[Ocfs2-devel] [PATCH 1/3] shared-du: add the rbtree source and header file to lib v4
Jie Liu
jeff.liu at oracle.com
Sun Sep 19 23:59:13 PDT 2010
* lib/rbtree.c: Source file of rbtree.
* lib/rbtree.h: Header file of rbtree.
* lib/Makefile.am (libcoreutils_a_SOURCES): Add both of them.
Signed-off-by: Jie Liu <jeff.liu at oracle.com>
---
coreutils-6.9/lib/Makefile.am | 3 +-
coreutils-6.9/lib/Makefile.in | 4 +-
coreutils-6.9/lib/rbtree.c | 403 +++++++++++++++++++++++++++++++++++++++++
coreutils-6.9/lib/rbtree.h | 143 +++++++++++++++
4 files changed, 550 insertions(+), 3 deletions(-)
create mode 100644 coreutils-6.9/lib/rbtree.c
create mode 100644 coreutils-6.9/lib/rbtree.h
diff --git a/coreutils-6.9/lib/Makefile.am b/coreutils-6.9/lib/Makefile.am
index cfa22be..6e22f65 100644
--- a/coreutils-6.9/lib/Makefile.am
+++ b/coreutils-6.9/lib/Makefile.am
@@ -26,7 +26,8 @@ LDADD = $(noinst_LIBRARIES)
libcoreutils_a_SOURCES += \
buffer-lcm.c buffer-lcm.h \
- xmemxfrm.c xmemxfrm.h
+ xmemxfrm.c xmemxfrm.h \
+ rbtree.c rbtree.h
libcoreutils_a_LIBADD += $(LIBOBJS)
libcoreutils_a_DEPENDENCIES += $(LIBOBJS)
diff --git a/coreutils-6.9/lib/Makefile.in b/coreutils-6.9/lib/Makefile.in
index 772d8f3..29a81c0 100644
--- a/coreutils-6.9/lib/Makefile.in
+++ b/coreutils-6.9/lib/Makefile.in
@@ -213,7 +213,7 @@ am_libcoreutils_a_OBJECTS = allocsa.$(OBJEXT) base64.$(OBJEXT) \
xalloc-die.$(OBJEXT) xgethostname.$(OBJEXT) xmemcoll.$(OBJEXT) \
xreadlink.$(OBJEXT) xreadlink-with-size.$(OBJEXT) \
xstrndup.$(OBJEXT) xstrtoimax.$(OBJEXT) xstrtoumax.$(OBJEXT) \
- buffer-lcm.$(OBJEXT) xmemxfrm.$(OBJEXT)
+ buffer-lcm.$(OBJEXT) xmemxfrm.$(OBJEXT) rbtree.$(OBJEXT)
libcoreutils_a_OBJECTS = $(am_libcoreutils_a_OBJECTS)
LTLIBRARIES = $(noinst_LTLIBRARIES)
PROGRAMS = $(noinst_PROGRAMS)
@@ -643,7 +643,7 @@ libcoreutils_a_SOURCES = allocsa.h allocsa.c base64.h base64.c \
xgethostname.h xgethostname.c xmemcoll.h xmemcoll.c \
xreadlink.c xreadlink-with-size.c xstrndup.h xstrndup.c \
xstrtoimax.c xstrtoumax.c buffer-lcm.c buffer-lcm.h xmemxfrm.c \
- xmemxfrm.h
+ xmemxfrm.h rbtree.c rbtree.h
libcoreutils_a_LIBADD = $(gl_LIBOBJS) @ALLOCA@ $(LIBOBJS)
libcoreutils_a_DEPENDENCIES = $(gl_LIBOBJS) @ALLOCA@ $(LIBOBJS)
EXTRA_libcoreutils_a_SOURCES = acl.c acl_entries.c file-has-acl.c \
diff --git a/coreutils-6.9/lib/rbtree.c b/coreutils-6.9/lib/rbtree.c
new file mode 100644
index 0000000..e6d1b7f
--- /dev/null
+++ b/coreutils-6.9/lib/rbtree.c
@@ -0,0 +1,403 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * kernel-rbtree.c
+ *
+ * This is imported from the Linux kernel to give us a tested and
+ * portable tree library.
