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Re: [Qemu-devel] [PATCH 04/32] vvfat: Do not clobber the user's geometry
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH 04/32] vvfat: Do not clobber the user's geometry |
Date: |
Thu, 05 Jul 2012 09:06:38 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 04.07.2012 18:25, schrieb Paolo Bonzini:
> Il 04/07/2012 17:23, Kevin Wolf ha scritto:
>>>> opts LCHS def. PCHS
>>>> :floppy: 80, 2,36 5,16,63
>>>> :32:floppy: 80, 2,36 5,16,63
>>>> :16:floppy: 80, 2,36 5,16,63
>>>> :12:floppy: 80, 2,18 2,16,63
>>>>
>>>> Silly thing to do for use with a hard disk.
>>>>
>>>> However, the "raw" format can be suppressed by adding an
>>>> redundant-looking "format=vvfat" to "file=fat:FOO". Then, vvfat's
>>>> hint clobbers the user's geometry, i.e. -drive options cyls, heads,
>>>> secs get silently ignored. Don't do that.
>>>>
>>>> No change without format=vvfat. With it, the user's hard disk
>>>> geometry (-drive options cyls, heads, secs) is now obeyed, and the
>>>> default hard disk geometry with :floppy: now matches the one without
>>>> format=vvfat.
>>>>
>>>> Signed-off-by: Markus Armbruster <address@hidden>
>> For some values of "obeyed". If I understand correctly, the user defined
>> geometry will indeed by visible for the device emulation now, but this
>> still doesn't mean that vvfat also provides an image that matches this
>> geometry. Not sure if it is a good idea to allow such mismatches.
>>
>
> Does this only matter if you declare an image with :floppy: and pass it
> as a hard disk? Then we can honestly say we don't care...
As I understand it, the patch has two effect:
1. the user's hard disk geometry (-drive options cyls, heads, secs) is
now obeyed
2. the default hard disk geometry with :floppy: now matches the one
without format=vvfat
I don't care about 2. indeed, but doing 1. right would be nice.
Kevin