From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> The following patch set attempts to add support for the RWF_DONTCACHE flag in preadv2() and pwritev2() on NFS filesystems. The main issue is allowing support on 2 stage writes (i.e. unstable WRITE followed by a COMMIT) since those don't follow the current assumption that the 'dropbehind' flag can be fulfilled as soon as the writeback lock is dropped. Trond Myklebust (3): filemap: Add a helper for filesystems implementing dropbehind filemap: Mark folios as dropbehind in generic_perform_write() NFS: Enable the RWF_DONTCACHE flag for the NFS client fs/nfs/file.c | 2 ++ fs/nfs/nfs4file.c | 2 ++ fs/nfs/write.c | 12 +++++++++++- include/linux/nfs_page.h | 1 + include/linux/pagemap.h | 1 + mm/filemap.c | 21 +++++++++++++++++++++ 6 files changed, 38 insertions(+), 1 deletion(-) -- 2.49.0
