On Fri, Feb 17, 2017 at 05:17:36PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Implement a query_range function for the bnobt and cntbt. This will
> be used for getfsmap fallback if there is no rmapbt and by the online
> scrub and repair code.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> fs/xfs/libxfs/xfs_alloc.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> fs/xfs/libxfs/xfs_alloc.h | 10 ++++++++++
> 2 files changed, 52 insertions(+)
>
>
> diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> index 9f06a21..526df17 100644
> --- a/fs/xfs/libxfs/xfs_alloc.c
> +++ b/fs/xfs/libxfs/xfs_alloc.c
> @@ -2875,3 +2875,45 @@ xfs_free_extent(
> xfs_trans_brelse(tp, agbp);
> return error;
> }
> +
> +struct xfs_alloc_query_range_info {
> + xfs_alloc_query_range_fn fn;
> + void *priv;
> +};
> +
> +/* Format btree record and pass to our callback. */
> +STATIC int
> +xfs_alloc_query_range_helper(
> + struct xfs_btree_cur *cur,
> + union xfs_btree_rec *rec,
> + void *priv)
> +{
> + struct xfs_alloc_query_range_info *query = priv;
> + struct xfs_alloc_rec_incore irec;
> +
> + irec.ar_startblock = be32_to_cpu(rec->alloc.ar_startblock);
> + irec.ar_blockcount = be32_to_cpu(rec->alloc.ar_blockcount);
> + return query->fn(cur, &irec, query->priv);
> +}
> +
> +/* Find all free space within a given range of blocks. */
> +int
> +xfs_alloc_query_range(
> + struct xfs_btree_cur *cur,
> + struct xfs_alloc_rec_incore *low_rec,
> + struct xfs_alloc_rec_incore *high_rec,
> + xfs_alloc_query_range_fn fn,
> + void *priv)
> +{
> + union xfs_btree_irec low_brec;
> + union xfs_btree_irec high_brec;
> + struct xfs_alloc_query_range_info query;
> +
> + ASSERT(cur->bc_btnum == XFS_BTNUM_BNO);
> + low_brec.a = *low_rec;
> + high_brec.a = *high_rec;
> + query.priv = priv;
> + query.fn = fn;
> + return xfs_btree_query_range(cur, &low_brec, &high_brec,
> + xfs_alloc_query_range_helper, &query);
> +}
> diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
> index 1d0f48a..f534998 100644
> --- a/fs/xfs/libxfs/xfs_alloc.h
> +++ b/fs/xfs/libxfs/xfs_alloc.h
> @@ -223,4 +223,14 @@ int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
>
> xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
>
> +typedef int (*xfs_alloc_query_range_fn)(
> + struct xfs_btree_cur *cur,
> + struct xfs_alloc_rec_incore *rec,
> + void *priv);
> +
> +int xfs_alloc_query_range(struct xfs_btree_cur *cur,
> + struct xfs_alloc_rec_incore *low_rec,
> + struct xfs_alloc_rec_incore *high_rec,
> + xfs_alloc_query_range_fn fn, void *priv);
> +
> #endif /* __XFS_ALLOC_H__ */
>
> --
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