[v5,2/5] ublk: move types to shared header file
Commit Message
From: Andreas Hindborg <a.hindborg@samsung.com>
This change is in preparation for ublk zoned storage support.
Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
---
MAINTAINERS | 1 +
drivers/block/ublk_drv.c | 92 +---------------------------------
drivers/block/ublk_drv.h | 103 +++++++++++++++++++++++++++++++++++++++
3 files changed, 105 insertions(+), 91 deletions(-)
create mode 100644 drivers/block/ublk_drv.h
Comments
On 7/5/23 01:52, Andreas Hindborg wrote:
> From: Andreas Hindborg <a.hindborg@samsung.com>
>
> This change is in preparation for ublk zoned storage support.
>
> Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
A couple of nits below. Otherwise looks OK to me.
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
That said, your patch 5 still adds ublk-zoned.c, which Christoph commented that
this may not be needed given that zone support does not add that much code.
Without introducing this new file, this patch, as well as patch 3 would not be
needed and patch 5 would be simplified a little.
If you really prefer (or Ming does) having the zone code separated, I would
suggest moving the ublk driver under its own "ublk" directory under
drivers/block/ (similarly to nullblk). That would simplify the Kconfig too.
> ---
> MAINTAINERS | 1 +
> drivers/block/ublk_drv.c | 92 +---------------------------------
> drivers/block/ublk_drv.h | 103 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 105 insertions(+), 91 deletions(-)
> create mode 100644 drivers/block/ublk_drv.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 27ef11624748..ace71c90751c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -21554,6 +21554,7 @@ L: linux-block@vger.kernel.org
> S: Maintained
> F: Documentation/block/ublk.rst
> F: drivers/block/ublk_drv.c
> +F: drivers/block/ublk_drv.h
> F: include/uapi/linux/ublk_cmd.h
>
> UCLINUX (M68KNOMMU AND COLDFIRE)
> diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
> index 1c823750c95a..bca0c4e1cfd8 100644
> --- a/drivers/block/ublk_drv.c
> +++ b/drivers/block/ublk_drv.c
> @@ -45,6 +45,7 @@
> #include <linux/namei.h>
> #include <linux/kref.h>
> #include <uapi/linux/ublk_cmd.h>
> +#include "ublk_drv.h"
>
> #define UBLK_MINORS (1U << MINORBITS)
>
> @@ -62,63 +63,11 @@
> #define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | \
> UBLK_PARAM_TYPE_DISCARD | UBLK_PARAM_TYPE_DEVT)
>
> -struct ublk_rq_data {
> - struct llist_node node;
> -
> - struct kref ref;
> -};
>
> struct ublk_uring_cmd_pdu {
> struct ublk_queue *ubq;
> };
>
> -/*
> - * io command is active: sqe cmd is received, and its cqe isn't done
> - *
> - * If the flag is set, the io command is owned by ublk driver, and waited
> - * for incoming blk-mq request from the ublk block device.
> - *
> - * If the flag is cleared, the io command will be completed, and owned by
> - * ublk server.
> - */
> -#define UBLK_IO_FLAG_ACTIVE 0x01
> -
> -/*
> - * IO command is completed via cqe, and it is being handled by ublksrv, and
> - * not committed yet
> - *
> - * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
> - * cross verification
> - */
> -#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
> -
> -/*
> - * IO command is aborted, so this flag is set in case of
> - * !UBLK_IO_FLAG_ACTIVE.
> - *
> - * After this flag is observed, any pending or new incoming request
> - * associated with this io command will be failed immediately
> - */
> -#define UBLK_IO_FLAG_ABORTED 0x04
> -
> -/*
> - * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
> - * get data buffer address from ublksrv.
