xfs: saner xfs_trans_commit interface

The flags argument to xfs_trans_commit is not useful for most callers, as
a commit of a transaction without a permanent log reservation must pass
0 here, and all callers for a transaction with a permanent log reservation
except for xfs_trans_roll must pass XFS_TRANS_RELEASE_LOG_RES.  So remove
the flags argument from the public xfs_trans_commit interfaces, and
introduce low-level __xfs_trans_commit variant just for xfs_trans_roll
that regrants a log reservation instead of releasing it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 3f3f8a0..63cd400 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1230,7 +1230,7 @@
 	if (error)
 		goto out_bmap_cancel;
 
-	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	error = xfs_trans_commit(tp);
 	if (error)
 		goto out_release_inode;
 
@@ -1339,7 +1339,7 @@
 	if (error)
 		goto out_trans_cancel;
 
-	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	error = xfs_trans_commit(tp);
 	if (error)
 		goto out_release_inode;
 
@@ -1465,7 +1465,7 @@
 		goto error_return;
 	}
 
-	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	return xfs_trans_commit(tp);
 
  error_return:
 	xfs_trans_cancel(tp);
@@ -1702,7 +1702,7 @@
 
 	ASSERT(ip->i_d.di_nextents == 0);
 
-	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	error = xfs_trans_commit(tp);
 	if (error)
 		goto error_unlock;
 
@@ -1799,7 +1799,7 @@
 	if (error)
 		xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
 			__func__, error);
-	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	error = xfs_trans_commit(tp);
 	if (error)
 		xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
 			__func__, error);
@@ -2569,7 +2569,7 @@
 	if (error)
 		goto out_bmap_cancel;
 
-	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	error = xfs_trans_commit(tp);
 	if (error)
 		goto std_return;
 
@@ -2659,7 +2659,7 @@
 		return error;
 	}
 
-	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+	return xfs_trans_commit(tp);
 }
 
 /*