xfs: fix agf_fllast when repairing an empty AGFL

[platform/kernel/linux-starfive.git] / fs / xfs / scrub / agheader_repair.c

diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 6fbb31f..876a2f4 100644 (file)
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -627,7 +627,10 @@ xrep_agfl_update_agf(
        }
        agf->agf_flfirst = cpu_to_be32(0);
        agf->agf_flcount = cpu_to_be32(flcount);
-       agf->agf_fllast = cpu_to_be32(flcount - 1);
+       if (flcount)
+               agf->agf_fllast = cpu_to_be32(flcount - 1);
+       else
+               agf->agf_fllast = cpu_to_be32(xfs_agfl_size(sc->mp) - 1);
 
        xfs_alloc_log_agf(sc->tp, agf_bp,
                        XFS_AGF_FLFIRST | XFS_AGF_FLLAST | XFS_AGF_FLCOUNT);