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Update bcachefs sources to ed2a5f4260 bcachefs: Add a missing bch2_btree_path_travers...
[bcachefs-tools-debian] / libbcachefs / super-io.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "bcachefs.h"
4 #include "btree_update_interior.h"
5 #include "buckets.h"
6 #include "checksum.h"
7 #include "disk_groups.h"
8 #include "ec.h"
9 #include "error.h"
10 #include "io.h"
11 #include "journal.h"
12 #include "journal_io.h"
13 #include "journal_sb.h"
14 #include "journal_seq_blacklist.h"
15 #include "replicas.h"
16 #include "quota.h"
17 #include "super-io.h"
18 #include "super.h"
19 #include "vstructs.h"
20 #include "counters.h"
21
22 #include <linux/backing-dev.h>
23 #include <linux/pretty-printers.h>
24 #include <linux/sort.h>
25
26 #include <trace/events/bcachefs.h>
27
28 const char * const bch2_sb_fields[] = {
29 #define x(name, nr)     #name,
30         BCH_SB_FIELDS()
31 #undef x
32         NULL
33 };
34
35 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
36                                   struct printbuf *);
37
38 struct bch_sb_field *bch2_sb_field_get(struct bch_sb *sb,
39                                       enum bch_sb_field_type type)
40 {
41         struct bch_sb_field *f;
42
43         /* XXX: need locking around superblock to access optional fields */
44
45         vstruct_for_each(sb, f)
46                 if (le32_to_cpu(f->type) == type)
47                         return f;
48         return NULL;
49 }
50
51 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
52                                                    struct bch_sb_field *f,
53                                                    unsigned u64s)
54 {
55         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
56         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
57
58         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
59
60         if (!f && !u64s) {
61                 /* nothing to do: */
62         } else if (!f) {
63                 f = vstruct_last(sb->sb);
64                 memset(f, 0, sizeof(u64) * u64s);
65                 f->u64s = cpu_to_le32(u64s);
66                 f->type = 0;
67         } else {
68                 void *src, *dst;
69
70                 src = vstruct_end(f);
71
72                 if (u64s) {
73                         f->u64s = cpu_to_le32(u64s);
74                         dst = vstruct_end(f);
75                 } else {
76                         dst = f;
77                 }
78
79                 memmove(dst, src, vstruct_end(sb->sb) - src);
80
81                 if (dst > src)
82                         memset(src, 0, dst - src);
83         }
84
85         sb->sb->u64s = cpu_to_le32(sb_u64s);
86
87         return u64s ? f : NULL;
88 }
89
90 void bch2_sb_field_delete(struct bch_sb_handle *sb,
91                           enum bch_sb_field_type type)
92 {
93         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
94
95         if (f)
96                 __bch2_sb_field_resize(sb, f, 0);
97 }
98
99 /* Superblock realloc/free: */
100
101 void bch2_free_super(struct bch_sb_handle *sb)
102 {
103         kfree(sb->bio);
104         if (!IS_ERR_OR_NULL(sb->bdev))
105                 blkdev_put(sb->bdev, sb->mode);
106
107         kfree(sb->sb);
108         memset(sb, 0, sizeof(*sb));
109 }
110
111 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
112 {
113         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
114         size_t new_buffer_size;
115         struct bch_sb *new_sb;
116         struct bio *bio;
117
118         if (sb->bdev)
119                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
120
121         new_buffer_size = roundup_pow_of_two(new_bytes);
122
123         if (sb->sb && sb->buffer_size >= new_buffer_size)
124                 return 0;
125
126         if (sb->have_layout) {
127                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
128
129                 if (new_bytes > max_bytes) {
130                         pr_err("%pg: superblock too big: want %zu but have %llu",
131                                sb->bdev, new_bytes, max_bytes);
132                         return -BCH_ERR_ENOSPC_sb;
133                 }
134         }
135
136         if (sb->buffer_size >= new_buffer_size && sb->sb)
137                 return 0;
138
139         if (dynamic_fault("bcachefs:add:super_realloc"))
140                 return -ENOMEM;
141
142         if (sb->have_bio) {
143                 unsigned nr_bvecs = DIV_ROUND_UP(new_buffer_size, PAGE_SIZE);
144
145                 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
146                 if (!bio)
147                         return -ENOMEM;
148
149                 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
150
151                 kfree(sb->bio);
152                 sb->bio = bio;
153         }
154
155         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
156         if (!new_sb)
157                 return -ENOMEM;
158
159         sb->sb = new_sb;
160         sb->buffer_size = new_buffer_size;
161
162         return 0;
163 }
164
165 struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
166                                           enum bch_sb_field_type type,
167                                           unsigned u64s)
168 {
169         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
170         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
171         ssize_t d = -old_u64s + u64s;
172
173         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
174                 return NULL;
175
176         if (sb->fs_sb) {
177                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
178                 struct bch_dev *ca;
179                 unsigned i;
180
181                 lockdep_assert_held(&c->sb_lock);
182
183                 /* XXX: we're not checking that offline device have enough space */
184
185                 for_each_online_member(ca, c, i) {
186                         struct bch_sb_handle *sb = &ca->disk_sb;
187
188                         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d)) {
189                                 percpu_ref_put(&ca->ref);
190                                 return NULL;
191                         }
192                 }
193         }
194
195         f = bch2_sb_field_get(sb->sb, type);
196         f = __bch2_sb_field_resize(sb, f, u64s);
197         if (f)
198                 f->type = cpu_to_le32(type);
199         return f;
200 }
201
202 /* Superblock validate: */
203
204 static inline void __bch2_sb_layout_size_assert(void)
205 {
206         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
207 }
208
209 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
210 {
211         u64 offset, prev_offset, max_sectors;
212         unsigned i;
213
214         if (uuid_le_cmp(layout->magic, BCACHE_MAGIC) &&
215             uuid_le_cmp(layout->magic, BCHFS_MAGIC)) {
216                 prt_printf(out, "Not a bcachefs superblock layout");
217                 return -BCH_ERR_invalid_sb_layout;
218         }
219
220         if (layout->layout_type != 0) {
221                 prt_printf(out, "Invalid superblock layout type %u",
222                        layout->layout_type);
223                 return -BCH_ERR_invalid_sb_layout_type;
224         }
225
226         if (!layout->nr_superblocks) {
227                 prt_printf(out, "Invalid superblock layout: no superblocks");
228                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
