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mnt: Update detach_mounts to leave mounts connected
Now that it is possible to lazily unmount an entire mount tree and leave the individual mounts connected to each other add a new flag UMOUNT_CONNECTED to umount_tree to force this behavior and use this flag in detach_mounts. This closes a bug where the deletion of a file or directory could trigger an unmount and reveal data under a mount point. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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