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572e2857 BB |
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 | */ | |
25 | ||
26 | /* | |
27 | * zfs diff support | |
28 | */ | |
29 | #include <ctype.h> | |
30 | #include <errno.h> | |
31 | #include <libintl.h> | |
32 | #include <string.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/stat.h> | |
35 | #include <fcntl.h> | |
36 | #include <attr.h> | |
37 | #include <stddef.h> | |
38 | #include <unistd.h> | |
39 | #include <stdio.h> | |
40 | #include <stdlib.h> | |
41 | #include <stropts.h> | |
42 | #include <pthread.h> | |
43 | #include <sys/zfs_ioctl.h> | |
44 | #include <libzfs.h> | |
45 | #include "libzfs_impl.h" | |
46 | ||
47 | #define ZDIFF_SNAPDIR "/.zfs/snapshot/" | |
48 | #define ZDIFF_SHARESDIR "/.zfs/shares/" | |
49 | #define ZDIFF_PREFIX "zfs-diff-%d" | |
50 | ||
51 | #define ZDIFF_ADDED '+' | |
52 | #define ZDIFF_MODIFIED 'M' | |
53 | #define ZDIFF_REMOVED '-' | |
54 | #define ZDIFF_RENAMED 'R' | |
55 | ||
56 | static boolean_t | |
57 | do_name_cmp(const char *fpath, const char *tpath) | |
58 | { | |
59 | char *fname, *tname; | |
60 | fname = strrchr(fpath, '/') + 1; | |
61 | tname = strrchr(tpath, '/') + 1; | |
62 | return (strcmp(fname, tname) == 0); | |
63 | } | |
64 | ||
65 | typedef struct differ_info { | |
66 | zfs_handle_t *zhp; | |
67 | char *fromsnap; | |
68 | char *frommnt; | |
69 | char *tosnap; | |
70 | char *tomnt; | |
71 | char *ds; | |
72 | char *dsmnt; | |
73 | char *tmpsnap; | |
74 | char errbuf[1024]; | |
75 | boolean_t isclone; | |
76 | boolean_t scripted; | |
77 | boolean_t classify; | |
78 | boolean_t timestamped; | |
79 | uint64_t shares; | |
80 | int zerr; | |
81 | int cleanupfd; | |
82 | int outputfd; | |
83 | int datafd; | |
84 | } differ_info_t; | |
85 | ||
86 | /* | |
87 | * Given a {dsname, object id}, get the object path | |
88 | */ | |
89 | static int | |
90 | get_stats_for_obj(differ_info_t *di, const char *dsname, uint64_t obj, | |
91 | char *pn, int maxlen, zfs_stat_t *sb) | |
92 | { | |
93 | zfs_cmd_t zc = { 0 }; | |
94 | int error; | |
95 | ||
96 | (void) strlcpy(zc.zc_name, dsname, sizeof (zc.zc_name)); | |
97 | zc.zc_obj = obj; | |
98 | ||
99 | errno = 0; | |
100 | error = ioctl(di->zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJ_TO_STATS, &zc); | |
101 | di->zerr = errno; | |
102 | ||
103 | /* we can get stats even if we failed to get a path */ | |
104 | (void) memcpy(sb, &zc.zc_stat, sizeof (zfs_stat_t)); | |
105 | if (error == 0) { | |
106 | ASSERT(di->zerr == 0); | |
107 | (void) strlcpy(pn, zc.zc_value, maxlen); | |
108 | return (0); | |
109 | } | |
110 | ||
111 | if (di->zerr == EPERM) { | |
112 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
113 | dgettext(TEXT_DOMAIN, | |
114 | "The sys_config privilege or diff delegated permission " | |
115 | "is needed\nto discover path names")); | |
116 | return (-1); | |
117 | } else { | |
118 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
119 | dgettext(TEXT_DOMAIN, | |
120 | "Unable to determine path or stats for " | |
b8864a23 | 121 | "object %lld in %s"), (longlong_t)obj, dsname); |
572e2857 BB |
122 | return (-1); |
123 | } | |
124 | } | |
125 | ||
126 | /* | |
127 | * stream_bytes | |
128 | * | |
