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Date:   Sat, 24 Dec 2022 10:53:53 +0100
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Jens Axboe <axboe@kernel.dk>, linux-kernel@vger.kernel.org,
        Christoph Hellwig <hch@infradead.org>,
        Thomas Maier <balagi@justmail.de>,
        Peter Osterlund <petero2@telia.com>,
        linux-block@vger.kernel.org
Subject: Re: [PATCH] pktcdvd: remove driver.
Message-ID: <20221224095353.w32xhmyzlft6qi4v@pali>
References: <20221202182758.1339039-1-gregkh@linuxfoundation.org>
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In-Reply-To: <20221202182758.1339039-1-gregkh@linuxfoundation.org>
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On Friday 02 December 2022 19:27:58 Greg Kroah-Hartman wrote:
> Way back in 2016 in commit 5a8b187c61e9 ("pktcdvd: mark as unmaintained
> and deprecated") this driver was marked as "will be removed soon".  5
> years seems long enough to have it stick around after that, so finally
> remove the thing now.

Why to remove? This driver is still widely used, userspace in active
maintenance and in last two years userspace software received more fixes
for CD-RW support and pktcdvd.

Just now community person informed me that somebody is going to remove
kernel support.

> Reported-by: Christoph Hellwig <hch@infradead.org>
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: Thomas Maier <balagi@justmail.de>
> Cc: Peter Osterlund <petero2@telia.com>
> Cc: linux-block@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  Documentation/ABI/testing/debugfs-pktcdvd     |   18 -
>  Documentation/ABI/testing/sysfs-class-pktcdvd |   97 -
>  MAINTAINERS                                   |    7 -
>  drivers/block/Kconfig                         |   43 -
>  drivers/block/Makefile                        |    1 -
>  drivers/block/pktcdvd.c                       | 2944 -----------------
>  include/linux/pktcdvd.h                       |  197 --
>  include/uapi/linux/pktcdvd.h                  |  112 -
>  8 files changed, 3419 deletions(-)
>  delete mode 100644 Documentation/ABI/testing/debugfs-pktcdvd
>  delete mode 100644 Documentation/ABI/testing/sysfs-class-pktcdvd
>  delete mode 100644 drivers/block/pktcdvd.c
>  delete mode 100644 include/linux/pktcdvd.h
>  delete mode 100644 include/uapi/linux/pktcdvd.h
> 
> diff --git a/Documentation/ABI/testing/debugfs-pktcdvd b/Documentation/ABI/testing/debugfs-pktcdvd
> deleted file mode 100644
> index f6f65a4faea0..000000000000
> --- a/Documentation/ABI/testing/debugfs-pktcdvd
> +++ /dev/null
> @@ -1,18 +0,0 @@
> -What:           /sys/kernel/debug/pktcdvd/pktcdvd[0-7]
> -Date:           Oct. 2006
> -KernelVersion:  2.6.20
> -Contact:        Thomas Maier <balagi@justmail.de>
> -Description:
> -
> -The pktcdvd module (packet writing driver) creates
> -these files in debugfs:
> -
> -/sys/kernel/debug/pktcdvd/pktcdvd[0-7]/
> -
> -    ====            ====== ====================================
> -    info            0444   Lots of driver statistics and infos.
> -    ====            ====== ====================================
> -
> -Example::
> -
> -    cat /sys/kernel/debug/pktcdvd/pktcdvd0/info
> diff --git a/Documentation/ABI/testing/sysfs-class-pktcdvd b/Documentation/ABI/testing/sysfs-class-pktcdvd
> deleted file mode 100644
> index ba1ce626591d..000000000000
> --- a/Documentation/ABI/testing/sysfs-class-pktcdvd
> +++ /dev/null
> @@ -1,97 +0,0 @@
> -sysfs interface
> ----------------
> -The pktcdvd module (packet writing driver) creates the following files in the
> -sysfs: (<devid> is in the format major:minor)
> -
> -What:		/sys/class/pktcdvd/add
> -What:		/sys/class/pktcdvd/remove
> -What:		/sys/class/pktcdvd/device_map
> -Date:		Oct. 2006
> -KernelVersion:	2.6.20
> -Contact:	Thomas Maier <balagi@justmail.de>
> -Description:
> -
> -		==========	==============================================
> -		add		(WO) Write a block device id (major:minor) to
> -				create a new pktcdvd device and map it to the
> -				block device.
> -
> -		remove		(WO) Write the pktcdvd device id (major:minor)
> -				to remove the pktcdvd device.
> -
> -		device_map	(RO) Shows the device mapping in format:
> -				pktcdvd[0-7] <pktdevid> <blkdevid>
> -		==========	==============================================
> -
> -
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/dev
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/uevent
> -Date:		Oct. 2006
> -KernelVersion:	2.6.20
> -Contact:	Thomas Maier <balagi@justmail.de>
> -Description:
> -		dev:	(RO) Device id
> -
> -		uevent:	(WO) To send a uevent
> -
> -
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
> -Date:		Oct. 2006
> -KernelVersion:	2.6.20
> -Contact:	Thomas Maier <balagi@justmail.de>
> -Description:
> -		packets_started:	(RO) Number of started packets.
> -
> -		packets_finished:	(RO) Number of finished packets.
> -
> -		kb_written:		(RO) kBytes written.
> -
> -		kb_read:		(RO) kBytes read.
> -
> -		kb_read_gather:		(RO) kBytes read to fill write packets.
> -
> -		reset:			(WO) Write any value to it to reset
> -					pktcdvd device statistic values, like
> -					bytes read/written.
> -
> -
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
> -What:		/sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
> -Date:		Oct. 2006
> -KernelVersion:	2.6.20
> -Contact:	Thomas Maier <balagi@justmail.de>
> -Description:
> -		==============	================================================
> -		size		(RO) Contains the size of the bio write queue.
> -
> -		congestion_off	(RW) If bio write queue size is below this mark,
> -				accept new bio requests from the block layer.
> -
> -		congestion_on	(RW) If bio write queue size is higher as this
> -				mark, do no longer accept bio write requests
> -				from the block layer and wait till the pktcdvd
> -				device has processed enough bio's so that bio
> -				write queue size is below congestion off mark.
> -				A value of <= 0 disables congestion control.
> -		==============	================================================
> -
> -
> -Example:
> ---------
> -To use the pktcdvd sysfs interface directly, you can do::
> -
> -    # create a new pktcdvd device mapped to /dev/hdc
> -    echo "22:0" >/sys/class/pktcdvd/add
> -    cat /sys/class/pktcdvd/device_map
> -    # assuming device pktcdvd0 was created, look at stat's
> -    cat /sys/class/pktcdvd/pktcdvd0/stat/kb_written
> -    # print the device id of the mapped block device
> -    fgrep pktcdvd0 /sys/class/pktcdvd/device_map
> -    # remove device, using pktcdvd0 device id   253:0
> -    echo "253:0" >/sys/class/pktcdvd/remove
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2585e7edc335..42c215c59f89 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -16379,13 +16379,6 @@ S:	Supported
>  F:	Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
>  F:	drivers/input/keyboard/pinephone-keyboard.c
>  
> -PKTCDVD DRIVER
> -M:	linux-block@vger.kernel.org
> -S:	Orphan
> -F:	drivers/block/pktcdvd.c
> -F:	include/linux/pktcdvd.h
> -F:	include/uapi/linux/pktcdvd.h
> -
>  PLANTOWER PMS7003 AIR POLLUTION SENSOR DRIVER
>  M:	Tomasz Duszynski <tduszyns@gmail.com>
>  S:	Maintained
> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> index a41145d52de9..a2184b428493 100644
> --- a/drivers/block/Kconfig
> +++ b/drivers/block/Kconfig
> @@ -285,49 +285,6 @@ config BLK_DEV_RAM_SIZE
>  	  The default value is 4096 kilobytes. Only change this if you know
>  	  what you are doing.
>  
> -config CDROM_PKTCDVD
> -	tristate "Packet writing on CD/DVD media (DEPRECATED)"
> -	depends on !UML
> -	depends on SCSI
> -	select CDROM
> -	help
> -	  Note: This driver is deprecated and will be removed from the
> -	  kernel in the near future!
> -
> -	  If you have a CDROM/DVD drive that supports packet writing, say
> -	  Y to include support. It should work with any MMC/Mt Fuji
> -	  compliant ATAPI or SCSI drive, which is just about any newer
> -	  DVD/CD writer.
> -
> -	  Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
> -	  is possible.
> -	  DVD-RW disks must be in restricted overwrite mode.
> -
> -	  See the file <file:Documentation/cdrom/packet-writing.rst>
> -	  for further information on the use of this driver.
> -
> -	  To compile this driver as a module, choose M here: the
> -	  module will be called pktcdvd.
> -
> -config CDROM_PKTCDVD_BUFFERS
> -	int "Free buffers for data gathering"
> -	depends on CDROM_PKTCDVD
> -	default "8"
> -	help
> -	  This controls the maximum number of active concurrent packets. More
> -	  concurrent packets can increase write performance, but also require
> -	  more memory. Each concurrent packet will require approximately 64Kb
> -	  of non-swappable kernel memory, memory which will be allocated when
> -	  a disc is opened for writing.
> -
> -config CDROM_PKTCDVD_WCACHE
> -	bool "Enable write caching"
> -	depends on CDROM_PKTCDVD
> -	help
> -	  If enabled, write caching will be set for the CD-R/W device. For now
> -	  this option is dangerous unless the CD-RW media is known good, as we
> -	  don't do deferred write error handling yet.
> -
>  config ATA_OVER_ETH
>  	tristate "ATA over Ethernet support"
>  	depends on NET
> diff --git a/drivers/block/Makefile b/drivers/block/Makefile
> index 101612cba303..962ee65d8ca3 100644
> --- a/drivers/block/Makefile
> +++ b/drivers/block/Makefile
> @@ -20,7 +20,6 @@ obj-$(CONFIG_AMIGA_Z2RAM)	+= z2ram.o
>  obj-$(CONFIG_N64CART)		+= n64cart.o
>  obj-$(CONFIG_BLK_DEV_RAM)	+= brd.o
>  obj-$(CONFIG_BLK_DEV_LOOP)	+= loop.o
> -obj-$(CONFIG_CDROM_PKTCDVD)	+= pktcdvd.o
>  obj-$(CONFIG_SUNVDC)		+= sunvdc.o
>  
>  obj-$(CONFIG_BLK_DEV_NBD)	+= nbd.o
> diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
> deleted file mode 100644
> index 4cea3b08087e..000000000000
> --- a/drivers/block/pktcdvd.c
> +++ /dev/null
> @@ -1,2944 +0,0 @@
> -/*
> - * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
> - * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
> - * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
> - *
> - * May be copied or modified under the terms of the GNU General Public
> - * License.  See linux/COPYING for more information.
> - *
> - * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
> - * DVD-RAM devices.
> - *
> - * Theory of operation:
> - *
> - * At the lowest level, there is the standard driver for the CD/DVD device,
> - * such as drivers/scsi/sr.c. This driver can handle read and write requests,
> - * but it doesn't know anything about the special restrictions that apply to
> - * packet writing. One restriction is that write requests must be aligned to
> - * packet boundaries on the physical media, and the size of a write request
> - * must be equal to the packet size. Another restriction is that a
> - * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
> - * command, if the previous command was a write.
> - *
> - * The purpose of the packet writing driver is to hide these restrictions from
> - * higher layers, such as file systems, and present a block device that can be
> - * randomly read and written using 2kB-sized blocks.
> - *
> - * The lowest layer in the packet writing driver is the packet I/O scheduler.
> - * Its data is defined by the struct packet_iosched and includes two bio
> - * queues with pending read and write requests. These queues are processed
> - * by the pkt_iosched_process_queue() function. The write requests in this
> - * queue are already properly aligned and sized. This layer is responsible for
> - * issuing the flush cache commands and scheduling the I/O in a good order.
> - *
> - * The next layer transforms unaligned write requests to aligned writes. This
> - * transformation requires reading missing pieces of data from the underlying
> - * block device, assembling the pieces to full packets and queuing them to the
> - * packet I/O scheduler.
> - *
> - * At the top layer there is a custom ->submit_bio function that forwards
> - * read requests directly to the iosched queue and puts write requests in the
> - * unaligned write queue. A kernel thread performs the necessary read
> - * gathering to convert the unaligned writes to aligned writes and then feeds
> - * them to the packet I/O scheduler.
