Diff markup
1 /********************************************* 1 /************************************************************
2 * EFI GUID Partition Table handling 2 * EFI GUID Partition Table handling
3 * Per Intel EFI Specification v1.02 3 * Per Intel EFI Specification v1.02
4 * http://developer.intel.com/technology/efi/e 4 * http://developer.intel.com/technology/efi/efi.htm
5 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.c 5 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
6 * Copyright 2000,2001,2002,2004 Dell Inc. 6 * Copyright 2000,2001,2002,2004 Dell Inc.
7 * 7 *
8 * This program is free software; you can red 8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Publ 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either versi 10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 11 * (at your option) any later version.
12 * 12 *
13 * This program is distributed in the hope th 13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULA 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more detail 16 * GNU General Public License for more details.
17 * 17 *
18 * You should have received a copy of the GNU 18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to 19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 3 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * 21 *
22 * 22 *
23 * TODO: 23 * TODO:
24 * 24 *
25 * Changelog: 25 * Changelog:
26 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@de 26 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
27 * - test for valid PMBR and valid PGPT before 27 * - test for valid PMBR and valid PGPT before ever reading
28 * AGPT, allow override with 'gpt' kernel co 28 * AGPT, allow override with 'gpt' kernel command line option.
29 * - check for first/last_usable_lba outside o 29 * - check for first/last_usable_lba outside of size of disk
30 * 30 *
31 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@d 31 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
32 * - Ported to 2.5.7-pre1 and 2.5.7-dj2 32 * - Ported to 2.5.7-pre1 and 2.5.7-dj2
33 * - Applied patch to avoid fault in alternate 33 * - Applied patch to avoid fault in alternate header handling
34 * - cleaned up find_valid_gpt 34 * - cleaned up find_valid_gpt
35 * - On-disk structure and copy in memory is * 35 * - On-disk structure and copy in memory is *always* LE now -
36 * swab fields as needed 36 * swab fields as needed
37 * - remove print_gpt_header() 37 * - remove print_gpt_header()
38 * - only use first max_p partition entries, t 38 * - only use first max_p partition entries, to keep the kernel minor number
39 * and partition numbers tied. 39 * and partition numbers tied.
40 * 40 *
41 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@d 41 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
42 * - Removed __PRIPTR_PREFIX - not being used 42 * - Removed __PRIPTR_PREFIX - not being used
43 * 43 *
44 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@d 44 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
45 * - Ported to 2.5.2-pre11 + library crc32 pat 45 * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
46 * 46 *
47 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@del 47 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
48 * - Added compare_gpts(). 48 * - Added compare_gpts().
49 * - moved le_efi_guid_to_cpus() back into thi 49 * - moved le_efi_guid_to_cpus() back into this file. GPT is the only
50 * thing that keeps EFI GUIDs on disk. 50 * thing that keeps EFI GUIDs on disk.
51 * - Changed gpt structure names and members t 51 * - Changed gpt structure names and members to be simpler and more Linux-like.
52 * 52 *
53 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@de 53 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
54 * - Removed CONFIG_DEVFS_VOLUMES_UUID code en 54 * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
55 * 55 *
56 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@de 56 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
57 * - Changed function comments to DocBook styl 57 * - Changed function comments to DocBook style per Andreas Dilger suggestion.
58 * 58 *
59 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@de 59 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
60 * - Change read_lba() to use the page cache p 60 * - Change read_lba() to use the page cache per Al Viro's work.
61 * - print u64s properly on all architectures 61 * - print u64s properly on all architectures
62 * - fixed debug_printk(), now Dprintk() 62 * - fixed debug_printk(), now Dprintk()
63 * 63 *
64 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@de 64 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
65 * - Style cleanups 65 * - Style cleanups
66 * - made most functions static 66 * - made most functions static
67 * - Endianness addition 67 * - Endianness addition
68 * - remove test for second alternate header, 68 * - remove test for second alternate header, as it's not per spec,
69 * and is unnecessary. There's now a method 69 * and is unnecessary. There's now a method to read/write the last
70 * sector of an odd-sized disk from user spa 70 * sector of an odd-sized disk from user space. No tools have ever
71 * been released which used this code, so it 71 * been released which used this code, so it's effectively dead.
72 * - Per Asit Mallick of Intel, added a test f 72 * - Per Asit Mallick of Intel, added a test for a valid PMBR.
73 * - Added kernel command line option 'gpt' to 73 * - Added kernel command line option 'gpt' to override valid PMBR test.
74 * 74 *
75 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@ 75 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
76 * - added devfs volume UUID support (/dev/vol 76 * - added devfs volume UUID support (/dev/volumes/uuids) for
77 * mounting file systems by the partition GU 77 * mounting file systems by the partition GUID.
78 * 78 *
79 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@de 79 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com>
80 * - Moved crc32() to linux/lib, added efi_crc 80 * - Moved crc32() to linux/lib, added efi_crc32().
81 * 81 *
82 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@de 82 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
83 * - Replaced Intel's CRC32 function with an e 83 * - Replaced Intel's CRC32 function with an equivalent
84 * non-license-restricted version. 84 * non-license-restricted version.