> - *
> - * Then, bio data could be copied into this data buffer for a WRITE request
> - * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
> - */
> -#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
> -
> -struct ublk_io {
> - /* userspace buffer address from io cmd */
> - __u64 addr;
> - unsigned int flags;
> - int res;
> -
> - struct io_uring_cmd *cmd;
> -};
> -
> struct ublk_queue {
> int q_id;
> int q_depth;
> @@ -140,45 +89,6 @@ struct ublk_queue {
>
> #define UBLK_DAEMON_MONITOR_PERIOD (5 * HZ)
>
> -struct ublk_device {
> - struct gendisk *ub_disk;
> -
> - char *__queues;
> -
> - unsigned int queue_size;
> - struct ublksrv_ctrl_dev_info dev_info;
> -
> - struct blk_mq_tag_set tag_set;
> -
> - struct cdev cdev;
> - struct device cdev_dev;
> -
> -#define UB_STATE_OPEN 0
> -#define UB_STATE_USED 1
> -#define UB_STATE_DELETED 2
> - unsigned long state;
> - int ub_number;
> -
> - struct mutex mutex;
> -
> - spinlock_t mm_lock;
> - struct mm_struct *mm;
> -
> - struct ublk_params params;
> -
> - struct completion completion;
> - unsigned int nr_queues_ready;
> - unsigned int nr_privileged_daemon;
> -
> - /*
> - * Our ubq->daemon may be killed without any notification, so
> - * monitor each queue's daemon periodically
> - */
> - struct delayed_work monitor_work;
> - struct work_struct quiesce_work;
> - struct work_struct stop_work;
> -};
> -
> /* header of ublk_params */
> struct ublk_params_header {
> __u32 len;
> diff --git a/drivers/block/ublk_drv.h b/drivers/block/ublk_drv.h
> new file mode 100644
> index 000000000000..2a4ab721d513
> --- /dev/null
> +++ b/drivers/block/ublk_drv.h
> @@ -0,0 +1,103 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef _UBLK_DRV_H
> +#define _UBLK_DRV_H
Nit: I think you can drop the leading "_".
> +
> +#include <uapi/linux/ublk_cmd.h>
> +#include <linux/blk-mq.h>
> +#include <linux/cdev.h>
> +
> +/*
> + * io command is active: sqe cmd is received, and its cqe isn't done
> + *
> + * If the flag is set, the io command is owned by ublk driver, and waited
> + * for incoming blk-mq request from the ublk block device.
> + *
> + * If the flag is cleared, the io command will be completed, and owned by
> + * ublk server.
> + */
> +#define UBLK_IO_FLAG_ACTIVE 0x01
> +
> +/*
> + * IO command is completed via cqe, and it is being handled by ublksrv, and
> + * not committed yet
> + *
> + * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
> + * cross verification
> + */
> +#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
> +
> +/*
> + * IO command is aborted, so this flag is set in case of
> + * !UBLK_IO_FLAG_ACTIVE.
> + *
> + * After this flag is observed, any pending or new incoming request
> + * associated with this io command will be failed immediately
> + */
> +#define UBLK_IO_FLAG_ABORTED 0x04
> +
> +/*
> + * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
> + * get data buffer address from ublksrv.
> + *
> + * Then, bio data could be copied into this data buffer for a WRITE request
> + * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
> + */
> +#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
> +
> +
Nit: extra blank line not needed.
> +struct ublk_device {
> + struct gendisk *ub_disk;
> +
> + char *__queues;
> +
> + unsigned int queue_size;
> + struct ublksrv_ctrl_dev_info dev_info;
> +
> + struct blk_mq_tag_set tag_set;
> +
> + struct cdev cdev;
> + struct device cdev_dev;
> +
> +#define UB_STATE_OPEN 0
> +#define UB_STATE_USED 1
> +#define UB_STATE_DELETED 2
> + unsigned long state;
> + int ub_number;
> +
> + struct mutex mutex;
> +
> + spinlock_t mm_lock;
> + struct mm_struct *mm;
> +
> + struct ublk_params params;
> +
> + struct completion completion;
> + unsigned int nr_queues_ready;
> + unsigned int nr_privileged_daemon;
> +
> + /*
> + * Our ubq->daemon may be killed without any notification, so
> + * monitor each queue's daemon periodically
> + */
> + struct delayed_work monitor_work;
> + struct work_struct quiesce_work;
> + struct work_struct stop_work;
> +};
> +
> +struct ublk_rq_data {
> + struct llist_node node;
> +
> + struct kref ref;
> +};
> +
> +struct ublk_io {
> + /* userspace buffer address from io cmd */
> + __u64 addr;
> + unsigned int flags;
> + int res;
> +
> + struct io_uring_cmd *cmd;
> +};
> +
> +#endif
Damien Le Moal <dlemoal@kernel.org> writes:
> On 7/5/23 01:52, Andreas Hindborg wrote:
>> From: Andreas Hindborg <a.hindborg@samsung.com>
>>
>> This change is in preparation for ublk zoned storage support.
