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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> | |
26 | #include <linux/udf_fs.h> | |
27 | #include <linux/buffer_head.h> | |
28 | ||
29 | #include "udf_i.h" | |
30 | #include "udf_sb.h" | |
31 | ||
cb00ea35 | 32 | struct buffer_head *udf_tgetblk(struct super_block *sb, int block) |
1da177e4 LT |
33 | { |
34 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) | |
35 | return sb_getblk(sb, udf_fixed_to_variable(block)); | |
36 | else | |
37 | return sb_getblk(sb, block); | |
38 | } | |
39 | ||
cb00ea35 | 40 | struct buffer_head *udf_tread(struct super_block *sb, int block) |
1da177e4 LT |
41 | { |
42 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) | |
43 | return sb_bread(sb, udf_fixed_to_variable(block)); | |
44 | else | |
45 | return sb_bread(sb, block); | |
46 | } | |
47 | ||
cb00ea35 CG |
48 | struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size, |
49 | uint32_t type, uint8_t loc) | |
1da177e4 LT |
50 | { |
51 | uint8_t *ea = NULL, *ad = NULL; | |
52 | int offset; | |
53 | uint16_t crclen; | |
48d6d8ff | 54 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 55 | |
48d6d8ff MS |
56 | ea = iinfo->i_ext.i_data; |
57 | if (iinfo->i_lenEAttr) { | |
58 | ad = iinfo->i_ext.i_data + iinfo->i_lenEAttr; | |
28de7948 | 59 | } else { |
1da177e4 LT |
60 | ad = ea; |
61 | size += sizeof(struct extendedAttrHeaderDesc); | |
62 | } | |
63 | ||
64 | offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - | |
48d6d8ff | 65 | iinfo->i_lenAlloc; |
1da177e4 LT |
66 | |
67 | /* TODO - Check for FreeEASpace */ | |
68 | ||
cb00ea35 | 69 | if (loc & 0x01 && offset >= size) { |
1da177e4 LT |
70 | struct extendedAttrHeaderDesc *eahd; |
71 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
72 | ||
48d6d8ff MS |
73 | if (iinfo->i_lenAlloc) |
74 | memmove(&ad[size], ad, iinfo->i_lenAlloc); | |
1da177e4 | 75 | |
48d6d8ff | 76 | if (iinfo->i_lenEAttr) { |
1da177e4 | 77 | /* check checksum/crc */ |
5e0f0017 MS |
78 | if (eahd->descTag.tagIdent != |
79 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 80 | le32_to_cpu(eahd->descTag.tagLocation) != |
48d6d8ff | 81 | iinfo->i_location.logicalBlockNum) |
1da177e4 | 82 | return NULL; |
cb00ea35 | 83 | } else { |
6c79e987 MS |
84 | struct udf_sb_info *sbi = UDF_SB(inode->i_sb); |
85 | ||
1da177e4 | 86 | size -= sizeof(struct extendedAttrHeaderDesc); |
48d6d8ff | 87 | iinfo->i_lenEAttr += |
4b11111a | 88 | sizeof(struct extendedAttrHeaderDesc); |
1da177e4 | 89 | eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); |
6c79e987 | 90 | if (sbi->s_udfrev >= 0x0200) |
1da177e4 LT |
91 | eahd->descTag.descVersion = cpu_to_le16(3); |
92 | else | |
93 | eahd->descTag.descVersion = cpu_to_le16(2); | |
4b11111a MS |
94 | eahd->descTag.tagSerialNum = |
95 | cpu_to_le16(sbi->s_serial_number); | |
96 | eahd->descTag.tagLocation = cpu_to_le32( | |
48d6d8ff | 97 | iinfo->i_location.logicalBlockNum); |
1da177e4 LT |
98 | eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); |
99 | eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); | |
100 | } | |
101 | ||
48d6d8ff | 102 | offset = iinfo->i_lenEAttr; |
cb00ea35 | 103 | if (type < 2048) { |
4b11111a | 104 | if (le32_to_cpu(eahd->appAttrLocation) < |
48d6d8ff | 105 | iinfo->i_lenEAttr) { |
4b11111a MS |
106 | uint32_t aal = |
107 | le32_to_cpu(eahd->appAttrLocation); | |
28de7948 CG |
108 | memmove(&ea[offset - aal + size], |
109 | &ea[aal], offset - aal); | |
1da177e4 | 110 | offset -= aal; |
4b11111a MS |
111 | eahd->appAttrLocation = |
112 | cpu_to_le32(aal + size); | |