129 | * Prints a file name out a character at a time. If the character is | |
130 | * not in the range of what we consider "printable" ASCII, display it | |
131 | * as an escaped 3-digit octal value. ASCII values less than a space | |
132 | * are all control characters and we declare the upper end as the | |
133 | * DELete character. This also is the last 7-bit ASCII character. | |
134 | * We choose to treat all 8-bit ASCII as not printable for this | |
135 | * application. | |
136 | */ | |
137 | static void | |
138 | stream_bytes(FILE *fp, const char *string) | |
139 | { | |
140 | while (*string) { | |
141 | if (*string > ' ' && *string != '\\' && *string < '\177') | |
142 | (void) fprintf(fp, "%c", *string++); | |
143 | else | |
144 | (void) fprintf(fp, "\\%03o", *string++); | |
145 | } | |
146 | } | |
147 | ||
148 | static void | |
149 | print_what(FILE *fp, mode_t what) | |
150 | { | |
151 | char symbol; | |
152 | ||
153 | switch (what & S_IFMT) { | |
154 | case S_IFBLK: | |
155 | symbol = 'B'; | |
156 | break; | |
157 | case S_IFCHR: | |
158 | symbol = 'C'; | |
159 | break; | |
160 | case S_IFDIR: | |
161 | symbol = '/'; | |
162 | break; | |
163 | case S_IFDOOR: | |
164 | symbol = '>'; | |
165 | break; | |
166 | case S_IFIFO: | |
167 | symbol = '|'; | |
168 | break; | |
169 | case S_IFLNK: | |
170 | symbol = '@'; | |
171 | break; | |
172 | case S_IFPORT: | |
173 | symbol = 'P'; | |
174 | break; | |
175 | case S_IFSOCK: | |
176 | symbol = '='; | |
177 | break; | |
178 | case S_IFREG: | |
179 | symbol = 'F'; | |
180 | break; | |
181 | default: | |
182 | symbol = '?'; | |
183 | break; | |
184 | } | |
185 | (void) fprintf(fp, "%c", symbol); | |
186 | } | |
187 | ||
188 | static void | |
189 | print_cmn(FILE *fp, differ_info_t *di, const char *file) | |
190 | { | |
191 | stream_bytes(fp, di->dsmnt); | |
192 | stream_bytes(fp, file); | |
193 | } | |
194 | ||
195 | static void | |
196 | print_rename(FILE *fp, differ_info_t *di, const char *old, const char *new, | |
197 | zfs_stat_t *isb) | |
198 | { | |
199 | if (di->timestamped) | |
200 | (void) fprintf(fp, "%10lld.%09lld\t", | |
201 | (longlong_t)isb->zs_ctime[0], | |
202 | (longlong_t)isb->zs_ctime[1]); | |
203 | (void) fprintf(fp, "%c\t", ZDIFF_RENAMED); | |
204 | if (di->classify) { | |
205 | print_what(fp, isb->zs_mode); | |
206 | (void) fprintf(fp, "\t"); | |
207 | } | |
208 | print_cmn(fp, di, old); | |
209 | if (di->scripted) | |
210 | (void) fprintf(fp, "\t"); | |
211 | else | |
212 | (void) fprintf(fp, " -> "); | |
213 | print_cmn(fp, di, new); | |
214 | (void) fprintf(fp, "\n"); | |
215 | } | |
216 | ||
217 | static void | |
218 | print_link_change(FILE *fp, differ_info_t *di, int delta, const char *file, | |
219 | zfs_stat_t *isb) | |
220 | { | |
221 | if (di->timestamped) | |
222 | (void) fprintf(fp, "%10lld.%09lld\t", | |
223 | (longlong_t)isb->zs_ctime[0], | |
224 | (longlong_t)isb->zs_ctime[1]); | |
225 | (void) fprintf(fp, "%c\t", ZDIFF_MODIFIED); | |
226 | if (di->classify) { | |
227 | print_what(fp, isb->zs_mode); | |
228 | (void) fprintf(fp, "\t"); | |
229 | } | |
230 | print_cmn(fp, di, file); | |
231 | (void) fprintf(fp, "\t(%+d)", delta); | |
232 | (void) fprintf(fp, "\n"); | |
233 | } | |
234 | ||
235 | static void | |
236 | print_file(FILE *fp, differ_info_t *di, char type, const char *file, | |