> - *
> - *************************************************************************/
> -
> -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> -
> -#include <linux/pktcdvd.h>
> -#include <linux/module.h>
> -#include <linux/types.h>
> -#include <linux/kernel.h>
> -#include <linux/compat.h>
> -#include <linux/kthread.h>
> -#include <linux/errno.h>
> -#include <linux/spinlock.h>
> -#include <linux/file.h>
> -#include <linux/proc_fs.h>
> -#include <linux/seq_file.h>
> -#include <linux/miscdevice.h>
> -#include <linux/freezer.h>
> -#include <linux/mutex.h>
> -#include <linux/slab.h>
> -#include <linux/backing-dev.h>
> -#include <scsi/scsi_cmnd.h>
> -#include <scsi/scsi_ioctl.h>
> -#include <scsi/scsi.h>
> -#include <linux/debugfs.h>
> -#include <linux/device.h>
> -#include <linux/nospec.h>
> -#include <linux/uaccess.h>
> -
> -#define DRIVER_NAME	"pktcdvd"
> -
> -#define pkt_err(pd, fmt, ...)						\
> -	pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
> -#define pkt_notice(pd, fmt, ...)					\
> -	pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
> -#define pkt_info(pd, fmt, ...)						\
> -	pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
> -
> -#define pkt_dbg(level, pd, fmt, ...)					\
> -do {									\
> -	if (level == 2 && PACKET_DEBUG >= 2)				\
> -		pr_notice("%s: %s():" fmt,				\
> -			  pd->name, __func__, ##__VA_ARGS__);		\
> -	else if (level == 1 && PACKET_DEBUG >= 1)			\
> -		pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__);		\
> -} while (0)
> -
> -#define MAX_SPEED 0xffff
> -
> -static DEFINE_MUTEX(pktcdvd_mutex);
> -static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
> -static struct proc_dir_entry *pkt_proc;
> -static int pktdev_major;
> -static int write_congestion_on  = PKT_WRITE_CONGESTION_ON;
> -static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
> -static struct mutex ctl_mutex;	/* Serialize open/close/setup/teardown */
> -static mempool_t psd_pool;
> -static struct bio_set pkt_bio_set;
> -
> -static struct class	*class_pktcdvd = NULL;    /* /sys/class/pktcdvd */
> -static struct dentry	*pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
> -
> -/* forward declaration */
> -static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
> -static int pkt_remove_dev(dev_t pkt_dev);
> -static int pkt_seq_show(struct seq_file *m, void *p);
> -
> -static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
> -{
> -	return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
> -}
> -
> -/**********************************************************
> - * sysfs interface for pktcdvd
> - * by (C) 2006  Thomas Maier <balagi@justmail.de>
> - 
> -  /sys/class/pktcdvd/pktcdvd[0-7]/
> -                     stat/reset
> -                     stat/packets_started
> -                     stat/packets_finished
> -                     stat/kb_written
> -                     stat/kb_read
> -                     stat/kb_read_gather
> -                     write_queue/size
> -                     write_queue/congestion_off
> -                     write_queue/congestion_on
> - **********************************************************/
> -
> -static ssize_t packets_started_show(struct device *dev,
> -				    struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started);
> -}
> -static DEVICE_ATTR_RO(packets_started);
> -
> -static ssize_t packets_finished_show(struct device *dev,
> -				     struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended);
> -}
> -static DEVICE_ATTR_RO(packets_finished);
> -
> -static ssize_t kb_written_show(struct device *dev,
> -			       struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1);
> -}
> -static DEVICE_ATTR_RO(kb_written);
> -
> -static ssize_t kb_read_show(struct device *dev,
> -			    struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1);
> -}
> -static DEVICE_ATTR_RO(kb_read);
> -
> -static ssize_t kb_read_gather_show(struct device *dev,
> -				   struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1);
> -}
> -static DEVICE_ATTR_RO(kb_read_gather);
> -
> -static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
> -			   const char *buf, size_t len)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -
> -	if (len > 0) {
> -		pd->stats.pkt_started = 0;
> -		pd->stats.pkt_ended = 0;
> -		pd->stats.secs_w = 0;
> -		pd->stats.secs_rg = 0;
> -		pd->stats.secs_r = 0;
> -	}
> -	return len;
> -}
> -static DEVICE_ATTR_WO(reset);
> -
> -static struct attribute *pkt_stat_attrs[] = {
> -	&dev_attr_packets_finished.attr,
> -	&dev_attr_packets_started.attr,
> -	&dev_attr_kb_read.attr,
> -	&dev_attr_kb_written.attr,
> -	&dev_attr_kb_read_gather.attr,
> -	&dev_attr_reset.attr,
> -	NULL,
> -};
> -
> -static const struct attribute_group pkt_stat_group = {
> -	.name = "stat",
> -	.attrs = pkt_stat_attrs,
> -};
> -
> -static ssize_t size_show(struct device *dev,
> -			 struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -	int n;
> -
> -	spin_lock(&pd->lock);
> -	n = sysfs_emit(buf, "%d\n", pd->bio_queue_size);
> -	spin_unlock(&pd->lock);
> -	return n;
> -}
> -static DEVICE_ATTR_RO(size);
> -
> -static void init_write_congestion_marks(int* lo, int* hi)
> -{
> -	if (*hi > 0) {
> -		*hi = max(*hi, 500);
> -		*hi = min(*hi, 1000000);
> -		if (*lo <= 0)
> -			*lo = *hi - 100;
> -		else {
> -			*lo = min(*lo, *hi - 100);
> -			*lo = max(*lo, 100);
> -		}
> -	} else {
> -		*hi = -1;
> -		*lo = -1;
> -	}
> -}
> -
> -static ssize_t congestion_off_show(struct device *dev,
> -				   struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -	int n;
> -
> -	spin_lock(&pd->lock);
> -	n = sysfs_emit(buf, "%d\n", pd->write_congestion_off);
> -	spin_unlock(&pd->lock);
> -	return n;
> -}
> -
> -static ssize_t congestion_off_store(struct device *dev,
> -				    struct device_attribute *attr,
> -				    const char *buf, size_t len)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -	int val;
> -
> -	if (sscanf(buf, "%d", &val) == 1) {
> -		spin_lock(&pd->lock);
> -		pd->write_congestion_off = val;
> -		init_write_congestion_marks(&pd->write_congestion_off,
> -					&pd->write_congestion_on);
> -		spin_unlock(&pd->lock);
> -	}
> -	return len;
> -}
> -static DEVICE_ATTR_RW(congestion_off);
> -
> -static ssize_t congestion_on_show(struct device *dev,
> -				  struct device_attribute *attr, char *buf)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -	int n;
> -
> -	spin_lock(&pd->lock);
> -	n = sysfs_emit(buf, "%d\n", pd->write_congestion_on);
> -	spin_unlock(&pd->lock);
> -	return n;
> -}
> -
> -static ssize_t congestion_on_store(struct device *dev,
> -				   struct device_attribute *attr,
> -				   const char *buf, size_t len)
> -{
> -	struct pktcdvd_device *pd = dev_get_drvdata(dev);
> -	int val;
> -
> -	if (sscanf(buf, "%d", &val) == 1) {
> -		spin_lock(&pd->lock);
> -		pd->write_congestion_on = val;
> -		init_write_congestion_marks(&pd->write_congestion_off,
> -					&pd->write_congestion_on);
> -		spin_unlock(&pd->lock);
> -	}
> -	return len;
> -}
> -static DEVICE_ATTR_RW(congestion_on);
> -
> -static struct attribute *pkt_wq_attrs[] = {
> -	&dev_attr_congestion_on.attr,
> -	&dev_attr_congestion_off.attr,
> -	&dev_attr_size.attr,
> -	NULL,
> -};
> -
> -static const struct attribute_group pkt_wq_group = {
> -	.name = "write_queue",
> -	.attrs = pkt_wq_attrs,
> -};
> -
> -static const struct attribute_group *pkt_groups[] = {
> -	&pkt_stat_group,
> -	&pkt_wq_group,
> -	NULL,
> -};
> -
> -static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
> -{
> -	if (class_pktcdvd) {
> -		pd->dev = device_create_with_groups(class_pktcdvd, NULL,
> -						    MKDEV(0, 0), pd, pkt_groups,
> -						    "%s", pd->name);
> -		if (IS_ERR(pd->dev))
> -			pd->dev = NULL;
> -	}
> -}
> -
> -static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
> -{
> -	if (class_pktcdvd)
> -		device_unregister(pd->dev);
> -}
> -
> -
> -/********************************************************************
> -  /sys/class/pktcdvd/
> -                     add            map block device
> -                     remove         unmap packet dev
> -                     device_map     show mappings
> - *******************************************************************/
> -
> -static void class_pktcdvd_release(struct class *cls)
> -{
> -	kfree(cls);
> -}
> -
> -static ssize_t device_map_show(struct class *c, struct class_attribute *attr,
> -			       char *data)
> -{
> -	int n = 0;
> -	int idx;
> -	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -	for (idx = 0; idx < MAX_WRITERS; idx++) {
> -		struct pktcdvd_device *pd = pkt_devs[idx];
> -		if (!pd)
> -			continue;
> -		n += sprintf(data+n, "%s %u:%u %u:%u\n",
> -			pd->name,
> -			MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
> -			MAJOR(pd->bdev->bd_dev),
> -			MINOR(pd->bdev->bd_dev));
> -	}
> -	mutex_unlock(&ctl_mutex);
> -	return n;
> -}
> -static CLASS_ATTR_RO(device_map);
> -
> -static ssize_t add_store(struct class *c, struct class_attribute *attr,
> -			 const char *buf, size_t count)
> -{
> -	unsigned int major, minor;
> -
> -	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
> -		/* pkt_setup_dev() expects caller to hold reference to self */
> -		if (!try_module_get(THIS_MODULE))
> -			return -ENODEV;
> -
> -		pkt_setup_dev(MKDEV(major, minor), NULL);
> -
> -		module_put(THIS_MODULE);
> -
> -		return count;
> -	}
> -
> -	return -EINVAL;
> -}
> -static CLASS_ATTR_WO(add);
> -
> -static ssize_t remove_store(struct class *c, struct class_attribute *attr,
> -			    const char *buf, size_t count)
> -{
> -	unsigned int major, minor;
> -	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
> -		pkt_remove_dev(MKDEV(major, minor));
> -		return count;
> -	}
> -	return -EINVAL;
> -}
> -static CLASS_ATTR_WO(remove);
> -
> -static struct attribute *class_pktcdvd_attrs[] = {
> -	&class_attr_add.attr,
> -	&class_attr_remove.attr,
> -	&class_attr_device_map.attr,
> -	NULL,
> -};
> -ATTRIBUTE_GROUPS(class_pktcdvd);
> -
> -static int pkt_sysfs_init(void)
> -{
> -	int ret = 0;
> -
> -	/*
> -	 * create control files in sysfs
> -	 * /sys/class/pktcdvd/...
> -	 */
> -	class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
> -	if (!class_pktcdvd)
> -		return -ENOMEM;
> -	class_pktcdvd->name = DRIVER_NAME;
> -	class_pktcdvd->owner = THIS_MODULE;
> -	class_pktcdvd->class_release = class_pktcdvd_release;
> -	class_pktcdvd->class_groups = class_pktcdvd_groups;
> -	ret = class_register(class_pktcdvd);
> -	if (ret) {
> -		kfree(class_pktcdvd);
> -		class_pktcdvd = NULL;
> -		pr_err("failed to create class pktcdvd\n");
> -		return ret;
> -	}
> -	return 0;
> -}
> -
> -static void pkt_sysfs_cleanup(void)
> -{
> -	if (class_pktcdvd)
> -		class_destroy(class_pktcdvd);
> -	class_pktcdvd = NULL;
> -}
> -
> -/********************************************************************
> -  entries in debugfs
> -
> -  /sys/kernel/debug/pktcdvd[0-7]/
> -			info
> -
> - *******************************************************************/
> -
> -static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
> -{
> -	return pkt_seq_show(m, p);
> -}
> -
> -static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
> -{
> -	return single_open(file, pkt_debugfs_seq_show, inode->i_private);
> -}
> -
> -static const struct file_operations debug_fops = {
> -	.open		= pkt_debugfs_fops_open,
> -	.read		= seq_read,
> -	.llseek		= seq_lseek,
> -	.release	= single_release,
> -	.owner		= THIS_MODULE,
> -};
> -
> -static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
> -{
> -	if (!pkt_debugfs_root)
> -		return;
> -	pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
> -	if (!pd->dfs_d_root)
> -		return;
> -
> -	pd->dfs_f_info = debugfs_create_file("info", 0444,
> -					     pd->dfs_d_root, pd, &debug_fops);
> -}
> -
> -static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
> -{
> -	if (!pkt_debugfs_root)
> -		return;
> -	debugfs_remove(pd->dfs_f_info);
> -	debugfs_remove(pd->dfs_d_root);
> -	pd->dfs_f_info = NULL;
> -	pd->dfs_d_root = NULL;
> -}
> -
> -static void pkt_debugfs_init(void)
> -{
> -	pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
> -}
> -
> -static void pkt_debugfs_cleanup(void)
> -{
> -	debugfs_remove(pkt_debugfs_root);
> -	pkt_debugfs_root = NULL;
> -}
> -
> -/* ----------------------------------------------------------*/
> -
> -
> -static void pkt_bio_finished(struct pktcdvd_device *pd)
> -{
> -	BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
> -	if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
> -		pkt_dbg(2, pd, "queue empty\n");
> -		atomic_set(&pd->iosched.attention, 1);
> -		wake_up(&pd->wqueue);
> -	}
> -}
> -
> -/*
> - * Allocate a packet_data struct
> - */
> -static struct packet_data *pkt_alloc_packet_data(int frames)
> -{
> -	int i;
> -	struct packet_data *pkt;
> -
> -	pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
> -	if (!pkt)
> -		goto no_pkt;
> -
> -	pkt->frames = frames;
> -	pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL);
> -	if (!pkt->w_bio)
> -		goto no_bio;
> -
> -	for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
> -		pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
> -		if (!pkt->pages[i])
> -			goto no_page;
> -	}
> -
> -	spin_lock_init(&pkt->lock);
> -	bio_list_init(&pkt->orig_bios);
> -
> -	for (i = 0; i < frames; i++) {
> -		pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL);
> -		if (!pkt->r_bios[i])
> -			goto no_rd_bio;
> -	}
> -
> -	return pkt;
> -
> -no_rd_bio:
> -	for (i = 0; i < frames; i++)
> -		kfree(pkt->r_bios[i]);
> -no_page:
> -	for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
> -		if (pkt->pages[i])
> -			__free_page(pkt->pages[i]);
> -	kfree(pkt->w_bio);
> -no_bio:
> -	kfree(pkt);
> -no_pkt:
> -	return NULL;
> -}
> -
> -/*
> - * Free a packet_data struct
> - */
> -static void pkt_free_packet_data(struct packet_data *pkt)
> -{
> -	int i;
> -
> -	for (i = 0; i < pkt->frames; i++)
> -		kfree(pkt->r_bios[i]);
> -	for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
> -		__free_page(pkt->pages[i]);
> -	kfree(pkt->w_bio);
> -	kfree(pkt);
> -}
> -
> -static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
> -{
> -	struct packet_data *pkt, *next;
> -
> -	BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
> -
> -	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
> -		pkt_free_packet_data(pkt);
> -	}
> -	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
> -}
> -
> -static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
> -{
> -	struct packet_data *pkt;
> -
> -	BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
> -
> -	while (nr_packets > 0) {
> -		pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
> -		if (!pkt) {
> -			pkt_shrink_pktlist(pd);
> -			return 0;
> -		}
> -		pkt->id = nr_packets;
> -		pkt->pd = pd;
> -		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
> -		nr_packets--;
> -	}
> -	return 1;
> -}
> -
> -static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
> -{
> -	struct rb_node *n = rb_next(&node->rb_node);
> -	if (!n)
> -		return NULL;
> -	return rb_entry(n, struct pkt_rb_node, rb_node);
> -}
> -
> -static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
> -{
> -	rb_erase(&node->rb_node, &pd->bio_queue);
> -	mempool_free(node, &pd->rb_pool);
> -	pd->bio_queue_size--;
> -	BUG_ON(pd->bio_queue_size < 0);
> -}
> -
> -/*
> - * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
> - */
> -static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
> -{
> -	struct rb_node *n = pd->bio_queue.rb_node;
> -	struct rb_node *next;
> -	struct pkt_rb_node *tmp;
> -
> -	if (!n) {
> -		BUG_ON(pd->bio_queue_size > 0);
> -		return NULL;
> -	}
> -
> -	for (;;) {
> -		tmp = rb_entry(n, struct pkt_rb_node, rb_node);
> -		if (s <= tmp->bio->bi_iter.bi_sector)
> -			next = n->rb_left;
> -		else
> -			next = n->rb_right;
> -		if (!next)
> -			break;
> -		n = next;
> -	}
> -
> -	if (s > tmp->bio->bi_iter.bi_sector) {
> -		tmp = pkt_rbtree_next(tmp);
> -		if (!tmp)
> -			return NULL;
> -	}
> -	BUG_ON(s > tmp->bio->bi_iter.bi_sector);
> -	return tmp;
> -}
> -
> -/*
> - * Insert a node into the pd->bio_queue rb tree.
