[PATCH v6 2/2] erofs: boost negative xattr lookup with bloom filter

[Gao Xiang]

On 2023/7/22 17:45, Jingbo Xu wrote:
> Optimise the negative xattr lookup with bloom filter.
> 
> The bit value for the bloom filter map has a reverse semantics for
> compatibility.  That is, the bit value of 0 indicates existence, while
> the bit value of 1 indicates the absence of corresponding xattr.
> 
> The initial version is _only_ enabled when xattr_filter_reserved is
> zero.  The filter map internals may change in the future, in which case
> the reserved flag will be set non-zero and we don't need bothering the
> compatible bits again at that time.  For now disable the optimization if
> this reserved flag is non-zero.
> 
> Signed-off-by: Jingbo Xu <jefflexu at linux.alibaba.com>

Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Thanks,
Gao Xiang