xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach

Check if we actually need to attach a dquot before taking the ilock in
xfs_qm_dqattach.  This avoid superflous lock roundtrips for the common cases
of quota support compiled in but not activated on a filesystem and an
inode that already has the dquots attached.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Mark Tinguely <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>
Signed-off-by: Ben Myers <[email protected]>

0 files changed, 0 insertions, 0 deletions