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[libvirt] [RFC] [PATCH v3 2/6] add fuse support for libvirt lxc



this patch addes fuse support for libvirt lxc.
we can use fuse filesystem to generate sysinfo dynamically,
So we can isolate /proc/meminfo,cpuinfo and so on through
fuse filesystem.

we mount fuse filesystem for every container.the mount name
is Lxc-containename-fuse,mount point is
localstatedir/run/libvirt/lxc/containername.

Signed-off-by: Gao feng <gaofeng cn fujitsu com>
---
 po/POTFILES.in           |    1 +
 src/Makefile.am          |    9 ++-
 src/lxc/lxc_controller.c |   10 +++
 src/lxc/lxc_fuse.c       |  151 ++++++++++++++++++++++++++++++++++++++++++++++
 src/lxc/lxc_fuse.h       |   40 ++++++++++++
 src/lxc/lxc_process.c    |    3 +-
 6 files changed, 211 insertions(+), 3 deletions(-)
 create mode 100644 src/lxc/lxc_fuse.c
 create mode 100644 src/lxc/lxc_fuse.h

diff --git a/po/POTFILES.in b/po/POTFILES.in
index 7a91eb4..f8244a0 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -47,6 +47,7 @@ src/libvirt-qemu.c
 src/locking/lock_driver_sanlock.c
 src/locking/lock_manager.c
 src/lxc/lxc_cgroup.c
+src/lxc/lxc_fuse.c
 src/lxc/lxc_container.c
 src/lxc/lxc_conf.c
 src/lxc/lxc_controller.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 9f27fcf..c4ac35b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -409,6 +409,7 @@ LXC_DRIVER_SOURCES =						\
 		lxc/lxc_domain.c lxc/lxc_domain.h		\
 		lxc/lxc_monitor.c lxc/lxc_monitor.h		\
 		lxc/lxc_process.c lxc/lxc_process.h		\
+		lxc/lxc_fuse.c lxc/lxc_fuse.h			\
 		lxc/lxc_driver.c lxc/lxc_driver.h
 
 LXC_CONTROLLER_SOURCES =					\
@@ -417,6 +418,7 @@ LXC_CONTROLLER_SOURCES =					\
 		lxc/lxc_conf.c lxc/lxc_conf.h			\
 		lxc/lxc_container.c lxc/lxc_container.h		\
 		lxc/lxc_cgroup.c lxc/lxc_cgroup.h		\
+		lxc/lxc_fuse.c lxc/lxc_fuse.h			\
 		lxc/lxc_controller.c
 
 SECURITY_DRIVER_APPARMOR_HELPER_SOURCES =			\
@@ -893,8 +895,9 @@ endif
 
 libvirt_driver_lxc_impl_la_CFLAGS = \
 		$(LIBNL_CFLAGS) \
+		$(FUSE_CFLAGS) \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
-libvirt_driver_lxc_impl_la_LIBADD = $(CAPNG_LIBS) $(LIBNL_LIBS)
+libvirt_driver_lxc_impl_la_LIBADD = $(CAPNG_LIBS) $(LIBNL_LIBS) $(FUSE_LIBS)
 if HAVE_LIBBLKID
 libvirt_driver_lxc_impl_la_CFLAGS += $(BLKID_CFLAGS)
 libvirt_driver_lxc_impl_la_LIBADD += $(BLKID_LIBS)
@@ -1637,6 +1640,7 @@ libvirt_lxc_SOURCES =						\
 libvirt_lxc_LDFLAGS = $(WARN_CFLAGS) $(AM_LDFLAGS)
 libvirt_lxc_LDADD =			\
 		$(NUMACTL_LIBS) \
+		$(FUSE_LIBS) \
 		libvirt-net-rpc-server.la \
 		libvirt-net-rpc.la \
 		libvirt_security_manager.la \
@@ -1655,7 +1659,8 @@ endif
 libvirt_lxc_CFLAGS =				\
 		-I$(top_srcdir)/src/conf	\
 		$(AM_CFLAGS)                    \
-		$(LIBNL_CFLAGS)
+		$(LIBNL_CFLAGS)			\
+		$(FUSE_CFLAGS)
 if HAVE_LIBBLKID
 libvirt_lxc_CFLAGS += $(BLKID_CFLAGS)
 libvirt_lxc_LDADD += $(BLKID_LIBS)
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index e5aea11..c5f4951 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -60,6 +60,7 @@
 #include "lxc_container.h"
 #include "lxc_cgroup.h"
 #include "lxc_protocol.h"
+#include "lxc_fuse.h"
 #include "virnetdev.h"
 #include "virnetdevveth.h"
 #include "memory.h"
@@ -1471,6 +1472,7 @@ int main(int argc, char *argv[])
     char *name = NULL;
     size_t nveths = 0;
     char **veths = NULL;
+    virThread thread;
     int handshakeFd = -1;
     int bg = 0;
     const struct option options[] = {
@@ -1657,6 +1659,14 @@ int main(int argc, char *argv[])
         }
     }
 