229         }
230
231         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
232                 prt_printf(out, "Invalid superblock layout: too many superblocks");
233                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
234         }
235
236         max_sectors = 1 << layout->sb_max_size_bits;
237
238         prev_offset = le64_to_cpu(layout->sb_offset[0]);
239
240         for (i = 1; i < layout->nr_superblocks; i++) {
241                 offset = le64_to_cpu(layout->sb_offset[i]);
242
243                 if (offset < prev_offset + max_sectors) {
244                         prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
245                                "  (sb %u ends at %llu next starts at %llu",
246                                i - 1, prev_offset + max_sectors, offset);
247                         return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
248                 }
249                 prev_offset = offset;
250         }
251
252         return 0;
253 }
254
255 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
256                             int rw)
257 {
258         struct bch_sb *sb = disk_sb->sb;
259         struct bch_sb_field *f;
260         struct bch_sb_field_members *mi;
261         enum bch_opt_id opt_id;
262         u32 version, version_min;
263         u16 block_size;
264         int ret;
265
266         version         = le16_to_cpu(sb->version);
267         version_min     = version >= bcachefs_metadata_version_bkey_renumber
268                 ? le16_to_cpu(sb->version_min)
269                 : version;
270
271         if (version    >= bcachefs_metadata_version_max) {
272                 prt_printf(out, "Unsupported superblock version %u (min %u, max %u)",
273                        version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
274                 return -BCH_ERR_invalid_sb_version;
275         }
276
277         if (version_min < bcachefs_metadata_version_min) {
278                 prt_printf(out, "Unsupported superblock version %u (min %u, max %u)",
279                        version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
280                 return -BCH_ERR_invalid_sb_version;
281         }
282
283         if (version_min > version) {
284                 prt_printf(out, "Bad minimum version %u, greater than version field %u",
285                        version_min, version);
286                 return -BCH_ERR_invalid_sb_version;
287         }
288
289         if (sb->features[1] ||
290             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
291                 prt_printf(out, "Filesystem has incompatible features");
292                 return -BCH_ERR_invalid_sb_features;
293         }
294
295         block_size = le16_to_cpu(sb->block_size);
296
297         if (block_size > PAGE_SECTORS) {
298                 prt_printf(out, "Block size too big (got %u, max %u)",
299                        block_size, PAGE_SECTORS);
300                 return -BCH_ERR_invalid_sb_block_size;
301         }
302
303         if (bch2_is_zero(sb->user_uuid.b, sizeof(uuid_le))) {
304                 prt_printf(out, "Bad user UUID (got zeroes)");
305                 return -BCH_ERR_invalid_sb_uuid;
306         }
307
308         if (bch2_is_zero(sb->uuid.b, sizeof(uuid_le))) {
309                 prt_printf(out, "Bad intenal UUID (got zeroes)");
310                 return -BCH_ERR_invalid_sb_uuid;
311         }
312
313         if (!sb->nr_devices ||
314             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
315                 prt_printf(out, "Bad number of member devices %u (max %u)",
316                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
317                 return -BCH_ERR_invalid_sb_too_many_members;
318         }
319
320         if (sb->dev_idx >= sb->nr_devices) {
321                 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
322                        sb->dev_idx, sb->nr_devices);
323                 return -BCH_ERR_invalid_sb_dev_idx;
324         }
325
326         if (!sb->time_precision ||
327             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
328                 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
329                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
330                 return -BCH_ERR_invalid_sb_time_precision;
331         }
332
333         if (rw == READ) {
334                 /*
335                  * Been seeing a bug where these are getting inexplicably
336                  * zeroed, so we'r now validating them, but we have to be
337                  * careful not to preven people's filesystems from mounting:
338                  */
339                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
340                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
341                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
342                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
343         }
344
345         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
346                 const struct bch_option *opt = bch2_opt_table + opt_id;
347
348                 if (opt->get_sb != BCH2_NO_SB_OPT) {
349                         u64 v = bch2_opt_from_sb(sb, opt_id);
350
351                         prt_printf(out, "Invalid option ");
352                         ret = bch2_opt_validate(opt, v, out);
353                         if (ret)
354                                 return ret;
355
356                         printbuf_reset(out);
357                 }
358         }
359
360         /* validate layout */
361         ret = validate_sb_layout(&sb->layout, out);
362         if (ret)
363                 return ret;
364
365         vstruct_for_each(sb, f) {
366                 if (!f->u64s) {
367                         prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
368                                le32_to_cpu(f->type));
369                         return -BCH_ERR_invalid_sb_field_size;
370                 }
371
372                 if (vstruct_next(f) > vstruct_last(sb)) {
373                         prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
374                                le32_to_cpu(f->type));
375                         return -BCH_ERR_invalid_sb_field_size;
376                 }
377         }
378
379         /* members must be validated first: */
380         mi = bch2_sb_get_members(sb);
381         if (!mi) {
382                 prt_printf(out, "Invalid superblock: member info area missing");
383                 return -BCH_ERR_invalid_sb_members_missing;
384         }
385
386         ret = bch2_sb_field_validate(sb, &mi->field, out);
387         if (ret)
388                 return ret;
389
390         vstruct_for_each(sb, f) {
391                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members)
392                         continue;
393
394                 ret = bch2_sb_field_validate(sb, f, out);
395                 if (ret)
396                         return ret;
397         }
398
399         return 0;
400 }
401
402 /* device open: */
403
404 static void bch2_sb_update(struct bch_fs *c)
405 {
406         struct bch_sb *src = c->disk_sb.sb;
407         struct bch_sb_field_members *mi = bch2_sb_get_members(src);
408         struct bch_dev *ca;
409         unsigned i;
410
411         lockdep_assert_held(&c->sb_lock);
412
413         c->sb.uuid              = src->uuid;
414         c->sb.user_uuid         = src->user_uuid;