>>
>> Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
>
> A couple of nits below. Otherwise looks OK to me.
>
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
>
> That said, your patch 5 still adds ublk-zoned.c, which Christoph commented that
> this may not be needed given that zone support does not add that much code.
> Without introducing this new file, this patch, as well as patch 3 would not be
> needed and patch 5 would be simplified a little.
>
> If you really prefer (or Ming does) having the zone code separated, I would
> suggest moving the ublk driver under its own "ublk" directory under
> drivers/block/ (similarly to nullblk). That would simplify the Kconfig too.
I am fine either way. I don't think Ming commented on this. It seems
both you and Christoph prefer just the 1 translation unit, so I might as
well change it back to that.
BR Andreas
>
>> ---
>> MAINTAINERS | 1 +
>> drivers/block/ublk_drv.c | 92 +---------------------------------
>> drivers/block/ublk_drv.h | 103 +++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 105 insertions(+), 91 deletions(-)
>> create mode 100644 drivers/block/ublk_drv.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 27ef11624748..ace71c90751c 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -21554,6 +21554,7 @@ L: linux-block@vger.kernel.org
>> S: Maintained
>> F: Documentation/block/ublk.rst
>> F: drivers/block/ublk_drv.c
>> +F: drivers/block/ublk_drv.h
>> F: include/uapi/linux/ublk_cmd.h
>>
>> UCLINUX (M68KNOMMU AND COLDFIRE)
>> diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
>> index 1c823750c95a..bca0c4e1cfd8 100644
>> --- a/drivers/block/ublk_drv.c
>> +++ b/drivers/block/ublk_drv.c
>> @@ -45,6 +45,7 @@
>> #include <linux/namei.h>
>> #include <linux/kref.h>
>> #include <uapi/linux/ublk_cmd.h>
>> +#include "ublk_drv.h"
>>
>> #define UBLK_MINORS (1U << MINORBITS)
>>
>> @@ -62,63 +63,11 @@
>> #define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | \
>> UBLK_PARAM_TYPE_DISCARD | UBLK_PARAM_TYPE_DEVT)
>>
>> -struct ublk_rq_data {
>> - struct llist_node node;
>> -
>> - struct kref ref;
>> -};
>>
>> struct ublk_uring_cmd_pdu {
>> struct ublk_queue *ubq;
>> };
>>
>> -/*
>> - * io command is active: sqe cmd is received, and its cqe isn't done
>> - *
>> - * If the flag is set, the io command is owned by ublk driver, and waited
>> - * for incoming blk-mq request from the ublk block device.
>> - *
>> - * If the flag is cleared, the io command will be completed, and owned by
>> - * ublk server.
>> - */
>> -#define UBLK_IO_FLAG_ACTIVE 0x01
>> -
>> -/*
>> - * IO command is completed via cqe, and it is being handled by ublksrv, and
>> - * not committed yet
>> - *
>> - * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
>> - * cross verification
>> - */
>> -#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
>> -
>> -/*
>> - * IO command is aborted, so this flag is set in case of
>> - * !UBLK_IO_FLAG_ACTIVE.
