• Paolo Bonzini's avatar
    qemu-img: always probe the input image for allocated sectors · e4a86f88
    Paolo Bonzini authored
    
    
    qemu-img convert can assume "that sectors which are unallocated in the
    input image are present in both the output's and input's base images".
    
    However it is only doing this if the output image returns true for
    bdrv_has_zero_init().  Testing bdrv_has_zero_init() does not make much
    sense if the output image is copy-on-write, because a copy-on-write
    image is never initialized to zero (it is initialized to the content
    of the backing file).
    
    There is nothing here that makes has_zero_init images special.  The
    input and output must be equal for the operation to make sense, and
    that's it.
    Reviewed-by: default avatarEric Blake <eblake@redhat.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
    e4a86f88
qemu-img.c 68 KB