Matthew Wilcox (Oracle) 19c30f4dd0 XArray: Fix xa_find_after with multi-index entries ...

If the entry is of an order which is a multiple of XA_CHUNK_SIZE,
the current detection of sibling entries does not work.  Factor out
an xas_sibling() function to make xa_find_after() a little more
understandable, and write a new implementation that doesn't suffer from
the same bug.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: stable@vger.kernel.org

2020-01-17 22:33:27 -05:00

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