diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 69023b8fc67a..2b0f8408917b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3515,9 +3515,12 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
 		struct dnode_of_data dn;
 		pgoff_t end_offset, count;
 
+		f2fs_lock_op(sbi);
+
 		set_new_dnode(&dn, inode, NULL, NULL, 0);
 		ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
 		if (ret) {
+			f2fs_unlock_op(sbi);
 			if (ret == -ENOENT) {
 				page_idx = f2fs_get_next_page_offset(&dn,
 								page_idx);
@@ -3535,6 +3538,8 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
 
 		f2fs_put_dnode(&dn);
 
+		f2fs_unlock_op(sbi);
+
 		if (ret < 0)
 			break;
 
@@ -3687,9 +3692,12 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 		struct dnode_of_data dn;
 		pgoff_t end_offset, count;
 
+		f2fs_lock_op(sbi);
+
 		set_new_dnode(&dn, inode, NULL, NULL, 0);
 		ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
 		if (ret) {
+			f2fs_unlock_op(sbi);
 			if (ret == -ENOENT) {
 				page_idx = f2fs_get_next_page_offset(&dn,
 								page_idx);
@@ -3707,6 +3715,8 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 
 		f2fs_put_dnode(&dn);
 
+		f2fs_unlock_op(sbi);
+
 		if (ret < 0)
 			break;