1 /*-
2 * Copyright (c) 2007 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 /*
31 * Stand-alone ZFS file reader.
32 */
33
34 #include <sys/stat.h>
35 #include <sys/stdint.h>
36
37 #include "zfsimpl.h"
38 #include "zfssubr.c"
39
40
41 struct zfsmount {
42 const spa_t *spa;
43 objset_phys_t objset;
44 uint64_t rootobj;
45 };
46
47 /*
48 * List of all vdevs, chained through v_alllink.
49 */
50 static vdev_list_t zfs_vdevs;
51
52 /*
53 * List of ZFS features supported for read
54 */
55 static const char *features_for_read[] = {
56 "org.illumos:lz4_compress",
57 "com.delphix:hole_birth",
58 "com.delphix:extensible_dataset",
59 "com.delphix:embedded_data",
60 "org.open-zfs:large_blocks",
61 NULL
62 };
63
64 /*
65 * List of all pools, chained through spa_link.
66 */
67 static spa_list_t zfs_pools;
68
69 static uint64_t zfs_crc64_table[256];
70 static const dnode_phys_t *dnode_cache_obj = 0;
71 static uint64_t dnode_cache_bn;
72 static char *dnode_cache_buf;
73 static char *zap_scratch;
74 static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr;
75
76 #define TEMP_SIZE (1024 * 1024)
77
78 static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf);
79 static int zfs_get_root(const spa_t *spa, uint64_t *objid);
80 static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result);
81
82 static void
zfs_init(void)83 zfs_init(void)
84 {
85 STAILQ_INIT(&zfs_vdevs);
86 STAILQ_INIT(&zfs_pools);
87
88 zfs_temp_buf = malloc(TEMP_SIZE);
89 zfs_temp_end = zfs_temp_buf + TEMP_SIZE;
90 zfs_temp_ptr = zfs_temp_buf;
91 dnode_cache_buf = malloc(SPA_MAXBLOCKSIZE);
92 zap_scratch = malloc(SPA_MAXBLOCKSIZE);
93
94 zfs_init_crc();
95 }
96
97 static void *
zfs_alloc(size_t size)98 zfs_alloc(size_t size)
99 {
100 char *ptr;
101
102 if (zfs_temp_ptr + size > zfs_temp_end) {
103 printf("ZFS: out of temporary buffer space\n");
104 for (;;) ;
105 }
106 ptr = zfs_temp_ptr;
107 zfs_temp_ptr += size;
108
109 return (ptr);
110 }
111
112 static void
zfs_free(void * ptr,size_t size)113 zfs_free(void *ptr, size_t size)
114 {
115
116 zfs_temp_ptr -= size;
117 if (zfs_temp_ptr != ptr) {
118 printf("ZFS: zfs_alloc()/zfs_free() mismatch\n");
119 for (;;) ;
120 }
121 }
122
123 static int
xdr_int(const unsigned char ** xdr,int * ip)124 xdr_int(const unsigned char **xdr, int *ip)
125 {
126 *ip = ((*xdr)[0] << 24)
127 | ((*xdr)[1] << 16)
128 | ((*xdr)[2] << 8)
129 | ((*xdr)[3] << 0);
130 (*xdr) += 4;
131 return (0);
132 }
133
134 static int
xdr_u_int(const unsigned char ** xdr,u_int * ip)135 xdr_u_int(const unsigned char **xdr, u_int *ip)
136 {
137 *ip = ((*xdr)[0] << 24)
138 | ((*xdr)[1] << 16)
139 | ((*xdr)[2] << 8)
140 | ((*xdr)[3] << 0);
141 (*xdr) += 4;
142 return (0);
143 }
144
145 static int
xdr_uint64_t(const unsigned char ** xdr,uint64_t * lp)146 xdr_uint64_t(const unsigned char **xdr, uint64_t *lp)
147 {
148 u_int hi, lo;
149
150 xdr_u_int(xdr, &hi);
151 xdr_u_int(xdr, &lo);
152 *lp = (((uint64_t) hi) << 32) | lo;
153 return (0);
154 }
155
156 static int
nvlist_find(const unsigned char * nvlist,const char * name,int type,int * elementsp,void * valuep)157 nvlist_find(const unsigned char *nvlist, const char *name, int type,
158 int* elementsp, void *valuep)
159 {
160 const unsigned char *p, *pair;
161 int junk;
162 int encoded_size, decoded_size;
163
164 p = nvlist;
165 xdr_int(&p, &junk);
166 xdr_int(&p, &junk);
167
168 pair = p;
169 xdr_int(&p, &encoded_size);
170 xdr_int(&p, &decoded_size);
171 while (encoded_size && decoded_size) {
172 int namelen, pairtype, elements;
173 const char *pairname;
174
175 xdr_int(&p, &namelen);
176 pairname = (const char*) p;
177 p += roundup(namelen, 4);
178 xdr_int(&p, &pairtype);
179
180 if (!memcmp(name, pairname, namelen) && type == pairtype) {
181 xdr_int(&p, &elements);
182 if (elementsp)
183 *elementsp = elements;
184 if (type == DATA_TYPE_UINT64) {
185 xdr_uint64_t(&p, (uint64_t *) valuep);
186 return (0);
187 } else if (type == DATA_TYPE_STRING) {
188 int len;
189 xdr_int(&p, &len);
190 (*(const char**) valuep) = (const char*) p;
191 return (0);
192 } else if (type == DATA_TYPE_NVLIST
193 || type == DATA_TYPE_NVLIST_ARRAY) {
194 (*(const unsigned char**) valuep) =
195 (const unsigned char*) p;
196 return (0);
197 } else {
198 return (EIO);
199 }
200 } else {
201 /*
202 * Not the pair we are looking for, skip to the next one.
203 */
204 p = pair + encoded_size;
205 }
206
207 pair = p;
208 xdr_int(&p, &encoded_size);
209 xdr_int(&p, &decoded_size);
210 }
211
212 return (EIO);
213 }
214
215 static int
nvlist_check_features_for_read(const unsigned char * nvlist)216 nvlist_check_features_for_read(const unsigned char *nvlist)
217 {
218 const unsigned char *p, *pair;
219 int junk;
220 int encoded_size, decoded_size;
221 int rc;
222
223 rc = 0;
224
225 p = nvlist;
226 xdr_int(&p, &junk);
227 xdr_int(&p, &junk);
228
229 pair = p;
230 xdr_int(&p, &encoded_size);
231 xdr_int(&p, &decoded_size);
232 while (encoded_size && decoded_size) {
233 int namelen, pairtype;
234 const char *pairname;
235 int i, found;
236
237 found = 0;
238
239 xdr_int(&p, &namelen);
240 pairname = (const char*) p;
241 p += roundup(namelen, 4);
242 xdr_int(&p, &pairtype);
243
244 for (i = 0; features_for_read[i] != NULL; i++) {
245 if (!memcmp(pairname, features_for_read[i], namelen)) {
246 found = 1;
247 break;
248 }
249 }
250
251 if (!found) {
252 printf("ZFS: unsupported feature: %s\n", pairname);
253 rc = EIO;
254 }
255
256 p = pair + encoded_size;
257
258 pair = p;
259 xdr_int(&p, &encoded_size);
260 xdr_int(&p, &decoded_size);
261 }
262
263 return (rc);
264 }
265
266 /*
267 * Return the next nvlist in an nvlist array.
