1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/kernel.h>
4
5 #include "bcachefs.h"
6 #include "compress.h"
7 #include "disk_groups.h"
8 #include "error.h"
9 #include "opts.h"
10 #include "recovery_passes.h"
11 #include "super-io.h"
12 #include "util.h"
13
14 #define x(t, n, ...) [n] = #t,
15
16 const char * const bch2_error_actions[] = {
17 BCH_ERROR_ACTIONS()
18 NULL
19 };
20
21 const char * const bch2_fsck_fix_opts[] = {
22 BCH_FIX_ERRORS_OPTS()
23 NULL
24 };
25
26 const char * const bch2_version_upgrade_opts[] = {
27 BCH_VERSION_UPGRADE_OPTS()
28 NULL
29 };
30
31 const char * const bch2_sb_features[] = {
32 BCH_SB_FEATURES()
33 NULL
34 };
35
36 const char * const bch2_sb_compat[] = {
37 BCH_SB_COMPAT()
38 NULL
39 };
40
41 const char * const __bch2_btree_ids[] = {
42 BCH_BTREE_IDS()
43 NULL
44 };
45
46 static const char * const __bch2_csum_types[] = {
47 BCH_CSUM_TYPES()
48 NULL
49 };
50
51 const char * const bch2_csum_opts[] = {
52 BCH_CSUM_OPTS()
53 NULL
54 };
55
56 static const char * const __bch2_compression_types[] = {
57 BCH_COMPRESSION_TYPES()
58 NULL
59 };
60
61 const char * const bch2_compression_opts[] = {
62 BCH_COMPRESSION_OPTS()
63 NULL
64 };
65
66 const char * const bch2_str_hash_types[] = {
67 BCH_STR_HASH_TYPES()
68 NULL
69 };
70
71 const char * const bch2_str_hash_opts[] = {
72 BCH_STR_HASH_OPTS()
73 NULL
74 };
75
76 const char * const __bch2_data_types[] = {
77 BCH_DATA_TYPES()
78 NULL
79 };
80
81 const char * const bch2_member_states[] = {
82 BCH_MEMBER_STATES()
83 NULL
84 };
85
86 static const char * const __bch2_jset_entry_types[] = {
87 BCH_JSET_ENTRY_TYPES()
88 NULL
89 };
90
91 static const char * const __bch2_fs_usage_types[] = {
92 BCH_FS_USAGE_TYPES()
93 NULL
94 };
95
96 #undef x
97
prt_str_opt_boundscheck(struct printbuf * out,const char * const opts[],unsigned nr,const char * type,unsigned idx)98 static void prt_str_opt_boundscheck(struct printbuf *out, const char * const opts[],
99 unsigned nr, const char *type, unsigned idx)
100 {
101 if (idx < nr)
102 prt_str(out, opts[idx]);
103 else
104 prt_printf(out, "(unknown %s %u)", type, idx);
105 }
106
107 #define PRT_STR_OPT_BOUNDSCHECKED(name, type) \
108 void bch2_prt_##name(struct printbuf *out, type t) \
109 { \
110 prt_str_opt_boundscheck(out, __bch2_##name##s, ARRAY_SIZE(__bch2_##name##s) - 1, #name, t);\
111 }
112
113 PRT_STR_OPT_BOUNDSCHECKED(jset_entry_type, enum bch_jset_entry_type);
114 PRT_STR_OPT_BOUNDSCHECKED(fs_usage_type, enum bch_fs_usage_type);
115 PRT_STR_OPT_BOUNDSCHECKED(data_type, enum bch_data_type);
116 PRT_STR_OPT_BOUNDSCHECKED(csum_type, enum bch_csum_type);
117 PRT_STR_OPT_BOUNDSCHECKED(compression_type, enum bch_compression_type);
118
bch2_opt_fix_errors_parse(struct bch_fs * c,const char * val,u64 * res,struct printbuf * err)119 static int bch2_opt_fix_errors_parse(struct bch_fs *c, const char *val, u64 *res,
120 struct printbuf *err)
121 {
122 if (!val) {
123 *res = FSCK_FIX_yes;
124 } else {
125 int ret = match_string(bch2_fsck_fix_opts, -1, val);
126
127 if (ret < 0 && err)
128 prt_str(err, "fix_errors: invalid selection");
129 if (ret < 0)
130 return ret;
131 *res = ret;
132 }
133
134 return 0;
135 }
136
bch2_opt_fix_errors_to_text(struct printbuf * out,struct bch_fs * c,struct bch_sb * sb,u64 v)137 static void bch2_opt_fix_errors_to_text(struct printbuf *out,
138 struct bch_fs *c,
