); | |
1378 | goto error; | |
1379 | } | |
1380 | ||
1381 | if (!sectors_to_process) | |
1382 | break; | |
1383 | ||
1384 | if (unlikely(pos < bv.bv_len)) { | |
1385 | bv.bv_offset += pos; | |
1386 | bv.bv_len -= pos; | |
1387 | goto again; | |
1388 | } | |
1389 | } | |
1390 | ||
1391 | if (likely(checksums != checksums_onstack)) | |
1392 | kfree(checksums); | |
1393 | } else { | |
1394 | struct bio_integrity_payload *bip = dio->orig_bi_integrity; | |
1395 | ||
1396 | if (bip) { | |
1397 | struct bio_vec biv; | |
1398 | struct bvec_iter iter; | |
9d609f85 MP |
1399 | unsigned data_to_process = dio->range.n_sectors; |
1400 | sector_to_block(ic, data_to_process); | |
1401 | data_to_process *= ic->tag_size; | |
7eada909 MP |
1402 | |
1403 | bip_for_each_vec(biv, bip, iter) { | |
1404 | unsigned char *tag; | |
1405 | unsigned this_len; | |
1406 | ||
1407 | BUG_ON(PageHighMem(biv.bv_page)); | |
1408 | tag = lowmem_page_address(biv.bv_page) + biv.bv_offset; | |
1409 | this_len = min(biv.bv_len, data_to_process); | |
1410 | r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset, | |
1411 | this_len, !dio->write ? TAG_READ : TAG_WRITE); | |
1412 | if (unlikely(r)) | |
1413 | goto error; | |
1414 | data_to_process -= this_len; | |
1415 | if (!data_to_process) | |
1416 | break; | |
1417 | } | |
1418 | } | |
1419 | } | |
c2bcb2b7 | 1420 | skip_io: |
7eada909 MP |
1421 | dec_in_flight(dio); |
1422 | return; | |
1423 | error: | |
4e4cbee9 | 1424 | dio->bi_status = errno_to_blk_status(r); |
7eada909 MP |
1425 | dec_in_flight(dio); |
1426 | } | |
1427 | ||
1428 | static int dm_integrity_map(struct dm_target *ti, struct bio *bio) | |
1429 | { | |
1430 | struct dm_integrity_c *ic = ti->private; | |
1431 | struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); | |
9d609f85 | 1432 | struct bio_integrity_payload *bip; |
7eada909 MP |
1433 | |
1434 | sector_t area, offset; | |
1435 | ||
1436 | dio->ic = ic; | |
4e4cbee9 | 1437 | dio->bi_status = 0; |
7eada909 MP |
1438 | |
1439 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { | |
1440 | submit_flush_bio(ic, dio); | |
1441 | return DM_MAPIO_SUBMITTED; | |
1442 | } | |
1443 | ||
1444 | dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector); | |
1445 | dio->write = bio_op(bio) == REQ_OP_WRITE; | |
1446 | dio->fua = dio->write && bio->bi_opf & REQ_FUA; | |
1447 | if (unlikely(dio->fua)) { | |
1448 | /* | |
1449 | * Don't pass down the FUA flag because we have to flush | |
1450 | * disk cache anyway. | |
1451 | */ | |
1452 | bio->bi_opf &= ~REQ_FUA; | |
1453 | } | |
1454 | if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) { | |
1455 | DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx", | |
1456 | (unsigned long long)dio->range.logical_sector, bio_sectors(bio), | |
1457 | (unsigned long long)ic->provided_data_sectors); | |
846785e6 | 1458 | return DM_MAPIO_KILL; |
7eada909 | 1459 | } |
9d609f85 MP |
1460 | if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) { |
1461 | DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x", | |
1462 | ic->sectors_per_block, | |
1463 | (unsigned long long)dio->range.logical_sector, bio_sectors(bio)); | |
846785e6 | 1464 | return DM_MAPIO_KILL; |
9d609f85 MP |
1465 | } |
1466 | ||
1467 | if (ic->sectors_per_block > 1) { | |
1468 | struct bvec_iter iter; | |
1469 | struct bio_vec bv; | |
1470 | bio_for_each_segment(bv, bio, iter) { | |
95b1369a | 1471 | if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) { |
9d609f85 MP |
1472 | DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary", |
1473 | bv.bv_offset, bv.bv_len, ic->sectors_per_block); | |
846785e6 | 1474 | return DM_MAPIO_KILL; |
9d609f85 MP |
1475 | } |
1476 | } | |
1477 | } | |
1478 | ||
1479 | bip = bio_integrity(bio); | |
1480 | if (!ic->internal_hash) { | |
1481 | if (bip) { | |
1482 | unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block; | |
1483 | if (ic->log2_tag_size >= 0) | |
1484 | wanted_tag_size <<= ic->log2_tag_size; | |
1485 | else | |
1486 | wanted_tag_size *= ic->tag_size; | |
1487 | if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) { | |
1488 | DMERR("Invalid integrity data size %u, expected %u", bip->bip_iter.bi_size, wanted_tag_size); | |
846785e6 | 1489 | return DM_MAPIO_KILL; |
9d609f85 MP |
1490 | } |
1491 | } | |
1492 | } else { | |
1493 | if (unlikely(bip != NULL)) { | |
1494 | DMERR("Unexpected integrity data when using internal hash"); | |
846785e6 | 1495 | return DM_MAPIO_KILL; |
9d609f85 MP |
1496 | } |
1497 | } | |
7eada909 | 1498 | |
c2bcb2b7 | 1499 | if (unlikely(ic->mode == 'R') && unlikely(dio->write)) |
846785e6 | 1500 | return DM_MAPIO_KILL; |
c2bcb2b7 | 1501 | |
7eada909 MP |
1502 | get_area_and_offset(ic, dio->range.logical_sector, &area, &offset); |
1503 | dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset); | |
1504 | bio->bi_iter.bi_sector = get_data_sector(ic, area, offset); | |
1505 | ||
1506 | dm_integrity_map_continue(dio, true); | |
1507 | return DM_MAPIO_SUBMITTED; | |
1508 | } | |
1509 | ||
1510 | static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio, | |
1511 | unsigned journal_section, unsigned journal_entry) | |
1512 | { | |
1513 | struct dm_integrity_c *ic = dio->ic; | |
1514 | sector_t logical_sector; | |
1515 | unsigned n_sectors; | |
1516 | ||
1517 | logical_sector = dio->range.logical_sector; | |
1518 | n_sectors = dio->range.n_sectors; | |
1519 | do { | |
1520 | struct bio_vec bv = bio_iovec(bio); | |
1521 | char *mem; | |
1522 | ||
1523 | if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors)) | |
1524 | bv.bv_len = n_sectors << SECTOR_SHIFT; | |
1525 | n_sectors -= bv.bv_len >> SECTOR_SHIFT; | |
1526 | bio_advance_iter(bio, &bio->bi_iter, bv.bv_len); | |
1527 | retry_kmap: | |
1528 | mem = kmap_atomic(bv.bv_page); | |
1529 | if (likely(dio->write)) | |
1530 | flush_dcache_page(bv.bv_page); | |
1531 | ||
1532 | do { | |
1533 | struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry); | |
1534 | ||
1535 | if (unlikely(!dio->write)) { | |
1536 | struct journal_sector *js; | |
9d609f85 MP |
1537 | char *mem_ptr; |
1538 | unsigned s; | |
7eada909 MP |
1539 | |
1540 | if (unlikely(journal_entry_is_inprogress(je))) { | |
1541 | flush_dcache_page(bv.bv_page); | |
1542 | kunmap_atomic(mem); | |
1543 | ||
1544 | __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je)); | |
1545 | goto retry_kmap; | |
1546 | } | |
1547 | smp_rmb(); | |
1548 | BUG_ON(journal_entry_get_sector(je) != logical_sector); | |
1549 | js = access_journal_data(ic, journal_section, journal_entry); | |
9d609f85 MP |
1550 | mem_ptr = mem + bv.bv_offset; |
1551 | s = 0; | |
1552 | do { | |
1553 | memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA); | |
1554 | *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s]; | |
1555 | js++; | |
1556 | mem_ptr += 1 << SECTOR_SHIFT; | |
1557 | } while (++s < ic->sectors_per_block); | |
7eada909 MP |
1558 | #ifdef INTERNAL_VERIFY |
1559 | if (ic->internal_hash) { | |
6d39a124 | 1560 | char checksums_onstack[max(HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; |
7eada909 MP |
1561 | |
1562 | integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack); | |
9d609f85 | 1563 | if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) { |
7eada909 MP |
1564 | DMERR("Checksum failed when reading from journal, at sector 0x%llx", |
1565 | (unsigned long long)logical_sector); | |
1566 | } | |
1567 | } | |
1568 | #endif | |
1569 | } | |
1570 | ||
1571 | if (!ic->internal_hash) { | |
1572 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1573 | unsigned tag_todo = ic->tag_size; | |
9d609f85 | 1574 | char *tag_ptr = journal_entry_tag(ic, je); |
7eada909 MP |
1575 | |
1576 | if (bip) do { | |
1577 | struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); | |
1578 | unsigned tag_now = min(biv.bv_len, tag_todo); | |
1579 | char *tag_addr; | |
1580 | BUG_ON(PageHighMem(biv.bv_page)); | |
1581 | tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset; | |
1582 | if (likely(dio->write)) | |
1583 | memcpy(tag_ptr, tag_addr, tag_now); | |
1584 | else | |
1585 | memcpy(tag_addr, tag_ptr, tag_now); | |
1586 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now); | |
1587 | tag_ptr += tag_now; | |
1588 | tag_todo -= tag_now; | |
1589 | } while (unlikely(tag_todo)); else { | |
1590 | if (likely(dio->write)) | |
1591 | memset(tag_ptr, 0, tag_todo); | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | if (likely(dio->write)) { | |
1596 | struct journal_sector *js; | |
9d609f85 | 1597 | unsigned s; |
7eada909 MP |
1598 | |
1599 | js = access_journal_data(ic, journal_section, journal_entry); | |
9d609f85 MP |
1600 | memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT); |
1601 | ||
1602 | s = 0; | |
1603 | do { | |
1604 | je->last_bytes[s] = js[s].commit_id; | |
1605 | } while (++s < ic->sectors_per_block); | |
7eada909 MP |
1606 | |
1607 | if (ic->internal_hash) { | |
1608 | unsigned digest_size = crypto_shash_digestsize(ic->internal_hash); | |
1609 | if (unlikely(digest_size > ic->tag_size)) { | |
6d39a124 | 1610 | char checksums_onstack[HASH_MAX_DIGESTSIZE]; |
7eada909 | 1611 | integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack); |
9d609f85 | 1612 | memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size); |
7eada909 | 1613 | } else |
9d609f85 | 1614 | integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je)); |
7eada909 MP |
1615 | } |
1616 | ||
1617 | journal_entry_set_sector(je, logical_sector); | |
1618 | } | |
9d609f85 | 1619 | logical_sector += ic->sectors_per_block; |
7eada909 MP |
1620 | |
1621 | journal_entry++; | |
1622 | if (unlikely(journal_entry == ic->journal_section_entries)) { | |
1623 | journal_entry = 0; | |
1624 | journal_section++; | |
1625 | wraparound_section(ic, &journal_section); | |
1626 | } | |
1627 | ||
9d609f85 MP |
1628 | bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT; |
1629 | } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT); | |
7eada909 MP |
1630 | |
1631 | if (unlikely(!dio->write)) | |
1632 | flush_dcache_page(bv.bv_page); | |
1633 | kunmap_atomic(mem); | |
1634 | } while (n_sectors); | |
1635 | ||
1636 | if (likely(dio->write)) { | |
1637 | smp_mb(); | |
1638 | if (unlikely(waitqueue_active(&ic->copy_to_journal_wait))) | |
1639 | wake_up(&ic->copy_to_journal_wait); | |
d3e632f0 | 1640 | if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) { |
7eada909 MP |
1641 | queue_work(ic->commit_wq, &ic->commit_work); |
1642 | } else { | |
1643 | schedule_autocommit(ic); | |
1644 | } | |
1645 | } else { | |
1646 | remove_range(ic, &dio->range); | |
1647 | } | |
1648 | ||
1649 | if (unlikely(bio->bi_iter.bi_size)) { | |
1650 | sector_t area, offset; | |
1651 | ||
1652 | dio->range.logical_sector = logical_sector; | |
1653 | get_area_and_offset(ic, dio->range.logical_sector, &area, &offset); | |
1654 | dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset); | |
1655 | return true; | |
1656 | } | |
1657 | ||
