--- /dev/null
+/*
+ Interval Trees
+ (C) 2012 Michel Lespinasse <walken@google.com>
+
+ 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
+
+ include/linux/interval_tree_generic.h
+*/
+
+#include <linux/rbtree_augmented.h>
+
+/*
+ * Template for implementing interval trees
+ *
+ * ITSTRUCT: struct type of the interval tree nodes
+ * ITRB: name of struct rb_node field within ITSTRUCT
+ * ITTYPE: type of the interval endpoints
+ * ITSUBTREE: name of ITTYPE field within ITSTRUCT holding last-in-subtree
+ * ITSTART(n): start endpoint of ITSTRUCT node n
+ * ITLAST(n): last endpoint of ITSTRUCT node n
+ * ITSTATIC: 'static' or empty
+ * ITPREFIX: prefix to use for the inline tree definitions
+ *
+ * Note - before using this, please consider if non-generic version
+ * (interval_tree.h) would work for you...
+ */
+
+#define INTERVAL_TREE_DEFINE(ITSTRUCT, ITRB, ITTYPE, ITSUBTREE, \
+ ITSTART, ITLAST, ITSTATIC, ITPREFIX) \
+ \
+/* Callbacks for augmented rbtree insert and remove */ \
+ \
+static inline ITTYPE ITPREFIX ## _compute_subtree_last(ITSTRUCT *node) \
+{ \
+ ITTYPE max = ITLAST(node), subtree_last; \
+ if (node->ITRB.rb_left) { \
+ subtree_last = rb_entry(node->ITRB.rb_left, \
+ ITSTRUCT, ITRB)->ITSUBTREE; \
+ if (max < subtree_last) \
+ max = subtree_last; \
+ } \
+ if (node->ITRB.rb_right) { \
+ subtree_last = rb_entry(node->ITRB.rb_right, \
+ ITSTRUCT, ITRB)->ITSUBTREE; \
+ if (max < subtree_last) \
+ max = subtree_last; \
+ } \
+ return max; \
+} \
+ \
+RB_DECLARE_CALLBACKS(static, ITPREFIX ## _augment, ITSTRUCT, ITRB, \
+ ITTYPE, ITSUBTREE, ITPREFIX ## _compute_subtree_last) \
+ \
+/* Insert / remove interval nodes from the tree */ \
+ \
+ITSTATIC void ITPREFIX ## _insert(ITSTRUCT *node, struct rb_root *root) \
+{ \
+ struct rb_node **link = &root->rb_node, *rb_parent = NULL; \
+ ITTYPE start = ITSTART(node), last = ITLAST(node); \
+ ITSTRUCT *parent; \
+ \
+ while (*link) { \
+ rb_parent = *link; \
+ parent = rb_entry(rb_parent, ITSTRUCT, ITRB); \
+ if (parent->ITSUBTREE < last) \
+ parent->ITSUBTREE = last; \
+ if (start < ITSTART(parent)) \
+ link = &parent->ITRB.rb_left; \
+ else \
+ link = &parent->ITRB.rb_right; \
+ } \
+ \
+ node->ITSUBTREE = last; \
+ rb_link_node(&node->ITRB, rb_parent, link); \
+ rb_insert_augmented(&node->ITRB, root, &ITPREFIX ## _augment); \
+} \
+ \
+ITSTATIC void ITPREFIX ## _remove(ITSTRUCT *node, struct rb_root *root) \
+{ \
+ rb_erase_augmented(&node->ITRB, root, &ITPREFIX ## _augment); \
+} \
+ \
+/* \
+ * Iterate over intervals intersecting [start;last] \
+ * \
+ * Note that a node's interval intersects [start;last] iff: \
+ * Cond1: ITSTART(node) <= last \
+ * and \
+ * Cond2: start <= ITLAST(node) \
+ */ \
+ \
+static ITSTRUCT * \
+ITPREFIX ## _subtree_search(ITSTRUCT *node, ITTYPE start, ITTYPE last) \
+{ \
+ while (true) { \
+ /* \
+ * Loop invariant: start <= node->ITSUBTREE \
+ * (Cond2 is satisfied by one of the subtree nodes) \
+ */ \
+ if (node->ITRB.rb_left) { \
+ ITSTRUCT *left = rb_entry(node->ITRB.rb_left, \
+ ITSTRUCT, ITRB); \
+ if (start <= left->ITSUBTREE) { \
+ /* \
+ * Some nodes in left subtree satisfy Cond2. \
+ * Iterate to find the leftmost such node N. \
+ * If it also satisfies Cond1, that's the \
+ * match we are looking for. Otherwise, there \
+ * is no matching interval as nodes to the \
+ * right of N can't satisfy Cond1 either. \
+ */ \
+ node = left; \
+ continue; \
+ } \
+ } \
+ if (ITSTART(node) <= last) { /* Cond1 */ \
+ if (start <= ITLAST(node)) /* Cond2 */ \
+ return node; /* node is leftmost match */ \
+ if (node->ITRB.rb_right) { \
+ node = rb_entry(node->ITRB.rb_right, \
+ ITSTRUCT, ITRB); \
