feat: add "persist" feature #149
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loheagn
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Here's a an example dragonflyoss/nydus#1434 which shows how to use this feature. |
Cargo.toml
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| @@ -20,10 +20,11 @@ build = "build.rs" | |||
| arc-swap = "1.5" | |||
| async-trait = { version = "0.1.42", optional = true } | |||
| bitflags = "1.1" | |||
| snapshot = { git = "https://github.com/firecracker-microvm/firecracker", tag = "v1.4.1", optional = true } | |||
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We need a published crate here, otherwise we can't publish fuse-backend-rs anymore.
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Is there a published version of snapshot?
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@bergwolf no, I cannnot find the crate on crates.io .
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hmm, I've created firecracker-microvm/firecracker#4162. Let's see what the firecracker maintainers think.
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Now that we have https://crates.io/crates/dbs-snapshot, could you use the published one?
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Yes. I'll update it later.
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Yes. I'll update it later.
done.
This patch add a new sub module `persist` for the `fuse_backend_rs::api::vfs` module. The `persist` module export two functions to help to save and restore the `Vfs` state: - `save_to_bytes`, which save the mete data of the `Vfs` struct into a byte array; - `restore_from_bytes`, which restore the meta data of the `Vfs` struct from a byte array. As the two above functions only save and restore the vfs meta data, but don't save and restore the backend file systems, this patch also provides a method named `restore_mount` to re-mount the backend file system into the `Vfs` using the same index as before. For more information and usage, please refer to the doc of the `save_to_bytes` and `restore_from_bytes` functions. Signed-off-by: Nan Li <[email protected]>
This patch add a new sub module
persistfor thefuse_backend_rs::api::vfsmodule.The
persistmodule export two functions to help to save and restore theVfsstate:save_to_bytes, which save the mete data of theVfsstruct into a byte array;restore_from_bytes, which restore the meta data of theVfsstruct from a byte array.As the two above functions only save and restore the vfs meta data, but don't save and restore the backend file systems,
this patch also provides a method named
restore_mountto re-mount the backend file system into theVfsusing the same index as before.For more information and usage, please refer to the doc of the
save_to_bytesandrestore_from_bytesfunctions.