Files on Detached Mounts #2754
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Files on Detached Mounts #2754
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By "detached mount" we refer to a mount, unmounted with the MNT_DETACH flag. Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
"anonymous" mounts are those created via open_tree with OPEN_TREE_CLONE and get "umount" when the fd returned by open_tree is closed. Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
We will be using statmount to add support for files on "unmounted" mounts. "unmounted" mounts refer to a mount that has been unmounted using umount2(mnt, MNT_DETACH) but we still have access to files on that mount. Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
For supporting files on "unmounted" mounts (mounts umounted with MNT_DETACH), we need support for statmount on fds. Add kerndat check to check support for statmount on fd. Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
Detached mounts are mounts which are unmounted using the MNT_DETACH flag. This commit adds support for files opened on detached mounts which are a bind mount of a existing mount (which is not detached) Signed-off-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
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This PR adds initial support for files on detached bind mounts.
Detached mounts are mounts which are unmounted using the
MNT_DETACHflag. This commit adds support for files opened on detached mounts which are a bind mount of a existing mount (which is not detached).This PR requires the kernel patches in this github branch to be applied:
https://github.com/bsach64/linux/tree/umount-mnt-ns-plus-statxhttps://github.com/bsach64/linux/tree/statmount-fd-v2https://github.com/bsach64/linux/tree/statmount-fd-v3https://github.com/bsach64/linux/tree/statmount-fd-v4https://github.com/bsach64/linux/tree/statmount-fd-v5
This PR is pretty draft, we are still to support a lot of things. This work is part of Google Summer of Code 2025.