85 * 85 *
86 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@de 86 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
87 * - Fixed the last_lba() call to return the p 87 * - Fixed the last_lba() call to return the proper last block
88 * 88 *
89 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@de 89 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
90 * - Thanks to Andries Brouwer for his debuggi 90 * - Thanks to Andries Brouwer for his debugging assistance.
91 * - Code works, detects all the partitions. 91 * - Code works, detects all the partitions.
92 * 92 *
93 ********************************************* 93 ************************************************************/
94 #include <linux/crc32.h> 94 #include <linux/crc32.h>
95 #include "check.h" 95 #include "check.h"
96 #include "efi.h" 96 #include "efi.h"
97 97
98 #undef EFI_DEBUG 98 #undef EFI_DEBUG
99 #ifdef EFI_DEBUG 99 #ifdef EFI_DEBUG
100 #define Dprintk(x...) printk(KERN_DEBUG x) 100 #define Dprintk(x...) printk(KERN_DEBUG x)
101 #else 101 #else
102 #define Dprintk(x...) 102 #define Dprintk(x...)
103 #endif 103 #endif
104 104
105 /* This allows a kernel command line option 'g 105 /* This allows a kernel command line option 'gpt' to override
106 * the test for invalid PMBR. Not __initdata 106 * the test for invalid PMBR. Not __initdata because reloading
107 * the partition tables happens after init too 107 * the partition tables happens after init too.
108 */ 108 */
109 static int force_gpt; 109 static int force_gpt;
110 static int __init 110 static int __init
111 force_gpt_fn(char *str) 111 force_gpt_fn(char *str)
112 { 112 {
113 force_gpt = 1; 113 force_gpt = 1;
114 return 1; 114 return 1;
115 } 115 }
116 __setup("gpt", force_gpt_fn); 116 __setup("gpt", force_gpt_fn);
117 117
118 118
119 /** 119 /**
120 * efi_crc32() - EFI version of crc32 function 120 * efi_crc32() - EFI version of crc32 function
121 * @buf: buffer to calculate crc32 of 121 * @buf: buffer to calculate crc32 of
122 * @len - length of buf 122 * @len - length of buf
123 * 123 *
124 * Description: Returns EFI-style CRC32 value 124 * Description: Returns EFI-style CRC32 value for @buf
125 * 125 *
126 * This function uses the little endian Ethern 126 * This function uses the little endian Ethernet polynomial
127 * but seeds the function with ~0, and xor's w 127 * but seeds the function with ~0, and xor's with ~0 at the end.
128 * Note, the EFI Specification, v1.02, has a r 128 * Note, the EFI Specification, v1.02, has a reference to
129 * Dr. Dobbs Journal, May 1994 (actually it's 129 * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
130 */ 130 */
131 static inline u32 131 static inline u32
132 efi_crc32(const void *buf, unsigned long len) 132 efi_crc32(const void *buf, unsigned long len)
133 { 133 {
134 return (crc32(~0L, buf, len) ^ ~0L); 134 return (crc32(~0L, buf, len) ^ ~0L);
135 } 135 }
136 136
137 /** 137 /**
138 * last_lba(): return number of last logical b 138 * last_lba(): return number of last logical block of device
139 * @bdev: block device 139 * @bdev: block device
140 * 140 *
141 * Description: Returns last LBA value on succ 141 * Description: Returns last LBA value on success, 0 on error.
142 * This is stored (by sd and ide-geometry) in 142 * This is stored (by sd and ide-geometry) in
143 * the part[0] entry for this disk, and is th 143 * the part[0] entry for this disk, and is the number of
144 * physical sectors available on the disk. 144 * physical sectors available on the disk.
145 */ 145 */
146 static u64 146 static u64
147 last_lba(struct block_device *bdev) 147 last_lba(struct block_device *bdev)
148 { 148 {
149 if (!bdev || !bdev->bd_inode) 149 if (!bdev || !bdev->bd_inode)
150 return 0; 150 return 0;
151 return (bdev->bd_inode->i_size >> 9) - 151 return (bdev->bd_inode->i_size >> 9) - 1ULL;
152 } 152 }
153 153
154 static inline int 154 static inline int
155 pmbr_part_valid(struct partition *part) 155 pmbr_part_valid(struct partition *part)
156 { 156 {
157 if (part->sys_ind == EFI_PMBR_OSTYPE_E 157 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
158 le32_to_cpu(part->start_sect) == 1 158 le32_to_cpu(part->start_sect) == 1UL)
159 return 1; 159 return 1;
160 return 0; 160 return 0;
161 } 161 }
162 162
163 /** 163 /**
164 * is_pmbr_valid(): test Protective MBR for va 164 * is_pmbr_valid(): test Protective MBR for validity
165 * @mbr: pointer to a legacy mbr structure 165 * @mbr: pointer to a legacy mbr structure
166 * 166 *
167 * Description: Returns 1 if PMBR is valid, 0 167 * Description: Returns 1 if PMBR is valid, 0 otherwise.
