255 lines
6.5 KiB
C
255 lines
6.5 KiB
C
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/*
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* Copyright (c) 2014, Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/list_sort.h>
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#include <linux/interval_tree_generic.h>
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#include "usnic_uiom_interval_tree.h"
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#define START(node) ((node)->start)
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#define LAST(node) ((node)->last)
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#define MAKE_NODE(node, start, end, ref_cnt, flags, err, err_out) \
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do { \
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node = usnic_uiom_interval_node_alloc(start, \
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end, ref_cnt, flags); \
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if (!node) { \
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err = -ENOMEM; \
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goto err_out; \
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} \
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} while (0)
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#define MARK_FOR_ADD(node, list) (list_add_tail(&node->link, list))
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#define MAKE_NODE_AND_APPEND(node, start, end, ref_cnt, flags, err, \
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err_out, list) \
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do { \
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MAKE_NODE(node, start, end, \
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ref_cnt, flags, err, \
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err_out); \
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MARK_FOR_ADD(node, list); \
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} while (0)
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#define FLAGS_EQUAL(flags1, flags2, mask) \
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(((flags1) & (mask)) == ((flags2) & (mask)))
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static struct usnic_uiom_interval_node*
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usnic_uiom_interval_node_alloc(long int start, long int last, int ref_cnt,
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int flags)
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{
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struct usnic_uiom_interval_node *interval = kzalloc(sizeof(*interval),
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GFP_ATOMIC);
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if (!interval)
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return NULL;
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interval->start = start;
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interval->last = last;
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interval->flags = flags;
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interval->ref_cnt = ref_cnt;
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return interval;
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}
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static int interval_cmp(void *priv, struct list_head *a, struct list_head *b)
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{
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struct usnic_uiom_interval_node *node_a, *node_b;
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node_a = list_entry(a, struct usnic_uiom_interval_node, link);
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node_b = list_entry(b, struct usnic_uiom_interval_node, link);
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/* long to int */
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if (node_a->start < node_b->start)
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return -1;
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else if (node_a->start > node_b->start)
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return 1;
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return 0;
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}
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static void
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find_intervals_intersection_sorted(struct rb_root *root, unsigned long start,
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unsigned long last,
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struct list_head *list)
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{
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struct usnic_uiom_interval_node *node;
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INIT_LIST_HEAD(list);
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for (node = usnic_uiom_interval_tree_iter_first(root, start, last);
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node;
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node = usnic_uiom_interval_tree_iter_next(node, start, last))
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list_add_tail(&node->link, list);
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list_sort(NULL, list, interval_cmp);
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}
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int usnic_uiom_get_intervals_diff(unsigned long start, unsigned long last,
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int flags, int flag_mask,
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struct rb_root *root,
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struct list_head *diff_set)
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{
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struct usnic_uiom_interval_node *interval, *tmp;
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int err = 0;
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long int pivot = start;
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LIST_HEAD(intersection_set);
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INIT_LIST_HEAD(diff_set);
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find_intervals_intersection_sorted(root, start, last,
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&intersection_set);
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list_for_each_entry(interval, &intersection_set, link) {
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if (pivot < interval->start) {
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MAKE_NODE_AND_APPEND(tmp, pivot, interval->start - 1,
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1, flags, err, err_out,
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diff_set);
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pivot = interval->start;
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}
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/*
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* Invariant: Set [start, pivot] is either in diff_set or root,
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* but not in both.
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*/
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if (pivot > interval->last) {
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continue;
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} else if (pivot <= interval->last &&
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FLAGS_EQUAL(interval->flags, flags,
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flag_mask)) {
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pivot = interval->last + 1;
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}
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}
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if (pivot <= last)
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MAKE_NODE_AND_APPEND(tmp, pivot, last, 1, flags, err, err_out,
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diff_set);
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return 0;
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err_out:
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list_for_each_entry_safe(interval, tmp, diff_set, link) {
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list_del(&interval->link);
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kfree(interval);
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}
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return err;
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}
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void usnic_uiom_put_interval_set(struct list_head *intervals)
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{
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struct usnic_uiom_interval_node *interval, *tmp;
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list_for_each_entry_safe(interval, tmp, intervals, link)
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kfree(interval);
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}
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int usnic_uiom_insert_interval(struct rb_root *root, unsigned long start,
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unsigned long last, int flags)
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{
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struct usnic_uiom_interval_node *interval, *tmp;
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unsigned long istart, ilast;
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int iref_cnt, iflags;
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unsigned long lpivot = start;
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int err = 0;
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LIST_HEAD(to_add);
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LIST_HEAD(intersection_set);
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find_intervals_intersection_sorted(root, start, last,
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&intersection_set);
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list_for_each_entry(interval, &intersection_set, link) {
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/*
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* Invariant - lpivot is the left edge of next interval to be
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* inserted
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*/
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istart = interval->start;
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ilast = interval->last;
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iref_cnt = interval->ref_cnt;
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iflags = interval->flags;
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if (istart < lpivot) {
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MAKE_NODE_AND_APPEND(tmp, istart, lpivot - 1, iref_cnt,
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iflags, err, err_out, &to_add);
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} else if (istart > lpivot) {
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MAKE_NODE_AND_APPEND(tmp, lpivot, istart - 1, 1, flags,
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err, err_out, &to_add);
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lpivot = istart;
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} else {
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lpivot = istart;
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}
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if (ilast > last) {
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MAKE_NODE_AND_APPEND(tmp, lpivot, last, iref_cnt + 1,
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iflags | flags, err, err_out,
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&to_add);
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MAKE_NODE_AND_APPEND(tmp, last + 1, ilast, iref_cnt,
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iflags, err, err_out, &to_add);
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} else {
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MAKE_NODE_AND_APPEND(tmp, lpivot, ilast, iref_cnt + 1,
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iflags | flags, err, err_out,
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&to_add);
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}
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lpivot = ilast + 1;
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}
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if (lpivot <= last)
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MAKE_NODE_AND_APPEND(tmp, lpivot, last, 1, flags, err, err_out,
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&to_add);
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list_for_each_entry_safe(interval, tmp, &intersection_set, link) {
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usnic_uiom_interval_tree_remove(interval, root);
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kfree(interval);
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}
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list_for_each_entry(interval, &to_add, link)
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usnic_uiom_interval_tree_insert(interval, root);
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return 0;
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err_out:
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list_for_each_entry_safe(interval, tmp, &to_add, link)
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kfree(interval);
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return err;
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}
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void usnic_uiom_remove_interval(struct rb_root *root, unsigned long start,
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unsigned long last, struct list_head *removed)
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{
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struct usnic_uiom_interval_node *interval;
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for (interval = usnic_uiom_interval_tree_iter_first(root, start, last);
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interval;
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interval = usnic_uiom_interval_tree_iter_next(interval,
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start,
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last)) {
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if (--interval->ref_cnt == 0)
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list_add_tail(&interval->link, removed);
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}
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list_for_each_entry(interval, removed, link)
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usnic_uiom_interval_tree_remove(interval, root);
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}
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INTERVAL_TREE_DEFINE(struct usnic_uiom_interval_node, rb,
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unsigned long, __subtree_last,
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START, LAST, , usnic_uiom_interval_tree)
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