On Thu, Feb 11, 2016 at 08:40:58AM +1100, Dave Chinner wrote: > I run into that from time to time (maybe once a month) on a vanilla > kernel. > > IIRC, the problem is the delayed allocation extent split runs out of > it's reserved block count if you split it enough times. The case > I've seen is that the indlen calculated in xfs_bmap_worst_indlen() > ends up too small for a subsequent allocation after we've called > xfs_bmap_del_extent() to delete the middle of a delalloc extent too > many times. > > Brian had some patches that attempted to solve it - we may have > simply dropped the ball on this (again). > > http://oss.sgi.com/archives/xfs/2014-09/msg00337.html I'm pretty sure that is a separate issue. With the refcount btree we may allocate an extent (or rather just a single block) in xfs_alloc_ag_vextent as called from xfs_refcountbt_alloc_block. The reservation helps us to ensure this block is always available, but we still need to account for that in xfs_trans_reserve(), which we currently don't do for itruncate transactions. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
