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btrfs: assert delayed ref lock in btrfs_find_delayed_ref_head

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Turn the comment about required lock into an assertion.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-03-27 16:19:55 +01:00
parent 93ead46b03
commit 38e9372e39
1 changed files with 4 additions and 3 deletions
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7
fs/btrfs/delayed-ref.c
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@ -957,13 +957,14 @@ int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
}
/*
* this does a simple search for the head node for a given extent.
* It must be called with the delayed ref spinlock held, and it returns
* the head node if any where found, or NULL if not.
* This does a simple search for the head node for a given extent. Returns the
* head node if found, or NULL if not.
*/
struct btrfs_delayed_ref_head *
btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
{
lockdep_assert_held(&delayed_refs->lock);
return find_ref_head(delayed_refs, bytenr, false);
}