mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 10:42:47 +01:00
96 lines
4.3 KiB
C++
96 lines
4.3 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_FS_WRITE_H
|
|
|
|
namespace ircd::fs
|
|
{
|
|
struct write_opts extern const write_opts_default;
|
|
|
|
// Yields ircd::ctx for write from buffers; returns bytes written
|
|
size_t write(const fd &, const const_buffers &, const write_opts & = write_opts_default);
|
|
size_t write(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
|
|
|
|
// Yields ircd::ctx for write from buffer; returns view of written portion
|
|
const_buffer write(const fd &, const const_buffer &, const write_opts & = write_opts_default);
|
|
const_buffer write(const string_view &path, const const_buffer &, const write_opts & = write_opts_default);
|
|
|
|
// Yields ircd::ctx to append to file from buffers; returns bytes appended
|
|
size_t append(const fd &, const const_buffers &, const write_opts & = write_opts_default);
|
|
size_t append(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
|
|
|
|
// Yields ircd::ctx to append to file from buffer; returns view of written portion
|
|
const_buffer append(const fd &, const const_buffer &, const write_opts & = write_opts_default);
|
|
const_buffer append(const string_view &path, const const_buffer &, const write_opts & = write_opts_default);
|
|
|
|
// Yields ircd::ctx to overwrite (trunc) file from buffers; returns bytes written
|
|
size_t overwrite(const fd &, const const_buffers &, const write_opts & = write_opts_default);
|
|
size_t overwrite(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
|
|
|
|
// Yields ircd::ctx to overwrite (trunc) file from buffer; returns view of written portion
|
|
const_buffer overwrite(const fd &, const const_buffer & = {}, const write_opts & = write_opts_default);
|
|
const_buffer overwrite(const string_view &path, const const_buffer & = {}, const write_opts & = write_opts_default);
|
|
|
|
// Truncate file to explicit size
|
|
void truncate(const fd &, const size_t &, const write_opts & = write_opts_default);
|
|
void truncate(const string_view &path, const size_t &, const write_opts & = write_opts_default);
|
|
|
|
// Allocate
|
|
void allocate(const fd &, const size_t &size, const write_opts & = write_opts_default);
|
|
}
|
|
|
|
/// Options for a write operation
|
|
struct ircd::fs::write_opts
|
|
{
|
|
write_opts() = default;
|
|
write_opts(const off_t &);
|
|
|
|
/// Offset in the file to start the write from. For append() if this zero
|
|
/// then it will be internally set to the end of the file; otherwise if
|
|
/// this is set it will write to that offset, even for append(), unless
|
|
/// the host system later ignores the offset due to the file's openmode.
|
|
off_t offset {0};
|
|
|
|
/// Request priority. Lower value request will take priority over higher.
|
|
int8_t priority {0};
|
|
|
|
/// for allocate()
|
|
bool keep_size {false};
|
|
|
|
/// Determines whether this operation is conducted via AIO. If not, a
|
|
/// direct syscall is made. Using AIO will only block one ircd::ctx while
|
|
/// a direct syscall will block the thread (all contexts). If AIO is not
|
|
/// available or not enabled, or doesn't support this operation, setting
|
|
/// this has no effect.
|
|
bool aio {true};
|
|
|
|
/// Yields the ircd::ctx until the buffers are written. This performs
|
|
/// the unix incremental write loop internally. When this option is true,
|
|
/// any return value from a function in the write() suite will not be a
|
|
/// partial value requiring another invocation of write().
|
|
bool all {true};
|
|
|
|
/// Whether to propagate an EINTR; otherwise we reinvoke the syscall. For a
|
|
/// write(2) family call this can only happen before any data was written;
|
|
/// an exception will be thrown. We default to true because we have faith
|
|
/// in the useful propagation of an exception for this event.
|
|
bool interruptible {true};
|
|
|
|
/// Submits the I/O request immediately rather than allowing IRCd to
|
|
/// queue requests for a few iterations of the ircd::ios event loop.
|
|
/// (only relevant to aio).
|
|
bool nodelay {false};
|
|
};
|
|
|
|
inline
|
|
ircd::fs::write_opts::write_opts(const off_t &offset)
|
|
:offset{offset}
|
|
{}
|