btrfs: Refactor update_space_info

Following the factoring out of the creation code udpate_space_info can
only be called for already-existing space_info structs. As such it
cannot fail.  Remove superfluous error handling and make the function
return void.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4e88df0..4689b88 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3972,7 +3972,7 @@ static int create_space_info(struct btrfs_fs_info *info, u64 flags,
        return ret;
 }
 
-static int update_space_info(struct btrfs_fs_info *info, u64 flags,
+static void update_space_info(struct btrfs_fs_info *info, u64 flags,
                             u64 total_bytes, u64 bytes_used,
                             u64 bytes_readonly,
                             struct btrfs_space_info **space_info)
@@ -3987,21 +3987,19 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
                factor = 1;
 
        found = __find_space_info(info, flags);
-       if (found) {
-               spin_lock(&found->lock);
-               found->total_bytes += total_bytes;
-               found->disk_total += total_bytes * factor;
-               found->bytes_used += bytes_used;
-               found->disk_used += bytes_used * factor;
-               found->bytes_readonly += bytes_readonly;
-               if (total_bytes > 0)
-                       found->full = 0;
-               space_info_add_new_bytes(info, found, total_bytes -
-                                        bytes_used - bytes_readonly);
-               spin_unlock(&found->lock);
-               *space_info = found;
-               return 0;
-       }
+       ASSERT(found);
+       spin_lock(&found->lock);
+       found->total_bytes += total_bytes;
+       found->disk_total += total_bytes * factor;
+       found->bytes_used += bytes_used;
+       found->disk_used += bytes_used * factor;
+       found->bytes_readonly += bytes_readonly;
+       if (total_bytes > 0)
+               found->full = 0;
+       space_info_add_new_bytes(info, found, total_bytes -
+                                bytes_used - bytes_readonly);
+       spin_unlock(&found->lock);
+       *space_info = found;
 }
 
 static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
@@ -10078,19 +10076,9 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
                }
 
                trace_btrfs_add_block_group(info, cache, 0);
-               ret = update_space_info(info, cache->flags, found_key.offset,
-                                       btrfs_block_group_used(&cache->item),
-                                       cache->bytes_super, &space_info);
-               if (ret) {
-                       btrfs_remove_free_space_cache(cache);
-                       spin_lock(&info->block_group_cache_lock);
-                       rb_erase(&cache->cache_node,
-                                &info->block_group_cache_tree);
-                       RB_CLEAR_NODE(&cache->cache_node);
-                       spin_unlock(&info->block_group_cache_lock);
-                       btrfs_put_block_group(cache);
-                       goto error;
-               }
+               update_space_info(info, cache->flags, found_key.offset,
+                                 btrfs_block_group_used(&cache->item),
+                                 cache->bytes_super, &space_info);
 
                cache->space_info = space_info;
 
@@ -10249,18 +10237,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
         * the rbtree, update the space info's counters.
         */
        trace_btrfs_add_block_group(fs_info, cache, 1);
-       ret = update_space_info(fs_info, cache->flags, size, bytes_used,
+       update_space_info(fs_info, cache->flags, size, bytes_used,
                                cache->bytes_super, &cache->space_info);
-       if (ret) {
-               btrfs_remove_free_space_cache(cache);
-               spin_lock(&fs_info->block_group_cache_lock);
-               rb_erase(&cache->cache_node,
-                        &fs_info->block_group_cache_tree);
-               RB_CLEAR_NODE(&cache->cache_node);
-               spin_unlock(&fs_info->block_group_cache_lock);
-               btrfs_put_block_group(cache);
-               return ret;
-       }
        update_global_block_rsv(fs_info);
 
        __link_block_group(cache->space_info, cache);