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Diffstat (limited to 'fs/xfs/libxfs/xfs_refcount_btree.c')
-rw-r--r--fs/xfs/libxfs/xfs_refcount_btree.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c
index 6f47ab876d90..5d9de9b21726 100644
--- a/fs/xfs/libxfs/xfs_refcount_btree.c
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -427,6 +427,15 @@ xfs_refcountbt_calc_reserves(
tree_len = be32_to_cpu(agf->agf_refcount_blocks);
xfs_trans_brelse(tp, agbp);
+ /*
+ * The log is permanently allocated, so the space it occupies will
+ * never be available for the kinds of things that would require btree
+ * expansion. We therefore can pretend the space isn't there.
+ */
+ if (mp->m_sb.sb_logstart &&
+ XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno)
+ agblocks -= mp->m_sb.sb_logblocks;
+
*ask += xfs_refcountbt_max_size(mp, agblocks);
*used += tree_len;