Struct PrimitiveError 

pub struct PrimitiveError {
    pub operation: &'static str,
    pub path: PathBuf,
    pub errno: i32,
}

What: One failed primitive call. &'static str is text compiled into the executable (sibling String is owned); i32 is the C errno value (siblings i64 and u32 exist; the C API returns a 32-bit signed integer). Why: The operation names the call as the kernel documents it (for example BTRFS_IOC_SNAP_CREATE_V2), so a report can be searched in the kernel sources.

In TS you’d write (pseudocode):

type PrimitiveError = { operation: string; path: string; errno: number };

Fields

operation: &'static str

The call that failed, spelled as its kernel or libc name.

path: PathBuf

The path the call was about.

errno: i32

The errno the call left, 0 when the failure is not an operating-system error (a path with a NUL byte).

Implementations

impl PrimitiveError

pub fn last_os_error(operation: &'static str, path: &Path) -> PrimitiveError

What: The error for the call that just failed, reading errno from the thread. Why: errno is overwritten by the next library call, so it is read before anything else runs.

In TS you’d write (pseudocode):

const fail = (operation: string, path: string) => new PrimitiveError(operation, path, lastErrno());

pub fn means_feature_missing(&self) -> bool

What: Whether the filesystem lacks the feature, as opposed to a fault in this call. Why: A ladder rung that gets true falls to the next rung; false is reported. Not a btrfs filesystem answers an ioctl with ENOTTY, a filesystem without reflinks answers FICLONE with EOPNOTSUPP or EINVAL, a clone across filesystems answers EXDEV, and an overlay over a layer without the feature answers ENOSYS.

In TS you’d write (pseudocode):

const lacksFeature = (e: PrimitiveError) => [ENOTTY, EOPNOTSUPP, EINVAL, EXDEV, ENOSYS].includes(e.errno);

Trait Implementations

impl Clone for PrimitiveError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PrimitiveError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PrimitiveError

Prints the call, the path and the system’s own words for the error number.

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for PrimitiveError

impl Error for PrimitiveError

A primitive error is an error value.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<PrimitiveError> for MigrateError

A primitive failure is a migration failure.

fn from(error: PrimitiveError) -> MigrateError

Converts to this type from the input type.

impl PartialEq for PrimitiveError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for PrimitiveError