139 struct bch_sb *sb,
140 u64 v)
141 {
142 prt_str(out, bch2_fsck_fix_opts[v]);
143 }
144
145 #define bch2_opt_fix_errors (struct bch_opt_fn) { \
146 .parse = bch2_opt_fix_errors_parse, \
147 .to_text = bch2_opt_fix_errors_to_text, \
148 }
149
150 const char * const bch2_d_types[BCH_DT_MAX] = {
151 [DT_UNKNOWN] = "unknown",
152 [DT_FIFO] = "fifo",
153 [DT_CHR] = "chr",
154 [DT_DIR] = "dir",
155 [DT_BLK] = "blk",
156 [DT_REG] = "reg",
157 [DT_LNK] = "lnk",
158 [DT_SOCK] = "sock",
159 [DT_WHT] = "whiteout",
160 [DT_SUBVOL] = "subvol",
161 };
162
BCH2_NO_SB_OPT(const struct bch_sb * sb)163 u64 BCH2_NO_SB_OPT(const struct bch_sb *sb)
164 {
165 BUG();
166 }
167
SET_BCH2_NO_SB_OPT(struct bch_sb * sb,u64 v)168 void SET_BCH2_NO_SB_OPT(struct bch_sb *sb, u64 v)
169 {
170 BUG();
171 }
172
bch2_opts_apply(struct bch_opts * dst,struct bch_opts src)173 void bch2_opts_apply(struct bch_opts *dst, struct bch_opts src)
174 {
175 #define x(_name, ...) \
176 if (opt_defined(src, _name)) \
177 opt_set(*dst, _name, src._name);
178
179 BCH_OPTS()
180 #undef x
181 }
182
bch2_opt_defined_by_id(const struct bch_opts * opts,enum bch_opt_id id)183 bool bch2_opt_defined_by_id(const struct bch_opts *opts, enum bch_opt_id id)
184 {
185 switch (id) {
186 #define x(_name, ...) \
187 case Opt_##_name: \
188 return opt_defined(*opts, _name);
189 BCH_OPTS()
190 #undef x
191 default:
192 BUG();
193 }
194 }
195
bch2_opt_get_by_id(const struct bch_opts * opts,enum bch_opt_id id)196 u64 bch2_opt_get_by_id(const struct bch_opts *opts, enum bch_opt_id id)
197 {
198 switch (id) {
199 #define x(_name, ...) \
200 case Opt_##_name: \
201 return opts->_name;
202 BCH_OPTS()
203 #undef x
204 default:
205 BUG();
206 }
207 }
208
bch2_opt_set_by_id(struct bch_opts * opts,enum bch_opt_id id,u64 v)209 void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
210 {
211 switch (id) {
212 #define x(_name, ...) \
213 case Opt_##_name: \
214 opt_set(*opts, _name, v); \
215 break;
216 BCH_OPTS()
217 #undef x
218 default:
219 BUG();
220 }
221 }
222
223 const struct bch_option bch2_opt_table[] = {
224 #define OPT_BOOL() .type = BCH_OPT_BOOL, .min = 0, .max = 2
225 #define OPT_UINT(_min, _max) .type = BCH_OPT_UINT, \
226 .min = _min, .max = _max
227 #define OPT_STR(_choices) .type = BCH_OPT_STR, \
228 .min = 0, .max = ARRAY_SIZE(_choices), \
229 .choices = _choices
230 #define OPT_STR_NOLIMIT(_choices) .type = BCH_OPT_STR, \
231 .min = 0, .max = U64_MAX, \
232 .choices = _choices
233 #define OPT_FN(_fn) .type = BCH_OPT_FN, .fn = _fn
234
235 #define x(_name, _bits, _flags, _type, _sb_opt, _default, _hint, _help) \
236 [Opt_##_name] = { \
237 .attr = { \
238 .name = #_name, \
239 .mode = (_flags) & OPT_RUNTIME ? 0644 : 0444, \
240 }, \
241 .flags = _flags, \
242 .hint = _hint, \
243 .help = _help, \
244 .get_sb = _sb_opt, \
245 .set_sb = SET_##_sb_opt, \
246 _type \
247 },
248
249 BCH_OPTS()
250 #undef x
251 };
252
bch2_opt_lookup(const char * name)253 int bch2_opt_lookup(const char *name)
254 {
255 const struct bch_option *i;
256
257 for (i = bch2_opt_table;
258 i < bch2_opt_table + ARRAY_SIZE(bch2_opt_table);
259 i++)
260 if (!strcmp(name, i->attr.name))
261 return i - bch2_opt_table;
262
263 return -1;
264 }
265
266 struct synonym {
267 const char *s1, *s2;
268 };
269
270 static const struct synonym bch_opt_synonyms[] = {
271 { "quota", "usrquota" },
272 };
273