268 */
269 static const unsigned char *
nvlist_next(const unsigned char * nvlist)270 nvlist_next(const unsigned char *nvlist)
271 {
272 const unsigned char *p, *pair;
273 int junk;
274 int encoded_size, decoded_size;
275
276 p = nvlist;
277 xdr_int(&p, &junk);
278 xdr_int(&p, &junk);
279
280 pair = p;
281 xdr_int(&p, &encoded_size);
282 xdr_int(&p, &decoded_size);
283 while (encoded_size && decoded_size) {
284 p = pair + encoded_size;
285
286 pair = p;
287 xdr_int(&p, &encoded_size);
288 xdr_int(&p, &decoded_size);
289 }
290
291 return p;
292 }
293
294 #ifdef TEST
295
296 static const unsigned char *
nvlist_print(const unsigned char * nvlist,unsigned int indent)297 nvlist_print(const unsigned char *nvlist, unsigned int indent)
298 {
299 static const char* typenames[] = {
300 "DATA_TYPE_UNKNOWN",
301 "DATA_TYPE_BOOLEAN",
302 "DATA_TYPE_BYTE",
303 "DATA_TYPE_INT16",
304 "DATA_TYPE_UINT16",
305 "DATA_TYPE_INT32",
306 "DATA_TYPE_UINT32",
307 "DATA_TYPE_INT64",
308 "DATA_TYPE_UINT64",
309 "DATA_TYPE_STRING",
310 "DATA_TYPE_BYTE_ARRAY",
311 "DATA_TYPE_INT16_ARRAY",
312 "DATA_TYPE_UINT16_ARRAY",
313 "DATA_TYPE_INT32_ARRAY",
314 "DATA_TYPE_UINT32_ARRAY",
315 "DATA_TYPE_INT64_ARRAY",
316 "DATA_TYPE_UINT64_ARRAY",
317 "DATA_TYPE_STRING_ARRAY",
318 "DATA_TYPE_HRTIME",
319 "DATA_TYPE_NVLIST",
320 "DATA_TYPE_NVLIST_ARRAY",
321 "DATA_TYPE_BOOLEAN_VALUE",
322 "DATA_TYPE_INT8",
323 "DATA_TYPE_UINT8",
324 "DATA_TYPE_BOOLEAN_ARRAY",
325 "DATA_TYPE_INT8_ARRAY",
326 "DATA_TYPE_UINT8_ARRAY"
327 };
328
329 unsigned int i, j;
330 const unsigned char *p, *pair;
331 int junk;
332 int encoded_size, decoded_size;
333
334 p = nvlist;
335 xdr_int(&p, &junk);
336 xdr_int(&p, &junk);
337
338 pair = p;
339 xdr_int(&p, &encoded_size);
340 xdr_int(&p, &decoded_size);
341 while (encoded_size && decoded_size) {
342 int namelen, pairtype, elements;
343 const char *pairname;
344
345 xdr_int(&p, &namelen);
346 pairname = (const char*) p;
347 p += roundup(namelen, 4);
348 xdr_int(&p, &pairtype);
349
350 for (i = 0; i < indent; i++)
351 printf(" ");
352 printf("%s %s", typenames[pairtype], pairname);
353
354 xdr_int(&p, &elements);
355 switch (pairtype) {
356 case DATA_TYPE_UINT64: {
357 uint64_t val;
358 xdr_uint64_t(&p, &val);
359 printf(" = 0x%jx\n", (uintmax_t)val);
360 break;
361 }
362
363 case DATA_TYPE_STRING: {
364 int len;
365 xdr_int(&p, &len);
366 printf(" = \"%s\"\n", p);
367 break;
368 }
369
370 case DATA_TYPE_NVLIST:
371 printf("\n");
372 nvlist_print(p, indent + 1);
373 break;
374
375 case DATA_TYPE_NVLIST_ARRAY:
376 for (j = 0; j < elements; j++) {
377 printf("[%d]\n", j);
378 p = nvlist_print(p, indent + 1);
379 if (j != elements - 1) {
380 for (i = 0; i < indent; i++)
381 printf(" ");
382 printf("%s %s", typenames[pairtype], pairname);
383 }
384 }
385 break;
386
387 default:
388 printf("\n");
389 }
390
391 p = pair + encoded_size;
392
393 pair = p;
394 xdr_int(&p, &encoded_size);
395 xdr_int(&p, &decoded_size);
396 }
397
398 return p;
399 }
400
401 #endif
402
403 static int
vdev_read_phys(vdev_t * vdev,const blkptr_t * bp,void * buf,off_t offset,size_t size)404 vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf,
405 off_t offset, size_t size)
406 {
407 size_t psize;
408 int rc;
409
410 if (!vdev->v_phys_read)
411 return (EIO);
412
413 if (bp) {
414 psize = BP_GET_PSIZE(bp);
415 } else {
416 psize = size;
417 }
418
419 /*printf("ZFS: reading %d bytes at 0x%jx to %p\n", psize, (uintmax_t)offset, buf);*/
420 rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize);
421 if (rc)
422 return (rc);
423 if (bp && zio_checksum_verify(bp, buf))
424 return (EIO);
425
426 return (0);
427 }
428
429 static int
vdev_disk_read(vdev_t * vdev,const blkptr_t * bp,void * buf,off_t offset,size_t bytes)430 vdev_disk_read(vdev_t *vdev, const blkptr_t *bp, void *buf,
431 off_t offset, size_t bytes)
432 {
433
434 return (vdev_read_phys(vdev, bp, buf,
435 offset + VDEV_LABEL_START_SIZE, bytes));
436 }
437
438
439 static int
vdev_mirror_read(vdev_t * vdev,const blkptr_t * bp,void * buf,off_t offset,size_t bytes)440 vdev_mirror_read(vdev_t *vdev, const blkptr_t *bp, void *buf,
441 off_t offset, size_t bytes)
442 {
443 vdev_t *kid;
444 int rc;
445
446 rc = EIO;
447 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
448 if (kid->v_state != VDEV_STATE_HEALTHY)
449 continue;
450 rc = kid->v_read(kid, bp, buf, offset, bytes);
451 if (!rc)
452 return (0);
453 }
454
455 return (rc);
456 }
457
458 static int
vdev_replacing_read(vdev_t * vdev,const blkptr_t * bp,void * buf,off_t offset,size_t bytes)459 vdev_replacing_read(vdev_t *vdev, const blkptr_t *bp, void *buf,
460 off_t offset, size_t bytes)
461 {
462 vdev_t *kid;
463
464 /*
465 * Here we should have two kids:
466 * First one which is the one we are replacing and we can trust
467 * only this one to have valid data, but it might not be present.
468 * Second one is that one we are replacing with. It is most likely
469 * healthy, but we can't trust it has needed data, so we won't use it.
470 */
471 kid = STAILQ_FIRST(&vdev->v_children);
472 if (kid == NULL)
473 return (EIO);
474 if (kid->v_state != VDEV_STATE_HEALTHY)
475 return (EIO);
476 return (kid->v_read(kid, bp, buf, offset, bytes));
477 }
478
479 static vdev_t *
vdev_find(uint64_t guid)480 vdev_find(uint64_t guid)
481 {
482 vdev_t *vdev;
483
484 STAILQ_FOREACH(vdev, &zfs_vdevs, v_alllink)
485 if (vdev->v_guid == guid)
486 return (vdev);
487
488 return (0);
489 }
490
491 static vdev_t *
vdev_create(uint64_t guid,vdev_read_t * read)492 vdev_create(uint64_t guid, vdev_read_t *read)
493 {
494 vdev_t *vdev;
495
496 vdev = malloc(sizeof(vdev_t));
497 memset(vdev, 0, sizeof(vdev_t));
498 STAILQ_INIT(&vdev->v_children);
499 vdev->v_guid = guid;
500 vdev->v_state = VDEV_STATE_OFFLINE;
501 vdev->v_read = read;
502 vdev->v_phys_read = 0;
503 vdev->v_read_priv = 0;
504 STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink);
505
506 return (vdev);
507 }
508
509 static int
vdev_init_from_nvlist(const unsigned char * nvlist,vdev_t * pvdev,vdev_t ** vdevp,int is_newer)510 vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t *pvdev,
511 vdev_t **vdevp, int is_newer)
512 {
513 int rc;
514 uint64_t guid, id, ashift, nparity;
515 const char *type;
516 const char *path;
517 vdev_t *vdev, *kid;
518 const unsigned char *kids;
519 int nkids, i, is_new;
520 uint64_t is_offline, is_faulted, is_degraded, is_removed, isnt_present;
521
522 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID,
523 DATA_TYPE_UINT64, 0, &guid)
524 || nvlist_find(nvlist, ZPOOL_CONFIG_ID,
525 DATA_TYPE_UINT64, 0, &id)
526 || nvlist_find(nvlist, ZPOOL_CONFIG_TYPE,
527 DATA_TYPE_STRING, 0, &type)) {
528 printf("ZFS: can't find vdev details\n");
529 return (ENOENT);
530 }
531
532 if (strcmp(type, VDEV_TYPE_MIRROR)
533 && strcmp(type, VDEV_TYPE_DISK)
534 #ifdef ZFS_TEST
535 && strcmp(type, VDEV_TYPE_FILE)
536 #endif
537 && strcmp(type, VDEV_TYPE_RAIDZ)
538 && strcmp(type, VDEV_TYPE_REPLACING)) {
539 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n");
540 return (EIO);
541 }
542
543 is_offline = is_removed = is_faulted = is_degraded = isnt_present = 0;
544
545 nvlist_find(nvlist, ZPOOL_CONFIG_OFFLINE, DATA_TYPE_UINT64, 0,
546 &is_offline);
547 nvlist_find(nvlist, ZPOOL_CONFIG_REMOVED, DATA_TYPE_UINT64, 0,
548 &is_removed);
549 nvlist_find(nvlist, ZPOOL_CONFIG_FAULTED, DATA_TYPE_UINT64, 0,
550 &is_faulted);
551 nvlist_find(nvlist, ZPOOL_CONFIG_DEGRADED, DATA_TYPE_UINT64, 0,
552 &is_degraded);
553 nvlist_find(nvlist, ZPOOL_CONFIG_NOT_PRESENT, DATA_TYPE_UINT64, 0,
554 &isnt_present);
555
556 vdev = vdev_find(guid);
557 if (!vdev) {
558 is_new = 1;
559
560 if (!strcmp(type, VDEV_TYPE_MIRROR))
561 vdev = vdev_create(guid, vdev_mirror_read);
562 else if (!strcmp(type, VDEV_TYPE_RAIDZ))
563 vdev = vdev_create(guid, vdev_raidz_read);
564 else if (!strcmp(type, VDEV_TYPE_REPLACING))
565 vdev = vdev_create(guid, vdev_replacing_read);
566 else
567 vdev = vdev_create(guid, vdev_disk_read);
568
569 vdev->v_id = id;
570 vdev->v_top = pvdev != NULL ? pvdev : vdev;
571 if (nvlist_find(nvlist, ZPOOL_CONFIG_ASHIFT,
572 DATA_TYPE_UINT64, 0, &ashift) == 0)
573 vdev->v_ashift = ashift;
574 else
575 vdev->v_ashift = 0;
576 if (nvlist_find(nvlist, ZPOOL_CONFIG_NPARITY,
577 DATA_TYPE_UINT64, 0, &nparity) == 0)
578 vdev->v_nparity = nparity;
579 else
580 vdev->v_nparity = 0;
581 if (nvlist_find(nvlist, ZPOOL_CONFIG_PATH,
582 DATA_TYPE_STRING, 0, &path) == 0) {
583 if (strncmp(path, "/dev/", 5) == 0)
584 path += 5;
585 vdev->v_name = strdup(path);
586 } else {
587 if (!strcmp(type, "raidz")) {
588 if (vdev->v_nparity == 1)
589 vdev->v_name = "raidz1";
590 else if (vdev->v_nparity == 2)
591 vdev->v_name = "raidz2";
592 else if (vdev->v_nparity == 3)
593 vdev->v_name = "raidz3";
594 else {
595 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n");
596 return (EIO);
597 }
598 } else {
599 vdev->v_name = strdup(type);
600 }
601 }
602 } else {
603 is_new = 0;
604 }
605
606 if (is_new || is_newer) {
607 /*
608 * This is either new vdev or we've already seen this vdev,
609 * but from an older vdev label, so let's refresh its state
610 * from the newer label.