>> - *
>> - * After this flag is observed, any pending or new incoming request
>> - * associated with this io command will be failed immediately
>> - */
>> -#define UBLK_IO_FLAG_ABORTED 0x04
>> -
>> -/*
>> - * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
>> - * get data buffer address from ublksrv.
>> - *
>> - * Then, bio data could be copied into this data buffer for a WRITE request
>> - * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
>> - */
>> -#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
>> -
>> -struct ublk_io {
>> - /* userspace buffer address from io cmd */
>> - __u64 addr;
>> - unsigned int flags;
>> - int res;
>> -
>> - struct io_uring_cmd *cmd;
>> -};
>> -
>> struct ublk_queue {
>> int q_id;
>> int q_depth;
>> @@ -140,45 +89,6 @@ struct ublk_queue {
>>
>> #define UBLK_DAEMON_MONITOR_PERIOD (5 * HZ)
>>
>> -struct ublk_device {
>> - struct gendisk *ub_disk;
>> -
>> - char *__queues;
>> -
>> - unsigned int queue_size;
>> - struct ublksrv_ctrl_dev_info dev_info;
>> -
>> - struct blk_mq_tag_set tag_set;
>> -
>> - struct cdev cdev;
>> - struct device cdev_dev;
>> -
>> -#define UB_STATE_OPEN 0
>> -#define UB_STATE_USED 1
>> -#define UB_STATE_DELETED 2
>> - unsigned long state;
>> - int ub_number;
>> -
>> - struct mutex mutex;
>> -
>> - spinlock_t mm_lock;
>> - struct mm_struct *mm;
>> -
>> - struct ublk_params params;
>> -
>> - struct completion completion;
>> - unsigned int nr_queues_ready;
>> - unsigned int nr_privileged_daemon;
>> -
>> - /*
>> - * Our ubq->daemon may be killed without any notification, so
>> - * monitor each queue's daemon periodically
>> - */
>> - struct delayed_work monitor_work;
>> - struct work_struct quiesce_work;
>> - struct work_struct stop_work;
>> -};
>> -
>> /* header of ublk_params */
>> struct ublk_params_header {
>> __u32 len;
>> diff --git a/drivers/block/ublk_drv.h b/drivers/block/ublk_drv.h
>> new file mode 100644
>> index 000000000000..2a4ab721d513
>> --- /dev/null
>> +++ b/drivers/block/ublk_drv.h
>> @@ -0,0 +1,103 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +
>> +#ifndef _UBLK_DRV_H
>> +#define _UBLK_DRV_H
>
> Nit: I think you can drop the leading "_".
>
>> +
>> +#include <uapi/linux/ublk_cmd.h>
>> +#include <linux/blk-mq.h>
>> +#include <linux/cdev.h>
>> +
>> +/*
>> + * io command is active: sqe cmd is received, and its cqe isn't done
>> + *
>> + * If the flag is set, the io command is owned by ublk driver, and waited
>> + * for incoming blk-mq request from the ublk block device.
>> + *
>> + * If the flag is cleared, the io command will be completed, and owned by
>> + * ublk server.
>> + */
>> +#define UBLK_IO_FLAG_ACTIVE 0x01
>> +
>> +/*
>> + * IO command is completed via cqe, and it is being handled by ublksrv, and
>> + * not committed yet
>> + *
>> + * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
>> + * cross verification
>> + */
>> +#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
>> +
>> +/*
>> + * IO command is aborted, so this flag is set in case of
>> + * !UBLK_IO_FLAG_ACTIVE.
>> + *
>> + * After this flag is observed, any pending or new incoming request
>> + * associated with this io command will be failed immediately
>> + */
>> +#define UBLK_IO_FLAG_ABORTED 0x04
>> +
>> +/*
>> + * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
>> + * get data buffer address from ublksrv.
>> + *
>> + * Then, bio data could be copied into this data buffer for a WRITE request
>> + * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
>> + */
>> +#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
>> +
>> +
>
> Nit: extra blank line not needed.
