pktcdvd.c 72.6 KB
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/*
 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
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 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
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 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
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 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
 * DVD-RAM devices.
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 *
 * Theory of operation:
 *
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 * At the lowest level, there is the standard driver for the CD/DVD device,
 * typically ide-cd.c or sr.c. This driver can handle read and write requests,
 * but it doesn't know anything about the special restrictions that apply to
 * packet writing. One restriction is that write requests must be aligned to
 * packet boundaries on the physical media, and the size of a write request
 * must be equal to the packet size. Another restriction is that a
 * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
 * command, if the previous command was a write.
 *
 * The purpose of the packet writing driver is to hide these restrictions from
 * higher layers, such as file systems, and present a block device that can be
 * randomly read and written using 2kB-sized blocks.
 *
 * The lowest layer in the packet writing driver is the packet I/O scheduler.
 * Its data is defined by the struct packet_iosched and includes two bio
 * queues with pending read and write requests. These queues are processed
 * by the pkt_iosched_process_queue() function. The write requests in this
 * queue are already properly aligned and sized. This layer is responsible for
 * issuing the flush cache commands and scheduling the I/O in a good order.
 *
 * The next layer transforms unaligned write requests to aligned writes. This
 * transformation requires reading missing pieces of data from the underlying
 * block device, assembling the pieces to full packets and queuing them to the
 * packet I/O scheduler.
 *
 * At the top layer there is a custom make_request_fn function that forwards
 * read requests directly to the iosched queue and puts write requests in the
 * unaligned write queue. A kernel thread performs the necessary read
 * gathering to convert the unaligned writes to aligned writes and then feeds
 * them to the packet I/O scheduler.
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 *
 *************************************************************************/

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/pktcdvd.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
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#include <linux/compat.h>
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#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
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#include <linux/freezer.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/backing-dev.h>
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#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi.h>
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#include <linux/debugfs.h>
#include <linux/device.h>
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#include <linux/nospec.h>
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#include <linux/uaccess.h>
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#define DRIVER_NAME	"pktcdvd"

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#define pkt_err(pd, fmt, ...)						\
	pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
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#define pkt_notice(pd, fmt, ...)					\
	pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
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#define pkt_info(pd, fmt, ...)						\
	pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
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#define pkt_dbg(level, pd, fmt, ...)					\
do {									\
	if (level == 2 && PACKET_DEBUG >= 2)				\
		pr_notice("%s: %s():" fmt,				\
			  pd->name, __func__, ##__VA_ARGS__);		\
	else if (level == 1 && PACKET_DEBUG >= 1)			\
		pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__);		\
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} while (0)
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#define MAX_SPEED 0xffff

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static DEFINE_MUTEX(pktcdvd_mutex);
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static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
static struct proc_dir_entry *pkt_proc;
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static int pktdev_major;
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static int write_congestion_on  = PKT_WRITE_CONGESTION_ON;
static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
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static struct mutex ctl_mutex;	/* Serialize open/close/setup/teardown */
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static mempool_t psd_pool;
static struct bio_set pkt_bio_set;
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static struct class	*class_pktcdvd = NULL;    /* /sys/class/pktcdvd */
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static struct dentry	*pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
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/* forward declaration */
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
static int pkt_remove_dev(dev_t pkt_dev);
static int pkt_seq_show(struct seq_file *m, void *p);

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static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
{
	return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
}
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/*
 * create and register a pktcdvd kernel object.
 */
static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
					const char* name,
					struct kobject* parent,
					struct kobj_type* ktype)
{
	struct pktcdvd_kobj *p;
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	int error;

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	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return NULL;
	p->pd = pd;
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	error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
	if (error) {
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		kobject_put(&p->kobj);
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		return NULL;
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	}
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	kobject_uevent(&p->kobj, KOBJ_ADD);
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	return p;
}
/*
 * remove a pktcdvd kernel object.
 */
static void pkt_kobj_remove(struct pktcdvd_kobj *p)
{
	if (p)
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		kobject_put(&p->kobj);
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}
/*
 * default release function for pktcdvd kernel objects.
 */
static void pkt_kobj_release(struct kobject *kobj)
{
	kfree(to_pktcdvdkobj(kobj));
}


/**********************************************************
 *
 * sysfs interface for pktcdvd
 * by (C) 2006  Thomas Maier <balagi@justmail.de>
 *
 **********************************************************/

#define DEF_ATTR(_obj,_name,_mode) \
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	static struct attribute _obj = { .name = _name, .mode = _mode }
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/**********************************************************
  /sys/class/pktcdvd/pktcdvd[0-7]/
                     stat/reset
                     stat/packets_started
                     stat/packets_finished
                     stat/kb_written
                     stat/kb_read
                     stat/kb_read_gather
                     write_queue/size
                     write_queue/congestion_off
                     write_queue/congestion_on
 **********************************************************/

DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);

static struct attribute *kobj_pkt_attrs_stat[] = {
	&kobj_pkt_attr_st1,
	&kobj_pkt_attr_st2,
	&kobj_pkt_attr_st3,
	&kobj_pkt_attr_st4,
	&kobj_pkt_attr_st5,
	&kobj_pkt_attr_st6,
	NULL
};

DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on",  0644);

static struct attribute *kobj_pkt_attrs_wqueue[] = {
	&kobj_pkt_attr_wq1,
	&kobj_pkt_attr_wq2,
	&kobj_pkt_attr_wq3,
	NULL
};

static ssize_t kobj_pkt_show(struct kobject *kobj,
			struct attribute *attr, char *data)
{
	struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
	int n = 0;
	int v;
	if (strcmp(attr->name, "packets_started") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.pkt_started);

	} else if (strcmp(attr->name, "packets_finished") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.pkt_ended);

	} else if (strcmp(attr->name, "kb_written") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);

	} else if (strcmp(attr->name, "kb_read") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);

	} else if (strcmp(attr->name, "kb_read_gather") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);

	} else if (strcmp(attr->name, "size") == 0) {
		spin_lock(&pd->lock);
		v = pd->bio_queue_size;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);

	} else if (strcmp(attr->name, "congestion_off") == 0) {
		spin_lock(&pd->lock);
		v = pd->write_congestion_off;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);

	} else if (strcmp(attr->name, "congestion_on") == 0) {
		spin_lock(&pd->lock);
		v = pd->write_congestion_on;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);
	}
	return n;
}

static void init_write_congestion_marks(int* lo, int* hi)
{
	if (*hi > 0) {
		*hi = max(*hi, 500);
		*hi = min(*hi, 1000000);
		if (*lo <= 0)
			*lo = *hi - 100;
		else {
			*lo = min(*lo, *hi - 100);
			*lo = max(*lo, 100);
		}
	} else {
		*hi = -1;
		*lo = -1;
	}
}

static ssize_t kobj_pkt_store(struct kobject *kobj,
			struct attribute *attr,
			const char *data, size_t len)
{
	struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
	int val;

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	if (strcmp(attr->name, "reset") == 0 && len > 0) {
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		pd->stats.pkt_started = 0;
		pd->stats.pkt_ended = 0;
		pd->stats.secs_w = 0;
		pd->stats.secs_rg = 0;
		pd->stats.secs_r = 0;

	} else if (strcmp(attr->name, "congestion_off") == 0
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		   && sscanf(data, "%d", &val) == 1) {
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		spin_lock(&pd->lock);
		pd->write_congestion_off = val;
		init_write_congestion_marks(&pd->write_congestion_off,
					&pd->write_congestion_on);
		spin_unlock(&pd->lock);

	} else if (strcmp(attr->name, "congestion_on") == 0
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		   && sscanf(data, "%d", &val) == 1) {
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		spin_lock(&pd->lock);
		pd->write_congestion_on = val;
		init_write_congestion_marks(&pd->write_congestion_off,
					&pd->write_congestion_on);
		spin_unlock(&pd->lock);
	}
	return len;
}

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static const struct sysfs_ops kobj_pkt_ops = {
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	.show = kobj_pkt_show,
	.store = kobj_pkt_store
};
static struct kobj_type kobj_pkt_type_stat = {
	.release = pkt_kobj_release,
	.sysfs_ops = &kobj_pkt_ops,
	.default_attrs = kobj_pkt_attrs_stat
};
static struct kobj_type kobj_pkt_type_wqueue = {
	.release = pkt_kobj_release,
	.sysfs_ops = &kobj_pkt_ops,
	.default_attrs = kobj_pkt_attrs_wqueue
};

static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
{
	if (class_pktcdvd) {
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		pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,
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					"%s", pd->name);
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		if (IS_ERR(pd->dev))
			pd->dev = NULL;
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	}
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	if (pd->dev) {
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		pd->kobj_stat = pkt_kobj_create(pd, "stat",
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					&pd->dev->kobj,
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					&kobj_pkt_type_stat);
		pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
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					&pd->dev->kobj,
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					&kobj_pkt_type_wqueue);
	}
}

static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
{
	pkt_kobj_remove(pd->kobj_stat);
	pkt_kobj_remove(pd->kobj_wqueue);
	if (class_pktcdvd)
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		device_unregister(pd->dev);
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}


/********************************************************************
  /sys/class/pktcdvd/
                     add            map block device
                     remove         unmap packet dev
                     device_map     show mappings
 *******************************************************************/

static void class_pktcdvd_release(struct class *cls)
{
	kfree(cls);
}
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static ssize_t device_map_show(struct class *c, struct class_attribute *attr,
			       char *data)
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{
	int n = 0;
	int idx;
	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	for (idx = 0; idx < MAX_WRITERS; idx++) {
		struct pktcdvd_device *pd = pkt_devs[idx];
		if (!pd)
			continue;
		n += sprintf(data+n, "%s %u:%u %u:%u\n",
			pd->name,
			MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
			MAJOR(pd->bdev->bd_dev),
			MINOR(pd->bdev->bd_dev));
	}
	mutex_unlock(&ctl_mutex);
	return n;
}
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static CLASS_ATTR_RO(device_map);
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static ssize_t add_store(struct class *c, struct class_attribute *attr,
			 const char *buf, size_t count)
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{
	unsigned int major, minor;
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	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
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		/* pkt_setup_dev() expects caller to hold reference to self */
		if (!try_module_get(THIS_MODULE))
			return -ENODEV;

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		pkt_setup_dev(MKDEV(major, minor), NULL);
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		module_put(THIS_MODULE);

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		return count;
	}
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	return -EINVAL;
}
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static CLASS_ATTR_WO(add);
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static ssize_t remove_store(struct class *c, struct class_attribute *attr,
			    const char *buf, size_t count)
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{
	unsigned int major, minor;
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	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
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		pkt_remove_dev(MKDEV(major, minor));
		return count;
	}
	return -EINVAL;
}
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static CLASS_ATTR_WO(remove);
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static struct attribute *class_pktcdvd_attrs[] = {
	&class_attr_add.attr,
	&class_attr_remove.attr,
	&class_attr_device_map.attr,
	NULL,
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};
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ATTRIBUTE_GROUPS(class_pktcdvd);
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static int pkt_sysfs_init(void)
{
	int ret = 0;

