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The libfuse github has some good examples for C/C++ in [0] of increasing complexity: - passthrough.c mirrors existing filesystem, "Its performance is terrible.

The libfuse github has some good examples for C/C++ in [0] of increasing complexity: - passthrough.c mirrors existing filesystem, "Its performance is terrible." - passthrough_fh.c "performance is not quite as bad." - passthrough_ll.c implemented with low level api and "the least bad among the three" - passthrough_hp.cc high performance version written in C++ Some interesting fuse projects in my notes: [1] splitting large files into segments; [2] show ZFS incremental snapshots as files; [3] transparent filesystem compression; [4] and [5] options for mounting archives as filesytems. - [0] https://github.com/libfuse/libfuse/tree/master/example https://github.com/libfuse/libfuse/tree/master/example - [1] https://github.com/seiferma/splitviewfuse https://github.com/seiferma/splitviewfuse - [2] https://github.com/UNFmontreal/zfs_fuse_snapshot https://github.com/UNFmontreal/zfs_fuse_snapshot - [3] https://github.com/FS-make-simple/fusecompress https://github.com/FS-make-simple/fusecompress - [4] https://github.com/google/fuse-archive https://github.com/google/fuse-archive - [5] https://github.com/mxmlnkn/ratarmount https://github.com/mxmlnkn/ratarmount

craftkiller 2y ago
While [2] might be a good code example, this functionality is already built into ZFS. At the mountpoint of every dataset is a hidden ".zfs" folder that doesn't show up, even on a `ls -A`. You just have to believe its there and cd into it. Under that is a "snapshot" folder, and inside that is a folder for each snapshot of that dataset. Those folders contain the files in the snapshot. So for example, /etc/hosts from my snapshot zrepl_20241011_010143_000 would be at /.zfs/snapshot/zrepl_20241011_010143_000/etc/hosts If you don't like the magic hidden nature of it, you can even configure it to behave like a normal folder with `zfs set snapdir=visible <dataset>`
- dsp_person 2y ago
  What [2] is doing is exposing the raw send stream as a file, not what the contents of the hidden .zfs folder contains. https://github.com/UNFmontreal/zfs_fuse_snapshot/blob/64b17be54601a775be17c99fcfe20fcac91a6567/zfs_fuse_snapshot.py#L65 https://github.com/UNFmontreal/zfs_fuse_snapshot/blob/64b17b...
  - hnlmorg 2y ago
    The GP wasn’t suggesting [2] was using the ZFS snapshot folder. It was saying that ZFS natively supports a file system via of snapshots so people should be mindful to use [2] as an example of writing FUSE file systems rather than a practical tool for working with ZFS.
j45 2y ago
I was just thinking about Fuse the other day for a project to get around case sensitivity in linux for a use case. Appreciate these links. I'm a little rusty on it, if anyone has any Fuse tutorials or guides they found helpful, happy to receive.
- giis 2y ago
  If you have recent kernel version and using ext4, case insensitivity for specific directory can be enabled using casefold feature. See https://unix.stackexchange.com/questions/558977/how-to-enable-new-in-kernel-5-2-case-insensitivity-for-ext4-on-a-given-directory https://unix.stackexchange.com/questions/558977/how-to-enabl...
  - j45 2y ago
    Nice, thank so much.
- RunningDroid 2y ago
  > I was just thinking about Fuse the other day for a project to get around case sensitivity in linux for a use case. You should give ciopfs* a shot, it's worked well enough for my use case (playing games indirectly based on nwjs) *https://www.brain-dump.org/projects/ciopfs/ https://www.brain-dump.org/projects/ciopfs/

craftkiller 2y ago

While [2] might be a good code example, this functionality is already built into ZFS. At the mountpoint of every dataset is a hidden ".zfs" folder that doesn't show up, even on a `ls -A`. You just have to believe its there and cd into it. Under that is a "snapshot" folder, and inside that is a folder for each snapshot of that dataset. Those folders contain the files in the snapshot. So for example, /etc/hosts from my snapshot zrepl_20241011_010143_000 would be at /.zfs/snapshot/zrepl_20241011_010143_000/etc/hosts If you don't like the magic hidden nature of it, you can even configure it to behave like a normal folder with `zfs set snapdir=visible <dataset>`

dsp_person 2y ago
What [2] is doing is exposing the raw send stream as a file, not what the contents of the hidden .zfs folder contains. https://github.com/UNFmontreal/zfs_fuse_snapshot/blob/64b17be54601a775be17c99fcfe20fcac91a6567/zfs_fuse_snapshot.py#L65 https://github.com/UNFmontreal/zfs_fuse_snapshot/blob/64b17b...
- hnlmorg 2y ago
  The GP wasn’t suggesting [2] was using the ZFS snapshot folder. It was saying that ZFS natively supports a file system via of snapshots so people should be mindful to use [2] as an example of writing FUSE file systems rather than a practical tool for working with ZFS.

j45 2y ago

I was just thinking about Fuse the other day for a project to get around case sensitivity in linux for a use case. Appreciate these links. I'm a little rusty on it, if anyone has any Fuse tutorials or guides they found helpful, happy to receive.

giis 2y ago
If you have recent kernel version and using ext4, case insensitivity for specific directory can be enabled using casefold feature. See https://unix.stackexchange.com/questions/558977/how-to-enable-new-in-kernel-5-2-case-insensitivity-for-ext4-on-a-given-directory https://unix.stackexchange.com/questions/558977/how-to-enabl...
- j45 2y ago
  Nice, thank so much.
RunningDroid 2y ago
> I was just thinking about Fuse the other day for a project to get around case sensitivity in linux for a use case. You should give ciopfs* a shot, it's worked well enough for my use case (playing games indirectly based on nwjs) *https://www.brain-dump.org/projects/ciopfs/ https://www.brain-dump.org/projects/ciopfs/