• Stephen Warren's avatar
    fs: ext4: cache extent data · d5aee659
    Stephen Warren authored
    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: default avatarStephen Warren <swarren@nvidia.com>