>
>> +struct ublk_device {
>> + struct gendisk *ub_disk;
>> +
>> + char *__queues;
>> +
>> + unsigned int queue_size;
>> + struct ublksrv_ctrl_dev_info dev_info;
>> +
>> + struct blk_mq_tag_set tag_set;
>> +
>> + struct cdev cdev;
>> + struct device cdev_dev;
>> +
>> +#define UB_STATE_OPEN 0
>> +#define UB_STATE_USED 1
>> +#define UB_STATE_DELETED 2
>> + unsigned long state;
>> + int ub_number;
>> +
>> + struct mutex mutex;
>> +
>> + spinlock_t mm_lock;
>> + struct mm_struct *mm;
>> +
>> + struct ublk_params params;
>> +
>> + struct completion completion;
>> + unsigned int nr_queues_ready;
>> + unsigned int nr_privileged_daemon;
>> +
>> + /*
>> + * Our ubq->daemon may be killed without any notification, so
>> + * monitor each queue's daemon periodically
>> + */
>> + struct delayed_work monitor_work;
>> + struct work_struct quiesce_work;
>> + struct work_struct stop_work;
>> +};
>> +
>> +struct ublk_rq_data {
>> + struct llist_node node;
>> +
>> + struct kref ref;
>> +};
>> +
>> +struct ublk_io {
>> + /* userspace buffer address from io cmd */
>> + __u64 addr;
>> + unsigned int flags;
>> + int res;
>> +
>> + struct io_uring_cmd *cmd;
>> +};
>> +
>> +#endif
@@ -21554,6 +21554,7 @@ L: linux-block@vger.kernel.org
S: Maintained
F: Documentation/block/ublk.rst
F: drivers/block/ublk_drv.c
+F: drivers/block/ublk_drv.h
F: include/uapi/linux/ublk_cmd.h
UCLINUX (M68KNOMMU AND COLDFIRE)
@@ -45,6 +45,7 @@
#include <linux/namei.h>
#include <linux/kref.h>
#include <uapi/linux/ublk_cmd.h>
+#include "ublk_drv.h"
#define UBLK_MINORS (1U << MINORBITS)
@@ -62,63 +63,11 @@
#define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | \
UBLK_PARAM_TYPE_DISCARD | UBLK_PARAM_TYPE_DEVT)
-struct ublk_rq_data {
- struct llist_node node;
-
- struct kref ref;
-};
struct ublk_uring_cmd_pdu {
struct ublk_queue *ubq;
};
-/*
- * io command is active: sqe cmd is received, and its cqe isn't done
- *
- * If the flag is set, the io command is owned by ublk driver, and waited
- * for incoming blk-mq request from the ublk block device.
- *
- * If the flag is cleared, the io command will be completed, and owned by
- * ublk server.
- */
-#define UBLK_IO_FLAG_ACTIVE 0x01
-
-/*
- * IO command is completed via cqe, and it is being handled by ublksrv, and
- * not committed yet
- *
- * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
- * cross verification
- */
-#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
-
-/*
- * IO command is aborted, so this flag is set in case of
- * !UBLK_IO_FLAG_ACTIVE.
- *
- * After this flag is observed, any pending or new incoming request
- * associated with this io command will be failed immediately
- */
-#define UBLK_IO_FLAG_ABORTED 0x04
-
-/*
- * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
- * get data buffer address from ublksrv.
