btrfs: use explicit initializer for seq_elem

Using {} as initializer for struct seq_elem does not properly initialize
the list_head member, but it currently works because it gets set through
btrfs_get_tree_mod_seq if 'seq' is 0.

Signed-off-by: David Sterba <dsterba@suse.cz>

4 files changed, 8 insertions, 6 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index f55721ff9385..9de772ee0031 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1206,7 +1206,7 @@ int btrfs_check_shared(struct btrfs_trans_handle *trans,
         struct ulist *roots = NULL;
         struct ulist_iterator uiter;
         struct ulist_node *node;
-        struct seq_list elem = {};
+        struct seq_list elem = SEQ_LIST_INIT(elem);
         int ret = 0;
 
         tmp = ulist_alloc(GFP_NOFS);
@@ -1610,7 +1610,7 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
         struct ulist *roots = NULL;
         struct ulist_node *ref_node = NULL;
         struct ulist_node *root_node = NULL;
-        struct seq_list tree_mod_seq_elem = {};
+        struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
         struct ulist_iterator ref_uiter;
         struct ulist_iterator root_uiter;
 
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b3dd55f52f71..36e009ebab47 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1328,6 +1328,8 @@ struct seq_list {
         u64 seq;
 };
 
+#define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
+
 enum btrfs_orphan_cleanup_state {
         ORPHAN_CLEANUP_STARTED  = 1,
         ORPHAN_CLEANUP_DONE     = 2,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d49fe8a0f6b5..0a9fe214deeb 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3039,7 +3039,7 @@ out:
 static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                      u64 disko)
 {
-        struct seq_list tree_mod_seq_elem = {};
+        struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
         struct ulist *roots;
         struct ulist_iterator uiter;
         struct ulist_node *root_node = NULL;
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 97159a8e91d4..7f7eb399a347 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1845,7 +1845,7 @@ static int qgroup_shared_accounting(struct btrfs_trans_handle *trans,
         struct ulist *roots = NULL;
         struct ulist *qgroups, *tmp;
         struct btrfs_qgroup *qgroup;
-        struct seq_list elem = {};
+        struct seq_list elem = SEQ_LIST_INIT(elem);
         u64 seq;
         int old_roots = 0;
         int new_roots = 0;
@@ -1967,7 +1967,7 @@ static int qgroup_subtree_accounting(struct btrfs_trans_handle *trans,
         int err;
         struct btrfs_qgroup *qg;
         u64 root_obj = 0;
-        struct seq_list elem = {};
+        struct seq_list elem = SEQ_LIST_INIT(elem);
 
         parents = ulist_alloc(GFP_NOFS);
         if (!parents)
@@ -2522,7 +2522,7 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 {
         struct btrfs_key found;
         struct ulist *roots = NULL;
-        struct seq_list tree_mod_seq_elem = {};
+        struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
         u64 num_bytes;
         u64 seq;
         int new_roots;