Re: [dm-crypt] renaming of device

[Arno Wagner <arno@wagner.name>]

Just found out why I did not notice this before:
When the disk is not present at mount time, the 
respective entry is not created in /dev/scsi/
and you get the traditional output. I think
"status" should always give the traditional one 
as it has a fixed mapping between major/minor and 
device (see Documentation/devices.txt in the 
Linux sources), while the /dev/scsi/ entry has not.
Maybe have the device in /dev/scsi/ in addition, 
if present, e.g. like this:

root ~>cryptsetup status c1
/dev/mapper/c1 is active:
  cipher:  aes-cbc-essiv:sha256
  keysize: 256 bits
  device:  /dev/sdd (/dev/scsi/sdh4-0c0i0l0)
  offset:  0 sectors
  size:    1953525168 sectors
  mode:    read/write
root ~>

Arno


On Sun, Jan 10, 2010 at 04:16:59PM +0100, Arno Wagner wrote:
> Cryptsetup seems to report the device in /dev/scsi/*
> if they are present, instead of the device name 
> mappings were created with. So I created with /dev/sdd
> and status tells me I have /dev/scsi/sdh4-0c0i0l0,
> which is really a problem because it could cause me 
> to confuse devices and map them twice or the like.
> 
> Is there an easy way to map this back or turn off this
> behaviour or list both device names? What I do at the 
> moment is to look at major and minor of the reported 
> device and than look up which traditional device this 
> matches.
> 
> If this is a fundamental problem, I will likely
> write a wrapper (something like crypt-status)
> that does the lookup for me, but maybe there is 
> an easier solution?
> 
> Arno
> 
> -- 
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
> GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
> ----
> Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
> 
> If it's in the news, don't worry about it.  The very definition of 
> "news" is "something that hardly ever happens." -- Bruce Schneier 
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-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier