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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cba767175b
The pktcdvd created class devices only export some sysfs files, but have no char dev_t registered in the driver. At class device creation time they copy the dev_t value of the block device to the char device, wich will register a new char device in the driver core and userspace, with a conflicting dev_t value. In many cases the class devices dev_t just points to a random USB device. This fixes the sysfs "duplicate entry" errors. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Peter Osterlund <petero2@telia.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3129 lines
76 KiB
C
3129 lines
76 KiB
C
/*
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* Copyright (C) 2000 Jens Axboe <axboe@suse.de>
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* 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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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
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* DVD-RAM devices.
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*
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* Theory of operation:
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*
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* At the lowest level, there is the standard driver for the CD/DVD device,
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* typically ide-cd.c or sr.c. This driver can handle read and write requests,
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* but it doesn't know anything about the special restrictions that apply to
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* packet writing. One restriction is that write requests must be aligned to
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* packet boundaries on the physical media, and the size of a write request
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* must be equal to the packet size. Another restriction is that a
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* GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
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* command, if the previous command was a write.
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*
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* The purpose of the packet writing driver is to hide these restrictions from
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* higher layers, such as file systems, and present a block device that can be
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* randomly read and written using 2kB-sized blocks.
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*
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* The lowest layer in the packet writing driver is the packet I/O scheduler.
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* Its data is defined by the struct packet_iosched and includes two bio
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* queues with pending read and write requests. These queues are processed
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* by the pkt_iosched_process_queue() function. The write requests in this
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* queue are already properly aligned and sized. This layer is responsible for
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* issuing the flush cache commands and scheduling the I/O in a good order.
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*
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* The next layer transforms unaligned write requests to aligned writes. This
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* transformation requires reading missing pieces of data from the underlying
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* block device, assembling the pieces to full packets and queuing them to the
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* packet I/O scheduler.
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*
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* At the top layer there is a custom make_request_fn function that forwards
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* read requests directly to the iosched queue and puts write requests in the
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* unaligned write queue. A kernel thread performs the necessary read
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* gathering to convert the unaligned writes to aligned writes and then feeds
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* them to the packet I/O scheduler.
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*
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*************************************************************************/
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#include <linux/pktcdvd.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <linux/file.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#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 <scsi/scsi_cmnd.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <asm/uaccess.h>
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#define DRIVER_NAME "pktcdvd"
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#if PACKET_DEBUG
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#define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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#if PACKET_DEBUG > 1
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#define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
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#else
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#define VPRINTK(fmt, args...)
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#endif
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#define MAX_SPEED 0xffff
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#define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
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static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
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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;
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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;
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static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
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static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */
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/* forward declaration */
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static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
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static int pkt_remove_dev(dev_t pkt_dev);
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static int pkt_seq_show(struct seq_file *m, void *p);
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/*
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* create and register a pktcdvd kernel object.
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*/
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static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
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const char* name,
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struct kobject* parent,
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struct kobj_type* ktype)
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{
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struct pktcdvd_kobj *p;
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int error;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return NULL;
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p->pd = pd;
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error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
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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;
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}
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/*
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* remove a pktcdvd kernel object.
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*/
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static void pkt_kobj_remove(struct pktcdvd_kobj *p)
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{
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if (p)
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kobject_put(&p->kobj);
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}
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/*
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* default release function for pktcdvd kernel objects.
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*/
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static void pkt_kobj_release(struct kobject *kobj)
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{
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kfree(to_pktcdvdkobj(kobj));
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}
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/**********************************************************
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*
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* sysfs interface for pktcdvd
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* by (C) 2006 Thomas Maier <balagi@justmail.de>
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*
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**********************************************************/
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#define DEF_ATTR(_obj,_name,_mode) \
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static struct attribute _obj = { .name = _name, .mode = _mode }
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/**********************************************************
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/sys/class/pktcdvd/pktcdvd[0-7]/
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stat/reset
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stat/packets_started
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stat/packets_finished
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stat/kb_written
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stat/kb_read
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stat/kb_read_gather
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write_queue/size
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write_queue/congestion_off
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write_queue/congestion_on
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**********************************************************/
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DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
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DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
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DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
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DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
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DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
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DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
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static struct attribute *kobj_pkt_attrs_stat[] = {
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&kobj_pkt_attr_st1,
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&kobj_pkt_attr_st2,
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&kobj_pkt_attr_st3,
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&kobj_pkt_attr_st4,
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&kobj_pkt_attr_st5,
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&kobj_pkt_attr_st6,
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NULL
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};
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DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
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DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
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DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
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static struct attribute *kobj_pkt_attrs_wqueue[] = {
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&kobj_pkt_attr_wq1,
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&kobj_pkt_attr_wq2,
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&kobj_pkt_attr_wq3,
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NULL
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};
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static ssize_t kobj_pkt_show(struct kobject *kobj,
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struct attribute *attr, char *data)
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{
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struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
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int n = 0;
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int v;
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if (strcmp(attr->name, "packets_started") == 0) {
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n = sprintf(data, "%lu\n", pd->stats.pkt_started);
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} else if (strcmp(attr->name, "packets_finished") == 0) {
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n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
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} else if (strcmp(attr->name, "kb_written") == 0) {
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n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
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} else if (strcmp(attr->name, "kb_read") == 0) {
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n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
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} else if (strcmp(attr->name, "kb_read_gather") == 0) {
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n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
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} else if (strcmp(attr->name, "size") == 0) {
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spin_lock(&pd->lock);
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v = pd->bio_queue_size;
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spin_unlock(&pd->lock);
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n = sprintf(data, "%d\n", v);
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} else if (strcmp(attr->name, "congestion_off") == 0) {
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spin_lock(&pd->lock);
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v = pd->write_congestion_off;
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spin_unlock(&pd->lock);
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n = sprintf(data, "%d\n", v);
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} else if (strcmp(attr->name, "congestion_on") == 0) {
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spin_lock(&pd->lock);
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v = pd->write_congestion_on;
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spin_unlock(&pd->lock);
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n = sprintf(data, "%d\n", v);
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}
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return n;
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}
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static void init_write_congestion_marks(int* lo, int* hi)
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{
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if (*hi > 0) {
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*hi = max(*hi, 500);
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*hi = min(*hi, 1000000);
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if (*lo <= 0)
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*lo = *hi - 100;
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else {
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*lo = min(*lo, *hi - 100);
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*lo = max(*lo, 100);
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}
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} else {
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*hi = -1;
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*lo = -1;
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}
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}
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static ssize_t kobj_pkt_store(struct kobject *kobj,
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struct attribute *attr,
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const char *data, size_t len)
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{
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struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
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int val;
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if (strcmp(attr->name, "reset") == 0 && len > 0) {
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pd->stats.pkt_started = 0;
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pd->stats.pkt_ended = 0;
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pd->stats.secs_w = 0;
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pd->stats.secs_rg = 0;
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pd->stats.secs_r = 0;
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} 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);
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pd->write_congestion_off = val;
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init_write_congestion_marks(&pd->write_congestion_off,
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&pd->write_congestion_on);
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spin_unlock(&pd->lock);
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} 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);
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pd->write_congestion_on = val;
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init_write_congestion_marks(&pd->write_congestion_off,
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&pd->write_congestion_on);
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spin_unlock(&pd->lock);
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}
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return len;
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}
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static struct sysfs_ops kobj_pkt_ops = {
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.show = kobj_pkt_show,
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.store = kobj_pkt_store
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};
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static struct kobj_type kobj_pkt_type_stat = {
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.release = pkt_kobj_release,
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.sysfs_ops = &kobj_pkt_ops,
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.default_attrs = kobj_pkt_attrs_stat
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};
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static struct kobj_type kobj_pkt_type_wqueue = {
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.release = pkt_kobj_release,
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.sysfs_ops = &kobj_pkt_ops,
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.default_attrs = kobj_pkt_attrs_wqueue
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};
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static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
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{
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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))
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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);
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pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
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&pd->dev->kobj,
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&kobj_pkt_type_wqueue);
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}
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}
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static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
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{
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pkt_kobj_remove(pd->kobj_stat);
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pkt_kobj_remove(pd->kobj_wqueue);
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if (class_pktcdvd)
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device_destroy(class_pktcdvd, pd->pkt_dev);
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}
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/********************************************************************
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/sys/class/pktcdvd/
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add map block device
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remove unmap packet dev
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device_map show mappings
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*******************************************************************/
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static void class_pktcdvd_release(struct class *cls)
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{
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kfree(cls);
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}
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static ssize_t class_pktcdvd_show_map(struct class *c, char *data)
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{
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int n = 0;
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int idx;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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for (idx = 0; idx < MAX_WRITERS; idx++) {
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struct pktcdvd_device *pd = pkt_devs[idx];
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if (!pd)
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continue;
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n += sprintf(data+n, "%s %u:%u %u:%u\n",
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pd->name,
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MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
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MAJOR(pd->bdev->bd_dev),
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MINOR(pd->bdev->bd_dev));
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}
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mutex_unlock(&ctl_mutex);
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return n;
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}
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static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
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size_t count)
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{
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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 */
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if (!try_module_get(THIS_MODULE))
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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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}
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return -EINVAL;
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}
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static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf,
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size_t count)
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{
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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));
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return count;
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}
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return -EINVAL;
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}
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static struct class_attribute class_pktcdvd_attrs[] = {
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__ATTR(add, 0200, NULL, class_pktcdvd_store_add),
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__ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
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__ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
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__ATTR_NULL
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};
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static int pkt_sysfs_init(void)
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{
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int ret = 0;
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/*
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* create control files in sysfs
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* /sys/class/pktcdvd/...