> - */
> -static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
> -{
> -	struct rb_node **p = &pd->bio_queue.rb_node;
> -	struct rb_node *parent = NULL;
> -	sector_t s = node->bio->bi_iter.bi_sector;
> -	struct pkt_rb_node *tmp;
> -
> -	while (*p) {
> -		parent = *p;
> -		tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
> -		if (s < tmp->bio->bi_iter.bi_sector)
> -			p = &(*p)->rb_left;
> -		else
> -			p = &(*p)->rb_right;
> -	}
> -	rb_link_node(&node->rb_node, parent, p);
> -	rb_insert_color(&node->rb_node, &pd->bio_queue);
> -	pd->bio_queue_size++;
> -}
> -
> -/*
> - * Send a packet_command to the underlying block device and
> - * wait for completion.
> - */
> -static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
> -{
> -	struct request_queue *q = bdev_get_queue(pd->bdev);
> -	struct scsi_cmnd *scmd;
> -	struct request *rq;
> -	int ret = 0;
> -
> -	rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
> -			     REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
> -	if (IS_ERR(rq))
> -		return PTR_ERR(rq);
> -	scmd = blk_mq_rq_to_pdu(rq);
> -
> -	if (cgc->buflen) {
> -		ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
> -				      GFP_NOIO);
> -		if (ret)
> -			goto out;
> -	}
> -
> -	scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
> -	memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE);
> -
> -	rq->timeout = 60*HZ;
> -	if (cgc->quiet)
> -		rq->rq_flags |= RQF_QUIET;
> -
> -	blk_execute_rq(rq, false);
> -	if (scmd->result)
> -		ret = -EIO;
> -out:
> -	blk_mq_free_request(rq);
> -	return ret;
> -}
> -
> -static const char *sense_key_string(__u8 index)
> -{
> -	static const char * const info[] = {
> -		"No sense", "Recovered error", "Not ready",
> -		"Medium error", "Hardware error", "Illegal request",
> -		"Unit attention", "Data protect", "Blank check",
> -	};
> -
> -	return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
> -}
> -
> -/*
> - * A generic sense dump / resolve mechanism should be implemented across
> - * all ATAPI + SCSI devices.
> - */
> -static void pkt_dump_sense(struct pktcdvd_device *pd,
> -			   struct packet_command *cgc)
> -{
> -	struct scsi_sense_hdr *sshdr = cgc->sshdr;
> -
> -	if (sshdr)
> -		pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
> -			CDROM_PACKET_SIZE, cgc->cmd,
> -			sshdr->sense_key, sshdr->asc, sshdr->ascq,
> -			sense_key_string(sshdr->sense_key));
> -	else
> -		pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
> -}
> -
> -/*
> - * flush the drive cache to media
> - */
> -static int pkt_flush_cache(struct pktcdvd_device *pd)
> -{
> -	struct packet_command cgc;
> -
> -	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
> -	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
> -	cgc.quiet = 1;
> -
> -	/*
> -	 * the IMMED bit -- we default to not setting it, although that
> -	 * would allow a much faster close, this is safer
> -	 */
> -#if 0
> -	cgc.cmd[1] = 1 << 1;
> -#endif
> -	return pkt_generic_packet(pd, &cgc);
> -}
> -
> -/*
> - * speed is given as the normal factor, e.g. 4 for 4x
> - */
> -static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
> -				unsigned write_speed, unsigned read_speed)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	int ret;
> -
> -	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
> -	cgc.sshdr = &sshdr;
> -	cgc.cmd[0] = GPCMD_SET_SPEED;
> -	cgc.cmd[2] = (read_speed >> 8) & 0xff;
> -	cgc.cmd[3] = read_speed & 0xff;
> -	cgc.cmd[4] = (write_speed >> 8) & 0xff;
> -	cgc.cmd[5] = write_speed & 0xff;
> -
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret)
> -		pkt_dump_sense(pd, &cgc);
> -
> -	return ret;
> -}
> -
> -/*
> - * Queue a bio for processing by the low-level CD device. Must be called
> - * from process context.
> - */
> -static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
> -{
> -	spin_lock(&pd->iosched.lock);
> -	if (bio_data_dir(bio) == READ)
> -		bio_list_add(&pd->iosched.read_queue, bio);
> -	else
> -		bio_list_add(&pd->iosched.write_queue, bio);
> -	spin_unlock(&pd->iosched.lock);
> -
> -	atomic_set(&pd->iosched.attention, 1);
> -	wake_up(&pd->wqueue);
> -}
> -
> -/*
> - * Process the queued read/write requests. This function handles special
> - * requirements for CDRW drives:
> - * - A cache flush command must be inserted before a read request if the
> - *   previous request was a write.
> - * - Switching between reading and writing is slow, so don't do it more often
> - *   than necessary.
> - * - Optimize for throughput at the expense of latency. This means that streaming
> - *   writes will never be interrupted by a read, but if the drive has to seek
> - *   before the next write, switch to reading instead if there are any pending
> - *   read requests.
> - * - Set the read speed according to current usage pattern. When only reading
> - *   from the device, it's best to use the highest possible read speed, but
> - *   when switching often between reading and writing, it's better to have the
> - *   same read and write speeds.
> - */
> -static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
> -{
> -
> -	if (atomic_read(&pd->iosched.attention) == 0)
> -		return;
> -	atomic_set(&pd->iosched.attention, 0);
> -
> -	for (;;) {
> -		struct bio *bio;
> -		int reads_queued, writes_queued;
> -
> -		spin_lock(&pd->iosched.lock);
> -		reads_queued = !bio_list_empty(&pd->iosched.read_queue);
> -		writes_queued = !bio_list_empty(&pd->iosched.write_queue);
> -		spin_unlock(&pd->iosched.lock);
> -
> -		if (!reads_queued && !writes_queued)
> -			break;
> -
> -		if (pd->iosched.writing) {
> -			int need_write_seek = 1;
> -			spin_lock(&pd->iosched.lock);
> -			bio = bio_list_peek(&pd->iosched.write_queue);
> -			spin_unlock(&pd->iosched.lock);
> -			if (bio && (bio->bi_iter.bi_sector ==
> -				    pd->iosched.last_write))
> -				need_write_seek = 0;
> -			if (need_write_seek && reads_queued) {
> -				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
> -					pkt_dbg(2, pd, "write, waiting\n");
> -					break;
> -				}
> -				pkt_flush_cache(pd);
> -				pd->iosched.writing = 0;
> -			}
> -		} else {
> -			if (!reads_queued && writes_queued) {
> -				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
> -					pkt_dbg(2, pd, "read, waiting\n");
> -					break;
> -				}
> -				pd->iosched.writing = 1;
> -			}
> -		}
> -
> -		spin_lock(&pd->iosched.lock);
> -		if (pd->iosched.writing)
> -			bio = bio_list_pop(&pd->iosched.write_queue);
> -		else
> -			bio = bio_list_pop(&pd->iosched.read_queue);
> -		spin_unlock(&pd->iosched.lock);
> -
> -		if (!bio)
> -			continue;
> -
> -		if (bio_data_dir(bio) == READ)
> -			pd->iosched.successive_reads +=
> -				bio->bi_iter.bi_size >> 10;
> -		else {
> -			pd->iosched.successive_reads = 0;
> -			pd->iosched.last_write = bio_end_sector(bio);
> -		}
> -		if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
> -			if (pd->read_speed == pd->write_speed) {
> -				pd->read_speed = MAX_SPEED;
> -				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
> -			}
> -		} else {
> -			if (pd->read_speed != pd->write_speed) {
> -				pd->read_speed = pd->write_speed;
> -				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
> -			}
> -		}
> -
> -		atomic_inc(&pd->cdrw.pending_bios);
> -		submit_bio_noacct(bio);
> -	}
> -}
> -
> -/*
> - * Special care is needed if the underlying block device has a small
> - * max_phys_segments value.
> - */
> -static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
> -{
> -	if ((pd->settings.size << 9) / CD_FRAMESIZE
> -	    <= queue_max_segments(q)) {
> -		/*
> -		 * The cdrom device can handle one segment/frame
> -		 */
> -		clear_bit(PACKET_MERGE_SEGS, &pd->flags);
> -		return 0;
> -	} else if ((pd->settings.size << 9) / PAGE_SIZE
> -		   <= queue_max_segments(q)) {
> -		/*
> -		 * We can handle this case at the expense of some extra memory
> -		 * copies during write operations
> -		 */
> -		set_bit(PACKET_MERGE_SEGS, &pd->flags);
> -		return 0;
> -	} else {
> -		pkt_err(pd, "cdrom max_phys_segments too small\n");
> -		return -EIO;
> -	}
> -}
> -
> -static void pkt_end_io_read(struct bio *bio)
> -{
> -	struct packet_data *pkt = bio->bi_private;
> -	struct pktcdvd_device *pd = pkt->pd;
> -	BUG_ON(!pd);
> -
> -	pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
> -		bio, (unsigned long long)pkt->sector,
> -		(unsigned long long)bio->bi_iter.bi_sector, bio->bi_status);
> -
> -	if (bio->bi_status)
> -		atomic_inc(&pkt->io_errors);
> -	bio_uninit(bio);
> -	if (atomic_dec_and_test(&pkt->io_wait)) {
> -		atomic_inc(&pkt->run_sm);
> -		wake_up(&pd->wqueue);
> -	}
> -	pkt_bio_finished(pd);
> -}
> -
> -static void pkt_end_io_packet_write(struct bio *bio)
> -{
> -	struct packet_data *pkt = bio->bi_private;
> -	struct pktcdvd_device *pd = pkt->pd;
> -	BUG_ON(!pd);
> -
> -	pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status);
> -
> -	pd->stats.pkt_ended++;
> -
> -	bio_uninit(bio);
> -	pkt_bio_finished(pd);
> -	atomic_dec(&pkt->io_wait);
> -	atomic_inc(&pkt->run_sm);
> -	wake_up(&pd->wqueue);
> -}
> -
> -/*
> - * Schedule reads for the holes in a packet
> - */
> -static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
> -{
> -	int frames_read = 0;
> -	struct bio *bio;
> -	int f;
> -	char written[PACKET_MAX_SIZE];
> -
> -	BUG_ON(bio_list_empty(&pkt->orig_bios));
> -
> -	atomic_set(&pkt->io_wait, 0);
> -	atomic_set(&pkt->io_errors, 0);
> -
> -	/*
> -	 * Figure out which frames we need to read before we can write.
> -	 */
> -	memset(written, 0, sizeof(written));
> -	spin_lock(&pkt->lock);
> -	bio_list_for_each(bio, &pkt->orig_bios) {
> -		int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
> -			(CD_FRAMESIZE >> 9);
> -		int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
> -		pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
> -		BUG_ON(first_frame < 0);
> -		BUG_ON(first_frame + num_frames > pkt->frames);
> -		for (f = first_frame; f < first_frame + num_frames; f++)
> -			written[f] = 1;
> -	}
> -	spin_unlock(&pkt->lock);
> -
> -	if (pkt->cache_valid) {
> -		pkt_dbg(2, pd, "zone %llx cached\n",
> -			(unsigned long long)pkt->sector);
> -		goto out_account;
> -	}
> -
> -	/*
> -	 * Schedule reads for missing parts of the packet.
