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XArray: Fix xas_reload for multi-index entries 

xas_reload() was only checking that the head entry was still at the
head index.  If the entry has been split, that's not enough as there
may be a different entry at the specified index now.

Solve this by checking the slot for the requested index instead of the
head index.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-08-02 14:17:21 -04:00
parent f82cd2f0b5
commit ca7b639e86
1 changed files with 14 additions and 3 deletions
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17
include/linux/xarray.h
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@ -1524,10 +1524,21 @@ void xas_create_range(struct xa_state *);
static inline void *xas_reload(struct xa_state *xas)
{
struct xa_node *node = xas->xa_node;
void *entry;
char offset;
if (node)
return xa_entry(xas->xa, node, xas->xa_offset);
return xa_head(xas->xa);
if (!node)
return xa_head(xas->xa);
if (IS_ENABLED(CONFIG_XARRAY_MULTI)) {
offset = (xas->xa_index >> node->shift) & XA_CHUNK_MASK;
entry = xa_entry(xas->xa, node, offset);
if (!xa_is_sibling(entry))
return entry;
offset = xa_to_sibling(entry);
} else {
offset = xas->xa_offset;
}
return xa_entry(xas->xa, node, offset);
}
/**