Revert "pktcdvd: remove driver."

This reverts commit f40eb99897af665f11858dd7b56edcb62c3f3c67. There are apparently still users out there of this driver. While we'd love to remove it to ease the maintenance burden, let's reinstate it for now until better (userspace) solutions can be developed.

Jens Axboe committed 3 years ago

Commit 4b83e991 parent 050a4f38 files · +3419 −0Browse files

Unified · Split

8 files

Documentation/ABI/testing/debugfs-pktcdvd +18 −0
Documentation/ABI/testing/sysfs-class-pktcdvd +97 −0
MAINTAINERS +7 −0
drivers/block/Kconfig +43 −0
drivers/block/Makefile +1 −0
drivers/block/pktcdvd.c +2944 −0
include/linux/pktcdvd.h +197 −0
include/uapi/linux/pktcdvd.h +112 −0

Documentation/ABI/testing/debugfs-pktcdvd+18−0

@@ -0,0 +1,18 @@
	1	+What: /sys/kernel/debug/pktcdvd/pktcdvd[0-7]
	2	+Date: Oct. 2006
	3	+KernelVersion: 2.6.20
	4	+Contact: Thomas Maier <balagi@justmail.de>
	5	+Description:
	6	+
	7	+The pktcdvd module (packet writing driver) creates
	8	+these files in debugfs:
	9	+
	10	+/sys/kernel/debug/pktcdvd/pktcdvd[0-7]/
	11	+
	12	+ ==== ====== ====================================
	13	+ info 0444 Lots of driver statistics and infos.
	14	+ ==== ====== ====================================
	15	+
	16	+Example::
	17	+
	18	+ cat /sys/kernel/debug/pktcdvd/pktcdvd0/info

Documentation/ABI/testing/sysfs-class-pktcdvd+97−0

@@ -0,0 +1,97 @@
	1	+sysfs interface
	2	+---------------
	3	+The pktcdvd module (packet writing driver) creates the following files in the
	4	+sysfs: (<devid> is in the format major:minor)
	5	+
	6	+What: /sys/class/pktcdvd/add
	7	+What: /sys/class/pktcdvd/remove
	8	+What: /sys/class/pktcdvd/device_map
	9	+Date: Oct. 2006
	10	+KernelVersion: 2.6.20
	11	+Contact: Thomas Maier <balagi@justmail.de>
	12	+Description:
	13	+
	14	+ ========== ==============================================
	15	+ add (WO) Write a block device id (major:minor) to
	16	+ create a new pktcdvd device and map it to the
	17	+ block device.
	18	+
	19	+ remove (WO) Write the pktcdvd device id (major:minor)
	20	+ to remove the pktcdvd device.
	21	+
	22	+ device_map (RO) Shows the device mapping in format:
	23	+ pktcdvd[0-7] <pktdevid> <blkdevid>
	24	+ ========== ==============================================
	25	+
	26	+
	27	+What: /sys/class/pktcdvd/pktcdvd[0-7]/dev
	28	+What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent
	29	+Date: Oct. 2006
	30	+KernelVersion: 2.6.20
	31	+Contact: Thomas Maier <balagi@justmail.de>
	32	+Description:
	33	+ dev: (RO) Device id
	34	+
	35	+ uevent: (WO) To send a uevent
	36	+
	37	+
	38	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
	39	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
	40	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
	41	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
	42	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
	43	+What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
	44	+Date: Oct. 2006
	45	+KernelVersion: 2.6.20
	46	+Contact: Thomas Maier <balagi@justmail.de>
	47	+Description:
	48	+ packets_started: (RO) Number of started packets.
	49	+
	50	+ packets_finished: (RO) Number of finished packets.
	51	+
	52	+ kb_written: (RO) kBytes written.
	53	+
	54	+ kb_read: (RO) kBytes read.
	55	+
	56	+ kb_read_gather: (RO) kBytes read to fill write packets.
	57	+
	58	+ reset: (WO) Write any value to it to reset
	59	+ pktcdvd device statistic values, like
	60	+ bytes read/written.
	61	+
	62	+
	63	+What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
	64	+What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
	65	+What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
	66	+Date: Oct. 2006
	67	+KernelVersion: 2.6.20
	68	+Contact: Thomas Maier <balagi@justmail.de>
	69	+Description:
	70	+ ============== ================================================
	71	+ size (RO) Contains the size of the bio write queue.
	72	+
	73	+ congestion_off (RW) If bio write queue size is below this mark,
	74	+ accept new bio requests from the block layer.
	75	+
	76	+ congestion_on (RW) If bio write queue size is higher as this
	77	+ mark, do no longer accept bio write requests
	78	+ from the block layer and wait till the pktcdvd
	79	+ device has processed enough bio's so that bio
	80	+ write queue size is below congestion off mark.
	81	+ A value of <= 0 disables congestion control.
	82	+ ============== ================================================
	83	+
	84	+
	85	+Example:
	86	+--------
	87	+To use the pktcdvd sysfs interface directly, you can do::
	88	+
	89	+ # create a new pktcdvd device mapped to /dev/hdc
	90	+ echo "22:0" >/sys/class/pktcdvd/add
	91	+ cat /sys/class/pktcdvd/device_map
	92	+ # assuming device pktcdvd0 was created, look at stat's
	93	+ cat /sys/class/pktcdvd/pktcdvd0/stat/kb_written
	94	+ # print the device id of the mapped block device
	95	+ fgrep pktcdvd0 /sys/class/pktcdvd/device_map
	96	+ # remove device, using pktcdvd0 device id 253:0
	97	+ echo "253:0" >/sys/class/pktcdvd/remove

MAINTAINERS+7−0

@@ -16520,6 +16520,13 @@ S: Supported · 16519 unmodified lines
16520	16520	F: Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
16521	16521	F: drivers/input/keyboard/pinephone-keyboard.c
16522	16522
	16523	+PKTCDVD DRIVER
	16524	+M: linux-block@vger.kernel.org
	16525	+S: Orphan
	16526	+F: drivers/block/pktcdvd.c
	16527	+F: include/linux/pktcdvd.h
	16528	+F: include/uapi/linux/pktcdvd.h
	16529	+
16523	16530	PLANTOWER PMS7003 AIR POLLUTION SENSOR DRIVER
16524	16531	M: Tomasz Duszynski <tduszyns@gmail.com>
16525	16532	S: Maintained

drivers/block/Kconfig+43−0

@@ -285,6 +285,49 @@ config BLK_DEV_RAM_SIZE · 284 unmodified lines
285	285	The default value is 4096 kilobytes. Only change this if you know
286	286	what you are doing.
287	287
	288	+config CDROM_PKTCDVD
	289	+ tristate "Packet writing on CD/DVD media (DEPRECATED)"
	290	+ depends on !UML
	291	+ depends on SCSI
	292	+ select CDROM
	293	+ help
	294	+ Note: This driver is deprecated and will be removed from the
	295	+ kernel in the near future!
	296	+
	297	+ If you have a CDROM/DVD drive that supports packet writing, say
	298	+ Y to include support. It should work with any MMC/Mt Fuji
	299	+ compliant ATAPI or SCSI drive, which is just about any newer
	300	+ DVD/CD writer.
	301	+
	302	+ Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
	303	+ is possible.
	304	+ DVD-RW disks must be in restricted overwrite mode.
	305	+
	306	+ See the file <file:Documentation/cdrom/packet-writing.rst>
	307	+ for further information on the use of this driver.
	308	+
	309	+ To compile this driver as a module, choose M here: the
	310	+ module will be called pktcdvd.
	311	+
	312	+config CDROM_PKTCDVD_BUFFERS
	313	+ int "Free buffers for data gathering"
	314	+ depends on CDROM_PKTCDVD
	315	+ default "8"
	316	+ help
	317	+ This controls the maximum number of active concurrent packets. More
	318	+ concurrent packets can increase write performance, but also require
	319	+ more memory. Each concurrent packet will require approximately 64Kb
	320	+ of non-swappable kernel memory, memory which will be allocated when
	321	+ a disc is opened for writing.
	322	+
	323	+config CDROM_PKTCDVD_WCACHE
	324	+ bool "Enable write caching"
	325	+ depends on CDROM_PKTCDVD
	326	+ help
	327	+ If enabled, write caching will be set for the CD-R/W device. For now
	328	+ this option is dangerous unless the CD-RW media is known good, as we
	329	+ don't do deferred write error handling yet.
	330	+
288	331	config ATA_OVER_ETH
289	332	tristate "ATA over Ethernet support"
290	333	depends on NET

drivers/block/Makefile+1−0

@@ -20,6 +20,7 @@ obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o · 19 unmodified lines
20	20	obj-$(CONFIG_N64CART) += n64cart.o
21	21	obj-$(CONFIG_BLK_DEV_RAM) += brd.o
22	22	obj-$(CONFIG_BLK_DEV_LOOP) += loop.o
	23	+obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
23	24	obj-$(CONFIG_SUNVDC) += sunvdc.o
24	25
25	26	obj-$(CONFIG_BLK_DEV_NBD) += nbd.o

