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> 261da177e4SLinus Torvalds #include <linux/buffer_head.h> 27f845fcedSBob Copeland #include <linux/crc-itu-t.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include "udf_i.h" 301da177e4SLinus Torvalds #include "udf_sb.h" 311da177e4SLinus Torvalds 32cb00ea35SCyrill Gorcunov struct buffer_head *udf_tgetblk(struct super_block *sb, int block) 331da177e4SLinus Torvalds { 341da177e4SLinus Torvalds if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) 351da177e4SLinus Torvalds return sb_getblk(sb, udf_fixed_to_variable(block)); 361da177e4SLinus Torvalds else 371da177e4SLinus Torvalds return sb_getblk(sb, block); 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds 40cb00ea35SCyrill Gorcunov struct buffer_head *udf_tread(struct super_block *sb, int block) 411da177e4SLinus Torvalds { 421da177e4SLinus Torvalds if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) 431da177e4SLinus Torvalds return sb_bread(sb, udf_fixed_to_variable(block)); 441da177e4SLinus Torvalds else 451da177e4SLinus Torvalds return sb_bread(sb, block); 461da177e4SLinus Torvalds } 471da177e4SLinus Torvalds 48cb00ea35SCyrill Gorcunov struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size, 49cb00ea35SCyrill Gorcunov uint32_t type, uint8_t loc) 501da177e4SLinus Torvalds { 511da177e4SLinus Torvalds uint8_t *ea = NULL, *ad = NULL; 521da177e4SLinus Torvalds int offset; 531da177e4SLinus Torvalds uint16_t crclen; 5448d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 551da177e4SLinus Torvalds 5648d6d8ffSMarcin Slusarz ea = iinfo->i_ext.i_data; 5748d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 5848d6d8ffSMarcin Slusarz ad = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 5928de7948SCyrill Gorcunov } else { 601da177e4SLinus Torvalds ad = ea; 611da177e4SLinus Torvalds size += sizeof(struct extendedAttrHeaderDesc); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - 6548d6d8ffSMarcin Slusarz iinfo->i_lenAlloc; 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds /* TODO - Check for FreeEASpace */ 681da177e4SLinus Torvalds 69cb00ea35SCyrill Gorcunov if (loc & 0x01 && offset >= size) { 701da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 711da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 721da177e4SLinus Torvalds 7348d6d8ffSMarcin Slusarz if (iinfo->i_lenAlloc) 7448d6d8ffSMarcin Slusarz memmove(&ad[size], ad, iinfo->i_lenAlloc); 751da177e4SLinus Torvalds 7648d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 771da177e4SLinus Torvalds /* check checksum/crc */ 785e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 795e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 804b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 8148d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum) 821da177e4SLinus Torvalds return NULL; 83cb00ea35SCyrill Gorcunov } else { 846c79e987SMarcin Slusarz struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 856c79e987SMarcin Slusarz 861da177e4SLinus Torvalds size -= sizeof(struct extendedAttrHeaderDesc); 8748d6d8ffSMarcin Slusarz iinfo->i_lenEAttr += 884b11111aSMarcin Slusarz sizeof(struct extendedAttrHeaderDesc); 891da177e4SLinus Torvalds eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); 906c79e987SMarcin Slusarz if (sbi->s_udfrev >= 0x0200) 911da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(3); 921da177e4SLinus Torvalds else 931da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(2); 944b11111aSMarcin Slusarz eahd->descTag.tagSerialNum = 954b11111aSMarcin Slusarz cpu_to_le16(sbi->s_serial_number); 964b11111aSMarcin Slusarz eahd->descTag.tagLocation = cpu_to_le32( 9748d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum); 981da177e4SLinus Torvalds eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); 991da177e4SLinus Torvalds eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 10248d6d8ffSMarcin Slusarz offset = iinfo->i_lenEAttr; 103cb00ea35SCyrill Gorcunov if (type < 2048) { 1044b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 10548d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 1064b11111aSMarcin Slusarz uint32_t aal = 1074b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 10828de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 10928de7948SCyrill Gorcunov &ea[aal], offset - aal); 1101da177e4SLinus Torvalds offset -= aal; 1114b11111aSMarcin Slusarz eahd->appAttrLocation = 1124b11111aSMarcin Slusarz cpu_to_le32(aal + size); 1131da177e4SLinus Torvalds } 1144b11111aSMarcin Slusarz if (le32_to_cpu(eahd->impAttrLocation) < 11548d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 1164b11111aSMarcin Slusarz uint32_t ial = 1174b11111aSMarcin Slusarz le32_to_cpu(eahd->impAttrLocation); 11828de7948SCyrill Gorcunov memmove(&ea[offset - ial + size], 11928de7948SCyrill Gorcunov &ea[ial], offset - ial); 1201da177e4SLinus Torvalds offset -= ial; 1214b11111aSMarcin Slusarz eahd->impAttrLocation = 1224b11111aSMarcin Slusarz cpu_to_le32(ial + size); 1231da177e4SLinus Torvalds } 124cb00ea35SCyrill Gorcunov } else if (type < 65536) { 1254b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 12648d6d8ffSMarcin Slusarz iinfo->i_lenEAttr) { 1274b11111aSMarcin Slusarz uint32_t aal = 1284b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 12928de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 13028de7948SCyrill Gorcunov &ea[aal], offset - aal); 1311da177e4SLinus Torvalds offset -= aal; 1324b11111aSMarcin Slusarz eahd->appAttrLocation = 1334b11111aSMarcin Slusarz cpu_to_le32(aal + size); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds /* rewrite CRC + checksum of eahd */ 1371da177e4SLinus Torvalds crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag); 1381da177e4SLinus Torvalds eahd->descTag.descCRCLength = cpu_to_le16(crclen); 139f845fcedSBob Copeland eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd + 140f845fcedSBob Copeland sizeof(tag), crclen)); 1413f2587bbSMarcin Slusarz eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); 14248d6d8ffSMarcin Slusarz iinfo->i_lenEAttr += size; 1431da177e4SLinus Torvalds return (struct genericFormat *)&ea[offset]; 1441da177e4SLinus Torvalds } 1454b11111aSMarcin Slusarz if (loc & 0x02) 1464b11111aSMarcin Slusarz ; 14728de7948SCyrill Gorcunov 1481da177e4SLinus Torvalds return NULL; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 151cb00ea35SCyrill Gorcunov struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, 152cb00ea35SCyrill Gorcunov uint8_t subtype) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct genericFormat *gaf; 1551da177e4SLinus Torvalds uint8_t *ea = NULL; 1561da177e4SLinus Torvalds uint32_t offset; 15748d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 1581da177e4SLinus Torvalds 15948d6d8ffSMarcin Slusarz ea = iinfo->i_ext.i_data; 1601da177e4SLinus Torvalds 16148d6d8ffSMarcin Slusarz if (iinfo->i_lenEAttr) { 1621da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 1631da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* check checksum/crc */ 1665e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 1675e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 1684b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 16948d6d8ffSMarcin Slusarz iinfo->i_location.logicalBlockNum) 1701da177e4SLinus Torvalds return NULL; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds if (type < 2048) 1731da177e4SLinus Torvalds offset = sizeof(struct extendedAttrHeaderDesc); 1741da177e4SLinus Torvalds else if (type < 65536) 1751da177e4SLinus Torvalds offset = le32_to_cpu(eahd->impAttrLocation); 1761da177e4SLinus Torvalds else 1771da177e4SLinus Torvalds offset = le32_to_cpu(eahd->appAttrLocation); 1781da177e4SLinus Torvalds 17948d6d8ffSMarcin Slusarz while (offset < iinfo->i_lenEAttr) { 1801da177e4SLinus Torvalds gaf = (struct genericFormat *)&ea[offset]; 1814b11111aSMarcin Slusarz if (le32_to_cpu(gaf->attrType) == type && 1824b11111aSMarcin Slusarz gaf->attrSubtype == subtype) 1831da177e4SLinus Torvalds return gaf; 1841da177e4SLinus Torvalds else 1851da177e4SLinus Torvalds offset += le32_to_cpu(gaf->attrLength); 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds } 18828de7948SCyrill Gorcunov 1891da177e4SLinus Torvalds return NULL; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* 1931da177e4SLinus Torvalds * udf_read_tagged 1941da177e4SLinus Torvalds * 1951da177e4SLinus Torvalds * PURPOSE 1961da177e4SLinus Torvalds * Read the first block of a tagged descriptor. 1971da177e4SLinus Torvalds * 1981da177e4SLinus Torvalds * HISTORY 1991da177e4SLinus Torvalds * July 1, 1997 - Andrew E. Mileski 2001da177e4SLinus Torvalds * Written, tested, and released. 