Add comment in detail for commit 433957bb7f (qapi: Make parameter 'file' optional for BlockdevCreateOptionsLUKS).
Signed-off-by: Hyman Huang <yong.hu...@smartx.com> --- qapi/block-core.json | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index ab5a93a966..42b0840d43 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -4973,7 +4973,25 @@ ## # @BlockdevCreateOptionsLUKS: # -# Driver specific image creation options for LUKS. +# Driver specific image creation options for LUKS. Note that +# @file is required if @preallocation is specified and equals +# PREALLOC_MODE_ON. The following three scenarios determine how +# creation logic behaves when @preallocation is either equal to +# PREALLOC_MODE_OFF or is not given: +# +# 1) When @file is given only, format the block device referenced +# by @file as the LUKS specification and trunk it to the @size. +# In this case, the @size should reflect amount of space made +# available to the guest, so the trunk size must take account +# of that which will be used by the crypto header. +# +# 2) When @header is given only, just format the block device +# referenced by @header as the LUKS specification. +# +# 3) When both @file and @header are given, block device +# referenced by @file should be trunked to @size, and block +# device referenced by @header should be formatted as the LUKS +# specification. # # @file: Node to create the image format on, mandatory except when # 'preallocation' is not requested -- 2.39.3
