Btrfs: Start btree concurrency work.

[people/arne_f/kernel.git] / fs / btrfs / transaction.c

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f04684f7fea33aa4a6227afe74f3cb6ce34e515a..1ed433a7149333621042f1af917efa10e09c3dea 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -23,6 +23,7 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
+#include "locking.h"
 
 static int total_trans = 0;
 extern struct kmem_cache *btrfs_trans_handle_cachep;
@@ -96,8 +97,7 @@ static noinline int record_root_in_trans(struct btrfs_root *root)
                        radix_tree_tag_set(&root->fs_info->fs_roots_radix,
                                   (unsigned long)root->root_key.objectid,
                                   BTRFS_ROOT_DEFRAG_TAG);
-                       root->commit_root = root->node;
-                       extent_buffer_get(root->node);
+                       root->commit_root = btrfs_root_node(root);
                } else {
                        WARN_ON(1);
                }
@@ -559,6 +559,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
        struct btrfs_root *tree_root = fs_info->tree_root;
        struct btrfs_root *root = pending->root;
        struct extent_buffer *tmp;
+       struct extent_buffer *old;
        int ret;
        int namelen;
        u64 objectid;
@@ -578,16 +579,18 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
        key.offset = 1;
        btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
 
-       extent_buffer_get(root->node);
-       btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
-       free_extent_buffer(tmp);
+       old = btrfs_lock_root_node(root);
+       btrfs_cow_block(trans, root, old, NULL, 0, &old);
 
-       btrfs_copy_root(trans, root, root->node, &tmp, objectid);
+       btrfs_copy_root(trans, root, old, &tmp, objectid);
+       btrfs_tree_unlock(old);
+       free_extent_buffer(old);
 
        btrfs_set_root_bytenr(new_root_item, tmp->start);
        btrfs_set_root_level(new_root_item, btrfs_header_level(tmp));
        ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
                                new_root_item);
+       btrfs_tree_unlock(tmp);
        free_extent_buffer(tmp);
        if (ret)
                goto fail;