On Wed, Sep 25, 2019, at 10:56 AM, Chris Mason wrote:

The data is verified while being decompressed, but that's a fairly large 
fuzzing surface (all of zstd, zlib, and lzo).  A lot of people will 
correctly argue that we already have that fuzzing surface today, but I'd 
rather not make a really easy way to stuff arbitrary bytes through the 
kernel decompression code until all the projects involved sign off.

Right.  So maybe have this start of as a BTRFS ioctl and require
privileges?   I assume that's sufficient for what Omar wants.

(Are there actually any other popular Linux filesystems that do transparent compression anyways?)