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sd: remove 'ssd' driver support
[unleashed/tickless.git] / usr / src / lib / libzfs / common / libzfs_diff.c
blobe0c3d96238df9c74d49321bc7fd3fe6323048499
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2015 by Delphix. All rights reserved.
26 * Copyright 2016 Joyent, Inc.
27 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
28 */
29
30 /*
31 * zfs diff support
32 */
33 #include <ctype.h>
34 #include <errno.h>
35 #include <libintl.h>
36 #include <string.h>
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 #include <attr.h>
41 #include <stddef.h>
42 #include <unistd.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <stropts.h>
46 #include <pthread.h>
47 #include <sys/zfs_ioctl.h>
48 #include <libzfs.h>
49 #include "libzfs_impl.h"
50
51 #define ZDIFF_SNAPDIR "/.zfs/snapshot/"
52 #define ZDIFF_SHARESDIR "/.zfs/shares/"
53 #define ZDIFF_PREFIX "zfs-diff-%d"
54
55 #define ZDIFF_ADDED '+'
56 #define ZDIFF_MODIFIED 'M'
57 #define ZDIFF_REMOVED '-'
58 #define ZDIFF_RENAMED 'R'
59
60 typedef struct differ_info {
61 zfs_handle_t *zhp;
62 char *fromsnap;
63 char *frommnt;
64 char *tosnap;
65 char *tomnt;
66 char *ds;
67 char *dsmnt;
68 char *tmpsnap;
69 char errbuf[1024];
70 boolean_t isclone;
71 boolean_t scripted;
72 boolean_t classify;
73 boolean_t timestamped;
74 uint64_t shares;
75 int zerr;
76 int cleanupfd;
77 int outputfd;
78 int datafd;
79 } differ_info_t;
80
81 /*
82 * Given a {dsname, object id}, get the object path
83 */
84 static int
85 get_stats_for_obj(differ_info_t *di, const char *dsname, uint64_t obj,
86 char *pn, int maxlen, zfs_stat_t *sb)
87 {
88 zfs_cmd_t zc = { 0 };
89 int error;
90
91 (void) strlcpy(zc.zc_name, dsname, sizeof (zc.zc_name));
92 zc.zc_obj = obj;
93
94 errno = 0;
95 error = ioctl(di->zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJ_TO_STATS, &zc);
96 di->zerr = errno;
97
98 /* we can get stats even if we failed to get a path */
99 (void) memcpy(sb, &zc.zc_stat, sizeof (zfs_stat_t));
100 if (error == 0) {
101 ASSERT(di->zerr == 0);
102 (void) strlcpy(pn, zc.zc_value, maxlen);
103 return (0);
104 }
105
106 if (di->zerr == EPERM) {
107 (void) snprintf(di->errbuf, sizeof (di->errbuf),
108 dgettext(TEXT_DOMAIN,
109 "The sys_config privilege or diff delegated permission "
110 "is needed\nto discover path names"));
111 return (-1);
112 } else {
113 (void) snprintf(di->errbuf, sizeof (di->errbuf),
114 dgettext(TEXT_DOMAIN,
115 "Unable to determine path or stats for "
116 "object %lld in %s"), obj, dsname);
117 return (-1);
118 }
119 }
120
121 /*
122 * stream_bytes
123 *
124 * Prints a file name out a character at a time. If the character is
125 * not in the range of what we consider "printable" ASCII, display it
126 * as an escaped 3-digit octal value. ASCII values less than a space
127 * are all control characters and we declare the upper end as the
128 * DELete character. This also is the last 7-bit ASCII character.
129 * We choose to treat all 8-bit ASCII as not printable for this
130 * application.
