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Date: Thu, 14 Apr 2016 10:37:13 -0400
From: Matthew Wilcox <willy@...ux.intel.com>
To: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
Konstantin Khlebnikov <koct9i@...il.com>,
Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
Jan Kara <jack@...e.com>, Neil Brown <neilb@...e.de>,
Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: [PATCH 10/19] radix-tree: Rename indirect_to_ptr() to entry_to_node()
Mirrors the earlier commit introducing node_to_entry().
Also change the type returned to be a struct radix_tree_node pointer.
That lets us simplify a couple of places in the radix tree shrink & extend
paths where we could convert an entry into a pointer, modify the node, then
convert the pointer back into an entry.
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
include/linux/radix-tree.h | 12 +++++------
lib/radix-tree.c | 48 ++++++++++++++++++-----------------------
tools/testing/radix-tree/test.c | 4 ++--
tools/testing/radix-tree/test.h | 1 -
4 files changed, 28 insertions(+), 37 deletions(-)
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index c8cc879..b94aa19 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -442,7 +442,7 @@ radix_tree_chunk_size(struct radix_tree_iter *iter)
return (iter->next_index - iter->index) >> iter_shift(iter);
}
-static inline void *indirect_to_ptr(void *ptr)
+static inline struct radix_tree_node *entry_to_node(void *ptr)
{
return (void *)((unsigned long)ptr & ~RADIX_TREE_INTERNAL_NODE);
}
@@ -469,7 +469,7 @@ radix_tree_next_slot(void **slot, struct radix_tree_iter *iter, unsigned flags)
return NULL;
while (IS_ENABLED(CONFIG_RADIX_TREE_MULTIORDER) &&
radix_tree_is_indirect_ptr(slot[1])) {
- if (indirect_to_ptr(slot[1]) == canon) {
+ if (entry_to_node(slot[1]) == canon) {
iter->tags >>= 1;
iter->index = __radix_tree_iter_add(iter, 1);
slot++;
@@ -499,12 +499,10 @@ radix_tree_next_slot(void **slot, struct radix_tree_iter *iter, unsigned flags)
if (IS_ENABLED(CONFIG_RADIX_TREE_MULTIORDER) &&
radix_tree_is_indirect_ptr(*slot)) {
- if (indirect_to_ptr(*slot) == canon)
+ if (entry_to_node(*slot) == canon)
continue;
- else {
- iter->next_index = iter->index;
- break;
- }
+ iter->next_index = iter->index;
+ break;
}
if (likely(*slot))
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index f7a0cf7..675e85f 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -230,13 +230,13 @@ static void dump_node(struct radix_tree_node *node, unsigned long index)
if (is_sibling_entry(node, entry)) {
pr_debug("radix sblng %p offset %ld val %p indices %ld-%ld\n",
entry, i,
- *(void **)indirect_to_ptr(entry),
+ *(void **)entry_to_node(entry),
first, last);
} else if (!radix_tree_is_indirect_ptr(entry)) {
pr_debug("radix entry %p offset %ld indices %ld-%ld\n",
entry, i, first, last);
} else {
- dump_node(indirect_to_ptr(entry), first);
+ dump_node(entry_to_node(entry), first);
}
}
}
@@ -249,7 +249,7 @@ static void radix_tree_dump(struct radix_tree_root *root)
root->gfp_mask >> __GFP_BITS_SHIFT);
if (!radix_tree_is_indirect_ptr(root->rnode))
return;
- dump_node(indirect_to_ptr(root->rnode), 0);
+ dump_node(entry_to_node(root->rnode), 0);
}
#endif
@@ -422,7 +422,7 @@ static unsigned radix_tree_load_root(struct radix_tree_root *root,
*nodep = node;
if (likely(radix_tree_is_indirect_ptr(node))) {
- node = indirect_to_ptr(node);
+ node = entry_to_node(node);
*maxindex = node_maxindex(node);
return node->shift + RADIX_TREE_MAP_SHIFT;
}
@@ -467,11 +467,8 @@ static int radix_tree_extend(struct radix_tree_root *root,
node->offset = 0;
node->count = 1;
node->parent = NULL;
- if (radix_tree_is_indirect_ptr(slot)) {
- slot = indirect_to_ptr(slot);
- slot->parent = node;
- slot = node_to_entry(slot);
- }
+ if (radix_tree_is_indirect_ptr(slot))
+ entry_to_node(slot)->parent = node;
node->slots[0] = slot;
slot = node_to_entry(node);
rcu_assign_pointer(root->rnode, slot);
@@ -542,7 +539,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
break;
/* Go a level down */
- node = indirect_to_ptr(slot);
+ node = entry_to_node(slot);
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
offset = radix_tree_descend(node, &slot, offset);
}
@@ -645,7 +642,7 @@ void *__radix_tree_lookup(struct radix_tree_root *root, unsigned long index,
if (node == RADIX_TREE_RETRY)
goto restart;
- parent = indirect_to_ptr(node);
+ parent = entry_to_node(node);
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