> -	 */
> -	for (f = 0; f < pkt->frames; f++) {
> -		int p, offset;
> -
> -		if (written[f])
> -			continue;
> -
> -		bio = pkt->r_bios[f];
> -		bio_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ);
> -		bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
> -		bio->bi_end_io = pkt_end_io_read;
> -		bio->bi_private = pkt;
> -
> -		p = (f * CD_FRAMESIZE) / PAGE_SIZE;
> -		offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
> -		pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
> -			f, pkt->pages[p], offset);
> -		if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
> -			BUG();
> -
> -		atomic_inc(&pkt->io_wait);
> -		pkt_queue_bio(pd, bio);
> -		frames_read++;
> -	}
> -
> -out_account:
> -	pkt_dbg(2, pd, "need %d frames for zone %llx\n",
> -		frames_read, (unsigned long long)pkt->sector);
> -	pd->stats.pkt_started++;
> -	pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
> -}
> -
> -/*
> - * Find a packet matching zone, or the least recently used packet if
> - * there is no match.
> - */
> -static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
> -{
> -	struct packet_data *pkt;
> -
> -	list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
> -		if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
> -			list_del_init(&pkt->list);
> -			if (pkt->sector != zone)
> -				pkt->cache_valid = 0;
> -			return pkt;
> -		}
> -	}
> -	BUG();
> -	return NULL;
> -}
> -
> -static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
> -{
> -	if (pkt->cache_valid) {
> -		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
> -	} else {
> -		list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
> -	}
> -}
> -
> -static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
> -{
> -#if PACKET_DEBUG > 1
> -	static const char *state_name[] = {
> -		"IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
> -	};
> -	enum packet_data_state old_state = pkt->state;
> -	pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
> -		pkt->id, (unsigned long long)pkt->sector,
> -		state_name[old_state], state_name[state]);
> -#endif
> -	pkt->state = state;
> -}
> -
> -/*
> - * Scan the work queue to see if we can start a new packet.
> - * returns non-zero if any work was done.
> - */
> -static int pkt_handle_queue(struct pktcdvd_device *pd)
> -{
> -	struct packet_data *pkt, *p;
> -	struct bio *bio = NULL;
> -	sector_t zone = 0; /* Suppress gcc warning */
> -	struct pkt_rb_node *node, *first_node;
> -	struct rb_node *n;
> -
> -	atomic_set(&pd->scan_queue, 0);
> -
> -	if (list_empty(&pd->cdrw.pkt_free_list)) {
> -		pkt_dbg(2, pd, "no pkt\n");
> -		return 0;
> -	}
> -
> -	/*
> -	 * Try to find a zone we are not already working on.
> -	 */
> -	spin_lock(&pd->lock);
> -	first_node = pkt_rbtree_find(pd, pd->current_sector);
> -	if (!first_node) {
> -		n = rb_first(&pd->bio_queue);
> -		if (n)
> -			first_node = rb_entry(n, struct pkt_rb_node, rb_node);
> -	}
> -	node = first_node;
> -	while (node) {
> -		bio = node->bio;
> -		zone = get_zone(bio->bi_iter.bi_sector, pd);
> -		list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
> -			if (p->sector == zone) {
> -				bio = NULL;
> -				goto try_next_bio;
> -			}
> -		}
> -		break;
> -try_next_bio:
> -		node = pkt_rbtree_next(node);
> -		if (!node) {
> -			n = rb_first(&pd->bio_queue);
> -			if (n)
> -				node = rb_entry(n, struct pkt_rb_node, rb_node);
> -		}
> -		if (node == first_node)
> -			node = NULL;
> -	}
> -	spin_unlock(&pd->lock);
> -	if (!bio) {
> -		pkt_dbg(2, pd, "no bio\n");
> -		return 0;
> -	}
> -
> -	pkt = pkt_get_packet_data(pd, zone);
> -
> -	pd->current_sector = zone + pd->settings.size;
> -	pkt->sector = zone;
> -	BUG_ON(pkt->frames != pd->settings.size >> 2);
> -	pkt->write_size = 0;
> -
> -	/*
> -	 * Scan work queue for bios in the same zone and link them
> -	 * to this packet.
> -	 */
> -	spin_lock(&pd->lock);
> -	pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
> -	while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
> -		bio = node->bio;
> -		pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
> -			get_zone(bio->bi_iter.bi_sector, pd));
> -		if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
> -			break;
> -		pkt_rbtree_erase(pd, node);
> -		spin_lock(&pkt->lock);
> -		bio_list_add(&pkt->orig_bios, bio);
> -		pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
> -		spin_unlock(&pkt->lock);
> -	}
> -	/* check write congestion marks, and if bio_queue_size is
> -	 * below, wake up any waiters
> -	 */
> -	if (pd->congested &&
> -	    pd->bio_queue_size <= pd->write_congestion_off) {
> -		pd->congested = false;
> -		wake_up_var(&pd->congested);
> -	}
> -	spin_unlock(&pd->lock);
> -
> -	pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
> -	pkt_set_state(pkt, PACKET_WAITING_STATE);
> -	atomic_set(&pkt->run_sm, 1);
> -
> -	spin_lock(&pd->cdrw.active_list_lock);
> -	list_add(&pkt->list, &pd->cdrw.pkt_active_list);
> -	spin_unlock(&pd->cdrw.active_list_lock);
> -
> -	return 1;
> -}
> -
> -/**
> - * bio_list_copy_data - copy contents of data buffers from one chain of bios to
> - * another
> - * @src: source bio list
> - * @dst: destination bio list
> - *
> - * Stops when it reaches the end of either the @src list or @dst list - that is,
> - * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of
> - * bios).
> - */
> -static void bio_list_copy_data(struct bio *dst, struct bio *src)
> -{
> -	struct bvec_iter src_iter = src->bi_iter;
> -	struct bvec_iter dst_iter = dst->bi_iter;
> -
> -	while (1) {
> -		if (!src_iter.bi_size) {
> -			src = src->bi_next;
> -			if (!src)
> -				break;
> -
> -			src_iter = src->bi_iter;
> -		}
> -
> -		if (!dst_iter.bi_size) {
> -			dst = dst->bi_next;
> -			if (!dst)
> -				break;
> -
> -			dst_iter = dst->bi_iter;
> -		}
> -
> -		bio_copy_data_iter(dst, &dst_iter, src, &src_iter);
> -	}
> -}
> -
> -/*
> - * Assemble a bio to write one packet and queue the bio for processing
> - * by the underlying block device.
> - */
> -static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
> -{
> -	int f;
> -
> -	bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames,
> -		 REQ_OP_WRITE);
> -	pkt->w_bio->bi_iter.bi_sector = pkt->sector;
> -	pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
> -	pkt->w_bio->bi_private = pkt;
> -
> -	/* XXX: locking? */
> -	for (f = 0; f < pkt->frames; f++) {
> -		struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
> -		unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
> -
> -		if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
> -			BUG();
> -	}
> -	pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
> -
> -	/*
> -	 * Fill-in bvec with data from orig_bios.
> -	 */
> -	spin_lock(&pkt->lock);
> -	bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
> -
> -	pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
> -	spin_unlock(&pkt->lock);
> -
> -	pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
> -		pkt->write_size, (unsigned long long)pkt->sector);
> -
> -	if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
> -		pkt->cache_valid = 1;
> -	else
> -		pkt->cache_valid = 0;
> -
> -	/* Start the write request */
> -	atomic_set(&pkt->io_wait, 1);
> -	pkt_queue_bio(pd, pkt->w_bio);
> -}
> -
> -static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
> -{
> -	struct bio *bio;
> -
> -	if (status)
> -		pkt->cache_valid = 0;
> -
> -	/* Finish all bios corresponding to this packet */
> -	while ((bio = bio_list_pop(&pkt->orig_bios))) {
> -		bio->bi_status = status;
> -		bio_endio(bio);
> -	}
> -}
> -
> -static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
> -{
> -	pkt_dbg(2, pd, "pkt %d\n", pkt->id);
> -
> -	for (;;) {
> -		switch (pkt->state) {
> -		case PACKET_WAITING_STATE:
> -			if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
> -				return;
> -
> -			pkt->sleep_time = 0;
> -			pkt_gather_data(pd, pkt);
> -			pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
> -			break;
> -
> -		case PACKET_READ_WAIT_STATE:
> -			if (atomic_read(&pkt->io_wait) > 0)
> -				return;
> -
> -			if (atomic_read(&pkt->io_errors) > 0) {
> -				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
> -			} else {
> -				pkt_start_write(pd, pkt);
> -			}
> -			break;
> -
> -		case PACKET_WRITE_WAIT_STATE:
> -			if (atomic_read(&pkt->io_wait) > 0)
> -				return;
> -
> -			if (!pkt->w_bio->bi_status) {
> -				pkt_set_state(pkt, PACKET_FINISHED_STATE);
> -			} else {
> -				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
> -			}
> -			break;
> -
> -		case PACKET_RECOVERY_STATE:
> -			pkt_dbg(2, pd, "No recovery possible\n");
> -			pkt_set_state(pkt, PACKET_FINISHED_STATE);
> -			break;
> -
> -		case PACKET_FINISHED_STATE:
> -			pkt_finish_packet(pkt, pkt->w_bio->bi_status);
> -			return;
> -
> -		default:
> -			BUG();
> -			break;
> -		}
> -	}
> -}
> -
> -static void pkt_handle_packets(struct pktcdvd_device *pd)
> -{
> -	struct packet_data *pkt, *next;
> -
> -	/*
> -	 * Run state machine for active packets
> -	 */
> -	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -		if (atomic_read(&pkt->run_sm) > 0) {
> -			atomic_set(&pkt->run_sm, 0);
> -			pkt_run_state_machine(pd, pkt);
> -		}
> -	}
> -
> -	/*
> -	 * Move no longer active packets to the free list
> -	 */
> -	spin_lock(&pd->cdrw.active_list_lock);
> -	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
> -		if (pkt->state == PACKET_FINISHED_STATE) {
> -			list_del(&pkt->list);
> -			pkt_put_packet_data(pd, pkt);
> -			pkt_set_state(pkt, PACKET_IDLE_STATE);
> -			atomic_set(&pd->scan_queue, 1);
> -		}
> -	}
> -	spin_unlock(&pd->cdrw.active_list_lock);
> -}
> -
> -static void pkt_count_states(struct pktcdvd_device *pd, int *states)
> -{
> -	struct packet_data *pkt;
> -	int i;
> -
> -	for (i = 0; i < PACKET_NUM_STATES; i++)
> -		states[i] = 0;
> -
> -	spin_lock(&pd->cdrw.active_list_lock);
> -	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -		states[pkt->state]++;
> -	}
> -	spin_unlock(&pd->cdrw.active_list_lock);
> -}
> -
> -/*
> - * kcdrwd is woken up when writes have been queued for one of our
> - * registered devices
> - */
> -static int kcdrwd(void *foobar)
> -{
> -	struct pktcdvd_device *pd = foobar;
> -	struct packet_data *pkt;
> -	long min_sleep_time, residue;
> -
> -	set_user_nice(current, MIN_NICE);
> -	set_freezable();
> -
> -	for (;;) {
> -		DECLARE_WAITQUEUE(wait, current);
> -
> -		/*
> -		 * Wait until there is something to do
> -		 */
> -		add_wait_queue(&pd->wqueue, &wait);
> -		for (;;) {
> -			set_current_state(TASK_INTERRUPTIBLE);
> -
> -			/* Check if we need to run pkt_handle_queue */
> -			if (atomic_read(&pd->scan_queue) > 0)
> -				goto work_to_do;
> -
> -			/* Check if we need to run the state machine for some packet */
> -			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -				if (atomic_read(&pkt->run_sm) > 0)
> -					goto work_to_do;
> -			}
> -
> -			/* Check if we need to process the iosched queues */
> -			if (atomic_read(&pd->iosched.attention) != 0)
> -				goto work_to_do;
> -
> -			/* Otherwise, go to sleep */
> -			if (PACKET_DEBUG > 1) {
> -				int states[PACKET_NUM_STATES];
> -				pkt_count_states(pd, states);
> -				pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
> -					states[0], states[1], states[2],
> -					states[3], states[4], states[5]);
> -			}
> -
> -			min_sleep_time = MAX_SCHEDULE_TIMEOUT;
> -			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -				if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
> -					min_sleep_time = pkt->sleep_time;
> -			}
> -
> -			pkt_dbg(2, pd, "sleeping\n");
> -			residue = schedule_timeout(min_sleep_time);
> -			pkt_dbg(2, pd, "wake up\n");
> -
> -			/* make swsusp happy with our thread */
> -			try_to_freeze();
> -
> -			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -				if (!pkt->sleep_time)
> -					continue;
> -				pkt->sleep_time -= min_sleep_time - residue;
> -				if (pkt->sleep_time <= 0) {
> -					pkt->sleep_time = 0;
> -					atomic_inc(&pkt->run_sm);
> -				}
> -			}
> -
> -			if (kthread_should_stop())
> -				break;
> -		}
> -work_to_do:
> -		set_current_state(TASK_RUNNING);
> -		remove_wait_queue(&pd->wqueue, &wait);
> -
> -		if (kthread_should_stop())
> -			break;
> -
> -		/*
> -		 * if pkt_handle_queue returns true, we can queue
> -		 * another request.
