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btrfs: use btrfs_read_node_slot in btrfs_qgroup_trace_subtree

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We're open-coding btrfs_read_node_slot() here, replace with the helper.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-11-05 10:45:17 -05:00 committed by David Sterba
parent 3acfbd6a99
commit 182c79fcb8
1 changed files with 3 additions and 12 deletions
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15
fs/btrfs/qgroup.c
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@ -2232,30 +2232,21 @@ walk_down:
level = root_level;
while (level >= 0) {
if (path->nodes[level] == NULL) {
struct btrfs_key first_key;
int parent_slot;
u64 child_gen;
u64 child_bytenr;
/*
* We need to get child blockptr/gen from parent before
* we can read it.
* We need to get child blockptr from parent before we
* can read it.
*/
eb = path->nodes[level + 1];
parent_slot = path->slots[level + 1];
child_bytenr = btrfs_node_blockptr(eb, parent_slot);
child_gen = btrfs_node_ptr_generation(eb, parent_slot);
btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
eb = read_tree_block(fs_info, child_bytenr, child_gen,
level, &first_key);
eb = btrfs_read_node_slot(eb, parent_slot);
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
goto out;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
ret = -EIO;
goto out;
}
path->nodes[level] = eb;