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1 /********************************************* 1 /************************************************************
2 * EFI GUID Partition Table handling 2 * EFI GUID Partition Table handling
3 * Per Intel EFI Specification v1.02 !! 3 *
4 * http://developer.intel.com/technology/efi/e !! 4 * http://www.uefi.org/specs/
>> 5 * http://www.intel.com/technology/efi/
>> 6 *
5 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.c 7 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
6 * Copyright 2000,2001,2002,2004 Dell Inc. 8 * Copyright 2000,2001,2002,2004 Dell Inc.
7 * 9 *
8 * This program is free software; you can red 10 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Publ 11 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either versi 12 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 13 * (at your option) any later version.
12 * 14 *
13 * This program is distributed in the hope th 15 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULA 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more detail 18 * GNU General Public License for more details.
17 * 19 *
18 * You should have received a copy of the GNU 20 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to 21 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 3 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * 23 *
22 * 24 *
23 * TODO: 25 * TODO:
24 * 26 *
25 * Changelog: 27 * Changelog:
26 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@de 28 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
27 * - test for valid PMBR and valid PGPT before 29 * - test for valid PMBR and valid PGPT before ever reading
28 * AGPT, allow override with 'gpt' kernel co 30 * AGPT, allow override with 'gpt' kernel command line option.
29 * - check for first/last_usable_lba outside o 31 * - check for first/last_usable_lba outside of size of disk
30 * 32 *
31 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@d 33 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
32 * - Ported to 2.5.7-pre1 and 2.5.7-dj2 34 * - Ported to 2.5.7-pre1 and 2.5.7-dj2
33 * - Applied patch to avoid fault in alternate 35 * - Applied patch to avoid fault in alternate header handling
34 * - cleaned up find_valid_gpt 36 * - cleaned up find_valid_gpt
35 * - On-disk structure and copy in memory is * 37 * - On-disk structure and copy in memory is *always* LE now -
36 * swab fields as needed 38 * swab fields as needed
37 * - remove print_gpt_header() 39 * - remove print_gpt_header()
38 * - only use first max_p partition entries, t 40 * - only use first max_p partition entries, to keep the kernel minor number
39 * and partition numbers tied. 41 * and partition numbers tied.
40 * 42 *
41 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@d 43 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
42 * - Removed __PRIPTR_PREFIX - not being used 44 * - Removed __PRIPTR_PREFIX - not being used
43 * 45 *
44 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@d 46 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
45 * - Ported to 2.5.2-pre11 + library crc32 pat 47 * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
46 * 48 *
47 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@del 49 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
48 * - Added compare_gpts(). 50 * - Added compare_gpts().
49 * - moved le_efi_guid_to_cpus() back into thi 51 * - moved le_efi_guid_to_cpus() back into this file. GPT is the only
50 * thing that keeps EFI GUIDs on disk. 52 * thing that keeps EFI GUIDs on disk.
51 * - Changed gpt structure names and members t 53 * - Changed gpt structure names and members to be simpler and more Linux-like.
52 * 54 *
53 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@de 55 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
54 * - Removed CONFIG_DEVFS_VOLUMES_UUID code en 56 * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
55 * 57 *
56 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@de 58 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
57 * - Changed function comments to DocBook styl 59 * - Changed function comments to DocBook style per Andreas Dilger suggestion.
58 * 60 *
59 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@de 61 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
60 * - Change read_lba() to use the page cache p 62 * - Change read_lba() to use the page cache per Al Viro's work.
61 * - print u64s properly on all architectures 63 * - print u64s properly on all architectures
62 * - fixed debug_printk(), now Dprintk() 64 * - fixed debug_printk(), now Dprintk()
63 * 65 *
64 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@de 66 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
65 * - Style cleanups 67 * - Style cleanups
66 * - made most functions static 68 * - made most functions static
67 * - Endianness addition 69 * - Endianness addition
68 * - remove test for second alternate header, 70 * - remove test for second alternate header, as it's not per spec,
69 * and is unnecessary. There's now a method 71 * and is unnecessary. There's now a method to read/write the last
70 * sector of an odd-sized disk from user spa 72 * sector of an odd-sized disk from user space. No tools have ever
71 * been released which used this code, so it 73 * been released which used this code, so it's effectively dead.
72 * - Per Asit Mallick of Intel, added a test f 74 * - Per Asit Mallick of Intel, added a test for a valid PMBR.
73 * - Added kernel command line option 'gpt' to 75 * - Added kernel command line option 'gpt' to override valid PMBR test.
74 * 76 *
75 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@ 77 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
76 * - added devfs volume UUID support (/dev/vol 78 * - added devfs volume UUID support (/dev/volumes/uuids) for
77 * mounting file systems by the partition GU 79 * mounting file systems by the partition GUID.
78 * 80 *
79 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@de 81 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com>
80 * - Moved crc32() to linux/lib, added efi_crc 82 * - Moved crc32() to linux/lib, added efi_crc32().