1658 | return false; | |
1659 | } | |
1660 | ||
1661 | static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map) | |
1662 | { | |
1663 | struct dm_integrity_c *ic = dio->ic; | |
1664 | struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); | |
1665 | unsigned journal_section, journal_entry; | |
1666 | unsigned journal_read_pos; | |
1667 | struct completion read_comp; | |
1668 | bool need_sync_io = ic->internal_hash && !dio->write; | |
1669 | ||
1670 | if (need_sync_io && from_map) { | |
1671 | INIT_WORK(&dio->work, integrity_bio_wait); | |
1672 | queue_work(ic->metadata_wq, &dio->work); | |
1673 | return; | |
1674 | } | |
1675 | ||
1676 | lock_retry: | |
1677 | spin_lock_irq(&ic->endio_wait.lock); | |
1678 | retry: | |
1679 | if (unlikely(dm_integrity_failed(ic))) { | |
1680 | spin_unlock_irq(&ic->endio_wait.lock); | |
1681 | do_endio(ic, bio); | |
1682 | return; | |
1683 | } | |
1684 | dio->range.n_sectors = bio_sectors(bio); | |
1685 | journal_read_pos = NOT_FOUND; | |
1686 | if (likely(ic->mode == 'J')) { | |
1687 | if (dio->write) { | |
1688 | unsigned next_entry, i, pos; | |
9dd59727 | 1689 | unsigned ws, we, range_sectors; |
7eada909 | 1690 | |
9dd59727 MP |
1691 | dio->range.n_sectors = min(dio->range.n_sectors, |
1692 | ic->free_sectors << ic->sb->log2_sectors_per_block); | |
518748b1 MP |
1693 | if (unlikely(!dio->range.n_sectors)) { |
1694 | if (from_map) | |
1695 | goto offload_to_thread; | |
1696 | sleep_on_endio_wait(ic); | |
1697 | goto retry; | |
1698 | } | |
9dd59727 MP |
1699 | range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block; |
1700 | ic->free_sectors -= range_sectors; | |
7eada909 MP |
1701 | journal_section = ic->free_section; |
1702 | journal_entry = ic->free_section_entry; | |
1703 | ||
9dd59727 | 1704 | next_entry = ic->free_section_entry + range_sectors; |
7eada909 MP |
1705 | ic->free_section_entry = next_entry % ic->journal_section_entries; |
1706 | ic->free_section += next_entry / ic->journal_section_entries; | |
1707 | ic->n_uncommitted_sections += next_entry / ic->journal_section_entries; | |
1708 | wraparound_section(ic, &ic->free_section); | |
1709 | ||
1710 | pos = journal_section * ic->journal_section_entries + journal_entry; | |
1711 | ws = journal_section; | |
1712 | we = journal_entry; | |
9d609f85 MP |
1713 | i = 0; |
1714 | do { | |
7eada909 MP |
1715 | struct journal_entry *je; |
1716 | ||
1717 | add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i); | |
1718 | pos++; | |
1719 | if (unlikely(pos >= ic->journal_entries)) | |
1720 | pos = 0; | |
1721 | ||
1722 | je = access_journal_entry(ic, ws, we); | |
1723 | BUG_ON(!journal_entry_is_unused(je)); | |
1724 | journal_entry_set_inprogress(je); | |
1725 | we++; | |
1726 | if (unlikely(we == ic->journal_section_entries)) { | |
1727 | we = 0; | |
1728 | ws++; | |
1729 | wraparound_section(ic, &ws); | |
1730 | } | |
9d609f85 | 1731 | } while ((i += ic->sectors_per_block) < dio->range.n_sectors); |
7eada909 MP |
1732 | |
1733 | spin_unlock_irq(&ic->endio_wait.lock); | |
1734 | goto journal_read_write; | |
1735 | } else { | |
1736 | sector_t next_sector; | |
1737 | journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector); | |
1738 | if (likely(journal_read_pos == NOT_FOUND)) { | |
1739 | if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector)) | |
1740 | dio->range.n_sectors = next_sector - dio->range.logical_sector; | |
1741 | } else { | |
1742 | unsigned i; | |
9d609f85 MP |
1743 | unsigned jp = journal_read_pos + 1; |
1744 | for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) { | |
1745 | if (!test_journal_node(ic, jp, dio->range.logical_sector + i)) | |
7eada909 MP |
1746 | break; |
1747 | } | |
1748 | dio->range.n_sectors = i; | |
1749 | } | |
1750 | } | |
1751 | } | |
724376a0 | 1752 | if (unlikely(!add_new_range(ic, &dio->range, true))) { |
7eada909 MP |
1753 | /* |
1754 | * We must not sleep in the request routine because it could | |
1755 | * stall bios on current->bio_list. | |
1756 | * So, we offload the bio to a workqueue if we have to sleep. | |
1757 | */ | |
7eada909 | 1758 | if (from_map) { |
518748b1 | 1759 | offload_to_thread: |
7eada909 MP |
1760 | spin_unlock_irq(&ic->endio_wait.lock); |
1761 | INIT_WORK(&dio->work, integrity_bio_wait); | |
1762 | queue_work(ic->wait_wq, &dio->work); | |
1763 | return; | |
7eada909 | 1764 | } |
724376a0 | 1765 | wait_and_add_new_range(ic, &dio->range); |
7eada909 MP |
1766 | } |
1767 | spin_unlock_irq(&ic->endio_wait.lock); | |
1768 | ||
1769 | if (unlikely(journal_read_pos != NOT_FOUND)) { | |
1770 | journal_section = journal_read_pos / ic->journal_section_entries; | |
1771 | journal_entry = journal_read_pos % ic->journal_section_entries; | |
1772 | goto journal_read_write; | |
1773 | } | |
1774 | ||
1775 | dio->in_flight = (atomic_t)ATOMIC_INIT(2); | |
1776 | ||
1777 | if (need_sync_io) { | |
b5e8ad92 | 1778 | init_completion(&read_comp); |
7eada909 MP |
1779 | dio->completion = &read_comp; |
1780 | } else | |
1781 | dio->completion = NULL; | |
1782 | ||
1783 | dio->orig_bi_iter = bio->bi_iter; | |
1784 | ||
74d46992 CH |
1785 | dio->orig_bi_disk = bio->bi_disk; |
1786 | dio->orig_bi_partno = bio->bi_partno; | |
1787 | bio_set_dev(bio, ic->dev->bdev); | |
7eada909 MP |
1788 | |
1789 | dio->orig_bi_integrity = bio_integrity(bio); | |
1790 | bio->bi_integrity = NULL; | |
1791 | bio->bi_opf &= ~REQ_INTEGRITY; | |
1792 | ||
1793 | dio->orig_bi_end_io = bio->bi_end_io; | |
1794 | bio->bi_end_io = integrity_end_io; | |
1795 | ||
1796 | bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT; | |
7eada909 MP |
1797 | generic_make_request(bio); |
1798 | ||
1799 | if (need_sync_io) { | |
1800 | wait_for_completion_io(&read_comp); | |
a3fcf725 MP |
1801 | if (unlikely(ic->recalc_wq != NULL) && |
1802 | ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) && | |
1803 | dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector)) | |
1804 | goto skip_check; | |
b7e326f7 HL |
1805 | if (likely(!bio->bi_status)) |
1806 | integrity_metadata(&dio->work); | |
1807 | else | |
a3fcf725 | 1808 | skip_check: |
b7e326f7 HL |
1809 | dec_in_flight(dio); |
1810 | ||
7eada909 MP |
1811 | } else { |
1812 | INIT_WORK(&dio->work, integrity_metadata); | |
1813 | queue_work(ic->metadata_wq, &dio->work); | |
1814 | } | |
1815 | ||
1816 | return; | |
1817 | ||
1818 | journal_read_write: | |
1819 | if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry))) | |
1820 | goto lock_retry; | |
1821 | ||
1822 | do_endio_flush(ic, dio); | |
1823 | } | |
1824 | ||
1825 | ||
1826 | static void integrity_bio_wait(struct work_struct *w) | |
1827 | { | |
1828 | struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work); | |
1829 | ||
1830 | dm_integrity_map_continue(dio, false); | |
1831 | } | |
1832 | ||
1833 | static void pad_uncommitted(struct dm_integrity_c *ic) | |
1834 | { | |
1835 | if (ic->free_section_entry) { | |
1836 | ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry; | |
1837 | ic->free_section_entry = 0; | |
1838 | ic->free_section++; | |
1839 | wraparound_section(ic, &ic->free_section); | |
1840 | ic->n_uncommitted_sections++; | |
1841 | } | |
aa03a91f MP |
1842 | WARN_ON(ic->journal_sections * ic->journal_section_entries != |
1843 | (ic->n_uncommitted_sections + ic->n_committed_sections) * ic->journal_section_entries + ic->free_sectors); | |
7eada909 MP |
1844 | } |
1845 | ||
1846 | static void integrity_commit(struct work_struct *w) | |
1847 | { | |
1848 | struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work); | |
1849 | unsigned commit_start, commit_sections; | |
1850 | unsigned i, j, n; | |
1851 | struct bio *flushes; | |
1852 | ||
1853 | del_timer(&ic->autocommit_timer); | |
1854 | ||
1855 | spin_lock_irq(&ic->endio_wait.lock); | |
1856 | flushes = bio_list_get(&ic->flush_bio_list); | |
1857 | if (unlikely(ic->mode != 'J')) { | |
1858 | spin_unlock_irq(&ic->endio_wait.lock); | |
1859 | dm_integrity_flush_buffers(ic); | |
1860 | goto release_flush_bios; | |
1861 | } | |
1862 | ||
1863 | pad_uncommitted(ic); | |
1864 | commit_start = ic->uncommitted_section; | |
1865 | commit_sections = ic->n_uncommitted_sections; | |
1866 | spin_unlock_irq(&ic->endio_wait.lock); | |
1867 | ||
1868 | if (!commit_sections) | |
1869 | goto release_flush_bios; | |
1870 | ||
1871 | i = commit_start; | |
1872 | for (n = 0; n < commit_sections; n++) { | |
1873 | for (j = 0; j < ic->journal_section_entries; j++) { | |
1874 | struct journal_entry *je; | |
1875 | je = access_journal_entry(ic, i, j); | |
1876 | io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je)); | |
1877 | } | |
1878 | for (j = 0; j < ic->journal_section_sectors; j++) { | |
1879 | struct journal_sector *js; | |
1880 | js = access_journal(ic, i, j); | |
1881 | js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq); | |
1882 | } | |
1883 | i++; | |
1884 | if (unlikely(i >= ic->journal_sections)) | |
1885 | ic->commit_seq = next_commit_seq(ic->commit_seq); | |
1886 | wraparound_section(ic, &i); | |
1887 | } | |
1888 | smp_rmb(); | |
1889 | ||
1890 | write_journal(ic, commit_start, commit_sections); | |
1891 | ||
1892 | spin_lock_irq(&ic->endio_wait.lock); | |
1893 | ic->uncommitted_section += commit_sections; | |
1894 | wraparound_section(ic, &ic->uncommitted_section); | |
1895 | ic->n_uncommitted_sections -= commit_sections; | |
1896 | ic->n_committed_sections += commit_sections; | |
1897 | spin_unlock_irq(&ic->endio_wait.lock); | |
1898 | ||
d3e632f0 | 1899 | if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) |
7eada909 MP |
1900 | queue_work(ic->writer_wq, &ic->writer_work); |
1901 | ||
1902 | release_flush_bios: | |
1903 | while (flushes) { | |
1904 | struct bio *next = flushes->bi_next; | |
1905 | flushes->bi_next = NULL; | |
1906 | do_endio(ic, flushes); | |
1907 | flushes = next; | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | static void complete_copy_from_journal(unsigned long error, void *context) | |
1912 | { | |
1913 | struct journal_io *io = context; | |
1914 | struct journal_completion *comp = io->comp; | |
1915 | struct dm_integrity_c *ic = comp->ic; | |
1916 | remove_range(ic, &io->range); | |
6f1c819c | 1917 | mempool_free(io, &ic->journal_io_mempool); |
7eada909 MP |
1918 | if (unlikely(error != 0)) |
1919 | dm_integrity_io_error(ic, "copying from journal", -EIO); | |
1920 | complete_journal_op(comp); | |
1921 | } | |
1922 | ||
9d609f85 MP |
1923 | static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js, |
1924 | struct journal_entry *je) | |
1925 | { | |
1926 | unsigned s = 0; | |
1927 | do { | |
1928 | js->commit_id = je->last_bytes[s]; | |
1929 | js++; | |
1930 | } while (++s < ic->sectors_per_block); | |
1931 | } | |
1932 | ||
7eada909 MP |
1933 | static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start, |
1934 | unsigned write_sections, bool from_replay) | |
1935 | { | |
1936 | unsigned i, j, n; | |
1937 | struct journal_completion comp; | |
a7c3e62b MP |
