Btrfs: Fix the defragmention code and the block relocation code for data=ordered

Before setting an extent to delalloc, the code needs to wait for
pending ordered extents.

Also, the relocation code needs to wait for ordered IO before scanning
the block group again.  This is because the extents are not removed
until the IO for the new extents is finished

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7ce3f83c5dd6..ec01062eb41d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1252,6 +1252,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         fs_info->btree_inode->i_nlink = 1;
         fs_info->thread_pool_size = min(num_online_cpus() + 2, 8);
 
+        INIT_LIST_HEAD(&fs_info->ordered_extents);
+        spin_lock_init(&fs_info->ordered_extent_lock);
+
         sb->s_blocksize = 4096;
         sb->s_blocksize_bits = blksize_bits(4096);