131 */
132 static void
133 stream_bytes(FILE *fp, const char *string)
134 {
135 char c;
136
137 while ((c = *string++) != '\0') {
138 if (c > ' ' && c != '\\' && c < '\177') {
139 (void) fprintf(fp, "%c", c);
140 } else {
141 (void) fprintf(fp, "\\%03o", (uint8_t)c);
142 }
143 }
144 }
145
146 static void
147 print_what(FILE *fp, mode_t what)
148 {
149 char symbol;
150
151 switch (what & S_IFMT) {
152 case S_IFBLK:
153 symbol = 'B';
154 break;
155 case S_IFCHR:
156 symbol = 'C';
157 break;
158 case S_IFDIR:
159 symbol = '/';
160 break;
161 case S_IFDOOR:
162 symbol = '>';
163 break;
164 case S_IFIFO:
165 symbol = '|';
166 break;
167 case S_IFLNK:
168 symbol = '@';
169 break;
170 case S_IFPORT:
171 symbol = 'P';
172 break;
173 case S_IFSOCK:
174 symbol = '=';
175 break;
176 case S_IFREG:
177 symbol = 'F';
178 break;
179 default:
180 symbol = '?';
181 break;
182 }
183 (void) fprintf(fp, "%c", symbol);
184 }
185
186 static void
187 print_cmn(FILE *fp, differ_info_t *di, const char *file)
188 {
189 stream_bytes(fp, di->dsmnt);
190 stream_bytes(fp, file);
191 }
192
193 static void
194 print_rename(FILE *fp, differ_info_t *di, const char *old, const char *new,
195 zfs_stat_t *isb)
196 {
197 if (di->timestamped)
198 (void) fprintf(fp, "%10lld.%09lld\t",
199 (longlong_t)isb->zs_ctime[0],
200 (longlong_t)isb->zs_ctime[1]);
201 (void) fprintf(fp, "%c\t", ZDIFF_RENAMED);
202 if (di->classify) {
203 print_what(fp, isb->zs_mode);
204 (void) fprintf(fp, "\t");
205 }
206 print_cmn(fp, di, old);
207 if (di->scripted)
208 (void) fprintf(fp, "\t");
209 else
210 (void) fprintf(fp, " -> ");
211 print_cmn(fp, di, new);
212 (void) fprintf(fp, "\n");
213 }
214
215 static void
216 print_link_change(FILE *fp, differ_info_t *di, int delta, const char *file,
217 zfs_stat_t *isb)
218 {
219 if (di->timestamped)
220 (void) fprintf(fp, "%10lld.%09lld\t",
221 (longlong_t)isb->zs_ctime[0],
222 (longlong_t)isb->zs_ctime[1]);
223 (void) fprintf(fp, "%c\t", ZDIFF_MODIFIED);
224 if (di->classify) {
225 print_what(fp, isb->zs_mode);
226 (void) fprintf(fp, "\t");
227 }
228 print_cmn(fp, di, file);
229 (void) fprintf(fp, "\t(%+d)", delta);
230 (void) fprintf(fp, "\n");
231 }
232
233 static void
234 print_file(FILE *fp, differ_info_t *di, char type, const char *file,
235 zfs_stat_t *isb)
236 {
237 if (di->timestamped)
238 (void) fprintf(fp, "%10lld.%09lld\t",
239 (longlong_t)isb->zs_ctime[0],
240 (longlong_t)isb->zs_ctime[1]);
241 (void) fprintf(fp, "%c\t", type);
242 if (di->classify) {
243 print_what(fp, isb->zs_mode);
244 (void) fprintf(fp, "\t");
245 }
246 print_cmn(fp, di, file);
247 (void) fprintf(fp, "\n");
248 }
249
250 static int
251 write_inuse_diffs_one(FILE *fp, differ_info_t *di, uint64_t dobj)
252 {
253 struct zfs_stat fsb, tsb;
254 mode_t fmode, tmode;
255 char fobjname[MAXPATHLEN], tobjname[MAXPATHLEN];
256 int fobjerr, tobjerr;
257 int change;
258
259 if (dobj == di->shares)
260 return (0);
261
262 /*
263 * Check the from and to snapshots for info on the object. If
264 * we get ENOENT, then the object just didn't exist in that
265 * snapshot. If we get ENOTSUP, then we tried to get
266 * info on a non-ZPL object, which we don't care about anyway.
