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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: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-08-26 10:54:27 -07:00
parent 2a39946c98
commit 1ac35f061a
1 changed files with 27 additions and 1 deletions
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28
fs/xfs/libxfs/xfs_ialloc_btree.c
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@ -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;