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*/
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class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
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if (!class_pktcdvd)
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return -ENOMEM;
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class_pktcdvd->name = DRIVER_NAME;
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class_pktcdvd->owner = THIS_MODULE;
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class_pktcdvd->class_release = class_pktcdvd_release;
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class_pktcdvd->class_attrs = class_pktcdvd_attrs;
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ret = class_register(class_pktcdvd);
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if (ret) {
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kfree(class_pktcdvd);
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class_pktcdvd = NULL;
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printk(DRIVER_NAME": failed to create class pktcdvd\n");
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return ret;
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}
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return 0;
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}
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static void pkt_sysfs_cleanup(void)
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{
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if (class_pktcdvd)
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class_destroy(class_pktcdvd);
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class_pktcdvd = NULL;
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}
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/********************************************************************
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entries in debugfs
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/debugfs/pktcdvd[0-7]/
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info
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*******************************************************************/
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static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
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{
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return pkt_seq_show(m, p);
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}
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static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pkt_debugfs_seq_show, inode->i_private);
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}
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static const struct file_operations debug_fops = {
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.open = pkt_debugfs_fops_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
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{
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if (!pkt_debugfs_root)
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return;
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pd->dfs_f_info = NULL;
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pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
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if (IS_ERR(pd->dfs_d_root)) {
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pd->dfs_d_root = NULL;
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return;
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}
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pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
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pd->dfs_d_root, pd, &debug_fops);
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if (IS_ERR(pd->dfs_f_info)) {
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pd->dfs_f_info = NULL;
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|
return;
|
|
}
|
|
}
|
|
|
|
static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
|
|
{
|
|
if (!pkt_debugfs_root)
|
|
return;
|
|
if (pd->dfs_f_info)
|
|
debugfs_remove(pd->dfs_f_info);
|
|
pd->dfs_f_info = NULL;
|
|
if (pd->dfs_d_root)
|
|
debugfs_remove(pd->dfs_d_root);
|
|
pd->dfs_d_root = NULL;
|
|
}
|
|
|
|
static void pkt_debugfs_init(void)
|
|
{
|
|
pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
|
|
if (IS_ERR(pkt_debugfs_root)) {
|
|
pkt_debugfs_root = NULL;
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void pkt_debugfs_cleanup(void)
|
|
{
|
|
if (!pkt_debugfs_root)
|
|
return;
|
|
debugfs_remove(pkt_debugfs_root);
|
|
pkt_debugfs_root = NULL;
|
|
}
|
|
|
|
/* ----------------------------------------------------------*/
|
|
|
|
|
|
static void pkt_bio_finished(struct pktcdvd_device *pd)
|
|
{
|
|
BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
|
|
if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
|
|
VPRINTK(DRIVER_NAME": queue empty\n");
|
|
atomic_set(&pd->iosched.attention, 1);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
}
|
|
|
|
static void pkt_bio_destructor(struct bio *bio)
|
|
{
|
|
kfree(bio->bi_io_vec);
|
|
kfree(bio);
|
|
}
|
|
|
|
static struct bio *pkt_bio_alloc(int nr_iovecs)
|
|
{
|
|
struct bio_vec *bvl = NULL;
|
|
struct bio *bio;
|
|
|
|
bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
|
|
if (!bio)
|
|
goto no_bio;
|
|
bio_init(bio);
|
|
|
|
bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
|
|
if (!bvl)
|
|
goto no_bvl;
|
|
|
|
bio->bi_max_vecs = nr_iovecs;
|
|
bio->bi_io_vec = bvl;
|
|
bio->bi_destructor = pkt_bio_destructor;
|
|
|
|
return bio;
|
|
|
|
no_bvl:
|
|
kfree(bio);
|
|
no_bio:
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocate a packet_data struct
|
|
*/
|
|
static struct packet_data *pkt_alloc_packet_data(int frames)
|
|
{
|
|
int i;
|
|
struct packet_data *pkt;
|
|
|
|
pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
|
|
if (!pkt)
|
|
goto no_pkt;
|
|
|
|
pkt->frames = frames;
|
|
pkt->w_bio = pkt_bio_alloc(frames);
|
|
if (!pkt->w_bio)
|
|
goto no_bio;
|
|
|
|
for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
|
|
pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
|
|
if (!pkt->pages[i])
|
|
goto no_page;
|
|
}
|
|
|
|
spin_lock_init(&pkt->lock);
|
|
|
|
for (i = 0; i < frames; i++) {
|
|
struct bio *bio = pkt_bio_alloc(1);
|
|
if (!bio)
|
|
goto no_rd_bio;
|
|
pkt->r_bios[i] = bio;
|
|
}
|
|
|
|
return pkt;
|
|
|
|
no_rd_bio:
|
|
for (i = 0; i < frames; i++) {
|
|
struct bio *bio = pkt->r_bios[i];
|
|
if (bio)
|
|
bio_put(bio);
|
|
}
|
|
|
|
no_page:
|
|
for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
|
|
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;
|
|
|
|
for (i = 0; i < pkt->frames; i++) {
|
|
struct bio *bio = pkt->r_bios[i];
|
|
if (bio)
|
|
bio_put(bio);
|
|
}
|
|
for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
|
|
__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);
|
|
}
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
|
|
}
|
|
|
|
static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
|
|
{
|
|
struct packet_data *pkt;
|
|
|
|
BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
|
|
|
|
while (nr_packets > 0) {
|
|
pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
|
|
if (!pkt) {
|
|
pkt_shrink_pktlist(pd);
|
|
return 0;
|
|
}
|
|
pkt->id = nr_packets;
|
|
pkt->pd = pd;
|
|
list_add(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
nr_packets--;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
|
|
{
|
|
struct rb_node *n = rb_next(&node->rb_node);
|
|
if (!n)
|
|
return NULL;
|
|
return rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
|
|
static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
|
|
{
|
|
rb_erase(&node->rb_node, &pd->bio_queue);
|
|
mempool_free(node, pd->rb_pool);
|
|
pd->bio_queue_size--;
|
|
BUG_ON(pd->bio_queue_size < 0);
|
|
}
|
|
|
|
/*
|
|
* Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
|
|
*/
|
|
static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
|
|
{
|
|
struct rb_node *n = pd->bio_queue.rb_node;
|
|
struct rb_node *next;
|
|
struct pkt_rb_node *tmp;
|
|
|
|
if (!n) {
|
|
BUG_ON(pd->bio_queue_size > 0);
|
|
return NULL;
|
|
}
|
|
|
|
for (;;) {
|
|
tmp = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
if (s <= tmp->bio->bi_sector)
|
|
next = n->rb_left;
|
|
else
|
|
next = n->rb_right;
|
|
if (!next)
|
|
break;
|
|
n = next;
|
|
}
|
|
|
|
if (s > tmp->bio->bi_sector) {
|
|
tmp = pkt_rbtree_next(tmp);
|
|
if (!tmp)
|
|
return NULL;
|
|
}
|
|
BUG_ON(s > tmp->bio->bi_sector);
|
|
return tmp;
|
|
}
|
|
|
|
/*
|
|
* Insert a node into the pd->bio_queue rb tree.
|
|
*/
|
|
static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
|
|
{
|
|
struct rb_node **p = &pd->bio_queue.rb_node;
|
|
struct rb_node *parent = NULL;
|
|
sector_t s = node->bio->bi_sector;
|
|
struct pkt_rb_node *tmp;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
|
|
if (s < tmp->bio->bi_sector)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
rb_link_node(&node->rb_node, parent, p);
|
|
rb_insert_color(&node->rb_node, &pd->bio_queue);
|
|
pd->bio_queue_size++;
|
|
}
|
|
|
|
/*
|
|
* Add a bio to a single linked list defined by its head and tail pointers.
|
|
*/
|
|
static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
|
|
{
|
|
bio->bi_next = NULL;
|
|
if (*list_tail) {
|
|
BUG_ON((*list_head) == NULL);
|
|
(*list_tail)->bi_next = bio;
|
|
(*list_tail) = bio;
|
|
} else {
|
|
BUG_ON((*list_head) != NULL);
|
|
(*list_head) = bio;
|
|
(*list_tail) = bio;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove and return the first bio from a single linked list defined by its
|
|
* head and tail pointers.
|
|
*/
|
|
static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
|
|
{
|
|
struct bio *bio;
|
|
|
|
if (*list_head == NULL)
|
|
return NULL;
|
|
|
|
bio = *list_head;
|
|
*list_head = bio->bi_next;
|
|
if (*list_head == NULL)
|
|
*list_tail = NULL;
|
|
|
|
bio->bi_next = NULL;
|
|
return bio;
|
|
}
|
|
|
|
/*
|
|
* Send a packet_command to the underlying block device and
|
|
* wait for completion.
|
|
*/
|
|
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(pd->bdev);
|
|
struct request *rq;
|
|
int ret = 0;
|
|
|
|
rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
|
|
WRITE : READ, __GFP_WAIT);
|
|
|
|
if (cgc->buflen) {
|
|
if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
|
|
goto out;
|
|
}
|
|
|
|
rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
|
|
memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
|
|
|
|
rq->timeout = 60*HZ;
|
|
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
|
rq->cmd_flags |= REQ_HARDBARRIER;
|
|
if (cgc->quiet)
|
|
rq->cmd_flags |= REQ_QUIET;
|
|
|
|
blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
|
|
if (rq->errors)
|
|
ret = -EIO;
|
|
out:
|
|
blk_put_request(rq);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* A generic sense dump / resolve mechanism should be implemented across
|
|
* all ATAPI + SCSI devices.
