11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * misc.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * PURPOSE 51da177e4SLinus Torvalds * Miscellaneous routines for the OSTA-UDF(tm) filesystem. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * COPYRIGHT 81da177e4SLinus Torvalds * This file is distributed under the terms of the GNU General Public 91da177e4SLinus Torvalds * License (GPL). Copies of the GPL can be obtained from: 101da177e4SLinus Torvalds * ftp://prep.ai.mit.edu/pub/gnu/GPL 111da177e4SLinus Torvalds * Each contributing author retains all rights to their own work. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * (C) 1998 Dave Boynton 141da177e4SLinus Torvalds * (C) 1998-2004 Ben Fennema 151da177e4SLinus Torvalds * (C) 1999-2000 Stelias Computing Inc 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * HISTORY 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * 04/19/99 blf partial support for reading/writing specific EA's 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include "udfdecl.h" 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <linux/fs.h> 251da177e4SLinus Torvalds #include <linux/string.h> 26f845fcedSBob Copeland #include <linux/crc-itu-t.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include "udf_i.h" 291da177e4SLinus Torvalds #include "udf_sb.h" 301da177e4SLinus Torvalds 31cb00ea35SCyrill Gorcunov struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size, 32cb00ea35SCyrill Gorcunov uint32_t type, uint8_t loc) 331da177e4SLinus Torvalds { 341da177e4SLinus Torvalds uint8_t *ea = NULL, *ad = NULL; 351da177e4SLinus Torvalds int offset; 361da177e4SLinus Torvalds uint16_t crclen; 3748d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 381da177e4SLinus Torvalds 39382a2287SJan Kara ea = iinfo->i_data; 4048d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 41382a2287SJan Kara ad = iinfo->i_data + iinfo->i_lenEAttr; 4228de7948SCyrill Gorcunov } else { 431da177e4SLinus Torvalds ad = ea; 441da177e4SLinus Torvalds size += sizeof(struct extendedAttrHeaderDesc); 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - 4848d6d8ffSMarcin Slusarz iinfo->i_lenAlloc; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds /* TODO - Check for FreeEASpace */ 511da177e4SLinus Torvalds 52cb00ea35SCyrill Gorcunov if (loc & 0x01 && offset >= size) { 531da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 541da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 551da177e4SLinus Torvalds 5648d6d8ffSMarcin Slusarz if (iinfo->i_lenAlloc) 5748d6d8ffSMarcin Slusarz memmove(&ad[size], ad, iinfo->i_lenAlloc); 581da177e4SLinus Torvalds 5948d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 601da177e4SLinus Torvalds /* check checksum/crc */ 615e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 625e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 634b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 6448d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum) 651da177e4SLinus Torvalds return NULL; 66cb00ea35SCyrill Gorcunov } else { 676c79e987SMarcin Slusarz struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 686c79e987SMarcin Slusarz 691da177e4SLinus Torvalds size -= sizeof(struct extendedAttrHeaderDesc); 7048d6d8ffSMarcin Slusarz iinfo->i_lenEAttr += 714b11111aSMarcin Slusarz sizeof(struct extendedAttrHeaderDesc); 721da177e4SLinus Torvalds eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); 736c79e987SMarcin Slusarz if (sbi->s_udfrev >= 0x0200) 741da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(3); 751da177e4SLinus Torvalds else 761da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(2); 774b11111aSMarcin Slusarz eahd->descTag.tagSerialNum = 784b11111aSMarcin Slusarz cpu_to_le16(sbi->s_serial_number); 794b11111aSMarcin Slusarz eahd->descTag.tagLocation = cpu_to_le32( 8048d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum); 811da177e4SLinus Torvalds eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); 821da177e4SLinus Torvalds eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 8548d6d8ffSMarcin Slusarz offset = iinfo->i_lenEAttr; 86cb00ea35SCyrill Gorcunov if (type < 2048) { 874b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 8848d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 894b11111aSMarcin Slusarz uint32_t aal = 904b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 9128de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 9228de7948SCyrill Gorcunov &ea[aal], offset - aal); 931da177e4SLinus Torvalds offset -= aal; 944b11111aSMarcin Slusarz eahd->appAttrLocation = 954b11111aSMarcin Slusarz cpu_to_le32(aal + size); 961da177e4SLinus Torvalds } 974b11111aSMarcin Slusarz if (le32_to_cpu(eahd->impAttrLocation) < 