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Commit 313b5c76 authored by Lachlan McIlroy's avatar Lachlan McIlroy Committed by Niv Sardi
Browse files

[XFS] Allow xfs_bmbt_split() to fallback to the lowspace allocator 


algorithm

If xfs_bmbt_split() cannot find an AG with sufficient free space to
satisfy a full extent btree split then fall back to the lowspace allocator
algorithm.

SGI-PV: 983338

SGI-Modid: xfs-linux-melb:xfs-kern:31359a

Signed-off-by: default avatarLachlan McIlroy <lachlan@sgi.com>
Signed-off-by: default avatarDavid Chinner <dgc@sgi.com>
parent b877e3d3

fs/xfs/xfs_bmap_btree.c

+15 −0
Original line number Diff line number Diff line
@@ -1525,6 +1525,21 @@ xfs_bmbt_split( 
		XFS_BMBT_TRACE_CURSOR(cur, ERROR);

		return error;

	}

	if (args.fsbno == NULLFSBLOCK && args.minleft) {

		/*

		 * Could not find an AG with enough free space to satisfy

		 * a full btree split.  Try again without minleft and if

		 * successful activate the lowspace algorithm.

		 */

		args.fsbno = 0;

		args.type = XFS_ALLOCTYPE_FIRST_AG;

		args.minleft = 0;

		if ((error = xfs_alloc_vextent(&args))) {

			XFS_BMBT_TRACE_CURSOR(cur, ERROR);

			return error;

		}

		cur->bc_private.b.flist->xbf_low = 1;

	}

	if (args.fsbno == NULLFSBLOCK) {

		XFS_BMBT_TRACE_CURSOR(cur, EXIT);

		*stat = 0;