btrfs: print-tree: debugging output enhancement

This patch enhances the following things:

- tree block header
  * add generation and owner output for node and leaf
- node pointer generation output
- allow btrfs_print_tree() to not follow nodes
  * just like btrfs-progs

Please note that, although function btrfs_print_tree() is not called by
anyone right now, it's still a pretty useful function to debug kernel.
So that function is still kept for later use.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 124276bba8cf..21a831d3d087 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -189,9 +189,10 @@ void btrfs_print_leaf(struct extent_buffer *l)
         fs_info = l->fs_info;
         nr = btrfs_header_nritems(l);
 
-        btrfs_info(fs_info, "leaf %llu total ptrs %d free space %d",
-                   btrfs_header_bytenr(l), nr,
-                   btrfs_leaf_free_space(fs_info, l));
+        btrfs_info(fs_info,
+                   "leaf %llu gen %llu total ptrs %d free space %d owner %llu",
+                   btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
+                   btrfs_leaf_free_space(fs_info, l), btrfs_header_owner(l));
         for (i = 0 ; i < nr ; i++) {
                 item = btrfs_item_nr(i);
                 btrfs_item_key_to_cpu(l, &key, i);
@@ -325,7 +326,7 @@ void btrfs_print_leaf(struct extent_buffer *l)
         }
 }
 
-void btrfs_print_tree(struct extent_buffer *c)
+void btrfs_print_tree(struct extent_buffer *c, bool follow)
 {
         struct btrfs_fs_info *fs_info;
         int i; u32 nr;
@@ -342,15 +343,19 @@ void btrfs_print_tree(struct extent_buffer *c)
                 return;
         }
         btrfs_info(fs_info,
-                   "node %llu level %d total ptrs %d free spc %u",
-                   btrfs_header_bytenr(c), level, nr,
-                   (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr);
+                   "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
+                   btrfs_header_bytenr(c), level, btrfs_header_generation(c),
+                   nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
+                   btrfs_header_owner(c));
         for (i = 0; i < nr; i++) {
                 btrfs_node_key_to_cpu(c, &key, i);
-                pr_info("\tkey %d (%llu %u %llu) block %llu\n",
+                pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n",
                        i, key.objectid, key.type, key.offset,
-                       btrfs_node_blockptr(c, i));
+                       btrfs_node_blockptr(c, i),
+                       btrfs_node_ptr_generation(c, i));
         }
+        if (!follow)
+                return;
         for (i = 0; i < nr; i++) {
                 struct btrfs_key first_key;
                 struct extent_buffer *next;
@@ -372,7 +377,7 @@ void btrfs_print_tree(struct extent_buffer *c)
                 if (btrfs_header_level(next) !=
                        level - 1)
                         BUG();
-                btrfs_print_tree(next);
+                btrfs_print_tree(next, follow);
                 free_extent_buffer(next);
         }
 }