Btrfs: Remove offset field from struct btrfs_extent_ref
The offset field in struct btrfs_extent_ref records the position
inside file that file extent is referenced by. In the new back
reference system, tree leaves holding references to file extent
are recorded explicitly. We can scan these tree leaves very quickly, so the
offset field is not required.
This patch also makes the back reference system check the objectid
when extents are in deleting.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 8df719a..cf618cc 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -460,8 +460,7 @@
ins.objectid, ins.offset,
path->nodes[0]->start,
root->root_key.objectid,
- trans->transid,
- key->objectid, key->offset);
+ trans->transid, key->objectid);
} else {
/*
* insert the extent pointer in the extent
@@ -471,7 +470,7 @@
path->nodes[0]->start,
root->root_key.objectid,
trans->transid, key->objectid,
- key->offset, &ins);
+ &ins);
BUG_ON(ret);
}
}
@@ -2534,8 +2533,7 @@
dst_path->nodes[0]->start,
BTRFS_TREE_LOG_OBJECTID,
trans->transid,
- ins_keys[i].objectid,
- ins_keys[i].offset);
+ ins_keys[i].objectid);
BUG_ON(ret);
}
}