+ if (start <= node->ITSUBTREE) \
+ continue; \
+ } \
+ } \
+ return NULL; /* No match */ \
+ } \
+} \
+ \
+ITSTATIC ITSTRUCT * \
+ITPREFIX ## _iter_first(struct rb_root *root, ITTYPE start, ITTYPE last) \
+{ \
+ ITSTRUCT *node; \
+ \
+ if (!root->rb_node) \
+ return NULL; \
+ node = rb_entry(root->rb_node, ITSTRUCT, ITRB); \
+ if (node->ITSUBTREE < start) \
+ return NULL; \
+ return ITPREFIX ## _subtree_search(node, start, last); \
+} \
+ \
+ITSTATIC ITSTRUCT * \
+ITPREFIX ## _iter_next(ITSTRUCT *node, ITTYPE start, ITTYPE last) \
+{ \
+ struct rb_node *rb = node->ITRB.rb_right, *prev; \
+ \
+ while (true) { \
+ /* \
+ * Loop invariants: \
+ * Cond1: ITSTART(node) <= last \
+ * rb == node->ITRB.rb_right \
+ * \
+ * First, search right subtree if suitable \
+ */ \
+ if (rb) { \
+ ITSTRUCT *right = rb_entry(rb, ITSTRUCT, ITRB); \
+ if (start <= right->ITSUBTREE) \
+ return ITPREFIX ## _subtree_search(right, \
+ start, last); \
+ } \
+ \
+ /* Move up the tree until we come from a node's left child */ \
+ do { \
+ rb = rb_parent(&node->ITRB); \
+ if (!rb) \
+ return NULL; \
+ prev = &node->ITRB; \
+ node = rb_entry(rb, ITSTRUCT, ITRB); \
+ rb = node->ITRB.rb_right; \
+ } while (prev == rb); \
+ \
+ /* Check if the node intersects [start;last] */ \
+ if (last < ITSTART(node)) /* !Cond1 */ \
+ return NULL; \
+ else if (start <= ITLAST(node)) /* Cond2 */ \
+ return node; \
+ } \
+}
+++ /dev/null
-/*
- Interval Trees
- (C) 2012 Michel Lespinasse <walken@google.com>
-
- 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
-
- include/linux/interval_tree_tmpl.h
-*/
-
-#include <linux/rbtree_augmented.h>
-
-/*
- * Template for implementing interval trees
- *
- * ITSTRUCT: struct type of the interval tree nodes
- * ITRB: name of struct rb_node field within ITSTRUCT
- * ITTYPE: type of the interval endpoints
- * ITSUBTREE: name of ITTYPE field within ITSTRUCT holding last-in-subtree
- * ITSTART(n): start endpoint of ITSTRUCT node n
- * ITLAST(n): last endpoing of ITSTRUCT node n
- * ITSTATIC: 'static' or empty
- * ITPREFIX: prefix to use for the inline tree definitions
- */
-
-/* IT(name) -> ITPREFIX_name */
-#define _ITNAME(prefix, name) prefix ## _ ## name
-#define ITNAME(prefix, name) _ITNAME(prefix, name)
-#define IT(name) ITNAME(ITPREFIX, name)
-
-/* Callbacks for augmented rbtree insert and remove */
-
-static inline ITTYPE IT(compute_subtree_last)(ITSTRUCT *node)
-{
- ITTYPE max = ITLAST(node), subtree_last;
- if (node->ITRB.rb_left) {
- subtree_last = rb_entry(node->ITRB.rb_left,
- ITSTRUCT, ITRB)->ITSUBTREE;
- if (max < subtree_last)
- max = subtree_last;
- }
- if (node->ITRB.rb_right) {
- subtree_last = rb_entry(node->ITRB.rb_right,
- ITSTRUCT, ITRB)->ITSUBTREE;
- if (max < subtree_last)
- max = subtree_last;
- }
- return max;
-}
-
-static inline void
-IT(augment_propagate)(struct rb_node *rb, struct rb_node *stop)
-{
- while (rb != stop) {
- ITSTRUCT *node = rb_entry(rb, ITSTRUCT, ITRB);
- ITTYPE subtree_last = IT(compute_subtree_last)(node);
- if (node->ITSUBTREE == subtree_last)
- break;
- node->ITSUBTREE = subtree_last;
- rb = rb_parent(&node->ITRB);
- }
-}
-
-static inline void
-IT(augment_copy)(struct rb_node *rb_old, struct rb_node *rb_new)
-{
- ITSTRUCT *old = rb_entry(rb_old, ITSTRUCT, ITRB);
- ITSTRUCT *new = rb_entry(rb_new, ITSTRUCT, ITRB);
-
- new->ITSUBTREE = old->ITSUBTREE;
-}
-
-static void IT(augment_rotate)(struct rb_node *rb_old, struct rb_node *rb_new)
-{
- ITSTRUCT *old = rb_entry(rb_old, ITSTRUCT, ITRB);
- ITSTRUCT *new = rb_entry(rb_new, ITSTRUCT, ITRB);
-
- new->ITSUBTREE = old->ITSUBTREE;
- old->ITSUBTREE = IT(compute_subtree_last)(old);
-}
-
