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/udf_fs.h> 271da177e4SLinus Torvalds #include <linux/buffer_head.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; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds ea = UDF_I_DATA(inode); 5628de7948SCyrill Gorcunov if (UDF_I_LENEATTR(inode)) { 571da177e4SLinus Torvalds ad = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode); 5828de7948SCyrill Gorcunov } else { 591da177e4SLinus Torvalds ad = ea; 601da177e4SLinus Torvalds size += sizeof(struct extendedAttrHeaderDesc); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - 641da177e4SLinus Torvalds UDF_I_LENALLOC(inode); 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds /* TODO - Check for FreeEASpace */ 671da177e4SLinus Torvalds 68cb00ea35SCyrill Gorcunov if (loc & 0x01 && offset >= size) { 691da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 701da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 711da177e4SLinus Torvalds 724b11111aSMarcin Slusarz if (UDF_I_LENALLOC(inode)) 731da177e4SLinus Torvalds memmove(&ad[size], ad, UDF_I_LENALLOC(inode)); 741da177e4SLinus Torvalds 75cb00ea35SCyrill Gorcunov if (UDF_I_LENEATTR(inode)) { 761da177e4SLinus Torvalds /* check checksum/crc */ 775e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 785e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 794b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 804b11111aSMarcin Slusarz UDF_I_LOCATION(inode).logicalBlockNum) 811da177e4SLinus Torvalds return NULL; 82cb00ea35SCyrill Gorcunov } else { 836c79e987SMarcin Slusarz struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 846c79e987SMarcin Slusarz 851da177e4SLinus Torvalds size -= sizeof(struct extendedAttrHeaderDesc); 864b11111aSMarcin Slusarz UDF_I_LENEATTR(inode) += 874b11111aSMarcin Slusarz sizeof(struct extendedAttrHeaderDesc); 881da177e4SLinus Torvalds eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); 896c79e987SMarcin Slusarz if (sbi->s_udfrev >= 0x0200) 901da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(3); 911da177e4SLinus Torvalds else 921da177e4SLinus Torvalds eahd->descTag.descVersion = cpu_to_le16(2); 934b11111aSMarcin Slusarz eahd->descTag.tagSerialNum = 944b11111aSMarcin Slusarz cpu_to_le16(sbi->s_serial_number); 954b11111aSMarcin Slusarz eahd->descTag.tagLocation = cpu_to_le32( 964b11111aSMarcin Slusarz UDF_I_LOCATION(inode).logicalBlockNum); 971da177e4SLinus Torvalds eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); 981da177e4SLinus Torvalds eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds offset = UDF_I_LENEATTR(inode); 102cb00ea35SCyrill Gorcunov if (type < 2048) { 1034b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 1044b11111aSMarcin Slusarz UDF_I_LENEATTR(inode)) { 1054b11111aSMarcin Slusarz uint32_t aal = 1064b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 10728de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 10828de7948SCyrill Gorcunov &ea[aal], offset - aal); 1091da177e4SLinus Torvalds offset -= aal; 1104b11111aSMarcin Slusarz eahd->appAttrLocation = 1114b11111aSMarcin Slusarz cpu_to_le32(aal + size); 1121da177e4SLinus Torvalds } 1134b11111aSMarcin Slusarz if (le32_to_cpu(eahd->impAttrLocation) < 1144b11111aSMarcin Slusarz UDF_I_LENEATTR(inode)) { 1154b11111aSMarcin Slusarz uint32_t ial = 1164b11111aSMarcin Slusarz le32_to_cpu(eahd->impAttrLocation); 11728de7948SCyrill Gorcunov memmove(&ea[offset - ial + size], 11828de7948SCyrill Gorcunov &ea[ial], offset - ial); 1191da177e4SLinus Torvalds offset -= ial; 1204b11111aSMarcin Slusarz eahd->impAttrLocation = 1214b11111aSMarcin Slusarz cpu_to_le32(ial + size); 1221da177e4SLinus Torvalds } 123cb00ea35SCyrill Gorcunov } else if (type < 65536) { 1244b11111aSMarcin Slusarz if (le32_to_cpu(eahd->appAttrLocation) < 1254b11111aSMarcin Slusarz UDF_I_LENEATTR(inode)) { 1264b11111aSMarcin Slusarz uint32_t aal = 1274b11111aSMarcin Slusarz le32_to_cpu(eahd->appAttrLocation); 12828de7948SCyrill Gorcunov memmove(&ea[offset - aal + size], 12928de7948SCyrill Gorcunov &ea[aal], offset - aal); 1301da177e4SLinus Torvalds offset -= aal; 1314b11111aSMarcin Slusarz eahd->appAttrLocation = 1324b11111aSMarcin Slusarz cpu_to_le32(aal + size); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds /* rewrite CRC + checksum of eahd */ 1361da177e4SLinus Torvalds crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag); 1371da177e4SLinus Torvalds eahd->descTag.descCRCLength = cpu_to_le16(crclen); 13828de7948SCyrill Gorcunov eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd + 13928de7948SCyrill Gorcunov sizeof(tag), crclen, 0)); 1403f2587bbSMarcin Slusarz eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); 1411da177e4SLinus Torvalds UDF_I_LENEATTR(inode) += size; 1421da177e4SLinus Torvalds return (struct genericFormat *)&ea[offset]; 1431da177e4SLinus Torvalds } 1444b11111aSMarcin Slusarz if (loc & 0x02) 1454b11111aSMarcin Slusarz ; 14628de7948SCyrill Gorcunov 1471da177e4SLinus Torvalds return NULL; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 150cb00ea35SCyrill Gorcunov struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, 151cb00ea35SCyrill Gorcunov uint8_t subtype) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds struct genericFormat *gaf; 1541da177e4SLinus Torvalds uint8_t *ea = NULL; 1551da177e4SLinus Torvalds uint32_t offset; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds ea = UDF_I_DATA(inode); 1581da177e4SLinus Torvalds 159cb00ea35SCyrill Gorcunov if (UDF_I_LENEATTR(inode)) { 1601da177e4SLinus Torvalds struct extendedAttrHeaderDesc *eahd; 1611da177e4SLinus Torvalds eahd = (struct extendedAttrHeaderDesc *)ea; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* check checksum/crc */ 1645e0f0017SMarcin Slusarz if (eahd->descTag.tagIdent != 1655e0f0017SMarcin Slusarz cpu_to_le16(TAG_IDENT_EAHD) || 1664b11111aSMarcin Slusarz le32_to_cpu(eahd->descTag.tagLocation) != 1674b11111aSMarcin Slusarz UDF_I_LOCATION(inode).logicalBlockNum) 1681da177e4SLinus Torvalds return NULL; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds if (type < 2048) 1711da177e4SLinus Torvalds offset = sizeof(struct extendedAttrHeaderDesc); 1721da177e4SLinus Torvalds else if (type < 65536) 1731da177e4SLinus Torvalds offset = le32_to_cpu(eahd->impAttrLocation); 1741da177e4SLinus Torvalds else 1751da177e4SLinus Torvalds offset = le32_to_cpu(eahd->appAttrLocation); 1761da177e4SLinus Torvalds 177cb00ea35SCyrill Gorcunov while (offset < UDF_I_LENEATTR(inode)) { 1781da177e4SLinus Torvalds gaf = (struct genericFormat *)&ea[offset]; 1794b11111aSMarcin Slusarz if (le32_to_cpu(gaf->attrType) == type && 1804b11111aSMarcin Slusarz gaf->attrSubtype == subtype) 1811da177e4SLinus Torvalds return gaf; 1821da177e4SLinus Torvalds else 1831da177e4SLinus Torvalds offset += le32_to_cpu(gaf->attrLength); 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds } 18628de7948SCyrill Gorcunov 1871da177e4SLinus Torvalds return NULL; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * udf_read_tagged 1921da177e4SLinus Torvalds * 1931da177e4SLinus Torvalds * PURPOSE 1941da177e4SLinus Torvalds * Read the first block of a tagged descriptor. 1951da177e4SLinus Torvalds * 1961da177e4SLinus Torvalds * HISTORY 1971da177e4SLinus Torvalds * July 1, 1997 - Andrew E. Mileski 1981da177e4SLinus Torvalds * Written, tested, and released. 1991da177e4SLinus Torvalds */ 200cb00ea35SCyrill Gorcunov struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, 201cb00ea35SCyrill Gorcunov uint32_t location, uint16_t *ident) 2021da177e4SLinus Torvalds { 2031da177e4SLinus Torvalds tag *tag_p; 2041da177e4SLinus Torvalds struct buffer_head *bh = NULL; 2056c79e987SMarcin Slusarz struct udf_sb_info *sbi = UDF_SB(sb); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* Read the block */ 2081da177e4SLinus Torvalds if (block == 0xFFFFFFFF) 2091da177e4SLinus Torvalds return NULL; 2101da177e4SLinus Torvalds 2116c79e987SMarcin Slusarz bh = udf_tread(sb, block + sbi->s_session); 212cb00ea35SCyrill Gorcunov if (!bh) { 213cb00ea35SCyrill Gorcunov udf_debug("block=%d, location=%d: read failed\n", 2146c79e987SMarcin Slusarz block + sbi->s_session, location); 2151da177e4SLinus Torvalds return NULL; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds tag_p = (tag *)(bh->b_data); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds *ident = le16_to_cpu(tag_p->tagIdent); 2211da177e4SLinus Torvalds 222cb00ea35SCyrill Gorcunov if (location != le32_to_cpu(tag_p->tagLocation)) { 2231da177e4SLinus Torvalds udf_debug("location mismatch block %u, tag %u != %u\n", 2244b11111aSMarcin Slusarz block + sbi->s_session, 2254b11111aSMarcin Slusarz 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 || 2451da177e4SLinus Torvalds le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag), 2464b11111aSMarcin Slusarz le16_to_cpu(tag_p->descCRCLength), 0)) 2471da177e4SLinus Torvalds return bh; 2484b11111aSMarcin Slusarz 2491da177e4SLinus Torvalds udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", 2506c79e987SMarcin Slusarz block + sbi->s_session, le16_to_cpu(tag_p->descCRC), 251cb00ea35SCyrill Gorcunov 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); 2711da177e4SLinus Torvalds tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0)); 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