This driver supports host initiated backup of the guest. On Windows guests, the host can generate application consistent backups using the Windows VSS framework. On Linux, we ensure that the backup will be file system consistent. This driver allows the host to initiate a "Freeze" operation on all the mounted file systems in the guest. Once the mounted file systems in the guest are frozen, the host snapshots the guest's file systems. Once this is done, the guest's file systems are "thawed". This driver has a user-level component (daemon) that invokes the appropriate operation on all the mounted file systems in response to the requests from the host. The duration for which the guest is frozen is very short - a few seconds. During this interval, the diff disk is comitted. In this version of the patch I have addressed the feedback from Olaf Herring. Also, some of the connector related issues have been fixed.
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| @@ -44,8 +44,11 @@ · 43 unmodified lines | ||
| 44 | 44 | #define CN_VAL_DRBD 0x1 |
| 45 | 45 | #define CN_KVP_IDX 0x9 /* HyperV KVP */ |
| 46 | 46 | #define CN_KVP_VAL 0x1 /* queries from the kernel */ |
| 47 | +#define CN_VSS_IDX 0xA /* HyperV VSS */ | |
| 48 | +#define CN_VSS_VAL 0x1 /* queries from the kernel */ | |
| 47 | 49 | |
| 48 | −#define CN_NETLINK_USERS 10 /* Highest index + 1 */ | |
| 50 | + | |
| 51 | +#define CN_NETLINK_USERS 11 /* Highest index + 1 */ | |
| 49 | 52 | |
| 50 | 53 | /* |
| 51 | 54 | * Maximum connector's message size. |