611 */
612 if (is_offline)
613 vdev->v_state = VDEV_STATE_OFFLINE;
614 else if (is_removed)
615 vdev->v_state = VDEV_STATE_REMOVED;
616 else if (is_faulted)
617 vdev->v_state = VDEV_STATE_FAULTED;
618 else if (is_degraded)
619 vdev->v_state = VDEV_STATE_DEGRADED;
620 else if (isnt_present)
621 vdev->v_state = VDEV_STATE_CANT_OPEN;
622 }
623
624 rc = nvlist_find(nvlist, ZPOOL_CONFIG_CHILDREN,
625 DATA_TYPE_NVLIST_ARRAY, &nkids, &kids);
626 /*
627 * Its ok if we don't have any kids.
628 */
629 if (rc == 0) {
630 vdev->v_nchildren = nkids;
631 for (i = 0; i < nkids; i++) {
632 rc = vdev_init_from_nvlist(kids, vdev, &kid, is_newer);
633 if (rc)
634 return (rc);
635 if (is_new)
636 STAILQ_INSERT_TAIL(&vdev->v_children, kid,
637 v_childlink);
638 kids = nvlist_next(kids);
639 }
640 } else {
641 vdev->v_nchildren = 0;
642 }
643
644 if (vdevp)
645 *vdevp = vdev;
646 return (0);
647 }
648
649 static void
vdev_set_state(vdev_t * vdev)650 vdev_set_state(vdev_t *vdev)
651 {
652 vdev_t *kid;
653 int good_kids;
654 int bad_kids;
655
656 /*
657 * A mirror or raidz is healthy if all its kids are healthy. A
658 * mirror is degraded if any of its kids is healthy; a raidz
659 * is degraded if at most nparity kids are offline.
660 */
661 if (STAILQ_FIRST(&vdev->v_children)) {
662 good_kids = 0;
663 bad_kids = 0;
664 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
665 if (kid->v_state == VDEV_STATE_HEALTHY)
666 good_kids++;
667 else
668 bad_kids++;
669 }
670 if (bad_kids == 0) {
671 vdev->v_state = VDEV_STATE_HEALTHY;
672 } else {
673 if (vdev->v_read == vdev_mirror_read) {
674 if (good_kids) {
675 vdev->v_state = VDEV_STATE_DEGRADED;
676 } else {
677 vdev->v_state = VDEV_STATE_OFFLINE;
678 }
679 } else if (vdev->v_read == vdev_raidz_read) {
680 if (bad_kids > vdev->v_nparity) {
681 vdev->v_state = VDEV_STATE_OFFLINE;
682 } else {
683 vdev->v_state = VDEV_STATE_DEGRADED;
684 }
685 }
686 }
687 }
688 }
689
690 static spa_t *
spa_find_by_guid(uint64_t guid)691 spa_find_by_guid(uint64_t guid)
692 {
693 spa_t *spa;
694
695 STAILQ_FOREACH(spa, &zfs_pools, spa_link)
696 if (spa->spa_guid == guid)
697 return (spa);
698
699 return (0);
700 }
701
702 static spa_t *
spa_find_by_name(const char * name)703 spa_find_by_name(const char *name)
704 {
705 spa_t *spa;
706
707 STAILQ_FOREACH(spa, &zfs_pools, spa_link)
708 if (!strcmp(spa->spa_name, name))
709 return (spa);
710
711 return (0);
712 }
713
714 #ifdef BOOT2
715 static spa_t *
spa_get_primary(void)716 spa_get_primary(void)
717 {
718
719 return (STAILQ_FIRST(&zfs_pools));
720 }
721
722 static vdev_t *
spa_get_primary_vdev(const spa_t * spa)723 spa_get_primary_vdev(const spa_t *spa)
724 {
725 vdev_t *vdev;
726 vdev_t *kid;
727
728 if (spa == NULL)
729 spa = spa_get_primary();
730 if (spa == NULL)
731 return (NULL);
732 vdev = STAILQ_FIRST(&spa->spa_vdevs);
733 if (vdev == NULL)
734 return (NULL);
735 for (kid = STAILQ_FIRST(&vdev->v_children); kid != NULL;
736 kid = STAILQ_FIRST(&vdev->v_children))
737 vdev = kid;
738 return (vdev);
739 }
740 #endif
741
742 static spa_t *
spa_create(uint64_t guid)743 spa_create(uint64_t guid)
744 {
745 spa_t *spa;
746
747 spa = malloc(sizeof(spa_t));
748 memset(spa, 0, sizeof(spa_t));
749 STAILQ_INIT(&spa->spa_vdevs);
750 spa->spa_guid = guid;
751 STAILQ_INSERT_TAIL(&zfs_pools, spa, spa_link);
752
753 return (spa);
754 }
755
756 static const char *
state_name(vdev_state_t state)757 state_name(vdev_state_t state)
758 {
759 static const char* names[] = {
760 "UNKNOWN",
761 "CLOSED",
762 "OFFLINE",
763 "REMOVED",
764 "CANT_OPEN",
765 "FAULTED",
766 "DEGRADED",
767 "ONLINE"
768 };
769 return names[state];
770 }
771
772 #ifdef BOOT2
773
774 #define pager_printf printf
775
776 #else
777
778 static void
pager_printf(const char * fmt,...)779 pager_printf(const char *fmt, ...)
780 {
781 char line[80];
782 va_list args;
783
784 va_start(args, fmt);
785 vsprintf(line, fmt, args);
786 va_end(args);
787 pager_output(line);
788 }
789
790 #endif
791
792 #define STATUS_FORMAT " %s %s\n"
793
794 static void
print_state(int indent,const char * name,vdev_state_t state)795 print_state(int indent, const char *name, vdev_state_t state)
796 {
797 int i;
798 char buf[512];
799
800 buf[0] = 0;
801 for (i = 0; i < indent; i++)
802 strcat(buf, " ");
803 strcat(buf, name);
804 pager_printf(STATUS_FORMAT, buf, state_name(state));
805
806 }
807
808 static void
vdev_status(vdev_t * vdev,int indent)809 vdev_status(vdev_t *vdev, int indent)
810 {
811 vdev_t *kid;
812 print_state(indent, vdev->v_name, vdev->v_state);
813
814 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
815 vdev_status(kid, indent + 1);
816 }
817 }
818
819 static void
spa_status(spa_t * spa)820 spa_status(spa_t *spa)
821 {
822 static char bootfs[ZFS_MAXNAMELEN];
823 uint64_t rootid;
824 vdev_t *vdev;
825 int good_kids, bad_kids, degraded_kids;
826 vdev_state_t state;
827
828 pager_printf(" pool: %s\n", spa->spa_name);
829 if (zfs_get_root(spa, &rootid) == 0 &&
830 zfs_rlookup(spa, rootid, bootfs) == 0) {
831 if (bootfs[0] == '\0')
832 pager_printf("bootfs: %s\n", spa->spa_name);
833 else
834 pager_printf("bootfs: %s/%s\n", spa->spa_name, bootfs);
835 }
836 pager_printf("config:\n\n");
837 pager_printf(STATUS_FORMAT, "NAME", "STATE");
838
839 good_kids = 0;
840 degraded_kids = 0;
841 bad_kids = 0;
842 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) {
843 if (vdev->v_state == VDEV_STATE_HEALTHY)
844 good_kids++;
845 else if (vdev->v_state == VDEV_STATE_DEGRADED)
846 degraded_kids++;
847 else
848 bad_kids++;
849 }
850
851 state = VDEV_STATE_CLOSED;
852 if (good_kids > 0 && (degraded_kids + bad_kids) == 0)
853 state = VDEV_STATE_HEALTHY;
854 else if ((good_kids + degraded_kids) > 0)
855 state = VDEV_STATE_DEGRADED;
856
857 print_state(0, spa->spa_name, state);
858 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) {
859 vdev_status(vdev, 1);
860 }
861 }
862
863 static void
spa_all_status(void)864 spa_all_status(void)
865 {
866 spa_t *spa;
867 int first = 1;
868
869 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
870 if (!first)
871 pager_printf("\n");
872 first = 0;
873 spa_status(spa);
874 }
875 }
876
877 static int
vdev_probe(vdev_phys_read_t * read,void * read_priv,spa_t ** spap)878 vdev_probe(vdev_phys_read_t *read, void *read_priv, spa_t **spap)
879 {
880 vdev_t vtmp;
881 vdev_phys_t *vdev_label = (vdev_phys_t *) zap_scratch;
882 spa_t *spa;
883 vdev_t *vdev, *top_vdev, *pool_vdev;
884 off_t off;
885 blkptr_t bp;
886 const unsigned char *nvlist;
887 uint64_t val;
888 uint64_t guid;
889 uint64_t pool_txg, pool_guid;
890 uint64_t is_log;
891 const char *pool_name;
892 const unsigned char *vdevs;
893 const unsigned char *features;
894 int i, rc, is_newer;
895 char *upbuf;
896 const struct uberblock *up;
897
898 /*
899 * Load the vdev label and figure out which
900 * uberblock is most current.
