1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "bcachefs.h"
4 #include "checksum.h"
5 #include "disk_groups.h"
6 #include "ec.h"
7 #include "error.h"
8 #include "journal.h"
9 #include "journal_sb.h"
10 #include "journal_seq_blacklist.h"
11 #include "recovery_passes.h"
12 #include "replicas.h"
13 #include "quota.h"
14 #include "sb-clean.h"
15 #include "sb-counters.h"
16 #include "sb-downgrade.h"
17 #include "sb-errors.h"
18 #include "sb-members.h"
19 #include "super-io.h"
20 #include "super.h"
21 #include "trace.h"
22 #include "vstructs.h"
23
24 #include <linux/backing-dev.h>
25 #include <linux/sort.h>
26 #include <linux/string_choices.h>
27
28 struct bch2_metadata_version {
29 u16 version;
30 const char *name;
31 };
32
33 static const struct bch2_metadata_version bch2_metadata_versions[] = {
34 #define x(n, v) { \
35 .version = v, \
36 .name = #n, \
37 },
38 BCH_METADATA_VERSIONS()
39 #undef x
40 };
41
bch2_version_to_text(struct printbuf * out,enum bcachefs_metadata_version v)42 void bch2_version_to_text(struct printbuf *out, enum bcachefs_metadata_version v)
43 {
44 const char *str = "(unknown version)";
45
46 for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
47 if (bch2_metadata_versions[i].version == v) {
48 str = bch2_metadata_versions[i].name;
49 break;
50 }
51
52 prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str);
53 }
54
bch2_latest_compatible_version(enum bcachefs_metadata_version v)55 enum bcachefs_metadata_version bch2_latest_compatible_version(enum bcachefs_metadata_version v)
56 {
57 if (!BCH_VERSION_MAJOR(v))
58 return v;
59
60 for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
61 if (bch2_metadata_versions[i].version > v &&
62 BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) ==
63 BCH_VERSION_MAJOR(v))
64 v = bch2_metadata_versions[i].version;
65
66 return v;
67 }
68
bch2_set_version_incompat(struct bch_fs * c,enum bcachefs_metadata_version version)69 int bch2_set_version_incompat(struct bch_fs *c, enum bcachefs_metadata_version version)
70 {
71 int ret = ((c->sb.features & BIT_ULL(BCH_FEATURE_incompat_version_field)) &&
72 version <= c->sb.version_incompat_allowed)
73 ? 0
74 : -BCH_ERR_may_not_use_incompat_feature;
75
76 if (!ret) {
77 mutex_lock(&c->sb_lock);
78 SET_BCH_SB_VERSION_INCOMPAT(c->disk_sb.sb,
79 max(BCH_SB_VERSION_INCOMPAT(c->disk_sb.sb), version));
80 bch2_write_super(c);
81 mutex_unlock(&c->sb_lock);
82 }
83
84 return ret;
85 }
86
87 const char * const bch2_sb_fields[] = {
88 #define x(name, nr) #name,
89 BCH_SB_FIELDS()
90 #undef x
91 NULL
92 };
93
94 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
95 enum bch_validate_flags, struct printbuf *);
96
bch2_sb_field_get_id(struct bch_sb * sb,enum bch_sb_field_type type)97 struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
98 enum bch_sb_field_type type)
99 {
100 /* XXX: need locking around superblock to access optional fields */
101
102 vstruct_for_each(sb, f)
103 if (le32_to_cpu(f->type) == type)
104 return f;
105 return NULL;
106 }
107
__bch2_sb_field_resize(struct bch_sb_handle * sb,struct bch_sb_field * f,unsigned u64s)108 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
109 struct bch_sb_field *f,
110 unsigned u64s)
111 {
112 unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
113 unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
114
115 BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
116
117 if (!f && !u64s) {
118 /* nothing to do: */
119 } else if (!f) {
120 f = vstruct_last(sb->sb);
121 memset(f, 0, sizeof(u64) * u64s);
122 f->u64s = cpu_to_le32(u64s);
123 f->type = 0;
124 } else {
125 void *src, *dst;
126
127 src = vstruct_end(f);
128
129 if (u64s) {
130 f->u64s = cpu_to_le32(u64s);
131 dst = vstruct_end(f);
132 } else {
133 dst = f;
134 }
135
136 memmove(dst, src, vstruct_end(sb->sb) - src);
137
138 if (dst > src)
139 memset(src, 0, dst - src);
140 }
141
142 sb->sb->u64s = cpu_to_le32(sb_u64s);
143
144 return u64s ? f : NULL;
145 }
146
bch2_sb_field_delete(struct bch_sb_handle * sb,enum bch_sb_field_type type)147 void bch2_sb_field_delete(struct bch_sb_handle *sb,
148 enum bch_sb_field_type type)
149 {
150 struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
151
152 if (f)
153 __bch2_sb_field_resize(sb, f, 0);
154 }
155
156 /* Superblock realloc/free: */
157
bch2_free_super(struct bch_sb_handle * sb)158 void bch2_free_super(struct bch_sb_handle *sb)
159 {
160 kfree(sb->bio);
161 if (!IS_ERR_OR_NULL(sb->s_bdev_file))
162 bdev_fput(sb->s_bdev_file);
163 kfree(sb->holder);
164 kfree(sb->sb_name);
165
166 kfree(sb->sb);
167 memset(sb, 0, sizeof(*sb));
168 }
169
bch2_sb_realloc(struct bch_sb_handle * sb,unsigned u64s)170 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
171 {
172 size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
173 size_t new_buffer_size;
174 struct bch_sb *new_sb;
175 struct bio *bio;
176
177 if (sb->bdev)
178 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
179
180 new_buffer_size = roundup_pow_of_two(new_bytes);
181
182 if (sb->sb && sb->buffer_size >= new_buffer_size)
183 return 0;
184
185 if (sb->sb && sb->have_layout) {
186 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
187
188 if (new_bytes > max_bytes) {
189 struct printbuf buf = PRINTBUF;
190
191 prt_bdevname(&buf, sb->bdev);
192 prt_printf(&buf, ": superblock too big: want %zu but have %llu", new_bytes, max_bytes);
193 pr_err("%s", buf.buf);
194 printbuf_exit(&buf);
195 return -BCH_ERR_ENOSPC_sb;
196 }
197 }
198
199 if (sb->buffer_size >= new_buffer_size && sb->sb)
200 return 0;
201
202 if (dynamic_fault("bcachefs:add:super_realloc"))
203 return -BCH_ERR_ENOMEM_sb_realloc_injected;
204
205 new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
206 if (!new_sb)
207 return -BCH_ERR_ENOMEM_sb_buf_realloc;
208
209 sb->sb = new_sb;
210
211 if (sb->have_bio) {
212 unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