drivers/block/pktcdvd.c+2944−0

@@ -0,0 +1,2944 @@
	1	+/*
	2	+ * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
	3	+ * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
	4	+ * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
	5	+ *
	6	+ * May be copied or modified under the terms of the GNU General Public
	7	+ * License. See linux/COPYING for more information.
	8	+ *
	9	+ * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
	10	+ * DVD-RAM devices.
	11	+ *
	12	+ * Theory of operation:
	13	+ *
	14	+ * At the lowest level, there is the standard driver for the CD/DVD device,
	15	+ * such as drivers/scsi/sr.c. This driver can handle read and write requests,
	16	+ * but it doesn't know anything about the special restrictions that apply to
	17	+ * packet writing. One restriction is that write requests must be aligned to
	18	+ * packet boundaries on the physical media, and the size of a write request
	19	+ * must be equal to the packet size. Another restriction is that a
	20	+ * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
	21	+ * command, if the previous command was a write.
	22	+ *
	23	+ * The purpose of the packet writing driver is to hide these restrictions from
	24	+ * higher layers, such as file systems, and present a block device that can be
	25	+ * randomly read and written using 2kB-sized blocks.
	26	+ *
	27	+ * The lowest layer in the packet writing driver is the packet I/O scheduler.
	28	+ * Its data is defined by the struct packet_iosched and includes two bio
	29	+ * queues with pending read and write requests. These queues are processed
	30	+ * by the pkt_iosched_process_queue() function. The write requests in this
	31	+ * queue are already properly aligned and sized. This layer is responsible for
	32	+ * issuing the flush cache commands and scheduling the I/O in a good order.
	33	+ *
	34	+ * The next layer transforms unaligned write requests to aligned writes. This
	35	+ * transformation requires reading missing pieces of data from the underlying
	36	+ * block device, assembling the pieces to full packets and queuing them to the
	37	+ * packet I/O scheduler.
	38	+ *
	39	+ * At the top layer there is a custom ->submit_bio function that forwards
	40	+ * read requests directly to the iosched queue and puts write requests in the
	41	+ * unaligned write queue. A kernel thread performs the necessary read
	42	+ * gathering to convert the unaligned writes to aligned writes and then feeds
	43	+ * them to the packet I/O scheduler.
	44	+ *
	45	+ *************************************************************************/
	46	+
	47	+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	48	+
	49	+#include <linux/pktcdvd.h>
	50	+#include <linux/module.h>
	51	+#include <linux/types.h>
	52	+#include <linux/kernel.h>
	53	+#include <linux/compat.h>
	54	+#include <linux/kthread.h>
	55	+#include <linux/errno.h>
	56	+#include <linux/spinlock.h>
	57	+#include <linux/file.h>
	58	+#include <linux/proc_fs.h>
	59	+#include <linux/seq_file.h>
	60	+#include <linux/miscdevice.h>
	61	+#include <linux/freezer.h>
	62	+#include <linux/mutex.h>
	63	+#include <linux/slab.h>
	64	+#include <linux/backing-dev.h>
	65	+#include <scsi/scsi_cmnd.h>
	66	+#include <scsi/scsi_ioctl.h>
	67	+#include <scsi/scsi.h>
	68	+#include <linux/debugfs.h>
	69	+#include <linux/device.h>
	70	+#include <linux/nospec.h>
	71	+#include <linux/uaccess.h>
	72	+
	73	+#define DRIVER_NAME "pktcdvd"
	74	+
	75	+#define pkt_err(pd, fmt, ...) \
	76	+ pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
	77	+#define pkt_notice(pd, fmt, ...) \
	78	+ pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
	79	+#define pkt_info(pd, fmt, ...) \
	80	+ pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
	81	+
	82	+#define pkt_dbg(level, pd, fmt, ...) \
	83	+do { \
	84	+ if (level == 2 && PACKET_DEBUG >= 2) \
	85	+ pr_notice("%s: %s():" fmt, \
	86	+ pd->name, __func__, ##__VA_ARGS__); \
	87	+ else if (level == 1 && PACKET_DEBUG >= 1) \
	88	+ pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \
	89	+} while (0)
	90	+
	91	+#define MAX_SPEED 0xffff
	92	+
	93	+static DEFINE_MUTEX(pktcdvd_mutex);
	94	+static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
	95	+static struct proc_dir_entry *pkt_proc;
	96	+static int pktdev_major;
	97	+static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
	98	+static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
	99	+static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
	100	+static mempool_t psd_pool;
	101	+static struct bio_set pkt_bio_set;
	102	+
	103	+static struct class class_pktcdvd = NULL; / /sys/class/pktcdvd */
	104	+static struct dentry pkt_debugfs_root = NULL; / /sys/kernel/debug/pktcdvd */
	105	+
	106	+/* forward declaration */
	107	+static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
	108	+static int pkt_remove_dev(dev_t pkt_dev);
	109	+static int pkt_seq_show(struct seq_file m, void p);
	110	+
	111	+static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
	112	+{
	113	+ return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
	114	+}
	115	+
	116	+/**********************************************************
	117	+ * sysfs interface for pktcdvd
	118	+ * by (C) 2006 Thomas Maier <balagi@justmail.de>
	119	+
	120	+ /sys/class/pktcdvd/pktcdvd[0-7]/
	121	+ stat/reset
	122	+ stat/packets_started
	123	+ stat/packets_finished
	124	+ stat/kb_written
	125	+ stat/kb_read
	126	+ stat/kb_read_gather
	127	+ write_queue/size
	128	+ write_queue/congestion_off
	129	+ write_queue/congestion_on
	130	+ **********************************************************/
	131	+
	132	+static ssize_t packets_started_show(struct device *dev,
	133	+ struct device_attribute attr, char buf)
	134	+{
	135	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	136	+
	137	+ return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started);
	138	+}
	139	+static DEVICE_ATTR_RO(packets_started);
	140	+
	141	+static ssize_t packets_finished_show(struct device *dev,
	142	+ struct device_attribute attr, char buf)
	143	+{
	144	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	145	+
	146	+ return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended);
	147	+}
	148	+static DEVICE_ATTR_RO(packets_finished);
	149	+
	150	+static ssize_t kb_written_show(struct device *dev,
	151	+ struct device_attribute attr, char buf)
	152	+{
	153	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	154	+
	155	+ return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1);
	156	+}
	157	+static DEVICE_ATTR_RO(kb_written);
	158	+
	159	+static ssize_t kb_read_show(struct device *dev,
	160	+ struct device_attribute attr, char buf)
	161	+{
	162	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	163	+
	164	+ return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1);
	165	+}
	166	+static DEVICE_ATTR_RO(kb_read);
	167	+
	168	+static ssize_t kb_read_gather_show(struct device *dev,
	169	+ struct device_attribute attr, char buf)
	170	+{
	171	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	172	+
	173	+ return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1);
	174	+}
	175	+static DEVICE_ATTR_RO(kb_read_gather);
	176	+
	177	+static ssize_t reset_store(struct device dev, struct device_attribute attr,
	178	+ const char *buf, size_t len)
	179	+{
	180	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	181	+
	182	+ if (len > 0) {
	183	+ pd->stats.pkt_started = 0;
	184	+ pd->stats.pkt_ended = 0;
	185	+ pd->stats.secs_w = 0;
	186	+ pd->stats.secs_rg = 0;
	187	+ pd->stats.secs_r = 0;
	188	+ }
	189	+ return len;
	190	+}
	191	+static DEVICE_ATTR_WO(reset);
	192	+
	193	+static struct attribute *pkt_stat_attrs[] = {
	194	+ &dev_attr_packets_finished.attr,
	195	+ &dev_attr_packets_started.attr,
	196	+ &dev_attr_kb_read.attr,
	197	+ &dev_attr_kb_written.attr,
	198	+ &dev_attr_kb_read_gather.attr,
	199	+ &dev_attr_reset.attr,
	200	+ NULL,
	201	+};
	202	+
	203	+static const struct attribute_group pkt_stat_group = {
	204	+ .name = "stat",
	205	+ .attrs = pkt_stat_attrs,
	206	+};
	207	+
	208	+static ssize_t size_show(struct device *dev,
	209	+ struct device_attribute attr, char buf)
	210	+{
	211	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	212	+ int n;
	213	+
	214	+ spin_lock(&pd->lock);
	215	+ n = sysfs_emit(buf, "%d\n", pd->bio_queue_size);
	216	+ spin_unlock(&pd->lock);
	217	+ return n;
	218	+}
	219	+static DEVICE_ATTR_RO(size);
	220	+
	221	+static void init_write_congestion_marks(int* lo, int* hi)
	222	+{
	223	+ if (*hi > 0) {
	224	+ hi = max(hi, 500);
	225	+ hi = min(hi, 1000000);
	226	+ if (*lo <= 0)
	227	+ lo = hi - 100;
	228	+ else {
	229	+ lo = min(lo, *hi - 100);
	230	+ lo = max(lo, 100);
	231	+ }
	232	+ } else {
	233	+ *hi = -1;
	234	+ *lo = -1;
	235	+ }
	236	+}
	237	+
	238	+static ssize_t congestion_off_show(struct device *dev,
	239	+ struct device_attribute attr, char buf)
	240	+{
	241	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	242	+ int n;
	243	+
	244	+ spin_lock(&pd->lock);
	245	+ n = sysfs_emit(buf, "%d\n", pd->write_congestion_off);
	246	+ spin_unlock(&pd->lock);
	247	+ return n;
	248	+}
	249	+
	250	+static ssize_t congestion_off_store(struct device *dev,
	251	+ struct device_attribute *attr,
	252	+ const char *buf, size_t len)
	253	+{
	254	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	255	+ int val;
	256	+
	257	+ if (sscanf(buf, "%d", &val) == 1) {
	258	+ spin_lock(&pd->lock);
	259	+ pd->write_congestion_off = val;
	260	+ init_write_congestion_marks(&pd->write_congestion_off,
	261	+ &pd->write_congestion_on);
	262	+ spin_unlock(&pd->lock);
	263	+ }
	264	+ return len;
	265	+}
	266	+static DEVICE_ATTR_RW(congestion_off);
	267	+
	268	+static ssize_t congestion_on_show(struct device *dev,
	269	+ struct device_attribute attr, char buf)
	270	+{
	271	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	272	+ int n;
	273	+
	274	+ spin_lock(&pd->lock);
	275	+ n = sysfs_emit(buf, "%d\n", pd->write_congestion_on);
	276	+ spin_unlock(&pd->lock);
	277	+ return n;
	278	+}
	279	+
	280	+static ssize_t congestion_on_store(struct device *dev,
	281	+ struct device_attribute *attr,
	282	+ const char *buf, size_t len)
	283	+{
	284	+ struct pktcdvd_device *pd = dev_get_drvdata(dev);
	285	+ int val;
	286	+
	287	+ if (sscanf(buf, "%d", &val) == 1) {
	288	+ spin_lock(&pd->lock);
	289	+ pd->write_congestion_on = val;
	290	+ init_write_congestion_marks(&pd->write_congestion_off,
	291	+ &pd->write_congestion_on);
	292	+ spin_unlock(&pd->lock);
	293	+ }
	294	+ return len;
	295	+}
	296	+static DEVICE_ATTR_RW(congestion_on);
	297	+
	298	+static struct attribute *pkt_wq_attrs[] = {
	299	+ &dev_attr_congestion_on.attr,
	300	+ &dev_attr_congestion_off.attr,
	301	+ &dev_attr_size.attr,
	302	+ NULL,
	303	+};
	304	+
	305	+static const struct attribute_group pkt_wq_group = {
	306	+ .name = "write_queue",
	307	+ .attrs = pkt_wq_attrs,
	308	+};
	309	+
	310	+static const struct attribute_group *pkt_groups[] = {
	311	+ &pkt_stat_group,
	312	+ &pkt_wq_group,
	313	+ NULL,
	314	+};
	315	+
	316	+static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
	317	+{
	318	+ if (class_pktcdvd) {
	319	+ pd->dev = device_create_with_groups(class_pktcdvd, NULL,
	320	+ MKDEV(0, 0), pd, pkt_groups,
	321	+ "%s", pd->name);
	322	+ if (IS_ERR(pd->dev))
	323	+ pd->dev = NULL;
	324	+ }
	325	+}
	326	+
	327	+static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
	328	+{
	329	+ if (class_pktcdvd)
	330	+ device_unregister(pd->dev);
	331	+}
	332	+
	333	+
	334	+/********************************************************************
	335	+ /sys/class/pktcdvd/
	336	+ add map block device
	337	+ remove unmap packet dev
	338	+ device_map show mappings
	339	+ *******************************************************************/
	340	+
	341	+static void class_pktcdvd_release(struct class *cls)
	342	+{
	343	+ kfree(cls);
	344	+}
	345	+
	346	+static ssize_t device_map_show(struct class c, struct class_attribute attr,
	347	+ char *data)
	348	+{
	349	+ int n = 0;
	350	+ int idx;
	351	+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	352	+ for (idx = 0; idx < MAX_WRITERS; idx++) {
	353	+ struct pktcdvd_device *pd = pkt_devs[idx];
	354	+ if (!pd)
	355	+ continue;
	356	+ n += sprintf(data+n, "%s %u:%u %u:%u\n",
	357	+ pd->name,
	358	+ MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
	359	+ MAJOR(pd->bdev->bd_dev),
	360	+ MINOR(pd->bdev->bd_dev));
	361	+ }
	362	+ mutex_unlock(&ctl_mutex);
	363	+ return n;
	364	+}
	365	+static CLASS_ATTR_RO(device_map);
	366	+
	367	+static ssize_t add_store(struct class c, struct class_attribute attr,
	368	+ const char *buf, size_t count)
	369	+{
	370	+ unsigned int major, minor;
	371	+
	372	+ if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
	373	+ /* pkt_setup_dev() expects caller to hold reference to self */
	374	+ if (!try_module_get(THIS_MODULE))
	375	+ return -ENODEV;
	376	+
	377	+ pkt_setup_dev(MKDEV(major, minor), NULL);
	378	+
	379	+ module_put(THIS_MODULE);
	380	+
	381	+ return count;
	382	+ }
	383	+
	384	+ return -EINVAL;
	385	+}
	386	+static CLASS_ATTR_WO(add);
	387	+
	388	+static ssize_t remove_store(struct class c, struct class_attribute attr,
	389	+ const char *buf, size_t count)
	390	+{
	391	+ unsigned int major, minor;
	392	+ if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
	393	+ pkt_remove_dev(MKDEV(major, minor));
	394	+ return count;
	395	+ }
	396	+ return -EINVAL;
	397	+}
	398	+static CLASS_ATTR_WO(remove);
	399	+
	400	+static struct attribute *class_pktcdvd_attrs[] = {
	401	+ &class_attr_add.attr,
	402	+ &class_attr_remove.attr,
	403	+ &class_attr_device_map.attr,
	404	+ NULL,
	405	+};
	406	+ATTRIBUTE_GROUPS(class_pktcdvd);
	407	+
	408	+static int pkt_sysfs_init(void)
	409	+{
	410	+ int ret = 0;
	411	+
	412	+ /*
	413	+ * create control files in sysfs
	414	+ * /sys/class/pktcdvd/...
	415	+ */
	416	+ class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
	417	+ if (!class_pktcdvd)
	418	+ return -ENOMEM;
	419	+ class_pktcdvd->name = DRIVER_NAME;
	420	+ class_pktcdvd->owner = THIS_MODULE;
	421	+ class_pktcdvd->class_release = class_pktcdvd_release;
	422	+ class_pktcdvd->class_groups = class_pktcdvd_groups;
	423	+ ret = class_register(class_pktcdvd);
	424	+ if (ret) {
	425	+ kfree(class_pktcdvd);
	426	+ class_pktcdvd = NULL;
	427	+ pr_err("failed to create class pktcdvd\n");
	428	+ return ret;
	429	+ }
	430	+ return 0;
	431	+}
	432	+
	433	+static void pkt_sysfs_cleanup(void)
	434	+{
	435	+ if (class_pktcdvd)
	436	+ class_destroy(class_pktcdvd);
	437	+ class_pktcdvd = NULL;
	438	+}
	439	+
	440	+/********************************************************************
	441	+ entries in debugfs
	442	+
	443	+ /sys/kernel/debug/pktcdvd[0-7]/
	444	+ info
	445	+
	446	+ *******************************************************************/
	447	+
	448	+static int pkt_debugfs_seq_show(struct seq_file m, void p)
	449	+{
	450	+ return pkt_seq_show(m, p);
	451	+}
	452	+
	453	+static int pkt_debugfs_fops_open(struct inode inode, struct file file)
	454	+{
	455	+ return single_open(file, pkt_debugfs_seq_show, inode->i_private);
	456	+}
	457	+