> -		 */
> -		while (pkt_handle_queue(pd))
> -			;
> -
> -		/*
> -		 * Handle packet state machine
> -		 */
> -		pkt_handle_packets(pd);
> -
> -		/*
> -		 * Handle iosched queues
> -		 */
> -		pkt_iosched_process_queue(pd);
> -	}
> -
> -	return 0;
> -}
> -
> -static void pkt_print_settings(struct pktcdvd_device *pd)
> -{
> -	pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
> -		 pd->settings.fp ? "Fixed" : "Variable",
> -		 pd->settings.size >> 2,
> -		 pd->settings.block_mode == 8 ? '1' : '2');
> -}
> -
> -static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
> -{
> -	memset(cgc->cmd, 0, sizeof(cgc->cmd));
> -
> -	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
> -	cgc->cmd[2] = page_code | (page_control << 6);
> -	cgc->cmd[7] = cgc->buflen >> 8;
> -	cgc->cmd[8] = cgc->buflen & 0xff;
> -	cgc->data_direction = CGC_DATA_READ;
> -	return pkt_generic_packet(pd, cgc);
> -}
> -
> -static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
> -{
> -	memset(cgc->cmd, 0, sizeof(cgc->cmd));
> -	memset(cgc->buffer, 0, 2);
> -	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
> -	cgc->cmd[1] = 0x10;		/* PF */
> -	cgc->cmd[7] = cgc->buflen >> 8;
> -	cgc->cmd[8] = cgc->buflen & 0xff;
> -	cgc->data_direction = CGC_DATA_WRITE;
> -	return pkt_generic_packet(pd, cgc);
> -}
> -
> -static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
> -{
> -	struct packet_command cgc;
> -	int ret;
> -
> -	/* set up command and get the disc info */
> -	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
> -	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
> -	cgc.cmd[8] = cgc.buflen = 2;
> -	cgc.quiet = 1;
> -
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret)
> -		return ret;
> -
> -	/* not all drives have the same disc_info length, so requeue
> -	 * packet with the length the drive tells us it can supply
> -	 */
> -	cgc.buflen = be16_to_cpu(di->disc_information_length) +
> -		     sizeof(di->disc_information_length);
> -
> -	if (cgc.buflen > sizeof(disc_information))
> -		cgc.buflen = sizeof(disc_information);
> -
> -	cgc.cmd[8] = cgc.buflen;
> -	return pkt_generic_packet(pd, &cgc);
> -}
> -
> -static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
> -{
> -	struct packet_command cgc;
> -	int ret;
> -
> -	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
> -	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
> -	cgc.cmd[1] = type & 3;
> -	cgc.cmd[4] = (track & 0xff00) >> 8;
> -	cgc.cmd[5] = track & 0xff;
> -	cgc.cmd[8] = 8;
> -	cgc.quiet = 1;
> -
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret)
> -		return ret;
> -
> -	cgc.buflen = be16_to_cpu(ti->track_information_length) +
> -		     sizeof(ti->track_information_length);
> -
> -	if (cgc.buflen > sizeof(track_information))
> -		cgc.buflen = sizeof(track_information);
> -
> -	cgc.cmd[8] = cgc.buflen;
> -	return pkt_generic_packet(pd, &cgc);
> -}
> -
> -static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
> -						long *last_written)
> -{
> -	disc_information di;
> -	track_information ti;
> -	__u32 last_track;
> -	int ret;
> -
> -	ret = pkt_get_disc_info(pd, &di);
> -	if (ret)
> -		return ret;
> -
> -	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
> -	ret = pkt_get_track_info(pd, last_track, 1, &ti);
> -	if (ret)
> -		return ret;
> -
> -	/* if this track is blank, try the previous. */
> -	if (ti.blank) {
> -		last_track--;
> -		ret = pkt_get_track_info(pd, last_track, 1, &ti);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	/* if last recorded field is valid, return it. */
> -	if (ti.lra_v) {
> -		*last_written = be32_to_cpu(ti.last_rec_address);
> -	} else {
> -		/* make it up instead */
> -		*last_written = be32_to_cpu(ti.track_start) +
> -				be32_to_cpu(ti.track_size);
> -		if (ti.free_blocks)
> -			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
> -	}
> -	return 0;
> -}
> -
> -/*
> - * write mode select package based on pd->settings
> - */
> -static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	write_param_page *wp;
> -	char buffer[128];
> -	int ret, size;
> -
> -	/* doesn't apply to DVD+RW or DVD-RAM */
> -	if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
> -		return 0;
> -
> -	memset(buffer, 0, sizeof(buffer));
> -	init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
> -	cgc.sshdr = &sshdr;
> -	ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
> -	if (ret) {
> -		pkt_dump_sense(pd, &cgc);
> -		return ret;
> -	}
> -
> -	size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
> -	pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
> -	if (size > sizeof(buffer))
> -		size = sizeof(buffer);
> -
> -	/*
> -	 * now get it all
> -	 */
> -	init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
> -	cgc.sshdr = &sshdr;
> -	ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
> -	if (ret) {
> -		pkt_dump_sense(pd, &cgc);
> -		return ret;
> -	}
> -
> -	/*
> -	 * write page is offset header + block descriptor length
> -	 */
> -	wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
> -
> -	wp->fp = pd->settings.fp;
> -	wp->track_mode = pd->settings.track_mode;
> -	wp->write_type = pd->settings.write_type;
> -	wp->data_block_type = pd->settings.block_mode;
> -
> -	wp->multi_session = 0;
> -
> -#ifdef PACKET_USE_LS
> -	wp->link_size = 7;
> -	wp->ls_v = 1;
> -#endif
> -
> -	if (wp->data_block_type == PACKET_BLOCK_MODE1) {
> -		wp->session_format = 0;
> -		wp->subhdr2 = 0x20;
> -	} else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
> -		wp->session_format = 0x20;
> -		wp->subhdr2 = 8;
> -#if 0
> -		wp->mcn[0] = 0x80;
> -		memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
> -#endif
> -	} else {
> -		/*
> -		 * paranoia
> -		 */
> -		pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
> -		return 1;
> -	}
> -	wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
> -
> -	cgc.buflen = cgc.cmd[8] = size;
> -	ret = pkt_mode_select(pd, &cgc);
> -	if (ret) {
> -		pkt_dump_sense(pd, &cgc);
> -		return ret;
> -	}
> -
> -	pkt_print_settings(pd);
> -	return 0;
> -}
> -
> -/*
> - * 1 -- we can write to this track, 0 -- we can't
> - */
> -static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
> -{
> -	switch (pd->mmc3_profile) {
> -		case 0x1a: /* DVD+RW */
> -		case 0x12: /* DVD-RAM */
> -			/* The track is always writable on DVD+RW/DVD-RAM */
> -			return 1;
> -		default:
> -			break;
> -	}
> -
> -	if (!ti->packet || !ti->fp)
> -		return 0;
> -
> -	/*
> -	 * "good" settings as per Mt Fuji.
> -	 */
> -	if (ti->rt == 0 && ti->blank == 0)
> -		return 1;
> -
> -	if (ti->rt == 0 && ti->blank == 1)
> -		return 1;
> -
> -	if (ti->rt == 1 && ti->blank == 0)
> -		return 1;
> -
> -	pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
> -	return 0;
> -}
> -
> -/*
> - * 1 -- we can write to this disc, 0 -- we can't
> - */
> -static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
> -{
> -	switch (pd->mmc3_profile) {
> -		case 0x0a: /* CD-RW */
> -		case 0xffff: /* MMC3 not supported */
> -			break;
> -		case 0x1a: /* DVD+RW */
> -		case 0x13: /* DVD-RW */
> -		case 0x12: /* DVD-RAM */
> -			return 1;
> -		default:
> -			pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
> -				pd->mmc3_profile);
> -			return 0;
> -	}
> -
> -	/*
> -	 * for disc type 0xff we should probably reserve a new track.
> -	 * but i'm not sure, should we leave this to user apps? probably.
> -	 */
> -	if (di->disc_type == 0xff) {
> -		pkt_notice(pd, "unknown disc - no track?\n");
> -		return 0;
> -	}
> -
> -	if (di->disc_type != 0x20 && di->disc_type != 0) {
> -		pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
> -		return 0;
> -	}
> -
> -	if (di->erasable == 0) {
> -		pkt_notice(pd, "disc not erasable\n");
> -		return 0;
> -	}
> -
> -	if (di->border_status == PACKET_SESSION_RESERVED) {
> -		pkt_err(pd, "can't write to last track (reserved)\n");
> -		return 0;
> -	}
> -
> -	return 1;
> -}
> -
> -static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
> -{
> -	struct packet_command cgc;
> -	unsigned char buf[12];
> -	disc_information di;
> -	track_information ti;
> -	int ret, track;
> -
> -	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
> -	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
> -	cgc.cmd[8] = 8;
> -	ret = pkt_generic_packet(pd, &cgc);
> -	pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
> -
> -	memset(&di, 0, sizeof(disc_information));
> -	memset(&ti, 0, sizeof(track_information));
> -
> -	ret = pkt_get_disc_info(pd, &di);
> -	if (ret) {
> -		pkt_err(pd, "failed get_disc\n");
> -		return ret;
> -	}
> -
> -	if (!pkt_writable_disc(pd, &di))
> -		return -EROFS;
> -
> -	pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
> -
> -	track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
> -	ret = pkt_get_track_info(pd, track, 1, &ti);
> -	if (ret) {
> -		pkt_err(pd, "failed get_track\n");
> -		return ret;
> -	}
> -
> -	if (!pkt_writable_track(pd, &ti)) {
> -		pkt_err(pd, "can't write to this track\n");
> -		return -EROFS;
> -	}
> -
> -	/*
> -	 * we keep packet size in 512 byte units, makes it easier to
> -	 * deal with request calculations.
> -	 */
> -	pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
> -	if (pd->settings.size == 0) {
> -		pkt_notice(pd, "detected zero packet size!\n");
> -		return -ENXIO;
> -	}
> -	if (pd->settings.size > PACKET_MAX_SECTORS) {
> -		pkt_err(pd, "packet size is too big\n");
> -		return -EROFS;
> -	}
> -	pd->settings.fp = ti.fp;
> -	pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
> -
> -	if (ti.nwa_v) {
> -		pd->nwa = be32_to_cpu(ti.next_writable);
> -		set_bit(PACKET_NWA_VALID, &pd->flags);
> -	}
> -
> -	/*
> -	 * in theory we could use lra on -RW media as well and just zero
> -	 * blocks that haven't been written yet, but in practice that
> -	 * is just a no-go. we'll use that for -R, naturally.