|
|
*/
|
|
static void pkt_dump_sense(struct packet_command *cgc)
|
|
{
|
|
static char *info[9] = { "No sense", "Recovered error", "Not ready",
|
|
"Medium error", "Hardware error", "Illegal request",
|
|
"Unit attention", "Data protect", "Blank check" };
|
|
int i;
|
|
struct request_sense *sense = cgc->sense;
|
|
|
|
printk(DRIVER_NAME":");
|
|
for (i = 0; i < CDROM_PACKET_SIZE; i++)
|
|
printk(" %02x", cgc->cmd[i]);
|
|
printk(" - ");
|
|
|
|
if (sense == NULL) {
|
|
printk("no sense\n");
|
|
return;
|
|
}
|
|
|
|
printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
|
|
|
|
if (sense->sense_key > 8) {
|
|
printk(" (INVALID)\n");
|
|
return;
|
|
}
|
|
|
|
printk(" (%s)\n", info[sense->sense_key]);
|
|
}
|
|
|
|
/*
|
|
* flush the drive cache to media
|
|
*/
|
|
static int pkt_flush_cache(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_command cgc;
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.cmd[0] = GPCMD_FLUSH_CACHE;
|
|
cgc.quiet = 1;
|
|
|
|
/*
|
|
* the IMMED bit -- we default to not setting it, although that
|
|
* would allow a much faster close, this is safer
|
|
*/
|
|
#if 0
|
|
cgc.cmd[1] = 1 << 1;
|
|
#endif
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
/*
|
|
* speed is given as the normal factor, e.g. 4 for 4x
|
|
*/
|
|
static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
|
|
unsigned write_speed, unsigned read_speed)
|
|
{
|
|
struct packet_command cgc;
|
|
struct 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;
|
|
|
|
if ((ret = pkt_generic_packet(pd, &cgc)))
|
|
pkt_dump_sense(&cgc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Queue a bio for processing by the low-level CD device. Must be called
|
|
* from process context.
|
|
*/
|
|
static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
|
|
{
|
|
spin_lock(&pd->iosched.lock);
|
|
if (bio_data_dir(bio) == READ) {
|
|
pkt_add_list_last(bio, &pd->iosched.read_queue,
|
|
&pd->iosched.read_queue_tail);
|
|
} else {
|
|
pkt_add_list_last(bio, &pd->iosched.write_queue,
|
|
&pd->iosched.write_queue_tail);
|
|
}
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
atomic_set(&pd->iosched.attention, 1);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
|
|
/*
|
|
* Process the queued read/write requests. This function handles special
|
|
* requirements for CDRW drives:
|
|
* - A cache flush command must be inserted before a read request if the
|
|
* previous request was a write.
|
|
* - Switching between reading and writing is slow, so don't do it more often
|
|
* than necessary.
|
|
* - Optimize for throughput at the expense of latency. This means that streaming
|
|
* writes will never be interrupted by a read, but if the drive has to seek
|
|
* before the next write, switch to reading instead if there are any pending
|
|
* read requests.
|
|
* - Set the read speed according to current usage pattern. When only reading
|
|
* from the device, it's best to use the highest possible read speed, but
|
|
* when switching often between reading and writing, it's better to have the
|
|
* same read and write speeds.
|
|
*/
|
|
static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
|
|
{
|
|
|
|
if (atomic_read(&pd->iosched.attention) == 0)
|
|
return;
|
|
atomic_set(&pd->iosched.attention, 0);
|
|
|
|
for (;;) {
|
|
struct bio *bio;
|
|
int reads_queued, writes_queued;
|
|
|
|
spin_lock(&pd->iosched.lock);
|
|
reads_queued = (pd->iosched.read_queue != NULL);
|
|
writes_queued = (pd->iosched.write_queue != NULL);
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
if (!reads_queued && !writes_queued)
|
|
break;
|
|
|
|
if (pd->iosched.writing) {
|
|
int need_write_seek = 1;
|
|
spin_lock(&pd->iosched.lock);
|
|
bio = pd->iosched.write_queue;
|
|
spin_unlock(&pd->iosched.lock);
|
|
if (bio && (bio->bi_sector == pd->iosched.last_write))
|
|
need_write_seek = 0;
|
|
if (need_write_seek && reads_queued) {
|
|
if (atomic_read(&pd->cdrw.pending_bios) > 0) {
|
|
VPRINTK(DRIVER_NAME": write, waiting\n");
|
|
break;
|
|
}
|
|
pkt_flush_cache(pd);
|
|
pd->iosched.writing = 0;
|
|
}
|
|
} else {
|
|
if (!reads_queued && writes_queued) {
|
|
if (atomic_read(&pd->cdrw.pending_bios) > 0) {
|
|
VPRINTK(DRIVER_NAME": read, waiting\n");
|
|
break;
|
|
}
|
|
pd->iosched.writing = 1;
|
|
}
|
|
}
|
|
|
|
spin_lock(&pd->iosched.lock);
|
|
if (pd->iosched.writing) {
|
|
bio = pkt_get_list_first(&pd->iosched.write_queue,
|
|
&pd->iosched.write_queue_tail);
|
|
} else {
|
|
bio = pkt_get_list_first(&pd->iosched.read_queue,
|
|
&pd->iosched.read_queue_tail);
|
|
}
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
if (!bio)
|
|
continue;
|
|
|
|
if (bio_data_dir(bio) == READ)
|
|
pd->iosched.successive_reads += bio->bi_size >> 10;
|
|
else {
|
|
pd->iosched.successive_reads = 0;
|
|
pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
|
|
}
|
|
if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
|
|
if (pd->read_speed == pd->write_speed) {
|
|
pd->read_speed = MAX_SPEED;
|
|
pkt_set_speed(pd, pd->write_speed, pd->read_speed);
|
|
}
|
|
} else {
|
|
if (pd->read_speed != pd->write_speed) {
|
|
pd->read_speed = pd->write_speed;
|
|
pkt_set_speed(pd, pd->write_speed, pd->read_speed);
|
|
}
|
|
}
|
|
|
|
atomic_inc(&pd->cdrw.pending_bios);
|
|
generic_make_request(bio);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Special care is needed if the underlying block device has a small
|
|
* max_phys_segments value.
|
|
*/
|
|
static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
|
|
{
|
|
if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
|
|
/*
|
|
* The cdrom device can handle one segment/frame
|
|
*/
|
|
clear_bit(PACKET_MERGE_SEGS, &pd->flags);
|
|
return 0;
|
|
} else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
|
|
/*
|
|
* 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 {
|
|
printk(DRIVER_NAME": cdrom max_phys_segments too small\n");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Copy CD_FRAMESIZE bytes from src_bio into a destination page
|
|
*/
|
|
static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
|
|
{
|
|
unsigned int copy_size = CD_FRAMESIZE;
|
|
|
|
while (copy_size > 0) {
|
|
struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
|
|
void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
|
|
src_bvl->bv_offset + offs;
|
|
void *vto = page_address(dst_page) + dst_offs;
|
|
int len = min_t(int, copy_size, src_bvl->bv_len - offs);
|
|
|
|
BUG_ON(len < 0);
|
|
memcpy(vto, vfrom, len);
|
|
kunmap_atomic(vfrom, KM_USER0);
|
|
|
|
seg++;
|
|
offs = 0;
|
|
dst_offs += len;
|
|
copy_size -= len;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Copy all data for this packet to pkt->pages[], so that
|
|
* a) The number of required segments for the write bio is minimized, which
|
|
* is necessary for some scsi controllers.
|
|
* b) The data can be used as cache to avoid read requests if we receive a
|
|
* new write request for the same zone.
|
|
*/
|
|
static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
|
|
{
|
|
int f, p, offs;
|
|
|
|
/* Copy all data to pkt->pages[] */
|
|
p = 0;
|
|
offs = 0;
|
|
for (f = 0; f < pkt->frames; f++) {
|
|
if (bvec[f].bv_page != pkt->pages[p]) {
|
|
void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset;
|
|
void *vto = page_address(pkt->pages[p]) + offs;
|
|
memcpy(vto, vfrom, CD_FRAMESIZE);
|
|
kunmap_atomic(vfrom, KM_USER0);
|
|
bvec[f].bv_page = pkt->pages[p];
|
|
bvec[f].bv_offset = offs;
|
|
} else {
|
|
BUG_ON(bvec[f].bv_offset != offs);
|
|
}
|
|
offs += CD_FRAMESIZE;
|
|
if (offs >= PAGE_SIZE) {
|
|
offs = 0;
|
|
p++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pkt_end_io_read(struct bio *bio, int err)
|
|
{
|
|
struct packet_data *pkt = bio->bi_private;
|
|
struct pktcdvd_device *pd = pkt->pd;
|
|
BUG_ON(!pd);
|
|
|
|
VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
|
|
(unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
|
|
|
|
if (err)
|
|
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);
|
|
}
|
|
|
|
static void pkt_end_io_packet_write(struct bio *bio, int err)
|
|
{
|
|
struct packet_data *pkt = bio->bi_private;
|
|
struct pktcdvd_device *pd = pkt->pd;
|
|
BUG_ON(!pd);
|
|
|
|
VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
|
|
|
|
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];
|
|
|
|
BUG_ON(!pkt->orig_bios);
|
|
|
|
atomic_set(&pkt->io_wait, 0);
|
|
atomic_set(&pkt->io_errors, 0);
|
|
|
|
/*
|
|
* Figure out which frames we need to read before we can write.
|
|
*/
|
|
memset(written, 0, sizeof(written));
|
|
spin_lock(&pkt->lock);
|
|
for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
|
|
int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
|
|
int num_frames = bio->bi_size / CD_FRAMESIZE;
|
|
pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
|
|
BUG_ON(first_frame < 0);
|
|
BUG_ON(first_frame + num_frames > pkt->frames);
|
|
for (f = first_frame; f < first_frame + num_frames; f++)
|
|
written[f] = 1;
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
|
|
if (pkt->cache_valid) {
|
|
VPRINTK("pkt_gather_data: zone %llx cached\n",
|
|
(unsigned long long)pkt->sector);
|
|
goto out_account;
|
|
}
|
|
|
|
/*
|
|
* Schedule reads for missing parts of the packet.
