On Thu, 15 Jul 2010 12:12:13 -0400, Chris Mason <chris.mason@xxxxxxxxxx> wrote:
>>>> It seems that the btrfs doesn't support the sectorsize which is
>>>> greater than the page size just like ext2/3/4, though we can use
>>>> mkfs.btrfs to make a filesystem with a big sectorsize. Am I right?
>>>>
>>>> If yes, we must do more check in the mkfs.btrfs.
>>>>
>>>
>>> yes, btrfs doesn't support the sectorsize> PAGE_size.
>>>
>>
>> So we must do more check in the mkfs.btrfs to avoid misuse, and I'll
>> add some check of the sectorsize into the mkfs.btrfs.
>
> Yes, but this is fixed up with the raid code, we'll allow different page
> sizes.
Is the raid code that you said the initialization code for the block devices?
just like this:
fs/btrfs/volumes.c:1430
int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
{
[snip]
set_blocksize(device->bdev, 4096);
[snip]
}
If yes, it uses a hard-code value to initialize the blocksize of the block device,
not the blocksize of the btrfs, so the btrfs doesn't check the blocksize of the btrfs.
Thanks
Miao Xie
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