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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * misc.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Miscellaneous routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
1da177e4 LT |
7 | * COPYRIGHT |
8 | * This file is distributed under the terms of the GNU General Public | |
9 | * License (GPL). Copies of the GPL can be obtained from: | |
10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
11 | * Each contributing author retains all rights to their own work. | |
12 | * | |
13 | * (C) 1998 Dave Boynton | |
14 | * (C) 1998-2004 Ben Fennema | |
15 | * (C) 1999-2000 Stelias Computing Inc | |
16 | * | |
17 | * HISTORY | |
18 | * | |
19 | * 04/19/99 blf partial support for reading/writing specific EA's | |
20 | */ | |
21 | ||
22 | #include "udfdecl.h" | |
23 | ||
24 | #include <linux/fs.h> | |
25 | #include <linux/string.h> | |
f845fced | 26 | #include <linux/crc-itu-t.h> |
1da177e4 LT |
27 | |
28 | #include "udf_i.h" | |
29 | #include "udf_sb.h" | |
30 | ||
cb00ea35 | 31 | struct buffer_head *udf_tgetblk(struct super_block *sb, int block) |
1da177e4 LT |
32 | { |
33 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) | |
34 | return sb_getblk(sb, udf_fixed_to_variable(block)); | |
35 | else | |
36 | return sb_getblk(sb, block); | |
37 | } | |
38 | ||
cb00ea35 | 39 | struct buffer_head *udf_tread(struct super_block *sb, int block) |
1da177e4 LT |
40 | { |
41 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) | |
42 | return sb_bread(sb, udf_fixed_to_variable(block)); | |
43 | else | |
44 | return sb_bread(sb, block); | |
45 | } | |
46 | ||
cb00ea35 CG |
47 | struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size, |
48 | uint32_t type, uint8_t loc) | |
1da177e4 LT |
49 | { |
50 | uint8_t *ea = NULL, *ad = NULL; | |
51 | int offset; | |
52 | uint16_t crclen; | |
48d6d8ff | 53 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 54 | |
48d6d8ff MS |
55 | ea = iinfo->i_ext.i_data; |
56 | if (iinfo->i_lenEAttr) { | |
57 | ad = iinfo->i_ext.i_data + iinfo->i_lenEAttr; | |
28de7948 | 58 | } else { |
1da177e4 LT |
59 | ad = ea; |
60 | size += sizeof(struct extendedAttrHeaderDesc); | |
61 | } | |
62 | ||
63 | offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - | |
48d6d8ff | 64 | iinfo->i_lenAlloc; |
1da177e4 LT |
65 | |
66 | /* TODO - Check for FreeEASpace */ | |
67 | ||
cb00ea35 | 68 | if (loc & 0x01 && offset >= size) { |
1da177e4 LT |
69 | struct extendedAttrHeaderDesc *eahd; |
70 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
71 | ||
48d6d8ff MS |
72 | if (iinfo->i_lenAlloc) |
73 | memmove(&ad[size], ad, iinfo->i_lenAlloc); | |
1da177e4 | 74 | |
48d6d8ff | 75 | if (iinfo->i_lenEAttr) { |
1da177e4 | 76 | /* check checksum/crc */ |
5e0f0017 MS |
77 | if (eahd->descTag.tagIdent != |
78 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 79 | le32_to_cpu(eahd->descTag.tagLocation) != |
48d6d8ff | 80 | iinfo->i_location.logicalBlockNum) |
1da177e4 | 81 | return NULL; |
cb00ea35 | 82 | } else { |
6c79e987 MS |
83 | struct udf_sb_info *sbi = UDF_SB(inode->i_sb); |
84 | ||
1da177e4 | 85 | size -= sizeof(struct extendedAttrHeaderDesc); |
48d6d8ff | 86 | iinfo->i_lenEAttr += |
4b11111a | 87 | sizeof(struct extendedAttrHeaderDesc); |
1da177e4 | 88 | eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); |
6c79e987 | 89 | if (sbi->s_udfrev >= 0x0200) |
1da177e4 LT |
90 | eahd->descTag.descVersion = cpu_to_le16(3); |
91 | else | |
92 | eahd->descTag.descVersion = cpu_to_le16(2); | |
4b11111a MS |
93 | eahd->descTag.tagSerialNum = |
94 | cpu_to_le16(sbi->s_serial_number); | |
95 | eahd->descTag.tagLocation = cpu_to_le32( | |
48d6d8ff | 96 | iinfo->i_location.logicalBlockNum); |
1da177e4 LT |
97 | eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); |
98 | eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); | |
99 | } | |
100 | ||
48d6d8ff | 101 | offset = iinfo->i_lenEAttr; |
