xfs: refactor xfs_trans_reserve() interface

With the new xfs_trans_res structure has been introduced, the log
reservation size, log count as well as log flags are pre-initialized
at mount time.  So it's time to refine xfs_trans_reserve() interface
to be more neat.

Also, introduce a new helper M_RES() to return a pointer to the
mp->m_resv structure to simplify the input.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/xfs/xfs_trans_resv.h b/fs/xfs/xfs_trans_resv.h
index b8d5666990fe..140d3f367284 100644
--- a/fs/xfs/xfs_trans_resv.h
+++ b/fs/xfs/xfs_trans_resv.h
@@ -65,6 +65,9 @@ struct xfs_trans_resv {
         struct xfs_trans_res    tr_fsyncts;     /* update timestamps on fsync */
 };
 
+/* shorthand way of accessing reservation structure */
+#define M_RES(mp)       (&(mp)->m_resv)
+
 /*
  * Per-extent log reservation for the allocation btree changes
  * involved in freeing or allocating an extent.