213
214 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
215 if (!bio)
216 return -BCH_ERR_ENOMEM_sb_bio_realloc;
217
218 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
219
220 kfree(sb->bio);
221 sb->bio = bio;
222 }
223
224 sb->buffer_size = new_buffer_size;
225
226 return 0;
227 }
228
bch2_sb_field_resize_id(struct bch_sb_handle * sb,enum bch_sb_field_type type,unsigned u64s)229 struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb,
230 enum bch_sb_field_type type,
231 unsigned u64s)
232 {
233 struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
234 ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
235 ssize_t d = -old_u64s + u64s;
236
237 if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
238 return NULL;
239
240 if (sb->fs_sb) {
241 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
242
243 lockdep_assert_held(&c->sb_lock);
244
245 /* XXX: we're not checking that offline device have enough space */
246
247 for_each_online_member(c, ca) {
248 struct bch_sb_handle *dev_sb = &ca->disk_sb;
249
250 if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
251 percpu_ref_put(&ca->io_ref);
252 return NULL;
253 }
254 }
255 }
256
257 f = bch2_sb_field_get_id(sb->sb, type);
258 f = __bch2_sb_field_resize(sb, f, u64s);
259 if (f)
260 f->type = cpu_to_le32(type);
261 return f;
262 }
263
bch2_sb_field_get_minsize_id(struct bch_sb_handle * sb,enum bch_sb_field_type type,unsigned u64s)264 struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *sb,
265 enum bch_sb_field_type type,
266 unsigned u64s)
267 {
268 struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
269
270 if (!f || le32_to_cpu(f->u64s) < u64s)
271 f = bch2_sb_field_resize_id(sb, type, u64s);
272 return f;
273 }
274
275 /* Superblock validate: */
276
validate_sb_layout(struct bch_sb_layout * layout,struct printbuf * out)277 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
278 {
279 u64 offset, prev_offset, max_sectors;
280 unsigned i;
281
282 BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
283
284 if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
285 !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
286 prt_printf(out, "Not a bcachefs superblock layout");
287 return -BCH_ERR_invalid_sb_layout;
288 }
289
290 if (layout->layout_type != 0) {
291 prt_printf(out, "Invalid superblock layout type %u",
292 layout->layout_type);
293 return -BCH_ERR_invalid_sb_layout_type;
294 }
295
296 if (!layout->nr_superblocks) {
297 prt_printf(out, "Invalid superblock layout: no superblocks");
298 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
299 }
300
301 if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
302 prt_printf(out, "Invalid superblock layout: too many superblocks");
303 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
304 }
305
306 if (layout->sb_max_size_bits > BCH_SB_LAYOUT_SIZE_BITS_MAX) {
307 prt_printf(out, "Invalid superblock layout: max_size_bits too high");
308 return -BCH_ERR_invalid_sb_layout_sb_max_size_bits;
309 }
310
311 max_sectors = 1 << layout->sb_max_size_bits;
312
313 prev_offset = le64_to_cpu(layout->sb_offset[0]);
314
315 for (i = 1; i < layout->nr_superblocks; i++) {
316 offset = le64_to_cpu(layout->sb_offset[i]);
317
318 if (offset < prev_offset + max_sectors) {
319 prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
320 " (sb %u ends at %llu next starts at %llu",
321 i - 1, prev_offset + max_sectors, offset);
322 return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
323 }
324 prev_offset = offset;
325 }
326
327 return 0;
328 }
329
bch2_sb_compatible(struct bch_sb * sb,struct printbuf * out)330 static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
331 {
332 u16 version = le16_to_cpu(sb->version);
333 u16 version_min = le16_to_cpu(sb->version_min);
334
335 if (!bch2_version_compatible(version)) {
336 prt_str(out, "Unsupported superblock version ");
337 bch2_version_to_text(out, version);
338 prt_str(out, " (min ");
339 bch2_version_to_text(out, bcachefs_metadata_version_min);
340 prt_str(out, ", max ");
341 bch2_version_to_text(out, bcachefs_metadata_version_current);
342 prt_str(out, ")");
343 return -BCH_ERR_invalid_sb_version;
344 }
345
346 if (!bch2_version_compatible(version_min)) {
347 prt_str(out, "Unsupported superblock version_min ");
348 bch2_version_to_text(out, version_min);
349 prt_str(out, " (min ");
350 bch2_version_to_text(out, bcachefs_metadata_version_min);
351 prt_str(out, ", max ");
352 bch2_version_to_text(out, bcachefs_metadata_version_current);
353 prt_str(out, ")");
354 return -BCH_ERR_invalid_sb_version;
355 }
356
357 if (version_min > version) {
358 prt_str(out, "Bad minimum version ");
359 bch2_version_to_text(out, version_min);
360 prt_str(out, ", greater than version field ");
361 bch2_version_to_text(out, version);
362 return -BCH_ERR_invalid_sb_version;
363 }
364
365 return 0;
366 }
367
bch2_sb_validate(struct bch_sb * sb,u64 read_offset,enum bch_validate_flags flags,struct printbuf * out)368 int bch2_sb_validate(struct bch_sb *sb, u64 read_offset,
369 enum bch_validate_flags flags, struct printbuf *out)
370 {
371 struct bch_sb_field_members_v1 *mi;
372 enum bch_opt_id opt_id;
373 int ret;
374
375 ret = bch2_sb_compatible(sb, out);
376 if (ret)
377 return ret;
378
379 u64 incompat = le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR);
380 unsigned incompat_bit = 0;
381 if (incompat)
382 incompat_bit = __ffs64(incompat);
383 else if (sb->features[1])
384 incompat_bit = 64 + __ffs64(le64_to_cpu(sb->features[1]));
385
386 if (incompat_bit) {
387 prt_printf(out, "Filesystem has incompatible feature bit %u, highest supported %s (%u)",
388 incompat_bit,
389 bch2_sb_features[BCH_FEATURE_NR - 1],
390 BCH_FEATURE_NR - 1);
391 return -BCH_ERR_invalid_sb_features;
392 }
393
394 if (BCH_VERSION_MAJOR(le16_to_cpu(sb->version)) > BCH_VERSION_MAJOR(bcachefs_metadata_version_current) ||
