2 * Range add and subtract
4 #include <linux/kernel.h>
5 #include <linux/init.h>
6 #include <linux/sort.h>
7 #include <linux/string.h>
8 #include <linux/range.h>
10 int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
19 range[nr_range].start = start;
20 range[nr_range].end = end;
27 int add_range_with_merge(struct range *range, int az, int nr_range,
35 /* get new start/end: */
36 for (i = 0; i < nr_range; i++) {
37 u64 common_start, common_end;
42 common_start = max(range[i].start, start);
43 common_end = min(range[i].end, end);
44 if (common_start > common_end)
47 /* new start/end, will add it back at last */
48 start = min(range[i].start, start);
49 end = max(range[i].end, end);
51 memmove(&range[i], &range[i + 1],
52 (nr_range - (i + 1)) * sizeof(range[i]));
53 range[nr_range - 1].start = 0;
54 range[nr_range - 1].end = 0;
60 return add_range(range, az, nr_range, start, end);
63 void subtract_range(struct range *range, int az, u64 start, u64 end)
70 for (j = 0; j < az; j++) {
74 if (start <= range[j].start && end >= range[j].end) {
80 if (start <= range[j].start && end < range[j].end &&
81 range[j].start < end) {
87 if (start > range[j].start && end >= range[j].end &&
88 range[j].end > start) {
93 if (start > range[j].start && end < range[j].end) {
94 /* Find the new spare: */
95 for (i = 0; i < az; i++) {
96 if (range[i].end == 0)
100 range[i].end = range[j].end;
101 range[i].start = end;
103 pr_err("%s: run out of slot in ranges\n",
106 range[j].end = start;
112 static int cmp_range(const void *x1, const void *x2)
114 const struct range *r1 = x1;
115 const struct range *r2 = x2;
121 return start1 - start2;
124 int clean_sort_range(struct range *range, int az)
126 int i, j, k = az - 1, nr_range = az;
128 for (i = 0; i < k; i++) {
131 for (j = k; j > i; j--) {
139 range[i].start = range[k].start;
140 range[i].end = range[k].end;
146 for (i = 0; i < az; i++) {
154 sort(range, nr_range, sizeof(struct range), cmp_range, NULL);
159 void sort_range(struct range *range, int nr_range)
162 sort(range, nr_range, sizeof(struct range), cmp_range, NULL);