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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; | |
1da177e4 | 54 | |
c0b34438 MS |
55 | ea = UDF_I(inode)->i_ext.i_data; |
56 | if (UDF_I(inode)->i_lenEAttr) { | |
57 | ad = UDF_I(inode)->i_ext.i_data + UDF_I(inode)->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) - | |
c0b34438 | 64 | UDF_I(inode)->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 | ||
c0b34438 MS |
72 | if (UDF_I(inode)->i_lenAlloc) |
73 | memmove(&ad[size], ad, UDF_I(inode)->i_lenAlloc); | |
1da177e4 | 74 | |
c0b34438 | 75 | if (UDF_I(inode)->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) != |
c0b34438 | 80 | UDF_I(inode)->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); |
c0b34438 | 86 | UDF_I(inode)->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( | |
c0b34438 | 96 | UDF_I(inode)->i_location.logicalBlockNum); |
1da177e4 LT |
97 | eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); |
98 | eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); | |
99 | } | |
100 | ||
c0b34438 | 101 | offset = UDF_I(inode)->i_lenEAttr; |
cb00ea35 | 102 | if (type < 2048) { |
4b11111a | 103 | if (le32_to_cpu(eahd->appAttrLocation) < |
c0b34438 | 104 | UDF_I(inode)->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) < |
c0b34438 | 114 | UDF_I(inode)->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) < |
c0b34438 | 125 | UDF_I(inode)->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); |
c0b34438 | 141 | UDF_I(inode)->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; | |
156 | ||
c0b34438 | 157 | ea = UDF_I(inode)->i_ext.i_data; |
1da177e4 | 158 | |
c0b34438 | 159 | if (UDF_I(inode)->i_lenEAttr) { |
1da177e4 LT |
160 | struct extendedAttrHeaderDesc *eahd; |
161 | eahd = (struct extendedAttrHeaderDesc *)ea; | |
162 | ||
163 | /* check checksum/crc */ | |
5e0f0017 MS |
164 | if (eahd->descTag.tagIdent != |
165 | cpu_to_le16(TAG_IDENT_EAHD) || | |
4b11111a | 166 | le32_to_cpu(eahd->descTag.tagLocation) != |
c0b34438 | 167 | UDF_I(inode)->i_location.logicalBlockNum) |
1da177e4 | 168 | return NULL; |
cb00ea35 | 169 | |
1da177e4 LT |
170 | if (type < 2048) |
171 | offset = sizeof(struct extendedAttrHeaderDesc); | |
172 | else if (type < 65536) | |
173 | offset = le32_to_cpu(eahd->impAttrLocation); | |
174 | else | |
175 | offset = le32_to_cpu(eahd->appAttrLocation); | |
176 | ||
c0b34438 | 177 | while (offset < UDF_I(inode)->i_lenEAttr) { |
1da177e4 | 178 | gaf = (struct genericFormat *)&ea[offset]; |
4b11111a MS |
179 | if (le32_to_cpu(gaf->attrType) == type && |
180 | gaf->attrSubtype == subtype) | |
1da177e4 LT |
181 | return gaf; |
182 | else | |
183 | offset += le32_to_cpu(gaf->attrLength); | |
184 | } | |
185 | } | |
28de7948 | 186 | |
1da177e4 LT |
187 | return NULL; |
188 | } | |
189 | ||
190 | /* | |
191 | * udf_read_tagged | |
192 | * | |
193 | * PURPOSE | |
194 | * Read the first block of a tagged descriptor. | |
195 | * | |
196 | * HISTORY | |
197 | * July 1, 1997 - Andrew E. Mileski | |
198 | * Written, tested, and released. | |
199 | */ | |
cb00ea35 | 200 | struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, |
4b11111a | 201 | uint32_t location, uint16_t *ident) |
1da177e4 LT |
202 | { |
203 | tag *tag_p; | |
204 | struct buffer_head *bh = NULL; | |
6c79e987 | 205 | struct udf_sb_info *sbi = UDF_SB(sb); |
1da177e4 LT |
206 | |
207 | /* Read the block */ | |
208 | if (block == 0xFFFFFFFF) | |
209 | return NULL; | |