> -	 */
> -	if (ti.lra_v) {
> -		pd->lra = be32_to_cpu(ti.last_rec_address);
> -		set_bit(PACKET_LRA_VALID, &pd->flags);
> -	} else {
> -		pd->lra = 0xffffffff;
> -		set_bit(PACKET_LRA_VALID, &pd->flags);
> -	}
> -
> -	/*
> -	 * fine for now
> -	 */
> -	pd->settings.link_loss = 7;
> -	pd->settings.write_type = 0;	/* packet */
> -	pd->settings.track_mode = ti.track_mode;
> -
> -	/*
> -	 * mode1 or mode2 disc
> -	 */
> -	switch (ti.data_mode) {
> -		case PACKET_MODE1:
> -			pd->settings.block_mode = PACKET_BLOCK_MODE1;
> -			break;
> -		case PACKET_MODE2:
> -			pd->settings.block_mode = PACKET_BLOCK_MODE2;
> -			break;
> -		default:
> -			pkt_err(pd, "unknown data mode\n");
> -			return -EROFS;
> -	}
> -	return 0;
> -}
> -
> -/*
> - * enable/disable write caching on drive
> - */
> -static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
> -						int set)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	unsigned char buf[64];
> -	int ret;
> -
> -	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
> -	cgc.sshdr = &sshdr;
> -	cgc.buflen = pd->mode_offset + 12;
> -
> -	/*
> -	 * caching mode page might not be there, so quiet this command
> -	 */
> -	cgc.quiet = 1;
> -
> -	ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
> -	if (ret)
> -		return ret;
> -
> -	buf[pd->mode_offset + 10] |= (!!set << 2);
> -
> -	cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
> -	ret = pkt_mode_select(pd, &cgc);
> -	if (ret) {
> -		pkt_err(pd, "write caching control failed\n");
> -		pkt_dump_sense(pd, &cgc);
> -	} else if (!ret && set)
> -		pkt_notice(pd, "enabled write caching\n");
> -	return ret;
> -}
> -
> -static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
> -{
> -	struct packet_command cgc;
> -
> -	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
> -	cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
> -	cgc.cmd[4] = lockflag ? 1 : 0;
> -	return pkt_generic_packet(pd, &cgc);
> -}
> -
> -/*
> - * Returns drive maximum write speed
> - */
> -static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
> -						unsigned *write_speed)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	unsigned char buf[256+18];
> -	unsigned char *cap_buf;
> -	int ret, offset;
> -
> -	cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
> -	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
> -	cgc.sshdr = &sshdr;
> -
> -	ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
> -	if (ret) {
> -		cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
> -			     sizeof(struct mode_page_header);
> -		ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
> -		if (ret) {
> -			pkt_dump_sense(pd, &cgc);
> -			return ret;
> -		}
> -	}
> -
> -	offset = 20;			    /* Obsoleted field, used by older drives */
> -	if (cap_buf[1] >= 28)
> -		offset = 28;		    /* Current write speed selected */
> -	if (cap_buf[1] >= 30) {
> -		/* If the drive reports at least one "Logical Unit Write
> -		 * Speed Performance Descriptor Block", use the information
> -		 * in the first block. (contains the highest speed)
> -		 */
> -		int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
> -		if (num_spdb > 0)
> -			offset = 34;
> -	}
> -
> -	*write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
> -	return 0;
> -}
> -
> -/* These tables from cdrecord - I don't have orange book */
> -/* standard speed CD-RW (1-4x) */
> -static char clv_to_speed[16] = {
> -	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
> -	   0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
> -};
> -/* high speed CD-RW (-10x) */
> -static char hs_clv_to_speed[16] = {
> -	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
> -	   0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
> -};
> -/* ultra high speed CD-RW */
> -static char us_clv_to_speed[16] = {
> -	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
> -	   0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
> -};
> -
> -/*
> - * reads the maximum media speed from ATIP
> - */
> -static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
> -						unsigned *speed)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	unsigned char buf[64];
> -	unsigned int size, st, sp;
> -	int ret;
> -
> -	init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
> -	cgc.sshdr = &sshdr;
> -	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
> -	cgc.cmd[1] = 2;
> -	cgc.cmd[2] = 4; /* READ ATIP */
> -	cgc.cmd[8] = 2;
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret) {
> -		pkt_dump_sense(pd, &cgc);
> -		return ret;
> -	}
> -	size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
> -	if (size > sizeof(buf))
> -		size = sizeof(buf);
> -
> -	init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
> -	cgc.sshdr = &sshdr;
> -	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
> -	cgc.cmd[1] = 2;
> -	cgc.cmd[2] = 4;
> -	cgc.cmd[8] = size;
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret) {
> -		pkt_dump_sense(pd, &cgc);
> -		return ret;
> -	}
> -
> -	if (!(buf[6] & 0x40)) {
> -		pkt_notice(pd, "disc type is not CD-RW\n");
> -		return 1;
> -	}
> -	if (!(buf[6] & 0x4)) {
> -		pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
> -		return 1;
> -	}
> -
> -	st = (buf[6] >> 3) & 0x7; /* disc sub-type */
> -
> -	sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
> -
> -	/* Info from cdrecord */
> -	switch (st) {
> -		case 0: /* standard speed */
> -			*speed = clv_to_speed[sp];
> -			break;
> -		case 1: /* high speed */
> -			*speed = hs_clv_to_speed[sp];
> -			break;
> -		case 2: /* ultra high speed */
> -			*speed = us_clv_to_speed[sp];
> -			break;
> -		default:
> -			pkt_notice(pd, "unknown disc sub-type %d\n", st);
> -			return 1;
> -	}
> -	if (*speed) {
> -		pkt_info(pd, "maximum media speed: %d\n", *speed);
> -		return 0;
> -	} else {
> -		pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
> -		return 1;
> -	}
> -}
> -
> -static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
> -{
> -	struct packet_command cgc;
> -	struct scsi_sense_hdr sshdr;
> -	int ret;
> -
> -	pkt_dbg(2, pd, "Performing OPC\n");
> -
> -	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
> -	cgc.sshdr = &sshdr;
> -	cgc.timeout = 60*HZ;
> -	cgc.cmd[0] = GPCMD_SEND_OPC;
> -	cgc.cmd[1] = 1;
> -	ret = pkt_generic_packet(pd, &cgc);
> -	if (ret)
> -		pkt_dump_sense(pd, &cgc);
> -	return ret;
> -}
> -
> -static int pkt_open_write(struct pktcdvd_device *pd)
> -{
> -	int ret;
> -	unsigned int write_speed, media_write_speed, read_speed;
> -
> -	ret = pkt_probe_settings(pd);
> -	if (ret) {
> -		pkt_dbg(2, pd, "failed probe\n");
> -		return ret;
> -	}
> -
> -	ret = pkt_set_write_settings(pd);
> -	if (ret) {
> -		pkt_dbg(1, pd, "failed saving write settings\n");
> -		return -EIO;
> -	}
> -
> -	pkt_write_caching(pd, USE_WCACHING);
> -
> -	ret = pkt_get_max_speed(pd, &write_speed);
> -	if (ret)
> -		write_speed = 16 * 177;
> -	switch (pd->mmc3_profile) {
> -		case 0x13: /* DVD-RW */
> -		case 0x1a: /* DVD+RW */
> -		case 0x12: /* DVD-RAM */
> -			pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
> -			break;
> -		default:
> -			ret = pkt_media_speed(pd, &media_write_speed);
> -			if (ret)
> -				media_write_speed = 16;
> -			write_speed = min(write_speed, media_write_speed * 177);
> -			pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
> -			break;
> -	}
> -	read_speed = write_speed;
> -
> -	ret = pkt_set_speed(pd, write_speed, read_speed);
> -	if (ret) {
> -		pkt_dbg(1, pd, "couldn't set write speed\n");
> -		return -EIO;
> -	}
> -	pd->write_speed = write_speed;
> -	pd->read_speed = read_speed;
> -
> -	ret = pkt_perform_opc(pd);
> -	if (ret) {
> -		pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
> -	}
> -
> -	return 0;
> -}
> -
> -/*
> - * called at open time.
> - */
> -static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
> -{
> -	int ret;
> -	long lba;
> -	struct request_queue *q;
> -	struct block_device *bdev;
> -
> -	/*
> -	 * We need to re-open the cdrom device without O_NONBLOCK to be able
> -	 * to read/write from/to it. It is already opened in O_NONBLOCK mode
> -	 * so open should not fail.
> -	 */
> -	bdev = blkdev_get_by_dev(pd->bdev->bd_dev, FMODE_READ | FMODE_EXCL, pd);
> -	if (IS_ERR(bdev)) {
> -		ret = PTR_ERR(bdev);
> -		goto out;
> -	}
> -
> -	ret = pkt_get_last_written(pd, &lba);
> -	if (ret) {
> -		pkt_err(pd, "pkt_get_last_written failed\n");
> -		goto out_putdev;
> -	}
> -
> -	set_capacity(pd->disk, lba << 2);
> -	set_capacity_and_notify(pd->bdev->bd_disk, lba << 2);
> -
> -	q = bdev_get_queue(pd->bdev);
> -	if (write) {
> -		ret = pkt_open_write(pd);
> -		if (ret)
> -			goto out_putdev;
> -		/*
> -		 * Some CDRW drives can not handle writes larger than one packet,
> -		 * even if the size is a multiple of the packet size.
> -		 */
> -		blk_queue_max_hw_sectors(q, pd->settings.size);
> -		set_bit(PACKET_WRITABLE, &pd->flags);
> -	} else {
> -		pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
> -		clear_bit(PACKET_WRITABLE, &pd->flags);
> -	}
> -
> -	ret = pkt_set_segment_merging(pd, q);
> -	if (ret)
> -		goto out_putdev;
> -
> -	if (write) {
> -		if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
> -			pkt_err(pd, "not enough memory for buffers\n");
> -			ret = -ENOMEM;
> -			goto out_putdev;
> -		}
> -		pkt_info(pd, "%lukB available on disc\n", lba << 1);
> -	}
> -
> -	return 0;
> -
> -out_putdev:
> -	blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
> -out:
> -	return ret;
> -}
> -
> -/*
> - * called when the device is closed. makes sure that the device flushes
> - * the internal cache before we close.
> - */
> -static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
> -{
> -	if (flush && pkt_flush_cache(pd))
> -		pkt_dbg(1, pd, "not flushing cache\n");
> -
> -	pkt_lock_door(pd, 0);
> -
> -	pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
> -	blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
> -
> -	pkt_shrink_pktlist(pd);
> -}
> -
> -static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
> -{
> -	if (dev_minor >= MAX_WRITERS)
> -		return NULL;
> -
> -	dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
> -	return pkt_devs[dev_minor];
> -}
> -
> -static int pkt_open(struct block_device *bdev, fmode_t mode)
> -{
> -	struct pktcdvd_device *pd = NULL;
> -	int ret;
> -
> -	mutex_lock(&pktcdvd_mutex);
> -	mutex_lock(&ctl_mutex);
> -	pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
> -	if (!pd) {
> -		ret = -ENODEV;
> -		goto out;
> -	}
> -	BUG_ON(pd->refcnt < 0);
> -
> -	pd->refcnt++;
> -	if (pd->refcnt > 1) {
> -		if ((mode & FMODE_WRITE) &&
> -		    !test_bit(PACKET_WRITABLE, &pd->flags)) {
> -			ret = -EBUSY;
> -			goto out_dec;
> -		}
> -	} else {
> -		ret = pkt_open_dev(pd, mode & FMODE_WRITE);
> -		if (ret)
> -			goto out_dec;
> -		/*
> -		 * needed here as well, since ext2 (among others) may change
> -		 * the blocksize at mount time
> -		 */
> -		set_blocksize(bdev, CD_FRAMESIZE);
> -	}
> -
> -	mutex_unlock(&ctl_mutex);
> -	mutex_unlock(&pktcdvd_mutex);
> -	return 0;
> -
> -out_dec:
> -	pd->refcnt--;
> -out:
> -	mutex_unlock(&ctl_mutex);
> -	mutex_unlock(&pktcdvd_mutex);
> -	return ret;
> -}
> -
> -static void pkt_close(struct gendisk *disk, fmode_t mode)
> -{
> -	struct pktcdvd_device *pd = disk->private_data;
> -
> -	mutex_lock(&pktcdvd_mutex);
> -	mutex_lock(&ctl_mutex);
> -	pd->refcnt--;
> -	BUG_ON(pd->refcnt < 0);
> -	if (pd->refcnt == 0) {
> -		int flush = test_bit(PACKET_WRITABLE, &pd->flags);
> -		pkt_release_dev(pd, flush);
> -	}
> -	mutex_unlock(&ctl_mutex);
> -	mutex_unlock(&pktcdvd_mutex);
> -}
> -
> -
> -static void pkt_end_io_read_cloned(struct bio *bio)
> -{
> -	struct packet_stacked_data *psd = bio->bi_private;
> -	struct pktcdvd_device *pd = psd->pd;
> -
> -	psd->bio->bi_status = bio->bi_status;
> -	bio_put(bio);
> -	bio_endio(psd->bio);
> -	mempool_free(psd, &psd_pool);
> -	pkt_bio_finished(pd);
> -}
> -
> -static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
> -{
> -	struct bio *cloned_bio =
> -		bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set);
> -	struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
> -
> -	psd->pd = pd;
> -	psd->bio = bio;
> -	cloned_bio->bi_private = psd;
> -	cloned_bio->bi_end_io = pkt_end_io_read_cloned;
> -	pd->stats.secs_r += bio_sectors(bio);
> -	pkt_queue_bio(pd, cloned_bio);
> -}
> -
> -static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
> -{
> -	struct pktcdvd_device *pd = q->queuedata;
> -	sector_t zone;
> -	struct packet_data *pkt;
> -	int was_empty, blocked_bio;
> -	struct pkt_rb_node *node;
> -
> -	zone = get_zone(bio->bi_iter.bi_sector, pd);
> -
> -	/*
> -	 * If we find a matching packet in state WAITING or READ_WAIT, we can
> -	 * just append this bio to that packet.
> -	 */
> -	spin_lock(&pd->cdrw.active_list_lock);
> -	blocked_bio = 0;
> -	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
> -		if (pkt->sector == zone) {
> -			spin_lock(&pkt->lock);
> -			if ((pkt->state == PACKET_WAITING_STATE) ||
> -			    (pkt->state == PACKET_READ_WAIT_STATE)) {
> -				bio_list_add(&pkt->orig_bios, bio);
> -				pkt->write_size +=
> -					bio->bi_iter.bi_size / CD_FRAMESIZE;
> -				if ((pkt->write_size >= pkt->frames) &&
> -				    (pkt->state == PACKET_WAITING_STATE)) {
> -					atomic_inc(&pkt->run_sm);
> -					wake_up(&pd->wqueue);
> -				}
> -				spin_unlock(&pkt->lock);
> -				spin_unlock(&pd->cdrw.active_list_lock);
> -				return;
> -			} else {
> -				blocked_bio = 1;
> -			}
> -			spin_unlock(&pkt->lock);
> -		}
> -	}
> -	spin_unlock(&pd->cdrw.active_list_lock);
> -
> -	/*
> -	 * Test if there is enough room left in the bio work queue
> -	 * (queue size >= congestion on mark).
> -	 * If not, wait till the work queue size is below the congestion off mark.
> -	 */
> -	spin_lock(&pd->lock);
> -	if (pd->write_congestion_on > 0
> -	    && pd->bio_queue_size >= pd->write_congestion_on) {
> -		struct wait_bit_queue_entry wqe;
> -
> -		init_wait_var_entry(&wqe, &pd->congested, 0);
> -		for (;;) {
> -			prepare_to_wait_event(__var_waitqueue(&pd->congested),
> -					      &wqe.wq_entry,
> -					      TASK_UNINTERRUPTIBLE);
> -			if (pd->bio_queue_size <= pd->write_congestion_off)
> -				break;
> -			pd->congested = true;
> -			spin_unlock(&pd->lock);
> -			schedule();
> -			spin_lock(&pd->lock);
> -		}
> -	}
> -	spin_unlock(&pd->lock);
> -
> -	/*
> -	 * No matching packet found. Store the bio in the work queue.
> -	 */
> -	node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
> -	node->bio = bio;
> -	spin_lock(&pd->lock);
> -	BUG_ON(pd->bio_queue_size < 0);
> -	was_empty = (pd->bio_queue_size == 0);
> -	pkt_rbtree_insert(pd, node);
> -	spin_unlock(&pd->lock);
> -
> -	/*
> -	 * Wake up the worker thread.
> -	 */
> -	atomic_set(&pd->scan_queue, 1);
> -	if (was_empty) {
> -		/* This wake_up is required for correct operation */
> -		wake_up(&pd->wqueue);
> -	} else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
> -		/*
> -		 * This wake up is not required for correct operation,
> -		 * but improves performance in some cases.
> -		 */
> -		wake_up(&pd->wqueue);
> -	}
> -}
> -
> -static void pkt_submit_bio(struct bio *bio)
> -{
> -	struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata;
> -	struct bio *split;
> -
> -	bio = bio_split_to_limits(bio);
> -
> -	pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
> -		(unsigned long long)bio->bi_iter.bi_sector,
> -		(unsigned long long)bio_end_sector(bio));
> -
> -	/*
> -	 * Clone READ bios so we can have our own bi_end_io callback.