901 */
902 memset(&vtmp, 0, sizeof(vtmp));
903 vtmp.v_phys_read = read;
904 vtmp.v_read_priv = read_priv;
905 off = offsetof(vdev_label_t, vl_vdev_phys);
906 BP_ZERO(&bp);
907 BP_SET_LSIZE(&bp, sizeof(vdev_phys_t));
908 BP_SET_PSIZE(&bp, sizeof(vdev_phys_t));
909 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL);
910 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF);
911 DVA_SET_OFFSET(BP_IDENTITY(&bp), off);
912 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0);
913 if (vdev_read_phys(&vtmp, &bp, vdev_label, off, 0))
914 return (EIO);
915
916 if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) {
917 return (EIO);
918 }
919
920 nvlist = (const unsigned char *) vdev_label->vp_nvlist + 4;
921
922 if (nvlist_find(nvlist,
923 ZPOOL_CONFIG_VERSION,
924 DATA_TYPE_UINT64, 0, &val)) {
925 return (EIO);
926 }
927
928 if (!SPA_VERSION_IS_SUPPORTED(val)) {
929 printf("ZFS: unsupported ZFS version %u (should be %u)\n",
930 (unsigned) val, (unsigned) SPA_VERSION);
931 return (EIO);
932 }
933
934 /* Check ZFS features for read */
935 if (nvlist_find(nvlist,
936 ZPOOL_CONFIG_FEATURES_FOR_READ,
937 DATA_TYPE_NVLIST, 0, &features) == 0
938 && nvlist_check_features_for_read(features) != 0)
939 return (EIO);
940
941 if (nvlist_find(nvlist,
942 ZPOOL_CONFIG_POOL_STATE,
943 DATA_TYPE_UINT64, 0, &val)) {
944 return (EIO);
945 }
946
947 if (val == POOL_STATE_DESTROYED) {
948 /* We don't boot only from destroyed pools. */
949 return (EIO);
950 }
951
952 if (nvlist_find(nvlist,
953 ZPOOL_CONFIG_POOL_TXG,
954 DATA_TYPE_UINT64, 0, &pool_txg)
955 || nvlist_find(nvlist,
956 ZPOOL_CONFIG_POOL_GUID,
957 DATA_TYPE_UINT64, 0, &pool_guid)
958 || nvlist_find(nvlist,
959 ZPOOL_CONFIG_POOL_NAME,
960 DATA_TYPE_STRING, 0, &pool_name)) {
961 /*
962 * Cache and spare devices end up here - just ignore
963 * them.
964 */
965 /*printf("ZFS: can't find pool details\n");*/
966 return (EIO);
967 }
968
969 is_log = 0;
970 (void) nvlist_find(nvlist, ZPOOL_CONFIG_IS_LOG, DATA_TYPE_UINT64, 0,
971 &is_log);
972 if (is_log)
973 return (EIO);
974
975 /*
976 * Create the pool if this is the first time we've seen it.
977 */
978 spa = spa_find_by_guid(pool_guid);
979 if (!spa) {
980 spa = spa_create(pool_guid);
981 spa->spa_name = strdup(pool_name);
982 }
983 if (pool_txg > spa->spa_txg) {
984 spa->spa_txg = pool_txg;
985 is_newer = 1;
986 } else
987 is_newer = 0;
988
989 /*
990 * Get the vdev tree and create our in-core copy of it.
991 * If we already have a vdev with this guid, this must
992 * be some kind of alias (overlapping slices, dangerously dedicated
993 * disks etc).
994 */
995 if (nvlist_find(nvlist,
996 ZPOOL_CONFIG_GUID,
997 DATA_TYPE_UINT64, 0, &guid)) {
998 return (EIO);
999 }
1000 vdev = vdev_find(guid);
1001 if (vdev && vdev->v_phys_read) /* Has this vdev already been inited? */
1002 return (EIO);
1003
1004 if (nvlist_find(nvlist,
1005 ZPOOL_CONFIG_VDEV_TREE,
1006 DATA_TYPE_NVLIST, 0, &vdevs)) {
1007 return (EIO);
1008 }
1009
1010 rc = vdev_init_from_nvlist(vdevs, NULL, &top_vdev, is_newer);
1011 if (rc)
1012 return (rc);
1013
1014 /*
1015 * Add the toplevel vdev to the pool if its not already there.
1016 */
1017 STAILQ_FOREACH(pool_vdev, &spa->spa_vdevs, v_childlink)
1018 if (top_vdev == pool_vdev)
1019 break;
1020 if (!pool_vdev && top_vdev)
1021 STAILQ_INSERT_TAIL(&spa->spa_vdevs, top_vdev, v_childlink);
1022
1023 /*
1024 * We should already have created an incomplete vdev for this
1025 * vdev. Find it and initialise it with our read proc.
1026 */
1027 vdev = vdev_find(guid);
1028 if (vdev) {
1029 vdev->v_phys_read = read;
1030 vdev->v_read_priv = read_priv;
1031 vdev->v_state = VDEV_STATE_HEALTHY;
1032 } else {
1033 printf("ZFS: inconsistent nvlist contents\n");
1034 return (EIO);
1035 }
1036
1037 /*
1038 * Re-evaluate top-level vdev state.
1039 */
1040 vdev_set_state(top_vdev);
1041
1042 /*
1043 * Ok, we are happy with the pool so far. Lets find
1044 * the best uberblock and then we can actually access
1045 * the contents of the pool.
