Merge tag 'iommu-updates-v4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro...

[firefly-linux-kernel-4.4.55.git] / fs / xfs / xfs_mount.h

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index a5b2ff8226535d44443ce08369162f01e1d0cce2..0d8abd6364d97e613d98d4f827814c7eb7beb207 100644 (file)
--- 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;
 
 /*