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radix-tree: add support for multi-order iterating

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This enables the macros radix_tree_for_each_slot() and friends to be
used with multi-order entries.

The way that this works is that we treat all entries in a given slots[]
array as a single chunk.  If the index given to radix_tree_next_chunk()
happens to point us to a sibling entry, we will back up iter->index so
that it points to the canonical entry, and that will be the place where
we start our iteration.

As we're processing a chunk in radix_tree_next_slot(), we process
canonical entries, skip over sibling entries, and restart the chunk
lookup if we find a non-sibling indirect pointer.  This drops back to
the radix_tree_next_chunk() code, which will re-walk the tree and look
for another chunk.

This allows us to properly handle multi-order entries mixed with other
entries that are at various heights in the radix tree.

Signed-off-by: Ross Zwisler <[email protected]>
Signed-off-by: Matthew Wilcox <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Kirill Shutemov <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ross Zwisler 2016-05-20 17:02:26 -07:00 • committed by Linus Torvalds
commit 21ef533931
4 changed files with 102 additions and 41 deletions
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3
tools/testing/radix-tree/generated/autoconf.h Normal file
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@ -0,0 +1,3 @@
#define CONFIG_RADIX_TREE_MULTIORDER 1
#define CONFIG_SHMEM 1
#define CONFIG_SWAP 1

5
tools/testing/radix-tree/linux/kernel.h
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@ -8,10 +8,7 @@
#include <limits.h>
#include "../../include/linux/compiler.h"
#define CONFIG_RADIX_TREE_MULTIORDER
#define CONFIG_SHMEM
#define CONFIG_SWAP
#include "../../../include/linux/kconfig.h"
#define RADIX_TREE_MAP_SHIFT 3