btrfs-progs: check: disambiguate between cases where add_tree_backref fails

See https://bugzilla.redhat.com/show_bug.cgi?id=1435567 for an example
where the message occurs.

Signed-off-by: Christophe de Dinechin <dinechin@redhat.com>
[ un-indent strings overfowing 80 cols ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/cmds-check.c b/cmds-check.c
index ec56bba..e825119 100644 (file)
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -6833,14 +6833,16 @@ static int process_extent_item(struct btrfs_root *root,
                        ret = add_tree_backref(extent_cache, key.objectid,
                                        0, offset, 0);
                        if (ret < 0)
-                               error("add_tree_backref failed: %s",
+                               error(
+                       "add_tree_backref failed (extent items tree block): %s",
                                      strerror(-ret));
                        break;
                case BTRFS_SHARED_BLOCK_REF_KEY:
                        ret = add_tree_backref(extent_cache, key.objectid,
                                        offset, 0, 0);
                        if (ret < 0)
-                               error("add_tree_backref failed: %s",
+                               error(
+                       "add_tree_backref failed (extent items shared block): %s",
                                      strerror(-ret));
                        break;
                case BTRFS_EXTENT_DATA_REF_KEY:
@@ -7754,7 +7756,8 @@ static int run_next_block(struct btrfs_root *root,
                                ret = add_tree_backref(extent_cache,
                                                key.objectid, 0, key.offset, 0);
                                if (ret < 0)
-                                       error("add_tree_backref failed: %s",
+                                       error(
+                               "add_tree_backref failed (leaf tree block): %s",
                                              strerror(-ret));
                                continue;
                        }
@@ -7762,7 +7765,8 @@ static int run_next_block(struct btrfs_root *root,
                                ret = add_tree_backref(extent_cache,
                                                key.objectid, key.offset, 0, 0);
                                if (ret < 0)
-                                       error("add_tree_backref failed: %s",
+                                       error(
+                               "add_tree_backref failed (leaf shared block): %s",
                                              strerror(-ret));
                                continue;
                        }
@@ -7867,7 +7871,8 @@ static int run_next_block(struct btrfs_root *root,
                        ret = add_tree_backref(extent_cache, ptr, parent,
                                        owner, 1);
                        if (ret < 0) {
-                               error("add_tree_backref failed: %s",
+                               error(
+                               "add_tree_backref failed (non-leaf block): %s",
                                      strerror(-ret));
                                continue;
                        }