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.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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