	458	+static const struct file_operations debug_fops = {
	459	+ .open = pkt_debugfs_fops_open,
	460	+ .read = seq_read,
	461	+ .llseek = seq_lseek,
	462	+ .release = single_release,
	463	+ .owner = THIS_MODULE,
	464	+};
	465	+
	466	+static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
	467	+{
	468	+ if (!pkt_debugfs_root)
	469	+ return;
	470	+ pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
	471	+ if (!pd->dfs_d_root)
	472	+ return;
	473	+
	474	+ pd->dfs_f_info = debugfs_create_file("info", 0444,
	475	+ pd->dfs_d_root, pd, &debug_fops);
	476	+}
	477	+
	478	+static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
	479	+{
	480	+ if (!pkt_debugfs_root)
	481	+ return;
	482	+ debugfs_remove(pd->dfs_f_info);
	483	+ debugfs_remove(pd->dfs_d_root);
	484	+ pd->dfs_f_info = NULL;
	485	+ pd->dfs_d_root = NULL;
	486	+}
	487	+
	488	+static void pkt_debugfs_init(void)
	489	+{
	490	+ pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
	491	+}
	492	+
	493	+static void pkt_debugfs_cleanup(void)
	494	+{
	495	+ debugfs_remove(pkt_debugfs_root);
	496	+ pkt_debugfs_root = NULL;
	497	+}
	498	+
	499	+/* ----------------------------------------------------------*/
	500	+
	501	+
	502	+static void pkt_bio_finished(struct pktcdvd_device *pd)
	503	+{
	504	+ BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
	505	+ if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
	506	+ pkt_dbg(2, pd, "queue empty\n");
	507	+ atomic_set(&pd->iosched.attention, 1);
	508	+ wake_up(&pd->wqueue);
	509	+ }
	510	+}
	511	+
	512	+/*
	513	+ * Allocate a packet_data struct
	514	+ */
	515	+static struct packet_data *pkt_alloc_packet_data(int frames)
	516	+{
	517	+ int i;
	518	+ struct packet_data *pkt;
	519	+
	520	+ pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
	521	+ if (!pkt)
	522	+ goto no_pkt;
	523	+
	524	+ pkt->frames = frames;
	525	+ pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL);
	526	+ if (!pkt->w_bio)
	527	+ goto no_bio;
	528	+
	529	+ for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
	530	+ pkt->pages[i] = alloc_page(GFP_KERNEL\|__GFP_ZERO);
	531	+ if (!pkt->pages[i])
	532	+ goto no_page;
	533	+ }
	534	+
	535	+ spin_lock_init(&pkt->lock);
	536	+ bio_list_init(&pkt->orig_bios);
	537	+
	538	+ for (i = 0; i < frames; i++) {
	539	+ pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL);
	540	+ if (!pkt->r_bios[i])
	541	+ goto no_rd_bio;
	542	+ }
	543	+
	544	+ return pkt;
	545	+
	546	+no_rd_bio:
	547	+ for (i = 0; i < frames; i++)
	548	+ kfree(pkt->r_bios[i]);
	549	+no_page:
	550	+ for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
	551	+ if (pkt->pages[i])
	552	+ __free_page(pkt->pages[i]);
	553	+ kfree(pkt->w_bio);
	554	+no_bio:
	555	+ kfree(pkt);
	556	+no_pkt:
	557	+ return NULL;
	558	+}
	559	+
	560	+/*
	561	+ * Free a packet_data struct
	562	+ */
	563	+static void pkt_free_packet_data(struct packet_data *pkt)
	564	+{
	565	+ int i;
	566	+
	567	+ for (i = 0; i < pkt->frames; i++)
	568	+ kfree(pkt->r_bios[i]);
	569	+ for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
	570	+ __free_page(pkt->pages[i]);
	571	+ kfree(pkt->w_bio);
	572	+ kfree(pkt);
	573	+}
	574	+
	575	+static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
	576	+{
	577	+ struct packet_data pkt, next;
	578	+
	579	+ BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
	580	+
	581	+ list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
	582	+ pkt_free_packet_data(pkt);
	583	+ }
	584	+ INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
	585	+}
	586	+
	587	+static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
	588	+{
	589	+ struct packet_data *pkt;
	590	+
	591	+ BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
	592	+
	593	+ while (nr_packets > 0) {
	594	+ pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
	595	+ if (!pkt) {
	596	+ pkt_shrink_pktlist(pd);
	597	+ return 0;
	598	+ }
	599	+ pkt->id = nr_packets;
	600	+ pkt->pd = pd;
	601	+ list_add(&pkt->list, &pd->cdrw.pkt_free_list);
	602	+ nr_packets--;
	603	+ }
	604	+ return 1;
	605	+}
	606	+
	607	+static inline struct pkt_rb_node pkt_rbtree_next(struct pkt_rb_node node)
	608	+{
	609	+ struct rb_node *n = rb_next(&node->rb_node);
	610	+ if (!n)
	611	+ return NULL;
	612	+ return rb_entry(n, struct pkt_rb_node, rb_node);
	613	+}
	614	+
	615	+static void pkt_rbtree_erase(struct pktcdvd_device pd, struct pkt_rb_node node)
	616	+{
	617	+ rb_erase(&node->rb_node, &pd->bio_queue);
	618	+ mempool_free(node, &pd->rb_pool);
	619	+ pd->bio_queue_size--;
	620	+ BUG_ON(pd->bio_queue_size < 0);
	621	+}
	622	+
	623	+/*
	624	+ * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
	625	+ */
	626	+static struct pkt_rb_node pkt_rbtree_find(struct pktcdvd_device pd, sector_t s)
	627	+{
	628	+ struct rb_node *n = pd->bio_queue.rb_node;
	629	+ struct rb_node *next;
	630	+ struct pkt_rb_node *tmp;
	631	+
	632	+ if (!n) {
	633	+ BUG_ON(pd->bio_queue_size > 0);
	634	+ return NULL;
	635	+ }
	636	+
	637	+ for (;;) {
	638	+ tmp = rb_entry(n, struct pkt_rb_node, rb_node);
	639	+ if (s <= tmp->bio->bi_iter.bi_sector)
	640	+ next = n->rb_left;
	641	+ else
	642	+ next = n->rb_right;
	643	+ if (!next)
	644	+ break;
	645	+ n = next;
	646	+ }
	647	+
	648	+ if (s > tmp->bio->bi_iter.bi_sector) {
	649	+ tmp = pkt_rbtree_next(tmp);
	650	+ if (!tmp)
	651	+ return NULL;
	652	+ }
	653	+ BUG_ON(s > tmp->bio->bi_iter.bi_sector);
	654	+ return tmp;
	655	+}
	656	+
	657	+/*
	658	+ * Insert a node into the pd->bio_queue rb tree.
	659	+ */
	660	+static void pkt_rbtree_insert(struct pktcdvd_device pd, struct pkt_rb_node node)
	661	+{
	662	+ struct rb_node **p = &pd->bio_queue.rb_node;
	663	+ struct rb_node *parent = NULL;
	664	+ sector_t s = node->bio->bi_iter.bi_sector;
	665	+ struct pkt_rb_node *tmp;
	666	+
	667	+ while (*p) {
	668	+ parent = *p;
	669	+ tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
	670	+ if (s < tmp->bio->bi_iter.bi_sector)
	671	+ p = &(*p)->rb_left;
	672	+ else
	673	+ p = &(*p)->rb_right;
	674	+ }
	675	+ rb_link_node(&node->rb_node, parent, p);
	676	+ rb_insert_color(&node->rb_node, &pd->bio_queue);
	677	+ pd->bio_queue_size++;
	678	+}
	679	+
	680	+/*
	681	+ * Send a packet_command to the underlying block device and
	682	+ * wait for completion.
	683	+ */
	684	+static int pkt_generic_packet(struct pktcdvd_device pd, struct packet_command cgc)
	685	+{
	686	+ struct request_queue *q = bdev_get_queue(pd->bdev);
	687	+ struct scsi_cmnd *scmd;
	688	+ struct request *rq;
	689	+ int ret = 0;
	690	+
	691	+ rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
	692	+ REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
	693	+ if (IS_ERR(rq))
	694	+ return PTR_ERR(rq);
	695	+ scmd = blk_mq_rq_to_pdu(rq);
	696	+
	697	+ if (cgc->buflen) {
	698	+ ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
	699	+ GFP_NOIO);
	700	+ if (ret)
	701	+ goto out;
	702	+ }
	703	+
	704	+ scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
	705	+ memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE);
	706	+
	707	+ rq->timeout = 60*HZ;
	708	+ if (cgc->quiet)
	709	+ rq->rq_flags \|= RQF_QUIET;
	710	+
	711	+ blk_execute_rq(rq, false);
	712	+ if (scmd->result)
	713	+ ret = -EIO;
	714	+out:
	715	+ blk_mq_free_request(rq);
	716	+ return ret;
	717	+}
	718	+
	719	+static const char *sense_key_string(__u8 index)
	720	+{
	721	+ static const char * const info[] = {
	722	+ "No sense", "Recovered error", "Not ready",
	723	+ "Medium error", "Hardware error", "Illegal request",
	724	+ "Unit attention", "Data protect", "Blank check",
	725	+ };
	726	+
	727	+ return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
	728	+}
	729	+
	730	+/*
	731	+ * A generic sense dump / resolve mechanism should be implemented across
	732	+ * all ATAPI + SCSI devices.
	733	+ */
	734	+static void pkt_dump_sense(struct pktcdvd_device *pd,
	735	+ struct packet_command *cgc)
	736	+{
	737	+ struct scsi_sense_hdr *sshdr = cgc->sshdr;
	738	+
	739	+ if (sshdr)
	740	+ pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
	741	+ CDROM_PACKET_SIZE, cgc->cmd,
	742	+ sshdr->sense_key, sshdr->asc, sshdr->ascq,
	743	+ sense_key_string(sshdr->sense_key));
	744	+ else
	745	+ pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
	746	+}
	747	+
	748	+/*
	749	+ * flush the drive cache to media
	750	+ */
	751	+static int pkt_flush_cache(struct pktcdvd_device *pd)
	752	+{
	753	+ struct packet_command cgc;
	754	+
	755	+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	756	+ cgc.cmd[0] = GPCMD_FLUSH_CACHE;
	757	+ cgc.quiet = 1;
	758	+
	759	+ /*
	760	+ * the IMMED bit -- we default to not setting it, although that
	761	+ * would allow a much faster close, this is safer
	762	+ */
	763	+#if 0
	764	+ cgc.cmd[1] = 1 << 1;
	765	+#endif
	766	+ return pkt_generic_packet(pd, &cgc);
	767	+}
	768	+
	769	+/*
	770	+ * speed is given as the normal factor, e.g. 4 for 4x
	771	+ */
	772	+static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
	773	+ unsigned write_speed, unsigned read_speed)
	774	+{
	775	+ struct packet_command cgc;
	776	+ struct scsi_sense_hdr sshdr;
	777	+ int ret;
	778	+
	779	+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	780	+ cgc.sshdr = &sshdr;
	781	+ cgc.cmd[0] = GPCMD_SET_SPEED;
	782	+ cgc.cmd[2] = (read_speed >> 8) & 0xff;
	783	+ cgc.cmd[3] = read_speed & 0xff;
	784	+ cgc.cmd[4] = (write_speed >> 8) & 0xff;
	785	+ cgc.cmd[5] = write_speed & 0xff;
	786	+
	787	+ ret = pkt_generic_packet(pd, &cgc);
	788	+ if (ret)
	789	+ pkt_dump_sense(pd, &cgc);
	790	+
	791	+ return ret;
	792	+}
	793	+
	794	+/*
	795	+ * Queue a bio for processing by the low-level CD device. Must be called
	796	+ * from process context.
	797	+ */
	798	+static void pkt_queue_bio(struct pktcdvd_device pd, struct bio bio)
	799	+{
	800	+ spin_lock(&pd->iosched.lock);
	801	+ if (bio_data_dir(bio) == READ)
	802	+ bio_list_add(&pd->iosched.read_queue, bio);
	803	+ else
	804	+ bio_list_add(&pd->iosched.write_queue, bio);
	805	+ spin_unlock(&pd->iosched.lock);
	806	+
	807	+ atomic_set(&pd->iosched.attention, 1);
	808	+ wake_up(&pd->wqueue);
	809	+}
	810	+
	811	+/*
	812	+ * Process the queued read/write requests. This function handles special
	813	+ * requirements for CDRW drives:
	814	+ * - A cache flush command must be inserted before a read request if the
	815	+ * previous request was a write.
	816	+ * - Switching between reading and writing is slow, so don't do it more often
	817	+ * than necessary.
	818	+ * - Optimize for throughput at the expense of latency. This means that streaming
	819	+ * writes will never be interrupted by a read, but if the drive has to seek
	820	+ * before the next write, switch to reading instead if there are any pending
	821	+ * read requests.
	822	+ * - Set the read speed according to current usage pattern. When only reading
	823	+ * from the device, it's best to use the highest possible read speed, but
	824	+ * when switching often between reading and writing, it's better to have the
	825	+ * same read and write speeds.
	826	+ */
	827	+static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
	828	+{
	829	+
	830	+ if (atomic_read(&pd->iosched.attention) == 0)
	831	+ return;
	832	+ atomic_set(&pd->iosched.attention, 0);
	833	+
	834	+ for (;;) {
	835	+ struct bio *bio;
	836	+ int reads_queued, writes_queued;
	837	+
	838	+ spin_lock(&pd->iosched.lock);
	839	+ reads_queued = !bio_list_empty(&pd->iosched.read_queue);
	840	+ writes_queued = !bio_list_empty(&pd->iosched.write_queue);
	841	+ spin_unlock(&pd->iosched.lock);
	842	+
	843	+ if (!reads_queued && !writes_queued)
	844	+ break;
	845	+
	846	+ if (pd->iosched.writing) {
	847	+ int need_write_seek = 1;
	848	+ spin_lock(&pd->iosched.lock);
	849	+ bio = bio_list_peek(&pd->iosched.write_queue);
	850	+ spin_unlock(&pd->iosched.lock);
	851	+ if (bio && (bio->bi_iter.bi_sector ==
	852	+ pd->iosched.last_write))
	853	+ need_write_seek = 0;
	854	+ if (need_write_seek && reads_queued) {
	855	+ if (atomic_read(&pd->cdrw.pending_bios) > 0) {
	856	+ pkt_dbg(2, pd, "write, waiting\n");
	857	+ break;
	858	+ }
	859	+ pkt_flush_cache(pd);
	860	+ pd->iosched.writing = 0;
	861	+ }
	862	+ } else {
	863	+ if (!reads_queued && writes_queued) {
	864	+ if (atomic_read(&pd->cdrw.pending_bios) > 0) {
	865	+ pkt_dbg(2, pd, "read, waiting\n");
	866	+ break;
	867	+ }
	868	+ pd->iosched.writing = 1;
	869	+ }
	870	+ }
	871	+
	872	+ spin_lock(&pd->iosched.lock);
	873	+ if (pd->iosched.writing)
	874	+ bio = bio_list_pop(&pd->iosched.write_queue);
	875	+ else
	876	+ bio = bio_list_pop(&pd->iosched.read_queue);
	877	+ spin_unlock(&pd->iosched.lock);
	878	+
	879	+ if (!bio)
	880	+ continue;
	881	+
	882	+ if (bio_data_dir(bio) == READ)
	883	+ pd->iosched.successive_reads +=
	884	+ bio->bi_iter.bi_size >> 10;
	885	+ else {
	886	+ pd->iosched.successive_reads = 0;
	887	+ pd->iosched.last_write = bio_end_sector(bio);
	888	+ }
	889	+ if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
	890	+ if (pd->read_speed == pd->write_speed) {
	891	+ pd->read_speed = MAX_SPEED;
	892	+ pkt_set_speed(pd, pd->write_speed, pd->read_speed);
	893	+ }
	894	+ } else {
	895	+ if (pd->read_speed != pd->write_speed) {
	896	+ pd->read_speed = pd->write_speed;
	897	+ pkt_set_speed(pd, pd->write_speed, pd->read_speed);
	898	+ }
	899	+ }
	900	+
	901	+ atomic_inc(&pd->cdrw.pending_bios);
	902	+ submit_bio_noacct(bio);
	903	+ }
	904	+}
	905	+
	906	+/*
	907	+ * Special care is needed if the underlying block device has a small
	908	+ * max_phys_segments value.
	909	+ */
	910	+static int pkt_set_segment_merging(struct pktcdvd_device pd, struct request_queue q)
	911	+{
	912	+ if ((pd->settings.size << 9) / CD_FRAMESIZE
	913	+ <= queue_max_segments(q)) {
	914	+ /*
	915	+ * The cdrom device can handle one segment/frame
	916	+ */
	917	+ clear_bit(PACKET_MERGE_SEGS, &pd->flags);
	918	+ return 0;
	919	+ } else if ((pd->settings.size << 9) / PAGE_SIZE
	920	+ <= queue_max_segments(q)) {
	921	+ /*
	922	+ * We can handle this case at the expense of some extra memory
	923	+ * copies during write operations
	924	+ */
	925	+ set_bit(PACKET_MERGE_SEGS, &pd->flags);
	926	+ return 0;
	927	+ } else {
	928	+ pkt_err(pd, "cdrom max_phys_segments too small\n");
	929	+ return -EIO;
	930	+ }
	931	+}
	932	+
	933	+static void pkt_end_io_read(struct bio *bio)
	934	+{
	935	+ struct packet_data *pkt = bio->bi_private;
	936	+ struct pktcdvd_device *pd = pkt->pd;
	937	+ BUG_ON(!pd);
	938	+
	939	+ pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
	940	+ bio, (unsigned long long)pkt->sector,
	941	+ (unsigned long long)bio->bi_iter.bi_sector, bio->bi_status);
	942	+
	943	+ if (bio->bi_status)
	944	+ atomic_inc(&pkt->io_errors);
	945	+ bio_uninit(bio);
	946	+ if (atomic_dec_and_test(&pkt->io_wait)) {
	947	+ atomic_inc(&pkt->run_sm);
	948	+ wake_up(&pd->wqueue);
	949	+ }
	950	+ pkt_bio_finished(pd);
	951	+}
	952	+
	953	+static void pkt_end_io_packet_write(struct bio *bio)
	954	+{
	955	+ struct packet_data *pkt = bio->bi_private;
	956	+ struct pktcdvd_device *pd = pkt->pd;
	957	+ BUG_ON(!pd);
	958	+
	959	+ pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status);
	960	+
	961	+ pd->stats.pkt_ended++;
	962	+
	963	+ bio_uninit(bio);
