inode.c

linux 内核源代码

	/*
	 * Set defaults, but the inode is still incomplete!
	 * Note: get_new_inode() sets the following on a new inode:
	 *      i_sb = sb
	 *      i_no = ino
	 *      i_flags = sb->s_flags
	 *      i_state = 0
	 * clean_inode(): zero fills and sets
	 *      i_count = 1
	 *      i_nlink = 1
	 *      i_op = NULL;
	 */
	bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
	if (!bh) {
		printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
		       inode->i_ino);
		make_bad_inode(inode);
		return;
	}

	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
	    ident != TAG_IDENT_USE) {
		printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
		       inode->i_ino, ident);
		brelse(bh);
		make_bad_inode(inode);
		return;
	}

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

	if (le16_to_cpu(fe->icbTag.strategyType) == 4096) {
		struct buffer_head *ibh = NULL, *nbh = NULL;
		struct indirectEntry *ie;

		ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
		if (ident == TAG_IDENT_IE) {
			if (ibh) {
				kernel_lb_addr loc;
				ie = (struct indirectEntry *)ibh->b_data;

				loc = lelb_to_cpu(ie->indirectICB.extLocation);

				if (ie->indirectICB.extLength &&
				    (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident))) {
					if (ident == TAG_IDENT_FE ||
					    ident == TAG_IDENT_EFE) {
						memcpy(&UDF_I_LOCATION(inode), &loc,
						       sizeof(kernel_lb_addr));
						brelse(bh);
						brelse(ibh);
						brelse(nbh);
						__udf_read_inode(inode);
						return;
					} else {
						brelse(nbh);
						brelse(ibh);
					}
				} else {
					brelse(ibh);
				}
			}
		} else {
			brelse(ibh);
		}
	} else if (le16_to_cpu(fe->icbTag.strategyType) != 4) {
		printk(KERN_ERR "udf: unsupported strategy type: %d\n",
		       le16_to_cpu(fe->icbTag.strategyType));
		brelse(bh);
		make_bad_inode(inode);
		return;
	}
	udf_fill_inode(inode, bh);

	brelse(bh);
}

static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
{
	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;
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry))) {
			make_bad_inode(inode);
			return;
		}
		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;
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct fileEntry))) {
			make_bad_inode(inode);
			return;
		}
		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);
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry))) {
			make_bad_inode(inode);
			return;
		}
		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 ||
	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
		inode->i_uid = UDF_SB(inode->i_sb)->s_uid;

	inode->i_gid = le32_to_cpu(fe->gid);
	if (inode->i_gid == -1 ||
	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
		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;
		inc_nlink(inode);
		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 int udf_alloc_i_data(struct inode *inode, size_t size)
{
	UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL);

	if (!UDF_I_DATA(inode)) {
		printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) no free memory\n",
		       inode->i_ino);
		return -ENOMEM;
	}

	return 0;
}

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.
 */

int udf_write_inode(struct inode *inode, int sync)
{
	int ret;

	lock_kernel();
	ret = udf_update_inode(inode, sync);
	unlock_kernel();

	return ret;
}

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;
	kernel_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);
		brelse(bh);
		return err;
	}

	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
		fe->uid = cpu_to_le32(-1);
	else
		fe->uid = cpu_to_le32(inode->i_uid);

	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
		fe->gid = cpu_to_le32(-1);
	else
		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 = cpu_to_le32(12);
			dsea->attrSubtype = 1;
			dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
						       sizeof(regid));
			dsea->impUseLength = cpu_to_le32(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 = cpu_to_le16(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));