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add another device mapper fix

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OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=838
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James Fehlig 2020-08-19 21:53:01 +00:00 committed by Git OBS Bridge
parent 101cb20b18
commit 92aa53bd73
3 changed files with 78 additions and 1 deletions
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74
53d9af1e-ignore-devmapper-open-errors.patch Normal file
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@ -0,0 +1,74 @@
commit 53d9af1e7924757e3b5f661131dd707d7110d094
Author: Michal Prívozník <mprivozn@redhat.com>
Date: Wed Aug 19 13:35:55 2020 +0200
virdevmapper: Ignore all errors when opening /dev/mapper/control
So far, only ENOENT is ignored (to deal with kernels without
devmapper). However, as reported on the list, under certain
scenarios a different error can occur. For instance, when libvirt
is running inside a container which doesn't have permissions to
talk to the devmapper. If this is the case, then open() returns
-1 and sets errno=EPERM.
Assuming that multipath devices are fairly narrow use case and
using them in a restricted container is even more narrow the best
fix seems to be to ignore all open errors BUT produce a warning
on failure. To avoid flooding logs with warnings on kernels
without devmapper the level is reduced to a plain debug message.
Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Reviewed-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Index: libvirt-6.6.0/src/util/virdevmapper.c
===================================================================
--- libvirt-6.6.0.orig/src/util/virdevmapper.c
+++ libvirt-6.6.0/src/util/virdevmapper.c
@@ -35,9 +35,12 @@
# include "viralloc.h"
# include "virstring.h"
# include "virfile.h"
+# include "virlog.h"
# define VIR_FROM_THIS VIR_FROM_STORAGE
+VIR_LOG_INIT("util.virdevmapper");
+
# define PROC_DEVICES "/proc/devices"
# define DM_NAME "device-mapper"
# define DEV_DM_DIR "/dev/" DM_DIR
@@ -130,11 +133,15 @@ virDMOpen(void)
memset(&dm, 0, sizeof(dm));
if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0) {
- if (errno == ENOENT)
- return -2;
-
- virReportSystemError(errno, _("Unable to open %s"), CONTROL_PATH);
- return -1;
+ /* We can't talk to devmapper. Produce a warning and let
+ * the caller decide what to do next. */
+ if (errno == ENOENT) {
+ VIR_DEBUG("device mapper not available");
+ } else {
+ VIR_WARN("unable to open %s: %s",
+ CONTROL_PATH, g_strerror(errno));
+ }
+ return -2;
}
if (!virDMIoctl(controlFD, DM_VERSION, &dm, &tmp)) {
@@ -310,9 +317,9 @@ virDevMapperGetTargets(const char *path,
if ((controlFD = virDMOpen()) < 0) {
if (controlFD == -2) {
- /* The CONTROL_PATH doesn't exist. Probably the
- * module isn't loaded, yet. Don't error out, just
- * exit. */
+ /* The CONTROL_PATH doesn't exist or is unusable.
+ * Probably the module isn't loaded, yet. Don't error
+ * out, just exit. */
return 0;
}

3
libvirt.changes
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@ -3,7 +3,8 @@ Wed Aug 19 19:36:52 UTC 2020 - James Fehlig <jfehlig@suse.com>
- virdevmapper: Handle kernel without device-mapper support
82bb167f-dont-cache-devmapper-major.patch,
feb8564a-handle-no-devmapper.patch
feb8564a-handle-no-devmapper.patch,
53d9af1e-ignore-devmapper-open-errors.patch
boo#1175465
-------------------------------------------------------------------

2
libvirt.spec
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@ -339,6 +339,7 @@ Source100: %{name}-rpmlintrc
Patch0: 2edd63a0-fix-virFileSetCOW-logic.patch
Patch1: 82bb167f-dont-cache-devmapper-major.patch
Patch2: feb8564a-handle-no-devmapper.patch
Patch3: 53d9af1e-ignore-devmapper-open-errors.patch
# Patches pending upstream review
Patch100: libxl-dom-reset.patch
Patch101: network-don-t-use-dhcp-authoritative-on-static-netwo.patch
@ -881,6 +882,7 @@ libvirt plugin for NSS for translating domain names into IP addresses.
%patch0 -p1
%patch1 -p1
%patch2 -p1
%patch3 -p1
%patch100 -p1
%patch101 -p1
%patch150 -p1