> -----Original Message----- > From: K. Y. Srinivasan [mailto:kys@xxxxxxxxxxxxx] > Sent: Tuesday, March 12, 2013 2:29 PM > To: gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx; > jasowang@xxxxxxxxxx > Cc: KY Srinivasan > Subject: [PATCH 1/1] Drivers: hv: Add a new driver to support host initiated > backup > > 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. > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Greg, Please drop this patch. I sent the wrong patch. K. Y > --- > drivers/hv/Makefile | 2 +- > drivers/hv/hv_util.c | 10 ++++++ > include/linux/hyperv.h | 69 > ++++++++++++++++++++++++++++++++++++++++ > include/uapi/linux/connector.h | 5 ++- > 4 files changed, 84 insertions(+), 2 deletions(-) > > diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile > index e6abfa0..0a74b56 100644 > --- a/drivers/hv/Makefile > +++ b/drivers/hv/Makefile > @@ -5,4 +5,4 @@ obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o > hv_vmbus-y := vmbus_drv.o \ > hv.o connection.o channel.o \ > channel_mgmt.o ring_buffer.o > -hv_utils-y := hv_util.o hv_kvp.o > +hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o > diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c > index 1d4cbd8..2f561c5 100644 > --- a/drivers/hv/hv_util.c > +++ b/drivers/hv/hv_util.c > @@ -49,6 +49,12 @@ static struct hv_util_service util_kvp = { > .util_deinit = hv_kvp_deinit, > }; > > +static struct hv_util_service util_vss = { > + .util_cb = hv_vss_onchannelcallback, > + .util_init = hv_vss_init, > + .util_deinit = hv_vss_deinit, > +}; > + > static void perform_shutdown(struct work_struct *dummy) > { > orderly_poweroff(true); > @@ -339,6 +345,10 @@ static const struct hv_vmbus_device_id id_table[] = { > { HV_KVP_GUID, > .driver_data = (unsigned long)&util_kvp > }, > + /* VSS GUID */ > + { HV_VSS_GUID, > + .driver_data = (unsigned long)&util_vss > + }, > { }, > }; > > diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h > index df77ba9..95d0850 100644 > --- a/include/linux/hyperv.h > +++ b/include/linux/hyperv.h > @@ -27,6 +27,63 @@ > > #include <linux/types.h> > > + > +/* > + * Implementation of host controlled snapshot of the guest. > + */ > + > +#define VSS_OP_REGISTER 128 > + > +enum hv_vss_op { > + VSS_OP_CREATE = 0, > + VSS_OP_DELETE, > + VSS_OP_HOT_BACKUP, > + VSS_OP_GET_DM_INFO, > + VSS_OP_BU_COMPLETE, > + /* > + * Following operations are only supported with IC version >= 5.0 > + */ > + VSS_OP_FREEZE, /* Freeze the file systems in the VM */ > + VSS_OP_THAW, /* Unfreeze the file systems */ > + VSS_OP_AUTO_RECOVER, > + VSS_OP_COUNT /* Number of operations, must be last */ > +}; > + > + > +/* > + * Header for all VSS messages. > + */ > +struct hv_vss_hdr { > + __u8 operation; > + __u8 reserved[7]; > +} __attribute__((packed)); > + > + > +/* > + * Flag values for the hv_vss_check_feature. Linux supports only > + * one value. > + */ > +#define VSS_HBU_NO_AUTO_RECOVERY 0x00000005 > + > +struct hv_vss_check_feature { > + __u32 flags; > +} __attribute__((packed)); > + > +struct hv_vss_check_dm_info { > + __u32 flags; > +} __attribute__((packed)); > + > +struct hv_vss_msg { > + union { > + struct hv_vss_hdr vss_hdr; > + int error; > + }; > + union { > + struct hv_vss_check_feature vss_cf; > + struct hv_vss_check_dm_info dm_info; > + }; > +} __attribute__((packed)); > + > /* > * An implementation of HyperV key value pair (KVP) functionality for Linux. > * > @@ -1253,6 +1310,14 @@ void vmbus_driver_unregister(struct hv_driver > *hv_driver); > } > > /* > + * VSS (Backup/Restore) GUID > + */ > +#define HV_VSS_GUID \ > + .guid = { \ > + 0x29, 0x2e, 0xfa, 0x35, 0x23, 0xea, 0x36, 0x42, \ > + 0x96, 0xae, 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40 \ > + } > +/* > * Common header for Hyper-V ICs > */ > > @@ -1356,6 +1421,10 @@ int hv_kvp_init(struct hv_util_service *); > void hv_kvp_deinit(void); > void hv_kvp_onchannelcallback(void *); > > +int hv_vss_init(struct hv_util_service *); > +void hv_vss_deinit(void); > +void hv_vss_onchannelcallback(void *); > + > /* > * Negotiated version with the Host. > */ > diff --git a/include/uapi/linux/connector.h b/include/uapi/linux/connector.h > index 8761a03..4cb2835 100644 > --- a/include/uapi/linux/connector.h > +++ b/include/uapi/linux/connector.h > @@ -44,8 +44,11 @@ > #define CN_VAL_DRBD 0x1 > #define CN_KVP_IDX 0x9 /* HyperV KVP */ > #define CN_KVP_VAL 0x1 /* queries from the kernel */ > +#define CN_VSS_IDX 0xA /* HyperV VSS */ > +#define CN_VSS_VAL 0x1 /* queries from the kernel */ > > -#define CN_NETLINK_USERS 10 /* Highest index + 1 */ > + > +#define CN_NETLINK_USERS 11 /* Highest index + 1 */ > > /* > * Maximum connector's message size. > -- > 1.7.4.1 > > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
