author | vikram |
Mon, 14 Apr 2008 21:21:40 -0700 | |
changeset 6449 | 9715e41771e2 |
parent 6448 | dfd58b2129f6 |
child 6659 | 77371f47272b |
permissions | -rw-r--r-- |
3912 | 1 |
/* |
2 |
* GRUB -- GRand Unified Bootloader |
|
3 |
* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. |
|
4 |
* |
|
5 |
* This program is free software; you can redistribute it and/or modify |
|
6 |
* it under the terms of the GNU General Public License as published by |
|
7 |
* the Free Software Foundation; either version 2 of the License, or |
|
8 |
* (at your option) any later version. |
|
9 |
* |
|
10 |
* This program is distributed in the hope that it will be useful, |
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
13 |
* GNU General Public License for more details. |
|
14 |
* |
|
15 |
* You should have received a copy of the GNU General Public License |
|
16 |
* along with this program; if not, write to the Free Software |
|
17 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
|
18 |
*/ |
|
19 |
/* |
|
6423 | 20 |
* Copyright 2008 Sun Microsystems, Inc. All rights reserved. |
3912 | 21 |
* Use is subject to license terms. |
22 |
*/ |
|
23 |
#pragma ident "%Z%%M% %I% %E% SMI" |
|
24 |
||
25 |
/* |
|
26 |
* The zfs plug-in routines for GRUB are: |
|
27 |
* |
|
28 |
* zfs_mount() - locates a valid uberblock of the root pool and reads |
|
29 |
* in its MOS at the memory address MOS. |
|
30 |
* |
|
31 |
* zfs_open() - locates a plain file object by following the MOS |
|
32 |
* and places its dnode at the memory address DNODE. |
|
33 |
* |
|
34 |
* zfs_read() - read in the data blocks pointed by the DNODE. |
|
35 |
* |
|
36 |
* ZFS_SCRATCH is used as a working area. |
|
37 |
* |
|
38 |
* (memory addr) MOS DNODE ZFS_SCRATCH |
|
39 |
* | | | |
|
40 |
* +-------V---------V----------V---------------+ |
|
41 |
* memory | | dnode | dnode | scratch | |
|
42 |
* | | 512B | 512B | area | |
|
43 |
* +--------------------------------------------+ |
|
44 |
*/ |
|
45 |
||
46 |
#ifdef FSYS_ZFS |
|
47 |
||
48 |
#include "shared.h" |
|
49 |
#include "filesys.h" |
|
50 |
#include "fsys_zfs.h" |
|
51 |
||
52 |
/* cache for a file block of the currently zfs_open()-ed file */ |
|
53 |
static void *file_buf = NULL; |
|
54 |
static uint64_t file_start = 0; |
|
55 |
static uint64_t file_end = 0; |
|
56 |
||
57 |
/* cache for a dnode block */ |
|
58 |
static dnode_phys_t *dnode_buf = NULL; |
|
59 |
static dnode_phys_t *dnode_mdn = NULL; |
|
60 |
static uint64_t dnode_start = 0; |
|
61 |
static uint64_t dnode_end = 0; |
|
62 |
||
63 |
static char *stackbase; |
|
64 |
||
65 |
decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = |
|
66 |
{ |
|
67 |
{"noop", 0}, |
|
68 |
{"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */ |
|
69 |
{"off", 0}, |
|
70 |
{"lzjb", lzjb_decompress} /* ZIO_COMPRESS_LZJB */ |
|
71 |
}; |
|
72 |
||
73 |
/* |
|
74 |
* Our own version of bcmp(). |
|
75 |
*/ |
|
76 |
static int |
|
77 |
zfs_bcmp(const void *s1, const void *s2, size_t n) |
|
78 |
{ |
|
79 |
const uchar_t *ps1 = s1; |
|
80 |
const uchar_t *ps2 = s2; |
|
81 |
||
82 |
if (s1 != s2 && n != 0) { |
|
83 |
do { |
|
84 |
if (*ps1++ != *ps2++) |
|
85 |
return (1); |
|
86 |
} while (--n != 0); |
|
87 |
} |
|
88 |
||
89 |
return (0); |
|
90 |
} |
|
91 |
||
92 |
/* |
|
93 |
* Our own version of log2(). Same thing as highbit()-1. |
|
94 |
*/ |
|
95 |
static int |
|
96 |
zfs_log2(uint64_t num) |
|
97 |
{ |
|
98 |
int i = 0; |
|
99 |
||
100 |
while (num > 1) { |
|
101 |
i++; |
|
102 |
num = num >> 1; |
|
103 |
} |
|
104 |
||
105 |
return (i); |
|
106 |
} |
|
107 |
||
108 |
/* Checksum Functions */ |
|
109 |
static void |
|
110 |
zio_checksum_off(const void *buf, uint64_t size, zio_cksum_t *zcp) |
|
111 |
{ |
|
112 |
ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0); |
|
113 |
} |
|
114 |
||
115 |
/* Checksum Table and Values */ |
|
116 |
zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = { |
|
117 |
NULL, NULL, 0, 0, "inherit", |
|
118 |
NULL, NULL, 0, 0, "on", |
|
119 |
zio_checksum_off, zio_checksum_off, 0, 0, "off", |
|
120 |
zio_checksum_SHA256, zio_checksum_SHA256, 1, 1, "label", |
|
121 |
zio_checksum_SHA256, zio_checksum_SHA256, 1, 1, "gang_header", |
|
122 |
fletcher_2_native, fletcher_2_byteswap, 0, 1, "zilog", |
|
123 |
fletcher_2_native, fletcher_2_byteswap, 0, 0, "fletcher2", |
|
124 |
fletcher_4_native, fletcher_4_byteswap, 1, 0, "fletcher4", |
|
125 |
zio_checksum_SHA256, zio_checksum_SHA256, 1, 0, "SHA256", |
|
126 |
}; |
|
127 |
||
128 |
/* |
|
129 |
* zio_checksum_verify: Provides support for checksum verification. |
|
130 |
* |
|
131 |
* Fletcher2, Fletcher4, and SHA256 are supported. |
|
132 |
* |
|
133 |
* Return: |
|
134 |
* -1 = Failure |
|
135 |
* 0 = Success |
|
136 |
*/ |
|
137 |
static int |
|
138 |
zio_checksum_verify(blkptr_t *bp, char *data, int size) |
|
139 |
{ |
|
140 |
zio_cksum_t zc = bp->blk_cksum; |
|
141 |
uint32_t checksum = BP_IS_GANG(bp) ? ZIO_CHECKSUM_GANG_HEADER : |
|
142 |
BP_GET_CHECKSUM(bp); |
|
143 |
int byteswap = BP_SHOULD_BYTESWAP(bp); |
|
144 |
zio_block_tail_t *zbt = (zio_block_tail_t *)(data + size) - 1; |
|
145 |
zio_checksum_info_t *ci = &zio_checksum_table[checksum]; |
|
146 |
zio_cksum_t actual_cksum, expected_cksum; |
|
147 |
||
148 |
/* byteswap is not supported */ |
|
149 |
if (byteswap) |
|
150 |
return (-1); |
|
151 |
||
152 |
if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL) |
|
153 |
return (-1); |
|
154 |
||
155 |
if (ci->ci_zbt) { |
|
156 |
if (checksum == ZIO_CHECKSUM_GANG_HEADER) { |
|
157 |
/* |
|
158 |
* 'gang blocks' is not supported. |
|
159 |
*/ |
|
160 |
return (-1); |
|
161 |
} |
|
162 |
||
