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authorPaolo Bonzini <pbonzini@redhat.com>2013-09-04 19:00:29 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2013-09-06 15:25:09 +0200
commit4333bb71405f58a8dc8d3255feb3ca5960b0daf8 (patch)
tree68229e0bed3ae42b5d0dd7eb36bb068480cd405a /Makefile
parentb6b8a33354a448ee421f57676c1a93a536a63269 (diff)
block: define get_block_status return value
Define the return value of get_block_status. Bits 0, 1, 2 and 9-62 are valid; bit 63 (the sign bit) is reserved for errors. Bits 3-8 are left for future extensions. The return code is compatible with the old is_allocated API: if a driver only returns 0 or 1 (aka BDRV_BLOCK_DATA) like is_allocated used to, clients of is_allocated will not have any change in behavior. Still, we will return more precise information in the next patches and the new definition of bdrv_is_allocated is already prepared for this. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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