!82 when dm-mod not load , libvirt create vm error

From: @friendpalm
Reviewed-by: @imxcc
Signed-off-by: @imxcc

0001-Don-t-cache-device-mapper-major.patch

@@ -0,0 +1,76 @@
+From 1c5804926a289882ff4a84f1c6ca6df1dd117215 Mon Sep 17 00:00:00 2001
+From: rpm-build <rpm-build>
+Date: Tue, 31 Aug 2021 08:22:41 -0400
+Subject: [PATCH] Don't cache device-mapper major
+
+---
+ src/util/virdevmapper.c | 19 +++++--------------
+ 1 file changed, 5 insertions(+), 14 deletions(-)
+
+diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c
+index a471504..2b9e689 100644
+--- a/src/util/virdevmapper.c
++++ b/src/util/virdevmapper.c
+@@ -46,11 +46,8 @@
+ 
+ G_STATIC_ASSERT(BUF_SIZE > sizeof(struct dm_ioctl));
+ 
+-static unsigned int virDMMajor;
+-
+-
+ static int
+-virDevMapperOnceInit(void)
++virDevMapperGetMajor(unsigned int *major)
+ {
+     g_autofree char *buf = NULL;
+     VIR_AUTOSTRINGLIST lines = NULL;
+@@ -69,7 +66,7 @@ virDevMapperOnceInit(void)
+ 
+         if (sscanf(lines[i], "%u %ms\n", &maj, &dev) == 2 &&
+             STREQ(dev, DM_NAME)) {
+-            virDMMajor = maj;
++            *major = maj;
+             break;
+         }
+     }
+@@ -84,10 +81,6 @@ virDevMapperOnceInit(void)
+     return 0;
+ }
+ 
+-
+-VIR_ONCE_GLOBAL_INIT(virDevMapper);
+-
+-
+ static void *
+ virDMIoctl(int controlFD, int cmd, struct dm_ioctl *dm, char **buf)
+ {
+@@ -305,9 +298,6 @@ virDevMapperGetTargets(const char *path,
+      * consist of devices or yet another targets. If that's the
+      * case, we have to stop recursion somewhere. */
+ 
+-    if (virDevMapperInitialize() < 0)
+-        return -1;
+-
+     if ((controlFD = virDMOpen()) < 0)
+         return -1;
+ 
+@@ -319,13 +309,14 @@ bool
+ virIsDevMapperDevice(const char *dev_name)
+ {
+     struct stat buf;
++    unsigned int major;
+ 
+-    if (virDevMapperInitialize() < 0)
++    if (virDevMapperGetMajor(&major) < 0)
+         return false;
+ 
+     if (!stat(dev_name, &buf) &&
+         S_ISBLK(buf.st_mode) &&
+-        major(buf.st_rdev) == virDMMajor)
++        major(buf.st_rdev) == major)
+         return true;
+ 
+     return false;
+-- 
+2.18.2
+

0001-Handle-kernel-without-device-mapper-support.patch

@@ -0,0 +1,58 @@
+From 3c12ed40d06ffe2f2c871667f31925f8727162a4 Mon Sep 17 00:00:00 2001
+From: rpm-build <rpm-build>
+Date: Tue, 31 Aug 2021 08:31:06 -0400
+Subject: [PATCH] Handle kernel without device-mapper support
+
+---
+ src/util/virdevmapper.c | 19 ++++++++++++++++++-
+ 1 file changed, 18 insertions(+), 1 deletion(-)
+
+diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c
+index 2b9e689..158c9d4 100644
+--- a/src/util/virdevmapper.c
++++ b/src/util/virdevmapper.c
+@@ -53,6 +53,9 @@ virDevMapperGetMajor(unsigned int *major)
+     VIR_AUTOSTRINGLIST lines = NULL;
+     size_t i;
+ 
++    if (!virFileExists(CONTROL_PATH))
++        return -2;
++
+     if (virFileReadAll(PROC_DEVICES, BUF_SIZE, &buf) < 0)
+         return -1;
+ 
+@@ -124,8 +127,13 @@ virDMOpen(void)
+ 
+     memset(&dm, 0, sizeof(dm));
+ 
+-    if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0)
++    if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0) {
++        if (errno == ENOENT)
++             return -2;
++
++        virReportSystemError(errno, _("Unable to open %s"), CONTROL_PATH);
+         return -1;
++    }
+ 
+     if (!virDMIoctl(controlFD, DM_VERSION, &dm, &tmp)) {
+         virReportSystemError(errno, "%s",
+@@ -299,7 +307,16 @@ virDevMapperGetTargets(const char *path,
+      * case, we have to stop recursion somewhere. */
+ 
+     if ((controlFD = virDMOpen()) < 0)
++    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. */
++             return 0;
++        }
++
+         return -1;
++    }
+ 
+     return virDevMapperGetTargetsImpl(controlFD, path, devPaths, ttl);
+ }
+-- 
+2.18.2
+

libvirt.spec

@@ -105,7 +105,7 @@
 Summary: Library providing a simple virtualization API
 Name: libvirt
 Version: 6.2.0
-Release: 21
+Release: 22
 License: LGPLv2+
 URL: https://libvirt.org/
 
@@ -184,6 +184,8 @@ Patch0067: tests-fix-stat-mocking-with-Fedora-rawhide.patch
 Patch0068: cpu_map-Add-Cooperlake-x86-CPU-model.patch
 Patch0069: cpu_map-Add-pschange-mc-no-bit-in-IA32_ARCH_CAPABILI.patch
 Patch0070: cpu_map-Distribute-x86_Cooperlake.xml.patch
+Patch0071: 0001-Don-t-cache-device-mapper-major.patch
+Patch0072: 0001-Handle-kernel-without-device-mapper-support.patch
 
 Requires: libvirt-daemon = %{version}-%{release}
 Requires: libvirt-daemon-config-network = %{version}-%{release}
@@ -1917,6 +1919,10 @@ exit 0
 
 
 %changelog
+* Thu Sep 2 2021 heyitao <heyitao@uniontech.com> - 6.2.0-22
+- Don't cache device-mapper major
+- Handle kernel without device-mapper support
+
 * Fri Jul 30 2021 chenyanpanHW <chenyanpan@huawei.com> - 6.2.0-21
 - DESC: delete -S git_am from %autosetup, and delete BuildRequires git