shared/loop-util: add comment

Requested in https://github.com/systemd/systemd/commit/afbe20b7d4ed4c3aebbd1b3de00b9b7385dd0ae8#r115653459.
2023-05-30 16:04:35 +02:00
parent e80444729f
commit 6483bcef54
1 changed files with 2 additions and 1 deletions
@@ -818,7 +818,8 @@ static LoopDevice* loop_device_free(LoopDevice *d) {

        /* Now that the block device is released, let's also try to remove it */
        if (control >= 0) {
-                useconds_t delay = 5 * USEC_PER_MSEC;
+                useconds_t delay = 5 * USEC_PER_MSEC;  /* A total delay of 5090 ms between 39 attempts,
+                                                        * (4*5 + 5*10 + 5*20 + … + 3*640) = 5090. */

                for (unsigned attempt = 1;; attempt++) {
                        if (ioctl(control, LOOP_CTL_REMOVE, d->nr) >= 0)