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Message-Id: <1469493335-3622-7-git-send-email-kirill.shutemov@linux.intel.com>
Date: Tue, 26 Jul 2016 03:35:08 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: "Theodore Ts'o" <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Jan Kara <jack@...e.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
Hugh Dickins <hughd@...gle.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Dave Hansen <dave.hansen@...el.com>,
Vlastimil Babka <vbabka@...e.cz>,
Matthew Wilcox <willy@...radead.org>,
Ross Zwisler <ross.zwisler@...ux.intel.com>,
linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-block@...r.kernel.org,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv1, RFC 06/33] radix-tree: Handle multiorder entries being deleted by replace_clear_tags
From: Matthew Wilcox <willy@...radead.org>
radix_tree_replace_clear_tags() can be called with NULL as the replacement
value; in this case we need to delete sibling entries which point to
the slot.
Signed-off-by: Matthew Wilcox <willy@...radead.org>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
lib/radix-tree.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e49f32f7c537..89092c4011b8 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1799,17 +1799,23 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_delete);
+/*
+ * If the caller passes NULL for @entry, it must take care to adjust
+ * node->count. See page_cache_tree_delete() for an example.
+ */
struct radix_tree_node *radix_tree_replace_clear_tags(
struct radix_tree_root *root,
unsigned long index, void *entry)
{
struct radix_tree_node *node;
void **slot;
+ unsigned int offset;
__radix_tree_lookup(root, index, &node, &slot);
if (node) {
- unsigned int tag, offset = get_slot_offset(node, slot);
+ unsigned int tag;
+ offset = get_slot_offset(node, slot);
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
node_tag_clear(root, node, tag, offset);
} else {
@@ -1818,6 +1824,9 @@ struct radix_tree_node *radix_tree_replace_clear_tags(
}
radix_tree_replace_slot(slot, entry);
+ if (!entry && node)
+ delete_sibling_entries(node, node_to_entry(slot), offset);
+
return node;
}
--
2.8.1
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