|
|
*/
|
|
for (f = 0; f < pkt->frames; f++) {
|
|
struct bio_vec *vec;
|
|
|
|
int p, offset;
|
|
if (written[f])
|
|
continue;
|
|
bio = pkt->r_bios[f];
|
|
vec = bio->bi_io_vec;
|
|
bio_init(bio);
|
|
bio->bi_max_vecs = 1;
|
|
bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
|
|
bio->bi_bdev = pd->bdev;
|
|
bio->bi_end_io = pkt_end_io_read;
|
|
bio->bi_private = pkt;
|
|
bio->bi_io_vec = vec;
|
|
bio->bi_destructor = pkt_bio_destructor;
|
|
|
|
p = (f * CD_FRAMESIZE) / PAGE_SIZE;
|
|
offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
|
|
VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
|
|
f, pkt->pages[p], offset);
|
|
if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
|
|
BUG();
|
|
|
|
atomic_inc(&pkt->io_wait);
|
|
bio->bi_rw = READ;
|
|
pkt_queue_bio(pd, bio);
|
|
frames_read++;
|
|
}
|
|
|
|
out_account:
|
|
VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
|
|
frames_read, (unsigned long long)pkt->sector);
|
|
pd->stats.pkt_started++;
|
|
pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
|
|
}
|
|
|
|
/*
|
|
* Find a packet matching zone, or the least recently used packet if
|
|
* there is no match.
|
|
*/
|
|
static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
|
|
{
|
|
struct packet_data *pkt;
|
|
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
|
|
if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
|
|
list_del_init(&pkt->list);
|
|
if (pkt->sector != zone)
|
|
pkt->cache_valid = 0;
|
|
return pkt;
|
|
}
|
|
}
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
|
|
static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
if (pkt->cache_valid) {
|
|
list_add(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
} else {
|
|
list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (!sb->s_op || !sb->s_op->relocate_blocks)
|
|
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;
|
|
|
|
pkt->bio->bi_sector = new_sector;
|
|
pkt->bio->bi_next = NULL;
|
|
pkt->bio->bi_flags = 1 << BIO_UPTODATE;
|
|
pkt->bio->bi_idx = 0;
|
|
|
|
BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
|
|
BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
|
|
BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
|
|
BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
|
|
BUG_ON(pkt->bio->bi_private != pkt);
|
|
|
|
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;
|
|
VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
|
|
state_name[old_state], state_name[state]);
|
|
#endif
|
|
pkt->state = state;
|
|
}
|
|
|
|
/*
|
|
* Scan the work queue to see if we can start a new packet.
|
|
* returns non-zero if any work was done.
|
|
*/
|
|
static int pkt_handle_queue(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_data *pkt, *p;
|
|
struct bio *bio = NULL;
|
|
sector_t zone = 0; /* Suppress gcc warning */
|
|
struct pkt_rb_node *node, *first_node;
|
|
struct rb_node *n;
|
|
int wakeup;
|
|
|
|
VPRINTK("handle_queue\n");
|
|
|
|
atomic_set(&pd->scan_queue, 0);
|
|
|
|
if (list_empty(&pd->cdrw.pkt_free_list)) {
|
|
VPRINTK("handle_queue: no pkt\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to find a zone we are not already working on.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
first_node = pkt_rbtree_find(pd, pd->current_sector);
|
|
if (!first_node) {
|
|
n = rb_first(&pd->bio_queue);
|
|
if (n)
|
|
first_node = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
node = first_node;
|
|
while (node) {
|
|
bio = node->bio;
|
|
zone = ZONE(bio->bi_sector, pd);
|
|
list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
|
|
if (p->sector == zone) {
|
|
bio = NULL;
|
|
goto try_next_bio;
|
|
}
|
|
}
|
|
break;
|
|
try_next_bio:
|
|
node = pkt_rbtree_next(node);
|
|
if (!node) {
|
|
n = rb_first(&pd->bio_queue);
|
|
if (n)
|
|
node = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
if (node == first_node)
|
|
node = NULL;
|
|
}
|
|
spin_unlock(&pd->lock);
|
|
if (!bio) {
|
|
VPRINTK("handle_queue: no bio\n");
|
|
return 0;
|
|
}
|
|
|
|
pkt = pkt_get_packet_data(pd, zone);
|
|
|
|
pd->current_sector = zone + pd->settings.size;
|
|
pkt->sector = zone;
|
|
BUG_ON(pkt->frames != pd->settings.size >> 2);
|
|
pkt->write_size = 0;
|
|
|
|
/*
|
|
* Scan work queue for bios in the same zone and link them
|
|
* to this packet.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
|
|
while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
|
|
bio = node->bio;
|
|
VPRINTK("pkt_handle_queue: found zone=%llx\n",
|
|
(unsigned long long)ZONE(bio->bi_sector, pd));
|
|
if (ZONE(bio->bi_sector, pd) != zone)
|
|
break;
|
|
pkt_rbtree_erase(pd, node);
|
|
spin_lock(&pkt->lock);
|
|
pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
|
|
pkt->write_size += bio->bi_size / CD_FRAMESIZE;
|
|
spin_unlock(&pkt->lock);
|
|
}
|
|
/* 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);
|
|
spin_unlock(&pd->lock);
|
|
if (wakeup)
|
|
clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE);
|
|
|
|
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)
|
|
{
|
|
struct bio *bio;
|
|
int f;
|
|
int frames_write;
|
|
struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
|
|
|
|
for (f = 0; f < pkt->frames; f++) {
|
|
bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
|
|
bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Fill-in bvec with data from orig_bios.
|
|
*/
|
|
frames_write = 0;
|
|
spin_lock(&pkt->lock);
|
|
for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
|
|
int segment = bio->bi_idx;
|
|
int src_offs = 0;
|
|
int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
|
|
int num_frames = bio->bi_size / CD_FRAMESIZE;
|
|
BUG_ON(first_frame < 0);
|
|
BUG_ON(first_frame + num_frames > pkt->frames);
|
|
for (f = first_frame; f < first_frame + num_frames; f++) {
|
|
struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
|
|
|
|
while (src_offs >= src_bvl->bv_len) {
|
|
src_offs -= src_bvl->bv_len;
|
|
segment++;
|
|
BUG_ON(segment >= bio->bi_vcnt);
|
|
src_bvl = bio_iovec_idx(bio, segment);
|
|
}
|
|
|
|
if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
|
|
bvec[f].bv_page = src_bvl->bv_page;
|
|
bvec[f].bv_offset = src_bvl->bv_offset + src_offs;
|
|
} else {
|
|
pkt_copy_bio_data(bio, segment, src_offs,
|
|
bvec[f].bv_page, bvec[f].bv_offset);
|
|
}
|
|
src_offs += CD_FRAMESIZE;
|
|
frames_write++;
|
|
}
|
|
}
|
|
pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
|
|
spin_unlock(&pkt->lock);
|
|
|
|
VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
|
|
frames_write, (unsigned long long)pkt->sector);
|
|
BUG_ON(frames_write != pkt->write_size);
|
|
|
|
if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
|
|
pkt_make_local_copy(pkt, bvec);
|
|
pkt->cache_valid = 1;
|
|
} else {
|
|
pkt->cache_valid = 0;
|
|
}
|
|
|
|
/* Start the write request */
|
|
bio_init(pkt->w_bio);
|
|
pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
|
|
pkt->w_bio->bi_sector = pkt->sector;
|
|
pkt->w_bio->bi_bdev = pd->bdev;
|
|
pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
|
|
pkt->w_bio->bi_private = pkt;
|
|
pkt->w_bio->bi_io_vec = bvec;
|
|
pkt->w_bio->bi_destructor = pkt_bio_destructor;
|
|
for (f = 0; f < pkt->frames; f++)
|
|
if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
|
|
BUG();
|
|
VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt);
|
|
|
|
atomic_set(&pkt->io_wait, 1);
|
|
pkt->w_bio->bi_rw = WRITE;
|
|
pkt_queue_bio(pd, pkt->w_bio);
|
|
}
|
|
|
|
static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
|
|
{
|
|
struct bio *bio, *next;
|
|
|
|
if (!uptodate)
|
|
pkt->cache_valid = 0;
|
|
|
|
/* Finish all bios corresponding to this packet */
|
|
bio = pkt->orig_bios;
|
|
while (bio) {
|
|
next = bio->bi_next;
|
|
bio->bi_next = NULL;
|
|
bio_endio(bio, uptodate ? 0 : -EIO);
|
|
bio = next;
|
|
}
|
|
pkt->orig_bios = pkt->orig_bios_tail = NULL;
|
|
}
|
|
|
|
static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
int uptodate;
|
|
|
|
VPRINTK("run_state_machine: pkt %d\n", pkt->id);
|
|
|
|
for (;;) {
|
|
switch (pkt->state) {
|
|
case PACKET_WAITING_STATE:
|
|
if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
|
|
return;
|
|
|
|
pkt->sleep_time = 0;
|
|
pkt_gather_data(pd, pkt);
|
|
pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
|
|
break;
|
|
|
|
case PACKET_READ_WAIT_STATE:
|
|
if (atomic_read(&pkt->io_wait) > 0)
|
|
return;
|
|
|
|
if (atomic_read(&pkt->io_errors) > 0) {
|
|
pkt_set_state(pkt, PACKET_RECOVERY_STATE);
|
|
} else {
|
|
pkt_start_write(pd, pkt);
|
|
}
|
|
break;
|
|
|
|
case PACKET_WRITE_WAIT_STATE:
|
|
if (atomic_read(&pkt->io_wait) > 0)
|
|
return;
|
|
|
|
if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
|
|
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 {
|
|
