Re: [Libvir] PATCH: 13/16: iSCSI backend

This provides a storage pool using the iSCSI protocol. Since there is no API for iSCSI it is implemented by simply shelling out to the iscsiadm command line tool. A pool corresponds to a single target on the iSCSI server. Starting a pool logs into the server and maps the target's LUNs into the local filesystem. The default nodes are under /dev, allocated-on-demand and thus not guarenteed to be stable across reboots. For this reason it is recommended by the pool target path be configured to point to /dev/disk/by-path or /dev/disk/by-id whose entries are guarenteed stable for lifetime of the target+LUN. The 'refresh' operation will rescan the target for new LUNs and purge old LUNs allowing dynamic updates without needing a pool restart.

diff -r 9a3200af0a3d libvirt.spec.in --- a/libvirt.spec.in Thu Feb 07 11:14:56 2008 -0500 +++ b/libvirt.spec.in Thu Feb 07 11:34:46 2008 -0500 @@ -51,6 +51,8 @@ Requires: /usr/sbin/qcow-create %endif # For LVM drivers Requires: lvm2 +# For ISCSI driver +Requires: iscsi-initiator-utils

+static int virStorageBackendISCSIMakeLUN(virConnectPtr conn, + virStoragePoolObjPtr pool, + char **const groups, + void *data ATTRIBUTE_UNUSED)

+ if ((devpath = malloc(5 + strlen(dev) + 1)) == NULL) { + virStorageReportError(conn, VIR_ERR_NO_MEMORY, "devpath"); + goto cleanup; + } + strcpy(devpath, "/dev/"); + strcat(devpath, dev);