81 * 83 *
82 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@de 84 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
83 * - Replaced Intel's CRC32 function with an e 85 * - Replaced Intel's CRC32 function with an equivalent
84 * non-license-restricted version. 86 * non-license-restricted version.
85 * 87 *
86 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@de 88 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
87 * - Fixed the last_lba() call to return the p 89 * - Fixed the last_lba() call to return the proper last block
88 * 90 *
89 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@de 91 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
90 * - Thanks to Andries Brouwer for his debuggi 92 * - Thanks to Andries Brouwer for his debugging assistance.
91 * - Code works, detects all the partitions. 93 * - Code works, detects all the partitions.
92 * 94 *
93 ********************************************* 95 ************************************************************/
94 #include <linux/crc32.h> 96 #include <linux/crc32.h>
>> 97 #include <linux/math64.h>
95 #include "check.h" 98 #include "check.h"
96 #include "efi.h" 99 #include "efi.h"
97 100
98 #undef EFI_DEBUG <<
99 #ifdef EFI_DEBUG <<
100 #define Dprintk(x...) printk(KERN_DEBUG x) <<
101 #else <<
102 #define Dprintk(x...) <<
103 #endif <<
104 <<
105 /* This allows a kernel command line option 'g 101 /* This allows a kernel command line option 'gpt' to override
106 * the test for invalid PMBR. Not __initdata 102 * the test for invalid PMBR. Not __initdata because reloading
107 * the partition tables happens after init too 103 * the partition tables happens after init too.
108 */ 104 */
109 static int force_gpt; 105 static int force_gpt;
110 static int __init 106 static int __init
111 force_gpt_fn(char *str) 107 force_gpt_fn(char *str)
112 { 108 {
113 force_gpt = 1; 109 force_gpt = 1;
114 return 1; 110 return 1;
115 } 111 }
116 __setup("gpt", force_gpt_fn); 112 __setup("gpt", force_gpt_fn);
117 113
118 114
119 /** 115 /**
120 * efi_crc32() - EFI version of crc32 function 116 * efi_crc32() - EFI version of crc32 function
121 * @buf: buffer to calculate crc32 of 117 * @buf: buffer to calculate crc32 of
122 * @len - length of buf 118 * @len - length of buf
123 * 119 *
124 * Description: Returns EFI-style CRC32 value 120 * Description: Returns EFI-style CRC32 value for @buf
125 * 121 *
126 * This function uses the little endian Ethern 122 * This function uses the little endian Ethernet polynomial
127 * but seeds the function with ~0, and xor's w 123 * but seeds the function with ~0, and xor's with ~0 at the end.
128 * Note, the EFI Specification, v1.02, has a r 124 * Note, the EFI Specification, v1.02, has a reference to
129 * Dr. Dobbs Journal, May 1994 (actually it's 125 * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
130 */ 126 */
131 static inline u32 127 static inline u32
132 efi_crc32(const void *buf, unsigned long len) 128 efi_crc32(const void *buf, unsigned long len)
133 { 129 {
134 return (crc32(~0L, buf, len) ^ ~0L); 130 return (crc32(~0L, buf, len) ^ ~0L);
135 } 131 }
136 132
137 /** 133 /**
138 * last_lba(): return number of last logical b 134 * last_lba(): return number of last logical block of device
139 * @bdev: block device 135 * @bdev: block device
140 * 136 *
141 * Description: Returns last LBA value on succ 137 * Description: Returns last LBA value on success, 0 on error.
142 * This is stored (by sd and ide-geometry) in 138 * This is stored (by sd and ide-geometry) in
143 * the part[0] entry for this disk, and is th 139 * the part[0] entry for this disk, and is the number of
144 * physical sectors available on the disk. 140 * physical sectors available on the disk.
145 */ 141 */
146 static u64 142 static u64
147 last_lba(struct block_device *bdev) 143 last_lba(struct block_device *bdev)
148 { 144 {
149 if (!bdev || !bdev->bd_inode) 145 if (!bdev || !bdev->bd_inode)
150 return 0; 146 return 0;
151 return (bdev->bd_inode->i_size >> 9) - !! 147 return div_u64(bdev->bd_inode->i_size,
>> 148 bdev_logical_block_size(bdev)) - 1ULL;
152 } 149 }
153 150
154 static inline int 151 static inline int
155 pmbr_part_valid(struct partition *part) 152 pmbr_part_valid(struct partition *part)
156 { 153 {
157 if (part->sys_ind == EFI_PMBR_OSTYPE_E 154 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
158 le32_to_cpu(part->start_sect) == 1 155 le32_to_cpu(part->start_sect) == 1UL)
159 return 1; 156 return 1;
160 return 0; 157 return 0;
161 } 158 }
162 159
163 /** 160 /**
164 * is_pmbr_valid(): test Protective MBR for va 161 * is_pmbr_valid(): test Protective MBR for validity
165 * @mbr: pointer to a legacy mbr structure 162 * @mbr: pointer to a legacy mbr structure
166 * 163 *
167 * Description: Returns 1 if PMBR is valid, 0 164 * Description: Returns 1 if PMBR is valid, 0 otherwise.