163 |
if (zbt->zbt_magic == BSWAP_64(ZBT_MAGIC)) { |
|
164 |
/* byte swapping is not supported */ |
|
165 |
return (-1); |
|
166 |
} else { |
|
167 |
expected_cksum = zbt->zbt_cksum; |
|
168 |
zbt->zbt_cksum = zc; |
|
169 |
ci->ci_func[0](data, size, &actual_cksum); |
|
170 |
zbt->zbt_cksum = expected_cksum; |
|
171 |
} |
|
172 |
zc = expected_cksum; |
|
173 |
||
174 |
} else { |
|
175 |
if (BP_IS_GANG(bp)) |
|
176 |
return (-1); |
|
177 |
ci->ci_func[byteswap](data, size, &actual_cksum); |
|
178 |
} |
|
179 |
||
180 |
if ((actual_cksum.zc_word[0] - zc.zc_word[0]) | |
|
181 |
(actual_cksum.zc_word[1] - zc.zc_word[1]) | |
|
182 |
(actual_cksum.zc_word[2] - zc.zc_word[2]) | |
|
183 |
(actual_cksum.zc_word[3] - zc.zc_word[3])) |
|
184 |
return (-1); |
|
185 |
||
186 |
return (0); |
|
187 |
} |
|
188 |
||
189 |
/* |
|
190 |
* vdev_label_offset takes "offset" (the offset within a vdev_label) and |
|
191 |
* returns its physical disk offset (starting from the beginning of the vdev). |
|
192 |
* |
|
193 |
* Input: |
|
194 |
* psize : Physical size of this vdev |
|
195 |
* l : Label Number (0-3) |
|
196 |
* offset : The offset with a vdev_label in which we want the physical |
|
197 |
* address |
|
198 |
* Return: |
|
199 |
* Success : physical disk offset |
|
200 |
* Failure : errnum = ERR_BAD_ARGUMENT, return value is meaningless |
|
201 |
*/ |
|
6423 | 202 |
static uint64_t |
3912 | 203 |
vdev_label_offset(uint64_t psize, int l, uint64_t offset) |
204 |
{ |
|
205 |
/* XXX Need to add back label support! */ |
|
206 |
if (l >= VDEV_LABELS/2 || offset > sizeof (vdev_label_t)) { |
|
207 |
errnum = ERR_BAD_ARGUMENT; |
|
208 |
return (0); |
|
209 |
} |
|
210 |
||
211 |
return (offset + l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? |
|
212 |
0 : psize - VDEV_LABELS * sizeof (vdev_label_t))); |
|
213 |
||
214 |
} |
|
215 |
||
216 |
/* |
|
217 |
* vdev_uberblock_compare takes two uberblock structures and returns an integer |
|
218 |
* indicating the more recent of the two. |
|
219 |
* Return Value = 1 if ub2 is more recent |
|
220 |
* Return Value = -1 if ub1 is more recent |
|
221 |
* The most recent uberblock is determined using its transaction number and |
|
222 |
* timestamp. The uberblock with the highest transaction number is |
|
223 |
* considered "newer". If the transaction numbers of the two blocks match, the |
|
224 |
* timestamps are compared to determine the "newer" of the two. |
|
225 |
*/ |
|
226 |
static int |
|
227 |
vdev_uberblock_compare(uberblock_t *ub1, uberblock_t *ub2) |
|
228 |
{ |
|
229 |
if (ub1->ub_txg < ub2->ub_txg) |
|
230 |
return (-1); |
|
231 |
if (ub1->ub_txg > ub2->ub_txg) |
|
232 |
return (1); |
|
233 |
||
234 |
if (ub1->ub_timestamp < ub2->ub_timestamp) |
|
235 |
return (-1); |
|
236 |
if (ub1->ub_timestamp > ub2->ub_timestamp) |
|
237 |
return (1); |
|
238 |
||
239 |
return (0); |
|
240 |
} |
|
241 |
||
242 |
/* |
|
243 |
* Three pieces of information are needed to verify an uberblock: the magic |
|
244 |
* number, the version number, and the checksum. |
|
245 |
* |
|
246 |
* Currently Implemented: version number, magic number |
|
247 |
* Need to Implement: checksum |
|
248 |
* |
|
249 |
* Return: |
|
250 |
* 0 - Success |
|
251 |
* -1 - Failure |
|
252 |
*/ |
|
253 |
static int |
|
254 |
uberblock_verify(uberblock_phys_t *ub, int offset) |
|
255 |
{ |
|
256 |
||
257 |
uberblock_t *uber = &ub->ubp_uberblock; |
|
258 |
blkptr_t bp; |
|
259 |
||
260 |
BP_ZERO(&bp); |
|
261 |
BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); |
|
262 |
BP_SET_BYTEORDER(&bp, ZFS_HOST_BYTEORDER); |
|
263 |
ZIO_SET_CHECKSUM(&bp.blk_cksum, offset, 0, 0, 0); |
|
264 |
||
265 |
if (zio_checksum_verify(&bp, (char *)ub, UBERBLOCK_SIZE) != 0) |
|
266 |
return (-1); |
|
267 |
||
268 |
if (uber->ub_magic == UBERBLOCK_MAGIC && |
|
4577 | 269 |
uber->ub_version >= SPA_VERSION_1 && |
270 |
uber->ub_version <= SPA_VERSION) |
|
3912 | 271 |
return (0); |
272 |
||
273 |
return (-1); |
|
274 |
} |
|
275 |
||
276 |
/* |
|
277 |
* Find the best uberblock. |
|
278 |
* Return: |
|
279 |
* Success - Pointer to the best uberblock. |
|
280 |
* Failure - NULL |
|
281 |
*/ |
|
282 |
static uberblock_phys_t * |
|
283 |
find_bestub(uberblock_phys_t *ub_array, int label) |
|
284 |
{ |
|
285 |
uberblock_phys_t *ubbest = NULL; |
|
286 |
int i, offset; |
|
287 |
||
288 |
for (i = 0; i < (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT); i++) { |
|
289 |
offset = vdev_label_offset(0, label, VDEV_UBERBLOCK_OFFSET(i)); |
|
290 |
if (errnum == ERR_BAD_ARGUMENT) |
|
291 |
return (NULL); |
|
292 |
if (uberblock_verify(&ub_array[i], offset) == 0) { |
|
293 |
if (ubbest == NULL) { |
|
294 |
ubbest = &ub_array[i]; |
|
4577 | 295 |
} else if (vdev_uberblock_compare( |
296 |
&(ub_array[i].ubp_uberblock), |
|
297 |
&(ubbest->ubp_uberblock)) > 0) { |
|
298 |
ubbest = &ub_array[i]; |
|
3912 | 299 |
} |
300 |
} |
|
301 |
} |
|
302 |
||
303 |
return (ubbest); |
|
304 |
} |
|
305 |
||
306 |
/* |
|
307 |
* Read in a block and put its uncompressed data in buf. |
|
308 |
* |
|
309 |
* Return: |
|
310 |
* 0 - success |
|
311 |
* errnum - failure |
|
312 |
*/ |
|
313 |
static int |
|
314 |
zio_read(blkptr_t *bp, void *buf, char *stack) |
|
315 |
{ |
|
316 |
uint64_t offset, sector; |
|
317 |
int psize, lsize; |
|
318 |
int i, comp, cksum; |
|
319 |
||
320 |
psize = BP_GET_PSIZE(bp); |
|
321 |
lsize = BP_GET_LSIZE(bp); |
|
322 |
comp = BP_GET_COMPRESS(bp); |
|
323 |
cksum = BP_GET_CHECKSUM(bp); |
|
324 |
||
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
325 |
if ((unsigned int)comp >= ZIO_COMPRESS_FUNCTIONS || |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