1046 */
1047 upbuf = zfs_alloc(VDEV_UBERBLOCK_SIZE(vdev));
1048 up = (const struct uberblock *)upbuf;
1049 for (i = 0;
1050 i < VDEV_UBERBLOCK_COUNT(vdev);
1051 i++) {
1052 off = VDEV_UBERBLOCK_OFFSET(vdev, i);
1053 BP_ZERO(&bp);
1054 DVA_SET_OFFSET(&bp.blk_dva[0], off);
1055 BP_SET_LSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev));
1056 BP_SET_PSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev));
1057 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL);
1058 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF);
1059 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0);
1060
1061 if (vdev_read_phys(vdev, &bp, upbuf, off, 0))
1062 continue;
1063
1064 if (up->ub_magic != UBERBLOCK_MAGIC)
1065 continue;
1066 if (up->ub_txg < spa->spa_txg)
1067 continue;
1068 if (up->ub_txg > spa->spa_uberblock.ub_txg) {
1069 spa->spa_uberblock = *up;
1070 } else if (up->ub_txg == spa->spa_uberblock.ub_txg) {
1071 if (up->ub_timestamp > spa->spa_uberblock.ub_timestamp)
1072 spa->spa_uberblock = *up;
1073 }
1074 }
1075 zfs_free(upbuf, VDEV_UBERBLOCK_SIZE(vdev));
1076
1077 if (spap)
1078 *spap = spa;
1079 return (0);
1080 }
1081
1082 static int
ilog2(int n)1083 ilog2(int n)
1084 {
1085 int v;
1086
1087 for (v = 0; v < 32; v++)
1088 if (n == (1 << v))
1089 return v;
1090 return -1;
1091 }
1092
1093 static int
zio_read_gang(const spa_t * spa,const blkptr_t * bp,void * buf)1094 zio_read_gang(const spa_t *spa, const blkptr_t *bp, void *buf)
1095 {
1096 blkptr_t gbh_bp;
1097 zio_gbh_phys_t zio_gb;
1098 char *pbuf;
1099 int i;
1100
1101 /* Artificial BP for gang block header. */
1102 gbh_bp = *bp;
1103 BP_SET_PSIZE(&gbh_bp, SPA_GANGBLOCKSIZE);
1104 BP_SET_LSIZE(&gbh_bp, SPA_GANGBLOCKSIZE);
1105 BP_SET_CHECKSUM(&gbh_bp, ZIO_CHECKSUM_GANG_HEADER);
1106 BP_SET_COMPRESS(&gbh_bp, ZIO_COMPRESS_OFF);
1107 for (i = 0; i < SPA_DVAS_PER_BP; i++)
1108 DVA_SET_GANG(&gbh_bp.blk_dva[i], 0);
1109
1110 /* Read gang header block using the artificial BP. */
1111 if (zio_read(spa, &gbh_bp, &zio_gb))
1112 return (EIO);
1113
1114 pbuf = buf;
1115 for (i = 0; i < SPA_GBH_NBLKPTRS; i++) {
1116 blkptr_t *gbp = &zio_gb.zg_blkptr[i];
1117
1118 if (BP_IS_HOLE(gbp))
1119 continue;
1120 if (zio_read(spa, gbp, pbuf))
1121 return (EIO);
1122 pbuf += BP_GET_PSIZE(gbp);
1123 }
1124
1125 if (zio_checksum_verify(bp, buf))
1126 return (EIO);
1127 return (0);
1128 }
1129
1130 static int
zio_read(const spa_t * spa,const blkptr_t * bp,void * buf)1131 zio_read(const spa_t *spa, const blkptr_t *bp, void *buf)
1132 {
1133 int cpfunc = BP_GET_COMPRESS(bp);
1134 uint64_t align, size;
1135 void *pbuf;
1136 int i, error;
1137
1138 /*
1139 * Process data embedded in block pointer
1140 */
1141 if (BP_IS_EMBEDDED(bp)) {
1142 ASSERT(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA);
1143
1144 size = BPE_GET_PSIZE(bp);
1145 ASSERT(size <= BPE_PAYLOAD_SIZE);
1146
1147 if (cpfunc != ZIO_COMPRESS_OFF)
1148 pbuf = zfs_alloc(size);
1149 else
1150 pbuf = buf;
1151
1152 decode_embedded_bp_compressed(bp, pbuf);
1153 error = 0;
1154
1155 if (cpfunc != ZIO_COMPRESS_OFF) {
1156 error = zio_decompress_data(cpfunc, pbuf,
1157 size, buf, BP_GET_LSIZE(bp));
1158 zfs_free(pbuf, size);
1159 }
1160 if (error != 0)
1161 printf("ZFS: i/o error - unable to decompress block pointer data, error %d\n",
1162 error);
1163 return (error);
1164 }
1165
1166 error = EIO;
1167
1168 for (i = 0; i < SPA_DVAS_PER_BP; i++) {
1169 const dva_t *dva = &bp->blk_dva[i];
1170 vdev_t *vdev;
1171 int vdevid;
1172 off_t offset;
1173
1174 if (!dva->dva_word[0] && !dva->dva_word[1])
1175 continue;
1176
1177 vdevid = DVA_GET_VDEV(dva);
1178 offset = DVA_GET_OFFSET(dva);
1179 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) {
1180 if (vdev->v_id == vdevid)
1181 break;
1182 }
1183 if (!vdev || !vdev->v_read)
1184 continue;
1185
1186 size = BP_GET_PSIZE(bp);
1187 if (vdev->v_read == vdev_raidz_read) {
1188 align = 1ULL << vdev->v_top->v_ashift;
1189 if (P2PHASE(size, align) != 0)
1190 size = P2ROUNDUP(size, align);
1191 }
1192 if (size != BP_GET_PSIZE(bp) || cpfunc != ZIO_COMPRESS_OFF)
1193 pbuf = zfs_alloc(size);
1194 else
1195 pbuf = buf;
1196
1197 if (DVA_GET_GANG(dva))
1198 error = zio_read_gang(spa, bp, pbuf);
1199 else
1200 error = vdev->v_read(vdev, bp, pbuf, offset, size);
1201 if (error == 0) {
1202 if (cpfunc != ZIO_COMPRESS_OFF)
1203 error = zio_decompress_data(cpfunc, pbuf,
1204 BP_GET_PSIZE(bp), buf, BP_GET_LSIZE(bp));
1205 else if (size != BP_GET_PSIZE(bp))
1206 bcopy(pbuf, buf, BP_GET_PSIZE(bp));
1207 }
1208 if (buf != pbuf)
1209 zfs_free(pbuf, size);
1210 if (error == 0)
1211 break;
1212 }
1213 if (error != 0)
1214 printf("ZFS: i/o error - all block copies unavailable\n");
1215 return (error);
1216 }
1217
1218 static int
dnode_read(const spa_t * spa,const dnode_phys_t * dnode,off_t offset,void * buf,size_t buflen)1219 dnode_read(const spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf, size_t buflen)
1220 {
1221 int ibshift = dnode->dn_indblkshift - SPA_BLKPTRSHIFT;
1222 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
1223 int nlevels = dnode->dn_nlevels;
1224 int i, rc;
1225
1226 if (bsize > SPA_MAXBLOCKSIZE) {
1227 printf("ZFS: I/O error - blocks larger than 128K are not supported\n");
1228 return (EIO);
1229 }
1230
1231 /*
1232 * Note: bsize may not be a power of two here so we need to do an
1233 * actual divide rather than a bitshift.
1234 */
1235 while (buflen > 0) {
1236 uint64_t bn = offset / bsize;
1237 int boff = offset % bsize;
1238 int ibn;
1239 const blkptr_t *indbp;
1240 blkptr_t bp;
1241
1242 if (bn > dnode->dn_maxblkid)
1243 return (EIO);
1244
1245 if (dnode == dnode_cache_obj && bn == dnode_cache_bn)
1246 goto cached;
1247
1248 indbp = dnode->dn_blkptr;
1249 for (i = 0; i < nlevels; i++) {
1250 /*
1251 * Copy the bp from the indirect array so that
1252 * we can re-use the scratch buffer for multi-level
1253 * objects.
1254 */
1255 ibn = bn >> ((nlevels - i - 1) * ibshift);
1256 ibn &= ((1 << ibshift) - 1);
1257 bp = indbp[ibn];
1258 if (BP_IS_HOLE(&bp)) {
1259 memset(dnode_cache_buf, 0, bsize);
1260 break;
1261 }
1262 rc = zio_read(spa, &bp, dnode_cache_buf);
1263 if (rc)
1264 return (rc);
1265 indbp = (const blkptr_t *) dnode_cache_buf;
1266 }
1267 dnode_cache_obj = dnode;
1268 dnode_cache_bn = bn;
1269 cached:
1270
1271 /*
1272 * The buffer contains our data block. Copy what we
1273 * need from it and loop.
1274 */
1275 i = bsize - boff;
1276 if (i > buflen) i = buflen;
1277 memcpy(buf, &dnode_cache_buf[boff], i);
1278 buf = ((char*) buf) + i;
1279 offset += i;
1280 buflen -= i;
1281 }
1282
1283 return (0);
1284 }
1285
1286 /*
1287 * Lookup a value in a microzap directory. Assumes that the zap
1288 * scratch buffer contains the directory contents.
1289 */
1290 static int
mzap_lookup(const dnode_phys_t * dnode,const char * name,uint64_t * value)1291 mzap_lookup(const dnode_phys_t *dnode, const char *name, uint64_t *value)
1292 {
1293 const mzap_phys_t *mz;
1294 const mzap_ent_phys_t *mze;
1295 size_t size;
1296 int chunks, i;
1297
1298 /*
1299 * Microzap objects use exactly one block. Read the whole
1300 * thing.
1301 */
1302 size = dnode->dn_datablkszsec * 512;
1303
1304 mz = (const mzap_phys_t *) zap_scratch;
1305 chunks = size / MZAP_ENT_LEN - 1;
1306
1307 for (i = 0; i < chunks; i++) {
1308 mze = &mz->mz_chunk[i];
1309 if (!strcmp(mze->mze_name, name)) {
1310 *value = mze->mze_value;
1311 return (0);
1312 }
1313 }
1314
1315 return (ENOENT);
1316 }
1317
1318 /*
1319 * Compare a name with a zap leaf entry. Return non-zero if the name
1320 * matches.
1321 */
1322 static int
fzap_name_equal(const zap_leaf_t * zl,const zap_leaf_chunk_t * zc,const char * name)1323 fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name)
1324 {
1325 size_t namelen;
1326 const zap_leaf_chunk_t *nc;
1327 const char *p;
1328
1329 namelen = zc->l_entry.le_name_numints;
1330
1331 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk);
1332 p = name;
1333 while (namelen > 0) {
1334 size_t len;
1335 len = namelen;
1336 if (len > ZAP_LEAF_ARRAY_BYTES)
1337 len = ZAP_LEAF_ARRAY_BYTES;
1338 if (memcmp(p, nc->l_array.la_array, len))
1339 return (0);
1340 p += len;
1341 namelen -= len;
1342 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next);
1343 }
1344
1345 return 1;
1346 }
1347
1348 /*
1349 * Extract a uint64_t value from a zap leaf entry.