415         c->sb.version           = le16_to_cpu(src->version);
416         c->sb.version_min       = le16_to_cpu(src->version_min);
417         c->sb.nr_devices        = src->nr_devices;
418         c->sb.clean             = BCH_SB_CLEAN(src);
419         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
420
421         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
422         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
423
424         /* XXX this is wrong, we need a 96 or 128 bit integer type */
425         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
426                                           c->sb.nsec_per_time_unit);
427         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
428
429         c->sb.features          = le64_to_cpu(src->features[0]);
430         c->sb.compat            = le64_to_cpu(src->compat[0]);
431
432         for_each_member_device(ca, c, i)
433                 ca->mi = bch2_mi_to_cpu(mi->members + i);
434 }
435
436 static void __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
437 {
438         struct bch_sb_field *src_f, *dst_f;
439         struct bch_sb *dst = dst_handle->sb;
440         unsigned i;
441
442         dst->version            = src->version;
443         dst->version_min        = src->version_min;
444         dst->seq                = src->seq;
445         dst->uuid               = src->uuid;
446         dst->user_uuid          = src->user_uuid;
447         memcpy(dst->label,      src->label, sizeof(dst->label));
448
449         dst->block_size         = src->block_size;
450         dst->nr_devices         = src->nr_devices;
451
452         dst->time_base_lo       = src->time_base_lo;
453         dst->time_base_hi       = src->time_base_hi;
454         dst->time_precision     = src->time_precision;
455
456         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
457         memcpy(dst->features,   src->features,  sizeof(dst->features));
458         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
459
460         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
461                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
462                         continue;
463
464                 src_f = bch2_sb_field_get(src, i);
465                 dst_f = bch2_sb_field_get(dst, i);
466                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
467                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
468
469                 if (src_f)
470                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
471         }
472 }
473
474 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
475 {
476         struct bch_sb_field_journal *journal_buckets =
477                 bch2_sb_get_journal(src);
478         unsigned journal_u64s = journal_buckets
479                 ? le32_to_cpu(journal_buckets->field.u64s)
480                 : 0;
481         int ret;
482
483         lockdep_assert_held(&c->sb_lock);
484
485         ret = bch2_sb_realloc(&c->disk_sb,
486                               le32_to_cpu(src->u64s) - journal_u64s);
487         if (ret)
488                 return ret;
489
490         __copy_super(&c->disk_sb, src);
491
492         ret = bch2_sb_replicas_to_cpu_replicas(c);
493         if (ret)
494                 return ret;
495
496         ret = bch2_sb_disk_groups_to_cpu(c);
497         if (ret)
498                 return ret;
499
500         bch2_sb_update(c);
501         return 0;
502 }
503
504 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
505 {
506         struct bch_sb *src = c->disk_sb.sb, *dst = ca->disk_sb.sb;
507         struct bch_sb_field_journal *journal_buckets =
508                 bch2_sb_get_journal(dst);
509         unsigned journal_u64s = journal_buckets
510                 ? le32_to_cpu(journal_buckets->field.u64s)
511                 : 0;
512         unsigned u64s = le32_to_cpu(src->u64s) + journal_u64s;
513         int ret;
514
515         ret = bch2_sb_realloc(&ca->disk_sb, u64s);
516         if (ret)
517                 return ret;
518
519         __copy_super(&ca->disk_sb, src);
520         return 0;
521 }
522
523 /* read superblock: */
524
525 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
526 {
527         struct bch_csum csum;
528         u32 version, version_min;
529         size_t bytes;
530         int ret;
531 reread:
532         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
533         sb->bio->bi_iter.bi_sector = offset;
534         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
535
536         ret = submit_bio_wait(sb->bio);
537         if (ret) {
538                 prt_printf(err, "IO error: %i", ret);
539                 return ret;
540         }
541
542         if (uuid_le_cmp(sb->sb->magic, BCACHE_MAGIC) &&
543             uuid_le_cmp(sb->sb->magic, BCHFS_MAGIC)) {
544                 prt_printf(err, "Not a bcachefs superblock");
545                 return -BCH_ERR_invalid_sb_magic;
546         }
547
548         version         = le16_to_cpu(sb->sb->version);
549         version_min     = version >= bcachefs_metadata_version_bkey_renumber
550                 ? le16_to_cpu(sb->sb->version_min)
551                 : version;
552
553         if (version    >= bcachefs_metadata_version_max) {
554                 prt_printf(err, "Unsupported superblock version %u (min %u, max %u)",
555                        version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
556                 return -BCH_ERR_invalid_sb_version;
557         }
558
559         if (version_min < bcachefs_metadata_version_min) {
560                 prt_printf(err, "Unsupported superblock version %u (min %u, max %u)",
561                        version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
562                 return -BCH_ERR_invalid_sb_version;
563         }
564
565         bytes = vstruct_bytes(sb->sb);
566
567         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
568                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
569                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
570                 return -BCH_ERR_invalid_sb_too_big;
571         }
572
573         if (bytes > sb->buffer_size) {
574                 if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s)))
575                         return -ENOMEM;
576                 goto reread;
577         }
578
579         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
580                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
581                 return -BCH_ERR_invalid_sb_csum_type;
582         }
583
584         /* XXX: verify MACs */
585         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
586                             null_nonce(), sb->sb);
587
588         if (bch2_crc_cmp(csum, sb->sb->csum)) {
589                 prt_printf(err, "bad checksum");
590                 return -BCH_ERR_invalid_sb_csum;
591         }
592
593         sb->seq = le64_to_cpu(sb->sb->seq);
594
595         return 0;
596 }
597
598 int bch2_read_super(const char *path, struct bch_opts *opts,
599                     struct bch_sb_handle *sb)
600 {
601         u64 offset = opt_get(*opts, sb);
602         struct bch_sb_layout layout;
603         struct printbuf err = PRINTBUF;
604         __le64 *i;
605         int ret;
606
607         pr_verbose_init(*opts, "");
608
609         memset(sb, 0, sizeof(*sb));
610         sb->mode        = FMODE_READ;
611         sb->have_bio    = true;
612
613         if (!opt_get(*opts, noexcl))
