On 2012-01-25, at 3:48 PM, Dave Chinner wrote:
> On Mon, Jan 23, 2012 at 08:51:53PM +0800, Robin Dong wrote:
>> Hi Ted, Andreas and the list,
>>
>> After the bigalloc-feature is completed in ext4, we could have much more
>> big size of block-group (also bigger continuous space), but the extent
>> structure of files now limit the extent size below 128MB, which is not
>> optimal.
>>
>> We could solve the problem by creating a new extent format to support
>> larger extent size, which looks like this:
>>
>> struct ext4_extent2 {
>> __le64 ee_block; /* first logical block extent covers */
>> __le64 ee_start; /* starting physical block */
>> __le32 ee_len; /* number of blocks covered by extent */
>> __le32 ee_flags; /* flags and future extension */
>> };
>>
>> struct ext4_extent2_idx {
>> __le64 ei_block; /* index covers logical blocks from 'block' */
>> __le64 ei_leaf; /* pointer to the physical block of the next level */
>> __le32 ei_flags; /* flags and future extension */
>> __le32 ei_unused; /* padding */
>> };
>>
>> I think we could keep the structure of ext4_extent_header and add new
>> imcompat flag EXT4_FEATURE_INCOMPAT_EXTENTS2.
>>
>> The new extent format could support 16TB continuous space and larger volumes.
>>
>> What's your opinion?
>
> Just use XFS.
Thanks for your troll.
If you have something actually useful to contribute, please feel free to post.
Otherwise, this is a list for ext4 development.
I don't encourage XFS users to switch to ext4 (or ZFS, for that matter, since
ZFS can do a lot of things that just aren't possible for XFS, and is now
available for Linux) on your mailing lists, and I'd appreciate the same
courtesy here...
Cheers, Andreas
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