1938 | struct blk_plug plug; |
1939 | ||
1940 | blk_start_plug(&plug); | |
7eada909 MP |
1941 | |
1942 | comp.ic = ic; | |
1943 | comp.in_flight = (atomic_t)ATOMIC_INIT(1); | |
b5e8ad92 | 1944 | init_completion(&comp.comp); |
7eada909 MP |
1945 | |
1946 | i = write_start; | |
1947 | for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) { | |
1948 | #ifndef INTERNAL_VERIFY | |
1949 | if (unlikely(from_replay)) | |
1950 | #endif | |
1951 | rw_section_mac(ic, i, false); | |
1952 | for (j = 0; j < ic->journal_section_entries; j++) { | |
1953 | struct journal_entry *je = access_journal_entry(ic, i, j); | |
1954 | sector_t sec, area, offset; | |
1955 | unsigned k, l, next_loop; | |
1956 | sector_t metadata_block; | |
1957 | unsigned metadata_offset; | |
1958 | struct journal_io *io; | |
1959 | ||
1960 | if (journal_entry_is_unused(je)) | |
1961 | continue; | |
1962 | BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay); | |
1963 | sec = journal_entry_get_sector(je); | |
9d609f85 MP |
1964 | if (unlikely(from_replay)) { |
1965 | if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) { | |
1966 | dm_integrity_io_error(ic, "invalid sector in journal", -EIO); | |
1967 | sec &= ~(sector_t)(ic->sectors_per_block - 1); | |
1968 | } | |
1969 | } | |
7eada909 | 1970 | get_area_and_offset(ic, sec, &area, &offset); |
9d609f85 | 1971 | restore_last_bytes(ic, access_journal_data(ic, i, j), je); |
7eada909 MP |
1972 | for (k = j + 1; k < ic->journal_section_entries; k++) { |
1973 | struct journal_entry *je2 = access_journal_entry(ic, i, k); | |
1974 | sector_t sec2, area2, offset2; | |
1975 | if (journal_entry_is_unused(je2)) | |
1976 | break; | |
1977 | BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay); | |
1978 | sec2 = journal_entry_get_sector(je2); | |
1979 | get_area_and_offset(ic, sec2, &area2, &offset2); | |
9d609f85 | 1980 | if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block)) |
7eada909 | 1981 | break; |
9d609f85 | 1982 | restore_last_bytes(ic, access_journal_data(ic, i, k), je2); |
7eada909 MP |
1983 | } |
1984 | next_loop = k - 1; | |
1985 | ||
6f1c819c | 1986 | io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO); |
7eada909 MP |
1987 | io->comp = ∁ |
1988 | io->range.logical_sector = sec; | |
9d609f85 | 1989 | io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block; |
7eada909 MP |
1990 | |
1991 | spin_lock_irq(&ic->endio_wait.lock); | |
724376a0 MP |
1992 | if (unlikely(!add_new_range(ic, &io->range, true))) |
1993 | wait_and_add_new_range(ic, &io->range); | |
7eada909 MP |
1994 | |
1995 | if (likely(!from_replay)) { | |
1996 | struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries]; | |
1997 | ||
1998 | /* don't write if there is newer committed sector */ | |
1999 | while (j < k && find_newer_committed_node(ic, §ion_node[j])) { | |
2000 | struct journal_entry *je2 = access_journal_entry(ic, i, j); | |
2001 | ||
2002 | journal_entry_set_unused(je2); | |
2003 | remove_journal_node(ic, §ion_node[j]); | |
2004 | j++; | |
9d609f85 MP |
2005 | sec += ic->sectors_per_block; |
2006 | offset += ic->sectors_per_block; | |
7eada909 MP |
2007 | } |
2008 | while (j < k && find_newer_committed_node(ic, §ion_node[k - 1])) { | |
2009 | struct journal_entry *je2 = access_journal_entry(ic, i, k - 1); | |
2010 | ||
2011 | journal_entry_set_unused(je2); | |
2012 | remove_journal_node(ic, §ion_node[k - 1]); | |
2013 | k--; | |
2014 | } | |
2015 | if (j == k) { | |
2016 | remove_range_unlocked(ic, &io->range); | |
2017 | spin_unlock_irq(&ic->endio_wait.lock); | |
6f1c819c | 2018 | mempool_free(io, &ic->journal_io_mempool); |
7eada909 MP |
2019 | goto skip_io; |
2020 | } | |
2021 | for (l = j; l < k; l++) { | |
2022 | remove_journal_node(ic, §ion_node[l]); | |
2023 | } | |
2024 | } | |
2025 | spin_unlock_irq(&ic->endio_wait.lock); | |
2026 | ||
2027 | metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset); | |
2028 | for (l = j; l < k; l++) { | |
2029 | int r; | |
2030 | struct journal_entry *je2 = access_journal_entry(ic, i, l); | |
2031 | ||
2032 | if ( | |
2033 | #ifndef INTERNAL_VERIFY | |
2034 | unlikely(from_replay) && | |
2035 | #endif | |
2036 | ic->internal_hash) { | |
6d39a124 | 2037 | char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; |
7eada909 | 2038 | |
9d609f85 | 2039 | integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block), |
7eada909 | 2040 | (char *)access_journal_data(ic, i, l), test_tag); |
9d609f85 | 2041 | if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) |
7eada909 MP |
2042 | dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ); |
2043 | } | |
2044 | ||
2045 | journal_entry_set_unused(je2); | |
9d609f85 | 2046 | r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset, |
7eada909 MP |
2047 | ic->tag_size, TAG_WRITE); |
2048 | if (unlikely(r)) { | |
2049 | dm_integrity_io_error(ic, "reading tags", r); | |
2050 | } | |
2051 | } | |
2052 | ||
2053 | atomic_inc(&comp.in_flight); | |
9d609f85 MP |
2054 | copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block, |
2055 | (k - j) << ic->sb->log2_sectors_per_block, | |
2056 | get_data_sector(ic, area, offset), | |
7eada909 MP |
2057 | complete_copy_from_journal, io); |
2058 | skip_io: | |
2059 | j = next_loop; | |
2060 | } | |
2061 | } | |
2062 | ||
2063 | dm_bufio_write_dirty_buffers_async(ic->bufio); | |
2064 | ||
a7c3e62b MP |
2065 | blk_finish_plug(&plug); |
2066 | ||
7eada909 MP |
2067 | complete_journal_op(&comp); |
2068 | wait_for_completion_io(&comp.comp); | |
2069 | ||
2070 | dm_integrity_flush_buffers(ic); | |
2071 | } | |
2072 | ||
2073 | static void integrity_writer(struct work_struct *w) | |
2074 | { | |
2075 | struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work); | |
2076 | unsigned write_start, write_sections; | |
2077 | ||
2078 | unsigned prev_free_sectors; | |
2079 | ||
2080 | /* the following test is not needed, but it tests the replay code */ | |
747829a8 | 2081 | if (READ_ONCE(ic->suspending) && !ic->meta_dev) |
7eada909 MP |
2082 | return; |
2083 | ||
2084 | spin_lock_irq(&ic->endio_wait.lock); | |
2085 | write_start = ic->committed_section; | |
2086 | write_sections = ic->n_committed_sections; | |
2087 | spin_unlock_irq(&ic->endio_wait.lock); | |
2088 | ||
2089 | if (!write_sections) | |
2090 | return; | |
2091 | ||
2092 | do_journal_write(ic, write_start, write_sections, false); | |
2093 | ||
2094 | spin_lock_irq(&ic->endio_wait.lock); | |
2095 | ||
2096 | ic->committed_section += write_sections; | |
2097 | wraparound_section(ic, &ic->committed_section); | |
2098 | ic->n_committed_sections -= write_sections; | |
2099 | ||
2100 | prev_free_sectors = ic->free_sectors; | |
2101 | ic->free_sectors += write_sections * ic->journal_section_entries; | |
2102 | if (unlikely(!prev_free_sectors)) | |
2103 | wake_up_locked(&ic->endio_wait); | |
2104 | ||
2105 | spin_unlock_irq(&ic->endio_wait.lock); | |
2106 | } | |
2107 | ||
a3fcf725 MP |
2108 | static void recalc_write_super(struct dm_integrity_c *ic) |
2109 | { | |
2110 | int r; | |
2111 | ||
2112 | dm_integrity_flush_buffers(ic); | |
2113 | if (dm_integrity_failed(ic)) | |
2114 | return; | |
2115 | ||
2116 | sb_set_version(ic); | |
2117 | r = sync_rw_sb(ic, REQ_OP_WRITE, 0); | |
2118 | if (unlikely(r)) | |
2119 | dm_integrity_io_error(ic, "writing superblock", r); | |
2120 | } | |
2121 | ||
2122 | static void integrity_recalc(struct work_struct *w) | |
2123 | { | |
2124 | struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work); | |
2125 | struct dm_integrity_range range; | |
2126 | struct dm_io_request io_req; | |
2127 | struct dm_io_region io_loc; | |
2128 | sector_t area, offset; | |
2129 | sector_t metadata_block; | |
2130 | unsigned metadata_offset; | |
2131 | __u8 *t; | |
2132 | unsigned i; | |
2133 | int r; | |
2134 | unsigned super_counter = 0; | |
2135 | ||
2136 | spin_lock_irq(&ic->endio_wait.lock); | |
2137 | ||
2138 | next_chunk: | |
2139 | ||
2140 | if (unlikely(READ_ONCE(ic->suspending))) | |
2141 | goto unlock_ret; | |
2142 | ||
2143 | range.logical_sector = le64_to_cpu(ic->sb->recalc_sector); | |
2144 | if (unlikely(range.logical_sector >= ic->provided_data_sectors)) | |
2145 | goto unlock_ret; | |
2146 | ||
2147 | get_area_and_offset(ic, range.logical_sector, &area, &offset); | |
2148 | range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector); | |
2149 | if (!ic->meta_dev) | |
2150 | range.n_sectors = min(range.n_sectors, (1U << ic->sb->log2_interleave_sectors) - (unsigned)offset); | |
2151 | ||
2152 | if (unlikely(!add_new_range(ic, &range, true))) | |
2153 | wait_and_add_new_range(ic, &range); | |
2154 | ||
2155 | spin_unlock_irq(&ic->endio_wait.lock); | |
2156 | ||
2157 | if (unlikely(++super_counter == RECALC_WRITE_SUPER)) { | |
2158 | recalc_write_super(ic); | |
2159 | super_counter = 0; | |
2160 | } | |
2161 | ||
2162 | if (unlikely(dm_integrity_failed(ic))) | |
2163 | goto err; | |
2164 | ||
2165 | io_req.bi_op = REQ_OP_READ; | |
2166 | io_req.bi_op_flags = 0; | |
2167 | io_req.mem.type = DM_IO_VMA; | |
2168 | io_req.mem.ptr.addr = ic->recalc_buffer; | |
2169 | io_req.notify.fn = NULL; | |
2170 | io_req.client = ic->io; | |
2171 | io_loc.bdev = ic->dev->bdev; | |
2172 | io_loc.sector = get_data_sector(ic, area, offset); | |
2173 | io_loc.count = range.n_sectors; | |
2174 | ||
2175 | r = dm_io(&io_req, 1, &io_loc, NULL); | |
2176 | if (unlikely(r)) { | |
2177 | dm_integrity_io_error(ic, "reading data", r); | |
2178 | goto err; | |
2179 | } | |
2180 | ||
2181 | t = ic->recalc_tags; | |
2182 | for (i = 0; i < range.n_sectors; i += ic->sectors_per_block) { | |
2183 | integrity_sector_checksum(ic, range.logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t); | |
2184 | t += ic->tag_size; | |
2185 | } | |
2186 | ||
2187 | metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset); | |
2188 | ||
2189 | r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE); | |
2190 | if (unlikely(r)) { | |
2191 | dm_integrity_io_error(ic, "writing tags", r); | |
2192 | goto err; | |
2193 | } | |
2194 | ||
2195 | spin_lock_irq(&ic->endio_wait.lock); | |
2196 | remove_range_unlocked(ic, &range); | |
2197 | ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors); | |
2198 | goto next_chunk; | |
2199 | ||
2200 | err: | |
2201 | remove_range(ic, &range); | |
2202 | return; | |
2203 | ||
2204 | unlock_ret: | |
2205 | spin_unlock_irq(&ic->endio_wait.lock); | |
2206 | ||
2207 | recalc_write_super(ic); | |
2208 | } | |
2209 | ||
7eada909 MP |
2210 | static void init_journal(struct dm_integrity_c *ic, unsigned start_section, |
2211 | unsigned n_sections, unsigned char commit_seq) | |
2212 | { | |
2213 | unsigned i, j, n; | |
2214 | ||
2215 | if (!n_sections) | |
2216 | return; | |
2217 | ||
2218 | for (n = 0; n < n_sections; n++) { | |
2219 | i = start_section + n; | |
2220 | wraparound_section(ic, &i); | |
2221 | for (j = 0; j < ic->journal_section_sectors; j++) { | |
2222 | struct journal_sector *js = access_journal(ic, i, j); | |