	964	+ pkt_bio_finished(pd);
	965	+ atomic_dec(&pkt->io_wait);
	966	+ atomic_inc(&pkt->run_sm);
	967	+ wake_up(&pd->wqueue);
	968	+}
	969	+
	970	+/*
	971	+ * Schedule reads for the holes in a packet
	972	+ */
	973	+static void pkt_gather_data(struct pktcdvd_device pd, struct packet_data pkt)
	974	+{
	975	+ int frames_read = 0;
	976	+ struct bio *bio;
	977	+ int f;
	978	+ char written[PACKET_MAX_SIZE];
	979	+
	980	+ BUG_ON(bio_list_empty(&pkt->orig_bios));
	981	+
	982	+ atomic_set(&pkt->io_wait, 0);
	983	+ atomic_set(&pkt->io_errors, 0);
	984	+
	985	+ /*
	986	+ * Figure out which frames we need to read before we can write.
	987	+ */
	988	+ memset(written, 0, sizeof(written));
	989	+ spin_lock(&pkt->lock);
	990	+ bio_list_for_each(bio, &pkt->orig_bios) {
	991	+ int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
	992	+ (CD_FRAMESIZE >> 9);
	993	+ int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
	994	+ pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
	995	+ BUG_ON(first_frame < 0);
	996	+ BUG_ON(first_frame + num_frames > pkt->frames);
	997	+ for (f = first_frame; f < first_frame + num_frames; f++)
	998	+ written[f] = 1;
	999	+ }
	1000	+ spin_unlock(&pkt->lock);
	1001	+
	1002	+ if (pkt->cache_valid) {
	1003	+ pkt_dbg(2, pd, "zone %llx cached\n",
	1004	+ (unsigned long long)pkt->sector);
	1005	+ goto out_account;
	1006	+ }
	1007	+
	1008	+ /*
	1009	+ * Schedule reads for missing parts of the packet.
	1010	+ */
	1011	+ for (f = 0; f < pkt->frames; f++) {
	1012	+ int p, offset;
	1013	+
	1014	+ if (written[f])
	1015	+ continue;
	1016	+
	1017	+ bio = pkt->r_bios[f];
	1018	+ bio_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ);
	1019	+ bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
	1020	+ bio->bi_end_io = pkt_end_io_read;
	1021	+ bio->bi_private = pkt;
	1022	+
	1023	+ p = (f * CD_FRAMESIZE) / PAGE_SIZE;
	1024	+ offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
	1025	+ pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
	1026	+ f, pkt->pages[p], offset);
	1027	+ if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
	1028	+ BUG();
	1029	+
	1030	+ atomic_inc(&pkt->io_wait);
	1031	+ pkt_queue_bio(pd, bio);
	1032	+ frames_read++;
	1033	+ }
	1034	+
	1035	+out_account:
	1036	+ pkt_dbg(2, pd, "need %d frames for zone %llx\n",
	1037	+ frames_read, (unsigned long long)pkt->sector);
	1038	+ pd->stats.pkt_started++;
	1039	+ pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
	1040	+}
	1041	+
	1042	+/*
	1043	+ * Find a packet matching zone, or the least recently used packet if
	1044	+ * there is no match.
	1045	+ */
	1046	+static struct packet_data pkt_get_packet_data(struct pktcdvd_device pd, int zone)
	1047	+{
	1048	+ struct packet_data *pkt;
	1049	+
	1050	+ list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
	1051	+ if (pkt->sector == zone \|\| pkt->list.next == &pd->cdrw.pkt_free_list) {
	1052	+ list_del_init(&pkt->list);
	1053	+ if (pkt->sector != zone)
	1054	+ pkt->cache_valid = 0;
	1055	+ return pkt;
	1056	+ }
	1057	+ }
	1058	+ BUG();
	1059	+ return NULL;
	1060	+}
	1061	+
	1062	+static void pkt_put_packet_data(struct pktcdvd_device pd, struct packet_data pkt)
	1063	+{
	1064	+ if (pkt->cache_valid) {
	1065	+ list_add(&pkt->list, &pd->cdrw.pkt_free_list);
	1066	+ } else {
	1067	+ list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
	1068	+ }
	1069	+}
	1070	+
	1071	+static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
	1072	+{
	1073	+#if PACKET_DEBUG > 1
	1074	+ static const char *state_name[] = {
	1075	+ "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
	1076	+ };
	1077	+ enum packet_data_state old_state = pkt->state;
	1078	+ pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
	1079	+ pkt->id, (unsigned long long)pkt->sector,
	1080	+ state_name[old_state], state_name[state]);
	1081	+#endif
	1082	+ pkt->state = state;
	1083	+}
	1084	+
	1085	+/*
	1086	+ * Scan the work queue to see if we can start a new packet.
	1087	+ * returns non-zero if any work was done.
	1088	+ */
	1089	+static int pkt_handle_queue(struct pktcdvd_device *pd)
	1090	+{
	1091	+ struct packet_data pkt, p;
	1092	+ struct bio *bio = NULL;
	1093	+ sector_t zone = 0; /* Suppress gcc warning */
	1094	+ struct pkt_rb_node node, first_node;
	1095	+ struct rb_node *n;
	1096	+
	1097	+ atomic_set(&pd->scan_queue, 0);
	1098	+
	1099	+ if (list_empty(&pd->cdrw.pkt_free_list)) {
	1100	+ pkt_dbg(2, pd, "no pkt\n");
	1101	+ return 0;
	1102	+ }
	1103	+
	1104	+ /*
	1105	+ * Try to find a zone we are not already working on.
	1106	+ */
	1107	+ spin_lock(&pd->lock);
	1108	+ first_node = pkt_rbtree_find(pd, pd->current_sector);
	1109	+ if (!first_node) {
	1110	+ n = rb_first(&pd->bio_queue);
	1111	+ if (n)
	1112	+ first_node = rb_entry(n, struct pkt_rb_node, rb_node);
	1113	+ }
	1114	+ node = first_node;
	1115	+ while (node) {
	1116	+ bio = node->bio;
	1117	+ zone = get_zone(bio->bi_iter.bi_sector, pd);
	1118	+ list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
	1119	+ if (p->sector == zone) {
	1120	+ bio = NULL;
	1121	+ goto try_next_bio;
	1122	+ }
	1123	+ }
	1124	+ break;
	1125	+try_next_bio:
	1126	+ node = pkt_rbtree_next(node);
	1127	+ if (!node) {
	1128	+ n = rb_first(&pd->bio_queue);
	1129	+ if (n)
	1130	+ node = rb_entry(n, struct pkt_rb_node, rb_node);
	1131	+ }
	1132	+ if (node == first_node)
	1133	+ node = NULL;
	1134	+ }
	1135	+ spin_unlock(&pd->lock);
	1136	+ if (!bio) {
	1137	+ pkt_dbg(2, pd, "no bio\n");
	1138	+ return 0;
	1139	+ }
	1140	+
	1141	+ pkt = pkt_get_packet_data(pd, zone);
	1142	+
	1143	+ pd->current_sector = zone + pd->settings.size;
	1144	+ pkt->sector = zone;
	1145	+ BUG_ON(pkt->frames != pd->settings.size >> 2);
	1146	+ pkt->write_size = 0;
	1147	+
	1148	+ /*
	1149	+ * Scan work queue for bios in the same zone and link them
	1150	+ * to this packet.
	1151	+ */
	1152	+ spin_lock(&pd->lock);
	1153	+ pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
	1154	+ while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
	1155	+ bio = node->bio;
	1156	+ pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
	1157	+ get_zone(bio->bi_iter.bi_sector, pd));
	1158	+ if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
	1159	+ break;
	1160	+ pkt_rbtree_erase(pd, node);
	1161	+ spin_lock(&pkt->lock);
	1162	+ bio_list_add(&pkt->orig_bios, bio);
	1163	+ pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
	1164	+ spin_unlock(&pkt->lock);
	1165	+ }
	1166	+ /* check write congestion marks, and if bio_queue_size is
	1167	+ * below, wake up any waiters
	1168	+ */
	1169	+ if (pd->congested &&
	1170	+ pd->bio_queue_size <= pd->write_congestion_off) {
	1171	+ pd->congested = false;
	1172	+ wake_up_var(&pd->congested);
	1173	+ }
	1174	+ spin_unlock(&pd->lock);
	1175	+
	1176	+ pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
	1177	+ pkt_set_state(pkt, PACKET_WAITING_STATE);
	1178	+ atomic_set(&pkt->run_sm, 1);
	1179	+
	1180	+ spin_lock(&pd->cdrw.active_list_lock);
	1181	+ list_add(&pkt->list, &pd->cdrw.pkt_active_list);
	1182	+ spin_unlock(&pd->cdrw.active_list_lock);
	1183	+
	1184	+ return 1;
	1185	+}
	1186	+
	1187	+/**
	1188	+ * bio_list_copy_data - copy contents of data buffers from one chain of bios to
	1189	+ * another
	1190	+ * @src: source bio list
	1191	+ * @dst: destination bio list
	1192	+ *
	1193	+ * Stops when it reaches the end of either the @src list or @dst list - that is,
	1194	+ * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of
	1195	+ * bios).
	1196	+ */
	1197	+static void bio_list_copy_data(struct bio dst, struct bio src)
	1198	+{
	1199	+ struct bvec_iter src_iter = src->bi_iter;
	1200	+ struct bvec_iter dst_iter = dst->bi_iter;
	1201	+
	1202	+ while (1) {
	1203	+ if (!src_iter.bi_size) {
	1204	+ src = src->bi_next;
	1205	+ if (!src)
	1206	+ break;
	1207	+
	1208	+ src_iter = src->bi_iter;
	1209	+ }
	1210	+
	1211	+ if (!dst_iter.bi_size) {
	1212	+ dst = dst->bi_next;
	1213	+ if (!dst)
	1214	+ break;
	1215	+
	1216	+ dst_iter = dst->bi_iter;
	1217	+ }
	1218	+
	1219	+ bio_copy_data_iter(dst, &dst_iter, src, &src_iter);
	1220	+ }
	1221	+}
	1222	+
	1223	+/*
	1224	+ * Assemble a bio to write one packet and queue the bio for processing
	1225	+ * by the underlying block device.
	1226	+ */
	1227	+static void pkt_start_write(struct pktcdvd_device pd, struct packet_data pkt)
	1228	+{
	1229	+ int f;
	1230	+
	1231	+ bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames,
	1232	+ REQ_OP_WRITE);
	1233	+ pkt->w_bio->bi_iter.bi_sector = pkt->sector;
	1234	+ pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
	1235	+ pkt->w_bio->bi_private = pkt;
	1236	+
	1237	+ /* XXX: locking? */
	1238	+ for (f = 0; f < pkt->frames; f++) {
	1239	+ struct page page = pkt->pages[(f CD_FRAMESIZE) / PAGE_SIZE];
	1240	+ unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
	1241	+
	1242	+ if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
	1243	+ BUG();
	1244	+ }
	1245	+ pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
	1246	+
	1247	+ /*
	1248	+ * Fill-in bvec with data from orig_bios.
	1249	+ */
	1250	+ spin_lock(&pkt->lock);
	1251	+ bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
	1252	+
	1253	+ pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
	1254	+ spin_unlock(&pkt->lock);
	1255	+
	1256	+ pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
	1257	+ pkt->write_size, (unsigned long long)pkt->sector);
	1258	+
	1259	+ if (test_bit(PACKET_MERGE_SEGS, &pd->flags) \|\| (pkt->write_size < pkt->frames))
	1260	+ pkt->cache_valid = 1;
	1261	+ else
	1262	+ pkt->cache_valid = 0;
	1263	+
	1264	+ /* Start the write request */
	1265	+ atomic_set(&pkt->io_wait, 1);
	1266	+ pkt_queue_bio(pd, pkt->w_bio);
	1267	+}
	1268	+
	1269	+static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
	1270	+{
	1271	+ struct bio *bio;
	1272	+
	1273	+ if (status)
	1274	+ pkt->cache_valid = 0;
	1275	+
	1276	+ /* Finish all bios corresponding to this packet */
	1277	+ while ((bio = bio_list_pop(&pkt->orig_bios))) {
	1278	+ bio->bi_status = status;
	1279	+ bio_endio(bio);
	1280	+ }
	1281	+}
	1282	+
	1283	+static void pkt_run_state_machine(struct pktcdvd_device pd, struct packet_data pkt)
	1284	+{
	1285	+ pkt_dbg(2, pd, "pkt %d\n", pkt->id);
	1286	+
	1287	+ for (;;) {
	1288	+ switch (pkt->state) {
	1289	+ case PACKET_WAITING_STATE:
	1290	+ if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
	1291	+ return;
	1292	+
	1293	+ pkt->sleep_time = 0;
	1294	+ pkt_gather_data(pd, pkt);
	1295	+ pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
	1296	+ break;
	1297	+
	1298	+ case PACKET_READ_WAIT_STATE:
	1299	+ if (atomic_read(&pkt->io_wait) > 0)
	1300	+ return;
	1301	+
	1302	+ if (atomic_read(&pkt->io_errors) > 0) {
	1303	+ pkt_set_state(pkt, PACKET_RECOVERY_STATE);
	1304	+ } else {
	1305	+ pkt_start_write(pd, pkt);
	1306	+ }
	1307	+ break;
	1308	+
	1309	+ case PACKET_WRITE_WAIT_STATE:
	1310	+ if (atomic_read(&pkt->io_wait) > 0)
	1311	+ return;
	1312	+
	1313	+ if (!pkt->w_bio->bi_status) {
	1314	+ pkt_set_state(pkt, PACKET_FINISHED_STATE);
	1315	+ } else {
	1316	+ pkt_set_state(pkt, PACKET_RECOVERY_STATE);
	1317	+ }
	1318	+ break;
	1319	+
	1320	+ case PACKET_RECOVERY_STATE:
	1321	+ pkt_dbg(2, pd, "No recovery possible\n");
	1322	+ pkt_set_state(pkt, PACKET_FINISHED_STATE);
	1323	+ break;
	1324	+
	1325	+ case PACKET_FINISHED_STATE:
	1326	+ pkt_finish_packet(pkt, pkt->w_bio->bi_status);
	1327	+ return;
	1328	+
	1329	+ default:
	1330	+ BUG();
	1331	+ break;
	1332	+ }
	1333	+ }
	1334	+}
	1335	+
	1336	+static void pkt_handle_packets(struct pktcdvd_device *pd)
	1337	+{
	1338	+ struct packet_data pkt, next;
	1339	+
	1340	+ /*
	1341	+ * Run state machine for active packets
	1342	+ */
	1343	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	1344	+ if (atomic_read(&pkt->run_sm) > 0) {
	1345	+ atomic_set(&pkt->run_sm, 0);
	1346	+ pkt_run_state_machine(pd, pkt);
	1347	+ }
	1348	+ }
	1349	+
	1350	+ /*
	1351	+ * Move no longer active packets to the free list
	1352	+ */
	1353	+ spin_lock(&pd->cdrw.active_list_lock);
	1354	+ list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
	1355	+ if (pkt->state == PACKET_FINISHED_STATE) {
	1356	+ list_del(&pkt->list);
	1357	+ pkt_put_packet_data(pd, pkt);
	1358	+ pkt_set_state(pkt, PACKET_IDLE_STATE);
	1359	+ atomic_set(&pd->scan_queue, 1);
	1360	+ }
	1361	+ }
	1362	+ spin_unlock(&pd->cdrw.active_list_lock);
	1363	+}
	1364	+
	1365	+static void pkt_count_states(struct pktcdvd_device pd, int states)
	1366	+{
	1367	+ struct packet_data *pkt;
	1368	+ int i;
	1369	+
	1370	+ for (i = 0; i < PACKET_NUM_STATES; i++)
	1371	+ states[i] = 0;
	1372	+
	1373	+ spin_lock(&pd->cdrw.active_list_lock);
	1374	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	1375	+ states[pkt->state]++;
	1376	+ }
	1377	+ spin_unlock(&pd->cdrw.active_list_lock);
	1378	+}
	1379	+
	1380	+/*
	1381	+ * kcdrwd is woken up when writes have been queued for one of our
	1382	+ * registered devices
	1383	+ */
	1384	+static int kcdrwd(void *foobar)
	1385	+{
	1386	+ struct pktcdvd_device *pd = foobar;
	1387	+ struct packet_data *pkt;
	1388	+ long min_sleep_time, residue;
	1389	+
	1390	+ set_user_nice(current, MIN_NICE);
	1391	+ set_freezable();
	1392	+
	1393	+ for (;;) {
	1394	+ DECLARE_WAITQUEUE(wait, current);
	1395	+
	1396	+ /*
	1397	+ * Wait until there is something to do
	1398	+ */
	1399	+ add_wait_queue(&pd->wqueue, &wait);
	1400	+ for (;;) {
	1401	+ set_current_state(TASK_INTERRUPTIBLE);
	1402	+
	1403	+ /* Check if we need to run pkt_handle_queue */
	1404	+ if (atomic_read(&pd->scan_queue) > 0)
	1405	+ goto work_to_do;
	1406	+
	1407	+ /* Check if we need to run the state machine for some packet */
	1408	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	1409	+ if (atomic_read(&pkt->run_sm) > 0)
	1410	+ goto work_to_do;
	1411	+ }
	1412	+
	1413	+ /* Check if we need to process the iosched queues */
	1414	+ if (atomic_read(&pd->iosched.attention) != 0)
	1415	+ goto work_to_do;
	1416	+
	1417	+ /* Otherwise, go to sleep */
	1418	+ if (PACKET_DEBUG > 1) {
	1419	+ int states[PACKET_NUM_STATES];
	1420	+ pkt_count_states(pd, states);
	1421	+ pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
	1422	+ states[0], states[1], states[2],
	1423	+ states[3], states[4], states[5]);
	1424	+ }
	1425	+
	1426	+ min_sleep_time = MAX_SCHEDULE_TIMEOUT;
	1427	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	1428	+ if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
	1429	+ min_sleep_time = pkt->sleep_time;
	1430	+ }
	1431	+
	1432	+ pkt_dbg(2, pd, "sleeping\n");
	1433	+ residue = schedule_timeout(min_sleep_time);
	1434	+ pkt_dbg(2, pd, "wake up\n");
	1435	+
	1436	+ /* make swsusp happy with our thread */
	1437	+ try_to_freeze();
	1438	+
	1439	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	1440	+ if (!pkt->sleep_time)
	1441	+ continue;
	1442	+ pkt->sleep_time -= min_sleep_time - residue;
	1443	+ if (pkt->sleep_time <= 0) {
	1444	+ pkt->sleep_time = 0;
	1445	+ atomic_inc(&pkt->run_sm);
	1446	+ }
	1447	+ }
	1448	+
	1449	+ if (kthread_should_stop())
	1450	+ break;
	1451	+ }
	1452	+work_to_do:
	1453	+ set_current_state(TASK_RUNNING);
	1454	+ remove_wait_queue(&pd->wqueue, &wait);