395 BCH_SB_VERSION_INCOMPAT(sb) > bcachefs_metadata_version_current) {
396 prt_str(out, "Filesystem has incompatible version ");
397 bch2_version_to_text(out, le16_to_cpu(sb->version));
398 prt_str(out, ", current version ");
399 bch2_version_to_text(out, bcachefs_metadata_version_current);
400 return -BCH_ERR_invalid_sb_features;
401 }
402
403 if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
404 prt_printf(out, "Bad user UUID (got zeroes)");
405 return -BCH_ERR_invalid_sb_uuid;
406 }
407
408 if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
409 prt_printf(out, "Bad internal UUID (got zeroes)");
410 return -BCH_ERR_invalid_sb_uuid;
411 }
412
413 if (!(flags & BCH_VALIDATE_write) &&
414 le64_to_cpu(sb->offset) != read_offset) {
415 prt_printf(out, "Bad sb offset (got %llu, read from %llu)",
416 le64_to_cpu(sb->offset), read_offset);
417 return -BCH_ERR_invalid_sb_offset;
418 }
419
420 if (!sb->nr_devices ||
421 sb->nr_devices > BCH_SB_MEMBERS_MAX) {
422 prt_printf(out, "Bad number of member devices %u (max %u)",
423 sb->nr_devices, BCH_SB_MEMBERS_MAX);
424 return -BCH_ERR_invalid_sb_too_many_members;
425 }
426
427 if (sb->dev_idx >= sb->nr_devices) {
428 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
429 sb->dev_idx, sb->nr_devices);
430 return -BCH_ERR_invalid_sb_dev_idx;
431 }
432
433 if (!sb->time_precision ||
434 le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
435 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
436 le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
437 return -BCH_ERR_invalid_sb_time_precision;
438 }
439
440 /* old versions didn't know to downgrade this field */
441 if (BCH_SB_VERSION_INCOMPAT_ALLOWED(sb) > le16_to_cpu(sb->version))
442 SET_BCH_SB_VERSION_INCOMPAT_ALLOWED(sb, le16_to_cpu(sb->version));
443
444 if (BCH_SB_VERSION_INCOMPAT(sb) > BCH_SB_VERSION_INCOMPAT_ALLOWED(sb)) {
445 prt_printf(out, "Invalid version_incompat ");
446 bch2_version_to_text(out, BCH_SB_VERSION_INCOMPAT(sb));
447 prt_str(out, " > incompat_allowed ");
448 bch2_version_to_text(out, BCH_SB_VERSION_INCOMPAT_ALLOWED(sb));
449 if (flags & BCH_VALIDATE_write)
450 return -BCH_ERR_invalid_sb_version;
451 else
452 SET_BCH_SB_VERSION_INCOMPAT_ALLOWED(sb, BCH_SB_VERSION_INCOMPAT(sb));
453 }
454
455 if (!flags) {
456 /*
457 * Been seeing a bug where these are getting inexplicably
458 * zeroed, so we're now validating them, but we have to be
459 * careful not to preven people's filesystems from mounting:
460 */
461 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
462 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
463 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
464 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
465
466 if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
467 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
468
469 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_disk_accounting_v2 &&
470 !BCH_SB_ALLOCATOR_STUCK_TIMEOUT(sb))
471 SET_BCH_SB_ALLOCATOR_STUCK_TIMEOUT(sb, 30);
472
473 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_disk_accounting_v2)
474 SET_BCH_SB_PROMOTE_WHOLE_EXTENTS(sb, true);
475
476 if (!BCH_SB_WRITE_ERROR_TIMEOUT(sb))
477 SET_BCH_SB_WRITE_ERROR_TIMEOUT(sb, 30);
478
479 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_extent_flags &&
480 !BCH_SB_CSUM_ERR_RETRY_NR(sb))
481 SET_BCH_SB_CSUM_ERR_RETRY_NR(sb, 3);
482 }
483
484 #ifdef __KERNEL__
485 if (!BCH_SB_SHARD_INUMS_NBITS(sb))
486 SET_BCH_SB_SHARD_INUMS_NBITS(sb, ilog2(roundup_pow_of_two(num_online_cpus())));
487 #endif
488
489 for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
490 const struct bch_option *opt = bch2_opt_table + opt_id;
491
492 if (opt->get_sb) {
493 u64 v = bch2_opt_from_sb(sb, opt_id, -1);
494
495 prt_printf(out, "Invalid option ");
496 ret = bch2_opt_validate(opt, v, out);
497 if (ret)
498 return ret;
499
500 printbuf_reset(out);
501 }
502 }
503
504 /* validate layout */
505 ret = validate_sb_layout(&sb->layout, out);
506 if (ret)
507 return ret;
508
509 vstruct_for_each(sb, f) {
510 if (!f->u64s) {
511 prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
512 le32_to_cpu(f->type));
513 return -BCH_ERR_invalid_sb_field_size;
514 }
515
516 if (vstruct_next(f) > vstruct_last(sb)) {
517 prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
518 le32_to_cpu(f->type));
519 return -BCH_ERR_invalid_sb_field_size;
520 }
521 }
522
523 /* members must be validated first: */
524 mi = bch2_sb_field_get(sb, members_v1);
525 if (!mi) {
526 prt_printf(out, "Invalid superblock: member info area missing");
527 return -BCH_ERR_invalid_sb_members_missing;
528 }
529
530 ret = bch2_sb_field_validate(sb, &mi->field, flags, out);
531 if (ret)
532 return ret;
533
534 vstruct_for_each(sb, f) {
535 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
536 continue;
537
538 ret = bch2_sb_field_validate(sb, f, flags, out);
539 if (ret)
540 return ret;
541 }
542
543 if ((flags & BCH_VALIDATE_write) &&
544 bch2_sb_member_get(sb, sb->dev_idx).seq != sb->seq) {
545 prt_printf(out, "Invalid superblock: member seq %llu != sb seq %llu",
546 le64_to_cpu(bch2_sb_member_get(sb, sb->dev_idx).seq),
547 le64_to_cpu(sb->seq));
548 return -BCH_ERR_invalid_sb_members_missing;
549 }
550
551 return 0;
552 }
553
554 /* device open: */
555
le_ulong_to_cpu(unsigned long v)556 static unsigned long le_ulong_to_cpu(unsigned long v)
557 {
558 return sizeof(unsigned long) == 8
559 ? le64_to_cpu(v)
560 : le32_to_cpu(v);
561 }
562
le_bitvector_to_cpu(unsigned long * dst,unsigned long * src,unsigned nr)563 static void le_bitvector_to_cpu(unsigned long *dst, unsigned long *src, unsigned nr)
564 {
565 BUG_ON(nr & (BITS_PER_TYPE(long) - 1));
566
567 for (unsigned i = 0; i < BITS_TO_LONGS(nr); i++)
568 dst[i] = le_ulong_to_cpu(src[i]);
569 }
570
bch2_sb_update(struct bch_fs * c)571 static void bch2_sb_update(struct bch_fs *c)
572 {
