Disk change messages

From: Petr Konecny (pekon@informatics.muni.cz)
Date: Tue Feb 27 2001 - 15:02:08 EST


I've been trying to use vold to automount CDs. The daemon tries to open
/dev/cdrom and if it succeeds it examines the media and mounts it under

The problem is that when there is no disk in the drive the following
  VFS: Disk change detected on device ide1(22,0)
is written to system log during each open call. Vold calls open every 5
seconds, so it's 17280 lines in log/day. I have been able to avoid these
messages by commenting out a line in drivers/ide/ide-cd.c (patch
included) and have not seen any problems yet.

I guess I have three questions:
 1. can this patch break things ? I suppose it could happen only
    if cdrom_saw_media_change was not called when the CD is changed.
 2. is it possible to avoid the message by modifying vold ? E.g. finding
    out that there is no media in the drive without calling open.
 3. is there a clean way to avoid these repeated messages ?

                                                Thanks, Petr

--- ide-cd.c 2001/02/22 22:30:02
+++ ide-cd.c 2001/02/27 19:51:58
@@ -601,7 +601,7 @@

                /* Check for tray open. */
                if (sense_key == NOT_READY) {
- cdrom_saw_media_change (drive);
+/* cdrom_saw_media_change (drive); */
                } else if (sense_key == UNIT_ATTENTION) {
                        /* Check for media change. */
                        cdrom_saw_media_change (drive);

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This archive was generated by hypermail 2b29 : Wed Feb 28 2001 - 21:00:14 EST