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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> | |
1da177e4 LT |
26 | #include <linux/buffer_head.h> |
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); | |
28de7948 CG |
107 | memmove(&ea[offset - aal + size], |
108 | &ea[aal], offset - aal); | |
1da177e4 | 109 | offset -= aal; |
4b11111a MS |
110 | eahd->appAttrLocation = |
111 | cpu_to_le32(aal + size); | |
1da177e4 | 112 | } |
4b11111a | 113 | if (le32_to_cpu(eahd->impAttrLocation) < |
48d6d8ff | 114 | iinfo->i_lenEAttr) { |
4b11111a MS |
115 | uint32_t ial = |
116 | le32_to_cpu(eahd->impAttrLocation); | |
28de7948 CG |
117 | memmove(&ea[offset - ial + size], |
118 | &ea[ial], offset - ial); | |
1da177e4 | 119 | offset -= ial; |
4b11111a MS |
120 | eahd->impAttrLocation = |
121 | cpu_to_le32(ial + size); | |
1da177e4 | 122 | } |
cb00ea35 | 123 | } else if (type < 65536) { |
4b11111a | 124 | if (le32_to_cpu(eahd->appAttrLocation) < |
48d6d8ff | 125 | iinfo->i_lenEAttr) { |
4b11111a MS |
126 | uint32_t aal = |
127 | le32_to_cpu(eahd->appAttrLocation); | |
28de7948 CG |
128 | memmove(&ea[offset - aal + size], |
129 | &ea[aal], offset - aal); | |
1da177e4 | 130 | offset -= aal; |
4b11111a MS |
131 | eahd->appAttrLocation = |
132 | cpu_to_le32(aal + size); | |
1da177e4 LT |
133 | } |
134 | } | |
135 | /* rewrite CRC + checksum of eahd */ | |
136 | crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag); | |
137 | eahd->descTag.descCRCLength = cpu_to_le16(crclen); | |
28de7948 | 138 | eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd + |
4b11111a | 139 | sizeof(tag), crclen, 0)); |
3f2587bb | 140 | eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); |
48d6d8ff | 141 | iinfo->i_lenEAttr += size; |
1da177e4 LT |
142 | return (struct genericFormat *)&ea[offset]; |
143 | } | |
4b11111a MS |
144 | if (loc & 0x02) |
145 | ; | |
28de7948 | 146 | |
1da177e4 LT |
147 | return NULL; |
148 | } | |
149 | ||
cb00ea35 CG |
150 | struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, |
151 | uint8_t subtype) | |
1da177e4 LT |
152 | { |
153 | struct genericFormat *gaf; | |
154 | uint8_t *ea = NULL; | |
155 | uint32_t offset; | |
48d6d8ff | 156 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 157 | |
48d6d8ff | 158 | ea = iinfo->i_ext.i_data; |
1da177e4 | 159 | |
48d6d8ff | 160 | if (iinfo->i_lenEAttr) { |
1da177e4 LT |
161 | struct extendedAttrHeaderDesc *eahd; |
162 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
163 | ||
164 | /* check checksum/crc */ | |
5e0f0017 MS |
165 | if (eahd->descTag.tagIdent != |
166 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 167 | le32_to_cpu(eahd->descTag.tagLocation) != |
48d6d8ff | 168 | iinfo->i_location.logicalBlockNum) |
1da177e4 | 169 | return NULL; |
cb00ea35 | 170 | |
1da177e4 LT |
171 | if (type < 2048) |
172 | offset = sizeof(struct extendedAttrHeaderDesc); | |
173 | else if (type < 65536) | |
174 | offset = le32_to_cpu(eahd->impAttrLocation); | |
175 | else | |
176 | offset = le32_to_cpu(eahd->appAttrLocation); | |
177 | ||
48d6d8ff | 178 | while (offset < iinfo->i_lenEAttr) { |
1da177e4 | 179 | gaf = (struct genericFormat *)&ea[offset]; |
4b11111a MS |
180 | if (le32_to_cpu(gaf->attrType) == type && |
181 | gaf->attrSubtype == subtype) | |
1da177e4 LT |
182 | return gaf; |
183 | else | |
184 | offset += le32_to_cpu(gaf->attrLength); | |
185 | } | |
186 | } | |
28de7948 | 187 | |
1da177e4 LT |
188 | return NULL; |
189 | } | |
190 | ||
191 | /* | |
192 | * udf_read_tagged | |
193 | * | |
194 | * PURPOSE | |
195 | * Read the first block of a tagged descriptor. | |
196 | * | |
197 | * HISTORY | |
198 | * July 1, 1997 - Andrew E. Mileski | |
199 | * Written, tested, and released. | |
200 | */ | |
cb00ea35 | 201 | struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, |
