Description of problem: This bug is to track the kernel changes needed for bug 444421. Device-mapper currently does not propagate EROFS errors from the dm constructor to user space so multipath-tools cannot take appropriate decisions when constructing multipath maps for these devices. Ben has a proposed patch attached to bug 444421: https://bugzilla.redhat.com/attachment.cgi?id=306846 Version-Release number of selected component (if applicable): RHEL-5.2 How reproducible: 100% Steps to Reproduce: 1. Present a readonly device from an array 2. Scan for devices from the host 3. run "multipath -v3" Actual results: "domap (0) failure for create/reload map" is observed for the readonly device and the multipath map is not getting created. Expected results: DM devices have to be created for readonly devices also. Actual results:
Created attachment 316070 [details] mpath propagate path errors Propagate path errors to user space from multipath constructor.
Patch in comment#1 is in agk's patch set: http://kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-mpath-use-more-error-codes.patch
Upstream in 2.6.28. commit 01460f3520c100010aacc8f8500cafcb17ce4665 Author: Benjamin Marzinski <bmarzins> Date: Fri Oct 10 13:36:57 2008 +0100 dm mpath: use more error codes This patch allows path errors from the multipath ctr function to propagate up to userspace as errno values from the ioctl() call. This is in response to https://www.redhat.com/archives/dm-devel/2008-May/msg00000.html and https://bugzilla.redhat.com/show_bug.cgi?id=444421 The patch only lets through the errors that it needs to in order to get the path errors from parse_path(). Signed-off-by: Benjamin Marzinski <bmarzins> Signed-off-by: Alasdair G Kergon <agk>
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
Updating PM score.
in kernel-2.6.18-141.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please do NOT transition this bugzilla state to VERIFIED until our QE team has sent specific instructions indicating when to do so. However feel free to provide a comment indicating that this fix has been verified.
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An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-1243.html