326 |
comp != ZIO_COMPRESS_OFF && decomp_table[comp].decomp_func == NULL) |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
327 |
return (ERR_FSYS_CORRUPT); |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
328 |
|
3912 | 329 |
/* pick a good dva from the block pointer */ |
330 |
for (i = 0; i < SPA_DVAS_PER_BP; i++) { |
|
331 |
||
332 |
if (bp->blk_dva[i].dva_word[0] == 0 && |
|
333 |
bp->blk_dva[i].dva_word[1] == 0) |
|
334 |
continue; |
|
335 |
||
336 |
/* read in a block */ |
|
337 |
offset = DVA_GET_OFFSET(&bp->blk_dva[i]); |
|
338 |
sector = DVA_OFFSET_TO_PHYS_SECTOR(offset); |
|
339 |
||
340 |
if (comp != ZIO_COMPRESS_OFF) { |
|
341 |
||
342 |
if (devread(sector, 0, psize, stack) == 0) |
|
343 |
continue; |
|
344 |
if (zio_checksum_verify(bp, stack, psize) != 0) |
|
345 |
continue; |
|
346 |
decomp_table[comp].decomp_func(stack, buf, psize, |
|
347 |
lsize); |
|
348 |
} else { |
|
349 |
if (devread(sector, 0, psize, buf) == 0) |
|
350 |
continue; |
|
351 |
if (zio_checksum_verify(bp, buf, psize) != 0) |
|
352 |
continue; |
|
353 |
} |
|
354 |
return (0); |
|
355 |
} |
|
356 |
||
357 |
return (ERR_FSYS_CORRUPT); |
|
358 |
} |
|
359 |
||
360 |
/* |
|
361 |
* Get the block from a block id. |
|
362 |
* push the block onto the stack. |
|
363 |
* |
|
364 |
* Return: |
|
365 |
* 0 - success |
|
366 |
* errnum - failure |
|
367 |
*/ |
|
368 |
static int |
|
369 |
dmu_read(dnode_phys_t *dn, uint64_t blkid, void *buf, char *stack) |
|
370 |
{ |
|
371 |
int idx, level; |
|
372 |
blkptr_t *bp_array = dn->dn_blkptr; |
|
373 |
int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; |
|
374 |
blkptr_t *bp, *tmpbuf; |
|
375 |
||
376 |
bp = (blkptr_t *)stack; |
|
377 |
stack += sizeof (blkptr_t); |
|
378 |
||
379 |
tmpbuf = (blkptr_t *)stack; |
|
380 |
stack += 1<<dn->dn_indblkshift; |
|
381 |
||
382 |
for (level = dn->dn_nlevels - 1; level >= 0; level--) { |
|
383 |
idx = (blkid >> (epbs * level)) & ((1<<epbs)-1); |
|
384 |
*bp = bp_array[idx]; |
|
385 |
if (level == 0) |
|
386 |
tmpbuf = buf; |
|
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
387 |
if (BP_IS_HOLE(bp)) { |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
388 |
grub_memset(buf, 0, |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
389 |
dn->dn_datablkszsec << SPA_MINBLOCKSHIFT); |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
390 |
break; |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
391 |
} else if (errnum = zio_read(bp, tmpbuf, stack)) { |
3912 | 392 |
return (errnum); |
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
393 |
} |
3912 | 394 |
|
395 |
bp_array = tmpbuf; |
|
396 |
} |
|
397 |
||
398 |
return (0); |
|
399 |
} |
|
400 |
||
401 |
/* |
|
402 |
* mzap_lookup: Looks up property described by "name" and returns the value |
|
403 |
* in "value". |
|
404 |
* |
|
405 |
* Return: |
|
406 |
* 0 - success |
|
407 |
* errnum - failure |
|
408 |
*/ |
|
409 |
static int |
|
410 |
mzap_lookup(mzap_phys_t *zapobj, int objsize, char *name, |
|
411 |
uint64_t *value) |
|
412 |
{ |
|
413 |
int i, chunks; |
|
414 |
mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk; |
|
415 |
||
416 |
chunks = objsize/MZAP_ENT_LEN - 1; |
|
417 |
for (i = 0; i < chunks; i++) { |
|
418 |
if (grub_strcmp(mzap_ent[i].mze_name, name) == 0) { |
|
419 |
*value = mzap_ent[i].mze_value; |
|
420 |
return (0); |
|
421 |
} |
|
422 |
} |
|
423 |
||
424 |
return (ERR_FSYS_CORRUPT); |
|
425 |
} |
|
426 |
||
427 |
static uint64_t |
|
428 |
zap_hash(uint64_t salt, const char *name) |
|
429 |
{ |
|
430 |
static uint64_t table[256]; |
|
431 |
const uint8_t *cp; |
|
432 |
uint8_t c; |
|
433 |
uint64_t crc = salt; |
|
434 |
||
435 |
if (table[128] == 0) { |
|
436 |
uint64_t *ct; |
|
437 |
int i, j; |
|
438 |
for (i = 0; i < 256; i++) { |
|
439 |
for (ct = table + i, *ct = i, j = 8; j > 0; j--) |
|
440 |
*ct = (*ct >> 1) ^ (-(*ct & 1) & |
|
441 |
ZFS_CRC64_POLY); |
|
442 |
} |
|
443 |
} |
|
444 |
||
445 |
if (crc == 0 || table[128] != ZFS_CRC64_POLY) { |
|
446 |
errnum = ERR_FSYS_CORRUPT; |
|
447 |
return (0); |
|
448 |
} |
|
449 |
||
450 |
for (cp = (const uint8_t *)name; (c = *cp) != '\0'; cp++) |
|
451 |
crc = (crc >> 8) ^ table[(crc ^ c) & 0xFF]; |
|
452 |
||
453 |
/* |
|
454 |
* Only use 28 bits, since we need 4 bits in the cookie for the |
|
455 |
* collision differentiator. We MUST use the high bits, since |
|
456 |
* those are the onces that we first pay attention to when |
|
457 |
* chosing the bucket. |
|
458 |
*/ |
|
459 |
crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1); |
|
460 |
||
461 |
return (crc); |
|
462 |
} |
|
463 |
||
464 |
/* |
|
465 |
* Only to be used on 8-bit arrays. |
|
466 |
* array_len is actual len in bytes (not encoded le_value_length). |
|
467 |
* buf is null-terminated. |
|
468 |
*/ |
|
469 |
static int |
|
470 |
zap_leaf_array_equal(zap_leaf_phys_t *l, int blksft, int chunk, |
|
471 |
int array_len, const char *buf) |
|
472 |
{ |
|
473 |
int bseen = 0; |
|
474 |
||
475 |
while (bseen < array_len) { |
|
476 |
struct zap_leaf_array *la = |
|
477 |
&ZAP_LEAF_CHUNK(l, blksft, chunk).l_array; |
|
478 |
int toread = MIN(array_len - bseen, ZAP_LEAF_ARRAY_BYTES); |
|
479 |
||
480 |
if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) |
|
481 |
return (0); |
|
482 |
||
483 |
if (zfs_bcmp(la->la_array, buf + bseen, toread) != 0) |
|
484 |
break; |
|
485 |
chunk = la->la_next; |
|
486 |
bseen += toread; |
|
487 |
} |
|
488 |
return (bseen == array_len); |
|
489 |
} |
|
490 |
||
491 |
/* |
|
492 |
* Given a zap_leaf_phys_t, walk thru the zap leaf chunks to get the |
|
493 |
* value for the property "name". |
|
494 |
* |
|
495 |
