On Fri, Feb 05, 2021 at 12:55:35PM +0000, fdman...@kernel.org wrote: > From: Filipe Manana <fdman...@suse.com> > > The following patchset fixes 2 bugs with the swapfile support, where we can > end up falling back to COW when writing to an active swapfile. The first patch > is actually independent and just makes the nocow buffered IO path more > efficient > by eliminating a repeated check for a read-only block group. > > V2: Removed the part of optimizing the direct IO nocow path from patch 2, > because removing the RO block group check from can_nocow_extent() would > leave the buffered write path that checks if we can fallback to nocow at > write time (and not writeback time), after hitting ENOSPC when attempting > to reserve data space, from doing that check. The optimization can still > be done, but that would require adding more context information to > can_nocow_extent(), so it could know when it needs to check if the block > group is RO or not - since things are a bit entangled around that function > and its callers, I've left it out for now. > > Filipe Manana (3): > btrfs: avoid checking for RO block group twice during nocow writeback > btrfs: fix race between writes to swap files and scrub > btrfs: fix race between swap file activation and snapshot creation
Added to for-next, thanks. Target merge is 5.12-rc.