> -	 */
> -	if (bio_data_dir(bio) == READ) {
> -		pkt_make_request_read(pd, bio);
> -		return;
> -	}
> -
> -	if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
> -		pkt_notice(pd, "WRITE for ro device (%llu)\n",
> -			   (unsigned long long)bio->bi_iter.bi_sector);
> -		goto end_io;
> -	}
> -
> -	if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
> -		pkt_err(pd, "wrong bio size\n");
> -		goto end_io;
> -	}
> -
> -	do {
> -		sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
> -		sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
> -
> -		if (last_zone != zone) {
> -			BUG_ON(last_zone != zone + pd->settings.size);
> -
> -			split = bio_split(bio, last_zone -
> -					  bio->bi_iter.bi_sector,
> -					  GFP_NOIO, &pkt_bio_set);
> -			bio_chain(split, bio);
> -		} else {
> -			split = bio;
> -		}
> -
> -		pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split);
> -	} while (split != bio);
> -
> -	return;
> -end_io:
> -	bio_io_error(bio);
> -}
> -
> -static void pkt_init_queue(struct pktcdvd_device *pd)
> -{
> -	struct request_queue *q = pd->disk->queue;
> -
> -	blk_queue_logical_block_size(q, CD_FRAMESIZE);
> -	blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
> -	q->queuedata = pd;
> -}
> -
> -static int pkt_seq_show(struct seq_file *m, void *p)
> -{
> -	struct pktcdvd_device *pd = m->private;
> -	char *msg;
> -	int states[PACKET_NUM_STATES];
> -
> -	seq_printf(m, "Writer %s mapped to %pg:\n", pd->name, pd->bdev);
> -
> -	seq_printf(m, "\nSettings:\n");
> -	seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
> -
> -	if (pd->settings.write_type == 0)
> -		msg = "Packet";
> -	else
> -		msg = "Unknown";
> -	seq_printf(m, "\twrite type:\t\t%s\n", msg);
> -
> -	seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
> -	seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
> -
> -	seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
> -
> -	if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
> -		msg = "Mode 1";
> -	else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
> -		msg = "Mode 2";
> -	else
> -		msg = "Unknown";
> -	seq_printf(m, "\tblock mode:\t\t%s\n", msg);
> -
> -	seq_printf(m, "\nStatistics:\n");
> -	seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
> -	seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
> -	seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
> -	seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
> -	seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
> -
> -	seq_printf(m, "\nMisc:\n");
> -	seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
> -	seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
> -	seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
> -	seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
> -	seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
> -	seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
> -
> -	seq_printf(m, "\nQueue state:\n");
> -	seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
> -	seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
> -	seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
> -
> -	pkt_count_states(pd, states);
> -	seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
> -		   states[0], states[1], states[2], states[3], states[4], states[5]);
> -
> -	seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
> -			pd->write_congestion_off,
> -			pd->write_congestion_on);
> -	return 0;
> -}
> -
> -static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
> -{
> -	int i;
> -	struct block_device *bdev;
> -	struct scsi_device *sdev;
> -
> -	if (pd->pkt_dev == dev) {
> -		pkt_err(pd, "recursive setup not allowed\n");
> -		return -EBUSY;
> -	}
> -	for (i = 0; i < MAX_WRITERS; i++) {
> -		struct pktcdvd_device *pd2 = pkt_devs[i];
> -		if (!pd2)
> -			continue;
> -		if (pd2->bdev->bd_dev == dev) {
> -			pkt_err(pd, "%pg already setup\n", pd2->bdev);
> -			return -EBUSY;
> -		}
> -		if (pd2->pkt_dev == dev) {
> -			pkt_err(pd, "can't chain pktcdvd devices\n");
> -			return -EBUSY;
> -		}
> -	}
> -
> -	bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_NDELAY, NULL);
> -	if (IS_ERR(bdev))
> -		return PTR_ERR(bdev);
> -	sdev = scsi_device_from_queue(bdev->bd_disk->queue);
> -	if (!sdev) {
> -		blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
> -		return -EINVAL;
> -	}
> -	put_device(&sdev->sdev_gendev);
> -
> -	/* This is safe, since we have a reference from open(). */
> -	__module_get(THIS_MODULE);
> -
> -	pd->bdev = bdev;
> -	set_blocksize(bdev, CD_FRAMESIZE);
> -
> -	pkt_init_queue(pd);
> -
> -	atomic_set(&pd->cdrw.pending_bios, 0);
> -	pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
> -	if (IS_ERR(pd->cdrw.thread)) {
> -		pkt_err(pd, "can't start kernel thread\n");
> -		goto out_mem;
> -	}
> -
> -	proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd);
> -	pkt_dbg(1, pd, "writer mapped to %pg\n", bdev);
> -	return 0;
> -
> -out_mem:
> -	blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
> -	/* This is safe: open() is still holding a reference. */
> -	module_put(THIS_MODULE);
> -	return -ENOMEM;
> -}
> -
> -static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
> -{
> -	struct pktcdvd_device *pd = bdev->bd_disk->private_data;
> -	int ret;
> -
> -	pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
> -		cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
> -
> -	mutex_lock(&pktcdvd_mutex);
> -	switch (cmd) {
> -	case CDROMEJECT:
> -		/*
> -		 * The door gets locked when the device is opened, so we
> -		 * have to unlock it or else the eject command fails.
> -		 */
> -		if (pd->refcnt == 1)
> -			pkt_lock_door(pd, 0);
> -		fallthrough;
> -	/*
> -	 * forward selected CDROM ioctls to CD-ROM, for UDF
> -	 */
> -	case CDROMMULTISESSION:
> -	case CDROMREADTOCENTRY:
> -	case CDROM_LAST_WRITTEN:
> -	case CDROM_SEND_PACKET:
> -	case SCSI_IOCTL_SEND_COMMAND:
> -		if (!bdev->bd_disk->fops->ioctl)
> -			ret = -ENOTTY;
> -		else
> -			ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
> -		break;
> -	default:
> -		pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
> -		ret = -ENOTTY;
> -	}
> -	mutex_unlock(&pktcdvd_mutex);
> -
> -	return ret;
> -}
> -
> -static unsigned int pkt_check_events(struct gendisk *disk,
> -				     unsigned int clearing)
> -{
> -	struct pktcdvd_device *pd = disk->private_data;
> -	struct gendisk *attached_disk;
> -
> -	if (!pd)
> -		return 0;
> -	if (!pd->bdev)
> -		return 0;
> -	attached_disk = pd->bdev->bd_disk;
> -	if (!attached_disk || !attached_disk->fops->check_events)
> -		return 0;
> -	return attached_disk->fops->check_events(attached_disk, clearing);
> -}
> -
> -static char *pkt_devnode(struct gendisk *disk, umode_t *mode)
> -{
> -	return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name);
> -}
> -
> -static const struct block_device_operations pktcdvd_ops = {
> -	.owner =		THIS_MODULE,
> -	.submit_bio =		pkt_submit_bio,
> -	.open =			pkt_open,
> -	.release =		pkt_close,
> -	.ioctl =		pkt_ioctl,
> -	.compat_ioctl =		blkdev_compat_ptr_ioctl,
> -	.check_events =		pkt_check_events,
> -	.devnode =		pkt_devnode,
> -};
> -
> -/*
> - * Set up mapping from pktcdvd device to CD-ROM device.
> - */
> -static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
> -{
> -	int idx;
> -	int ret = -ENOMEM;
> -	struct pktcdvd_device *pd;
> -	struct gendisk *disk;
> -
> -	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> -	for (idx = 0; idx < MAX_WRITERS; idx++)
> -		if (!pkt_devs[idx])
> -			break;
> -	if (idx == MAX_WRITERS) {
> -		pr_err("max %d writers supported\n", MAX_WRITERS);
> -		ret = -EBUSY;
> -		goto out_mutex;
> -	}
> -
> -	pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
> -	if (!pd)
> -		goto out_mutex;
> -
> -	ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
> -					sizeof(struct pkt_rb_node));
> -	if (ret)
> -		goto out_mem;
> -
> -	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
> -	INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
> -	spin_lock_init(&pd->cdrw.active_list_lock);
> -
> -	spin_lock_init(&pd->lock);
> -	spin_lock_init(&pd->iosched.lock);
> -	bio_list_init(&pd->iosched.read_queue);
> -	bio_list_init(&pd->iosched.write_queue);
> -	sprintf(pd->name, DRIVER_NAME"%d", idx);
> -	init_waitqueue_head(&pd->wqueue);
> -	pd->bio_queue = RB_ROOT;
> -
> -	pd->write_congestion_on  = write_congestion_on;
> -	pd->write_congestion_off = write_congestion_off;
> -
> -	ret = -ENOMEM;
> -	disk = blk_alloc_disk(NUMA_NO_NODE);
> -	if (!disk)
> -		goto out_mem;
> -	pd->disk = disk;
> -	disk->major = pktdev_major;
> -	disk->first_minor = idx;
> -	disk->minors = 1;
> -	disk->fops = &pktcdvd_ops;
> -	disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
> -	strcpy(disk->disk_name, pd->name);
> -	disk->private_data = pd;
> -
> -	pd->pkt_dev = MKDEV(pktdev_major, idx);
> -	ret = pkt_new_dev(pd, dev);
> -	if (ret)
> -		goto out_mem2;
> -
> -	/* inherit events of the host device */
> -	disk->events = pd->bdev->bd_disk->events;
> -
> -	ret = add_disk(disk);
> -	if (ret)
> -		goto out_mem2;
> -
> -	pkt_sysfs_dev_new(pd);
> -	pkt_debugfs_dev_new(pd);
> -
> -	pkt_devs[idx] = pd;
> -	if (pkt_dev)
> -		*pkt_dev = pd->pkt_dev;
> -
> -	mutex_unlock(&ctl_mutex);
> -	return 0;
> -
> -out_mem2:
> -	put_disk(disk);
> -out_mem:
> -	mempool_exit(&pd->rb_pool);
> -	kfree(pd);
> -out_mutex:
> -	mutex_unlock(&ctl_mutex);
> -	pr_err("setup of pktcdvd device failed\n");
> -	return ret;
> -}
> -
> -/*
> - * Tear down mapping from pktcdvd device to CD-ROM device.
> - */
> -static int pkt_remove_dev(dev_t pkt_dev)
> -{
> -	struct pktcdvd_device *pd;
> -	int idx;
> -	int ret = 0;
> -
> -	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> -	for (idx = 0; idx < MAX_WRITERS; idx++) {
> -		pd = pkt_devs[idx];
> -		if (pd && (pd->pkt_dev == pkt_dev))
> -			break;
> -	}
> -	if (idx == MAX_WRITERS) {
> -		pr_debug("dev not setup\n");
> -		ret = -ENXIO;
> -		goto out;
> -	}
> -
> -	if (pd->refcnt > 0) {
> -		ret = -EBUSY;
> -		goto out;
> -	}
> -	if (!IS_ERR(pd->cdrw.thread))
> -		kthread_stop(pd->cdrw.thread);
> -
> -	pkt_devs[idx] = NULL;
> -
> -	pkt_debugfs_dev_remove(pd);
> -	pkt_sysfs_dev_remove(pd);
> -
> -	blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
> -
> -	remove_proc_entry(pd->name, pkt_proc);
> -	pkt_dbg(1, pd, "writer unmapped\n");
> -
> -	del_gendisk(pd->disk);
> -	put_disk(pd->disk);
> -
> -	mempool_exit(&pd->rb_pool);
> -	kfree(pd);
> -
> -	/* This is safe: open() is still holding a reference. */
> -	module_put(THIS_MODULE);
> -
> -out:
> -	mutex_unlock(&ctl_mutex);
> -	return ret;
> -}
> -
> -static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
> -{
> -	struct pktcdvd_device *pd;
> -
> -	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> -	pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
> -	if (pd) {
> -		ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
> -		ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
> -	} else {
> -		ctrl_cmd->dev = 0;
> -		ctrl_cmd->pkt_dev = 0;
> -	}
> -	ctrl_cmd->num_devices = MAX_WRITERS;
> -
> -	mutex_unlock(&ctl_mutex);
> -}
> -
> -static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> -{
> -	void __user *argp = (void __user *)arg;
> -	struct pkt_ctrl_command ctrl_cmd;
> -	int ret = 0;
> -	dev_t pkt_dev = 0;
> -
> -	if (cmd != PACKET_CTRL_CMD)
> -		return -ENOTTY;
> -
> -	if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
> -		return -EFAULT;
> -
> -	switch (ctrl_cmd.command) {
> -	case PKT_CTRL_CMD_SETUP:
> -		if (!capable(CAP_SYS_ADMIN))
> -			return -EPERM;
> -		ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
> -		ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
> -		break;
> -	case PKT_CTRL_CMD_TEARDOWN:
> -		if (!capable(CAP_SYS_ADMIN))
> -			return -EPERM;
> -		ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
> -		break;
> -	case PKT_CTRL_CMD_STATUS:
> -		pkt_get_status(&ctrl_cmd);
> -		break;
> -	default:
> -		return -ENOTTY;
> -	}
> -
> -	if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
> -		return -EFAULT;
> -	return ret;
> -}
> -
> -#ifdef CONFIG_COMPAT
> -static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> -{
> -	return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
> -}
> -#endif
> -
> -static const struct file_operations pkt_ctl_fops = {
> -	.open		= nonseekable_open,
> -	.unlocked_ioctl	= pkt_ctl_ioctl,
> -#ifdef CONFIG_COMPAT
> -	.compat_ioctl	= pkt_ctl_compat_ioctl,
> -#endif
> -	.owner		= THIS_MODULE,
> -	.llseek		= no_llseek,
> -};
> -
> -static struct miscdevice pkt_misc = {
> -	.minor 		= MISC_DYNAMIC_MINOR,
> -	.name  		= DRIVER_NAME,
> -	.nodename	= "pktcdvd/control",
> -	.fops  		= &pkt_ctl_fops
> -};
> -
> -static int __init pkt_init(void)
> -{
> -	int ret;
> -
> -	mutex_init(&ctl_mutex);
> -
> -	ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
> -				    sizeof(struct packet_stacked_data));
> -	if (ret)
> -		return ret;
> -	ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
> -	if (ret) {
> -		mempool_exit(&psd_pool);
> -		return ret;
> -	}
> -
> -	ret = register_blkdev(pktdev_major, DRIVER_NAME);
> -	if (ret < 0) {
> -		pr_err("unable to register block device\n");
> -		goto out2;
> -	}
> -	if (!pktdev_major)
> -		pktdev_major = ret;
> -
> -	ret = pkt_sysfs_init();
> -	if (ret)
> -		goto out;
> -
> -	pkt_debugfs_init();
> -
> -	ret = misc_register(&pkt_misc);
> -	if (ret) {
> -		pr_err("unable to register misc device\n");
> -		goto out_misc;
> -	}
> -
> -	pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
> -
> -	return 0;
> -
> -out_misc:
> -	pkt_debugfs_cleanup();
> -	pkt_sysfs_cleanup();
> -out:
> -	unregister_blkdev(pktdev_major, DRIVER_NAME);
> -out2:
> -	mempool_exit(&psd_pool);
> -	bioset_exit(&pkt_bio_set);
> -	return ret;
> -}
> -
> -static void __exit pkt_exit(void)
> -{
> -	remove_proc_entry("driver/"DRIVER_NAME, NULL);
> -	misc_deregister(&pkt_misc);
> -
> -	pkt_debugfs_cleanup();
> -	pkt_sysfs_cleanup();
> -
> -	unregister_blkdev(pktdev_major, DRIVER_NAME);
> -	mempool_exit(&psd_pool);
> -	bioset_exit(&pkt_bio_set);
> -}
> -
> -MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
> -MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
> -MODULE_LICENSE("GPL");
> -
> -module_init(pkt_init);
> -module_exit(pkt_exit);
> diff --git a/include/linux/pktcdvd.h b/include/linux/pktcdvd.h
> deleted file mode 100644
> index f9c5ac80d59b..000000000000
> --- a/include/linux/pktcdvd.h
> +++ /dev/null
> @@ -1,197 +0,0 @@
> -/*
> - * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
> - * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
> - *
> - * May be copied or modified under the terms of the GNU General Public
> - * License.  See linux/COPYING for more information.
