diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index b8cbc8d5c7f7cb39ed770fb2b256427f25bb9c69..85ae2b6fe03b73fe09258b4cf80e20695231a810 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -266,9 +266,9 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
 	em->mod_start = em->start;
 	em->mod_len = em->len;
 
-	if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
+	if (test_bit(EXTENT_FLAG_FILLING, &em->flags)) {
 		prealloc = true;
-		clear_bit(EXTENT_FLAG_PREALLOC, &em->flags);
+		clear_bit(EXTENT_FLAG_FILLING, &em->flags);
 	}
 
 	try_merge_map(tree, em);
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 99a0dcb5ba2f2a38edd74e02efd886d3b3083482..922943ce29e8caebe0a69feda2a7e481bed0d556 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -14,6 +14,7 @@
 #define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
 #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
 #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
+#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
 
 struct extent_map {
 	struct rb_node rb_node;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index bfd59bcc50d761f5a1568cd69f166760ffcb74f8..73e6833dcc21e3e76707ac5afa640e372f41ab7f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1327,7 +1327,7 @@ static noinline int run_delalloc_nocow(struct inode *inode,
 			em->orig_block_len = disk_num_bytes;
 			em->bdev = root->fs_info->fs_devices->latest_bdev;
 			set_bit(EXTENT_FLAG_PINNED, &em->flags);
-			set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
+			set_bit(EXTENT_FLAG_FILLING, &em->flags);
 			while (1) {
 				write_lock(&em_tree->lock);
 				ret = add_extent_mapping(em_tree, em);
@@ -5945,7 +5945,7 @@ static struct extent_map *create_pinned_em(struct inode *inode, u64 start,
 	em->orig_block_len = orig_block_len;
 	set_bit(EXTENT_FLAG_PINNED, &em->flags);
 	if (type == BTRFS_ORDERED_PREALLOC)
-		set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
+		set_bit(EXTENT_FLAG_FILLING, &em->flags);
 
 	do {
 		btrfs_drop_extent_cache(inode, em->start,