	/*
	 * create control files in sysfs
	 * /sys/class/pktcdvd/...
	 */
	class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
	if (!class_pktcdvd)
		return -ENOMEM;
	class_pktcdvd->name = DRIVER_NAME;
	class_pktcdvd->owner = THIS_MODULE;
	class_pktcdvd->class_release = class_pktcdvd_release;
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	class_pktcdvd->class_groups = class_pktcdvd_groups;
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	ret = class_register(class_pktcdvd);
	if (ret) {
		kfree(class_pktcdvd);
		class_pktcdvd = NULL;
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		pr_err("failed to create class pktcdvd\n");
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		return ret;
	}
	return 0;
}

static void pkt_sysfs_cleanup(void)
{
	if (class_pktcdvd)
		class_destroy(class_pktcdvd);
	class_pktcdvd = NULL;
}

/********************************************************************
  entries in debugfs

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  /sys/kernel/debug/pktcdvd[0-7]/
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			info

 *******************************************************************/

static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
{
	return pkt_seq_show(m, p);
}

static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
{
	return single_open(file, pkt_debugfs_seq_show, inode->i_private);
}

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static const struct file_operations debug_fops = {
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	.open		= pkt_debugfs_fops_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.owner		= THIS_MODULE,
};

static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
{
	if (!pkt_debugfs_root)
		return;
	pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
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	if (!pd->dfs_d_root)
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		return;
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	pd->dfs_f_info = debugfs_create_file("info", 0444,
					     pd->dfs_d_root, pd, &debug_fops);
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}

static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
{
	if (!pkt_debugfs_root)
		return;
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	debugfs_remove(pd->dfs_f_info);
	debugfs_remove(pd->dfs_d_root);
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	pd->dfs_f_info = NULL;
	pd->dfs_d_root = NULL;
}

static void pkt_debugfs_init(void)
{
	pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
}

static void pkt_debugfs_cleanup(void)
{
	debugfs_remove(pkt_debugfs_root);
	pkt_debugfs_root = NULL;
}

/* ----------------------------------------------------------*/

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static void pkt_bio_finished(struct pktcdvd_device *pd)
{
	BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
	if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
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		pkt_dbg(2, pd, "queue empty\n");
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		atomic_set(&pd->iosched.attention, 1);
		wake_up(&pd->wqueue);
	}
}

/*
 * Allocate a packet_data struct
 */
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static struct packet_data *pkt_alloc_packet_data(int frames)
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{
	int i;
	struct packet_data *pkt;

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	pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
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	if (!pkt)
		goto no_pkt;

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	pkt->frames = frames;
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	pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
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	if (!pkt->w_bio)
		goto no_bio;

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	for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
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		pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
		if (!pkt->pages[i])
			goto no_page;
	}

	spin_lock_init(&pkt->lock);
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	bio_list_init(&pkt->orig_bios);
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	for (i = 0; i < frames; i++) {
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		struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
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		if (!bio)
			goto no_rd_bio;
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		pkt->r_bios[i] = bio;
	}

	return pkt;

no_rd_bio:
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	for (i = 0; i < frames; i++) {
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		struct bio *bio = pkt->r_bios[i];
		if (bio)
			bio_put(bio);
	}

no_page:
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	for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
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		if (pkt->pages[i])
			__free_page(pkt->pages[i]);
	bio_put(pkt->w_bio);
no_bio:
	kfree(pkt);
no_pkt:
	return NULL;
}

/*
 * Free a packet_data struct
 */
static void pkt_free_packet_data(struct packet_data *pkt)
{
	int i;

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	for (i = 0; i < pkt->frames; i++) {
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		struct bio *bio = pkt->r_bios[i];
		if (bio)
			bio_put(bio);
	}
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	for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
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		__free_page(pkt->pages[i]);
	bio_put(pkt->w_bio);
	kfree(pkt);
}

static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *next;

	BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));

	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
		pkt_free_packet_data(pkt);
	}
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	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
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}

static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
{
	struct packet_data *pkt;

607 608
	BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));

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609
	while (nr_packets > 0) {
610
		pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
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		if (!pkt) {
			pkt_shrink_pktlist(pd);
			return 0;
		}
		pkt->id = nr_packets;
		pkt->pd = pd;
		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
		nr_packets--;
	}
	return 1;
}

static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
{
	struct rb_node *n = rb_next(&node->rb_node);
	if (!n)
		return NULL;
	return rb_entry(n, struct pkt_rb_node, rb_node);
}

631
static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
L
Linus Torvalds 已提交
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{
	rb_erase(&node->rb_node, &pd->bio_queue);
634
	mempool_free(node, &pd->rb_pool);
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	pd->bio_queue_size--;
	BUG_ON(pd->bio_queue_size < 0);
}

/*
 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
 */
static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
{
	struct rb_node *n = pd->bio_queue.rb_node;
	struct rb_node *next;
	struct pkt_rb_node *tmp;

	if (!n) {
		BUG_ON(pd->bio_queue_size > 0);
		return NULL;
	}

	for (;;) {
		tmp = rb_entry(n, struct pkt_rb_node, rb_node);
655
		if (s <= tmp->bio->bi_iter.bi_sector)
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			next = n->rb_left;
		else
			next = n->rb_right;
		if (!next)
			break;
		n = next;
	}

664
	if (s > tmp->bio->bi_iter.bi_sector) {
L
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665 666 667 668
		tmp = pkt_rbtree_next(tmp);
		if (!tmp)
			return NULL;
	}
669
	BUG_ON(s > tmp->bio->bi_iter.bi_sector);
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	return tmp;
}

/*
 * Insert a node into the pd->bio_queue rb tree.
 */
static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
{
	struct rb_node **p = &pd->bio_queue.rb_node;
	struct rb_node *parent = NULL;
680
	sector_t s = node->bio->bi_iter.bi_sector;
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	struct pkt_rb_node *tmp;

	while (*p) {
		parent = *p;
		tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
686
		if (s < tmp->bio->bi_iter.bi_sector)
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			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}
	rb_link_node(&node->rb_node, parent, p);
	rb_insert_color(&node->rb_node, &pd->bio_queue);
	pd->bio_queue_size++;
}

/*
 * Send a packet_command to the underlying block device and
 * wait for completion.
 */
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
{
702
	struct request_queue *q = bdev_get_queue(pd->bdev);
L
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703
	struct request *rq;
704 705 706
	int ret = 0;

	rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
707
			     REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
708 709
	if (IS_ERR(rq))
		return PTR_ERR(rq);
710 711

	if (cgc->buflen) {
J
Julia Lawall 已提交
712
		ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
713
				      GFP_NOIO);
J
Julia Lawall 已提交
714
		if (ret)
715 716
			goto out;
	}
L
Linus Torvalds 已提交
717

718 719
	scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
	memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE);
L
Linus Torvalds 已提交
720 721 722

	rq->timeout = 60*HZ;
	if (cgc->quiet)
723
		rq->rq_flags |= RQF_QUIET;
L
Linus Torvalds 已提交
724

725
	blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
726
	if (scsi_req(rq)->result)
A
Andrew Morton 已提交
727
		ret = -EIO;
728
out:
L
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729
	blk_put_request(rq);
730
	return ret;
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}

733 734 735 736 737 738 739 740 741 742 743
static const char *sense_key_string(__u8 index)
{
	static const char * const info[] = {
		"No sense", "Recovered error", "Not ready",
		"Medium error", "Hardware error", "Illegal request",
		"Unit attention", "Data protect", "Blank check",
	};

	return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
}

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/*
 * A generic sense dump / resolve mechanism should be implemented across
 * all ATAPI + SCSI devices.
 */
748 749
static void pkt_dump_sense(struct pktcdvd_device *pd,
			   struct packet_command *cgc)
L
Linus Torvalds 已提交
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{
	struct request_sense *sense = cgc->sense;

753
	if (sense)
754 755 756 757
		pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
			CDROM_PACKET_SIZE, cgc->cmd,
			sense->sense_key, sense->asc, sense->ascq,
			sense_key_string(sense->sense_key));
758
	else
759
		pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
L
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}

/*
 * flush the drive cache to media
 */
static int pkt_flush_cache(struct pktcdvd_device *pd)
{
	struct packet_command cgc;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
	cgc.quiet = 1;

	/*
	 * the IMMED bit -- we default to not setting it, although that
	 * would allow a much faster close, this is safer
	 */
#if 0
	cgc.cmd[1] = 1 << 1;
#endif
	return pkt_generic_packet(pd, &cgc);
}

/*
 * speed is given as the normal factor, e.g. 4 for 4x
 */
786 787
static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
				unsigned write_speed, unsigned read_speed)
L
Linus Torvalds 已提交
788 789 790 791 792 793 794 795 796 797 798 799 800
{
	struct packet_command cgc;
	struct request_sense sense;
	int ret;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_SET_SPEED;
	cgc.cmd[2] = (read_speed >> 8) & 0xff;
	cgc.cmd[3] = read_speed & 0xff;
	cgc.cmd[4] = (write_speed >> 8) & 0xff;
	cgc.cmd[5] = write_speed & 0xff;

801 802
	ret = pkt_generic_packet(pd, &cgc);
	if (ret)
803
		pkt_dump_sense(pd, &cgc);
L
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804 805 806 807 808 809 810 811

	return ret;
}

/*
 * Queue a bio for processing by the low-level CD device. Must be called
 * from process context.
 */
812
static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
L
Linus Torvalds 已提交
813 814
{
	spin_lock(&pd->iosched.lock);
815 816 817 818
	if (bio_data_dir(bio) == READ)
		bio_list_add(&pd->iosched.read_queue, bio);
	else
		bio_list_add(&pd->iosched.write_queue, bio);
L
Linus Torvalds 已提交
819 820 821 822 823 824 825 826 827 828 829
	spin_unlock(&pd->iosched.lock);

	atomic_set(&pd->iosched.attention, 1);
	wake_up(&pd->wqueue);
}

/*
 * Process the queued read/write requests. This function handles special
 * requirements for CDRW drives:
 * - A cache flush command must be inserted before a read request if the
 *   previous request was a write.
830
 * - Switching between reading and writing is slow, so don't do it more often
L
Linus Torvalds 已提交
831
 *   than necessary.
832 833 834 835
 * - Optimize for throughput at the expense of latency. This means that streaming
 *   writes will never be interrupted by a read, but if the drive has to seek
 *   before the next write, switch to reading instead if there are any pending
 *   read requests.
L
Linus Torvalds 已提交
836 837 838 839 840 841 842 843 844 845 846 847 848 849
 * - Set the read speed according to current usage pattern. When only reading
 *   from the device, it's best to use the highest possible read speed, but
 *   when switching often between reading and writing, it's better to have the
 *   same read and write speeds.
 */
static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
{

	if (atomic_read(&pd->iosched.attention) == 0)
		return;
	atomic_set(&pd->iosched.attention, 0);

	for (;;) {
		struct bio *bio;
850
		int reads_queued, writes_queued;
L
Linus Torvalds 已提交
851 852