168 * Validity depends on two things: 165 * Validity depends on two things:
169 * 1) MSDOS signature is in the last two byte 166 * 1) MSDOS signature is in the last two bytes of the MBR
170 * 2) One partition of type 0xEE is found 167 * 2) One partition of type 0xEE is found
171 */ 168 */
172 static int 169 static int
173 is_pmbr_valid(legacy_mbr *mbr) 170 is_pmbr_valid(legacy_mbr *mbr)
174 { 171 {
175 int i; 172 int i;
176 if (!mbr || le16_to_cpu(mbr->signature 173 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
177 return 0; 174 return 0;
178 for (i = 0; i < 4; i++) 175 for (i = 0; i < 4; i++)
179 if (pmbr_part_valid(&mbr->part 176 if (pmbr_part_valid(&mbr->partition_record[i]))
180 return 1; 177 return 1;
181 return 0; 178 return 0;
182 } 179 }
183 180
184 /** 181 /**
185 * read_lba(): Read bytes from disk, starting 182 * read_lba(): Read bytes from disk, starting at given LBA
186 * @bdev 183 * @bdev
187 * @lba 184 * @lba
188 * @buffer 185 * @buffer
189 * @size_t 186 * @size_t
190 * 187 *
191 * Description: Reads @count bytes from @bdev 188 * Description: Reads @count bytes from @bdev into @buffer.
192 * Returns number of bytes read on success, 0 189 * Returns number of bytes read on success, 0 on error.
193 */ 190 */
194 static size_t 191 static size_t
195 read_lba(struct block_device *bdev, u64 lba, u 192 read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
196 { 193 {
197 size_t totalreadcount = 0; 194 size_t totalreadcount = 0;
>> 195 sector_t n = lba * (bdev_logical_block_size(bdev) / 512);
198 196
199 if (!bdev || !buffer || lba > last_lba 197 if (!bdev || !buffer || lba > last_lba(bdev))
200 return 0; 198 return 0;
201 199
202 while (count) { 200 while (count) {
203 int copied = 512; 201 int copied = 512;
204 Sector sect; 202 Sector sect;
205 unsigned char *data = read_dev !! 203 unsigned char *data = read_dev_sector(bdev, n++, §);
206 if (!data) 204 if (!data)
207 break; 205 break;
208 if (copied > count) 206 if (copied > count)
209 copied = count; 207 copied = count;
210 memcpy(buffer, data, copied); 208 memcpy(buffer, data, copied);
211 put_dev_sector(sect); 209 put_dev_sector(sect);
212 buffer += copied; 210 buffer += copied;
213 totalreadcount +=copied; 211 totalreadcount +=copied;
214 count -= copied; 212 count -= copied;
215 } 213 }
216 return totalreadcount; 214 return totalreadcount;
217 } 215 }
218 216
219 /** 217 /**
220 * alloc_read_gpt_entries(): reads partition e 218 * alloc_read_gpt_entries(): reads partition entries from disk
221 * @bdev 219 * @bdev
222 * @gpt - GPT header 220 * @gpt - GPT header
223 * 221 *
224 * Description: Returns ptes on success, NULL 222 * Description: Returns ptes on success, NULL on error.
225 * Allocates space for PTEs based on informati 223 * Allocates space for PTEs based on information found in @gpt.
226 * Notes: remember to free pte when you're don 224 * Notes: remember to free pte when you're done!
227 */ 225 */
228 static gpt_entry * 226 static gpt_entry *
229 alloc_read_gpt_entries(struct block_device *bd 227 alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
230 { 228 {
231 size_t count; 229 size_t count;
232 gpt_entry *pte; 230 gpt_entry *pte;
233 if (!bdev || !gpt) 231 if (!bdev || !gpt)
234 return NULL; 232 return NULL;
235 233
236 count = le32_to_cpu(gpt->num_partition 234 count = le32_to_cpu(gpt->num_partition_entries) *
237 le32_to_cpu(gpt->sizeof_partit 235 le32_to_cpu(gpt->sizeof_partition_entry);
238 if (!count) 236 if (!count)
239 return NULL; 237 return NULL;
240 pte = kzalloc(count, GFP_KERNEL); 238 pte = kzalloc(count, GFP_KERNEL);
241 if (!pte) 239 if (!pte)
242 return NULL; 240 return NULL;
243 241
244 if (read_lba(bdev, le64_to_cpu(gpt->pa 242 if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba),
245 (u8 *) pte, 243 (u8 *) pte,
246 count) < count) { 244 count) < count) {
247 kfree(pte); 245 kfree(pte);
248 pte=NULL; 246 pte=NULL;
249 return NULL; 247 return NULL;
250 } 248 }
251 return pte; 249 return pte;
252 } 250 }
253 251
254 /** 252 /**
255 * alloc_read_gpt_header(): Allocates GPT head 253 * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
256 * @bdev 254 * @bdev
257 * @lba is the Logical Block Address of the pa 255 * @lba is the Logical Block Address of the partition table
258 * 256 *
259 * Description: returns GPT header on success, 257 * Description: returns GPT header on success, NULL on error. Allocates
260 * and fills a GPT header starting at @ from @ 258 * and fills a GPT header starting at @ from @bdev.