237 | zfs_stat_t *isb) | |
238 | { | |
239 | if (di->timestamped) | |
240 | (void) fprintf(fp, "%10lld.%09lld\t", | |
241 | (longlong_t)isb->zs_ctime[0], | |
242 | (longlong_t)isb->zs_ctime[1]); | |
243 | (void) fprintf(fp, "%c\t", type); | |
244 | if (di->classify) { | |
245 | print_what(fp, isb->zs_mode); | |
246 | (void) fprintf(fp, "\t"); | |
247 | } | |
248 | print_cmn(fp, di, file); | |
249 | (void) fprintf(fp, "\n"); | |
250 | } | |
251 | ||
252 | static int | |
253 | write_inuse_diffs_one(FILE *fp, differ_info_t *di, uint64_t dobj) | |
254 | { | |
255 | struct zfs_stat fsb, tsb; | |
256 | boolean_t same_name; | |
257 | mode_t fmode, tmode; | |
258 | char fobjname[MAXPATHLEN], tobjname[MAXPATHLEN]; | |
259 | int fobjerr, tobjerr; | |
260 | int change; | |
261 | ||
262 | if (dobj == di->shares) | |
263 | return (0); | |
264 | ||
265 | /* | |
266 | * Check the from and to snapshots for info on the object. If | |
267 | * we get ENOENT, then the object just didn't exist in that | |
268 | * snapshot. If we get ENOTSUP, then we tried to get | |
269 | * info on a non-ZPL object, which we don't care about anyway. | |
270 | */ | |
271 | fobjerr = get_stats_for_obj(di, di->fromsnap, dobj, fobjname, | |
272 | MAXPATHLEN, &fsb); | |
273 | if (fobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP) | |
274 | return (-1); | |
275 | ||
276 | tobjerr = get_stats_for_obj(di, di->tosnap, dobj, tobjname, | |
277 | MAXPATHLEN, &tsb); | |
278 | if (tobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP) | |
279 | return (-1); | |
280 | ||
281 | /* | |
282 | * Unallocated object sharing the same meta dnode block | |
283 | */ | |
284 | if (fobjerr && tobjerr) { | |
285 | ASSERT(di->zerr == ENOENT || di->zerr == ENOTSUP); | |
286 | di->zerr = 0; | |
287 | return (0); | |
288 | } | |
289 | ||
290 | di->zerr = 0; /* negate get_stats_for_obj() from side that failed */ | |
291 | fmode = fsb.zs_mode & S_IFMT; | |
292 | tmode = tsb.zs_mode & S_IFMT; | |
293 | if (fmode == S_IFDIR || tmode == S_IFDIR || fsb.zs_links == 0 || | |
294 | tsb.zs_links == 0) | |
295 | change = 0; | |
296 | else | |
297 | change = tsb.zs_links - fsb.zs_links; | |
298 | ||
299 | if (fobjerr) { | |
300 | if (change) { | |
301 | print_link_change(fp, di, change, tobjname, &tsb); | |
302 | return (0); | |
303 | } | |
304 | print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb); | |
305 | return (0); | |
306 | } else if (tobjerr) { | |
307 | if (change) { | |
308 | print_link_change(fp, di, change, fobjname, &fsb); | |
309 | return (0); | |
310 | } | |
311 | print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb); | |
312 | return (0); | |
313 | } | |
314 | ||
315 | if (fmode != tmode && fsb.zs_gen == tsb.zs_gen) | |
316 | tsb.zs_gen++; /* Force a generational difference */ | |
317 | same_name = do_name_cmp(fobjname, tobjname); | |
318 | ||
319 | /* Simple modification or no change */ | |
320 | if (fsb.zs_gen == tsb.zs_gen) { | |
321 | /* No apparent changes. Could we assert !this? */ | |
322 | if (fsb.zs_ctime[0] == tsb.zs_ctime[0] && | |
323 | fsb.zs_ctime[1] == tsb.zs_ctime[1]) | |
324 | return (0); | |
325 | if (change) { | |
326 | print_link_change(fp, di, change, | |
327 | change > 0 ? fobjname : tobjname, &tsb); | |
