PRead is implemented by read from the underlying file in blocks, and
verify each block. The verified contents are saved into the output
buffer.
PiperOrigin-RevId: 332092267
Implement walk directories in gvisor verity file system. For each step,
the child dentry is verified against a verified parent root hash.
PiperOrigin-RevId: 329358747
If the data is in the same Reader as the merkle tree, we should verify
from the first layer in the tree, instead of from the beginning.
PiperOrigin-RevId: 328230988