[PATCH 3/4] xfs: defered work could create precommits

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

To fix a AGI-AGF-inode cluster buffer deadlock, we need to move
inode cluster buffer oeprations to the ->iop_precommit() method.
However, this means that deferred operations can require precommits
to be run on the final transaction that the deferred ops pass back
to xfs_trans_commit() context. This will be exposed by attribute
handling, in that the last changes to the inode in the attr set
state machine "disappear" because the precommit operation is not run.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_trans.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 8afc0c080861..664084509af5 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -970,6 +970,11 @@ __xfs_trans_commit(
 		error = xfs_defer_finish_noroll(&tp);
 		if (error)
 			goto out_unreserve;
+
+		/* Run precomits from final tx in defer chain */
+		error = xfs_trans_run_precommits(tp);
+		if (error)
+			goto out_unreserve;
 	}
 
 	/*
-- 
2.40.1