Bug 624335

Summary:	blockdev-setbsz succeeds, but does not affect blockdev-getbsz
Product:	Red Hat Enterprise Linux 6	Reporter:	Jinxin Zheng <jzheng>
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	low	Docs Contact:
Priority:	low
Version:	6.2	CC:	gaowanlong, leiwang, mbooth, mshao, ptoscano, qguan, qwan, virt-maint
Target Milestone:	rc	Keywords:	Reopened
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libguestfs-1.20.11-4.el6	Doc Type:	Deprecated Functionality
Doc Text:	The blockdev_setbsz API has been deprecated and now does nothing, since the underlying implementation (`blockdev --setbsz`) never did anything useful; see bug #1002825 for further details.	Story Points:	---
Clone Of:	624334	Environment:
Last Closed:	2014-10-14 06:34:40 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	624334, 1016465
Bug Blocks:

Description Jinxin Zheng 2010-08-16 02:59:42 UTC

+++ This bug was initially created as a clone of Bug #624334 +++

Version-Release number of selected component (if applicable):
libguestfs-1.2.7-1.23.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
$ guestfish -a test.img
...
><fs> blockdev-getbsz /dev/sda
4096
><fs> blockdev-setbsz /dev/sda 2048
><fs> blockdev-getbsz /dev/sda
4096

Expected results:
blockdev-getbsz should return the latest block size we just set, or the blockdev-setbsz should return an error if the block size is not supported.

Comment 1 Richard W.M. Jones 2010-11-24 09:07:37 UTC

Deferring to 6.2.  We don't understand why this happens
(likely to be a kernel issue if anything) and we have no
upstream fix for it at present.

Comment 3 Richard W.M. Jones 2011-06-10 09:14:01 UTC

Deferring to 6.3, since no customer or user has raised the issue.

It's still highly likely that this is a kernel bug.

Comment 5 Wanlong Gao 2011-12-29 05:58:13 UTC

reported to LKML:
https://lkml.org/lkml/2011/12/28/181

Thanks,
-Wanlong Gao

Comment 6 Richard W.M. Jones 2012-02-06 13:24:28 UTC

I don't think we have any kind of solution for this
bug yet, so I am deferring it again to 6.4.

Comment 7 RHEL Program Management 2012-07-10 05:51:55 UTC

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 8 RHEL Program Management 2012-07-11 00:01:22 UTC

This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

Comment 9 Richard W.M. Jones 2012-08-10 13:16:28 UTC

Still don't believe there is any kernel solution
for this (it's a kernel bug, nothing to do with libguestfs).
Deferring to RHEL 6.5.

Comment 11 Richard W.M. Jones 2013-06-08 12:16:02 UTC

I'm closing this as WONTFIX since:

 - No customer reported it.

 - It's in a very rarely used API.

 - It's trivial to work around it.

 - It's a kernel bug.

 - There is no fix for it.

Comment 12 Richard W.M. Jones 2013-09-20 08:53:05 UTC

https://bugzilla.redhat.com/show_bug.cgi?id=1002825 sheds more
light on this issue.

Comment 13 Richard W.M. Jones 2013-10-08 08:37:42 UTC

Reopening.  We should deprecate these calls and document
that they never worked.

Comment 16 bfan 2014-07-02 05:21:21 UTC

Verified it by checking documentation.

version: libguestfs-1.20.11-8.el6.x86_64

Comment 17 errata-xmlrpc 2014-10-14 06:34:40 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1458.html