> 2025年7月16日 20:17，Christoph Hellwig <hch@xxxxxx> 写道： > > On Wed, Jul 16, 2025 at 08:16:34PM +0800, Coly Li wrote: >> >> >>> 2025年7月16日 20:14，Christoph Hellwig <hch@xxxxxx> 写道： >>> >>> On Wed, Jul 16, 2025 at 08:10:33PM +0800, Coly Li wrote: >>>> Just like hanlding discard requests, handling raid5 read/write bios should >>>> try to split the large bio into opt_io_size aligned both *offset* and >>>> *length*. If I understand correctly, bio_split_to_limits() doesn't handle >>>> offset alignment for read5 read/write bios. >>> >>> Well, if you want offset alignment, set chunk_sectors. >>> >> >> Do you mean setting max_hw_sectors as chunk_sectors? > > Setting both to the desired value (full stipe width). > Do you mean setting chunk_size as (chunk_size * data_disks)? This is deadlock… If opt_io_size is (chunk_size * data_disks), setting new max_hw_sectors as rounddown(current max_hw_sectors, opt_io_size) is good idea. Thanks. Coly Li
