On Wed, Apr 14, 2021 at 05:23:53PM +0000, Trond Myklebust wrote: > On Wed, 2021-04-14 at 13:05 -0400, J. Bruce Fields wrote: > > On Wed, Apr 14, 2021 at 10:40:33AM -0400, bfields wrote: > > > Thanks! Testing.... > > > > ... and, test results back with these two patches applied, looks > > good! > > So, just out of curiosity. With which backing filesystem were you > testing? If it was XFS, then note that you may have been testing the > CLONE functionality instead of copy offload. As you saw, I added the > same fix for both clone and copy offload because they have the same > requirements for how the page and attribute caches are handled, so the > end result should be the same. However the unpatched code is very > different for the two methods, and clone may have been missing more > functionality than the actual copy-offload was. I think it was actually xfs, but I did look at a trace and my memory is it was trying a CLONE and falling back on COPY. I'll double check.... --b. > > > > > --b. > > > > > > > > --b. > > > > > > On Wed, Apr 14, 2021 at 10:31:38AM -0400, trondmy@xxxxxxxxxx wrote: > > > > From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> > > > > > > > > When a copy offload is performed, we do not expect the source > > > > file to > > > > change other than perhaps to see the atime be updated. > > > > > > > > Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> > > > > --- > > > > fs/nfs/nfs42proc.c | 7 +------ > > > > 1 file changed, 1 insertion(+), 6 deletions(-) > > > > > > > > diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c > > > > index 3875120ef3ef..a24349512ffe 100644 > > > > --- a/fs/nfs/nfs42proc.c > > > > +++ b/fs/nfs/nfs42proc.c > > > > @@ -390,12 +390,7 @@ static ssize_t _nfs42_proc_copy(struct file > > > > *src, > > > > } > > > > > > > > nfs42_copy_dest_done(dst_inode, pos_dst, res- > > > > >write_res.count); > > > > - > > > > - spin_lock(&src_inode->i_lock); > > > > - nfs_set_cache_invalid(src_inode, NFS_INO_REVAL_PAGECACHE > > > > | > > > > - > > > > NFS_INO_REVAL_FORCED | > > > > - > > > > NFS_INO_INVALID_ATIME); > > > > - spin_unlock(&src_inode->i_lock); > > > > + nfs_invalidate_atime(src_inode); > > > > status = res->write_res.count; > > > > out: > > > > if (args->sync) > > > > -- > > > > 2.30.2 > > -- > Trond Myklebust > Linux NFS client maintainer, Hammerspace > trond.myklebust@xxxxxxxxxxxxxxx > >
