btrfs-progs: tests: enable check lowmem in travis CI

[platform/upstream/btrfs-progs.git] / cmds-check.c

diff --git a/cmds-check.c b/cmds-check.c
index 7eb08b6..e746ee7 100644 (file)
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -11850,6 +11850,30 @@ static int check_tree_block_ref(struct btrfs_root *root,
                if (!ret)
                        found_ref = 1;
        }
+       /*
+        * Finally check SHARED BLOCK REF, any found will be good
+        * Here we're not doing comprehensive extent backref checking,
+        * only need to ensure there is some extent referring to this
+        * tree block.
+        */
+       if (!found_ref) {
+               btrfs_release_path(&path);
+               key.objectid = bytenr;
+               key.type = BTRFS_SHARED_BLOCK_REF_KEY;
+               key.offset = (u64)-1;
+
+               ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
+               if (ret < 0) {
+                       err |= BACKREF_MISSING;
+                       goto out;
+               }
+               ret = btrfs_previous_extent_item(extent_root, &path, bytenr);
+               if (ret) {
+                       err |= BACKREF_MISSING;
+                       goto out;
+               }
+               found_ref = 1;
+       }
        if (!found_ref)
                err |= BACKREF_MISSING;
 out:
@@ -12494,11 +12518,17 @@ static int check_extent_data_backref(struct btrfs_fs_info *fs_info,
                 * Except normal disk bytenr and disk num bytes, we still
                 * need to do extra check on dbackref offset as
                 * dbackref offset = file_offset - file_extent_offset
+                *
+                * Also, we must check the leaf owner.
+                * In case of shared tree blocks (snapshots) we can inherit
+                * leaves from source snapshot.
+                * In that case, reference from source snapshot should not
+                * count.
                 */
                if (btrfs_file_extent_disk_bytenr(leaf, fi) == bytenr &&
                    btrfs_file_extent_disk_num_bytes(leaf, fi) == len &&
                    (u64)(key.offset - btrfs_file_extent_offset(leaf, fi)) ==
-                   offset)
+                   offset && btrfs_header_owner(leaf) == root_id)
                        found_count++;
 
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