[JDK-8165852] (fs) Mount point not found for a file which is present in overlayfs - Java Bug System



[JDK-8165852] (fs) Mount point not found for a file which is present in overlayfs - Java Bug System

The problem as it manifests in btrfs is essentially the same situation as observed for overlayfs in docker: the parent of a path component has a different device ID than that of the current path component and so the loop of the upwards traversal towards the root is broken out of but there is no entry for the current path component in /proc/mounts. This was observed to occur specifically for the case of a file contained in a btrfs sub-volume which is not itself explicitly mounted. If the sub-volume is mounted via `mount` it shows up in /proc/mounts and the error does not occur. This failure might be due to the nature of btrfs sub-volumes and unrelated to Docker per se.
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bpb Brian Burkhalter added a comment - - edited The problem as it manifests in btrfs is essentially the same situation as observed for overlayfs in docker: the parent of a path component has a different device ID than that of the current path component and so the loop of the upwards traversal towards the root is broken out of but there is no entry for the current path component in /proc/mounts. This was observed to occur specifically for the case of a file contained in a btrfs sub-volume which is not itself explicitly mounted. If the sub-volume is mounted via `mount` it shows up in /proc/mounts and the error does not occur. This failure might be due to the nature of btrfs sub-volumes and unrelated to Docker per se.


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