614                 sb->mode |= FMODE_EXCL;
615
616         if (!opt_get(*opts, nochanges))
617                 sb->mode |= FMODE_WRITE;
618
619         sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
620         if (IS_ERR(sb->bdev) &&
621             PTR_ERR(sb->bdev) == -EACCES &&
622             opt_get(*opts, read_only)) {
623                 sb->mode &= ~FMODE_WRITE;
624
625                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
626                 if (!IS_ERR(sb->bdev))
627                         opt_set(*opts, nochanges, true);
628         }
629
630         if (IS_ERR(sb->bdev)) {
631                 ret = PTR_ERR(sb->bdev);
632                 goto out;
633         }
634
635         ret = bch2_sb_realloc(sb, 0);
636         if (ret) {
637                 prt_printf(&err, "error allocating memory for superblock");
638                 goto err;
639         }
640
641         if (bch2_fs_init_fault("read_super")) {
642                 prt_printf(&err, "dynamic fault");
643                 ret = -EFAULT;
644                 goto err;
645         }
646
647         ret = read_one_super(sb, offset, &err);
648         if (!ret)
649                 goto got_super;
650
651         if (opt_defined(*opts, sb))
652                 goto err;
653
654         printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
655                path, err.buf);
656         printbuf_reset(&err);
657
658         /*
659          * Error reading primary superblock - read location of backup
660          * superblocks:
661          */
662         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
663         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
664         /*
665          * use sb buffer to read layout, since sb buffer is page aligned but
666          * layout won't be:
667          */
668         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
669
670         ret = submit_bio_wait(sb->bio);
671         if (ret) {
672                 prt_printf(&err, "IO error: %i", ret);
673                 goto err;
674         }
675
676         memcpy(&layout, sb->sb, sizeof(layout));
677         ret = validate_sb_layout(&layout, &err);
678         if (ret)
679                 goto err;
680
681         for (i = layout.sb_offset;
682              i < layout.sb_offset + layout.nr_superblocks; i++) {
683                 offset = le64_to_cpu(*i);
684
685                 if (offset == opt_get(*opts, sb))
686                         continue;
687
688                 ret = read_one_super(sb, offset, &err);
689                 if (!ret)
690                         goto got_super;
691         }
692
693         goto err;
694
695 got_super:
696         if (le16_to_cpu(sb->sb->block_size) << 9 <
697             bdev_logical_block_size(sb->bdev)) {
698                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
699                        le16_to_cpu(sb->sb->block_size) << 9,
700                        bdev_logical_block_size(sb->bdev));
701                 ret = -BCH_ERR_block_size_too_small;
702                 goto err;
703         }
704
705         ret = 0;
706         sb->have_layout = true;
707
708         ret = bch2_sb_validate(sb, &err, READ);
709         if (ret) {
710                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
711                        path, err.buf);
712                 goto err_no_print;
713         }
714 out:
715         pr_verbose_init(*opts, "ret %i", ret);
716         printbuf_exit(&err);
717         return ret;
718 err:
719         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
720                path, err.buf);
721 err_no_print:
722         bch2_free_super(sb);
723         goto out;
724 }
725
726 /* write superblock: */
727
728 static void write_super_endio(struct bio *bio)
729 {
730         struct bch_dev *ca = bio->bi_private;
731
732         /* XXX: return errors directly */
733
734         if (bch2_dev_io_err_on(bio->bi_status, ca, "superblock write error: %s",
735                                bch2_blk_status_to_str(bio->bi_status)))
736                 ca->sb_write_error = 1;
737
738         closure_put(&ca->fs->sb_write);
739         percpu_ref_put(&ca->io_ref);
740 }
741
742 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
743 {
744         struct bch_sb *sb = ca->disk_sb.sb;
745         struct bio *bio = ca->disk_sb.bio;
746
747         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
748         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
749         bio->bi_end_io          = write_super_endio;
750         bio->bi_private         = ca;
751         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
752
753         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
754                      bio_sectors(bio));
755
756         percpu_ref_get(&ca->io_ref);
757         closure_bio_submit(bio, &c->sb_write);
758 }
759
760 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
761 {
762         struct bch_sb *sb = ca->disk_sb.sb;
763         struct bio *bio = ca->disk_sb.bio;
764
765         sb->offset = sb->layout.sb_offset[idx];
766
767         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
768         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
769                                 null_nonce(), sb);
770
771         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
772         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
773         bio->bi_end_io          = write_super_endio;
774         bio->bi_private         = ca;
775         bch2_bio_map(bio, sb,
776                      roundup((size_t) vstruct_bytes(sb),
777                              bdev_logical_block_size(ca->disk_sb.bdev)));
778
779         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
780                      bio_sectors(bio));
781
782         percpu_ref_get(&ca->io_ref);
783         closure_bio_submit(bio, &c->sb_write);
784 }
785
786 int bch2_write_super(struct bch_fs *c)
787 {
788         struct closure *cl = &c->sb_write;
789         struct bch_dev *ca;
790         struct printbuf err = PRINTBUF;
791         unsigned i, sb = 0, nr_wrote;
792         struct bch_devs_mask sb_written;
793         bool wrote, can_mount_without_written, can_mount_with_written;
794         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
795         int ret = 0;
796
797         trace_and_count(c, write_super, c, _RET_IP_);
798
799         if (c->opts.very_degraded)
800                 degraded_flags |= BCH_FORCE_IF_LOST;
801
802         lockdep_assert_held(&c->sb_lock);
803
804         closure_init_stack(cl);
805         memset(&sb_written, 0, sizeof(sb_written));
806
807         if (c->opts.version_upgrade) {
808                 c->disk_sb.sb->magic = BCHFS_MAGIC;
809                 c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
810         }
811
812         le64_add_cpu(&c->disk_sb.sb->seq, 1);
813
814         if (test_bit(BCH_FS_ERROR, &c->flags))
815                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
816         if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
817                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
818
819         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
820
821         bch2_sb_counters_from_cpu(c);
822
823         for_each_online_member(ca, c, i)
824                 bch2_sb_from_fs(c, ca);
825
826         for_each_online_member(ca, c, i) {
827                 printbuf_reset(&err);
828
829                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
