pnfs: Add layout driver flag PNFS_LAYOUTGET_ON_OPEN

Driver can set flag to allow LAYOUTGET to be sent with OPEN.

Signed-off-by: Fred Isaman <fred.isaman@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index c75ad982bcfc..3ae038d9c292 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -2347,6 +2347,7 @@ static struct pnfs_layoutdriver_type flexfilelayout_type = {
         .id                     = LAYOUT_FLEX_FILES,
         .name                   = "LAYOUT_FLEX_FILES",
         .owner                  = THIS_MODULE,
+        .flags                  = PNFS_LAYOUTGET_ON_OPEN,
         .set_layoutdriver       = ff_layout_set_layoutdriver,
         .alloc_layout_hdr       = ff_layout_alloc_layout_hdr,
         .free_layout_hdr        = ff_layout_free_layout_hdr,
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index daf6cbf5c15f..f71a55f11b97 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -110,6 +110,7 @@ enum layoutdriver_policy_flags {
         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
         PNFS_READ_WHOLE_PAGE            = 1 << 2,
+        PNFS_LAYOUTGET_ON_OPEN          = 1 << 3,
 };
 
 struct nfs4_deviceid_node;