bch2_mount_opt_lookup(const char * name)274 static int bch2_mount_opt_lookup(const char *name)
275 {
276 const struct synonym *i;
277
278 for (i = bch_opt_synonyms;
279 i < bch_opt_synonyms + ARRAY_SIZE(bch_opt_synonyms);
280 i++)
281 if (!strcmp(name, i->s1))
282 name = i->s2;
283
284 return bch2_opt_lookup(name);
285 }
286
bch2_opt_validate(const struct bch_option * opt,u64 v,struct printbuf * err)287 int bch2_opt_validate(const struct bch_option *opt, u64 v, struct printbuf *err)
288 {
289 if (v < opt->min) {
290 if (err)
291 prt_printf(err, "%s: too small (min %llu)",
292 opt->attr.name, opt->min);
293 return -BCH_ERR_ERANGE_option_too_small;
294 }
295
296 if (opt->max && v >= opt->max) {
297 if (err)
298 prt_printf(err, "%s: too big (max %llu)",
299 opt->attr.name, opt->max);
300 return -BCH_ERR_ERANGE_option_too_big;
301 }
302
303 if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {
304 if (err)
305 prt_printf(err, "%s: not a multiple of 512",
306 opt->attr.name);
307 return -BCH_ERR_opt_parse_error;
308 }
309
310 if ((opt->flags & OPT_MUST_BE_POW_2) && !is_power_of_2(v)) {
311 if (err)
312 prt_printf(err, "%s: must be a power of two",
313 opt->attr.name);
314 return -BCH_ERR_opt_parse_error;
315 }
316
317 if (opt->fn.validate)
318 return opt->fn.validate(v, err);
319
320 return 0;
321 }
322
bch2_opt_parse(struct bch_fs * c,const struct bch_option * opt,const char * val,u64 * res,struct printbuf * err)323 int bch2_opt_parse(struct bch_fs *c,
324 const struct bch_option *opt,
325 const char *val, u64 *res,
326 struct printbuf *err)
327 {
328 ssize_t ret;
329
330 switch (opt->type) {
331 case BCH_OPT_BOOL:
332 if (val) {
333 ret = kstrtou64(val, 10, res);
334 } else {
335 ret = 0;
336 *res = 1;
337 }
338
339 if (ret < 0 || (*res != 0 && *res != 1)) {
340 if (err)
341 prt_printf(err, "%s: must be bool", opt->attr.name);
342 return ret < 0 ? ret : -BCH_ERR_option_not_bool;
343 }
344 break;
345 case BCH_OPT_UINT:
346 if (!val) {
347 prt_printf(err, "%s: required value",
348 opt->attr.name);
349 return -EINVAL;
350 }
351
352 ret = opt->flags & OPT_HUMAN_READABLE
353 ? bch2_strtou64_h(val, res)
354 : kstrtou64(val, 10, res);
355 if (ret < 0) {
356 if (err)
357 prt_printf(err, "%s: must be a number",
358 opt->attr.name);
359 return ret;
360 }
361 break;
362 case BCH_OPT_STR:
363 if (!val) {
364 prt_printf(err, "%s: required value",
365 opt->attr.name);
366 return -EINVAL;
367 }
368
369 ret = match_string(opt->choices, -1, val);
370 if (ret < 0) {
371 if (err)
372 prt_printf(err, "%s: invalid selection",
373 opt->attr.name);
374 return ret;
375 }
376
377 *res = ret;
378 break;
379 case BCH_OPT_FN:
380 ret = opt->fn.parse(c, val, res, err);
381
382 if (ret == -BCH_ERR_option_needs_open_fs)
383 return ret;
384
385 if (ret < 0) {
386 if (err)
387 prt_printf(err, "%s: parse error",
388 opt->attr.name);
389 return ret;
390 }
391 }
392
393 return bch2_opt_validate(opt, *res, err);
394 }
395
bch2_opt_to_text(struct printbuf * out,struct bch_fs * c,struct bch_sb * sb,const struct bch_option * opt,u64 v,unsigned flags)396 void bch2_opt_to_text(struct printbuf *out,
397 struct bch_fs *c, struct bch_sb *sb,
398 const struct bch_option *opt, u64 v,
399 unsigned flags)
400 {
401 if (flags & OPT_SHOW_MOUNT_STYLE) {
402 if (opt->type == BCH_OPT_BOOL) {
403 prt_printf(out, "%s%s",
404 v ? "" : "no",
405 opt->attr.name);
