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runtime-rs: add comments for runtime-rs shared directory

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add comments for runtime-rs shared directory

Fixes:#5197
Signed-off-by: Zhongtao Hu <zhongtaohu.tim@linux.alibaba.com>
This commit is contained in:
Zhongtao Hu 2022-09-20 14:26:08 +08:00
parent 2f1a4b02ee
commit 96cf21fad0
1 changed files with 10 additions and 3 deletions
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13
src/runtime-rs/crates/resource/src/share_fs/utils.rs
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@ -41,9 +41,16 @@ pub(crate) fn share_to_guest(
Ok(do_get_guest_path(target, cid, is_volume))
}
pub(crate) fn get_host_ro_shared_path(sid: &str) -> PathBuf {
Path::new(KATA_HOST_SHARED_DIR).join(sid).join("ro")
// Shared path handling:
// 1. create two directories for each sandbox:
// -. /run/kata-containers/shared/sandboxes/$sbx_id/rw/, a host/guest shared directory which is rw
// -. /run/kata-containers/shared/sandboxes/$sbx_id/ro/, a host/guest shared directory (virtiofs source dir) which is ro
//
// 2. /run/kata-containers/shared/sandboxes/$sbx_id/rw/ is bind mounted readonly to /run/kata-containers/shared/sandboxes/$sbx_id/ro/, so guest cannot modify it
//
// 3. host-guest shared files/directories are mounted one-level under /run/kata-containers/shared/sandboxes/$sbx_id/rw/passthrough and thus present to guest at one level under run/kata-containers/shared/containers/passthrough.
pub(crate) fn get_host_ro_shared_path(id: &str) -> PathBuf {
Path::new(KATA_HOST_SHARED_DIR).join(id).join("ro")
}
pub(crate) fn get_host_rw_shared_path(sid: &str) -> PathBuf {