[PATCH 07/20] xfs: realtime rmap btree transaction reservations

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

Make sure that there's enough log reservation to handle mapping
and unmapping realtime extents.  We have to reserve enough space
to handle a split in the rtrmapbt to add the record and a second
split in the regular rmapbt to record the rtrmapbt split.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_trans_resv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c
index b456cca..f9771b7 100644
--- a/fs/xfs/libxfs/xfs_trans_resv.c
+++ b/fs/xfs/libxfs/xfs_trans_resv.c
@@ -83,7 +83,8 @@ xfs_allocfree_log_count(
 
        blocks = num_ops * 2 * (2 * mp->m_ag_maxlevels - 1);
        if (xfs_sb_version_hasrmapbt(&mp->m_sb))
-               blocks += num_ops * (2 * mp->m_rmap_maxlevels - 1);
+               blocks += max(num_ops * (2 * mp->m_rmap_maxlevels - 1),
+                             num_ops * (2 * mp->m_rtrmap_maxlevels - 1));
        if (xfs_sb_version_hasreflink(&mp->m_sb))
                blocks += num_ops * (2 * mp->m_refc_maxlevels - 1);