VPRINTK("No recovery possible\n");
|
|
pkt_set_state(pkt, PACKET_FINISHED_STATE);
|
|
}
|
|
break;
|
|
|
|
case PACKET_FINISHED_STATE:
|
|
uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
|
|
pkt_finish_packet(pkt, uptodate);
|
|
return;
|
|
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pkt_handle_packets(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_data *pkt, *next;
|
|
|
|
VPRINTK("pkt_handle_packets\n");
|
|
|
|
/*
|
|
* Run state machine for active packets
|
|
*/
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (atomic_read(&pkt->run_sm) > 0) {
|
|
atomic_set(&pkt->run_sm, 0);
|
|
pkt_run_state_machine(pd, pkt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Move no longer active packets to the free list
|
|
*/
|
|
spin_lock(&pd->cdrw.active_list_lock);
|
|
list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
|
|
if (pkt->state == PACKET_FINISHED_STATE) {
|
|
list_del(&pkt->list);
|
|
pkt_put_packet_data(pd, pkt);
|
|
pkt_set_state(pkt, PACKET_IDLE_STATE);
|
|
atomic_set(&pd->scan_queue, 1);
|
|
}
|
|
}
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
}
|
|
|
|
static void pkt_count_states(struct pktcdvd_device *pd, int *states)
|
|
{
|
|
struct packet_data *pkt;
|
|
int i;
|
|
|
|
for (i = 0; i < PACKET_NUM_STATES; i++)
|
|
states[i] = 0;
|
|
|
|
spin_lock(&pd->cdrw.active_list_lock);
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
states[pkt->state]++;
|
|
}
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
}
|
|
|
|
/*
|
|
* kcdrwd is woken up when writes have been queued for one of our
|
|
* registered devices
|
|
*/
|
|
static int kcdrwd(void *foobar)
|
|
{
|
|
struct pktcdvd_device *pd = foobar;
|
|
struct packet_data *pkt;
|
|
long min_sleep_time, residue;
|
|
|
|
set_user_nice(current, -20);
|
|
set_freezable();
|
|
|
|
for (;;) {
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
/*
|
|
* Wait until there is something to do
|
|
*/
|
|
add_wait_queue(&pd->wqueue, &wait);
|
|
for (;;) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
/* Check if we need to run pkt_handle_queue */
|
|
if (atomic_read(&pd->scan_queue) > 0)
|
|
goto work_to_do;
|
|
|
|
/* Check if we need to run the state machine for some packet */
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (atomic_read(&pkt->run_sm) > 0)
|
|
goto work_to_do;
|
|
}
|
|
|
|
/* Check if we need to process the iosched queues */
|
|
if (atomic_read(&pd->iosched.attention) != 0)
|
|
goto work_to_do;
|
|
|
|
/* Otherwise, go to sleep */
|
|
if (PACKET_DEBUG > 1) {
|
|
int states[PACKET_NUM_STATES];
|
|
pkt_count_states(pd, states);
|
|
VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
|
|
states[0], states[1], states[2], states[3],
|
|
states[4], states[5]);
|
|
}
|
|
|
|
min_sleep_time = MAX_SCHEDULE_TIMEOUT;
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
|
|
min_sleep_time = pkt->sleep_time;
|
|
}
|
|
|
|
generic_unplug_device(bdev_get_queue(pd->bdev));
|
|
|
|
VPRINTK("kcdrwd: sleeping\n");
|
|
residue = schedule_timeout(min_sleep_time);
|
|
VPRINTK("kcdrwd: wake up\n");
|
|
|
|
/* make swsusp happy with our thread */
|
|
try_to_freeze();
|
|
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (!pkt->sleep_time)
|
|
continue;
|
|
pkt->sleep_time -= min_sleep_time - residue;
|
|
if (pkt->sleep_time <= 0) {
|
|
pkt->sleep_time = 0;
|
|
atomic_inc(&pkt->run_sm);
|
|
}
|
|
}
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
}
|
|
work_to_do:
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&pd->wqueue, &wait);
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
/*
|
|
* if pkt_handle_queue returns true, we can queue
|
|
* another request.
|
|
*/
|
|
while (pkt_handle_queue(pd))
|
|
;
|
|
|
|
/*
|
|
* Handle packet state machine
|
|
*/
|
|
pkt_handle_packets(pd);
|
|
|
|
/*
|
|
* Handle iosched queues
|
|
*/
|
|
pkt_iosched_process_queue(pd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pkt_print_settings(struct pktcdvd_device *pd)
|
|
{
|
|
printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
|
|
printk("%u blocks, ", pd->settings.size >> 2);
|
|
printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
|
|
}
|
|
|
|
static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
|
|
{
|
|
memset(cgc->cmd, 0, sizeof(cgc->cmd));
|
|
|
|
cgc->cmd[0] = GPCMD_MODE_SENSE_10;
|
|
cgc->cmd[2] = page_code | (page_control << 6);
|
|
cgc->cmd[7] = cgc->buflen >> 8;
|
|
cgc->cmd[8] = cgc->buflen & 0xff;
|
|
cgc->data_direction = CGC_DATA_READ;
|
|
return pkt_generic_packet(pd, cgc);
|
|
}
|
|
|
|
static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
|
|
{
|
|
memset(cgc->cmd, 0, sizeof(cgc->cmd));
|
|
memset(cgc->buffer, 0, 2);
|
|
cgc->cmd[0] = GPCMD_MODE_SELECT_10;
|
|
cgc->cmd[1] = 0x10; /* PF */
|
|
cgc->cmd[7] = cgc->buflen >> 8;
|
|
cgc->cmd[8] = cgc->buflen & 0xff;
|
|
cgc->data_direction = CGC_DATA_WRITE;
|
|
return pkt_generic_packet(pd, cgc);
|
|
}
|
|
|
|
static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
|
|
{
|
|
struct packet_command cgc;
|
|
int ret;
|
|
|
|
/* set up command and get the disc info */
|
|
init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
|
|
cgc.cmd[0] = GPCMD_READ_DISC_INFO;
|
|
cgc.cmd[8] = cgc.buflen = 2;
|
|
cgc.quiet = 1;
|
|
|
|
if ((ret = pkt_generic_packet(pd, &cgc)))
|
|
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;
|
|
|
|
if ((ret = pkt_generic_packet(pd, &cgc)))
|
|
return ret;
|
|
|
|
cgc.buflen = be16_to_cpu(ti->track_information_length) +
|
|
sizeof(ti->track_information_length);
|
|
|
|
if (cgc.buflen > sizeof(track_information))
|
|
cgc.buflen = sizeof(track_information);
|
|
|
|
cgc.cmd[8] = cgc.buflen;
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
|
|
long *last_written)
|
|
{
|
|
disc_information di;
|
|
track_information ti;
|
|
__u32 last_track;
|
|
int ret = -1;
|
|
|
|
if ((ret = pkt_get_disc_info(pd, &di)))
|
|
return ret;
|
|
|
|
last_track = (di.last_track_msb << 8) | di.last_track_lsb;
|
|
if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
|
|
return ret;
|
|
|
|
/* if this track is blank, try the previous. */
|
|
if (ti.blank) {
|
|
last_track--;
|
|
if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
|
|
return ret;
|
|
}
|
|
|
|
/* if last recorded field is valid, return it. */
|
|
if (ti.lra_v) {
|
|
*last_written = be32_to_cpu(ti.last_rec_address);
|
|
} else {
|
|
/* make it up instead */
|
|
*last_written = be32_to_cpu(ti.track_start) +
|
|
be32_to_cpu(ti.track_size);
|
|
if (ti.free_blocks)
|
|
*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* write mode select package based on pd->settings
|
|
*/
|
|
static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_command cgc;
|
|
struct 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;
|
|
if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
|
|
size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
|
|
pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
|
|
if (size > sizeof(buffer))
|
|
size = sizeof(buffer);
|
|
|
|
/*
|
|
* now get it all
|
|
*/
|
|
init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
|
|
cgc.sense = &sense;
|
|
if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* write page is offset header + block descriptor length
|
|
*/
|
|
wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
|
|
|
|
wp->fp = pd->settings.fp;
|
|
wp->track_mode = pd->settings.track_mode;
|
|
wp->write_type = pd->settings.write_type;
|
|
wp->data_block_type = pd->settings.block_mode;
|
|
|
|
wp->multi_session = 0;
|
|
|
|
#ifdef PACKET_USE_LS
|
|
wp->link_size = 7;
|
|
wp->ls_v = 1;
|
|
#endif
|
|
|
|
if (wp->data_block_type == PACKET_BLOCK_MODE1) {
|
|
wp->session_format = 0;
|
|
wp->subhdr2 = 0x20;
|
|
} else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
|
|
wp->session_format = 0x20;
|
|
wp->subhdr2 = 8;
|
|
#if 0
|
|
wp->mcn[0] = 0x80;
|
|
memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
|
|
#endif
|
|
} else {
|
|
/*
|
|
* paranoia
|
|
*/
|
|
printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type);
|
|
return 1;
|
|
}
|
|
wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
|
|
|
|
cgc.buflen = cgc.cmd[8] = size;
|
|
if ((ret = pkt_mode_select(pd, &cgc))) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
|
|
pkt_print_settings(pd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 1 -- we can write to this track, 0 -- we can't
|
|
*/
|
|
static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
|
|
{
|
|
switch (pd->mmc3_profile) {
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x12: /* DVD-RAM */
|
|
/* The track is always writable on DVD+RW/DVD-RAM */
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!ti->packet || !ti->fp)
|
|
return 0;
|
|
|
|
/*
|
|
* "good" settings as per Mt Fuji.