- *
- * Then, bio data could be copied into this data buffer for a WRITE request
- * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
- */
-#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
-
-struct ublk_io {
- /* userspace buffer address from io cmd */
- __u64 addr;
- unsigned int flags;
- int res;
-
- struct io_uring_cmd *cmd;
-};
-
struct ublk_queue {
int q_id;
int q_depth;
@@ -140,45 +89,6 @@ struct ublk_queue {
#define UBLK_DAEMON_MONITOR_PERIOD (5 * HZ)
-struct ublk_device {
- struct gendisk *ub_disk;
-
- char *__queues;
-
- unsigned int queue_size;
- struct ublksrv_ctrl_dev_info dev_info;
-
- struct blk_mq_tag_set tag_set;
-
- struct cdev cdev;
- struct device cdev_dev;
-
-#define UB_STATE_OPEN 0
-#define UB_STATE_USED 1
-#define UB_STATE_DELETED 2
- unsigned long state;
- int ub_number;
-
- struct mutex mutex;
-
- spinlock_t mm_lock;
- struct mm_struct *mm;
-
- struct ublk_params params;
-
- struct completion completion;
- unsigned int nr_queues_ready;
- unsigned int nr_privileged_daemon;
-
- /*
- * Our ubq->daemon may be killed without any notification, so
- * monitor each queue's daemon periodically
- */
- struct delayed_work monitor_work;
- struct work_struct quiesce_work;
- struct work_struct stop_work;
-};
-
/* header of ublk_params */
struct ublk_params_header {
__u32 len;
new file mode 100644
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _UBLK_DRV_H
+#define _UBLK_DRV_H
+
+#include <uapi/linux/ublk_cmd.h>
+#include <linux/blk-mq.h>
+#include <linux/cdev.h>
+
+/*
+ * io command is active: sqe cmd is received, and its cqe isn't done
+ *
+ * If the flag is set, the io command is owned by ublk driver, and waited
+ * for incoming blk-mq request from the ublk block device.
+ *
+ * If the flag is cleared, the io command will be completed, and owned by
+ * ublk server.
+ */
+#define UBLK_IO_FLAG_ACTIVE 0x01
+
+/*
+ * IO command is completed via cqe, and it is being handled by ublksrv, and
+ * not committed yet
+ *
+ * Basically exclusively with UBLK_IO_FLAG_ACTIVE, so can be served for
+ * cross verification
+ */
+#define UBLK_IO_FLAG_OWNED_BY_SRV 0x02
+
+/*
+ * IO command is aborted, so this flag is set in case of
+ * !UBLK_IO_FLAG_ACTIVE.
+ *
+ * After this flag is observed, any pending or new incoming request
+ * associated with this io command will be failed immediately
+ */
+#define UBLK_IO_FLAG_ABORTED 0x04
+
+/*
+ * UBLK_IO_FLAG_NEED_GET_DATA is set because IO command requires
+ * get data buffer address from ublksrv.
+ *
+ * Then, bio data could be copied into this data buffer for a WRITE request
+ * after the IO command is issued again and UBLK_IO_FLAG_NEED_GET_DATA is unset.
+ */
+#define UBLK_IO_FLAG_NEED_GET_DATA 0x08
+
+
+struct ublk_device {
+ struct gendisk *ub_disk;
+
+ char *__queues;
+
+ unsigned int queue_size;
+ struct ublksrv_ctrl_dev_info dev_info;
+
+ struct blk_mq_tag_set tag_set;
+
+ struct cdev cdev;
+ struct device cdev_dev;
+
+#define UB_STATE_OPEN 0
+#define UB_STATE_USED 1
+#define UB_STATE_DELETED 2
+ unsigned long state;
+ int ub_number;
+
+ struct mutex mutex;
+
+ spinlock_t mm_lock;
+ struct mm_struct *mm;
+
+ struct ublk_params params;
+
+ struct completion completion;
+ unsigned int nr_queues_ready;
+ unsigned int nr_privileged_daemon;
+
+ /*
+ * Our ubq->daemon may be killed without any notification, so
+ * monitor each queue's daemon periodically
+ */
+ struct delayed_work monitor_work;
+ struct work_struct quiesce_work;
+ struct work_struct stop_work;
+};
+
+struct ublk_rq_data {
+ struct llist_node node;
+
+ struct kref ref;
+};
+
+struct ublk_io {
+ /* userspace buffer address from io cmd */
+ __u64 addr;
+ unsigned int flags;
+ int res;
+
+ struct io_uring_cmd *cmd;
+};
+
+#endif