261 * Note: remember to free gpt when finished wi 259 * Note: remember to free gpt when finished with it.
262 */ 260 */
263 static gpt_header * 261 static gpt_header *
264 alloc_read_gpt_header(struct block_device *bde 262 alloc_read_gpt_header(struct block_device *bdev, u64 lba)
265 { 263 {
266 gpt_header *gpt; 264 gpt_header *gpt;
>> 265 unsigned ssz = bdev_logical_block_size(bdev);
>> 266
267 if (!bdev) 267 if (!bdev)
268 return NULL; 268 return NULL;
269 269
270 gpt = kzalloc(sizeof (gpt_header), GFP !! 270 gpt = kzalloc(ssz, 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, ssz) < ssz) {
275 sizeof (gpt_header)) < si <<
276 kfree(gpt); 275 kfree(gpt);
277 gpt=NULL; 276 gpt=NULL;
278 return NULL; 277 return NULL;
279 } 278 }
280 279
281 return gpt; 280 return gpt;
282 } 281 }
283 282
284 /** 283 /**
285 * is_gpt_valid() - tests one GPT header and P 284 * is_gpt_valid() - tests one GPT header and PTEs for validity
286 * @bdev 285 * @bdev
287 * @lba is the logical block address of the GP 286 * @lba is the logical block address of the GPT header to test
288 * @gpt is a GPT header ptr, filled on return. 287 * @gpt is a GPT header ptr, filled on return.
289 * @ptes is a PTEs ptr, filled on return. 288 * @ptes is a PTEs ptr, filled on return.
290 * 289 *
291 * Description: returns 1 if valid, 0 on erro 290 * Description: returns 1 if valid, 0 on error.
292 * If valid, returns pointers to newly allocat 291 * If valid, returns pointers to newly allocated GPT header and PTEs.
293 */ 292 */
294 static int 293 static int
295 is_gpt_valid(struct block_device *bdev, u64 lb 294 is_gpt_valid(struct block_device *bdev, u64 lba,
296 gpt_header **gpt, gpt_entry **pte 295 gpt_header **gpt, gpt_entry **ptes)
297 { 296 {
298 u32 crc, origcrc; 297 u32 crc, origcrc;
299 u64 lastlba; 298 u64 lastlba;
300 299
301 if (!bdev || !gpt || !ptes) 300 if (!bdev || !gpt || !ptes)
302 return 0; 301 return 0;
303 if (!(*gpt = alloc_read_gpt_header(bde 302 if (!(*gpt = alloc_read_gpt_header(bdev, lba)))
304 return 0; 303 return 0;
305 304
306 /* Check the GUID Partition Table sign 305 /* Check the GUID Partition Table signature */
307 if (le64_to_cpu((*gpt)->signature) != 306 if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
308 Dprintk("GUID Partition Table !! 307 pr_debug("GUID Partition Table Header signature is wrong:"
309 "%lld != %lld\n", !! 308 "%lld != %lld\n",
310 (unsigned long long)le !! 309 (unsigned long long)le64_to_cpu((*gpt)->signature),
311 (unsigned long long)GP !! 310 (unsigned long long)GPT_HEADER_SIGNATURE);
312 goto fail; 311 goto fail;
313 } 312 }
314 313
315 /* Check the GUID Partition Table CRC 314 /* Check the GUID Partition Table CRC */
316 origcrc = le32_to_cpu((*gpt)->header_c 315 origcrc = le32_to_cpu((*gpt)->header_crc32);
317 (*gpt)->header_crc32 = 0; 316 (*gpt)->header_crc32 = 0;
318 crc = efi_crc32((const unsigned char * 317 crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
319 318
320 if (crc != origcrc) { 319 if (crc != origcrc) {
321 Dprintk !! 320 pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n",
322 ("GUID Partition Table Hea !! 321 crc, origcrc);
323 crc, origcrc); <<
324 goto fail; 322 goto fail;
325 } 323 }
326 (*gpt)->header_crc32 = cpu_to_le32(ori 324 (*gpt)->header_crc32 = cpu_to_le32(origcrc);
327 325
328 /* Check that the my_lba entry points 326 /* Check that the my_lba entry points to the LBA that contains
329 * the GUID Partition Table */ 327 * the GUID Partition Table */
330 if (le64_to_cpu((*gpt)->my_lba) != lba 328 if (le64_to_cpu((*gpt)->my_lba) != lba) {
331 Dprintk("GPT my_lba incorrect: !! 329 pr_debug("GPT my_lba incorrect: %lld != %lld\n",
332 (unsigned long long)le !! 330 (unsigned long long)le64_to_cpu((*gpt)->my_lba),
333 (unsigned long long)lb !! 331 (unsigned long long)lba);
334 goto fail; 332 goto fail;
335 } 333 }
336 334
337 /* Check the first_usable_lba and last 335 /* Check the first_usable_lba and last_usable_lba are
338 * within the disk. 336 * within the disk.
