[XFS] Restore the lowspace extent allocator algorithm

When free space is running low the extent allocator may choose to allocate
an extent from an AG without leaving sufficient space for a btree split
when inserting the new extent (see where xfs_bmap_btalloc() sets minleft
to 0). In this case the allocator will enable the lowspace algorithm which
is supposed to allow further allocations (such as btree splits and
newroots) to allocate from sequential AGs. This algorithm has been broken
for a long time and this patch restores its behaviour.

SGI-PV: 983338

SGI-Modid: xfs-linux-melb:xfs-kern:31358a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c
index 3fc09cd8d517..1140cef4ba99 100644
--- a/fs/xfs/xfs_bmap_btree.c
+++ b/fs/xfs/xfs_bmap_btree.c
@@ -1509,7 +1509,9 @@ xfs_bmbt_split(
                  * block allocation here and corrupt the filesystem.
                  */
                 args.minleft = xfs_trans_get_block_res(args.tp);
-        } else
+        } else if (cur->bc_private.b.flist->xbf_low)
+                args.type = XFS_ALLOCTYPE_START_BNO;
+        else
                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
         args.mod = args.alignment = args.total = args.isfl =
                 args.userdata = args.minalignslop = 0;
@@ -2237,7 +2239,9 @@ xfs_bmbt_newroot(
 #endif
                 args.fsbno = be64_to_cpu(*pp);
                 args.type = XFS_ALLOCTYPE_START_BNO;
-        } else
+        } else if (cur->bc_private.b.flist->xbf_low)
+                args.type = XFS_ALLOCTYPE_START_BNO;
+        else
                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
         if ((error = xfs_alloc_vextent(&args))) {
                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);