9848d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 994b11111aSMarcin Slusarz uint32_t ial = 1004b11111aSMarcin Slusarz le32_to_cpu(eahd->impAttrLocation); 10128de7948SCyrill Gorcunov memmove(&ea[offset - ial + size], 10228de7948SCyrill Gorcunov &ea[ial], offset - ial); 1031da177e4SLinus Torvalds offset -= ial; 1044b11111aSMarcin Slusarz eahd->impAttrLocation = 1054b11111aSMarcin Slusarz cpu_to_le32(ial + size); 1061da177e4SLinus Torvalds } 107cb00ea35SCyrill Gorcunov } else if (type < 65536) { 1084b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 10948d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 1104b11111aSMarcin Slusarz uint32_t aal = 1114b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 11228de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 11328de7948SCyrill Gorcunov &ea[aal], offset - aal); 1141da177e4SLinus Torvalds offset -= aal; 1154b11111aSMarcin Slusarz eahd->appAttrLocation = 1164b11111aSMarcin Slusarz cpu_to_le32(aal + size); 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds /* rewrite CRC + checksum of eahd */ 1205ca4e4beSPekka Enberg crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(struct tag); 1211da177e4SLinus Torvalds eahd->descTag.descCRCLength = cpu_to_le16(crclen); 122f845fcedSBob Copeland eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd + 1235ca4e4beSPekka Enberg sizeof(struct tag), crclen)); 1243f2587bbSMarcin Slusarz eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); 12548d6d8ffSMarcin Slusarz iinfo->i_lenEAttr += size; 1261da177e4SLinus Torvalds return (struct genericFormat *)&ea[offset]; 1271da177e4SLinus Torvalds } 12828de7948SCyrill Gorcunov 1291da177e4SLinus Torvalds return NULL; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 132cb00ea35SCyrill Gorcunov struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, 133cb00ea35SCyrill Gorcunov uint8_t subtype) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds struct genericFormat *gaf; 1361da177e4SLinus Torvalds uint8_t *ea = NULL; 1371da177e4SLinus Torvalds uint32_t offset; 13848d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 1391da177e4SLinus Torvalds 140382a2287SJan Kara ea = iinfo->i_data; 1411da177e4SLinus Torvalds 14248d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 1431da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 1441da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* check checksum/crc */ 1475e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 1485e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 1494b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 15048d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum) 1511da177e4SLinus Torvalds return NULL; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (type < 2048) 1541da177e4SLinus Torvalds offset = sizeof(struct extendedAttrHeaderDesc); 1551da177e4SLinus Torvalds else if (type < 65536) 1561da177e4SLinus Torvalds offset = le32_to_cpu(eahd->impAttrLocation); 1571da177e4SLinus Torvalds else 1581da177e4SLinus Torvalds offset = le32_to_cpu(eahd->appAttrLocation); 1591da177e4SLinus Torvalds 16058bc6d1bSStian Skjelstad while (offset + sizeof(*gaf) < iinfo->i_lenEAttr) { 16158bc6d1bSStian Skjelstad uint32_t attrLength; 16258bc6d1bSStian Skjelstad 1631da177e4SLinus Torvalds gaf = (struct genericFormat *)&ea[offset]; 16458bc6d1bSStian Skjelstad attrLength = le32_to_cpu(gaf->attrLength); 16558bc6d1bSStian Skjelstad 16658bc6d1bSStian Skjelstad /* Detect undersized elements and buffer overflows */ 16758bc6d1bSStian Skjelstad if ((attrLength < sizeof(*gaf)) || 16858bc6d1bSStian Skjelstad (attrLength > (iinfo->i_lenEAttr - offset))) 16958bc6d1bSStian Skjelstad break; 17058bc6d1bSStian Skjelstad 1714b11111aSMarcin Slusarz if (le32_to_cpu(gaf->attrType) == type && 1724b11111aSMarcin Slusarz gaf->attrSubtype == subtype) 1731da177e4SLinus Torvalds return gaf; 1741da177e4SLinus Torvalds else 17558bc6d1bSStian Skjelstad offset += attrLength; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds } 17828de7948SCyrill Gorcunov 1791da177e4SLinus Torvalds return NULL; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * udf_read_tagged 1841da177e4SLinus Torvalds * 1851da177e4SLinus Torvalds * PURPOSE 1861da177e4SLinus Torvalds * Read the first block of a tagged descriptor. 1871da177e4SLinus Torvalds * 1881da177e4SLinus Torvalds * HISTORY 1891da177e4SLinus Torvalds * July 1, 1997 - Andrew E. Mileski 1901da177e4SLinus Torvalds * Written, tested, and released. 