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SubjectRe: [PATCH 1/2] partitions: use sector size for EFI GPT
On Mon, Nov 09 2009, Karel Zak wrote:
> Currently, kernel uses strictly 512-byte sectors for EFI GPT parsing.
> That's wrong.
>
> UEFI standard (version 2.3, May 2009, 5.3.1 GUID Format overview, page
> 95) defines that LBA is always based on the logical block size. It
> means bdev_logical_block_size() (aka BLKSSZGET) for Linux.
>
> This patch removes static sector size from EFI GPT parser.
>
> The problem is reproducible with the latest GNU Parted:
>
> # modprobe scsi_debug dev_size_mb=50 sector_size=4096
>
> # ./parted /dev/sdb print
> Model: Linux scsi_debug (scsi)
> Disk /dev/sdb: 52.4MB
> Sector size (logical/physical): 4096B/4096B
> Partition Table: gpt
>
> Number Start End Size File system Name Flags
> 1 24.6kB 3002kB 2978kB primary
> 2 3002kB 6001kB 2998kB primary
> 3 6001kB 9003kB 3002kB primary
>
> # blockdev --rereadpt /dev/sdb
> # dmesg | tail -1
> sdb: unknown partition table <---- !!!
>
> with this patch:
>
> # blockdev --rereadpt /dev/sdb
> # dmesg | tail -1
> sdb: sdb1 sdb2 sdb3
>
> Signed-off-by: Karel Zak <kzak@redhat.com>

I have applied this patch with the division fixup, and 2/2 as well.
Thanks!

--
Jens Axboe



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