* Return: |
|
496 |
* 0 - success |
|
497 |
* errnum - failure |
|
498 |
*/ |
|
6423 | 499 |
static int |
3912 | 500 |
zap_leaf_lookup(zap_leaf_phys_t *l, int blksft, uint64_t h, |
501 |
const char *name, uint64_t *value) |
|
502 |
{ |
|
503 |
uint16_t chunk; |
|
504 |
struct zap_leaf_entry *le; |
|
505 |
||
506 |
/* Verify if this is a valid leaf block */ |
|
507 |
if (l->l_hdr.lh_block_type != ZBT_LEAF) |
|
508 |
return (ERR_FSYS_CORRUPT); |
|
509 |
if (l->l_hdr.lh_magic != ZAP_LEAF_MAGIC) |
|
510 |
return (ERR_FSYS_CORRUPT); |
|
511 |
||
512 |
for (chunk = l->l_hash[LEAF_HASH(blksft, h)]; |
|
513 |
chunk != CHAIN_END; chunk = le->le_next) { |
|
514 |
||
515 |
if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) |
|
516 |
return (ERR_FSYS_CORRUPT); |
|
517 |
||
518 |
le = ZAP_LEAF_ENTRY(l, blksft, chunk); |
|
519 |
||
520 |
/* Verify the chunk entry */ |
|
521 |
if (le->le_type != ZAP_CHUNK_ENTRY) |
|
522 |
return (ERR_FSYS_CORRUPT); |
|
523 |
||
524 |
if (le->le_hash != h) |
|
525 |
continue; |
|
526 |
||
527 |
if (zap_leaf_array_equal(l, blksft, le->le_name_chunk, |
|
528 |
le->le_name_length, name)) { |
|
529 |
||
530 |
struct zap_leaf_array *la; |
|
531 |
uint8_t *ip; |
|
532 |
||
533 |
if (le->le_int_size != 8 || le->le_value_length != 1) |
|
534 |
return (ERR_FSYS_CORRUPT); |
|
535 |
||
536 |
/* get the uint64_t property value */ |
|
537 |
la = &ZAP_LEAF_CHUNK(l, blksft, |
|
538 |
le->le_value_chunk).l_array; |
|
539 |
ip = la->la_array; |
|
540 |
||
541 |
*value = (uint64_t)ip[0] << 56 | (uint64_t)ip[1] << 48 | |
|
542 |
(uint64_t)ip[2] << 40 | (uint64_t)ip[3] << 32 | |
|
543 |
(uint64_t)ip[4] << 24 | (uint64_t)ip[5] << 16 | |
|
544 |
(uint64_t)ip[6] << 8 | (uint64_t)ip[7]; |
|
545 |
||
546 |
return (0); |
|
547 |
} |
|
548 |
} |
|
549 |
||
550 |
return (ERR_FSYS_CORRUPT); |
|
551 |
} |
|
552 |
||
553 |
/* |
|
554 |
* Fat ZAP lookup |
|
555 |
* |
|
556 |
* Return: |
|
557 |
* 0 - success |
|
558 |
* errnum - failure |
|
559 |
*/ |
|
6423 | 560 |
static int |
3912 | 561 |
fzap_lookup(dnode_phys_t *zap_dnode, zap_phys_t *zap, |
562 |
char *name, uint64_t *value, char *stack) |
|
563 |
{ |
|
564 |
zap_leaf_phys_t *l; |
|
565 |
uint64_t hash, idx, blkid; |
|
566 |
int blksft = zfs_log2(zap_dnode->dn_datablkszsec << DNODE_SHIFT); |
|
567 |
||
568 |
/* Verify if this is a fat zap header block */ |
|
569 |
if (zap->zap_magic != (uint64_t)ZAP_MAGIC) |
|
570 |
return (ERR_FSYS_CORRUPT); |
|
571 |
||
572 |
hash = zap_hash(zap->zap_salt, name); |
|
573 |
if (errnum) |
|
574 |
return (errnum); |
|
575 |
||
576 |
/* get block id from index */ |
|
577 |
if (zap->zap_ptrtbl.zt_numblks != 0) { |
|
578 |
/* external pointer tables not supported */ |
|
579 |
return (ERR_FSYS_CORRUPT); |
|
580 |
} |
|
581 |
idx = ZAP_HASH_IDX(hash, zap->zap_ptrtbl.zt_shift); |
|
582 |
blkid = ((uint64_t *)zap)[idx + (1<<(blksft-3-1))]; |
|
583 |
||
584 |
/* Get the leaf block */ |
|
585 |
l = (zap_leaf_phys_t *)stack; |
|
586 |
stack += 1<<blksft; |
|
587 |
if (errnum = dmu_read(zap_dnode, blkid, l, stack)) |
|
588 |
return (errnum); |
|
589 |
||
590 |
return (zap_leaf_lookup(l, blksft, hash, name, value)); |
|
591 |
} |
|
592 |
||
593 |
/* |
|
594 |
* Read in the data of a zap object and find the value for a matching |
|
595 |
* property name. |
|
596 |
* |
|
597 |
* Return: |
|
598 |
* 0 - success |
|
599 |
* errnum - failure |
|
600 |
*/ |
|
601 |
static int |
|
602 |
zap_lookup(dnode_phys_t *zap_dnode, char *name, uint64_t *val, char *stack) |
|
603 |
{ |
|
604 |
uint64_t block_type; |
|
605 |
int size; |
|
606 |
void *zapbuf; |
|
607 |
||
608 |
/* Read in the first block of the zap object data. */ |
|
609 |
zapbuf = stack; |
|
610 |
size = zap_dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; |
|
611 |
stack += size; |
|
612 |
if (errnum = dmu_read(zap_dnode, 0, zapbuf, stack)) |
|
613 |
return (errnum); |
|
614 |
||
615 |
block_type = *((uint64_t *)zapbuf); |
|
616 |
||
617 |
if (block_type == ZBT_MICRO) { |
|
618 |
return (mzap_lookup(zapbuf, size, name, val)); |
|
619 |
} else if (block_type == ZBT_HEADER) { |
|
620 |
/* this is a fat zap */ |
|
621 |
return (fzap_lookup(zap_dnode, zapbuf, name, |
|
622 |
val, stack)); |
|
623 |
} |
|
624 |
||
625 |
return (ERR_FSYS_CORRUPT); |
|
626 |
} |
|
627 |
||
628 |
/* |
|
629 |
* Get the dnode of an object number from the metadnode of an object set. |
|
630 |
* |
|
631 |
* Input |
|
632 |
* mdn - metadnode to get the object dnode |
|
633 |
* objnum - object number for the object dnode |
|
634 |
* buf - data buffer that holds the returning dnode |
|
635 |
* stack - scratch area |
|
636 |
* |
|
637 |
* Return: |
|
638 |
* 0 - success |
|
639 |
* errnum - failure |
|
640 |
*/ |
|
641 |
static int |
|
642 |
dnode_get(dnode_phys_t *mdn, uint64_t objnum, uint8_t type, dnode_phys_t *buf, |
|
643 |
char *stack) |
|
644 |
{ |
|
645 |
uint64_t blkid, blksz; /* the block id this object dnode is in */ |
|
646 |
int epbs; /* shift of number of dnodes in a block */ |
|
647 |
int idx; /* index within a block */ |
|
648 |
dnode_phys_t *dnbuf; |
|
649 |
||
650 |
blksz = mdn->dn_datablkszsec << SPA_MINBLOCKSHIFT; |
|
651 |
epbs = zfs_log2(blksz) - DNODE_SHIFT; |
|
652 |
blkid = objnum >> epbs; |
|
653 |
idx = objnum & ((1<<epbs)-1); |
|
654 |
||
655 |
if (dnode_buf != NULL && dnode_mdn == mdn && |
|
656 |
objnum >= dnode_start && objnum < dnode_end) { |
|
657 |
grub_memmove(buf, &dnode_buf[idx], DNODE_SIZE); |
|
658 |
VERIFY_DN_TYPE(buf, type); |
|
659 |
return (0); |
|
660 |
} |
|
661 |
||
662 |
if (dnode_buf && blksz == 1<<DNODE_BLOCK_SHIFT) { |
|
663 |
dnbuf = dnode_buf; |
|
664 |
dnode_mdn = mdn; |
|
665 |