1911da177e4SLinus Torvalds */ 192cb00ea35SCyrill Gorcunov struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, 193cb00ea35SCyrill Gorcunov uint32_t location, uint16_t *ident) 1941da177e4SLinus Torvalds { 1955ca4e4beSPekka Enberg struct tag *tag_p; 1961da177e4SLinus Torvalds struct buffer_head *bh = NULL; 1977e273e3bSJoe Perches u8 checksum; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* Read the block */ 2001da177e4SLinus Torvalds if (block == 0xFFFFFFFF) 2011da177e4SLinus Torvalds return NULL; 2021da177e4SLinus Torvalds 203*101ee137SJan Kara bh = sb_bread(sb, block); 204cb00ea35SCyrill Gorcunov if (!bh) { 205fcbf7637SSteve Magnani udf_err(sb, "read failed, block=%u, location=%u\n", 206f4bcbbd9SSebastian Manciulea block, location); 2071da177e4SLinus Torvalds return NULL; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2105ca4e4beSPekka Enberg tag_p = (struct tag *)(bh->b_data); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds *ident = le16_to_cpu(tag_p->tagIdent); 2131da177e4SLinus Torvalds 214cb00ea35SCyrill Gorcunov if (location != le32_to_cpu(tag_p->tagLocation)) { 2151da177e4SLinus Torvalds udf_debug("location mismatch block %u, tag %u != %u\n", 216f4bcbbd9SSebastian Manciulea block, le32_to_cpu(tag_p->tagLocation), location); 2171da177e4SLinus Torvalds goto error_out; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* Verify the tag checksum */ 2217e273e3bSJoe Perches checksum = udf_tag_checksum(tag_p); 2227e273e3bSJoe Perches if (checksum != tag_p->tagChecksum) { 2238076c363SJoe Perches udf_err(sb, "tag checksum failed, block %u: 0x%02x != 0x%02x\n", 2247e273e3bSJoe Perches block, checksum, tag_p->tagChecksum); 2251da177e4SLinus Torvalds goto error_out; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* Verify the tag version */ 2295e0f0017SMarcin Slusarz if (tag_p->descVersion != cpu_to_le16(0x0002U) && 2305e0f0017SMarcin Slusarz tag_p->descVersion != cpu_to_le16(0x0003U)) { 2318076c363SJoe Perches udf_err(sb, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n", 2321da177e4SLinus Torvalds le16_to_cpu(tag_p->descVersion), block); 2331da177e4SLinus Torvalds goto error_out; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* Verify the descriptor CRC */ 2375ca4e4beSPekka Enberg if (le16_to_cpu(tag_p->descCRCLength) + sizeof(struct tag) > sb->s_blocksize || 238f845fcedSBob Copeland le16_to_cpu(tag_p->descCRC) == crc_itu_t(0, 2395ca4e4beSPekka Enberg bh->b_data + sizeof(struct tag), 240f845fcedSBob Copeland le16_to_cpu(tag_p->descCRCLength))) 2411da177e4SLinus Torvalds return bh; 2424b11111aSMarcin Slusarz 243fcbf7637SSteve Magnani udf_debug("Crc failure block %u: crc = %u, crclen = %u\n", block, 2448076c363SJoe Perches le16_to_cpu(tag_p->descCRC), 2458076c363SJoe Perches le16_to_cpu(tag_p->descCRCLength)); 2461da177e4SLinus Torvalds error_out: 2471da177e4SLinus Torvalds brelse(bh); 2481da177e4SLinus Torvalds return NULL; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 25197e961fdSPekka Enberg struct buffer_head *udf_read_ptagged(struct super_block *sb, 25297e961fdSPekka Enberg struct kernel_lb_addr *loc, 253cb00ea35SCyrill Gorcunov uint32_t offset, uint16_t *ident) 2541da177e4SLinus Torvalds { 2551da177e4SLinus Torvalds return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), 25697e961fdSPekka Enberg loc->logicalBlockNum + offset, ident); 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds void udf_update_tag(char *data, int length) 2601da177e4SLinus Torvalds { 2615ca4e4beSPekka Enberg struct tag *tptr = (struct tag *)data; 2625ca4e4beSPekka Enberg length -= sizeof(struct tag); 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds tptr->descCRCLength = cpu_to_le16(length); 2655ca4e4beSPekka Enberg tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(struct tag), length)); 2663f2587bbSMarcin Slusarz tptr->tagChecksum = udf_tag_checksum(tptr); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, 2701da177e4SLinus Torvalds uint32_t loc, int length) 2711da177e4SLinus Torvalds { 2725ca4e4beSPekka Enberg struct tag *tptr = (struct tag *)data; 2731da177e4SLinus Torvalds tptr->tagIdent = cpu_to_le16(ident); 2741da177e4SLinus Torvalds tptr->descVersion = cpu_to_le16(version); 2751da177e4SLinus Torvalds tptr->tagSerialNum = cpu_to_le16(snum); 2761da177e4SLinus Torvalds tptr->tagLocation = cpu_to_le32(loc); 2771da177e4SLinus Torvalds udf_update_tag(data, length); 2781da177e4SLinus Torvalds } 2793f2587bbSMarcin Slusarz 2805ca4e4beSPekka Enberg u8 udf_tag_checksum(const struct tag *t) 2813f2587bbSMarcin Slusarz { 2823f2587bbSMarcin Slusarz u8 *data = (u8 *)t; 2833f2587bbSMarcin Slusarz u8 checksum = 0; 2843f2587bbSMarcin Slusarz int i; 2855ca4e4beSPekka Enberg for (i = 0; i < sizeof(struct tag); ++i) 2863f2587bbSMarcin Slusarz if (i != 4) /* position of checksum */ 2873f2587bbSMarcin Slusarz checksum += data[i]; 2883f2587bbSMarcin Slusarz return checksum; 2893f2587bbSMarcin Slusarz } 290