		spin_lock(&pd->iosched.lock);
853 854
		reads_queued = !bio_list_empty(&pd->iosched.read_queue);
		writes_queued = !bio_list_empty(&pd->iosched.write_queue);
L
Linus Torvalds 已提交
855 856 857 858 859 860
		spin_unlock(&pd->iosched.lock);

		if (!reads_queued && !writes_queued)
			break;

		if (pd->iosched.writing) {
861 862
			int need_write_seek = 1;
			spin_lock(&pd->iosched.lock);
863
			bio = bio_list_peek(&pd->iosched.write_queue);
864
			spin_unlock(&pd->iosched.lock);
865 866
			if (bio && (bio->bi_iter.bi_sector ==
				    pd->iosched.last_write))
867 868
				need_write_seek = 0;
			if (need_write_seek && reads_queued) {
L
Linus Torvalds 已提交
869
				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
870
					pkt_dbg(2, pd, "write, waiting\n");
L
Linus Torvalds 已提交
871 872 873 874 875 876 877 878
					break;
				}
				pkt_flush_cache(pd);
				pd->iosched.writing = 0;
			}
		} else {
			if (!reads_queued && writes_queued) {
				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
879
					pkt_dbg(2, pd, "read, waiting\n");
L
Linus Torvalds 已提交
880 881 882 883 884 885 886
					break;
				}
				pd->iosched.writing = 1;
			}
		}

		spin_lock(&pd->iosched.lock);
887 888 889 890
		if (pd->iosched.writing)
			bio = bio_list_pop(&pd->iosched.write_queue);
		else
			bio = bio_list_pop(&pd->iosched.read_queue);
L
Linus Torvalds 已提交
891 892 893 894 895 896
		spin_unlock(&pd->iosched.lock);

		if (!bio)
			continue;

		if (bio_data_dir(bio) == READ)
897 898
			pd->iosched.successive_reads +=
				bio->bi_iter.bi_size >> 10;
899
		else {
L
Linus Torvalds 已提交
900
			pd->iosched.successive_reads = 0;
K
Kent Overstreet 已提交
901
			pd->iosched.last_write = bio_end_sector(bio);
902
		}
L
Linus Torvalds 已提交
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
		if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
			if (pd->read_speed == pd->write_speed) {
				pd->read_speed = MAX_SPEED;
				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
			}
		} else {
			if (pd->read_speed != pd->write_speed) {
				pd->read_speed = pd->write_speed;
				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
			}
		}

		atomic_inc(&pd->cdrw.pending_bios);
		generic_make_request(bio);
	}
}

/*
 * Special care is needed if the underlying block device has a small
 * max_phys_segments value.
 */
924
static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
L
Linus Torvalds 已提交
925
{
926
	if ((pd->settings.size << 9) / CD_FRAMESIZE
927
	    <= queue_max_segments(q)) {
L
Linus Torvalds 已提交
928 929 930 931 932
		/*
		 * The cdrom device can handle one segment/frame
		 */
		clear_bit(PACKET_MERGE_SEGS, &pd->flags);
		return 0;
933
	} else if ((pd->settings.size << 9) / PAGE_SIZE
934
		   <= queue_max_segments(q)) {
L
Linus Torvalds 已提交
935 936 937 938 939 940 941
		/*
		 * We can handle this case at the expense of some extra memory
		 * copies during write operations
		 */
		set_bit(PACKET_MERGE_SEGS, &pd->flags);
		return 0;
	} else {
942
		pkt_err(pd, "cdrom max_phys_segments too small\n");
L
Linus Torvalds 已提交
943 944 945 946
		return -EIO;
	}
}

947
static void pkt_end_io_read(struct bio *bio)
L
Linus Torvalds 已提交
948 949 950 951 952
{
	struct packet_data *pkt = bio->bi_private;
	struct pktcdvd_device *pd = pkt->pd;
	BUG_ON(!pd);

953
	pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
954
		bio, (unsigned long long)pkt->sector,
955
		(unsigned long long)bio->bi_iter.bi_sector, bio->bi_status);
L
Linus Torvalds 已提交
956

957
	if (bio->bi_status)
L
Linus Torvalds 已提交
958 959 960 961 962 963 964 965
		atomic_inc(&pkt->io_errors);
	if (atomic_dec_and_test(&pkt->io_wait)) {
		atomic_inc(&pkt->run_sm);
		wake_up(&pd->wqueue);
	}
	pkt_bio_finished(pd);
}

966
static void pkt_end_io_packet_write(struct bio *bio)
L
Linus Torvalds 已提交
967 968 969 970 971
{
	struct packet_data *pkt = bio->bi_private;
	struct pktcdvd_device *pd = pkt->pd;
	BUG_ON(!pd);

972
	pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status);
L
Linus Torvalds 已提交
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991

	pd->stats.pkt_ended++;

	pkt_bio_finished(pd);
	atomic_dec(&pkt->io_wait);
	atomic_inc(&pkt->run_sm);
	wake_up(&pd->wqueue);
}

/*
 * Schedule reads for the holes in a packet
 */
static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	int frames_read = 0;
	struct bio *bio;
	int f;
	char written[PACKET_MAX_SIZE];

992
	BUG_ON(bio_list_empty(&pkt->orig_bios));
L
Linus Torvalds 已提交
993 994 995 996 997 998 999 1000 1001

	atomic_set(&pkt->io_wait, 0);
	atomic_set(&pkt->io_errors, 0);

	/*
	 * Figure out which frames we need to read before we can write.
	 */
	memset(written, 0, sizeof(written));
	spin_lock(&pkt->lock);
1002
	bio_list_for_each(bio, &pkt->orig_bios) {
1003 1004 1005
		int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
			(CD_FRAMESIZE >> 9);
		int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
1006
		pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
L
Linus Torvalds 已提交
1007 1008 1009 1010 1011 1012 1013
		BUG_ON(first_frame < 0);
		BUG_ON(first_frame + num_frames > pkt->frames);
		for (f = first_frame; f < first_frame + num_frames; f++)
			written[f] = 1;
	}
	spin_unlock(&pkt->lock);

1014
	if (pkt->cache_valid) {
1015
		pkt_dbg(2, pd, "zone %llx cached\n",
1016 1017 1018 1019
			(unsigned long long)pkt->sector);
		goto out_account;
	}

L
Linus Torvalds 已提交
1020 1021 1022 1023 1024
	/*
	 * Schedule reads for missing parts of the packet.
	 */
	for (f = 0; f < pkt->frames; f++) {
		int p, offset;
1025

L
Linus Torvalds 已提交
1026 1027
		if (written[f])
			continue;
1028

L
Linus Torvalds 已提交
1029
		bio = pkt->r_bios[f];
1030
		bio_reset(bio);
1031
		bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1032
		bio_set_dev(bio, pd->bdev);
L
Linus Torvalds 已提交
1033 1034 1035 1036 1037
		bio->bi_end_io = pkt_end_io_read;
		bio->bi_private = pkt;

		p = (f * CD_FRAMESIZE) / PAGE_SIZE;
		offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1038
		pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
L
Linus Torvalds 已提交
1039 1040 1041 1042 1043
			f, pkt->pages[p], offset);
		if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
			BUG();

		atomic_inc(&pkt->io_wait);
1044
		bio_set_op_attrs(bio, REQ_OP_READ, 0);
1045
		pkt_queue_bio(pd, bio);
L
Linus Torvalds 已提交
1046 1047 1048 1049
		frames_read++;
	}

out_account:
1050
	pkt_dbg(2, pd, "need %d frames for zone %llx\n",
L
Linus Torvalds 已提交
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
		frames_read, (unsigned long long)pkt->sector);
	pd->stats.pkt_started++;
	pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
}

/*
 * Find a packet matching zone, or the least recently used packet if
 * there is no match.
 */
static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
{
	struct packet_data *pkt;

	list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
		if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
			list_del_init(&pkt->list);
			if (pkt->sector != zone)
				pkt->cache_valid = 0;
1069
			return pkt;
L
Linus Torvalds 已提交
1070 1071
		}
	}
1072 1073
	BUG();
	return NULL;
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
}

static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	if (pkt->cache_valid) {
		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
	} else {
		list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
	}
}

/*
 * recover a failed write, query for relocation if possible
 *
 * returns 1 if recovery is possible, or 0 if not
 *
 */
static int pkt_start_recovery(struct packet_data *pkt)
{
	/*
	 * FIXME. We need help from the file system to implement
	 * recovery handling.
	 */
	return 0;
#if 0
	struct request *rq = pkt->rq;
	struct pktcdvd_device *pd = rq->rq_disk->private_data;
	struct block_device *pkt_bdev;
	struct super_block *sb = NULL;
	unsigned long old_block, new_block;
	sector_t new_sector;

	pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
	if (pkt_bdev) {
		sb = get_super(pkt_bdev);
		bdput(pkt_bdev);
	}

	if (!sb)
		return 0;

1115
	if (!sb->s_op->relocate_blocks)
L
Linus Torvalds 已提交
1116 1117 1118 1119 1120 1121 1122 1123 1124
		goto out;

	old_block = pkt->sector / (CD_FRAMESIZE >> 9);
	if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
		goto out;

	new_sector = new_block * (CD_FRAMESIZE >> 9);
	pkt->sector = new_sector;

1125
	bio_reset(pkt->bio);
J
Jiufei Xue 已提交
1126
	bio_set_dev(pkt->bio, pd->bdev);
J
Jens Axboe 已提交
1127
	bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0);
1128 1129
	pkt->bio->bi_iter.bi_sector = new_sector;
	pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;
1130
	pkt->bio->bi_vcnt = pkt->frames;
L
Linus Torvalds 已提交
1131

1132 1133
	pkt->bio->bi_end_io = pkt_end_io_packet_write;
	pkt->bio->bi_private = pkt;
L
Linus Torvalds 已提交
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150

	drop_super(sb);
	return 1;

out:
	drop_super(sb);
	return 0;
#endif
}

static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
{
#if PACKET_DEBUG > 1
	static const char *state_name[] = {
		"IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
	};
	enum packet_data_state old_state = pkt->state;
1151
	pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
1152
		pkt->id, (unsigned long long)pkt->sector,
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		state_name[old_state], state_name[state]);
#endif
	pkt->state = state;
}

/*
 * Scan the work queue to see if we can start a new packet.
 * returns non-zero if any work was done.
 */
static int pkt_handle_queue(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *p;
	struct bio *bio = NULL;
	sector_t zone = 0; /* Suppress gcc warning */
	struct pkt_rb_node *node, *first_node;
	struct rb_node *n;
1169
	int wakeup;
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	atomic_set(&pd->scan_queue, 0);

	if (list_empty(&pd->cdrw.pkt_free_list)) {
1174
		pkt_dbg(2, pd, "no pkt\n");
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		return 0;
	}

