Bug #20580: rbd map should warn when creating duplicate devices for the same image - rbd - Ceph

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Bug #20580

closed

rbd map should warn when creating duplicate devices for the same image

Added by Jason Dillaman almost 7 years ago. Updated over 6 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Target version:

% Done:

Source:

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Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

[ubuntu@magna079 ~]$ sudo rbd create test0 --image-format 2  --size 4096 --pool rbd
[ubuntu@magna079 ~]$ sudo rbd map test0 --pool rbd 
/dev/rbd0
[ubuntu@magna079 ~]$ sudo rbd map test0 --pool rbd 
/dev/rbd1
[ubuntu@magna079 ~]$ sudo rbd map test0 --pool rbd 
/dev/rbd2
[ubuntu@magna079 ~]$ sudo rbd map test0 --pool rbd 
/dev/rbd3

Related issues 1 (0 open — 1 closed)

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Updated by Yanhu Cao almost 7 years ago

I think the same image should not be mapped more than once. I modified the kernel code(drivers/block/rbd.c), then rbd maps the same image and displays the warning message as shown below.

[root@ceph83 ceph-client]# rbd map disk01
    /dev/rbd0

[root@ceph83 ceph-client]# rbd map disk01@snap02
    /dev/rbd1

[root@ceph83 ceph-client]# rbd map disk01
    rbd: sysfs write failed
    In some cases useful info is found in syslog - try "dmesg | tail".
    rbd: map failed: (5) Input/output error

[root@ceph83 ceph-client]# rbd map disk01@snap02
    rbd: sysfs write failed
    In some cases useful info is found in syslog - try "dmesg | tail".
    rbd: map failed: (5) Input/output error

[root@ceph83 ceph-client]# dmesg | tail
    [ 1873.304577] rbd: rbd0: capacity 10737418240 features 0x1
    [ 1876.055049] rbd: rbd0: 'rbd/disk01@-' already mapped
    [ 1891.184957] rbd: rbd1: capacity 10737418240 features 0x1
    [ 1894.303466] rbd: rbd1: 'rbd/disk01@snap02' already mapped

Any suggestions?

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