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Fix btrfs-convert, btrfs-restore and btrfs-find-root build
[btrfs-progs-unstable/devel.git] / cmds-scrub.c
blobc4503f444fbcabc7eaece28468373ab2be894aae
1 /*
2 * Copyright (C) 2011 STRATO. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #include <sys/ioctl.h>
20 #include <sys/wait.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <sys/un.h>
25 #include <poll.h>
26 #include <sys/file.h>
27 #include <uuid/uuid.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <pthread.h>
31 #include <ctype.h>
32 #include <signal.h>
33 #include <stdarg.h>
34
35 #include "ctree.h"
36 #include "ioctl.h"
37 #include "utils.h"
38 #include "volumes.h"
39 #include "disk-io.h"
40
41 #include "commands.h"
42
43 static const char * const scrub_cmd_group_usage[] = {
44 "btrfs scrub <command> [options] <path>|<device>",
45 NULL
46 };
47
48 #define SCRUB_DATA_FILE "/var/lib/btrfs/scrub.status"
49 #define SCRUB_PROGRESS_SOCKET_PATH "/var/lib/btrfs/scrub.progress"
50 #define SCRUB_FILE_VERSION_PREFIX "scrub status"
51 #define SCRUB_FILE_VERSION "1"
52
53 struct scrub_stats {
54 time_t t_start;
55 time_t t_resumed;
56 u64 duration;
57 u64 finished;
58 u64 canceled;
59 };
60
61 struct scrub_progress {
62 struct btrfs_ioctl_scrub_args scrub_args;
63 int fd;
64 int ret;
65 int skip;
66 struct scrub_stats stats;
67 struct scrub_file_record *resumed;
68 int ioctl_errno;
69 pthread_mutex_t progress_mutex;
70 };
71
72 struct scrub_file_record {
73 u8 fsid[BTRFS_FSID_SIZE];
74 u64 devid;
75 struct scrub_stats stats;
76 struct btrfs_scrub_progress p;
77 };
78
79 struct scrub_progress_cycle {
80 int fdmnt;
81 int prg_fd;
82 int do_record;
83 struct btrfs_ioctl_fs_info_args *fi;
84 struct scrub_progress *progress;
85 struct scrub_progress *shared_progress;
86 pthread_mutex_t *write_mutex;
87 };
88
89 struct scrub_fs_stat {
90 struct btrfs_scrub_progress p;
91 struct scrub_stats s;
92 int i;
93 };
94
95 static void print_scrub_full(struct btrfs_scrub_progress *sp)
96 {
97 printf("\tdata_extents_scrubbed: %lld\n", sp->data_extents_scrubbed);
98 printf("\ttree_extents_scrubbed: %lld\n", sp->tree_extents_scrubbed);
99 printf("\tdata_bytes_scrubbed: %lld\n", sp->data_bytes_scrubbed);
100 printf("\ttree_bytes_scrubbed: %lld\n", sp->tree_bytes_scrubbed);
101 printf("\tread_errors: %lld\n", sp->read_errors);
102 printf("\tcsum_errors: %lld\n", sp->csum_errors);
103 printf("\tverify_errors: %lld\n", sp->verify_errors);
104 printf("\tno_csum: %lld\n", sp->no_csum);
105 printf("\tcsum_discards: %lld\n", sp->csum_discards);
106 printf("\tsuper_errors: %lld\n", sp->super_errors);
107 printf("\tmalloc_errors: %lld\n", sp->malloc_errors);
108 printf("\tuncorrectable_errors: %lld\n", sp->uncorrectable_errors);
109 printf("\tunverified_errors: %lld\n", sp->unverified_errors);
110 printf("\tcorrected_errors: %lld\n", sp->corrected_errors);
111 printf("\tlast_physical: %lld\n", sp->last_physical);
112 }
113
114 #define ERR(test, ...) do { \
115 if (test) \
116 fprintf(stderr, __VA_ARGS__); \
117 } while (0)
118
119 #define PRINT_SCRUB_ERROR(test, desc) do { \
120 if (test) \
121 printf(" %s=%llu", desc, test); \
122 } while (0)
123
124 static void print_scrub_summary(struct btrfs_scrub_progress *p)
125 {
126 u64 err_cnt;
127 u64 err_cnt2;
128 char *bytes;
129
130 err_cnt = p->read_errors +
131 p->csum_errors +
132 p->verify_errors +
133 p->super_errors;
134
135 err_cnt2 = p->corrected_errors + p->uncorrectable_errors;
136
137 if (p->malloc_errors)
138 printf("*** WARNING: memory allocation failed while scrubbing. "
139 "results may be inaccurate\n");
140 bytes = pretty_sizes(p->data_bytes_scrubbed + p->tree_bytes_scrubbed);
141 printf("\ttotal bytes scrubbed: %s with %llu errors\n", bytes,
142 max(err_cnt, err_cnt2));
143 free(bytes);
144 if (err_cnt || err_cnt2) {
145 printf("\terror details:");
146 PRINT_SCRUB_ERROR(p->read_errors, "read");
147 PRINT_SCRUB_ERROR(p->super_errors, "super");
148 PRINT_SCRUB_ERROR(p->verify_errors, "verify");
149 PRINT_SCRUB_ERROR(p->csum_errors, "csum");
150 printf("\n");
151 printf("\tcorrected errors: %llu, uncorrectable errors: %llu, "
152 "unverified errors: %llu\n", p->corrected_errors,
153 p->uncorrectable_errors, p->unverified_errors);
154 }
155 }
156
157 #define _SCRUB_FS_STAT(p, name, fs_stat) do { \
158 fs_stat->p.name += p->name; \
159 } while (0)
160
161 #define _SCRUB_FS_STAT_MIN(ss, name, fs_stat) \
162 do { \
163 if (fs_stat->s.name > ss->name) { \
164 fs_stat->s.name = ss->name; \
165 } \
166 } while (0)
167
168 #define _SCRUB_FS_STAT_ZMIN(ss, name, fs_stat) \
169 do { \
170 if (!fs_stat->s.name || fs_stat->s.name > ss->name) { \
171 fs_stat->s.name = ss->name; \
172 } \
173 } while (0)
174
175 #define _SCRUB_FS_STAT_ZMAX(ss, name, fs_stat) \
176 do { \
177 if (!(fs_stat)->s.name || (fs_stat)->s.name < (ss)->name) { \
178 (fs_stat)->s.name = (ss)->name; \
179 } \
180 } while (0)
181
182 static void add_to_fs_stat(struct btrfs_scrub_progress *p,
183 struct scrub_stats *ss,
184 struct scrub_fs_stat *fs_stat)
185 {
186 _SCRUB_FS_STAT(p, data_extents_scrubbed, fs_stat);
187 _SCRUB_FS_STAT(p, tree_extents_scrubbed, fs_stat);
188 _SCRUB_FS_STAT(p, data_bytes_scrubbed, fs_stat);
189 _SCRUB_FS_STAT(p, tree_bytes_scrubbed, fs_stat);
190 _SCRUB_FS_STAT(p, read_errors, fs_stat);
191 _SCRUB_FS_STAT(p, csum_errors, fs_stat);
192 _SCRUB_FS_STAT(p, verify_errors, fs_stat);
193 _SCRUB_FS_STAT(p, no_csum, fs_stat);
194 _SCRUB_FS_STAT(p, csum_discards, fs_stat);
195 _SCRUB_FS_STAT(p, super_errors, fs_stat);
196 _SCRUB_FS_STAT(p, malloc_errors, fs_stat);
197 _SCRUB_FS_STAT(p, uncorrectable_errors, fs_stat);
198 _SCRUB_FS_STAT(p, corrected_errors, fs_stat);
199 _SCRUB_FS_STAT(p, last_physical, fs_stat);
200 _SCRUB_FS_STAT_ZMIN(ss, t_start, fs_stat);
201 _SCRUB_FS_STAT_ZMIN(ss, t_resumed, fs_stat);
202 _SCRUB_FS_STAT_ZMAX(ss, duration, fs_stat);
203 _SCRUB_FS_STAT_ZMAX(ss, canceled, fs_stat);
204 _SCRUB_FS_STAT_MIN(ss, finished, fs_stat);
205 }
206
207 static void init_fs_stat(struct scrub_fs_stat *fs_stat)
208 {
209 memset(fs_stat, 0, sizeof(*fs_stat));
210 fs_stat->s.finished = 1;
211 }
212
213 static void _print_scrub_ss(struct scrub_stats *ss)
214 {
215 char t[4096];
216 struct tm tm;
217
218 if (!ss || !ss->t_start) {
219 printf("\tno stats available\n");
220 return;
221 }
222 if (ss->t_resumed) {
223 localtime_r(&ss->t_resumed, &tm);
224 strftime(t, sizeof(t), "%c", &tm);
225 t[sizeof(t) - 1] = '\0';
226 printf("\tscrub resumed at %s", t);
227 } else {
228 localtime_r(&ss->t_start, &tm);
229 strftime(t, sizeof(t), "%c", &tm);
230 t[sizeof(t) - 1] = '\0';