|
|
*/
|
|
if (ti->rt == 0 && ti->blank == 0)
|
|
return 1;
|
|
|
|
if (ti->rt == 0 && ti->blank == 1)
|
|
return 1;
|
|
|
|
if (ti->rt == 1 && ti->blank == 0)
|
|
return 1;
|
|
|
|
printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 1 -- we can write to this disc, 0 -- we can't
|
|
*/
|
|
static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
|
|
{
|
|
switch (pd->mmc3_profile) {
|
|
case 0x0a: /* CD-RW */
|
|
case 0xffff: /* MMC3 not supported */
|
|
break;
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x13: /* DVD-RW */
|
|
case 0x12: /* DVD-RAM */
|
|
return 1;
|
|
default:
|
|
VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* for disc type 0xff we should probably reserve a new track.
|
|
* but i'm not sure, should we leave this to user apps? probably.
|
|
*/
|
|
if (di->disc_type == 0xff) {
|
|
printk(DRIVER_NAME": Unknown disc. No track?\n");
|
|
return 0;
|
|
}
|
|
|
|
if (di->disc_type != 0x20 && di->disc_type != 0) {
|
|
printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type);
|
|
return 0;
|
|
}
|
|
|
|
if (di->erasable == 0) {
|
|
printk(DRIVER_NAME": Disc not erasable\n");
|
|
return 0;
|
|
}
|
|
|
|
if (di->border_status == PACKET_SESSION_RESERVED) {
|
|
printk(DRIVER_NAME": Can't write to last track (reserved)\n");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_command cgc;
|
|
unsigned char buf[12];
|
|
disc_information di;
|
|
track_information ti;
|
|
int ret, track;
|
|
|
|
init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
|
|
cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
|
|
cgc.cmd[8] = 8;
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
|
|
|
|
memset(&di, 0, sizeof(disc_information));
|
|
memset(&ti, 0, sizeof(track_information));
|
|
|
|
if ((ret = pkt_get_disc_info(pd, &di))) {
|
|
printk("failed get_disc\n");
|
|
return ret;
|
|
}
|
|
|
|
if (!pkt_writable_disc(pd, &di))
|
|
return -EROFS;
|
|
|
|
pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
|
|
|
|
track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
|
|
if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
|
|
printk(DRIVER_NAME": failed get_track\n");
|
|
return ret;
|
|
}
|
|
|
|
if (!pkt_writable_track(pd, &ti)) {
|
|
printk(DRIVER_NAME": can't write to this track\n");
|
|
return -EROFS;
|
|
}
|
|
|
|
/*
|
|
* we keep packet size in 512 byte units, makes it easier to
|
|
* deal with request calculations.
|
|
*/
|
|
pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
|
|
if (pd->settings.size == 0) {
|
|
printk(DRIVER_NAME": detected zero packet size!\n");
|
|
return -ENXIO;
|
|
}
|
|
if (pd->settings.size > PACKET_MAX_SECTORS) {
|
|
printk(DRIVER_NAME": packet size is too big\n");
|
|
return -EROFS;
|
|
}
|
|
pd->settings.fp = ti.fp;
|
|
pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
|
|
|
|
if (ti.nwa_v) {
|
|
pd->nwa = be32_to_cpu(ti.next_writable);
|
|
set_bit(PACKET_NWA_VALID, &pd->flags);
|
|
}
|
|
|
|
/*
|
|
* in theory we could use lra on -RW media as well and just zero
|
|
* blocks that haven't been written yet, but in practice that
|
|
* is just a no-go. we'll use that for -R, naturally.
|
|
*/
|
|
if (ti.lra_v) {
|
|
pd->lra = be32_to_cpu(ti.last_rec_address);
|
|
set_bit(PACKET_LRA_VALID, &pd->flags);
|
|
} else {
|
|
pd->lra = 0xffffffff;
|
|
set_bit(PACKET_LRA_VALID, &pd->flags);
|
|
}
|
|
|
|
/*
|
|
* fine for now
|
|
*/
|
|
pd->settings.link_loss = 7;
|
|
pd->settings.write_type = 0; /* packet */
|
|
pd->settings.track_mode = ti.track_mode;
|
|
|
|
/*
|
|
* mode1 or mode2 disc
|
|
*/
|
|
switch (ti.data_mode) {
|
|
case PACKET_MODE1:
|
|
pd->settings.block_mode = PACKET_BLOCK_MODE1;
|
|
break;
|
|
case PACKET_MODE2:
|
|
pd->settings.block_mode = PACKET_BLOCK_MODE2;
|
|
break;
|
|
default:
|
|
printk(DRIVER_NAME": unknown data mode\n");
|
|
return -EROFS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* enable/disable write caching on drive
|
|
*/
|
|
static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
|
|
int set)
|
|
{
|
|
struct packet_command cgc;
|
|
struct 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;
|
|
|
|
if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
|
|
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) {
|
|
printk(DRIVER_NAME": write caching control failed\n");
|
|
pkt_dump_sense(&cgc);
|
|
} else if (!ret && set)
|
|
printk(DRIVER_NAME": enabled write caching on %s\n", pd->name);
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
|
|
{
|
|
struct packet_command cgc;
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
|
|
cgc.cmd[4] = lockflag ? 1 : 0;
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
/*
|
|
* Returns drive maximum write speed
|
|
*/
|
|
static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
|
|
unsigned *write_speed)
|
|
{
|
|
struct packet_command cgc;
|
|
struct 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) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
offset = 20; /* Obsoleted field, used by older drives */
|
|
if (cap_buf[1] >= 28)
|
|
offset = 28; /* Current write speed selected */
|
|
if (cap_buf[1] >= 30) {
|
|
/* If the drive reports at least one "Logical Unit Write
|
|
* Speed Performance Descriptor Block", use the information
|
|
* in the first block. (contains the highest speed)
|
|
*/
|
|
int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
|
|
if (num_spdb > 0)
|
|
offset = 34;
|
|
}
|
|
|
|
*write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
|
|
return 0;
|
|
}
|
|
|
|
/* These tables from cdrecord - I don't have orange book */
|
|
/* standard speed CD-RW (1-4x) */
|
|
static char clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
/* high speed CD-RW (-10x) */
|
|
static char hs_clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
/* ultra high speed CD-RW */
|
|
static char us_clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
|
|
};
|
|
|
|
/*
|
|
* reads the maximum media speed from ATIP
|
|
*/
|
|
static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
|
|
unsigned *speed)
|
|
{
|
|
struct packet_command cgc;
|
|
struct 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) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
|
|
if (size > sizeof(buf))
|
|
size = sizeof(buf);
|
|
|
|
init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
|
|
cgc.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) {
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
|
|
if (!(buf[6] & 0x40)) {
|
|
printk(DRIVER_NAME": Disc type is not CD-RW\n");
|
|
return 1;
|
|
}
|
|
if (!(buf[6] & 0x4)) {
|
|
printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n");
|
|
return 1;
|
|
}
|
|
|
|
st = (buf[6] >> 3) & 0x7; /* disc sub-type */
|
|
|
|
sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
|
|
|
|
/* Info from cdrecord */
|
|
switch (st) {
|
|
case 0: /* standard speed */
|
|
*speed = clv_to_speed[sp];
|
|
break;
|
|
case 1: /* high speed */
|
|
*speed = hs_clv_to_speed[sp];
|
|
break;
|
|
case 2: /* ultra high speed */
|
|
*speed = us_clv_to_speed[sp];
|
|
break;
|
|
default:
|
|
printk(DRIVER_NAME": Unknown disc sub-type %d\n",st);
|
|
return 1;
|
|
}
|
|
if (*speed) {
|
|
printk(DRIVER_NAME": Max. media speed: %d\n",*speed);
|
|
return 0;
|
|
} else {
|
|
printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_command cgc;
|
|
struct request_sense sense;
|
|
int ret;
|
|
|
|
VPRINTK(DRIVER_NAME": Performing OPC\n");
|
|
|
|
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;
|
|
if ((ret = pkt_generic_packet(pd, &cgc)))
|
|
pkt_dump_sense(&cgc);
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_open_write(struct pktcdvd_device *pd)
|
|
{
|
|
int ret;
|
|
unsigned int write_speed, media_write_speed, read_speed;
|
|
|
|
if ((ret = pkt_probe_settings(pd))) {
|
|
VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name);
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = pkt_set_write_settings(pd))) {
|
|
DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name);
|
|
return -EIO;
|
|
}
|
|
|
|
pkt_write_caching(pd, USE_WCACHING);
|
|
|
|
if ((ret = pkt_get_max_speed(pd, &write_speed)))
|
|
write_speed = 16 * 177;
|
|
switch (pd->mmc3_profile) {
|
|
case 0x13: /* DVD-RW */
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x12: /* DVD-RAM */
|
|
DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed);
|
|
break;
|
|
default:
|
|
if ((ret = pkt_media_speed(pd, &media_write_speed)))
|
|
media_write_speed = 16;
|
|
write_speed = min(write_speed, media_write_speed * 177);
|
|
DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176);
|
|
break;
|
|
}
|
|
read_speed = write_speed;
|
|
|
|
if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
|
|
DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name);
|
|
return -EIO;
|
|
}
|
|
pd->write_speed = write_speed;
|
|
pd->read_speed = read_speed;
|
|
|
|
if ((ret = pkt_perform_opc(pd))) {
|
|
DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* called at open time.
