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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-03-31 15:27:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:24:09 +0300 |
| commit | 7aae60df6782971606567ed4f23239390cfdf0a7 (patch) | |
| tree | 35f6447d2b43eceb41a1e5e67b3c8237a43849be /lib | |
| parent | be8ebbabac944f01f6fabb026df060ca84c69d3c (diff) | |
| download | linux-7aae60df6782971606567ed4f23239390cfdf0a7.tar.xz | |
XArray: Update the LRU list in xas_split()
commit 3ed4bb77156da0bc732847c8c9df92454c1fbeea upstream.
When splitting a value entry, we may need to add the new nodes to the LRU
list and remove the parent node from the LRU list. The WARN_ON checks
in shadow_lru_isolate() catch this oversight. This bug was latent
until we stopped splitting folios in shrink_page_list() with commit
820c4e2e6f51 ("mm/vmscan: Free non-shmem folios without splitting them").
That allows the creation of large shadow entries, and subsequently when
trying to page in a small page, we will split the large shadow entry
in __filemap_add_folio().
Fixes: 8fc75643c5e1 ("XArray: add xas_split")
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/xarray.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/xarray.c b/lib/xarray.c index 26ee3b284f48..96e2d7748e5a 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1081,6 +1081,7 @@ void xas_split(struct xa_state *xas, void *entry, unsigned int order) xa_mk_node(child)); if (xa_is_value(curr)) values--; + xas_update(xas, child); } else { unsigned int canon = offset - xas->xa_sibs; @@ -1095,6 +1096,7 @@ void xas_split(struct xa_state *xas, void *entry, unsigned int order) } while (offset-- > xas->xa_offset); node->nr_values += values; + xas_update(xas, node); } EXPORT_SYMBOL_GPL(xas_split); #endif |