diff options
| -rw-r--r-- | qapi/block-core.json | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index 1b8b4156b4..3f86675357 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -244,17 +244,25 @@ # # Mapping information from a virtual block range to a host file range # -# @start: the start byte of the mapped virtual range +# @start: virtual (guest) offset of the first byte described by this +# entry # # @length: the number of bytes of the mapped virtual range # -# @data: whether the mapped range has data +# @data: reading the image will actually read data from a file (in +# particular, if @offset is present this means that the sectors +# are not simply preallocated, but contain actual data in raw +# format) # -# @zero: whether the virtual blocks are zeroed +# @zero: whether the virtual blocks read as zeroes # -# @depth: the depth of the mapping +# @depth: number of layers (0 = top image, 1 = top image's backing +# file, ..., n - 1 = bottom image (where n is the number of +# images in the chain)) before reaching one for which the +# range is allocated # -# @offset: the offset in file that the virtual sectors are mapped to +# @offset: if present, the image file stores the data for this range +# in raw format at the given (host) offset # # @filename: filename that is referred to by @offset # |