[libvirt] [PATCH 19/47] vircgroup: extract virCgroupV1BindMount

Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com&gt; --- src/util/vircgroup.c | 102 +------------------------------- src/util/vircgroupbackend.h | 6 ++ src/util/vircgroupv1.c | 113 ++++++++++++++++++++++++++++++++++++ 3 files changed, 120 insertions(+), 101 deletions(-) diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c index f5ae23836f..29faf5fb2c 100644 --- a/src/util/vircgroup.c +++ b/src/util/vircgroup.c @@ -3181,35 +3181,6 @@ virCgroupKillPainfully(virCgroupPtr group) } -static char * -virCgroupIdentifyRoot(virCgroupPtr group) -{ - char *ret = NULL; - size_t i; - - for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) { - char *tmp; - if (!group->controllers[i].mountPoint) - continue; - if (!(tmp = strrchr(group->controllers[i].mountPoint, '/'))) { - virReportError(VIR_ERR_INTERNAL_ERROR, - _("Could not find directory separator in %s"), - group->controllers[i].mountPoint); - return NULL; - } - - if (VIR_STRNDUP(ret, group->controllers[i].mountPoint, - tmp - group->controllers[i].mountPoint) < 0) - return NULL; - return ret; - } - - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", - _("Could not find any mounted controllers")); - return NULL; -} - - /** * virCgroupGetCpuCfsQuota: * @@ -3304,78 +3275,7 @@ int virCgroupBindMount(virCgroupPtr group, const char *oldroot, const char *mountopts) { - size_t i; - VIR_AUTOFREE(char *) opts = NULL; - VIR_AUTOFREE(char *) root = NULL; - - if (!(root = virCgroupIdentifyRoot(group))) - return -1; - - VIR_DEBUG("Mounting cgroups at '%s'", root); - - if (virFileMakePath(root) < 0) { - virReportSystemError(errno, - _("Unable to create directory %s"), - root); - return -1; - } - - if (virAsprintf(&opts, - "mode=755,size=65536%s", mountopts) < 0) - return -1; - - if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, opts) < 0) { - virReportSystemError(errno, - _("Failed to mount %s on %s type %s"), - "tmpfs", root, "tmpfs"); - return -1; - } - - for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) { - if (!group->controllers[i].mountPoint) - continue; - - if (!virFileExists(group->controllers[i].mountPoint)) { - VIR_AUTOFREE(char *) src = NULL; - if (virAsprintf(&src, "%s%s", - oldroot, - group->controllers[i].mountPoint) < 0) - return -1; - - VIR_DEBUG("Create mount point '%s'", - group->controllers[i].mountPoint); - if (virFileMakePath(group->controllers[i].mountPoint) < 0) { - virReportSystemError(errno, - _("Unable to create directory %s"), - group->controllers[i].mountPoint); - return -1; - } - - if (mount(src, group->controllers[i].mountPoint, "none", MS_BIND, - NULL) < 0) { - virReportSystemError(errno, - _("Failed to bind cgroup '%s' on '%s'"), - src, group->controllers[i].mountPoint); - return -1; - } - } - - if (group->controllers[i].linkPoint) { - VIR_DEBUG("Link mount point '%s' to '%s'", - group->controllers[i].mountPoint, - group->controllers[i].linkPoint); - if (symlink(group->controllers[i].mountPoint, - group->controllers[i].linkPoint) < 0) { - virReportSystemError(errno, - _("Unable to symlink directory %s to %s"), - group->controllers[i].mountPoint, - group->controllers[i].linkPoint); - return -1; - } - } - } - - return 0; + return group->backend->bindMount(group, oldroot, mountopts); } diff --git a/src/util/vircgroupbackend.h b/src/util/vircgroupbackend.h index 1964a48ff0..70deb47461 100644 --- a/src/util/vircgroupbackend.h +++ b/src/util/vircgroupbackend.h @@ -118,6 +118,11 @@ typedef int (*virCgroupHasEmptyTasksCB)(virCgroupPtr cgroup, int controller); +typedef int +(*virCgroupBindMountCB)(virCgroupPtr group, + const char *oldroot, + const