3 files changed, 27 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_ialloc_btree.c b/fs/xfs/libxfs/xfs_ialloc_btree.c
index 1080381ff243..bc2dfacd2f4a 100644
--- a/fs/xfs/libxfs/xfs_ialloc_btree.c
+++ b/fs/xfs/libxfs/xfs_ialloc_btree.c
@@ -549,6 +549,15 @@ xfs_inobt_max_size(
         if (mp->m_inobt_mxr[0] == 0)
                 return 0;
 
+        /*
+         * 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;
+
         return xfs_btree_calc_size(mp->m_inobt_mnr,
                                 (uint64_t)agblocks * mp->m_sb.sb_inopblock /
                                         XFS_INODES_PER_CHUNK);
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;
 
diff --git a/fs/xfs/libxfs/xfs_rmap_btree.c b/fs/xfs/libxfs/xfs_rmap_btree.c
index 5738e11055e6..5d1f8884c888 100644
--- a/fs/xfs/libxfs/xfs_rmap_btree.c
+++ b/fs/xfs/libxfs/xfs_rmap_btree.c
@@ -578,6 +578,15 @@ xfs_rmapbt_calc_reserves(
         tree_len = be32_to_cpu(agf->agf_rmap_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;
+
         /* Reserve 1% of the AG or enough for 1 block per record. */
         *ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks));
         *used += tree_len;