168 * Validity depends on two things: 168 * Validity depends on two things:
169 * 1) MSDOS signature is in the last two byte 169 * 1) MSDOS signature is in the last two bytes of the MBR
170 * 2) One partition of type 0xEE is found 170 * 2) One partition of type 0xEE is found
171 */ 171 */
172 static int 172 static int
173 is_pmbr_valid(legacy_mbr *mbr) 173 is_pmbr_valid(legacy_mbr *mbr)
174 { 174 {
175 int i; 175 int i;
176 if (!mbr || le16_to_cpu(mbr->signature 176 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
177 return 0; 177 return 0;
178 for (i = 0; i < 4; i++) 178 for (i = 0; i < 4; i++)
179 if (pmbr_part_valid(&mbr->part 179 if (pmbr_part_valid(&mbr->partition_record[i]))
180 return 1; 180 return 1;
181 return 0; 181 return 0;
182 } 182 }
183 183
184 /** 184 /**
185 * read_lba(): Read bytes from disk, starting 185 * read_lba(): Read bytes from disk, starting at given LBA
186 * @bdev 186 * @bdev
187 * @lba 187 * @lba
188 * @buffer 188 * @buffer
189 * @size_t 189 * @size_t
190 * 190 *
191 * Description: Reads @count bytes from @bdev 191 * Description: Reads @count bytes from @bdev into @buffer.
192 * Returns number of bytes read on success, 0 192 * Returns number of bytes read on success, 0 on error.
193 */ 193 */
194 static size_t 194 static size_t
195 read_lba(struct block_device *bdev, u64 lba, u 195 read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
196 { 196 {
197 size_t totalreadcount = 0; 197 size_t totalreadcount = 0;
198 198
199 if (!bdev || !buffer || lba > last_lba 199 if (!bdev || !buffer || lba > last_lba(bdev))
200 return 0; 200 return 0;
201 201
202 while (count) { 202 while (count) {
203 int copied = 512; 203 int copied = 512;
204 Sector sect; 204 Sector sect;
205 unsigned char *data = read_dev 205 unsigned char *data = read_dev_sector(bdev, lba++, §);
206 if (!data) 206 if (!data)
207 break; 207 break;
208 if (copied > count) 208 if (copied > count)
209 copied = count; 209 copied = count;
210 memcpy(buffer, data, copied); 210 memcpy(buffer, data, copied);
211 put_dev_sector(sect); 211 put_dev_sector(sect);
212 buffer += copied; 212 buffer += copied;
213 totalreadcount +=copied; 213 totalreadcount +=copied;
214 count -= copied; 214 count -= copied;
215 } 215 }
216 return totalreadcount; 216 return totalreadcount;
217 } 217 }
218 218
219 /** 219 /**
220 * alloc_read_gpt_entries(): reads partition e 220 * alloc_read_gpt_entries(): reads partition entries from disk
221 * @bdev 221 * @bdev
222 * @gpt - GPT header 222 * @gpt - GPT header
223 * 223 *
224 * Description: Returns ptes on success, NULL 224 * Description: Returns ptes on success, NULL on error.
225 * Allocates space for PTEs based on informati 225 * Allocates space for PTEs based on information found in @gpt.
226 * Notes: remember to free pte when you're don 226 * Notes: remember to free pte when you're done!
227 */ 227 */
228 static gpt_entry * 228 static gpt_entry *
229 alloc_read_gpt_entries(struct block_device *bd 229 alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
230 { 230 {
231 size_t count; 231 size_t count;
232 gpt_entry *pte; 232 gpt_entry *pte;
233 if (!bdev || !gpt) 233 if (!bdev || !gpt)
234 return NULL; 234 return NULL;
235 235
236 count = le32_to_cpu(gpt->num_partition 236 count = le32_to_cpu(gpt->num_partition_entries) *
237 le32_to_cpu(gpt->sizeof_partit 237 le32_to_cpu(gpt->sizeof_partition_entry);
238 if (!count) 238 if (!count)
239 return NULL; 239 return NULL;
240 pte = kzalloc(count, GFP_KERNEL); 240 pte = kzalloc(count, GFP_KERNEL);
241 if (!pte) 241 if (!pte)
242 return NULL; 242 return NULL;
243 243
244 if (read_lba(bdev, le64_to_cpu(gpt->pa 244 if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba),
245 (u8 *) pte, 245 (u8 *) pte,
246 count) < count) { 246 count) < count) {
247 kfree(pte); 247 kfree(pte);
248 pte=NULL; 248 pte=NULL;
249 return NULL; 249 return NULL;
250 } 250 }
251 return pte; 251 return pte;
252 } 252 }
253 253
254 /** 254 /**
255 * alloc_read_gpt_header(): Allocates GPT head 255 * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
256 * @bdev 256 * @bdev
257 * @lba is the Logical Block Address of the pa 257 * @lba is the Logical Block Address of the partition table
258 * 258 *
259 * Description: returns GPT header on success, 259 * Description: returns GPT header on success, NULL on error. Allocates
260 * and fills a GPT header starting at @ from @ 260 * and fills a GPT header starting at @ from @bdev.