406 return;
407 }
408
409 prt_printf(out, "%s=", opt->attr.name);
410 }
411
412 switch (opt->type) {
413 case BCH_OPT_BOOL:
414 case BCH_OPT_UINT:
415 if (opt->flags & OPT_HUMAN_READABLE)
416 prt_human_readable_u64(out, v);
417 else
418 prt_printf(out, "%lli", v);
419 break;
420 case BCH_OPT_STR:
421 if (flags & OPT_SHOW_FULL_LIST)
422 prt_string_option(out, opt->choices, v);
423 else
424 prt_str(out, opt->choices[v]);
425 break;
426 case BCH_OPT_FN:
427 opt->fn.to_text(out, c, sb, v);
428 break;
429 default:
430 BUG();
431 }
432 }
433
bch2_opt_check_may_set(struct bch_fs * c,int id,u64 v)434 int bch2_opt_check_may_set(struct bch_fs *c, int id, u64 v)
435 {
436 int ret = 0;
437
438 switch (id) {
439 case Opt_compression:
440 case Opt_background_compression:
441 ret = bch2_check_set_has_compressed_data(c, v);
442 break;
443 case Opt_erasure_code:
444 if (v)
445 bch2_check_set_feature(c, BCH_FEATURE_ec);
446 break;
447 }
448
449 return ret;
450 }
451
bch2_opts_check_may_set(struct bch_fs * c)452 int bch2_opts_check_may_set(struct bch_fs *c)
453 {
454 unsigned i;
455 int ret;
456
457 for (i = 0; i < bch2_opts_nr; i++) {
458 ret = bch2_opt_check_may_set(c, i,
459 bch2_opt_get_by_id(&c->opts, i));
460 if (ret)
461 return ret;
462 }
463
464 return 0;
465 }
466
bch2_parse_one_mount_opt(struct bch_fs * c,struct bch_opts * opts,struct printbuf * parse_later,const char * name,const char * val)467 int bch2_parse_one_mount_opt(struct bch_fs *c, struct bch_opts *opts,
468 struct printbuf *parse_later,
469 const char *name, const char *val)
470 {
471 struct printbuf err = PRINTBUF;
472 u64 v;
473 int ret, id;
474
475 id = bch2_mount_opt_lookup(name);
476
477 /* Check for the form "noopt", negation of a boolean opt: */
478 if (id < 0 &&
479 !val &&
480 !strncmp("no", name, 2)) {
481 id = bch2_mount_opt_lookup(name + 2);
482 val = "0";
483 }
484
485 /* Unknown options are ignored: */
486 if (id < 0)
487 return 0;
488
489 if (!(bch2_opt_table[id].flags & OPT_MOUNT))
490 goto bad_opt;
491
492 if (id == Opt_acl &&
493 !IS_ENABLED(CONFIG_BCACHEFS_POSIX_ACL))
494 goto bad_opt;
495
496 if ((id == Opt_usrquota ||
497 id == Opt_grpquota) &&
498 !IS_ENABLED(CONFIG_BCACHEFS_QUOTA))
499 goto bad_opt;
500
501 ret = bch2_opt_parse(c, &bch2_opt_table[id], val, &v, &err);
502 if (ret == -BCH_ERR_option_needs_open_fs && parse_later) {
503 prt_printf(parse_later, "%s=%s,", name, val);
504 if (parse_later->allocation_failure) {
505 ret = -ENOMEM;
506 goto out;
507 }
508
509 ret = 0;
510 goto out;
511 }
512
513 if (ret < 0)
514 goto bad_val;
515
516 if (opts)
517 bch2_opt_set_by_id(opts, id, v);
518
519 ret = 0;
520 goto out;
521
522 bad_opt:
523 pr_err("Bad mount option %s", name);
524 ret = -BCH_ERR_option_name;
525 goto out;
526
527 bad_val:
528 pr_err("Invalid mount option %s", err.buf);
529 ret = -BCH_ERR_option_value;
530
531 out:
532 printbuf_exit(&err);
533 return ret;
534 }
535
bch2_parse_mount_opts(struct bch_fs * c,struct bch_opts * opts,struct printbuf * parse_later,char * options)536 int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
537 struct printbuf *parse_later, char *options)
538 {
539 char *copied_opts, *copied_opts_start;
540 char *opt, *name, *val;
541 int ret;
542
543 if (!options)
544 return 0;
545
546 /*
547 * sys_fsconfig() is now occasionally providing us with option lists
548 * starting with a comma - weird.
