Commit 7ae2ea7d authored Nov 09, 2018 by Matthew Wilcox

dax: Make sure the unlocking entry isn't locked

I wrote the semantics in the commit message, but didn't document it in
the source code. Use a BUG_ON instead (if any code does do this, it's
really buggy; we can't recover and it's worth taking the machine down).

Signed-off-by: Matthew Wilcox <willy@infradead.org>

parent 6d7cd8c1

fs/dax.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -255,6 +255,7 @@ static void dax_unlock_entry(struct xa_state xas, void entry)
		{
		void *old;

		BUG_ON(dax_is_locked(entry));
		xas_reset(xas);
		xas_lock_irq(xas);
		old = xas_store(xas, entry);