261 * Note: remember to free gpt when finished wi 261 * Note: remember to free gpt when finished with it.
262 */ 262 */
263 static gpt_header * 263 static gpt_header *
264 alloc_read_gpt_header(struct block_device *bde 264 alloc_read_gpt_header(struct block_device *bdev, u64 lba)
265 { 265 {
266 gpt_header *gpt; 266 gpt_header *gpt;
267 if (!bdev) 267 if (!bdev)
268 return NULL; 268 return NULL;
269 269
270 gpt = kzalloc(sizeof (gpt_header), GFP 270 gpt = kzalloc(sizeof (gpt_header), GFP_KERNEL);
271 if (!gpt) 271 if (!gpt)
272 return NULL; 272 return NULL;
273 273
274 if (read_lba(bdev, lba, (u8 *) gpt, 274 if (read_lba(bdev, lba, (u8 *) gpt,
275 sizeof (gpt_header)) < si 275 sizeof (gpt_header)) < sizeof (gpt_header)) {
276 kfree(gpt); 276 kfree(gpt);
277 gpt=NULL; 277 gpt=NULL;
278 return NULL; 278 return NULL;
279 } 279 }
280 280
281 return gpt; 281 return gpt;
282 } 282 }
283 283
284 /** 284 /**
285 * is_gpt_valid() - tests one GPT header and P 285 * is_gpt_valid() - tests one GPT header and PTEs for validity
286 * @bdev 286 * @bdev
287 * @lba is the logical block address of the GP 287 * @lba is the logical block address of the GPT header to test
288 * @gpt is a GPT header ptr, filled on return. 288 * @gpt is a GPT header ptr, filled on return.
289 * @ptes is a PTEs ptr, filled on return. 289 * @ptes is a PTEs ptr, filled on return.
290 * 290 *
291 * Description: returns 1 if valid, 0 on erro 291 * Description: returns 1 if valid, 0 on error.
292 * If valid, returns pointers to newly allocat 292 * If valid, returns pointers to newly allocated GPT header and PTEs.
293 */ 293 */
294 static int 294 static int
295 is_gpt_valid(struct block_device *bdev, u64 lb 295 is_gpt_valid(struct block_device *bdev, u64 lba,
296 gpt_header **gpt, gpt_entry **pte 296 gpt_header **gpt, gpt_entry **ptes)
297 { 297 {
298 u32 crc, origcrc; 298 u32 crc, origcrc;
299 u64 lastlba; 299 u64 lastlba;
300 300
301 if (!bdev || !gpt || !ptes) 301 if (!bdev || !gpt || !ptes)
302 return 0; 302 return 0;
303 if (!(*gpt = alloc_read_gpt_header(bde 303 if (!(*gpt = alloc_read_gpt_header(bdev, lba)))
304 return 0; 304 return 0;
305 305
306 /* Check the GUID Partition Table sign 306 /* Check the GUID Partition Table signature */
307 if (le64_to_cpu((*gpt)->signature) != 307 if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
308 Dprintk("GUID Partition Table 308 Dprintk("GUID Partition Table Header signature is wrong:"
309 "%lld != %lld\n", 309 "%lld != %lld\n",
310 (unsigned long long)le 310 (unsigned long long)le64_to_cpu((*gpt)->signature),
311 (unsigned long long)GP 311 (unsigned long long)GPT_HEADER_SIGNATURE);
312 goto fail; 312 goto fail;
313 } 313 }
314 314
315 /* Check the GUID Partition Table CRC 315 /* Check the GUID Partition Table CRC */
316 origcrc = le32_to_cpu((*gpt)->header_c 316 origcrc = le32_to_cpu((*gpt)->header_crc32);
317 (*gpt)->header_crc32 = 0; 317 (*gpt)->header_crc32 = 0;
318 crc = efi_crc32((const unsigned char * 318 crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
319 319
320 if (crc != origcrc) { 320 if (crc != origcrc) {
321 Dprintk 321 Dprintk
322 ("GUID Partition Table Hea 322 ("GUID Partition Table Header CRC is wrong: %x != %x\n",
323 crc, origcrc); 323 crc, origcrc);
324 goto fail; 324 goto fail;
325 } 325 }
326 (*gpt)->header_crc32 = cpu_to_le32(ori 326 (*gpt)->header_crc32 = cpu_to_le32(origcrc);
327 327
328 /* Check that the my_lba entry points 328 /* Check that the my_lba entry points to the LBA that contains
329 * the GUID Partition Table */ 329 * the GUID Partition Table */
330 if (le64_to_cpu((*gpt)->my_lba) != lba 330 if (le64_to_cpu((*gpt)->my_lba) != lba) {
331 Dprintk("GPT my_lba incorrect: 331 Dprintk("GPT my_lba incorrect: %lld != %lld\n",
332 (unsigned long long)le 332 (unsigned long long)le64_to_cpu((*gpt)->my_lba),
333 (unsigned long long)lb 333 (unsigned long long)lba);
334 goto fail; 334 goto fail;
335 } 335 }
336 336
337 /* Check the first_usable_lba and last 337 /* Check the first_usable_lba and last_usable_lba are
338 * within the disk. 338 * within the disk.
