blob: 1614d308d0f06039ee0a4b27e0e9e9f93c44e8da [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * misc.c
3 *
4 * PURPOSE
5 * Miscellaneous routines for the OSTA-UDF(tm) filesystem.
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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>
Bob Copelandf845fce2008-04-17 09:47:48 +020026#include <linux/crc-itu-t.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#include "udf_i.h"
29#include "udf_sb.h"
30
Steve Magnanib490bdd2017-10-12 08:48:40 -050031struct buffer_head *udf_tgetblk(struct super_block *sb, udf_pblk_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032{
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
Steve Magnanib490bdd2017-10-12 08:48:40 -050039struct buffer_head *udf_tread(struct super_block *sb, udf_pblk_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
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
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070047struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
48 uint32_t type, uint8_t loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 uint8_t *ea = NULL, *ad = NULL;
51 int offset;
52 uint16_t crclen;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080053 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Jan Kara382a2282020-09-25 12:29:54 +020055 ea = iinfo->i_data;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080056 if (iinfo->i_lenEAttr) {
Jan Kara382a2282020-09-25 12:29:54 +020057 ad = iinfo->i_data + iinfo->i_lenEAttr;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070058 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 ad = ea;
60 size += sizeof(struct extendedAttrHeaderDesc);
61 }
62
63 offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) -
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080064 iinfo->i_lenAlloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 /* TODO - Check for FreeEASpace */
67
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070068 if (loc & 0x01 && offset >= size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 struct extendedAttrHeaderDesc *eahd;
70 eahd = (struct extendedAttrHeaderDesc *)ea;
71
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080072 if (iinfo->i_lenAlloc)
73 memmove(&ad[size], ad, iinfo->i_lenAlloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080075 if (iinfo->i_lenEAttr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 /* check checksum/crc */
Marcin Slusarz5e0f0012008-02-08 04:20:41 -080077 if (eahd->descTag.tagIdent !=
78 cpu_to_le16(TAG_IDENT_EAHD) ||
Marcin Slusarz4b111112008-02-08 04:20:36 -080079 le32_to_cpu(eahd->descTag.tagLocation) !=
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080080 iinfo->i_location.logicalBlockNum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return NULL;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070082 } else {
Marcin Slusarz6c79e982008-02-08 04:20:30 -080083 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 size -= sizeof(struct extendedAttrHeaderDesc);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080086 iinfo->i_lenEAttr +=
Marcin Slusarz4b111112008-02-08 04:20:36 -080087 sizeof(struct extendedAttrHeaderDesc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD);
Marcin Slusarz6c79e982008-02-08 04:20:30 -080089 if (sbi->s_udfrev >= 0x0200)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 eahd->descTag.descVersion = cpu_to_le16(3);
91 else
92 eahd->descTag.descVersion = cpu_to_le16(2);
Marcin Slusarz4b111112008-02-08 04:20:36 -080093 eahd->descTag.tagSerialNum =
94 cpu_to_le16(sbi->s_serial_number);
95 eahd->descTag.tagLocation = cpu_to_le32(
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080096 iinfo->i_location.logicalBlockNum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF);
98 eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF);
99 }
100
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800101 offset = iinfo->i_lenEAttr;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700102 if (type < 2048) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800103 if (le32_to_cpu(eahd->appAttrLocation) <
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800104 iinfo->i_lenEAttr) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800105 uint32_t aal =
106 le32_to_cpu(eahd->appAttrLocation);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700107 memmove(&ea[offset - aal + size],
108 &ea[aal], offset - aal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 offset -= aal;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800110 eahd->appAttrLocation =
