[PATCH U-boot v2] fs: btrfs: fix the false alert of decompression failure

Tom Rini trini at konsulko.com
Tue Apr 27 18:46:02 CEST 2021

On Sat, Apr 17, 2021 at 08:52:13PM +0800, Qu Wenruo wrote:

> There are some cases where decompressed sectors can have padding zeros.
> In kernel code, we have lines to address such situation:
>         /*
>          * btrfs_getblock is doing a zero on the tail of the page too,
>          * but this will cover anything missing from the decompressed
>          * data.
>          */
>         if (bytes < destlen)
>                 memset(kaddr+bytes, 0, destlen-bytes);
>         kunmap_local(kaddr);
> But not in U-boot code, thus we have some reports of U-boot failed to
> read compressed files in btrfs.
> Fix it by doing the same thing of the kernel, for both inline and
> regular compressed extents.
> Reported-by: Matwey Kornilov <matwey.kornilov at gmail.com>
> Link: https://bugzilla.suse.com/show_bug.cgi?id=1183717
> Fixes: a26a6bedafcf ("fs: btrfs: Introduce btrfs_read_extent_inline() and btrfs_read_extent_reg()")
> Signed-off-by: Qu Wenruo <wqu at suse.com>

Applied to u-boot/master, thanks!

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