339 */ 339 */
340 lastlba = last_lba(bdev); 340 lastlba = last_lba(bdev);
341 if (le64_to_cpu((*gpt)->first_usable_l 341 if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
342 Dprintk("GPT: first_usable_lba 342 Dprintk("GPT: first_usable_lba incorrect: %lld > %lld\n",
343 (unsigned long long)le 343 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
344 (unsigned long long)la 344 (unsigned long long)lastlba);
345 goto fail; 345 goto fail;
346 } 346 }
347 if (le64_to_cpu((*gpt)->last_usable_lb 347 if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
348 Dprintk("GPT: last_usable_lba 348 Dprintk("GPT: last_usable_lba incorrect: %lld > %lld\n",
349 (unsigned long long)le 349 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
350 (unsigned long long)la 350 (unsigned long long)lastlba);
351 goto fail; 351 goto fail;
352 } 352 }
353 353
354 if (!(*ptes = alloc_read_gpt_entries(b 354 if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
355 goto fail; 355 goto fail;
356 356
357 /* Check the GUID Partition Entry Arra 357 /* Check the GUID Partition Entry Array CRC */
358 crc = efi_crc32((const unsigned char * 358 crc = efi_crc32((const unsigned char *) (*ptes),
359 le32_to_cpu((*gpt)->nu 359 le32_to_cpu((*gpt)->num_partition_entries) *
360 le32_to_cpu((*gpt)->si 360 le32_to_cpu((*gpt)->sizeof_partition_entry));
361 361
362 if (crc != le32_to_cpu((*gpt)->partiti 362 if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
363 Dprintk("GUID Partitition Entr 363 Dprintk("GUID Partitition Entry Array CRC check failed.\n");
364 goto fail_ptes; 364 goto fail_ptes;
365 } 365 }
366 366
367 /* We're done, all's well */ 367 /* We're done, all's well */
368 return 1; 368 return 1;
369 369
370 fail_ptes: 370 fail_ptes:
371 kfree(*ptes); 371 kfree(*ptes);
372 *ptes = NULL; 372 *ptes = NULL;
373 fail: 373 fail:
374 kfree(*gpt); 374 kfree(*gpt);
375 *gpt = NULL; 375 *gpt = NULL;
376 return 0; 376 return 0;
377 } 377 }
378 378
379 /** 379 /**
380 * is_pte_valid() - tests one PTE for validity 380 * is_pte_valid() - tests one PTE for validity
381 * @pte is the pte to check 381 * @pte is the pte to check
382 * @lastlba is last lba of the disk 382 * @lastlba is last lba of the disk
383 * 383 *
384 * Description: returns 1 if valid, 0 on erro 384 * Description: returns 1 if valid, 0 on error.
385 */ 385 */
386 static inline int 386 static inline int
387 is_pte_valid(const gpt_entry *pte, const u64 l 387 is_pte_valid(const gpt_entry *pte, const u64 lastlba)
388 { 388 {
389 if ((!efi_guidcmp(pte->partition_type_ 389 if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
390 le64_to_cpu(pte->starting_lba) > l 390 le64_to_cpu(pte->starting_lba) > lastlba ||
391 le64_to_cpu(pte->ending_lba) > l 391 le64_to_cpu(pte->ending_lba) > lastlba)
392 return 0; 392 return 0;
393 return 1; 393 return 1;
394 } 394 }
395 395
396 /** 396 /**
397 * compare_gpts() - Search disk for valid GPT 397 * compare_gpts() - Search disk for valid GPT headers and PTEs
398 * @pgpt is the primary GPT header 398 * @pgpt is the primary GPT header
399 * @agpt is the alternate GPT header 399 * @agpt is the alternate GPT header
400 * @lastlba is the last LBA number 400 * @lastlba is the last LBA number
401 * Description: Returns nothing. Sanity check 401 * Description: Returns nothing. Sanity checks pgpt and agpt fields
402 * and prints warnings on discrepancies. 402 * and prints warnings on discrepancies.