	/*
	 * Try to find a zone we are not already working on.
	 */
	spin_lock(&pd->lock);
	first_node = pkt_rbtree_find(pd, pd->current_sector);
	if (!first_node) {
		n = rb_first(&pd->bio_queue);
		if (n)
			first_node = rb_entry(n, struct pkt_rb_node, rb_node);
	}
	node = first_node;
	while (node) {
		bio = node->bio;
1191
		zone = get_zone(bio->bi_iter.bi_sector, pd);
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		list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1193 1194
			if (p->sector == zone) {
				bio = NULL;
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				goto try_next_bio;
1196
			}
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		}
		break;
try_next_bio:
		node = pkt_rbtree_next(node);
		if (!node) {
			n = rb_first(&pd->bio_queue);
			if (n)
				node = rb_entry(n, struct pkt_rb_node, rb_node);
		}
		if (node == first_node)
			node = NULL;
	}
	spin_unlock(&pd->lock);
	if (!bio) {
1211
		pkt_dbg(2, pd, "no bio\n");
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		return 0;
	}

	pkt = pkt_get_packet_data(pd, zone);

	pd->current_sector = zone + pd->settings.size;
	pkt->sector = zone;
1219
	BUG_ON(pkt->frames != pd->settings.size >> 2);
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	pkt->write_size = 0;

	/*
	 * Scan work queue for bios in the same zone and link them
	 * to this packet.
	 */
	spin_lock(&pd->lock);
1227
	pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
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	while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
		bio = node->bio;
1230 1231 1232
		pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
			get_zone(bio->bi_iter.bi_sector, pd));
		if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
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			break;
		pkt_rbtree_erase(pd, node);
		spin_lock(&pkt->lock);
1236
		bio_list_add(&pkt->orig_bios, bio);
1237
		pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
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		spin_unlock(&pkt->lock);
	}
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	/* check write congestion marks, and if bio_queue_size is
	   below, wake up any waiters */
	wakeup = (pd->write_congestion_on > 0
	 		&& pd->bio_queue_size <= pd->write_congestion_off);
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	spin_unlock(&pd->lock);
1245
	if (wakeup) {
1246
		clear_bdi_congested(pd->disk->queue->backing_dev_info,
1247 1248
					BLK_RW_ASYNC);
	}
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	pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
	pkt_set_state(pkt, PACKET_WAITING_STATE);
	atomic_set(&pkt->run_sm, 1);

	spin_lock(&pd->cdrw.active_list_lock);
	list_add(&pkt->list, &pd->cdrw.pkt_active_list);
	spin_unlock(&pd->cdrw.active_list_lock);

	return 1;
}

/*
 * Assemble a bio to write one packet and queue the bio for processing
 * by the underlying block device.
 */
static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	int f;

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	bio_reset(pkt->w_bio);
1270
	pkt->w_bio->bi_iter.bi_sector = pkt->sector;
1271
	bio_set_dev(pkt->w_bio, pd->bdev);
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	pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
	pkt->w_bio->bi_private = pkt;

	/* XXX: locking? */
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	for (f = 0; f < pkt->frames; f++) {
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		struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
		unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;

		if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
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			BUG();
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	}
1283
	pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
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	/*
1286
	 * Fill-in bvec with data from orig_bios.
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	 */
	spin_lock(&pkt->lock);
1289
	bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
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	pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
	spin_unlock(&pkt->lock);

1294
	pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
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		pkt->write_size, (unsigned long long)pkt->sector);
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1297
	if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
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		pkt->cache_valid = 1;
1299
	else
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		pkt->cache_valid = 0;

	/* Start the write request */
	atomic_set(&pkt->io_wait, 1);
1304
	bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0);
1305
	pkt_queue_bio(pd, pkt->w_bio);
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}

1308
static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
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{
1310
	struct bio *bio;
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1312
	if (status)
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		pkt->cache_valid = 0;

	/* Finish all bios corresponding to this packet */
1316
	while ((bio = bio_list_pop(&pkt->orig_bios))) {
1317
		bio->bi_status = status;
1318 1319
		bio_endio(bio);
	}
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}

static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
{
1324
	pkt_dbg(2, pd, "pkt %d\n", pkt->id);
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	for (;;) {
		switch (pkt->state) {
		case PACKET_WAITING_STATE:
			if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
				return;

			pkt->sleep_time = 0;
			pkt_gather_data(pd, pkt);
			pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
			break;

		case PACKET_READ_WAIT_STATE:
			if (atomic_read(&pkt->io_wait) > 0)
				return;

			if (atomic_read(&pkt->io_errors) > 0) {
				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
			} else {
				pkt_start_write(pd, pkt);
			}
			break;

		case PACKET_WRITE_WAIT_STATE:
			if (atomic_read(&pkt->io_wait) > 0)
				return;

1352
			if (!pkt->w_bio->bi_status) {
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				pkt_set_state(pkt, PACKET_FINISHED_STATE);
			} else {
				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
			}
			break;

		case PACKET_RECOVERY_STATE:
			if (pkt_start_recovery(pkt)) {
				pkt_start_write(pd, pkt);
			} else {
1363
				pkt_dbg(2, pd, "No recovery possible\n");
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				pkt_set_state(pkt, PACKET_FINISHED_STATE);
			}
			break;

		case PACKET_FINISHED_STATE:
1369
			pkt_finish_packet(pkt, pkt->w_bio->bi_status);
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			return;

		default:
			BUG();
			break;
		}
	}
}

static void pkt_handle_packets(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *next;

	/*
	 * Run state machine for active packets
	 */
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		if (atomic_read(&pkt->run_sm) > 0) {
			atomic_set(&pkt->run_sm, 0);
			pkt_run_state_machine(pd, pkt);
		}
	}

	/*
	 * Move no longer active packets to the free list
	 */
	spin_lock(&pd->cdrw.active_list_lock);
	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
		if (pkt->state == PACKET_FINISHED_STATE) {
			list_del(&pkt->list);
			pkt_put_packet_data(pd, pkt);
			pkt_set_state(pkt, PACKET_IDLE_STATE);
			atomic_set(&pd->scan_queue, 1);
		}
	}
	spin_unlock(&pd->cdrw.active_list_lock);
}

static void pkt_count_states(struct pktcdvd_device *pd, int *states)
{
	struct packet_data *pkt;
	int i;

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	for (i = 0; i < PACKET_NUM_STATES; i++)
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		states[i] = 0;

	spin_lock(&pd->cdrw.active_list_lock);
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		states[pkt->state]++;
	}
	spin_unlock(&pd->cdrw.active_list_lock);
}

/*
 * kcdrwd is woken up when writes have been queued for one of our
 * registered devices
 */
static int kcdrwd(void *foobar)
{
	struct pktcdvd_device *pd = foobar;
	struct packet_data *pkt;
	long min_sleep_time, residue;

1433
	set_user_nice(current, MIN_NICE);
1434
	set_freezable();
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	for (;;) {
		DECLARE_WAITQUEUE(wait, current);

		/*
		 * Wait until there is something to do
		 */
		add_wait_queue(&pd->wqueue, &wait);
		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);

			/* Check if we need to run pkt_handle_queue */
			if (atomic_read(&pd->scan_queue) > 0)
				goto work_to_do;

			/* Check if we need to run the state machine for some packet */
			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (atomic_read(&pkt->run_sm) > 0)
					goto work_to_do;
			}

			/* Check if we need to process the iosched queues */
			if (atomic_read(&pd->iosched.attention) != 0)
				goto work_to_do;

			/* Otherwise, go to sleep */
			if (PACKET_DEBUG > 1) {
				int states[PACKET_NUM_STATES];
				pkt_count_states(pd, states);
1464
				pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1465 1466
					states[0], states[1], states[2],
					states[3], states[4], states[5]);
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			}

			min_sleep_time = MAX_SCHEDULE_TIMEOUT;
			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
					min_sleep_time = pkt->sleep_time;
			}

1475
			pkt_dbg(2, pd, "sleeping\n");
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			residue = schedule_timeout(min_sleep_time);
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			pkt_dbg(2, pd, "wake up\n");
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			/* make swsusp happy with our thread */
1480
			try_to_freeze();
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			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (!pkt->sleep_time)
					continue;
				pkt->sleep_time -= min_sleep_time - residue;
				if (pkt->sleep_time <= 0) {
					pkt->sleep_time = 0;
					atomic_inc(&pkt->run_sm);
				}
			}

			if (kthread_should_stop())
				break;
		}
work_to_do:
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&pd->wqueue, &wait);

		if (kthread_should_stop())
			break;

		/*
		 * if pkt_handle_queue returns true, we can queue
		 * another request.
		 */
		while (pkt_handle_queue(pd))
			;

		/*
		 * Handle packet state machine
		 */
		pkt_handle_packets(pd);

		/*
		 * Handle iosched queues
		 */
		pkt_iosched_process_queue(pd);
	}

	return 0;
}

static void pkt_print_settings(struct pktcdvd_device *pd)
{
1525 1526 1527 1528
	pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
		 pd->settings.fp ? "Fixed" : "Variable",
		 pd->settings.size >> 2,
		 pd->settings.block_mode == 8 ? '1' : '2');
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}

static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
{
	memset(cgc->cmd, 0, sizeof(cgc->cmd));

	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
	cgc->cmd[2] = page_code | (page_control << 6);
	cgc->cmd[7] = cgc->buflen >> 8;
	cgc->cmd[8] = cgc->buflen & 0xff;
	cgc->data_direction = CGC_DATA_READ;
	return pkt_generic_packet(pd, cgc);
}

static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
{
	memset(cgc->cmd, 0, sizeof(cgc->cmd));
	memset(cgc->buffer, 0, 2);
	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
	cgc->cmd[1] = 0x10;		/* PF */
	cgc->cmd[7] = cgc->buflen >> 8;
	cgc->cmd[8] = cgc->buflen & 0xff;
	cgc->data_direction = CGC_DATA_WRITE;
	return pkt_generic_packet(pd, cgc);
}

static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
{
	struct packet_command cgc;
	int ret;

	/* set up command and get the disc info */
	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
	cgc.cmd[8] = cgc.buflen = 2;
	cgc.quiet = 1;

1566 1567
	ret = pkt_generic_packet(pd, &cgc);
	if (ret)
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		return ret;

	/* not all drives have the same disc_info length, so requeue
	 * packet with the length the drive tells us it can supply
	 */
	cgc.buflen = be16_to_cpu(di->disc_information_length) +
		     sizeof(di->disc_information_length);

	if (cgc.buflen > sizeof(disc_information))
		cgc.buflen = sizeof(disc_information);

	cgc.cmd[8] = cgc.buflen;
	return pkt_generic_packet(pd, &cgc);
}

static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
{
	struct packet_command cgc;
	int ret;

	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
	cgc.cmd[1] = type & 3;
	cgc.cmd[4] = (track & 0xff00) >> 8;
	cgc.cmd[5] = track & 0xff;
	cgc.cmd[8] = 8;
	cgc.quiet = 1;

1596 1597
	ret = pkt_generic_packet(pd, &cgc);
	if (ret)
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		return ret;

	cgc.buflen = be16_to_cpu(ti->track_information_length) +
		     sizeof(ti->track_information_length);

	if (cgc.buflen > sizeof(track_information))
		cgc.buflen = sizeof(track_information);

	cgc.cmd[8] = cgc.buflen;
	return pkt_generic_packet(pd, &cgc);
}

1610 1611
static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
						long *last_written)
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{
	disc_information di;
	track_information ti;
	__u32 last_track;
	int ret = -1;

