1 files changed, 19 insertions, 2 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index c25b094efbf7..4beaede43277 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -399,9 +399,26 @@ xfs_growfs_data_private(
 
         /* update secondary superblocks. */
         for (agno = 1; agno < nagcount; agno++) {
-                error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
+                error = 0;
+                /*
+                 * new secondary superblocks need to be zeroed, not read from
+                 * disk as the contents of the new area we are growing into is
+                 * completely unknown.
+                 */
+                if (agno < oagcount) {
+                        error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
                                   XFS_FSS_TO_BB(mp, 1), 0, &bp);
+                } else {
+                        bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
+                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
+                                  XFS_FSS_TO_BB(mp, 1), 0);
+                        if (bp)
+                                xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+                        else
+                                error = ENOMEM;
+                }
+
                 if (error) {
                         xfs_warn(mp,
                 "error %d reading secondary superblock for ag %d",
@@ -423,7 +440,7 @@ xfs_growfs_data_private(
                         break; /* no point in continuing */
                 }
         }
-        return 0;
+        return error;
 
  error0:
         xfs_trans_cancel(tp, XFS_TRANS_ABORT);