1da177e4 | 113 | } |
4b11111a | 114 | if (le32_to_cpu(eahd->impAttrLocation) < |
48d6d8ff | 115 | iinfo->i_lenEAttr) { |
4b11111a MS |
116 | uint32_t ial = |
117 | le32_to_cpu(eahd->impAttrLocation); | |
28de7948 CG |
118 | memmove(&ea[offset - ial + size], |
119 | &ea[ial], offset - ial); | |
1da177e4 | 120 | offset -= ial; |
4b11111a MS |
121 | eahd->impAttrLocation = |
122 | cpu_to_le32(ial + size); | |
1da177e4 | 123 | } |
cb00ea35 | 124 | } else if (type < 65536) { |
4b11111a | 125 | if (le32_to_cpu(eahd->appAttrLocation) < |
48d6d8ff | 126 | iinfo->i_lenEAttr) { |
4b11111a MS |
127 | uint32_t aal = |
128 | le32_to_cpu(eahd->appAttrLocation); | |
28de7948 CG |
129 | memmove(&ea[offset - aal + size], |
130 | &ea[aal], offset - aal); | |
1da177e4 | 131 | offset -= aal; |
4b11111a MS |
132 | eahd->appAttrLocation = |
133 | cpu_to_le32(aal + size); | |
1da177e4 LT |
134 | } |
135 | } | |
136 | /* rewrite CRC + checksum of eahd */ | |
137 | crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag); | |
138 | eahd->descTag.descCRCLength = cpu_to_le16(crclen); | |
28de7948 | 139 | eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd + |
4b11111a | 140 | sizeof(tag), crclen, 0)); |
3f2587bb | 141 | eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); |
48d6d8ff | 142 | iinfo->i_lenEAttr += size; |
1da177e4 LT |
143 | return (struct genericFormat *)&ea[offset]; |
144 | } | |
4b11111a MS |
145 | if (loc & 0x02) |
146 | ; | |
28de7948 | 147 | |
1da177e4 LT |
148 | return NULL; |
149 | } | |
150 | ||
cb00ea35 CG |
151 | struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, |
152 | uint8_t subtype) | |
1da177e4 LT |
153 | { |
154 | struct genericFormat *gaf; | |
155 | uint8_t *ea = NULL; | |
156 | uint32_t offset; | |
48d6d8ff | 157 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 158 | |
48d6d8ff | 159 | ea = iinfo->i_ext.i_data; |
1da177e4 | 160 | |
48d6d8ff | 161 | if (iinfo->i_lenEAttr) { |
1da177e4 LT |
162 | struct extendedAttrHeaderDesc *eahd; |
163 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
164 | ||
165 | /* check checksum/crc */ | |
5e0f0017 MS |
166 | if (eahd->descTag.tagIdent != |
167 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 168 | le32_to_cpu(eahd->descTag.tagLocation) != |
48d6d8ff | 169 | iinfo->i_location.logicalBlockNum) |
1da177e4 | 170 | return NULL; |
cb00ea35 | 171 | |
1da177e4 LT |
172 | if (type < 2048) |
173 | offset = sizeof(struct extendedAttrHeaderDesc); | |
174 | else if (type < 65536) | |
175 | offset = le32_to_cpu(eahd->impAttrLocation); | |
176 | else | |
177 | offset = le32_to_cpu(eahd->appAttrLocation); | |
178 | ||
48d6d8ff | 179 | while (offset < iinfo->i_lenEAttr) { |
1da177e4 | 180 | gaf = (struct genericFormat *)&ea[offset]; |
4b11111a MS |
181 | if (le32_to_cpu(gaf->attrType) == type && |
182 | gaf->attrSubtype == subtype) | |
1da177e4 LT |
183 | return gaf; |
184 | else | |
185 | offset += le32_to_cpu(gaf->attrLength); | |
186 | } | |
187 | } | |
28de7948 | 188 | |
1da177e4 LT |
189 | return NULL; |
190 | } | |
191 | ||
192 | /* | |
193 | * udf_read_tagged | |
194 | * | |
195 | * PURPOSE | |
196 | * Read the first block of a tagged descriptor. | |
197 | * | |
198 | * HISTORY | |
199 | * July 1, 1997 - Andrew E. Mileski | |
200 | * Written, tested, and released. | |
201 | */ | |
cb00ea35 | 202 | struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, |
4b11111a | 203 | uint32_t location, uint16_t *ident) |
1da177e4 LT |
204 | { |
205 | tag *tag_p; | |
206 | struct buffer_head *bh = NULL; | |
6c79e987 | 207 | struct udf_sb_info *sbi = UDF_SB(sb); |