573 struct bch_sb *src = c->disk_sb.sb;
574
575 lockdep_assert_held(&c->sb_lock);
576
577 c->sb.uuid = src->uuid;
578 c->sb.user_uuid = src->user_uuid;
579 c->sb.version = le16_to_cpu(src->version);
580 c->sb.version_incompat = BCH_SB_VERSION_INCOMPAT(src);
581 c->sb.version_incompat_allowed
582 = BCH_SB_VERSION_INCOMPAT_ALLOWED(src);
583 c->sb.version_min = le16_to_cpu(src->version_min);
584 c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
585 c->sb.nr_devices = src->nr_devices;
586 c->sb.clean = BCH_SB_CLEAN(src);
587 c->sb.encryption_type = BCH_SB_ENCRYPTION_TYPE(src);
588
589 c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
590 c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
591
592 /* XXX this is wrong, we need a 96 or 128 bit integer type */
593 c->sb.time_base_lo = div_u64(le64_to_cpu(src->time_base_lo),
594 c->sb.nsec_per_time_unit);
595 c->sb.time_base_hi = le32_to_cpu(src->time_base_hi);
596
597 c->sb.features = le64_to_cpu(src->features[0]);
598 c->sb.compat = le64_to_cpu(src->compat[0]);
599
600 memset(c->sb.errors_silent, 0, sizeof(c->sb.errors_silent));
601
602 struct bch_sb_field_ext *ext = bch2_sb_field_get(src, ext);
603 if (ext) {
604 le_bitvector_to_cpu(c->sb.errors_silent, (void *) ext->errors_silent,
605 sizeof(c->sb.errors_silent) * 8);
606 c->sb.btrees_lost_data = le64_to_cpu(ext->btrees_lost_data);
607 }
608
609 for_each_member_device(c, ca) {
610 struct bch_member m = bch2_sb_member_get(src, ca->dev_idx);
611 ca->mi = bch2_mi_to_cpu(&m);
612 }
613 }
614
__copy_super(struct bch_sb_handle * dst_handle,struct bch_sb * src)615 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
616 {
617 struct bch_sb_field *src_f, *dst_f;
618 struct bch_sb *dst = dst_handle->sb;
619 unsigned i;
620
621 dst->version = src->version;
622 dst->version_min = src->version_min;
623 dst->seq = src->seq;
624 dst->uuid = src->uuid;
625 dst->user_uuid = src->user_uuid;
626 memcpy(dst->label, src->label, sizeof(dst->label));
627
628 dst->block_size = src->block_size;
629 dst->nr_devices = src->nr_devices;
630
631 dst->time_base_lo = src->time_base_lo;
632 dst->time_base_hi = src->time_base_hi;
633 dst->time_precision = src->time_precision;
634 dst->write_time = src->write_time;
635
636 memcpy(dst->flags, src->flags, sizeof(dst->flags));
637 memcpy(dst->features, src->features, sizeof(dst->features));
638 memcpy(dst->compat, src->compat, sizeof(dst->compat));
639
640 for (i = 0; i < BCH_SB_FIELD_NR; i++) {
641 int d;
642
643 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
644 continue;
645
646 src_f = bch2_sb_field_get_id(src, i);
647 dst_f = bch2_sb_field_get_id(dst, i);
648
649 d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
650 (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
651 if (d > 0) {
652 int ret = bch2_sb_realloc(dst_handle,
653 le32_to_cpu(dst_handle->sb->u64s) + d);
654
655 if (ret)
656 return ret;
657
658 dst = dst_handle->sb;
659 dst_f = bch2_sb_field_get_id(dst, i);
660 }
661
662 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
663 src_f ? le32_to_cpu(src_f->u64s) : 0);
664
665 if (src_f)
666 memcpy(dst_f, src_f, vstruct_bytes(src_f));
667 }
668
669 return 0;
670 }
671
bch2_sb_to_fs(struct bch_fs * c,struct bch_sb * src)672 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
673 {
674 int ret;
675
676 lockdep_assert_held(&c->sb_lock);
677
678 ret = bch2_sb_realloc(&c->disk_sb, 0) ?:
679 __copy_super(&c->disk_sb, src) ?:
680 bch2_sb_replicas_to_cpu_replicas(c) ?:
681 bch2_sb_disk_groups_to_cpu(c);
682 if (ret)
683 return ret;
684
685 bch2_sb_update(c);
686 return 0;
687 }
688
bch2_sb_from_fs(struct bch_fs * c,struct bch_dev * ca)689 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
690 {
691 return __copy_super(&ca->disk_sb, c->disk_sb.sb);
692 }
693
694 /* read superblock: */
695
read_one_super(struct bch_sb_handle * sb,u64 offset,struct printbuf * err)696 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
697 {
698 size_t bytes;
699 int ret;
700 reread:
701 bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
702 sb->bio->bi_iter.bi_sector = offset;
703 bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
704
705 ret = submit_bio_wait(sb->bio);
706 if (ret) {
707 prt_printf(err, "IO error: %i", ret);
708 return ret;
709 }
710
711 if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
712 !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
713 prt_str(err, "Not a bcachefs superblock (got magic ");
714 pr_uuid(err, sb->sb->magic.b);
715 prt_str(err, ")");
716 return -BCH_ERR_invalid_sb_magic;
717 }
718
719 ret = bch2_sb_compatible(sb->sb, err);
720 if (ret)
721 return ret;
722
723 bytes = vstruct_bytes(sb->sb);
724
725 u64 sb_size = 512ULL << min(BCH_SB_LAYOUT_SIZE_BITS_MAX, sb->sb->layout.sb_max_size_bits);
726 if (bytes > sb_size) {
727 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %llu)",
728 bytes, sb_size);
729 return -BCH_ERR_invalid_sb_too_big;
730 }
731
732 if (bytes > sb->buffer_size) {
733 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
734 if (ret)
735 return ret;
736 goto reread;
737 }
738
739 enum bch_csum_type csum_type = BCH_SB_CSUM_TYPE(sb->sb);
740 if (csum_type >= BCH_CSUM_NR ||
741 bch2_csum_type_is_encryption(csum_type)) {
742 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
743 return -BCH_ERR_invalid_sb_csum_type;
744 }
745
746 /* XXX: verify MACs */
747 struct bch_csum csum = csum_vstruct(NULL, csum_type, null_nonce(), sb->sb);
748 if (bch2_crc_cmp(csum, sb->sb->csum)) {
749 bch2_csum_err_msg(err, csum_type, sb->sb->csum, csum);
750 return -BCH_ERR_invalid_sb_csum;
751 }
752
753 sb->seq = le64_to_cpu(sb->sb->seq);
754
755 return 0;
756 }
757
__bch2_read_super(const char * path,struct bch_opts * opts,struct bch_sb_handle * sb,bool ignore_notbchfs_msg)758 static int __bch2_read_super(const char *path, struct bch_opts *opts,
759 struct bch_sb_handle *sb, bool ignore_notbchfs_msg)
