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dax: Make sure the unlocking entry isn't locked

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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>
This commit is contained in:
Matthew Wilcox 2018-11-09 20:09:37 -05:00
parent 6d7cd8c137
commit 7ae2ea7dc4
1 changed files with 1 additions and 0 deletions
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1
fs/dax.c
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@ -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);