cb00ea35 | 102 | if (type < 2048) { |
4b11111a | 103 | if (le32_to_cpu(eahd->appAttrLocation) < |
48d6d8ff | 104 | iinfo->i_lenEAttr) { |
4b11111a MS |
105 | uint32_t aal = |
106 | le32_to_cpu(eahd->appAttrLocation); | |
ce8861e5 ER |
107 | |
108 | osb(); | |
28de7948 CG |
109 | memmove(&ea[offset - aal + size], |
110 | &ea[aal], offset - aal); | |
1da177e4 | 111 | offset -= aal; |
4b11111a MS |
112 | eahd->appAttrLocation = |
113 | cpu_to_le32(aal + size); | |
1da177e4 | 114 | } |
4b11111a | 115 | if (le32_to_cpu(eahd->impAttrLocation) < |
48d6d8ff | 116 | iinfo->i_lenEAttr) { |
4b11111a MS |
117 | uint32_t ial = |
118 | le32_to_cpu(eahd->impAttrLocation); | |
ce8861e5 ER |
119 | |
120 | osb(); | |
28de7948 CG |
121 | memmove(&ea[offset - ial + size], |
122 | &ea[ial], offset - ial); | |
1da177e4 | 123 | offset -= ial; |
4b11111a MS |
124 | eahd->impAttrLocation = |
125 | cpu_to_le32(ial + size); | |
1da177e4 | 126 | } |
cb00ea35 | 127 | } else if (type < 65536) { |
4b11111a | 128 | if (le32_to_cpu(eahd->appAttrLocation) < |
48d6d8ff | 129 | iinfo->i_lenEAttr) { |
4b11111a MS |
130 | uint32_t aal = |
131 | le32_to_cpu(eahd->appAttrLocation); | |
ce8861e5 ER |
132 | |
133 | osb(); | |
28de7948 CG |
134 | memmove(&ea[offset - aal + size], |
135 | &ea[aal], offset - aal); | |
1da177e4 | 136 | offset -= aal; |
4b11111a MS |
137 | eahd->appAttrLocation = |
138 | cpu_to_le32(aal + size); | |
1da177e4 LT |
139 | } |
140 | } | |
141 | /* rewrite CRC + checksum of eahd */ | |
5ca4e4be | 142 | crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(struct tag); |
1da177e4 | 143 | eahd->descTag.descCRCLength = cpu_to_le16(crclen); |
f845fced | 144 | eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd + |
5ca4e4be | 145 | sizeof(struct tag), crclen)); |
3f2587bb | 146 | eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); |
48d6d8ff | 147 | iinfo->i_lenEAttr += size; |
1da177e4 LT |
148 | return (struct genericFormat *)&ea[offset]; |
149 | } | |
28de7948 | 150 | |
1da177e4 LT |
151 | return NULL; |
152 | } | |
153 | ||
cb00ea35 CG |
154 | struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, |
155 | uint8_t subtype) | |
1da177e4 LT |
156 | { |
157 | struct genericFormat *gaf; | |
158 | uint8_t *ea = NULL; | |
159 | uint32_t offset; | |
48d6d8ff | 160 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 161 | |
48d6d8ff | 162 | ea = iinfo->i_ext.i_data; |
1da177e4 | 163 | |
48d6d8ff | 164 | if (iinfo->i_lenEAttr) { |
1da177e4 LT |
165 | struct extendedAttrHeaderDesc *eahd; |
166 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
167 | ||
168 | /* check checksum/crc */ | |
5e0f0017 MS |
169 | if (eahd->descTag.tagIdent != |
170 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 171 | le32_to_cpu(eahd->descTag.tagLocation) != |
48d6d8ff | 172 | iinfo->i_location.logicalBlockNum) |
1da177e4 | 173 | return NULL; |
cb00ea35 | 174 | |
1da177e4 LT |
175 | if (type < 2048) |
176 | offset = sizeof(struct extendedAttrHeaderDesc); | |
177 | else if (type < 65536) | |
178 | offset = le32_to_cpu(eahd->impAttrLocation); | |
179 | else | |
180 | offset = le32_to_cpu(eahd->appAttrLocation); | |
181 | ||
48d6d8ff | 182 | while (offset < iinfo->i_lenEAttr) { |
1da177e4 | 183 | gaf = (struct genericFormat *)&ea[offset]; |
4b11111a MS |
184 | if (le32_to_cpu(gaf->attrType) == type && |
185 | gaf->attrSubtype == subtype) | |
1da177e4 LT |
186 | return gaf; |
187 | else | |
188 | offset += le32_to_cpu(gaf->attrLength); | |
189 | } | |
190 | } | |
28de7948 | 191 | |
1da177e4 LT |
192 | return NULL; |
193 | } | |
194 | ||
195 | /* | |
196 | * udf_read_tagged | |
197 | * | |
198 | * PURPOSE | |
199 | * Read the first block of a tagged descriptor. | |
200 | * | |
201 | * HISTORY | |
202 | * July 1, 1997 - Andrew E. Mileski | |
203 | * Written, tested, and released. | |
204 | */ | |
cb00ea35 | 205 | struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, |
