From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Tue, 30 May 2023 13:56:45 +0000 (+0200)
Subject: shared/loop-util: add comment
X-Git-Tag: v254-rc1~335^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6483bcef54d36916b14c07f2b164c6faa8433fe4;p=thirdparty%2Fsystemd.git

shared/loop-util: add comment

Requested in https://github.com/systemd/systemd/commit/afbe20b7d4ed4c3aebbd1b3de00b9b7385dd0ae8#r115653459.
---

diff --git a/src/shared/loop-util.c b/src/shared/loop-util.c
index 5418871093d..a70c5509d56 100644
--- a/src/shared/loop-util.c
+++ b/src/shared/loop-util.c
@@ -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)