xfs: implement pNFS export operations
Add operations to export pNFS block layouts from an XFS filesystem. See
the previous commit adding the operations for an explanation of them.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index a5b2ff8..0d8abd6 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -174,6 +174,17 @@
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;
/*