|
|
*/
|
|
static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
|
|
{
|
|
int ret;
|
|
long lba;
|
|
struct request_queue *q;
|
|
|
|
/*
|
|
* 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);
|
|
if ((ret = blkdev_get(pd->bdev, FMODE_READ)))
|
|
goto out;
|
|
|
|
if ((ret = bd_claim(pd->bdev, pd)))
|
|
goto out_putdev;
|
|
|
|
if ((ret = pkt_get_last_written(pd, &lba))) {
|
|
printk(DRIVER_NAME": pkt_get_last_written failed\n");
|
|
goto out_unclaim;
|
|
}
|
|
|
|
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) {
|
|
if ((ret = pkt_open_write(pd)))
|
|
goto out_unclaim;
|
|
/*
|
|
* 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);
|
|
blk_queue_max_sectors(q, pd->settings.size);
|
|
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);
|
|
}
|
|
|
|
if ((ret = pkt_set_segment_merging(pd, q)))
|
|
goto out_unclaim;
|
|
|
|
if (write) {
|
|
if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
|
|
printk(DRIVER_NAME": not enough memory for buffers\n");
|
|
ret = -ENOMEM;
|
|
goto out_unclaim;
|
|
}
|
|
printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unclaim:
|
|
bd_release(pd->bdev);
|
|
out_putdev:
|
|
blkdev_put(pd->bdev, FMODE_READ);
|
|
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))
|
|
DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name);
|
|
|
|
pkt_lock_door(pd, 0);
|
|
|
|
pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
|
|
bd_release(pd->bdev);
|
|
blkdev_put(pd->bdev, FMODE_READ);
|
|
|
|
pkt_shrink_pktlist(pd);
|
|
}
|
|
|
|
static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
|
|
{
|
|
if (dev_minor >= MAX_WRITERS)
|
|
return NULL;
|
|
return pkt_devs[dev_minor];
|
|
}
|
|
|
|
static int pkt_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct pktcdvd_device *pd = NULL;
|
|
int ret;
|
|
|
|
VPRINTK(DRIVER_NAME": entering open\n");
|
|
|
|
mutex_lock(&ctl_mutex);
|
|
pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
|
|
if (!pd) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
BUG_ON(pd->refcnt < 0);
|
|
|
|
pd->refcnt++;
|
|
if (pd->refcnt > 1) {
|
|
if ((mode & FMODE_WRITE) &&
|
|
!test_bit(PACKET_WRITABLE, &pd->flags)) {
|
|
ret = -EBUSY;
|
|
goto out_dec;
|
|
}
|
|
} else {
|
|
ret = pkt_open_dev(pd, mode & FMODE_WRITE);
|
|
if (ret)
|
|
goto out_dec;
|
|
/*
|
|
* needed here as well, since ext2 (among others) may change
|
|
* the blocksize at mount time
|
|
*/
|
|
set_blocksize(bdev, CD_FRAMESIZE);
|
|
}
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
return 0;
|
|
|
|
out_dec:
|
|
pd->refcnt--;
|
|
out:
|
|
VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
|
|
mutex_unlock(&ctl_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_close(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct pktcdvd_device *pd = disk->private_data;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ctl_mutex);
|
|
pd->refcnt--;
|
|
BUG_ON(pd->refcnt < 0);
|
|
if (pd->refcnt == 0) {
|
|
int flush = test_bit(PACKET_WRITABLE, &pd->flags);
|
|
pkt_release_dev(pd, flush);
|
|
}
|
|
mutex_unlock(&ctl_mutex);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void pkt_end_io_read_cloned(struct bio *bio, int err)
|
|
{
|
|
struct packet_stacked_data *psd = bio->bi_private;
|
|
struct pktcdvd_device *pd = psd->pd;
|
|
|
|
bio_put(bio);
|
|
bio_endio(psd->bio, err);
|
|
mempool_free(psd, psd_pool);
|
|
pkt_bio_finished(pd);
|
|
}
|
|
|
|
static int pkt_make_request(struct request_queue *q, struct bio *bio)
|
|
{
|
|
struct pktcdvd_device *pd;
|
|
char b[BDEVNAME_SIZE];
|
|
sector_t zone;
|
|
struct packet_data *pkt;
|
|
int was_empty, blocked_bio;
|
|
struct pkt_rb_node *node;
|
|
|
|
pd = q->queuedata;
|
|
if (!pd) {
|
|
printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
|
|
goto end_io;
|
|
}
|
|
|
|
/*
|
|
* Clone READ bios so we can have our own bi_end_io callback.
|
|
*/
|
|
if (bio_data_dir(bio) == READ) {
|
|
struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
|
|
struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
|
|
|
|
psd->pd = pd;
|
|
psd->bio = bio;
|
|
cloned_bio->bi_bdev = pd->bdev;
|
|
cloned_bio->bi_private = psd;
|
|
cloned_bio->bi_end_io = pkt_end_io_read_cloned;
|
|
pd->stats.secs_r += bio->bi_size >> 9;
|
|
pkt_queue_bio(pd, cloned_bio);
|
|
return 0;
|
|
}
|
|
|
|
if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
|
|
printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n",
|
|
pd->name, (unsigned long long)bio->bi_sector);
|
|
goto end_io;
|
|
}
|
|
|
|
if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
|
|
printk(DRIVER_NAME": wrong bio size\n");
|
|
goto end_io;
|
|
}
|
|
|
|
blk_queue_bounce(q, &bio);
|
|
|
|
zone = ZONE(bio->bi_sector, pd);
|
|
VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
|
|
(unsigned long long)bio->bi_sector,
|
|
(unsigned long long)(bio->bi_sector + bio_sectors(bio)));
|
|
|
|
/* Check if we have to split the bio */
|
|
{
|
|
struct bio_pair *bp;
|
|
sector_t last_zone;
|
|
int first_sectors;
|
|
|
|
last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
|
|
if (last_zone != zone) {
|
|
BUG_ON(last_zone != zone + pd->settings.size);
|
|
first_sectors = last_zone - bio->bi_sector;
|
|
bp = bio_split(bio, first_sectors);
|
|
BUG_ON(!bp);
|
|
pkt_make_request(q, &bp->bio1);
|
|
pkt_make_request(q, &bp->bio2);
|
|
bio_pair_release(bp);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)) {
|
|
pkt_add_list_last(bio, &pkt->orig_bios,
|
|
&pkt->orig_bios_tail);
|
|
pkt->write_size += bio->bi_size / CD_FRAMESIZE;
|
|
if ((pkt->write_size >= pkt->frames) &&
|
|
(pkt->state == PACKET_WAITING_STATE)) {
|
|
atomic_inc(&pkt->run_sm);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
return 0;
|
|
} else {
|
|
blocked_bio = 1;
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
}
|
|
}
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
|
|
/*
|
|
* Test if there is enough room left in the bio work queue
|
|
* (queue size >= congestion on mark).
|
|
* If not, wait till the work queue size is below the congestion off mark.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
if (pd->write_congestion_on > 0
|
|
&& pd->bio_queue_size >= pd->write_congestion_on) {
|
|
set_bdi_congested(&q->backing_dev_info, WRITE);
|
|
do {
|
|
spin_unlock(&pd->lock);
|
|
congestion_wait(WRITE, HZ);
|
|
spin_lock(&pd->lock);
|
|
} while(pd->bio_queue_size > pd->write_congestion_off);
|
|
}
|
|
spin_unlock(&pd->lock);
|
|
|
|
/*
|
|
* No matching packet found. Store the bio in the work queue.
|
|
*/
|
|
node = mempool_alloc(pd->rb_pool, GFP_NOIO);
|
|
node->bio = bio;
|
|
spin_lock(&pd->lock);
|
|
BUG_ON(pd->bio_queue_size < 0);
|
|
was_empty = (pd->bio_queue_size == 0);
|
|
pkt_rbtree_insert(pd, node);
|
|
spin_unlock(&pd->lock);
|
|
|
|
/*
|
|
* Wake up the worker thread.
|
|
*/
|
|
atomic_set(&pd->scan_queue, 1);
|
|
if (was_empty) {
|
|
/* This wake_up is required for correct operation */
|
|
wake_up(&pd->wqueue);
|
|
} else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
|
|
/*
|
|
* This wake up is not required for correct operation,
|
|
* but improves performance in some cases.
|
|
*/
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
return 0;
|
|
end_io:
|
|
bio_io_error(bio);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
|
|
struct bio_vec *bvec)
|
|
{
|
|
struct pktcdvd_device *pd = q->queuedata;
|
|
sector_t zone = ZONE(bmd->bi_sector, pd);
|
|
int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
|
|
int remaining = (pd->settings.size << 9) - used;
|
|
int remaining2;
|
|
|
|
/*
|
|
* A bio <= PAGE_SIZE must be allowed. If it crosses a packet
|
|
* boundary, pkt_make_request() will split the bio.