328 | } else if (same_name) { | |
329 | print_file(fp, di, ZDIFF_MODIFIED, fobjname, &tsb); | |
330 | } else { | |
331 | print_rename(fp, di, fobjname, tobjname, &tsb); | |
332 | } | |
333 | return (0); | |
334 | } else { | |
335 | /* file re-created or object re-used */ | |
336 | print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb); | |
337 | print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb); | |
338 | return (0); | |
339 | } | |
340 | } | |
341 | ||
342 | static int | |
343 | write_inuse_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr) | |
344 | { | |
345 | uint64_t o; | |
346 | int err; | |
347 | ||
348 | for (o = dr->ddr_first; o <= dr->ddr_last; o++) { | |
349 | if (err = write_inuse_diffs_one(fp, di, o)) | |
350 | return (err); | |
351 | } | |
352 | return (0); | |
353 | } | |
354 | ||
355 | static int | |
356 | describe_free(FILE *fp, differ_info_t *di, uint64_t object, char *namebuf, | |
357 | int maxlen) | |
358 | { | |
359 | struct zfs_stat sb; | |
360 | ||
361 | if (get_stats_for_obj(di, di->fromsnap, object, namebuf, | |
362 | maxlen, &sb) != 0) { | |
363 | /* Let it slide, if in the delete queue on from side */ | |
364 | if (di->zerr == ENOENT && sb.zs_links == 0) { | |
365 | di->zerr = 0; | |
366 | return (0); | |
367 | } | |
368 | return (-1); | |
369 | } | |
370 | ||
371 | print_file(fp, di, ZDIFF_REMOVED, namebuf, &sb); | |
372 | return (0); | |
373 | } | |
374 | ||
375 | static int | |
376 | write_free_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr) | |
377 | { | |
378 | zfs_cmd_t zc = { 0 }; | |
379 | libzfs_handle_t *lhdl = di->zhp->zfs_hdl; | |
380 | char fobjname[MAXPATHLEN]; | |
381 | ||
382 | (void) strlcpy(zc.zc_name, di->fromsnap, sizeof (zc.zc_name)); | |
383 | zc.zc_obj = dr->ddr_first - 1; | |
384 | ||
385 | ASSERT(di->zerr == 0); | |
386 | ||
387 | while (zc.zc_obj < dr->ddr_last) { | |
388 | int err; | |
389 | ||
390 | err = ioctl(lhdl->libzfs_fd, ZFS_IOC_NEXT_OBJ, &zc); | |
391 | if (err == 0) { | |
392 | if (zc.zc_obj == di->shares) { | |
393 | zc.zc_obj++; | |
394 | continue; | |
395 | } | |
396 | if (zc.zc_obj > dr->ddr_last) { | |
397 | break; | |
398 | } | |
399 | err = describe_free(fp, di, zc.zc_obj, fobjname, | |
400 | MAXPATHLEN); | |
401 | if (err) | |
402 | break; | |
403 | } else if (errno == ESRCH) { | |
404 | break; | |
405 | } else { | |
406 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
407 | dgettext(TEXT_DOMAIN, | |
408 | "next allocated object (> %lld) find failure"), | |
b8864a23 | 409 | (longlong_t)zc.zc_obj); |
572e2857 BB |
410 | di->zerr = errno; |
411 | break; | |
412 | } | |
413 | } | |
414 | if (di->zerr) | |
415 | return (-1); | |
416 | return (0); | |
417 | } | |
418 | ||
419 | static void * | |
420 | differ(void *arg) | |
421 | { | |
422 | differ_info_t *di = arg; | |
423 | dmu_diff_record_t dr; | |
424 | FILE *ofp; | |
425 | int err = 0; | |
426 | ||
427 | if ((ofp = fdopen(di->outputfd, "w")) == NULL) { | |
428 | di->zerr = errno; | |
429 | (void) strerror_r(errno, di->errbuf, sizeof (di->errbuf)); | |
430 | (void) close(di->datafd); | |
431 | return ((void *)-1); | |
432 | } | |
433 | ||
434 | for (;;) { | |
435 | char *cp = (char *)&dr; | |
436 | int len = sizeof (dr); | |
437 | int rv; | |
438 | ||
