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btrfs-progs: check: make low memory mode support partially dropped snapshots

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Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Wang Xiaoguang 2016-08-25 13:21:00 +08:00 committed by David Sterba
parent 3f100c5251
commit ac80fca06c
1 changed files with 10 additions and 1 deletions
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11
cmds-check.c
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@ -9063,9 +9063,10 @@ static int check_tree_block_backref(struct btrfs_fs_info *fs_info, u64 root_id,
free_extent_buffer(eb);
btrfs_init_path(&path);
path.lowest_level = level;
/* Search with the first key, to ensure we can reach it */
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret) {
if (ret < 0) {
err |= REFERENCER_MISSING;
goto release_out;
}
@ -9948,6 +9949,8 @@ static int traverse_tree_block(struct btrfs_root *root,
struct extent_buffer *node)
{
struct extent_buffer *eb;
struct btrfs_key key;
struct btrfs_key drop_key;
int level;
u64 nr;
int i;
@ -9993,6 +9996,7 @@ static int traverse_tree_block(struct btrfs_root *root,
}
nr = btrfs_header_nritems(node);
btrfs_disk_key_to_cpu(&drop_key, &root->root_item.drop_progress);
btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) - nr) *
sizeof(struct btrfs_key_ptr);
@ -10000,6 +10004,11 @@ static int traverse_tree_block(struct btrfs_root *root,
for (i = 0; i < nr; i++) {
u64 blocknr = btrfs_node_blockptr(node, i);
btrfs_node_key_to_cpu(node, &key, i);
if (level == root->root_item.drop_level &&
is_dropped_key(&key, &drop_key))
continue;
/*
* As a btrfs tree has most 8 levels (0..7), so it's quite safe
* to call the function itself.