[Cluster-devel] [PATCH] gfs2: Convert function bh_get to use iomap

[Andreas Gruenbacher <agruenba@redhat.com>]

On Fri, Feb 11, 2022 at 4:51 PM Bob Peterson <rpeterso@redhat.com> wrote:
> Before this patch, function bh_get used block_map to figure out the
> block it needed to read in from the quota_change file. This patch
> changes it to use iomap directly to make it more efficient.

Thanks, I've applied this with minor cleanups.

There are still a few other users of gfs2_block_map around that should
be converted as well.

Andreas

> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
> ---
>  fs/gfs2/quota.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
> index dc77080a82bb..91bc3affe460 100644
> --- a/fs/gfs2/quota.c
> +++ b/fs/gfs2/quota.c
> @@ -368,8 +368,8 @@ static int bh_get(struct gfs2_quota_data *qd)
>         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
>         unsigned int block, offset;
>         struct buffer_head *bh;
> +       struct iomap iomap = { };
>         int error;
> -       struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
>
>         mutex_lock(&sdp->sd_quota_mutex);
>
> @@ -381,11 +381,18 @@ static int bh_get(struct gfs2_quota_data *qd)
>         block = qd->qd_slot / sdp->sd_qc_per_block;
>         offset = qd->qd_slot % sdp->sd_qc_per_block;
>
> -       bh_map.b_size = BIT(ip->i_inode.i_blkbits);
> -       error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
> +       error = gfs2_iomap_get(sdp->sd_qc_inode,
> +                              (loff_t)block << sdp->sd_qc_inode->i_blkbits,
> +                              sdp->sd_sb.sb_bsize, &iomap);
>         if (error)
>                 goto fail;
> -       error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
> +       if (iomap.addr == IOMAP_NULL_ADDR) {
> +               error = -ENOENT;
> +               goto fail;
> +       }
> +
> +       error = gfs2_meta_read(ip->i_gl, iomap.addr >> sdp->sd_qc_inode->i_blkbits,
> +                              DIO_WAIT, 0, &bh);
>         if (error)
>                 goto fail;
>         error = -EIO;
> --
> 2.34.1
>