[PATCH] ubifs: Add zstd support

[Uwe Kleine-König]

Hello,

On Mon, Feb 07, 2022 at 04:14:57PM +0100, Sascha Hauer wrote:
> zstd shows a good compression rate and is faster than lzo. This adds
> UBIFS support for it.
> 
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

This patch is part of 2022.03.0 with commit cd1610d8ab30 ("ubifs: Add
zstd support")

Since then there is a warning in my imx builds (using imx_defconfig):

  CC      fs/ubifs/super.o
fs/ubifs/super.c: In function ‘validate_inode’:
fs/ubifs/super.c:89:28: warning: comparison is always false due to limited range of data type [-Wtype-limits]
   89 |         if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
      |                            ^~

That's because UBIFS_COMPR_TYPES_CNT is now 4 and ui->compr_type is an
unsigned int compr_type:2.

I wonder if the check should just be dropped now that all bits are used,
but I don't feel confident enough to say that's the right thing to do.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |
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