830                 if (ret) {
831                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
832                         percpu_ref_put(&ca->io_ref);
833                         goto out;
834                 }
835         }
836
837         if (c->opts.nochanges)
838                 goto out;
839
840         /*
841          * Defer writing the superblock until filesystem initialization is
842          * complete - don't write out a partly initialized superblock:
843          */
844         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
845                 goto out;
846
847         for_each_online_member(ca, c, i) {
848                 __set_bit(ca->dev_idx, sb_written.d);
849                 ca->sb_write_error = 0;
850         }
851
852         for_each_online_member(ca, c, i)
853                 read_back_super(c, ca);
854         closure_sync(cl);
855
856         for_each_online_member(ca, c, i) {
857                 if (ca->sb_write_error)
858                         continue;
859
860                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
861                         bch2_fs_fatal_error(c,
862                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
863                                 le64_to_cpu(ca->sb_read_scratch->seq),
864                                 ca->disk_sb.seq);
865                         percpu_ref_put(&ca->io_ref);
866                         ret = -EROFS;
867                         goto out;
868                 }
869
870                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
871                         bch2_fs_fatal_error(c,
872                                 "Superblock modified by another process (seq %llu expected %llu)",
873                                 le64_to_cpu(ca->sb_read_scratch->seq),
874                                 ca->disk_sb.seq);
875                         percpu_ref_put(&ca->io_ref);
876                         ret = -EROFS;
877                         goto out;
878                 }
879         }
880
881         do {
882                 wrote = false;
883                 for_each_online_member(ca, c, i)
884                         if (!ca->sb_write_error &&
885                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
886                                 write_one_super(c, ca, sb);
887                                 wrote = true;
888                         }
889                 closure_sync(cl);
890                 sb++;
891         } while (wrote);
892
893         for_each_online_member(ca, c, i) {
894                 if (ca->sb_write_error)
895                         __clear_bit(ca->dev_idx, sb_written.d);
896                 else
897                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
898         }
899
900         nr_wrote = dev_mask_nr(&sb_written);
901
902         can_mount_with_written =
903                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
904
905         for (i = 0; i < ARRAY_SIZE(sb_written.d); i++)
906                 sb_written.d[i] = ~sb_written.d[i];
907
908         can_mount_without_written =
909                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
910
911         /*
912          * If we would be able to mount _without_ the devices we successfully
913          * wrote superblocks to, we weren't able to write to enough devices:
914          *
915          * Exception: if we can mount without the successes because we haven't
916          * written anything (new filesystem), we continue if we'd be able to
917          * mount with the devices we did successfully write to:
918          */
919         if (bch2_fs_fatal_err_on(!nr_wrote ||
920                                  !can_mount_with_written ||
921                                  (can_mount_without_written &&
922                                   !can_mount_with_written), c,
923                 "Unable to write superblock to sufficient devices (from %ps)",
924                 (void *) _RET_IP_))
925                 ret = -1;
926 out:
927         /* Make new options visible after they're persistent: */
928         bch2_sb_update(c);
929         printbuf_exit(&err);
930         return ret;
931 }
932
933 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
934 {
935         mutex_lock(&c->sb_lock);
936         if (!(c->sb.features & (1ULL << feat))) {
937                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
938
939                 bch2_write_super(c);
940         }
941         mutex_unlock(&c->sb_lock);
942 }
943
944 /* BCH_SB_FIELD_members: */
945
946 static int bch2_sb_members_validate(struct bch_sb *sb,
947                                     struct bch_sb_field *f,
948                                     struct printbuf *err)
949 {
950         struct bch_sb_field_members *mi = field_to_type(f, members);
951         unsigned i;
952
953         if ((void *) (mi->members + sb->nr_devices) >
954             vstruct_end(&mi->field)) {
955                 prt_printf(err, "too many devices for section size");
956                 return -BCH_ERR_invalid_sb_members;
957         }
958
959         for (i = 0; i < sb->nr_devices; i++) {
960                 struct bch_member *m = mi->members + i;
961
962                 if (!bch2_member_exists(m))
963                         continue;
964
965                 if (le64_to_cpu(m->nbuckets) > LONG_MAX) {
966                         prt_printf(err, "device %u: too many buckets (got %llu, max %lu)",
967                                i, le64_to_cpu(m->nbuckets), LONG_MAX);
968                         return -BCH_ERR_invalid_sb_members;
969                 }
970
971                 if (le64_to_cpu(m->nbuckets) -
972                     le16_to_cpu(m->first_bucket) < BCH_MIN_NR_NBUCKETS) {
973                         prt_printf(err, "device %u: not enough buckets (got %llu, max %u)",
974                                i, le64_to_cpu(m->nbuckets), BCH_MIN_NR_NBUCKETS);
975                         return -BCH_ERR_invalid_sb_members;
976                 }
977
978                 if (le16_to_cpu(m->bucket_size) <
979                     le16_to_cpu(sb->block_size)) {
980                         prt_printf(err, "device %u: bucket size %u smaller than block size %u",
981                                i, le16_to_cpu(m->bucket_size), le16_to_cpu(sb->block_size));
982                         return -BCH_ERR_invalid_sb_members;
983                 }
984
985                 if (le16_to_cpu(m->bucket_size) <
986                     BCH_SB_BTREE_NODE_SIZE(sb)) {
987                         prt_printf(err, "device %u: bucket size %u smaller than btree node size %llu",
988                                i, le16_to_cpu(m->bucket_size), BCH_SB_BTREE_NODE_SIZE(sb));
989                         return -BCH_ERR_invalid_sb_members;
990                 }
991         }
992
993         return 0;
994 }
995
996 static void bch2_sb_members_to_text(struct printbuf *out, struct bch_sb *sb,
997                                     struct bch_sb_field *f)
998 {
999         struct bch_sb_field_members *mi = field_to_type(f, members);
1000         struct bch_sb_field_disk_groups *gi = bch2_sb_get_disk_groups(sb);
1001         unsigned i;
1002
1003         for (i = 0; i < sb->nr_devices; i++) {
1004                 struct bch_member *m = mi->members + i;
1005                 unsigned data_have = bch2_sb_dev_has_data(sb, i);
1006                 u64 bucket_size = le16_to_cpu(m->bucket_size);
1007                 u64 device_size = le64_to_cpu(m->nbuckets) * bucket_size;