1350 */
1351 static uint64_t
fzap_leaf_value(const zap_leaf_t * zl,const zap_leaf_chunk_t * zc)1352 fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc)
1353 {
1354 const zap_leaf_chunk_t *vc;
1355 int i;
1356 uint64_t value;
1357 const uint8_t *p;
1358
1359 vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk);
1360 for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) {
1361 value = (value << 8) | p[i];
1362 }
1363
1364 return value;
1365 }
1366
1367 /*
1368 * Lookup a value in a fatzap directory. Assumes that the zap scratch
1369 * buffer contains the directory header.
1370 */
1371 static int
fzap_lookup(const spa_t * spa,const dnode_phys_t * dnode,const char * name,uint64_t * value)1372 fzap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value)
1373 {
1374 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
1375 zap_phys_t zh = *(zap_phys_t *) zap_scratch;
1376 fat_zap_t z;
1377 uint64_t *ptrtbl;
1378 uint64_t hash;
1379 int rc;
1380
1381 if (zh.zap_magic != ZAP_MAGIC)
1382 return (EIO);
1383
1384 z.zap_block_shift = ilog2(bsize);
1385 z.zap_phys = (zap_phys_t *) zap_scratch;
1386
1387 /*
1388 * Figure out where the pointer table is and read it in if necessary.
1389 */
1390 if (zh.zap_ptrtbl.zt_blk) {
1391 rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize,
1392 zap_scratch, bsize);
1393 if (rc)
1394 return (rc);
1395 ptrtbl = (uint64_t *) zap_scratch;
1396 } else {
1397 ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0);
1398 }
1399
1400 hash = zap_hash(zh.zap_salt, name);
1401
1402 zap_leaf_t zl;
1403 zl.l_bs = z.zap_block_shift;
1404
1405 off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs;
1406 zap_leaf_chunk_t *zc;
1407
1408 rc = dnode_read(spa, dnode, off, zap_scratch, bsize);
1409 if (rc)
1410 return (rc);
1411
1412 zl.l_phys = (zap_leaf_phys_t *) zap_scratch;
1413
1414 /*
1415 * Make sure this chunk matches our hash.
1416 */
1417 if (zl.l_phys->l_hdr.lh_prefix_len > 0
1418 && zl.l_phys->l_hdr.lh_prefix
1419 != hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len))
1420 return (ENOENT);
1421
1422 /*
1423 * Hash within the chunk to find our entry.
1424 */
1425 int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len);
1426 int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1);
1427 h = zl.l_phys->l_hash[h];
1428 if (h == 0xffff)
1429 return (ENOENT);
1430 zc = &ZAP_LEAF_CHUNK(&zl, h);
1431 while (zc->l_entry.le_hash != hash) {
1432 if (zc->l_entry.le_next == 0xffff) {
1433 zc = 0;
1434 break;
1435 }
1436 zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next);
1437 }
1438 if (fzap_name_equal(&zl, zc, name)) {
1439 if (zc->l_entry.le_value_intlen * zc->l_entry.le_value_numints > 8)
1440 return (E2BIG);
1441 *value = fzap_leaf_value(&zl, zc);
1442 return (0);
1443 }
1444
1445 return (ENOENT);
1446 }
1447
1448 /*
1449 * Lookup a name in a zap object and return its value as a uint64_t.
1450 */
1451 static int
zap_lookup(const spa_t * spa,const dnode_phys_t * dnode,const char * name,uint64_t * value)1452 zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value)
1453 {
1454 int rc;
1455 uint64_t zap_type;
1456 size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
1457
1458 rc = dnode_read(spa, dnode, 0, zap_scratch, size);
1459 if (rc)
1460 return (rc);
1461
1462 zap_type = *(uint64_t *) zap_scratch;
1463 if (zap_type == ZBT_MICRO)
1464 return mzap_lookup(dnode, name, value);
1465 else if (zap_type == ZBT_HEADER)
1466 return fzap_lookup(spa, dnode, name, value);
1467 printf("ZFS: invalid zap_type=%d\n", (int)zap_type);
1468 return (EIO);
1469 }
1470
1471 /*
1472 * List a microzap directory. Assumes that the zap scratch buffer contains
1473 * the directory contents.
1474 */
1475 static int
mzap_list(const dnode_phys_t * dnode,int (* callback)(const char *))1476 mzap_list(const dnode_phys_t *dnode, int (*callback)(const char *))
1477 {
1478 const mzap_phys_t *mz;
1479 const mzap_ent_phys_t *mze;
1480 size_t size;
1481 int chunks, i;
1482
1483 /*
1484 * Microzap objects use exactly one block. Read the whole
1485 * thing.
1486 */
1487 size = dnode->dn_datablkszsec * 512;
1488 mz = (const mzap_phys_t *) zap_scratch;
1489 chunks = size / MZAP_ENT_LEN - 1;
1490
1491 for (i = 0; i < chunks; i++) {
1492 mze = &mz->mz_chunk[i];
1493 if (mze->mze_name[0])
1494 //printf("%-32s 0x%jx\n", mze->mze_name, (uintmax_t)mze->mze_value);
1495 callback(mze->mze_name);
1496 }
1497
1498 return (0);
1499 }
1500
1501 /*
1502 * List a fatzap directory. Assumes that the zap scratch buffer contains
1503 * the directory header.
1504 */
1505 static int
fzap_list(const spa_t * spa,const dnode_phys_t * dnode,int (* callback)(const char *))1506 fzap_list(const spa_t *spa, const dnode_phys_t *dnode, int (*callback)(const char *))
1507 {
1508 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
1509 zap_phys_t zh = *(zap_phys_t *) zap_scratch;
1510 fat_zap_t z;
1511 int i, j;
1512
1513 if (zh.zap_magic != ZAP_MAGIC)
1514 return (EIO);
1515
1516 z.zap_block_shift = ilog2(bsize);
1517 z.zap_phys = (zap_phys_t *) zap_scratch;
1518
1519 /*
1520 * This assumes that the leaf blocks start at block 1. The
1521 * documentation isn't exactly clear on this.
1522 */
1523 zap_leaf_t zl;
1524 zl.l_bs = z.zap_block_shift;
1525 for (i = 0; i < zh.zap_num_leafs; i++) {
1526 off_t off = (i + 1) << zl.l_bs;
1527 char name[256], *p;
1528 uint64_t value;
1529
1530 if (dnode_read(spa, dnode, off, zap_scratch, bsize))
1531 return (EIO);
1532
1533 zl.l_phys = (zap_leaf_phys_t *) zap_scratch;
1534
1535 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) {
1536 zap_leaf_chunk_t *zc, *nc;
1537 int namelen;
1538
1539 zc = &ZAP_LEAF_CHUNK(&zl, j);
1540 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
1541 continue;
1542 namelen = zc->l_entry.le_name_numints;
1543 if (namelen > sizeof(name))
1544 namelen = sizeof(name);
1545
1546 /*
1547 * Paste the name back together.
1548 */
1549 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
1550 p = name;
1551 while (namelen > 0) {
1552 int len;
1553 len = namelen;
1554 if (len > ZAP_LEAF_ARRAY_BYTES)
1555 len = ZAP_LEAF_ARRAY_BYTES;
1556 memcpy(p, nc->l_array.la_array, len);
1557 p += len;
1558 namelen -= len;
1559 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
1560 }
1561
1562 /*
1563 * Assume the first eight bytes of the value are
1564 * a uint64_t.
1565 */
1566 value = fzap_leaf_value(&zl, zc);
1567
1568 //printf("%s 0x%jx\n", name, (uintmax_t)value);
1569 callback((const char *)name);
1570 }
1571 }
1572
1573 return (0);
1574 }
1575
zfs_printf(const char * name)1576 static int zfs_printf(const char *name)
1577 {
1578
1579 printf("%s\n", name);
1580
1581 return (0);
1582 }
1583
1584 /*
1585 * List a zap directory.
1586 */
1587 static int
zap_list(const spa_t * spa,const dnode_phys_t * dnode)1588 zap_list(const spa_t *spa, const dnode_phys_t *dnode)
1589 {
1590 uint64_t zap_type;
1591 size_t size = dnode->dn_datablkszsec * 512;
1592
1593 if (dnode_read(spa, dnode, 0, zap_scratch, size))
1594 return (EIO);
1595
1596 zap_type = *(uint64_t *) zap_scratch;
1597 if (zap_type == ZBT_MICRO)
1598 return mzap_list(dnode, zfs_printf);
1599 else
1600 return fzap_list(spa, dnode, zfs_printf);
1601 }
1602
1603 static int
objset_get_dnode(const spa_t * spa,const objset_phys_t * os,uint64_t objnum,dnode_phys_t * dnode)1604 objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode)
1605 {
1606 off_t offset;
1607
1608 offset = objnum * sizeof(dnode_phys_t);
1609 return dnode_read(spa, &os->os_meta_dnode, offset,
1610 dnode, sizeof(dnode_phys_t));
1611 }
1612
1613 static int
mzap_rlookup(const spa_t * spa,const dnode_phys_t * dnode,char * name,uint64_t value)1614 mzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value)
1615 {
1616 const mzap_phys_t *mz;
1617 const mzap_ent_phys_t *mze;
1618 size_t size;
1619 int chunks, i;
1620
1621 /*
1622 * Microzap objects use exactly one block. Read the whole
1623 * thing.
