Btrfs: handle running extent ops with skinny metadata

Chris hit a bug where we weren't finding extent records when running extent ops.
This is because we use the delayed_ref_head when running the extent op, which
means we can't use the ->type checks to see if we are metadata.  We also lose
the level of the metadata we are working on.  So to fix this we can just check
the ->is_data section of the extent_op, and we can store the level of the buffer
we were modifying in the extent_op.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

4 files changed, 12 insertions, 10 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index de6de8e60b46..02fae7f7e42c 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -951,10 +951,12 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
                         BUG_ON(ret); /* -ENOMEM */
                 }
                 if (new_flags != 0) {
+                        int level = btrfs_header_level(buf);
+
                         ret = btrfs_set_disk_extent_flags(trans, root,
                                                           buf->start,
                                                           buf->len,
-                                                          new_flags, 0);
+                                                          new_flags, level, 0);
                         if (ret)
                                 return ret;
                 }
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2720d5555883..d6dd49b51ba8 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3075,7 +3075,7 @@ int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root,
                                 u64 bytenr, u64 num_bytes, u64 flags,
-                                int is_data);
+                                int level, int is_data);
 int btrfs_free_extent(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index f75fcaf79aeb..70b962cc177d 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -60,6 +60,7 @@ struct btrfs_delayed_ref_node {
 struct btrfs_delayed_extent_op {
         struct btrfs_disk_key key;
         u64 flags_to_set;
+        int level;
         unsigned int update_key:1;
         unsigned int update_flags:1;
         unsigned int is_data:1;
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2305b5c5cf00..c4c94b30c729 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2070,8 +2070,7 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
         u32 item_size;
         int ret;
         int err = 0;
-        int metadata = (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
-                        node->type == BTRFS_SHARED_BLOCK_REF_KEY);
+        int metadata = !extent_op->is_data;
 
         if (trans->aborted)
                 return 0;
@@ -2086,11 +2085,8 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
         key.objectid = node->bytenr;
 
         if (metadata) {
-                struct btrfs_delayed_tree_ref *tree_ref;
-
-                tree_ref = btrfs_delayed_node_to_tree_ref(node);
                 key.type = BTRFS_METADATA_ITEM_KEY;
-                key.offset = tree_ref->level;
+                key.offset = extent_op->level;
         } else {
                 key.type = BTRFS_EXTENT_ITEM_KEY;
                 key.offset = node->num_bytes;
@@ -2719,7 +2715,7 @@ out:
 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root,
                                 u64 bytenr, u64 num_bytes, u64 flags,
-                                int is_data)
+                                int level, int is_data)
 {
         struct btrfs_delayed_extent_op *extent_op;
         int ret;
@@ -2732,6 +2728,7 @@ int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
         extent_op->update_flags = 1;
         extent_op->update_key = 0;
         extent_op->is_data = is_data ? 1 : 0;
+        extent_op->level = level;
 
         ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr,
                                           num_bytes, extent_op);
@@ -6763,6 +6760,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                         extent_op->update_key = 1;
                 extent_op->update_flags = 1;
                 extent_op->is_data = 0;
+                extent_op->level = level;
 
                 ret = btrfs_add_delayed_tree_ref(root->fs_info, trans,
                                         ins.objectid,
@@ -6934,7 +6932,8 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
                 ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc);
                 BUG_ON(ret); /* -ENOMEM */
                 ret = btrfs_set_disk_extent_flags(trans, root, eb->start,
-                                                  eb->len, flag, 0);
+                                                  eb->len, flag,
+                                                  btrfs_header_level(eb), 0);
                 BUG_ON(ret); /* -ENOMEM */
                 wc->flags[level] |= flag;
         }