+ */
+/*
+ Red Black Trees
+ (C) 1999 Andrea Arcangeli <andrea at suse.de>
+ (C) 2002 David Woodhouse <dwmw2 at infradead.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ linux/lib/rbtree.c
+*/
+
+#include "rbtree.h"
+
+static void
+__rb_rotate_left (struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *right = node->rb_right;
+
+ if ((node->rb_right = right->rb_left))
+ right->rb_left->rb_parent = node;
+ right->rb_left = node;
+
+ if ((right->rb_parent = node->rb_parent))
+ {
+ if (node == node->rb_parent->rb_left)
+ node->rb_parent->rb_left = right;
+ else
+ node->rb_parent->rb_right = right;
+ }
+ else
+ root->rb_node = right;
+ node->rb_parent = right;
+}
+
+static void
+__rb_rotate_right (struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *left = node->rb_left;
+
+ if ((node->rb_left = left->rb_right))
+ left->rb_right->rb_parent = node;
+ left->rb_right = node;
+
+ if ((left->rb_parent = node->rb_parent))
+ {
+ if (node == node->rb_parent->rb_right)
+ node->rb_parent->rb_right = left;
+ else
+ node->rb_parent->rb_left = left;
+ }
+ else
+ root->rb_node = left;
+
+ node->rb_parent = left;
+}
+
+void
+rb_insert_color (struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *parent, *gparent;
+
+ while ((parent = node->rb_parent) && parent->rb_color == RB_RED)
+ {
+ gparent = parent->rb_parent;
+
+ if (parent == gparent->rb_left)
+ {
+ {
+ register struct rb_node *uncle = gparent->rb_right;
+ if (uncle && uncle->rb_color == RB_RED)
+ {
+ uncle->rb_color = RB_BLACK;
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ node = gparent;
+ continue;
+ }
+ }
+
+ if (parent->rb_right == node)
+ {
+ register struct rb_node *tmp;
+ __rb_rotate_left(parent, root);
+ tmp = parent;
+ parent = node;
+ node = tmp;
+ }
+
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ __rb_rotate_right(gparent, root);
+ }
+ else
+ {
+ {
+ register struct rb_node *uncle = gparent->rb_left;
+ if (uncle && uncle->rb_color == RB_RED)
+ {
+ uncle->rb_color = RB_BLACK;
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ node = gparent;
+ continue;
+ }
+ }
+
+ if (parent->rb_left == node)
+ {
+ register struct rb_node *tmp;
+ __rb_rotate_right(parent, root);
+ tmp = parent;
+ parent = node;
+ node = tmp;
+ }
+
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ __rb_rotate_left(gparent, root);
+ }
+ }
+
+ root->rb_node->rb_color = RB_BLACK;
+}
+
+static void
+__rb_erase_color (struct rb_node *node, struct rb_node *parent,
+ struct rb_root *root)
+{
+ struct rb_node *other;
+
+ while ((!node || node->rb_color == RB_BLACK) && node != root->rb_node)
+ {
+ if (parent->rb_left == node)
+ {
+ other = parent->rb_right;
+ if (other->rb_color == RB_RED)
+ {
+ other->rb_color = RB_BLACK;
+ parent->rb_color = RB_RED;
+ __rb_rotate_left(parent, root);
+ other = parent->rb_right;
+ }
+ if ((!other->rb_left || other->rb_left->rb_color == RB_BLACK) &&
+ (!other->rb_right || other->rb_right->rb_color == RB_BLACK))
+ {
+ other->rb_color = RB_RED;
+ node = parent;
+ parent = node->rb_parent;
+ }
+ else
+ {
+ if (!other->rb_right || other->rb_right->rb_color == RB_BLACK)
+ {
+ register struct rb_node *o_left;
+ if ((o_left = other->rb_left))
+ o_left->rb_color = RB_BLACK;
+ other->rb_color = RB_RED;
+ __rb_rotate_right(other, root);
+ other = parent->rb_right;
+ }
+ other->rb_color = parent->rb_color;
+ parent->rb_color = RB_BLACK;
+ if (other->rb_right)
+ other->rb_right->rb_color = RB_BLACK;
+ __rb_rotate_left(parent, root);
+ node = root->rb_node;
+ break;
+ }
+ }
+ else
+ {
+ other = parent->rb_left;
+ if (other->rb_color == RB_RED)
+ {
+ other->rb_color = RB_BLACK;
+ parent->rb_color = RB_RED;
+ __rb_rotate_right(parent, root);
+ other = parent->rb_left;
+ }
+ if ((!other->rb_left || other->rb_left->rb_color == RB_BLACK) &&
+ (!other->rb_right || other->rb_right->rb_color == RB_BLACK))
+ {
+ other->rb_color = RB_RED;
+ node = parent;
+ parent = node->rb_parent;
+ }
+ else
+ {
+ if (!other->rb_left || other->rb_left->rb_color == RB_BLACK)
+ {
+ register struct rb_node *o_right;
+ if ((o_right = other->rb_right))
+ o_right->rb_color = RB_BLACK;
+ other->rb_color = RB_RED;
+ __rb_rotate_left(other, root);
+ other = parent->rb_left;
+ }
+ other->rb_color = parent->rb_color;