2223 | memset(&js->entries, 0, JOURNAL_SECTOR_DATA); | |
2224 | js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq); | |
2225 | } | |
2226 | for (j = 0; j < ic->journal_section_entries; j++) { | |
2227 | struct journal_entry *je = access_journal_entry(ic, i, j); | |
2228 | journal_entry_set_unused(je); | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | write_journal(ic, start_section, n_sections); | |
2233 | } | |
2234 | ||
2235 | static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id) | |
2236 | { | |
2237 | unsigned char k; | |
2238 | for (k = 0; k < N_COMMIT_IDS; k++) { | |
2239 | if (dm_integrity_commit_id(ic, i, j, k) == id) | |
2240 | return k; | |
2241 | } | |
2242 | dm_integrity_io_error(ic, "journal commit id", -EIO); | |
2243 | return -EIO; | |
2244 | } | |
2245 | ||
2246 | static void replay_journal(struct dm_integrity_c *ic) | |
2247 | { | |
2248 | unsigned i, j; | |
2249 | bool used_commit_ids[N_COMMIT_IDS]; | |
2250 | unsigned max_commit_id_sections[N_COMMIT_IDS]; | |
2251 | unsigned write_start, write_sections; | |
2252 | unsigned continue_section; | |
2253 | bool journal_empty; | |
2254 | unsigned char unused, last_used, want_commit_seq; | |
2255 | ||
c2bcb2b7 MP |
2256 | if (ic->mode == 'R') |
2257 | return; | |
2258 | ||
7eada909 MP |
2259 | if (ic->journal_uptodate) |
2260 | return; | |
2261 | ||
2262 | last_used = 0; | |
2263 | write_start = 0; | |
2264 | ||
2265 | if (!ic->just_formatted) { | |
2266 | DEBUG_print("reading journal\n"); | |
2267 | rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL); | |
2268 | if (ic->journal_io) | |
2269 | DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal"); | |
2270 | if (ic->journal_io) { | |
2271 | struct journal_completion crypt_comp; | |
2272 | crypt_comp.ic = ic; | |
b5e8ad92 | 2273 | init_completion(&crypt_comp.comp); |
7eada909 MP |
2274 | crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0); |
2275 | encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp); | |
2276 | wait_for_completion(&crypt_comp.comp); | |
2277 | } | |
2278 | DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal"); | |
2279 | } | |
2280 | ||
2281 | if (dm_integrity_failed(ic)) | |
2282 | goto clear_journal; | |
2283 | ||
2284 | journal_empty = true; | |
2285 | memset(used_commit_ids, 0, sizeof used_commit_ids); | |
2286 | memset(max_commit_id_sections, 0, sizeof max_commit_id_sections); | |
2287 | for (i = 0; i < ic->journal_sections; i++) { | |
2288 | for (j = 0; j < ic->journal_section_sectors; j++) { | |
2289 | int k; | |
2290 | struct journal_sector *js = access_journal(ic, i, j); | |
2291 | k = find_commit_seq(ic, i, j, js->commit_id); | |
2292 | if (k < 0) | |
2293 | goto clear_journal; | |
2294 | used_commit_ids[k] = true; | |
2295 | max_commit_id_sections[k] = i; | |
2296 | } | |
2297 | if (journal_empty) { | |
2298 | for (j = 0; j < ic->journal_section_entries; j++) { | |
2299 | struct journal_entry *je = access_journal_entry(ic, i, j); | |
2300 | if (!journal_entry_is_unused(je)) { | |
2301 | journal_empty = false; | |
2302 | break; | |
2303 | } | |
2304 | } | |
2305 | } | |
2306 | } | |
2307 | ||
2308 | if (!used_commit_ids[N_COMMIT_IDS - 1]) { | |
2309 | unused = N_COMMIT_IDS - 1; | |
2310 | while (unused && !used_commit_ids[unused - 1]) | |
2311 | unused--; | |
2312 | } else { | |
2313 | for (unused = 0; unused < N_COMMIT_IDS; unused++) | |
2314 | if (!used_commit_ids[unused]) | |
2315 | break; | |
2316 | if (unused == N_COMMIT_IDS) { | |
2317 | dm_integrity_io_error(ic, "journal commit ids", -EIO); | |
2318 | goto clear_journal; | |
2319 | } | |
2320 | } | |
2321 | DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n", | |
2322 | unused, used_commit_ids[0], used_commit_ids[1], | |
2323 | used_commit_ids[2], used_commit_ids[3]); | |
2324 | ||
2325 | last_used = prev_commit_seq(unused); | |
2326 | want_commit_seq = prev_commit_seq(last_used); | |
2327 | ||
2328 | if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)]) | |
2329 | journal_empty = true; | |
2330 | ||
2331 | write_start = max_commit_id_sections[last_used] + 1; | |
2332 | if (unlikely(write_start >= ic->journal_sections)) | |
2333 | want_commit_seq = next_commit_seq(want_commit_seq); | |
2334 | wraparound_section(ic, &write_start); | |
2335 | ||
2336 | i = write_start; | |
2337 | for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) { | |
2338 | for (j = 0; j < ic->journal_section_sectors; j++) { | |
2339 | struct journal_sector *js = access_journal(ic, i, j); | |
2340 | ||
2341 | if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) { | |
2342 | /* | |
2343 | * This could be caused by crash during writing. | |
2344 | * We won't replay the inconsistent part of the | |
2345 | * journal. | |
2346 | */ | |
2347 | DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n", | |
2348 | i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq); | |
2349 | goto brk; | |
2350 | } | |
2351 | } | |
2352 | i++; | |
2353 | if (unlikely(i >= ic->journal_sections)) | |
2354 | want_commit_seq = next_commit_seq(want_commit_seq); | |
2355 | wraparound_section(ic, &i); | |
2356 | } | |
2357 | brk: | |
2358 | ||
2359 | if (!journal_empty) { | |
2360 | DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n", | |
2361 | write_sections, write_start, want_commit_seq); | |
2362 | do_journal_write(ic, write_start, write_sections, true); | |
2363 | } | |
2364 | ||
2365 | if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) { | |
2366 | continue_section = write_start; | |
2367 | ic->commit_seq = want_commit_seq; | |
2368 | DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq); | |
2369 | } else { | |
2370 | unsigned s; | |
2371 | unsigned char erase_seq; | |
2372 | clear_journal: | |
2373 | DEBUG_print("clearing journal\n"); | |
2374 | ||
2375 | erase_seq = prev_commit_seq(prev_commit_seq(last_used)); | |
2376 | s = write_start; | |
2377 | init_journal(ic, s, 1, erase_seq); | |
2378 | s++; | |
2379 | wraparound_section(ic, &s); | |
2380 | if (ic->journal_sections >= 2) { | |
2381 | init_journal(ic, s, ic->journal_sections - 2, erase_seq); | |
2382 | s += ic->journal_sections - 2; | |
2383 | wraparound_section(ic, &s); | |
2384 | init_journal(ic, s, 1, erase_seq); | |
2385 | } | |
2386 | ||
2387 | continue_section = 0; | |
2388 | ic->commit_seq = next_commit_seq(erase_seq); | |
2389 | } | |
2390 | ||
2391 | ic->committed_section = continue_section; | |
2392 | ic->n_committed_sections = 0; | |
2393 | ||
2394 | ic->uncommitted_section = continue_section; | |
2395 | ic->n_uncommitted_sections = 0; | |
2396 | ||
2397 | ic->free_section = continue_section; | |
2398 | ic->free_section_entry = 0; | |
2399 | ic->free_sectors = ic->journal_entries; | |
2400 | ||
2401 | ic->journal_tree_root = RB_ROOT; | |
2402 | for (i = 0; i < ic->journal_entries; i++) | |
2403 | init_journal_node(&ic->journal_tree[i]); | |
2404 | } | |
2405 | ||
2406 | static void dm_integrity_postsuspend(struct dm_target *ti) | |
2407 | { | |
2408 | struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private; | |
2409 | ||
2410 | del_timer_sync(&ic->autocommit_timer); | |
2411 | ||
c21b1639 | 2412 | WRITE_ONCE(ic->suspending, 1); |
7eada909 | 2413 | |
a3fcf725 MP |
2414 | if (ic->recalc_wq) |
2415 | drain_workqueue(ic->recalc_wq); | |
2416 | ||
7eada909 MP |
2417 | queue_work(ic->commit_wq, &ic->commit_work); |
2418 | drain_workqueue(ic->commit_wq); | |
2419 | ||
2420 | if (ic->mode == 'J') { | |
747829a8 MP |
2421 | if (ic->meta_dev) |
2422 | queue_work(ic->writer_wq, &ic->writer_work); | |
7eada909 MP |
2423 | drain_workqueue(ic->writer_wq); |
2424 | dm_integrity_flush_buffers(ic); | |
2425 | } | |
2426 | ||
c21b1639 | 2427 | WRITE_ONCE(ic->suspending, 0); |
7eada909 MP |
2428 | |
2429 | BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress)); | |
2430 | ||
2431 | ic->journal_uptodate = true; | |
2432 | } | |
2433 | ||
2434 | static void dm_integrity_resume(struct dm_target *ti) | |
2435 | { | |
2436 | struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private; | |
2437 | ||
2438 | replay_journal(ic); | |
a3fcf725 MP |
2439 | |
2440 | if (ic->recalc_wq && ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) { | |
2441 | __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector); | |
2442 | if (recalc_pos < ic->provided_data_sectors) { | |
2443 | queue_work(ic->recalc_wq, &ic->recalc_work); | |
2444 | } else if (recalc_pos > ic->provided_data_sectors) { | |
2445 | ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors); | |
2446 | recalc_write_super(ic); | |
2447 | } | |
2448 | } | |
7eada909 MP |
2449 | } |
2450 | ||
2451 | static void dm_integrity_status(struct dm_target *ti, status_type_t type, | |
2452 | unsigned status_flags, char *result, unsigned maxlen) | |
2453 | { | |
2454 | struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private; | |
2455 | unsigned arg_count; | |
2456 | size_t sz = 0; | |
2457 | ||
2458 | switch (type) { | |
2459 | case STATUSTYPE_INFO: | |
f84fd2c9 MP |
2460 | DMEMIT("%llu %llu", |
2461 | (unsigned long long)atomic64_read(&ic->number_of_mismatches), | |
2462 | (unsigned long long)ic->provided_data_sectors); | |
a3fcf725 MP |
2463 | if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) |
2464 | DMEMIT(" %llu", (unsigned long long)le64_to_cpu(ic->sb->recalc_sector)); | |
2465 | else | |
2466 | DMEMIT(" -"); | |
7eada909 MP |
2467 | break; |
2468 | ||
2469 | case STATUSTYPE_TABLE: { | |
2470 | __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100; | |
2471 | watermark_percentage += ic->journal_entries / 2; | |
2472 | do_div(watermark_percentage, ic->journal_entries); | |
2473 | arg_count = 5; | |
356d9d52 | 2474 | arg_count += !!ic->meta_dev; |
9d609f85 | 2475 | arg_count += ic->sectors_per_block != 1; |
a3fcf725 | 2476 | arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)); |
7eada909 MP |
2477 | arg_count += !!ic->internal_hash_alg.alg_string; |
2478 | arg_count += !!ic->journal_crypt_alg.alg_string; | |
2479 | arg_count += !!ic->journal_mac_alg.alg_string; | |
2480 | DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start, | |
2481 | ic->tag_size, ic->mode, arg_count); | |
356d9d52 MP |
2482 | if (ic->meta_dev) |
2483 | DMEMIT(" meta_device:%s", ic->meta_dev->name); | |
a3fcf725 MP |
2484 | if (ic->sectors_per_block != 1) |
2485 | DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT); | |
2486 | if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) | |
2487 | DMEMIT(" recalculate"); | |
56b67a4f MP |
2488 | DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS); |
2489 | DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors); | |
2490 | DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors); | |
2491 | DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage); | |
2492 | DMEMIT(" commit_time:%u", ic->autocommit_msec); | |
7eada909 MP |
2493 | |
2494 | #define EMIT_ALG(a, n) \ | |
2495 | do { \ | |
2496 | if (ic->a.alg_string) { \ | |
