[U-Boot] [PATCH] jffs2: cache data_crc results

[Michael Lawnick]

Ilya Yanok said the following:
> As we moved data_crc() invocation from jffs2_1pass_build_lists() to
> jffs2_1pass_read_inode() data_crc is going to be calculated on each
> inode access. This patch adds caching of data_crc() results. There
> is no significant improvement in speed (because of flash access
> caching added in previous patch I think, crc in RAM is really fast)
> but this patch impacts memory usage -- every b_node structure uses
> 12 bytes instead of 8.
> 
> Signed-off-by: Alexey Neyman <avn at emcraft.com>
> Signed-off-by: Ilya Yanok <yanok at emcraft.com>
> ---
>  fs/jffs2/jffs2_1pass.c   |    5 ++++-
>  fs/jffs2/jffs2_private.h |    1 +
>  2 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
> index 9d9ac1a..b41c299 100644
> --- a/fs/jffs2/jffs2_1pass.c
> +++ b/fs/jffs2/jffs2_1pass.c
> @@ -768,7 +768,10 @@ jffs2_1pass_read_inode(struct b_lists *pL, u32 inode, char *dest)
>  					put_fl_mem(jNode, pL->readbuf);
>  					continue;
>  				}
> -				if (!data_crc(jNode)) {
> +				if (b->datacrc == CRC_UNKNOWN)
> +					b->datacrc = data_crc(jNode) ?
> +						CRC_OK : CRC_BAD;
> +				if (b->datacrc == CRC_BAD) {
>  					put_fl_mem(jNode, pL->readbuf);
>  					continue;
>  				}
> diff --git a/fs/jffs2/jffs2_private.h b/fs/jffs2/jffs2_private.h
> index b3fab1c..7a9eda6 100644
> --- a/fs/jffs2/jffs2_private.h
> +++ b/fs/jffs2/jffs2_private.h
> @@ -7,6 +7,7 @@
>  struct b_node {
>  	u32 offset;
>  	struct b_node *next;
> +	enum { CRC_UNKNOWN = 0, CRC_OK, CRC_BAD } datacrc;
>  };
>  
>  struct b_list {

Could be so kind to give us your source reference?
I can't find above code in u-boot 1.3.3 nor 1.3.4

The same seems to apply to the other patches you've sent yesterday :-(

I'm eagerly waiting for summary patch ;-)

Regards,
Michael