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Date: Wed, 05 Jul 2023 12:50:28 +0200
From: "Andreas Hindborg (Samsung)" <nmi@...aspace.dk>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: Ming Lei <ming.lei@...hat.com>,
open list <linux-kernel@...r.kernel.org>,
Matias Bjorling <Matias.Bjorling@....com>,
Hans Holmberg <Hans.Holmberg@....com>,
Jens Axboe <axboe@...nel.dk>,
Minwoo Im <minwoo.im.dev@...il.com>,
Aravind Ramesh <Aravind.Ramesh@....com>, gost.dev@...sung.com,
"open list:BLOCK LAYER" <linux-block@...r.kernel.org>,
Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v5 2/5] ublk: move types to shared header file
Damien Le Moal <dlemoal@...nel.org> writes:
> On 7/5/23 01:52, Andreas Hindborg wrote:
>> From: Andreas Hindborg <a.hindborg@...sung.com>
>>
>> This change is in preparation for ublk zoned storage support.
>>
>> Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
>
> A couple of nits below. Otherwise looks OK to me.
>
> Reviewed-by: Damien Le Moal <dlemoal@...nel.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@...r.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
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