760 {
761 u64 offset = opt_get(*opts, sb);
762 struct bch_sb_layout layout;
763 struct printbuf err = PRINTBUF;
764 struct printbuf err2 = PRINTBUF;
765 __le64 *i;
766 int ret;
767 #ifndef __KERNEL__
768 retry:
769 #endif
770 memset(sb, 0, sizeof(*sb));
771 sb->mode = BLK_OPEN_READ;
772 sb->have_bio = true;
773 sb->holder = kzalloc(sizeof(*sb->holder), GFP_KERNEL);
774 if (!sb->holder)
775 return -ENOMEM;
776
777 sb->sb_name = kstrdup(path, GFP_KERNEL);
778 if (!sb->sb_name) {
779 ret = -ENOMEM;
780 prt_printf(&err, "error allocating memory for sb_name");
781 goto err;
782 }
783
784 #ifndef __KERNEL__
785 if (opt_get(*opts, direct_io) == false)
786 sb->mode |= BLK_OPEN_BUFFERED;
787 #endif
788
789 if (!opt_get(*opts, noexcl))
790 sb->mode |= BLK_OPEN_EXCL;
791
792 if (!opt_get(*opts, nochanges))
793 sb->mode |= BLK_OPEN_WRITE;
794
795 sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
796 if (IS_ERR(sb->s_bdev_file) &&
797 PTR_ERR(sb->s_bdev_file) == -EACCES &&
798 opt_get(*opts, read_only)) {
799 sb->mode &= ~BLK_OPEN_WRITE;
800
801 sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
802 if (!IS_ERR(sb->s_bdev_file))
803 opt_set(*opts, nochanges, true);
804 }
805
806 if (IS_ERR(sb->s_bdev_file)) {
807 ret = PTR_ERR(sb->s_bdev_file);
808 prt_printf(&err, "error opening %s: %s", path, bch2_err_str(ret));
809 goto err;
810 }
811 sb->bdev = file_bdev(sb->s_bdev_file);
812
813 ret = bch2_sb_realloc(sb, 0);
814 if (ret) {
815 prt_printf(&err, "error allocating memory for superblock");
816 goto err;
817 }
818
819 if (bch2_fs_init_fault("read_super")) {
820 prt_printf(&err, "dynamic fault");
821 ret = -EFAULT;
822 goto err;
823 }
824
825 ret = read_one_super(sb, offset, &err);
826 if (!ret)
827 goto got_super;
828
829 if (opt_defined(*opts, sb))
830 goto err;
831
832 prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n",
833 path, err.buf);
834 if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg)
835 bch2_print_opts(opts, KERN_INFO "%s", err2.buf);
836 else
837 bch2_print_opts(opts, KERN_ERR "%s", err2.buf);
838
839 printbuf_exit(&err2);
840 printbuf_reset(&err);
841
842 /*
843 * Error reading primary superblock - read location of backup
844 * superblocks:
845 */
846 bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
847 sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
848 /*
849 * use sb buffer to read layout, since sb buffer is page aligned but
850 * layout won't be:
851 */
852 bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
853
854 ret = submit_bio_wait(sb->bio);
855 if (ret) {
856 prt_printf(&err, "IO error: %i", ret);
857 goto err;
858 }
859
860 memcpy(&layout, sb->sb, sizeof(layout));
861 ret = validate_sb_layout(&layout, &err);
862 if (ret)
863 goto err;
864
865 for (i = layout.sb_offset;
866 i < layout.sb_offset + layout.nr_superblocks; i++) {
867 offset = le64_to_cpu(*i);
868
869 if (offset == opt_get(*opts, sb)) {
870 ret = -BCH_ERR_invalid;
871 continue;
872 }
873
874 ret = read_one_super(sb, offset, &err);
875 if (!ret)
876 goto got_super;
877 }
878
879 goto err;
880
881 got_super:
882 if (le16_to_cpu(sb->sb->block_size) << 9 <
883 bdev_logical_block_size(sb->bdev) &&
884 opt_get(*opts, direct_io)) {
885 #ifndef __KERNEL__
886 opt_set(*opts, direct_io, false);
887 bch2_free_super(sb);
888 goto retry;
889 #endif
890 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
891 le16_to_cpu(sb->sb->block_size) << 9,
892 bdev_logical_block_size(sb->bdev));
893 ret = -BCH_ERR_block_size_too_small;
894 goto err;
895 }
896
897 sb->have_layout = true;
898
899 ret = bch2_sb_validate(sb->sb, offset, 0, &err);
900 if (ret) {
901 bch2_print_opts(opts, KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
902 path, err.buf);
903 goto err_no_print;
904 }
905 out:
906 printbuf_exit(&err);
907 return ret;
908 err:
909 bch2_print_opts(opts, KERN_ERR "bcachefs (%s): error reading superblock: %s\n",
910 path, err.buf);
911 err_no_print:
912 bch2_free_super(sb);
913 goto out;
914 }
915
bch2_read_super(const char * path,struct bch_opts * opts,struct bch_sb_handle * sb)916 int bch2_read_super(const char *path, struct bch_opts *opts,
917 struct bch_sb_handle *sb)
918 {
919 return __bch2_read_super(path, opts, sb, false);
920 }
921
922 /* provide a silenced version for mount.bcachefs */
923
bch2_read_super_silent(const char * path,struct bch_opts * opts,struct bch_sb_handle * sb)924 int bch2_read_super_silent(const char *path, struct bch_opts *opts,
925 struct bch_sb_handle *sb)
926 {
927 return __bch2_read_super(path, opts, sb, true);
928 }
929
930 /* write superblock: */
931
write_super_endio(struct bio * bio)932 static void write_super_endio(struct bio *bio)
933 {
934 struct bch_dev *ca = bio->bi_private;
935
936 bch2_account_io_success_fail(ca, bio_data_dir(bio), !bio->bi_status);
937
938 /* XXX: return errors directly */
939
940 if (bio->bi_status) {
941 bch_err_dev_ratelimited(ca, "superblock %s error: %s",
942 str_write_read(bio_data_dir(bio)),
943 bch2_blk_status_to_str(bio->bi_status));
944 ca->sb_write_error = 1;
945 }
946
947 closure_put(&ca->fs->sb_write);
948 percpu_ref_put(&ca->io_ref);
949 }
950
read_back_super(struct bch_fs * c,struct bch_dev * ca)951 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
952 {
953 struct bch_sb *sb = ca->disk_sb.sb;
954 struct bio *bio = ca->disk_sb.bio;
955
956 memset(ca->sb_read_scratch, 0, BCH_SB_READ_SCRATCH_BUF_SIZE);
957
958 bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
959 bio->bi_iter.bi_sector = le64_to_cpu(sb->layout.sb_offset[0]);
960 bio->bi_end_io = write_super_endio;
961 bio->bi_private = ca;
962 bch2_bio_map(bio, ca->sb_read_scratch, BCH_SB_READ_SCRATCH_BUF_SIZE);
963
964 this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb], bio_sectors(bio));
965
966 percpu_ref_get(&ca->io_ref);
967 closure_bio_submit(bio, &c->sb_write);
968 }
969
