diff options
| -rw-r--r-- | fs/btrfs/delayed-ref.c | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index bf8c2ac6c95e..6a13cf00218b 100644 --- a/fs/btrfs/delayed-ref.c +++ b/fs/btrfs/delayed-ref.c @@ -702,29 +702,33 @@ static void init_delayed_ref_head(struct btrfs_delayed_ref_head *head_ref, /* If reserved is provided, it must be a data extent. */ BUG_ON(!is_data && reserved); - /* - * The head node stores the sum of all the mods, so dropping a ref - * should drop the sum in the head node by one. - */ - if (action == BTRFS_UPDATE_DELAYED_HEAD) + switch (action) { + case BTRFS_UPDATE_DELAYED_HEAD: count_mod = 0; - else if (action == BTRFS_DROP_DELAYED_REF) + break; + case BTRFS_DROP_DELAYED_REF: + /* + * The head node stores the sum of all the mods, so dropping a ref + * should drop the sum in the head node by one. + */ count_mod = -1; - - /* - * BTRFS_ADD_DELAYED_EXTENT means that we need to update the reserved - * accounting when the extent is finally added, or if a later - * modification deletes the delayed ref without ever inserting the - * extent into the extent allocation tree. ref->must_insert_reserved - * is the flag used to record that accounting mods are required. - * - * Once we record must_insert_reserved, switch the action to - * BTRFS_ADD_DELAYED_REF because other special casing is not required. - */ - if (action == BTRFS_ADD_DELAYED_EXTENT) + break; + case BTRFS_ADD_DELAYED_EXTENT: + /* + * BTRFS_ADD_DELAYED_EXTENT means that we need to update the + * reserved accounting when the extent is finally added, or if a + * later modification deletes the delayed ref without ever + * inserting the extent into the extent allocation tree. + * ref->must_insert_reserved is the flag used to record that + * accounting mods are required. + * + * Once we record must_insert_reserved, switch the action to + * BTRFS_ADD_DELAYED_REF because other special casing is not + * required. + */ must_insert_reserved = true; - else - must_insert_reserved = false; + break; + } refcount_set(&head_ref->refs, 1); head_ref->bytenr = bytenr; |