+ parent->rb_color = RB_BLACK;
+
+ if (other->rb_left)
+ other->rb_left->rb_color = RB_BLACK;
+ __rb_rotate_right(parent, root);
+ node = root->rb_node;
+ break;
+ }
+ }
+ }
+ if (node)
+ node->rb_color = RB_BLACK;
+}
+
+void
+rb_erase (struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *child, *parent;
+ int color;
+
+ if (!node->rb_left)
+ child = node->rb_right;
+ else if (!node->rb_right)
+ child = node->rb_left;
+ else
+ {
+ struct rb_node *old = node, *left;
+
+ node = node->rb_right;
+ while ((left = node->rb_left) != NULL)
+ node = left;
+ child = node->rb_right;
+ parent = node->rb_parent;
+ color = node->rb_color;
+
+ if (child)
+ child->rb_parent = parent;
+ if (parent)
+ {
+ if (parent->rb_left == node)
+ parent->rb_left = child;
+ else
+ parent->rb_right = child;
+ }
+ else
+ root->rb_node = child;
+
+ if (node->rb_parent == old)
+ parent = node;
+ node->rb_parent = old->rb_parent;
+ node->rb_color = old->rb_color;
+ node->rb_right = old->rb_right;
+ node->rb_left = old->rb_left;
+
+ if (old->rb_parent)
+ {
+ if (old->rb_parent->rb_left == old)
+ old->rb_parent->rb_left = node;
+ else
+ old->rb_parent->rb_right = node;
+ } else
+ root->rb_node = node;
+
+ old->rb_left->rb_parent = node;
+ if (old->rb_right)
+ old->rb_right->rb_parent = node;
+ goto color;
+ }
+
+ parent = node->rb_parent;
+ color = node->rb_color;
+
+ if (child)
+ child->rb_parent = parent;
+ if (parent)
+ {
+ if (parent->rb_left == node)
+ parent->rb_left = child;
+ else
+ parent->rb_right = child;
+ }
+ else
+ root->rb_node = child;
+
+color:
+if (color == RB_BLACK)
+ __rb_erase_color(child, parent, root);
+}
+
+/* This function returns the first node (in sort order) of the tree. */
+struct rb_node *
+rb_first (struct rb_root *root)
+{
+ struct rb_node *n;
+
+ n = root->rb_node;
+ if (!n)
+ return NULL;
+ while (n->rb_left)
+ n = n->rb_left;
+ return n;
+}
+
+struct rb_node *
+rb_last (struct rb_root *root)
+{
+ struct rb_node *n;
+
+ n = root->rb_node;
+ if (!n)
+ return NULL;
+ while (n->rb_right)
+ n = n->rb_right;
+ return n;
+}
+
+struct rb_node *
+rb_next (struct rb_node *node)
+{
+ /* If we have a right-hand child, go down and then left as far
+ as we can. */
+ if (node->rb_right)
+ {
+ node = node->rb_right;
+ while (node->rb_left)
+ node=node->rb_left;
+ return node;
+ }
+
+ /* No right-hand children. Everything down and left is
+ smaller than us, so any 'next' node must be in the general
+ direction of our parent. Go up the tree; any time the
+ ancestor is a right-hand child of its parent, keep going
+ up. First time it's a left-hand child of its parent, said
+ parent is our 'next' node. */
+ while (node->rb_parent && node == node->rb_parent->rb_right)
+ node = node->rb_parent;
+
+ return node->rb_parent;
+}
+
+struct rb_node *
+rb_prev (struct rb_node *node)
+{
+ /* If we have a left-hand child, go down and then right as far
+ as we can. */
+ if (node->rb_left)
+ {
+ node = node->rb_left;
+ while (node->rb_right)
+ node=node->rb_right;
+ return node;
+ }
+
+ /* No left-hand children. Go up till we find an ancestor which
+ is a right-hand child of its parent. */
+ while (node->rb_parent && node == node->rb_parent->rb_left)
+ node = node->rb_parent;
+
+ return node->rb_parent;
+}
+
+void
+rb_replace_node (struct rb_node *victim, struct rb_node *new,
+ struct rb_root *root)
+{
+ struct rb_node *parent = victim->rb_parent;
+
+ /* Set the surrounding nodes to point to the replacement. */
+ if (parent) {
+ if (victim == parent->rb_left)
+ parent->rb_left = new;
+ else
+ parent->rb_right = new;
+ } else {
+ root->rb_node = new;
+ }
+
+ if (victim->rb_left)
+ victim->rb_left->rb_parent = new;
+ if (victim->rb_right)
+ victim->rb_right->rb_parent = new;
+
+ /* Copy the pointers/colour from the victim to the replacement. */
+ *new = *victim;
+}
diff --git a/coreutils-6.9/lib/rbtree.h b/coreutils-6.9/lib/rbtree.h
new file mode 100644
index 0000000..0256919
--- /dev/null
+++ b/coreutils-6.9/lib/rbtree.h
@@ -0,0 +1,143 @@
+/*
+ Red Black Trees
+ (C) 1999 Andrea Arcangeli <andrea at suse.de>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ rbtree.h
+
+ To use rbtrees you'll have to implement your own insert and search cores.
