43  * Read the metadata block length, this is stored in the first two
47 			u64 *cur_index, int *offset, int *length)  in get_block_length()  argument
57 		*length = (unsigned char) bh->b_data[*offset];  in get_block_length()
62 		*length |= (unsigned char) bh->b_data[0] << 8;  in get_block_length()
65 		*length = (unsigned char) bh->b_data[*offset] |  in get_block_length()
83  * Read and decompress a metadata block or datablock.  Length is non-zero
85  * filesystem), otherwise the length is obtained from the first two bytes of
86  * the metadata block.  A bit in the length field indicates if the block
91 int squashfs_read_data(struct super_block *sb, u64 index, int length,  in squashfs_read_data()  argument
100 	bh = kcalloc(((output->length + msblk->devblksize - 1)  in squashfs_read_data()
105 	if (length) {  in squashfs_read_data()
110 		compressed = SQUASHFS_COMPRESSED_BLOCK(length);  in squashfs_read_data()
111 		length = SQUASHFS_COMPRESSED_SIZE_BLOCK(length);  in squashfs_read_data()
113 			*next_index = index + length;  in squashfs_read_data()
116 			index, compressed ? "" : "un", length, output->length);  in squashfs_read_data()
118 		if (length < 0 || length > output->length ||  in squashfs_read_data()
119 				(index + length) > msblk->bytes_used)  in squashfs_read_data()
122 		for (b = 0; bytes < length; b++, cur_index++) {  in squashfs_read_data()
136 		bh[0] = get_block_length(sb, &cur_index, &offset, &length);  in squashfs_read_data()
142 		compressed = SQUASHFS_COMPRESSED(length);  in squashfs_read_data()
143 		length = SQUASHFS_COMPRESSED_SIZE(length);  in squashfs_read_data()
145 			*next_index = index + length + 2;  in squashfs_read_data()
148 				compressed ? "" : "un", length);  in squashfs_read_data()
150 		if (length < 0 || length > output->length ||  in squashfs_read_data()
151 					(index + length) > msblk->bytes_used)  in squashfs_read_data()
154 		for (; bytes < length; b++) {  in squashfs_read_data()
172 		length = squashfs_decompress(msblk, bh, b, offset, length,  in squashfs_read_data()
174 		if (length < 0)  in squashfs_read_data()
183 		for (bytes = length; k < b; k++) {  in squashfs_read_data()
206 	return length;  in squashfs_read_data()