drivers/md/dm-verity-target.c

55 	sector_t block;
61  * hash_verified is nonzero, hash of the block has been verified.
94  * Return hash position of a specified block at a specified tree level
97  * inside a hash block. The remaining bits denote location of the hash block.
99 static sector_t verity_position_at_level(struct dm_verity *v, sector_t block,
102 	return block >> (level * v->hash_per_block_bits);
203 static void verity_hash_at_level(struct dm_verity *v, sector_t block, int level,
206 	sector_t position = verity_position_at_level(v, block, level);
225 			     unsigned long long block)
251 	DMERR_LIMIT("%s: %s block %llu is corrupted", v->data_dev->name,
252 		    type_str, block);
260 		DM_VERITY_ENV_VAR_NAME, type, block);
278  * Verify hash of a metadata block pertaining to the specified data block
279  * ("block" argument) at a specified level ("level" argument).
282  * for a lower tree level or for the data block (if we're at the lowest level).
289 			       sector_t block, int level, bool skip_unverified,
300 	verity_hash_at_level(v, block, level, &hash_block, &offset);
354 					 block, 0);
370  * Find a hash for a given block, write it to digest and verify the integrity
374 			  sector_t block, u8 *digest, bool *is_zero)
381 		 * the current block. If the hash block itself is
386 		r = verity_verify_level(v, io, block, 0, true, digest);
394 		r = verity_verify_level(v, io, block, i, false, digest);
431 		 * until you consider the typical block size is 4,096B.
553  * Moves the bio iter one data block forward.
590 		sector_t cur_block = io->block + b;
607 			 * If we expect a zero block, don't validate, just
760 		verity_hash_at_level(v, pw->block, i, &hash_block_start, NULL);
761 		verity_hash_at_level(v, pw->block + pw->n_blocks - 1, i, &hash_block_end, NULL);
790 	sector_t block = io->block;
795 		while (n_blocks && test_bit(block, v->validated_blocks)) {
796 			block++;
799 		while (n_blocks && test_bit(block + n_blocks - 1,
814 	pw->block = block;
850 	io->block = bio->bi_iter.bi_sector >> (v->data_dev_block_bits - SECTOR_SHIFT);
1235  *	<data block size>
1236  *	<hash block size>
1238  *	<hash start block>
1313 		ti->error = "Invalid data device block size";
1323 		ti->error = "Invalid hash device block size";