From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
The LXC driver can already configure <disk> or <filesystem>
devices to use the loop device. This extends it to also allow
for use of the NBD device, to support non-raw formats.
Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
src/lxc/lxc_controller.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 78 insertions(+), 2 deletions(-)
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index 0f90e72..d92b722 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -389,6 +389,62 @@ static int virLXCControllerSetupLoopDeviceDisk(virDomainDiskDefPtr disk)
}
+static int virLXCControllerSetupNBDDeviceFS(virDomainFSDefPtr fs)
+{
+ char *dev;
+
+ if (fs->format <= VIR_STORAGE_FILE_NONE) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("An explicit disk format must be specified"));
+ return -1;
+ }
+
+ if (virFileNBDDeviceAssociate(fs->src,
+ fs->format,
+ fs->readonly,
+ &dev) < 0)
+ return -1;
+
+ /*
+ * We now change it into a block device type, so that
+ * the rest of container setup 'just works'
+ */
+ fs->type = VIR_DOMAIN_DISK_TYPE_BLOCK;
+ VIR_FREE(fs->src);
+ fs->src = dev;
+
+ return 0;
+}
+
+
+static int virLXCControllerSetupNBDDeviceDisk(virDomainDiskDefPtr disk)
+{
+ char *dev;
+
+ if (disk->format <= VIR_STORAGE_FILE_NONE) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("An explicit disk format must be specified"));
+ return -1;
+ }
+
+ if (virFileNBDDeviceAssociate(disk->src,
+ disk->format,
+ disk->readonly,
+ &dev) < 0)
+ return -1;
+
+ /*
+ * We now change it into a block device type, so that
+ * the rest of container setup 'just works'
+ */
+ disk->type = VIR_DOMAIN_DISK_TYPE_BLOCK;
+ VIR_FREE(disk->src);
+ disk->src = dev;
+
+ return 0;
+}
+
+
static int virLXCControllerSetupLoopDevices(virLXCControllerPtr ctrl)
{
size_t i;
@@ -421,6 +477,9 @@ static int virLXCControllerSetupLoopDevices(virLXCControllerPtr ctrl)
goto cleanup;
}
ctrl->loopDevFds[ctrl->nloopDevs - 1] = fd;
+ } else if (fs->fsdriver == VIR_DOMAIN_FS_DRIVER_TYPE_NBD) {
+ if (virLXCControllerSetupNBDDeviceFS(fs) < 0)
+ goto cleanup;
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("fs driver %s is not supported"),
@@ -435,8 +494,14 @@ static int virLXCControllerSetupLoopDevices(virLXCControllerPtr ctrl)
if (disk->type != VIR_DOMAIN_DISK_TYPE_FILE)
continue;
- if (!disk->driverName ||
- STREQ(disk->driverName, "loop")) {
+ /* If no driverName is set, we prefer 'loop' for
+ * dealing with raw or undefined formats, otherwise
+ * we use 'nbd'.
+ */
+ if (STREQ_NULLABLE(disk->driverName, "loop") ||
+ (!disk->driverName &&
+ (disk->format == VIR_STORAGE_FILE_RAW ||
+ disk->format == VIR_STORAGE_FILE_NONE))) {
if (disk->format != VIR_STORAGE_FILE_RAW &&
disk->format != VIR_STORAGE_FILE_NONE) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@@ -460,6 +525,17 @@ static int virLXCControllerSetupLoopDevices(virLXCControllerPtr ctrl)
goto cleanup;
}
ctrl->loopDevFds[ctrl->nloopDevs - 1] = fd;
+ } else if (STREQ_NULLABLE(disk->driverName, "nbd") ||
+ !disk->driverName) {
+ if (disk->cachemode != VIR_DOMAIN_DISK_CACHE_DEFAULT &&
+ disk->cachemode != VIR_DOMAIN_DISK_CACHE_DISABLE) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Disk cache mode %s is not supported"),
+ virDomainDiskCacheTypeToString(disk->cachemode));
+ goto cleanup;
+ }
+ if (virLXCControllerSetupNBDDeviceDisk(disk) < 0)
+ goto cleanup;
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("disk driver %s is not supported"),
--
1.8.2.1
--
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