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Support NBD backed disks/filesystems in LXC driver

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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@redhat.com>
This commit is contained in:
Daniel P. Berrange 2013-04-22 15:06:18 +01:00
parent 13579d4544
commit 6b5f12c805
1 changed files with 78 additions and 2 deletions
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80
src/lxc/lxc_controller.c
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@ -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"),