dax: Don't access a freed inode
After we drop the i_pages lock, the inode can be freed at any time. The get_unlocked_entry() code has no choice but to reacquire the lock, so it can't be used here. Create a new wait_entry_unlocked() which takes care not to acquire the lock or dereference the address_space in any way. Fixes: c2a7d2a1 ("filesystem-dax: Introduce dax_lock_mapping_entry()") Cc: <stable@vger.kernel.org> Signed-off-by: NMatthew Wilcox <willy@infradead.org> Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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