267 */
268 fobjerr = get_stats_for_obj(di, di->fromsnap, dobj, fobjname,
269 MAXPATHLEN, &fsb);
270 if (fobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP)
271 return (-1);
272
273 tobjerr = get_stats_for_obj(di, di->tosnap, dobj, tobjname,
274 MAXPATHLEN, &tsb);
275 if (tobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP)
276 return (-1);
277
278 /*
279 * Unallocated object sharing the same meta dnode block
280 */
281 if (fobjerr && tobjerr) {
282 ASSERT(di->zerr == ENOENT || di->zerr == ENOTSUP);
283 di->zerr = 0;
284 return (0);
285 }
286
287 di->zerr = 0; /* negate get_stats_for_obj() from side that failed */
288 fmode = fsb.zs_mode & S_IFMT;
289 tmode = tsb.zs_mode & S_IFMT;
290 if (fmode == S_IFDIR || tmode == S_IFDIR || fsb.zs_links == 0 ||
291 tsb.zs_links == 0)
292 change = 0;
293 else
294 change = tsb.zs_links - fsb.zs_links;
295
296 if (fobjerr) {
297 if (change) {
298 print_link_change(fp, di, change, tobjname, &tsb);
299 return (0);
300 }
301 print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb);
302 return (0);
303 } else if (tobjerr) {
304 if (change) {
305 print_link_change(fp, di, change, fobjname, &fsb);
306 return (0);
307 }
308 print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb);
309 return (0);
310 }
311
312 if (fmode != tmode && fsb.zs_gen == tsb.zs_gen)
313 tsb.zs_gen++; /* Force a generational difference */
314
315 /* Simple modification or no change */
316 if (fsb.zs_gen == tsb.zs_gen) {
317 /* No apparent changes. Could we assert !this? */
318 if (fsb.zs_ctime[0] == tsb.zs_ctime[0] &&
319 fsb.zs_ctime[1] == tsb.zs_ctime[1])
320 return (0);
321 if (change) {
322 print_link_change(fp, di, change,
323 change > 0 ? fobjname : tobjname, &tsb);
324 } else if (strcmp(fobjname, tobjname) == 0) {
325 print_file(fp, di, ZDIFF_MODIFIED, fobjname, &tsb);
326 } else {
327 print_rename(fp, di, fobjname, tobjname, &tsb);
328 }
329 return (0);
330 } else {
331 /* file re-created or object re-used */
332 print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb);
333 print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb);
334 return (0);
335 }
336 }
337
338 static int
339 write_inuse_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr)
340 {
341 uint64_t o;
342 int err;
343
344 for (o = dr->ddr_first; o <= dr->ddr_last; o++) {
345 if ((err = write_inuse_diffs_one(fp, di, o)) != 0)
346 return (err);
347 }
348 return (0);
349 }
350
351 static int
352 describe_free(FILE *fp, differ_info_t *di, uint64_t object, char *namebuf,
353 int maxlen)
354 {
355 struct zfs_stat sb;
356
357 if (get_stats_for_obj(di, di->fromsnap, object, namebuf,
358 maxlen, &sb) != 0) {
359 /* Let it slide, if in the delete queue on from side */
360 if (di->zerr == ENOENT && sb.zs_links == 0) {
361 di->zerr = 0;
362 return (0);
363 }
364 return (-1);
365 }
366
367 print_file(fp, di, ZDIFF_REMOVED, namebuf, &sb);
368 return (0);
369 }
370
371 static int
372 write_free_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr)
373 {
374 zfs_cmd_t zc = { 0 };
