linux-kernel - Re: [PATCH 1/3] btrfs: cache stripe tree usage in io

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Message-ID: <CAL3q7H5wOD4fJQ2BTpeqMmscbcS6pV9UN7ThHgi_W6vF4nPrAg@mail.gmail.com>
Date: Fri, 13 Dec 2024 12:04:08 +0000
From: Filipe Manana <fdmanana@...nel.org>
To: Johannes Thumshirn <jth@...nel.org>
Cc: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Johannes Thumshirn <johannes.thjumshirn@....com>, 
	Johannes Thumshirn <johannes.thumshirn@....com>
Subject: Re: [PATCH 1/3] btrfs: cache stripe tree usage in io_geometry

On Thu, Dec 12, 2024 at 12:55 PM Johannes Thumshirn <jth@...nel.org> wrote:
>
> From: Johannes Thumshirn <johannes.thumshirn@....com>
>
> Cache the return of btrfs_need_stripe_tree_update() in struct
> btrfs_io_geometry.
>
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>

You can also mention this reduces the object size, since
btrfs_need_stripe_tree_update() is inlined and has quite some logic
there.

Reviewed-by: Filipe Manana <fdmanana@...e.com>

Looks good, thanks.


> ---
>  fs/btrfs/volumes.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 1cccaf9c2b0d5d4029440c46a4a92c7d6541d474..fa190f7108545eacf82ef2b5f1f3838d56ca683e 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -48,6 +48,7 @@ struct btrfs_io_geometry {
>         u64 raid56_full_stripe_start;
>         int max_errors;
>         enum btrfs_map_op op;
> +       bool use_rst;
>  };
>
>  const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
> @@ -6346,8 +6347,7 @@ static int set_io_stripe(struct btrfs_fs_info *fs_info, u64 logical,
>  {
>         dst->dev = map->stripes[io_geom->stripe_index].dev;
>
> -       if (io_geom->op == BTRFS_MAP_READ &&
> -           btrfs_need_stripe_tree_update(fs_info, map->type))
> +       if (io_geom->op == BTRFS_MAP_READ && io_geom->use_rst)
>                 return btrfs_get_raid_extent_offset(fs_info, logical, length,
>                                                     map->type,
>                                                     io_geom->stripe_index, dst);
> @@ -6579,6 +6579,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
>         io_geom.raid56_full_stripe_start = (u64)-1;
>         max_len = btrfs_max_io_len(map, map_offset, &io_geom);
>         *length = min_t(u64, map->chunk_len - map_offset, max_len);
> +       io_geom.use_rst = btrfs_need_stripe_tree_update(fs_info, map->type);
>
>         if (dev_replace->replace_task != current)
>                 down_read(&dev_replace->rwsem);
>
> --
> 2.43.0
>
>