2497 | DMEMIT(" %s:%s", n, ic->a.alg_string); \ | |
2498 | if (ic->a.key_string) \ | |
2499 | DMEMIT(":%s", ic->a.key_string);\ | |
2500 | } \ | |
2501 | } while (0) | |
56b67a4f MP |
2502 | EMIT_ALG(internal_hash_alg, "internal_hash"); |
2503 | EMIT_ALG(journal_crypt_alg, "journal_crypt"); | |
2504 | EMIT_ALG(journal_mac_alg, "journal_mac"); | |
7eada909 MP |
2505 | break; |
2506 | } | |
2507 | } | |
2508 | } | |
2509 | ||
2510 | static int dm_integrity_iterate_devices(struct dm_target *ti, | |
2511 | iterate_devices_callout_fn fn, void *data) | |
2512 | { | |
2513 | struct dm_integrity_c *ic = ti->private; | |
2514 | ||
356d9d52 MP |
2515 | if (!ic->meta_dev) |
2516 | return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data); | |
2517 | else | |
2518 | return fn(ti, ic->dev, 0, ti->len, data); | |
7eada909 MP |
2519 | } |
2520 | ||
9d609f85 MP |
2521 | static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits) |
2522 | { | |
2523 | struct dm_integrity_c *ic = ti->private; | |
2524 | ||
2525 | if (ic->sectors_per_block > 1) { | |
2526 | limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT; | |
2527 | limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT; | |
2528 | blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT); | |
2529 | } | |
2530 | } | |
2531 | ||
7eada909 MP |
2532 | static void calculate_journal_section_size(struct dm_integrity_c *ic) |
2533 | { | |
2534 | unsigned sector_space = JOURNAL_SECTOR_DATA; | |
2535 | ||
2536 | ic->journal_sections = le32_to_cpu(ic->sb->journal_sections); | |
9d609f85 | 2537 | ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size, |
7eada909 MP |
2538 | JOURNAL_ENTRY_ROUNDUP); |
2539 | ||
2540 | if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) | |
2541 | sector_space -= JOURNAL_MAC_PER_SECTOR; | |
2542 | ic->journal_entries_per_sector = sector_space / ic->journal_entry_size; | |
2543 | ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS; | |
9d609f85 | 2544 | ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS; |
7eada909 MP |
2545 | ic->journal_entries = ic->journal_section_entries * ic->journal_sections; |
2546 | } | |
2547 | ||
2548 | static int calculate_device_limits(struct dm_integrity_c *ic) | |
2549 | { | |
2550 | __u64 initial_sectors; | |
7eada909 MP |
2551 | |
2552 | calculate_journal_section_size(ic); | |
2553 | initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections; | |
356d9d52 | 2554 | if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX) |
7eada909 MP |
2555 | return -EINVAL; |
2556 | ic->initial_sectors = initial_sectors; | |
2557 | ||
356d9d52 MP |
2558 | if (!ic->meta_dev) { |
2559 | sector_t last_sector, last_area, last_offset; | |
7eada909 | 2560 | |
356d9d52 MP |
2561 | ic->metadata_run = roundup((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block), |
2562 | (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS)) >> SECTOR_SHIFT; | |
2563 | if (!(ic->metadata_run & (ic->metadata_run - 1))) | |
2564 | ic->log2_metadata_run = __ffs(ic->metadata_run); | |
2565 | else | |
2566 | ic->log2_metadata_run = -1; | |
7eada909 | 2567 | |
356d9d52 MP |
2568 | get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset); |
2569 | last_sector = get_data_sector(ic, last_area, last_offset); | |
2570 | if (last_sector < ic->start || last_sector >= ic->meta_device_sectors) | |
2571 | return -EINVAL; | |
2572 | } else { | |
2573 | __u64 meta_size = ic->provided_data_sectors * ic->tag_size; | |
2574 | meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1)) | |
2575 | >> (ic->log2_buffer_sectors + SECTOR_SHIFT); | |
2576 | meta_size <<= ic->log2_buffer_sectors; | |
2577 | if (ic->initial_sectors + meta_size < ic->initial_sectors || | |
2578 | ic->initial_sectors + meta_size > ic->meta_device_sectors) | |
2579 | return -EINVAL; | |
2580 | ic->metadata_run = 1; | |
2581 | ic->log2_metadata_run = 0; | |
2582 | } | |
7eada909 MP |
2583 | |
2584 | return 0; | |
2585 | } | |
2586 | ||
2587 | static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors) | |
2588 | { | |
2589 | unsigned journal_sections; | |
2590 | int test_bit; | |
2591 | ||
56b67a4f | 2592 | memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT); |
7eada909 | 2593 | memcpy(ic->sb->magic, SB_MAGIC, 8); |
7eada909 | 2594 | ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size); |
9d609f85 | 2595 | ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block); |
7eada909 MP |
2596 | if (ic->journal_mac_alg.alg_string) |
2597 | ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC); | |
2598 | ||
2599 | calculate_journal_section_size(ic); | |
2600 | journal_sections = journal_sectors / ic->journal_section_sectors; | |
2601 | if (!journal_sections) | |
2602 | journal_sections = 1; | |
7eada909 | 2603 | |
356d9d52 MP |
2604 | if (!ic->meta_dev) { |
2605 | ic->sb->journal_sections = cpu_to_le32(journal_sections); | |
2606 | if (!interleave_sectors) | |
2607 | interleave_sectors = DEFAULT_INTERLEAVE_SECTORS; | |
2608 | ic->sb->log2_interleave_sectors = __fls(interleave_sectors); | |
2609 | ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors); | |
2610 | ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors); | |
2611 | ||
2612 | ic->provided_data_sectors = 0; | |
2613 | for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) { | |
2614 | __u64 prev_data_sectors = ic->provided_data_sectors; | |
2615 | ||
2616 | ic->provided_data_sectors |= (sector_t)1 << test_bit; | |
2617 | if (calculate_device_limits(ic)) | |
2618 | ic->provided_data_sectors = prev_data_sectors; | |
2619 | } | |
2620 | if (!ic->provided_data_sectors) | |
2621 | return -EINVAL; | |
2622 | } else { | |
2623 | ic->sb->log2_interleave_sectors = 0; | |
2624 | ic->provided_data_sectors = ic->data_device_sectors; | |
2625 | ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1); | |
2626 | ||
2627 | try_smaller_buffer: | |
2628 | ic->sb->journal_sections = cpu_to_le32(0); | |
2629 | for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) { | |
2630 | __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections); | |
2631 | __u32 test_journal_sections = prev_journal_sections | (1U << test_bit); | |
2632 | if (test_journal_sections > journal_sections) | |
2633 | continue; | |
2634 | ic->sb->journal_sections = cpu_to_le32(test_journal_sections); | |
2635 | if (calculate_device_limits(ic)) | |
2636 | ic->sb->journal_sections = cpu_to_le32(prev_journal_sections); | |
7eada909 | 2637 | |
356d9d52 MP |
2638 | } |
2639 | if (!le32_to_cpu(ic->sb->journal_sections)) { | |
2640 | if (ic->log2_buffer_sectors > 3) { | |
2641 | ic->log2_buffer_sectors--; | |
2642 | goto try_smaller_buffer; | |
2643 | } | |
2644 | return -EINVAL; | |
2645 | } | |
7eada909 MP |
2646 | } |
2647 | ||
7eada909 MP |
2648 | ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors); |
2649 | ||
1f9fc0b8 MP |
2650 | sb_set_version(ic); |
2651 | ||
7eada909 MP |
2652 | return 0; |
2653 | } | |
2654 | ||
2655 | static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic) | |
2656 | { | |
2657 | struct gendisk *disk = dm_disk(dm_table_get_md(ti->table)); | |
2658 | struct blk_integrity bi; | |
2659 | ||
2660 | memset(&bi, 0, sizeof(bi)); | |
2661 | bi.profile = &dm_integrity_profile; | |
9d609f85 MP |
2662 | bi.tuple_size = ic->tag_size; |
2663 | bi.tag_size = bi.tuple_size; | |
84ff1bcc | 2664 | bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT; |
7eada909 MP |
2665 | |
2666 | blk_integrity_register(disk, &bi); | |
2667 | blk_queue_max_integrity_segments(disk->queue, UINT_MAX); | |
2668 | } | |
2669 | ||
7eada909 MP |
2670 | static void dm_integrity_free_page_list(struct dm_integrity_c *ic, struct page_list *pl) |
2671 | { | |
2672 | unsigned i; | |
2673 | ||
2674 | if (!pl) | |
2675 | return; | |
2676 | for (i = 0; i < ic->journal_pages; i++) | |
2677 | if (pl[i].page) | |
2678 | __free_page(pl[i].page); | |
2679 | kvfree(pl); | |
2680 | } | |
2681 | ||
2682 | static struct page_list *dm_integrity_alloc_page_list(struct dm_integrity_c *ic) | |
2683 | { | |
2684 | size_t page_list_desc_size = ic->journal_pages * sizeof(struct page_list); | |
2685 | struct page_list *pl; | |
2686 | unsigned i; | |
2687 | ||
702a6204 | 2688 | pl = kvmalloc(page_list_desc_size, GFP_KERNEL | __GFP_ZERO); |
7eada909 MP |
2689 | if (!pl) |
2690 | return NULL; | |
2691 | ||
2692 | for (i = 0; i < ic->journal_pages; i++) { | |
2693 | pl[i].page = alloc_page(GFP_KERNEL); | |
2694 | if (!pl[i].page) { | |
2695 | dm_integrity_free_page_list(ic, pl); | |
2696 | return NULL; | |
2697 | } | |
2698 | if (i) | |
2699 | pl[i - 1].next = &pl[i]; | |
2700 | } | |
2701 | ||
2702 | return pl; | |
2703 | } | |
2704 | ||
2705 | static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl) | |
2706 | { | |
2707 | unsigned i; | |
2708 | for (i = 0; i < ic->journal_sections; i++) | |
2709 | kvfree(sl[i]); | |
fc8cec11 | 2710 | kvfree(sl); |
7eada909 MP |
2711 | } |
2712 | ||
2713 | static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, struct page_list *pl) | |
2714 | { | |
2715 | struct scatterlist **sl; | |
2716 | unsigned i; | |
2717 | ||
344476e1 KC |
2718 | sl = kvmalloc_array(ic->journal_sections, |
2719 | sizeof(struct scatterlist *), | |
2720 | GFP_KERNEL | __GFP_ZERO); | |
7eada909 MP |
2721 | if (!sl) |
2722 | return NULL; | |
2723 | ||
2724 | for (i = 0; i < ic->journal_sections; i++) { | |
2725 | struct scatterlist *s; | |
2726 | unsigned start_index, start_offset; | |
2727 | unsigned end_index, end_offset; | |
2728 | unsigned n_pages; | |
2729 | unsigned idx; | |
2730 | ||
2731 | page_list_location(ic, i, 0, &start_index, &start_offset); | |
2732 | page_list_location(ic, i, ic->journal_section_sectors - 1, &end_index, &end_offset); | |
2733 | ||
2734 | n_pages = (end_index - start_index + 1); | |
2735 | ||
344476e1 KC |
2736 | s = kvmalloc_array(n_pages, sizeof(struct scatterlist), |
2737 | GFP_KERNEL); | |
7eada909 MP |
2738 | if (!s) { |
2739 | dm_integrity_free_journal_scatterlist(ic, sl); | |
2740 | return NULL; | |
2741 | } | |
2742 | ||
2743 | sg_init_table(s, n_pages); | |
2744 | for (idx = start_index; idx <= end_index; idx++) { | |
2745 | char *va = lowmem_page_address(pl[idx].page); | |
2746 | unsigned start = 0, end = PAGE_SIZE; | |
2747 | if (idx == start_index) | |
2748 | start = start_offset; | |
2749 | if (idx == end_index) | |
2750 | end = end_offset + (1 << SECTOR_SHIFT); | |
2751 | sg_set_buf(&s[idx - start_index], va + start, end - start); | |
2752 | } | |
2753 | ||
2754 | sl[i] = s; | |
2755 | } | |
2756 | ||
2757 | return sl; | |
2758 | } | |
2759 | ||
2760 | static void free_alg(struct alg_spec *a) | |
2761 | { | |
2762 | kzfree(a->alg_string); | |
2763 | kzfree(a->key); | |
2764 | memset(a, 0, sizeof *a); | |
2765 | } | |
2766 | ||
2767 | static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval) | |
2768 | { | |
2769 | char *k; | |
2770 | ||
2771 | free_alg(a); | |
2772 | ||
2773 | a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL); | |
