1 files changed, 7 insertions, 5 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index a54d354cefcb..c71abec0ab90 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -128,12 +128,14 @@ struct btrfs_inode {
         u64 last_unlink_trans;
 
         /*
-         * These two counters are for delalloc metadata reservations.  We keep
-         * track of how many extents we've accounted for vs how many extents we
-         * have.
+         * Counters to keep track of the number of extent item's we may use due
+         * to delalloc and such.  outstanding_extents is the number of extent
+         * items we think we'll end up using, and reserved_extents is the number
+         * of extent items we've reserved metadata for.
          */
-        int delalloc_reserved_extents;
-        int delalloc_extents;
+        spinlock_t accounting_lock;
+        int reserved_extents;
+        int outstanding_extents;
 
         /*
          * ordered_data_close is set by truncate when a file that used