On Tue, Jul 09, 2024 at 01:19:16PM +0200, Hanna Czenczek wrote: > Hi, > > We want to be able to mount filesystems that just consist of one regular > file via virtio-fs, i.e. no root directory, just a file as the root > node. > > While that is possible via FUSE itself (through the 'rootmode' mount > option, which is automatically set by the fusermount help program to > match the mount point's inode mode), there is no virtio-fs option yet > that would allow changing the rootmode from S_IFDIR to S_IFREG. > > To do that, this series introduces a new 'file' mount option that does > precisely that. Alternatively, we could provide the same 'rootmode' > option that FUSE has, but as laid out in patch 1's commit description, > that option is a bit cumbersome for virtio-fs (in a way that it is not > for FUSE), and its usefulness as a more general option is limited. >
All this does is make file an alias for something a little easier for users to read, which can easily be done in libfuse. Add the code to lib/mount.c to alias 'file' to turn it into rootmode=S_IFREG when it sends it to the kernel, it's not necessary to do this in the kernel. Thanks, Josef