2774 | if (!a->alg_string) | |
2775 | goto nomem; | |
2776 | ||
2777 | k = strchr(a->alg_string, ':'); | |
2778 | if (k) { | |
7eada909 MP |
2779 | *k = 0; |
2780 | a->key_string = k + 1; | |
2781 | if (strlen(a->key_string) & 1) | |
2782 | goto inval; | |
2783 | ||
2784 | a->key_size = strlen(a->key_string) / 2; | |
2785 | a->key = kmalloc(a->key_size, GFP_KERNEL); | |
2786 | if (!a->key) | |
2787 | goto nomem; | |
6625d903 MP |
2788 | if (hex2bin(a->key, a->key_string, a->key_size)) |
2789 | goto inval; | |
7eada909 MP |
2790 | } |
2791 | ||
2792 | return 0; | |
2793 | inval: | |
2794 | *error = error_inval; | |
2795 | return -EINVAL; | |
2796 | nomem: | |
2797 | *error = "Out of memory for an argument"; | |
2798 | return -ENOMEM; | |
2799 | } | |
2800 | ||
2801 | static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error, | |
2802 | char *error_alg, char *error_key) | |
2803 | { | |
2804 | int r; | |
2805 | ||
2806 | if (a->alg_string) { | |
2807 | *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ASYNC); | |
2808 | if (IS_ERR(*hash)) { | |
2809 | *error = error_alg; | |
2810 | r = PTR_ERR(*hash); | |
2811 | *hash = NULL; | |
2812 | return r; | |
2813 | } | |
2814 | ||
2815 | if (a->key) { | |
2816 | r = crypto_shash_setkey(*hash, a->key, a->key_size); | |
2817 | if (r) { | |
2818 | *error = error_key; | |
2819 | return r; | |
2820 | } | |
e16b4f99 MB |
2821 | } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) { |
2822 | *error = error_key; | |
2823 | return -ENOKEY; | |
7eada909 MP |
2824 | } |
2825 | } | |
2826 | ||
2827 | return 0; | |
2828 | } | |
2829 | ||
1aa0efd4 MS |
2830 | static int create_journal(struct dm_integrity_c *ic, char **error) |
2831 | { | |
2832 | int r = 0; | |
2833 | unsigned i; | |
2834 | __u64 journal_pages, journal_desc_size, journal_tree_size; | |
717f4b1c MP |
2835 | unsigned char *crypt_data = NULL, *crypt_iv = NULL; |
2836 | struct skcipher_request *req = NULL; | |
56b67a4f MP |
2837 | |
2838 | ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL); | |
2839 | ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL); | |
2840 | ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL); | |
2841 | ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL); | |
1aa0efd4 MS |
2842 | |
2843 | journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors, | |
2844 | PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT); | |
2845 | journal_desc_size = journal_pages * sizeof(struct page_list); | |
2846 | if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) { | |
2847 | *error = "Journal doesn't fit into memory"; | |
2848 | r = -ENOMEM; | |
2849 | goto bad; | |
2850 | } | |
2851 | ic->journal_pages = journal_pages; | |
2852 | ||
2853 | ic->journal = dm_integrity_alloc_page_list(ic); | |
2854 | if (!ic->journal) { | |
2855 | *error = "Could not allocate memory for journal"; | |
2856 | r = -ENOMEM; | |
2857 | goto bad; | |
2858 | } | |
2859 | if (ic->journal_crypt_alg.alg_string) { | |
2860 | unsigned ivsize, blocksize; | |
2861 | struct journal_completion comp; | |
2862 | ||
2863 | comp.ic = ic; | |
2864 | ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0); | |
2865 | if (IS_ERR(ic->journal_crypt)) { | |
2866 | *error = "Invalid journal cipher"; | |
2867 | r = PTR_ERR(ic->journal_crypt); | |
2868 | ic->journal_crypt = NULL; | |
2869 | goto bad; | |
2870 | } | |
2871 | ivsize = crypto_skcipher_ivsize(ic->journal_crypt); | |
2872 | blocksize = crypto_skcipher_blocksize(ic->journal_crypt); | |
2873 | ||
2874 | if (ic->journal_crypt_alg.key) { | |
2875 | r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key, | |
2876 | ic->journal_crypt_alg.key_size); | |
2877 | if (r) { | |
2878 | *error = "Error setting encryption key"; | |
2879 | goto bad; | |
2880 | } | |
2881 | } | |
2882 | DEBUG_print("cipher %s, block size %u iv size %u\n", | |
2883 | ic->journal_crypt_alg.alg_string, blocksize, ivsize); | |
2884 | ||
2885 | ic->journal_io = dm_integrity_alloc_page_list(ic); | |
2886 | if (!ic->journal_io) { | |
2887 | *error = "Could not allocate memory for journal io"; | |
2888 | r = -ENOMEM; | |
2889 | goto bad; | |
2890 | } | |
2891 | ||
2892 | if (blocksize == 1) { | |
2893 | struct scatterlist *sg; | |
717f4b1c MP |
2894 | |
2895 | req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); | |
2896 | if (!req) { | |
2897 | *error = "Could not allocate crypt request"; | |
2898 | r = -ENOMEM; | |
2899 | goto bad; | |
2900 | } | |
2901 | ||
2902 | crypt_iv = kmalloc(ivsize, GFP_KERNEL); | |
2903 | if (!crypt_iv) { | |
2904 | *error = "Could not allocate iv"; | |
2905 | r = -ENOMEM; | |
2906 | goto bad; | |
2907 | } | |
1aa0efd4 MS |
2908 | |
2909 | ic->journal_xor = dm_integrity_alloc_page_list(ic); | |
2910 | if (!ic->journal_xor) { | |
2911 | *error = "Could not allocate memory for journal xor"; | |
2912 | r = -ENOMEM; | |
2913 | goto bad; | |
2914 | } | |
2915 | ||
344476e1 KC |
2916 | sg = kvmalloc_array(ic->journal_pages + 1, |
2917 | sizeof(struct scatterlist), | |
2918 | GFP_KERNEL); | |
1aa0efd4 MS |
2919 | if (!sg) { |
2920 | *error = "Unable to allocate sg list"; | |
2921 | r = -ENOMEM; | |
2922 | goto bad; | |
2923 | } | |
2924 | sg_init_table(sg, ic->journal_pages + 1); | |
2925 | for (i = 0; i < ic->journal_pages; i++) { | |
2926 | char *va = lowmem_page_address(ic->journal_xor[i].page); | |
2927 | clear_page(va); | |
2928 | sg_set_buf(&sg[i], va, PAGE_SIZE); | |
2929 | } | |
2930 | sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids); | |
717f4b1c | 2931 | memset(crypt_iv, 0x00, ivsize); |
1aa0efd4 | 2932 | |
717f4b1c | 2933 | skcipher_request_set_crypt(req, sg, sg, PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv); |
b5e8ad92 | 2934 | init_completion(&comp.comp); |
1aa0efd4 MS |
2935 | comp.in_flight = (atomic_t)ATOMIC_INIT(1); |
2936 | if (do_crypt(true, req, &comp)) | |
2937 | wait_for_completion(&comp.comp); | |
2938 | kvfree(sg); | |
2939 | r = dm_integrity_failed(ic); | |
2940 | if (r) { | |
2941 | *error = "Unable to encrypt journal"; | |
2942 | goto bad; | |
2943 | } | |
2944 | DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data"); | |
2945 | ||
2946 | crypto_free_skcipher(ic->journal_crypt); | |
2947 | ic->journal_crypt = NULL; | |
2948 | } else { | |
1aa0efd4 | 2949 | unsigned crypt_len = roundup(ivsize, blocksize); |
56b67a4f | 2950 | |
717f4b1c MP |
2951 | req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); |
2952 | if (!req) { | |
2953 | *error = "Could not allocate crypt request"; | |
2954 | r = -ENOMEM; | |
2955 | goto bad; | |
2956 | } | |
2957 | ||
2958 | crypt_iv = kmalloc(ivsize, GFP_KERNEL); | |
2959 | if (!crypt_iv) { | |
2960 | *error = "Could not allocate iv"; | |
2961 | r = -ENOMEM; | |
2962 | goto bad; | |
2963 | } | |
2964 | ||
56b67a4f MP |
2965 | crypt_data = kmalloc(crypt_len, GFP_KERNEL); |
2966 | if (!crypt_data) { | |
2967 | *error = "Unable to allocate crypt data"; | |
2968 | r = -ENOMEM; | |
2969 | goto bad; | |
2970 | } | |
1aa0efd4 | 2971 | |
1aa0efd4 MS |
2972 | ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal); |
2973 | if (!ic->journal_scatterlist) { | |
2974 | *error = "Unable to allocate sg list"; | |
2975 | r = -ENOMEM; | |
2976 | goto bad; | |
2977 | } | |
2978 | ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io); | |
2979 | if (!ic->journal_io_scatterlist) { | |
2980 | *error = "Unable to allocate sg list"; | |
2981 | r = -ENOMEM; | |
2982 | goto bad; | |
2983 | } | |
344476e1 KC |
2984 | ic->sk_requests = kvmalloc_array(ic->journal_sections, |
2985 | sizeof(struct skcipher_request *), | |
2986 | GFP_KERNEL | __GFP_ZERO); | |
1aa0efd4 MS |
2987 | if (!ic->sk_requests) { |
2988 | *error = "Unable to allocate sk requests"; | |
2989 | r = -ENOMEM; | |
2990 | goto bad; | |
2991 | } | |
2992 | for (i = 0; i < ic->journal_sections; i++) { | |
2993 | struct scatterlist sg; | |
2994 | struct skcipher_request *section_req; | |
2995 | __u32 section_le = cpu_to_le32(i); | |
2996 | ||
717f4b1c | 2997 | memset(crypt_iv, 0x00, ivsize); |
1aa0efd4 MS |
2998 | memset(crypt_data, 0x00, crypt_len); |
2999 | memcpy(crypt_data, §ion_le, min((size_t)crypt_len, sizeof(section_le))); | |
3000 | ||
3001 | sg_init_one(&sg, crypt_data, crypt_len); | |
717f4b1c | 3002 | skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv); |
b5e8ad92 | 3003 | init_completion(&comp.comp); |
1aa0efd4 MS |
3004 | comp.in_flight = (atomic_t)ATOMIC_INIT(1); |
3005 | if (do_crypt(true, req, &comp)) | |
3006 | wait_for_completion(&comp.comp); | |
3007 | ||
3008 | r = dm_integrity_failed(ic); | |
3009 | if (r) { | |
3010 | *error = "Unable to generate iv"; | |
3011 | goto bad; | |
3012 | } | |
3013 | ||
3014 | section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); | |
3015 | if (!section_req) { | |
3016 | *error = "Unable to allocate crypt request"; | |
3017 | r = -ENOMEM; | |
3018 | goto bad; | |
3019 | } | |
6da2ec56 KC |
3020 | section_req->iv = kmalloc_array(ivsize, 2, |
3021 | GFP_KERNEL); | |
1aa0efd4 MS |
3022 | if (!section_req->iv) { |
3023 | skcipher_request_free(section_req); | |
3024 | *error = "Unable to allocate iv"; | |
3025 | r = -ENOMEM; | |
3026 | goto bad; | |
3027 | } | |
3028 | memcpy(section_req->iv + ivsize, crypt_data, ivsize); | |
3029 | section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT; | |
3030 | ic->sk_requests[i] = section_req; | |
3031 | DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i); | |
3032 | } | |
3033 | } | |
3034 | } | |
3035 | ||
3036 | for (i = 0; i < N_COMMIT_IDS; i++) { | |
3037 | unsigned j; | |
3038 | retest_commit_id: | |
3039 | for (j = 0; j < i; j++) { | |
3040 | if (ic->commit_ids[j] == ic->commit_ids[i]) { | |
3041 | ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1); | |
3042 | goto retest_commit_id; | |
3043 | } | |
3044 | } | |
3045 | DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]); | |
3046 | } | |
3047 | ||
3048 | journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node); | |
3049 | if (journal_tree_size > ULONG_MAX) { | |
3050 | *error = "Journal doesn't fit into memory"; | |
3051 | r = -ENOMEM; | |
3052 | goto bad; | |
3053 | } | |
702a6204 | 3054 | ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL); |
1aa0efd4 MS |
3055 | if (!ic->journal_tree) { |
3056 | *error = "Could not allocate memory for journal tree"; | |
3057 | r = -ENOMEM; | |
3058 | } | |
3059 | bad: | |
56b67a4f | 3060 | kfree(crypt_data); |
717f4b1c MP |
3061 | kfree(crypt_iv); |
3062 | skcipher_request_free(req); | |
3063 | ||
1aa0efd4 MS |
3064 | return r; |
3065 | } | |
3066 | ||
7eada909 | 3067 | /* |
56b67a4f | 3068 | * Construct a integrity mapping |
7eada909 MP |
3069 | * |
3070 | * Arguments: | |
3071 | * device | |
3072 | * offset from the start of the device | |
3073 | * tag size | |
56b67a4f | 3074 | * D - direct writes, J - journal writes, R - recovery mode |
7eada909 MP |
3075 | * number of optional arguments |
3076 | * optional arguments: | |
56b67a4f MP |
3077 | * journal_sectors |