4b11111a | 206 | uint32_t location, uint16_t *ident) |
1da177e4 | 207 | { |
5ca4e4be | 208 | struct tag *tag_p; |
1da177e4 | 209 | struct buffer_head *bh = NULL; |
7e273e3b | 210 | u8 checksum; |
1da177e4 LT |
211 | |
212 | /* Read the block */ | |
213 | if (block == 0xFFFFFFFF) | |
214 | return NULL; | |
215 | ||
f4bcbbd9 | 216 | bh = udf_tread(sb, block); |
cb00ea35 | 217 | if (!bh) { |
8076c363 JP |
218 | udf_err(sb, "read failed, block=%u, location=%d\n", |
219 | block, location); | |
1da177e4 LT |
220 | return NULL; |
221 | } | |
222 | ||
5ca4e4be | 223 | tag_p = (struct tag *)(bh->b_data); |
1da177e4 LT |
224 | |
225 | *ident = le16_to_cpu(tag_p->tagIdent); | |
226 | ||
cb00ea35 | 227 | if (location != le32_to_cpu(tag_p->tagLocation)) { |
1da177e4 | 228 | udf_debug("location mismatch block %u, tag %u != %u\n", |
f4bcbbd9 | 229 | block, le32_to_cpu(tag_p->tagLocation), location); |
1da177e4 LT |
230 | goto error_out; |
231 | } | |
cb00ea35 | 232 | |
1da177e4 | 233 | /* Verify the tag checksum */ |
7e273e3b JP |
234 | checksum = udf_tag_checksum(tag_p); |
235 | if (checksum != tag_p->tagChecksum) { | |
8076c363 JP |
236 | udf_err(sb, "tag checksum failed, block %u: 0x%02x != 0x%02x\n", |
237 | block, checksum, tag_p->tagChecksum); | |
1da177e4 LT |
238 | goto error_out; |
239 | } | |
240 | ||
241 | /* Verify the tag version */ | |
5e0f0017 MS |
242 | if (tag_p->descVersion != cpu_to_le16(0x0002U) && |
243 | tag_p->descVersion != cpu_to_le16(0x0003U)) { | |
8076c363 JP |
244 | udf_err(sb, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n", |
245 | le16_to_cpu(tag_p->descVersion), block); | |
1da177e4 LT |
246 | goto error_out; |
247 | } | |
248 | ||
249 | /* Verify the descriptor CRC */ | |
5ca4e4be | 250 | if (le16_to_cpu(tag_p->descCRCLength) + sizeof(struct tag) > sb->s_blocksize || |
f845fced | 251 | le16_to_cpu(tag_p->descCRC) == crc_itu_t(0, |
5ca4e4be | 252 | bh->b_data + sizeof(struct tag), |
f845fced | 253 | le16_to_cpu(tag_p->descCRCLength))) |
1da177e4 | 254 | return bh; |
4b11111a | 255 | |
f4bcbbd9 | 256 | udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", block, |
8076c363 JP |
257 | le16_to_cpu(tag_p->descCRC), |
258 | le16_to_cpu(tag_p->descCRCLength)); | |
28de7948 | 259 | error_out: |
1da177e4 LT |
260 | brelse(bh); |
261 | return NULL; | |
262 | } | |
263 | ||
97e961fd PE |
264 | struct buffer_head *udf_read_ptagged(struct super_block *sb, |
265 | struct kernel_lb_addr *loc, | |
4b11111a | 266 | uint32_t offset, uint16_t *ident) |
1da177e4 LT |
267 | { |
268 | return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), | |
97e961fd | 269 | loc->logicalBlockNum + offset, ident); |
1da177e4 LT |
270 | } |
271 | ||
1da177e4 LT |
272 | void udf_update_tag(char *data, int length) |
273 | { | |
5ca4e4be PE |
274 | struct tag *tptr = (struct tag *)data; |
275 | length -= sizeof(struct tag); | |
1da177e4 | 276 | |
1da177e4 | 277 | tptr->descCRCLength = cpu_to_le16(length); |
5ca4e4be | 278 | tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(struct tag), length)); |
3f2587bb | 279 | tptr->tagChecksum = udf_tag_checksum(tptr); |
1da177e4 LT |
280 | } |
281 | ||
282 | void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, | |
cb00ea35 | 283 | uint32_t loc, int length) |
1da177e4 | 284 | { |
5ca4e4be | 285 | struct tag *tptr = (struct tag *)data; |
1da177e4 LT |
286 | tptr->tagIdent = cpu_to_le16(ident); |
287 | tptr->descVersion = cpu_to_le16(version); | |
288 | tptr->tagSerialNum = cpu_to_le16(snum); | |
289 | tptr->tagLocation = cpu_to_le32(loc); | |
290 | udf_update_tag(data, length); | |
291 | } | |
3f2587bb | 292 | |
5ca4e4be | 293 | u8 udf_tag_checksum(const struct tag *t) |
3f2587bb MS |
294 | { |
295 | u8 *data = (u8 *)t; | |
296 | u8 checksum = 0; | |
297 | int i; | |
5ca4e4be | 298 | for (i = 0; i < sizeof(struct tag); ++i) |
3f2587bb MS |
299 | if (i != 4) /* position of checksum */ |
300 | checksum += data[i]; | |
301 | return checksum; | |
302 | } |