231 printf("\tscrub started at %s", t);
232 }
233 if (ss->finished && !ss->canceled) {
234 printf(" and finished after %llu seconds\n",
235 ss->duration);
236 } else if (ss->canceled) {
237 printf(" and was aborted after %llu seconds\n",
238 ss->duration);
239 } else {
240 printf(", running for %llu seconds\n", ss->duration);
241 }
242 }
243
244 static void print_scrub_dev(struct btrfs_ioctl_dev_info_args *di,
245 struct btrfs_scrub_progress *p, int raw,
246 const char *append, struct scrub_stats *ss)
247 {
248 printf("scrub device %s (id %llu) %s\n", di->path, di->devid,
249 append ? append : "");
250
251 _print_scrub_ss(ss);
252
253 if (p) {
254 if (raw)
255 print_scrub_full(p);
256 else
257 print_scrub_summary(p);
258 }
259 }
260
261 static void print_fs_stat(struct scrub_fs_stat *fs_stat, int raw)
262 {
263 _print_scrub_ss(&fs_stat->s);
264
265 if (raw)
266 print_scrub_full(&fs_stat->p);
267 else
268 print_scrub_summary(&fs_stat->p);
269 }
270
271 static void free_history(struct scrub_file_record **last_scrubs)
272 {
273 struct scrub_file_record **l = last_scrubs;
274 if (!l)
275 return;
276 while (*l)
277 free(*l++);
278 free(last_scrubs);
279 }
280
281 /*
282 * cancels a running scrub and makes the master process record the current
283 * progress status before exiting.
284 */
285 static int cancel_fd = -1;
286 static void scrub_sigint_record_progress(int signal)
287 {
288 ioctl(cancel_fd, BTRFS_IOC_SCRUB_CANCEL, NULL);
289 }
290
291 static int scrub_handle_sigint_parent(void)
292 {
293 struct sigaction sa = {
294 .sa_handler = SIG_IGN,
295 .sa_flags = SA_RESTART,
296 };
297
298 return sigaction(SIGINT, &sa, NULL);
299 }
300
301 static int scrub_handle_sigint_child(int fd)
302 {
303 struct sigaction sa = {
304 .sa_handler = fd == -1 ? SIG_DFL : scrub_sigint_record_progress,
305 };
306
307 cancel_fd = fd;
308 return sigaction(SIGINT, &sa, NULL);
309 }
310
311 static int scrub_datafile(const char *fn_base, const char *fn_local,
312 const char *fn_tmp, char *datafile, int size)
313 {
314 int ret;
315 int end = size - 2;
316
317 datafile[end + 1] = '\0';
318 strncpy(datafile, fn_base, end);
319 ret = strlen(datafile);
320
321 if (ret + 1 > end)
322 return -EOVERFLOW;
323
324 datafile[ret] = '.';
325 strncpy(datafile + ret + 1, fn_local, end - ret - 1);
326 ret = strlen(datafile);
327
328 if (ret + 1 > end)
329 return -EOVERFLOW;
330
331 if (fn_tmp) {
332 datafile[ret] = '_';
333 strncpy(datafile + ret + 1, fn_tmp, end - ret - 1);
334 ret = strlen(datafile);
335
336 if (ret > end)
337 return -EOVERFLOW;
338 }
339
340 return 0;
341 }
342
343 static int scrub_open_file(const char *datafile, int m)
344 {
345 int fd;
346 int ret;
347
348 fd = open(datafile, m, 0600);
349 if (fd < 0)
350 return -errno;
351
352 ret = flock(fd, LOCK_EX|LOCK_NB);
353 if (ret) {
354 ret = errno;
355 close(fd);
356 return -ret;
357 }
358
359 return fd;
360 }
361
362 static int scrub_open_file_r(const char *fn_base, const char *fn_local)
363 {
364 int ret;
365 char datafile[BTRFS_PATH_NAME_MAX + 1];
366 ret = scrub_datafile(fn_base, fn_local, NULL,
367 datafile, sizeof(datafile));
368 if (ret < 0)
369 return ret;
370 return scrub_open_file(datafile, O_RDONLY);
371 }
372
373 static int scrub_open_file_w(const char *fn_base, const char *fn_local,
374 const char *tmp)
375 {
376 int ret;
377 char datafile[BTRFS_PATH_NAME_MAX + 1];
378 ret = scrub_datafile(fn_base, fn_local, tmp,
379 datafile, sizeof(datafile));
380 if (ret < 0)
381 return ret;
382 return scrub_open_file(datafile, O_WRONLY|O_CREAT);
383 }
384
385 static int scrub_rename_file(const char *fn_base, const char *fn_local,
386 const char *tmp)
387 {
388 int ret;
389 char datafile_old[BTRFS_PATH_NAME_MAX + 1];
390 char datafile_new[BTRFS_PATH_NAME_MAX + 1];
391 ret = scrub_datafile(fn_base, fn_local, tmp,
392 datafile_old, sizeof(datafile_old));
393 if (ret < 0)
394 return ret;
395 ret = scrub_datafile(fn_base, fn_local, NULL,
396 datafile_new, sizeof(datafile_new));
397 if (ret < 0)
398 return ret;
399 ret = rename(datafile_old, datafile_new);
400 return ret ? -errno : 0;
401 }
402
403 #define _SCRUB_KVREAD(ret, i, name, avail, l, dest) if (ret == 0) { \
404 ret = scrub_kvread(i, sizeof(#name), avail, l, #name, dest.name); \
405 }
406
407 /*
408 * returns 0 if the key did not match (nothing was read)
409 * 1 if the key did match (success)
410 * -1 if the key did match and an error occured
411 */
412 static int scrub_kvread(int *i, int len, int avail, const char *buf,
413 const char *key, u64 *dest)
414 {
415 int j;
416
417 if (*i + len + 1 < avail && strncmp(&buf[*i], key, len - 1) == 0) {
418 *i += len - 1;
419 if (buf[*i] != ':')
420 return -1;
421 *i += 1;
422 for (j = 0; isdigit(buf[*i + j]) && *i + j < avail; ++j)
423 ;
424 if (*i + j >= avail)
425 return -1;
426 *dest = atoll(&buf[*i]);
427 *i += j;
428 return 1;
429 }
430
431 return 0;
432 }
433
434 #define _SCRUB_INVALID do { \
435 if (report_errors) \
436 fprintf(stderr, "WARNING: invalid data in line %d pos " \
437 "%d state %d (near \"%.*s\") at %s:%d\n", \
438 lineno, i, state, 20 > avail ? avail : 20, \
439 l + i, __FILE__, __LINE__); \
440 goto skip; \
441 } while (0)
442
443 static struct scrub_file_record **scrub_read_file(int fd, int report_errors)
444 {
445 int avail = 0;
446 int old_avail = 0;
447 char l[16 * 1024];
448 int state = 0;
449 int curr = -1;
450 int i = 0;
451 int j;
452 int ret;
453 int eof = 0;
454 int lineno = 0;
455 u64 version;
456 char empty_uuid[BTRFS_FSID_SIZE] = {0};
457 struct scrub_file_record **p = NULL;
458
459 if (fd < 0)
460 return ERR_PTR(-EINVAL);
461
462 again:
463 old_avail = avail - i;
464 BUG_ON(old_avail < 0);
465 if (old_avail)
466 memmove(l, l + i, old_avail);
467 avail = read(fd, l + old_avail, sizeof(l) - old_avail);
468 if (avail == 0)
469 eof = 1;
470 if (avail == 0 && old_avail == 0) {
471 if (curr >= 0 &&
472 memcmp(p[curr]->fsid, empty_uuid, BTRFS_FSID_SIZE) == 0) {
473 p[curr] = NULL;
474 } else if (curr == -1) {
475 p = ERR_PTR(-ENODATA);
476 }
477 return p;
478 }
479 if (avail == -1)
480 return ERR_PTR(-errno);
481 avail += old_avail;
482
483 i = 0;
484 while (i < avail) {
485 switch (state) {
486 case 0: /* start of file */
487 ret = scrub_kvread(&i,
488 sizeof(SCRUB_FILE_VERSION_PREFIX), avail, l,
489 SCRUB_FILE_VERSION_PREFIX, &version);
490 if (ret != 1)
491 _SCRUB_INVALID;
492 if (version != atoll(SCRUB_FILE_VERSION))
493 return ERR_PTR(-ENOTSUP);
494 state = 6;
495 continue;
496 case 1: /* start of line, alloc */
497 /*
498 * this state makes sure we have a complete line in
499 * further processing, so we don't need wrap-tracking
500 * everywhere.
