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authorJosef Bacik <jbacik@fusionio.com>2013-02-13 20:09:14 +0400
committerJosef Bacik <jbacik@fusionio.com>2013-02-20 21:59:57 +0400
commit569e0f358c0c37f6733702d4a5d2c412860f7169 (patch)
tree8ab0ece9bd2716da66a43406628f6f5176604817 /fs/btrfs/transaction.h
parentdde5740fdd6175fc95aecf4ccc7856fbbad9b44e (diff)
downloadlinux-569e0f358c0c37f6733702d4a5d2c412860f7169.tar.xz
Btrfs: place ordered operations on a per transaction list
Miao made the ordered operations stuff run async, which introduced a deadlock where we could get somebody (sync) racing in and committing the transaction while a commit was already happening. The new committer would try and flush ordered operations which would hang waiting for the commit to finish because it is done asynchronously and no longer inherits the callers trans handle. To fix this we need to make the ordered operations list a per transaction list. We can get new inodes added to the ordered operation list by truncating them and then having another process writing to them, so this makes it so that anybody trying to add an ordered operation _must_ start a transaction in order to add itself to the list, which will keep new inodes from getting added to the ordered operations list after we start committing. This should fix the deadlock and also keeps us from doing a lot more work than we need to during commit. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/transaction.h')
-rw-r--r--fs/btrfs/transaction.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 46628210e5d8..3f772fd0191a 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -43,6 +43,7 @@ struct btrfs_transaction {
wait_queue_head_t writer_wait;
wait_queue_head_t commit_wait;
struct list_head pending_snapshots;
+ struct list_head ordered_operations;
struct btrfs_delayed_ref_root delayed_refs;
int aborted;
};