Commit 1330edbe authored Nov 06, 2013 by Bob Peterson Committed by Steven Whitehouse Jan 03, 2014

GFS2: Drop inadequate rgrps from the reservation tree

This is just basically a resend of a patch I posted earlier.
It didn't change from its original, except in diff offsets, etc:

This patch fixes a bug in the GFS2 block allocation code. The problem
starts if a process already has a multi-block reservation, but for
some reason, another process disqualifies it from further allocations.
For example, the other process might set on the GFS2_RDF_ERROR bit.
The process holding the reservation jumps to label skip_rgrp, but
that label comes after the code that removes the reservation from the
tree. Therefore, the no longer usable reservation is not removed from
the rgrp's reservations tree; it's lost. Eventually, the lost reservation
causes the count of reserved blocks to get off, and eventually that
causes a BUG_ON(rs->rs_rbm.rgd->rd_reserved < rs->rs_free) to trigger.
This patch moves the call to after label skip_rgrp so that the
disqualified reservation is properly removed from the tree, thus keeping
the rgrp rd_reserved count sane.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

parent 5ce13431

fs/gfs2/rgrp.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -1944,15 +1944,16 @@ int gfs2_inplace_reserve(struct gfs2_inode ip, const struct gfs2_alloc_parms a
		return 0;
		}

		/* Drop reservation, if we couldn't use reserved rgrp */
		if (gfs2_rs_active(rs))
		gfs2_rs_deltree(rs);
		check_rgrp:
		/* Check for unlinked inodes which can be reclaimed */
		if (rs->rs_rbm.rgd->rd_flags & GFS2_RDF_CHECK)
		try_rgrp_unlink(rs->rs_rbm.rgd, &last_unlinked,
		ip->i_no_addr);
		skip_rgrp:
		/* Drop reservation, if we couldn't use reserved rgrp */
		if (gfs2_rs_active(rs))
		gfs2_rs_deltree(rs);

		/* Unlock rgrp if required */
		if (!rg_locked)
		gfs2_glock_dq_uninit(&rs->rs_rgd_gh);