501 */
502 if (!eof && !memchr(l + i, '\n', avail - i))
503 goto again;
504 ++lineno;
505 if (curr > -1 && memcmp(p[curr]->fsid, empty_uuid,
506 BTRFS_FSID_SIZE) == 0) {
507 state = 2;
508 continue;
509 }
510 ++curr;
511 p = realloc(p, (curr + 2) * sizeof(*p));
512 if (p)
513 p[curr] = malloc(sizeof(**p));
514 if (!p || !p[curr])
515 return ERR_PTR(-errno);
516 memset(p[curr], 0, sizeof(**p));
517 p[curr + 1] = NULL;
518 ++state;
519 /* fall through */
520 case 2: /* start of line, skip space */
521 while (isspace(l[i]) && i < avail) {
522 if (l[i] == '\n')
523 ++lineno;
524 ++i;
525 }
526 if (i >= avail ||
527 (!eof && !memchr(l + i, '\n', avail - i)))
528 goto again;
529 ++state;
530 /* fall through */
531 case 3: /* read fsid */
532 if (i == avail)
533 continue;
534 for (j = 0; l[i + j] != ':' && i + j < avail; ++j)
535 ;
536 if (i + j + 1 >= avail)
537 _SCRUB_INVALID;
538 if (j != 36)
539 _SCRUB_INVALID;
540 l[i + j] = '\0';
541 ret = uuid_parse(l + i, p[curr]->fsid);
542 if (ret)
543 _SCRUB_INVALID;
544 i += j + 1;
545 ++state;
546 /* fall through */
547 case 4: /* read dev id */
548 for (j = 0; isdigit(l[i + j]) && i+j < avail; ++j)
549 ;
550 if (j == 0 || i + j + 1 >= avail)
551 _SCRUB_INVALID;
552 p[curr]->devid = atoll(&l[i]);
553 i += j + 1;
554 ++state;
555 /* fall through */
556 case 5: /* read key/value pair */
557 ret = 0;
558 _SCRUB_KVREAD(ret, &i, data_extents_scrubbed, avail, l,
559 &p[curr]->p);
560 _SCRUB_KVREAD(ret, &i, data_extents_scrubbed, avail, l,
561 &p[curr]->p);
562 _SCRUB_KVREAD(ret, &i, tree_extents_scrubbed, avail, l,
563 &p[curr]->p);
564 _SCRUB_KVREAD(ret, &i, data_bytes_scrubbed, avail, l,
565 &p[curr]->p);
566 _SCRUB_KVREAD(ret, &i, tree_bytes_scrubbed, avail, l,
567 &p[curr]->p);
568 _SCRUB_KVREAD(ret, &i, read_errors, avail, l,
569 &p[curr]->p);
570 _SCRUB_KVREAD(ret, &i, csum_errors, avail, l,
571 &p[curr]->p);
572 _SCRUB_KVREAD(ret, &i, verify_errors, avail, l,
573 &p[curr]->p);
574 _SCRUB_KVREAD(ret, &i, no_csum, avail, l,
575 &p[curr]->p);
576 _SCRUB_KVREAD(ret, &i, csum_discards, avail, l,
577 &p[curr]->p);
578 _SCRUB_KVREAD(ret, &i, super_errors, avail, l,
579 &p[curr]->p);
580 _SCRUB_KVREAD(ret, &i, malloc_errors, avail, l,
581 &p[curr]->p);
582 _SCRUB_KVREAD(ret, &i, uncorrectable_errors, avail, l,
583 &p[curr]->p);
584 _SCRUB_KVREAD(ret, &i, corrected_errors, avail, l,
585 &p[curr]->p);
586 _SCRUB_KVREAD(ret, &i, last_physical, avail, l,
587 &p[curr]->p);
588 _SCRUB_KVREAD(ret, &i, finished, avail, l,
589 &p[curr]->stats);
590 _SCRUB_KVREAD(ret, &i, t_start, avail, l,
591 (u64 *)&p[curr]->stats);
592 _SCRUB_KVREAD(ret, &i, t_resumed, avail, l,
593 (u64 *)&p[curr]->stats);
594 _SCRUB_KVREAD(ret, &i, duration, avail, l,
595 (u64 *)&p[curr]->stats);
596 _SCRUB_KVREAD(ret, &i, canceled, avail, l,
597 &p[curr]->stats);
598 if (ret != 1)
599 _SCRUB_INVALID;
600 ++state;
601 /* fall through */
602 case 6: /* after number */
603 if (l[i] == '|')
604 state = 5;
605 else if (l[i] == '\n')
606 state = 1;
607 else
608 _SCRUB_INVALID;
609 ++i;
610 continue;
611 case 99: /* skip rest of line */
612 skip:
613 state = 99;
614 do {
615 ++i;
616 if (l[i - 1] == '\n') {
617 state = 1;
618 break;
619 }
620 } while (i < avail);
621 continue;
622 }
623 BUG();
624 }
625 goto again;
626 }
627
628 static int scrub_write_buf(int fd, const void *data, int len)
629 {
630 int ret;
631 ret = write(fd, data, len);
632 return ret - len;
633 }
634
635 static int scrub_writev(int fd, char *buf, int max, const char *fmt, ...)
636 __attribute__ ((format (printf, 4, 5)));
637 static int scrub_writev(int fd, char *buf, int max, const char *fmt, ...)