111 cpu_to_le32(aal + size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800113 if (le32_to_cpu(eahd->impAttrLocation) <
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800114 iinfo->i_lenEAttr) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800115 uint32_t ial =
116 le32_to_cpu(eahd->impAttrLocation);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700117 memmove(&ea[offset - ial + size],
118 &ea[ial], offset - ial);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 offset -= ial;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800120 eahd->impAttrLocation =
121 cpu_to_le32(ial + size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700123 } else if (type < 65536) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800124 if (le32_to_cpu(eahd->appAttrLocation) <
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800125 iinfo->i_lenEAttr) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800126 uint32_t aal =
127 le32_to_cpu(eahd->appAttrLocation);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700128 memmove(&ea[offset - aal + size],
129 &ea[aal], offset - aal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 offset -= aal;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800131 eahd->appAttrLocation =
132 cpu_to_le32(aal + size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134 }
135 /* rewrite CRC + checksum of eahd */
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200136 crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(struct tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 eahd->descTag.descCRCLength = cpu_to_le16(crclen);
Bob Copelandf845fce2008-04-17 09:47:48 +0200138 eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd +
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200139 sizeof(struct tag), crclen));
Marcin Slusarz3f2587b2008-02-08 04:20:39 -0800140 eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800141 iinfo->i_lenEAttr += size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return (struct genericFormat *)&ea[offset];
143 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return NULL;
146}
147
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700148struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type,
149 uint8_t subtype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct genericFormat *gaf;
152 uint8_t *ea = NULL;
153 uint32_t offset;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800154 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Jan Kara382a2282020-09-25 12:29:54 +0200156 ea = iinfo->i_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800158 if (iinfo->i_lenEAttr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 struct extendedAttrHeaderDesc *eahd;
160 eahd = (struct extendedAttrHeaderDesc *)ea;
161
162 /* check checksum/crc */
Marcin Slusarz5e0f0012008-02-08 04:20:41 -0800163 if (eahd->descTag.tagIdent !=
164 cpu_to_le16(TAG_IDENT_EAHD) ||
Marcin Slusarz4b111112008-02-08 04:20:36 -0800165 le32_to_cpu(eahd->descTag.tagLocation) !=
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800166 iinfo->i_location.logicalBlockNum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return NULL;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (type < 2048)
170 offset = sizeof(struct extendedAttrHeaderDesc);
171 else if (type < 65536)
172 offset = le32_to_cpu(eahd->impAttrLocation);
173 else
174 offset = le32_to_cpu(eahd->appAttrLocation);
175
Stian Skjelstad58bc6d12021-08-22 11:33:32 +0200176 while (offset + sizeof(*gaf) < iinfo->i_lenEAttr) {
177 uint32_t attrLength;
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 gaf = (struct genericFormat *)&ea[offset];
Stian Skjelstad58bc6d12021-08-22 11:33:32 +0200180 attrLength = le32_to_cpu(gaf->attrLength);
181
182 /* Detect undersized elements and buffer overflows */
183 if ((attrLength < sizeof(*gaf)) ||
184 (attrLength > (iinfo->i_lenEAttr - offset)))
185 break;
186
Marcin Slusarz4b111112008-02-08 04:20:36 -0800187 if (le32_to_cpu(gaf->attrType) == type &&
188 gaf->attrSubtype == subtype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return gaf;
190 else
Stian Skjelstad58bc6d12021-08-22 11:33:32 +0200191 offset += attrLength;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return NULL;
196}
197
198/*
199 * udf_read_tagged
200 *
201 * PURPOSE
202 * Read the first block of a tagged descriptor.
203 *
204 * HISTORY
205 * July 1, 1997 - Andrew E. Mileski
206 * Written, tested, and released.