4b11111a | 202 | uint32_t location, uint16_t *ident) |
1da177e4 LT |
203 | { |
204 | tag *tag_p; | |
205 | struct buffer_head *bh = NULL; | |
6c79e987 | 206 | struct udf_sb_info *sbi = UDF_SB(sb); |
1da177e4 LT |
207 | |
208 | /* Read the block */ | |
209 | if (block == 0xFFFFFFFF) | |
210 | return NULL; | |
211 | ||
6c79e987 | 212 | bh = udf_tread(sb, block + sbi->s_session); |
cb00ea35 CG |
213 | if (!bh) { |
214 | udf_debug("block=%d, location=%d: read failed\n", | |
6c79e987 | 215 | block + sbi->s_session, location); |
1da177e4 LT |
216 | return NULL; |
217 | } | |
218 | ||
28de7948 | 219 | tag_p = (tag *)(bh->b_data); |
1da177e4 LT |
220 | |
221 | *ident = le16_to_cpu(tag_p->tagIdent); | |
222 | ||
cb00ea35 | 223 | if (location != le32_to_cpu(tag_p->tagLocation)) { |
1da177e4 | 224 | udf_debug("location mismatch block %u, tag %u != %u\n", |
4b11111a MS |
225 | block + sbi->s_session, |
226 | le32_to_cpu(tag_p->tagLocation), location); | |
1da177e4 LT |
227 | goto error_out; |
228 | } | |
cb00ea35 | 229 | |
1da177e4 | 230 | /* Verify the tag checksum */ |
3f2587bb | 231 | if (udf_tag_checksum(tag_p) != tag_p->tagChecksum) { |
1da177e4 LT |
232 | printk(KERN_ERR "udf: tag checksum failed block %d\n", block); |
233 | goto error_out; | |
234 | } | |
235 | ||
236 | /* Verify the tag version */ | |
5e0f0017 MS |
237 | if (tag_p->descVersion != cpu_to_le16(0x0002U) && |
238 | tag_p->descVersion != cpu_to_le16(0x0003U)) { | |
1da177e4 | 239 | udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n", |
cb00ea35 | 240 | le16_to_cpu(tag_p->descVersion), block); |
1da177e4 LT |
241 | goto error_out; |
242 | } | |
243 | ||
244 | /* Verify the descriptor CRC */ | |
245 | if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize || | |
cb00ea35 | 246 | le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag), |
4b11111a | 247 | le16_to_cpu(tag_p->descCRCLength), 0)) |
1da177e4 | 248 | return bh; |
4b11111a | 249 | |
1da177e4 | 250 | udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", |
6c79e987 | 251 | block + sbi->s_session, le16_to_cpu(tag_p->descCRC), |
cb00ea35 | 252 | le16_to_cpu(tag_p->descCRCLength)); |
1da177e4 | 253 | |
28de7948 | 254 | error_out: |
1da177e4 LT |
255 | brelse(bh); |
256 | return NULL; | |
257 | } | |
258 | ||
cb00ea35 | 259 | struct buffer_head *udf_read_ptagged(struct super_block *sb, kernel_lb_addr loc, |
4b11111a | 260 | uint32_t offset, uint16_t *ident) |
1da177e4 LT |
261 | { |
262 | return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), | |
cb00ea35 | 263 | loc.logicalBlockNum + offset, ident); |
1da177e4 LT |
264 | } |
265 | ||
1da177e4 LT |
266 | void udf_update_tag(char *data, int length) |
267 | { | |
28de7948 | 268 | tag *tptr = (tag *)data; |
1da177e4 LT |
269 | length -= sizeof(tag); |
270 | ||
1da177e4 LT |
271 | tptr->descCRCLength = cpu_to_le16(length); |
272 | tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0)); | |
3f2587bb | 273 | tptr->tagChecksum = udf_tag_checksum(tptr); |
1da177e4 LT |
274 | } |
275 | ||
276 | void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, | |
cb00ea35 | 277 | uint32_t loc, int length) |
1da177e4 | 278 | { |
28de7948 | 279 | tag *tptr = (tag *)data; |
1da177e4 LT |
280 | tptr->tagIdent = cpu_to_le16(ident); |
281 | tptr->descVersion = cpu_to_le16(version); | |
282 | tptr->tagSerialNum = cpu_to_le16(snum); | |
283 | tptr->tagLocation = cpu_to_le32(loc); | |
284 | udf_update_tag(data, length); | |
285 | } | |
3f2587bb MS |
286 | |
287 | u8 udf_tag_checksum(const tag *t) | |
288 | { | |
289 | u8 *data = (u8 *)t; | |
290 | u8 checksum = 0; | |
291 | int i; | |
292 | for (i = 0; i < sizeof(tag); ++i) | |
293 | if (i != 4) /* position of checksum */ | |
294 | checksum += data[i]; | |
295 | return checksum; | |
296 | } |