638 {
639 int ret;
640 va_list args;
641
642 va_start(args, fmt);
643 ret = vsnprintf(buf, max, fmt, args);
644 va_end(args);
645 if (ret >= max)
646 return ret - max;
647 return scrub_write_buf(fd, buf, ret);
648 }
649
650 #define _SCRUB_SUM(dest, data, name) dest->scrub_args.progress.name = \
651 data->resumed->p.name + data->scrub_args.progress.name
652
653 static struct scrub_progress *scrub_resumed_stats(struct scrub_progress *data,
654 struct scrub_progress *dest)
655 {
656 if (!data->resumed || data->skip)
657 return data;
658
659 _SCRUB_SUM(dest, data, data_extents_scrubbed);
660 _SCRUB_SUM(dest, data, tree_extents_scrubbed);
661 _SCRUB_SUM(dest, data, data_bytes_scrubbed);
662 _SCRUB_SUM(dest, data, tree_bytes_scrubbed);
663 _SCRUB_SUM(dest, data, read_errors);
664 _SCRUB_SUM(dest, data, csum_errors);
665 _SCRUB_SUM(dest, data, verify_errors);
666 _SCRUB_SUM(dest, data, no_csum);
667 _SCRUB_SUM(dest, data, csum_discards);
668 _SCRUB_SUM(dest, data, super_errors);
669 _SCRUB_SUM(dest, data, malloc_errors);
670 _SCRUB_SUM(dest, data, uncorrectable_errors);
671 _SCRUB_SUM(dest, data, corrected_errors);
672 _SCRUB_SUM(dest, data, last_physical);
673 dest->stats.canceled = data->stats.canceled;
674 dest->stats.finished = data->stats.finished;
675 dest->stats.t_resumed = data->stats.t_start;
676 dest->stats.t_start = data->resumed->stats.t_start;
677 dest->stats.duration = data->resumed->stats.duration +
678 data->stats.duration;
679 dest->scrub_args.devid = data->scrub_args.devid;
680 return dest;
681 }
682
683 #define _SCRUB_KVWRITE(fd, buf, name, use) \
684 scrub_kvwrite(fd, buf, sizeof(buf), #name, \
685 use->scrub_args.progress.name)
686
687 #define _SCRUB_KVWRITE_STATS(fd, buf, name, use) \
688 scrub_kvwrite(fd, buf, sizeof(buf), #name, \
689 use->stats.name)
690
691 static int scrub_kvwrite(int fd, char *buf, int max, const char *key, u64 val)
692 {
693 return scrub_writev(fd, buf, max, "|%s:%lld", key, val);
694 }
695
696 static int scrub_write_file(int fd, const char *fsid,
697 struct scrub_progress *data, int n)
698 {
699 int ret = 0;
700 int i;
701 char buf[1024];
702 struct scrub_progress local;
703 struct scrub_progress *use;
704
705 if (n < 1)
706 return -EINVAL;
707
708 /* each -1 is to subtract one \0 byte, the + 2 is for ':' and '\n' */
709 ret = scrub_write_buf(fd, SCRUB_FILE_VERSION_PREFIX ":"
710 SCRUB_FILE_VERSION "\n",
711 (sizeof(SCRUB_FILE_VERSION_PREFIX) - 1) +
712 (sizeof(SCRUB_FILE_VERSION) - 1) + 2);
713 if (ret)
714 return -EOVERFLOW;
715
716 for (i = 0; i < n; ++i) {
717 use = scrub_resumed_stats(&data[i], &local);
718 if (scrub_write_buf(fd, fsid, strlen(fsid)) ||
719 scrub_write_buf(fd, ":", 1) ||
720 scrub_writev(fd, buf, sizeof(buf), "%lld",
721 use->scrub_args.devid) ||
722 scrub_write_buf(fd, buf, ret) ||
723 _SCRUB_KVWRITE(fd, buf, data_extents_scrubbed, use) ||
724 _SCRUB_KVWRITE(fd, buf, tree_extents_scrubbed, use) ||
725 _SCRUB_KVWRITE(fd, buf, data_bytes_scrubbed, use) ||
726 _SCRUB_KVWRITE(fd, buf, tree_bytes_scrubbed, use) ||
727 _SCRUB_KVWRITE(fd, buf, read_errors, use) ||
728 _SCRUB_KVWRITE(fd, buf, csum_errors, use) ||
729 _SCRUB_KVWRITE(fd, buf, verify_errors, use) ||
730 _SCRUB_KVWRITE(fd, buf, no_csum, use) ||
731 _SCRUB_KVWRITE(fd, buf, csum_discards, use) ||
732 _SCRUB_KVWRITE(fd, buf, super_errors, use) ||
733 _SCRUB_KVWRITE(fd, buf, malloc_errors, use) ||
734 _SCRUB_KVWRITE(fd, buf, uncorrectable_errors, use) ||
735 _SCRUB_KVWRITE(fd, buf, corrected_errors, use) ||
736 _SCRUB_KVWRITE(fd, buf, last_physical, use) ||
737 _SCRUB_KVWRITE_STATS(fd, buf, t_start, use) ||
738 _SCRUB_KVWRITE_STATS(fd, buf, t_resumed, use) ||
739 _SCRUB_KVWRITE_STATS(fd, buf, duration, use) ||
740 _SCRUB_KVWRITE_STATS(fd, buf, canceled, use) ||
741 _SCRUB_KVWRITE_STATS(fd, buf, finished, use) ||
742 scrub_write_buf(fd, "\n", 1)) {
743 return -EOVERFLOW;
744 }
745 }
746
747 return 0;
748 }
749
750 static int scrub_write_progress(pthread_mutex_t *m, const char *fsid,
751 struct scrub_progress *data, int n)
752 {
753 int ret;
754 int err;
755 int fd = 0;
756 int old;
757
758 ret = pthread_mutex_lock(m);
759 if (ret) {
760 err = -errno;
761 goto out;
762 }
763
764 ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old);
765 if (ret) {
766 err = -ret;
767 goto out;
768 }
769
770 fd = scrub_open_file_w(SCRUB_DATA_FILE, fsid, "tmp");
771 if (fd < 0) {
772 err = fd;
773 goto out;
774 }
775 err = scrub_write_file(fd, fsid, data, n);
776 if (err)
777 goto out;
778 err = scrub_rename_file(SCRUB_DATA_FILE, fsid, "tmp");
779 if (err)
780 goto out;
781
782 out:
783 if (fd > 0) {
784 ret = close(fd);
785 if (ret)
786 err = -errno;
787 }
788
789 ret = pthread_mutex_unlock(m);
790 if (ret && !err)
791 err = -ret;
792
793 ret = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old);
794 if (ret && !err)
795 err = -ret;
796
797 return err;
798 }
799
800 static void *scrub_one_dev(void *ctx)
801 {
802 struct scrub_progress *sp = ctx;
803 int ret;
804 struct timeval tv;
805
806 sp->stats.canceled = 0;
807 sp->stats.duration = 0;
808 sp->stats.finished = 0;
809
810 ret = ioctl(sp->fd, BTRFS_IOC_SCRUB, &sp->scrub_args);
811 gettimeofday(&tv, NULL);
812 sp->ret = ret;
813 sp->stats.duration = tv.tv_sec - sp->stats.t_start;
814 sp->stats.canceled = !!ret;
815 sp->ioctl_errno = errno;
816 ret = pthread_mutex_lock(&sp->progress_mutex);
817 if (ret)
818 return ERR_PTR(-ret);
819 sp->stats.finished = 1;
820 ret = pthread_mutex_unlock(&sp->progress_mutex);
821 if (ret)
822 return ERR_PTR(-ret);
823
824 return NULL;
825 }
826
827 static void *progress_one_dev(void *ctx)
828 {
829 struct scrub_progress *sp = ctx;
830
831 sp->ret = ioctl(sp->fd, BTRFS_IOC_SCRUB_PROGRESS, &sp->scrub_args);
832 sp->ioctl_errno = errno;
833
834 return NULL;
835 }
836
837 static void *scrub_progress_cycle(void *ctx)
838 {
