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XArray: Add xas_advance()

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Add a new helper function to help iterate over multi-index entries.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle)
2021-08-27 07:21:49 -04:00
parent b9a8a4195c
commit 25a8de7f8d
2 changed files with 21 additions and 3 deletions
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6
lib/xarray.c
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@@ -157,7 +157,7 @@ static void xas_move_index(struct xa_state *xas, unsigned long offset)
xas->xa_index += offset << shift;
}
static void xas_advance(struct xa_state *xas)
static void xas_next_offset(struct xa_state *xas)
{
xas->xa_offset++;
xas_move_index(xas, xas->xa_offset);
@@ -1250,7 +1250,7 @@ void *xas_find(struct xa_state *xas, unsigned long max)
xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
}
xas_advance(xas);
xas_next_offset(xas);
while (xas->xa_node && (xas->xa_index <= max)) {
if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
@@ -1268,7 +1268,7 @@ void *xas_find(struct xa_state *xas, unsigned long max)
if (entry && !xa_is_sibling(entry))
return entry;
xas_advance(xas);
xas_next_offset(xas);
}
if (!xas->xa_node)