-static const struct rb_augment_callbacks IT(augment_callbacks) = {
- IT(augment_propagate), IT(augment_copy), IT(augment_rotate)
-};
-
-/* Insert / remove interval nodes from the tree */
-
-ITSTATIC void IT(insert)(ITSTRUCT *node, struct rb_root *root)
-{
- struct rb_node **link = &root->rb_node, *rb_parent = NULL;
- ITTYPE start = ITSTART(node), last = ITLAST(node);
- ITSTRUCT *parent;
-
- while (*link) {
- rb_parent = *link;
- parent = rb_entry(rb_parent, ITSTRUCT, ITRB);
- if (parent->ITSUBTREE < last)
- parent->ITSUBTREE = last;
- if (start < ITSTART(parent))
- link = &parent->ITRB.rb_left;
- else
- link = &parent->ITRB.rb_right;
- }
-
- node->ITSUBTREE = last;
- rb_link_node(&node->ITRB, rb_parent, link);
- rb_insert_augmented(&node->ITRB, root, &IT(augment_callbacks));
-}
-
-ITSTATIC void IT(remove)(ITSTRUCT *node, struct rb_root *root)
-{
- rb_erase_augmented(&node->ITRB, root, &IT(augment_callbacks));
-}
-
-/*
- * Iterate over intervals intersecting [start;last]
- *
- * Note that a node's interval intersects [start;last] iff:
- * Cond1: ITSTART(node) <= last
- * and
- * Cond2: start <= ITLAST(node)
- */
-
-static ITSTRUCT *IT(subtree_search)(ITSTRUCT *node, ITTYPE start, ITTYPE last)
-{
- while (true) {
- /*
- * Loop invariant: start <= node->ITSUBTREE
- * (Cond2 is satisfied by one of the subtree nodes)
- */
- if (node->ITRB.rb_left) {
- ITSTRUCT *left = rb_entry(node->ITRB.rb_left,
- ITSTRUCT, ITRB);
- if (start <= left->ITSUBTREE) {
- /*
- * Some nodes in left subtree satisfy Cond2.
- * Iterate to find the leftmost such node N.
- * If it also satisfies Cond1, that's the match
- * we are looking for. Otherwise, there is no
- * matching interval as nodes to the right of N
- * can't satisfy Cond1 either.
- */
- node = left;
- continue;
- }
- }
- if (ITSTART(node) <= last) { /* Cond1 */
- if (start <= ITLAST(node)) /* Cond2 */
- return node; /* node is leftmost match */
- if (node->ITRB.rb_right) {
- node = rb_entry(node->ITRB.rb_right,
- ITSTRUCT, ITRB);
- if (start <= node->ITSUBTREE)
- continue;
- }
- }
- return NULL; /* No match */
- }
-}
-
-ITSTATIC ITSTRUCT *IT(iter_first)(struct rb_root *root,
- ITTYPE start, ITTYPE last)
-{
- ITSTRUCT *node;
-
- if (!root->rb_node)
- return NULL;
- node = rb_entry(root->rb_node, ITSTRUCT, ITRB);
- if (node->ITSUBTREE < start)
- return NULL;
- return IT(subtree_search)(node, start, last);
-}
-
-ITSTATIC ITSTRUCT *IT(iter_next)(ITSTRUCT *node, ITTYPE start, ITTYPE last)
-{
- struct rb_node *rb = node->ITRB.rb_right, *prev;
-
- while (true) {
- /*
- * Loop invariants:
- * Cond1: ITSTART(node) <= last
- * rb == node->ITRB.rb_right
- *
- * First, search right subtree if suitable
- */
- if (rb) {
- ITSTRUCT *right = rb_entry(rb, ITSTRUCT, ITRB);
- if (start <= right->ITSUBTREE)
- return IT(subtree_search)(right, start, last);
- }
-
- /* Move up the tree until we come from a node's left child */
- do {
- rb = rb_parent(&node->ITRB);
- if (!rb)
- return NULL;
- prev = &node->ITRB;
- node = rb_entry(rb, ITSTRUCT, ITRB);
- rb = node->ITRB.rb_right;
- } while (prev == rb);
-
- /* Check if the node intersects [start;last] */
- if (last < ITSTART(node)) /* !Cond1 */
- return NULL;
- else if (start <= ITLAST(node)) /* Cond2 */
- return node;
- }
-}
extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
/* interval_tree.c */
-void vma_interval_tree_add(struct vm_area_struct *vma,
- struct vm_area_struct *old,
- struct address_space *mapping);
void vma_interval_tree_insert(struct vm_area_struct *node,
struct rb_root *root);
+void vma_interval_tree_insert_after(struct vm_area_struct *node,
+ struct vm_area_struct *prev,
+ struct rb_root *root);