375 libzfs_handle_t *lhdl = di->zhp->zfs_hdl;
376 char fobjname[MAXPATHLEN];
377
378 (void) strlcpy(zc.zc_name, di->fromsnap, sizeof (zc.zc_name));
379 zc.zc_obj = dr->ddr_first - 1;
380
381 ASSERT(di->zerr == 0);
382
383 while (zc.zc_obj < dr->ddr_last) {
384 int err;
385
386 err = ioctl(lhdl->libzfs_fd, ZFS_IOC_NEXT_OBJ, &zc);
387 if (err == 0) {
388 if (zc.zc_obj == di->shares) {
389 zc.zc_obj++;
390 continue;
391 }
392 if (zc.zc_obj > dr->ddr_last) {
393 break;
394 }
395 err = describe_free(fp, di, zc.zc_obj, fobjname,
396 MAXPATHLEN);
397 if (err)
398 break;
399 } else if (errno == ESRCH) {
400 break;
401 } else {
402 (void) snprintf(di->errbuf, sizeof (di->errbuf),
403 dgettext(TEXT_DOMAIN,
404 "next allocated object (> %lld) find failure"),
405 zc.zc_obj);
406 di->zerr = errno;
407 break;
408 }
409 }
410 if (di->zerr)
411 return (-1);
412 return (0);
413 }
414
415 static void *
416 differ(void *arg)
417 {
418 differ_info_t *di = arg;
419 dmu_diff_record_t dr;
420 FILE *ofp;
421 int err = 0;
422
423 if ((ofp = fdopen(di->outputfd, "w")) == NULL) {
424 di->zerr = errno;
425 (void) strerror_r(errno, di->errbuf, sizeof (di->errbuf));
426 (void) close(di->datafd);
427 return ((void *)-1);
428 }
429
430 for (;;) {
431 char *cp = (char *)&dr;
432 int len = sizeof (dr);
433 int rv;
434
435 do {
436 rv = read(di->datafd, cp, len);
437 cp += rv;
438 len -= rv;
439 } while (len > 0 && rv > 0);
440
441 if (rv < 0 || (rv == 0 && len != sizeof (dr))) {
442 di->zerr = EPIPE;
443 break;
444 } else if (rv == 0) {
445 /* end of file at a natural breaking point */
446 break;
447 }
448
449 switch (dr.ddr_type) {
450 case DDR_FREE:
451 err = write_free_diffs(ofp, di, &dr);
452 break;
453 case DDR_INUSE:
454 err = write_inuse_diffs(ofp, di, &dr);
455 break;
456 default:
457 di->zerr = EPIPE;
458 break;
459 }
460
461 if (err || di->zerr)
462 break;
463 }
464
465 (void) fclose(ofp);
466 (void) close(di->datafd);
467 if (err)
468 return ((void *)-1);
469 if (di->zerr) {
470 ASSERT(di->zerr == EINVAL);
471 (void) snprintf(di->errbuf, sizeof (di->errbuf),
472 dgettext(TEXT_DOMAIN,
473 "Internal error: bad data from diff IOCTL"));
474 return ((void *)-1);
475 }
476 return (NULL);
477 }
478
479 static int
480 find_shares_object(differ_info_t *di)
481 {
482 char fullpath[MAXPATHLEN];
483 struct stat64 sb = { 0 };
484
485 (void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN);
486 (void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN);
487
488 if (stat64(fullpath, &sb) != 0) {
489 (void) snprintf(di->errbuf, sizeof (di->errbuf),
490 dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath);
491 return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf));
492 }
493
494 di->shares = (uint64_t)sb.st_ino;
495 return (0);
496 }
497
498 static int
499 make_temp_snapshot(differ_info_t *di)
500 {
501 libzfs_handle_t *hdl = di->zhp->zfs_hdl;
502 zfs_cmd_t zc = { 0 };
503
504 (void) snprintf(zc.zc_value, sizeof (zc.zc_value),
505 ZDIFF_PREFIX, getpid());