write_one_super(struct bch_fs * c,struct bch_dev * ca,unsigned idx)970 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
971 {
972 struct bch_sb *sb = ca->disk_sb.sb;
973 struct bio *bio = ca->disk_sb.bio;
974
975 sb->offset = sb->layout.sb_offset[idx];
976
977 SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
978 sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
979 null_nonce(), sb);
980
981 bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
982 bio->bi_iter.bi_sector = le64_to_cpu(sb->offset);
983 bio->bi_end_io = write_super_endio;
984 bio->bi_private = ca;
985 bch2_bio_map(bio, sb,
986 roundup((size_t) vstruct_bytes(sb),
987 bdev_logical_block_size(ca->disk_sb.bdev)));
988
989 this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
990 bio_sectors(bio));
991
992 percpu_ref_get(&ca->io_ref);
993 closure_bio_submit(bio, &c->sb_write);
994 }
995
bch2_write_super(struct bch_fs * c)996 int bch2_write_super(struct bch_fs *c)
997 {
998 struct closure *cl = &c->sb_write;
999 struct printbuf err = PRINTBUF;
1000 unsigned sb = 0, nr_wrote;
1001 struct bch_devs_mask sb_written;
1002 bool wrote, can_mount_without_written, can_mount_with_written;
1003 unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
1004 DARRAY(struct bch_dev *) online_devices = {};
1005 int ret = 0;
1006
1007 trace_and_count(c, write_super, c, _RET_IP_);
1008
1009 if (c->opts.very_degraded)
1010 degraded_flags |= BCH_FORCE_IF_LOST;
1011
1012 lockdep_assert_held(&c->sb_lock);
1013
1014 closure_init_stack(cl);
1015 memset(&sb_written, 0, sizeof(sb_written));
1016
1017 for_each_online_member(c, ca) {
1018 ret = darray_push(&online_devices, ca);
1019 if (bch2_fs_fatal_err_on(ret, c, "%s: error allocating online devices", __func__)) {
1020 percpu_ref_put(&ca->io_ref);
1021 goto out;
1022 }
1023 percpu_ref_get(&ca->io_ref);
1024 }
1025
1026 /* Make sure we're using the new magic numbers: */
1027 c->disk_sb.sb->magic = BCHFS_MAGIC;
1028 c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
1029
1030 le64_add_cpu(&c->disk_sb.sb->seq, 1);
1031
1032 struct bch_sb_field_members_v2 *mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
1033 darray_for_each(online_devices, ca)
1034 __bch2_members_v2_get_mut(mi, (*ca)->dev_idx)->seq = c->disk_sb.sb->seq;
1035 c->disk_sb.sb->write_time = cpu_to_le64(ktime_get_real_seconds());
1036
1037 if (test_bit(BCH_FS_error, &c->flags))
1038 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
1039 if (test_bit(BCH_FS_topology_error, &c->flags))
1040 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
1041
1042 SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
1043
1044 bch2_sb_counters_from_cpu(c);
1045 bch2_sb_members_from_cpu(c);
1046 bch2_sb_members_cpy_v2_v1(&c->disk_sb);
1047 bch2_sb_errors_from_cpu(c);
1048 bch2_sb_downgrade_update(c);
1049
1050 darray_for_each(online_devices, ca)
1051 bch2_sb_from_fs(c, (*ca));
1052
1053 darray_for_each(online_devices, ca) {
1054 printbuf_reset(&err);
1055
1056 ret = bch2_sb_validate((*ca)->disk_sb.sb, 0, BCH_VALIDATE_write, &err);
1057 if (ret) {
1058 bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
1059 goto out;
1060 }
1061 }
1062
1063 if (c->opts.nochanges)
1064 goto out;
1065
1066 /*
1067 * Defer writing the superblock until filesystem initialization is
1068 * complete - don't write out a partly initialized superblock:
1069 */
1070 if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
1071 goto out;
1072
1073 if (le16_to_cpu(c->disk_sb.sb->version) > bcachefs_metadata_version_current) {
1074 struct printbuf buf = PRINTBUF;
1075 prt_printf(&buf, "attempting to write superblock that wasn't version downgraded (");
1076 bch2_version_to_text(&buf, le16_to_cpu(c->disk_sb.sb->version));
1077 prt_str(&buf, " > ");
1078 bch2_version_to_text(&buf, bcachefs_metadata_version_current);
1079 prt_str(&buf, ")");
1080 bch2_fs_fatal_error(c, ": %s", buf.buf);
1081 printbuf_exit(&buf);
1082 return -BCH_ERR_sb_not_downgraded;
1083 }
1084
1085 darray_for_each(online_devices, ca) {
1086 __set_bit((*ca)->dev_idx, sb_written.d);
1087 (*ca)->sb_write_error = 0;
1088 }
1089
1090 darray_for_each(online_devices, ca)
1091 read_back_super(c, *ca);
1092 closure_sync(cl);
1093
1094 darray_for_each(online_devices, cap) {
1095 struct bch_dev *ca = *cap;
1096
1097 if (ca->sb_write_error)
1098 continue;
1099
1100 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
1101 struct printbuf buf = PRINTBUF;
1102 prt_char(&buf, ' ');
1103 prt_bdevname(&buf, ca->disk_sb.bdev);
1104 prt_printf(&buf,
1105 ": Superblock write was silently dropped! (seq %llu expected %llu)",
1106 le64_to_cpu(ca->sb_read_scratch->seq),
1107 ca->disk_sb.seq);
1108
1109 if (c->opts.errors != BCH_ON_ERROR_continue &&
1110 c->opts.errors != BCH_ON_ERROR_fix_safe) {
1111 ret = -BCH_ERR_erofs_sb_err;
1112 bch2_fs_fatal_error(c, "%s", buf.buf);
1113 } else {
1114 bch_err(c, "%s", buf.buf);
1115 }
1116
1117 printbuf_exit(&buf);
1118 }
1119
1120 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
1121 struct printbuf buf = PRINTBUF;
1122 prt_char(&buf, ' ');
1123 prt_bdevname(&buf, ca->disk_sb.bdev);
1124 prt_printf(&buf,
1125 ": Superblock modified by another process (seq %llu expected %llu)",
1126 le64_to_cpu(ca->sb_read_scratch->seq),
1127 ca->disk_sb.seq);
1128 bch2_fs_fatal_error(c, "%s", buf.buf);
1129 printbuf_exit(&buf);
1130 ret = -BCH_ERR_erofs_sb_err;
1131 }
1132 }
1133
1134 if (ret)
1135 goto out;
1136
1137 do {
1138 wrote = false;
1139 darray_for_each(online_devices, cap) {
1140 struct bch_dev *ca = *cap;
1141 if (!ca->sb_write_error &&
1142 sb < ca->disk_sb.sb->layout.nr_superblocks) {
1143 write_one_super(c, ca, sb);
1144 wrote = true;
1145 }
1146 }
1147 closure_sync(cl);
1148 sb++;
1149 } while (wrote);
1150
1151 darray_for_each(online_devices, cap) {
1152 struct bch_dev *ca = *cap;
1153 if (ca->sb_write_error)
1154 __clear_bit(ca->dev_idx, sb_written.d);
1155 else