1624 */
1625 size = dnode->dn_datablkszsec * 512;
1626
1627 mz = (const mzap_phys_t *) zap_scratch;
1628 chunks = size / MZAP_ENT_LEN - 1;
1629
1630 for (i = 0; i < chunks; i++) {
1631 mze = &mz->mz_chunk[i];
1632 if (value == mze->mze_value) {
1633 strcpy(name, mze->mze_name);
1634 return (0);
1635 }
1636 }
1637
1638 return (ENOENT);
1639 }
1640
1641 static void
fzap_name_copy(const zap_leaf_t * zl,const zap_leaf_chunk_t * zc,char * name)1642 fzap_name_copy(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, char *name)
1643 {
1644 size_t namelen;
1645 const zap_leaf_chunk_t *nc;
1646 char *p;
1647
1648 namelen = zc->l_entry.le_name_numints;
1649
1650 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk);
1651 p = name;
1652 while (namelen > 0) {
1653 size_t len;
1654 len = namelen;
1655 if (len > ZAP_LEAF_ARRAY_BYTES)
1656 len = ZAP_LEAF_ARRAY_BYTES;
1657 memcpy(p, nc->l_array.la_array, len);
1658 p += len;
1659 namelen -= len;
1660 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next);
1661 }
1662
1663 *p = '\0';
1664 }
1665
1666 static int
fzap_rlookup(const spa_t * spa,const dnode_phys_t * dnode,char * name,uint64_t value)1667 fzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value)
1668 {
1669 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
1670 zap_phys_t zh = *(zap_phys_t *) zap_scratch;
1671 fat_zap_t z;
1672 int i, j;
1673
1674 if (zh.zap_magic != ZAP_MAGIC)
1675 return (EIO);
1676
1677 z.zap_block_shift = ilog2(bsize);
1678 z.zap_phys = (zap_phys_t *) zap_scratch;
1679
1680 /*
1681 * This assumes that the leaf blocks start at block 1. The
1682 * documentation isn't exactly clear on this.
1683 */
1684 zap_leaf_t zl;
1685 zl.l_bs = z.zap_block_shift;
1686 for (i = 0; i < zh.zap_num_leafs; i++) {
1687 off_t off = (i + 1) << zl.l_bs;
1688
1689 if (dnode_read(spa, dnode, off, zap_scratch, bsize))
1690 return (EIO);
1691
1692 zl.l_phys = (zap_leaf_phys_t *) zap_scratch;
1693
1694 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) {
1695 zap_leaf_chunk_t *zc;
1696
1697 zc = &ZAP_LEAF_CHUNK(&zl, j);
1698 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
1699 continue;
1700 if (zc->l_entry.le_value_intlen != 8 ||
1701 zc->l_entry.le_value_numints != 1)
1702 continue;
1703
1704 if (fzap_leaf_value(&zl, zc) == value) {
1705 fzap_name_copy(&zl, zc, name);
1706 return (0);
1707 }
1708 }
1709 }
1710
1711 return (ENOENT);
1712 }
1713
1714 static int
zap_rlookup(const spa_t * spa,const dnode_phys_t * dnode,char * name,uint64_t value)1715 zap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value)
1716 {
1717 int rc;
1718 uint64_t zap_type;
1719 size_t size = dnode->dn_datablkszsec * 512;
1720
1721 rc = dnode_read(spa, dnode, 0, zap_scratch, size);
1722 if (rc)
1723 return (rc);
1724
1725 zap_type = *(uint64_t *) zap_scratch;
1726 if (zap_type == ZBT_MICRO)
1727 return mzap_rlookup(spa, dnode, name, value);
1728 else
1729 return fzap_rlookup(spa, dnode, name, value);
1730 }
1731
1732 static int
zfs_rlookup(const spa_t * spa,uint64_t objnum,char * result)1733 zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result)
1734 {
1735 char name[256];
1736 char component[256];
1737 uint64_t dir_obj, parent_obj, child_dir_zapobj;
1738 dnode_phys_t child_dir_zap, dataset, dir, parent;
1739 dsl_dir_phys_t *dd;
1740 dsl_dataset_phys_t *ds;
1741 char *p;
1742 int len;
1743
1744 p = &name[sizeof(name) - 1];
1745 *p = '\0';
1746
1747 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) {
1748 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum);
1749 return (EIO);
1750 }
1751 ds = (dsl_dataset_phys_t *)&dataset.dn_bonus;
1752 dir_obj = ds->ds_dir_obj;
1753
1754 for (;;) {
1755 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir) != 0)
1756 return (EIO);
1757 dd = (dsl_dir_phys_t *)&dir.dn_bonus;
1758
1759 /* Actual loop condition. */
1760 parent_obj = dd->dd_parent_obj;
1761 if (parent_obj == 0)
1762 break;
1763
1764 if (objset_get_dnode(spa, &spa->spa_mos, parent_obj, &parent) != 0)
1765 return (EIO);
1766 dd = (dsl_dir_phys_t *)&parent.dn_bonus;
1767 child_dir_zapobj = dd->dd_child_dir_zapobj;
1768 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0)
1769 return (EIO);
1770 if (zap_rlookup(spa, &child_dir_zap, component, dir_obj) != 0)
1771 return (EIO);
1772
1773 len = strlen(component);
1774 p -= len;
1775 memcpy(p, component, len);
1776 --p;
1777 *p = '/';
1778
1779 /* Actual loop iteration. */
1780 dir_obj = parent_obj;
1781 }
1782
1783 if (*p != '\0')
1784 ++p;
1785 strcpy(result, p);
1786
1787 return (0);
1788 }
1789
1790 static int
zfs_lookup_dataset(const spa_t * spa,const char * name,uint64_t * objnum)1791 zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum)
1792 {
1793 char element[256];
1794 uint64_t dir_obj, child_dir_zapobj;
1795 dnode_phys_t child_dir_zap, dir;
1796 dsl_dir_phys_t *dd;
1797 const char *p, *q;
1798
1799 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir))
1800 return (EIO);
1801 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &dir_obj))
1802 return (EIO);
1803
1804 p = name;
1805 for (;;) {
1806 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir))
1807 return (EIO);
1808 dd = (dsl_dir_phys_t *)&dir.dn_bonus;
1809
1810 while (*p == '/')
1811 p++;
1812 /* Actual loop condition #1. */
1813 if (*p == '\0')
1814 break;
1815
1816 q = strchr(p, '/');
1817 if (q) {
1818 memcpy(element, p, q - p);
1819 element[q - p] = '\0';
1820 p = q + 1;
1821 } else {
1822 strcpy(element, p);
1823 p += strlen(p);
1824 }
1825
1826 child_dir_zapobj = dd->dd_child_dir_zapobj;
1827 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0)
1828 return (EIO);
1829
1830 /* Actual loop condition #2. */
1831 if (zap_lookup(spa, &child_dir_zap, element, &dir_obj) != 0)
1832 return (ENOENT);
1833 }
1834
1835 *objnum = dd->dd_head_dataset_obj;
1836 return (0);
1837 }
1838
1839 #ifndef BOOT2
1840 static int
zfs_list_dataset(const spa_t * spa,uint64_t objnum)1841 zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/)
1842 {
1843 uint64_t dir_obj, child_dir_zapobj;
1844 dnode_phys_t child_dir_zap, dir, dataset;
1845 dsl_dataset_phys_t *ds;
1846 dsl_dir_phys_t *dd;
1847
1848 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) {
1849 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum);
1850 return (EIO);
1851 }
1852 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus;
1853 dir_obj = ds->ds_dir_obj;
1854
1855 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) {
1856 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj);
1857 return (EIO);
1858 }
1859 dd = (dsl_dir_phys_t *)&dir.dn_bonus;
1860
1861 child_dir_zapobj = dd->dd_child_dir_zapobj;
1862 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) {
1863 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj);
1864 return (EIO);
1865 }
1866
1867 return (zap_list(spa, &child_dir_zap) != 0);
1868 }
1869
1870 int
zfs_callback_dataset(const spa_t * spa,uint64_t objnum,int (* callback)(const char * name))1871 zfs_callback_dataset(const spa_t *spa, uint64_t objnum, int (*callback)(const char *name))
1872 {
1873 uint64_t dir_obj, child_dir_zapobj, zap_type;
1874 dnode_phys_t child_dir_zap, dir, dataset;
1875 dsl_dataset_phys_t *ds;
1876 dsl_dir_phys_t *dd;
1877 int err;
1878
1879 err = objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset);
1880 if (err != 0) {
1881 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum);
1882 return (err);
1883 }
1884 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus;
1885 dir_obj = ds->ds_dir_obj;
1886
1887 err = objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir);
1888 if (err != 0) {
1889 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj);
1890 return (err);
1891 }
1892 dd = (dsl_dir_phys_t *)&dir.dn_bonus;
1893
1894 child_dir_zapobj = dd->dd_child_dir_zapobj;
1895 err = objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap);
1896 if (err != 0) {
1897 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj);
1898 return (err);
1899 }
1900
1901 err = dnode_read(spa, &child_dir_zap, 0, zap_scratch, child_dir_zap.dn_datablkszsec * 512);
1902 if (err != 0)
1903 return (err);
1904
1905 zap_type = *(uint64_t *) zap_scratch;
1906 if (zap_type == ZBT_MICRO)
1907 return mzap_list(&child_dir_zap, callback);
1908 else
1909 return fzap_list(spa, &child_dir_zap, callback);
1910 }
1911 #endif
1912
1913 /*
1914 * Find the object set given the object number of its dataset object
1915 * and return its details in *objset
1916 */
1917 static int
zfs_mount_dataset(const spa_t * spa,uint64_t objnum,objset_phys_t * objset)1918 zfs_mount_dataset(const spa_t *spa, uint64_t objnum, objset_phys_t *objset)
1919 {
1920 dnode_phys_t dataset;
1921 dsl_dataset_phys_t *ds;
1922
1923 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) {
1924 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum);
1925 return (EIO);
1926 }
1927
1928 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus;
1929 if (zio_read(spa, &ds->ds_bp, objset)) {
1930 printf("ZFS: can't read object set for dataset %ju\n",
1931 (uintmax_t)objnum);
1932 return (EIO);
1933 }
1934
1935 return (0);
1936 }
1937
1938 /*
1939 * Find the object set pointed to by the BOOTFS property or the root
1940 * dataset if there is none and return its details in *objset
1941 */
1942 static int
zfs_get_root(const spa_t * spa,uint64_t * objid)1943 zfs_get_root(const spa_t *spa, uint64_t *objid)
1944 {
1945 dnode_phys_t dir, propdir;
1946 uint64_t props, bootfs, root;
1947
1948 *objid = 0;
1949
1950 /*
1951 * Start with the MOS directory object.