439 | do { | |
440 | rv = read(di->datafd, cp, len); | |
441 | cp += rv; | |
442 | len -= rv; | |
443 | } while (len > 0 && rv > 0); | |
444 | ||
445 | if (rv < 0 || (rv == 0 && len != sizeof (dr))) { | |
446 | di->zerr = EPIPE; | |
447 | break; | |
448 | } else if (rv == 0) { | |
449 | /* end of file at a natural breaking point */ | |
450 | break; | |
451 | } | |
452 | ||
453 | switch (dr.ddr_type) { | |
454 | case DDR_FREE: | |
455 | err = write_free_diffs(ofp, di, &dr); | |
456 | break; | |
457 | case DDR_INUSE: | |
458 | err = write_inuse_diffs(ofp, di, &dr); | |
459 | break; | |
460 | default: | |
461 | di->zerr = EPIPE; | |
462 | break; | |
463 | } | |
464 | ||
465 | if (err || di->zerr) | |
466 | break; | |
467 | } | |
468 | ||
469 | (void) fclose(ofp); | |
470 | (void) close(di->datafd); | |
471 | if (err) | |
472 | return ((void *)-1); | |
473 | if (di->zerr) { | |
474 | ASSERT(di->zerr == EINVAL); | |
475 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
476 | dgettext(TEXT_DOMAIN, | |
477 | "Internal error: bad data from diff IOCTL")); | |
478 | return ((void *)-1); | |
479 | } | |
480 | return ((void *)0); | |
481 | } | |
482 | ||
483 | static int | |
484 | find_shares_object(differ_info_t *di) | |
485 | { | |
486 | char fullpath[MAXPATHLEN]; | |
487 | struct stat64 sb = { 0 }; | |
488 | ||
489 | (void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN); | |
490 | (void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN); | |
491 | ||
492 | if (stat64(fullpath, &sb) != 0) { | |
493 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
494 | dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath); | |
495 | return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf)); | |
496 | } | |
497 | ||
498 | di->shares = (uint64_t)sb.st_ino; | |
499 | return (0); | |
500 | } | |
501 | ||
502 | static int | |
503 | make_temp_snapshot(differ_info_t *di) | |
504 | { | |
505 | libzfs_handle_t *hdl = di->zhp->zfs_hdl; | |
506 | zfs_cmd_t zc = { 0 }; | |
507 | ||
508 | (void) snprintf(zc.zc_value, sizeof (zc.zc_value), | |
509 | ZDIFF_PREFIX, getpid()); | |
510 | (void) strlcpy(zc.zc_name, di->ds, sizeof (zc.zc_name)); | |
511 | zc.zc_cleanup_fd = di->cleanupfd; | |
512 | ||
513 | if (ioctl(hdl->libzfs_fd, ZFS_IOC_TMP_SNAPSHOT, &zc) != 0) { | |
514 | int err = errno; | |
515 | if (err == EPERM) { | |
516 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
517 | dgettext(TEXT_DOMAIN, "The diff delegated " | |
518 | "permission is needed in order\nto create a " | |
519 | "just-in-time snapshot for diffing\n")); | |
520 | return (zfs_error(hdl, EZFS_DIFF, di->errbuf)); | |
521 | } else { | |
522 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
523 | dgettext(TEXT_DOMAIN, "Cannot create just-in-time " | |
524 | "snapshot of '%s'"), zc.zc_name); | |
525 | return (zfs_standard_error(hdl, err, di->errbuf)); | |
526 | } | |
527 | } | |
528 | ||
529 | di->tmpsnap = zfs_strdup(hdl, zc.zc_value); | |
530 | di->tosnap = zfs_asprintf(hdl, "%s@%s", di->ds, di->tmpsnap); | |
531 | return (0); | |
532 | } | |
533 | ||
534 | static void | |
535 | teardown_differ_info(differ_info_t *di) | |
536 | { | |
537 | free(di->ds); | |
538 | free(di->dsmnt); | |
539 | free(di->fromsnap); | |
540 | free(di->frommnt); | |
