[PATCH] erofs: tidy up synchronous decompression

[Chao Yu]

On 1/12/2026 11:43 AM, Gao Xiang wrote:
>   - Get rid of `sbi->opt.max_sync_decompress_pages` since it's fixed as
>     3 all the time;
> 
>   - Add Z_EROFS_MAX_SYNC_DECOMPRESS_BYTES in bytes instead of in pages,
>     since for non-4K pages, 3-page limitation makes no sense;
> 
>   - Move `sync_decompress` to sbi to avoid unexpected remount impact;
> 
>   - Fold z_erofs_is_sync_decompress() into its caller;
> 
>   - Better description of sysfs entry `sync_decompress`.
> 
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Reviewed-by: Chao Yu <chao at kernel.org>

Thanks,