|
|
*/
|
|
remaining2 = PAGE_SIZE - bmd->bi_size;
|
|
remaining = max(remaining, remaining2);
|
|
|
|
BUG_ON(remaining < 0);
|
|
return remaining;
|
|
}
|
|
|
|
static void pkt_init_queue(struct pktcdvd_device *pd)
|
|
{
|
|
struct request_queue *q = pd->disk->queue;
|
|
|
|
blk_queue_make_request(q, pkt_make_request);
|
|
blk_queue_hardsect_size(q, CD_FRAMESIZE);
|
|
blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
|
|
blk_queue_merge_bvec(q, pkt_merge_bvec);
|
|
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]);
|
|
|
|
seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
|
|
pd->write_congestion_off,
|
|
pd->write_congestion_on);
|
|
return 0;
|
|
}
|
|
|
|
static int pkt_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pkt_seq_show, PDE(inode)->data);
|
|
}
|
|
|
|
static const struct file_operations pkt_proc_fops = {
|
|
.open = pkt_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release
|
|
};
|
|
|
|
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) {
|
|
printk(DRIVER_NAME": Recursive setup not allowed\n");
|
|
return -EBUSY;
|
|
}
|
|
for (i = 0; i < MAX_WRITERS; i++) {
|
|
struct pktcdvd_device *pd2 = pkt_devs[i];
|
|
if (!pd2)
|
|
continue;
|
|
if (pd2->bdev->bd_dev == dev) {
|
|
printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b));
|
|
return -EBUSY;
|
|
}
|
|
if (pd2->pkt_dev == dev) {
|
|
printk(DRIVER_NAME": Can't chain pktcdvd devices\n");
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
bdev = bdget(dev);
|
|
if (!bdev)
|
|
return -ENOMEM;
|
|
ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* 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)) {
|
|
printk(DRIVER_NAME": can't start kernel thread\n");
|
|
ret = -ENOMEM;
|
|
goto out_mem;
|
|
}
|
|
|
|
proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
|
|
DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
|
|
return 0;
|
|
|
|
out_mem:
|
|
blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
|
|
/* This is safe: open() is still holding a reference. */
|
|
module_put(THIS_MODULE);
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pktcdvd_device *pd = bdev->bd_disk->private_data;
|
|
|
|
VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd,
|
|
MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
|
|
|
|
switch (cmd) {
|
|
case CDROMEJECT:
|
|
/*
|
|
* The door gets locked when the device is opened, so we
|
|
* have to unlock it or else the eject command fails.
|
|
*/
|
|
if (pd->refcnt == 1)
|
|
pkt_lock_door(pd, 0);
|
|
/* fallthru */
|
|
/*
|
|
* 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:
|
|
return __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
|
|
|
|
default:
|
|
VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
|
|
return -ENOTTY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pkt_media_changed(struct gendisk *disk)
|
|
{
|
|
struct pktcdvd_device *pd = disk->private_data;
|
|
struct gendisk *attached_disk;
|
|
|
|
if (!pd)
|
|
return 0;
|
|
if (!pd->bdev)
|
|
return 0;
|
|
attached_disk = pd->bdev->bd_disk;
|
|
if (!attached_disk)
|
|
return 0;
|
|
return attached_disk->fops->media_changed(attached_disk);
|
|
}
|
|
|
|
static struct block_device_operations pktcdvd_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pkt_open,
|
|
.release = pkt_close,
|
|
.locked_ioctl = pkt_ioctl,
|
|
.media_changed = pkt_media_changed,
|
|
};
|
|
|
|
/*
|
|
* Set up mapping from pktcdvd device to CD-ROM device.
|
|
*/
|
|
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
|
|
{
|
|
int idx;
|
|
int ret = -ENOMEM;
|
|
struct pktcdvd_device *pd;
|
|
struct gendisk *disk;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
for (idx = 0; idx < MAX_WRITERS; idx++)
|
|
if (!pkt_devs[idx])
|
|
break;
|
|
if (idx == MAX_WRITERS) {
|
|
printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS);
|
|
ret = -EBUSY;
|
|
goto out_mutex;
|
|
}
|
|
|
|
pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
|
|
if (!pd)
|
|
goto out_mutex;
|
|
|
|
pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
|
|
sizeof(struct pkt_rb_node));
|
|
if (!pd->rb_pool)
|
|
goto out_mem;
|
|
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
|
|
spin_lock_init(&pd->cdrw.active_list_lock);
|
|
|
|
spin_lock_init(&pd->lock);
|
|
spin_lock_init(&pd->iosched.lock);
|
|
sprintf(pd->name, DRIVER_NAME"%d", idx);
|
|
init_waitqueue_head(&pd->wqueue);
|
|
pd->bio_queue = RB_ROOT;
|
|
|
|
pd->write_congestion_on = write_congestion_on;
|
|
pd->write_congestion_off = write_congestion_off;
|
|
|
|
disk = alloc_disk(1);
|
|
if (!disk)
|
|
goto out_mem;
|
|
pd->disk = disk;
|
|
disk->major = pktdev_major;
|
|
disk->first_minor = idx;
|
|
disk->fops = &pktcdvd_ops;
|
|
disk->flags = GENHD_FL_REMOVABLE;
|
|
strcpy(disk->disk_name, pd->name);
|
|
disk->private_data = pd;
|
|
disk->queue = blk_alloc_queue(GFP_KERNEL);
|
|
if (!disk->queue)
|
|
goto out_mem2;
|
|
|
|
pd->pkt_dev = MKDEV(pktdev_major, idx);
|
|
ret = pkt_new_dev(pd, dev);
|
|
if (ret)
|
|
goto out_new_dev;
|
|
|
|
add_disk(disk);
|
|
|
|
pkt_sysfs_dev_new(pd);
|
|
pkt_debugfs_dev_new(pd);
|
|
|
|
pkt_devs[idx] = pd;
|
|
if (pkt_dev)
|
|
*pkt_dev = pd->pkt_dev;
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
return 0;
|
|
|
|
out_new_dev:
|
|
blk_cleanup_queue(disk->queue);
|
|
out_mem2:
|
|
put_disk(disk);
|
|
out_mem:
|
|
if (pd->rb_pool)
|
|
mempool_destroy(pd->rb_pool);
|
|
kfree(pd);
|
|
out_mutex:
|
|
mutex_unlock(&ctl_mutex);
|
|
printk(DRIVER_NAME": setup of pktcdvd device failed\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Tear down mapping from pktcdvd device to CD-ROM device.
|
|
*/
|
|
static int pkt_remove_dev(dev_t pkt_dev)
|
|
{
|
|
struct pktcdvd_device *pd;
|
|
int idx;
|
|
int ret = 0;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
for (idx = 0; idx < MAX_WRITERS; idx++) {
|
|
pd = pkt_devs[idx];
|
|
if (pd && (pd->pkt_dev == pkt_dev))
|
|
break;
|
|
}
|
|
if (idx == MAX_WRITERS) {
|
|
DPRINTK(DRIVER_NAME": dev not setup\n");
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
if (pd->refcnt > 0) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
if (!IS_ERR(pd->cdrw.thread))
|
|
kthread_stop(pd->cdrw.thread);
|
|
|
|
pkt_devs[idx] = NULL;
|
|
|
|
pkt_debugfs_dev_remove(pd);
|
|
pkt_sysfs_dev_remove(pd);
|
|
|
|
blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
|
|
|
|
remove_proc_entry(pd->name, pkt_proc);
|
|
DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
|
|
|
|
del_gendisk(pd->disk);
|
|
blk_cleanup_queue(pd->disk->queue);
|
|
put_disk(pd->disk);
|
|
|
|
mempool_destroy(pd->rb_pool);
|
|
kfree(pd);
|
|
|
|
/* This is safe: open() is still holding a reference. */
|
|
module_put(THIS_MODULE);
|
|
|
|
out:
|
|
mutex_unlock(&ctl_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
|
|
{
|
|
struct pktcdvd_device *pd;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
|
|
if (pd) {
|
|
ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
|
|
ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
|
|
} else {
|
|
ctrl_cmd->dev = 0;
|
|
ctrl_cmd->pkt_dev = 0;
|
|
}
|
|
ctrl_cmd->num_devices = MAX_WRITERS;
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
}
|
|
|
|
static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
struct pkt_ctrl_command ctrl_cmd;
|
|
int ret = 0;
|
|
dev_t pkt_dev = 0;
|
|
|
|
if (cmd != PACKET_CTRL_CMD)
|
|
return -ENOTTY;
|
|
|
|
if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
|
|
return -EFAULT;
|
|
|
|
switch (ctrl_cmd.command) {
|
|
case PKT_CTRL_CMD_SETUP:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
|
|
ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
|
|
break;
|
|
case PKT_CTRL_CMD_TEARDOWN:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
|
|
break;
|
|
case PKT_CTRL_CMD_STATUS:
|
|
pkt_get_status(&ctrl_cmd);
|
|
break;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
|
|
if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
|
|
static const struct file_operations pkt_ctl_fops = {
|
|
.ioctl = pkt_ctl_ioctl,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct miscdevice pkt_misc = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = DRIVER_NAME,
|
|
.fops = &pkt_ctl_fops
|
|
};
|
|
|
|
static int __init pkt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
mutex_init(&ctl_mutex);
|
|
|
|
psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
|
|
sizeof(struct packet_stacked_data));
|
|
if (!psd_pool)
|
|
return -ENOMEM;
|
|
|
|
ret = register_blkdev(pktdev_major, DRIVER_NAME);
|
|
if (ret < 0) {
|
|
printk(DRIVER_NAME": Unable to register block device\n");
|
|
goto out2;
|
|
}
|
|
if (!pktdev_major)
|
|
pktdev_major = ret;
|
|
|
|
ret = pkt_sysfs_init();
|
|
if (ret)
|
|
goto out;
|
|
|
|
pkt_debugfs_init();
|
|
|
|
ret = misc_register(&pkt_misc);
|
|
if (ret) {
|
|
printk(DRIVER_NAME": Unable to register misc device\n");
|
|
goto out_misc;
|
|
}
|
|
|
|
pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
|
|
|
|
return 0;
|
|
|
|
out_misc:
|
|
pkt_debugfs_cleanup();
|
|
pkt_sysfs_cleanup();
|
|
out:
|
|
unregister_blkdev(pktdev_major, DRIVER_NAME);
|
|
out2:
|
|
mempool_destroy(psd_pool);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit pkt_exit(void)
|
|
{
|
|
remove_proc_entry("driver/"DRIVER_NAME, NULL);
|
|
misc_deregister(&pkt_misc);
|
|
|
|
pkt_debugfs_cleanup();
|
|
pkt_sysfs_cleanup();
|
|
|
|
unregister_blkdev(pktdev_major, DRIVER_NAME);
|
|
mempool_destroy(psd_pool);
|
|
}
|
|
|
|
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);
|