541 | free(di->tosnap); | |
542 | free(di->tmpsnap); | |
543 | free(di->tomnt); | |
544 | (void) close(di->cleanupfd); | |
545 | } | |
546 | ||
547 | static int | |
548 | get_snapshot_names(differ_info_t *di, const char *fromsnap, | |
549 | const char *tosnap) | |
550 | { | |
551 | libzfs_handle_t *hdl = di->zhp->zfs_hdl; | |
552 | char *atptrf = NULL; | |
553 | char *atptrt = NULL; | |
554 | int fdslen, fsnlen; | |
555 | int tdslen, tsnlen; | |
556 | ||
557 | /* | |
558 | * Can accept | |
559 | * dataset@snap1 | |
560 | * dataset@snap1 dataset@snap2 | |
561 | * dataset@snap1 @snap2 | |
562 | * dataset@snap1 dataset | |
563 | * @snap1 dataset@snap2 | |
564 | */ | |
565 | if (tosnap == NULL) { | |
566 | /* only a from snapshot given, must be valid */ | |
567 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
568 | dgettext(TEXT_DOMAIN, | |
569 | "Badly formed snapshot name %s"), fromsnap); | |
570 | ||
571 | if (!zfs_validate_name(hdl, fromsnap, ZFS_TYPE_SNAPSHOT, | |
572 | B_FALSE)) { | |
573 | return (zfs_error(hdl, EZFS_INVALIDNAME, | |
574 | di->errbuf)); | |
575 | } | |
576 | ||
577 | atptrf = strchr(fromsnap, '@'); | |
578 | ASSERT(atptrf != NULL); | |
579 | fdslen = atptrf - fromsnap; | |
580 | ||
581 | di->fromsnap = zfs_strdup(hdl, fromsnap); | |
582 | di->ds = zfs_strdup(hdl, fromsnap); | |
583 | di->ds[fdslen] = '\0'; | |
584 | ||
585 | /* the to snap will be a just-in-time snap of the head */ | |
586 | return (make_temp_snapshot(di)); | |
587 | } | |
588 | ||
589 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
590 | dgettext(TEXT_DOMAIN, | |
591 | "Unable to determine which snapshots to compare")); | |
592 | ||
593 | atptrf = strchr(fromsnap, '@'); | |
594 | atptrt = strchr(tosnap, '@'); | |
595 | fdslen = atptrf ? atptrf - fromsnap : strlen(fromsnap); | |
596 | tdslen = atptrt ? atptrt - tosnap : strlen(tosnap); | |
597 | fsnlen = strlen(fromsnap) - fdslen; /* includes @ sign */ | |
598 | tsnlen = strlen(tosnap) - tdslen; /* includes @ sign */ | |
599 | ||
600 | if (fsnlen <= 1 || tsnlen == 1 || (fdslen == 0 && tdslen == 0) || | |
601 | (fsnlen == 0 && tsnlen == 0)) { | |
602 | return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf)); | |
603 | } else if ((fdslen > 0 && tdslen > 0) && | |
604 | ((tdslen != fdslen || strncmp(fromsnap, tosnap, fdslen) != 0))) { | |
605 | /* | |
606 | * not the same dataset name, might be okay if | |
607 | * tosnap is a clone of a fromsnap descendant. | |
608 | */ | |
609 | char origin[ZFS_MAXNAMELEN]; | |
610 | zprop_source_t src; | |
611 | zfs_handle_t *zhp; | |
612 | ||
613 | di->ds = zfs_alloc(di->zhp->zfs_hdl, tdslen + 1); | |
614 | (void) strncpy(di->ds, tosnap, tdslen); | |
615 | di->ds[tdslen] = '\0'; | |
616 | ||
617 | zhp = zfs_open(hdl, di->ds, ZFS_TYPE_FILESYSTEM); | |
618 | while (zhp != NULL) { | |
619 | (void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN, | |
620 | origin, sizeof (origin), &src, NULL, 0, B_FALSE); | |
621 | ||
622 | if (strncmp(origin, fromsnap, fsnlen) == 0) | |
623 | break; | |
624 | ||
625 | (void) zfs_close(zhp); | |
626 | zhp = zfs_open(hdl, origin, ZFS_TYPE_FILESYSTEM); | |
627 | } | |
628 | ||
629 | if (zhp == NULL) { | |
630 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
631 | dgettext(TEXT_DOMAIN, | |
