Query Size on disk

[jtomori]

Hello,
first, thank you for sharing and maintaining p4vfs, it's very cool.

I'd like to ask if there's a way to programmatically query the Size on disk that I can see in the folder properties window. I'd like to know how much space a given p4vfs-managed directory takes on a disk.

I've tried various approaches, but without success. Mentioning some below:

• CMD's dir command reports only the full size
• Git BASH's du command reports the full size and hydrates files in the process
• Sysinternals' du command reports both Size and Size on disk, but the latter is incorrect (there's a non-zero value)
• Python's os.stat(file_path).st_size returns the full size

Best,
Juraj

[jessk-msft]

Hi Juraj,
That's a great question. A few suggestions:

1. With Windows 11, you can use C:\Windows\System32\diskusage.exe. It will show the correct disk usage of NTFS $DATA streams similar to what Windows Explorer is showing. Graphical tools like WinDirStat is similar. It does require elevated permission though.

2. The P4VFS source code contains three C++ functions which you may find interesting for calculating this info per-file. FileInfo::FileSize, FileInfo::FileUncompressedSize, FileInfo::FileDiskSize. They are used extensively in the P4VFS unit testing.

Regards
-Jess