1008
1009                 if (!bch2_member_exists(m))
1010                         continue;
1011
1012                 prt_printf(out, "Device:");
1013                 prt_tab(out);
1014                 prt_printf(out, "%u", i);
1015                 prt_newline(out);
1016
1017                 printbuf_indent_add(out, 2);
1018
1019                 prt_printf(out, "UUID:");
1020                 prt_tab(out);
1021                 pr_uuid(out, m->uuid.b);
1022                 prt_newline(out);
1023
1024                 prt_printf(out, "Size:");
1025                 prt_tab(out);
1026                 prt_units_u64(out, device_size << 9);
1027                 prt_newline(out);
1028
1029                 prt_printf(out, "Bucket size:");
1030                 prt_tab(out);
1031                 prt_units_u64(out, bucket_size << 9);
1032                 prt_newline(out);
1033
1034                 prt_printf(out, "First bucket:");
1035                 prt_tab(out);
1036                 prt_printf(out, "%u", le16_to_cpu(m->first_bucket));
1037                 prt_newline(out);
1038
1039                 prt_printf(out, "Buckets:");
1040                 prt_tab(out);
1041                 prt_printf(out, "%llu", le64_to_cpu(m->nbuckets));
1042                 prt_newline(out);
1043
1044                 prt_printf(out, "Last mount:");
1045                 prt_tab(out);
1046                 if (m->last_mount)
1047                         pr_time(out, le64_to_cpu(m->last_mount));
1048                 else
1049                         prt_printf(out, "(never)");
1050                 prt_newline(out);
1051
1052                 prt_printf(out, "State:");
1053                 prt_tab(out);
1054                 prt_printf(out, "%s",
1055                        BCH_MEMBER_STATE(m) < BCH_MEMBER_STATE_NR
1056                        ? bch2_member_states[BCH_MEMBER_STATE(m)]
1057                        : "unknown");
1058                 prt_newline(out);
1059
1060                 prt_printf(out, "Label:");
1061                 prt_tab(out);
1062                 if (BCH_MEMBER_GROUP(m)) {
1063                         unsigned idx = BCH_MEMBER_GROUP(m) - 1;
1064
1065                         if (idx < disk_groups_nr(gi))
1066                                 prt_printf(out, "%s (%u)",
1067                                        gi->entries[idx].label, idx);
1068                         else
1069                                 prt_printf(out, "(bad disk labels section)");
1070                 } else {
1071                         prt_printf(out, "(none)");
1072                 }
1073                 prt_newline(out);
1074
1075                 prt_printf(out, "Data allowed:");
1076                 prt_tab(out);
1077                 if (BCH_MEMBER_DATA_ALLOWED(m))
1078                         prt_bitflags(out, bch2_data_types, BCH_MEMBER_DATA_ALLOWED(m));
1079                 else
1080                         prt_printf(out, "(none)");
1081                 prt_newline(out);
1082
1083                 prt_printf(out, "Has data:");
1084                 prt_tab(out);
1085                 if (data_have)
1086                         prt_bitflags(out, bch2_data_types, data_have);
1087                 else
1088                         prt_printf(out, "(none)");
1089                 prt_newline(out);
1090
1091                 prt_printf(out, "Discard:");
1092                 prt_tab(out);
1093                 prt_printf(out, "%llu", BCH_MEMBER_DISCARD(m));
1094                 prt_newline(out);
1095
1096                 prt_printf(out, "Freespace initialized:");
1097                 prt_tab(out);
1098                 prt_printf(out, "%llu", BCH_MEMBER_FREESPACE_INITIALIZED(m));
1099                 prt_newline(out);
1100
1101                 printbuf_indent_sub(out, 2);
1102         }
1103 }
1104
1105 static const struct bch_sb_field_ops bch_sb_field_ops_members = {
1106         .validate       = bch2_sb_members_validate,
1107         .to_text        = bch2_sb_members_to_text,
1108 };
1109
1110 /* BCH_SB_FIELD_crypt: */
1111
1112 static int bch2_sb_crypt_validate(struct bch_sb *sb,
1113                                   struct bch_sb_field *f,
1114                                   struct printbuf *err)
1115 {
1116         struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
1117
1118         if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
1119                 prt_printf(err, "wrong size (got %zu should be %zu)",
1120                        vstruct_bytes(&crypt->field), sizeof(*crypt));
1121                 return -BCH_ERR_invalid_sb_crypt;
1122         }
1123
1124         if (BCH_CRYPT_KDF_TYPE(crypt)) {
1125                 prt_printf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
1126                 return -BCH_ERR_invalid_sb_crypt;
1127         }
1128
1129         return 0;
1130 }
1131
1132 static void bch2_sb_crypt_to_text(struct printbuf *out, struct bch_sb *sb,
1133                                   struct bch_sb_field *f)
1134 {
1135         struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
1136
1137         prt_printf(out, "KFD:               %llu", BCH_CRYPT_KDF_TYPE(crypt));
1138         prt_newline(out);
1139         prt_printf(out, "scrypt n:          %llu", BCH_KDF_SCRYPT_N(crypt));
1140         prt_newline(out);
1141         prt_printf(out, "scrypt r:          %llu", BCH_KDF_SCRYPT_R(crypt));
1142         prt_newline(out);
1143         prt_printf(out, "scrypt p:          %llu", BCH_KDF_SCRYPT_P(crypt));
1144         prt_newline(out);
1145 }
1146
1147 static const struct bch_sb_field_ops bch_sb_field_ops_crypt = {
1148         .validate       = bch2_sb_crypt_validate,
1149         .to_text        = bch2_sb_crypt_to_text,
1150 };
1151
1152 /* BCH_SB_FIELD_clean: */
1153
1154 int bch2_sb_clean_validate_late(struct bch_fs *c, struct bch_sb_field_clean *clean, int write)
1155 {
1156         struct jset_entry *entry;
1157         int ret;
1158
1159         for (entry = clean->start;
1160              entry < (struct jset_entry *) vstruct_end(&clean->field);
1161              entry = vstruct_next(entry)) {
1162                 ret = bch2_journal_entry_validate(c, NULL, entry,
1163                                                   le16_to_cpu(c->disk_sb.sb->version),
1164                                                   BCH_SB_BIG_ENDIAN(c->disk_sb.sb),
1165                                                   write);
1166                 if (ret)
1167                         return ret;
1168         }
1169
1170         return 0;
1171 }
1172
1173 int bch2_fs_mark_dirty(struct bch_fs *c)
1174 {
1175         int ret;
1176
1177         /*
1178          * Unconditionally write superblock, to verify it hasn't changed before
1179          * we go rw:
1180          */
1181
1182         mutex_lock(&c->sb_lock);
1183         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
1184         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALWAYS);
1185         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1186         ret = bch2_write_super(c);
1187         mutex_unlock(&c->sb_lock);
1188
1189         return ret;
1190 }
1191
1192 static struct jset_entry *jset_entry_init(struct jset_entry **end, size_t size)
1193 {
1194         struct jset_entry *entry = *end;
1195         unsigned u64s = DIV_ROUND_UP(size, sizeof(u64));
1196
1197         memset(entry, 0, u64s * sizeof(u64));
1198         /*
1199          * The u64s field counts from the start of data, ignoring the shared
1200          * fields.
