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rpodgorny / unionfs-fuse

union filesystem using fuse
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fuse: unknown option(s): `-o use_ino,nonempty' #141

Open multiple1 opened 4 months ago

multiple1 commented 4 months ago

Hello! I am using the same mount options as in the example: https://github.com/rpodgorny/unionfs-fuse/blob/master/examples/S01a-unionfs-live-cd.sh#L6C42-L6C43

But I get this error using libfuse3.16.2:

fuse: unknown option(s): `-o use_ino,nonempty'

It seems that libfuse does no longer allow the use_ino mount option, because it should be set by the filesystem and not by the user. https://github.com/libfuse/libfuse/commit/8ee553dac0297cfd75cbdd2d9cfdce37e22ef4ee

So am I safe to simply remove use_ino and unionfs-fuse handles this correctly? I could not find use_ino in the unionfs source code, so I am not sure!

bsbernd commented 1 month ago

Sorry for late reply, I'm super busy. use_ino basically enables using the inode number provided by struct stat, instead of using a fuse internal consecutive counter. I think I had added that option to the examples/man-page as it helps to verify the right branch is used for a file. In the end neither fuse-internal inode number nor underlying file system inode (use_ino) are correct, as the inode number should be conserved during copy-on-write. And inode numbers also should be unique across different branches - for that the fuse internal inode number is even a little better.

rpodgorny commented 2 weeks ago

yeah, i've removed mentions of "use_ino" from examples and documentation. will be in next release.