char *mountopts); + struct _virCgroupBackend { virCgroupBackendType type; @@ -138,6 +143,7 @@ struct _virCgroupBackend { virCgroupRemoveCB remove; virCgroupAddTaskCB addTask; virCgroupHasEmptyTasksCB hasEmptyTasks; + virCgroupBindMountCB bindMount; }; typedef struct _virCgroupBackend virCgroupBackend; typedef virCgroupBackend *virCgroupBackendPtr; diff --git a/src/util/vircgroupv1.c b/src/util/vircgroupv1.c index 57bcb6a685..0514ba392d 100644 --- a/src/util/vircgroupv1.c +++ b/src/util/vircgroupv1.c @@ -24,6 +24,9 @@ # include <mntent.h> #endif #include <sys/stat.h> +#if defined HAVE_SYS_MOUNT_H +# include <sys/mount.h> +#endif #include "internal.h" @@ -754,6 +757,115 @@ virCgroupV1HasEmptyTasks(virCgroupPtr cgroup, } +static char * +virCgroupV1IdentifyRoot(virCgroupPtr group) +{ + char *ret = NULL; + size_t i; + + for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) { + char *tmp; + if (!group->controllers[i].mountPoint) + continue; + if (!(tmp = strrchr(group->controllers[i].mountPoint, '/'))) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Could not find directory separator in %s"), + group->controllers[i].mountPoint); + return NULL; + } + + if (VIR_STRNDUP(ret, group->controllers[i].mountPoint, + tmp - group->controllers[i].mountPoint) < 0) + return NULL; + return ret; + } + + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Could not find any mounted v1 controllers")); + return NULL; +} + + +static int +virCgroupV1BindMount(virCgroupPtr group, + const char *oldroot, + const char *mountopts) +{ + size_t i; + VIR_AUTOFREE(char *) opts = NULL; + VIR_AUTOFREE(char *) root = NULL; + + if (!(root = virCgroupV1IdentifyRoot(group))) + return -1; + + VIR_DEBUG("Mounting cgroups at '%s'", root); + + if (virFileMakePath(root) < 0) { + virReportSystemError(errno, + _("Unable to create directory %s"), + root); + return -1; + } + + if (virAsprintf(&opts, + "mode=755,size=65536%s", mountopts) < 0) + return -1; + + if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, opts) < 0) { + virReportSystemError(errno, + _("Failed to mount %s on %s type %s"), + "tmpfs", root, "tmpfs"); + return -1; + } + + for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) { + if (!group->controllers[i].mountPoint) + continue; + + if (!virFileExists(group->controllers[i].mountPoint)) { + VIR_AUTOFREE(char *) src = NULL; + if (virAsprintf(&src, "%s%s", + oldroot, + group->controllers[i].mountPoint) < 0) + return -1; + + VIR_DEBUG("Create mount point '%s'", + group->controllers[i].mountPoint); + if (virFileMakePath(group->controllers[i].mountPoint) < 0) { + virReportSystemError(errno, + _("Unable to create directory %s"), + group->controllers[i].mountPoint); + return -1; + } + + if (mount(src, group->controllers[i].mountPoint, "none", MS_BIND, + NULL) < 0) { + virReportSystemError(errno, + _("Failed to bind cgroup '%s' on '%s'"), + src, group->controllers[i].mountPoint); + return -1; + } + } + + if (group->controllers[i].linkPoint) { + VIR_DEBUG("Link mount point '%s' to '%s'", + group->controllers[i].mountPoint, + group->controllers[i].linkPoint); + if (symlink(group->controllers[i].mountPoint, + group->controllers[i].linkPoint) < 0) { + virReportSystemError(errno, + _("Unable to symlink directory %s to %s"), + group->controllers[i].mountPoint, + group->controllers[i].linkPoint); + return -1; + } + } + } + + return 0; +} + + virCgroupBackend virCgroupV1Backend = { .type = VIR_CGROUP_BACKEND_TYPE_V1, @@ -773,6 +885,7 @@ virCgroupBackend virCgroupV1Backend = { .remove = virCgroupV1Remove, .addTask = virCgroupV1AddTask, .hasEmptyTasks = virCgroupV1HasEmptyTasks, + .bindMount = virCgroupV1BindMount, }; -- 2.17.1