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Re: [Qemu-devel] [PATCH] block: Add -drive detect_zero=on|off option to

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH] block: Add -drive detect_zero=on|off option to detect all zero writes.
Date: Mon, 30 Jul 2012 16:38:25 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

Am 30.07.2012 16:09, schrieb Paolo Bonzini:
> Il 30/07/2012 16:03, Eric Blake ha scritto:
>> Ooh, nice bullet point to add to my upcoming presentation at Linux
>> Plumber's Conference in a month:
>> http://summit.linuxplumbersconf.org/lpc-2012/meeting/33/lpc2012-ref-improved-virt-disk-handling/
>> Does anyone else have some annoyances about large sparse file handling
>> where improving the kernel would make our life easier, that I should
>> incorporate into my discussion?
> In case you haven't mentioned them:
> * lseek(SEEK_HOLE/SEEK_DATA) support in the block layer using GET LBA
> * support for connecting to an iSCSI target without scanning partitions.
> * support for fsync/fdatasync with ranges (or alternatively,
> sync_file_range that writes metadata).

In the context of libguestfs we recently found this one:

* sync() should actually flush the disk caches


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