	1455	+
	1456	+ if (kthread_should_stop())
	1457	+ break;
	1458	+
	1459	+ /*
	1460	+ * if pkt_handle_queue returns true, we can queue
	1461	+ * another request.
	1462	+ */
	1463	+ while (pkt_handle_queue(pd))
	1464	+ ;
	1465	+
	1466	+ /*
	1467	+ * Handle packet state machine
	1468	+ */
	1469	+ pkt_handle_packets(pd);
	1470	+
	1471	+ /*
	1472	+ * Handle iosched queues
	1473	+ */
	1474	+ pkt_iosched_process_queue(pd);
	1475	+ }
	1476	+
	1477	+ return 0;
	1478	+}
	1479	+
	1480	+static void pkt_print_settings(struct pktcdvd_device *pd)
	1481	+{
	1482	+ pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
	1483	+ pd->settings.fp ? "Fixed" : "Variable",
	1484	+ pd->settings.size >> 2,
	1485	+ pd->settings.block_mode == 8 ? '1' : '2');
	1486	+}
	1487	+
	1488	+static int pkt_mode_sense(struct pktcdvd_device pd, struct packet_command cgc, int page_code, int page_control)
	1489	+{
	1490	+ memset(cgc->cmd, 0, sizeof(cgc->cmd));
	1491	+
	1492	+ cgc->cmd[0] = GPCMD_MODE_SENSE_10;
	1493	+ cgc->cmd[2] = page_code \| (page_control << 6);
	1494	+ cgc->cmd[7] = cgc->buflen >> 8;
	1495	+ cgc->cmd[8] = cgc->buflen & 0xff;
	1496	+ cgc->data_direction = CGC_DATA_READ;
	1497	+ return pkt_generic_packet(pd, cgc);
	1498	+}
	1499	+
	1500	+static int pkt_mode_select(struct pktcdvd_device pd, struct packet_command cgc)
	1501	+{
	1502	+ memset(cgc->cmd, 0, sizeof(cgc->cmd));
	1503	+ memset(cgc->buffer, 0, 2);
	1504	+ cgc->cmd[0] = GPCMD_MODE_SELECT_10;
	1505	+ cgc->cmd[1] = 0x10; /* PF */
	1506	+ cgc->cmd[7] = cgc->buflen >> 8;
	1507	+ cgc->cmd[8] = cgc->buflen & 0xff;
	1508	+ cgc->data_direction = CGC_DATA_WRITE;
	1509	+ return pkt_generic_packet(pd, cgc);
	1510	+}
	1511	+
	1512	+static int pkt_get_disc_info(struct pktcdvd_device pd, disc_information di)
	1513	+{
	1514	+ struct packet_command cgc;
	1515	+ int ret;
	1516	+
	1517	+ /* set up command and get the disc info */
	1518	+ init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
	1519	+ cgc.cmd[0] = GPCMD_READ_DISC_INFO;
	1520	+ cgc.cmd[8] = cgc.buflen = 2;
	1521	+ cgc.quiet = 1;
	1522	+
	1523	+ ret = pkt_generic_packet(pd, &cgc);
	1524	+ if (ret)
	1525	+ return ret;
	1526	+
	1527	+ /* not all drives have the same disc_info length, so requeue
	1528	+ * packet with the length the drive tells us it can supply
	1529	+ */
	1530	+ cgc.buflen = be16_to_cpu(di->disc_information_length) +
	1531	+ sizeof(di->disc_information_length);
	1532	+
	1533	+ if (cgc.buflen > sizeof(disc_information))
	1534	+ cgc.buflen = sizeof(disc_information);
	1535	+
	1536	+ cgc.cmd[8] = cgc.buflen;
	1537	+ return pkt_generic_packet(pd, &cgc);
	1538	+}
	1539	+
	1540	+static int pkt_get_track_info(struct pktcdvd_device pd, __u16 track, __u8 type, track_information ti)
	1541	+{
	1542	+ struct packet_command cgc;
	1543	+ int ret;
	1544	+
	1545	+ init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
	1546	+ cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
	1547	+ cgc.cmd[1] = type & 3;
	1548	+ cgc.cmd[4] = (track & 0xff00) >> 8;
	1549	+ cgc.cmd[5] = track & 0xff;
	1550	+ cgc.cmd[8] = 8;
	1551	+ cgc.quiet = 1;
	1552	+
	1553	+ ret = pkt_generic_packet(pd, &cgc);
	1554	+ if (ret)
	1555	+ return ret;
	1556	+
	1557	+ cgc.buflen = be16_to_cpu(ti->track_information_length) +
	1558	+ sizeof(ti->track_information_length);
	1559	+
	1560	+ if (cgc.buflen > sizeof(track_information))
	1561	+ cgc.buflen = sizeof(track_information);
	1562	+
	1563	+ cgc.cmd[8] = cgc.buflen;
	1564	+ return pkt_generic_packet(pd, &cgc);
	1565	+}
	1566	+
	1567	+static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
	1568	+ long *last_written)
	1569	+{
	1570	+ disc_information di;
	1571	+ track_information ti;
	1572	+ __u32 last_track;
	1573	+ int ret;
	1574	+
	1575	+ ret = pkt_get_disc_info(pd, &di);
	1576	+ if (ret)
	1577	+ return ret;
	1578	+
	1579	+ last_track = (di.last_track_msb << 8) \| di.last_track_lsb;
	1580	+ ret = pkt_get_track_info(pd, last_track, 1, &ti);
	1581	+ if (ret)
	1582	+ return ret;
	1583	+
	1584	+ /* if this track is blank, try the previous. */
	1585	+ if (ti.blank) {
	1586	+ last_track--;
	1587	+ ret = pkt_get_track_info(pd, last_track, 1, &ti);
	1588	+ if (ret)
	1589	+ return ret;
	1590	+ }
	1591	+
	1592	+ /* if last recorded field is valid, return it. */
	1593	+ if (ti.lra_v) {
	1594	+ *last_written = be32_to_cpu(ti.last_rec_address);
	1595	+ } else {
	1596	+ /* make it up instead */
	1597	+ *last_written = be32_to_cpu(ti.track_start) +
	1598	+ be32_to_cpu(ti.track_size);
	1599	+ if (ti.free_blocks)
	1600	+ *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
	1601	+ }
	1602	+ return 0;
	1603	+}
	1604	+
	1605	+/*
	1606	+ * write mode select package based on pd->settings
	1607	+ */
	1608	+static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
	1609	+{
	1610	+ struct packet_command cgc;
	1611	+ struct scsi_sense_hdr sshdr;
	1612	+ write_param_page *wp;
	1613	+ char buffer[128];
	1614	+ int ret, size;
	1615	+
	1616	+ /* doesn't apply to DVD+RW or DVD-RAM */
	1617	+ if ((pd->mmc3_profile == 0x1a) \|\| (pd->mmc3_profile == 0x12))
	1618	+ return 0;
	1619	+
	1620	+ memset(buffer, 0, sizeof(buffer));
	1621	+ init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
	1622	+ cgc.sshdr = &sshdr;
	1623	+ ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
	1624	+ if (ret) {
	1625	+ pkt_dump_sense(pd, &cgc);
	1626	+ return ret;
	1627	+ }
	1628	+
	1629	+ size = 2 + ((buffer[0] << 8) \| (buffer[1] & 0xff));
	1630	+ pd->mode_offset = (buffer[6] << 8) \| (buffer[7] & 0xff);
	1631	+ if (size > sizeof(buffer))
	1632	+ size = sizeof(buffer);
	1633	+
	1634	+ /*
	1635	+ * now get it all
	1636	+ */
	1637	+ init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
	1638	+ cgc.sshdr = &sshdr;
	1639	+ ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
	1640	+ if (ret) {
	1641	+ pkt_dump_sense(pd, &cgc);
	1642	+ return ret;
	1643	+ }
	1644	+
	1645	+ /*
	1646	+ * write page is offset header + block descriptor length
	1647	+ */
	1648	+ wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
	1649	+
	1650	+ wp->fp = pd->settings.fp;
	1651	+ wp->track_mode = pd->settings.track_mode;
	1652	+ wp->write_type = pd->settings.write_type;
	1653	+ wp->data_block_type = pd->settings.block_mode;
	1654	+
	1655	+ wp->multi_session = 0;
	1656	+
	1657	+#ifdef PACKET_USE_LS
	1658	+ wp->link_size = 7;
	1659	+ wp->ls_v = 1;
	1660	+#endif
	1661	+
	1662	+ if (wp->data_block_type == PACKET_BLOCK_MODE1) {
	1663	+ wp->session_format = 0;
	1664	+ wp->subhdr2 = 0x20;
	1665	+ } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
	1666	+ wp->session_format = 0x20;
	1667	+ wp->subhdr2 = 8;
	1668	+#if 0
	1669	+ wp->mcn[0] = 0x80;
	1670	+ memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
	1671	+#endif
	1672	+ } else {
	1673	+ /*
	1674	+ * paranoia
	1675	+ */
	1676	+ pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
	1677	+ return 1;
	1678	+ }
	1679	+ wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
	1680	+
	1681	+ cgc.buflen = cgc.cmd[8] = size;
	1682	+ ret = pkt_mode_select(pd, &cgc);
	1683	+ if (ret) {
	1684	+ pkt_dump_sense(pd, &cgc);
	1685	+ return ret;
	1686	+ }
	1687	+
	1688	+ pkt_print_settings(pd);
	1689	+ return 0;
	1690	+}
	1691	+
	1692	+/*
	1693	+ * 1 -- we can write to this track, 0 -- we can't
	1694	+ */
	1695	+static int pkt_writable_track(struct pktcdvd_device pd, track_information ti)
	1696	+{
	1697	+ switch (pd->mmc3_profile) {
	1698	+ case 0x1a: /* DVD+RW */
	1699	+ case 0x12: /* DVD-RAM */
	1700	+ /* The track is always writable on DVD+RW/DVD-RAM */
	1701	+ return 1;
	1702	+ default:
	1703	+ break;
	1704	+ }
	1705	+
	1706	+ if (!ti->packet \|\| !ti->fp)
	1707	+ return 0;
	1708	+
	1709	+ /*
	1710	+ * "good" settings as per Mt Fuji.
	1711	+ */
	1712	+ if (ti->rt == 0 && ti->blank == 0)
	1713	+ return 1;
	1714	+
	1715	+ if (ti->rt == 0 && ti->blank == 1)
	1716	+ return 1;
	1717	+
	1718	+ if (ti->rt == 1 && ti->blank == 0)
	1719	+ return 1;
	1720	+
	1721	+ pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
	1722	+ return 0;
	1723	+}
	1724	+
	1725	+/*
	1726	+ * 1 -- we can write to this disc, 0 -- we can't
	1727	+ */
	1728	+static int pkt_writable_disc(struct pktcdvd_device pd, disc_information di)
	1729	+{
	1730	+ switch (pd->mmc3_profile) {
	1731	+ case 0x0a: /* CD-RW */
	1732	+ case 0xffff: /* MMC3 not supported */
	1733	+ break;
	1734	+ case 0x1a: /* DVD+RW */
	1735	+ case 0x13: /* DVD-RW */
	1736	+ case 0x12: /* DVD-RAM */
	1737	+ return 1;
	1738	+ default:
	1739	+ pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
	1740	+ pd->mmc3_profile);
	1741	+ return 0;
	1742	+ }
	1743	+
	1744	+ /*
	1745	+ * for disc type 0xff we should probably reserve a new track.
	1746	+ * but i'm not sure, should we leave this to user apps? probably.
	1747	+ */
	1748	+ if (di->disc_type == 0xff) {
	1749	+ pkt_notice(pd, "unknown disc - no track?\n");
	1750	+ return 0;
	1751	+ }
	1752	+
	1753	+ if (di->disc_type != 0x20 && di->disc_type != 0) {
	1754	+ pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
	1755	+ return 0;
	1756	+ }
	1757	+
	1758	+ if (di->erasable == 0) {
	1759	+ pkt_notice(pd, "disc not erasable\n");
	1760	+ return 0;
	1761	+ }
	1762	+
	1763	+ if (di->border_status == PACKET_SESSION_RESERVED) {
	1764	+ pkt_err(pd, "can't write to last track (reserved)\n");
	1765	+ return 0;
	1766	+ }
	1767	+
	1768	+ return 1;
	1769	+}
	1770	+
	1771	+static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
	1772	+{
	1773	+ struct packet_command cgc;
	1774	+ unsigned char buf[12];
	1775	+ disc_information di;
	1776	+ track_information ti;
	1777	+ int ret, track;
	1778	+
	1779	+ init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	1780	+ cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
	1781	+ cgc.cmd[8] = 8;
	1782	+ ret = pkt_generic_packet(pd, &cgc);
	1783	+ pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 \| buf[7];
	1784	+
	1785	+ memset(&di, 0, sizeof(disc_information));
	1786	+ memset(&ti, 0, sizeof(track_information));
	1787	+
	1788	+ ret = pkt_get_disc_info(pd, &di);
	1789	+ if (ret) {
	1790	+ pkt_err(pd, "failed get_disc\n");
	1791	+ return ret;
	1792	+ }
	1793	+
	1794	+ if (!pkt_writable_disc(pd, &di))
	1795	+ return -EROFS;
	1796	+
	1797	+ pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
	1798	+
	1799	+ track = 1; /* (di.last_track_msb << 8) \| di.last_track_lsb; */
	1800	+ ret = pkt_get_track_info(pd, track, 1, &ti);
	1801	+ if (ret) {
	1802	+ pkt_err(pd, "failed get_track\n");
	1803	+ return ret;
	1804	+ }
	1805	+
	1806	+ if (!pkt_writable_track(pd, &ti)) {
	1807	+ pkt_err(pd, "can't write to this track\n");
	1808	+ return -EROFS;
	1809	+ }
	1810	+
	1811	+ /*
	1812	+ * we keep packet size in 512 byte units, makes it easier to
	1813	+ * deal with request calculations.
	1814	+ */
	1815	+ pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
	1816	+ if (pd->settings.size == 0) {
	1817	+ pkt_notice(pd, "detected zero packet size!\n");
	1818	+ return -ENXIO;
	1819	+ }
	1820	+ if (pd->settings.size > PACKET_MAX_SECTORS) {
	1821	+ pkt_err(pd, "packet size is too big\n");
	1822	+ return -EROFS;
	1823	+ }
	1824	+ pd->settings.fp = ti.fp;
	1825	+ pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
	1826	+
	1827	+ if (ti.nwa_v) {
	1828	+ pd->nwa = be32_to_cpu(ti.next_writable);
	1829	+ set_bit(PACKET_NWA_VALID, &pd->flags);
	1830	+ }
	1831	+
	1832	+ /*
	1833	+ * in theory we could use lra on -RW media as well and just zero
	1834	+ * blocks that haven't been written yet, but in practice that
	1835	+ * is just a no-go. we'll use that for -R, naturally.
	1836	+ */
	1837	+ if (ti.lra_v) {
	1838	+ pd->lra = be32_to_cpu(ti.last_rec_address);
	1839	+ set_bit(PACKET_LRA_VALID, &pd->flags);
	1840	+ } else {
	1841	+ pd->lra = 0xffffffff;
	1842	+ set_bit(PACKET_LRA_VALID, &pd->flags);
	1843	+ }
	1844	+
	1845	+ /*
	1846	+ * fine for now
	1847	+ */
	1848	+ pd->settings.link_loss = 7;
	1849	+ pd->settings.write_type = 0; /* packet */
	1850	+ pd->settings.track_mode = ti.track_mode;
	1851	+
	1852	+ /*
	1853	+ * mode1 or mode2 disc
	1854	+ */
	1855	+ switch (ti.data_mode) {
	1856	+ case PACKET_MODE1:
	1857	+ pd->settings.block_mode = PACKET_BLOCK_MODE1;
	1858	+ break;
	1859	+ case PACKET_MODE2:
	1860	+ pd->settings.block_mode = PACKET_BLOCK_MODE2;
	1861	+ break;
	1862	+ default:
	1863	+ pkt_err(pd, "unknown data mode\n");
	1864	+ return -EROFS;
	1865	+ }
	1866	+ return 0;
	1867	+}
	1868	+
	1869	+/*
	1870	+ * enable/disable write caching on drive
	1871	+ */
	1872	+static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
	1873	+ int set)
	1874	+{
	1875	+ struct packet_command cgc;
	1876	+ struct scsi_sense_hdr sshdr;
	1877	+ unsigned char buf[64];
	1878	+ int ret;
	1879	+
	1880	+ init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	1881	+ cgc.sshdr = &sshdr;
	1882	+ cgc.buflen = pd->mode_offset + 12;
	1883	+
	1884	+ /*
	1885	+ * caching mode page might not be there, so quiet this command
	1886	+ */
	1887	+ cgc.quiet = 1;
	1888	+
	1889	+ ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
	1890	+ if (ret)
	1891	+ return ret;
	1892	+
	1893	+ buf[pd->mode_offset + 10] \|= (!!set << 2);
	1894	+
	1895	+ cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) \| (buf[1] & 0xff));
	1896	+ ret = pkt_mode_select(pd, &cgc);
	1897	+ if (ret) {
	1898	+ pkt_err(pd, "write caching control failed\n");
	1899	+ pkt_dump_sense(pd, &cgc);
	1900	+ } else if (!ret && set)
	1901	+ pkt_notice(pd, "enabled write caching\n");
	1902	+ return ret;
	1903	+}
	1904	+
	1905	+static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
	1906	+{
	1907	+ struct packet_command cgc;
	1908	+
	1909	+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	1910	+ cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
	1911	+ cgc.cmd[4] = lockflag ? 1 : 0;
	1912	+ return pkt_generic_packet(pd, &cgc);
	1913	+}
	1914	+
	1915	+/*
	1916	+ * Returns drive maximum write speed
	1917	+ */
	1918	+static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
	1919	+ unsigned *write_speed)
	1920	+{
	1921	+ struct packet_command cgc;
	1922	+ struct scsi_sense_hdr sshdr;
	1923	+ unsigned char buf[256+18];
	1924	+ unsigned char *cap_buf;
	1925	+ int ret, offset;
	1926	+
	1927	+ cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
	1928	+ init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
	1929	+ cgc.sshdr = &sshdr;
	1930	+
	1931	+ ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
	1932	+ if (ret) {
	1933	+ cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
	1934	+ sizeof(struct mode_page_header);
	1935	+ ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
	1936	+ if (ret) {
	1937	+ pkt_dump_sense(pd, &cgc);
	1938	+ return ret;
	1939	+ }
	1940	+ }
	1941	+
	1942	+ offset = 20; /* Obsoleted field, used by older drives */
	1943	+ if (cap_buf[1] >= 28)
	1944	+ offset = 28; /* Current write speed selected */
	1945	+ if (cap_buf[1] >= 30) {
	1946	+ /* If the drive reports at least one "Logical Unit Write
	1947	+ * Speed Performance Descriptor Block", use the information
	1948	+ * in the first block. (contains the highest speed)
	1949	+ */
	1950	+ int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
