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[libvirt] [PATCH] Add support for guest bind mounts with LXC



From: "Daniel P. Berrange" <berrange redhat com>

Currently you can configure LXC to bind a host directory to
a guest directory, but not to bind a guest directory to a
guest directory. While the guest container init could do
this itself, allowing it in the libvirt XML means a stricter
SELinux policy can be written
---
 src/conf/domain_conf.c  |    7 +++++--
 src/conf/domain_conf.h  |   11 ++++++-----
 src/lxc/lxc_container.c |    7 +++++++
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a653fe6..8ce122e 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -263,7 +263,8 @@ VIR_ENUM_IMPL(virDomainFS, VIR_DOMAIN_FS_TYPE_LAST,
               "block",
               "file",
               "template",
-              "ram")
+              "ram",
+              "bind")
 
 VIR_ENUM_IMPL(virDomainFSDriverType, VIR_DOMAIN_FS_DRIVER_TYPE_LAST,
               "default",
@@ -4260,7 +4261,8 @@ virDomainFSDefParseXML(xmlNodePtr node,
             if (!source &&
                 xmlStrEqual(cur->name, BAD_CAST "source")) {
 
-                if (def->type == VIR_DOMAIN_FS_TYPE_MOUNT)
+                if (def->type == VIR_DOMAIN_FS_TYPE_MOUNT ||
+                    def->type == VIR_DOMAIN_FS_TYPE_BIND)
                     source = virXMLPropString(cur, "dir");
                 else if (def->type == VIR_DOMAIN_FS_TYPE_FILE)
                     source = virXMLPropString(cur, "file");
@@ -11335,6 +11337,7 @@ virDomainFSDefFormat(virBufferPtr buf,
 
     switch (def->type) {
     case VIR_DOMAIN_FS_TYPE_MOUNT:
+    case VIR_DOMAIN_FS_TYPE_BIND:
         virBufferEscapeString(buf, "      <source dir='%s'/>\n",
                               def->src);
         break;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index b8d9c87..bdb1f75 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -656,11 +656,12 @@ struct _virDomainControllerDef {
 
 /* Two types of disk backends */
 enum virDomainFSType {
-    VIR_DOMAIN_FS_TYPE_MOUNT,   /* Better named 'bind' */
-    VIR_DOMAIN_FS_TYPE_BLOCK,
-    VIR_DOMAIN_FS_TYPE_FILE,
-    VIR_DOMAIN_FS_TYPE_TEMPLATE,
-    VIR_DOMAIN_FS_TYPE_RAM,
+    VIR_DOMAIN_FS_TYPE_MOUNT, /* Mounts (binds) a host dir on a guest dir */
+    VIR_DOMAIN_FS_TYPE_BLOCK, /* Mounts a host block dev on a guest dir */
+    VIR_DOMAIN_FS_TYPE_FILE,  /* Loopback mounts a host file on a guest dir */
+    VIR_DOMAIN_FS_TYPE_TEMPLATE, /* Expands a OS template to a guest dir */
+    VIR_DOMAIN_FS_TYPE_RAM,   /* Mount a RAM filesystem on a guest dir */
+    VIR_DOMAIN_FS_TYPE_BIND,  /* Binds a guest dir to another guest dir */
 
     VIR_DOMAIN_FS_TYPE_LAST
 };
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index b69255e..bf67ba1 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -1025,7 +1025,14 @@ static int lxcContainerMountFS(virDomainFSDefPtr fs,
         if (lxcContainerMountFSTmpfs(fs) < 0)
             return -1;
         break;
+    case VIR_DOMAIN_FS_TYPE_BIND:
+        if (lxcContainerMountFSBind(fs, "") < 0)
+            return -1;
+        break;
     case VIR_DOMAIN_FS_TYPE_FILE:
+        /* We do actually support this, but the lxc controller
+         * should have associated the file with a loopback
+         * device and changed this to TYPE_BLOCK for us */
         lxcError(VIR_ERR_INTERNAL_ERROR,
                  _("Unexpected filesystem type %s"),
                  virDomainFSTypeToString(fs->type));
-- 
1.7.10.2


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