btrfs: pull up qgroup checks from delayed-ref core to init time

Instead of checking whether qgroup processing for a dealyed ref has to
happen in the core of delayed ref, simply pull the check at init time of
respective delayed ref structures. This eliminates the final use of
real_root in delayed-ref core paving the way to making this member
optional.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -921,8 +921,6 @@ int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
 	}
 
 	if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
-	    is_fstree(generic_ref->real_root) &&
-	    is_fstree(generic_ref->tree_ref.owning_root) &&
 	    !generic_ref->skip_qgroup) {
 		record = kzalloc(sizeof(*record), GFP_NOFS);
 		if (!record) {
@@ -1027,8 +1025,6 @@ int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
 	}
 
 	if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
-	    is_fstree(ref_root) &&
-	    is_fstree(generic_ref->real_root) &&
 	    !generic_ref->skip_qgroup) {
 		record = kzalloc(sizeof(*record), GFP_NOFS);
 		if (!record) {

fs/btrfs/delayed-ref.h

@@ -279,6 +279,12 @@ static inline void btrfs_init_tree_ref(struct btrfs_ref *generic_ref,
 	generic_ref->tree_ref.level = level;
 	generic_ref->tree_ref.owning_root = root;
 	generic_ref->type = BTRFS_REF_METADATA;
+	if (skip_qgroup || !(is_fstree(root) &&
+			     (!mod_root || is_fstree(mod_root))))
+		generic_ref->skip_qgroup = true;
+	else
+		generic_ref->skip_qgroup = false;
+
 }
 
 static inline void btrfs_init_data_ref(struct btrfs_ref *generic_ref,
@@ -292,6 +298,11 @@ static inline void btrfs_init_data_ref(struct btrfs_ref *generic_ref,
 	generic_ref->data_ref.ino = ino;
 	generic_ref->data_ref.offset = offset;
 	generic_ref->type = BTRFS_REF_DATA;
+	if (skip_qgroup || !(is_fstree(ref_root) &&
+			     (!mod_root || is_fstree(mod_root))))
+		generic_ref->skip_qgroup = true;
+	else
+		generic_ref->skip_qgroup = false;
 }
 
 static inline struct btrfs_delayed_extent_op *

fs/btrfs/extent-tree.c

@@ -2437,11 +2437,9 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
 			key.offset -= btrfs_file_extent_offset(buf, fi);
 			btrfs_init_generic_ref(&generic_ref, action, bytenr,
 					       num_bytes, parent);
-			generic_ref.real_root = root->root_key.objectid;
 			btrfs_init_data_ref(&generic_ref, ref_root, key.objectid,
 					    key.offset, root->root_key.objectid,
 					    for_reloc);
-			generic_ref.skip_qgroup = for_reloc;
 			if (inc)
 				ret = btrfs_inc_extent_ref(trans, &generic_ref);
 			else
@@ -2453,10 +2451,8 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
 			num_bytes = fs_info->nodesize;
 			btrfs_init_generic_ref(&generic_ref, action, bytenr,
 					       num_bytes, parent);
-			generic_ref.real_root = root->root_key.objectid;
 			btrfs_init_tree_ref(&generic_ref, level - 1, ref_root,
 					    root->root_key.objectid, for_reloc);
-			generic_ref.skip_qgroup = for_reloc;
 			if (inc)
 				ret = btrfs_inc_extent_ref(trans, &generic_ref);
 			else
@@ -4936,7 +4932,6 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
 
 		btrfs_init_generic_ref(&generic_ref, BTRFS_ADD_DELAYED_EXTENT,
 				       ins.objectid, ins.offset, parent);
-		generic_ref.real_root = root->root_key.objectid;
 		btrfs_init_tree_ref(&generic_ref, level, root_objectid,
 				    root->root_key.objectid, false);
 		btrfs_ref_tree_mod(fs_info, &generic_ref);

fs/btrfs/inode.c

@@ -4919,7 +4919,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 
 			btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF,
 					extent_start, extent_num_bytes, 0);
-			ref.real_root = root->root_key.objectid;
 			btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
 					ino, extent_offset,
 					root->root_key.objectid, false);

fs/btrfs/relocation.c

@@ -1146,7 +1146,6 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
 		key.offset -= btrfs_file_extent_offset(leaf, fi);
 		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
 				       num_bytes, parent);
-		ref.real_root = root->root_key.objectid;
 		btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
 				    key.objectid, key.offset,
 				    root->root_key.objectid, false);
@@ -1158,7 +1157,6 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
 
 		btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, bytenr,
 				       num_bytes, parent);
-		ref.real_root = root->root_key.objectid;
 		btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
 				    key.objectid, key.offset,
 				    root->root_key.objectid, false);
@@ -1370,7 +1368,6 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
 
 		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr,
 				       blocksize, path->nodes[level]->start);
-		ref.skip_qgroup = true;
 		btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid,
 				    0, true);
 		ret = btrfs_inc_extent_ref(trans, &ref);
@@ -1380,7 +1377,6 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
 		}
 		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
 				       blocksize, 0);
-		ref.skip_qgroup = true;
 		btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid, 0,
 				    true);
 		ret = btrfs_inc_extent_ref(trans, &ref);
@@ -1393,7 +1389,6 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
 				       blocksize, path->nodes[level]->start);
 		btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid,
 				    0, true);
-		ref.skip_qgroup = true;
 		ret = btrfs_free_extent(trans, &ref);
 		if (ret) {
 			btrfs_abort_transaction(trans, ret);
@@ -1404,7 +1399,6 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
 				       blocksize, 0);
 		btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid,
 				    0, true);
-		ref.skip_qgroup = true;
 		ret = btrfs_free_extent(trans, &ref);
 		if (ret) {
 			btrfs_abort_transaction(trans, ret);
@@ -2480,7 +2474,6 @@ static int do_relocation(struct btrfs_trans_handle *trans,
 			btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF,
 					       node->eb->start, blocksize,
 					       upper->eb->start);
-			ref.real_root = root->root_key.objectid;
 			btrfs_init_tree_ref(&ref, node->level,
 					    btrfs_header_owner(upper->eb),
 					    root->root_key.objectid, false);