839 int ret;
840 int old;
841 int i;
842 char fsid[37];
843 struct scrub_progress *sp;
844 struct scrub_progress *sp_last;
845 struct scrub_progress *sp_shared;
846 struct timeval tv;
847 struct scrub_progress_cycle *spc = ctx;
848 int ndev = spc->fi->num_devices;
849 int this = 1;
850 int last = 0;
851 int peer_fd = -1;
852 struct pollfd accept_poll_fd = {
853 .fd = spc->prg_fd,
854 .events = POLLIN,
855 .revents = 0,
856 };
857 struct pollfd write_poll_fd = {
858 .events = POLLOUT,
859 .revents = 0,
860 };
861 struct sockaddr_un peer;
862 socklen_t peer_size = sizeof(peer);
863
864 ret = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
865 if (ret)
866 return ERR_PTR(-ret);
867
868 uuid_unparse(spc->fi->fsid, fsid);
869
870 for (i = 0; i < ndev; ++i) {
871 sp = &spc->progress[i];
872 sp_last = &spc->progress[i + ndev];
873 sp_shared = &spc->shared_progress[i];
874 sp->scrub_args.devid = sp_last->scrub_args.devid =
875 sp_shared->scrub_args.devid;
876 sp->fd = sp_last->fd = spc->fdmnt;
877 sp->stats.t_start = sp_last->stats.t_start =
878 sp_shared->stats.t_start;
879 sp->resumed = sp_last->resumed = sp_shared->resumed;
880 sp->skip = sp_last->skip = sp_shared->skip;
881 sp->stats.finished = sp_last->stats.finished =
882 sp_shared->stats.finished;
883 }
884
885 while (1) {
886 ret = poll(&accept_poll_fd, 1, 5 * 1000);
887 if (ret == -1)
888 return ERR_PTR(-errno);
889 if (ret)
890 peer_fd = accept(spc->prg_fd, (struct sockaddr *)&peer,
891 &peer_size);
892 gettimeofday(&tv, NULL);
893 this = (this + 1)%2;
894 last = (last + 1)%2;
895 for (i = 0; i < ndev; ++i) {
896 sp = &spc->progress[this * ndev + i];
897 sp_last = &spc->progress[last * ndev + i];
898 sp_shared = &spc->shared_progress[i];
899 if (sp->stats.finished)
900 continue;
901 progress_one_dev(sp);
902 sp->stats.duration = tv.tv_sec - sp->stats.t_start;
903 if (!sp->ret)
904 continue;
905 if (sp->ioctl_errno != ENOTCONN &&
906 sp->ioctl_errno != ENODEV)
907 return ERR_PTR(-sp->ioctl_errno);
908 /*
909 * scrub finished or device removed, check the
910 * finished flag. if unset, just use the last
911 * result we got for the current write and go
912 * on. flag should be set on next cycle, then.
913 */
914 ret = pthread_mutex_lock(&sp_shared->progress_mutex);
915 if (ret)
916 return ERR_PTR(-ret);
917 if (!sp_shared->stats.finished) {
918 ret = pthread_mutex_unlock(
919 &sp_shared->progress_mutex);
920 if (ret)
921 return ERR_PTR(-ret);
922 memcpy(sp, sp_last, sizeof(*sp));
923 continue;
924 }
925 ret = pthread_mutex_unlock(&sp_shared->progress_mutex);
926 if (ret)
927 return ERR_PTR(-ret);
928 memcpy(sp, sp_shared, sizeof(*sp));
929 memcpy(sp_last, sp_shared, sizeof(*sp));
930 }
931 if (peer_fd != -1) {
932 write_poll_fd.fd = peer_fd;
933 ret = poll(&write_poll_fd, 1, 0);
934 if (ret == -1)
935 return ERR_PTR(-errno);
936 if (ret) {
937 ret = scrub_write_file(
938 peer_fd, fsid,
939 &spc->progress[this * ndev], ndev);
940 if (ret)
941 return ERR_PTR(ret);
942 }
943 close(peer_fd);
944 peer_fd = -1;
945 }
946 if (!spc->do_record)
947 continue;
948 ret = scrub_write_progress(spc->write_mutex, fsid,
949 &spc->progress[this * ndev], ndev);
950 if (ret)
951 return ERR_PTR(ret);
952 }
953 }
954
955 static struct scrub_file_record *last_dev_scrub(
956 struct scrub_file_record *const *const past_scrubs, u64 devid)
957 {
958 int i;
959
960 if (!past_scrubs || IS_ERR(past_scrubs))
961 return NULL;
962
963 for (i = 0; past_scrubs[i]; ++i)
964 if (past_scrubs[i]->devid == devid)
965 return past_scrubs[i];
966
967 return NULL;
968 }
969
970 static int scrub_device_info(int fd, u64 devid,
971 struct btrfs_ioctl_dev_info_args *di_args)
972 {
973 int ret;
974
975 di_args->devid = devid;
976 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
977
978 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
979 return ret ? -errno : 0;
980 }
981
982 static int scrub_fs_info(int fd, char *path,
983 struct btrfs_ioctl_fs_info_args *fi_args,
984 struct btrfs_ioctl_dev_info_args **di_ret)
985 {
986 int ret = 0;
987 int ndevs = 0;
988 int i = 1;
989 struct btrfs_fs_devices *fs_devices_mnt = NULL;
990 struct btrfs_ioctl_dev_info_args *di_args;
991 char mp[BTRFS_PATH_NAME_MAX + 1];
992
993 memset(fi_args, 0, sizeof(*fi_args));
994
995 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
996 if (ret && errno == EINVAL) {
997 /* path is no mounted btrfs. try if it's a device */
998 ret = check_mounted_where(fd, path, mp, sizeof(mp),
999 &fs_devices_mnt);
1000 if (!ret)
1001 return -EINVAL;
1002 if (ret < 0)
1003 return ret;
1004 fi_args->num_devices = 1;
1005 fi_args->max_id = fs_devices_mnt->latest_devid;
1006 i = fs_devices_mnt->latest_devid;
1007 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1008 close(fd);
1009 fd = open_file_or_dir(mp);
1010 if (fd < 0)
1011 return -errno;
1012 } else if (ret) {
1013 return -errno;
1014 }
1015
1016 if (!fi_args->num_devices)
1017 return 0;
1018
1019 di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
1020 if (!di_args)
1021 return -errno;
1022
1023 for (; i <= fi_args->max_id; ++i) {
1024 BUG_ON(ndevs >= fi_args->num_devices);
1025 ret = scrub_device_info(fd, i, &di_args[ndevs]);
1026 if (ret == -ENODEV)
1027 continue;
1028 if (ret)
1029 return ret;
1030 ++ndevs;
1031 }
1032
1033 BUG_ON(ndevs == 0);
1034
1035 return 0;
1036 }
1037
1038 int mkdir_p(char *path)
1039 {
1040 int i;
1041 int ret;
1042
1043 for (i = 1; i < strlen(path); ++i) {
1044 if (path[i] != '/')
1045 continue;
1046 path[i] = '\0';
1047 ret = mkdir(path, 0777);
1048 if (ret && errno != EEXIST)
1049 return 1;
1050 path[i] = '/';
1051 }
1052
1053 return 0;
1054 }
1055
1056 static const char * const cmd_scrub_start_usage[];
1057 static const char * const cmd_scrub_resume_usage[];
1058
1059 static int scrub_start(int argc, char **argv, int resume)
1060 {
1061 int fdmnt;