	1951	+ if (num_spdb > 0)
	1952	+ offset = 34;
	1953	+ }
	1954	+
	1955	+ *write_speed = (cap_buf[offset] << 8) \| cap_buf[offset + 1];
	1956	+ return 0;
	1957	+}
	1958	+
	1959	+/* These tables from cdrecord - I don't have orange book */
	1960	+/* standard speed CD-RW (1-4x) */
	1961	+static char clv_to_speed[16] = {
	1962	+ /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
	1963	+ 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
	1964	+};
	1965	+/* high speed CD-RW (-10x) */
	1966	+static char hs_clv_to_speed[16] = {
	1967	+ /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
	1968	+ 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
	1969	+};
	1970	+/* ultra high speed CD-RW */
	1971	+static char us_clv_to_speed[16] = {
	1972	+ /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
	1973	+ 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
	1974	+};
	1975	+
	1976	+/*
	1977	+ * reads the maximum media speed from ATIP
	1978	+ */
	1979	+static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
	1980	+ unsigned *speed)
	1981	+{
	1982	+ struct packet_command cgc;
	1983	+ struct scsi_sense_hdr sshdr;
	1984	+ unsigned char buf[64];
	1985	+ unsigned int size, st, sp;
	1986	+ int ret;
	1987	+
	1988	+ init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
	1989	+ cgc.sshdr = &sshdr;
	1990	+ cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	1991	+ cgc.cmd[1] = 2;
	1992	+ cgc.cmd[2] = 4; /* READ ATIP */
	1993	+ cgc.cmd[8] = 2;
	1994	+ ret = pkt_generic_packet(pd, &cgc);
	1995	+ if (ret) {
	1996	+ pkt_dump_sense(pd, &cgc);
	1997	+ return ret;
	1998	+ }
	1999	+ size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
	2000	+ if (size > sizeof(buf))
	2001	+ size = sizeof(buf);
	2002	+
	2003	+ init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
	2004	+ cgc.sshdr = &sshdr;
	2005	+ cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	2006	+ cgc.cmd[1] = 2;
	2007	+ cgc.cmd[2] = 4;
	2008	+ cgc.cmd[8] = size;
	2009	+ ret = pkt_generic_packet(pd, &cgc);
	2010	+ if (ret) {
	2011	+ pkt_dump_sense(pd, &cgc);
	2012	+ return ret;
	2013	+ }
	2014	+
	2015	+ if (!(buf[6] & 0x40)) {
	2016	+ pkt_notice(pd, "disc type is not CD-RW\n");
	2017	+ return 1;
	2018	+ }
	2019	+ if (!(buf[6] & 0x4)) {
	2020	+ pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
	2021	+ return 1;
	2022	+ }
	2023	+
	2024	+ st = (buf[6] >> 3) & 0x7; /* disc sub-type */
	2025	+
	2026	+ sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
	2027	+
	2028	+ /* Info from cdrecord */
	2029	+ switch (st) {
	2030	+ case 0: /* standard speed */
	2031	+ *speed = clv_to_speed[sp];
	2032	+ break;
	2033	+ case 1: /* high speed */
	2034	+ *speed = hs_clv_to_speed[sp];
	2035	+ break;
	2036	+ case 2: /* ultra high speed */
	2037	+ *speed = us_clv_to_speed[sp];
	2038	+ break;
	2039	+ default:
	2040	+ pkt_notice(pd, "unknown disc sub-type %d\n", st);
	2041	+ return 1;
	2042	+ }
	2043	+ if (*speed) {
	2044	+ pkt_info(pd, "maximum media speed: %d\n", *speed);
	2045	+ return 0;
	2046	+ } else {
	2047	+ pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
	2048	+ return 1;
	2049	+ }
	2050	+}
	2051	+
	2052	+static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
	2053	+{
	2054	+ struct packet_command cgc;
	2055	+ struct scsi_sense_hdr sshdr;
	2056	+ int ret;
	2057	+
	2058	+ pkt_dbg(2, pd, "Performing OPC\n");
	2059	+
	2060	+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	2061	+ cgc.sshdr = &sshdr;
	2062	+ cgc.timeout = 60*HZ;
	2063	+ cgc.cmd[0] = GPCMD_SEND_OPC;
	2064	+ cgc.cmd[1] = 1;
	2065	+ ret = pkt_generic_packet(pd, &cgc);
	2066	+ if (ret)
	2067	+ pkt_dump_sense(pd, &cgc);
	2068	+ return ret;
	2069	+}
	2070	+
	2071	+static int pkt_open_write(struct pktcdvd_device *pd)
	2072	+{
	2073	+ int ret;
	2074	+ unsigned int write_speed, media_write_speed, read_speed;
	2075	+
	2076	+ ret = pkt_probe_settings(pd);
	2077	+ if (ret) {
	2078	+ pkt_dbg(2, pd, "failed probe\n");
	2079	+ return ret;
	2080	+ }
	2081	+
	2082	+ ret = pkt_set_write_settings(pd);
	2083	+ if (ret) {
	2084	+ pkt_dbg(1, pd, "failed saving write settings\n");
	2085	+ return -EIO;
	2086	+ }
	2087	+
	2088	+ pkt_write_caching(pd, USE_WCACHING);
	2089	+
	2090	+ ret = pkt_get_max_speed(pd, &write_speed);
	2091	+ if (ret)
	2092	+ write_speed = 16 * 177;
	2093	+ switch (pd->mmc3_profile) {
	2094	+ case 0x13: /* DVD-RW */
	2095	+ case 0x1a: /* DVD+RW */
	2096	+ case 0x12: /* DVD-RAM */
	2097	+ pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
	2098	+ break;
	2099	+ default:
	2100	+ ret = pkt_media_speed(pd, &media_write_speed);
	2101	+ if (ret)
	2102	+ media_write_speed = 16;
	2103	+ write_speed = min(write_speed, media_write_speed * 177);
	2104	+ pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
	2105	+ break;
	2106	+ }
	2107	+ read_speed = write_speed;
	2108	+
	2109	+ ret = pkt_set_speed(pd, write_speed, read_speed);
	2110	+ if (ret) {
	2111	+ pkt_dbg(1, pd, "couldn't set write speed\n");
	2112	+ return -EIO;
	2113	+ }
	2114	+ pd->write_speed = write_speed;
	2115	+ pd->read_speed = read_speed;
	2116	+
	2117	+ ret = pkt_perform_opc(pd);
	2118	+ if (ret) {
	2119	+ pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
	2120	+ }
	2121	+
	2122	+ return 0;
	2123	+}
	2124	+
	2125	+/*
	2126	+ * called at open time.
	2127	+ */
	2128	+static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
	2129	+{
	2130	+ int ret;
	2131	+ long lba;
	2132	+ struct request_queue *q;
	2133	+ struct block_device *bdev;
	2134	+
	2135	+ /*
	2136	+ * We need to re-open the cdrom device without O_NONBLOCK to be able
	2137	+ * to read/write from/to it. It is already opened in O_NONBLOCK mode
	2138	+ * so open should not fail.
	2139	+ */
	2140	+ bdev = blkdev_get_by_dev(pd->bdev->bd_dev, FMODE_READ \| FMODE_EXCL, pd);
	2141	+ if (IS_ERR(bdev)) {
	2142	+ ret = PTR_ERR(bdev);
	2143	+ goto out;
	2144	+ }
	2145	+
	2146	+ ret = pkt_get_last_written(pd, &lba);
	2147	+ if (ret) {
	2148	+ pkt_err(pd, "pkt_get_last_written failed\n");
	2149	+ goto out_putdev;
	2150	+ }
	2151	+
	2152	+ set_capacity(pd->disk, lba << 2);
	2153	+ set_capacity_and_notify(pd->bdev->bd_disk, lba << 2);
	2154	+
	2155	+ q = bdev_get_queue(pd->bdev);
	2156	+ if (write) {
	2157	+ ret = pkt_open_write(pd);
	2158	+ if (ret)
	2159	+ goto out_putdev;
	2160	+ /*
	2161	+ * Some CDRW drives can not handle writes larger than one packet,
	2162	+ * even if the size is a multiple of the packet size.
	2163	+ */
	2164	+ blk_queue_max_hw_sectors(q, pd->settings.size);
	2165	+ set_bit(PACKET_WRITABLE, &pd->flags);
	2166	+ } else {
	2167	+ pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
	2168	+ clear_bit(PACKET_WRITABLE, &pd->flags);
	2169	+ }
	2170	+
	2171	+ ret = pkt_set_segment_merging(pd, q);
	2172	+ if (ret)
	2173	+ goto out_putdev;
	2174	+
	2175	+ if (write) {
	2176	+ if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
	2177	+ pkt_err(pd, "not enough memory for buffers\n");
	2178	+ ret = -ENOMEM;
	2179	+ goto out_putdev;
	2180	+ }
	2181	+ pkt_info(pd, "%lukB available on disc\n", lba << 1);
	2182	+ }
	2183	+
	2184	+ return 0;
	2185	+
	2186	+out_putdev:
	2187	+ blkdev_put(bdev, FMODE_READ \| FMODE_EXCL);
	2188	+out:
	2189	+ return ret;
	2190	+}
	2191	+
	2192	+/*
	2193	+ * called when the device is closed. makes sure that the device flushes
	2194	+ * the internal cache before we close.
	2195	+ */
	2196	+static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
	2197	+{
	2198	+ if (flush && pkt_flush_cache(pd))
	2199	+ pkt_dbg(1, pd, "not flushing cache\n");
	2200	+
	2201	+ pkt_lock_door(pd, 0);
	2202	+
	2203	+ pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
	2204	+ blkdev_put(pd->bdev, FMODE_READ \| FMODE_EXCL);
	2205	+
	2206	+ pkt_shrink_pktlist(pd);
	2207	+}
	2208	+
	2209	+static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
	2210	+{
	2211	+ if (dev_minor >= MAX_WRITERS)
	2212	+ return NULL;
	2213	+
	2214	+ dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
	2215	+ return pkt_devs[dev_minor];
	2216	+}
	2217	+
	2218	+static int pkt_open(struct block_device *bdev, fmode_t mode)
	2219	+{
	2220	+ struct pktcdvd_device *pd = NULL;
	2221	+ int ret;
	2222	+
	2223	+ mutex_lock(&pktcdvd_mutex);
	2224	+ mutex_lock(&ctl_mutex);
	2225	+ pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
	2226	+ if (!pd) {
	2227	+ ret = -ENODEV;
	2228	+ goto out;
	2229	+ }
	2230	+ BUG_ON(pd->refcnt < 0);
	2231	+
	2232	+ pd->refcnt++;
	2233	+ if (pd->refcnt > 1) {
	2234	+ if ((mode & FMODE_WRITE) &&
	2235	+ !test_bit(PACKET_WRITABLE, &pd->flags)) {
	2236	+ ret = -EBUSY;
	2237	+ goto out_dec;
	2238	+ }
	2239	+ } else {
	2240	+ ret = pkt_open_dev(pd, mode & FMODE_WRITE);
	2241	+ if (ret)
	2242	+ goto out_dec;
	2243	+ /*
	2244	+ * needed here as well, since ext2 (among others) may change
	2245	+ * the blocksize at mount time
	2246	+ */
	2247	+ set_blocksize(bdev, CD_FRAMESIZE);
	2248	+ }
	2249	+
	2250	+ mutex_unlock(&ctl_mutex);
	2251	+ mutex_unlock(&pktcdvd_mutex);
	2252	+ return 0;
	2253	+
	2254	+out_dec:
	2255	+ pd->refcnt--;
	2256	+out:
	2257	+ mutex_unlock(&ctl_mutex);
	2258	+ mutex_unlock(&pktcdvd_mutex);
	2259	+ return ret;
	2260	+}
	2261	+
	2262	+static void pkt_close(struct gendisk *disk, fmode_t mode)
	2263	+{
	2264	+ struct pktcdvd_device *pd = disk->private_data;
	2265	+
	2266	+ mutex_lock(&pktcdvd_mutex);
	2267	+ mutex_lock(&ctl_mutex);
	2268	+ pd->refcnt--;
	2269	+ BUG_ON(pd->refcnt < 0);
	2270	+ if (pd->refcnt == 0) {
	2271	+ int flush = test_bit(PACKET_WRITABLE, &pd->flags);
	2272	+ pkt_release_dev(pd, flush);
	2273	+ }
	2274	+ mutex_unlock(&ctl_mutex);
	2275	+ mutex_unlock(&pktcdvd_mutex);
	2276	+}
	2277	+
	2278	+
	2279	+static void pkt_end_io_read_cloned(struct bio *bio)
	2280	+{
	2281	+ struct packet_stacked_data *psd = bio->bi_private;
	2282	+ struct pktcdvd_device *pd = psd->pd;
	2283	+
	2284	+ psd->bio->bi_status = bio->bi_status;
	2285	+ bio_put(bio);
	2286	+ bio_endio(psd->bio);
	2287	+ mempool_free(psd, &psd_pool);
	2288	+ pkt_bio_finished(pd);
	2289	+}
	2290	+
	2291	+static void pkt_make_request_read(struct pktcdvd_device pd, struct bio bio)
	2292	+{
	2293	+ struct bio *cloned_bio =
	2294	+ bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set);
	2295	+ struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
	2296	+
	2297	+ psd->pd = pd;
	2298	+ psd->bio = bio;
	2299	+ cloned_bio->bi_private = psd;
	2300	+ cloned_bio->bi_end_io = pkt_end_io_read_cloned;
	2301	+ pd->stats.secs_r += bio_sectors(bio);
	2302	+ pkt_queue_bio(pd, cloned_bio);
	2303	+}
	2304	+
	2305	+static void pkt_make_request_write(struct request_queue q, struct bio bio)
	2306	+{
	2307	+ struct pktcdvd_device *pd = q->queuedata;
	2308	+ sector_t zone;
	2309	+ struct packet_data *pkt;
	2310	+ int was_empty, blocked_bio;
	2311	+ struct pkt_rb_node *node;
	2312	+
	2313	+ zone = get_zone(bio->bi_iter.bi_sector, pd);
	2314	+
	2315	+ /*
	2316	+ * If we find a matching packet in state WAITING or READ_WAIT, we can
	2317	+ * just append this bio to that packet.
	2318	+ */
	2319	+ spin_lock(&pd->cdrw.active_list_lock);
	2320	+ blocked_bio = 0;
	2321	+ list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
	2322	+ if (pkt->sector == zone) {
	2323	+ spin_lock(&pkt->lock);
	2324	+ if ((pkt->state == PACKET_WAITING_STATE) \|\|
	2325	+ (pkt->state == PACKET_READ_WAIT_STATE)) {
	2326	+ bio_list_add(&pkt->orig_bios, bio);
	2327	+ pkt->write_size +=
	2328	+ bio->bi_iter.bi_size / CD_FRAMESIZE;
	2329	+ if ((pkt->write_size >= pkt->frames) &&
	2330	+ (pkt->state == PACKET_WAITING_STATE)) {
	2331	+ atomic_inc(&pkt->run_sm);
	2332	+ wake_up(&pd->wqueue);
	2333	+ }
	2334	+ spin_unlock(&pkt->lock);
	2335	+ spin_unlock(&pd->cdrw.active_list_lock);
	2336	+ return;
	2337	+ } else {
	2338	+ blocked_bio = 1;
	2339	+ }
	2340	+ spin_unlock(&pkt->lock);
	2341	+ }
	2342	+ }
	2343	+ spin_unlock(&pd->cdrw.active_list_lock);
	2344	+
	2345	+ /*
	2346	+ * Test if there is enough room left in the bio work queue
	2347	+ * (queue size >= congestion on mark).
	2348	+ * If not, wait till the work queue size is below the congestion off mark.
	2349	+ */
	2350	+ spin_lock(&pd->lock);
	2351	+ if (pd->write_congestion_on > 0
	2352	+ && pd->bio_queue_size >= pd->write_congestion_on) {
	2353	+ struct wait_bit_queue_entry wqe;
	2354	+
	2355	+ init_wait_var_entry(&wqe, &pd->congested, 0);
	2356	+ for (;;) {
	2357	+ prepare_to_wait_event(__var_waitqueue(&pd->congested),
	2358	+ &wqe.wq_entry,
	2359	+ TASK_UNINTERRUPTIBLE);
	2360	+ if (pd->bio_queue_size <= pd->write_congestion_off)
	2361	+ break;
	2362	+ pd->congested = true;
	2363	+ spin_unlock(&pd->lock);
	2364	+ schedule();
	2365	+ spin_lock(&pd->lock);
	2366	+ }
	2367	+ }
	2368	+ spin_unlock(&pd->lock);
	2369	+
	2370	+ /*
	2371	+ * No matching packet found. Store the bio in the work queue.
	2372	+ */
	2373	+ node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
	2374	+ node->bio = bio;
	2375	+ spin_lock(&pd->lock);
	2376	+ BUG_ON(pd->bio_queue_size < 0);
	2377	+ was_empty = (pd->bio_queue_size == 0);
	2378	+ pkt_rbtree_insert(pd, node);
	2379	+ spin_unlock(&pd->lock);
	2380	+
	2381	+ /*
	2382	+ * Wake up the worker thread.
	2383	+ */
	2384	+ atomic_set(&pd->scan_queue, 1);
	2385	+ if (was_empty) {
	2386	+ /* This wake_up is required for correct operation */
	2387	+ wake_up(&pd->wqueue);
	2388	+ } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
	2389	+ /*
	2390	+ * This wake up is not required for correct operation,
	2391	+ * but improves performance in some cases.
	2392	+ */
	2393	+ wake_up(&pd->wqueue);
	2394	+ }
	2395	+}
	2396	+
	2397	+static void pkt_submit_bio(struct bio *bio)
	2398	+{
	2399	+ struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata;
	2400	+ struct bio *split;
	2401	+
	2402	+ bio = bio_split_to_limits(bio);
	2403	+
	2404	+ pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
	2405	+ (unsigned long long)bio->bi_iter.bi_sector,
	2406	+ (unsigned long long)bio_end_sector(bio));
	2407	+
	2408	+ /*
	2409	+ * Clone READ bios so we can have our own bi_end_io callback.
	2410	+ */
	2411	+ if (bio_data_dir(bio) == READ) {
	2412	+ pkt_make_request_read(pd, bio);
	2413	+ return;
	2414	+ }
	2415	+
	2416	+ if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
	2417	+ pkt_notice(pd, "WRITE for ro device (%llu)\n",
	2418	+ (unsigned long long)bio->bi_iter.bi_sector);
	2419	+ goto end_io;
	2420	+ }
	2421	+
	2422	+ if (!bio->bi_iter.bi_size \|\| (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
	2423	+ pkt_err(pd, "wrong bio size\n");
	2424	+ goto end_io;
	2425	+ }
	2426	+
	2427	+ do {
	2428	+ sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
	2429	+ sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
	2430	+
	2431	+ if (last_zone != zone) {
	2432	+ BUG_ON(last_zone != zone + pd->settings.size);
	2433	+
	2434	+ split = bio_split(bio, last_zone -
	2435	+ bio->bi_iter.bi_sector,
	2436	+ GFP_NOIO, &pkt_bio_set);
	2437	+ bio_chain(split, bio);
	2438	+ } else {
	2439	+ split = bio;
	2440	+ }
	2441	+
	2442	+ pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split);
	2443	+ } while (split != bio);
	2444	+
	2445	+ return;
	2446	+end_io:
	2447	+ bio_io_error(bio);