> - *
> - * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
> - * DVD-RW devices.
> - *
> - */
> -#ifndef __PKTCDVD_H
> -#define __PKTCDVD_H
> -
> -#include <linux/blkdev.h>
> -#include <linux/completion.h>
> -#include <linux/cdrom.h>
> -#include <linux/kobject.h>
> -#include <linux/sysfs.h>
> -#include <linux/mempool.h>
> -#include <uapi/linux/pktcdvd.h>
> -
> -/* default bio write queue congestion marks */
> -#define PKT_WRITE_CONGESTION_ON    10000
> -#define PKT_WRITE_CONGESTION_OFF   9000
> -
> -
> -struct packet_settings
> -{
> -	__u32			size;		/* packet size in (512 byte) sectors */
> -	__u8			fp;		/* fixed packets */
> -	__u8			link_loss;	/* the rest is specified
> -						 * as per Mt Fuji */
> -	__u8			write_type;
> -	__u8			track_mode;
> -	__u8			block_mode;
> -};
> -
> -/*
> - * Very crude stats for now
> - */
> -struct packet_stats
> -{
> -	unsigned long		pkt_started;
> -	unsigned long		pkt_ended;
> -	unsigned long		secs_w;
> -	unsigned long		secs_rg;
> -	unsigned long		secs_r;
> -};
> -
> -struct packet_cdrw
> -{
> -	struct list_head	pkt_free_list;
> -	struct list_head	pkt_active_list;
> -	spinlock_t		active_list_lock; /* Serialize access to pkt_active_list */
> -	struct task_struct	*thread;
> -	atomic_t		pending_bios;
> -};
> -
> -/*
> - * Switch to high speed reading after reading this many kilobytes
> - * with no interspersed writes.
> - */
> -#define HI_SPEED_SWITCH 512
> -
> -struct packet_iosched
> -{
> -	atomic_t		attention;	/* Set to non-zero when queue processing is needed */
> -	int			writing;	/* Non-zero when writing, zero when reading */
> -	spinlock_t		lock;		/* Protecting read/write queue manipulations */
> -	struct bio_list		read_queue;
> -	struct bio_list		write_queue;
> -	sector_t		last_write;	/* The sector where the last write ended */
> -	int			successive_reads;
> -};
> -
> -/*
> - * 32 buffers of 2048 bytes
> - */
> -#if (PAGE_SIZE % CD_FRAMESIZE) != 0
> -#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
> -#endif
> -#define PACKET_MAX_SIZE		128
> -#define FRAMES_PER_PAGE		(PAGE_SIZE / CD_FRAMESIZE)
> -#define PACKET_MAX_SECTORS	(PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
> -
> -enum packet_data_state {
> -	PACKET_IDLE_STATE,			/* Not used at the moment */
> -	PACKET_WAITING_STATE,			/* Waiting for more bios to arrive, so */
> -						/* we don't have to do as much */
> -						/* data gathering */
> -	PACKET_READ_WAIT_STATE,			/* Waiting for reads to fill in holes */
> -	PACKET_WRITE_WAIT_STATE,		/* Waiting for the write to complete */
> -	PACKET_RECOVERY_STATE,			/* Recover after read/write errors */
> -	PACKET_FINISHED_STATE,			/* After write has finished */
> -
> -	PACKET_NUM_STATES			/* Number of possible states */
> -};
> -
> -/*
> - * Information needed for writing a single packet
> - */
> -struct pktcdvd_device;
> -
> -struct packet_data
> -{
> -	struct list_head	list;
> -
> -	spinlock_t		lock;		/* Lock protecting state transitions and */
> -						/* orig_bios list */
> -
> -	struct bio_list		orig_bios;	/* Original bios passed to pkt_make_request */
> -						/* that will be handled by this packet */
> -	int			write_size;	/* Total size of all bios in the orig_bios */
> -						/* list, measured in number of frames */
> -
> -	struct bio		*w_bio;		/* The bio we will send to the real CD */
> -						/* device once we have all data for the */
> -						/* packet we are going to write */
> -	sector_t		sector;		/* First sector in this packet */
> -	int			frames;		/* Number of frames in this packet */
> -
> -	enum packet_data_state	state;		/* Current state */
> -	atomic_t		run_sm;		/* Incremented whenever the state */
> -						/* machine needs to be run */
> -	long			sleep_time;	/* Set this to non-zero to make the state */
> -						/* machine run after this many jiffies. */
> -
> -	atomic_t		io_wait;	/* Number of pending IO operations */
> -	atomic_t		io_errors;	/* Number of read/write errors during IO */
> -
> -	struct bio		*r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
> -	struct page		*pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
> -
> -	int			cache_valid;	/* If non-zero, the data for the zone defined */
> -						/* by the sector variable is completely cached */
> -						/* in the pages[] vector. */
> -
> -	int			id;		/* ID number for debugging */
> -	struct pktcdvd_device	*pd;
> -};
> -
> -struct pkt_rb_node {
> -	struct rb_node		rb_node;
> -	struct bio		*bio;
> -};
> -
> -struct packet_stacked_data
> -{
> -	struct bio		*bio;		/* Original read request bio */
> -	struct pktcdvd_device	*pd;
> -};
> -#define PSD_POOL_SIZE		64
> -
> -struct pktcdvd_device
> -{
> -	struct block_device	*bdev;		/* dev attached */
> -	dev_t			pkt_dev;	/* our dev */
> -	char			name[20];
> -	struct packet_settings	settings;
> -	struct packet_stats	stats;
> -	int			refcnt;		/* Open count */
> -	int			write_speed;	/* current write speed, kB/s */
> -	int			read_speed;	/* current read speed, kB/s */
> -	unsigned long		offset;		/* start offset */
> -	__u8			mode_offset;	/* 0 / 8 */
> -	__u8			type;
> -	unsigned long		flags;
> -	__u16			mmc3_profile;
> -	__u32			nwa;		/* next writable address */
> -	__u32			lra;		/* last recorded address */
> -	struct packet_cdrw	cdrw;
> -	wait_queue_head_t	wqueue;
> -
> -	spinlock_t		lock;		/* Serialize access to bio_queue */
> -	struct rb_root		bio_queue;	/* Work queue of bios we need to handle */
> -	int			bio_queue_size;	/* Number of nodes in bio_queue */
> -	bool			congested;	/* Someone is waiting for bio_queue_size
> -						 * to drop. */
> -	sector_t		current_sector;	/* Keep track of where the elevator is */
> -	atomic_t		scan_queue;	/* Set to non-zero when pkt_handle_queue */
> -						/* needs to be run. */
> -	mempool_t		rb_pool;	/* mempool for pkt_rb_node allocations */
> -
> -	struct packet_iosched   iosched;
> -	struct gendisk		*disk;
> -
> -	int			write_congestion_off;
> -	int			write_congestion_on;
> -
> -	struct device		*dev;		/* sysfs pktcdvd[0-7] dev */
> -
> -	struct dentry		*dfs_d_root;	/* debugfs: devname directory */
> -	struct dentry		*dfs_f_info;	/* debugfs: info file */
> -};
> -
> -#endif /* __PKTCDVD_H */
> diff --git a/include/uapi/linux/pktcdvd.h b/include/uapi/linux/pktcdvd.h
> deleted file mode 100644
> index 9cbb55d21c94..000000000000
> --- a/include/uapi/linux/pktcdvd.h
> +++ /dev/null
> @@ -1,112 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> -/*
> - * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
> - * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
> - *
> - * May be copied or modified under the terms of the GNU General Public
> - * License.  See linux/COPYING for more information.
> - *
> - * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
> - * DVD-RW devices.
> - *
> - */
> -#ifndef _UAPI__PKTCDVD_H
> -#define _UAPI__PKTCDVD_H
> -
> -#include <linux/types.h>
> -
> -/*
> - * 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
> - */
> -#define PACKET_DEBUG		1
> -
> -#define	MAX_WRITERS		8
> -
> -#define PKT_RB_POOL_SIZE	512
> -
> -/*
> - * How long we should hold a non-full packet before starting data gathering.
> - */
> -#define PACKET_WAIT_TIME	(HZ * 5 / 1000)
> -
> -/*
> - * use drive write caching -- we need deferred error handling to be
> - * able to successfully recover with this option (drive will return good
> - * status as soon as the cdb is validated).
> - */
> -#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
> -#define USE_WCACHING		1
> -#else
> -#define USE_WCACHING		0
> -#endif
> -
> -/*
> - * No user-servicable parts beyond this point ->
> - */
> -
> -/*
> - * device types
> - */
> -#define PACKET_CDR		1
> -#define	PACKET_CDRW		2
> -#define PACKET_DVDR		3
> -#define PACKET_DVDRW		4
> -
> -/*
> - * flags
> - */
> -#define PACKET_WRITABLE		1	/* pd is writable */
> -#define PACKET_NWA_VALID	2	/* next writable address valid */
> -#define PACKET_LRA_VALID	3	/* last recorded address valid */
> -#define PACKET_MERGE_SEGS	4	/* perform segment merging to keep */
> -					/* underlying cdrom device happy */
> -
> -/*
> - * Disc status -- from READ_DISC_INFO
> - */
> -#define PACKET_DISC_EMPTY	0
> -#define PACKET_DISC_INCOMPLETE	1
> -#define PACKET_DISC_COMPLETE	2
> -#define PACKET_DISC_OTHER	3
> -
> -/*
> - * write type, and corresponding data block type
> - */
> -#define PACKET_MODE1		1
> -#define PACKET_MODE2		2
> -#define PACKET_BLOCK_MODE1	8
> -#define PACKET_BLOCK_MODE2	10
> -
> -/*
> - * Last session/border status
> - */
> -#define PACKET_SESSION_EMPTY		0
> -#define PACKET_SESSION_INCOMPLETE	1
> -#define PACKET_SESSION_RESERVED		2
> -#define PACKET_SESSION_COMPLETE		3
> -
> -#define PACKET_MCN			"4a656e734178626f65323030300000"
> -
> -#undef PACKET_USE_LS
> -
> -#define PKT_CTRL_CMD_SETUP	0
> -#define PKT_CTRL_CMD_TEARDOWN	1
> -#define PKT_CTRL_CMD_STATUS	2
> -
> -struct pkt_ctrl_command {
> -	__u32 command;				/* in: Setup, teardown, status */
> -	__u32 dev_index;			/* in/out: Device index */
> -	__u32 dev;				/* in/out: Device nr for cdrw device */
> -	__u32 pkt_dev;				/* in/out: Device nr for packet device */
> -	__u32 num_devices;			/* out: Largest device index + 1 */
> -	__u32 padding;				/* Not used */
> -};
> -
> -/*
> - * packet ioctls
> - */
> -#define PACKET_IOCTL_MAGIC	('X')
> -#define PACKET_CTRL_CMD		_IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
> -
> -
> -#endif /* _UAPI__PKTCDVD_H */
> -- 
> 2.38.1
>