Struct ServerFeatures 

pub struct ServerFeatures(/* private fields */);

Features supported by an NBD server implementation.

Derived from transmission flags but excluding administrative flags like HAS_FLAGS and READ_ONLY. These flags allow the server to advertise which features it supports.

For each flag, the server:

• MAY set the flag for features it supports
• MUST NOT set the flag for features it does not support
• The client MUST NOT use a feature documented as ‘exposed’ by a flag unless that flag was set

Available flags:

• ServerFeatures::SEND_FLUSH (0x0004): Exposes support for NBD_CMD_FLUSH.
• ServerFeatures::SEND_FUA (0x0008): Exposes support for NBD_CMD_FLAG_FUA (Force Unit Access).
• ServerFeatures::ROTATIONAL (0x0010): Indicates the export has characteristics of a rotational medium. The client MAY schedule I/O accesses accordingly.
• ServerFeatures::SEND_TRIM (0x0020): Exposes support for NBD_CMD_TRIM.
• ServerFeatures::SEND_WRITE_ZEROES (0x0040): Exposes support for NBD_CMD_WRITE_ZEROES and NBD_CMD_FLAG_NO_HOLE.
• ServerFeatures::SEND_DF (0x0080): Do not fragment a structured reply. Indicates the server supports the NBD_CMD_FLAG_DF request flag.
• ServerFeatures::CAN_MULTI_CONN (0x0100): Indicates that the server operates without cache or with a shared cache, making FLUSH and FUA operations visible across all connections. Without this flag, clients SHOULD NOT multiplex commands over multiple connections.
• ServerFeatures::SEND_RESIZE (0x0200): Exposes support for the experimental RESIZE extension.
• ServerFeatures::SEND_CACHE (0x0400): Documents that the server understands NBD_CMD_CACHE. Note that some servers may support the command without this bit, and this flag doesn’t guarantee the command will succeed.
• ServerFeatures::SEND_FAST_ZERO (0x0800): Allows clients to detect if NBD_CMD_WRITE_ZEROES is faster than a corresponding write via the NBD_CMD_FLAG_FAST_ZERO request flag.
• ServerFeatures::BLOCK_STATUS_PAYLOAD (0x1000): Defined by the experimental EXTENDED_HEADERS extension.

Implementations

impl ServerFeatures

pub const SEND_FLUSH: Self

pub const SEND_FUA: Self

pub const ROTATIONAL: Self

pub const SEND_TRIM: Self

pub const SEND_WRITE_ZEROES: Self

pub const SEND_DF: Self

pub const CAN_MULTI_CONN: Self

pub const SEND_RESIZE: Self

pub const SEND_CACHE: Self

pub const SEND_FAST_ZERO: Self

pub const BLOCK_STATUS_PAYLOAD: Self

impl ServerFeatures

pub const fn empty() -> Self

Get a flags value with all bits unset.

pub const fn all() -> Self

Get a flags value with all known bits set.

pub const fn bits(&self) -> u16

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u16) -> Option<Self>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u16) -> Self

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u16) -> Self

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: Self) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: Self) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: Self, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl ServerFeatures

pub const fn iter(&self) -> Iter<ServerFeatures>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<ServerFeatures>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

Trait Implementations

impl Binary for ServerFeatures

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

Formats the value using the given formatter.

impl BitAnd for ServerFeatures

fn bitand(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

type Output = ServerFeatures

The resulting type after applying the & operator.

impl BitAndAssign for ServerFeatures

fn bitand_assign(&mut self, other: Self)

The bitwise and (&) of the bits in two flags values.

impl BitOr for ServerFeatures

fn bitor(self, other: ServerFeatures) -> Self

The bitwise or (|) of the bits in two flags values.

type Output = ServerFeatures

The resulting type after applying the | operator.

impl BitOrAssign for ServerFeatures

fn bitor_assign(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

impl BitXor for ServerFeatures

fn bitxor(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = ServerFeatures

The resulting type after applying the ^ operator.

impl BitXorAssign for ServerFeatures

fn bitxor_assign(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Debug for ServerFeatures

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

Formats the value using the given formatter.

impl Extend<ServerFeatures> for ServerFeatures

fn extend<T: IntoIterator<Item = Self>>(&mut self, iterator: T)

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl Flags for ServerFeatures

const FLAGS: &'static [Flag<ServerFeatures>]

The set of defined flags.

type Bits = u16

The underlying bits type.

fn bits(&self) -> u16

Get the underlying bits value.

fn from_bits_retain(bits: u16) -> ServerFeatures

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn contains_unknown_bits(&self) -> bool

This method will return true if any unknown bits are set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

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

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

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

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn truncate(&mut self)

where Self: Sized,

Remove any unknown bits from the flags.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

fn clear(&mut self)

where Self: Sized,

Unsets all bits in the flags.

fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromIterator<ServerFeatures> for ServerFeatures

fn from_iter<T: IntoIterator<Item = Self>>(iterator: T) -> Self

The bitwise or (|) of the bits in each flags value.

impl IntoIterator for ServerFeatures

type Item = ServerFeatures

The type of the elements being iterated over.

type IntoIter = Iter<ServerFeatures>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl LowerHex for ServerFeatures

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

Formats the value using the given formatter.

impl Not for ServerFeatures

fn not(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = ServerFeatures

The resulting type after applying the ! operator.

impl Octal for ServerFeatures

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

Formats the value using the given formatter.

impl PublicFlags for ServerFeatures

type Primitive = u16

The type of the underlying storage.

type Internal = InternalBitFlags

The type of the internal field on the generated flags type.

impl Sub for ServerFeatures

fn sub(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = ServerFeatures

The resulting type after applying the - operator.

impl SubAssign for ServerFeatures

fn sub_assign(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl UpperHex for ServerFeatures

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

Formats the value using the given formatter.