On Mon, Oct 24, 2016 at 09:23:04AM +0200, Geert Uytterhoeven wrote: > On Sat, Oct 15, 2016 at 2:46 AM, Linux Kernel Mailing List > <linux-kernel@vger.kernel.org> wrote: > > Web: > > https://git.kernel.org/torvalds/c/2fe1d55134fce05c17ea118a2e37a4af771887bc > > Commit: 2fe1d55134fce05c17ea118a2e37a4af771887bc > > 520f16abf003952d in v4.7.10 > 1ff6341b5d92dd6b in v4.8.4 > > > Parent: 08895a8b6b06ed2323cd97a36ee40a116b3db8ed > > Refname: refs/heads/master > > Author: Omar Sandoval <osan...@fb.com> > > AuthorDate: Thu Sep 22 17:24:20 2016 -0700 > > Committer: David Sterba <dste...@suse.com> > > CommitDate: Mon Oct 3 18:52:14 2016 +0200 > > > > Btrfs: fix free space tree bitmaps on big-endian systems > > > > In convert_free_space_to_{bitmaps,extents}(), we buffer the free space > > bitmaps in memory and copy them directly to/from the extent buffers with > > {read,write}_extent_buffer(). The extent buffer bitmap helpers use byte > > granularity, which is equivalent to a little-endian bitmap. This means > > that on big-endian systems, the in-memory bitmaps will be written to > > disk byte-swapped. To fix this, use byte-granularity for the bitmaps in > > memory. > > This change looks overly complex to me, and decreases performance.
We had to make it correct, performance is not an issue at the moment.