506 (void) strlcpy(zc.zc_name, di->ds, sizeof (zc.zc_name));
507 zc.zc_cleanup_fd = di->cleanupfd;
508
509 if (ioctl(hdl->libzfs_fd, ZFS_IOC_TMP_SNAPSHOT, &zc) != 0) {
510 int err = errno;
511 if (err == EPERM) {
512 (void) snprintf(di->errbuf, sizeof (di->errbuf),
513 dgettext(TEXT_DOMAIN, "The diff delegated "
514 "permission is needed in order\nto create a "
515 "just-in-time snapshot for diffing\n"));
516 return (zfs_error(hdl, EZFS_DIFF, di->errbuf));
517 } else {
518 (void) snprintf(di->errbuf, sizeof (di->errbuf),
519 dgettext(TEXT_DOMAIN, "Cannot create just-in-time "
520 "snapshot of '%s'"), zc.zc_name);
521 return (zfs_standard_error(hdl, err, di->errbuf));
522 }
523 }
524
525 di->tmpsnap = zfs_strdup(hdl, zc.zc_value);
526 di->tosnap = zfs_asprintf(hdl, "%s@%s", di->ds, di->tmpsnap);
527 return (0);
528 }
529
530 static void
531 teardown_differ_info(differ_info_t *di)
532 {
533 free(di->ds);
534 free(di->dsmnt);
535 free(di->fromsnap);
536 free(di->frommnt);
537 free(di->tosnap);
538 free(di->tmpsnap);
539 free(di->tomnt);
540 (void) close(di->cleanupfd);
541 }
542
543 static int
544 get_snapshot_names(differ_info_t *di, const char *fromsnap,
545 const char *tosnap)
546 {
547 libzfs_handle_t *hdl = di->zhp->zfs_hdl;
548 char *atptrf = NULL;
549 char *atptrt = NULL;
550 int fdslen, fsnlen;
551 int tdslen, tsnlen;
552
553 /*
554 * Can accept
555 * dataset@snap1
556 * dataset@snap1 dataset@snap2
557 * dataset@snap1 @snap2
558 * dataset@snap1 dataset
559 * @snap1 dataset@snap2
560 */
561 if (tosnap == NULL) {
562 /* only a from snapshot given, must be valid */
563 (void) snprintf(di->errbuf, sizeof (di->errbuf),
564 dgettext(TEXT_DOMAIN,
565 "Badly formed snapshot name %s"), fromsnap);
566
567 if (!zfs_validate_name(hdl, fromsnap, ZFS_TYPE_SNAPSHOT,
568 B_FALSE)) {
569 return (zfs_error(hdl, EZFS_INVALIDNAME,
570 di->errbuf));
571 }
572
573 atptrf = strchr(fromsnap, '@');
574 ASSERT(atptrf != NULL);
575 fdslen = atptrf - fromsnap;
576
577 di->fromsnap = zfs_strdup(hdl, fromsnap);
578 di->ds = zfs_strdup(hdl, fromsnap);
579 di->ds[fdslen] = '\0';
580
581 /* the to snap will be a just-in-time snap of the head */
582 return (make_temp_snapshot(di));
583 }
584
585 (void) snprintf(di->errbuf, sizeof (di->errbuf),
586 dgettext(TEXT_DOMAIN,
587 "Unable to determine which snapshots to compare"));
588
589 atptrf = strchr(fromsnap, '@');
590 atptrt = strchr(tosnap, '@');
591 fdslen = atptrf ? atptrf - fromsnap : strlen(fromsnap);
592 tdslen = atptrt ? atptrt - tosnap : strlen(tosnap);
593 fsnlen = strlen(fromsnap) - fdslen; /* includes @ sign */
594 tsnlen = strlen(tosnap) - tdslen; /* includes @ sign */
595
596 if (fsnlen <= 1 || tsnlen == 1 || (fdslen == 0 && tdslen == 0) ||
597 (fsnlen == 0 && tsnlen == 0)) {
598 return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf));
599 } else if ((fdslen > 0 && tdslen > 0) &&
600 ((tdslen != fdslen || strncmp(fromsnap, tosnap, fdslen) != 0))) {
601 /*
602 * not the same dataset name, might be okay if
603 * tosnap is a clone of a fromsnap descendant.
