inode.c

这是Linux系统下的对UDF文件系统新增的功能

{
	struct fileEntry *fe;
	struct extendedFileEntry *efe;
	time_t convtime;
	long convtime_usec;
	int offset;

	fe = (struct fileEntry *)bh->b_data;
	efe = (struct extendedFileEntry *)bh->b_data;

	if (le16_to_cpu(fe->icbTag.strategyType) == 4)
		UDF_I_STRAT4096(inode) = 0;
	else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
		UDF_I_STRAT4096(inode) = 1;

	UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
	UDF_I_UNIQUE(inode) = 0;
	UDF_I_LENEATTR(inode) = 0;
	UDF_I_LENEXTENTS(inode) = 0;
	UDF_I_LENALLOC(inode) = 0;
	UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
	UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
	if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE)
	{
		UDF_I_EFE(inode) = 1;
		UDF_I_USE(inode) = 0;
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
	}
	else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
	{
		UDF_I_EFE(inode) = 0;
		UDF_I_USE(inode) = 0;
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
	}
	else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
	{
		UDF_I_EFE(inode) = 0;
		UDF_I_USE(inode) = 1;
		UDF_I_LENALLOC(inode) =
			le32_to_cpu(
				((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
		return;
	}

	inode->i_uid = le32_to_cpu(fe->uid);
	if ( inode->i_uid == -1 ) inode->i_uid = UDF_SB(inode->i_sb)->s_uid;

	inode->i_gid = le32_to_cpu(fe->gid);
	if ( inode->i_gid == -1 ) inode->i_gid = UDF_SB(inode->i_sb)->s_gid;

	inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
	if (!inode->i_nlink)
		inode->i_nlink = 1;
	
	inode->i_size = le64_to_cpu(fe->informationLength);
	UDF_I_LENEXTENTS(inode) = inode->i_size;

	inode->i_mode = udf_convert_permissions(fe);
	inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;

	if (UDF_I_EFE(inode) == 0)
	{
		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
			(inode->i_sb->s_blocksize_bits - 9);

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->accessTime)) )
		{
			inode->i_atime.tv_sec = convtime;
			inode->i_atime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->modificationTime)) )
		{
			inode->i_mtime.tv_sec = convtime;
			inode->i_mtime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->attrTime)) )
		{
			inode->i_ctime.tv_sec = convtime;
			inode->i_ctime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
		UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
		UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
		offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
	}
	else
	{
		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 
			(inode->i_sb->s_blocksize_bits - 9);

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->accessTime)) )
		{
			inode->i_atime.tv_sec = convtime;
			inode->i_atime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->modificationTime)) )
		{
			inode->i_mtime.tv_sec = convtime;
			inode->i_mtime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->createTime)) )
		{
			UDF_I_CRTIME(inode).tv_sec = convtime;
			UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
		}
		else
		{
			UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->attrTime)) )
		{
			inode->i_ctime.tv_sec = convtime;
			inode->i_ctime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
		UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
		UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
		offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
	}

	switch (fe->icbTag.fileType)
	{
		case ICBTAG_FILE_TYPE_DIRECTORY:
		{
			inode->i_op = &udf_dir_inode_operations;
			inode->i_fop = &udf_dir_operations;
			inode->i_mode |= S_IFDIR;
			inode->i_nlink ++;
			break;
		}
		case ICBTAG_FILE_TYPE_REALTIME:
		case ICBTAG_FILE_TYPE_REGULAR:
		case ICBTAG_FILE_TYPE_UNDEF:
		{
			if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
				inode->i_data.a_ops = &udf_adinicb_aops;
			else
				inode->i_data.a_ops = &udf_aops;
			inode->i_op = &udf_file_inode_operations;
			inode->i_fop = &udf_file_operations;
			inode->i_mode |= S_IFREG;
			break;
		}
		case ICBTAG_FILE_TYPE_BLOCK:
		{
			inode->i_mode |= S_IFBLK;
			break;
		}
		case ICBTAG_FILE_TYPE_CHAR:
		{
			inode->i_mode |= S_IFCHR;
			break;
		}
		case ICBTAG_FILE_TYPE_FIFO:
		{
			init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
			break;
		}
		case ICBTAG_FILE_TYPE_SOCKET:
		{
			init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
			break;
		}
		case ICBTAG_FILE_TYPE_SYMLINK:
		{
			inode->i_data.a_ops = &udf_symlink_aops;
			inode->i_op = &page_symlink_inode_operations;
			inode->i_mode = S_IFLNK|S_IRWXUGO;
			break;
		}
		default:
		{
			printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
				inode->i_ino, fe->icbTag.fileType);
			make_bad_inode(inode);
			return;
		}
	}
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
	{
		struct deviceSpec *dsea =
			(struct deviceSpec *)
				udf_get_extendedattr(inode, 12, 1);

