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[Qemu-devel] vm disk blockio and fileio


From: longguang.yue
Subject: [Qemu-devel] vm disk blockio and fileio
Date: Mon, 31 Mar 2014 22:09:13 +0800 (CST)

hi,all
from the aspect of qemu, there are file and block  disk type,
what is the final difference between the two types ?
if its type is block and source is volume or physical disk, who finally read/write the disk?
i thought block is raw format, so raw driver will do the actual r/w, am i right?
if so qemu r/w using fileio  no matter what disk type it is ?
 
what is the call flows when disk type is  block when vm r/w?
 
 
thanks



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