Hmm looking at the code I think its buggy. I'm not sure what it is
actually trying to do but it doesn't seem to be doing it right in any
case. It appears to be 8 bit shifting left, and then checking for 0. If
the device is in use lsof returns 0 if it is not then it returns 1, at
least as best as I can tell, in which case doing the bit shift causes
the problem. I am not sure why it was added, but it probably was needed
for something.
# Check if userspace uses this device
my $lsof_check = check_exe("lsof");
if ($lsof_check ne 1) {
system("lsof $backing_store &>/dev/null");
my $exit_value = $? >> 8;
if ($exit_value eq 0) {
execute("# Device $backing_store is used (already tgtd
target?).");
execute("# Run 'lsof $backing_store' to see the
details.");
return 0;
}
}
return 1;
}
--
tgtd target will not start unless it's configured with "allow-in-use yes"
https://bugs.launchpad.net/bugs/605721
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