1952 */
1953 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) {
1954 printf("ZFS: can't read MOS object directory\n");
1955 return (EIO);
1956 }
1957
1958 /*
1959 * Lookup the pool_props and see if we can find a bootfs.
1960 */
1961 if (zap_lookup(spa, &dir, DMU_POOL_PROPS, &props) == 0
1962 && objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0
1963 && zap_lookup(spa, &propdir, "bootfs", &bootfs) == 0
1964 && bootfs != 0)
1965 {
1966 *objid = bootfs;
1967 return (0);
1968 }
1969 /*
1970 * Lookup the root dataset directory
1971 */
1972 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &root)
1973 || objset_get_dnode(spa, &spa->spa_mos, root, &dir)) {
1974 printf("ZFS: can't find root dsl_dir\n");
1975 return (EIO);
1976 }
1977
1978 /*
1979 * Use the information from the dataset directory's bonus buffer
1980 * to find the dataset object and from that the object set itself.
1981 */
1982 dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus;
1983 *objid = dd->dd_head_dataset_obj;
1984 return (0);
1985 }
1986
1987 static int
zfs_mount(const spa_t * spa,uint64_t rootobj,struct zfsmount * mount)1988 zfs_mount(const spa_t *spa, uint64_t rootobj, struct zfsmount *mount)
1989 {
1990
1991 mount->spa = spa;
1992
1993 /*
1994 * Find the root object set if not explicitly provided
1995 */
1996 if (rootobj == 0 && zfs_get_root(spa, &rootobj)) {
1997 printf("ZFS: can't find root filesystem\n");
1998 return (EIO);
1999 }
2000
2001 if (zfs_mount_dataset(spa, rootobj, &mount->objset)) {
2002 printf("ZFS: can't open root filesystem\n");
2003 return (EIO);
2004 }
2005
2006 mount->rootobj = rootobj;
2007
2008 return (0);
2009 }
2010
2011 static int
zfs_spa_init(spa_t * spa)2012 zfs_spa_init(spa_t *spa)
2013 {
2014
2015 if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) {
2016 printf("ZFS: can't read MOS of pool %s\n", spa->spa_name);
2017 return (EIO);
2018 }
2019 if (spa->spa_mos.os_type != DMU_OST_META) {
2020 printf("ZFS: corrupted MOS of pool %s\n", spa->spa_name);
2021 return (EIO);
2022 }
2023 return (0);
2024 }
2025
2026 static int
zfs_dnode_stat(const spa_t * spa,dnode_phys_t * dn,struct stat * sb)2027 zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb)
2028 {
2029
2030 if (dn->dn_bonustype != DMU_OT_SA) {
2031 znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus;
2032
2033 sb->st_mode = zp->zp_mode;
2034 sb->st_uid = zp->zp_uid;
2035 sb->st_gid = zp->zp_gid;
2036 sb->st_size = zp->zp_size;
2037 } else {
2038 sa_hdr_phys_t *sahdrp;
2039 int hdrsize;
2040 size_t size = 0;
2041 void *buf = NULL;
2042
2043 if (dn->dn_bonuslen != 0)
2044 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn);
2045 else {
2046 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) {
2047 blkptr_t *bp = &dn->dn_spill;
2048 int error;
2049
2050 size = BP_GET_LSIZE(bp);
2051 buf = zfs_alloc(size);
2052 error = zio_read(spa, bp, buf);
2053 if (error != 0) {
2054 zfs_free(buf, size);
2055 return (error);
2056 }
2057 sahdrp = buf;
2058 } else {
2059 return (EIO);
2060 }
2061 }
2062 hdrsize = SA_HDR_SIZE(sahdrp);
2063 sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize +
2064 SA_MODE_OFFSET);
2065 sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize +
2066 SA_UID_OFFSET);
2067 sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize +
2068 SA_GID_OFFSET);
2069 sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize +
2070 SA_SIZE_OFFSET);
2071 if (buf != NULL)
2072 zfs_free(buf, size);
2073 }
2074
2075 return (0);
2076 }
2077
2078 /*
2079 * Lookup a file and return its dnode.
2080 */
2081 static int
zfs_lookup(const struct zfsmount * mount,const char * upath,dnode_phys_t * dnode)2082 zfs_lookup(const struct zfsmount *mount, const char *upath, dnode_phys_t *dnode)
2083 {
2084 int rc;
2085 uint64_t objnum, rootnum, parentnum;
2086 const spa_t *spa;
2087 dnode_phys_t dn;
2088 const char *p, *q;
2089 char element[256];
2090 char path[1024];
2091 int symlinks_followed = 0;
2092 struct stat sb;
2093
2094 spa = mount->spa;
2095 if (mount->objset.os_type != DMU_OST_ZFS) {
2096 printf("ZFS: unexpected object set type %ju\n",
2097 (uintmax_t)mount->objset.os_type);
2098 return (EIO);
2099 }
2100
2101 /*
2102 * Get the root directory dnode.
2103 */
2104 rc = objset_get_dnode(spa, &mount->objset, MASTER_NODE_OBJ, &dn);
2105 if (rc)
2106 return (rc);
2107
2108 rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, &rootnum);
2109 if (rc)
2110 return (rc);
2111
2112 rc = objset_get_dnode(spa, &mount->objset, rootnum, &dn);
2113 if (rc)
2114 return (rc);
2115
2116 objnum = rootnum;
2117 p = upath;
2118 while (p && *p) {
2119 while (*p == '/')
2120 p++;
2121 if (!*p)
2122 break;
2123 q = strchr(p, '/');
2124 if (q) {
2125 memcpy(element, p, q - p);
2126 element[q - p] = 0;
2127 p = q;
2128 } else {
2129 strcpy(element, p);
2130 p = 0;
2131 }
2132
2133 rc = zfs_dnode_stat(spa, &dn, &sb);
2134 if (rc)
2135 return (rc);
2136 if (!S_ISDIR(sb.st_mode))
2137 return (ENOTDIR);
2138
2139 parentnum = objnum;
2140 rc = zap_lookup(spa, &dn, element, &objnum);
2141 if (rc)
2142 return (rc);
2143 objnum = ZFS_DIRENT_OBJ(objnum);
2144
2145 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn);
2146 if (rc)
2147 return (rc);
2148
2149 /*
2150 * Check for symlink.
2151 */
2152 rc = zfs_dnode_stat(spa, &dn, &sb);
2153 if (rc)
2154 return (rc);
2155 if (S_ISLNK(sb.st_mode)) {
2156 if (symlinks_followed > 10)
2157 return (EMLINK);
2158 symlinks_followed++;
2159
2160 /*
2161 * Read the link value and copy the tail of our
2162 * current path onto the end.
2163 */
2164 if (p)
2165 strcpy(&path[sb.st_size], p);
2166 else
2167 path[sb.st_size] = 0;
2168 if (sb.st_size + sizeof(znode_phys_t) <= dn.dn_bonuslen) {
2169 memcpy(path, &dn.dn_bonus[sizeof(znode_phys_t)],
2170 sb.st_size);
2171 } else {
2172 rc = dnode_read(spa, &dn, 0, path, sb.st_size);
2173 if (rc)
2174 return (rc);
2175 }
2176
2177 /*
2178 * Restart with the new path, starting either at
2179 * the root or at the parent depending whether or
2180 * not the link is relative.
2181 */
2182 p = path;
2183 if (*p == '/')
2184 objnum = rootnum;
2185 else
2186 objnum = parentnum;
2187 objset_get_dnode(spa, &mount->objset, objnum, &dn);
2188 }
2189 }
2190
2191 *dnode = dn;
2192 return (0);
2193 }
2194