		if (dsea)
		{
			init_special_inode(inode, inode->i_mode, MKDEV(
				le32_to_cpu(dsea->majorDeviceIdent),
				le32_to_cpu(dsea->minorDeviceIdent)));
			/* Developer ID ??? */
		}
		else
		{
			make_bad_inode(inode);
		}
	}
}

static mode_t
udf_convert_permissions(struct fileEntry *fe)
{
	mode_t mode;
	uint32_t permissions;
	uint32_t flags;

	permissions = le32_to_cpu(fe->permissions);
	flags = le16_to_cpu(fe->icbTag.flags);

	mode =	(( permissions      ) & S_IRWXO) |
		(( permissions >> 2 ) & S_IRWXG) |
		(( permissions >> 4 ) & S_IRWXU) |
		(( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
		(( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
		(( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);

	return mode;
}

/*
 * udf_write_inode
 *
 * PURPOSE
 *	Write out the specified inode.
 *
 * DESCRIPTION
 *	This routine is called whenever an inode is synced.
 *	Currently this routine is just a placeholder.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */

void udf_write_inode(struct inode * inode, int sync)
{
	lock_kernel();
	udf_update_inode(inode, sync);
	unlock_kernel();
}

int udf_sync_inode(struct inode * inode)
{
	return udf_update_inode(inode, 1);
}

static int
udf_update_inode(struct inode *inode, int do_sync)
{
	struct buffer_head *bh = NULL;
	struct fileEntry *fe;
	struct extendedFileEntry *efe;
	uint32_t udfperms;
	uint16_t icbflags;
	uint16_t crclen;
	int i;
	timestamp cpu_time;
	int err = 0;

	bh = udf_tread(inode->i_sb,
		udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));

	if (!bh)
	{
		udf_debug("bread failure\n");
		return -EIO;
	}

	memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);

	fe = (struct fileEntry *)bh->b_data;
	efe = (struct extendedFileEntry *)bh->b_data;

	if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
	{
		struct unallocSpaceEntry *use =
			(struct unallocSpaceEntry *)bh->b_data;

		use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
		crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) -
			sizeof(tag);
		use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
		use->descTag.descCRCLength = cpu_to_le16(crclen);
		use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));

		use->descTag.tagChecksum = 0;
		for (i=0; i<16; i++)
			if (i != 4)
				use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];

		mark_buffer_dirty(bh);
		udf_release_data(bh);
		return err;
	}

	if (inode->i_uid != UDF_SB(inode->i_sb)->s_uid)
		fe->uid = cpu_to_le32(inode->i_uid);

	if (inode->i_gid != UDF_SB(inode->i_sb)->s_gid)
		fe->gid = cpu_to_le32(inode->i_gid);

	udfperms =	((inode->i_mode & S_IRWXO)     ) |
			((inode->i_mode & S_IRWXG) << 2) |
			((inode->i_mode & S_IRWXU) << 4);

	udfperms |=	(le32_to_cpu(fe->permissions) &
			(FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
			 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
			 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
	fe->permissions = cpu_to_le32(udfperms);

	if (S_ISDIR(inode->i_mode))
		fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
	else
		fe->fileLinkCount = cpu_to_le16(inode->i_nlink);

	fe->informationLength = cpu_to_le64(inode->i_size);