1201          */
1202         entry->u64s = cpu_to_le16(u64s - 1);
1203
1204         *end = vstruct_next(*end);
1205         return entry;
1206 }
1207
1208 void bch2_journal_super_entries_add_common(struct bch_fs *c,
1209                                            struct jset_entry **end,
1210                                            u64 journal_seq)
1211 {
1212         struct bch_dev *ca;
1213         unsigned i, dev;
1214
1215         percpu_down_read(&c->mark_lock);
1216
1217         if (!journal_seq) {
1218                 for (i = 0; i < ARRAY_SIZE(c->usage); i++)
1219                         bch2_fs_usage_acc_to_base(c, i);
1220         } else {
1221                 bch2_fs_usage_acc_to_base(c, journal_seq & JOURNAL_BUF_MASK);
1222         }
1223
1224         {
1225                 struct jset_entry_usage *u =
1226                         container_of(jset_entry_init(end, sizeof(*u)),
1227                                      struct jset_entry_usage, entry);
1228
1229                 u->entry.type   = BCH_JSET_ENTRY_usage;
1230                 u->entry.btree_id = BCH_FS_USAGE_inodes;
1231                 u->v            = cpu_to_le64(c->usage_base->nr_inodes);
1232         }
1233
1234         {
1235                 struct jset_entry_usage *u =
1236                         container_of(jset_entry_init(end, sizeof(*u)),
1237                                      struct jset_entry_usage, entry);
1238
1239                 u->entry.type   = BCH_JSET_ENTRY_usage;
1240                 u->entry.btree_id = BCH_FS_USAGE_key_version;
1241                 u->v            = cpu_to_le64(atomic64_read(&c->key_version));
1242         }
1243
1244         for (i = 0; i < BCH_REPLICAS_MAX; i++) {
1245                 struct jset_entry_usage *u =
1246                         container_of(jset_entry_init(end, sizeof(*u)),
1247                                      struct jset_entry_usage, entry);
1248
1249                 u->entry.type   = BCH_JSET_ENTRY_usage;
1250                 u->entry.btree_id = BCH_FS_USAGE_reserved;
1251                 u->entry.level  = i;
1252                 u->v            = cpu_to_le64(c->usage_base->persistent_reserved[i]);
1253         }
1254
1255         for (i = 0; i < c->replicas.nr; i++) {
1256                 struct bch_replicas_entry *e =
1257                         cpu_replicas_entry(&c->replicas, i);
1258                 struct jset_entry_data_usage *u =
1259                         container_of(jset_entry_init(end, sizeof(*u) + e->nr_devs),
1260                                      struct jset_entry_data_usage, entry);
1261
1262                 u->entry.type   = BCH_JSET_ENTRY_data_usage;
1263                 u->v            = cpu_to_le64(c->usage_base->replicas[i]);
1264                 memcpy(&u->r, e, replicas_entry_bytes(e));
1265         }
1266
1267         for_each_member_device(ca, c, dev) {
1268                 unsigned b = sizeof(struct jset_entry_dev_usage) +
1269                         sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR;
1270                 struct jset_entry_dev_usage *u =
1271                         container_of(jset_entry_init(end, b),
1272                                      struct jset_entry_dev_usage, entry);
1273
1274                 u->entry.type = BCH_JSET_ENTRY_dev_usage;
1275                 u->dev = cpu_to_le32(dev);
1276                 u->buckets_ec           = cpu_to_le64(ca->usage_base->buckets_ec);
1277
1278                 for (i = 0; i < BCH_DATA_NR; i++) {
1279                         u->d[i].buckets = cpu_to_le64(ca->usage_base->d[i].buckets);
1280                         u->d[i].sectors = cpu_to_le64(ca->usage_base->d[i].sectors);
1281                         u->d[i].fragmented = cpu_to_le64(ca->usage_base->d[i].fragmented);
1282                 }
1283         }
1284
1285         percpu_up_read(&c->mark_lock);
1286
1287         for (i = 0; i < 2; i++) {
1288                 struct jset_entry_clock *clock =
1289                         container_of(jset_entry_init(end, sizeof(*clock)),
1290                                      struct jset_entry_clock, entry);
1291
1292                 clock->entry.type = BCH_JSET_ENTRY_clock;
1293                 clock->rw       = i;
1294                 clock->time     = cpu_to_le64(atomic64_read(&c->io_clock[i].now));
1295         }
1296 }
1297
1298 void bch2_fs_mark_clean(struct bch_fs *c)
1299 {
1300         struct bch_sb_field_clean *sb_clean;
1301         struct jset_entry *entry;
1302         unsigned u64s;
1303         int ret;
1304
1305         mutex_lock(&c->sb_lock);
1306         if (BCH_SB_CLEAN(c->disk_sb.sb))
1307                 goto out;
1308
1309         SET_BCH_SB_CLEAN(c->disk_sb.sb, true);
1310
1311         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_info);
1312         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_metadata);
1313         c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_extents_above_btree_updates));
1314         c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_btree_updates_journalled));
1315
1316         u64s = sizeof(*sb_clean) / sizeof(u64) + c->journal.entry_u64s_reserved;
1317
1318         sb_clean = bch2_sb_resize_clean(&c->disk_sb, u64s);
1319         if (!sb_clean) {
1320                 bch_err(c, "error resizing superblock while setting filesystem clean");
1321                 goto out;
1322         }
1323
1324         sb_clean->flags         = 0;
1325         sb_clean->journal_seq   = cpu_to_le64(atomic64_read(&c->journal.seq));
1326
1327         /* Trying to catch outstanding bug: */
1328         BUG_ON(le64_to_cpu(sb_clean->journal_seq) > S64_MAX);
1329
1330         entry = sb_clean->start;
1331         bch2_journal_super_entries_add_common(c, &entry, 0);
1332         entry = bch2_btree_roots_to_journal_entries(c, entry, entry);
1333         BUG_ON((void *) entry > vstruct_end(&sb_clean->field));
1334
1335         memset(entry, 0,
1336                vstruct_end(&sb_clean->field) - (void *) entry);
1337
1338         /*
1339          * this should be in the write path, and we should be validating every
1340          * superblock section:
1341          */
1342         ret = bch2_sb_clean_validate_late(c, sb_clean, WRITE);
1343         if (ret) {
1344                 bch_err(c, "error writing marking filesystem clean: validate error");
1345                 goto out;
1346         }
1347
1348         bch2_write_super(c);
1349 out:
1350         mutex_unlock(&c->sb_lock);
1351 }
1352
1353 static int bch2_sb_clean_validate(struct bch_sb *sb,
1354                                   struct bch_sb_field *f,
1355                                   struct printbuf *err)
1356 {
1357         struct bch_sb_field_clean *clean = field_to_type(f, clean);
1358
1359         if (vstruct_bytes(&clean->field) < sizeof(*clean)) {
1360                 prt_printf(err, "wrong size (got %zu should be %zu)",
1361                        vstruct_bytes(&clean->field), sizeof(*clean));
1362                 return -BCH_ERR_invalid_sb_clean;
1363         }
1364
1365         return 0;
1366 }
1367
1368 static void bch2_sb_clean_to_text(struct printbuf *out, struct bch_sb *sb,
1369                                   struct bch_sb_field *f)
1370 {
1371         struct bch_sb_field_clean *clean = field_to_type(f, clean);
1372         struct jset_entry *entry;
1373
1374         prt_printf(out, "flags:          %x",   le32_to_cpu(clean->flags));
1375         prt_newline(out);
1376         prt_printf(out, "journal_seq:    %llu", le64_to_cpu(clean->journal_seq));
1377         prt_newline(out);
1378
1379         for (entry = clean->start;
1380              entry != vstruct_end(&clean->field);
1381              entry = vstruct_next(entry)) {
1382                 if (entry->type == BCH_JSET_ENTRY_btree_keys &&
1383                     !entry->u64s)
1384                         continue;
1385
