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[thin_shrink] add some more test cases

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This commit is contained in:
Joe Thornber 2020-06-30 08:32:04 +01:00
parent 3618da3a12
commit 4d7f9c7ddc
2 changed files with 161 additions and 67 deletions
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3
src/shrink/copier.rs
View File

@ -20,7 +20,7 @@ where
{
let mut buf = vec![0; len];
file.seek(SeekFrom::Start(src_byte))?;
file.read_exact(&mut buf[0..])?;
file.read_exact(&mut buf)?;
file.seek(SeekFrom::Start(dest_byte))?;
file.write_all(&buf)?;
Ok(())
@ -55,6 +55,7 @@ pub fn copy(path: &Path, regions: &[Region]) -> Result<()> {
eprintln!("copying {:?}", r);
copy_region(&mut input, r)?;
}
input.flush()?;
Ok(())
}

223
tests/thin_shrink.rs
View File

@ -1,4 +1,4 @@
use anyhow::Result;
use anyhow::{anyhow, Result};
use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
use rand::Rng;
use std::fs::OpenOptions;
@ -11,6 +11,7 @@ use thinp::thin::xml::{self, Visit};
//------------------------------------
#[derive(Debug)]
struct ThinBlock {
thin_id: u32,
thin_block: u64,
@ -33,35 +34,36 @@ impl ThinBlock {
let mut rr = ThinReadRef {
data: vec![0; self.block_size],
};
r.seek(SeekFrom::Start(self.data_block * (self.block_size as u64)))?;
r.read_exact(&mut rr.data[0..])?;
let byte = self.data_block * (self.block_size as u64) * 512;
r.seek(SeekFrom::Start(byte))?;
r.read_exact(&mut rr.data)?;
Ok(rr)
}
fn zero_ref<'a, W: Write + Seek>(&self, w: &'a mut W) -> ThinWriteRef<'a, W> {
ThinWriteRef {
file: w,
block_byte: self.data_block * (self.block_size as u64),
block_byte: self.data_block * (self.block_size as u64) * 512,
data: vec![0; self.block_size],
}
}
fn write_ref<'a, W>(&self, w: &'a mut W) -> Result<ThinWriteRef<'a, W>>
where
W: Read + Write + Seek,
{
let mut data = vec![0; self.block_size];
w.seek(SeekFrom::Start(self.data_block * (self.block_size as u64)))?;
w.read_exact(&mut data[0..])?;
let wr = ThinWriteRef {
file: w,
block_byte: self.data_block * (self.block_size as u64),
data: vec![0; self.block_size],
};
Ok(wr)
}
//fn write_ref<'a, W>(&self, w: &'a mut W) -> Result<ThinWriteRef<'a, W>>
//where
//W: Read + Write + Seek,
//{
//let mut data = vec![0; self.block_size];
//w.seek(SeekFrom::Start(self.data_block * (self.block_size as u64)))?;
//w.read_exact(&mut data[0..])?;
//
//let wr = ThinWriteRef {
//file: w,
//block_byte: self.data_block * (self.block_size as u64),
//data: vec![0; self.block_size],
//};
//
//Ok(wr)
//}
}
impl<'a, W: Write + Seek> Drop for ThinWriteRef<'a, W> {
@ -70,7 +72,7 @@ impl<'a, W: Write + Seek> Drop for ThinWriteRef<'a, W> {
// errors will have to make their way back to the user
// another way (eg, via a flush() method).
self.file.seek(SeekFrom::Start(self.block_byte)).unwrap();
self.file.write_all(&self.data[0..]).unwrap();
self.file.write_all(&self.data).unwrap();
}
}
@ -161,34 +163,41 @@ impl Generator {
}
fn step(&mut self) {
self.x = (self.a * self.x) + self.c
self.x = self.a.wrapping_mul(self.x).wrapping_add(self.c)
}
fn fill_buffer(&mut self, seed: u64, bytes: &mut [u8]) {
fn fill_buffer(&mut self, seed: u64, bytes: &mut [u8]) -> Result<()> {
self.x = seed;
assert!(bytes.len() % 8 == 64);
assert!(bytes.len() % 8 == 0);
let nr_words = bytes.len() / 8;
let mut out = Cursor::new(bytes);
for _ in 0..nr_words {
out.write_u64::<LittleEndian>(self.x).unwrap();
out.write_u64::<LittleEndian>(self.x)?;
self.step();
}
Ok(())
}
fn verify_buffer(&mut self, seed: u64, bytes: &[u8]) {
fn verify_buffer(&mut self, seed: u64, bytes: &[u8]) -> Result<bool> {
self.x = seed;
assert!(bytes.len() % 8 == 64);
assert!(bytes.len() % 8 == 0);
let nr_words = bytes.len() / 8;
let mut input = Cursor::new(bytes);
for _ in 0..nr_words {
let w = input.read_u64::<LittleEndian>().unwrap();
assert_eq!(w, self.x);
let w = input.read_u64::<LittleEndian>()?;
if w != self.x {
eprintln!("{} != {}", w, self.x);
return Ok(false);
}
self.step();
}
Ok(true)
}
}
@ -212,7 +221,7 @@ impl<'a, W: Write + Seek> ThinVisitor for Stamper<'a, W> {
gen.fill_buffer(
self.seed ^ (b.thin_id as u64) ^ b.thin_block,
&mut wr.data[0..],
);
)?;
Ok(())
}
}
@ -234,7 +243,9 @@ impl<'a, R: Read + Seek> ThinVisitor for Verifier<'a, R> {
fn thin_block(&mut self, b: &ThinBlock) -> Result<()> {