632 | "Not an earlier snapshot from the same fs")); | |
633 | return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf)); | |
634 | } else { | |
635 | (void) zfs_close(zhp); | |
636 | } | |
637 | ||
638 | di->isclone = B_TRUE; | |
639 | di->fromsnap = zfs_strdup(hdl, fromsnap); | |
640 | if (tsnlen) { | |
641 | di->tosnap = zfs_strdup(hdl, tosnap); | |
642 | } else { | |
643 | return (make_temp_snapshot(di)); | |
644 | } | |
645 | } else { | |
646 | int dslen = fdslen ? fdslen : tdslen; | |
647 | ||
648 | di->ds = zfs_alloc(hdl, dslen + 1); | |
649 | (void) strncpy(di->ds, fdslen ? fromsnap : tosnap, dslen); | |
650 | di->ds[dslen] = '\0'; | |
651 | ||
652 | di->fromsnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrf); | |
653 | if (tsnlen) { | |
654 | di->tosnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrt); | |
655 | } else { | |
656 | return (make_temp_snapshot(di)); | |
657 | } | |
658 | } | |
659 | return (0); | |
660 | } | |
661 | ||
662 | static int | |
663 | get_mountpoint(differ_info_t *di, char *dsnm, char **mntpt) | |
664 | { | |
665 | boolean_t mounted; | |
666 | ||
667 | mounted = is_mounted(di->zhp->zfs_hdl, dsnm, mntpt); | |
668 | if (mounted == B_FALSE) { | |
669 | (void) snprintf(di->errbuf, sizeof (di->errbuf), | |
670 | dgettext(TEXT_DOMAIN, | |
671 | "Cannot diff an unmounted snapshot")); | |
672 | return (zfs_error(di->zhp->zfs_hdl, EZFS_BADTYPE, di->errbuf)); | |
673 | } | |
674 | ||
675 | /* Avoid a double slash at the beginning of root-mounted datasets */ | |
676 | if (**mntpt == '/' && *(*mntpt + 1) == '\0') | |
677 | **mntpt = '\0'; | |
678 | return (0); | |
679 | } | |
680 | ||
681 | static int | |
682 | get_mountpoints(differ_info_t *di) | |
683 | { | |
684 | char *strptr; | |
685 | char *frommntpt; | |
686 | ||
687 | /* | |
688 | * first get the mountpoint for the parent dataset | |
689 | */ | |
690 | if (get_mountpoint(di, di->ds, &di->dsmnt) != 0) | |
691 | return (-1); | |
692 | ||
693 | strptr = strchr(di->tosnap, '@'); | |
694 | ASSERT3P(strptr, !=, NULL); | |
695 | di->tomnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", di->dsmnt, | |
696 | ZDIFF_SNAPDIR, ++strptr); | |
697 | ||
698 | strptr = strchr(di->fromsnap, '@'); | |
699 | ASSERT3P(strptr, !=, NULL); | |
700 | ||
701 | frommntpt = di->dsmnt; | |
702 | if (di->isclone) { | |
703 | char *mntpt; | |
704 | int err; | |
705 | ||
706 | *strptr = '\0'; | |
707 | err = get_mountpoint(di, di->fromsnap, &mntpt); | |
708 | *strptr = '@'; | |
709 | if (err != 0) | |
710 | return (-1); | |
711 | frommntpt = mntpt; | |
712 | } | |
713 | ||
714 | di->frommnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", frommntpt, | |
715 | ZDIFF_SNAPDIR, ++strptr); | |
716 | ||
717 | if (di->isclone) | |
718 | free(frommntpt); | |
719 | ||
720 | return (0); | |
721 | } | |
722 | ||
723 | static int | |
724 | setup_differ_info(zfs_handle_t *zhp, const char *fromsnap, | |
725 | const char *tosnap, differ_info_t *di) | |
726 | { | |
727 | di->zhp = zhp; | |
728 | ||
729 | di->cleanupfd = open(ZFS_DEV, O_RDWR|O_EXCL); | |
730 | VERIFY(di->cleanupfd >= 0); | |
731 | ||
732 | if (get_snapshot_names(di, fromsnap, tosnap) != 0) | |
733 | return (-1); | |
734 | ||
735 | if (get_mountpoints(di) != 0) | |
736 | return (-1); | |
737 | ||