3078 | * interleave_sectors | |
3079 | * buffer_sectors | |
3080 | * journal_watermark | |
3081 | * commit_time | |
3082 | * internal_hash | |
3083 | * journal_crypt | |
3084 | * journal_mac | |
9d609f85 | 3085 | * block_size |
7eada909 MP |
3086 | */ |
3087 | static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
3088 | { | |
3089 | struct dm_integrity_c *ic; | |
3090 | char dummy; | |
3091 | int r; | |
7eada909 MP |
3092 | unsigned extra_args; |
3093 | struct dm_arg_set as; | |
5916a22b | 3094 | static const struct dm_arg _args[] = { |
9d609f85 | 3095 | {0, 9, "Invalid number of feature args"}, |
7eada909 MP |
3096 | }; |
3097 | unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec; | |
a3fcf725 | 3098 | bool recalculate; |
7eada909 | 3099 | bool should_write_sb; |
7eada909 MP |
3100 | __u64 threshold; |
3101 | unsigned long long start; | |
3102 | ||
3103 | #define DIRECT_ARGUMENTS 4 | |
3104 | ||
3105 | if (argc <= DIRECT_ARGUMENTS) { | |
3106 | ti->error = "Invalid argument count"; | |
3107 | return -EINVAL; | |
3108 | } | |
3109 | ||
3110 | ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL); | |
3111 | if (!ic) { | |
3112 | ti->error = "Cannot allocate integrity context"; | |
3113 | return -ENOMEM; | |
3114 | } | |
3115 | ti->private = ic; | |
3116 | ti->per_io_data_size = sizeof(struct dm_integrity_io); | |
3117 | ||
7eada909 | 3118 | ic->in_progress = RB_ROOT; |
724376a0 | 3119 | INIT_LIST_HEAD(&ic->wait_list); |
7eada909 MP |
3120 | init_waitqueue_head(&ic->endio_wait); |
3121 | bio_list_init(&ic->flush_bio_list); | |
3122 | init_waitqueue_head(&ic->copy_to_journal_wait); | |
3123 | init_completion(&ic->crypto_backoff); | |
3f2e5393 | 3124 | atomic64_set(&ic->number_of_mismatches, 0); |
7eada909 MP |
3125 | |
3126 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev); | |
3127 | if (r) { | |
3128 | ti->error = "Device lookup failed"; | |
3129 | goto bad; | |
3130 | } | |
3131 | ||
3132 | if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) { | |
3133 | ti->error = "Invalid starting offset"; | |
3134 | r = -EINVAL; | |
3135 | goto bad; | |
3136 | } | |
3137 | ic->start = start; | |
3138 | ||
3139 | if (strcmp(argv[2], "-")) { | |
3140 | if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) { | |
3141 | ti->error = "Invalid tag size"; | |
3142 | r = -EINVAL; | |
3143 | goto bad; | |
3144 | } | |
3145 | } | |
3146 | ||
c2bcb2b7 | 3147 | if (!strcmp(argv[3], "J") || !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) |
7eada909 MP |
3148 | ic->mode = argv[3][0]; |
3149 | else { | |
56b67a4f | 3150 | ti->error = "Invalid mode (expecting J, D, R)"; |
7eada909 MP |
3151 | r = -EINVAL; |
3152 | goto bad; | |
3153 | } | |
3154 | ||
356d9d52 | 3155 | journal_sectors = 0; |
7eada909 MP |
3156 | interleave_sectors = DEFAULT_INTERLEAVE_SECTORS; |
3157 | buffer_sectors = DEFAULT_BUFFER_SECTORS; | |
3158 | journal_watermark = DEFAULT_JOURNAL_WATERMARK; | |
3159 | sync_msec = DEFAULT_SYNC_MSEC; | |
a3fcf725 | 3160 | recalculate = false; |
9d609f85 | 3161 | ic->sectors_per_block = 1; |
7eada909 MP |
3162 | |
3163 | as.argc = argc - DIRECT_ARGUMENTS; | |
3164 | as.argv = argv + DIRECT_ARGUMENTS; | |
3165 | r = dm_read_arg_group(_args, &as, &extra_args, &ti->error); | |
3166 | if (r) | |
3167 | goto bad; | |
3168 | ||
3169 | while (extra_args--) { | |
3170 | const char *opt_string; | |
3171 | unsigned val; | |
3172 | opt_string = dm_shift_arg(&as); | |
3173 | if (!opt_string) { | |
3174 | r = -EINVAL; | |
3175 | ti->error = "Not enough feature arguments"; | |
3176 | goto bad; | |
3177 | } | |
56b67a4f | 3178 | if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1) |
356d9d52 | 3179 | journal_sectors = val ? val : 1; |
56b67a4f | 3180 | else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1) |
7eada909 | 3181 | interleave_sectors = val; |
56b67a4f | 3182 | else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1) |
7eada909 | 3183 | buffer_sectors = val; |
56b67a4f | 3184 | else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100) |
7eada909 | 3185 | journal_watermark = val; |
56b67a4f | 3186 | else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1) |
7eada909 | 3187 | sync_msec = val; |
356d9d52 MP |
3188 | else if (!memcmp(opt_string, "meta_device:", strlen("meta_device:"))) { |
3189 | if (ic->meta_dev) { | |
3190 | dm_put_device(ti, ic->meta_dev); | |
3191 | ic->meta_dev = NULL; | |
3192 | } | |
3193 | r = dm_get_device(ti, strchr(opt_string, ':') + 1, dm_table_get_mode(ti->table), &ic->meta_dev); | |
3194 | if (r) { | |
3195 | ti->error = "Device lookup failed"; | |
3196 | goto bad; | |
3197 | } | |
3198 | } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) { | |
9d609f85 MP |
3199 | if (val < 1 << SECTOR_SHIFT || |
3200 | val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT || | |
3201 | (val & (val -1))) { | |
3202 | r = -EINVAL; | |
3203 | ti->error = "Invalid block_size argument"; | |
3204 | goto bad; | |
3205 | } | |
3206 | ic->sectors_per_block = val >> SECTOR_SHIFT; | |
3207 | } else if (!memcmp(opt_string, "internal_hash:", strlen("internal_hash:"))) { | |
7eada909 | 3208 | r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error, |
56b67a4f | 3209 | "Invalid internal_hash argument"); |
7eada909 MP |
3210 | if (r) |
3211 | goto bad; | |
56b67a4f | 3212 | } else if (!memcmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) { |
7eada909 | 3213 | r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error, |
56b67a4f | 3214 | "Invalid journal_crypt argument"); |
7eada909 MP |
3215 | if (r) |
3216 | goto bad; | |
56b67a4f | 3217 | } else if (!memcmp(opt_string, "journal_mac:", strlen("journal_mac:"))) { |
7eada909 | 3218 | r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error, |
56b67a4f | 3219 | "Invalid journal_mac argument"); |
7eada909 MP |
3220 | if (r) |
3221 | goto bad; | |
a3fcf725 MP |
3222 | } else if (!strcmp(opt_string, "recalculate")) { |
3223 | recalculate = true; | |
7eada909 MP |
3224 | } else { |
3225 | r = -EINVAL; | |
3226 | ti->error = "Invalid argument"; | |
3227 | goto bad; | |
3228 | } | |
3229 | } | |
3230 | ||
356d9d52 MP |
3231 | ic->data_device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT; |
3232 | if (!ic->meta_dev) | |
3233 | ic->meta_device_sectors = ic->data_device_sectors; | |
3234 | else | |
3235 | ic->meta_device_sectors = i_size_read(ic->meta_dev->bdev->bd_inode) >> SECTOR_SHIFT; | |
3236 | ||
3237 | if (!journal_sectors) { | |
3238 | journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS, | |
3239 | ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR); | |
3240 | } | |
3241 | ||
3242 | if (!buffer_sectors) | |
3243 | buffer_sectors = 1; | |
3244 | ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT); | |
3245 | ||
7eada909 MP |
3246 | r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error, |
3247 | "Invalid internal hash", "Error setting internal hash key"); | |
3248 | if (r) | |
3249 | goto bad; | |
3250 | ||
3251 | r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error, | |
3252 | "Invalid journal mac", "Error setting journal mac key"); | |
3253 | if (r) | |
3254 | goto bad; | |
3255 | ||
3256 | if (!ic->tag_size) { | |
3257 | if (!ic->internal_hash) { | |
3258 | ti->error = "Unknown tag size"; | |
3259 | r = -EINVAL; | |
3260 | goto bad; | |
3261 | } | |
3262 | ic->tag_size = crypto_shash_digestsize(ic->internal_hash); | |
3263 | } | |
3264 | if (ic->tag_size > MAX_TAG_SIZE) { | |
3265 | ti->error = "Too big tag size"; | |
3266 | r = -EINVAL; | |
3267 | goto bad; | |
3268 | } | |
3269 | if (!(ic->tag_size & (ic->tag_size - 1))) | |
3270 | ic->log2_tag_size = __ffs(ic->tag_size); | |
3271 | else | |
3272 | ic->log2_tag_size = -1; | |
3273 | ||
3274 | ic->autocommit_jiffies = msecs_to_jiffies(sync_msec); | |
3275 | ic->autocommit_msec = sync_msec; | |
8376d3c1 | 3276 | timer_setup(&ic->autocommit_timer, autocommit_fn, 0); |
7eada909 MP |
3277 | |
3278 | ic->io = dm_io_client_create(); | |
3279 | if (IS_ERR(ic->io)) { | |
3280 | r = PTR_ERR(ic->io); | |
3281 | ic->io = NULL; | |
3282 | ti->error = "Cannot allocate dm io"; | |
3283 | goto bad; | |
3284 | } | |
3285 | ||
6f1c819c KO |
3286 | r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache); |
3287 | if (r) { | |
7eada909 MP |
3288 | ti->error = "Cannot allocate mempool"; |
3289 | goto bad; | |
3290 | } | |
3291 | ||
3292 | ic->metadata_wq = alloc_workqueue("dm-integrity-metadata", | |
3293 | WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE); | |
3294 | if (!ic->metadata_wq) { | |
3295 | ti->error = "Cannot allocate workqueue"; | |
3296 | r = -ENOMEM; | |
3297 | goto bad; | |
3298 | } | |
3299 | ||
3300 | /* | |
3301 | * If this workqueue were percpu, it would cause bio reordering | |
3302 | * and reduced performance. | |
3303 | */ | |
3304 | ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); | |
3305 | if (!ic->wait_wq) { | |
3306 | ti->error = "Cannot allocate workqueue"; | |
3307 | r = -ENOMEM; | |
3308 | goto bad; | |
3309 | } | |
3310 | ||
3311 | ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1); | |
3312 | if (!ic->commit_wq) { | |
3313 | ti->error = "Cannot allocate workqueue"; | |
3314 | r = -ENOMEM; | |
3315 | goto bad; | |
3316 | } | |
3317 | INIT_WORK(&ic->commit_work, integrity_commit); | |
3318 | ||
3319 | if (ic->mode == 'J') { | |
3320 | ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1); | |
3321 | if (!ic->writer_wq) { | |
3322 | ti->error = "Cannot allocate workqueue"; | |
3323 | r = -ENOMEM; | |
3324 | goto bad; | |
3325 | } | |
3326 | INIT_WORK(&ic->writer_work, integrity_writer); | |
3327 | } | |
3328 | ||
3329 | ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL); | |
3330 | if (!ic->sb) { | |
3331 | r = -ENOMEM; | |
3332 | ti->error = "Cannot allocate superblock area"; | |
3333 | goto bad; | |
3334 | } | |
3335 | ||
3336 | r = sync_rw_sb(ic, REQ_OP_READ, 0); | |
3337 | if (r) { | |
3338 | ti->error = "Error reading superblock"; | |
3339 | goto bad; | |
3340 | } | |
c2bcb2b7 MP |
3341 | should_write_sb = false; |
3342 | if (memcmp(ic->sb->magic, SB_MAGIC, 8)) { | |
3343 | if (ic->mode != 'R') { | |
56b67a4f MP |
3344 | if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) { |
3345 | r = -EINVAL; | |
3346 | ti->error = "The device is not initialized"; | |
3347 | goto bad; | |
7eada909 MP |
3348 | } |
3349 | } | |
3350 | ||
3351 | r = initialize_superblock(ic, journal_sectors, interleave_sectors); | |
3352 | if (r) { | |
3353 | ti->error = "Could not initialize superblock"; | |
3354 | goto bad; | |
3355 | } | |
c2bcb2b7 MP |
3356 | if (ic->mode != 'R') |
3357 | should_write_sb = true; | |
7eada909 MP |
3358 | } |
3359 | ||
1f9fc0b8 | 3360 | if (!ic->sb->version || ic->sb->version > SB_VERSION_2) { |
7eada909 MP |
3361 | r = -EINVAL; |
3362 | ti->error = "Unknown version"; | |
3363 | goto bad; | |
3364 | } | |
3365 | if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) { | |
3366 | r = -EINVAL; | |
