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Please consider pulling these changes from the signed vfs-7.4-rc1.mount tag. Thanks! Christian -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCatHrlwAKCRCRxhvAZXjc okTnAP42ymJnRxXT0sSaNQ8Sk9PIRQ+1evElkdr0LfGkBp5ApAEAjtRL+o4LCjd9 WRE1+n+xwuQyPHUv9UghlPi8Qnr7ggU= =nfhQ -----END PGP SIGNATURE----- Merge tag 'vfs-7.4-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull mount updates from Christian Brauner: "This adds OPEN_TREE_DROP_MNTNS_MOUNTS. crun started using OPEN_TREE_NAMESPACE to set up the container's mount namespace and open_tree(OPEN_TREE_CLONE) for the sources of its bind mounts. That fails on any host with a mount namespace pinned below such a source. The recursive clone picks the pinned namespace up and move_mount() refuses to attach the tree with ELOOP. Only a younger mount namespace may ever be bound into an older one or mount namespace references could form a loop. A namespace created with OPEN_TREE_NAMESPACE is younger than everything else on the system so from inside it every pinned namespace is older. By the time this fails setns() has run and the host tree is out of reach, so the runtime has to predict the situation beforehand and lose the optimization. snapd pins mount namespaces under /run/snapd/ns so on Ubuntu that is any container bind mounting the host root. Every other path crossing a mount namespace boundary already leaves these mounts behind, copy_mnt_ns() and create_new_namespace() both do. Only get_detached_copy() asks for them. The new flag lets a caller get a clone without them. It stays opt-in because open_tree(OPEN_TREE_CLONE) plus move_mount() is mount --rbind through a file descriptor and dropping them by default would silently lose /run/snapd/ns/*.mnt on a live system. It requires AT_RECURSIVE, is a no-op with OPEN_TREE_NAMESPACE and skips locked nsfs mounts the way copy_mnt_ns() does, so nothing new is exposed. Selftests are included" * tag 'vfs-7.4-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: selftests/filesystems: test OPEN_TREE_DROP_MNTNS_MOUNTS mount: add OPEN_TREE_DROP_MNTNS_MOUNTS |
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