tree 939b10227537908c96bb339a1655a0c25413057b
parent 5ee0844d6427e7338e0aba748f62b62d07ea2ed0
author Josef Bacik <jbacik@fusionio.com> 1345834383 -0600
committer Chris Mason <chris.mason@oracle.com> 1346187220 -0400

Btrfs: fix deadlock with freeze and sync V2

We can deadlock with freeze right now because we unconditionally start a
transaction in our ->sync_fs() call.  To fix this just check and see if we
have a running transaction to commit.  This saves us from the deadlock
because at this point we'll have the umount sem for the sb so we're safe
from freezes coming in after we've done our check.  With this patch the
freeze xfstests no longer deadlocks.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>