This is first in a series of patch-sets aimed at cleaning up the storage drivers for Hyper-V. Before I get into the details of this patch-set, I think it is useful to give a brief overview of the storage related front-end drivers currently in the tree for Linux on Hyper-V: On the host side, Windows emulates the standard PC hardware to permit hosting of fully virtualized operating systems. To enhance disk I/O performance, we support a virtual block driver. This block driver currently handles disks that have been setup as IDE disks for the guest - as specified in the guest configuration. On the SCSI side, we emulate a SCSI HBA. Devices configured under the SCSI controller for the guest are handled via this emulated HBA (SCSI front-end). So, SCSI disks configured for the guest are handled through native SCSI upper-level drivers. If this SCSI front-end driver is not loaded, currently, the guest cannot see devices that have been configured as SCSI devices. So, while the virtual block driver described earlier could potentially handle all block devices, the implementation choices made on the host may not permit it. Also, the only SCSI device that can be currently configured for the guest is a disk device. Both the block device driver (hv_blkvsc) and the SCSI front-end driver (hv_storvsc) communicate with the host via unique channels that are implemented as bi-directional ring-buffers. Each (storage) channel carries with it enough state to uniquely identify the device on the host side. Microsoft has chosen to use SCSI verbs for this storage channel communication. In this patch-set I have addressed the following issues in the Hyper-V storage drivers (virtual block and SCSI front-end): 1) Get rid of the inclusion of storvsc.c from blockvsc.c 2) Cleanup storvsc.c 3) Get rid of the file blkvsc.c 4) Cleanup the initialization sequence for both block and SCSI front-end drivers. Regards, K. Y _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