604 */
605 char origin[ZFS_MAX_DATASET_NAME_LEN];
606 zprop_source_t src;
607 zfs_handle_t *zhp;
608
609 di->ds = zfs_alloc(di->zhp->zfs_hdl, tdslen + 1);
610 (void) strncpy(di->ds, tosnap, tdslen);
611 di->ds[tdslen] = '\0';
612
613 zhp = zfs_open(hdl, di->ds, ZFS_TYPE_FILESYSTEM);
614 while (zhp != NULL) {
615 if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin,
616 sizeof (origin), &src, NULL, 0, B_FALSE) != 0) {
617 (void) zfs_close(zhp);
618 zhp = NULL;
619 break;
620 }
621 if (strncmp(origin, fromsnap, fsnlen) == 0)
622 break;
623
624 (void) zfs_close(zhp);
625 zhp = zfs_open(hdl, origin, ZFS_TYPE_FILESYSTEM);
626 }
627
628 if (zhp == NULL) {
629 (void) snprintf(di->errbuf, sizeof (di->errbuf),
630 dgettext(TEXT_DOMAIN,
631 "Not an earlier snapshot from the same fs"));
632 return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf));
633 } else {
634 (void) zfs_close(zhp);
635 }
636
637 di->isclone = B_TRUE;
638 di->fromsnap = zfs_strdup(hdl, fromsnap);
639 if (tsnlen) {
640 di->tosnap = zfs_strdup(hdl, tosnap);
641 } else {
642 return (make_temp_snapshot(di));
643 }
644 } else {
645 int dslen = fdslen ? fdslen : tdslen;
646
647 di->ds = zfs_alloc(hdl, dslen + 1);
648 (void) strncpy(di->ds, fdslen ? fromsnap : tosnap, dslen);
649 di->ds[dslen] = '\0';
650
651 di->fromsnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrf);
652 if (tsnlen) {
653 di->tosnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrt);
654 } else {
655 return (make_temp_snapshot(di));
656 }
657 }
658 return (0);
659 }
660
661 static int
662 get_mountpoint(differ_info_t *di, char *dsnm, char **mntpt)
663 {
664 boolean_t mounted;
665
666 mounted = is_mounted(di->zhp->zfs_hdl, dsnm, mntpt);
667 if (mounted == B_FALSE) {
668 (void) snprintf(di->errbuf, sizeof (di->errbuf),
669 dgettext(TEXT_DOMAIN,
670 "Cannot diff an unmounted snapshot"));
671 return (zfs_error(di->zhp->zfs_hdl, EZFS_BADTYPE, di->errbuf));
672 }
673
674 /* Avoid a double slash at the beginning of root-mounted datasets */
675 if (**mntpt == '/' && *(*mntpt + 1) == '\0')
676 **mntpt = '\0';
677 return (0);
678 }
679
680 static int
681 get_mountpoints(differ_info_t *di)
682 {
683 char *strptr;
684 char *frommntpt;
685
686 /*
687 * first get the mountpoint for the parent dataset
688 */
689 if (get_mountpoint(di, di->ds, &di->dsmnt) != 0)
690 return (-1);
691
692 strptr = strchr(di->tosnap, '@');
693 ASSERT3P(strptr, !=, NULL);
694 di->tomnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", di->dsmnt,
695 ZDIFF_SNAPDIR, ++strptr);
696
697 strptr = strchr(di->fromsnap, '@');
698 ASSERT3P(strptr, !=, NULL);
699
700 frommntpt = di->dsmnt;
701 if (di->isclone) {
702 char *mntpt;
703 int err;
704
705 *strptr = '\0';
706 err = get_mountpoint(di, di->fromsnap, &mntpt);
707 *strptr = '@';
708 if (err != 0)
709 return (-1);
710 frommntpt = mntpt;
711 }
712
713 di->frommnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", frommntpt,
714 ZDIFF_SNAPDIR, ++strptr);
715
716 if (di->isclone)
717 free(frommntpt);
718
719 return (0);
720 }
721
722 static int
723 setup_differ_info(zfs_handle_t *zhp, const char *fromsnap,