339 */ 337 */
340 lastlba = last_lba(bdev); 338 lastlba = last_lba(bdev);
341 if (le64_to_cpu((*gpt)->first_usable_l 339 if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
342 Dprintk("GPT: first_usable_lba !! 340 pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
343 (unsigned long long)le !! 341 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
344 (unsigned long long)la !! 342 (unsigned long long)lastlba);
345 goto fail; 343 goto fail;
346 } 344 }
347 if (le64_to_cpu((*gpt)->last_usable_lb 345 if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
348 Dprintk("GPT: last_usable_lba !! 346 pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
349 (unsigned long long)le !! 347 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
350 (unsigned long long)la !! 348 (unsigned long long)lastlba);
351 goto fail; 349 goto fail;
352 } 350 }
353 351
354 if (!(*ptes = alloc_read_gpt_entries(b 352 if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
355 goto fail; 353 goto fail;
356 354
357 /* Check the GUID Partition Entry Arra 355 /* Check the GUID Partition Entry Array CRC */
358 crc = efi_crc32((const unsigned char * 356 crc = efi_crc32((const unsigned char *) (*ptes),
359 le32_to_cpu((*gpt)->nu 357 le32_to_cpu((*gpt)->num_partition_entries) *
360 le32_to_cpu((*gpt)->si 358 le32_to_cpu((*gpt)->sizeof_partition_entry));
361 359
362 if (crc != le32_to_cpu((*gpt)->partiti 360 if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
363 Dprintk("GUID Partitition Entr !! 361 pr_debug("GUID Partitition Entry Array CRC check failed.\n");
364 goto fail_ptes; 362 goto fail_ptes;
365 } 363 }
366 364
367 /* We're done, all's well */ 365 /* We're done, all's well */
368 return 1; 366 return 1;
369 367
370 fail_ptes: 368 fail_ptes:
371 kfree(*ptes); 369 kfree(*ptes);
372 *ptes = NULL; 370 *ptes = NULL;
373 fail: 371 fail:
374 kfree(*gpt); 372 kfree(*gpt);
375 *gpt = NULL; 373 *gpt = NULL;
376 return 0; 374 return 0;
377 } 375 }
378 376
379 /** 377 /**
380 * is_pte_valid() - tests one PTE for validity 378 * is_pte_valid() - tests one PTE for validity
381 * @pte is the pte to check 379 * @pte is the pte to check
382 * @lastlba is last lba of the disk 380 * @lastlba is last lba of the disk
383 * 381 *
384 * Description: returns 1 if valid, 0 on erro 382 * Description: returns 1 if valid, 0 on error.
385 */ 383 */
386 static inline int 384 static inline int
387 is_pte_valid(const gpt_entry *pte, const u64 l 385 is_pte_valid(const gpt_entry *pte, const u64 lastlba)
388 { 386 {
389 if ((!efi_guidcmp(pte->partition_type_ 387 if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
390 le64_to_cpu(pte->starting_lba) > l 388 le64_to_cpu(pte->starting_lba) > lastlba ||
391 le64_to_cpu(pte->ending_lba) > l 389 le64_to_cpu(pte->ending_lba) > lastlba)
392 return 0; 390 return 0;
393 return 1; 391 return 1;
394 } 392 }
395 393
396 /** 394 /**
397 * compare_gpts() - Search disk for valid GPT 395 * compare_gpts() - Search disk for valid GPT headers and PTEs
398 * @pgpt is the primary GPT header 396 * @pgpt is the primary GPT header
399 * @agpt is the alternate GPT header 397 * @agpt is the alternate GPT header
400 * @lastlba is the last LBA number 398 * @lastlba is the last LBA number
401 * Description: Returns nothing. Sanity check 399 * Description: Returns nothing. Sanity checks pgpt and agpt fields
402 * and prints warnings on discrepancies. 400 * and prints warnings on discrepancies.
