+
+#define BUMP_REQUEST_NR (16*1024)
+
+int bump_request_nr(const char *p) {
+ struct stat st;
+ uint64_t u;
+ char *ap = NULL, *line = NULL;
+ int r;
+ dev_t d;
+
+ assert(p);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0)
+ return 0;
+
+ d = st.st_dev;
+ block_get_whole_disk(d, &d);
+
+ if (asprintf(&ap, "/sys/dev/block/%u:%u/queue/nr_requests", major(d), minor(d)) < 0) {
+ r= -ENOMEM;
+ goto finish;
+ }
+
+ r = read_one_line_file(ap, &line);
+ if (r < 0) {
+ if (r == -ENOENT)
+ r = 0;
+ goto finish;
+ }
+
+ r = safe_atou64(line, &u);
+ if (r >= 0 && u >= BUMP_REQUEST_NR) {
+ r = 0;
+ goto finish;
+ }
+
+ free(line);
+ line = NULL;
+
+ if (asprintf(&line, "%lu", (unsigned long) BUMP_REQUEST_NR) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = write_one_line_file(ap, line);
+ if (r < 0)
+ goto finish;
+
+ log_info("Bumped block_nr parameter of %u:%u to %lu. This is a temporary hack and should be removed one day.", major(d), minor(d), (unsigned long) BUMP_REQUEST_NR);
+ r = 1;
+
+finish:
+ free(ap);
+ free(line);
+
+ return r;
+}