xfs: factor out tree fixup logic into helper

Lift the btree fixup path into a helper function.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_alloc.c

@@ -890,6 +890,36 @@ xfs_alloc_cur_check(
 	return 0;
 }
 
+/*
+ * Complete an allocation of a candidate extent. Remove the extent from both
+ * trees and update the args structure.
+ */
+STATIC int
+xfs_alloc_cur_finish(
+	struct xfs_alloc_arg	*args,
+	struct xfs_alloc_cur	*acur)
+{
+	int			error;
+
+	ASSERT(acur->cnt && acur->bnolt);
+	ASSERT(acur->bno >= acur->rec_bno);
+	ASSERT(acur->bno + acur->len <= acur->rec_bno + acur->rec_len);
+	ASSERT(acur->rec_bno + acur->rec_len <=
+	       be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length));
+
+	error = xfs_alloc_fixup_trees(acur->cnt, acur->bnolt, acur->rec_bno,
+				      acur->rec_len, acur->bno, acur->len, 0);
+	if (error)
+		return error;
+
+	args->agbno = acur->bno;
+	args->len = acur->len;
+	args->wasfromfl = 0;
+
+	trace_xfs_alloc_cur(args);
+	return 0;
+}
+
 /*
  * Deal with the case where only small freespaces remain. Either return the
  * contents of the last freespace record, or allocate space from the freelist if
@@ -1359,7 +1389,6 @@ xfs_alloc_ag_vextent_near(
 	} else if (error) {
 		goto out;
 	}
-	args->wasfromfl = 0;
 
 	/*
 	 * First algorithm.
@@ -1440,15 +1469,8 @@ xfs_alloc_ag_vextent_near(
 	}
 
 alloc:
-	args->agbno = acur.bno;
-	args->len = acur.len;
-	ASSERT(acur.bno >= acur.rec_bno);
-	ASSERT(acur.bno + acur.len <= acur.rec_bno + acur.rec_len);
-	ASSERT(acur.rec_bno + acur.rec_len <=
-	       be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length));
-
-	error = xfs_alloc_fixup_trees(acur.cnt, acur.bnolt, acur.rec_bno,
-				      acur.rec_len, acur.bno, acur.len, 0);
+	/* fix up btrees on a successful allocation */
+	error = xfs_alloc_cur_finish(args, &acur);
 
 out:
 	xfs_alloc_cur_close(&acur, error);

fs/xfs/xfs_trace.h

@@ -1577,6 +1577,7 @@ DEFINE_ALLOC_EVENT(xfs_alloc_exact_notfound);
 DEFINE_ALLOC_EVENT(xfs_alloc_exact_error);
 DEFINE_ALLOC_EVENT(xfs_alloc_near_nominleft);
 DEFINE_ALLOC_EVENT(xfs_alloc_near_first);
+DEFINE_ALLOC_EVENT(xfs_alloc_cur);
 DEFINE_ALLOC_EVENT(xfs_alloc_cur_right);
 DEFINE_ALLOC_EVENT(xfs_alloc_cur_left);
 DEFINE_ALLOC_EVENT(xfs_alloc_near_error);