403 * 401 *
404 */ 402 */
405 static void 403 static void
406 compare_gpts(gpt_header *pgpt, gpt_header *agp 404 compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
407 { 405 {
408 int error_found = 0; 406 int error_found = 0;
409 if (!pgpt || !agpt) 407 if (!pgpt || !agpt)
410 return; 408 return;
411 if (le64_to_cpu(pgpt->my_lba) != le64_ 409 if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
412 printk(KERN_WARNING 410 printk(KERN_WARNING
413 "GPT:Primary header LBA 411 "GPT:Primary header LBA != Alt. header alternate_lba\n");
414 printk(KERN_WARNING "GPT:%lld 412 printk(KERN_WARNING "GPT:%lld != %lld\n",
415 (unsigned long long)le6 413 (unsigned long long)le64_to_cpu(pgpt->my_lba),
416 (unsigned long long)le6 414 (unsigned long long)le64_to_cpu(agpt->alternate_lba));
417 error_found++; 415 error_found++;
418 } 416 }
419 if (le64_to_cpu(pgpt->alternate_lba) ! 417 if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
420 printk(KERN_WARNING 418 printk(KERN_WARNING
421 "GPT:Primary header alt 419 "GPT:Primary header alternate_lba != Alt. header my_lba\n");
422 printk(KERN_WARNING "GPT:%lld 420 printk(KERN_WARNING "GPT:%lld != %lld\n",
423 (unsigned long long)le6 421 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
424 (unsigned long long)le6 422 (unsigned long long)le64_to_cpu(agpt->my_lba));
425 error_found++; 423 error_found++;
426 } 424 }
427 if (le64_to_cpu(pgpt->first_usable_lba 425 if (le64_to_cpu(pgpt->first_usable_lba) !=
428 le64_to_cpu(agpt->first_usable_lba 426 le64_to_cpu(agpt->first_usable_lba)) {
429 printk(KERN_WARNING "GPT:first 427 printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
430 printk(KERN_WARNING "GPT:%lld 428 printk(KERN_WARNING "GPT:%lld != %lld\n",
431 (unsigned long long)le6 429 (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
432 (unsigned long long)le6 430 (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
433 error_found++; 431 error_found++;
434 } 432 }
435 if (le64_to_cpu(pgpt->last_usable_lba) 433 if (le64_to_cpu(pgpt->last_usable_lba) !=
436 le64_to_cpu(agpt->last_usable_lba) 434 le64_to_cpu(agpt->last_usable_lba)) {
437 printk(KERN_WARNING "GPT:last_ 435 printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
438 printk(KERN_WARNING "GPT:%lld 436 printk(KERN_WARNING "GPT:%lld != %lld\n",
439 (unsigned long long)le6 437 (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
440 (unsigned long long)le6 438 (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
441 error_found++; 439 error_found++;
442 } 440 }
443 if (efi_guidcmp(pgpt->disk_guid, agpt- 441 if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
444 printk(KERN_WARNING "GPT:disk_ 442 printk(KERN_WARNING "GPT:disk_guids don't match.\n");
445 error_found++; 443 error_found++;
446 } 444 }
447 if (le32_to_cpu(pgpt->num_partition_en 445 if (le32_to_cpu(pgpt->num_partition_entries) !=
448 le32_to_cpu(agpt->num_partition_en 446 le32_to_cpu(agpt->num_partition_entries)) {
449 printk(KERN_WARNING "GPT:num_p 447 printk(KERN_WARNING "GPT:num_partition_entries don't match: "
450 "0x%x != 0x%x\n", 448 "0x%x != 0x%x\n",
451 le32_to_cpu(pgpt->num_p 449 le32_to_cpu(pgpt->num_partition_entries),
452 le32_to_cpu(agpt->num_p 450 le32_to_cpu(agpt->num_partition_entries));
453 error_found++; 451 error_found++;
454 } 452 }
455 if (le32_to_cpu(pgpt->sizeof_partition 453 if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
456 le32_to_cpu(agpt->sizeof_partition 454 le32_to_cpu(agpt->sizeof_partition_entry)) {
457 printk(KERN_WARNING 455 printk(KERN_WARNING
458 "GPT:sizeof_partition_e 456 "GPT:sizeof_partition_entry values don't match: "
459 "0x%x != 0x%x\n", 457 "0x%x != 0x%x\n",
460 le32_to_cpu(pgpt->sizeo 458 le32_to_cpu(pgpt->sizeof_partition_entry),
461 le32_to_cpu(agpt->sizeo 459 le32_to_cpu(agpt->sizeof_partition_entry));
462 error_found++; 460 error_found++;
463 } 461 }
464 if (le32_to_cpu(pgpt->partition_entry_ 462 if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
465 le32_to_cpu(agpt->partition_entry_ 463 le32_to_cpu(agpt->partition_entry_array_crc32)) {
466 printk(KERN_WARNING 464 printk(KERN_WARNING
467 "GPT:partition_entry_ar 465 "GPT:partition_entry_array_crc32 values don't match: "
468 "0x%x != 0x%x\n", 466 "0x%x != 0x%x\n",
469 le32_to_cpu(pgpt->parti 467 le32_to_cpu(pgpt->partition_entry_array_crc32),
