Comment 3 for bug 1075252

Hi Stefan,
Will post later this week/end based on your requirements.

Regards.
Rob.

On Thu, Nov 8, 2012 at 12:15 AM, Stefan Hajnoczi <<email address hidden>
> wrote:

> On Tue, Nov 6, 2012 at 11:38 PM, Robert Hubbard
> <email address hidden> wrote:
> > Duplicate - Same issue related to header/footer - When does the code fix
> > show up in the git release train ?
> >
> > bug 907063 .
>
> The bug reporter did not follow the steps for submitting a patch that I
> posted:
>
> http://wiki.qemu.org/Contribute/SubmitAPatch
>
> Therefore the patch never reached the <email address hidden> mailing
> list and was not merged.
>
> If you'd like to submit your patch please follow the steps on the wiki
> page above.
>
> Thanks,
> Stefan
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1075252
>
> Title:
> qemu-img cannot read VMDK4 file
>
> Status in QEMU:
> New
>
> Bug description:
> Unable to read any vmdk4 type files. Goal was to convert to a qcow2,
> this worked after emitting code.
>
> OS is Centos linux 2.6.32. I pulled the latest git tree down for qemu
> to see if this was resolved, it is not.
>
> Starting program: /home/rhubbard/QEMU/qemu/qemu-img info -f vmdk
> /root/Juniper/beta1candidate-07122012-disk1.vmdk
>
>
> There seems a mismatch with the l1_backup_tble_offset. this is now a
> uint64 type. The value is actually "-512" because of this and this causes
> the code check at line 418 in vmdk.c to erroneously think there is a
> backup table. This causes vmdk open to fail.
> and message
> qemu failed to open ....
>
>
> from debug;
> gdb) x/4x &(s->l1_backup_table_offset)
> 0xa61cd0: 0xfffffe00 0xffffffff 0x00a62770 0x00000000
>
> (gdb) p *s
> $1 = {hd = 0x0, l1_table_offset = 0, l1_backup_table_offset = -512,
> l1_table = 0xa62770,
> l1_backup_table = 0x0, l1_size = 64, l1_entry_sectors = 65536, l2_size
> = 512, l2_cache = 0x0,
> l2_cache_offsets = {0 <repeats 16 times>}, l2_cache_counts = {0
> <repeats 16 times>},
> cluster_sectors = 128, parent_cid = 4294967295}
>
> typedef struct BDRVVmdkState {
> BlockDriverState *hd;
> int64_t l1_table_offset;
> <==== ??? - what should this be , don't know what the actual layout on the
> vmdk spec says , is this a 64bit / 8 byte field ?
>
> int64_t l1_backup_table_offset;
> uint32_t *l1_table;
> uint32_t *l1_backup_table;
> unsigned int l1_size;
> uint32_t l1_entry_sectors;
>
> unsigned int l2_size;
>
> from vmdk.c
> /*!!! if (s->l1_backup_table_offset) {
> s->l1_backup_table = qemu_malloc(l1_size);
> if (bdrv_pread(bs->file, s->l1_backup_table_offset,
> s->l1_backup_table, l1_size) != l1_size)
> goto fail;
>
> Breaks here..
>
> Don't know the correct fix , thanks for help.
>
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>

--
Regards

Rob Hubbard