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XArray: Fix xa_reserve for 2-byte aligned entries

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If we reserve index 0, the next entry to be stored there might be 2-byte
aligned.  That means we have to create the root xa_node at the time of
reserving the initial entry.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2019-02-21 17:54:44 -05:00
parent 2fbe967b3e
commit 4a5c8d8989
2 changed files with 15 additions and 3 deletions
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8
lib/xarray.c
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@@ -767,10 +767,12 @@ void *xas_store(struct xa_state *xas, void *entry)
void *first, *next;
bool value = xa_is_value(entry);
if (entry)
first = xas_create(xas, !xa_is_node(entry));
else
if (entry) {
bool allow_root = !xa_is_node(entry) && !xa_is_zero(entry);
first = xas_create(xas, allow_root);
} else {
first = xas_load(xas);
}
if (xas_invalid(xas))
return first;