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test(pool): create on very large or very slow disks
Uses LVM Lvols as backend devices for the pool. We suspend these before pool creation, allowing us to simulate slow pool creation. This test ensures that the pool creation is completed by itself and also that a client can also complete it by calling create again. Signed-off-by: Tiago Castro <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| //! LVM helper methods which are useful for setting up test block devices. | ||
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| use crate::TmpDiskFile; | ||
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| /// An LVM Logical Volume. | ||
| pub struct Lvol { | ||
| name: String, | ||
| path: String, | ||
| } | ||
| impl Lvol { | ||
| /// Get the host path for the lvol. | ||
| pub fn path(&self) -> &str { | ||
| &self.path | ||
| } | ||
| /// Suspends the device for IO. | ||
| pub fn suspend(&self) -> anyhow::Result<()> { | ||
| let _ = VolGroup::command(&["dmsetup", "suspend", self.path.as_str()])?; | ||
| Ok(()) | ||
| } | ||
| /// Resumes the device for IO. | ||
| pub fn resume(&self) -> anyhow::Result<()> { | ||
| let _ = VolGroup::command(&["dmsetup", "resume", self.path.as_str()])?; | ||
| Ok(()) | ||
| } | ||
| } | ||
| impl Drop for Lvol { | ||
| fn drop(&mut self) { | ||
| println!("Dropping Lvol {}", self.name); | ||
| self.resume().ok(); | ||
| } | ||
| } | ||
|
|
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| /// An LVM Volume Group. | ||
| pub struct VolGroup { | ||
| backing_file: TmpDiskFile, | ||
| dev_loop: String, | ||
| name: String, | ||
| } | ||
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| impl VolGroup { | ||
| /// Creates a new LVM Volume Group. | ||
| pub fn new(name: &str, size: u64) -> Result<Self, anyhow::Error> { | ||
| let backing_file = TmpDiskFile::new(name, size); | ||
|
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| let dev_loop = Self::command(&["losetup", "--show", "-f", backing_file.path()])?; | ||
| let dev_loop = dev_loop.trim_end().to_string(); | ||
| let _ = Self::command(&["pvcreate", dev_loop.as_str()])?; | ||
| let _ = Self::command(&["vgcreate", name, dev_loop.as_str()])?; | ||
|
|
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| Ok(Self { | ||
| backing_file, | ||
| dev_loop, | ||
| name: name.to_string(), | ||
| }) | ||
| } | ||
| /// Creates a new Lvol for the LVM Volume Group. | ||
| pub fn create_lvol(&self, name: &str, size: u64) -> Result<Lvol, anyhow::Error> { | ||
| let size = format!("{size}B"); | ||
|
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| let vg_name = self.name.as_str(); | ||
| let _ = Self::command(&["lvcreate", "-L", size.as_str(), "-n", name, vg_name])?; | ||
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| Ok(Lvol { | ||
| name: name.to_string(), | ||
| path: format!("/dev/{vg_name}/{name}"), | ||
| }) | ||
| } | ||
| /// Run a command with sudo, and the given args. | ||
| /// The output string is returned. | ||
| fn command(args: &[&str]) -> Result<String, anyhow::Error> { | ||
| let cmd = args.first().unwrap(); | ||
| let output = std::process::Command::new("sudo") | ||
| .arg("-E") | ||
| .args(args) | ||
| .output()?; | ||
| if !output.status.success() { | ||
| return Err(anyhow::anyhow!( | ||
| "{cmd} Exit Code: {}\nstdout: {}, stderr: {}", | ||
| output.status, | ||
| String::from_utf8(output.stdout).unwrap_or_default(), | ||
| String::from_utf8(output.stderr).unwrap_or_default() | ||
| )); | ||
| } | ||
| let output = String::from_utf8(output.stdout)?; | ||
| Ok(output) | ||
| } | ||
| } | ||
|
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||
| impl Drop for VolGroup { | ||
| fn drop(&mut self) { | ||
| println!( | ||
| "Dropping VolGroup {} <== {}", | ||
| self.name, | ||
| self.backing_file.path() | ||
| ); | ||
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| let _ = Self::command(&["vgremove", self.name.as_str(), "-y"]); | ||
| let _ = Self::command(&["losetup", "-d", self.dev_loop.as_str()]); | ||
| } | ||
| } |