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Ensure root filesystem is mounted if a file/block mount.

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For a root filesystem with type=file or type=block, the LXC
container was forgetting to actually mount it, before doing
the pivot root step.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2013-03-22 14:09:41 +00:00
parent 7e1a7444c6
commit 8dbe85886c
1 changed files with 52 additions and 0 deletions
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52
src/lxc/lxc_container.c
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@ -105,6 +105,9 @@ struct __lxc_child_argv {
int handshakefd;
};
static int lxcContainerMountFSBlock(virDomainFSDefPtr fs,
const char *srcprefix);
/*
* reboot(LINUX_REBOOT_CMD_CAD_ON) will return -EINVAL
@ -406,6 +409,51 @@ static int lxcContainerChildMountSort(const void *a, const void *b)
# define MS_SLAVE (1<<19)
#endif
static int lxcContainerPrepareRoot(virDomainDefPtr def,
virDomainFSDefPtr root)
{
char *dst;
char *tmp;
if (root->type == VIR_DOMAIN_FS_TYPE_MOUNT)
return 0;
if (root->type == VIR_DOMAIN_FS_TYPE_FILE) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unexpected root filesystem without loop device"));
return -1;
}
if (root->type != VIR_DOMAIN_FS_TYPE_BLOCK) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Unsupported root filesystem type %s"),
virDomainFSTypeToString(root->type));
return -1;
}
if (virAsprintf(&dst, "%s/%s.root",
LXC_STATE_DIR, def->name) < 0) {
virReportOOMError();
return -1;
}
tmp = root->dst;
root->dst = dst;
if (lxcContainerMountFSBlock(root, "") < 0) {
root->dst = tmp;
VIR_FREE(dst);
return -1;
}
root->dst = tmp;
root->type = VIR_DOMAIN_FS_TYPE_MOUNT;
VIR_FREE(root->src);
root->src = dst;
return 0;
}
static int lxcContainerPivotRoot(virDomainFSDefPtr root)
{
int ret;
@ -1926,6 +1974,10 @@ static int lxcContainerSetupPivotRoot(virDomainDefPtr vmDef,
if (lxcContainerIdentifyCGroups(&mounts, &nmounts, &cgroupRoot) < 0)
goto cleanup;
/* Ensure the root filesystem is mounted */
if (lxcContainerPrepareRoot(vmDef, root) < 0)
goto cleanup;
/* Gives us a private root, leaving all parent OS mounts on /.oldroot */
if (lxcContainerPivotRoot(root) < 0)
goto cleanup;