1618 1619
	ret = pkt_get_disc_info(pd, &di);
	if (ret)
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		return ret;

	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1623 1624
	ret = pkt_get_track_info(pd, last_track, 1, &ti);
	if (ret)
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		return ret;

	/* if this track is blank, try the previous. */
	if (ti.blank) {
		last_track--;
1630 1631
		ret = pkt_get_track_info(pd, last_track, 1, &ti);
		if (ret)
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			return ret;
	}

	/* if last recorded field is valid, return it. */
	if (ti.lra_v) {
		*last_written = be32_to_cpu(ti.last_rec_address);
	} else {
		/* make it up instead */
		*last_written = be32_to_cpu(ti.track_start) +
				be32_to_cpu(ti.track_size);
		if (ti.free_blocks)
			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
	}
	return 0;
}

/*
 * write mode select package based on pd->settings
 */
1651
static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
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{
	struct packet_command cgc;
	struct request_sense sense;
	write_param_page *wp;
	char buffer[128];
	int ret, size;

	/* doesn't apply to DVD+RW or DVD-RAM */
	if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
		return 0;

	memset(buffer, 0, sizeof(buffer));
	init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
	cgc.sense = &sense;
1666 1667
	ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
	if (ret) {
1668
		pkt_dump_sense(pd, &cgc);
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		return ret;
	}

	size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
	pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
	if (size > sizeof(buffer))
		size = sizeof(buffer);

	/*
	 * now get it all
	 */
	init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
	cgc.sense = &sense;
1682 1683
	ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
	if (ret) {
1684
		pkt_dump_sense(pd, &cgc);
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		return ret;
	}

	/*
	 * write page is offset header + block descriptor length
	 */
	wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];

	wp->fp = pd->settings.fp;
	wp->track_mode = pd->settings.track_mode;
	wp->write_type = pd->settings.write_type;
	wp->data_block_type = pd->settings.block_mode;

	wp->multi_session = 0;

#ifdef PACKET_USE_LS
	wp->link_size = 7;
	wp->ls_v = 1;
#endif

	if (wp->data_block_type == PACKET_BLOCK_MODE1) {
		wp->session_format = 0;
		wp->subhdr2 = 0x20;
	} else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
		wp->session_format = 0x20;
		wp->subhdr2 = 8;
#if 0
		wp->mcn[0] = 0x80;
		memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
#endif
	} else {
		/*
		 * paranoia
		 */
1719
		pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
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		return 1;
	}
	wp->packet_size = cpu_to_be32(pd->settings.size >> 2);

	cgc.buflen = cgc.cmd[8] = size;
1725 1726
	ret = pkt_mode_select(pd, &cgc);
	if (ret) {
1727
		pkt_dump_sense(pd, &cgc);
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		return ret;
	}

	pkt_print_settings(pd);
	return 0;
}

/*
1736
 * 1 -- we can write to this track, 0 -- we can't
L
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 */
1738
static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
L
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{
1740 1741 1742 1743 1744 1745 1746 1747
	switch (pd->mmc3_profile) {
		case 0x1a: /* DVD+RW */
		case 0x12: /* DVD-RAM */
			/* The track is always writable on DVD+RW/DVD-RAM */
			return 1;
		default:
			break;
	}
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1748

1749 1750
	if (!ti->packet || !ti->fp)
		return 0;
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1751 1752 1753 1754

	/*
	 * "good" settings as per Mt Fuji.
	 */
1755
	if (ti->rt == 0 && ti->blank == 0)
1756
		return 1;
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1757

1758
	if (ti->rt == 0 && ti->blank == 1)
1759
		return 1;
L
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1760

1761
	if (ti->rt == 1 && ti->blank == 0)
1762
		return 1;
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1763

1764
	pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1765
	return 0;
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}

/*
1769
 * 1 -- we can write to this disc, 0 -- we can't
L
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 */
1771
static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
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{
	switch (pd->mmc3_profile) {
		case 0x0a: /* CD-RW */
		case 0xffff: /* MMC3 not supported */
			break;
		case 0x1a: /* DVD+RW */
		case 0x13: /* DVD-RW */
		case 0x12: /* DVD-RAM */
1780
			return 1;
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		default:
1782
			pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
1783
				pd->mmc3_profile);
1784
			return 0;
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	}

	/*
	 * for disc type 0xff we should probably reserve a new track.
	 * but i'm not sure, should we leave this to user apps? probably.
	 */
	if (di->disc_type == 0xff) {
1792
		pkt_notice(pd, "unknown disc - no track?\n");
1793
		return 0;
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	}

	if (di->disc_type != 0x20 && di->disc_type != 0) {
1797
		pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
1798
		return 0;
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	}

	if (di->erasable == 0) {
1802
		pkt_notice(pd, "disc not erasable\n");
1803
		return 0;
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	}

	if (di->border_status == PACKET_SESSION_RESERVED) {
1807
		pkt_err(pd, "can't write to last track (reserved)\n");
1808
		return 0;
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1809 1810
	}

1811
	return 1;
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}

1814
static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
L
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1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
{
	struct packet_command cgc;
	unsigned char buf[12];
	disc_information di;
	track_information ti;
	int ret, track;

	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
	cgc.cmd[8] = 8;
	ret = pkt_generic_packet(pd, &cgc);
	pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];

	memset(&di, 0, sizeof(disc_information));
	memset(&ti, 0, sizeof(track_information));

1831 1832
	ret = pkt_get_disc_info(pd, &di);
	if (ret) {
1833
		pkt_err(pd, "failed get_disc\n");
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		return ret;
	}

1837
	if (!pkt_writable_disc(pd, &di))
1838
		return -EROFS;
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1839 1840 1841 1842

	pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;

	track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1843 1844
	ret = pkt_get_track_info(pd, track, 1, &ti);
	if (ret) {
1845
		pkt_err(pd, "failed get_track\n");
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1846 1847 1848
		return ret;
	}

1849
	if (!pkt_writable_track(pd, &ti)) {
1850
		pkt_err(pd, "can't write to this track\n");
1851
		return -EROFS;
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	}

	/*
	 * we keep packet size in 512 byte units, makes it easier to
	 * deal with request calculations.
	 */
	pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
	if (pd->settings.size == 0) {
1860
		pkt_notice(pd, "detected zero packet size!\n");
1861
		return -ENXIO;
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1862
	}
1863
	if (pd->settings.size > PACKET_MAX_SECTORS) {
1864
		pkt_err(pd, "packet size is too big\n");
1865
		return -EROFS;
1866
	}
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1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
	pd->settings.fp = ti.fp;
	pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);

	if (ti.nwa_v) {
		pd->nwa = be32_to_cpu(ti.next_writable);
		set_bit(PACKET_NWA_VALID, &pd->flags);
	}

	/*
	 * in theory we could use lra on -RW media as well and just zero
	 * blocks that haven't been written yet, but in practice that
	 * is just a no-go. we'll use that for -R, naturally.
	 */
	if (ti.lra_v) {
		pd->lra = be32_to_cpu(ti.last_rec_address);
		set_bit(PACKET_LRA_VALID, &pd->flags);
	} else {
		pd->lra = 0xffffffff;
		set_bit(PACKET_LRA_VALID, &pd->flags);
	}

	/*
	 * fine for now
	 */
	pd->settings.link_loss = 7;
	pd->settings.write_type = 0;	/* packet */
	pd->settings.track_mode = ti.track_mode;

	/*
	 * mode1 or mode2 disc
	 */
	switch (ti.data_mode) {
		case PACKET_MODE1:
			pd->settings.block_mode = PACKET_BLOCK_MODE1;
			break;
		case PACKET_MODE2:
			pd->settings.block_mode = PACKET_BLOCK_MODE2;
			break;
		default:
1906
			pkt_err(pd, "unknown data mode\n");
1907
			return -EROFS;
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	}
	return 0;
}

/*
 * enable/disable write caching on drive
 */
1915 1916
static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
						int set)
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{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[64];
	int ret;

	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.buflen = pd->mode_offset + 12;

	/*
	 * caching mode page might not be there, so quiet this command
	 */
	cgc.quiet = 1;

1932 1933
	ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
	if (ret)
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1934 1935 1936 1937 1938 1939 1940
		return ret;

	buf[pd->mode_offset + 10] |= (!!set << 2);

	cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
	ret = pkt_mode_select(pd, &cgc);
	if (ret) {
1941
		pkt_err(pd, "write caching control failed\n");
1942
		pkt_dump_sense(pd, &cgc);
L
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1943
	} else if (!ret && set)
1944
		pkt_notice(pd, "enabled write caching\n");
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1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
	return ret;
}

static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
{
	struct packet_command cgc;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
	cgc.cmd[4] = lockflag ? 1 : 0;
	return pkt_generic_packet(pd, &cgc);
}

/*
 * Returns drive maximum write speed
 */
1961 1962
static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
						unsigned *write_speed)
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1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[256+18];
	unsigned char *cap_buf;
	int ret, offset;

	cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
	cgc.sense = &sense;

	ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
	if (ret) {
		cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
			     sizeof(struct mode_page_header);
		ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
		if (ret) {
1980
			pkt_dump_sense(pd, &cgc);
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1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
			return ret;
		}
	}

	offset = 20;			    /* Obsoleted field, used by older drives */
	if (cap_buf[1] >= 28)
		offset = 28;		    /* Current write speed selected */
	if (cap_buf[1] >= 30) {
		/* If the drive reports at least one "Logical Unit Write
		 * Speed Performance Descriptor Block", use the information
		 * in the first block. (contains the highest speed)
		 */
		int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
		if (num_spdb > 0)
			offset = 34;
	}

	*write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
	return 0;
}

/* These tables from cdrecord - I don't have orange book */
/* standard speed CD-RW (1-4x) */
static char clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* high speed CD-RW (-10x) */
static char hs_clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* ultra high speed CD-RW */
static char us_clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
};

/*
 * reads the maximum media speed from ATIP
 */
2022 2023
static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
						unsigned *speed)
L
Linus Torvalds 已提交
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[64];
	unsigned int size, st, sp;
	int ret;

	init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	cgc.cmd[1] = 2;
	cgc.cmd[2] = 4; /* READ ATIP */
	cgc.cmd[8] = 2;
	ret = pkt_generic_packet(pd, &cgc);
	if (ret) {
2039
		pkt_dump_sense(pd, &cgc);
L
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2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
		return ret;
	}
	size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
	if (size > sizeof(buf))
		size = sizeof(buf);

	init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	cgc.cmd[1] = 2;
	cgc.cmd[2] = 4;
	cgc.cmd[8] = size;
	ret = pkt_generic_packet(pd, &cgc);
	if (ret) {
2054
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
2055 2056 2057
		return ret;
	}