let rr = b.read_ref(self.data_file)?;
let mut gen = Generator::new();
gen.verify_buffer(self.seed ^ (b.thin_id as u64) ^ b.thin_block, &rr.data[0..]);
if !gen.verify_buffer(self.seed ^ (b.thin_id as u64) ^ b.thin_block, &rr.data[0..])? {
return Err(anyhow!("data verify failed for {:?}", b));
}
Ok(())
}
}
@ -248,10 +259,7 @@ fn mk_path(dir: &Path, file: &str) -> PathBuf {
p
}
fn generate_xml<G>(path: &Path, g: &mut G) -> Result<()>
where
G: XmlGenerator,
{
fn generate_xml(path: &Path, g: &mut dyn Scenario) -> Result<()> {
let xml_out = OpenOptions::new()
.read(false)
.write(true)
@ -260,7 +268,7 @@ where
.open(path)?;
let mut w = xml::XmlWriter::new(xml_out);
g.generate(&mut w)
g.generate_xml(&mut w)
}
fn create_data_file(data_path: &Path, xml_path: &Path) -> Result<()> {
@ -296,40 +304,18 @@ fn verify(xml_path: &Path, data_path: &Path, seed: u64) -> Result<()> {
thin_visit(xml, &mut verifier)
}
//------------------------------------
trait XmlGenerator {
fn generate(&mut self, v: &mut dyn xml::MetadataVisitor) -> Result<()>;
trait Scenario {
fn generate_xml(&mut self, v: &mut dyn xml::MetadataVisitor) -> Result<()>;
fn get_new_nr_blocks(&self) -> u64;
}
struct EmptyPoolG {}
impl XmlGenerator for EmptyPoolG {
fn generate(&mut self, v: &mut dyn xml::MetadataVisitor) -> Result<()> {
v.superblock_b(&xml::Superblock {
uuid: "".to_string(),
time: 0,
transaction: 0,
flags: None,
version: None,
data_block_size: 64,
nr_data_blocks: 1024,
metadata_snap: None,
})?;
v.superblock_e()?;
Ok(())
}
}
#[test]
fn shrink_empty_pool() -> Result<()> {
fn test_shrink(scenario: &mut dyn Scenario) -> Result<()> {
let dir = tempdir()?;
let xml_before = mk_path(dir.path(), "before.xml");
let xml_after = mk_path(dir.path(), "after.xml");
let data_path = mk_path(dir.path(), "bin");
let data_path = mk_path(dir.path(), "metadata.bin");
let mut gen = EmptyPoolG {};
generate_xml(&xml_before, &mut gen)?;
generate_xml(&xml_before, scenario)?;
create_data_file(&data_path, &xml_before)?;
let mut rng = rand::thread_rng();
@ -337,9 +323,116 @@ fn shrink_empty_pool() -> Result<()> {
stamp(&xml_before, &data_path, seed)?;
let new_nr_blocks = 10;
let new_nr_blocks = scenario.get_new_nr_blocks();
thinp::shrink::toplevel::shrink(&xml_before, &xml_after, &data_path, new_nr_blocks, true)?;
verify(&xml_after, &data_path, seed)?;
Ok(())
}
//------------------------------------
fn common_sb(nr_blocks: u64) -> xml::Superblock {
xml::Superblock {
uuid: "".to_string(),
time: 0,
transaction: 0,
flags: None,
version: None,
data_block_size: 32,
nr_data_blocks: nr_blocks,
metadata_snap: None,
}
}
struct EmptyPoolS {}
impl Scenario for EmptyPoolS {
fn generate_xml(&mut self, v: &mut dyn xml::MetadataVisitor) -> Result<()> {
v.superblock_b(&common_sb(1024))?;
v.superblock_e()?;
Ok(())
}
fn get_new_nr_blocks(&self) -> u64 {
512
}
}
#[test]
fn shrink_empty_pool() -> Result<()> {
let mut s = EmptyPoolS {};
test_shrink(&mut s)
}
//------------------------------------
struct SingleThinS {
offset: u64,
len: u64,
old_nr_data_blocks: u64,
new_nr_data_blocks: u64,
}
impl SingleThinS {
fn new(offset: u64, len: u64, old_nr_data_blocks: u64, new_nr_data_blocks: u64) -> Self {
SingleThinS {
offset,
len,
old_nr_data_blocks,
new_nr_data_blocks,
}
}
}
impl Scenario for SingleThinS {
fn generate_xml(&mut self, v: &mut dyn xml::MetadataVisitor) -> Result<()> {
v.superblock_b(&common_sb(self.old_nr_data_blocks))?;
v.device_b(&xml::Device {
dev_id: 0,
mapped_blocks: self.len,
transaction: 0,
creation_time: 0,
snap_time: 0,
})?;
v.map(&xml::Map {
thin_begin: 0,
data_begin: self.offset,
time: 0,
len: self.len,
})?;
v.device_e()?;
v.superblock_e()?;
Ok(())
}
fn get_new_nr_blocks(&self) -> u64 {
self.new_nr_data_blocks
}
}
#[test]
fn shrink_single_no_move_1() -> Result<()> {
let mut s = SingleThinS::new(0, 1024, 2048, 1280);
test_shrink(&mut s)
}
#[test]
fn shrink_single_no_move_2() -> Result<()> {
let mut s = SingleThinS::new(100, 1024, 2048, 1280);
test_shrink(&mut s)
}
#[test]
fn shrink_single_no_move_3() -> Result<()> {
let mut s = SingleThinS::new(1024, 1024, 2048, 2048);
test_shrink(&mut s)
}
#[test]
fn shrink_single_partial_move() -> Result<()> {
let mut s = SingleThinS::new(1024, 1024, 2048, 1280);
test_shrink(&mut s)
}
//------------------------------------