1156 ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
1157 }
1158
1159 nr_wrote = dev_mask_nr(&sb_written);
1160
1161 can_mount_with_written =
1162 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1163
1164 for (unsigned i = 0; i < ARRAY_SIZE(sb_written.d); i++)
1165 sb_written.d[i] = ~sb_written.d[i];
1166
1167 can_mount_without_written =
1168 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1169
1170 /*
1171 * If we would be able to mount _without_ the devices we successfully
1172 * wrote superblocks to, we weren't able to write to enough devices:
1173 *
1174 * Exception: if we can mount without the successes because we haven't
1175 * written anything (new filesystem), we continue if we'd be able to
1176 * mount with the devices we did successfully write to:
1177 */
1178 if (bch2_fs_fatal_err_on(!nr_wrote ||
1179 !can_mount_with_written ||
1180 (can_mount_without_written &&
1181 !can_mount_with_written), c,
1182 ": Unable to write superblock to sufficient devices (from %ps)",
1183 (void *) _RET_IP_))
1184 ret = -BCH_ERR_erofs_sb_err;
1185 out:
1186 /* Make new options visible after they're persistent: */
1187 bch2_sb_update(c);
1188 darray_for_each(online_devices, ca)
1189 percpu_ref_put(&(*ca)->io_ref);
1190 darray_exit(&online_devices);
1191 printbuf_exit(&err);
1192 return ret;
1193 }
1194
__bch2_check_set_feature(struct bch_fs * c,unsigned feat)1195 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1196 {
1197 mutex_lock(&c->sb_lock);
1198 if (!(c->sb.features & (1ULL << feat))) {
1199 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1200
1201 bch2_write_super(c);
1202 }
1203 mutex_unlock(&c->sb_lock);
1204 }
1205
1206 /* Downgrade if superblock is at a higher version than currently supported: */
bch2_check_version_downgrade(struct bch_fs * c)1207 bool bch2_check_version_downgrade(struct bch_fs *c)
1208 {
1209 bool ret = bcachefs_metadata_version_current < c->sb.version;
1210
1211 lockdep_assert_held(&c->sb_lock);
1212
1213 /*
1214 * Downgrade, if superblock is at a higher version than currently
1215 * supported:
1216 *
1217 * c->sb will be checked before we write the superblock, so update it as
1218 * well:
1219 */
1220 if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
1221 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1222 if (BCH_SB_VERSION_INCOMPAT_ALLOWED(c->disk_sb.sb) > bcachefs_metadata_version_current)
1223 SET_BCH_SB_VERSION_INCOMPAT_ALLOWED(c->disk_sb.sb, bcachefs_metadata_version_current);
1224 if (c->sb.version > bcachefs_metadata_version_current)
1225 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1226 if (c->sb.version_min > bcachefs_metadata_version_current)
1227 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1228 c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1229 return ret;
1230 }
1231
bch2_sb_upgrade(struct bch_fs * c,unsigned new_version,bool incompat)1232 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version, bool incompat)
1233 {
1234 lockdep_assert_held(&c->sb_lock);
1235
1236 if (BCH_VERSION_MAJOR(new_version) >
1237 BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version)))
1238 bch2_sb_field_resize(&c->disk_sb, downgrade, 0);
1239
1240 c->disk_sb.sb->version = cpu_to_le16(new_version);
1241
1242 if (incompat) {
1243 c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1244 SET_BCH_SB_VERSION_INCOMPAT_ALLOWED(c->disk_sb.sb,
1245 max(BCH_SB_VERSION_INCOMPAT_ALLOWED(c->disk_sb.sb), new_version));
1246 }
1247 }
1248
bch2_sb_ext_validate(struct bch_sb * sb,struct bch_sb_field * f,enum bch_validate_flags flags,struct printbuf * err)1249 static int bch2_sb_ext_validate(struct bch_sb *sb, struct bch_sb_field *f,
1250 enum bch_validate_flags flags, struct printbuf *err)
1251 {
1252 if (vstruct_bytes(f) < 88) {
1253 prt_printf(err, "field too small (%zu < %u)", vstruct_bytes(f), 88);
1254 return -BCH_ERR_invalid_sb_ext;
1255 }
1256
1257 return 0;
1258 }
1259
bch2_sb_ext_to_text(struct printbuf * out,struct bch_sb * sb,struct bch_sb_field * f)1260 static void bch2_sb_ext_to_text(struct printbuf *out, struct bch_sb *sb,
1261 struct bch_sb_field *f)
1262 {
1263 struct bch_sb_field_ext *e = field_to_type(f, ext);
1264
1265 prt_printf(out, "Recovery passes required:\t");
1266 prt_bitflags(out, bch2_recovery_passes,
1267 bch2_recovery_passes_from_stable(le64_to_cpu(e->recovery_passes_required[0])));
1268 prt_newline(out);
1269
1270 unsigned long *errors_silent = kmalloc(sizeof(e->errors_silent), GFP_KERNEL);
1271 if (errors_silent) {
1272 le_bitvector_to_cpu(errors_silent, (void *) e->errors_silent, sizeof(e->errors_silent) * 8);
1273
1274 prt_printf(out, "Errors to silently fix:\t");
1275 prt_bitflags_vector(out, bch2_sb_error_strs, errors_silent,
1276 min(BCH_FSCK_ERR_MAX, sizeof(e->errors_silent) * 8));
1277 prt_newline(out);
1278
1279 kfree(errors_silent);
1280 }
1281
1282 prt_printf(out, "Btrees with missing data:\t");
1283 prt_bitflags(out, __bch2_btree_ids, le64_to_cpu(e->btrees_lost_data));
1284 prt_newline(out);
1285 }
1286
1287 static const struct bch_sb_field_ops bch_sb_field_ops_ext = {
1288 .validate = bch2_sb_ext_validate,
1289 .to_text = bch2_sb_ext_to_text,
1290 };
1291
1292 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1293 #define x(f, nr) \
1294 [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1295 BCH_SB_FIELDS()
1296 #undef x
1297 };
1298
1299 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1300
bch2_sb_field_type_ops(unsigned type)1301 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1302 {
1303 return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1304 ? bch2_sb_field_ops[type]
1305 : &bch2_sb_field_null_ops;
1306 }
1307
bch2_sb_field_validate(struct bch_sb * sb,struct bch_sb_field * f,enum bch_validate_flags flags,struct printbuf * err)1308 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1309 enum bch_validate_flags flags, struct printbuf *err)
