[XFS] Allow xfs_bmbt_split() to fallback to the lowspace allocator (313b5c76) · Commits · 戴 / test

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:

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

David Chinner <dgc@sgi.com>

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;

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