207 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700208struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
Marcin Slusarz4b111112008-02-08 04:20:36 -0800209 uint32_t location, uint16_t *ident)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200211 struct tag *tag_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct buffer_head *bh = NULL;
Joe Perches7e273e32011-10-10 01:08:02 -0700213 u8 checksum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 /* Read the block */
216 if (block == 0xFFFFFFFF)
217 return NULL;
218
Sebastian Manciuleaf4bcbbd2008-04-08 14:02:11 +0200219 bh = udf_tread(sb, block);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700220 if (!bh) {
Steve Magnanifcbf7632017-10-12 08:48:41 -0500221 udf_err(sb, "read failed, block=%u, location=%u\n",
Joe Perches8076c362011-10-10 01:08:03 -0700222 block, location);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return NULL;
224 }
225
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200226 tag_p = (struct tag *)(bh->b_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 *ident = le16_to_cpu(tag_p->tagIdent);
229
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700230 if (location != le32_to_cpu(tag_p->tagLocation)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 udf_debug("location mismatch block %u, tag %u != %u\n",
Sebastian Manciuleaf4bcbbd2008-04-08 14:02:11 +0200232 block, le32_to_cpu(tag_p->tagLocation), location);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 goto error_out;
234 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 /* Verify the tag checksum */
Joe Perches7e273e32011-10-10 01:08:02 -0700237 checksum = udf_tag_checksum(tag_p);
238 if (checksum != tag_p->tagChecksum) {
Joe Perches8076c362011-10-10 01:08:03 -0700239 udf_err(sb, "tag checksum failed, block %u: 0x%02x != 0x%02x\n",
240 block, checksum, tag_p->tagChecksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 goto error_out;
242 }
243
244 /* Verify the tag version */
Marcin Slusarz5e0f0012008-02-08 04:20:41 -0800245 if (tag_p->descVersion != cpu_to_le16(0x0002U) &&
246 tag_p->descVersion != cpu_to_le16(0x0003U)) {
Joe Perches8076c362011-10-10 01:08:03 -0700247 udf_err(sb, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n",
248 le16_to_cpu(tag_p->descVersion), block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 goto error_out;
250 }
251
252 /* Verify the descriptor CRC */
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200253 if (le16_to_cpu(tag_p->descCRCLength) + sizeof(struct tag) > sb->s_blocksize ||
Bob Copelandf845fce2008-04-17 09:47:48 +0200254 le16_to_cpu(tag_p->descCRC) == crc_itu_t(0,
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200255 bh->b_data + sizeof(struct tag),
Bob Copelandf845fce2008-04-17 09:47:48 +0200256 le16_to_cpu(tag_p->descCRCLength)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return bh;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800258
Steve Magnanifcbf7632017-10-12 08:48:41 -0500259 udf_debug("Crc failure block %u: crc = %u, crclen = %u\n", block,
Joe Perches8076c362011-10-10 01:08:03 -0700260 le16_to_cpu(tag_p->descCRC),
261 le16_to_cpu(tag_p->descCRCLength));
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700262error_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 brelse(bh);
264 return NULL;
265}
266
Pekka Enberg97e961f2008-10-15 12:29:03 +0200267struct buffer_head *udf_read_ptagged(struct super_block *sb,
268 struct kernel_lb_addr *loc,
Marcin Slusarz4b111112008-02-08 04:20:36 -0800269 uint32_t offset, uint16_t *ident)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
271 return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset),
Pekka Enberg97e961f2008-10-15 12:29:03 +0200272 loc->logicalBlockNum + offset, ident);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275void udf_update_tag(char *data, int length)
276{
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200277 struct tag *tptr = (struct tag *)data;
278 length -= sizeof(struct tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 tptr->descCRCLength = cpu_to_le16(length);
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200281 tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(struct tag), length));
Marcin Slusarz3f2587b2008-02-08 04:20:39 -0800282 tptr->tagChecksum = udf_tag_checksum(tptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700286 uint32_t loc, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200288 struct tag *tptr = (struct tag *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 tptr->tagIdent = cpu_to_le16(ident);
290 tptr->descVersion = cpu_to_le16(version);
291 tptr->tagSerialNum = cpu_to_le16(snum);
292 tptr->tagLocation = cpu_to_le32(loc);
293 udf_update_tag(data, length);
294}
Marcin Slusarz3f2587b2008-02-08 04:20:39 -0800295
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200296u8 udf_tag_checksum(const struct tag *t)
Marcin Slusarz3f2587b2008-02-08 04:20:39 -0800297{
298 u8 *data = (u8 *)t;
299 u8 checksum = 0;
300 int i;
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200301 for (i = 0; i < sizeof(struct tag); ++i)
Marcin Slusarz3f2587b2008-02-08 04:20:39 -0800302 if (i != 4) /* position of checksum */
303 checksum += data[i];
304 return checksum;
305}