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btrfs: don't use set/get token in leaf_space_used

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The token is supposed to cache the last page used by the set/get
helpers. In leaf_space_used the first and last items are accessed, it's
not likely they'd be on the same page so there's some overhead caused
updating the token address but not using it.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-04-29 22:56:01 +02:00
parent 60d48e2e45
commit a31356b9e2
1 changed files with 3 additions and 5 deletions
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8
fs/btrfs/ctree.c
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@ -3507,19 +3507,17 @@ static int leaf_space_used(struct extent_buffer *l, int start, int nr)
{
struct btrfs_item *start_item;
struct btrfs_item *end_item;
struct btrfs_map_token token;
int data_len;
int nritems = btrfs_header_nritems(l);
int end = min(nritems, start + nr) - 1;
if (!nr)
return 0;
btrfs_init_map_token(&token, l);
start_item = btrfs_item_nr(start);
end_item = btrfs_item_nr(end);
data_len = btrfs_token_item_offset(&token, start_item) +
btrfs_token_item_size(&token, start_item);
data_len = data_len - btrfs_token_item_offset(&token, end_item);
data_len = btrfs_item_offset(l, start_item) +
btrfs_item_size(l, start_item);
data_len = data_len - btrfs_item_offset(l, end_item);
data_len += sizeof(struct btrfs_item) * nr;
WARN_ON(data_len < 0);
return data_len;