1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
// This file is part of linux-support. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/linux-support/master/COPYRIGHT. No part of linux-support, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2020 The developers of linux-support. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/linux-support/master/COPYRIGHT.
bitflags!
{
/// Flags to use with `pwritev2()` and io-uring.
pub struct WriteVectoredFlags: u32
{
/// High priority write.
///
/// Allows block-based filesystems to use polling of the device, which provides lower latency, but may use additional resources.
///
/// (Currently, this feature is usable only on a file descriptor opened using the `O_DIRECT` flag).
///
/// Since Linux 4.6.
const HighPriority = RWF_HIPRI;
/// Provide a per-write equivalent of the O_DSYNC open(2) flag.
///
/// Since Linux 4.7.
const SynchronizeDataOnly = RWF_DSYNC;
/// Provide a per-write equivalent of the O_SYNC open(2) flag.
///
/// Since Linux 4.7.
const SynchronizeDataAndMetadata = RWF_SYNC;
/// Provide a per-write equivalent of the O_APPEND open(2) flag.
///
/// Applies only to the data range written by the system call.
/// The `offset` argument does not affect the write operation; the data is always appended to the end of the file.
///
/// However, if the offset argument is `ReadOrWriteOffset::CurrentFilePosition`, the current file offset is updated.
///
/// Since Linux 4.16.
const Append = RWF_APPEND;
}
}