9d609f85 MP |
3367 | ti->error = "Tag size doesn't match the information in superblock"; |
3368 | goto bad; | |
3369 | } | |
3370 | if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) { | |
3371 | r = -EINVAL; | |
3372 | ti->error = "Block size doesn't match the information in superblock"; | |
7eada909 MP |
3373 | goto bad; |
3374 | } | |
bc86a41e MP |
3375 | if (!le32_to_cpu(ic->sb->journal_sections)) { |
3376 | r = -EINVAL; | |
3377 | ti->error = "Corrupted superblock, journal_sections is 0"; | |
3378 | goto bad; | |
3379 | } | |
7eada909 | 3380 | /* make sure that ti->max_io_len doesn't overflow */ |
356d9d52 MP |
3381 | if (!ic->meta_dev) { |
3382 | if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS || | |
3383 | ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) { | |
3384 | r = -EINVAL; | |
3385 | ti->error = "Invalid interleave_sectors in the superblock"; | |
3386 | goto bad; | |
3387 | } | |
3388 | } else { | |
3389 | if (ic->sb->log2_interleave_sectors) { | |
3390 | r = -EINVAL; | |
3391 | ti->error = "Invalid interleave_sectors in the superblock"; | |
3392 | goto bad; | |
3393 | } | |
7eada909 MP |
3394 | } |
3395 | ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors); | |
3396 | if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) { | |
3397 | /* test for overflow */ | |
3398 | r = -EINVAL; | |
3399 | ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors"; | |
3400 | goto bad; | |
3401 | } | |
3402 | if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) { | |
3403 | r = -EINVAL; | |
3404 | ti->error = "Journal mac mismatch"; | |
3405 | goto bad; | |
3406 | } | |
356d9d52 MP |
3407 | |
3408 | try_smaller_buffer: | |
7eada909 MP |
3409 | r = calculate_device_limits(ic); |
3410 | if (r) { | |
356d9d52 MP |
3411 | if (ic->meta_dev) { |
3412 | if (ic->log2_buffer_sectors > 3) { | |
3413 | ic->log2_buffer_sectors--; | |
3414 | goto try_smaller_buffer; | |
3415 | } | |
3416 | } | |
7eada909 MP |
3417 | ti->error = "The device is too small"; |
3418 | goto bad; | |
3419 | } | |
356d9d52 MP |
3420 | if (!ic->meta_dev) |
3421 | ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run)); | |
3422 | ||
2ad50606 OM |
3423 | if (ti->len > ic->provided_data_sectors) { |
3424 | r = -EINVAL; | |
3425 | ti->error = "Not enough provided sectors for requested mapping size"; | |
3426 | goto bad; | |
3427 | } | |
7eada909 | 3428 | |
7eada909 MP |
3429 | |
3430 | threshold = (__u64)ic->journal_entries * (100 - journal_watermark); | |
3431 | threshold += 50; | |
3432 | do_div(threshold, 100); | |
3433 | ic->free_sectors_threshold = threshold; | |
3434 | ||
3435 | DEBUG_print("initialized:\n"); | |
3436 | DEBUG_print(" integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size)); | |
3437 | DEBUG_print(" journal_entry_size %u\n", ic->journal_entry_size); | |
3438 | DEBUG_print(" journal_entries_per_sector %u\n", ic->journal_entries_per_sector); | |
3439 | DEBUG_print(" journal_section_entries %u\n", ic->journal_section_entries); | |
3440 | DEBUG_print(" journal_section_sectors %u\n", ic->journal_section_sectors); | |
3441 | DEBUG_print(" journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections)); | |
3442 | DEBUG_print(" journal_entries %u\n", ic->journal_entries); | |
3443 | DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors); | |
3444 | DEBUG_print(" device_sectors 0x%llx\n", (unsigned long long)ic->device_sectors); | |
3445 | DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors); | |
3446 | DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run); | |
3447 | DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run); | |
3448 | DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors, | |
3449 | (unsigned long long)ic->provided_data_sectors); | |
3450 | DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors); | |
3451 | ||
a3fcf725 MP |
3452 | if (recalculate && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) { |
3453 | ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); | |
3454 | ic->sb->recalc_sector = cpu_to_le64(0); | |
3455 | } | |
3456 | ||
3457 | if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) { | |
3458 | if (!ic->internal_hash) { | |
3459 | r = -EINVAL; | |
3460 | ti->error = "Recalculate is only valid with internal hash"; | |
3461 | goto bad; | |
3462 | } | |
3463 | ic->recalc_wq = alloc_workqueue("dm-intergrity-recalc", WQ_MEM_RECLAIM, 1); | |
3464 | if (!ic->recalc_wq ) { | |
3465 | ti->error = "Cannot allocate workqueue"; | |
3466 | r = -ENOMEM; | |
3467 | goto bad; | |
3468 | } | |
3469 | INIT_WORK(&ic->recalc_work, integrity_recalc); | |
3470 | ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT); | |
3471 | if (!ic->recalc_buffer) { | |
3472 | ti->error = "Cannot allocate buffer for recalculating"; | |
3473 | r = -ENOMEM; | |
3474 | goto bad; | |
3475 | } | |
329e0989 KC |
3476 | ic->recalc_tags = kvmalloc_array(RECALC_SECTORS >> ic->sb->log2_sectors_per_block, |
3477 | ic->tag_size, GFP_KERNEL); | |
a3fcf725 MP |
3478 | if (!ic->recalc_tags) { |
3479 | ti->error = "Cannot allocate tags for recalculating"; | |
3480 | r = -ENOMEM; | |
3481 | goto bad; | |
3482 | } | |
3483 | } | |
3484 | ||
356d9d52 MP |
3485 | ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev, |
3486 | 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL); | |
7eada909 MP |
3487 | if (IS_ERR(ic->bufio)) { |
3488 | r = PTR_ERR(ic->bufio); | |
3489 | ti->error = "Cannot initialize dm-bufio"; | |
3490 | ic->bufio = NULL; | |
3491 | goto bad; | |
3492 | } | |
3493 | dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors); | |
3494 | ||
c2bcb2b7 MP |
3495 | if (ic->mode != 'R') { |
3496 | r = create_journal(ic, &ti->error); | |
3497 | if (r) | |
3498 | goto bad; | |
3499 | } | |
7eada909 MP |
3500 | |
3501 | if (should_write_sb) { | |
3502 | int r; | |
3503 | ||
3504 | init_journal(ic, 0, ic->journal_sections, 0); | |
3505 | r = dm_integrity_failed(ic); | |
3506 | if (unlikely(r)) { | |
3507 | ti->error = "Error initializing journal"; | |
3508 | goto bad; | |
3509 | } | |
3510 | r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA); | |
3511 | if (r) { | |
3512 | ti->error = "Error initializing superblock"; | |
3513 | goto bad; | |
3514 | } | |
3515 | ic->just_formatted = true; | |
3516 | } | |
3517 | ||
356d9d52 MP |
3518 | if (!ic->meta_dev) { |
3519 | r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors); | |
3520 | if (r) | |
3521 | goto bad; | |
3522 | } | |
7eada909 MP |
3523 | |
3524 | if (!ic->internal_hash) | |
3525 | dm_integrity_set(ti, ic); | |
3526 | ||
3527 | ti->num_flush_bios = 1; | |
3528 | ti->flush_supported = true; | |
3529 | ||
3530 | return 0; | |
3531 | bad: | |
3532 | dm_integrity_dtr(ti); | |
3533 | return r; | |
3534 | } | |
3535 | ||
3536 | static void dm_integrity_dtr(struct dm_target *ti) | |
3537 | { | |
3538 | struct dm_integrity_c *ic = ti->private; | |
3539 | ||
3540 | BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress)); | |
724376a0 | 3541 | BUG_ON(!list_empty(&ic->wait_list)); |
7eada909 MP |
3542 | |
3543 | if (ic->metadata_wq) | |
3544 | destroy_workqueue(ic->metadata_wq); | |
3545 | if (ic->wait_wq) | |
3546 | destroy_workqueue(ic->wait_wq); | |
3547 | if (ic->commit_wq) | |
3548 | destroy_workqueue(ic->commit_wq); | |
3549 | if (ic->writer_wq) | |
3550 | destroy_workqueue(ic->writer_wq); | |
a3fcf725 MP |
3551 | if (ic->recalc_wq) |
3552 | destroy_workqueue(ic->recalc_wq); | |
3553 | if (ic->recalc_buffer) | |
3554 | vfree(ic->recalc_buffer); | |
3555 | if (ic->recalc_tags) | |
3556 | kvfree(ic->recalc_tags); | |
7eada909 MP |
3557 | if (ic->bufio) |
3558 | dm_bufio_client_destroy(ic->bufio); | |
6f1c819c | 3559 | mempool_exit(&ic->journal_io_mempool); |
7eada909 MP |
3560 | if (ic->io) |
3561 | dm_io_client_destroy(ic->io); | |
3562 | if (ic->dev) | |
3563 | dm_put_device(ti, ic->dev); | |
356d9d52 MP |
3564 | if (ic->meta_dev) |
3565 | dm_put_device(ti, ic->meta_dev); | |
7eada909 MP |
3566 | dm_integrity_free_page_list(ic, ic->journal); |
3567 | dm_integrity_free_page_list(ic, ic->journal_io); | |
3568 | dm_integrity_free_page_list(ic, ic->journal_xor); | |
3569 | if (ic->journal_scatterlist) | |
3570 | dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist); | |
3571 | if (ic->journal_io_scatterlist) | |
3572 | dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist); | |
3573 | if (ic->sk_requests) { | |
3574 | unsigned i; | |
3575 | ||
3576 | for (i = 0; i < ic->journal_sections; i++) { | |
3577 | struct skcipher_request *req = ic->sk_requests[i]; | |
3578 | if (req) { | |
3579 | kzfree(req->iv); | |
3580 | skcipher_request_free(req); | |
3581 | } | |
3582 | } | |
3583 | kvfree(ic->sk_requests); | |
3584 | } | |
3585 | kvfree(ic->journal_tree); | |
3586 | if (ic->sb) | |
3587 | free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT); | |
3588 | ||
3589 | if (ic->internal_hash) | |
3590 | crypto_free_shash(ic->internal_hash); | |
3591 | free_alg(&ic->internal_hash_alg); | |
3592 | ||
3593 | if (ic->journal_crypt) | |
3594 | crypto_free_skcipher(ic->journal_crypt); | |
3595 | free_alg(&ic->journal_crypt_alg); | |
3596 | ||
3597 | if (ic->journal_mac) | |
3598 | crypto_free_shash(ic->journal_mac); | |
3599 | free_alg(&ic->journal_mac_alg); | |
3600 | ||
3601 | kfree(ic); | |
3602 | } | |
3603 | ||
3604 | static struct target_type integrity_target = { | |
3605 | .name = "integrity", | |
a3fcf725 | 3606 | .version = {1, 2, 0}, |
7eada909 MP |
3607 | .module = THIS_MODULE, |
3608 | .features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY, | |
3609 | .ctr = dm_integrity_ctr, | |
3610 | .dtr = dm_integrity_dtr, | |
3611 | .map = dm_integrity_map, | |
3612 | .postsuspend = dm_integrity_postsuspend, | |
3613 | .resume = dm_integrity_resume, | |
3614 | .status = dm_integrity_status, | |
3615 | .iterate_devices = dm_integrity_iterate_devices, | |
9d609f85 | 3616 | .io_hints = dm_integrity_io_hints, |
7eada909 MP |
3617 | }; |
3618 | ||
3619 | int __init dm_integrity_init(void) | |
3620 | { | |
3621 | int r; | |
3622 | ||
3623 | journal_io_cache = kmem_cache_create("integrity_journal_io", | |
3624 | sizeof(struct journal_io), 0, 0, NULL); | |
3625 | if (!journal_io_cache) { | |
3626 | DMERR("can't allocate journal io cache"); | |
3627 | return -ENOMEM; | |
3628 | } | |
3629 | ||
3630 | r = dm_register_target(&integrity_target); | |
3631 | ||
3632 | if (r < 0) | |
3633 | DMERR("register failed %d", r); | |
3634 | ||
3635 | return r; | |
3636 | } | |
3637 | ||
3638 | void dm_integrity_exit(void) | |
3639 | { | |
3640 | dm_unregister_target(&integrity_target); | |
3641 | kmem_cache_destroy(journal_io_cache); | |
3642 | } | |
3643 | ||
3644 | module_init(dm_integrity_init); | |
3645 | module_exit(dm_integrity_exit); | |
3646 | ||
3647 | MODULE_AUTHOR("Milan Broz"); | |
3648 | MODULE_AUTHOR("Mikulas Patocka"); | |
3649 | MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension"); | |
3650 | MODULE_LICENSE("GPL"); |