Re: [PATCH 2/2] Btrfs: don't iterate mod seq list when putting a tree mod seq

[Josef Bacik <josef@toxicpanda.com>]

On 1/22/20 7:23 AM, fdmanana@kernel.org wrote:
> From: Filipe Manana <fdmanana@suse.com>
> 
> Each new element added to the mod seq list is always appended to the list,
> and each one gets a sequence number coming from a counter which gets
> incremented everytime a new element is added to the list (or a new node
> is added to the tree mod log rbtree). Therefore the element with the
> lowest sequence number is always the first element in the list.
> 
> So just remove the list iteration at btrfs_put_tree_mod_seq() that
> computes the minimum sequence number in the list and replace it with
> a check for the first element's sequence number.
> 
> Signed-off-by: Filipe Manana <fdmanana@suse.com>

This looks like a prime place for list_first_entry_or_null, but I'm not married 
to it

Reviewed-by: Josef Bacik <josef@toxicpanda.com>

Thanks,

Josef