403 * 403 *
404 */ 404 */
405 static void 405 static void
406 compare_gpts(gpt_header *pgpt, gpt_header *agp 406 compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
407 { 407 {
408 int error_found = 0; 408 int error_found = 0;
409 if (!pgpt || !agpt) 409 if (!pgpt || !agpt)
410 return; 410 return;
411 if (le64_to_cpu(pgpt->my_lba) != le64_ 411 if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
412 printk(KERN_WARNING 412 printk(KERN_WARNING
413 "GPT:Primary header LBA 413 "GPT:Primary header LBA != Alt. header alternate_lba\n");
414 printk(KERN_WARNING "GPT:%lld 414 printk(KERN_WARNING "GPT:%lld != %lld\n",
415 (unsigned long long)le6 415 (unsigned long long)le64_to_cpu(pgpt->my_lba),
416 (unsigned long long)le6 416 (unsigned long long)le64_to_cpu(agpt->alternate_lba));
417 error_found++; 417 error_found++;
418 } 418 }
419 if (le64_to_cpu(pgpt->alternate_lba) ! 419 if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
420 printk(KERN_WARNING 420 printk(KERN_WARNING
421 "GPT:Primary header alt 421 "GPT:Primary header alternate_lba != Alt. header my_lba\n");
422 printk(KERN_WARNING "GPT:%lld 422 printk(KERN_WARNING "GPT:%lld != %lld\n",
423 (unsigned long long)le6 423 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
424 (unsigned long long)le6 424 (unsigned long long)le64_to_cpu(agpt->my_lba));
425 error_found++; 425 error_found++;
426 } 426 }
427 if (le64_to_cpu(pgpt->first_usable_lba 427 if (le64_to_cpu(pgpt->first_usable_lba) !=
428 le64_to_cpu(agpt->first_usable_lba 428 le64_to_cpu(agpt->first_usable_lba)) {
429 printk(KERN_WARNING "GPT:first 429 printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
430 printk(KERN_WARNING "GPT:%lld 430 printk(KERN_WARNING "GPT:%lld != %lld\n",
431 (unsigned long long)le6 431 (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
432 (unsigned long long)le6 432 (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
433 error_found++; 433 error_found++;
434 } 434 }
435 if (le64_to_cpu(pgpt->last_usable_lba) 435 if (le64_to_cpu(pgpt->last_usable_lba) !=
436 le64_to_cpu(agpt->last_usable_lba) 436 le64_to_cpu(agpt->last_usable_lba)) {
437 printk(KERN_WARNING "GPT:last_ 437 printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
438 printk(KERN_WARNING "GPT:%lld 438 printk(KERN_WARNING "GPT:%lld != %lld\n",
439 (unsigned long long)le6 439 (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
440 (unsigned long long)le6 440 (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
441 error_found++; 441 error_found++;
442 } 442 }
443 if (efi_guidcmp(pgpt->disk_guid, agpt- 443 if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
444 printk(KERN_WARNING "GPT:disk_ 444 printk(KERN_WARNING "GPT:disk_guids don't match.\n");
445 error_found++; 445 error_found++;
446 } 446 }
447 if (le32_to_cpu(pgpt->num_partition_en 447 if (le32_to_cpu(pgpt->num_partition_entries) !=
448 le32_to_cpu(agpt->num_partition_en 448 le32_to_cpu(agpt->num_partition_entries)) {
449 printk(KERN_WARNING "GPT:num_p 449 printk(KERN_WARNING "GPT:num_partition_entries don't match: "
450 "0x%x != 0x%x\n", 450 "0x%x != 0x%x\n",
451 le32_to_cpu(pgpt->num_p 451 le32_to_cpu(pgpt->num_partition_entries),
452 le32_to_cpu(agpt->num_p 452 le32_to_cpu(agpt->num_partition_entries));
453 error_found++; 453 error_found++;
454 } 454 }
455 if (le32_to_cpu(pgpt->sizeof_partition 455 if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
456 le32_to_cpu(agpt->sizeof_partition 456 le32_to_cpu(agpt->sizeof_partition_entry)) {
457 printk(KERN_WARNING 457 printk(KERN_WARNING
458 "GPT:sizeof_partition_e 458 "GPT:sizeof_partition_entry values don't match: "
459 "0x%x != 0x%x\n", 459 "0x%x != 0x%x\n",
460 le32_to_cpu(pgpt->sizeo 460 le32_to_cpu(pgpt->sizeof_partition_entry),
461 le32_to_cpu(agpt->sizeo 461 le32_to_cpu(agpt->sizeof_partition_entry));
462 error_found++; 462 error_found++;
463 } 463 }
464 if (le32_to_cpu(pgpt->partition_entry_ 464 if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
465 le32_to_cpu(agpt->partition_entry_ 465 le32_to_cpu(agpt->partition_entry_array_crc32)) {
466 printk(KERN_WARNING 466 printk(KERN_WARNING
467 "GPT:partition_entry_ar 467 "GPT:partition_entry_array_crc32 values don't match: "
468 "0x%x != 0x%x\n", 468 "0x%x != 0x%x\n",
469 le32_to_cpu(pgpt->parti 469 le32_to_cpu(pgpt->partition_entry_array_crc32),
470 le32_to_cpu(agpt->parti 470 le32_to_cpu(agpt->partition_entry_array_crc32));
471 error_found++; 471 error_found++;
472 } 472 }
473 if (le64_to_cpu(pgpt->alternate_lba) ! 473 if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
474 printk(KERN_WARNING 474 printk(KERN_WARNING
475 "GPT:Primary header thi 475 "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
476 printk(KERN_WARNING "GPT:%lld 476 printk(KERN_WARNING "GPT:%lld != %lld\n",
477 (unsigned long long)le 477 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
478 (unsigned long long)la 478 (unsigned long long)lastlba);
479 error_found++; 479 error_found++;
480 } 480 }
481 481
482 if (le64_to_cpu(agpt->my_lba) != lastl 482 if (le64_to_cpu(agpt->my_lba) != lastlba) {
483 printk(KERN_WARNING 483 printk(KERN_WARNING
484 "GPT:Alternate GPT head 484 "GPT:Alternate GPT header not at the end of the disk.\n");
485 printk(KERN_WARNING "GPT:%lld 485 printk(KERN_WARNING "GPT:%lld != %lld\n",
486 (unsigned long long)le 486 (unsigned long long)le64_to_cpu(agpt->my_lba),
487 (unsigned long long)la 487 (unsigned long long)lastlba);
488 error_found++; 488 error_found++;
489 } 489 }
490 490
491 if (error_found) 491 if (error_found)
492 printk(KERN_WARNING 492 printk(KERN_WARNING
493 "GPT: Use GNU Parted to 493 "GPT: Use GNU Parted to correct GPT errors.\n");
494 return; 494 return;
495 } 495 }
496 496
497 /** 497 /**
498 * find_valid_gpt() - Search disk for valid GP 498 * find_valid_gpt() - Search disk for valid GPT headers and PTEs
499 * @bdev 499 * @bdev
500 * @gpt is a GPT header ptr, filled on return. 500 * @gpt is a GPT header ptr, filled on return.