dnode_start = blkid << epbs; |
|
666 |
dnode_end = (blkid + 1) << epbs; |
|
667 |
} else { |
|
668 |
dnbuf = (dnode_phys_t *)stack; |
|
669 |
stack += blksz; |
|
670 |
} |
|
671 |
||
672 |
if (errnum = dmu_read(mdn, blkid, (char *)dnbuf, stack)) |
|
673 |
return (errnum); |
|
674 |
||
675 |
grub_memmove(buf, &dnbuf[idx], DNODE_SIZE); |
|
676 |
VERIFY_DN_TYPE(buf, type); |
|
677 |
||
678 |
return (0); |
|
679 |
} |
|
680 |
||
681 |
/* |
|
6448 | 682 |
* Check if this is a special file that resides at the top |
683 |
* dataset of the pool. Currently this is the GRUB menu, |
|
684 |
* boot signature and boot signature backup. |
|
3912 | 685 |
* str starts with '/'. |
686 |
*/ |
|
687 |
static int |
|
6448 | 688 |
is_top_dataset_file(char *str) |
3912 | 689 |
{ |
690 |
char *tptr; |
|
691 |
||
692 |
if ((tptr = grub_strstr(str, "menu.lst")) && |
|
693 |
(tptr[8] == '\0' || tptr[8] == ' ') && |
|
694 |
*(tptr-1) == '/') |
|
695 |
return (1); |
|
696 |
||
6448 | 697 |
if (grub_strncmp(str, BOOTSIGN_DIR"/", |
6449
9715e41771e2
6655040 need a mechanism to replace biosdev usage (fix cstyle)
vikram
parents:
6448
diff
changeset
|
698 |
grub_strlen(BOOTSIGN_DIR) + 1) == 0) |
6448 | 699 |
return (1); |
700 |
||
701 |
if (grub_strcmp(str, BOOTSIGN_BACKUP) == 0) |
|
702 |
return (1); |
|
703 |
||
3912 | 704 |
return (0); |
705 |
} |
|
706 |
||
707 |
/* |
|
708 |
* Get the file dnode for a given file name where mdn is the meta dnode |
|
709 |
* for this ZFS object set. When found, place the file dnode in dn. |
|
710 |
* The 'path' argument will be mangled. |
|
711 |
* |
|
712 |
* Return: |
|
713 |
* 0 - success |
|
714 |
* errnum - failure |
|
715 |
*/ |
|
716 |
static int |
|
717 |
dnode_get_path(dnode_phys_t *mdn, char *path, dnode_phys_t *dn, |
|
718 |
char *stack) |
|
719 |
{ |
|
4577 | 720 |
uint64_t objnum, version; |
3912 | 721 |
char *cname, ch; |
722 |
||
723 |
if (errnum = dnode_get(mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE, |
|
724 |
dn, stack)) |
|
725 |
return (errnum); |
|
726 |
||
4577 | 727 |
if (errnum = zap_lookup(dn, ZPL_VERSION_STR, &version, stack)) |
728 |
return (errnum); |
|
729 |
if (version > ZPL_VERSION) |
|
730 |
return (-1); |
|
731 |
||
3912 | 732 |
if (errnum = zap_lookup(dn, ZFS_ROOT_OBJ, &objnum, stack)) |
733 |
return (errnum); |
|
734 |
||
735 |
if (errnum = dnode_get(mdn, objnum, DMU_OT_DIRECTORY_CONTENTS, |
|
736 |
dn, stack)) |
|
737 |
return (errnum); |
|
738 |
||
739 |
/* skip leading slashes */ |
|
740 |
while (*path == '/') |
|
741 |
path++; |
|
742 |
||
743 |
while (*path && !isspace(*path)) { |
|
744 |
||
745 |
/* get the next component name */ |
|
746 |
cname = path; |
|
747 |
while (*path && !isspace(*path) && *path != '/') |
|
748 |
path++; |
|
749 |
ch = *path; |
|
750 |
*path = 0; /* ensure null termination */ |
|
751 |
||
752 |
if (errnum = zap_lookup(dn, cname, &objnum, stack)) |
|
753 |
return (errnum); |
|
754 |
||
4577 | 755 |
objnum = ZFS_DIRENT_OBJ(objnum); |
3912 | 756 |
if (errnum = dnode_get(mdn, objnum, 0, dn, stack)) |
757 |
return (errnum); |
|
758 |
||
759 |
*path = ch; |
|
760 |
while (*path == '/') |
|
761 |
path++; |
|
762 |
} |
|
763 |
||
764 |
/* We found the dnode for this file. Verify if it is a plain file. */ |
|
765 |
VERIFY_DN_TYPE(dn, DMU_OT_PLAIN_FILE_CONTENTS); |
|
766 |
||
767 |
return (0); |
|
768 |
} |
|
769 |
||
770 |
/* |
|
771 |
* Get the default 'bootfs' property value from the rootpool. |
|
772 |
* |
|
773 |
* Return: |
|
774 |
* 0 - success |
|
775 |
* errnum -failure |
|
776 |
*/ |
|
777 |
static int |
|
778 |
get_default_bootfsobj(dnode_phys_t *mosmdn, uint64_t *obj, char *stack) |
|
779 |
{ |
|
780 |
uint64_t objnum = 0; |
|
781 |
dnode_phys_t *dn = (dnode_phys_t *)stack; |
|
782 |
stack += DNODE_SIZE; |
|
783 |
||
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
784 |
if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, |
3912 | 785 |
DMU_OT_OBJECT_DIRECTORY, dn, stack)) |
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
786 |
return (errnum); |
3912 | 787 |
|
788 |
/* |
|
789 |
* find the object number for 'pool_props', and get the dnode |
|
790 |
* of the 'pool_props'. |
|
791 |
*/ |
|
792 |
if (zap_lookup(dn, DMU_POOL_PROPS, &objnum, stack)) |
|
793 |
return (ERR_FILESYSTEM_NOT_FOUND); |
|
794 |
||
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
795 |
if (errnum = dnode_get(mosmdn, objnum, DMU_OT_POOL_PROPS, dn, stack)) |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
796 |
return (errnum); |
3912 | 797 |
|
798 |
if (zap_lookup(dn, ZPOOL_PROP_BOOTFS, &objnum, stack)) |
|
799 |
return (ERR_FILESYSTEM_NOT_FOUND); |
|
800 |
||
801 |
if (!objnum) |
|
802 |
return (ERR_FILESYSTEM_NOT_FOUND); |
|
803 |
||
804 |
*obj = objnum; |
|
805 |
return (0); |
|
806 |
} |
|
807 |
||
808 |
/* |
|
809 |
* Given a MOS metadnode, get the metadnode of a given filesystem name (fsname), |
|
810 |
* e.g. pool/rootfs, or a given object number (obj), e.g. the object number |
|
811 |
* of pool/rootfs. |
|
812 |
* |
|
813 |
* If no fsname and no obj are given, return the DSL_DIR metadnode. |
|
814 |
* If fsname is given, return its metadnode and its matching object number. |
|
815 |
* If only obj is given, return the metadnode for this object number. |
|
816 |
* |
|
817 |
* Return: |
|
818 |
* 0 - success |
|
819 |
* errnum - failure |
|
820 |
*/ |
|
821 |
static int |
|
822 |
get_objset_mdn(dnode_phys_t *mosmdn, char *fsname, uint64_t *obj, |
|
823 |
dnode_phys_t *mdn, char *stack) |
|
824 |
{ |
|
825 |
uint64_t objnum, headobj; |
|
826 |
char *cname, ch; |
|
827 |
blkptr_t *bp; |
|
828 |
objset_phys_t *osp; |
|
829 |
||
830 |
if (fsname == NULL && obj) { |