1da177e4 LT |
208 | |
209 | /* Read the block */ | |
210 | if (block == 0xFFFFFFFF) | |
211 | return NULL; | |
212 | ||
6c79e987 | 213 | bh = udf_tread(sb, block + sbi->s_session); |
cb00ea35 CG |
214 | if (!bh) { |
215 | udf_debug("block=%d, location=%d: read failed\n", | |
6c79e987 | 216 | block + sbi->s_session, location); |
1da177e4 LT |
217 | return NULL; |
218 | } | |
219 | ||
28de7948 | 220 | tag_p = (tag *)(bh->b_data); |
1da177e4 LT |
221 | |
222 | *ident = le16_to_cpu(tag_p->tagIdent); | |
223 | ||
cb00ea35 | 224 | if (location != le32_to_cpu(tag_p->tagLocation)) { |
1da177e4 | 225 | udf_debug("location mismatch block %u, tag %u != %u\n", |
4b11111a MS |
226 | block + sbi->s_session, |
227 | le32_to_cpu(tag_p->tagLocation), location); | |
1da177e4 LT |
228 | goto error_out; |
229 | } | |
cb00ea35 | 230 | |
1da177e4 | 231 | /* Verify the tag checksum */ |
3f2587bb | 232 | if (udf_tag_checksum(tag_p) != tag_p->tagChecksum) { |
1da177e4 LT |
233 | printk(KERN_ERR "udf: tag checksum failed block %d\n", block); |
234 | goto error_out; | |
235 | } | |
236 | ||
237 | /* Verify the tag version */ | |
5e0f0017 MS |
238 | if (tag_p->descVersion != cpu_to_le16(0x0002U) && |
239 | tag_p->descVersion != cpu_to_le16(0x0003U)) { | |
1da177e4 | 240 | udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n", |
cb00ea35 | 241 | le16_to_cpu(tag_p->descVersion), block); |
1da177e4 LT |
242 | goto error_out; |
243 | } | |
244 | ||
245 | /* Verify the descriptor CRC */ | |
246 | if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize || | |
cb00ea35 | 247 | le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag), |
4b11111a | 248 | le16_to_cpu(tag_p->descCRCLength), 0)) |
1da177e4 | 249 | return bh; |
4b11111a | 250 | |
1da177e4 | 251 | udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", |
6c79e987 | 252 | block + sbi->s_session, le16_to_cpu(tag_p->descCRC), |
cb00ea35 | 253 | le16_to_cpu(tag_p->descCRCLength)); |
1da177e4 | 254 | |
28de7948 | 255 | error_out: |
1da177e4 LT |
256 | brelse(bh); |
257 | return NULL; | |
258 | } | |
259 | ||
cb00ea35 | 260 | struct buffer_head *udf_read_ptagged(struct super_block *sb, kernel_lb_addr loc, |
4b11111a | 261 | uint32_t offset, uint16_t *ident) |
1da177e4 LT |
262 | { |
263 | return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), | |
cb00ea35 | 264 | loc.logicalBlockNum + offset, ident); |
1da177e4 LT |
265 | } |
266 | ||
1da177e4 LT |
267 | void udf_update_tag(char *data, int length) |
268 | { | |
28de7948 | 269 | tag *tptr = (tag *)data; |
1da177e4 LT |
270 | length -= sizeof(tag); |
271 | ||
1da177e4 LT |
272 | tptr->descCRCLength = cpu_to_le16(length); |
273 | tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0)); | |
3f2587bb | 274 | tptr->tagChecksum = udf_tag_checksum(tptr); |
1da177e4 LT |
275 | } |
276 | ||
277 | void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, | |
cb00ea35 | 278 | uint32_t loc, int length) |
1da177e4 | 279 | { |
28de7948 | 280 | tag *tptr = (tag *)data; |
1da177e4 LT |
281 | tptr->tagIdent = cpu_to_le16(ident); |
282 | tptr->descVersion = cpu_to_le16(version); | |
283 | tptr->tagSerialNum = cpu_to_le16(snum); | |
284 | tptr->tagLocation = cpu_to_le32(loc); | |
285 | udf_update_tag(data, length); | |
286 | } | |
3f2587bb MS |
287 | |
288 | u8 udf_tag_checksum(const tag *t) | |
289 | { | |
290 | u8 *data = (u8 *)t; | |
291 | u8 checksum = 0; | |
292 | int i; | |
293 | for (i = 0; i < sizeof(tag); ++i) | |
294 | if (i != 4) /* position of checksum */ | |
295 | checksum += data[i]; | |
296 | return checksum; | |
297 | } |