blob: 8b79ffe5c3158711c2c6c42796b28bd192bc701e (
plain)
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
40
41
42
43
44
45
46
|
//===- OnDiskCommon.h -------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CAS_ONDISKCOMMON_H
#define LLVM_LIB_CAS_ONDISKCOMMON_H
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include <chrono>
namespace llvm::cas::ondisk {
/// Thread-safe alternative to \c sys::fs::lockFile. This does not support all
/// the platforms that \c sys::fs::lockFile does, so keep it in the CAS library
/// for now.
std::error_code lockFileThreadSafe(int FD, llvm::sys::fs::LockKind Kind);
/// Thread-safe alternative to \c sys::fs::unlockFile. This does not support all
/// the platforms that \c sys::fs::lockFile does, so keep it in the CAS library
/// for now.
std::error_code unlockFileThreadSafe(int FD);
/// Thread-safe alternative to \c sys::fs::tryLockFile. This does not support
/// all the platforms that \c sys::fs::lockFile does, so keep it in the CAS
/// library for now.
std::error_code tryLockFileThreadSafe(
int FD, std::chrono::milliseconds Timeout = std::chrono::milliseconds(0),
llvm::sys::fs::LockKind Kind = llvm::sys::fs::LockKind::Exclusive);
/// Allocate space for the file \p FD on disk, if the filesystem supports it.
///
/// On filesystems that support this operation, this ensures errors such as
/// \c std::errc::no_space_on_device are detected before we write data.
///
/// \returns the new size of the file, or an \c Error.
Expected<size_t> preallocateFileTail(int FD, size_t CurrentSize,
size_t NewSize);
} // namespace llvm::cas::ondisk
#endif // LLVM_LIB_CAS_ONDISKCOMMON_H
|
