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