+    rc = virThreadCreate(&thread, true, lxcRegisterFuse,
+                         (void *)ctrl->def);
+    if (rc < 0) {
+        virReportSystemError(-rc, "%s",
+                             _("Create Fuse filesystem failed"));
+        goto cleanup;
+    }
+
     rc = virLXCControllerRun(ctrl);
 
 cleanup:
diff --git a/src/lxc/lxc_fuse.c b/src/lxc/lxc_fuse.c
new file mode 100644
index 0000000..868a698
--- /dev/null
+++ b/src/lxc/lxc_fuse.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2012 Fujitsu Limited.
+ *
+ * lxc_fuse.c: fuse filesystem support for libvirt lxc
+ *
+ * Authors:
+ *  Gao feng <gaofeng at cn.fujitsu.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/mount.h>
+
+#include "lxc_fuse.h"
+#include "virterror_internal.h"
+
+#define VIR_FROM_THIS VIR_FROM_LXC
+
+#if HAVE_FUSE
+
+static int lxcProcGetattr(const char *path, struct stat *stbuf)
+{
+    int res = 0;
+
+    memset(stbuf, 0, sizeof(struct stat));
+
+    if (STREQ(path, "/")) {
+        stbuf->st_mode = S_IFDIR | 0755;
+        stbuf->st_nlink = 2;
+    } else {
+        res = -ENOENT;
+    }
+
+    return res;
+}
+
+static int lxcProcReaddir(const char *path, void *buf,
+                          fuse_fill_dir_t filler,
+                          off_t offset ATTRIBUTE_UNUSED,
+                          struct fuse_file_info *fi ATTRIBUTE_UNUSED)
+{
+    if (!STREQ(path, "/"))
+        return -ENOENT;
+
+    filler(buf, ".", NULL, 0);
+    filler(buf, "..", NULL, 0);
+
+    return 0;
+}
+
+static int lxcProcOpen(const char *path ATTRIBUTE_UNUSED,
+                       struct fuse_file_info *fi ATTRIBUTE_UNUSED)
+{
+    return -ENOENT;
+}
+
+static int lxcProcRead(const char *path ATTRIBUTE_UNUSED,
+                       char *buf ATTRIBUTE_UNUSED,
+                       size_t size ATTRIBUTE_UNUSED,
+                       off_t offset ATTRIBUTE_UNUSED,
+                       struct fuse_file_info *fi ATTRIBUTE_UNUSED)
+{
+    return -ENOENT;
+}
+
+static struct fuse_operations lxcProcOper = {
+    .getattr = lxcProcGetattr,
+    .readdir = lxcProcReaddir,
+    .open    = lxcProcOpen,
+    .read    = lxcProcRead,
+};
+
+void lxcRegisterFuse(void *DomainDef)
+{
+    int argc = 4;
+    char *argv[argc];
+    char *path = NULL;
+    char *name = NULL;
+    virDomainDefPtr def = (virDomainDefPtr) DomainDef;
+
+    if (virAsprintf(&name, "Lxc-%s-fuse", def->name) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    if (virAsprintf(&path, "%s/%s/", LXC_STATE_DIR, def->name) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    if (virFileMakePath(path) < 0) {
+        virReportSystemError(errno, _("Cannot create %s"), path);
+        goto cleanup;
+    }
+
+    argv[0] = name;
+    argv[1] = path;
+    argv[2] = (char *)"-odirect_io";
+    argv[3] = (char *)"-f";
+
+    if (fuse_main(argc, argv, &lxcProcOper, def) < 0)
+        virReportSystemError(errno, "%s", _("Cannot start fuse"));
+
+cleanup:
+    VIR_FREE(name);
+    VIR_FREE(path);
+    return;
+}
+
+void lxcUnregisterFuse(virDomainDefPtr def)
+{
+    char *path = NULL;
+
+    if (virAsprintf(&path, "%s/%s/", LXC_STATE_DIR, def->name) < 0) {
+        virReportOOMError();
+        return;
+    }
+
+    if (umount(path) < 0)
+         virReportSystemError(errno, "%s",
+                              _("umount fuse filesystem failed"));
+
+    VIR_FREE(path);
+}
+
+#else
+void lxcRegisterFuse(void *DomainDef ATTRIBUTE_UNUSED)
+{
+}
+
+void lxcUnregisterFuse(virDomainDefPtr def ATTRIBUTE_UNUSED)
+{
+}
+#endif
diff --git a/src/lxc/lxc_fuse.h b/src/lxc/lxc_fuse.h
new file mode 100644
index 0000000..d60c238
--- /dev/null
+++ b/src/lxc/lxc_fuse.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 Fujitsu Limited.
+ *
+ * lxc_fuse.c: fuse filesystem support for libvirt lxc
+ *
+ * Authors:
+ *  Gao feng <gaofeng at cn.fujitsu.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef LXC_FUSE_H
+#define LXC_FUSE_H
+
+#define FUSE_USE_VERSION 26
+
+#include <config.h>
+#if HAVE_FUSE
+#include <fuse.h>
+#endif
+
+#include "lxc_conf.h"
+#include "util.h"
+#include "memory.h"
+
+extern void lxcRegisterFuse(void *DomainDef);
+extern void lxcUnregisterFuse(virDomainDefPtr def);
+#endif
diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c
index bcd59cb..d5e1822 100644
--- a/src/lxc/lxc_process.c
+++ b/src/lxc/lxc_process.c
@@ -28,6 +28,7 @@
 #include "lxc_process.h"
 #include "lxc_domain.h"
 #include "lxc_container.h"
+#include "lxc_fuse.h"
 #include "datatypes.h"
 #include "virfile.h"
 #include "virpidfile.h"
@@ -232,7 +233,7 @@ static void virLXCProcessCleanup(virLXCDriverPtr driver,
                     NULL, xml, NULL);
         VIR_FREE(xml);
     }
-
+    lxcUnregisterFuse(vm->def);
     /* Stop autodestroy in case guest is restarted */
     virLXCProcessAutoDestroyRemove(driver, vm);
 
-- 
1.7.7.6


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