Commit c3193108 authored by Jan Schmidt's avatar Jan Schmidt
Browse files

Btrfs: fix tree mod log rewinded level and rewinding of moved keys 



When we rewind REMOVE_WHILE_FREEING operations, there's code that allocates
a fresh buffer instead of cloning the old one. Setting that buffer's level
correctly was missing in this case.

When rewinding a MOVE_KEYS operation, btrfs_node_key_ptr_offset(slot) was
missing for memmove_extent_buffer()'s arguments.

Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
parent f395694c

fs/btrfs/ctree.c

+4 −2
Original line number Diff line number Diff line
@@ -1076,7 +1076,9 @@ __tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq, 
			n--;

			break;

		case MOD_LOG_MOVE_KEYS:

			memmove_extent_buffer(eb, tm->slot, tm->move.dst_slot,

			o_dst = btrfs_node_key_ptr_offset(tm->slot);

			o_src = btrfs_node_key_ptr_offset(tm->move.dst_slot);

			memmove_extent_buffer(eb, o_dst, o_src,

					      tm->move.nr_items * p_size);

			break;

		case MOD_LOG_ROOT_REPLACE:
@@ -1127,6 +1129,7 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb, 
		btrfs_set_header_backref_rev(eb_rewin,

					     btrfs_header_backref_rev(eb));

		btrfs_set_header_owner(eb_rewin, btrfs_header_owner(eb));

		btrfs_set_header_level(eb_rewin, btrfs_header_level(eb));

	} else {

		eb_rewin = btrfs_clone_extent_buffer(eb);

		BUG_ON(!eb_rewin);
@@ -2609,7 +2612,6 @@ int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key, 
	}



again:

	level = 0;

	b = get_old_root(root, time_seq);

	extent_buffer_get(b);

	level = btrfs_header_level(b);

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