1062 int prg_fd = -1;
1063 int fdres = -1;
1064 int ret;
1065 pid_t pid;
1066 int c;
1067 int i;
1068 int err = 0;
1069 int e_uncorrectable = 0;
1070 int e_correctable = 0;
1071 int print_raw = 0;
1072 char *path;
1073 int do_background = 1;
1074 int do_wait = 0;
1075 int do_print = 0;
1076 int do_quiet = 0;
1077 int do_record = 1;
1078 int readonly = 0;
1079 int do_stats_per_dev = 0;
1080 int n_start = 0;
1081 int n_skip = 0;
1082 int n_resume = 0;
1083 struct btrfs_ioctl_fs_info_args fi_args;
1084 struct btrfs_ioctl_dev_info_args *di_args = NULL;
1085 struct scrub_progress *sp = NULL;
1086 struct scrub_fs_stat fs_stat;
1087 struct timeval tv;
1088 struct sockaddr_un addr = {
1089 .sun_family = AF_UNIX,
1090 };
1091 pthread_t *t_devs = NULL;
1092 pthread_t t_prog;
1093 pthread_attr_t t_attr;
1094 struct scrub_file_record **past_scrubs = NULL;
1095 struct scrub_file_record *last_scrub = NULL;
1096 char *datafile = strdup(SCRUB_DATA_FILE);
1097 char fsid[37];
1098 char sock_path[BTRFS_PATH_NAME_MAX + 1] = "";
1099 struct scrub_progress_cycle spc;
1100 pthread_mutex_t spc_write_mutex = PTHREAD_MUTEX_INITIALIZER;
1101 void *terr;
1102 u64 devid;
1103
1104 optind = 1;
1105 while ((c = getopt(argc, argv, "BdqrR")) != -1) {
1106 switch (c) {
1107 case 'B':
1108 do_background = 0;
1109 do_wait = 1;
1110 do_print = 1;
1111 break;
1112 case 'd':
1113 do_stats_per_dev = 1;
1114 break;
1115 case 'q':
1116 do_quiet = 1;
1117 break;
1118 case 'r':
1119 readonly = 1;
1120 break;
1121 case 'R':
1122 print_raw = 1;
1123 break;
1124 case '?':
1125 default:
1126 usage(resume ? cmd_scrub_resume_usage :
1127 cmd_scrub_start_usage);
1128 }
1129 }
1130
1131 /* try to catch most error cases before forking */
1132
1133 if (check_argc_exact(argc - optind, 1)) {
1134 usage(resume ? cmd_scrub_resume_usage :
1135 cmd_scrub_start_usage);
1136 }
1137
1138 spc.progress = NULL;
1139 if (do_quiet && do_print)
1140 do_print = 0;
1141
1142 if (mkdir_p(datafile)) {
1143 ERR(!do_quiet, "WARNING: cannot create scrub data "
1144 "file, mkdir %s failed: %s. Status recording "
1145 "disabled\n", datafile, strerror(errno));
1146 do_record = 0;
1147 }
1148 free(datafile);
1149
1150 path = argv[optind];
1151
1152 fdmnt = open_file_or_dir(path);
1153 if (fdmnt < 0) {
1154 ERR(!do_quiet, "ERROR: can't access '%s'\n", path);
1155 return 12;
1156 }
1157
1158 ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args);
1159 if (ret) {
1160 ERR(!do_quiet, "ERROR: getting dev info for scrub failed: "
1161 "%s\n", strerror(-ret));
1162 err = 1;
1163 goto out;
1164 }
1165 if (!fi_args.num_devices) {
1166 ERR(!do_quiet, "ERROR: no devices found\n");
1167 err = 1;
1168 goto out;
1169 }
1170
1171 uuid_unparse(fi_args.fsid, fsid);
1172 fdres = scrub_open_file_r(SCRUB_DATA_FILE, fsid);
1173 if (fdres < 0 && fdres != -ENOENT) {
1174 ERR(!do_quiet, "WARNING: failed to open status file: "
1175 "%s\n", strerror(-fdres));
1176 } else if (fdres >= 0) {
1177 past_scrubs = scrub_read_file(fdres, !do_quiet);
1178 if (IS_ERR(past_scrubs))
1179 ERR(!do_quiet, "WARNING: failed to read status file: "
1180 "%s\n", strerror(-PTR_ERR(past_scrubs)));
1181 close(fdres);
1182 }
1183
1184 t_devs = malloc(fi_args.num_devices * sizeof(*t_devs));
1185 sp = calloc(fi_args.num_devices, sizeof(*sp));
1186 spc.progress = calloc(fi_args.num_devices * 2, sizeof(*spc.progress));
1187
1188 if (!t_devs || !sp || !spc.progress) {
1189 ERR(!do_quiet, "ERROR: scrub failed: %s", strerror(errno));
1190 err = 1;
1191 goto out;
1192 }
1193
1194 ret = pthread_attr_init(&t_attr);
1195 if (ret) {
1196 ERR(!do_quiet, "ERROR: pthread_attr_init failed: %s\n",
1197 strerror(ret));
1198 err = 1;
1199 goto out;
1200 }
1201
1202 for (i = 0; i < fi_args.num_devices; ++i) {
1203 devid = di_args[i].devid;
1204 ret = pthread_mutex_init(&sp[i].progress_mutex, NULL);
1205 if (ret) {
1206 ERR(!do_quiet, "ERROR: pthread_mutex_init failed: "
1207 "%s\n", strerror(ret));
1208 err = 1;
1209 goto out;
1210 }
1211 last_scrub = last_dev_scrub(past_scrubs, devid);
1212 sp[i].scrub_args.devid = devid;
1213 sp[i].fd = fdmnt;
1214 if (resume && last_scrub && (last_scrub->stats.canceled ||
1215 !last_scrub->stats.finished)) {
1216 ++n_resume;
1217 sp[i].scrub_args.start = last_scrub->p.last_physical;
1218 sp[i].resumed = last_scrub;
1219 } else if (resume) {
1220 ++n_skip;
1221 sp[i].skip = 1;
1222 sp[i].resumed = last_scrub;
1223 continue;
1224 } else {
1225 ++n_start;
1226 sp[i].scrub_args.start = 0ll;
1227 sp[i].resumed = NULL;
1228 }
1229 sp[i].skip = 0;
1230 sp[i].scrub_args.end = (u64)-1ll;
1231 sp[i].scrub_args.flags = readonly ? BTRFS_SCRUB_READONLY : 0;
1232 }
1233
1234 if (!n_start && !n_resume) {
1235 if (!do_quiet)
1236 printf("scrub: nothing to resume for %s, fsid %s\n",
1237 path, fsid);
1238 err = 0;
1239 goto out;
1240 }
1241
1242 ret = prg_fd = socket(AF_UNIX, SOCK_STREAM, 0);
1243 while (ret != -1) {
1244 ret = scrub_datafile(SCRUB_PROGRESS_SOCKET_PATH, fsid, NULL,
1245 sock_path, sizeof(sock_path));
1246 /* ignore EOVERFLOW, try using a shorter path for the socket */
1247 addr.sun_path[sizeof(addr.sun_path) - 1] = '\0';
1248 strncpy(addr.sun_path, sock_path, sizeof(addr.sun_path) - 1);
1249 ret = bind(prg_fd, (struct sockaddr *)&addr, sizeof(addr));
1250 if (ret != -1 || errno != EADDRINUSE)
1251 break;
1252 /*
1253 * bind failed with EADDRINUSE. so let's see if anyone answers
1254 * when we make a call to the socket ...
1255 */
1256 ret = connect(prg_fd, (struct sockaddr *)&addr, sizeof(addr));
1257 if (!ret || errno != ECONNREFUSED) {
1258 /* ... yes, so scrub must be running. error out */
1259 fprintf(stderr, "ERROR: scrub already running\n");
1260 close(prg_fd);
1261 goto out;
1262 }
1263 /*
1264 * ... no, this means someone left us alone with an unused
1265 * socket in the file system. remove it and try again.
