On Sat, Oct 29, 2016 at 11:29 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > On Sat, Oct 29, 2016 at 04:08:22PM +0800, Ming Lei wrote: >> MD(especially raid1 and raid10) is a bit difficult to support >> multipage bvec, so introduce this flag for not enabling multipage >> bvec, then MD can still accept singlepage bvec only, and once >> direct access to bvec table in MD and other fs/drivers are cleanuped, >> the flag can be removed. BTRFS has the similar issue too. > > There is really no good reason for that. The RAID1 and 10 code really > just needs some love to use the bio cloning infrastructure, bio > iterators and generally recent bio apis. btrfs just needs a tiny little > bit of help and I'll send patches soon. That is very nice of you to do this cleanup, cool! I guess it still need a bit time, and hope that won't be the block for the whole patchset, :-) [linux-2.6-next]$git grep -n -E "bi_io_vec|bi_vcnt" ./fs/btrfs/ | wc -l 45 [linux-2.6-next]$git grep -n -E "bi_io_vec|bi_vcnt" ./drivers/md/ | grep raid | wc -l 54 > > Having two different code path is just asking for trouble in the long > run. Definitely, that flag is introduced just as a short-term solution. Thanks, Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
