1 files changed, 11 insertions, 0 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index a5b2ff822653..0d8abd6364d9 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -174,6 +174,17 @@ typedef struct xfs_mount {
         struct workqueue_struct *m_reclaim_workqueue;
         struct workqueue_struct *m_log_workqueue;
         struct workqueue_struct *m_eofblocks_workqueue;
+
+        /*
+         * Generation of the filesysyem layout.  This is incremented by each
+         * growfs, and used by the pNFS server to ensure the client updates
+         * its view of the block device once it gets a layout that might
+         * reference the newly added blocks.  Does not need to be persistent
+         * as long as we only allow file system size increments, but if we
+         * ever support shrinks it would have to be persisted in addition
+         * to various other kinds of pain inflicted on the pNFS server.
+         */
+        __uint32_t              m_generation;
 } xfs_mount_t;
 
 /*