[PATCH v3 4/4] xfs: refactor successful AG allocation accounting code

[Brian Foster <bfoster@redhat.com>]

The higher level allocation code is unnecessarily split across
xfs_alloc_ag_vextent() and xfs_alloc_ag_vextent_type(). In
preparation for condensing this code, factor out the AG accounting
bits and move the caller down after the generic allocation structure
and function definitions to pick them up without the need for
declarations. No functional changes.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_alloc.c | 75 +++++++++++++++++++++++----------------
 1 file changed, 45 insertions(+), 30 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index d550aa5597bf..4ae4cfa0ed7f 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -1364,6 +1364,48 @@ xfs_alloc_ag_vextent_near(
 	return error;
 }
 
+/*
+ * Various AG accounting updates for a successful allocation. This includes
+ * updating the rmapbt, AG free block accounting and AG reservation accounting.
+ */
+STATIC int
+xfs_alloc_ag_vextent_accounting(
+	struct xfs_alloc_arg	*args)
+{
+	int			error = 0;
+
+	ASSERT(args->agbno != NULLAGBLOCK);
+	ASSERT(args->len >= args->minlen);
+	ASSERT(args->len <= args->maxlen);
+	ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL);
+	ASSERT(args->agbno % args->alignment == 0);
+
+	/* if not file data, insert new block into the reverse map btree */
+	if (!xfs_rmap_should_skip_owner_update(&args->oinfo)) {
+		error = xfs_rmap_alloc(args->tp, args->agbp, args->agno,
+				       args->agbno, args->len, &args->oinfo);
+		if (error)
+			return error;
+	}
+
+	if (!args->wasfromfl) {
+		error = xfs_alloc_update_counters(args->tp, args->pag,
+						  args->agbp,
+						  -((long)(args->len)));
+		if (error)
+			return error;
+
+		ASSERT(!xfs_extent_busy_search(args->mp, args->agno,
+					      args->agbno, args->len));
+	}
+
+	xfs_ag_resv_alloc_extent(args->pag, args->resv, args);
+
+	XFS_STATS_INC(args->mp, xs_allocx);
+	XFS_STATS_ADD(args->mp, xs_allocb, args->len);
+	return error;
+}
+
 /*
  * Allocate a variable extent in the allocation group agno.
  * Type and bno are used to determine where in the allocation group the
@@ -1402,38 +1444,11 @@ xfs_alloc_ag_vextent(
 		ASSERT(0);
 		/* NOTREACHED */
 	}
-
-	if (error || args->agbno == NULLAGBLOCK)
+	if (error)
 		return error;
 
-	ASSERT(args->len >= args->minlen);
-	ASSERT(args->len <= args->maxlen);
-	ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL);
-	ASSERT(args->agbno % args->alignment == 0);
-
-	/* if not file data, insert new block into the reverse map btree */
-	if (!xfs_rmap_should_skip_owner_update(&args->oinfo)) {
-		error = xfs_rmap_alloc(args->tp, args->agbp, args->agno,
-				       args->agbno, args->len, &args->oinfo);
-		if (error)
-			return error;
-	}
-
-	if (!args->wasfromfl) {
-		error = xfs_alloc_update_counters(args->tp, args->pag,
-						  args->agbp,
-						  -((long)(args->len)));
-		if (error)
-			return error;
-
-		ASSERT(!xfs_extent_busy_search(args->mp, args->agno,
-					      args->agbno, args->len));
-	}
-
-	xfs_ag_resv_alloc_extent(args->pag, args->resv, args);
-
-	XFS_STATS_INC(args->mp, xs_allocx);
-	XFS_STATS_ADD(args->mp, xs_allocb, args->len);
+	if (args->agbno != NULLAGBLOCK)
+		error = xfs_alloc_ag_vextent_accounting(args);
 	return error;
 }
 
-- 
2.20.1