xfs: remove SYNC_BDFLUSH

SYNC_BDFLUSH is a leftover from IRIX and rather misnamed for todays
code.  Make xfs_sync_fsdata and xfs_dq_sync use the SYNC_TRYLOCK flag
for not blocking on logs just as the inode sync code already does.

For xfs_sync_fsdata it's a trivial 1:1 replacement, but for xfs_qm_sync
I use the opportunity to decouple the non-blocking lock case from the
different flushing modes, similar to the inode sync code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>

diff --cc fs/xfs/linux-2.6/xfs_sync.c
Simple merge

diff --cc fs/xfs/linux-2.6/xfs_sync.h
Simple merge

diff --cc fs/xfs/quota/xfs_qm.c
Simple merge