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    ovl: verify index dir matches upper dir · 54fb347e
    Amir Goldstein 提交于
    An index dir contains persistent hardlinks to files in upper dir.
    Therefore, we must never mount an existing index dir with a differnt
    upper dir.
    
    Store the upper root dir file handle in index dir inode when index
    dir is created and verify the file handle before using an existing
    index dir on mount.
    
    Add an 'is_upper' flag to the overlay file handle encoding and set it
    when encoding the upper root file handle. This is not critical for index
    dir verification, but it is good practice towards a standard overlayfs
    file handle format for NFS export.
    Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
    Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
    54fb347e
namei.c 12.9 KB