501 * @ptes is a PTEs ptr, filled on return. 501 * @ptes is a PTEs ptr, filled on return.
502 * Description: Returns 1 if valid, 0 on error 502 * Description: Returns 1 if valid, 0 on error.
503 * If valid, returns pointers to newly allocat 503 * If valid, returns pointers to newly allocated GPT header and PTEs.
504 * Validity depends on PMBR being valid (or be 504 * Validity depends on PMBR being valid (or being overridden by the
505 * 'gpt' kernel command line option) and findi 505 * 'gpt' kernel command line option) and finding either the Primary
506 * GPT header and PTEs valid, or the Alternate 506 * GPT header and PTEs valid, or the Alternate GPT header and PTEs
507 * valid. If the Primary GPT header is not va 507 * valid. If the Primary GPT header is not valid, the Alternate GPT header
508 * is not checked unless the 'gpt' kernel comm 508 * is not checked unless the 'gpt' kernel command line option is passed.
509 * This protects against devices which misrepo 509 * This protects against devices which misreport their size, and forces
510 * the user to decide to use the Alternate GPT 510 * the user to decide to use the Alternate GPT.
511 */ 511 */
512 static int 512 static int
513 find_valid_gpt(struct block_device *bdev, gpt_ 513 find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
514 { 514 {
515 int good_pgpt = 0, good_agpt = 0, good 515 int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
516 gpt_header *pgpt = NULL, *agpt = NULL; 516 gpt_header *pgpt = NULL, *agpt = NULL;
517 gpt_entry *pptes = NULL, *aptes = NULL 517 gpt_entry *pptes = NULL, *aptes = NULL;
518 legacy_mbr *legacymbr; 518 legacy_mbr *legacymbr;
519 u64 lastlba; 519 u64 lastlba;
520 if (!bdev || !gpt || !ptes) 520 if (!bdev || !gpt || !ptes)
521 return 0; 521 return 0;
522 522
523 lastlba = last_lba(bdev); 523 lastlba = last_lba(bdev);
524 if (!force_gpt) { 524 if (!force_gpt) {
525 /* This will be added to the E 525 /* This will be added to the EFI Spec. per Intel after v1.02. */
526 legacymbr = kzalloc(sizeof (*l 526 legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
527 if (legacymbr) { 527 if (legacymbr) {
528 read_lba(bdev, 0, (u8 528 read_lba(bdev, 0, (u8 *) legacymbr,
529 sizeof (*lega 529 sizeof (*legacymbr));
530 good_pmbr = is_pmbr_va 530 good_pmbr = is_pmbr_valid(legacymbr);
531 kfree(legacymbr); 531 kfree(legacymbr);
532 } 532 }
533 if (!good_pmbr) 533 if (!good_pmbr)
534 goto fail; 534 goto fail;
535 } 535 }
536 536
537 good_pgpt = is_gpt_valid(bdev, GPT_PRI 537 good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA,
538 &pgpt, &pptes 538 &pgpt, &pptes);
539 if (good_pgpt) 539 if (good_pgpt)
540 good_agpt = is_gpt_valid(bdev, 540 good_agpt = is_gpt_valid(bdev,
541 le64_ 541 le64_to_cpu(pgpt->alternate_lba),
542 &agpt 542 &agpt, &aptes);
543 if (!good_agpt && force_gpt) 543 if (!good_agpt && force_gpt)
544 good_agpt = is_gpt_valid(bdev, 544 good_agpt = is_gpt_valid(bdev, lastlba,
545 &agpt 545 &agpt, &aptes);
546 546
547 /* The obviously unsuccessful case */ 547 /* The obviously unsuccessful case */
548 if (!good_pgpt && !good_agpt) 548 if (!good_pgpt && !good_agpt)
549 goto fail; 549 goto fail;
550 550
551 compare_gpts(pgpt, agpt, lastlba); 551 compare_gpts(pgpt, agpt, lastlba);
552 552
553 /* The good cases */ 553 /* The good cases */
554 if (good_pgpt) { 554 if (good_pgpt) {
555 *gpt = pgpt; 555 *gpt = pgpt;
556 *ptes = pptes; 556 *ptes = pptes;
557 kfree(agpt); 557 kfree(agpt);
558 kfree(aptes); 558 kfree(aptes);
559 if (!good_agpt) { 559 if (!good_agpt) {
560 printk(KERN_WARNING 560 printk(KERN_WARNING