+ This will avoid us to use callbacks and to drop drammatically performances.
+ I know it's not the cleaner way, but in C (not in C++) to get
+ performances and genericity...
+
+ Some example of insert and search follows here. The search is a plain
+ normal search over an ordered tree. The insert instead must be implemented
+ int two steps: as first thing the code must insert the element in
+ order as a red leaf in the tree, then the support library function
+ rb_insert_color() must be called. Such function will do the
+ not trivial work to rebalance the rbtree if necessary.
+
+-----------------------------------------------------------------------
+static inline struct page * rb_search_page_cache (struct inode * inode,
+ unsigned long offset)
+{
+ struct rb_node * n = inode->i_rb_page_cache.rb_node;
+ struct page * page;
+
+ while (n)
+ {
+ page = rb_entry (n, struct page, rb_page_cache);
+
+ if (offset < page->offset)
+ n = n->rb_left;
+ else if (offset > page->offset)
+ n = n->rb_right;
+ else
+ return page;
+ }
+ return NULL;
+}
+
+static inline struct page * __rb_insert_page_cache (struct inode * inode,
+ unsigned long offset,
+ struct rb_node * node)
+{
+ struct rb_node ** p = &inode->i_rb_page_cache.rb_node;
+ struct rb_node * parent = NULL;
+ struct page * page;
+
+ while (*p)
+ {
+ parent = *p;
+ page = rb_entry (parent, struct page, rb_page_cache);
+
+ if (offset < page->offset)
+ p = &(*p)->rb_left;
+ else if (offset > page->offset)
+ p = &(*p)->rb_right;
+ else
+ return page;
+ }
+
+ rb_link_node (node, parent, p);
+
+ return NULL;
+}
+
+static inline struct page * rb_insert_page_cache (struct inode * inode,
+ unsigned long offset,
+ struct rb_node * node)
+{
+ struct page * ret;
+ if ((ret = __rb_insert_page_cache (inode, offset, node)))
+ goto out;
+ rb_insert_color (node, &inode->i_rb_page_cache);
+ out:
+ return ret;
+}
+-----------------------------------------------------------------------
+*/
+
+#ifndef _LINUX_RBTREE_H
+#define _LINUX_RBTREE_H
+
+#include <stdlib.h>
+
+struct rb_node
+ {
+ struct rb_node *rb_parent;
+ int rb_color;
+#define RB_RED 0
+#define RB_BLACK 1
+ struct rb_node *rb_right;
+ struct rb_node *rb_left;
+ };
+
+struct rb_root
+ {
+ struct rb_node *rb_node;
+ };
+
+#define RB_ROOT (struct rb_root) { NULL, }
+#define rb_entry(ptr, type, member) \
+ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+extern void rb_insert_color (struct rb_node *, struct rb_root *);
+extern void rb_erase (struct rb_node *, struct rb_root *);
+
+/* Find logical next and previous nodes in a tree. */
+extern struct rb_node *rb_next (struct rb_node *);
+extern struct rb_node *rb_prev (struct rb_node *);
+extern struct rb_node *rb_first (struct rb_root *);
+extern struct rb_node *rb_last (struct rb_root *);
+
+/* Fast replacement of a single node without remove/rebalance/add/rebalance. */
+extern void rb_replace_node (struct rb_node *victim,
+ struct rb_node *new,
+ struct rb_root *root);
+
+static inline void rb_link_node (struct rb_node * node,
+ struct rb_node * parent,
+ struct rb_node ** rb_link)
+{
+ node->rb_parent = parent;
+ node->rb_color = RB_RED;
+ node->rb_left = node->rb_right = NULL;
+
+ *rb_link = node;
+}
+
+#endif /* _LINUX_RBTREE_H */
--
1.5.4.3
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