210 | ||
6c79e987 | 211 | bh = udf_tread(sb, block + sbi->s_session); |
cb00ea35 CG |
212 | if (!bh) { |
213 | udf_debug("block=%d, location=%d: read failed\n", | |
6c79e987 | 214 | block + sbi->s_session, location); |
1da177e4 LT |
215 | return NULL; |
216 | } | |
217 | ||
28de7948 | 218 | tag_p = (tag *)(bh->b_data); |
1da177e4 LT |
219 | |
220 | *ident = le16_to_cpu(tag_p->tagIdent); | |
221 | ||
cb00ea35 | 222 | if (location != le32_to_cpu(tag_p->tagLocation)) { |
1da177e4 | 223 | udf_debug("location mismatch block %u, tag %u != %u\n", |
4b11111a MS |
224 | block + sbi->s_session, |
225 | le32_to_cpu(tag_p->tagLocation), location); | |
1da177e4 LT |
226 | goto error_out; |
227 | } | |
cb00ea35 | 228 | |
1da177e4 | 229 | /* Verify the tag checksum */ |
3f2587bb | 230 | if (udf_tag_checksum(tag_p) != tag_p->tagChecksum) { |
1da177e4 LT |
231 | printk(KERN_ERR "udf: tag checksum failed block %d\n", block); |
232 | goto error_out; | |
233 | } | |
234 | ||
235 | /* Verify the tag version */ | |
5e0f0017 MS |
236 | if (tag_p->descVersion != cpu_to_le16(0x0002U) && |
237 | tag_p->descVersion != cpu_to_le16(0x0003U)) { | |
1da177e4 | 238 | udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n", |
cb00ea35 | 239 | le16_to_cpu(tag_p->descVersion), block); |
1da177e4 LT |
240 | goto error_out; |
241 | } | |
242 | ||
243 | /* Verify the descriptor CRC */ | |
244 | if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize || | |
cb00ea35 | 245 | le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag), |
4b11111a | 246 | le16_to_cpu(tag_p->descCRCLength), 0)) |
1da177e4 | 247 | return bh; |
4b11111a | 248 | |
1da177e4 | 249 | udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", |
6c79e987 | 250 | block + sbi->s_session, le16_to_cpu(tag_p->descCRC), |
cb00ea35 | 251 | le16_to_cpu(tag_p->descCRCLength)); |
1da177e4 | 252 | |
28de7948 | 253 | error_out: |
1da177e4 LT |
254 | brelse(bh); |
255 | return NULL; | |
256 | } | |
257 | ||
cb00ea35 | 258 | struct buffer_head *udf_read_ptagged(struct super_block *sb, kernel_lb_addr loc, |
4b11111a | 259 | uint32_t offset, uint16_t *ident) |
1da177e4 LT |
260 | { |
261 | return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), | |
cb00ea35 | 262 | loc.logicalBlockNum + offset, ident); |
1da177e4 LT |
263 | } |
264 | ||
1da177e4 LT |
265 | void udf_update_tag(char *data, int length) |
266 | { | |
28de7948 | 267 | tag *tptr = (tag *)data; |
1da177e4 LT |
268 | length -= sizeof(tag); |
269 | ||
1da177e4 LT |
270 | tptr->descCRCLength = cpu_to_le16(length); |
271 | tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0)); | |
3f2587bb | 272 | tptr->tagChecksum = udf_tag_checksum(tptr); |
1da177e4 LT |
273 | } |
274 | ||
275 | void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, | |
cb00ea35 | 276 | uint32_t loc, int length) |
1da177e4 | 277 | { |
28de7948 | 278 | tag *tptr = (tag *)data; |
1da177e4 LT |
279 | tptr->tagIdent = cpu_to_le16(ident); |
280 | tptr->descVersion = cpu_to_le16(version); | |
281 | tptr->tagSerialNum = cpu_to_le16(snum); | |
282 | tptr->tagLocation = cpu_to_le32(loc); | |
283 | udf_update_tag(data, length); | |
284 | } | |
3f2587bb MS |
285 | |
286 | u8 udf_tag_checksum(const tag *t) | |
287 | { | |
288 | u8 *data = (u8 *)t; | |
289 | u8 checksum = 0; | |
290 | int i; | |
291 | for (i = 0; i < sizeof(tag); ++i) | |
292 | if (i != 4) /* position of checksum */ | |
293 | checksum += data[i]; | |
294 | return checksum; | |
295 | } |