	2448	+}
	2449	+
	2450	+static void pkt_init_queue(struct pktcdvd_device *pd)
	2451	+{
	2452	+ struct request_queue *q = pd->disk->queue;
	2453	+
	2454	+ blk_queue_logical_block_size(q, CD_FRAMESIZE);
	2455	+ blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
	2456	+ q->queuedata = pd;
	2457	+}
	2458	+
	2459	+static int pkt_seq_show(struct seq_file m, void p)
	2460	+{
	2461	+ struct pktcdvd_device *pd = m->private;
	2462	+ char *msg;
	2463	+ int states[PACKET_NUM_STATES];
	2464	+
	2465	+ seq_printf(m, "Writer %s mapped to %pg:\n", pd->name, pd->bdev);
	2466	+
	2467	+ seq_printf(m, "\nSettings:\n");
	2468	+ seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
	2469	+
	2470	+ if (pd->settings.write_type == 0)
	2471	+ msg = "Packet";
	2472	+ else
	2473	+ msg = "Unknown";
	2474	+ seq_printf(m, "\twrite type:\t\t%s\n", msg);
	2475	+
	2476	+ seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
	2477	+ seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
	2478	+
	2479	+ seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
	2480	+
	2481	+ if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
	2482	+ msg = "Mode 1";
	2483	+ else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
	2484	+ msg = "Mode 2";
	2485	+ else
	2486	+ msg = "Unknown";
	2487	+ seq_printf(m, "\tblock mode:\t\t%s\n", msg);
	2488	+
	2489	+ seq_printf(m, "\nStatistics:\n");
	2490	+ seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
	2491	+ seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
	2492	+ seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
	2493	+ seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
	2494	+ seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
	2495	+
	2496	+ seq_printf(m, "\nMisc:\n");
	2497	+ seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
	2498	+ seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
	2499	+ seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
	2500	+ seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
	2501	+ seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
	2502	+ seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
	2503	+
	2504	+ seq_printf(m, "\nQueue state:\n");
	2505	+ seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
	2506	+ seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
	2507	+ seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
	2508	+
	2509	+ pkt_count_states(pd, states);
	2510	+ seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
	2511	+ states[0], states[1], states[2], states[3], states[4], states[5]);
	2512	+
	2513	+ seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
	2514	+ pd->write_congestion_off,
	2515	+ pd->write_congestion_on);
	2516	+ return 0;
	2517	+}
	2518	+
	2519	+static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
	2520	+{
	2521	+ int i;
	2522	+ struct block_device *bdev;
	2523	+ struct scsi_device *sdev;
	2524	+
	2525	+ if (pd->pkt_dev == dev) {
	2526	+ pkt_err(pd, "recursive setup not allowed\n");
	2527	+ return -EBUSY;
	2528	+ }
	2529	+ for (i = 0; i < MAX_WRITERS; i++) {
	2530	+ struct pktcdvd_device *pd2 = pkt_devs[i];
	2531	+ if (!pd2)
	2532	+ continue;
	2533	+ if (pd2->bdev->bd_dev == dev) {
	2534	+ pkt_err(pd, "%pg already setup\n", pd2->bdev);
	2535	+ return -EBUSY;
	2536	+ }
	2537	+ if (pd2->pkt_dev == dev) {
	2538	+ pkt_err(pd, "can't chain pktcdvd devices\n");
	2539	+ return -EBUSY;
	2540	+ }
	2541	+ }
	2542	+
	2543	+ bdev = blkdev_get_by_dev(dev, FMODE_READ \| FMODE_NDELAY, NULL);
	2544	+ if (IS_ERR(bdev))
	2545	+ return PTR_ERR(bdev);
	2546	+ sdev = scsi_device_from_queue(bdev->bd_disk->queue);
	2547	+ if (!sdev) {
	2548	+ blkdev_put(bdev, FMODE_READ \| FMODE_NDELAY);
	2549	+ return -EINVAL;
	2550	+ }
	2551	+ put_device(&sdev->sdev_gendev);
	2552	+
	2553	+ /* This is safe, since we have a reference from open(). */
	2554	+ __module_get(THIS_MODULE);
	2555	+
	2556	+ pd->bdev = bdev;
	2557	+ set_blocksize(bdev, CD_FRAMESIZE);
	2558	+
	2559	+ pkt_init_queue(pd);
	2560	+
	2561	+ atomic_set(&pd->cdrw.pending_bios, 0);
	2562	+ pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
	2563	+ if (IS_ERR(pd->cdrw.thread)) {
	2564	+ pkt_err(pd, "can't start kernel thread\n");
	2565	+ goto out_mem;
	2566	+ }
	2567	+
	2568	+ proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd);
	2569	+ pkt_dbg(1, pd, "writer mapped to %pg\n", bdev);
	2570	+ return 0;
	2571	+
	2572	+out_mem:
	2573	+ blkdev_put(bdev, FMODE_READ \| FMODE_NDELAY);
	2574	+ /* This is safe: open() is still holding a reference. */
	2575	+ module_put(THIS_MODULE);
	2576	+ return -ENOMEM;
	2577	+}
	2578	+
	2579	+static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
	2580	+{
	2581	+ struct pktcdvd_device *pd = bdev->bd_disk->private_data;
	2582	+ int ret;
	2583	+
	2584	+ pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
	2585	+ cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
	2586	+
	2587	+ mutex_lock(&pktcdvd_mutex);
	2588	+ switch (cmd) {
	2589	+ case CDROMEJECT:
	2590	+ /*
	2591	+ * The door gets locked when the device is opened, so we
	2592	+ * have to unlock it or else the eject command fails.
	2593	+ */
	2594	+ if (pd->refcnt == 1)
	2595	+ pkt_lock_door(pd, 0);
	2596	+ fallthrough;
	2597	+ /*
	2598	+ * forward selected CDROM ioctls to CD-ROM, for UDF
	2599	+ */
	2600	+ case CDROMMULTISESSION:
	2601	+ case CDROMREADTOCENTRY:
	2602	+ case CDROM_LAST_WRITTEN:
	2603	+ case CDROM_SEND_PACKET:
	2604	+ case SCSI_IOCTL_SEND_COMMAND:
	2605	+ if (!bdev->bd_disk->fops->ioctl)
	2606	+ ret = -ENOTTY;
	2607	+ else
	2608	+ ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
	2609	+ break;
	2610	+ default:
	2611	+ pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
	2612	+ ret = -ENOTTY;
	2613	+ }
	2614	+ mutex_unlock(&pktcdvd_mutex);
	2615	+
	2616	+ return ret;
	2617	+}
	2618	+
	2619	+static unsigned int pkt_check_events(struct gendisk *disk,
	2620	+ unsigned int clearing)
	2621	+{
	2622	+ struct pktcdvd_device *pd = disk->private_data;
	2623	+ struct gendisk *attached_disk;
	2624	+
	2625	+ if (!pd)
	2626	+ return 0;
	2627	+ if (!pd->bdev)
	2628	+ return 0;
	2629	+ attached_disk = pd->bdev->bd_disk;
	2630	+ if (!attached_disk \|\| !attached_disk->fops->check_events)
	2631	+ return 0;
	2632	+ return attached_disk->fops->check_events(attached_disk, clearing);
	2633	+}
	2634	+
	2635	+static char pkt_devnode(struct gendisk disk, umode_t *mode)
	2636	+{
	2637	+ return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name);
	2638	+}
	2639	+
	2640	+static const struct block_device_operations pktcdvd_ops = {
	2641	+ .owner = THIS_MODULE,
	2642	+ .submit_bio = pkt_submit_bio,
	2643	+ .open = pkt_open,
	2644	+ .release = pkt_close,
	2645	+ .ioctl = pkt_ioctl,
	2646	+ .compat_ioctl = blkdev_compat_ptr_ioctl,
	2647	+ .check_events = pkt_check_events,
	2648	+ .devnode = pkt_devnode,
	2649	+};
	2650	+
	2651	+/*
	2652	+ * Set up mapping from pktcdvd device to CD-ROM device.
	2653	+ */
	2654	+static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
	2655	+{
	2656	+ int idx;
	2657	+ int ret = -ENOMEM;
	2658	+ struct pktcdvd_device *pd;
	2659	+ struct gendisk *disk;
	2660	+
	2661	+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	2662	+
	2663	+ for (idx = 0; idx < MAX_WRITERS; idx++)
	2664	+ if (!pkt_devs[idx])
	2665	+ break;
	2666	+ if (idx == MAX_WRITERS) {
	2667	+ pr_err("max %d writers supported\n", MAX_WRITERS);
	2668	+ ret = -EBUSY;
	2669	+ goto out_mutex;
	2670	+ }
	2671	+
	2672	+ pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
	2673	+ if (!pd)
	2674	+ goto out_mutex;
	2675	+
	2676	+ ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
	2677	+ sizeof(struct pkt_rb_node));
	2678	+ if (ret)
	2679	+ goto out_mem;
	2680	+
	2681	+ INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
	2682	+ INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
	2683	+ spin_lock_init(&pd->cdrw.active_list_lock);
	2684	+
	2685	+ spin_lock_init(&pd->lock);
	2686	+ spin_lock_init(&pd->iosched.lock);
	2687	+ bio_list_init(&pd->iosched.read_queue);
	2688	+ bio_list_init(&pd->iosched.write_queue);
	2689	+ sprintf(pd->name, DRIVER_NAME"%d", idx);
	2690	+ init_waitqueue_head(&pd->wqueue);
	2691	+ pd->bio_queue = RB_ROOT;
	2692	+
	2693	+ pd->write_congestion_on = write_congestion_on;
	2694	+ pd->write_congestion_off = write_congestion_off;
	2695	+
	2696	+ ret = -ENOMEM;
	2697	+ disk = blk_alloc_disk(NUMA_NO_NODE);
	2698	+ if (!disk)
	2699	+ goto out_mem;
	2700	+ pd->disk = disk;
	2701	+ disk->major = pktdev_major;
	2702	+ disk->first_minor = idx;
	2703	+ disk->minors = 1;
	2704	+ disk->fops = &pktcdvd_ops;
	2705	+ disk->flags = GENHD_FL_REMOVABLE \| GENHD_FL_NO_PART;
	2706	+ strcpy(disk->disk_name, pd->name);
	2707	+ disk->private_data = pd;
	2708	+
	2709	+ pd->pkt_dev = MKDEV(pktdev_major, idx);
	2710	+ ret = pkt_new_dev(pd, dev);
	2711	+ if (ret)
	2712	+ goto out_mem2;
	2713	+
	2714	+ /* inherit events of the host device */
	2715	+ disk->events = pd->bdev->bd_disk->events;
	2716	+
	2717	+ ret = add_disk(disk);
	2718	+ if (ret)
	2719	+ goto out_mem2;
	2720	+
	2721	+ pkt_sysfs_dev_new(pd);
	2722	+ pkt_debugfs_dev_new(pd);
	2723	+
	2724	+ pkt_devs[idx] = pd;
	2725	+ if (pkt_dev)
	2726	+ *pkt_dev = pd->pkt_dev;
	2727	+
	2728	+ mutex_unlock(&ctl_mutex);
	2729	+ return 0;
	2730	+
	2731	+out_mem2:
	2732	+ put_disk(disk);
	2733	+out_mem:
	2734	+ mempool_exit(&pd->rb_pool);
	2735	+ kfree(pd);
	2736	+out_mutex:
	2737	+ mutex_unlock(&ctl_mutex);
	2738	+ pr_err("setup of pktcdvd device failed\n");
	2739	+ return ret;
	2740	+}
	2741	+
	2742	+/*
	2743	+ * Tear down mapping from pktcdvd device to CD-ROM device.
	2744	+ */
	2745	+static int pkt_remove_dev(dev_t pkt_dev)
	2746	+{
	2747	+ struct pktcdvd_device *pd;
	2748	+ int idx;
	2749	+ int ret = 0;
	2750	+
	2751	+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	2752	+
	2753	+ for (idx = 0; idx < MAX_WRITERS; idx++) {
	2754	+ pd = pkt_devs[idx];
	2755	+ if (pd && (pd->pkt_dev == pkt_dev))
	2756	+ break;
	2757	+ }
	2758	+ if (idx == MAX_WRITERS) {
	2759	+ pr_debug("dev not setup\n");
	2760	+ ret = -ENXIO;
	2761	+ goto out;
	2762	+ }
	2763	+
	2764	+ if (pd->refcnt > 0) {
	2765	+ ret = -EBUSY;
	2766	+ goto out;
	2767	+ }
	2768	+ if (!IS_ERR(pd->cdrw.thread))
	2769	+ kthread_stop(pd->cdrw.thread);
	2770	+
	2771	+ pkt_devs[idx] = NULL;
	2772	+
	2773	+ pkt_debugfs_dev_remove(pd);
	2774	+ pkt_sysfs_dev_remove(pd);
	2775	+
	2776	+ blkdev_put(pd->bdev, FMODE_READ \| FMODE_NDELAY);
	2777	+
	2778	+ remove_proc_entry(pd->name, pkt_proc);
	2779	+ pkt_dbg(1, pd, "writer unmapped\n");
	2780	+
	2781	+ del_gendisk(pd->disk);
	2782	+ put_disk(pd->disk);
	2783	+
	2784	+ mempool_exit(&pd->rb_pool);
	2785	+ kfree(pd);
	2786	+
	2787	+ /* This is safe: open() is still holding a reference. */
	2788	+ module_put(THIS_MODULE);
	2789	+
	2790	+out:
	2791	+ mutex_unlock(&ctl_mutex);
	2792	+ return ret;
	2793	+}
	2794	+
	2795	+static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
	2796	+{
	2797	+ struct pktcdvd_device *pd;
	2798	+
	2799	+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	2800	+
	2801	+ pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
	2802	+ if (pd) {
	2803	+ ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
	2804	+ ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
	2805	+ } else {
	2806	+ ctrl_cmd->dev = 0;
	2807	+ ctrl_cmd->pkt_dev = 0;
	2808	+ }
	2809	+ ctrl_cmd->num_devices = MAX_WRITERS;
	2810	+
	2811	+ mutex_unlock(&ctl_mutex);
	2812	+}
	2813	+
	2814	+static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	2815	+{
	2816	+ void __user argp = (void __user )arg;
	2817	+ struct pkt_ctrl_command ctrl_cmd;
	2818	+ int ret = 0;
	2819	+ dev_t pkt_dev = 0;
	2820	+
	2821	+ if (cmd != PACKET_CTRL_CMD)
	2822	+ return -ENOTTY;
	2823	+
	2824	+ if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
	2825	+ return -EFAULT;
	2826	+
	2827	+ switch (ctrl_cmd.command) {
	2828	+ case PKT_CTRL_CMD_SETUP:
	2829	+ if (!capable(CAP_SYS_ADMIN))
	2830	+ return -EPERM;
	2831	+ ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
	2832	+ ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
	2833	+ break;
	2834	+ case PKT_CTRL_CMD_TEARDOWN:
	2835	+ if (!capable(CAP_SYS_ADMIN))
	2836	+ return -EPERM;
	2837	+ ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
	2838	+ break;
	2839	+ case PKT_CTRL_CMD_STATUS:
	2840	+ pkt_get_status(&ctrl_cmd);
	2841	+ break;
	2842	+ default:
	2843	+ return -ENOTTY;
	2844	+ }
	2845	+
	2846	+ if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
	2847	+ return -EFAULT;
	2848	+ return ret;
	2849	+}
	2850	+
	2851	+#ifdef CONFIG_COMPAT
	2852	+static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	2853	+{
	2854	+ return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
	2855	+}
	2856	+#endif
	2857	+
	2858	+static const struct file_operations pkt_ctl_fops = {
	2859	+ .open = nonseekable_open,
	2860	+ .unlocked_ioctl = pkt_ctl_ioctl,
	2861	+#ifdef CONFIG_COMPAT
	2862	+ .compat_ioctl = pkt_ctl_compat_ioctl,
	2863	+#endif
	2864	+ .owner = THIS_MODULE,
	2865	+ .llseek = no_llseek,
	2866	+};
	2867	+
	2868	+static struct miscdevice pkt_misc = {
	2869	+ .minor = MISC_DYNAMIC_MINOR,
	2870	+ .name = DRIVER_NAME,
	2871	+ .nodename = "pktcdvd/control",
	2872	+ .fops = &pkt_ctl_fops
	2873	+};
	2874	+
	2875	+static int __init pkt_init(void)
	2876	+{
	2877	+ int ret;
	2878	+
	2879	+ mutex_init(&ctl_mutex);
	2880	+
	2881	+ ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
	2882	+ sizeof(struct packet_stacked_data));
	2883	+ if (ret)
	2884	+ return ret;
	2885	+ ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
	2886	+ if (ret) {
	2887	+ mempool_exit(&psd_pool);
	2888	+ return ret;
	2889	+ }
	2890	+
	2891	+ ret = register_blkdev(pktdev_major, DRIVER_NAME);
	2892	+ if (ret < 0) {
	2893	+ pr_err("unable to register block device\n");
	2894	+ goto out2;
	2895	+ }
	2896	+ if (!pktdev_major)
	2897	+ pktdev_major = ret;
	2898	+
	2899	+ ret = pkt_sysfs_init();
	2900	+ if (ret)
	2901	+ goto out;
	2902	+
	2903	+ pkt_debugfs_init();
	2904	+
	2905	+ ret = misc_register(&pkt_misc);
	2906	+ if (ret) {
	2907	+ pr_err("unable to register misc device\n");
	2908	+ goto out_misc;
	2909	+ }
	2910	+
	2911	+ pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
	2912	+
	2913	+ return 0;
	2914	+
	2915	+out_misc:
	2916	+ pkt_debugfs_cleanup();
	2917	+ pkt_sysfs_cleanup();
	2918	+out:
	2919	+ unregister_blkdev(pktdev_major, DRIVER_NAME);
	2920	+out2:
	2921	+ mempool_exit(&psd_pool);
	2922	+ bioset_exit(&pkt_bio_set);
	2923	+ return ret;
	2924	+}
	2925	+
	2926	+static void __exit pkt_exit(void)
	2927	+{
	2928	+ remove_proc_entry("driver/"DRIVER_NAME, NULL);
	2929	+ misc_deregister(&pkt_misc);
	2930	+
	2931	+ pkt_debugfs_cleanup();
	2932	+ pkt_sysfs_cleanup();
	2933	+
	2934	+ unregister_blkdev(pktdev_major, DRIVER_NAME);
	2935	+ mempool_exit(&psd_pool);
	2936	+ bioset_exit(&pkt_bio_set);
	2937	+}
	2938	+
	2939	+MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
	2940	+MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
	2941	+MODULE_LICENSE("GPL");
	2942	+
	2943	+module_init(pkt_init);
	2944	+module_exit(pkt_exit);

