gfs2: Defer deleting inodes under memory pressure
When under memory pressure and an inode's link count has dropped to zero, defer deleting the inode to the delete workqueue. This avoids calling into DLM under memory pressure, which can deadlock. Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com> Signed-off-by: NBob Peterson <rpeterso@redhat.com>
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