erofs: remove unused tag argument while finding a workgroup

It is feasible to simplify erofs_find_workgroup() interface by removing
an unused function argument. While formally the argument is used in the
function itself, its assigned value is ignored on the caller side.
Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com>
Link: https://lore.kernel.org/r/20200102120118.14979-2-vladimir@tuxera.comReviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>

fs/erofs/internal.h

@@ -401,7 +401,7 @@ static inline void *erofs_get_pcpubuf(unsigned int pagenr)
 #ifdef CONFIG_EROFS_FS_ZIP
 int erofs_workgroup_put(struct erofs_workgroup *grp);
 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
-					     pgoff_t index, bool *tag);
+					     pgoff_t index);
 int erofs_register_workgroup(struct super_block *sb,
 			     struct erofs_workgroup *grp, bool tag);
 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp);

fs/erofs/utils.c

@@ -59,7 +59,7 @@ static int erofs_workgroup_get(struct erofs_workgroup *grp)
 }
 
 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
-					     pgoff_t index, bool *tag)
+					     pgoff_t index)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(sb);
 	struct erofs_workgroup *grp;
@@ -68,7 +68,6 @@ struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
 	rcu_read_lock();
 	grp = radix_tree_lookup(&sbi->workstn_tree, index);
 	if (grp) {
-		*tag = xa_pointer_tag(grp);
 		grp = xa_untag_pointer(grp);
 
 		if (erofs_workgroup_get(grp)) {

fs/erofs/zdata.c

@@ -345,9 +345,8 @@ static int z_erofs_lookup_collection(struct z_erofs_collector *clt,
 	struct z_erofs_pcluster *pcl;
 	struct z_erofs_collection *cl;
 	unsigned int length;
-	bool tag;
 
-	grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT, &tag);
+	grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT);
 	if (!grp)
 		return -ENOENT;