1266 */
1267 ret = unlink(sock_path);
1268 }
1269 if (ret != -1)
1270 ret = listen(prg_fd, 100);
1271 if (ret == -1) {
1272 ERR(!do_quiet, "WARNING: failed to open the progress status "
1273 "socket at %s: %s. Progress cannot be queried\n",
1274 sock_path[0] ? sock_path : SCRUB_PROGRESS_SOCKET_PATH,
1275 strerror(errno));
1276 if (prg_fd != -1) {
1277 close(prg_fd);
1278 prg_fd = -1;
1279 if (sock_path[0])
1280 unlink(sock_path);
1281 }
1282 }
1283
1284 if (do_record) {
1285 /* write all-zero progress file for a start */
1286 ret = scrub_write_progress(&spc_write_mutex, fsid, sp,
1287 fi_args.num_devices);
1288 if (ret) {
1289 ERR(!do_quiet, "WARNING: failed to write the progress "
1290 "status file: %s. Status recording disabled\n",
1291 strerror(-ret));
1292 do_record = 0;
1293 }
1294 }
1295
1296 if (do_background) {
1297 pid = fork();
1298 if (pid == -1) {
1299 ERR(!do_quiet, "ERROR: cannot scrub, fork failed: "
1300 "%s\n", strerror(errno));
1301 err = 1;
1302 goto out;
1303 }
1304
1305 if (pid) {
1306 int stat;
1307 scrub_handle_sigint_parent();
1308 if (!do_quiet)
1309 printf("scrub %s on %s, fsid %s (pid=%d)\n",
1310 n_start ? "started" : "resumed",
1311 path, fsid, pid);
1312 if (!do_wait) {
1313 err = 0;
1314 goto out;
1315 }
1316 ret = wait(&stat);
1317 if (ret != pid) {
1318 ERR(!do_quiet, "ERROR: wait failed: (ret=%d) "
1319 "%s\n", ret, strerror(errno));
1320 err = 1;
1321 goto out;
1322 }
1323 if (!WIFEXITED(stat) || WEXITSTATUS(stat)) {
1324 ERR(!do_quiet, "ERROR: scrub process failed\n");
1325 err = WIFEXITED(stat) ? WEXITSTATUS(stat) : -1;
1326 goto out;
1327 }
1328 err = 0;
1329 goto out;
1330 }
1331 }
1332
1333 scrub_handle_sigint_child(fdmnt);
1334
1335 for (i = 0; i < fi_args.num_devices; ++i) {
1336 if (sp[i].skip) {
1337 sp[i].scrub_args.progress = sp[i].resumed->p;
1338 sp[i].stats = sp[i].resumed->stats;
1339 sp[i].ret = 0;
1340 sp[i].stats.finished = 1;
1341 continue;
1342 }
1343 devid = di_args[i].devid;
1344 gettimeofday(&tv, NULL);
1345 sp[i].stats.t_start = tv.tv_sec;
1346 ret = pthread_create(&t_devs[i], &t_attr,
1347 scrub_one_dev, &sp[i]);
1348 if (ret) {
1349 if (do_print)
1350 fprintf(stderr, "ERROR: creating "
1351 "scrub_one_dev[%llu] thread failed: "
1352 "%s\n", devid, strerror(ret));
1353 err = 1;
1354 goto out;
1355 }
1356 }
1357
1358 spc.fdmnt = fdmnt;
1359 spc.prg_fd = prg_fd;
1360 spc.do_record = do_record;
1361 spc.write_mutex = &spc_write_mutex;
1362 spc.shared_progress = sp;
1363 spc.fi = &fi_args;
1364 ret = pthread_create(&t_prog, &t_attr, scrub_progress_cycle, &spc);
1365 if (ret) {
1366 if (do_print)
1367 fprintf(stderr, "ERROR: creating progress thread "
1368 "failed: %s\n", strerror(ret));
1369 err = 1;
1370 goto out;
1371 }
1372
1373 err = 0;
1374 for (i = 0; i < fi_args.num_devices; ++i) {
1375 if (sp[i].skip)
1376 continue;
1377 devid = di_args[i].devid;
1378 ret = pthread_join(t_devs[i], NULL);
1379 if (ret) {
1380 if (do_print)
1381 fprintf(stderr, "ERROR: pthread_join failed "
1382 "for scrub_one_dev[%llu]: %s\n", devid,
1383 strerror(ret));
1384 ++err;
1385 continue;
1386 }
1387 if (sp[i].ret && sp[i].ioctl_errno == ENODEV) {
1388 if (do_print)
1389 fprintf(stderr, "WARNING: device %lld not "
1390 "present\n", devid);
1391 continue;
1392 }
1393 if (sp[i].ret && sp[i].ioctl_errno == ECANCELED) {
1394 ++err;
1395 } else if (sp[i].ret) {
1396 if (do_print)
1397 fprintf(stderr, "ERROR: scrubbing %s failed "
1398 "for device id %lld (%s)\n", path,
1399 devid, strerror(sp[i].ioctl_errno));
1400 ++err;
1401 continue;
1402 }
1403 if (sp[i].scrub_args.progress.uncorrectable_errors > 0)
1404 e_uncorrectable++;
1405 if (sp[i].scrub_args.progress.corrected_errors > 0
1406 || sp[i].scrub_args.progress.unverified_errors > 0)
1407 e_correctable++;
1408 }
1409
1410 if (do_print) {
1411 const char *append = "done";
1412 if (!do_stats_per_dev)
1413 init_fs_stat(&fs_stat);
1414 for (i = 0; i < fi_args.num_devices; ++i) {
1415 if (do_stats_per_dev) {
1416 print_scrub_dev(&di_args[i],
1417 &sp[i].scrub_args.progress,
1418 print_raw,
1419 sp[i].ret ? "canceled" : "done",
1420 &sp[i].stats);
1421 } else {
1422 if (sp[i].ret)
1423 append = "canceled";
1424 add_to_fs_stat(&sp[i].scrub_args.progress,
1425 &sp[i].stats, &fs_stat);
1426 }
1427 }
1428 if (!do_stats_per_dev) {
1429 printf("scrub %s for %s\n", append, fsid);
1430 print_fs_stat(&fs_stat, print_raw);
1431 }
1432 }
1433
1434 ret = pthread_cancel(t_prog);
1435 if (!ret)
1436 ret = pthread_join(t_prog, &terr);
1437 if (do_print && ret) {
1438 fprintf(stderr, "ERROR: progress thead handling failed: %s\n",
1439 strerror(ret));
1440 }
1441
1442 if (do_print && terr && terr != PTHREAD_CANCELED) {
1443 fprintf(stderr, "ERROR: recording progress "
1444 "failed: %s\n", strerror(-PTR_ERR(terr)));
1445 }
1446
1447 if (do_record) {
1448 ret = scrub_write_progress(&spc_write_mutex, fsid, sp,
1449 fi_args.num_devices);
1450 if (ret && do_print) {
1451 fprintf(stderr, "ERROR: failed to record the result: "
1452 "%s\n", strerror(-ret));
1453 }
1454 }
1455
1456 scrub_handle_sigint_child(-1);
1457
1458 out:
1459 free_history(past_scrubs);
1460 free(di_args);
1461 free(t_devs);
1462 free(sp);
1463 free(spc.progress);
1464 if (prg_fd > -1) {
1465 close(prg_fd);
1466 if (sock_path[0])
1467 unlink(sock_path);
1468 }
1469 close(fdmnt);
1470
1471 if (err)
1472 return 1;
1473 if (e_correctable)
1474 return 7;
1475 if (e_uncorrectable)
1476 return 8;
1477 return 0;
1478 }
1479
1480 static const char * const cmd_scrub_start_usage[] = {
1481 "btrfs scrub start [-Bdqr] <path>|<device>",
1482 "Start a new scrub",
1483 "",
1484 "-B do not background",
1485 "-d stats per device (-B only)",
1486 "-q be quiet",
1487 "-r read only mode",
1488 NULL
1489 };
1490
1491 static int cmd_scrub_start(int argc, char **argv)
1492 {
1493 return scrub_start(argc, argv, 0);
1494 }
1495
1496 static const char * const cmd_scrub_cancel_usage[] = {