|
831 |
headobj = *obj; |
|
832 |
goto skip; |
|
833 |
} |
|
834 |
||
835 |
if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, |
|
836 |
DMU_OT_OBJECT_DIRECTORY, mdn, stack)) |
|
837 |
return (errnum); |
|
838 |
||
839 |
if (errnum = zap_lookup(mdn, DMU_POOL_ROOT_DATASET, &objnum, |
|
840 |
stack)) |
|
841 |
return (errnum); |
|
842 |
||
843 |
if (errnum = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, mdn, stack)) |
|
844 |
return (errnum); |
|
845 |
||
846 |
if (fsname == NULL) { |
|
847 |
headobj = |
|
848 |
((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; |
|
849 |
goto skip; |
|
850 |
} |
|
851 |
||
852 |
/* take out the pool name */ |
|
853 |
while (*fsname && !isspace(*fsname) && *fsname != '/') |
|
854 |
fsname++; |
|
855 |
||
856 |
while (*fsname && !isspace(*fsname)) { |
|
857 |
uint64_t childobj; |
|
858 |
||
859 |
while (*fsname == '/') |
|
860 |
fsname++; |
|
861 |
||
862 |
cname = fsname; |
|
863 |
while (*fsname && !isspace(*fsname) && *fsname != '/') |
|
864 |
fsname++; |
|
865 |
ch = *fsname; |
|
866 |
*fsname = 0; |
|
867 |
||
868 |
childobj = |
|
869 |
((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_child_dir_zapobj; |
|
870 |
if (errnum = dnode_get(mosmdn, childobj, |
|
871 |
DMU_OT_DSL_DIR_CHILD_MAP, mdn, stack)) |
|
872 |
return (errnum); |
|
873 |
||
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
874 |
if (zap_lookup(mdn, cname, &objnum, stack)) |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
875 |
return (ERR_FILESYSTEM_NOT_FOUND); |
3912 | 876 |
|
877 |
if (errnum = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, |
|
878 |
mdn, stack)) |
|
879 |
return (errnum); |
|
880 |
||
881 |
*fsname = ch; |
|
882 |
} |
|
883 |
headobj = ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; |
|
884 |
if (obj) |
|
885 |
*obj = headobj; |
|
886 |
||
887 |
skip: |
|
888 |
if (errnum = dnode_get(mosmdn, headobj, DMU_OT_DSL_DATASET, mdn, stack)) |
|
889 |
return (errnum); |
|
890 |
||
891 |
/* TODO: Add snapshot support here - for fsname=snapshot-name */ |
|
892 |
||
893 |
bp = &((dsl_dataset_phys_t *)DN_BONUS(mdn))->ds_bp; |
|
894 |
osp = (objset_phys_t *)stack; |
|
895 |
stack += sizeof (objset_phys_t); |
|
896 |
if (errnum = zio_read(bp, osp, stack)) |
|
897 |
return (errnum); |
|
898 |
||
899 |
grub_memmove((char *)mdn, (char *)&osp->os_meta_dnode, DNODE_SIZE); |
|
900 |
||
901 |
return (0); |
|
902 |
} |
|
903 |
||
904 |
/* |
|
6423 | 905 |
* For a given XDR packed nvlist, verify the first 4 bytes and move on. |
3912 | 906 |
* |
6423 | 907 |
* An XDR packed nvlist is encoded as (comments from nvs_xdr_create) : |
3912 | 908 |
* |
909 |
* encoding method/host endian (4 bytes) |
|
910 |
* nvl_version (4 bytes) |
|
911 |
* nvl_nvflag (4 bytes) |
|
912 |
* encoded nvpairs: |
|
913 |
* encoded size of the nvpair (4 bytes) |
|
914 |
* decoded size of the nvpair (4 bytes) |
|
915 |
* name string size (4 bytes) |
|
916 |
* name string data (sizeof(NV_ALIGN4(string)) |
|
917 |
* data type (4 bytes) |
|
918 |
* # of elements in the nvpair (4 bytes) |
|
919 |
* data |
|
920 |
* 2 zero's for the last nvpair |
|
921 |
* (end of the entire list) (8 bytes) |
|
922 |
* |
|
923 |
* Return: |
|
924 |
* 0 - success |
|
925 |
* 1 - failure |
|
926 |
*/ |
|
6423 | 927 |
static int |
928 |
nvlist_unpack(char *nvlist, char **out) |
|
3912 | 929 |
{ |
930 |
/* Verify if the 1st and 2nd byte in the nvlist are valid. */ |
|
931 |
if (nvlist[0] != NV_ENCODE_XDR || nvlist[1] != HOST_ENDIAN) |
|
932 |
return (1); |
|
933 |
||
6423 | 934 |
nvlist += 4; |
935 |
*out = nvlist; |
|
936 |
return (0); |
|
937 |
} |
|
938 |
||
939 |
static char * |
|
940 |
nvlist_array(char *nvlist, int index) |
|
941 |
{ |
|
942 |
int i, encode_size; |
|
943 |
||
944 |
for (i = 0; i < index; i++) { |
|
945 |
/* skip the header, nvl_version, and nvl_nvflag */ |
|
946 |
nvlist = nvlist + 4 * 2; |
|
947 |
||
948 |
while (encode_size = BSWAP_32(*(uint32_t *)nvlist)) |
|
949 |
nvlist += encode_size; /* goto the next nvpair */ |
|
950 |
||
951 |
nvlist = nvlist + 4 * 2; /* skip the ending 2 zeros - 8 bytes */ |
|
952 |
} |
|
953 |
||
954 |
return (nvlist); |
|
955 |
} |
|
956 |
||
957 |
static int |
|
958 |
nvlist_lookup_value(char *nvlist, char *name, void *val, int valtype, |
|
959 |
int *nelmp) |
|
960 |
{ |
|
961 |
int name_len, type, slen, encode_size; |
|
962 |
char *nvpair, *nvp_name, *strval = val; |
|
963 |
uint64_t *intval = val; |
|
964 |
||
3912 | 965 |
/* skip the header, nvl_version, and nvl_nvflag */ |
6423 | 966 |
nvlist = nvlist + 4 * 2; |
3912 | 967 |
|
968 |
/* |
|
969 |
* Loop thru the nvpair list |
|
970 |
* The XDR representation of an integer is in big-endian byte order. |
|
971 |
*/ |
|
972 |
while (encode_size = BSWAP_32(*(uint32_t *)nvlist)) { |
|
973 |
||
974 |
nvpair = nvlist + 4 * 2; /* skip the encode/decode size */ |
|
975 |
||
976 |
name_len = BSWAP_32(*(uint32_t *)nvpair); |
|
977 |
nvpair += 4; |
|
978 |
||
979 |
nvp_name = nvpair; |
|
980 |
nvpair = nvpair + ((name_len + 3) & ~3); /* align */ |
|
981 |
||
982 |
type = BSWAP_32(*(uint32_t *)nvpair); |
|
983 |
nvpair += 4; |
|
984 |
||
985 |
if ((grub_strncmp(nvp_name, name, name_len) == 0) && |
|
986 |
type == valtype) { |
|
6423 | 987 |
int nelm; |
3912 | 988 |
|
6423 | 989 |
if ((nelm = BSWAP_32(*(uint32_t *)nvpair)) < 1) |
3912 | 990 |
return (1); |
991 |
nvpair += 4; |
|
992 |
||
993 |
switch (valtype) { |
|
994 |
case DATA_TYPE_STRING: |
|
995 |
slen = BSWAP_32(*(uint32_t *)nvpair); |
|
996 |
nvpair += 4; |
|
997 |
grub_memmove(strval, nvpair, slen); |
|
998 |
strval[slen] = '\0'; |
|
999 |
return (0); |
|
1000 |
||
1001 |
case DATA_TYPE_UINT64: |