offset = radix_tree_descend(parent, &node, offset);
@@ -729,7 +726,7 @@ void *radix_tree_tag_set(struct radix_tree_root *root,
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- parent = indirect_to_ptr(node);
+ parent = entry_to_node(node);
offset = radix_tree_descend(parent, &node, offset);
BUG_ON(!node);
@@ -777,7 +774,7 @@ void *radix_tree_tag_clear(struct radix_tree_root *root,
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- parent = indirect_to_ptr(node);
+ parent = entry_to_node(node);
offset = radix_tree_descend(parent, &node, offset);
}
@@ -844,7 +841,7 @@ int radix_tree_tag_get(struct radix_tree_root *root,
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- parent = indirect_to_ptr(node);
+ parent = entry_to_node(node);
offset = radix_tree_descend(parent, &node, offset);
if (!node)
@@ -904,7 +901,7 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
return NULL;
if (radix_tree_is_indirect_ptr(rnode)) {
- rnode = indirect_to_ptr(rnode);
+ rnode = entry_to_node(rnode);
} else if (rnode) {
/* Single-slot tree */
iter->index = index;
@@ -963,7 +960,7 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
if (!radix_tree_is_indirect_ptr(slot))
break;
- node = indirect_to_ptr(slot);
+ node = entry_to_node(slot);
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
}
@@ -1048,7 +1045,7 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
return 1;
}
- node = indirect_to_ptr(slot);
+ node = entry_to_node(slot);
shift -= RADIX_TREE_MAP_SHIFT;
for (;;) {
@@ -1063,7 +1060,7 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
goto next;
/* Sibling slots never have tags set on them */
if (radix_tree_is_indirect_ptr(slot)) {
- node = indirect_to_ptr(slot);
+ node = entry_to_node(slot);
shift -= RADIX_TREE_MAP_SHIFT;
continue;
}
@@ -1323,7 +1320,7 @@ static unsigned long __locate(struct radix_tree_node *slot, void *item,
}
continue;
}
- node = indirect_to_ptr(node);
+ node = entry_to_node(node);
if (is_sibling_entry(slot, node))
continue;
slot = node;
@@ -1368,7 +1365,7 @@ unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item)
break;
}
- node = indirect_to_ptr(node);
+ node = entry_to_node(node);
max_index = node_maxindex(node);
if (cur_index > max_index) {
@@ -1404,7 +1401,7 @@ static inline bool radix_tree_shrink(struct radix_tree_root *root)
if (!radix_tree_is_indirect_ptr(to_free))
break;
- to_free = indirect_to_ptr(to_free);
+ to_free = entry_to_node(to_free);
/*
* The candidate node has more than one child, or its child
@@ -1419,11 +1416,8 @@ static inline bool radix_tree_shrink(struct radix_tree_root *root)
if (!radix_tree_is_indirect_ptr(slot) && to_free->shift)
break;
- if (radix_tree_is_indirect_ptr(slot)) {
- slot = indirect_to_ptr(slot);
- slot->parent = NULL;
- slot = node_to_entry(slot);
- }
+ if (radix_tree_is_indirect_ptr(slot))
+ entry_to_node(slot)->parent = NULL;
/*
* We don't need rcu_assign_pointer(), since we are simply
@@ -1482,7 +1476,7 @@ bool __radix_tree_delete_node(struct radix_tree_root *root,
struct radix_tree_node *parent;
if (node->count) {
- if (node == indirect_to_ptr(root->rnode))
+ if (node == entry_to_node(root->rnode))
deleted |= radix_tree_shrink(root);
return deleted;
}
diff --git a/tools/testing/radix-tree/test.c b/tools/testing/radix-tree/test.c
index 3004c58..7b0bc1f 100644
--- a/tools/testing/radix-tree/test.c
+++ b/tools/testing/radix-tree/test.c
@@ -149,7 +149,7 @@ static int verify_node(struct radix_tree_node *slot, unsigned int tag,
int i;
int j;
- slot = indirect_to_ptr(slot);
+ slot = entry_to_node(slot);
/* Verify consistency at this level */
for (i = 0; i < RADIX_TREE_TAG_LONGS; i++) {
@@ -227,7 +227,7 @@ void tree_verify_min_height(struct radix_tree_root *root, int maxindex)
return;
}
- node = indirect_to_ptr(node);
+ node = entry_to_node(node);
assert(maxindex <= node_maxindex(node));
shift = node->shift;
diff --git a/tools/testing/radix-tree/test.h b/tools/testing/radix-tree/test.h
index 866c8c6..e851313 100644
--- a/tools/testing/radix-tree/test.h
+++ b/tools/testing/radix-tree/test.h
@@ -39,7 +39,6 @@ void verify_tag_consistency(struct radix_tree_root *root, unsigned int tag);
extern int nr_allocated;
/* Normally private parts of lib/radix-tree.c */
-void *indirect_to_ptr(void *ptr);
void radix_tree_dump(struct radix_tree_root *root);
int root_tag_get(struct radix_tree_root *root, unsigned int tag);
unsigned long node_maxindex(struct radix_tree_node *);
--
2.8.0.rc3
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