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fs: allow changing idmappings

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This patchset makes it possible to create a new idmapped mount from an
already idmapped mount and to clear idmappings.

// Create a first idmapped mount
struct mount_attr attr = {
        .attr_set = MOUNT_ATTR_IDMAP
        .userns_fd = fd_userns
};

fd_tree = open_tree(-EBADF, "/", OPEN_TREE_CLONE, &attr, sizeof(attr));
move_mount(fd_tree, "", -EBADF, "/mnt", MOVE_MOUNT_F_EMPTY_PATH);

// Create a second idmapped mount from the first idmapped mount
attr.attr_set = MOUNT_ATTR_IDMAP;
attr.userns_fd = fd_userns2;
fd_tree2 = open_tree(-EBADF, "/mnt", OPEN_TREE_CLONE, &attr, sizeof(attr));

// Create a second non-idmapped mount from the first idmapped mount:
memset(&attr, 0, sizeof(attr));
attr.attr_clr = MOUNT_ATTR_IDMAP;
fd_tree2 = open_tree(-EBADF, "/mnt", OPEN_TREE_CLONE, &attr, sizeof(attr));

Link: https://lore.kernel.org/r/20250128-work-mnt_idmap-update-v2-v1-5-c25feb0d2eb3@kernel.org
Reviewed-by: "Seth Forshee (DigitalOcean)" <sforshee@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-01-28 11:33:43 +01:00
commit 2462651ffa
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1 changed files with 32 additions and 21 deletions
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