2011da177e4SLinus Torvalds */ 202cb00ea35SCyrill Gorcunov struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, 203cb00ea35SCyrill Gorcunov uint32_t location, uint16_t *ident) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds tag *tag_p; 2061da177e4SLinus Torvalds struct buffer_head *bh = NULL; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* Read the block */ 2091da177e4SLinus Torvalds if (block == 0xFFFFFFFF) 2101da177e4SLinus Torvalds return NULL; 2111da177e4SLinus Torvalds 212f4bcbbd9SSebastian Manciulea bh = udf_tread(sb, block); 213cb00ea35SCyrill Gorcunov if (!bh) { 214cb00ea35SCyrill Gorcunov udf_debug("block=%d, location=%d: read failed\n", 215f4bcbbd9SSebastian Manciulea block, location); 2161da177e4SLinus Torvalds return NULL; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds tag_p = (tag *)(bh->b_data); 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds *ident = le16_to_cpu(tag_p->tagIdent); 2221da177e4SLinus Torvalds 223cb00ea35SCyrill Gorcunov if (location != le32_to_cpu(tag_p->tagLocation)) { 2241da177e4SLinus Torvalds udf_debug("location mismatch block %u, tag %u != %u\n", 225f4bcbbd9SSebastian Manciulea block, le32_to_cpu(tag_p->tagLocation), location); 2261da177e4SLinus Torvalds goto error_out; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds /* Verify the tag checksum */ 2303f2587bbSMarcin Slusarz if (udf_tag_checksum(tag_p) != tag_p->tagChecksum) { 2311da177e4SLinus Torvalds printk(KERN_ERR "udf: tag checksum failed block %d\n", block); 2321da177e4SLinus Torvalds goto error_out; 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* Verify the tag version */ 2365e0f0017SMarcin Slusarz if (tag_p->descVersion != cpu_to_le16(0x0002U) && 2375e0f0017SMarcin Slusarz tag_p->descVersion != cpu_to_le16(0x0003U)) { 2381da177e4SLinus Torvalds udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n", 2391da177e4SLinus Torvalds le16_to_cpu(tag_p->descVersion), block); 2401da177e4SLinus Torvalds goto error_out; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /* Verify the descriptor CRC */ 2441da177e4SLinus Torvalds if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize || 245f845fcedSBob Copeland le16_to_cpu(tag_p->descCRC) == crc_itu_t(0, 246f845fcedSBob Copeland bh->b_data + sizeof(tag), 247f845fcedSBob Copeland le16_to_cpu(tag_p->descCRCLength))) 2481da177e4SLinus Torvalds return bh; 2494b11111aSMarcin Slusarz 250f4bcbbd9SSebastian Manciulea udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", block, 251f4bcbbd9SSebastian Manciulea le16_to_cpu(tag_p->descCRC), le16_to_cpu(tag_p->descCRCLength)); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds error_out: 2541da177e4SLinus Torvalds brelse(bh); 2551da177e4SLinus Torvalds return NULL; 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 258cb00ea35SCyrill Gorcunov struct buffer_head *udf_read_ptagged(struct super_block *sb, kernel_lb_addr loc, 259cb00ea35SCyrill Gorcunov uint32_t offset, uint16_t *ident) 2601da177e4SLinus Torvalds { 2611da177e4SLinus Torvalds return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), 2621da177e4SLinus Torvalds loc.logicalBlockNum + offset, ident); 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds void udf_update_tag(char *data, int length) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds tag *tptr = (tag *)data; 2681da177e4SLinus Torvalds length -= sizeof(tag); 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds tptr->descCRCLength = cpu_to_le16(length); 271f845fcedSBob Copeland tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(tag), length)); 2723f2587bbSMarcin Slusarz tptr->tagChecksum = udf_tag_checksum(tptr); 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, 2761da177e4SLinus Torvalds uint32_t loc, int length) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds tag *tptr = (tag *)data; 2791da177e4SLinus Torvalds tptr->tagIdent = cpu_to_le16(ident); 2801da177e4SLinus Torvalds tptr->descVersion = cpu_to_le16(version); 2811da177e4SLinus Torvalds tptr->tagSerialNum = cpu_to_le16(snum); 2821da177e4SLinus Torvalds tptr->tagLocation = cpu_to_le32(loc); 2831da177e4SLinus Torvalds udf_update_tag(data, length); 2841da177e4SLinus Torvalds } 2853f2587bbSMarcin Slusarz 2863f2587bbSMarcin Slusarz u8 udf_tag_checksum(const tag *t) 2873f2587bbSMarcin Slusarz { 2883f2587bbSMarcin Slusarz u8 *data = (u8 *)t; 2893f2587bbSMarcin Slusarz u8 checksum = 0; 2903f2587bbSMarcin Slusarz int i; 2913f2587bbSMarcin Slusarz for (i = 0; i < sizeof(tag); ++i) 2923f2587bbSMarcin Slusarz if (i != 4) /* position of checksum */ 2933f2587bbSMarcin Slusarz checksum += data[i]; 2943f2587bbSMarcin Slusarz return checksum; 2953f2587bbSMarcin Slusarz } 296