1310 {
1311 unsigned type = le32_to_cpu(f->type);
1312 struct printbuf field_err = PRINTBUF;
1313 const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1314 int ret;
1315
1316 ret = ops->validate ? ops->validate(sb, f, flags, &field_err) : 0;
1317 if (ret) {
1318 prt_printf(err, "Invalid superblock section %s: %s",
1319 bch2_sb_fields[type], field_err.buf);
1320 prt_newline(err);
1321 bch2_sb_field_to_text(err, sb, f);
1322 }
1323
1324 printbuf_exit(&field_err);
1325 return ret;
1326 }
1327
__bch2_sb_field_to_text(struct printbuf * out,struct bch_sb * sb,struct bch_sb_field * f)1328 void __bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1329 struct bch_sb_field *f)
1330 {
1331 unsigned type = le32_to_cpu(f->type);
1332 const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1333
1334 if (!out->nr_tabstops)
1335 printbuf_tabstop_push(out, 32);
1336
1337 if (ops->to_text)
1338 ops->to_text(out, sb, f);
1339 }
1340
bch2_sb_field_to_text(struct printbuf * out,struct bch_sb * sb,struct bch_sb_field * f)1341 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1342 struct bch_sb_field *f)
1343 {
1344 unsigned type = le32_to_cpu(f->type);
1345
1346 if (type < BCH_SB_FIELD_NR)
1347 prt_printf(out, "%s", bch2_sb_fields[type]);
1348 else
1349 prt_printf(out, "(unknown field %u)", type);
1350
1351 prt_printf(out, " (size %zu):", vstruct_bytes(f));
1352 prt_newline(out);
1353
1354 __bch2_sb_field_to_text(out, sb, f);
1355 }
1356
bch2_sb_layout_to_text(struct printbuf * out,struct bch_sb_layout * l)1357 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1358 {
1359 unsigned i;
1360
1361 prt_printf(out, "Type: %u", l->layout_type);
1362 prt_newline(out);
1363
1364 prt_str(out, "Superblock max size: ");
1365 prt_units_u64(out, 512 << l->sb_max_size_bits);
1366 prt_newline(out);
1367
1368 prt_printf(out, "Nr superblocks: %u", l->nr_superblocks);
1369 prt_newline(out);
1370
1371 prt_str(out, "Offsets: ");
1372 for (i = 0; i < l->nr_superblocks; i++) {
1373 if (i)
1374 prt_str(out, ", ");
1375 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1376 }
1377 prt_newline(out);
1378 }
1379
bch2_sb_to_text(struct printbuf * out,struct bch_sb * sb,bool print_layout,unsigned fields)1380 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1381 bool print_layout, unsigned fields)
1382 {
1383 if (!out->nr_tabstops)
1384 printbuf_tabstop_push(out, 44);
1385
1386 prt_printf(out, "External UUID:\t");
1387 pr_uuid(out, sb->user_uuid.b);
1388 prt_newline(out);
1389
1390 prt_printf(out, "Internal UUID:\t");
1391 pr_uuid(out, sb->uuid.b);
1392 prt_newline(out);
1393
1394 prt_printf(out, "Magic number:\t");
1395 pr_uuid(out, sb->magic.b);
1396 prt_newline(out);
1397
1398 prt_printf(out, "Device index:\t%u\n", sb->dev_idx);
1399
1400 prt_printf(out, "Label:\t");
1401 if (!strlen(sb->label))
1402 prt_printf(out, "(none)");
1403 else
1404 prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1405 prt_newline(out);
1406
1407 prt_printf(out, "Version:\t");
1408 bch2_version_to_text(out, le16_to_cpu(sb->version));
1409 prt_newline(out);
1410
1411 prt_printf(out, "Incompatible features allowed:\t");
1412 bch2_version_to_text(out, BCH_SB_VERSION_INCOMPAT_ALLOWED(sb));
1413 prt_newline(out);
1414
1415 prt_printf(out, "Incompatible features in use:\t");
1416 bch2_version_to_text(out, BCH_SB_VERSION_INCOMPAT(sb));
1417 prt_newline(out);
1418
1419 prt_printf(out, "Version upgrade complete:\t");
1420 bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1421 prt_newline(out);
1422
1423 prt_printf(out, "Oldest version on disk:\t");
1424 bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1425 prt_newline(out);
1426
1427 prt_printf(out, "Created:\t");
1428 if (sb->time_base_lo)
1429 bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1430 else
1431 prt_printf(out, "(not set)");
1432 prt_newline(out);
1433
1434 prt_printf(out, "Sequence number:\t");
1435 prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1436 prt_newline(out);
1437
1438 prt_printf(out, "Time of last write:\t");
1439 bch2_prt_datetime(out, le64_to_cpu(sb->write_time));
1440 prt_newline(out);
1441
1442 prt_printf(out, "Superblock size:\t");
1443 prt_units_u64(out, vstruct_bytes(sb));
1444 prt_str(out, "/");
1445 prt_units_u64(out, 512ULL << sb->layout.sb_max_size_bits);
1446 prt_newline(out);
1447
1448 prt_printf(out, "Clean:\t%llu\n", BCH_SB_CLEAN(sb));
1449 prt_printf(out, "Devices:\t%u\n", bch2_sb_nr_devices(sb));
1450
1451 prt_printf(out, "Sections:\t");
1452 u64 fields_have = 0;
1453 vstruct_for_each(sb, f)
1454 fields_have |= 1 << le32_to_cpu(f->type);
1455 prt_bitflags(out, bch2_sb_fields, fields_have);
1456 prt_newline(out);
1457
1458 prt_printf(out, "Features:\t");
1459 prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1460 prt_newline(out);
1461
1462 prt_printf(out, "Compat features:\t");
1463 prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1464 prt_newline(out);
1465
1466 prt_newline(out);
1467 prt_printf(out, "Options:");
1468 prt_newline(out);
1469 printbuf_indent_add(out, 2);
1470 {
1471 enum bch_opt_id id;
1472
1473 for (id = 0; id < bch2_opts_nr; id++) {
1474 const struct bch_option *opt = bch2_opt_table + id;
1475
1476 if (opt->get_sb) {
1477 u64 v = bch2_opt_from_sb(sb, id, -1);
1478
1479 prt_printf(out, "%s:\t", opt->attr.name);
1480 bch2_opt_to_text(out, NULL, sb, opt, v,
1481 OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1482 prt_newline(out);
1483 }
1484 }
1485 }
1486
1487 printbuf_indent_sub(out, 2);
1488
1489 if (print_layout) {
1490 prt_newline(out);
1491 prt_printf(out, "layout:");
1492 prt_newline(out);
1493 printbuf_indent_add(out, 2);
1494 bch2_sb_layout_to_text(out, &sb->layout);
1495 printbuf_indent_sub(out, 2);
1496 }
1497
1498 vstruct_for_each(sb, f)
1499 if (fields & (1 << le32_to_cpu(f->type))) {
1500 prt_newline(out);
1501 bch2_sb_field_to_text(out, sb, f);
1502 }
1503 }
1504