Btrfs: hooks for qgroup to record delayed refs
Hooks into qgroup code to record refs and into transaction commit.
This is the main entry point for qgroup. Basically every change in
extent backrefs got accounted to the appropriate qgroups.
Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 21a7577..da7419e 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -529,8 +529,8 @@
ref->is_head = 0;
ref->in_tree = 1;
- if (is_fstree(ref_root))
- seq = btrfs_inc_tree_mod_seq(fs_info);
+ if (need_ref_seq(for_cow, ref_root))
+ seq = btrfs_get_tree_mod_seq(fs_info, &trans->delayed_ref_elem);
ref->seq = seq;
full_ref = btrfs_delayed_node_to_tree_ref(ref);
@@ -588,8 +588,8 @@
ref->is_head = 0;
ref->in_tree = 1;
- if (is_fstree(ref_root))
- seq = btrfs_inc_tree_mod_seq(fs_info);
+ if (need_ref_seq(for_cow, ref_root))
+ seq = btrfs_get_tree_mod_seq(fs_info, &trans->delayed_ref_elem);
ref->seq = seq;
full_ref = btrfs_delayed_node_to_data_ref(ref);
@@ -662,10 +662,12 @@
add_delayed_tree_ref(fs_info, trans, &ref->node, bytenr,
num_bytes, parent, ref_root, level, action,
for_cow);
- if (!is_fstree(ref_root) &&
+ if (!need_ref_seq(for_cow, ref_root) &&
waitqueue_active(&fs_info->tree_mod_seq_wait))
wake_up(&fs_info->tree_mod_seq_wait);
spin_unlock(&delayed_refs->lock);
+ if (need_ref_seq(for_cow, ref_root))
+ btrfs_qgroup_record_ref(trans, &ref->node, extent_op);
return 0;
}
@@ -711,10 +713,12 @@
add_delayed_data_ref(fs_info, trans, &ref->node, bytenr,
num_bytes, parent, ref_root, owner, offset,
action, for_cow);
- if (!is_fstree(ref_root) &&
+ if (!need_ref_seq(for_cow, ref_root) &&
waitqueue_active(&fs_info->tree_mod_seq_wait))
wake_up(&fs_info->tree_mod_seq_wait);
spin_unlock(&delayed_refs->lock);
+ if (need_ref_seq(for_cow, ref_root))
+ btrfs_qgroup_record_ref(trans, &ref->node, extent_op);
return 0;
}
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 2b5cb27..0d7c90c 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -180,6 +180,25 @@
u64 seq);
/*
+ * delayed refs with a ref_seq > 0 must be held back during backref walking.
+ * this only applies to items in one of the fs-trees. for_cow items never need
+ * to be held back, so they won't get a ref_seq number.
+ */
+static inline int need_ref_seq(int for_cow, u64 rootid)
+{
+ if (for_cow)
+ return 0;
+
+ if (rootid == BTRFS_FS_TREE_OBJECTID)
+ return 1;
+
+ if ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
+ return 1;
+
+ return 0;
+}
+
+/*
* a node might live in a head or a regular ref, this lets you
* test for the proper type to use.
*/
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index d20d2e2..21c768c 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -795,6 +795,13 @@
ret = btrfs_run_dev_stats(trans, root->fs_info);
BUG_ON(ret);
+ ret = btrfs_run_qgroups(trans, root->fs_info);
+ BUG_ON(ret);
+
+ /* run_qgroups might have added some more refs */
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
+
while (!list_empty(&fs_info->dirty_cowonly_roots)) {
next = fs_info->dirty_cowonly_roots.next;
list_del_init(next);