ovl: document copying layers restrictions with inodes index
The inodes index feature introduces a behavior change - on mount, upper root origin file handle is verified to match the lower root dir. This implies that copied layers cannot be mounted with the inodes index feature enabled, without explicitly removing the upper dir origin xattr and the index dir. The inodes index feature is required to support: - Prevent breaking hardlinks on copy up - NFS export support (upcoming) - Overlayfs snapshots (POC) Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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