470 le32_to_cpu(agpt->parti 468 le32_to_cpu(agpt->partition_entry_array_crc32));
471 error_found++; 469 error_found++;
472 } 470 }
473 if (le64_to_cpu(pgpt->alternate_lba) ! 471 if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
474 printk(KERN_WARNING 472 printk(KERN_WARNING
475 "GPT:Primary header thi 473 "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
476 printk(KERN_WARNING "GPT:%lld 474 printk(KERN_WARNING "GPT:%lld != %lld\n",
477 (unsigned long long)le 475 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
478 (unsigned long long)la 476 (unsigned long long)lastlba);
479 error_found++; 477 error_found++;
480 } 478 }
481 479
482 if (le64_to_cpu(agpt->my_lba) != lastl 480 if (le64_to_cpu(agpt->my_lba) != lastlba) {
483 printk(KERN_WARNING 481 printk(KERN_WARNING
484 "GPT:Alternate GPT head 482 "GPT:Alternate GPT header not at the end of the disk.\n");
485 printk(KERN_WARNING "GPT:%lld 483 printk(KERN_WARNING "GPT:%lld != %lld\n",
486 (unsigned long long)le 484 (unsigned long long)le64_to_cpu(agpt->my_lba),
487 (unsigned long long)la 485 (unsigned long long)lastlba);
488 error_found++; 486 error_found++;
489 } 487 }
490 488
491 if (error_found) 489 if (error_found)
492 printk(KERN_WARNING 490 printk(KERN_WARNING
493 "GPT: Use GNU Parted to 491 "GPT: Use GNU Parted to correct GPT errors.\n");
494 return; 492 return;
495 } 493 }
496 494
497 /** 495 /**
498 * find_valid_gpt() - Search disk for valid GP 496 * find_valid_gpt() - Search disk for valid GPT headers and PTEs
499 * @bdev 497 * @bdev
500 * @gpt is a GPT header ptr, filled on return. 498 * @gpt is a GPT header ptr, filled on return.
501 * @ptes is a PTEs ptr, filled on return. 499 * @ptes is a PTEs ptr, filled on return.
502 * Description: Returns 1 if valid, 0 on error 500 * Description: Returns 1 if valid, 0 on error.
503 * If valid, returns pointers to newly allocat 501 * If valid, returns pointers to newly allocated GPT header and PTEs.
504 * Validity depends on PMBR being valid (or be 502 * Validity depends on PMBR being valid (or being overridden by the
505 * 'gpt' kernel command line option) and findi 503 * 'gpt' kernel command line option) and finding either the Primary
506 * GPT header and PTEs valid, or the Alternate 504 * GPT header and PTEs valid, or the Alternate GPT header and PTEs
507 * valid. If the Primary GPT header is not va 505 * valid. If the Primary GPT header is not valid, the Alternate GPT header
508 * is not checked unless the 'gpt' kernel comm 506 * is not checked unless the 'gpt' kernel command line option is passed.
509 * This protects against devices which misrepo 507 * This protects against devices which misreport their size, and forces
510 * the user to decide to use the Alternate GPT 508 * the user to decide to use the Alternate GPT.
511 */ 509 */
512 static int 510 static int
513 find_valid_gpt(struct block_device *bdev, gpt_ 511 find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
514 { 512 {
515 int good_pgpt = 0, good_agpt = 0, good 513 int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
516 gpt_header *pgpt = NULL, *agpt = NULL; 514 gpt_header *pgpt = NULL, *agpt = NULL;
517 gpt_entry *pptes = NULL, *aptes = NULL 515 gpt_entry *pptes = NULL, *aptes = NULL;
518 legacy_mbr *legacymbr; 516 legacy_mbr *legacymbr;
519 u64 lastlba; 517 u64 lastlba;
520 if (!bdev || !gpt || !ptes) 518 if (!bdev || !gpt || !ptes)
521 return 0; 519 return 0;
522 520
523 lastlba = last_lba(bdev); 521 lastlba = last_lba(bdev);
524 if (!force_gpt) { 522 if (!force_gpt) {
525 /* This will be added to the E 523 /* This will be added to the EFI Spec. per Intel after v1.02. */
526 legacymbr = kzalloc(sizeof (*l 524 legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
527 if (legacymbr) { 525 if (legacymbr) {
528 read_lba(bdev, 0, (u8 526 read_lba(bdev, 0, (u8 *) legacymbr,
529 sizeof (*lega 527 sizeof (*legacymbr));
530 good_pmbr = is_pmbr_va 528 good_pmbr = is_pmbr_valid(legacymbr);
531 kfree(legacymbr); 529 kfree(legacymbr);
532 } 530 }
533 if (!good_pmbr) 531 if (!good_pmbr)
534 goto fail; 532 goto fail;
535 } 533 }
536 534
537 good_pgpt = is_gpt_valid(bdev, GPT_PRI 535 good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA,
538 &pgpt, &pptes 536 &pgpt, &pptes);
539 if (good_pgpt) 537 if (good_pgpt)