561 "Alternate GPT 561 "Alternate GPT is invalid, "
562 "using primary 562 "using primary GPT.\n");
563 } 563 }
564 return 1; 564 return 1;
565 } 565 }
566 else if (good_agpt) { 566 else if (good_agpt) {
567 *gpt = agpt; 567 *gpt = agpt;
568 *ptes = aptes; 568 *ptes = aptes;
569 kfree(pgpt); 569 kfree(pgpt);
570 kfree(pptes); 570 kfree(pptes);
571 printk(KERN_WARNING 571 printk(KERN_WARNING
572 "Primary GPT is invalid 572 "Primary GPT is invalid, using alternate GPT.\n");
573 return 1; 573 return 1;
574 } 574 }
575 575
576 fail: 576 fail:
577 kfree(pgpt); 577 kfree(pgpt);
578 kfree(agpt); 578 kfree(agpt);
579 kfree(pptes); 579 kfree(pptes);
580 kfree(aptes); 580 kfree(aptes);
581 *gpt = NULL; 581 *gpt = NULL;
582 *ptes = NULL; 582 *ptes = NULL;
583 return 0; 583 return 0;
584 } 584 }
585 585
586 /** 586 /**
587 * efi_partition(struct parsed_partitions *sta 587 * efi_partition(struct parsed_partitions *state, struct block_device *bdev)
588 * @state 588 * @state
589 * @bdev 589 * @bdev
590 * 590 *
591 * Description: called from check.c, if the di 591 * Description: called from check.c, if the disk contains GPT
592 * partitions, sets up partition entries in th 592 * partitions, sets up partition entries in the kernel.
593 * 593 *
594 * If the first block on the disk is a legacy 594 * If the first block on the disk is a legacy MBR,
595 * it will get handled by msdos_partition(). 595 * it will get handled by msdos_partition().
596 * If it's a Protective MBR, we'll handle it h 596 * If it's a Protective MBR, we'll handle it here.
597 * 597 *
598 * We do not create a Linux partition for GPT, 598 * We do not create a Linux partition for GPT, but
599 * only for the actual data partitions. 599 * only for the actual data partitions.
600 * Returns: 600 * Returns:
601 * -1 if unable to read the partition table 601 * -1 if unable to read the partition table
602 * 0 if this isn't our partition table 602 * 0 if this isn't our partition table
603 * 1 if successful 603 * 1 if successful
604 * 604 *
605 */ 605 */
606 int 606 int
607 efi_partition(struct parsed_partitions *state, 607 efi_partition(struct parsed_partitions *state, struct block_device *bdev)
608 { 608 {
609 gpt_header *gpt = NULL; 609 gpt_header *gpt = NULL;
610 gpt_entry *ptes = NULL; 610 gpt_entry *ptes = NULL;
611 u32 i; 611 u32 i;
612 612
613 if (!find_valid_gpt(bdev, &gpt, &ptes) 613 if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) {
614 kfree(gpt); 614 kfree(gpt);
615 kfree(ptes); 615 kfree(ptes);
616 return 0; 616 return 0;
617 } 617 }
618 618
619 Dprintk("GUID Partition Table is valid 619 Dprintk("GUID Partition Table is valid! Yea!\n");
620 620
621 for (i = 0; i < le32_to_cpu(gpt->num_p 621 for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
622 if (!is_pte_valid(&ptes[i], la 622 if (!is_pte_valid(&ptes[i], last_lba(bdev)))
623 continue; 623 continue;
624 624
625 put_partition(state, i+1, le64 625 put_partition(state, i+1, le64_to_cpu(ptes[i].starting_lba),
626 (le64_to_cpu( 626 (le64_to_cpu(ptes[i].ending_lba) -
627 le64_to_cpu( 627 le64_to_cpu(ptes[i].starting_lba) +
628 1ULL)); 628 1ULL));
629 629
630 /* If this is a RAID volume, t 630 /* If this is a RAID volume, tell md */
631 if (!efi_guidcmp(ptes[i].parti 631 if (!efi_guidcmp(ptes[i].partition_type_guid,
632 PARTITION_LIN 632 PARTITION_LINUX_RAID_GUID))
633 state->parts[i+1].flag 633 state->parts[i+1].flags = 1;
634 } 634 }
635 kfree(ptes); 635 kfree(ptes);
636 kfree(gpt); 636 kfree(gpt);
637 printk("\n"); 637 printk("\n");
638 return 1; 638 return 1;
639 } 639 }
640 640
|
This page was automatically generated by the
LXR engine.
|