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296 lines
7.7 KiB
296 lines
7.7 KiB
/* |
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* misc.c |
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* |
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* PURPOSE |
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* Miscellaneous routines for the OSTA-UDF(tm) filesystem. |
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* |
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* COPYRIGHT |
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* This file is distributed under the terms of the GNU General Public |
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* License (GPL). Copies of the GPL can be obtained from: |
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* ftp://prep.ai.mit.edu/pub/gnu/GPL |
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* Each contributing author retains all rights to their own work. |
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* |
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* (C) 1998 Dave Boynton |
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* (C) 1998-2004 Ben Fennema |
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* (C) 1999-2000 Stelias Computing Inc |
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* |
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* HISTORY |
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* |
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* 04/19/99 blf partial support for reading/writing specific EA's |
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*/ |
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#include "udfdecl.h" |
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#include <linux/fs.h> |
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#include <linux/string.h> |
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#include <linux/crc-itu-t.h> |
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#include "udf_i.h" |
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#include "udf_sb.h" |
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struct buffer_head *udf_tgetblk(struct super_block *sb, udf_pblk_t block) |
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{ |
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) |
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return sb_getblk(sb, udf_fixed_to_variable(block)); |
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else |
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return sb_getblk(sb, block); |
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} |
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struct buffer_head *udf_tread(struct super_block *sb, udf_pblk_t block) |
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{ |
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV)) |
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return sb_bread(sb, udf_fixed_to_variable(block)); |
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else |
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return sb_bread(sb, block); |
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} |
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struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size, |
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uint32_t type, uint8_t loc) |
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{ |
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uint8_t *ea = NULL, *ad = NULL; |
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int offset; |
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uint16_t crclen; |
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struct udf_inode_info *iinfo = UDF_I(inode); |
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ea = iinfo->i_data; |
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if (iinfo->i_lenEAttr) { |
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ad = iinfo->i_data + iinfo->i_lenEAttr; |
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} else { |
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ad = ea; |
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size += sizeof(struct extendedAttrHeaderDesc); |
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} |
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offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) - |
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iinfo->i_lenAlloc; |
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/* TODO - Check for FreeEASpace */ |
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if (loc & 0x01 && offset >= size) { |
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struct extendedAttrHeaderDesc *eahd; |
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eahd = (struct extendedAttrHeaderDesc *)ea; |
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if (iinfo->i_lenAlloc) |
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memmove(&ad[size], ad, iinfo->i_lenAlloc); |
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if (iinfo->i_lenEAttr) { |
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/* check checksum/crc */ |
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if (eahd->descTag.tagIdent != |
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cpu_to_le16(TAG_IDENT_EAHD) || |
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le32_to_cpu(eahd->descTag.tagLocation) != |
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iinfo->i_location.logicalBlockNum) |
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return NULL; |
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} else { |
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struct udf_sb_info *sbi = UDF_SB(inode->i_sb); |
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size -= sizeof(struct extendedAttrHeaderDesc); |
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iinfo->i_lenEAttr += |
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sizeof(struct extendedAttrHeaderDesc); |
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eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD); |
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if (sbi->s_udfrev >= 0x0200) |
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eahd->descTag.descVersion = cpu_to_le16(3); |
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else |
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eahd->descTag.descVersion = cpu_to_le16(2); |
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eahd->descTag.tagSerialNum = |
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cpu_to_le16(sbi->s_serial_number); |
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eahd->descTag.tagLocation = cpu_to_le32( |
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iinfo->i_location.logicalBlockNum); |
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eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF); |
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eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF); |
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} |
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offset = iinfo->i_lenEAttr; |
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if (type < 2048) { |
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if (le32_to_cpu(eahd->appAttrLocation) < |
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iinfo->i_lenEAttr) { |
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uint32_t aal = |
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le32_to_cpu(eahd->appAttrLocation); |
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memmove(&ea[offset - aal + size], |
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&ea[aal], offset - aal); |
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offset -= aal; |
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eahd->appAttrLocation = |
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cpu_to_le32(aal + size); |
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} |
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if (le32_to_cpu(eahd->impAttrLocation) < |
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iinfo->i_lenEAttr) { |
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uint32_t ial = |
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le32_to_cpu(eahd->impAttrLocation); |
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memmove(&ea[offset - ial + size], |
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&ea[ial], offset - ial); |
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offset -= ial; |
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eahd->impAttrLocation = |
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cpu_to_le32(ial + size); |
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} |
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} else if (type < 65536) { |
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if (le32_to_cpu(eahd->appAttrLocation) < |
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iinfo->i_lenEAttr) { |
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uint32_t aal = |
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le32_to_cpu(eahd->appAttrLocation); |
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memmove(&ea[offset - aal + size], |
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&ea[aal], offset - aal); |
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offset -= aal; |
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eahd->appAttrLocation = |
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cpu_to_le32(aal + size); |
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} |
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} |
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/* rewrite CRC + checksum of eahd */ |
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crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(struct tag); |
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eahd->descTag.descCRCLength = cpu_to_le16(crclen); |
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eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd + |
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sizeof(struct tag), crclen)); |
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eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag); |
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iinfo->i_lenEAttr += size; |
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return (struct genericFormat *)&ea[offset]; |
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} |
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return NULL; |
