Re: [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(a)cn.fujitsu.com&gt;

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 @@ -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; + } +

+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_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);