1386                 bch2_journal_entry_to_text(out, NULL, entry);
1387                 prt_newline(out);
1388         }
1389 }
1390
1391 static const struct bch_sb_field_ops bch_sb_field_ops_clean = {
1392         .validate       = bch2_sb_clean_validate,
1393         .to_text        = bch2_sb_clean_to_text,
1394 };
1395
1396 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1397 #define x(f, nr)                                        \
1398         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1399         BCH_SB_FIELDS()
1400 #undef x
1401 };
1402
1403 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1404                                   struct printbuf *err)
1405 {
1406         unsigned type = le32_to_cpu(f->type);
1407         struct printbuf field_err = PRINTBUF;
1408         int ret;
1409
1410         if (type >= BCH_SB_FIELD_NR)
1411                 return 0;
1412
1413         ret = bch2_sb_field_ops[type]->validate(sb, f, &field_err);
1414         if (ret) {
1415                 prt_printf(err, "Invalid superblock section %s: %s",
1416                        bch2_sb_fields[type],
1417                        field_err.buf);
1418                 prt_newline(err);
1419                 bch2_sb_field_to_text(err, sb, f);
1420         }
1421
1422         printbuf_exit(&field_err);
1423         return ret;
1424 }
1425
1426 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1427                            struct bch_sb_field *f)
1428 {
1429         unsigned type = le32_to_cpu(f->type);
1430         const struct bch_sb_field_ops *ops = type < BCH_SB_FIELD_NR
1431                 ? bch2_sb_field_ops[type] : NULL;
1432
1433         if (!out->nr_tabstops)
1434                 printbuf_tabstop_push(out, 32);
1435
1436         if (ops)
1437                 prt_printf(out, "%s", bch2_sb_fields[type]);
1438         else
1439                 prt_printf(out, "(unknown field %u)", type);
1440
1441         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1442         prt_newline(out);
1443
1444         if (ops && ops->to_text) {
1445                 printbuf_indent_add(out, 2);
1446                 bch2_sb_field_ops[type]->to_text(out, sb, f);
1447                 printbuf_indent_sub(out, 2);
1448         }
1449 }
1450
1451 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1452 {
1453         unsigned i;
1454
1455         prt_printf(out, "Type:                    %u", l->layout_type);
1456         prt_newline(out);
1457
1458         prt_str(out, "Superblock max size:     ");
1459         prt_units_u64(out, 512 << l->sb_max_size_bits);
1460         prt_newline(out);
1461
1462         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1463         prt_newline(out);
1464
1465         prt_str(out, "Offsets:                 ");
1466         for (i = 0; i < l->nr_superblocks; i++) {
1467                 if (i)
1468                         prt_str(out, ", ");
1469                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1470         }
1471         prt_newline(out);
1472 }
1473
1474 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1475                      bool print_layout, unsigned fields)
1476 {
1477         struct bch_sb_field_members *mi;
1478         struct bch_sb_field *f;
1479         u64 fields_have = 0;
1480         unsigned nr_devices = 0;
1481
1482         if (!out->nr_tabstops)
1483                 printbuf_tabstop_push(out, 44);
1484
1485         mi = bch2_sb_get_members(sb);
1486         if (mi) {
1487                 struct bch_member *m;
1488
1489                 for (m = mi->members;
1490                      m < mi->members + sb->nr_devices;
1491                      m++)
1492                         nr_devices += bch2_member_exists(m);
1493         }
1494
1495         prt_printf(out, "External UUID:");
1496         prt_tab(out);
1497         pr_uuid(out, sb->user_uuid.b);
1498         prt_newline(out);
1499
1500         prt_printf(out, "Internal UUID:");
1501         prt_tab(out);
1502         pr_uuid(out, sb->uuid.b);
1503         prt_newline(out);
1504
1505         prt_str(out, "Device index:");
1506         prt_tab(out);
1507         prt_printf(out, "%u", sb->dev_idx);
1508         prt_newline(out);
1509
1510         prt_str(out, "Label:");
1511         prt_tab(out);
1512         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1513         prt_newline(out);
1514
1515         prt_str(out, "Version:");
1516         prt_tab(out);
1517         prt_printf(out, "%s", bch2_metadata_versions[le16_to_cpu(sb->version)]);
1518         prt_newline(out);
1519
1520         prt_printf(out, "Oldest version on disk:");
1521         prt_tab(out);
1522         prt_printf(out, "%s", bch2_metadata_versions[le16_to_cpu(sb->version_min)]);
1523         prt_newline(out);
1524
1525         prt_printf(out, "Created:");
1526         prt_tab(out);
1527         if (sb->time_base_lo)
1528                 pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1529         else
1530                 prt_printf(out, "(not set)");
1531         prt_newline(out);
1532
1533         prt_printf(out, "Sequence number:");
1534         prt_tab(out);
1535         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1536         prt_newline(out);
1537
1538         prt_printf(out, "Superblock size:");
1539         prt_tab(out);
1540         prt_printf(out, "%zu", vstruct_bytes(sb));
1541         prt_newline(out);
1542
1543         prt_printf(out, "Clean:");
1544         prt_tab(out);
1545         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1546         prt_newline(out);
1547
1548         prt_printf(out, "Devices:");
1549         prt_tab(out);
1550         prt_printf(out, "%u", nr_devices);
1551         prt_newline(out);
1552
1553         prt_printf(out, "Sections:");
1554         vstruct_for_each(sb, f)
1555                 fields_have |= 1 << le32_to_cpu(f->type);
1556         prt_tab(out);
1557         prt_bitflags(out, bch2_sb_fields, fields_have);
1558         prt_newline(out);
1559
1560         prt_printf(out, "Features:");
1561         prt_tab(out);
1562         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1563         prt_newline(out);
1564
1565         prt_printf(out, "Compat features:");
1566         prt_tab(out);
1567         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1568         prt_newline(out);
1569
1570         prt_newline(out);
1571         prt_printf(out, "Options:");
1572         prt_newline(out);
1573         printbuf_indent_add(out, 2);
1574         {
1575                 enum bch_opt_id id;
1576
1577                 for (id = 0; id < bch2_opts_nr; id++) {
1578                         const struct bch_option *opt = bch2_opt_table + id;
1579
1580                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1581                                 u64 v = bch2_opt_from_sb(sb, id);
1582
1583                                 prt_printf(out, "%s:", opt->attr.name);
1584                                 prt_tab(out);
1585                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1586                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1587                                 prt_newline(out);
1588                         }
1589                 }
1590         }
1591
1592         printbuf_indent_sub(out, 2);
1593
1594         if (print_layout) {
1595                 prt_newline(out);
1596                 prt_printf(out, "layout:");
1597                 prt_newline(out);
1598                 printbuf_indent_add(out, 2);
1599                 bch2_sb_layout_to_text(out, &sb->layout);
1600                 printbuf_indent_sub(out, 2);
1601         }
1602
1603         vstruct_for_each(sb, f)
1604                 if (fields & (1 << le32_to_cpu(f->type))) {
1605                         prt_newline(out);
1606                         bch2_sb_field_to_text(out, sb, f);
1607                 }
1608 }