btrfs: use temporary variable for space_info in btrfs_update_block_group

We do

  cache->space_info->counter += num_bytes;

everywhere in here.  This is makes the lines longer than they need to
be, and will be especially noticeable when we add the active tracking in,
so add a temp variable for the space_info so this is cleaner.

Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 0ef8b89..1a31bcd 100644 (file)
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -3476,6 +3476,7 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
        spin_unlock(&info->delalloc_root_lock);
 
        while (total) {
+               struct btrfs_space_info *space_info;
                bool reclaim = false;
 
                cache = btrfs_lookup_block_group(info, bytenr);
@@ -3483,6 +3484,7 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
                        ret = -ENOENT;
                        break;
                }
+               space_info = cache->space_info;
                factor = btrfs_bg_type_to_factor(cache->flags);
 
                /*
@@ -3497,7 +3499,7 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
                byte_in_group = bytenr - cache->start;
                WARN_ON(byte_in_group > cache->length);
 
-               spin_lock(&cache->space_info->lock);
+               spin_lock(&space_info->lock);
                spin_lock(&cache->lock);
 
                if (btrfs_test_opt(info, SPACE_CACHE) &&
@@ -3510,24 +3512,24 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
                        old_val += num_bytes;
                        cache->used = old_val;
                        cache->reserved -= num_bytes;
-                       cache->space_info->bytes_reserved -= num_bytes;
-                       cache->space_info->bytes_used += num_bytes;
-                       cache->space_info->disk_used += num_bytes * factor;
+                       space_info->bytes_reserved -= num_bytes;
+                       space_info->bytes_used += num_bytes;
+                       space_info->disk_used += num_bytes * factor;
                        spin_unlock(&cache->lock);
-                       spin_unlock(&cache->space_info->lock);
+                       spin_unlock(&space_info->lock);
                } else {
                        old_val -= num_bytes;
                        cache->used = old_val;
                        cache->pinned += num_bytes;
-                       btrfs_space_info_update_bytes_pinned(info,
-                                       cache->space_info, num_bytes);
-                       cache->space_info->bytes_used -= num_bytes;
-                       cache->space_info->disk_used -= num_bytes * factor;
+                       btrfs_space_info_update_bytes_pinned(info, space_info,
+                                                            num_bytes);
+                       space_info->bytes_used -= num_bytes;
+                       space_info->disk_used -= num_bytes * factor;
 
                        reclaim = should_reclaim_block_group(cache, num_bytes);
 
                        spin_unlock(&cache->lock);
-                       spin_unlock(&cache->space_info->lock);
+                       spin_unlock(&space_info->lock);
 
                        set_extent_dirty(&trans->transaction->pinned_extents,
                                         bytenr, bytenr + num_bytes - 1,