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btrfs: get mapping tree directly from fsinfo in find_first_block_group 

We already have an fs_info in our function parameters, there's no need
to do the maths again and get fs_info from the extent_root just to get
the mapping_tree.

Instead directly grab the mapping_tree from fs_info.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2020-06-02 19:05:56 +09:00 committed by David Sterba
parent 96f9b0f2fa
commit 89d7da9bc5
1 changed files with 1 additions and 1 deletions
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fs/btrfs/block-group.c
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@ -1566,7 +1566,7 @@ static int find_first_block_group(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree; struct extent_map_tree *em_tree;
struct extent_map *em; struct extent_map *em;
em_tree = &root->fs_info->mapping_tree; em_tree = &fs_info->mapping_tree;
read_lock(&em_tree->lock); read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, found_key.objectid, em = lookup_extent_mapping(em_tree, found_key.objectid,
found_key.offset); found_key.offset);