Btrfs: make sure logged extents complete in the current transaction V3

Liu Bo pointed out that my previous fix would lose the generation update in the
scenario I described.  It is actually much worse than that, we could lose the
entire extent if we lose power right after the transaction commits.  Consider
the following

write extent 0-4k
log extent in log tree
commit transaction
	< power fail happens here
ordered extent completes

We would lose the 0-4k extent because it hasn't updated the actual fs tree, and
the transaction commit will reset the log so it isn't replayed.  If we lose
power before the transaction commit we are save, otherwise we are not.

Fix this by keeping track of all extents we logged in this transaction.  Then
when we go to commit the transaction make sure we wait for all of those ordered
extents to complete before proceeding.  This will make sure that if we lose
power after the transaction commit we still have our data.  This also fixes the
problem of the improperly updated extent generation.  Thanks,

cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7af9a1978a2f..6efaee8d7739 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4129,6 +4129,25 @@ again:
         return 0;
 }
 
+static void btrfs_free_pending_ordered(struct btrfs_transaction *cur_trans,
+                                       struct btrfs_fs_info *fs_info)
+{
+        struct btrfs_ordered_extent *ordered;
+
+        spin_lock(&fs_info->trans_lock);
+        while (!list_empty(&cur_trans->pending_ordered)) {
+                ordered = list_first_entry(&cur_trans->pending_ordered,
+                                           struct btrfs_ordered_extent,
+                                           trans_list);
+                list_del_init(&ordered->trans_list);
+                spin_unlock(&fs_info->trans_lock);
+
+                btrfs_put_ordered_extent(ordered);
+                spin_lock(&fs_info->trans_lock);
+        }
+        spin_unlock(&fs_info->trans_lock);
+}
+
 void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
                                    struct btrfs_root *root)
 {
@@ -4140,6 +4159,7 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
         cur_trans->state = TRANS_STATE_UNBLOCKED;
         wake_up(&root->fs_info->transaction_wait);
 
+        btrfs_free_pending_ordered(cur_trans, root->fs_info);
         btrfs_destroy_delayed_inodes(root);
         btrfs_assert_delayed_root_empty(root);