LU-14286 osd-ldiskfs: don't read unwritten blocks

[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_io.c

diff --git a/lustre/osd-ldiskfs/osd_io.c b/lustre/osd-ldiskfs/osd_io.c
index 77843ff..66db3f5 100644 (file)
--- a/lustre/osd-ldiskfs/osd_io.c
+++ b/lustre/osd-ldiskfs/osd_io.c
@@ -1156,6 +1156,14 @@ cont_map:
                                        total++;
                                        break;
                                }
                                        total++;
                                        break;
                                }

+                               if ((map.m_flags & LDISKFS_MAP_UNWRITTEN) &&
+                                   !create) {
+                                       /* don't try to read allocated, but
+                                        * unwritten blocks, instead fill the
+                                        * patches with zeros in osd_do_bio() */
+                                       *(blocks + total) = 0;
+                                       continue;
+                               }

                                *(blocks + total) = map.m_pblk + c;
                                /* unmap any possible underlying
                                 * metadata from the block device
                                *(blocks + total) = map.m_pblk + c;
                                /* unmap any possible underlying
                                 * metadata from the block device