Btrfs: use delayed ref sequence numbers for all fs-tree updates

The sequence number for delayed refs is needed to postpone certain delayed
refs for a very short period while walking backrefs. Before the tree
modification log, we thought we'd only have to hold back those references
that don't have a counter operation.

While now we've the tree mod log, we're rewinding fs tree blocks to a
defined consistent state. We cannot know in advance for which tree block
we'll be doing rewind operations later. Therefore, we must postpone all the
delayed refs for fs-tree blocks, even those having a counter operation.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 6ba21b1..f5f11a6 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3121,4 +3121,11 @@ void btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
                            struct seq_list *elem);
 
+static inline int is_fstree(u64 rootid)
+{
+       if (rootid == BTRFS_FS_TREE_OBJECTID ||
+           (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
+               return 1;
+       return 0;
+}
 #endif

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 69f22e3..13ae7b0 100644 (file)
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -525,7 +525,7 @@ static noinline void add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
        ref->is_head = 0;
        ref->in_tree = 1;
 
-       if (need_ref_seq(for_cow, ref_root))
+       if (is_fstree(ref_root))
                seq = inc_delayed_seq(delayed_refs);
        ref->seq = seq;
 
@@ -584,7 +584,7 @@ static noinline void add_delayed_data_ref(struct btrfs_fs_info *fs_info,
        ref->is_head = 0;
        ref->in_tree = 1;
 
-       if (need_ref_seq(for_cow, ref_root))
+       if (is_fstree(ref_root))
                seq = inc_delayed_seq(delayed_refs);
        ref->seq = seq;
 
@@ -658,10 +658,11 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
        add_delayed_tree_ref(fs_info, trans, &ref->node, bytenr,
                                   num_bytes, parent, ref_root, level, action,
                                   for_cow);
-       if (!need_ref_seq(for_cow, ref_root) &&
+       if (!is_fstree(ref_root) &&
            waitqueue_active(&delayed_refs->seq_wait))
                wake_up(&delayed_refs->seq_wait);
        spin_unlock(&delayed_refs->lock);
+
        return 0;
 }
 
@@ -706,10 +707,11 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
        add_delayed_data_ref(fs_info, trans, &ref->node, bytenr,
                                   num_bytes, parent, ref_root, owner, offset,
                                   action, for_cow);
-       if (!need_ref_seq(for_cow, ref_root) &&
+       if (!is_fstree(ref_root) &&
            waitqueue_active(&delayed_refs->seq_wait))
                wake_up(&delayed_refs->seq_wait);
        spin_unlock(&delayed_refs->lock);
+
        return 0;
 }
 

diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index fd82446..413927f 100644 (file)
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -225,25 +225,6 @@ int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
                            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.
  */