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Message-ID: <da0b6d459785474b92f7bb1893f4a016@SN2PR03MB061.namprd03.prod.outlook.com>
Date: Tue, 12 Mar 2013 18:01:35 +0000
From: KY Srinivasan <kys@...rosoft.com>
To: KY Srinivasan <kys@...rosoft.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
"olaf@...fle.de" <olaf@...fle.de>,
"apw@...onical.com" <apw@...onical.com>,
"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH 1/1] Drivers: hv: Add a new driver to support host
initiated backup
> -----Original Message-----
> From: K. Y. Srinivasan [mailto:kys@...rosoft.com]
> Sent: Tuesday, March 12, 2013 2:29 PM
> To: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com
> 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@...rosoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
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
>
>
--
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