|
1002 |
*intval = BSWAP_64(*(uint64_t *)nvpair); |
|
1003 |
return (0); |
|
6423 | 1004 |
|
1005 |
case DATA_TYPE_NVLIST: |
|
1006 |
*(void **)val = (void *)nvpair; |
|
1007 |
return (0); |
|
1008 |
||
1009 |
case DATA_TYPE_NVLIST_ARRAY: |
|
1010 |
*(void **)val = (void *)nvpair; |
|
1011 |
if (nelmp) |
|
1012 |
*nelmp = nelm; |
|
1013 |
return (0); |
|
3912 | 1014 |
} |
1015 |
} |
|
1016 |
||
1017 |
nvlist += encode_size; /* goto the next nvpair */ |
|
1018 |
} |
|
1019 |
||
1020 |
return (1); |
|
1021 |
} |
|
1022 |
||
1023 |
/* |
|
6423 | 1024 |
* Check if this vdev is online and is in a good state. |
1025 |
*/ |
|
1026 |
static int |
|
1027 |
vdev_validate(char *nv) |
|
1028 |
{ |
|
1029 |
uint64_t ival; |
|
1030 |
||
1031 |
if (nvlist_lookup_value(nv, ZPOOL_CONFIG_OFFLINE, &ival, |
|
1032 |
DATA_TYPE_UINT64, NULL) == 0 || |
|
1033 |
nvlist_lookup_value(nv, ZPOOL_CONFIG_FAULTED, &ival, |
|
1034 |
DATA_TYPE_UINT64, NULL) == 0 || |
|
1035 |
nvlist_lookup_value(nv, ZPOOL_CONFIG_DEGRADED, &ival, |
|
1036 |
DATA_TYPE_UINT64, NULL) == 0 || |
|
1037 |
nvlist_lookup_value(nv, ZPOOL_CONFIG_REMOVED, &ival, |
|
1038 |
DATA_TYPE_UINT64, NULL) == 0) |
|
1039 |
return (ERR_DEV_VALUES); |
|
1040 |
||
1041 |
return (0); |
|
1042 |
} |
|
1043 |
||
1044 |
/* |
|
1045 |
* Get a list of valid vdev pathname from the boot device. |
|
1046 |
* The caller should already allocate MAXNAMELEN memory for bootpath. |
|
1047 |
*/ |
|
1048 |
static int |
|
1049 |
vdev_get_bootpath(char *nv, char *bootpath) |
|
1050 |
{ |
|
1051 |
char type[16]; |
|
1052 |
||
1053 |
bootpath[0] = '\0'; |
|
1054 |
if (nvlist_lookup_value(nv, ZPOOL_CONFIG_TYPE, &type, DATA_TYPE_STRING, |
|
1055 |
NULL)) |
|
1056 |
return (ERR_FSYS_CORRUPT); |
|
1057 |
||
1058 |
if (strcmp(type, VDEV_TYPE_DISK) == 0) { |
|
1059 |
if (vdev_validate(nv) != 0 || |
|
1060 |
nvlist_lookup_value(nv, ZPOOL_CONFIG_PHYS_PATH, bootpath, |
|
1061 |
DATA_TYPE_STRING, NULL) != 0) |
|
1062 |
return (ERR_NO_BOOTPATH); |
|
1063 |
||
1064 |
} else if (strcmp(type, VDEV_TYPE_MIRROR) == 0) { |
|
1065 |
int nelm, i; |
|
1066 |
char *child; |
|
1067 |
||
1068 |
if (nvlist_lookup_value(nv, ZPOOL_CONFIG_CHILDREN, &child, |
|
1069 |
DATA_TYPE_NVLIST_ARRAY, &nelm)) |
|
1070 |
return (ERR_FSYS_CORRUPT); |
|
1071 |
||
1072 |
for (i = 0; i < nelm; i++) { |
|
1073 |
char tmp_path[MAXNAMELEN]; |
|
1074 |
char *child_i; |
|
1075 |
||
1076 |
child_i = nvlist_array(child, i); |
|
1077 |
if (vdev_validate(child_i) != 0) |
|
1078 |
continue; |
|
1079 |
||
1080 |
if (nvlist_lookup_value(child_i, ZPOOL_CONFIG_PHYS_PATH, |
|
1081 |
tmp_path, DATA_TYPE_STRING, NULL) != 0) |
|
1082 |
return (ERR_NO_BOOTPATH); |
|
1083 |
||
1084 |
if ((strlen(bootpath) + strlen(tmp_path)) > MAXNAMELEN) |
|
1085 |
return (ERR_WONT_FIT); |
|
1086 |
||
1087 |
if (strlen(bootpath) == 0) |
|
1088 |
sprintf(bootpath, "%s", tmp_path); |
|
1089 |
else |
|
1090 |
sprintf(bootpath, "%s %s", bootpath, tmp_path); |
|
1091 |
} |
|
1092 |
} |
|
1093 |
||
1094 |
return (strlen(bootpath) > 0 ? 0 : ERR_NO_BOOTPATH); |
|
1095 |
} |
|
1096 |
||
1097 |
/* |
|
1098 |
* Check the disk label information and retrieve needed vdev name-value pairs. |
|
3912 | 1099 |
* |
1100 |
* Return: |
|
1101 |
* 0 - success |
|
6423 | 1102 |
* ERR_* - failure |
3912 | 1103 |
*/ |
6423 | 1104 |
static int |
1105 |
check_pool_label(int label, char *stack) |
|
3912 | 1106 |
{ |
1107 |
vdev_phys_t *vdev; |
|
6423 | 1108 |
uint64_t sector, pool_state, txg = 0; |
1109 |
char *nvlist, *nv; |
|
3912 | 1110 |
|
1111 |
sector = (label * sizeof (vdev_label_t) + VDEV_SKIP_SIZE + |
|
1112 |
VDEV_BOOT_HEADER_SIZE) >> SPA_MINBLOCKSHIFT; |
|
1113 |
||
1114 |
/* Read in the vdev name-value pair list (112K). */ |
|
1115 |
if (devread(sector, 0, VDEV_PHYS_SIZE, stack) == 0) |
|
1116 |
return (ERR_READ); |
|
1117 |
||
1118 |
vdev = (vdev_phys_t *)stack; |
|
1119 |
||
6423 | 1120 |
if (nvlist_unpack(vdev->vp_nvlist, &nvlist)) |
1121 |
return (ERR_FSYS_CORRUPT); |
|
1122 |
||
1123 |
if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_STATE, &pool_state, |
|
1124 |
DATA_TYPE_UINT64, NULL)) |
|
1125 |
return (ERR_FSYS_CORRUPT); |
|
1126 |
||
1127 |
if (pool_state == POOL_STATE_DESTROYED) |
|
1128 |
return (ERR_FILESYSTEM_NOT_FOUND); |
|
1129 |
||
1130 |
if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_NAME, |
|
1131 |
current_rootpool, DATA_TYPE_STRING, NULL)) |
|
3912 | 1132 |
return (ERR_FSYS_CORRUPT); |
6423 | 1133 |
|
1134 |
if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_TXG, &txg, |
|
1135 |
DATA_TYPE_UINT64, NULL)) |
|
1136 |
return (ERR_FSYS_CORRUPT); |
|
1137 |
||
1138 |
/* not an active device */ |
|
1139 |
if (txg == 0) |
|
1140 |
return (ERR_NO_BOOTPATH); |
|
1141 |
||
1142 |
if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_VDEV_TREE, &nv, |
|
1143 |
DATA_TYPE_NVLIST, NULL)) |
|
1144 |
return (ERR_FSYS_CORRUPT); |
|
1145 |
||
1146 |
if (vdev_get_bootpath(nv, current_bootpath)) |
|
1147 |
return (ERR_NO_BOOTPATH); |
|
1148 |
||
1149 |
return (0); |
|
3912 | 1150 |
} |
1151 |
||
1152 |
/* |
|
1153 |
* zfs_mount() locates a valid uberblock of the root pool and read in its MOS |
|
1154 |
* to the memory address MOS. |
|
1155 |
* |
|
1156 |
* Return: |
|
1157 |
* 1 - success |
|
1158 |
* 0 - failure |
|
1159 |
*/ |
|
1160 |
int |
|
1161 |
zfs_mount(void) |
|
1162 |
{ |
|
1163 |
char *stack; |
|
1164 |
int label = 0; |
|
1165 |
uberblock_phys_t *ub_array, *ubbest = NULL; |
|
1166 |
objset_phys_t *osp; |
|
1167 |
||
1168 |
/* if zfs is already mounted, don't do it again */ |
|
1169 |
if (is_zfs_mount == 1) |
|
1170 |
return (1); |
|
1171 |
||
1172 |
stackbase = ZFS_SCRATCH; |
|
