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From: Zhi Hui Li <zhihuili@linux.vnet.ibm.com>
To: QEMU-devel <qemu-devel@nongnu.org>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
	Markus Armbruster <armbru@redhat.com>
Subject: [Qemu-devel] I have some questions in block , can anyone help me, thank you!
Date: Mon, 14 Nov 2011 13:47:41 +0800	[thread overview]
Message-ID: <4EC0AB7D.2020807@linux.vnet.ibm.com> (raw)
In-Reply-To: <m3bosnnlsp.fsf@blackfin.pond.sub.org>


questions:

1) In qcow2.c, in function: qcow2_co_readv
    In qcow2.h, in struct BDRVQcowState
I want to know the relations between sector_num in function 
qcow2_co_readv and cluster_sectors in struct BDRVQcowState ?



2) In qcow2.c, in function; qcow2_co_writev
at line 547:

index_in_cluster = sector_num & (s->cluster_sectors - 1);
How to understand it ?


3) In qcow2.c,  in the function  : qcow2_co_readv and qcow2_co_writev
I want to know the least unit that it was read by the function.
for example:
BDRVQcowState s;
Is s->cluster_size or 512 ?



Thank you very much !

Best regards!

  parent reply	other threads:[~2011-11-14  5:48 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-07  7:46 [Qemu-devel] backing_file Path Zhi Hui Li
2011-11-07  9:17 ` Kevin Wolf
2011-11-07 15:03 ` Markus Armbruster
     [not found]   ` <4EB89ED1.90307@linux.vnet.ibm.com>
     [not found]     ` <m3bosnnlsp.fsf@blackfin.pond.sub.org>
2011-11-14  5:47       ` Zhi Hui Li [this message]
2011-11-14 10:00         ` [Qemu-devel] I have some questions in block , can anyone help me, thank you! Stefan Hajnoczi
2011-11-15  6:56           ` Zhi Hui Li

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