1497 "btrfs scrub cancel <path>|<device>",
1498 "Cancel a running scrub",
1499 NULL
1500 };
1501
1502 static int cmd_scrub_cancel(int argc, char **argv)
1503 {
1504 char *path;
1505 int ret;
1506 int fdmnt;
1507 int err;
1508 char mp[BTRFS_PATH_NAME_MAX + 1];
1509 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1510
1511 if (check_argc_exact(argc, 2))
1512 usage(cmd_scrub_cancel_usage);
1513
1514 path = argv[1];
1515
1516 fdmnt = open_file_or_dir(path);
1517 if (fdmnt < 0) {
1518 fprintf(stderr, "ERROR: scrub cancel failed\n");
1519 return 12;
1520 }
1521
1522 again:
1523 ret = ioctl(fdmnt, BTRFS_IOC_SCRUB_CANCEL, NULL);
1524 err = errno;
1525 close(fdmnt);
1526
1527 if (ret && err == EINVAL) {
1528 /* path is no mounted btrfs. try if it's a device */
1529 ret = check_mounted_where(fdmnt, path, mp, sizeof(mp),
1530 &fs_devices_mnt);
1531 close(fdmnt);
1532 if (ret) {
1533 fdmnt = open_file_or_dir(mp);
1534 if (fdmnt >= 0) {
1535 path = mp;
1536 goto again;
1537 }
1538 }
1539 }
1540
1541 if (ret) {
1542 fprintf(stderr, "ERROR: scrub cancel failed on %s: %s\n", path,
1543 err == ENOTCONN ? "not running" : strerror(errno));
1544 return 1;
1545 }
1546
1547 printf("scrub cancelled\n");
1548
1549 return 0;
1550 }
1551
1552 static const char * const cmd_scrub_resume_usage[] = {
1553 "btrfs scrub resume [-Bdqr] <path>|<device>",
1554 "Resume previously canceled or interrupted scrub",
1555 "",
1556 "-B do not background",
1557 "-d stats per device (-B only)",
1558 "-q be quiet",
1559 "-r read only mode",
1560 NULL
1561 };
1562
1563 static int cmd_scrub_resume(int argc, char **argv)
1564 {
1565 return scrub_start(argc, argv, 1);
1566 }
1567
1568 static const char * const cmd_scrub_status_usage[] = {
1569 "btrfs scrub status [-dR] <path>|<device>",
1570 "Show status of running or finished scrub",
1571 "",
1572 "-d stats per device",
1573 "-R print raw stats",
1574 NULL
1575 };
1576
1577 static int cmd_scrub_status(int argc, char **argv)
1578 {
1579 char *path;
1580 struct btrfs_ioctl_fs_info_args fi_args;
1581 struct btrfs_ioctl_dev_info_args *di_args = NULL;
1582 struct scrub_file_record **past_scrubs = NULL;
1583 struct scrub_file_record *last_scrub;
1584 struct scrub_fs_stat fs_stat;
1585 struct sockaddr_un addr = {
1586 .sun_family = AF_UNIX,
1587 };
1588 int ret;
1589 int fdmnt;
1590 int i;
1591 int print_raw = 0;
1592 int do_stats_per_dev = 0;
1593 char c;
1594 char fsid[37];
1595 int fdres = -1;
1596 int err = 0;
1597
1598 optind = 1;
1599 while ((c = getopt(argc, argv, "dR")) != -1) {
1600 switch (c) {
1601 case 'd':
1602 do_stats_per_dev = 1;
1603 break;
1604 case 'R':
1605 print_raw = 1;
1606 break;
1607 case '?':
1608 default:
1609 usage(cmd_scrub_status_usage);
1610 }
1611 }
1612
1613 if (check_argc_exact(argc - optind, 1))
1614 usage(cmd_scrub_status_usage);
1615
1616 path = argv[optind];
1617
1618 fdmnt = open_file_or_dir(path);
1619 if (fdmnt < 0) {
1620 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
1621 return 12;
1622 }
1623
1624 ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args);
1625 if (ret) {
1626 fprintf(stderr, "ERROR: getting dev info for scrub failed: "
1627 "%s\n", strerror(-ret));
1628 err = 1;
1629 goto out;
1630 }
1631 if (!fi_args.num_devices) {
1632 fprintf(stderr, "ERROR: no devices found\n");
1633 err = 1;
1634 goto out;
1635 }
1636
1637 uuid_unparse(fi_args.fsid, fsid);
1638
1639 fdres = socket(AF_UNIX, SOCK_STREAM, 0);
1640 if (fdres == -1) {
1641 fprintf(stderr, "ERROR: failed to create socket to "
1642 "receive progress information: %s\n",
1643 strerror(errno));
1644 err = 1;
1645 goto out;
1646 }
1647 scrub_datafile(SCRUB_PROGRESS_SOCKET_PATH, fsid,
1648 NULL, addr.sun_path, sizeof(addr.sun_path));
1649 /* ignore EOVERFLOW, just use shorter name and hope for the best */
1650 addr.sun_path[sizeof(addr.sun_path) - 1] = '\0';
1651 ret = connect(fdres, (struct sockaddr *)&addr, sizeof(addr));
1652 if (ret == -1) {
1653 fdres = scrub_open_file_r(SCRUB_DATA_FILE, fsid);
1654 if (fdres < 0 && fdres != -ENOENT) {
1655 fprintf(stderr, "WARNING: failed to open status file: "
1656 "%s\n", strerror(-fdres));
1657 err = 1;
1658 goto out;
1659 }
1660 }
1661
1662 if (fdres >= 0) {
1663 past_scrubs = scrub_read_file(fdres, 1);
1664 if (IS_ERR(past_scrubs))
1665 fprintf(stderr, "WARNING: failed to read status: %s\n",
1666 strerror(-PTR_ERR(past_scrubs)));
1667 }
1668
1669 printf("scrub status for %s\n", fsid);
1670
1671 if (do_stats_per_dev) {
1672 for (i = 0; i < fi_args.num_devices; ++i) {
1673 last_scrub = last_dev_scrub(past_scrubs,
1674 di_args[i].devid);
1675 if (!last_scrub) {
1676 print_scrub_dev(&di_args[i], NULL, print_raw,
1677 NULL, NULL);
1678 continue;
1679 }
1680 print_scrub_dev(&di_args[i], &last_scrub->p, print_raw,
1681 last_scrub->stats.finished ?
1682 "history" : "status",
1683 &last_scrub->stats);
1684 }
1685 } else {
1686 init_fs_stat(&fs_stat);
1687 for (i = 0; i < fi_args.num_devices; ++i) {
1688 last_scrub = last_dev_scrub(past_scrubs,
1689 di_args[i].devid);
1690 if (!last_scrub)
1691 continue;
1692 add_to_fs_stat(&last_scrub->p, &last_scrub->stats,
1693 &fs_stat);
1694 }
1695 print_fs_stat(&fs_stat, print_raw);
1696 }
1697
1698 out:
1699 free_history(past_scrubs);
1700 free(di_args);
1701 close(fdmnt);
1702 if (fdres > -1)
1703 close(fdres);
1704
1705 return err;
1706 }
1707
1708 const struct cmd_group scrub_cmd_group = {
1709 scrub_cmd_group_usage, NULL, {
1710 { "start", cmd_scrub_start, cmd_scrub_start_usage, NULL, 0 },
1711 { "cancel", cmd_scrub_cancel, cmd_scrub_cancel_usage, NULL, 0 },
1712 { "resume", cmd_scrub_resume, cmd_scrub_resume_usage, NULL, 0 },
1713 { "status", cmd_scrub_status, cmd_scrub_status_usage, NULL, 0 },
1714 { 0, 0, 0, 0, 0 }
1715 }
1716 };
1717
1718 int cmd_scrub(int argc, char **argv)
1719 {
1720 return handle_command_group(&scrub_cmd_group, argc, argv);
1721 }
(deprecated) Btrfs progs developments and patch integration