2058
	if (!(buf[6] & 0x40)) {
2059
		pkt_notice(pd, "disc type is not CD-RW\n");
L
Linus Torvalds 已提交
2060 2061
		return 1;
	}
2062
	if (!(buf[6] & 0x4)) {
2063
		pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
L
Linus Torvalds 已提交
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
		return 1;
	}

	st = (buf[6] >> 3) & 0x7; /* disc sub-type */

	sp = buf[16] & 0xf; /* max speed from ATIP A1 field */

	/* Info from cdrecord */
	switch (st) {
		case 0: /* standard speed */
			*speed = clv_to_speed[sp];
			break;
		case 1: /* high speed */
			*speed = hs_clv_to_speed[sp];
			break;
		case 2: /* ultra high speed */
			*speed = us_clv_to_speed[sp];
			break;
		default:
2083
			pkt_notice(pd, "unknown disc sub-type %d\n", st);
L
Linus Torvalds 已提交
2084 2085 2086
			return 1;
	}
	if (*speed) {
2087
		pkt_info(pd, "maximum media speed: %d\n", *speed);
L
Linus Torvalds 已提交
2088 2089
		return 0;
	} else {
2090
		pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
L
Linus Torvalds 已提交
2091 2092 2093 2094
		return 1;
	}
}

2095
static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
L
Linus Torvalds 已提交
2096 2097 2098 2099 2100
{
	struct packet_command cgc;
	struct request_sense sense;
	int ret;

2101
	pkt_dbg(2, pd, "Performing OPC\n");
L
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2102 2103 2104 2105 2106 2107

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.sense = &sense;
	cgc.timeout = 60*HZ;
	cgc.cmd[0] = GPCMD_SEND_OPC;
	cgc.cmd[1] = 1;
2108 2109
	ret = pkt_generic_packet(pd, &cgc);
	if (ret)
2110
		pkt_dump_sense(pd, &cgc);
L
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2111 2112 2113 2114 2115 2116 2117 2118
	return ret;
}

static int pkt_open_write(struct pktcdvd_device *pd)
{
	int ret;
	unsigned int write_speed, media_write_speed, read_speed;

2119 2120
	ret = pkt_probe_settings(pd);
	if (ret) {
2121
		pkt_dbg(2, pd, "failed probe\n");
2122
		return ret;
L
Linus Torvalds 已提交
2123 2124
	}

2125 2126
	ret = pkt_set_write_settings(pd);
	if (ret) {
2127
		pkt_dbg(1, pd, "failed saving write settings\n");
L
Linus Torvalds 已提交
2128 2129 2130 2131 2132
		return -EIO;
	}

	pkt_write_caching(pd, USE_WCACHING);

2133 2134
	ret = pkt_get_max_speed(pd, &write_speed);
	if (ret)
L
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2135 2136 2137 2138 2139
		write_speed = 16 * 177;
	switch (pd->mmc3_profile) {
		case 0x13: /* DVD-RW */
		case 0x1a: /* DVD+RW */
		case 0x12: /* DVD-RAM */
2140
			pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
L
Linus Torvalds 已提交
2141 2142
			break;
		default:
2143 2144
			ret = pkt_media_speed(pd, &media_write_speed);
			if (ret)
L
Linus Torvalds 已提交
2145 2146
				media_write_speed = 16;
			write_speed = min(write_speed, media_write_speed * 177);
2147
			pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
L
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2148 2149 2150 2151
			break;
	}
	read_speed = write_speed;

2152 2153
	ret = pkt_set_speed(pd, write_speed, read_speed);
	if (ret) {
2154
		pkt_dbg(1, pd, "couldn't set write speed\n");
L
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2155 2156 2157 2158 2159
		return -EIO;
	}
	pd->write_speed = write_speed;
	pd->read_speed = read_speed;

2160 2161
	ret = pkt_perform_opc(pd);
	if (ret) {
2162
		pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
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2163 2164 2165 2166 2167 2168 2169 2170
	}

	return 0;
}

/*
 * called at open time.
 */
2171
static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
L
Linus Torvalds 已提交
2172 2173 2174
{
	int ret;
	long lba;
2175
	struct request_queue *q;
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2176 2177 2178 2179 2180 2181 2182

	/*
	 * We need to re-open the cdrom device without O_NONBLOCK to be able
	 * to read/write from/to it. It is already opened in O_NONBLOCK mode
	 * so bdget() can't fail.
	 */
	bdget(pd->bdev->bd_dev);
2183 2184
	ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd);
	if (ret)
L
Linus Torvalds 已提交
2185 2186
		goto out;

2187 2188
	ret = pkt_get_last_written(pd, &lba);
	if (ret) {
2189
		pkt_err(pd, "pkt_get_last_written failed\n");
2190
		goto out_putdev;
L
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2191 2192 2193 2194 2195 2196 2197 2198
	}

	set_capacity(pd->disk, lba << 2);
	set_capacity(pd->bdev->bd_disk, lba << 2);
	bd_set_size(pd->bdev, (loff_t)lba << 11);

	q = bdev_get_queue(pd->bdev);
	if (write) {
2199 2200
		ret = pkt_open_write(pd);
		if (ret)
2201
			goto out_putdev;
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2202 2203 2204 2205 2206
		/*
		 * Some CDRW drives can not handle writes larger than one packet,
		 * even if the size is a multiple of the packet size.
		 */
		spin_lock_irq(q->queue_lock);
2207
		blk_queue_max_hw_sectors(q, pd->settings.size);
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2208 2209 2210 2211 2212 2213 2214
		spin_unlock_irq(q->queue_lock);
		set_bit(PACKET_WRITABLE, &pd->flags);
	} else {
		pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
		clear_bit(PACKET_WRITABLE, &pd->flags);
	}

2215 2216
	ret = pkt_set_segment_merging(pd, q);
	if (ret)
2217
		goto out_putdev;
L
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2218

2219 2220
	if (write) {
		if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2221
			pkt_err(pd, "not enough memory for buffers\n");
2222
			ret = -ENOMEM;
2223
			goto out_putdev;
2224
		}
2225
		pkt_info(pd, "%lukB available on disc\n", lba << 1);
2226
	}
L
Linus Torvalds 已提交
2227 2228 2229 2230

	return 0;

out_putdev:
2231
	blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
L
Linus Torvalds 已提交
2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
out:
	return ret;
}

/*
 * called when the device is closed. makes sure that the device flushes
 * the internal cache before we close.
 */
static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
{
	if (flush && pkt_flush_cache(pd))
2243
		pkt_dbg(1, pd, "not flushing cache\n");
L
Linus Torvalds 已提交
2244 2245 2246 2247

	pkt_lock_door(pd, 0);

	pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2248
	blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
2249 2250

	pkt_shrink_pktlist(pd);
L
Linus Torvalds 已提交
2251 2252
}

2253
static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
L
Linus Torvalds 已提交
2254 2255 2256
{
	if (dev_minor >= MAX_WRITERS)
		return NULL;
2257 2258

	dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
L
Linus Torvalds 已提交
2259 2260 2261
	return pkt_devs[dev_minor];
}

A
Al Viro 已提交
2262
static int pkt_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
2263 2264 2265 2266
{
	struct pktcdvd_device *pd = NULL;
	int ret;

2267
	mutex_lock(&pktcdvd_mutex);
2268
	mutex_lock(&ctl_mutex);
A
Al Viro 已提交
2269
	pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
L
Linus Torvalds 已提交
2270 2271 2272 2273 2274 2275 2276
	if (!pd) {
		ret = -ENODEV;
		goto out;
	}
	BUG_ON(pd->refcnt < 0);

	pd->refcnt++;
2277
	if (pd->refcnt > 1) {
A
Al Viro 已提交
2278
		if ((mode & FMODE_WRITE) &&
2279 2280 2281 2282 2283
		    !test_bit(PACKET_WRITABLE, &pd->flags)) {
			ret = -EBUSY;
			goto out_dec;
		}
	} else {
A
Al Viro 已提交
2284
		ret = pkt_open_dev(pd, mode & FMODE_WRITE);
2285
		if (ret)
L
Linus Torvalds 已提交
2286 2287 2288 2289 2290
			goto out_dec;
		/*
		 * needed here as well, since ext2 (among others) may change
		 * the blocksize at mount time
		 */
A
Al Viro 已提交
2291
		set_blocksize(bdev, CD_FRAMESIZE);
L
Linus Torvalds 已提交
2292 2293
	}

2294
	mutex_unlock(&ctl_mutex);
2295
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2296 2297 2298 2299 2300
	return 0;

out_dec:
	pd->refcnt--;
out:
2301
	mutex_unlock(&ctl_mutex);
2302
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2303 2304 2305
	return ret;
}

2306
static void pkt_close(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
2307
{
A
Al Viro 已提交
2308
	struct pktcdvd_device *pd = disk->private_data;
L
Linus Torvalds 已提交
2309

2310
	mutex_lock(&pktcdvd_mutex);
2311
	mutex_lock(&ctl_mutex);
L
Linus Torvalds 已提交
2312 2313 2314 2315 2316 2317
	pd->refcnt--;
	BUG_ON(pd->refcnt < 0);
	if (pd->refcnt == 0) {
		int flush = test_bit(PACKET_WRITABLE, &pd->flags);
		pkt_release_dev(pd, flush);
	}
2318
	mutex_unlock(&ctl_mutex);
2319
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2320 2321 2322
}


2323
static void pkt_end_io_read_cloned(struct bio *bio)
L
Linus Torvalds 已提交
2324 2325 2326 2327
{
	struct packet_stacked_data *psd = bio->bi_private;
	struct pktcdvd_device *pd = psd->pd;

2328
	psd->bio->bi_status = bio->bi_status;
L
Linus Torvalds 已提交
2329
	bio_put(bio);
2330
	bio_endio(psd->bio);
2331
	mempool_free(psd, &psd_pool);
L
Linus Torvalds 已提交
2332 2333 2334
	pkt_bio_finished(pd);
}

K
Kent Overstreet 已提交
2335
static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
L
Linus Torvalds 已提交
2336
{
2337 2338
	struct bio *cloned_bio = bio_clone_fast(bio, GFP_NOIO, &pkt_bio_set);
	struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
K
Kent Overstreet 已提交
2339 2340 2341

	psd->pd = pd;
	psd->bio = bio;
2342
	bio_set_dev(cloned_bio, pd->bdev);
K
Kent Overstreet 已提交
2343 2344 2345 2346 2347 2348 2349 2350 2351
	cloned_bio->bi_private = psd;
	cloned_bio->bi_end_io = pkt_end_io_read_cloned;
	pd->stats.secs_r += bio_sectors(bio);
	pkt_queue_bio(pd, cloned_bio);
}

static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
{
	struct pktcdvd_device *pd = q->queuedata;
L
Linus Torvalds 已提交
2352 2353 2354 2355 2356
	sector_t zone;
	struct packet_data *pkt;
	int was_empty, blocked_bio;
	struct pkt_rb_node *node;

2357
	zone = get_zone(bio->bi_iter.bi_sector, pd);
L
Linus Torvalds 已提交
2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369