void vma_interval_tree_remove(struct vm_area_struct *node,
struct rb_root *root);
struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
mapping->i_mmap_writable++;
flush_dcache_mmap_lock(mapping);
/* insert tmp into the share list, just after mpnt */
- vma_interval_tree_add(tmp, mpnt, mapping);
+ if (unlikely(tmp->vm_flags & VM_NONLINEAR))
+ vma_nonlinear_insert(tmp,
+ &mapping->i_mmap_nonlinear);
+ else
+ vma_interval_tree_insert_after(tmp, mpnt,
+ &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
mutex_unlock(&mapping->i_mmap_mutex);
}
#include <linux/init.h>
#include <linux/interval_tree.h>
+#include <linux/interval_tree_generic.h>
-#define ITSTRUCT struct interval_tree_node
-#define ITRB rb
-#define ITTYPE unsigned long
-#define ITSUBTREE __subtree_last
-#define ITSTART(n) ((n)->start)
-#define ITLAST(n) ((n)->last)
-#define ITSTATIC
-#define ITPREFIX interval_tree
+#define START(node) ((node)->start)
+#define LAST(node) ((node)->last)
-#include <linux/interval_tree_tmpl.h>
+INTERVAL_TREE_DEFINE(struct interval_tree_node, rb,
+ unsigned long, __subtree_last,
+ START, LAST,, interval_tree)
#include <linux/mm.h>
#include <linux/fs.h>
+#include <linux/interval_tree_generic.h>
-#define ITSTRUCT struct vm_area_struct
-#define ITRB shared.linear.rb
-#define ITTYPE unsigned long
-#define ITSUBTREE shared.linear.rb_subtree_last
-#define ITSTART(n) ((n)->vm_pgoff)
-#define ITLAST(n) ((n)->vm_pgoff + \
- (((n)->vm_end - (n)->vm_start) >> PAGE_SHIFT) - 1)
-#define ITSTATIC
-#define ITPREFIX vma_interval_tree
-
-#include <linux/interval_tree_tmpl.h>
-
-/* Insert old immediately after vma in the interval tree */
-void vma_interval_tree_add(struct vm_area_struct *vma,
- struct vm_area_struct *old,
- struct address_space *mapping)
+static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
+{
+ return v->vm_pgoff;
+}
+
+static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
+{
+ return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
+}
+
+INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.linear.rb,
+ unsigned long, shared.linear.rb_subtree_last,
+ vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
+
+/* Insert node immediately after prev in the interval tree */
+void vma_interval_tree_insert_after(struct vm_area_struct *node,
+ struct vm_area_struct *prev,
+ struct rb_root *root)
{
struct rb_node **link;
struct vm_area_struct *parent;
- unsigned long last;
-
- if (unlikely(vma->vm_flags & VM_NONLINEAR)) {
- list_add(&vma->shared.nonlinear, &old->shared.nonlinear);
- return;
- }
+ unsigned long last = vma_last_pgoff(node);
- last = ITLAST(vma);
+ VM_BUG_ON(vma_start_pgoff(node) != vma_start_pgoff(prev));
- if (!old->shared.linear.rb.rb_right) {
- parent = old;
- link = &old->shared.linear.rb.rb_right;
+ if (!prev->shared.linear.rb.rb_right) {
+ parent = prev;
+ link = &prev->shared.linear.rb.rb_right;
} else {
- parent = rb_entry(old->shared.linear.rb.rb_right,
+ parent = rb_entry(prev->shared.linear.rb.rb_right,
struct vm_area_struct, shared.linear.rb);
if (parent->shared.linear.rb_subtree_last < last)
parent->shared.linear.rb_subtree_last = last;
link = &parent->shared.linear.rb.rb_left;
}
- vma->shared.linear.rb_subtree_last = last;
- rb_link_node(&vma->shared.linear.rb, &parent->shared.linear.rb, link);
- rb_insert_augmented(&vma->shared.linear.rb, &mapping->i_mmap,
- &vma_interval_tree_augment_callbacks);
+ node->shared.linear.rb_subtree_last = last;
+ rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
+ rb_insert_augmented(&node->shared.linear.rb, root,
+ &vma_interval_tree_augment);
}
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