	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
	{
		regid *eid;
		struct deviceSpec *dsea =
			(struct deviceSpec *)
				udf_get_extendedattr(inode, 12, 1);	

		if (!dsea)
		{
			dsea = (struct deviceSpec *)
				udf_add_extendedattr(inode,
					sizeof(struct deviceSpec) +
					sizeof(regid), 12, 0x3);
			dsea->attrType = 12;
			dsea->attrSubtype = 1;
			dsea->attrLength = sizeof(struct deviceSpec) +
				sizeof(regid);
			dsea->impUseLength = sizeof(regid);
		}
		eid = (regid *)dsea->impUse;
		memset(eid, 0, sizeof(regid));
		strcpy(eid->ident, UDF_ID_DEVELOPER);
		eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
		eid->identSuffix[1] = UDF_OS_ID_LINUX;
		dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
		dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
	}

	if (UDF_I_EFE(inode) == 0)
	{
		memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
		fe->logicalBlocksRecorded = cpu_to_le64(
			(inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
			(inode->i_sb->s_blocksize_bits - 9));

		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
			fe->accessTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
			fe->modificationTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
			fe->attrTime = cpu_to_lets(cpu_time);
		memset(&(fe->impIdent), 0, sizeof(regid));
		strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
		fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
		fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
		fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
		fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
		fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		fe->descTag.tagIdent = le16_to_cpu(TAG_IDENT_FE);
		crclen = sizeof(struct fileEntry);
	}
	else
	{
		memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
		efe->objectSize = cpu_to_le64(inode->i_size);
		efe->logicalBlocksRecorded = cpu_to_le64(
			(inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
			(inode->i_sb->s_blocksize_bits - 9));

		if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_atime;
		}
		if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_mtime;
		}
		if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_ctime;
		}

		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
			efe->accessTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
			efe->modificationTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
			efe->createTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
			efe->attrTime = cpu_to_lets(cpu_time);

		memset(&(efe->impIdent), 0, sizeof(regid));
		strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
		efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
		efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
		efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
		efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
		efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		efe->descTag.tagIdent = le16_to_cpu(TAG_IDENT_EFE);
		crclen = sizeof(struct extendedFileEntry);
	}
	if (UDF_I_STRAT4096(inode))
	{
		fe->icbTag.strategyType = cpu_to_le16(4096);
		fe->icbTag.strategyParameter = cpu_to_le16(1);
		fe->icbTag.numEntries = cpu_to_le16(2);
	}
	else
	{
		fe->icbTag.strategyType = cpu_to_le16(4);
		fe->icbTag.numEntries = cpu_to_le16(1);
	}

	if (S_ISDIR(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
	else if (S_ISREG(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
	else if (S_ISLNK(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
	else if (S_ISBLK(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
	else if (S_ISCHR(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
	else if (S_ISFIFO(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
	else if (S_ISSOCK(inode->i_mode))
		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;

	icbflags =	UDF_I_ALLOCTYPE(inode) |
			((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
			((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
			((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
			(le16_to_cpu(fe->icbTag.flags) &
				~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
				ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));

	fe->icbTag.flags = cpu_to_le16(icbflags);
	if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
		fe->descTag.descVersion = cpu_to_le16(3);
	else
		fe->descTag.descVersion = cpu_to_le16(2);
	fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
	fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
	crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
	fe->descTag.descCRCLength = cpu_to_le16(crclen);
	fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));

	fe->descTag.tagChecksum = 0;
	for (i=0; i<16; i++)
		if (i != 4)
			fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];

	/* write the data blocks */
	mark_buffer_dirty(bh);
	if (do_sync)
	{
		sync_dirty_buffer(bh);
		if (buffer_req(bh) && !buffer_uptodate(bh))
		{
			printk("IO error syncing udf inode [%s:%08lx]\n",
				inode->i_sb->s_id, inode->i_ino);
			err = -EIO;
		}
	}