738 | if (find_shares_object(di) != 0) | |
739 | return (-1); | |
740 | ||
741 | return (0); | |
742 | } | |
743 | ||
744 | int | |
745 | zfs_show_diffs(zfs_handle_t *zhp, int outfd, const char *fromsnap, | |
746 | const char *tosnap, int flags) | |
747 | { | |
748 | zfs_cmd_t zc = { 0 }; | |
749 | char errbuf[1024]; | |
750 | differ_info_t di = { 0 }; | |
751 | pthread_t tid; | |
752 | int pipefd[2]; | |
753 | int iocerr; | |
754 | ||
755 | (void) snprintf(errbuf, sizeof (errbuf), | |
756 | dgettext(TEXT_DOMAIN, "zfs diff failed")); | |
757 | ||
758 | if (setup_differ_info(zhp, fromsnap, tosnap, &di)) { | |
759 | teardown_differ_info(&di); | |
760 | return (-1); | |
761 | } | |
762 | ||
763 | if (pipe(pipefd)) { | |
764 | zfs_error_aux(zhp->zfs_hdl, strerror(errno)); | |
765 | teardown_differ_info(&di); | |
766 | return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, errbuf)); | |
767 | } | |
768 | ||
769 | di.scripted = (flags & ZFS_DIFF_PARSEABLE); | |
770 | di.classify = (flags & ZFS_DIFF_CLASSIFY); | |
771 | di.timestamped = (flags & ZFS_DIFF_TIMESTAMP); | |
772 | ||
773 | di.outputfd = outfd; | |
774 | di.datafd = pipefd[0]; | |
775 | ||
776 | if (pthread_create(&tid, NULL, differ, &di)) { | |
777 | zfs_error_aux(zhp->zfs_hdl, strerror(errno)); | |
778 | (void) close(pipefd[0]); | |
779 | (void) close(pipefd[1]); | |
780 | teardown_differ_info(&di); | |
781 | return (zfs_error(zhp->zfs_hdl, | |
782 | EZFS_THREADCREATEFAILED, errbuf)); | |
783 | } | |
784 | ||
785 | /* do the ioctl() */ | |
786 | (void) strlcpy(zc.zc_value, di.fromsnap, strlen(di.fromsnap) + 1); | |
787 | (void) strlcpy(zc.zc_name, di.tosnap, strlen(di.tosnap) + 1); | |
788 | zc.zc_cookie = pipefd[1]; | |
789 | ||
790 | iocerr = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DIFF, &zc); | |
791 | if (iocerr != 0) { | |
792 | (void) snprintf(errbuf, sizeof (errbuf), | |
793 | dgettext(TEXT_DOMAIN, "Unable to obtain diffs")); | |
794 | if (errno == EPERM) { | |
795 | zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN, | |
796 | "\n The sys_mount privilege or diff delegated " | |
797 | "permission is needed\n to execute the " | |
798 | "diff ioctl")); | |
799 | } else if (errno == EXDEV) { | |
800 | zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN, | |
801 | "\n Not an earlier snapshot from the same fs")); | |
802 | } else if (errno != EPIPE || di.zerr == 0) { | |
803 | zfs_error_aux(zhp->zfs_hdl, strerror(errno)); | |
804 | } | |
805 | (void) close(pipefd[1]); | |
806 | (void) pthread_cancel(tid); | |
807 | (void) pthread_join(tid, NULL); | |
808 | teardown_differ_info(&di); | |
809 | if (di.zerr != 0 && di.zerr != EPIPE) { | |
810 | zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr)); | |
811 | return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf)); | |
812 | } else { | |
813 | return (zfs_error(zhp->zfs_hdl, EZFS_DIFFDATA, errbuf)); | |
814 | } | |
815 | } | |
816 | ||
817 | (void) close(pipefd[1]); | |
818 | (void) pthread_join(tid, NULL); | |
819 | ||
820 | if (di.zerr != 0) { | |
821 | zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr)); | |
822 | return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf)); | |
823 | } | |
824 | teardown_differ_info(&di); | |
825 | return (0); | |
826 | } |