540 good_agpt = is_gpt_valid(bdev, 538 good_agpt = is_gpt_valid(bdev,
541 le64_ 539 le64_to_cpu(pgpt->alternate_lba),
542 &agpt 540 &agpt, &aptes);
543 if (!good_agpt && force_gpt) 541 if (!good_agpt && force_gpt)
544 good_agpt = is_gpt_valid(bdev, 542 good_agpt = is_gpt_valid(bdev, lastlba,
545 &agpt 543 &agpt, &aptes);
546 544
547 /* The obviously unsuccessful case */ 545 /* The obviously unsuccessful case */
548 if (!good_pgpt && !good_agpt) 546 if (!good_pgpt && !good_agpt)
549 goto fail; 547 goto fail;
550 548
551 compare_gpts(pgpt, agpt, lastlba); 549 compare_gpts(pgpt, agpt, lastlba);
552 550
553 /* The good cases */ 551 /* The good cases */
554 if (good_pgpt) { 552 if (good_pgpt) {
555 *gpt = pgpt; 553 *gpt = pgpt;
556 *ptes = pptes; 554 *ptes = pptes;
557 kfree(agpt); 555 kfree(agpt);
558 kfree(aptes); 556 kfree(aptes);
559 if (!good_agpt) { 557 if (!good_agpt) {
560 printk(KERN_WARNING 558 printk(KERN_WARNING
561 "Alternate GPT 559 "Alternate GPT is invalid, "
562 "using primary 560 "using primary GPT.\n");
563 } 561 }
564 return 1; 562 return 1;
565 } 563 }
566 else if (good_agpt) { 564 else if (good_agpt) {
567 *gpt = agpt; 565 *gpt = agpt;
568 *ptes = aptes; 566 *ptes = aptes;
569 kfree(pgpt); 567 kfree(pgpt);
570 kfree(pptes); 568 kfree(pptes);
571 printk(KERN_WARNING 569 printk(KERN_WARNING
572 "Primary GPT is invalid 570 "Primary GPT is invalid, using alternate GPT.\n");
573 return 1; 571 return 1;
574 } 572 }
575 573
576 fail: 574 fail:
577 kfree(pgpt); 575 kfree(pgpt);
578 kfree(agpt); 576 kfree(agpt);
579 kfree(pptes); 577 kfree(pptes);
580 kfree(aptes); 578 kfree(aptes);
581 *gpt = NULL; 579 *gpt = NULL;
582 *ptes = NULL; 580 *ptes = NULL;
583 return 0; 581 return 0;
584 } 582 }
585 583
586 /** 584 /**
587 * efi_partition(struct parsed_partitions *sta 585 * efi_partition(struct parsed_partitions *state, struct block_device *bdev)
588 * @state 586 * @state
589 * @bdev 587 * @bdev
590 * 588 *
591 * Description: called from check.c, if the di 589 * Description: called from check.c, if the disk contains GPT
592 * partitions, sets up partition entries in th 590 * partitions, sets up partition entries in the kernel.
593 * 591 *
594 * If the first block on the disk is a legacy 592 * If the first block on the disk is a legacy MBR,
595 * it will get handled by msdos_partition(). 593 * it will get handled by msdos_partition().
596 * If it's a Protective MBR, we'll handle it h 594 * If it's a Protective MBR, we'll handle it here.
597 * 595 *
598 * We do not create a Linux partition for GPT, 596 * We do not create a Linux partition for GPT, but
599 * only for the actual data partitions. 597 * only for the actual data partitions.
600 * Returns: 598 * Returns:
601 * -1 if unable to read the partition table 599 * -1 if unable to read the partition table
602 * 0 if this isn't our partition table 600 * 0 if this isn't our partition table
603 * 1 if successful 601 * 1 if successful
604 * 602 *
605 */ 603 */
606 int 604 int
607 efi_partition(struct parsed_partitions *state, 605 efi_partition(struct parsed_partitions *state, struct block_device *bdev)
608 { 606 {
609 gpt_header *gpt = NULL; 607 gpt_header *gpt = NULL;
610 gpt_entry *ptes = NULL; 608 gpt_entry *ptes = NULL;
611 u32 i; 609 u32 i;
>> 610 unsigned ssz = bdev_logical_block_size(bdev) / 512;
612 611
613 if (!find_valid_gpt(bdev, &gpt, &ptes) 612 if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) {
614 kfree(gpt); 613 kfree(gpt);
615 kfree(ptes); 614 kfree(ptes);
616 return 0; 615 return 0;
617 } 616 }
618 617
619 Dprintk("GUID Partition Table is valid !! 618 pr_debug("GUID Partition Table is valid! Yea!\n");
620 619
621 for (i = 0; i < le32_to_cpu(gpt->num_p 620 for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
>> 621 u64 start = le64_to_cpu(ptes[i].starting_lba);
>> 622 u64 size = le64_to_cpu(ptes[i].ending_lba) -
>> 623 le64_to_cpu(ptes[i].starting_lba) + 1ULL;
>> 624
622 if (!is_pte_valid(&ptes[i], la 625 if (!is_pte_valid(&ptes[i], last_lba(bdev)))
623 continue; 626 continue;
624 627
625 put_partition(state, i+1, le64 !! 628 put_partition(state, i+1, start * ssz, size * ssz);
626 (le64_to_cpu( <<
627 le64_to_cpu( <<
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
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