	/*
	 * If we find a matching packet in state WAITING or READ_WAIT, we can
	 * just append this bio to that packet.
	 */
	spin_lock(&pd->cdrw.active_list_lock);
	blocked_bio = 0;
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		if (pkt->sector == zone) {
			spin_lock(&pkt->lock);
			if ((pkt->state == PACKET_WAITING_STATE) ||
			    (pkt->state == PACKET_READ_WAIT_STATE)) {
2370
				bio_list_add(&pkt->orig_bios, bio);
2371 2372
				pkt->write_size +=
					bio->bi_iter.bi_size / CD_FRAMESIZE;
L
Linus Torvalds 已提交
2373 2374 2375 2376 2377 2378 2379
				if ((pkt->write_size >= pkt->frames) &&
				    (pkt->state == PACKET_WAITING_STATE)) {
					atomic_inc(&pkt->run_sm);
					wake_up(&pd->wqueue);
				}
				spin_unlock(&pkt->lock);
				spin_unlock(&pd->cdrw.active_list_lock);
2380
				return;
L
Linus Torvalds 已提交
2381 2382 2383 2384 2385 2386 2387 2388
			} else {
				blocked_bio = 1;
			}
			spin_unlock(&pkt->lock);
		}
	}
	spin_unlock(&pd->cdrw.active_list_lock);

2389 2390 2391 2392 2393 2394 2395 2396
 	/*
	 * Test if there is enough room left in the bio work queue
	 * (queue size >= congestion on mark).
	 * If not, wait till the work queue size is below the congestion off mark.
	 */
	spin_lock(&pd->lock);
	if (pd->write_congestion_on > 0
	    && pd->bio_queue_size >= pd->write_congestion_on) {
2397
		set_bdi_congested(q->backing_dev_info, BLK_RW_ASYNC);
2398 2399
		do {
			spin_unlock(&pd->lock);
2400
			congestion_wait(BLK_RW_ASYNC, HZ);
2401 2402 2403 2404 2405
			spin_lock(&pd->lock);
		} while(pd->bio_queue_size > pd->write_congestion_off);
	}
	spin_unlock(&pd->lock);

L
Linus Torvalds 已提交
2406 2407 2408
	/*
	 * No matching packet found. Store the bio in the work queue.
	 */
2409
	node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
L
Linus Torvalds 已提交
2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
	node->bio = bio;
	spin_lock(&pd->lock);
	BUG_ON(pd->bio_queue_size < 0);
	was_empty = (pd->bio_queue_size == 0);
	pkt_rbtree_insert(pd, node);
	spin_unlock(&pd->lock);

	/*
	 * Wake up the worker thread.
	 */
	atomic_set(&pd->scan_queue, 1);
	if (was_empty) {
		/* This wake_up is required for correct operation */
		wake_up(&pd->wqueue);
	} else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
		/*
		 * This wake up is not required for correct operation,
		 * but improves performance in some cases.
		 */
		wake_up(&pd->wqueue);
	}
K
Kent Overstreet 已提交
2431 2432
}

2433
static blk_qc_t pkt_make_request(struct request_queue *q, struct bio *bio)
K
Kent Overstreet 已提交
2434 2435 2436 2437 2438
{
	struct pktcdvd_device *pd;
	char b[BDEVNAME_SIZE];
	struct bio *split;

2439
	blk_queue_split(q, &bio);
2440

K
Kent Overstreet 已提交
2441 2442
	pd = q->queuedata;
	if (!pd) {
2443
		pr_err("%s incorrect request queue\n", bio_devname(bio, b));
K
Kent Overstreet 已提交
2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455
		goto end_io;
	}

	pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
		(unsigned long long)bio->bi_iter.bi_sector,
		(unsigned long long)bio_end_sector(bio));

	/*
	 * Clone READ bios so we can have our own bi_end_io callback.
	 */
	if (bio_data_dir(bio) == READ) {
		pkt_make_request_read(pd, bio);
2456
		return BLK_QC_T_NONE;
K
Kent Overstreet 已提交
2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
	}

	if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
		pkt_notice(pd, "WRITE for ro device (%llu)\n",
			   (unsigned long long)bio->bi_iter.bi_sector);
		goto end_io;
	}

	if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
		pkt_err(pd, "wrong bio size\n");
		goto end_io;
	}

	do {
		sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
		sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);

		if (last_zone != zone) {
			BUG_ON(last_zone != zone + pd->settings.size);

			split = bio_split(bio, last_zone -
					  bio->bi_iter.bi_sector,
2479
					  GFP_NOIO, &pkt_bio_set);
K
Kent Overstreet 已提交
2480 2481 2482 2483 2484 2485 2486 2487
			bio_chain(split, bio);
		} else {
			split = bio;
		}

		pkt_make_request_write(q, split);
	} while (split != bio);

2488
	return BLK_QC_T_NONE;
L
Linus Torvalds 已提交
2489
end_io:
2490
	bio_io_error(bio);
2491
	return BLK_QC_T_NONE;
L
Linus Torvalds 已提交
2492 2493 2494 2495
}

static void pkt_init_queue(struct pktcdvd_device *pd)
{
2496
	struct request_queue *q = pd->disk->queue;
L
Linus Torvalds 已提交
2497 2498

	blk_queue_make_request(q, pkt_make_request);
2499
	blk_queue_logical_block_size(q, CD_FRAMESIZE);
2500
	blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
L
Linus Torvalds 已提交
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559
	q->queuedata = pd;
}

static int pkt_seq_show(struct seq_file *m, void *p)
{
	struct pktcdvd_device *pd = m->private;
	char *msg;
	char bdev_buf[BDEVNAME_SIZE];
	int states[PACKET_NUM_STATES];

	seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
		   bdevname(pd->bdev, bdev_buf));

	seq_printf(m, "\nSettings:\n");
	seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);

	if (pd->settings.write_type == 0)
		msg = "Packet";
	else
		msg = "Unknown";
	seq_printf(m, "\twrite type:\t\t%s\n", msg);

	seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
	seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);

	seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);

	if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
		msg = "Mode 1";
	else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
		msg = "Mode 2";
	else
		msg = "Unknown";
	seq_printf(m, "\tblock mode:\t\t%s\n", msg);

	seq_printf(m, "\nStatistics:\n");
	seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
	seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
	seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
	seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
	seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);

	seq_printf(m, "\nMisc:\n");
	seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
	seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
	seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
	seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
	seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
	seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);

	seq_printf(m, "\nQueue state:\n");
	seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
	seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
	seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);

	pkt_count_states(pd, states);
	seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
		   states[0], states[1], states[2], states[3], states[4], states[5]);

2560 2561 2562
	seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
			pd->write_congestion_off,
			pd->write_congestion_on);
L
Linus Torvalds 已提交
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573
	return 0;
}

static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
{
	int i;
	int ret = 0;
	char b[BDEVNAME_SIZE];
	struct block_device *bdev;

	if (pd->pkt_dev == dev) {
2574
		pkt_err(pd, "recursive setup not allowed\n");
L
Linus Torvalds 已提交
2575 2576 2577 2578 2579 2580 2581
		return -EBUSY;
	}
	for (i = 0; i < MAX_WRITERS; i++) {
		struct pktcdvd_device *pd2 = pkt_devs[i];
		if (!pd2)
			continue;
		if (pd2->bdev->bd_dev == dev) {
2582 2583
			pkt_err(pd, "%s already setup\n",
				bdevname(pd2->bdev, b));
L
Linus Torvalds 已提交
2584 2585 2586
			return -EBUSY;
		}
		if (pd2->pkt_dev == dev) {
2587
			pkt_err(pd, "can't chain pktcdvd devices\n");
L
Linus Torvalds 已提交
2588 2589 2590 2591 2592 2593 2594
			return -EBUSY;
		}
	}

	bdev = bdget(dev);
	if (!bdev)
		return -ENOMEM;
2595 2596 2597
	ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
	if (ret)
		return ret;
2598 2599
	if (!blk_queue_scsi_passthrough(bdev_get_queue(bdev))) {
		WARN_ONCE(true, "Attempt to register a non-SCSI queue\n");
2600
		blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
2601 2602
		return -EINVAL;
	}
L
Linus Torvalds 已提交
2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614

	/* This is safe, since we have a reference from open(). */
	__module_get(THIS_MODULE);

	pd->bdev = bdev;
	set_blocksize(bdev, CD_FRAMESIZE);

	pkt_init_queue(pd);

	atomic_set(&pd->cdrw.pending_bios, 0);
	pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
	if (IS_ERR(pd->cdrw.thread)) {
2615
		pkt_err(pd, "can't start kernel thread\n");
L
Linus Torvalds 已提交
2616
		ret = -ENOMEM;
2617
		goto out_mem;
L
Linus Torvalds 已提交
2618 2619
	}

2620
	proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd);
2621
	pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b));
L
Linus Torvalds 已提交
2622 2623 2624
	return 0;

out_mem:
2625
	blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
L
Linus Torvalds 已提交
2626 2627 2628 2629 2630
	/* This is safe: open() is still holding a reference. */
	module_put(THIS_MODULE);
	return ret;
}

A
Al Viro 已提交
2631
static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
2632
{
A
Al Viro 已提交
2633
	struct pktcdvd_device *pd = bdev->bd_disk->private_data;
2634
	int ret;
L
Linus Torvalds 已提交
2635

2636
	pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
2637
		cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
L
Linus Torvalds 已提交
2638

2639
	mutex_lock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2640
	switch (cmd) {
2641 2642 2643 2644 2645 2646 2647 2648
	case CDROMEJECT:
		/*
		 * The door gets locked when the device is opened, so we
		 * have to unlock it or else the eject command fails.
		 */
		if (pd->refcnt == 1)
			pkt_lock_door(pd, 0);
		/* fallthru */
L
Linus Torvalds 已提交
2649 2650 2651 2652 2653 2654 2655 2656
	/*
	 * forward selected CDROM ioctls to CD-ROM, for UDF
	 */
	case CDROMMULTISESSION:
	case CDROMREADTOCENTRY:
	case CDROM_LAST_WRITTEN:
	case CDROM_SEND_PACKET:
	case SCSI_IOCTL_SEND_COMMAND:
2657 2658
		ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
		break;
L
Linus Torvalds 已提交
2659 2660

	default:
2661
		pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
2662
		ret = -ENOTTY;
L
Linus Torvalds 已提交
2663
	}
2664
	mutex_unlock(&pktcdvd_mutex);
2665

2666
	return ret;
L
Linus Torvalds 已提交
2667 2668
}

2669 2670
static unsigned int pkt_check_events(struct gendisk *disk,
				     unsigned int clearing)
L
Linus Torvalds 已提交
2671 2672 2673 2674 2675 2676 2677 2678 2679
{
	struct pktcdvd_device *pd = disk->private_data;
	struct gendisk *attached_disk;

	if (!pd)
		return 0;
	if (!pd->bdev)
		return 0;
	attached_disk = pd->bdev->bd_disk;
2680
	if (!attached_disk || !attached_disk->fops->check_events)
L
Linus Torvalds 已提交
2681
		return 0;
2682
	return attached_disk->fops->check_events(attached_disk, clearing);
L
Linus Torvalds 已提交
2683 2684
}

2685
static const struct block_device_operations pktcdvd_ops = {
L
Linus Torvalds 已提交
2686
	.owner =		THIS_MODULE,
A
Al Viro 已提交
2687 2688
	.open =			pkt_open,
	.release =		pkt_close,
2689
	.ioctl =		pkt_ioctl,
2690
	.check_events =		pkt_check_events,
L
Linus Torvalds 已提交
2691 2692
};

