BTRFS_STAT_CURR
extents_delta = ctl->discardable_extents[BTRFS_STAT_CURR] -
ctl->discardable_extents[BTRFS_STAT_CURR];
bytes_delta = ctl->discardable_bytes[BTRFS_STAT_CURR] -
ctl->discardable_bytes[BTRFS_STAT_CURR];
ctl->discardable_extents[BTRFS_STAT_CURR]--;
ctl->discardable_bytes[BTRFS_STAT_CURR] -= info->bytes;
ctl->discardable_extents[BTRFS_STAT_CURR]++;
ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
ctl->discardable_bytes[BTRFS_STAT_CURR] += bytes;
ctl->discardable_extents[BTRFS_STAT_CURR] -=
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bitmap_info->bytes;
ctl->discardable_extents[BTRFS_STAT_CURR] +=
ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
ctl->discardable_extents[BTRFS_STAT_CURR]--;
ctl->discardable_bytes[BTRFS_STAT_CURR] -=
ctl->discardable_extents[BTRFS_STAT_CURR]++;
ctl->discardable_bytes[BTRFS_STAT_CURR] +=
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
ctl->discardable_extents[BTRFS_STAT_CURR]--;
ctl->discardable_extents[BTRFS_STAT_CURR] +=
ctl->discardable_bytes[BTRFS_STAT_CURR] += entry->bytes;
ctl->discardable_extents[BTRFS_STAT_CURR] -=
ctl->discardable_bytes[BTRFS_STAT_CURR] -= entry->bytes;