public PosixJournalWriter(StorageEnvironmentOptions options, string filename, long journalSize)
{
_options = options;
_filename = filename;
_maxNumberOfPagesPerSingleWrite = int.MaxValue / _options.PageSize;
_fd = Syscall.open(filename, OpenFlags.O_WRONLY | options.PosixOpenFlags | OpenFlags.O_CREAT,
FilePermissions.S_IWUSR | FilePermissions.S_IRUSR);
if (_fd == -1)
{
var err = Marshal.GetLastWin32Error();
PosixHelper.ThrowLastError(err, "when opening " + filename);
}
int result;
if ((options.SafePosixOpenFlags & PerPlatformValues.OpenFlags.O_DIRECT) == 0)
{
// fallocate doesn't supported, we'll use lseek instead
result = Syscall.AllocateUsingLseek(_fd, journalSize);
}
else
{
result = Syscall.posix_fallocate(_fd, IntPtr.Zero, (UIntPtr)journalSize);
}
if (result != 0)
{
PosixHelper.ThrowLastError(result, "when allocating " + filename);
}
if (PosixHelper.CheckSyncDirectoryAllowed(_filename) && PosixHelper.SyncDirectory(filename) == -1)
{
var err = Marshal.GetLastWin32Error();
PosixHelper.ThrowLastError(err, "when syncing dir for on " + filename);
}
NumberOfAllocatedPages = (int)(journalSize / _options.PageSize);
}