2693
static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode)
2694 2695 2696 2697
{
	return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name);
}

L
Linus Torvalds 已提交
2698 2699 2700
/*
 * Set up mapping from pktcdvd device to CD-ROM device.
 */
2701
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
L
Linus Torvalds 已提交
2702 2703 2704 2705 2706
{
	int idx;
	int ret = -ENOMEM;
	struct pktcdvd_device *pd;
	struct gendisk *disk;
2707 2708

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
2709 2710 2711 2712 2713

	for (idx = 0; idx < MAX_WRITERS; idx++)
		if (!pkt_devs[idx])
			break;
	if (idx == MAX_WRITERS) {
2714
		pr_err("max %d writers supported\n", MAX_WRITERS);
2715 2716
		ret = -EBUSY;
		goto out_mutex;
L
Linus Torvalds 已提交
2717 2718
	}

2719
	pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
L
Linus Torvalds 已提交
2720
	if (!pd)
2721
		goto out_mutex;
L
Linus Torvalds 已提交
2722

2723 2724 2725
	ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
					sizeof(struct pkt_rb_node));
	if (ret)
L
Linus Torvalds 已提交
2726 2727
		goto out_mem;

2728 2729 2730 2731
	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
	INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
	spin_lock_init(&pd->cdrw.active_list_lock);

L
Linus Torvalds 已提交
2732 2733
	spin_lock_init(&pd->lock);
	spin_lock_init(&pd->iosched.lock);
2734 2735
	bio_list_init(&pd->iosched.read_queue);
	bio_list_init(&pd->iosched.write_queue);
2736
	sprintf(pd->name, DRIVER_NAME"%d", idx);
L
Linus Torvalds 已提交
2737 2738 2739
	init_waitqueue_head(&pd->wqueue);
	pd->bio_queue = RB_ROOT;

2740 2741 2742
	pd->write_congestion_on  = write_congestion_on;
	pd->write_congestion_off = write_congestion_off;

2743 2744 2745 2746
	disk = alloc_disk(1);
	if (!disk)
		goto out_mem;
	pd->disk = disk;
2747
	disk->major = pktdev_major;
L
Linus Torvalds 已提交
2748 2749 2750
	disk->first_minor = idx;
	disk->fops = &pktcdvd_ops;
	disk->flags = GENHD_FL_REMOVABLE;
2751
	strcpy(disk->disk_name, pd->name);
2752
	disk->devnode = pktcdvd_devnode;
L
Linus Torvalds 已提交
2753 2754 2755 2756 2757
	disk->private_data = pd;
	disk->queue = blk_alloc_queue(GFP_KERNEL);
	if (!disk->queue)
		goto out_mem2;

2758
	pd->pkt_dev = MKDEV(pktdev_major, idx);
L
Linus Torvalds 已提交
2759 2760
	ret = pkt_new_dev(pd, dev);
	if (ret)
2761
		goto out_mem2;
L
Linus Torvalds 已提交
2762

2763 2764 2765 2766
	/* inherit events of the host device */
	disk->events = pd->bdev->bd_disk->events;
	disk->async_events = pd->bdev->bd_disk->async_events;

L
Linus Torvalds 已提交
2767
	add_disk(disk);
2768

2769 2770 2771
	pkt_sysfs_dev_new(pd);
	pkt_debugfs_dev_new(pd);

L
Linus Torvalds 已提交
2772
	pkt_devs[idx] = pd;
2773 2774 2775 2776
	if (pkt_dev)
		*pkt_dev = pd->pkt_dev;

	mutex_unlock(&ctl_mutex);
L
Linus Torvalds 已提交
2777 2778 2779 2780 2781
	return 0;

out_mem2:
	put_disk(disk);
out_mem:
2782
	mempool_exit(&pd->rb_pool);
L
Linus Torvalds 已提交
2783
	kfree(pd);
2784 2785
out_mutex:
	mutex_unlock(&ctl_mutex);
2786
	pr_err("setup of pktcdvd device failed\n");
L
Linus Torvalds 已提交
2787 2788 2789 2790 2791 2792
	return ret;
}

/*
 * Tear down mapping from pktcdvd device to CD-ROM device.
 */
2793
static int pkt_remove_dev(dev_t pkt_dev)
L
Linus Torvalds 已提交
2794 2795 2796
{
	struct pktcdvd_device *pd;
	int idx;
2797 2798 2799
	int ret = 0;

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
2800 2801 2802 2803 2804 2805 2806

	for (idx = 0; idx < MAX_WRITERS; idx++) {
		pd = pkt_devs[idx];
		if (pd && (pd->pkt_dev == pkt_dev))
			break;
	}
	if (idx == MAX_WRITERS) {
2807
		pr_debug("dev not setup\n");
2808 2809
		ret = -ENXIO;
		goto out;
L
Linus Torvalds 已提交
2810 2811
	}

2812 2813 2814 2815
	if (pd->refcnt > 0) {
		ret = -EBUSY;
		goto out;
	}
L
Linus Torvalds 已提交
2816 2817 2818
	if (!IS_ERR(pd->cdrw.thread))
		kthread_stop(pd->cdrw.thread);

2819 2820 2821 2822 2823
	pkt_devs[idx] = NULL;

	pkt_debugfs_dev_remove(pd);
	pkt_sysfs_dev_remove(pd);

2824
	blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
L
Linus Torvalds 已提交
2825 2826

	remove_proc_entry(pd->name, pkt_proc);
2827
	pkt_dbg(1, pd, "writer unmapped\n");
L
Linus Torvalds 已提交
2828 2829

	del_gendisk(pd->disk);
2830
	blk_cleanup_queue(pd->disk->queue);
L
Linus Torvalds 已提交
2831 2832
	put_disk(pd->disk);

2833
	mempool_exit(&pd->rb_pool);
L
Linus Torvalds 已提交
2834 2835 2836 2837
	kfree(pd);

	/* This is safe: open() is still holding a reference. */
	module_put(THIS_MODULE);
2838 2839 2840 2841

out:
	mutex_unlock(&ctl_mutex);
	return ret;
L
Linus Torvalds 已提交
2842 2843 2844 2845
}

static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
{
2846 2847 2848 2849 2850
	struct pktcdvd_device *pd;

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);

	pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
L
Linus Torvalds 已提交
2851 2852 2853 2854 2855 2856 2857 2858
	if (pd) {
		ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
		ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
	} else {
		ctrl_cmd->dev = 0;
		ctrl_cmd->pkt_dev = 0;
	}
	ctrl_cmd->num_devices = MAX_WRITERS;
2859 2860

	mutex_unlock(&ctl_mutex);
L
Linus Torvalds 已提交
2861 2862
}

2863
static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
2864 2865 2866 2867
{
	void __user *argp = (void __user *)arg;
	struct pkt_ctrl_command ctrl_cmd;
	int ret = 0;
2868
	dev_t pkt_dev = 0;
L
Linus Torvalds 已提交
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879

	if (cmd != PACKET_CTRL_CMD)
		return -ENOTTY;

	if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
		return -EFAULT;

	switch (ctrl_cmd.command) {
	case PKT_CTRL_CMD_SETUP:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
2880 2881
		ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
		ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
L
Linus Torvalds 已提交
2882 2883 2884 2885
		break;
	case PKT_CTRL_CMD_TEARDOWN:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
2886
		ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
L
Linus Torvalds 已提交
2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899
		break;
	case PKT_CTRL_CMD_STATUS:
		pkt_get_status(&ctrl_cmd);
		break;
	default:
		return -ENOTTY;
	}

	if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
		return -EFAULT;
	return ret;
}

2900 2901 2902 2903 2904 2905
#ifdef CONFIG_COMPAT
static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
L
Linus Torvalds 已提交
2906

2907
static const struct file_operations pkt_ctl_fops = {
2908 2909 2910 2911 2912 2913
	.open		= nonseekable_open,
	.unlocked_ioctl	= pkt_ctl_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= pkt_ctl_compat_ioctl,
#endif
	.owner		= THIS_MODULE,
2914
	.llseek		= no_llseek,
L
Linus Torvalds 已提交
2915 2916 2917 2918
};

static struct miscdevice pkt_misc = {
	.minor 		= MISC_DYNAMIC_MINOR,
2919
	.name  		= DRIVER_NAME,
2920
	.nodename	= "pktcdvd/control",
L
Linus Torvalds 已提交
2921 2922 2923 2924 2925 2926 2927
	.fops  		= &pkt_ctl_fops
};

static int __init pkt_init(void)
{
	int ret;

2928 2929
	mutex_init(&ctl_mutex);

2930 2931 2932 2933 2934 2935 2936 2937
	ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
				    sizeof(struct packet_stacked_data));
	if (ret)
		return ret;
	ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
	if (ret) {
		mempool_exit(&psd_pool);
		return ret;
2938
	}
L
Linus Torvalds 已提交
2939

2940
	ret = register_blkdev(pktdev_major, DRIVER_NAME);
L
Linus Torvalds 已提交
2941
	if (ret < 0) {
2942
		pr_err("unable to register block device\n");
L
Linus Torvalds 已提交
2943 2944
		goto out2;
	}
2945 2946
	if (!pktdev_major)
		pktdev_major = ret;
L
Linus Torvalds 已提交
2947

2948 2949 2950 2951 2952 2953
	ret = pkt_sysfs_init();
	if (ret)
		goto out;

	pkt_debugfs_init();

L
Linus Torvalds 已提交
2954 2955
	ret = misc_register(&pkt_misc);
	if (ret) {
2956
		pr_err("unable to register misc device\n");
2957
		goto out_misc;
L
Linus Torvalds 已提交
2958 2959
	}

A
Alexey Dobriyan 已提交
2960
	pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
L
Linus Torvalds 已提交
2961 2962 2963

	return 0;

2964 2965 2966
out_misc:
	pkt_debugfs_cleanup();
	pkt_sysfs_cleanup();
L
Linus Torvalds 已提交
2967
out:
2968
	unregister_blkdev(pktdev_major, DRIVER_NAME);
L
Linus Torvalds 已提交
2969
out2:
2970 2971
	mempool_exit(&psd_pool);
	bioset_exit(&pkt_bio_set);
L
Linus Torvalds 已提交
2972 2973 2974 2975 2976
	return ret;
}

static void __exit pkt_exit(void)
{
A
Alexey Dobriyan 已提交
2977
	remove_proc_entry("driver/"DRIVER_NAME, NULL);
L
Linus Torvalds 已提交
2978
	misc_deregister(&pkt_misc);
2979 2980 2981 2982

	pkt_debugfs_cleanup();
	pkt_sysfs_cleanup();

2983
	unregister_blkdev(pktdev_major, DRIVER_NAME);
2984 2985
	mempool_exit(&psd_pool);
	bioset_exit(&pkt_bio_set);
L
Linus Torvalds 已提交
2986 2987 2988 2989 2990 2991 2992 2993
}

MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
MODULE_LICENSE("GPL");

module_init(pkt_init);
module_exit(pkt_exit);