NFS: Allow the nfs_pageio_descriptor to signal that a re-coalesce is needed

If an attempt to do pNFS fails, and we have to fall back to writing through
the MDS, then we may want to re-coalesce the requests that we already have
since the block size for the MDS read/writes may be different to that of
the DS read/writes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index db3194f63479..7241b2a2a4d6 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -68,7 +68,8 @@ struct nfs_pageio_descriptor {
         size_t                  pg_count;
         size_t                  pg_bsize;
         unsigned int            pg_base;
-        char                    pg_moreio;
+        unsigned char           pg_moreio : 1,
+                                pg_recoalesce : 1;
 
         struct inode            *pg_inode;
         const struct nfs_pageio_ops *pg_ops;