Commit 1ac35f06 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: use the finobt block counts to speed up mount times 



Now that we have reliable finobt block counts, use them to speed up the
per-AG block reservation calculations at mount time.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
parent 2a39946c

fs/xfs/libxfs/xfs_ialloc_btree.c

+27 −1
Original line number Diff line number Diff line
@@ -694,6 +694,28 @@ xfs_inobt_count_blocks( 
	return error;

}



/* Read finobt block count from AGI header. */

static int

xfs_finobt_read_blocks(

	struct xfs_mount	*mp,

	struct xfs_trans	*tp,

	xfs_agnumber_t		agno,

	xfs_extlen_t		*tree_blocks)

{

	struct xfs_buf		*agbp;

	struct xfs_agi		*agi;

	int			error;



	error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);

	if (error)

		return error;



	agi = agbp->b_addr;

	*tree_blocks = be32_to_cpu(agi->agi_fblocks);

	xfs_trans_brelse(tp, agbp);

	return 0;

}



/*

 * Figure out how many blocks to reserve and how many are used by this btree.

 */
@@ -711,7 +733,11 @@ xfs_finobt_calc_reserves( 
	if (!xfs_sb_version_hasfinobt(&mp->m_sb))

		return 0;



	error = xfs_inobt_count_blocks(mp, tp, agno, XFS_BTNUM_FINO, &tree_len);

	if (xfs_sb_version_hasinobtcounts(&mp->m_sb))

		error = xfs_finobt_read_blocks(mp, tp, agno, &tree_len);

	else

		error = xfs_inobt_count_blocks(mp, tp, agno, XFS_BTNUM_FINO,

				&tree_len);

	if (error)

		return error;

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