On 7.03.2018 14:14, Qu Wenruo wrote: > > <snip> >>> >>> SHARED flag is determined after extent map merge, so here we can't rely >>> on em here. >> >> Shouldn't extent maps correspond to 1:1 disk-state. I.e. they are just >> the memory cache of the extent state. So if we merge them, shouldn't we >> also merge the on-disk extents as well ? > > Not 1:1. > > In memory one is merged maybe to save memory. > > But on-disk file extents has size limit. > For compressed one it's 128K and 128M for uncompressed one. Fair enough, however 4 extents, 16k each should warrant merging on-disk as well, no ? <snip> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
