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Commit c0872323 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
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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: default avatarQu Wenruo <wqu@suse.com>
Reviewed-by: default avatarLu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5e388e95

fs/btrfs/print-tree.c

+15 −10
Original line number Diff line number Diff line
@@ -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);

	}

}

fs/btrfs/print-tree.h

+1 −1
Original line number Diff line number Diff line
@@ -7,6 +7,6 @@ 
#define BTRFS_PRINT_TREE_H



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);



#endif