1173 |
stack = stackbase; |
|
1174 |
ub_array = (uberblock_phys_t *)stack; |
|
1175 |
stack += VDEV_UBERBLOCK_RING; |
|
1176 |
||
1177 |
osp = (objset_phys_t *)stack; |
|
1178 |
stack += sizeof (objset_phys_t); |
|
1179 |
||
1180 |
/* XXX add back labels support? */ |
|
1181 |
for (label = 0; ubbest == NULL && label < (VDEV_LABELS/2); label++) { |
|
1182 |
uint64_t sector = (label * sizeof (vdev_label_t) + |
|
1183 |
VDEV_SKIP_SIZE + VDEV_BOOT_HEADER_SIZE + |
|
1184 |
VDEV_PHYS_SIZE) >> SPA_MINBLOCKSHIFT; |
|
1185 |
||
1186 |
/* Read in the uberblock ring (128K). */ |
|
1187 |
if (devread(sector, 0, VDEV_UBERBLOCK_RING, |
|
1188 |
(char *)ub_array) == 0) |
|
1189 |
continue; |
|
1190 |
||
1191 |
if ((ubbest = find_bestub(ub_array, label)) != NULL && |
|
1192 |
zio_read(&ubbest->ubp_uberblock.ub_rootbp, osp, stack) |
|
1193 |
== 0) { |
|
1194 |
||
1195 |
VERIFY_OS_TYPE(osp, DMU_OST_META); |
|
1196 |
||
1197 |
/* Got the MOS. Save it at the memory addr MOS. */ |
|
1198 |
grub_memmove(MOS, &osp->os_meta_dnode, DNODE_SIZE); |
|
1199 |
||
6423 | 1200 |
if (check_pool_label(label, stack)) |
3912 | 1201 |
return (0); |
1202 |
||
1203 |
is_zfs_mount = 1; |
|
1204 |
return (1); |
|
1205 |
} |
|
1206 |
} |
|
1207 |
||
1208 |
return (0); |
|
1209 |
} |
|
1210 |
||
1211 |
/* |
|
1212 |
* zfs_open() locates a file in the rootpool by following the |
|
1213 |
* MOS and places the dnode of the file in the memory address DNODE. |
|
1214 |
* |
|
1215 |
* Return: |
|
1216 |
* 1 - success |
|
1217 |
* 0 - failure |
|
1218 |
*/ |
|
1219 |
int |
|
1220 |
zfs_open(char *filename) |
|
1221 |
{ |
|
1222 |
char *stack; |
|
1223 |
dnode_phys_t *mdn; |
|
1224 |
||
1225 |
file_buf = NULL; |
|
1226 |
stackbase = ZFS_SCRATCH; |
|
1227 |
stack = stackbase; |
|
1228 |
||
1229 |
mdn = (dnode_phys_t *)stack; |
|
1230 |
stack += sizeof (dnode_phys_t); |
|
1231 |
||
1232 |
dnode_mdn = NULL; |
|
1233 |
dnode_buf = (dnode_phys_t *)stack; |
|
1234 |
stack += 1<<DNODE_BLOCK_SHIFT; |
|
1235 |
||
1236 |
/* |
|
1237 |
* menu.lst is placed at the root pool filesystem level, |
|
1238 |
* do not goto 'current_bootfs'. |
|
1239 |
*/ |
|
6448 | 1240 |
if (is_top_dataset_file(filename)) { |
3912 | 1241 |
if (errnum = get_objset_mdn(MOS, NULL, NULL, mdn, stack)) |
1242 |
return (0); |
|
1243 |
||
1244 |
current_bootfs_obj = 0; |
|
1245 |
} else { |
|
1246 |
if (current_bootfs[0] == '\0') { |
|
1247 |
/* Get the default root filesystem object number */ |
|
4725
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
1248 |
if (errnum = get_default_bootfsobj(MOS, |
0452c60b6e69
6541114 GRUB/ZFS fails to load files from a default compressed (lzjb) root
lling
parents:
4577
diff
changeset
|
1249 |
¤t_bootfs_obj, stack)) |
3912 | 1250 |
return (0); |
1251 |
||
1252 |
if (errnum = get_objset_mdn(MOS, NULL, |
|
1253 |
¤t_bootfs_obj, mdn, stack)) |
|
1254 |
return (0); |
|
1255 |
} else { |
|
1256 |
if (errnum = get_objset_mdn(MOS, |
|
1257 |
current_bootfs, ¤t_bootfs_obj, mdn, stack)) |
|
1258 |
return (0); |
|
1259 |
} |
|
1260 |
} |
|
1261 |
||
1262 |
if (dnode_get_path(mdn, filename, DNODE, stack)) { |
|
1263 |
errnum = ERR_FILE_NOT_FOUND; |
|
1264 |
return (0); |
|
1265 |
} |
|
1266 |
||
1267 |
/* get the file size and set the file position to 0 */ |
|
1268 |
filemax = ((znode_phys_t *)DN_BONUS(DNODE))->zp_size; |
|
1269 |
filepos = 0; |
|
1270 |
||
1271 |
dnode_buf = NULL; |
|
1272 |
return (1); |
|
1273 |
} |
|
1274 |
||
1275 |
/* |
|
1276 |
* zfs_read reads in the data blocks pointed by the DNODE. |
|
1277 |
* |
|
1278 |
* Return: |
|
1279 |
* len - the length successfully read in to the buffer |
|
1280 |
* 0 - failure |
|
1281 |
*/ |
|
1282 |
int |
|
1283 |
zfs_read(char *buf, int len) |
|
1284 |
{ |
|
1285 |
char *stack; |
|
1286 |
char *tmpbuf; |
|
1287 |
int blksz, length, movesize; |
|
1288 |
||
1289 |
if (file_buf == NULL) { |
|
1290 |
file_buf = stackbase; |
|
1291 |
stackbase += SPA_MAXBLOCKSIZE; |
|
1292 |
file_start = file_end = 0; |
|
1293 |
} |
|
1294 |
stack = stackbase; |
|
1295 |
||
1296 |
/* |
|
1297 |
* If offset is in memory, move it into the buffer provided and return. |
|
1298 |
*/ |
|
1299 |
if (filepos >= file_start && filepos+len <= file_end) { |
|
1300 |
grub_memmove(buf, file_buf + filepos - file_start, len); |
|
1301 |
filepos += len; |
|
1302 |
return (len); |
|
1303 |
} |
|
1304 |
||
1305 |
blksz = DNODE->dn_datablkszsec << SPA_MINBLOCKSHIFT; |
|
1306 |
||
1307 |
/* |
|
1308 |
* Entire Dnode is too big to fit into the space available. We |
|
1309 |
* will need to read it in chunks. This could be optimized to |
|
1310 |
* read in as large a chunk as there is space available, but for |
|
1311 |
* now, this only reads in one data block at a time. |
|
1312 |
*/ |
|
1313 |
length = len; |
|
1314 |
while (length) { |
|
1315 |
/* |
|
1316 |
* Find requested blkid and the offset within that block. |
|
1317 |
*/ |
|
1318 |
uint64_t blkid = filepos / blksz; |
|
1319 |
||
1320 |
if (errnum = dmu_read(DNODE, blkid, file_buf, stack)) |
|
1321 |
return (0); |
|
1322 |
||
1323 |
file_start = blkid * blksz; |
|
1324 |
file_end = file_start + blksz; |
|
1325 |
||
1326 |
movesize = MIN(length, file_end - filepos); |
|
1327 |
||
1328 |
grub_memmove(buf, file_buf + filepos - file_start, |
|
1329 |
movesize); |
|
1330 |
buf += movesize; |
|
1331 |
length -= movesize; |
|
1332 |
filepos += movesize; |
|
1333 |
} |
|
1334 |
||
1335 |
return (len); |
|
1336 |
} |
|
1337 |
||
1338 |
/* |
|
1339 |
* No-Op |
|
1340 |
*/ |
|
1341 |
int |
|
1342 |
zfs_embed(int *start_sector, int needed_sectors) |
|
1343 |
{ |
|
1344 |
return (1); |
|
1345 |
} |
|
1346 |
||
1347 |
#endif /* FSYS_ZFS */ |