549 */
550 if (*options == ',')
551 options++;
552
553 copied_opts = kstrdup(options, GFP_KERNEL);
554 if (!copied_opts)
555 return -ENOMEM;
556 copied_opts_start = copied_opts;
557
558 while ((opt = strsep(&copied_opts, ",")) != NULL) {
559 name = strsep(&opt, "=");
560 val = opt;
561
562 ret = bch2_parse_one_mount_opt(c, opts, parse_later, name, val);
563 if (ret < 0)
564 goto out;
565 }
566
567 ret = 0;
568 goto out;
569
570 out:
571 kfree(copied_opts_start);
572 return ret;
573 }
574
bch2_opt_from_sb(struct bch_sb * sb,enum bch_opt_id id)575 u64 bch2_opt_from_sb(struct bch_sb *sb, enum bch_opt_id id)
576 {
577 const struct bch_option *opt = bch2_opt_table + id;
578 u64 v;
579
580 v = opt->get_sb(sb);
581
582 if (opt->flags & OPT_SB_FIELD_ILOG2)
583 v = 1ULL << v;
584
585 if (opt->flags & OPT_SB_FIELD_SECTORS)
586 v <<= 9;
587
588 return v;
589 }
590
591 /*
592 * Initial options from superblock - here we don't want any options undefined,
593 * any options the superblock doesn't specify are set to 0:
594 */
bch2_opts_from_sb(struct bch_opts * opts,struct bch_sb * sb)595 int bch2_opts_from_sb(struct bch_opts *opts, struct bch_sb *sb)
596 {
597 unsigned id;
598
599 for (id = 0; id < bch2_opts_nr; id++) {
600 const struct bch_option *opt = bch2_opt_table + id;
601
602 if (opt->get_sb == BCH2_NO_SB_OPT)
603 continue;
604
605 bch2_opt_set_by_id(opts, id, bch2_opt_from_sb(sb, id));
606 }
607
608 return 0;
609 }
610
__bch2_opt_set_sb(struct bch_sb * sb,const struct bch_option * opt,u64 v)611 void __bch2_opt_set_sb(struct bch_sb *sb, const struct bch_option *opt, u64 v)
612 {
613 if (opt->set_sb == SET_BCH2_NO_SB_OPT)
614 return;
615
616 if (opt->flags & OPT_SB_FIELD_SECTORS)
617 v >>= 9;
618
619 if (opt->flags & OPT_SB_FIELD_ILOG2)
620 v = ilog2(v);
621
622 opt->set_sb(sb, v);
623 }
624
bch2_opt_set_sb(struct bch_fs * c,const struct bch_option * opt,u64 v)625 void bch2_opt_set_sb(struct bch_fs *c, const struct bch_option *opt, u64 v)
626 {
627 if (opt->set_sb == SET_BCH2_NO_SB_OPT)
628 return;
629
630 mutex_lock(&c->sb_lock);
631 __bch2_opt_set_sb(c->disk_sb.sb, opt, v);
632 bch2_write_super(c);
633 mutex_unlock(&c->sb_lock);
634 }
635
636 /* io opts: */
637
bch2_opts_to_inode_opts(struct bch_opts src)638 struct bch_io_opts bch2_opts_to_inode_opts(struct bch_opts src)
639 {
640 return (struct bch_io_opts) {
641 #define x(_name, _bits) ._name = src._name,
642 BCH_INODE_OPTS()
643 #undef x
644 };
645 }
646
bch2_opt_is_inode_opt(enum bch_opt_id id)647 bool bch2_opt_is_inode_opt(enum bch_opt_id id)
648 {
649 static const enum bch_opt_id inode_opt_list[] = {
650 #define x(_name, _bits) Opt_##_name,
651 BCH_INODE_OPTS()
652 #undef x
653 };
654 unsigned i;
655
656 for (i = 0; i < ARRAY_SIZE(inode_opt_list); i++)
657 if (inode_opt_list[i] == id)
658 return true;
659
660 return false;
661 }
662