[U-Boot] fs: ext4: cache extent data

[Tom Rini]

On Wed, Jan 30, 2019 at 12:58:05PM -0700, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> When a file contains extents, U-Boot currently reads extent-related data
> for each block in the file, even if that data is located in the same
> block each time. This significantly slows down loading of files that use
> extents. Implement a very dumb cache to prevent repeatedly reading the
> same block. Files with extents now load as fast as files without.
> 
> Note: There are many cases where read_allocated_block() is called. This
> patch only addresses one of those places; all others still read redundant
> data in any case they did before. This is a minimal patch to fix the
> load command; other cases aren't fixed.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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