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[tony <1907179@xxxxxxxxxxxxxxxxxx>]

Public bug reported:


* description: 
      Hi all，I found a serious problem in revert resize action for a vm. the revert resize operation will let the increments data lost. the reproduction steps show below.


* Step-by-step reproduction steps: 
1、 create a new vm， which flavor choice C1-R2-D10（Core：1， Ram： 2G， Disk：10）， image：centos 76

2、login the vm, and touch a new file: 1.txt, and write some message to
the file. like: echo 'aaa' > 1.txt

3、do resize operation for the vm. change flavor to C2-R4-D20. but do not
confirm or revert the operation now.

4、login the vm again, and touch another new file: 2.txt, and write some
message to the file. like: echo 'bbb' > 2.txt

5、now we do revert-resize operation, revert the resize operation which
in 2 step.

6、when the revert resize done, login in the vm, and we will found the
2.txt will lost.


* Expected output: 

    I think the increment 2.txt added between do resize and revert
should be preserved.


* Actual output: 

     but the 2.txt lost ！！

* Version:
  ** OpenStack version： Rocky
  ** Linux distro, kernel. CentOS Linux release 7.8.2003 (Core)、3.10.0-1127.el7.x86_64

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1907179

Title:
  resize revert will let new data lost

Status in neutron:
  New

Bug description:
  
  * description: 
        Hi all，I found a serious problem in revert resize action for a vm. the revert resize operation will let the increments data lost. the reproduction steps show below.

  
  * Step-by-step reproduction steps: 
  1、 create a new vm， which flavor choice C1-R2-D10（Core：1， Ram： 2G， Disk：10）， image：centos 76

  2、login the vm, and touch a new file: 1.txt, and write some message to
  the file. like: echo 'aaa' > 1.txt

  3、do resize operation for the vm. change flavor to C2-R4-D20. but do
  not confirm or revert the operation now.

  4、login the vm again, and touch another new file: 2.txt, and write
  some message to the file. like: echo 'bbb' > 2.txt

  5、now we do revert-resize operation, revert the resize operation which
  in 2 step.

  6、when the revert resize done, login in the vm, and we will found the
  2.txt will lost.

  
  * Expected output: 

      I think the increment 2.txt added between do resize and revert
  should be preserved.

  
  * Actual output: 

       but the 2.txt lost ！！

  * Version:
    ** OpenStack version： Rocky
    ** Linux distro, kernel. CentOS Linux release 7.8.2003 (Core)、3.10.0-1127.el7.x86_64

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