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} |
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struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type, |
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uint8_t subtype) |
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{ |
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struct genericFormat *gaf; |
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uint8_t *ea = NULL; |
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uint32_t offset; |
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struct udf_inode_info *iinfo = UDF_I(inode); |
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ea = iinfo->i_data; |
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if (iinfo->i_lenEAttr) { |
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struct extendedAttrHeaderDesc *eahd; |
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eahd = (struct extendedAttrHeaderDesc *)ea; |
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/* check checksum/crc */ |
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if (eahd->descTag.tagIdent != |
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cpu_to_le16(TAG_IDENT_EAHD) || |
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le32_to_cpu(eahd->descTag.tagLocation) != |
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iinfo->i_location.logicalBlockNum) |
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return NULL; |
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if (type < 2048) |
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offset = sizeof(struct extendedAttrHeaderDesc); |
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else if (type < 65536) |
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offset = le32_to_cpu(eahd->impAttrLocation); |
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else |
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offset = le32_to_cpu(eahd->appAttrLocation); |
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while (offset < iinfo->i_lenEAttr) { |
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gaf = (struct genericFormat *)&ea[offset]; |
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if (le32_to_cpu(gaf->attrType) == type && |
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gaf->attrSubtype == subtype) |
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return gaf; |
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else |
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offset += le32_to_cpu(gaf->attrLength); |
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} |
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} |
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return NULL; |
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} |
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/* |
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* udf_read_tagged |
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* |
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* PURPOSE |
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* Read the first block of a tagged descriptor. |
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* |
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* HISTORY |
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* July 1, 1997 - Andrew E. Mileski |
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* Written, tested, and released. |
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*/ |
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struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block, |
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uint32_t location, uint16_t *ident) |
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{ |
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struct tag *tag_p; |
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struct buffer_head *bh = NULL; |
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u8 checksum; |
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/* Read the block */ |
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if (block == 0xFFFFFFFF) |
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return NULL; |
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bh = udf_tread(sb, block); |
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if (!bh) { |
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udf_err(sb, "read failed, block=%u, location=%u\n", |
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block, location); |
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return NULL; |
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} |
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tag_p = (struct tag *)(bh->b_data); |
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*ident = le16_to_cpu(tag_p->tagIdent); |
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if (location != le32_to_cpu(tag_p->tagLocation)) { |
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udf_debug("location mismatch block %u, tag %u != %u\n", |
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block, le32_to_cpu(tag_p->tagLocation), location); |
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goto error_out; |
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} |
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/* Verify the tag checksum */ |
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checksum = udf_tag_checksum(tag_p); |
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if (checksum != tag_p->tagChecksum) { |
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udf_err(sb, "tag checksum failed, block %u: 0x%02x != 0x%02x\n", |
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block, checksum, tag_p->tagChecksum); |
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goto error_out; |
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} |
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/* Verify the tag version */ |
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if (tag_p->descVersion != cpu_to_le16(0x0002U) && |
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tag_p->descVersion != cpu_to_le16(0x0003U)) { |
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udf_err(sb, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n", |
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le16_to_cpu(tag_p->descVersion), block); |
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goto error_out; |
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} |
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/* Verify the descriptor CRC */ |
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if (le16_to_cpu(tag_p->descCRCLength) + sizeof(struct tag) > sb->s_blocksize || |
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le16_to_cpu(tag_p->descCRC) == crc_itu_t(0, |
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bh->b_data + sizeof(struct tag), |
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le16_to_cpu(tag_p->descCRCLength))) |
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return bh; |
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udf_debug("Crc failure block %u: crc = %u, crclen = %u\n", block, |
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le16_to_cpu(tag_p->descCRC), |
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le16_to_cpu(tag_p->descCRCLength)); |
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error_out: |
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brelse(bh); |
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return NULL; |
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} |
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struct buffer_head *udf_read_ptagged(struct super_block *sb, |
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struct kernel_lb_addr *loc, |
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uint32_t offset, uint16_t *ident) |
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{ |
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return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset), |
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loc->logicalBlockNum + offset, ident); |
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} |
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void udf_update_tag(char *data, int length) |
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{ |
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struct tag *tptr = (struct tag *)data; |
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length -= sizeof(struct tag); |
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tptr->descCRCLength = cpu_to_le16(length); |
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tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(struct tag), length)); |
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tptr->tagChecksum = udf_tag_checksum(tptr); |
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} |
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void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum, |
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uint32_t loc, int length) |
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{ |
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struct tag *tptr = (struct tag *)data; |
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tptr->tagIdent = cpu_to_le16(ident); |
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tptr->descVersion = cpu_to_le16(version); |
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tptr->tagSerialNum = cpu_to_le16(snum); |
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tptr->tagLocation = cpu_to_le32(loc); |
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udf_update_tag(data, length); |
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} |
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u8 udf_tag_checksum(const struct tag *t) |
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{ |
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u8 *data = (u8 *)t; |
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u8 checksum = 0; |
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int i; |
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for (i = 0; i < sizeof(struct tag); ++i) |
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if (i != 4) /* position of checksum */ |
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checksum += data[i]; |
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return checksum; |
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}
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