if (args.fsbno == NULLFSBLOCK) {
args.fsbno = be64_to_cpu(start->l);
+try_another_ag:
args.type = XFS_ALLOCTYPE_START_BNO;
/*
* Make sure there is sufficient room left in the AG to
if (error)
goto error0;
+ /*
+ * During a CoW operation, the allocation and bmbt updates occur in
+ * different transactions. The mapping code tries to put new bmbt
+ * blocks near extents being mapped, but the only way to guarantee this
+ * is if the alloc and the mapping happen in a single transaction that
+ * has a block reservation. That isn't the case here, so if we run out
+ * of space we'll try again with another AG.
+ */
+ if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) &&
+ args.fsbno == NULLFSBLOCK &&
+ args.type == XFS_ALLOCTYPE_NEAR_BNO) {
+ cur->bc_private.b.dfops->dop_low = true;
+ args.fsbno = cur->bc_private.b.firstblock;
+ goto try_another_ag;
+ }
+
if (args.fsbno == NULLFSBLOCK && args.minleft) {
/*
* Could not find an AG with enough free space to satisfy
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur;
+ ASSERT(whichfork != XFS_COW_FORK);
cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);