include/linux/pktcdvd.h+197−0

@@ -0,0 +1,197 @@
	1	+/*
	2	+ * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
	3	+ * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
	4	+ *
	5	+ * May be copied or modified under the terms of the GNU General Public
	6	+ * License. See linux/COPYING for more information.
	7	+ *
	8	+ * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
	9	+ * DVD-RW devices.
	10	+ *
	11	+ */
	12	+#ifndef __PKTCDVD_H
	13	+#define __PKTCDVD_H
	14	+
	15	+#include <linux/blkdev.h>
	16	+#include <linux/completion.h>
	17	+#include <linux/cdrom.h>
	18	+#include <linux/kobject.h>
	19	+#include <linux/sysfs.h>
	20	+#include <linux/mempool.h>
	21	+#include <uapi/linux/pktcdvd.h>
	22	+
	23	+/* default bio write queue congestion marks */
	24	+#define PKT_WRITE_CONGESTION_ON 10000
	25	+#define PKT_WRITE_CONGESTION_OFF 9000
	26	+
	27	+
	28	+struct packet_settings
	29	+{
	30	+ __u32 size; /* packet size in (512 byte) sectors */
	31	+ __u8 fp; /* fixed packets */
	32	+ __u8 link_loss; /* the rest is specified
	33	+ * as per Mt Fuji */
	34	+ __u8 write_type;
	35	+ __u8 track_mode;
	36	+ __u8 block_mode;
	37	+};
	38	+
	39	+/*
	40	+ * Very crude stats for now
	41	+ */
	42	+struct packet_stats
	43	+{
	44	+ unsigned long pkt_started;
	45	+ unsigned long pkt_ended;
	46	+ unsigned long secs_w;
	47	+ unsigned long secs_rg;
	48	+ unsigned long secs_r;
	49	+};
	50	+
	51	+struct packet_cdrw
	52	+{
	53	+ struct list_head pkt_free_list;
	54	+ struct list_head pkt_active_list;
	55	+ spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
	56	+ struct task_struct *thread;
	57	+ atomic_t pending_bios;
	58	+};
	59	+
	60	+/*
	61	+ * Switch to high speed reading after reading this many kilobytes
	62	+ * with no interspersed writes.
	63	+ */
	64	+#define HI_SPEED_SWITCH 512
	65	+
	66	+struct packet_iosched
	67	+{
	68	+ atomic_t attention; /* Set to non-zero when queue processing is needed */
	69	+ int writing; /* Non-zero when writing, zero when reading */
	70	+ spinlock_t lock; /* Protecting read/write queue manipulations */
	71	+ struct bio_list read_queue;
	72	+ struct bio_list write_queue;
	73	+ sector_t last_write; /* The sector where the last write ended */
	74	+ int successive_reads;
	75	+};
	76	+
	77	+/*
	78	+ * 32 buffers of 2048 bytes
	79	+ */
	80	+#if (PAGE_SIZE % CD_FRAMESIZE) != 0
	81	+#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
	82	+#endif
	83	+#define PACKET_MAX_SIZE 128
	84	+#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
	85	+#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
	86	+
	87	+enum packet_data_state {
	88	+ PACKET_IDLE_STATE, /* Not used at the moment */
	89	+ PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
	90	+ /* we don't have to do as much */
	91	+ /* data gathering */
	92	+ PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
	93	+ PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
	94	+ PACKET_RECOVERY_STATE, /* Recover after read/write errors */
	95	+ PACKET_FINISHED_STATE, /* After write has finished */
	96	+
	97	+ PACKET_NUM_STATES /* Number of possible states */
	98	+};
	99	+
	100	+/*
	101	+ * Information needed for writing a single packet
	102	+ */
	103	+struct pktcdvd_device;
	104	+
	105	+struct packet_data
	106	+{
	107	+ struct list_head list;
	108	+
	109	+ spinlock_t lock; /* Lock protecting state transitions and */
	110	+ /* orig_bios list */
	111	+
	112	+ struct bio_list orig_bios; /* Original bios passed to pkt_make_request */
	113	+ /* that will be handled by this packet */
	114	+ int write_size; /* Total size of all bios in the orig_bios */
	115	+ /* list, measured in number of frames */
	116	+
	117	+ struct bio w_bio; / The bio we will send to the real CD */
	118	+ /* device once we have all data for the */
	119	+ /* packet we are going to write */
	120	+ sector_t sector; /* First sector in this packet */
	121	+ int frames; /* Number of frames in this packet */
	122	+
	123	+ enum packet_data_state state; /* Current state */
	124	+ atomic_t run_sm; /* Incremented whenever the state */
	125	+ /* machine needs to be run */
	126	+ long sleep_time; /* Set this to non-zero to make the state */
	127	+ /* machine run after this many jiffies. */
	128	+
	129	+ atomic_t io_wait; /* Number of pending IO operations */
	130	+ atomic_t io_errors; /* Number of read/write errors during IO */
	131	+
	132	+ struct bio r_bios[PACKET_MAX_SIZE]; / bios to use during data gathering */
	133	+ struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
	134	+
	135	+ int cache_valid; /* If non-zero, the data for the zone defined */
	136	+ /* by the sector variable is completely cached */
	137	+ /* in the pages[] vector. */
	138	+
	139	+ int id; /* ID number for debugging */
	140	+ struct pktcdvd_device *pd;
	141	+};
	142	+
	143	+struct pkt_rb_node {
	144	+ struct rb_node rb_node;
	145	+ struct bio *bio;
	146	+};
	147	+
	148	+struct packet_stacked_data
	149	+{
	150	+ struct bio bio; / Original read request bio */
	151	+ struct pktcdvd_device *pd;
	152	+};
	153	+#define PSD_POOL_SIZE 64
	154	+
	155	+struct pktcdvd_device
	156	+{
	157	+ struct block_device bdev; / dev attached */
	158	+ dev_t pkt_dev; /* our dev */
	159	+ char name[20];
	160	+ struct packet_settings settings;
	161	+ struct packet_stats stats;
	162	+ int refcnt; /* Open count */
	163	+ int write_speed; /* current write speed, kB/s */
	164	+ int read_speed; /* current read speed, kB/s */
	165	+ unsigned long offset; /* start offset */
	166	+ __u8 mode_offset; /* 0 / 8 */
	167	+ __u8 type;
	168	+ unsigned long flags;
	169	+ __u16 mmc3_profile;
	170	+ __u32 nwa; /* next writable address */
	171	+ __u32 lra; /* last recorded address */
	172	+ struct packet_cdrw cdrw;
	173	+ wait_queue_head_t wqueue;
	174	+
	175	+ spinlock_t lock; /* Serialize access to bio_queue */
	176	+ struct rb_root bio_queue; /* Work queue of bios we need to handle */
	177	+ int bio_queue_size; /* Number of nodes in bio_queue */
	178	+ bool congested; /* Someone is waiting for bio_queue_size
	179	+ * to drop. */
	180	+ sector_t current_sector; /* Keep track of where the elevator is */
	181	+ atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
	182	+ /* needs to be run. */
	183	+ mempool_t rb_pool; /* mempool for pkt_rb_node allocations */
	184	+
	185	+ struct packet_iosched iosched;
	186	+ struct gendisk *disk;
	187	+
	188	+ int write_congestion_off;
	189	+ int write_congestion_on;
	190	+
	191	+ struct device dev; / sysfs pktcdvd[0-7] dev */
	192	+
	193	+ struct dentry dfs_d_root; / debugfs: devname directory */
	194	+ struct dentry dfs_f_info; / debugfs: info file */
	195	+};
	196	+
	197	+#endif /* __PKTCDVD_H */

include/uapi/linux/pktcdvd.h+112−0

@@ -0,0 +1,112 @@
	1	+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
	2	+/*
	3	+ * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
	4	+ * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
	5	+ *
	6	+ * May be copied or modified under the terms of the GNU General Public
	7	+ * License. See linux/COPYING for more information.
	8	+ *
	9	+ * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
	10	+ * DVD-RW devices.
	11	+ *
	12	+ */
	13	+#ifndef _UAPI__PKTCDVD_H
	14	+#define _UAPI__PKTCDVD_H
	15	+
	16	+#include <linux/types.h>
	17	+
	18	+/*
	19	+ * 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
	20	+ */
	21	+#define PACKET_DEBUG 1
	22	+
	23	+#define MAX_WRITERS 8
	24	+
	25	+#define PKT_RB_POOL_SIZE 512
	26	+
	27	+/*
	28	+ * How long we should hold a non-full packet before starting data gathering.
	29	+ */
	30	+#define PACKET_WAIT_TIME (HZ * 5 / 1000)
	31	+
	32	+/*
	33	+ * use drive write caching -- we need deferred error handling to be
	34	+ * able to successfully recover with this option (drive will return good
	35	+ * status as soon as the cdb is validated).
	36	+ */
	37	+#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
	38	+#define USE_WCACHING 1
	39	+#else
	40	+#define USE_WCACHING 0
	41	+#endif
	42	+
	43	+/*
	44	+ * No user-servicable parts beyond this point ->
	45	+ */
	46	+
	47	+/*
	48	+ * device types
	49	+ */
	50	+#define PACKET_CDR 1
	51	+#define PACKET_CDRW 2
	52	+#define PACKET_DVDR 3
	53	+#define PACKET_DVDRW 4
	54	+
	55	+/*
	56	+ * flags
	57	+ */
	58	+#define PACKET_WRITABLE 1 /* pd is writable */
	59	+#define PACKET_NWA_VALID 2 /* next writable address valid */
	60	+#define PACKET_LRA_VALID 3 /* last recorded address valid */
	61	+#define PACKET_MERGE_SEGS 4 /* perform segment merging to keep */
	62	+ /* underlying cdrom device happy */
	63	+
	64	+/*
	65	+ * Disc status -- from READ_DISC_INFO
	66	+ */
	67	+#define PACKET_DISC_EMPTY 0
	68	+#define PACKET_DISC_INCOMPLETE 1
	69	+#define PACKET_DISC_COMPLETE 2
	70	+#define PACKET_DISC_OTHER 3
	71	+
	72	+/*
	73	+ * write type, and corresponding data block type
	74	+ */
	75	+#define PACKET_MODE1 1
	76	+#define PACKET_MODE2 2
	77	+#define PACKET_BLOCK_MODE1 8
	78	+#define PACKET_BLOCK_MODE2 10
	79	+
	80	+/*
	81	+ * Last session/border status
	82	+ */
	83	+#define PACKET_SESSION_EMPTY 0
	84	+#define PACKET_SESSION_INCOMPLETE 1
	85	+#define PACKET_SESSION_RESERVED 2
	86	+#define PACKET_SESSION_COMPLETE 3
	87	+
	88	+#define PACKET_MCN "4a656e734178626f65323030300000"
	89	+
	90	+#undef PACKET_USE_LS
	91	+
	92	+#define PKT_CTRL_CMD_SETUP 0
	93	+#define PKT_CTRL_CMD_TEARDOWN 1
	94	+#define PKT_CTRL_CMD_STATUS 2
	95	+
	96	+struct pkt_ctrl_command {
	97	+ __u32 command; /* in: Setup, teardown, status */
	98	+ __u32 dev_index; /* in/out: Device index */
	99	+ __u32 dev; /* in/out: Device nr for cdrw device */
	100	+ __u32 pkt_dev; /* in/out: Device nr for packet device */
	101	+ __u32 num_devices; /* out: Largest device index + 1 */
	102	+ __u32 padding; /* Not used */
	103	+};
	104	+
	105	+/*
	106	+ * packet ioctls
	107	+ */
	108	+#define PACKET_IOCTL_MAGIC ('X')
	109	+#define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
	110	+
	111	+
	112	+#endif /* _UAPI__PKTCDVD_H */