[PATCH 1/2] xfs: adjust the incore perag block_count when shrinking

Darrick J. Wong
2023-10-09T18:25:54Z

From: Darrick J. Wong <djwong@kernel.org>

If we reduce the number of blocks in an AG, we must update the incore
geometry values as well.

Fixes: 0800169e3e2c9 ("xfs: Pre-calculate per-AG agbno geometry")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_ag.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index e9cc481b4ddff..f9f4d694640d0 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -1001,6 +1001,12 @@ xfs_ag_shrink_space(
error = -ENOSPC;
goto resv_init_out;
}
+
+ /* Update perag geometry */
+ pag->block_count -= delta;
+ __xfs_agino_range(pag->pag_mount, pag->block_count, &pag->agino_min,
+ &pag->agino_max);
+
xfs_ialloc_log_agi(*tpp, agibp, XFS_AGI_LENGTH);
xfs_alloc_log_agf(*tpp, agfbp, XFS_AGF_LENGTH);
return 0;