724 const char *tosnap, differ_info_t *di)
725 {
726 di->zhp = zhp;
727
728 di->cleanupfd = open(ZFS_DEV, O_RDWR|O_EXCL);
729 VERIFY(di->cleanupfd >= 0);
730
731 if (get_snapshot_names(di, fromsnap, tosnap) != 0)
732 return (-1);
733
734 if (get_mountpoints(di) != 0)
735 return (-1);
736
737 if (find_shares_object(di) != 0)
738 return (-1);
739
740 return (0);
741 }
742
743 int
744 zfs_show_diffs(zfs_handle_t *zhp, int outfd, const char *fromsnap,
745 const char *tosnap, int flags)
746 {
747 zfs_cmd_t zc = { 0 };
748 char errbuf[1024];
749 differ_info_t di = { 0 };
750 pthread_t tid;
751 int pipefd[2];
752 int iocerr;
753
754 (void) snprintf(errbuf, sizeof (errbuf),
755 dgettext(TEXT_DOMAIN, "zfs diff failed"));
756
757 if (setup_differ_info(zhp, fromsnap, tosnap, &di)) {
758 teardown_differ_info(&di);
759 return (-1);
760 }
761
762 if (pipe(pipefd)) {
763 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
764 teardown_differ_info(&di);
765 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, errbuf));
766 }
767
768 di.scripted = (flags & ZFS_DIFF_PARSEABLE);
769 di.classify = (flags & ZFS_DIFF_CLASSIFY);
770 di.timestamped = (flags & ZFS_DIFF_TIMESTAMP);
771
772 di.outputfd = outfd;
773 di.datafd = pipefd[0];
774
775 if (pthread_create(&tid, NULL, differ, &di)) {
776 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
777 (void) close(pipefd[0]);
778 (void) close(pipefd[1]);
779 teardown_differ_info(&di);
780 return (zfs_error(zhp->zfs_hdl,
781 EZFS_THREADCREATEFAILED, errbuf));
782 }
783
784 /* do the ioctl() */
785 (void) strlcpy(zc.zc_value, di.fromsnap, strlen(di.fromsnap) + 1);
786 (void) strlcpy(zc.zc_name, di.tosnap, strlen(di.tosnap) + 1);
787 zc.zc_cookie = pipefd[1];
788
789 iocerr = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DIFF, &zc);
790 if (iocerr != 0) {
791 (void) snprintf(errbuf, sizeof (errbuf),
792 dgettext(TEXT_DOMAIN, "Unable to obtain diffs"));
793 if (errno == EPERM) {
794 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
795 "\n The sys_mount privilege or diff delegated "
796 "permission is needed\n to execute the "
797 "diff ioctl"));
798 } else if (errno == EXDEV) {
799 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
800 "\n Not an earlier snapshot from the same fs"));
801 } else if (errno != EPIPE || di.zerr == 0) {
802 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
803 }
804 (void) close(pipefd[1]);
805 (void) pthread_cancel(tid);
806 (void) pthread_join(tid, NULL);
807 teardown_differ_info(&di);
808 if (di.zerr != 0 && di.zerr != EPIPE) {
809 zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr));
810 return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf));
811 } else {
812 return (zfs_error(zhp->zfs_hdl, EZFS_DIFFDATA, errbuf));
813 }
814 }
815
816 (void) close(pipefd[1]);
817 (void) pthread_join(tid, NULL);
818
819 if (di.zerr != 0) {
820 zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr));
821 return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf));
822 }
823 teardown_differ_info(&di);
824 return (0);
825 }
unleashed repo fork