Files are created even if the download has not started

Open stalkerok opened this issue 3 months ago • 1 comments

https://github.com/qbittorrent/qBittorrent/issues/21847

qBittorrent & operating system versions

qBittorrent v5.0.1 (64-bit) Qt: 6.7.3 Libtorrent: 1.2.19.0 Boost: 1.86.0 OpenSSL: 3.4.0 zlib: 1.3.1 OS: W10

What is the problem?

Files are created even if the download has not started.

https://github.com/user-attachments/assets/563a4417-525e-4ce2-afe1-37d3ecab4306

https://github.com/user-attachments/assets/3ade2e1b-1238-40ec-8781-6360d5752b12

Steps to reproduce

Start qBittorrent. Add a torrent in a stopped state. Go to the content tab and select/unselect items. Files are created with a size of 0 bytes. This is exacerbated if file preallocation is enabled. MOTW is disabled.

Sep 02 '25 13:09 stalkerok

I'll duplicate here:

When you change priority from "do not download" to something else, libtorrent tries to move existing data from .parts file to the actual file. But it does not know in advance if there is any data, so creates/allocates the file anyway.

https://github.com/arvidn/libtorrent/blob/1b5ab9f0080050eb99f5a8a0af48087ad98c33c6/src/mmap_storage.cpp#L176-L179

Sep 02 '25 13:09 HanabishiRecca